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 | |
020e5f85 LZ |
20 | #include <asm/setup.h> |
21 | ||
91729ef9 | 22 | #include "trace_output.h" |
b77e38aa | 23 | |
b628b3e6 SR |
24 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
25 | ||
20c8928a | 26 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 27 | |
a59fd602 SR |
28 | LIST_HEAD(ftrace_events); |
29 | ||
bd1a5c84 MH |
30 | int trace_define_field(struct ftrace_event_call *call, char *type, |
31 | char *name, int offset, int size, int is_signed, | |
43b51ead | 32 | int filter_type) |
cf027f64 TZ |
33 | { |
34 | struct ftrace_event_field *field; | |
35 | ||
fe9f57f2 | 36 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
37 | if (!field) |
38 | goto err; | |
fe9f57f2 | 39 | |
cf027f64 TZ |
40 | field->name = kstrdup(name, GFP_KERNEL); |
41 | if (!field->name) | |
42 | goto err; | |
fe9f57f2 | 43 | |
cf027f64 TZ |
44 | field->type = kstrdup(type, GFP_KERNEL); |
45 | if (!field->type) | |
46 | goto err; | |
fe9f57f2 | 47 | |
43b51ead LZ |
48 | if (filter_type == FILTER_OTHER) |
49 | field->filter_type = filter_assign_type(type); | |
50 | else | |
51 | field->filter_type = filter_type; | |
52 | ||
cf027f64 TZ |
53 | field->offset = offset; |
54 | field->size = size; | |
a118e4d1 | 55 | field->is_signed = is_signed; |
aa38e9fc | 56 | |
cf027f64 TZ |
57 | list_add(&field->link, &call->fields); |
58 | ||
59 | return 0; | |
fe9f57f2 | 60 | |
cf027f64 TZ |
61 | err: |
62 | if (field) { | |
63 | kfree(field->name); | |
64 | kfree(field->type); | |
65 | } | |
66 | kfree(field); | |
fe9f57f2 | 67 | |
cf027f64 TZ |
68 | return -ENOMEM; |
69 | } | |
17c873ec | 70 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 71 | |
e647d6b3 LZ |
72 | #define __common_field(type, item) \ |
73 | ret = trace_define_field(call, #type, "common_" #item, \ | |
74 | offsetof(typeof(ent), item), \ | |
75 | sizeof(ent.item), \ | |
43b51ead | 76 | is_signed_type(type), FILTER_OTHER); \ |
e647d6b3 LZ |
77 | if (ret) \ |
78 | return ret; | |
79 | ||
80 | int trace_define_common_fields(struct ftrace_event_call *call) | |
81 | { | |
82 | int ret; | |
83 | struct trace_entry ent; | |
84 | ||
85 | __common_field(unsigned short, type); | |
86 | __common_field(unsigned char, flags); | |
87 | __common_field(unsigned char, preempt_count); | |
88 | __common_field(int, pid); | |
89 | __common_field(int, tgid); | |
90 | ||
91 | return ret; | |
92 | } | |
540b7b8d | 93 | EXPORT_SYMBOL_GPL(trace_define_common_fields); |
e647d6b3 | 94 | |
bd1a5c84 | 95 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
96 | { |
97 | struct ftrace_event_field *field, *next; | |
98 | ||
99 | list_for_each_entry_safe(field, next, &call->fields, link) { | |
100 | list_del(&field->link); | |
101 | kfree(field->type); | |
102 | kfree(field->name); | |
103 | kfree(field); | |
104 | } | |
105 | } | |
106 | ||
fd994989 SR |
107 | static void ftrace_event_enable_disable(struct ftrace_event_call *call, |
108 | int enable) | |
109 | { | |
fd994989 SR |
110 | switch (enable) { |
111 | case 0: | |
112 | if (call->enabled) { | |
113 | call->enabled = 0; | |
b11c53e1 | 114 | tracing_stop_cmdline_record(); |
bd1a5c84 | 115 | call->unregfunc(call); |
fd994989 | 116 | } |
fd994989 SR |
117 | break; |
118 | case 1: | |
da4d0302 | 119 | if (!call->enabled) { |
fd994989 | 120 | call->enabled = 1; |
b11c53e1 | 121 | tracing_start_cmdline_record(); |
bd1a5c84 | 122 | call->regfunc(call); |
fd994989 | 123 | } |
fd994989 SR |
124 | break; |
125 | } | |
126 | } | |
127 | ||
0e907c99 Z |
128 | static void ftrace_clear_events(void) |
129 | { | |
130 | struct ftrace_event_call *call; | |
131 | ||
132 | mutex_lock(&event_mutex); | |
133 | list_for_each_entry(call, &ftrace_events, list) { | |
134 | ftrace_event_enable_disable(call, 0); | |
135 | } | |
136 | mutex_unlock(&event_mutex); | |
137 | } | |
138 | ||
8f31bfe5 LZ |
139 | /* |
140 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
141 | */ | |
142 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
143 | const char *event, int set) | |
b77e38aa | 144 | { |
a59fd602 | 145 | struct ftrace_event_call *call; |
29f93943 | 146 | int ret = -EINVAL; |
8f31bfe5 LZ |
147 | |
148 | mutex_lock(&event_mutex); | |
149 | list_for_each_entry(call, &ftrace_events, list) { | |
150 | ||
151 | if (!call->name || !call->regfunc) | |
152 | continue; | |
153 | ||
154 | if (match && | |
155 | strcmp(match, call->name) != 0 && | |
156 | strcmp(match, call->system) != 0) | |
157 | continue; | |
158 | ||
159 | if (sub && strcmp(sub, call->system) != 0) | |
160 | continue; | |
161 | ||
162 | if (event && strcmp(event, call->name) != 0) | |
163 | continue; | |
164 | ||
165 | ftrace_event_enable_disable(call, set); | |
166 | ||
167 | ret = 0; | |
168 | } | |
169 | mutex_unlock(&event_mutex); | |
170 | ||
171 | return ret; | |
172 | } | |
173 | ||
174 | static int ftrace_set_clr_event(char *buf, int set) | |
175 | { | |
b628b3e6 | 176 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
177 | |
178 | /* | |
179 | * The buf format can be <subsystem>:<event-name> | |
180 | * *:<event-name> means any event by that name. | |
181 | * :<event-name> is the same. | |
182 | * | |
183 | * <subsystem>:* means all events in that subsystem | |
184 | * <subsystem>: means the same. | |
185 | * | |
186 | * <name> (no ':') means all events in a subsystem with | |
187 | * the name <name> or any event that matches <name> | |
188 | */ | |
189 | ||
190 | match = strsep(&buf, ":"); | |
191 | if (buf) { | |
192 | sub = match; | |
193 | event = buf; | |
194 | match = NULL; | |
195 | ||
196 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
197 | sub = NULL; | |
198 | if (!strlen(event) || strcmp(event, "*") == 0) | |
199 | event = NULL; | |
200 | } | |
b77e38aa | 201 | |
8f31bfe5 | 202 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
203 | } |
204 | ||
4671c794 SR |
205 | /** |
206 | * trace_set_clr_event - enable or disable an event | |
207 | * @system: system name to match (NULL for any system) | |
