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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 | ||
fd994989 SR |
79 | static void ftrace_event_enable_disable(struct ftrace_event_call *call, |
80 | int enable) | |
81 | { | |
fd994989 SR |
82 | switch (enable) { |
83 | case 0: | |
84 | if (call->enabled) { | |
85 | call->enabled = 0; | |
b11c53e1 | 86 | tracing_stop_cmdline_record(); |
fd994989 SR |
87 | call->unregfunc(); |
88 | } | |
fd994989 SR |
89 | break; |
90 | case 1: | |
da4d0302 | 91 | if (!call->enabled) { |
fd994989 | 92 | call->enabled = 1; |
b11c53e1 | 93 | tracing_start_cmdline_record(); |
fd994989 SR |
94 | call->regfunc(); |
95 | } | |
fd994989 SR |
96 | break; |
97 | } | |
98 | } | |
99 | ||
0e907c99 Z |
100 | static void ftrace_clear_events(void) |
101 | { | |
102 | struct ftrace_event_call *call; | |
103 | ||
104 | mutex_lock(&event_mutex); | |
105 | list_for_each_entry(call, &ftrace_events, list) { | |
106 | ftrace_event_enable_disable(call, 0); | |
107 | } | |
108 | mutex_unlock(&event_mutex); | |
109 | } | |
110 | ||
8f31bfe5 LZ |
111 | /* |
112 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
113 | */ | |
114 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
115 | const char *event, int set) | |
b77e38aa | 116 | { |
a59fd602 | 117 | struct ftrace_event_call *call; |
29f93943 | 118 | int ret = -EINVAL; |
8f31bfe5 LZ |
119 | |
120 | mutex_lock(&event_mutex); | |
121 | list_for_each_entry(call, &ftrace_events, list) { | |
122 | ||
123 | if (!call->name || !call->regfunc) | |
124 | continue; | |
125 | ||
126 | if (match && | |
127 | strcmp(match, call->name) != 0 && | |
128 | strcmp(match, call->system) != 0) | |
129 | continue; | |
130 | ||
131 | if (sub && strcmp(sub, call->system) != 0) | |
132 | continue; | |
133 | ||
134 | if (event && strcmp(event, call->name) != 0) | |
135 | continue; | |
136 | ||
137 | ftrace_event_enable_disable(call, set); | |
138 | ||
139 | ret = 0; | |
140 | } | |
141 | mutex_unlock(&event_mutex); | |
142 | ||
143 | return ret; | |
144 | } | |
145 | ||
146 | static int ftrace_set_clr_event(char *buf, int set) | |
147 | { | |
b628b3e6 | 148 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
149 | |
150 | /* | |
151 | * The buf format can be <subsystem>:<event-name> | |
152 | * *:<event-name> means any event by that name. | |
153 | * :<event-name> is the same. | |
154 | * | |
155 | * <subsystem>:* means all events in that subsystem | |
156 | * <subsystem>: means the same. | |
157 | * | |
158 | * <name> (no ':') means all events in a subsystem with | |
159 | * the name <name> or any event that matches <name> | |
160 | */ | |
161 | ||
162 | match = strsep(&buf, ":"); | |
163 | if (buf) { | |
164 | sub = match; | |
165 | event = buf; | |
166 | match = NULL; | |
167 | ||
168 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
169 | sub = NULL; | |
170 | if (!strlen(event) || strcmp(event, "*") == 0) | |
171 | event = NULL; | |
172 | } | |
b77e38aa | 173 | |
8f31bfe5 | 174 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
175 | } |
176 | ||
4671c794 SR |
177 | /** |
178 | * trace_set_clr_event - enable or disable an event | |
179 | * @system: system name to match (NULL for any system) | |
180 | * @event: event name to match (NULL for all events, within system) | |
181 | * @set: 1 to enable, 0 to disable | |
182 | * | |
183 | * This is a way for other parts of the kernel to enable or disable | |
184 | * event recording. | |
185 | * | |
186 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
187 | * registered events. | |
188 | */ | |
189 | int trace_set_clr_event(const char *system, const char *event, int set) | |
190 | { | |
191 | return __ftrace_set_clr_event(NULL, system, event, set); | |
192 | } | |
193 | ||
b77e38aa SR |
194 | /* 128 should be much more than enough */ |
195 | #define EVENT_BUF_SIZE 127 | |
196 | ||
197 | static ssize_t | |
198 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
199 | size_t cnt, loff_t *ppos) | |
200 | { | |
201 | size_t read = 0; | |
202 | int i, set = 1; | |
203 | ssize_t ret; | |
204 | char *buf; | |
205 | char ch; | |
206 | ||
207 | if (!cnt || cnt < 0) | |
208 | return 0; | |
209 | ||
1852fcce SR |
210 | ret = tracing_update_buffers(); |
211 | if (ret < 0) | |
212 | return ret; | |
213 | ||
b77e38aa SR |
214 | ret = get_user(ch, ubuf++); |
215 | if (ret) | |
216 | return ret; | |
217 | read++; | |
218 | cnt--; | |
219 | ||
220 | /* skip white space */ | |
221 | while (cnt && isspace(ch)) { | |
222 | ret = get_user(ch, ubuf++); | |
223 | if (ret) | |
224 | return ret; | |
225 | read++; | |
226 | cnt--; | |
227 | } | |
228 | ||
229 | /* Only white space found? */ | |
230 | if (isspace(ch)) { | |
231 | file->f_pos += read; | |
232 | ret = read; | |
233 | return ret; | |
234 | } | |
235 | ||
236 | buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL); | |
237 | if (!buf) | |
238 | return -ENOMEM; | |
239 | ||
240 | if (cnt > EVENT_BUF_SIZE) | |
241 | cnt = EVENT_BUF_SIZE; | |
242 | ||
243 | i = 0; | |
244 | while (cnt && !isspace(ch)) { | |
245 | if (!i && ch == '!') | |
246 | set = 0; | |
247 | else | |
248 | buf[i++] = ch; | |
249 | ||
250 | ret = get_user(ch, ubuf++); | |
