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Commit | Line | Data |
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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 | ||
8f31bfe5 LZ |
114 | /* |
115 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
116 | */ | |
117 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
118 | const char *event, int set) | |
b77e38aa | 119 | { |
a59fd602 | 120 | struct ftrace_event_call *call; |
29f93943 | 121 | int ret = -EINVAL; |
8f31bfe5 LZ |
122 | |
123 | mutex_lock(&event_mutex); | |
124 | list_for_each_entry(call, &ftrace_events, list) { | |
125 | ||
126 | if (!call->name || !call->regfunc) | |
127 | continue; | |
128 | ||
129 | if (match && | |
130 | strcmp(match, call->name) != 0 && | |
131 | strcmp(match, call->system) != 0) | |
132 | continue; | |
133 | ||
134 | if (sub && strcmp(sub, call->system) != 0) | |
135 | continue; | |
136 | ||
137 | if (event && strcmp(event, call->name) != 0) | |
138 | continue; | |
139 | ||
140 | ftrace_event_enable_disable(call, set); | |
141 | ||
142 | ret = 0; | |
143 | } | |
144 | mutex_unlock(&event_mutex); | |
145 | ||
146 | return ret; | |
147 | } | |
148 | ||
149 | static int ftrace_set_clr_event(char *buf, int set) | |
150 | { | |
b628b3e6 | 151 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
152 | |
153 | /* | |
154 | * The buf format can be <subsystem>:<event-name> | |
155 | * *:<event-name> means any event by that name. | |
156 | * :<event-name> is the same. | |
157 | * | |
158 | * <subsystem>:* means all events in that subsystem | |
159 | * <subsystem>: means the same. | |
160 | * | |
161 | * <name> (no ':') means all events in a subsystem with | |
162 | * the name <name> or any event that matches <name> | |
163 | */ | |
164 | ||
165 | match = strsep(&buf, ":"); | |
166 | if (buf) { | |
167 | sub = match; | |
168 | event = buf; | |
169 | match = NULL; | |
170 | ||
171 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
172 | sub = NULL; | |
173 | if (!strlen(event) || strcmp(event, "*") == 0) | |
174 | event = NULL; | |
175 | } | |
b77e38aa | 176 | |
8f31bfe5 | 177 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
178 | } |
179 | ||
4671c794 SR |
180 | /** |
181 | * trace_set_clr_event - enable or disable an event | |
182 | * @system: system name to match (NULL for any system) | |
183 | * @event: event name to match (NULL for all events, within system) | |
184 | * @set: 1 to enable, 0 to disable | |
185 | * | |
186 | * This is a way for other parts of the kernel to enable or disable | |
187 | * event recording. | |
188 | * | |
189 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
190 | * registered events. | |
191 | */ | |
192 | int trace_set_clr_event(const char *system, const char *event, int set) | |
193 | { | |
194 | return __ftrace_set_clr_event(NULL, system, event, set); | |
195 | } | |
196 | ||
b77e38aa SR |
197 | /* 128 should be much more than enough */ |
198 | #define EVENT_BUF_SIZE 127 | |
199 | ||
200 | static ssize_t | |
201 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
202 | size_t cnt, loff_t *ppos) | |
203 | { | |
204 | size_t read = 0; | |
205 | int i, set = 1; | |
206 | ssize_t ret; | |
207 | char *buf; | |
208 | char ch; | |
209 | ||
210 | if (!cnt || cnt < 0) | |
211 | return 0; | |
212 | ||
1852fcce SR |
213 | ret = tracing_update_buffers(); |
214 | if (ret < 0) | |
215 | return ret; | |
216 | ||
b77e38aa SR |
217 | ret = get_user(ch, ubuf++); |
218 | if (ret) | |
219 | return ret; | |
220 | read++; | |
221 | cnt--; | |
222 | ||
223 | /* skip white space */ | |
224 | while (cnt && isspace(ch)) { | |
225 | ret = get_user(ch, ubuf++); | |
226 | if (ret) | |
227 | return ret; | |
228 | read++; | |
229 | cnt--; | |
230 | } | |
231 | ||
232 | /* Only white space found? */ | |
233 | if (isspace(ch)) { | |
234 | file->f_pos += read; | |
235 | ret = read; | |
236 | return ret; | |
237 | } | |
238 | ||
239 | buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL); | |
240 | if (!buf) | |
241 | return -ENOMEM; | |
242 | ||
243 | if (cnt > EVENT_BUF_SIZE) | |
244 | cnt = EVENT_BUF_SIZE; | |
245 | ||
246 | i = 0; | |
247 | while (cnt && !isspace(ch)) { | |
248 | if (!i && ch == '!') | |
249 | set = 0; | |
250 | else | |
251 | buf[i++] = ch; | |
252 | ||
253 | ret = get_user(ch, ubuf++); | |
254 | if (ret) | |
255 | goto out_free; | |
256 | read++; | |
257 | cnt--; | |
258 | } | |
259 | buf[i] = 0; | |
260 | ||
261 | file->f_pos += read; | |
262 | ||
263 | ret = ftrace_set_clr_event(buf, set); | |
264 | if (ret) | |
265 | goto out_free; | |
266 | ||
267 | ret = read; | |
268 | ||
269 | out_free: | |
270 | kfree(buf); | |
271 | ||
272 | return ret; | |
273 | } | |
274 | ||
275 | static void * | |
276 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
277 | { | |
a59fd602 SR |
278 | struct list_head *list = m->private; |
279 | struct ftrace_event_call *call; | |
b77e38aa SR |
280 | |
281 | (*pos)++; | |
282 | ||
40e26815 | 283 | for (;;) { |
a59fd602 | 284 | if (list == &ftrace_events) |
