Commit | Line | Data |
---|---|---|
bc0c38d1 SR |
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> | |
3f5a54e3 | 17 | #include <linux/notifier.h> |
bc0c38d1 | 18 | #include <linux/debugfs.h> |
4c11d7ae | 19 | #include <linux/pagemap.h> |
bc0c38d1 SR |
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> | |
3f5a54e3 | 26 | #include <linux/kdebug.h> |
bc0c38d1 SR |
27 | #include <linux/ctype.h> |
28 | #include <linux/init.h> | |
2a2cc8f7 | 29 | #include <linux/poll.h> |
bc0c38d1 SR |
30 | #include <linux/gfp.h> |
31 | #include <linux/fs.h> | |
76094a2c | 32 | #include <linux/kprobes.h> |
3eefae99 | 33 | #include <linux/writeback.h> |
bc0c38d1 | 34 | |
86387f7e | 35 | #include <linux/stacktrace.h> |
3928a8a2 | 36 | #include <linux/ring_buffer.h> |
21798a84 | 37 | #include <linux/irqflags.h> |
86387f7e | 38 | |
bc0c38d1 | 39 | #include "trace.h" |
f0868d1e | 40 | #include "trace_output.h" |
bc0c38d1 | 41 | |
3928a8a2 SR |
42 | #define TRACE_BUFFER_FLAGS (RB_FL_OVERWRITE) |
43 | ||
745b1626 | 44 | unsigned long __read_mostly tracing_max_latency; |
bc0c38d1 SR |
45 | unsigned long __read_mostly tracing_thresh; |
46 | ||
8e1b82e0 FW |
47 | /* |
48 | * We need to change this state when a selftest is running. | |
ff32504f FW |
49 | * A selftest will lurk into the ring-buffer to count the |
50 | * entries inserted during the selftest although some concurrent | |
51 | * insertions into the ring-buffer such as ftrace_printk could occurred | |
52 | * at the same time, giving false positive or negative results. | |
53 | */ | |
8e1b82e0 | 54 | static bool __read_mostly tracing_selftest_running; |
ff32504f | 55 | |
b2821ae6 SR |
56 | /* |
57 | * If a tracer is running, we do not want to run SELFTEST. | |
58 | */ | |
59 | static bool __read_mostly tracing_selftest_disabled; | |
60 | ||
adf9f195 FW |
61 | /* For tracers that don't implement custom flags */ |
62 | static struct tracer_opt dummy_tracer_opt[] = { | |
63 | { } | |
64 | }; | |
65 | ||
66 | static struct tracer_flags dummy_tracer_flags = { | |
67 | .val = 0, | |
68 | .opts = dummy_tracer_opt | |
69 | }; | |
70 | ||
71 | static int dummy_set_flag(u32 old_flags, u32 bit, int set) | |
72 | { | |
73 | return 0; | |
74 | } | |
0f048701 SR |
75 | |
76 | /* | |
77 | * Kill all tracing for good (never come back). | |
78 | * It is initialized to 1 but will turn to zero if the initialization | |
79 | * of the tracer is successful. But that is the only place that sets | |
80 | * this back to zero. | |
81 | */ | |
82 | int tracing_disabled = 1; | |
83 | ||
d769041f SR |
84 | static DEFINE_PER_CPU(local_t, ftrace_cpu_disabled); |
85 | ||
86 | static inline void ftrace_disable_cpu(void) | |
87 | { | |
88 | preempt_disable(); | |
89 | local_inc(&__get_cpu_var(ftrace_cpu_disabled)); | |
90 | } | |
91 | ||
92 | static inline void ftrace_enable_cpu(void) | |
93 | { | |
94 | local_dec(&__get_cpu_var(ftrace_cpu_disabled)); | |
95 | preempt_enable(); | |
96 | } | |
97 | ||
9e01c1b7 | 98 | static cpumask_var_t __read_mostly tracing_buffer_mask; |
ab46428c SR |
99 | |
100 | #define for_each_tracing_cpu(cpu) \ | |
9e01c1b7 | 101 | for_each_cpu(cpu, tracing_buffer_mask) |
ab46428c | 102 | |
944ac425 SR |
103 | /* |
104 | * ftrace_dump_on_oops - variable to dump ftrace buffer on oops | |
105 | * | |
106 | * If there is an oops (or kernel panic) and the ftrace_dump_on_oops | |
107 | * is set, then ftrace_dump is called. This will output the contents | |
108 | * of the ftrace buffers to the console. This is very useful for | |
109 | * capturing traces that lead to crashes and outputing it to a | |
110 | * serial console. | |
111 | * | |
112 | * It is default off, but you can enable it with either specifying | |
113 | * "ftrace_dump_on_oops" in the kernel command line, or setting | |
114 | * /proc/sys/kernel/ftrace_dump_on_oops to true. | |
115 | */ | |
116 | int ftrace_dump_on_oops; | |
117 | ||
b2821ae6 SR |
118 | static int tracing_set_tracer(const char *buf); |
119 | ||
120 | #define BOOTUP_TRACER_SIZE 100 | |
121 | static char bootup_tracer_buf[BOOTUP_TRACER_SIZE] __initdata; | |
122 | static char *default_bootup_tracer; | |
d9e54076 PZ |
123 | |
124 | static int __init set_ftrace(char *str) | |
125 | { | |
b2821ae6 SR |
126 | strncpy(bootup_tracer_buf, str, BOOTUP_TRACER_SIZE); |
127 | default_bootup_tracer = bootup_tracer_buf; | |
d9e54076 PZ |
128 | return 1; |
129 | } | |
b2821ae6 | 130 | __setup("ftrace=", set_ftrace); |
d9e54076 | 131 | |
944ac425 SR |
132 | static int __init set_ftrace_dump_on_oops(char *str) |
133 | { | |
134 | ftrace_dump_on_oops = 1; | |
135 | return 1; | |
136 | } | |
137 | __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops); | |
60a11774 | 138 | |
72829bc3 | 139 | long |
bc0c38d1 SR |
140 | ns2usecs(cycle_t nsec) |
141 | { | |
142 | nsec += 500; | |
143 | do_div(nsec, 1000); | |
144 | return nsec; | |
145 | } | |
146 | ||
e309b41d | 147 | cycle_t ftrace_now(int cpu) |
750ed1a4 | 148 | { |
3928a8a2 SR |
149 | u64 ts = ring_buffer_time_stamp(cpu); |
150 | ring_buffer_normalize_time_stamp(cpu, &ts); | |
151 | return ts; | |
750ed1a4 IM |
152 | } |
153 | ||
4fcdae83 SR |
154 | /* |
155 | * The global_trace is the descriptor that holds the tracing | |
156 | * buffers for the live tracing. For each CPU, it contains | |
157 | * a link list of pages that will store trace entries. The | |
158 | * page descriptor of the pages in the memory is used to hold | |
159 | * the link list by linking the lru item in the page descriptor | |
160 | * to each of the pages in the buffer per CPU. | |
161 | * | |
162 | * For each active CPU there is a data field that holds the | |
163 | * pages for the buffer for that CPU. Each CPU has the same number | |
164 | * of pages allocated for its buffer. | |
165 | */ | |
bc0c38d1 SR |
166 | static struct trace_array global_trace; |
167 | ||
168 | static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu); | |
169 | ||
4fcdae83 SR |
170 | /* |
171 | * The max_tr is used to snapshot the global_trace when a maximum | |
172 | * latency is reached. Some tracers will use this to store a maximum | |
173 | * trace while it continues examining live traces. | |
174 | * | |
175 | * The buffers for the max_tr are set up the same as the global_trace. | |
176 | * When a snapshot is taken, the link list of the max_tr is swapped | |
177 | * with the link list of the global_trace and the buffers are reset for | |
178 | * the global_trace so the tracing can continue. | |
179 | */ | |
bc0c38d1 SR |
180 | static struct trace_array max_tr; |
181 | ||
182 | static DEFINE_PER_CPU(struct trace_array_cpu, max_data); | |
183 | ||
4fcdae83 | 184 | /* tracer_enabled is used to toggle activation of a tracer */ |
26994ead | 185 | static int tracer_enabled = 1; |
4fcdae83 | 186 | |
9036990d SR |
187 | /** |
188 | * tracing_is_enabled - return tracer_enabled status | |
189 | * | |
190 | * This function is used by other tracers to know the status | |
191 | * of the tracer_enabled flag. Tracers may use this function | |
192 | * to know if it should enable their features when starting | |
193 | * up. See irqsoff tracer for an example (start_irqsoff_tracer). | |
194 | */ | |
195 | int tracing_is_enabled(void) | |
196 | { | |
197 | return tracer_enabled; | |
198 | } | |
199 | ||
4fcdae83 | 200 | /* |
3928a8a2 SR |
201 | * trace_buf_size is the size in bytes that is allocated |
202 | * for a buffer. Note, the number of bytes is always rounded | |
203 | * to page size. | |
3f5a54e3 SR |
204 | * |
205 | * This number is purposely set to a low number of 16384. | |
206 | * If the dump on oops happens, it will be much appreciated | |
207 | * to not have to wait for all that output. Anyway this can be | |
208 | * boot time and run time configurable. | |
4fcdae83 | 209 | */ |
3928a8a2 | 210 | #define TRACE_BUF_SIZE_DEFAULT 1441792UL /* 16384 * 88 (sizeof(entry)) */ |
3f5a54e3 | 211 | |
3928a8a2 | 212 | static unsigned long trace_buf_size = TRACE_BUF_SIZE_DEFAULT; |
bc0c38d1 | 213 | |
4fcdae83 | 214 | /* trace_types holds a link list of available tracers. */ |
bc0c38d1 | 215 | static struct tracer *trace_types __read_mostly; |
4fcdae83 SR |
216 | |
217 | /* current_trace points to the tracer that is currently active */ | |
bc0c38d1 | 218 | static struct tracer *current_trace __read_mostly; |
4fcdae83 SR |
219 | |
220 | /* | |
221 | * max_tracer_type_len is used to simplify the allocating of | |
222 | * buffers to read userspace tracer names. We keep track of | |
223 | * the longest tracer name registered. | |
224 | */ | |
bc0c38d1 SR |
225 | static int max_tracer_type_len; |
226 | ||
4fcdae83 SR |
227 | /* |
228 | * trace_types_lock is used to protect the trace_types list. | |
229 | * This lock is also used to keep user access serialized. | |
230 | * Accesses from userspace will grab this lock while userspace | |
231 | * activities happen inside the kernel. | |
232 | */ | |
bc0c38d1 | 233 | static DEFINE_MUTEX(trace_types_lock); |
4fcdae83 SR |
234 | |
235 | /* trace_wait is a waitqueue for tasks blocked on trace_poll */ | |
4e655519 IM |
236 | static DECLARE_WAIT_QUEUE_HEAD(trace_wait); |
237 | ||
ee6bce52 | 238 | /* trace_flags holds trace_options default values */ |
12ef7d44 | 239 | unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK | |
c4a8e8be | 240 | TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO; |
4e655519 | 241 | |
4fcdae83 SR |
242 | /** |
243 | * trace_wake_up - wake up tasks waiting for trace input | |
244 | * | |
245 | * Simply wakes up any task that is blocked on the trace_wait | |
246 | * queue. These is used with trace_poll for tasks polling the trace. | |
247 | */ | |
4e655519 IM |
248 | void trace_wake_up(void) |
249 | { | |
017730c1 IM |
250 | /* |
251 | * The runqueue_is_locked() can fail, but this is the best we | |
252 | * have for now: | |
253 | */ | |
254 | if (!(trace_flags & TRACE_ITER_BLOCK) && !runqueue_is_locked()) | |
4e655519 IM |
255 | wake_up(&trace_wait); |
256 | } | |
bc0c38d1 | 257 | |
3928a8a2 | 258 | static int __init set_buf_size(char *str) |
bc0c38d1 | 259 | { |
3928a8a2 | 260 | unsigned long buf_size; |
c6caeeb1 SR |
261 | int ret; |
262 | ||
bc0c38d1 SR |
263 | if (!str) |
264 | return 0; | |
3928a8a2 | 265 | ret = strict_strtoul(str, 0, &buf_size); |
c6caeeb1 | 266 | /* nr_entries can not be zero */ |
3928a8a2 | 267 | if (ret < 0 || buf_size == 0) |
c6caeeb1 | 268 | return 0; |
3928a8a2 | 269 | trace_buf_size = buf_size; |
bc0c38d1 SR |
270 | return 1; |
271 | } | |
3928a8a2 | 272 | __setup("trace_buf_size=", set_buf_size); |
bc0c38d1 | 273 | |
57f50be1 SR |
274 | unsigned long nsecs_to_usecs(unsigned long nsecs) |
275 | { | |
276 | return nsecs / 1000; | |
277 | } | |
278 | ||
4fcdae83 | 279 | /* These must match the bit postions in trace_iterator_flags */ |
bc0c38d1 SR |
280 | static const char *trace_options[] = { |
281 | "print-parent", | |
282 | "sym-offset", | |
283 | "sym-addr", | |
284 | "verbose", | |
f9896bf3 | 285 | "raw", |
5e3ca0ec | 286 | "hex", |
cb0f12aa | 287 | "bin", |
2a2cc8f7 | 288 | "block", |
86387f7e | 289 | "stacktrace", |
4ac3ba41 | 290 | "sched-tree", |
f09ce573 | 291 | "ftrace_printk", |
b2a866f9 | 292 | "ftrace_preempt", |
9f029e83 | 293 | "branch", |
12ef7d44 | 294 | "annotate", |
02b67518 | 295 | "userstacktrace", |
b54d3de9 | 296 | "sym-userobj", |
66896a85 | 297 | "printk-msg-only", |
c4a8e8be | 298 | "context-info", |
bc0c38d1 SR |
299 | NULL |
300 | }; | |
301 | ||
4fcdae83 SR |
302 | /* |
303 | * ftrace_max_lock is used to protect the swapping of buffers | |
304 | * when taking a max snapshot. The buffers themselves are | |
305 | * protected by per_cpu spinlocks. But the action of the swap | |
306 | * needs its own lock. | |
307 | * | |
308 | * This is defined as a raw_spinlock_t in order to help | |
309 | * with performance when lockdep debugging is enabled. | |
310 | */ | |
92205c23 SR |
311 | static raw_spinlock_t ftrace_max_lock = |
312 | (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED; | |
bc0c38d1 SR |
313 | |
314 | /* | |
315 | * Copy the new maximum trace into the separate maximum-trace | |
316 | * structure. (this way the maximum trace is permanently saved, | |
317 | * for later retrieval via /debugfs/tracing/latency_trace) | |
318 | */ | |
e309b41d | 319 | static void |
bc0c38d1 SR |
320 | __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
321 | { | |
322 | struct trace_array_cpu *data = tr->data[cpu]; | |
323 | ||
324 | max_tr.cpu = cpu; | |
325 | max_tr.time_start = data->preempt_timestamp; | |
326 | ||
327 | data = max_tr.data[cpu]; | |
328 | data->saved_latency = tracing_max_latency; | |
329 | ||
330 | memcpy(data->comm, tsk->comm, TASK_COMM_LEN); | |
331 | data->pid = tsk->pid; | |
b6dff3ec | 332 | data->uid = task_uid(tsk); |
bc0c38d1 SR |
333 | data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; |
334 | data->policy = tsk->policy; | |
335 | data->rt_priority = tsk->rt_priority; | |
336 | ||
337 | /* record this tasks comm */ | |
338 | tracing_record_cmdline(current); | |
339 | } | |
340 | ||
e309b41d | 341 | static void |
214023c3 SR |
342 | trace_seq_reset(struct trace_seq *s) |
343 | { | |
344 | s->len = 0; | |
6c6c2796 PP |
345 | s->readpos = 0; |
346 | } | |
347 | ||
348 | ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt) | |
349 | { | |
350 | int len; | |
351 | int ret; | |
352 | ||
353 | if (s->len <= s->readpos) | |
354 | return -EBUSY; | |
355 | ||
356 | len = s->len - s->readpos; | |
357 | if (cnt > len) | |
358 | cnt = len; | |
359 | ret = copy_to_user(ubuf, s->buffer + s->readpos, cnt); | |
360 | if (ret) | |
361 | return -EFAULT; | |
362 | ||
363 | s->readpos += len; | |
364 | return cnt; | |
214023c3 SR |
365 | } |
366 | ||
e309b41d | 367 | static void |
214023c3 SR |
368 | trace_print_seq(struct seq_file *m, struct trace_seq *s) |
369 | { | |
