]>
Commit | Line | Data |
---|---|---|
b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
e6187007 SR |
11 | #include <linux/workqueue.h> |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/kthread.h> | |
b77e38aa SR |
14 | #include <linux/debugfs.h> |
15 | #include <linux/uaccess.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/ctype.h> | |
e6187007 | 18 | #include <linux/delay.h> |
b77e38aa | 19 | |
91729ef9 | 20 | #include "trace_output.h" |
b77e38aa | 21 | |
b628b3e6 SR |
22 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
23 | ||
20c8928a | 24 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 25 | |
a59fd602 SR |
26 | LIST_HEAD(ftrace_events); |
27 | ||
cf027f64 | 28 | int trace_define_field(struct ftrace_event_call *call, char *type, |
a118e4d1 | 29 | char *name, int offset, int size, int is_signed) |
cf027f64 TZ |
30 | { |
31 | struct ftrace_event_field *field; | |
32 | ||
fe9f57f2 | 33 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
34 | if (!field) |
35 | goto err; | |
fe9f57f2 | 36 | |
cf027f64 TZ |
37 | field->name = kstrdup(name, GFP_KERNEL); |
38 | if (!field->name) | |
39 | goto err; | |
fe9f57f2 | 40 | |
cf027f64 TZ |
41 | field->type = kstrdup(type, GFP_KERNEL); |
42 | if (!field->type) | |
43 | goto err; | |
fe9f57f2 | 44 | |
cf027f64 TZ |
45 | field->offset = offset; |
46 | field->size = size; | |
a118e4d1 | 47 | field->is_signed = is_signed; |
cf027f64 TZ |
48 | list_add(&field->link, &call->fields); |
49 | ||
50 | return 0; | |
fe9f57f2 | 51 | |
cf027f64 TZ |
52 | err: |
53 | if (field) { | |
54 | kfree(field->name); | |
55 | kfree(field->type); | |
56 | } | |
57 | kfree(field); | |
fe9f57f2 | 58 | |
cf027f64 TZ |
59 | return -ENOMEM; |
60 | } | |
17c873ec | 61 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 62 | |
2df75e41 LZ |
63 | #ifdef CONFIG_MODULES |
64 | ||
65 | static void trace_destroy_fields(struct ftrace_event_call *call) | |
66 | { | |
67 | struct ftrace_event_field *field, *next; | |
68 | ||
69 | list_for_each_entry_safe(field, next, &call->fields, link) { | |
70 | list_del(&field->link); | |
71 | kfree(field->type); | |
72 | kfree(field->name); | |
73 | kfree(field); | |
74 | } | |
75 | } | |
76 | ||
77 | #endif /* CONFIG_MODULES */ | |
78 | ||
b77e38aa SR |
79 | static void ftrace_clear_events(void) |
80 | { | |
a59fd602 | 81 | struct ftrace_event_call *call; |
b77e38aa | 82 | |
20c8928a | 83 | mutex_lock(&event_mutex); |
a59fd602 | 84 | list_for_each_entry(call, &ftrace_events, list) { |
b77e38aa SR |
85 | |
86 | if (call->enabled) { | |
87 | call->enabled = 0; | |
88 | call->unregfunc(); | |
89 | } | |
b77e38aa | 90 | } |
20c8928a | 91 | mutex_unlock(&event_mutex); |
b77e38aa SR |
92 | } |
93 | ||
fd994989 SR |
94 | static void ftrace_event_enable_disable(struct ftrace_event_call *call, |
95 | int enable) | |
96 | { | |
97 | ||
98 | switch (enable) { | |
99 | case 0: | |
100 | if (call->enabled) { | |
101 | call->enabled = 0; | |
102 | call->unregfunc(); | |
103 | } | |
fd994989 SR |
104 | break; |
105 | case 1: | |
da4d0302 | 106 | if (!call->enabled) { |
fd994989 SR |
107 | call->enabled = 1; |
108 | call->regfunc(); | |
109 | } | |
fd994989 SR |
110 | break; |
111 | } | |
112 | } | |
113 | ||
b77e38aa SR |
114 | static int ftrace_set_clr_event(char *buf, int set) |
115 | { | |
a59fd602 | 116 | struct ftrace_event_call *call; |
b628b3e6 SR |
117 | char *event = NULL, *sub = NULL, *match; |
118 | int ret = -EINVAL; | |
119 | ||
120 | /* | |
121 | * The buf format can be <subsystem>:<event-name> | |
122 | * *:<event-name> means any event by that name. | |
123 | * :<event-name> is the same. | |
124 | * | |
125 | * <subsystem>:* means all events in that subsystem | |
126 | * <subsystem>: means the same. | |
127 | * | |
128 | * <name> (no ':') means all events in a subsystem with | |
129 | * the name <name> or any event that matches <name> | |
130 | */ | |
131 | ||
132 | match = strsep(&buf, ":"); | |
133 | if (buf) { | |
134 | sub = match; | |
135 | event = buf; | |
136 | match = NULL; | |
137 | ||
138 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
139 | sub = NULL; | |
140 | if (!strlen(event) || strcmp(event, "*") == 0) | |
141 | event = NULL; | |
142 | } | |
b77e38aa | 143 | |
11a241a3 | 144 | mutex_lock(&event_mutex); |
a59fd602 | 145 | list_for_each_entry(call, &ftrace_events, list) { |
b77e38aa | 146 | |
40e26815 | 147 | if (!call->name || !call->regfunc) |
1473e441 SR |
148 | continue; |
149 | ||
b628b3e6 SR |
150 | if (match && |
151 | strcmp(match, call->name) != 0 && | |
152 | strcmp(match, call->system) != 0) | |
153 | continue; | |
154 | ||
155 | if (sub && strcmp(sub, call->system) != 0) | |
156 | continue; | |
157 | ||
158 | if (event && strcmp(event, call->name) != 0) | |
b77e38aa | 159 | continue; |
b77e38aa | 160 | |
fd994989 SR |
161 | ftrace_event_enable_disable(call, set); |
162 | ||
b628b3e6 | 163 | ret = 0; |
b77e38aa | 164 | } |
11a241a3 SR |
165 | mutex_unlock(&event_mutex); |
166 | ||