40e26815 SR |
285 | return NULL; |
286 | ||
a59fd602 SR |
287 | call = list_entry(list, struct ftrace_event_call, list); |
288 | ||
40e26815 SR |
289 | /* |
290 | * The ftrace subsystem is for showing formats only. | |
291 | * They can not be enabled or disabled via the event files. | |
292 | */ | |
293 | if (call->regfunc) | |
294 | break; | |
295 | ||
a59fd602 | 296 | list = list->next; |
40e26815 | 297 | } |
b77e38aa | 298 | |
a59fd602 | 299 | m->private = list->next; |
b77e38aa SR |
300 | |
301 | return call; | |
302 | } | |
303 | ||
304 | static void *t_start(struct seq_file *m, loff_t *pos) | |
305 | { | |
20c8928a LZ |
306 | mutex_lock(&event_mutex); |
307 | if (*pos == 0) | |
308 | m->private = ftrace_events.next; | |
b77e38aa SR |
309 | return t_next(m, NULL, pos); |
310 | } | |
311 | ||
312 | static void * | |
313 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
314 | { | |
a59fd602 SR |
315 | struct list_head *list = m->private; |
316 | struct ftrace_event_call *call; | |
b77e38aa SR |
317 | |
318 | (*pos)++; | |
319 | ||
320 | retry: | |
a59fd602 | 321 | if (list == &ftrace_events) |
b77e38aa SR |
322 | return NULL; |
323 | ||
a59fd602 SR |
324 | call = list_entry(list, struct ftrace_event_call, list); |
325 | ||
b77e38aa | 326 | if (!call->enabled) { |
a59fd602 | 327 | list = list->next; |
b77e38aa SR |
328 | goto retry; |
329 | } | |
330 | ||
a59fd602 | 331 | m->private = list->next; |
b77e38aa SR |
332 | |
333 | return call; | |
334 | } | |
335 | ||
336 | static void *s_start(struct seq_file *m, loff_t *pos) | |
337 | { | |
20c8928a LZ |
338 | mutex_lock(&event_mutex); |
339 | if (*pos == 0) | |
340 | m->private = ftrace_events.next; | |
b77e38aa SR |
341 | return s_next(m, NULL, pos); |
342 | } | |
343 | ||
344 | static int t_show(struct seq_file *m, void *v) | |
345 | { | |
346 | struct ftrace_event_call *call = v; | |
347 | ||
b628b3e6 SR |
348 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
349 | seq_printf(m, "%s:", call->system); | |
b77e38aa SR |
350 | seq_printf(m, "%s\n", call->name); |
351 | ||
352 | return 0; | |
353 | } | |
354 | ||
355 | static void t_stop(struct seq_file *m, void *p) | |
356 | { | |
20c8928a | 357 | mutex_unlock(&event_mutex); |
b77e38aa SR |
358 | } |
359 | ||
360 | static int | |
361 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
362 | { | |
b77e38aa SR |
363 | const struct seq_operations *seq_ops; |
364 | ||
365 | if ((file->f_mode & FMODE_WRITE) && | |
366 | !(file->f_flags & O_APPEND)) | |
367 | ftrace_clear_events(); | |
368 | ||
369 | seq_ops = inode->i_private; | |
20c8928a | 370 | return seq_open(file, seq_ops); |
b77e38aa SR |
371 | } |
372 | ||
1473e441 SR |
373 | static ssize_t |
374 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
375 | loff_t *ppos) | |
376 | { | |
377 | struct ftrace_event_call *call = filp->private_data; | |
378 | char *buf; | |
379 | ||
da4d0302 | 380 | if (call->enabled) |
1473e441 SR |
381 | buf = "1\n"; |
382 | else | |
383 | buf = "0\n"; | |
384 | ||
385 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
386 | } | |
387 | ||
388 | static ssize_t | |
389 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
390 | loff_t *ppos) | |
391 | { | |
392 | struct ftrace_event_call *call = filp->private_data; | |
393 | char buf[64]; | |
394 | unsigned long val; | |
395 | int ret; | |
396 | ||
397 | if (cnt >= sizeof(buf)) | |
398 | return -EINVAL; | |
399 | ||
400 | if (copy_from_user(&buf, ubuf, cnt)) | |
401 | return -EFAULT; | |
402 | ||
403 | buf[cnt] = 0; | |
404 | ||
405 | ret = strict_strtoul(buf, 10, &val); | |
406 | if (ret < 0) | |
407 | return ret; | |
408 | ||
1852fcce SR |
409 | ret = tracing_update_buffers(); |
410 | if (ret < 0) | |
411 | return ret; | |
412 | ||
1473e441 SR |
413 | switch (val) { |
414 | case 0: | |
1473e441 | 415 | case 1: |
11a241a3 | 416 | mutex_lock(&event_mutex); |
fd994989 | 417 | ftrace_event_enable_disable(call, val); |
11a241a3 | 418 | mutex_unlock(&event_mutex); |
1473e441 SR |
419 | break; |
420 | ||
421 | default: | |
422 | return -EINVAL; | |
423 | } | |
424 | ||
425 | *ppos += cnt; | |
426 | ||
427 | return cnt; | |
428 | } | |
429 | ||
8ae79a13 SR |
430 | static ssize_t |
431 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
432 | loff_t *ppos) | |
433 | { | |
c142b15d | 434 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
435 | const char *system = filp->private_data; |
436 | struct ftrace_event_call *call; | |
437 | char buf[2]; | |
c142b15d | 438 | int set = 0; |
8ae79a13 SR |
439 | int ret; |
440 | ||
8ae79a13 SR |
441 | mutex_lock(&event_mutex); |
442 | list_for_each_entry(call, &ftrace_events, list) { | |
443 | if (!call->name || !call->regfunc) | |
444 | continue; | |
445 | ||
8f31bfe5 | 446 | if (system && strcmp(call->system, system) != 0) |
8ae79a13 SR |
447 | continue; |
448 | ||
449 | /* | |
450 | * We need to find out if all the events are set | |
451 | * or if all events or cleared, or if we have | |
452 | * a mixture. | |
453 | */ | |
c142b15d LZ |
