]>
Commit | Line | Data |
---|---|---|
bcea3f96 | 1 | // SPDX-License-Identifier: GPL-2.0 |
85f2b082 TZ |
2 | /* |
3 | * trace_events_trigger - trace event triggers | |
4 | * | |
85f2b082 TZ |
5 | * Copyright (C) 2013 Tom Zanussi <tom.zanussi@linux.intel.com> |
6 | */ | |
7 | ||
17911ff3 | 8 | #include <linux/security.h> |
85f2b082 TZ |
9 | #include <linux/module.h> |
10 | #include <linux/ctype.h> | |
11 | #include <linux/mutex.h> | |
12 | #include <linux/slab.h> | |
b2d09103 | 13 | #include <linux/rculist.h> |
85f2b082 TZ |
14 | |
15 | #include "trace.h" | |
16 | ||
17 | static LIST_HEAD(trigger_commands); | |
18 | static DEFINE_MUTEX(trigger_cmd_mutex); | |
19 | ||
ab4bf008 | 20 | void trigger_data_free(struct event_trigger_data *data) |
2a2df321 | 21 | { |
bac5fb97 TZ |
22 | if (data->cmd_ops->set_filter) |
23 | data->cmd_ops->set_filter(NULL, data, NULL); | |
24 | ||
e0a568dc SRV |
25 | /* make sure current triggers exit before free */ |
26 | tracepoint_synchronize_unregister(); | |
27 | ||
2a2df321 TZ |
28 | kfree(data); |
29 | } | |
30 | ||
85f2b082 TZ |
31 | /** |
32 | * event_triggers_call - Call triggers associated with a trace event | |
7f1d2f82 | 33 | * @file: The trace_event_file associated with the event |
bac5fb97 | 34 | * @rec: The trace entry for the event, NULL for unconditional invocation |
85f2b082 TZ |
35 | * |
36 | * For each trigger associated with an event, invoke the trigger | |
bac5fb97 TZ |
37 | * function registered with the associated trigger command. If rec is |
38 | * non-NULL, it means that the trigger requires further processing and | |
39 | * shouldn't be unconditionally invoked. If rec is non-NULL and the | |
40 | * trigger has a filter associated with it, rec will checked against | |
41 | * the filter and if the record matches the trigger will be invoked. | |
42 | * If the trigger is a 'post_trigger', meaning it shouldn't be invoked | |
43 | * in any case until the current event is written, the trigger | |
44 | * function isn't invoked but the bit associated with the deferred | |
45 | * trigger is set in the return value. | |
46 | * | |
47 | * Returns an enum event_trigger_type value containing a set bit for | |
48 | * any trigger that should be deferred, ETT_NONE if nothing to defer. | |
85f2b082 TZ |
49 | * |
50 | * Called from tracepoint handlers (with rcu_read_lock_sched() held). | |
51 | * | |
52 | * Return: an enum event_trigger_type value containing a set bit for | |
53 | * any trigger that should be deferred, ETT_NONE if nothing to defer. | |
54 | */ | |
bac5fb97 | 55 | enum event_trigger_type |
b47e3302 SRV |
56 | event_triggers_call(struct trace_event_file *file, |
57 | struct trace_buffer *buffer, void *rec, | |
1ac4f51c | 58 | struct ring_buffer_event *event) |
85f2b082 TZ |
59 | { |
60 | struct event_trigger_data *data; | |
bac5fb97 | 61 | enum event_trigger_type tt = ETT_NONE; |
d8a30f20 | 62 | struct event_filter *filter; |
85f2b082 TZ |
63 | |
64 | if (list_empty(&file->triggers)) | |
bac5fb97 | 65 | return tt; |
85f2b082 | 66 | |
bac5fb97 | 67 | list_for_each_entry_rcu(data, &file->triggers, list) { |
104f2810 TZ |
68 | if (data->paused) |
69 | continue; | |
bac5fb97 | 70 | if (!rec) { |
b47e3302 | 71 | data->ops->func(data, buffer, rec, event); |
bac5fb97 TZ |
72 | continue; |
73 | } | |
561a4fe8 | 74 | filter = rcu_dereference_sched(data->filter); |
d8a30f20 | 75 | if (filter && !filter_match_preds(filter, rec)) |
bac5fb97 | 76 | continue; |
353206f5 | 77 | if (event_command_post_trigger(data->cmd_ops)) { |
bac5fb97 TZ |
78 | tt |= data->cmd_ops->trigger_type; |
79 | continue; | |
80 | } | |
b47e3302 | 81 | data->ops->func(data, buffer, rec, event); |
bac5fb97 TZ |
82 | } |
83 | return tt; | |
85f2b082 TZ |
84 | } |
85 | EXPORT_SYMBOL_GPL(event_triggers_call); | |
86 | ||
bac5fb97 TZ |
87 | /** |
88 | * event_triggers_post_call - Call 'post_triggers' for a trace event | |
7f1d2f82 | 89 | * @file: The trace_event_file associated with the event |
bac5fb97 TZ |
90 | * @tt: enum event_trigger_type containing a set bit for each trigger to invoke |
91 | * | |
92 | * For each trigger associated with an event, invoke the trigger | |
93 | * function registered with the associated trigger command, if the | |
94 | * corresponding bit is set in the tt enum passed into this function. | |
95 | * See @event_triggers_call for details on how those bits are set. | |
96 | * | |
97 | * Called from tracepoint handlers (with rcu_read_lock_sched() held). | |
98 | */ | |
99 | void | |
7f1d2f82 | 100 | event_triggers_post_call(struct trace_event_file *file, |
c94e45bc | 101 | enum event_trigger_type tt) |
bac5fb97 TZ |
102 | { |
103 | struct event_trigger_data *data; | |
104 | ||
105 | list_for_each_entry_rcu(data, &file->triggers, list) { | |
104f2810 TZ |
106 | if (data->paused) |
107 | continue; | |
bac5fb97 | 108 | if (data->cmd_ops->trigger_type & tt) |
b47e3302 | 109 | data->ops->func(data, NULL, NULL, NULL); |
bac5fb97 TZ |
110 | } |
111 | } | |
112 | EXPORT_SYMBOL_GPL(event_triggers_post_call); | |
113 | ||
dd97b954 SRRH |
114 | #define SHOW_AVAILABLE_TRIGGERS (void *)(1UL) |
115 | ||
85f2b082 TZ |
116 | static void *trigger_next(struct seq_file *m, void *t, loff_t *pos) |
117 | { | |
7f1d2f82 | 118 | struct trace_event_file *event_file = event_file_data(m->private); |
85f2b082 | 119 | |
6722b23e VA |
120 | if (t == SHOW_AVAILABLE_TRIGGERS) { |
121 | (*pos)++; | |
dd97b954 | 122 | return NULL; |
6722b23e | 123 | } |
85f2b082 TZ |
124 | return seq_list_next(t, &event_file->triggers, pos); |
125 | } | |
126 | ||
127 | static void *trigger_start(struct seq_file *m, loff_t *pos) | |
128 | { | |
7f1d2f82 | 129 | struct trace_event_file *event_file; |
85f2b082 TZ |
130 | |
131 | /* ->stop() is called even if ->start() fails */ | |
132 | mutex_lock(&event_mutex); | |
133 | event_file = event_file_data(m->private); | |
134 | if (unlikely(!event_file)) | |
135 | return ERR_PTR(-ENODEV); | |
136 | ||
dd97b954 SRRH |
137 | if (list_empty(&event_file->triggers)) |
138 | return *pos == 0 ? SHOW_AVAILABLE_TRIGGERS : NULL; | |
139 | ||
85f2b082 TZ |
140 | return seq_list_start(&event_file->triggers, *pos); |
141 | } | |
142 | ||
143 | static void trigger_stop(struct seq_file *m, void *t) | |
144 | { | |
145 | mutex_unlock(&event_mutex); | |
146 | } | |
147 | ||