208 | * @event: event name to match (NULL for all events, within system) | |
209 | * @set: 1 to enable, 0 to disable | |
210 | * | |
211 | * This is a way for other parts of the kernel to enable or disable | |
212 | * event recording. | |
213 | * | |
214 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
215 | * registered events. | |
216 | */ | |
217 | int trace_set_clr_event(const char *system, const char *event, int set) | |
218 | { | |
219 | return __ftrace_set_clr_event(NULL, system, event, set); | |
220 | } | |
221 | ||
b77e38aa SR |
222 | /* 128 should be much more than enough */ |
223 | #define EVENT_BUF_SIZE 127 | |
224 | ||
225 | static ssize_t | |
226 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
227 | size_t cnt, loff_t *ppos) | |
228 | { | |
229 | size_t read = 0; | |
230 | int i, set = 1; | |
231 | ssize_t ret; | |
232 | char *buf; | |
233 | char ch; | |
234 | ||
235 | if (!cnt || cnt < 0) | |
236 | return 0; | |
237 | ||
1852fcce SR |
238 | ret = tracing_update_buffers(); |
239 | if (ret < 0) | |
240 | return ret; | |
241 | ||
b77e38aa SR |
242 | ret = get_user(ch, ubuf++); |
243 | if (ret) | |
244 | return ret; | |
245 | read++; | |
246 | cnt--; | |
247 | ||
248 | /* skip white space */ | |
249 | while (cnt && isspace(ch)) { | |
250 | ret = get_user(ch, ubuf++); | |
251 | if (ret) | |
252 | return ret; | |
253 | read++; | |
254 | cnt--; | |
255 | } | |
256 | ||
257 | /* Only white space found? */ | |
258 | if (isspace(ch)) { | |
259 | file->f_pos += read; | |
260 | ret = read; | |
261 | return ret; | |
262 | } | |
263 | ||
264 | buf = kmalloc(EVENT_BUF_SIZE+1, GFP_KERNEL); | |
265 | if (!buf) | |
266 | return -ENOMEM; | |
267 | ||
268 | if (cnt > EVENT_BUF_SIZE) | |
269 | cnt = EVENT_BUF_SIZE; | |
270 | ||
271 | i = 0; | |
272 | while (cnt && !isspace(ch)) { | |
273 | if (!i && ch == '!') | |
274 | set = 0; | |
275 | else | |
276 | buf[i++] = ch; | |
277 | ||
278 | ret = get_user(ch, ubuf++); | |
279 | if (ret) | |
280 | goto out_free; | |
281 | read++; | |
282 | cnt--; | |
283 | } | |
284 | buf[i] = 0; | |
285 | ||
286 | file->f_pos += read; | |
287 | ||
288 | ret = ftrace_set_clr_event(buf, set); | |
289 | if (ret) | |
290 | goto out_free; | |
291 | ||
292 | ret = read; | |
293 | ||
294 | out_free: | |
295 | kfree(buf); | |
296 | ||
297 | return ret; | |
298 | } | |
299 | ||
300 | static void * | |
301 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
302 | { | |
a59fd602 SR |
303 | struct list_head *list = m->private; |
304 | struct ftrace_event_call *call; | |
b77e38aa SR |
305 | |
306 | (*pos)++; | |
307 | ||
40e26815 | 308 | for (;;) { |
a59fd602 | 309 | if (list == &ftrace_events) |
40e26815 SR |
310 | return NULL; |
311 | ||
a59fd602 SR |
312 | call = list_entry(list, struct ftrace_event_call, list); |
313 | ||
40e26815 SR |
314 | /* |
315 | * The ftrace subsystem is for showing formats only. | |
316 | * They can not be enabled or disabled via the event files. | |
317 | */ | |
318 | if (call->regfunc) | |
319 | break; | |
320 | ||
a59fd602 | 321 | list = list->next; |
40e26815 | 322 | } |
b77e38aa | 323 | |
a59fd602 | 324 | m->private = list->next; |
b77e38aa SR |
325 | |
326 | return call; | |
327 | } | |
328 | ||
329 | static void *t_start(struct seq_file *m, loff_t *pos) | |
330 | { | |
e1c7e2a6 LZ |
331 | struct ftrace_event_call *call = NULL; |
332 | loff_t l; | |
333 | ||
20c8928a | 334 | mutex_lock(&event_mutex); |
e1c7e2a6 LZ |
335 | |
336 | m->private = ftrace_events.next; | |
337 | for (l = 0; l <= *pos; ) { | |
338 | call = t_next(m, NULL, &l); | |
339 | if (!call) | |
340 | break; | |
341 | } | |
342 | return call; | |
b77e38aa SR |
343 | } |
344 | ||
345 | static void * | |
346 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
347 | { | |
a59fd602 SR |
348 | struct list_head *list = m->private; |
349 | struct ftrace_event_call *call; | |
b77e38aa SR |
350 | |
351 | (*pos)++; | |
352 | ||
353 | retry: | |
a59fd602 | 354 | if (list == &ftrace_events) |
b77e38aa SR |
355 | return NULL; |
356 | ||
a59fd602 SR |
357 | call = list_entry(list, struct ftrace_event_call, list); |
358 | ||
b77e38aa | 359 | if (!call->enabled) { |
a59fd602 | 360 | list = list->next; |
b77e38aa SR |
361 | goto retry; |
362 | } | |
363 | ||
a59fd602 | 364 | m->private = list->next; |
b77e38aa SR |
365 | |
366 | return call; | |
367 | } | |
368 | ||
369 | static void *s_start(struct seq_file *m, loff_t *pos) | |
370 | { | |
e1c7e2a6 LZ |
371 | struct ftrace_event_call *call = NULL; |
372 | loff_t l; | |
373 | ||
20c8928a | 374 | mutex_lock(&event_mutex); |
e1c7e2a6 LZ |
375 | |
376 | m->private = ftrace_events.next; | |
377 | for (l = 0; l <= *pos; ) { | |
378 | call = s_next(m, NULL, &l); | |
379 | if (!call) | |
380 | break; | |
381 | } | |
382 | return call; | |
b77e38aa SR |
383 | } |
384 | ||
385 | static int t_show(struct seq_file *m, void *v) | |
386 | { | |
387 | struct ftrace_event_call *call = v; | |
388 | ||
b628b3e6 SR |
389 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
390 | seq_printf(m, "%s:", call->system); | |
b77e38aa SR |
391 | seq_printf(m, "%s\n", call->name); |
392 | ||
393 | return 0; | |
394 | } | |
395 | ||
396 | static void t_stop(struct seq_file *m, void *p) | |
397 | { | |
20c8928a | 398 | mutex_unlock(&event_mutex); |
b77e38aa SR |
399 | } |
400 | ||
401 | static int | |
402 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
403 | { | |
b77e38aa SR |
404 | const struct seq_operations *seq_ops; |
405 | ||
406 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 407 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
408 | ftrace_clear_events(); |
409 | ||
410 | seq_ops = inode->i_private; | |
20c8928a | 411 | return seq_open(file, seq_ops); |
b77e38aa SR |
412 | } |
413 | ||
1473e441 SR |
414 | static ssize_t |
415 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
416 | loff_t *ppos) | |
417 | { | |
418 | struct ftrace_event_call *call = filp->private_data; | |
419 | char *buf; | |
420 | ||
da4d0302 | 421 | if (call->enabled) |
1473e441 SR |
422 | buf = "1\n"; |
