Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1 | /* |
| 2 | * ring buffer based function tracer |
| 3 | * |
| 4 | * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> |
| 5 | * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> |
| 6 | * |
| 7 | * Originally taken from the RT patch by: |
| 8 | * Arnaldo Carvalho de Melo <acme@redhat.com> |
| 9 | * |
| 10 | * Based on code from the latency_tracer, that is: |
| 11 | * Copyright (C) 2004-2006 Ingo Molnar |
| 12 | * Copyright (C) 2004 William Lee Irwin III |
| 13 | */ |
| 14 | #include <linux/utsrelease.h> |
| 15 | #include <linux/kallsyms.h> |
| 16 | #include <linux/seq_file.h> |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 17 | #include <linux/notifier.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 18 | #include <linux/debugfs.h> |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 19 | #include <linux/pagemap.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 20 | #include <linux/hardirq.h> |
| 21 | #include <linux/linkage.h> |
| 22 | #include <linux/uaccess.h> |
| 23 | #include <linux/ftrace.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/percpu.h> |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 26 | #include <linux/kdebug.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 27 | #include <linux/ctype.h> |
| 28 | #include <linux/init.h> |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 29 | #include <linux/poll.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 30 | #include <linux/gfp.h> |
| 31 | #include <linux/fs.h> |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 32 | #include <linux/kprobes.h> |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 33 | #include <linux/writeback.h> |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 34 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 35 | #include <linux/stacktrace.h> |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 36 | #include <linux/ring_buffer.h> |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 37 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 38 | #include "trace.h" |
| 39 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 40 | #define TRACE_BUFFER_FLAGS (RB_FL_OVERWRITE) |
| 41 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 42 | unsigned long __read_mostly tracing_max_latency = (cycle_t)ULONG_MAX; |
| 43 | unsigned long __read_mostly tracing_thresh; |
| 44 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 45 | static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled); |
| 46 | |
| 47 | static inline void ftrace_disable_cpu(void) |
| 48 | { |
| 49 | preempt_disable(); |
| 50 | local_inc(&__get_cpu_var(ftrace_cpu_disabled)); |
| 51 | } |
| 52 | |
| 53 | static inline void ftrace_enable_cpu(void) |
| 54 | { |
| 55 | local_dec(&__get_cpu_var(ftrace_cpu_disabled)); |
| 56 | preempt_enable(); |
| 57 | } |
| 58 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 59 | static cpumask_t __read_mostly tracing_buffer_mask; |
| 60 | |
| 61 | #define for_each_tracing_cpu(cpu) \ |
| 62 | for_each_cpu_mask(cpu, tracing_buffer_mask) |
| 63 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 64 | static int tracing_disabled = 1; |
| 65 | |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 66 | long |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 67 | ns2usecs(cycle_t nsec) |
| 68 | { |
| 69 | nsec += 500; |
| 70 | do_div(nsec, 1000); |
| 71 | return nsec; |
| 72 | } |
| 73 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 74 | cycle_t ftrace_now(int cpu) |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 75 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 76 | u64 ts = ring_buffer_time_stamp(cpu); |
| 77 | ring_buffer_normalize_time_stamp(cpu, &ts); |
| 78 | return ts; |
Ingo Molnar | 750ed1a | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 79 | } |
| 80 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 81 | /* |
| 82 | * The global_trace is the descriptor that holds the tracing |
| 83 | * buffers for the live tracing. For each CPU, it contains |
| 84 | * a link list of pages that will store trace entries. The |
| 85 | * page descriptor of the pages in the memory is used to hold |
| 86 | * the link list by linking the lru item in the page descriptor |
| 87 | * to each of the pages in the buffer per CPU. |
| 88 | * |
| 89 | * For each active CPU there is a data field that holds the |
| 90 | * pages for the buffer for that CPU. Each CPU has the same number |
| 91 | * of pages allocated for its buffer. |
| 92 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 93 | static struct trace_array global_trace; |
| 94 | |
| 95 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); |
| 96 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 97 | /* |
| 98 | * The max_tr is used to snapshot the global_trace when a maximum |
| 99 | * latency is reached. Some tracers will use this to store a maximum |
| 100 | * trace while it continues examining live traces. |
| 101 | * |
| 102 | * The buffers for the max_tr are set up the same as the global_trace. |
| 103 | * When a snapshot is taken, the link list of the max_tr is swapped |
| 104 | * with the link list of the global_trace and the buffers are reset for |
| 105 | * the global_trace so the tracing can continue. |
| 106 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 107 | static struct trace_array max_tr; |
| 108 | |
| 109 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); |
| 110 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 111 | /* tracer_enabled is used to toggle activation of a tracer */ |
Steven Rostedt | 26994ea | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 112 | static int tracer_enabled = 1; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 113 | |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 114 | /* function tracing enabled */ |
| 115 | int ftrace_function_enabled; |
| 116 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 117 | /* |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 118 | * trace_buf_size is the size in bytes that is allocated |
| 119 | * for a buffer. Note, the number of bytes is always rounded |
| 120 | * to page size. |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 121 | * |
| 122 | * This number is purposely set to a low number of 16384. |
| 123 | * If the dump on oops happens, it will be much appreciated |
| 124 | * to not have to wait for all that output. Anyway this can be |
| 125 | * boot time and run time configurable. |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 126 | */ |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 127 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 128 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 129 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 130 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 131 | /* trace_types holds a link list of available tracers. */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 132 | static struct tracer *trace_types __read_mostly; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 133 | |
| 134 | /* current_trace points to the tracer that is currently active */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 135 | static struct tracer *current_trace __read_mostly; |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 136 | |
| 137 | /* |
| 138 | * max_tracer_type_len is used to simplify the allocating of |
| 139 | * buffers to read userspace tracer names. We keep track of |
| 140 | * the longest tracer name registered. |
| 141 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 142 | static int max_tracer_type_len; |
| 143 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 144 | /* |
| 145 | * trace_types_lock is used to protect the trace_types list. |
| 146 | * This lock is also used to keep user access serialized. |
| 147 | * Accesses from userspace will grab this lock while userspace |
| 148 | * activities happen inside the kernel. |
| 149 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 150 | static DEFINE_MUTEX(trace_types_lock); |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 151 | |
| 152 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 153 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
| 154 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 155 | /* trace_flags holds iter_ctrl options */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 156 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT; |
| 157 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 158 | /** |
| 159 | * trace_wake_up - wake up tasks waiting for trace input |
| 160 | * |
| 161 | * Simply wakes up any task that is blocked on the trace_wait |
| 162 | * queue. These is used with trace_poll for tasks polling the trace. |
| 163 | */ |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 164 | void trace_wake_up(void) |
| 165 | { |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 166 | /* |
| 167 | * The runqueue_is_locked() can fail, but this is the best we |
| 168 | * have for now: |
| 169 | */ |
| 170 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) |
Ingo Molnar | 4e65551 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 171 | wake_up(&trace_wait); |
| 172 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 173 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 174 | static int __init set_buf_size(char *str) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 175 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 176 | unsigned long buf_size; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 177 | int ret; |
| 178 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 179 | if (!str) |
| 180 | return 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 181 | ret = strict_strtoul(str, 0, &buf_size); |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 182 | /* nr_entries can not be zero */ |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 183 | if (ret < 0 || buf_size == 0) |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 184 | return 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 185 | trace_buf_size = buf_size; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 186 | return 1; |
| 187 | } |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 188 | __setup("trace_buf_size=", set_buf_size); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 189 | |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 190 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
| 191 | { |
| 192 | return nsecs / 1000; |
| 193 | } |
| 194 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 195 | /* |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 196 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that |
| 197 | * control the output of kernel symbols. |
| 198 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 199 | #define TRACE_ITER_SYM_MASK \ |
| 200 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR) |
| 201 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 202 | /* These must match the bit postions in trace_iterator_flags */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 203 | static const char *trace_options[] = { |
| 204 | "print-parent", |
| 205 | "sym-offset", |
| 206 | "sym-addr", |
| 207 | "verbose", |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 208 | "raw", |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 209 | "hex", |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 210 | "bin", |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 211 | "block", |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 212 | "stacktrace", |
Ingo Molnar | 4ac3ba4 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 213 | "sched-tree", |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 214 | "ftrace_printk", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 215 | NULL |
| 216 | }; |
| 217 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 218 | /* |
| 219 | * ftrace_max_lock is used to protect the swapping of buffers |
| 220 | * when taking a max snapshot. The buffers themselves are |
| 221 | * protected by per_cpu spinlocks. But the action of the swap |
| 222 | * needs its own lock. |
| 223 | * |
| 224 | * This is defined as a raw_spinlock_t in order to help |
| 225 | * with performance when lockdep debugging is enabled. |
| 226 | */ |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 227 | static raw_spinlock_t ftrace_max_lock = |
| 228 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 229 | |
| 230 | /* |
| 231 | * Copy the new maximum trace into the separate maximum-trace |
| 232 | * structure. (this way the maximum trace is permanently saved, |
| 233 | * for later retrieval via /debugfs/tracing/latency_trace) |
| 234 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 235 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 236 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 237 | { |
| 238 | struct trace_array_cpu *data = tr->data[cpu]; |
| 239 | |
| 240 | max_tr.cpu = cpu; |
| 241 | max_tr.time_start = data->preempt_timestamp; |
| 242 | |
| 243 | data = max_tr.data[cpu]; |
| 244 | data->saved_latency = tracing_max_latency; |
| 245 | |
| 246 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); |
| 247 | data->pid = tsk->pid; |
| 248 | data->uid = tsk->uid; |
| 249 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
| 250 | data->policy = tsk->policy; |
| 251 | data->rt_priority = tsk->rt_priority; |
| 252 | |
| 253 | /* record this tasks comm */ |
| 254 | tracing_record_cmdline(current); |
| 255 | } |
| 256 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 257 | /** |
| 258 | * trace_seq_printf - sequence printing of trace information |
| 259 | * @s: trace sequence descriptor |
| 260 | * @fmt: printf format string |
| 261 | * |
| 262 | * The tracer may use either sequence operations or its own |
| 263 | * copy to user routines. To simplify formating of a trace |
| 264 | * trace_seq_printf is used to store strings into a special |
| 265 | * buffer (@s). Then the output may be either used by |
| 266 | * the sequencer or pulled into another buffer. |
| 267 | */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 268 | int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 269 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) |
| 270 | { |
| 271 | int len = (PAGE_SIZE - 1) - s->len; |
| 272 | va_list ap; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 273 | int ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 274 | |
| 275 | if (!len) |
| 276 | return 0; |
| 277 | |
| 278 | va_start(ap, fmt); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 279 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 280 | va_end(ap); |
| 281 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 282 | /* If we can't write it all, don't bother writing anything */ |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 283 | if (ret >= len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 284 | return 0; |
| 285 | |
| 286 | s->len += ret; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 287 | |
| 288 | return len; |
| 289 | } |
| 290 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 291 | /** |
| 292 | * trace_seq_puts - trace sequence printing of simple string |
| 293 | * @s: trace sequence descriptor |
| 294 | * @str: simple string to record |
| 295 | * |
| 296 | * The tracer may use either the sequence operations or its own |
| 297 | * copy to user routines. This function records a simple string |
| 298 | * into a special buffer (@s) for later retrieval by a sequencer |
| 299 | * or other mechanism. |
| 300 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 301 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 302 | trace_seq_puts(struct trace_seq *s, const char *str) |
| 303 | { |
| 304 | int len = strlen(str); |
| 305 | |
| 306 | if (len > ((PAGE_SIZE - 1) - s->len)) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 307 | return 0; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 308 | |
| 309 | memcpy(s->buffer + s->len, str, len); |
| 310 | s->len += len; |
| 311 | |
| 312 | return len; |
| 313 | } |
| 314 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 315 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 316 | trace_seq_putc(struct trace_seq *s, unsigned char c) |
| 317 | { |
| 318 | if (s->len >= (PAGE_SIZE - 1)) |
| 319 | return 0; |
| 320 | |
| 321 | s->buffer[s->len++] = c; |
| 322 | |
| 323 | return 1; |
| 324 | } |
| 325 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 326 | static int |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 327 | trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) |
| 328 | { |
| 329 | if (len > ((PAGE_SIZE - 1) - s->len)) |
| 330 | return 0; |
| 331 | |
| 332 | memcpy(s->buffer + s->len, mem, len); |
| 333 | s->len += len; |
| 334 | |
| 335 | return len; |
| 336 | } |
| 337 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 338 | #define HEX_CHARS 17 |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 339 | static const char hex2asc[] = "0123456789abcdef"; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 340 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 341 | static int |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 342 | trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) |
| 343 | { |
| 344 | unsigned char hex[HEX_CHARS]; |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 345 | unsigned char *data = mem; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 346 | unsigned char byte; |
| 347 | int i, j; |
| 348 | |
| 349 | BUG_ON(len >= HEX_CHARS); |
| 350 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 351 | #ifdef __BIG_ENDIAN |
| 352 | for (i = 0, j = 0; i < len; i++) { |
| 353 | #else |
| 354 | for (i = len-1, j = 0; i >= 0; i--) { |
| 355 | #endif |
| 356 | byte = data[i]; |
| 357 | |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 358 | hex[j++] = hex2asc[byte & 0x0f]; |
| 359 | hex[j++] = hex2asc[byte >> 4]; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 360 | } |
Thomas Gleixner | 93dcc6e | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 361 | hex[j++] = ' '; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 362 | |
| 363 | return trace_seq_putmem(s, hex, j); |
| 364 | } |
| 365 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 366 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 367 | trace_seq_reset(struct trace_seq *s) |
| 368 | { |
| 369 | s->len = 0; |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 370 | s->readpos = 0; |
| 371 | } |
| 372 | |
| 373 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) |
| 374 | { |
| 375 | int len; |
| 376 | int ret; |
| 377 | |
| 378 | if (s->len <= s->readpos) |
| 379 | return -EBUSY; |
| 380 | |
| 381 | len = s->len - s->readpos; |
| 382 | if (cnt > len) |
| 383 | cnt = len; |
| 384 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); |