148 | static int trigger_show(struct seq_file *m, void *v) | |
149 | { | |
150 | struct event_trigger_data *data; | |
dd97b954 SRRH |
151 | struct event_command *p; |
152 | ||
153 | if (v == SHOW_AVAILABLE_TRIGGERS) { | |
154 | seq_puts(m, "# Available triggers:\n"); | |
155 | seq_putc(m, '#'); | |
156 | mutex_lock(&trigger_cmd_mutex); | |
157 | list_for_each_entry_reverse(p, &trigger_commands, list) | |
158 | seq_printf(m, " %s", p->name); | |
159 | seq_putc(m, '\n'); | |
160 | mutex_unlock(&trigger_cmd_mutex); | |
161 | return 0; | |
162 | } | |
85f2b082 TZ |
163 | |
164 | data = list_entry(v, struct event_trigger_data, list); | |
165 | data->ops->print(m, data->ops, data); | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | static const struct seq_operations event_triggers_seq_ops = { | |
171 | .start = trigger_start, | |
172 | .next = trigger_next, | |
173 | .stop = trigger_stop, | |
174 | .show = trigger_show, | |
175 | }; | |
176 | ||
177 | static int event_trigger_regex_open(struct inode *inode, struct file *file) | |
178 | { | |
17911ff3 SRV |
179 | int ret; |
180 | ||
181 | ret = security_locked_down(LOCKDOWN_TRACEFS); | |
182 | if (ret) | |
183 | return ret; | |
85f2b082 TZ |
184 | |
185 | mutex_lock(&event_mutex); | |
186 | ||
187 | if (unlikely(!event_file_data(file))) { | |
188 | mutex_unlock(&event_mutex); | |
189 | return -ENODEV; | |
190 | } | |
191 | ||
a88e1cfb TZ |
192 | if ((file->f_mode & FMODE_WRITE) && |
193 | (file->f_flags & O_TRUNC)) { | |
194 | struct trace_event_file *event_file; | |
195 | struct event_command *p; | |
196 | ||
197 | event_file = event_file_data(file); | |
198 | ||
199 | list_for_each_entry(p, &trigger_commands, list) { | |
200 | if (p->unreg_all) | |
201 | p->unreg_all(event_file); | |
202 | } | |
203 | } | |
204 | ||
85f2b082 TZ |
205 | if (file->f_mode & FMODE_READ) { |
206 | ret = seq_open(file, &event_triggers_seq_ops); | |
207 | if (!ret) { | |
208 | struct seq_file *m = file->private_data; | |
209 | m->private = file; | |
210 | } | |
211 | } | |
212 | ||
213 | mutex_unlock(&event_mutex); | |
214 | ||
215 | return ret; | |
216 | } | |
217 | ||
81a59555 | 218 | int trigger_process_regex(struct trace_event_file *file, char *buff) |
85f2b082 | 219 | { |
6784bead | 220 | char *command, *next; |
85f2b082 TZ |
221 | struct event_command *p; |
222 | int ret = -EINVAL; | |
223 | ||
6784bead | 224 | next = buff = skip_spaces(buff); |
85f2b082 | 225 | command = strsep(&next, ": \t"); |
6784bead MH |
226 | if (next) { |
227 | next = skip_spaces(next); | |
228 | if (!*next) | |
229 | next = NULL; | |
230 | } | |
85f2b082 TZ |
231 | command = (command[0] != '!') ? command : command + 1; |
232 | ||
233 | mutex_lock(&trigger_cmd_mutex); | |
234 | list_for_each_entry(p, &trigger_commands, list) { | |
235 | if (strcmp(p->name, command) == 0) { | |
236 | ret = p->func(p, file, buff, command, next); | |
237 | goto out_unlock; | |
238 | } | |
239 | } | |
240 | out_unlock: | |
241 | mutex_unlock(&trigger_cmd_mutex); | |
242 | ||
243 | return ret; | |
244 | } | |
245 | ||
246 | static ssize_t event_trigger_regex_write(struct file *file, | |
247 | const char __user *ubuf, | |
248 | size_t cnt, loff_t *ppos) | |
249 | { | |
7f1d2f82 | 250 | struct trace_event_file *event_file; |
85f2b082 TZ |
251 | ssize_t ret; |
252 | char *buf; | |
253 | ||
254 | if (!cnt) | |
255 | return 0; | |
256 | ||
257 | if (cnt >= PAGE_SIZE) | |
258 | return -EINVAL; | |
259 | ||
70f6cbb6 AV |
260 | buf = memdup_user_nul(ubuf, cnt); |
261 | if (IS_ERR(buf)) | |
262 | return PTR_ERR(buf); | |
85f2b082 | 263 | |
85f2b082 TZ |
264 | strim(buf); |
265 | ||
266 | mutex_lock(&event_mutex); | |
267 | event_file = event_file_data(file); | |
268 | if (unlikely(!event_file)) { | |
269 | mutex_unlock(&event_mutex); | |
70f6cbb6 | 270 | kfree(buf); |
85f2b082 TZ |
271 | return -ENODEV; |
272 | } | |
273 | ret = trigger_process_regex(event_file, buf); | |
274 | mutex_unlock(&event_mutex); | |
275 | ||
70f6cbb6 | 276 | kfree(buf); |
85f2b082 TZ |
277 | if (ret < 0) |
278 | goto out; | |
279 | ||
280 | *ppos += cnt; | |
281 | ret = cnt; | |
282 | out: | |
283 | return ret; | |
284 | } | |
285 | ||
286 | static int event_trigger_regex_release(struct inode *inode, struct file *file) | |
287 | { | |
288 | mutex_lock(&event_mutex); | |
289 | ||
290 | if (file->f_mode & FMODE_READ) | |
291 | seq_release(inode, file); | |
292 | ||
293 | mutex_unlock(&event_mutex); | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
298 | static ssize_t | |
299 | event_trigger_write(struct file *filp, const char __user *ubuf, | |
300 | size_t cnt, loff_t *ppos) | |
301 | { | |
302 | return event_trigger_regex_write(filp, ubuf, cnt, ppos); | |
303 | } | |
304 | ||
305 | static int | |
306 | event_trigger_open(struct inode *inode, struct file *filp) | |
307 | { | |
17911ff3 | 308 | /* Checks for tracefs lockdown */ |
85f2b082 TZ |
309 | return event_trigger_regex_open(inode, filp); |
310 | } | |
311 | ||
312 | static int | |
313 | event_trigger_release(struct inode *inode, struct file *file) | |
314 | { | |
315 | return event_trigger_regex_release(inode, file); | |
316 | } | |
317 | ||
318 | const struct file_operations event_trigger_fops = { | |
319 | .open = event_trigger_open, | |
320 | .read = seq_read, | |
321 | .write = event_trigger_write, | |
098c879e | 322 | .llseek = tracing_lseek, |
85f2b082 TZ |
323 | .release = event_trigger_release, |
324 | }; | |
325 | ||
2a2df321 TZ |
326 | /* |
327 | * Currently we only register event commands from __init, so mark this | |
328 | * __init too. | |
329 | */ | |
ab4bf008 | 330 | __init int register_event_command(struct event_command *cmd) |
2a2df321 TZ |
331 | { |
332 | struct event_command *p; | |
333 | int ret = 0; | |
334 | ||
335 | mutex_lock(&trigger_cmd_mutex); | |
336 | list_for_each_entry(p, &trigger_commands, list) { | |
337 | if (strcmp(cmd->name, p->name) == 0) { | |
338 | ret = -EBUSY; | |
339 | goto out_unlock; | |
340 | } | |
341 | } | |
342 | list_add(&cmd->list, &trigger_commands); | |
343 | out_unlock: | |
344 | mutex_unlock(&trigger_cmd_mutex); | |
345 | ||
346 | return ret; | |
347 | } | |
348 | ||
349 | /* | |
350 | * Currently we only unregister event commands from __init, so mark | |
351 | * this __init too. | |
352 | */ | |
d0bad49b | 353 | __init int unregister_event_command(struct event_command *cmd) |