370 | int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; | |
371 | ||
372 | s->buffer[len] = 0; | |
373 | seq_puts(m, s->buffer); | |
374 | ||
375 | trace_seq_reset(s); | |
376 | } | |
377 | ||
4fcdae83 SR |
378 | /** |
379 | * update_max_tr - snapshot all trace buffers from global_trace to max_tr | |
380 | * @tr: tracer | |
381 | * @tsk: the task with the latency | |
382 | * @cpu: The cpu that initiated the trace. | |
383 | * | |
384 | * Flip the buffers between the @tr and the max_tr and record information | |
385 | * about which task was the cause of this latency. | |
386 | */ | |
e309b41d | 387 | void |
bc0c38d1 SR |
388 | update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu) |
389 | { | |
3928a8a2 | 390 | struct ring_buffer *buf = tr->buffer; |
bc0c38d1 | 391 | |
4c11d7ae | 392 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 393 | __raw_spin_lock(&ftrace_max_lock); |
3928a8a2 SR |
394 | |
395 | tr->buffer = max_tr.buffer; | |
396 | max_tr.buffer = buf; | |
397 | ||
d769041f | 398 | ftrace_disable_cpu(); |
3928a8a2 | 399 | ring_buffer_reset(tr->buffer); |
d769041f | 400 | ftrace_enable_cpu(); |
bc0c38d1 SR |
401 | |
402 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 403 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
404 | } |
405 | ||
406 | /** | |
407 | * update_max_tr_single - only copy one trace over, and reset the rest | |
408 | * @tr - tracer | |
409 | * @tsk - task with the latency | |
410 | * @cpu - the cpu of the buffer to copy. | |
4fcdae83 SR |
411 | * |
412 | * Flip the trace of a single CPU buffer between the @tr and the max_tr. | |
bc0c38d1 | 413 | */ |
e309b41d | 414 | void |
bc0c38d1 SR |
415 | update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu) |
416 | { | |
3928a8a2 | 417 | int ret; |
bc0c38d1 | 418 | |
4c11d7ae | 419 | WARN_ON_ONCE(!irqs_disabled()); |
92205c23 | 420 | __raw_spin_lock(&ftrace_max_lock); |
bc0c38d1 | 421 | |
d769041f SR |
422 | ftrace_disable_cpu(); |
423 | ||
3928a8a2 SR |
424 | ring_buffer_reset(max_tr.buffer); |
425 | ret = ring_buffer_swap_cpu(max_tr.buffer, tr->buffer, cpu); | |
426 | ||
d769041f SR |
427 | ftrace_enable_cpu(); |
428 | ||
97b17efe | 429 | WARN_ON_ONCE(ret && ret != -EAGAIN); |
bc0c38d1 SR |
430 | |
431 | __update_max_tr(tr, tsk, cpu); | |
92205c23 | 432 | __raw_spin_unlock(&ftrace_max_lock); |
bc0c38d1 SR |
433 | } |
434 | ||
4fcdae83 SR |
435 | /** |
436 | * register_tracer - register a tracer with the ftrace system. | |
437 | * @type - the plugin for the tracer | |
438 | * | |
439 | * Register a new plugin tracer. | |
440 | */ | |
bc0c38d1 SR |
441 | int register_tracer(struct tracer *type) |
442 | { | |
443 | struct tracer *t; | |
444 | int len; | |
445 | int ret = 0; | |
446 | ||
447 | if (!type->name) { | |
448 | pr_info("Tracer must have a name\n"); | |
449 | return -1; | |
450 | } | |
451 | ||
86fa2f60 IM |
452 | /* |
453 | * When this gets called we hold the BKL which means that | |
454 | * preemption is disabled. Various trace selftests however | |
455 | * need to disable and enable preemption for successful tests. | |
456 | * So we drop the BKL here and grab it after the tests again. | |
457 | */ | |
458 | unlock_kernel(); | |
bc0c38d1 | 459 | mutex_lock(&trace_types_lock); |
86fa2f60 | 460 | |
8e1b82e0 FW |
461 | tracing_selftest_running = true; |
462 | ||
bc0c38d1 SR |
463 | for (t = trace_types; t; t = t->next) { |
464 | if (strcmp(type->name, t->name) == 0) { | |
465 | /* already found */ | |
466 | pr_info("Trace %s already registered\n", | |
467 | type->name); | |
468 | ret = -1; | |
469 | goto out; | |
470 | } | |
471 | } | |
472 | ||
adf9f195 FW |
473 | if (!type->set_flag) |
474 | type->set_flag = &dummy_set_flag; | |
475 | if (!type->flags) | |
476 | type->flags = &dummy_tracer_flags; | |
477 | else | |
478 | if (!type->flags->opts) | |
479 | type->flags->opts = dummy_tracer_opt; | |
480 | ||
60a11774 | 481 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
b2821ae6 | 482 | if (type->selftest && !tracing_selftest_disabled) { |
60a11774 | 483 | struct tracer *saved_tracer = current_trace; |
60a11774 | 484 | struct trace_array *tr = &global_trace; |
60a11774 | 485 | int i; |
ff32504f | 486 | |
60a11774 SR |
487 | /* |
488 | * Run a selftest on this tracer. | |
489 | * Here we reset the trace buffer, and set the current | |
490 | * tracer to be this tracer. The tracer can then run some | |
491 | * internal tracing to verify that everything is in order. | |
492 | * If we fail, we do not register this tracer. | |
493 | */ | |
86fa2f60 | 494 | for_each_tracing_cpu(i) |
3928a8a2 | 495 | tracing_reset(tr, i); |
86fa2f60 | 496 | |
60a11774 | 497 | current_trace = type; |
60a11774 SR |
498 | /* the test is responsible for initializing and enabling */ |
499 | pr_info("Testing tracer %s: ", type->name); | |
500 | ret = type->selftest(type, tr); | |
501 | /* the test is responsible for resetting too */ | |
502 | current_trace = saved_tracer; | |
60a11774 SR |
503 | if (ret) { |
504 | printk(KERN_CONT "FAILED!\n"); | |
505 | goto out; | |
506 | } | |
1d4db00a | 507 | /* Only reset on passing, to avoid touching corrupted buffers */ |
86fa2f60 | 508 | for_each_tracing_cpu(i) |
3928a8a2 | 509 | tracing_reset(tr, i); |
86fa2f60 | 510 | |
60a11774 SR |
511 | printk(KERN_CONT "PASSED\n"); |
512 | } | |
513 | #endif | |
514 | ||
bc0c38d1 SR |
515 | type->next = trace_types; |
516 | trace_types = type; | |
517 | len = strlen(type->name); | |
518 | if (len > max_tracer_type_len) | |
519 | max_tracer_type_len = len; | |
60a11774 | 520 | |
bc0c38d1 | 521 | out: |
8e1b82e0 | 522 | tracing_selftest_running = false; |
bc0c38d1 SR |
523 | mutex_unlock(&trace_types_lock); |
524 | ||
dac74940 SR |
525 | if (ret || !default_bootup_tracer) |
526 | goto out_unlock; | |
527 | ||
528 | if (strncmp(default_bootup_tracer, type->name, BOOTUP_TRACER_SIZE)) | |
529 | goto out_unlock; | |
530 | ||
531 | printk(KERN_INFO "Starting tracer '%s'\n", type->name); | |
532 | /* Do we want this tracer to start on bootup? */ | |
533 | tracing_set_tracer(type->name); | |
534 | default_bootup_tracer = NULL; | |
535 | /* disable other selftests, since this will break it. */ | |
536 | tracing_selftest_disabled = 1; | |
b2821ae6 | 537 | #ifdef CONFIG_FTRACE_STARTUP_TEST |
dac74940 SR |
538 | printk(KERN_INFO "Disabling FTRACE selftests due to running tracer '%s'\n", |
539 | type->name); | |
b2821ae6 | 540 | #endif |
b2821ae6 | 541 | |
dac74940 | 542 | out_unlock: |
b2821ae6 | 543 | lock_kernel(); |
bc0c38d1 SR |
544 | return ret; |
545 | } | |
546 | ||
547 | void unregister_tracer(struct tracer *type) | |
548 | { | |
549 | struct tracer **t; | |
550 | int len; | |
551 | ||
552 | mutex_lock(&trace_types_lock); | |
553 | for (t = &trace_types; *t; t = &(*t)->next) { | |
554 | if (*t == type) | |
555 | goto found; | |
556 | } | |
557 | pr_info("Trace %s not registered\n", type->name); | |
558 | goto out; | |
559 | ||
560 | found: | |
561 | *t = (*t)->next; | |
562 | if (strlen(type->name) != max_tracer_type_len) | |
563 | goto out; | |
564 | ||
565 | max_tracer_type_len = 0; | |
566 | for (t = &trace_types; *t; t = &(*t)->next) { | |
567 | len = strlen((*t)->name); | |
568 | if (len > max_tracer_type_len) | |
569 | max_tracer_type_len = len; | |
570 | } | |
571 | out: | |
572 | mutex_unlock(&trace_types_lock); | |
573 | } | |
574 | ||
3928a8a2 | 575 | void tracing_reset(struct trace_array *tr, int cpu) |
bc0c38d1 | 576 | { |
d769041f | 577 | ftrace_disable_cpu(); |
3928a8a2 | 578 | ring_buffer_reset_cpu(tr->buffer, cpu); |
d769041f | 579 | ftrace_enable_cpu(); |
bc0c38d1 SR |
580 | } |
581 | ||
213cc060 PE |
582 | void tracing_reset_online_cpus(struct trace_array *tr) |
583 | { | |
584 | int cpu; | |
585 | ||
586 | tr->time_start = ftrace_now(tr->cpu); | |
587 | ||
588 | for_each_online_cpu(cpu) | |
589 | tracing_reset(tr, cpu); | |
590 | } | |
591 | ||
bc0c38d1 SR |
592 | #define SAVED_CMDLINES 128 |
593 | static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1]; | |
594 | static unsigned map_cmdline_to_pid[SAVED_CMDLINES]; | |
595 | static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN]; | |
596 | static int cmdline_idx; | |
597 | static DEFINE_SPINLOCK(trace_cmdline_lock); | |
25b0b44a | 598 | |
25b0b44a SR |
599 | /* temporary disable recording */ |
600 | atomic_t trace_record_cmdline_disabled __read_mostly; | |
bc0c38d1 SR |
601 | |
602 | static void trace_init_cmdlines(void) | |
603 | { | |
604 | memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline)); | |
605 | memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid)); | |
606 | cmdline_idx = 0; | |
607 | } | |
608 | ||
0f048701 SR |
609 | static int trace_stop_count; |
610 | static DEFINE_SPINLOCK(tracing_start_lock); | |
611 | ||
69bb54ec SR |
612 | /** |
613 | * ftrace_off_permanent - disable all ftrace code permanently | |
614 | * | |
615 | * This should only be called when a serious anomally has | |
616 | * been detected. This will turn off the function tracing, | |
617 | * ring buffers, and other tracing utilites. It takes no | |
618 | * locks and can be called from any context. | |
619 | */ | |
620 | void ftrace_off_permanent(void) | |
621 | { | |
622 | tracing_disabled = 1; | |
623 | ftrace_stop(); | |
624 | tracing_off_permanent(); | |
625 | } | |
626 | ||
0f048701 SR |
627 | /** |
628 | * tracing_start - quick start of the tracer | |
629 | * | |
630 | * If tracing is enabled but was stopped by tracing_stop, | |
631 | * this will start the tracer back up. | |
632 | */ | |
633 | void tracing_start(void) | |
634 | { | |
635 | struct ring_buffer *buffer; | |
636 | unsigned long flags; | |
637 | ||
638 | if (tracing_disabled) | |
639 | return; | |
640 | ||
641 | spin_lock_irqsave(&tracing_start_lock, flags); | |
b06a8301 SR |
642 | if (--trace_stop_count) { |
643 | if (trace_stop_count < 0) { | |
644 | /* Someone screwed up their debugging */ | |
645 | WARN_ON_ONCE(1); | |
646 | trace_stop_count = 0; | |
647 | } | |
0f048701 SR |
648 | goto out; |
649 | } | |
650 | ||
651 | ||
652 | buffer = global_trace.buffer; | |
653 | if (buffer) | |
654 | ring_buffer_record_enable(buffer); | |
655 | ||
656 | buffer = max_tr.buffer; | |
657 | if (buffer) | |
658 | ring_buffer_record_enable(buffer); | |
659 | ||
660 | ftrace_start(); | |
661 | out: | |
662 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
663 | } | |
664 | ||
665 | /** | |
666 | * tracing_stop - quick stop of the tracer | |
667 | * | |
668 | * Light weight way to stop tracing. Use in conjunction with | |
669 | * tracing_start. | |
670 | */ | |
671 | void tracing_stop(void) | |
672 | { | |
673 | struct ring_buffer *buffer; | |
674 | unsigned long flags; | |
675 | ||
676 | ftrace_stop(); | |
677 | spin_lock_irqsave(&tracing_start_lock, flags); | |
678 | if (trace_stop_count++) | |
679 | goto out; | |
680 | ||
681 | buffer = global_trace.buffer; | |
682 | if (buffer) | |
683 | ring_buffer_record_disable(buffer); | |
684 | ||
685 | buffer = max_tr.buffer; | |
686 | if (buffer) | |
687 | ring_buffer_record_disable(buffer); | |
688 | ||
689 | out: | |
690 | spin_unlock_irqrestore(&tracing_start_lock, flags); | |
691 | } | |
692 | ||
e309b41d | 693 | void trace_stop_cmdline_recording(void); |
bc0c38d1 | 694 | |
e309b41d | 695 | static void trace_save_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
696 | { |
697 | unsigned map; | |
698 | unsigned idx; | |
699 | ||
700 | if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT)) | |
701 | return; | |
702 | ||
703 | /* | |
704 | * It's not the end of the world if we don't get | |
705 | * the lock, but we also don't want to spin | |
706 | * nor do we want to disable interrupts, | |
707 | * so if we miss here, then better luck next time. | |
708 | */ | |
709 | if (!spin_trylock(&trace_cmdline_lock)) | |
710 | return; | |
711 | ||
712 | idx = map_pid_to_cmdline[tsk->pid]; | |
713 | if (idx >= SAVED_CMDLINES) { | |
714 | idx = (cmdline_idx + 1) % SAVED_CMDLINES; | |
715 | ||
716 | map = map_cmdline_to_pid[idx]; | |
717 | if (map <= PID_MAX_DEFAULT) | |
718 | map_pid_to_cmdline[map] = (unsigned)-1; | |
719 | ||
720 | map_pid_to_cmdline[tsk->pid] = idx; | |
721 | ||
722 | cmdline_idx = idx; | |
723 | } | |
724 | ||
725 | memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN); | |
726 | ||
727 | spin_unlock(&trace_cmdline_lock); | |
728 | } | |
729 | ||
660c7f9b | 730 | char *trace_find_cmdline(int pid) |
bc0c38d1 SR |
731 | { |
732 | char *cmdline = "<...>"; | |
733 | unsigned map; | |
734 | ||
735 | if (!pid) | |
736 | return "<idle>"; | |
737 | ||
738 | if (pid > PID_MAX_DEFAULT) | |
739 | goto out; | |
740 | ||
741 | map = map_pid_to_cmdline[pid]; | |
742 | if (map >= SAVED_CMDLINES) | |
743 | goto out; | |
744 | ||
745 | cmdline = saved_cmdlines[map]; | |
746 | ||
747 | out: | |
748 | return cmdline; | |
749 | } | |
750 | ||
e309b41d | 751 | void tracing_record_cmdline(struct task_struct *tsk) |
bc0c38d1 SR |
752 | { |
753 | if (atomic_read(&trace_record_cmdline_disabled)) | |
754 | return; | |
755 | ||
756 | trace_save_cmdline(tsk); | |
757 | } | |
758 | ||
45dcd8b8 | 759 | void |
38697053 SR |
760 | tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags, |
761 | int pc) | |
bc0c38d1 SR |
762 | { |
763 | struct task_struct *tsk = current; | |
bc0c38d1 | 764 | |
777e208d SR |
765 | entry->preempt_count = pc & 0xff; |
766 | entry->pid = (tsk) ? tsk->pid : 0; | |
b54d3de9 | 767 | entry->tgid = (tsk) ? tsk->tgid : 0; |
777e208d | 768 | entry->flags = |
9244489a | 769 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
2e2ca155 | 770 | (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) | |
9244489a SR |
771 | #else |
772 | TRACE_FLAG_IRQS_NOSUPPORT | | |
773 | #endif | |
bc0c38d1 SR |
774 | ((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) | |