454 | set |= (1 << !!call->enabled); |
455 | ||
8ae79a13 SR |
456 | /* |
457 | * If we have a mixture, no need to look further. | |
458 | */ | |
c142b15d | 459 | if (set == 3) |
8ae79a13 SR |
460 | break; |
461 | } | |
462 | mutex_unlock(&event_mutex); | |
463 | ||
c142b15d | 464 | buf[0] = set_to_char[set]; |
8ae79a13 | 465 | buf[1] = '\n'; |
8ae79a13 SR |
466 | |
467 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
468 | ||
469 | return ret; | |
470 | } | |
471 | ||
472 | static ssize_t | |
473 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
474 | loff_t *ppos) | |
475 | { | |
476 | const char *system = filp->private_data; | |
477 | unsigned long val; | |
8ae79a13 SR |
478 | char buf[64]; |
479 | ssize_t ret; | |
480 | ||
481 | if (cnt >= sizeof(buf)) | |
482 | return -EINVAL; | |
483 | ||
484 | if (copy_from_user(&buf, ubuf, cnt)) | |
485 | return -EFAULT; | |
486 | ||
487 | buf[cnt] = 0; | |
488 | ||
489 | ret = strict_strtoul(buf, 10, &val); | |
490 | if (ret < 0) | |
491 | return ret; | |
492 | ||
493 | ret = tracing_update_buffers(); | |
494 | if (ret < 0) | |
495 | return ret; | |
496 | ||
8f31bfe5 | 497 | if (val != 0 && val != 1) |
8ae79a13 | 498 | return -EINVAL; |
8ae79a13 | 499 | |
8f31bfe5 | 500 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 501 | if (ret) |
8f31bfe5 | 502 | goto out; |
8ae79a13 SR |
503 | |
504 | ret = cnt; | |
505 | ||
8f31bfe5 | 506 | out: |
8ae79a13 SR |
507 | *ppos += cnt; |
508 | ||
509 | return ret; | |
510 | } | |
511 | ||
75db37d2 SR |
512 | extern char *__bad_type_size(void); |
513 | ||
91729ef9 | 514 | #undef FIELD |
156b5f17 | 515 | #define FIELD(type, name) \ |
75db37d2 | 516 | sizeof(type) != sizeof(field.name) ? __bad_type_size() : \ |
cf027f64 TZ |
517 | #type, "common_" #name, offsetof(typeof(field), name), \ |
518 | sizeof(field.name) | |
91729ef9 SR |
519 | |
520 | static int trace_write_header(struct trace_seq *s) | |
521 | { | |
522 | struct trace_entry field; | |
523 | ||
524 | /* struct trace_entry */ | |
525 | return trace_seq_printf(s, | |
ce8eb2bf SR |
526 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" |
527 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
528 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
529 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
530 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
91729ef9 | 531 | "\n", |
89ec0dee | 532 | FIELD(unsigned short, type), |
91729ef9 SR |
533 | FIELD(unsigned char, flags), |
534 | FIELD(unsigned char, preempt_count), | |
535 | FIELD(int, pid), | |
536 | FIELD(int, tgid)); | |
537 | } | |
da4d0302 | 538 | |
981d081e SR |
539 | static ssize_t |
540 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
541 | loff_t *ppos) | |
542 | { | |
543 | struct ftrace_event_call *call = filp->private_data; | |
544 | struct trace_seq *s; | |
545 | char *buf; | |
546 | int r; | |
547 | ||
c269fc8c TZ |
548 | if (*ppos) |
549 | return 0; | |
550 | ||
981d081e SR |
551 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
552 | if (!s) | |
553 | return -ENOMEM; | |
554 | ||
555 | trace_seq_init(s); | |
556 | ||
c5e4e192 SR |
557 | /* If any of the first writes fail, so will the show_format. */ |
558 | ||
559 | trace_seq_printf(s, "name: %s\n", call->name); | |
560 | trace_seq_printf(s, "ID: %d\n", call->id); | |
561 | trace_seq_printf(s, "format:\n"); | |
91729ef9 SR |
562 | trace_write_header(s); |
563 | ||
981d081e SR |
564 | r = call->show_format(s); |
565 | if (!r) { | |
566 | /* | |
567 | * ug! The format output is bigger than a PAGE!! | |
568 | */ | |
569 | buf = "FORMAT TOO BIG\n"; | |
570 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
571 | buf, strlen(buf)); | |
572 | goto out; | |
573 | } | |
574 | ||
575 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
576 | s->buffer, s->len); | |
577 | out: | |
578 | kfree(s); | |
579 | return r; | |
580 | } | |
581 | ||
23725aee PZ |
582 | static ssize_t |
583 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
584 | { | |
585 | struct ftrace_event_call *call = filp->private_data; | |
586 | struct trace_seq *s; | |
587 | int r; | |
588 | ||
589 | if (*ppos) | |
590 | return 0; | |
591 | ||
592 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
593 | if (!s) | |
594 | return -ENOMEM; | |
595 | ||
596 | trace_seq_init(s); | |
597 | trace_seq_printf(s, "%d\n", call->id); | |
598 | ||
599 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
600 | s->buffer, s->len); | |
601 | kfree(s); | |
602 | return r; | |
603 | } | |
604 | ||
7ce7e424 TZ |
605 | static ssize_t |
606 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
607 | loff_t *ppos) | |
608 | { | |
609 | struct ftrace_event_call *call = filp->private_data; | |
610 | struct trace_seq *s; | |
611 | int r; | |
612 | ||
613 | if (*ppos) | |
614 | return 0; | |
615 | ||
616 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
617 | if (!s) | |
618 | return -ENOMEM; | |
619 | ||
620 | trace_seq_init(s); | |
621 | ||
8b372562 | 622 | print_event_filter(call, s); |
