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> |
| 5 | * Copyright (C) 2008-2009 Red Hat, Inc., Ingo Molnar |
| 6 | * Copyright (C) 2008-2009 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com> |
| 7 | * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com> |
| 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> |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 21 | #include <linux/sysfs.h> |
| 22 | #include <linux/dcache.h> |
| 23 | #include <linux/percpu.h> |
| 24 | #include <linux/ptrace.h> |
Peter Zijlstra | c277443 | 2010-12-08 15:29:02 +0100 | [diff] [blame] | 25 | #include <linux/reboot.h> |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 26 | #include <linux/vmstat.h> |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 27 | #include <linux/device.h> |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 28 | #include <linux/vmalloc.h> |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 29 | #include <linux/hardirq.h> |
| 30 | #include <linux/rculist.h> |
| 31 | #include <linux/uaccess.h> |
| 32 | #include <linux/syscalls.h> |
| 33 | #include <linux/anon_inodes.h> |
| 34 | #include <linux/kernel_stat.h> |
| 35 | #include <linux/perf_event.h> |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 36 | #include <linux/ftrace_event.h> |
Jason Wessel | 3c502e7 | 2010-11-04 17:33:01 -0500 | [diff] [blame] | 37 | #include <linux/hw_breakpoint.h> |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 38 | |
| 39 | #include <asm/irq_regs.h> |
| 40 | |
Stephane Eranian | 0b3fcf1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 41 | enum event_type_t { |
| 42 | EVENT_FLEXIBLE = 0x1, |
| 43 | EVENT_PINNED = 0x2, |
| 44 | EVENT_ALL = EVENT_FLEXIBLE | EVENT_PINNED, |
| 45 | }; |
| 46 | |
Peter Zijlstra | 82cd6de | 2010-10-14 17:57:23 +0200 | [diff] [blame] | 47 | atomic_t perf_task_events __read_mostly; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 48 | static atomic_t nr_mmap_events __read_mostly; |
| 49 | static atomic_t nr_comm_events __read_mostly; |
| 50 | static atomic_t nr_task_events __read_mostly; |
| 51 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 52 | static LIST_HEAD(pmus); |
| 53 | static DEFINE_MUTEX(pmus_lock); |
| 54 | static struct srcu_struct pmus_srcu; |
| 55 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 56 | /* |
| 57 | * perf event paranoia level: |
| 58 | * -1 - not paranoid at all |
| 59 | * 0 - disallow raw tracepoint access for unpriv |
| 60 | * 1 - disallow cpu events for unpriv |
| 61 | * 2 - disallow kernel profiling for unpriv |
| 62 | */ |
| 63 | int sysctl_perf_event_paranoid __read_mostly = 1; |
| 64 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 65 | int sysctl_perf_event_mlock __read_mostly = 512; /* 'free' kb per user */ |
| 66 | |
| 67 | /* |
| 68 | * max perf event sample rate |
| 69 | */ |
| 70 | int sysctl_perf_event_sample_rate __read_mostly = 100000; |
| 71 | |
| 72 | static atomic64_t perf_event_id; |
| 73 | |
Stephane Eranian | 0b3fcf1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 74 | static void cpu_ctx_sched_out(struct perf_cpu_context *cpuctx, |
| 75 | enum event_type_t event_type); |
| 76 | |
| 77 | static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx, |
| 78 | enum event_type_t event_type); |
| 79 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 80 | void __weak perf_event_print_debug(void) { } |
| 81 | |
Matt Fleming | 84c7991 | 2010-10-03 21:41:13 +0100 | [diff] [blame] | 82 | extern __weak const char *perf_pmu_name(void) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 83 | { |
Matt Fleming | 84c7991 | 2010-10-03 21:41:13 +0100 | [diff] [blame] | 84 | return "pmu"; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 85 | } |
| 86 | |
Stephane Eranian | 0b3fcf1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 87 | static inline u64 perf_clock(void) |
| 88 | { |
| 89 | return local_clock(); |
| 90 | } |
| 91 | |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 92 | void perf_pmu_disable(struct pmu *pmu) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 93 | { |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 94 | int *count = this_cpu_ptr(pmu->pmu_disable_count); |
| 95 | if (!(*count)++) |
| 96 | pmu->pmu_disable(pmu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 97 | } |
| 98 | |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 99 | void perf_pmu_enable(struct pmu *pmu) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 100 | { |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 101 | int *count = this_cpu_ptr(pmu->pmu_disable_count); |
| 102 | if (!--(*count)) |
| 103 | pmu->pmu_enable(pmu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 104 | } |
| 105 | |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 106 | static DEFINE_PER_CPU(struct list_head, rotation_list); |
| 107 | |
| 108 | /* |
| 109 | * perf_pmu_rotate_start() and perf_rotate_context() are fully serialized |
| 110 | * because they're strictly cpu affine and rotate_start is called with IRQs |
| 111 | * disabled, while rotate_context is called from IRQ context. |
| 112 | */ |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 113 | static void perf_pmu_rotate_start(struct pmu *pmu) |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 114 | { |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 115 | struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context); |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 116 | struct list_head *head = &__get_cpu_var(rotation_list); |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 117 | |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 118 | WARN_ON(!irqs_disabled()); |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 119 | |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 120 | if (list_empty(&cpuctx->rotation_list)) |
| 121 | list_add(&cpuctx->rotation_list, head); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | static void get_ctx(struct perf_event_context *ctx) |
| 125 | { |
| 126 | WARN_ON(!atomic_inc_not_zero(&ctx->refcount)); |
| 127 | } |
| 128 | |
| 129 | static void free_ctx(struct rcu_head *head) |
| 130 | { |
| 131 | struct perf_event_context *ctx; |
| 132 | |
| 133 | ctx = container_of(head, struct perf_event_context, rcu_head); |
| 134 | kfree(ctx); |
| 135 | } |
| 136 | |
| 137 | static void put_ctx(struct perf_event_context *ctx) |
| 138 | { |
| 139 | if (atomic_dec_and_test(&ctx->refcount)) { |
| 140 | if (ctx->parent_ctx) |
| 141 | put_ctx(ctx->parent_ctx); |
| 142 | if (ctx->task) |
| 143 | put_task_struct(ctx->task); |
| 144 | call_rcu(&ctx->rcu_head, free_ctx); |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | static void unclone_ctx(struct perf_event_context *ctx) |
| 149 | { |
| 150 | if (ctx->parent_ctx) { |
| 151 | put_ctx(ctx->parent_ctx); |
| 152 | ctx->parent_ctx = NULL; |
| 153 | } |
| 154 | } |
| 155 | |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 156 | static u32 perf_event_pid(struct perf_event *event, struct task_struct *p) |
| 157 | { |
| 158 | /* |
| 159 | * only top level events have the pid namespace they were created in |
| 160 | */ |
| 161 | if (event->parent) |
| 162 | event = event->parent; |
| 163 | |
| 164 | return task_tgid_nr_ns(p, event->ns); |
| 165 | } |
| 166 | |
| 167 | static u32 perf_event_tid(struct perf_event *event, struct task_struct *p) |
| 168 | { |
| 169 | /* |
| 170 | * only top level events have the pid namespace they were created in |
| 171 | */ |
| 172 | if (event->parent) |
| 173 | event = event->parent; |
| 174 | |
| 175 | return task_pid_nr_ns(p, event->ns); |
| 176 | } |
| 177 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 178 | /* |
| 179 | * If we inherit events we want to return the parent event id |
| 180 | * to userspace. |
| 181 | */ |
| 182 | static u64 primary_event_id(struct perf_event *event) |
| 183 | { |
| 184 | u64 id = event->id; |
| 185 | |
| 186 | if (event->parent) |
| 187 | id = event->parent->id; |
| 188 | |
| 189 | return id; |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * Get the perf_event_context for a task and lock it. |
| 194 | * This has to cope with with the fact that until it is locked, |
| 195 | * the context could get moved to another task. |
| 196 | */ |
| 197 | static struct perf_event_context * |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 198 | 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] | 199 | { |
| 200 | struct perf_event_context *ctx; |
| 201 | |
| 202 | rcu_read_lock(); |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 203 | retry: |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 204 | ctx = rcu_dereference(task->perf_event_ctxp[ctxn]); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 205 | if (ctx) { |
| 206 | /* |
| 207 | * If this context is a clone of another, it might |
| 208 | * get swapped for another underneath us by |
| 209 | * perf_event_task_sched_out, though the |
| 210 | * rcu_read_lock() protects us from any context |
| 211 | * getting freed. Lock the context and check if it |
| 212 | * got swapped before we could get the lock, and retry |
| 213 | * if so. If we locked the right context, then it |
| 214 | * can't get swapped on us any more. |
| 215 | */ |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 216 | raw_spin_lock_irqsave(&ctx->lock, *flags); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 217 | if (ctx != rcu_dereference(task->perf_event_ctxp[ctxn])) { |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 218 | raw_spin_unlock_irqrestore(&ctx->lock, *flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 219 | goto retry; |
| 220 | } |
| 221 | |
| 222 | if (!atomic_inc_not_zero(&ctx->refcount)) { |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 223 | raw_spin_unlock_irqrestore(&ctx->lock, *flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 224 | ctx = NULL; |
| 225 | } |
| 226 | } |
| 227 | rcu_read_unlock(); |
| 228 | return ctx; |
| 229 | } |
| 230 | |
| 231 | /* |
| 232 | * Get the context for a task and increment its pin_count so it |
| 233 | * can't get swapped to another task. This also increments its |
| 234 | * reference count so that the context can't get freed. |
| 235 | */ |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 236 | static struct perf_event_context * |
| 237 | perf_pin_task_context(struct task_struct *task, int ctxn) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 238 | { |
| 239 | struct perf_event_context *ctx; |
| 240 | unsigned long flags; |
| 241 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 242 | ctx = perf_lock_task_context(task, ctxn, &flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 243 | if (ctx) { |
| 244 | ++ctx->pin_count; |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 245 | raw_spin_unlock_irqrestore(&ctx->lock, flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 246 | } |
| 247 | return ctx; |
| 248 | } |
| 249 | |
| 250 | static void perf_unpin_context(struct perf_event_context *ctx) |
| 251 | { |
| 252 | unsigned long flags; |
| 253 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 254 | raw_spin_lock_irqsave(&ctx->lock, flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 255 | --ctx->pin_count; |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 256 | raw_spin_unlock_irqrestore(&ctx->lock, flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 257 | put_ctx(ctx); |
| 258 | } |
| 259 | |
Peter Zijlstra | f67218c | 2009-11-23 11:37:27 +0100 | [diff] [blame] | 260 | /* |
| 261 | * Update the record of the current time in a context. |
| 262 | */ |
| 263 | static void update_context_time(struct perf_event_context *ctx) |
| 264 | { |
| 265 | u64 now = perf_clock(); |
| 266 | |
| 267 | ctx->time += now - ctx->timestamp; |
| 268 | ctx->timestamp = now; |
| 269 | } |
| 270 | |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 271 | static u64 perf_event_time(struct perf_event *event) |
| 272 | { |
| 273 | struct perf_event_context *ctx = event->ctx; |
| 274 | return ctx ? ctx->time : 0; |
| 275 | } |
| 276 | |
Peter Zijlstra | f67218c | 2009-11-23 11:37:27 +0100 | [diff] [blame] | 277 | /* |
| 278 | * Update the total_time_enabled and total_time_running fields for a event. |
| 279 | */ |
| 280 | static void update_event_times(struct perf_event *event) |
| 281 | { |
| 282 | struct perf_event_context *ctx = event->ctx; |
| 283 | u64 run_end; |
| 284 | |
| 285 | if (event->state < PERF_EVENT_STATE_INACTIVE || |
| 286 | event->group_leader->state < PERF_EVENT_STATE_INACTIVE) |
| 287 | return; |
| 288 | |
Peter Zijlstra | acd1d7c | 2009-11-23 15:00:36 +0100 | [diff] [blame] | 289 | if (ctx->is_active) |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 290 | run_end = perf_event_time(event); |
Peter Zijlstra | acd1d7c | 2009-11-23 15:00:36 +0100 | [diff] [blame] | 291 | else |
| 292 | run_end = event->tstamp_stopped; |
| 293 | |
| 294 | event->total_time_enabled = run_end - event->tstamp_enabled; |
Peter Zijlstra | f67218c | 2009-11-23 11:37:27 +0100 | [diff] [blame] | 295 | |
| 296 | if (event->state == PERF_EVENT_STATE_INACTIVE) |
| 297 | run_end = event->tstamp_stopped; |
| 298 | else |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 299 | run_end = perf_event_time(event); |
Peter Zijlstra | f67218c | 2009-11-23 11:37:27 +0100 | [diff] [blame] | 300 | |
| 301 | event->total_time_running = run_end - event->tstamp_running; |
| 302 | } |
| 303 | |
Peter Zijlstra | 96c21a4 | 2010-05-11 16:19:10 +0200 | [diff] [blame] | 304 | /* |
| 305 | * Update total_time_enabled and total_time_running for all events in a group. |
| 306 | */ |
| 307 | static void update_group_times(struct perf_event *leader) |
| 308 | { |
| 309 | struct perf_event *event; |
| 310 | |
| 311 | update_event_times(leader); |
| 312 | list_for_each_entry(event, &leader->sibling_list, group_entry) |
| 313 | update_event_times(event); |
| 314 | } |
| 315 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 316 | static struct list_head * |
| 317 | ctx_group_list(struct perf_event *event, struct perf_event_context *ctx) |
| 318 | { |
| 319 | if (event->attr.pinned) |
| 320 | return &ctx->pinned_groups; |
| 321 | else |
| 322 | return &ctx->flexible_groups; |
| 323 | } |
| 324 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 325 | /* |
| 326 | * Add a event from the lists for its context. |
| 327 | * Must be called with ctx->mutex and ctx->lock held. |
| 328 | */ |
| 329 | static void |
| 330 | list_add_event(struct perf_event *event, struct perf_event_context *ctx) |
| 331 | { |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 332 | WARN_ON_ONCE(event->attach_state & PERF_ATTACH_CONTEXT); |
| 333 | event->attach_state |= PERF_ATTACH_CONTEXT; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 334 | |
| 335 | /* |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 336 | * If we're a stand alone event or group leader, we go to the context |
| 337 | * list, group events are kept attached to the group so that |
| 338 | * perf_group_detach can, at all times, locate all siblings. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 339 | */ |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 340 | if (event->group_leader == event) { |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 341 | struct list_head *list; |
| 342 | |
Frederic Weisbecker | d6f962b | 2010-01-10 01:25:51 +0100 | [diff] [blame] | 343 | if (is_software_event(event)) |
| 344 | event->group_flags |= PERF_GROUP_SOFTWARE; |
| 345 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 346 | list = ctx_group_list(event, ctx); |
| 347 | list_add_tail(&event->group_entry, list); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 348 | } |
| 349 | |
| 350 | list_add_rcu(&event->event_entry, &ctx->event_list); |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 351 | if (!ctx->nr_events) |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 352 | perf_pmu_rotate_start(ctx->pmu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 353 | ctx->nr_events++; |
| 354 | if (event->attr.inherit_stat) |
| 355 | ctx->nr_stat++; |
| 356 | } |
| 357 | |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 358 | /* |
| 359 | * Called at perf_event creation and when events are attached/detached from a |
| 360 | * group. |
| 361 | */ |
| 362 | static void perf_event__read_size(struct perf_event *event) |
| 363 | { |
| 364 | int entry = sizeof(u64); /* value */ |
| 365 | int size = 0; |
| 366 | int nr = 1; |
| 367 | |
| 368 | if (event->attr.read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) |
| 369 | size += sizeof(u64); |
| 370 | |
| 371 | if (event->attr.read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) |
| 372 | size += sizeof(u64); |
| 373 | |
| 374 | if (event->attr.read_format & PERF_FORMAT_ID) |
| 375 | entry += sizeof(u64); |
| 376 | |
| 377 | if (event->attr.read_format & PERF_FORMAT_GROUP) { |
| 378 | nr += event->group_leader->nr_siblings; |
| 379 | size += sizeof(u64); |
| 380 | } |
| 381 | |
| 382 | size += entry * nr; |
| 383 | event->read_size = size; |
| 384 | } |
| 385 | |
| 386 | static void perf_event__header_size(struct perf_event *event) |
| 387 | { |
| 388 | struct perf_sample_data *data; |
| 389 | u64 sample_type = event->attr.sample_type; |
| 390 | u16 size = 0; |
| 391 | |
| 392 | perf_event__read_size(event); |
| 393 | |
| 394 | if (sample_type & PERF_SAMPLE_IP) |
| 395 | size += sizeof(data->ip); |
| 396 | |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 397 | if (sample_type & PERF_SAMPLE_ADDR) |
| 398 | size += sizeof(data->addr); |
| 399 | |
| 400 | if (sample_type & PERF_SAMPLE_PERIOD) |
| 401 | size += sizeof(data->period); |
| 402 | |
| 403 | if (sample_type & PERF_SAMPLE_READ) |
| 404 | size += event->read_size; |
| 405 | |
| 406 | event->header_size = size; |
| 407 | } |
| 408 | |
| 409 | static void perf_event__id_header_size(struct perf_event *event) |
| 410 | { |
| 411 | struct perf_sample_data *data; |
| 412 | u64 sample_type = event->attr.sample_type; |
| 413 | u16 size = 0; |
| 414 | |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 415 | if (sample_type & PERF_SAMPLE_TID) |
| 416 | size += sizeof(data->tid_entry); |
| 417 | |
| 418 | if (sample_type & PERF_SAMPLE_TIME) |
| 419 | size += sizeof(data->time); |
| 420 | |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 421 | if (sample_type & PERF_SAMPLE_ID) |
| 422 | size += sizeof(data->id); |
| 423 | |
| 424 | if (sample_type & PERF_SAMPLE_STREAM_ID) |
| 425 | size += sizeof(data->stream_id); |
| 426 | |
| 427 | if (sample_type & PERF_SAMPLE_CPU) |
| 428 | size += sizeof(data->cpu_entry); |
| 429 | |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 430 | event->id_header_size = size; |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 431 | } |
| 432 | |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 433 | static void perf_group_attach(struct perf_event *event) |
| 434 | { |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 435 | struct perf_event *group_leader = event->group_leader, *pos; |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 436 | |
Peter Zijlstra | 74c3337 | 2010-10-15 11:40:29 +0200 | [diff] [blame] | 437 | /* |
| 438 | * We can have double attach due to group movement in perf_event_open. |
| 439 | */ |
| 440 | if (event->attach_state & PERF_ATTACH_GROUP) |
| 441 | return; |
| 442 | |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 443 | event->attach_state |= PERF_ATTACH_GROUP; |
| 444 | |
| 445 | if (group_leader == event) |
| 446 | return; |
| 447 | |
| 448 | if (group_leader->group_flags & PERF_GROUP_SOFTWARE && |
| 449 | !is_software_event(event)) |
| 450 | group_leader->group_flags &= ~PERF_GROUP_SOFTWARE; |
| 451 | |
| 452 | list_add_tail(&event->group_entry, &group_leader->sibling_list); |
| 453 | group_leader->nr_siblings++; |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 454 | |
| 455 | perf_event__header_size(group_leader); |
| 456 | |
| 457 | list_for_each_entry(pos, &group_leader->sibling_list, group_entry) |
| 458 | perf_event__header_size(pos); |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 459 | } |
| 460 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 461 | /* |
| 462 | * Remove a event from the lists for its context. |
| 463 | * Must be called with ctx->mutex and ctx->lock held. |
| 464 | */ |
| 465 | static void |
| 466 | list_del_event(struct perf_event *event, struct perf_event_context *ctx) |
| 467 | { |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 468 | /* |
| 469 | * We can have double detach due to exit/hot-unplug + close. |
| 470 | */ |
| 471 | if (!(event->attach_state & PERF_ATTACH_CONTEXT)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 472 | return; |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 473 | |
| 474 | event->attach_state &= ~PERF_ATTACH_CONTEXT; |
| 475 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 476 | ctx->nr_events--; |
| 477 | if (event->attr.inherit_stat) |
| 478 | ctx->nr_stat--; |
| 479 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 480 | list_del_rcu(&event->event_entry); |
| 481 | |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 482 | if (event->group_leader == event) |
| 483 | list_del_init(&event->group_entry); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 484 | |
Peter Zijlstra | 96c21a4 | 2010-05-11 16:19:10 +0200 | [diff] [blame] | 485 | update_group_times(event); |
Stephane Eranian | b2e74a2 | 2009-11-26 09:24:30 -0800 | [diff] [blame] | 486 | |
| 487 | /* |
| 488 | * If event was in error state, then keep it |
| 489 | * that way, otherwise bogus counts will be |
| 490 | * returned on read(). The only way to get out |
| 491 | * of error state is by explicit re-enabling |
| 492 | * of the event |
| 493 | */ |
| 494 | if (event->state > PERF_EVENT_STATE_OFF) |
| 495 | event->state = PERF_EVENT_STATE_OFF; |
Peter Zijlstra | 050735b | 2010-05-11 11:51:53 +0200 | [diff] [blame] | 496 | } |
| 497 | |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 498 | static void perf_group_detach(struct perf_event *event) |
Peter Zijlstra | 050735b | 2010-05-11 11:51:53 +0200 | [diff] [blame] | 499 | { |
| 500 | struct perf_event *sibling, *tmp; |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 501 | struct list_head *list = NULL; |
| 502 | |
| 503 | /* |
| 504 | * We can have double detach due to exit/hot-unplug + close. |
| 505 | */ |
| 506 | if (!(event->attach_state & PERF_ATTACH_GROUP)) |
| 507 | return; |
| 508 | |
| 509 | event->attach_state &= ~PERF_ATTACH_GROUP; |
| 510 | |
| 511 | /* |
| 512 | * If this is a sibling, remove it from its group. |
| 513 | */ |
| 514 | if (event->group_leader != event) { |
| 515 | list_del_init(&event->group_entry); |
| 516 | event->group_leader->nr_siblings--; |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 517 | goto out; |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 518 | } |
| 519 | |
| 520 | if (!list_empty(&event->group_entry)) |
| 521 | list = &event->group_entry; |
Peter Zijlstra | 2e2af50 | 2009-11-23 11:37:25 +0100 | [diff] [blame] | 522 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 523 | /* |
| 524 | * If this was a group event with sibling events then |
| 525 | * upgrade the siblings to singleton events by adding them |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 526 | * to whatever list we are on. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 527 | */ |
| 528 | list_for_each_entry_safe(sibling, tmp, &event->sibling_list, group_entry) { |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 529 | if (list) |
| 530 | list_move_tail(&sibling->group_entry, list); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 531 | sibling->group_leader = sibling; |
Frederic Weisbecker | d6f962b | 2010-01-10 01:25:51 +0100 | [diff] [blame] | 532 | |
| 533 | /* Inherit group flags from the previous leader */ |
| 534 | sibling->group_flags = event->group_flags; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 535 | } |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 536 | |
| 537 | out: |
| 538 | perf_event__header_size(event->group_leader); |
| 539 | |
| 540 | list_for_each_entry(tmp, &event->group_leader->sibling_list, group_entry) |
| 541 | perf_event__header_size(tmp); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 542 | } |
| 543 | |
Stephane Eranian | fa66f07 | 2010-08-26 16:40:01 +0200 | [diff] [blame] | 544 | static inline int |
| 545 | event_filter_match(struct perf_event *event) |
| 546 | { |
| 547 | return event->cpu == -1 || event->cpu == smp_processor_id(); |
| 548 | } |
| 549 | |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 550 | static void |
| 551 | event_sched_out(struct perf_event *event, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 552 | struct perf_cpu_context *cpuctx, |
| 553 | struct perf_event_context *ctx) |
| 554 | { |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 555 | u64 tstamp = perf_event_time(event); |
Stephane Eranian | fa66f07 | 2010-08-26 16:40:01 +0200 | [diff] [blame] | 556 | u64 delta; |
| 557 | /* |
| 558 | * An event which could not be activated because of |
| 559 | * filter mismatch still needs to have its timings |
| 560 | * maintained, otherwise bogus information is return |
| 561 | * via read() for time_enabled, time_running: |
| 562 | */ |
| 563 | if (event->state == PERF_EVENT_STATE_INACTIVE |
| 564 | && !event_filter_match(event)) { |
| 565 | delta = ctx->time - event->tstamp_stopped; |
| 566 | event->tstamp_running += delta; |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 567 | event->tstamp_stopped = tstamp; |
Stephane Eranian | fa66f07 | 2010-08-26 16:40:01 +0200 | [diff] [blame] | 568 | } |
| 569 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 570 | if (event->state != PERF_EVENT_STATE_ACTIVE) |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 571 | return; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 572 | |
| 573 | event->state = PERF_EVENT_STATE_INACTIVE; |
| 574 | if (event->pending_disable) { |
| 575 | event->pending_disable = 0; |
| 576 | event->state = PERF_EVENT_STATE_OFF; |
| 577 | } |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 578 | event->tstamp_stopped = tstamp; |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 579 | event->pmu->del(event, 0); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 580 | event->oncpu = -1; |
| 581 | |
| 582 | if (!is_software_event(event)) |
| 583 | cpuctx->active_oncpu--; |
| 584 | ctx->nr_active--; |
| 585 | if (event->attr.exclusive || !cpuctx->active_oncpu) |
| 586 | cpuctx->exclusive = 0; |
| 587 | } |
| 588 | |
| 589 | static void |
| 590 | group_sched_out(struct perf_event *group_event, |
| 591 | struct perf_cpu_context *cpuctx, |
| 592 | struct perf_event_context *ctx) |
| 593 | { |
| 594 | struct perf_event *event; |
Stephane Eranian | fa66f07 | 2010-08-26 16:40:01 +0200 | [diff] [blame] | 595 | int state = group_event->state; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 596 | |
| 597 | event_sched_out(group_event, cpuctx, ctx); |
| 598 | |
| 599 | /* |
| 600 | * Schedule out siblings (if any): |
| 601 | */ |
| 602 | list_for_each_entry(event, &group_event->sibling_list, group_entry) |
| 603 | event_sched_out(event, cpuctx, ctx); |
| 604 | |
Stephane Eranian | fa66f07 | 2010-08-26 16:40:01 +0200 | [diff] [blame] | 605 | if (state == PERF_EVENT_STATE_ACTIVE && group_event->attr.exclusive) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 606 | cpuctx->exclusive = 0; |
| 607 | } |
| 608 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 609 | static inline struct perf_cpu_context * |
| 610 | __get_cpu_context(struct perf_event_context *ctx) |
| 611 | { |
| 612 | return this_cpu_ptr(ctx->pmu->pmu_cpu_context); |
| 613 | } |
| 614 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 615 | /* |
| 616 | * Cross CPU call to remove a performance event |
| 617 | * |
| 618 | * We disable the event on the hardware level first. After that we |
| 619 | * remove it from the context list. |
| 620 | */ |
| 621 | static void __perf_event_remove_from_context(void *info) |
| 622 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 623 | struct perf_event *event = info; |
| 624 | struct perf_event_context *ctx = event->ctx; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 625 | struct perf_cpu_context *cpuctx = __get_cpu_context(ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 626 | |
| 627 | /* |
| 628 | * If this is a task context, we need to check whether it is |
| 629 | * the current task context of this cpu. If not it has been |
| 630 | * scheduled out before the smp call arrived. |
| 631 | */ |
| 632 | if (ctx->task && cpuctx->task_ctx != ctx) |
| 633 | return; |
| 634 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 635 | raw_spin_lock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 636 | |
| 637 | event_sched_out(event, cpuctx, ctx); |
| 638 | |
| 639 | list_del_event(event, ctx); |
| 640 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 641 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 642 | } |
| 643 | |
| 644 | |
| 645 | /* |
| 646 | * Remove the event from a task's (or a CPU's) list of events. |
| 647 | * |
| 648 | * Must be called with ctx->mutex held. |
| 649 | * |
| 650 | * CPU events are removed with a smp call. For task events we only |
| 651 | * call when the task is on a CPU. |
| 652 | * |
| 653 | * If event->ctx is a cloned context, callers must make sure that |
| 654 | * every task struct that event->ctx->task could possibly point to |
| 655 | * remains valid. This is OK when called from perf_release since |
| 656 | * that only calls us on the top-level context, which can't be a clone. |
| 657 | * When called from perf_event_exit_task, it's OK because the |
| 658 | * context has been detached from its task. |
| 659 | */ |
| 660 | static void perf_event_remove_from_context(struct perf_event *event) |
| 661 | { |
| 662 | struct perf_event_context *ctx = event->ctx; |
| 663 | struct task_struct *task = ctx->task; |
| 664 | |
| 665 | if (!task) { |
| 666 | /* |
| 667 | * Per cpu events are removed via an smp call and |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 668 | * the removal is always successful. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 669 | */ |
| 670 | smp_call_function_single(event->cpu, |
| 671 | __perf_event_remove_from_context, |
| 672 | event, 1); |
| 673 | return; |
| 674 | } |
| 675 | |
| 676 | retry: |
| 677 | task_oncpu_function_call(task, __perf_event_remove_from_context, |
| 678 | event); |
| 679 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 680 | raw_spin_lock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 681 | /* |
| 682 | * If the context is active we need to retry the smp call. |
| 683 | */ |
| 684 | if (ctx->nr_active && !list_empty(&event->group_entry)) { |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 685 | raw_spin_unlock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 686 | goto retry; |
| 687 | } |
| 688 | |
| 689 | /* |
| 690 | * The lock prevents that this context is scheduled in so we |
| 691 | * can remove the event safely, if the call above did not |
| 692 | * succeed. |
| 693 | */ |
Peter Zijlstra | 6c2bfcb | 2009-11-23 11:37:24 +0100 | [diff] [blame] | 694 | if (!list_empty(&event->group_entry)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 695 | list_del_event(event, ctx); |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 696 | raw_spin_unlock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 697 | } |
| 698 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 699 | /* |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 700 | * Cross CPU call to disable a performance event |
| 701 | */ |
| 702 | static void __perf_event_disable(void *info) |
| 703 | { |
| 704 | struct perf_event *event = info; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 705 | struct perf_event_context *ctx = event->ctx; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 706 | struct perf_cpu_context *cpuctx = __get_cpu_context(ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 707 | |
| 708 | /* |
| 709 | * If this is a per-task event, need to check whether this |
| 710 | * event's task is the current task on this cpu. |
| 711 | */ |
| 712 | if (ctx->task && cpuctx->task_ctx != ctx) |
| 713 | return; |
| 714 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 715 | raw_spin_lock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 716 | |
| 717 | /* |
| 718 | * If the event is on, turn it off. |
| 719 | * If it is in error state, leave it in error state. |
| 720 | */ |
| 721 | if (event->state >= PERF_EVENT_STATE_INACTIVE) { |
| 722 | update_context_time(ctx); |
| 723 | update_group_times(event); |
| 724 | if (event == event->group_leader) |
| 725 | group_sched_out(event, cpuctx, ctx); |
| 726 | else |
| 727 | event_sched_out(event, cpuctx, ctx); |
| 728 | event->state = PERF_EVENT_STATE_OFF; |
| 729 | } |
| 730 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 731 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 732 | } |
| 733 | |
| 734 | /* |
| 735 | * Disable a event. |
| 736 | * |
| 737 | * If event->ctx is a cloned context, callers must make sure that |
| 738 | * every task struct that event->ctx->task could possibly point to |
| 739 | * remains valid. This condition is satisifed when called through |
| 740 | * perf_event_for_each_child or perf_event_for_each because they |
| 741 | * hold the top-level event's child_mutex, so any descendant that |
| 742 | * goes to exit will block in sync_child_event. |
| 743 | * When called from perf_pending_event it's OK because event->ctx |
| 744 | * is the current context on this CPU and preemption is disabled, |
| 745 | * hence we can't get into perf_event_task_sched_out for this context. |
| 746 | */ |
Frederic Weisbecker | 44234ad | 2009-12-09 09:25:48 +0100 | [diff] [blame] | 747 | void perf_event_disable(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 748 | { |
| 749 | struct perf_event_context *ctx = event->ctx; |
| 750 | struct task_struct *task = ctx->task; |
| 751 | |
| 752 | if (!task) { |
| 753 | /* |
| 754 | * Disable the event on the cpu that it's on |
| 755 | */ |
| 756 | smp_call_function_single(event->cpu, __perf_event_disable, |
| 757 | event, 1); |
| 758 | return; |
| 759 | } |
| 760 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 761 | retry: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 762 | task_oncpu_function_call(task, __perf_event_disable, event); |
| 763 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 764 | raw_spin_lock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 765 | /* |
| 766 | * If the event is still active, we need to retry the cross-call. |
| 767 | */ |
| 768 | if (event->state == PERF_EVENT_STATE_ACTIVE) { |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 769 | raw_spin_unlock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 770 | goto retry; |
| 771 | } |
| 772 | |
| 773 | /* |
| 774 | * Since we have the lock this context can't be scheduled |
| 775 | * in, so we can change the state safely. |
| 776 | */ |
| 777 | if (event->state == PERF_EVENT_STATE_INACTIVE) { |
| 778 | update_group_times(event); |
| 779 | event->state = PERF_EVENT_STATE_OFF; |
| 780 | } |
| 781 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 782 | raw_spin_unlock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 783 | } |
| 784 | |
| 785 | static int |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 786 | event_sched_in(struct perf_event *event, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 787 | struct perf_cpu_context *cpuctx, |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 788 | struct perf_event_context *ctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 789 | { |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 790 | u64 tstamp = perf_event_time(event); |
| 791 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 792 | if (event->state <= PERF_EVENT_STATE_OFF) |
| 793 | return 0; |
| 794 | |
| 795 | event->state = PERF_EVENT_STATE_ACTIVE; |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 796 | event->oncpu = smp_processor_id(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 797 | /* |
| 798 | * The new state must be visible before we turn it on in the hardware: |
| 799 | */ |
| 800 | smp_wmb(); |
| 801 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 802 | if (event->pmu->add(event, PERF_EF_START)) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 803 | event->state = PERF_EVENT_STATE_INACTIVE; |
| 804 | event->oncpu = -1; |
| 805 | return -EAGAIN; |
| 806 | } |
| 807 | |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 808 | event->tstamp_running += tstamp - event->tstamp_stopped; |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 809 | |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 810 | event->shadow_ctx_time = tstamp - ctx->timestamp; |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 811 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 812 | if (!is_software_event(event)) |
| 813 | cpuctx->active_oncpu++; |
| 814 | ctx->nr_active++; |
| 815 | |
| 816 | if (event->attr.exclusive) |
| 817 | cpuctx->exclusive = 1; |
| 818 | |
| 819 | return 0; |
| 820 | } |
| 821 | |
| 822 | static int |
| 823 | group_sched_in(struct perf_event *group_event, |
| 824 | struct perf_cpu_context *cpuctx, |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 825 | struct perf_event_context *ctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 826 | { |
Lin Ming | 6bde9b6 | 2010-04-23 13:56:00 +0800 | [diff] [blame] | 827 | struct perf_event *event, *partial_group = NULL; |
Peter Zijlstra | 51b0fe3 | 2010-06-11 13:35:57 +0200 | [diff] [blame] | 828 | struct pmu *pmu = group_event->pmu; |
Stephane Eranian | d7842da | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 829 | u64 now = ctx->time; |
| 830 | bool simulate = false; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 831 | |
| 832 | if (group_event->state == PERF_EVENT_STATE_OFF) |
| 833 | return 0; |
| 834 | |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 835 | pmu->start_txn(pmu); |
Lin Ming | 6bde9b6 | 2010-04-23 13:56:00 +0800 | [diff] [blame] | 836 | |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 837 | if (event_sched_in(group_event, cpuctx, ctx)) { |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 838 | pmu->cancel_txn(pmu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 839 | return -EAGAIN; |
Stephane Eranian | 90151c35 | 2010-05-25 16:23:10 +0200 | [diff] [blame] | 840 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 841 | |
| 842 | /* |
| 843 | * Schedule in siblings as one group (if any): |
| 844 | */ |
| 845 | list_for_each_entry(event, &group_event->sibling_list, group_entry) { |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 846 | if (event_sched_in(event, cpuctx, ctx)) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 847 | partial_group = event; |
| 848 | goto group_error; |
| 849 | } |
| 850 | } |
| 851 | |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 852 | if (!pmu->commit_txn(pmu)) |
Paul Mackerras | 6e85158 | 2010-05-08 20:58:00 +1000 | [diff] [blame] | 853 | return 0; |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 854 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 855 | group_error: |
| 856 | /* |
| 857 | * Groups can be scheduled in as one unit only, so undo any |