b628b3e6 | 167 | return ret; |
b77e38aa SR |
168 | } |
169 | ||
170 | /* 128 should be much more than enough */ | |
171 | #define EVENT_BUF_SIZE 127 | |
172 | ||
173 | static ssize_t | |
174 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
175 | size_t cnt, loff_t *ppos) | |
176 | { | |
177 | size_t read = 0; | |
178 | int i, set = 1; | |
179 | ssize_t ret; | |
180 | char *buf; | |
181 | char ch; | |
182 | ||
183 | if (!cnt || cnt < 0) | |
184 | return 0; | |
185 | ||
1852fcce SR |
186 | ret = tracing_update_buffers(); |
187 | if (ret < 0) | |
188 | return ret; | |
189 | ||
b77e38aa SR |
190 | ret = get_user(ch, ubuf++); |
191 | if (ret) | |
192 | return ret; | |
193 | read++; | |
194 | cnt--; | |
195 | ||
196 | /* skip white space */ | |
197 | while (cnt && isspace(ch)) { | |
198 | ret = get_user(ch, ubuf++); | |
199 | if (ret) | |
200 | return ret; | |
201 | read++; | |
202 | cnt--; | |
203 | } | |
204 | ||
205 | /* Only white space found? */ | |
206 | if (isspace(ch)) { | |
207 | file->f_pos += read; | |
208 | ret = read; | |
209 | return ret; | |
210 | } | |
211 | ||
212 | buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL); | |
213 | if (!buf) | |
214 | return -ENOMEM; | |
215 | ||
216 | if (cnt > EVENT_BUF_SIZE) | |
217 | cnt = EVENT_BUF_SIZE; | |
218 | ||
219 | i = 0; | |
220 | while (cnt && !isspace(ch)) { | |
221 | if (!i && ch == '!') | |
222 | set = 0; | |
223 | else | |
224 | buf[i++] = ch; | |
225 | ||
226 | ret = get_user(ch, ubuf++); | |
227 | if (ret) | |
228 | goto out_free; | |
229 | read++; | |
230 | cnt--; | |
231 | } | |
232 | buf[i] = 0; | |
233 | ||
234 | file->f_pos += read; | |
235 | ||
236 | ret = ftrace_set_clr_event(buf, set); | |
237 | if (ret) | |
238 | goto out_free; | |
239 | ||
240 | ret = read; | |
241 | ||
242 | out_free: | |
243 | kfree(buf); | |
244 | ||
245 | return ret; | |
246 | } | |
247 | ||
248 | static void * | |
249 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
250 | { | |
a59fd602 SR |
251 | struct list_head *list = m->private; |
252 | struct ftrace_event_call *call; | |
b77e38aa SR |
253 | |
254 | (*pos)++; | |
255 | ||
40e26815 | 256 | for (;;) { |
a59fd602 | 257 | if (list == &ftrace_events) |
40e26815 SR |
258 | return NULL; |
259 | ||
a59fd602 SR |
260 | call = list_entry(list, struct ftrace_event_call, list); |
261 | ||
40e26815 SR |
262 | /* |
263 | * The ftrace subsystem is for showing formats only. | |
264 | * They can not be enabled or disabled via the event files. | |
265 | */ | |
266 | if (call->regfunc) | |
267 | break; | |
268 | ||
a59fd602 | 269 | list = list->next; |
40e26815 | 270 | } |
b77e38aa | 271 | |
a59fd602 | 272 | m->private = list->next; |
b77e38aa SR |
273 | |
274 | return call; | |
275 | } | |
276 | ||
277 | static void *t_start(struct seq_file *m, loff_t *pos) | |
278 | { | |
20c8928a LZ |
279 | mutex_lock(&event_mutex); |
280 | if (*pos == 0) | |
281 | m->private = ftrace_events.next; | |
b77e38aa SR |
282 | return t_next(m, NULL, pos); |
283 | } | |
284 | ||
285 | static void * | |
286 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
287 | { | |
a59fd602 SR |
288 | struct list_head *list = m->private; |
289 | struct ftrace_event_call *call; | |
b77e38aa SR |
290 | |
291 | (*pos)++; | |
292 | ||
293 | retry: | |
a59fd602 | 294 | if (list == &ftrace_events) |
b77e38aa SR |
295 | return NULL; |
296 | ||
a59fd602 SR |
297 | call = list_entry(list, struct ftrace_event_call, list); |
298 | ||
b77e38aa | 299 | if (!call->enabled) { |
a59fd602 | 300 | list = list->next; |
b77e38aa SR |
301 | goto retry; |
302 | } | |
303 | ||
a59fd602 | 304 | m->private = list->next; |
b77e38aa SR |
305 | |
306 | return call; | |
307 | } | |
308 | ||
309 | static void *s_start(struct seq_file *m, loff_t *pos) | |
310 | { | |
20c8928a LZ |
311 | mutex_lock(&event_mutex); |
312 | if (*pos == 0) | |
313 | m->private = ftrace_events.next; | |
b77e38aa SR |
314 | return s_next(m, NULL, pos); |
315 | } | |
316 | ||
317 | static int t_show(struct seq_file *m, void *v) | |
318 | { | |
319 | struct ftrace_event_call *call = v; | |
320 | ||
b628b3e6 SR |
321 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
322 | seq_printf(m, "%s:", call->system); | |
b77e38aa SR |
323 | seq_printf(m, "%s\n", call->name); |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | static void t_stop(struct seq_file *m, void *p) | |
329 | { | |
20c8928a | 330 | mutex_unlock(&event_mutex); |
b77e38aa SR |
331 | } |
332 | ||
333 | static int | |
334 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
335 | { | |
b77e38aa SR |
336 | const struct seq_operations *seq_ops; |
337 | ||
338 | if ((file->f_mode & FMODE_WRITE) && | |
339 | !(file->f_flags & O_APPEND)) | |
340 | ftrace_clear_events(); | |
341 | ||
342 | seq_ops = inode->i_private; | |
20c8928a | 343 | return seq_open(file, seq_ops); |
b77e38aa SR |
344 | } |
345 | ||
1473e441 SR |
346 | static ssize_t |
347 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
