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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 | |
020e5f85 LZ |
20 | #include <asm/setup.h> |
21 | ||
91729ef9 | 22 | #include "trace_output.h" |
b77e38aa | 23 | |
4e5292ea | 24 | #undef TRACE_SYSTEM |
b628b3e6 SR |
25 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
26 | ||
20c8928a | 27 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 28 | |
a59fd602 SR |
29 | LIST_HEAD(ftrace_events); |
30 | ||
aeaeae11 FW |
31 | int trace_define_field(struct ftrace_event_call *call, const char *type, |
32 | const char *name, int offset, int size, int is_signed, | |
43b51ead | 33 | int filter_type) |
cf027f64 TZ |
34 | { |
35 | struct ftrace_event_field *field; | |
36 | ||
fe9f57f2 | 37 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
38 | if (!field) |
39 | goto err; | |
fe9f57f2 | 40 | |
cf027f64 TZ |
41 | field->name = kstrdup(name, GFP_KERNEL); |
42 | if (!field->name) | |
43 | goto err; | |
fe9f57f2 | 44 | |
cf027f64 TZ |
45 | field->type = kstrdup(type, GFP_KERNEL); |
46 | if (!field->type) | |
47 | goto err; | |
fe9f57f2 | 48 | |
43b51ead LZ |
49 | if (filter_type == FILTER_OTHER) |
50 | field->filter_type = filter_assign_type(type); | |
51 | else | |
52 | field->filter_type = filter_type; | |
53 | ||
cf027f64 TZ |
54 | field->offset = offset; |
55 | field->size = size; | |
a118e4d1 | 56 | field->is_signed = is_signed; |
aa38e9fc | 57 | |
cf027f64 TZ |
58 | list_add(&field->link, &call->fields); |
59 | ||
60 | return 0; | |
fe9f57f2 | 61 | |
cf027f64 | 62 | err: |
7b60997f | 63 | if (field) |
cf027f64 | 64 | kfree(field->name); |
cf027f64 | 65 | kfree(field); |
fe9f57f2 | 66 | |
cf027f64 TZ |
67 | return -ENOMEM; |
68 | } | |
17c873ec | 69 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 70 | |
e647d6b3 LZ |
71 | #define __common_field(type, item) \ |
72 | ret = trace_define_field(call, #type, "common_" #item, \ | |
73 | offsetof(typeof(ent), item), \ | |
74 | sizeof(ent.item), \ | |
43b51ead | 75 | is_signed_type(type), FILTER_OTHER); \ |
e647d6b3 LZ |
76 | if (ret) \ |
77 | return ret; | |
78 | ||
614a71a2 | 79 | static int trace_define_common_fields(struct ftrace_event_call *call) |
e647d6b3 LZ |
80 | { |
81 | int ret; | |
82 | struct trace_entry ent; | |
83 | ||
84 | __common_field(unsigned short, type); | |
85 | __common_field(unsigned char, flags); | |
86 | __common_field(unsigned char, preempt_count); | |
87 | __common_field(int, pid); | |
637e7e86 | 88 | __common_field(int, lock_depth); |
e647d6b3 LZ |
89 | |
90 | return ret; | |
91 | } | |
92 | ||
bd1a5c84 | 93 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
94 | { |
95 | struct ftrace_event_field *field, *next; | |
96 | ||
97 | list_for_each_entry_safe(field, next, &call->fields, link) { | |
98 | list_del(&field->link); | |
99 | kfree(field->type); | |
100 | kfree(field->name); | |
101 | kfree(field); | |
102 | } | |
103 | } | |
104 | ||
87d9b4e1 LZ |
105 | int trace_event_raw_init(struct ftrace_event_call *call) |
106 | { | |
107 | int id; | |
108 | ||
109 | id = register_ftrace_event(call->event); | |
110 | if (!id) | |
111 | return -ENODEV; | |
112 | call->id = id; | |
113 | INIT_LIST_HEAD(&call->fields); | |
114 | ||
115 | return 0; | |
116 | } | |
117 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
118 | ||
3b8e4273 | 119 | static int ftrace_event_enable_disable(struct ftrace_event_call *call, |
fd994989 SR |
120 | int enable) |
121 | { | |
3b8e4273 LZ |
122 | int ret = 0; |
123 | ||
fd994989 SR |
124 | switch (enable) { |
125 | case 0: | |
126 | if (call->enabled) { | |
127 | call->enabled = 0; | |
b11c53e1 | 128 | tracing_stop_cmdline_record(); |
bd1a5c84 | 129 | call->unregfunc(call); |
fd994989 | 130 | } |
fd994989 SR |
131 | break; |
132 | case 1: | |
da4d0302 | 133 | if (!call->enabled) { |
b11c53e1 | 134 | tracing_start_cmdline_record(); |
3b8e4273 LZ |
135 | ret = call->regfunc(call); |
136 | if (ret) { | |
137 | tracing_stop_cmdline_record(); | |
138 | pr_info("event trace: Could not enable event " | |
139 | "%s\n", call->name); | |
140 | break; | |
141 | } | |
142 | call->enabled = 1; | |
fd994989 | 143 | } |
fd994989 SR |
144 | break; |
145 | } | |
3b8e4273 LZ |
146 | |
147 | return ret; | |
fd994989 SR |
148 | } |
149 | ||
0e907c99 Z |
150 | static void ftrace_clear_events(void) |
151 | { | |
152 | struct ftrace_event_call *call; | |
153 | ||
154 | mutex_lock(&event_mutex); | |
155 | list_for_each_entry(call, &ftrace_events, list) { | |
156 | ftrace_event_enable_disable(call, 0); | |
157 | } | |
158 | mutex_unlock(&event_mutex); | |
159 | } | |
160 | ||
8f31bfe5 LZ |
161 | /* |
162 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
163 | */ | |
164 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
165 | const char *event, int set) | |
b77e38aa | 166 | { |
a59fd602 | 167 | struct ftrace_event_call *call; |
29f93943 | 168 | int ret = -EINVAL; |
8f31bfe5 LZ |
169 | |
170 | mutex_lock(&event_mutex); | |
171 | list_for_each_entry(call, &ftrace_events, list) { | |
172 | ||
173 | if (!call->name || !call->regfunc) | |
174 | continue; | |
175 | ||
176 | if (match && | |
177 | strcmp(match, call->name) != 0 && | |
178 | strcmp(match, call->system) != 0) | |
179 | continue; | |
180 | ||
181 | if (sub && strcmp(sub, call->system) != 0) | |
182 | continue; | |
183 | ||
184 | if (event && strcmp(event, call->name) != 0) | |
185 | continue; | |
186 | ||
187 | ftrace_event_enable_disable(call, set); | |
188 | ||
189 | ret = 0; | |
190 | } | |
191 | mutex_unlock(&event_mutex); | |
192 | ||
193 | return ret; | |
194 | } | |
195 | ||
196 | static int ftrace_set_clr_event(char *buf, int set) | |
197 | { | |
b628b3e6 | 198 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
199 | |
200 | /* | |
201 | * The buf format can be <subsystem>:<event-name> | |
202 | * *:<event-name> means any event by that name. | |
203 | * :<event-name> is the same. | |
204 | * | |
205 | * <subsystem>:* means all events in that subsystem | |
206 | * <subsystem>: means the same. | |
207 | * | |
208 | * <name> (no ':') means all events in a subsystem with | |
209 | * the name <name> or any event that matches <name> | |