775 | ((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) | | |
776 | (need_resched() ? TRACE_FLAG_NEED_RESCHED : 0); | |
777 | } | |
778 | ||
51a763dd ACM |
779 | struct ring_buffer_event *trace_buffer_lock_reserve(struct trace_array *tr, |
780 | unsigned char type, | |
781 | unsigned long len, | |
782 | unsigned long flags, int pc) | |
783 | { | |
784 | struct ring_buffer_event *event; | |
785 | ||
786 | event = ring_buffer_lock_reserve(tr->buffer, len); | |
787 | if (event != NULL) { | |
788 | struct trace_entry *ent = ring_buffer_event_data(event); | |
789 | ||
790 | tracing_generic_entry_update(ent, flags, pc); | |
791 | ent->type = type; | |
792 | } | |
793 | ||
794 | return event; | |
795 | } | |
796 | static void ftrace_trace_stack(struct trace_array *tr, | |
797 | unsigned long flags, int skip, int pc); | |
798 | static void ftrace_trace_userstack(struct trace_array *tr, | |
799 | unsigned long flags, int pc); | |
800 | ||
801 | void trace_buffer_unlock_commit(struct trace_array *tr, | |
802 | struct ring_buffer_event *event, | |
803 | unsigned long flags, int pc) | |
804 | { | |
805 | ring_buffer_unlock_commit(tr->buffer, event); | |
806 | ||
807 | ftrace_trace_stack(tr, flags, 6, pc); | |
808 | ftrace_trace_userstack(tr, flags, pc); | |
809 | trace_wake_up(); | |
810 | } | |
811 | ||
e309b41d | 812 | void |
7be42151 | 813 | trace_function(struct trace_array *tr, |
38697053 SR |
814 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
815 | int pc) | |
bc0c38d1 | 816 | { |
3928a8a2 | 817 | struct ring_buffer_event *event; |
777e208d | 818 | struct ftrace_entry *entry; |
bc0c38d1 | 819 | |
d769041f SR |
820 | /* If we are reading the ring buffer, don't trace */ |
821 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
822 | return; | |
823 | ||
51a763dd ACM |
824 | event = trace_buffer_lock_reserve(tr, TRACE_FN, sizeof(*entry), |
825 | flags, pc); | |
3928a8a2 SR |
826 | if (!event) |
827 | return; | |
828 | entry = ring_buffer_event_data(event); | |
777e208d SR |
829 | entry->ip = ip; |
830 | entry->parent_ip = parent_ip; | |
0a987751 | 831 | ring_buffer_unlock_commit(tr->buffer, event); |
bc0c38d1 SR |
832 | } |
833 | ||
fb52607a | 834 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
287b6e68 | 835 | static void __trace_graph_entry(struct trace_array *tr, |
287b6e68 FW |
836 | struct ftrace_graph_ent *trace, |
837 | unsigned long flags, | |
838 | int pc) | |
839 | { | |
840 | struct ring_buffer_event *event; | |
841 | struct ftrace_graph_ent_entry *entry; | |
287b6e68 FW |
842 | |
843 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
844 | return; | |
845 | ||
51a763dd ACM |
846 | event = trace_buffer_lock_reserve(&global_trace, TRACE_GRAPH_ENT, |
847 | sizeof(*entry), flags, pc); | |
287b6e68 FW |
848 | if (!event) |
849 | return; | |
850 | entry = ring_buffer_event_data(event); | |
287b6e68 | 851 | entry->graph_ent = *trace; |
0a987751 | 852 | ring_buffer_unlock_commit(global_trace.buffer, event); |
287b6e68 FW |
853 | } |
854 | ||
855 | static void __trace_graph_return(struct trace_array *tr, | |
fb52607a | 856 | struct ftrace_graph_ret *trace, |
15e6cb36 FW |
857 | unsigned long flags, |
858 | int pc) | |
859 | { | |
860 | struct ring_buffer_event *event; | |
287b6e68 | 861 | struct ftrace_graph_ret_entry *entry; |
15e6cb36 FW |
862 | |
863 | if (unlikely(local_read(&__get_cpu_var(ftrace_cpu_disabled)))) | |
864 | return; | |
865 | ||
51a763dd ACM |
866 | event = trace_buffer_lock_reserve(&global_trace, TRACE_GRAPH_RET, |
867 | sizeof(*entry), flags, pc); | |
15e6cb36 FW |
868 | if (!event) |
869 | return; | |
870 | entry = ring_buffer_event_data(event); | |
287b6e68 | 871 | entry->ret = *trace; |
0a987751 | 872 | ring_buffer_unlock_commit(global_trace.buffer, event); |
15e6cb36 FW |
873 | } |
874 | #endif | |
875 | ||
e309b41d | 876 | void |
2e0f5761 | 877 | ftrace(struct trace_array *tr, struct trace_array_cpu *data, |
38697053 SR |
878 | unsigned long ip, unsigned long parent_ip, unsigned long flags, |
879 | int pc) | |
2e0f5761 IM |
880 | { |
881 | if (likely(!atomic_read(&data->disabled))) | |
7be42151 | 882 | trace_function(tr, ip, parent_ip, flags, pc); |
2e0f5761 IM |
883 | } |
884 | ||
53614991 | 885 | static void __ftrace_trace_stack(struct trace_array *tr, |
53614991 SR |
886 | unsigned long flags, |
887 | int skip, int pc) | |
86387f7e | 888 | { |
c2c80529 | 889 | #ifdef CONFIG_STACKTRACE |
3928a8a2 | 890 | struct ring_buffer_event *event; |
777e208d | 891 | struct stack_entry *entry; |
86387f7e IM |
892 | struct stack_trace trace; |
893 | ||
51a763dd ACM |
894 | event = trace_buffer_lock_reserve(tr, TRACE_STACK, |
895 | sizeof(*entry), flags, pc); | |
3928a8a2 SR |
896 | if (!event) |
897 | return; | |
898 | entry = ring_buffer_event_data(event); | |
777e208d | 899 | memset(&entry->caller, 0, sizeof(entry->caller)); |
86387f7e IM |
900 | |
901 | trace.nr_entries = 0; | |
902 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
903 | trace.skip = skip; | |
777e208d | 904 | trace.entries = entry->caller; |
86387f7e IM |
905 | |
906 | save_stack_trace(&trace); | |
0a987751 | 907 | ring_buffer_unlock_commit(tr->buffer, event); |
c2c80529 | 908 | #endif |
f0a920d5 IM |
909 | } |
910 | ||
53614991 | 911 | static void ftrace_trace_stack(struct trace_array *tr, |
53614991 SR |
912 | unsigned long flags, |
913 | int skip, int pc) | |
914 | { | |
915 | if (!(trace_flags & TRACE_ITER_STACKTRACE)) | |
916 | return; | |
917 | ||
7be42151 | 918 | __ftrace_trace_stack(tr, flags, skip, pc); |
53614991 SR |
919 | } |
920 | ||
38697053 | 921 | void __trace_stack(struct trace_array *tr, |
38697053 | 922 | unsigned long flags, |
53614991 | 923 | int skip, int pc) |
38697053 | 924 | { |
7be42151 | 925 | __ftrace_trace_stack(tr, flags, skip, pc); |
38697053 SR |
926 | } |
927 | ||
02b67518 | 928 | static void ftrace_trace_userstack(struct trace_array *tr, |
7be42151 | 929 | unsigned long flags, int pc) |
02b67518 | 930 | { |
c7425acb | 931 | #ifdef CONFIG_STACKTRACE |
8d7c6a96 | 932 | struct ring_buffer_event *event; |
02b67518 TE |
933 | struct userstack_entry *entry; |
934 | struct stack_trace trace; | |
02b67518 TE |
935 | |
936 | if (!(trace_flags & TRACE_ITER_USERSTACKTRACE)) | |
937 | return; | |
938 | ||
51a763dd ACM |
939 | event = trace_buffer_lock_reserve(tr, TRACE_USER_STACK, |
940 | sizeof(*entry), flags, pc); | |
02b67518 TE |
941 | if (!event) |
942 | return; | |
943 | entry = ring_buffer_event_data(event); | |
02b67518 TE |
944 | |
945 | memset(&entry->caller, 0, sizeof(entry->caller)); | |
946 | ||
947 | trace.nr_entries = 0; | |
948 | trace.max_entries = FTRACE_STACK_ENTRIES; | |
949 | trace.skip = 0; | |
950 | trace.entries = entry->caller; | |
951 | ||
952 | save_stack_trace_user(&trace); | |
0a987751 | 953 | ring_buffer_unlock_commit(tr->buffer, event); |
c7425acb | 954 | #endif |
02b67518 TE |
955 | } |
956 | ||
7be42151 | 957 | void __trace_userstack(struct trace_array *tr, unsigned long flags) |
02b67518 | 958 | { |
7be42151 | 959 | ftrace_trace_userstack(tr, flags, preempt_count()); |
02b67518 TE |
960 | } |
961 | ||
38697053 | 962 | static void |
7be42151 | 963 | ftrace_trace_special(void *__tr, |
38697053 SR |
964 | unsigned long arg1, unsigned long arg2, unsigned long arg3, |
965 | int pc) | |
a4feb834 | 966 | { |
3928a8a2 | 967 | struct ring_buffer_event *event; |
a4feb834 | 968 | struct trace_array *tr = __tr; |
777e208d | 969 | struct special_entry *entry; |
a4feb834 | 970 | |
51a763dd ACM |
971 | event = trace_buffer_lock_reserve(tr, TRACE_SPECIAL, |
972 | sizeof(*entry), 0, pc); | |
3928a8a2 SR |
973 | if (!event) |
974 | return; | |
975 | entry = ring_buffer_event_data(event); | |
777e208d SR |
976 | entry->arg1 = arg1; |
977 | entry->arg2 = arg2; | |
978 | entry->arg3 = arg3; | |
51a763dd | 979 | trace_buffer_unlock_commit(tr, event, 0, pc); |
a4feb834 IM |
980 | } |
981 | ||
38697053 SR |
982 | void |
983 | __trace_special(void *__tr, void *__data, | |
984 | unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
985 | { | |
7be42151 | 986 | ftrace_trace_special(__tr, arg1, arg2, arg3, preempt_count()); |
38697053 SR |
987 | } |
988 | ||
e309b41d | 989 | void |
bc0c38d1 | 990 | tracing_sched_switch_trace(struct trace_array *tr, |
86387f7e IM |
991 | struct task_struct *prev, |
992 | struct task_struct *next, | |
38697053 | 993 | unsigned long flags, int pc) |
bc0c38d1 | 994 | { |
3928a8a2 | 995 | struct ring_buffer_event *event; |
777e208d | 996 | struct ctx_switch_entry *entry; |
bc0c38d1 | 997 | |
51a763dd ACM |
998 | event = trace_buffer_lock_reserve(tr, TRACE_CTX, |
999 | sizeof(*entry), flags, pc); | |
3928a8a2 SR |
1000 | if (!event) |
1001 | return; | |
1002 | entry = ring_buffer_event_data(event); | |
777e208d SR |
1003 | entry->prev_pid = prev->pid; |
1004 | entry->prev_prio = prev->prio; | |
1005 | entry->prev_state = prev->state; | |
1006 | entry->next_pid = next->pid; | |
1007 | entry->next_prio = next->prio; | |
1008 | entry->next_state = next->state; | |
1009 | entry->next_cpu = task_cpu(next); | |
51a763dd | 1010 | trace_buffer_unlock_commit(tr, event, flags, pc); |
bc0c38d1 SR |
1011 | } |
1012 | ||
57422797 IM |
1013 | void |
1014 | tracing_sched_wakeup_trace(struct trace_array *tr, | |
86387f7e IM |
1015 | struct task_struct *wakee, |
1016 | struct task_struct *curr, | |
38697053 | 1017 | unsigned long flags, int pc) |
57422797 | 1018 | { |
3928a8a2 | 1019 | struct ring_buffer_event *event; |
777e208d | 1020 | struct ctx_switch_entry *entry; |
57422797 | 1021 | |
51a763dd ACM |
1022 | event = trace_buffer_lock_reserve(tr, TRACE_WAKE, |
1023 | sizeof(*entry), flags, pc); | |
3928a8a2 SR |
1024 | if (!event) |
1025 | return; | |
1026 | entry = ring_buffer_event_data(event); | |
777e208d SR |
1027 | entry->prev_pid = curr->pid; |
1028 | entry->prev_prio = curr->prio; | |
1029 | entry->prev_state = curr->state; | |
1030 | entry->next_pid = wakee->pid; | |
1031 | entry->next_prio = wakee->prio; | |
1032 | entry->next_state = wakee->state; | |
1033 | entry->next_cpu = task_cpu(wakee); | |
51a763dd | 1034 | trace_buffer_unlock_commit(tr, event, flags, pc); |
57422797 IM |
1035 | } |
1036 | ||
4902f884 SR |
1037 | void |
1038 | ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) | |
1039 | { | |
1040 | struct trace_array *tr = &global_trace; | |
1041 | struct trace_array_cpu *data; | |
5aa1ba6a | 1042 | unsigned long flags; |
4902f884 | 1043 | int cpu; |
38697053 | 1044 | int pc; |
4902f884 | 1045 | |
c76f0694 | 1046 | if (tracing_disabled) |
4902f884 SR |
1047 | return; |
1048 | ||
38697053 | 1049 | pc = preempt_count(); |
5aa1ba6a | 1050 | local_irq_save(flags); |
4902f884 SR |
1051 | cpu = raw_smp_processor_id(); |
1052 | data = tr->data[cpu]; | |
4902f884 | 1053 | |
5aa1ba6a | 1054 | if (likely(atomic_inc_return(&data->disabled) == 1)) |
7be42151 | 1055 | ftrace_trace_special(tr, arg1, arg2, arg3, pc); |
4902f884 | 1056 | |
5aa1ba6a SR |
1057 | atomic_dec(&data->disabled); |
1058 | local_irq_restore(flags); | |
4902f884 SR |
1059 | } |
1060 | ||
fb52607a | 1061 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
e49dc19c | 1062 | int trace_graph_entry(struct ftrace_graph_ent *trace) |
15e6cb36 FW |
1063 | { |
1064 | struct trace_array *tr = &global_trace; | |
1065 | struct trace_array_cpu *data; | |
1066 | unsigned long flags; | |
1067 | long disabled; | |
1068 | int cpu; | |
1069 | int pc; | |
1070 | ||
804a6851 SR |
1071 | if (!ftrace_trace_task(current)) |
1072 | return 0; | |
1073 | ||
ea4e2bc4 SR |
1074 | if (!ftrace_graph_addr(trace->func)) |
1075 | return 0; | |
1076 | ||
a5e25883 | 1077 | local_irq_save(flags); |
15e6cb36 FW |
1078 | cpu = raw_smp_processor_id(); |
1079 | data = tr->data[cpu]; | |
1080 | disabled = atomic_inc_return(&data->disabled); | |
1081 | if (likely(disabled == 1)) { | |
1082 | pc = preempt_count(); | |
7be42151 | 1083 | __trace_graph_entry(tr, trace, flags, pc); |
287b6e68 | 1084 | } |
ea4e2bc4 SR |
1085 | /* Only do the atomic if it is not already set */ |
1086 | if (!test_tsk_trace_graph(current)) | |
1087 | set_tsk_trace_graph(current); | |
287b6e68 | 1088 | atomic_dec(&data->disabled); |
a5e25883 | 1089 | local_irq_restore(flags); |
e49dc19c SR |
1090 | |
1091 | return 1; | |
287b6e68 FW |
1092 | } |
1093 | ||
1094 | void trace_graph_return(struct ftrace_graph_ret *trace) | |
1095 | { | |
1096 | struct trace_array *tr = &global_trace; | |
1097 | struct trace_array_cpu *data; | |
1098 | unsigned long flags; | |
1099 | long disabled; | |
1100 | int cpu; | |
1101 | int pc; | |
1102 | ||
a5e25883 | 1103 | local_irq_save(flags); |
287b6e68 FW |
1104 | cpu = raw_smp_processor_id(); |
1105 | data = tr->data[cpu]; | |
1106 | disabled = atomic_inc_return(&data->disabled); | |
1107 | if (likely(disabled == 1)) { | |
1108 | pc = preempt_count(); | |
7be42151 | 1109 | __trace_graph_return(tr, trace, flags, pc); |
15e6cb36 | 1110 | } |
ea4e2bc4 SR |
1111 | if (!trace->depth) |
1112 | clear_tsk_trace_graph(current); | |
15e6cb36 | 1113 | atomic_dec(&data->disabled); |
a5e25883 | 1114 | local_irq_restore(flags); |
15e6cb36 | 1115 | } |
fb52607a | 1116 | #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ |
15e6cb36 | 1117 | |
bc0c38d1 SR |
1118 | enum trace_file_type { |
1119 | TRACE_FILE_LAT_FMT = 1, | |
12ef7d44 | 1120 | TRACE_FILE_ANNOTATE = 2, |
bc0c38d1 SR |
1121 | }; |
1122 | ||
e2ac8ef5 | 1123 | static void trace_iterator_increment(struct trace_iterator *iter) |
5a90f577 | 1124 | { |
d769041f SR |
1125 | /* Don't allow ftrace to trace into the ring buffers */ |
1126 | ftrace_disable_cpu(); | |
1127 | ||
5a90f577 | 1128 | iter->idx++; |
d769041f SR |
1129 | if (iter->buffer_iter[iter->cpu]) |
1130 | ring_buffer_read(iter->buffer_iter[iter->cpu], NULL); | |
1131 | ||
1132 | ftrace_enable_cpu(); | |
5a90f577 SR |
1133 | } |
1134 | ||