4bda2d51 | 623 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
624 | |
625 | kfree(s); | |
626 | ||
627 | return r; | |
628 | } | |
629 | ||
630 | static ssize_t | |
631 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
632 | loff_t *ppos) | |
633 | { | |
634 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 635 | char *buf; |
7ce7e424 TZ |
636 | int err; |
637 | ||
8b372562 | 638 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
639 | return -EINVAL; |
640 | ||
8b372562 TZ |
641 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
642 | if (!buf) | |
7ce7e424 TZ |
643 | return -ENOMEM; |
644 | ||
8b372562 TZ |
645 | if (copy_from_user(buf, ubuf, cnt)) { |
646 | free_page((unsigned long) buf); | |
647 | return -EFAULT; | |
7ce7e424 | 648 | } |
8b372562 | 649 | buf[cnt] = '\0'; |
7ce7e424 | 650 | |
8b372562 TZ |
651 | err = apply_event_filter(call, buf); |
652 | free_page((unsigned long) buf); | |
653 | if (err < 0) | |
44e9c8b7 | 654 | return err; |
0a19e53c | 655 | |
7ce7e424 TZ |
656 | *ppos += cnt; |
657 | ||
658 | return cnt; | |
659 | } | |
660 | ||
cfb180f3 TZ |
661 | static ssize_t |
662 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
663 | loff_t *ppos) | |
664 | { | |
665 | struct event_subsystem *system = filp->private_data; | |
666 | struct trace_seq *s; | |
667 | int r; | |
668 | ||
669 | if (*ppos) | |
670 | return 0; | |
671 | ||
672 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
673 | if (!s) | |
674 | return -ENOMEM; | |
675 | ||
676 | trace_seq_init(s); | |
677 | ||
8b372562 | 678 | print_subsystem_event_filter(system, s); |
4bda2d51 | 679 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
680 | |
681 | kfree(s); | |
682 | ||
683 | return r; | |
684 | } | |
685 | ||
686 | static ssize_t | |
687 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
688 | loff_t *ppos) | |
689 | { | |
690 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 691 | char *buf; |
cfb180f3 TZ |
692 | int err; |
693 | ||
8b372562 | 694 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
695 | return -EINVAL; |
696 | ||
8b372562 TZ |
697 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
698 | if (!buf) | |
cfb180f3 TZ |
699 | return -ENOMEM; |
700 | ||
8b372562 TZ |
701 | if (copy_from_user(buf, ubuf, cnt)) { |
702 | free_page((unsigned long) buf); | |
703 | return -EFAULT; | |
cfb180f3 | 704 | } |
8b372562 | 705 | buf[cnt] = '\0'; |
cfb180f3 | 706 | |
8b372562 TZ |
707 | err = apply_subsystem_event_filter(system, buf); |
708 | free_page((unsigned long) buf); | |
709 | if (err < 0) | |
44e9c8b7 | 710 | return err; |
cfb180f3 TZ |
711 | |
712 | *ppos += cnt; | |
713 | ||
714 | return cnt; | |
715 | } | |
716 | ||
d1b182a8 SR |
717 | static ssize_t |
718 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
719 | { | |
720 | int (*func)(struct trace_seq *s) = filp->private_data; | |
721 | struct trace_seq *s; | |
722 | int r; | |
723 | ||
724 | if (*ppos) | |
725 | return 0; | |
726 | ||
727 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
728 | if (!s) | |
729 | return -ENOMEM; | |
730 | ||
731 | trace_seq_init(s); | |
732 | ||
733 | func(s); | |
734 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
735 | ||
736 | kfree(s); | |
737 | ||
738 | return r; | |
739 | } | |
740 | ||
b77e38aa SR |
741 | static const struct seq_operations show_event_seq_ops = { |
742 | .start = t_start, | |
743 | .next = t_next, | |
744 | .show = t_show, | |
745 | .stop = t_stop, | |
746 | }; | |
747 | ||
748 | static const struct seq_operations show_set_event_seq_ops = { | |
749 | .start = s_start, | |
750 | .next = s_next, | |
751 | .show = t_show, | |
752 | .stop = t_stop, | |
753 | }; | |
754 | ||
2314c4ae SR |
755 | static const struct file_operations ftrace_avail_fops = { |
756 | .open = ftrace_event_seq_open, | |
757 | .read = seq_read, | |
758 | .llseek = seq_lseek, | |
759 | .release = seq_release, | |
760 | }; | |
761 | ||
b77e38aa SR |
762 | static const struct file_operations ftrace_set_event_fops = { |
763 | .open = ftrace_event_seq_open, | |
764 | .read = seq_read, | |
765 | .write = ftrace_event_write, | |
766 | .llseek = seq_lseek, | |
767 | .release = seq_release, | |
768 | }; | |
769 | ||
1473e441 SR |
770 | static const struct file_operations ftrace_enable_fops = { |
771 | .open = tracing_open_generic, | |
772 | .read = event_enable_read, | |
773 | .write = event_enable_write, | |
774 | }; | |
775 | ||
981d081e SR |
776 | static const struct file_operations ftrace_event_format_fops = { |
777 | .open = tracing_open_generic, | |
778 | .read = event_format_read, | |
779 | }; | |
780 | ||
23725aee PZ |
781 | static const struct file_operations ftrace_event_id_fops = { |
782 | .open = tracing_open_generic, | |
783 | .read = event_id_read, | |
784 | }; | |
785 | ||
7ce7e424 TZ |
786 | static const struct file_operations ftrace_event_filter_fops = { |
787 | .open = tracing_open_generic, | |
788 | .read = event_filter_read, | |
789 | .write = event_filter_write, | |
790 | }; | |
791 | ||
cfb180f3 TZ |