| 858 | * partial group before returning: |
Stephane Eranian | d7842da | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 859 | * The events up to the failed event are scheduled out normally, |
| 860 | * tstamp_stopped will be updated. |
| 861 | * |
| 862 | * The failed events and the remaining siblings need to have |
| 863 | * their timings updated as if they had gone thru event_sched_in() |
| 864 | * and event_sched_out(). This is required to get consistent timings |
| 865 | * across the group. This also takes care of the case where the group |
| 866 | * could never be scheduled by ensuring tstamp_stopped is set to mark |
| 867 | * the time the event was actually stopped, such that time delta |
| 868 | * calculation in update_event_times() is correct. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 869 | */ |
| 870 | list_for_each_entry(event, &group_event->sibling_list, group_entry) { |
| 871 | if (event == partial_group) |
Stephane Eranian | d7842da | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 872 | simulate = true; |
| 873 | |
| 874 | if (simulate) { |
| 875 | event->tstamp_running += now - event->tstamp_stopped; |
| 876 | event->tstamp_stopped = now; |
| 877 | } else { |
| 878 | event_sched_out(event, cpuctx, ctx); |
| 879 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 880 | } |
Stephane Eranian | 9ffcfa6 | 2010-10-20 15:25:01 +0200 | [diff] [blame] | 881 | event_sched_out(group_event, cpuctx, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 882 | |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 883 | pmu->cancel_txn(pmu); |
Stephane Eranian | 90151c35 | 2010-05-25 16:23:10 +0200 | [diff] [blame] | 884 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 885 | return -EAGAIN; |
| 886 | } |
| 887 | |
| 888 | /* |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 889 | * Work out whether we can put this event group on the CPU now. |
| 890 | */ |
| 891 | static int group_can_go_on(struct perf_event *event, |
| 892 | struct perf_cpu_context *cpuctx, |
| 893 | int can_add_hw) |
| 894 | { |
| 895 | /* |
| 896 | * Groups consisting entirely of software events can always go on. |
| 897 | */ |
Frederic Weisbecker | d6f962b | 2010-01-10 01:25:51 +0100 | [diff] [blame] | 898 | if (event->group_flags & PERF_GROUP_SOFTWARE) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 899 | return 1; |
| 900 | /* |
| 901 | * If an exclusive group is already on, no other hardware |
| 902 | * events can go on. |
| 903 | */ |
| 904 | if (cpuctx->exclusive) |
| 905 | return 0; |
| 906 | /* |
| 907 | * If this group is exclusive and there are already |
| 908 | * events on the CPU, it can't go on. |
| 909 | */ |
| 910 | if (event->attr.exclusive && cpuctx->active_oncpu) |
| 911 | return 0; |
| 912 | /* |
| 913 | * Otherwise, try to add it if all previous groups were able |
| 914 | * to go on. |
| 915 | */ |
| 916 | return can_add_hw; |
| 917 | } |
| 918 | |
| 919 | static void add_event_to_ctx(struct perf_event *event, |
| 920 | struct perf_event_context *ctx) |
| 921 | { |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 922 | u64 tstamp = perf_event_time(event); |
| 923 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 924 | list_add_event(event, ctx); |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 925 | perf_group_attach(event); |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 926 | event->tstamp_enabled = tstamp; |
| 927 | event->tstamp_running = tstamp; |
| 928 | event->tstamp_stopped = tstamp; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 929 | } |
| 930 | |
| 931 | /* |
| 932 | * Cross CPU call to install and enable a performance event |
| 933 | * |
| 934 | * Must be called with ctx->mutex held |
| 935 | */ |
| 936 | static void __perf_install_in_context(void *info) |
| 937 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 938 | struct perf_event *event = info; |
| 939 | struct perf_event_context *ctx = event->ctx; |
| 940 | struct perf_event *leader = event->group_leader; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 941 | struct perf_cpu_context *cpuctx = __get_cpu_context(ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 942 | int err; |
| 943 | |
| 944 | /* |
| 945 | * If this is a task context, we need to check whether it is |
| 946 | * the current task context of this cpu. If not it has been |
| 947 | * scheduled out before the smp call arrived. |
| 948 | * Or possibly this is the right context but it isn't |
| 949 | * on this cpu because it had no events. |
| 950 | */ |
| 951 | if (ctx->task && cpuctx->task_ctx != ctx) { |
| 952 | if (cpuctx->task_ctx || ctx->task != current) |
| 953 | return; |
| 954 | cpuctx->task_ctx = ctx; |
| 955 | } |
| 956 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 957 | raw_spin_lock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 958 | ctx->is_active = 1; |
| 959 | update_context_time(ctx); |
| 960 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 961 | add_event_to_ctx(event, ctx); |
| 962 | |
Stephane Eranian | 5632ab1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 963 | if (!event_filter_match(event)) |
Peter Zijlstra | f4c4176 | 2009-12-16 17:55:54 +0100 | [diff] [blame] | 964 | goto unlock; |
| 965 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 966 | /* |
| 967 | * Don't put the event on if it is disabled or if |
| 968 | * it is in a group and the group isn't on. |
| 969 | */ |
| 970 | if (event->state != PERF_EVENT_STATE_INACTIVE || |
| 971 | (leader != event && leader->state != PERF_EVENT_STATE_ACTIVE)) |
| 972 | goto unlock; |
| 973 | |
| 974 | /* |
| 975 | * An exclusive event can't go on if there are already active |
| 976 | * hardware events, and no hardware event can go on if there |
| 977 | * is already an exclusive event on. |
| 978 | */ |
| 979 | if (!group_can_go_on(event, cpuctx, 1)) |
| 980 | err = -EEXIST; |
| 981 | else |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 982 | err = event_sched_in(event, cpuctx, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 983 | |
| 984 | if (err) { |
| 985 | /* |
| 986 | * This event couldn't go on. If it is in a group |
| 987 | * then we have to pull the whole group off. |
| 988 | * If the event group is pinned then put it in error state. |
| 989 | */ |
| 990 | if (leader != event) |
| 991 | group_sched_out(leader, cpuctx, ctx); |
| 992 | if (leader->attr.pinned) { |
| 993 | update_group_times(leader); |
| 994 | leader->state = PERF_EVENT_STATE_ERROR; |
| 995 | } |
| 996 | } |
| 997 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 998 | unlock: |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 999 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1000 | } |
| 1001 | |
| 1002 | /* |
| 1003 | * Attach a performance event to a context |
| 1004 | * |
| 1005 | * First we add the event to the list with the hardware enable bit |
| 1006 | * in event->hw_config cleared. |
| 1007 | * |
| 1008 | * If the event is attached to a task which is on a CPU we use a smp |
| 1009 | * call to enable it in the task context. The task might have been |
| 1010 | * scheduled away, but we check this in the smp call again. |
| 1011 | * |
| 1012 | * Must be called with ctx->mutex held. |
| 1013 | */ |
| 1014 | static void |
| 1015 | perf_install_in_context(struct perf_event_context *ctx, |
| 1016 | struct perf_event *event, |
| 1017 | int cpu) |
| 1018 | { |
| 1019 | struct task_struct *task = ctx->task; |
| 1020 | |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 1021 | event->ctx = ctx; |
| 1022 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1023 | if (!task) { |
| 1024 | /* |
| 1025 | * Per cpu events are installed via an smp call and |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 1026 | * the install is always successful. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1027 | */ |
| 1028 | smp_call_function_single(cpu, __perf_install_in_context, |
| 1029 | event, 1); |
| 1030 | return; |
| 1031 | } |
| 1032 | |
| 1033 | retry: |
| 1034 | task_oncpu_function_call(task, __perf_install_in_context, |
| 1035 | event); |
| 1036 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1037 | raw_spin_lock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1038 | /* |
| 1039 | * we need to retry the smp call. |
| 1040 | */ |
| 1041 | if (ctx->is_active && list_empty(&event->group_entry)) { |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1042 | raw_spin_unlock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1043 | goto retry; |
| 1044 | } |
| 1045 | |
| 1046 | /* |
| 1047 | * The lock prevents that this context is scheduled in so we |
| 1048 | * can add the event safely, if it the call above did not |
| 1049 | * succeed. |
| 1050 | */ |
| 1051 | if (list_empty(&event->group_entry)) |
| 1052 | add_event_to_ctx(event, ctx); |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1053 | raw_spin_unlock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1054 | } |
| 1055 | |
| 1056 | /* |
| 1057 | * Put a event into inactive state and update time fields. |
| 1058 | * Enabling the leader of a group effectively enables all |
| 1059 | * the group members that aren't explicitly disabled, so we |
| 1060 | * have to update their ->tstamp_enabled also. |
| 1061 | * Note: this works for group members as well as group leaders |
| 1062 | * since the non-leader members' sibling_lists will be empty. |
| 1063 | */ |
| 1064 | static void __perf_event_mark_enabled(struct perf_event *event, |
| 1065 | struct perf_event_context *ctx) |
| 1066 | { |
| 1067 | struct perf_event *sub; |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1068 | u64 tstamp = perf_event_time(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1069 | |
| 1070 | event->state = PERF_EVENT_STATE_INACTIVE; |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1071 | event->tstamp_enabled = tstamp - event->total_time_enabled; |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1072 | list_for_each_entry(sub, &event->sibling_list, group_entry) { |
Stephane Eranian | 4158755 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1073 | if (sub->state >= PERF_EVENT_STATE_INACTIVE) |
| 1074 | sub->tstamp_enabled = tstamp - sub->total_time_enabled; |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1075 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1076 | } |
| 1077 | |
| 1078 | /* |
| 1079 | * Cross CPU call to enable a performance event |
| 1080 | */ |
| 1081 | static void __perf_event_enable(void *info) |
| 1082 | { |
| 1083 | struct perf_event *event = info; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1084 | struct perf_event_context *ctx = event->ctx; |
| 1085 | struct perf_event *leader = event->group_leader; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 1086 | struct perf_cpu_context *cpuctx = __get_cpu_context(ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1087 | int err; |
| 1088 | |
| 1089 | /* |
| 1090 | * If this is a per-task event, need to check whether this |
| 1091 | * event's task is the current task on this cpu. |
| 1092 | */ |
| 1093 | if (ctx->task && cpuctx->task_ctx != ctx) { |
| 1094 | if (cpuctx->task_ctx || ctx->task != current) |
| 1095 | return; |
| 1096 | cpuctx->task_ctx = ctx; |
| 1097 | } |
| 1098 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1099 | raw_spin_lock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1100 | ctx->is_active = 1; |
| 1101 | update_context_time(ctx); |
| 1102 | |
| 1103 | if (event->state >= PERF_EVENT_STATE_INACTIVE) |
| 1104 | goto unlock; |
| 1105 | __perf_event_mark_enabled(event, ctx); |
| 1106 | |
Stephane Eranian | 5632ab1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1107 | if (!event_filter_match(event)) |
Peter Zijlstra | f4c4176 | 2009-12-16 17:55:54 +0100 | [diff] [blame] | 1108 | goto unlock; |
| 1109 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1110 | /* |
| 1111 | * If the event is in a group and isn't the group leader, |
| 1112 | * then don't put it on unless the group is on. |
| 1113 | */ |
| 1114 | if (leader != event && leader->state != PERF_EVENT_STATE_ACTIVE) |
| 1115 | goto unlock; |
| 1116 | |
| 1117 | if (!group_can_go_on(event, cpuctx, 1)) { |
| 1118 | err = -EEXIST; |
| 1119 | } else { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1120 | if (event == leader) |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 1121 | err = group_sched_in(event, cpuctx, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1122 | else |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 1123 | err = event_sched_in(event, cpuctx, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1124 | } |
| 1125 | |
| 1126 | if (err) { |
| 1127 | /* |
| 1128 | * If this event can't go on and it's part of a |
| 1129 | * group, then the whole group has to come off. |
| 1130 | */ |
| 1131 | if (leader != event) |
| 1132 | group_sched_out(leader, cpuctx, ctx); |
| 1133 | if (leader->attr.pinned) { |
| 1134 | update_group_times(leader); |
| 1135 | leader->state = PERF_EVENT_STATE_ERROR; |
| 1136 | } |
| 1137 | } |
| 1138 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1139 | unlock: |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1140 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1141 | } |
| 1142 | |
| 1143 | /* |
| 1144 | * Enable a event. |
| 1145 | * |
| 1146 | * If event->ctx is a cloned context, callers must make sure that |
| 1147 | * every task struct that event->ctx->task could possibly point to |
| 1148 | * remains valid. This condition is satisfied when called through |
| 1149 | * perf_event_for_each_child or perf_event_for_each as described |
| 1150 | * for perf_event_disable. |
| 1151 | */ |
Frederic Weisbecker | 44234ad | 2009-12-09 09:25:48 +0100 | [diff] [blame] | 1152 | void perf_event_enable(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1153 | { |
| 1154 | struct perf_event_context *ctx = event->ctx; |
| 1155 | struct task_struct *task = ctx->task; |
| 1156 | |
| 1157 | if (!task) { |
| 1158 | /* |
| 1159 | * Enable the event on the cpu that it's on |
| 1160 | */ |
| 1161 | smp_call_function_single(event->cpu, __perf_event_enable, |
| 1162 | event, 1); |
| 1163 | return; |
| 1164 | } |
| 1165 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1166 | raw_spin_lock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1167 | if (event->state >= PERF_EVENT_STATE_INACTIVE) |
| 1168 | goto out; |
| 1169 | |
| 1170 | /* |
| 1171 | * If the event is in error state, clear that first. |
| 1172 | * That way, if we see the event in error state below, we |
| 1173 | * know that it has gone back into error state, as distinct |
| 1174 | * from the task having been scheduled away before the |
| 1175 | * cross-call arrived. |
| 1176 | */ |
| 1177 | if (event->state == PERF_EVENT_STATE_ERROR) |
| 1178 | event->state = PERF_EVENT_STATE_OFF; |
| 1179 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1180 | retry: |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1181 | raw_spin_unlock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1182 | task_oncpu_function_call(task, __perf_event_enable, event); |
| 1183 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1184 | raw_spin_lock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1185 | |
| 1186 | /* |
| 1187 | * If the context is active and the event is still off, |
| 1188 | * we need to retry the cross-call. |
| 1189 | */ |
| 1190 | if (ctx->is_active && event->state == PERF_EVENT_STATE_OFF) |
| 1191 | goto retry; |
| 1192 | |
| 1193 | /* |
| 1194 | * Since we have the lock this context can't be scheduled |
| 1195 | * in, so we can change the state safely. |
| 1196 | */ |
| 1197 | if (event->state == PERF_EVENT_STATE_OFF) |
| 1198 | __perf_event_mark_enabled(event, ctx); |
| 1199 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1200 | out: |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1201 | raw_spin_unlock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1202 | } |
| 1203 | |
| 1204 | static int perf_event_refresh(struct perf_event *event, int refresh) |
| 1205 | { |
| 1206 | /* |
| 1207 | * not supported on inherited events |
| 1208 | */ |
Franck Bui-Huu | 2e939d1 | 2010-11-23 16:21:44 +0100 | [diff] [blame] | 1209 | if (event->attr.inherit || !is_sampling_event(event)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1210 | return -EINVAL; |
| 1211 | |
| 1212 | atomic_add(refresh, &event->event_limit); |
| 1213 | perf_event_enable(event); |
| 1214 | |
| 1215 | return 0; |
| 1216 | } |
| 1217 | |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1218 | static void ctx_sched_out(struct perf_event_context *ctx, |
| 1219 | struct perf_cpu_context *cpuctx, |
| 1220 | enum event_type_t event_type) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1221 | { |
| 1222 | struct perf_event *event; |
| 1223 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1224 | raw_spin_lock(&ctx->lock); |
Peter Zijlstra | 1b9a644 | 2010-09-07 18:32:22 +0200 | [diff] [blame] | 1225 | perf_pmu_disable(ctx->pmu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1226 | ctx->is_active = 0; |
| 1227 | if (likely(!ctx->nr_events)) |
| 1228 | goto out; |
| 1229 | update_context_time(ctx); |
| 1230 | |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1231 | if (!ctx->nr_active) |
Peter Zijlstra | 24cd7f5 | 2010-06-11 17:32:03 +0200 | [diff] [blame] | 1232 | goto out; |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1233 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1234 | if (event_type & EVENT_PINNED) { |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 1235 | list_for_each_entry(event, &ctx->pinned_groups, group_entry) |
| 1236 | group_sched_out(event, cpuctx, ctx); |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1237 | } |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 1238 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1239 | if (event_type & EVENT_FLEXIBLE) { |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 1240 | list_for_each_entry(event, &ctx->flexible_groups, group_entry) |
Xiao Guangrong | 8c9ed8e | 2009-09-25 13:51:17 +0800 | [diff] [blame] | 1241 | group_sched_out(event, cpuctx, ctx); |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1242 | } |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1243 | out: |
Peter Zijlstra | 1b9a644 | 2010-09-07 18:32:22 +0200 | [diff] [blame] | 1244 | perf_pmu_enable(ctx->pmu); |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1245 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1246 | } |
| 1247 | |
| 1248 | /* |
| 1249 | * Test whether two contexts are equivalent, i.e. whether they |
| 1250 | * have both been cloned from the same version of the same context |
| 1251 | * and they both have the same number of enabled events. |
| 1252 | * If the number of enabled events is the same, then the set |
| 1253 | * of enabled events should be the same, because these are both |
| 1254 | * inherited contexts, therefore we can't access individual events |
| 1255 | * in them directly with an fd; we can only enable/disable all |
| 1256 | * events via prctl, or enable/disable all events in a family |
| 1257 | * via ioctl, which will have the same effect on both contexts. |
| 1258 | */ |
| 1259 | static int context_equiv(struct perf_event_context *ctx1, |
| 1260 | struct perf_event_context *ctx2) |
| 1261 | { |
| 1262 | return ctx1->parent_ctx && ctx1->parent_ctx == ctx2->parent_ctx |
| 1263 | && ctx1->parent_gen == ctx2->parent_gen |
| 1264 | && !ctx1->pin_count && !ctx2->pin_count; |
| 1265 | } |
| 1266 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1267 | static void __perf_event_sync_stat(struct perf_event *event, |
| 1268 | struct perf_event *next_event) |
| 1269 | { |
| 1270 | u64 value; |
| 1271 | |
| 1272 | if (!event->attr.inherit_stat) |
| 1273 | return; |
| 1274 | |
| 1275 | /* |
| 1276 | * Update the event value, we cannot use perf_event_read() |
| 1277 | * because we're in the middle of a context switch and have IRQs |
| 1278 | * disabled, which upsets smp_call_function_single(), however |
| 1279 | * we know the event must be on the current CPU, therefore we |
| 1280 | * don't need to use it. |
| 1281 | */ |
| 1282 | switch (event->state) { |
| 1283 | case PERF_EVENT_STATE_ACTIVE: |
Peter Zijlstra | 3dbebf1 | 2009-11-20 22:19:52 +0100 | [diff] [blame] | 1284 | event->pmu->read(event); |
| 1285 | /* fall-through */ |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1286 | |
| 1287 | case PERF_EVENT_STATE_INACTIVE: |
| 1288 | update_event_times(event); |
| 1289 | break; |
| 1290 | |
| 1291 | default: |
| 1292 | break; |
| 1293 | } |
| 1294 | |
| 1295 | /* |
| 1296 | * In order to keep per-task stats reliable we need to flip the event |
| 1297 | * values when we flip the contexts. |
| 1298 | */ |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 1299 | value = local64_read(&next_event->count); |
| 1300 | value = local64_xchg(&event->count, value); |
| 1301 | local64_set(&next_event->count, value); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1302 | |
| 1303 | swap(event->total_time_enabled, next_event->total_time_enabled); |
| 1304 | swap(event->total_time_running, next_event->total_time_running); |
| 1305 | |
| 1306 | /* |
| 1307 | * Since we swizzled the values, update the user visible data too. |
| 1308 | */ |
| 1309 | perf_event_update_userpage(event); |
| 1310 | perf_event_update_userpage(next_event); |
| 1311 | } |
| 1312 | |
| 1313 | #define list_next_entry(pos, member) \ |
| 1314 | list_entry(pos->member.next, typeof(*pos), member) |
| 1315 | |
| 1316 | static void perf_event_sync_stat(struct perf_event_context *ctx, |
| 1317 | struct perf_event_context *next_ctx) |
| 1318 | { |
| 1319 | struct perf_event *event, *next_event; |
| 1320 | |
| 1321 | if (!ctx->nr_stat) |
| 1322 | return; |
| 1323 | |
Peter Zijlstra | 02ffdbc | 2009-11-20 22:19:50 +0100 | [diff] [blame] | 1324 | update_context_time(ctx); |
| 1325 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1326 | event = list_first_entry(&ctx->event_list, |
| 1327 | struct perf_event, event_entry); |
| 1328 | |
| 1329 | next_event = list_first_entry(&next_ctx->event_list, |
| 1330 | struct perf_event, event_entry); |
| 1331 | |
| 1332 | while (&event->event_entry != &ctx->event_list && |
| 1333 | &next_event->event_entry != &next_ctx->event_list) { |
| 1334 | |
| 1335 | __perf_event_sync_stat(event, next_event); |
| 1336 | |
| 1337 | event = list_next_entry(event, event_entry); |
| 1338 | next_event = list_next_entry(next_event, event_entry); |
| 1339 | } |
| 1340 | } |
| 1341 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1342 | void perf_event_context_sched_out(struct task_struct *task, int ctxn, |
| 1343 | struct task_struct *next) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1344 | { |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1345 | struct perf_event_context *ctx = task->perf_event_ctxp[ctxn]; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1346 | struct perf_event_context *next_ctx; |
| 1347 | struct perf_event_context *parent; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 1348 | struct perf_cpu_context *cpuctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1349 | int do_switch = 1; |
| 1350 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 1351 | if (likely(!ctx)) |
| 1352 | return; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1353 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 1354 | cpuctx = __get_cpu_context(ctx); |
| 1355 | if (!cpuctx->task_ctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1356 | return; |
| 1357 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1358 | rcu_read_lock(); |
| 1359 | parent = rcu_dereference(ctx->parent_ctx); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1360 | next_ctx = next->perf_event_ctxp[ctxn]; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1361 | if (parent && next_ctx && |
| 1362 | rcu_dereference(next_ctx->parent_ctx) == parent) { |
| 1363 | /* |
| 1364 | * Looks like the two contexts are clones, so we might be |
| 1365 | * able to optimize the context switch. We lock both |
| 1366 | * contexts and check that they are clones under the |
| 1367 | * lock (including re-checking that neither has been |
| 1368 | * uncloned in the meantime). It doesn't matter which |
| 1369 | * order we take the locks because no other cpu could |
| 1370 | * be trying to lock both of these tasks. |
| 1371 | */ |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1372 | raw_spin_lock(&ctx->lock); |
| 1373 | raw_spin_lock_nested(&next_ctx->lock, SINGLE_DEPTH_NESTING); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1374 | if (context_equiv(ctx, next_ctx)) { |
| 1375 | /* |
| 1376 | * XXX do we need a memory barrier of sorts |
| 1377 | * wrt to rcu_dereference() of perf_event_ctxp |
| 1378 | */ |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1379 | task->perf_event_ctxp[ctxn] = next_ctx; |
| 1380 | next->perf_event_ctxp[ctxn] = ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1381 | ctx->task = next; |
| 1382 | next_ctx->task = task; |
| 1383 | do_switch = 0; |
| 1384 | |
| 1385 | perf_event_sync_stat(ctx, next_ctx); |
| 1386 | } |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1387 | raw_spin_unlock(&next_ctx->lock); |
| 1388 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1389 | } |
| 1390 | rcu_read_unlock(); |
| 1391 | |
| 1392 | if (do_switch) { |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1393 | ctx_sched_out(ctx, cpuctx, EVENT_ALL); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1394 | cpuctx->task_ctx = NULL; |
| 1395 | } |
| 1396 | } |
| 1397 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1398 | #define for_each_task_context_nr(ctxn) \ |
| 1399 | for ((ctxn) = 0; (ctxn) < perf_nr_task_contexts; (ctxn)++) |
| 1400 | |
| 1401 | /* |
| 1402 | * Called from scheduler to remove the events of the current task, |
| 1403 | * with interrupts disabled. |
| 1404 | * |
| 1405 | * We stop each event and update the event value in event->count. |
| 1406 | * |
| 1407 | * This does not protect us against NMI, but disable() |
| 1408 | * sets the disabled bit in the control field of event _before_ |
| 1409 | * accessing the event control register. If a NMI hits, then it will |
| 1410 | * not restart the event. |
| 1411 | */ |
Peter Zijlstra | 82cd6de | 2010-10-14 17:57:23 +0200 | [diff] [blame] | 1412 | void __perf_event_task_sched_out(struct task_struct *task, |
| 1413 | struct task_struct *next) |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1414 | { |
| 1415 | int ctxn; |
| 1416 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1417 | for_each_task_context_nr(ctxn) |
| 1418 | perf_event_context_sched_out(task, ctxn, next); |
| 1419 | } |
| 1420 | |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1421 | static void task_ctx_sched_out(struct perf_event_context *ctx, |
| 1422 | enum event_type_t event_type) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1423 | { |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 1424 | struct perf_cpu_context *cpuctx = __get_cpu_context(ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1425 | |
| 1426 | if (!cpuctx->task_ctx) |
| 1427 | return; |
| 1428 | |
| 1429 | if (WARN_ON_ONCE(ctx != cpuctx->task_ctx)) |
| 1430 | return; |
| 1431 | |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1432 | ctx_sched_out(ctx, cpuctx, event_type); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1433 | cpuctx->task_ctx = NULL; |
| 1434 | } |
| 1435 | |
| 1436 | /* |
| 1437 | * Called with IRQs disabled |
| 1438 | */ |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1439 | static void cpu_ctx_sched_out(struct perf_cpu_context *cpuctx, |
| 1440 | enum event_type_t event_type) |
| 1441 | { |
| 1442 | ctx_sched_out(&cpuctx->ctx, cpuctx, event_type); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1443 | } |
| 1444 | |
| 1445 | static void |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1446 | ctx_pinned_sched_in(struct perf_event_context *ctx, |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 1447 | struct perf_cpu_context *cpuctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1448 | { |
| 1449 | struct perf_event *event; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1450 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 1451 | list_for_each_entry(event, &ctx->pinned_groups, group_entry) { |
| 1452 | if (event->state <= PERF_EVENT_STATE_OFF) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1453 | continue; |
Stephane Eranian | 5632ab1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1454 | if (!event_filter_match(event)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1455 | continue; |
| 1456 | |
Xiao Guangrong | 8c9ed8e | 2009-09-25 13:51:17 +0800 | [diff] [blame] | 1457 | if (group_can_go_on(event, cpuctx, 1)) |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 1458 | group_sched_in(event, cpuctx, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1459 | |
| 1460 | /* |
| 1461 | * If this pinned group hasn't been scheduled, |
| 1462 | * put it in error state. |
| 1463 | */ |
| 1464 | if (event->state == PERF_EVENT_STATE_INACTIVE) { |
| 1465 | update_group_times(event); |
| 1466 | event->state = PERF_EVENT_STATE_ERROR; |
| 1467 | } |
| 1468 | } |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1469 | } |
| 1470 | |
| 1471 | static void |
| 1472 | ctx_flexible_sched_in(struct perf_event_context *ctx, |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 1473 | struct perf_cpu_context *cpuctx) |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1474 | { |
| 1475 | struct perf_event *event; |
| 1476 | int can_add_hw = 1; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1477 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 1478 | list_for_each_entry(event, &ctx->flexible_groups, group_entry) { |
| 1479 | /* Ignore events in OFF or ERROR state */ |
| 1480 | if (event->state <= PERF_EVENT_STATE_OFF) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1481 | continue; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1482 | /* |
| 1483 | * Listen to the 'cpu' scheduling filter constraint |
| 1484 | * of events: |
| 1485 | */ |
Stephane Eranian | 5632ab1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1486 | if (!event_filter_match(event)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1487 | continue; |
| 1488 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1489 | if (group_can_go_on(event, cpuctx, can_add_hw)) { |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 1490 | if (group_sched_in(event, cpuctx, ctx)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1491 | can_add_hw = 0; |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1492 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1493 | } |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1494 | } |
| 1495 | |
| 1496 | static void |
| 1497 | ctx_sched_in(struct perf_event_context *ctx, |
| 1498 | struct perf_cpu_context *cpuctx, |
| 1499 | enum event_type_t event_type) |
| 1500 | { |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1501 | raw_spin_lock(&ctx->lock); |
| 1502 | ctx->is_active = 1; |
| 1503 | if (likely(!ctx->nr_events)) |
| 1504 | goto out; |
| 1505 | |
| 1506 | ctx->timestamp = perf_clock(); |
| 1507 | |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1508 | /* |
| 1509 | * First go through the list and put on any pinned groups |
| 1510 | * in order to give them the best chance of going on. |
| 1511 | */ |
| 1512 | if (event_type & EVENT_PINNED) |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 1513 | ctx_pinned_sched_in(ctx, cpuctx); |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1514 | |
| 1515 | /* Then walk through the lower prio flexible groups */ |
| 1516 | if (event_type & EVENT_FLEXIBLE) |
Peter Zijlstra | 6e37738 | 2010-02-11 13:21:58 +0100 | [diff] [blame] | 1517 | ctx_flexible_sched_in(ctx, cpuctx); |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1518 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1519 | out: |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1520 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1521 | } |
| 1522 | |
Frederic Weisbecker | 329c0e0 | 2010-01-17 12:56:05 +0100 | [diff] [blame] | 1523 | static void cpu_ctx_sched_in(struct perf_cpu_context *cpuctx, |
| 1524 | enum event_type_t event_type) |
| 1525 | { |
| 1526 | struct perf_event_context *ctx = &cpuctx->ctx; |
| 1527 | |
| 1528 | ctx_sched_in(ctx, cpuctx, event_type); |
| 1529 | } |
| 1530 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1531 | static void task_ctx_sched_in(struct perf_event_context *ctx, |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1532 | enum event_type_t event_type) |
| 1533 | { |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1534 | struct perf_cpu_context *cpuctx; |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1535 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1536 | cpuctx = __get_cpu_context(ctx); |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1537 | if (cpuctx->task_ctx == ctx) |
| 1538 | return; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1539 | |
Frederic Weisbecker | 5b0311e | 2010-01-17 11:59:13 +0100 | [diff] [blame] | 1540 | ctx_sched_in(ctx, cpuctx, event_type); |
| 1541 | cpuctx->task_ctx = ctx; |
| 1542 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1543 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1544 | void perf_event_context_sched_in(struct perf_event_context *ctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1545 | { |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1546 | struct perf_cpu_context *cpuctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1547 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 1548 | cpuctx = __get_cpu_context(ctx); |
Frederic Weisbecker | 329c0e0 | 2010-01-17 12:56:05 +0100 | [diff] [blame] | 1549 | if (cpuctx->task_ctx == ctx) |
| 1550 | return; |
| 1551 | |
Peter Zijlstra | 1b9a644 | 2010-09-07 18:32:22 +0200 | [diff] [blame] | 1552 | perf_pmu_disable(ctx->pmu); |
Frederic Weisbecker | 329c0e0 | 2010-01-17 12:56:05 +0100 | [diff] [blame] | 1553 | /* |
| 1554 | * We want to keep the following priority order: |
| 1555 | * cpu pinned (that don't need to move), task pinned, |
| 1556 | * cpu flexible, task flexible. |
| 1557 | */ |
| 1558 | cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE); |
| 1559 | |
| 1560 | ctx_sched_in(ctx, cpuctx, EVENT_PINNED); |
| 1561 | cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE); |
| 1562 | ctx_sched_in(ctx, cpuctx, EVENT_FLEXIBLE); |
| 1563 | |
| 1564 | cpuctx->task_ctx = ctx; |
eranian@google.com | 9b33fa6 | 2010-03-10 22:26:05 -0800 | [diff] [blame] | 1565 | |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 1566 | /* |
| 1567 | * Since these rotations are per-cpu, we need to ensure the |
| 1568 | * cpu-context we got scheduled on is actually rotating. |
| 1569 | */ |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 1570 | perf_pmu_rotate_start(ctx->pmu); |
Peter Zijlstra | 1b9a644 | 2010-09-07 18:32:22 +0200 | [diff] [blame] | 1571 | perf_pmu_enable(ctx->pmu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1572 | } |
| 1573 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1574 | /* |
| 1575 | * Called from scheduler to add the events of the current task |
| 1576 | * with interrupts disabled. |
| 1577 | * |
| 1578 | * We restore the event value and then enable it. |
| 1579 | * |
| 1580 | * This does not protect us against NMI, but enable() |
| 1581 | * sets the enabled bit in the control field of event _before_ |
| 1582 | * accessing the event control register. If a NMI hits, then it will |
| 1583 | * keep the event running. |
| 1584 | */ |
Peter Zijlstra | 82cd6de | 2010-10-14 17:57:23 +0200 | [diff] [blame] | 1585 | void __perf_event_task_sched_in(struct task_struct *task) |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1586 | { |
| 1587 | struct perf_event_context *ctx; |
| 1588 | int ctxn; |
| 1589 | |
| 1590 | for_each_task_context_nr(ctxn) { |
| 1591 | ctx = task->perf_event_ctxp[ctxn]; |
| 1592 | if (likely(!ctx)) |
| 1593 | continue; |
| 1594 | |
| 1595 | perf_event_context_sched_in(ctx); |
| 1596 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1597 | } |
| 1598 | |
| 1599 | #define MAX_INTERRUPTS (~0ULL) |
| 1600 | |
| 1601 | static void perf_log_throttle(struct perf_event *event, int enable); |
| 1602 | |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 1603 | static u64 perf_calculate_period(struct perf_event *event, u64 nsec, u64 count) |
| 1604 | { |
| 1605 | u64 frequency = event->attr.sample_freq; |
| 1606 | u64 sec = NSEC_PER_SEC; |
| 1607 | u64 divisor, dividend; |
| 1608 | |
| 1609 | int count_fls, nsec_fls, frequency_fls, sec_fls; |
| 1610 | |
| 1611 | count_fls = fls64(count); |
| 1612 | nsec_fls = fls64(nsec); |
| 1613 | frequency_fls = fls64(frequency); |
| 1614 | sec_fls = 30; |
| 1615 | |
| 1616 | /* |
| 1617 | * We got @count in @nsec, with a target of sample_freq HZ |
| 1618 | * the target period becomes: |
| 1619 | * |
| 1620 | * @count * 10^9 |
| 1621 | * period = ------------------- |
| 1622 | * @nsec * sample_freq |
| 1623 | * |
| 1624 | */ |
| 1625 | |
| 1626 | /* |
| 1627 | * Reduce accuracy by one bit such that @a and @b converge |
| 1628 | * to a similar magnitude. |
| 1629 | */ |
| 1630 | #define REDUCE_FLS(a, b) \ |
| 1631 | do { \ |
| 1632 | if (a##_fls > b##_fls) { \ |
| 1633 | a >>= 1; \ |
| 1634 | a##_fls--; \ |
| 1635 | } else { \ |
| 1636 | b >>= 1; \ |
| 1637 | b##_fls--; \ |
| 1638 | } \ |
| 1639 | } while (0) |
| 1640 | |
| 1641 | /* |
| 1642 | * Reduce accuracy until either term fits in a u64, then proceed with |
| 1643 | * the other, so that finally we can do a u64/u64 division. |
| 1644 | */ |
| 1645 | while (count_fls + sec_fls > 64 && nsec_fls + frequency_fls > 64) { |
| 1646 | REDUCE_FLS(nsec, frequency); |
| 1647 | REDUCE_FLS(sec, count); |
| 1648 | } |
| 1649 | |
| 1650 | if (count_fls + sec_fls > 64) { |
| 1651 | divisor = nsec * frequency; |
| 1652 | |
| 1653 | while (count_fls + sec_fls > 64) { |
| 1654 | REDUCE_FLS(count, sec); |
| 1655 | divisor >>= 1; |
| 1656 | } |
| 1657 | |
| 1658 | dividend = count * sec; |
| 1659 | } else { |
| 1660 | dividend = count * sec; |
| 1661 | |
| 1662 | while (nsec_fls + frequency_fls > 64) { |
| 1663 | REDUCE_FLS(nsec, frequency); |
| 1664 | dividend >>= 1; |
| 1665 | } |
| 1666 | |
| 1667 | divisor = nsec * frequency; |
| 1668 | } |
| 1669 | |
Peter Zijlstra | f6ab91a | 2010-06-04 15:18:01 +0200 | [diff] [blame] | 1670 | if (!divisor) |
| 1671 | return dividend; |
| 1672 | |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 1673 | return div64_u64(dividend, divisor); |
| 1674 | } |
| 1675 | |
| 1676 | static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1677 | { |
| 1678 | struct hw_perf_event *hwc = &event->hw; |
Peter Zijlstra | f6ab91a | 2010-06-04 15:18:01 +0200 | [diff] [blame] | 1679 | s64 period, sample_period; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1680 | s64 delta; |
| 1681 | |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 1682 | period = perf_calculate_period(event, nsec, count); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1683 | |
| 1684 | delta = (s64)(period - hwc->sample_period); |
| 1685 | delta = (delta + 7) / 8; /* low pass filter */ |
| 1686 | |
| 1687 | sample_period = hwc->sample_period + delta; |