| 385 | if (ret) |
| 386 | return -EFAULT; |
| 387 | |
| 388 | s->readpos += len; |
| 389 | return cnt; |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 390 | } |
| 391 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 392 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 393 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
| 394 | { |
| 395 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; |
| 396 | |
| 397 | s->buffer[len] = 0; |
| 398 | seq_puts(m, s->buffer); |
| 399 | |
| 400 | trace_seq_reset(s); |
| 401 | } |
| 402 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 403 | /** |
| 404 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr |
| 405 | * @tr: tracer |
| 406 | * @tsk: the task with the latency |
| 407 | * @cpu: The cpu that initiated the trace. |
| 408 | * |
| 409 | * Flip the buffers between the @tr and the max_tr and record information |
| 410 | * about which task was the cause of this latency. |
| 411 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 412 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 413 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 414 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 415 | struct ring_buffer *buf = tr->buffer; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 416 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 417 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 418 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 419 | |
| 420 | tr->buffer = max_tr.buffer; |
| 421 | max_tr.buffer = buf; |
| 422 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 423 | ftrace_disable_cpu(); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 424 | ring_buffer_reset(tr->buffer); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 425 | ftrace_enable_cpu(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 426 | |
| 427 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 428 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 429 | } |
| 430 | |
| 431 | /** |
| 432 | * update_max_tr_single - only copy one trace over, and reset the rest |
| 433 | * @tr - tracer |
| 434 | * @tsk - task with the latency |
| 435 | * @cpu - the cpu of the buffer to copy. |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 436 | * |
| 437 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 438 | */ |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 439 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 440 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
| 441 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 442 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 443 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 444 | WARN_ON_ONCE(!irqs_disabled()); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 445 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 446 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 447 | ftrace_disable_cpu(); |
| 448 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 449 | ring_buffer_reset(max_tr.buffer); |
| 450 | ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); |
| 451 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 452 | ftrace_enable_cpu(); |
| 453 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 454 | WARN_ON_ONCE(ret); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 455 | |
| 456 | __update_max_tr(tr, tsk, cpu); |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 457 | __raw_spin_unlock(&ftrace_max_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 458 | } |
| 459 | |
Steven Rostedt | 4fcdae8 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 460 | /** |
| 461 | * register_tracer - register a tracer with the ftrace system. |
| 462 | * @type - the plugin for the tracer |
| 463 | * |
| 464 | * Register a new plugin tracer. |
| 465 | */ |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 466 | int register_tracer(struct tracer *type) |
| 467 | { |
| 468 | struct tracer *t; |
| 469 | int len; |
| 470 | int ret = 0; |
| 471 | |
| 472 | if (!type->name) { |
| 473 | pr_info("Tracer must have a name\n"); |
| 474 | return -1; |
| 475 | } |
| 476 | |
| 477 | mutex_lock(&trace_types_lock); |
| 478 | for (t = trace_types; t; t = t->next) { |
| 479 | if (strcmp(type->name, t->name) == 0) { |
| 480 | /* already found */ |
| 481 | pr_info("Trace %s already registered\n", |
| 482 | type->name); |
| 483 | ret = -1; |
| 484 | goto out; |
| 485 | } |
| 486 | } |
| 487 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 488 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
| 489 | if (type->selftest) { |
| 490 | struct tracer *saved_tracer = current_trace; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 491 | struct trace_array *tr = &global_trace; |
| 492 | int saved_ctrl = tr->ctrl; |
| 493 | int i; |
| 494 | /* |
| 495 | * Run a selftest on this tracer. |
| 496 | * Here we reset the trace buffer, and set the current |
| 497 | * tracer to be this tracer. The tracer can then run some |
| 498 | * internal tracing to verify that everything is in order. |
| 499 | * If we fail, we do not register this tracer. |
| 500 | */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 501 | for_each_tracing_cpu(i) { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 502 | tracing_reset(tr, i); |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 503 | } |
| 504 | current_trace = type; |
| 505 | tr->ctrl = 0; |
| 506 | /* the test is responsible for initializing and enabling */ |
| 507 | pr_info("Testing tracer %s: ", type->name); |
| 508 | ret = type->selftest(type, tr); |
| 509 | /* the test is responsible for resetting too */ |
| 510 | current_trace = saved_tracer; |
| 511 | tr->ctrl = saved_ctrl; |
| 512 | if (ret) { |
| 513 | printk(KERN_CONT "FAILED!\n"); |
| 514 | goto out; |
| 515 | } |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 516 | /* Only reset on passing, to avoid touching corrupted buffers */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 517 | for_each_tracing_cpu(i) { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 518 | tracing_reset(tr, i); |
Steven Rostedt | 1d4db00 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 519 | } |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 520 | printk(KERN_CONT "PASSED\n"); |
| 521 | } |
| 522 | #endif |
| 523 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 524 | type->next = trace_types; |
| 525 | trace_types = type; |
| 526 | len = strlen(type->name); |
| 527 | if (len > max_tracer_type_len) |
| 528 | max_tracer_type_len = len; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 529 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 530 | out: |
| 531 | mutex_unlock(&trace_types_lock); |
| 532 | |
| 533 | return ret; |
| 534 | } |
| 535 | |
| 536 | void unregister_tracer(struct tracer *type) |
| 537 | { |
| 538 | struct tracer **t; |
| 539 | int len; |
| 540 | |
| 541 | mutex_lock(&trace_types_lock); |
| 542 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 543 | if (*t == type) |
| 544 | goto found; |
| 545 | } |
| 546 | pr_info("Trace %s not registered\n", type->name); |
| 547 | goto out; |
| 548 | |
| 549 | found: |
| 550 | *t = (*t)->next; |
| 551 | if (strlen(type->name) != max_tracer_type_len) |
| 552 | goto out; |
| 553 | |
| 554 | max_tracer_type_len = 0; |
| 555 | for (t = &trace_types; *t; t = &(*t)->next) { |
| 556 | len = strlen((*t)->name); |
| 557 | if (len > max_tracer_type_len) |
| 558 | max_tracer_type_len = len; |
| 559 | } |
| 560 | out: |
| 561 | mutex_unlock(&trace_types_lock); |
| 562 | } |
| 563 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 564 | void tracing_reset(struct trace_array *tr, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 565 | { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 566 | ftrace_disable_cpu(); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 567 | ring_buffer_reset_cpu(tr->buffer, cpu); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 568 | ftrace_enable_cpu(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 569 | } |
| 570 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 571 | #define SAVED_CMDLINES 128 |
| 572 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; |
| 573 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; |
| 574 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; |
| 575 | static int cmdline_idx; |
| 576 | static DEFINE_SPINLOCK(trace_cmdline_lock); |
Steven Rostedt | 25b0b44 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 577 | |
Steven Rostedt | 25b0b44 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 578 | /* temporary disable recording */ |
| 579 | atomic_t trace_record_cmdline_disabled __read_mostly; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 580 | |
| 581 | static void trace_init_cmdlines(void) |
| 582 | { |
| 583 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); |
| 584 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); |
| 585 | cmdline_idx = 0; |
| 586 | } |
| 587 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 588 | void trace_stop_cmdline_recording(void); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 589 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 590 | static void trace_save_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 591 | { |
| 592 | unsigned map; |
| 593 | unsigned idx; |
| 594 | |
| 595 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) |
| 596 | return; |
| 597 | |
| 598 | /* |
| 599 | * It's not the end of the world if we don't get |
| 600 | * the lock, but we also don't want to spin |
| 601 | * nor do we want to disable interrupts, |
| 602 | * so if we miss here, then better luck next time. |
| 603 | */ |
| 604 | if (!spin_trylock(&trace_cmdline_lock)) |
| 605 | return; |
| 606 | |
| 607 | idx = map_pid_to_cmdline[tsk->pid]; |
| 608 | if (idx >= SAVED_CMDLINES) { |
| 609 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; |
| 610 | |
| 611 | map = map_cmdline_to_pid[idx]; |
| 612 | if (map <= PID_MAX_DEFAULT) |
| 613 | map_pid_to_cmdline[map] = (unsigned)-1; |
| 614 | |
| 615 | map_pid_to_cmdline[tsk->pid] = idx; |
| 616 | |
| 617 | cmdline_idx = idx; |
| 618 | } |
| 619 | |
| 620 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); |
| 621 | |
| 622 | spin_unlock(&trace_cmdline_lock); |
| 623 | } |
| 624 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 625 | static char *trace_find_cmdline(int pid) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 626 | { |
| 627 | char *cmdline = "<...>"; |
| 628 | unsigned map; |
| 629 | |
| 630 | if (!pid) |
| 631 | return "<idle>"; |
| 632 | |
| 633 | if (pid > PID_MAX_DEFAULT) |
| 634 | goto out; |
| 635 | |
| 636 | map = map_pid_to_cmdline[pid]; |
| 637 | if (map >= SAVED_CMDLINES) |
| 638 | goto out; |
| 639 | |
| 640 | cmdline = saved_cmdlines[map]; |
| 641 | |
| 642 | out: |
| 643 | return cmdline; |
| 644 | } |
| 645 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 646 | void tracing_record_cmdline(struct task_struct *tsk) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 647 | { |
| 648 | if (atomic_read(&trace_record_cmdline_disabled)) |
| 649 | return; |
| 650 | |
| 651 | trace_save_cmdline(tsk); |
| 652 | } |
| 653 | |
Pekka Paalanen | 45dcd8b | 2008-09-16 21:56:41 +0300 | [diff] [blame] | 654 | void |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 655 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
| 656 | int pc) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 657 | { |
| 658 | struct task_struct *tsk = current; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 659 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 660 | entry->preempt_count = pc & 0xff; |
| 661 | entry->pid = (tsk) ? tsk->pid : 0; |
| 662 | entry->flags = |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 663 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 664 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
| 665 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | |
| 666 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); |
| 667 | } |
| 668 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 669 | void |
Steven Rostedt | 6fb44b7 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 670 | trace_function(struct trace_array *tr, struct trace_array_cpu *data, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 671 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
| 672 | int pc) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 673 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 674 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 675 | struct ftrace_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 676 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 677 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 678 | /* If we are reading the ring buffer, don't trace */ |
| 679 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) |
| 680 | return; |
| 681 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 682 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 683 | &irq_flags); |
| 684 | if (!event) |
| 685 | return; |
| 686 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 687 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 688 | entry->ent.type = TRACE_FN; |
| 689 | entry->ip = ip; |
| 690 | entry->parent_ip = parent_ip; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 691 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 692 | } |
| 693 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 694 | void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 695 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 696 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
| 697 | int pc) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 698 | { |
| 699 | if (likely(!atomic_read(&data->disabled))) |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 700 | trace_function(tr, data, ip, parent_ip, flags, pc); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 701 | } |
| 702 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 703 | static void ftrace_trace_stack(struct trace_array *tr, |
| 704 | struct trace_array_cpu *data, |
| 705 | unsigned long flags, |
| 706 | int skip, int pc) |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 707 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 708 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 709 | struct stack_entry *entry; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 710 | struct stack_trace trace; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 711 | unsigned long irq_flags; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 712 | |
| 713 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) |
| 714 | return; |
| 715 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 716 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 717 | &irq_flags); |
| 718 | if (!event) |
| 719 | return; |
| 720 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 721 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 722 | entry->ent.type = TRACE_STACK; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 723 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 724 | memset(&entry->caller, 0, sizeof(entry->caller)); |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 725 | |
| 726 | trace.nr_entries = 0; |
| 727 | trace.max_entries = FTRACE_STACK_ENTRIES; |
| 728 | trace.skip = skip; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 729 | trace.entries = entry->caller; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 730 | |
| 731 | save_stack_trace(&trace); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 732 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 733 | } |
| 734 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 735 | void __trace_stack(struct trace_array *tr, |
| 736 | struct trace_array_cpu *data, |
| 737 | unsigned long flags, |
| 738 | int skip) |
| 739 | { |
| 740 | ftrace_trace_stack(tr, data, flags, skip, preempt_count()); |
| 741 | } |
| 742 | |
| 743 | static void |
| 744 | ftrace_trace_special(void *__tr, void *__data, |
| 745 | unsigned long arg1, unsigned long arg2, unsigned long arg3, |
| 746 | int pc) |
Ingo Molnar | a4feb834 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 747 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 748 | struct ring_buffer_event *event; |
Ingo Molnar | a4feb834 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 749 | struct trace_array_cpu *data = __data; |
| 750 | struct trace_array *tr = __tr; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 751 | struct special_entry *entry; |
Ingo Molnar | a4feb834 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 752 | unsigned long irq_flags; |
| 753 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 754 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 755 | &irq_flags); |
| 756 | if (!event) |
| 757 | return; |
| 758 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 759 | tracing_generic_entry_update(&entry->ent, 0, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 760 | entry->ent.type = TRACE_SPECIAL; |
| 761 | entry->arg1 = arg1; |
| 762 | entry->arg2 = arg2; |
| 763 | entry->arg3 = arg3; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 764 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 765 | ftrace_trace_stack(tr, data, irq_flags, 4, pc); |
Ingo Molnar | a4feb834 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 766 | |
| 767 | trace_wake_up(); |
| 768 | } |
| 769 | |
| 770 | void |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 771 | __trace_special(void *__tr, void *__data, |
| 772 | unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 773 | { |
| 774 | ftrace_trace_special(__tr, __data, arg1, arg2, arg3, preempt_count()); |
| 775 | } |
| 776 | |
| 777 | void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 778 | tracing_sched_switch_trace(struct trace_array *tr, |
| 779 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 780 | struct task_struct *prev, |
| 781 | struct task_struct *next, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 782 | unsigned long flags, int pc) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 783 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 784 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 785 | struct ctx_switch_entry *entry; |
Ingo Molnar | dcb6308 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 786 | unsigned long irq_flags; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 787 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 788 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 789 | &irq_flags); |
| 790 | if (!event) |
| 791 | return; |
| 792 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 793 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 794 | entry->ent.type = TRACE_CTX; |
| 795 | entry->prev_pid = prev->pid; |
| 796 | entry->prev_prio = prev->prio; |