210 | */ | |
211 | ||
212 | match = strsep(&buf, ":"); | |
213 | if (buf) { | |
214 | sub = match; | |
215 | event = buf; | |
216 | match = NULL; | |
217 | ||
218 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
219 | sub = NULL; | |
220 | if (!strlen(event) || strcmp(event, "*") == 0) | |
221 | event = NULL; | |
222 | } | |
b77e38aa | 223 | |
8f31bfe5 | 224 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
225 | } |
226 | ||
4671c794 SR |
227 | /** |
228 | * trace_set_clr_event - enable or disable an event | |
229 | * @system: system name to match (NULL for any system) | |
230 | * @event: event name to match (NULL for all events, within system) | |
231 | * @set: 1 to enable, 0 to disable | |
232 | * | |
233 | * This is a way for other parts of the kernel to enable or disable | |
234 | * event recording. | |
235 | * | |
236 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
237 | * registered events. | |
238 | */ | |
239 | int trace_set_clr_event(const char *system, const char *event, int set) | |
240 | { | |
241 | return __ftrace_set_clr_event(NULL, system, event, set); | |
242 | } | |
243 | ||
b77e38aa SR |
244 | /* 128 should be much more than enough */ |
245 | #define EVENT_BUF_SIZE 127 | |
246 | ||
247 | static ssize_t | |
248 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
249 | size_t cnt, loff_t *ppos) | |
250 | { | |
48966364 | 251 | struct trace_parser parser; |
4ba7978e | 252 | ssize_t read, ret; |
b77e38aa | 253 | |
4ba7978e | 254 | if (!cnt) |
b77e38aa SR |
255 | return 0; |
256 | ||
1852fcce SR |
257 | ret = tracing_update_buffers(); |
258 | if (ret < 0) | |
259 | return ret; | |
260 | ||
48966364 | 261 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
262 | return -ENOMEM; |
263 | ||
48966364 | 264 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
265 | ||
4ba7978e | 266 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 267 | int set = 1; |
b77e38aa | 268 | |
48966364 | 269 | if (*parser.buffer == '!') |
b77e38aa | 270 | set = 0; |
b77e38aa | 271 | |
48966364 | 272 | parser.buffer[parser.idx] = 0; |
273 | ||
274 | ret = ftrace_set_clr_event(parser.buffer + !set, set); | |
b77e38aa | 275 | if (ret) |
48966364 | 276 | goto out_put; |
b77e38aa | 277 | } |
b77e38aa SR |
278 | |
279 | ret = read; | |
280 | ||
48966364 | 281 | out_put: |
282 | trace_parser_put(&parser); | |
b77e38aa SR |
283 | |
284 | return ret; | |
285 | } | |
286 | ||
287 | static void * | |
288 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
289 | { | |
30bd39cd | 290 | struct ftrace_event_call *call = v; |
b77e38aa SR |
291 | |
292 | (*pos)++; | |
293 | ||
30bd39cd | 294 | list_for_each_entry_continue(call, &ftrace_events, list) { |
40e26815 SR |
295 | /* |
296 | * The ftrace subsystem is for showing formats only. | |
297 | * They can not be enabled or disabled via the event files. | |
298 | */ | |
299 | if (call->regfunc) | |
30bd39cd | 300 | return call; |
40e26815 | 301 | } |
b77e38aa | 302 | |
30bd39cd | 303 | return NULL; |
b77e38aa SR |
304 | } |
305 | ||
306 | static void *t_start(struct seq_file *m, loff_t *pos) | |
307 | { | |
30bd39cd | 308 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
309 | loff_t l; |
310 | ||
20c8928a | 311 | mutex_lock(&event_mutex); |
e1c7e2a6 | 312 | |
30bd39cd | 313 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 314 | for (l = 0; l <= *pos; ) { |
30bd39cd | 315 | call = t_next(m, call, &l); |
e1c7e2a6 LZ |
316 | if (!call) |
317 | break; | |
318 | } | |
319 | return call; | |
b77e38aa SR |
320 | } |
321 | ||
322 | static void * | |
323 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
324 | { | |
30bd39cd | 325 | struct ftrace_event_call *call = v; |
b77e38aa SR |
326 | |
327 | (*pos)++; | |
328 | ||
30bd39cd LZ |
329 | list_for_each_entry_continue(call, &ftrace_events, list) { |
330 | if (call->enabled) | |
331 | return call; | |
b77e38aa SR |
332 | } |
333 | ||
30bd39cd | 334 | return NULL; |
b77e38aa SR |
335 | } |
336 | ||
337 | static void *s_start(struct seq_file *m, loff_t *pos) | |
338 | { | |
30bd39cd | 339 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
340 | loff_t l; |
341 | ||
20c8928a | 342 | mutex_lock(&event_mutex); |
e1c7e2a6 | 343 | |
30bd39cd | 344 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 345 | for (l = 0; l <= *pos; ) { |
30bd39cd | 346 | call = s_next(m, call, &l); |
e1c7e2a6 LZ |
347 | if (!call) |
348 | break; | |
349 | } | |
350 | return call; | |
b77e38aa SR |
351 | } |
352 | ||
353 | static int t_show(struct seq_file *m, void *v) | |
354 | { | |
355 | struct ftrace_event_call *call = v; | |
356 | ||
b628b3e6 SR |
357 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
358 | seq_printf(m, "%s:", call->system); | |
b77e38aa SR |
359 | seq_printf(m, "%s\n", call->name); |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | static void t_stop(struct seq_file *m, void *p) | |
365 | { | |
20c8928a | 366 | mutex_unlock(&event_mutex); |
b77e38aa SR |
367 | } |
368 | ||
369 | static int | |
370 | ftrace_event_seq_open(struct inode *inode, struct file *file) | |
371 | { | |
b77e38aa SR |
372 | const struct seq_operations *seq_ops; |
373 | ||
374 | if ((file->f_mode & FMODE_WRITE) && | |
8650ae32 | 375 | (file->f_flags & O_TRUNC)) |
b77e38aa SR |
376 | ftrace_clear_events(); |
377 | ||
378 | seq_ops = inode->i_private; | |
20c8928a | 379 | return seq_open(file, seq_ops); |
b77e38aa SR |
380 | } |
381 | ||
1473e441 SR |
382 | static ssize_t |
383 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
384 | loff_t *ppos) | |
385 | { | |
386 | struct ftrace_event_call *call = filp->private_data; | |
387 | char *buf; | |
388 | ||
da4d0302 | 389 | if (call->enabled) |
1473e441 SR |
390 | buf = "1\n"; |
391 | else | |
392 | buf = "0\n"; | |
393 | ||
394 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
395 | } | |
396 | ||
397 | static ssize_t | |
398 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
399 | loff_t *ppos) | |
400 | { | |
401 | struct ftrace_event_call *call = filp->private_data; | |
402 | char buf[64]; | |
403 | unsigned long val; | |
404 | int ret; | |
405 | ||
406 | if (cnt >= sizeof(buf)) | |
