Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1 | /* |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 2 | * Performance events core code: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2008 Thomas Gleixner <tglx@linutronix.de> |
Ingo Molnar | e7e7ee2 | 2011-05-04 08:42:29 +0200 | [diff] [blame] | 5 | * Copyright (C) 2008-2011 Red Hat, Inc., Ingo Molnar |
Peter Zijlstra | 90eec10 | 2015-11-16 11:08:45 +0100 | [diff] [blame] | 6 | * Copyright (C) 2008-2011 Red Hat, Inc., Peter Zijlstra |
Al Viro | d36b691 | 2011-12-29 17:09:01 -0500 | [diff] [blame] | 7 | * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8 | * |
Ingo Molnar | 57c0c15 | 2009-09-21 12:20:38 +0200 | [diff] [blame] | 9 | * For licensing details see kernel-base/COPYING |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | #include <linux/fs.h> |
| 13 | #include <linux/mm.h> |
| 14 | #include <linux/cpu.h> |
| 15 | #include <linux/smp.h> |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 16 | #include <linux/idr.h> |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 17 | #include <linux/file.h> |
| 18 | #include <linux/poll.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 20 | #include <linux/hash.h> |
Frederic Weisbecker | 12351ef | 2013-04-20 15:48:22 +0200 | [diff] [blame] | 21 | #include <linux/tick.h> |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 22 | #include <linux/sysfs.h> |
| 23 | #include <linux/dcache.h> |
| 24 | #include <linux/percpu.h> |
| 25 | #include <linux/ptrace.h> |
Peter Zijlstra | c277443 | 2010-12-08 15:29:02 +0100 | [diff] [blame] | 26 | #include <linux/reboot.h> |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 27 | #include <linux/vmstat.h> |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 28 | #include <linux/device.h> |
Paul Gortmaker | 6e5fdee | 2011-05-26 16:00:52 -0400 | [diff] [blame] | 29 | #include <linux/export.h> |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 30 | #include <linux/vmalloc.h> |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 31 | #include <linux/hardirq.h> |
| 32 | #include <linux/rculist.h> |
| 33 | #include <linux/uaccess.h> |
| 34 | #include <linux/syscalls.h> |
| 35 | #include <linux/anon_inodes.h> |
| 36 | #include <linux/kernel_stat.h> |
Matt Fleming | 39bed6c | 2015-01-23 18:45:40 +0000 | [diff] [blame] | 37 | #include <linux/cgroup.h> |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 38 | #include <linux/perf_event.h> |
Steven Rostedt (Red Hat) | af658dc | 2015-04-29 14:36:05 -0400 | [diff] [blame] | 39 | #include <linux/trace_events.h> |
Jason Wessel | 3c502e7 | 2010-11-04 17:33:01 -0500 | [diff] [blame] | 40 | #include <linux/hw_breakpoint.h> |
Jiri Olsa | c5ebced | 2012-08-07 15:20:40 +0200 | [diff] [blame] | 41 | #include <linux/mm_types.h> |
Yan, Zheng | c464c76 | 2014-03-18 16:56:41 +0800 | [diff] [blame] | 42 | #include <linux/module.h> |
Peter Zijlstra | f972eb6 | 2014-05-19 15:13:47 -0400 | [diff] [blame] | 43 | #include <linux/mman.h> |
Pawel Moll | b3f2078 | 2014-06-13 16:03:32 +0100 | [diff] [blame] | 44 | #include <linux/compat.h> |
Alexei Starovoitov | 2541517 | 2015-03-25 12:49:20 -0700 | [diff] [blame] | 45 | #include <linux/bpf.h> |
| 46 | #include <linux/filter.h> |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 47 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 48 | #include "internal.h" |
| 49 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 50 | #include <asm/irq_regs.h> |
| 51 | |
Jiri Olsa | fadfe7b | 2014-08-01 14:33:02 +0200 | [diff] [blame] | 52 | static struct workqueue_struct *perf_wq; |
| 53 | |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 54 | typedef int (*remote_function_f)(void *); |
| 55 | |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 56 | struct remote_function_call { |
Ingo Molnar | e7e7ee2 | 2011-05-04 08:42:29 +0200 | [diff] [blame] | 57 | struct task_struct *p; |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 58 | remote_function_f func; |
Ingo Molnar | e7e7ee2 | 2011-05-04 08:42:29 +0200 | [diff] [blame] | 59 | void *info; |
| 60 | int ret; |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 61 | }; |
| 62 | |
| 63 | static void remote_function(void *data) |
| 64 | { |
| 65 | struct remote_function_call *tfc = data; |
| 66 | struct task_struct *p = tfc->p; |
| 67 | |
| 68 | if (p) { |
| 69 | tfc->ret = -EAGAIN; |
| 70 | if (task_cpu(p) != smp_processor_id() || !task_curr(p)) |
| 71 | return; |
| 72 | } |
| 73 | |
| 74 | tfc->ret = tfc->func(tfc->info); |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * task_function_call - call a function on the cpu on which a task runs |
| 79 | * @p: the task to evaluate |
| 80 | * @func: the function to be called |
| 81 | * @info: the function call argument |
| 82 | * |
| 83 | * Calls the function @func when the task is currently running. This might |
| 84 | * be on the current CPU, which just calls the function directly |
| 85 | * |
| 86 | * returns: @func return value, or |
| 87 | * -ESRCH - when the process isn't running |
| 88 | * -EAGAIN - when the process moved away |
| 89 | */ |
| 90 | static int |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 91 | task_function_call(struct task_struct *p, remote_function_f func, void *info) |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 92 | { |
| 93 | struct remote_function_call data = { |
Ingo Molnar | e7e7ee2 | 2011-05-04 08:42:29 +0200 | [diff] [blame] | 94 | .p = p, |
| 95 | .func = func, |
| 96 | .info = info, |
| 97 | .ret = -ESRCH, /* No such (running) process */ |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 98 | }; |
| 99 | |
| 100 | if (task_curr(p)) |
| 101 | smp_call_function_single(task_cpu(p), remote_function, &data, 1); |
| 102 | |
| 103 | return data.ret; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * cpu_function_call - call a function on the cpu |
| 108 | * @func: the function to be called |
| 109 | * @info: the function call argument |
| 110 | * |
| 111 | * Calls the function @func on the remote cpu. |
| 112 | * |
| 113 | * returns: @func return value or -ENXIO when the cpu is offline |
| 114 | */ |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 115 | static int cpu_function_call(int cpu, remote_function_f func, void *info) |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 116 | { |
| 117 | struct remote_function_call data = { |
Ingo Molnar | e7e7ee2 | 2011-05-04 08:42:29 +0200 | [diff] [blame] | 118 | .p = NULL, |
| 119 | .func = func, |
| 120 | .info = info, |
| 121 | .ret = -ENXIO, /* No such CPU */ |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 122 | }; |
| 123 | |
| 124 | smp_call_function_single(cpu, remote_function, &data, 1); |
| 125 | |
| 126 | return data.ret; |
| 127 | } |
| 128 | |
Peter Zijlstra | 39a4364 | 2016-01-11 12:46:35 +0100 | [diff] [blame^] | 129 | /* |
| 130 | * On task ctx scheduling... |
| 131 | * |
| 132 | * When !ctx->nr_events a task context will not be scheduled. This means |
| 133 | * we can disable the scheduler hooks (for performance) without leaving |
| 134 | * pending task ctx state. |
| 135 | * |
| 136 | * This however results in two special cases: |
| 137 | * |
| 138 | * - removing the last event from a task ctx; this is relatively straight |
| 139 | * forward and is done in __perf_remove_from_context. |
| 140 | * |
| 141 | * - adding the first event to a task ctx; this is tricky because we cannot |
| 142 | * rely on ctx->is_active and therefore cannot use event_function_call(). |
| 143 | * See perf_install_in_context(). |
| 144 | * |
| 145 | * This is because we need a ctx->lock serialized variable (ctx->is_active) |
| 146 | * to reliably determine if a particular task/context is scheduled in. The |
| 147 | * task_curr() use in task_function_call() is racy in that a remote context |
| 148 | * switch is not a single atomic operation. |
| 149 | * |
| 150 | * As is, the situation is 'safe' because we set rq->curr before we do the |
| 151 | * actual context switch. This means that task_curr() will fail early, but |
| 152 | * we'll continue spinning on ctx->is_active until we've passed |
| 153 | * perf_event_task_sched_out(). |
| 154 | * |
| 155 | * Without this ctx->lock serialized variable we could have race where we find |
| 156 | * the task (and hence the context) would not be active while in fact they are. |
| 157 | * |
| 158 | * If ctx->nr_events, then ctx->is_active and cpuctx->task_ctx are set. |
| 159 | */ |
| 160 | |
Peter Zijlstra | 0017960 | 2015-11-30 16:26:35 +0100 | [diff] [blame] | 161 | static void event_function_call(struct perf_event *event, |
| 162 | int (*active)(void *), |
| 163 | void (*inactive)(void *), |
| 164 | void *data) |
| 165 | { |
| 166 | struct perf_event_context *ctx = event->ctx; |
| 167 | struct task_struct *task = ctx->task; |
| 168 | |
| 169 | if (!task) { |
| 170 | cpu_function_call(event->cpu, active, data); |
| 171 | return; |
| 172 | } |
| 173 | |
| 174 | again: |
| 175 | if (!task_function_call(task, active, data)) |
| 176 | return; |
| 177 | |
| 178 | raw_spin_lock_irq(&ctx->lock); |
| 179 | if (ctx->is_active) { |
| 180 | /* |
| 181 | * Reload the task pointer, it might have been changed by |
| 182 | * a concurrent perf_event_context_sched_out(). |
| 183 | */ |
| 184 | task = ctx->task; |
| 185 | raw_spin_unlock_irq(&ctx->lock); |
| 186 | goto again; |
| 187 | } |
| 188 | inactive(data); |
| 189 | raw_spin_unlock_irq(&ctx->lock); |
| 190 | } |
| 191 | |
Jiri Olsa | f869776 | 2014-08-01 14:33:01 +0200 | [diff] [blame] | 192 | #define EVENT_OWNER_KERNEL ((void *) -1) |
| 193 | |
| 194 | static bool is_kernel_event(struct perf_event *event) |
| 195 | { |
| 196 | return event->owner == EVENT_OWNER_KERNEL; |
| 197 | } |
| 198 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 199 | #define PERF_FLAG_ALL (PERF_FLAG_FD_NO_GROUP |\ |
| 200 | PERF_FLAG_FD_OUTPUT |\ |
Yann Droneaud | a21b0b3 | 2014-01-05 21:36:33 +0100 | [diff] [blame] | 201 | PERF_FLAG_PID_CGROUP |\ |
| 202 | PERF_FLAG_FD_CLOEXEC) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 203 | |
Stephane Eranian | bce38cd | 2012-02-09 23:20:51 +0100 | [diff] [blame] | 204 | /* |
| 205 | * branch priv levels that need permission checks |
| 206 | */ |
| 207 | #define PERF_SAMPLE_BRANCH_PERM_PLM \ |
| 208 | (PERF_SAMPLE_BRANCH_KERNEL |\ |
| 209 | PERF_SAMPLE_BRANCH_HV) |
| 210 | |
Stephane Eranian | 0b3fcf1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 211 | enum event_type_t { |
| 212 | EVENT_FLEXIBLE = 0x1, |
| 213 | EVENT_PINNED = 0x2, |
| 214 | EVENT_ALL = EVENT_FLEXIBLE | EVENT_PINNED, |
| 215 | }; |
| 216 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 217 | /* |
| 218 | * perf_sched_events : >0 events exist |
| 219 | * perf_cgroup_events: >0 per-cpu cgroup events exist on this cpu |
| 220 | */ |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 221 | struct static_key_deferred perf_sched_events __read_mostly; |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 222 | static DEFINE_PER_CPU(atomic_t, perf_cgroup_events); |
Yan, Zheng | ba53250 | 2014-11-04 21:55:58 -0500 | [diff] [blame] | 223 | static DEFINE_PER_CPU(int, perf_sched_cb_usages); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 224 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 225 | static atomic_t nr_mmap_events __read_mostly; |
| 226 | static atomic_t nr_comm_events __read_mostly; |
| 227 | static atomic_t nr_task_events __read_mostly; |
Frederic Weisbecker | 948b26b | 2013-08-02 18:29:55 +0200 | [diff] [blame] | 228 | static atomic_t nr_freq_events __read_mostly; |
Adrian Hunter | 45ac140 | 2015-07-21 12:44:02 +0300 | [diff] [blame] | 229 | static atomic_t nr_switch_events __read_mostly; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 230 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 231 | static LIST_HEAD(pmus); |
| 232 | static DEFINE_MUTEX(pmus_lock); |
| 233 | static struct srcu_struct pmus_srcu; |
| 234 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 235 | /* |
| 236 | * perf event paranoia level: |
| 237 | * -1 - not paranoid at all |
| 238 | * 0 - disallow raw tracepoint access for unpriv |
| 239 | * 1 - disallow cpu events for unpriv |
| 240 | * 2 - disallow kernel profiling for unpriv |
| 241 | */ |
| 242 | int sysctl_perf_event_paranoid __read_mostly = 1; |
| 243 | |
Frederic Weisbecker | 2044338 | 2011-03-31 03:33:29 +0200 | [diff] [blame] | 244 | /* Minimum for 512 kiB + 1 user control page */ |
| 245 | int sysctl_perf_event_mlock __read_mostly = 512 + (PAGE_SIZE / 1024); /* 'free' kiB per user */ |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 246 | |
| 247 | /* |
| 248 | * max perf event sample rate |
| 249 | */ |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 250 | #define DEFAULT_MAX_SAMPLE_RATE 100000 |
| 251 | #define DEFAULT_SAMPLE_PERIOD_NS (NSEC_PER_SEC / DEFAULT_MAX_SAMPLE_RATE) |
| 252 | #define DEFAULT_CPU_TIME_MAX_PERCENT 25 |
| 253 | |
| 254 | int sysctl_perf_event_sample_rate __read_mostly = DEFAULT_MAX_SAMPLE_RATE; |
| 255 | |
| 256 | static int max_samples_per_tick __read_mostly = DIV_ROUND_UP(DEFAULT_MAX_SAMPLE_RATE, HZ); |
| 257 | static int perf_sample_period_ns __read_mostly = DEFAULT_SAMPLE_PERIOD_NS; |
| 258 | |
Peter Zijlstra | d9494cb | 2013-10-17 15:36:19 +0200 | [diff] [blame] | 259 | static int perf_sample_allowed_ns __read_mostly = |
| 260 | DEFAULT_SAMPLE_PERIOD_NS * DEFAULT_CPU_TIME_MAX_PERCENT / 100; |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 261 | |
Geliang Tang | 18ab2cd | 2015-09-27 23:25:50 +0800 | [diff] [blame] | 262 | static void update_perf_cpu_limits(void) |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 263 | { |
| 264 | u64 tmp = perf_sample_period_ns; |
| 265 | |
| 266 | tmp *= sysctl_perf_cpu_time_max_percent; |
Stephane Eranian | e530292 | 2013-07-05 00:30:11 +0200 | [diff] [blame] | 267 | do_div(tmp, 100); |
Peter Zijlstra | d9494cb | 2013-10-17 15:36:19 +0200 | [diff] [blame] | 268 | ACCESS_ONCE(perf_sample_allowed_ns) = tmp; |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 269 | } |
Peter Zijlstra | 163ec43 | 2011-02-16 11:22:34 +0100 | [diff] [blame] | 270 | |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 271 | static int perf_rotate_context(struct perf_cpu_context *cpuctx); |
| 272 | |
Peter Zijlstra | 163ec43 | 2011-02-16 11:22:34 +0100 | [diff] [blame] | 273 | int perf_proc_update_handler(struct ctl_table *table, int write, |
| 274 | void __user *buffer, size_t *lenp, |
| 275 | loff_t *ppos) |
| 276 | { |
Knut Petersen | 723478c | 2013-09-25 14:29:37 +0200 | [diff] [blame] | 277 | int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); |
Peter Zijlstra | 163ec43 | 2011-02-16 11:22:34 +0100 | [diff] [blame] | 278 | |
| 279 | if (ret || !write) |
| 280 | return ret; |
| 281 | |
| 282 | max_samples_per_tick = DIV_ROUND_UP(sysctl_perf_event_sample_rate, HZ); |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 283 | perf_sample_period_ns = NSEC_PER_SEC / sysctl_perf_event_sample_rate; |
| 284 | update_perf_cpu_limits(); |
Peter Zijlstra | 163ec43 | 2011-02-16 11:22:34 +0100 | [diff] [blame] | 285 | |
| 286 | return 0; |
| 287 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 288 | |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 289 | int sysctl_perf_cpu_time_max_percent __read_mostly = DEFAULT_CPU_TIME_MAX_PERCENT; |
| 290 | |
| 291 | int perf_cpu_time_max_percent_handler(struct ctl_table *table, int write, |
| 292 | void __user *buffer, size_t *lenp, |
| 293 | loff_t *ppos) |
| 294 | { |
| 295 | int ret = proc_dointvec(table, write, buffer, lenp, ppos); |
| 296 | |
| 297 | if (ret || !write) |
| 298 | return ret; |
| 299 | |
| 300 | update_perf_cpu_limits(); |
| 301 | |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | /* |
| 306 | * perf samples are done in some very critical code paths (NMIs). |
| 307 | * If they take too much CPU time, the system can lock up and not |
| 308 | * get any real work done. This will drop the sample rate when |
| 309 | * we detect that events are taking too long. |
| 310 | */ |
| 311 | #define NR_ACCUMULATED_SAMPLES 128 |
Peter Zijlstra | d9494cb | 2013-10-17 15:36:19 +0200 | [diff] [blame] | 312 | static DEFINE_PER_CPU(u64, running_sample_length); |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 313 | |
Peter Zijlstra | 6a02ad66 | 2014-02-03 18:11:08 +0100 | [diff] [blame] | 314 | static void perf_duration_warn(struct irq_work *w) |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 315 | { |
Peter Zijlstra | 6a02ad66 | 2014-02-03 18:11:08 +0100 | [diff] [blame] | 316 | u64 allowed_ns = ACCESS_ONCE(perf_sample_allowed_ns); |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 317 | u64 avg_local_sample_len; |
Stephane Eranian | e530292 | 2013-07-05 00:30:11 +0200 | [diff] [blame] | 318 | u64 local_samples_len; |
Peter Zijlstra | 6a02ad66 | 2014-02-03 18:11:08 +0100 | [diff] [blame] | 319 | |
Christoph Lameter | 4a32fea | 2014-08-17 12:30:27 -0500 | [diff] [blame] | 320 | local_samples_len = __this_cpu_read(running_sample_length); |
Peter Zijlstra | 6a02ad66 | 2014-02-03 18:11:08 +0100 | [diff] [blame] | 321 | avg_local_sample_len = local_samples_len/NR_ACCUMULATED_SAMPLES; |
| 322 | |
| 323 | printk_ratelimited(KERN_WARNING |
| 324 | "perf interrupt took too long (%lld > %lld), lowering " |
| 325 | "kernel.perf_event_max_sample_rate to %d\n", |
Peter Zijlstra | cd578ab | 2014-02-11 16:01:16 +0100 | [diff] [blame] | 326 | avg_local_sample_len, allowed_ns >> 1, |
Peter Zijlstra | 6a02ad66 | 2014-02-03 18:11:08 +0100 | [diff] [blame] | 327 | sysctl_perf_event_sample_rate); |
| 328 | } |
| 329 | |
| 330 | static DEFINE_IRQ_WORK(perf_duration_work, perf_duration_warn); |
| 331 | |
| 332 | void perf_sample_event_took(u64 sample_len_ns) |
| 333 | { |
Peter Zijlstra | d9494cb | 2013-10-17 15:36:19 +0200 | [diff] [blame] | 334 | u64 allowed_ns = ACCESS_ONCE(perf_sample_allowed_ns); |
Peter Zijlstra | 6a02ad66 | 2014-02-03 18:11:08 +0100 | [diff] [blame] | 335 | u64 avg_local_sample_len; |
| 336 | u64 local_samples_len; |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 337 | |
Peter Zijlstra | d9494cb | 2013-10-17 15:36:19 +0200 | [diff] [blame] | 338 | if (allowed_ns == 0) |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 339 | return; |
| 340 | |
| 341 | /* decay the counter by 1 average sample */ |
Christoph Lameter | 4a32fea | 2014-08-17 12:30:27 -0500 | [diff] [blame] | 342 | local_samples_len = __this_cpu_read(running_sample_length); |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 343 | local_samples_len -= local_samples_len/NR_ACCUMULATED_SAMPLES; |
| 344 | local_samples_len += sample_len_ns; |
Christoph Lameter | 4a32fea | 2014-08-17 12:30:27 -0500 | [diff] [blame] | 345 | __this_cpu_write(running_sample_length, local_samples_len); |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 346 | |
| 347 | /* |
| 348 | * note: this will be biased artifically low until we have |
| 349 | * seen NR_ACCUMULATED_SAMPLES. Doing it this way keeps us |
| 350 | * from having to maintain a count. |
| 351 | */ |
| 352 | avg_local_sample_len = local_samples_len/NR_ACCUMULATED_SAMPLES; |
| 353 | |
Peter Zijlstra | d9494cb | 2013-10-17 15:36:19 +0200 | [diff] [blame] | 354 | if (avg_local_sample_len <= allowed_ns) |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 355 | return; |
| 356 | |
| 357 | if (max_samples_per_tick <= 1) |
| 358 | return; |
| 359 | |
| 360 | max_samples_per_tick = DIV_ROUND_UP(max_samples_per_tick, 2); |
| 361 | sysctl_perf_event_sample_rate = max_samples_per_tick * HZ; |
| 362 | perf_sample_period_ns = NSEC_PER_SEC / sysctl_perf_event_sample_rate; |
| 363 | |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 364 | update_perf_cpu_limits(); |
Peter Zijlstra | 6a02ad66 | 2014-02-03 18:11:08 +0100 | [diff] [blame] | 365 | |
Peter Zijlstra | cd578ab | 2014-02-11 16:01:16 +0100 | [diff] [blame] | 366 | if (!irq_work_queue(&perf_duration_work)) { |
| 367 | early_printk("perf interrupt took too long (%lld > %lld), lowering " |
| 368 | "kernel.perf_event_max_sample_rate to %d\n", |
| 369 | avg_local_sample_len, allowed_ns >> 1, |
| 370 | sysctl_perf_event_sample_rate); |
| 371 | } |
Dave Hansen | 14c63f1 | 2013-06-21 08:51:36 -0700 | [diff] [blame] | 372 | } |
| 373 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 374 | static atomic64_t perf_event_id; |
| 375 | |
Stephane Eranian | 0b3fcf1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 376 | static void cpu_ctx_sched_out(struct perf_cpu_context *cpuctx, |
| 377 | enum event_type_t event_type); |
| 378 | |
| 379 | static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx, |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 380 | enum event_type_t event_type, |
| 381 | struct task_struct *task); |
| 382 | |
| 383 | static void update_context_time(struct perf_event_context *ctx); |
| 384 | static u64 perf_event_time(struct perf_event *event); |
Stephane Eranian | 0b3fcf1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 385 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 386 | void __weak perf_event_print_debug(void) { } |
| 387 | |
Matt Fleming | 84c7991 | 2010-10-03 21:41:13 +0100 | [diff] [blame] | 388 | extern __weak const char *perf_pmu_name(void) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 389 | { |
Matt Fleming | 84c7991 | 2010-10-03 21:41:13 +0100 | [diff] [blame] | 390 | return "pmu"; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 391 | } |
| 392 | |
Stephane Eranian | 0b3fcf1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 393 | static inline u64 perf_clock(void) |
| 394 | { |
| 395 | return local_clock(); |
| 396 | } |
| 397 | |
Peter Zijlstra | 34f4392 | 2015-02-20 14:05:38 +0100 | [diff] [blame] | 398 | static inline u64 perf_event_clock(struct perf_event *event) |
| 399 | { |
| 400 | return event->clock(); |
| 401 | } |
| 402 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 403 | static inline struct perf_cpu_context * |
| 404 | __get_cpu_context(struct perf_event_context *ctx) |
| 405 | { |
| 406 | return this_cpu_ptr(ctx->pmu->pmu_cpu_context); |
| 407 | } |
| 408 | |
Peter Zijlstra | facc430 | 2011-04-09 21:17:42 +0200 | [diff] [blame] | 409 | static void perf_ctx_lock(struct perf_cpu_context *cpuctx, |
| 410 | struct perf_event_context *ctx) |
| 411 | { |
| 412 | raw_spin_lock(&cpuctx->ctx.lock); |
| 413 | if (ctx) |
| 414 | raw_spin_lock(&ctx->lock); |
| 415 | } |
| 416 | |
| 417 | static void perf_ctx_unlock(struct perf_cpu_context *cpuctx, |
| 418 | struct perf_event_context *ctx) |
| 419 | { |
| 420 | if (ctx) |
| 421 | raw_spin_unlock(&ctx->lock); |
| 422 | raw_spin_unlock(&cpuctx->ctx.lock); |
| 423 | } |
| 424 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 425 | #ifdef CONFIG_CGROUP_PERF |
| 426 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 427 | static inline bool |
| 428 | perf_cgroup_match(struct perf_event *event) |
| 429 | { |
| 430 | struct perf_event_context *ctx = event->ctx; |
| 431 | struct perf_cpu_context *cpuctx = __get_cpu_context(ctx); |
| 432 | |
Tejun Heo | ef824fa | 2013-04-08 19:00:38 -0700 | [diff] [blame] | 433 | /* @event doesn't care about cgroup */ |
| 434 | if (!event->cgrp) |
| 435 | return true; |
| 436 | |
| 437 | /* wants specific cgroup scope but @cpuctx isn't associated with any */ |
| 438 | if (!cpuctx->cgrp) |
| 439 | return false; |
| 440 | |
| 441 | /* |
| 442 | * Cgroup scoping is recursive. An event enabled for a cgroup is |
| 443 | * also enabled for all its descendant cgroups. If @cpuctx's |
| 444 | * cgroup is a descendant of @event's (the test covers identity |
| 445 | * case), it's a match. |
| 446 | */ |
| 447 | return cgroup_is_descendant(cpuctx->cgrp->css.cgroup, |
| 448 | event->cgrp->css.cgroup); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 449 | } |
| 450 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 451 | static inline void perf_detach_cgroup(struct perf_event *event) |
| 452 | { |
Zefan Li | 4e2ba65 | 2014-09-19 16:53:14 +0800 | [diff] [blame] | 453 | css_put(&event->cgrp->css); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 454 | event->cgrp = NULL; |
| 455 | } |
| 456 | |
| 457 | static inline int is_cgroup_event(struct perf_event *event) |
| 458 | { |
| 459 | return event->cgrp != NULL; |
| 460 | } |
| 461 | |
| 462 | static inline u64 perf_cgroup_event_time(struct perf_event *event) |
| 463 | { |
| 464 | struct perf_cgroup_info *t; |
| 465 | |
| 466 | t = per_cpu_ptr(event->cgrp->info, event->cpu); |
| 467 | return t->time; |
| 468 | } |
| 469 | |
| 470 | static inline void __update_cgrp_time(struct perf_cgroup *cgrp) |
| 471 | { |
| 472 | struct perf_cgroup_info *info; |
| 473 | u64 now; |
| 474 | |
| 475 | now = perf_clock(); |
| 476 | |
| 477 | info = this_cpu_ptr(cgrp->info); |
| 478 | |
| 479 | info->time += now - info->timestamp; |
| 480 | info->timestamp = now; |
| 481 | } |
| 482 | |
| 483 | static inline void update_cgrp_time_from_cpuctx(struct perf_cpu_context *cpuctx) |
| 484 | { |
| 485 | struct perf_cgroup *cgrp_out = cpuctx->cgrp; |
| 486 | if (cgrp_out) |
| 487 | __update_cgrp_time(cgrp_out); |
| 488 | } |
| 489 | |
| 490 | static inline void update_cgrp_time_from_event(struct perf_event *event) |
| 491 | { |
Stephane Eranian | 3f7cce3 | 2011-02-18 14:40:01 +0200 | [diff] [blame] | 492 | struct perf_cgroup *cgrp; |
| 493 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 494 | /* |
Stephane Eranian | 3f7cce3 | 2011-02-18 14:40:01 +0200 | [diff] [blame] | 495 | * ensure we access cgroup data only when needed and |
| 496 | * when we know the cgroup is pinned (css_get) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 497 | */ |
Stephane Eranian | 3f7cce3 | 2011-02-18 14:40:01 +0200 | [diff] [blame] | 498 | if (!is_cgroup_event(event)) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 499 | return; |
| 500 | |
Stephane Eranian | 614e4c4 | 2015-11-12 11:00:04 +0100 | [diff] [blame] | 501 | cgrp = perf_cgroup_from_task(current, event->ctx); |
Stephane Eranian | 3f7cce3 | 2011-02-18 14:40:01 +0200 | [diff] [blame] | 502 | /* |
| 503 | * Do not update time when cgroup is not active |
| 504 | */ |
| 505 | if (cgrp == event->cgrp) |
| 506 | __update_cgrp_time(event->cgrp); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | static inline void |
Stephane Eranian | 3f7cce3 | 2011-02-18 14:40:01 +0200 | [diff] [blame] | 510 | perf_cgroup_set_timestamp(struct task_struct *task, |
| 511 | struct perf_event_context *ctx) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 512 | { |
| 513 | struct perf_cgroup *cgrp; |
| 514 | struct perf_cgroup_info *info; |
| 515 | |
Stephane Eranian | 3f7cce3 | 2011-02-18 14:40:01 +0200 | [diff] [blame] | 516 | /* |
| 517 | * ctx->lock held by caller |
| 518 | * ensure we do not access cgroup data |
| 519 | * unless we have the cgroup pinned (css_get) |
| 520 | */ |
| 521 | if (!task || !ctx->nr_cgroups) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 522 | return; |
| 523 | |
Stephane Eranian | 614e4c4 | 2015-11-12 11:00:04 +0100 | [diff] [blame] | 524 | cgrp = perf_cgroup_from_task(task, ctx); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 525 | info = this_cpu_ptr(cgrp->info); |
Stephane Eranian | 3f7cce3 | 2011-02-18 14:40:01 +0200 | [diff] [blame] | 526 | info->timestamp = ctx->timestamp; |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 527 | } |
| 528 | |
| 529 | #define PERF_CGROUP_SWOUT 0x1 /* cgroup switch out every event */ |
| 530 | #define PERF_CGROUP_SWIN 0x2 /* cgroup switch in events based on task */ |
| 531 | |
| 532 | /* |
| 533 | * reschedule events based on the cgroup constraint of task. |
| 534 | * |
| 535 | * mode SWOUT : schedule out everything |
| 536 | * mode SWIN : schedule in based on cgroup for next |
| 537 | */ |
Geliang Tang | 18ab2cd | 2015-09-27 23:25:50 +0800 | [diff] [blame] | 538 | static void perf_cgroup_switch(struct task_struct *task, int mode) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 539 | { |
| 540 | struct perf_cpu_context *cpuctx; |
| 541 | struct pmu *pmu; |
| 542 | unsigned long flags; |
| 543 | |
| 544 | /* |
| 545 | * disable interrupts to avoid geting nr_cgroup |
| 546 | * changes via __perf_event_disable(). Also |
| 547 | * avoids preemption. |
| 548 | */ |
| 549 | local_irq_save(flags); |
| 550 | |
| 551 | /* |
| 552 | * we reschedule only in the presence of cgroup |
| 553 | * constrained events. |
| 554 | */ |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 555 | |
| 556 | list_for_each_entry_rcu(pmu, &pmus, entry) { |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 557 | cpuctx = this_cpu_ptr(pmu->pmu_cpu_context); |
Peter Zijlstra | 95cf59e | 2012-10-02 15:41:23 +0200 | [diff] [blame] | 558 | if (cpuctx->unique_pmu != pmu) |
| 559 | continue; /* ensure we process each cpuctx once */ |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 560 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 561 | /* |
| 562 | * perf_cgroup_events says at least one |
| 563 | * context on this CPU has cgroup events. |
| 564 | * |
| 565 | * ctx->nr_cgroups reports the number of cgroup |
| 566 | * events for a context. |
| 567 | */ |
| 568 | if (cpuctx->ctx.nr_cgroups > 0) { |
Peter Zijlstra | facc430 | 2011-04-09 21:17:42 +0200 | [diff] [blame] | 569 | perf_ctx_lock(cpuctx, cpuctx->task_ctx); |
| 570 | perf_pmu_disable(cpuctx->ctx.pmu); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 571 | |
| 572 | if (mode & PERF_CGROUP_SWOUT) { |
| 573 | cpu_ctx_sched_out(cpuctx, EVENT_ALL); |
| 574 | /* |
| 575 | * must not be done before ctxswout due |
| 576 | * to event_filter_match() in event_sched_out() |
| 577 | */ |
| 578 | cpuctx->cgrp = NULL; |
| 579 | } |
| 580 | |
| 581 | if (mode & PERF_CGROUP_SWIN) { |
Stephane Eranian | e566b76 | 2011-04-06 02:54:54 +0200 | [diff] [blame] | 582 | WARN_ON_ONCE(cpuctx->cgrp); |
Peter Zijlstra | 95cf59e | 2012-10-02 15:41:23 +0200 | [diff] [blame] | 583 | /* |
| 584 | * set cgrp before ctxsw in to allow |
| 585 | * event_filter_match() to not have to pass |
| 586 | * task around |
Stephane Eranian | 614e4c4 | 2015-11-12 11:00:04 +0100 | [diff] [blame] | 587 | * we pass the cpuctx->ctx to perf_cgroup_from_task() |
| 588 | * because cgorup events are only per-cpu |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 589 | */ |
Stephane Eranian | 614e4c4 | 2015-11-12 11:00:04 +0100 | [diff] [blame] | 590 | cpuctx->cgrp = perf_cgroup_from_task(task, &cpuctx->ctx); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 591 | cpu_ctx_sched_in(cpuctx, EVENT_ALL, task); |
| 592 | } |
Peter Zijlstra | facc430 | 2011-04-09 21:17:42 +0200 | [diff] [blame] | 593 | perf_pmu_enable(cpuctx->ctx.pmu); |
| 594 | perf_ctx_unlock(cpuctx, cpuctx->task_ctx); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 595 | } |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 596 | } |
| 597 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 598 | local_irq_restore(flags); |
| 599 | } |
| 600 | |
Stephane Eranian | a8d757e | 2011-08-25 15:58:03 +0200 | [diff] [blame] | 601 | static inline void perf_cgroup_sched_out(struct task_struct *task, |
| 602 | struct task_struct *next) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 603 | { |
Stephane Eranian | a8d757e | 2011-08-25 15:58:03 +0200 | [diff] [blame] | 604 | struct perf_cgroup *cgrp1; |
| 605 | struct perf_cgroup *cgrp2 = NULL; |
| 606 | |
Stephane Eranian | ddaaf4e | 2015-11-12 11:00:03 +0100 | [diff] [blame] | 607 | rcu_read_lock(); |
Stephane Eranian | a8d757e | 2011-08-25 15:58:03 +0200 | [diff] [blame] | 608 | /* |
| 609 | * we come here when we know perf_cgroup_events > 0 |
Stephane Eranian | 614e4c4 | 2015-11-12 11:00:04 +0100 | [diff] [blame] | 610 | * we do not need to pass the ctx here because we know |
| 611 | * we are holding the rcu lock |
Stephane Eranian | a8d757e | 2011-08-25 15:58:03 +0200 | [diff] [blame] | 612 | */ |
Stephane Eranian | 614e4c4 | 2015-11-12 11:00:04 +0100 | [diff] [blame] | 613 | cgrp1 = perf_cgroup_from_task(task, NULL); |
Peter Zijlstra | 70a0165 | 2016-01-08 09:29:16 +0100 | [diff] [blame] | 614 | cgrp2 = perf_cgroup_from_task(next, NULL); |
Stephane Eranian | a8d757e | 2011-08-25 15:58:03 +0200 | [diff] [blame] | 615 | |
| 616 | /* |
| 617 | * only schedule out current cgroup events if we know |
| 618 | * that we are switching to a different cgroup. Otherwise, |
| 619 | * do no touch the cgroup events. |
| 620 | */ |
| 621 | if (cgrp1 != cgrp2) |
| 622 | perf_cgroup_switch(task, PERF_CGROUP_SWOUT); |
Stephane Eranian | ddaaf4e | 2015-11-12 11:00:03 +0100 | [diff] [blame] | 623 | |
| 624 | rcu_read_unlock(); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 625 | } |
| 626 | |
Stephane Eranian | a8d757e | 2011-08-25 15:58:03 +0200 | [diff] [blame] | 627 | static inline void perf_cgroup_sched_in(struct task_struct *prev, |
| 628 | struct task_struct *task) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 629 | { |
Stephane Eranian | a8d757e | 2011-08-25 15:58:03 +0200 | [diff] [blame] | 630 | struct perf_cgroup *cgrp1; |
| 631 | struct perf_cgroup *cgrp2 = NULL; |
| 632 | |
Stephane Eranian | ddaaf4e | 2015-11-12 11:00:03 +0100 | [diff] [blame] | 633 | rcu_read_lock(); |
Stephane Eranian | a8d757e | 2011-08-25 15:58:03 +0200 | [diff] [blame] | 634 | /* |
| 635 | * we come here when we know perf_cgroup_events > 0 |
Stephane Eranian | 614e4c4 | 2015-11-12 11:00:04 +0100 | [diff] [blame] | 636 | * we do not need to pass the ctx here because we know |
| 637 | * we are holding the rcu lock |
Stephane Eranian | a8d757e | 2011-08-25 15:58:03 +0200 | [diff] [blame] | 638 | */ |
Stephane Eranian | 614e4c4 | 2015-11-12 11:00:04 +0100 | [diff] [blame] | 639 | cgrp1 = perf_cgroup_from_task(task, NULL); |
Stephane Eranian | 614e4c4 | 2015-11-12 11:00:04 +0100 | [diff] [blame] | 640 | cgrp2 = perf_cgroup_from_task(prev, NULL); |
Stephane Eranian | a8d757e | 2011-08-25 15:58:03 +0200 | [diff] [blame] | 641 | |
| 642 | /* |
| 643 | * only need to schedule in cgroup events if we are changing |
| 644 | * cgroup during ctxsw. Cgroup events were not scheduled |
| 645 | * out of ctxsw out if that was not the case. |
| 646 | */ |
| 647 | if (cgrp1 != cgrp2) |
| 648 | perf_cgroup_switch(task, PERF_CGROUP_SWIN); |
Stephane Eranian | ddaaf4e | 2015-11-12 11:00:03 +0100 | [diff] [blame] | 649 | |
| 650 | rcu_read_unlock(); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 651 | } |
| 652 | |
| 653 | static inline int perf_cgroup_connect(int fd, struct perf_event *event, |
| 654 | struct perf_event_attr *attr, |
| 655 | struct perf_event *group_leader) |
| 656 | { |
| 657 | struct perf_cgroup *cgrp; |
| 658 | struct cgroup_subsys_state *css; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 659 | struct fd f = fdget(fd); |
| 660 | int ret = 0; |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 661 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 662 | if (!f.file) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 663 | return -EBADF; |
| 664 | |
Al Viro | b583043 | 2014-10-31 01:22:04 -0400 | [diff] [blame] | 665 | css = css_tryget_online_from_dir(f.file->f_path.dentry, |
Tejun Heo | ec903c0 | 2014-05-13 12:11:01 -0400 | [diff] [blame] | 666 | &perf_event_cgrp_subsys); |
Li Zefan | 3db272c | 2011-03-03 14:25:37 +0800 | [diff] [blame] | 667 | if (IS_ERR(css)) { |
| 668 | ret = PTR_ERR(css); |
| 669 | goto out; |
| 670 | } |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 671 | |
| 672 | cgrp = container_of(css, struct perf_cgroup, css); |
| 673 | event->cgrp = cgrp; |
| 674 | |
| 675 | /* |
| 676 | * all events in a group must monitor |
| 677 | * the same cgroup because a task belongs |
| 678 | * to only one perf cgroup at a time |
| 679 | */ |
| 680 | if (group_leader && group_leader->cgrp != cgrp) { |
| 681 | perf_detach_cgroup(event); |
| 682 | ret = -EINVAL; |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 683 | } |
Li Zefan | 3db272c | 2011-03-03 14:25:37 +0800 | [diff] [blame] | 684 | out: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 685 | fdput(f); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 686 | return ret; |
| 687 | } |
| 688 | |
| 689 | static inline void |
| 690 | perf_cgroup_set_shadow_time(struct perf_event *event, u64 now) |
| 691 | { |
| 692 | struct perf_cgroup_info *t; |
| 693 | t = per_cpu_ptr(event->cgrp->info, event->cpu); |
| 694 | event->shadow_ctx_time = now - t->timestamp; |
| 695 | } |
| 696 | |
| 697 | static inline void |
| 698 | perf_cgroup_defer_enabled(struct perf_event *event) |
| 699 | { |
| 700 | /* |
| 701 | * when the current task's perf cgroup does not match |
| 702 | * the event's, we need to remember to call the |
| 703 | * perf_mark_enable() function the first time a task with |
| 704 | * a matching perf cgroup is scheduled in. |
| 705 | */ |
| 706 | if (is_cgroup_event(event) && !perf_cgroup_match(event)) |
| 707 | event->cgrp_defer_enabled = 1; |
| 708 | } |
| 709 | |
| 710 | static inline void |
| 711 | perf_cgroup_mark_enabled(struct perf_event *event, |
| 712 | struct perf_event_context *ctx) |
| 713 | { |
| 714 | struct perf_event *sub; |
| 715 | u64 tstamp = perf_event_time(event); |
| 716 | |
| 717 | if (!event->cgrp_defer_enabled) |
| 718 | return; |
| 719 | |
| 720 | event->cgrp_defer_enabled = 0; |
| 721 | |
| 722 | event->tstamp_enabled = tstamp - event->total_time_enabled; |
| 723 | list_for_each_entry(sub, &event->sibling_list, group_entry) { |
| 724 | if (sub->state >= PERF_EVENT_STATE_INACTIVE) { |
| 725 | sub->tstamp_enabled = tstamp - sub->total_time_enabled; |
| 726 | sub->cgrp_defer_enabled = 0; |
| 727 | } |
| 728 | } |
| 729 | } |
| 730 | #else /* !CONFIG_CGROUP_PERF */ |
| 731 | |
| 732 | static inline bool |
| 733 | perf_cgroup_match(struct perf_event *event) |
| 734 | { |
| 735 | return true; |
| 736 | } |
| 737 | |
| 738 | static inline void perf_detach_cgroup(struct perf_event *event) |
| 739 | {} |
| 740 | |
| 741 | static inline int is_cgroup_event(struct perf_event *event) |
| 742 | { |
| 743 | return 0; |
| 744 | } |
| 745 | |
| 746 | static inline u64 perf_cgroup_event_cgrp_time(struct perf_event *event) |
| 747 | { |
| 748 | return 0; |
| 749 | } |
| 750 | |
| 751 | static inline void update_cgrp_time_from_event(struct perf_event *event) |
| 752 | { |
| 753 | } |
| 754 | |
| 755 | static inline void update_cgrp_time_from_cpuctx(struct perf_cpu_context *cpuctx) |
| 756 | { |
| 757 | } |
| 758 | |
Stephane Eranian | a8d757e | 2011-08-25 15:58:03 +0200 | [diff] [blame] | 759 | static inline void perf_cgroup_sched_out(struct task_struct *task, |
| 760 | struct task_struct *next) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 761 | { |
| 762 | } |
| 763 | |
Stephane Eranian | a8d757e | 2011-08-25 15:58:03 +0200 | [diff] [blame] | 764 | static inline void perf_cgroup_sched_in(struct task_struct *prev, |
| 765 | struct task_struct *task) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 766 | { |
| 767 | } |
| 768 | |
| 769 | static inline int perf_cgroup_connect(pid_t pid, struct perf_event *event, |
| 770 | struct perf_event_attr *attr, |
| 771 | struct perf_event *group_leader) |
| 772 | { |
| 773 | return -EINVAL; |
| 774 | } |
| 775 | |
| 776 | static inline void |
Stephane Eranian | 3f7cce3 | 2011-02-18 14:40:01 +0200 | [diff] [blame] | 777 | perf_cgroup_set_timestamp(struct task_struct *task, |
| 778 | struct perf_event_context *ctx) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 779 | { |
| 780 | } |
| 781 | |
| 782 | void |
| 783 | perf_cgroup_switch(struct task_struct *task, struct task_struct *next) |
| 784 | { |
| 785 | } |
| 786 | |
| 787 | static inline void |
| 788 | perf_cgroup_set_shadow_time(struct perf_event *event, u64 now) |
| 789 | { |
| 790 | } |
| 791 | |
| 792 | static inline u64 perf_cgroup_event_time(struct perf_event *event) |
| 793 | { |
| 794 | return 0; |
| 795 | } |
| 796 | |
| 797 | static inline void |
| 798 | perf_cgroup_defer_enabled(struct perf_event *event) |
| 799 | { |
| 800 | } |
| 801 | |
| 802 | static inline void |
| 803 | perf_cgroup_mark_enabled(struct perf_event *event, |
| 804 | struct perf_event_context *ctx) |
| 805 | { |
| 806 | } |
| 807 | #endif |
| 808 | |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 809 | /* |
| 810 | * set default to be dependent on timer tick just |
| 811 | * like original code |
| 812 | */ |
| 813 | #define PERF_CPU_HRTIMER (1000 / HZ) |
| 814 | /* |
| 815 | * function must be called with interrupts disbled |
| 816 | */ |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 817 | static enum hrtimer_restart perf_mux_hrtimer_handler(struct hrtimer *hr) |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 818 | { |
| 819 | struct perf_cpu_context *cpuctx; |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 820 | int rotations = 0; |
| 821 | |
| 822 | WARN_ON(!irqs_disabled()); |
| 823 | |
| 824 | cpuctx = container_of(hr, struct perf_cpu_context, hrtimer); |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 825 | rotations = perf_rotate_context(cpuctx); |
| 826 | |
Peter Zijlstra | 4cfafd3 | 2015-05-14 12:23:11 +0200 | [diff] [blame] | 827 | raw_spin_lock(&cpuctx->hrtimer_lock); |
| 828 | if (rotations) |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 829 | hrtimer_forward_now(hr, cpuctx->hrtimer_interval); |
Peter Zijlstra | 4cfafd3 | 2015-05-14 12:23:11 +0200 | [diff] [blame] | 830 | else |
| 831 | cpuctx->hrtimer_active = 0; |
| 832 | raw_spin_unlock(&cpuctx->hrtimer_lock); |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 833 | |
Peter Zijlstra | 4cfafd3 | 2015-05-14 12:23:11 +0200 | [diff] [blame] | 834 | return rotations ? HRTIMER_RESTART : HRTIMER_NORESTART; |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 835 | } |
| 836 | |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 837 | static void __perf_mux_hrtimer_init(struct perf_cpu_context *cpuctx, int cpu) |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 838 | { |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 839 | struct hrtimer *timer = &cpuctx->hrtimer; |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 840 | struct pmu *pmu = cpuctx->ctx.pmu; |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 841 | u64 interval; |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 842 | |
| 843 | /* no multiplexing needed for SW PMU */ |
| 844 | if (pmu->task_ctx_nr == perf_sw_context) |
| 845 | return; |
| 846 | |
Stephane Eranian | 62b8563 | 2013-04-03 14:21:34 +0200 | [diff] [blame] | 847 | /* |
| 848 | * check default is sane, if not set then force to |
| 849 | * default interval (1/tick) |
| 850 | */ |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 851 | interval = pmu->hrtimer_interval_ms; |
| 852 | if (interval < 1) |
| 853 | interval = pmu->hrtimer_interval_ms = PERF_CPU_HRTIMER; |
Stephane Eranian | 62b8563 | 2013-04-03 14:21:34 +0200 | [diff] [blame] | 854 | |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 855 | cpuctx->hrtimer_interval = ns_to_ktime(NSEC_PER_MSEC * interval); |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 856 | |
Peter Zijlstra | 4cfafd3 | 2015-05-14 12:23:11 +0200 | [diff] [blame] | 857 | raw_spin_lock_init(&cpuctx->hrtimer_lock); |
| 858 | hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED); |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 859 | timer->function = perf_mux_hrtimer_handler; |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 860 | } |
| 861 | |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 862 | static int perf_mux_hrtimer_restart(struct perf_cpu_context *cpuctx) |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 863 | { |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 864 | struct hrtimer *timer = &cpuctx->hrtimer; |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 865 | struct pmu *pmu = cpuctx->ctx.pmu; |
Peter Zijlstra | 4cfafd3 | 2015-05-14 12:23:11 +0200 | [diff] [blame] | 866 | unsigned long flags; |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 867 | |
| 868 | /* not for SW PMU */ |
| 869 | if (pmu->task_ctx_nr == perf_sw_context) |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 870 | return 0; |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 871 | |
Peter Zijlstra | 4cfafd3 | 2015-05-14 12:23:11 +0200 | [diff] [blame] | 872 | raw_spin_lock_irqsave(&cpuctx->hrtimer_lock, flags); |
| 873 | if (!cpuctx->hrtimer_active) { |
| 874 | cpuctx->hrtimer_active = 1; |
| 875 | hrtimer_forward_now(timer, cpuctx->hrtimer_interval); |
| 876 | hrtimer_start_expires(timer, HRTIMER_MODE_ABS_PINNED); |
| 877 | } |
| 878 | raw_spin_unlock_irqrestore(&cpuctx->hrtimer_lock, flags); |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 879 | |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 880 | return 0; |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 881 | } |
| 882 | |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 883 | void perf_pmu_disable(struct pmu *pmu) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 884 | { |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 885 | int *count = this_cpu_ptr(pmu->pmu_disable_count); |
| 886 | if (!(*count)++) |
| 887 | pmu->pmu_disable(pmu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 888 | } |
| 889 | |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 890 | void perf_pmu_enable(struct pmu *pmu) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 891 | { |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 892 | int *count = this_cpu_ptr(pmu->pmu_disable_count); |
| 893 | if (!--(*count)) |
| 894 | pmu->pmu_enable(pmu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 895 | } |
| 896 | |
Mark Rutland | 2fde4f9 | 2015-01-07 15:01:54 +0000 | [diff] [blame] | 897 | static DEFINE_PER_CPU(struct list_head, active_ctx_list); |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 898 | |
| 899 | /* |
Mark Rutland | 2fde4f9 | 2015-01-07 15:01:54 +0000 | [diff] [blame] | 900 | * perf_event_ctx_activate(), perf_event_ctx_deactivate(), and |
| 901 | * perf_event_task_tick() are fully serialized because they're strictly cpu |
| 902 | * affine and perf_event_ctx{activate,deactivate} are called with IRQs |
| 903 | * disabled, while perf_event_task_tick is called from IRQ context. |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 904 | */ |
Mark Rutland | 2fde4f9 | 2015-01-07 15:01:54 +0000 | [diff] [blame] | 905 | static void perf_event_ctx_activate(struct perf_event_context *ctx) |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 906 | { |
Mark Rutland | 2fde4f9 | 2015-01-07 15:01:54 +0000 | [diff] [blame] | 907 | struct list_head *head = this_cpu_ptr(&active_ctx_list); |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 908 | |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 909 | WARN_ON(!irqs_disabled()); |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 910 | |
Mark Rutland | 2fde4f9 | 2015-01-07 15:01:54 +0000 | [diff] [blame] | 911 | WARN_ON(!list_empty(&ctx->active_ctx_list)); |
| 912 | |
| 913 | list_add(&ctx->active_ctx_list, head); |
| 914 | } |
| 915 | |
| 916 | static void perf_event_ctx_deactivate(struct perf_event_context *ctx) |
| 917 | { |
| 918 | WARN_ON(!irqs_disabled()); |
| 919 | |
| 920 | WARN_ON(list_empty(&ctx->active_ctx_list)); |
| 921 | |
| 922 | list_del_init(&ctx->active_ctx_list); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 923 | } |
| 924 | |
| 925 | static void get_ctx(struct perf_event_context *ctx) |
| 926 | { |
| 927 | WARN_ON(!atomic_inc_not_zero(&ctx->refcount)); |
| 928 | } |
| 929 | |
Yan, Zheng | 4af57ef28 | 2014-11-04 21:56:01 -0500 | [diff] [blame] | 930 | static void free_ctx(struct rcu_head *head) |
| 931 | { |
| 932 | struct perf_event_context *ctx; |
| 933 | |
| 934 | ctx = container_of(head, struct perf_event_context, rcu_head); |
| 935 | kfree(ctx->task_ctx_data); |
| 936 | kfree(ctx); |
| 937 | } |
| 938 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 939 | static void put_ctx(struct perf_event_context *ctx) |
| 940 | { |
| 941 | if (atomic_dec_and_test(&ctx->refcount)) { |
| 942 | if (ctx->parent_ctx) |
| 943 | put_ctx(ctx->parent_ctx); |
| 944 | if (ctx->task) |
| 945 | put_task_struct(ctx->task); |
Yan, Zheng | 4af57ef28 | 2014-11-04 21:56:01 -0500 | [diff] [blame] | 946 | call_rcu(&ctx->rcu_head, free_ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 947 | } |
| 948 | } |
| 949 | |
Peter Zijlstra | 211de6e | 2014-09-30 19:23:08 +0200 | [diff] [blame] | 950 | /* |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 951 | * Because of perf_event::ctx migration in sys_perf_event_open::move_group and |
| 952 | * perf_pmu_migrate_context() we need some magic. |
| 953 | * |
| 954 | * Those places that change perf_event::ctx will hold both |
| 955 | * perf_event_ctx::mutex of the 'old' and 'new' ctx value. |
| 956 | * |
Peter Zijlstra | 8b10c5e | 2015-05-01 16:08:46 +0200 | [diff] [blame] | 957 | * Lock ordering is by mutex address. There are two other sites where |
| 958 | * perf_event_context::mutex nests and those are: |
| 959 | * |
| 960 | * - perf_event_exit_task_context() [ child , 0 ] |
| 961 | * __perf_event_exit_task() |
| 962 | * sync_child_event() |
| 963 | * put_event() [ parent, 1 ] |
| 964 | * |
| 965 | * - perf_event_init_context() [ parent, 0 ] |
| 966 | * inherit_task_group() |
| 967 | * inherit_group() |
| 968 | * inherit_event() |
| 969 | * perf_event_alloc() |
| 970 | * perf_init_event() |
| 971 | * perf_try_init_event() [ child , 1 ] |
| 972 | * |
| 973 | * While it appears there is an obvious deadlock here -- the parent and child |
| 974 | * nesting levels are inverted between the two. This is in fact safe because |
| 975 | * life-time rules separate them. That is an exiting task cannot fork, and a |
| 976 | * spawning task cannot (yet) exit. |
| 977 | * |
| 978 | * But remember that that these are parent<->child context relations, and |
| 979 | * migration does not affect children, therefore these two orderings should not |
| 980 | * interact. |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 981 | * |
| 982 | * The change in perf_event::ctx does not affect children (as claimed above) |
| 983 | * because the sys_perf_event_open() case will install a new event and break |
| 984 | * the ctx parent<->child relation, and perf_pmu_migrate_context() is only |
| 985 | * concerned with cpuctx and that doesn't have children. |
| 986 | * |
| 987 | * The places that change perf_event::ctx will issue: |
| 988 | * |
| 989 | * perf_remove_from_context(); |
| 990 | * synchronize_rcu(); |
| 991 | * perf_install_in_context(); |
| 992 | * |
| 993 | * to affect the change. The remove_from_context() + synchronize_rcu() should |
| 994 | * quiesce the event, after which we can install it in the new location. This |
| 995 | * means that only external vectors (perf_fops, prctl) can perturb the event |
| 996 | * while in transit. Therefore all such accessors should also acquire |
| 997 | * perf_event_context::mutex to serialize against this. |
| 998 | * |
| 999 | * However; because event->ctx can change while we're waiting to acquire |
| 1000 | * ctx->mutex we must be careful and use the below perf_event_ctx_lock() |
| 1001 | * function. |
| 1002 | * |
| 1003 | * Lock order: |
| 1004 | * task_struct::perf_event_mutex |
| 1005 | * perf_event_context::mutex |
| 1006 | * perf_event_context::lock |
| 1007 | * perf_event::child_mutex; |
| 1008 | * perf_event::mmap_mutex |
| 1009 | * mmap_sem |
| 1010 | */ |
Peter Zijlstra | a83fe28 | 2015-01-29 14:44:34 +0100 | [diff] [blame] | 1011 | static struct perf_event_context * |
| 1012 | perf_event_ctx_lock_nested(struct perf_event *event, int nesting) |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 1013 | { |
| 1014 | struct perf_event_context *ctx; |
| 1015 | |
| 1016 | again: |
| 1017 | rcu_read_lock(); |
| 1018 | ctx = ACCESS_ONCE(event->ctx); |
| 1019 | if (!atomic_inc_not_zero(&ctx->refcount)) { |
| 1020 | rcu_read_unlock(); |
| 1021 | goto again; |
| 1022 | } |
| 1023 | rcu_read_unlock(); |
| 1024 | |
Peter Zijlstra | a83fe28 | 2015-01-29 14:44:34 +0100 | [diff] [blame] | 1025 | mutex_lock_nested(&ctx->mutex, nesting); |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 1026 | if (event->ctx != ctx) { |
| 1027 | mutex_unlock(&ctx->mutex); |
| 1028 | put_ctx(ctx); |
| 1029 | goto again; |
| 1030 | } |
| 1031 | |
| 1032 | return ctx; |
| 1033 | } |
| 1034 | |
Peter Zijlstra | a83fe28 | 2015-01-29 14:44:34 +0100 | [diff] [blame] | 1035 | static inline struct perf_event_context * |
| 1036 | perf_event_ctx_lock(struct perf_event *event) |
| 1037 | { |
| 1038 | return perf_event_ctx_lock_nested(event, 0); |
| 1039 | } |
| 1040 | |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 1041 | static void perf_event_ctx_unlock(struct perf_event *event, |
| 1042 | struct perf_event_context *ctx) |
| 1043 | { |
| 1044 | mutex_unlock(&ctx->mutex); |
| 1045 | put_ctx(ctx); |
| 1046 | } |
| 1047 | |
| 1048 | /* |
Peter Zijlstra | 211de6e | 2014-09-30 19:23:08 +0200 | [diff] [blame] | 1049 | * This must be done under the ctx->lock, such as to serialize against |
| 1050 | * context_equiv(), therefore we cannot call put_ctx() since that might end up |
| 1051 | * calling scheduler related locks and ctx->lock nests inside those. |
| 1052 | */ |
| 1053 | static __must_check struct perf_event_context * |
| 1054 | unclone_ctx(struct perf_event_context *ctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1055 | { |
Peter Zijlstra | 211de6e | 2014-09-30 19:23:08 +0200 | [diff] [blame] | 1056 | struct perf_event_context *parent_ctx = ctx->parent_ctx; |
| 1057 | |
| 1058 | lockdep_assert_held(&ctx->lock); |
| 1059 | |
| 1060 | if (parent_ctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1061 | ctx->parent_ctx = NULL; |
Peter Zijlstra | 5a3126d | 2013-10-07 17:12:48 +0200 | [diff] [blame] | 1062 | ctx->generation++; |
Peter Zijlstra | 211de6e | 2014-09-30 19:23:08 +0200 | [diff] [blame] | 1063 | |
| 1064 | return parent_ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1065 | } |
| 1066 | |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 1067 | static u32 perf_event_pid(struct perf_event *event, struct task_struct *p) |
| 1068 | { |
| 1069 | /* |
| 1070 | * only top level events have the pid namespace they were created in |
| 1071 | */ |
| 1072 | if (event->parent) |
| 1073 | event = event->parent; |
| 1074 | |
| 1075 | return task_tgid_nr_ns(p, event->ns); |
| 1076 | } |
| 1077 | |
| 1078 | static u32 perf_event_tid(struct perf_event *event, struct task_struct *p) |
| 1079 | { |
| 1080 | /* |
| 1081 | * only top level events have the pid namespace they were created in |
| 1082 | */ |
| 1083 | if (event->parent) |
| 1084 | event = event->parent; |
| 1085 | |
| 1086 | return task_pid_nr_ns(p, event->ns); |
| 1087 | } |
| 1088 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1089 | /* |
| 1090 | * If we inherit events we want to return the parent event id |
| 1091 | * to userspace. |
| 1092 | */ |
| 1093 | static u64 primary_event_id(struct perf_event *event) |
| 1094 | { |
| 1095 | u64 id = event->id; |
| 1096 | |
| 1097 | if (event->parent) |
| 1098 | id = event->parent->id; |
| 1099 | |
| 1100 | return id; |
| 1101 | } |
| 1102 | |
| 1103 | /* |
| 1104 | * Get the perf_event_context for a task and lock it. |
| 1105 | * This has to cope with with the fact that until it is locked, |
| 1106 | * the context could get moved to another task. |
| 1107 | */ |
| 1108 | static struct perf_event_context * |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1109 | perf_lock_task_context(struct task_struct *task, int ctxn, unsigned long *flags) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1110 | { |
| 1111 | struct perf_event_context *ctx; |
| 1112 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1113 | retry: |
Peter Zijlstra | 058ebd0 | 2013-07-12 11:08:33 +0200 | [diff] [blame] | 1114 | /* |
| 1115 | * One of the few rules of preemptible RCU is that one cannot do |
| 1116 | * rcu_read_unlock() while holding a scheduler (or nested) lock when |
Paul E. McKenney | 2fd5907 | 2015-11-04 05:48:38 -0800 | [diff] [blame] | 1117 | * part of the read side critical section was irqs-enabled -- see |
Peter Zijlstra | 058ebd0 | 2013-07-12 11:08:33 +0200 | [diff] [blame] | 1118 | * rcu_read_unlock_special(). |
| 1119 | * |
| 1120 | * Since ctx->lock nests under rq->lock we must ensure the entire read |
Paul E. McKenney | 2fd5907 | 2015-11-04 05:48:38 -0800 | [diff] [blame] | 1121 | * side critical section has interrupts disabled. |
Peter Zijlstra | 058ebd0 | 2013-07-12 11:08:33 +0200 | [diff] [blame] | 1122 | */ |
Paul E. McKenney | 2fd5907 | 2015-11-04 05:48:38 -0800 | [diff] [blame] | 1123 | local_irq_save(*flags); |
Peter Zijlstra | 058ebd0 | 2013-07-12 11:08:33 +0200 | [diff] [blame] | 1124 | rcu_read_lock(); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1125 | ctx = rcu_dereference(task->perf_event_ctxp[ctxn]); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1126 | if (ctx) { |
| 1127 | /* |
| 1128 | * If this context is a clone of another, it might |
| 1129 | * get swapped for another underneath us by |
| 1130 | * perf_event_task_sched_out, though the |
| 1131 | * rcu_read_lock() protects us from any context |
| 1132 | * getting freed. Lock the context and check if it |
| 1133 | * got swapped before we could get the lock, and retry |
| 1134 | * if so. If we locked the right context, then it |
| 1135 | * can't get swapped on us any more. |
| 1136 | */ |
Paul E. McKenney | 2fd5907 | 2015-11-04 05:48:38 -0800 | [diff] [blame] | 1137 | raw_spin_lock(&ctx->lock); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1138 | if (ctx != rcu_dereference(task->perf_event_ctxp[ctxn])) { |
Paul E. McKenney | 2fd5907 | 2015-11-04 05:48:38 -0800 | [diff] [blame] | 1139 | raw_spin_unlock(&ctx->lock); |
Peter Zijlstra | 058ebd0 | 2013-07-12 11:08:33 +0200 | [diff] [blame] | 1140 | rcu_read_unlock(); |
Paul E. McKenney | 2fd5907 | 2015-11-04 05:48:38 -0800 | [diff] [blame] | 1141 | local_irq_restore(*flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1142 | goto retry; |
| 1143 | } |
| 1144 | |
| 1145 | if (!atomic_inc_not_zero(&ctx->refcount)) { |
Paul E. McKenney | 2fd5907 | 2015-11-04 05:48:38 -0800 | [diff] [blame] | 1146 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1147 | ctx = NULL; |
| 1148 | } |
| 1149 | } |
| 1150 | rcu_read_unlock(); |
Paul E. McKenney | 2fd5907 | 2015-11-04 05:48:38 -0800 | [diff] [blame] | 1151 | if (!ctx) |
| 1152 | local_irq_restore(*flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1153 | return ctx; |
| 1154 | } |
| 1155 | |
| 1156 | /* |
| 1157 | * Get the context for a task and increment its pin_count so it |
| 1158 | * can't get swapped to another task. This also increments its |
| 1159 | * reference count so that the context can't get freed. |
| 1160 | */ |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1161 | static struct perf_event_context * |
| 1162 | perf_pin_task_context(struct task_struct *task, int ctxn) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1163 | { |
| 1164 | struct perf_event_context *ctx; |
| 1165 | unsigned long flags; |
| 1166 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1167 | ctx = perf_lock_task_context(task, ctxn, &flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1168 | if (ctx) { |
| 1169 | ++ctx->pin_count; |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1170 | raw_spin_unlock_irqrestore(&ctx->lock, flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1171 | } |
| 1172 | return ctx; |
| 1173 | } |
| 1174 | |
| 1175 | static void perf_unpin_context(struct perf_event_context *ctx) |
| 1176 | { |
| 1177 | unsigned long flags; |
| 1178 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1179 | raw_spin_lock_irqsave(&ctx->lock, flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1180 | --ctx->pin_count; |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1181 | raw_spin_unlock_irqrestore(&ctx->lock, flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1182 | } |
| 1183 | |
Peter Zijlstra | f67218c | 2009-11-23 11:37:27 +0100 | [diff] [blame] | 1184 | /* |
| 1185 | * Update the record of the current time in a context. |