| 1688 | |
| 1689 | if (!sample_period) |
| 1690 | sample_period = 1; |
| 1691 | |
| 1692 | hwc->sample_period = sample_period; |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 1693 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 1694 | if (local64_read(&hwc->period_left) > 8*sample_period) { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 1695 | event->pmu->stop(event, PERF_EF_UPDATE); |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 1696 | local64_set(&hwc->period_left, 0); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 1697 | event->pmu->start(event, PERF_EF_RELOAD); |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 1698 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1699 | } |
| 1700 | |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 1701 | static void perf_ctx_adjust_freq(struct perf_event_context *ctx, u64 period) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1702 | { |
| 1703 | struct perf_event *event; |
| 1704 | struct hw_perf_event *hwc; |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 1705 | u64 interrupts, now; |
| 1706 | s64 delta; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1707 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1708 | raw_spin_lock(&ctx->lock); |
Paul Mackerras | 03541f8 | 2009-10-14 16:58:03 +1100 | [diff] [blame] | 1709 | list_for_each_entry_rcu(event, &ctx->event_list, event_entry) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1710 | if (event->state != PERF_EVENT_STATE_ACTIVE) |
| 1711 | continue; |
| 1712 | |
Stephane Eranian | 5632ab1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 1713 | if (!event_filter_match(event)) |
Peter Zijlstra | 5d27c23 | 2009-12-17 13:16:32 +0100 | [diff] [blame] | 1714 | continue; |
| 1715 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1716 | hwc = &event->hw; |
| 1717 | |
| 1718 | interrupts = hwc->interrupts; |
| 1719 | hwc->interrupts = 0; |
| 1720 | |
| 1721 | /* |
| 1722 | * unthrottle events on the tick |
| 1723 | */ |
| 1724 | if (interrupts == MAX_INTERRUPTS) { |
| 1725 | perf_log_throttle(event, 1); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 1726 | event->pmu->start(event, 0); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1727 | } |
| 1728 | |
| 1729 | if (!event->attr.freq || !event->attr.sample_freq) |
| 1730 | continue; |
| 1731 | |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 1732 | event->pmu->read(event); |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 1733 | now = local64_read(&event->count); |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 1734 | delta = now - hwc->freq_count_stamp; |
| 1735 | hwc->freq_count_stamp = now; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1736 | |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 1737 | if (delta > 0) |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 1738 | perf_adjust_period(event, period, delta); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1739 | } |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1740 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1741 | } |
| 1742 | |
| 1743 | /* |
| 1744 | * Round-robin a context's events: |
| 1745 | */ |
| 1746 | static void rotate_ctx(struct perf_event_context *ctx) |
| 1747 | { |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1748 | raw_spin_lock(&ctx->lock); |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 1749 | |
Thomas Gleixner | dddd337 | 2010-11-24 10:05:55 +0100 | [diff] [blame] | 1750 | /* |
| 1751 | * Rotate the first entry last of non-pinned groups. Rotation might be |
| 1752 | * disabled by the inheritance code. |
| 1753 | */ |
| 1754 | if (!ctx->rotate_disable) |
| 1755 | list_rotate_left(&ctx->flexible_groups); |
Frederic Weisbecker | e286417 | 2010-01-09 21:05:28 +0100 | [diff] [blame] | 1756 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1757 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1758 | } |
| 1759 | |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 1760 | /* |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 1761 | * perf_pmu_rotate_start() and perf_rotate_context() are fully serialized |
| 1762 | * because they're strictly cpu affine and rotate_start is called with IRQs |
| 1763 | * disabled, while rotate_context is called from IRQ context. |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 1764 | */ |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 1765 | static void perf_rotate_context(struct perf_cpu_context *cpuctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1766 | { |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 1767 | u64 interval = (u64)cpuctx->jiffies_interval * TICK_NSEC; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1768 | struct perf_event_context *ctx = NULL; |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 1769 | int rotate = 0, remove = 1; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1770 | |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 1771 | if (cpuctx->ctx.nr_events) { |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 1772 | remove = 0; |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 1773 | if (cpuctx->ctx.nr_events != cpuctx->ctx.nr_active) |
| 1774 | rotate = 1; |
| 1775 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1776 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1777 | ctx = cpuctx->task_ctx; |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 1778 | if (ctx && ctx->nr_events) { |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 1779 | remove = 0; |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 1780 | if (ctx->nr_events != ctx->nr_active) |
| 1781 | rotate = 1; |
| 1782 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1783 | |
Peter Zijlstra | 1b9a644 | 2010-09-07 18:32:22 +0200 | [diff] [blame] | 1784 | perf_pmu_disable(cpuctx->ctx.pmu); |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 1785 | perf_ctx_adjust_freq(&cpuctx->ctx, interval); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1786 | if (ctx) |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 1787 | perf_ctx_adjust_freq(ctx, interval); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1788 | |
Peter Zijlstra | d4944a0 | 2010-03-08 13:51:20 +0100 | [diff] [blame] | 1789 | if (!rotate) |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 1790 | goto done; |
Peter Zijlstra | d4944a0 | 2010-03-08 13:51:20 +0100 | [diff] [blame] | 1791 | |
Frederic Weisbecker | 7defb0f | 2010-01-17 12:15:31 +0100 | [diff] [blame] | 1792 | cpu_ctx_sched_out(cpuctx, EVENT_FLEXIBLE); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1793 | if (ctx) |
Frederic Weisbecker | 7defb0f | 2010-01-17 12:15:31 +0100 | [diff] [blame] | 1794 | task_ctx_sched_out(ctx, EVENT_FLEXIBLE); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1795 | |
| 1796 | rotate_ctx(&cpuctx->ctx); |
| 1797 | if (ctx) |
| 1798 | rotate_ctx(ctx); |
| 1799 | |
Frederic Weisbecker | 7defb0f | 2010-01-17 12:15:31 +0100 | [diff] [blame] | 1800 | cpu_ctx_sched_in(cpuctx, EVENT_FLEXIBLE); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1801 | if (ctx) |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1802 | task_ctx_sched_in(ctx, EVENT_FLEXIBLE); |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 1803 | |
| 1804 | done: |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 1805 | if (remove) |
| 1806 | list_del_init(&cpuctx->rotation_list); |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 1807 | |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 1808 | perf_pmu_enable(cpuctx->ctx.pmu); |
| 1809 | } |
| 1810 | |
| 1811 | void perf_event_task_tick(void) |
| 1812 | { |
| 1813 | struct list_head *head = &__get_cpu_var(rotation_list); |
| 1814 | struct perf_cpu_context *cpuctx, *tmp; |
| 1815 | |
| 1816 | WARN_ON(!irqs_disabled()); |
| 1817 | |
| 1818 | list_for_each_entry_safe(cpuctx, tmp, head, rotation_list) { |
| 1819 | if (cpuctx->jiffies_interval == 1 || |
| 1820 | !(jiffies % cpuctx->jiffies_interval)) |
| 1821 | perf_rotate_context(cpuctx); |
| 1822 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1823 | } |
| 1824 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 1825 | static int event_enable_on_exec(struct perf_event *event, |
| 1826 | struct perf_event_context *ctx) |
| 1827 | { |
| 1828 | if (!event->attr.enable_on_exec) |
| 1829 | return 0; |
| 1830 | |
| 1831 | event->attr.enable_on_exec = 0; |
| 1832 | if (event->state >= PERF_EVENT_STATE_INACTIVE) |
| 1833 | return 0; |
| 1834 | |
| 1835 | __perf_event_mark_enabled(event, ctx); |
| 1836 | |
| 1837 | return 1; |
| 1838 | } |
| 1839 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1840 | /* |
| 1841 | * Enable all of a task's events that have been marked enable-on-exec. |
| 1842 | * This expects task == current. |
| 1843 | */ |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1844 | static void perf_event_enable_on_exec(struct perf_event_context *ctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1845 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1846 | struct perf_event *event; |
| 1847 | unsigned long flags; |
| 1848 | int enabled = 0; |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 1849 | int ret; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1850 | |
| 1851 | local_irq_save(flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1852 | if (!ctx || !ctx->nr_events) |
| 1853 | goto out; |
| 1854 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1855 | task_ctx_sched_out(ctx, EVENT_ALL); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1856 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1857 | raw_spin_lock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1858 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 1859 | list_for_each_entry(event, &ctx->pinned_groups, group_entry) { |
| 1860 | ret = event_enable_on_exec(event, ctx); |
| 1861 | if (ret) |
| 1862 | enabled = 1; |
| 1863 | } |
| 1864 | |
| 1865 | list_for_each_entry(event, &ctx->flexible_groups, group_entry) { |
| 1866 | ret = event_enable_on_exec(event, ctx); |
| 1867 | if (ret) |
| 1868 | enabled = 1; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1869 | } |
| 1870 | |
| 1871 | /* |
| 1872 | * Unclone this context if we enabled any event. |
| 1873 | */ |
| 1874 | if (enabled) |
| 1875 | unclone_ctx(ctx); |
| 1876 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1877 | raw_spin_unlock(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1878 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 1879 | perf_event_context_sched_in(ctx); |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 1880 | out: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1881 | local_irq_restore(flags); |
| 1882 | } |
| 1883 | |
| 1884 | /* |
| 1885 | * Cross CPU call to read the hardware event |
| 1886 | */ |
| 1887 | static void __perf_event_read(void *info) |
| 1888 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1889 | struct perf_event *event = info; |
| 1890 | struct perf_event_context *ctx = event->ctx; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 1891 | struct perf_cpu_context *cpuctx = __get_cpu_context(ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1892 | |
| 1893 | /* |
| 1894 | * If this is a task context, we need to check whether it is |
| 1895 | * the current task context of this cpu. If not it has been |
| 1896 | * scheduled out before the smp call arrived. In that case |
| 1897 | * event->count would have been updated to a recent sample |
| 1898 | * when the event was scheduled out. |
| 1899 | */ |
| 1900 | if (ctx->task && cpuctx->task_ctx != ctx) |
| 1901 | return; |
| 1902 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1903 | raw_spin_lock(&ctx->lock); |
Peter Zijlstra | 58e5ad1 | 2009-11-20 22:19:53 +0100 | [diff] [blame] | 1904 | update_context_time(ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1905 | update_event_times(event); |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1906 | raw_spin_unlock(&ctx->lock); |
Peter Zijlstra | 2b8988c | 2009-11-20 22:19:54 +0100 | [diff] [blame] | 1907 | |
Peter Zijlstra | 58e5ad1 | 2009-11-20 22:19:53 +0100 | [diff] [blame] | 1908 | event->pmu->read(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1909 | } |
| 1910 | |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 1911 | static inline u64 perf_event_count(struct perf_event *event) |
| 1912 | { |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 1913 | return local64_read(&event->count) + atomic64_read(&event->child_count); |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 1914 | } |
| 1915 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1916 | static u64 perf_event_read(struct perf_event *event) |
| 1917 | { |
| 1918 | /* |
| 1919 | * If event is enabled and currently active on a CPU, update the |
| 1920 | * value in the event structure: |
| 1921 | */ |
| 1922 | if (event->state == PERF_EVENT_STATE_ACTIVE) { |
| 1923 | smp_call_function_single(event->oncpu, |
| 1924 | __perf_event_read, event, 1); |
| 1925 | } else if (event->state == PERF_EVENT_STATE_INACTIVE) { |
Peter Zijlstra | 2b8988c | 2009-11-20 22:19:54 +0100 | [diff] [blame] | 1926 | struct perf_event_context *ctx = event->ctx; |
| 1927 | unsigned long flags; |
| 1928 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1929 | raw_spin_lock_irqsave(&ctx->lock, flags); |
Stephane Eranian | c530ccd | 2010-10-15 15:26:01 +0200 | [diff] [blame] | 1930 | /* |
| 1931 | * may read while context is not active |
| 1932 | * (e.g., thread is blocked), in that case |
| 1933 | * we cannot update context time |
| 1934 | */ |
| 1935 | if (ctx->is_active) |
| 1936 | update_context_time(ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1937 | update_event_times(event); |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 1938 | raw_spin_unlock_irqrestore(&ctx->lock, flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1939 | } |
| 1940 | |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 1941 | return perf_event_count(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 1942 | } |
| 1943 | |
| 1944 | /* |
Frederic Weisbecker | 927c7a9 | 2010-07-01 16:20:36 +0200 | [diff] [blame] | 1945 | * Callchain support |
| 1946 | */ |
| 1947 | |
| 1948 | struct callchain_cpus_entries { |
| 1949 | struct rcu_head rcu_head; |
| 1950 | struct perf_callchain_entry *cpu_entries[0]; |
| 1951 | }; |
| 1952 | |
Frederic Weisbecker | 7ae07ea | 2010-08-14 20:45:13 +0200 | [diff] [blame] | 1953 | static DEFINE_PER_CPU(int, callchain_recursion[PERF_NR_CONTEXTS]); |
Frederic Weisbecker | 927c7a9 | 2010-07-01 16:20:36 +0200 | [diff] [blame] | 1954 | static atomic_t nr_callchain_events; |
| 1955 | static DEFINE_MUTEX(callchain_mutex); |
| 1956 | struct callchain_cpus_entries *callchain_cpus_entries; |
| 1957 | |
| 1958 | |
| 1959 | __weak void perf_callchain_kernel(struct perf_callchain_entry *entry, |
| 1960 | struct pt_regs *regs) |
| 1961 | { |
| 1962 | } |
| 1963 | |
| 1964 | __weak void perf_callchain_user(struct perf_callchain_entry *entry, |
| 1965 | struct pt_regs *regs) |
| 1966 | { |
| 1967 | } |
| 1968 | |
| 1969 | static void release_callchain_buffers_rcu(struct rcu_head *head) |
| 1970 | { |
| 1971 | struct callchain_cpus_entries *entries; |
| 1972 | int cpu; |
| 1973 | |
| 1974 | entries = container_of(head, struct callchain_cpus_entries, rcu_head); |
| 1975 | |
| 1976 | for_each_possible_cpu(cpu) |
| 1977 | kfree(entries->cpu_entries[cpu]); |
| 1978 | |
| 1979 | kfree(entries); |
| 1980 | } |
| 1981 | |
| 1982 | static void release_callchain_buffers(void) |
| 1983 | { |
| 1984 | struct callchain_cpus_entries *entries; |
| 1985 | |
| 1986 | entries = callchain_cpus_entries; |
| 1987 | rcu_assign_pointer(callchain_cpus_entries, NULL); |
| 1988 | call_rcu(&entries->rcu_head, release_callchain_buffers_rcu); |
| 1989 | } |
| 1990 | |
| 1991 | static int alloc_callchain_buffers(void) |
| 1992 | { |
| 1993 | int cpu; |
| 1994 | int size; |
| 1995 | struct callchain_cpus_entries *entries; |
| 1996 | |
| 1997 | /* |
| 1998 | * We can't use the percpu allocation API for data that can be |
| 1999 | * accessed from NMI. Use a temporary manual per cpu allocation |
| 2000 | * until that gets sorted out. |
| 2001 | */ |
| 2002 | size = sizeof(*entries) + sizeof(struct perf_callchain_entry *) * |
| 2003 | num_possible_cpus(); |
| 2004 | |
| 2005 | entries = kzalloc(size, GFP_KERNEL); |
| 2006 | if (!entries) |
| 2007 | return -ENOMEM; |
| 2008 | |
Frederic Weisbecker | 7ae07ea | 2010-08-14 20:45:13 +0200 | [diff] [blame] | 2009 | size = sizeof(struct perf_callchain_entry) * PERF_NR_CONTEXTS; |
Frederic Weisbecker | 927c7a9 | 2010-07-01 16:20:36 +0200 | [diff] [blame] | 2010 | |
| 2011 | for_each_possible_cpu(cpu) { |
| 2012 | entries->cpu_entries[cpu] = kmalloc_node(size, GFP_KERNEL, |
| 2013 | cpu_to_node(cpu)); |
| 2014 | if (!entries->cpu_entries[cpu]) |
| 2015 | goto fail; |
| 2016 | } |
| 2017 | |
| 2018 | rcu_assign_pointer(callchain_cpus_entries, entries); |
| 2019 | |
| 2020 | return 0; |
| 2021 | |
| 2022 | fail: |
| 2023 | for_each_possible_cpu(cpu) |
| 2024 | kfree(entries->cpu_entries[cpu]); |
| 2025 | kfree(entries); |
| 2026 | |
| 2027 | return -ENOMEM; |
| 2028 | } |
| 2029 | |
| 2030 | static int get_callchain_buffers(void) |
| 2031 | { |
| 2032 | int err = 0; |
| 2033 | int count; |
| 2034 | |
| 2035 | mutex_lock(&callchain_mutex); |
| 2036 | |
| 2037 | count = atomic_inc_return(&nr_callchain_events); |
| 2038 | if (WARN_ON_ONCE(count < 1)) { |
| 2039 | err = -EINVAL; |
| 2040 | goto exit; |
| 2041 | } |
| 2042 | |
| 2043 | if (count > 1) { |
| 2044 | /* If the allocation failed, give up */ |
| 2045 | if (!callchain_cpus_entries) |
| 2046 | err = -ENOMEM; |
| 2047 | goto exit; |
| 2048 | } |
| 2049 | |
| 2050 | err = alloc_callchain_buffers(); |
| 2051 | if (err) |
| 2052 | release_callchain_buffers(); |
| 2053 | exit: |
| 2054 | mutex_unlock(&callchain_mutex); |
| 2055 | |
| 2056 | return err; |
| 2057 | } |
| 2058 | |
| 2059 | static void put_callchain_buffers(void) |
| 2060 | { |
| 2061 | if (atomic_dec_and_mutex_lock(&nr_callchain_events, &callchain_mutex)) { |
| 2062 | release_callchain_buffers(); |
| 2063 | mutex_unlock(&callchain_mutex); |
| 2064 | } |
| 2065 | } |
| 2066 | |
| 2067 | static int get_recursion_context(int *recursion) |
| 2068 | { |
| 2069 | int rctx; |
| 2070 | |
| 2071 | if (in_nmi()) |
| 2072 | rctx = 3; |
| 2073 | else if (in_irq()) |
| 2074 | rctx = 2; |
| 2075 | else if (in_softirq()) |
| 2076 | rctx = 1; |
| 2077 | else |
| 2078 | rctx = 0; |
| 2079 | |
| 2080 | if (recursion[rctx]) |
| 2081 | return -1; |
| 2082 | |
| 2083 | recursion[rctx]++; |
| 2084 | barrier(); |
| 2085 | |
| 2086 | return rctx; |
| 2087 | } |
| 2088 | |
| 2089 | static inline void put_recursion_context(int *recursion, int rctx) |
| 2090 | { |
| 2091 | barrier(); |
| 2092 | recursion[rctx]--; |
| 2093 | } |
| 2094 | |
| 2095 | static struct perf_callchain_entry *get_callchain_entry(int *rctx) |
| 2096 | { |
| 2097 | int cpu; |
| 2098 | struct callchain_cpus_entries *entries; |
| 2099 | |
| 2100 | *rctx = get_recursion_context(__get_cpu_var(callchain_recursion)); |
| 2101 | if (*rctx == -1) |
| 2102 | return NULL; |
| 2103 | |
| 2104 | entries = rcu_dereference(callchain_cpus_entries); |
| 2105 | if (!entries) |
| 2106 | return NULL; |
| 2107 | |
| 2108 | cpu = smp_processor_id(); |
| 2109 | |
| 2110 | return &entries->cpu_entries[cpu][*rctx]; |
| 2111 | } |
| 2112 | |
| 2113 | static void |
| 2114 | put_callchain_entry(int rctx) |
| 2115 | { |
| 2116 | put_recursion_context(__get_cpu_var(callchain_recursion), rctx); |
| 2117 | } |
| 2118 | |
| 2119 | static struct perf_callchain_entry *perf_callchain(struct pt_regs *regs) |
| 2120 | { |
| 2121 | int rctx; |
| 2122 | struct perf_callchain_entry *entry; |
| 2123 | |
| 2124 | |
| 2125 | entry = get_callchain_entry(&rctx); |
| 2126 | if (rctx == -1) |
| 2127 | return NULL; |
| 2128 | |
| 2129 | if (!entry) |
| 2130 | goto exit_put; |
| 2131 | |
| 2132 | entry->nr = 0; |
| 2133 | |
| 2134 | if (!user_mode(regs)) { |
| 2135 | perf_callchain_store(entry, PERF_CONTEXT_KERNEL); |
| 2136 | perf_callchain_kernel(entry, regs); |
| 2137 | if (current->mm) |
| 2138 | regs = task_pt_regs(current); |
| 2139 | else |
| 2140 | regs = NULL; |
| 2141 | } |
| 2142 | |
| 2143 | if (regs) { |
| 2144 | perf_callchain_store(entry, PERF_CONTEXT_USER); |
| 2145 | perf_callchain_user(entry, regs); |
| 2146 | } |
| 2147 | |
| 2148 | exit_put: |
| 2149 | put_callchain_entry(rctx); |
| 2150 | |
| 2151 | return entry; |
| 2152 | } |
| 2153 | |
| 2154 | /* |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2155 | * Initialize the perf_event context in a task_struct: |
| 2156 | */ |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 2157 | static void __perf_event_init_context(struct perf_event_context *ctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2158 | { |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 2159 | raw_spin_lock_init(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2160 | mutex_init(&ctx->mutex); |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 2161 | INIT_LIST_HEAD(&ctx->pinned_groups); |
| 2162 | INIT_LIST_HEAD(&ctx->flexible_groups); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2163 | INIT_LIST_HEAD(&ctx->event_list); |
| 2164 | atomic_set(&ctx->refcount, 1); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2165 | } |
| 2166 | |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 2167 | static struct perf_event_context * |
| 2168 | alloc_perf_context(struct pmu *pmu, struct task_struct *task) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2169 | { |
| 2170 | struct perf_event_context *ctx; |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 2171 | |
| 2172 | ctx = kzalloc(sizeof(struct perf_event_context), GFP_KERNEL); |
| 2173 | if (!ctx) |
| 2174 | return NULL; |
| 2175 | |
| 2176 | __perf_event_init_context(ctx); |
| 2177 | if (task) { |
| 2178 | ctx->task = task; |
| 2179 | get_task_struct(task); |
| 2180 | } |
| 2181 | ctx->pmu = pmu; |
| 2182 | |
| 2183 | return ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2184 | } |
| 2185 | |
Matt Helsley | 2ebd4ff | 2010-09-13 13:01:19 -0700 | [diff] [blame] | 2186 | static struct task_struct * |
| 2187 | find_lively_task_by_vpid(pid_t vpid) |
| 2188 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2189 | struct task_struct *task; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2190 | int err; |
| 2191 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2192 | rcu_read_lock(); |
Matt Helsley | 2ebd4ff | 2010-09-13 13:01:19 -0700 | [diff] [blame] | 2193 | if (!vpid) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2194 | task = current; |
| 2195 | else |
Matt Helsley | 2ebd4ff | 2010-09-13 13:01:19 -0700 | [diff] [blame] | 2196 | task = find_task_by_vpid(vpid); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2197 | if (task) |
| 2198 | get_task_struct(task); |
| 2199 | rcu_read_unlock(); |
| 2200 | |
| 2201 | if (!task) |
| 2202 | return ERR_PTR(-ESRCH); |
| 2203 | |
| 2204 | /* |
| 2205 | * Can't attach events to a dying task. |
| 2206 | */ |
| 2207 | err = -ESRCH; |
| 2208 | if (task->flags & PF_EXITING) |
| 2209 | goto errout; |
| 2210 | |
| 2211 | /* Reuse ptrace permission checks for now. */ |
| 2212 | err = -EACCES; |
| 2213 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
| 2214 | goto errout; |
| 2215 | |
Matt Helsley | 2ebd4ff | 2010-09-13 13:01:19 -0700 | [diff] [blame] | 2216 | return task; |
| 2217 | errout: |
| 2218 | put_task_struct(task); |
| 2219 | return ERR_PTR(err); |
| 2220 | |
| 2221 | } |
| 2222 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 2223 | static struct perf_event_context * |
Matt Helsley | 38a81da | 2010-09-13 13:01:20 -0700 | [diff] [blame] | 2224 | find_get_context(struct pmu *pmu, struct task_struct *task, int cpu) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2225 | { |
| 2226 | struct perf_event_context *ctx; |
| 2227 | struct perf_cpu_context *cpuctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2228 | unsigned long flags; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2229 | int ctxn, err; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2230 | |
Oleg Nesterov | 22a4ec7 | 2011-01-18 17:10:08 +0100 | [diff] [blame] | 2231 | if (!task) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2232 | /* Must be root to operate on a CPU event: */ |
| 2233 | if (perf_paranoid_cpu() && !capable(CAP_SYS_ADMIN)) |
| 2234 | return ERR_PTR(-EACCES); |
| 2235 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2236 | /* |
| 2237 | * We could be clever and allow to attach a event to an |
| 2238 | * offline CPU and activate it when the CPU comes up, but |
| 2239 | * that's for later. |
| 2240 | */ |
| 2241 | if (!cpu_online(cpu)) |
| 2242 | return ERR_PTR(-ENODEV); |
| 2243 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 2244 | cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2245 | ctx = &cpuctx->ctx; |
| 2246 | get_ctx(ctx); |
| 2247 | |
| 2248 | return ctx; |
| 2249 | } |
| 2250 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2251 | err = -EINVAL; |
| 2252 | ctxn = pmu->task_ctx_nr; |
| 2253 | if (ctxn < 0) |
| 2254 | goto errout; |
| 2255 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 2256 | retry: |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2257 | ctx = perf_lock_task_context(task, ctxn, &flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2258 | if (ctx) { |
| 2259 | unclone_ctx(ctx); |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 2260 | raw_spin_unlock_irqrestore(&ctx->lock, flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2261 | } |
| 2262 | |
| 2263 | if (!ctx) { |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 2264 | ctx = alloc_perf_context(pmu, task); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2265 | err = -ENOMEM; |
| 2266 | if (!ctx) |
| 2267 | goto errout; |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 2268 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2269 | get_ctx(ctx); |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 2270 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 2271 | if (cmpxchg(&task->perf_event_ctxp[ctxn], NULL, ctx)) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2272 | /* |
| 2273 | * We raced with some other task; use |
| 2274 | * the context they set. |
| 2275 | */ |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 2276 | put_task_struct(task); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2277 | kfree(ctx); |
| 2278 | goto retry; |
| 2279 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2280 | } |
| 2281 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2282 | return ctx; |
| 2283 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 2284 | errout: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2285 | return ERR_PTR(err); |
| 2286 | } |
| 2287 | |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 2288 | static void perf_event_free_filter(struct perf_event *event); |
| 2289 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2290 | static void free_event_rcu(struct rcu_head *head) |
| 2291 | { |
| 2292 | struct perf_event *event; |
| 2293 | |
| 2294 | event = container_of(head, struct perf_event, rcu_head); |
| 2295 | if (event->ns) |
| 2296 | put_pid_ns(event->ns); |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 2297 | perf_event_free_filter(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2298 | kfree(event); |
| 2299 | } |
| 2300 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2301 | static void perf_buffer_put(struct perf_buffer *buffer); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2302 | |
| 2303 | static void free_event(struct perf_event *event) |
| 2304 | { |
Peter Zijlstra | e360adb | 2010-10-14 14:01:34 +0800 | [diff] [blame] | 2305 | irq_work_sync(&event->pending); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2306 | |
| 2307 | if (!event->parent) { |
Peter Zijlstra | 82cd6de | 2010-10-14 17:57:23 +0200 | [diff] [blame] | 2308 | if (event->attach_state & PERF_ATTACH_TASK) |
| 2309 | jump_label_dec(&perf_task_events); |
Eric B Munson | 3af9e85 | 2010-05-18 15:30:49 +0100 | [diff] [blame] | 2310 | if (event->attr.mmap || event->attr.mmap_data) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2311 | atomic_dec(&nr_mmap_events); |
| 2312 | if (event->attr.comm) |
| 2313 | atomic_dec(&nr_comm_events); |
| 2314 | if (event->attr.task) |
| 2315 | atomic_dec(&nr_task_events); |
Frederic Weisbecker | 927c7a9 | 2010-07-01 16:20:36 +0200 | [diff] [blame] | 2316 | if (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN) |
| 2317 | put_callchain_buffers(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2318 | } |
| 2319 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2320 | if (event->buffer) { |
| 2321 | perf_buffer_put(event->buffer); |
| 2322 | event->buffer = NULL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2323 | } |
| 2324 | |
| 2325 | if (event->destroy) |
| 2326 | event->destroy(event); |
| 2327 | |
Peter Zijlstra | 0c67b40 | 2010-09-13 11:15:58 +0200 | [diff] [blame] | 2328 | if (event->ctx) |
| 2329 | put_ctx(event->ctx); |
| 2330 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2331 | call_rcu(&event->rcu_head, free_event_rcu); |
| 2332 | } |
| 2333 | |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 2334 | int perf_event_release_kernel(struct perf_event *event) |
| 2335 | { |
| 2336 | struct perf_event_context *ctx = event->ctx; |
| 2337 | |
Peter Zijlstra | 050735b | 2010-05-11 11:51:53 +0200 | [diff] [blame] | 2338 | /* |
| 2339 | * Remove from the PMU, can't get re-enabled since we got |
| 2340 | * here because the last ref went. |
| 2341 | */ |
| 2342 | perf_event_disable(event); |
| 2343 | |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 2344 | WARN_ON_ONCE(ctx->parent_ctx); |
Peter Zijlstra | a0507c8 | 2010-05-06 15:42:53 +0200 | [diff] [blame] | 2345 | /* |
| 2346 | * There are two ways this annotation is useful: |
| 2347 | * |
| 2348 | * 1) there is a lock recursion from perf_event_exit_task |
| 2349 | * see the comment there. |
| 2350 | * |
| 2351 | * 2) there is a lock-inversion with mmap_sem through |
| 2352 | * perf_event_read_group(), which takes faults while |
| 2353 | * holding ctx->mutex, however this is called after |
| 2354 | * the last filedesc died, so there is no possibility |
| 2355 | * to trigger the AB-BA case. |
| 2356 | */ |
| 2357 | mutex_lock_nested(&ctx->mutex, SINGLE_DEPTH_NESTING); |
Peter Zijlstra | 050735b | 2010-05-11 11:51:53 +0200 | [diff] [blame] | 2358 | raw_spin_lock_irq(&ctx->lock); |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 2359 | perf_group_detach(event); |
Peter Zijlstra | 050735b | 2010-05-11 11:51:53 +0200 | [diff] [blame] | 2360 | list_del_event(event, ctx); |
Peter Zijlstra | 050735b | 2010-05-11 11:51:53 +0200 | [diff] [blame] | 2361 | raw_spin_unlock_irq(&ctx->lock); |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 2362 | mutex_unlock(&ctx->mutex); |
| 2363 | |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 2364 | free_event(event); |
| 2365 | |
| 2366 | return 0; |
| 2367 | } |
| 2368 | EXPORT_SYMBOL_GPL(perf_event_release_kernel); |
| 2369 | |
Peter Zijlstra | a66a305 | 2009-11-23 11:37:23 +0100 | [diff] [blame] | 2370 | /* |
| 2371 | * Called when the last reference to the file is gone. |
| 2372 | */ |
| 2373 | static int perf_release(struct inode *inode, struct file *file) |
| 2374 | { |
| 2375 | struct perf_event *event = file->private_data; |
Peter Zijlstra | 8882135 | 2010-11-09 19:01:43 +0100 | [diff] [blame] | 2376 | struct task_struct *owner; |
Peter Zijlstra | a66a305 | 2009-11-23 11:37:23 +0100 | [diff] [blame] | 2377 | |
| 2378 | file->private_data = NULL; |
| 2379 | |
Peter Zijlstra | 8882135 | 2010-11-09 19:01:43 +0100 | [diff] [blame] | 2380 | rcu_read_lock(); |
| 2381 | owner = ACCESS_ONCE(event->owner); |
| 2382 | /* |
| 2383 | * Matches the smp_wmb() in perf_event_exit_task(). If we observe |
| 2384 | * !owner it means the list deletion is complete and we can indeed |
| 2385 | * free this event, otherwise we need to serialize on |
| 2386 | * owner->perf_event_mutex. |
| 2387 | */ |
| 2388 | smp_read_barrier_depends(); |
| 2389 | if (owner) { |
| 2390 | /* |
| 2391 | * Since delayed_put_task_struct() also drops the last |
| 2392 | * task reference we can safely take a new reference |
| 2393 | * while holding the rcu_read_lock(). |
| 2394 | */ |
| 2395 | get_task_struct(owner); |
| 2396 | } |
| 2397 | rcu_read_unlock(); |
| 2398 | |
| 2399 | if (owner) { |
| 2400 | mutex_lock(&owner->perf_event_mutex); |
| 2401 | /* |
| 2402 | * We have to re-check the event->owner field, if it is cleared |
| 2403 | * we raced with perf_event_exit_task(), acquiring the mutex |
| 2404 | * ensured they're done, and we can proceed with freeing the |
| 2405 | * event. |
| 2406 | */ |
| 2407 | if (event->owner) |
| 2408 | list_del_init(&event->owner_entry); |
| 2409 | mutex_unlock(&owner->perf_event_mutex); |
| 2410 | put_task_struct(owner); |
| 2411 | } |
| 2412 | |
Peter Zijlstra | a66a305 | 2009-11-23 11:37:23 +0100 | [diff] [blame] | 2413 | return perf_event_release_kernel(event); |
| 2414 | } |
| 2415 | |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 2416 | 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] | 2417 | { |
| 2418 | struct perf_event *child; |
| 2419 | u64 total = 0; |
| 2420 | |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 2421 | *enabled = 0; |
| 2422 | *running = 0; |
| 2423 | |
Peter Zijlstra | 6f10581 | 2009-11-20 22:19:56 +0100 | [diff] [blame] | 2424 | mutex_lock(&event->child_mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2425 | total += perf_event_read(event); |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 2426 | *enabled += event->total_time_enabled + |
| 2427 | atomic64_read(&event->child_total_time_enabled); |
| 2428 | *running += event->total_time_running + |
| 2429 | atomic64_read(&event->child_total_time_running); |
| 2430 | |
| 2431 | list_for_each_entry(child, &event->child_list, child_list) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2432 | total += perf_event_read(child); |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 2433 | *enabled += child->total_time_enabled; |
| 2434 | *running += child->total_time_running; |
| 2435 | } |
Peter Zijlstra | 6f10581 | 2009-11-20 22:19:56 +0100 | [diff] [blame] | 2436 | mutex_unlock(&event->child_mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2437 | |
| 2438 | return total; |
| 2439 | } |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 2440 | EXPORT_SYMBOL_GPL(perf_event_read_value); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2441 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2442 | static int perf_event_read_group(struct perf_event *event, |
| 2443 | u64 read_format, char __user *buf) |
| 2444 | { |
| 2445 | struct perf_event *leader = event->group_leader, *sub; |
Peter Zijlstra | 6f10581 | 2009-11-20 22:19:56 +0100 | [diff] [blame] | 2446 | int n = 0, size = 0, ret = -EFAULT; |
| 2447 | struct perf_event_context *ctx = leader->ctx; |
Peter Zijlstra | abf4868 | 2009-11-20 22:19:49 +0100 | [diff] [blame] | 2448 | u64 values[5]; |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 2449 | u64 count, enabled, running; |
Peter Zijlstra | abf4868 | 2009-11-20 22:19:49 +0100 | [diff] [blame] | 2450 | |
Peter Zijlstra | 6f10581 | 2009-11-20 22:19:56 +0100 | [diff] [blame] | 2451 | mutex_lock(&ctx->mutex); |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 2452 | count = perf_event_read_value(leader, &enabled, &running); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2453 | |
| 2454 | values[n++] = 1 + leader->nr_siblings; |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 2455 | if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) |
| 2456 | values[n++] = enabled; |
| 2457 | if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) |
| 2458 | values[n++] = running; |
Peter Zijlstra | abf4868 | 2009-11-20 22:19:49 +0100 | [diff] [blame] | 2459 | values[n++] = count; |
| 2460 | if (read_format & PERF_FORMAT_ID) |
| 2461 | values[n++] = primary_event_id(leader); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2462 | |
| 2463 | size = n * sizeof(u64); |
| 2464 | |
| 2465 | if (copy_to_user(buf, values, size)) |
Peter Zijlstra | 6f10581 | 2009-11-20 22:19:56 +0100 | [diff] [blame] | 2466 | goto unlock; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2467 | |
Peter Zijlstra | 6f10581 | 2009-11-20 22:19:56 +0100 | [diff] [blame] | 2468 | ret = size; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2469 | |
| 2470 | list_for_each_entry(sub, &leader->sibling_list, group_entry) { |
Peter Zijlstra | abf4868 | 2009-11-20 22:19:49 +0100 | [diff] [blame] | 2471 | n = 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2472 | |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 2473 | values[n++] = perf_event_read_value(sub, &enabled, &running); |
Peter Zijlstra | abf4868 | 2009-11-20 22:19:49 +0100 | [diff] [blame] | 2474 | if (read_format & PERF_FORMAT_ID) |
| 2475 | values[n++] = primary_event_id(sub); |
| 2476 | |
| 2477 | size = n * sizeof(u64); |
| 2478 | |
Stephane Eranian | 184d3da | 2009-11-23 21:40:49 -0800 | [diff] [blame] | 2479 | if (copy_to_user(buf + ret, values, size)) { |
Peter Zijlstra | 6f10581 | 2009-11-20 22:19:56 +0100 | [diff] [blame] | 2480 | ret = -EFAULT; |
| 2481 | goto unlock; |
| 2482 | } |
Peter Zijlstra | abf4868 | 2009-11-20 22:19:49 +0100 | [diff] [blame] | 2483 | |
| 2484 | ret += size; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2485 | } |
Peter Zijlstra | 6f10581 | 2009-11-20 22:19:56 +0100 | [diff] [blame] | 2486 | unlock: |
| 2487 | mutex_unlock(&ctx->mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2488 | |
Peter Zijlstra | abf4868 | 2009-11-20 22:19:49 +0100 | [diff] [blame] | 2489 | return ret; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2490 | } |
| 2491 | |
| 2492 | static int perf_event_read_one(struct perf_event *event, |
| 2493 | u64 read_format, char __user *buf) |
| 2494 | { |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 2495 | u64 enabled, running; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2496 | u64 values[4]; |
| 2497 | int n = 0; |
| 2498 | |
Peter Zijlstra | 59ed446 | 2009-11-20 22:19:55 +0100 | [diff] [blame] | 2499 | values[n++] = perf_event_read_value(event, &enabled, &running); |
| 2500 | if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) |
| 2501 | values[n++] = enabled; |
| 2502 | if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) |
| 2503 | values[n++] = running; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2504 | if (read_format & PERF_FORMAT_ID) |
| 2505 | values[n++] = primary_event_id(event); |
| 2506 | |
| 2507 | if (copy_to_user(buf, values, n * sizeof(u64))) |
| 2508 | return -EFAULT; |
| 2509 | |
| 2510 | return n * sizeof(u64); |
| 2511 | } |
| 2512 | |
| 2513 | /* |
| 2514 | * Read the performance event - simple non blocking version for now |
| 2515 | */ |
| 2516 | static ssize_t |
| 2517 | perf_read_hw(struct perf_event *event, char __user *buf, size_t count) |
| 2518 | { |
| 2519 | u64 read_format = event->attr.read_format; |
| 2520 | int ret; |
| 2521 | |
| 2522 | /* |
| 2523 | * Return end-of-file for a read on a event that is in |