407 | return -EINVAL; | |
408 | ||
409 | if (copy_from_user(&buf, ubuf, cnt)) | |
410 | return -EFAULT; | |
411 | ||
412 | buf[cnt] = 0; | |
413 | ||
414 | ret = strict_strtoul(buf, 10, &val); | |
415 | if (ret < 0) | |
416 | return ret; | |
417 | ||
1852fcce SR |
418 | ret = tracing_update_buffers(); |
419 | if (ret < 0) | |
420 | return ret; | |
421 | ||
1473e441 SR |
422 | switch (val) { |
423 | case 0: | |
1473e441 | 424 | case 1: |
11a241a3 | 425 | mutex_lock(&event_mutex); |
3b8e4273 | 426 | ret = ftrace_event_enable_disable(call, val); |
11a241a3 | 427 | mutex_unlock(&event_mutex); |
1473e441 SR |
428 | break; |
429 | ||
430 | default: | |
431 | return -EINVAL; | |
432 | } | |
433 | ||
434 | *ppos += cnt; | |
435 | ||
3b8e4273 | 436 | return ret ? ret : cnt; |
1473e441 SR |
437 | } |
438 | ||
8ae79a13 SR |
439 | static ssize_t |
440 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
441 | loff_t *ppos) | |
442 | { | |
c142b15d | 443 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
8ae79a13 SR |
444 | const char *system = filp->private_data; |
445 | struct ftrace_event_call *call; | |
446 | char buf[2]; | |
c142b15d | 447 | int set = 0; |
8ae79a13 SR |
448 | int ret; |
449 | ||
8ae79a13 SR |
450 | mutex_lock(&event_mutex); |
451 | list_for_each_entry(call, &ftrace_events, list) { | |
452 | if (!call->name || !call->regfunc) | |
453 | continue; | |
454 | ||
8f31bfe5 | 455 | if (system && strcmp(call->system, system) != 0) |
8ae79a13 SR |
456 | continue; |
457 | ||
458 | /* | |
459 | * We need to find out if all the events are set | |
460 | * or if all events or cleared, or if we have | |
461 | * a mixture. | |
462 | */ | |
c142b15d LZ |
463 | set |= (1 << !!call->enabled); |
464 | ||
8ae79a13 SR |
465 | /* |
466 | * If we have a mixture, no need to look further. | |
467 | */ | |
c142b15d | 468 | if (set == 3) |
8ae79a13 SR |
469 | break; |
470 | } | |
471 | mutex_unlock(&event_mutex); | |
472 | ||
c142b15d | 473 | buf[0] = set_to_char[set]; |
8ae79a13 | 474 | buf[1] = '\n'; |
8ae79a13 SR |
475 | |
476 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
477 | ||
478 | return ret; | |
479 | } | |
480 | ||
481 | static ssize_t | |
482 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
483 | loff_t *ppos) | |
484 | { | |
485 | const char *system = filp->private_data; | |
486 | unsigned long val; | |
8ae79a13 SR |
487 | char buf[64]; |
488 | ssize_t ret; | |
489 | ||
490 | if (cnt >= sizeof(buf)) | |
491 | return -EINVAL; | |
492 | ||
493 | if (copy_from_user(&buf, ubuf, cnt)) | |
494 | return -EFAULT; | |
495 | ||
496 | buf[cnt] = 0; | |
497 | ||
498 | ret = strict_strtoul(buf, 10, &val); | |
499 | if (ret < 0) | |
500 | return ret; | |
501 | ||
502 | ret = tracing_update_buffers(); | |
503 | if (ret < 0) | |
504 | return ret; | |
505 | ||
8f31bfe5 | 506 | if (val != 0 && val != 1) |
8ae79a13 | 507 | return -EINVAL; |
8ae79a13 | 508 | |
8f31bfe5 | 509 | ret = __ftrace_set_clr_event(NULL, system, NULL, val); |
8ae79a13 | 510 | if (ret) |
8f31bfe5 | 511 | goto out; |
8ae79a13 SR |
512 | |
513 | ret = cnt; | |
514 | ||
8f31bfe5 | 515 | out: |
8ae79a13 SR |
516 | *ppos += cnt; |
517 | ||
518 | return ret; | |
519 | } | |
520 | ||
981d081e SR |
521 | static ssize_t |
522 | event_format_read(struct file *filp, char __user *ubuf, size_t cnt, | |
523 | loff_t *ppos) | |
524 | { | |
525 | struct ftrace_event_call *call = filp->private_data; | |
5a65e956 | 526 | struct ftrace_event_field *field; |
981d081e | 527 | struct trace_seq *s; |
5a65e956 | 528 | int common_field_count = 5; |
981d081e | 529 | char *buf; |
5a65e956 | 530 | int r = 0; |
981d081e | 531 | |
c269fc8c TZ |
532 | if (*ppos) |
533 | return 0; | |
534 | ||
981d081e SR |
535 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
536 | if (!s) | |
537 | return -ENOMEM; | |
538 | ||
539 | trace_seq_init(s); | |
540 | ||
c5e4e192 SR |
541 | trace_seq_printf(s, "name: %s\n", call->name); |
542 | trace_seq_printf(s, "ID: %d\n", call->id); | |
543 | trace_seq_printf(s, "format:\n"); | |
91729ef9 | 544 | |
5a65e956 LJ |
545 | list_for_each_entry_reverse(field, &call->fields, link) { |
546 | /* | |
547 | * Smartly shows the array type(except dynamic array). | |
548 | * Normal: | |
549 | * field:TYPE VAR | |
550 | * If TYPE := TYPE[LEN], it is shown: | |
551 | * field:TYPE VAR[LEN] | |
552 | */ | |
553 | const char *array_descriptor = strchr(field->type, '['); | |
554 | ||
555 | if (!strncmp(field->type, "__data_loc", 10)) | |
556 | array_descriptor = NULL; | |
557 | ||
558 | if (!array_descriptor) { | |
559 | r = trace_seq_printf(s, "\tfield:%s %s;\toffset:%u;" | |
560 | "\tsize:%u;\tsigned:%d;\n", | |
561 | field->type, field->name, field->offset, | |
562 | field->size, !!field->is_signed); | |
563 | } else { | |
564 | r = trace_seq_printf(s, "\tfield:%.*s %s%s;\toffset:%u;" | |
565 | "\tsize:%u;\tsigned:%d;\n", | |
566 | (int)(array_descriptor - field->type), | |
567 | field->type, field->name, | |
568 | array_descriptor, field->offset, | |
569 | field->size, !!field->is_signed); | |
570 | } | |
571 | ||
572 | if (--common_field_count == 0) | |
573 | r = trace_seq_printf(s, "\n"); | |
574 | ||
575 | if (!r) | |
576 | break; | |
577 | } | |
578 | ||
579 | if (r) | |
580 | r = trace_seq_printf(s, "\nprint fmt: %s\n", | |
581 | call->print_fmt); | |
582 | ||
981d081e SR |
583 | if (!r) { |
584 | /* | |
585 | * ug! The format output is bigger than a PAGE!! | |
586 | */ | |
587 | buf = "FORMAT TOO BIG\n"; | |
588 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
589 | buf, strlen(buf)); | |
590 | goto out; | |
591 | } | |
592 | ||
593 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
594 | s->buffer, s->len); | |
595 | out: | |
596 | kfree(s); | |
597 | return r; | |
598 | } | |
599 | ||
23725aee PZ |
600 | static ssize_t |
601 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
602 | { | |
603 | struct ftrace_event_call *call = filp->private_data; | |
604 | struct trace_seq *s; | |
605 | int r; | |
606 | ||
607 | if (*ppos) | |
608 | return 0; | |
609 | ||
610 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
611 | if (!s) | |
612 | return -ENOMEM; | |