423 | else | |
424 | buf = "0\n"; | |
425 | ||
426 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
427 | } | |
428 | ||
429 | static ssize_t | |
430 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
431 | loff_t *ppos) | |
432 | { | |
433 | struct ftrace_event_call *call = filp->private_data; | |
434 | char buf[64]; | |
435 | unsigned long val; | |
436 | int ret; | |
437 | ||
438 | if (cnt >= sizeof(buf)) | |
439 | return -EINVAL; | |
440 | ||
441 | if (copy_from_user(&buf, ubuf, cnt)) | |
442 | return -EFAULT; | |
443 | ||
444 | buf[cnt] = 0; | |
445 | ||
446 | ret = strict_strtoul(buf, 10, &val); | |
447 | if (ret < 0) | |
448 | return ret; | |
449 | ||
1852fcce SR |
450 | ret = tracing_update_buffers(); |
451 | if (ret < 0) | |
452 | return ret; | |
453 | ||
1473e441 SR |
454 | switch (val) { |
455 | case 0: | |
1473e441 | 456 | case 1: |
11a241a3 | 457 | mutex_lock(&event_mutex); |
fd994989 | 458 | ftrace_event_enable_disable(call, val); |
11a241a3 | 459 | mutex_unlock(&event_mutex); |
1473e441 SR |
460 | break; |
461 | ||
462 | default: | |
463 | return -EINVAL; | |
464 | } | |
465 | ||
466 | *ppos += cnt; | |
467 | ||
468 | return cnt; | |
469 | } | |
470 | ||
8ae79a13 SR |
471 | static ssize_t |
472 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
473 | loff_t *ppos) | |
474 | { | |
c142b15d | 475 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
476 | const char *system = filp->private_data; |
477 | struct ftrace_event_call *call; | |
478 | char buf[2]; | |
c142b15d | 479 | int set = 0; |
8ae79a13 SR |
480 | int ret; |
481 | ||
8ae79a13 SR |
482 | mutex_lock(&event_mutex); |
483 | list_for_each_entry(call, &ftrace_events, list) { | |
484 | if (!call->name || !call->regfunc) | |
485 | continue; | |
486 | ||
8f31bfe5 | 487 | if (system && strcmp(call->system, system) != 0) |
8ae79a13 SR |
488 | continue; |
489 | ||
490 | /* | |
491 | * We need to find out if all the events are set | |
492 | * or if all events or cleared, or if we have | |
493 | * a mixture. | |
494 | */ | |
c142b15d LZ |
495 | set |= (1 << !!call->enabled); |
496 | ||
8ae79a13 SR |
497 | /* |
498 | * If we have a mixture, no need to look further. | |
499 | */ | |
c142b15d | 500 | if (set == 3) |
8ae79a13 SR |
501 | break; |
502 | } | |
503 | mutex_unlock(&event_mutex); | |
504 | ||
c142b15d | 505 | buf[0] = set_to_char[set]; |
8ae79a13 | 506 | buf[1] = '\n'; |
8ae79a13 SR |
507 | |
508 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
509 | ||
510 | return ret; | |
511 | } | |
512 | ||
513 | static ssize_t | |
514 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
515 | loff_t *ppos) | |
516 | { | |
517 | const char *system = filp->private_data; | |
518 | unsigned long val; | |
8ae79a13 SR |
519 | char buf[64]; |
520 | ssize_t ret; | |
521 | ||
522 | if (cnt >= sizeof(buf)) | |
523 | return -EINVAL; | |
524 | ||
525 | if (copy_from_user(&buf, ubuf, cnt)) | |
526 | return -EFAULT; | |
527 | ||
528 | buf[cnt] = 0; | |
529 | ||
530 | ret = strict_strtoul(buf, 10, &val); | |
531 | if (ret < 0) | |
532 | return ret; | |
533 | ||
534 | ret = tracing_update_buffers(); | |
535 | if (ret < 0) | |
536 | return ret; | |
537 | ||
8f31bfe5 | 538 | if (val != 0 && val != 1) |
8ae79a13 | 539 | return -EINVAL; |
8ae79a13 | 540 | |
8f31bfe5 | 541 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 542 | if (ret) |
8f31bfe5 | 543 | goto out; |
8ae79a13 SR |
544 | |
545 | ret = cnt; | |
546 | ||
8f31bfe5 | 547 | out: |
8ae79a13 SR |
548 | *ppos += cnt; |
549 | ||
550 | return ret; | |
551 | } | |
552 | ||
75db37d2 SR |
553 | extern char *__bad_type_size(void); |
554 | ||
91729ef9 | 555 | #undef FIELD |
156b5f17 | 556 | #define FIELD(type, name) \ |
75db37d2 | 557 | sizeof(type) != sizeof(field.name) ? __bad_type_size() : \ |
cf027f64 TZ |
558 | #type, "common_" #name, offsetof(typeof(field), name), \ |
559 | sizeof(field.name) | |
91729ef9 SR |
560 | |
561 | static int trace_write_header(struct trace_seq *s) | |
562 | { | |
563 | struct trace_entry field; | |
564 | ||
565 | /* struct trace_entry */ | |
566 | return trace_seq_printf(s, | |
ce8eb2bf SR |
567 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" |
568 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
569 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
570 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
571 | "\tfield:%s %s;\toffset:%zu;\tsize:%zu;\n" | |
91729ef9 | 572 | "\n", |
89ec0dee | 573 | FIELD(unsigned short, type), |
91729ef9 SR |
574 | FIELD(unsigned char, flags), |
575 | FIELD(unsigned char, preempt_count), | |
576 | FIELD(int, pid), | |
577 | FIELD(int, tgid)); | |
578 | } | |
da4d0302 | 579 | |
981d081e SR |
580 | static ssize_t |
581 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
582 | loff_t *ppos) | |
583 | { | |
584 | struct ftrace_event_call *call = filp->private_data; | |
585 | struct trace_seq *s; | |
586 | char *buf; | |
587 | int r; | |
588 | ||
c269fc8c TZ |
589 | if (*ppos) |
590 | return 0; | |
591 | ||
981d081e SR |
592 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
593 | if (!s) | |
594 | return -ENOMEM; | |
595 | ||
596 | trace_seq_init(s); | |
597 | ||
c5e4e192 SR |
598 | /* If any of the first writes fail, so will the show_format. */ |
599 | ||
600 | trace_seq_printf(s, "name: %s\n", call->name); | |
601 | trace_seq_printf(s, "ID: %d\n", call->id); | |
602 | trace_seq_printf(s, "format:\n"); | |
91729ef9 SR |
603 | trace_write_header(s); |
604 | ||
e8f9f4d7 | 605 | r = call->show_format(call, s); |
981d081e SR |
606 | if (!r) { |
607 | /* | |
608 | * ug! The format output is bigger than a PAGE!! | |
609 | */ | |
610 | buf = "FORMAT TOO BIG\n"; | |
611 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
612 | buf, strlen(buf)); | |
613 | goto out; | |
614 | } | |
615 | ||
616 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
617 | s->buffer, s->len); | |
618 | out: | |
619 | kfree(s); | |
620 | return r; | |
621 | } | |
622 | ||
23725aee PZ |
623 | static ssize_t |
624 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