251 | if (ret) | |
252 | goto out_free; | |
253 | read++; | |
254 | cnt--; | |
255 | } | |
256 | buf[i] = 0; | |
257 | ||
258 | file->f_pos += read; | |
259 | ||
260 | ret = ftrace_set_clr_event(buf, set); | |
261 | if (ret) | |
262 | goto out_free; | |
263 | ||
264 | ret = read; | |
265 | ||
266 | out_free: | |
267 | kfree(buf); | |
268 | ||
269 | return ret; | |
270 | } | |
271 | ||
272 | static void * | |
273 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
274 | { | |
a59fd602 SR |
275 | struct list_head *list = m->private; |
276 | struct ftrace_event_call *call; | |
b77e38aa SR |
277 | |
278 | (*pos)++; | |
279 | ||
40e26815 | 280 | for (;;) { |
a59fd602 | 281 | if (list == &ftrace_events) |
40e26815 SR |
282 | return NULL; |
283 | ||
a59fd602 SR |
284 | call = list_entry(list, struct ftrace_event_call, list); |
285 | ||
40e26815 SR |
286 | /* |
287 | * The ftrace subsystem is for showing formats only. | |
288 | * They can not be enabled or disabled via the event files. | |
289 | */ | |
290 | if (call->regfunc) | |
291 | break; | |
292 | ||
a59fd602 | 293 | list = list->next; |
40e26815 | 294 | } |
b77e38aa | 295 | |
a59fd602 | 296 | m->private = list->next; |
b77e38aa SR |
297 | |
298 | return call; | |
299 | } | |
300 | ||
301 | static void *t_start(struct seq_file *m, loff_t *pos) | |
302 | { | |
e1c7e2a6 LZ |
303 | struct ftrace_event_call *call = NULL; |
304 | loff_t l; | |
305 | ||
20c8928a | 306 | mutex_lock(&event_mutex); |
e1c7e2a6 LZ |
307 | |
308 | m->private = ftrace_events.next; | |
309 | for (l = 0; l <= *pos; ) { | |
310 | call = t_next(m, NULL, &l); | |
311 | if (!call) | |
312 | break; | |
313 | } | |
314 | return call; | |
b77e38aa SR |
315 | } |
316 | ||
317 | static void * | |
318 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
319 | { | |
a59fd602 SR |
320 | struct list_head *list = m->private; |
321 | struct ftrace_event_call *call; | |
b77e38aa SR |
322 | |
323 | (*pos)++; | |
324 | ||
325 | retry: | |
a59fd602 | 326 | if (list == &ftrace_events) |
b77e38aa SR |
327 | return NULL; |
328 | ||
a59fd602 SR |
329 | call = list_entry(list, struct ftrace_event_call, list); |
330 | ||
b77e38aa | 331 | if (!call->enabled) { |
a59fd602 | 332 | list = list->next; |
b77e38aa SR |
333 | goto retry; |
334 | } | |
335 | ||
a59fd602 | 336 | m->private = list->next; |
b77e38aa SR |
337 | |
338 | return call; | |
339 | } | |
340 | ||
341 | static void *s_start(struct seq_file *m, loff_t *pos) | |
342 | { | |
e1c7e2a6 LZ |
343 | struct ftrace_event_call *call = NULL; |
344 | loff_t l; | |
345 | ||
20c8928a | 346 | mutex_lock(&event_mutex); |
e1c7e2a6 LZ |
347 | |
348 | m->private = ftrace_events.next; | |
349 | for (l = 0; l <= *pos; ) { | |
350 | call = s_next(m, NULL, &l); | |
351 | if (!call) | |
352 | break; | |
353 | } | |
354 | return call; | |
b77e38aa SR |
355 | } |
356 | ||
357 | static int t_show(struct seq_file *m, void *v) | |
358 | { | |
359 | struct ftrace_event_call *call = v; | |
360 | ||
b628b3e6 SR |
361 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
362 | seq_printf(m, "%s:", call->system); | |
b77e38aa SR |
363 | seq_printf(m, "%s\n", call->name); |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | static void t_stop(struct seq_file *m, void *p) | |
369 | { | |
20c8928a | 370 | mutex_unlock(&event_mutex); |
b77e38aa SR |
371 | } |
372 | ||
373 | static int | |
374 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
375 | { | |
b77e38aa SR |
376 | const struct seq_operations *seq_ops; |
377 | ||
378 | if ((file->f_mode & FMODE_WRITE) && | |
379 | !(file->f_flags & O_APPEND)) | |
380 | ftrace_clear_events(); | |
381 | ||
382 | seq_ops = inode->i_private; | |
20c8928a | 383 | return seq_open(file, seq_ops); |
b77e38aa SR |
384 | } |
385 | ||
1473e441 SR |
386 | static ssize_t |
387 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
388 | loff_t *ppos) | |
389 | { | |
390 | struct ftrace_event_call *call = filp->private_data; | |
391 | char *buf; | |
392 | ||
da4d0302 | 393 | if (call->enabled) |
1473e441 SR |
394 | buf = "1\n"; |
395 | else | |
396 | buf = "0\n"; | |
397 | ||
398 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
399 | } | |
400 | ||
401 | static ssize_t | |
402 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
403 | loff_t *ppos) | |
404 | { | |
405 | struct ftrace_event_call *call = filp->private_data; | |
406 | char buf[64]; | |
407 | unsigned long val; | |
408 | int ret; | |
409 | ||
410 | if (cnt >= sizeof(buf)) | |
411 | return -EINVAL; | |
412 | ||
413 | if (copy_from_user(&buf, ubuf, cnt)) | |
414 | return -EFAULT; | |
415 | ||
416 | buf[cnt] = 0; | |
417 | ||
418 | ret = strict_strtoul(buf, 10, &val); | |
419 | if (ret < 0) | |
420 | return ret; | |
421 | ||
1852fcce SR |
422 | ret = tracing_update_buffers(); |
423 | if (ret < 0) | |
424 | return ret; | |
425 | ||
1473e441 SR |
426 | switch (val) { |
427 | case 0: | |
1473e441 | 428 | case 1: |
11a241a3 | 429 | mutex_lock(&event_mutex); |
fd994989 | 430 | ftrace_event_enable_disable(call, val); |
11a241a3 | 431 | mutex_unlock(&event_mutex); |
1473e441 SR |
432 | break; |
433 | ||
434 | default: | |
435 | return -EINVAL; | |
436 | } | |
437 | ||
438 | *ppos += cnt; | |