613 | ||
614 | trace_seq_init(s); | |
615 | trace_seq_printf(s, "%d\n", call->id); | |
616 | ||
617 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
618 | s->buffer, s->len); | |
619 | kfree(s); | |
620 | return r; | |
621 | } | |
622 | ||
7ce7e424 TZ |
623 | static ssize_t |
624 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
625 | loff_t *ppos) | |
626 | { | |
627 | struct ftrace_event_call *call = filp->private_data; | |
628 | struct trace_seq *s; | |
629 | int r; | |
630 | ||
631 | if (*ppos) | |
632 | return 0; | |
633 | ||
634 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
635 | if (!s) | |
636 | return -ENOMEM; | |
637 | ||
638 | trace_seq_init(s); | |
639 | ||
8b372562 | 640 | print_event_filter(call, s); |
4bda2d51 | 641 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
642 | |
643 | kfree(s); | |
644 | ||
645 | return r; | |
646 | } | |
647 | ||
648 | static ssize_t | |
649 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
650 | loff_t *ppos) | |
651 | { | |
652 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 653 | char *buf; |
7ce7e424 TZ |
654 | int err; |
655 | ||
8b372562 | 656 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
657 | return -EINVAL; |
658 | ||
8b372562 TZ |
659 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
660 | if (!buf) | |
7ce7e424 TZ |
661 | return -ENOMEM; |
662 | ||
8b372562 TZ |
663 | if (copy_from_user(buf, ubuf, cnt)) { |
664 | free_page((unsigned long) buf); | |
665 | return -EFAULT; | |
7ce7e424 | 666 | } |
8b372562 | 667 | buf[cnt] = '\0'; |
7ce7e424 | 668 | |
8b372562 TZ |
669 | err = apply_event_filter(call, buf); |
670 | free_page((unsigned long) buf); | |
671 | if (err < 0) | |
44e9c8b7 | 672 | return err; |
0a19e53c | 673 | |
7ce7e424 TZ |
674 | *ppos += cnt; |
675 | ||
676 | return cnt; | |
677 | } | |
678 | ||
cfb180f3 TZ |
679 | static ssize_t |
680 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
681 | loff_t *ppos) | |
682 | { | |
683 | struct event_subsystem *system = filp->private_data; | |
684 | struct trace_seq *s; | |
685 | int r; | |
686 | ||
687 | if (*ppos) | |
688 | return 0; | |
689 | ||
690 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
691 | if (!s) | |
692 | return -ENOMEM; | |
693 | ||
694 | trace_seq_init(s); | |
695 | ||
8b372562 | 696 | print_subsystem_event_filter(system, s); |
4bda2d51 | 697 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
698 | |
699 | kfree(s); | |
700 | ||
701 | return r; | |
702 | } | |
703 | ||
704 | static ssize_t | |
705 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
706 | loff_t *ppos) | |
707 | { | |
708 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 709 | char *buf; |
cfb180f3 TZ |
710 | int err; |
711 | ||
8b372562 | 712 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
713 | return -EINVAL; |
714 | ||
8b372562 TZ |
715 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
716 | if (!buf) | |
cfb180f3 TZ |
717 | return -ENOMEM; |
718 | ||
8b372562 TZ |
719 | if (copy_from_user(buf, ubuf, cnt)) { |
720 | free_page((unsigned long) buf); | |
721 | return -EFAULT; | |
cfb180f3 | 722 | } |
8b372562 | 723 | buf[cnt] = '\0'; |
cfb180f3 | 724 | |
8b372562 TZ |
725 | err = apply_subsystem_event_filter(system, buf); |
726 | free_page((unsigned long) buf); | |
727 | if (err < 0) | |
44e9c8b7 | 728 | return err; |
cfb180f3 TZ |
729 | |
730 | *ppos += cnt; | |
731 | ||
732 | return cnt; | |
733 | } | |
734 | ||
d1b182a8 SR |
735 | static ssize_t |
736 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
737 | { | |
738 | int (*func)(struct trace_seq *s) = filp->private_data; | |
739 | struct trace_seq *s; | |
740 | int r; | |
741 | ||
742 | if (*ppos) | |
743 | return 0; | |
744 | ||
745 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
746 | if (!s) | |
747 | return -ENOMEM; | |
748 | ||
749 | trace_seq_init(s); | |
750 | ||
751 | func(s); | |
752 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
753 | ||
754 | kfree(s); | |
755 | ||
756 | return r; | |
757 | } | |
758 | ||
b77e38aa SR |
759 | static const struct seq_operations show_event_seq_ops = { |
760 | .start = t_start, | |
761 | .next = t_next, | |
762 | .show = t_show, | |
763 | .stop = t_stop, | |
764 | }; | |
765 | ||
766 | static const struct seq_operations show_set_event_seq_ops = { | |
767 | .start = s_start, | |
768 | .next = s_next, | |
769 | .show = t_show, | |
770 | .stop = t_stop, | |
771 | }; | |
772 | ||
2314c4ae SR |
773 | static const struct file_operations ftrace_avail_fops = { |
774 | .open = ftrace_event_seq_open, | |
775 | .read = seq_read, | |
776 | .llseek = seq_lseek, | |
777 | .release = seq_release, | |
778 | }; | |
779 | ||
b77e38aa SR |
780 | static const struct file_operations ftrace_set_event_fops = { |
781 | .open = ftrace_event_seq_open, | |
782 | .read = seq_read, | |
783 | .write = ftrace_event_write, | |
784 | .llseek = seq_lseek, | |
785 | .release = seq_release, | |
786 | }; | |
787 | ||
1473e441 SR |
788 | static const struct file_operations ftrace_enable_fops = { |
789 | .open = tracing_open_generic, | |
790 | .read = event_enable_read, | |
791 | .write = event_enable_write, | |
792 | }; | |
793 | ||
981d081e SR |
794 | static const struct file_operations ftrace_event_format_fops = { |
795 | .open = tracing_open_generic, | |
796 | .read = event_format_read, | |
797 | }; | |
798 | ||
23725aee PZ |
799 | static const struct file_operations ftrace_event_id_fops = { |
800 | .open = tracing_open_generic, | |
801 | .read = event_id_read, | |
802 | }; | |
803 | ||
7ce7e424 TZ |
804 | static const struct file_operations ftrace_event_filter_fops = { |
805 | .open = tracing_open_generic, | |
806 | .read = event_filter_read, | |
807 | .write = event_filter_write, | |
808 | }; | |
809 | ||
cfb180f3 TZ |
810 | static const struct file_operations ftrace_subsystem_filter_fops = { |
811 | .open = tracing_open_generic, | |
812 | .read = subsystem_filter_read, | |
813 | .write = subsystem_filter_write, | |
814 | }; | |
815 | ||
8ae79a13 SR |
816 | static const struct file_operations ftrace_system_enable_fops = { |
817 | .open = tracing_open_generic, | |
818 | .read = system_enable_read, | |