| 1186 | */ |
| 1187 | static void update_context_time(struct perf_event_context *ctx) |
| 1188 | { |
| 1189 | u64 now = perf_clock(); |
| 1190 | |
| 1191 | ctx->time += now - ctx->timestamp; |
| 1192 | ctx->timestamp = now; |
| 1193 | } |
| 1194 | |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1195 | static u64 perf_event_time(struct perf_event *event) |
| 1196 | { |
| 1197 | struct perf_event_context *ctx = event->ctx; |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 1198 | |
| 1199 | if (is_cgroup_event(event)) |
| 1200 | return perf_cgroup_event_time(event); |
| 1201 | |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1202 | return ctx ? ctx->time : 0; |
| 1203 | } |
| 1204 | |
Peter Zijlstra | f67218c | 2009-11-23 11:37:27 +0100 | [diff] [blame] | 1205 | /* |
| 1206 | * Update the total_time_enabled and total_time_running fields for a event. |
Eric B Munson | b7526f0 | 2011-06-23 16:34:37 -0400 | [diff] [blame] | 1207 | * The caller of this function needs to hold the ctx->lock. |
Peter Zijlstra | f67218c | 2009-11-23 11:37:27 +0100 | [diff] [blame] | 1208 | */ |
| 1209 | static void update_event_times(struct perf_event *event) |
| 1210 | { |
| 1211 | struct perf_event_context *ctx = event->ctx; |
| 1212 | u64 run_end; |
| 1213 | |
| 1214 | if (event->state < PERF_EVENT_STATE_INACTIVE || |
| 1215 | event->group_leader->state < PERF_EVENT_STATE_INACTIVE) |
| 1216 | return; |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 1217 | /* |
| 1218 | * in cgroup mode, time_enabled represents |
| 1219 | * the time the event was enabled AND active |
| 1220 | * tasks were in the monitored cgroup. This is |
| 1221 | * independent of the activity of the context as |
| 1222 | * there may be a mix of cgroup and non-cgroup events. |
| 1223 | * |
| 1224 | * That is why we treat cgroup events differently |
| 1225 | * here. |
| 1226 | */ |
| 1227 | if (is_cgroup_event(event)) |
Namhyung Kim | 46cd6a7f | 2012-01-20 10:12:46 +0900 | [diff] [blame] | 1228 | run_end = perf_cgroup_event_time(event); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 1229 | else if (ctx->is_active) |
| 1230 | run_end = ctx->time; |
Peter Zijlstra | acd1d7c | 2009-11-23 15:00:36 +0100 | [diff] [blame] | 1231 | else |
| 1232 | run_end = event->tstamp_stopped; |
| 1233 | |
| 1234 | event->total_time_enabled = run_end - event->tstamp_enabled; |
Peter Zijlstra | f67218c | 2009-11-23 11:37:27 +0100 | [diff] [blame] | 1235 | |
| 1236 | if (event->state == PERF_EVENT_STATE_INACTIVE) |
| 1237 | run_end = event->tstamp_stopped; |
| 1238 | else |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1239 | run_end = perf_event_time(event); |
Peter Zijlstra | f67218c | 2009-11-23 11:37:27 +0100 | [diff] [blame] | 1240 | |
| 1241 | event->total_time_running = run_end - event->tstamp_running; |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 1242 | |
Peter Zijlstra | f67218c | 2009-11-23 11:37:27 +0100 | [diff] [blame] | 1243 | } |
| 1244 | |
Peter Zijlstra | 96c21a4 | 2010-05-11 16:19:10 +0200 | [diff] [blame] | 1245 | /* |
| 1246 | * Update total_time_enabled and total_time_running for all events in a group. |
| 1247 | */ |
| 1248 | static void update_group_times(struct perf_event *leader) |
| 1249 | { |
| 1250 | struct perf_event *event; |
| 1251 | |
| 1252 | update_event_times(leader); |
| 1253 | list_for_each_entry(event, &leader->sibling_list, group_entry) |
| 1254 | update_event_times(event); |
| 1255 | } |
| 1256 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 1257 | static struct list_head * |
| 1258 | ctx_group_list(struct perf_event *event, struct perf_event_context *ctx) |
| 1259 | { |
| 1260 | if (event->attr.pinned) |
| 1261 | return &ctx->pinned_groups; |
| 1262 | else |
| 1263 | return &ctx->flexible_groups; |
| 1264 | } |
| 1265 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1266 | /* |
| 1267 | * Add a event from the lists for its context. |
| 1268 | * Must be called with ctx->mutex and ctx->lock held. |
| 1269 | */ |
| 1270 | static void |
| 1271 | list_add_event(struct perf_event *event, struct perf_event_context *ctx) |
| 1272 | { |
Peter Zijlstra | c994d61 | 2016-01-08 09:20:23 +0100 | [diff] [blame] | 1273 | lockdep_assert_held(&ctx->lock); |
| 1274 | |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1275 | WARN_ON_ONCE(event->attach_state & PERF_ATTACH_CONTEXT); |
| 1276 | event->attach_state |= PERF_ATTACH_CONTEXT; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1277 | |
| 1278 | /* |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1279 | * If we're a stand alone event or group leader, we go to the context |
| 1280 | * list, group events are kept attached to the group so that |
| 1281 | * perf_group_detach can, at all times, locate all siblings. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1282 | */ |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1283 | if (event->group_leader == event) { |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 1284 | struct list_head *list; |
| 1285 | |
Frederic Weisbecker | d6f962b | 2010-01-10 01:25:51 +0100 | [diff] [blame] | 1286 | if (is_software_event(event)) |
| 1287 | event->group_flags |= PERF_GROUP_SOFTWARE; |
| 1288 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 1289 | list = ctx_group_list(event, ctx); |
| 1290 | list_add_tail(&event->group_entry, list); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1291 | } |
| 1292 | |
Peter Zijlstra | 0830937 | 2011-03-03 11:31:20 +0100 | [diff] [blame] | 1293 | if (is_cgroup_event(event)) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 1294 | ctx->nr_cgroups++; |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 1295 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1296 | list_add_rcu(&event->event_entry, &ctx->event_list); |
| 1297 | ctx->nr_events++; |
| 1298 | if (event->attr.inherit_stat) |
| 1299 | ctx->nr_stat++; |
Peter Zijlstra | 5a3126d | 2013-10-07 17:12:48 +0200 | [diff] [blame] | 1300 | |
| 1301 | ctx->generation++; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1302 | } |
| 1303 | |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 1304 | /* |
Jiri Olsa | 0231bb5 | 2013-02-01 11:23:45 +0100 | [diff] [blame] | 1305 | * Initialize event state based on the perf_event_attr::disabled. |
| 1306 | */ |
| 1307 | static inline void perf_event__state_init(struct perf_event *event) |
| 1308 | { |
| 1309 | event->state = event->attr.disabled ? PERF_EVENT_STATE_OFF : |
| 1310 | PERF_EVENT_STATE_INACTIVE; |
| 1311 | } |
| 1312 | |
Peter Zijlstra | a723968 | 2015-09-09 19:06:33 +0200 | [diff] [blame] | 1313 | static void __perf_event_read_size(struct perf_event *event, int nr_siblings) |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 1314 | { |
| 1315 | int entry = sizeof(u64); /* value */ |
| 1316 | int size = 0; |
| 1317 | int nr = 1; |
| 1318 | |
| 1319 | if (event->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) |
| 1320 | size += sizeof(u64); |
| 1321 | |
| 1322 | if (event->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) |
| 1323 | size += sizeof(u64); |
| 1324 | |
| 1325 | if (event->attr.read_format & PERF_FORMAT_ID) |
| 1326 | entry += sizeof(u64); |
| 1327 | |
| 1328 | if (event->attr.read_format & PERF_FORMAT_GROUP) { |
Peter Zijlstra | a723968 | 2015-09-09 19:06:33 +0200 | [diff] [blame] | 1329 | nr += nr_siblings; |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 1330 | size += sizeof(u64); |
| 1331 | } |
| 1332 | |
| 1333 | size += entry * nr; |
| 1334 | event->read_size = size; |
| 1335 | } |
| 1336 | |
Peter Zijlstra | a723968 | 2015-09-09 19:06:33 +0200 | [diff] [blame] | 1337 | static void __perf_event_header_size(struct perf_event *event, u64 sample_type) |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 1338 | { |
| 1339 | struct perf_sample_data *data; |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 1340 | u16 size = 0; |
| 1341 | |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 1342 | if (sample_type & PERF_SAMPLE_IP) |
| 1343 | size += sizeof(data->ip); |
| 1344 | |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 1345 | if (sample_type & PERF_SAMPLE_ADDR) |
| 1346 | size += sizeof(data->addr); |
| 1347 | |
| 1348 | if (sample_type & PERF_SAMPLE_PERIOD) |
| 1349 | size += sizeof(data->period); |
| 1350 | |
Andi Kleen | c3feedf | 2013-01-24 16:10:28 +0100 | [diff] [blame] | 1351 | if (sample_type & PERF_SAMPLE_WEIGHT) |
| 1352 | size += sizeof(data->weight); |
| 1353 | |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 1354 | if (sample_type & PERF_SAMPLE_READ) |
| 1355 | size += event->read_size; |
| 1356 | |
Stephane Eranian | d6be9ad | 2013-01-24 16:10:31 +0100 | [diff] [blame] | 1357 | if (sample_type & PERF_SAMPLE_DATA_SRC) |
| 1358 | size += sizeof(data->data_src.val); |
| 1359 | |
Andi Kleen | fdfbbd0 | 2013-09-20 07:40:39 -0700 | [diff] [blame] | 1360 | if (sample_type & PERF_SAMPLE_TRANSACTION) |
| 1361 | size += sizeof(data->txn); |
| 1362 | |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 1363 | event->header_size = size; |
| 1364 | } |
| 1365 | |
Peter Zijlstra | a723968 | 2015-09-09 19:06:33 +0200 | [diff] [blame] | 1366 | /* |
| 1367 | * Called at perf_event creation and when events are attached/detached from a |
| 1368 | * group. |
| 1369 | */ |
| 1370 | static void perf_event__header_size(struct perf_event *event) |
| 1371 | { |
| 1372 | __perf_event_read_size(event, |
| 1373 | event->group_leader->nr_siblings); |
| 1374 | __perf_event_header_size(event, event->attr.sample_type); |
| 1375 | } |
| 1376 | |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 1377 | static void perf_event__id_header_size(struct perf_event *event) |
| 1378 | { |
| 1379 | struct perf_sample_data *data; |
| 1380 | u64 sample_type = event->attr.sample_type; |
| 1381 | u16 size = 0; |
| 1382 | |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 1383 | if (sample_type & PERF_SAMPLE_TID) |
| 1384 | size += sizeof(data->tid_entry); |
| 1385 | |
| 1386 | if (sample_type & PERF_SAMPLE_TIME) |
| 1387 | size += sizeof(data->time); |
| 1388 | |
Adrian Hunter | ff3d527 | 2013-08-27 11:23:07 +0300 | [diff] [blame] | 1389 | if (sample_type & PERF_SAMPLE_IDENTIFIER) |
| 1390 | size += sizeof(data->id); |
| 1391 | |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 1392 | if (sample_type & PERF_SAMPLE_ID) |
| 1393 | size += sizeof(data->id); |
| 1394 | |
| 1395 | if (sample_type & PERF_SAMPLE_STREAM_ID) |
| 1396 | size += sizeof(data->stream_id); |
| 1397 | |
| 1398 | if (sample_type & PERF_SAMPLE_CPU) |
| 1399 | size += sizeof(data->cpu_entry); |
| 1400 | |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 1401 | event->id_header_size = size; |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 1402 | } |
| 1403 | |
Peter Zijlstra | a723968 | 2015-09-09 19:06:33 +0200 | [diff] [blame] | 1404 | static bool perf_event_validate_size(struct perf_event *event) |
| 1405 | { |
| 1406 | /* |
| 1407 | * The values computed here will be over-written when we actually |
| 1408 | * attach the event. |
| 1409 | */ |
| 1410 | __perf_event_read_size(event, event->group_leader->nr_siblings + 1); |
| 1411 | __perf_event_header_size(event, event->attr.sample_type & ~PERF_SAMPLE_READ); |
| 1412 | perf_event__id_header_size(event); |
| 1413 | |
| 1414 | /* |
| 1415 | * Sum the lot; should not exceed the 64k limit we have on records. |
| 1416 | * Conservative limit to allow for callchains and other variable fields. |
| 1417 | */ |
| 1418 | if (event->read_size + event->header_size + |
| 1419 | event->id_header_size + sizeof(struct perf_event_header) >= 16*1024) |
| 1420 | return false; |
| 1421 | |
| 1422 | return true; |
| 1423 | } |
| 1424 | |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1425 | static void perf_group_attach(struct perf_event *event) |
| 1426 | { |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 1427 | struct perf_event *group_leader = event->group_leader, *pos; |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1428 | |
Peter Zijlstra | 74c3337 | 2010-10-15 11:40:29 +0200 | [diff] [blame] | 1429 | /* |
| 1430 | * We can have double attach due to group movement in perf_event_open. |
| 1431 | */ |
| 1432 | if (event->attach_state & PERF_ATTACH_GROUP) |
| 1433 | return; |
| 1434 | |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1435 | event->attach_state |= PERF_ATTACH_GROUP; |
| 1436 | |
| 1437 | if (group_leader == event) |
| 1438 | return; |
| 1439 | |
Peter Zijlstra | 652884f | 2015-01-23 11:20:10 +0100 | [diff] [blame] | 1440 | WARN_ON_ONCE(group_leader->ctx != event->ctx); |
| 1441 | |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1442 | if (group_leader->group_flags & PERF_GROUP_SOFTWARE && |
| 1443 | !is_software_event(event)) |
| 1444 | group_leader->group_flags &= ~PERF_GROUP_SOFTWARE; |
| 1445 | |
| 1446 | list_add_tail(&event->group_entry, &group_leader->sibling_list); |
| 1447 | group_leader->nr_siblings++; |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 1448 | |
| 1449 | perf_event__header_size(group_leader); |
| 1450 | |
| 1451 | list_for_each_entry(pos, &group_leader->sibling_list, group_entry) |
| 1452 | perf_event__header_size(pos); |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1453 | } |
| 1454 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1455 | /* |
| 1456 | * Remove a event from the lists for its context. |
| 1457 | * Must be called with ctx->mutex and ctx->lock held. |
| 1458 | */ |
| 1459 | static void |
| 1460 | list_del_event(struct perf_event *event, struct perf_event_context *ctx) |
| 1461 | { |
Stephane Eranian | 68cacd2 | 2011-03-23 16:03:06 +0100 | [diff] [blame] | 1462 | struct perf_cpu_context *cpuctx; |
Peter Zijlstra | 652884f | 2015-01-23 11:20:10 +0100 | [diff] [blame] | 1463 | |
| 1464 | WARN_ON_ONCE(event->ctx != ctx); |
| 1465 | lockdep_assert_held(&ctx->lock); |
| 1466 | |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1467 | /* |
| 1468 | * We can have double detach due to exit/hot-unplug + close. |
| 1469 | */ |
| 1470 | if (!(event->attach_state & PERF_ATTACH_CONTEXT)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1471 | return; |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1472 | |
| 1473 | event->attach_state &= ~PERF_ATTACH_CONTEXT; |
| 1474 | |
Stephane Eranian | 68cacd2 | 2011-03-23 16:03:06 +0100 | [diff] [blame] | 1475 | if (is_cgroup_event(event)) { |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 1476 | ctx->nr_cgroups--; |
Peter Zijlstra | 70a0165 | 2016-01-08 09:29:16 +0100 | [diff] [blame] | 1477 | /* |
| 1478 | * Because cgroup events are always per-cpu events, this will |
| 1479 | * always be called from the right CPU. |
| 1480 | */ |
Stephane Eranian | 68cacd2 | 2011-03-23 16:03:06 +0100 | [diff] [blame] | 1481 | cpuctx = __get_cpu_context(ctx); |
| 1482 | /* |
Peter Zijlstra | 70a0165 | 2016-01-08 09:29:16 +0100 | [diff] [blame] | 1483 | * If there are no more cgroup events then clear cgrp to avoid |
| 1484 | * stale pointer in update_cgrp_time_from_cpuctx(). |
Stephane Eranian | 68cacd2 | 2011-03-23 16:03:06 +0100 | [diff] [blame] | 1485 | */ |
| 1486 | if (!ctx->nr_cgroups) |
| 1487 | cpuctx->cgrp = NULL; |
| 1488 | } |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 1489 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1490 | ctx->nr_events--; |
| 1491 | if (event->attr.inherit_stat) |
| 1492 | ctx->nr_stat--; |
| 1493 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1494 | list_del_rcu(&event->event_entry); |
| 1495 | |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1496 | if (event->group_leader == event) |
| 1497 | list_del_init(&event->group_entry); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1498 | |
Peter Zijlstra | 96c21a4 | 2010-05-11 16:19:10 +0200 | [diff] [blame] | 1499 | update_group_times(event); |
Stephane Eranian | b2e74a2 | 2009-11-26 09:24:30 -0800 | [diff] [blame] | 1500 | |
| 1501 | /* |
| 1502 | * If event was in error state, then keep it |
| 1503 | * that way, otherwise bogus counts will be |
| 1504 | * returned on read(). The only way to get out |
| 1505 | * of error state is by explicit re-enabling |
| 1506 | * of the event |
| 1507 | */ |
| 1508 | if (event->state > PERF_EVENT_STATE_OFF) |
| 1509 | event->state = PERF_EVENT_STATE_OFF; |
Peter Zijlstra | 5a3126d | 2013-10-07 17:12:48 +0200 | [diff] [blame] | 1510 | |
| 1511 | ctx->generation++; |
Peter Zijlstra | 050735b | 2010-05-11 11:51:53 +0200 | [diff] [blame] | 1512 | } |
| 1513 | |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1514 | static void perf_group_detach(struct perf_event *event) |
Peter Zijlstra | 050735b | 2010-05-11 11:51:53 +0200 | [diff] [blame] | 1515 | { |
| 1516 | struct perf_event *sibling, *tmp; |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1517 | struct list_head *list = NULL; |
| 1518 | |
| 1519 | /* |
| 1520 | * We can have double detach due to exit/hot-unplug + close. |
| 1521 | */ |
| 1522 | if (!(event->attach_state & PERF_ATTACH_GROUP)) |
| 1523 | return; |
| 1524 | |
| 1525 | event->attach_state &= ~PERF_ATTACH_GROUP; |
| 1526 | |
| 1527 | /* |
| 1528 | * If this is a sibling, remove it from its group. |
| 1529 | */ |
| 1530 | if (event->group_leader != event) { |
| 1531 | list_del_init(&event->group_entry); |
| 1532 | event->group_leader->nr_siblings--; |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 1533 | goto out; |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1534 | } |
| 1535 | |
| 1536 | if (!list_empty(&event->group_entry)) |
| 1537 | list = &event->group_entry; |
Peter Zijlstra | 2e2af50 | 2009-11-23 11:37:25 +0100 | [diff] [blame] | 1538 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1539 | /* |
| 1540 | * If this was a group event with sibling events then |
| 1541 | * upgrade the siblings to singleton events by adding them |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1542 | * to whatever list we are on. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1543 | */ |
| 1544 | list_for_each_entry_safe(sibling, tmp, &event->sibling_list, group_entry) { |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 1545 | if (list) |
| 1546 | list_move_tail(&sibling->group_entry, list); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1547 | sibling->group_leader = sibling; |
Frederic Weisbecker | d6f962b | 2010-01-10 01:25:51 +0100 | [diff] [blame] | 1548 | |
| 1549 | /* Inherit group flags from the previous leader */ |
| 1550 | sibling->group_flags = event->group_flags; |
Peter Zijlstra | 652884f | 2015-01-23 11:20:10 +0100 | [diff] [blame] | 1551 | |
| 1552 | WARN_ON_ONCE(sibling->ctx != event->ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1553 | } |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 1554 | |
| 1555 | out: |
| 1556 | perf_event__header_size(event->group_leader); |
| 1557 | |
| 1558 | list_for_each_entry(tmp, &event->group_leader->sibling_list, group_entry) |
| 1559 | perf_event__header_size(tmp); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1560 | } |
| 1561 | |
Jiri Olsa | fadfe7b | 2014-08-01 14:33:02 +0200 | [diff] [blame] | 1562 | /* |
| 1563 | * User event without the task. |
| 1564 | */ |
| 1565 | static bool is_orphaned_event(struct perf_event *event) |
| 1566 | { |
| 1567 | return event && !is_kernel_event(event) && !event->owner; |
| 1568 | } |
| 1569 | |
| 1570 | /* |
| 1571 | * Event has a parent but parent's task finished and it's |
| 1572 | * alive only because of children holding refference. |
| 1573 | */ |
| 1574 | static bool is_orphaned_child(struct perf_event *event) |
| 1575 | { |
| 1576 | return is_orphaned_event(event->parent); |
| 1577 | } |
| 1578 | |
| 1579 | static void orphans_remove_work(struct work_struct *work); |
| 1580 | |
| 1581 | static void schedule_orphans_remove(struct perf_event_context *ctx) |
| 1582 | { |
| 1583 | if (!ctx->task || ctx->orphans_remove_sched || !perf_wq) |
| 1584 | return; |
| 1585 | |
| 1586 | if (queue_delayed_work(perf_wq, &ctx->orphans_remove, 1)) { |
| 1587 | get_ctx(ctx); |
| 1588 | ctx->orphans_remove_sched = true; |
| 1589 | } |
| 1590 | } |
| 1591 | |
| 1592 | static int __init perf_workqueue_init(void) |
| 1593 | { |
| 1594 | perf_wq = create_singlethread_workqueue("perf"); |
| 1595 | WARN(!perf_wq, "failed to create perf workqueue\n"); |
| 1596 | return perf_wq ? 0 : -1; |
| 1597 | } |
| 1598 | |
| 1599 | core_initcall(perf_workqueue_init); |
| 1600 | |
Mark Rutland | 66eb579 | 2015-05-13 17:12:23 +0100 | [diff] [blame] | 1601 | static inline int pmu_filter_match(struct perf_event *event) |
| 1602 | { |
| 1603 | struct pmu *pmu = event->pmu; |
| 1604 | return pmu->filter_match ? pmu->filter_match(event) : 1; |
| 1605 | } |
| 1606 | |
Stephane Eranian | fa66f07 | 2010-08-26 16:40:01 +0200 | [diff] [blame] | 1607 | static inline int |
| 1608 | event_filter_match(struct perf_event *event) |
| 1609 | { |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 1610 | return (event->cpu == -1 || event->cpu == smp_processor_id()) |
Mark Rutland | 66eb579 | 2015-05-13 17:12:23 +0100 | [diff] [blame] | 1611 | && perf_cgroup_match(event) && pmu_filter_match(event); |
Stephane Eranian | fa66f07 | 2010-08-26 16:40:01 +0200 | [diff] [blame] | 1612 | } |
| 1613 | |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 1614 | static void |
| 1615 | event_sched_out(struct perf_event *event, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1616 | struct perf_cpu_context *cpuctx, |
| 1617 | struct perf_event_context *ctx) |
| 1618 | { |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1619 | u64 tstamp = perf_event_time(event); |
Stephane Eranian | fa66f07 | 2010-08-26 16:40:01 +0200 | [diff] [blame] | 1620 | u64 delta; |
Peter Zijlstra | 652884f | 2015-01-23 11:20:10 +0100 | [diff] [blame] | 1621 | |
| 1622 | WARN_ON_ONCE(event->ctx != ctx); |
| 1623 | lockdep_assert_held(&ctx->lock); |
| 1624 | |
Stephane Eranian | fa66f07 | 2010-08-26 16:40:01 +0200 | [diff] [blame] | 1625 | /* |
| 1626 | * An event which could not be activated because of |
| 1627 | * filter mismatch still needs to have its timings |
| 1628 | * maintained, otherwise bogus information is return |
| 1629 | * via read() for time_enabled, time_running: |
| 1630 | */ |
| 1631 | if (event->state == PERF_EVENT_STATE_INACTIVE |
| 1632 | && !event_filter_match(event)) { |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 1633 | delta = tstamp - event->tstamp_stopped; |
Stephane Eranian | fa66f07 | 2010-08-26 16:40:01 +0200 | [diff] [blame] | 1634 | event->tstamp_running += delta; |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1635 | event->tstamp_stopped = tstamp; |
Stephane Eranian | fa66f07 | 2010-08-26 16:40:01 +0200 | [diff] [blame] | 1636 | } |
| 1637 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1638 | if (event->state != PERF_EVENT_STATE_ACTIVE) |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 1639 | return; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1640 | |
Alexander Shishkin | 4437727 | 2013-12-16 14:17:36 +0200 | [diff] [blame] | 1641 | perf_pmu_disable(event->pmu); |
| 1642 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1643 | event->state = PERF_EVENT_STATE_INACTIVE; |
| 1644 | if (event->pending_disable) { |
| 1645 | event->pending_disable = 0; |
| 1646 | event->state = PERF_EVENT_STATE_OFF; |
| 1647 | } |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1648 | event->tstamp_stopped = tstamp; |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 1649 | event->pmu->del(event, 0); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1650 | event->oncpu = -1; |
| 1651 | |
| 1652 | if (!is_software_event(event)) |
| 1653 | cpuctx->active_oncpu--; |
Mark Rutland | 2fde4f9 | 2015-01-07 15:01:54 +0000 | [diff] [blame] | 1654 | if (!--ctx->nr_active) |
| 1655 | perf_event_ctx_deactivate(ctx); |
Peter Zijlstra | 0f5a260 | 2011-11-16 14:38:16 +0100 | [diff] [blame] | 1656 | if (event->attr.freq && event->attr.sample_freq) |
| 1657 | ctx->nr_freq--; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1658 | if (event->attr.exclusive || !cpuctx->active_oncpu) |
| 1659 | cpuctx->exclusive = 0; |
Alexander Shishkin | 4437727 | 2013-12-16 14:17:36 +0200 | [diff] [blame] | 1660 | |
Jiri Olsa | fadfe7b | 2014-08-01 14:33:02 +0200 | [diff] [blame] | 1661 | if (is_orphaned_child(event)) |
| 1662 | schedule_orphans_remove(ctx); |
| 1663 | |
Alexander Shishkin | 4437727 | 2013-12-16 14:17:36 +0200 | [diff] [blame] | 1664 | perf_pmu_enable(event->pmu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1665 | } |
| 1666 | |
| 1667 | static void |
| 1668 | group_sched_out(struct perf_event *group_event, |
| 1669 | struct perf_cpu_context *cpuctx, |
| 1670 | struct perf_event_context *ctx) |
| 1671 | { |
| 1672 | struct perf_event *event; |
Stephane Eranian | fa66f07 | 2010-08-26 16:40:01 +0200 | [diff] [blame] | 1673 | int state = group_event->state; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1674 | |
| 1675 | event_sched_out(group_event, cpuctx, ctx); |
| 1676 | |
| 1677 | /* |
| 1678 | * Schedule out siblings (if any): |
| 1679 | */ |
| 1680 | list_for_each_entry(event, &group_event->sibling_list, group_entry) |
| 1681 | event_sched_out(event, cpuctx, ctx); |
| 1682 | |
Stephane Eranian | fa66f07 | 2010-08-26 16:40:01 +0200 | [diff] [blame] | 1683 | if (state == PERF_EVENT_STATE_ACTIVE && group_event->attr.exclusive) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1684 | cpuctx->exclusive = 0; |
| 1685 | } |
| 1686 | |
Peter Zijlstra | 46ce0fe | 2014-05-02 16:56:01 +0200 | [diff] [blame] | 1687 | struct remove_event { |
| 1688 | struct perf_event *event; |
| 1689 | bool detach_group; |
| 1690 | }; |
| 1691 | |
Peter Zijlstra | 0017960 | 2015-11-30 16:26:35 +0100 | [diff] [blame] | 1692 | static void ___perf_remove_from_context(void *info) |
| 1693 | { |
| 1694 | struct remove_event *re = info; |
| 1695 | struct perf_event *event = re->event; |
| 1696 | struct perf_event_context *ctx = event->ctx; |
| 1697 | |
| 1698 | if (re->detach_group) |
| 1699 | perf_group_detach(event); |
| 1700 | list_del_event(event, ctx); |
| 1701 | } |
| 1702 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1703 | /* |
| 1704 | * Cross CPU call to remove a performance event |
| 1705 | * |
| 1706 | * We disable the event on the hardware level first. After that we |
| 1707 | * remove it from the context list. |
| 1708 | */ |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 1709 | static int __perf_remove_from_context(void *info) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1710 | { |
Peter Zijlstra | 46ce0fe | 2014-05-02 16:56:01 +0200 | [diff] [blame] | 1711 | struct remove_event *re = info; |
| 1712 | struct perf_event *event = re->event; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1713 | struct perf_event_context *ctx = event->ctx; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 1714 | struct perf_cpu_context *cpuctx = __get_cpu_context(ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1715 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1716 | raw_spin_lock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1717 | event_sched_out(event, cpuctx, ctx); |
Peter Zijlstra | 46ce0fe | 2014-05-02 16:56:01 +0200 | [diff] [blame] | 1718 | if (re->detach_group) |
| 1719 | perf_group_detach(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1720 | list_del_event(event, ctx); |
Peter Zijlstra | 39a4364 | 2016-01-11 12:46:35 +0100 | [diff] [blame^] | 1721 | |
| 1722 | if (!ctx->nr_events && ctx->is_active) { |
Peter Zijlstra | 64ce312 | 2011-04-09 21:17:48 +0200 | [diff] [blame] | 1723 | ctx->is_active = 0; |
Peter Zijlstra | 39a4364 | 2016-01-11 12:46:35 +0100 | [diff] [blame^] | 1724 | if (ctx->task) { |
| 1725 | WARN_ON_ONCE(cpuctx->task_ctx != ctx); |
| 1726 | cpuctx->task_ctx = NULL; |
| 1727 | } |
Peter Zijlstra | 64ce312 | 2011-04-09 21:17:48 +0200 | [diff] [blame] | 1728 | } |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1729 | raw_spin_unlock(&ctx->lock); |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 1730 | |
| 1731 | return 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1732 | } |
| 1733 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1734 | /* |
| 1735 | * Remove the event from a task's (or a CPU's) list of events. |
| 1736 | * |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1737 | * CPU events are removed with a smp call. For task events we only |
| 1738 | * call when the task is on a CPU. |
| 1739 | * |
| 1740 | * If event->ctx is a cloned context, callers must make sure that |
| 1741 | * every task struct that event->ctx->task could possibly point to |
| 1742 | * remains valid. This is OK when called from perf_release since |
| 1743 | * that only calls us on the top-level context, which can't be a clone. |
| 1744 | * When called from perf_event_exit_task, it's OK because the |
| 1745 | * context has been detached from its task. |
| 1746 | */ |
Peter Zijlstra | 46ce0fe | 2014-05-02 16:56:01 +0200 | [diff] [blame] | 1747 | static void perf_remove_from_context(struct perf_event *event, bool detach_group) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1748 | { |
| 1749 | struct perf_event_context *ctx = event->ctx; |
Peter Zijlstra | 46ce0fe | 2014-05-02 16:56:01 +0200 | [diff] [blame] | 1750 | struct remove_event re = { |
| 1751 | .event = event, |
| 1752 | .detach_group = detach_group, |
| 1753 | }; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1754 | |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 1755 | lockdep_assert_held(&ctx->mutex); |
| 1756 | |
Peter Zijlstra | 0017960 | 2015-11-30 16:26:35 +0100 | [diff] [blame] | 1757 | event_function_call(event, __perf_remove_from_context, |
| 1758 | ___perf_remove_from_context, &re); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1759 | } |
| 1760 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1761 | /* |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1762 | * Cross CPU call to disable a performance event |
| 1763 | */ |
K.Prasad | 500ad2d | 2012-08-02 13:46:35 +0530 | [diff] [blame] | 1764 | int __perf_event_disable(void *info) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1765 | { |
| 1766 | struct perf_event *event = info; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1767 | struct perf_event_context *ctx = event->ctx; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 1768 | struct perf_cpu_context *cpuctx = __get_cpu_context(ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1769 | |
| 1770 | /* |
| 1771 | * If this is a per-task event, need to check whether this |
| 1772 | * event's task is the current task on this cpu. |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 1773 | * |
| 1774 | * Can trigger due to concurrent perf_event_context_sched_out() |
| 1775 | * flipping contexts around. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1776 | */ |
| 1777 | if (ctx->task && cpuctx->task_ctx != ctx) |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 1778 | return -EINVAL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1779 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1780 | raw_spin_lock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1781 | |
| 1782 | /* |
| 1783 | * If the event is on, turn it off. |
| 1784 | * If it is in error state, leave it in error state. |
| 1785 | */ |
| 1786 | if (event->state >= PERF_EVENT_STATE_INACTIVE) { |
| 1787 | update_context_time(ctx); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 1788 | update_cgrp_time_from_event(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1789 | update_group_times(event); |
| 1790 | if (event == event->group_leader) |
| 1791 | group_sched_out(event, cpuctx, ctx); |
| 1792 | else |
| 1793 | event_sched_out(event, cpuctx, ctx); |
| 1794 | event->state = PERF_EVENT_STATE_OFF; |
| 1795 | } |
| 1796 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1797 | raw_spin_unlock(&ctx->lock); |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 1798 | |
| 1799 | return 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1800 | } |
| 1801 | |
Peter Zijlstra | 7b64801 | 2015-12-03 18:35:21 +0100 | [diff] [blame] | 1802 | void ___perf_event_disable(void *info) |
| 1803 | { |
| 1804 | struct perf_event *event = info; |
| 1805 | |
| 1806 | /* |
| 1807 | * Since we have the lock this context can't be scheduled |
| 1808 | * in, so we can change the state safely. |
| 1809 | */ |
| 1810 | if (event->state == PERF_EVENT_STATE_INACTIVE) { |
| 1811 | update_group_times(event); |
| 1812 | event->state = PERF_EVENT_STATE_OFF; |
| 1813 | } |
| 1814 | } |
| 1815 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1816 | /* |
| 1817 | * Disable a event. |
| 1818 | * |
| 1819 | * If event->ctx is a cloned context, callers must make sure that |
| 1820 | * every task struct that event->ctx->task could possibly point to |
| 1821 | * remains valid. This condition is satisifed when called through |
| 1822 | * perf_event_for_each_child or perf_event_for_each because they |
| 1823 | * hold the top-level event's child_mutex, so any descendant that |
| 1824 | * goes to exit will block in sync_child_event. |
| 1825 | * When called from perf_pending_event it's OK because event->ctx |
| 1826 | * is the current context on this CPU and preemption is disabled, |
| 1827 | * hence we can't get into perf_event_task_sched_out for this context. |
| 1828 | */ |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 1829 | static void _perf_event_disable(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1830 | { |
| 1831 | struct perf_event_context *ctx = event->ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1832 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1833 | raw_spin_lock_irq(&ctx->lock); |
Peter Zijlstra | 7b64801 | 2015-12-03 18:35:21 +0100 | [diff] [blame] | 1834 | if (event->state <= PERF_EVENT_STATE_OFF) { |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1835 | raw_spin_unlock_irq(&ctx->lock); |
Peter Zijlstra | 7b64801 | 2015-12-03 18:35:21 +0100 | [diff] [blame] | 1836 | return; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1837 | } |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1838 | raw_spin_unlock_irq(&ctx->lock); |
Peter Zijlstra | 7b64801 | 2015-12-03 18:35:21 +0100 | [diff] [blame] | 1839 | |
| 1840 | event_function_call(event, __perf_event_disable, |
| 1841 | ___perf_event_disable, event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1842 | } |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 1843 | |
| 1844 | /* |
| 1845 | * Strictly speaking kernel users cannot create groups and therefore this |
| 1846 | * interface does not need the perf_event_ctx_lock() magic. |
| 1847 | */ |
| 1848 | void perf_event_disable(struct perf_event *event) |
| 1849 | { |
| 1850 | struct perf_event_context *ctx; |
| 1851 | |
| 1852 | ctx = perf_event_ctx_lock(event); |
| 1853 | _perf_event_disable(event); |
| 1854 | perf_event_ctx_unlock(event, ctx); |
| 1855 | } |
Robert Richter | dcfce4a | 2011-10-11 17:11:08 +0200 | [diff] [blame] | 1856 | EXPORT_SYMBOL_GPL(perf_event_disable); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1857 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 1858 | static void perf_set_shadow_time(struct perf_event *event, |
| 1859 | struct perf_event_context *ctx, |
| 1860 | u64 tstamp) |
| 1861 | { |
| 1862 | /* |
| 1863 | * use the correct time source for the time snapshot |
| 1864 | * |
| 1865 | * We could get by without this by leveraging the |
| 1866 | * fact that to get to this function, the caller |
| 1867 | * has most likely already called update_context_time() |
| 1868 | * and update_cgrp_time_xx() and thus both timestamp |
| 1869 | * are identical (or very close). Given that tstamp is, |
| 1870 | * already adjusted for cgroup, we could say that: |
| 1871 | * tstamp - ctx->timestamp |
| 1872 | * is equivalent to |
| 1873 | * tstamp - cgrp->timestamp. |
| 1874 | * |
| 1875 | * Then, in perf_output_read(), the calculation would |
| 1876 | * work with no changes because: |
| 1877 | * - event is guaranteed scheduled in |
| 1878 | * - no scheduled out in between |
| 1879 | * - thus the timestamp would be the same |
| 1880 | * |
| 1881 | * But this is a bit hairy. |
| 1882 | * |
| 1883 | * So instead, we have an explicit cgroup call to remain |
| 1884 | * within the time time source all along. We believe it |
| 1885 | * is cleaner and simpler to understand. |
| 1886 | */ |
| 1887 | if (is_cgroup_event(event)) |
| 1888 | perf_cgroup_set_shadow_time(event, tstamp); |
| 1889 | else |
| 1890 | event->shadow_ctx_time = tstamp - ctx->timestamp; |
| 1891 | } |
| 1892 | |
Peter Zijlstra | 4fe757d | 2011-02-15 22:26:07 +0100 | [diff] [blame] | 1893 | #define MAX_INTERRUPTS (~0ULL) |
| 1894 | |
| 1895 | static void perf_log_throttle(struct perf_event *event, int enable); |
Alexander Shishkin | ec0d772 | 2015-01-14 14:18:23 +0200 | [diff] [blame] | 1896 | static void perf_log_itrace_start(struct perf_event *event); |
Peter Zijlstra | 4fe757d | 2011-02-15 22:26:07 +0100 | [diff] [blame] | 1897 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1898 | static int |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 1899 | event_sched_in(struct perf_event *event, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1900 | struct perf_cpu_context *cpuctx, |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 1901 | struct perf_event_context *ctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1902 | { |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1903 | u64 tstamp = perf_event_time(event); |
Alexander Shishkin | 4437727 | 2013-12-16 14:17:36 +0200 | [diff] [blame] | 1904 | int ret = 0; |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1905 | |
Peter Zijlstra | 6334241 | 2014-05-05 11:49:16 +0200 | [diff] [blame] | 1906 | lockdep_assert_held(&ctx->lock); |
| 1907 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1908 | if (event->state <= PERF_EVENT_STATE_OFF) |
| 1909 | return 0; |
| 1910 | |
| 1911 | event->state = PERF_EVENT_STATE_ACTIVE; |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 1912 | event->oncpu = smp_processor_id(); |
Peter Zijlstra | 4fe757d | 2011-02-15 22:26:07 +0100 | [diff] [blame] | 1913 | |
| 1914 | /* |
| 1915 | * Unthrottle events, since we scheduled we might have missed several |
| 1916 | * ticks already, also for a heavily scheduling task there is little |
| 1917 | * guarantee it'll get a tick in a timely manner. |
| 1918 | */ |
| 1919 | if (unlikely(event->hw.interrupts == MAX_INTERRUPTS)) { |
| 1920 | perf_log_throttle(event, 1); |
| 1921 | event->hw.interrupts = 0; |
| 1922 | } |
| 1923 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1924 | /* |
| 1925 | * The new state must be visible before we turn it on in the hardware: |
| 1926 | */ |
| 1927 | smp_wmb(); |
| 1928 | |
Alexander Shishkin | 4437727 | 2013-12-16 14:17:36 +0200 | [diff] [blame] | 1929 | perf_pmu_disable(event->pmu); |
| 1930 | |
Shaohua Li | 72f669c | 2015-02-05 15:55:31 -0800 | [diff] [blame] | 1931 | perf_set_shadow_time(event, ctx, tstamp); |
| 1932 | |
Alexander Shishkin | ec0d772 | 2015-01-14 14:18:23 +0200 | [diff] [blame] | 1933 | perf_log_itrace_start(event); |
| 1934 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 1935 | if (event->pmu->add(event, PERF_EF_START)) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1936 | event->state = PERF_EVENT_STATE_INACTIVE; |
| 1937 | event->oncpu = -1; |
Alexander Shishkin | 4437727 | 2013-12-16 14:17:36 +0200 | [diff] [blame] | 1938 | ret = -EAGAIN; |
| 1939 | goto out; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1940 | } |
| 1941 | |
Peter Zijlstra | 00a2916 | 2015-07-27 10:35:07 +0200 | [diff] [blame] | 1942 | event->tstamp_running += tstamp - event->tstamp_stopped; |
| 1943 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1944 | if (!is_software_event(event)) |
| 1945 | cpuctx->active_oncpu++; |
Mark Rutland | 2fde4f9 | 2015-01-07 15:01:54 +0000 | [diff] [blame] | 1946 | if (!ctx->nr_active++) |
| 1947 | perf_event_ctx_activate(ctx); |
Peter Zijlstra | 0f5a260 | 2011-11-16 14:38:16 +0100 | [diff] [blame] | 1948 | if (event->attr.freq && event->attr.sample_freq) |
| 1949 | ctx->nr_freq++; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1950 | |
| 1951 | if (event->attr.exclusive) |
| 1952 | cpuctx->exclusive = 1; |
| 1953 | |
Jiri Olsa | fadfe7b | 2014-08-01 14:33:02 +0200 | [diff] [blame] | 1954 | if (is_orphaned_child(event)) |
| 1955 | schedule_orphans_remove(ctx); |
| 1956 | |
Alexander Shishkin | 4437727 | 2013-12-16 14:17:36 +0200 | [diff] [blame] | 1957 | out: |
| 1958 | perf_pmu_enable(event->pmu); |
| 1959 | |
| 1960 | return ret; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1961 | } |
| 1962 | |
| 1963 | static int |
| 1964 | group_sched_in(struct perf_event *group_event, |
| 1965 | struct perf_cpu_context *cpuctx, |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 1966 | struct perf_event_context *ctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1967 | { |
Lin Ming | 6bde9b6 | 2010-04-23 13:56:00 +0800 | [diff] [blame] | 1968 | struct perf_event *event, *partial_group = NULL; |
Peter Zijlstra | 4a23459 | 2014-02-24 12:43:31 +0100 | [diff] [blame] | 1969 | struct pmu *pmu = ctx->pmu; |
Stephane Eranian | d7842da | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 1970 | u64 now = ctx->time; |
| 1971 | bool simulate = false; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1972 | |
| 1973 | if (group_event->state == PERF_EVENT_STATE_OFF) |
| 1974 | return 0; |
| 1975 | |
Sukadev Bhattiprolu | fbbe070 | 2015-09-03 20:07:45 -0700 | [diff] [blame] | 1976 | pmu->start_txn(pmu, PERF_PMU_TXN_ADD); |
Lin Ming | 6bde9b6 | 2010-04-23 13:56:00 +0800 | [diff] [blame] | 1977 | |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 1978 | if (event_sched_in(group_event, cpuctx, ctx)) { |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 1979 | pmu->cancel_txn(pmu); |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 1980 | perf_mux_hrtimer_restart(cpuctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1981 | return -EAGAIN; |
Stephane Eranian | 90151c35 | 2010-05-25 16:23:10 +0200 | [diff] [blame] | 1982 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1983 | |
| 1984 | /* |
| 1985 | * Schedule in siblings as one group (if any): |
| 1986 | */ |
| 1987 | list_for_each_entry(event, &group_event->sibling_list, group_entry) { |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 1988 | if (event_sched_in(event, cpuctx, ctx)) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1989 | partial_group = event; |
| 1990 | goto group_error; |
| 1991 | } |
| 1992 | } |
| 1993 | |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 1994 | if (!pmu->commit_txn(pmu)) |
Paul Mackerras | 6e85158 | 2010-05-08 20:58:00 +1000 | [diff] [blame] | 1995 | return 0; |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 1996 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1997 | group_error: |
| 1998 | /* |
| 1999 | * Groups can be scheduled in as one unit only, so undo any |
| 2000 | * partial group before returning: |
Stephane Eranian | d7842da | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 2001 | * The events up to the failed event are scheduled out normally, |
| 2002 | * tstamp_stopped will be updated. |
| 2003 | * |
| 2004 | * The failed events and the remaining siblings need to have |
| 2005 | * their timings updated as if they had gone thru event_sched_in() |
| 2006 | * and event_sched_out(). This is required to get consistent timings |
| 2007 | * across the group. This also takes care of the case where the group |
| 2008 | * could never be scheduled by ensuring tstamp_stopped is set to mark |
| 2009 | * the time the event was actually stopped, such that time delta |
| 2010 | * calculation in update_event_times() is correct. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2011 | */ |
| 2012 | list_for_each_entry(event, &group_event->sibling_list, group_entry) { |
| 2013 | if (event == partial_group) |
Stephane Eranian | d7842da | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 2014 | simulate = true; |
| 2015 | |
| 2016 | if (simulate) { |
| 2017 | event->tstamp_running += now - event->tstamp_stopped; |
| 2018 | event->tstamp_stopped = now; |
| 2019 | } else { |
| 2020 | event_sched_out(event, cpuctx, ctx); |
| 2021 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2022 | } |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 2023 | event_sched_out(group_event, cpuctx, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2024 | |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 2025 | pmu->cancel_txn(pmu); |
Stephane Eranian | 90151c35 | 2010-05-25 16:23:10 +0200 | [diff] [blame] | 2026 | |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 2027 | perf_mux_hrtimer_restart(cpuctx); |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 2028 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2029 | return -EAGAIN; |
| 2030 | } |
| 2031 | |
| 2032 | /* |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2033 | * Work out whether we can put this event group on the CPU now. |
| 2034 | */ |
| 2035 | static int group_can_go_on(struct perf_event *event, |
| 2036 | struct perf_cpu_context *cpuctx, |
| 2037 | int can_add_hw) |
| 2038 | { |
| 2039 | /* |
| 2040 | * Groups consisting entirely of software events can always go on. |
| 2041 | */ |
Frederic Weisbecker | d6f962b | 2010-01-10 01:25:51 +0100 | [diff] [blame] | 2042 | if (event->group_flags & PERF_GROUP_SOFTWARE) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2043 | return 1; |
| 2044 | /* |
| 2045 | * If an exclusive group is already on, no other hardware |
| 2046 | * events can go on. |
| 2047 | */ |
| 2048 | if (cpuctx->exclusive) |
| 2049 | return 0; |
| 2050 | /* |
| 2051 | * If this group is exclusive and there are already |
| 2052 | * events on the CPU, it can't go on. |
| 2053 | */ |
| 2054 | if (event->attr.exclusive && cpuctx->active_oncpu) |
| 2055 | return 0; |
| 2056 | /* |
| 2057 | * Otherwise, try to add it if all previous groups were able |
| 2058 | * to go on. |
| 2059 | */ |
| 2060 | return can_add_hw; |
| 2061 | } |
| 2062 | |
| 2063 | static void add_event_to_ctx(struct perf_event *event, |
| 2064 | struct perf_event_context *ctx) |
| 2065 | { |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 2066 | u64 tstamp = perf_event_time(event); |
| 2067 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2068 | list_add_event(event, ctx); |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 2069 | perf_group_attach(event); |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 2070 | event->tstamp_enabled = tstamp; |
| 2071 | event->tstamp_running = tstamp; |
| 2072 | event->tstamp_stopped = tstamp; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2073 | } |
| 2074 | |
Peter Zijlstra | 3e34950 | 2016-01-08 10:01:18 +0100 | [diff] [blame] | 2075 | static void task_ctx_sched_out(struct perf_cpu_context *cpuctx, |
| 2076 | struct perf_event_context *ctx); |
Peter Zijlstra | 2c29ef0 | 2011-04-09 21:17:44 +0200 | [diff] [blame] | 2077 | static void |
| 2078 | ctx_sched_in(struct perf_event_context *ctx, |
| 2079 | struct perf_cpu_context *cpuctx, |
| 2080 | enum event_type_t event_type, |
| 2081 | struct task_struct *task); |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 2082 | |
Peter Zijlstra | dce5855 | 2011-04-09 21:17:46 +0200 | [diff] [blame] | 2083 | static void perf_event_sched_in(struct perf_cpu_context *cpuctx, |
| 2084 | struct perf_event_context *ctx, |
| 2085 | struct task_struct *task) |
| 2086 | { |
| 2087 | cpu_ctx_sched_in(cpuctx, EVENT_PINNED, task); |
| 2088 | if (ctx) |
| 2089 | ctx_sched_in(ctx, cpuctx, EVENT_PINNED, task); |
| 2090 | cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE, task); |
| 2091 | if (ctx) |
| 2092 | ctx_sched_in(ctx, cpuctx, EVENT_FLEXIBLE, task); |
| 2093 | } |
| 2094 | |
Peter Zijlstra | 3e34950 | 2016-01-08 10:01:18 +0100 | [diff] [blame] | 2095 | static void ctx_resched(struct perf_cpu_context *cpuctx, |
| 2096 | struct perf_event_context *task_ctx) |
| 2097 | { |
| 2098 | perf_pmu_disable(cpuctx->ctx.pmu); |
| 2099 | if (task_ctx) |
| 2100 | task_ctx_sched_out(cpuctx, task_ctx); |
| 2101 | cpu_ctx_sched_out(cpuctx, EVENT_ALL); |
| 2102 | perf_event_sched_in(cpuctx, task_ctx, current); |
| 2103 | perf_pmu_enable(cpuctx->ctx.pmu); |
| 2104 | } |
| 2105 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2106 | /* |
| 2107 | * Cross CPU call to install and enable a performance event |
| 2108 | * |
| 2109 | * Must be called with ctx->mutex held |
| 2110 | */ |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 2111 | static int __perf_install_in_context(void *info) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2112 | { |
Peter Zijlstra | 39a4364 | 2016-01-11 12:46:35 +0100 | [diff] [blame^] | 2113 | struct perf_event_context *ctx = info; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 2114 | struct perf_cpu_context *cpuctx = __get_cpu_context(ctx); |
Peter Zijlstra | 2c29ef0 | 2011-04-09 21:17:44 +0200 | [diff] [blame] | 2115 | struct perf_event_context *task_ctx = cpuctx->task_ctx; |
Peter Zijlstra | 2c29ef0 | 2011-04-09 21:17:44 +0200 | [diff] [blame] | 2116 | |
Peter Zijlstra | 39a4364 | 2016-01-11 12:46:35 +0100 | [diff] [blame^] | 2117 | if (ctx->task) { |
| 2118 | /* |
| 2119 | * If we hit the 'wrong' task, we've since scheduled and |
| 2120 | * everything should be sorted, nothing to do! |
| 2121 | */ |
| 2122 | if (ctx->task != current) |
| 2123 | return 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2124 | |
Peter Zijlstra | 39a4364 | 2016-01-11 12:46:35 +0100 | [diff] [blame^] | 2125 | /* |
| 2126 | * If task_ctx is set, it had better be to us. |
| 2127 | */ |
| 2128 | WARN_ON_ONCE(cpuctx->task_ctx != ctx && cpuctx->task_ctx); |
Peter Zijlstra | b58f6b0 | 2011-06-07 00:23:28 +0200 | [diff] [blame] | 2129 | task_ctx = ctx; |
| 2130 | } |
| 2131 | |
Peter Zijlstra | 39a4364 | 2016-01-11 12:46:35 +0100 | [diff] [blame^] | 2132 | perf_ctx_lock(cpuctx, task_ctx); |
| 2133 | ctx_resched(cpuctx, task_ctx); |
Peter Zijlstra | 2c29ef0 | 2011-04-09 21:17:44 +0200 | [diff] [blame] | 2134 | perf_ctx_unlock(cpuctx, task_ctx); |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 2135 | |
| 2136 | return 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2137 | } |
| 2138 | |
| 2139 | /* |
| 2140 | * Attach a performance event to a context |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2141 | */ |
| 2142 | static void |
| 2143 | perf_install_in_context(struct perf_event_context *ctx, |
| 2144 | struct perf_event *event, |
| 2145 | int cpu) |
| 2146 | { |
Peter Zijlstra | 39a4364 | 2016-01-11 12:46:35 +0100 | [diff] [blame^] | 2147 | struct task_struct *task = NULL; |
| 2148 | |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 2149 | lockdep_assert_held(&ctx->mutex); |
| 2150 | |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 2151 | event->ctx = ctx; |
Yan, Zheng | 0cda4c0 | 2012-06-15 14:31:33 +0800 | [diff] [blame] | 2152 | if (event->cpu != -1) |
| 2153 | event->cpu = cpu; |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 2154 | |
Peter Zijlstra | 39a4364 | 2016-01-11 12:46:35 +0100 | [diff] [blame^] | 2155 | /* |
| 2156 | * Installing events is tricky because we cannot rely on ctx->is_active |
| 2157 | * to be set in case this is the nr_events 0 -> 1 transition. |
| 2158 | * |
| 2159 | * So what we do is we add the event to the list here, which will allow |
| 2160 | * a future context switch to DTRT and then send a racy IPI. If the IPI |
| 2161 | * fails to hit the right task, this means a context switch must have |
| 2162 | * happened and that will have taken care of business. |
| 2163 | */ |
| 2164 | raw_spin_lock_irq(&ctx->lock); |
| 2165 | update_context_time(ctx); |
| 2166 | /* |
| 2167 | * Update cgrp time only if current cgrp matches event->cgrp. |
| 2168 | * Must be done before calling add_event_to_ctx(). |
| 2169 | */ |
| 2170 | update_cgrp_time_from_event(event); |
| 2171 | add_event_to_ctx(event, ctx); |
| 2172 | task = ctx->task; |
| 2173 | raw_spin_unlock_irq(&ctx->lock); |
| 2174 | |
| 2175 | if (task) |
| 2176 | task_function_call(task, __perf_install_in_context, ctx); |
| 2177 | else |
| 2178 | cpu_function_call(cpu, __perf_install_in_context, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2179 | } |
| 2180 | |
| 2181 | /* |
| 2182 | * Put a event into inactive state and update time fields. |
| 2183 | * Enabling the leader of a group effectively enables all |
| 2184 | * the group members that aren't explicitly disabled, so we |
| 2185 | * have to update their ->tstamp_enabled also. |
| 2186 | * Note: this works for group members as well as group leaders |
| 2187 | * since the non-leader members' sibling_lists will be empty. |
| 2188 | */ |
Peter Zijlstra | 1d9b482 | 2011-11-23 12:34:20 +0100 | [diff] [blame] | 2189 | static void __perf_event_mark_enabled(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2190 | { |
| 2191 | struct perf_event *sub; |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 2192 | u64 tstamp = perf_event_time(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2193 | |
| 2194 | event->state = PERF_EVENT_STATE_INACTIVE; |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 2195 | event->tstamp_enabled = tstamp - event->total_time_enabled; |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 2196 | list_for_each_entry(sub, &event->sibling_list, group_entry) { |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 2197 | if (sub->state >= PERF_EVENT_STATE_INACTIVE) |
| 2198 | sub->tstamp_enabled = tstamp - sub->total_time_enabled; |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 2199 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2200 | } |
| 2201 | |
| 2202 | /* |
| 2203 | * Cross CPU call to enable a performance event |
| 2204 | */ |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 2205 | static int __perf_event_enable(void *info) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2206 | { |
| 2207 | struct perf_event *event = info; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2208 | struct perf_event_context *ctx = event->ctx; |
| 2209 | struct perf_event *leader = event->group_leader; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 2210 | struct perf_cpu_context *cpuctx = __get_cpu_context(ctx); |
Peter Zijlstra | aee7dbc | 2016-01-08 10:45:11 +0100 | [diff] [blame] | 2211 | struct perf_event_context *task_ctx = cpuctx->task_ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2212 | |
Jiri Olsa | 06f4179 | 2013-07-09 17:44:11 +0200 | [diff] [blame] | 2213 | /* |
| 2214 | * There's a time window between 'ctx->is_active' check |
| 2215 | * in perf_event_enable function and this place having: |
| 2216 | * - IRQs on |
| 2217 | * - ctx->lock unlocked |
| 2218 | * |
| 2219 | * where the task could be killed and 'ctx' deactivated |
| 2220 | * by perf_event_exit_task. |
| 2221 | */ |
| 2222 | if (!ctx->is_active) |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 2223 | return -EINVAL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2224 | |
Peter Zijlstra | aee7dbc | 2016-01-08 10:45:11 +0100 | [diff] [blame] | 2225 | perf_ctx_lock(cpuctx, task_ctx); |
| 2226 | WARN_ON_ONCE(&cpuctx->ctx != ctx && task_ctx != ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2227 | update_context_time(ctx); |
| 2228 | |
| 2229 | if (event->state >= PERF_EVENT_STATE_INACTIVE) |
| 2230 | goto unlock; |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2231 | |
| 2232 | /* |
| 2233 | * set current task's cgroup time reference point |
| 2234 | */ |
Stephane Eranian | 3f7cce3 | 2011-02-18 14:40:01 +0200 | [diff] [blame] | 2235 | perf_cgroup_set_timestamp(current, ctx); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2236 | |
Peter Zijlstra | 1d9b482 | 2011-11-23 12:34:20 +0100 | [diff] [blame] | 2237 | __perf_event_mark_enabled(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2238 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2239 | if (!event_filter_match(event)) { |
| 2240 | if (is_cgroup_event(event)) |
| 2241 | perf_cgroup_defer_enabled(event); |
Peter Zijlstra | f4c4176 | 2009-12-16 17:55:54 +0100 | [diff] [blame] | 2242 | goto unlock; |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2243 | } |
Peter Zijlstra | f4c4176 | 2009-12-16 17:55:54 +0100 | [diff] [blame] | 2244 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2245 | /* |
| 2246 | * If the event is in a group and isn't the group leader, |
| 2247 | * then don't put it on unless the group is on. |
| 2248 | */ |
| 2249 | if (leader != event && leader->state != PERF_EVENT_STATE_ACTIVE) |
| 2250 | goto unlock; |
| 2251 | |
Peter Zijlstra | aee7dbc | 2016-01-08 10:45:11 +0100 | [diff] [blame] | 2252 | ctx_resched(cpuctx, task_ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2253 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 2254 | unlock: |
Peter Zijlstra | aee7dbc | 2016-01-08 10:45:11 +0100 | [diff] [blame] | 2255 | perf_ctx_unlock(cpuctx, task_ctx); |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 2256 | |
| 2257 | return 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2258 | } |
| 2259 | |
Peter Zijlstra | 7b64801 | 2015-12-03 18:35:21 +0100 | [diff] [blame] | 2260 | void ___perf_event_enable(void *info) |
| 2261 | { |
| 2262 | __perf_event_mark_enabled((struct perf_event *)info); |
| 2263 | } |
| 2264 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2265 | /* |
| 2266 | * Enable a event. |
| 2267 | * |
| 2268 | * If event->ctx is a cloned context, callers must make sure that |
| 2269 | * every task struct that event->ctx->task could possibly point to |
| 2270 | * remains valid. This condition is satisfied when called through |
| 2271 | * perf_event_for_each_child or perf_event_for_each as described |
| 2272 | * for perf_event_disable. |
| 2273 | */ |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 2274 | static void _perf_event_enable(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2275 | { |
| 2276 | struct perf_event_context *ctx = event->ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2277 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 2278 | raw_spin_lock_irq(&ctx->lock); |
Peter Zijlstra | 7b64801 | 2015-12-03 18:35:21 +0100 | [diff] [blame] | 2279 | if (event->state >= PERF_EVENT_STATE_INACTIVE) { |
| 2280 | raw_spin_unlock_irq(&ctx->lock); |
| 2281 | return; |
| 2282 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2283 | |
| 2284 | /* |
| 2285 | * If the event is in error state, clear that first. |
Peter Zijlstra | 7b64801 | 2015-12-03 18:35:21 +0100 | [diff] [blame] | 2286 | * |
| 2287 | * That way, if we see the event in error state below, we know that it |
| 2288 | * has gone back into error state, as distinct from the task having |
| 2289 | * been scheduled away before the cross-call arrived. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2290 | */ |
| 2291 | if (event->state == PERF_EVENT_STATE_ERROR) |
| 2292 | event->state = PERF_EVENT_STATE_OFF; |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 2293 | raw_spin_unlock_irq(&ctx->lock); |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 2294 | |
Peter Zijlstra | 7b64801 | 2015-12-03 18:35:21 +0100 | [diff] [blame] | 2295 | event_function_call(event, __perf_event_enable, |
| 2296 | ___perf_event_enable, event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2297 | } |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 2298 | |
| 2299 | /* |
| 2300 | * See perf_event_disable(); |
| 2301 | */ |
| 2302 | void perf_event_enable(struct perf_event *event) |
| 2303 | { |
| 2304 | struct perf_event_context *ctx; |
| 2305 | |
| 2306 | ctx = perf_event_ctx_lock(event); |
| 2307 | _perf_event_enable(event); |
| 2308 | perf_event_ctx_unlock(event, ctx); |
| 2309 | } |
Robert Richter | dcfce4a | 2011-10-11 17:11:08 +0200 | [diff] [blame] | 2310 | EXPORT_SYMBOL_GPL(perf_event_enable); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2311 | |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 2312 | static int _perf_event_refresh(struct perf_event *event, int refresh) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2313 | { |