| 797 | entry->prev_state = prev->state; |
| 798 | entry->next_pid = next->pid; |
| 799 | entry->next_prio = next->prio; |
| 800 | entry->next_state = next->state; |
| 801 | entry->next_cpu = task_cpu(next); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 802 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 803 | ftrace_trace_stack(tr, data, flags, 5, pc); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 804 | } |
| 805 | |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 806 | void |
| 807 | tracing_sched_wakeup_trace(struct trace_array *tr, |
| 808 | struct trace_array_cpu *data, |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 809 | struct task_struct *wakee, |
| 810 | struct task_struct *curr, |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 811 | unsigned long flags, int pc) |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 812 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 813 | struct ring_buffer_event *event; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 814 | struct ctx_switch_entry *entry; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 815 | unsigned long irq_flags; |
| 816 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 817 | event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), |
| 818 | &irq_flags); |
| 819 | if (!event) |
| 820 | return; |
| 821 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 822 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 823 | entry->ent.type = TRACE_WAKE; |
| 824 | entry->prev_pid = curr->pid; |
| 825 | entry->prev_prio = curr->prio; |
| 826 | entry->prev_state = curr->state; |
| 827 | entry->next_pid = wakee->pid; |
| 828 | entry->next_prio = wakee->prio; |
| 829 | entry->next_state = wakee->state; |
| 830 | entry->next_cpu = task_cpu(wakee); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 831 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 832 | ftrace_trace_stack(tr, data, flags, 6, pc); |
Ingo Molnar | 017730c | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 833 | |
| 834 | trace_wake_up(); |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 835 | } |
| 836 | |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 837 | void |
| 838 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) |
| 839 | { |
| 840 | struct trace_array *tr = &global_trace; |
| 841 | struct trace_array_cpu *data; |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 842 | int cpu; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 843 | int pc; |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 844 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 845 | if (tracing_disabled || !tr->ctrl) |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 846 | return; |
| 847 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 848 | pc = preempt_count(); |
| 849 | preempt_disable_notrace(); |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 850 | cpu = raw_smp_processor_id(); |
| 851 | data = tr->data[cpu]; |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 852 | |
Steven Rostedt | 3ea2e6d | 2008-10-04 02:01:00 -0400 | [diff] [blame] | 853 | if (likely(!atomic_read(&data->disabled))) |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 854 | ftrace_trace_special(tr, data, arg1, arg2, arg3, pc); |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 855 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 856 | preempt_enable_notrace(); |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 857 | } |
| 858 | |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 859 | #ifdef CONFIG_FTRACE |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 860 | static void |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 861 | function_trace_call(unsigned long ip, unsigned long parent_ip) |
| 862 | { |
| 863 | struct trace_array *tr = &global_trace; |
| 864 | struct trace_array_cpu *data; |
| 865 | unsigned long flags; |
| 866 | long disabled; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 867 | int cpu, resched; |
| 868 | int pc; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 869 | |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 870 | if (unlikely(!ftrace_function_enabled)) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 871 | return; |
| 872 | |
Abhishek Sagar | ecea656 | 2008-06-21 23:47:53 +0530 | [diff] [blame] | 873 | if (skip_trace(ip)) |
| 874 | return; |
| 875 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 876 | pc = preempt_count(); |
| 877 | resched = need_resched(); |
| 878 | preempt_disable_notrace(); |
| 879 | local_save_flags(flags); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 880 | cpu = raw_smp_processor_id(); |
| 881 | data = tr->data[cpu]; |
| 882 | disabled = atomic_inc_return(&data->disabled); |
| 883 | |
| 884 | if (likely(disabled == 1)) |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 885 | trace_function(tr, data, ip, parent_ip, flags, pc); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 886 | |
| 887 | atomic_dec(&data->disabled); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 888 | if (resched) |
| 889 | preempt_enable_no_resched_notrace(); |
| 890 | else |
| 891 | preempt_enable_notrace(); |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 892 | } |
| 893 | |
| 894 | static struct ftrace_ops trace_ops __read_mostly = |
| 895 | { |
| 896 | .func = function_trace_call, |
| 897 | }; |
| 898 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 899 | void tracing_start_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 900 | { |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 901 | ftrace_function_enabled = 0; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 902 | register_ftrace_function(&trace_ops); |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 903 | if (tracer_enabled) |
| 904 | ftrace_function_enabled = 1; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 905 | } |
| 906 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 907 | void tracing_stop_function_trace(void) |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 908 | { |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 909 | ftrace_function_enabled = 0; |
Ingo Molnar | 2e0f576 | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 910 | unregister_ftrace_function(&trace_ops); |
| 911 | } |
| 912 | #endif |
| 913 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 914 | enum trace_file_type { |
| 915 | TRACE_FILE_LAT_FMT = 1, |
| 916 | }; |
| 917 | |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 918 | static void trace_iterator_increment(struct trace_iterator *iter, int cpu) |
| 919 | { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 920 | /* Don't allow ftrace to trace into the ring buffers */ |
| 921 | ftrace_disable_cpu(); |
| 922 | |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 923 | iter->idx++; |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 924 | if (iter->buffer_iter[iter->cpu]) |
| 925 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); |
| 926 | |
| 927 | ftrace_enable_cpu(); |
Steven Rostedt | 5a90f57 | 2008-09-03 17:42:51 -0400 | [diff] [blame] | 928 | } |
| 929 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 930 | static struct trace_entry * |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 931 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 932 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 933 | struct ring_buffer_event *event; |
| 934 | struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu]; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 935 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 936 | /* Don't allow ftrace to trace into the ring buffers */ |
| 937 | ftrace_disable_cpu(); |
| 938 | |
| 939 | if (buf_iter) |
| 940 | event = ring_buffer_iter_peek(buf_iter, ts); |
| 941 | else |
| 942 | event = ring_buffer_peek(iter->tr->buffer, cpu, ts); |
| 943 | |
| 944 | ftrace_enable_cpu(); |
| 945 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 946 | return event ? ring_buffer_event_data(event) : NULL; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 947 | } |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 948 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 949 | static struct trace_entry * |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 950 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 951 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 952 | struct ring_buffer *buffer = iter->tr->buffer; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 953 | struct trace_entry *ent, *next = NULL; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 954 | u64 next_ts = 0, ts; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 955 | int next_cpu = -1; |
| 956 | int cpu; |
| 957 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 958 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 959 | |
| 960 | if (ring_buffer_empty_cpu(buffer, cpu)) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 961 | continue; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 962 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 963 | ent = peek_next_entry(iter, cpu, &ts); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 964 | |
Ingo Molnar | cdd31cd | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 965 | /* |
| 966 | * Pick the entry with the smallest timestamp: |
| 967 | */ |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 968 | if (ent && (!next || ts < next_ts)) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 969 | next = ent; |
| 970 | next_cpu = cpu; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 971 | next_ts = ts; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 972 | } |
| 973 | } |
| 974 | |
| 975 | if (ent_cpu) |
| 976 | *ent_cpu = next_cpu; |
| 977 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 978 | if (ent_ts) |
| 979 | *ent_ts = next_ts; |
| 980 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 981 | return next; |
| 982 | } |
| 983 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 984 | /* Find the next real entry, without updating the iterator itself */ |
| 985 | static struct trace_entry * |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 986 | find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 987 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 988 | return __find_next_entry(iter, ent_cpu, ent_ts); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 989 | } |
Ingo Molnar | 8c523a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 990 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 991 | /* Find the next real entry, and increment the iterator to the next entry */ |
| 992 | static void *find_next_entry_inc(struct trace_iterator *iter) |
| 993 | { |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 994 | iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 995 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 996 | if (iter->ent) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 997 | trace_iterator_increment(iter, iter->cpu); |
| 998 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 999 | return iter->ent ? iter : NULL; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1000 | } |
| 1001 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1002 | static void trace_consume(struct trace_iterator *iter) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1003 | { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1004 | /* Don't allow ftrace to trace into the ring buffers */ |
| 1005 | ftrace_disable_cpu(); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1006 | ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1007 | ftrace_enable_cpu(); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1008 | } |
| 1009 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1010 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1011 | { |
| 1012 | struct trace_iterator *iter = m->private; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1013 | int i = (int)*pos; |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1014 | void *ent; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1015 | |
| 1016 | (*pos)++; |
| 1017 | |
| 1018 | /* can't go backwards */ |
| 1019 | if (iter->idx > i) |
| 1020 | return NULL; |
| 1021 | |
| 1022 | if (iter->idx < 0) |
| 1023 | ent = find_next_entry_inc(iter); |
| 1024 | else |
| 1025 | ent = iter; |
| 1026 | |
| 1027 | while (ent && iter->idx < i) |
| 1028 | ent = find_next_entry_inc(iter); |
| 1029 | |
| 1030 | iter->pos = *pos; |
| 1031 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1032 | return ent; |
| 1033 | } |
| 1034 | |
| 1035 | static void *s_start(struct seq_file *m, loff_t *pos) |
| 1036 | { |
| 1037 | struct trace_iterator *iter = m->private; |
| 1038 | void *p = NULL; |
| 1039 | loff_t l = 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1040 | int cpu; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1041 | |
| 1042 | mutex_lock(&trace_types_lock); |
| 1043 | |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1044 | if (!current_trace || current_trace != iter->trace) { |
| 1045 | mutex_unlock(&trace_types_lock); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1046 | return NULL; |
Steven Rostedt | d15f57f | 2008-05-12 21:20:56 +0200 | [diff] [blame] | 1047 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1048 | |
| 1049 | atomic_inc(&trace_record_cmdline_disabled); |
| 1050 | |
| 1051 | /* let the tracer grab locks here if needed */ |
| 1052 | if (current_trace->start) |
| 1053 | current_trace->start(iter); |
| 1054 | |
| 1055 | if (*pos != iter->pos) { |
| 1056 | iter->ent = NULL; |
| 1057 | iter->cpu = 0; |
| 1058 | iter->idx = -1; |
| 1059 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1060 | ftrace_disable_cpu(); |
| 1061 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1062 | for_each_tracing_cpu(cpu) { |
| 1063 | ring_buffer_iter_reset(iter->buffer_iter[cpu]); |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1064 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1065 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1066 | ftrace_enable_cpu(); |
| 1067 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1068 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
| 1069 | ; |
| 1070 | |
| 1071 | } else { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1072 | l = *pos - 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1073 | p = s_next(m, p, &l); |
| 1074 | } |
| 1075 | |
| 1076 | return p; |
| 1077 | } |
| 1078 | |
| 1079 | static void s_stop(struct seq_file *m, void *p) |
| 1080 | { |
| 1081 | struct trace_iterator *iter = m->private; |
| 1082 | |
| 1083 | atomic_dec(&trace_record_cmdline_disabled); |
| 1084 | |
| 1085 | /* let the tracer release locks here if needed */ |
| 1086 | if (current_trace && current_trace == iter->trace && iter->trace->stop) |
| 1087 | iter->trace->stop(iter); |
| 1088 | |
| 1089 | mutex_unlock(&trace_types_lock); |
| 1090 | } |
| 1091 | |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1092 | #define KRETPROBE_MSG "[unknown/kretprobe'd]" |
| 1093 | |
| 1094 | #ifdef CONFIG_KRETPROBES |
| 1095 | static inline int kretprobed(unsigned long addr) |
| 1096 | { |
| 1097 | return addr == (unsigned long)kretprobe_trampoline; |
| 1098 | } |
| 1099 | #else |
| 1100 | static inline int kretprobed(unsigned long addr) |
| 1101 | { |
| 1102 | return 0; |
| 1103 | } |
| 1104 | #endif /* CONFIG_KRETPROBES */ |
| 1105 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1106 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1107 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1108 | { |
| 1109 | #ifdef CONFIG_KALLSYMS |
| 1110 | char str[KSYM_SYMBOL_LEN]; |
| 1111 | |
| 1112 | kallsyms_lookup(address, NULL, NULL, NULL, str); |
| 1113 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1114 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1115 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1116 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1117 | } |
| 1118 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1119 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1120 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, |
| 1121 | unsigned long address) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1122 | { |
| 1123 | #ifdef CONFIG_KALLSYMS |
| 1124 | char str[KSYM_SYMBOL_LEN]; |
| 1125 | |
| 1126 | sprint_symbol(str, address); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1127 | return trace_seq_printf(s, fmt, str); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1128 | #endif |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1129 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1130 | } |
| 1131 | |
| 1132 | #ifndef CONFIG_64BIT |
| 1133 | # define IP_FMT "%08lx" |
| 1134 | #else |
| 1135 | # define IP_FMT "%016lx" |
| 1136 | #endif |
| 1137 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1138 | static int |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1139 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1140 | { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1141 | int ret; |
| 1142 | |
| 1143 | if (!ip) |
| 1144 | return trace_seq_printf(s, "0"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1145 | |
| 1146 | if (sym_flags & TRACE_ITER_SYM_OFFSET) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1147 | ret = seq_print_sym_offset(s, "%s", ip); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1148 | else |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1149 | ret = seq_print_sym_short(s, "%s", ip); |
| 1150 | |
| 1151 | if (!ret) |
| 1152 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1153 | |
| 1154 | if (sym_flags & TRACE_ITER_SYM_ADDR) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1155 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); |
| 1156 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1157 | } |
| 1158 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1159 | static void print_lat_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1160 | { |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1161 | seq_puts(m, "# _------=> CPU# \n"); |
| 1162 | seq_puts(m, "# / _-----=> irqs-off \n"); |
| 1163 | seq_puts(m, "# | / _----=> need-resched \n"); |
| 1164 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); |
| 1165 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); |
| 1166 | seq_puts(m, "# |||| / \n"); |
| 1167 | seq_puts(m, "# ||||| delay \n"); |
| 1168 | seq_puts(m, "# cmd pid ||||| time | caller \n"); |
| 1169 | seq_puts(m, "# \\ / ||||| \\ | / \n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1170 | } |
| 1171 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1172 | static void print_func_help_header(struct seq_file *m) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1173 | { |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1174 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