348 | loff_t *ppos) | |
349 | { | |
350 | struct ftrace_event_call *call = filp->private_data; | |
351 | char *buf; | |
352 | ||
da4d0302 | 353 | if (call->enabled) |
1473e441 SR |
354 | buf = "1\n"; |
355 | else | |
356 | buf = "0\n"; | |
357 | ||
358 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
359 | } | |
360 | ||
361 | static ssize_t | |
362 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
363 | loff_t *ppos) | |
364 | { | |
365 | struct ftrace_event_call *call = filp->private_data; | |
366 | char buf[64]; | |
367 | unsigned long val; | |
368 | int ret; | |
369 | ||
370 | if (cnt >= sizeof(buf)) | |
371 | return -EINVAL; | |
372 | ||
373 | if (copy_from_user(&buf, ubuf, cnt)) | |
374 | return -EFAULT; | |
375 | ||
376 | buf[cnt] = 0; | |
377 | ||
378 | ret = strict_strtoul(buf, 10, &val); | |
379 | if (ret < 0) | |
380 | return ret; | |
381 | ||
1852fcce SR |
382 | ret = tracing_update_buffers(); |
383 | if (ret < 0) | |
384 | return ret; | |
385 | ||
1473e441 SR |
386 | switch (val) { |
387 | case 0: | |
1473e441 | 388 | case 1: |
11a241a3 | 389 | mutex_lock(&event_mutex); |
fd994989 | 390 | ftrace_event_enable_disable(call, val); |
11a241a3 | 391 | mutex_unlock(&event_mutex); |
1473e441 SR |
392 | break; |
393 | ||
394 | default: | |
395 | return -EINVAL; | |
396 | } | |
397 | ||
398 | *ppos += cnt; | |
399 | ||
400 | return cnt; | |
401 | } | |
402 | ||
75db37d2 SR |
403 | extern char *__bad_type_size(void); |
404 | ||
91729ef9 | 405 | #undef FIELD |
156b5f17 | 406 | #define FIELD(type, name) \ |
75db37d2 | 407 | sizeof(type) != sizeof(field.name) ? __bad_type_size() : \ |
cf027f64 TZ |
408 | #type, "common_" #name, offsetof(typeof(field), name), \ |
409 | sizeof(field.name) | |
91729ef9 SR |
410 | |
411 | static int trace_write_header(struct trace_seq *s) | |
412 | { | |
413 | struct trace_entry field; | |
414 | ||
415 | /* struct trace_entry */ | |
416 | return trace_seq_printf(s, | |
ce8eb2bf SR |
417 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" |
418 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
419 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
420 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
421 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
91729ef9 | 422 | "\n", |
89ec0dee | 423 | FIELD(unsigned short, type), |
91729ef9 SR |
424 | FIELD(unsigned char, flags), |
425 | FIELD(unsigned char, preempt_count), | |
426 | FIELD(int, pid), | |
427 | FIELD(int, tgid)); | |
428 | } | |
da4d0302 | 429 | |
981d081e SR |
430 | static ssize_t |
431 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
432 | loff_t *ppos) | |
433 | { | |
434 | struct ftrace_event_call *call = filp->private_data; | |
435 | struct trace_seq *s; | |
436 | char *buf; | |
437 | int r; | |
438 | ||
c269fc8c TZ |
439 | if (*ppos) |
440 | return 0; | |
441 | ||
981d081e SR |
442 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
443 | if (!s) | |
444 | return -ENOMEM; | |
445 | ||
446 | trace_seq_init(s); | |
447 | ||
c5e4e192 SR |
448 | /* If any of the first writes fail, so will the show_format. */ |
449 | ||
450 | trace_seq_printf(s, "name: %s\n", call->name); | |
451 | trace_seq_printf(s, "ID: %d\n", call->id); | |
452 | trace_seq_printf(s, "format:\n"); | |
91729ef9 SR |
453 | trace_write_header(s); |
454 | ||
981d081e SR |
455 | r = call->show_format(s); |
456 | if (!r) { | |
457 | /* | |
458 | * ug! The format output is bigger than a PAGE!! | |
459 | */ | |
460 | buf = "FORMAT TOO BIG\n"; | |
461 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
462 | buf, strlen(buf)); | |
463 | goto out; | |
464 | } | |
465 | ||
466 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
467 | s->buffer, s->len); | |
468 | out: | |
469 | kfree(s); | |
470 | return r; | |
471 | } | |
472 | ||
23725aee PZ |
473 | static ssize_t |
474 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
475 | { | |
476 | struct ftrace_event_call *call = filp->private_data; | |
477 | struct trace_seq *s; | |
478 | int r; | |
479 | ||
480 | if (*ppos) | |
481 | return 0; | |
482 | ||
483 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
484 | if (!s) | |
485 | return -ENOMEM; | |
486 | ||
487 | trace_seq_init(s); | |
488 | trace_seq_printf(s, "%d\n", call->id); | |
489 | ||
490 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
491 | s->buffer, s->len); | |
492 | kfree(s); | |
493 | return r; | |
494 | } | |
495 | ||
7ce7e424 TZ |
496 | static ssize_t |
497 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
498 | loff_t *ppos) | |
499 | { | |
500 | struct ftrace_event_call *call = filp->private_data; | |
501 | struct trace_seq *s; | |
502 | int r; | |
503 | ||
504 | if (*ppos) | |
505 | return 0; | |
506 | ||
507 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
508 | if (!s) | |
509 | return -ENOMEM; | |
510 | ||
511 | trace_seq_init(s); | |
512 | ||
8b372562 | 513 | print_event_filter(call, s); |
4bda2d51 | 514 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
515 | |