| 2314 | /* |
| 2315 | * not supported on inherited events |
| 2316 | */ |
Franck Bui-Huu | 2e939d1 | 2010-11-23 16:21:44 +0100 | [diff] [blame] | 2317 | if (event->attr.inherit || !is_sampling_event(event)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2318 | return -EINVAL; |
| 2319 | |
| 2320 | atomic_add(refresh, &event->event_limit); |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 2321 | _perf_event_enable(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2322 | |
| 2323 | return 0; |
| 2324 | } |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 2325 | |
| 2326 | /* |
| 2327 | * See perf_event_disable() |
| 2328 | */ |
| 2329 | int perf_event_refresh(struct perf_event *event, int refresh) |
| 2330 | { |
| 2331 | struct perf_event_context *ctx; |
| 2332 | int ret; |
| 2333 | |
| 2334 | ctx = perf_event_ctx_lock(event); |
| 2335 | ret = _perf_event_refresh(event, refresh); |
| 2336 | perf_event_ctx_unlock(event, ctx); |
| 2337 | |
| 2338 | return ret; |
| 2339 | } |
Avi Kivity | 26ca5c1 | 2011-06-29 18:42:37 +0300 | [diff] [blame] | 2340 | EXPORT_SYMBOL_GPL(perf_event_refresh); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2341 | |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 2342 | static void ctx_sched_out(struct perf_event_context *ctx, |
| 2343 | struct perf_cpu_context *cpuctx, |
| 2344 | enum event_type_t event_type) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2345 | { |
Peter Zijlstra | db24d33 | 2011-04-09 21:17:45 +0200 | [diff] [blame] | 2346 | int is_active = ctx->is_active; |
Peter Zijlstra | c994d61 | 2016-01-08 09:20:23 +0100 | [diff] [blame] | 2347 | struct perf_event *event; |
| 2348 | |
| 2349 | lockdep_assert_held(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2350 | |
Peter Zijlstra | 39a4364 | 2016-01-11 12:46:35 +0100 | [diff] [blame^] | 2351 | if (likely(!ctx->nr_events)) { |
| 2352 | /* |
| 2353 | * See __perf_remove_from_context(). |
| 2354 | */ |
| 2355 | WARN_ON_ONCE(ctx->is_active); |
| 2356 | if (ctx->task) |
| 2357 | WARN_ON_ONCE(cpuctx->task_ctx); |
| 2358 | return; |
| 2359 | } |
| 2360 | |
Peter Zijlstra | db24d33 | 2011-04-09 21:17:45 +0200 | [diff] [blame] | 2361 | ctx->is_active &= ~event_type; |
Peter Zijlstra | 63e30d3 | 2016-01-08 11:39:10 +0100 | [diff] [blame] | 2362 | if (ctx->task) { |
| 2363 | WARN_ON_ONCE(cpuctx->task_ctx != ctx); |
| 2364 | if (!ctx->is_active) |
| 2365 | cpuctx->task_ctx = NULL; |
| 2366 | } |
| 2367 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2368 | update_context_time(ctx); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2369 | update_cgrp_time_from_cpuctx(cpuctx); |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 2370 | if (!ctx->nr_active) |
Peter Zijlstra | facc430 | 2011-04-09 21:17:42 +0200 | [diff] [blame] | 2371 | return; |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 2372 | |
Peter Zijlstra | 075e0b0 | 2011-04-09 21:17:40 +0200 | [diff] [blame] | 2373 | perf_pmu_disable(ctx->pmu); |
Peter Zijlstra | db24d33 | 2011-04-09 21:17:45 +0200 | [diff] [blame] | 2374 | if ((is_active & EVENT_PINNED) && (event_type & EVENT_PINNED)) { |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 2375 | list_for_each_entry(event, &ctx->pinned_groups, group_entry) |
| 2376 | group_sched_out(event, cpuctx, ctx); |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 2377 | } |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 2378 | |
Peter Zijlstra | db24d33 | 2011-04-09 21:17:45 +0200 | [diff] [blame] | 2379 | if ((is_active & EVENT_FLEXIBLE) && (event_type & EVENT_FLEXIBLE)) { |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 2380 | list_for_each_entry(event, &ctx->flexible_groups, group_entry) |
Xiao Guangrong | 8c9ed8e | 2009-09-25 13:51:17 +0800 | [diff] [blame] | 2381 | group_sched_out(event, cpuctx, ctx); |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 2382 | } |
Peter Zijlstra | 1b9a644 | 2010-09-07 18:32:22 +0200 | [diff] [blame] | 2383 | perf_pmu_enable(ctx->pmu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2384 | } |
| 2385 | |
| 2386 | /* |
Peter Zijlstra | 5a3126d | 2013-10-07 17:12:48 +0200 | [diff] [blame] | 2387 | * Test whether two contexts are equivalent, i.e. whether they have both been |
| 2388 | * cloned from the same version of the same context. |
| 2389 | * |
| 2390 | * Equivalence is measured using a generation number in the context that is |
| 2391 | * incremented on each modification to it; see unclone_ctx(), list_add_event() |
| 2392 | * and list_del_event(). |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2393 | */ |
| 2394 | static int context_equiv(struct perf_event_context *ctx1, |
| 2395 | struct perf_event_context *ctx2) |
| 2396 | { |
Peter Zijlstra | 211de6e | 2014-09-30 19:23:08 +0200 | [diff] [blame] | 2397 | lockdep_assert_held(&ctx1->lock); |
| 2398 | lockdep_assert_held(&ctx2->lock); |
| 2399 | |
Peter Zijlstra | 5a3126d | 2013-10-07 17:12:48 +0200 | [diff] [blame] | 2400 | /* Pinning disables the swap optimization */ |
| 2401 | if (ctx1->pin_count || ctx2->pin_count) |
| 2402 | return 0; |
| 2403 | |
| 2404 | /* If ctx1 is the parent of ctx2 */ |
| 2405 | if (ctx1 == ctx2->parent_ctx && ctx1->generation == ctx2->parent_gen) |
| 2406 | return 1; |
| 2407 | |
| 2408 | /* If ctx2 is the parent of ctx1 */ |
| 2409 | if (ctx1->parent_ctx == ctx2 && ctx1->parent_gen == ctx2->generation) |
| 2410 | return 1; |
| 2411 | |
| 2412 | /* |
| 2413 | * If ctx1 and ctx2 have the same parent; we flatten the parent |
| 2414 | * hierarchy, see perf_event_init_context(). |
| 2415 | */ |
| 2416 | if (ctx1->parent_ctx && ctx1->parent_ctx == ctx2->parent_ctx && |
| 2417 | ctx1->parent_gen == ctx2->parent_gen) |
| 2418 | return 1; |
| 2419 | |
| 2420 | /* Unmatched */ |
| 2421 | return 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2422 | } |
| 2423 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2424 | static void __perf_event_sync_stat(struct perf_event *event, |
| 2425 | struct perf_event *next_event) |
| 2426 | { |
| 2427 | u64 value; |
| 2428 | |
| 2429 | if (!event->attr.inherit_stat) |
| 2430 | return; |
| 2431 | |
| 2432 | /* |
| 2433 | * Update the event value, we cannot use perf_event_read() |
| 2434 | * because we're in the middle of a context switch and have IRQs |
| 2435 | * disabled, which upsets smp_call_function_single(), however |
| 2436 | * we know the event must be on the current CPU, therefore we |
| 2437 | * don't need to use it. |
| 2438 | */ |
| 2439 | switch (event->state) { |
| 2440 | case PERF_EVENT_STATE_ACTIVE: |
Peter Zijlstra | 3dbebf1 | 2009-11-20 22:19:52 +0100 | [diff] [blame] | 2441 | event->pmu->read(event); |
| 2442 | /* fall-through */ |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2443 | |
| 2444 | case PERF_EVENT_STATE_INACTIVE: |
| 2445 | update_event_times(event); |
| 2446 | break; |
| 2447 | |
| 2448 | default: |
| 2449 | break; |
| 2450 | } |
| 2451 | |
| 2452 | /* |
| 2453 | * In order to keep per-task stats reliable we need to flip the event |
| 2454 | * values when we flip the contexts. |
| 2455 | */ |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 2456 | value = local64_read(&next_event->count); |
| 2457 | value = local64_xchg(&event->count, value); |
| 2458 | local64_set(&next_event->count, value); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2459 | |
| 2460 | swap(event->total_time_enabled, next_event->total_time_enabled); |
| 2461 | swap(event->total_time_running, next_event->total_time_running); |
| 2462 | |
| 2463 | /* |
| 2464 | * Since we swizzled the values, update the user visible data too. |
| 2465 | */ |
| 2466 | perf_event_update_userpage(event); |
| 2467 | perf_event_update_userpage(next_event); |
| 2468 | } |
| 2469 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2470 | static void perf_event_sync_stat(struct perf_event_context *ctx, |
| 2471 | struct perf_event_context *next_ctx) |
| 2472 | { |
| 2473 | struct perf_event *event, *next_event; |
| 2474 | |
| 2475 | if (!ctx->nr_stat) |
| 2476 | return; |
| 2477 | |
Peter Zijlstra | 02ffdbc | 2009-11-20 22:19:50 +0100 | [diff] [blame] | 2478 | update_context_time(ctx); |
| 2479 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2480 | event = list_first_entry(&ctx->event_list, |
| 2481 | struct perf_event, event_entry); |
| 2482 | |
| 2483 | next_event = list_first_entry(&next_ctx->event_list, |
| 2484 | struct perf_event, event_entry); |
| 2485 | |
| 2486 | while (&event->event_entry != &ctx->event_list && |
| 2487 | &next_event->event_entry != &next_ctx->event_list) { |
| 2488 | |
| 2489 | __perf_event_sync_stat(event, next_event); |
| 2490 | |
| 2491 | event = list_next_entry(event, event_entry); |
| 2492 | next_event = list_next_entry(next_event, event_entry); |
| 2493 | } |
| 2494 | } |
| 2495 | |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 2496 | static void perf_event_context_sched_out(struct task_struct *task, int ctxn, |
| 2497 | struct task_struct *next) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2498 | { |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2499 | struct perf_event_context *ctx = task->perf_event_ctxp[ctxn]; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2500 | struct perf_event_context *next_ctx; |
Peter Zijlstra | 5a3126d | 2013-10-07 17:12:48 +0200 | [diff] [blame] | 2501 | struct perf_event_context *parent, *next_parent; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 2502 | struct perf_cpu_context *cpuctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2503 | int do_switch = 1; |
| 2504 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 2505 | if (likely(!ctx)) |
| 2506 | return; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2507 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 2508 | cpuctx = __get_cpu_context(ctx); |
| 2509 | if (!cpuctx->task_ctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2510 | return; |
| 2511 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2512 | rcu_read_lock(); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2513 | next_ctx = next->perf_event_ctxp[ctxn]; |
Peter Zijlstra | 5a3126d | 2013-10-07 17:12:48 +0200 | [diff] [blame] | 2514 | if (!next_ctx) |
| 2515 | goto unlock; |
| 2516 | |
| 2517 | parent = rcu_dereference(ctx->parent_ctx); |
| 2518 | next_parent = rcu_dereference(next_ctx->parent_ctx); |
| 2519 | |
| 2520 | /* If neither context have a parent context; they cannot be clones. */ |
Jiri Olsa | 802c8a6 | 2014-09-12 13:18:28 +0200 | [diff] [blame] | 2521 | if (!parent && !next_parent) |
Peter Zijlstra | 5a3126d | 2013-10-07 17:12:48 +0200 | [diff] [blame] | 2522 | goto unlock; |
| 2523 | |
| 2524 | if (next_parent == ctx || next_ctx == parent || next_parent == parent) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2525 | /* |
| 2526 | * Looks like the two contexts are clones, so we might be |
| 2527 | * able to optimize the context switch. We lock both |
| 2528 | * contexts and check that they are clones under the |
| 2529 | * lock (including re-checking that neither has been |
| 2530 | * uncloned in the meantime). It doesn't matter which |
| 2531 | * order we take the locks because no other cpu could |
| 2532 | * be trying to lock both of these tasks. |
| 2533 | */ |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 2534 | raw_spin_lock(&ctx->lock); |
| 2535 | raw_spin_lock_nested(&next_ctx->lock, SINGLE_DEPTH_NESTING); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2536 | if (context_equiv(ctx, next_ctx)) { |
| 2537 | /* |
| 2538 | * XXX do we need a memory barrier of sorts |
| 2539 | * wrt to rcu_dereference() of perf_event_ctxp |
| 2540 | */ |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2541 | task->perf_event_ctxp[ctxn] = next_ctx; |
| 2542 | next->perf_event_ctxp[ctxn] = ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2543 | ctx->task = next; |
| 2544 | next_ctx->task = task; |
Yan, Zheng | 5a158c3 | 2014-11-04 21:56:02 -0500 | [diff] [blame] | 2545 | |
| 2546 | swap(ctx->task_ctx_data, next_ctx->task_ctx_data); |
| 2547 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2548 | do_switch = 0; |
| 2549 | |
| 2550 | perf_event_sync_stat(ctx, next_ctx); |
| 2551 | } |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 2552 | raw_spin_unlock(&next_ctx->lock); |
| 2553 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2554 | } |
Peter Zijlstra | 5a3126d | 2013-10-07 17:12:48 +0200 | [diff] [blame] | 2555 | unlock: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2556 | rcu_read_unlock(); |
| 2557 | |
| 2558 | if (do_switch) { |
Peter Zijlstra | facc430 | 2011-04-09 21:17:42 +0200 | [diff] [blame] | 2559 | raw_spin_lock(&ctx->lock); |
Peter Zijlstra | 8833d0e | 2016-01-08 10:02:37 +0100 | [diff] [blame] | 2560 | task_ctx_sched_out(cpuctx, ctx); |
Peter Zijlstra | facc430 | 2011-04-09 21:17:42 +0200 | [diff] [blame] | 2561 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2562 | } |
| 2563 | } |
| 2564 | |
Yan, Zheng | ba53250 | 2014-11-04 21:55:58 -0500 | [diff] [blame] | 2565 | void perf_sched_cb_dec(struct pmu *pmu) |
| 2566 | { |
| 2567 | this_cpu_dec(perf_sched_cb_usages); |
| 2568 | } |
| 2569 | |
| 2570 | void perf_sched_cb_inc(struct pmu *pmu) |
| 2571 | { |
| 2572 | this_cpu_inc(perf_sched_cb_usages); |
| 2573 | } |
| 2574 | |
| 2575 | /* |
| 2576 | * This function provides the context switch callback to the lower code |
| 2577 | * layer. It is invoked ONLY when the context switch callback is enabled. |
| 2578 | */ |
| 2579 | static void perf_pmu_sched_task(struct task_struct *prev, |
| 2580 | struct task_struct *next, |
| 2581 | bool sched_in) |
| 2582 | { |
| 2583 | struct perf_cpu_context *cpuctx; |
| 2584 | struct pmu *pmu; |
| 2585 | unsigned long flags; |
| 2586 | |
| 2587 | if (prev == next) |
| 2588 | return; |
| 2589 | |
| 2590 | local_irq_save(flags); |
| 2591 | |
| 2592 | rcu_read_lock(); |
| 2593 | |
| 2594 | list_for_each_entry_rcu(pmu, &pmus, entry) { |
| 2595 | if (pmu->sched_task) { |
| 2596 | cpuctx = this_cpu_ptr(pmu->pmu_cpu_context); |
| 2597 | |
| 2598 | perf_ctx_lock(cpuctx, cpuctx->task_ctx); |
| 2599 | |
| 2600 | perf_pmu_disable(pmu); |
| 2601 | |
| 2602 | pmu->sched_task(cpuctx->task_ctx, sched_in); |
| 2603 | |
| 2604 | perf_pmu_enable(pmu); |
| 2605 | |
| 2606 | perf_ctx_unlock(cpuctx, cpuctx->task_ctx); |
| 2607 | } |
| 2608 | } |
| 2609 | |
| 2610 | rcu_read_unlock(); |
| 2611 | |
| 2612 | local_irq_restore(flags); |
| 2613 | } |
| 2614 | |
Adrian Hunter | 45ac140 | 2015-07-21 12:44:02 +0300 | [diff] [blame] | 2615 | static void perf_event_switch(struct task_struct *task, |
| 2616 | struct task_struct *next_prev, bool sched_in); |
| 2617 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2618 | #define for_each_task_context_nr(ctxn) \ |
| 2619 | for ((ctxn) = 0; (ctxn) < perf_nr_task_contexts; (ctxn)++) |
| 2620 | |
| 2621 | /* |
| 2622 | * Called from scheduler to remove the events of the current task, |
| 2623 | * with interrupts disabled. |
| 2624 | * |
| 2625 | * We stop each event and update the event value in event->count. |
| 2626 | * |
| 2627 | * This does not protect us against NMI, but disable() |
| 2628 | * sets the disabled bit in the control field of event _before_ |
| 2629 | * accessing the event control register. If a NMI hits, then it will |
| 2630 | * not restart the event. |
| 2631 | */ |
Jiri Olsa | ab0cce5 | 2012-05-23 13:13:02 +0200 | [diff] [blame] | 2632 | void __perf_event_task_sched_out(struct task_struct *task, |
| 2633 | struct task_struct *next) |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2634 | { |
| 2635 | int ctxn; |
| 2636 | |
Yan, Zheng | ba53250 | 2014-11-04 21:55:58 -0500 | [diff] [blame] | 2637 | if (__this_cpu_read(perf_sched_cb_usages)) |
| 2638 | perf_pmu_sched_task(task, next, false); |
| 2639 | |
Adrian Hunter | 45ac140 | 2015-07-21 12:44:02 +0300 | [diff] [blame] | 2640 | if (atomic_read(&nr_switch_events)) |
| 2641 | perf_event_switch(task, next, false); |
| 2642 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2643 | for_each_task_context_nr(ctxn) |
| 2644 | perf_event_context_sched_out(task, ctxn, next); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2645 | |
| 2646 | /* |
| 2647 | * if cgroup events exist on this CPU, then we need |
| 2648 | * to check if we have to switch out PMU state. |
| 2649 | * cgroup event are system-wide mode only |
| 2650 | */ |
Christoph Lameter | 4a32fea | 2014-08-17 12:30:27 -0500 | [diff] [blame] | 2651 | if (atomic_read(this_cpu_ptr(&perf_cgroup_events))) |
Stephane Eranian | a8d757e | 2011-08-25 15:58:03 +0200 | [diff] [blame] | 2652 | perf_cgroup_sched_out(task, next); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2653 | } |
| 2654 | |
Peter Zijlstra | 3e34950 | 2016-01-08 10:01:18 +0100 | [diff] [blame] | 2655 | static void task_ctx_sched_out(struct perf_cpu_context *cpuctx, |
| 2656 | struct perf_event_context *ctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2657 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2658 | if (!cpuctx->task_ctx) |
| 2659 | return; |
| 2660 | |
| 2661 | if (WARN_ON_ONCE(ctx != cpuctx->task_ctx)) |
| 2662 | return; |
| 2663 | |
Peter Zijlstra | 04dc2db | 2011-04-09 21:17:43 +0200 | [diff] [blame] | 2664 | ctx_sched_out(ctx, cpuctx, EVENT_ALL); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2665 | } |
| 2666 | |
| 2667 | /* |
| 2668 | * Called with IRQs disabled |
| 2669 | */ |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 2670 | static void cpu_ctx_sched_out(struct perf_cpu_context *cpuctx, |
| 2671 | enum event_type_t event_type) |
| 2672 | { |
| 2673 | ctx_sched_out(&cpuctx->ctx, cpuctx, event_type); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2674 | } |
| 2675 | |
| 2676 | static void |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 2677 | ctx_pinned_sched_in(struct perf_event_context *ctx, |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 2678 | struct perf_cpu_context *cpuctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2679 | { |
| 2680 | struct perf_event *event; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2681 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 2682 | list_for_each_entry(event, &ctx->pinned_groups, group_entry) { |
| 2683 | if (event->state <= PERF_EVENT_STATE_OFF) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2684 | continue; |
Stephane Eranian | 5632ab1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 2685 | if (!event_filter_match(event)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2686 | continue; |
| 2687 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2688 | /* may need to reset tstamp_enabled */ |
| 2689 | if (is_cgroup_event(event)) |
| 2690 | perf_cgroup_mark_enabled(event, ctx); |
| 2691 | |
Xiao Guangrong | 8c9ed8e | 2009-09-25 13:51:17 +0800 | [diff] [blame] | 2692 | if (group_can_go_on(event, cpuctx, 1)) |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 2693 | group_sched_in(event, cpuctx, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2694 | |
| 2695 | /* |
| 2696 | * If this pinned group hasn't been scheduled, |
| 2697 | * put it in error state. |
| 2698 | */ |
| 2699 | if (event->state == PERF_EVENT_STATE_INACTIVE) { |
| 2700 | update_group_times(event); |
| 2701 | event->state = PERF_EVENT_STATE_ERROR; |
| 2702 | } |
| 2703 | } |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 2704 | } |
| 2705 | |
| 2706 | static void |
| 2707 | ctx_flexible_sched_in(struct perf_event_context *ctx, |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 2708 | struct perf_cpu_context *cpuctx) |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 2709 | { |
| 2710 | struct perf_event *event; |
| 2711 | int can_add_hw = 1; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2712 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 2713 | list_for_each_entry(event, &ctx->flexible_groups, group_entry) { |
| 2714 | /* Ignore events in OFF or ERROR state */ |
| 2715 | if (event->state <= PERF_EVENT_STATE_OFF) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2716 | continue; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2717 | /* |
| 2718 | * Listen to the 'cpu' scheduling filter constraint |
| 2719 | * of events: |
| 2720 | */ |
Stephane Eranian | 5632ab1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 2721 | if (!event_filter_match(event)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2722 | continue; |
| 2723 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2724 | /* may need to reset tstamp_enabled */ |
| 2725 | if (is_cgroup_event(event)) |
| 2726 | perf_cgroup_mark_enabled(event, ctx); |
| 2727 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 2728 | if (group_can_go_on(event, cpuctx, can_add_hw)) { |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 2729 | if (group_sched_in(event, cpuctx, ctx)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2730 | can_add_hw = 0; |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 2731 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2732 | } |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 2733 | } |
| 2734 | |
| 2735 | static void |
| 2736 | ctx_sched_in(struct perf_event_context *ctx, |
| 2737 | struct perf_cpu_context *cpuctx, |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2738 | enum event_type_t event_type, |
| 2739 | struct task_struct *task) |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 2740 | { |
Peter Zijlstra | db24d33 | 2011-04-09 21:17:45 +0200 | [diff] [blame] | 2741 | int is_active = ctx->is_active; |
Peter Zijlstra | c994d61 | 2016-01-08 09:20:23 +0100 | [diff] [blame] | 2742 | u64 now; |
| 2743 | |
| 2744 | lockdep_assert_held(&ctx->lock); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2745 | |
Peter Zijlstra | 39a4364 | 2016-01-11 12:46:35 +0100 | [diff] [blame^] | 2746 | if (likely(!ctx->nr_events)) |
| 2747 | return; |
| 2748 | |
Peter Zijlstra | db24d33 | 2011-04-09 21:17:45 +0200 | [diff] [blame] | 2749 | ctx->is_active |= event_type; |
Peter Zijlstra | 63e30d3 | 2016-01-08 11:39:10 +0100 | [diff] [blame] | 2750 | if (ctx->task) { |
| 2751 | if (!is_active) |
| 2752 | cpuctx->task_ctx = ctx; |
| 2753 | else |
| 2754 | WARN_ON_ONCE(cpuctx->task_ctx != ctx); |
| 2755 | } |
| 2756 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2757 | now = perf_clock(); |
| 2758 | ctx->timestamp = now; |
Stephane Eranian | 3f7cce3 | 2011-02-18 14:40:01 +0200 | [diff] [blame] | 2759 | perf_cgroup_set_timestamp(task, ctx); |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 2760 | /* |
| 2761 | * First go through the list and put on any pinned groups |
| 2762 | * in order to give them the best chance of going on. |
| 2763 | */ |
Peter Zijlstra | db24d33 | 2011-04-09 21:17:45 +0200 | [diff] [blame] | 2764 | if (!(is_active & EVENT_PINNED) && (event_type & EVENT_PINNED)) |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 2765 | ctx_pinned_sched_in(ctx, cpuctx); |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 2766 | |
| 2767 | /* Then walk through the lower prio flexible groups */ |
Peter Zijlstra | db24d33 | 2011-04-09 21:17:45 +0200 | [diff] [blame] | 2768 | if (!(is_active & EVENT_FLEXIBLE) && (event_type & EVENT_FLEXIBLE)) |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 2769 | ctx_flexible_sched_in(ctx, cpuctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2770 | } |
| 2771 | |
Frederic Weisbecker | 329c0e0 | 2010-01-17 12:56:05 +0100 | [diff] [blame] | 2772 | static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx, |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2773 | enum event_type_t event_type, |
| 2774 | struct task_struct *task) |
Frederic Weisbecker | 329c0e0 | 2010-01-17 12:56:05 +0100 | [diff] [blame] | 2775 | { |
| 2776 | struct perf_event_context *ctx = &cpuctx->ctx; |
| 2777 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2778 | ctx_sched_in(ctx, cpuctx, event_type, task); |
Frederic Weisbecker | 329c0e0 | 2010-01-17 12:56:05 +0100 | [diff] [blame] | 2779 | } |
| 2780 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2781 | static void perf_event_context_sched_in(struct perf_event_context *ctx, |
| 2782 | struct task_struct *task) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2783 | { |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2784 | struct perf_cpu_context *cpuctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2785 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 2786 | cpuctx = __get_cpu_context(ctx); |
Frederic Weisbecker | 329c0e0 | 2010-01-17 12:56:05 +0100 | [diff] [blame] | 2787 | if (cpuctx->task_ctx == ctx) |
| 2788 | return; |
| 2789 | |
Peter Zijlstra | facc430 | 2011-04-09 21:17:42 +0200 | [diff] [blame] | 2790 | perf_ctx_lock(cpuctx, ctx); |
Peter Zijlstra | 1b9a644 | 2010-09-07 18:32:22 +0200 | [diff] [blame] | 2791 | perf_pmu_disable(ctx->pmu); |
Frederic Weisbecker | 329c0e0 | 2010-01-17 12:56:05 +0100 | [diff] [blame] | 2792 | /* |
| 2793 | * We want to keep the following priority order: |
| 2794 | * cpu pinned (that don't need to move), task pinned, |
| 2795 | * cpu flexible, task flexible. |
| 2796 | */ |
| 2797 | cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE); |
Peter Zijlstra | 63e30d3 | 2016-01-08 11:39:10 +0100 | [diff] [blame] | 2798 | perf_event_sched_in(cpuctx, ctx, task); |
Peter Zijlstra | facc430 | 2011-04-09 21:17:42 +0200 | [diff] [blame] | 2799 | perf_pmu_enable(ctx->pmu); |
| 2800 | perf_ctx_unlock(cpuctx, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2801 | } |
| 2802 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2803 | /* |
| 2804 | * Called from scheduler to add the events of the current task |
| 2805 | * with interrupts disabled. |
| 2806 | * |
| 2807 | * We restore the event value and then enable it. |
| 2808 | * |
| 2809 | * This does not protect us against NMI, but enable() |
| 2810 | * sets the enabled bit in the control field of event _before_ |
| 2811 | * accessing the event control register. If a NMI hits, then it will |
| 2812 | * keep the event running. |
| 2813 | */ |
Jiri Olsa | ab0cce5 | 2012-05-23 13:13:02 +0200 | [diff] [blame] | 2814 | void __perf_event_task_sched_in(struct task_struct *prev, |
| 2815 | struct task_struct *task) |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2816 | { |
| 2817 | struct perf_event_context *ctx; |
| 2818 | int ctxn; |
| 2819 | |
Peter Zijlstra | 7e41d17 | 2016-01-08 09:21:40 +0100 | [diff] [blame] | 2820 | /* |
| 2821 | * If cgroup events exist on this CPU, then we need to check if we have |
| 2822 | * to switch in PMU state; cgroup event are system-wide mode only. |
| 2823 | * |
| 2824 | * Since cgroup events are CPU events, we must schedule these in before |
| 2825 | * we schedule in the task events. |
| 2826 | */ |
| 2827 | if (atomic_read(this_cpu_ptr(&perf_cgroup_events))) |
| 2828 | perf_cgroup_sched_in(prev, task); |
| 2829 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2830 | for_each_task_context_nr(ctxn) { |
| 2831 | ctx = task->perf_event_ctxp[ctxn]; |
| 2832 | if (likely(!ctx)) |
| 2833 | continue; |
| 2834 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 2835 | perf_event_context_sched_in(ctx, task); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2836 | } |
Stephane Eranian | d010b33 | 2012-02-09 23:21:00 +0100 | [diff] [blame] | 2837 | |
Adrian Hunter | 45ac140 | 2015-07-21 12:44:02 +0300 | [diff] [blame] | 2838 | if (atomic_read(&nr_switch_events)) |
| 2839 | perf_event_switch(task, prev, true); |
| 2840 | |
Yan, Zheng | ba53250 | 2014-11-04 21:55:58 -0500 | [diff] [blame] | 2841 | if (__this_cpu_read(perf_sched_cb_usages)) |
| 2842 | perf_pmu_sched_task(prev, task, true); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2843 | } |
| 2844 | |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 2845 | static u64 perf_calculate_period(struct perf_event *event, u64 nsec, u64 count) |
| 2846 | { |
| 2847 | u64 frequency = event->attr.sample_freq; |
| 2848 | u64 sec = NSEC_PER_SEC; |
| 2849 | u64 divisor, dividend; |
| 2850 | |
| 2851 | int count_fls, nsec_fls, frequency_fls, sec_fls; |
| 2852 | |
| 2853 | count_fls = fls64(count); |
| 2854 | nsec_fls = fls64(nsec); |
| 2855 | frequency_fls = fls64(frequency); |
| 2856 | sec_fls = 30; |
| 2857 | |
| 2858 | /* |
| 2859 | * We got @count in @nsec, with a target of sample_freq HZ |
| 2860 | * the target period becomes: |
| 2861 | * |
| 2862 | * @count * 10^9 |
| 2863 | * period = ------------------- |
| 2864 | * @nsec * sample_freq |
| 2865 | * |
| 2866 | */ |
| 2867 | |
| 2868 | /* |
| 2869 | * Reduce accuracy by one bit such that @a and @b converge |
| 2870 | * to a similar magnitude. |
| 2871 | */ |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 2872 | #define REDUCE_FLS(a, b) \ |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 2873 | do { \ |
| 2874 | if (a##_fls > b##_fls) { \ |
| 2875 | a >>= 1; \ |
| 2876 | a##_fls--; \ |
| 2877 | } else { \ |
| 2878 | b >>= 1; \ |
| 2879 | b##_fls--; \ |
| 2880 | } \ |
| 2881 | } while (0) |
| 2882 | |
| 2883 | /* |
| 2884 | * Reduce accuracy until either term fits in a u64, then proceed with |
| 2885 | * the other, so that finally we can do a u64/u64 division. |
| 2886 | */ |
| 2887 | while (count_fls + sec_fls > 64 && nsec_fls + frequency_fls > 64) { |
| 2888 | REDUCE_FLS(nsec, frequency); |
| 2889 | REDUCE_FLS(sec, count); |
| 2890 | } |
| 2891 | |
| 2892 | if (count_fls + sec_fls > 64) { |
| 2893 | divisor = nsec * frequency; |
| 2894 | |
| 2895 | while (count_fls + sec_fls > 64) { |
| 2896 | REDUCE_FLS(count, sec); |
| 2897 | divisor >>= 1; |
| 2898 | } |
| 2899 | |
| 2900 | dividend = count * sec; |
| 2901 | } else { |
| 2902 | dividend = count * sec; |
| 2903 | |
| 2904 | while (nsec_fls + frequency_fls > 64) { |
| 2905 | REDUCE_FLS(nsec, frequency); |
| 2906 | dividend >>= 1; |
| 2907 | } |
| 2908 | |
| 2909 | divisor = nsec * frequency; |
| 2910 | } |
| 2911 | |
Peter Zijlstra | f6ab91a | 2010-06-04 15:18:01 +0200 | [diff] [blame] | 2912 | if (!divisor) |
| 2913 | return dividend; |
| 2914 | |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 2915 | return div64_u64(dividend, divisor); |
| 2916 | } |
| 2917 | |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 2918 | static DEFINE_PER_CPU(int, perf_throttled_count); |
| 2919 | static DEFINE_PER_CPU(u64, perf_throttled_seq); |
| 2920 | |
Stephane Eranian | f39d47f | 2012-02-07 14:39:57 +0100 | [diff] [blame] | 2921 | static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count, bool disable) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2922 | { |
| 2923 | struct hw_perf_event *hwc = &event->hw; |
Peter Zijlstra | f6ab91a | 2010-06-04 15:18:01 +0200 | [diff] [blame] | 2924 | s64 period, sample_period; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2925 | s64 delta; |
| 2926 | |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 2927 | period = perf_calculate_period(event, nsec, count); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2928 | |
| 2929 | delta = (s64)(period - hwc->sample_period); |
| 2930 | delta = (delta + 7) / 8; /* low pass filter */ |
| 2931 | |
| 2932 | sample_period = hwc->sample_period + delta; |
| 2933 | |
| 2934 | if (!sample_period) |
| 2935 | sample_period = 1; |
| 2936 | |
| 2937 | hwc->sample_period = sample_period; |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 2938 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 2939 | if (local64_read(&hwc->period_left) > 8*sample_period) { |
Stephane Eranian | f39d47f | 2012-02-07 14:39:57 +0100 | [diff] [blame] | 2940 | if (disable) |
| 2941 | event->pmu->stop(event, PERF_EF_UPDATE); |
| 2942 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 2943 | local64_set(&hwc->period_left, 0); |
Stephane Eranian | f39d47f | 2012-02-07 14:39:57 +0100 | [diff] [blame] | 2944 | |
| 2945 | if (disable) |
| 2946 | event->pmu->start(event, PERF_EF_RELOAD); |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 2947 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2948 | } |
| 2949 | |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 2950 | /* |
| 2951 | * combine freq adjustment with unthrottling to avoid two passes over the |
| 2952 | * events. At the same time, make sure, having freq events does not change |
| 2953 | * the rate of unthrottling as that would introduce bias. |
| 2954 | */ |
| 2955 | static void perf_adjust_freq_unthr_context(struct perf_event_context *ctx, |
| 2956 | int needs_unthr) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2957 | { |
| 2958 | struct perf_event *event; |
| 2959 | struct hw_perf_event *hwc; |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 2960 | u64 now, period = TICK_NSEC; |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 2961 | s64 delta; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2962 | |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 2963 | /* |
| 2964 | * only need to iterate over all events iff: |
| 2965 | * - context have events in frequency mode (needs freq adjust) |
| 2966 | * - there are events to unthrottle on this cpu |
| 2967 | */ |
| 2968 | if (!(ctx->nr_freq || needs_unthr)) |
Peter Zijlstra | 0f5a260 | 2011-11-16 14:38:16 +0100 | [diff] [blame] | 2969 | return; |
| 2970 | |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 2971 | raw_spin_lock(&ctx->lock); |
Stephane Eranian | f39d47f | 2012-02-07 14:39:57 +0100 | [diff] [blame] | 2972 | perf_pmu_disable(ctx->pmu); |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 2973 | |
Paul Mackerras | 03541f8 | 2009-10-14 16:58:03 +1100 | [diff] [blame] | 2974 | list_for_each_entry_rcu(event, &ctx->event_list, event_entry) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2975 | if (event->state != PERF_EVENT_STATE_ACTIVE) |
| 2976 | continue; |
| 2977 | |
Stephane Eranian | 5632ab1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 2978 | if (!event_filter_match(event)) |
Peter Zijlstra | 5d27c23 | 2009-12-17 13:16:32 +0100 | [diff] [blame] | 2979 | continue; |
| 2980 | |
Alexander Shishkin | 4437727 | 2013-12-16 14:17:36 +0200 | [diff] [blame] | 2981 | perf_pmu_disable(event->pmu); |
| 2982 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2983 | hwc = &event->hw; |
| 2984 | |
Jiri Olsa | ae23bff | 2013-08-24 16:45:54 +0200 | [diff] [blame] | 2985 | if (hwc->interrupts == MAX_INTERRUPTS) { |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 2986 | hwc->interrupts = 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2987 | perf_log_throttle(event, 1); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 2988 | event->pmu->start(event, 0); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2989 | } |
| 2990 | |
| 2991 | if (!event->attr.freq || !event->attr.sample_freq) |
Alexander Shishkin | 4437727 | 2013-12-16 14:17:36 +0200 | [diff] [blame] | 2992 | goto next; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2993 | |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 2994 | /* |
| 2995 | * stop the event and update event->count |
| 2996 | */ |
| 2997 | event->pmu->stop(event, PERF_EF_UPDATE); |
| 2998 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 2999 | now = local64_read(&event->count); |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 3000 | delta = now - hwc->freq_count_stamp; |
| 3001 | hwc->freq_count_stamp = now; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3002 | |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 3003 | /* |
| 3004 | * restart the event |
| 3005 | * reload only if value has changed |
Stephane Eranian | f39d47f | 2012-02-07 14:39:57 +0100 | [diff] [blame] | 3006 | * we have stopped the event so tell that |
| 3007 | * to perf_adjust_period() to avoid stopping it |
| 3008 | * twice. |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 3009 | */ |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 3010 | if (delta > 0) |
Stephane Eranian | f39d47f | 2012-02-07 14:39:57 +0100 | [diff] [blame] | 3011 | perf_adjust_period(event, period, delta, false); |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 3012 | |
| 3013 | event->pmu->start(event, delta > 0 ? PERF_EF_RELOAD : 0); |
Alexander Shishkin | 4437727 | 2013-12-16 14:17:36 +0200 | [diff] [blame] | 3014 | next: |
| 3015 | perf_pmu_enable(event->pmu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3016 | } |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 3017 | |
Stephane Eranian | f39d47f | 2012-02-07 14:39:57 +0100 | [diff] [blame] | 3018 | perf_pmu_enable(ctx->pmu); |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 3019 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3020 | } |
| 3021 | |
| 3022 | /* |
| 3023 | * Round-robin a context's events: |
| 3024 | */ |
| 3025 | static void rotate_ctx(struct perf_event_context *ctx) |
| 3026 | { |
Thomas Gleixner | dddd337 | 2010-11-24 10:05:55 +0100 | [diff] [blame] | 3027 | /* |
| 3028 | * Rotate the first entry last of non-pinned groups. Rotation might be |
| 3029 | * disabled by the inheritance code. |
| 3030 | */ |
| 3031 | if (!ctx->rotate_disable) |
| 3032 | list_rotate_left(&ctx->flexible_groups); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3033 | } |
| 3034 | |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 3035 | static int perf_rotate_context(struct perf_cpu_context *cpuctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3036 | { |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 3037 | struct perf_event_context *ctx = NULL; |
Mark Rutland | 2fde4f9 | 2015-01-07 15:01:54 +0000 | [diff] [blame] | 3038 | int rotate = 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3039 | |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 3040 | if (cpuctx->ctx.nr_events) { |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 3041 | if (cpuctx->ctx.nr_events != cpuctx->ctx.nr_active) |
| 3042 | rotate = 1; |
| 3043 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3044 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 3045 | ctx = cpuctx->task_ctx; |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 3046 | if (ctx && ctx->nr_events) { |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 3047 | if (ctx->nr_events != ctx->nr_active) |
| 3048 | rotate = 1; |
| 3049 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3050 | |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 3051 | if (!rotate) |
Peter Zijlstra | 0f5a260 | 2011-11-16 14:38:16 +0100 | [diff] [blame] | 3052 | goto done; |
| 3053 | |
Peter Zijlstra | facc430 | 2011-04-09 21:17:42 +0200 | [diff] [blame] | 3054 | perf_ctx_lock(cpuctx, cpuctx->task_ctx); |
Peter Zijlstra | 1b9a644 | 2010-09-07 18:32:22 +0200 | [diff] [blame] | 3055 | perf_pmu_disable(cpuctx->ctx.pmu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3056 | |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 3057 | cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE); |
| 3058 | if (ctx) |
| 3059 | ctx_sched_out(ctx, cpuctx, EVENT_FLEXIBLE); |
Peter Zijlstra | d4944a0 | 2010-03-08 13:51:20 +0100 | [diff] [blame] | 3060 | |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 3061 | rotate_ctx(&cpuctx->ctx); |
| 3062 | if (ctx) |
| 3063 | rotate_ctx(ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3064 | |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 3065 | perf_event_sched_in(cpuctx, ctx, current); |
Peter Zijlstra | 0f5a260 | 2011-11-16 14:38:16 +0100 | [diff] [blame] | 3066 | |
| 3067 | perf_pmu_enable(cpuctx->ctx.pmu); |
| 3068 | perf_ctx_unlock(cpuctx, cpuctx->task_ctx); |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 3069 | done: |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 3070 | |
| 3071 | return rotate; |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 3072 | } |
| 3073 | |
Frederic Weisbecker | 026249e | 2013-04-20 15:58:34 +0200 | [diff] [blame] | 3074 | #ifdef CONFIG_NO_HZ_FULL |
| 3075 | bool perf_event_can_stop_tick(void) |
| 3076 | { |
Frederic Weisbecker | 948b26b | 2013-08-02 18:29:55 +0200 | [diff] [blame] | 3077 | if (atomic_read(&nr_freq_events) || |
Frederic Weisbecker | d84153d | 2013-07-23 02:31:05 +0200 | [diff] [blame] | 3078 | __this_cpu_read(perf_throttled_count)) |
Frederic Weisbecker | 026249e | 2013-04-20 15:58:34 +0200 | [diff] [blame] | 3079 | return false; |
Frederic Weisbecker | d84153d | 2013-07-23 02:31:05 +0200 | [diff] [blame] | 3080 | else |
| 3081 | return true; |
Frederic Weisbecker | 026249e | 2013-04-20 15:58:34 +0200 | [diff] [blame] | 3082 | } |
| 3083 | #endif |
| 3084 | |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 3085 | void perf_event_task_tick(void) |
| 3086 | { |
Mark Rutland | 2fde4f9 | 2015-01-07 15:01:54 +0000 | [diff] [blame] | 3087 | struct list_head *head = this_cpu_ptr(&active_ctx_list); |
| 3088 | struct perf_event_context *ctx, *tmp; |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 3089 | int throttled; |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 3090 | |
| 3091 | WARN_ON(!irqs_disabled()); |
| 3092 | |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 3093 | __this_cpu_inc(perf_throttled_seq); |
| 3094 | throttled = __this_cpu_xchg(perf_throttled_count, 0); |
| 3095 | |
Mark Rutland | 2fde4f9 | 2015-01-07 15:01:54 +0000 | [diff] [blame] | 3096 | list_for_each_entry_safe(ctx, tmp, head, active_ctx_list) |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 3097 | perf_adjust_freq_unthr_context(ctx, throttled); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3098 | } |
| 3099 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 3100 | static int event_enable_on_exec(struct perf_event *event, |
| 3101 | struct perf_event_context *ctx) |
| 3102 | { |
| 3103 | if (!event->attr.enable_on_exec) |
| 3104 | return 0; |
| 3105 | |
| 3106 | event->attr.enable_on_exec = 0; |
| 3107 | if (event->state >= PERF_EVENT_STATE_INACTIVE) |
| 3108 | return 0; |
| 3109 | |
Peter Zijlstra | 1d9b482 | 2011-11-23 12:34:20 +0100 | [diff] [blame] | 3110 | __perf_event_mark_enabled(event); |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 3111 | |
| 3112 | return 1; |
| 3113 | } |
| 3114 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3115 | /* |
| 3116 | * Enable all of a task's events that have been marked enable-on-exec. |
| 3117 | * This expects task == current. |
| 3118 | */ |
Peter Zijlstra | c127449 | 2015-12-10 20:57:40 +0100 | [diff] [blame] | 3119 | static void perf_event_enable_on_exec(int ctxn) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3120 | { |
Peter Zijlstra | c127449 | 2015-12-10 20:57:40 +0100 | [diff] [blame] | 3121 | struct perf_event_context *ctx, *clone_ctx = NULL; |
Peter Zijlstra | 3e34950 | 2016-01-08 10:01:18 +0100 | [diff] [blame] | 3122 | struct perf_cpu_context *cpuctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3123 | struct perf_event *event; |
| 3124 | unsigned long flags; |
| 3125 | int enabled = 0; |
| 3126 | |
| 3127 | local_irq_save(flags); |
Peter Zijlstra | c127449 | 2015-12-10 20:57:40 +0100 | [diff] [blame] | 3128 | ctx = current->perf_event_ctxp[ctxn]; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3129 | if (!ctx || !ctx->nr_events) |
| 3130 | goto out; |
| 3131 | |
Peter Zijlstra | 3e34950 | 2016-01-08 10:01:18 +0100 | [diff] [blame] | 3132 | cpuctx = __get_cpu_context(ctx); |
| 3133 | perf_ctx_lock(cpuctx, ctx); |
| 3134 | list_for_each_entry(event, &ctx->event_list, event_entry) |
| 3135 | enabled |= event_enable_on_exec(event, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3136 | |
| 3137 | /* |
Peter Zijlstra | 3e34950 | 2016-01-08 10:01:18 +0100 | [diff] [blame] | 3138 | * Unclone and reschedule this context if we enabled any event. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3139 | */ |
Peter Zijlstra | 3e34950 | 2016-01-08 10:01:18 +0100 | [diff] [blame] | 3140 | if (enabled) { |
Peter Zijlstra | 211de6e | 2014-09-30 19:23:08 +0200 | [diff] [blame] | 3141 | clone_ctx = unclone_ctx(ctx); |
Peter Zijlstra | 3e34950 | 2016-01-08 10:01:18 +0100 | [diff] [blame] | 3142 | ctx_resched(cpuctx, ctx); |
| 3143 | } |
| 3144 | perf_ctx_unlock(cpuctx, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3145 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 3146 | out: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3147 | local_irq_restore(flags); |
Peter Zijlstra | 211de6e | 2014-09-30 19:23:08 +0200 | [diff] [blame] | 3148 | |
| 3149 | if (clone_ctx) |
| 3150 | put_ctx(clone_ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3151 | } |
| 3152 | |
Peter Zijlstra | e041e32 | 2014-05-21 17:32:19 +0200 | [diff] [blame] | 3153 | void perf_event_exec(void) |
| 3154 | { |
Peter Zijlstra | e041e32 | 2014-05-21 17:32:19 +0200 | [diff] [blame] | 3155 | int ctxn; |
| 3156 | |
| 3157 | rcu_read_lock(); |
Peter Zijlstra | c127449 | 2015-12-10 20:57:40 +0100 | [diff] [blame] | 3158 | for_each_task_context_nr(ctxn) |
| 3159 | perf_event_enable_on_exec(ctxn); |
Peter Zijlstra | e041e32 | 2014-05-21 17:32:19 +0200 | [diff] [blame] | 3160 | rcu_read_unlock(); |
| 3161 | } |
| 3162 | |
Peter Zijlstra | 0492d4c | 2015-09-03 20:07:48 -0700 | [diff] [blame] | 3163 | struct perf_read_data { |
| 3164 | struct perf_event *event; |
| 3165 | bool group; |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3166 | int ret; |
Peter Zijlstra | 0492d4c | 2015-09-03 20:07:48 -0700 | [diff] [blame] | 3167 | }; |
| 3168 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3169 | /* |
| 3170 | * Cross CPU call to read the hardware event |
| 3171 | */ |
| 3172 | static void __perf_event_read(void *info) |
| 3173 | { |
Peter Zijlstra | 0492d4c | 2015-09-03 20:07:48 -0700 | [diff] [blame] | 3174 | struct perf_read_data *data = info; |
| 3175 | struct perf_event *sub, *event = data->event; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3176 | struct perf_event_context *ctx = event->ctx; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 3177 | struct perf_cpu_context *cpuctx = __get_cpu_context(ctx); |
Sukadev Bhattiprolu | 4a00c16 | 2015-09-03 20:07:51 -0700 | [diff] [blame] | 3178 | struct pmu *pmu = event->pmu; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3179 | |
| 3180 | /* |
| 3181 | * If this is a task context, we need to check whether it is |
| 3182 | * the current task context of this cpu. If not it has been |
| 3183 | * scheduled out before the smp call arrived. In that case |
| 3184 | * event->count would have been updated to a recent sample |
| 3185 | * when the event was scheduled out. |
| 3186 | */ |
| 3187 | if (ctx->task && cpuctx->task_ctx != ctx) |
| 3188 | return; |
| 3189 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 3190 | raw_spin_lock(&ctx->lock); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 3191 | if (ctx->is_active) { |
Peter Zijlstra | 542e72f | 2011-01-26 15:38:35 +0100 | [diff] [blame] | 3192 | update_context_time(ctx); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 3193 | update_cgrp_time_from_event(event); |
| 3194 | } |
Peter Zijlstra | 0492d4c | 2015-09-03 20:07:48 -0700 | [diff] [blame] | 3195 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3196 | update_event_times(event); |
Sukadev Bhattiprolu | 4a00c16 | 2015-09-03 20:07:51 -0700 | [diff] [blame] | 3197 | if (event->state != PERF_EVENT_STATE_ACTIVE) |
Peter Zijlstra | 0492d4c | 2015-09-03 20:07:48 -0700 | [diff] [blame] | 3198 | goto unlock; |
| 3199 | |
Sukadev Bhattiprolu | 4a00c16 | 2015-09-03 20:07:51 -0700 | [diff] [blame] | 3200 | if (!data->group) { |
| 3201 | pmu->read(event); |
| 3202 | data->ret = 0; |
| 3203 | goto unlock; |
| 3204 | } |
| 3205 | |
| 3206 | pmu->start_txn(pmu, PERF_PMU_TXN_READ); |
| 3207 | |
| 3208 | pmu->read(event); |
| 3209 | |
Peter Zijlstra | 0492d4c | 2015-09-03 20:07:48 -0700 | [diff] [blame] | 3210 | list_for_each_entry(sub, &event->sibling_list, group_entry) { |
| 3211 | update_event_times(sub); |
Sukadev Bhattiprolu | 4a00c16 | 2015-09-03 20:07:51 -0700 | [diff] [blame] | 3212 | if (sub->state == PERF_EVENT_STATE_ACTIVE) { |
| 3213 | /* |
| 3214 | * Use sibling's PMU rather than @event's since |
| 3215 | * sibling could be on different (eg: software) PMU. |
| 3216 | */ |
Peter Zijlstra | 0492d4c | 2015-09-03 20:07:48 -0700 | [diff] [blame] | 3217 | sub->pmu->read(sub); |
Sukadev Bhattiprolu | 4a00c16 | 2015-09-03 20:07:51 -0700 | [diff] [blame] | 3218 | } |
Peter Zijlstra | 0492d4c | 2015-09-03 20:07:48 -0700 | [diff] [blame] | 3219 | } |
Sukadev Bhattiprolu | 4a00c16 | 2015-09-03 20:07:51 -0700 | [diff] [blame] | 3220 | |
| 3221 | data->ret = pmu->commit_txn(pmu); |
Peter Zijlstra | 0492d4c | 2015-09-03 20:07:48 -0700 | [diff] [blame] | 3222 | |
| 3223 | unlock: |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 3224 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3225 | } |
| 3226 | |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 3227 | static inline u64 perf_event_count(struct perf_event *event) |
| 3228 | { |
Matt Fleming | eacd3ec | 2015-01-23 18:45:41 +0000 | [diff] [blame] | 3229 | if (event->pmu->count) |
| 3230 | return event->pmu->count(event); |
| 3231 | |
| 3232 | return __perf_event_count(event); |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 3233 | } |
| 3234 | |
Kaixu Xia | ffe8690 | 2015-08-06 07:02:32 +0000 | [diff] [blame] | 3235 | /* |
| 3236 | * NMI-safe method to read a local event, that is an event that |
| 3237 | * is: |
| 3238 | * - either for the current task, or for this CPU |
| 3239 | * - does not have inherit set, for inherited task events |
| 3240 | * will not be local and we cannot read them atomically |
| 3241 | * - must not have a pmu::count method |
| 3242 | */ |
| 3243 | u64 perf_event_read_local(struct perf_event *event) |
| 3244 | { |
| 3245 | unsigned long flags; |
| 3246 | u64 val; |
| 3247 | |
| 3248 | /* |
| 3249 | * Disabling interrupts avoids all counter scheduling (context |
| 3250 | * switches, timer based rotation and IPIs). |
| 3251 | */ |
| 3252 | local_irq_save(flags); |
| 3253 | |
| 3254 | /* If this is a per-task event, it must be for current */ |
| 3255 | WARN_ON_ONCE((event->attach_state & PERF_ATTACH_TASK) && |
| 3256 | event->hw.target != current); |
| 3257 | |
| 3258 | /* If this is a per-CPU event, it must be for this CPU */ |
| 3259 | WARN_ON_ONCE(!(event->attach_state & PERF_ATTACH_TASK) && |
| 3260 | event->cpu != smp_processor_id()); |
| 3261 | |
| 3262 | /* |
| 3263 | * It must not be an event with inherit set, we cannot read |
| 3264 | * all child counters from atomic context. |
| 3265 | */ |
| 3266 | WARN_ON_ONCE(event->attr.inherit); |
| 3267 | |
| 3268 | /* |
| 3269 | * It must not have a pmu::count method, those are not |
| 3270 | * NMI safe. |
| 3271 | */ |
| 3272 | WARN_ON_ONCE(event->pmu->count); |
| 3273 | |
| 3274 | /* |
| 3275 | * If the event is currently on this CPU, its either a per-task event, |
| 3276 | * or local to this CPU. Furthermore it means its ACTIVE (otherwise |
| 3277 | * oncpu == -1). |
| 3278 | */ |
| 3279 | if (event->oncpu == smp_processor_id()) |
| 3280 | event->pmu->read(event); |
| 3281 | |
| 3282 | val = local64_read(&event->count); |
| 3283 | local_irq_restore(flags); |
| 3284 | |
| 3285 | return val; |
| 3286 | } |
| 3287 | |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3288 | static int perf_event_read(struct perf_event *event, bool group) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3289 | { |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3290 | int ret = 0; |
| 3291 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3292 | /* |
| 3293 | * If event is enabled and currently active on a CPU, update the |
| 3294 | * value in the event structure: |
| 3295 | */ |
| 3296 | if (event->state == PERF_EVENT_STATE_ACTIVE) { |
Peter Zijlstra | 0492d4c | 2015-09-03 20:07:48 -0700 | [diff] [blame] | 3297 | struct perf_read_data data = { |
| 3298 | .event = event, |
| 3299 | .group = group, |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3300 | .ret = 0, |
Peter Zijlstra | 0492d4c | 2015-09-03 20:07:48 -0700 | [diff] [blame] | 3301 | }; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3302 | smp_call_function_single(event->oncpu, |
Peter Zijlstra | 0492d4c | 2015-09-03 20:07:48 -0700 | [diff] [blame] | 3303 | __perf_event_read, &data, 1); |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3304 | ret = data.ret; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3305 | } else if (event->state == PERF_EVENT_STATE_INACTIVE) { |
Peter Zijlstra | 2b8988c | 2009-11-20 22:19:54 +0100 | [diff] [blame] | 3306 | struct perf_event_context *ctx = event->ctx; |
| 3307 | unsigned long flags; |
| 3308 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 3309 | raw_spin_lock_irqsave(&ctx->lock, flags); |
Stephane Eranian | c530ccd | 2010-10-15 15:26:01 +0200 | [diff] [blame] | 3310 | /* |
| 3311 | * may read while context is not active |
| 3312 | * (e.g., thread is blocked), in that case |
| 3313 | * we cannot update context time |
| 3314 | */ |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 3315 | if (ctx->is_active) { |
Stephane Eranian | c530ccd | 2010-10-15 15:26:01 +0200 | [diff] [blame] | 3316 | update_context_time(ctx); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 3317 | update_cgrp_time_from_event(event); |
| 3318 | } |
Peter Zijlstra | 0492d4c | 2015-09-03 20:07:48 -0700 | [diff] [blame] | 3319 | if (group) |
| 3320 | update_group_times(event); |
| 3321 | else |
| 3322 | update_event_times(event); |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 3323 | raw_spin_unlock_irqrestore(&ctx->lock, flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3324 | } |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3325 | |
| 3326 | return ret; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3327 | } |
| 3328 | |
| 3329 | /* |
| 3330 | * Initialize the perf_event context in a task_struct: |
| 3331 | */ |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 3332 | static void __perf_event_init_context(struct perf_event_context *ctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3333 | { |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 3334 | raw_spin_lock_init(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3335 | mutex_init(&ctx->mutex); |
Mark Rutland | 2fde4f9 | 2015-01-07 15:01:54 +0000 | [diff] [blame] | 3336 | INIT_LIST_HEAD(&ctx->active_ctx_list); |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 3337 | INIT_LIST_HEAD(&ctx->pinned_groups); |
| 3338 | INIT_LIST_HEAD(&ctx->flexible_groups); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3339 | INIT_LIST_HEAD(&ctx->event_list); |
| 3340 | atomic_set(&ctx->refcount, 1); |
Jiri Olsa | fadfe7b | 2014-08-01 14:33:02 +0200 | [diff] [blame] | 3341 | INIT_DELAYED_WORK(&ctx->orphans_remove, orphans_remove_work); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3342 | } |
| 3343 | |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 3344 | static struct perf_event_context * |
| 3345 | alloc_perf_context(struct pmu *pmu, struct task_struct *task) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3346 | { |
| 3347 | struct perf_event_context *ctx; |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 3348 | |
| 3349 | ctx = kzalloc(sizeof(struct perf_event_context), GFP_KERNEL); |
| 3350 | if (!ctx) |
| 3351 | return NULL; |
| 3352 | |
| 3353 | __perf_event_init_context(ctx); |
| 3354 | if (task) { |
| 3355 | ctx->task = task; |
| 3356 | get_task_struct(task); |
| 3357 | } |
| 3358 | ctx->pmu = pmu; |
| 3359 | |
| 3360 | return ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3361 | } |
| 3362 | |
Matt Helsley | 2ebd4ff | 2010-09-13 13:01:19 -0700 | [diff] [blame] | 3363 | static struct task_struct * |
| 3364 | find_lively_task_by_vpid(pid_t vpid) |
| 3365 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3366 | struct task_struct *task; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3367 | int err; |
| 3368 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3369 | rcu_read_lock(); |
Matt Helsley | 2ebd4ff | 2010-09-13 13:01:19 -0700 | [diff] [blame] | 3370 | if (!vpid) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3371 | task = current; |
| 3372 | else |
Matt Helsley | 2ebd4ff | 2010-09-13 13:01:19 -0700 | [diff] [blame] | 3373 | task = find_task_by_vpid(vpid); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3374 | if (task) |
| 3375 | get_task_struct(task); |
| 3376 | rcu_read_unlock(); |
| 3377 | |
| 3378 | if (!task) |
| 3379 | return ERR_PTR(-ESRCH); |
| 3380 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3381 | /* Reuse ptrace permission checks for now. */ |
| 3382 | err = -EACCES; |
| 3383 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
| 3384 | goto errout; |
| 3385 | |
Matt Helsley | 2ebd4ff | 2010-09-13 13:01:19 -0700 | [diff] [blame] | 3386 | return task; |
| 3387 | errout: |
| 3388 | put_task_struct(task); |
| 3389 | return ERR_PTR(err); |
| 3390 | |
| 3391 | } |
| 3392 | |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 3393 | /* |
| 3394 | * Returns a matching context with refcount and pincount. |
| 3395 | */ |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 3396 | static struct perf_event_context * |
Yan, Zheng | 4af57ef28 | 2014-11-04 21:56:01 -0500 | [diff] [blame] | 3397 | find_get_context(struct pmu *pmu, struct task_struct *task, |
| 3398 | struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3399 | { |
Peter Zijlstra | 211de6e | 2014-09-30 19:23:08 +0200 | [diff] [blame] | 3400 | struct perf_event_context *ctx, *clone_ctx = NULL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3401 | struct perf_cpu_context *cpuctx; |
Yan, Zheng | 4af57ef28 | 2014-11-04 21:56:01 -0500 | [diff] [blame] | 3402 | void *task_ctx_data = NULL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3403 | unsigned long flags; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 3404 | int ctxn, err; |
Yan, Zheng | 4af57ef28 | 2014-11-04 21:56:01 -0500 | [diff] [blame] | 3405 | int cpu = event->cpu; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3406 | |
Oleg Nesterov | 22a4ec7 | 2011-01-18 17:10:08 +0100 | [diff] [blame] | 3407 | if (!task) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3408 | /* Must be root to operate on a CPU event: */ |
| 3409 | if (perf_paranoid_cpu() && !capable(CAP_SYS_ADMIN)) |
| 3410 | return ERR_PTR(-EACCES); |
| 3411 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3412 | /* |
| 3413 | * We could be clever and allow to attach a event to an |
| 3414 | * offline CPU and activate it when the CPU comes up, but |
| 3415 | * that's for later. |
| 3416 | */ |
| 3417 | if (!cpu_online(cpu)) |
| 3418 | return ERR_PTR(-ENODEV); |
| 3419 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 3420 | cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3421 | ctx = &cpuctx->ctx; |
| 3422 | get_ctx(ctx); |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 3423 | ++ctx->pin_count; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3424 | |
| 3425 | return ctx; |
| 3426 | } |
| 3427 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 3428 | err = -EINVAL; |
| 3429 | ctxn = pmu->task_ctx_nr; |
| 3430 | if (ctxn < 0) |
| 3431 | goto errout; |
| 3432 | |
Yan, Zheng | 4af57ef28 | 2014-11-04 21:56:01 -0500 | [diff] [blame] | 3433 | if (event->attach_state & PERF_ATTACH_TASK_DATA) { |
| 3434 | task_ctx_data = kzalloc(pmu->task_ctx_size, GFP_KERNEL); |
| 3435 | if (!task_ctx_data) { |
| 3436 | err = -ENOMEM; |
| 3437 | goto errout; |
| 3438 | } |
| 3439 | } |
| 3440 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 3441 | retry: |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 3442 | ctx = perf_lock_task_context(task, ctxn, &flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3443 | if (ctx) { |
Peter Zijlstra | 211de6e | 2014-09-30 19:23:08 +0200 | [diff] [blame] | 3444 | clone_ctx = unclone_ctx(ctx); |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 3445 | ++ctx->pin_count; |
Yan, Zheng | 4af57ef28 | 2014-11-04 21:56:01 -0500 | [diff] [blame] | 3446 | |
| 3447 | if (task_ctx_data && !ctx->task_ctx_data) { |
| 3448 | ctx->task_ctx_data = task_ctx_data; |
| 3449 | task_ctx_data = NULL; |