| 1175 | seq_puts(m, "# | | | | |\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1176 | } |
| 1177 | |
| 1178 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1179 | static void |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1180 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
| 1181 | { |
| 1182 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
| 1183 | struct trace_array *tr = iter->tr; |
| 1184 | struct trace_array_cpu *data = tr->data[tr->cpu]; |
| 1185 | struct tracer *type = current_trace; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1186 | unsigned long total; |
| 1187 | unsigned long entries; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1188 | const char *name = "preemption"; |
| 1189 | |
| 1190 | if (type) |
| 1191 | name = type->name; |
| 1192 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1193 | entries = ring_buffer_entries(iter->tr->buffer); |
| 1194 | total = entries + |
| 1195 | ring_buffer_overruns(iter->tr->buffer); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1196 | |
| 1197 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", |
| 1198 | name, UTS_RELEASE); |
| 1199 | seq_puts(m, "-----------------------------------" |
| 1200 | "---------------------------------\n"); |
| 1201 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" |
| 1202 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", |
Steven Rostedt | 57f50be | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1203 | nsecs_to_usecs(data->saved_latency), |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1204 | entries, |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 1205 | total, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1206 | tr->cpu, |
| 1207 | #if defined(CONFIG_PREEMPT_NONE) |
| 1208 | "server", |
| 1209 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) |
| 1210 | "desktop", |
Steven Rostedt | b5c21b4 | 2008-07-10 20:58:12 -0400 | [diff] [blame] | 1211 | #elif defined(CONFIG_PREEMPT) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1212 | "preempt", |
| 1213 | #else |
| 1214 | "unknown", |
| 1215 | #endif |
| 1216 | /* These are reserved for later use */ |
| 1217 | 0, 0, 0, 0); |
| 1218 | #ifdef CONFIG_SMP |
| 1219 | seq_printf(m, " #P:%d)\n", num_online_cpus()); |
| 1220 | #else |
| 1221 | seq_puts(m, ")\n"); |
| 1222 | #endif |
| 1223 | seq_puts(m, " -----------------\n"); |
| 1224 | seq_printf(m, " | task: %.16s-%d " |
| 1225 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", |
| 1226 | data->comm, data->pid, data->uid, data->nice, |
| 1227 | data->policy, data->rt_priority); |
| 1228 | seq_puts(m, " -----------------\n"); |
| 1229 | |
| 1230 | if (data->critical_start) { |
| 1231 | seq_puts(m, " => started at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1232 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
| 1233 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1234 | seq_puts(m, "\n => ended at: "); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1235 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
| 1236 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1237 | seq_puts(m, "\n"); |
| 1238 | } |
| 1239 | |
| 1240 | seq_puts(m, "\n"); |
| 1241 | } |
| 1242 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1243 | static void |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1244 | lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1245 | { |
| 1246 | int hardirq, softirq; |
| 1247 | char *comm; |
| 1248 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1249 | comm = trace_find_cmdline(entry->pid); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1250 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1251 | trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid); |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1252 | trace_seq_printf(s, "%3d", cpu); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1253 | trace_seq_printf(s, "%c%c", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1254 | (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : '.', |
| 1255 | ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.')); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1256 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1257 | hardirq = entry->flags & TRACE_FLAG_HARDIRQ; |
| 1258 | softirq = entry->flags & TRACE_FLAG_SOFTIRQ; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1259 | if (hardirq && softirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1260 | trace_seq_putc(s, 'H'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1261 | } else { |
| 1262 | if (hardirq) { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1263 | trace_seq_putc(s, 'h'); |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1264 | } else { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1265 | if (softirq) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1266 | trace_seq_putc(s, 's'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1267 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1268 | trace_seq_putc(s, '.'); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1269 | } |
| 1270 | } |
| 1271 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1272 | if (entry->preempt_count) |
| 1273 | trace_seq_printf(s, "%x", entry->preempt_count); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1274 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1275 | trace_seq_puts(s, "."); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1276 | } |
| 1277 | |
| 1278 | unsigned long preempt_mark_thresh = 100; |
| 1279 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1280 | static void |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1281 | lat_print_timestamp(struct trace_seq *s, u64 abs_usecs, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1282 | unsigned long rel_usecs) |
| 1283 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1284 | trace_seq_printf(s, " %4lldus", abs_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1285 | if (rel_usecs > preempt_mark_thresh) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1286 | trace_seq_puts(s, "!: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1287 | else if (rel_usecs > 1) |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1288 | trace_seq_puts(s, "+: "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1289 | else |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1290 | trace_seq_puts(s, " : "); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1291 | } |
| 1292 | |
| 1293 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; |
| 1294 | |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1295 | /* |
| 1296 | * The message is supposed to contain an ending newline. |
| 1297 | * If the printing stops prematurely, try to add a newline of our own. |
| 1298 | */ |
| 1299 | void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1300 | { |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1301 | struct trace_entry *ent; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1302 | struct trace_field_cont *cont; |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1303 | bool ok = true; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1304 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1305 | ent = peek_next_entry(iter, iter->cpu, NULL); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1306 | if (!ent || ent->type != TRACE_CONT) { |
| 1307 | trace_seq_putc(s, '\n'); |
| 1308 | return; |
| 1309 | } |
| 1310 | |
| 1311 | do { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1312 | cont = (struct trace_field_cont *)ent; |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1313 | if (ok) |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1314 | ok = (trace_seq_printf(s, "%s", cont->buf) > 0); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1315 | |
| 1316 | ftrace_disable_cpu(); |
| 1317 | |
| 1318 | if (iter->buffer_iter[iter->cpu]) |
| 1319 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); |
| 1320 | else |
| 1321 | ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL); |
| 1322 | |
| 1323 | ftrace_enable_cpu(); |
| 1324 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1325 | ent = peek_next_entry(iter, iter->cpu, NULL); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1326 | } while (ent && ent->type == TRACE_CONT); |
Pekka Paalanen | fc5e27a | 2008-09-16 22:02:27 +0300 | [diff] [blame] | 1327 | |
| 1328 | if (!ok) |
| 1329 | trace_seq_putc(s, '\n'); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1330 | } |
| 1331 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1332 | static enum print_line_t |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1333 | print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1334 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1335 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1336 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1337 | struct trace_entry *next_entry; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1338 | unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE); |
| 1339 | struct trace_entry *entry = iter->ent; |
| 1340 | unsigned long abs_usecs; |
| 1341 | unsigned long rel_usecs; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1342 | u64 next_ts; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1343 | char *comm; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1344 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1345 | int i; |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1346 | unsigned state; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1347 | |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1348 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1349 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1350 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1351 | next_entry = find_next_entry(iter, NULL, &next_ts); |
| 1352 | if (!next_entry) |
| 1353 | next_ts = iter->ts; |
| 1354 | rel_usecs = ns2usecs(next_ts - iter->ts); |
| 1355 | abs_usecs = ns2usecs(iter->ts - iter->tr->time_start); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1356 | |
| 1357 | if (verbose) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1358 | comm = trace_find_cmdline(entry->pid); |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1359 | trace_seq_printf(s, "%16s %5d %3d %d %08x %08x [%08lx]" |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1360 | " %ld.%03ldms (+%ld.%03ldms): ", |
| 1361 | comm, |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1362 | entry->pid, cpu, entry->flags, |
| 1363 | entry->preempt_count, trace_idx, |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1364 | ns2usecs(iter->ts), |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1365 | abs_usecs/1000, |
| 1366 | abs_usecs % 1000, rel_usecs/1000, |
| 1367 | rel_usecs % 1000); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1368 | } else { |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1369 | lat_print_generic(s, entry, cpu); |
| 1370 | lat_print_timestamp(s, abs_usecs, rel_usecs); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1371 | } |
| 1372 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1373 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1374 | struct ftrace_entry *field; |
| 1375 | |
| 1376 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1377 | |
| 1378 | seq_print_ip_sym(s, field->ip, sym_flags); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1379 | trace_seq_puts(s, " ("); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1380 | if (kretprobed(field->parent_ip)) |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1381 | trace_seq_puts(s, KRETPROBE_MSG); |
| 1382 | else |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1383 | seq_print_ip_sym(s, field->parent_ip, sym_flags); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1384 | trace_seq_puts(s, ")\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1385 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1386 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1387 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1388 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1389 | struct ctx_switch_entry *field; |
| 1390 | |
| 1391 | trace_assign_type(field, entry); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1392 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1393 | T = field->next_state < sizeof(state_to_char) ? |
| 1394 | state_to_char[field->next_state] : 'X'; |
| 1395 | |
| 1396 | state = field->prev_state ? |
| 1397 | __ffs(field->prev_state) + 1 : 0; |
Ankita Garg | d17d969 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 1398 | S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X'; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1399 | comm = trace_find_cmdline(field->next_pid); |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1400 | trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1401 | field->prev_pid, |
| 1402 | field->prev_prio, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1403 | S, entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1404 | field->next_cpu, |
| 1405 | field->next_pid, |
| 1406 | field->next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1407 | T, comm); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1408 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1409 | } |
| 1410 | case TRACE_SPECIAL: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1411 | struct special_entry *field; |
| 1412 | |
| 1413 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1414 | |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1415 | trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1416 | field->arg1, |
| 1417 | field->arg2, |
| 1418 | field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1419 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1420 | } |
| 1421 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1422 | struct stack_entry *field; |
| 1423 | |
| 1424 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1425 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1426 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1427 | if (i) |
| 1428 | trace_seq_puts(s, " <= "); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1429 | seq_print_ip_sym(s, field->caller[i], sym_flags); |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1430 | } |
| 1431 | trace_seq_puts(s, "\n"); |
| 1432 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1433 | } |
| 1434 | case TRACE_PRINT: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1435 | struct print_entry *field; |
| 1436 | |
| 1437 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1438 | |
| 1439 | seq_print_ip_sym(s, field->ip, sym_flags); |
| 1440 | trace_seq_printf(s, ": %s", field->buf); |
| 1441 | if (entry->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1442 | trace_seq_print_cont(s, iter); |
| 1443 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1444 | } |
Steven Rostedt | 89b2f97 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1445 | default: |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1446 | trace_seq_printf(s, "Unknown type %d\n", entry->type); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1447 | } |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1448 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1449 | } |
| 1450 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1451 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1452 | { |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1453 | struct trace_seq *s = &iter->seq; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1454 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1455 | struct trace_entry *entry; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1456 | unsigned long usec_rem; |
| 1457 | unsigned long long t; |
| 1458 | unsigned long secs; |
| 1459 | char *comm; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1460 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1461 | int S, T; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1462 | int i; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1463 | |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 1464 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1465 | |
| 1466 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1467 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1468 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1469 | comm = trace_find_cmdline(iter->ent->pid); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1470 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1471 | t = ns2usecs(iter->ts); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1472 | usec_rem = do_div(t, 1000000ULL); |
| 1473 | secs = (unsigned long)t; |
| 1474 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1475 | ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1476 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1477 | return TRACE_TYPE_PARTIAL_LINE; |
Michael Ellerman | a616835 | 2008-08-20 16:36:11 -0700 | [diff] [blame] | 1478 | ret = trace_seq_printf(s, "[%03d] ", iter->cpu); |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1479 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1480 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f29c73f | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1481 | ret = trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem); |
| 1482 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1483 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1484 | |
| 1485 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1486 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1487 | struct ftrace_entry *field; |
| 1488 | |
| 1489 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1490 | |
| 1491 | ret = seq_print_ip_sym(s, field->ip, sym_flags); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1492 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1493 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1494 | if ((sym_flags & TRACE_ITER_PRINT_PARENT) && |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1495 | field->parent_ip) { |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1496 | ret = trace_seq_printf(s, " <-"); |
| 1497 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1498 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1499 | if (kretprobed(field->parent_ip)) |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1500 | ret = trace_seq_puts(s, KRETPROBE_MSG); |
| 1501 | else |
Steven Rostedt | 2e2ca15 | 2008-08-01 12:26:40 -0400 | [diff] [blame] | 1502 | ret = seq_print_ip_sym(s, |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1503 | field->parent_ip, |
Abhishek Sagar | 76094a2 | 2008-05-28 00:03:18 +0530 | [diff] [blame] | 1504 | sym_flags); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1505 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1506 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1507 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1508 | ret = trace_seq_printf(s, "\n"); |