819 | .write = system_enable_write, | |
820 | }; | |
821 | ||
d1b182a8 SR |
822 | static const struct file_operations ftrace_show_header_fops = { |
823 | .open = tracing_open_generic, | |
824 | .read = show_header, | |
825 | }; | |
826 | ||
1473e441 SR |
827 | static struct dentry *event_trace_events_dir(void) |
828 | { | |
829 | static struct dentry *d_tracer; | |
830 | static struct dentry *d_events; | |
831 | ||
832 | if (d_events) | |
833 | return d_events; | |
834 | ||
835 | d_tracer = tracing_init_dentry(); | |
836 | if (!d_tracer) | |
837 | return NULL; | |
838 | ||
839 | d_events = debugfs_create_dir("events", d_tracer); | |
840 | if (!d_events) | |
841 | pr_warning("Could not create debugfs " | |
842 | "'events' directory\n"); | |
843 | ||
844 | return d_events; | |
845 | } | |
846 | ||
6ecc2d1c SR |
847 | static LIST_HEAD(event_subsystems); |
848 | ||
849 | static struct dentry * | |
850 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
851 | { | |
852 | struct event_subsystem *system; | |
e1112b4d | 853 | struct dentry *entry; |
6ecc2d1c SR |
854 | |
855 | /* First see if we did not already create this dir */ | |
856 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
857 | if (strcmp(system->name, name) == 0) { |
858 | system->nr_events++; | |
6ecc2d1c | 859 | return system->entry; |
dc82ec98 | 860 | } |
6ecc2d1c SR |
861 | } |
862 | ||
863 | /* need to create new entry */ | |
864 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
865 | if (!system) { | |
866 | pr_warning("No memory to create event subsystem %s\n", | |
867 | name); | |
868 | return d_events; | |
869 | } | |
870 | ||
871 | system->entry = debugfs_create_dir(name, d_events); | |
872 | if (!system->entry) { | |
873 | pr_warning("Could not create event subsystem %s\n", | |
874 | name); | |
875 | kfree(system); | |
876 | return d_events; | |
877 | } | |
878 | ||
dc82ec98 | 879 | system->nr_events = 1; |
6d723736 SR |
880 | system->name = kstrdup(name, GFP_KERNEL); |
881 | if (!system->name) { | |
882 | debugfs_remove(system->entry); | |
883 | kfree(system); | |
884 | return d_events; | |
885 | } | |
886 | ||
6ecc2d1c SR |
887 | list_add(&system->list, &event_subsystems); |
888 | ||
30e673b2 | 889 | system->filter = NULL; |
cfb180f3 | 890 | |
8b372562 TZ |
891 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
892 | if (!system->filter) { | |
893 | pr_warning("Could not allocate filter for subsystem " | |
894 | "'%s'\n", name); | |
895 | return system->entry; | |
896 | } | |
897 | ||
e1112b4d TZ |
898 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
899 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
900 | if (!entry) { |
901 | kfree(system->filter); | |
902 | system->filter = NULL; | |
e1112b4d TZ |
903 | pr_warning("Could not create debugfs " |
904 | "'%s/filter' entry\n", name); | |
8b372562 | 905 | } |
e1112b4d | 906 | |
f3f3f009 FW |
907 | trace_create_file("enable", 0644, system->entry, |
908 | (void *)system->name, | |
909 | &ftrace_system_enable_fops); | |
8ae79a13 | 910 | |
6ecc2d1c SR |
911 | return system->entry; |
912 | } | |
913 | ||
1473e441 | 914 | static int |
701970b3 SR |
915 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
916 | const struct file_operations *id, | |
917 | const struct file_operations *enable, | |
918 | const struct file_operations *filter, | |
919 | const struct file_operations *format) | |
1473e441 | 920 | { |
fd994989 | 921 | int ret; |
1473e441 | 922 | |
6ecc2d1c SR |
923 | /* |
924 | * If the trace point header did not define TRACE_SYSTEM | |
925 | * then the system would be called "TRACE_SYSTEM". | |
926 | */ | |
6d723736 | 927 | if (strcmp(call->system, TRACE_SYSTEM) != 0) |
6ecc2d1c SR |
928 | d_events = event_subsystem_dir(call->system, d_events); |
929 | ||
1473e441 SR |
930 | call->dir = debugfs_create_dir(call->name, d_events); |
931 | if (!call->dir) { | |
932 | pr_warning("Could not create debugfs " | |
933 | "'%s' directory\n", call->name); | |
934 | return -1; | |
935 | } | |
936 | ||
6d723736 | 937 | if (call->regfunc) |
f3f3f009 FW |
938 | trace_create_file("enable", 0644, call->dir, call, |
939 | enable); | |
1473e441 | 940 | |
af6af30c | 941 | if (call->id && call->profile_enable) |
f3f3f009 FW |
942 | trace_create_file("id", 0444, call->dir, call, |
943 | id); | |
23725aee | 944 | |
cf027f64 | 945 | if (call->define_fields) { |
614a71a2 LZ |
946 | ret = trace_define_common_fields(call); |
947 | if (!ret) | |
948 | ret = call->define_fields(call); | |
cf027f64 TZ |
949 | if (ret < 0) { |
950 | pr_warning("Could not initialize trace point" | |
951 | " events/%s\n", call->name); | |
952 | return ret; | |
953 | } | |
f3f3f009 FW |
954 | trace_create_file("filter", 0644, call->dir, call, |
955 | filter); | |
cf027f64 TZ |
956 | } |
957 | ||
f3f3f009 FW |
958 | trace_create_file("format", 0444, call->dir, call, |
959 | format); | |
6d723736 SR |
960 | |
961 | return 0; | |
962 | } | |
963 | ||
bd1a5c84 MH |
964 | static int __trace_add_event_call(struct ftrace_event_call *call) |
965 | { | |
966 | struct dentry *d_events; | |
967 | int ret; | |
6d723736 | 968 | |
bd1a5c84 MH |
969 | if (!call->name) |
970 | return -EINVAL; | |
701970b3 | 971 | |
bd1a5c84 MH |
972 | if (call->raw_init) { |
973 | ret = call->raw_init(call); | |
974 | if (ret < 0) { | |
975 | if (ret != -ENOSYS) | |
976 | pr_warning("Could not initialize trace " | |
977 | "events/%s\n", call->name); | |
978 | return ret; | |
979 | } | |
980 | } | |
701970b3 | 981 | |
bd1a5c84 MH |
982 | d_events = event_trace_events_dir(); |
983 | if (!d_events) | |
984 | return -ENOENT; | |
985 | ||
588bebb7 | 986 | ret = event_create_dir(call, d_events, &ftrace_event_id_fops, |
bd1a5c84 MH |
987 | &ftrace_enable_fops, &ftrace_event_filter_fops, |
988 | &ftrace_event_format_fops); | |
88f70d75 MH |
989 | if (!ret) |
990 | list_add(&call->list, &ftrace_events); | |
991 | ||
588bebb7 | 992 | return ret; |
bd1a5c84 MH |
993 | } |
994 | ||
995 | /* Add an additional event_call dynamically */ | |
996 | int trace_add_event_call(struct ftrace_event_call *call) | |
997 | { | |
998 | int ret; | |
999 | mutex_lock(&event_mutex); | |