| 3450 | } |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 3451 | raw_spin_unlock_irqrestore(&ctx->lock, flags); |
Peter Zijlstra | 211de6e | 2014-09-30 19:23:08 +0200 | [diff] [blame] | 3452 | |
| 3453 | if (clone_ctx) |
| 3454 | put_ctx(clone_ctx); |
Peter Zijlstra | 9137fb2 | 2011-04-09 21:17:41 +0200 | [diff] [blame] | 3455 | } else { |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 3456 | ctx = alloc_perf_context(pmu, task); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3457 | err = -ENOMEM; |
| 3458 | if (!ctx) |
| 3459 | goto errout; |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 3460 | |
Yan, Zheng | 4af57ef28 | 2014-11-04 21:56:01 -0500 | [diff] [blame] | 3461 | if (task_ctx_data) { |
| 3462 | ctx->task_ctx_data = task_ctx_data; |
| 3463 | task_ctx_data = NULL; |
| 3464 | } |
| 3465 | |
Oleg Nesterov | dbe08d8 | 2011-01-19 19:22:07 +0100 | [diff] [blame] | 3466 | err = 0; |
| 3467 | mutex_lock(&task->perf_event_mutex); |
| 3468 | /* |
| 3469 | * If it has already passed perf_event_exit_task(). |
| 3470 | * we must see PF_EXITING, it takes this mutex too. |
| 3471 | */ |
| 3472 | if (task->flags & PF_EXITING) |
| 3473 | err = -ESRCH; |
| 3474 | else if (task->perf_event_ctxp[ctxn]) |
| 3475 | err = -EAGAIN; |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 3476 | else { |
Peter Zijlstra | 9137fb2 | 2011-04-09 21:17:41 +0200 | [diff] [blame] | 3477 | get_ctx(ctx); |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 3478 | ++ctx->pin_count; |
Oleg Nesterov | dbe08d8 | 2011-01-19 19:22:07 +0100 | [diff] [blame] | 3479 | rcu_assign_pointer(task->perf_event_ctxp[ctxn], ctx); |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 3480 | } |
Oleg Nesterov | dbe08d8 | 2011-01-19 19:22:07 +0100 | [diff] [blame] | 3481 | mutex_unlock(&task->perf_event_mutex); |
| 3482 | |
| 3483 | if (unlikely(err)) { |
Peter Zijlstra | 9137fb2 | 2011-04-09 21:17:41 +0200 | [diff] [blame] | 3484 | put_ctx(ctx); |
Oleg Nesterov | dbe08d8 | 2011-01-19 19:22:07 +0100 | [diff] [blame] | 3485 | |
| 3486 | if (err == -EAGAIN) |
| 3487 | goto retry; |
| 3488 | goto errout; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3489 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3490 | } |
| 3491 | |
Yan, Zheng | 4af57ef28 | 2014-11-04 21:56:01 -0500 | [diff] [blame] | 3492 | kfree(task_ctx_data); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3493 | return ctx; |
| 3494 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 3495 | errout: |
Yan, Zheng | 4af57ef28 | 2014-11-04 21:56:01 -0500 | [diff] [blame] | 3496 | kfree(task_ctx_data); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3497 | return ERR_PTR(err); |
| 3498 | } |
| 3499 | |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 3500 | static void perf_event_free_filter(struct perf_event *event); |
Alexei Starovoitov | 2541517 | 2015-03-25 12:49:20 -0700 | [diff] [blame] | 3501 | static void perf_event_free_bpf_prog(struct perf_event *event); |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 3502 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3503 | static void free_event_rcu(struct rcu_head *head) |
| 3504 | { |
| 3505 | struct perf_event *event; |
| 3506 | |
| 3507 | event = container_of(head, struct perf_event, rcu_head); |
| 3508 | if (event->ns) |
| 3509 | put_pid_ns(event->ns); |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 3510 | perf_event_free_filter(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3511 | kfree(event); |
| 3512 | } |
| 3513 | |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 3514 | static void ring_buffer_attach(struct perf_event *event, |
| 3515 | struct ring_buffer *rb); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3516 | |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 3517 | static void unaccount_event_cpu(struct perf_event *event, int cpu) |
| 3518 | { |
| 3519 | if (event->parent) |
| 3520 | return; |
| 3521 | |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 3522 | if (is_cgroup_event(event)) |
| 3523 | atomic_dec(&per_cpu(perf_cgroup_events, cpu)); |
| 3524 | } |
| 3525 | |
| 3526 | static void unaccount_event(struct perf_event *event) |
| 3527 | { |
Peter Zijlstra | 25432ae | 2016-01-08 11:05:09 +0100 | [diff] [blame] | 3528 | bool dec = false; |
| 3529 | |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 3530 | if (event->parent) |
| 3531 | return; |
| 3532 | |
| 3533 | if (event->attach_state & PERF_ATTACH_TASK) |
Peter Zijlstra | 25432ae | 2016-01-08 11:05:09 +0100 | [diff] [blame] | 3534 | dec = true; |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 3535 | if (event->attr.mmap || event->attr.mmap_data) |
| 3536 | atomic_dec(&nr_mmap_events); |
| 3537 | if (event->attr.comm) |
| 3538 | atomic_dec(&nr_comm_events); |
| 3539 | if (event->attr.task) |
| 3540 | atomic_dec(&nr_task_events); |
Frederic Weisbecker | 948b26b | 2013-08-02 18:29:55 +0200 | [diff] [blame] | 3541 | if (event->attr.freq) |
| 3542 | atomic_dec(&nr_freq_events); |
Adrian Hunter | 45ac140 | 2015-07-21 12:44:02 +0300 | [diff] [blame] | 3543 | if (event->attr.context_switch) { |
Peter Zijlstra | 25432ae | 2016-01-08 11:05:09 +0100 | [diff] [blame] | 3544 | dec = true; |
Adrian Hunter | 45ac140 | 2015-07-21 12:44:02 +0300 | [diff] [blame] | 3545 | atomic_dec(&nr_switch_events); |
| 3546 | } |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 3547 | if (is_cgroup_event(event)) |
Peter Zijlstra | 25432ae | 2016-01-08 11:05:09 +0100 | [diff] [blame] | 3548 | dec = true; |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 3549 | if (has_branch_stack(event)) |
Peter Zijlstra | 25432ae | 2016-01-08 11:05:09 +0100 | [diff] [blame] | 3550 | dec = true; |
| 3551 | |
| 3552 | if (dec) |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 3553 | static_key_slow_dec_deferred(&perf_sched_events); |
| 3554 | |
| 3555 | unaccount_event_cpu(event, event->cpu); |
| 3556 | } |
| 3557 | |
Alexander Shishkin | bed5b25 | 2015-01-30 12:31:06 +0200 | [diff] [blame] | 3558 | /* |
| 3559 | * The following implement mutual exclusion of events on "exclusive" pmus |
| 3560 | * (PERF_PMU_CAP_EXCLUSIVE). Such pmus can only have one event scheduled |
| 3561 | * at a time, so we disallow creating events that might conflict, namely: |
| 3562 | * |
| 3563 | * 1) cpu-wide events in the presence of per-task events, |
| 3564 | * 2) per-task events in the presence of cpu-wide events, |
| 3565 | * 3) two matching events on the same context. |
| 3566 | * |
| 3567 | * The former two cases are handled in the allocation path (perf_event_alloc(), |
| 3568 | * __free_event()), the latter -- before the first perf_install_in_context(). |
| 3569 | */ |
| 3570 | static int exclusive_event_init(struct perf_event *event) |
| 3571 | { |
| 3572 | struct pmu *pmu = event->pmu; |
| 3573 | |
| 3574 | if (!(pmu->capabilities & PERF_PMU_CAP_EXCLUSIVE)) |
| 3575 | return 0; |
| 3576 | |
| 3577 | /* |
| 3578 | * Prevent co-existence of per-task and cpu-wide events on the |
| 3579 | * same exclusive pmu. |
| 3580 | * |
| 3581 | * Negative pmu::exclusive_cnt means there are cpu-wide |
| 3582 | * events on this "exclusive" pmu, positive means there are |
| 3583 | * per-task events. |
| 3584 | * |
| 3585 | * Since this is called in perf_event_alloc() path, event::ctx |
| 3586 | * doesn't exist yet; it is, however, safe to use PERF_ATTACH_TASK |
| 3587 | * to mean "per-task event", because unlike other attach states it |
| 3588 | * never gets cleared. |
| 3589 | */ |
| 3590 | if (event->attach_state & PERF_ATTACH_TASK) { |
| 3591 | if (!atomic_inc_unless_negative(&pmu->exclusive_cnt)) |
| 3592 | return -EBUSY; |
| 3593 | } else { |
| 3594 | if (!atomic_dec_unless_positive(&pmu->exclusive_cnt)) |
| 3595 | return -EBUSY; |
| 3596 | } |
| 3597 | |
| 3598 | return 0; |
| 3599 | } |
| 3600 | |
| 3601 | static void exclusive_event_destroy(struct perf_event *event) |
| 3602 | { |
| 3603 | struct pmu *pmu = event->pmu; |
| 3604 | |
| 3605 | if (!(pmu->capabilities & PERF_PMU_CAP_EXCLUSIVE)) |
| 3606 | return; |
| 3607 | |
| 3608 | /* see comment in exclusive_event_init() */ |
| 3609 | if (event->attach_state & PERF_ATTACH_TASK) |
| 3610 | atomic_dec(&pmu->exclusive_cnt); |
| 3611 | else |
| 3612 | atomic_inc(&pmu->exclusive_cnt); |
| 3613 | } |
| 3614 | |
| 3615 | static bool exclusive_event_match(struct perf_event *e1, struct perf_event *e2) |
| 3616 | { |
| 3617 | if ((e1->pmu->capabilities & PERF_PMU_CAP_EXCLUSIVE) && |
| 3618 | (e1->cpu == e2->cpu || |
| 3619 | e1->cpu == -1 || |
| 3620 | e2->cpu == -1)) |
| 3621 | return true; |
| 3622 | return false; |
| 3623 | } |
| 3624 | |
| 3625 | /* Called under the same ctx::mutex as perf_install_in_context() */ |
| 3626 | static bool exclusive_event_installable(struct perf_event *event, |
| 3627 | struct perf_event_context *ctx) |
| 3628 | { |
| 3629 | struct perf_event *iter_event; |
| 3630 | struct pmu *pmu = event->pmu; |
| 3631 | |
| 3632 | if (!(pmu->capabilities & PERF_PMU_CAP_EXCLUSIVE)) |
| 3633 | return true; |
| 3634 | |
| 3635 | list_for_each_entry(iter_event, &ctx->event_list, event_entry) { |
| 3636 | if (exclusive_event_match(iter_event, event)) |
| 3637 | return false; |
| 3638 | } |
| 3639 | |
| 3640 | return true; |
| 3641 | } |
| 3642 | |
Frederic Weisbecker | 766d6c0 | 2013-07-23 02:31:01 +0200 | [diff] [blame] | 3643 | static void __free_event(struct perf_event *event) |
| 3644 | { |
| 3645 | if (!event->parent) { |
| 3646 | if (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN) |
| 3647 | put_callchain_buffers(); |
| 3648 | } |
| 3649 | |
Alexei Starovoitov | dead9f2 | 2015-05-15 12:15:21 -0700 | [diff] [blame] | 3650 | perf_event_free_bpf_prog(event); |
| 3651 | |
Frederic Weisbecker | 766d6c0 | 2013-07-23 02:31:01 +0200 | [diff] [blame] | 3652 | if (event->destroy) |
| 3653 | event->destroy(event); |
| 3654 | |
| 3655 | if (event->ctx) |
| 3656 | put_ctx(event->ctx); |
| 3657 | |
Alexander Shishkin | bed5b25 | 2015-01-30 12:31:06 +0200 | [diff] [blame] | 3658 | if (event->pmu) { |
| 3659 | exclusive_event_destroy(event); |
Yan, Zheng | c464c76 | 2014-03-18 16:56:41 +0800 | [diff] [blame] | 3660 | module_put(event->pmu->module); |
Alexander Shishkin | bed5b25 | 2015-01-30 12:31:06 +0200 | [diff] [blame] | 3661 | } |
Yan, Zheng | c464c76 | 2014-03-18 16:56:41 +0800 | [diff] [blame] | 3662 | |
Frederic Weisbecker | 766d6c0 | 2013-07-23 02:31:01 +0200 | [diff] [blame] | 3663 | call_rcu(&event->rcu_head, free_event_rcu); |
| 3664 | } |
Peter Zijlstra | 683ede4 | 2014-05-05 12:11:24 +0200 | [diff] [blame] | 3665 | |
| 3666 | static void _free_event(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3667 | { |
Peter Zijlstra | e360adb | 2010-10-14 14:01:34 +0800 | [diff] [blame] | 3668 | irq_work_sync(&event->pending); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3669 | |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 3670 | unaccount_event(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3671 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 3672 | if (event->rb) { |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 3673 | /* |
| 3674 | * Can happen when we close an event with re-directed output. |
| 3675 | * |
| 3676 | * Since we have a 0 refcount, perf_mmap_close() will skip |
| 3677 | * over us; possibly making our ring_buffer_put() the last. |
| 3678 | */ |
| 3679 | mutex_lock(&event->mmap_mutex); |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 3680 | ring_buffer_attach(event, NULL); |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 3681 | mutex_unlock(&event->mmap_mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3682 | } |
| 3683 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 3684 | if (is_cgroup_event(event)) |
| 3685 | perf_detach_cgroup(event); |
| 3686 | |
Frederic Weisbecker | 766d6c0 | 2013-07-23 02:31:01 +0200 | [diff] [blame] | 3687 | __free_event(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3688 | } |
| 3689 | |
Peter Zijlstra | 683ede4 | 2014-05-05 12:11:24 +0200 | [diff] [blame] | 3690 | /* |
| 3691 | * Used to free events which have a known refcount of 1, such as in error paths |
| 3692 | * where the event isn't exposed yet and inherited events. |
| 3693 | */ |
| 3694 | static void free_event(struct perf_event *event) |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 3695 | { |
Peter Zijlstra | 683ede4 | 2014-05-05 12:11:24 +0200 | [diff] [blame] | 3696 | if (WARN(atomic_long_cmpxchg(&event->refcount, 1, 0) != 1, |
| 3697 | "unexpected event refcount: %ld; ptr=%p\n", |
| 3698 | atomic_long_read(&event->refcount), event)) { |
| 3699 | /* leak to avoid use-after-free */ |
| 3700 | return; |
| 3701 | } |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 3702 | |
Peter Zijlstra | 683ede4 | 2014-05-05 12:11:24 +0200 | [diff] [blame] | 3703 | _free_event(event); |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 3704 | } |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 3705 | |
Peter Zijlstra | a66a305 | 2009-11-23 11:37:23 +0100 | [diff] [blame] | 3706 | /* |
Jiri Olsa | f869776 | 2014-08-01 14:33:01 +0200 | [diff] [blame] | 3707 | * Remove user event from the owner task. |
Peter Zijlstra | a66a305 | 2009-11-23 11:37:23 +0100 | [diff] [blame] | 3708 | */ |
Jiri Olsa | f869776 | 2014-08-01 14:33:01 +0200 | [diff] [blame] | 3709 | static void perf_remove_from_owner(struct perf_event *event) |
Peter Zijlstra | a66a305 | 2009-11-23 11:37:23 +0100 | [diff] [blame] | 3710 | { |
Peter Zijlstra | 8882135 | 2010-11-09 19:01:43 +0100 | [diff] [blame] | 3711 | struct task_struct *owner; |
Peter Zijlstra | a66a305 | 2009-11-23 11:37:23 +0100 | [diff] [blame] | 3712 | |
Peter Zijlstra | 8882135 | 2010-11-09 19:01:43 +0100 | [diff] [blame] | 3713 | rcu_read_lock(); |
| 3714 | owner = ACCESS_ONCE(event->owner); |
| 3715 | /* |
| 3716 | * Matches the smp_wmb() in perf_event_exit_task(). If we observe |
| 3717 | * !owner it means the list deletion is complete and we can indeed |
| 3718 | * free this event, otherwise we need to serialize on |
| 3719 | * owner->perf_event_mutex. |
| 3720 | */ |
| 3721 | smp_read_barrier_depends(); |
| 3722 | if (owner) { |
| 3723 | /* |
| 3724 | * Since delayed_put_task_struct() also drops the last |
| 3725 | * task reference we can safely take a new reference |
| 3726 | * while holding the rcu_read_lock(). |
| 3727 | */ |
| 3728 | get_task_struct(owner); |
| 3729 | } |
| 3730 | rcu_read_unlock(); |
| 3731 | |
| 3732 | if (owner) { |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 3733 | /* |
| 3734 | * If we're here through perf_event_exit_task() we're already |
| 3735 | * holding ctx->mutex which would be an inversion wrt. the |
| 3736 | * normal lock order. |
| 3737 | * |
| 3738 | * However we can safely take this lock because its the child |
| 3739 | * ctx->mutex. |
| 3740 | */ |
| 3741 | mutex_lock_nested(&owner->perf_event_mutex, SINGLE_DEPTH_NESTING); |
| 3742 | |
Peter Zijlstra | 8882135 | 2010-11-09 19:01:43 +0100 | [diff] [blame] | 3743 | /* |
| 3744 | * We have to re-check the event->owner field, if it is cleared |
| 3745 | * we raced with perf_event_exit_task(), acquiring the mutex |
| 3746 | * ensured they're done, and we can proceed with freeing the |
| 3747 | * event. |
| 3748 | */ |
| 3749 | if (event->owner) |
| 3750 | list_del_init(&event->owner_entry); |
| 3751 | mutex_unlock(&owner->perf_event_mutex); |
| 3752 | put_task_struct(owner); |
| 3753 | } |
Jiri Olsa | f869776 | 2014-08-01 14:33:01 +0200 | [diff] [blame] | 3754 | } |
| 3755 | |
Jiri Olsa | f869776 | 2014-08-01 14:33:01 +0200 | [diff] [blame] | 3756 | static void put_event(struct perf_event *event) |
| 3757 | { |
Peter Zijlstra | a83fe28 | 2015-01-29 14:44:34 +0100 | [diff] [blame] | 3758 | struct perf_event_context *ctx; |
Jiri Olsa | f869776 | 2014-08-01 14:33:01 +0200 | [diff] [blame] | 3759 | |
| 3760 | if (!atomic_long_dec_and_test(&event->refcount)) |
| 3761 | return; |
| 3762 | |
| 3763 | if (!is_kernel_event(event)) |
| 3764 | perf_remove_from_owner(event); |
Peter Zijlstra | 8882135 | 2010-11-09 19:01:43 +0100 | [diff] [blame] | 3765 | |
Peter Zijlstra | 683ede4 | 2014-05-05 12:11:24 +0200 | [diff] [blame] | 3766 | /* |
| 3767 | * There are two ways this annotation is useful: |
| 3768 | * |
| 3769 | * 1) there is a lock recursion from perf_event_exit_task |
| 3770 | * see the comment there. |
| 3771 | * |
| 3772 | * 2) there is a lock-inversion with mmap_sem through |
Peter Zijlstra (Intel) | b15f495 | 2015-09-03 20:07:47 -0700 | [diff] [blame] | 3773 | * perf_read_group(), which takes faults while |
Peter Zijlstra | 683ede4 | 2014-05-05 12:11:24 +0200 | [diff] [blame] | 3774 | * holding ctx->mutex, however this is called after |
| 3775 | * the last filedesc died, so there is no possibility |
| 3776 | * to trigger the AB-BA case. |
| 3777 | */ |
Peter Zijlstra | a83fe28 | 2015-01-29 14:44:34 +0100 | [diff] [blame] | 3778 | ctx = perf_event_ctx_lock_nested(event, SINGLE_DEPTH_NESTING); |
| 3779 | WARN_ON_ONCE(ctx->parent_ctx); |
Peter Zijlstra | 683ede4 | 2014-05-05 12:11:24 +0200 | [diff] [blame] | 3780 | perf_remove_from_context(event, true); |
Leon Yu | d415a7f | 2015-02-26 20:43:33 +0800 | [diff] [blame] | 3781 | perf_event_ctx_unlock(event, ctx); |
Peter Zijlstra | 683ede4 | 2014-05-05 12:11:24 +0200 | [diff] [blame] | 3782 | |
| 3783 | _free_event(event); |
Al Viro | a6fa941 | 2012-08-20 14:59:25 +0100 | [diff] [blame] | 3784 | } |
| 3785 | |
Peter Zijlstra | 683ede4 | 2014-05-05 12:11:24 +0200 | [diff] [blame] | 3786 | int perf_event_release_kernel(struct perf_event *event) |
| 3787 | { |
| 3788 | put_event(event); |
| 3789 | return 0; |
| 3790 | } |
| 3791 | EXPORT_SYMBOL_GPL(perf_event_release_kernel); |
| 3792 | |
Peter Zijlstra | 8b10c5e | 2015-05-01 16:08:46 +0200 | [diff] [blame] | 3793 | /* |
| 3794 | * Called when the last reference to the file is gone. |
| 3795 | */ |
Al Viro | a6fa941 | 2012-08-20 14:59:25 +0100 | [diff] [blame] | 3796 | static int perf_release(struct inode *inode, struct file *file) |
| 3797 | { |
| 3798 | put_event(file->private_data); |
| 3799 | return 0; |
Peter Zijlstra | a66a305 | 2009-11-23 11:37:23 +0100 | [diff] [blame] | 3800 | } |
| 3801 | |
Jiri Olsa | fadfe7b | 2014-08-01 14:33:02 +0200 | [diff] [blame] | 3802 | /* |
| 3803 | * Remove all orphanes events from the context. |
| 3804 | */ |
| 3805 | static void orphans_remove_work(struct work_struct *work) |
| 3806 | { |
| 3807 | struct perf_event_context *ctx; |
| 3808 | struct perf_event *event, *tmp; |
| 3809 | |
| 3810 | ctx = container_of(work, struct perf_event_context, |
| 3811 | orphans_remove.work); |
| 3812 | |
| 3813 | mutex_lock(&ctx->mutex); |
| 3814 | list_for_each_entry_safe(event, tmp, &ctx->event_list, event_entry) { |
| 3815 | struct perf_event *parent_event = event->parent; |
| 3816 | |
| 3817 | if (!is_orphaned_child(event)) |
| 3818 | continue; |
| 3819 | |
| 3820 | perf_remove_from_context(event, true); |
| 3821 | |
| 3822 | mutex_lock(&parent_event->child_mutex); |
| 3823 | list_del_init(&event->child_list); |
| 3824 | mutex_unlock(&parent_event->child_mutex); |
| 3825 | |
| 3826 | free_event(event); |
| 3827 | put_event(parent_event); |
| 3828 | } |
| 3829 | |
| 3830 | raw_spin_lock_irq(&ctx->lock); |
| 3831 | ctx->orphans_remove_sched = false; |
| 3832 | raw_spin_unlock_irq(&ctx->lock); |
| 3833 | mutex_unlock(&ctx->mutex); |
| 3834 | |
| 3835 | put_ctx(ctx); |
| 3836 | } |
| 3837 | |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 3838 | u64 perf_event_read_value(struct perf_event *event, u64 *enabled, u64 *running) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3839 | { |
| 3840 | struct perf_event *child; |
| 3841 | u64 total = 0; |
| 3842 | |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 3843 | *enabled = 0; |
| 3844 | *running = 0; |
| 3845 | |
Peter Zijlstra | 6f10581 | 2009-11-20 22:19:56 +0100 | [diff] [blame] | 3846 | mutex_lock(&event->child_mutex); |
Sukadev Bhattiprolu | 01add3e | 2015-09-03 20:07:46 -0700 | [diff] [blame] | 3847 | |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3848 | (void)perf_event_read(event, false); |
Sukadev Bhattiprolu | 01add3e | 2015-09-03 20:07:46 -0700 | [diff] [blame] | 3849 | total += perf_event_count(event); |
| 3850 | |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 3851 | *enabled += event->total_time_enabled + |
| 3852 | atomic64_read(&event->child_total_time_enabled); |
| 3853 | *running += event->total_time_running + |
| 3854 | atomic64_read(&event->child_total_time_running); |
| 3855 | |
| 3856 | list_for_each_entry(child, &event->child_list, child_list) { |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3857 | (void)perf_event_read(child, false); |
Sukadev Bhattiprolu | 01add3e | 2015-09-03 20:07:46 -0700 | [diff] [blame] | 3858 | total += perf_event_count(child); |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 3859 | *enabled += child->total_time_enabled; |
| 3860 | *running += child->total_time_running; |
| 3861 | } |
Peter Zijlstra | 6f10581 | 2009-11-20 22:19:56 +0100 | [diff] [blame] | 3862 | mutex_unlock(&event->child_mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3863 | |
| 3864 | return total; |
| 3865 | } |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 3866 | EXPORT_SYMBOL_GPL(perf_event_read_value); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3867 | |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3868 | static int __perf_read_group_add(struct perf_event *leader, |
Peter Zijlstra | fa8c269 | 2015-09-03 20:07:49 -0700 | [diff] [blame] | 3869 | u64 read_format, u64 *values) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3870 | { |
Peter Zijlstra | fa8c269 | 2015-09-03 20:07:49 -0700 | [diff] [blame] | 3871 | struct perf_event *sub; |
| 3872 | int n = 1; /* skip @nr */ |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3873 | int ret; |
Peter Zijlstra | abf4868 | 2009-11-20 22:19:49 +0100 | [diff] [blame] | 3874 | |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3875 | ret = perf_event_read(leader, true); |
| 3876 | if (ret) |
| 3877 | return ret; |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 3878 | |
Peter Zijlstra | fa8c269 | 2015-09-03 20:07:49 -0700 | [diff] [blame] | 3879 | /* |
| 3880 | * Since we co-schedule groups, {enabled,running} times of siblings |
| 3881 | * will be identical to those of the leader, so we only publish one |
| 3882 | * set. |
| 3883 | */ |
| 3884 | if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { |
| 3885 | values[n++] += leader->total_time_enabled + |
| 3886 | atomic64_read(&leader->child_total_time_enabled); |
| 3887 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3888 | |
Peter Zijlstra | fa8c269 | 2015-09-03 20:07:49 -0700 | [diff] [blame] | 3889 | if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { |
| 3890 | values[n++] += leader->total_time_running + |
| 3891 | atomic64_read(&leader->child_total_time_running); |
| 3892 | } |
| 3893 | |
| 3894 | /* |
| 3895 | * Write {count,id} tuples for every sibling. |
| 3896 | */ |
| 3897 | values[n++] += perf_event_count(leader); |
Peter Zijlstra | abf4868 | 2009-11-20 22:19:49 +0100 | [diff] [blame] | 3898 | if (read_format & PERF_FORMAT_ID) |
| 3899 | values[n++] = primary_event_id(leader); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3900 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3901 | list_for_each_entry(sub, &leader->sibling_list, group_entry) { |
Peter Zijlstra | fa8c269 | 2015-09-03 20:07:49 -0700 | [diff] [blame] | 3902 | values[n++] += perf_event_count(sub); |
Peter Zijlstra | abf4868 | 2009-11-20 22:19:49 +0100 | [diff] [blame] | 3903 | if (read_format & PERF_FORMAT_ID) |
| 3904 | values[n++] = primary_event_id(sub); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3905 | } |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3906 | |
| 3907 | return 0; |
Peter Zijlstra | fa8c269 | 2015-09-03 20:07:49 -0700 | [diff] [blame] | 3908 | } |
| 3909 | |
| 3910 | static int perf_read_group(struct perf_event *event, |
| 3911 | u64 read_format, char __user *buf) |
| 3912 | { |
| 3913 | struct perf_event *leader = event->group_leader, *child; |
| 3914 | struct perf_event_context *ctx = leader->ctx; |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3915 | int ret; |
Peter Zijlstra | fa8c269 | 2015-09-03 20:07:49 -0700 | [diff] [blame] | 3916 | u64 *values; |
| 3917 | |
| 3918 | lockdep_assert_held(&ctx->mutex); |
| 3919 | |
| 3920 | values = kzalloc(event->read_size, GFP_KERNEL); |
| 3921 | if (!values) |
| 3922 | return -ENOMEM; |
| 3923 | |
| 3924 | values[0] = 1 + leader->nr_siblings; |
| 3925 | |
| 3926 | /* |
| 3927 | * By locking the child_mutex of the leader we effectively |
| 3928 | * lock the child list of all siblings.. XXX explain how. |
| 3929 | */ |
| 3930 | mutex_lock(&leader->child_mutex); |
| 3931 | |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3932 | ret = __perf_read_group_add(leader, read_format, values); |
| 3933 | if (ret) |
| 3934 | goto unlock; |
| 3935 | |
| 3936 | list_for_each_entry(child, &leader->child_list, child_list) { |
| 3937 | ret = __perf_read_group_add(child, read_format, values); |
| 3938 | if (ret) |
| 3939 | goto unlock; |
| 3940 | } |
Peter Zijlstra | fa8c269 | 2015-09-03 20:07:49 -0700 | [diff] [blame] | 3941 | |
| 3942 | mutex_unlock(&leader->child_mutex); |
| 3943 | |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3944 | ret = event->read_size; |
Peter Zijlstra | fa8c269 | 2015-09-03 20:07:49 -0700 | [diff] [blame] | 3945 | if (copy_to_user(buf, values, event->read_size)) |
| 3946 | ret = -EFAULT; |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3947 | goto out; |
Peter Zijlstra | fa8c269 | 2015-09-03 20:07:49 -0700 | [diff] [blame] | 3948 | |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 3949 | unlock: |
| 3950 | mutex_unlock(&leader->child_mutex); |
| 3951 | out: |
Peter Zijlstra | fa8c269 | 2015-09-03 20:07:49 -0700 | [diff] [blame] | 3952 | kfree(values); |
Peter Zijlstra | abf4868 | 2009-11-20 22:19:49 +0100 | [diff] [blame] | 3953 | return ret; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3954 | } |
| 3955 | |
Peter Zijlstra (Intel) | b15f495 | 2015-09-03 20:07:47 -0700 | [diff] [blame] | 3956 | static int perf_read_one(struct perf_event *event, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3957 | u64 read_format, char __user *buf) |
| 3958 | { |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 3959 | u64 enabled, running; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3960 | u64 values[4]; |
| 3961 | int n = 0; |
| 3962 | |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 3963 | values[n++] = perf_event_read_value(event, &enabled, &running); |
| 3964 | if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) |
| 3965 | values[n++] = enabled; |
| 3966 | if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) |
| 3967 | values[n++] = running; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3968 | if (read_format & PERF_FORMAT_ID) |
| 3969 | values[n++] = primary_event_id(event); |
| 3970 | |
| 3971 | if (copy_to_user(buf, values, n * sizeof(u64))) |
| 3972 | return -EFAULT; |
| 3973 | |
| 3974 | return n * sizeof(u64); |
| 3975 | } |
| 3976 | |
Jiri Olsa | dc63398 | 2014-09-12 13:18:26 +0200 | [diff] [blame] | 3977 | static bool is_event_hup(struct perf_event *event) |
| 3978 | { |
| 3979 | bool no_children; |
| 3980 | |
| 3981 | if (event->state != PERF_EVENT_STATE_EXIT) |
| 3982 | return false; |
| 3983 | |
| 3984 | mutex_lock(&event->child_mutex); |
| 3985 | no_children = list_empty(&event->child_list); |
| 3986 | mutex_unlock(&event->child_mutex); |
| 3987 | return no_children; |
| 3988 | } |
| 3989 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3990 | /* |
| 3991 | * Read the performance event - simple non blocking version for now |
| 3992 | */ |
| 3993 | static ssize_t |
Peter Zijlstra (Intel) | b15f495 | 2015-09-03 20:07:47 -0700 | [diff] [blame] | 3994 | __perf_read(struct perf_event *event, char __user *buf, size_t count) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3995 | { |
| 3996 | u64 read_format = event->attr.read_format; |
| 3997 | int ret; |
| 3998 | |
| 3999 | /* |
| 4000 | * Return end-of-file for a read on a event that is in |
| 4001 | * error state (i.e. because it was pinned but it couldn't be |
| 4002 | * scheduled on to the CPU at some point). |
| 4003 | */ |
| 4004 | if (event->state == PERF_EVENT_STATE_ERROR) |
| 4005 | return 0; |
| 4006 | |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 4007 | if (count < event->read_size) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4008 | return -ENOSPC; |
| 4009 | |
| 4010 | WARN_ON_ONCE(event->ctx->parent_ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4011 | if (read_format & PERF_FORMAT_GROUP) |
Peter Zijlstra (Intel) | b15f495 | 2015-09-03 20:07:47 -0700 | [diff] [blame] | 4012 | ret = perf_read_group(event, read_format, buf); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4013 | else |
Peter Zijlstra (Intel) | b15f495 | 2015-09-03 20:07:47 -0700 | [diff] [blame] | 4014 | ret = perf_read_one(event, read_format, buf); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4015 | |
| 4016 | return ret; |
| 4017 | } |
| 4018 | |
| 4019 | static ssize_t |
| 4020 | perf_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
| 4021 | { |
| 4022 | struct perf_event *event = file->private_data; |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4023 | struct perf_event_context *ctx; |
| 4024 | int ret; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4025 | |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4026 | ctx = perf_event_ctx_lock(event); |
Peter Zijlstra (Intel) | b15f495 | 2015-09-03 20:07:47 -0700 | [diff] [blame] | 4027 | ret = __perf_read(event, buf, count); |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4028 | perf_event_ctx_unlock(event, ctx); |
| 4029 | |
| 4030 | return ret; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4031 | } |
| 4032 | |
| 4033 | static unsigned int perf_poll(struct file *file, poll_table *wait) |
| 4034 | { |
| 4035 | struct perf_event *event = file->private_data; |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4036 | struct ring_buffer *rb; |
Jiri Olsa | 61b6768 | 2014-08-13 19:39:56 +0200 | [diff] [blame] | 4037 | unsigned int events = POLLHUP; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4038 | |
Sebastian Andrzej Siewior | e708d7a | 2014-08-04 15:31:08 +0200 | [diff] [blame] | 4039 | poll_wait(file, &event->waitq, wait); |
Jiri Olsa | 179033b | 2014-08-07 11:48:26 -0400 | [diff] [blame] | 4040 | |
Jiri Olsa | dc63398 | 2014-09-12 13:18:26 +0200 | [diff] [blame] | 4041 | if (is_event_hup(event)) |
Jiri Olsa | 179033b | 2014-08-07 11:48:26 -0400 | [diff] [blame] | 4042 | return events; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4043 | |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 4044 | /* |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4045 | * Pin the event->rb by taking event->mmap_mutex; otherwise |
| 4046 | * perf_event_set_output() can swizzle our rb and make us miss wakeups. |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 4047 | */ |
| 4048 | mutex_lock(&event->mmap_mutex); |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4049 | rb = event->rb; |
| 4050 | if (rb) |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4051 | events = atomic_xchg(&rb->poll, 0); |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 4052 | mutex_unlock(&event->mmap_mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4053 | return events; |
| 4054 | } |
| 4055 | |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4056 | static void _perf_event_reset(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4057 | { |
Sukadev Bhattiprolu | 7d88962 | 2015-09-03 20:07:50 -0700 | [diff] [blame] | 4058 | (void)perf_event_read(event, false); |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 4059 | local64_set(&event->count, 0); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4060 | perf_event_update_userpage(event); |
| 4061 | } |
| 4062 | |
| 4063 | /* |
| 4064 | * Holding the top-level event's child_mutex means that any |
| 4065 | * descendant process that has inherited this event will block |
| 4066 | * in sync_child_event if it goes to exit, thus satisfying the |
| 4067 | * task existence requirements of perf_event_enable/disable. |
| 4068 | */ |
| 4069 | static void perf_event_for_each_child(struct perf_event *event, |
| 4070 | void (*func)(struct perf_event *)) |
| 4071 | { |
| 4072 | struct perf_event *child; |
| 4073 | |
| 4074 | WARN_ON_ONCE(event->ctx->parent_ctx); |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4075 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4076 | mutex_lock(&event->child_mutex); |
| 4077 | func(event); |
| 4078 | list_for_each_entry(child, &event->child_list, child_list) |
| 4079 | func(child); |
| 4080 | mutex_unlock(&event->child_mutex); |
| 4081 | } |
| 4082 | |
| 4083 | static void perf_event_for_each(struct perf_event *event, |
| 4084 | void (*func)(struct perf_event *)) |
| 4085 | { |
| 4086 | struct perf_event_context *ctx = event->ctx; |
| 4087 | struct perf_event *sibling; |
| 4088 | |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4089 | lockdep_assert_held(&ctx->mutex); |
| 4090 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4091 | event = event->group_leader; |
| 4092 | |
| 4093 | perf_event_for_each_child(event, func); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4094 | list_for_each_entry(sibling, &event->sibling_list, group_entry) |
Michael Ellerman | 724b6da | 2012-04-11 11:54:13 +1000 | [diff] [blame] | 4095 | perf_event_for_each_child(sibling, func); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4096 | } |
| 4097 | |
Peter Zijlstra | c7999c6 | 2015-08-04 19:22:49 +0200 | [diff] [blame] | 4098 | struct period_event { |
| 4099 | struct perf_event *event; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4100 | u64 value; |
Peter Zijlstra | c7999c6 | 2015-08-04 19:22:49 +0200 | [diff] [blame] | 4101 | }; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4102 | |
Peter Zijlstra | 0017960 | 2015-11-30 16:26:35 +0100 | [diff] [blame] | 4103 | static void ___perf_event_period(void *info) |
| 4104 | { |
| 4105 | struct period_event *pe = info; |
| 4106 | struct perf_event *event = pe->event; |
| 4107 | u64 value = pe->value; |
| 4108 | |
| 4109 | if (event->attr.freq) { |
| 4110 | event->attr.sample_freq = value; |
| 4111 | } else { |
| 4112 | event->attr.sample_period = value; |
| 4113 | event->hw.sample_period = value; |
| 4114 | } |
| 4115 | |
| 4116 | local64_set(&event->hw.period_left, 0); |
| 4117 | } |
| 4118 | |
Peter Zijlstra | c7999c6 | 2015-08-04 19:22:49 +0200 | [diff] [blame] | 4119 | static int __perf_event_period(void *info) |
| 4120 | { |
| 4121 | struct period_event *pe = info; |
| 4122 | struct perf_event *event = pe->event; |
| 4123 | struct perf_event_context *ctx = event->ctx; |
| 4124 | u64 value = pe->value; |
| 4125 | bool active; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4126 | |
Peter Zijlstra | c7999c6 | 2015-08-04 19:22:49 +0200 | [diff] [blame] | 4127 | raw_spin_lock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4128 | if (event->attr.freq) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4129 | event->attr.sample_freq = value; |
| 4130 | } else { |
| 4131 | event->attr.sample_period = value; |
| 4132 | event->hw.sample_period = value; |
| 4133 | } |
Peter Zijlstra | bad7192 | 2013-11-27 13:54:38 +0000 | [diff] [blame] | 4134 | |
| 4135 | active = (event->state == PERF_EVENT_STATE_ACTIVE); |
| 4136 | if (active) { |
| 4137 | perf_pmu_disable(ctx->pmu); |
| 4138 | event->pmu->stop(event, PERF_EF_UPDATE); |
| 4139 | } |
| 4140 | |
| 4141 | local64_set(&event->hw.period_left, 0); |
| 4142 | |
| 4143 | if (active) { |
| 4144 | event->pmu->start(event, PERF_EF_RELOAD); |
| 4145 | perf_pmu_enable(ctx->pmu); |
| 4146 | } |
Peter Zijlstra | c7999c6 | 2015-08-04 19:22:49 +0200 | [diff] [blame] | 4147 | raw_spin_unlock(&ctx->lock); |
Peter Zijlstra | bad7192 | 2013-11-27 13:54:38 +0000 | [diff] [blame] | 4148 | |
Peter Zijlstra | c7999c6 | 2015-08-04 19:22:49 +0200 | [diff] [blame] | 4149 | return 0; |
| 4150 | } |
| 4151 | |
| 4152 | static int perf_event_period(struct perf_event *event, u64 __user *arg) |
| 4153 | { |
| 4154 | struct period_event pe = { .event = event, }; |
Peter Zijlstra | c7999c6 | 2015-08-04 19:22:49 +0200 | [diff] [blame] | 4155 | u64 value; |
| 4156 | |
| 4157 | if (!is_sampling_event(event)) |
| 4158 | return -EINVAL; |
| 4159 | |
| 4160 | if (copy_from_user(&value, arg, sizeof(value))) |
| 4161 | return -EFAULT; |
| 4162 | |
| 4163 | if (!value) |
| 4164 | return -EINVAL; |
| 4165 | |
| 4166 | if (event->attr.freq && value > sysctl_perf_event_sample_rate) |
| 4167 | return -EINVAL; |
| 4168 | |
Peter Zijlstra | c7999c6 | 2015-08-04 19:22:49 +0200 | [diff] [blame] | 4169 | pe.value = value; |
| 4170 | |
Peter Zijlstra | 0017960 | 2015-11-30 16:26:35 +0100 | [diff] [blame] | 4171 | event_function_call(event, __perf_event_period, |
| 4172 | ___perf_event_period, &pe); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4173 | |
Peter Zijlstra | c7999c6 | 2015-08-04 19:22:49 +0200 | [diff] [blame] | 4174 | return 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4175 | } |
| 4176 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4177 | static const struct file_operations perf_fops; |
| 4178 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 4179 | static inline int perf_fget_light(int fd, struct fd *p) |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4180 | { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 4181 | struct fd f = fdget(fd); |
| 4182 | if (!f.file) |
| 4183 | return -EBADF; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4184 | |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 4185 | if (f.file->f_op != &perf_fops) { |
| 4186 | fdput(f); |
| 4187 | return -EBADF; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4188 | } |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 4189 | *p = f; |
| 4190 | return 0; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4191 | } |
| 4192 | |
| 4193 | static int perf_event_set_output(struct perf_event *event, |
| 4194 | struct perf_event *output_event); |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 4195 | static int perf_event_set_filter(struct perf_event *event, void __user *arg); |
Alexei Starovoitov | 2541517 | 2015-03-25 12:49:20 -0700 | [diff] [blame] | 4196 | static int perf_event_set_bpf_prog(struct perf_event *event, u32 prog_fd); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4197 | |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4198 | static long _perf_ioctl(struct perf_event *event, unsigned int cmd, unsigned long arg) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4199 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4200 | void (*func)(struct perf_event *); |
| 4201 | u32 flags = arg; |
| 4202 | |
| 4203 | switch (cmd) { |
| 4204 | case PERF_EVENT_IOC_ENABLE: |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4205 | func = _perf_event_enable; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4206 | break; |
| 4207 | case PERF_EVENT_IOC_DISABLE: |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4208 | func = _perf_event_disable; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4209 | break; |
| 4210 | case PERF_EVENT_IOC_RESET: |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4211 | func = _perf_event_reset; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4212 | break; |
| 4213 | |
| 4214 | case PERF_EVENT_IOC_REFRESH: |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4215 | return _perf_event_refresh(event, arg); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4216 | |
| 4217 | case PERF_EVENT_IOC_PERIOD: |
| 4218 | return perf_event_period(event, (u64 __user *)arg); |
| 4219 | |
Jiri Olsa | cf4957f | 2012-10-24 13:37:58 +0200 | [diff] [blame] | 4220 | case PERF_EVENT_IOC_ID: |
| 4221 | { |
| 4222 | u64 id = primary_event_id(event); |
| 4223 | |
| 4224 | if (copy_to_user((void __user *)arg, &id, sizeof(id))) |
| 4225 | return -EFAULT; |
| 4226 | return 0; |
| 4227 | } |
| 4228 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4229 | case PERF_EVENT_IOC_SET_OUTPUT: |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4230 | { |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4231 | int ret; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4232 | if (arg != -1) { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 4233 | struct perf_event *output_event; |
| 4234 | struct fd output; |
| 4235 | ret = perf_fget_light(arg, &output); |
| 4236 | if (ret) |
| 4237 | return ret; |
| 4238 | output_event = output.file->private_data; |
| 4239 | ret = perf_event_set_output(event, output_event); |
| 4240 | fdput(output); |
| 4241 | } else { |
| 4242 | ret = perf_event_set_output(event, NULL); |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4243 | } |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4244 | return ret; |
| 4245 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4246 | |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 4247 | case PERF_EVENT_IOC_SET_FILTER: |
| 4248 | return perf_event_set_filter(event, (void __user *)arg); |
| 4249 | |
Alexei Starovoitov | 2541517 | 2015-03-25 12:49:20 -0700 | [diff] [blame] | 4250 | case PERF_EVENT_IOC_SET_BPF: |
| 4251 | return perf_event_set_bpf_prog(event, arg); |
| 4252 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4253 | default: |
| 4254 | return -ENOTTY; |
| 4255 | } |
| 4256 | |
| 4257 | if (flags & PERF_IOC_FLAG_GROUP) |
| 4258 | perf_event_for_each(event, func); |
| 4259 | else |
| 4260 | perf_event_for_each_child(event, func); |
| 4261 | |
| 4262 | return 0; |
| 4263 | } |
| 4264 | |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4265 | static long perf_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 4266 | { |
| 4267 | struct perf_event *event = file->private_data; |
| 4268 | struct perf_event_context *ctx; |
| 4269 | long ret; |
| 4270 | |
| 4271 | ctx = perf_event_ctx_lock(event); |
| 4272 | ret = _perf_ioctl(event, cmd, arg); |
| 4273 | perf_event_ctx_unlock(event, ctx); |
| 4274 | |
| 4275 | return ret; |
| 4276 | } |
| 4277 | |
Pawel Moll | b3f2078 | 2014-06-13 16:03:32 +0100 | [diff] [blame] | 4278 | #ifdef CONFIG_COMPAT |
| 4279 | static long perf_compat_ioctl(struct file *file, unsigned int cmd, |
| 4280 | unsigned long arg) |
| 4281 | { |
| 4282 | switch (_IOC_NR(cmd)) { |
| 4283 | case _IOC_NR(PERF_EVENT_IOC_SET_FILTER): |
| 4284 | case _IOC_NR(PERF_EVENT_IOC_ID): |
| 4285 | /* Fix up pointer size (usually 4 -> 8 in 32-on-64-bit case */ |
| 4286 | if (_IOC_SIZE(cmd) == sizeof(compat_uptr_t)) { |
| 4287 | cmd &= ~IOCSIZE_MASK; |
| 4288 | cmd |= sizeof(void *) << IOCSIZE_SHIFT; |
| 4289 | } |
| 4290 | break; |
| 4291 | } |
| 4292 | return perf_ioctl(file, cmd, arg); |
| 4293 | } |
| 4294 | #else |
| 4295 | # define perf_compat_ioctl NULL |
| 4296 | #endif |
| 4297 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4298 | int perf_event_task_enable(void) |
| 4299 | { |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4300 | struct perf_event_context *ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4301 | struct perf_event *event; |
| 4302 | |
| 4303 | mutex_lock(¤t->perf_event_mutex); |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4304 | list_for_each_entry(event, ¤t->perf_event_list, owner_entry) { |
| 4305 | ctx = perf_event_ctx_lock(event); |
| 4306 | perf_event_for_each_child(event, _perf_event_enable); |
| 4307 | perf_event_ctx_unlock(event, ctx); |
| 4308 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4309 | mutex_unlock(¤t->perf_event_mutex); |
| 4310 | |
| 4311 | return 0; |
| 4312 | } |
| 4313 | |
| 4314 | int perf_event_task_disable(void) |
| 4315 | { |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4316 | struct perf_event_context *ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4317 | struct perf_event *event; |
| 4318 | |
| 4319 | mutex_lock(¤t->perf_event_mutex); |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 4320 | list_for_each_entry(event, ¤t->perf_event_list, owner_entry) { |
| 4321 | ctx = perf_event_ctx_lock(event); |
| 4322 | perf_event_for_each_child(event, _perf_event_disable); |
| 4323 | perf_event_ctx_unlock(event, ctx); |
| 4324 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4325 | mutex_unlock(¤t->perf_event_mutex); |
| 4326 | |
| 4327 | return 0; |
| 4328 | } |
| 4329 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4330 | static int perf_event_index(struct perf_event *event) |
| 4331 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 4332 | if (event->hw.state & PERF_HES_STOPPED) |
| 4333 | return 0; |
| 4334 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4335 | if (event->state != PERF_EVENT_STATE_ACTIVE) |
| 4336 | return 0; |
| 4337 | |
Peter Zijlstra | 35edc2a | 2011-11-20 20:36:02 +0100 | [diff] [blame] | 4338 | return event->pmu->event_idx(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4339 | } |
| 4340 | |
Eric B Munson | c479429 | 2011-06-23 16:34:38 -0400 | [diff] [blame] | 4341 | static void calc_timer_values(struct perf_event *event, |
Peter Zijlstra | e3f3541 | 2011-11-21 11:43:53 +0100 | [diff] [blame] | 4342 | u64 *now, |
Eric B Munson | 7f310a5 | 2011-06-23 16:34:38 -0400 | [diff] [blame] | 4343 | u64 *enabled, |
| 4344 | u64 *running) |
Eric B Munson | c479429 | 2011-06-23 16:34:38 -0400 | [diff] [blame] | 4345 | { |
Peter Zijlstra | e3f3541 | 2011-11-21 11:43:53 +0100 | [diff] [blame] | 4346 | u64 ctx_time; |
Eric B Munson | c479429 | 2011-06-23 16:34:38 -0400 | [diff] [blame] | 4347 | |
Peter Zijlstra | e3f3541 | 2011-11-21 11:43:53 +0100 | [diff] [blame] | 4348 | *now = perf_clock(); |
| 4349 | ctx_time = event->shadow_ctx_time + *now; |
Eric B Munson | c479429 | 2011-06-23 16:34:38 -0400 | [diff] [blame] | 4350 | *enabled = ctx_time - event->tstamp_enabled; |
| 4351 | *running = ctx_time - event->tstamp_running; |
| 4352 | } |
| 4353 | |
Peter Zijlstra | fa73158 | 2013-09-19 10:16:42 +0200 | [diff] [blame] | 4354 | static void perf_event_init_userpage(struct perf_event *event) |
| 4355 | { |
| 4356 | struct perf_event_mmap_page *userpg; |
| 4357 | struct ring_buffer *rb; |
| 4358 | |
| 4359 | rcu_read_lock(); |
| 4360 | rb = rcu_dereference(event->rb); |
| 4361 | if (!rb) |
| 4362 | goto unlock; |
| 4363 | |
| 4364 | userpg = rb->user_page; |
| 4365 | |
| 4366 | /* Allow new userspace to detect that bit 0 is deprecated */ |
| 4367 | userpg->cap_bit0_is_deprecated = 1; |
| 4368 | userpg->size = offsetof(struct perf_event_mmap_page, __reserved); |
Alexander Shishkin | e8c6dea | 2015-01-14 14:18:10 +0200 | [diff] [blame] | 4369 | userpg->data_offset = PAGE_SIZE; |
| 4370 | userpg->data_size = perf_data_size(rb); |
Peter Zijlstra | fa73158 | 2013-09-19 10:16:42 +0200 | [diff] [blame] | 4371 | |
| 4372 | unlock: |
| 4373 | rcu_read_unlock(); |
| 4374 | } |
| 4375 | |
Andy Lutomirski | c1317ec | 2014-10-24 15:58:11 -0700 | [diff] [blame] | 4376 | void __weak arch_perf_update_userpage( |
| 4377 | struct perf_event *event, struct perf_event_mmap_page *userpg, u64 now) |
Peter Zijlstra | e3f3541 | 2011-11-21 11:43:53 +0100 | [diff] [blame] | 4378 | { |
| 4379 | } |
| 4380 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4381 | /* |
| 4382 | * Callers need to ensure there can be no nesting of this function, otherwise |
| 4383 | * the seqlock logic goes bad. We can not serialize this because the arch |
| 4384 | * code calls this from NMI context. |
| 4385 | */ |
| 4386 | void perf_event_update_userpage(struct perf_event *event) |
| 4387 | { |
| 4388 | struct perf_event_mmap_page *userpg; |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4389 | struct ring_buffer *rb; |
Peter Zijlstra | e3f3541 | 2011-11-21 11:43:53 +0100 | [diff] [blame] | 4390 | u64 enabled, running, now; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4391 | |
| 4392 | rcu_read_lock(); |
Peter Zijlstra | 5ec4c59 | 2013-08-02 21:16:30 +0200 | [diff] [blame] | 4393 | rb = rcu_dereference(event->rb); |
| 4394 | if (!rb) |
| 4395 | goto unlock; |
| 4396 | |
Eric B Munson | 0d64120 | 2011-06-24 12:26:26 -0400 | [diff] [blame] | 4397 | /* |
| 4398 | * compute total_time_enabled, total_time_running |
| 4399 | * based on snapshot values taken when the event |
| 4400 | * was last scheduled in. |
| 4401 | * |
| 4402 | * we cannot simply called update_context_time() |
| 4403 | * because of locking issue as we can be called in |
| 4404 | * NMI context |
| 4405 | */ |
Peter Zijlstra | e3f3541 | 2011-11-21 11:43:53 +0100 | [diff] [blame] | 4406 | calc_timer_values(event, &now, &enabled, &running); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4407 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4408 | userpg = rb->user_page; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4409 | /* |
| 4410 | * Disable preemption so as to not let the corresponding user-space |
| 4411 | * spin too long if we get preempted. |
| 4412 | */ |
| 4413 | preempt_disable(); |
| 4414 | ++userpg->lock; |
| 4415 | barrier(); |
| 4416 | userpg->index = perf_event_index(event); |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 4417 | userpg->offset = perf_event_count(event); |
Peter Zijlstra | 365a403 | 2011-11-21 20:58:59 +0100 | [diff] [blame] | 4418 | if (userpg->index) |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 4419 | userpg->offset -= local64_read(&event->hw.prev_count); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4420 | |
Eric B Munson | 0d64120 | 2011-06-24 12:26:26 -0400 | [diff] [blame] | 4421 | userpg->time_enabled = enabled + |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4422 | atomic64_read(&event->child_total_time_enabled); |
| 4423 | |
Eric B Munson | 0d64120 | 2011-06-24 12:26:26 -0400 | [diff] [blame] | 4424 | userpg->time_running = running + |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4425 | atomic64_read(&event->child_total_time_running); |
| 4426 | |
Andy Lutomirski | c1317ec | 2014-10-24 15:58:11 -0700 | [diff] [blame] | 4427 | arch_perf_update_userpage(event, userpg, now); |
Peter Zijlstra | e3f3541 | 2011-11-21 11:43:53 +0100 | [diff] [blame] | 4428 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4429 | barrier(); |
| 4430 | ++userpg->lock; |
| 4431 | preempt_enable(); |
| 4432 | unlock: |
| 4433 | rcu_read_unlock(); |
| 4434 | } |
| 4435 | |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 4436 | static int perf_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| 4437 | { |
| 4438 | struct perf_event *event = vma->vm_file->private_data; |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4439 | struct ring_buffer *rb; |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 4440 | int ret = VM_FAULT_SIGBUS; |
| 4441 | |
| 4442 | if (vmf->flags & FAULT_FLAG_MKWRITE) { |
| 4443 | if (vmf->pgoff == 0) |
| 4444 | ret = 0; |
| 4445 | return ret; |
| 4446 | } |
| 4447 | |
| 4448 | rcu_read_lock(); |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4449 | rb = rcu_dereference(event->rb); |
| 4450 | if (!rb) |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 4451 | goto unlock; |
| 4452 | |
| 4453 | if (vmf->pgoff && (vmf->flags & FAULT_FLAG_WRITE)) |
| 4454 | goto unlock; |
| 4455 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4456 | vmf->page = perf_mmap_to_page(rb, vmf->pgoff); |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 4457 | if (!vmf->page) |
| 4458 | goto unlock; |
| 4459 | |
| 4460 | get_page(vmf->page); |
| 4461 | vmf->page->mapping = vma->vm_file->f_mapping; |
| 4462 | vmf->page->index = vmf->pgoff; |
| 4463 | |
| 4464 | ret = 0; |
| 4465 | unlock: |
| 4466 | rcu_read_unlock(); |
| 4467 | |
| 4468 | return ret; |
| 4469 | } |
| 4470 | |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 4471 | static void ring_buffer_attach(struct perf_event *event, |
| 4472 | struct ring_buffer *rb) |
| 4473 | { |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 4474 | struct ring_buffer *old_rb = NULL; |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 4475 | unsigned long flags; |
| 4476 | |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 4477 | if (event->rb) { |
| 4478 | /* |
| 4479 | * Should be impossible, we set this when removing |
| 4480 | * event->rb_entry and wait/clear when adding event->rb_entry. |
| 4481 | */ |
| 4482 | WARN_ON_ONCE(event->rcu_pending); |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 4483 | |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 4484 | old_rb = event->rb; |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 4485 | spin_lock_irqsave(&old_rb->event_lock, flags); |
| 4486 | list_del_rcu(&event->rb_entry); |
| 4487 | spin_unlock_irqrestore(&old_rb->event_lock, flags); |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 4488 | |
Oleg Nesterov | 2f993cf | 2015-05-30 22:04:25 +0200 | [diff] [blame] | 4489 | event->rcu_batches = get_state_synchronize_rcu(); |
| 4490 | event->rcu_pending = 1; |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 4491 | } |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 4492 | |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 4493 | if (rb) { |
Oleg Nesterov | 2f993cf | 2015-05-30 22:04:25 +0200 | [diff] [blame] | 4494 | if (event->rcu_pending) { |
| 4495 | cond_synchronize_rcu(event->rcu_batches); |
| 4496 | event->rcu_pending = 0; |
| 4497 | } |
| 4498 | |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 4499 | spin_lock_irqsave(&rb->event_lock, flags); |
| 4500 | list_add_rcu(&event->rb_entry, &rb->event_list); |
| 4501 | spin_unlock_irqrestore(&rb->event_lock, flags); |
| 4502 | } |
| 4503 | |
| 4504 | rcu_assign_pointer(event->rb, rb); |
| 4505 | |
| 4506 | if (old_rb) { |
| 4507 | ring_buffer_put(old_rb); |
| 4508 | /* |
| 4509 | * Since we detached before setting the new rb, so that we |
| 4510 | * could attach the new rb, we could have missed a wakeup. |
| 4511 | * Provide it now. |
| 4512 | */ |
| 4513 | wake_up_all(&event->waitq); |
| 4514 | } |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 4515 | } |
| 4516 | |
| 4517 | static void ring_buffer_wakeup(struct perf_event *event) |
| 4518 | { |
| 4519 | struct ring_buffer *rb; |
| 4520 | |
| 4521 | rcu_read_lock(); |
| 4522 | rb = rcu_dereference(event->rb); |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4523 | if (rb) { |
| 4524 | list_for_each_entry_rcu(event, &rb->event_list, rb_entry) |
| 4525 | wake_up_all(&event->waitq); |
| 4526 | } |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 4527 | rcu_read_unlock(); |
| 4528 | } |
| 4529 | |
Alexander Shishkin | fdc2670 | 2015-01-14 14:18:16 +0200 | [diff] [blame] | 4530 | struct ring_buffer *ring_buffer_get(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4531 | { |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4532 | struct ring_buffer *rb; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4533 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4534 | rcu_read_lock(); |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4535 | rb = rcu_dereference(event->rb); |
| 4536 | if (rb) { |
| 4537 | if (!atomic_inc_not_zero(&rb->refcount)) |
| 4538 | rb = NULL; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4539 | } |
| 4540 | rcu_read_unlock(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4541 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4542 | return rb; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4543 | } |
| 4544 | |
Alexander Shishkin | fdc2670 | 2015-01-14 14:18:16 +0200 | [diff] [blame] | 4545 | void ring_buffer_put(struct ring_buffer *rb) |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4546 | { |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4547 | if (!atomic_dec_and_test(&rb->refcount)) |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4548 | return; |
| 4549 | |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4550 | WARN_ON_ONCE(!list_empty(&rb->event_list)); |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 4551 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4552 | call_rcu(&rb->rcu_head, rb_free_rcu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4553 | } |
| 4554 | |
| 4555 | static void perf_mmap_open(struct vm_area_struct *vma) |
| 4556 | { |
| 4557 | struct perf_event *event = vma->vm_file->private_data; |
| 4558 | |
| 4559 | atomic_inc(&event->mmap_count); |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4560 | atomic_inc(&event->rb->mmap_count); |
Andy Lutomirski | 1e0fb9e | 2014-10-24 15:58:10 -0700 | [diff] [blame] | 4561 | |
Peter Zijlstra | 45bfb2e | 2015-01-14 14:18:11 +0200 | [diff] [blame] | 4562 | if (vma->vm_pgoff) |
| 4563 | atomic_inc(&event->rb->aux_mmap_count); |
| 4564 | |
Andy Lutomirski | 1e0fb9e | 2014-10-24 15:58:10 -0700 | [diff] [blame] | 4565 | if (event->pmu->event_mapped) |
| 4566 | event->pmu->event_mapped(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4567 | } |
| 4568 | |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4569 | /* |
| 4570 | * A buffer can be mmap()ed multiple times; either directly through the same |
| 4571 | * event, or through other events by use of perf_event_set_output(). |
| 4572 | * |
| 4573 | * In order to undo the VM accounting done by perf_mmap() we need to destroy |
| 4574 | * the buffer here, where we still have a VM context. This means we need |
| 4575 | * to detach all events redirecting to us. |
| 4576 | */ |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4577 | static void perf_mmap_close(struct vm_area_struct *vma) |
| 4578 | { |
| 4579 | struct perf_event *event = vma->vm_file->private_data; |
| 4580 | |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 4581 | struct ring_buffer *rb = ring_buffer_get(event); |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4582 | struct user_struct *mmap_user = rb->mmap_user; |
| 4583 | int mmap_locked = rb->mmap_locked; |
| 4584 | unsigned long size = perf_data_size(rb); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4585 | |
Andy Lutomirski | 1e0fb9e | 2014-10-24 15:58:10 -0700 | [diff] [blame] | 4586 | if (event->pmu->event_unmapped) |
| 4587 | event->pmu->event_unmapped(event); |
| 4588 | |
Peter Zijlstra | 45bfb2e | 2015-01-14 14:18:11 +0200 | [diff] [blame] | 4589 | /* |
| 4590 | * rb->aux_mmap_count will always drop before rb->mmap_count and |
| 4591 | * event->mmap_count, so it is ok to use event->mmap_mutex to |
| 4592 | * serialize with perf_mmap here. |
| 4593 | */ |
| 4594 | if (rb_has_aux(rb) && vma->vm_pgoff == rb->aux_pgoff && |
| 4595 | atomic_dec_and_mutex_lock(&rb->aux_mmap_count, &event->mmap_mutex)) { |
| 4596 | atomic_long_sub(rb->aux_nr_pages, &mmap_user->locked_vm); |
| 4597 | vma->vm_mm->pinned_vm -= rb->aux_mmap_locked; |
| 4598 | |
| 4599 | rb_free_aux(rb); |
| 4600 | mutex_unlock(&event->mmap_mutex); |
| 4601 | } |
| 4602 | |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4603 | atomic_dec(&rb->mmap_count); |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4604 | |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4605 | if (!atomic_dec_and_mutex_lock(&event->mmap_count, &event->mmap_mutex)) |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 4606 | goto out_put; |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4607 | |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 4608 | ring_buffer_attach(event, NULL); |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4609 | mutex_unlock(&event->mmap_mutex); |
| 4610 | |
| 4611 | /* If there's still other mmap()s of this buffer, we're done. */ |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 4612 | if (atomic_read(&rb->mmap_count)) |
| 4613 | goto out_put; |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4614 | |
| 4615 | /* |
| 4616 | * No other mmap()s, detach from all other events that might redirect |
| 4617 | * into the now unreachable buffer. Somewhat complicated by the |
| 4618 | * fact that rb::event_lock otherwise nests inside mmap_mutex. |
| 4619 | */ |