625 | { | |
626 | struct ftrace_event_call *call = filp->private_data; | |
627 | struct trace_seq *s; | |
628 | int r; | |
629 | ||
630 | if (*ppos) | |
631 | return 0; | |
632 | ||
633 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
634 | if (!s) | |
635 | return -ENOMEM; | |
636 | ||
637 | trace_seq_init(s); | |
638 | trace_seq_printf(s, "%d\n", call->id); | |
639 | ||
640 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
641 | s->buffer, s->len); | |
642 | kfree(s); | |
643 | return r; | |
644 | } | |
645 | ||
7ce7e424 TZ |
646 | static ssize_t |
647 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
648 | loff_t *ppos) | |
649 | { | |
650 | struct ftrace_event_call *call = filp->private_data; | |
651 | struct trace_seq *s; | |
652 | int r; | |
653 | ||
654 | if (*ppos) | |
655 | return 0; | |
656 | ||
657 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
658 | if (!s) | |
659 | return -ENOMEM; | |
660 | ||
661 | trace_seq_init(s); | |
662 | ||
8b372562 | 663 | print_event_filter(call, s); |
4bda2d51 | 664 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
665 | |
666 | kfree(s); | |
667 | ||
668 | return r; | |
669 | } | |
670 | ||
671 | static ssize_t | |
672 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
673 | loff_t *ppos) | |
674 | { | |
675 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 676 | char *buf; |
7ce7e424 TZ |
677 | int err; |
678 | ||
8b372562 | 679 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
680 | return -EINVAL; |
681 | ||
8b372562 TZ |
682 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
683 | if (!buf) | |
7ce7e424 TZ |
684 | return -ENOMEM; |
685 | ||
8b372562 TZ |
686 | if (copy_from_user(buf, ubuf, cnt)) { |
687 | free_page((unsigned long) buf); | |
688 | return -EFAULT; | |
7ce7e424 | 689 | } |
8b372562 | 690 | buf[cnt] = '\0'; |
7ce7e424 | 691 | |
8b372562 TZ |
692 | err = apply_event_filter(call, buf); |
693 | free_page((unsigned long) buf); | |
694 | if (err < 0) | |
44e9c8b7 | 695 | return err; |
0a19e53c | 696 | |
7ce7e424 TZ |
697 | *ppos += cnt; |
698 | ||
699 | return cnt; | |
700 | } | |
701 | ||
cfb180f3 TZ |
702 | static ssize_t |
703 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
704 | loff_t *ppos) | |
705 | { | |
706 | struct event_subsystem *system = filp->private_data; | |
707 | struct trace_seq *s; | |
708 | int r; | |
709 | ||
710 | if (*ppos) | |
711 | return 0; | |
712 | ||
713 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
714 | if (!s) | |
715 | return -ENOMEM; | |
716 | ||
717 | trace_seq_init(s); | |
718 | ||
8b372562 | 719 | print_subsystem_event_filter(system, s); |
4bda2d51 | 720 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
721 | |
722 | kfree(s); | |
723 | ||
724 | return r; | |
725 | } | |
726 | ||
727 | static ssize_t | |
728 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
729 | loff_t *ppos) | |
730 | { | |
731 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 732 | char *buf; |
cfb180f3 TZ |
733 | int err; |
734 | ||
8b372562 | 735 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
736 | return -EINVAL; |
737 | ||
8b372562 TZ |
738 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
739 | if (!buf) | |
cfb180f3 TZ |
740 | return -ENOMEM; |
741 | ||
8b372562 TZ |
742 | if (copy_from_user(buf, ubuf, cnt)) { |
743 | free_page((unsigned long) buf); | |
744 | return -EFAULT; | |
cfb180f3 | 745 | } |
8b372562 | 746 | buf[cnt] = '\0'; |
cfb180f3 | 747 | |
8b372562 TZ |
748 | err = apply_subsystem_event_filter(system, buf); |
749 | free_page((unsigned long) buf); | |
750 | if (err < 0) | |
44e9c8b7 | 751 | return err; |
cfb180f3 TZ |
752 | |
753 | *ppos += cnt; | |
754 | ||
755 | return cnt; | |
756 | } | |
757 | ||
d1b182a8 SR |
758 | static ssize_t |
759 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
760 | { | |
761 | int (*func)(struct trace_seq *s) = filp->private_data; | |
762 | struct trace_seq *s; | |
763 | int r; | |
764 | ||
765 | if (*ppos) | |
766 | return 0; | |
767 | ||
768 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
769 | if (!s) | |
770 | return -ENOMEM; | |
771 | ||
772 | trace_seq_init(s); | |
773 | ||
774 | func(s); | |
775 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
776 | ||
777 | kfree(s); | |
778 | ||
779 | return r; | |
780 | } | |
781 | ||
b77e38aa SR |
782 | static const struct seq_operations show_event_seq_ops = { |
783 | .start = t_start, | |
784 | .next = t_next, | |
785 | .show = t_show, | |
786 | .stop = t_stop, | |
787 | }; | |
788 | ||
789 | static const struct seq_operations show_set_event_seq_ops = { | |
790 | .start = s_start, | |
791 | .next = s_next, | |
792 | .show = t_show, | |
793 | .stop = t_stop, | |
794 | }; | |
795 | ||
2314c4ae SR |
796 | static const struct file_operations ftrace_avail_fops = { |
797 | .open = ftrace_event_seq_open, | |
798 | .read = seq_read, | |
799 | .llseek = seq_lseek, | |
800 | .release = seq_release, | |
801 | }; | |
802 | ||
b77e38aa SR |
803 | static const struct file_operations ftrace_set_event_fops = { |
804 | .open = ftrace_event_seq_open, | |
805 | .read = seq_read, | |
806 | .write = ftrace_event_write, | |
807 | .llseek = seq_lseek, | |
808 | .release = seq_release, | |
809 | }; | |
810 | ||
1473e441 SR |
811 | static const struct file_operations ftrace_enable_fops = { |
812 | .open = tracing_open_generic, | |
813 | .read = event_enable_read, | |
814 | .write = event_enable_write, | |
815 | }; | |
816 | ||
981d081e SR |
817 | static const struct file_operations ftrace_event_format_fops = { |
818 | .open = tracing_open_generic, | |
819 | .read = event_format_read, | |
820 | }; | |
821 | ||
23725aee PZ |
822 | static const struct file_operations ftrace_event_id_fops = { |
823 | .open = tracing_open_generic, | |
824 | .read = event_id_read, | |
825 | }; | |
826 | ||
7ce7e424 TZ |
827 | static const struct file_operations ftrace_event_filter_fops = { |
828 | .open = tracing_open_generic, | |
829 | .read = event_filter_read, | |
830 | .write = event_filter_write, | |