e309b41d | 1135 | static struct trace_entry * |
3928a8a2 | 1136 | peek_next_entry(struct trace_iterator *iter, int cpu, u64 *ts) |
dd0e545f | 1137 | { |
3928a8a2 SR |
1138 | struct ring_buffer_event *event; |
1139 | struct ring_buffer_iter *buf_iter = iter->buffer_iter[cpu]; | |
dd0e545f | 1140 | |
d769041f SR |
1141 | /* Don't allow ftrace to trace into the ring buffers */ |
1142 | ftrace_disable_cpu(); | |
1143 | ||
1144 | if (buf_iter) | |
1145 | event = ring_buffer_iter_peek(buf_iter, ts); | |
1146 | else | |
1147 | event = ring_buffer_peek(iter->tr->buffer, cpu, ts); | |
1148 | ||
1149 | ftrace_enable_cpu(); | |
1150 | ||
3928a8a2 | 1151 | return event ? ring_buffer_event_data(event) : NULL; |
dd0e545f | 1152 | } |
d769041f | 1153 | |
dd0e545f | 1154 | static struct trace_entry * |
3928a8a2 | 1155 | __find_next_entry(struct trace_iterator *iter, int *ent_cpu, u64 *ent_ts) |
bc0c38d1 | 1156 | { |
3928a8a2 | 1157 | struct ring_buffer *buffer = iter->tr->buffer; |
bc0c38d1 | 1158 | struct trace_entry *ent, *next = NULL; |
3928a8a2 | 1159 | u64 next_ts = 0, ts; |
bc0c38d1 SR |
1160 | int next_cpu = -1; |
1161 | int cpu; | |
1162 | ||
ab46428c | 1163 | for_each_tracing_cpu(cpu) { |
dd0e545f | 1164 | |
3928a8a2 SR |
1165 | if (ring_buffer_empty_cpu(buffer, cpu)) |
1166 | continue; | |
dd0e545f | 1167 | |
3928a8a2 | 1168 | ent = peek_next_entry(iter, cpu, &ts); |
dd0e545f | 1169 | |
cdd31cd2 IM |
1170 | /* |
1171 | * Pick the entry with the smallest timestamp: | |
1172 | */ | |
3928a8a2 | 1173 | if (ent && (!next || ts < next_ts)) { |
bc0c38d1 SR |
1174 | next = ent; |
1175 | next_cpu = cpu; | |
3928a8a2 | 1176 | next_ts = ts; |
bc0c38d1 SR |
1177 | } |
1178 | } | |
1179 | ||
1180 | if (ent_cpu) | |
1181 | *ent_cpu = next_cpu; | |
1182 | ||
3928a8a2 SR |
1183 | if (ent_ts) |
1184 | *ent_ts = next_ts; | |
1185 | ||
bc0c38d1 SR |
1186 | return next; |
1187 | } | |
1188 | ||
dd0e545f | 1189 | /* Find the next real entry, without updating the iterator itself */ |
c4a8e8be FW |
1190 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter, |
1191 | int *ent_cpu, u64 *ent_ts) | |
bc0c38d1 | 1192 | { |
3928a8a2 | 1193 | return __find_next_entry(iter, ent_cpu, ent_ts); |
dd0e545f SR |
1194 | } |
1195 | ||
1196 | /* Find the next real entry, and increment the iterator to the next entry */ | |
1197 | static void *find_next_entry_inc(struct trace_iterator *iter) | |
1198 | { | |
3928a8a2 | 1199 | iter->ent = __find_next_entry(iter, &iter->cpu, &iter->ts); |
dd0e545f | 1200 | |
3928a8a2 | 1201 | if (iter->ent) |
e2ac8ef5 | 1202 | trace_iterator_increment(iter); |
dd0e545f | 1203 | |
3928a8a2 | 1204 | return iter->ent ? iter : NULL; |
b3806b43 | 1205 | } |
bc0c38d1 | 1206 | |
e309b41d | 1207 | static void trace_consume(struct trace_iterator *iter) |
b3806b43 | 1208 | { |
d769041f SR |
1209 | /* Don't allow ftrace to trace into the ring buffers */ |
1210 | ftrace_disable_cpu(); | |
3928a8a2 | 1211 | ring_buffer_consume(iter->tr->buffer, iter->cpu, &iter->ts); |
d769041f | 1212 | ftrace_enable_cpu(); |
bc0c38d1 SR |
1213 | } |
1214 | ||
e309b41d | 1215 | static void *s_next(struct seq_file *m, void *v, loff_t *pos) |
bc0c38d1 SR |
1216 | { |
1217 | struct trace_iterator *iter = m->private; | |
bc0c38d1 | 1218 | int i = (int)*pos; |
4e3c3333 | 1219 | void *ent; |
bc0c38d1 SR |
1220 | |
1221 | (*pos)++; | |
1222 | ||
1223 | /* can't go backwards */ | |
1224 | if (iter->idx > i) | |
1225 | return NULL; | |
1226 | ||
1227 | if (iter->idx < 0) | |
1228 | ent = find_next_entry_inc(iter); | |
1229 | else | |
1230 | ent = iter; | |
1231 | ||
1232 | while (ent && iter->idx < i) | |
1233 | ent = find_next_entry_inc(iter); | |
1234 | ||
1235 | iter->pos = *pos; | |
1236 | ||
bc0c38d1 SR |
1237 | return ent; |
1238 | } | |
1239 | ||
1240 | static void *s_start(struct seq_file *m, loff_t *pos) | |
1241 | { | |
1242 | struct trace_iterator *iter = m->private; | |
1243 | void *p = NULL; | |
1244 | loff_t l = 0; | |
3928a8a2 | 1245 | int cpu; |
bc0c38d1 SR |
1246 | |
1247 | mutex_lock(&trace_types_lock); | |
1248 | ||
d15f57f2 SR |
1249 | if (!current_trace || current_trace != iter->trace) { |
1250 | mutex_unlock(&trace_types_lock); | |
bc0c38d1 | 1251 | return NULL; |
d15f57f2 | 1252 | } |
bc0c38d1 SR |
1253 | |
1254 | atomic_inc(&trace_record_cmdline_disabled); | |
1255 | ||
bc0c38d1 SR |
1256 | if (*pos != iter->pos) { |
1257 | iter->ent = NULL; | |
1258 | iter->cpu = 0; | |
1259 | iter->idx = -1; | |
1260 | ||
d769041f SR |
1261 | ftrace_disable_cpu(); |
1262 | ||
3928a8a2 SR |
1263 | for_each_tracing_cpu(cpu) { |
1264 | ring_buffer_iter_reset(iter->buffer_iter[cpu]); | |
4c11d7ae | 1265 | } |
bc0c38d1 | 1266 | |
d769041f SR |
1267 | ftrace_enable_cpu(); |
1268 | ||
bc0c38d1 SR |
1269 | for (p = iter; p && l < *pos; p = s_next(m, p, &l)) |
1270 | ; | |
1271 | ||
1272 | } else { | |
4c11d7ae | 1273 | l = *pos - 1; |
bc0c38d1 SR |
1274 | p = s_next(m, p, &l); |
1275 | } | |
1276 | ||
1277 | return p; | |
1278 | } | |
1279 | ||
1280 | static void s_stop(struct seq_file *m, void *p) | |
1281 | { | |
bc0c38d1 | 1282 | atomic_dec(&trace_record_cmdline_disabled); |
bc0c38d1 SR |
1283 | mutex_unlock(&trace_types_lock); |
1284 | } | |
1285 | ||
e309b41d | 1286 | static void print_lat_help_header(struct seq_file *m) |
bc0c38d1 | 1287 | { |
a6168353 ME |
1288 | seq_puts(m, "# _------=> CPU# \n"); |
1289 | seq_puts(m, "# / _-----=> irqs-off \n"); | |
1290 | seq_puts(m, "# | / _----=> need-resched \n"); | |
1291 | seq_puts(m, "# || / _---=> hardirq/softirq \n"); | |
1292 | seq_puts(m, "# ||| / _--=> preempt-depth \n"); | |
1293 | seq_puts(m, "# |||| / \n"); | |
1294 | seq_puts(m, "# ||||| delay \n"); | |
1295 | seq_puts(m, "# cmd pid ||||| time | caller \n"); | |
1296 | seq_puts(m, "# \\ / ||||| \\ | / \n"); | |
bc0c38d1 SR |
1297 | } |
1298 | ||
e309b41d | 1299 | static void print_func_help_header(struct seq_file *m) |
bc0c38d1 | 1300 | { |
a6168353 ME |
1301 | seq_puts(m, "# TASK-PID CPU# TIMESTAMP FUNCTION\n"); |
1302 | seq_puts(m, "# | | | | |\n"); | |
bc0c38d1 SR |
1303 | } |
1304 | ||
1305 | ||
e309b41d | 1306 | static void |
bc0c38d1 SR |
1307 | print_trace_header(struct seq_file *m, struct trace_iterator *iter) |
1308 | { | |
1309 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); | |
1310 | struct trace_array *tr = iter->tr; | |
1311 | struct trace_array_cpu *data = tr->data[tr->cpu]; | |
1312 | struct tracer *type = current_trace; | |
3928a8a2 SR |
1313 | unsigned long total; |
1314 | unsigned long entries; | |
bc0c38d1 SR |
1315 | const char *name = "preemption"; |
1316 | ||
1317 | if (type) | |
1318 | name = type->name; | |
1319 | ||
3928a8a2 SR |
1320 | entries = ring_buffer_entries(iter->tr->buffer); |
1321 | total = entries + | |
1322 | ring_buffer_overruns(iter->tr->buffer); | |
bc0c38d1 SR |
1323 | |
1324 | seq_printf(m, "%s latency trace v1.1.5 on %s\n", | |
1325 | name, UTS_RELEASE); | |
1326 | seq_puts(m, "-----------------------------------" | |
1327 | "---------------------------------\n"); | |
1328 | seq_printf(m, " latency: %lu us, #%lu/%lu, CPU#%d |" | |
1329 | " (M:%s VP:%d, KP:%d, SP:%d HP:%d", | |
57f50be1 | 1330 | nsecs_to_usecs(data->saved_latency), |
bc0c38d1 | 1331 | entries, |
4c11d7ae | 1332 | total, |
bc0c38d1 SR |
1333 | tr->cpu, |
1334 | #if defined(CONFIG_PREEMPT_NONE) | |
1335 | "server", | |
1336 | #elif defined(CONFIG_PREEMPT_VOLUNTARY) | |
1337 | "desktop", | |
b5c21b45 | 1338 | #elif defined(CONFIG_PREEMPT) |
bc0c38d1 SR |
1339 | "preempt", |
1340 | #else | |
1341 | "unknown", | |
1342 | #endif | |
1343 | /* These are reserved for later use */ | |
1344 | 0, 0, 0, 0); | |
1345 | #ifdef CONFIG_SMP | |
1346 | seq_printf(m, " #P:%d)\n", num_online_cpus()); | |
1347 | #else | |
1348 | seq_puts(m, ")\n"); | |
1349 | #endif | |
1350 | seq_puts(m, " -----------------\n"); | |
1351 | seq_printf(m, " | task: %.16s-%d " | |
1352 | "(uid:%d nice:%ld policy:%ld rt_prio:%ld)\n", | |
1353 | data->comm, data->pid, data->uid, data->nice, | |
1354 | data->policy, data->rt_priority); | |
1355 | seq_puts(m, " -----------------\n"); | |
1356 | ||
1357 | if (data->critical_start) { | |
1358 | seq_puts(m, " => started at: "); | |
214023c3 SR |
1359 | seq_print_ip_sym(&iter->seq, data->critical_start, sym_flags); |
1360 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 | 1361 | seq_puts(m, "\n => ended at: "); |
214023c3 SR |
1362 | seq_print_ip_sym(&iter->seq, data->critical_end, sym_flags); |
1363 | trace_print_seq(m, &iter->seq); | |
bc0c38d1 SR |
1364 | seq_puts(m, "\n"); |
1365 | } | |
1366 | ||
1367 | seq_puts(m, "\n"); | |
1368 | } | |
1369 | ||
a309720c SR |
1370 | static void test_cpu_buff_start(struct trace_iterator *iter) |
1371 | { | |
1372 | struct trace_seq *s = &iter->seq; | |
1373 | ||
12ef7d44 SR |
1374 | if (!(trace_flags & TRACE_ITER_ANNOTATE)) |
1375 | return; | |
1376 | ||
1377 | if (!(iter->iter_flags & TRACE_FILE_ANNOTATE)) | |
1378 | return; | |
1379 | ||
4462344e | 1380 | if (cpumask_test_cpu(iter->cpu, iter->started)) |
a309720c SR |
1381 | return; |
1382 | ||
4462344e | 1383 | cpumask_set_cpu(iter->cpu, iter->started); |
a309720c SR |
1384 | trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu); |
1385 | } | |
1386 | ||
c4a8e8be | 1387 | static enum print_line_t print_lat_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1388 | { |
214023c3 | 1389 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1390 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
f633cef0 | 1391 | struct trace_event *event; |
bc0c38d1 | 1392 | struct trace_entry *entry = iter->ent; |
dd0e545f | 1393 | |
a309720c SR |
1394 | test_cpu_buff_start(iter); |
1395 | ||
c4a8e8be FW |
1396 | event = ftrace_find_event(entry->type); |
1397 | ||
1398 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { | |
d9793bd8 ACM |
1399 | if (!trace_print_lat_context(iter)) |
1400 | goto partial; | |
bc0c38d1 | 1401 | } |
777e208d | 1402 | |
268ccda0 | 1403 | if (event) |
d9793bd8 ACM |
1404 | return event->latency_trace(iter, sym_flags); |
1405 | ||
1406 | if (!trace_seq_printf(s, "Unknown type %d\n", entry->type)) | |
1407 | goto partial; | |
02b67518 | 1408 | |
2c4f035f | 1409 | return TRACE_TYPE_HANDLED; |
d9793bd8 ACM |
1410 | partial: |
1411 | return TRACE_TYPE_PARTIAL_LINE; | |
bc0c38d1 SR |
1412 | } |
1413 | ||
2c4f035f | 1414 | static enum print_line_t print_trace_fmt(struct trace_iterator *iter) |
bc0c38d1 | 1415 | { |
214023c3 | 1416 | struct trace_seq *s = &iter->seq; |
bc0c38d1 | 1417 | unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK); |
4e3c3333 | 1418 | struct trace_entry *entry; |
f633cef0 | 1419 | struct trace_event *event; |
bc0c38d1 | 1420 | |
4e3c3333 | 1421 | entry = iter->ent; |
dd0e545f | 1422 | |
a309720c SR |
1423 | test_cpu_buff_start(iter); |
1424 | ||
c4a8e8be | 1425 | event = ftrace_find_event(entry->type); |
bc0c38d1 | 1426 | |
c4a8e8be | 1427 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
d9793bd8 ACM |
1428 | if (!trace_print_context(iter)) |
1429 | goto partial; | |
c4a8e8be | 1430 | } |
bc0c38d1 | 1431 | |
268ccda0 | 1432 | if (event) |
d9793bd8 ACM |
1433 | return event->trace(iter, sym_flags); |
1434 | ||
1435 | if (!trace_seq_printf(s, "Unknown type %d\n", entry->type)) | |
1436 | goto partial; | |
02b67518 | 1437 | |
2c4f035f | 1438 | return TRACE_TYPE_HANDLED; |
d9793bd8 ACM |
1439 | partial: |
1440 | return TRACE_TYPE_PARTIAL_LINE; | |
bc0c38d1 SR |
1441 | } |
1442 | ||
2c4f035f | 1443 | static enum print_line_t print_raw_fmt(struct trace_iterator *iter) |
f9896bf3 IM |
1444 | { |
1445 | struct trace_seq *s = &iter->seq; | |
1446 | struct trace_entry *entry; | |
f633cef0 | 1447 | struct trace_event *event; |
f9896bf3 IM |
1448 | |
1449 | entry = iter->ent; | |
dd0e545f | 1450 | |
c4a8e8be | 1451 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
d9793bd8 ACM |
1452 | if (!trace_seq_printf(s, "%d %d %llu ", |
1453 | entry->pid, iter->cpu, iter->ts)) | |
1454 | goto partial; | |
c4a8e8be | 1455 | } |
f9896bf3 | 1456 | |
f633cef0 | 1457 | event = ftrace_find_event(entry->type); |
268ccda0 | 1458 | if (event) |
d9793bd8 ACM |
1459 | return event->raw(iter, 0); |
1460 | ||
1461 | if (!trace_seq_printf(s, "%d ?\n", entry->type)) | |
1462 | goto partial; | |
777e208d | 1463 | |
2c4f035f | 1464 | return TRACE_TYPE_HANDLED; |
d9793bd8 ACM |
1465 | partial: |
1466 | return TRACE_TYPE_PARTIAL_LINE; | |
f9896bf3 IM |
1467 | } |
1468 | ||
2c4f035f | 1469 | static enum print_line_t print_hex_fmt(struct trace_iterator *iter) |
5e3ca0ec IM |
1470 | { |
1471 | struct trace_seq *s = &iter->seq; | |
1472 | unsigned char newline = '\n'; | |
1473 | struct trace_entry *entry; | |
f633cef0 | 1474 | struct trace_event *event; |
5e3ca0ec IM |
1475 | |
1476 | entry = iter->ent; | |
dd0e545f | 1477 | |
c4a8e8be FW |
1478 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
1479 | SEQ_PUT_HEX_FIELD_RET(s, entry->pid); | |
1480 | SEQ_PUT_HEX_FIELD_RET(s, iter->cpu); | |
1481 | SEQ_PUT_HEX_FIELD_RET(s, iter->ts); | |
1482 | } | |
5e3ca0ec | 1483 | |
f633cef0 | 1484 | event = ftrace_find_event(entry->type); |
268ccda0 | 1485 | if (event) { |
ae7462b4 | 1486 | enum print_line_t ret = event->hex(iter, 0); |
d9793bd8 ACM |
1487 | if (ret != TRACE_TYPE_HANDLED) |
1488 | return ret; | |
1489 | } | |
7104f300 | 1490 | |
5e3ca0ec IM |
1491 | SEQ_PUT_FIELD_RET(s, newline); |
1492 | ||
2c4f035f | 1493 | return TRACE_TYPE_HANDLED; |
5e3ca0ec IM |
1494 | } |
1495 | ||
66896a85 FW |
1496 | static enum print_line_t print_printk_msg_only(struct trace_iterator *iter) |
1497 | { | |
1498 | struct trace_seq *s = &iter->seq; | |
1499 | struct trace_entry *entry = iter->ent; | |
1500 | struct print_entry *field; | |
1501 | int ret; | |
1502 | ||
1503 | trace_assign_type(field, entry); | |
1504 | ||
c4a8e8be | 1505 | ret = trace_seq_printf(s, "%s", field->buf); |