| 4620 | again: |
| 4621 | rcu_read_lock(); |
| 4622 | list_for_each_entry_rcu(event, &rb->event_list, rb_entry) { |
| 4623 | if (!atomic_long_inc_not_zero(&event->refcount)) { |
| 4624 | /* |
| 4625 | * This event is en-route to free_event() which will |
| 4626 | * detach it and remove it from the list. |
| 4627 | */ |
| 4628 | continue; |
| 4629 | } |
| 4630 | rcu_read_unlock(); |
| 4631 | |
| 4632 | mutex_lock(&event->mmap_mutex); |
| 4633 | /* |
| 4634 | * Check we didn't race with perf_event_set_output() which can |
| 4635 | * swizzle the rb from under us while we were waiting to |
| 4636 | * acquire mmap_mutex. |
| 4637 | * |
| 4638 | * If we find a different rb; ignore this event, a next |
| 4639 | * iteration will no longer find it on the list. We have to |
| 4640 | * still restart the iteration to make sure we're not now |
| 4641 | * iterating the wrong list. |
| 4642 | */ |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 4643 | if (event->rb == rb) |
| 4644 | ring_buffer_attach(event, NULL); |
| 4645 | |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4646 | mutex_unlock(&event->mmap_mutex); |
| 4647 | put_event(event); |
| 4648 | |
| 4649 | /* |
| 4650 | * Restart the iteration; either we're on the wrong list or |
| 4651 | * destroyed its integrity by doing a deletion. |
| 4652 | */ |
| 4653 | goto again; |
| 4654 | } |
| 4655 | rcu_read_unlock(); |
| 4656 | |
| 4657 | /* |
| 4658 | * It could be there's still a few 0-ref events on the list; they'll |
| 4659 | * get cleaned up by free_event() -- they'll also still have their |
| 4660 | * ref on the rb and will free it whenever they are done with it. |
| 4661 | * |
| 4662 | * Aside from that, this buffer is 'fully' detached and unmapped, |
| 4663 | * undo the VM accounting. |
| 4664 | */ |
| 4665 | |
| 4666 | atomic_long_sub((size >> PAGE_SHIFT) + 1, &mmap_user->locked_vm); |
| 4667 | vma->vm_mm->pinned_vm -= mmap_locked; |
| 4668 | free_uid(mmap_user); |
| 4669 | |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 4670 | out_put: |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4671 | ring_buffer_put(rb); /* could be last */ |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4672 | } |
| 4673 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 4674 | static const struct vm_operations_struct perf_mmap_vmops = { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4675 | .open = perf_mmap_open, |
Peter Zijlstra | 45bfb2e | 2015-01-14 14:18:11 +0200 | [diff] [blame] | 4676 | .close = perf_mmap_close, /* non mergable */ |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4677 | .fault = perf_mmap_fault, |
| 4678 | .page_mkwrite = perf_mmap_fault, |
| 4679 | }; |
| 4680 | |
| 4681 | static int perf_mmap(struct file *file, struct vm_area_struct *vma) |
| 4682 | { |
| 4683 | struct perf_event *event = file->private_data; |
| 4684 | unsigned long user_locked, user_lock_limit; |
| 4685 | struct user_struct *user = current_user(); |
| 4686 | unsigned long locked, lock_limit; |
Peter Zijlstra | 45bfb2e | 2015-01-14 14:18:11 +0200 | [diff] [blame] | 4687 | struct ring_buffer *rb = NULL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4688 | unsigned long vma_size; |
| 4689 | unsigned long nr_pages; |
Peter Zijlstra | 45bfb2e | 2015-01-14 14:18:11 +0200 | [diff] [blame] | 4690 | long user_extra = 0, extra = 0; |
Peter Zijlstra | d57e34f | 2010-05-28 19:41:35 +0200 | [diff] [blame] | 4691 | int ret = 0, flags = 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4692 | |
Peter Zijlstra | c792061 | 2010-05-18 10:33:24 +0200 | [diff] [blame] | 4693 | /* |
| 4694 | * Don't allow mmap() of inherited per-task counters. This would |
| 4695 | * create a performance issue due to all children writing to the |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4696 | * same rb. |
Peter Zijlstra | c792061 | 2010-05-18 10:33:24 +0200 | [diff] [blame] | 4697 | */ |
| 4698 | if (event->cpu == -1 && event->attr.inherit) |
| 4699 | return -EINVAL; |
| 4700 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4701 | if (!(vma->vm_flags & VM_SHARED)) |
| 4702 | return -EINVAL; |
| 4703 | |
| 4704 | vma_size = vma->vm_end - vma->vm_start; |
Peter Zijlstra | 45bfb2e | 2015-01-14 14:18:11 +0200 | [diff] [blame] | 4705 | |
| 4706 | if (vma->vm_pgoff == 0) { |
| 4707 | nr_pages = (vma_size / PAGE_SIZE) - 1; |
| 4708 | } else { |
| 4709 | /* |
| 4710 | * AUX area mapping: if rb->aux_nr_pages != 0, it's already |
| 4711 | * mapped, all subsequent mappings should have the same size |
| 4712 | * and offset. Must be above the normal perf buffer. |
| 4713 | */ |
| 4714 | u64 aux_offset, aux_size; |
| 4715 | |
| 4716 | if (!event->rb) |
| 4717 | return -EINVAL; |
| 4718 | |
| 4719 | nr_pages = vma_size / PAGE_SIZE; |
| 4720 | |
| 4721 | mutex_lock(&event->mmap_mutex); |
| 4722 | ret = -EINVAL; |
| 4723 | |
| 4724 | rb = event->rb; |
| 4725 | if (!rb) |
| 4726 | goto aux_unlock; |
| 4727 | |
| 4728 | aux_offset = ACCESS_ONCE(rb->user_page->aux_offset); |
| 4729 | aux_size = ACCESS_ONCE(rb->user_page->aux_size); |
| 4730 | |
| 4731 | if (aux_offset < perf_data_size(rb) + PAGE_SIZE) |
| 4732 | goto aux_unlock; |
| 4733 | |
| 4734 | if (aux_offset != vma->vm_pgoff << PAGE_SHIFT) |
| 4735 | goto aux_unlock; |
| 4736 | |
| 4737 | /* already mapped with a different offset */ |
| 4738 | if (rb_has_aux(rb) && rb->aux_pgoff != vma->vm_pgoff) |
| 4739 | goto aux_unlock; |
| 4740 | |
| 4741 | if (aux_size != vma_size || aux_size != nr_pages * PAGE_SIZE) |
| 4742 | goto aux_unlock; |
| 4743 | |
| 4744 | /* already mapped with a different size */ |
| 4745 | if (rb_has_aux(rb) && rb->aux_nr_pages != nr_pages) |
| 4746 | goto aux_unlock; |
| 4747 | |
| 4748 | if (!is_power_of_2(nr_pages)) |
| 4749 | goto aux_unlock; |
| 4750 | |
| 4751 | if (!atomic_inc_not_zero(&rb->mmap_count)) |
| 4752 | goto aux_unlock; |
| 4753 | |
| 4754 | if (rb_has_aux(rb)) { |
| 4755 | atomic_inc(&rb->aux_mmap_count); |
| 4756 | ret = 0; |
| 4757 | goto unlock; |
| 4758 | } |
| 4759 | |
| 4760 | atomic_set(&rb->aux_mmap_count, 1); |
| 4761 | user_extra = nr_pages; |
| 4762 | |
| 4763 | goto accounting; |
| 4764 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4765 | |
| 4766 | /* |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4767 | * If we have rb pages ensure they're a power-of-two number, so we |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4768 | * can do bitmasks instead of modulo. |
| 4769 | */ |
Kan Liang | 2ed1131 | 2015-03-02 02:14:26 -0500 | [diff] [blame] | 4770 | if (nr_pages != 0 && !is_power_of_2(nr_pages)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4771 | return -EINVAL; |
| 4772 | |
| 4773 | if (vma_size != PAGE_SIZE * (1 + nr_pages)) |
| 4774 | return -EINVAL; |
| 4775 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4776 | WARN_ON_ONCE(event->ctx->parent_ctx); |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4777 | again: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4778 | mutex_lock(&event->mmap_mutex); |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4779 | if (event->rb) { |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4780 | if (event->rb->nr_pages != nr_pages) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4781 | ret = -EINVAL; |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4782 | goto unlock; |
| 4783 | } |
| 4784 | |
| 4785 | if (!atomic_inc_not_zero(&event->rb->mmap_count)) { |
| 4786 | /* |
| 4787 | * Raced against perf_mmap_close() through |
| 4788 | * perf_event_set_output(). Try again, hope for better |
| 4789 | * luck. |
| 4790 | */ |
| 4791 | mutex_unlock(&event->mmap_mutex); |
| 4792 | goto again; |
| 4793 | } |
| 4794 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4795 | goto unlock; |
| 4796 | } |
| 4797 | |
| 4798 | user_extra = nr_pages + 1; |
Peter Zijlstra | 45bfb2e | 2015-01-14 14:18:11 +0200 | [diff] [blame] | 4799 | |
| 4800 | accounting: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4801 | user_lock_limit = sysctl_perf_event_mlock >> (PAGE_SHIFT - 10); |
| 4802 | |
| 4803 | /* |
| 4804 | * Increase the limit linearly with more CPUs: |
| 4805 | */ |
| 4806 | user_lock_limit *= num_online_cpus(); |
| 4807 | |
| 4808 | user_locked = atomic_long_read(&user->locked_vm) + user_extra; |
| 4809 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4810 | if (user_locked > user_lock_limit) |
| 4811 | extra = user_locked - user_lock_limit; |
| 4812 | |
Jiri Slaby | 78d7d40 | 2010-03-05 13:42:54 -0800 | [diff] [blame] | 4813 | lock_limit = rlimit(RLIMIT_MEMLOCK); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4814 | lock_limit >>= PAGE_SHIFT; |
Christoph Lameter | bc3e53f | 2011-10-31 17:07:30 -0700 | [diff] [blame] | 4815 | locked = vma->vm_mm->pinned_vm + extra; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4816 | |
| 4817 | if ((locked > lock_limit) && perf_paranoid_tracepoint_raw() && |
| 4818 | !capable(CAP_IPC_LOCK)) { |
| 4819 | ret = -EPERM; |
| 4820 | goto unlock; |
| 4821 | } |
| 4822 | |
Peter Zijlstra | 45bfb2e | 2015-01-14 14:18:11 +0200 | [diff] [blame] | 4823 | WARN_ON(!rb && event->rb); |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 4824 | |
Peter Zijlstra | d57e34f | 2010-05-28 19:41:35 +0200 | [diff] [blame] | 4825 | if (vma->vm_flags & VM_WRITE) |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4826 | flags |= RING_BUFFER_WRITABLE; |
Peter Zijlstra | d57e34f | 2010-05-28 19:41:35 +0200 | [diff] [blame] | 4827 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 4828 | if (!rb) { |
Peter Zijlstra | 45bfb2e | 2015-01-14 14:18:11 +0200 | [diff] [blame] | 4829 | rb = rb_alloc(nr_pages, |
| 4830 | event->attr.watermark ? event->attr.wakeup_watermark : 0, |
| 4831 | event->cpu, flags); |
| 4832 | |
| 4833 | if (!rb) { |
| 4834 | ret = -ENOMEM; |
| 4835 | goto unlock; |
| 4836 | } |
| 4837 | |
| 4838 | atomic_set(&rb->mmap_count, 1); |
| 4839 | rb->mmap_user = get_current_user(); |
| 4840 | rb->mmap_locked = extra; |
| 4841 | |
| 4842 | ring_buffer_attach(event, rb); |
| 4843 | |
| 4844 | perf_event_init_userpage(event); |
| 4845 | perf_event_update_userpage(event); |
| 4846 | } else { |
Alexander Shishkin | 1a59413 | 2015-01-14 14:18:18 +0200 | [diff] [blame] | 4847 | ret = rb_alloc_aux(rb, event, vma->vm_pgoff, nr_pages, |
| 4848 | event->attr.aux_watermark, flags); |
Peter Zijlstra | 45bfb2e | 2015-01-14 14:18:11 +0200 | [diff] [blame] | 4849 | if (!ret) |
| 4850 | rb->aux_mmap_locked = extra; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4851 | } |
Peter Zijlstra | 26cb63a | 2013-05-28 10:55:48 +0200 | [diff] [blame] | 4852 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4853 | unlock: |
Peter Zijlstra | 45bfb2e | 2015-01-14 14:18:11 +0200 | [diff] [blame] | 4854 | if (!ret) { |
| 4855 | atomic_long_add(user_extra, &user->locked_vm); |
| 4856 | vma->vm_mm->pinned_vm += extra; |
| 4857 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 4858 | atomic_inc(&event->mmap_count); |
Peter Zijlstra | 45bfb2e | 2015-01-14 14:18:11 +0200 | [diff] [blame] | 4859 | } else if (rb) { |
| 4860 | atomic_dec(&rb->mmap_count); |
| 4861 | } |
| 4862 | aux_unlock: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4863 | mutex_unlock(&event->mmap_mutex); |
| 4864 | |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 4865 | /* |
| 4866 | * Since pinned accounting is per vm we cannot allow fork() to copy our |
| 4867 | * vma. |
| 4868 | */ |
Peter Zijlstra | 26cb63a | 2013-05-28 10:55:48 +0200 | [diff] [blame] | 4869 | vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND | VM_DONTDUMP; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4870 | vma->vm_ops = &perf_mmap_vmops; |
| 4871 | |
Andy Lutomirski | 1e0fb9e | 2014-10-24 15:58:10 -0700 | [diff] [blame] | 4872 | if (event->pmu->event_mapped) |
| 4873 | event->pmu->event_mapped(event); |
| 4874 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4875 | return ret; |
| 4876 | } |
| 4877 | |
| 4878 | static int perf_fasync(int fd, struct file *filp, int on) |
| 4879 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 4880 | struct inode *inode = file_inode(filp); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4881 | struct perf_event *event = filp->private_data; |
| 4882 | int retval; |
| 4883 | |
| 4884 | mutex_lock(&inode->i_mutex); |
| 4885 | retval = fasync_helper(fd, filp, on, &event->fasync); |
| 4886 | mutex_unlock(&inode->i_mutex); |
| 4887 | |
| 4888 | if (retval < 0) |
| 4889 | return retval; |
| 4890 | |
| 4891 | return 0; |
| 4892 | } |
| 4893 | |
| 4894 | static const struct file_operations perf_fops = { |
Arnd Bergmann | 3326c1c | 2010-03-23 19:09:33 +0100 | [diff] [blame] | 4895 | .llseek = no_llseek, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4896 | .release = perf_release, |
| 4897 | .read = perf_read, |
| 4898 | .poll = perf_poll, |
| 4899 | .unlocked_ioctl = perf_ioctl, |
Pawel Moll | b3f2078 | 2014-06-13 16:03:32 +0100 | [diff] [blame] | 4900 | .compat_ioctl = perf_compat_ioctl, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4901 | .mmap = perf_mmap, |
| 4902 | .fasync = perf_fasync, |
| 4903 | }; |
| 4904 | |
| 4905 | /* |
| 4906 | * Perf event wakeup |
| 4907 | * |
| 4908 | * If there's data, ensure we set the poll() state and publish everything |
| 4909 | * to user-space before waking everybody up. |
| 4910 | */ |
| 4911 | |
Peter Zijlstra | fed66e2cd | 2015-06-11 10:32:01 +0200 | [diff] [blame] | 4912 | static inline struct fasync_struct **perf_event_fasync(struct perf_event *event) |
| 4913 | { |
| 4914 | /* only the parent has fasync state */ |
| 4915 | if (event->parent) |
| 4916 | event = event->parent; |
| 4917 | return &event->fasync; |
| 4918 | } |
| 4919 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4920 | void perf_event_wakeup(struct perf_event *event) |
| 4921 | { |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 4922 | ring_buffer_wakeup(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4923 | |
| 4924 | if (event->pending_kill) { |
Peter Zijlstra | fed66e2cd | 2015-06-11 10:32:01 +0200 | [diff] [blame] | 4925 | kill_fasync(perf_event_fasync(event), SIGIO, event->pending_kill); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4926 | event->pending_kill = 0; |
| 4927 | } |
| 4928 | } |
| 4929 | |
Peter Zijlstra | e360adb | 2010-10-14 14:01:34 +0800 | [diff] [blame] | 4930 | static void perf_pending_event(struct irq_work *entry) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4931 | { |
| 4932 | struct perf_event *event = container_of(entry, |
| 4933 | struct perf_event, pending); |
Peter Zijlstra | d525211 | 2015-02-19 18:03:11 +0100 | [diff] [blame] | 4934 | int rctx; |
| 4935 | |
| 4936 | rctx = perf_swevent_get_recursion_context(); |
| 4937 | /* |
| 4938 | * If we 'fail' here, that's OK, it means recursion is already disabled |
| 4939 | * and we won't recurse 'further'. |
| 4940 | */ |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4941 | |
| 4942 | if (event->pending_disable) { |
| 4943 | event->pending_disable = 0; |
| 4944 | __perf_event_disable(event); |
| 4945 | } |
| 4946 | |
| 4947 | if (event->pending_wakeup) { |
| 4948 | event->pending_wakeup = 0; |
| 4949 | perf_event_wakeup(event); |
| 4950 | } |
Peter Zijlstra | d525211 | 2015-02-19 18:03:11 +0100 | [diff] [blame] | 4951 | |
| 4952 | if (rctx >= 0) |
| 4953 | perf_swevent_put_recursion_context(rctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4954 | } |
| 4955 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4956 | /* |
Zhang, Yanmin | 39447b3 | 2010-04-19 13:32:41 +0800 | [diff] [blame] | 4957 | * We assume there is only KVM supporting the callbacks. |
| 4958 | * Later on, we might change it to a list if there is |
| 4959 | * another virtualization implementation supporting the callbacks. |
| 4960 | */ |
| 4961 | struct perf_guest_info_callbacks *perf_guest_cbs; |
| 4962 | |
| 4963 | int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) |
| 4964 | { |
| 4965 | perf_guest_cbs = cbs; |
| 4966 | return 0; |
| 4967 | } |
| 4968 | EXPORT_SYMBOL_GPL(perf_register_guest_info_callbacks); |
| 4969 | |
| 4970 | int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) |
| 4971 | { |
| 4972 | perf_guest_cbs = NULL; |
| 4973 | return 0; |
| 4974 | } |
| 4975 | EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks); |
| 4976 | |
Jiri Olsa | 4018994 | 2012-08-07 15:20:37 +0200 | [diff] [blame] | 4977 | static void |
| 4978 | perf_output_sample_regs(struct perf_output_handle *handle, |
| 4979 | struct pt_regs *regs, u64 mask) |
| 4980 | { |
| 4981 | int bit; |
| 4982 | |
| 4983 | for_each_set_bit(bit, (const unsigned long *) &mask, |
| 4984 | sizeof(mask) * BITS_PER_BYTE) { |
| 4985 | u64 val; |
| 4986 | |
| 4987 | val = perf_reg_value(regs, bit); |
| 4988 | perf_output_put(handle, val); |
| 4989 | } |
| 4990 | } |
| 4991 | |
Stephane Eranian | 60e2364 | 2014-09-24 13:48:37 +0200 | [diff] [blame] | 4992 | static void perf_sample_regs_user(struct perf_regs *regs_user, |
Andy Lutomirski | 88a7c26 | 2015-01-04 10:36:19 -0800 | [diff] [blame] | 4993 | struct pt_regs *regs, |
| 4994 | struct pt_regs *regs_user_copy) |
Jiri Olsa | 4018994 | 2012-08-07 15:20:37 +0200 | [diff] [blame] | 4995 | { |
Andy Lutomirski | 88a7c26 | 2015-01-04 10:36:19 -0800 | [diff] [blame] | 4996 | if (user_mode(regs)) { |
| 4997 | regs_user->abi = perf_reg_abi(current); |
Peter Zijlstra | 2565711 | 2014-09-24 13:48:42 +0200 | [diff] [blame] | 4998 | regs_user->regs = regs; |
Andy Lutomirski | 88a7c26 | 2015-01-04 10:36:19 -0800 | [diff] [blame] | 4999 | } else if (current->mm) { |
| 5000 | perf_get_regs_user(regs_user, regs, regs_user_copy); |
Peter Zijlstra | 2565711 | 2014-09-24 13:48:42 +0200 | [diff] [blame] | 5001 | } else { |
| 5002 | regs_user->abi = PERF_SAMPLE_REGS_ABI_NONE; |
| 5003 | regs_user->regs = NULL; |
Jiri Olsa | 4018994 | 2012-08-07 15:20:37 +0200 | [diff] [blame] | 5004 | } |
| 5005 | } |
| 5006 | |
Stephane Eranian | 60e2364 | 2014-09-24 13:48:37 +0200 | [diff] [blame] | 5007 | static void perf_sample_regs_intr(struct perf_regs *regs_intr, |
| 5008 | struct pt_regs *regs) |
| 5009 | { |
| 5010 | regs_intr->regs = regs; |
| 5011 | regs_intr->abi = perf_reg_abi(current); |
| 5012 | } |
| 5013 | |
| 5014 | |
Jiri Olsa | c5ebced | 2012-08-07 15:20:40 +0200 | [diff] [blame] | 5015 | /* |
| 5016 | * Get remaining task size from user stack pointer. |
| 5017 | * |
| 5018 | * It'd be better to take stack vma map and limit this more |
| 5019 | * precisly, but there's no way to get it safely under interrupt, |
| 5020 | * so using TASK_SIZE as limit. |
| 5021 | */ |
| 5022 | static u64 perf_ustack_task_size(struct pt_regs *regs) |
| 5023 | { |
| 5024 | unsigned long addr = perf_user_stack_pointer(regs); |
| 5025 | |
| 5026 | if (!addr || addr >= TASK_SIZE) |
| 5027 | return 0; |
| 5028 | |
| 5029 | return TASK_SIZE - addr; |
| 5030 | } |
| 5031 | |
| 5032 | static u16 |
| 5033 | perf_sample_ustack_size(u16 stack_size, u16 header_size, |
| 5034 | struct pt_regs *regs) |
| 5035 | { |
| 5036 | u64 task_size; |
| 5037 | |
| 5038 | /* No regs, no stack pointer, no dump. */ |
| 5039 | if (!regs) |
| 5040 | return 0; |
| 5041 | |
| 5042 | /* |
| 5043 | * Check if we fit in with the requested stack size into the: |
| 5044 | * - TASK_SIZE |
| 5045 | * If we don't, we limit the size to the TASK_SIZE. |
| 5046 | * |
| 5047 | * - remaining sample size |
| 5048 | * If we don't, we customize the stack size to |
| 5049 | * fit in to the remaining sample size. |
| 5050 | */ |
| 5051 | |
| 5052 | task_size = min((u64) USHRT_MAX, perf_ustack_task_size(regs)); |
| 5053 | stack_size = min(stack_size, (u16) task_size); |
| 5054 | |
| 5055 | /* Current header size plus static size and dynamic size. */ |
| 5056 | header_size += 2 * sizeof(u64); |
| 5057 | |
| 5058 | /* Do we fit in with the current stack dump size? */ |
| 5059 | if ((u16) (header_size + stack_size) < header_size) { |
| 5060 | /* |
| 5061 | * If we overflow the maximum size for the sample, |
| 5062 | * we customize the stack dump size to fit in. |
| 5063 | */ |
| 5064 | stack_size = USHRT_MAX - header_size - sizeof(u64); |
| 5065 | stack_size = round_up(stack_size, sizeof(u64)); |
| 5066 | } |
| 5067 | |
| 5068 | return stack_size; |
| 5069 | } |
| 5070 | |
| 5071 | static void |
| 5072 | perf_output_sample_ustack(struct perf_output_handle *handle, u64 dump_size, |
| 5073 | struct pt_regs *regs) |
| 5074 | { |
| 5075 | /* Case of a kernel thread, nothing to dump */ |
| 5076 | if (!regs) { |
| 5077 | u64 size = 0; |
| 5078 | perf_output_put(handle, size); |
| 5079 | } else { |
| 5080 | unsigned long sp; |
| 5081 | unsigned int rem; |
| 5082 | u64 dyn_size; |
| 5083 | |
| 5084 | /* |
| 5085 | * We dump: |
| 5086 | * static size |
| 5087 | * - the size requested by user or the best one we can fit |
| 5088 | * in to the sample max size |
| 5089 | * data |
| 5090 | * - user stack dump data |
| 5091 | * dynamic size |
| 5092 | * - the actual dumped size |
| 5093 | */ |
| 5094 | |
| 5095 | /* Static size. */ |
| 5096 | perf_output_put(handle, dump_size); |
| 5097 | |
| 5098 | /* Data. */ |
| 5099 | sp = perf_user_stack_pointer(regs); |
| 5100 | rem = __output_copy_user(handle, (void *) sp, dump_size); |
| 5101 | dyn_size = dump_size - rem; |
| 5102 | |
| 5103 | perf_output_skip(handle, rem); |
| 5104 | |
| 5105 | /* Dynamic size. */ |
| 5106 | perf_output_put(handle, dyn_size); |
| 5107 | } |
| 5108 | } |
| 5109 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5110 | static void __perf_event_header__init_id(struct perf_event_header *header, |
| 5111 | struct perf_sample_data *data, |
| 5112 | struct perf_event *event) |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 5113 | { |
| 5114 | u64 sample_type = event->attr.sample_type; |
| 5115 | |
| 5116 | data->type = sample_type; |
| 5117 | header->size += event->id_header_size; |
| 5118 | |
| 5119 | if (sample_type & PERF_SAMPLE_TID) { |
| 5120 | /* namespace issues */ |
| 5121 | data->tid_entry.pid = perf_event_pid(event, current); |
| 5122 | data->tid_entry.tid = perf_event_tid(event, current); |
| 5123 | } |
| 5124 | |
| 5125 | if (sample_type & PERF_SAMPLE_TIME) |
Peter Zijlstra | 34f4392 | 2015-02-20 14:05:38 +0100 | [diff] [blame] | 5126 | data->time = perf_event_clock(event); |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 5127 | |
Adrian Hunter | ff3d527 | 2013-08-27 11:23:07 +0300 | [diff] [blame] | 5128 | if (sample_type & (PERF_SAMPLE_ID | PERF_SAMPLE_IDENTIFIER)) |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 5129 | data->id = primary_event_id(event); |
| 5130 | |
| 5131 | if (sample_type & PERF_SAMPLE_STREAM_ID) |
| 5132 | data->stream_id = event->id; |
| 5133 | |
| 5134 | if (sample_type & PERF_SAMPLE_CPU) { |
| 5135 | data->cpu_entry.cpu = raw_smp_processor_id(); |
| 5136 | data->cpu_entry.reserved = 0; |
| 5137 | } |
| 5138 | } |
| 5139 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 5140 | void perf_event_header__init_id(struct perf_event_header *header, |
| 5141 | struct perf_sample_data *data, |
| 5142 | struct perf_event *event) |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5143 | { |
| 5144 | if (event->attr.sample_id_all) |
| 5145 | __perf_event_header__init_id(header, data, event); |
| 5146 | } |
| 5147 | |
| 5148 | static void __perf_event__output_id_sample(struct perf_output_handle *handle, |
| 5149 | struct perf_sample_data *data) |
| 5150 | { |
| 5151 | u64 sample_type = data->type; |
| 5152 | |
| 5153 | if (sample_type & PERF_SAMPLE_TID) |
| 5154 | perf_output_put(handle, data->tid_entry); |
| 5155 | |
| 5156 | if (sample_type & PERF_SAMPLE_TIME) |
| 5157 | perf_output_put(handle, data->time); |
| 5158 | |
| 5159 | if (sample_type & PERF_SAMPLE_ID) |
| 5160 | perf_output_put(handle, data->id); |
| 5161 | |
| 5162 | if (sample_type & PERF_SAMPLE_STREAM_ID) |
| 5163 | perf_output_put(handle, data->stream_id); |
| 5164 | |
| 5165 | if (sample_type & PERF_SAMPLE_CPU) |
| 5166 | perf_output_put(handle, data->cpu_entry); |
Adrian Hunter | ff3d527 | 2013-08-27 11:23:07 +0300 | [diff] [blame] | 5167 | |
| 5168 | if (sample_type & PERF_SAMPLE_IDENTIFIER) |
| 5169 | perf_output_put(handle, data->id); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5170 | } |
| 5171 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 5172 | void perf_event__output_id_sample(struct perf_event *event, |
| 5173 | struct perf_output_handle *handle, |
| 5174 | struct perf_sample_data *sample) |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5175 | { |
| 5176 | if (event->attr.sample_id_all) |
| 5177 | __perf_event__output_id_sample(handle, sample); |
| 5178 | } |
| 5179 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5180 | static void perf_output_read_one(struct perf_output_handle *handle, |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 5181 | struct perf_event *event, |
| 5182 | u64 enabled, u64 running) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5183 | { |
| 5184 | u64 read_format = event->attr.read_format; |
| 5185 | u64 values[4]; |
| 5186 | int n = 0; |
| 5187 | |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 5188 | values[n++] = perf_event_count(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5189 | if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 5190 | values[n++] = enabled + |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5191 | atomic64_read(&event->child_total_time_enabled); |
| 5192 | } |
| 5193 | if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 5194 | values[n++] = running + |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5195 | atomic64_read(&event->child_total_time_running); |
| 5196 | } |
| 5197 | if (read_format & PERF_FORMAT_ID) |
| 5198 | values[n++] = primary_event_id(event); |
| 5199 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 5200 | __output_copy(handle, values, n * sizeof(u64)); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5201 | } |
| 5202 | |
| 5203 | /* |
| 5204 | * XXX PERF_FORMAT_GROUP vs inherited events seems difficult. |
| 5205 | */ |
| 5206 | static void perf_output_read_group(struct perf_output_handle *handle, |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 5207 | struct perf_event *event, |
| 5208 | u64 enabled, u64 running) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5209 | { |
| 5210 | struct perf_event *leader = event->group_leader, *sub; |
| 5211 | u64 read_format = event->attr.read_format; |
| 5212 | u64 values[5]; |
| 5213 | int n = 0; |
| 5214 | |
| 5215 | values[n++] = 1 + leader->nr_siblings; |
| 5216 | |
| 5217 | if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 5218 | values[n++] = enabled; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5219 | |
| 5220 | if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 5221 | values[n++] = running; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5222 | |
| 5223 | if (leader != event) |
| 5224 | leader->pmu->read(leader); |
| 5225 | |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 5226 | values[n++] = perf_event_count(leader); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5227 | if (read_format & PERF_FORMAT_ID) |
| 5228 | values[n++] = primary_event_id(leader); |
| 5229 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 5230 | __output_copy(handle, values, n * sizeof(u64)); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5231 | |
| 5232 | list_for_each_entry(sub, &leader->sibling_list, group_entry) { |
| 5233 | n = 0; |
| 5234 | |
Jiri Olsa | 6f5ab00 | 2012-10-15 20:13:45 +0200 | [diff] [blame] | 5235 | if ((sub != event) && |
| 5236 | (sub->state == PERF_EVENT_STATE_ACTIVE)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5237 | sub->pmu->read(sub); |
| 5238 | |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 5239 | values[n++] = perf_event_count(sub); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5240 | if (read_format & PERF_FORMAT_ID) |
| 5241 | values[n++] = primary_event_id(sub); |
| 5242 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 5243 | __output_copy(handle, values, n * sizeof(u64)); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5244 | } |
| 5245 | } |
| 5246 | |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 5247 | #define PERF_FORMAT_TOTAL_TIMES (PERF_FORMAT_TOTAL_TIME_ENABLED|\ |
| 5248 | PERF_FORMAT_TOTAL_TIME_RUNNING) |
| 5249 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5250 | static void perf_output_read(struct perf_output_handle *handle, |
| 5251 | struct perf_event *event) |
| 5252 | { |
Peter Zijlstra | e3f3541 | 2011-11-21 11:43:53 +0100 | [diff] [blame] | 5253 | u64 enabled = 0, running = 0, now; |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 5254 | u64 read_format = event->attr.read_format; |
| 5255 | |
| 5256 | /* |
| 5257 | * compute total_time_enabled, total_time_running |
| 5258 | * based on snapshot values taken when the event |
| 5259 | * was last scheduled in. |
| 5260 | * |
| 5261 | * we cannot simply called update_context_time() |
| 5262 | * because of locking issue as we are called in |
| 5263 | * NMI context |
| 5264 | */ |
Eric B Munson | c479429 | 2011-06-23 16:34:38 -0400 | [diff] [blame] | 5265 | if (read_format & PERF_FORMAT_TOTAL_TIMES) |
Peter Zijlstra | e3f3541 | 2011-11-21 11:43:53 +0100 | [diff] [blame] | 5266 | calc_timer_values(event, &now, &enabled, &running); |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 5267 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5268 | if (event->attr.read_format & PERF_FORMAT_GROUP) |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 5269 | perf_output_read_group(handle, event, enabled, running); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5270 | else |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 5271 | perf_output_read_one(handle, event, enabled, running); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5272 | } |
| 5273 | |
| 5274 | void perf_output_sample(struct perf_output_handle *handle, |
| 5275 | struct perf_event_header *header, |
| 5276 | struct perf_sample_data *data, |
| 5277 | struct perf_event *event) |
| 5278 | { |
| 5279 | u64 sample_type = data->type; |
| 5280 | |
| 5281 | perf_output_put(handle, *header); |
| 5282 | |
Adrian Hunter | ff3d527 | 2013-08-27 11:23:07 +0300 | [diff] [blame] | 5283 | if (sample_type & PERF_SAMPLE_IDENTIFIER) |
| 5284 | perf_output_put(handle, data->id); |
| 5285 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5286 | if (sample_type & PERF_SAMPLE_IP) |
| 5287 | perf_output_put(handle, data->ip); |
| 5288 | |
| 5289 | if (sample_type & PERF_SAMPLE_TID) |
| 5290 | perf_output_put(handle, data->tid_entry); |
| 5291 | |
| 5292 | if (sample_type & PERF_SAMPLE_TIME) |
| 5293 | perf_output_put(handle, data->time); |
| 5294 | |
| 5295 | if (sample_type & PERF_SAMPLE_ADDR) |
| 5296 | perf_output_put(handle, data->addr); |
| 5297 | |
| 5298 | if (sample_type & PERF_SAMPLE_ID) |
| 5299 | perf_output_put(handle, data->id); |
| 5300 | |
| 5301 | if (sample_type & PERF_SAMPLE_STREAM_ID) |
| 5302 | perf_output_put(handle, data->stream_id); |
| 5303 | |
| 5304 | if (sample_type & PERF_SAMPLE_CPU) |
| 5305 | perf_output_put(handle, data->cpu_entry); |
| 5306 | |
| 5307 | if (sample_type & PERF_SAMPLE_PERIOD) |
| 5308 | perf_output_put(handle, data->period); |
| 5309 | |
| 5310 | if (sample_type & PERF_SAMPLE_READ) |
| 5311 | perf_output_read(handle, event); |
| 5312 | |
| 5313 | if (sample_type & PERF_SAMPLE_CALLCHAIN) { |
| 5314 | if (data->callchain) { |
| 5315 | int size = 1; |
| 5316 | |
| 5317 | if (data->callchain) |
| 5318 | size += data->callchain->nr; |
| 5319 | |
| 5320 | size *= sizeof(u64); |
| 5321 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 5322 | __output_copy(handle, data->callchain, size); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5323 | } else { |
| 5324 | u64 nr = 0; |
| 5325 | perf_output_put(handle, nr); |
| 5326 | } |
| 5327 | } |
| 5328 | |
| 5329 | if (sample_type & PERF_SAMPLE_RAW) { |
| 5330 | if (data->raw) { |
Alexei Starovoitov | fa128e6 | 2015-10-20 20:02:33 -0700 | [diff] [blame] | 5331 | u32 raw_size = data->raw->size; |
| 5332 | u32 real_size = round_up(raw_size + sizeof(u32), |
| 5333 | sizeof(u64)) - sizeof(u32); |
| 5334 | u64 zero = 0; |
| 5335 | |
| 5336 | perf_output_put(handle, real_size); |
| 5337 | __output_copy(handle, data->raw->data, raw_size); |
| 5338 | if (real_size - raw_size) |
| 5339 | __output_copy(handle, &zero, real_size - raw_size); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5340 | } else { |
| 5341 | struct { |
| 5342 | u32 size; |
| 5343 | u32 data; |
| 5344 | } raw = { |
| 5345 | .size = sizeof(u32), |
| 5346 | .data = 0, |
| 5347 | }; |
| 5348 | perf_output_put(handle, raw); |
| 5349 | } |
| 5350 | } |
Peter Zijlstra | a7ac67e | 2011-06-27 16:47:16 +0200 | [diff] [blame] | 5351 | |
Stephane Eranian | bce38cd | 2012-02-09 23:20:51 +0100 | [diff] [blame] | 5352 | if (sample_type & PERF_SAMPLE_BRANCH_STACK) { |
| 5353 | if (data->br_stack) { |
| 5354 | size_t size; |
| 5355 | |
| 5356 | size = data->br_stack->nr |
| 5357 | * sizeof(struct perf_branch_entry); |
| 5358 | |
| 5359 | perf_output_put(handle, data->br_stack->nr); |
| 5360 | perf_output_copy(handle, data->br_stack->entries, size); |
| 5361 | } else { |
| 5362 | /* |
| 5363 | * we always store at least the value of nr |
| 5364 | */ |
| 5365 | u64 nr = 0; |
| 5366 | perf_output_put(handle, nr); |
| 5367 | } |
| 5368 | } |
Jiri Olsa | 4018994 | 2012-08-07 15:20:37 +0200 | [diff] [blame] | 5369 | |
| 5370 | if (sample_type & PERF_SAMPLE_REGS_USER) { |
| 5371 | u64 abi = data->regs_user.abi; |
| 5372 | |
| 5373 | /* |
| 5374 | * If there are no regs to dump, notice it through |
| 5375 | * first u64 being zero (PERF_SAMPLE_REGS_ABI_NONE). |
| 5376 | */ |
| 5377 | perf_output_put(handle, abi); |
| 5378 | |
| 5379 | if (abi) { |
| 5380 | u64 mask = event->attr.sample_regs_user; |
| 5381 | perf_output_sample_regs(handle, |
| 5382 | data->regs_user.regs, |
| 5383 | mask); |
| 5384 | } |
| 5385 | } |
Jiri Olsa | c5ebced | 2012-08-07 15:20:40 +0200 | [diff] [blame] | 5386 | |
Peter Zijlstra | a5cdd40 | 2013-07-16 17:09:07 +0200 | [diff] [blame] | 5387 | if (sample_type & PERF_SAMPLE_STACK_USER) { |
Jiri Olsa | c5ebced | 2012-08-07 15:20:40 +0200 | [diff] [blame] | 5388 | perf_output_sample_ustack(handle, |
| 5389 | data->stack_user_size, |
| 5390 | data->regs_user.regs); |
Peter Zijlstra | a5cdd40 | 2013-07-16 17:09:07 +0200 | [diff] [blame] | 5391 | } |
Andi Kleen | c3feedf | 2013-01-24 16:10:28 +0100 | [diff] [blame] | 5392 | |
| 5393 | if (sample_type & PERF_SAMPLE_WEIGHT) |
| 5394 | perf_output_put(handle, data->weight); |
Stephane Eranian | d6be9ad | 2013-01-24 16:10:31 +0100 | [diff] [blame] | 5395 | |
| 5396 | if (sample_type & PERF_SAMPLE_DATA_SRC) |
| 5397 | perf_output_put(handle, data->data_src.val); |
Peter Zijlstra | a5cdd40 | 2013-07-16 17:09:07 +0200 | [diff] [blame] | 5398 | |
Andi Kleen | fdfbbd0 | 2013-09-20 07:40:39 -0700 | [diff] [blame] | 5399 | if (sample_type & PERF_SAMPLE_TRANSACTION) |
| 5400 | perf_output_put(handle, data->txn); |
| 5401 | |
Stephane Eranian | 60e2364 | 2014-09-24 13:48:37 +0200 | [diff] [blame] | 5402 | if (sample_type & PERF_SAMPLE_REGS_INTR) { |
| 5403 | u64 abi = data->regs_intr.abi; |
| 5404 | /* |
| 5405 | * If there are no regs to dump, notice it through |
| 5406 | * first u64 being zero (PERF_SAMPLE_REGS_ABI_NONE). |
| 5407 | */ |
| 5408 | perf_output_put(handle, abi); |
| 5409 | |
| 5410 | if (abi) { |
| 5411 | u64 mask = event->attr.sample_regs_intr; |
| 5412 | |
| 5413 | perf_output_sample_regs(handle, |
| 5414 | data->regs_intr.regs, |
| 5415 | mask); |
| 5416 | } |
| 5417 | } |
| 5418 | |
Peter Zijlstra | a5cdd40 | 2013-07-16 17:09:07 +0200 | [diff] [blame] | 5419 | if (!event->attr.watermark) { |
| 5420 | int wakeup_events = event->attr.wakeup_events; |
| 5421 | |
| 5422 | if (wakeup_events) { |
| 5423 | struct ring_buffer *rb = handle->rb; |
| 5424 | int events = local_inc_return(&rb->events); |
| 5425 | |
| 5426 | if (events >= wakeup_events) { |
| 5427 | local_sub(wakeup_events, &rb->events); |
| 5428 | local_inc(&rb->wakeup); |
| 5429 | } |
| 5430 | } |
| 5431 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5432 | } |
| 5433 | |
| 5434 | void perf_prepare_sample(struct perf_event_header *header, |
| 5435 | struct perf_sample_data *data, |
| 5436 | struct perf_event *event, |
| 5437 | struct pt_regs *regs) |
| 5438 | { |
| 5439 | u64 sample_type = event->attr.sample_type; |
| 5440 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5441 | header->type = PERF_RECORD_SAMPLE; |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 5442 | header->size = sizeof(*header) + event->header_size; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5443 | |
| 5444 | header->misc = 0; |
| 5445 | header->misc |= perf_misc_flags(regs); |
| 5446 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5447 | __perf_event_header__init_id(header, data, event); |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 5448 | |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 5449 | if (sample_type & PERF_SAMPLE_IP) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5450 | data->ip = perf_instruction_pointer(regs); |
| 5451 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5452 | if (sample_type & PERF_SAMPLE_CALLCHAIN) { |
| 5453 | int size = 1; |
| 5454 | |
Andrew Vagin | e6dab5f | 2012-07-11 18:14:58 +0400 | [diff] [blame] | 5455 | data->callchain = perf_callchain(event, regs); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5456 | |
| 5457 | if (data->callchain) |
| 5458 | size += data->callchain->nr; |
| 5459 | |
| 5460 | header->size += size * sizeof(u64); |
| 5461 | } |
| 5462 | |
| 5463 | if (sample_type & PERF_SAMPLE_RAW) { |
| 5464 | int size = sizeof(u32); |
| 5465 | |
| 5466 | if (data->raw) |
| 5467 | size += data->raw->size; |
| 5468 | else |
| 5469 | size += sizeof(u32); |
| 5470 | |
Alexei Starovoitov | fa128e6 | 2015-10-20 20:02:33 -0700 | [diff] [blame] | 5471 | header->size += round_up(size, sizeof(u64)); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5472 | } |
Stephane Eranian | bce38cd | 2012-02-09 23:20:51 +0100 | [diff] [blame] | 5473 | |
| 5474 | if (sample_type & PERF_SAMPLE_BRANCH_STACK) { |
| 5475 | int size = sizeof(u64); /* nr */ |
| 5476 | if (data->br_stack) { |
| 5477 | size += data->br_stack->nr |
| 5478 | * sizeof(struct perf_branch_entry); |
| 5479 | } |
| 5480 | header->size += size; |
| 5481 | } |
Jiri Olsa | 4018994 | 2012-08-07 15:20:37 +0200 | [diff] [blame] | 5482 | |
Peter Zijlstra | 2565711 | 2014-09-24 13:48:42 +0200 | [diff] [blame] | 5483 | if (sample_type & (PERF_SAMPLE_REGS_USER | PERF_SAMPLE_STACK_USER)) |
Andy Lutomirski | 88a7c26 | 2015-01-04 10:36:19 -0800 | [diff] [blame] | 5484 | perf_sample_regs_user(&data->regs_user, regs, |
| 5485 | &data->regs_user_copy); |
Peter Zijlstra | 2565711 | 2014-09-24 13:48:42 +0200 | [diff] [blame] | 5486 | |
Jiri Olsa | 4018994 | 2012-08-07 15:20:37 +0200 | [diff] [blame] | 5487 | if (sample_type & PERF_SAMPLE_REGS_USER) { |
| 5488 | /* regs dump ABI info */ |
| 5489 | int size = sizeof(u64); |
| 5490 | |
Jiri Olsa | 4018994 | 2012-08-07 15:20:37 +0200 | [diff] [blame] | 5491 | if (data->regs_user.regs) { |
| 5492 | u64 mask = event->attr.sample_regs_user; |
| 5493 | size += hweight64(mask) * sizeof(u64); |
| 5494 | } |
| 5495 | |
| 5496 | header->size += size; |
| 5497 | } |
Jiri Olsa | c5ebced | 2012-08-07 15:20:40 +0200 | [diff] [blame] | 5498 | |
| 5499 | if (sample_type & PERF_SAMPLE_STACK_USER) { |
| 5500 | /* |
| 5501 | * Either we need PERF_SAMPLE_STACK_USER bit to be allways |
| 5502 | * processed as the last one or have additional check added |
| 5503 | * in case new sample type is added, because we could eat |
| 5504 | * up the rest of the sample size. |
| 5505 | */ |
Jiri Olsa | c5ebced | 2012-08-07 15:20:40 +0200 | [diff] [blame] | 5506 | u16 stack_size = event->attr.sample_stack_user; |
| 5507 | u16 size = sizeof(u64); |
| 5508 | |
Jiri Olsa | c5ebced | 2012-08-07 15:20:40 +0200 | [diff] [blame] | 5509 | stack_size = perf_sample_ustack_size(stack_size, header->size, |
Peter Zijlstra | 2565711 | 2014-09-24 13:48:42 +0200 | [diff] [blame] | 5510 | data->regs_user.regs); |
Jiri Olsa | c5ebced | 2012-08-07 15:20:40 +0200 | [diff] [blame] | 5511 | |
| 5512 | /* |
| 5513 | * If there is something to dump, add space for the dump |
| 5514 | * itself and for the field that tells the dynamic size, |
| 5515 | * which is how many have been actually dumped. |
| 5516 | */ |
| 5517 | if (stack_size) |
| 5518 | size += sizeof(u64) + stack_size; |
| 5519 | |
| 5520 | data->stack_user_size = stack_size; |
| 5521 | header->size += size; |
| 5522 | } |
Stephane Eranian | 60e2364 | 2014-09-24 13:48:37 +0200 | [diff] [blame] | 5523 | |
| 5524 | if (sample_type & PERF_SAMPLE_REGS_INTR) { |
| 5525 | /* regs dump ABI info */ |
| 5526 | int size = sizeof(u64); |
| 5527 | |
| 5528 | perf_sample_regs_intr(&data->regs_intr, regs); |
| 5529 | |
| 5530 | if (data->regs_intr.regs) { |
| 5531 | u64 mask = event->attr.sample_regs_intr; |
| 5532 | |
| 5533 | size += hweight64(mask) * sizeof(u64); |
| 5534 | } |
| 5535 | |
| 5536 | header->size += size; |
| 5537 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5538 | } |
| 5539 | |
Yan, Zheng | 2150908 | 2015-05-06 15:33:49 -0400 | [diff] [blame] | 5540 | void perf_event_output(struct perf_event *event, |
| 5541 | struct perf_sample_data *data, |
| 5542 | struct pt_regs *regs) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5543 | { |
| 5544 | struct perf_output_handle handle; |
| 5545 | struct perf_event_header header; |
| 5546 | |
Frederic Weisbecker | 927c7a9 | 2010-07-01 16:20:36 +0200 | [diff] [blame] | 5547 | /* protect the callchain buffers */ |
| 5548 | rcu_read_lock(); |
| 5549 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5550 | perf_prepare_sample(&header, data, event, regs); |
| 5551 | |
Peter Zijlstra | a7ac67e | 2011-06-27 16:47:16 +0200 | [diff] [blame] | 5552 | if (perf_output_begin(&handle, event, header.size)) |
Frederic Weisbecker | 927c7a9 | 2010-07-01 16:20:36 +0200 | [diff] [blame] | 5553 | goto exit; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5554 | |
| 5555 | perf_output_sample(&handle, &header, data, event); |
| 5556 | |
| 5557 | perf_output_end(&handle); |
Frederic Weisbecker | 927c7a9 | 2010-07-01 16:20:36 +0200 | [diff] [blame] | 5558 | |
| 5559 | exit: |
| 5560 | rcu_read_unlock(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5561 | } |
| 5562 | |
| 5563 | /* |
| 5564 | * read event_id |
| 5565 | */ |
| 5566 | |
| 5567 | struct perf_read_event { |
| 5568 | struct perf_event_header header; |
| 5569 | |
| 5570 | u32 pid; |
| 5571 | u32 tid; |
| 5572 | }; |
| 5573 | |
| 5574 | static void |
| 5575 | perf_event_read_event(struct perf_event *event, |
| 5576 | struct task_struct *task) |
| 5577 | { |
| 5578 | struct perf_output_handle handle; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5579 | struct perf_sample_data sample; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5580 | struct perf_read_event read_event = { |
| 5581 | .header = { |
| 5582 | .type = PERF_RECORD_READ, |
| 5583 | .misc = 0, |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 5584 | .size = sizeof(read_event) + event->read_size, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5585 | }, |
| 5586 | .pid = perf_event_pid(event, task), |
| 5587 | .tid = perf_event_tid(event, task), |
| 5588 | }; |
| 5589 | int ret; |
| 5590 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5591 | perf_event_header__init_id(&read_event.header, &sample, event); |
Peter Zijlstra | a7ac67e | 2011-06-27 16:47:16 +0200 | [diff] [blame] | 5592 | ret = perf_output_begin(&handle, event, read_event.header.size); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5593 | if (ret) |
| 5594 | return; |
| 5595 | |
| 5596 | perf_output_put(&handle, read_event); |
| 5597 | perf_output_read(&handle, event); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5598 | perf_event__output_id_sample(event, &handle, &sample); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5599 | |
| 5600 | perf_output_end(&handle); |
| 5601 | } |
| 5602 | |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5603 | typedef void (perf_event_aux_output_cb)(struct perf_event *event, void *data); |
| 5604 | |
| 5605 | static void |
| 5606 | perf_event_aux_ctx(struct perf_event_context *ctx, |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5607 | perf_event_aux_output_cb output, |
| 5608 | void *data) |
| 5609 | { |
| 5610 | struct perf_event *event; |
| 5611 | |
| 5612 | list_for_each_entry_rcu(event, &ctx->event_list, event_entry) { |
| 5613 | if (event->state < PERF_EVENT_STATE_INACTIVE) |
| 5614 | continue; |
| 5615 | if (!event_filter_match(event)) |
| 5616 | continue; |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 5617 | output(event, data); |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5618 | } |
| 5619 | } |
| 5620 | |
| 5621 | static void |
Jiri Olsa | 4e93ad6 | 2015-11-04 16:00:05 +0100 | [diff] [blame] | 5622 | perf_event_aux_task_ctx(perf_event_aux_output_cb output, void *data, |
| 5623 | struct perf_event_context *task_ctx) |
| 5624 | { |
| 5625 | rcu_read_lock(); |
| 5626 | preempt_disable(); |
| 5627 | perf_event_aux_ctx(task_ctx, output, data); |
| 5628 | preempt_enable(); |
| 5629 | rcu_read_unlock(); |
| 5630 | } |
| 5631 | |
| 5632 | static void |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 5633 | perf_event_aux(perf_event_aux_output_cb output, void *data, |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5634 | struct perf_event_context *task_ctx) |
| 5635 | { |
| 5636 | struct perf_cpu_context *cpuctx; |
| 5637 | struct perf_event_context *ctx; |
| 5638 | struct pmu *pmu; |
| 5639 | int ctxn; |
| 5640 | |
Jiri Olsa | 4e93ad6 | 2015-11-04 16:00:05 +0100 | [diff] [blame] | 5641 | /* |
| 5642 | * If we have task_ctx != NULL we only notify |
| 5643 | * the task context itself. The task_ctx is set |
| 5644 | * only for EXIT events before releasing task |
| 5645 | * context. |
| 5646 | */ |
| 5647 | if (task_ctx) { |
| 5648 | perf_event_aux_task_ctx(output, data, task_ctx); |
| 5649 | return; |
| 5650 | } |
| 5651 | |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5652 | rcu_read_lock(); |
| 5653 | list_for_each_entry_rcu(pmu, &pmus, entry) { |
| 5654 | cpuctx = get_cpu_ptr(pmu->pmu_cpu_context); |
| 5655 | if (cpuctx->unique_pmu != pmu) |
| 5656 | goto next; |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 5657 | perf_event_aux_ctx(&cpuctx->ctx, output, data); |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5658 | ctxn = pmu->task_ctx_nr; |
| 5659 | if (ctxn < 0) |
| 5660 | goto next; |
| 5661 | ctx = rcu_dereference(current->perf_event_ctxp[ctxn]); |
| 5662 | if (ctx) |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 5663 | perf_event_aux_ctx(ctx, output, data); |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5664 | next: |
| 5665 | put_cpu_ptr(pmu->pmu_cpu_context); |
| 5666 | } |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5667 | rcu_read_unlock(); |
| 5668 | } |
| 5669 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5670 | /* |
| 5671 | * task tracking -- fork/exit |
| 5672 | * |
Stephane Eranian | 13d7a24 | 2013-08-21 12:10:24 +0200 | [diff] [blame] | 5673 | * enabled by: attr.comm | attr.mmap | attr.mmap2 | attr.mmap_data | attr.task |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5674 | */ |
| 5675 | |
| 5676 | struct perf_task_event { |
| 5677 | struct task_struct *task; |
| 5678 | struct perf_event_context *task_ctx; |
| 5679 | |
| 5680 | struct { |
| 5681 | struct perf_event_header header; |
| 5682 | |
| 5683 | u32 pid; |
| 5684 | u32 ppid; |
| 5685 | u32 tid; |
| 5686 | u32 ptid; |
| 5687 | u64 time; |
| 5688 | } event_id; |
| 5689 | }; |
| 5690 | |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 5691 | static int perf_event_task_match(struct perf_event *event) |
| 5692 | { |
Stephane Eranian | 13d7a24 | 2013-08-21 12:10:24 +0200 | [diff] [blame] | 5693 | return event->attr.comm || event->attr.mmap || |
| 5694 | event->attr.mmap2 || event->attr.mmap_data || |
| 5695 | event->attr.task; |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 5696 | } |
| 5697 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5698 | static void perf_event_task_output(struct perf_event *event, |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5699 | void *data) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5700 | { |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5701 | struct perf_task_event *task_event = data; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5702 | struct perf_output_handle handle; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5703 | struct perf_sample_data sample; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5704 | struct task_struct *task = task_event->task; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5705 | int ret, size = task_event->event_id.header.size; |
Mike Galbraith | 8bb39f9 | 2010-03-26 11:11:33 +0100 | [diff] [blame] | 5706 | |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 5707 | if (!perf_event_task_match(event)) |
| 5708 | return; |
| 5709 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5710 | perf_event_header__init_id(&task_event->event_id.header, &sample, event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5711 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5712 | ret = perf_output_begin(&handle, event, |
Peter Zijlstra | a7ac67e | 2011-06-27 16:47:16 +0200 | [diff] [blame] | 5713 | task_event->event_id.header.size); |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 5714 | if (ret) |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5715 | goto out; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5716 | |
| 5717 | task_event->event_id.pid = perf_event_pid(event, task); |
| 5718 | task_event->event_id.ppid = perf_event_pid(event, current); |
| 5719 | |
| 5720 | task_event->event_id.tid = perf_event_tid(event, task); |
| 5721 | task_event->event_id.ptid = perf_event_tid(event, current); |
| 5722 | |
Peter Zijlstra | 34f4392 | 2015-02-20 14:05:38 +0100 | [diff] [blame] | 5723 | task_event->event_id.time = perf_event_clock(event); |
| 5724 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5725 | perf_output_put(&handle, task_event->event_id); |
| 5726 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5727 | perf_event__output_id_sample(event, &handle, &sample); |
| 5728 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5729 | perf_output_end(&handle); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5730 | out: |
| 5731 | task_event->event_id.header.size = size; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5732 | } |
| 5733 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5734 | static void perf_event_task(struct task_struct *task, |
| 5735 | struct perf_event_context *task_ctx, |
| 5736 | int new) |
| 5737 | { |
| 5738 | struct perf_task_event task_event; |
| 5739 | |
| 5740 | if (!atomic_read(&nr_comm_events) && |
| 5741 | !atomic_read(&nr_mmap_events) && |
| 5742 | !atomic_read(&nr_task_events)) |
| 5743 | return; |
| 5744 | |
| 5745 | task_event = (struct perf_task_event){ |
| 5746 | .task = task, |
| 5747 | .task_ctx = task_ctx, |
| 5748 | .event_id = { |
| 5749 | .header = { |
| 5750 | .type = new ? PERF_RECORD_FORK : PERF_RECORD_EXIT, |
| 5751 | .misc = 0, |
| 5752 | .size = sizeof(task_event.event_id), |
| 5753 | }, |
| 5754 | /* .pid */ |
| 5755 | /* .ppid */ |
| 5756 | /* .tid */ |
| 5757 | /* .ptid */ |
Peter Zijlstra | 34f4392 | 2015-02-20 14:05:38 +0100 | [diff] [blame] | 5758 | /* .time */ |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5759 | }, |
| 5760 | }; |
| 5761 | |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 5762 | perf_event_aux(perf_event_task_output, |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5763 | &task_event, |
| 5764 | task_ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5765 | } |
| 5766 | |
| 5767 | void perf_event_fork(struct task_struct *task) |
| 5768 | { |
| 5769 | perf_event_task(task, NULL, 1); |
| 5770 | } |
| 5771 | |
| 5772 | /* |
| 5773 | * comm tracking |
| 5774 | */ |
| 5775 | |
| 5776 | struct perf_comm_event { |
| 5777 | struct task_struct *task; |
| 5778 | char *comm; |
| 5779 | int comm_size; |
| 5780 | |
| 5781 | struct { |
| 5782 | struct perf_event_header header; |
| 5783 | |
| 5784 | u32 pid; |
| 5785 | u32 tid; |
| 5786 | } event_id; |
| 5787 | }; |
| 5788 | |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 5789 | static int perf_event_comm_match(struct perf_event *event) |
| 5790 | { |
| 5791 | return event->attr.comm; |
| 5792 | } |
| 5793 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5794 | static void perf_event_comm_output(struct perf_event *event, |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5795 | void *data) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5796 | { |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5797 | struct perf_comm_event *comm_event = data; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5798 | struct perf_output_handle handle; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5799 | struct perf_sample_data sample; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5800 | int size = comm_event->event_id.header.size; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5801 | int ret; |
| 5802 | |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 5803 | if (!perf_event_comm_match(event)) |
| 5804 | return; |
| 5805 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5806 | perf_event_header__init_id(&comm_event->event_id.header, &sample, event); |
| 5807 | ret = perf_output_begin(&handle, event, |
Peter Zijlstra | a7ac67e | 2011-06-27 16:47:16 +0200 | [diff] [blame] | 5808 | comm_event->event_id.header.size); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5809 | |
| 5810 | if (ret) |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5811 | goto out; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5812 | |
| 5813 | comm_event->event_id.pid = perf_event_pid(event, comm_event->task); |
| 5814 | comm_event->event_id.tid = perf_event_tid(event, comm_event->task); |
| 5815 | |
| 5816 | perf_output_put(&handle, comm_event->event_id); |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 5817 | __output_copy(&handle, comm_event->comm, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5818 | comm_event->comm_size); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5819 | |
| 5820 | perf_event__output_id_sample(event, &handle, &sample); |
| 5821 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5822 | perf_output_end(&handle); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5823 | out: |
| 5824 | comm_event->event_id.header.size = size; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5825 | } |
| 5826 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5827 | static void perf_event_comm_event(struct perf_comm_event *comm_event) |
| 5828 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5829 | char comm[TASK_COMM_LEN]; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5830 | unsigned int size; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5831 | |
| 5832 | memset(comm, 0, sizeof(comm)); |
Márton Németh | 96b02d7 | 2009-11-21 23:10:15 +0100 | [diff] [blame] | 5833 | strlcpy(comm, comm_event->task->comm, sizeof(comm)); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5834 | size = ALIGN(strlen(comm)+1, sizeof(u64)); |
| 5835 | |
| 5836 | comm_event->comm = comm; |
| 5837 | comm_event->comm_size = size; |
| 5838 | |
| 5839 | comm_event->event_id.header.size = sizeof(comm_event->event_id) + size; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 5840 | |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 5841 | perf_event_aux(perf_event_comm_output, |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5842 | comm_event, |
| 5843 | NULL); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5844 | } |
| 5845 | |
Adrian Hunter | 82b8977 | 2014-05-28 11:45:04 +0300 | [diff] [blame] | 5846 | void perf_event_comm(struct task_struct *task, bool exec) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5847 | { |
| 5848 | struct perf_comm_event comm_event; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5849 | |
| 5850 | if (!atomic_read(&nr_comm_events)) |
| 5851 | return; |
| 5852 | |
| 5853 | comm_event = (struct perf_comm_event){ |
| 5854 | .task = task, |
| 5855 | /* .comm */ |
| 5856 | /* .comm_size */ |
| 5857 | .event_id = { |
| 5858 | .header = { |
| 5859 | .type = PERF_RECORD_COMM, |
Adrian Hunter | 82b8977 | 2014-05-28 11:45:04 +0300 | [diff] [blame] | 5860 | .misc = exec ? PERF_RECORD_MISC_COMM_EXEC : 0, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5861 | /* .size */ |
| 5862 | }, |
| 5863 | /* .pid */ |
| 5864 | /* .tid */ |
| 5865 | }, |
| 5866 | }; |
| 5867 | |
| 5868 | perf_event_comm_event(&comm_event); |
| 5869 | } |
| 5870 | |
| 5871 | /* |
| 5872 | * mmap tracking |
| 5873 | */ |
| 5874 | |
| 5875 | struct perf_mmap_event { |
| 5876 | struct vm_area_struct *vma; |
| 5877 | |
| 5878 | const char *file_name; |
| 5879 | int file_size; |
Stephane Eranian | 13d7a24 | 2013-08-21 12:10:24 +0200 | [diff] [blame] | 5880 | int maj, min; |
| 5881 | u64 ino; |
| 5882 | u64 ino_generation; |
Peter Zijlstra | f972eb6 | 2014-05-19 15:13:47 -0400 | [diff] [blame] | 5883 | u32 prot, flags; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5884 | |
| 5885 | struct { |
| 5886 | struct perf_event_header header; |
| 5887 | |
| 5888 | u32 pid; |
| 5889 | u32 tid; |
| 5890 | u64 start; |
| 5891 | u64 len; |
| 5892 | u64 pgoff; |
| 5893 | } event_id; |
| 5894 | }; |
| 5895 | |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 5896 | static int perf_event_mmap_match(struct perf_event *event, |
| 5897 | void *data) |
| 5898 | { |
| 5899 | struct perf_mmap_event *mmap_event = data; |
| 5900 | struct vm_area_struct *vma = mmap_event->vma; |
| 5901 | int executable = vma->vm_flags & VM_EXEC; |
| 5902 | |
| 5903 | return (!executable && event->attr.mmap_data) || |
Stephane Eranian | 13d7a24 | 2013-08-21 12:10:24 +0200 | [diff] [blame] | 5904 | (executable && (event->attr.mmap || event->attr.mmap2)); |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 5905 | } |
| 5906 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5907 | static void perf_event_mmap_output(struct perf_event *event, |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5908 | void *data) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5909 | { |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 5910 | struct perf_mmap_event *mmap_event = data; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5911 | struct perf_output_handle handle; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5912 | struct perf_sample_data sample; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5913 | int size = mmap_event->event_id.header.size; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5914 | int ret; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5915 | |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 5916 | if (!perf_event_mmap_match(event, data)) |
| 5917 | return; |
| 5918 | |
Stephane Eranian | 13d7a24 | 2013-08-21 12:10:24 +0200 | [diff] [blame] | 5919 | if (event->attr.mmap2) { |
| 5920 | mmap_event->event_id.header.type = PERF_RECORD_MMAP2; |
| 5921 | mmap_event->event_id.header.size += sizeof(mmap_event->maj); |
| 5922 | mmap_event->event_id.header.size += sizeof(mmap_event->min); |
| 5923 | mmap_event->event_id.header.size += sizeof(mmap_event->ino); |
Arnaldo Carvalho de Melo | d008d52 | 2013-09-10 10:24:05 -0300 | [diff] [blame] | 5924 | mmap_event->event_id.header.size += sizeof(mmap_event->ino_generation); |
Peter Zijlstra | f972eb6 | 2014-05-19 15:13:47 -0400 | [diff] [blame] | 5925 | mmap_event->event_id.header.size += sizeof(mmap_event->prot); |
| 5926 | mmap_event->event_id.header.size += sizeof(mmap_event->flags); |