| 1509 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1510 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1511 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1512 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1513 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1514 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1515 | struct ctx_switch_entry *field; |
| 1516 | |
| 1517 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1518 | |
| 1519 | S = field->prev_state < sizeof(state_to_char) ? |
| 1520 | state_to_char[field->prev_state] : 'X'; |
| 1521 | T = field->next_state < sizeof(state_to_char) ? |
| 1522 | state_to_char[field->next_state] : 'X'; |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1523 | ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1524 | field->prev_pid, |
| 1525 | field->prev_prio, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1526 | S, |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1527 | entry->type == TRACE_CTX ? "==>" : " +", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1528 | field->next_cpu, |
| 1529 | field->next_pid, |
| 1530 | field->next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1531 | T); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1532 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1533 | return TRACE_TYPE_PARTIAL_LINE; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1534 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1535 | } |
| 1536 | case TRACE_SPECIAL: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1537 | struct special_entry *field; |
| 1538 | |
| 1539 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1540 | |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1541 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1542 | field->arg1, |
| 1543 | field->arg2, |
| 1544 | field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1545 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1546 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1547 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1548 | } |
| 1549 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1550 | struct stack_entry *field; |
| 1551 | |
| 1552 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1553 | |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1554 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { |
| 1555 | if (i) { |
| 1556 | ret = trace_seq_puts(s, " <= "); |
| 1557 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1558 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1559 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1560 | ret = seq_print_ip_sym(s, field->caller[i], |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1561 | sym_flags); |
| 1562 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1563 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1564 | } |
| 1565 | ret = trace_seq_puts(s, "\n"); |
| 1566 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1567 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | 86387f7 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1568 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1569 | } |
| 1570 | case TRACE_PRINT: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1571 | struct print_entry *field; |
| 1572 | |
| 1573 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1574 | |
| 1575 | seq_print_ip_sym(s, field->ip, sym_flags); |
| 1576 | trace_seq_printf(s, ": %s", field->buf); |
| 1577 | if (entry->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1578 | trace_seq_print_cont(s, iter); |
| 1579 | break; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1580 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1581 | } |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1582 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1583 | } |
| 1584 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1585 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1586 | { |
| 1587 | struct trace_seq *s = &iter->seq; |
| 1588 | struct trace_entry *entry; |
| 1589 | int ret; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1590 | int S, T; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1591 | |
| 1592 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1593 | |
| 1594 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1595 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1596 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1597 | ret = trace_seq_printf(s, "%d %d %llu ", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1598 | entry->pid, iter->cpu, iter->ts); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1599 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1600 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1601 | |
| 1602 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1603 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1604 | struct ftrace_entry *field; |
| 1605 | |
| 1606 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1607 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1608 | ret = trace_seq_printf(s, "%x %x\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1609 | field->ip, |
| 1610 | field->parent_ip); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1611 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1612 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1613 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1614 | } |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1615 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1616 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1617 | struct ctx_switch_entry *field; |
| 1618 | |
| 1619 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1620 | |
| 1621 | S = field->prev_state < sizeof(state_to_char) ? |
| 1622 | state_to_char[field->prev_state] : 'X'; |
| 1623 | T = field->next_state < sizeof(state_to_char) ? |
| 1624 | state_to_char[field->next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1625 | if (entry->type == TRACE_WAKE) |
| 1626 | S = '+'; |
Peter Zijlstra | 80b5e94 | 2008-09-04 10:24:16 +0200 | [diff] [blame] | 1627 | ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1628 | field->prev_pid, |
| 1629 | field->prev_prio, |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1630 | S, |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1631 | field->next_cpu, |
| 1632 | field->next_pid, |
| 1633 | field->next_prio, |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1634 | T); |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1635 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1636 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1637 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1638 | } |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1639 | case TRACE_SPECIAL: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1640 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1641 | struct special_entry *field; |
| 1642 | |
| 1643 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1644 | |
Ingo Molnar | 88a4216 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1645 | ret = trace_seq_printf(s, "# %ld %ld %ld\n", |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1646 | field->arg1, |
| 1647 | field->arg2, |
| 1648 | field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1649 | if (!ret) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1650 | return TRACE_TYPE_PARTIAL_LINE; |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1651 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1652 | } |
| 1653 | case TRACE_PRINT: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1654 | struct print_entry *field; |
| 1655 | |
| 1656 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1657 | |
| 1658 | trace_seq_printf(s, "# %lx %s", field->ip, field->buf); |
| 1659 | if (entry->flags & TRACE_FLAG_CONT) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1660 | trace_seq_print_cont(s, iter); |
| 1661 | break; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1662 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1663 | } |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1664 | return TRACE_TYPE_HANDLED; |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1665 | } |
| 1666 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1667 | #define SEQ_PUT_FIELD_RET(s, x) \ |
| 1668 | do { \ |
| 1669 | if (!trace_seq_putmem(s, &(x), sizeof(x))) \ |
| 1670 | return 0; \ |
| 1671 | } while (0) |
| 1672 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1673 | #define SEQ_PUT_HEX_FIELD_RET(s, x) \ |
| 1674 | do { \ |
| 1675 | if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \ |
| 1676 | return 0; \ |
| 1677 | } while (0) |
| 1678 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1679 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1680 | { |
| 1681 | struct trace_seq *s = &iter->seq; |
| 1682 | unsigned char newline = '\n'; |
| 1683 | struct trace_entry *entry; |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1684 | int S, T; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1685 | |
| 1686 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1687 | |
| 1688 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1689 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1690 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1691 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1692 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1693 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1694 | |
| 1695 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1696 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1697 | struct ftrace_entry *field; |
| 1698 | |
| 1699 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1700 | |
| 1701 | SEQ_PUT_HEX_FIELD_RET(s, field->ip); |
| 1702 | SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1703 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1704 | } |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1705 | case TRACE_CTX: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1706 | case TRACE_WAKE: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1707 | struct ctx_switch_entry *field; |
| 1708 | |
| 1709 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1710 | |
| 1711 | S = field->prev_state < sizeof(state_to_char) ? |
| 1712 | state_to_char[field->prev_state] : 'X'; |
| 1713 | T = field->next_state < sizeof(state_to_char) ? |
| 1714 | state_to_char[field->next_state] : 'X'; |
Ingo Molnar | 5742279 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1715 | if (entry->type == TRACE_WAKE) |
| 1716 | S = '+'; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1717 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); |
| 1718 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1719 | SEQ_PUT_HEX_FIELD_RET(s, S); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1720 | SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); |
| 1721 | SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); |
| 1722 | SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); |
Peter Zijlstra | bac524d | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 1723 | SEQ_PUT_HEX_FIELD_RET(s, T); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1724 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1725 | } |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1726 | case TRACE_SPECIAL: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1727 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1728 | struct special_entry *field; |
| 1729 | |
| 1730 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1731 | |
| 1732 | SEQ_PUT_HEX_FIELD_RET(s, field->arg1); |
| 1733 | SEQ_PUT_HEX_FIELD_RET(s, field->arg2); |
| 1734 | SEQ_PUT_HEX_FIELD_RET(s, field->arg3); |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1735 | break; |
| 1736 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1737 | } |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1738 | SEQ_PUT_FIELD_RET(s, newline); |
| 1739 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1740 | return TRACE_TYPE_HANDLED; |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1741 | } |
| 1742 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1743 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1744 | { |
| 1745 | struct trace_seq *s = &iter->seq; |
| 1746 | struct trace_entry *entry; |
| 1747 | |
| 1748 | entry = iter->ent; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1749 | |
| 1750 | if (entry->type == TRACE_CONT) |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1751 | return TRACE_TYPE_HANDLED; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 1752 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1753 | SEQ_PUT_FIELD_RET(s, entry->pid); |
| 1754 | SEQ_PUT_FIELD_RET(s, iter->cpu); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1755 | SEQ_PUT_FIELD_RET(s, iter->ts); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1756 | |
| 1757 | switch (entry->type) { |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1758 | case TRACE_FN: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1759 | struct ftrace_entry *field; |
| 1760 | |
| 1761 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1762 | |
| 1763 | SEQ_PUT_FIELD_RET(s, field->ip); |
| 1764 | SEQ_PUT_FIELD_RET(s, field->parent_ip); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1765 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1766 | } |
| 1767 | case TRACE_CTX: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1768 | struct ctx_switch_entry *field; |
| 1769 | |
| 1770 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1771 | |
| 1772 | SEQ_PUT_FIELD_RET(s, field->prev_pid); |
| 1773 | SEQ_PUT_FIELD_RET(s, field->prev_prio); |
| 1774 | SEQ_PUT_FIELD_RET(s, field->prev_state); |
| 1775 | SEQ_PUT_FIELD_RET(s, field->next_pid); |
| 1776 | SEQ_PUT_FIELD_RET(s, field->next_prio); |
| 1777 | SEQ_PUT_FIELD_RET(s, field->next_state); |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1778 | break; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1779 | } |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1780 | case TRACE_SPECIAL: |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1781 | case TRACE_STACK: { |
Steven Rostedt | 7104f30 | 2008-10-01 10:52:51 -0400 | [diff] [blame] | 1782 | struct special_entry *field; |
| 1783 | |
| 1784 | trace_assign_type(field, entry); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1785 | |
| 1786 | SEQ_PUT_FIELD_RET(s, field->arg1); |
| 1787 | SEQ_PUT_FIELD_RET(s, field->arg2); |
| 1788 | SEQ_PUT_FIELD_RET(s, field->arg3); |
Ingo Molnar | f0a920d | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1789 | break; |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1790 | } |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 1791 | } |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1792 | return 1; |
| 1793 | } |
| 1794 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1795 | static int trace_empty(struct trace_iterator *iter) |
| 1796 | { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1797 | int cpu; |
| 1798 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 1799 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1800 | if (iter->buffer_iter[cpu]) { |
| 1801 | if (!ring_buffer_iter_empty(iter->buffer_iter[cpu])) |
| 1802 | return 0; |
| 1803 | } else { |
| 1804 | if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) |
| 1805 | return 0; |
| 1806 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1807 | } |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1808 | |
Frederic Weisbecker | 797d371 | 2008-09-30 18:13:45 +0200 | [diff] [blame] | 1809 | return 1; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1810 | } |
| 1811 | |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1812 | static enum print_line_t print_trace_line(struct trace_iterator *iter) |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1813 | { |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 1814 | enum print_line_t ret; |
| 1815 | |
| 1816 | if (iter->trace && iter->trace->print_line) { |
| 1817 | ret = iter->trace->print_line(iter); |
| 1818 | if (ret != TRACE_TYPE_UNHANDLED) |
| 1819 | return ret; |
| 1820 | } |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 1821 | |
Ingo Molnar | cb0f12a | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1822 | if (trace_flags & TRACE_ITER_BIN) |
| 1823 | return print_bin_fmt(iter); |
| 1824 | |
Ingo Molnar | 5e3ca0e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 1825 | if (trace_flags & TRACE_ITER_HEX) |
| 1826 | return print_hex_fmt(iter); |
| 1827 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1828 | if (trace_flags & TRACE_ITER_RAW) |
| 1829 | return print_raw_fmt(iter); |
| 1830 | |
| 1831 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) |
| 1832 | return print_lat_fmt(iter, iter->idx, iter->cpu); |
| 1833 | |
| 1834 | return print_trace_fmt(iter); |
| 1835 | } |
| 1836 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1837 | static int s_show(struct seq_file *m, void *v) |
| 1838 | { |
| 1839 | struct trace_iterator *iter = v; |
| 1840 | |
| 1841 | if (iter->ent == NULL) { |
| 1842 | if (iter->tr) { |
| 1843 | seq_printf(m, "# tracer: %s\n", iter->trace->name); |
| 1844 | seq_puts(m, "#\n"); |
| 1845 | } |
| 1846 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) { |
| 1847 | /* print nothing if the buffers are empty */ |
| 1848 | if (trace_empty(iter)) |
| 1849 | return 0; |
| 1850 | print_trace_header(m, iter); |
| 1851 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1852 | print_lat_help_header(m); |
| 1853 | } else { |
| 1854 | if (!(trace_flags & TRACE_ITER_VERBOSE)) |
| 1855 | print_func_help_header(m); |
| 1856 | } |
| 1857 | } else { |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 1858 | print_trace_line(iter); |
Steven Rostedt | 214023c | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1859 | trace_print_seq(m, &iter->seq); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1860 | } |
| 1861 | |
| 1862 | return 0; |
| 1863 | } |
| 1864 | |
| 1865 | static struct seq_operations tracer_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 1866 | .start = s_start, |
| 1867 | .next = s_next, |
| 1868 | .stop = s_stop, |
| 1869 | .show = s_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1870 | }; |
| 1871 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 1872 | static struct trace_iterator * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1873 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
| 1874 | { |
| 1875 | struct trace_iterator *iter; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1876 | struct seq_file *m; |