| 2524 | * error state (i.e. because it was pinned but it couldn't be |
| 2525 | * scheduled on to the CPU at some point). |
| 2526 | */ |
| 2527 | if (event->state == PERF_EVENT_STATE_ERROR) |
| 2528 | return 0; |
| 2529 | |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 2530 | if (count < event->read_size) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2531 | return -ENOSPC; |
| 2532 | |
| 2533 | WARN_ON_ONCE(event->ctx->parent_ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2534 | if (read_format & PERF_FORMAT_GROUP) |
| 2535 | ret = perf_event_read_group(event, read_format, buf); |
| 2536 | else |
| 2537 | ret = perf_event_read_one(event, read_format, buf); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2538 | |
| 2539 | return ret; |
| 2540 | } |
| 2541 | |
| 2542 | static ssize_t |
| 2543 | perf_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
| 2544 | { |
| 2545 | struct perf_event *event = file->private_data; |
| 2546 | |
| 2547 | return perf_read_hw(event, buf, count); |
| 2548 | } |
| 2549 | |
| 2550 | static unsigned int perf_poll(struct file *file, poll_table *wait) |
| 2551 | { |
| 2552 | struct perf_event *event = file->private_data; |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2553 | struct perf_buffer *buffer; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2554 | unsigned int events = POLL_HUP; |
| 2555 | |
| 2556 | rcu_read_lock(); |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2557 | buffer = rcu_dereference(event->buffer); |
| 2558 | if (buffer) |
| 2559 | events = atomic_xchg(&buffer->poll, 0); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2560 | rcu_read_unlock(); |
| 2561 | |
| 2562 | poll_wait(file, &event->waitq, wait); |
| 2563 | |
| 2564 | return events; |
| 2565 | } |
| 2566 | |
| 2567 | static void perf_event_reset(struct perf_event *event) |
| 2568 | { |
| 2569 | (void)perf_event_read(event); |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 2570 | local64_set(&event->count, 0); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2571 | perf_event_update_userpage(event); |
| 2572 | } |
| 2573 | |
| 2574 | /* |
| 2575 | * Holding the top-level event's child_mutex means that any |
| 2576 | * descendant process that has inherited this event will block |
| 2577 | * in sync_child_event if it goes to exit, thus satisfying the |
| 2578 | * task existence requirements of perf_event_enable/disable. |
| 2579 | */ |
| 2580 | static void perf_event_for_each_child(struct perf_event *event, |
| 2581 | void (*func)(struct perf_event *)) |
| 2582 | { |
| 2583 | struct perf_event *child; |
| 2584 | |
| 2585 | WARN_ON_ONCE(event->ctx->parent_ctx); |
| 2586 | mutex_lock(&event->child_mutex); |
| 2587 | func(event); |
| 2588 | list_for_each_entry(child, &event->child_list, child_list) |
| 2589 | func(child); |
| 2590 | mutex_unlock(&event->child_mutex); |
| 2591 | } |
| 2592 | |
| 2593 | static void perf_event_for_each(struct perf_event *event, |
| 2594 | void (*func)(struct perf_event *)) |
| 2595 | { |
| 2596 | struct perf_event_context *ctx = event->ctx; |
| 2597 | struct perf_event *sibling; |
| 2598 | |
| 2599 | WARN_ON_ONCE(ctx->parent_ctx); |
| 2600 | mutex_lock(&ctx->mutex); |
| 2601 | event = event->group_leader; |
| 2602 | |
| 2603 | perf_event_for_each_child(event, func); |
| 2604 | func(event); |
| 2605 | list_for_each_entry(sibling, &event->sibling_list, group_entry) |
| 2606 | perf_event_for_each_child(event, func); |
| 2607 | mutex_unlock(&ctx->mutex); |
| 2608 | } |
| 2609 | |
| 2610 | static int perf_event_period(struct perf_event *event, u64 __user *arg) |
| 2611 | { |
| 2612 | struct perf_event_context *ctx = event->ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2613 | int ret = 0; |
| 2614 | u64 value; |
| 2615 | |
Franck Bui-Huu | 6c7e550 | 2010-11-23 16:21:43 +0100 | [diff] [blame] | 2616 | if (!is_sampling_event(event)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2617 | return -EINVAL; |
| 2618 | |
John Blackwood | ad0cf34 | 2010-09-28 18:03:11 -0400 | [diff] [blame] | 2619 | if (copy_from_user(&value, arg, sizeof(value))) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2620 | return -EFAULT; |
| 2621 | |
| 2622 | if (!value) |
| 2623 | return -EINVAL; |
| 2624 | |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 2625 | raw_spin_lock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2626 | if (event->attr.freq) { |
| 2627 | if (value > sysctl_perf_event_sample_rate) { |
| 2628 | ret = -EINVAL; |
| 2629 | goto unlock; |
| 2630 | } |
| 2631 | |
| 2632 | event->attr.sample_freq = value; |
| 2633 | } else { |
| 2634 | event->attr.sample_period = value; |
| 2635 | event->hw.sample_period = value; |
| 2636 | } |
| 2637 | unlock: |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 2638 | raw_spin_unlock_irq(&ctx->lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2639 | |
| 2640 | return ret; |
| 2641 | } |
| 2642 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 2643 | static const struct file_operations perf_fops; |
| 2644 | |
| 2645 | static struct perf_event *perf_fget_light(int fd, int *fput_needed) |
| 2646 | { |
| 2647 | struct file *file; |
| 2648 | |
| 2649 | file = fget_light(fd, fput_needed); |
| 2650 | if (!file) |
| 2651 | return ERR_PTR(-EBADF); |
| 2652 | |
| 2653 | if (file->f_op != &perf_fops) { |
| 2654 | fput_light(file, *fput_needed); |
| 2655 | *fput_needed = 0; |
| 2656 | return ERR_PTR(-EBADF); |
| 2657 | } |
| 2658 | |
| 2659 | return file->private_data; |
| 2660 | } |
| 2661 | |
| 2662 | static int perf_event_set_output(struct perf_event *event, |
| 2663 | struct perf_event *output_event); |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 2664 | static int perf_event_set_filter(struct perf_event *event, void __user *arg); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2665 | |
| 2666 | static long perf_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
| 2667 | { |
| 2668 | struct perf_event *event = file->private_data; |
| 2669 | void (*func)(struct perf_event *); |
| 2670 | u32 flags = arg; |
| 2671 | |
| 2672 | switch (cmd) { |
| 2673 | case PERF_EVENT_IOC_ENABLE: |
| 2674 | func = perf_event_enable; |
| 2675 | break; |
| 2676 | case PERF_EVENT_IOC_DISABLE: |
| 2677 | func = perf_event_disable; |
| 2678 | break; |
| 2679 | case PERF_EVENT_IOC_RESET: |
| 2680 | func = perf_event_reset; |
| 2681 | break; |
| 2682 | |
| 2683 | case PERF_EVENT_IOC_REFRESH: |
| 2684 | return perf_event_refresh(event, arg); |
| 2685 | |
| 2686 | case PERF_EVENT_IOC_PERIOD: |
| 2687 | return perf_event_period(event, (u64 __user *)arg); |
| 2688 | |
| 2689 | case PERF_EVENT_IOC_SET_OUTPUT: |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 2690 | { |
| 2691 | struct perf_event *output_event = NULL; |
| 2692 | int fput_needed = 0; |
| 2693 | int ret; |
| 2694 | |
| 2695 | if (arg != -1) { |
| 2696 | output_event = perf_fget_light(arg, &fput_needed); |
| 2697 | if (IS_ERR(output_event)) |
| 2698 | return PTR_ERR(output_event); |
| 2699 | } |
| 2700 | |
| 2701 | ret = perf_event_set_output(event, output_event); |
| 2702 | if (output_event) |
| 2703 | fput_light(output_event->filp, fput_needed); |
| 2704 | |
| 2705 | return ret; |
| 2706 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2707 | |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 2708 | case PERF_EVENT_IOC_SET_FILTER: |
| 2709 | return perf_event_set_filter(event, (void __user *)arg); |
| 2710 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2711 | default: |
| 2712 | return -ENOTTY; |
| 2713 | } |
| 2714 | |
| 2715 | if (flags & PERF_IOC_FLAG_GROUP) |
| 2716 | perf_event_for_each(event, func); |
| 2717 | else |
| 2718 | perf_event_for_each_child(event, func); |
| 2719 | |
| 2720 | return 0; |
| 2721 | } |
| 2722 | |
| 2723 | int perf_event_task_enable(void) |
| 2724 | { |
| 2725 | struct perf_event *event; |
| 2726 | |
| 2727 | mutex_lock(¤t->perf_event_mutex); |
| 2728 | list_for_each_entry(event, ¤t->perf_event_list, owner_entry) |
| 2729 | perf_event_for_each_child(event, perf_event_enable); |
| 2730 | mutex_unlock(¤t->perf_event_mutex); |
| 2731 | |
| 2732 | return 0; |
| 2733 | } |
| 2734 | |
| 2735 | int perf_event_task_disable(void) |
| 2736 | { |
| 2737 | struct perf_event *event; |
| 2738 | |
| 2739 | mutex_lock(¤t->perf_event_mutex); |
| 2740 | list_for_each_entry(event, ¤t->perf_event_list, owner_entry) |
| 2741 | perf_event_for_each_child(event, perf_event_disable); |
| 2742 | mutex_unlock(¤t->perf_event_mutex); |
| 2743 | |
| 2744 | return 0; |
| 2745 | } |
| 2746 | |
| 2747 | #ifndef PERF_EVENT_INDEX_OFFSET |
| 2748 | # define PERF_EVENT_INDEX_OFFSET 0 |
| 2749 | #endif |
| 2750 | |
| 2751 | static int perf_event_index(struct perf_event *event) |
| 2752 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 2753 | if (event->hw.state & PERF_HES_STOPPED) |
| 2754 | return 0; |
| 2755 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2756 | if (event->state != PERF_EVENT_STATE_ACTIVE) |
| 2757 | return 0; |
| 2758 | |
| 2759 | return event->hw.idx + 1 - PERF_EVENT_INDEX_OFFSET; |
| 2760 | } |
| 2761 | |
| 2762 | /* |
| 2763 | * Callers need to ensure there can be no nesting of this function, otherwise |
| 2764 | * the seqlock logic goes bad. We can not serialize this because the arch |
| 2765 | * code calls this from NMI context. |
| 2766 | */ |
| 2767 | void perf_event_update_userpage(struct perf_event *event) |
| 2768 | { |
| 2769 | struct perf_event_mmap_page *userpg; |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2770 | struct perf_buffer *buffer; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2771 | |
| 2772 | rcu_read_lock(); |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2773 | buffer = rcu_dereference(event->buffer); |
| 2774 | if (!buffer) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2775 | goto unlock; |
| 2776 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2777 | userpg = buffer->user_page; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2778 | |
| 2779 | /* |
| 2780 | * Disable preemption so as to not let the corresponding user-space |
| 2781 | * spin too long if we get preempted. |
| 2782 | */ |
| 2783 | preempt_disable(); |
| 2784 | ++userpg->lock; |
| 2785 | barrier(); |
| 2786 | userpg->index = perf_event_index(event); |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 2787 | userpg->offset = perf_event_count(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2788 | if (event->state == PERF_EVENT_STATE_ACTIVE) |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 2789 | userpg->offset -= local64_read(&event->hw.prev_count); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2790 | |
| 2791 | userpg->time_enabled = event->total_time_enabled + |
| 2792 | atomic64_read(&event->child_total_time_enabled); |
| 2793 | |
| 2794 | userpg->time_running = event->total_time_running + |
| 2795 | atomic64_read(&event->child_total_time_running); |
| 2796 | |
| 2797 | barrier(); |
| 2798 | ++userpg->lock; |
| 2799 | preempt_enable(); |
| 2800 | unlock: |
| 2801 | rcu_read_unlock(); |
| 2802 | } |
| 2803 | |
Peter Zijlstra | d57e34f | 2010-05-28 19:41:35 +0200 | [diff] [blame] | 2804 | static unsigned long perf_data_size(struct perf_buffer *buffer); |
| 2805 | |
| 2806 | static void |
| 2807 | perf_buffer_init(struct perf_buffer *buffer, long watermark, int flags) |
| 2808 | { |
| 2809 | long max_size = perf_data_size(buffer); |
| 2810 | |
| 2811 | if (watermark) |
| 2812 | buffer->watermark = min(max_size, watermark); |
| 2813 | |
| 2814 | if (!buffer->watermark) |
| 2815 | buffer->watermark = max_size / 2; |
| 2816 | |
| 2817 | if (flags & PERF_BUFFER_WRITABLE) |
| 2818 | buffer->writable = 1; |
| 2819 | |
| 2820 | atomic_set(&buffer->refcount, 1); |
| 2821 | } |
| 2822 | |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2823 | #ifndef CONFIG_PERF_USE_VMALLOC |
| 2824 | |
| 2825 | /* |
| 2826 | * Back perf_mmap() with regular GFP_KERNEL-0 pages. |
| 2827 | */ |
| 2828 | |
| 2829 | static struct page * |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2830 | perf_mmap_to_page(struct perf_buffer *buffer, unsigned long pgoff) |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2831 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2832 | if (pgoff > buffer->nr_pages) |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2833 | return NULL; |
| 2834 | |
| 2835 | if (pgoff == 0) |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2836 | return virt_to_page(buffer->user_page); |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2837 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2838 | return virt_to_page(buffer->data_pages[pgoff - 1]); |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2839 | } |
| 2840 | |
Peter Zijlstra | a19d35c | 2010-05-17 18:48:00 +0200 | [diff] [blame] | 2841 | static void *perf_mmap_alloc_page(int cpu) |
| 2842 | { |
| 2843 | struct page *page; |
| 2844 | int node; |
| 2845 | |
| 2846 | node = (cpu == -1) ? cpu : cpu_to_node(cpu); |
| 2847 | page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0); |
| 2848 | if (!page) |
| 2849 | return NULL; |
| 2850 | |
| 2851 | return page_address(page); |
| 2852 | } |
| 2853 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2854 | static struct perf_buffer * |
Peter Zijlstra | d57e34f | 2010-05-28 19:41:35 +0200 | [diff] [blame] | 2855 | perf_buffer_alloc(int nr_pages, long watermark, int cpu, int flags) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2856 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2857 | struct perf_buffer *buffer; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2858 | unsigned long size; |
| 2859 | int i; |
| 2860 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2861 | size = sizeof(struct perf_buffer); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2862 | size += nr_pages * sizeof(void *); |
| 2863 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2864 | buffer = kzalloc(size, GFP_KERNEL); |
| 2865 | if (!buffer) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2866 | goto fail; |
| 2867 | |
Peter Zijlstra | d57e34f | 2010-05-28 19:41:35 +0200 | [diff] [blame] | 2868 | buffer->user_page = perf_mmap_alloc_page(cpu); |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2869 | if (!buffer->user_page) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2870 | goto fail_user_page; |
| 2871 | |
| 2872 | for (i = 0; i < nr_pages; i++) { |
Peter Zijlstra | d57e34f | 2010-05-28 19:41:35 +0200 | [diff] [blame] | 2873 | buffer->data_pages[i] = perf_mmap_alloc_page(cpu); |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2874 | if (!buffer->data_pages[i]) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2875 | goto fail_data_pages; |
| 2876 | } |
| 2877 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2878 | buffer->nr_pages = nr_pages; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2879 | |
Peter Zijlstra | d57e34f | 2010-05-28 19:41:35 +0200 | [diff] [blame] | 2880 | perf_buffer_init(buffer, watermark, flags); |
| 2881 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2882 | return buffer; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2883 | |
| 2884 | fail_data_pages: |
| 2885 | for (i--; i >= 0; i--) |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2886 | free_page((unsigned long)buffer->data_pages[i]); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2887 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2888 | free_page((unsigned long)buffer->user_page); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2889 | |
| 2890 | fail_user_page: |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2891 | kfree(buffer); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2892 | |
| 2893 | fail: |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2894 | return NULL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2895 | } |
| 2896 | |
| 2897 | static void perf_mmap_free_page(unsigned long addr) |
| 2898 | { |
| 2899 | struct page *page = virt_to_page((void *)addr); |
| 2900 | |
| 2901 | page->mapping = NULL; |
| 2902 | __free_page(page); |
| 2903 | } |
| 2904 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2905 | static void perf_buffer_free(struct perf_buffer *buffer) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2906 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2907 | int i; |
| 2908 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2909 | perf_mmap_free_page((unsigned long)buffer->user_page); |
| 2910 | for (i = 0; i < buffer->nr_pages; i++) |
| 2911 | perf_mmap_free_page((unsigned long)buffer->data_pages[i]); |
| 2912 | kfree(buffer); |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2913 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 2914 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2915 | static inline int page_order(struct perf_buffer *buffer) |
Peter Zijlstra | 3cafa9f | 2010-05-20 19:07:56 +0200 | [diff] [blame] | 2916 | { |
| 2917 | return 0; |
| 2918 | } |
| 2919 | |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2920 | #else |
| 2921 | |
| 2922 | /* |
| 2923 | * Back perf_mmap() with vmalloc memory. |
| 2924 | * |
| 2925 | * Required for architectures that have d-cache aliasing issues. |
| 2926 | */ |
| 2927 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2928 | static inline int page_order(struct perf_buffer *buffer) |
Peter Zijlstra | 3cafa9f | 2010-05-20 19:07:56 +0200 | [diff] [blame] | 2929 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2930 | return buffer->page_order; |
Peter Zijlstra | 3cafa9f | 2010-05-20 19:07:56 +0200 | [diff] [blame] | 2931 | } |
| 2932 | |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2933 | static struct page * |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2934 | perf_mmap_to_page(struct perf_buffer *buffer, unsigned long pgoff) |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2935 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2936 | if (pgoff > (1UL << page_order(buffer))) |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2937 | return NULL; |
| 2938 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2939 | return vmalloc_to_page((void *)buffer->user_page + pgoff * PAGE_SIZE); |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2940 | } |
| 2941 | |
| 2942 | static void perf_mmap_unmark_page(void *addr) |
| 2943 | { |
| 2944 | struct page *page = vmalloc_to_page(addr); |
| 2945 | |
| 2946 | page->mapping = NULL; |
| 2947 | } |
| 2948 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2949 | static void perf_buffer_free_work(struct work_struct *work) |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2950 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2951 | struct perf_buffer *buffer; |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2952 | void *base; |
| 2953 | int i, nr; |
| 2954 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2955 | buffer = container_of(work, struct perf_buffer, work); |
| 2956 | nr = 1 << page_order(buffer); |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2957 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2958 | base = buffer->user_page; |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2959 | for (i = 0; i < nr + 1; i++) |
| 2960 | perf_mmap_unmark_page(base + (i * PAGE_SIZE)); |
| 2961 | |
| 2962 | vfree(base); |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2963 | kfree(buffer); |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2964 | } |
| 2965 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2966 | static void perf_buffer_free(struct perf_buffer *buffer) |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2967 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2968 | schedule_work(&buffer->work); |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2969 | } |
| 2970 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2971 | static struct perf_buffer * |
Peter Zijlstra | d57e34f | 2010-05-28 19:41:35 +0200 | [diff] [blame] | 2972 | perf_buffer_alloc(int nr_pages, long watermark, int cpu, int flags) |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2973 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2974 | struct perf_buffer *buffer; |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2975 | unsigned long size; |
| 2976 | void *all_buf; |
| 2977 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2978 | size = sizeof(struct perf_buffer); |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2979 | size += sizeof(void *); |
| 2980 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2981 | buffer = kzalloc(size, GFP_KERNEL); |
| 2982 | if (!buffer) |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2983 | goto fail; |
| 2984 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2985 | INIT_WORK(&buffer->work, perf_buffer_free_work); |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2986 | |
| 2987 | all_buf = vmalloc_user((nr_pages + 1) * PAGE_SIZE); |
| 2988 | if (!all_buf) |
| 2989 | goto fail_all_buf; |
| 2990 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2991 | buffer->user_page = all_buf; |
| 2992 | buffer->data_pages[0] = all_buf + PAGE_SIZE; |
| 2993 | buffer->page_order = ilog2(nr_pages); |
| 2994 | buffer->nr_pages = 1; |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2995 | |
Peter Zijlstra | d57e34f | 2010-05-28 19:41:35 +0200 | [diff] [blame] | 2996 | perf_buffer_init(buffer, watermark, flags); |
| 2997 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 2998 | return buffer; |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 2999 | |
| 3000 | fail_all_buf: |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3001 | kfree(buffer); |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 3002 | |
| 3003 | fail: |
| 3004 | return NULL; |
| 3005 | } |
| 3006 | |
| 3007 | #endif |
| 3008 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3009 | static unsigned long perf_data_size(struct perf_buffer *buffer) |
Peter Zijlstra | 3cafa9f | 2010-05-20 19:07:56 +0200 | [diff] [blame] | 3010 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3011 | return buffer->nr_pages << (PAGE_SHIFT + page_order(buffer)); |
Peter Zijlstra | 3cafa9f | 2010-05-20 19:07:56 +0200 | [diff] [blame] | 3012 | } |
| 3013 | |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 3014 | static int perf_mmap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| 3015 | { |
| 3016 | struct perf_event *event = vma->vm_file->private_data; |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3017 | struct perf_buffer *buffer; |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 3018 | int ret = VM_FAULT_SIGBUS; |
| 3019 | |
| 3020 | if (vmf->flags & FAULT_FLAG_MKWRITE) { |
| 3021 | if (vmf->pgoff == 0) |
| 3022 | ret = 0; |
| 3023 | return ret; |
| 3024 | } |
| 3025 | |
| 3026 | rcu_read_lock(); |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3027 | buffer = rcu_dereference(event->buffer); |
| 3028 | if (!buffer) |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 3029 | goto unlock; |
| 3030 | |
| 3031 | if (vmf->pgoff && (vmf->flags & FAULT_FLAG_WRITE)) |
| 3032 | goto unlock; |
| 3033 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3034 | vmf->page = perf_mmap_to_page(buffer, vmf->pgoff); |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 3035 | if (!vmf->page) |
| 3036 | goto unlock; |
| 3037 | |
| 3038 | get_page(vmf->page); |
| 3039 | vmf->page->mapping = vma->vm_file->f_mapping; |
| 3040 | vmf->page->index = vmf->pgoff; |
| 3041 | |
| 3042 | ret = 0; |
| 3043 | unlock: |
| 3044 | rcu_read_unlock(); |
| 3045 | |
| 3046 | return ret; |
| 3047 | } |
| 3048 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3049 | static void perf_buffer_free_rcu(struct rcu_head *rcu_head) |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 3050 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3051 | struct perf_buffer *buffer; |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 3052 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3053 | buffer = container_of(rcu_head, struct perf_buffer, rcu_head); |
| 3054 | perf_buffer_free(buffer); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3055 | } |
| 3056 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3057 | static struct perf_buffer *perf_buffer_get(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3058 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3059 | struct perf_buffer *buffer; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3060 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 3061 | rcu_read_lock(); |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3062 | buffer = rcu_dereference(event->buffer); |
| 3063 | if (buffer) { |
| 3064 | if (!atomic_inc_not_zero(&buffer->refcount)) |
| 3065 | buffer = NULL; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 3066 | } |
| 3067 | rcu_read_unlock(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3068 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3069 | return buffer; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 3070 | } |
| 3071 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3072 | static void perf_buffer_put(struct perf_buffer *buffer) |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 3073 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3074 | if (!atomic_dec_and_test(&buffer->refcount)) |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 3075 | return; |
| 3076 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3077 | call_rcu(&buffer->rcu_head, perf_buffer_free_rcu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3078 | } |
| 3079 | |
| 3080 | static void perf_mmap_open(struct vm_area_struct *vma) |
| 3081 | { |
| 3082 | struct perf_event *event = vma->vm_file->private_data; |
| 3083 | |
| 3084 | atomic_inc(&event->mmap_count); |
| 3085 | } |
| 3086 | |
| 3087 | static void perf_mmap_close(struct vm_area_struct *vma) |
| 3088 | { |
| 3089 | struct perf_event *event = vma->vm_file->private_data; |
| 3090 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3091 | if (atomic_dec_and_mutex_lock(&event->mmap_count, &event->mmap_mutex)) { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3092 | unsigned long size = perf_data_size(event->buffer); |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 3093 | struct user_struct *user = event->mmap_user; |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3094 | struct perf_buffer *buffer = event->buffer; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3095 | |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 3096 | atomic_long_sub((size >> PAGE_SHIFT) + 1, &user->locked_vm); |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 3097 | vma->vm_mm->locked_vm -= event->mmap_locked; |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3098 | rcu_assign_pointer(event->buffer, NULL); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3099 | mutex_unlock(&event->mmap_mutex); |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 3100 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3101 | perf_buffer_put(buffer); |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 3102 | free_uid(user); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3103 | } |
| 3104 | } |
| 3105 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 3106 | static const struct vm_operations_struct perf_mmap_vmops = { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3107 | .open = perf_mmap_open, |
| 3108 | .close = perf_mmap_close, |
| 3109 | .fault = perf_mmap_fault, |
| 3110 | .page_mkwrite = perf_mmap_fault, |
| 3111 | }; |
| 3112 | |
| 3113 | static int perf_mmap(struct file *file, struct vm_area_struct *vma) |
| 3114 | { |
| 3115 | struct perf_event *event = file->private_data; |
| 3116 | unsigned long user_locked, user_lock_limit; |
| 3117 | struct user_struct *user = current_user(); |
| 3118 | unsigned long locked, lock_limit; |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3119 | struct perf_buffer *buffer; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3120 | unsigned long vma_size; |
| 3121 | unsigned long nr_pages; |
| 3122 | long user_extra, extra; |
Peter Zijlstra | d57e34f | 2010-05-28 19:41:35 +0200 | [diff] [blame] | 3123 | int ret = 0, flags = 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3124 | |
Peter Zijlstra | c792061 | 2010-05-18 10:33:24 +0200 | [diff] [blame] | 3125 | /* |
| 3126 | * Don't allow mmap() of inherited per-task counters. This would |
| 3127 | * create a performance issue due to all children writing to the |
| 3128 | * same buffer. |
| 3129 | */ |
| 3130 | if (event->cpu == -1 && event->attr.inherit) |
| 3131 | return -EINVAL; |
| 3132 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3133 | if (!(vma->vm_flags & VM_SHARED)) |
| 3134 | return -EINVAL; |
| 3135 | |
| 3136 | vma_size = vma->vm_end - vma->vm_start; |
| 3137 | nr_pages = (vma_size / PAGE_SIZE) - 1; |
| 3138 | |
| 3139 | /* |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3140 | * If we have buffer pages ensure they're a power-of-two number, so we |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3141 | * can do bitmasks instead of modulo. |
| 3142 | */ |
| 3143 | if (nr_pages != 0 && !is_power_of_2(nr_pages)) |
| 3144 | return -EINVAL; |
| 3145 | |
| 3146 | if (vma_size != PAGE_SIZE * (1 + nr_pages)) |
| 3147 | return -EINVAL; |
| 3148 | |
| 3149 | if (vma->vm_pgoff != 0) |
| 3150 | return -EINVAL; |
| 3151 | |
| 3152 | WARN_ON_ONCE(event->ctx->parent_ctx); |
| 3153 | mutex_lock(&event->mmap_mutex); |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3154 | if (event->buffer) { |
| 3155 | if (event->buffer->nr_pages == nr_pages) |
| 3156 | atomic_inc(&event->buffer->refcount); |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 3157 | else |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3158 | ret = -EINVAL; |
| 3159 | goto unlock; |
| 3160 | } |
| 3161 | |
| 3162 | user_extra = nr_pages + 1; |
| 3163 | user_lock_limit = sysctl_perf_event_mlock >> (PAGE_SHIFT - 10); |
| 3164 | |
| 3165 | /* |
| 3166 | * Increase the limit linearly with more CPUs: |
| 3167 | */ |
| 3168 | user_lock_limit *= num_online_cpus(); |
| 3169 | |
| 3170 | user_locked = atomic_long_read(&user->locked_vm) + user_extra; |
| 3171 | |
| 3172 | extra = 0; |
| 3173 | if (user_locked > user_lock_limit) |
| 3174 | extra = user_locked - user_lock_limit; |
| 3175 | |
Jiri Slaby | 78d7d40 | 2010-03-05 13:42:54 -0800 | [diff] [blame] | 3176 | lock_limit = rlimit(RLIMIT_MEMLOCK); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3177 | lock_limit >>= PAGE_SHIFT; |
| 3178 | locked = vma->vm_mm->locked_vm + extra; |
| 3179 | |
| 3180 | if ((locked > lock_limit) && perf_paranoid_tracepoint_raw() && |
| 3181 | !capable(CAP_IPC_LOCK)) { |
| 3182 | ret = -EPERM; |
| 3183 | goto unlock; |
| 3184 | } |
| 3185 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3186 | WARN_ON(event->buffer); |
Peter Zijlstra | 906010b | 2009-09-21 16:08:49 +0200 | [diff] [blame] | 3187 | |
Peter Zijlstra | d57e34f | 2010-05-28 19:41:35 +0200 | [diff] [blame] | 3188 | if (vma->vm_flags & VM_WRITE) |
| 3189 | flags |= PERF_BUFFER_WRITABLE; |
| 3190 | |
| 3191 | buffer = perf_buffer_alloc(nr_pages, event->attr.wakeup_watermark, |
| 3192 | event->cpu, flags); |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3193 | if (!buffer) { |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 3194 | ret = -ENOMEM; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3195 | goto unlock; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 3196 | } |
Peter Zijlstra | d57e34f | 2010-05-28 19:41:35 +0200 | [diff] [blame] | 3197 | rcu_assign_pointer(event->buffer, buffer); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3198 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 3199 | atomic_long_add(user_extra, &user->locked_vm); |
| 3200 | event->mmap_locked = extra; |
| 3201 | event->mmap_user = get_current_user(); |
| 3202 | vma->vm_mm->locked_vm += event->mmap_locked; |
| 3203 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3204 | unlock: |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 3205 | if (!ret) |
| 3206 | atomic_inc(&event->mmap_count); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3207 | mutex_unlock(&event->mmap_mutex); |
| 3208 | |
| 3209 | vma->vm_flags |= VM_RESERVED; |
| 3210 | vma->vm_ops = &perf_mmap_vmops; |
| 3211 | |
| 3212 | return ret; |
| 3213 | } |
| 3214 | |
| 3215 | static int perf_fasync(int fd, struct file *filp, int on) |
| 3216 | { |
| 3217 | struct inode *inode = filp->f_path.dentry->d_inode; |
| 3218 | struct perf_event *event = filp->private_data; |
| 3219 | int retval; |
| 3220 | |
| 3221 | mutex_lock(&inode->i_mutex); |
| 3222 | retval = fasync_helper(fd, filp, on, &event->fasync); |
| 3223 | mutex_unlock(&inode->i_mutex); |
| 3224 | |
| 3225 | if (retval < 0) |
| 3226 | return retval; |
| 3227 | |
| 3228 | return 0; |
| 3229 | } |
| 3230 | |
| 3231 | static const struct file_operations perf_fops = { |
Arnd Bergmann | 3326c1c | 2010-03-23 19:09:33 +0100 | [diff] [blame] | 3232 | .llseek = no_llseek, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3233 | .release = perf_release, |
| 3234 | .read = perf_read, |
| 3235 | .poll = perf_poll, |
| 3236 | .unlocked_ioctl = perf_ioctl, |
| 3237 | .compat_ioctl = perf_ioctl, |
| 3238 | .mmap = perf_mmap, |
| 3239 | .fasync = perf_fasync, |
| 3240 | }; |
| 3241 | |
| 3242 | /* |
| 3243 | * Perf event wakeup |
| 3244 | * |
| 3245 | * If there's data, ensure we set the poll() state and publish everything |
| 3246 | * to user-space before waking everybody up. |
| 3247 | */ |
| 3248 | |
| 3249 | void perf_event_wakeup(struct perf_event *event) |
| 3250 | { |
| 3251 | wake_up_all(&event->waitq); |
| 3252 | |
| 3253 | if (event->pending_kill) { |
| 3254 | kill_fasync(&event->fasync, SIGIO, event->pending_kill); |
| 3255 | event->pending_kill = 0; |
| 3256 | } |
| 3257 | } |
| 3258 | |
Peter Zijlstra | e360adb | 2010-10-14 14:01:34 +0800 | [diff] [blame] | 3259 | static void perf_pending_event(struct irq_work *entry) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3260 | { |
| 3261 | struct perf_event *event = container_of(entry, |
| 3262 | struct perf_event, pending); |
| 3263 | |
| 3264 | if (event->pending_disable) { |
| 3265 | event->pending_disable = 0; |
| 3266 | __perf_event_disable(event); |
| 3267 | } |
| 3268 | |
| 3269 | if (event->pending_wakeup) { |
| 3270 | event->pending_wakeup = 0; |
| 3271 | perf_event_wakeup(event); |
| 3272 | } |
| 3273 | } |
| 3274 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3275 | /* |
Zhang, Yanmin | 39447b3 | 2010-04-19 13:32:41 +0800 | [diff] [blame] | 3276 | * We assume there is only KVM supporting the callbacks. |
| 3277 | * Later on, we might change it to a list if there is |
| 3278 | * another virtualization implementation supporting the callbacks. |
| 3279 | */ |
| 3280 | struct perf_guest_info_callbacks *perf_guest_cbs; |
| 3281 | |
| 3282 | int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) |
| 3283 | { |
| 3284 | perf_guest_cbs = cbs; |
| 3285 | return 0; |
| 3286 | } |
| 3287 | EXPORT_SYMBOL_GPL(perf_register_guest_info_callbacks); |
| 3288 | |
| 3289 | int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *cbs) |
| 3290 | { |
| 3291 | perf_guest_cbs = NULL; |
| 3292 | return 0; |
| 3293 | } |
| 3294 | EXPORT_SYMBOL_GPL(perf_unregister_guest_info_callbacks); |
| 3295 | |
| 3296 | /* |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3297 | * Output |
| 3298 | */ |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3299 | static bool perf_output_space(struct perf_buffer *buffer, unsigned long tail, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3300 | unsigned long offset, unsigned long head) |
| 3301 | { |
| 3302 | unsigned long mask; |
| 3303 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3304 | if (!buffer->writable) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3305 | return true; |
| 3306 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3307 | mask = perf_data_size(buffer) - 1; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3308 | |
| 3309 | offset = (offset - tail) & mask; |
| 3310 | head = (head - tail) & mask; |
| 3311 | |
| 3312 | if ((int)(head - offset) < 0) |
| 3313 | return false; |
| 3314 | |
| 3315 | return true; |
| 3316 | } |
| 3317 | |
| 3318 | static void perf_output_wakeup(struct perf_output_handle *handle) |
| 3319 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3320 | atomic_set(&handle->buffer->poll, POLL_IN); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3321 | |
| 3322 | if (handle->nmi) { |
| 3323 | handle->event->pending_wakeup = 1; |
Peter Zijlstra | e360adb | 2010-10-14 14:01:34 +0800 | [diff] [blame] | 3324 | irq_work_queue(&handle->event->pending); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3325 | } else |
| 3326 | perf_event_wakeup(handle->event); |
| 3327 | } |
| 3328 | |
| 3329 | /* |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3330 | * We need to ensure a later event_id doesn't publish a head when a former |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3331 | * event isn't done writing. However since we need to deal with NMIs we |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3332 | * cannot fully serialize things. |
| 3333 | * |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3334 | * We only publish the head (and generate a wakeup) when the outer-most |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3335 | * event completes. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3336 | */ |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3337 | static void perf_output_get_handle(struct perf_output_handle *handle) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3338 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3339 | struct perf_buffer *buffer = handle->buffer; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3340 | |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3341 | preempt_disable(); |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3342 | local_inc(&buffer->nest); |
| 3343 | handle->wakeup = local_read(&buffer->wakeup); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3344 | } |
| 3345 | |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3346 | static void perf_output_put_handle(struct perf_output_handle *handle) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3347 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3348 | struct perf_buffer *buffer = handle->buffer; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3349 | unsigned long head; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3350 | |
| 3351 | again: |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3352 | head = local_read(&buffer->head); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3353 | |
| 3354 | /* |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3355 | * IRQ/NMI can happen here, which means we can miss a head update. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3356 | */ |
| 3357 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3358 | if (!local_dec_and_test(&buffer->nest)) |
Frederic Weisbecker | acd35a4 | 2010-05-20 21:28:34 +0200 | [diff] [blame] | 3359 | goto out; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3360 | |