Stephane Eranian | 13d7a24 | 2013-08-21 12:10:24 +0200 | [diff] [blame] | 5927 | } |
| 5928 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5929 | perf_event_header__init_id(&mmap_event->event_id.header, &sample, event); |
| 5930 | ret = perf_output_begin(&handle, event, |
Peter Zijlstra | a7ac67e | 2011-06-27 16:47:16 +0200 | [diff] [blame] | 5931 | mmap_event->event_id.header.size); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5932 | if (ret) |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5933 | goto out; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5934 | |
| 5935 | mmap_event->event_id.pid = perf_event_pid(event, current); |
| 5936 | mmap_event->event_id.tid = perf_event_tid(event, current); |
| 5937 | |
| 5938 | perf_output_put(&handle, mmap_event->event_id); |
Stephane Eranian | 13d7a24 | 2013-08-21 12:10:24 +0200 | [diff] [blame] | 5939 | |
| 5940 | if (event->attr.mmap2) { |
| 5941 | perf_output_put(&handle, mmap_event->maj); |
| 5942 | perf_output_put(&handle, mmap_event->min); |
| 5943 | perf_output_put(&handle, mmap_event->ino); |
| 5944 | perf_output_put(&handle, mmap_event->ino_generation); |
Peter Zijlstra | f972eb6 | 2014-05-19 15:13:47 -0400 | [diff] [blame] | 5945 | perf_output_put(&handle, mmap_event->prot); |
| 5946 | perf_output_put(&handle, mmap_event->flags); |
Stephane Eranian | 13d7a24 | 2013-08-21 12:10:24 +0200 | [diff] [blame] | 5947 | } |
| 5948 | |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 5949 | __output_copy(&handle, mmap_event->file_name, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5950 | mmap_event->file_size); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5951 | |
| 5952 | perf_event__output_id_sample(event, &handle, &sample); |
| 5953 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5954 | perf_output_end(&handle); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 5955 | out: |
| 5956 | mmap_event->event_id.header.size = size; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5957 | } |
| 5958 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5959 | static void perf_event_mmap_event(struct perf_mmap_event *mmap_event) |
| 5960 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5961 | struct vm_area_struct *vma = mmap_event->vma; |
| 5962 | struct file *file = vma->vm_file; |
Stephane Eranian | 13d7a24 | 2013-08-21 12:10:24 +0200 | [diff] [blame] | 5963 | int maj = 0, min = 0; |
| 5964 | u64 ino = 0, gen = 0; |
Peter Zijlstra | f972eb6 | 2014-05-19 15:13:47 -0400 | [diff] [blame] | 5965 | u32 prot = 0, flags = 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5966 | unsigned int size; |
| 5967 | char tmp[16]; |
| 5968 | char *buf = NULL; |
Peter Zijlstra | 2c42cfb | 2013-10-17 00:06:46 +0200 | [diff] [blame] | 5969 | char *name; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5970 | |
| 5971 | if (file) { |
Stephane Eranian | 13d7a24 | 2013-08-21 12:10:24 +0200 | [diff] [blame] | 5972 | struct inode *inode; |
| 5973 | dev_t dev; |
Oleg Nesterov | 3ea2f2b | 2013-10-16 22:10:04 +0200 | [diff] [blame] | 5974 | |
Peter Zijlstra | 2c42cfb | 2013-10-17 00:06:46 +0200 | [diff] [blame] | 5975 | buf = kmalloc(PATH_MAX, GFP_KERNEL); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5976 | if (!buf) { |
Oleg Nesterov | c7e548b | 2013-10-17 20:24:17 +0200 | [diff] [blame] | 5977 | name = "//enomem"; |
| 5978 | goto cpy_name; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5979 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5980 | /* |
Oleg Nesterov | 3ea2f2b | 2013-10-16 22:10:04 +0200 | [diff] [blame] | 5981 | * d_path() works from the end of the rb backwards, so we |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5982 | * need to add enough zero bytes after the string to handle |
| 5983 | * the 64bit alignment we do later. |
| 5984 | */ |
Miklos Szeredi | 9bf39ab | 2015-06-19 10:29:13 +0200 | [diff] [blame] | 5985 | name = file_path(file, buf, PATH_MAX - sizeof(u64)); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5986 | if (IS_ERR(name)) { |
Oleg Nesterov | c7e548b | 2013-10-17 20:24:17 +0200 | [diff] [blame] | 5987 | name = "//toolong"; |
| 5988 | goto cpy_name; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5989 | } |
Stephane Eranian | 13d7a24 | 2013-08-21 12:10:24 +0200 | [diff] [blame] | 5990 | inode = file_inode(vma->vm_file); |
| 5991 | dev = inode->i_sb->s_dev; |
| 5992 | ino = inode->i_ino; |
| 5993 | gen = inode->i_generation; |
| 5994 | maj = MAJOR(dev); |
| 5995 | min = MINOR(dev); |
Peter Zijlstra | f972eb6 | 2014-05-19 15:13:47 -0400 | [diff] [blame] | 5996 | |
| 5997 | if (vma->vm_flags & VM_READ) |
| 5998 | prot |= PROT_READ; |
| 5999 | if (vma->vm_flags & VM_WRITE) |
| 6000 | prot |= PROT_WRITE; |
| 6001 | if (vma->vm_flags & VM_EXEC) |
| 6002 | prot |= PROT_EXEC; |
| 6003 | |
| 6004 | if (vma->vm_flags & VM_MAYSHARE) |
| 6005 | flags = MAP_SHARED; |
| 6006 | else |
| 6007 | flags = MAP_PRIVATE; |
| 6008 | |
| 6009 | if (vma->vm_flags & VM_DENYWRITE) |
| 6010 | flags |= MAP_DENYWRITE; |
| 6011 | if (vma->vm_flags & VM_MAYEXEC) |
| 6012 | flags |= MAP_EXECUTABLE; |
| 6013 | if (vma->vm_flags & VM_LOCKED) |
| 6014 | flags |= MAP_LOCKED; |
| 6015 | if (vma->vm_flags & VM_HUGETLB) |
| 6016 | flags |= MAP_HUGETLB; |
| 6017 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6018 | goto got_name; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6019 | } else { |
Jiri Olsa | fbe26ab | 2014-07-14 17:57:19 +0200 | [diff] [blame] | 6020 | if (vma->vm_ops && vma->vm_ops->name) { |
| 6021 | name = (char *) vma->vm_ops->name(vma); |
| 6022 | if (name) |
| 6023 | goto cpy_name; |
| 6024 | } |
| 6025 | |
Peter Zijlstra | 2c42cfb | 2013-10-17 00:06:46 +0200 | [diff] [blame] | 6026 | name = (char *)arch_vma_name(vma); |
Oleg Nesterov | c7e548b | 2013-10-17 20:24:17 +0200 | [diff] [blame] | 6027 | if (name) |
| 6028 | goto cpy_name; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6029 | |
Oleg Nesterov | 32c5fb7 | 2013-10-16 22:09:45 +0200 | [diff] [blame] | 6030 | if (vma->vm_start <= vma->vm_mm->start_brk && |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6031 | vma->vm_end >= vma->vm_mm->brk) { |
Oleg Nesterov | c7e548b | 2013-10-17 20:24:17 +0200 | [diff] [blame] | 6032 | name = "[heap]"; |
| 6033 | goto cpy_name; |
Oleg Nesterov | 32c5fb7 | 2013-10-16 22:09:45 +0200 | [diff] [blame] | 6034 | } |
| 6035 | if (vma->vm_start <= vma->vm_mm->start_stack && |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6036 | vma->vm_end >= vma->vm_mm->start_stack) { |
Oleg Nesterov | c7e548b | 2013-10-17 20:24:17 +0200 | [diff] [blame] | 6037 | name = "[stack]"; |
| 6038 | goto cpy_name; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6039 | } |
| 6040 | |
Oleg Nesterov | c7e548b | 2013-10-17 20:24:17 +0200 | [diff] [blame] | 6041 | name = "//anon"; |
| 6042 | goto cpy_name; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6043 | } |
| 6044 | |
Oleg Nesterov | c7e548b | 2013-10-17 20:24:17 +0200 | [diff] [blame] | 6045 | cpy_name: |
| 6046 | strlcpy(tmp, name, sizeof(tmp)); |
| 6047 | name = tmp; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6048 | got_name: |
Peter Zijlstra | 2c42cfb | 2013-10-17 00:06:46 +0200 | [diff] [blame] | 6049 | /* |
| 6050 | * Since our buffer works in 8 byte units we need to align our string |
| 6051 | * size to a multiple of 8. However, we must guarantee the tail end is |
| 6052 | * zero'd out to avoid leaking random bits to userspace. |
| 6053 | */ |
| 6054 | size = strlen(name)+1; |
| 6055 | while (!IS_ALIGNED(size, sizeof(u64))) |
| 6056 | name[size++] = '\0'; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6057 | |
| 6058 | mmap_event->file_name = name; |
| 6059 | mmap_event->file_size = size; |
Stephane Eranian | 13d7a24 | 2013-08-21 12:10:24 +0200 | [diff] [blame] | 6060 | mmap_event->maj = maj; |
| 6061 | mmap_event->min = min; |
| 6062 | mmap_event->ino = ino; |
| 6063 | mmap_event->ino_generation = gen; |
Peter Zijlstra | f972eb6 | 2014-05-19 15:13:47 -0400 | [diff] [blame] | 6064 | mmap_event->prot = prot; |
| 6065 | mmap_event->flags = flags; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6066 | |
Stephane Eranian | 2fe8542 | 2013-01-24 16:10:39 +0100 | [diff] [blame] | 6067 | if (!(vma->vm_flags & VM_EXEC)) |
| 6068 | mmap_event->event_id.header.misc |= PERF_RECORD_MISC_MMAP_DATA; |
| 6069 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6070 | mmap_event->event_id.header.size = sizeof(mmap_event->event_id) + size; |
| 6071 | |
Jiri Olsa | 6751684 | 2013-07-09 18:56:31 +0200 | [diff] [blame] | 6072 | perf_event_aux(perf_event_mmap_output, |
Jiri Olsa | 52d857a | 2013-05-06 18:27:18 +0200 | [diff] [blame] | 6073 | mmap_event, |
| 6074 | NULL); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6075 | |
| 6076 | kfree(buf); |
| 6077 | } |
| 6078 | |
Eric B Munson | 3af9e85 | 2010-05-18 15:30:49 +0100 | [diff] [blame] | 6079 | void perf_event_mmap(struct vm_area_struct *vma) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6080 | { |
| 6081 | struct perf_mmap_event mmap_event; |
| 6082 | |
| 6083 | if (!atomic_read(&nr_mmap_events)) |
| 6084 | return; |
| 6085 | |
| 6086 | mmap_event = (struct perf_mmap_event){ |
| 6087 | .vma = vma, |
| 6088 | /* .file_name */ |
| 6089 | /* .file_size */ |
| 6090 | .event_id = { |
| 6091 | .header = { |
| 6092 | .type = PERF_RECORD_MMAP, |
Zhang, Yanmin | 39447b3 | 2010-04-19 13:32:41 +0800 | [diff] [blame] | 6093 | .misc = PERF_RECORD_MISC_USER, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6094 | /* .size */ |
| 6095 | }, |
| 6096 | /* .pid */ |
| 6097 | /* .tid */ |
| 6098 | .start = vma->vm_start, |
| 6099 | .len = vma->vm_end - vma->vm_start, |
Peter Zijlstra | 3a0304e | 2010-02-26 10:33:41 +0100 | [diff] [blame] | 6100 | .pgoff = (u64)vma->vm_pgoff << PAGE_SHIFT, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6101 | }, |
Stephane Eranian | 13d7a24 | 2013-08-21 12:10:24 +0200 | [diff] [blame] | 6102 | /* .maj (attr_mmap2 only) */ |
| 6103 | /* .min (attr_mmap2 only) */ |
| 6104 | /* .ino (attr_mmap2 only) */ |
| 6105 | /* .ino_generation (attr_mmap2 only) */ |
Peter Zijlstra | f972eb6 | 2014-05-19 15:13:47 -0400 | [diff] [blame] | 6106 | /* .prot (attr_mmap2 only) */ |
| 6107 | /* .flags (attr_mmap2 only) */ |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6108 | }; |
| 6109 | |
| 6110 | perf_event_mmap_event(&mmap_event); |
| 6111 | } |
| 6112 | |
Alexander Shishkin | 68db7e9 | 2015-01-14 14:18:15 +0200 | [diff] [blame] | 6113 | void perf_event_aux_event(struct perf_event *event, unsigned long head, |
| 6114 | unsigned long size, u64 flags) |
| 6115 | { |
| 6116 | struct perf_output_handle handle; |
| 6117 | struct perf_sample_data sample; |
| 6118 | struct perf_aux_event { |
| 6119 | struct perf_event_header header; |
| 6120 | u64 offset; |
| 6121 | u64 size; |
| 6122 | u64 flags; |
| 6123 | } rec = { |
| 6124 | .header = { |
| 6125 | .type = PERF_RECORD_AUX, |
| 6126 | .misc = 0, |
| 6127 | .size = sizeof(rec), |
| 6128 | }, |
| 6129 | .offset = head, |
| 6130 | .size = size, |
| 6131 | .flags = flags, |
| 6132 | }; |
| 6133 | int ret; |
| 6134 | |
| 6135 | perf_event_header__init_id(&rec.header, &sample, event); |
| 6136 | ret = perf_output_begin(&handle, event, rec.header.size); |
| 6137 | |
| 6138 | if (ret) |
| 6139 | return; |
| 6140 | |
| 6141 | perf_output_put(&handle, rec); |
| 6142 | perf_event__output_id_sample(event, &handle, &sample); |
| 6143 | |
| 6144 | perf_output_end(&handle); |
| 6145 | } |
| 6146 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6147 | /* |
Kan Liang | f38b0db | 2015-05-10 15:13:14 -0400 | [diff] [blame] | 6148 | * Lost/dropped samples logging |
| 6149 | */ |
| 6150 | void perf_log_lost_samples(struct perf_event *event, u64 lost) |
| 6151 | { |
| 6152 | struct perf_output_handle handle; |
| 6153 | struct perf_sample_data sample; |
| 6154 | int ret; |
| 6155 | |
| 6156 | struct { |
| 6157 | struct perf_event_header header; |
| 6158 | u64 lost; |
| 6159 | } lost_samples_event = { |
| 6160 | .header = { |
| 6161 | .type = PERF_RECORD_LOST_SAMPLES, |
| 6162 | .misc = 0, |
| 6163 | .size = sizeof(lost_samples_event), |
| 6164 | }, |
| 6165 | .lost = lost, |
| 6166 | }; |
| 6167 | |
| 6168 | perf_event_header__init_id(&lost_samples_event.header, &sample, event); |
| 6169 | |
| 6170 | ret = perf_output_begin(&handle, event, |
| 6171 | lost_samples_event.header.size); |
| 6172 | if (ret) |
| 6173 | return; |
| 6174 | |
| 6175 | perf_output_put(&handle, lost_samples_event); |
| 6176 | perf_event__output_id_sample(event, &handle, &sample); |
| 6177 | perf_output_end(&handle); |
| 6178 | } |
| 6179 | |
| 6180 | /* |
Adrian Hunter | 45ac140 | 2015-07-21 12:44:02 +0300 | [diff] [blame] | 6181 | * context_switch tracking |
| 6182 | */ |
| 6183 | |
| 6184 | struct perf_switch_event { |
| 6185 | struct task_struct *task; |
| 6186 | struct task_struct *next_prev; |
| 6187 | |
| 6188 | struct { |
| 6189 | struct perf_event_header header; |
| 6190 | u32 next_prev_pid; |
| 6191 | u32 next_prev_tid; |
| 6192 | } event_id; |
| 6193 | }; |
| 6194 | |
| 6195 | static int perf_event_switch_match(struct perf_event *event) |
| 6196 | { |
| 6197 | return event->attr.context_switch; |
| 6198 | } |
| 6199 | |
| 6200 | static void perf_event_switch_output(struct perf_event *event, void *data) |
| 6201 | { |
| 6202 | struct perf_switch_event *se = data; |
| 6203 | struct perf_output_handle handle; |
| 6204 | struct perf_sample_data sample; |
| 6205 | int ret; |
| 6206 | |
| 6207 | if (!perf_event_switch_match(event)) |
| 6208 | return; |
| 6209 | |
| 6210 | /* Only CPU-wide events are allowed to see next/prev pid/tid */ |
| 6211 | if (event->ctx->task) { |
| 6212 | se->event_id.header.type = PERF_RECORD_SWITCH; |
| 6213 | se->event_id.header.size = sizeof(se->event_id.header); |
| 6214 | } else { |
| 6215 | se->event_id.header.type = PERF_RECORD_SWITCH_CPU_WIDE; |
| 6216 | se->event_id.header.size = sizeof(se->event_id); |
| 6217 | se->event_id.next_prev_pid = |
| 6218 | perf_event_pid(event, se->next_prev); |
| 6219 | se->event_id.next_prev_tid = |
| 6220 | perf_event_tid(event, se->next_prev); |
| 6221 | } |
| 6222 | |
| 6223 | perf_event_header__init_id(&se->event_id.header, &sample, event); |
| 6224 | |
| 6225 | ret = perf_output_begin(&handle, event, se->event_id.header.size); |
| 6226 | if (ret) |
| 6227 | return; |
| 6228 | |
| 6229 | if (event->ctx->task) |
| 6230 | perf_output_put(&handle, se->event_id.header); |
| 6231 | else |
| 6232 | perf_output_put(&handle, se->event_id); |
| 6233 | |
| 6234 | perf_event__output_id_sample(event, &handle, &sample); |
| 6235 | |
| 6236 | perf_output_end(&handle); |
| 6237 | } |
| 6238 | |
| 6239 | static void perf_event_switch(struct task_struct *task, |
| 6240 | struct task_struct *next_prev, bool sched_in) |
| 6241 | { |
| 6242 | struct perf_switch_event switch_event; |
| 6243 | |
| 6244 | /* N.B. caller checks nr_switch_events != 0 */ |
| 6245 | |
| 6246 | switch_event = (struct perf_switch_event){ |
| 6247 | .task = task, |
| 6248 | .next_prev = next_prev, |
| 6249 | .event_id = { |
| 6250 | .header = { |
| 6251 | /* .type */ |
| 6252 | .misc = sched_in ? 0 : PERF_RECORD_MISC_SWITCH_OUT, |
| 6253 | /* .size */ |
| 6254 | }, |
| 6255 | /* .next_prev_pid */ |
| 6256 | /* .next_prev_tid */ |
| 6257 | }, |
| 6258 | }; |
| 6259 | |
| 6260 | perf_event_aux(perf_event_switch_output, |
| 6261 | &switch_event, |
| 6262 | NULL); |
| 6263 | } |
| 6264 | |
| 6265 | /* |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6266 | * IRQ throttle logging |
| 6267 | */ |
| 6268 | |
| 6269 | static void perf_log_throttle(struct perf_event *event, int enable) |
| 6270 | { |
| 6271 | struct perf_output_handle handle; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 6272 | struct perf_sample_data sample; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6273 | int ret; |
| 6274 | |
| 6275 | struct { |
| 6276 | struct perf_event_header header; |
| 6277 | u64 time; |
| 6278 | u64 id; |
| 6279 | u64 stream_id; |
| 6280 | } throttle_event = { |
| 6281 | .header = { |
| 6282 | .type = PERF_RECORD_THROTTLE, |
| 6283 | .misc = 0, |
| 6284 | .size = sizeof(throttle_event), |
| 6285 | }, |
Peter Zijlstra | 34f4392 | 2015-02-20 14:05:38 +0100 | [diff] [blame] | 6286 | .time = perf_event_clock(event), |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6287 | .id = primary_event_id(event), |
| 6288 | .stream_id = event->id, |
| 6289 | }; |
| 6290 | |
| 6291 | if (enable) |
| 6292 | throttle_event.header.type = PERF_RECORD_UNTHROTTLE; |
| 6293 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 6294 | perf_event_header__init_id(&throttle_event.header, &sample, event); |
| 6295 | |
| 6296 | ret = perf_output_begin(&handle, event, |
Peter Zijlstra | a7ac67e | 2011-06-27 16:47:16 +0200 | [diff] [blame] | 6297 | throttle_event.header.size); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6298 | if (ret) |
| 6299 | return; |
| 6300 | |
| 6301 | perf_output_put(&handle, throttle_event); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 6302 | perf_event__output_id_sample(event, &handle, &sample); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6303 | perf_output_end(&handle); |
| 6304 | } |
| 6305 | |
Alexander Shishkin | ec0d772 | 2015-01-14 14:18:23 +0200 | [diff] [blame] | 6306 | static void perf_log_itrace_start(struct perf_event *event) |
| 6307 | { |
| 6308 | struct perf_output_handle handle; |
| 6309 | struct perf_sample_data sample; |
| 6310 | struct perf_aux_event { |
| 6311 | struct perf_event_header header; |
| 6312 | u32 pid; |
| 6313 | u32 tid; |
| 6314 | } rec; |
| 6315 | int ret; |
| 6316 | |
| 6317 | if (event->parent) |
| 6318 | event = event->parent; |
| 6319 | |
| 6320 | if (!(event->pmu->capabilities & PERF_PMU_CAP_ITRACE) || |
| 6321 | event->hw.itrace_started) |
| 6322 | return; |
| 6323 | |
Alexander Shishkin | ec0d772 | 2015-01-14 14:18:23 +0200 | [diff] [blame] | 6324 | rec.header.type = PERF_RECORD_ITRACE_START; |
| 6325 | rec.header.misc = 0; |
| 6326 | rec.header.size = sizeof(rec); |
| 6327 | rec.pid = perf_event_pid(event, current); |
| 6328 | rec.tid = perf_event_tid(event, current); |
| 6329 | |
| 6330 | perf_event_header__init_id(&rec.header, &sample, event); |
| 6331 | ret = perf_output_begin(&handle, event, rec.header.size); |
| 6332 | |
| 6333 | if (ret) |
| 6334 | return; |
| 6335 | |
| 6336 | perf_output_put(&handle, rec); |
| 6337 | perf_event__output_id_sample(event, &handle, &sample); |
| 6338 | |
| 6339 | perf_output_end(&handle); |
| 6340 | } |
| 6341 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6342 | /* |
| 6343 | * Generic event overflow handling, sampling. |
| 6344 | */ |
| 6345 | |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6346 | static int __perf_event_overflow(struct perf_event *event, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6347 | int throttle, struct perf_sample_data *data, |
| 6348 | struct pt_regs *regs) |
| 6349 | { |
| 6350 | int events = atomic_read(&event->event_limit); |
| 6351 | struct hw_perf_event *hwc = &event->hw; |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 6352 | u64 seq; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6353 | int ret = 0; |
| 6354 | |
Peter Zijlstra | 9639882 | 2010-11-24 18:55:29 +0100 | [diff] [blame] | 6355 | /* |
| 6356 | * Non-sampling counters might still use the PMI to fold short |
| 6357 | * hardware counters, ignore those. |
| 6358 | */ |
| 6359 | if (unlikely(!is_sampling_event(event))) |
| 6360 | return 0; |
| 6361 | |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 6362 | seq = __this_cpu_read(perf_throttled_seq); |
| 6363 | if (seq != hwc->interrupts_seq) { |
| 6364 | hwc->interrupts_seq = seq; |
| 6365 | hwc->interrupts = 1; |
| 6366 | } else { |
| 6367 | hwc->interrupts++; |
| 6368 | if (unlikely(throttle |
| 6369 | && hwc->interrupts >= max_samples_per_tick)) { |
| 6370 | __this_cpu_inc(perf_throttled_count); |
Peter Zijlstra | 163ec43 | 2011-02-16 11:22:34 +0100 | [diff] [blame] | 6371 | hwc->interrupts = MAX_INTERRUPTS; |
| 6372 | perf_log_throttle(event, 0); |
Frederic Weisbecker | d84153d | 2013-07-23 02:31:05 +0200 | [diff] [blame] | 6373 | tick_nohz_full_kick(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6374 | ret = 1; |
| 6375 | } |
Stephane Eranian | e050e3f | 2012-01-26 17:03:19 +0100 | [diff] [blame] | 6376 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6377 | |
| 6378 | if (event->attr.freq) { |
| 6379 | u64 now = perf_clock(); |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 6380 | s64 delta = now - hwc->freq_time_stamp; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6381 | |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 6382 | hwc->freq_time_stamp = now; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6383 | |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 6384 | if (delta > 0 && delta < 2*TICK_NSEC) |
Stephane Eranian | f39d47f | 2012-02-07 14:39:57 +0100 | [diff] [blame] | 6385 | perf_adjust_period(event, delta, hwc->last_period, true); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6386 | } |
| 6387 | |
| 6388 | /* |
| 6389 | * XXX event_limit might not quite work as expected on inherited |
| 6390 | * events |
| 6391 | */ |
| 6392 | |
| 6393 | event->pending_kill = POLL_IN; |
| 6394 | if (events && atomic_dec_and_test(&event->event_limit)) { |
| 6395 | ret = 1; |
| 6396 | event->pending_kill = POLL_HUP; |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6397 | event->pending_disable = 1; |
| 6398 | irq_work_queue(&event->pending); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6399 | } |
| 6400 | |
Peter Zijlstra | 453f19e | 2009-11-20 22:19:43 +0100 | [diff] [blame] | 6401 | if (event->overflow_handler) |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6402 | event->overflow_handler(event, data, regs); |
Peter Zijlstra | 453f19e | 2009-11-20 22:19:43 +0100 | [diff] [blame] | 6403 | else |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6404 | perf_event_output(event, data, regs); |
Peter Zijlstra | 453f19e | 2009-11-20 22:19:43 +0100 | [diff] [blame] | 6405 | |
Peter Zijlstra | fed66e2cd | 2015-06-11 10:32:01 +0200 | [diff] [blame] | 6406 | if (*perf_event_fasync(event) && event->pending_kill) { |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6407 | event->pending_wakeup = 1; |
| 6408 | irq_work_queue(&event->pending); |
Peter Zijlstra | f506b3d | 2011-05-26 17:02:53 +0200 | [diff] [blame] | 6409 | } |
| 6410 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6411 | return ret; |
| 6412 | } |
| 6413 | |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6414 | int perf_event_overflow(struct perf_event *event, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6415 | struct perf_sample_data *data, |
| 6416 | struct pt_regs *regs) |
| 6417 | { |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6418 | return __perf_event_overflow(event, 1, data, regs); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6419 | } |
| 6420 | |
| 6421 | /* |
| 6422 | * Generic software event infrastructure |
| 6423 | */ |
| 6424 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6425 | struct swevent_htable { |
| 6426 | struct swevent_hlist *swevent_hlist; |
| 6427 | struct mutex hlist_mutex; |
| 6428 | int hlist_refcount; |
| 6429 | |
| 6430 | /* Recursion avoidance in each contexts */ |
| 6431 | int recursion[PERF_NR_CONTEXTS]; |
| 6432 | }; |
| 6433 | |
| 6434 | static DEFINE_PER_CPU(struct swevent_htable, swevent_htable); |
| 6435 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6436 | /* |
| 6437 | * We directly increment event->count and keep a second value in |
| 6438 | * event->hw.period_left to count intervals. This period event |
| 6439 | * is kept in the range [-sample_period, 0] so that we can use the |
| 6440 | * sign as trigger. |
| 6441 | */ |
| 6442 | |
Jiri Olsa | ab57384 | 2013-05-01 17:25:44 +0200 | [diff] [blame] | 6443 | u64 perf_swevent_set_period(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6444 | { |
| 6445 | struct hw_perf_event *hwc = &event->hw; |
| 6446 | u64 period = hwc->last_period; |
| 6447 | u64 nr, offset; |
| 6448 | s64 old, val; |
| 6449 | |
| 6450 | hwc->last_period = hwc->sample_period; |
| 6451 | |
| 6452 | again: |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 6453 | old = val = local64_read(&hwc->period_left); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6454 | if (val < 0) |
| 6455 | return 0; |
| 6456 | |
| 6457 | nr = div64_u64(period + val, period); |
| 6458 | offset = nr * period; |
| 6459 | val -= offset; |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 6460 | if (local64_cmpxchg(&hwc->period_left, old, val) != old) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6461 | goto again; |
| 6462 | |
| 6463 | return nr; |
| 6464 | } |
| 6465 | |
Peter Zijlstra | 0cff784 | 2009-11-20 22:19:44 +0100 | [diff] [blame] | 6466 | static void perf_swevent_overflow(struct perf_event *event, u64 overflow, |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6467 | struct perf_sample_data *data, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6468 | struct pt_regs *regs) |
| 6469 | { |
| 6470 | struct hw_perf_event *hwc = &event->hw; |
| 6471 | int throttle = 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6472 | |
Peter Zijlstra | 0cff784 | 2009-11-20 22:19:44 +0100 | [diff] [blame] | 6473 | if (!overflow) |
| 6474 | overflow = perf_swevent_set_period(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6475 | |
| 6476 | if (hwc->interrupts == MAX_INTERRUPTS) |
| 6477 | return; |
| 6478 | |
| 6479 | for (; overflow; overflow--) { |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6480 | if (__perf_event_overflow(event, throttle, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6481 | data, regs)) { |
| 6482 | /* |
| 6483 | * We inhibit the overflow from happening when |
| 6484 | * hwc->interrupts == MAX_INTERRUPTS. |
| 6485 | */ |
| 6486 | break; |
| 6487 | } |
| 6488 | throttle = 1; |
| 6489 | } |
| 6490 | } |
| 6491 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 6492 | static void perf_swevent_event(struct perf_event *event, u64 nr, |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6493 | struct perf_sample_data *data, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6494 | struct pt_regs *regs) |
| 6495 | { |
| 6496 | struct hw_perf_event *hwc = &event->hw; |
| 6497 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 6498 | local64_add(nr, &event->count); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6499 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6500 | if (!regs) |
| 6501 | return; |
| 6502 | |
Franck Bui-Huu | 6c7e550 | 2010-11-23 16:21:43 +0100 | [diff] [blame] | 6503 | if (!is_sampling_event(event)) |
Peter Zijlstra | 0cff784 | 2009-11-20 22:19:44 +0100 | [diff] [blame] | 6504 | return; |
| 6505 | |
Andrew Vagin | 5d81e5c | 2011-11-07 15:54:12 +0300 | [diff] [blame] | 6506 | if ((event->attr.sample_type & PERF_SAMPLE_PERIOD) && !event->attr.freq) { |
| 6507 | data->period = nr; |
| 6508 | return perf_swevent_overflow(event, 1, data, regs); |
| 6509 | } else |
| 6510 | data->period = event->hw.last_period; |
| 6511 | |
Peter Zijlstra | 0cff784 | 2009-11-20 22:19:44 +0100 | [diff] [blame] | 6512 | if (nr == 1 && hwc->sample_period == 1 && !event->attr.freq) |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6513 | return perf_swevent_overflow(event, 1, data, regs); |
Peter Zijlstra | 0cff784 | 2009-11-20 22:19:44 +0100 | [diff] [blame] | 6514 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 6515 | if (local64_add_negative(nr, &hwc->period_left)) |
Peter Zijlstra | 0cff784 | 2009-11-20 22:19:44 +0100 | [diff] [blame] | 6516 | return; |
| 6517 | |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6518 | perf_swevent_overflow(event, 0, data, regs); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6519 | } |
| 6520 | |
Frederic Weisbecker | f5ffe02 | 2009-11-23 15:42:34 +0100 | [diff] [blame] | 6521 | static int perf_exclude_event(struct perf_event *event, |
| 6522 | struct pt_regs *regs) |
| 6523 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 6524 | if (event->hw.state & PERF_HES_STOPPED) |
Frederic Weisbecker | 91b2f48 | 2011-03-07 21:27:08 +0100 | [diff] [blame] | 6525 | return 1; |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 6526 | |
Frederic Weisbecker | f5ffe02 | 2009-11-23 15:42:34 +0100 | [diff] [blame] | 6527 | if (regs) { |
| 6528 | if (event->attr.exclude_user && user_mode(regs)) |
| 6529 | return 1; |
| 6530 | |
| 6531 | if (event->attr.exclude_kernel && !user_mode(regs)) |
| 6532 | return 1; |
| 6533 | } |
| 6534 | |
| 6535 | return 0; |
| 6536 | } |
| 6537 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6538 | static int perf_swevent_match(struct perf_event *event, |
| 6539 | enum perf_type_id type, |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 6540 | u32 event_id, |
| 6541 | struct perf_sample_data *data, |
| 6542 | struct pt_regs *regs) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6543 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6544 | if (event->attr.type != type) |
| 6545 | return 0; |
Frederic Weisbecker | f5ffe02 | 2009-11-23 15:42:34 +0100 | [diff] [blame] | 6546 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6547 | if (event->attr.config != event_id) |
| 6548 | return 0; |
| 6549 | |
Frederic Weisbecker | f5ffe02 | 2009-11-23 15:42:34 +0100 | [diff] [blame] | 6550 | if (perf_exclude_event(event, regs)) |
| 6551 | return 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6552 | |
| 6553 | return 1; |
| 6554 | } |
| 6555 | |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6556 | static inline u64 swevent_hash(u64 type, u32 event_id) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6557 | { |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6558 | u64 val = event_id | (type << 32); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6559 | |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6560 | return hash_64(val, SWEVENT_HLIST_BITS); |
| 6561 | } |
| 6562 | |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 6563 | static inline struct hlist_head * |
| 6564 | __find_swevent_head(struct swevent_hlist *hlist, u64 type, u32 event_id) |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6565 | { |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 6566 | u64 hash = swevent_hash(type, event_id); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6567 | |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 6568 | return &hlist->heads[hash]; |
| 6569 | } |
| 6570 | |
| 6571 | /* For the read side: events when they trigger */ |
| 6572 | static inline struct hlist_head * |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6573 | find_swevent_head_rcu(struct swevent_htable *swhash, u64 type, u32 event_id) |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 6574 | { |
| 6575 | struct swevent_hlist *hlist; |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6576 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6577 | hlist = rcu_dereference(swhash->swevent_hlist); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6578 | if (!hlist) |
| 6579 | return NULL; |
| 6580 | |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 6581 | return __find_swevent_head(hlist, type, event_id); |
| 6582 | } |
| 6583 | |
| 6584 | /* For the event head insertion and removal in the hlist */ |
| 6585 | static inline struct hlist_head * |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6586 | find_swevent_head(struct swevent_htable *swhash, struct perf_event *event) |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 6587 | { |
| 6588 | struct swevent_hlist *hlist; |
| 6589 | u32 event_id = event->attr.config; |
| 6590 | u64 type = event->attr.type; |
| 6591 | |
| 6592 | /* |
| 6593 | * Event scheduling is always serialized against hlist allocation |
| 6594 | * and release. Which makes the protected version suitable here. |
| 6595 | * The context lock guarantees that. |
| 6596 | */ |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6597 | hlist = rcu_dereference_protected(swhash->swevent_hlist, |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 6598 | lockdep_is_held(&event->ctx->lock)); |
| 6599 | if (!hlist) |
| 6600 | return NULL; |
| 6601 | |
| 6602 | return __find_swevent_head(hlist, type, event_id); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6603 | } |
| 6604 | |
| 6605 | static void do_perf_sw_event(enum perf_type_id type, u32 event_id, |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6606 | u64 nr, |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6607 | struct perf_sample_data *data, |
| 6608 | struct pt_regs *regs) |
| 6609 | { |
Christoph Lameter | 4a32fea | 2014-08-17 12:30:27 -0500 | [diff] [blame] | 6610 | struct swevent_htable *swhash = this_cpu_ptr(&swevent_htable); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6611 | struct perf_event *event; |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6612 | struct hlist_head *head; |
| 6613 | |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6614 | rcu_read_lock(); |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6615 | head = find_swevent_head_rcu(swhash, type, event_id); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6616 | if (!head) |
| 6617 | goto end; |
| 6618 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 6619 | hlist_for_each_entry_rcu(event, head, hlist_entry) { |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 6620 | if (perf_swevent_match(event, type, event_id, data, regs)) |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6621 | perf_swevent_event(event, nr, data, regs); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6622 | } |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6623 | end: |
| 6624 | rcu_read_unlock(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6625 | } |
| 6626 | |
Peter Zijlstra (Intel) | 86038c5 | 2014-12-16 12:47:34 +0100 | [diff] [blame] | 6627 | DEFINE_PER_CPU(struct pt_regs, __perf_regs[4]); |
| 6628 | |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 6629 | int perf_swevent_get_recursion_context(void) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6630 | { |
Christoph Lameter | 4a32fea | 2014-08-17 12:30:27 -0500 | [diff] [blame] | 6631 | struct swevent_htable *swhash = this_cpu_ptr(&swevent_htable); |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 6632 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6633 | return get_recursion_context(swhash->recursion); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6634 | } |
Ingo Molnar | 645e8cc | 2009-11-22 12:20:19 +0100 | [diff] [blame] | 6635 | EXPORT_SYMBOL_GPL(perf_swevent_get_recursion_context); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6636 | |
Jesper Juhl | fa9f90b | 2010-11-28 21:39:34 +0100 | [diff] [blame] | 6637 | inline void perf_swevent_put_recursion_context(int rctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6638 | { |
Christoph Lameter | 4a32fea | 2014-08-17 12:30:27 -0500 | [diff] [blame] | 6639 | struct swevent_htable *swhash = this_cpu_ptr(&swevent_htable); |
Frederic Weisbecker | 927c7a9 | 2010-07-01 16:20:36 +0200 | [diff] [blame] | 6640 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6641 | put_recursion_context(swhash->recursion, rctx); |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 6642 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6643 | |
Peter Zijlstra (Intel) | 86038c5 | 2014-12-16 12:47:34 +0100 | [diff] [blame] | 6644 | void ___perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6645 | { |
Ingo Molnar | a4234bf | 2009-11-23 10:57:59 +0100 | [diff] [blame] | 6646 | struct perf_sample_data data; |
Peter Zijlstra (Intel) | 86038c5 | 2014-12-16 12:47:34 +0100 | [diff] [blame] | 6647 | |
| 6648 | if (WARN_ON_ONCE(!regs)) |
| 6649 | return; |
| 6650 | |
| 6651 | perf_sample_data_init(&data, addr, 0); |
| 6652 | do_perf_sw_event(PERF_TYPE_SOFTWARE, event_id, nr, &data, regs); |
| 6653 | } |
| 6654 | |
| 6655 | void __perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr) |
| 6656 | { |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 6657 | int rctx; |
| 6658 | |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6659 | preempt_disable_notrace(); |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 6660 | rctx = perf_swevent_get_recursion_context(); |
Peter Zijlstra (Intel) | 86038c5 | 2014-12-16 12:47:34 +0100 | [diff] [blame] | 6661 | if (unlikely(rctx < 0)) |
| 6662 | goto fail; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6663 | |
Peter Zijlstra (Intel) | 86038c5 | 2014-12-16 12:47:34 +0100 | [diff] [blame] | 6664 | ___perf_sw_event(event_id, nr, regs, addr); |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 6665 | |
| 6666 | perf_swevent_put_recursion_context(rctx); |
Peter Zijlstra (Intel) | 86038c5 | 2014-12-16 12:47:34 +0100 | [diff] [blame] | 6667 | fail: |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6668 | preempt_enable_notrace(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6669 | } |
| 6670 | |
| 6671 | static void perf_swevent_read(struct perf_event *event) |
| 6672 | { |
| 6673 | } |
| 6674 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 6675 | static int perf_swevent_add(struct perf_event *event, int flags) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6676 | { |
Christoph Lameter | 4a32fea | 2014-08-17 12:30:27 -0500 | [diff] [blame] | 6677 | struct swevent_htable *swhash = this_cpu_ptr(&swevent_htable); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6678 | struct hw_perf_event *hwc = &event->hw; |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6679 | struct hlist_head *head; |
| 6680 | |
Franck Bui-Huu | 6c7e550 | 2010-11-23 16:21:43 +0100 | [diff] [blame] | 6681 | if (is_sampling_event(event)) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6682 | hwc->last_period = hwc->sample_period; |
| 6683 | perf_swevent_set_period(event); |
| 6684 | } |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6685 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 6686 | hwc->state = !(flags & PERF_EF_START); |
| 6687 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6688 | head = find_swevent_head(swhash, event); |
Peter Zijlstra | 12ca6ad | 2015-12-15 13:49:05 +0100 | [diff] [blame] | 6689 | if (WARN_ON_ONCE(!head)) |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6690 | return -EINVAL; |
| 6691 | |
| 6692 | hlist_add_head_rcu(&event->hlist_entry, head); |
Shaohua Li | 6a694a6 | 2015-02-05 15:55:32 -0800 | [diff] [blame] | 6693 | perf_event_update_userpage(event); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6694 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6695 | return 0; |
| 6696 | } |
| 6697 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 6698 | static void perf_swevent_del(struct perf_event *event, int flags) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6699 | { |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6700 | hlist_del_rcu(&event->hlist_entry); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6701 | } |
| 6702 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 6703 | static void perf_swevent_start(struct perf_event *event, int flags) |
Peter Zijlstra | c6df8d5 | 2010-06-03 11:21:20 +0200 | [diff] [blame] | 6704 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 6705 | event->hw.state = 0; |
Peter Zijlstra | c6df8d5 | 2010-06-03 11:21:20 +0200 | [diff] [blame] | 6706 | } |
| 6707 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 6708 | static void perf_swevent_stop(struct perf_event *event, int flags) |
Peter Zijlstra | c6df8d5 | 2010-06-03 11:21:20 +0200 | [diff] [blame] | 6709 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 6710 | event->hw.state = PERF_HES_STOPPED; |
Peter Zijlstra | c6df8d5 | 2010-06-03 11:21:20 +0200 | [diff] [blame] | 6711 | } |
| 6712 | |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 6713 | /* Deref the hlist from the update side */ |
| 6714 | static inline struct swevent_hlist * |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6715 | swevent_hlist_deref(struct swevent_htable *swhash) |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 6716 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6717 | return rcu_dereference_protected(swhash->swevent_hlist, |
| 6718 | lockdep_is_held(&swhash->hlist_mutex)); |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 6719 | } |
| 6720 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6721 | static void swevent_hlist_release(struct swevent_htable *swhash) |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6722 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6723 | struct swevent_hlist *hlist = swevent_hlist_deref(swhash); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6724 | |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 6725 | if (!hlist) |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6726 | return; |
| 6727 | |
Andreea-Cristina Bernat | 70691d4 | 2014-08-22 16:26:05 +0300 | [diff] [blame] | 6728 | RCU_INIT_POINTER(swhash->swevent_hlist, NULL); |
Lai Jiangshan | fa4bbc4 | 2011-03-18 12:08:29 +0800 | [diff] [blame] | 6729 | kfree_rcu(hlist, rcu_head); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6730 | } |
| 6731 | |
| 6732 | static void swevent_hlist_put_cpu(struct perf_event *event, int cpu) |
| 6733 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6734 | struct swevent_htable *swhash = &per_cpu(swevent_htable, cpu); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6735 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6736 | mutex_lock(&swhash->hlist_mutex); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6737 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6738 | if (!--swhash->hlist_refcount) |
| 6739 | swevent_hlist_release(swhash); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6740 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6741 | mutex_unlock(&swhash->hlist_mutex); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6742 | } |
| 6743 | |
| 6744 | static void swevent_hlist_put(struct perf_event *event) |
| 6745 | { |
| 6746 | int cpu; |
| 6747 | |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6748 | for_each_possible_cpu(cpu) |
| 6749 | swevent_hlist_put_cpu(event, cpu); |
| 6750 | } |
| 6751 | |
| 6752 | static int swevent_hlist_get_cpu(struct perf_event *event, int cpu) |
| 6753 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6754 | struct swevent_htable *swhash = &per_cpu(swevent_htable, cpu); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6755 | int err = 0; |
| 6756 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6757 | mutex_lock(&swhash->hlist_mutex); |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6758 | if (!swevent_hlist_deref(swhash) && cpu_online(cpu)) { |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6759 | struct swevent_hlist *hlist; |
| 6760 | |
| 6761 | hlist = kzalloc(sizeof(*hlist), GFP_KERNEL); |
| 6762 | if (!hlist) { |
| 6763 | err = -ENOMEM; |
| 6764 | goto exit; |
| 6765 | } |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6766 | rcu_assign_pointer(swhash->swevent_hlist, hlist); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6767 | } |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6768 | swhash->hlist_refcount++; |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 6769 | exit: |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6770 | mutex_unlock(&swhash->hlist_mutex); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6771 | |
| 6772 | return err; |
| 6773 | } |
| 6774 | |
| 6775 | static int swevent_hlist_get(struct perf_event *event) |
| 6776 | { |
| 6777 | int err; |
| 6778 | int cpu, failed_cpu; |
| 6779 | |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6780 | get_online_cpus(); |
| 6781 | for_each_possible_cpu(cpu) { |
| 6782 | err = swevent_hlist_get_cpu(event, cpu); |
| 6783 | if (err) { |
| 6784 | failed_cpu = cpu; |
| 6785 | goto fail; |
| 6786 | } |
| 6787 | } |
| 6788 | put_online_cpus(); |
| 6789 | |
| 6790 | return 0; |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 6791 | fail: |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6792 | for_each_possible_cpu(cpu) { |
| 6793 | if (cpu == failed_cpu) |
| 6794 | break; |
| 6795 | swevent_hlist_put_cpu(event, cpu); |
| 6796 | } |
| 6797 | |
| 6798 | put_online_cpus(); |
| 6799 | return err; |
| 6800 | } |
| 6801 | |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 6802 | struct static_key perf_swevent_enabled[PERF_COUNT_SW_MAX]; |
Frederic Weisbecker | 95476b6 | 2010-04-14 23:42:18 +0200 | [diff] [blame] | 6803 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6804 | static void sw_perf_event_destroy(struct perf_event *event) |
| 6805 | { |
| 6806 | u64 event_id = event->attr.config; |
| 6807 | |
| 6808 | WARN_ON(event->parent); |
| 6809 | |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 6810 | static_key_slow_dec(&perf_swevent_enabled[event_id]); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6811 | swevent_hlist_put(event); |
| 6812 | } |
| 6813 | |
| 6814 | static int perf_swevent_init(struct perf_event *event) |
| 6815 | { |
Tommi Rantala | 8176cce | 2013-04-13 22:49:14 +0300 | [diff] [blame] | 6816 | u64 event_id = event->attr.config; |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6817 | |
| 6818 | if (event->attr.type != PERF_TYPE_SOFTWARE) |
| 6819 | return -ENOENT; |
| 6820 | |
Stephane Eranian | 2481c5f | 2012-02-09 23:20:59 +0100 | [diff] [blame] | 6821 | /* |
| 6822 | * no branch sampling for software events |
| 6823 | */ |
| 6824 | if (has_branch_stack(event)) |
| 6825 | return -EOPNOTSUPP; |
| 6826 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6827 | switch (event_id) { |
| 6828 | case PERF_COUNT_SW_CPU_CLOCK: |
| 6829 | case PERF_COUNT_SW_TASK_CLOCK: |
| 6830 | return -ENOENT; |
| 6831 | |
| 6832 | default: |
| 6833 | break; |
| 6834 | } |
| 6835 | |
Dan Carpenter | ce67783 | 2010-10-24 21:50:42 +0200 | [diff] [blame] | 6836 | if (event_id >= PERF_COUNT_SW_MAX) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6837 | return -ENOENT; |
| 6838 | |
| 6839 | if (!event->parent) { |
| 6840 | int err; |
| 6841 | |
| 6842 | err = swevent_hlist_get(event); |
| 6843 | if (err) |
| 6844 | return err; |
| 6845 | |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 6846 | static_key_slow_inc(&perf_swevent_enabled[event_id]); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6847 | event->destroy = sw_perf_event_destroy; |
| 6848 | } |
| 6849 | |
| 6850 | return 0; |
| 6851 | } |
| 6852 | |
| 6853 | static struct pmu perf_swevent = { |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 6854 | .task_ctx_nr = perf_sw_context, |
| 6855 | |
Peter Zijlstra | 34f4392 | 2015-02-20 14:05:38 +0100 | [diff] [blame] | 6856 | .capabilities = PERF_PMU_CAP_NO_NMI, |
| 6857 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6858 | .event_init = perf_swevent_init, |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 6859 | .add = perf_swevent_add, |
| 6860 | .del = perf_swevent_del, |
| 6861 | .start = perf_swevent_start, |
| 6862 | .stop = perf_swevent_stop, |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6863 | .read = perf_swevent_read, |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6864 | }; |
Frederic Weisbecker | 95476b6 | 2010-04-14 23:42:18 +0200 | [diff] [blame] | 6865 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6866 | #ifdef CONFIG_EVENT_TRACING |
| 6867 | |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6868 | static int perf_tp_filter_match(struct perf_event *event, |
Frederic Weisbecker | 95476b6 | 2010-04-14 23:42:18 +0200 | [diff] [blame] | 6869 | struct perf_sample_data *data) |
| 6870 | { |
| 6871 | void *record = data->raw->data; |
| 6872 | |
Peter Zijlstra | b71b437 | 2015-11-02 10:50:51 +0100 | [diff] [blame] | 6873 | /* only top level events have filters set */ |
| 6874 | if (event->parent) |
| 6875 | event = event->parent; |
| 6876 | |
Frederic Weisbecker | 95476b6 | 2010-04-14 23:42:18 +0200 | [diff] [blame] | 6877 | if (likely(!event->filter) || filter_match_preds(event->filter, record)) |
| 6878 | return 1; |
| 6879 | return 0; |
| 6880 | } |
| 6881 | |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6882 | static int perf_tp_event_match(struct perf_event *event, |
| 6883 | struct perf_sample_data *data, |
| 6884 | struct pt_regs *regs) |
| 6885 | { |
Frederic Weisbecker | a0f7d0f | 2011-03-07 21:27:09 +0100 | [diff] [blame] | 6886 | if (event->hw.state & PERF_HES_STOPPED) |
| 6887 | return 0; |
Peter Zijlstra | 580d607 | 2010-05-20 20:54:31 +0200 | [diff] [blame] | 6888 | /* |
| 6889 | * All tracepoints are from kernel-space. |
| 6890 | */ |
| 6891 | if (event->attr.exclude_kernel) |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6892 | return 0; |
| 6893 | |
| 6894 | if (!perf_tp_filter_match(event, data)) |
| 6895 | return 0; |
| 6896 | |
| 6897 | return 1; |
| 6898 | } |
| 6899 | |
| 6900 | void perf_tp_event(u64 addr, u64 count, void *record, int entry_size, |
Andrew Vagin | e6dab5f | 2012-07-11 18:14:58 +0400 | [diff] [blame] | 6901 | struct pt_regs *regs, struct hlist_head *head, int rctx, |
| 6902 | struct task_struct *task) |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6903 | { |
| 6904 | struct perf_sample_data data; |
| 6905 | struct perf_event *event; |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6906 | |
| 6907 | struct perf_raw_record raw = { |
| 6908 | .size = entry_size, |
| 6909 | .data = record, |
| 6910 | }; |
| 6911 | |
Robert Richter | fd0d000 | 2012-04-02 20:19:08 +0200 | [diff] [blame] | 6912 | perf_sample_data_init(&data, addr, 0); |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6913 | data.raw = &raw; |
| 6914 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 6915 | hlist_for_each_entry_rcu(event, head, hlist_entry) { |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6916 | if (perf_tp_event_match(event, &data, regs)) |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 6917 | perf_swevent_event(event, count, &data, regs); |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6918 | } |
Peter Zijlstra | ecc55f8 | 2010-05-21 15:11:34 +0200 | [diff] [blame] | 6919 | |
Andrew Vagin | e6dab5f | 2012-07-11 18:14:58 +0400 | [diff] [blame] | 6920 | /* |
| 6921 | * If we got specified a target task, also iterate its context and |
| 6922 | * deliver this event there too. |
| 6923 | */ |
| 6924 | if (task && task != current) { |
| 6925 | struct perf_event_context *ctx; |
| 6926 | struct trace_entry *entry = record; |
| 6927 | |
| 6928 | rcu_read_lock(); |
| 6929 | ctx = rcu_dereference(task->perf_event_ctxp[perf_sw_context]); |
| 6930 | if (!ctx) |
| 6931 | goto unlock; |
| 6932 | |
| 6933 | list_for_each_entry_rcu(event, &ctx->event_list, event_entry) { |
| 6934 | if (event->attr.type != PERF_TYPE_TRACEPOINT) |
| 6935 | continue; |
| 6936 | if (event->attr.config != entry->type) |
| 6937 | continue; |
| 6938 | if (perf_tp_event_match(event, &data, regs)) |
| 6939 | perf_swevent_event(event, count, &data, regs); |
| 6940 | } |
| 6941 | unlock: |
| 6942 | rcu_read_unlock(); |
| 6943 | } |
| 6944 | |
Peter Zijlstra | ecc55f8 | 2010-05-21 15:11:34 +0200 | [diff] [blame] | 6945 | perf_swevent_put_recursion_context(rctx); |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6946 | } |
| 6947 | EXPORT_SYMBOL_GPL(perf_tp_event); |
| 6948 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6949 | static void tp_perf_event_destroy(struct perf_event *event) |
| 6950 | { |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6951 | perf_trace_destroy(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6952 | } |
| 6953 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6954 | static int perf_tp_event_init(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6955 | { |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6956 | int err; |
| 6957 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6958 | if (event->attr.type != PERF_TYPE_TRACEPOINT) |
| 6959 | return -ENOENT; |
| 6960 | |
Stephane Eranian | 2481c5f | 2012-02-09 23:20:59 +0100 | [diff] [blame] | 6961 | /* |
| 6962 | * no branch sampling for tracepoint events |
| 6963 | */ |
| 6964 | if (has_branch_stack(event)) |
| 6965 | return -EOPNOTSUPP; |
| 6966 | |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 6967 | err = perf_trace_init(event); |
| 6968 | if (err) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6969 | return err; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6970 | |
| 6971 | event->destroy = tp_perf_event_destroy; |
| 6972 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6973 | return 0; |
| 6974 | } |
| 6975 | |
| 6976 | static struct pmu perf_tracepoint = { |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 6977 | .task_ctx_nr = perf_sw_context, |
| 6978 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6979 | .event_init = perf_tp_event_init, |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 6980 | .add = perf_trace_add, |
| 6981 | .del = perf_trace_del, |
| 6982 | .start = perf_swevent_start, |
| 6983 | .stop = perf_swevent_stop, |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6984 | .read = perf_swevent_read, |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6985 | }; |
| 6986 | |
| 6987 | static inline void perf_tp_register(void) |
| 6988 | { |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 6989 | perf_pmu_register(&perf_tracepoint, "tracepoint", PERF_TYPE_TRACEPOINT); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6990 | } |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 6991 | |
| 6992 | static int perf_event_set_filter(struct perf_event *event, void __user *arg) |
| 6993 | { |
| 6994 | char *filter_str; |
| 6995 | int ret; |
| 6996 | |
| 6997 | if (event->attr.type != PERF_TYPE_TRACEPOINT) |
| 6998 | return -EINVAL; |
| 6999 | |
| 7000 | filter_str = strndup_user(arg, PAGE_SIZE); |
| 7001 | if (IS_ERR(filter_str)) |
| 7002 | return PTR_ERR(filter_str); |
| 7003 | |
| 7004 | ret = ftrace_profile_set_filter(event, event->attr.config, filter_str); |
| 7005 | |
| 7006 | kfree(filter_str); |
| 7007 | return ret; |
| 7008 | } |
| 7009 | |
| 7010 | static void perf_event_free_filter(struct perf_event *event) |
| 7011 | { |
| 7012 | ftrace_profile_free_filter(event); |
| 7013 | } |
| 7014 | |
Alexei Starovoitov | 2541517 | 2015-03-25 12:49:20 -0700 | [diff] [blame] | 7015 | static int perf_event_set_bpf_prog(struct perf_event *event, u32 prog_fd) |
| 7016 | { |
| 7017 | struct bpf_prog *prog; |
| 7018 | |
| 7019 | if (event->attr.type != PERF_TYPE_TRACEPOINT) |
| 7020 | return -EINVAL; |
| 7021 | |
| 7022 | if (event->tp_event->prog) |
| 7023 | return -EEXIST; |
| 7024 | |
Wang Nan | 04a22fa | 2015-07-01 02:13:50 +0000 | [diff] [blame] | 7025 | if (!(event->tp_event->flags & TRACE_EVENT_FL_UKPROBE)) |
| 7026 | /* bpf programs can only be attached to u/kprobes */ |
Alexei Starovoitov | 2541517 | 2015-03-25 12:49:20 -0700 | [diff] [blame] | 7027 | return -EINVAL; |
| 7028 | |
| 7029 | prog = bpf_prog_get(prog_fd); |
| 7030 | if (IS_ERR(prog)) |
| 7031 | return PTR_ERR(prog); |
| 7032 | |
Linus Torvalds | 6c373ca | 2015-04-15 09:00:47 -0700 | [diff] [blame] | 7033 | if (prog->type != BPF_PROG_TYPE_KPROBE) { |
Alexei Starovoitov | 2541517 | 2015-03-25 12:49:20 -0700 | [diff] [blame] | 7034 | /* valid fd, but invalid bpf program type */ |
| 7035 | bpf_prog_put(prog); |
| 7036 | return -EINVAL; |
| 7037 | } |
| 7038 | |
| 7039 | event->tp_event->prog = prog; |
| 7040 | |
| 7041 | return 0; |
| 7042 | } |
| 7043 | |
| 7044 | static void perf_event_free_bpf_prog(struct perf_event *event) |
| 7045 | { |
| 7046 | struct bpf_prog *prog; |
| 7047 | |
| 7048 | if (!event->tp_event) |
| 7049 | return; |
| 7050 | |
| 7051 | prog = event->tp_event->prog; |
| 7052 | if (prog) { |
| 7053 | event->tp_event->prog = NULL; |
| 7054 | bpf_prog_put(prog); |
| 7055 | } |
| 7056 | } |
| 7057 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7058 | #else |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 7059 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7060 | static inline void perf_tp_register(void) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7061 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7062 | } |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 7063 | |
| 7064 | static int perf_event_set_filter(struct perf_event *event, void __user *arg) |
| 7065 | { |
| 7066 | return -ENOENT; |
| 7067 | } |
| 7068 | |
| 7069 | static void perf_event_free_filter(struct perf_event *event) |
| 7070 | { |
| 7071 | } |
| 7072 | |
Alexei Starovoitov | 2541517 | 2015-03-25 12:49:20 -0700 | [diff] [blame] | 7073 | static int perf_event_set_bpf_prog(struct perf_event *event, u32 prog_fd) |
| 7074 | { |
| 7075 | return -ENOENT; |
| 7076 | } |
| 7077 | |
| 7078 | static void perf_event_free_bpf_prog(struct perf_event *event) |
| 7079 | { |
| 7080 | } |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 7081 | #endif /* CONFIG_EVENT_TRACING */ |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7082 | |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 7083 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
Frederic Weisbecker | f5ffe02 | 2009-11-23 15:42:34 +0100 | [diff] [blame] | 7084 | void perf_bp_event(struct perf_event *bp, void *data) |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 7085 | { |
Frederic Weisbecker | f5ffe02 | 2009-11-23 15:42:34 +0100 | [diff] [blame] | 7086 | struct perf_sample_data sample; |
| 7087 | struct pt_regs *regs = data; |
| 7088 | |
Robert Richter | fd0d000 | 2012-04-02 20:19:08 +0200 | [diff] [blame] | 7089 | perf_sample_data_init(&sample, bp->attr.bp_addr, 0); |
Frederic Weisbecker | f5ffe02 | 2009-11-23 15:42:34 +0100 | [diff] [blame] | 7090 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 7091 | if (!bp->hw.state && !perf_exclude_event(bp, regs)) |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 7092 | perf_swevent_event(bp, 1, &sample, regs); |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 7093 | } |
| 7094 | #endif |
| 7095 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7096 | /* |
| 7097 | * hrtimer based swevent callback |
| 7098 | */ |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7099 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7100 | static enum hrtimer_restart perf_swevent_hrtimer(struct hrtimer *hrtimer) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7101 | { |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7102 | enum hrtimer_restart ret = HRTIMER_RESTART; |
| 7103 | struct perf_sample_data data; |
| 7104 | struct pt_regs *regs; |
| 7105 | struct perf_event *event; |
| 7106 | u64 period; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7107 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7108 | event = container_of(hrtimer, struct perf_event, hw.hrtimer); |
Peter Zijlstra | ba3dd36 | 2011-02-15 12:41:46 +0100 | [diff] [blame] | 7109 | |
| 7110 | if (event->state != PERF_EVENT_STATE_ACTIVE) |
| 7111 | return HRTIMER_NORESTART; |
| 7112 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7113 | event->pmu->read(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7114 | |
Robert Richter | fd0d000 | 2012-04-02 20:19:08 +0200 | [diff] [blame] | 7115 | perf_sample_data_init(&data, 0, event->hw.last_period); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7116 | regs = get_irq_regs(); |
| 7117 | |
| 7118 | if (regs && !perf_exclude_event(event, regs)) { |
Paul E. McKenney | 77aeeeb | 2011-11-10 16:02:52 -0800 | [diff] [blame] | 7119 | if (!(event->attr.exclude_idle && is_idle_task(current))) |
Robert Richter | 33b07b8 | 2012-04-05 18:24:43 +0200 | [diff] [blame] | 7120 | if (__perf_event_overflow(event, 1, &data, regs)) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7121 | ret = HRTIMER_NORESTART; |
| 7122 | } |
| 7123 | |
| 7124 | period = max_t(u64, 10000, event->hw.sample_period); |
| 7125 | hrtimer_forward_now(hrtimer, ns_to_ktime(period)); |
| 7126 | |
| 7127 | return ret; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7128 | } |