| 1877 | int cpu; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1878 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1879 | if (tracing_disabled) { |
| 1880 | *ret = -ENODEV; |
| 1881 | return NULL; |
| 1882 | } |
| 1883 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1884 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 1885 | if (!iter) { |
| 1886 | *ret = -ENOMEM; |
| 1887 | goto out; |
| 1888 | } |
| 1889 | |
| 1890 | mutex_lock(&trace_types_lock); |
| 1891 | if (current_trace && current_trace->print_max) |
| 1892 | iter->tr = &max_tr; |
| 1893 | else |
| 1894 | iter->tr = inode->i_private; |
| 1895 | iter->trace = current_trace; |
| 1896 | iter->pos = -1; |
| 1897 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1898 | for_each_tracing_cpu(cpu) { |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1899 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1900 | iter->buffer_iter[cpu] = |
| 1901 | ring_buffer_read_start(iter->tr->buffer, cpu); |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 1902 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1903 | if (!iter->buffer_iter[cpu]) |
| 1904 | goto fail_buffer; |
| 1905 | } |
| 1906 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1907 | /* TODO stop tracer */ |
| 1908 | *ret = seq_open(file, &tracer_seq_ops); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1909 | if (*ret) |
| 1910 | goto fail_buffer; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1911 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1912 | m = file->private_data; |
| 1913 | m->private = iter; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1914 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1915 | /* stop the trace while dumping */ |
| 1916 | if (iter->tr->ctrl) { |
| 1917 | tracer_enabled = 0; |
| 1918 | ftrace_function_enabled = 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1919 | } |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1920 | |
| 1921 | if (iter->trace && iter->trace->open) |
| 1922 | iter->trace->open(iter); |
| 1923 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1924 | mutex_unlock(&trace_types_lock); |
| 1925 | |
| 1926 | out: |
| 1927 | return iter; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1928 | |
| 1929 | fail_buffer: |
| 1930 | for_each_tracing_cpu(cpu) { |
| 1931 | if (iter->buffer_iter[cpu]) |
| 1932 | ring_buffer_read_finish(iter->buffer_iter[cpu]); |
| 1933 | } |
| 1934 | mutex_unlock(&trace_types_lock); |
| 1935 | |
| 1936 | return ERR_PTR(-ENOMEM); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1937 | } |
| 1938 | |
| 1939 | int tracing_open_generic(struct inode *inode, struct file *filp) |
| 1940 | { |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 1941 | if (tracing_disabled) |
| 1942 | return -ENODEV; |
| 1943 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1944 | filp->private_data = inode->i_private; |
| 1945 | return 0; |
| 1946 | } |
| 1947 | |
| 1948 | int tracing_release(struct inode *inode, struct file *file) |
| 1949 | { |
| 1950 | struct seq_file *m = (struct seq_file *)file->private_data; |
| 1951 | struct trace_iterator *iter = m->private; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1952 | int cpu; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1953 | |
| 1954 | mutex_lock(&trace_types_lock); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 1955 | for_each_tracing_cpu(cpu) { |
| 1956 | if (iter->buffer_iter[cpu]) |
| 1957 | ring_buffer_read_finish(iter->buffer_iter[cpu]); |
| 1958 | } |
| 1959 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1960 | if (iter->trace && iter->trace->close) |
| 1961 | iter->trace->close(iter); |
| 1962 | |
| 1963 | /* reenable tracing if it was previously enabled */ |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 1964 | if (iter->tr->ctrl) { |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1965 | tracer_enabled = 1; |
Steven Rostedt | 60bc080 | 2008-07-10 20:58:16 -0400 | [diff] [blame] | 1966 | /* |
| 1967 | * It is safe to enable function tracing even if it |
| 1968 | * isn't used |
| 1969 | */ |
| 1970 | ftrace_function_enabled = 1; |
| 1971 | } |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 1972 | mutex_unlock(&trace_types_lock); |
| 1973 | |
| 1974 | seq_release(inode, file); |
| 1975 | kfree(iter); |
| 1976 | return 0; |
| 1977 | } |
| 1978 | |
| 1979 | static int tracing_open(struct inode *inode, struct file *file) |
| 1980 | { |
| 1981 | int ret; |
| 1982 | |
| 1983 | __tracing_open(inode, file, &ret); |
| 1984 | |
| 1985 | return ret; |
| 1986 | } |
| 1987 | |
| 1988 | static int tracing_lt_open(struct inode *inode, struct file *file) |
| 1989 | { |
| 1990 | struct trace_iterator *iter; |
| 1991 | int ret; |
| 1992 | |
| 1993 | iter = __tracing_open(inode, file, &ret); |
| 1994 | |
| 1995 | if (!ret) |
| 1996 | iter->iter_flags |= TRACE_FILE_LAT_FMT; |
| 1997 | |
| 1998 | return ret; |
| 1999 | } |
| 2000 | |
| 2001 | |
Ingo Molnar | e309b41 | 2008-05-12 21:20:51 +0200 | [diff] [blame] | 2002 | static void * |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2003 | t_next(struct seq_file *m, void *v, loff_t *pos) |
| 2004 | { |
| 2005 | struct tracer *t = m->private; |
| 2006 | |
| 2007 | (*pos)++; |
| 2008 | |
| 2009 | if (t) |
| 2010 | t = t->next; |
| 2011 | |
| 2012 | m->private = t; |
| 2013 | |
| 2014 | return t; |
| 2015 | } |
| 2016 | |
| 2017 | static void *t_start(struct seq_file *m, loff_t *pos) |
| 2018 | { |
| 2019 | struct tracer *t = m->private; |
| 2020 | loff_t l = 0; |
| 2021 | |
| 2022 | mutex_lock(&trace_types_lock); |
| 2023 | for (; t && l < *pos; t = t_next(m, t, &l)) |
| 2024 | ; |
| 2025 | |
| 2026 | return t; |
| 2027 | } |
| 2028 | |
| 2029 | static void t_stop(struct seq_file *m, void *p) |
| 2030 | { |
| 2031 | mutex_unlock(&trace_types_lock); |
| 2032 | } |
| 2033 | |
| 2034 | static int t_show(struct seq_file *m, void *v) |
| 2035 | { |
| 2036 | struct tracer *t = v; |
| 2037 | |
| 2038 | if (!t) |
| 2039 | return 0; |
| 2040 | |
| 2041 | seq_printf(m, "%s", t->name); |
| 2042 | if (t->next) |
| 2043 | seq_putc(m, ' '); |
| 2044 | else |
| 2045 | seq_putc(m, '\n'); |
| 2046 | |
| 2047 | return 0; |
| 2048 | } |
| 2049 | |
| 2050 | static struct seq_operations show_traces_seq_ops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2051 | .start = t_start, |
| 2052 | .next = t_next, |
| 2053 | .stop = t_stop, |
| 2054 | .show = t_show, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2055 | }; |
| 2056 | |
| 2057 | static int show_traces_open(struct inode *inode, struct file *file) |
| 2058 | { |
| 2059 | int ret; |
| 2060 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2061 | if (tracing_disabled) |
| 2062 | return -ENODEV; |
| 2063 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2064 | ret = seq_open(file, &show_traces_seq_ops); |
| 2065 | if (!ret) { |
| 2066 | struct seq_file *m = file->private_data; |
| 2067 | m->private = trace_types; |
| 2068 | } |
| 2069 | |
| 2070 | return ret; |
| 2071 | } |
| 2072 | |
| 2073 | static struct file_operations tracing_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2074 | .open = tracing_open, |
| 2075 | .read = seq_read, |
| 2076 | .llseek = seq_lseek, |
| 2077 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2078 | }; |
| 2079 | |
| 2080 | static struct file_operations tracing_lt_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2081 | .open = tracing_lt_open, |
| 2082 | .read = seq_read, |
| 2083 | .llseek = seq_lseek, |
| 2084 | .release = tracing_release, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2085 | }; |
| 2086 | |
| 2087 | static struct file_operations show_traces_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2088 | .open = show_traces_open, |
| 2089 | .read = seq_read, |
| 2090 | .release = seq_release, |
| 2091 | }; |
| 2092 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2093 | /* |
| 2094 | * Only trace on a CPU if the bitmask is set: |
| 2095 | */ |
| 2096 | static cpumask_t tracing_cpumask = CPU_MASK_ALL; |
| 2097 | |
| 2098 | /* |
| 2099 | * When tracing/tracing_cpu_mask is modified then this holds |
| 2100 | * the new bitmask we are about to install: |
| 2101 | */ |
| 2102 | static cpumask_t tracing_cpumask_new; |
| 2103 | |
| 2104 | /* |
| 2105 | * The tracer itself will not take this lock, but still we want |
| 2106 | * to provide a consistent cpumask to user-space: |
| 2107 | */ |
| 2108 | static DEFINE_MUTEX(tracing_cpumask_update_lock); |
| 2109 | |
| 2110 | /* |
| 2111 | * Temporary storage for the character representation of the |
| 2112 | * CPU bitmask (and one more byte for the newline): |
| 2113 | */ |
| 2114 | static char mask_str[NR_CPUS + 1]; |
| 2115 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2116 | static ssize_t |
| 2117 | tracing_cpumask_read(struct file *filp, char __user *ubuf, |
| 2118 | size_t count, loff_t *ppos) |
| 2119 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2120 | int len; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2121 | |
| 2122 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2123 | |
| 2124 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); |
| 2125 | if (count - len < 2) { |
| 2126 | count = -EINVAL; |
| 2127 | goto out_err; |
| 2128 | } |
| 2129 | len += sprintf(mask_str + len, "\n"); |
| 2130 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); |
| 2131 | |
| 2132 | out_err: |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2133 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2134 | |
| 2135 | return count; |
| 2136 | } |
| 2137 | |
| 2138 | static ssize_t |
| 2139 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, |
| 2140 | size_t count, loff_t *ppos) |
| 2141 | { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2142 | int err, cpu; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2143 | |
| 2144 | mutex_lock(&tracing_cpumask_update_lock); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2145 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
| 2146 | if (err) |
| 2147 | goto err_unlock; |
| 2148 | |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2149 | raw_local_irq_disable(); |
| 2150 | __raw_spin_lock(&ftrace_max_lock); |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2151 | for_each_tracing_cpu(cpu) { |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2152 | /* |
| 2153 | * Increase/decrease the disabled counter if we are |
| 2154 | * about to flip a bit in the cpumask: |
| 2155 | */ |
| 2156 | if (cpu_isset(cpu, tracing_cpumask) && |
| 2157 | !cpu_isset(cpu, tracing_cpumask_new)) { |
| 2158 | atomic_inc(&global_trace.data[cpu]->disabled); |
| 2159 | } |
| 2160 | if (!cpu_isset(cpu, tracing_cpumask) && |
| 2161 | cpu_isset(cpu, tracing_cpumask_new)) { |
| 2162 | atomic_dec(&global_trace.data[cpu]->disabled); |
| 2163 | } |
| 2164 | } |
Steven Rostedt | 92205c2 | 2008-05-12 21:20:55 +0200 | [diff] [blame] | 2165 | __raw_spin_unlock(&ftrace_max_lock); |
| 2166 | raw_local_irq_enable(); |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2167 | |
| 2168 | tracing_cpumask = tracing_cpumask_new; |
| 2169 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2170 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2171 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2172 | return count; |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2173 | |
| 2174 | err_unlock: |
| 2175 | mutex_unlock(&tracing_cpumask_update_lock); |
| 2176 | |
| 2177 | return err; |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2178 | } |
| 2179 | |
| 2180 | static struct file_operations tracing_cpumask_fops = { |
| 2181 | .open = tracing_open_generic, |
| 2182 | .read = tracing_cpumask_read, |
| 2183 | .write = tracing_cpumask_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2184 | }; |
| 2185 | |
| 2186 | static ssize_t |
| 2187 | tracing_iter_ctrl_read(struct file *filp, char __user *ubuf, |
| 2188 | size_t cnt, loff_t *ppos) |
| 2189 | { |
| 2190 | char *buf; |
| 2191 | int r = 0; |
| 2192 | int len = 0; |
| 2193 | int i; |
| 2194 | |
| 2195 | /* calulate max size */ |
| 2196 | for (i = 0; trace_options[i]; i++) { |
| 2197 | len += strlen(trace_options[i]); |
| 2198 | len += 3; /* "no" and space */ |
| 2199 | } |
| 2200 | |
| 2201 | /* +2 for \n and \0 */ |
| 2202 | buf = kmalloc(len + 2, GFP_KERNEL); |
| 2203 | if (!buf) |
| 2204 | return -ENOMEM; |
| 2205 | |
| 2206 | for (i = 0; trace_options[i]; i++) { |
| 2207 | if (trace_flags & (1 << i)) |
| 2208 | r += sprintf(buf + r, "%s ", trace_options[i]); |
| 2209 | else |
| 2210 | r += sprintf(buf + r, "no%s ", trace_options[i]); |
| 2211 | } |
| 2212 | |
| 2213 | r += sprintf(buf + r, "\n"); |
| 2214 | WARN_ON(r >= len + 2); |
| 2215 | |
Ingo Molnar | 36dfe92 | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2216 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2217 | |
| 2218 | kfree(buf); |
| 2219 | |
| 2220 | return r; |
| 2221 | } |
| 2222 | |
| 2223 | static ssize_t |
| 2224 | tracing_iter_ctrl_write(struct file *filp, const char __user *ubuf, |
| 2225 | size_t cnt, loff_t *ppos) |
| 2226 | { |
| 2227 | char buf[64]; |
| 2228 | char *cmp = buf; |
| 2229 | int neg = 0; |
| 2230 | int i; |
| 2231 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2232 | if (cnt >= sizeof(buf)) |
| 2233 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2234 | |
| 2235 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2236 | return -EFAULT; |
| 2237 | |
| 2238 | buf[cnt] = 0; |
| 2239 | |
| 2240 | if (strncmp(buf, "no", 2) == 0) { |
| 2241 | neg = 1; |
| 2242 | cmp += 2; |
| 2243 | } |
| 2244 | |
| 2245 | for (i = 0; trace_options[i]; i++) { |
| 2246 | int len = strlen(trace_options[i]); |
| 2247 | |
| 2248 | if (strncmp(cmp, trace_options[i], len) == 0) { |
| 2249 | if (neg) |
| 2250 | trace_flags &= ~(1 << i); |
| 2251 | else |
| 2252 | trace_flags |= (1 << i); |
| 2253 | break; |
| 2254 | } |
| 2255 | } |
Ingo Molnar | 442e544 | 2008-05-12 21:20:53 +0200 | [diff] [blame] | 2256 | /* |
| 2257 | * If no option could be set, return an error: |
| 2258 | */ |
| 2259 | if (!trace_options[i]) |
| 2260 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2261 | |
| 2262 | filp->f_pos += cnt; |
| 2263 | |
| 2264 | return cnt; |
| 2265 | } |
| 2266 | |
| 2267 | static struct file_operations tracing_iter_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2268 | .open = tracing_open_generic, |
| 2269 | .read = tracing_iter_ctrl_read, |
| 2270 | .write = tracing_iter_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2271 | }; |
| 2272 | |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2273 | static const char readme_msg[] = |
| 2274 | "tracing mini-HOWTO:\n\n" |
| 2275 | "# mkdir /debug\n" |
| 2276 | "# mount -t debugfs nodev /debug\n\n" |
| 2277 | "# cat /debug/tracing/available_tracers\n" |
| 2278 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" |
| 2279 | "# cat /debug/tracing/current_tracer\n" |
| 2280 | "none\n" |
| 2281 | "# echo sched_switch > /debug/tracing/current_tracer\n" |
| 2282 | "# cat /debug/tracing/current_tracer\n" |
| 2283 | "sched_switch\n" |
| 2284 | "# cat /debug/tracing/iter_ctrl\n" |
| 2285 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
| 2286 | "# echo print-parent > /debug/tracing/iter_ctrl\n" |
| 2287 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
| 2288 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" |
| 2289 | "echo 0 > /debug/tracing/tracing_enabled\n" |
| 2290 | ; |
| 2291 | |
| 2292 | static ssize_t |
| 2293 | tracing_readme_read(struct file *filp, char __user *ubuf, |
| 2294 | size_t cnt, loff_t *ppos) |
| 2295 | { |
| 2296 | return simple_read_from_buffer(ubuf, cnt, ppos, |
| 2297 | readme_msg, strlen(readme_msg)); |
| 2298 | } |
| 2299 | |
| 2300 | static struct file_operations tracing_readme_fops = { |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2301 | .open = tracing_open_generic, |
| 2302 | .read = tracing_readme_read, |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2303 | }; |
| 2304 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2305 | static ssize_t |
| 2306 | tracing_ctrl_read(struct file *filp, char __user *ubuf, |
| 2307 | size_t cnt, loff_t *ppos) |
| 2308 | { |
| 2309 | struct trace_array *tr = filp->private_data; |
| 2310 | char buf[64]; |
| 2311 | int r; |
| 2312 | |
| 2313 | r = sprintf(buf, "%ld\n", tr->ctrl); |
Ingo Molnar | 4e3c333 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2314 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2315 | } |
| 2316 | |
| 2317 | static ssize_t |
| 2318 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, |
| 2319 | size_t cnt, loff_t *ppos) |
| 2320 | { |
| 2321 | struct trace_array *tr = filp->private_data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2322 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2323 | long val; |
| 2324 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2325 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2326 | if (cnt >= sizeof(buf)) |
| 2327 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2328 | |
| 2329 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2330 | return -EFAULT; |
| 2331 | |
| 2332 | buf[cnt] = 0; |
| 2333 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2334 | ret = strict_strtoul(buf, 10, &val); |
| 2335 | if (ret < 0) |
| 2336 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2337 | |
| 2338 | val = !!val; |
| 2339 | |
| 2340 | mutex_lock(&trace_types_lock); |
| 2341 | if (tr->ctrl ^ val) { |
| 2342 | if (val) |
| 2343 | tracer_enabled = 1; |
| 2344 | else |
| 2345 | tracer_enabled = 0; |
| 2346 | |
| 2347 | tr->ctrl = val; |
| 2348 | |
| 2349 | if (current_trace && current_trace->ctrl_update) |
| 2350 | current_trace->ctrl_update(tr); |
| 2351 | } |
| 2352 | mutex_unlock(&trace_types_lock); |
| 2353 | |
| 2354 | filp->f_pos += cnt; |
| 2355 | |
| 2356 | return cnt; |
| 2357 | } |
| 2358 | |
| 2359 | static ssize_t |
| 2360 | tracing_set_trace_read(struct file *filp, char __user *ubuf, |
| 2361 | size_t cnt, loff_t *ppos) |
| 2362 | { |
| 2363 | char buf[max_tracer_type_len+2]; |
| 2364 | int r; |
| 2365 | |
| 2366 | mutex_lock(&trace_types_lock); |
| 2367 | if (current_trace) |
| 2368 | r = sprintf(buf, "%s\n", current_trace->name); |
| 2369 | else |
| 2370 | r = sprintf(buf, "\n"); |
| 2371 | mutex_unlock(&trace_types_lock); |
| 2372 | |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2373 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2374 | } |
| 2375 | |
| 2376 | static ssize_t |
| 2377 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, |
| 2378 | size_t cnt, loff_t *ppos) |
| 2379 | { |
| 2380 | struct trace_array *tr = &global_trace; |
| 2381 | struct tracer *t; |
| 2382 | char buf[max_tracer_type_len+1]; |
| 2383 | int i; |
Frederic Weisbecker | c2931e0 | 2008-10-04 22:04:44 +0200 | [diff] [blame^] | 2384 | size_t ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2385 | |