792 | static const struct file_operations ftrace_subsystem_filter_fops = { |
793 | .open = tracing_open_generic, | |
794 | .read = subsystem_filter_read, | |
795 | .write = subsystem_filter_write, | |
796 | }; | |
797 | ||
8ae79a13 SR |
798 | static const struct file_operations ftrace_system_enable_fops = { |
799 | .open = tracing_open_generic, | |
800 | .read = system_enable_read, | |
801 | .write = system_enable_write, | |
802 | }; | |
803 | ||
d1b182a8 SR |
804 | static const struct file_operations ftrace_show_header_fops = { |
805 | .open = tracing_open_generic, | |
806 | .read = show_header, | |
807 | }; | |
808 | ||
1473e441 SR |
809 | static struct dentry *event_trace_events_dir(void) |
810 | { | |
811 | static struct dentry *d_tracer; | |
812 | static struct dentry *d_events; | |
813 | ||
814 | if (d_events) | |
815 | return d_events; | |
816 | ||
817 | d_tracer = tracing_init_dentry(); | |
818 | if (!d_tracer) | |
819 | return NULL; | |
820 | ||
821 | d_events = debugfs_create_dir("events", d_tracer); | |
822 | if (!d_events) | |
823 | pr_warning("Could not create debugfs " | |
824 | "'events' directory\n"); | |
825 | ||
826 | return d_events; | |
827 | } | |
828 | ||
6ecc2d1c SR |
829 | static LIST_HEAD(event_subsystems); |
830 | ||
831 | static struct dentry * | |
832 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
833 | { | |
834 | struct event_subsystem *system; | |
e1112b4d | 835 | struct dentry *entry; |
6ecc2d1c SR |
836 | |
837 | /* First see if we did not already create this dir */ | |
838 | list_for_each_entry(system, &event_subsystems, list) { | |
839 | if (strcmp(system->name, name) == 0) | |
840 | return system->entry; | |
841 | } | |
842 | ||
843 | /* need to create new entry */ | |
844 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
845 | if (!system) { | |
846 | pr_warning("No memory to create event subsystem %s\n", | |
847 | name); | |
848 | return d_events; | |
849 | } | |
850 | ||
851 | system->entry = debugfs_create_dir(name, d_events); | |
852 | if (!system->entry) { | |
853 | pr_warning("Could not create event subsystem %s\n", | |
854 | name); | |
855 | kfree(system); | |
856 | return d_events; | |
857 | } | |
858 | ||
6d723736 SR |
859 | system->name = kstrdup(name, GFP_KERNEL); |
860 | if (!system->name) { | |
861 | debugfs_remove(system->entry); | |
862 | kfree(system); | |
863 | return d_events; | |
864 | } | |
865 | ||
6ecc2d1c SR |
866 | list_add(&system->list, &event_subsystems); |
867 | ||
30e673b2 | 868 | system->filter = NULL; |
cfb180f3 | 869 | |
8b372562 TZ |
870 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
871 | if (!system->filter) { | |
872 | pr_warning("Could not allocate filter for subsystem " | |
873 | "'%s'\n", name); | |
874 | return system->entry; | |
875 | } | |
876 | ||
e1112b4d TZ |
877 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
878 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
879 | if (!entry) { |
880 | kfree(system->filter); | |
881 | system->filter = NULL; | |
e1112b4d TZ |
882 | pr_warning("Could not create debugfs " |
883 | "'%s/filter' entry\n", name); | |
8b372562 | 884 | } |
e1112b4d | 885 | |
8ae79a13 SR |
886 | entry = trace_create_file("enable", 0644, system->entry, |
887 | (void *)system->name, | |
888 | &ftrace_system_enable_fops); | |
889 | ||
6ecc2d1c SR |
890 | return system->entry; |
891 | } | |
892 | ||
1473e441 | 893 | static int |
701970b3 SR |
894 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
895 | const struct file_operations *id, | |
896 | const struct file_operations *enable, | |
897 | const struct file_operations *filter, | |
898 | const struct file_operations *format) | |
1473e441 SR |
899 | { |
900 | struct dentry *entry; | |
fd994989 | 901 | int ret; |
1473e441 | 902 | |
6ecc2d1c SR |
903 | /* |
904 | * If the trace point header did not define TRACE_SYSTEM | |
905 | * then the system would be called "TRACE_SYSTEM". | |
906 | */ | |
6d723736 | 907 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
6ecc2d1c SR |
908 | d_events = event_subsystem_dir(call->system, d_events); |
909 | ||
fd994989 SR |
910 | if (call->raw_init) { |
911 | ret = call->raw_init(); | |
912 | if (ret < 0) { | |
913 | pr_warning("Could not initialize trace point" | |
914 | " events/%s\n", call->name); | |
915 | return ret; | |
916 | } | |
917 | } | |
918 | ||
1473e441 SR |
919 | call->dir = debugfs_create_dir(call->name, d_events); |
920 | if (!call->dir) { | |
921 | pr_warning("Could not create debugfs " | |
922 | "'%s' directory\n", call->name); | |
923 | return -1; | |
924 | } | |
925 | ||
6d723736 SR |
926 | if (call->regfunc) |
927 | entry = trace_create_file("enable", 0644, call->dir, call, | |
701970b3 | 928 | enable); |
1473e441 | 929 | |
6d723736 SR |
930 | if (call->id) |
931 | entry = trace_create_file("id", 0444, call->dir, call, | |
701970b3 | 932 | id); |
23725aee | 933 | |
cf027f64 TZ |
934 | if (call->define_fields) { |
935 | ret = call->define_fields(); | |
936 | if (ret < 0) { | |