439 | ||
440 | return cnt; | |
441 | } | |
442 | ||
8ae79a13 SR |
443 | static ssize_t |
444 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
445 | loff_t *ppos) | |
446 | { | |
c142b15d | 447 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
448 | const char *system = filp->private_data; |
449 | struct ftrace_event_call *call; | |
450 | char buf[2]; | |
c142b15d | 451 | int set = 0; |
8ae79a13 SR |
452 | int ret; |
453 | ||
8ae79a13 SR |
454 | mutex_lock(&event_mutex); |
455 | list_for_each_entry(call, &ftrace_events, list) { | |
456 | if (!call->name || !call->regfunc) | |
457 | continue; | |
458 | ||
8f31bfe5 | 459 | if (system && strcmp(call->system, system) != 0) |
8ae79a13 SR |
460 | continue; |
461 | ||
462 | /* | |
463 | * We need to find out if all the events are set | |
464 | * or if all events or cleared, or if we have | |
465 | * a mixture. | |
466 | */ | |
c142b15d LZ |
467 | set |= (1 << !!call->enabled); |
468 | ||
8ae79a13 SR |
469 | /* |
470 | * If we have a mixture, no need to look further. | |
471 | */ | |
c142b15d | 472 | if (set == 3) |
8ae79a13 SR |
473 | break; |
474 | } | |
475 | mutex_unlock(&event_mutex); | |
476 | ||
c142b15d | 477 | buf[0] = set_to_char[set]; |
8ae79a13 | 478 | buf[1] = '\n'; |
8ae79a13 SR |
479 | |
480 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
481 | ||
482 | return ret; | |
483 | } | |
484 | ||
485 | static ssize_t | |
486 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
487 | loff_t *ppos) | |
488 | { | |
489 | const char *system = filp->private_data; | |
490 | unsigned long val; | |
8ae79a13 SR |
491 | char buf[64]; |
492 | ssize_t ret; | |
493 | ||
494 | if (cnt >= sizeof(buf)) | |
495 | return -EINVAL; | |
496 | ||
497 | if (copy_from_user(&buf, ubuf, cnt)) | |
498 | return -EFAULT; | |
499 | ||
500 | buf[cnt] = 0; | |
501 | ||
502 | ret = strict_strtoul(buf, 10, &val); | |
503 | if (ret < 0) | |
504 | return ret; | |
505 | ||
506 | ret = tracing_update_buffers(); | |
507 | if (ret < 0) | |
508 | return ret; | |
509 | ||
8f31bfe5 | 510 | if (val != 0 && val != 1) |
8ae79a13 | 511 | return -EINVAL; |
8ae79a13 | 512 | |
8f31bfe5 | 513 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 514 | if (ret) |
8f31bfe5 | 515 | goto out; |
8ae79a13 SR |
516 | |
517 | ret = cnt; | |
518 | ||
8f31bfe5 | 519 | out: |
8ae79a13 SR |
520 | *ppos += cnt; |
521 | ||
522 | return ret; | |
523 | } | |
524 | ||
75db37d2 SR |
525 | extern char *__bad_type_size(void); |
526 | ||
91729ef9 | 527 | #undef FIELD |
156b5f17 | 528 | #define FIELD(type, name) \ |
75db37d2 | 529 | sizeof(type) != sizeof(field.name) ? __bad_type_size() : \ |
cf027f64 TZ |
530 | #type, "common_" #name, offsetof(typeof(field), name), \ |
531 | sizeof(field.name) | |
91729ef9 SR |
532 | |
533 | static int trace_write_header(struct trace_seq *s) | |
534 | { | |
535 | struct trace_entry field; | |
536 | ||
537 | /* struct trace_entry */ | |
538 | return trace_seq_printf(s, | |
ce8eb2bf SR |
539 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" |
540 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
541 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
542 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
543 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
91729ef9 | 544 | "\n", |
89ec0dee | 545 | FIELD(unsigned short, type), |
91729ef9 SR |
546 | FIELD(unsigned char, flags), |
547 | FIELD(unsigned char, preempt_count), | |
548 | FIELD(int, pid), | |
549 | FIELD(int, tgid)); | |
550 | } | |
da4d0302 | 551 | |
981d081e SR |
552 | static ssize_t |
553 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
554 | loff_t *ppos) | |
555 | { | |
556 | struct ftrace_event_call *call = filp->private_data; | |
557 | struct trace_seq *s; | |
558 | char *buf; | |
559 | int r; | |
560 | ||
c269fc8c TZ |
561 | if (*ppos) |
562 | return 0; | |
563 | ||
981d081e SR |
564 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
565 | if (!s) | |
566 | return -ENOMEM; | |
567 | ||
568 | trace_seq_init(s); | |
569 | ||
c5e4e192 SR |
570 | /* If any of the first writes fail, so will the show_format. */ |
571 | ||
572 | trace_seq_printf(s, "name: %s\n", call->name); | |
573 | trace_seq_printf(s, "ID: %d\n", call->id); | |
574 | trace_seq_printf(s, "format:\n"); | |
91729ef9 SR |
575 | trace_write_header(s); |
576 | ||
981d081e SR |
577 | r = call->show_format(s); |
578 | if (!r) { | |
579 | /* | |
580 | * ug! The format output is bigger than a PAGE!! | |
581 | */ | |
582 | buf = "FORMAT TOO BIG\n"; | |
583 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
584 | buf, strlen(buf)); | |
585 | goto out; | |
586 | } | |
587 | ||
588 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
589 | s->buffer, s->len); | |
590 | out: | |
591 | kfree(s); | |
592 | return r; | |
593 | } | |
594 | ||
23725aee PZ |
595 | static ssize_t |
596 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
597 | { | |
598 | struct ftrace_event_call *call = filp->private_data; | |
599 | struct trace_seq *s; | |
600 | int r; | |
601 | ||
602 | if (*ppos) | |
603 | return 0; | |
604 | ||
605 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
606 | if (!s) | |
607 | return -ENOMEM; | |