66896a85 FW |
1506 | if (!ret) |
1507 | return TRACE_TYPE_PARTIAL_LINE; | |
1508 | ||
66896a85 FW |
1509 | return TRACE_TYPE_HANDLED; |
1510 | } | |
1511 | ||
2c4f035f | 1512 | static enum print_line_t print_bin_fmt(struct trace_iterator *iter) |
cb0f12aa IM |
1513 | { |
1514 | struct trace_seq *s = &iter->seq; | |
1515 | struct trace_entry *entry; | |
f633cef0 | 1516 | struct trace_event *event; |
cb0f12aa IM |
1517 | |
1518 | entry = iter->ent; | |
dd0e545f | 1519 | |
c4a8e8be FW |
1520 | if (trace_flags & TRACE_ITER_CONTEXT_INFO) { |
1521 | SEQ_PUT_FIELD_RET(s, entry->pid); | |
1522 | SEQ_PUT_FIELD_RET(s, entry->cpu); | |
1523 | SEQ_PUT_FIELD_RET(s, iter->ts); | |
1524 | } | |
cb0f12aa | 1525 | |
f633cef0 | 1526 | event = ftrace_find_event(entry->type); |
268ccda0 | 1527 | return event ? event->binary(iter, 0) : TRACE_TYPE_HANDLED; |
cb0f12aa IM |
1528 | } |
1529 | ||
bc0c38d1 SR |
1530 | static int trace_empty(struct trace_iterator *iter) |
1531 | { | |
bc0c38d1 SR |
1532 | int cpu; |
1533 | ||
ab46428c | 1534 | for_each_tracing_cpu(cpu) { |
d769041f SR |
1535 | if (iter->buffer_iter[cpu]) { |
1536 | if (!ring_buffer_iter_empty(iter->buffer_iter[cpu])) | |
1537 | return 0; | |
1538 | } else { | |
1539 | if (!ring_buffer_empty_cpu(iter->tr->buffer, cpu)) | |
1540 | return 0; | |
1541 | } | |
bc0c38d1 | 1542 | } |
d769041f | 1543 | |
797d3712 | 1544 | return 1; |
bc0c38d1 SR |
1545 | } |
1546 | ||
2c4f035f | 1547 | static enum print_line_t print_trace_line(struct trace_iterator *iter) |
f9896bf3 | 1548 | { |
2c4f035f FW |
1549 | enum print_line_t ret; |
1550 | ||
1551 | if (iter->trace && iter->trace->print_line) { | |
1552 | ret = iter->trace->print_line(iter); | |
1553 | if (ret != TRACE_TYPE_UNHANDLED) | |
1554 | return ret; | |
1555 | } | |
72829bc3 | 1556 | |
66896a85 FW |
1557 | if (iter->ent->type == TRACE_PRINT && |
1558 | trace_flags & TRACE_ITER_PRINTK && | |
1559 | trace_flags & TRACE_ITER_PRINTK_MSGONLY) | |
1560 | return print_printk_msg_only(iter); | |
1561 | ||
cb0f12aa IM |
1562 | if (trace_flags & TRACE_ITER_BIN) |
1563 | return print_bin_fmt(iter); | |
1564 | ||
5e3ca0ec IM |
1565 | if (trace_flags & TRACE_ITER_HEX) |
1566 | return print_hex_fmt(iter); | |
1567 | ||
f9896bf3 IM |
1568 | if (trace_flags & TRACE_ITER_RAW) |
1569 | return print_raw_fmt(iter); | |
1570 | ||
1571 | if (iter->iter_flags & TRACE_FILE_LAT_FMT) | |
c4a8e8be | 1572 | return print_lat_fmt(iter); |
f9896bf3 IM |
1573 | |
1574 | return print_trace_fmt(iter); | |
1575 | } | |
1576 | ||
bc0c38d1 SR |
1577 | static int s_show(struct seq_file *m, void *v) |
1578 | { | |
1579 | struct trace_iterator *iter = v; | |
1580 | ||
1581 | if (iter->ent == NULL) { | |
1582 | if (iter->tr) { | |
1583 | seq_printf(m, "# tracer: %s\n", iter->trace->name); | |
1584 | seq_puts(m, "#\n"); | |
1585 | } | |
8bba1bf5 MM |
1586 | if (iter->trace && iter->trace->print_header) |
1587 | iter->trace->print_header(m); | |
1588 | else if (iter->iter_flags & TRACE_FILE_LAT_FMT) { | |
bc0c38d1 SR |
1589 | /* print nothing if the buffers are empty */ |
1590 | if (trace_empty(iter)) | |
1591 | return 0; | |
1592 | print_trace_header(m, iter); | |
1593 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1594 | print_lat_help_header(m); | |
1595 | } else { | |
1596 | if (!(trace_flags & TRACE_ITER_VERBOSE)) | |
1597 | print_func_help_header(m); | |
1598 | } | |
1599 | } else { | |
f9896bf3 | 1600 | print_trace_line(iter); |
214023c3 | 1601 | trace_print_seq(m, &iter->seq); |
bc0c38d1 SR |
1602 | } |
1603 | ||
1604 | return 0; | |
1605 | } | |
1606 | ||
1607 | static struct seq_operations tracer_seq_ops = { | |
4bf39a94 IM |
1608 | .start = s_start, |
1609 | .next = s_next, | |
1610 | .stop = s_stop, | |
1611 | .show = s_show, | |
bc0c38d1 SR |
1612 | }; |
1613 | ||
e309b41d | 1614 | static struct trace_iterator * |
bc0c38d1 SR |
1615 | __tracing_open(struct inode *inode, struct file *file, int *ret) |
1616 | { | |
1617 | struct trace_iterator *iter; | |
3928a8a2 SR |
1618 | struct seq_file *m; |
1619 | int cpu; | |
bc0c38d1 | 1620 | |
60a11774 SR |
1621 | if (tracing_disabled) { |
1622 | *ret = -ENODEV; | |
1623 | return NULL; | |
1624 | } | |
1625 | ||
bc0c38d1 SR |
1626 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); |
1627 | if (!iter) { | |
1628 | *ret = -ENOMEM; | |
1629 | goto out; | |
1630 | } | |
1631 | ||
1632 | mutex_lock(&trace_types_lock); | |
1633 | if (current_trace && current_trace->print_max) | |
1634 | iter->tr = &max_tr; | |
1635 | else | |
1636 | iter->tr = inode->i_private; | |
1637 | iter->trace = current_trace; | |
1638 | iter->pos = -1; | |
1639 | ||
8bba1bf5 MM |
1640 | /* Notify the tracer early; before we stop tracing. */ |
1641 | if (iter->trace && iter->trace->open) | |
a93751ca | 1642 | iter->trace->open(iter); |
8bba1bf5 | 1643 | |
12ef7d44 SR |
1644 | /* Annotate start of buffers if we had overruns */ |
1645 | if (ring_buffer_overruns(iter->tr->buffer)) | |
1646 | iter->iter_flags |= TRACE_FILE_ANNOTATE; | |
1647 | ||
1648 | ||
3928a8a2 | 1649 | for_each_tracing_cpu(cpu) { |
d769041f | 1650 | |
3928a8a2 SR |
1651 | iter->buffer_iter[cpu] = |
1652 | ring_buffer_read_start(iter->tr->buffer, cpu); | |
d769041f | 1653 | |
3928a8a2 SR |
1654 | if (!iter->buffer_iter[cpu]) |
1655 | goto fail_buffer; | |
1656 | } | |
1657 | ||
bc0c38d1 SR |
1658 | /* TODO stop tracer */ |
1659 | *ret = seq_open(file, &tracer_seq_ops); | |
3928a8a2 SR |
1660 | if (*ret) |
1661 | goto fail_buffer; | |
bc0c38d1 | 1662 | |
3928a8a2 SR |
1663 | m = file->private_data; |
1664 | m->private = iter; | |
bc0c38d1 | 1665 | |
3928a8a2 | 1666 | /* stop the trace while dumping */ |
9036990d | 1667 | tracing_stop(); |
3928a8a2 | 1668 | |
bc0c38d1 SR |
1669 | mutex_unlock(&trace_types_lock); |
1670 | ||
1671 | out: | |
1672 | return iter; | |
3928a8a2 SR |
1673 | |
1674 | fail_buffer: | |
1675 | for_each_tracing_cpu(cpu) { | |
1676 | if (iter->buffer_iter[cpu]) | |
1677 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
1678 | } | |
1679 | mutex_unlock(&trace_types_lock); | |
0bb943c7 | 1680 | kfree(iter); |
3928a8a2 SR |
1681 | |
1682 | return ERR_PTR(-ENOMEM); | |
bc0c38d1 SR |
1683 | } |
1684 | ||
1685 | int tracing_open_generic(struct inode *inode, struct file *filp) | |
1686 | { | |
60a11774 SR |
1687 | if (tracing_disabled) |
1688 | return -ENODEV; | |
1689 | ||
bc0c38d1 SR |
1690 | filp->private_data = inode->i_private; |
1691 | return 0; | |
1692 | } | |
1693 | ||
1694 | int tracing_release(struct inode *inode, struct file *file) | |
1695 | { | |
1696 | struct seq_file *m = (struct seq_file *)file->private_data; | |
1697 | struct trace_iterator *iter = m->private; | |
3928a8a2 | 1698 | int cpu; |
bc0c38d1 SR |
1699 | |
1700 | mutex_lock(&trace_types_lock); | |
3928a8a2 SR |
1701 | for_each_tracing_cpu(cpu) { |
1702 | if (iter->buffer_iter[cpu]) | |
1703 | ring_buffer_read_finish(iter->buffer_iter[cpu]); | |
1704 | } | |
1705 | ||
bc0c38d1 SR |
1706 | if (iter->trace && iter->trace->close) |
1707 | iter->trace->close(iter); | |
1708 | ||
1709 | /* reenable tracing if it was previously enabled */ | |
9036990d | 1710 | tracing_start(); |
bc0c38d1 SR |
1711 | mutex_unlock(&trace_types_lock); |
1712 | ||
1713 | seq_release(inode, file); | |
1714 | kfree(iter); | |
1715 | return 0; | |
1716 | } | |
1717 | ||
1718 | static int tracing_open(struct inode *inode, struct file *file) | |
1719 | { | |
1720 | int ret; | |
1721 | ||
1722 | __tracing_open(inode, file, &ret); | |
1723 | ||
1724 | return ret; | |
1725 | } | |
1726 | ||
1727 | static int tracing_lt_open(struct inode *inode, struct file *file) | |
1728 | { | |
1729 | struct trace_iterator *iter; | |
1730 | int ret; | |
1731 | ||
1732 | iter = __tracing_open(inode, file, &ret); | |
1733 | ||
1734 | if (!ret) | |
1735 | iter->iter_flags |= TRACE_FILE_LAT_FMT; | |
1736 | ||
1737 | return ret; | |
1738 | } | |
1739 | ||
1740 | ||
e309b41d | 1741 | static void * |
bc0c38d1 SR |
1742 | t_next(struct seq_file *m, void *v, loff_t *pos) |
1743 | { | |
1744 | struct tracer *t = m->private; | |
1745 | ||
1746 | (*pos)++; | |
1747 | ||
1748 | if (t) | |
1749 | t = t->next; | |
1750 | ||
1751 | m->private = t; | |
1752 | ||
1753 | return t; | |
1754 | } | |
1755 | ||
1756 | static void *t_start(struct seq_file *m, loff_t *pos) | |
1757 | { | |
1758 | struct tracer *t = m->private; | |
1759 | loff_t l = 0; | |
1760 | ||
1761 | mutex_lock(&trace_types_lock); | |
1762 | for (; t && l < *pos; t = t_next(m, t, &l)) | |
1763 | ; | |
1764 | ||
1765 | return t; | |
1766 | } | |
1767 | ||
1768 | static void t_stop(struct seq_file *m, void *p) | |
1769 | { | |
1770 | mutex_unlock(&trace_types_lock); | |
1771 | } | |
1772 | ||
1773 | static int t_show(struct seq_file *m, void *v) | |
1774 | { | |
1775 | struct tracer *t = v; | |
1776 | ||
1777 | if (!t) | |
1778 | return 0; | |
1779 | ||
1780 | seq_printf(m, "%s", t->name); | |
1781 | if (t->next) | |
1782 | seq_putc(m, ' '); | |
1783 | else | |
1784 | seq_putc(m, '\n'); | |
1785 | ||
1786 | return 0; | |
1787 | } | |
1788 | ||
1789 | static struct seq_operations show_traces_seq_ops = { | |
4bf39a94 IM |
1790 | .start = t_start, |
1791 | .next = t_next, | |
1792 | .stop = t_stop, | |
1793 | .show = t_show, | |
bc0c38d1 SR |
1794 | }; |
1795 | ||
1796 | static int show_traces_open(struct inode *inode, struct file *file) | |
1797 | { | |
1798 | int ret; | |
1799 | ||
60a11774 SR |
1800 | if (tracing_disabled) |
1801 | return -ENODEV; | |
1802 | ||
bc0c38d1 SR |
1803 | ret = seq_open(file, &show_traces_seq_ops); |
1804 | if (!ret) { | |
1805 | struct seq_file *m = file->private_data; | |
1806 | m->private = trace_types; | |
1807 | } | |
1808 | ||
1809 | return ret; | |
1810 | } | |
1811 | ||
1812 | static struct file_operations tracing_fops = { | |
4bf39a94 IM |
1813 | .open = tracing_open, |
1814 | .read = seq_read, | |
1815 | .llseek = seq_lseek, | |
1816 | .release = tracing_release, | |
bc0c38d1 SR |
1817 | }; |
1818 | ||
1819 | static struct file_operations tracing_lt_fops = { | |
4bf39a94 IM |
1820 | .open = tracing_lt_open, |
1821 | .read = seq_read, | |
1822 | .llseek = seq_lseek, | |
1823 | .release = tracing_release, | |
bc0c38d1 SR |
1824 | }; |
1825 | ||
1826 | static struct file_operations show_traces_fops = { | |
c7078de1 IM |
1827 | .open = show_traces_open, |
1828 | .read = seq_read, | |
1829 | .release = seq_release, | |
1830 | }; | |
1831 | ||
36dfe925 IM |
1832 | /* |
1833 | * Only trace on a CPU if the bitmask is set: | |
1834 | */ | |
9e01c1b7 | 1835 | static cpumask_var_t tracing_cpumask; |
36dfe925 IM |
1836 | |
1837 | /* | |
1838 | * The tracer itself will not take this lock, but still we want | |
1839 | * to provide a consistent cpumask to user-space: | |
1840 | */ | |
1841 | static DEFINE_MUTEX(tracing_cpumask_update_lock); | |
1842 | ||
1843 | /* | |
1844 | * Temporary storage for the character representation of the | |
1845 | * CPU bitmask (and one more byte for the newline): | |
1846 | */ | |
1847 | static char mask_str[NR_CPUS + 1]; | |
1848 | ||
c7078de1 IM |
1849 | static ssize_t |
1850 | tracing_cpumask_read(struct file *filp, char __user *ubuf, | |
1851 | size_t count, loff_t *ppos) | |
1852 | { | |
36dfe925 | 1853 | int len; |
c7078de1 IM |
1854 | |
1855 | mutex_lock(&tracing_cpumask_update_lock); | |
36dfe925 | 1856 | |
9e01c1b7 | 1857 | len = cpumask_scnprintf(mask_str, count, tracing_cpumask); |
36dfe925 IM |
1858 | if (count - len < 2) { |
1859 | count = -EINVAL; | |
1860 | goto out_err; | |
1861 | } | |
1862 | len += sprintf(mask_str + len, "\n"); | |
1863 | count = simple_read_from_buffer(ubuf, count, ppos, mask_str, NR_CPUS+1); | |
1864 | ||
1865 | out_err: | |
c7078de1 IM |
1866 | mutex_unlock(&tracing_cpumask_update_lock); |
1867 | ||
1868 | return count; | |
1869 | } | |
1870 | ||
1871 | static ssize_t | |
1872 | tracing_cpumask_write(struct file *filp, const char __user *ubuf, | |
1873 | size_t count, loff_t *ppos) | |
1874 | { | |
36dfe925 | 1875 | int err, cpu; |
9e01c1b7 RR |
1876 | cpumask_var_t tracing_cpumask_new; |
1877 | ||
1878 | if (!alloc_cpumask_var(&tracing_cpumask_new, GFP_KERNEL)) | |
1879 | return -ENOMEM; | |
c7078de1 IM |
1880 | |
1881 | mutex_lock(&tracing_cpumask_update_lock); | |
9e01c1b7 | 1882 | err = cpumask_parse_user(ubuf, count, tracing_cpumask_new); |
c7078de1 | 1883 | if (err) |
36dfe925 IM |
1884 | goto err_unlock; |
1885 | ||
a5e25883 | 1886 | local_irq_disable(); |
92205c23 | 1887 | __raw_spin_lock(&ftrace_max_lock); |
ab46428c | 1888 | for_each_tracing_cpu(cpu) { |
36dfe925 IM |
1889 | /* |
1890 | * Increase/decrease the disabled counter if we are | |
1891 | * about to flip a bit in the cpumask: | |
1892 | */ | |
9e01c1b7 RR |
1893 | if (cpumask_test_cpu(cpu, tracing_cpumask) && |
1894 | !cpumask_test_cpu(cpu, tracing_cpumask_new)) { | |
36dfe925 IM |
1895 | atomic_inc(&global_trace.data[cpu]->disabled); |
1896 | } | |
9e01c1b7 RR |
1897 | if (!cpumask_test_cpu(cpu, tracing_cpumask) && |
1898 | cpumask_test_cpu(cpu, tracing_cpumask_new)) { | |
36dfe925 IM |
1899 | atomic_dec(&global_trace.data[cpu]->disabled); |
1900 | } | |
1901 | } | |
92205c23 | 1902 | __raw_spin_unlock(&ftrace_max_lock); |
a5e25883 | 1903 | local_irq_enable(); |
36dfe925 | 1904 | |
9e01c1b7 | 1905 | cpumask_copy(tracing_cpumask, tracing_cpumask_new); |
36dfe925 IM |
1906 | |
1907 | mutex_unlock(&tracing_cpumask_update_lock); | |
9e01c1b7 | 1908 | free_cpumask_var(tracing_cpumask_new); |
c7078de1 IM |
1909 | |
1910 | return count; | |
36dfe925 IM |
1911 | |
1912 | err_unlock: | |
1913 | mutex_unlock(&tracing_cpumask_update_lock); | |
9e01c1b7 | 1914 | free_cpumask_var(tracing_cpumask); |
36dfe925 IM |
1915 | |
1916 | return err; | |
c7078de1 IM |
1917 | } |
1918 | ||
1919 | static struct file_operations tracing_cpumask_fops = { | |