1000 | ret = __trace_add_event_call(call); | |
1001 | mutex_unlock(&event_mutex); | |
1002 | return ret; | |
1003 | } | |
701970b3 | 1004 | |
a2ca5e03 FW |
1005 | static void remove_subsystem_dir(const char *name) |
1006 | { | |
1007 | struct event_subsystem *system; | |
1008 | ||
1009 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1010 | return; | |
1011 | ||
1012 | list_for_each_entry(system, &event_subsystems, list) { | |
1013 | if (strcmp(system->name, name) == 0) { | |
1014 | if (!--system->nr_events) { | |
1015 | struct event_filter *filter = system->filter; | |
1016 | ||
1017 | debugfs_remove_recursive(system->entry); | |
1018 | list_del(&system->list); | |
1019 | if (filter) { | |
1020 | kfree(filter->filter_string); | |
1021 | kfree(filter); | |
1022 | } | |
1023 | kfree(system->name); | |
1024 | kfree(system); | |
1025 | } | |
1026 | break; | |
1027 | } | |
1028 | } | |
1029 | } | |
1030 | ||
4fead8e4 MH |
1031 | /* |
1032 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1033 | */ | |
bd1a5c84 MH |
1034 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1035 | { | |
1036 | ftrace_event_enable_disable(call, 0); | |
1037 | if (call->event) | |
1038 | __unregister_ftrace_event(call->event); | |
1039 | debugfs_remove_recursive(call->dir); | |
1040 | list_del(&call->list); | |
1041 | trace_destroy_fields(call); | |
1042 | destroy_preds(call); | |
1043 | remove_subsystem_dir(call->system); | |
1044 | } | |
1045 | ||
1046 | /* Remove an event_call */ | |
1047 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1048 | { | |
1049 | mutex_lock(&event_mutex); | |
4fead8e4 | 1050 | down_write(&trace_event_mutex); |
bd1a5c84 | 1051 | __trace_remove_event_call(call); |
4fead8e4 | 1052 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1053 | mutex_unlock(&event_mutex); |
1054 | } | |
1055 | ||
1056 | #define for_each_event(event, start, end) \ | |
1057 | for (event = start; \ | |
1058 | (unsigned long)event < (unsigned long)end; \ | |
1059 | event++) | |
1060 | ||
1061 | #ifdef CONFIG_MODULES | |
1062 | ||
1063 | static LIST_HEAD(ftrace_module_file_list); | |
1064 | ||
1065 | /* | |
1066 | * Modules must own their file_operations to keep up with | |
1067 | * reference counting. | |
1068 | */ | |
1069 | struct ftrace_module_file_ops { | |
1070 | struct list_head list; | |
1071 | struct module *mod; | |
1072 | struct file_operations id; | |
1073 | struct file_operations enable; | |
1074 | struct file_operations format; | |
1075 | struct file_operations filter; | |
1076 | }; | |
1077 | ||
701970b3 SR |
1078 | static struct ftrace_module_file_ops * |
1079 | trace_create_file_ops(struct module *mod) | |
1080 | { | |
1081 | struct ftrace_module_file_ops *file_ops; | |
1082 | ||
1083 | /* | |
1084 | * This is a bit of a PITA. To allow for correct reference | |
1085 | * counting, modules must "own" their file_operations. | |
1086 | * To do this, we allocate the file operations that will be | |
1087 | * used in the event directory. | |
1088 | */ | |
1089 | ||
1090 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1091 | if (!file_ops) | |
1092 | return NULL; | |
1093 | ||
1094 | file_ops->mod = mod; | |
1095 | ||
1096 | file_ops->id = ftrace_event_id_fops; | |
1097 | file_ops->id.owner = mod; | |
1098 | ||
1099 | file_ops->enable = ftrace_enable_fops; | |
1100 | file_ops->enable.owner = mod; | |
1101 | ||
1102 | file_ops->filter = ftrace_event_filter_fops; | |
1103 | file_ops->filter.owner = mod; | |
1104 | ||
1105 | file_ops->format = ftrace_event_format_fops; | |
1106 | file_ops->format.owner = mod; | |
1107 | ||
1108 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1109 | ||
1110 | return file_ops; | |
1111 | } | |
1112 | ||
6d723736 SR |
1113 | static void trace_module_add_events(struct module *mod) |
1114 | { | |
701970b3 | 1115 | struct ftrace_module_file_ops *file_ops = NULL; |
6d723736 SR |
1116 | struct ftrace_event_call *call, *start, *end; |
1117 | struct dentry *d_events; | |
f744bd57 | 1118 | int ret; |
6d723736 SR |
1119 | |
1120 | start = mod->trace_events; | |
1121 | end = mod->trace_events + mod->num_trace_events; | |
1122 | ||
1123 | if (start == end) | |
1124 | return; | |
1125 | ||
1126 | d_events = event_trace_events_dir(); | |
1127 | if (!d_events) | |
1128 | return; | |
1129 | ||
1130 | for_each_event(call, start, end) { | |
1131 | /* The linker may leave blanks */ | |
1132 | if (!call->name) | |
1133 | continue; | |
f744bd57 | 1134 | if (call->raw_init) { |
bd1a5c84 | 1135 | ret = call->raw_init(call); |
f744bd57 JB |
1136 | if (ret < 0) { |
1137 | if (ret != -ENOSYS) | |
1138 | pr_warning("Could not initialize trace " | |
1139 | "point events/%s\n", call->name); | |
1140 | continue; | |
1141 | } | |
1142 | } | |
701970b3 SR |
1143 | /* |
1144 | * This module has events, create file ops for this module | |
1145 | * if not already done. | |
1146 | */ | |
1147 | if (!file_ops) { | |
1148 | file_ops = trace_create_file_ops(mod); | |
1149 | if (!file_ops) | |
1150 | return; | |
1151 | } | |
6d723736 | 1152 | call->mod = mod; |
88f70d75 MH |
1153 | ret = event_create_dir(call, d_events, |
1154 | &file_ops->id, &file_ops->enable, | |
1155 | &file_ops->filter, &file_ops->format); | |
1156 | if (!ret) | |
1157 | list_add(&call->list, &ftrace_events); | |
6d723736 SR |
1158 | } |
1159 | } | |
1160 | ||
1161 | static void trace_module_remove_events(struct module *mod) | |
1162 | { | |
701970b3 | 1163 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1164 | struct ftrace_event_call *call, *p; |
9456f0fa | 1165 | bool found = false; |
6d723736 | 1166 | |
110bf2b7 | 1167 | down_write(&trace_event_mutex); |
6d723736 SR |
1168 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1169 | if (call->mod == mod) { | |
9456f0fa | 1170 | found = true; |
bd1a5c84 | 1171 | __trace_remove_event_call(call); |
6d723736 SR |
1172 | } |
1173 | } | |
701970b3 SR |
1174 | |
1175 | /* Now free the file_operations */ | |
1176 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1177 | if (file_ops->mod == mod) | |
1178 | break; | |
1179 | } | |
1180 | if (&file_ops->list != &ftrace_module_file_list) { | |
1181 | list_del(&file_ops->list); | |