831 | }; | |
832 | ||
cfb180f3 TZ |
833 | static const struct file_operations ftrace_subsystem_filter_fops = { |
834 | .open = tracing_open_generic, | |
835 | .read = subsystem_filter_read, | |
836 | .write = subsystem_filter_write, | |
837 | }; | |
838 | ||
8ae79a13 SR |
839 | static const struct file_operations ftrace_system_enable_fops = { |
840 | .open = tracing_open_generic, | |
841 | .read = system_enable_read, | |
842 | .write = system_enable_write, | |
843 | }; | |
844 | ||
d1b182a8 SR |
845 | static const struct file_operations ftrace_show_header_fops = { |
846 | .open = tracing_open_generic, | |
847 | .read = show_header, | |
848 | }; | |
849 | ||
1473e441 SR |
850 | static struct dentry *event_trace_events_dir(void) |
851 | { | |
852 | static struct dentry *d_tracer; | |
853 | static struct dentry *d_events; | |
854 | ||
855 | if (d_events) | |
856 | return d_events; | |
857 | ||
858 | d_tracer = tracing_init_dentry(); | |
859 | if (!d_tracer) | |
860 | return NULL; | |
861 | ||
862 | d_events = debugfs_create_dir("events", d_tracer); | |
863 | if (!d_events) | |
864 | pr_warning("Could not create debugfs " | |
865 | "'events' directory\n"); | |
866 | ||
867 | return d_events; | |
868 | } | |
869 | ||
6ecc2d1c SR |
870 | static LIST_HEAD(event_subsystems); |
871 | ||
872 | static struct dentry * | |
873 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
874 | { | |
875 | struct event_subsystem *system; | |
e1112b4d | 876 | struct dentry *entry; |
6ecc2d1c SR |
877 | |
878 | /* First see if we did not already create this dir */ | |
879 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
880 | if (strcmp(system->name, name) == 0) { |
881 | system->nr_events++; | |
6ecc2d1c | 882 | return system->entry; |
dc82ec98 | 883 | } |
6ecc2d1c SR |
884 | } |
885 | ||
886 | /* need to create new entry */ | |
887 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
888 | if (!system) { | |
889 | pr_warning("No memory to create event subsystem %s\n", | |
890 | name); | |
891 | return d_events; | |
892 | } | |
893 | ||
894 | system->entry = debugfs_create_dir(name, d_events); | |
895 | if (!system->entry) { | |
896 | pr_warning("Could not create event subsystem %s\n", | |
897 | name); | |
898 | kfree(system); | |
899 | return d_events; | |
900 | } | |
901 | ||
dc82ec98 | 902 | system->nr_events = 1; |
6d723736 SR |
903 | system->name = kstrdup(name, GFP_KERNEL); |
904 | if (!system->name) { | |
905 | debugfs_remove(system->entry); | |
906 | kfree(system); | |
907 | return d_events; | |
908 | } | |
909 | ||
6ecc2d1c SR |
910 | list_add(&system->list, &event_subsystems); |
911 | ||
30e673b2 | 912 | system->filter = NULL; |
cfb180f3 | 913 | |
8b372562 TZ |
914 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
915 | if (!system->filter) { | |
916 | pr_warning("Could not allocate filter for subsystem " | |
917 | "'%s'\n", name); | |
918 | return system->entry; | |
919 | } | |
920 | ||
e1112b4d TZ |
921 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
922 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
923 | if (!entry) { |
924 | kfree(system->filter); | |
925 | system->filter = NULL; | |
e1112b4d TZ |
926 | pr_warning("Could not create debugfs " |
927 | "'%s/filter' entry\n", name); | |
8b372562 | 928 | } |
e1112b4d | 929 | |
8ae79a13 SR |
930 | entry = trace_create_file("enable", 0644, system->entry, |
931 | (void *)system->name, | |
932 | &ftrace_system_enable_fops); | |
933 | ||
6ecc2d1c SR |
934 | return system->entry; |
935 | } | |
936 | ||
1473e441 | 937 | static int |
701970b3 SR |
938 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
939 | const struct file_operations *id, | |
940 | const struct file_operations *enable, | |
941 | const struct file_operations *filter, | |
942 | const struct file_operations *format) | |
1473e441 SR |
943 | { |
944 | struct dentry *entry; | |
fd994989 | 945 | int ret; |
1473e441 | 946 | |
6ecc2d1c SR |
947 | /* |
948 | * If the trace point header did not define TRACE_SYSTEM | |
949 | * then the system would be called "TRACE_SYSTEM". | |
950 | */ | |
6d723736 | 951 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
6ecc2d1c SR |
952 | d_events = event_subsystem_dir(call->system, d_events); |
953 | ||
1473e441 SR |
954 | call->dir = debugfs_create_dir(call->name, d_events); |
955 | if (!call->dir) { | |
956 | pr_warning("Could not create debugfs " | |
957 | "'%s' directory\n", call->name); | |
958 | return -1; | |
959 | } | |
960 | ||
6d723736 SR |
961 | if (call->regfunc) |
962 | entry = trace_create_file("enable", 0644, call->dir, call, | |
701970b3 | 963 | enable); |
1473e441 | 964 | |
af6af30c | 965 | if (call->id && call->profile_enable) |
6d723736 | 966 | entry = trace_create_file("id", 0444, call->dir, call, |
701970b3 | 967 | id); |
23725aee | 968 | |
cf027f64 | 969 | if (call->define_fields) { |
14be96c9 | 970 | ret = call->define_fields(call); |
cf027f64 TZ |
971 | if (ret < 0) { |
972 | pr_warning("Could not initialize trace point" | |
973 | " events/%s\n", call->name); | |
974 | return ret; | |
975 | } | |
6d723736 | 976 | entry = trace_create_file("filter", 0644, call->dir, call, |
701970b3 | 977 | filter); |
cf027f64 TZ |
978 | } |
979 | ||
981d081e SR |
980 | /* A trace may not want to export its format */ |
981 | if (!call->show_format) | |
982 | return 0; | |
983 | ||
6d723736 | 984 | entry = trace_create_file("format", 0444, call->dir, call, |
701970b3 | 985 | format); |
6d723736 SR |
986 | |
987 | return 0; | |
988 | } | |
989 | ||
bd1a5c84 MH |
990 | static int __trace_add_event_call(struct ftrace_event_call *call) |
991 | { | |
992 | struct dentry *d_events; | |
993 | int ret; | |
6d723736 | 994 | |
bd1a5c84 MH |
995 | if (!call->name) |
996 | return -EINVAL; | |
701970b3 | 997 | |
bd1a5c84 MH |
998 | if (call->raw_init) { |
999 | ret = call->raw_init(call); | |
1000 | if (ret < 0) { | |
1001 | if (ret != -ENOSYS) | |
1002 | pr_warning("Could not initialize trace " | |
1003 | "events/%s\n", call->name); | |
1004 | return ret; | |