1920 | .open = tracing_open_generic, | |
1921 | .read = tracing_cpumask_read, | |
1922 | .write = tracing_cpumask_write, | |
bc0c38d1 SR |
1923 | }; |
1924 | ||
1925 | static ssize_t | |
ee6bce52 | 1926 | tracing_trace_options_read(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
1927 | size_t cnt, loff_t *ppos) |
1928 | { | |
adf9f195 | 1929 | int i; |
bc0c38d1 SR |
1930 | char *buf; |
1931 | int r = 0; | |
1932 | int len = 0; | |
adf9f195 FW |
1933 | u32 tracer_flags = current_trace->flags->val; |
1934 | struct tracer_opt *trace_opts = current_trace->flags->opts; | |
1935 | ||
bc0c38d1 SR |
1936 | |
1937 | /* calulate max size */ | |
1938 | for (i = 0; trace_options[i]; i++) { | |
1939 | len += strlen(trace_options[i]); | |
1940 | len += 3; /* "no" and space */ | |
1941 | } | |
1942 | ||
adf9f195 FW |
1943 | /* |
1944 | * Increase the size with names of options specific | |
1945 | * of the current tracer. | |
1946 | */ | |
1947 | for (i = 0; trace_opts[i].name; i++) { | |
1948 | len += strlen(trace_opts[i].name); | |
1949 | len += 3; /* "no" and space */ | |
1950 | } | |
1951 | ||
bc0c38d1 SR |
1952 | /* +2 for \n and \0 */ |
1953 | buf = kmalloc(len + 2, GFP_KERNEL); | |
1954 | if (!buf) | |
1955 | return -ENOMEM; | |
1956 | ||
1957 | for (i = 0; trace_options[i]; i++) { | |
1958 | if (trace_flags & (1 << i)) | |
1959 | r += sprintf(buf + r, "%s ", trace_options[i]); | |
1960 | else | |
1961 | r += sprintf(buf + r, "no%s ", trace_options[i]); | |
1962 | } | |
1963 | ||
adf9f195 FW |
1964 | for (i = 0; trace_opts[i].name; i++) { |
1965 | if (tracer_flags & trace_opts[i].bit) | |
1966 | r += sprintf(buf + r, "%s ", | |
1967 | trace_opts[i].name); | |
1968 | else | |
1969 | r += sprintf(buf + r, "no%s ", | |
1970 | trace_opts[i].name); | |
1971 | } | |
1972 | ||
bc0c38d1 SR |
1973 | r += sprintf(buf + r, "\n"); |
1974 | WARN_ON(r >= len + 2); | |
1975 | ||
36dfe925 | 1976 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
1977 | |
1978 | kfree(buf); | |
1979 | ||
1980 | return r; | |
1981 | } | |
1982 | ||
adf9f195 FW |
1983 | /* Try to assign a tracer specific option */ |
1984 | static int set_tracer_option(struct tracer *trace, char *cmp, int neg) | |
1985 | { | |
1986 | struct tracer_flags *trace_flags = trace->flags; | |
1987 | struct tracer_opt *opts = NULL; | |
1988 | int ret = 0, i = 0; | |
1989 | int len; | |
1990 | ||
1991 | for (i = 0; trace_flags->opts[i].name; i++) { | |
1992 | opts = &trace_flags->opts[i]; | |
1993 | len = strlen(opts->name); | |
1994 | ||
1995 | if (strncmp(cmp, opts->name, len) == 0) { | |
1996 | ret = trace->set_flag(trace_flags->val, | |
1997 | opts->bit, !neg); | |
1998 | break; | |
1999 | } | |
2000 | } | |
2001 | /* Not found */ | |
2002 | if (!trace_flags->opts[i].name) | |
2003 | return -EINVAL; | |
2004 | ||
2005 | /* Refused to handle */ | |
2006 | if (ret) | |
2007 | return ret; | |
2008 | ||
2009 | if (neg) | |
2010 | trace_flags->val &= ~opts->bit; | |
2011 | else | |
2012 | trace_flags->val |= opts->bit; | |
2013 | ||
2014 | return 0; | |
2015 | } | |
2016 | ||
bc0c38d1 | 2017 | static ssize_t |
ee6bce52 | 2018 | tracing_trace_options_write(struct file *filp, const char __user *ubuf, |
bc0c38d1 SR |
2019 | size_t cnt, loff_t *ppos) |
2020 | { | |
2021 | char buf[64]; | |
2022 | char *cmp = buf; | |
2023 | int neg = 0; | |
adf9f195 | 2024 | int ret; |
bc0c38d1 SR |
2025 | int i; |
2026 | ||
cffae437 SR |
2027 | if (cnt >= sizeof(buf)) |
2028 | return -EINVAL; | |
bc0c38d1 SR |
2029 | |
2030 | if (copy_from_user(&buf, ubuf, cnt)) | |
2031 | return -EFAULT; | |
2032 | ||
2033 | buf[cnt] = 0; | |
2034 | ||
2035 | if (strncmp(buf, "no", 2) == 0) { | |
2036 | neg = 1; | |
2037 | cmp += 2; | |
2038 | } | |
2039 | ||
2040 | for (i = 0; trace_options[i]; i++) { | |
2041 | int len = strlen(trace_options[i]); | |
2042 | ||
2043 | if (strncmp(cmp, trace_options[i], len) == 0) { | |
2044 | if (neg) | |
2045 | trace_flags &= ~(1 << i); | |
2046 | else | |
2047 | trace_flags |= (1 << i); | |
2048 | break; | |
2049 | } | |
2050 | } | |
adf9f195 FW |
2051 | |
2052 | /* If no option could be set, test the specific tracer options */ | |
2053 | if (!trace_options[i]) { | |
2054 | ret = set_tracer_option(current_trace, cmp, neg); | |
2055 | if (ret) | |
2056 | return ret; | |
2057 | } | |
bc0c38d1 SR |
2058 | |
2059 | filp->f_pos += cnt; | |
2060 | ||
2061 | return cnt; | |
2062 | } | |
2063 | ||
2064 | static struct file_operations tracing_iter_fops = { | |
c7078de1 | 2065 | .open = tracing_open_generic, |
ee6bce52 SR |
2066 | .read = tracing_trace_options_read, |
2067 | .write = tracing_trace_options_write, | |
bc0c38d1 SR |
2068 | }; |
2069 | ||
7bd2f24c IM |
2070 | static const char readme_msg[] = |
2071 | "tracing mini-HOWTO:\n\n" | |
2072 | "# mkdir /debug\n" | |
2073 | "# mount -t debugfs nodev /debug\n\n" | |
2074 | "# cat /debug/tracing/available_tracers\n" | |
2075 | "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n" | |
2076 | "# cat /debug/tracing/current_tracer\n" | |
2077 | "none\n" | |
2078 | "# echo sched_switch > /debug/tracing/current_tracer\n" | |
2079 | "# cat /debug/tracing/current_tracer\n" | |
2080 | "sched_switch\n" | |
ee6bce52 | 2081 | "# cat /debug/tracing/trace_options\n" |
7bd2f24c | 2082 | "noprint-parent nosym-offset nosym-addr noverbose\n" |
ee6bce52 | 2083 | "# echo print-parent > /debug/tracing/trace_options\n" |
7bd2f24c IM |
2084 | "# echo 1 > /debug/tracing/tracing_enabled\n" |
2085 | "# cat /debug/tracing/trace > /tmp/trace.txt\n" | |
2086 | "echo 0 > /debug/tracing/tracing_enabled\n" | |
2087 | ; | |
2088 | ||
2089 | static ssize_t | |
2090 | tracing_readme_read(struct file *filp, char __user *ubuf, | |
2091 | size_t cnt, loff_t *ppos) | |
2092 | { | |
2093 | return simple_read_from_buffer(ubuf, cnt, ppos, | |
2094 | readme_msg, strlen(readme_msg)); | |
2095 | } | |
2096 | ||
2097 | static struct file_operations tracing_readme_fops = { | |
c7078de1 IM |
2098 | .open = tracing_open_generic, |
2099 | .read = tracing_readme_read, | |
7bd2f24c IM |
2100 | }; |
2101 | ||
bc0c38d1 SR |
2102 | static ssize_t |
2103 | tracing_ctrl_read(struct file *filp, char __user *ubuf, | |
2104 | size_t cnt, loff_t *ppos) | |
2105 | { | |
bc0c38d1 SR |
2106 | char buf[64]; |
2107 | int r; | |
2108 | ||
9036990d | 2109 | r = sprintf(buf, "%u\n", tracer_enabled); |
4e3c3333 | 2110 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2111 | } |
2112 | ||
2113 | static ssize_t | |
2114 | tracing_ctrl_write(struct file *filp, const char __user *ubuf, | |
2115 | size_t cnt, loff_t *ppos) | |
2116 | { | |
2117 | struct trace_array *tr = filp->private_data; | |
bc0c38d1 | 2118 | char buf[64]; |
c6caeeb1 SR |
2119 | long val; |
2120 | int ret; | |
bc0c38d1 | 2121 | |
cffae437 SR |
2122 | if (cnt >= sizeof(buf)) |
2123 | return -EINVAL; | |
bc0c38d1 SR |
2124 | |
2125 | if (copy_from_user(&buf, ubuf, cnt)) | |
2126 | return -EFAULT; | |
2127 | ||
2128 | buf[cnt] = 0; | |
2129 | ||
c6caeeb1 SR |
2130 | ret = strict_strtoul(buf, 10, &val); |
2131 | if (ret < 0) | |
2132 | return ret; | |
bc0c38d1 SR |
2133 | |
2134 | val = !!val; | |
2135 | ||
2136 | mutex_lock(&trace_types_lock); | |
9036990d SR |
2137 | if (tracer_enabled ^ val) { |
2138 | if (val) { | |
bc0c38d1 | 2139 | tracer_enabled = 1; |
9036990d SR |
2140 | if (current_trace->start) |
2141 | current_trace->start(tr); | |
2142 | tracing_start(); | |
2143 | } else { | |
bc0c38d1 | 2144 | tracer_enabled = 0; |
9036990d SR |
2145 | tracing_stop(); |
2146 | if (current_trace->stop) | |
2147 | current_trace->stop(tr); | |
2148 | } | |
bc0c38d1 SR |
2149 | } |
2150 | mutex_unlock(&trace_types_lock); | |
2151 | ||
2152 | filp->f_pos += cnt; | |
2153 | ||
2154 | return cnt; | |
2155 | } | |
2156 | ||
2157 | static ssize_t | |
2158 | tracing_set_trace_read(struct file *filp, char __user *ubuf, | |
2159 | size_t cnt, loff_t *ppos) | |
2160 | { | |
2161 | char buf[max_tracer_type_len+2]; | |
2162 | int r; | |
2163 | ||
2164 | mutex_lock(&trace_types_lock); | |
2165 | if (current_trace) | |
2166 | r = sprintf(buf, "%s\n", current_trace->name); | |
2167 | else | |
2168 | r = sprintf(buf, "\n"); | |
2169 | mutex_unlock(&trace_types_lock); | |
2170 | ||
4bf39a94 | 2171 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2172 | } |
2173 | ||
b6f11df2 ACM |
2174 | int tracer_init(struct tracer *t, struct trace_array *tr) |
2175 | { | |
2176 | tracing_reset_online_cpus(tr); | |
2177 | return t->init(tr); | |
2178 | } | |
2179 | ||
b2821ae6 | 2180 | static int tracing_set_tracer(const char *buf) |
bc0c38d1 SR |
2181 | { |
2182 | struct trace_array *tr = &global_trace; | |
2183 | struct tracer *t; | |
d9e54076 | 2184 | int ret = 0; |
bc0c38d1 SR |
2185 | |
2186 | mutex_lock(&trace_types_lock); | |
2187 | for (t = trace_types; t; t = t->next) { | |
2188 | if (strcmp(t->name, buf) == 0) | |
2189 | break; | |
2190 | } | |
c2931e05 FW |
2191 | if (!t) { |
2192 | ret = -EINVAL; | |
2193 | goto out; | |
2194 | } | |
2195 | if (t == current_trace) | |
bc0c38d1 SR |
2196 | goto out; |
2197 | ||
9f029e83 | 2198 | trace_branch_disable(); |
bc0c38d1 SR |
2199 | if (current_trace && current_trace->reset) |
2200 | current_trace->reset(tr); | |
2201 | ||
2202 | current_trace = t; | |
1c80025a | 2203 | if (t->init) { |
b6f11df2 | 2204 | ret = tracer_init(t, tr); |
1c80025a FW |
2205 | if (ret) |
2206 | goto out; | |
2207 | } | |
bc0c38d1 | 2208 | |
9f029e83 | 2209 | trace_branch_enable(tr); |
bc0c38d1 SR |
2210 | out: |
2211 | mutex_unlock(&trace_types_lock); | |
2212 | ||
d9e54076 PZ |
2213 | return ret; |
2214 | } | |
2215 | ||
2216 | static ssize_t | |
2217 | tracing_set_trace_write(struct file *filp, const char __user *ubuf, | |
2218 | size_t cnt, loff_t *ppos) | |
2219 | { | |
2220 | char buf[max_tracer_type_len+1]; | |
2221 | int i; | |
2222 | size_t ret; | |
e6e7a65a FW |
2223 | int err; |
2224 | ||
2225 | ret = cnt; | |
d9e54076 PZ |
2226 | |
2227 | if (cnt > max_tracer_type_len) | |
2228 | cnt = max_tracer_type_len; | |
2229 | ||
2230 | if (copy_from_user(&buf, ubuf, cnt)) | |
2231 | return -EFAULT; | |
2232 | ||
2233 | buf[cnt] = 0; | |
2234 | ||
2235 | /* strip ending whitespace. */ | |
2236 | for (i = cnt - 1; i > 0 && isspace(buf[i]); i--) | |
2237 | buf[i] = 0; | |
2238 | ||
e6e7a65a FW |
2239 | err = tracing_set_tracer(buf); |
2240 | if (err) | |
2241 | return err; | |
d9e54076 | 2242 | |
e6e7a65a | 2243 | filp->f_pos += ret; |
bc0c38d1 | 2244 | |
c2931e05 | 2245 | return ret; |
bc0c38d1 SR |
2246 | } |
2247 | ||
2248 | static ssize_t | |
2249 | tracing_max_lat_read(struct file *filp, char __user *ubuf, | |
2250 | size_t cnt, loff_t *ppos) | |
2251 | { | |
2252 | unsigned long *ptr = filp->private_data; | |
2253 | char buf[64]; | |
2254 | int r; | |
2255 | ||
cffae437 | 2256 | r = snprintf(buf, sizeof(buf), "%ld\n", |
bc0c38d1 | 2257 | *ptr == (unsigned long)-1 ? -1 : nsecs_to_usecs(*ptr)); |
cffae437 SR |
2258 | if (r > sizeof(buf)) |
2259 | r = sizeof(buf); | |
4bf39a94 | 2260 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
bc0c38d1 SR |
2261 | } |
2262 | ||
2263 | static ssize_t | |
2264 | tracing_max_lat_write(struct file *filp, const char __user *ubuf, | |
2265 | size_t cnt, loff_t *ppos) | |
2266 | { | |
2267 | long *ptr = filp->private_data; | |
bc0c38d1 | 2268 | char buf[64]; |
c6caeeb1 SR |
2269 | long val; |
2270 | int ret; | |
bc0c38d1 | 2271 | |
cffae437 SR |
2272 | if (cnt >= sizeof(buf)) |
2273 | return -EINVAL; | |
bc0c38d1 SR |
2274 | |
2275 | if (copy_from_user(&buf, ubuf, cnt)) | |
2276 | return -EFAULT; | |
2277 | ||
2278 | buf[cnt] = 0; | |
2279 | ||
c6caeeb1 SR |
2280 | ret = strict_strtoul(buf, 10, &val); |
2281 | if (ret < 0) | |
2282 | return ret; | |
bc0c38d1 SR |
2283 | |
2284 | *ptr = val * 1000; | |
2285 | ||
2286 | return cnt; | |
2287 | } | |
2288 | ||
b3806b43 SR |
2289 | static atomic_t tracing_reader; |
2290 | ||
2291 | static int tracing_open_pipe(struct inode *inode, struct file *filp) | |
2292 | { | |
2293 | struct trace_iterator *iter; | |
2294 | ||
2295 | if (tracing_disabled) | |
2296 | return -ENODEV; | |
2297 | ||
2298 | /* We only allow for reader of the pipe */ | |
2299 | if (atomic_inc_return(&tracing_reader) != 1) { | |
2300 | atomic_dec(&tracing_reader); | |
2301 | return -EBUSY; | |
2302 | } | |
2303 | ||
2304 | /* create a buffer to store the information to pass to userspace */ | |
2305 | iter = kzalloc(sizeof(*iter), GFP_KERNEL); | |
2306 | if (!iter) | |
2307 | return -ENOMEM; | |
2308 | ||
4462344e RR |
2309 | if (!alloc_cpumask_var(&iter->started, GFP_KERNEL)) { |
2310 | kfree(iter); | |
2311 | return -ENOMEM; | |
2312 | } | |
2313 | ||
107bad8b | 2314 | mutex_lock(&trace_types_lock); |
a309720c SR |
2315 | |
2316 | /* trace pipe does not show start of buffer */ | |
4462344e | 2317 | cpumask_setall(iter->started); |
a309720c | 2318 | |
b3806b43 | 2319 | iter->tr = &global_trace; |
72829bc3 | 2320 | iter->trace = current_trace; |
b3806b43 SR |
2321 | filp->private_data = iter; |
2322 | ||
107bad8b SR |
2323 | if (iter->trace->pipe_open) |
2324 | iter->trace->pipe_open(iter); | |
2325 | mutex_unlock(&trace_types_lock); | |
2326 | ||
b3806b43 SR |
2327 | return 0; |
2328 | } | |
2329 | ||
2330 | static int tracing_release_pipe(struct inode *inode, struct file *file) | |
2331 | { | |
2332 | struct trace_iterator *iter = file->private_data; | |
2333 | ||
4462344e | 2334 | free_cpumask_var(iter->started); |
b3806b43 SR |
2335 | kfree(iter); |
2336 | atomic_dec(&tracing_reader); | |
2337 | ||
2338 | return 0; | |
2339 | } | |
2340 | ||
2a2cc8f7 SSP |
2341 | static unsigned int |
2342 | tracing_poll_pipe(struct file *filp, poll_table *poll_table) | |
2343 | { | |
2344 | struct trace_iterator *iter = filp->private_data; | |
2345 | ||
2346 | if (trace_flags & TRACE_ITER_BLOCK) { | |