| 2386 | if (cnt > max_tracer_type_len) |
| 2387 | cnt = max_tracer_type_len; |
Frederic Weisbecker | c2931e0 | 2008-10-04 22:04:44 +0200 | [diff] [blame^] | 2388 | ret = cnt; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2389 | |
| 2390 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2391 | return -EFAULT; |
| 2392 | |
| 2393 | buf[cnt] = 0; |
| 2394 | |
| 2395 | /* strip ending whitespace. */ |
| 2396 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) |
| 2397 | buf[i] = 0; |
| 2398 | |
| 2399 | mutex_lock(&trace_types_lock); |
| 2400 | for (t = trace_types; t; t = t->next) { |
| 2401 | if (strcmp(t->name, buf) == 0) |
| 2402 | break; |
| 2403 | } |
Frederic Weisbecker | c2931e0 | 2008-10-04 22:04:44 +0200 | [diff] [blame^] | 2404 | if (!t) { |
| 2405 | ret = -EINVAL; |
| 2406 | goto out; |
| 2407 | } |
| 2408 | if (t == current_trace) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2409 | goto out; |
| 2410 | |
| 2411 | if (current_trace && current_trace->reset) |
| 2412 | current_trace->reset(tr); |
| 2413 | |
| 2414 | current_trace = t; |
| 2415 | if (t->init) |
| 2416 | t->init(tr); |
| 2417 | |
| 2418 | out: |
| 2419 | mutex_unlock(&trace_types_lock); |
| 2420 | |
Frederic Weisbecker | c2931e0 | 2008-10-04 22:04:44 +0200 | [diff] [blame^] | 2421 | if (ret == cnt) |
| 2422 | filp->f_pos += cnt; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2423 | |
Frederic Weisbecker | c2931e0 | 2008-10-04 22:04:44 +0200 | [diff] [blame^] | 2424 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2425 | } |
| 2426 | |
| 2427 | static ssize_t |
| 2428 | tracing_max_lat_read(struct file *filp, char __user *ubuf, |
| 2429 | size_t cnt, loff_t *ppos) |
| 2430 | { |
| 2431 | unsigned long *ptr = filp->private_data; |
| 2432 | char buf[64]; |
| 2433 | int r; |
| 2434 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2435 | r = snprintf(buf, sizeof(buf), "%ld\n", |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2436 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2437 | if (r > sizeof(buf)) |
| 2438 | r = sizeof(buf); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2439 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2440 | } |
| 2441 | |
| 2442 | static ssize_t |
| 2443 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, |
| 2444 | size_t cnt, loff_t *ppos) |
| 2445 | { |
| 2446 | long *ptr = filp->private_data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2447 | char buf[64]; |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2448 | long val; |
| 2449 | int ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2450 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2451 | if (cnt >= sizeof(buf)) |
| 2452 | return -EINVAL; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2453 | |
| 2454 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2455 | return -EFAULT; |
| 2456 | |
| 2457 | buf[cnt] = 0; |
| 2458 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2459 | ret = strict_strtoul(buf, 10, &val); |
| 2460 | if (ret < 0) |
| 2461 | return ret; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2462 | |
| 2463 | *ptr = val * 1000; |
| 2464 | |
| 2465 | return cnt; |
| 2466 | } |
| 2467 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2468 | static atomic_t tracing_reader; |
| 2469 | |
| 2470 | static int tracing_open_pipe(struct inode *inode, struct file *filp) |
| 2471 | { |
| 2472 | struct trace_iterator *iter; |
| 2473 | |
| 2474 | if (tracing_disabled) |
| 2475 | return -ENODEV; |
| 2476 | |
| 2477 | /* We only allow for reader of the pipe */ |
| 2478 | if (atomic_inc_return(&tracing_reader) != 1) { |
| 2479 | atomic_dec(&tracing_reader); |
| 2480 | return -EBUSY; |
| 2481 | } |
| 2482 | |
| 2483 | /* create a buffer to store the information to pass to userspace */ |
| 2484 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
| 2485 | if (!iter) |
| 2486 | return -ENOMEM; |
| 2487 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2488 | mutex_lock(&trace_types_lock); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2489 | iter->tr = &global_trace; |
Thomas Gleixner | 72829bc | 2008-05-23 21:37:28 +0200 | [diff] [blame] | 2490 | iter->trace = current_trace; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2491 | filp->private_data = iter; |
| 2492 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2493 | if (iter->trace->pipe_open) |
| 2494 | iter->trace->pipe_open(iter); |
| 2495 | mutex_unlock(&trace_types_lock); |
| 2496 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2497 | return 0; |
| 2498 | } |
| 2499 | |
| 2500 | static int tracing_release_pipe(struct inode *inode, struct file *file) |
| 2501 | { |
| 2502 | struct trace_iterator *iter = file->private_data; |
| 2503 | |
| 2504 | kfree(iter); |
| 2505 | atomic_dec(&tracing_reader); |
| 2506 | |
| 2507 | return 0; |
| 2508 | } |
| 2509 | |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2510 | static unsigned int |
| 2511 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) |
| 2512 | { |
| 2513 | struct trace_iterator *iter = filp->private_data; |
| 2514 | |
| 2515 | if (trace_flags & TRACE_ITER_BLOCK) { |
| 2516 | /* |
| 2517 | * Always select as readable when in blocking mode |
| 2518 | */ |
| 2519 | return POLLIN | POLLRDNORM; |
Ingo Molnar | afc2abc | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2520 | } else { |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2521 | if (!trace_empty(iter)) |
| 2522 | return POLLIN | POLLRDNORM; |
| 2523 | poll_wait(filp, &trace_wait, poll_table); |
| 2524 | if (!trace_empty(iter)) |
| 2525 | return POLLIN | POLLRDNORM; |
| 2526 | |
| 2527 | return 0; |
| 2528 | } |
| 2529 | } |
| 2530 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2531 | /* |
| 2532 | * Consumer reader. |
| 2533 | */ |
| 2534 | static ssize_t |
| 2535 | tracing_read_pipe(struct file *filp, char __user *ubuf, |
| 2536 | size_t cnt, loff_t *ppos) |
| 2537 | { |
| 2538 | struct trace_iterator *iter = filp->private_data; |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2539 | ssize_t sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2540 | |
| 2541 | /* return any leftover data */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2542 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
| 2543 | if (sret != -EBUSY) |
| 2544 | return sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2545 | |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2546 | trace_seq_reset(&iter->seq); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2547 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2548 | mutex_lock(&trace_types_lock); |
| 2549 | if (iter->trace->read) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2550 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
| 2551 | if (sret) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2552 | goto out; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2553 | } |
| 2554 | |
Pekka Paalanen | 9ff4b97 | 2008-09-29 20:23:48 +0200 | [diff] [blame] | 2555 | waitagain: |
| 2556 | sret = 0; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2557 | while (trace_empty(iter)) { |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2558 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2559 | if ((filp->f_flags & O_NONBLOCK)) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2560 | sret = -EAGAIN; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2561 | goto out; |
| 2562 | } |
Steven Rostedt | 2dc8f09 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2563 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2564 | /* |
| 2565 | * This is a make-shift waitqueue. The reason we don't use |
| 2566 | * an actual wait queue is because: |
| 2567 | * 1) we only ever have one waiter |
| 2568 | * 2) the tracing, traces all functions, we don't want |
| 2569 | * the overhead of calling wake_up and friends |
| 2570 | * (and tracing them too) |
| 2571 | * Anyway, this is really very primitive wakeup. |
| 2572 | */ |
| 2573 | set_current_state(TASK_INTERRUPTIBLE); |
| 2574 | iter->tr->waiter = current; |
| 2575 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2576 | mutex_unlock(&trace_types_lock); |
| 2577 | |
Ingo Molnar | 9fe068e | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2578 | /* sleep for 100 msecs, and try again. */ |
| 2579 | schedule_timeout(HZ/10); |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2580 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2581 | mutex_lock(&trace_types_lock); |
| 2582 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2583 | iter->tr->waiter = NULL; |
| 2584 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2585 | if (signal_pending(current)) { |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2586 | sret = -EINTR; |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2587 | goto out; |
| 2588 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2589 | |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2590 | if (iter->trace != current_trace) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2591 | goto out; |
Steven Rostedt | 8452799 | 2008-05-12 21:20:58 +0200 | [diff] [blame] | 2592 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2593 | /* |
| 2594 | * We block until we read something and tracing is disabled. |
| 2595 | * We still block if tracing is disabled, but we have never |
| 2596 | * read anything. This allows a user to cat this file, and |
| 2597 | * then enable tracing. But after we have read something, |
| 2598 | * we give an EOF when tracing is again disabled. |
| 2599 | * |
| 2600 | * iter->pos will be 0 if we haven't read anything. |
| 2601 | */ |
| 2602 | if (!tracer_enabled && iter->pos) |
| 2603 | break; |
| 2604 | |
| 2605 | continue; |
| 2606 | } |
| 2607 | |
| 2608 | /* stop when tracing is finished */ |
| 2609 | if (trace_empty(iter)) |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2610 | goto out; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2611 | |
| 2612 | if (cnt >= PAGE_SIZE) |
| 2613 | cnt = PAGE_SIZE - 1; |
| 2614 | |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2615 | /* reset all but tr, trace, and overruns */ |
Steven Rostedt | 53d0aa7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2616 | memset(&iter->seq, 0, |
| 2617 | sizeof(struct trace_iterator) - |
| 2618 | offsetof(struct trace_iterator, seq)); |
Steven Rostedt | 4823ed7 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2619 | iter->pos = -1; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2620 | |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2621 | while (find_next_entry_inc(iter) != NULL) { |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2622 | enum print_line_t ret; |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2623 | int len = iter->seq.len; |
| 2624 | |
Ingo Molnar | f9896bf | 2008-05-12 21:20:47 +0200 | [diff] [blame] | 2625 | ret = print_trace_line(iter); |
Frederic Weisbecker | 2c4f035 | 2008-09-29 20:18:34 +0200 | [diff] [blame] | 2626 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2627 | /* don't print partial lines */ |
| 2628 | iter->seq.len = len; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2629 | break; |
Steven Rostedt | 088b1e42 | 2008-05-12 21:20:48 +0200 | [diff] [blame] | 2630 | } |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2631 | |
| 2632 | trace_consume(iter); |
| 2633 | |
| 2634 | if (iter->seq.len >= cnt) |
| 2635 | break; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2636 | } |
| 2637 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2638 | /* Now copy what we have to the user */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2639 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
| 2640 | if (iter->seq.readpos >= iter->seq.len) |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2641 | trace_seq_reset(&iter->seq); |
Pekka Paalanen | 9ff4b97 | 2008-09-29 20:23:48 +0200 | [diff] [blame] | 2642 | |
| 2643 | /* |
| 2644 | * If there was nothing to send to user, inspite of consuming trace |
| 2645 | * entries, go back to wait for more entries. |
| 2646 | */ |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2647 | if (sret == -EBUSY) |
Pekka Paalanen | 9ff4b97 | 2008-09-29 20:23:48 +0200 | [diff] [blame] | 2648 | goto waitagain; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2649 | |
Steven Rostedt | 107bad8 | 2008-05-12 21:21:01 +0200 | [diff] [blame] | 2650 | out: |
| 2651 | mutex_unlock(&trace_types_lock); |
| 2652 | |
Pekka Paalanen | 6c6c279 | 2008-05-12 21:21:02 +0200 | [diff] [blame] | 2653 | return sret; |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2654 | } |
| 2655 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2656 | static ssize_t |
| 2657 | tracing_entries_read(struct file *filp, char __user *ubuf, |
| 2658 | size_t cnt, loff_t *ppos) |
| 2659 | { |
| 2660 | struct trace_array *tr = filp->private_data; |
| 2661 | char buf[64]; |
| 2662 | int r; |
| 2663 | |
| 2664 | r = sprintf(buf, "%lu\n", tr->entries); |
| 2665 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
| 2666 | } |
| 2667 | |
| 2668 | static ssize_t |
| 2669 | tracing_entries_write(struct file *filp, const char __user *ubuf, |
| 2670 | size_t cnt, loff_t *ppos) |
| 2671 | { |
| 2672 | unsigned long val; |
| 2673 | char buf[64]; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2674 | int ret; |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2675 | struct trace_array *tr = filp->private_data; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2676 | |
Steven Rostedt | cffae43 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2677 | if (cnt >= sizeof(buf)) |
| 2678 | return -EINVAL; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2679 | |
| 2680 | if (copy_from_user(&buf, ubuf, cnt)) |
| 2681 | return -EFAULT; |
| 2682 | |
| 2683 | buf[cnt] = 0; |
| 2684 | |
Steven Rostedt | c6caeeb | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 2685 | ret = strict_strtoul(buf, 10, &val); |
| 2686 | if (ret < 0) |
| 2687 | return ret; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2688 | |
| 2689 | /* must have at least 1 entry */ |
| 2690 | if (!val) |
| 2691 | return -EINVAL; |
| 2692 | |
| 2693 | mutex_lock(&trace_types_lock); |
| 2694 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2695 | if (tr->ctrl) { |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2696 | cnt = -EBUSY; |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2697 | pr_info("ftrace: please disable tracing" |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2698 | " before modifying buffer size\n"); |
| 2699 | goto out; |
| 2700 | } |
| 2701 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2702 | if (val != global_trace.entries) { |
| 2703 | ret = ring_buffer_resize(global_trace.buffer, val); |
| 2704 | if (ret < 0) { |
| 2705 | cnt = ret; |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2706 | goto out; |
| 2707 | } |
| 2708 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2709 | ret = ring_buffer_resize(max_tr.buffer, val); |
| 2710 | if (ret < 0) { |
| 2711 | int r; |
| 2712 | cnt = ret; |
| 2713 | r = ring_buffer_resize(global_trace.buffer, |
| 2714 | global_trace.entries); |
| 2715 | if (r < 0) { |
| 2716 | /* AARGH! We are left with different |
| 2717 | * size max buffer!!!! */ |
| 2718 | WARN_ON(1); |
| 2719 | tracing_disabled = 1; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2720 | } |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2721 | goto out; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2722 | } |
Steven Rostedt | 3eefae9 | 2008-05-12 21:21:04 +0200 | [diff] [blame] | 2723 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2724 | global_trace.entries = val; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2725 | } |
| 2726 | |
| 2727 | filp->f_pos += cnt; |
| 2728 | |
Steven Rostedt | 19384c0 | 2008-05-22 00:22:16 -0400 | [diff] [blame] | 2729 | /* If check pages failed, return ENOMEM */ |
| 2730 | if (tracing_disabled) |
| 2731 | cnt = -ENOMEM; |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2732 | out: |
| 2733 | max_tr.entries = global_trace.entries; |
| 2734 | mutex_unlock(&trace_types_lock); |
| 2735 | |
| 2736 | return cnt; |
| 2737 | } |
| 2738 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2739 | static int mark_printk(const char *fmt, ...) |
| 2740 | { |
| 2741 | int ret; |
| 2742 | va_list args; |
| 2743 | va_start(args, fmt); |
| 2744 | ret = trace_vprintk(0, fmt, args); |
| 2745 | va_end(args); |
| 2746 | return ret; |
| 2747 | } |
| 2748 | |
| 2749 | static ssize_t |
| 2750 | tracing_mark_write(struct file *filp, const char __user *ubuf, |
| 2751 | size_t cnt, loff_t *fpos) |
| 2752 | { |
| 2753 | char *buf; |
| 2754 | char *end; |
| 2755 | struct trace_array *tr = &global_trace; |
| 2756 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2757 | if (!tr->ctrl || tracing_disabled) |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2758 | return -EINVAL; |
| 2759 | |
| 2760 | if (cnt > TRACE_BUF_SIZE) |
| 2761 | cnt = TRACE_BUF_SIZE; |
| 2762 | |
| 2763 | buf = kmalloc(cnt + 1, GFP_KERNEL); |
| 2764 | if (buf == NULL) |
| 2765 | return -ENOMEM; |
| 2766 | |
| 2767 | if (copy_from_user(buf, ubuf, cnt)) { |
| 2768 | kfree(buf); |
| 2769 | return -EFAULT; |
| 2770 | } |
| 2771 | |
| 2772 | /* Cut from the first nil or newline. */ |
| 2773 | buf[cnt] = '\0'; |
| 2774 | end = strchr(buf, '\n'); |
| 2775 | if (end) |
| 2776 | *end = '\0'; |
| 2777 | |
| 2778 | cnt = mark_printk("%s\n", buf); |
| 2779 | kfree(buf); |
| 2780 | *fpos += cnt; |
| 2781 | |
| 2782 | return cnt; |
| 2783 | } |
| 2784 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2785 | static struct file_operations tracing_max_lat_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2786 | .open = tracing_open_generic, |
| 2787 | .read = tracing_max_lat_read, |
| 2788 | .write = tracing_max_lat_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2789 | }; |
| 2790 | |
| 2791 | static struct file_operations tracing_ctrl_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2792 | .open = tracing_open_generic, |
| 2793 | .read = tracing_ctrl_read, |
| 2794 | .write = tracing_ctrl_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2795 | }; |
| 2796 | |
| 2797 | static struct file_operations set_tracer_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2798 | .open = tracing_open_generic, |
| 2799 | .read = tracing_set_trace_read, |
| 2800 | .write = tracing_set_trace_write, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2801 | }; |
| 2802 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2803 | static struct file_operations tracing_pipe_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2804 | .open = tracing_open_pipe, |
Soeren Sandmann Pedersen | 2a2cc8f | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2805 | .poll = tracing_poll_pipe, |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2806 | .read = tracing_read_pipe, |