1005 | } | |
1006 | } | |
701970b3 | 1007 | |
bd1a5c84 MH |
1008 | d_events = event_trace_events_dir(); |
1009 | if (!d_events) | |
1010 | return -ENOENT; | |
1011 | ||
1012 | list_add(&call->list, &ftrace_events); | |
1013 | return event_create_dir(call, d_events, &ftrace_event_id_fops, | |
1014 | &ftrace_enable_fops, &ftrace_event_filter_fops, | |
1015 | &ftrace_event_format_fops); | |
1016 | } | |
1017 | ||
1018 | /* Add an additional event_call dynamically */ | |
1019 | int trace_add_event_call(struct ftrace_event_call *call) | |
1020 | { | |
1021 | int ret; | |
1022 | mutex_lock(&event_mutex); | |
1023 | ret = __trace_add_event_call(call); | |
1024 | mutex_unlock(&event_mutex); | |
1025 | return ret; | |
1026 | } | |
701970b3 | 1027 | |
a2ca5e03 FW |
1028 | static void remove_subsystem_dir(const char *name) |
1029 | { | |
1030 | struct event_subsystem *system; | |
1031 | ||
1032 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1033 | return; | |
1034 | ||
1035 | list_for_each_entry(system, &event_subsystems, list) { | |
1036 | if (strcmp(system->name, name) == 0) { | |
1037 | if (!--system->nr_events) { | |
1038 | struct event_filter *filter = system->filter; | |
1039 | ||
1040 | debugfs_remove_recursive(system->entry); | |
1041 | list_del(&system->list); | |
1042 | if (filter) { | |
1043 | kfree(filter->filter_string); | |
1044 | kfree(filter); | |
1045 | } | |
1046 | kfree(system->name); | |
1047 | kfree(system); | |
1048 | } | |
1049 | break; | |
1050 | } | |
1051 | } | |
1052 | } | |
1053 | ||
bd1a5c84 MH |
1054 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1055 | { | |
1056 | ftrace_event_enable_disable(call, 0); | |
1057 | if (call->event) | |
1058 | __unregister_ftrace_event(call->event); | |
1059 | debugfs_remove_recursive(call->dir); | |
1060 | list_del(&call->list); | |
1061 | trace_destroy_fields(call); | |
1062 | destroy_preds(call); | |
1063 | remove_subsystem_dir(call->system); | |
1064 | } | |
1065 | ||
1066 | /* Remove an event_call */ | |
1067 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1068 | { | |
1069 | mutex_lock(&event_mutex); | |
1070 | __trace_remove_event_call(call); | |
1071 | mutex_unlock(&event_mutex); | |
1072 | } | |
1073 | ||
1074 | #define for_each_event(event, start, end) \ | |
1075 | for (event = start; \ | |
1076 | (unsigned long)event < (unsigned long)end; \ | |
1077 | event++) | |
1078 | ||
1079 | #ifdef CONFIG_MODULES | |
1080 | ||
1081 | static LIST_HEAD(ftrace_module_file_list); | |
1082 | ||
1083 | /* | |
1084 | * Modules must own their file_operations to keep up with | |
1085 | * reference counting. | |
1086 | */ | |
1087 | struct ftrace_module_file_ops { | |
1088 | struct list_head list; | |
1089 | struct module *mod; | |
1090 | struct file_operations id; | |
1091 | struct file_operations enable; | |
1092 | struct file_operations format; | |
1093 | struct file_operations filter; | |
1094 | }; | |
1095 | ||
701970b3 SR |
1096 | static struct ftrace_module_file_ops * |
1097 | trace_create_file_ops(struct module *mod) | |
1098 | { | |
1099 | struct ftrace_module_file_ops *file_ops; | |
1100 | ||
1101 | /* | |
1102 | * This is a bit of a PITA. To allow for correct reference | |
1103 | * counting, modules must "own" their file_operations. | |
1104 | * To do this, we allocate the file operations that will be | |
1105 | * used in the event directory. | |
1106 | */ | |
1107 | ||
1108 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1109 | if (!file_ops) | |
1110 | return NULL; | |
1111 | ||
1112 | file_ops->mod = mod; | |
1113 | ||
1114 | file_ops->id = ftrace_event_id_fops; | |
1115 | file_ops->id.owner = mod; | |
1116 | ||
1117 | file_ops->enable = ftrace_enable_fops; | |
1118 | file_ops->enable.owner = mod; | |
1119 | ||
1120 | file_ops->filter = ftrace_event_filter_fops; | |
1121 | file_ops->filter.owner = mod; | |
1122 | ||
1123 | file_ops->format = ftrace_event_format_fops; | |
1124 | file_ops->format.owner = mod; | |
1125 | ||
1126 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1127 | ||
1128 | return file_ops; | |
1129 | } | |
1130 | ||
6d723736 SR |
1131 | static void trace_module_add_events(struct module *mod) |
1132 | { | |
701970b3 | 1133 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
1134 | struct ftrace_event_call *call, *start, *end; |
1135 | struct dentry *d_events; | |
f744bd57 | 1136 | int ret; |
6d723736 SR |
1137 | |
1138 | start = mod->trace_events; | |
1139 | end = mod->trace_events + mod->num_trace_events; | |
1140 | ||
1141 | if (start == end) | |
1142 | return; | |
1143 | ||
1144 | d_events = event_trace_events_dir(); | |
1145 | if (!d_events) | |
1146 | return; | |
1147 | ||
1148 | for_each_event(call, start, end) { | |
1149 | /* The linker may leave blanks */ | |
1150 | if (!call->name) | |
1151 | continue; | |
f744bd57 | 1152 | if (call->raw_init) { |
bd1a5c84 | 1153 | ret = call->raw_init(call); |
f744bd57 JB |
1154 | if (ret < 0) { |
1155 | if (ret != -ENOSYS) | |
1156 | pr_warning("Could not initialize trace " | |
1157 | "point events/%s\n", call->name); | |
1158 | continue; | |
1159 | } | |
1160 | } | |
701970b3 SR |
1161 | /* |
1162 | * This module has events, create file ops for this module | |
1163 | * if not already done. | |
1164 | */ | |
1165 | if (!file_ops) { | |
1166 | file_ops = trace_create_file_ops(mod); | |
1167 | if (!file_ops) | |
1168 | return; | |
1169 | } | |
6d723736 SR |
1170 | call->mod = mod; |
1171 | list_add(&call->list, &ftrace_events); | |
701970b3 SR |
1172 | event_create_dir(call, d_events, |
1173 | &file_ops->id, &file_ops->enable, | |
1174 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1175 | } |
1176 | } | |
1177 | ||
1178 | static void trace_module_remove_events(struct module *mod) | |
1179 | { | |
701970b3 | 1180 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1181 | struct ftrace_event_call *call, *p; |
9456f0fa | 1182 | bool found = false; |
6d723736 | 1183 | |
110bf2b7 | 1184 | down_write(&trace_event_mutex); |
6d723736 SR |