| 3361 | /* |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3362 | * Publish the known good head. Rely on the full barrier implied |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3363 | * by atomic_dec_and_test() order the buffer->head read and this |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3364 | * write. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3365 | */ |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3366 | buffer->user_page->data_head = head; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3367 | |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3368 | /* |
| 3369 | * Now check if we missed an update, rely on the (compiler) |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3370 | * barrier in atomic_dec_and_test() to re-read buffer->head. |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3371 | */ |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3372 | if (unlikely(head != local_read(&buffer->head))) { |
| 3373 | local_inc(&buffer->nest); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3374 | goto again; |
| 3375 | } |
| 3376 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3377 | if (handle->wakeup != local_read(&buffer->wakeup)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3378 | perf_output_wakeup(handle); |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3379 | |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 3380 | out: |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3381 | preempt_enable(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3382 | } |
| 3383 | |
Peter Zijlstra | a94ffaa | 2010-05-20 19:50:07 +0200 | [diff] [blame] | 3384 | __always_inline void perf_output_copy(struct perf_output_handle *handle, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3385 | const void *buf, unsigned int len) |
| 3386 | { |
Peter Zijlstra | 5d967a8 | 2010-05-20 16:46:39 +0200 | [diff] [blame] | 3387 | do { |
Peter Zijlstra | a94ffaa | 2010-05-20 19:50:07 +0200 | [diff] [blame] | 3388 | unsigned long size = min_t(unsigned long, handle->size, len); |
Peter Zijlstra | 5d967a8 | 2010-05-20 16:46:39 +0200 | [diff] [blame] | 3389 | |
| 3390 | memcpy(handle->addr, buf, size); |
| 3391 | |
| 3392 | len -= size; |
| 3393 | handle->addr += size; |
Frederic Weisbecker | 74048f8 | 2010-05-27 21:34:58 +0200 | [diff] [blame] | 3394 | buf += size; |
Peter Zijlstra | 5d967a8 | 2010-05-20 16:46:39 +0200 | [diff] [blame] | 3395 | handle->size -= size; |
| 3396 | if (!handle->size) { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3397 | struct perf_buffer *buffer = handle->buffer; |
Peter Zijlstra | 3cafa9f | 2010-05-20 19:07:56 +0200 | [diff] [blame] | 3398 | |
Peter Zijlstra | 5d967a8 | 2010-05-20 16:46:39 +0200 | [diff] [blame] | 3399 | handle->page++; |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3400 | handle->page &= buffer->nr_pages - 1; |
| 3401 | handle->addr = buffer->data_pages[handle->page]; |
| 3402 | handle->size = PAGE_SIZE << page_order(buffer); |
Peter Zijlstra | 5d967a8 | 2010-05-20 16:46:39 +0200 | [diff] [blame] | 3403 | } |
| 3404 | } while (len); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3405 | } |
| 3406 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3407 | static void __perf_event_header__init_id(struct perf_event_header *header, |
| 3408 | struct perf_sample_data *data, |
| 3409 | struct perf_event *event) |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 3410 | { |
| 3411 | u64 sample_type = event->attr.sample_type; |
| 3412 | |
| 3413 | data->type = sample_type; |
| 3414 | header->size += event->id_header_size; |
| 3415 | |
| 3416 | if (sample_type & PERF_SAMPLE_TID) { |
| 3417 | /* namespace issues */ |
| 3418 | data->tid_entry.pid = perf_event_pid(event, current); |
| 3419 | data->tid_entry.tid = perf_event_tid(event, current); |
| 3420 | } |
| 3421 | |
| 3422 | if (sample_type & PERF_SAMPLE_TIME) |
| 3423 | data->time = perf_clock(); |
| 3424 | |
| 3425 | if (sample_type & PERF_SAMPLE_ID) |
| 3426 | data->id = primary_event_id(event); |
| 3427 | |
| 3428 | if (sample_type & PERF_SAMPLE_STREAM_ID) |
| 3429 | data->stream_id = event->id; |
| 3430 | |
| 3431 | if (sample_type & PERF_SAMPLE_CPU) { |
| 3432 | data->cpu_entry.cpu = raw_smp_processor_id(); |
| 3433 | data->cpu_entry.reserved = 0; |
| 3434 | } |
| 3435 | } |
| 3436 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3437 | static void perf_event_header__init_id(struct perf_event_header *header, |
| 3438 | struct perf_sample_data *data, |
| 3439 | struct perf_event *event) |
| 3440 | { |
| 3441 | if (event->attr.sample_id_all) |
| 3442 | __perf_event_header__init_id(header, data, event); |
| 3443 | } |
| 3444 | |
| 3445 | static void __perf_event__output_id_sample(struct perf_output_handle *handle, |
| 3446 | struct perf_sample_data *data) |
| 3447 | { |
| 3448 | u64 sample_type = data->type; |
| 3449 | |
| 3450 | if (sample_type & PERF_SAMPLE_TID) |
| 3451 | perf_output_put(handle, data->tid_entry); |
| 3452 | |
| 3453 | if (sample_type & PERF_SAMPLE_TIME) |
| 3454 | perf_output_put(handle, data->time); |
| 3455 | |
| 3456 | if (sample_type & PERF_SAMPLE_ID) |
| 3457 | perf_output_put(handle, data->id); |
| 3458 | |
| 3459 | if (sample_type & PERF_SAMPLE_STREAM_ID) |
| 3460 | perf_output_put(handle, data->stream_id); |
| 3461 | |
| 3462 | if (sample_type & PERF_SAMPLE_CPU) |
| 3463 | perf_output_put(handle, data->cpu_entry); |
| 3464 | } |
| 3465 | |
| 3466 | static void perf_event__output_id_sample(struct perf_event *event, |
| 3467 | struct perf_output_handle *handle, |
| 3468 | struct perf_sample_data *sample) |
| 3469 | { |
| 3470 | if (event->attr.sample_id_all) |
| 3471 | __perf_event__output_id_sample(handle, sample); |
| 3472 | } |
| 3473 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3474 | int perf_output_begin(struct perf_output_handle *handle, |
| 3475 | struct perf_event *event, unsigned int size, |
| 3476 | int nmi, int sample) |
| 3477 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3478 | struct perf_buffer *buffer; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3479 | unsigned long tail, offset, head; |
| 3480 | int have_lost; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3481 | struct perf_sample_data sample_data; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3482 | struct { |
| 3483 | struct perf_event_header header; |
| 3484 | u64 id; |
| 3485 | u64 lost; |
| 3486 | } lost_event; |
| 3487 | |
| 3488 | rcu_read_lock(); |
| 3489 | /* |
| 3490 | * For inherited events we send all the output towards the parent. |
| 3491 | */ |
| 3492 | if (event->parent) |
| 3493 | event = event->parent; |
| 3494 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3495 | buffer = rcu_dereference(event->buffer); |
| 3496 | if (!buffer) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3497 | goto out; |
| 3498 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3499 | handle->buffer = buffer; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3500 | handle->event = event; |
| 3501 | handle->nmi = nmi; |
| 3502 | handle->sample = sample; |
| 3503 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3504 | if (!buffer->nr_pages) |
Stephane Eranian | 00d1d0b | 2010-05-17 12:46:01 +0200 | [diff] [blame] | 3505 | goto out; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3506 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3507 | have_lost = local_read(&buffer->lost); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3508 | if (have_lost) { |
| 3509 | lost_event.header.size = sizeof(lost_event); |
| 3510 | perf_event_header__init_id(&lost_event.header, &sample_data, |
| 3511 | event); |
| 3512 | size += lost_event.header.size; |
| 3513 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3514 | |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3515 | perf_output_get_handle(handle); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3516 | |
| 3517 | do { |
| 3518 | /* |
| 3519 | * Userspace could choose to issue a mb() before updating the |
| 3520 | * tail pointer. So that all reads will be completed before the |
| 3521 | * write is issued. |
| 3522 | */ |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3523 | tail = ACCESS_ONCE(buffer->user_page->data_tail); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3524 | smp_rmb(); |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3525 | offset = head = local_read(&buffer->head); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3526 | head += size; |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3527 | if (unlikely(!perf_output_space(buffer, tail, offset, head))) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3528 | goto fail; |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3529 | } while (local_cmpxchg(&buffer->head, offset, head) != offset); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3530 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3531 | if (head - local_read(&buffer->wakeup) > buffer->watermark) |
| 3532 | local_add(buffer->watermark, &buffer->wakeup); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3533 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3534 | handle->page = offset >> (PAGE_SHIFT + page_order(buffer)); |
| 3535 | handle->page &= buffer->nr_pages - 1; |
| 3536 | handle->size = offset & ((PAGE_SIZE << page_order(buffer)) - 1); |
| 3537 | handle->addr = buffer->data_pages[handle->page]; |
Peter Zijlstra | 5d967a8 | 2010-05-20 16:46:39 +0200 | [diff] [blame] | 3538 | handle->addr += handle->size; |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3539 | handle->size = (PAGE_SIZE << page_order(buffer)) - handle->size; |
Peter Zijlstra | 5d967a8 | 2010-05-20 16:46:39 +0200 | [diff] [blame] | 3540 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3541 | if (have_lost) { |
| 3542 | lost_event.header.type = PERF_RECORD_LOST; |
| 3543 | lost_event.header.misc = 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3544 | lost_event.id = event->id; |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3545 | lost_event.lost = local_xchg(&buffer->lost, 0); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3546 | |
| 3547 | perf_output_put(handle, lost_event); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3548 | perf_event__output_id_sample(event, handle, &sample_data); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3549 | } |
| 3550 | |
| 3551 | return 0; |
| 3552 | |
| 3553 | fail: |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3554 | local_inc(&buffer->lost); |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3555 | perf_output_put_handle(handle); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3556 | out: |
| 3557 | rcu_read_unlock(); |
| 3558 | |
| 3559 | return -ENOSPC; |
| 3560 | } |
| 3561 | |
| 3562 | void perf_output_end(struct perf_output_handle *handle) |
| 3563 | { |
| 3564 | struct perf_event *event = handle->event; |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3565 | struct perf_buffer *buffer = handle->buffer; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3566 | |
| 3567 | int wakeup_events = event->attr.wakeup_events; |
| 3568 | |
| 3569 | if (handle->sample && wakeup_events) { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3570 | int events = local_inc_return(&buffer->events); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3571 | if (events >= wakeup_events) { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 3572 | local_sub(wakeup_events, &buffer->events); |
| 3573 | local_inc(&buffer->wakeup); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3574 | } |
| 3575 | } |
| 3576 | |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3577 | perf_output_put_handle(handle); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3578 | rcu_read_unlock(); |
| 3579 | } |
| 3580 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3581 | static void perf_output_read_one(struct perf_output_handle *handle, |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 3582 | struct perf_event *event, |
| 3583 | u64 enabled, u64 running) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3584 | { |
| 3585 | u64 read_format = event->attr.read_format; |
| 3586 | u64 values[4]; |
| 3587 | int n = 0; |
| 3588 | |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 3589 | values[n++] = perf_event_count(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3590 | if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 3591 | values[n++] = enabled + |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3592 | atomic64_read(&event->child_total_time_enabled); |
| 3593 | } |
| 3594 | if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 3595 | values[n++] = running + |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3596 | atomic64_read(&event->child_total_time_running); |
| 3597 | } |
| 3598 | if (read_format & PERF_FORMAT_ID) |
| 3599 | values[n++] = primary_event_id(event); |
| 3600 | |
| 3601 | perf_output_copy(handle, values, n * sizeof(u64)); |
| 3602 | } |
| 3603 | |
| 3604 | /* |
| 3605 | * XXX PERF_FORMAT_GROUP vs inherited events seems difficult. |
| 3606 | */ |
| 3607 | static void perf_output_read_group(struct perf_output_handle *handle, |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 3608 | struct perf_event *event, |
| 3609 | u64 enabled, u64 running) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3610 | { |
| 3611 | struct perf_event *leader = event->group_leader, *sub; |
| 3612 | u64 read_format = event->attr.read_format; |
| 3613 | u64 values[5]; |
| 3614 | int n = 0; |
| 3615 | |
| 3616 | values[n++] = 1 + leader->nr_siblings; |
| 3617 | |
| 3618 | if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 3619 | values[n++] = enabled; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3620 | |
| 3621 | if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 3622 | values[n++] = running; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3623 | |
| 3624 | if (leader != event) |
| 3625 | leader->pmu->read(leader); |
| 3626 | |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 3627 | values[n++] = perf_event_count(leader); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3628 | if (read_format & PERF_FORMAT_ID) |
| 3629 | values[n++] = primary_event_id(leader); |
| 3630 | |
| 3631 | perf_output_copy(handle, values, n * sizeof(u64)); |
| 3632 | |
| 3633 | list_for_each_entry(sub, &leader->sibling_list, group_entry) { |
| 3634 | n = 0; |
| 3635 | |
| 3636 | if (sub != event) |
| 3637 | sub->pmu->read(sub); |
| 3638 | |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 3639 | values[n++] = perf_event_count(sub); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3640 | if (read_format & PERF_FORMAT_ID) |
| 3641 | values[n++] = primary_event_id(sub); |
| 3642 | |
| 3643 | perf_output_copy(handle, values, n * sizeof(u64)); |
| 3644 | } |
| 3645 | } |
| 3646 | |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 3647 | #define PERF_FORMAT_TOTAL_TIMES (PERF_FORMAT_TOTAL_TIME_ENABLED|\ |
| 3648 | PERF_FORMAT_TOTAL_TIME_RUNNING) |
| 3649 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3650 | static void perf_output_read(struct perf_output_handle *handle, |
| 3651 | struct perf_event *event) |
| 3652 | { |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 3653 | u64 enabled = 0, running = 0, now, ctx_time; |
| 3654 | u64 read_format = event->attr.read_format; |
| 3655 | |
| 3656 | /* |
| 3657 | * compute total_time_enabled, total_time_running |
| 3658 | * based on snapshot values taken when the event |
| 3659 | * was last scheduled in. |
| 3660 | * |
| 3661 | * we cannot simply called update_context_time() |
| 3662 | * because of locking issue as we are called in |
| 3663 | * NMI context |
| 3664 | */ |
| 3665 | if (read_format & PERF_FORMAT_TOTAL_TIMES) { |
| 3666 | now = perf_clock(); |
| 3667 | ctx_time = event->shadow_ctx_time + now; |
| 3668 | enabled = ctx_time - event->tstamp_enabled; |
| 3669 | running = ctx_time - event->tstamp_running; |
| 3670 | } |
| 3671 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3672 | if (event->attr.read_format & PERF_FORMAT_GROUP) |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 3673 | perf_output_read_group(handle, event, enabled, running); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3674 | else |
Stephane Eranian | eed0152 | 2010-10-26 16:08:01 +0200 | [diff] [blame] | 3675 | perf_output_read_one(handle, event, enabled, running); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3676 | } |
| 3677 | |
| 3678 | void perf_output_sample(struct perf_output_handle *handle, |
| 3679 | struct perf_event_header *header, |
| 3680 | struct perf_sample_data *data, |
| 3681 | struct perf_event *event) |
| 3682 | { |
| 3683 | u64 sample_type = data->type; |
| 3684 | |
| 3685 | perf_output_put(handle, *header); |
| 3686 | |
| 3687 | if (sample_type & PERF_SAMPLE_IP) |
| 3688 | perf_output_put(handle, data->ip); |
| 3689 | |
| 3690 | if (sample_type & PERF_SAMPLE_TID) |
| 3691 | perf_output_put(handle, data->tid_entry); |
| 3692 | |
| 3693 | if (sample_type & PERF_SAMPLE_TIME) |
| 3694 | perf_output_put(handle, data->time); |
| 3695 | |
| 3696 | if (sample_type & PERF_SAMPLE_ADDR) |
| 3697 | perf_output_put(handle, data->addr); |
| 3698 | |
| 3699 | if (sample_type & PERF_SAMPLE_ID) |
| 3700 | perf_output_put(handle, data->id); |
| 3701 | |
| 3702 | if (sample_type & PERF_SAMPLE_STREAM_ID) |
| 3703 | perf_output_put(handle, data->stream_id); |
| 3704 | |
| 3705 | if (sample_type & PERF_SAMPLE_CPU) |
| 3706 | perf_output_put(handle, data->cpu_entry); |
| 3707 | |
| 3708 | if (sample_type & PERF_SAMPLE_PERIOD) |
| 3709 | perf_output_put(handle, data->period); |
| 3710 | |
| 3711 | if (sample_type & PERF_SAMPLE_READ) |
| 3712 | perf_output_read(handle, event); |
| 3713 | |
| 3714 | if (sample_type & PERF_SAMPLE_CALLCHAIN) { |
| 3715 | if (data->callchain) { |
| 3716 | int size = 1; |
| 3717 | |
| 3718 | if (data->callchain) |
| 3719 | size += data->callchain->nr; |
| 3720 | |
| 3721 | size *= sizeof(u64); |
| 3722 | |
| 3723 | perf_output_copy(handle, data->callchain, size); |
| 3724 | } else { |
| 3725 | u64 nr = 0; |
| 3726 | perf_output_put(handle, nr); |
| 3727 | } |
| 3728 | } |
| 3729 | |
| 3730 | if (sample_type & PERF_SAMPLE_RAW) { |
| 3731 | if (data->raw) { |
| 3732 | perf_output_put(handle, data->raw->size); |
| 3733 | perf_output_copy(handle, data->raw->data, |
| 3734 | data->raw->size); |
| 3735 | } else { |
| 3736 | struct { |
| 3737 | u32 size; |
| 3738 | u32 data; |
| 3739 | } raw = { |
| 3740 | .size = sizeof(u32), |
| 3741 | .data = 0, |
| 3742 | }; |
| 3743 | perf_output_put(handle, raw); |
| 3744 | } |
| 3745 | } |
| 3746 | } |
| 3747 | |
| 3748 | void perf_prepare_sample(struct perf_event_header *header, |
| 3749 | struct perf_sample_data *data, |
| 3750 | struct perf_event *event, |
| 3751 | struct pt_regs *regs) |
| 3752 | { |
| 3753 | u64 sample_type = event->attr.sample_type; |
| 3754 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3755 | header->type = PERF_RECORD_SAMPLE; |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 3756 | header->size = sizeof(*header) + event->header_size; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3757 | |
| 3758 | header->misc = 0; |
| 3759 | header->misc |= perf_misc_flags(regs); |
| 3760 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3761 | __perf_event_header__init_id(header, data, event); |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 3762 | |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 3763 | if (sample_type & PERF_SAMPLE_IP) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3764 | data->ip = perf_instruction_pointer(regs); |
| 3765 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3766 | if (sample_type & PERF_SAMPLE_CALLCHAIN) { |
| 3767 | int size = 1; |
| 3768 | |
| 3769 | data->callchain = perf_callchain(regs); |
| 3770 | |
| 3771 | if (data->callchain) |
| 3772 | size += data->callchain->nr; |
| 3773 | |
| 3774 | header->size += size * sizeof(u64); |
| 3775 | } |
| 3776 | |
| 3777 | if (sample_type & PERF_SAMPLE_RAW) { |
| 3778 | int size = sizeof(u32); |
| 3779 | |
| 3780 | if (data->raw) |
| 3781 | size += data->raw->size; |
| 3782 | else |
| 3783 | size += sizeof(u32); |
| 3784 | |
| 3785 | WARN_ON_ONCE(size & (sizeof(u64)-1)); |
| 3786 | header->size += size; |
| 3787 | } |
| 3788 | } |
| 3789 | |
| 3790 | static void perf_event_output(struct perf_event *event, int nmi, |
| 3791 | struct perf_sample_data *data, |
| 3792 | struct pt_regs *regs) |
| 3793 | { |
| 3794 | struct perf_output_handle handle; |
| 3795 | struct perf_event_header header; |
| 3796 | |
Frederic Weisbecker | 927c7a9 | 2010-07-01 16:20:36 +0200 | [diff] [blame] | 3797 | /* protect the callchain buffers */ |
| 3798 | rcu_read_lock(); |
| 3799 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3800 | perf_prepare_sample(&header, data, event, regs); |
| 3801 | |
| 3802 | if (perf_output_begin(&handle, event, header.size, nmi, 1)) |
Frederic Weisbecker | 927c7a9 | 2010-07-01 16:20:36 +0200 | [diff] [blame] | 3803 | goto exit; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3804 | |
| 3805 | perf_output_sample(&handle, &header, data, event); |
| 3806 | |
| 3807 | perf_output_end(&handle); |
Frederic Weisbecker | 927c7a9 | 2010-07-01 16:20:36 +0200 | [diff] [blame] | 3808 | |
| 3809 | exit: |
| 3810 | rcu_read_unlock(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3811 | } |
| 3812 | |
| 3813 | /* |
| 3814 | * read event_id |
| 3815 | */ |
| 3816 | |
| 3817 | struct perf_read_event { |
| 3818 | struct perf_event_header header; |
| 3819 | |
| 3820 | u32 pid; |
| 3821 | u32 tid; |
| 3822 | }; |
| 3823 | |
| 3824 | static void |
| 3825 | perf_event_read_event(struct perf_event *event, |
| 3826 | struct task_struct *task) |
| 3827 | { |
| 3828 | struct perf_output_handle handle; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3829 | struct perf_sample_data sample; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3830 | struct perf_read_event read_event = { |
| 3831 | .header = { |
| 3832 | .type = PERF_RECORD_READ, |
| 3833 | .misc = 0, |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 3834 | .size = sizeof(read_event) + event->read_size, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3835 | }, |
| 3836 | .pid = perf_event_pid(event, task), |
| 3837 | .tid = perf_event_tid(event, task), |
| 3838 | }; |
| 3839 | int ret; |
| 3840 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3841 | perf_event_header__init_id(&read_event.header, &sample, event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3842 | ret = perf_output_begin(&handle, event, read_event.header.size, 0, 0); |
| 3843 | if (ret) |
| 3844 | return; |
| 3845 | |
| 3846 | perf_output_put(&handle, read_event); |
| 3847 | perf_output_read(&handle, event); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3848 | perf_event__output_id_sample(event, &handle, &sample); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3849 | |
| 3850 | perf_output_end(&handle); |
| 3851 | } |
| 3852 | |
| 3853 | /* |
| 3854 | * task tracking -- fork/exit |
| 3855 | * |
Eric B Munson | 3af9e85 | 2010-05-18 15:30:49 +0100 | [diff] [blame] | 3856 | * enabled by: attr.comm | attr.mmap | attr.mmap_data | attr.task |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3857 | */ |
| 3858 | |
| 3859 | struct perf_task_event { |
| 3860 | struct task_struct *task; |
| 3861 | struct perf_event_context *task_ctx; |
| 3862 | |
| 3863 | struct { |
| 3864 | struct perf_event_header header; |
| 3865 | |
| 3866 | u32 pid; |
| 3867 | u32 ppid; |
| 3868 | u32 tid; |
| 3869 | u32 ptid; |
| 3870 | u64 time; |
| 3871 | } event_id; |
| 3872 | }; |
| 3873 | |
| 3874 | static void perf_event_task_output(struct perf_event *event, |
| 3875 | struct perf_task_event *task_event) |
| 3876 | { |
| 3877 | struct perf_output_handle handle; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3878 | struct perf_sample_data sample; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3879 | struct task_struct *task = task_event->task; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3880 | int ret, size = task_event->event_id.header.size; |
Mike Galbraith | 8bb39f9 | 2010-03-26 11:11:33 +0100 | [diff] [blame] | 3881 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3882 | perf_event_header__init_id(&task_event->event_id.header, &sample, event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3883 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3884 | ret = perf_output_begin(&handle, event, |
| 3885 | task_event->event_id.header.size, 0, 0); |
Peter Zijlstra | ef60777 | 2010-05-18 10:50:41 +0200 | [diff] [blame] | 3886 | if (ret) |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3887 | goto out; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3888 | |
| 3889 | task_event->event_id.pid = perf_event_pid(event, task); |
| 3890 | task_event->event_id.ppid = perf_event_pid(event, current); |
| 3891 | |
| 3892 | task_event->event_id.tid = perf_event_tid(event, task); |
| 3893 | task_event->event_id.ptid = perf_event_tid(event, current); |
| 3894 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3895 | perf_output_put(&handle, task_event->event_id); |
| 3896 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3897 | perf_event__output_id_sample(event, &handle, &sample); |
| 3898 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3899 | perf_output_end(&handle); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 3900 | out: |
| 3901 | task_event->event_id.header.size = size; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3902 | } |
| 3903 | |
| 3904 | static int perf_event_task_match(struct perf_event *event) |
| 3905 | { |
Peter Zijlstra | 6f93d0a | 2010-02-14 11:12:04 +0100 | [diff] [blame] | 3906 | if (event->state < PERF_EVENT_STATE_INACTIVE) |
Peter Zijlstra | 22e1908 | 2010-01-18 09:12:32 +0100 | [diff] [blame] | 3907 | return 0; |
| 3908 | |
Stephane Eranian | 5632ab1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 3909 | if (!event_filter_match(event)) |
Peter Zijlstra | 5d27c23 | 2009-12-17 13:16:32 +0100 | [diff] [blame] | 3910 | return 0; |
| 3911 | |
Eric B Munson | 3af9e85 | 2010-05-18 15:30:49 +0100 | [diff] [blame] | 3912 | if (event->attr.comm || event->attr.mmap || |
| 3913 | event->attr.mmap_data || event->attr.task) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3914 | return 1; |
| 3915 | |
| 3916 | return 0; |
| 3917 | } |
| 3918 | |
| 3919 | static void perf_event_task_ctx(struct perf_event_context *ctx, |
| 3920 | struct perf_task_event *task_event) |
| 3921 | { |
| 3922 | struct perf_event *event; |
| 3923 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3924 | list_for_each_entry_rcu(event, &ctx->event_list, event_entry) { |
| 3925 | if (perf_event_task_match(event)) |
| 3926 | perf_event_task_output(event, task_event); |
| 3927 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3928 | } |
| 3929 | |
| 3930 | static void perf_event_task_event(struct perf_task_event *task_event) |
| 3931 | { |
| 3932 | struct perf_cpu_context *cpuctx; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 3933 | struct perf_event_context *ctx; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 3934 | struct pmu *pmu; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 3935 | int ctxn; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3936 | |
Peter Zijlstra | d6ff86c | 2009-11-20 22:19:46 +0100 | [diff] [blame] | 3937 | rcu_read_lock(); |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 3938 | list_for_each_entry_rcu(pmu, &pmus, entry) { |
Peter Zijlstra | 41945f6 | 2010-09-16 19:17:24 +0200 | [diff] [blame] | 3939 | cpuctx = get_cpu_ptr(pmu->pmu_cpu_context); |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 3940 | if (cpuctx->active_pmu != pmu) |
| 3941 | goto next; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 3942 | perf_event_task_ctx(&cpuctx->ctx, task_event); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 3943 | |
| 3944 | ctx = task_event->task_ctx; |
| 3945 | if (!ctx) { |
| 3946 | ctxn = pmu->task_ctx_nr; |
| 3947 | if (ctxn < 0) |
Peter Zijlstra | 41945f6 | 2010-09-16 19:17:24 +0200 | [diff] [blame] | 3948 | goto next; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 3949 | ctx = rcu_dereference(current->perf_event_ctxp[ctxn]); |
| 3950 | } |
| 3951 | if (ctx) |
| 3952 | perf_event_task_ctx(ctx, task_event); |
Peter Zijlstra | 41945f6 | 2010-09-16 19:17:24 +0200 | [diff] [blame] | 3953 | next: |
| 3954 | put_cpu_ptr(pmu->pmu_cpu_context); |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 3955 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3956 | rcu_read_unlock(); |
| 3957 | } |
| 3958 | |
| 3959 | static void perf_event_task(struct task_struct *task, |
| 3960 | struct perf_event_context *task_ctx, |
| 3961 | int new) |
| 3962 | { |
| 3963 | struct perf_task_event task_event; |
| 3964 | |
| 3965 | if (!atomic_read(&nr_comm_events) && |
| 3966 | !atomic_read(&nr_mmap_events) && |
| 3967 | !atomic_read(&nr_task_events)) |
| 3968 | return; |
| 3969 | |
| 3970 | task_event = (struct perf_task_event){ |
| 3971 | .task = task, |
| 3972 | .task_ctx = task_ctx, |
| 3973 | .event_id = { |
| 3974 | .header = { |
| 3975 | .type = new ? PERF_RECORD_FORK : PERF_RECORD_EXIT, |
| 3976 | .misc = 0, |
| 3977 | .size = sizeof(task_event.event_id), |
| 3978 | }, |
| 3979 | /* .pid */ |
| 3980 | /* .ppid */ |
| 3981 | /* .tid */ |
| 3982 | /* .ptid */ |
Peter Zijlstra | 6f93d0a | 2010-02-14 11:12:04 +0100 | [diff] [blame] | 3983 | .time = perf_clock(), |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 3984 | }, |
| 3985 | }; |
| 3986 | |
| 3987 | perf_event_task_event(&task_event); |
| 3988 | } |
| 3989 | |
| 3990 | void perf_event_fork(struct task_struct *task) |
| 3991 | { |
| 3992 | perf_event_task(task, NULL, 1); |
| 3993 | } |
| 3994 | |
| 3995 | /* |
| 3996 | * comm tracking |
| 3997 | */ |
| 3998 | |
| 3999 | struct perf_comm_event { |
| 4000 | struct task_struct *task; |
| 4001 | char *comm; |
| 4002 | int comm_size; |
| 4003 | |
| 4004 | struct { |
| 4005 | struct perf_event_header header; |
| 4006 | |
| 4007 | u32 pid; |
| 4008 | u32 tid; |
| 4009 | } event_id; |
| 4010 | }; |
| 4011 | |
| 4012 | static void perf_event_comm_output(struct perf_event *event, |
| 4013 | struct perf_comm_event *comm_event) |
| 4014 | { |
| 4015 | struct perf_output_handle handle; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 4016 | struct perf_sample_data sample; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4017 | int size = comm_event->event_id.header.size; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 4018 | int ret; |
| 4019 | |
| 4020 | perf_event_header__init_id(&comm_event->event_id.header, &sample, event); |
| 4021 | ret = perf_output_begin(&handle, event, |
| 4022 | comm_event->event_id.header.size, 0, 0); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4023 | |
| 4024 | if (ret) |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 4025 | goto out; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4026 | |
| 4027 | comm_event->event_id.pid = perf_event_pid(event, comm_event->task); |
| 4028 | comm_event->event_id.tid = perf_event_tid(event, comm_event->task); |
| 4029 | |
| 4030 | perf_output_put(&handle, comm_event->event_id); |
| 4031 | perf_output_copy(&handle, comm_event->comm, |
| 4032 | comm_event->comm_size); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 4033 | |
| 4034 | perf_event__output_id_sample(event, &handle, &sample); |
| 4035 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4036 | perf_output_end(&handle); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 4037 | out: |
| 4038 | comm_event->event_id.header.size = size; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4039 | } |
| 4040 | |
| 4041 | static int perf_event_comm_match(struct perf_event *event) |
| 4042 | { |
Peter Zijlstra | 6f93d0a | 2010-02-14 11:12:04 +0100 | [diff] [blame] | 4043 | if (event->state < PERF_EVENT_STATE_INACTIVE) |
Peter Zijlstra | 22e1908 | 2010-01-18 09:12:32 +0100 | [diff] [blame] | 4044 | return 0; |
| 4045 | |
Stephane Eranian | 5632ab1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 4046 | if (!event_filter_match(event)) |
Peter Zijlstra | 5d27c23 | 2009-12-17 13:16:32 +0100 | [diff] [blame] | 4047 | return 0; |
| 4048 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4049 | if (event->attr.comm) |
| 4050 | return 1; |
| 4051 | |
| 4052 | return 0; |
| 4053 | } |
| 4054 | |
| 4055 | static void perf_event_comm_ctx(struct perf_event_context *ctx, |
| 4056 | struct perf_comm_event *comm_event) |
| 4057 | { |
| 4058 | struct perf_event *event; |
| 4059 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4060 | list_for_each_entry_rcu(event, &ctx->event_list, event_entry) { |
| 4061 | if (perf_event_comm_match(event)) |
| 4062 | perf_event_comm_output(event, comm_event); |
| 4063 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4064 | } |
| 4065 | |
| 4066 | static void perf_event_comm_event(struct perf_comm_event *comm_event) |
| 4067 | { |
| 4068 | struct perf_cpu_context *cpuctx; |
| 4069 | struct perf_event_context *ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4070 | char comm[TASK_COMM_LEN]; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4071 | unsigned int size; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 4072 | struct pmu *pmu; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 4073 | int ctxn; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4074 | |
| 4075 | memset(comm, 0, sizeof(comm)); |
Márton Németh | 96b02d7 | 2009-11-21 23:10:15 +0100 | [diff] [blame] | 4076 | strlcpy(comm, comm_event->task->comm, sizeof(comm)); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4077 | size = ALIGN(strlen(comm)+1, sizeof(u64)); |
| 4078 | |
| 4079 | comm_event->comm = comm; |
| 4080 | comm_event->comm_size = size; |
| 4081 | |
| 4082 | comm_event->event_id.header.size = sizeof(comm_event->event_id) + size; |
Peter Zijlstra | f6595f3 | 2009-11-20 22:19:47 +0100 | [diff] [blame] | 4083 | rcu_read_lock(); |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 4084 | list_for_each_entry_rcu(pmu, &pmus, entry) { |
Peter Zijlstra | 41945f6 | 2010-09-16 19:17:24 +0200 | [diff] [blame] | 4085 | cpuctx = get_cpu_ptr(pmu->pmu_cpu_context); |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 4086 | if (cpuctx->active_pmu != pmu) |
| 4087 | goto next; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 4088 | perf_event_comm_ctx(&cpuctx->ctx, comm_event); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 4089 | |
| 4090 | ctxn = pmu->task_ctx_nr; |
| 4091 | if (ctxn < 0) |
Peter Zijlstra | 41945f6 | 2010-09-16 19:17:24 +0200 | [diff] [blame] | 4092 | goto next; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 4093 | |
| 4094 | ctx = rcu_dereference(current->perf_event_ctxp[ctxn]); |
| 4095 | if (ctx) |
| 4096 | perf_event_comm_ctx(ctx, comm_event); |
Peter Zijlstra | 41945f6 | 2010-09-16 19:17:24 +0200 | [diff] [blame] | 4097 | next: |
| 4098 | put_cpu_ptr(pmu->pmu_cpu_context); |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 4099 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4100 | rcu_read_unlock(); |
| 4101 | } |
| 4102 | |
| 4103 | void perf_event_comm(struct task_struct *task) |
| 4104 | { |
| 4105 | struct perf_comm_event comm_event; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 4106 | struct perf_event_context *ctx; |
| 4107 | int ctxn; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4108 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 4109 | for_each_task_context_nr(ctxn) { |
| 4110 | ctx = task->perf_event_ctxp[ctxn]; |
| 4111 | if (!ctx) |
| 4112 | continue; |
| 4113 | |
| 4114 | perf_event_enable_on_exec(ctx); |
| 4115 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4116 | |
| 4117 | if (!atomic_read(&nr_comm_events)) |
| 4118 | return; |
| 4119 | |
| 4120 | comm_event = (struct perf_comm_event){ |
| 4121 | .task = task, |
| 4122 | /* .comm */ |
| 4123 | /* .comm_size */ |
| 4124 | .event_id = { |
| 4125 | .header = { |
| 4126 | .type = PERF_RECORD_COMM, |
| 4127 | .misc = 0, |
| 4128 | /* .size */ |
| 4129 | }, |
| 4130 | /* .pid */ |
| 4131 | /* .tid */ |
| 4132 | }, |
| 4133 | }; |
| 4134 | |
| 4135 | perf_event_comm_event(&comm_event); |
| 4136 | } |
| 4137 | |
| 4138 | /* |
| 4139 | * mmap tracking |
| 4140 | */ |
| 4141 | |
| 4142 | struct perf_mmap_event { |
| 4143 | struct vm_area_struct *vma; |
| 4144 | |
| 4145 | const char *file_name; |
| 4146 | int file_size; |
| 4147 | |
| 4148 | struct { |
| 4149 | struct perf_event_header header; |
| 4150 | |
| 4151 | u32 pid; |
| 4152 | u32 tid; |
| 4153 | u64 start; |
| 4154 | u64 len; |
| 4155 | u64 pgoff; |
| 4156 | } event_id; |
| 4157 | }; |
| 4158 | |
| 4159 | static void perf_event_mmap_output(struct perf_event *event, |
| 4160 | struct perf_mmap_event *mmap_event) |
| 4161 | { |
| 4162 | struct perf_output_handle handle; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 4163 | struct perf_sample_data sample; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4164 | int size = mmap_event->event_id.header.size; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 4165 | int ret; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4166 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 4167 | perf_event_header__init_id(&mmap_event->event_id.header, &sample, event); |
| 4168 | ret = perf_output_begin(&handle, event, |
| 4169 | mmap_event->event_id.header.size, 0, 0); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4170 | if (ret) |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 4171 | goto out; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4172 | |
| 4173 | mmap_event->event_id.pid = perf_event_pid(event, current); |
| 4174 | mmap_event->event_id.tid = perf_event_tid(event, current); |
| 4175 | |
| 4176 | perf_output_put(&handle, mmap_event->event_id); |
| 4177 | perf_output_copy(&handle, mmap_event->file_name, |
| 4178 | mmap_event->file_size); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 4179 | |
| 4180 | perf_event__output_id_sample(event, &handle, &sample); |
| 4181 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4182 | perf_output_end(&handle); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 4183 | out: |
| 4184 | mmap_event->event_id.header.size = size; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4185 | } |
| 4186 | |
| 4187 | static int perf_event_mmap_match(struct perf_event *event, |
Eric B Munson | 3af9e85 | 2010-05-18 15:30:49 +0100 | [diff] [blame] | 4188 | struct perf_mmap_event *mmap_event, |
| 4189 | int executable) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4190 | { |
Peter Zijlstra | 6f93d0a | 2010-02-14 11:12:04 +0100 | [diff] [blame] | 4191 | if (event->state < PERF_EVENT_STATE_INACTIVE) |
Peter Zijlstra | 22e1908 | 2010-01-18 09:12:32 +0100 | [diff] [blame] | 4192 | return 0; |
| 4193 | |
Stephane Eranian | 5632ab1 | 2011-01-03 18:20:01 +0200 | [diff] [blame] | 4194 | if (!event_filter_match(event)) |
Peter Zijlstra | 5d27c23 | 2009-12-17 13:16:32 +0100 | [diff] [blame] | 4195 | return 0; |
| 4196 | |
Eric B Munson | 3af9e85 | 2010-05-18 15:30:49 +0100 | [diff] [blame] | 4197 | if ((!executable && event->attr.mmap_data) || |
| 4198 | (executable && event->attr.mmap)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4199 | return 1; |
| 4200 | |
| 4201 | return 0; |
| 4202 | } |
| 4203 | |
| 4204 | static void perf_event_mmap_ctx(struct perf_event_context *ctx, |
Eric B Munson | 3af9e85 | 2010-05-18 15:30:49 +0100 | [diff] [blame] | 4205 | struct perf_mmap_event *mmap_event, |