937 | pr_warning("Could not initialize trace point" | |
938 | " events/%s\n", call->name); | |
939 | return ret; | |
940 | } | |
6d723736 | 941 | entry = trace_create_file("filter", 0644, call->dir, call, |
701970b3 | 942 | filter); |
cf027f64 TZ |
943 | } |
944 | ||
981d081e SR |
945 | /* A trace may not want to export its format */ |
946 | if (!call->show_format) | |
947 | return 0; | |
948 | ||
6d723736 | 949 | entry = trace_create_file("format", 0444, call->dir, call, |
701970b3 | 950 | format); |
6d723736 SR |
951 | |
952 | return 0; | |
953 | } | |
954 | ||
955 | #define for_each_event(event, start, end) \ | |
956 | for (event = start; \ | |
957 | (unsigned long)event < (unsigned long)end; \ | |
958 | event++) | |
959 | ||
61f919a1 | 960 | #ifdef CONFIG_MODULES |
701970b3 SR |
961 | |
962 | static LIST_HEAD(ftrace_module_file_list); | |
963 | ||
964 | /* | |
965 | * Modules must own their file_operations to keep up with | |
966 | * reference counting. | |
967 | */ | |
968 | struct ftrace_module_file_ops { | |
969 | struct list_head list; | |
970 | struct module *mod; | |
971 | struct file_operations id; | |
972 | struct file_operations enable; | |
973 | struct file_operations format; | |
974 | struct file_operations filter; | |
975 | }; | |
976 | ||
977 | static struct ftrace_module_file_ops * | |
978 | trace_create_file_ops(struct module *mod) | |
979 | { | |
980 | struct ftrace_module_file_ops *file_ops; | |
981 | ||
982 | /* | |
983 | * This is a bit of a PITA. To allow for correct reference | |
984 | * counting, modules must "own" their file_operations. | |
985 | * To do this, we allocate the file operations that will be | |
986 | * used in the event directory. | |
987 | */ | |
988 | ||
989 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
990 | if (!file_ops) | |
991 | return NULL; | |
992 | ||
993 | file_ops->mod = mod; | |
994 | ||
995 | file_ops->id = ftrace_event_id_fops; | |
996 | file_ops->id.owner = mod; | |
997 | ||
998 | file_ops->enable = ftrace_enable_fops; | |
999 | file_ops->enable.owner = mod; | |
1000 | ||
1001 | file_ops->filter = ftrace_event_filter_fops; | |
1002 | file_ops->filter.owner = mod; | |
1003 | ||
1004 | file_ops->format = ftrace_event_format_fops; | |
1005 | file_ops->format.owner = mod; | |
1006 | ||
1007 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1008 | ||
1009 | return file_ops; | |
1010 | } | |
1011 | ||
6d723736 SR |
1012 | static void trace_module_add_events(struct module *mod) |
1013 | { | |
701970b3 | 1014 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
1015 | struct ftrace_event_call *call, *start, *end; |
1016 | struct dentry *d_events; | |
1017 | ||
1018 | start = mod->trace_events; | |
1019 | end = mod->trace_events + mod->num_trace_events; | |
1020 | ||
1021 | if (start == end) | |
1022 | return; | |
1023 | ||
1024 | d_events = event_trace_events_dir(); | |
1025 | if (!d_events) | |
1026 | return; | |
1027 | ||
1028 | for_each_event(call, start, end) { | |
1029 | /* The linker may leave blanks */ | |
1030 | if (!call->name) | |
1031 | continue; | |
701970b3 SR |
1032 | |
1033 | /* | |
1034 | * This module has events, create file ops for this module | |
1035 | * if not already done. | |
1036 | */ | |
1037 | if (!file_ops) { | |
1038 | file_ops = trace_create_file_ops(mod); | |
1039 | if (!file_ops) | |
1040 | return; | |
1041 | } | |
6d723736 SR |
1042 | call->mod = mod; |
1043 | list_add(&call->list, &ftrace_events); | |
701970b3 SR |
1044 | event_create_dir(call, d_events, |
1045 | &file_ops->id, &file_ops->enable, | |
1046 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1047 | } |
1048 | } | |
1049 | ||
1050 | static void trace_module_remove_events(struct module *mod) | |
1051 | { | |
701970b3 | 1052 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1053 | struct ftrace_event_call *call, *p; |
9456f0fa | 1054 | bool found = false; |
6d723736 SR |
1055 | |
1056 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
1057 | if (call->mod == mod) { | |
9456f0fa | 1058 | found = true; |
6d723736 SR |
1059 | if (call->enabled) { |
1060 | call->enabled = 0; | |
1061 | call->unregfunc(); | |
1062 | } | |
1063 | if (call->event) | |
1064 | unregister_ftrace_event(call->event); | |
1065 | debugfs_remove_recursive(call->dir); | |
1066 | list_del(&call->list); | |
2df75e41 LZ |
1067 | trace_destroy_fields(call); |
1068 | destroy_preds(call); | |
6d723736 SR |
1069 | } |
1070 | } | |
701970b3 SR |
1071 | |
1072 | /* Now free the file_operations */ | |
1073 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1074 | if (file_ops->mod == mod) | |
1075 | break; | |
1076 | } | |
1077 | if (&file_ops->list != &ftrace_module_file_list) { | |
1078 | list_del(&file_ops->list); | |
1079 | kfree(file_ops); | |
1080 | } | |
9456f0fa SR |
1081 | |
1082 | /* | |
1083 | * It is safest to reset the ring buffer if the module being unloaded | |
1084 | * registered any events. | |
1085 | */ | |
1086 | if (found) | |
1087 | tracing_reset_current_online_cpus(); | |
6d723736 SR |
1088 | } |
1089 | ||