| 7129 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7130 | static void perf_swevent_start_hrtimer(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7131 | { |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7132 | struct hw_perf_event *hwc = &event->hw; |
Franck Bui-Huu | 5d508e8 | 2010-11-23 16:21:45 +0100 | [diff] [blame] | 7133 | s64 period; |
| 7134 | |
| 7135 | if (!is_sampling_event(event)) |
| 7136 | return; |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7137 | |
Franck Bui-Huu | 5d508e8 | 2010-11-23 16:21:45 +0100 | [diff] [blame] | 7138 | period = local64_read(&hwc->period_left); |
| 7139 | if (period) { |
| 7140 | if (period < 0) |
| 7141 | period = 10000; |
Peter Zijlstra | fa407f3 | 2010-06-24 12:35:12 +0200 | [diff] [blame] | 7142 | |
Franck Bui-Huu | 5d508e8 | 2010-11-23 16:21:45 +0100 | [diff] [blame] | 7143 | local64_set(&hwc->period_left, 0); |
| 7144 | } else { |
| 7145 | period = max_t(u64, 10000, hwc->sample_period); |
| 7146 | } |
Thomas Gleixner | 3497d20 | 2015-04-14 21:09:03 +0000 | [diff] [blame] | 7147 | hrtimer_start(&hwc->hrtimer, ns_to_ktime(period), |
| 7148 | HRTIMER_MODE_REL_PINNED); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7149 | } |
| 7150 | |
| 7151 | static void perf_swevent_cancel_hrtimer(struct perf_event *event) |
| 7152 | { |
| 7153 | struct hw_perf_event *hwc = &event->hw; |
| 7154 | |
Franck Bui-Huu | 6c7e550 | 2010-11-23 16:21:43 +0100 | [diff] [blame] | 7155 | if (is_sampling_event(event)) { |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7156 | ktime_t remaining = hrtimer_get_remaining(&hwc->hrtimer); |
Peter Zijlstra | fa407f3 | 2010-06-24 12:35:12 +0200 | [diff] [blame] | 7157 | local64_set(&hwc->period_left, ktime_to_ns(remaining)); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7158 | |
| 7159 | hrtimer_cancel(&hwc->hrtimer); |
| 7160 | } |
| 7161 | } |
| 7162 | |
Peter Zijlstra | ba3dd36 | 2011-02-15 12:41:46 +0100 | [diff] [blame] | 7163 | static void perf_swevent_init_hrtimer(struct perf_event *event) |
| 7164 | { |
| 7165 | struct hw_perf_event *hwc = &event->hw; |
| 7166 | |
| 7167 | if (!is_sampling_event(event)) |
| 7168 | return; |
| 7169 | |
| 7170 | hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| 7171 | hwc->hrtimer.function = perf_swevent_hrtimer; |
| 7172 | |
| 7173 | /* |
| 7174 | * Since hrtimers have a fixed rate, we can do a static freq->period |
| 7175 | * mapping and avoid the whole period adjust feedback stuff. |
| 7176 | */ |
| 7177 | if (event->attr.freq) { |
| 7178 | long freq = event->attr.sample_freq; |
| 7179 | |
| 7180 | event->attr.sample_period = NSEC_PER_SEC / freq; |
| 7181 | hwc->sample_period = event->attr.sample_period; |
| 7182 | local64_set(&hwc->period_left, hwc->sample_period); |
Namhyung Kim | 778141e | 2013-03-18 11:41:46 +0900 | [diff] [blame] | 7183 | hwc->last_period = hwc->sample_period; |
Peter Zijlstra | ba3dd36 | 2011-02-15 12:41:46 +0100 | [diff] [blame] | 7184 | event->attr.freq = 0; |
| 7185 | } |
| 7186 | } |
| 7187 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7188 | /* |
| 7189 | * Software event: cpu wall time clock |
| 7190 | */ |
| 7191 | |
| 7192 | static void cpu_clock_event_update(struct perf_event *event) |
| 7193 | { |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7194 | s64 prev; |
| 7195 | u64 now; |
| 7196 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 7197 | now = local_clock(); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7198 | prev = local64_xchg(&event->hw.prev_count, now); |
| 7199 | local64_add(now - prev, &event->count); |
| 7200 | } |
| 7201 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 7202 | static void cpu_clock_event_start(struct perf_event *event, int flags) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7203 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 7204 | local64_set(&event->hw.prev_count, local_clock()); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7205 | perf_swevent_start_hrtimer(event); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 7206 | } |
| 7207 | |
| 7208 | static void cpu_clock_event_stop(struct perf_event *event, int flags) |
| 7209 | { |
| 7210 | perf_swevent_cancel_hrtimer(event); |
| 7211 | cpu_clock_event_update(event); |
| 7212 | } |
| 7213 | |
| 7214 | static int cpu_clock_event_add(struct perf_event *event, int flags) |
| 7215 | { |
| 7216 | if (flags & PERF_EF_START) |
| 7217 | cpu_clock_event_start(event, flags); |
Shaohua Li | 6a694a6 | 2015-02-05 15:55:32 -0800 | [diff] [blame] | 7218 | perf_event_update_userpage(event); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7219 | |
| 7220 | return 0; |
| 7221 | } |
| 7222 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 7223 | static void cpu_clock_event_del(struct perf_event *event, int flags) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7224 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 7225 | cpu_clock_event_stop(event, flags); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7226 | } |
| 7227 | |
| 7228 | static void cpu_clock_event_read(struct perf_event *event) |
| 7229 | { |
| 7230 | cpu_clock_event_update(event); |
| 7231 | } |
| 7232 | |
| 7233 | static int cpu_clock_event_init(struct perf_event *event) |
| 7234 | { |
| 7235 | if (event->attr.type != PERF_TYPE_SOFTWARE) |
| 7236 | return -ENOENT; |
| 7237 | |
| 7238 | if (event->attr.config != PERF_COUNT_SW_CPU_CLOCK) |
| 7239 | return -ENOENT; |
| 7240 | |
Stephane Eranian | 2481c5f | 2012-02-09 23:20:59 +0100 | [diff] [blame] | 7241 | /* |
| 7242 | * no branch sampling for software events |
| 7243 | */ |
| 7244 | if (has_branch_stack(event)) |
| 7245 | return -EOPNOTSUPP; |
| 7246 | |
Peter Zijlstra | ba3dd36 | 2011-02-15 12:41:46 +0100 | [diff] [blame] | 7247 | perf_swevent_init_hrtimer(event); |
| 7248 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7249 | return 0; |
| 7250 | } |
| 7251 | |
| 7252 | static struct pmu perf_cpu_clock = { |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 7253 | .task_ctx_nr = perf_sw_context, |
| 7254 | |
Peter Zijlstra | 34f4392 | 2015-02-20 14:05:38 +0100 | [diff] [blame] | 7255 | .capabilities = PERF_PMU_CAP_NO_NMI, |
| 7256 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7257 | .event_init = cpu_clock_event_init, |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 7258 | .add = cpu_clock_event_add, |
| 7259 | .del = cpu_clock_event_del, |
| 7260 | .start = cpu_clock_event_start, |
| 7261 | .stop = cpu_clock_event_stop, |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7262 | .read = cpu_clock_event_read, |
| 7263 | }; |
| 7264 | |
| 7265 | /* |
| 7266 | * Software event: task time clock |
| 7267 | */ |
| 7268 | |
| 7269 | static void task_clock_event_update(struct perf_event *event, u64 now) |
| 7270 | { |
| 7271 | u64 prev; |
| 7272 | s64 delta; |
| 7273 | |
| 7274 | prev = local64_xchg(&event->hw.prev_count, now); |
| 7275 | delta = now - prev; |
| 7276 | local64_add(delta, &event->count); |
| 7277 | } |
| 7278 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 7279 | static void task_clock_event_start(struct perf_event *event, int flags) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7280 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 7281 | local64_set(&event->hw.prev_count, event->ctx->time); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7282 | perf_swevent_start_hrtimer(event); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 7283 | } |
| 7284 | |
| 7285 | static void task_clock_event_stop(struct perf_event *event, int flags) |
| 7286 | { |
| 7287 | perf_swevent_cancel_hrtimer(event); |
| 7288 | task_clock_event_update(event, event->ctx->time); |
| 7289 | } |
| 7290 | |
| 7291 | static int task_clock_event_add(struct perf_event *event, int flags) |
| 7292 | { |
| 7293 | if (flags & PERF_EF_START) |
| 7294 | task_clock_event_start(event, flags); |
Shaohua Li | 6a694a6 | 2015-02-05 15:55:32 -0800 | [diff] [blame] | 7295 | perf_event_update_userpage(event); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7296 | |
| 7297 | return 0; |
| 7298 | } |
| 7299 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 7300 | static void task_clock_event_del(struct perf_event *event, int flags) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7301 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 7302 | task_clock_event_stop(event, PERF_EF_UPDATE); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7303 | } |
| 7304 | |
| 7305 | static void task_clock_event_read(struct perf_event *event) |
| 7306 | { |
Peter Zijlstra | 768a06e | 2011-02-22 16:52:24 +0100 | [diff] [blame] | 7307 | u64 now = perf_clock(); |
| 7308 | u64 delta = now - event->ctx->timestamp; |
| 7309 | u64 time = event->ctx->time + delta; |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7310 | |
| 7311 | task_clock_event_update(event, time); |
| 7312 | } |
| 7313 | |
| 7314 | static int task_clock_event_init(struct perf_event *event) |
| 7315 | { |
| 7316 | if (event->attr.type != PERF_TYPE_SOFTWARE) |
| 7317 | return -ENOENT; |
| 7318 | |
| 7319 | if (event->attr.config != PERF_COUNT_SW_TASK_CLOCK) |
| 7320 | return -ENOENT; |
| 7321 | |
Stephane Eranian | 2481c5f | 2012-02-09 23:20:59 +0100 | [diff] [blame] | 7322 | /* |
| 7323 | * no branch sampling for software events |
| 7324 | */ |
| 7325 | if (has_branch_stack(event)) |
| 7326 | return -EOPNOTSUPP; |
| 7327 | |
Peter Zijlstra | ba3dd36 | 2011-02-15 12:41:46 +0100 | [diff] [blame] | 7328 | perf_swevent_init_hrtimer(event); |
| 7329 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7330 | return 0; |
| 7331 | } |
| 7332 | |
| 7333 | static struct pmu perf_task_clock = { |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 7334 | .task_ctx_nr = perf_sw_context, |
| 7335 | |
Peter Zijlstra | 34f4392 | 2015-02-20 14:05:38 +0100 | [diff] [blame] | 7336 | .capabilities = PERF_PMU_CAP_NO_NMI, |
| 7337 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7338 | .event_init = task_clock_event_init, |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 7339 | .add = task_clock_event_add, |
| 7340 | .del = task_clock_event_del, |
| 7341 | .start = task_clock_event_start, |
| 7342 | .stop = task_clock_event_stop, |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7343 | .read = task_clock_event_read, |
| 7344 | }; |
| 7345 | |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 7346 | static void perf_pmu_nop_void(struct pmu *pmu) |
| 7347 | { |
| 7348 | } |
| 7349 | |
Sukadev Bhattiprolu | fbbe070 | 2015-09-03 20:07:45 -0700 | [diff] [blame] | 7350 | static void perf_pmu_nop_txn(struct pmu *pmu, unsigned int flags) |
| 7351 | { |
| 7352 | } |
| 7353 | |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 7354 | static int perf_pmu_nop_int(struct pmu *pmu) |
| 7355 | { |
| 7356 | return 0; |
| 7357 | } |
| 7358 | |
Geliang Tang | 18ab2cd | 2015-09-27 23:25:50 +0800 | [diff] [blame] | 7359 | static DEFINE_PER_CPU(unsigned int, nop_txn_flags); |
Sukadev Bhattiprolu | fbbe070 | 2015-09-03 20:07:45 -0700 | [diff] [blame] | 7360 | |
| 7361 | static void perf_pmu_start_txn(struct pmu *pmu, unsigned int flags) |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 7362 | { |
Sukadev Bhattiprolu | fbbe070 | 2015-09-03 20:07:45 -0700 | [diff] [blame] | 7363 | __this_cpu_write(nop_txn_flags, flags); |
| 7364 | |
| 7365 | if (flags & ~PERF_PMU_TXN_ADD) |
| 7366 | return; |
| 7367 | |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 7368 | perf_pmu_disable(pmu); |
| 7369 | } |
| 7370 | |
| 7371 | static int perf_pmu_commit_txn(struct pmu *pmu) |
| 7372 | { |
Sukadev Bhattiprolu | fbbe070 | 2015-09-03 20:07:45 -0700 | [diff] [blame] | 7373 | unsigned int flags = __this_cpu_read(nop_txn_flags); |
| 7374 | |
| 7375 | __this_cpu_write(nop_txn_flags, 0); |
| 7376 | |
| 7377 | if (flags & ~PERF_PMU_TXN_ADD) |
| 7378 | return 0; |
| 7379 | |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 7380 | perf_pmu_enable(pmu); |
| 7381 | return 0; |
| 7382 | } |
| 7383 | |
| 7384 | static void perf_pmu_cancel_txn(struct pmu *pmu) |
| 7385 | { |
Sukadev Bhattiprolu | fbbe070 | 2015-09-03 20:07:45 -0700 | [diff] [blame] | 7386 | unsigned int flags = __this_cpu_read(nop_txn_flags); |
| 7387 | |
| 7388 | __this_cpu_write(nop_txn_flags, 0); |
| 7389 | |
| 7390 | if (flags & ~PERF_PMU_TXN_ADD) |
| 7391 | return; |
| 7392 | |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 7393 | perf_pmu_enable(pmu); |
| 7394 | } |
| 7395 | |
Peter Zijlstra | 35edc2a | 2011-11-20 20:36:02 +0100 | [diff] [blame] | 7396 | static int perf_event_idx_default(struct perf_event *event) |
| 7397 | { |
Peter Zijlstra | c719f56 | 2014-10-21 11:10:21 +0200 | [diff] [blame] | 7398 | return 0; |
Peter Zijlstra | 35edc2a | 2011-11-20 20:36:02 +0100 | [diff] [blame] | 7399 | } |
| 7400 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 7401 | /* |
| 7402 | * Ensures all contexts with the same task_ctx_nr have the same |
| 7403 | * pmu_cpu_context too. |
| 7404 | */ |
Mark Rutland | 9e31704 | 2014-02-10 17:44:18 +0000 | [diff] [blame] | 7405 | static struct perf_cpu_context __percpu *find_pmu_context(int ctxn) |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 7406 | { |
| 7407 | struct pmu *pmu; |
| 7408 | |
| 7409 | if (ctxn < 0) |
| 7410 | return NULL; |
| 7411 | |
| 7412 | list_for_each_entry(pmu, &pmus, entry) { |
| 7413 | if (pmu->task_ctx_nr == ctxn) |
| 7414 | return pmu->pmu_cpu_context; |
| 7415 | } |
| 7416 | |
| 7417 | return NULL; |
| 7418 | } |
| 7419 | |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 7420 | static void update_pmu_context(struct pmu *pmu, struct pmu *old_pmu) |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 7421 | { |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 7422 | int cpu; |
| 7423 | |
| 7424 | for_each_possible_cpu(cpu) { |
| 7425 | struct perf_cpu_context *cpuctx; |
| 7426 | |
| 7427 | cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu); |
| 7428 | |
Peter Zijlstra | 3f1f332 | 2012-10-02 15:38:52 +0200 | [diff] [blame] | 7429 | if (cpuctx->unique_pmu == old_pmu) |
| 7430 | cpuctx->unique_pmu = pmu; |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 7431 | } |
| 7432 | } |
| 7433 | |
| 7434 | static void free_pmu_context(struct pmu *pmu) |
| 7435 | { |
| 7436 | struct pmu *i; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 7437 | |
| 7438 | mutex_lock(&pmus_lock); |
| 7439 | /* |
| 7440 | * Like a real lame refcount. |
| 7441 | */ |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 7442 | list_for_each_entry(i, &pmus, entry) { |
| 7443 | if (i->pmu_cpu_context == pmu->pmu_cpu_context) { |
| 7444 | update_pmu_context(i, pmu); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 7445 | goto out; |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 7446 | } |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 7447 | } |
| 7448 | |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 7449 | free_percpu(pmu->pmu_cpu_context); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 7450 | out: |
| 7451 | mutex_unlock(&pmus_lock); |
| 7452 | } |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 7453 | static struct idr pmu_idr; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 7454 | |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 7455 | static ssize_t |
| 7456 | type_show(struct device *dev, struct device_attribute *attr, char *page) |
| 7457 | { |
| 7458 | struct pmu *pmu = dev_get_drvdata(dev); |
| 7459 | |
| 7460 | return snprintf(page, PAGE_SIZE-1, "%d\n", pmu->type); |
| 7461 | } |
Greg Kroah-Hartman | 90826ca | 2013-08-23 14:24:40 -0700 | [diff] [blame] | 7462 | static DEVICE_ATTR_RO(type); |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 7463 | |
Stephane Eranian | 62b8563 | 2013-04-03 14:21:34 +0200 | [diff] [blame] | 7464 | static ssize_t |
| 7465 | perf_event_mux_interval_ms_show(struct device *dev, |
| 7466 | struct device_attribute *attr, |
| 7467 | char *page) |
| 7468 | { |
| 7469 | struct pmu *pmu = dev_get_drvdata(dev); |
| 7470 | |
| 7471 | return snprintf(page, PAGE_SIZE-1, "%d\n", pmu->hrtimer_interval_ms); |
| 7472 | } |
| 7473 | |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 7474 | static DEFINE_MUTEX(mux_interval_mutex); |
| 7475 | |
Stephane Eranian | 62b8563 | 2013-04-03 14:21:34 +0200 | [diff] [blame] | 7476 | static ssize_t |
| 7477 | perf_event_mux_interval_ms_store(struct device *dev, |
| 7478 | struct device_attribute *attr, |
| 7479 | const char *buf, size_t count) |
| 7480 | { |
| 7481 | struct pmu *pmu = dev_get_drvdata(dev); |
| 7482 | int timer, cpu, ret; |
| 7483 | |
| 7484 | ret = kstrtoint(buf, 0, &timer); |
| 7485 | if (ret) |
| 7486 | return ret; |
| 7487 | |
| 7488 | if (timer < 1) |
| 7489 | return -EINVAL; |
| 7490 | |
| 7491 | /* same value, noting to do */ |
| 7492 | if (timer == pmu->hrtimer_interval_ms) |
| 7493 | return count; |
| 7494 | |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 7495 | mutex_lock(&mux_interval_mutex); |
Stephane Eranian | 62b8563 | 2013-04-03 14:21:34 +0200 | [diff] [blame] | 7496 | pmu->hrtimer_interval_ms = timer; |
| 7497 | |
| 7498 | /* update all cpuctx for this PMU */ |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 7499 | get_online_cpus(); |
| 7500 | for_each_online_cpu(cpu) { |
Stephane Eranian | 62b8563 | 2013-04-03 14:21:34 +0200 | [diff] [blame] | 7501 | struct perf_cpu_context *cpuctx; |
| 7502 | cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu); |
| 7503 | cpuctx->hrtimer_interval = ns_to_ktime(NSEC_PER_MSEC * timer); |
| 7504 | |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 7505 | cpu_function_call(cpu, |
| 7506 | (remote_function_f)perf_mux_hrtimer_restart, cpuctx); |
Stephane Eranian | 62b8563 | 2013-04-03 14:21:34 +0200 | [diff] [blame] | 7507 | } |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 7508 | put_online_cpus(); |
| 7509 | mutex_unlock(&mux_interval_mutex); |
Stephane Eranian | 62b8563 | 2013-04-03 14:21:34 +0200 | [diff] [blame] | 7510 | |
| 7511 | return count; |
| 7512 | } |
Greg Kroah-Hartman | 90826ca | 2013-08-23 14:24:40 -0700 | [diff] [blame] | 7513 | static DEVICE_ATTR_RW(perf_event_mux_interval_ms); |
Stephane Eranian | 62b8563 | 2013-04-03 14:21:34 +0200 | [diff] [blame] | 7514 | |
Greg Kroah-Hartman | 90826ca | 2013-08-23 14:24:40 -0700 | [diff] [blame] | 7515 | static struct attribute *pmu_dev_attrs[] = { |
| 7516 | &dev_attr_type.attr, |
| 7517 | &dev_attr_perf_event_mux_interval_ms.attr, |
| 7518 | NULL, |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 7519 | }; |
Greg Kroah-Hartman | 90826ca | 2013-08-23 14:24:40 -0700 | [diff] [blame] | 7520 | ATTRIBUTE_GROUPS(pmu_dev); |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 7521 | |
| 7522 | static int pmu_bus_running; |
| 7523 | static struct bus_type pmu_bus = { |
| 7524 | .name = "event_source", |
Greg Kroah-Hartman | 90826ca | 2013-08-23 14:24:40 -0700 | [diff] [blame] | 7525 | .dev_groups = pmu_dev_groups, |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 7526 | }; |
| 7527 | |
| 7528 | static void pmu_dev_release(struct device *dev) |
| 7529 | { |
| 7530 | kfree(dev); |
| 7531 | } |
| 7532 | |
| 7533 | static int pmu_dev_alloc(struct pmu *pmu) |
| 7534 | { |
| 7535 | int ret = -ENOMEM; |
| 7536 | |
| 7537 | pmu->dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
| 7538 | if (!pmu->dev) |
| 7539 | goto out; |
| 7540 | |
Peter Zijlstra | 0c9d42e | 2011-11-20 23:30:47 +0100 | [diff] [blame] | 7541 | pmu->dev->groups = pmu->attr_groups; |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 7542 | device_initialize(pmu->dev); |
| 7543 | ret = dev_set_name(pmu->dev, "%s", pmu->name); |
| 7544 | if (ret) |
| 7545 | goto free_dev; |
| 7546 | |
| 7547 | dev_set_drvdata(pmu->dev, pmu); |
| 7548 | pmu->dev->bus = &pmu_bus; |
| 7549 | pmu->dev->release = pmu_dev_release; |
| 7550 | ret = device_add(pmu->dev); |
| 7551 | if (ret) |
| 7552 | goto free_dev; |
| 7553 | |
| 7554 | out: |
| 7555 | return ret; |
| 7556 | |
| 7557 | free_dev: |
| 7558 | put_device(pmu->dev); |
| 7559 | goto out; |
| 7560 | } |
| 7561 | |
Peter Zijlstra | 547e9fd | 2011-01-19 12:51:39 +0100 | [diff] [blame] | 7562 | static struct lock_class_key cpuctx_mutex; |
Peter Zijlstra | facc430 | 2011-04-09 21:17:42 +0200 | [diff] [blame] | 7563 | static struct lock_class_key cpuctx_lock; |
Peter Zijlstra | 547e9fd | 2011-01-19 12:51:39 +0100 | [diff] [blame] | 7564 | |
Mischa Jonker | 03d8e80 | 2013-06-04 11:45:48 +0200 | [diff] [blame] | 7565 | int perf_pmu_register(struct pmu *pmu, const char *name, int type) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7566 | { |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 7567 | int cpu, ret; |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 7568 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7569 | mutex_lock(&pmus_lock); |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 7570 | ret = -ENOMEM; |
| 7571 | pmu->pmu_disable_count = alloc_percpu(int); |
| 7572 | if (!pmu->pmu_disable_count) |
| 7573 | goto unlock; |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 7574 | |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 7575 | pmu->type = -1; |
| 7576 | if (!name) |
| 7577 | goto skip_type; |
| 7578 | pmu->name = name; |
| 7579 | |
| 7580 | if (type < 0) { |
Tejun Heo | 0e9c3be | 2013-02-27 17:04:55 -0800 | [diff] [blame] | 7581 | type = idr_alloc(&pmu_idr, pmu, PERF_TYPE_MAX, 0, GFP_KERNEL); |
| 7582 | if (type < 0) { |
| 7583 | ret = type; |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 7584 | goto free_pdc; |
| 7585 | } |
| 7586 | } |
| 7587 | pmu->type = type; |
| 7588 | |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 7589 | if (pmu_bus_running) { |
| 7590 | ret = pmu_dev_alloc(pmu); |
| 7591 | if (ret) |
| 7592 | goto free_idr; |
| 7593 | } |
| 7594 | |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 7595 | skip_type: |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 7596 | pmu->pmu_cpu_context = find_pmu_context(pmu->task_ctx_nr); |
| 7597 | if (pmu->pmu_cpu_context) |
| 7598 | goto got_cpu_context; |
| 7599 | |
Wei Yongjun | c481420 | 2013-04-12 11:05:54 +0800 | [diff] [blame] | 7600 | ret = -ENOMEM; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 7601 | pmu->pmu_cpu_context = alloc_percpu(struct perf_cpu_context); |
| 7602 | if (!pmu->pmu_cpu_context) |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 7603 | goto free_dev; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 7604 | |
| 7605 | for_each_possible_cpu(cpu) { |
| 7606 | struct perf_cpu_context *cpuctx; |
| 7607 | |
| 7608 | cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu); |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 7609 | __perf_event_init_context(&cpuctx->ctx); |
Peter Zijlstra | 547e9fd | 2011-01-19 12:51:39 +0100 | [diff] [blame] | 7610 | lockdep_set_class(&cpuctx->ctx.mutex, &cpuctx_mutex); |
Peter Zijlstra | facc430 | 2011-04-09 21:17:42 +0200 | [diff] [blame] | 7611 | lockdep_set_class(&cpuctx->ctx.lock, &cpuctx_lock); |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 7612 | cpuctx->ctx.pmu = pmu; |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 7613 | |
Peter Zijlstra | 272325c | 2015-04-15 11:41:58 +0200 | [diff] [blame] | 7614 | __perf_mux_hrtimer_init(cpuctx, cpu); |
Stephane Eranian | 9e63020 | 2013-04-03 14:21:33 +0200 | [diff] [blame] | 7615 | |
Peter Zijlstra | 3f1f332 | 2012-10-02 15:38:52 +0200 | [diff] [blame] | 7616 | cpuctx->unique_pmu = pmu; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 7617 | } |
| 7618 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 7619 | got_cpu_context: |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 7620 | if (!pmu->start_txn) { |
| 7621 | if (pmu->pmu_enable) { |
| 7622 | /* |
| 7623 | * If we have pmu_enable/pmu_disable calls, install |
| 7624 | * transaction stubs that use that to try and batch |
| 7625 | * hardware accesses. |
| 7626 | */ |
| 7627 | pmu->start_txn = perf_pmu_start_txn; |
| 7628 | pmu->commit_txn = perf_pmu_commit_txn; |
| 7629 | pmu->cancel_txn = perf_pmu_cancel_txn; |
| 7630 | } else { |
Sukadev Bhattiprolu | fbbe070 | 2015-09-03 20:07:45 -0700 | [diff] [blame] | 7631 | pmu->start_txn = perf_pmu_nop_txn; |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 7632 | pmu->commit_txn = perf_pmu_nop_int; |
| 7633 | pmu->cancel_txn = perf_pmu_nop_void; |
| 7634 | } |
| 7635 | } |
| 7636 | |
| 7637 | if (!pmu->pmu_enable) { |
| 7638 | pmu->pmu_enable = perf_pmu_nop_void; |
| 7639 | pmu->pmu_disable = perf_pmu_nop_void; |
| 7640 | } |
| 7641 | |
Peter Zijlstra | 35edc2a | 2011-11-20 20:36:02 +0100 | [diff] [blame] | 7642 | if (!pmu->event_idx) |
| 7643 | pmu->event_idx = perf_event_idx_default; |
| 7644 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7645 | list_add_rcu(&pmu->entry, &pmus); |
Alexander Shishkin | bed5b25 | 2015-01-30 12:31:06 +0200 | [diff] [blame] | 7646 | atomic_set(&pmu->exclusive_cnt, 0); |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 7647 | ret = 0; |
| 7648 | unlock: |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7649 | mutex_unlock(&pmus_lock); |
| 7650 | |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 7651 | return ret; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 7652 | |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 7653 | free_dev: |
| 7654 | device_del(pmu->dev); |
| 7655 | put_device(pmu->dev); |
| 7656 | |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 7657 | free_idr: |
| 7658 | if (pmu->type >= PERF_TYPE_MAX) |
| 7659 | idr_remove(&pmu_idr, pmu->type); |
| 7660 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 7661 | free_pdc: |
| 7662 | free_percpu(pmu->pmu_disable_count); |
| 7663 | goto unlock; |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7664 | } |
Yan, Zheng | c464c76 | 2014-03-18 16:56:41 +0800 | [diff] [blame] | 7665 | EXPORT_SYMBOL_GPL(perf_pmu_register); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7666 | |
| 7667 | void perf_pmu_unregister(struct pmu *pmu) |
| 7668 | { |
| 7669 | mutex_lock(&pmus_lock); |
| 7670 | list_del_rcu(&pmu->entry); |
| 7671 | mutex_unlock(&pmus_lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7672 | |
| 7673 | /* |
Peter Zijlstra | cde8e88 | 2010-09-13 11:06:55 +0200 | [diff] [blame] | 7674 | * We dereference the pmu list under both SRCU and regular RCU, so |
| 7675 | * synchronize against both of those. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7676 | */ |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7677 | synchronize_srcu(&pmus_srcu); |
Peter Zijlstra | cde8e88 | 2010-09-13 11:06:55 +0200 | [diff] [blame] | 7678 | synchronize_rcu(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7679 | |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 7680 | free_percpu(pmu->pmu_disable_count); |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 7681 | if (pmu->type >= PERF_TYPE_MAX) |
| 7682 | idr_remove(&pmu_idr, pmu->type); |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 7683 | device_del(pmu->dev); |
| 7684 | put_device(pmu->dev); |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 7685 | free_pmu_context(pmu); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7686 | } |
Yan, Zheng | c464c76 | 2014-03-18 16:56:41 +0800 | [diff] [blame] | 7687 | EXPORT_SYMBOL_GPL(perf_pmu_unregister); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7688 | |
Mark Rutland | cc34b98 | 2015-01-07 14:56:51 +0000 | [diff] [blame] | 7689 | static int perf_try_init_event(struct pmu *pmu, struct perf_event *event) |
| 7690 | { |
Peter Zijlstra | ccd41c8 | 2015-02-25 15:56:04 +0100 | [diff] [blame] | 7691 | struct perf_event_context *ctx = NULL; |
Mark Rutland | cc34b98 | 2015-01-07 14:56:51 +0000 | [diff] [blame] | 7692 | int ret; |
| 7693 | |
| 7694 | if (!try_module_get(pmu->module)) |
| 7695 | return -ENODEV; |
Peter Zijlstra | ccd41c8 | 2015-02-25 15:56:04 +0100 | [diff] [blame] | 7696 | |
| 7697 | if (event->group_leader != event) { |
Peter Zijlstra | 8b10c5e | 2015-05-01 16:08:46 +0200 | [diff] [blame] | 7698 | /* |
| 7699 | * This ctx->mutex can nest when we're called through |
| 7700 | * inheritance. See the perf_event_ctx_lock_nested() comment. |
| 7701 | */ |
| 7702 | ctx = perf_event_ctx_lock_nested(event->group_leader, |
| 7703 | SINGLE_DEPTH_NESTING); |
Peter Zijlstra | ccd41c8 | 2015-02-25 15:56:04 +0100 | [diff] [blame] | 7704 | BUG_ON(!ctx); |
| 7705 | } |
| 7706 | |
Mark Rutland | cc34b98 | 2015-01-07 14:56:51 +0000 | [diff] [blame] | 7707 | event->pmu = pmu; |
| 7708 | ret = pmu->event_init(event); |
Peter Zijlstra | ccd41c8 | 2015-02-25 15:56:04 +0100 | [diff] [blame] | 7709 | |
| 7710 | if (ctx) |
| 7711 | perf_event_ctx_unlock(event->group_leader, ctx); |
| 7712 | |
Mark Rutland | cc34b98 | 2015-01-07 14:56:51 +0000 | [diff] [blame] | 7713 | if (ret) |
| 7714 | module_put(pmu->module); |
| 7715 | |
| 7716 | return ret; |
| 7717 | } |
| 7718 | |
Geliang Tang | 18ab2cd | 2015-09-27 23:25:50 +0800 | [diff] [blame] | 7719 | static struct pmu *perf_init_event(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7720 | { |
Peter Zijlstra | 51b0fe3 | 2010-06-11 13:35:57 +0200 | [diff] [blame] | 7721 | struct pmu *pmu = NULL; |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7722 | int idx; |
Lin Ming | 940c5b2 | 2011-02-27 21:13:31 +0800 | [diff] [blame] | 7723 | int ret; |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 7724 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7725 | idx = srcu_read_lock(&pmus_srcu); |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 7726 | |
| 7727 | rcu_read_lock(); |
| 7728 | pmu = idr_find(&pmu_idr, event->attr.type); |
| 7729 | rcu_read_unlock(); |
Lin Ming | 940c5b2 | 2011-02-27 21:13:31 +0800 | [diff] [blame] | 7730 | if (pmu) { |
Mark Rutland | cc34b98 | 2015-01-07 14:56:51 +0000 | [diff] [blame] | 7731 | ret = perf_try_init_event(pmu, event); |
Lin Ming | 940c5b2 | 2011-02-27 21:13:31 +0800 | [diff] [blame] | 7732 | if (ret) |
| 7733 | pmu = ERR_PTR(ret); |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 7734 | goto unlock; |
Lin Ming | 940c5b2 | 2011-02-27 21:13:31 +0800 | [diff] [blame] | 7735 | } |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 7736 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7737 | list_for_each_entry_rcu(pmu, &pmus, entry) { |
Mark Rutland | cc34b98 | 2015-01-07 14:56:51 +0000 | [diff] [blame] | 7738 | ret = perf_try_init_event(pmu, event); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7739 | if (!ret) |
Peter Zijlstra | e5f4d33 | 2010-09-10 17:38:06 +0200 | [diff] [blame] | 7740 | goto unlock; |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 7741 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7742 | if (ret != -ENOENT) { |
| 7743 | pmu = ERR_PTR(ret); |
Peter Zijlstra | e5f4d33 | 2010-09-10 17:38:06 +0200 | [diff] [blame] | 7744 | goto unlock; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7745 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7746 | } |
Peter Zijlstra | e5f4d33 | 2010-09-10 17:38:06 +0200 | [diff] [blame] | 7747 | pmu = ERR_PTR(-ENOENT); |
| 7748 | unlock: |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7749 | srcu_read_unlock(&pmus_srcu, idx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7750 | |
| 7751 | return pmu; |
| 7752 | } |
| 7753 | |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 7754 | static void account_event_cpu(struct perf_event *event, int cpu) |
| 7755 | { |
| 7756 | if (event->parent) |
| 7757 | return; |
| 7758 | |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 7759 | if (is_cgroup_event(event)) |
| 7760 | atomic_inc(&per_cpu(perf_cgroup_events, cpu)); |
| 7761 | } |
| 7762 | |
Frederic Weisbecker | 766d6c0 | 2013-07-23 02:31:01 +0200 | [diff] [blame] | 7763 | static void account_event(struct perf_event *event) |
| 7764 | { |
Peter Zijlstra | 25432ae | 2016-01-08 11:05:09 +0100 | [diff] [blame] | 7765 | bool inc = false; |
| 7766 | |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 7767 | if (event->parent) |
| 7768 | return; |
| 7769 | |
Frederic Weisbecker | 766d6c0 | 2013-07-23 02:31:01 +0200 | [diff] [blame] | 7770 | if (event->attach_state & PERF_ATTACH_TASK) |
Peter Zijlstra | 25432ae | 2016-01-08 11:05:09 +0100 | [diff] [blame] | 7771 | inc = true; |
Frederic Weisbecker | 766d6c0 | 2013-07-23 02:31:01 +0200 | [diff] [blame] | 7772 | if (event->attr.mmap || event->attr.mmap_data) |
| 7773 | atomic_inc(&nr_mmap_events); |
| 7774 | if (event->attr.comm) |
| 7775 | atomic_inc(&nr_comm_events); |
| 7776 | if (event->attr.task) |
| 7777 | atomic_inc(&nr_task_events); |
Frederic Weisbecker | 948b26b | 2013-08-02 18:29:55 +0200 | [diff] [blame] | 7778 | if (event->attr.freq) { |
| 7779 | if (atomic_inc_return(&nr_freq_events) == 1) |
| 7780 | tick_nohz_full_kick_all(); |
| 7781 | } |
Adrian Hunter | 45ac140 | 2015-07-21 12:44:02 +0300 | [diff] [blame] | 7782 | if (event->attr.context_switch) { |
| 7783 | atomic_inc(&nr_switch_events); |
Peter Zijlstra | 25432ae | 2016-01-08 11:05:09 +0100 | [diff] [blame] | 7784 | inc = true; |
Adrian Hunter | 45ac140 | 2015-07-21 12:44:02 +0300 | [diff] [blame] | 7785 | } |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 7786 | if (has_branch_stack(event)) |
Peter Zijlstra | 25432ae | 2016-01-08 11:05:09 +0100 | [diff] [blame] | 7787 | inc = true; |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 7788 | if (is_cgroup_event(event)) |
Peter Zijlstra | 25432ae | 2016-01-08 11:05:09 +0100 | [diff] [blame] | 7789 | inc = true; |
| 7790 | |
| 7791 | if (inc) |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 7792 | static_key_slow_inc(&perf_sched_events.key); |
Frederic Weisbecker | 766d6c0 | 2013-07-23 02:31:01 +0200 | [diff] [blame] | 7793 | |
Frederic Weisbecker | 4beb31f | 2013-07-23 02:31:02 +0200 | [diff] [blame] | 7794 | account_event_cpu(event, event->cpu); |
Frederic Weisbecker | 766d6c0 | 2013-07-23 02:31:01 +0200 | [diff] [blame] | 7795 | } |
| 7796 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7797 | /* |
| 7798 | * Allocate and initialize a event structure |
| 7799 | */ |
| 7800 | static struct perf_event * |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 7801 | perf_event_alloc(struct perf_event_attr *attr, int cpu, |
Peter Zijlstra | d580ff8 | 2010-10-14 17:43:23 +0200 | [diff] [blame] | 7802 | struct task_struct *task, |
| 7803 | struct perf_event *group_leader, |
| 7804 | struct perf_event *parent_event, |
Avi Kivity | 4dc0da8 | 2011-06-29 18:42:35 +0300 | [diff] [blame] | 7805 | perf_overflow_handler_t overflow_handler, |
Matt Fleming | 79dff51 | 2015-01-23 18:45:42 +0000 | [diff] [blame] | 7806 | void *context, int cgroup_fd) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7807 | { |
Peter Zijlstra | 51b0fe3 | 2010-06-11 13:35:57 +0200 | [diff] [blame] | 7808 | struct pmu *pmu; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7809 | struct perf_event *event; |
| 7810 | struct hw_perf_event *hwc; |
Frederic Weisbecker | 90983b1 | 2013-07-23 02:31:00 +0200 | [diff] [blame] | 7811 | long err = -EINVAL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7812 | |
Oleg Nesterov | 66832eb | 2011-01-18 17:10:32 +0100 | [diff] [blame] | 7813 | if ((unsigned)cpu >= nr_cpu_ids) { |
| 7814 | if (!task || cpu != -1) |
| 7815 | return ERR_PTR(-EINVAL); |
| 7816 | } |
| 7817 | |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 7818 | event = kzalloc(sizeof(*event), GFP_KERNEL); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7819 | if (!event) |
| 7820 | return ERR_PTR(-ENOMEM); |
| 7821 | |
| 7822 | /* |
| 7823 | * Single events are their own group leaders, with an |
| 7824 | * empty sibling list: |
| 7825 | */ |
| 7826 | if (!group_leader) |
| 7827 | group_leader = event; |
| 7828 | |
| 7829 | mutex_init(&event->child_mutex); |
| 7830 | INIT_LIST_HEAD(&event->child_list); |
| 7831 | |
| 7832 | INIT_LIST_HEAD(&event->group_entry); |
| 7833 | INIT_LIST_HEAD(&event->event_entry); |
| 7834 | INIT_LIST_HEAD(&event->sibling_list); |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 7835 | INIT_LIST_HEAD(&event->rb_entry); |
Stephane Eranian | 71ad88e | 2013-11-12 17:58:48 +0100 | [diff] [blame] | 7836 | INIT_LIST_HEAD(&event->active_entry); |
Stephane Eranian | f3ae75d | 2014-01-08 11:15:52 +0100 | [diff] [blame] | 7837 | INIT_HLIST_NODE(&event->hlist_entry); |
| 7838 | |
Peter Zijlstra | 10c6db1 | 2011-11-26 02:47:31 +0100 | [diff] [blame] | 7839 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7840 | init_waitqueue_head(&event->waitq); |
Peter Zijlstra | e360adb | 2010-10-14 14:01:34 +0800 | [diff] [blame] | 7841 | init_irq_work(&event->pending, perf_pending_event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7842 | |
| 7843 | mutex_init(&event->mmap_mutex); |
| 7844 | |
Al Viro | a6fa941 | 2012-08-20 14:59:25 +0100 | [diff] [blame] | 7845 | atomic_long_set(&event->refcount, 1); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7846 | event->cpu = cpu; |
| 7847 | event->attr = *attr; |
| 7848 | event->group_leader = group_leader; |
| 7849 | event->pmu = NULL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7850 | event->oncpu = -1; |
| 7851 | |
| 7852 | event->parent = parent_event; |
| 7853 | |
Eric W. Biederman | 17cf22c | 2010-03-02 14:51:53 -0800 | [diff] [blame] | 7854 | event->ns = get_pid_ns(task_active_pid_ns(current)); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7855 | event->id = atomic64_inc_return(&perf_event_id); |
| 7856 | |
| 7857 | event->state = PERF_EVENT_STATE_INACTIVE; |
| 7858 | |
Peter Zijlstra | d580ff8 | 2010-10-14 17:43:23 +0200 | [diff] [blame] | 7859 | if (task) { |
| 7860 | event->attach_state = PERF_ATTACH_TASK; |
Peter Zijlstra | d580ff8 | 2010-10-14 17:43:23 +0200 | [diff] [blame] | 7861 | /* |
Peter Zijlstra | 50f16a8 | 2015-03-05 22:10:19 +0100 | [diff] [blame] | 7862 | * XXX pmu::event_init needs to know what task to account to |
| 7863 | * and we cannot use the ctx information because we need the |
| 7864 | * pmu before we get a ctx. |
Peter Zijlstra | d580ff8 | 2010-10-14 17:43:23 +0200 | [diff] [blame] | 7865 | */ |
Peter Zijlstra | 50f16a8 | 2015-03-05 22:10:19 +0100 | [diff] [blame] | 7866 | event->hw.target = task; |
Peter Zijlstra | d580ff8 | 2010-10-14 17:43:23 +0200 | [diff] [blame] | 7867 | } |
| 7868 | |
Peter Zijlstra | 34f4392 | 2015-02-20 14:05:38 +0100 | [diff] [blame] | 7869 | event->clock = &local_clock; |
| 7870 | if (parent_event) |
| 7871 | event->clock = parent_event->clock; |
| 7872 | |
Avi Kivity | 4dc0da8 | 2011-06-29 18:42:35 +0300 | [diff] [blame] | 7873 | if (!overflow_handler && parent_event) { |
Frederic Weisbecker | b326e95 | 2009-12-05 09:44:31 +0100 | [diff] [blame] | 7874 | overflow_handler = parent_event->overflow_handler; |
Avi Kivity | 4dc0da8 | 2011-06-29 18:42:35 +0300 | [diff] [blame] | 7875 | context = parent_event->overflow_handler_context; |
| 7876 | } |
Oleg Nesterov | 66832eb | 2011-01-18 17:10:32 +0100 | [diff] [blame] | 7877 | |
Frederic Weisbecker | b326e95 | 2009-12-05 09:44:31 +0100 | [diff] [blame] | 7878 | event->overflow_handler = overflow_handler; |
Avi Kivity | 4dc0da8 | 2011-06-29 18:42:35 +0300 | [diff] [blame] | 7879 | event->overflow_handler_context = context; |
Frederic Weisbecker | 97eaf53 | 2009-10-18 15:33:50 +0200 | [diff] [blame] | 7880 | |
Jiri Olsa | 0231bb5 | 2013-02-01 11:23:45 +0100 | [diff] [blame] | 7881 | perf_event__state_init(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7882 | |
| 7883 | pmu = NULL; |
| 7884 | |
| 7885 | hwc = &event->hw; |
| 7886 | hwc->sample_period = attr->sample_period; |
| 7887 | if (attr->freq && attr->sample_freq) |
| 7888 | hwc->sample_period = 1; |
| 7889 | hwc->last_period = hwc->sample_period; |
| 7890 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 7891 | local64_set(&hwc->period_left, hwc->sample_period); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7892 | |
| 7893 | /* |
| 7894 | * we currently do not support PERF_FORMAT_GROUP on inherited events |
| 7895 | */ |
| 7896 | if (attr->inherit && (attr->read_format & PERF_FORMAT_GROUP)) |
Frederic Weisbecker | 90983b1 | 2013-07-23 02:31:00 +0200 | [diff] [blame] | 7897 | goto err_ns; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7898 | |
Yan, Zheng | a46a230 | 2014-11-04 21:56:06 -0500 | [diff] [blame] | 7899 | if (!has_branch_stack(event)) |
| 7900 | event->attr.branch_sample_type = 0; |
| 7901 | |
Matt Fleming | 79dff51 | 2015-01-23 18:45:42 +0000 | [diff] [blame] | 7902 | if (cgroup_fd != -1) { |
| 7903 | err = perf_cgroup_connect(cgroup_fd, event, attr, group_leader); |
| 7904 | if (err) |
| 7905 | goto err_ns; |
| 7906 | } |
| 7907 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 7908 | pmu = perf_init_event(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7909 | if (!pmu) |
Frederic Weisbecker | 90983b1 | 2013-07-23 02:31:00 +0200 | [diff] [blame] | 7910 | goto err_ns; |
| 7911 | else if (IS_ERR(pmu)) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7912 | err = PTR_ERR(pmu); |
Frederic Weisbecker | 90983b1 | 2013-07-23 02:31:00 +0200 | [diff] [blame] | 7913 | goto err_ns; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7914 | } |
| 7915 | |
Alexander Shishkin | bed5b25 | 2015-01-30 12:31:06 +0200 | [diff] [blame] | 7916 | err = exclusive_event_init(event); |
| 7917 | if (err) |
| 7918 | goto err_pmu; |
| 7919 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7920 | if (!event->parent) { |
Frederic Weisbecker | 927c7a9 | 2010-07-01 16:20:36 +0200 | [diff] [blame] | 7921 | if (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN) { |
| 7922 | err = get_callchain_buffers(); |
Frederic Weisbecker | 90983b1 | 2013-07-23 02:31:00 +0200 | [diff] [blame] | 7923 | if (err) |
Alexander Shishkin | bed5b25 | 2015-01-30 12:31:06 +0200 | [diff] [blame] | 7924 | goto err_per_task; |
Stephane Eranian | d010b33 | 2012-02-09 23:21:00 +0100 | [diff] [blame] | 7925 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7926 | } |
| 7927 | |
| 7928 | return event; |
Frederic Weisbecker | 90983b1 | 2013-07-23 02:31:00 +0200 | [diff] [blame] | 7929 | |
Alexander Shishkin | bed5b25 | 2015-01-30 12:31:06 +0200 | [diff] [blame] | 7930 | err_per_task: |
| 7931 | exclusive_event_destroy(event); |
| 7932 | |
Frederic Weisbecker | 90983b1 | 2013-07-23 02:31:00 +0200 | [diff] [blame] | 7933 | err_pmu: |
| 7934 | if (event->destroy) |
| 7935 | event->destroy(event); |
Yan, Zheng | c464c76 | 2014-03-18 16:56:41 +0800 | [diff] [blame] | 7936 | module_put(pmu->module); |
Frederic Weisbecker | 90983b1 | 2013-07-23 02:31:00 +0200 | [diff] [blame] | 7937 | err_ns: |
Matt Fleming | 79dff51 | 2015-01-23 18:45:42 +0000 | [diff] [blame] | 7938 | if (is_cgroup_event(event)) |
| 7939 | perf_detach_cgroup(event); |
Frederic Weisbecker | 90983b1 | 2013-07-23 02:31:00 +0200 | [diff] [blame] | 7940 | if (event->ns) |
| 7941 | put_pid_ns(event->ns); |
| 7942 | kfree(event); |
| 7943 | |
| 7944 | return ERR_PTR(err); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 7945 | } |
| 7946 | |
| 7947 | static int perf_copy_attr(struct perf_event_attr __user *uattr, |
| 7948 | struct perf_event_attr *attr) |
| 7949 | { |
| 7950 | u32 size; |
| 7951 | int ret; |
| 7952 | |
| 7953 | if (!access_ok(VERIFY_WRITE, uattr, PERF_ATTR_SIZE_VER0)) |
| 7954 | return -EFAULT; |
| 7955 | |
| 7956 | /* |
| 7957 | * zero the full structure, so that a short copy will be nice. |
| 7958 | */ |
| 7959 | memset(attr, 0, sizeof(*attr)); |
| 7960 | |
| 7961 | ret = get_user(size, &uattr->size); |
| 7962 | if (ret) |
| 7963 | return ret; |
| 7964 | |
| 7965 | if (size > PAGE_SIZE) /* silly large */ |
| 7966 | goto err_size; |
| 7967 | |
| 7968 | if (!size) /* abi compat */ |
| 7969 | size = PERF_ATTR_SIZE_VER0; |
| 7970 | |
| 7971 | if (size < PERF_ATTR_SIZE_VER0) |
| 7972 | goto err_size; |
| 7973 | |
| 7974 | /* |
| 7975 | * If we're handed a bigger struct than we know of, |
| 7976 | * ensure all the unknown bits are 0 - i.e. new |
| 7977 | * user-space does not rely on any kernel feature |
| 7978 | * extensions we dont know about yet. |
| 7979 | */ |
| 7980 | if (size > sizeof(*attr)) { |
| 7981 | unsigned char __user *addr; |
| 7982 | unsigned char __user *end; |
| 7983 | unsigned char val; |
| 7984 | |
| 7985 | addr = (void __user *)uattr + sizeof(*attr); |
| 7986 | end = (void __user *)uattr + size; |
| 7987 | |
| 7988 | for (; addr < end; addr++) { |
| 7989 | ret = get_user(val, addr); |
| 7990 | if (ret) |
| 7991 | return ret; |
| 7992 | if (val) |
| 7993 | goto err_size; |
| 7994 | } |
| 7995 | size = sizeof(*attr); |
| 7996 | } |
| 7997 | |
| 7998 | ret = copy_from_user(attr, uattr, size); |
| 7999 | if (ret) |
| 8000 | return -EFAULT; |
| 8001 | |
Mahesh Salgaonkar | cd75764 | 2010-01-30 10:25:18 +0530 | [diff] [blame] | 8002 | if (attr->__reserved_1) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8003 | return -EINVAL; |
| 8004 | |
| 8005 | if (attr->sample_type & ~(PERF_SAMPLE_MAX-1)) |
| 8006 | return -EINVAL; |
| 8007 | |
| 8008 | if (attr->read_format & ~(PERF_FORMAT_MAX-1)) |
| 8009 | return -EINVAL; |
| 8010 | |
Stephane Eranian | bce38cd | 2012-02-09 23:20:51 +0100 | [diff] [blame] | 8011 | if (attr->sample_type & PERF_SAMPLE_BRANCH_STACK) { |
| 8012 | u64 mask = attr->branch_sample_type; |
| 8013 | |
| 8014 | /* only using defined bits */ |
| 8015 | if (mask & ~(PERF_SAMPLE_BRANCH_MAX-1)) |
| 8016 | return -EINVAL; |
| 8017 | |
| 8018 | /* at least one branch bit must be set */ |
| 8019 | if (!(mask & ~PERF_SAMPLE_BRANCH_PLM_ALL)) |
| 8020 | return -EINVAL; |
| 8021 | |
Stephane Eranian | bce38cd | 2012-02-09 23:20:51 +0100 | [diff] [blame] | 8022 | /* propagate priv level, when not set for branch */ |
| 8023 | if (!(mask & PERF_SAMPLE_BRANCH_PLM_ALL)) { |
| 8024 | |
| 8025 | /* exclude_kernel checked on syscall entry */ |
| 8026 | if (!attr->exclude_kernel) |
| 8027 | mask |= PERF_SAMPLE_BRANCH_KERNEL; |
| 8028 | |
| 8029 | if (!attr->exclude_user) |
| 8030 | mask |= PERF_SAMPLE_BRANCH_USER; |
| 8031 | |
| 8032 | if (!attr->exclude_hv) |
| 8033 | mask |= PERF_SAMPLE_BRANCH_HV; |
| 8034 | /* |
| 8035 | * adjust user setting (for HW filter setup) |
| 8036 | */ |
| 8037 | attr->branch_sample_type = mask; |
| 8038 | } |
Stephane Eranian | e712209 | 2013-06-06 11:02:04 +0200 | [diff] [blame] | 8039 | /* privileged levels capture (kernel, hv): check permissions */ |
| 8040 | if ((mask & PERF_SAMPLE_BRANCH_PERM_PLM) |
Stephane Eranian | 2b923c8 | 2013-05-21 12:53:37 +0200 | [diff] [blame] | 8041 | && perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN)) |
| 8042 | return -EACCES; |
Stephane Eranian | bce38cd | 2012-02-09 23:20:51 +0100 | [diff] [blame] | 8043 | } |
Jiri Olsa | 4018994 | 2012-08-07 15:20:37 +0200 | [diff] [blame] | 8044 | |
Jiri Olsa | c5ebced | 2012-08-07 15:20:40 +0200 | [diff] [blame] | 8045 | if (attr->sample_type & PERF_SAMPLE_REGS_USER) { |
Jiri Olsa | 4018994 | 2012-08-07 15:20:37 +0200 | [diff] [blame] | 8046 | ret = perf_reg_validate(attr->sample_regs_user); |
Jiri Olsa | c5ebced | 2012-08-07 15:20:40 +0200 | [diff] [blame] | 8047 | if (ret) |
| 8048 | return ret; |
| 8049 | } |
| 8050 | |
| 8051 | if (attr->sample_type & PERF_SAMPLE_STACK_USER) { |
| 8052 | if (!arch_perf_have_user_stack_dump()) |
| 8053 | return -ENOSYS; |
| 8054 | |
| 8055 | /* |
| 8056 | * We have __u32 type for the size, but so far |
| 8057 | * we can only use __u16 as maximum due to the |
| 8058 | * __u16 sample size limit. |
| 8059 | */ |
| 8060 | if (attr->sample_stack_user >= USHRT_MAX) |
| 8061 | ret = -EINVAL; |
| 8062 | else if (!IS_ALIGNED(attr->sample_stack_user, sizeof(u64))) |
| 8063 | ret = -EINVAL; |
| 8064 | } |
Jiri Olsa | 4018994 | 2012-08-07 15:20:37 +0200 | [diff] [blame] | 8065 | |
Stephane Eranian | 60e2364 | 2014-09-24 13:48:37 +0200 | [diff] [blame] | 8066 | if (attr->sample_type & PERF_SAMPLE_REGS_INTR) |
| 8067 | ret = perf_reg_validate(attr->sample_regs_intr); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8068 | out: |
| 8069 | return ret; |
| 8070 | |
| 8071 | err_size: |
| 8072 | put_user(sizeof(*attr), &uattr->size); |
| 8073 | ret = -E2BIG; |
| 8074 | goto out; |
| 8075 | } |
| 8076 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 8077 | static int |
| 8078 | perf_event_set_output(struct perf_event *event, struct perf_event *output_event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8079 | { |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 8080 | struct ring_buffer *rb = NULL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8081 | int ret = -EINVAL; |
| 8082 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 8083 | if (!output_event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8084 | goto set; |
| 8085 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 8086 | /* don't allow circular references */ |
| 8087 | if (event == output_event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8088 | goto out; |
| 8089 | |
Peter Zijlstra | 0f13930 | 2010-05-20 14:35:15 +0200 | [diff] [blame] | 8090 | /* |
| 8091 | * Don't allow cross-cpu buffers |
| 8092 | */ |
| 8093 | if (output_event->cpu != event->cpu) |
| 8094 | goto out; |
| 8095 | |
| 8096 | /* |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 8097 | * If its not a per-cpu rb, it must be the same task. |
Peter Zijlstra | 0f13930 | 2010-05-20 14:35:15 +0200 | [diff] [blame] | 8098 | */ |
| 8099 | if (output_event->cpu == -1 && output_event->ctx != event->ctx) |
| 8100 | goto out; |
| 8101 | |
Peter Zijlstra | 34f4392 | 2015-02-20 14:05:38 +0100 | [diff] [blame] | 8102 | /* |
| 8103 | * Mixing clocks in the same buffer is trouble you don't need. |
| 8104 | */ |
| 8105 | if (output_event->clock != event->clock) |
| 8106 | goto out; |
| 8107 | |
Peter Zijlstra | 45bfb2e | 2015-01-14 14:18:11 +0200 | [diff] [blame] | 8108 | /* |
| 8109 | * If both events generate aux data, they must be on the same PMU |
| 8110 | */ |
| 8111 | if (has_aux(event) && has_aux(output_event) && |
| 8112 | event->pmu != output_event->pmu) |
| 8113 | goto out; |
| 8114 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8115 | set: |
| 8116 | mutex_lock(&event->mmap_mutex); |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 8117 | /* Can't redirect output if we've got an active mmap() */ |
| 8118 | if (atomic_read(&event->mmap_count)) |
| 8119 | goto unlock; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8120 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 8121 | if (output_event) { |
Frederic Weisbecker | 7636913 | 2011-05-19 19:55:04 +0200 | [diff] [blame] | 8122 | /* get the rb we want to redirect to */ |
| 8123 | rb = ring_buffer_get(output_event); |
| 8124 | if (!rb) |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 8125 | goto unlock; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8126 | } |
| 8127 | |
Peter Zijlstra | b69cf53 | 2014-03-14 10:50:33 +0100 | [diff] [blame] | 8128 | ring_buffer_attach(event, rb); |
Peter Zijlstra | 9bb5d40 | 2013-06-04 10:44:21 +0200 | [diff] [blame] | 8129 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8130 | ret = 0; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 8131 | unlock: |
| 8132 | mutex_unlock(&event->mmap_mutex); |
| 8133 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8134 | out: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8135 | return ret; |
| 8136 | } |
| 8137 | |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 8138 | static void mutex_lock_double(struct mutex *a, struct mutex *b) |
| 8139 | { |
| 8140 | if (b < a) |
| 8141 | swap(a, b); |
| 8142 | |
| 8143 | mutex_lock(a); |
| 8144 | mutex_lock_nested(b, SINGLE_DEPTH_NESTING); |
| 8145 | } |
| 8146 | |
Peter Zijlstra | 34f4392 | 2015-02-20 14:05:38 +0100 | [diff] [blame] | 8147 | static int perf_event_set_clock(struct perf_event *event, clockid_t clk_id) |
| 8148 | { |
| 8149 | bool nmi_safe = false; |
| 8150 | |
| 8151 | switch (clk_id) { |
| 8152 | case CLOCK_MONOTONIC: |
| 8153 | event->clock = &ktime_get_mono_fast_ns; |
| 8154 | nmi_safe = true; |
| 8155 | break; |
| 8156 | |
| 8157 | case CLOCK_MONOTONIC_RAW: |
| 8158 | event->clock = &ktime_get_raw_fast_ns; |
| 8159 | nmi_safe = true; |
| 8160 | break; |
| 8161 | |
| 8162 | case CLOCK_REALTIME: |
| 8163 | event->clock = &ktime_get_real_ns; |
| 8164 | break; |
| 8165 | |
| 8166 | case CLOCK_BOOTTIME: |
| 8167 | event->clock = &ktime_get_boot_ns; |
| 8168 | break; |
| 8169 | |
| 8170 | case CLOCK_TAI: |
| 8171 | event->clock = &ktime_get_tai_ns; |
| 8172 | break; |
| 8173 | |
| 8174 | default: |
| 8175 | return -EINVAL; |
| 8176 | } |
| 8177 | |
| 8178 | if (!nmi_safe && !(event->pmu->capabilities & PERF_PMU_CAP_NO_NMI)) |
| 8179 | return -EINVAL; |
| 8180 | |
| 8181 | return 0; |
| 8182 | } |
| 8183 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8184 | /** |
| 8185 | * sys_perf_event_open - open a performance event, associate it to a task/cpu |
| 8186 | * |
| 8187 | * @attr_uptr: event_id type attributes for monitoring/sampling |
| 8188 | * @pid: target pid |
| 8189 | * @cpu: target cpu |
| 8190 | * @group_fd: group leader event fd |
| 8191 | */ |
| 8192 | SYSCALL_DEFINE5(perf_event_open, |
| 8193 | struct perf_event_attr __user *, attr_uptr, |
| 8194 | pid_t, pid, int, cpu, int, group_fd, unsigned long, flags) |
| 8195 | { |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 8196 | struct perf_event *group_leader = NULL, *output_event = NULL; |
| 8197 | struct perf_event *event, *sibling; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8198 | struct perf_event_attr attr; |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 8199 | struct perf_event_context *ctx, *uninitialized_var(gctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8200 | struct file *event_file = NULL; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 8201 | struct fd group = {NULL, 0}; |
Matt Helsley | 38a81da | 2010-09-13 13:01:20 -0700 | [diff] [blame] | 8202 | struct task_struct *task = NULL; |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 8203 | struct pmu *pmu; |
Al Viro | ea635c6 | 2010-05-26 17:40:29 -0400 | [diff] [blame] | 8204 | int event_fd; |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 8205 | int move_group = 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8206 | int err; |
Yann Droneaud | a21b0b3 | 2014-01-05 21:36:33 +0100 | [diff] [blame] | 8207 | int f_flags = O_RDWR; |
Matt Fleming | 79dff51 | 2015-01-23 18:45:42 +0000 | [diff] [blame] | 8208 | int cgroup_fd = -1; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8209 | |
| 8210 | /* for future expandability... */ |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 8211 | if (flags & ~PERF_FLAG_ALL) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8212 | return -EINVAL; |
| 8213 | |
| 8214 | err = perf_copy_attr(attr_uptr, &attr); |
| 8215 | if (err) |
| 8216 | return err; |
| 8217 | |
| 8218 | if (!attr.exclude_kernel) { |
| 8219 | if (perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN)) |
| 8220 | return -EACCES; |
| 8221 | } |
| 8222 | |
| 8223 | if (attr.freq) { |
| 8224 | if (attr.sample_freq > sysctl_perf_event_sample_rate) |
| 8225 | return -EINVAL; |
Peter Zijlstra | 0819b2e | 2014-05-15 20:23:48 +0200 | [diff] [blame] | 8226 | } else { |
| 8227 | if (attr.sample_period & (1ULL << 63)) |
| 8228 | return -EINVAL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8229 | } |
| 8230 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 8231 | /* |
| 8232 | * In cgroup mode, the pid argument is used to pass the fd |
| 8233 | * opened to the cgroup directory in cgroupfs. The cpu argument |
| 8234 | * designates the cpu on which to monitor threads from that |
| 8235 | * cgroup. |
| 8236 | */ |
| 8237 | if ((flags & PERF_FLAG_PID_CGROUP) && (pid == -1 || cpu == -1)) |
| 8238 | return -EINVAL; |
| 8239 | |
Yann Droneaud | a21b0b3 | 2014-01-05 21:36:33 +0100 | [diff] [blame] | 8240 | if (flags & PERF_FLAG_FD_CLOEXEC) |
| 8241 | f_flags |= O_CLOEXEC; |
| 8242 | |
| 8243 | event_fd = get_unused_fd_flags(f_flags); |
Al Viro | ea635c6 | 2010-05-26 17:40:29 -0400 | [diff] [blame] | 8244 | if (event_fd < 0) |
| 8245 | return event_fd; |
| 8246 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 8247 | if (group_fd != -1) { |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 8248 | err = perf_fget_light(group_fd, &group); |
| 8249 | if (err) |
Stephane Eranian | d14b12d | 2010-09-17 11:28:47 +0200 | [diff] [blame] | 8250 | goto err_fd; |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 8251 | group_leader = group.file->private_data; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 8252 | if (flags & PERF_FLAG_FD_OUTPUT) |
| 8253 | output_event = group_leader; |
| 8254 | if (flags & PERF_FLAG_FD_NO_GROUP) |
| 8255 | group_leader = NULL; |
| 8256 | } |
| 8257 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 8258 | if (pid != -1 && !(flags & PERF_FLAG_PID_CGROUP)) { |
Peter Zijlstra | c6be5a5 | 2010-10-14 16:59:46 +0200 | [diff] [blame] | 8259 | task = find_lively_task_by_vpid(pid); |
| 8260 | if (IS_ERR(task)) { |
| 8261 | err = PTR_ERR(task); |
| 8262 | goto err_group_fd; |
| 8263 | } |
| 8264 | } |
| 8265 | |
Peter Zijlstra | 1f4ee50 | 2014-05-06 09:59:34 +0200 | [diff] [blame] | 8266 | if (task && group_leader && |
| 8267 | group_leader->attr.inherit != attr.inherit) { |
| 8268 | err = -EINVAL; |
| 8269 | goto err_task; |
| 8270 | } |
| 8271 | |
Yan, Zheng | fbfc623 | 2012-06-15 14:31:31 +0800 | [diff] [blame] | 8272 | get_online_cpus(); |
| 8273 | |
Matt Fleming | 79dff51 | 2015-01-23 18:45:42 +0000 | [diff] [blame] | 8274 | if (flags & PERF_FLAG_PID_CGROUP) |
| 8275 | cgroup_fd = pid; |
| 8276 | |
Avi Kivity | 4dc0da8 | 2011-06-29 18:42:35 +0300 | [diff] [blame] | 8277 | event = perf_event_alloc(&attr, cpu, task, group_leader, NULL, |
Matt Fleming | 79dff51 | 2015-01-23 18:45:42 +0000 | [diff] [blame] | 8278 | NULL, NULL, cgroup_fd); |
Stephane Eranian | d14b12d | 2010-09-17 11:28:47 +0200 | [diff] [blame] | 8279 | if (IS_ERR(event)) { |
| 8280 | err = PTR_ERR(event); |
Peter Zijlstra | 1f4ee50 | 2014-05-06 09:59:34 +0200 | [diff] [blame] | 8281 | goto err_cpus; |
Stephane Eranian | d14b12d | 2010-09-17 11:28:47 +0200 | [diff] [blame] | 8282 | } |
| 8283 | |
Vince Weaver | 53b2533 | 2014-05-16 17:12:12 -0400 | [diff] [blame] | 8284 | if (is_sampling_event(event)) { |
| 8285 | if (event->pmu->capabilities & PERF_PMU_CAP_NO_INTERRUPT) { |
| 8286 | err = -ENOTSUPP; |
| 8287 | goto err_alloc; |
| 8288 | } |
| 8289 | } |
| 8290 | |
Frederic Weisbecker | 766d6c0 | 2013-07-23 02:31:01 +0200 | [diff] [blame] | 8291 | account_event(event); |
| 8292 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8293 | /* |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 8294 | * Special case software events and allow them to be part of |
| 8295 | * any hardware group. |
| 8296 | */ |
| 8297 | pmu = event->pmu; |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 8298 | |
Peter Zijlstra | 34f4392 | 2015-02-20 14:05:38 +0100 | [diff] [blame] | 8299 | if (attr.use_clockid) { |
| 8300 | err = perf_event_set_clock(event, attr.clockid); |
| 8301 | if (err) |
| 8302 | goto err_alloc; |
| 8303 | } |
| 8304 | |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 8305 | if (group_leader && |
| 8306 | (is_software_event(event) != is_software_event(group_leader))) { |
| 8307 | if (is_software_event(event)) { |
| 8308 | /* |
| 8309 | * If event and group_leader are not both a software |
| 8310 | * event, and event is, then group leader is not. |
| 8311 | * |
| 8312 | * Allow the addition of software events to !software |
| 8313 | * groups, this is safe because software events never |
| 8314 | * fail to schedule. |
| 8315 | */ |
| 8316 | pmu = group_leader->pmu; |
| 8317 | } else if (is_software_event(group_leader) && |
| 8318 | (group_leader->group_flags & PERF_GROUP_SOFTWARE)) { |
| 8319 | /* |
| 8320 | * In case the group is a pure software group, and we |
| 8321 | * try to add a hardware event, move the whole group to |
| 8322 | * the hardware context. |
| 8323 | */ |
| 8324 | move_group = 1; |
| 8325 | } |
| 8326 | } |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 8327 | |