| 4206 | int executable) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4207 | { |
| 4208 | struct perf_event *event; |
| 4209 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4210 | list_for_each_entry_rcu(event, &ctx->event_list, event_entry) { |
Eric B Munson | 3af9e85 | 2010-05-18 15:30:49 +0100 | [diff] [blame] | 4211 | if (perf_event_mmap_match(event, mmap_event, executable)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4212 | perf_event_mmap_output(event, mmap_event); |
| 4213 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4214 | } |
| 4215 | |
| 4216 | static void perf_event_mmap_event(struct perf_mmap_event *mmap_event) |
| 4217 | { |
| 4218 | struct perf_cpu_context *cpuctx; |
| 4219 | struct perf_event_context *ctx; |
| 4220 | struct vm_area_struct *vma = mmap_event->vma; |
| 4221 | struct file *file = vma->vm_file; |
| 4222 | unsigned int size; |
| 4223 | char tmp[16]; |
| 4224 | char *buf = NULL; |
| 4225 | const char *name; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 4226 | struct pmu *pmu; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 4227 | int ctxn; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4228 | |
| 4229 | memset(tmp, 0, sizeof(tmp)); |
| 4230 | |
| 4231 | if (file) { |
| 4232 | /* |
| 4233 | * d_path works from the end of the buffer backwards, so we |
| 4234 | * need to add enough zero bytes after the string to handle |
| 4235 | * the 64bit alignment we do later. |
| 4236 | */ |
| 4237 | buf = kzalloc(PATH_MAX + sizeof(u64), GFP_KERNEL); |
| 4238 | if (!buf) { |
| 4239 | name = strncpy(tmp, "//enomem", sizeof(tmp)); |
| 4240 | goto got_name; |
| 4241 | } |
| 4242 | name = d_path(&file->f_path, buf, PATH_MAX); |
| 4243 | if (IS_ERR(name)) { |
| 4244 | name = strncpy(tmp, "//toolong", sizeof(tmp)); |
| 4245 | goto got_name; |
| 4246 | } |
| 4247 | } else { |
| 4248 | if (arch_vma_name(mmap_event->vma)) { |
| 4249 | name = strncpy(tmp, arch_vma_name(mmap_event->vma), |
| 4250 | sizeof(tmp)); |
| 4251 | goto got_name; |
| 4252 | } |
| 4253 | |
| 4254 | if (!vma->vm_mm) { |
| 4255 | name = strncpy(tmp, "[vdso]", sizeof(tmp)); |
| 4256 | goto got_name; |
Eric B Munson | 3af9e85 | 2010-05-18 15:30:49 +0100 | [diff] [blame] | 4257 | } else if (vma->vm_start <= vma->vm_mm->start_brk && |
| 4258 | vma->vm_end >= vma->vm_mm->brk) { |
| 4259 | name = strncpy(tmp, "[heap]", sizeof(tmp)); |
| 4260 | goto got_name; |
| 4261 | } else if (vma->vm_start <= vma->vm_mm->start_stack && |
| 4262 | vma->vm_end >= vma->vm_mm->start_stack) { |
| 4263 | name = strncpy(tmp, "[stack]", sizeof(tmp)); |
| 4264 | goto got_name; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4265 | } |
| 4266 | |
| 4267 | name = strncpy(tmp, "//anon", sizeof(tmp)); |
| 4268 | goto got_name; |
| 4269 | } |
| 4270 | |
| 4271 | got_name: |
| 4272 | size = ALIGN(strlen(name)+1, sizeof(u64)); |
| 4273 | |
| 4274 | mmap_event->file_name = name; |
| 4275 | mmap_event->file_size = size; |
| 4276 | |
| 4277 | mmap_event->event_id.header.size = sizeof(mmap_event->event_id) + size; |
| 4278 | |
Peter Zijlstra | f6d9dd2 | 2009-11-20 22:19:48 +0100 | [diff] [blame] | 4279 | rcu_read_lock(); |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 4280 | list_for_each_entry_rcu(pmu, &pmus, entry) { |
Peter Zijlstra | 41945f6 | 2010-09-16 19:17:24 +0200 | [diff] [blame] | 4281 | cpuctx = get_cpu_ptr(pmu->pmu_cpu_context); |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 4282 | if (cpuctx->active_pmu != pmu) |
| 4283 | goto next; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 4284 | perf_event_mmap_ctx(&cpuctx->ctx, mmap_event, |
| 4285 | vma->vm_flags & VM_EXEC); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 4286 | |
| 4287 | ctxn = pmu->task_ctx_nr; |
| 4288 | if (ctxn < 0) |
Peter Zijlstra | 41945f6 | 2010-09-16 19:17:24 +0200 | [diff] [blame] | 4289 | goto next; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 4290 | |
| 4291 | ctx = rcu_dereference(current->perf_event_ctxp[ctxn]); |
| 4292 | if (ctx) { |
| 4293 | perf_event_mmap_ctx(ctx, mmap_event, |
| 4294 | vma->vm_flags & VM_EXEC); |
| 4295 | } |
Peter Zijlstra | 41945f6 | 2010-09-16 19:17:24 +0200 | [diff] [blame] | 4296 | next: |
| 4297 | put_cpu_ptr(pmu->pmu_cpu_context); |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 4298 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4299 | rcu_read_unlock(); |
| 4300 | |
| 4301 | kfree(buf); |
| 4302 | } |
| 4303 | |
Eric B Munson | 3af9e85 | 2010-05-18 15:30:49 +0100 | [diff] [blame] | 4304 | void perf_event_mmap(struct vm_area_struct *vma) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4305 | { |
| 4306 | struct perf_mmap_event mmap_event; |
| 4307 | |
| 4308 | if (!atomic_read(&nr_mmap_events)) |
| 4309 | return; |
| 4310 | |
| 4311 | mmap_event = (struct perf_mmap_event){ |
| 4312 | .vma = vma, |
| 4313 | /* .file_name */ |
| 4314 | /* .file_size */ |
| 4315 | .event_id = { |
| 4316 | .header = { |
| 4317 | .type = PERF_RECORD_MMAP, |
Zhang, Yanmin | 39447b3 | 2010-04-19 13:32:41 +0800 | [diff] [blame] | 4318 | .misc = PERF_RECORD_MISC_USER, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4319 | /* .size */ |
| 4320 | }, |
| 4321 | /* .pid */ |
| 4322 | /* .tid */ |
| 4323 | .start = vma->vm_start, |
| 4324 | .len = vma->vm_end - vma->vm_start, |
Peter Zijlstra | 3a0304e | 2010-02-26 10:33:41 +0100 | [diff] [blame] | 4325 | .pgoff = (u64)vma->vm_pgoff << PAGE_SHIFT, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4326 | }, |
| 4327 | }; |
| 4328 | |
| 4329 | perf_event_mmap_event(&mmap_event); |
| 4330 | } |
| 4331 | |
| 4332 | /* |
| 4333 | * IRQ throttle logging |
| 4334 | */ |
| 4335 | |
| 4336 | static void perf_log_throttle(struct perf_event *event, int enable) |
| 4337 | { |
| 4338 | struct perf_output_handle handle; |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 4339 | struct perf_sample_data sample; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4340 | int ret; |
| 4341 | |
| 4342 | struct { |
| 4343 | struct perf_event_header header; |
| 4344 | u64 time; |
| 4345 | u64 id; |
| 4346 | u64 stream_id; |
| 4347 | } throttle_event = { |
| 4348 | .header = { |
| 4349 | .type = PERF_RECORD_THROTTLE, |
| 4350 | .misc = 0, |
| 4351 | .size = sizeof(throttle_event), |
| 4352 | }, |
| 4353 | .time = perf_clock(), |
| 4354 | .id = primary_event_id(event), |
| 4355 | .stream_id = event->id, |
| 4356 | }; |
| 4357 | |
| 4358 | if (enable) |
| 4359 | throttle_event.header.type = PERF_RECORD_UNTHROTTLE; |
| 4360 | |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 4361 | perf_event_header__init_id(&throttle_event.header, &sample, event); |
| 4362 | |
| 4363 | ret = perf_output_begin(&handle, event, |
| 4364 | throttle_event.header.size, 1, 0); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4365 | if (ret) |
| 4366 | return; |
| 4367 | |
| 4368 | perf_output_put(&handle, throttle_event); |
Arnaldo Carvalho de Melo | c980d10 | 2010-12-04 23:02:20 -0200 | [diff] [blame] | 4369 | perf_event__output_id_sample(event, &handle, &sample); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4370 | perf_output_end(&handle); |
| 4371 | } |
| 4372 | |
| 4373 | /* |
| 4374 | * Generic event overflow handling, sampling. |
| 4375 | */ |
| 4376 | |
| 4377 | static int __perf_event_overflow(struct perf_event *event, int nmi, |
| 4378 | int throttle, struct perf_sample_data *data, |
| 4379 | struct pt_regs *regs) |
| 4380 | { |
| 4381 | int events = atomic_read(&event->event_limit); |
| 4382 | struct hw_perf_event *hwc = &event->hw; |
| 4383 | int ret = 0; |
| 4384 | |
Peter Zijlstra | 9639882 | 2010-11-24 18:55:29 +0100 | [diff] [blame] | 4385 | /* |
| 4386 | * Non-sampling counters might still use the PMI to fold short |
| 4387 | * hardware counters, ignore those. |
| 4388 | */ |
| 4389 | if (unlikely(!is_sampling_event(event))) |
| 4390 | return 0; |
| 4391 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4392 | if (!throttle) { |
| 4393 | hwc->interrupts++; |
| 4394 | } else { |
| 4395 | if (hwc->interrupts != MAX_INTERRUPTS) { |
| 4396 | hwc->interrupts++; |
| 4397 | if (HZ * hwc->interrupts > |
| 4398 | (u64)sysctl_perf_event_sample_rate) { |
| 4399 | hwc->interrupts = MAX_INTERRUPTS; |
| 4400 | perf_log_throttle(event, 0); |
| 4401 | ret = 1; |
| 4402 | } |
| 4403 | } else { |
| 4404 | /* |
| 4405 | * Keep re-disabling events even though on the previous |
| 4406 | * pass we disabled it - just in case we raced with a |
| 4407 | * sched-in and the event got enabled again: |
| 4408 | */ |
| 4409 | ret = 1; |
| 4410 | } |
| 4411 | } |
| 4412 | |
| 4413 | if (event->attr.freq) { |
| 4414 | u64 now = perf_clock(); |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 4415 | s64 delta = now - hwc->freq_time_stamp; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4416 | |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 4417 | hwc->freq_time_stamp = now; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4418 | |
Peter Zijlstra | abd5071 | 2010-01-26 18:50:16 +0100 | [diff] [blame] | 4419 | if (delta > 0 && delta < 2*TICK_NSEC) |
| 4420 | perf_adjust_period(event, delta, hwc->last_period); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4421 | } |
| 4422 | |
| 4423 | /* |
| 4424 | * XXX event_limit might not quite work as expected on inherited |
| 4425 | * events |
| 4426 | */ |
| 4427 | |
| 4428 | event->pending_kill = POLL_IN; |
| 4429 | if (events && atomic_dec_and_test(&event->event_limit)) { |
| 4430 | ret = 1; |
| 4431 | event->pending_kill = POLL_HUP; |
| 4432 | if (nmi) { |
| 4433 | event->pending_disable = 1; |
Peter Zijlstra | e360adb | 2010-10-14 14:01:34 +0800 | [diff] [blame] | 4434 | irq_work_queue(&event->pending); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4435 | } else |
| 4436 | perf_event_disable(event); |
| 4437 | } |
| 4438 | |
Peter Zijlstra | 453f19e | 2009-11-20 22:19:43 +0100 | [diff] [blame] | 4439 | if (event->overflow_handler) |
| 4440 | event->overflow_handler(event, nmi, data, regs); |
| 4441 | else |
| 4442 | perf_event_output(event, nmi, data, regs); |
| 4443 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4444 | return ret; |
| 4445 | } |
| 4446 | |
| 4447 | int perf_event_overflow(struct perf_event *event, int nmi, |
| 4448 | struct perf_sample_data *data, |
| 4449 | struct pt_regs *regs) |
| 4450 | { |
| 4451 | return __perf_event_overflow(event, nmi, 1, data, regs); |
| 4452 | } |
| 4453 | |
| 4454 | /* |
| 4455 | * Generic software event infrastructure |
| 4456 | */ |
| 4457 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4458 | struct swevent_htable { |
| 4459 | struct swevent_hlist *swevent_hlist; |
| 4460 | struct mutex hlist_mutex; |
| 4461 | int hlist_refcount; |
| 4462 | |
| 4463 | /* Recursion avoidance in each contexts */ |
| 4464 | int recursion[PERF_NR_CONTEXTS]; |
| 4465 | }; |
| 4466 | |
| 4467 | static DEFINE_PER_CPU(struct swevent_htable, swevent_htable); |
| 4468 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4469 | /* |
| 4470 | * We directly increment event->count and keep a second value in |
| 4471 | * event->hw.period_left to count intervals. This period event |
| 4472 | * is kept in the range [-sample_period, 0] so that we can use the |
| 4473 | * sign as trigger. |
| 4474 | */ |
| 4475 | |
| 4476 | static u64 perf_swevent_set_period(struct perf_event *event) |
| 4477 | { |
| 4478 | struct hw_perf_event *hwc = &event->hw; |
| 4479 | u64 period = hwc->last_period; |
| 4480 | u64 nr, offset; |
| 4481 | s64 old, val; |
| 4482 | |
| 4483 | hwc->last_period = hwc->sample_period; |
| 4484 | |
| 4485 | again: |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 4486 | old = val = local64_read(&hwc->period_left); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4487 | if (val < 0) |
| 4488 | return 0; |
| 4489 | |
| 4490 | nr = div64_u64(period + val, period); |
| 4491 | offset = nr * period; |
| 4492 | val -= offset; |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 4493 | if (local64_cmpxchg(&hwc->period_left, old, val) != old) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4494 | goto again; |
| 4495 | |
| 4496 | return nr; |
| 4497 | } |
| 4498 | |
Peter Zijlstra | 0cff784 | 2009-11-20 22:19:44 +0100 | [diff] [blame] | 4499 | static void perf_swevent_overflow(struct perf_event *event, u64 overflow, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4500 | int nmi, struct perf_sample_data *data, |
| 4501 | struct pt_regs *regs) |
| 4502 | { |
| 4503 | struct hw_perf_event *hwc = &event->hw; |
| 4504 | int throttle = 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4505 | |
| 4506 | data->period = event->hw.last_period; |
Peter Zijlstra | 0cff784 | 2009-11-20 22:19:44 +0100 | [diff] [blame] | 4507 | if (!overflow) |
| 4508 | overflow = perf_swevent_set_period(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4509 | |
| 4510 | if (hwc->interrupts == MAX_INTERRUPTS) |
| 4511 | return; |
| 4512 | |
| 4513 | for (; overflow; overflow--) { |
| 4514 | if (__perf_event_overflow(event, nmi, throttle, |
| 4515 | data, regs)) { |
| 4516 | /* |
| 4517 | * We inhibit the overflow from happening when |
| 4518 | * hwc->interrupts == MAX_INTERRUPTS. |
| 4519 | */ |
| 4520 | break; |
| 4521 | } |
| 4522 | throttle = 1; |
| 4523 | } |
| 4524 | } |
| 4525 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 4526 | static void perf_swevent_event(struct perf_event *event, u64 nr, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4527 | int nmi, struct perf_sample_data *data, |
| 4528 | struct pt_regs *regs) |
| 4529 | { |
| 4530 | struct hw_perf_event *hwc = &event->hw; |
| 4531 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 4532 | local64_add(nr, &event->count); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4533 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4534 | if (!regs) |
| 4535 | return; |
| 4536 | |
Franck Bui-Huu | 6c7e550 | 2010-11-23 16:21:43 +0100 | [diff] [blame] | 4537 | if (!is_sampling_event(event)) |
Peter Zijlstra | 0cff784 | 2009-11-20 22:19:44 +0100 | [diff] [blame] | 4538 | return; |
| 4539 | |
| 4540 | if (nr == 1 && hwc->sample_period == 1 && !event->attr.freq) |
| 4541 | return perf_swevent_overflow(event, 1, nmi, data, regs); |
| 4542 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 4543 | if (local64_add_negative(nr, &hwc->period_left)) |
Peter Zijlstra | 0cff784 | 2009-11-20 22:19:44 +0100 | [diff] [blame] | 4544 | return; |
| 4545 | |
| 4546 | perf_swevent_overflow(event, 0, nmi, data, regs); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4547 | } |
| 4548 | |
Frederic Weisbecker | f5ffe02 | 2009-11-23 15:42:34 +0100 | [diff] [blame] | 4549 | static int perf_exclude_event(struct perf_event *event, |
| 4550 | struct pt_regs *regs) |
| 4551 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 4552 | if (event->hw.state & PERF_HES_STOPPED) |
| 4553 | return 0; |
| 4554 | |
Frederic Weisbecker | f5ffe02 | 2009-11-23 15:42:34 +0100 | [diff] [blame] | 4555 | if (regs) { |
| 4556 | if (event->attr.exclude_user && user_mode(regs)) |
| 4557 | return 1; |
| 4558 | |
| 4559 | if (event->attr.exclude_kernel && !user_mode(regs)) |
| 4560 | return 1; |
| 4561 | } |
| 4562 | |
| 4563 | return 0; |
| 4564 | } |
| 4565 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4566 | static int perf_swevent_match(struct perf_event *event, |
| 4567 | enum perf_type_id type, |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 4568 | u32 event_id, |
| 4569 | struct perf_sample_data *data, |
| 4570 | struct pt_regs *regs) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4571 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4572 | if (event->attr.type != type) |
| 4573 | return 0; |
Frederic Weisbecker | f5ffe02 | 2009-11-23 15:42:34 +0100 | [diff] [blame] | 4574 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4575 | if (event->attr.config != event_id) |
| 4576 | return 0; |
| 4577 | |
Frederic Weisbecker | f5ffe02 | 2009-11-23 15:42:34 +0100 | [diff] [blame] | 4578 | if (perf_exclude_event(event, regs)) |
| 4579 | return 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4580 | |
| 4581 | return 1; |
| 4582 | } |
| 4583 | |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4584 | static inline u64 swevent_hash(u64 type, u32 event_id) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4585 | { |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4586 | u64 val = event_id | (type << 32); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4587 | |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4588 | return hash_64(val, SWEVENT_HLIST_BITS); |
| 4589 | } |
| 4590 | |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 4591 | static inline struct hlist_head * |
| 4592 | __find_swevent_head(struct swevent_hlist *hlist, u64 type, u32 event_id) |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4593 | { |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 4594 | u64 hash = swevent_hash(type, event_id); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4595 | |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 4596 | return &hlist->heads[hash]; |
| 4597 | } |
| 4598 | |
| 4599 | /* For the read side: events when they trigger */ |
| 4600 | static inline struct hlist_head * |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4601 | 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] | 4602 | { |
| 4603 | struct swevent_hlist *hlist; |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4604 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4605 | hlist = rcu_dereference(swhash->swevent_hlist); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4606 | if (!hlist) |
| 4607 | return NULL; |
| 4608 | |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 4609 | return __find_swevent_head(hlist, type, event_id); |
| 4610 | } |
| 4611 | |
| 4612 | /* For the event head insertion and removal in the hlist */ |
| 4613 | static inline struct hlist_head * |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4614 | find_swevent_head(struct swevent_htable *swhash, struct perf_event *event) |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 4615 | { |
| 4616 | struct swevent_hlist *hlist; |
| 4617 | u32 event_id = event->attr.config; |
| 4618 | u64 type = event->attr.type; |
| 4619 | |
| 4620 | /* |
| 4621 | * Event scheduling is always serialized against hlist allocation |
| 4622 | * and release. Which makes the protected version suitable here. |
| 4623 | * The context lock guarantees that. |
| 4624 | */ |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4625 | hlist = rcu_dereference_protected(swhash->swevent_hlist, |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 4626 | lockdep_is_held(&event->ctx->lock)); |
| 4627 | if (!hlist) |
| 4628 | return NULL; |
| 4629 | |
| 4630 | return __find_swevent_head(hlist, type, event_id); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4631 | } |
| 4632 | |
| 4633 | static void do_perf_sw_event(enum perf_type_id type, u32 event_id, |
| 4634 | u64 nr, int nmi, |
| 4635 | struct perf_sample_data *data, |
| 4636 | struct pt_regs *regs) |
| 4637 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4638 | struct swevent_htable *swhash = &__get_cpu_var(swevent_htable); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4639 | struct perf_event *event; |
| 4640 | struct hlist_node *node; |
| 4641 | struct hlist_head *head; |
| 4642 | |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4643 | rcu_read_lock(); |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4644 | head = find_swevent_head_rcu(swhash, type, event_id); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4645 | if (!head) |
| 4646 | goto end; |
| 4647 | |
| 4648 | hlist_for_each_entry_rcu(event, node, head, hlist_entry) { |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 4649 | if (perf_swevent_match(event, type, event_id, data, regs)) |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 4650 | perf_swevent_event(event, nr, nmi, data, regs); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4651 | } |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4652 | end: |
| 4653 | rcu_read_unlock(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4654 | } |
| 4655 | |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 4656 | int perf_swevent_get_recursion_context(void) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4657 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4658 | struct swevent_htable *swhash = &__get_cpu_var(swevent_htable); |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 4659 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4660 | return get_recursion_context(swhash->recursion); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4661 | } |
Ingo Molnar | 645e8cc | 2009-11-22 12:20:19 +0100 | [diff] [blame] | 4662 | EXPORT_SYMBOL_GPL(perf_swevent_get_recursion_context); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4663 | |
Peter Zijlstra | ecc55f8 | 2010-05-21 15:11:34 +0200 | [diff] [blame] | 4664 | void inline perf_swevent_put_recursion_context(int rctx) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4665 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4666 | struct swevent_htable *swhash = &__get_cpu_var(swevent_htable); |
Frederic Weisbecker | 927c7a9 | 2010-07-01 16:20:36 +0200 | [diff] [blame] | 4667 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4668 | put_recursion_context(swhash->recursion, rctx); |
Frederic Weisbecker | ce71b9d | 2009-11-22 05:26:55 +0100 | [diff] [blame] | 4669 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4670 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4671 | void __perf_sw_event(u32 event_id, u64 nr, int nmi, |
| 4672 | struct pt_regs *regs, u64 addr) |
| 4673 | { |
Ingo Molnar | a4234bf | 2009-11-23 10:57:59 +0100 | [diff] [blame] | 4674 | struct perf_sample_data data; |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 4675 | int rctx; |
| 4676 | |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 4677 | preempt_disable_notrace(); |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 4678 | rctx = perf_swevent_get_recursion_context(); |
| 4679 | if (rctx < 0) |
| 4680 | return; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4681 | |
Peter Zijlstra | dc1d628 | 2010-03-03 15:55:04 +0100 | [diff] [blame] | 4682 | perf_sample_data_init(&data, addr); |
Ingo Molnar | a4234bf | 2009-11-23 10:57:59 +0100 | [diff] [blame] | 4683 | |
| 4684 | do_perf_sw_event(PERF_TYPE_SOFTWARE, event_id, nr, nmi, &data, regs); |
Peter Zijlstra | 4ed7c92 | 2009-11-23 11:37:29 +0100 | [diff] [blame] | 4685 | |
| 4686 | perf_swevent_put_recursion_context(rctx); |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 4687 | preempt_enable_notrace(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4688 | } |
| 4689 | |
| 4690 | static void perf_swevent_read(struct perf_event *event) |
| 4691 | { |
| 4692 | } |
| 4693 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 4694 | static int perf_swevent_add(struct perf_event *event, int flags) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4695 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4696 | struct swevent_htable *swhash = &__get_cpu_var(swevent_htable); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4697 | struct hw_perf_event *hwc = &event->hw; |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4698 | struct hlist_head *head; |
| 4699 | |
Franck Bui-Huu | 6c7e550 | 2010-11-23 16:21:43 +0100 | [diff] [blame] | 4700 | if (is_sampling_event(event)) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4701 | hwc->last_period = hwc->sample_period; |
| 4702 | perf_swevent_set_period(event); |
| 4703 | } |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4704 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 4705 | hwc->state = !(flags & PERF_EF_START); |
| 4706 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4707 | head = find_swevent_head(swhash, event); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4708 | if (WARN_ON_ONCE(!head)) |
| 4709 | return -EINVAL; |
| 4710 | |
| 4711 | hlist_add_head_rcu(&event->hlist_entry, head); |
| 4712 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4713 | return 0; |
| 4714 | } |
| 4715 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 4716 | static void perf_swevent_del(struct perf_event *event, int flags) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4717 | { |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4718 | hlist_del_rcu(&event->hlist_entry); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4719 | } |
| 4720 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 4721 | static void perf_swevent_start(struct perf_event *event, int flags) |
Peter Zijlstra | c6df8d5 | 2010-06-03 11:21:20 +0200 | [diff] [blame] | 4722 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 4723 | event->hw.state = 0; |
Peter Zijlstra | c6df8d5 | 2010-06-03 11:21:20 +0200 | [diff] [blame] | 4724 | } |
| 4725 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 4726 | static void perf_swevent_stop(struct perf_event *event, int flags) |
Peter Zijlstra | c6df8d5 | 2010-06-03 11:21:20 +0200 | [diff] [blame] | 4727 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 4728 | event->hw.state = PERF_HES_STOPPED; |
Peter Zijlstra | c6df8d5 | 2010-06-03 11:21:20 +0200 | [diff] [blame] | 4729 | } |
| 4730 | |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 4731 | /* Deref the hlist from the update side */ |
| 4732 | static inline struct swevent_hlist * |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4733 | swevent_hlist_deref(struct swevent_htable *swhash) |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 4734 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4735 | return rcu_dereference_protected(swhash->swevent_hlist, |
| 4736 | lockdep_is_held(&swhash->hlist_mutex)); |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 4737 | } |
| 4738 | |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4739 | static void swevent_hlist_release_rcu(struct rcu_head *rcu_head) |
| 4740 | { |
| 4741 | struct swevent_hlist *hlist; |
| 4742 | |
| 4743 | hlist = container_of(rcu_head, struct swevent_hlist, rcu_head); |
| 4744 | kfree(hlist); |
| 4745 | } |
| 4746 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4747 | static void swevent_hlist_release(struct swevent_htable *swhash) |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4748 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4749 | struct swevent_hlist *hlist = swevent_hlist_deref(swhash); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4750 | |
Frederic Weisbecker | 49f135e | 2010-05-20 10:17:46 +0200 | [diff] [blame] | 4751 | if (!hlist) |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4752 | return; |
| 4753 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4754 | rcu_assign_pointer(swhash->swevent_hlist, NULL); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4755 | call_rcu(&hlist->rcu_head, swevent_hlist_release_rcu); |
| 4756 | } |
| 4757 | |
| 4758 | static void swevent_hlist_put_cpu(struct perf_event *event, int cpu) |
| 4759 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4760 | struct swevent_htable *swhash = &per_cpu(swevent_htable, cpu); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4761 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4762 | mutex_lock(&swhash->hlist_mutex); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4763 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4764 | if (!--swhash->hlist_refcount) |
| 4765 | swevent_hlist_release(swhash); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4766 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4767 | mutex_unlock(&swhash->hlist_mutex); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4768 | } |
| 4769 | |
| 4770 | static void swevent_hlist_put(struct perf_event *event) |
| 4771 | { |
| 4772 | int cpu; |
| 4773 | |
| 4774 | if (event->cpu != -1) { |
| 4775 | swevent_hlist_put_cpu(event, event->cpu); |
| 4776 | return; |
| 4777 | } |
| 4778 | |
| 4779 | for_each_possible_cpu(cpu) |
| 4780 | swevent_hlist_put_cpu(event, cpu); |
| 4781 | } |
| 4782 | |
| 4783 | static int swevent_hlist_get_cpu(struct perf_event *event, int cpu) |
| 4784 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4785 | struct swevent_htable *swhash = &per_cpu(swevent_htable, cpu); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4786 | int err = 0; |
| 4787 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4788 | mutex_lock(&swhash->hlist_mutex); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4789 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4790 | if (!swevent_hlist_deref(swhash) && cpu_online(cpu)) { |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4791 | struct swevent_hlist *hlist; |
| 4792 | |
| 4793 | hlist = kzalloc(sizeof(*hlist), GFP_KERNEL); |
| 4794 | if (!hlist) { |
| 4795 | err = -ENOMEM; |
| 4796 | goto exit; |
| 4797 | } |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4798 | rcu_assign_pointer(swhash->swevent_hlist, hlist); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4799 | } |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4800 | swhash->hlist_refcount++; |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 4801 | exit: |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 4802 | mutex_unlock(&swhash->hlist_mutex); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4803 | |
| 4804 | return err; |
| 4805 | } |
| 4806 | |
| 4807 | static int swevent_hlist_get(struct perf_event *event) |
| 4808 | { |
| 4809 | int err; |
| 4810 | int cpu, failed_cpu; |
| 4811 | |
| 4812 | if (event->cpu != -1) |
| 4813 | return swevent_hlist_get_cpu(event, event->cpu); |
| 4814 | |
| 4815 | get_online_cpus(); |
| 4816 | for_each_possible_cpu(cpu) { |
| 4817 | err = swevent_hlist_get_cpu(event, cpu); |
| 4818 | if (err) { |
| 4819 | failed_cpu = cpu; |
| 4820 | goto fail; |
| 4821 | } |
| 4822 | } |
| 4823 | put_online_cpus(); |
| 4824 | |
| 4825 | return 0; |
Peter Zijlstra | 9ed6060 | 2010-06-11 17:36:35 +0200 | [diff] [blame] | 4826 | fail: |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4827 | for_each_possible_cpu(cpu) { |
| 4828 | if (cpu == failed_cpu) |
| 4829 | break; |
| 4830 | swevent_hlist_put_cpu(event, cpu); |
| 4831 | } |
| 4832 | |
| 4833 | put_online_cpus(); |
| 4834 | return err; |
| 4835 | } |
| 4836 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 4837 | atomic_t perf_swevent_enabled[PERF_COUNT_SW_MAX]; |
Frederic Weisbecker | 95476b6 | 2010-04-14 23:42:18 +0200 | [diff] [blame] | 4838 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 4839 | static void sw_perf_event_destroy(struct perf_event *event) |
| 4840 | { |
| 4841 | u64 event_id = event->attr.config; |
| 4842 | |
| 4843 | WARN_ON(event->parent); |
| 4844 | |
Peter Zijlstra | 7e54a5a | 2010-10-14 22:32:45 +0200 | [diff] [blame] | 4845 | jump_label_dec(&perf_swevent_enabled[event_id]); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 4846 | swevent_hlist_put(event); |
| 4847 | } |
| 4848 | |
| 4849 | static int perf_swevent_init(struct perf_event *event) |
| 4850 | { |
| 4851 | int event_id = event->attr.config; |
| 4852 | |
| 4853 | if (event->attr.type != PERF_TYPE_SOFTWARE) |
| 4854 | return -ENOENT; |
| 4855 | |
| 4856 | switch (event_id) { |
| 4857 | case PERF_COUNT_SW_CPU_CLOCK: |
| 4858 | case PERF_COUNT_SW_TASK_CLOCK: |
| 4859 | return -ENOENT; |
| 4860 | |
| 4861 | default: |
| 4862 | break; |
| 4863 | } |
| 4864 | |
Dan Carpenter | ce67783 | 2010-10-24 21:50:42 +0200 | [diff] [blame] | 4865 | if (event_id >= PERF_COUNT_SW_MAX) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 4866 | return -ENOENT; |
| 4867 | |
| 4868 | if (!event->parent) { |
| 4869 | int err; |
| 4870 | |
| 4871 | err = swevent_hlist_get(event); |
| 4872 | if (err) |
| 4873 | return err; |
| 4874 | |
Peter Zijlstra | 7e54a5a | 2010-10-14 22:32:45 +0200 | [diff] [blame] | 4875 | jump_label_inc(&perf_swevent_enabled[event_id]); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 4876 | event->destroy = sw_perf_event_destroy; |
| 4877 | } |
| 4878 | |
| 4879 | return 0; |
| 4880 | } |
| 4881 | |
| 4882 | static struct pmu perf_swevent = { |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 4883 | .task_ctx_nr = perf_sw_context, |
| 4884 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 4885 | .event_init = perf_swevent_init, |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 4886 | .add = perf_swevent_add, |
| 4887 | .del = perf_swevent_del, |
| 4888 | .start = perf_swevent_start, |
| 4889 | .stop = perf_swevent_stop, |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 4890 | .read = perf_swevent_read, |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 4891 | }; |
Frederic Weisbecker | 95476b6 | 2010-04-14 23:42:18 +0200 | [diff] [blame] | 4892 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 4893 | #ifdef CONFIG_EVENT_TRACING |
| 4894 | |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 4895 | static int perf_tp_filter_match(struct perf_event *event, |
Frederic Weisbecker | 95476b6 | 2010-04-14 23:42:18 +0200 | [diff] [blame] | 4896 | struct perf_sample_data *data) |
| 4897 | { |
| 4898 | void *record = data->raw->data; |
| 4899 | |
| 4900 | if (likely(!event->filter) || filter_match_preds(event->filter, record)) |
| 4901 | return 1; |
| 4902 | return 0; |
| 4903 | } |
| 4904 | |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 4905 | static int perf_tp_event_match(struct perf_event *event, |
| 4906 | struct perf_sample_data *data, |
| 4907 | struct pt_regs *regs) |
| 4908 | { |
Peter Zijlstra | 580d607 | 2010-05-20 20:54:31 +0200 | [diff] [blame] | 4909 | /* |
| 4910 | * All tracepoints are from kernel-space. |
| 4911 | */ |
| 4912 | if (event->attr.exclude_kernel) |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 4913 | return 0; |
| 4914 | |
| 4915 | if (!perf_tp_filter_match(event, data)) |
| 4916 | return 0; |
| 4917 | |
| 4918 | return 1; |
| 4919 | } |
| 4920 | |
| 4921 | void perf_tp_event(u64 addr, u64 count, void *record, int entry_size, |
Peter Zijlstra | ecc55f8 | 2010-05-21 15:11:34 +0200 | [diff] [blame] | 4922 | struct pt_regs *regs, struct hlist_head *head, int rctx) |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 4923 | { |
| 4924 | struct perf_sample_data data; |
| 4925 | struct perf_event *event; |
| 4926 | struct hlist_node *node; |
| 4927 | |
| 4928 | struct perf_raw_record raw = { |
| 4929 | .size = entry_size, |
| 4930 | .data = record, |
| 4931 | }; |
| 4932 | |
| 4933 | perf_sample_data_init(&data, addr); |
| 4934 | data.raw = &raw; |
| 4935 | |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 4936 | hlist_for_each_entry_rcu(event, node, head, hlist_entry) { |
| 4937 | if (perf_tp_event_match(event, &data, regs)) |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 4938 | perf_swevent_event(event, count, 1, &data, regs); |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 4939 | } |
Peter Zijlstra | ecc55f8 | 2010-05-21 15:11:34 +0200 | [diff] [blame] | 4940 | |
| 4941 | perf_swevent_put_recursion_context(rctx); |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 4942 | } |
| 4943 | EXPORT_SYMBOL_GPL(perf_tp_event); |
| 4944 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4945 | static void tp_perf_event_destroy(struct perf_event *event) |
| 4946 | { |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 4947 | perf_trace_destroy(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4948 | } |
| 4949 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 4950 | static int perf_tp_event_init(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4951 | { |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 4952 | int err; |
| 4953 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 4954 | if (event->attr.type != PERF_TYPE_TRACEPOINT) |
| 4955 | return -ENOENT; |
| 4956 | |
Peter Zijlstra | 1c024eca | 2010-05-19 14:02:22 +0200 | [diff] [blame] | 4957 | err = perf_trace_init(event); |
| 4958 | if (err) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 4959 | return err; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4960 | |
| 4961 | event->destroy = tp_perf_event_destroy; |
| 4962 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 4963 | return 0; |
| 4964 | } |
| 4965 | |
| 4966 | static struct pmu perf_tracepoint = { |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 4967 | .task_ctx_nr = perf_sw_context, |
| 4968 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 4969 | .event_init = perf_tp_event_init, |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 4970 | .add = perf_trace_add, |
| 4971 | .del = perf_trace_del, |
| 4972 | .start = perf_swevent_start, |
| 4973 | .stop = perf_swevent_stop, |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 4974 | .read = perf_swevent_read, |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 4975 | }; |
| 4976 | |
| 4977 | static inline void perf_tp_register(void) |
| 4978 | { |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 4979 | perf_pmu_register(&perf_tracepoint, "tracepoint", PERF_TYPE_TRACEPOINT); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 4980 | } |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 4981 | |
| 4982 | static int perf_event_set_filter(struct perf_event *event, void __user *arg) |
| 4983 | { |
| 4984 | char *filter_str; |
| 4985 | int ret; |
| 4986 | |
| 4987 | if (event->attr.type != PERF_TYPE_TRACEPOINT) |
| 4988 | return -EINVAL; |
| 4989 | |
| 4990 | filter_str = strndup_user(arg, PAGE_SIZE); |
| 4991 | if (IS_ERR(filter_str)) |
| 4992 | return PTR_ERR(filter_str); |
| 4993 | |
| 4994 | ret = ftrace_profile_set_filter(event, event->attr.config, filter_str); |
| 4995 | |
| 4996 | kfree(filter_str); |
| 4997 | return ret; |
| 4998 | } |
| 4999 | |
| 5000 | static void perf_event_free_filter(struct perf_event *event) |
| 5001 | { |
| 5002 | ftrace_profile_free_filter(event); |
| 5003 | } |
| 5004 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5005 | #else |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 5006 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5007 | static inline void perf_tp_register(void) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5008 | { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5009 | } |
Li Zefan | 6fb2915 | 2009-10-15 11:21:42 +0800 | [diff] [blame] | 5010 | |
| 5011 | static int perf_event_set_filter(struct perf_event *event, void __user *arg) |
| 5012 | { |
| 5013 | return -ENOENT; |
| 5014 | } |
| 5015 | |
| 5016 | static void perf_event_free_filter(struct perf_event *event) |
| 5017 | { |
| 5018 | } |
| 5019 | |
Li Zefan | 07b139c | 2009-12-21 14:27:35 +0800 | [diff] [blame] | 5020 | #endif /* CONFIG_EVENT_TRACING */ |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5021 | |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 5022 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
Frederic Weisbecker | f5ffe02 | 2009-11-23 15:42:34 +0100 | [diff] [blame] | 5023 | void perf_bp_event(struct perf_event *bp, void *data) |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 5024 | { |
Frederic Weisbecker | f5ffe02 | 2009-11-23 15:42:34 +0100 | [diff] [blame] | 5025 | struct perf_sample_data sample; |
| 5026 | struct pt_regs *regs = data; |
| 5027 | |
Peter Zijlstra | dc1d628 | 2010-03-03 15:55:04 +0100 | [diff] [blame] | 5028 | perf_sample_data_init(&sample, bp->attr.bp_addr); |