2a2df321 TZ |
354 | { |
355 | struct event_command *p, *n; | |
356 | int ret = -ENODEV; | |
357 | ||
358 | mutex_lock(&trigger_cmd_mutex); | |
359 | list_for_each_entry_safe(p, n, &trigger_commands, list) { | |
360 | if (strcmp(cmd->name, p->name) == 0) { | |
361 | ret = 0; | |
362 | list_del_init(&p->list); | |
363 | goto out_unlock; | |
364 | } | |
365 | } | |
366 | out_unlock: | |
367 | mutex_unlock(&trigger_cmd_mutex); | |
368 | ||
369 | return ret; | |
370 | } | |
371 | ||
372 | /** | |
373 | * event_trigger_print - Generic event_trigger_ops @print implementation | |
374 | * @name: The name of the event trigger | |
375 | * @m: The seq_file being printed to | |
376 | * @data: Trigger-specific data | |
377 | * @filter_str: filter_str to print, if present | |
378 | * | |
379 | * Common implementation for event triggers to print themselves. | |
380 | * | |
381 | * Usually wrapped by a function that simply sets the @name of the | |
382 | * trigger command and then invokes this. | |
383 | * | |
384 | * Return: 0 on success, errno otherwise | |
385 | */ | |
386 | static int | |
387 | event_trigger_print(const char *name, struct seq_file *m, | |
388 | void *data, char *filter_str) | |
389 | { | |
390 | long count = (long)data; | |
391 | ||
fa6f0cc7 | 392 | seq_puts(m, name); |
2a2df321 TZ |
393 | |
394 | if (count == -1) | |
395 | seq_puts(m, ":unlimited"); | |
396 | else | |
397 | seq_printf(m, ":count=%ld", count); | |
398 | ||
399 | if (filter_str) | |
400 | seq_printf(m, " if %s\n", filter_str); | |
401 | else | |
1177e436 | 402 | seq_putc(m, '\n'); |
2a2df321 TZ |
403 | |
404 | return 0; | |
405 | } | |
406 | ||
407 | /** | |
408 | * event_trigger_init - Generic event_trigger_ops @init implementation | |
409 | * @ops: The trigger ops associated with the trigger | |
410 | * @data: Trigger-specific data | |
411 | * | |
412 | * Common implementation of event trigger initialization. | |
413 | * | |
414 | * Usually used directly as the @init method in event trigger | |
415 | * implementations. | |
416 | * | |
417 | * Return: 0 on success, errno otherwise | |
418 | */ | |
ab4bf008 TZ |
419 | int event_trigger_init(struct event_trigger_ops *ops, |
420 | struct event_trigger_data *data) | |
2a2df321 TZ |
421 | { |
422 | data->ref++; | |
423 | return 0; | |
424 | } | |
425 | ||
426 | /** | |
427 | * event_trigger_free - Generic event_trigger_ops @free implementation | |
428 | * @ops: The trigger ops associated with the trigger | |
429 | * @data: Trigger-specific data | |
430 | * | |
431 | * Common implementation of event trigger de-initialization. | |
432 | * | |
433 | * Usually used directly as the @free method in event trigger | |
434 | * implementations. | |
435 | */ | |
436 | static void | |
437 | event_trigger_free(struct event_trigger_ops *ops, | |
438 | struct event_trigger_data *data) | |
439 | { | |
440 | if (WARN_ON_ONCE(data->ref <= 0)) | |
441 | return; | |
442 | ||
443 | data->ref--; | |
444 | if (!data->ref) | |
445 | trigger_data_free(data); | |
446 | } | |
447 | ||
ab4bf008 TZ |
448 | int trace_event_trigger_enable_disable(struct trace_event_file *file, |
449 | int trigger_enable) | |
85f2b082 TZ |
450 | { |
451 | int ret = 0; | |
452 | ||
453 | if (trigger_enable) { | |
454 | if (atomic_inc_return(&file->tm_ref) > 1) | |
455 | return ret; | |
5d6ad960 | 456 | set_bit(EVENT_FILE_FL_TRIGGER_MODE_BIT, &file->flags); |
85f2b082 TZ |
457 | ret = trace_event_enable_disable(file, 1, 1); |
458 | } else { | |
459 | if (atomic_dec_return(&file->tm_ref) > 0) | |
460 | return ret; | |
5d6ad960 | 461 | clear_bit(EVENT_FILE_FL_TRIGGER_MODE_BIT, &file->flags); |
85f2b082 TZ |
462 | ret = trace_event_enable_disable(file, 0, 1); |
463 | } | |
464 | ||
465 | return ret; | |
466 | } | |
467 | ||
468 | /** | |
469 | * clear_event_triggers - Clear all triggers associated with a trace array | |
470 | * @tr: The trace array to clear | |
471 | * | |
472 | * For each trigger, the triggering event has its tm_ref decremented | |
473 | * via trace_event_trigger_enable_disable(), and any associated event | |
474 | * (in the case of enable/disable_event triggers) will have its sm_ref | |
475 | * decremented via free()->trace_event_enable_disable(). That | |
476 | * combination effectively reverses the soft-mode/trigger state added | |
477 | * by trigger registration. | |
478 | * | |
479 | * Must be called with event_mutex held. | |
480 | */ | |
481 | void | |
482 | clear_event_triggers(struct trace_array *tr) | |
483 | { | |
7f1d2f82 | 484 | struct trace_event_file *file; |
85f2b082 TZ |
485 | |
486 | list_for_each_entry(file, &tr->events, list) { | |
86b389ff SRV |
487 | struct event_trigger_data *data, *n; |
488 | list_for_each_entry_safe(data, n, &file->triggers, list) { | |
85f2b082 | 489 | trace_event_trigger_enable_disable(file, 0); |
86b389ff | 490 | list_del_rcu(&data->list); |
85f2b082 TZ |
491 | if (data->ops->free) |
492 | data->ops->free(data->ops, data); | |
493 | } | |
494 | } | |
495 | } | |
496 | ||
bac5fb97 TZ |
497 | /** |
498 | * update_cond_flag - Set or reset the TRIGGER_COND bit | |
7f1d2f82 | 499 | * @file: The trace_event_file associated with the event |
bac5fb97 TZ |
500 | * |
501 | * If an event has triggers and any of those triggers has a filter or | |
502 | * a post_trigger, trigger invocation needs to be deferred until after | |
503 | * the current event has logged its data, and the event should have | |
504 | * its TRIGGER_COND bit set, otherwise the TRIGGER_COND bit should be | |
505 | * cleared. | |
506 | */ | |
ab4bf008 | 507 | void update_cond_flag(struct trace_event_file *file) |
bac5fb97 TZ |
508 | { |
509 | struct event_trigger_data *data; | |
510 | bool set_cond = false; | |
511 | ||
3b42a4c8 MH |
512 | lockdep_assert_held(&event_mutex); |
513 | ||
514 | list_for_each_entry(data, &file->triggers, list) { | |
353206f5 SRRH |
515 | if (data->filter || event_command_post_trigger(data->cmd_ops) || |
516 | event_command_needs_rec(data->cmd_ops)) { | |
bac5fb97 TZ |
517 | set_cond = true; |
518 | break; | |
519 | } | |
520 | } | |
521 | ||
522 | if (set_cond) | |
5d6ad960 | 523 | set_bit(EVENT_FILE_FL_TRIGGER_COND_BIT, &file->flags); |
bac5fb97 | 524 | else |
5d6ad960 | 525 | clear_bit(EVENT_FILE_FL_TRIGGER_COND_BIT, &file->flags); |
bac5fb97 TZ |
526 | } |
527 | ||
2a2df321 TZ |
528 | /** |