516 | kfree(s); | |
517 | ||
518 | return r; | |
519 | } | |
520 | ||
521 | static ssize_t | |
522 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
523 | loff_t *ppos) | |
524 | { | |
525 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 526 | char *buf; |
7ce7e424 TZ |
527 | int err; |
528 | ||
8b372562 | 529 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
530 | return -EINVAL; |
531 | ||
8b372562 TZ |
532 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
533 | if (!buf) | |
7ce7e424 TZ |
534 | return -ENOMEM; |
535 | ||
8b372562 TZ |
536 | if (copy_from_user(buf, ubuf, cnt)) { |
537 | free_page((unsigned long) buf); | |
538 | return -EFAULT; | |
7ce7e424 | 539 | } |
8b372562 | 540 | buf[cnt] = '\0'; |
7ce7e424 | 541 | |
8b372562 TZ |
542 | err = apply_event_filter(call, buf); |
543 | free_page((unsigned long) buf); | |
544 | if (err < 0) | |
44e9c8b7 | 545 | return err; |
0a19e53c | 546 | |
7ce7e424 TZ |
547 | *ppos += cnt; |
548 | ||
549 | return cnt; | |
550 | } | |
551 | ||
cfb180f3 TZ |
552 | static ssize_t |
553 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
554 | loff_t *ppos) | |
555 | { | |
556 | struct event_subsystem *system = filp->private_data; | |
557 | struct trace_seq *s; | |
558 | int r; | |
559 | ||
560 | if (*ppos) | |
561 | return 0; | |
562 | ||
563 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
564 | if (!s) | |
565 | return -ENOMEM; | |
566 | ||
567 | trace_seq_init(s); | |
568 | ||
8b372562 | 569 | print_subsystem_event_filter(system, s); |
4bda2d51 | 570 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
571 | |
572 | kfree(s); | |
573 | ||
574 | return r; | |
575 | } | |
576 | ||
577 | static ssize_t | |
578 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
579 | loff_t *ppos) | |
580 | { | |
581 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 582 | char *buf; |
cfb180f3 TZ |
583 | int err; |
584 | ||
8b372562 | 585 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
586 | return -EINVAL; |
587 | ||
8b372562 TZ |
588 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
589 | if (!buf) | |
cfb180f3 TZ |
590 | return -ENOMEM; |
591 | ||
8b372562 TZ |
592 | if (copy_from_user(buf, ubuf, cnt)) { |
593 | free_page((unsigned long) buf); | |
594 | return -EFAULT; | |
cfb180f3 | 595 | } |
8b372562 | 596 | buf[cnt] = '\0'; |
cfb180f3 | 597 | |
8b372562 TZ |
598 | err = apply_subsystem_event_filter(system, buf); |
599 | free_page((unsigned long) buf); | |
600 | if (err < 0) | |
44e9c8b7 | 601 | return err; |
cfb180f3 TZ |
602 | |
603 | *ppos += cnt; | |
604 | ||
605 | return cnt; | |
606 | } | |
607 | ||
d1b182a8 SR |
608 | static ssize_t |
609 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
610 | { | |
611 | int (*func)(struct trace_seq *s) = filp->private_data; | |
612 | struct trace_seq *s; | |
613 | int r; | |
614 | ||
615 | if (*ppos) | |
616 | return 0; | |
617 | ||
618 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
619 | if (!s) | |
620 | return -ENOMEM; | |
621 | ||
622 | trace_seq_init(s); | |
623 | ||
624 | func(s); | |
625 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
626 | ||
627 | kfree(s); | |
628 | ||
629 | return r; | |
630 | } | |
631 | ||
b77e38aa SR |
632 | static const struct seq_operations show_event_seq_ops = { |
633 | .start = t_start, | |
634 | .next = t_next, | |
635 | .show = t_show, | |
636 | .stop = t_stop, | |
637 | }; | |
638 | ||
639 | static const struct seq_operations show_set_event_seq_ops = { | |
640 | .start = s_start, | |
641 | .next = s_next, | |
642 | .show = t_show, | |
643 | .stop = t_stop, | |
644 | }; | |
645 | ||
2314c4ae SR |
646 | static const struct file_operations ftrace_avail_fops = { |
647 | .open = ftrace_event_seq_open, | |
648 | .read = seq_read, | |
649 | .llseek = seq_lseek, | |
650 | .release = seq_release, | |
651 | }; | |
652 | ||
b77e38aa SR |
653 | static const struct file_operations ftrace_set_event_fops = { |
654 | .open = ftrace_event_seq_open, | |
655 | .read = seq_read, | |
656 | .write = ftrace_event_write, | |
657 | .llseek = seq_lseek, | |
658 | .release = seq_release, | |
659 | }; | |
660 | ||
1473e441 SR |
661 | static const struct file_operations ftrace_enable_fops = { |
662 | .open = tracing_open_generic, | |
663 | .read = event_enable_read, | |
664 | .write = event_enable_write, | |
665 | }; | |
666 | ||
981d081e SR |
667 | static const struct file_operations ftrace_event_format_fops = { |
668 | .open = tracing_open_generic, | |
669 | .read = event_format_read, | |
670 | }; | |
671 | ||
23725aee PZ |
672 | static const struct file_operations ftrace_event_id_fops = { |
673 | .open = tracing_open_generic, | |
674 | .read = event_id_read, | |
675 | }; | |
676 | ||
7ce7e424 TZ |
677 | static const struct file_operations ftrace_event_filter_fops = { |
678 | .open = tracing_open_generic, | |
679 | .read = event_filter_read, | |
680 | .write = event_filter_write, | |
681 | }; | |
682 | ||
cfb180f3 TZ |