Frederic Weisbecker | f5ffe02 | 2009-11-23 15:42:34 +0100 | [diff] [blame] | 5029 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 5030 | if (!bp->hw.state && !perf_exclude_event(bp, regs)) |
| 5031 | perf_swevent_event(bp, 1, 1, &sample, regs); |
Frederic Weisbecker | 24f1e32c | 2009-09-09 19:22:48 +0200 | [diff] [blame] | 5032 | } |
| 5033 | #endif |
| 5034 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5035 | /* |
| 5036 | * hrtimer based swevent callback |
| 5037 | */ |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5038 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5039 | static enum hrtimer_restart perf_swevent_hrtimer(struct hrtimer *hrtimer) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5040 | { |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5041 | enum hrtimer_restart ret = HRTIMER_RESTART; |
| 5042 | struct perf_sample_data data; |
| 5043 | struct pt_regs *regs; |
| 5044 | struct perf_event *event; |
| 5045 | u64 period; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5046 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5047 | event = container_of(hrtimer, struct perf_event, hw.hrtimer); |
| 5048 | event->pmu->read(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5049 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5050 | perf_sample_data_init(&data, 0); |
| 5051 | data.period = event->hw.last_period; |
| 5052 | regs = get_irq_regs(); |
| 5053 | |
| 5054 | if (regs && !perf_exclude_event(event, regs)) { |
| 5055 | if (!(event->attr.exclude_idle && current->pid == 0)) |
| 5056 | if (perf_event_overflow(event, 0, &data, regs)) |
| 5057 | ret = HRTIMER_NORESTART; |
| 5058 | } |
| 5059 | |
| 5060 | period = max_t(u64, 10000, event->hw.sample_period); |
| 5061 | hrtimer_forward_now(hrtimer, ns_to_ktime(period)); |
| 5062 | |
| 5063 | return ret; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5064 | } |
| 5065 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5066 | static void perf_swevent_start_hrtimer(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5067 | { |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5068 | struct hw_perf_event *hwc = &event->hw; |
Franck Bui-Huu | 5d508e8 | 2010-11-23 16:21:45 +0100 | [diff] [blame] | 5069 | s64 period; |
| 5070 | |
| 5071 | if (!is_sampling_event(event)) |
| 5072 | return; |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5073 | |
| 5074 | hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| 5075 | hwc->hrtimer.function = perf_swevent_hrtimer; |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5076 | |
Franck Bui-Huu | 5d508e8 | 2010-11-23 16:21:45 +0100 | [diff] [blame] | 5077 | period = local64_read(&hwc->period_left); |
| 5078 | if (period) { |
| 5079 | if (period < 0) |
| 5080 | period = 10000; |
Peter Zijlstra | fa407f3 | 2010-06-24 12:35:12 +0200 | [diff] [blame] | 5081 | |
Franck Bui-Huu | 5d508e8 | 2010-11-23 16:21:45 +0100 | [diff] [blame] | 5082 | local64_set(&hwc->period_left, 0); |
| 5083 | } else { |
| 5084 | period = max_t(u64, 10000, hwc->sample_period); |
| 5085 | } |
| 5086 | __hrtimer_start_range_ns(&hwc->hrtimer, |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5087 | ns_to_ktime(period), 0, |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 5088 | HRTIMER_MODE_REL_PINNED, 0); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5089 | } |
| 5090 | |
| 5091 | static void perf_swevent_cancel_hrtimer(struct perf_event *event) |
| 5092 | { |
| 5093 | struct hw_perf_event *hwc = &event->hw; |
| 5094 | |
Franck Bui-Huu | 6c7e550 | 2010-11-23 16:21:43 +0100 | [diff] [blame] | 5095 | if (is_sampling_event(event)) { |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5096 | ktime_t remaining = hrtimer_get_remaining(&hwc->hrtimer); |
Peter Zijlstra | fa407f3 | 2010-06-24 12:35:12 +0200 | [diff] [blame] | 5097 | local64_set(&hwc->period_left, ktime_to_ns(remaining)); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5098 | |
| 5099 | hrtimer_cancel(&hwc->hrtimer); |
| 5100 | } |
| 5101 | } |
| 5102 | |
| 5103 | /* |
| 5104 | * Software event: cpu wall time clock |
| 5105 | */ |
| 5106 | |
| 5107 | static void cpu_clock_event_update(struct perf_event *event) |
| 5108 | { |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5109 | s64 prev; |
| 5110 | u64 now; |
| 5111 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 5112 | now = local_clock(); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5113 | prev = local64_xchg(&event->hw.prev_count, now); |
| 5114 | local64_add(now - prev, &event->count); |
| 5115 | } |
| 5116 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 5117 | static void cpu_clock_event_start(struct perf_event *event, int flags) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5118 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 5119 | local64_set(&event->hw.prev_count, local_clock()); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5120 | perf_swevent_start_hrtimer(event); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 5121 | } |
| 5122 | |
| 5123 | static void cpu_clock_event_stop(struct perf_event *event, int flags) |
| 5124 | { |
| 5125 | perf_swevent_cancel_hrtimer(event); |
| 5126 | cpu_clock_event_update(event); |
| 5127 | } |
| 5128 | |
| 5129 | static int cpu_clock_event_add(struct perf_event *event, int flags) |
| 5130 | { |
| 5131 | if (flags & PERF_EF_START) |
| 5132 | cpu_clock_event_start(event, flags); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5133 | |
| 5134 | return 0; |
| 5135 | } |
| 5136 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 5137 | static void cpu_clock_event_del(struct perf_event *event, int flags) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5138 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 5139 | cpu_clock_event_stop(event, flags); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5140 | } |
| 5141 | |
| 5142 | static void cpu_clock_event_read(struct perf_event *event) |
| 5143 | { |
| 5144 | cpu_clock_event_update(event); |
| 5145 | } |
| 5146 | |
| 5147 | static int cpu_clock_event_init(struct perf_event *event) |
| 5148 | { |
| 5149 | if (event->attr.type != PERF_TYPE_SOFTWARE) |
| 5150 | return -ENOENT; |
| 5151 | |
| 5152 | if (event->attr.config != PERF_COUNT_SW_CPU_CLOCK) |
| 5153 | return -ENOENT; |
| 5154 | |
| 5155 | return 0; |
| 5156 | } |
| 5157 | |
| 5158 | static struct pmu perf_cpu_clock = { |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 5159 | .task_ctx_nr = perf_sw_context, |
| 5160 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5161 | .event_init = cpu_clock_event_init, |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 5162 | .add = cpu_clock_event_add, |
| 5163 | .del = cpu_clock_event_del, |
| 5164 | .start = cpu_clock_event_start, |
| 5165 | .stop = cpu_clock_event_stop, |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5166 | .read = cpu_clock_event_read, |
| 5167 | }; |
| 5168 | |
| 5169 | /* |
| 5170 | * Software event: task time clock |
| 5171 | */ |
| 5172 | |
| 5173 | static void task_clock_event_update(struct perf_event *event, u64 now) |
| 5174 | { |
| 5175 | u64 prev; |
| 5176 | s64 delta; |
| 5177 | |
| 5178 | prev = local64_xchg(&event->hw.prev_count, now); |
| 5179 | delta = now - prev; |
| 5180 | local64_add(delta, &event->count); |
| 5181 | } |
| 5182 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 5183 | static void task_clock_event_start(struct perf_event *event, int flags) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5184 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 5185 | local64_set(&event->hw.prev_count, event->ctx->time); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5186 | perf_swevent_start_hrtimer(event); |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 5187 | } |
| 5188 | |
| 5189 | static void task_clock_event_stop(struct perf_event *event, int flags) |
| 5190 | { |
| 5191 | perf_swevent_cancel_hrtimer(event); |
| 5192 | task_clock_event_update(event, event->ctx->time); |
| 5193 | } |
| 5194 | |
| 5195 | static int task_clock_event_add(struct perf_event *event, int flags) |
| 5196 | { |
| 5197 | if (flags & PERF_EF_START) |
| 5198 | task_clock_event_start(event, flags); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5199 | |
| 5200 | return 0; |
| 5201 | } |
| 5202 | |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 5203 | static void task_clock_event_del(struct perf_event *event, int flags) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5204 | { |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 5205 | task_clock_event_stop(event, PERF_EF_UPDATE); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5206 | } |
| 5207 | |
| 5208 | static void task_clock_event_read(struct perf_event *event) |
| 5209 | { |
| 5210 | u64 time; |
| 5211 | |
| 5212 | if (!in_nmi()) { |
| 5213 | update_context_time(event->ctx); |
| 5214 | time = event->ctx->time; |
| 5215 | } else { |
| 5216 | u64 now = perf_clock(); |
| 5217 | u64 delta = now - event->ctx->timestamp; |
| 5218 | time = event->ctx->time + delta; |
| 5219 | } |
| 5220 | |
| 5221 | task_clock_event_update(event, time); |
| 5222 | } |
| 5223 | |
| 5224 | static int task_clock_event_init(struct perf_event *event) |
| 5225 | { |
| 5226 | if (event->attr.type != PERF_TYPE_SOFTWARE) |
| 5227 | return -ENOENT; |
| 5228 | |
| 5229 | if (event->attr.config != PERF_COUNT_SW_TASK_CLOCK) |
| 5230 | return -ENOENT; |
| 5231 | |
| 5232 | return 0; |
| 5233 | } |
| 5234 | |
| 5235 | static struct pmu perf_task_clock = { |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 5236 | .task_ctx_nr = perf_sw_context, |
| 5237 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5238 | .event_init = task_clock_event_init, |
Peter Zijlstra | a4eaf7f | 2010-06-16 14:37:10 +0200 | [diff] [blame] | 5239 | .add = task_clock_event_add, |
| 5240 | .del = task_clock_event_del, |
| 5241 | .start = task_clock_event_start, |
| 5242 | .stop = task_clock_event_stop, |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5243 | .read = task_clock_event_read, |
| 5244 | }; |
| 5245 | |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 5246 | static void perf_pmu_nop_void(struct pmu *pmu) |
| 5247 | { |
| 5248 | } |
| 5249 | |
| 5250 | static int perf_pmu_nop_int(struct pmu *pmu) |
| 5251 | { |
| 5252 | return 0; |
| 5253 | } |
| 5254 | |
| 5255 | static void perf_pmu_start_txn(struct pmu *pmu) |
| 5256 | { |
| 5257 | perf_pmu_disable(pmu); |
| 5258 | } |
| 5259 | |
| 5260 | static int perf_pmu_commit_txn(struct pmu *pmu) |
| 5261 | { |
| 5262 | perf_pmu_enable(pmu); |
| 5263 | return 0; |
| 5264 | } |
| 5265 | |
| 5266 | static void perf_pmu_cancel_txn(struct pmu *pmu) |
| 5267 | { |
| 5268 | perf_pmu_enable(pmu); |
| 5269 | } |
| 5270 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 5271 | /* |
| 5272 | * Ensures all contexts with the same task_ctx_nr have the same |
| 5273 | * pmu_cpu_context too. |
| 5274 | */ |
| 5275 | static void *find_pmu_context(int ctxn) |
| 5276 | { |
| 5277 | struct pmu *pmu; |
| 5278 | |
| 5279 | if (ctxn < 0) |
| 5280 | return NULL; |
| 5281 | |
| 5282 | list_for_each_entry(pmu, &pmus, entry) { |
| 5283 | if (pmu->task_ctx_nr == ctxn) |
| 5284 | return pmu->pmu_cpu_context; |
| 5285 | } |
| 5286 | |
| 5287 | return NULL; |
| 5288 | } |
| 5289 | |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 5290 | static void update_pmu_context(struct pmu *pmu, struct pmu *old_pmu) |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 5291 | { |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 5292 | int cpu; |
| 5293 | |
| 5294 | for_each_possible_cpu(cpu) { |
| 5295 | struct perf_cpu_context *cpuctx; |
| 5296 | |
| 5297 | cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu); |
| 5298 | |
| 5299 | if (cpuctx->active_pmu == old_pmu) |
| 5300 | cpuctx->active_pmu = pmu; |
| 5301 | } |
| 5302 | } |
| 5303 | |
| 5304 | static void free_pmu_context(struct pmu *pmu) |
| 5305 | { |
| 5306 | struct pmu *i; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 5307 | |
| 5308 | mutex_lock(&pmus_lock); |
| 5309 | /* |
| 5310 | * Like a real lame refcount. |
| 5311 | */ |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 5312 | list_for_each_entry(i, &pmus, entry) { |
| 5313 | if (i->pmu_cpu_context == pmu->pmu_cpu_context) { |
| 5314 | update_pmu_context(i, pmu); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 5315 | goto out; |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 5316 | } |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 5317 | } |
| 5318 | |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 5319 | free_percpu(pmu->pmu_cpu_context); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 5320 | out: |
| 5321 | mutex_unlock(&pmus_lock); |
| 5322 | } |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 5323 | static struct idr pmu_idr; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 5324 | |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 5325 | static ssize_t |
| 5326 | type_show(struct device *dev, struct device_attribute *attr, char *page) |
| 5327 | { |
| 5328 | struct pmu *pmu = dev_get_drvdata(dev); |
| 5329 | |
| 5330 | return snprintf(page, PAGE_SIZE-1, "%d\n", pmu->type); |
| 5331 | } |
| 5332 | |
| 5333 | static struct device_attribute pmu_dev_attrs[] = { |
| 5334 | __ATTR_RO(type), |
| 5335 | __ATTR_NULL, |
| 5336 | }; |
| 5337 | |
| 5338 | static int pmu_bus_running; |
| 5339 | static struct bus_type pmu_bus = { |
| 5340 | .name = "event_source", |
| 5341 | .dev_attrs = pmu_dev_attrs, |
| 5342 | }; |
| 5343 | |
| 5344 | static void pmu_dev_release(struct device *dev) |
| 5345 | { |
| 5346 | kfree(dev); |
| 5347 | } |
| 5348 | |
| 5349 | static int pmu_dev_alloc(struct pmu *pmu) |
| 5350 | { |
| 5351 | int ret = -ENOMEM; |
| 5352 | |
| 5353 | pmu->dev = kzalloc(sizeof(struct device), GFP_KERNEL); |
| 5354 | if (!pmu->dev) |
| 5355 | goto out; |
| 5356 | |
| 5357 | device_initialize(pmu->dev); |
| 5358 | ret = dev_set_name(pmu->dev, "%s", pmu->name); |
| 5359 | if (ret) |
| 5360 | goto free_dev; |
| 5361 | |
| 5362 | dev_set_drvdata(pmu->dev, pmu); |
| 5363 | pmu->dev->bus = &pmu_bus; |
| 5364 | pmu->dev->release = pmu_dev_release; |
| 5365 | ret = device_add(pmu->dev); |
| 5366 | if (ret) |
| 5367 | goto free_dev; |
| 5368 | |
| 5369 | out: |
| 5370 | return ret; |
| 5371 | |
| 5372 | free_dev: |
| 5373 | put_device(pmu->dev); |
| 5374 | goto out; |
| 5375 | } |
| 5376 | |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 5377 | int perf_pmu_register(struct pmu *pmu, char *name, int type) |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5378 | { |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 5379 | int cpu, ret; |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 5380 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5381 | mutex_lock(&pmus_lock); |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 5382 | ret = -ENOMEM; |
| 5383 | pmu->pmu_disable_count = alloc_percpu(int); |
| 5384 | if (!pmu->pmu_disable_count) |
| 5385 | goto unlock; |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 5386 | |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 5387 | pmu->type = -1; |
| 5388 | if (!name) |
| 5389 | goto skip_type; |
| 5390 | pmu->name = name; |
| 5391 | |
| 5392 | if (type < 0) { |
| 5393 | int err = idr_pre_get(&pmu_idr, GFP_KERNEL); |
| 5394 | if (!err) |
| 5395 | goto free_pdc; |
| 5396 | |
| 5397 | err = idr_get_new_above(&pmu_idr, pmu, PERF_TYPE_MAX, &type); |
| 5398 | if (err) { |
| 5399 | ret = err; |
| 5400 | goto free_pdc; |
| 5401 | } |
| 5402 | } |
| 5403 | pmu->type = type; |
| 5404 | |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 5405 | if (pmu_bus_running) { |
| 5406 | ret = pmu_dev_alloc(pmu); |
| 5407 | if (ret) |
| 5408 | goto free_idr; |
| 5409 | } |
| 5410 | |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 5411 | skip_type: |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 5412 | pmu->pmu_cpu_context = find_pmu_context(pmu->task_ctx_nr); |
| 5413 | if (pmu->pmu_cpu_context) |
| 5414 | goto got_cpu_context; |
| 5415 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 5416 | pmu->pmu_cpu_context = alloc_percpu(struct perf_cpu_context); |
| 5417 | if (!pmu->pmu_cpu_context) |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 5418 | goto free_dev; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 5419 | |
| 5420 | for_each_possible_cpu(cpu) { |
| 5421 | struct perf_cpu_context *cpuctx; |
| 5422 | |
| 5423 | cpuctx = per_cpu_ptr(pmu->pmu_cpu_context, cpu); |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 5424 | __perf_event_init_context(&cpuctx->ctx); |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 5425 | cpuctx->ctx.type = cpu_context; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 5426 | cpuctx->ctx.pmu = pmu; |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 5427 | cpuctx->jiffies_interval = 1; |
| 5428 | INIT_LIST_HEAD(&cpuctx->rotation_list); |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 5429 | cpuctx->active_pmu = pmu; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 5430 | } |
| 5431 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 5432 | got_cpu_context: |
Peter Zijlstra | ad5133b | 2010-06-15 12:22:39 +0200 | [diff] [blame] | 5433 | if (!pmu->start_txn) { |
| 5434 | if (pmu->pmu_enable) { |
| 5435 | /* |
| 5436 | * If we have pmu_enable/pmu_disable calls, install |
| 5437 | * transaction stubs that use that to try and batch |
| 5438 | * hardware accesses. |
| 5439 | */ |
| 5440 | pmu->start_txn = perf_pmu_start_txn; |
| 5441 | pmu->commit_txn = perf_pmu_commit_txn; |
| 5442 | pmu->cancel_txn = perf_pmu_cancel_txn; |
| 5443 | } else { |
| 5444 | pmu->start_txn = perf_pmu_nop_void; |
| 5445 | pmu->commit_txn = perf_pmu_nop_int; |
| 5446 | pmu->cancel_txn = perf_pmu_nop_void; |
| 5447 | } |
| 5448 | } |
| 5449 | |
| 5450 | if (!pmu->pmu_enable) { |
| 5451 | pmu->pmu_enable = perf_pmu_nop_void; |
| 5452 | pmu->pmu_disable = perf_pmu_nop_void; |
| 5453 | } |
| 5454 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5455 | list_add_rcu(&pmu->entry, &pmus); |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 5456 | ret = 0; |
| 5457 | unlock: |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5458 | mutex_unlock(&pmus_lock); |
| 5459 | |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 5460 | return ret; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 5461 | |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 5462 | free_dev: |
| 5463 | device_del(pmu->dev); |
| 5464 | put_device(pmu->dev); |
| 5465 | |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 5466 | free_idr: |
| 5467 | if (pmu->type >= PERF_TYPE_MAX) |
| 5468 | idr_remove(&pmu_idr, pmu->type); |
| 5469 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 5470 | free_pdc: |
| 5471 | free_percpu(pmu->pmu_disable_count); |
| 5472 | goto unlock; |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5473 | } |
| 5474 | |
| 5475 | void perf_pmu_unregister(struct pmu *pmu) |
| 5476 | { |
| 5477 | mutex_lock(&pmus_lock); |
| 5478 | list_del_rcu(&pmu->entry); |
| 5479 | mutex_unlock(&pmus_lock); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5480 | |
| 5481 | /* |
Peter Zijlstra | cde8e88 | 2010-09-13 11:06:55 +0200 | [diff] [blame] | 5482 | * We dereference the pmu list under both SRCU and regular RCU, so |
| 5483 | * synchronize against both of those. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5484 | */ |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5485 | synchronize_srcu(&pmus_srcu); |
Peter Zijlstra | cde8e88 | 2010-09-13 11:06:55 +0200 | [diff] [blame] | 5486 | synchronize_rcu(); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5487 | |
Peter Zijlstra | 33696fc | 2010-06-14 08:49:00 +0200 | [diff] [blame] | 5488 | free_percpu(pmu->pmu_disable_count); |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 5489 | if (pmu->type >= PERF_TYPE_MAX) |
| 5490 | idr_remove(&pmu_idr, pmu->type); |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 5491 | device_del(pmu->dev); |
| 5492 | put_device(pmu->dev); |
Peter Zijlstra | 5167695 | 2010-12-07 14:18:20 +0100 | [diff] [blame] | 5493 | free_pmu_context(pmu); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5494 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5495 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5496 | struct pmu *perf_init_event(struct perf_event *event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5497 | { |
Peter Zijlstra | 51b0fe3 | 2010-06-11 13:35:57 +0200 | [diff] [blame] | 5498 | struct pmu *pmu = NULL; |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5499 | int idx; |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 5500 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5501 | idx = srcu_read_lock(&pmus_srcu); |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 5502 | |
| 5503 | rcu_read_lock(); |
| 5504 | pmu = idr_find(&pmu_idr, event->attr.type); |
| 5505 | rcu_read_unlock(); |
| 5506 | if (pmu) |
| 5507 | goto unlock; |
| 5508 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5509 | list_for_each_entry_rcu(pmu, &pmus, entry) { |
| 5510 | int ret = pmu->event_init(event); |
| 5511 | if (!ret) |
Peter Zijlstra | e5f4d33 | 2010-09-10 17:38:06 +0200 | [diff] [blame] | 5512 | goto unlock; |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 5513 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5514 | if (ret != -ENOENT) { |
| 5515 | pmu = ERR_PTR(ret); |
Peter Zijlstra | e5f4d33 | 2010-09-10 17:38:06 +0200 | [diff] [blame] | 5516 | goto unlock; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5517 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5518 | } |
Peter Zijlstra | e5f4d33 | 2010-09-10 17:38:06 +0200 | [diff] [blame] | 5519 | pmu = ERR_PTR(-ENOENT); |
| 5520 | unlock: |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5521 | srcu_read_unlock(&pmus_srcu, idx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5522 | |
| 5523 | return pmu; |
| 5524 | } |
| 5525 | |
| 5526 | /* |
| 5527 | * Allocate and initialize a event structure |
| 5528 | */ |
| 5529 | static struct perf_event * |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 5530 | perf_event_alloc(struct perf_event_attr *attr, int cpu, |
Peter Zijlstra | d580ff8 | 2010-10-14 17:43:23 +0200 | [diff] [blame] | 5531 | struct task_struct *task, |
| 5532 | struct perf_event *group_leader, |
| 5533 | struct perf_event *parent_event, |
| 5534 | perf_overflow_handler_t overflow_handler) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5535 | { |
Peter Zijlstra | 51b0fe3 | 2010-06-11 13:35:57 +0200 | [diff] [blame] | 5536 | struct pmu *pmu; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5537 | struct perf_event *event; |
| 5538 | struct hw_perf_event *hwc; |
| 5539 | long err; |
| 5540 | |
Oleg Nesterov | 66832eb | 2011-01-18 17:10:32 +0100 | [diff] [blame^] | 5541 | if ((unsigned)cpu >= nr_cpu_ids) { |
| 5542 | if (!task || cpu != -1) |
| 5543 | return ERR_PTR(-EINVAL); |
| 5544 | } |
| 5545 | |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 5546 | event = kzalloc(sizeof(*event), GFP_KERNEL); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5547 | if (!event) |
| 5548 | return ERR_PTR(-ENOMEM); |
| 5549 | |
| 5550 | /* |
| 5551 | * Single events are their own group leaders, with an |
| 5552 | * empty sibling list: |
| 5553 | */ |
| 5554 | if (!group_leader) |
| 5555 | group_leader = event; |
| 5556 | |
| 5557 | mutex_init(&event->child_mutex); |
| 5558 | INIT_LIST_HEAD(&event->child_list); |
| 5559 | |
| 5560 | INIT_LIST_HEAD(&event->group_entry); |
| 5561 | INIT_LIST_HEAD(&event->event_entry); |
| 5562 | INIT_LIST_HEAD(&event->sibling_list); |
| 5563 | init_waitqueue_head(&event->waitq); |
Peter Zijlstra | e360adb | 2010-10-14 14:01:34 +0800 | [diff] [blame] | 5564 | init_irq_work(&event->pending, perf_pending_event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5565 | |
| 5566 | mutex_init(&event->mmap_mutex); |
| 5567 | |
| 5568 | event->cpu = cpu; |
| 5569 | event->attr = *attr; |
| 5570 | event->group_leader = group_leader; |
| 5571 | event->pmu = NULL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5572 | event->oncpu = -1; |
| 5573 | |
| 5574 | event->parent = parent_event; |
| 5575 | |
| 5576 | event->ns = get_pid_ns(current->nsproxy->pid_ns); |
| 5577 | event->id = atomic64_inc_return(&perf_event_id); |
| 5578 | |
| 5579 | event->state = PERF_EVENT_STATE_INACTIVE; |
| 5580 | |
Peter Zijlstra | d580ff8 | 2010-10-14 17:43:23 +0200 | [diff] [blame] | 5581 | if (task) { |
| 5582 | event->attach_state = PERF_ATTACH_TASK; |
| 5583 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
| 5584 | /* |
| 5585 | * hw_breakpoint is a bit difficult here.. |
| 5586 | */ |
| 5587 | if (attr->type == PERF_TYPE_BREAKPOINT) |
| 5588 | event->hw.bp_target = task; |
| 5589 | #endif |
| 5590 | } |
| 5591 | |
Frederic Weisbecker | b326e95 | 2009-12-05 09:44:31 +0100 | [diff] [blame] | 5592 | if (!overflow_handler && parent_event) |
| 5593 | overflow_handler = parent_event->overflow_handler; |
Oleg Nesterov | 66832eb | 2011-01-18 17:10:32 +0100 | [diff] [blame^] | 5594 | |
Frederic Weisbecker | b326e95 | 2009-12-05 09:44:31 +0100 | [diff] [blame] | 5595 | event->overflow_handler = overflow_handler; |
Frederic Weisbecker | 97eaf53 | 2009-10-18 15:33:50 +0200 | [diff] [blame] | 5596 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5597 | if (attr->disabled) |
| 5598 | event->state = PERF_EVENT_STATE_OFF; |
| 5599 | |
| 5600 | pmu = NULL; |
| 5601 | |
| 5602 | hwc = &event->hw; |
| 5603 | hwc->sample_period = attr->sample_period; |
| 5604 | if (attr->freq && attr->sample_freq) |
| 5605 | hwc->sample_period = 1; |
| 5606 | hwc->last_period = hwc->sample_period; |
| 5607 | |
Peter Zijlstra | e785059 | 2010-05-21 14:43:08 +0200 | [diff] [blame] | 5608 | local64_set(&hwc->period_left, hwc->sample_period); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5609 | |
| 5610 | /* |
| 5611 | * we currently do not support PERF_FORMAT_GROUP on inherited events |
| 5612 | */ |
| 5613 | if (attr->inherit && (attr->read_format & PERF_FORMAT_GROUP)) |
| 5614 | goto done; |
| 5615 | |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 5616 | pmu = perf_init_event(event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5617 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5618 | done: |
| 5619 | err = 0; |
| 5620 | if (!pmu) |
| 5621 | err = -EINVAL; |
| 5622 | else if (IS_ERR(pmu)) |
| 5623 | err = PTR_ERR(pmu); |
| 5624 | |
| 5625 | if (err) { |
| 5626 | if (event->ns) |
| 5627 | put_pid_ns(event->ns); |
| 5628 | kfree(event); |
| 5629 | return ERR_PTR(err); |
| 5630 | } |
| 5631 | |
| 5632 | event->pmu = pmu; |
| 5633 | |
| 5634 | if (!event->parent) { |
Peter Zijlstra | 82cd6de | 2010-10-14 17:57:23 +0200 | [diff] [blame] | 5635 | if (event->attach_state & PERF_ATTACH_TASK) |
| 5636 | jump_label_inc(&perf_task_events); |
Eric B Munson | 3af9e85 | 2010-05-18 15:30:49 +0100 | [diff] [blame] | 5637 | if (event->attr.mmap || event->attr.mmap_data) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5638 | atomic_inc(&nr_mmap_events); |
| 5639 | if (event->attr.comm) |
| 5640 | atomic_inc(&nr_comm_events); |
| 5641 | if (event->attr.task) |
| 5642 | atomic_inc(&nr_task_events); |
Frederic Weisbecker | 927c7a9 | 2010-07-01 16:20:36 +0200 | [diff] [blame] | 5643 | if (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN) { |
| 5644 | err = get_callchain_buffers(); |
| 5645 | if (err) { |
| 5646 | free_event(event); |
| 5647 | return ERR_PTR(err); |
| 5648 | } |
| 5649 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5650 | } |
| 5651 | |
| 5652 | return event; |
| 5653 | } |
| 5654 | |
| 5655 | static int perf_copy_attr(struct perf_event_attr __user *uattr, |
| 5656 | struct perf_event_attr *attr) |
| 5657 | { |
| 5658 | u32 size; |
| 5659 | int ret; |
| 5660 | |
| 5661 | if (!access_ok(VERIFY_WRITE, uattr, PERF_ATTR_SIZE_VER0)) |
| 5662 | return -EFAULT; |
| 5663 | |
| 5664 | /* |
| 5665 | * zero the full structure, so that a short copy will be nice. |
| 5666 | */ |
| 5667 | memset(attr, 0, sizeof(*attr)); |
| 5668 | |
| 5669 | ret = get_user(size, &uattr->size); |
| 5670 | if (ret) |
| 5671 | return ret; |
| 5672 | |
| 5673 | if (size > PAGE_SIZE) /* silly large */ |
| 5674 | goto err_size; |
| 5675 | |
| 5676 | if (!size) /* abi compat */ |
| 5677 | size = PERF_ATTR_SIZE_VER0; |
| 5678 | |
| 5679 | if (size < PERF_ATTR_SIZE_VER0) |
| 5680 | goto err_size; |
| 5681 | |
| 5682 | /* |
| 5683 | * If we're handed a bigger struct than we know of, |
| 5684 | * ensure all the unknown bits are 0 - i.e. new |
| 5685 | * user-space does not rely on any kernel feature |
| 5686 | * extensions we dont know about yet. |
| 5687 | */ |
| 5688 | if (size > sizeof(*attr)) { |
| 5689 | unsigned char __user *addr; |
| 5690 | unsigned char __user *end; |
| 5691 | unsigned char val; |
| 5692 | |
| 5693 | addr = (void __user *)uattr + sizeof(*attr); |
| 5694 | end = (void __user *)uattr + size; |
| 5695 | |
| 5696 | for (; addr < end; addr++) { |
| 5697 | ret = get_user(val, addr); |
| 5698 | if (ret) |
| 5699 | return ret; |
| 5700 | if (val) |
| 5701 | goto err_size; |
| 5702 | } |
| 5703 | size = sizeof(*attr); |
| 5704 | } |
| 5705 | |
| 5706 | ret = copy_from_user(attr, uattr, size); |
| 5707 | if (ret) |
| 5708 | return -EFAULT; |
| 5709 | |
| 5710 | /* |
| 5711 | * If the type exists, the corresponding creation will verify |
| 5712 | * the attr->config. |
| 5713 | */ |
| 5714 | if (attr->type >= PERF_TYPE_MAX) |
| 5715 | return -EINVAL; |
| 5716 | |
Mahesh Salgaonkar | cd75764 | 2010-01-30 10:25:18 +0530 | [diff] [blame] | 5717 | if (attr->__reserved_1) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5718 | return -EINVAL; |
| 5719 | |
| 5720 | if (attr->sample_type & ~(PERF_SAMPLE_MAX-1)) |
| 5721 | return -EINVAL; |
| 5722 | |
| 5723 | if (attr->read_format & ~(PERF_FORMAT_MAX-1)) |
| 5724 | return -EINVAL; |
| 5725 | |
| 5726 | out: |
| 5727 | return ret; |
| 5728 | |
| 5729 | err_size: |
| 5730 | put_user(sizeof(*attr), &uattr->size); |
| 5731 | ret = -E2BIG; |
| 5732 | goto out; |
| 5733 | } |
| 5734 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 5735 | static int |
| 5736 | 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] | 5737 | { |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 5738 | struct perf_buffer *buffer = NULL, *old_buffer = NULL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5739 | int ret = -EINVAL; |
| 5740 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 5741 | if (!output_event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5742 | goto set; |
| 5743 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 5744 | /* don't allow circular references */ |
| 5745 | if (event == output_event) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5746 | goto out; |
| 5747 | |
Peter Zijlstra | 0f13930 | 2010-05-20 14:35:15 +0200 | [diff] [blame] | 5748 | /* |
| 5749 | * Don't allow cross-cpu buffers |
| 5750 | */ |
| 5751 | if (output_event->cpu != event->cpu) |
| 5752 | goto out; |
| 5753 | |
| 5754 | /* |
| 5755 | * If its not a per-cpu buffer, it must be the same task. |
| 5756 | */ |
| 5757 | if (output_event->cpu == -1 && output_event->ctx != event->ctx) |
| 5758 | goto out; |
| 5759 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5760 | set: |
| 5761 | mutex_lock(&event->mmap_mutex); |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 5762 | /* Can't redirect output if we've got an active mmap() */ |
| 5763 | if (atomic_read(&event->mmap_count)) |
| 5764 | goto unlock; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5765 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 5766 | if (output_event) { |
| 5767 | /* get the buffer we want to redirect to */ |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 5768 | buffer = perf_buffer_get(output_event); |
| 5769 | if (!buffer) |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 5770 | goto unlock; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5771 | } |
| 5772 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 5773 | old_buffer = event->buffer; |
| 5774 | rcu_assign_pointer(event->buffer, buffer); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5775 | ret = 0; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 5776 | unlock: |
| 5777 | mutex_unlock(&event->mmap_mutex); |
| 5778 | |
Peter Zijlstra | ca5135e | 2010-05-28 19:33:23 +0200 | [diff] [blame] | 5779 | if (old_buffer) |
| 5780 | perf_buffer_put(old_buffer); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5781 | out: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5782 | return ret; |
| 5783 | } |
| 5784 | |
| 5785 | /** |
| 5786 | * sys_perf_event_open - open a performance event, associate it to a task/cpu |
| 5787 | * |
| 5788 | * @attr_uptr: event_id type attributes for monitoring/sampling |
| 5789 | * @pid: target pid |
| 5790 | * @cpu: target cpu |
| 5791 | * @group_fd: group leader event fd |
| 5792 | */ |
| 5793 | SYSCALL_DEFINE5(perf_event_open, |
| 5794 | struct perf_event_attr __user *, attr_uptr, |
| 5795 | pid_t, pid, int, cpu, int, group_fd, unsigned long, flags) |
| 5796 | { |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 5797 | struct perf_event *group_leader = NULL, *output_event = NULL; |
| 5798 | struct perf_event *event, *sibling; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5799 | struct perf_event_attr attr; |
| 5800 | struct perf_event_context *ctx; |
| 5801 | struct file *event_file = NULL; |
| 5802 | struct file *group_file = NULL; |
Matt Helsley | 38a81da | 2010-09-13 13:01:20 -0700 | [diff] [blame] | 5803 | struct task_struct *task = NULL; |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 5804 | struct pmu *pmu; |
Al Viro | ea635c6 | 2010-05-26 17:40:29 -0400 | [diff] [blame] | 5805 | int event_fd; |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 5806 | int move_group = 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5807 | int fput_needed = 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5808 | int err; |
| 5809 | |
| 5810 | /* for future expandability... */ |
| 5811 | if (flags & ~(PERF_FLAG_FD_NO_GROUP | PERF_FLAG_FD_OUTPUT)) |
| 5812 | return -EINVAL; |
| 5813 | |
| 5814 | err = perf_copy_attr(attr_uptr, &attr); |
| 5815 | if (err) |
| 5816 | return err; |
| 5817 | |
| 5818 | if (!attr.exclude_kernel) { |
| 5819 | if (perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN)) |
| 5820 | return -EACCES; |
| 5821 | } |
| 5822 | |
| 5823 | if (attr.freq) { |
| 5824 | if (attr.sample_freq > sysctl_perf_event_sample_rate) |
| 5825 | return -EINVAL; |
| 5826 | } |
| 5827 | |
Al Viro | ea635c6 | 2010-05-26 17:40:29 -0400 | [diff] [blame] | 5828 | event_fd = get_unused_fd_flags(O_RDWR); |
| 5829 | if (event_fd < 0) |
| 5830 | return event_fd; |
| 5831 | |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 5832 | if (group_fd != -1) { |
| 5833 | group_leader = perf_fget_light(group_fd, &fput_needed); |
| 5834 | if (IS_ERR(group_leader)) { |
| 5835 | err = PTR_ERR(group_leader); |
Stephane Eranian | d14b12d | 2010-09-17 11:28:47 +0200 | [diff] [blame] | 5836 | goto err_fd; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 5837 | } |
| 5838 | group_file = group_leader->filp; |
| 5839 | if (flags & PERF_FLAG_FD_OUTPUT) |
| 5840 | output_event = group_leader; |
| 5841 | if (flags & PERF_FLAG_FD_NO_GROUP) |
| 5842 | group_leader = NULL; |
| 5843 | } |
| 5844 | |
Peter Zijlstra | c6be5a5 | 2010-10-14 16:59:46 +0200 | [diff] [blame] | 5845 | if (pid != -1) { |
| 5846 | task = find_lively_task_by_vpid(pid); |
| 5847 | if (IS_ERR(task)) { |
| 5848 | err = PTR_ERR(task); |
| 5849 | goto err_group_fd; |
| 5850 | } |
| 5851 | } |
| 5852 | |
Peter Zijlstra | d580ff8 | 2010-10-14 17:43:23 +0200 | [diff] [blame] | 5853 | event = perf_event_alloc(&attr, cpu, task, group_leader, NULL, NULL); |
Stephane Eranian | d14b12d | 2010-09-17 11:28:47 +0200 | [diff] [blame] | 5854 | if (IS_ERR(event)) { |
| 5855 | err = PTR_ERR(event); |
Peter Zijlstra | c6be5a5 | 2010-10-14 16:59:46 +0200 | [diff] [blame] | 5856 | goto err_task; |
Stephane Eranian | d14b12d | 2010-09-17 11:28:47 +0200 | [diff] [blame] | 5857 | } |
| 5858 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5859 | /* |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 5860 | * Special case software events and allow them to be part of |
| 5861 | * any hardware group. |
| 5862 | */ |
| 5863 | pmu = event->pmu; |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 5864 | |
| 5865 | if (group_leader && |
| 5866 | (is_software_event(event) != is_software_event(group_leader))) { |
| 5867 | if (is_software_event(event)) { |
| 5868 | /* |
| 5869 | * If event and group_leader are not both a software |
| 5870 | * event, and event is, then group leader is not. |
| 5871 | * |
| 5872 | * Allow the addition of software events to !software |
| 5873 | * groups, this is safe because software events never |
| 5874 | * fail to schedule. |
| 5875 | */ |
| 5876 | pmu = group_leader->pmu; |
| 5877 | } else if (is_software_event(group_leader) && |
| 5878 | (group_leader->group_flags & PERF_GROUP_SOFTWARE)) { |
| 5879 | /* |
| 5880 | * In case the group is a pure software group, and we |
| 5881 | * try to add a hardware event, move the whole group to |
| 5882 | * the hardware context. |
| 5883 | */ |
| 5884 | move_group = 1; |
| 5885 | } |
| 5886 | } |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 5887 | |
| 5888 | /* |
| 5889 | * Get the target context (task or percpu): |
| 5890 | */ |
Matt Helsley | 38a81da | 2010-09-13 13:01:20 -0700 | [diff] [blame] | 5891 | ctx = find_get_context(pmu, task, cpu); |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 5892 | if (IS_ERR(ctx)) { |
| 5893 | err = PTR_ERR(ctx); |
Peter Zijlstra | c6be5a5 | 2010-10-14 16:59:46 +0200 | [diff] [blame] | 5894 | goto err_alloc; |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 5895 | } |
| 5896 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5897 | /* |
| 5898 | * Look up the group leader (we will attach this event to it): |
| 5899 | */ |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 5900 | if (group_leader) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5901 | err = -EINVAL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5902 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5903 | /* |
| 5904 | * Do not allow a recursive hierarchy (this new sibling |
| 5905 | * becoming part of another group-sibling): |
| 5906 | */ |
| 5907 | if (group_leader->group_leader != group_leader) |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 5908 | goto err_context; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5909 | /* |
| 5910 | * Do not allow to attach to a group in a different |
| 5911 | * task or CPU context: |
| 5912 | */ |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 5913 | if (move_group) { |
| 5914 | if (group_leader->ctx->type != ctx->type) |
| 5915 | goto err_context; |
| 5916 | } else { |
| 5917 | if (group_leader->ctx != ctx) |
| 5918 | goto err_context; |
| 5919 | } |
| 5920 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5921 | /* |
| 5922 | * Only a group leader can be exclusive or pinned |
| 5923 | */ |
| 5924 | if (attr.exclusive || attr.pinned) |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 5925 | goto err_context; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 5926 | } |