| 2807 | .release = tracing_release_pipe, |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2808 | }; |
| 2809 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2810 | static struct file_operations tracing_entries_fops = { |
| 2811 | .open = tracing_open_generic, |
| 2812 | .read = tracing_entries_read, |
| 2813 | .write = tracing_entries_write, |
| 2814 | }; |
| 2815 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2816 | static struct file_operations tracing_mark_fops = { |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2817 | .open = tracing_open_generic, |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2818 | .write = tracing_mark_write, |
| 2819 | }; |
| 2820 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2821 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2822 | |
| 2823 | static ssize_t |
| 2824 | tracing_read_long(struct file *filp, char __user *ubuf, |
| 2825 | size_t cnt, loff_t *ppos) |
| 2826 | { |
| 2827 | unsigned long *p = filp->private_data; |
| 2828 | char buf[64]; |
| 2829 | int r; |
| 2830 | |
| 2831 | r = sprintf(buf, "%ld\n", *p); |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2832 | |
| 2833 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2834 | } |
| 2835 | |
| 2836 | static struct file_operations tracing_read_long_fops = { |
Ingo Molnar | 4bf39a9 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2837 | .open = tracing_open_generic, |
| 2838 | .read = tracing_read_long, |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2839 | }; |
| 2840 | #endif |
| 2841 | |
| 2842 | static struct dentry *d_tracer; |
| 2843 | |
| 2844 | struct dentry *tracing_init_dentry(void) |
| 2845 | { |
| 2846 | static int once; |
| 2847 | |
| 2848 | if (d_tracer) |
| 2849 | return d_tracer; |
| 2850 | |
| 2851 | d_tracer = debugfs_create_dir("tracing", NULL); |
| 2852 | |
| 2853 | if (!d_tracer && !once) { |
| 2854 | once = 1; |
| 2855 | pr_warning("Could not create debugfs directory 'tracing'\n"); |
| 2856 | return NULL; |
| 2857 | } |
| 2858 | |
| 2859 | return d_tracer; |
| 2860 | } |
| 2861 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 2862 | #ifdef CONFIG_FTRACE_SELFTEST |
| 2863 | /* Let selftest have access to static functions in this file */ |
| 2864 | #include "trace_selftest.c" |
| 2865 | #endif |
| 2866 | |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 2867 | static __init int tracer_init_debugfs(void) |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2868 | { |
| 2869 | struct dentry *d_tracer; |
| 2870 | struct dentry *entry; |
| 2871 | |
| 2872 | d_tracer = tracing_init_dentry(); |
| 2873 | |
| 2874 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, |
| 2875 | &global_trace, &tracing_ctrl_fops); |
| 2876 | if (!entry) |
| 2877 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); |
| 2878 | |
| 2879 | entry = debugfs_create_file("iter_ctrl", 0644, d_tracer, |
| 2880 | NULL, &tracing_iter_fops); |
| 2881 | if (!entry) |
| 2882 | pr_warning("Could not create debugfs 'iter_ctrl' entry\n"); |
| 2883 | |
Ingo Molnar | c7078de | 2008-05-12 21:20:52 +0200 | [diff] [blame] | 2884 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
| 2885 | NULL, &tracing_cpumask_fops); |
| 2886 | if (!entry) |
| 2887 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); |
| 2888 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2889 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
| 2890 | &global_trace, &tracing_lt_fops); |
| 2891 | if (!entry) |
| 2892 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); |
| 2893 | |
| 2894 | entry = debugfs_create_file("trace", 0444, d_tracer, |
| 2895 | &global_trace, &tracing_fops); |
| 2896 | if (!entry) |
| 2897 | pr_warning("Could not create debugfs 'trace' entry\n"); |
| 2898 | |
| 2899 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, |
| 2900 | &global_trace, &show_traces_fops); |
| 2901 | if (!entry) |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 2902 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2903 | |
| 2904 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, |
| 2905 | &global_trace, &set_tracer_fops); |
| 2906 | if (!entry) |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 2907 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2908 | |
| 2909 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, |
| 2910 | &tracing_max_latency, |
| 2911 | &tracing_max_lat_fops); |
| 2912 | if (!entry) |
| 2913 | pr_warning("Could not create debugfs " |
| 2914 | "'tracing_max_latency' entry\n"); |
| 2915 | |
| 2916 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, |
| 2917 | &tracing_thresh, &tracing_max_lat_fops); |
| 2918 | if (!entry) |
| 2919 | pr_warning("Could not create debugfs " |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 2920 | "'tracing_thresh' entry\n"); |
Ingo Molnar | 7bd2f24 | 2008-05-12 21:20:45 +0200 | [diff] [blame] | 2921 | entry = debugfs_create_file("README", 0644, d_tracer, |
| 2922 | NULL, &tracing_readme_fops); |
| 2923 | if (!entry) |
| 2924 | pr_warning("Could not create debugfs 'README' entry\n"); |
| 2925 | |
Steven Rostedt | b3806b4 | 2008-05-12 21:20:46 +0200 | [diff] [blame] | 2926 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
| 2927 | NULL, &tracing_pipe_fops); |
| 2928 | if (!entry) |
| 2929 | pr_warning("Could not create debugfs " |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 2930 | "'trace_pipe' entry\n"); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2931 | |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2932 | entry = debugfs_create_file("trace_entries", 0644, d_tracer, |
| 2933 | &global_trace, &tracing_entries_fops); |
| 2934 | if (!entry) |
| 2935 | pr_warning("Could not create debugfs " |
Frédéric Weisbecker | 98a983a | 2008-08-15 21:08:22 +0200 | [diff] [blame] | 2936 | "'trace_entries' entry\n"); |
Steven Rostedt | a98a3c3 | 2008-05-12 21:20:59 +0200 | [diff] [blame] | 2937 | |
Pekka Paalanen | 5bf9a1e | 2008-09-16 22:06:42 +0300 | [diff] [blame] | 2938 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
| 2939 | NULL, &tracing_mark_fops); |
| 2940 | if (!entry) |
| 2941 | pr_warning("Could not create debugfs " |
| 2942 | "'trace_marker' entry\n"); |
| 2943 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2944 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 2945 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, |
| 2946 | &ftrace_update_tot_cnt, |
| 2947 | &tracing_read_long_fops); |
| 2948 | if (!entry) |
| 2949 | pr_warning("Could not create debugfs " |
| 2950 | "'dyn_ftrace_total_info' entry\n"); |
| 2951 | #endif |
Ingo Molnar | d618b3e | 2008-05-12 21:20:49 +0200 | [diff] [blame] | 2952 | #ifdef CONFIG_SYSPROF_TRACER |
| 2953 | init_tracer_sysprof_debugfs(d_tracer); |
| 2954 | #endif |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 2955 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 2956 | } |
| 2957 | |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 2958 | int trace_vprintk(unsigned long ip, const char *fmt, va_list args) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2959 | { |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2960 | static DEFINE_SPINLOCK(trace_buf_lock); |
| 2961 | static char trace_buf[TRACE_BUF_SIZE]; |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 2962 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2963 | struct ring_buffer_event *event; |
Peter Zijlstra | f09ce57 | 2008-09-04 10:24:14 +0200 | [diff] [blame] | 2964 | struct trace_array *tr = &global_trace; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2965 | struct trace_array_cpu *data; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2966 | struct print_entry *entry; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2967 | unsigned long flags, irq_flags; |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 2968 | int cpu, len = 0, size, pc; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2969 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 2970 | if (!tr->ctrl || tracing_disabled) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2971 | return 0; |
| 2972 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 2973 | pc = preempt_count(); |
| 2974 | preempt_disable_notrace(); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2975 | cpu = raw_smp_processor_id(); |
| 2976 | data = tr->data[cpu]; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2977 | |
Steven Rostedt | 3ea2e6d | 2008-10-04 02:01:00 -0400 | [diff] [blame] | 2978 | if (unlikely(atomic_read(&data->disabled))) |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2979 | goto out; |
| 2980 | |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 2981 | spin_lock_irqsave(&trace_buf_lock, flags); |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 2982 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2983 | |
| 2984 | len = min(len, TRACE_BUF_SIZE-1); |
| 2985 | trace_buf[len] = 0; |
| 2986 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2987 | size = sizeof(*entry) + len + 1; |
| 2988 | event = ring_buffer_lock_reserve(tr->buffer, size, &irq_flags); |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2989 | if (!event) |
| 2990 | goto out_unlock; |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2991 | entry = ring_buffer_event_data(event); |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 2992 | tracing_generic_entry_update(&entry->ent, flags, pc); |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2993 | entry->ent.type = TRACE_PRINT; |
| 2994 | entry->ip = ip; |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2995 | |
Steven Rostedt | 777e208 | 2008-09-29 23:02:42 -0400 | [diff] [blame] | 2996 | memcpy(&entry->buf, trace_buf, len); |
| 2997 | entry->buf[len] = 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 2998 | ring_buffer_unlock_commit(tr->buffer, event, irq_flags); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 2999 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3000 | out_unlock: |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3001 | spin_unlock_irqrestore(&trace_buf_lock, flags); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3002 | |
| 3003 | out: |
Steven Rostedt | 3869705 | 2008-10-01 13:14:09 -0400 | [diff] [blame] | 3004 | preempt_enable_notrace(); |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3005 | |
| 3006 | return len; |
| 3007 | } |
Pekka Paalanen | 801fe40 | 2008-09-16 21:58:24 +0300 | [diff] [blame] | 3008 | EXPORT_SYMBOL_GPL(trace_vprintk); |
| 3009 | |
| 3010 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) |
| 3011 | { |
| 3012 | int ret; |
| 3013 | va_list ap; |
| 3014 | |
| 3015 | if (!(trace_flags & TRACE_ITER_PRINTK)) |
| 3016 | return 0; |
| 3017 | |
| 3018 | va_start(ap, fmt); |
| 3019 | ret = trace_vprintk(ip, fmt, ap); |
| 3020 | va_end(ap); |
| 3021 | return ret; |
| 3022 | } |
Steven Rostedt | dd0e545 | 2008-08-01 12:26:41 -0400 | [diff] [blame] | 3023 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
| 3024 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3025 | static int trace_panic_handler(struct notifier_block *this, |
| 3026 | unsigned long event, void *unused) |
| 3027 | { |
| 3028 | ftrace_dump(); |
| 3029 | return NOTIFY_OK; |
| 3030 | } |
| 3031 | |
| 3032 | static struct notifier_block trace_panic_notifier = { |
| 3033 | .notifier_call = trace_panic_handler, |
| 3034 | .next = NULL, |
| 3035 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ |
| 3036 | }; |
| 3037 | |
| 3038 | static int trace_die_handler(struct notifier_block *self, |
| 3039 | unsigned long val, |
| 3040 | void *data) |
| 3041 | { |
| 3042 | switch (val) { |
| 3043 | case DIE_OOPS: |
| 3044 | ftrace_dump(); |
| 3045 | break; |
| 3046 | default: |
| 3047 | break; |
| 3048 | } |
| 3049 | return NOTIFY_OK; |
| 3050 | } |
| 3051 | |
| 3052 | static struct notifier_block trace_die_notifier = { |
| 3053 | .notifier_call = trace_die_handler, |
| 3054 | .priority = 200 |
| 3055 | }; |
| 3056 | |
| 3057 | /* |
| 3058 | * printk is set to max of 1024, we really don't need it that big. |
| 3059 | * Nothing should be printing 1000 characters anyway. |
| 3060 | */ |
| 3061 | #define TRACE_MAX_PRINT 1000 |
| 3062 | |
| 3063 | /* |
| 3064 | * Define here KERN_TRACE so that we have one place to modify |
| 3065 | * it if we decide to change what log level the ftrace dump |
| 3066 | * should be at. |
| 3067 | */ |
| 3068 | #define KERN_TRACE KERN_INFO |
| 3069 | |
| 3070 | static void |
| 3071 | trace_printk_seq(struct trace_seq *s) |
| 3072 | { |
| 3073 | /* Probably should print a warning here. */ |
| 3074 | if (s->len >= 1000) |
| 3075 | s->len = 1000; |
| 3076 | |
| 3077 | /* should be zero ended, but we are paranoid. */ |
| 3078 | s->buffer[s->len] = 0; |
| 3079 | |
| 3080 | printk(KERN_TRACE "%s", s->buffer); |
| 3081 | |
| 3082 | trace_seq_reset(s); |
| 3083 | } |
| 3084 | |
| 3085 | |
| 3086 | void ftrace_dump(void) |
| 3087 | { |
| 3088 | static DEFINE_SPINLOCK(ftrace_dump_lock); |
| 3089 | /* use static because iter can be a bit big for the stack */ |
| 3090 | static struct trace_iterator iter; |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3091 | static cpumask_t mask; |
| 3092 | static int dump_ran; |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 3093 | unsigned long flags; |
| 3094 | int cnt = 0, cpu; |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3095 | |
| 3096 | /* only one dump */ |
| 3097 | spin_lock_irqsave(&ftrace_dump_lock, flags); |
| 3098 | if (dump_ran) |
| 3099 | goto out; |
| 3100 | |
| 3101 | dump_ran = 1; |
| 3102 | |
| 3103 | /* No turning back! */ |
| 3104 | ftrace_kill_atomic(); |
| 3105 | |
Steven Rostedt | d769041 | 2008-10-01 00:29:53 -0400 | [diff] [blame] | 3106 | for_each_tracing_cpu(cpu) { |
| 3107 | atomic_inc(&global_trace.data[cpu]->disabled); |
| 3108 | } |
| 3109 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3110 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); |
| 3111 | |
| 3112 | iter.tr = &global_trace; |
| 3113 | iter.trace = current_trace; |
| 3114 | |
| 3115 | /* |
| 3116 | * We need to stop all tracing on all CPUS to read the |
| 3117 | * the next buffer. This is a bit expensive, but is |
| 3118 | * not done often. We fill all what we can read, |
| 3119 | * and then release the locks again. |
| 3120 | */ |
| 3121 | |
| 3122 | cpus_clear(mask); |
| 3123 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3124 | while (!trace_empty(&iter)) { |
| 3125 | |
| 3126 | if (!cnt) |
| 3127 | printk(KERN_TRACE "---------------------------------\n"); |
| 3128 | |
| 3129 | cnt++; |
| 3130 | |
| 3131 | /* reset all but tr, trace, and overruns */ |
| 3132 | memset(&iter.seq, 0, |
| 3133 | sizeof(struct trace_iterator) - |
| 3134 | offsetof(struct trace_iterator, seq)); |
| 3135 | iter.iter_flags |= TRACE_FILE_LAT_FMT; |
| 3136 | iter.pos = -1; |
| 3137 | |
| 3138 | if (find_next_entry_inc(&iter) != NULL) { |
| 3139 | print_trace_line(&iter); |
| 3140 | trace_consume(&iter); |
| 3141 | } |
| 3142 | |
| 3143 | trace_printk_seq(&iter.seq); |
| 3144 | } |
| 3145 | |
| 3146 | if (!cnt) |
| 3147 | printk(KERN_TRACE " (ftrace buffer empty)\n"); |
| 3148 | else |
| 3149 | printk(KERN_TRACE "---------------------------------\n"); |
| 3150 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3151 | out: |
| 3152 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); |
| 3153 | } |
| 3154 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3155 | __init static int tracer_alloc_buffers(void) |
| 3156 | { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3157 | struct trace_array_cpu *data; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3158 | int i; |
| 3159 | |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3160 | /* TODO: make the number of buffers hot pluggable with CPUS */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3161 | tracing_buffer_mask = cpu_possible_map; |
| 3162 | |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3163 | global_trace.buffer = ring_buffer_alloc(trace_buf_size, |
| 3164 | TRACE_BUFFER_FLAGS); |
| 3165 | if (!global_trace.buffer) { |
| 3166 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); |
| 3167 | WARN_ON(1); |
| 3168 | return 0; |
| 3169 | } |
| 3170 | global_trace.entries = ring_buffer_size(global_trace.buffer); |
| 3171 | |
| 3172 | #ifdef CONFIG_TRACER_MAX_TRACE |
| 3173 | max_tr.buffer = ring_buffer_alloc(trace_buf_size, |
| 3174 | TRACE_BUFFER_FLAGS); |
| 3175 | if (!max_tr.buffer) { |
| 3176 | printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); |
| 3177 | WARN_ON(1); |
| 3178 | ring_buffer_free(global_trace.buffer); |
| 3179 | return 0; |
| 3180 | } |
| 3181 | max_tr.entries = ring_buffer_size(max_tr.buffer); |
| 3182 | WARN_ON(max_tr.entries != global_trace.entries); |
| 3183 | #endif |
| 3184 | |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3185 | /* Allocate the first page for all buffers */ |
Steven Rostedt | ab46428 | 2008-05-12 21:21:00 +0200 | [diff] [blame] | 3186 | for_each_tracing_cpu(i) { |
Steven Rostedt | 4c11d7a | 2008-05-12 21:20:43 +0200 | [diff] [blame] | 3187 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3188 | max_tr.data[i] = &per_cpu(max_data, i); |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3189 | } |
| 3190 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3191 | trace_init_cmdlines(); |
| 3192 | |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 3193 | register_tracer(&nop_trace); |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3194 | #ifdef CONFIG_BOOT_TRACER |
| 3195 | register_tracer(&boot_tracer); |
| 3196 | current_trace = &boot_tracer; |
| 3197 | current_trace->init(&global_trace); |
| 3198 | #else |
Frédéric Weisbecker | 43a1538 | 2008-09-21 20:16:30 +0200 | [diff] [blame] | 3199 | current_trace = &nop_trace; |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3200 | #endif |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3201 | |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3202 | /* All seems OK, enable tracing */ |
Steven Rostedt | 4902f88 | 2008-05-22 00:22:18 -0400 | [diff] [blame] | 3203 | global_trace.ctrl = tracer_enabled; |
Steven Rostedt | 60a1177 | 2008-05-12 21:20:44 +0200 | [diff] [blame] | 3204 | tracing_disabled = 0; |
Steven Rostedt | 3928a8a | 2008-09-29 23:02:41 -0400 | [diff] [blame] | 3205 | |
Steven Rostedt | 3f5a54e | 2008-07-30 22:36:46 -0400 | [diff] [blame] | 3206 | atomic_notifier_chain_register(&panic_notifier_list, |
| 3207 | &trace_panic_notifier); |
| 3208 | |
| 3209 | register_die_notifier(&trace_die_notifier); |
| 3210 | |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3211 | return 0; |
Steven Rostedt | bc0c38d | 2008-05-12 21:20:42 +0200 | [diff] [blame] | 3212 | } |
Frédéric Weisbecker | b5ad384 | 2008-09-23 11:34:32 +0100 | [diff] [blame] | 3213 | early_initcall(tracer_alloc_buffers); |
| 3214 | fs_initcall(tracer_init_debugfs); |