608 | ||
609 | trace_seq_init(s); | |
610 | trace_seq_printf(s, "%d\n", call->id); | |
611 | ||
612 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
613 | s->buffer, s->len); | |
614 | kfree(s); | |
615 | return r; | |
616 | } | |
617 | ||
7ce7e424 TZ |
618 | static ssize_t |
619 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
620 | loff_t *ppos) | |
621 | { | |
622 | struct ftrace_event_call *call = filp->private_data; | |
623 | struct trace_seq *s; | |
624 | int r; | |
625 | ||
626 | if (*ppos) | |
627 | return 0; | |
628 | ||
629 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
630 | if (!s) | |
631 | return -ENOMEM; | |
632 | ||
633 | trace_seq_init(s); | |
634 | ||
8b372562 | 635 | print_event_filter(call, s); |
4bda2d51 | 636 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
637 | |
638 | kfree(s); | |
639 | ||
640 | return r; | |
641 | } | |
642 | ||
643 | static ssize_t | |
644 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
645 | loff_t *ppos) | |
646 | { | |
647 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 648 | char *buf; |
7ce7e424 TZ |
649 | int err; |
650 | ||
8b372562 | 651 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
652 | return -EINVAL; |
653 | ||
8b372562 TZ |
654 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
655 | if (!buf) | |
7ce7e424 TZ |
656 | return -ENOMEM; |
657 | ||
8b372562 TZ |
658 | if (copy_from_user(buf, ubuf, cnt)) { |
659 | free_page((unsigned long) buf); | |
660 | return -EFAULT; | |
7ce7e424 | 661 | } |
8b372562 | 662 | buf[cnt] = '\0'; |
7ce7e424 | 663 | |
8b372562 TZ |
664 | err = apply_event_filter(call, buf); |
665 | free_page((unsigned long) buf); | |
666 | if (err < 0) | |
44e9c8b7 | 667 | return err; |
0a19e53c | 668 | |
7ce7e424 TZ |
669 | *ppos += cnt; |
670 | ||
671 | return cnt; | |
672 | } | |
673 | ||
cfb180f3 TZ |
674 | static ssize_t |
675 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
676 | loff_t *ppos) | |
677 | { | |
678 | struct event_subsystem *system = filp->private_data; | |
679 | struct trace_seq *s; | |
680 | int r; | |
681 | ||
682 | if (*ppos) | |
683 | return 0; | |
684 | ||
685 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
686 | if (!s) | |
687 | return -ENOMEM; | |
688 | ||
689 | trace_seq_init(s); | |
690 | ||
8b372562 | 691 | print_subsystem_event_filter(system, s); |
4bda2d51 | 692 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
693 | |
694 | kfree(s); | |
695 | ||
696 | return r; | |
697 | } | |
698 | ||
699 | static ssize_t | |
700 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
701 | loff_t *ppos) | |
702 | { | |
703 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 704 | char *buf; |
cfb180f3 TZ |
705 | int err; |
706 | ||
8b372562 | 707 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
708 | return -EINVAL; |
709 | ||
8b372562 TZ |
710 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
711 | if (!buf) | |
cfb180f3 TZ |
712 | return -ENOMEM; |
713 | ||
8b372562 TZ |
714 | if (copy_from_user(buf, ubuf, cnt)) { |
715 | free_page((unsigned long) buf); | |
716 | return -EFAULT; | |
cfb180f3 | 717 | } |
8b372562 | 718 | buf[cnt] = '\0'; |
cfb180f3 | 719 | |
8b372562 TZ |
720 | err = apply_subsystem_event_filter(system, buf); |
721 | free_page((unsigned long) buf); | |
722 | if (err < 0) | |
44e9c8b7 | 723 | return err; |
cfb180f3 TZ |
724 | |
725 | *ppos += cnt; | |
726 | ||
727 | return cnt; | |
728 | } | |
729 | ||
d1b182a8 SR |
730 | static ssize_t |
731 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
732 | { | |
733 | int (*func)(struct trace_seq *s) = filp->private_data; | |
734 | struct trace_seq *s; | |
735 | int r; | |
736 | ||
737 | if (*ppos) | |
738 | return 0; | |
739 | ||
740 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
741 | if (!s) | |
742 | return -ENOMEM; | |
743 | ||
744 | trace_seq_init(s); | |
745 | ||
746 | func(s); | |
747 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
748 | ||
749 | kfree(s); | |
750 | ||
751 | return r; | |
752 | } | |
753 | ||
b77e38aa SR |
754 | static const struct seq_operations show_event_seq_ops = { |
755 | .start = t_start, | |
756 | .next = t_next, | |
757 | .show = t_show, | |
758 | .stop = t_stop, | |
759 | }; | |
760 | ||
761 | static const struct seq_operations show_set_event_seq_ops = { | |
762 | .start = s_start, | |
763 | .next = s_next, | |
764 | .show = t_show, | |
765 | .stop = t_stop, | |
766 | }; | |
767 | ||
2314c4ae SR |
768 | static const struct file_operations ftrace_avail_fops = { |
769 | .open = ftrace_event_seq_open, | |
770 | .read = seq_read, | |
771 | .llseek = seq_lseek, | |
772 | .release = seq_release, | |
773 | }; | |
774 | ||
b77e38aa SR |
775 | static const struct file_operations ftrace_set_event_fops = { |
776 | .open = ftrace_event_seq_open, | |
777 | .read = seq_read, | |
778 | .write = ftrace_event_write, | |
779 | .llseek = seq_lseek, | |
780 | .release = seq_release, | |
781 | }; | |
782 | ||
1473e441 SR |
783 | static const struct file_operations ftrace_enable_fops = { |
784 | .open = tracing_open_generic, | |
785 | .read = event_enable_read, | |
786 | .write = event_enable_write, | |
787 | }; | |
788 | ||
981d081e SR |