529 | * register_trigger - Generic event_command @reg implementation | |
530 | * @glob: The raw string used to register the trigger | |
531 | * @ops: The trigger ops associated with the trigger | |
532 | * @data: Trigger-specific data to associate with the trigger | |
7f1d2f82 | 533 | * @file: The trace_event_file associated with the event |
2a2df321 TZ |
534 | * |
535 | * Common implementation for event trigger registration. | |
536 | * | |
537 | * Usually used directly as the @reg method in event command | |
538 | * implementations. | |
539 | * | |
540 | * Return: 0 on success, errno otherwise | |
541 | */ | |
542 | static int register_trigger(char *glob, struct event_trigger_ops *ops, | |
543 | struct event_trigger_data *data, | |
7f1d2f82 | 544 | struct trace_event_file *file) |
2a2df321 TZ |
545 | { |
546 | struct event_trigger_data *test; | |
547 | int ret = 0; | |
548 | ||
3b42a4c8 MH |
549 | lockdep_assert_held(&event_mutex); |
550 | ||
551 | list_for_each_entry(test, &file->triggers, list) { | |
2a2df321 TZ |
552 | if (test->cmd_ops->trigger_type == data->cmd_ops->trigger_type) { |
553 | ret = -EEXIST; | |
554 | goto out; | |
555 | } | |
556 | } | |
557 | ||
558 | if (data->ops->init) { | |
559 | ret = data->ops->init(data->ops, data); | |
560 | if (ret < 0) | |
561 | goto out; | |
562 | } | |
563 | ||
564 | list_add_rcu(&data->list, &file->triggers); | |
565 | ret++; | |
566 | ||
4e4a4d75 | 567 | update_cond_flag(file); |
2a2df321 TZ |
568 | if (trace_event_trigger_enable_disable(file, 1) < 0) { |
569 | list_del_rcu(&data->list); | |
4e4a4d75 | 570 | update_cond_flag(file); |
2a2df321 TZ |
571 | ret--; |
572 | } | |
573 | out: | |
574 | return ret; | |
575 | } | |
576 | ||
577 | /** | |
578 | * unregister_trigger - Generic event_command @unreg implementation | |
579 | * @glob: The raw string used to register the trigger | |
580 | * @ops: The trigger ops associated with the trigger | |
581 | * @test: Trigger-specific data used to find the trigger to remove | |
7f1d2f82 | 582 | * @file: The trace_event_file associated with the event |
2a2df321 TZ |
583 | * |
584 | * Common implementation for event trigger unregistration. | |
585 | * | |
586 | * Usually used directly as the @unreg method in event command | |
587 | * implementations. | |
588 | */ | |
f6b7425c SRV |
589 | static void unregister_trigger(char *glob, struct event_trigger_ops *ops, |
590 | struct event_trigger_data *test, | |
591 | struct trace_event_file *file) | |
2a2df321 TZ |
592 | { |
593 | struct event_trigger_data *data; | |
594 | bool unregistered = false; | |
595 | ||
3b42a4c8 MH |
596 | lockdep_assert_held(&event_mutex); |
597 | ||
598 | list_for_each_entry(data, &file->triggers, list) { | |
2a2df321 TZ |
599 | if (data->cmd_ops->trigger_type == test->cmd_ops->trigger_type) { |
600 | unregistered = true; | |
601 | list_del_rcu(&data->list); | |
602 | trace_event_trigger_enable_disable(file, 0); | |
4e4a4d75 | 603 | update_cond_flag(file); |
2a2df321 TZ |
604 | break; |
605 | } | |
606 | } | |
607 | ||
608 | if (unregistered && data->ops->free) | |
609 | data->ops->free(data->ops, data); | |
610 | } | |
611 | ||
612 | /** | |
613 | * event_trigger_callback - Generic event_command @func implementation | |
614 | * @cmd_ops: The command ops, used for trigger registration | |
7f1d2f82 | 615 | * @file: The trace_event_file associated with the event |
2a2df321 TZ |
616 | * @glob: The raw string used to register the trigger |
617 | * @cmd: The cmd portion of the string used to register the trigger | |
618 | * @param: The params portion of the string used to register the trigger | |
619 | * | |
620 | * Common implementation for event command parsing and trigger | |
621 | * instantiation. | |
622 | * | |
623 | * Usually used directly as the @func method in event command | |
624 | * implementations. | |
625 | * | |
626 | * Return: 0 on success, errno otherwise | |
627 | */ | |
628 | static int | |
629 | event_trigger_callback(struct event_command *cmd_ops, | |
7f1d2f82 | 630 | struct trace_event_file *file, |
2a2df321 TZ |
631 | char *glob, char *cmd, char *param) |
632 | { | |
633 | struct event_trigger_data *trigger_data; | |
634 | struct event_trigger_ops *trigger_ops; | |
635 | char *trigger = NULL; | |
636 | char *number; | |
637 | int ret; | |
638 | ||
639 | /* separate the trigger from the filter (t:n [if filter]) */ | |
6784bead | 640 | if (param && isdigit(param[0])) { |
2a2df321 | 641 | trigger = strsep(¶m, " \t"); |
6784bead MH |
642 | if (param) { |
643 | param = skip_spaces(param); | |
644 | if (!*param) | |
645 | param = NULL; | |
646 | } | |
647 | } | |
2a2df321 TZ |
648 | |
649 | trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger); | |
650 | ||
651 | ret = -ENOMEM; | |
652 | trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL); | |
653 | if (!trigger_data) | |
654 | goto out; | |
655 | ||
656 | trigger_data->count = -1; | |
657 | trigger_data->ops = trigger_ops; | |
658 | trigger_data->cmd_ops = cmd_ops; | |
2824f503 | 659 | trigger_data->private_data = file; |
2a2df321 | 660 | INIT_LIST_HEAD(&trigger_data->list); |
db1388b4 | 661 | INIT_LIST_HEAD(&trigger_data->named_list); |
2a2df321 TZ |
662 | |
663 | if (glob[0] == '!') { | |
664 | cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file); | |
665 | kfree(trigger_data); | |
666 | ret = 0; | |
667 | goto out; | |
668 | } | |
669 | ||
670 | if (trigger) { | |
671 | number = strsep(&trigger, ":"); | |
672 | ||
673 | ret = -EINVAL; | |
674 | if (!strlen(number)) | |
675 | goto out_free; | |
676 | ||
677 | /* | |
678 | * We use the callback data field (which is a pointer) | |
679 | * as our counter. | |
680 | */ | |
681 | ret = kstrtoul(number, 0, &trigger_data->count); | |
682 | if (ret) | |
683 | goto out_free; | |
684 | } | |
685 | ||
686 | if (!param) /* if param is non-empty, it's supposed to be a filter */ | |
687 | goto out_reg; | |
688 | ||
689 | if (!cmd_ops->set_filter) | |
690 | goto out_reg; | |
691 | ||
692 | ret = cmd_ops->set_filter(param, trigger_data, file); | |
693 | if (ret < 0) | |
694 | goto out_free; | |
695 | ||
696 | out_reg: | |
1863c387 SRV |
697 | /* Up the trigger_data count to make sure reg doesn't free it on failure */ |
698 | event_trigger_init(trigger_ops, trigger_data); | |
2a2df321 TZ |
699 | ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file); |