683 | static const struct file_operations ftrace_subsystem_filter_fops = { |
684 | .open = tracing_open_generic, | |
685 | .read = subsystem_filter_read, | |
686 | .write = subsystem_filter_write, | |
687 | }; | |
688 | ||
d1b182a8 SR |
689 | static const struct file_operations ftrace_show_header_fops = { |
690 | .open = tracing_open_generic, | |
691 | .read = show_header, | |
692 | }; | |
693 | ||
1473e441 SR |
694 | static struct dentry *event_trace_events_dir(void) |
695 | { | |
696 | static struct dentry *d_tracer; | |
697 | static struct dentry *d_events; | |
698 | ||
699 | if (d_events) | |
700 | return d_events; | |
701 | ||
702 | d_tracer = tracing_init_dentry(); | |
703 | if (!d_tracer) | |
704 | return NULL; | |
705 | ||
706 | d_events = debugfs_create_dir("events", d_tracer); | |
707 | if (!d_events) | |
708 | pr_warning("Could not create debugfs " | |
709 | "'events' directory\n"); | |
710 | ||
711 | return d_events; | |
712 | } | |
713 | ||
6ecc2d1c SR |
714 | static LIST_HEAD(event_subsystems); |
715 | ||
716 | static struct dentry * | |
717 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
718 | { | |
719 | struct event_subsystem *system; | |
e1112b4d | 720 | struct dentry *entry; |
6ecc2d1c SR |
721 | |
722 | /* First see if we did not already create this dir */ | |
723 | list_for_each_entry(system, &event_subsystems, list) { | |
724 | if (strcmp(system->name, name) == 0) | |
725 | return system->entry; | |
726 | } | |
727 | ||
728 | /* need to create new entry */ | |
729 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
730 | if (!system) { | |
731 | pr_warning("No memory to create event subsystem %s\n", | |
732 | name); | |
733 | return d_events; | |
734 | } | |
735 | ||
736 | system->entry = debugfs_create_dir(name, d_events); | |
737 | if (!system->entry) { | |
738 | pr_warning("Could not create event subsystem %s\n", | |
739 | name); | |
740 | kfree(system); | |
741 | return d_events; | |
742 | } | |
743 | ||
6d723736 SR |
744 | system->name = kstrdup(name, GFP_KERNEL); |
745 | if (!system->name) { | |
746 | debugfs_remove(system->entry); | |
747 | kfree(system); | |
748 | return d_events; | |
749 | } | |
750 | ||
6ecc2d1c SR |
751 | list_add(&system->list, &event_subsystems); |
752 | ||
30e673b2 | 753 | system->filter = NULL; |
cfb180f3 | 754 | |
8b372562 TZ |
755 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
756 | if (!system->filter) { | |
757 | pr_warning("Could not allocate filter for subsystem " | |
758 | "'%s'\n", name); | |
759 | return system->entry; | |
760 | } | |
761 | ||
e1112b4d TZ |
762 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
763 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
764 | if (!entry) { |
765 | kfree(system->filter); | |
766 | system->filter = NULL; | |
e1112b4d TZ |
767 | pr_warning("Could not create debugfs " |
768 | "'%s/filter' entry\n", name); | |
8b372562 | 769 | } |
e1112b4d | 770 | |
6ecc2d1c SR |
771 | return system->entry; |
772 | } | |
773 | ||
1473e441 | 774 | static int |
701970b3 SR |
775 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
776 | const struct file_operations *id, | |
777 | const struct file_operations *enable, | |
778 | const struct file_operations *filter, | |
779 | const struct file_operations *format) | |
1473e441 SR |
780 | { |
781 | struct dentry *entry; | |
fd994989 | 782 | int ret; |
1473e441 | 783 | |
6ecc2d1c SR |
784 | /* |
785 | * If the trace point header did not define TRACE_SYSTEM | |
786 | * then the system would be called "TRACE_SYSTEM". | |
787 | */ | |
6d723736 | 788 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
6ecc2d1c SR |
789 | d_events = event_subsystem_dir(call->system, d_events); |
790 | ||
fd994989 SR |
791 | if (call->raw_init) { |
792 | ret = call->raw_init(); | |
793 | if (ret < 0) { | |
794 | pr_warning("Could not initialize trace point" | |
795 | " events/%s\n", call->name); | |
796 | return ret; | |
797 | } | |
798 | } | |
799 | ||
1473e441 SR |
800 | call->dir = debugfs_create_dir(call->name, d_events); |
801 | if (!call->dir) { | |
802 | pr_warning("Could not create debugfs " | |
803 | "'%s' directory\n", call->name); | |
804 | return -1; | |
805 | } | |
806 | ||
6d723736 SR |
807 | if (call->regfunc) |
808 | entry = trace_create_file("enable", 0644, call->dir, call, | |
701970b3 | 809 | enable); |
1473e441 | 810 | |
6d723736 SR |
811 | if (call->id) |
812 | entry = trace_create_file("id", 0444, call->dir, call, | |
701970b3 | 813 | id); |
23725aee | 814 | |
cf027f64 TZ |
815 | if (call->define_fields) { |
816 | ret = call->define_fields(); | |
817 | if (ret < 0) { | |
818 | pr_warning("Could not initialize trace point" | |
819 | " events/%s\n", call->name); | |
820 | return ret; | |
821 | } | |
6d723736 | 822 | entry = trace_create_file("filter", 0644, call->dir, call, |
701970b3 | 823 | filter); |
cf027f64 TZ |
824 | } |
825 | ||
981d081e SR |
826 | /* A trace may not want to export its format */ |
827 | if (!call->show_format) | |
828 | return 0; | |