1185 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1186 | if (call->mod == mod) { | |
9456f0fa | 1187 | found = true; |
bd1a5c84 | 1188 | __trace_remove_event_call(call); |
6d723736 SR |
1189 | } |
1190 | } | |
701970b3 SR |
1191 | |
1192 | /* Now free the file_operations */ | |
1193 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1194 | if (file_ops->mod == mod) | |
1195 | break; | |
1196 | } | |
1197 | if (&file_ops->list != &ftrace_module_file_list) { | |
1198 | list_del(&file_ops->list); | |
1199 | kfree(file_ops); | |
1200 | } | |
9456f0fa SR |
1201 | |
1202 | /* | |
1203 | * It is safest to reset the ring buffer if the module being unloaded | |
1204 | * registered any events. | |
1205 | */ | |
1206 | if (found) | |
1207 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1208 | up_write(&trace_event_mutex); |
6d723736 SR |
1209 | } |
1210 | ||
61f919a1 SR |
1211 | static int trace_module_notify(struct notifier_block *self, |
1212 | unsigned long val, void *data) | |
6d723736 SR |
1213 | { |
1214 | struct module *mod = data; | |
1215 | ||
1216 | mutex_lock(&event_mutex); | |
1217 | switch (val) { | |
1218 | case MODULE_STATE_COMING: | |
1219 | trace_module_add_events(mod); | |
1220 | break; | |
1221 | case MODULE_STATE_GOING: | |
1222 | trace_module_remove_events(mod); | |
1223 | break; | |
1224 | } | |
1225 | mutex_unlock(&event_mutex); | |
fd994989 | 1226 | |
1473e441 SR |
1227 | return 0; |
1228 | } | |
61f919a1 SR |
1229 | #else |
1230 | static int trace_module_notify(struct notifier_block *self, | |
1231 | unsigned long val, void *data) | |
1232 | { | |
1233 | return 0; | |
1234 | } | |
1235 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1236 | |
6d723736 SR |
1237 | struct notifier_block trace_module_nb = { |
1238 | .notifier_call = trace_module_notify, | |
1239 | .priority = 0, | |
1240 | }; | |
1241 | ||
a59fd602 SR |
1242 | extern struct ftrace_event_call __start_ftrace_events[]; |
1243 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
1244 | ||
020e5f85 LZ |
1245 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1246 | ||
1247 | static __init int setup_trace_event(char *str) | |
1248 | { | |
1249 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1250 | ring_buffer_expanded = 1; | |
1251 | tracing_selftest_disabled = 1; | |
1252 | ||
1253 | return 1; | |
1254 | } | |
1255 | __setup("trace_event=", setup_trace_event); | |
1256 | ||
b77e38aa SR |
1257 | static __init int event_trace_init(void) |
1258 | { | |
a59fd602 | 1259 | struct ftrace_event_call *call; |
b77e38aa SR |
1260 | struct dentry *d_tracer; |
1261 | struct dentry *entry; | |
1473e441 | 1262 | struct dentry *d_events; |
6d723736 | 1263 | int ret; |
020e5f85 LZ |
1264 | char *buf = bootup_event_buf; |
1265 | char *token; | |
b77e38aa SR |
1266 | |
1267 | d_tracer = tracing_init_dentry(); | |
1268 | if (!d_tracer) | |
1269 | return 0; | |
1270 | ||
2314c4ae SR |
1271 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1272 | (void *)&show_event_seq_ops, | |
1273 | &ftrace_avail_fops); | |
1274 | if (!entry) | |
1275 | pr_warning("Could not create debugfs " | |
1276 | "'available_events' entry\n"); | |
1277 | ||
b77e38aa SR |
1278 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1279 | (void *)&show_set_event_seq_ops, | |
1280 | &ftrace_set_event_fops); | |
1281 | if (!entry) | |
1282 | pr_warning("Could not create debugfs " | |
1283 | "'set_event' entry\n"); | |
1284 | ||
1473e441 SR |
1285 | d_events = event_trace_events_dir(); |
1286 | if (!d_events) | |
1287 | return 0; | |
1288 | ||
d1b182a8 SR |
1289 | /* ring buffer internal formats */ |
1290 | trace_create_file("header_page", 0444, d_events, | |
1291 | ring_buffer_print_page_header, | |
1292 | &ftrace_show_header_fops); | |
1293 | ||
1294 | trace_create_file("header_event", 0444, d_events, | |
1295 | ring_buffer_print_entry_header, | |
1296 | &ftrace_show_header_fops); | |
1297 | ||
8ae79a13 | 1298 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1299 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1300 | |
6d723736 | 1301 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1302 | /* The linker may leave blanks */ |
1303 | if (!call->name) | |
1304 | continue; | |
f744bd57 | 1305 | if (call->raw_init) { |
bd1a5c84 | 1306 | ret = call->raw_init(call); |
f744bd57 JB |
1307 | if (ret < 0) { |
1308 | if (ret != -ENOSYS) | |
1309 | pr_warning("Could not initialize trace " | |
1310 | "point events/%s\n", call->name); | |
1311 | continue; | |
1312 | } | |
1313 | } | |
a59fd602 | 1314 | list_add(&call->list, &ftrace_events); |
701970b3 SR |
1315 | event_create_dir(call, d_events, &ftrace_event_id_fops, |
1316 | &ftrace_enable_fops, &ftrace_event_filter_fops, | |
1317 | &ftrace_event_format_fops); | |
1473e441 SR |
1318 | } |
1319 | ||
020e5f85 LZ |
1320 | while (true) { |
1321 | token = strsep(&buf, ","); | |
1322 | ||
1323 | if (!token) | |
1324 | break; | |
1325 | if (!*token) | |
1326 | continue; | |
1327 | ||
1328 | ret = ftrace_set_clr_event(token, 1); | |
1329 | if (ret) | |
1330 | pr_warning("Failed to enable trace event: %s\n", token); | |
1331 | } | |
1332 | ||
6d723736 | 1333 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1334 | if (ret) |
6d723736 SR |
1335 | pr_warning("Failed to register trace events module notifier\n"); |
1336 | ||
b77e38aa SR |
1337 | return 0; |
1338 | } | |
1339 | fs_initcall(event_trace_init); | |
e6187007 SR |
1340 | |
1341 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1342 | ||
1343 | static DEFINE_SPINLOCK(test_spinlock); | |
1344 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1345 | static DEFINE_MUTEX(test_mutex); | |
1346 | ||
1347 | static __init void test_work(struct work_struct *dummy) | |
1348 | { | |
1349 | spin_lock(&test_spinlock); | |
1350 | spin_lock_irq(&test_spinlock_irq); | |
1351 | udelay(1); | |
1352 | spin_unlock_irq(&test_spinlock_irq); | |
1353 | spin_unlock(&test_spinlock); | |
1354 | ||
1355 | mutex_lock(&test_mutex); | |
1356 | msleep(1); | |
1357 | mutex_unlock(&test_mutex); | |
1358 | } | |
1359 | ||