1182 | kfree(file_ops); | |
1183 | } | |
9456f0fa SR |
1184 | |
1185 | /* | |
1186 | * It is safest to reset the ring buffer if the module being unloaded | |
1187 | * registered any events. | |
1188 | */ | |
1189 | if (found) | |
1190 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1191 | up_write(&trace_event_mutex); |
6d723736 SR |
1192 | } |
1193 | ||
61f919a1 SR |
1194 | static int trace_module_notify(struct notifier_block *self, |
1195 | unsigned long val, void *data) | |
6d723736 SR |
1196 | { |
1197 | struct module *mod = data; | |
1198 | ||
1199 | mutex_lock(&event_mutex); | |
1200 | switch (val) { | |
1201 | case MODULE_STATE_COMING: | |
1202 | trace_module_add_events(mod); | |
1203 | break; | |
1204 | case MODULE_STATE_GOING: | |
1205 | trace_module_remove_events(mod); | |
1206 | break; | |
1207 | } | |
1208 | mutex_unlock(&event_mutex); | |
fd994989 | 1209 | |
1473e441 SR |
1210 | return 0; |
1211 | } | |
61f919a1 SR |
1212 | #else |
1213 | static int trace_module_notify(struct notifier_block *self, | |
1214 | unsigned long val, void *data) | |
1215 | { | |
1216 | return 0; | |
1217 | } | |
1218 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1219 | |
ec827c7e | 1220 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1221 | .notifier_call = trace_module_notify, |
1222 | .priority = 0, | |
1223 | }; | |
1224 | ||
a59fd602 SR |
1225 | extern struct ftrace_event_call __start_ftrace_events[]; |
1226 | extern struct ftrace_event_call __stop_ftrace_events[]; | |
1227 | ||
020e5f85 LZ |
1228 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1229 | ||
1230 | static __init int setup_trace_event(char *str) | |
1231 | { | |
1232 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1233 | ring_buffer_expanded = 1; | |
1234 | tracing_selftest_disabled = 1; | |
1235 | ||
1236 | return 1; | |
1237 | } | |
1238 | __setup("trace_event=", setup_trace_event); | |
1239 | ||
b77e38aa SR |
1240 | static __init int event_trace_init(void) |
1241 | { | |
a59fd602 | 1242 | struct ftrace_event_call *call; |
b77e38aa SR |
1243 | struct dentry *d_tracer; |
1244 | struct dentry *entry; | |
1473e441 | 1245 | struct dentry *d_events; |
6d723736 | 1246 | int ret; |
020e5f85 LZ |
1247 | char *buf = bootup_event_buf; |
1248 | char *token; | |
b77e38aa SR |
1249 | |
1250 | d_tracer = tracing_init_dentry(); | |
1251 | if (!d_tracer) | |
1252 | return 0; | |
1253 | ||
2314c4ae SR |
1254 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
1255 | (void *)&show_event_seq_ops, | |
1256 | &ftrace_avail_fops); | |
1257 | if (!entry) | |
1258 | pr_warning("Could not create debugfs " | |
1259 | "'available_events' entry\n"); | |
1260 | ||
b77e38aa SR |
1261 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
1262 | (void *)&show_set_event_seq_ops, | |
1263 | &ftrace_set_event_fops); | |
1264 | if (!entry) | |
1265 | pr_warning("Could not create debugfs " | |
1266 | "'set_event' entry\n"); | |
1267 | ||
1473e441 SR |
1268 | d_events = event_trace_events_dir(); |
1269 | if (!d_events) | |
1270 | return 0; | |
1271 | ||
d1b182a8 SR |
1272 | /* ring buffer internal formats */ |
1273 | trace_create_file("header_page", 0444, d_events, | |
1274 | ring_buffer_print_page_header, | |
1275 | &ftrace_show_header_fops); | |
1276 | ||
1277 | trace_create_file("header_event", 0444, d_events, | |
1278 | ring_buffer_print_entry_header, | |
1279 | &ftrace_show_header_fops); | |
1280 | ||
8ae79a13 | 1281 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1282 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1283 | |
6d723736 | 1284 | for_each_event(call, __start_ftrace_events, __stop_ftrace_events) { |
1473e441 SR |
1285 | /* The linker may leave blanks */ |
1286 | if (!call->name) | |
1287 | continue; | |
f744bd57 | 1288 | if (call->raw_init) { |
bd1a5c84 | 1289 | ret = call->raw_init(call); |
f744bd57 JB |
1290 | if (ret < 0) { |
1291 | if (ret != -ENOSYS) | |
1292 | pr_warning("Could not initialize trace " | |
1293 | "point events/%s\n", call->name); | |
1294 | continue; | |
1295 | } | |
1296 | } | |
88f70d75 MH |
1297 | ret = event_create_dir(call, d_events, &ftrace_event_id_fops, |
1298 | &ftrace_enable_fops, | |
1299 | &ftrace_event_filter_fops, | |
1300 | &ftrace_event_format_fops); | |
1301 | if (!ret) | |
1302 | list_add(&call->list, &ftrace_events); | |
1473e441 SR |
1303 | } |
1304 | ||
020e5f85 LZ |
1305 | while (true) { |
1306 | token = strsep(&buf, ","); | |
1307 | ||
1308 | if (!token) | |
1309 | break; | |
1310 | if (!*token) | |
1311 | continue; | |
1312 | ||
1313 | ret = ftrace_set_clr_event(token, 1); | |
1314 | if (ret) | |
1315 | pr_warning("Failed to enable trace event: %s\n", token); | |
1316 | } | |
1317 | ||
6d723736 | 1318 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1319 | if (ret) |
6d723736 SR |
1320 | pr_warning("Failed to register trace events module notifier\n"); |
1321 | ||
b77e38aa SR |
1322 | return 0; |
1323 | } | |
1324 | fs_initcall(event_trace_init); | |
e6187007 SR |
1325 | |
1326 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1327 | ||
1328 | static DEFINE_SPINLOCK(test_spinlock); | |
1329 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1330 | static DEFINE_MUTEX(test_mutex); | |
1331 | ||
1332 | static __init void test_work(struct work_struct *dummy) | |
1333 | { | |
1334 | spin_lock(&test_spinlock); | |
1335 | spin_lock_irq(&test_spinlock_irq); | |
1336 | udelay(1); | |
1337 | spin_unlock_irq(&test_spinlock_irq); | |
1338 | spin_unlock(&test_spinlock); | |
1339 | ||
1340 | mutex_lock(&test_mutex); | |
1341 | msleep(1); | |
1342 | mutex_unlock(&test_mutex); | |
1343 | } | |
1344 | ||
1345 | static __init int event_test_thread(void *unused) | |
1346 | { | |
1347 | void *test_malloc; | |
1348 | ||
1349 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1350 | if (!test_malloc) | |
1351 | pr_info("failed to kmalloc\n"); | |
1352 | ||
1353 | schedule_on_each_cpu(test_work); | |
1354 | ||
1355 | kfree(test_malloc); | |
1356 | ||
1357 | set_current_state(TASK_INTERRUPTIBLE); | |
1358 | while (!kthread_should_stop()) | |
1359 | schedule(); | |
1360 | ||
1361 | return 0; | |
1362 | } | |