700 | /* | |
701 | * The above returns on success the # of functions enabled, | |
702 | * but if it didn't find any functions it returns zero. | |
703 | * Consider no functions a failure too. | |
704 | */ | |
705 | if (!ret) { | |
1863c387 | 706 | cmd_ops->unreg(glob, trigger_ops, trigger_data, file); |
2a2df321 | 707 | ret = -ENOENT; |
1863c387 SRV |
708 | } else if (ret > 0) |
709 | ret = 0; | |
710 | ||
711 | /* Down the counter of trigger_data or free it if not used anymore */ | |
712 | event_trigger_free(trigger_ops, trigger_data); | |
2a2df321 TZ |
713 | out: |
714 | return ret; | |
715 | ||
716 | out_free: | |
bac5fb97 TZ |
717 | if (cmd_ops->set_filter) |
718 | cmd_ops->set_filter(NULL, trigger_data, NULL); | |
2a2df321 TZ |
719 | kfree(trigger_data); |
720 | goto out; | |
721 | } | |
722 | ||
bac5fb97 TZ |
723 | /** |
724 | * set_trigger_filter - Generic event_command @set_filter implementation | |
725 | * @filter_str: The filter string for the trigger, NULL to remove filter | |
726 | * @trigger_data: Trigger-specific data | |
7f1d2f82 | 727 | * @file: The trace_event_file associated with the event |
bac5fb97 TZ |
728 | * |
729 | * Common implementation for event command filter parsing and filter | |
730 | * instantiation. | |
731 | * | |
732 | * Usually used directly as the @set_filter method in event command | |
733 | * implementations. | |
734 | * | |
735 | * Also used to remove a filter (if filter_str = NULL). | |
736 | * | |
737 | * Return: 0 on success, errno otherwise | |
738 | */ | |
ab4bf008 TZ |
739 | int set_trigger_filter(char *filter_str, |
740 | struct event_trigger_data *trigger_data, | |
741 | struct trace_event_file *file) | |
bac5fb97 TZ |
742 | { |
743 | struct event_trigger_data *data = trigger_data; | |
744 | struct event_filter *filter = NULL, *tmp; | |
745 | int ret = -EINVAL; | |
746 | char *s; | |
747 | ||
748 | if (!filter_str) /* clear the current filter */ | |
749 | goto assign; | |
750 | ||
751 | s = strsep(&filter_str, " \t"); | |
752 | ||
753 | if (!strlen(s) || strcmp(s, "if") != 0) | |
754 | goto out; | |
755 | ||
756 | if (!filter_str) | |
757 | goto out; | |
758 | ||
759 | /* The filter is for the 'trigger' event, not the triggered event */ | |
1e144d73 SRV |
760 | ret = create_event_filter(file->tr, file->event_call, |
761 | filter_str, false, &filter); | |
3cec638b SRV |
762 | /* |
763 | * If create_event_filter() fails, filter still needs to be freed. | |
764 | * Which the calling code will do with data->filter. | |
765 | */ | |
bac5fb97 | 766 | assign: |
d8a30f20 | 767 | tmp = rcu_access_pointer(data->filter); |
bac5fb97 TZ |
768 | |
769 | rcu_assign_pointer(data->filter, filter); | |
770 | ||
771 | if (tmp) { | |
772 | /* Make sure the call is done with the filter */ | |
e0a568dc | 773 | tracepoint_synchronize_unregister(); |
bac5fb97 TZ |
774 | free_event_filter(tmp); |
775 | } | |
776 | ||
777 | kfree(data->filter_str); | |
778 | data->filter_str = NULL; | |
779 | ||
780 | if (filter_str) { | |
781 | data->filter_str = kstrdup(filter_str, GFP_KERNEL); | |
782 | if (!data->filter_str) { | |
d8a30f20 | 783 | free_event_filter(rcu_access_pointer(data->filter)); |
bac5fb97 TZ |
784 | data->filter = NULL; |
785 | ret = -ENOMEM; | |
786 | } | |
787 | } | |
788 | out: | |
789 | return ret; | |
790 | } | |
791 | ||
db1388b4 TZ |
792 | static LIST_HEAD(named_triggers); |
793 | ||
794 | /** | |
795 | * find_named_trigger - Find the common named trigger associated with @name | |
796 | * @name: The name of the set of named triggers to find the common data for | |
797 | * | |
798 | * Named triggers are sets of triggers that share a common set of | |
799 | * trigger data. The first named trigger registered with a given name | |
800 | * owns the common trigger data that the others subsequently | |
801 | * registered with the same name will reference. This function | |
802 | * returns the common trigger data associated with that first | |
803 | * registered instance. | |
804 | * | |
805 | * Return: the common trigger data for the given named trigger on | |
806 | * success, NULL otherwise. | |
807 | */ | |
808 | struct event_trigger_data *find_named_trigger(const char *name) | |
809 | { | |
810 | struct event_trigger_data *data; | |
811 | ||
812 | if (!name) | |
813 | return NULL; | |
814 | ||
815 | list_for_each_entry(data, &named_triggers, named_list) { | |
816 | if (data->named_data) | |
817 | continue; | |
818 | if (strcmp(data->name, name) == 0) | |
819 | return data; | |
820 | } | |
821 | ||
822 | return NULL; | |
823 | } | |
824 | ||
825 | /** | |
826 | * is_named_trigger - determine if a given trigger is a named trigger | |
827 | * @test: The trigger data to test | |
828 | * | |
829 | * Return: true if 'test' is a named trigger, false otherwise. | |
830 | */ | |
831 | bool is_named_trigger(struct event_trigger_data *test) | |
832 | { | |
833 | struct event_trigger_data *data; | |
834 | ||
835 | list_for_each_entry(data, &named_triggers, named_list) { | |
836 | if (test == data) | |
837 | return true; | |
838 | } | |
839 | ||
840 | return false; | |
841 | } | |
842 | ||
843 | /** | |
844 | * save_named_trigger - save the trigger in the named trigger list | |
845 | * @name: The name of the named trigger set | |
846 | * @data: The trigger data to save | |
847 | * | |
848 | * Return: 0 if successful, negative error otherwise. | |
849 | */ | |
850 | int save_named_trigger(const char *name, struct event_trigger_data *data) | |
851 | { | |
852 | data->name = kstrdup(name, GFP_KERNEL); | |
853 | if (!data->name) | |
854 | return -ENOMEM; | |
855 | ||
856 | list_add(&data->named_list, &named_triggers); | |
857 | ||
858 | return 0; | |
859 | } | |
860 | ||
861 | /** | |
862 | * del_named_trigger - delete a trigger from the named trigger list | |
863 | * @data: The trigger data to delete | |
864 | */ | |
865 | void del_named_trigger(struct event_trigger_data *data) | |
866 | { | |
867 | kfree(data->name); | |
868 | data->name = NULL; | |
869 | ||
870 | list_del(&data->named_list); | |
871 | } | |
872 | ||
873 | static void __pause_named_trigger(struct event_trigger_data *data, bool pause) | |
874 | { | |
875 | struct event_trigger_data *test; | |
876 | ||
877 | list_for_each_entry(test, &named_triggers, named_list) { | |
878 | if (strcmp(test->name, data->name) == 0) { | |