2347 | /* | |
2348 | * Always select as readable when in blocking mode | |
2349 | */ | |
2350 | return POLLIN | POLLRDNORM; | |
afc2abc0 | 2351 | } else { |
2a2cc8f7 SSP |
2352 | if (!trace_empty(iter)) |
2353 | return POLLIN | POLLRDNORM; | |
2354 | poll_wait(filp, &trace_wait, poll_table); | |
2355 | if (!trace_empty(iter)) | |
2356 | return POLLIN | POLLRDNORM; | |
2357 | ||
2358 | return 0; | |
2359 | } | |
2360 | } | |
2361 | ||
b3806b43 SR |
2362 | /* |
2363 | * Consumer reader. | |
2364 | */ | |
2365 | static ssize_t | |
2366 | tracing_read_pipe(struct file *filp, char __user *ubuf, | |
2367 | size_t cnt, loff_t *ppos) | |
2368 | { | |
2369 | struct trace_iterator *iter = filp->private_data; | |
6c6c2796 | 2370 | ssize_t sret; |
b3806b43 SR |
2371 | |
2372 | /* return any leftover data */ | |
6c6c2796 PP |
2373 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2374 | if (sret != -EBUSY) | |
2375 | return sret; | |
b3806b43 | 2376 | |
6c6c2796 | 2377 | trace_seq_reset(&iter->seq); |
b3806b43 | 2378 | |
107bad8b SR |
2379 | mutex_lock(&trace_types_lock); |
2380 | if (iter->trace->read) { | |
6c6c2796 PP |
2381 | sret = iter->trace->read(iter, filp, ubuf, cnt, ppos); |
2382 | if (sret) | |
107bad8b | 2383 | goto out; |
107bad8b SR |
2384 | } |
2385 | ||
9ff4b974 PP |
2386 | waitagain: |
2387 | sret = 0; | |
b3806b43 | 2388 | while (trace_empty(iter)) { |
2dc8f095 | 2389 | |
107bad8b | 2390 | if ((filp->f_flags & O_NONBLOCK)) { |
6c6c2796 | 2391 | sret = -EAGAIN; |
107bad8b SR |
2392 | goto out; |
2393 | } | |
2dc8f095 | 2394 | |
b3806b43 SR |
2395 | /* |
2396 | * This is a make-shift waitqueue. The reason we don't use | |
2397 | * an actual wait queue is because: | |
2398 | * 1) we only ever have one waiter | |
2399 | * 2) the tracing, traces all functions, we don't want | |
2400 | * the overhead of calling wake_up and friends | |
2401 | * (and tracing them too) | |
2402 | * Anyway, this is really very primitive wakeup. | |
2403 | */ | |
2404 | set_current_state(TASK_INTERRUPTIBLE); | |
2405 | iter->tr->waiter = current; | |
2406 | ||
107bad8b SR |
2407 | mutex_unlock(&trace_types_lock); |
2408 | ||
9fe068e9 IM |
2409 | /* sleep for 100 msecs, and try again. */ |
2410 | schedule_timeout(HZ/10); | |
b3806b43 | 2411 | |
107bad8b SR |
2412 | mutex_lock(&trace_types_lock); |
2413 | ||
b3806b43 SR |
2414 | iter->tr->waiter = NULL; |
2415 | ||
107bad8b | 2416 | if (signal_pending(current)) { |
6c6c2796 | 2417 | sret = -EINTR; |
107bad8b SR |
2418 | goto out; |
2419 | } | |
b3806b43 | 2420 | |
84527997 | 2421 | if (iter->trace != current_trace) |
107bad8b | 2422 | goto out; |
84527997 | 2423 | |
b3806b43 SR |
2424 | /* |
2425 | * We block until we read something and tracing is disabled. | |
2426 | * We still block if tracing is disabled, but we have never | |
2427 | * read anything. This allows a user to cat this file, and | |
2428 | * then enable tracing. But after we have read something, | |
2429 | * we give an EOF when tracing is again disabled. | |
2430 | * | |
2431 | * iter->pos will be 0 if we haven't read anything. | |
2432 | */ | |
2433 | if (!tracer_enabled && iter->pos) | |
2434 | break; | |
2435 | ||
2436 | continue; | |
2437 | } | |
2438 | ||
2439 | /* stop when tracing is finished */ | |
2440 | if (trace_empty(iter)) | |
107bad8b | 2441 | goto out; |
b3806b43 SR |
2442 | |
2443 | if (cnt >= PAGE_SIZE) | |
2444 | cnt = PAGE_SIZE - 1; | |
2445 | ||
53d0aa77 | 2446 | /* reset all but tr, trace, and overruns */ |
53d0aa77 SR |
2447 | memset(&iter->seq, 0, |
2448 | sizeof(struct trace_iterator) - | |
2449 | offsetof(struct trace_iterator, seq)); | |
4823ed7e | 2450 | iter->pos = -1; |
b3806b43 | 2451 | |
088b1e42 | 2452 | while (find_next_entry_inc(iter) != NULL) { |
2c4f035f | 2453 | enum print_line_t ret; |
088b1e42 SR |
2454 | int len = iter->seq.len; |
2455 | ||
f9896bf3 | 2456 | ret = print_trace_line(iter); |
2c4f035f | 2457 | if (ret == TRACE_TYPE_PARTIAL_LINE) { |
088b1e42 SR |
2458 | /* don't print partial lines */ |
2459 | iter->seq.len = len; | |
b3806b43 | 2460 | break; |
088b1e42 | 2461 | } |
b3806b43 SR |
2462 | |
2463 | trace_consume(iter); | |
2464 | ||
2465 | if (iter->seq.len >= cnt) | |
2466 | break; | |
b3806b43 SR |
2467 | } |
2468 | ||
b3806b43 | 2469 | /* Now copy what we have to the user */ |
6c6c2796 PP |
2470 | sret = trace_seq_to_user(&iter->seq, ubuf, cnt); |
2471 | if (iter->seq.readpos >= iter->seq.len) | |
b3806b43 | 2472 | trace_seq_reset(&iter->seq); |
9ff4b974 PP |
2473 | |
2474 | /* | |
2475 | * If there was nothing to send to user, inspite of consuming trace | |
2476 | * entries, go back to wait for more entries. | |
2477 | */ | |
6c6c2796 | 2478 | if (sret == -EBUSY) |
9ff4b974 | 2479 | goto waitagain; |
b3806b43 | 2480 | |
107bad8b SR |
2481 | out: |
2482 | mutex_unlock(&trace_types_lock); | |
2483 | ||
6c6c2796 | 2484 | return sret; |
b3806b43 SR |
2485 | } |
2486 | ||
a98a3c3f SR |
2487 | static ssize_t |
2488 | tracing_entries_read(struct file *filp, char __user *ubuf, | |
2489 | size_t cnt, loff_t *ppos) | |
2490 | { | |
2491 | struct trace_array *tr = filp->private_data; | |
2492 | char buf[64]; | |
2493 | int r; | |
2494 | ||
1696b2b0 | 2495 | r = sprintf(buf, "%lu\n", tr->entries >> 10); |
a98a3c3f SR |
2496 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, r); |
2497 | } | |
2498 | ||
2499 | static ssize_t | |
2500 | tracing_entries_write(struct file *filp, const char __user *ubuf, | |
2501 | size_t cnt, loff_t *ppos) | |
2502 | { | |
2503 | unsigned long val; | |
2504 | char buf[64]; | |
bf5e6519 | 2505 | int ret, cpu; |
a98a3c3f | 2506 | |
cffae437 SR |
2507 | if (cnt >= sizeof(buf)) |
2508 | return -EINVAL; | |
a98a3c3f SR |
2509 | |
2510 | if (copy_from_user(&buf, ubuf, cnt)) | |
2511 | return -EFAULT; | |
2512 | ||
2513 | buf[cnt] = 0; | |
2514 | ||
c6caeeb1 SR |
2515 | ret = strict_strtoul(buf, 10, &val); |
2516 | if (ret < 0) | |
2517 | return ret; | |
a98a3c3f SR |
2518 | |
2519 | /* must have at least 1 entry */ | |
2520 | if (!val) | |
2521 | return -EINVAL; | |
2522 | ||
2523 | mutex_lock(&trace_types_lock); | |
2524 | ||
c76f0694 | 2525 | tracing_stop(); |
a98a3c3f | 2526 | |
bf5e6519 SR |
2527 | /* disable all cpu buffers */ |
2528 | for_each_tracing_cpu(cpu) { | |
2529 | if (global_trace.data[cpu]) | |
2530 | atomic_inc(&global_trace.data[cpu]->disabled); | |
2531 | if (max_tr.data[cpu]) | |
2532 | atomic_inc(&max_tr.data[cpu]->disabled); | |
2533 | } | |
2534 | ||
1696b2b0 SR |
2535 | /* value is in KB */ |
2536 | val <<= 10; | |
2537 | ||
3928a8a2 SR |
2538 | if (val != global_trace.entries) { |
2539 | ret = ring_buffer_resize(global_trace.buffer, val); | |
2540 | if (ret < 0) { | |
2541 | cnt = ret; | |
3eefae99 SR |
2542 | goto out; |
2543 | } | |
2544 | ||
3928a8a2 SR |
2545 | ret = ring_buffer_resize(max_tr.buffer, val); |
2546 | if (ret < 0) { | |
2547 | int r; | |
2548 | cnt = ret; | |
2549 | r = ring_buffer_resize(global_trace.buffer, | |
2550 | global_trace.entries); | |
2551 | if (r < 0) { | |
2552 | /* AARGH! We are left with different | |
2553 | * size max buffer!!!! */ | |
2554 | WARN_ON(1); | |
2555 | tracing_disabled = 1; | |
a98a3c3f | 2556 | } |
3928a8a2 | 2557 | goto out; |
a98a3c3f | 2558 | } |
3eefae99 | 2559 | |
3928a8a2 | 2560 | global_trace.entries = val; |
a98a3c3f SR |
2561 | } |
2562 | ||
2563 | filp->f_pos += cnt; | |
2564 | ||
19384c03 SR |
2565 | /* If check pages failed, return ENOMEM */ |
2566 | if (tracing_disabled) | |
2567 | cnt = -ENOMEM; | |
a98a3c3f | 2568 | out: |
bf5e6519 SR |
2569 | for_each_tracing_cpu(cpu) { |
2570 | if (global_trace.data[cpu]) | |
2571 | atomic_dec(&global_trace.data[cpu]->disabled); | |
2572 | if (max_tr.data[cpu]) | |
2573 | atomic_dec(&max_tr.data[cpu]->disabled); | |
2574 | } | |
2575 | ||
c76f0694 | 2576 | tracing_start(); |
a98a3c3f SR |
2577 | max_tr.entries = global_trace.entries; |
2578 | mutex_unlock(&trace_types_lock); | |
2579 | ||
2580 | return cnt; | |
2581 | } | |
2582 | ||
5bf9a1ee PP |
2583 | static int mark_printk(const char *fmt, ...) |
2584 | { | |
2585 | int ret; | |
2586 | va_list args; | |
2587 | va_start(args, fmt); | |
1fd8f2a3 | 2588 | ret = trace_vprintk(0, -1, fmt, args); |
5bf9a1ee PP |
2589 | va_end(args); |
2590 | return ret; | |
2591 | } | |
2592 | ||
2593 | static ssize_t | |
2594 | tracing_mark_write(struct file *filp, const char __user *ubuf, | |
2595 | size_t cnt, loff_t *fpos) | |
2596 | { | |
2597 | char *buf; | |
2598 | char *end; | |
5bf9a1ee | 2599 | |
c76f0694 | 2600 | if (tracing_disabled) |
5bf9a1ee PP |
2601 | return -EINVAL; |
2602 | ||
2603 | if (cnt > TRACE_BUF_SIZE) | |
2604 | cnt = TRACE_BUF_SIZE; | |
2605 | ||
2606 | buf = kmalloc(cnt + 1, GFP_KERNEL); | |
2607 | if (buf == NULL) | |
2608 | return -ENOMEM; | |
2609 | ||
2610 | if (copy_from_user(buf, ubuf, cnt)) { | |
2611 | kfree(buf); | |
2612 | return -EFAULT; | |
2613 | } | |
2614 | ||
2615 | /* Cut from the first nil or newline. */ | |
2616 | buf[cnt] = '\0'; | |
2617 | end = strchr(buf, '\n'); | |
2618 | if (end) | |
2619 | *end = '\0'; | |
2620 | ||
2621 | cnt = mark_printk("%s\n", buf); | |
2622 | kfree(buf); | |
2623 | *fpos += cnt; | |
2624 | ||
2625 | return cnt; | |
2626 | } | |
2627 | ||
bc0c38d1 | 2628 | static struct file_operations tracing_max_lat_fops = { |
4bf39a94 IM |
2629 | .open = tracing_open_generic, |
2630 | .read = tracing_max_lat_read, | |
2631 | .write = tracing_max_lat_write, | |
bc0c38d1 SR |
2632 | }; |
2633 | ||
2634 | static struct file_operations tracing_ctrl_fops = { | |
4bf39a94 IM |
2635 | .open = tracing_open_generic, |
2636 | .read = tracing_ctrl_read, | |
2637 | .write = tracing_ctrl_write, | |
bc0c38d1 SR |
2638 | }; |
2639 | ||
2640 | static struct file_operations set_tracer_fops = { | |
4bf39a94 IM |
2641 | .open = tracing_open_generic, |
2642 | .read = tracing_set_trace_read, | |
2643 | .write = tracing_set_trace_write, | |
bc0c38d1 SR |
2644 | }; |
2645 | ||
b3806b43 | 2646 | static struct file_operations tracing_pipe_fops = { |
4bf39a94 | 2647 | .open = tracing_open_pipe, |
2a2cc8f7 | 2648 | .poll = tracing_poll_pipe, |
4bf39a94 IM |
2649 | .read = tracing_read_pipe, |
2650 | .release = tracing_release_pipe, | |
b3806b43 SR |
2651 | }; |
2652 | ||
a98a3c3f SR |
2653 | static struct file_operations tracing_entries_fops = { |
2654 | .open = tracing_open_generic, | |
2655 | .read = tracing_entries_read, | |
2656 | .write = tracing_entries_write, | |
2657 | }; | |
2658 | ||
5bf9a1ee | 2659 | static struct file_operations tracing_mark_fops = { |
43a15386 | 2660 | .open = tracing_open_generic, |
5bf9a1ee PP |
2661 | .write = tracing_mark_write, |
2662 | }; | |
2663 | ||
bc0c38d1 SR |
2664 | #ifdef CONFIG_DYNAMIC_FTRACE |
2665 | ||
b807c3d0 SR |
2666 | int __weak ftrace_arch_read_dyn_info(char *buf, int size) |
2667 | { | |
2668 | return 0; | |
2669 | } | |
2670 | ||
bc0c38d1 | 2671 | static ssize_t |
b807c3d0 | 2672 | tracing_read_dyn_info(struct file *filp, char __user *ubuf, |
bc0c38d1 SR |
2673 | size_t cnt, loff_t *ppos) |
2674 | { | |
a26a2a27 SR |
2675 | static char ftrace_dyn_info_buffer[1024]; |
2676 | static DEFINE_MUTEX(dyn_info_mutex); | |
bc0c38d1 | 2677 | unsigned long *p = filp->private_data; |
b807c3d0 | 2678 | char *buf = ftrace_dyn_info_buffer; |
a26a2a27 | 2679 | int size = ARRAY_SIZE(ftrace_dyn_info_buffer); |
bc0c38d1 SR |
2680 | int r; |
2681 | ||
b807c3d0 SR |
2682 | mutex_lock(&dyn_info_mutex); |
2683 | r = sprintf(buf, "%ld ", *p); | |
4bf39a94 | 2684 | |
a26a2a27 | 2685 | r += ftrace_arch_read_dyn_info(buf+r, (size-1)-r); |
b807c3d0 SR |
2686 | buf[r++] = '\n'; |
2687 | ||
2688 | r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r); | |
2689 | ||
2690 | mutex_unlock(&dyn_info_mutex); | |
2691 | ||
2692 | return r; | |
bc0c38d1 SR |
2693 | } |
2694 | ||
b807c3d0 | 2695 | static struct file_operations tracing_dyn_info_fops = { |
4bf39a94 | 2696 | .open = tracing_open_generic, |
b807c3d0 | 2697 | .read = tracing_read_dyn_info, |
bc0c38d1 SR |
2698 | }; |
2699 | #endif | |
2700 | ||
2701 | static struct dentry *d_tracer; | |
2702 | ||
2703 | struct dentry *tracing_init_dentry(void) | |
2704 | { | |
2705 | static int once; | |
2706 | ||
2707 | if (d_tracer) | |
2708 | return d_tracer; | |
2709 | ||
2710 | d_tracer = debugfs_create_dir("tracing", NULL); | |
2711 | ||
2712 | if (!d_tracer && !once) { | |
2713 | once = 1; | |
2714 | pr_warning("Could not create debugfs directory 'tracing'\n"); | |
2715 | return NULL; | |
2716 | } | |
2717 | ||
2718 | return d_tracer; | |
2719 | } | |
2720 | ||
60a11774 SR |
2721 | #ifdef CONFIG_FTRACE_SELFTEST |
2722 | /* Let selftest have access to static functions in this file */ | |
2723 | #include "trace_selftest.c" | |
2724 | #endif | |
2725 | ||
b5ad384e | 2726 | static __init int tracer_init_debugfs(void) |
bc0c38d1 SR |
2727 | { |
2728 | struct dentry *d_tracer; | |
2729 | struct dentry *entry; | |
2730 | ||
2731 | d_tracer = tracing_init_dentry(); | |
2732 | ||
2733 | entry = debugfs_create_file("tracing_enabled", 0644, d_tracer, | |
2734 | &global_trace, &tracing_ctrl_fops); | |
2735 | if (!entry) | |
2736 | pr_warning("Could not create debugfs 'tracing_enabled' entry\n"); | |
2737 | ||
ee6bce52 | 2738 | entry = debugfs_create_file("trace_options", 0644, d_tracer, |
bc0c38d1 SR |
2739 | NULL, &tracing_iter_fops); |
2740 | if (!entry) | |
ee6bce52 | 2741 | pr_warning("Could not create debugfs 'trace_options' entry\n"); |
bc0c38d1 | 2742 | |
c7078de1 IM |
2743 | entry = debugfs_create_file("tracing_cpumask", 0644, d_tracer, |
2744 | NULL, &tracing_cpumask_fops); | |
2745 | if (!entry) | |
2746 | pr_warning("Could not create debugfs 'tracing_cpumask' entry\n"); | |
2747 | ||
bc0c38d1 SR |
2748 | entry = debugfs_create_file("latency_trace", 0444, d_tracer, |
2749 | &global_trace, &tracing_lt_fops); | |