61f919a1 SR |
1090 | static int trace_module_notify(struct notifier_block *self, |
1091 | unsigned long val, void *data) | |
6d723736 SR |
1092 | { |
1093 | struct module *mod = data; | |
1094 | ||
1095 | mutex_lock(&event_mutex); | |
1096 | switch (val) { | |
1097 | case MODULE_STATE_COMING: | |
1098 | trace_module_add_events(mod); | |
1099 | break; | |
1100 | case MODULE_STATE_GOING: | |
1101 | trace_module_remove_events(mod); | |
1102 | break; | |
1103 | } | |
1104 | mutex_unlock(&event_mutex); | |
fd994989 | 1105 | |
1473e441 SR |
1106 | return 0; |
1107 | } | |
61f919a1 SR |
1108 | #else |
1109 | static int trace_module_notify(struct notifier_block *self, | |
1110 | unsigned long val, void *data) | |
1111 | { | |
1112 | return 0; | |
1113 | } | |
1114 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1115 | |
6d723736 SR |
1116 | struct notifier_block trace_module_nb = { |
1117 | .notifier_call = trace_module_notify, | |
1118 | .priority = 0, | |
1119 | }; | |
1120 | ||
a59fd602 SR |
1121 | extern struct ftrace_event_call __start_ftrace_events[]; |
1122 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
1123 | ||
b77e38aa SR |
1124 | static __init int event_trace_init(void) |
1125 | { | |
a59fd602 | 1126 | struct ftrace_event_call *call; |
b77e38aa SR |
1127 | struct dentry *d_tracer; |
1128 | struct dentry *entry; | |
1473e441 | 1129 | struct dentry *d_events; |
6d723736 | 1130 | int ret; |
b77e38aa SR |
1131 | |
1132 | d_tracer = tracing_init_dentry(); | |
1133 | if (!d_tracer) | |
1134 | return 0; | |
1135 | ||
2314c4ae SR |
1136 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1137 | (void *)&show_event_seq_ops, | |
1138 | &ftrace_avail_fops); | |
1139 | if (!entry) | |
1140 | pr_warning("Could not create debugfs " | |
1141 | "'available_events' entry\n"); | |
1142 | ||
b77e38aa SR |
1143 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1144 | (void *)&show_set_event_seq_ops, | |
1145 | &ftrace_set_event_fops); | |
1146 | if (!entry) | |
1147 | pr_warning("Could not create debugfs " | |
1148 | "'set_event' entry\n"); | |
1149 | ||
1473e441 SR |
1150 | d_events = event_trace_events_dir(); |
1151 | if (!d_events) | |
1152 | return 0; | |
1153 | ||
d1b182a8 SR |
1154 | /* ring buffer internal formats */ |
1155 | trace_create_file("header_page", 0444, d_events, | |
1156 | ring_buffer_print_page_header, | |
1157 | &ftrace_show_header_fops); | |
1158 | ||
1159 | trace_create_file("header_event", 0444, d_events, | |
1160 | ring_buffer_print_entry_header, | |
1161 | &ftrace_show_header_fops); | |
1162 | ||
8ae79a13 | 1163 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1164 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1165 | |
6d723736 | 1166 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1167 | /* The linker may leave blanks */ |
1168 | if (!call->name) | |
1169 | continue; | |
a59fd602 | 1170 | list_add(&call->list, &ftrace_events); |
701970b3 SR |
1171 | event_create_dir(call, d_events, &ftrace_event_id_fops, |
1172 | &ftrace_enable_fops, &ftrace_event_filter_fops, | |
1173 | &ftrace_event_format_fops); | |
1473e441 SR |
1174 | } |
1175 | ||
6d723736 SR |
1176 | ret = register_module_notifier(&trace_module_nb); |
1177 | if (!ret) | |
1178 | pr_warning("Failed to register trace events module notifier\n"); | |
1179 | ||
b77e38aa SR |
1180 | return 0; |
1181 | } | |
1182 | fs_initcall(event_trace_init); | |
e6187007 SR |
1183 | |
1184 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1185 | ||
1186 | static DEFINE_SPINLOCK(test_spinlock); | |
1187 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1188 | static DEFINE_MUTEX(test_mutex); | |
1189 | ||
1190 | static __init void test_work(struct work_struct *dummy) | |
1191 | { | |
1192 | spin_lock(&test_spinlock); | |
1193 | spin_lock_irq(&test_spinlock_irq); | |
1194 | udelay(1); | |
1195 | spin_unlock_irq(&test_spinlock_irq); | |
1196 | spin_unlock(&test_spinlock); | |
1197 | ||
1198 | mutex_lock(&test_mutex); | |
1199 | msleep(1); | |
1200 | mutex_unlock(&test_mutex); | |
1201 | } | |
1202 | ||
1203 | static __init int event_test_thread(void *unused) | |
1204 | { | |
1205 | void *test_malloc; | |
1206 | ||
1207 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1208 | if (!test_malloc) | |
1209 | pr_info("failed to kmalloc\n"); | |
1210 | ||
1211 | schedule_on_each_cpu(test_work); | |
1212 | ||
1213 | kfree(test_malloc); | |
1214 | ||
1215 | set_current_state(TASK_INTERRUPTIBLE); | |
1216 | while (!kthread_should_stop()) | |
1217 | schedule(); | |
1218 | ||
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * Do various things that may trigger events. | |
1224 | */ | |
1225 | static __init void event_test_stuff(void) | |
1226 | { | |
1227 | struct task_struct *test_thread; | |
1228 | ||
1229 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1230 | msleep(1); | |
1231 | kthread_stop(test_thread); | |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * For every trace event defined, we will test each trace point separately, | |