879 | if (pause) { | |
880 | test->paused_tmp = test->paused; | |
881 | test->paused = true; | |
882 | } else { | |
883 | test->paused = test->paused_tmp; | |
884 | } | |
885 | } | |
886 | } | |
887 | } | |
888 | ||
889 | /** | |
890 | * pause_named_trigger - Pause all named triggers with the same name | |
891 | * @data: The trigger data of a named trigger to pause | |
892 | * | |
893 | * Pauses a named trigger along with all other triggers having the | |
894 | * same name. Because named triggers share a common set of data, | |
895 | * pausing only one is meaningless, so pausing one named trigger needs | |
896 | * to pause all triggers with the same name. | |
897 | */ | |
898 | void pause_named_trigger(struct event_trigger_data *data) | |
899 | { | |
900 | __pause_named_trigger(data, true); | |
901 | } | |
902 | ||
903 | /** | |
904 | * unpause_named_trigger - Un-pause all named triggers with the same name | |
905 | * @data: The trigger data of a named trigger to unpause | |
906 | * | |
907 | * Un-pauses a named trigger along with all other triggers having the | |
908 | * same name. Because named triggers share a common set of data, | |
909 | * unpausing only one is meaningless, so unpausing one named trigger | |
910 | * needs to unpause all triggers with the same name. | |
911 | */ | |
912 | void unpause_named_trigger(struct event_trigger_data *data) | |
913 | { | |
914 | __pause_named_trigger(data, false); | |
915 | } | |
916 | ||
917 | /** | |
918 | * set_named_trigger_data - Associate common named trigger data | |
099dcc18 QH |
919 | * @data: The trigger data to associate |
920 | * @named_data: The common named trigger to be associated | |
db1388b4 TZ |
921 | * |
922 | * Named triggers are sets of triggers that share a common set of | |
923 | * trigger data. The first named trigger registered with a given name | |
924 | * owns the common trigger data that the others subsequently | |
925 | * registered with the same name will reference. This function | |
926 | * associates the common trigger data from the first trigger with the | |
927 | * given trigger. | |
928 | */ | |
929 | void set_named_trigger_data(struct event_trigger_data *data, | |
930 | struct event_trigger_data *named_data) | |
931 | { | |
932 | data->named_data = named_data; | |
933 | } | |
934 | ||
067fe038 TZ |
935 | struct event_trigger_data * |
936 | get_named_trigger_data(struct event_trigger_data *data) | |
937 | { | |
938 | return data->named_data; | |
939 | } | |
940 | ||
2a2df321 | 941 | static void |
b47e3302 SRV |
942 | traceon_trigger(struct event_trigger_data *data, |
943 | struct trace_buffer *buffer, void *rec, | |
1ac4f51c | 944 | struct ring_buffer_event *event) |
2a2df321 TZ |
945 | { |
946 | if (tracing_is_on()) | |
947 | return; | |
948 | ||
949 | tracing_on(); | |
950 | } | |
951 | ||
952 | static void | |
b47e3302 SRV |
953 | traceon_count_trigger(struct event_trigger_data *data, |
954 | struct trace_buffer *buffer, void *rec, | |
1ac4f51c | 955 | struct ring_buffer_event *event) |
2a2df321 | 956 | { |
e8dc6371 SRRH |
957 | if (tracing_is_on()) |
958 | return; | |
959 | ||
2a2df321 TZ |
960 | if (!data->count) |
961 | return; | |
962 | ||
963 | if (data->count != -1) | |
964 | (data->count)--; | |
965 | ||
e8dc6371 | 966 | tracing_on(); |
2a2df321 TZ |
967 | } |
968 | ||
969 | static void | |
b47e3302 SRV |
970 | traceoff_trigger(struct event_trigger_data *data, |
971 | struct trace_buffer *buffer, void *rec, | |
1ac4f51c | 972 | struct ring_buffer_event *event) |
2a2df321 TZ |
973 | { |
974 | if (!tracing_is_on()) | |
975 | return; | |
976 | ||
977 | tracing_off(); | |
978 | } | |
979 | ||
980 | static void | |
b47e3302 SRV |
981 | traceoff_count_trigger(struct event_trigger_data *data, |
982 | struct trace_buffer *buffer, void *rec, | |
1ac4f51c | 983 | struct ring_buffer_event *event) |
2a2df321 | 984 | { |
e8dc6371 SRRH |
985 | if (!tracing_is_on()) |
986 | return; | |
987 | ||
2a2df321 TZ |
988 | if (!data->count) |
989 | return; | |
990 | ||
991 | if (data->count != -1) | |
992 | (data->count)--; | |
993 | ||
e8dc6371 | 994 | tracing_off(); |
2a2df321 TZ |
995 | } |
996 | ||
997 | static int | |
998 | traceon_trigger_print(struct seq_file *m, struct event_trigger_ops *ops, | |
999 | struct event_trigger_data *data) | |
1000 | { | |
1001 | return event_trigger_print("traceon", m, (void *)data->count, | |
1002 | data->filter_str); | |
1003 | } | |
1004 | ||
1005 | static int | |
1006 | traceoff_trigger_print(struct seq_file *m, struct event_trigger_ops *ops, | |
1007 | struct event_trigger_data *data) | |
1008 | { | |
1009 | return event_trigger_print("traceoff", m, (void *)data->count, | |
1010 | data->filter_str); | |
1011 | } | |
1012 | ||
1013 | static struct event_trigger_ops traceon_trigger_ops = { | |
1014 | .func = traceon_trigger, | |
1015 | .print = traceon_trigger_print, | |
1016 | .init = event_trigger_init, | |
1017 | .free = event_trigger_free, | |
1018 | }; | |
1019 | ||
1020 | static struct event_trigger_ops traceon_count_trigger_ops = { | |
1021 | .func = traceon_count_trigger, | |
1022 | .print = traceon_trigger_print, | |
1023 | .init = event_trigger_init, | |
1024 | .free = event_trigger_free, | |
1025 | }; | |
1026 | ||
1027 | static struct event_trigger_ops traceoff_trigger_ops = { | |
1028 | .func = traceoff_trigger, | |
1029 | .print = traceoff_trigger_print, | |
1030 | .init = event_trigger_init, | |
1031 | .free = event_trigger_free, | |
1032 | }; | |
1033 | ||
1034 | static struct event_trigger_ops traceoff_count_trigger_ops = { | |
1035 | .func = traceoff_count_trigger, | |
1036 | .print = traceoff_trigger_print, | |
1037 | .init = event_trigger_init, | |
1038 | .free = event_trigger_free, | |
1039 | }; | |
1040 | ||
1041 | static struct event_trigger_ops * | |
1042 | onoff_get_trigger_ops(char *cmd, char *param) | |
1043 | { | |
1044 | struct event_trigger_ops *ops; | |
1045 | ||
1046 | /* we register both traceon and traceoff to this callback */ | |
1047 | if (strcmp(cmd, "traceon") == 0) | |
1048 | ops = param ? &traceon_count_trigger_ops : | |
1049 | &traceon_trigger_ops; | |
1050 | else | |
1051 | ops = param ? &traceoff_count_trigger_ops : | |
1052 | &traceoff_trigger_ops; | |
1053 | ||
1054 | return ops; | |
1055 | } | |
1056 | ||
1057 | static struct event_command trigger_traceon_cmd = { | |