829 | ||
6d723736 | 830 | entry = trace_create_file("format", 0444, call->dir, call, |
701970b3 | 831 | format); |
6d723736 SR |
832 | |
833 | return 0; | |
834 | } | |
835 | ||
836 | #define for_each_event(event, start, end) \ | |
837 | for (event = start; \ | |
838 | (unsigned long)event < (unsigned long)end; \ | |
839 | event++) | |
840 | ||
61f919a1 | 841 | #ifdef CONFIG_MODULES |
701970b3 SR |
842 | |
843 | static LIST_HEAD(ftrace_module_file_list); | |
844 | ||
845 | /* | |
846 | * Modules must own their file_operations to keep up with | |
847 | * reference counting. | |
848 | */ | |
849 | struct ftrace_module_file_ops { | |
850 | struct list_head list; | |
851 | struct module *mod; | |
852 | struct file_operations id; | |
853 | struct file_operations enable; | |
854 | struct file_operations format; | |
855 | struct file_operations filter; | |
856 | }; | |
857 | ||
858 | static struct ftrace_module_file_ops * | |
859 | trace_create_file_ops(struct module *mod) | |
860 | { | |
861 | struct ftrace_module_file_ops *file_ops; | |
862 | ||
863 | /* | |
864 | * This is a bit of a PITA. To allow for correct reference | |
865 | * counting, modules must "own" their file_operations. | |
866 | * To do this, we allocate the file operations that will be | |
867 | * used in the event directory. | |
868 | */ | |
869 | ||
870 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
871 | if (!file_ops) | |
872 | return NULL; | |
873 | ||
874 | file_ops->mod = mod; | |
875 | ||
876 | file_ops->id = ftrace_event_id_fops; | |
877 | file_ops->id.owner = mod; | |
878 | ||
879 | file_ops->enable = ftrace_enable_fops; | |
880 | file_ops->enable.owner = mod; | |
881 | ||
882 | file_ops->filter = ftrace_event_filter_fops; | |
883 | file_ops->filter.owner = mod; | |
884 | ||
885 | file_ops->format = ftrace_event_format_fops; | |
886 | file_ops->format.owner = mod; | |
887 | ||
888 | list_add(&file_ops->list, &ftrace_module_file_list); | |
889 | ||
890 | return file_ops; | |
891 | } | |
892 | ||
6d723736 SR |
893 | static void trace_module_add_events(struct module *mod) |
894 | { | |
701970b3 | 895 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
896 | struct ftrace_event_call *call, *start, *end; |
897 | struct dentry *d_events; | |
898 | ||
899 | start = mod->trace_events; | |
900 | end = mod->trace_events + mod->num_trace_events; | |
901 | ||
902 | if (start == end) | |
903 | return; | |
904 | ||
905 | d_events = event_trace_events_dir(); | |
906 | if (!d_events) | |
907 | return; | |
908 | ||
909 | for_each_event(call, start, end) { | |
910 | /* The linker may leave blanks */ | |
911 | if (!call->name) | |
912 | continue; | |
701970b3 SR |
913 | |
914 | /* | |
915 | * This module has events, create file ops for this module | |
916 | * if not already done. | |
917 | */ | |
918 | if (!file_ops) { | |
919 | file_ops = trace_create_file_ops(mod); | |
920 | if (!file_ops) | |
921 | return; | |
922 | } | |
6d723736 SR |
923 | call->mod = mod; |
924 | list_add(&call->list, &ftrace_events); | |
701970b3 SR |
925 | event_create_dir(call, d_events, |
926 | &file_ops->id, &file_ops->enable, | |
927 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
928 | } |
929 | } | |
930 | ||
931 | static void trace_module_remove_events(struct module *mod) | |
932 | { | |
701970b3 | 933 | struct ftrace_module_file_ops *file_ops; |
6d723736 SR |
934 | struct ftrace_event_call *call, *p; |
935 | ||
936 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
937 | if (call->mod == mod) { | |
938 | if (call->enabled) { | |
939 | call->enabled = 0; | |
940 | call->unregfunc(); | |
941 | } | |
942 | if (call->event) | |
943 | unregister_ftrace_event(call->event); | |
944 | debugfs_remove_recursive(call->dir); | |
945 | list_del(&call->list); | |
2df75e41 LZ |
946 | trace_destroy_fields(call); |
947 | destroy_preds(call); | |
6d723736 SR |
948 | } |
949 | } | |
701970b3 SR |
950 | |
951 | /* Now free the file_operations */ | |
952 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
953 | if (file_ops->mod == mod) | |
954 | break; | |
955 | } | |
956 | if (&file_ops->list != &ftrace_module_file_list) { | |
957 | list_del(&file_ops->list); | |
958 | kfree(file_ops); | |
959 | } | |
6d723736 SR |
960 | } |
961 | ||
61f919a1 SR |
962 | static int trace_module_notify(struct notifier_block *self, |
963 | unsigned long val, void *data) | |
6d723736 SR |
964 | { |
965 | struct module *mod = data; | |
966 | ||
967 | mutex_lock(&event_mutex); | |
968 | switch (val) { | |
969 | case MODULE_STATE_COMING: | |
970 | trace_module_add_events(mod); | |
971 | break; | |
972 | case MODULE_STATE_GOING: | |
973 | trace_module_remove_events(mod); | |
974 | break; | |
975 | } | |
976 | mutex_unlock(&event_mutex); | |
fd994989 | 977 | |
1473e441 SR |
978 | return 0; |
979 | } | |
61f919a1 SR |
980 | #else |
981 | static int trace_module_notify(struct notifier_block *self, | |
982 | unsigned long val, void *data) | |
983 | { | |
984 | return 0; | |