1236 | * and then by groups, and finally all trace points. | |
1237 | */ | |
9ea21c1e | 1238 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1239 | { |
1240 | struct ftrace_event_call *call; | |
1241 | struct event_subsystem *system; | |
e6187007 SR |
1242 | int ret; |
1243 | ||
1244 | pr_info("Running tests on trace events:\n"); | |
1245 | ||
1246 | list_for_each_entry(call, &ftrace_events, list) { | |
1247 | ||
1248 | /* Only test those that have a regfunc */ | |
1249 | if (!call->regfunc) | |
1250 | continue; | |
1251 | ||
1252 | pr_info("Testing event %s: ", call->name); | |
1253 | ||
1254 | /* | |
1255 | * If an event is already enabled, someone is using | |
1256 | * it and the self test should not be on. | |
1257 | */ | |
1258 | if (call->enabled) { | |
1259 | pr_warning("Enabled event during self test!\n"); | |
1260 | WARN_ON_ONCE(1); | |
1261 | continue; | |
1262 | } | |
1263 | ||
1264 | call->enabled = 1; | |
1265 | call->regfunc(); | |
1266 | ||
1267 | event_test_stuff(); | |
1268 | ||
1269 | call->unregfunc(); | |
1270 | call->enabled = 0; | |
1271 | ||
1272 | pr_cont("OK\n"); | |
1273 | } | |
1274 | ||
1275 | /* Now test at the sub system level */ | |
1276 | ||
1277 | pr_info("Running tests on trace event systems:\n"); | |
1278 | ||
1279 | list_for_each_entry(system, &event_subsystems, list) { | |
1280 | ||
1281 | /* the ftrace system is special, skip it */ | |
1282 | if (strcmp(system->name, "ftrace") == 0) | |
1283 | continue; | |
1284 | ||
1285 | pr_info("Testing event system %s: ", system->name); | |
1286 | ||
8f31bfe5 | 1287 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1288 | if (WARN_ON_ONCE(ret)) { |
1289 | pr_warning("error enabling system %s\n", | |
1290 | system->name); | |
1291 | continue; | |
1292 | } | |
1293 | ||
1294 | event_test_stuff(); | |
1295 | ||
8f31bfe5 | 1296 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1297 | if (WARN_ON_ONCE(ret)) |
1298 | pr_warning("error disabling system %s\n", | |
1299 | system->name); | |
1300 | ||
1301 | pr_cont("OK\n"); | |
1302 | } | |
1303 | ||
1304 | /* Test with all events enabled */ | |
1305 | ||
1306 | pr_info("Running tests on all trace events:\n"); | |
1307 | pr_info("Testing all events: "); | |
1308 | ||
8f31bfe5 | 1309 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1310 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1311 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1312 | return; |
e6187007 SR |
1313 | } |
1314 | ||
1315 | event_test_stuff(); | |
1316 | ||
1317 | /* reset sysname */ | |
8f31bfe5 | 1318 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1319 | if (WARN_ON_ONCE(ret)) { |
1320 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1321 | return; |
e6187007 SR |
1322 | } |
1323 | ||
1324 | pr_cont("OK\n"); | |
9ea21c1e SR |
1325 | } |
1326 | ||
1327 | #ifdef CONFIG_FUNCTION_TRACER | |
1328 | ||
1329 | static DEFINE_PER_CPU(atomic_t, test_event_disable); | |
1330 | ||
1331 | static void | |
1332 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1333 | { | |
1334 | struct ring_buffer_event *event; | |
1335 | struct ftrace_entry *entry; | |
1336 | unsigned long flags; | |
1337 | long disabled; | |
1338 | int resched; | |
1339 | int cpu; | |
1340 | int pc; | |
1341 | ||
1342 | pc = preempt_count(); | |
1343 | resched = ftrace_preempt_disable(); | |
1344 | cpu = raw_smp_processor_id(); | |
1345 | disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu)); | |
1346 | ||
1347 | if (disabled != 1) | |
1348 | goto out; | |
1349 | ||
1350 | local_save_flags(flags); | |
1351 | ||
1352 | event = trace_current_buffer_lock_reserve(TRACE_FN, sizeof(*entry), | |
1353 | flags, pc); | |
1354 | if (!event) | |
1355 | goto out; | |
1356 | entry = ring_buffer_event_data(event); | |
1357 | entry->ip = ip; | |
1358 | entry->parent_ip = parent_ip; | |
1359 | ||
cb4764a6 | 1360 | trace_nowake_buffer_unlock_commit(event, flags, pc); |
9ea21c1e SR |
1361 | |
1362 | out: | |
1363 | atomic_dec(&per_cpu(test_event_disable, cpu)); | |
1364 | ftrace_preempt_enable(resched); | |
1365 | } | |
1366 | ||
1367 | static struct ftrace_ops trace_ops __initdata = | |
1368 | { | |
1369 | .func = function_test_events_call, | |
1370 | }; | |
1371 | ||
1372 | static __init void event_trace_self_test_with_function(void) | |
1373 | { | |
1374 | register_ftrace_function(&trace_ops); | |
1375 | pr_info("Running tests again, along with the function tracer\n"); | |
1376 | event_trace_self_tests(); | |
1377 | unregister_ftrace_function(&trace_ops); | |
1378 | } | |
1379 | #else | |
1380 | static __init void event_trace_self_test_with_function(void) | |
1381 | { | |
1382 | } | |
1383 | #endif | |
1384 | ||
1385 | static __init int event_trace_self_tests_init(void) | |
1386 | { | |
1387 | ||
1388 | event_trace_self_tests(); | |
1389 | ||
1390 | event_trace_self_test_with_function(); | |
e6187007 SR |
1391 | |
1392 | return 0; | |
1393 | } | |
1394 | ||
28d20e2d | 1395 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1396 | |
1397 | #endif |