1058 | .name = "traceon", | |
1059 | .trigger_type = ETT_TRACE_ONOFF, | |
1060 | .func = event_trigger_callback, | |
1061 | .reg = register_trigger, | |
1062 | .unreg = unregister_trigger, | |
1063 | .get_trigger_ops = onoff_get_trigger_ops, | |
bac5fb97 | 1064 | .set_filter = set_trigger_filter, |
2a2df321 TZ |
1065 | }; |
1066 | ||
1067 | static struct event_command trigger_traceoff_cmd = { | |
1068 | .name = "traceoff", | |
1069 | .trigger_type = ETT_TRACE_ONOFF, | |
a0d0c621 | 1070 | .flags = EVENT_CMD_FL_POST_TRIGGER, |
2a2df321 TZ |
1071 | .func = event_trigger_callback, |
1072 | .reg = register_trigger, | |
1073 | .unreg = unregister_trigger, | |
1074 | .get_trigger_ops = onoff_get_trigger_ops, | |
bac5fb97 | 1075 | .set_filter = set_trigger_filter, |
2a2df321 TZ |
1076 | }; |
1077 | ||
93e31ffb TZ |
1078 | #ifdef CONFIG_TRACER_SNAPSHOT |
1079 | static void | |
b47e3302 SRV |
1080 | snapshot_trigger(struct event_trigger_data *data, |
1081 | struct trace_buffer *buffer, void *rec, | |
1ac4f51c | 1082 | struct ring_buffer_event *event) |
93e31ffb | 1083 | { |
2824f503 SRV |
1084 | struct trace_event_file *file = data->private_data; |
1085 | ||
1086 | if (file) | |
1087 | tracing_snapshot_instance(file->tr); | |
1088 | else | |
1089 | tracing_snapshot(); | |
93e31ffb TZ |
1090 | } |
1091 | ||
1092 | static void | |
b47e3302 SRV |
1093 | snapshot_count_trigger(struct event_trigger_data *data, |
1094 | struct trace_buffer *buffer, void *rec, | |
1ac4f51c | 1095 | struct ring_buffer_event *event) |
93e31ffb TZ |
1096 | { |
1097 | if (!data->count) | |
1098 | return; | |
1099 | ||
1100 | if (data->count != -1) | |
1101 | (data->count)--; | |
1102 | ||
b47e3302 | 1103 | snapshot_trigger(data, buffer, rec, event); |
93e31ffb TZ |
1104 | } |
1105 | ||
1106 | static int | |
1107 | register_snapshot_trigger(char *glob, struct event_trigger_ops *ops, | |
1108 | struct event_trigger_data *data, | |
7f1d2f82 | 1109 | struct trace_event_file *file) |
93e31ffb | 1110 | { |
0bbe7f71 XY |
1111 | if (tracing_alloc_snapshot_instance(file->tr) != 0) |
1112 | return 0; | |
93e31ffb | 1113 | |
0bbe7f71 | 1114 | return register_trigger(glob, ops, data, file); |
93e31ffb TZ |
1115 | } |
1116 | ||
1117 | static int | |
1118 | snapshot_trigger_print(struct seq_file *m, struct event_trigger_ops *ops, | |
1119 | struct event_trigger_data *data) | |
1120 | { | |
1121 | return event_trigger_print("snapshot", m, (void *)data->count, | |
1122 | data->filter_str); | |
1123 | } | |
1124 | ||
1125 | static struct event_trigger_ops snapshot_trigger_ops = { | |
1126 | .func = snapshot_trigger, | |
1127 | .print = snapshot_trigger_print, | |
1128 | .init = event_trigger_init, | |
1129 | .free = event_trigger_free, | |
1130 | }; | |
1131 | ||
1132 | static struct event_trigger_ops snapshot_count_trigger_ops = { | |
1133 | .func = snapshot_count_trigger, | |
1134 | .print = snapshot_trigger_print, | |
1135 | .init = event_trigger_init, | |
1136 | .free = event_trigger_free, | |
1137 | }; | |
1138 | ||
1139 | static struct event_trigger_ops * | |
1140 | snapshot_get_trigger_ops(char *cmd, char *param) | |
1141 | { | |
1142 | return param ? &snapshot_count_trigger_ops : &snapshot_trigger_ops; | |
1143 | } | |
1144 | ||
1145 | static struct event_command trigger_snapshot_cmd = { | |
1146 | .name = "snapshot", | |
1147 | .trigger_type = ETT_SNAPSHOT, | |
1148 | .func = event_trigger_callback, | |
1149 | .reg = register_snapshot_trigger, | |
1150 | .unreg = unregister_trigger, | |
1151 | .get_trigger_ops = snapshot_get_trigger_ops, | |
bac5fb97 | 1152 | .set_filter = set_trigger_filter, |
93e31ffb TZ |
1153 | }; |
1154 | ||
1155 | static __init int register_trigger_snapshot_cmd(void) | |
1156 | { | |
1157 | int ret; | |
1158 | ||
1159 | ret = register_event_command(&trigger_snapshot_cmd); | |
1160 | WARN_ON(ret < 0); | |
1161 | ||
1162 | return ret; | |
1163 | } | |
1164 | #else | |
1165 | static __init int register_trigger_snapshot_cmd(void) { return 0; } | |
1166 | #endif /* CONFIG_TRACER_SNAPSHOT */ | |
1167 | ||
f21ecbb3 | 1168 | #ifdef CONFIG_STACKTRACE |
2ee5b92a SRV |
1169 | #ifdef CONFIG_UNWINDER_ORC |
1170 | /* Skip 2: | |
1171 | * event_triggers_post_call() | |
1172 | * trace_event_raw_event_xxx() | |
1173 | */ | |
1174 | # define STACK_SKIP 2 | |
1175 | #else | |
f21ecbb3 | 1176 | /* |
2ee5b92a | 1177 | * Skip 4: |
f21ecbb3 TZ |
1178 | * stacktrace_trigger() |
1179 | * event_triggers_post_call() | |
2ee5b92a | 1180 | * trace_event_buffer_commit() |
a7237765 | 1181 | * trace_event_raw_event_xxx() |
f21ecbb3 | 1182 | */ |
2ee5b92a SRV |
1183 | #define STACK_SKIP 4 |
1184 | #endif | |
f21ecbb3 TZ |
1185 | |
1186 | static void | |
b47e3302 SRV |
1187 | stacktrace_trigger(struct event_trigger_data *data, |
1188 | struct trace_buffer *buffer, void *rec, | |
1ac4f51c | 1189 | struct ring_buffer_event *event) |
f21ecbb3 TZ |
1190 | { |
1191 | trace_dump_stack(STACK_SKIP); | |
1192 | } | |
1193 | ||
1194 | static void | |
b47e3302 SRV |
1195 | stacktrace_count_trigger(struct event_trigger_data *data, |
1196 | struct trace_buffer *buffer, void *rec, | |
1ac4f51c | 1197 | struct ring_buffer_event *event) |
f21ecbb3 TZ |
1198 | { |
1199 | if (!data->count) | |
1200 | return; | |
1201 | ||
1202 | if (data->count != -1) | |
1203 | (data->count)--; | |
1204 | ||
b47e3302 | 1205 | stacktrace_trigger(data, buffer, rec, event); |
f21ecbb3 TZ |
1206 | } |
1207 | ||
1208 | static int | |
1209 | stacktrace_trigger_print(struct seq_file *m, struct event_trigger_ops *ops, | |
1210 | struct event_trigger_data *data) | |
1211 | { | |
1212 | return event_trigger_print("stacktrace", m, (void *)data->count, | |
1213 | data->filter_str); | |
1214 | } | |
1215 | ||
1216 | static struct event_trigger_ops stacktrace_trigger_ops = { | |
1217 | .func = stacktrace_trigger, | |
1218 | .print = stacktrace_trigger_print, | |
1219 | .init = event_trigger_init, | |
1220 | .free = event_trigger_free, | |
1221 | }; | |
1222 | ||
1223 | static struct event_trigger_ops stacktrace_count_trigger_ops = { | |
1224 | .func = stacktrace_count_trigger, | |
1225 | .print = stacktrace_trigger_print, | |
1226 | .init = event_trigger_init, | |
1227 | .free = event_trigger_free, | |
1228 | }; | |
1229 | ||
1230 | static struct event_trigger_ops * | |
1231 | stacktrace_get_trigger_ops(char *cmd, char *param) | |