| 8328 | /* |
| 8329 | * Get the target context (task or percpu): |
| 8330 | */ |
Yan, Zheng | 4af57ef28 | 2014-11-04 21:56:01 -0500 | [diff] [blame] | 8331 | ctx = find_get_context(pmu, task, event); |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 8332 | if (IS_ERR(ctx)) { |
| 8333 | err = PTR_ERR(ctx); |
Peter Zijlstra | c6be5a5 | 2010-10-14 16:59:46 +0200 | [diff] [blame] | 8334 | goto err_alloc; |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 8335 | } |
| 8336 | |
Alexander Shishkin | bed5b25 | 2015-01-30 12:31:06 +0200 | [diff] [blame] | 8337 | if ((pmu->capabilities & PERF_PMU_CAP_EXCLUSIVE) && group_leader) { |
| 8338 | err = -EBUSY; |
| 8339 | goto err_context; |
| 8340 | } |
| 8341 | |
Peter Zijlstra | fd1edb3 | 2011-03-28 13:13:56 +0200 | [diff] [blame] | 8342 | if (task) { |
| 8343 | put_task_struct(task); |
| 8344 | task = NULL; |
| 8345 | } |
| 8346 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8347 | /* |
| 8348 | * Look up the group leader (we will attach this event to it): |
| 8349 | */ |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 8350 | if (group_leader) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8351 | err = -EINVAL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8352 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8353 | /* |
| 8354 | * Do not allow a recursive hierarchy (this new sibling |
| 8355 | * becoming part of another group-sibling): |
| 8356 | */ |
| 8357 | if (group_leader->group_leader != group_leader) |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 8358 | goto err_context; |
Peter Zijlstra | 34f4392 | 2015-02-20 14:05:38 +0100 | [diff] [blame] | 8359 | |
| 8360 | /* All events in a group should have the same clock */ |
| 8361 | if (group_leader->clock != event->clock) |
| 8362 | goto err_context; |
| 8363 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8364 | /* |
| 8365 | * Do not allow to attach to a group in a different |
| 8366 | * task or CPU context: |
| 8367 | */ |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 8368 | if (move_group) { |
Peter Zijlstra | c3c87e7 | 2015-01-23 11:19:48 +0100 | [diff] [blame] | 8369 | /* |
| 8370 | * Make sure we're both on the same task, or both |
| 8371 | * per-cpu events. |
| 8372 | */ |
| 8373 | if (group_leader->ctx->task != ctx->task) |
| 8374 | goto err_context; |
| 8375 | |
| 8376 | /* |
| 8377 | * Make sure we're both events for the same CPU; |
| 8378 | * grouping events for different CPUs is broken; since |
| 8379 | * you can never concurrently schedule them anyhow. |
| 8380 | */ |
| 8381 | if (group_leader->cpu != event->cpu) |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 8382 | goto err_context; |
| 8383 | } else { |
| 8384 | if (group_leader->ctx != ctx) |
| 8385 | goto err_context; |
| 8386 | } |
| 8387 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8388 | /* |
| 8389 | * Only a group leader can be exclusive or pinned |
| 8390 | */ |
| 8391 | if (attr.exclusive || attr.pinned) |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 8392 | goto err_context; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 8393 | } |
| 8394 | |
| 8395 | if (output_event) { |
| 8396 | err = perf_event_set_output(event, output_event); |
| 8397 | if (err) |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 8398 | goto err_context; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 8399 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8400 | |
Yann Droneaud | a21b0b3 | 2014-01-05 21:36:33 +0100 | [diff] [blame] | 8401 | event_file = anon_inode_getfile("[perf_event]", &perf_fops, event, |
| 8402 | f_flags); |
Al Viro | ea635c6 | 2010-05-26 17:40:29 -0400 | [diff] [blame] | 8403 | if (IS_ERR(event_file)) { |
| 8404 | err = PTR_ERR(event_file); |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 8405 | goto err_context; |
Al Viro | ea635c6 | 2010-05-26 17:40:29 -0400 | [diff] [blame] | 8406 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8407 | |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 8408 | if (move_group) { |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 8409 | gctx = group_leader->ctx; |
Peter Zijlstra | f55fc2a | 2015-09-09 19:06:33 +0200 | [diff] [blame] | 8410 | mutex_lock_double(&gctx->mutex, &ctx->mutex); |
| 8411 | } else { |
| 8412 | mutex_lock(&ctx->mutex); |
| 8413 | } |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 8414 | |
Peter Zijlstra | a723968 | 2015-09-09 19:06:33 +0200 | [diff] [blame] | 8415 | if (!perf_event_validate_size(event)) { |
| 8416 | err = -E2BIG; |
| 8417 | goto err_locked; |
| 8418 | } |
| 8419 | |
Peter Zijlstra | f55fc2a | 2015-09-09 19:06:33 +0200 | [diff] [blame] | 8420 | /* |
| 8421 | * Must be under the same ctx::mutex as perf_install_in_context(), |
| 8422 | * because we need to serialize with concurrent event creation. |
| 8423 | */ |
| 8424 | if (!exclusive_event_installable(event, ctx)) { |
| 8425 | /* exclusive and group stuff are assumed mutually exclusive */ |
| 8426 | WARN_ON_ONCE(move_group); |
| 8427 | |
| 8428 | err = -EBUSY; |
| 8429 | goto err_locked; |
| 8430 | } |
| 8431 | |
| 8432 | WARN_ON_ONCE(ctx->parent_ctx); |
| 8433 | |
| 8434 | if (move_group) { |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 8435 | /* |
| 8436 | * See perf_event_ctx_lock() for comments on the details |
| 8437 | * of swizzling perf_event::ctx. |
| 8438 | */ |
Peter Zijlstra | 46ce0fe | 2014-05-02 16:56:01 +0200 | [diff] [blame] | 8439 | perf_remove_from_context(group_leader, false); |
Jiri Olsa | 0231bb5 | 2013-02-01 11:23:45 +0100 | [diff] [blame] | 8440 | |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 8441 | list_for_each_entry(sibling, &group_leader->sibling_list, |
| 8442 | group_entry) { |
Peter Zijlstra | 46ce0fe | 2014-05-02 16:56:01 +0200 | [diff] [blame] | 8443 | perf_remove_from_context(sibling, false); |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 8444 | put_ctx(gctx); |
| 8445 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8446 | |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 8447 | /* |
| 8448 | * Wait for everybody to stop referencing the events through |
| 8449 | * the old lists, before installing it on new lists. |
| 8450 | */ |
Yan, Zheng | 0cda4c0 | 2012-06-15 14:31:33 +0800 | [diff] [blame] | 8451 | synchronize_rcu(); |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 8452 | |
Peter Zijlstra (Intel) | 8f95b43 | 2015-01-27 11:53:12 +0100 | [diff] [blame] | 8453 | /* |
| 8454 | * Install the group siblings before the group leader. |
| 8455 | * |
| 8456 | * Because a group leader will try and install the entire group |
| 8457 | * (through the sibling list, which is still in-tact), we can |
| 8458 | * end up with siblings installed in the wrong context. |
| 8459 | * |
| 8460 | * By installing siblings first we NO-OP because they're not |
| 8461 | * reachable through the group lists. |
| 8462 | */ |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 8463 | list_for_each_entry(sibling, &group_leader->sibling_list, |
| 8464 | group_entry) { |
Peter Zijlstra (Intel) | 8f95b43 | 2015-01-27 11:53:12 +0100 | [diff] [blame] | 8465 | perf_event__state_init(sibling); |
Jiri Olsa | 9fc81d8 | 2014-12-10 21:23:51 +0100 | [diff] [blame] | 8466 | perf_install_in_context(ctx, sibling, sibling->cpu); |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 8467 | get_ctx(ctx); |
| 8468 | } |
Peter Zijlstra (Intel) | 8f95b43 | 2015-01-27 11:53:12 +0100 | [diff] [blame] | 8469 | |
| 8470 | /* |
| 8471 | * Removing from the context ends up with disabled |
| 8472 | * event. What we want here is event in the initial |
| 8473 | * startup state, ready to be add into new context. |
| 8474 | */ |
| 8475 | perf_event__state_init(group_leader); |
| 8476 | perf_install_in_context(ctx, group_leader, group_leader->cpu); |
| 8477 | get_ctx(ctx); |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 8478 | |
Peter Zijlstra | f55fc2a | 2015-09-09 19:06:33 +0200 | [diff] [blame] | 8479 | /* |
| 8480 | * Now that all events are installed in @ctx, nothing |
| 8481 | * references @gctx anymore, so drop the last reference we have |
| 8482 | * on it. |
| 8483 | */ |
| 8484 | put_ctx(gctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8485 | } |
| 8486 | |
Peter Zijlstra | f73e22a | 2015-09-09 20:48:22 +0200 | [diff] [blame] | 8487 | /* |
| 8488 | * Precalculate sample_data sizes; do while holding ctx::mutex such |
| 8489 | * that we're serialized against further additions and before |
| 8490 | * perf_install_in_context() which is the point the event is active and |
| 8491 | * can use these values. |
| 8492 | */ |
| 8493 | perf_event__header_size(event); |
| 8494 | perf_event__id_header_size(event); |
Alexander Shishkin | bed5b25 | 2015-01-30 12:31:06 +0200 | [diff] [blame] | 8495 | |
Yan, Zheng | e2d37cd | 2012-06-15 14:31:32 +0800 | [diff] [blame] | 8496 | perf_install_in_context(ctx, event, event->cpu); |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 8497 | perf_unpin_context(ctx); |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 8498 | |
Peter Zijlstra | f55fc2a | 2015-09-09 19:06:33 +0200 | [diff] [blame] | 8499 | if (move_group) |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 8500 | mutex_unlock(&gctx->mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8501 | mutex_unlock(&ctx->mutex); |
| 8502 | |
Yan, Zheng | fbfc623 | 2012-06-15 14:31:31 +0800 | [diff] [blame] | 8503 | put_online_cpus(); |
| 8504 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8505 | event->owner = current; |
Peter Zijlstra | 8882135 | 2010-11-09 19:01:43 +0100 | [diff] [blame] | 8506 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8507 | mutex_lock(¤t->perf_event_mutex); |
| 8508 | list_add_tail(&event->owner_entry, ¤t->perf_event_list); |
| 8509 | mutex_unlock(¤t->perf_event_mutex); |
| 8510 | |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 8511 | /* |
| 8512 | * Drop the reference on the group_event after placing the |
| 8513 | * new event on the sibling_list. This ensures destruction |
| 8514 | * of the group leader will find the pointer to itself in |
| 8515 | * perf_group_detach(). |
| 8516 | */ |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 8517 | fdput(group); |
Al Viro | ea635c6 | 2010-05-26 17:40:29 -0400 | [diff] [blame] | 8518 | fd_install(event_fd, event_file); |
| 8519 | return event_fd; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8520 | |
Peter Zijlstra | f55fc2a | 2015-09-09 19:06:33 +0200 | [diff] [blame] | 8521 | err_locked: |
| 8522 | if (move_group) |
| 8523 | mutex_unlock(&gctx->mutex); |
| 8524 | mutex_unlock(&ctx->mutex); |
| 8525 | /* err_file: */ |
| 8526 | fput(event_file); |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 8527 | err_context: |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 8528 | perf_unpin_context(ctx); |
Al Viro | ea635c6 | 2010-05-26 17:40:29 -0400 | [diff] [blame] | 8529 | put_ctx(ctx); |
Peter Zijlstra | c6be5a5 | 2010-10-14 16:59:46 +0200 | [diff] [blame] | 8530 | err_alloc: |
| 8531 | free_event(event); |
Peter Zijlstra | 1f4ee50 | 2014-05-06 09:59:34 +0200 | [diff] [blame] | 8532 | err_cpus: |
Yan, Zheng | fbfc623 | 2012-06-15 14:31:31 +0800 | [diff] [blame] | 8533 | put_online_cpus(); |
Peter Zijlstra | 1f4ee50 | 2014-05-06 09:59:34 +0200 | [diff] [blame] | 8534 | err_task: |
Peter Zijlstra | e7d0bc0 | 2010-10-14 16:54:51 +0200 | [diff] [blame] | 8535 | if (task) |
| 8536 | put_task_struct(task); |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 8537 | err_group_fd: |
Al Viro | 2903ff0 | 2012-08-28 12:52:22 -0400 | [diff] [blame] | 8538 | fdput(group); |
Al Viro | ea635c6 | 2010-05-26 17:40:29 -0400 | [diff] [blame] | 8539 | err_fd: |
| 8540 | put_unused_fd(event_fd); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8541 | return err; |
| 8542 | } |
| 8543 | |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 8544 | /** |
| 8545 | * perf_event_create_kernel_counter |
| 8546 | * |
| 8547 | * @attr: attributes of the counter to create |
| 8548 | * @cpu: cpu in which the counter is bound |
Matt Helsley | 38a81da | 2010-09-13 13:01:20 -0700 | [diff] [blame] | 8549 | * @task: task to profile (NULL for percpu) |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 8550 | */ |
| 8551 | struct perf_event * |
| 8552 | perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu, |
Matt Helsley | 38a81da | 2010-09-13 13:01:20 -0700 | [diff] [blame] | 8553 | struct task_struct *task, |
Avi Kivity | 4dc0da8 | 2011-06-29 18:42:35 +0300 | [diff] [blame] | 8554 | perf_overflow_handler_t overflow_handler, |
| 8555 | void *context) |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 8556 | { |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 8557 | struct perf_event_context *ctx; |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 8558 | struct perf_event *event; |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 8559 | int err; |
| 8560 | |
| 8561 | /* |
| 8562 | * Get the target context (task or percpu): |
| 8563 | */ |
| 8564 | |
Avi Kivity | 4dc0da8 | 2011-06-29 18:42:35 +0300 | [diff] [blame] | 8565 | event = perf_event_alloc(attr, cpu, task, NULL, NULL, |
Matt Fleming | 79dff51 | 2015-01-23 18:45:42 +0000 | [diff] [blame] | 8566 | overflow_handler, context, -1); |
Frederic Weisbecker | c6567f6 | 2009-11-26 05:35:41 +0100 | [diff] [blame] | 8567 | if (IS_ERR(event)) { |
| 8568 | err = PTR_ERR(event); |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 8569 | goto err; |
| 8570 | } |
| 8571 | |
Jiri Olsa | f869776 | 2014-08-01 14:33:01 +0200 | [diff] [blame] | 8572 | /* Mark owner so we could distinguish it from user events. */ |
| 8573 | event->owner = EVENT_OWNER_KERNEL; |
| 8574 | |
Frederic Weisbecker | 766d6c0 | 2013-07-23 02:31:01 +0200 | [diff] [blame] | 8575 | account_event(event); |
| 8576 | |
Yan, Zheng | 4af57ef28 | 2014-11-04 21:56:01 -0500 | [diff] [blame] | 8577 | ctx = find_get_context(event->pmu, task, event); |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 8578 | if (IS_ERR(ctx)) { |
| 8579 | err = PTR_ERR(ctx); |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 8580 | goto err_free; |
Frederic Weisbecker | c6567f6 | 2009-11-26 05:35:41 +0100 | [diff] [blame] | 8581 | } |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 8582 | |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 8583 | WARN_ON_ONCE(ctx->parent_ctx); |
| 8584 | mutex_lock(&ctx->mutex); |
Alexander Shishkin | bed5b25 | 2015-01-30 12:31:06 +0200 | [diff] [blame] | 8585 | if (!exclusive_event_installable(event, ctx)) { |
| 8586 | mutex_unlock(&ctx->mutex); |
| 8587 | perf_unpin_context(ctx); |
| 8588 | put_ctx(ctx); |
| 8589 | err = -EBUSY; |
| 8590 | goto err_free; |
| 8591 | } |
| 8592 | |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 8593 | perf_install_in_context(ctx, event, cpu); |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 8594 | perf_unpin_context(ctx); |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 8595 | mutex_unlock(&ctx->mutex); |
| 8596 | |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 8597 | return event; |
| 8598 | |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 8599 | err_free: |
| 8600 | free_event(event); |
| 8601 | err: |
Frederic Weisbecker | c6567f6 | 2009-11-26 05:35:41 +0100 | [diff] [blame] | 8602 | return ERR_PTR(err); |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 8603 | } |
| 8604 | EXPORT_SYMBOL_GPL(perf_event_create_kernel_counter); |
| 8605 | |
Yan, Zheng | 0cda4c0 | 2012-06-15 14:31:33 +0800 | [diff] [blame] | 8606 | void perf_pmu_migrate_context(struct pmu *pmu, int src_cpu, int dst_cpu) |
| 8607 | { |
| 8608 | struct perf_event_context *src_ctx; |
| 8609 | struct perf_event_context *dst_ctx; |
| 8610 | struct perf_event *event, *tmp; |
| 8611 | LIST_HEAD(events); |
| 8612 | |
| 8613 | src_ctx = &per_cpu_ptr(pmu->pmu_cpu_context, src_cpu)->ctx; |
| 8614 | dst_ctx = &per_cpu_ptr(pmu->pmu_cpu_context, dst_cpu)->ctx; |
| 8615 | |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 8616 | /* |
| 8617 | * See perf_event_ctx_lock() for comments on the details |
| 8618 | * of swizzling perf_event::ctx. |
| 8619 | */ |
| 8620 | mutex_lock_double(&src_ctx->mutex, &dst_ctx->mutex); |
Yan, Zheng | 0cda4c0 | 2012-06-15 14:31:33 +0800 | [diff] [blame] | 8621 | list_for_each_entry_safe(event, tmp, &src_ctx->event_list, |
| 8622 | event_entry) { |
Peter Zijlstra | 46ce0fe | 2014-05-02 16:56:01 +0200 | [diff] [blame] | 8623 | perf_remove_from_context(event, false); |
Frederic Weisbecker | 9a545de | 2013-07-23 02:31:03 +0200 | [diff] [blame] | 8624 | unaccount_event_cpu(event, src_cpu); |
Yan, Zheng | 0cda4c0 | 2012-06-15 14:31:33 +0800 | [diff] [blame] | 8625 | put_ctx(src_ctx); |
Peter Zijlstra | 9886167 | 2013-10-03 16:02:23 +0200 | [diff] [blame] | 8626 | list_add(&event->migrate_entry, &events); |
Yan, Zheng | 0cda4c0 | 2012-06-15 14:31:33 +0800 | [diff] [blame] | 8627 | } |
Yan, Zheng | 0cda4c0 | 2012-06-15 14:31:33 +0800 | [diff] [blame] | 8628 | |
Peter Zijlstra (Intel) | 8f95b43 | 2015-01-27 11:53:12 +0100 | [diff] [blame] | 8629 | /* |
| 8630 | * Wait for the events to quiesce before re-instating them. |
| 8631 | */ |
Yan, Zheng | 0cda4c0 | 2012-06-15 14:31:33 +0800 | [diff] [blame] | 8632 | synchronize_rcu(); |
| 8633 | |
Peter Zijlstra (Intel) | 8f95b43 | 2015-01-27 11:53:12 +0100 | [diff] [blame] | 8634 | /* |
| 8635 | * Re-instate events in 2 passes. |
| 8636 | * |
| 8637 | * Skip over group leaders and only install siblings on this first |
| 8638 | * pass, siblings will not get enabled without a leader, however a |
| 8639 | * leader will enable its siblings, even if those are still on the old |
| 8640 | * context. |
| 8641 | */ |
| 8642 | list_for_each_entry_safe(event, tmp, &events, migrate_entry) { |
| 8643 | if (event->group_leader == event) |
| 8644 | continue; |
| 8645 | |
| 8646 | list_del(&event->migrate_entry); |
| 8647 | if (event->state >= PERF_EVENT_STATE_OFF) |
| 8648 | event->state = PERF_EVENT_STATE_INACTIVE; |
| 8649 | account_event_cpu(event, dst_cpu); |
| 8650 | perf_install_in_context(dst_ctx, event, dst_cpu); |
| 8651 | get_ctx(dst_ctx); |
| 8652 | } |
| 8653 | |
| 8654 | /* |
| 8655 | * Once all the siblings are setup properly, install the group leaders |
| 8656 | * to make it go. |
| 8657 | */ |
Peter Zijlstra | 9886167 | 2013-10-03 16:02:23 +0200 | [diff] [blame] | 8658 | list_for_each_entry_safe(event, tmp, &events, migrate_entry) { |
| 8659 | list_del(&event->migrate_entry); |
Yan, Zheng | 0cda4c0 | 2012-06-15 14:31:33 +0800 | [diff] [blame] | 8660 | if (event->state >= PERF_EVENT_STATE_OFF) |
| 8661 | event->state = PERF_EVENT_STATE_INACTIVE; |
Frederic Weisbecker | 9a545de | 2013-07-23 02:31:03 +0200 | [diff] [blame] | 8662 | account_event_cpu(event, dst_cpu); |
Yan, Zheng | 0cda4c0 | 2012-06-15 14:31:33 +0800 | [diff] [blame] | 8663 | perf_install_in_context(dst_ctx, event, dst_cpu); |
| 8664 | get_ctx(dst_ctx); |
| 8665 | } |
| 8666 | mutex_unlock(&dst_ctx->mutex); |
Peter Zijlstra | f63a8da | 2015-01-23 12:24:14 +0100 | [diff] [blame] | 8667 | mutex_unlock(&src_ctx->mutex); |
Yan, Zheng | 0cda4c0 | 2012-06-15 14:31:33 +0800 | [diff] [blame] | 8668 | } |
| 8669 | EXPORT_SYMBOL_GPL(perf_pmu_migrate_context); |
| 8670 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8671 | static void sync_child_event(struct perf_event *child_event, |
| 8672 | struct task_struct *child) |
| 8673 | { |
| 8674 | struct perf_event *parent_event = child_event->parent; |
| 8675 | u64 child_val; |
| 8676 | |
| 8677 | if (child_event->attr.inherit_stat) |
| 8678 | perf_event_read_event(child_event, child); |
| 8679 | |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 8680 | child_val = perf_event_count(child_event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8681 | |
| 8682 | /* |
| 8683 | * Add back the child's count to the parent's count: |
| 8684 | */ |
Peter Zijlstra | a6e6dea | 2010-05-21 14:27:58 +0200 | [diff] [blame] | 8685 | atomic64_add(child_val, &parent_event->child_count); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8686 | atomic64_add(child_event->total_time_enabled, |
| 8687 | &parent_event->child_total_time_enabled); |
| 8688 | atomic64_add(child_event->total_time_running, |
| 8689 | &parent_event->child_total_time_running); |
| 8690 | |
| 8691 | /* |
| 8692 | * Remove this event from the parent's list |
| 8693 | */ |
| 8694 | WARN_ON_ONCE(parent_event->ctx->parent_ctx); |
| 8695 | mutex_lock(&parent_event->child_mutex); |
| 8696 | list_del_init(&child_event->child_list); |
| 8697 | mutex_unlock(&parent_event->child_mutex); |
| 8698 | |
| 8699 | /* |
Jiri Olsa | dc63398 | 2014-09-12 13:18:26 +0200 | [diff] [blame] | 8700 | * Make sure user/parent get notified, that we just |
| 8701 | * lost one event. |
| 8702 | */ |
| 8703 | perf_event_wakeup(parent_event); |
| 8704 | |
| 8705 | /* |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8706 | * Release the parent event, if this was the last |
| 8707 | * reference to it. |
| 8708 | */ |
Al Viro | a6fa941 | 2012-08-20 14:59:25 +0100 | [diff] [blame] | 8709 | put_event(parent_event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8710 | } |
| 8711 | |
| 8712 | static void |
| 8713 | __perf_event_exit_task(struct perf_event *child_event, |
| 8714 | struct perf_event_context *child_ctx, |
| 8715 | struct task_struct *child) |
| 8716 | { |
Peter Zijlstra | 1903d50 | 2014-07-15 17:27:27 +0200 | [diff] [blame] | 8717 | /* |
| 8718 | * Do not destroy the 'original' grouping; because of the context |
| 8719 | * switch optimization the original events could've ended up in a |
| 8720 | * random child task. |
| 8721 | * |
| 8722 | * If we were to destroy the original group, all group related |
| 8723 | * operations would cease to function properly after this random |
| 8724 | * child dies. |
| 8725 | * |
| 8726 | * Do destroy all inherited groups, we don't care about those |
| 8727 | * and being thorough is better. |
| 8728 | */ |
| 8729 | perf_remove_from_context(child_event, !!child_event->parent); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8730 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8731 | /* |
Peter Zijlstra | 38b435b | 2011-03-15 14:37:10 +0100 | [diff] [blame] | 8732 | * It can happen that the parent exits first, and has events |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8733 | * that are still around due to the child reference. These |
Peter Zijlstra | 38b435b | 2011-03-15 14:37:10 +0100 | [diff] [blame] | 8734 | * events need to be zapped. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8735 | */ |
Peter Zijlstra | 38b435b | 2011-03-15 14:37:10 +0100 | [diff] [blame] | 8736 | if (child_event->parent) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8737 | sync_child_event(child_event, child); |
| 8738 | free_event(child_event); |
Jiri Olsa | 179033b | 2014-08-07 11:48:26 -0400 | [diff] [blame] | 8739 | } else { |
| 8740 | child_event->state = PERF_EVENT_STATE_EXIT; |
| 8741 | perf_event_wakeup(child_event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8742 | } |
| 8743 | } |
| 8744 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8745 | static void perf_event_exit_task_context(struct task_struct *child, int ctxn) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8746 | { |
Peter Zijlstra | ebf905f | 2014-05-29 19:00:24 +0200 | [diff] [blame] | 8747 | struct perf_event *child_event, *next; |
Peter Zijlstra | 211de6e | 2014-09-30 19:23:08 +0200 | [diff] [blame] | 8748 | struct perf_event_context *child_ctx, *clone_ctx = NULL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8749 | unsigned long flags; |
| 8750 | |
Jiri Olsa | 4e93ad6 | 2015-11-04 16:00:05 +0100 | [diff] [blame] | 8751 | if (likely(!child->perf_event_ctxp[ctxn])) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8752 | return; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8753 | |
| 8754 | local_irq_save(flags); |
| 8755 | /* |
| 8756 | * We can't reschedule here because interrupts are disabled, |
| 8757 | * and either child is current or it is a task that can't be |
| 8758 | * scheduled, so we are now safe from rescheduling changing |
| 8759 | * our context. |
| 8760 | */ |
Oleg Nesterov | 806839b | 2011-01-21 18:45:47 +0100 | [diff] [blame] | 8761 | child_ctx = rcu_dereference_raw(child->perf_event_ctxp[ctxn]); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8762 | |
| 8763 | /* |
| 8764 | * Take the context lock here so that if find_get_context is |
| 8765 | * reading child->perf_event_ctxp, we wait until it has |
| 8766 | * incremented the context's refcount before we do put_ctx below. |
| 8767 | */ |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 8768 | raw_spin_lock(&child_ctx->lock); |
Peter Zijlstra | 3e34950 | 2016-01-08 10:01:18 +0100 | [diff] [blame] | 8769 | task_ctx_sched_out(__get_cpu_context(child_ctx), child_ctx); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8770 | child->perf_event_ctxp[ctxn] = NULL; |
Peter Zijlstra | 4a1c0f2 | 2014-06-23 16:12:42 +0200 | [diff] [blame] | 8771 | |
| 8772 | /* |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8773 | * If this context is a clone; unclone it so it can't get |
| 8774 | * swapped to another process while we're removing all |
| 8775 | * the events from it. |
| 8776 | */ |
Peter Zijlstra | 211de6e | 2014-09-30 19:23:08 +0200 | [diff] [blame] | 8777 | clone_ctx = unclone_ctx(child_ctx); |
Peter Zijlstra | 5e942bb | 2009-11-23 11:37:26 +0100 | [diff] [blame] | 8778 | update_context_time(child_ctx); |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 8779 | raw_spin_unlock_irqrestore(&child_ctx->lock, flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8780 | |
Peter Zijlstra | 211de6e | 2014-09-30 19:23:08 +0200 | [diff] [blame] | 8781 | if (clone_ctx) |
| 8782 | put_ctx(clone_ctx); |
Peter Zijlstra | 4a1c0f2 | 2014-06-23 16:12:42 +0200 | [diff] [blame] | 8783 | |
| 8784 | /* |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8785 | * Report the task dead after unscheduling the events so that we |
| 8786 | * won't get any samples after PERF_RECORD_EXIT. We can however still |
| 8787 | * get a few PERF_RECORD_READ events. |
| 8788 | */ |
| 8789 | perf_event_task(child, child_ctx, 0); |
| 8790 | |
| 8791 | /* |
| 8792 | * We can recurse on the same lock type through: |
| 8793 | * |
| 8794 | * __perf_event_exit_task() |
| 8795 | * sync_child_event() |
Al Viro | a6fa941 | 2012-08-20 14:59:25 +0100 | [diff] [blame] | 8796 | * put_event() |
| 8797 | * mutex_lock(&ctx->mutex) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8798 | * |
| 8799 | * But since its the parent context it won't be the same instance. |
| 8800 | */ |
Peter Zijlstra | a0507c8 | 2010-05-06 15:42:53 +0200 | [diff] [blame] | 8801 | mutex_lock(&child_ctx->mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8802 | |
Peter Zijlstra | ebf905f | 2014-05-29 19:00:24 +0200 | [diff] [blame] | 8803 | list_for_each_entry_safe(child_event, next, &child_ctx->event_list, event_entry) |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 8804 | __perf_event_exit_task(child_event, child_ctx, child); |
| 8805 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8806 | mutex_unlock(&child_ctx->mutex); |
| 8807 | |
| 8808 | put_ctx(child_ctx); |
| 8809 | } |
| 8810 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8811 | /* |
| 8812 | * When a child task exits, feed back event values to parent events. |
| 8813 | */ |
| 8814 | void perf_event_exit_task(struct task_struct *child) |
| 8815 | { |
Peter Zijlstra | 8882135 | 2010-11-09 19:01:43 +0100 | [diff] [blame] | 8816 | struct perf_event *event, *tmp; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8817 | int ctxn; |
| 8818 | |
Peter Zijlstra | 8882135 | 2010-11-09 19:01:43 +0100 | [diff] [blame] | 8819 | mutex_lock(&child->perf_event_mutex); |
| 8820 | list_for_each_entry_safe(event, tmp, &child->perf_event_list, |
| 8821 | owner_entry) { |
| 8822 | list_del_init(&event->owner_entry); |
| 8823 | |
| 8824 | /* |
| 8825 | * Ensure the list deletion is visible before we clear |
| 8826 | * the owner, closes a race against perf_release() where |
| 8827 | * we need to serialize on the owner->perf_event_mutex. |
| 8828 | */ |
| 8829 | smp_wmb(); |
| 8830 | event->owner = NULL; |
| 8831 | } |
| 8832 | mutex_unlock(&child->perf_event_mutex); |
| 8833 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8834 | for_each_task_context_nr(ctxn) |
| 8835 | perf_event_exit_task_context(child, ctxn); |
Jiri Olsa | 4e93ad6 | 2015-11-04 16:00:05 +0100 | [diff] [blame] | 8836 | |
| 8837 | /* |
| 8838 | * The perf_event_exit_task_context calls perf_event_task |
| 8839 | * with child's task_ctx, which generates EXIT events for |
| 8840 | * child contexts and sets child->perf_event_ctxp[] to NULL. |
| 8841 | * At this point we need to send EXIT events to cpu contexts. |
| 8842 | */ |
| 8843 | perf_event_task(child, NULL, 0); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8844 | } |
| 8845 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 8846 | static void perf_free_event(struct perf_event *event, |
| 8847 | struct perf_event_context *ctx) |
| 8848 | { |
| 8849 | struct perf_event *parent = event->parent; |
| 8850 | |
| 8851 | if (WARN_ON_ONCE(!parent)) |
| 8852 | return; |
| 8853 | |
| 8854 | mutex_lock(&parent->child_mutex); |
| 8855 | list_del_init(&event->child_list); |
| 8856 | mutex_unlock(&parent->child_mutex); |
| 8857 | |
Al Viro | a6fa941 | 2012-08-20 14:59:25 +0100 | [diff] [blame] | 8858 | put_event(parent); |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 8859 | |
Peter Zijlstra | 652884f | 2015-01-23 11:20:10 +0100 | [diff] [blame] | 8860 | raw_spin_lock_irq(&ctx->lock); |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 8861 | perf_group_detach(event); |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 8862 | list_del_event(event, ctx); |
Peter Zijlstra | 652884f | 2015-01-23 11:20:10 +0100 | [diff] [blame] | 8863 | raw_spin_unlock_irq(&ctx->lock); |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 8864 | free_event(event); |
| 8865 | } |
| 8866 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8867 | /* |
Peter Zijlstra | 652884f | 2015-01-23 11:20:10 +0100 | [diff] [blame] | 8868 | * Free an unexposed, unused context as created by inheritance by |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8869 | * perf_event_init_task below, used by fork() in case of fail. |
Peter Zijlstra | 652884f | 2015-01-23 11:20:10 +0100 | [diff] [blame] | 8870 | * |
| 8871 | * Not all locks are strictly required, but take them anyway to be nice and |
| 8872 | * help out with the lockdep assertions. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8873 | */ |
| 8874 | void perf_event_free_task(struct task_struct *task) |
| 8875 | { |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8876 | struct perf_event_context *ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8877 | struct perf_event *event, *tmp; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8878 | int ctxn; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8879 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8880 | for_each_task_context_nr(ctxn) { |
| 8881 | ctx = task->perf_event_ctxp[ctxn]; |
| 8882 | if (!ctx) |
| 8883 | continue; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8884 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8885 | mutex_lock(&ctx->mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8886 | again: |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8887 | list_for_each_entry_safe(event, tmp, &ctx->pinned_groups, |
| 8888 | group_entry) |
| 8889 | perf_free_event(event, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8890 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8891 | list_for_each_entry_safe(event, tmp, &ctx->flexible_groups, |
| 8892 | group_entry) |
| 8893 | perf_free_event(event, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8894 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8895 | if (!list_empty(&ctx->pinned_groups) || |
| 8896 | !list_empty(&ctx->flexible_groups)) |
| 8897 | goto again; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8898 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8899 | mutex_unlock(&ctx->mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8900 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 8901 | put_ctx(ctx); |
| 8902 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 8903 | } |
| 8904 | |
Peter Zijlstra | 4e231c7 | 2010-09-09 21:01:59 +0200 | [diff] [blame] | 8905 | void perf_event_delayed_put(struct task_struct *task) |
| 8906 | { |
| 8907 | int ctxn; |
| 8908 | |
| 8909 | for_each_task_context_nr(ctxn) |
| 8910 | WARN_ON_ONCE(task->perf_event_ctxp[ctxn]); |
| 8911 | } |
| 8912 | |
Kaixu Xia | ffe8690 | 2015-08-06 07:02:32 +0000 | [diff] [blame] | 8913 | struct perf_event *perf_event_get(unsigned int fd) |
| 8914 | { |
| 8915 | int err; |
| 8916 | struct fd f; |
| 8917 | struct perf_event *event; |
| 8918 | |
| 8919 | err = perf_fget_light(fd, &f); |
| 8920 | if (err) |
| 8921 | return ERR_PTR(err); |
| 8922 | |
| 8923 | event = f.file->private_data; |
| 8924 | atomic_long_inc(&event->refcount); |
| 8925 | fdput(f); |
| 8926 | |
| 8927 | return event; |
| 8928 | } |
| 8929 | |
| 8930 | const struct perf_event_attr *perf_event_attrs(struct perf_event *event) |
| 8931 | { |
| 8932 | if (!event) |
| 8933 | return ERR_PTR(-EINVAL); |
| 8934 | |
| 8935 | return &event->attr; |
| 8936 | } |
| 8937 | |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 8938 | /* |
| 8939 | * inherit a event from parent task to child task: |
| 8940 | */ |
| 8941 | static struct perf_event * |
| 8942 | inherit_event(struct perf_event *parent_event, |
| 8943 | struct task_struct *parent, |
| 8944 | struct perf_event_context *parent_ctx, |
| 8945 | struct task_struct *child, |
| 8946 | struct perf_event *group_leader, |
| 8947 | struct perf_event_context *child_ctx) |
| 8948 | { |
Jiri Olsa | 1929def | 2014-09-12 13:18:27 +0200 | [diff] [blame] | 8949 | enum perf_event_active_state parent_state = parent_event->state; |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 8950 | struct perf_event *child_event; |
Peter Zijlstra | cee010e | 2010-09-10 12:51:54 +0200 | [diff] [blame] | 8951 | unsigned long flags; |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 8952 | |
| 8953 | /* |
| 8954 | * Instead of creating recursive hierarchies of events, |
| 8955 | * we link inherited events back to the original parent, |
| 8956 | * which has a filp for sure, which we use as the reference |
| 8957 | * count: |
| 8958 | */ |
| 8959 | if (parent_event->parent) |
| 8960 | parent_event = parent_event->parent; |
| 8961 | |
| 8962 | child_event = perf_event_alloc(&parent_event->attr, |
| 8963 | parent_event->cpu, |
Peter Zijlstra | d580ff8 | 2010-10-14 17:43:23 +0200 | [diff] [blame] | 8964 | child, |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 8965 | group_leader, parent_event, |
Matt Fleming | 79dff51 | 2015-01-23 18:45:42 +0000 | [diff] [blame] | 8966 | NULL, NULL, -1); |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 8967 | if (IS_ERR(child_event)) |
| 8968 | return child_event; |
Al Viro | a6fa941 | 2012-08-20 14:59:25 +0100 | [diff] [blame] | 8969 | |
Jiri Olsa | fadfe7b | 2014-08-01 14:33:02 +0200 | [diff] [blame] | 8970 | if (is_orphaned_event(parent_event) || |
| 8971 | !atomic_long_inc_not_zero(&parent_event->refcount)) { |
Al Viro | a6fa941 | 2012-08-20 14:59:25 +0100 | [diff] [blame] | 8972 | free_event(child_event); |
| 8973 | return NULL; |
| 8974 | } |
| 8975 | |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 8976 | get_ctx(child_ctx); |
| 8977 | |
| 8978 | /* |
| 8979 | * Make the child state follow the state of the parent event, |
| 8980 | * not its attr.disabled bit. We hold the parent's mutex, |
| 8981 | * so we won't race with perf_event_{en, dis}able_family. |
| 8982 | */ |
Jiri Olsa | 1929def | 2014-09-12 13:18:27 +0200 | [diff] [blame] | 8983 | if (parent_state >= PERF_EVENT_STATE_INACTIVE) |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 8984 | child_event->state = PERF_EVENT_STATE_INACTIVE; |
| 8985 | else |
| 8986 | child_event->state = PERF_EVENT_STATE_OFF; |
| 8987 | |
| 8988 | if (parent_event->attr.freq) { |
| 8989 | u64 sample_period = parent_event->hw.sample_period; |
| 8990 | struct hw_perf_event *hwc = &child_event->hw; |
| 8991 | |
| 8992 | hwc->sample_period = sample_period; |
| 8993 | hwc->last_period = sample_period; |
| 8994 | |
| 8995 | local64_set(&hwc->period_left, sample_period); |
| 8996 | } |
| 8997 | |
| 8998 | child_event->ctx = child_ctx; |
| 8999 | child_event->overflow_handler = parent_event->overflow_handler; |
Avi Kivity | 4dc0da8 | 2011-06-29 18:42:35 +0300 | [diff] [blame] | 9000 | child_event->overflow_handler_context |
| 9001 | = parent_event->overflow_handler_context; |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 9002 | |
| 9003 | /* |
Thomas Gleixner | 614b678 | 2010-12-03 16:24:32 -0200 | [diff] [blame] | 9004 | * Precalculate sample_data sizes |
| 9005 | */ |
| 9006 | perf_event__header_size(child_event); |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 9007 | perf_event__id_header_size(child_event); |
Thomas Gleixner | 614b678 | 2010-12-03 16:24:32 -0200 | [diff] [blame] | 9008 | |
| 9009 | /* |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 9010 | * Link it up in the child's context: |
| 9011 | */ |
Peter Zijlstra | cee010e | 2010-09-10 12:51:54 +0200 | [diff] [blame] | 9012 | raw_spin_lock_irqsave(&child_ctx->lock, flags); |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 9013 | add_event_to_ctx(child_event, child_ctx); |
Peter Zijlstra | cee010e | 2010-09-10 12:51:54 +0200 | [diff] [blame] | 9014 | raw_spin_unlock_irqrestore(&child_ctx->lock, flags); |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 9015 | |
| 9016 | /* |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 9017 | * Link this into the parent event's child list |
| 9018 | */ |
| 9019 | WARN_ON_ONCE(parent_event->ctx->parent_ctx); |
| 9020 | mutex_lock(&parent_event->child_mutex); |
| 9021 | list_add_tail(&child_event->child_list, &parent_event->child_list); |
| 9022 | mutex_unlock(&parent_event->child_mutex); |
| 9023 | |
| 9024 | return child_event; |
| 9025 | } |
| 9026 | |
| 9027 | static int inherit_group(struct perf_event *parent_event, |
| 9028 | struct task_struct *parent, |
| 9029 | struct perf_event_context *parent_ctx, |
| 9030 | struct task_struct *child, |
| 9031 | struct perf_event_context *child_ctx) |
| 9032 | { |
| 9033 | struct perf_event *leader; |
| 9034 | struct perf_event *sub; |
| 9035 | struct perf_event *child_ctr; |
| 9036 | |
| 9037 | leader = inherit_event(parent_event, parent, parent_ctx, |
| 9038 | child, NULL, child_ctx); |
| 9039 | if (IS_ERR(leader)) |
| 9040 | return PTR_ERR(leader); |
| 9041 | list_for_each_entry(sub, &parent_event->sibling_list, group_entry) { |
| 9042 | child_ctr = inherit_event(sub, parent, parent_ctx, |
| 9043 | child, leader, child_ctx); |
| 9044 | if (IS_ERR(child_ctr)) |
| 9045 | return PTR_ERR(child_ctr); |
| 9046 | } |
| 9047 | return 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9048 | } |
| 9049 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 9050 | static int |
| 9051 | inherit_task_group(struct perf_event *event, struct task_struct *parent, |
| 9052 | struct perf_event_context *parent_ctx, |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 9053 | struct task_struct *child, int ctxn, |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 9054 | int *inherited_all) |
| 9055 | { |
| 9056 | int ret; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 9057 | struct perf_event_context *child_ctx; |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 9058 | |
| 9059 | if (!event->attr.inherit) { |
| 9060 | *inherited_all = 0; |
| 9061 | return 0; |
| 9062 | } |
| 9063 | |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 9064 | child_ctx = child->perf_event_ctxp[ctxn]; |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 9065 | if (!child_ctx) { |
| 9066 | /* |
| 9067 | * This is executed from the parent task context, so |
| 9068 | * inherit events that have been marked for cloning. |
| 9069 | * First allocate and initialize a context for the |
| 9070 | * child. |
| 9071 | */ |
| 9072 | |
Jiri Olsa | 734df5a | 2013-07-09 17:44:10 +0200 | [diff] [blame] | 9073 | child_ctx = alloc_perf_context(parent_ctx->pmu, child); |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 9074 | if (!child_ctx) |
| 9075 | return -ENOMEM; |
| 9076 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 9077 | child->perf_event_ctxp[ctxn] = child_ctx; |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 9078 | } |
| 9079 | |
| 9080 | ret = inherit_group(event, parent, parent_ctx, |
| 9081 | child, child_ctx); |
| 9082 | |
| 9083 | if (ret) |
| 9084 | *inherited_all = 0; |
| 9085 | |
| 9086 | return ret; |
| 9087 | } |
| 9088 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9089 | /* |
| 9090 | * Initialize the perf_event context in task_struct |
| 9091 | */ |
Jiri Olsa | 985c8dc | 2014-06-24 10:20:24 +0200 | [diff] [blame] | 9092 | static int perf_event_init_context(struct task_struct *child, int ctxn) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9093 | { |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 9094 | struct perf_event_context *child_ctx, *parent_ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9095 | struct perf_event_context *cloned_ctx; |
| 9096 | struct perf_event *event; |
| 9097 | struct task_struct *parent = current; |
| 9098 | int inherited_all = 1; |
Thomas Gleixner | dddd337 | 2010-11-24 10:05:55 +0100 | [diff] [blame] | 9099 | unsigned long flags; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9100 | int ret = 0; |
| 9101 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 9102 | if (likely(!parent->perf_event_ctxp[ctxn])) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9103 | return 0; |
| 9104 | |
| 9105 | /* |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9106 | * If the parent's context is a clone, pin it so it won't get |
| 9107 | * swapped under us. |
| 9108 | */ |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 9109 | parent_ctx = perf_pin_task_context(parent, ctxn); |
Peter Zijlstra | ffb4ef2 | 2014-05-05 19:12:20 +0200 | [diff] [blame] | 9110 | if (!parent_ctx) |
| 9111 | return 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9112 | |
| 9113 | /* |
| 9114 | * No need to check if parent_ctx != NULL here; since we saw |
| 9115 | * it non-NULL earlier, the only reason for it to become NULL |
| 9116 | * is if we exit, and since we're currently in the middle of |
| 9117 | * a fork we can't be exiting at the same time. |
| 9118 | */ |
| 9119 | |
| 9120 | /* |
| 9121 | * Lock the parent list. No need to lock the child - not PID |
| 9122 | * hashed yet and not running, so nobody can access it. |
| 9123 | */ |
| 9124 | mutex_lock(&parent_ctx->mutex); |
| 9125 | |
| 9126 | /* |
| 9127 | * We dont have to disable NMIs - we are only looking at |
| 9128 | * the list, not manipulating it: |
| 9129 | */ |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 9130 | list_for_each_entry(event, &parent_ctx->pinned_groups, group_entry) { |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 9131 | ret = inherit_task_group(event, parent, parent_ctx, |
| 9132 | child, ctxn, &inherited_all); |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 9133 | if (ret) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9134 | break; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9135 | } |
| 9136 | |
Thomas Gleixner | dddd337 | 2010-11-24 10:05:55 +0100 | [diff] [blame] | 9137 | /* |
| 9138 | * We can't hold ctx->lock when iterating the ->flexible_group list due |
| 9139 | * to allocations, but we need to prevent rotation because |
| 9140 | * rotate_ctx() will change the list from interrupt context. |
| 9141 | */ |
| 9142 | raw_spin_lock_irqsave(&parent_ctx->lock, flags); |
| 9143 | parent_ctx->rotate_disable = 1; |
| 9144 | raw_spin_unlock_irqrestore(&parent_ctx->lock, flags); |
| 9145 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 9146 | list_for_each_entry(event, &parent_ctx->flexible_groups, group_entry) { |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 9147 | ret = inherit_task_group(event, parent, parent_ctx, |
| 9148 | child, ctxn, &inherited_all); |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 9149 | if (ret) |
| 9150 | break; |
| 9151 | } |
| 9152 | |
Thomas Gleixner | dddd337 | 2010-11-24 10:05:55 +0100 | [diff] [blame] | 9153 | raw_spin_lock_irqsave(&parent_ctx->lock, flags); |
| 9154 | parent_ctx->rotate_disable = 0; |
Thomas Gleixner | dddd337 | 2010-11-24 10:05:55 +0100 | [diff] [blame] | 9155 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 9156 | child_ctx = child->perf_event_ctxp[ctxn]; |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 9157 | |
Peter Zijlstra | 05cbaa2 | 2009-12-30 16:00:35 +0100 | [diff] [blame] | 9158 | if (child_ctx && inherited_all) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9159 | /* |
| 9160 | * Mark the child context as a clone of the parent |
| 9161 | * context, or of whatever the parent is a clone of. |
Peter Zijlstra | c5ed514 | 2011-01-17 13:45:37 +0100 | [diff] [blame] | 9162 | * |
| 9163 | * Note that if the parent is a clone, the holding of |
| 9164 | * parent_ctx->lock avoids it from being uncloned. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9165 | */ |
Peter Zijlstra | c5ed514 | 2011-01-17 13:45:37 +0100 | [diff] [blame] | 9166 | cloned_ctx = parent_ctx->parent_ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9167 | if (cloned_ctx) { |
| 9168 | child_ctx->parent_ctx = cloned_ctx; |
| 9169 | child_ctx->parent_gen = parent_ctx->parent_gen; |
| 9170 | } else { |
| 9171 | child_ctx->parent_ctx = parent_ctx; |
| 9172 | child_ctx->parent_gen = parent_ctx->generation; |
| 9173 | } |
| 9174 | get_ctx(child_ctx->parent_ctx); |
| 9175 | } |
| 9176 | |
Peter Zijlstra | c5ed514 | 2011-01-17 13:45:37 +0100 | [diff] [blame] | 9177 | raw_spin_unlock_irqrestore(&parent_ctx->lock, flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9178 | mutex_unlock(&parent_ctx->mutex); |
| 9179 | |
| 9180 | perf_unpin_context(parent_ctx); |
Peter Zijlstra | fe4b04f | 2011-02-02 13:19:09 +0100 | [diff] [blame] | 9181 | put_ctx(parent_ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9182 | |
| 9183 | return ret; |
| 9184 | } |
| 9185 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 9186 | /* |
| 9187 | * Initialize the perf_event context in task_struct |
| 9188 | */ |
| 9189 | int perf_event_init_task(struct task_struct *child) |
| 9190 | { |
| 9191 | int ctxn, ret; |
| 9192 | |
Oleg Nesterov | 8550d7c | 2011-01-19 19:22:28 +0100 | [diff] [blame] | 9193 | memset(child->perf_event_ctxp, 0, sizeof(child->perf_event_ctxp)); |
| 9194 | mutex_init(&child->perf_event_mutex); |
| 9195 | INIT_LIST_HEAD(&child->perf_event_list); |
| 9196 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 9197 | for_each_task_context_nr(ctxn) { |
| 9198 | ret = perf_event_init_context(child, ctxn); |
Peter Zijlstra | 6c72e350 | 2014-10-02 16:17:02 -0700 | [diff] [blame] | 9199 | if (ret) { |
| 9200 | perf_event_free_task(child); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 9201 | return ret; |
Peter Zijlstra | 6c72e350 | 2014-10-02 16:17:02 -0700 | [diff] [blame] | 9202 | } |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 9203 | } |
| 9204 | |
| 9205 | return 0; |
| 9206 | } |
| 9207 | |
Paul Mackerras | 220b140 | 2010-03-10 20:45:52 +1100 | [diff] [blame] | 9208 | static void __init perf_event_init_all_cpus(void) |
| 9209 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 9210 | struct swevent_htable *swhash; |
Paul Mackerras | 220b140 | 2010-03-10 20:45:52 +1100 | [diff] [blame] | 9211 | int cpu; |
Paul Mackerras | 220b140 | 2010-03-10 20:45:52 +1100 | [diff] [blame] | 9212 | |
| 9213 | for_each_possible_cpu(cpu) { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 9214 | swhash = &per_cpu(swevent_htable, cpu); |
| 9215 | mutex_init(&swhash->hlist_mutex); |
Mark Rutland | 2fde4f9 | 2015-01-07 15:01:54 +0000 | [diff] [blame] | 9216 | INIT_LIST_HEAD(&per_cpu(active_ctx_list, cpu)); |
Paul Mackerras | 220b140 | 2010-03-10 20:45:52 +1100 | [diff] [blame] | 9217 | } |
| 9218 | } |
| 9219 | |
Paul Gortmaker | 0db0628 | 2013-06-19 14:53:51 -0400 | [diff] [blame] | 9220 | static void perf_event_init_cpu(int cpu) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9221 | { |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 9222 | struct swevent_htable *swhash = &per_cpu(swevent_htable, cpu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9223 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 9224 | mutex_lock(&swhash->hlist_mutex); |
Linus Torvalds | 4536e4d | 2011-11-03 07:44:04 -0700 | [diff] [blame] | 9225 | if (swhash->hlist_refcount > 0) { |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 9226 | struct swevent_hlist *hlist; |
| 9227 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 9228 | hlist = kzalloc_node(sizeof(*hlist), GFP_KERNEL, cpu_to_node(cpu)); |
| 9229 | WARN_ON(!hlist); |
| 9230 | rcu_assign_pointer(swhash->swevent_hlist, hlist); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 9231 | } |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 9232 | mutex_unlock(&swhash->hlist_mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9233 | } |
| 9234 | |
Dave Young | 2965faa | 2015-09-09 15:38:55 -0700 | [diff] [blame] | 9235 | #if defined CONFIG_HOTPLUG_CPU || defined CONFIG_KEXEC_CORE |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 9236 | static void __perf_event_exit_context(void *__info) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9237 | { |
Mark Rutland | 226424e | 2014-11-05 16:11:44 +0000 | [diff] [blame] | 9238 | struct remove_event re = { .detach_group = true }; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 9239 | struct perf_event_context *ctx = __info; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9240 | |
Peter Zijlstra | e3703f8 | 2014-02-24 12:06:12 +0100 | [diff] [blame] | 9241 | rcu_read_lock(); |
Peter Zijlstra | 46ce0fe | 2014-05-02 16:56:01 +0200 | [diff] [blame] | 9242 | list_for_each_entry_rcu(re.event, &ctx->event_list, event_entry) |
| 9243 | __perf_remove_from_context(&re); |
Peter Zijlstra | e3703f8 | 2014-02-24 12:06:12 +0100 | [diff] [blame] | 9244 | rcu_read_unlock(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9245 | } |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 9246 | |
| 9247 | static void perf_event_exit_cpu_context(int cpu) |
| 9248 | { |
| 9249 | struct perf_event_context *ctx; |
| 9250 | struct pmu *pmu; |
| 9251 | int idx; |
| 9252 | |
| 9253 | idx = srcu_read_lock(&pmus_srcu); |
| 9254 | list_for_each_entry_rcu(pmu, &pmus, entry) { |
Peter Zijlstra | 917bdd1 | 2010-09-17 11:28:49 +0200 | [diff] [blame] | 9255 | ctx = &per_cpu_ptr(pmu->pmu_cpu_context, cpu)->ctx; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 9256 | |
| 9257 | mutex_lock(&ctx->mutex); |
| 9258 | smp_call_function_single(cpu, __perf_event_exit_context, ctx, 1); |
| 9259 | mutex_unlock(&ctx->mutex); |
| 9260 | } |
| 9261 | srcu_read_unlock(&pmus_srcu, idx); |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 9262 | } |
| 9263 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9264 | static void perf_event_exit_cpu(int cpu) |
| 9265 | { |
Peter Zijlstra | e3703f8 | 2014-02-24 12:06:12 +0100 | [diff] [blame] | 9266 | perf_event_exit_cpu_context(cpu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9267 | } |
| 9268 | #else |
| 9269 | static inline void perf_event_exit_cpu(int cpu) { } |
| 9270 | #endif |
| 9271 | |
Peter Zijlstra | c277443 | 2010-12-08 15:29:02 +0100 | [diff] [blame] | 9272 | static int |
| 9273 | perf_reboot(struct notifier_block *notifier, unsigned long val, void *v) |
| 9274 | { |
| 9275 | int cpu; |
| 9276 | |
| 9277 | for_each_online_cpu(cpu) |
| 9278 | perf_event_exit_cpu(cpu); |
| 9279 | |
| 9280 | return NOTIFY_OK; |
| 9281 | } |
| 9282 | |
| 9283 | /* |
| 9284 | * Run the perf reboot notifier at the very last possible moment so that |
| 9285 | * the generic watchdog code runs as long as possible. |
| 9286 | */ |
| 9287 | static struct notifier_block perf_reboot_notifier = { |
| 9288 | .notifier_call = perf_reboot, |
| 9289 | .priority = INT_MIN, |
| 9290 | }; |
| 9291 | |
Paul Gortmaker | 0db0628 | 2013-06-19 14:53:51 -0400 | [diff] [blame] | 9292 | static int |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9293 | perf_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu) |
| 9294 | { |
| 9295 | unsigned int cpu = (long)hcpu; |
| 9296 | |
Linus Torvalds | 4536e4d | 2011-11-03 07:44:04 -0700 | [diff] [blame] | 9297 | switch (action & ~CPU_TASKS_FROZEN) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9298 | |
| 9299 | case CPU_UP_PREPARE: |
Peter Zijlstra | 5e11637 | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 9300 | case CPU_DOWN_FAILED: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9301 | perf_event_init_cpu(cpu); |
| 9302 | break; |
| 9303 | |
Peter Zijlstra | 5e11637 | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 9304 | case CPU_UP_CANCELED: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9305 | case CPU_DOWN_PREPARE: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9306 | perf_event_exit_cpu(cpu); |
| 9307 | break; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9308 | default: |
| 9309 | break; |
| 9310 | } |
| 9311 | |
| 9312 | return NOTIFY_OK; |
| 9313 | } |
| 9314 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9315 | void __init perf_event_init(void) |
| 9316 | { |
Jason Wessel | 3c502e7 | 2010-11-04 17:33:01 -0500 | [diff] [blame] | 9317 | int ret; |
| 9318 | |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 9319 | idr_init(&pmu_idr); |
| 9320 | |
Paul Mackerras | 220b140 | 2010-03-10 20:45:52 +1100 | [diff] [blame] | 9321 | perf_event_init_all_cpus(); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 9322 | init_srcu_struct(&pmus_srcu); |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 9323 | perf_pmu_register(&perf_swevent, "software", PERF_TYPE_SOFTWARE); |
| 9324 | perf_pmu_register(&perf_cpu_clock, NULL, -1); |
| 9325 | perf_pmu_register(&perf_task_clock, NULL, -1); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 9326 | perf_tp_register(); |
| 9327 | perf_cpu_notifier(perf_cpu_notify); |
Peter Zijlstra | c277443 | 2010-12-08 15:29:02 +0100 | [diff] [blame] | 9328 | register_reboot_notifier(&perf_reboot_notifier); |
Jason Wessel | 3c502e7 | 2010-11-04 17:33:01 -0500 | [diff] [blame] | 9329 | |
| 9330 | ret = init_hw_breakpoint(); |
| 9331 | WARN(ret, "hw_breakpoint initialization failed with: %d", ret); |
Gleb Natapov | b202952 | 2011-11-27 17:59:09 +0200 | [diff] [blame] | 9332 | |
| 9333 | /* do not patch jump label more than once per second */ |
| 9334 | jump_label_rate_limit(&perf_sched_events, HZ); |
Jiri Olsa | b01c3a0 | 2012-03-23 15:41:20 +0100 | [diff] [blame] | 9335 | |
| 9336 | /* |
| 9337 | * Build time assertion that we keep the data_head at the intended |
| 9338 | * location. IOW, validation we got the __reserved[] size right. |
| 9339 | */ |
| 9340 | BUILD_BUG_ON((offsetof(struct perf_event_mmap_page, data_head)) |
| 9341 | != 1024); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 9342 | } |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 9343 | |
Cody P Schafer | fd979c0 | 2015-01-30 13:45:57 -0800 | [diff] [blame] | 9344 | ssize_t perf_event_sysfs_show(struct device *dev, struct device_attribute *attr, |
| 9345 | char *page) |
| 9346 | { |
| 9347 | struct perf_pmu_events_attr *pmu_attr = |
| 9348 | container_of(attr, struct perf_pmu_events_attr, attr); |
| 9349 | |
| 9350 | if (pmu_attr->event_str) |
| 9351 | return sprintf(page, "%s\n", pmu_attr->event_str); |
| 9352 | |
| 9353 | return 0; |
| 9354 | } |
| 9355 | |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 9356 | static int __init perf_event_sysfs_init(void) |
| 9357 | { |
| 9358 | struct pmu *pmu; |
| 9359 | int ret; |
| 9360 | |
| 9361 | mutex_lock(&pmus_lock); |
| 9362 | |
| 9363 | ret = bus_register(&pmu_bus); |
| 9364 | if (ret) |
| 9365 | goto unlock; |
| 9366 | |
| 9367 | list_for_each_entry(pmu, &pmus, entry) { |
| 9368 | if (!pmu->name || pmu->type < 0) |
| 9369 | continue; |
| 9370 | |
| 9371 | ret = pmu_dev_alloc(pmu); |
| 9372 | WARN(ret, "Failed to register pmu: %s, reason %d\n", pmu->name, ret); |
| 9373 | } |
| 9374 | pmu_bus_running = 1; |
| 9375 | ret = 0; |
| 9376 | |
| 9377 | unlock: |
| 9378 | mutex_unlock(&pmus_lock); |
| 9379 | |
| 9380 | return ret; |
| 9381 | } |
| 9382 | device_initcall(perf_event_sysfs_init); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 9383 | |
| 9384 | #ifdef CONFIG_CGROUP_PERF |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 9385 | static struct cgroup_subsys_state * |
| 9386 | perf_cgroup_css_alloc(struct cgroup_subsys_state *parent_css) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 9387 | { |
| 9388 | struct perf_cgroup *jc; |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 9389 | |
Li Zefan | 1b15d05 | 2011-03-03 14:26:06 +0800 | [diff] [blame] | 9390 | jc = kzalloc(sizeof(*jc), GFP_KERNEL); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 9391 | if (!jc) |
| 9392 | return ERR_PTR(-ENOMEM); |
| 9393 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 9394 | jc->info = alloc_percpu(struct perf_cgroup_info); |
| 9395 | if (!jc->info) { |
| 9396 | kfree(jc); |
| 9397 | return ERR_PTR(-ENOMEM); |
| 9398 | } |
| 9399 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 9400 | return &jc->css; |
| 9401 | } |
| 9402 | |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 9403 | static void perf_cgroup_css_free(struct cgroup_subsys_state *css) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 9404 | { |
Tejun Heo | eb95419 | 2013-08-08 20:11:23 -0400 | [diff] [blame] | 9405 | struct perf_cgroup *jc = container_of(css, struct perf_cgroup, css); |
| 9406 | |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 9407 | free_percpu(jc->info); |
| 9408 | kfree(jc); |
| 9409 | } |
| 9410 | |
| 9411 | static int __perf_cgroup_move(void *info) |
| 9412 | { |
| 9413 | struct task_struct *task = info; |
Stephane Eranian | ddaaf4e | 2015-11-12 11:00:03 +0100 | [diff] [blame] | 9414 | rcu_read_lock(); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 9415 | perf_cgroup_switch(task, PERF_CGROUP_SWOUT | PERF_CGROUP_SWIN); |
Stephane Eranian | ddaaf4e | 2015-11-12 11:00:03 +0100 | [diff] [blame] | 9416 | rcu_read_unlock(); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 9417 | return 0; |
| 9418 | } |
| 9419 | |
Tejun Heo | 1f7dd3e5 | 2015-12-03 10:18:21 -0500 | [diff] [blame] | 9420 | static void perf_cgroup_attach(struct cgroup_taskset *tset) |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 9421 | { |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 9422 | struct task_struct *task; |
Tejun Heo | 1f7dd3e5 | 2015-12-03 10:18:21 -0500 | [diff] [blame] | 9423 | struct cgroup_subsys_state *css; |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 9424 | |
Tejun Heo | 1f7dd3e5 | 2015-12-03 10:18:21 -0500 | [diff] [blame] | 9425 | cgroup_taskset_for_each(task, css, tset) |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 9426 | task_function_call(task, __perf_cgroup_move, task); |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 9427 | } |
| 9428 | |
Tejun Heo | 073219e | 2014-02-08 10:36:58 -0500 | [diff] [blame] | 9429 | struct cgroup_subsys perf_event_cgrp_subsys = { |
Tejun Heo | 92fb974 | 2012-11-19 08:13:38 -0800 | [diff] [blame] | 9430 | .css_alloc = perf_cgroup_css_alloc, |
| 9431 | .css_free = perf_cgroup_css_free, |
Tejun Heo | bb9d97b | 2011-12-12 18:12:21 -0800 | [diff] [blame] | 9432 | .attach = perf_cgroup_attach, |
Stephane Eranian | e5d1367 | 2011-02-14 11:20:01 +0200 | [diff] [blame] | 9433 | }; |
| 9434 | #endif /* CONFIG_CGROUP_PERF */ |