789 | static const struct file_operations ftrace_event_format_fops = { |
790 | .open = tracing_open_generic, | |
791 | .read = event_format_read, | |
792 | }; | |
793 | ||
23725aee PZ |
794 | static const struct file_operations ftrace_event_id_fops = { |
795 | .open = tracing_open_generic, | |
796 | .read = event_id_read, | |
797 | }; | |
798 | ||
7ce7e424 TZ |
799 | static const struct file_operations ftrace_event_filter_fops = { |
800 | .open = tracing_open_generic, | |
801 | .read = event_filter_read, | |
802 | .write = event_filter_write, | |
803 | }; | |
804 | ||
cfb180f3 TZ |
805 | static const struct file_operations ftrace_subsystem_filter_fops = { |
806 | .open = tracing_open_generic, | |
807 | .read = subsystem_filter_read, | |
808 | .write = subsystem_filter_write, | |
809 | }; | |
810 | ||
8ae79a13 SR |
811 | static const struct file_operations ftrace_system_enable_fops = { |
812 | .open = tracing_open_generic, | |
813 | .read = system_enable_read, | |
814 | .write = system_enable_write, | |
815 | }; | |
816 | ||
d1b182a8 SR |
817 | static const struct file_operations ftrace_show_header_fops = { |
818 | .open = tracing_open_generic, | |
819 | .read = show_header, | |
820 | }; | |
821 | ||
1473e441 SR |
822 | static struct dentry *event_trace_events_dir(void) |
823 | { | |
824 | static struct dentry *d_tracer; | |
825 | static struct dentry *d_events; | |
826 | ||
827 | if (d_events) | |
828 | return d_events; | |
829 | ||
830 | d_tracer = tracing_init_dentry(); | |
831 | if (!d_tracer) | |
832 | return NULL; | |
833 | ||
834 | d_events = debugfs_create_dir("events", d_tracer); | |
835 | if (!d_events) | |
836 | pr_warning("Could not create debugfs " | |
837 | "'events' directory\n"); | |
838 | ||
839 | return d_events; | |
840 | } | |
841 | ||
6ecc2d1c SR |
842 | static LIST_HEAD(event_subsystems); |
843 | ||
844 | static struct dentry * | |
845 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
846 | { | |
847 | struct event_subsystem *system; | |
e1112b4d | 848 | struct dentry *entry; |
6ecc2d1c SR |
849 | |
850 | /* First see if we did not already create this dir */ | |
851 | list_for_each_entry(system, &event_subsystems, list) { | |
852 | if (strcmp(system->name, name) == 0) | |
853 | return system->entry; | |
854 | } | |
855 | ||
856 | /* need to create new entry */ | |
857 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
858 | if (!system) { | |
859 | pr_warning("No memory to create event subsystem %s\n", | |
860 | name); | |
861 | return d_events; | |
862 | } | |
863 | ||
864 | system->entry = debugfs_create_dir(name, d_events); | |
865 | if (!system->entry) { | |
866 | pr_warning("Could not create event subsystem %s\n", | |
867 | name); | |
868 | kfree(system); | |
869 | return d_events; | |
870 | } | |
871 | ||
6d723736 SR |
872 | system->name = kstrdup(name, GFP_KERNEL); |
873 | if (!system->name) { | |
874 | debugfs_remove(system->entry); | |
875 | kfree(system); | |
876 | return d_events; | |
877 | } | |
878 | ||
6ecc2d1c SR |
879 | list_add(&system->list, &event_subsystems); |
880 | ||
30e673b2 | 881 | system->filter = NULL; |
cfb180f3 | 882 | |
8b372562 TZ |
883 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
884 | if (!system->filter) { | |
885 | pr_warning("Could not allocate filter for subsystem " | |
886 | "'%s'\n", name); | |
887 | return system->entry; | |
888 | } | |
889 | ||
e1112b4d TZ |
890 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
891 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
892 | if (!entry) { |
893 | kfree(system->filter); | |
894 | system->filter = NULL; | |
e1112b4d TZ |
895 | pr_warning("Could not create debugfs " |
896 | "'%s/filter' entry\n", name); | |
8b372562 | 897 | } |
e1112b4d | 898 | |
8ae79a13 SR |
899 | entry = trace_create_file("enable", 0644, system->entry, |
900 | (void *)system->name, | |
901 | &ftrace_system_enable_fops); | |
902 | ||
6ecc2d1c SR |
903 | return system->entry; |
904 | } | |
905 | ||
1473e441 | 906 | static int |
701970b3 SR |
907 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
908 | const struct file_operations *id, | |
909 | const struct file_operations *enable, | |
910 | const struct file_operations *filter, | |
911 | const struct file_operations *format) | |
1473e441 SR |
912 | { |
913 | struct dentry *entry; | |
fd994989 | 914 | int ret; |
1473e441 | 915 | |
6ecc2d1c SR |
916 | /* |
917 | * If the trace point header did not define TRACE_SYSTEM | |
918 | * then the system would be called "TRACE_SYSTEM". | |
919 | */ | |
6d723736 | 920 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
6ecc2d1c SR |
921 | d_events = event_subsystem_dir(call->system, d_events); |
922 | ||
fd994989 SR |
923 | if (call->raw_init) { |
924 | ret = call->raw_init(); | |
925 | if (ret < 0) { | |
926 | pr_warning("Could not initialize trace point" | |
927 | " events/%s\n", call->name); | |
928 | return ret; | |
929 | } | |
930 | } | |
931 | ||
1473e441 SR |
932 | call->dir = debugfs_create_dir(call->name, d_events); |
933 | if (!call->dir) { | |
934 | pr_warning("Could not create debugfs " | |
935 | "'%s' directory\n", call->name); | |
936 | return -1; | |
937 | } | |
938 | ||
6d723736 SR |
939 | if (call->regfunc) |