985 | } | |
986 | #endif /* CONFIG_MODULES */ | |
1473e441 | 987 | |
6d723736 SR |
988 | struct notifier_block trace_module_nb = { |
989 | .notifier_call = trace_module_notify, | |
990 | .priority = 0, | |
991 | }; | |
992 | ||
a59fd602 SR |
993 | extern struct ftrace_event_call __start_ftrace_events[]; |
994 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
995 | ||
b77e38aa SR |
996 | static __init int event_trace_init(void) |
997 | { | |
a59fd602 | 998 | struct ftrace_event_call *call; |
b77e38aa SR |
999 | struct dentry *d_tracer; |
1000 | struct dentry *entry; | |
1473e441 | 1001 | struct dentry *d_events; |
6d723736 | 1002 | int ret; |
b77e38aa SR |
1003 | |
1004 | d_tracer = tracing_init_dentry(); | |
1005 | if (!d_tracer) | |
1006 | return 0; | |
1007 | ||
2314c4ae SR |
1008 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1009 | (void *)&show_event_seq_ops, | |
1010 | &ftrace_avail_fops); | |
1011 | if (!entry) | |
1012 | pr_warning("Could not create debugfs " | |
1013 | "'available_events' entry\n"); | |
1014 | ||
b77e38aa SR |
1015 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1016 | (void *)&show_set_event_seq_ops, | |
1017 | &ftrace_set_event_fops); | |
1018 | if (!entry) | |
1019 | pr_warning("Could not create debugfs " | |
1020 | "'set_event' entry\n"); | |
1021 | ||
1473e441 SR |
1022 | d_events = event_trace_events_dir(); |
1023 | if (!d_events) | |
1024 | return 0; | |
1025 | ||
d1b182a8 SR |
1026 | /* ring buffer internal formats */ |
1027 | trace_create_file("header_page", 0444, d_events, | |
1028 | ring_buffer_print_page_header, | |
1029 | &ftrace_show_header_fops); | |
1030 | ||
1031 | trace_create_file("header_event", 0444, d_events, | |
1032 | ring_buffer_print_entry_header, | |
1033 | &ftrace_show_header_fops); | |
1034 | ||
6d723736 | 1035 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1036 | /* The linker may leave blanks */ |
1037 | if (!call->name) | |
1038 | continue; | |
a59fd602 | 1039 | list_add(&call->list, &ftrace_events); |
701970b3 SR |
1040 | event_create_dir(call, d_events, &ftrace_event_id_fops, |
1041 | &ftrace_enable_fops, &ftrace_event_filter_fops, | |
1042 | &ftrace_event_format_fops); | |
1473e441 SR |
1043 | } |
1044 | ||
6d723736 SR |
1045 | ret = register_module_notifier(&trace_module_nb); |
1046 | if (!ret) | |
1047 | pr_warning("Failed to register trace events module notifier\n"); | |
1048 | ||
b77e38aa SR |
1049 | return 0; |
1050 | } | |
1051 | fs_initcall(event_trace_init); | |
e6187007 SR |
1052 | |
1053 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1054 | ||
1055 | static DEFINE_SPINLOCK(test_spinlock); | |
1056 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1057 | static DEFINE_MUTEX(test_mutex); | |
1058 | ||
1059 | static __init void test_work(struct work_struct *dummy) | |
1060 | { | |
1061 | spin_lock(&test_spinlock); | |
1062 | spin_lock_irq(&test_spinlock_irq); | |
1063 | udelay(1); | |
1064 | spin_unlock_irq(&test_spinlock_irq); | |
1065 | spin_unlock(&test_spinlock); | |
1066 | ||
1067 | mutex_lock(&test_mutex); | |
1068 | msleep(1); | |
1069 | mutex_unlock(&test_mutex); | |
1070 | } | |
1071 | ||
1072 | static __init int event_test_thread(void *unused) | |
1073 | { | |
1074 | void *test_malloc; | |
1075 | ||
1076 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1077 | if (!test_malloc) | |
1078 | pr_info("failed to kmalloc\n"); | |
1079 | ||
1080 | schedule_on_each_cpu(test_work); | |
1081 | ||
1082 | kfree(test_malloc); | |
1083 | ||
1084 | set_current_state(TASK_INTERRUPTIBLE); | |
1085 | while (!kthread_should_stop()) | |
1086 | schedule(); | |
1087 | ||
1088 | return 0; | |
1089 | } | |
1090 | ||
1091 | /* | |
1092 | * Do various things that may trigger events. | |
1093 | */ | |
1094 | static __init void event_test_stuff(void) | |
1095 | { | |
1096 | struct task_struct *test_thread; | |
1097 | ||
1098 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1099 | msleep(1); | |
1100 | kthread_stop(test_thread); | |
1101 | } | |
1102 | ||
1103 | /* | |
1104 | * For every trace event defined, we will test each trace point separately, | |
1105 | * and then by groups, and finally all trace points. | |
1106 | */ | |
9ea21c1e | 1107 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1108 | { |
1109 | struct ftrace_event_call *call; | |
1110 | struct event_subsystem *system; | |
1111 | char *sysname; | |
1112 | int ret; | |
1113 | ||
1114 | pr_info("Running tests on trace events:\n"); | |
1115 | ||
1116 | list_for_each_entry(call, &ftrace_events, list) { | |
1117 | ||
1118 | /* Only test those that have a regfunc */ | |
1119 | if (!call->regfunc) | |
1120 | continue; | |
1121 | ||
1122 | pr_info("Testing event %s: ", call->name); | |
1123 | ||
1124 | /* | |
1125 | * If an event is already enabled, someone is using | |
1126 | * it and the self test should not be on. | |
1127 | */ | |
1128 | if (call->enabled) { | |
1129 | pr_warning("Enabled event during self test!\n"); | |