1360 | static __init int event_test_thread(void *unused) | |
1361 | { | |
1362 | void *test_malloc; | |
1363 | ||
1364 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1365 | if (!test_malloc) | |
1366 | pr_info("failed to kmalloc\n"); | |
1367 | ||
1368 | schedule_on_each_cpu(test_work); | |
1369 | ||
1370 | kfree(test_malloc); | |
1371 | ||
1372 | set_current_state(TASK_INTERRUPTIBLE); | |
1373 | while (!kthread_should_stop()) | |
1374 | schedule(); | |
1375 | ||
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | /* | |
1380 | * Do various things that may trigger events. | |
1381 | */ | |
1382 | static __init void event_test_stuff(void) | |
1383 | { | |
1384 | struct task_struct *test_thread; | |
1385 | ||
1386 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1387 | msleep(1); | |
1388 | kthread_stop(test_thread); | |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * For every trace event defined, we will test each trace point separately, | |
1393 | * and then by groups, and finally all trace points. | |
1394 | */ | |
9ea21c1e | 1395 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1396 | { |
1397 | struct ftrace_event_call *call; | |
1398 | struct event_subsystem *system; | |
e6187007 SR |
1399 | int ret; |
1400 | ||
1401 | pr_info("Running tests on trace events:\n"); | |
1402 | ||
1403 | list_for_each_entry(call, &ftrace_events, list) { | |
1404 | ||
1405 | /* Only test those that have a regfunc */ | |
1406 | if (!call->regfunc) | |
1407 | continue; | |
1408 | ||
1409 | pr_info("Testing event %s: ", call->name); | |
1410 | ||
1411 | /* | |
1412 | * If an event is already enabled, someone is using | |
1413 | * it and the self test should not be on. | |
1414 | */ | |
1415 | if (call->enabled) { | |
1416 | pr_warning("Enabled event during self test!\n"); | |
1417 | WARN_ON_ONCE(1); | |
1418 | continue; | |
1419 | } | |
1420 | ||
0e907c99 | 1421 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1422 | event_test_stuff(); |
0e907c99 | 1423 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1424 | |
1425 | pr_cont("OK\n"); | |
1426 | } | |
1427 | ||
1428 | /* Now test at the sub system level */ | |
1429 | ||
1430 | pr_info("Running tests on trace event systems:\n"); | |
1431 | ||
1432 | list_for_each_entry(system, &event_subsystems, list) { | |
1433 | ||
1434 | /* the ftrace system is special, skip it */ | |
1435 | if (strcmp(system->name, "ftrace") == 0) | |
1436 | continue; | |
1437 | ||
1438 | pr_info("Testing event system %s: ", system->name); | |
1439 | ||
8f31bfe5 | 1440 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1441 | if (WARN_ON_ONCE(ret)) { |
1442 | pr_warning("error enabling system %s\n", | |
1443 | system->name); | |
1444 | continue; | |
1445 | } | |
1446 | ||
1447 | event_test_stuff(); | |
1448 | ||
8f31bfe5 | 1449 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1450 | if (WARN_ON_ONCE(ret)) |
1451 | pr_warning("error disabling system %s\n", | |
1452 | system->name); | |
1453 | ||
1454 | pr_cont("OK\n"); | |
1455 | } | |
1456 | ||
1457 | /* Test with all events enabled */ | |
1458 | ||
1459 | pr_info("Running tests on all trace events:\n"); | |
1460 | pr_info("Testing all events: "); | |
1461 | ||
8f31bfe5 | 1462 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1463 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1464 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1465 | return; |
e6187007 SR |
1466 | } |
1467 | ||
1468 | event_test_stuff(); | |
1469 | ||
1470 | /* reset sysname */ | |
8f31bfe5 | 1471 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1472 | if (WARN_ON_ONCE(ret)) { |
1473 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1474 | return; |
e6187007 SR |
1475 | } |
1476 | ||
1477 | pr_cont("OK\n"); | |
9ea21c1e SR |
1478 | } |
1479 | ||
1480 | #ifdef CONFIG_FUNCTION_TRACER | |
1481 | ||
1482 | static DEFINE_PER_CPU(atomic_t, test_event_disable); | |
1483 | ||
1484 | static void | |
1485 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1486 | { | |
1487 | struct ring_buffer_event *event; | |
1488 | struct ftrace_entry *entry; | |
1489 | unsigned long flags; | |
1490 | long disabled; | |
1491 | int resched; | |
1492 | int cpu; | |
1493 | int pc; | |
1494 | ||
1495 | pc = preempt_count(); | |
1496 | resched = ftrace_preempt_disable(); | |
1497 | cpu = raw_smp_processor_id(); | |
1498 | disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu)); | |
1499 | ||
1500 | if (disabled != 1) | |
1501 | goto out; | |
1502 | ||
1503 | local_save_flags(flags); | |
1504 | ||
1505 | event = trace_current_buffer_lock_reserve(TRACE_FN, sizeof(*entry), | |
1506 | flags, pc); | |
1507 | if (!event) | |
1508 | goto out; | |
1509 | entry = ring_buffer_event_data(event); | |
1510 | entry->ip = ip; | |
1511 | entry->parent_ip = parent_ip; | |
1512 | ||
cb4764a6 | 1513 | trace_nowake_buffer_unlock_commit(event, flags, pc); |
9ea21c1e SR |
1514 | |
1515 | out: | |
1516 | atomic_dec(&per_cpu(test_event_disable, cpu)); | |
1517 | ftrace_preempt_enable(resched); | |
1518 | } | |
1519 | ||
1520 | static struct ftrace_ops trace_ops __initdata = | |
1521 | { | |
1522 | .func = function_test_events_call, | |
1523 | }; | |
1524 | ||
1525 | static __init void event_trace_self_test_with_function(void) | |
1526 | { | |
1527 | register_ftrace_function(&trace_ops); | |
1528 | pr_info("Running tests again, along with the function tracer\n"); | |
1529 | event_trace_self_tests(); | |
1530 | unregister_ftrace_function(&trace_ops); | |
1531 | } | |
1532 | #else | |
1533 | static __init void event_trace_self_test_with_function(void) | |
1534 | { | |
1535 | } | |
1536 | #endif | |
1537 | ||
1538 | static __init int event_trace_self_tests_init(void) | |
1539 | { | |
020e5f85 LZ |
1540 | if (!tracing_selftest_disabled) { |
1541 | event_trace_self_tests(); | |
1542 | event_trace_self_test_with_function(); | |
1543 | } | |
e6187007 SR |
1544 | |
1545 | return 0; | |
1546 | } | |
1547 | ||
28d20e2d | 1548 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1549 | |
1550 | #endif |