940 | entry = trace_create_file("enable", 0644, call->dir, call, | |
701970b3 | 941 | enable); |
1473e441 | 942 | |
6d723736 SR |
943 | if (call->id) |
944 | entry = trace_create_file("id", 0444, call->dir, call, | |
701970b3 | 945 | id); |
23725aee | 946 | |
cf027f64 TZ |
947 | if (call->define_fields) { |
948 | ret = call->define_fields(); | |
949 | if (ret < 0) { | |
950 | pr_warning("Could not initialize trace point" | |
951 | " events/%s\n", call->name); | |
952 | return ret; | |
953 | } | |
6d723736 | 954 | entry = trace_create_file("filter", 0644, call->dir, call, |
701970b3 | 955 | filter); |
cf027f64 TZ |
956 | } |
957 | ||
981d081e SR |
958 | /* A trace may not want to export its format */ |
959 | if (!call->show_format) | |
960 | return 0; | |
961 | ||
6d723736 | 962 | entry = trace_create_file("format", 0444, call->dir, call, |
701970b3 | 963 | format); |
6d723736 SR |
964 | |
965 | return 0; | |
966 | } | |
967 | ||
968 | #define for_each_event(event, start, end) \ | |
969 | for (event = start; \ | |
970 | (unsigned long)event < (unsigned long)end; \ | |
971 | event++) | |
972 | ||
61f919a1 | 973 | #ifdef CONFIG_MODULES |
701970b3 SR |
974 | |
975 | static LIST_HEAD(ftrace_module_file_list); | |
976 | ||
977 | /* | |
978 | * Modules must own their file_operations to keep up with | |
979 | * reference counting. | |
980 | */ | |
981 | struct ftrace_module_file_ops { | |
982 | struct list_head list; | |
983 | struct module *mod; | |
984 | struct file_operations id; | |
985 | struct file_operations enable; | |
986 | struct file_operations format; | |
987 | struct file_operations filter; | |
988 | }; | |
989 | ||
990 | static struct ftrace_module_file_ops * | |
991 | trace_create_file_ops(struct module *mod) | |
992 | { | |
993 | struct ftrace_module_file_ops *file_ops; | |
994 | ||
995 | /* | |
996 | * This is a bit of a PITA. To allow for correct reference | |
997 | * counting, modules must "own" their file_operations. | |
998 | * To do this, we allocate the file operations that will be | |
999 | * used in the event directory. | |
1000 | */ | |
1001 | ||
1002 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1003 | if (!file_ops) | |
1004 | return NULL; | |
1005 | ||
1006 | file_ops->mod = mod; | |
1007 | ||
1008 | file_ops->id = ftrace_event_id_fops; | |
1009 | file_ops->id.owner = mod; | |
1010 | ||
1011 | file_ops->enable = ftrace_enable_fops; | |
1012 | file_ops->enable.owner = mod; | |
1013 | ||
1014 | file_ops->filter = ftrace_event_filter_fops; | |
1015 | file_ops->filter.owner = mod; | |
1016 | ||
1017 | file_ops->format = ftrace_event_format_fops; | |
1018 | file_ops->format.owner = mod; | |
1019 | ||
1020 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1021 | ||
1022 | return file_ops; | |
1023 | } | |
1024 | ||
6d723736 SR |
1025 | static void trace_module_add_events(struct module *mod) |
1026 | { | |
701970b3 | 1027 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
1028 | struct ftrace_event_call *call, *start, *end; |
1029 | struct dentry *d_events; | |
1030 | ||
1031 | start = mod->trace_events; | |
1032 | end = mod->trace_events + mod->num_trace_events; | |
1033 | ||
1034 | if (start == end) | |
1035 | return; | |
1036 | ||
1037 | d_events = event_trace_events_dir(); | |
1038 | if (!d_events) | |
1039 | return; | |
1040 | ||
1041 | for_each_event(call, start, end) { | |
1042 | /* The linker may leave blanks */ | |
1043 | if (!call->name) | |
1044 | continue; | |
701970b3 SR |
1045 | |
1046 | /* | |
1047 | * This module has events, create file ops for this module | |
1048 | * if not already done. | |
1049 | */ | |
1050 | if (!file_ops) { | |
1051 | file_ops = trace_create_file_ops(mod); | |
1052 | if (!file_ops) | |
1053 | return; | |
1054 | } | |
6d723736 SR |
1055 | call->mod = mod; |
1056 | list_add(&call->list, &ftrace_events); | |
701970b3 SR |
1057 | event_create_dir(call, d_events, |
1058 | &file_ops->id, &file_ops->enable, | |
1059 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1060 | } |
1061 | } | |
1062 | ||
1063 | static void trace_module_remove_events(struct module *mod) | |
1064 | { | |
701970b3 | 1065 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1066 | struct ftrace_event_call *call, *p; |
9456f0fa | 1067 | bool found = false; |
6d723736 | 1068 | |
110bf2b7 | 1069 | down_write(&trace_event_mutex); |
6d723736 SR |
1070 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1071 | if (call->mod == mod) { | |
9456f0fa | 1072 | found = true; |
0e907c99 | 1073 | ftrace_event_enable_disable(call, 0); |
6d723736 | 1074 | if (call->event) |
110bf2b7 | 1075 | __unregister_ftrace_event(call->event); |
6d723736 SR |
1076 | debugfs_remove_recursive(call->dir); |
1077 | list_del(&call->list); | |
2df75e41 LZ |
1078 | trace_destroy_fields(call); |
1079 | destroy_preds(call); | |
6d723736 SR |
1080 | } |
1081 | } | |
701970b3 SR |
1082 | |
1083 | /* Now free the file_operations */ | |
1084 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1085 | if (file_ops->mod == mod) | |
1086 | break; | |
1087 | } | |
1088 | if (&file_ops->list != &ftrace_module_file_list) { | |
1089 | list_del(&file_ops->list); | |
1090 | kfree(file_ops); | |