1363 | ||
1364 | /* | |
1365 | * Do various things that may trigger events. | |
1366 | */ | |
1367 | static __init void event_test_stuff(void) | |
1368 | { | |
1369 | struct task_struct *test_thread; | |
1370 | ||
1371 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1372 | msleep(1); | |
1373 | kthread_stop(test_thread); | |
1374 | } | |
1375 | ||
1376 | /* | |
1377 | * For every trace event defined, we will test each trace point separately, | |
1378 | * and then by groups, and finally all trace points. | |
1379 | */ | |
9ea21c1e | 1380 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1381 | { |
1382 | struct ftrace_event_call *call; | |
1383 | struct event_subsystem *system; | |
e6187007 SR |
1384 | int ret; |
1385 | ||
1386 | pr_info("Running tests on trace events:\n"); | |
1387 | ||
1388 | list_for_each_entry(call, &ftrace_events, list) { | |
1389 | ||
1390 | /* Only test those that have a regfunc */ | |
1391 | if (!call->regfunc) | |
1392 | continue; | |
1393 | ||
1f5a6b45 SR |
1394 | /* |
1395 | * Testing syscall events here is pretty useless, but | |
1396 | * we still do it if configured. But this is time consuming. | |
1397 | * What we really need is a user thread to perform the | |
1398 | * syscalls as we test. | |
1399 | */ | |
1400 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
1401 | if (call->system && | |
1402 | strcmp(call->system, "syscalls") == 0) | |
1403 | continue; | |
1404 | #endif | |
1405 | ||
e6187007 SR |
1406 | pr_info("Testing event %s: ", call->name); |
1407 | ||
1408 | /* | |
1409 | * If an event is already enabled, someone is using | |
1410 | * it and the self test should not be on. | |
1411 | */ | |
1412 | if (call->enabled) { | |
1413 | pr_warning("Enabled event during self test!\n"); | |
1414 | WARN_ON_ONCE(1); | |
1415 | continue; | |
1416 | } | |
1417 | ||
0e907c99 | 1418 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1419 | event_test_stuff(); |
0e907c99 | 1420 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1421 | |
1422 | pr_cont("OK\n"); | |
1423 | } | |
1424 | ||
1425 | /* Now test at the sub system level */ | |
1426 | ||
1427 | pr_info("Running tests on trace event systems:\n"); | |
1428 | ||
1429 | list_for_each_entry(system, &event_subsystems, list) { | |
1430 | ||
1431 | /* the ftrace system is special, skip it */ | |
1432 | if (strcmp(system->name, "ftrace") == 0) | |
1433 | continue; | |
1434 | ||
1435 | pr_info("Testing event system %s: ", system->name); | |
1436 | ||
8f31bfe5 | 1437 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1438 | if (WARN_ON_ONCE(ret)) { |
1439 | pr_warning("error enabling system %s\n", | |
1440 | system->name); | |
1441 | continue; | |
1442 | } | |
1443 | ||
1444 | event_test_stuff(); | |
1445 | ||
8f31bfe5 | 1446 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
e6187007 SR |
1447 | if (WARN_ON_ONCE(ret)) |
1448 | pr_warning("error disabling system %s\n", | |
1449 | system->name); | |
1450 | ||
1451 | pr_cont("OK\n"); | |
1452 | } | |
1453 | ||
1454 | /* Test with all events enabled */ | |
1455 | ||
1456 | pr_info("Running tests on all trace events:\n"); | |
1457 | pr_info("Testing all events: "); | |
1458 | ||
8f31bfe5 | 1459 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1460 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1461 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1462 | return; |
e6187007 SR |
1463 | } |
1464 | ||
1465 | event_test_stuff(); | |
1466 | ||
1467 | /* reset sysname */ | |
8f31bfe5 | 1468 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1469 | if (WARN_ON_ONCE(ret)) { |
1470 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1471 | return; |
e6187007 SR |
1472 | } |
1473 | ||
1474 | pr_cont("OK\n"); | |
9ea21c1e SR |
1475 | } |
1476 | ||
1477 | #ifdef CONFIG_FUNCTION_TRACER | |
1478 | ||
245b2e70 | 1479 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
1480 | |
1481 | static void | |
1482 | function_test_events_call(unsigned long ip, unsigned long parent_ip) | |
1483 | { | |
1484 | struct ring_buffer_event *event; | |
e77405ad | 1485 | struct ring_buffer *buffer; |
9ea21c1e SR |
1486 | struct ftrace_entry *entry; |
1487 | unsigned long flags; | |
1488 | long disabled; | |
1489 | int resched; | |
1490 | int cpu; | |
1491 | int pc; | |
1492 | ||
1493 | pc = preempt_count(); | |
1494 | resched = ftrace_preempt_disable(); | |
1495 | cpu = raw_smp_processor_id(); | |
245b2e70 | 1496 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1497 | |
1498 | if (disabled != 1) | |
1499 | goto out; | |
1500 | ||
1501 | local_save_flags(flags); | |
1502 | ||
e77405ad SR |
1503 | event = trace_current_buffer_lock_reserve(&buffer, |
1504 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1505 | flags, pc); |
1506 | if (!event) | |
1507 | goto out; | |
1508 | entry = ring_buffer_event_data(event); | |
1509 | entry->ip = ip; | |
1510 | entry->parent_ip = parent_ip; | |
1511 | ||
e77405ad | 1512 | trace_nowake_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1513 | |
1514 | out: | |
245b2e70 | 1515 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1516 | ftrace_preempt_enable(resched); |
1517 | } | |
1518 | ||
1519 | static struct ftrace_ops trace_ops __initdata = | |
1520 | { | |
1521 | .func = function_test_events_call, | |
1522 | }; | |
1523 | ||
1524 | static __init void event_trace_self_test_with_function(void) | |
1525 | { | |
1526 | register_ftrace_function(&trace_ops); | |
1527 | pr_info("Running tests again, along with the function tracer\n"); | |
1528 | event_trace_self_tests(); | |
1529 | unregister_ftrace_function(&trace_ops); | |
1530 | } | |
1531 | #else | |
1532 | static __init void event_trace_self_test_with_function(void) | |
1533 | { | |
1534 | } | |
1535 | #endif | |
1536 | ||
1537 | static __init int event_trace_self_tests_init(void) | |
1538 | { | |
020e5f85 LZ |
1539 | if (!tracing_selftest_disabled) { |
1540 | event_trace_self_tests(); | |
1541 | event_trace_self_test_with_function(); | |
1542 | } | |
e6187007 SR |
1543 | |
1544 | return 0; | |
1545 | } | |
1546 | ||
28d20e2d | 1547 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1548 | |
1549 | #endif |