1130 | WARN_ON_ONCE(1); | |
1131 | continue; | |
1132 | } | |
1133 | ||
1134 | call->enabled = 1; | |
1135 | call->regfunc(); | |
1136 | ||
1137 | event_test_stuff(); | |
1138 | ||
1139 | call->unregfunc(); | |
1140 | call->enabled = 0; | |
1141 | ||
1142 | pr_cont("OK\n"); | |
1143 | } | |
1144 | ||
1145 | /* Now test at the sub system level */ | |
1146 | ||
1147 | pr_info("Running tests on trace event systems:\n"); | |
1148 | ||
1149 | list_for_each_entry(system, &event_subsystems, list) { | |
1150 | ||
1151 | /* the ftrace system is special, skip it */ | |
1152 | if (strcmp(system->name, "ftrace") == 0) | |
1153 | continue; | |
1154 | ||
1155 | pr_info("Testing event system %s: ", system->name); | |
1156 | ||
1157 | /* ftrace_set_clr_event can modify the name passed in. */ | |
1158 | sysname = kstrdup(system->name, GFP_KERNEL); | |
1159 | if (WARN_ON(!sysname)) { | |
1160 | pr_warning("Can't allocate memory, giving up!\n"); | |
9ea21c1e | 1161 | return; |
e6187007 SR |
1162 | } |
1163 | ret = ftrace_set_clr_event(sysname, 1); | |
1164 | kfree(sysname); | |
1165 | if (WARN_ON_ONCE(ret)) { | |
1166 | pr_warning("error enabling system %s\n", | |
1167 | system->name); | |
1168 | continue; | |
1169 | } | |
1170 | ||
1171 | event_test_stuff(); | |
1172 | ||
1173 | sysname = kstrdup(system->name, GFP_KERNEL); | |
1174 | if (WARN_ON(!sysname)) { | |
1175 | pr_warning("Can't allocate memory, giving up!\n"); | |
9ea21c1e | 1176 | return; |
e6187007 SR |
1177 | } |
1178 | ret = ftrace_set_clr_event(sysname, 0); | |
1179 | kfree(sysname); | |
1180 | ||
1181 | if (WARN_ON_ONCE(ret)) | |
1182 | pr_warning("error disabling system %s\n", | |
1183 | system->name); | |
1184 | ||
1185 | pr_cont("OK\n"); | |
1186 | } | |
1187 | ||
1188 | /* Test with all events enabled */ | |
1189 | ||
1190 | pr_info("Running tests on all trace events:\n"); | |
1191 | pr_info("Testing all events: "); | |
1192 | ||
1193 | sysname = kmalloc(4, GFP_KERNEL); | |
1194 | if (WARN_ON(!sysname)) { | |
1195 | pr_warning("Can't allocate memory, giving up!\n"); | |
9ea21c1e | 1196 | return; |
e6187007 SR |
1197 | } |
1198 | memcpy(sysname, "*:*", 4); | |
1199 | ret = ftrace_set_clr_event(sysname, 1); | |
1200 | if (WARN_ON_ONCE(ret)) { | |
1201 | kfree(sysname); | |
1202 | pr_warning("error enabling all events\n"); | |
9ea21c1e | 1203 | return; |
e6187007 SR |
1204 | } |
1205 | ||
1206 | event_test_stuff(); | |
1207 | ||
1208 | /* reset sysname */ | |
1209 | memcpy(sysname, "*:*", 4); | |
1210 | ret = ftrace_set_clr_event(sysname, 0); | |
1211 | kfree(sysname); | |
1212 | ||
1213 | if (WARN_ON_ONCE(ret)) { | |
1214 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1215 | return; |
e6187007 SR |
1216 | } |
1217 | ||
1218 | pr_cont("OK\n"); | |
9ea21c1e SR |
1219 | } |
1220 | ||
1221 | #ifdef CONFIG_FUNCTION_TRACER | |
1222 | ||
1223 | static DEFINE_PER_CPU(atomic_t, test_event_disable); | |
1224 | ||
1225 | static void | |
1226 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1227 | { | |
1228 | struct ring_buffer_event *event; | |
1229 | struct ftrace_entry *entry; | |
1230 | unsigned long flags; | |
1231 | long disabled; | |
1232 | int resched; | |
1233 | int cpu; | |
1234 | int pc; | |
1235 | ||
1236 | pc = preempt_count(); | |
1237 | resched = ftrace_preempt_disable(); | |
1238 | cpu = raw_smp_processor_id(); | |
1239 | disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu)); | |
1240 | ||
1241 | if (disabled != 1) | |
1242 | goto out; | |
1243 | ||
1244 | local_save_flags(flags); | |
1245 | ||
1246 | event = trace_current_buffer_lock_reserve(TRACE_FN, sizeof(*entry), | |
1247 | flags, pc); | |
1248 | if (!event) | |
1249 | goto out; | |
1250 | entry = ring_buffer_event_data(event); | |
1251 | entry->ip = ip; | |
1252 | entry->parent_ip = parent_ip; | |
1253 | ||
cb4764a6 | 1254 | trace_nowake_buffer_unlock_commit(event, flags, pc); |
9ea21c1e SR |
1255 | |
1256 | out: | |
1257 | atomic_dec(&per_cpu(test_event_disable, cpu)); | |
1258 | ftrace_preempt_enable(resched); | |
1259 | } | |
1260 | ||
1261 | static struct ftrace_ops trace_ops __initdata = | |
1262 | { | |
1263 | .func = function_test_events_call, | |
1264 | }; | |
1265 | ||
1266 | static __init void event_trace_self_test_with_function(void) | |
1267 | { | |
1268 | register_ftrace_function(&trace_ops); | |
1269 | pr_info("Running tests again, along with the function tracer\n"); | |
1270 | event_trace_self_tests(); | |
1271 | unregister_ftrace_function(&trace_ops); | |
1272 | } | |
1273 | #else | |
1274 | static __init void event_trace_self_test_with_function(void) | |
1275 | { | |
1276 | } | |
1277 | #endif | |
1278 | ||
1279 | static __init int event_trace_self_tests_init(void) | |
1280 | { | |
1281 | ||
1282 | event_trace_self_tests(); | |
1283 | ||
1284 | event_trace_self_test_with_function(); | |
e6187007 SR |
1285 | |
1286 | return 0; | |
1287 | } | |
1288 | ||
28d20e2d | 1289 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1290 | |
1291 | #endif |