1091 | } | |
9456f0fa SR |
1092 | |
1093 | /* | |
1094 | * It is safest to reset the ring buffer if the module being unloaded | |
1095 | * registered any events. | |
1096 | */ | |
1097 | if (found) | |
1098 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1099 | up_write(&trace_event_mutex); |
6d723736 SR |
1100 | } |
1101 | ||
61f919a1 SR |
1102 | static int trace_module_notify(struct notifier_block *self, |
1103 | unsigned long val, void *data) | |
6d723736 SR |
1104 | { |
1105 | struct module *mod = data; | |
1106 | ||
1107 | mutex_lock(&event_mutex); | |
1108 | switch (val) { | |
1109 | case MODULE_STATE_COMING: | |
1110 | trace_module_add_events(mod); | |
1111 | break; | |
1112 | case MODULE_STATE_GOING: | |
1113 | trace_module_remove_events(mod); | |
1114 | break; | |
1115 | } | |
1116 | mutex_unlock(&event_mutex); | |
fd994989 | 1117 | |
1473e441 SR |
1118 | return 0; |
1119 | } | |
61f919a1 SR |
1120 | #else |
1121 | static int trace_module_notify(struct notifier_block *self, | |
1122 | unsigned long val, void *data) | |
1123 | { | |
1124 | return 0; | |
1125 | } | |
1126 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1127 | |
6d723736 SR |
1128 | struct notifier_block trace_module_nb = { |
1129 | .notifier_call = trace_module_notify, | |
1130 | .priority = 0, | |
1131 | }; | |
1132 | ||
a59fd602 SR |
1133 | extern struct ftrace_event_call __start_ftrace_events[]; |
1134 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
1135 | ||
b77e38aa SR |
1136 | static __init int event_trace_init(void) |
1137 | { | |
a59fd602 | 1138 | struct ftrace_event_call *call; |
b77e38aa SR |
1139 | struct dentry *d_tracer; |
1140 | struct dentry *entry; | |
1473e441 | 1141 | struct dentry *d_events; |
6d723736 | 1142 | int ret; |
b77e38aa SR |
1143 | |
1144 | d_tracer = tracing_init_dentry(); | |
1145 | if (!d_tracer) | |
1146 | return 0; | |
1147 | ||
2314c4ae SR |
1148 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1149 | (void *)&show_event_seq_ops, | |
1150 | &ftrace_avail_fops); | |
1151 | if (!entry) | |
1152 | pr_warning("Could not create debugfs " | |
1153 | "'available_events' entry\n"); | |
1154 | ||
b77e38aa SR |
1155 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1156 | (void *)&show_set_event_seq_ops, | |
1157 | &ftrace_set_event_fops); | |
1158 | if (!entry) | |
1159 | pr_warning("Could not create debugfs " | |
1160 | "'set_event' entry\n"); | |
1161 | ||
1473e441 SR |
1162 | d_events = event_trace_events_dir(); |
1163 | if (!d_events) | |
1164 | return 0; | |
1165 | ||
d1b182a8 SR |
1166 | /* ring buffer internal formats */ |
1167 | trace_create_file("header_page", 0444, d_events, | |
1168 | ring_buffer_print_page_header, | |
1169 | &ftrace_show_header_fops); | |
1170 | ||
1171 | trace_create_file("header_event", 0444, d_events, | |
1172 | ring_buffer_print_entry_header, | |
1173 | &ftrace_show_header_fops); | |
1174 | ||
8ae79a13 | 1175 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1176 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1177 | |
6d723736 | 1178 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1179 | /* The linker may leave blanks */ |
1180 | if (!call->name) | |
1181 | continue; | |
a59fd602 | 1182 | list_add(&call->list, &ftrace_events); |
701970b3 SR |
1183 | event_create_dir(call, d_events, &ftrace_event_id_fops, |
1184 | &ftrace_enable_fops, &ftrace_event_filter_fops, | |
1185 | &ftrace_event_format_fops); | |
1473e441 SR |
1186 | } |
1187 | ||
6d723736 | 1188 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1189 | if (ret) |
6d723736 SR |
1190 | pr_warning("Failed to register trace events module notifier\n"); |
1191 | ||
b77e38aa SR |
1192 | return 0; |
1193 | } | |
1194 | fs_initcall(event_trace_init); | |
e6187007 SR |
1195 | |
1196 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1197 | ||
1198 | static DEFINE_SPINLOCK(test_spinlock); | |
1199 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1200 | static DEFINE_MUTEX(test_mutex); | |
1201 | ||
1202 | static __init void test_work(struct work_struct *dummy) | |
1203 | { | |
1204 | spin_lock(&test_spinlock); | |
1205 | spin_lock_irq(&test_spinlock_irq); | |
1206 | udelay(1); | |
1207 | spin_unlock_irq(&test_spinlock_irq); | |
1208 | spin_unlock(&test_spinlock); | |
1209 | ||
1210 | mutex_lock(&test_mutex); | |
1211 | msleep(1); | |
1212 | mutex_unlock(&test_mutex); | |
1213 | } | |
1214 | ||
1215 | static __init int event_test_thread(void *unused) | |
1216 | { | |
1217 | void *test_malloc; | |
1218 | ||
1219 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1220 | if (!test_malloc) | |
1221 | pr_info("failed to kmalloc\n"); | |
1222 | ||
1223 | schedule_on_each_cpu(test_work); | |
1224 | ||
1225 | kfree(test_malloc); | |
1226 | ||
1227 | set_current_state(TASK_INTERRUPTIBLE); | |
1228 | while (!kthread_should_stop()) | |
1229 | schedule(); | |
1230 | ||
1231 | return 0; | |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * Do various things that may trigger events. | |
1236 | */ | |
1237 | static __init void event_test_stuff(void) | |
1238 | { | |
1239 | struct task_struct *test_thread; | |
1240 | ||
1241 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1242 | msleep(1); | |