| 5927 | |
| 5928 | if (output_event) { |
| 5929 | err = perf_event_set_output(event, output_event); |
| 5930 | if (err) |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 5931 | goto err_context; |
Peter Zijlstra | ac9721f | 2010-05-27 12:54:41 +0200 | [diff] [blame] | 5932 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5933 | |
Al Viro | ea635c6 | 2010-05-26 17:40:29 -0400 | [diff] [blame] | 5934 | event_file = anon_inode_getfile("[perf_event]", &perf_fops, event, O_RDWR); |
| 5935 | if (IS_ERR(event_file)) { |
| 5936 | err = PTR_ERR(event_file); |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 5937 | goto err_context; |
Al Viro | ea635c6 | 2010-05-26 17:40:29 -0400 | [diff] [blame] | 5938 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5939 | |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 5940 | if (move_group) { |
| 5941 | struct perf_event_context *gctx = group_leader->ctx; |
| 5942 | |
| 5943 | mutex_lock(&gctx->mutex); |
| 5944 | perf_event_remove_from_context(group_leader); |
| 5945 | list_for_each_entry(sibling, &group_leader->sibling_list, |
| 5946 | group_entry) { |
| 5947 | perf_event_remove_from_context(sibling); |
| 5948 | put_ctx(gctx); |
| 5949 | } |
| 5950 | mutex_unlock(&gctx->mutex); |
| 5951 | put_ctx(gctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5952 | } |
| 5953 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5954 | event->filp = event_file; |
| 5955 | WARN_ON_ONCE(ctx->parent_ctx); |
| 5956 | mutex_lock(&ctx->mutex); |
Peter Zijlstra | b04243e | 2010-09-17 11:28:48 +0200 | [diff] [blame] | 5957 | |
| 5958 | if (move_group) { |
| 5959 | perf_install_in_context(ctx, group_leader, cpu); |
| 5960 | get_ctx(ctx); |
| 5961 | list_for_each_entry(sibling, &group_leader->sibling_list, |
| 5962 | group_entry) { |
| 5963 | perf_install_in_context(ctx, sibling, cpu); |
| 5964 | get_ctx(ctx); |
| 5965 | } |
| 5966 | } |
| 5967 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5968 | perf_install_in_context(ctx, event, cpu); |
| 5969 | ++ctx->generation; |
| 5970 | mutex_unlock(&ctx->mutex); |
| 5971 | |
| 5972 | event->owner = current; |
Peter Zijlstra | 8882135 | 2010-11-09 19:01:43 +0100 | [diff] [blame] | 5973 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5974 | mutex_lock(¤t->perf_event_mutex); |
| 5975 | list_add_tail(&event->owner_entry, ¤t->perf_event_list); |
| 5976 | mutex_unlock(¤t->perf_event_mutex); |
| 5977 | |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 5978 | /* |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 5979 | * Precalculate sample_data sizes |
| 5980 | */ |
| 5981 | perf_event__header_size(event); |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 5982 | perf_event__id_header_size(event); |
Arnaldo Carvalho de Melo | c320c7b | 2010-10-20 12:50:11 -0200 | [diff] [blame] | 5983 | |
| 5984 | /* |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 5985 | * Drop the reference on the group_event after placing the |
| 5986 | * new event on the sibling_list. This ensures destruction |
| 5987 | * of the group leader will find the pointer to itself in |
| 5988 | * perf_group_detach(). |
| 5989 | */ |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5990 | fput_light(group_file, fput_needed); |
Al Viro | ea635c6 | 2010-05-26 17:40:29 -0400 | [diff] [blame] | 5991 | fd_install(event_fd, event_file); |
| 5992 | return event_fd; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 5993 | |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 5994 | err_context: |
Al Viro | ea635c6 | 2010-05-26 17:40:29 -0400 | [diff] [blame] | 5995 | put_ctx(ctx); |
Peter Zijlstra | c6be5a5 | 2010-10-14 16:59:46 +0200 | [diff] [blame] | 5996 | err_alloc: |
| 5997 | free_event(event); |
Peter Zijlstra | e7d0bc0 | 2010-10-14 16:54:51 +0200 | [diff] [blame] | 5998 | err_task: |
| 5999 | if (task) |
| 6000 | put_task_struct(task); |
Peter Zijlstra | 89a1e18 | 2010-09-07 17:34:50 +0200 | [diff] [blame] | 6001 | err_group_fd: |
| 6002 | fput_light(group_file, fput_needed); |
Al Viro | ea635c6 | 2010-05-26 17:40:29 -0400 | [diff] [blame] | 6003 | err_fd: |
| 6004 | put_unused_fd(event_fd); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6005 | return err; |
| 6006 | } |
| 6007 | |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 6008 | /** |
| 6009 | * perf_event_create_kernel_counter |
| 6010 | * |
| 6011 | * @attr: attributes of the counter to create |
| 6012 | * @cpu: cpu in which the counter is bound |
Matt Helsley | 38a81da | 2010-09-13 13:01:20 -0700 | [diff] [blame] | 6013 | * @task: task to profile (NULL for percpu) |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 6014 | */ |
| 6015 | struct perf_event * |
| 6016 | perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu, |
Matt Helsley | 38a81da | 2010-09-13 13:01:20 -0700 | [diff] [blame] | 6017 | struct task_struct *task, |
Frederic Weisbecker | b326e95 | 2009-12-05 09:44:31 +0100 | [diff] [blame] | 6018 | perf_overflow_handler_t overflow_handler) |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 6019 | { |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 6020 | struct perf_event_context *ctx; |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 6021 | struct perf_event *event; |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 6022 | int err; |
| 6023 | |
| 6024 | /* |
| 6025 | * Get the target context (task or percpu): |
| 6026 | */ |
| 6027 | |
Peter Zijlstra | d580ff8 | 2010-10-14 17:43:23 +0200 | [diff] [blame] | 6028 | event = perf_event_alloc(attr, cpu, task, NULL, NULL, overflow_handler); |
Frederic Weisbecker | c6567f6 | 2009-11-26 05:35:41 +0100 | [diff] [blame] | 6029 | if (IS_ERR(event)) { |
| 6030 | err = PTR_ERR(event); |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 6031 | goto err; |
| 6032 | } |
| 6033 | |
Matt Helsley | 38a81da | 2010-09-13 13:01:20 -0700 | [diff] [blame] | 6034 | ctx = find_get_context(event->pmu, task, cpu); |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 6035 | if (IS_ERR(ctx)) { |
| 6036 | err = PTR_ERR(ctx); |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 6037 | goto err_free; |
Frederic Weisbecker | c6567f6 | 2009-11-26 05:35:41 +0100 | [diff] [blame] | 6038 | } |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 6039 | |
| 6040 | event->filp = NULL; |
| 6041 | WARN_ON_ONCE(ctx->parent_ctx); |
| 6042 | mutex_lock(&ctx->mutex); |
| 6043 | perf_install_in_context(ctx, event, cpu); |
| 6044 | ++ctx->generation; |
| 6045 | mutex_unlock(&ctx->mutex); |
| 6046 | |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 6047 | return event; |
| 6048 | |
Peter Zijlstra | c3f00c7 | 2010-08-18 14:37:15 +0200 | [diff] [blame] | 6049 | err_free: |
| 6050 | free_event(event); |
| 6051 | err: |
Frederic Weisbecker | c6567f6 | 2009-11-26 05:35:41 +0100 | [diff] [blame] | 6052 | return ERR_PTR(err); |
Arjan van de Ven | fb0459d | 2009-09-25 12:25:56 +0200 | [diff] [blame] | 6053 | } |
| 6054 | EXPORT_SYMBOL_GPL(perf_event_create_kernel_counter); |
| 6055 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6056 | static void sync_child_event(struct perf_event *child_event, |
| 6057 | struct task_struct *child) |
| 6058 | { |
| 6059 | struct perf_event *parent_event = child_event->parent; |
| 6060 | u64 child_val; |
| 6061 | |
| 6062 | if (child_event->attr.inherit_stat) |
| 6063 | perf_event_read_event(child_event, child); |
| 6064 | |
Peter Zijlstra | b5e5879 | 2010-05-21 14:43:12 +0200 | [diff] [blame] | 6065 | child_val = perf_event_count(child_event); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6066 | |
| 6067 | /* |
| 6068 | * Add back the child's count to the parent's count: |
| 6069 | */ |
Peter Zijlstra | a6e6dea | 2010-05-21 14:27:58 +0200 | [diff] [blame] | 6070 | atomic64_add(child_val, &parent_event->child_count); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6071 | atomic64_add(child_event->total_time_enabled, |
| 6072 | &parent_event->child_total_time_enabled); |
| 6073 | atomic64_add(child_event->total_time_running, |
| 6074 | &parent_event->child_total_time_running); |
| 6075 | |
| 6076 | /* |
| 6077 | * Remove this event from the parent's list |
| 6078 | */ |
| 6079 | WARN_ON_ONCE(parent_event->ctx->parent_ctx); |
| 6080 | mutex_lock(&parent_event->child_mutex); |
| 6081 | list_del_init(&child_event->child_list); |
| 6082 | mutex_unlock(&parent_event->child_mutex); |
| 6083 | |
| 6084 | /* |
| 6085 | * Release the parent event, if this was the last |
| 6086 | * reference to it. |
| 6087 | */ |
| 6088 | fput(parent_event->filp); |
| 6089 | } |
| 6090 | |
| 6091 | static void |
| 6092 | __perf_event_exit_task(struct perf_event *child_event, |
| 6093 | struct perf_event_context *child_ctx, |
| 6094 | struct task_struct *child) |
| 6095 | { |
| 6096 | struct perf_event *parent_event; |
| 6097 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6098 | perf_event_remove_from_context(child_event); |
| 6099 | |
| 6100 | parent_event = child_event->parent; |
| 6101 | /* |
| 6102 | * It can happen that parent exits first, and has events |
| 6103 | * that are still around due to the child reference. These |
| 6104 | * events need to be zapped - but otherwise linger. |
| 6105 | */ |
| 6106 | if (parent_event) { |
| 6107 | sync_child_event(child_event, child); |
| 6108 | free_event(child_event); |
| 6109 | } |
| 6110 | } |
| 6111 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6112 | 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] | 6113 | { |
| 6114 | struct perf_event *child_event, *tmp; |
| 6115 | struct perf_event_context *child_ctx; |
| 6116 | unsigned long flags; |
| 6117 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6118 | if (likely(!child->perf_event_ctxp[ctxn])) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6119 | perf_event_task(child, NULL, 0); |
| 6120 | return; |
| 6121 | } |
| 6122 | |
| 6123 | local_irq_save(flags); |
| 6124 | /* |
| 6125 | * We can't reschedule here because interrupts are disabled, |
| 6126 | * and either child is current or it is a task that can't be |
| 6127 | * scheduled, so we are now safe from rescheduling changing |
| 6128 | * our context. |
| 6129 | */ |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6130 | child_ctx = child->perf_event_ctxp[ctxn]; |
Peter Zijlstra | 82cd6de | 2010-10-14 17:57:23 +0200 | [diff] [blame] | 6131 | task_ctx_sched_out(child_ctx, EVENT_ALL); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6132 | |
| 6133 | /* |
| 6134 | * Take the context lock here so that if find_get_context is |
| 6135 | * reading child->perf_event_ctxp, we wait until it has |
| 6136 | * incremented the context's refcount before we do put_ctx below. |
| 6137 | */ |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 6138 | raw_spin_lock(&child_ctx->lock); |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6139 | child->perf_event_ctxp[ctxn] = NULL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6140 | /* |
| 6141 | * If this context is a clone; unclone it so it can't get |
| 6142 | * swapped to another process while we're removing all |
| 6143 | * the events from it. |
| 6144 | */ |
| 6145 | unclone_ctx(child_ctx); |
Peter Zijlstra | 5e942bb | 2009-11-23 11:37:26 +0100 | [diff] [blame] | 6146 | update_context_time(child_ctx); |
Thomas Gleixner | e625cce1 | 2009-11-17 18:02:06 +0100 | [diff] [blame] | 6147 | raw_spin_unlock_irqrestore(&child_ctx->lock, flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6148 | |
| 6149 | /* |
| 6150 | * Report the task dead after unscheduling the events so that we |
| 6151 | * won't get any samples after PERF_RECORD_EXIT. We can however still |
| 6152 | * get a few PERF_RECORD_READ events. |
| 6153 | */ |
| 6154 | perf_event_task(child, child_ctx, 0); |
| 6155 | |
| 6156 | /* |
| 6157 | * We can recurse on the same lock type through: |
| 6158 | * |
| 6159 | * __perf_event_exit_task() |
| 6160 | * sync_child_event() |
| 6161 | * fput(parent_event->filp) |
| 6162 | * perf_release() |
| 6163 | * mutex_lock(&ctx->mutex) |
| 6164 | * |
| 6165 | * But since its the parent context it won't be the same instance. |
| 6166 | */ |
Peter Zijlstra | a0507c8 | 2010-05-06 15:42:53 +0200 | [diff] [blame] | 6167 | mutex_lock(&child_ctx->mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6168 | |
| 6169 | again: |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6170 | list_for_each_entry_safe(child_event, tmp, &child_ctx->pinned_groups, |
| 6171 | group_entry) |
| 6172 | __perf_event_exit_task(child_event, child_ctx, child); |
| 6173 | |
| 6174 | list_for_each_entry_safe(child_event, tmp, &child_ctx->flexible_groups, |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6175 | group_entry) |
| 6176 | __perf_event_exit_task(child_event, child_ctx, child); |
| 6177 | |
| 6178 | /* |
| 6179 | * If the last event was a group event, it will have appended all |
| 6180 | * its siblings to the list, but we obtained 'tmp' before that which |
| 6181 | * will still point to the list head terminating the iteration. |
| 6182 | */ |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6183 | if (!list_empty(&child_ctx->pinned_groups) || |
| 6184 | !list_empty(&child_ctx->flexible_groups)) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6185 | goto again; |
| 6186 | |
| 6187 | mutex_unlock(&child_ctx->mutex); |
| 6188 | |
| 6189 | put_ctx(child_ctx); |
| 6190 | } |
| 6191 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6192 | /* |
| 6193 | * When a child task exits, feed back event values to parent events. |
| 6194 | */ |
| 6195 | void perf_event_exit_task(struct task_struct *child) |
| 6196 | { |
Peter Zijlstra | 8882135 | 2010-11-09 19:01:43 +0100 | [diff] [blame] | 6197 | struct perf_event *event, *tmp; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6198 | int ctxn; |
| 6199 | |
Peter Zijlstra | 8882135 | 2010-11-09 19:01:43 +0100 | [diff] [blame] | 6200 | mutex_lock(&child->perf_event_mutex); |
| 6201 | list_for_each_entry_safe(event, tmp, &child->perf_event_list, |
| 6202 | owner_entry) { |
| 6203 | list_del_init(&event->owner_entry); |
| 6204 | |
| 6205 | /* |
| 6206 | * Ensure the list deletion is visible before we clear |
| 6207 | * the owner, closes a race against perf_release() where |
| 6208 | * we need to serialize on the owner->perf_event_mutex. |
| 6209 | */ |
| 6210 | smp_wmb(); |
| 6211 | event->owner = NULL; |
| 6212 | } |
| 6213 | mutex_unlock(&child->perf_event_mutex); |
| 6214 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6215 | for_each_task_context_nr(ctxn) |
| 6216 | perf_event_exit_task_context(child, ctxn); |
| 6217 | } |
| 6218 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6219 | static void perf_free_event(struct perf_event *event, |
| 6220 | struct perf_event_context *ctx) |
| 6221 | { |
| 6222 | struct perf_event *parent = event->parent; |
| 6223 | |
| 6224 | if (WARN_ON_ONCE(!parent)) |
| 6225 | return; |
| 6226 | |
| 6227 | mutex_lock(&parent->child_mutex); |
| 6228 | list_del_init(&event->child_list); |
| 6229 | mutex_unlock(&parent->child_mutex); |
| 6230 | |
| 6231 | fput(parent->filp); |
| 6232 | |
Peter Zijlstra | 8a49542 | 2010-05-27 15:47:49 +0200 | [diff] [blame] | 6233 | perf_group_detach(event); |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6234 | list_del_event(event, ctx); |
| 6235 | free_event(event); |
| 6236 | } |
| 6237 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6238 | /* |
| 6239 | * free an unexposed, unused context as created by inheritance by |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6240 | * perf_event_init_task below, used by fork() in case of fail. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6241 | */ |
| 6242 | void perf_event_free_task(struct task_struct *task) |
| 6243 | { |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6244 | struct perf_event_context *ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6245 | struct perf_event *event, *tmp; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6246 | int ctxn; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6247 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6248 | for_each_task_context_nr(ctxn) { |
| 6249 | ctx = task->perf_event_ctxp[ctxn]; |
| 6250 | if (!ctx) |
| 6251 | continue; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6252 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6253 | mutex_lock(&ctx->mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6254 | again: |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6255 | list_for_each_entry_safe(event, tmp, &ctx->pinned_groups, |
| 6256 | group_entry) |
| 6257 | perf_free_event(event, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6258 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6259 | list_for_each_entry_safe(event, tmp, &ctx->flexible_groups, |
| 6260 | group_entry) |
| 6261 | perf_free_event(event, ctx); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6262 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6263 | if (!list_empty(&ctx->pinned_groups) || |
| 6264 | !list_empty(&ctx->flexible_groups)) |
| 6265 | goto again; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6266 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6267 | mutex_unlock(&ctx->mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6268 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6269 | put_ctx(ctx); |
| 6270 | } |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6271 | } |
| 6272 | |
Peter Zijlstra | 4e231c7 | 2010-09-09 21:01:59 +0200 | [diff] [blame] | 6273 | void perf_event_delayed_put(struct task_struct *task) |
| 6274 | { |
| 6275 | int ctxn; |
| 6276 | |
| 6277 | for_each_task_context_nr(ctxn) |
| 6278 | WARN_ON_ONCE(task->perf_event_ctxp[ctxn]); |
| 6279 | } |
| 6280 | |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 6281 | /* |
| 6282 | * inherit a event from parent task to child task: |
| 6283 | */ |
| 6284 | static struct perf_event * |
| 6285 | inherit_event(struct perf_event *parent_event, |
| 6286 | struct task_struct *parent, |
| 6287 | struct perf_event_context *parent_ctx, |
| 6288 | struct task_struct *child, |
| 6289 | struct perf_event *group_leader, |
| 6290 | struct perf_event_context *child_ctx) |
| 6291 | { |
| 6292 | struct perf_event *child_event; |
Peter Zijlstra | cee010e | 2010-09-10 12:51:54 +0200 | [diff] [blame] | 6293 | unsigned long flags; |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 6294 | |
| 6295 | /* |
| 6296 | * Instead of creating recursive hierarchies of events, |
| 6297 | * we link inherited events back to the original parent, |
| 6298 | * which has a filp for sure, which we use as the reference |
| 6299 | * count: |
| 6300 | */ |
| 6301 | if (parent_event->parent) |
| 6302 | parent_event = parent_event->parent; |
| 6303 | |
| 6304 | child_event = perf_event_alloc(&parent_event->attr, |
| 6305 | parent_event->cpu, |
Peter Zijlstra | d580ff8 | 2010-10-14 17:43:23 +0200 | [diff] [blame] | 6306 | child, |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 6307 | group_leader, parent_event, |
| 6308 | NULL); |
| 6309 | if (IS_ERR(child_event)) |
| 6310 | return child_event; |
| 6311 | get_ctx(child_ctx); |
| 6312 | |
| 6313 | /* |
| 6314 | * Make the child state follow the state of the parent event, |
| 6315 | * not its attr.disabled bit. We hold the parent's mutex, |
| 6316 | * so we won't race with perf_event_{en, dis}able_family. |
| 6317 | */ |
| 6318 | if (parent_event->state >= PERF_EVENT_STATE_INACTIVE) |
| 6319 | child_event->state = PERF_EVENT_STATE_INACTIVE; |
| 6320 | else |
| 6321 | child_event->state = PERF_EVENT_STATE_OFF; |
| 6322 | |
| 6323 | if (parent_event->attr.freq) { |
| 6324 | u64 sample_period = parent_event->hw.sample_period; |
| 6325 | struct hw_perf_event *hwc = &child_event->hw; |
| 6326 | |
| 6327 | hwc->sample_period = sample_period; |
| 6328 | hwc->last_period = sample_period; |
| 6329 | |
| 6330 | local64_set(&hwc->period_left, sample_period); |
| 6331 | } |
| 6332 | |
| 6333 | child_event->ctx = child_ctx; |
| 6334 | child_event->overflow_handler = parent_event->overflow_handler; |
| 6335 | |
| 6336 | /* |
Thomas Gleixner | 614b678 | 2010-12-03 16:24:32 -0200 | [diff] [blame] | 6337 | * Precalculate sample_data sizes |
| 6338 | */ |
| 6339 | perf_event__header_size(child_event); |
Arnaldo Carvalho de Melo | 6844c09 | 2010-12-03 16:36:35 -0200 | [diff] [blame] | 6340 | perf_event__id_header_size(child_event); |
Thomas Gleixner | 614b678 | 2010-12-03 16:24:32 -0200 | [diff] [blame] | 6341 | |
| 6342 | /* |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 6343 | * Link it up in the child's context: |
| 6344 | */ |
Peter Zijlstra | cee010e | 2010-09-10 12:51:54 +0200 | [diff] [blame] | 6345 | raw_spin_lock_irqsave(&child_ctx->lock, flags); |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 6346 | add_event_to_ctx(child_event, child_ctx); |
Peter Zijlstra | cee010e | 2010-09-10 12:51:54 +0200 | [diff] [blame] | 6347 | raw_spin_unlock_irqrestore(&child_ctx->lock, flags); |
Peter Zijlstra | 97dee4f | 2010-09-07 15:35:33 +0200 | [diff] [blame] | 6348 | |
| 6349 | /* |
| 6350 | * Get a reference to the parent filp - we will fput it |
| 6351 | * when the child event exits. This is safe to do because |
| 6352 | * we are in the parent and we know that the filp still |
| 6353 | * exists and has a nonzero count: |
| 6354 | */ |
| 6355 | atomic_long_inc(&parent_event->filp->f_count); |
| 6356 | |
| 6357 | /* |
| 6358 | * Link this into the parent event's child list |
| 6359 | */ |
| 6360 | WARN_ON_ONCE(parent_event->ctx->parent_ctx); |
| 6361 | mutex_lock(&parent_event->child_mutex); |
| 6362 | list_add_tail(&child_event->child_list, &parent_event->child_list); |
| 6363 | mutex_unlock(&parent_event->child_mutex); |
| 6364 | |
| 6365 | return child_event; |
| 6366 | } |
| 6367 | |
| 6368 | static int inherit_group(struct perf_event *parent_event, |
| 6369 | struct task_struct *parent, |
| 6370 | struct perf_event_context *parent_ctx, |
| 6371 | struct task_struct *child, |
| 6372 | struct perf_event_context *child_ctx) |
| 6373 | { |
| 6374 | struct perf_event *leader; |
| 6375 | struct perf_event *sub; |
| 6376 | struct perf_event *child_ctr; |
| 6377 | |
| 6378 | leader = inherit_event(parent_event, parent, parent_ctx, |
| 6379 | child, NULL, child_ctx); |
| 6380 | if (IS_ERR(leader)) |
| 6381 | return PTR_ERR(leader); |
| 6382 | list_for_each_entry(sub, &parent_event->sibling_list, group_entry) { |
| 6383 | child_ctr = inherit_event(sub, parent, parent_ctx, |
| 6384 | child, leader, child_ctx); |
| 6385 | if (IS_ERR(child_ctr)) |
| 6386 | return PTR_ERR(child_ctr); |
| 6387 | } |
| 6388 | return 0; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6389 | } |
| 6390 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6391 | static int |
| 6392 | inherit_task_group(struct perf_event *event, struct task_struct *parent, |
| 6393 | struct perf_event_context *parent_ctx, |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6394 | struct task_struct *child, int ctxn, |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6395 | int *inherited_all) |
| 6396 | { |
| 6397 | int ret; |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6398 | struct perf_event_context *child_ctx; |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6399 | |
| 6400 | if (!event->attr.inherit) { |
| 6401 | *inherited_all = 0; |
| 6402 | return 0; |
| 6403 | } |
| 6404 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6405 | child_ctx = child->perf_event_ctxp[ctxn]; |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6406 | if (!child_ctx) { |
| 6407 | /* |
| 6408 | * This is executed from the parent task context, so |
| 6409 | * inherit events that have been marked for cloning. |
| 6410 | * First allocate and initialize a context for the |
| 6411 | * child. |
| 6412 | */ |
| 6413 | |
Peter Zijlstra | eb18447 | 2010-09-07 15:55:13 +0200 | [diff] [blame] | 6414 | child_ctx = alloc_perf_context(event->pmu, child); |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6415 | if (!child_ctx) |
| 6416 | return -ENOMEM; |
| 6417 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6418 | child->perf_event_ctxp[ctxn] = child_ctx; |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6419 | } |
| 6420 | |
| 6421 | ret = inherit_group(event, parent, parent_ctx, |
| 6422 | child, child_ctx); |
| 6423 | |
| 6424 | if (ret) |
| 6425 | *inherited_all = 0; |
| 6426 | |
| 6427 | return ret; |
| 6428 | } |
| 6429 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6430 | /* |
| 6431 | * Initialize the perf_event context in task_struct |
| 6432 | */ |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6433 | int perf_event_init_context(struct task_struct *child, int ctxn) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6434 | { |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6435 | struct perf_event_context *child_ctx, *parent_ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6436 | struct perf_event_context *cloned_ctx; |
| 6437 | struct perf_event *event; |
| 6438 | struct task_struct *parent = current; |
| 6439 | int inherited_all = 1; |
Thomas Gleixner | dddd337 | 2010-11-24 10:05:55 +0100 | [diff] [blame] | 6440 | unsigned long flags; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6441 | int ret = 0; |
| 6442 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6443 | child->perf_event_ctxp[ctxn] = NULL; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6444 | |
| 6445 | mutex_init(&child->perf_event_mutex); |
| 6446 | INIT_LIST_HEAD(&child->perf_event_list); |
| 6447 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6448 | if (likely(!parent->perf_event_ctxp[ctxn])) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6449 | return 0; |
| 6450 | |
| 6451 | /* |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6452 | * If the parent's context is a clone, pin it so it won't get |
| 6453 | * swapped under us. |
| 6454 | */ |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6455 | parent_ctx = perf_pin_task_context(parent, ctxn); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6456 | |
| 6457 | /* |
| 6458 | * No need to check if parent_ctx != NULL here; since we saw |
| 6459 | * it non-NULL earlier, the only reason for it to become NULL |
| 6460 | * is if we exit, and since we're currently in the middle of |
| 6461 | * a fork we can't be exiting at the same time. |
| 6462 | */ |
| 6463 | |
| 6464 | /* |
| 6465 | * Lock the parent list. No need to lock the child - not PID |
| 6466 | * hashed yet and not running, so nobody can access it. |
| 6467 | */ |
| 6468 | mutex_lock(&parent_ctx->mutex); |
| 6469 | |
| 6470 | /* |
| 6471 | * We dont have to disable NMIs - we are only looking at |
| 6472 | * the list, not manipulating it: |
| 6473 | */ |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6474 | list_for_each_entry(event, &parent_ctx->pinned_groups, group_entry) { |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6475 | ret = inherit_task_group(event, parent, parent_ctx, |
| 6476 | child, ctxn, &inherited_all); |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6477 | if (ret) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6478 | break; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6479 | } |
| 6480 | |
Thomas Gleixner | dddd337 | 2010-11-24 10:05:55 +0100 | [diff] [blame] | 6481 | /* |
| 6482 | * We can't hold ctx->lock when iterating the ->flexible_group list due |
| 6483 | * to allocations, but we need to prevent rotation because |
| 6484 | * rotate_ctx() will change the list from interrupt context. |
| 6485 | */ |
| 6486 | raw_spin_lock_irqsave(&parent_ctx->lock, flags); |
| 6487 | parent_ctx->rotate_disable = 1; |
| 6488 | raw_spin_unlock_irqrestore(&parent_ctx->lock, flags); |
| 6489 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6490 | list_for_each_entry(event, &parent_ctx->flexible_groups, group_entry) { |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6491 | ret = inherit_task_group(event, parent, parent_ctx, |
| 6492 | child, ctxn, &inherited_all); |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6493 | if (ret) |
| 6494 | break; |
| 6495 | } |
| 6496 | |
Thomas Gleixner | dddd337 | 2010-11-24 10:05:55 +0100 | [diff] [blame] | 6497 | raw_spin_lock_irqsave(&parent_ctx->lock, flags); |
| 6498 | parent_ctx->rotate_disable = 0; |
Thomas Gleixner | dddd337 | 2010-11-24 10:05:55 +0100 | [diff] [blame] | 6499 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6500 | child_ctx = child->perf_event_ctxp[ctxn]; |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6501 | |
Peter Zijlstra | 05cbaa2 | 2009-12-30 16:00:35 +0100 | [diff] [blame] | 6502 | if (child_ctx && inherited_all) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6503 | /* |
| 6504 | * Mark the child context as a clone of the parent |
| 6505 | * context, or of whatever the parent is a clone of. |
Peter Zijlstra | c5ed514 | 2011-01-17 13:45:37 +0100 | [diff] [blame] | 6506 | * |
| 6507 | * Note that if the parent is a clone, the holding of |
| 6508 | * parent_ctx->lock avoids it from being uncloned. |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6509 | */ |
Peter Zijlstra | c5ed514 | 2011-01-17 13:45:37 +0100 | [diff] [blame] | 6510 | cloned_ctx = parent_ctx->parent_ctx; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6511 | if (cloned_ctx) { |
| 6512 | child_ctx->parent_ctx = cloned_ctx; |
| 6513 | child_ctx->parent_gen = parent_ctx->parent_gen; |
| 6514 | } else { |
| 6515 | child_ctx->parent_ctx = parent_ctx; |
| 6516 | child_ctx->parent_gen = parent_ctx->generation; |
| 6517 | } |
| 6518 | get_ctx(child_ctx->parent_ctx); |
| 6519 | } |
| 6520 | |
Peter Zijlstra | c5ed514 | 2011-01-17 13:45:37 +0100 | [diff] [blame] | 6521 | raw_spin_unlock_irqrestore(&parent_ctx->lock, flags); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6522 | mutex_unlock(&parent_ctx->mutex); |
| 6523 | |
| 6524 | perf_unpin_context(parent_ctx); |
| 6525 | |
| 6526 | return ret; |
| 6527 | } |
| 6528 | |
Peter Zijlstra | 8dc85d5 | 2010-09-02 16:50:03 +0200 | [diff] [blame] | 6529 | /* |
| 6530 | * Initialize the perf_event context in task_struct |
| 6531 | */ |
| 6532 | int perf_event_init_task(struct task_struct *child) |
| 6533 | { |
| 6534 | int ctxn, ret; |
| 6535 | |
| 6536 | for_each_task_context_nr(ctxn) { |
| 6537 | ret = perf_event_init_context(child, ctxn); |
| 6538 | if (ret) |
| 6539 | return ret; |
| 6540 | } |
| 6541 | |
| 6542 | return 0; |
| 6543 | } |
| 6544 | |
Paul Mackerras | 220b140 | 2010-03-10 20:45:52 +1100 | [diff] [blame] | 6545 | static void __init perf_event_init_all_cpus(void) |
| 6546 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6547 | struct swevent_htable *swhash; |
Paul Mackerras | 220b140 | 2010-03-10 20:45:52 +1100 | [diff] [blame] | 6548 | int cpu; |
Paul Mackerras | 220b140 | 2010-03-10 20:45:52 +1100 | [diff] [blame] | 6549 | |
| 6550 | for_each_possible_cpu(cpu) { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6551 | swhash = &per_cpu(swevent_htable, cpu); |
| 6552 | mutex_init(&swhash->hlist_mutex); |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 6553 | INIT_LIST_HEAD(&per_cpu(rotation_list, cpu)); |
Paul Mackerras | 220b140 | 2010-03-10 20:45:52 +1100 | [diff] [blame] | 6554 | } |
| 6555 | } |
| 6556 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6557 | static void __cpuinit perf_event_init_cpu(int cpu) |
| 6558 | { |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 6559 | struct swevent_htable *swhash = &per_cpu(swevent_htable, cpu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6560 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6561 | mutex_lock(&swhash->hlist_mutex); |
| 6562 | if (swhash->hlist_refcount > 0) { |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6563 | struct swevent_hlist *hlist; |
| 6564 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6565 | hlist = kzalloc_node(sizeof(*hlist), GFP_KERNEL, cpu_to_node(cpu)); |
| 6566 | WARN_ON(!hlist); |
| 6567 | rcu_assign_pointer(swhash->swevent_hlist, hlist); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6568 | } |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6569 | mutex_unlock(&swhash->hlist_mutex); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6570 | } |
| 6571 | |
Peter Zijlstra | c277443 | 2010-12-08 15:29:02 +0100 | [diff] [blame] | 6572 | #if defined CONFIG_HOTPLUG_CPU || defined CONFIG_KEXEC |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 6573 | static void perf_pmu_rotate_stop(struct pmu *pmu) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6574 | { |
Peter Zijlstra | e9d2b06 | 2010-09-17 11:28:50 +0200 | [diff] [blame] | 6575 | struct perf_cpu_context *cpuctx = this_cpu_ptr(pmu->pmu_cpu_context); |
| 6576 | |
| 6577 | WARN_ON(!irqs_disabled()); |
| 6578 | |
| 6579 | list_del_init(&cpuctx->rotation_list); |
| 6580 | } |
| 6581 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 6582 | static void __perf_event_exit_context(void *__info) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6583 | { |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 6584 | struct perf_event_context *ctx = __info; |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6585 | struct perf_event *event, *tmp; |
| 6586 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 6587 | perf_pmu_rotate_stop(ctx->pmu); |
Peter Zijlstra | b5ab4cd | 2010-09-06 16:32:21 +0200 | [diff] [blame] | 6588 | |
Frederic Weisbecker | 889ff01 | 2010-01-09 20:04:47 +0100 | [diff] [blame] | 6589 | list_for_each_entry_safe(event, tmp, &ctx->pinned_groups, group_entry) |
| 6590 | __perf_event_remove_from_context(event); |
| 6591 | list_for_each_entry_safe(event, tmp, &ctx->flexible_groups, group_entry) |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6592 | __perf_event_remove_from_context(event); |
| 6593 | } |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 6594 | |
| 6595 | static void perf_event_exit_cpu_context(int cpu) |
| 6596 | { |
| 6597 | struct perf_event_context *ctx; |
| 6598 | struct pmu *pmu; |
| 6599 | int idx; |
| 6600 | |
| 6601 | idx = srcu_read_lock(&pmus_srcu); |
| 6602 | list_for_each_entry_rcu(pmu, &pmus, entry) { |
Peter Zijlstra | 917bdd1 | 2010-09-17 11:28:49 +0200 | [diff] [blame] | 6603 | ctx = &per_cpu_ptr(pmu->pmu_cpu_context, cpu)->ctx; |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 6604 | |
| 6605 | mutex_lock(&ctx->mutex); |
| 6606 | smp_call_function_single(cpu, __perf_event_exit_context, ctx, 1); |
| 6607 | mutex_unlock(&ctx->mutex); |
| 6608 | } |
| 6609 | srcu_read_unlock(&pmus_srcu, idx); |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 6610 | } |
| 6611 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6612 | static void perf_event_exit_cpu(int cpu) |
| 6613 | { |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6614 | struct swevent_htable *swhash = &per_cpu(swevent_htable, cpu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6615 | |
Peter Zijlstra | b28ab83 | 2010-09-06 14:48:15 +0200 | [diff] [blame] | 6616 | mutex_lock(&swhash->hlist_mutex); |
| 6617 | swevent_hlist_release(swhash); |
| 6618 | mutex_unlock(&swhash->hlist_mutex); |
Frederic Weisbecker | 76e1d90 | 2010-04-05 15:35:57 +0200 | [diff] [blame] | 6619 | |
Peter Zijlstra | 108b02c | 2010-09-06 14:32:03 +0200 | [diff] [blame] | 6620 | perf_event_exit_cpu_context(cpu); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6621 | } |
| 6622 | #else |
| 6623 | static inline void perf_event_exit_cpu(int cpu) { } |
| 6624 | #endif |
| 6625 | |
Peter Zijlstra | c277443 | 2010-12-08 15:29:02 +0100 | [diff] [blame] | 6626 | static int |
| 6627 | perf_reboot(struct notifier_block *notifier, unsigned long val, void *v) |
| 6628 | { |
| 6629 | int cpu; |
| 6630 | |
| 6631 | for_each_online_cpu(cpu) |
| 6632 | perf_event_exit_cpu(cpu); |
| 6633 | |
| 6634 | return NOTIFY_OK; |
| 6635 | } |
| 6636 | |
| 6637 | /* |
| 6638 | * Run the perf reboot notifier at the very last possible moment so that |
| 6639 | * the generic watchdog code runs as long as possible. |
| 6640 | */ |
| 6641 | static struct notifier_block perf_reboot_notifier = { |
| 6642 | .notifier_call = perf_reboot, |
| 6643 | .priority = INT_MIN, |
| 6644 | }; |
| 6645 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6646 | static int __cpuinit |
| 6647 | perf_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu) |
| 6648 | { |
| 6649 | unsigned int cpu = (long)hcpu; |
| 6650 | |
Peter Zijlstra | 5e11637 | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6651 | switch (action & ~CPU_TASKS_FROZEN) { |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6652 | |
| 6653 | case CPU_UP_PREPARE: |
Peter Zijlstra | 5e11637 | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6654 | case CPU_DOWN_FAILED: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6655 | perf_event_init_cpu(cpu); |
| 6656 | break; |
| 6657 | |
Peter Zijlstra | 5e11637 | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6658 | case CPU_UP_CANCELED: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6659 | case CPU_DOWN_PREPARE: |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6660 | perf_event_exit_cpu(cpu); |
| 6661 | break; |
| 6662 | |
| 6663 | default: |
| 6664 | break; |
| 6665 | } |
| 6666 | |
| 6667 | return NOTIFY_OK; |
| 6668 | } |
| 6669 | |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6670 | void __init perf_event_init(void) |
| 6671 | { |
Jason Wessel | 3c502e7 | 2010-11-04 17:33:01 -0500 | [diff] [blame] | 6672 | int ret; |
| 6673 | |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 6674 | idr_init(&pmu_idr); |
| 6675 | |
Paul Mackerras | 220b140 | 2010-03-10 20:45:52 +1100 | [diff] [blame] | 6676 | perf_event_init_all_cpus(); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6677 | init_srcu_struct(&pmus_srcu); |
Peter Zijlstra | 2e80a82 | 2010-11-17 23:17:36 +0100 | [diff] [blame] | 6678 | perf_pmu_register(&perf_swevent, "software", PERF_TYPE_SOFTWARE); |
| 6679 | perf_pmu_register(&perf_cpu_clock, NULL, -1); |
| 6680 | perf_pmu_register(&perf_task_clock, NULL, -1); |
Peter Zijlstra | b0a873e | 2010-06-11 13:35:08 +0200 | [diff] [blame] | 6681 | perf_tp_register(); |
| 6682 | perf_cpu_notifier(perf_cpu_notify); |
Peter Zijlstra | c277443 | 2010-12-08 15:29:02 +0100 | [diff] [blame] | 6683 | register_reboot_notifier(&perf_reboot_notifier); |
Jason Wessel | 3c502e7 | 2010-11-04 17:33:01 -0500 | [diff] [blame] | 6684 | |
| 6685 | ret = init_hw_breakpoint(); |
| 6686 | WARN(ret, "hw_breakpoint initialization failed with: %d", ret); |
Ingo Molnar | cdd6c48 | 2009-09-21 12:02:48 +0200 | [diff] [blame] | 6687 | } |
Peter Zijlstra | abe4340 | 2010-11-17 23:17:37 +0100 | [diff] [blame] | 6688 | |
| 6689 | static int __init perf_event_sysfs_init(void) |
| 6690 | { |
| 6691 | struct pmu *pmu; |
| 6692 | int ret; |
| 6693 | |
| 6694 | mutex_lock(&pmus_lock); |
| 6695 | |
| 6696 | ret = bus_register(&pmu_bus); |
| 6697 | if (ret) |
| 6698 | goto unlock; |
| 6699 | |
| 6700 | list_for_each_entry(pmu, &pmus, entry) { |
| 6701 | if (!pmu->name || pmu->type < 0) |
| 6702 | continue; |
| 6703 | |
| 6704 | ret = pmu_dev_alloc(pmu); |
| 6705 | WARN(ret, "Failed to register pmu: %s, reason %d\n", pmu->name, ret); |
| 6706 | } |
| 6707 | pmu_bus_running = 1; |
| 6708 | ret = 0; |
| 6709 | |
| 6710 | unlock: |
| 6711 | mutex_unlock(&pmus_lock); |
| 6712 | |
| 6713 | return ret; |
| 6714 | } |
| 6715 | device_initcall(perf_event_sysfs_init); |