2750 | if (!entry) | |
2751 | pr_warning("Could not create debugfs 'latency_trace' entry\n"); | |
2752 | ||
2753 | entry = debugfs_create_file("trace", 0444, d_tracer, | |
2754 | &global_trace, &tracing_fops); | |
2755 | if (!entry) | |
2756 | pr_warning("Could not create debugfs 'trace' entry\n"); | |
2757 | ||
2758 | entry = debugfs_create_file("available_tracers", 0444, d_tracer, | |
2759 | &global_trace, &show_traces_fops); | |
2760 | if (!entry) | |
98a983aa | 2761 | pr_warning("Could not create debugfs 'available_tracers' entry\n"); |
bc0c38d1 SR |
2762 | |
2763 | entry = debugfs_create_file("current_tracer", 0444, d_tracer, | |
2764 | &global_trace, &set_tracer_fops); | |
2765 | if (!entry) | |
98a983aa | 2766 | pr_warning("Could not create debugfs 'current_tracer' entry\n"); |
bc0c38d1 SR |
2767 | |
2768 | entry = debugfs_create_file("tracing_max_latency", 0644, d_tracer, | |
2769 | &tracing_max_latency, | |
2770 | &tracing_max_lat_fops); | |
2771 | if (!entry) | |
2772 | pr_warning("Could not create debugfs " | |
2773 | "'tracing_max_latency' entry\n"); | |
2774 | ||
2775 | entry = debugfs_create_file("tracing_thresh", 0644, d_tracer, | |
2776 | &tracing_thresh, &tracing_max_lat_fops); | |
2777 | if (!entry) | |
2778 | pr_warning("Could not create debugfs " | |
98a983aa | 2779 | "'tracing_thresh' entry\n"); |
7bd2f24c IM |
2780 | entry = debugfs_create_file("README", 0644, d_tracer, |
2781 | NULL, &tracing_readme_fops); | |
2782 | if (!entry) | |
2783 | pr_warning("Could not create debugfs 'README' entry\n"); | |
2784 | ||
b3806b43 SR |
2785 | entry = debugfs_create_file("trace_pipe", 0644, d_tracer, |
2786 | NULL, &tracing_pipe_fops); | |
2787 | if (!entry) | |
2788 | pr_warning("Could not create debugfs " | |
98a983aa | 2789 | "'trace_pipe' entry\n"); |
bc0c38d1 | 2790 | |
a94c80e7 | 2791 | entry = debugfs_create_file("buffer_size_kb", 0644, d_tracer, |
a98a3c3f SR |
2792 | &global_trace, &tracing_entries_fops); |
2793 | if (!entry) | |
2794 | pr_warning("Could not create debugfs " | |
a94c80e7 | 2795 | "'buffer_size_kb' entry\n"); |
a98a3c3f | 2796 | |
5bf9a1ee PP |
2797 | entry = debugfs_create_file("trace_marker", 0220, d_tracer, |
2798 | NULL, &tracing_mark_fops); | |
2799 | if (!entry) | |
2800 | pr_warning("Could not create debugfs " | |
2801 | "'trace_marker' entry\n"); | |
2802 | ||
bc0c38d1 SR |
2803 | #ifdef CONFIG_DYNAMIC_FTRACE |
2804 | entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer, | |
2805 | &ftrace_update_tot_cnt, | |
b807c3d0 | 2806 | &tracing_dyn_info_fops); |
bc0c38d1 SR |
2807 | if (!entry) |
2808 | pr_warning("Could not create debugfs " | |
2809 | "'dyn_ftrace_total_info' entry\n"); | |
2810 | #endif | |
d618b3e6 IM |
2811 | #ifdef CONFIG_SYSPROF_TRACER |
2812 | init_tracer_sysprof_debugfs(d_tracer); | |
2813 | #endif | |
b5ad384e | 2814 | return 0; |
bc0c38d1 SR |
2815 | } |
2816 | ||
1fd8f2a3 | 2817 | int trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args) |
dd0e545f | 2818 | { |
dd0e545f SR |
2819 | static DEFINE_SPINLOCK(trace_buf_lock); |
2820 | static char trace_buf[TRACE_BUF_SIZE]; | |
f09ce573 | 2821 | |
3928a8a2 | 2822 | struct ring_buffer_event *event; |
f09ce573 | 2823 | struct trace_array *tr = &global_trace; |
dd0e545f | 2824 | struct trace_array_cpu *data; |
38697053 | 2825 | int cpu, len = 0, size, pc; |
e726f5f9 IM |
2826 | struct print_entry *entry; |
2827 | unsigned long irq_flags; | |
dd0e545f | 2828 | |
8e1b82e0 | 2829 | if (tracing_disabled || tracing_selftest_running) |
dd0e545f SR |
2830 | return 0; |
2831 | ||
38697053 SR |
2832 | pc = preempt_count(); |
2833 | preempt_disable_notrace(); | |
dd0e545f SR |
2834 | cpu = raw_smp_processor_id(); |
2835 | data = tr->data[cpu]; | |
dd0e545f | 2836 | |
3ea2e6d7 | 2837 | if (unlikely(atomic_read(&data->disabled))) |
dd0e545f SR |
2838 | goto out; |
2839 | ||
380c4b14 FW |
2840 | pause_graph_tracing(); |
2841 | spin_lock_irqsave(&trace_buf_lock, irq_flags); | |
801fe400 | 2842 | len = vsnprintf(trace_buf, TRACE_BUF_SIZE, fmt, args); |
dd0e545f SR |
2843 | |
2844 | len = min(len, TRACE_BUF_SIZE-1); | |
2845 | trace_buf[len] = 0; | |
2846 | ||
777e208d | 2847 | size = sizeof(*entry) + len + 1; |
51a763dd | 2848 | event = trace_buffer_lock_reserve(tr, TRACE_PRINT, size, irq_flags, pc); |
3928a8a2 SR |
2849 | if (!event) |
2850 | goto out_unlock; | |
777e208d | 2851 | entry = ring_buffer_event_data(event); |
777e208d | 2852 | entry->ip = ip; |
1fd8f2a3 | 2853 | entry->depth = depth; |
dd0e545f | 2854 | |
777e208d SR |
2855 | memcpy(&entry->buf, trace_buf, len); |
2856 | entry->buf[len] = 0; | |
0a987751 | 2857 | ring_buffer_unlock_commit(tr->buffer, event); |
dd0e545f | 2858 | |
3928a8a2 | 2859 | out_unlock: |
380c4b14 FW |
2860 | spin_unlock_irqrestore(&trace_buf_lock, irq_flags); |
2861 | unpause_graph_tracing(); | |
dd0e545f | 2862 | out: |
38697053 | 2863 | preempt_enable_notrace(); |
dd0e545f SR |
2864 | |
2865 | return len; | |
2866 | } | |
801fe400 PP |
2867 | EXPORT_SYMBOL_GPL(trace_vprintk); |
2868 | ||
2869 | int __ftrace_printk(unsigned long ip, const char *fmt, ...) | |
2870 | { | |
2871 | int ret; | |
2872 | va_list ap; | |
2873 | ||
2874 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
2875 | return 0; | |
2876 | ||
2877 | va_start(ap, fmt); | |
21a8c466 | 2878 | ret = trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap); |
801fe400 PP |
2879 | va_end(ap); |
2880 | return ret; | |
2881 | } | |
dd0e545f SR |
2882 | EXPORT_SYMBOL_GPL(__ftrace_printk); |
2883 | ||
9011262a ACM |
2884 | int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap) |
2885 | { | |
2886 | if (!(trace_flags & TRACE_ITER_PRINTK)) | |
2887 | return 0; | |
2888 | ||
2889 | return trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap); | |
2890 | } | |
2891 | EXPORT_SYMBOL_GPL(__ftrace_vprintk); | |
2892 | ||
3f5a54e3 SR |
2893 | static int trace_panic_handler(struct notifier_block *this, |
2894 | unsigned long event, void *unused) | |
2895 | { | |
944ac425 SR |
2896 | if (ftrace_dump_on_oops) |
2897 | ftrace_dump(); | |
3f5a54e3 SR |
2898 | return NOTIFY_OK; |
2899 | } | |
2900 | ||
2901 | static struct notifier_block trace_panic_notifier = { | |
2902 | .notifier_call = trace_panic_handler, | |
2903 | .next = NULL, | |
2904 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
2905 | }; | |
2906 | ||
2907 | static int trace_die_handler(struct notifier_block *self, | |
2908 | unsigned long val, | |
2909 | void *data) | |
2910 | { | |
2911 | switch (val) { | |
2912 | case DIE_OOPS: | |
944ac425 SR |
2913 | if (ftrace_dump_on_oops) |
2914 | ftrace_dump(); | |
3f5a54e3 SR |
2915 | break; |
2916 | default: | |
2917 | break; | |
2918 | } | |
2919 | return NOTIFY_OK; | |
2920 | } | |
2921 | ||
2922 | static struct notifier_block trace_die_notifier = { | |
2923 | .notifier_call = trace_die_handler, | |
2924 | .priority = 200 | |
2925 | }; | |
2926 | ||
2927 | /* | |
2928 | * printk is set to max of 1024, we really don't need it that big. | |
2929 | * Nothing should be printing 1000 characters anyway. | |
2930 | */ | |
2931 | #define TRACE_MAX_PRINT 1000 | |
2932 | ||
2933 | /* | |
2934 | * Define here KERN_TRACE so that we have one place to modify | |
2935 | * it if we decide to change what log level the ftrace dump | |
2936 | * should be at. | |
2937 | */ | |
428aee14 | 2938 | #define KERN_TRACE KERN_EMERG |
3f5a54e3 SR |
2939 | |
2940 | static void | |
2941 | trace_printk_seq(struct trace_seq *s) | |
2942 | { | |
2943 | /* Probably should print a warning here. */ | |
2944 | if (s->len >= 1000) | |
2945 | s->len = 1000; | |
2946 | ||
2947 | /* should be zero ended, but we are paranoid. */ | |
2948 | s->buffer[s->len] = 0; | |
2949 | ||
2950 | printk(KERN_TRACE "%s", s->buffer); | |
2951 | ||
2952 | trace_seq_reset(s); | |
2953 | } | |
2954 | ||
3f5a54e3 SR |
2955 | void ftrace_dump(void) |
2956 | { | |
2957 | static DEFINE_SPINLOCK(ftrace_dump_lock); | |
2958 | /* use static because iter can be a bit big for the stack */ | |
2959 | static struct trace_iterator iter; | |
3f5a54e3 | 2960 | static int dump_ran; |
d769041f SR |
2961 | unsigned long flags; |
2962 | int cnt = 0, cpu; | |
3f5a54e3 SR |
2963 | |
2964 | /* only one dump */ | |
2965 | spin_lock_irqsave(&ftrace_dump_lock, flags); | |
2966 | if (dump_ran) | |
2967 | goto out; | |
2968 | ||
2969 | dump_ran = 1; | |
2970 | ||
2971 | /* No turning back! */ | |
0ee6b6cf | 2972 | tracing_off(); |
81adbdc0 | 2973 | ftrace_kill(); |
3f5a54e3 | 2974 | |
d769041f SR |
2975 | for_each_tracing_cpu(cpu) { |
2976 | atomic_inc(&global_trace.data[cpu]->disabled); | |
2977 | } | |
2978 | ||
b54d3de9 TE |
2979 | /* don't look at user memory in panic mode */ |
2980 | trace_flags &= ~TRACE_ITER_SYM_USEROBJ; | |
2981 | ||
3f5a54e3 SR |
2982 | printk(KERN_TRACE "Dumping ftrace buffer:\n"); |
2983 | ||
2984 | iter.tr = &global_trace; | |
2985 | iter.trace = current_trace; | |
2986 | ||
2987 | /* | |
2988 | * We need to stop all tracing on all CPUS to read the | |
2989 | * the next buffer. This is a bit expensive, but is | |
2990 | * not done often. We fill all what we can read, | |
2991 | * and then release the locks again. | |
2992 | */ | |
2993 | ||
3f5a54e3 SR |
2994 | while (!trace_empty(&iter)) { |
2995 | ||
2996 | if (!cnt) | |
2997 | printk(KERN_TRACE "---------------------------------\n"); | |
2998 | ||
2999 | cnt++; | |
3000 | ||
3001 | /* reset all but tr, trace, and overruns */ | |
3002 | memset(&iter.seq, 0, | |
3003 | sizeof(struct trace_iterator) - | |
3004 | offsetof(struct trace_iterator, seq)); | |
3005 | iter.iter_flags |= TRACE_FILE_LAT_FMT; | |
3006 | iter.pos = -1; | |
3007 | ||
3008 | if (find_next_entry_inc(&iter) != NULL) { | |
3009 | print_trace_line(&iter); | |
3010 | trace_consume(&iter); | |
3011 | } | |
3012 | ||
3013 | trace_printk_seq(&iter.seq); | |
3014 | } | |
3015 | ||
3016 | if (!cnt) | |
3017 | printk(KERN_TRACE " (ftrace buffer empty)\n"); | |
3018 | else | |
3019 | printk(KERN_TRACE "---------------------------------\n"); | |
3020 | ||
3f5a54e3 SR |
3021 | out: |
3022 | spin_unlock_irqrestore(&ftrace_dump_lock, flags); | |
3023 | } | |
3024 | ||
3928a8a2 | 3025 | __init static int tracer_alloc_buffers(void) |
bc0c38d1 | 3026 | { |
4c11d7ae | 3027 | struct trace_array_cpu *data; |
4c11d7ae | 3028 | int i; |
9e01c1b7 | 3029 | int ret = -ENOMEM; |
4c11d7ae | 3030 | |
9e01c1b7 RR |
3031 | if (!alloc_cpumask_var(&tracing_buffer_mask, GFP_KERNEL)) |
3032 | goto out; | |
3033 | ||
3034 | if (!alloc_cpumask_var(&tracing_cpumask, GFP_KERNEL)) | |
3035 | goto out_free_buffer_mask; | |
4c11d7ae | 3036 | |
9e01c1b7 RR |
3037 | cpumask_copy(tracing_buffer_mask, cpu_possible_mask); |
3038 | cpumask_copy(tracing_cpumask, cpu_all_mask); | |
3039 | ||
3040 | /* TODO: make the number of buffers hot pluggable with CPUS */ | |
3928a8a2 SR |
3041 | global_trace.buffer = ring_buffer_alloc(trace_buf_size, |
3042 | TRACE_BUFFER_FLAGS); | |
3043 | if (!global_trace.buffer) { | |
3044 | printk(KERN_ERR "tracer: failed to allocate ring buffer!\n"); | |
3045 | WARN_ON(1); | |
9e01c1b7 | 3046 | goto out_free_cpumask; |
4c11d7ae | 3047 | } |
3928a8a2 | 3048 | global_trace.entries = ring_buffer_size(global_trace.buffer); |
4c11d7ae | 3049 | |
9e01c1b7 | 3050 | |
4c11d7ae | 3051 | #ifdef CONFIG_TRACER_MAX_TRACE |
3928a8a2 SR |
3052 | max_tr.buffer = ring_buffer_alloc(trace_buf_size, |
3053 | TRACE_BUFFER_FLAGS); | |
3054 | if (!max_tr.buffer) { | |
3055 | printk(KERN_ERR "tracer: failed to allocate max ring buffer!\n"); | |
3056 | WARN_ON(1); | |
3057 | ring_buffer_free(global_trace.buffer); | |
9e01c1b7 | 3058 | goto out_free_cpumask; |
4c11d7ae | 3059 | } |
3928a8a2 SR |
3060 | max_tr.entries = ring_buffer_size(max_tr.buffer); |
3061 | WARN_ON(max_tr.entries != global_trace.entries); | |
a98a3c3f | 3062 | #endif |
ab46428c | 3063 | |
4c11d7ae | 3064 | /* Allocate the first page for all buffers */ |
ab46428c | 3065 | for_each_tracing_cpu(i) { |
4c11d7ae | 3066 | data = global_trace.data[i] = &per_cpu(global_trace_cpu, i); |
bc0c38d1 | 3067 | max_tr.data[i] = &per_cpu(max_data, i); |
4c11d7ae | 3068 | } |
bc0c38d1 | 3069 | |
bc0c38d1 SR |
3070 | trace_init_cmdlines(); |
3071 | ||
43a15386 | 3072 | register_tracer(&nop_trace); |
79fb0768 | 3073 | current_trace = &nop_trace; |
b5ad384e FW |
3074 | #ifdef CONFIG_BOOT_TRACER |
3075 | register_tracer(&boot_tracer); | |
b5ad384e | 3076 | #endif |
60a11774 SR |
3077 | /* All seems OK, enable tracing */ |
3078 | tracing_disabled = 0; | |
3928a8a2 | 3079 | |
3f5a54e3 SR |
3080 | atomic_notifier_chain_register(&panic_notifier_list, |
3081 | &trace_panic_notifier); | |
3082 | ||
3083 | register_die_notifier(&trace_die_notifier); | |
9e01c1b7 | 3084 | ret = 0; |
3f5a54e3 | 3085 | |
9e01c1b7 RR |
3086 | out_free_cpumask: |
3087 | free_cpumask_var(tracing_cpumask); | |
3088 | out_free_buffer_mask: | |
3089 | free_cpumask_var(tracing_buffer_mask); | |
3090 | out: | |
3091 | return ret; | |
bc0c38d1 | 3092 | } |
b2821ae6 SR |
3093 | |
3094 | __init static int clear_boot_tracer(void) | |
3095 | { | |
3096 | /* | |
3097 | * The default tracer at boot buffer is an init section. | |
3098 | * This function is called in lateinit. If we did not | |
3099 | * find the boot tracer, then clear it out, to prevent | |
3100 | * later registration from accessing the buffer that is | |
3101 | * about to be freed. | |
3102 | */ | |
3103 | if (!default_bootup_tracer) | |
3104 | return 0; | |
3105 | ||
3106 | printk(KERN_INFO "ftrace bootup tracer '%s' not registered.\n", | |
3107 | default_bootup_tracer); | |
3108 | default_bootup_tracer = NULL; | |
3109 | ||
3110 | return 0; | |
3111 | } | |
3112 | ||
b5ad384e FW |
3113 | early_initcall(tracer_alloc_buffers); |
3114 | fs_initcall(tracer_init_debugfs); | |
b2821ae6 | 3115 | late_initcall(clear_boot_tracer); |