1243 | kthread_stop(test_thread); | |
1244 | } | |
1245 | ||
1246 | /* | |
1247 | * For every trace event defined, we will test each trace point separately, | |
1248 | * and then by groups, and finally all trace points. | |
1249 | */ | |
9ea21c1e | 1250 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1251 | { |
1252 | struct ftrace_event_call *call; | |
1253 | struct event_subsystem *system; | |
e6187007 SR |
1254 | int ret; |
1255 | ||
1256 | pr_info("Running tests on trace events:\n"); | |
1257 | ||
1258 | list_for_each_entry(call, &ftrace_events, list) { | |
1259 | ||
1260 | /* Only test those that have a regfunc */ | |
1261 | if (!call->regfunc) | |
1262 | continue; | |
1263 | ||
1264 | pr_info("Testing event %s: ", call->name); | |
1265 | ||
1266 | /* | |
1267 | * If an event is already enabled, someone is using | |
1268 | * it and the self test should not be on. | |
1269 | */ | |
1270 | if (call->enabled) { | |
1271 | pr_warning("Enabled event during self test!\n"); | |
1272 | WARN_ON_ONCE(1); | |
1273 | continue; | |
1274 | } | |
1275 | ||
0e907c99 | 1276 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1277 | event_test_stuff(); |
0e907c99 | 1278 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1279 | |
1280 | pr_cont("OK\n"); | |
1281 | } | |
1282 | ||
1283 | /* Now test at the sub system level */ | |
1284 | ||
1285 | pr_info("Running tests on trace event systems:\n"); | |
1286 | ||
1287 | list_for_each_entry(system, &event_subsystems, list) { | |
1288 | ||
1289 | /* the ftrace system is special, skip it */ | |
1290 | if (strcmp(system->name, "ftrace") == 0) | |
1291 | continue; | |
1292 | ||
1293 | pr_info("Testing event system %s: ", system->name); | |
1294 | ||
8f31bfe5 | 1295 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1296 | if (WARN_ON_ONCE(ret)) { |
1297 | pr_warning("error enabling system %s\n", | |
1298 | system->name); | |
1299 | continue; | |
1300 | } | |
1301 | ||
1302 | event_test_stuff(); | |
1303 | ||
8f31bfe5 | 1304 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1305 | if (WARN_ON_ONCE(ret)) |
1306 | pr_warning("error disabling system %s\n", | |
1307 | system->name); | |
1308 | ||
1309 | pr_cont("OK\n"); | |
1310 | } | |
1311 | ||
1312 | /* Test with all events enabled */ | |
1313 | ||
1314 | pr_info("Running tests on all trace events:\n"); | |
1315 | pr_info("Testing all events: "); | |
1316 | ||
8f31bfe5 | 1317 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1318 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1319 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1320 | return; |
e6187007 SR |
1321 | } |
1322 | ||
1323 | event_test_stuff(); | |
1324 | ||
1325 | /* reset sysname */ | |
8f31bfe5 | 1326 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1327 | if (WARN_ON_ONCE(ret)) { |
1328 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1329 | return; |
e6187007 SR |
1330 | } |
1331 | ||
1332 | pr_cont("OK\n"); | |
9ea21c1e SR |
1333 | } |
1334 | ||
1335 | #ifdef CONFIG_FUNCTION_TRACER | |
1336 | ||
1337 | static DEFINE_PER_CPU(atomic_t, test_event_disable); | |
1338 | ||
1339 | static void | |
1340 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1341 | { | |
1342 | struct ring_buffer_event *event; | |
1343 | struct ftrace_entry *entry; | |
1344 | unsigned long flags; | |
1345 | long disabled; | |
1346 | int resched; | |
1347 | int cpu; | |
1348 | int pc; | |
1349 | ||
1350 | pc = preempt_count(); | |
1351 | resched = ftrace_preempt_disable(); | |
1352 | cpu = raw_smp_processor_id(); | |
1353 | disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu)); | |
1354 | ||
1355 | if (disabled != 1) | |
1356 | goto out; | |
1357 | ||
1358 | local_save_flags(flags); | |
1359 | ||
1360 | event = trace_current_buffer_lock_reserve(TRACE_FN, sizeof(*entry), | |
1361 | flags, pc); | |
1362 | if (!event) | |
1363 | goto out; | |
1364 | entry = ring_buffer_event_data(event); | |
1365 | entry->ip = ip; | |
1366 | entry->parent_ip = parent_ip; | |
1367 | ||
cb4764a6 | 1368 | trace_nowake_buffer_unlock_commit(event, flags, pc); |
9ea21c1e SR |
1369 | |
1370 | out: | |
1371 | atomic_dec(&per_cpu(test_event_disable, cpu)); | |
1372 | ftrace_preempt_enable(resched); | |
1373 | } | |
1374 | ||
1375 | static struct ftrace_ops trace_ops __initdata = | |
1376 | { | |
1377 | .func = function_test_events_call, | |
1378 | }; | |
1379 | ||
1380 | static __init void event_trace_self_test_with_function(void) | |
1381 | { | |
1382 | register_ftrace_function(&trace_ops); | |
1383 | pr_info("Running tests again, along with the function tracer\n"); | |
1384 | event_trace_self_tests(); | |
1385 | unregister_ftrace_function(&trace_ops); | |
1386 | } | |
1387 | #else | |
1388 | static __init void event_trace_self_test_with_function(void) | |
1389 | { | |
1390 | } | |
1391 | #endif | |
1392 | ||
1393 | static __init int event_trace_self_tests_init(void) | |
1394 | { | |
1395 | ||
1396 | event_trace_self_tests(); | |
1397 | ||
1398 | event_trace_self_test_with_function(); | |
e6187007 SR |
1399 | |
1400 | return 0; | |
1401 | } | |
1402 | ||
28d20e2d | 1403 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1404 | |
1405 | #endif |