1232 | { | |
1233 | return param ? &stacktrace_count_trigger_ops : &stacktrace_trigger_ops; | |
1234 | } | |
1235 | ||
1236 | static struct event_command trigger_stacktrace_cmd = { | |
1237 | .name = "stacktrace", | |
1238 | .trigger_type = ETT_STACKTRACE, | |
353206f5 | 1239 | .flags = EVENT_CMD_FL_POST_TRIGGER, |
f21ecbb3 TZ |
1240 | .func = event_trigger_callback, |
1241 | .reg = register_trigger, | |
1242 | .unreg = unregister_trigger, | |
1243 | .get_trigger_ops = stacktrace_get_trigger_ops, | |
bac5fb97 | 1244 | .set_filter = set_trigger_filter, |
f21ecbb3 TZ |
1245 | }; |
1246 | ||
1247 | static __init int register_trigger_stacktrace_cmd(void) | |
1248 | { | |
1249 | int ret; | |
1250 | ||
1251 | ret = register_event_command(&trigger_stacktrace_cmd); | |
1252 | WARN_ON(ret < 0); | |
1253 | ||
1254 | return ret; | |
1255 | } | |
1256 | #else | |
1257 | static __init int register_trigger_stacktrace_cmd(void) { return 0; } | |
1258 | #endif /* CONFIG_STACKTRACE */ | |
1259 | ||
2a2df321 TZ |
1260 | static __init void unregister_trigger_traceon_traceoff_cmds(void) |
1261 | { | |
1262 | unregister_event_command(&trigger_traceon_cmd); | |
1263 | unregister_event_command(&trigger_traceoff_cmd); | |
1264 | } | |
1265 | ||
7862ad18 | 1266 | static void |
b47e3302 SRV |
1267 | event_enable_trigger(struct event_trigger_data *data, |
1268 | struct trace_buffer *buffer, void *rec, | |
1ac4f51c | 1269 | struct ring_buffer_event *event) |
7862ad18 TZ |
1270 | { |
1271 | struct enable_trigger_data *enable_data = data->private_data; | |
1272 | ||
1273 | if (enable_data->enable) | |
5d6ad960 | 1274 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &enable_data->file->flags); |
7862ad18 | 1275 | else |
5d6ad960 | 1276 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &enable_data->file->flags); |
7862ad18 TZ |
1277 | } |
1278 | ||
1279 | static void | |
b47e3302 SRV |
1280 | event_enable_count_trigger(struct event_trigger_data *data, |
1281 | struct trace_buffer *buffer, void *rec, | |
1ac4f51c | 1282 | struct ring_buffer_event *event) |
7862ad18 TZ |
1283 | { |
1284 | struct enable_trigger_data *enable_data = data->private_data; | |
1285 | ||
1286 | if (!data->count) | |
1287 | return; | |
1288 | ||
1289 | /* Skip if the event is in a state we want to switch to */ | |
5d6ad960 | 1290 | if (enable_data->enable == !(enable_data->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
7862ad18 TZ |
1291 | return; |
1292 | ||
1293 | if (data->count != -1) | |
1294 | (data->count)--; | |
1295 | ||
b47e3302 | 1296 | event_enable_trigger(data, buffer, rec, event); |
7862ad18 TZ |
1297 | } |
1298 | ||
d0bad49b TZ |
1299 | int event_enable_trigger_print(struct seq_file *m, |
1300 | struct event_trigger_ops *ops, | |
1301 | struct event_trigger_data *data) | |
7862ad18 TZ |
1302 | { |
1303 | struct enable_trigger_data *enable_data = data->private_data; | |
1304 | ||
1305 | seq_printf(m, "%s:%s:%s", | |
d0bad49b TZ |
1306 | enable_data->hist ? |
1307 | (enable_data->enable ? ENABLE_HIST_STR : DISABLE_HIST_STR) : | |
1308 | (enable_data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR), | |
7862ad18 | 1309 | enable_data->file->event_call->class->system, |
687fcc4a | 1310 | trace_event_name(enable_data->file->event_call)); |
7862ad18 TZ |
1311 | |
1312 | if (data->count == -1) | |
1313 | seq_puts(m, ":unlimited"); | |
1314 | else | |
1315 | seq_printf(m, ":count=%ld", data->count); | |
1316 | ||
1317 | if (data->filter_str) | |
1318 | seq_printf(m, " if %s\n", data->filter_str); | |
1319 | else | |
1177e436 | 1320 | seq_putc(m, '\n'); |
7862ad18 TZ |
1321 | |
1322 | return 0; | |
1323 | } | |
1324 | ||
d0bad49b TZ |
1325 | void event_enable_trigger_free(struct event_trigger_ops *ops, |
1326 | struct event_trigger_data *data) | |
7862ad18 TZ |
1327 | { |
1328 | struct enable_trigger_data *enable_data = data->private_data; | |
1329 | ||
1330 | if (WARN_ON_ONCE(data->ref <= 0)) | |
1331 | return; | |
1332 | ||
1333 | data->ref--; | |
1334 | if (!data->ref) { | |
1335 | /* Remove the SOFT_MODE flag */ | |
1336 | trace_event_enable_disable(enable_data->file, 0, 1); | |
1337 | module_put(enable_data->file->event_call->mod); | |
1338 | trigger_data_free(data); | |
1339 | kfree(enable_data); | |
1340 | } | |
1341 | } | |
1342 | ||
1343 | static struct event_trigger_ops event_enable_trigger_ops = { | |
1344 | .func = event_enable_trigger, | |
1345 | .print = event_enable_trigger_print, | |
1346 | .init = event_trigger_init, | |
1347 | .free = event_enable_trigger_free, | |
1348 | }; | |
1349 | ||
1350 | static struct event_trigger_ops event_enable_count_trigger_ops = { | |
1351 | .func = event_enable_count_trigger, | |
1352 | .print = event_enable_trigger_print, | |
1353 | .init = event_trigger_init, | |
1354 | .free = event_enable_trigger_free, | |
1355 | }; | |
1356 | ||
1357 | static struct event_trigger_ops event_disable_trigger_ops = { | |
1358 | .func = event_enable_trigger, | |
1359 | .print = event_enable_trigger_print, | |
1360 | .init = event_trigger_init, | |
1361 | .free = event_enable_trigger_free, | |
1362 | }; | |
1363 | ||
1364 | static struct event_trigger_ops event_disable_count_trigger_ops = { | |
1365 | .func = event_enable_count_trigger, | |
1366 | .print = event_enable_trigger_print, | |
1367 | .init = event_trigger_init, | |
1368 | .free = event_enable_trigger_free, | |
1369 | }; | |
1370 | ||
d0bad49b TZ |
1371 | int event_enable_trigger_func(struct event_command *cmd_ops, |
1372 | struct trace_event_file *file, | |
1373 | char *glob, char *cmd, char *param) | |
7862ad18 | 1374 | { |
7f1d2f82 | 1375 | struct trace_event_file *event_enable_file; |
7862ad18 TZ |
1376 | struct enable_trigger_data *enable_data; |
1377 | struct event_trigger_data *trigger_data; | |
1378 | struct event_trigger_ops *trigger_ops; | |
1379 | struct trace_array *tr = file->tr; | |
1380 | const char *system; | |
1381 | const char *event; | |
d0bad49b | 1382 | bool hist = false; |
7862ad18 TZ |
1383 | char *trigger; |
1384 | char *number; | |
1385 | bool enable; | |
1386 | int ret; | |
1387 | ||
1388 | if (!param) | |
1389 | return -EINVAL; | |
1390 | ||
1391 | /* separate the trigger from the filter (s:e:n [if filter]) */ | |
1392 | trigger = strsep(¶m, " \t"); | |
1393 | if (!trigger) | |
1394 | return -EINVAL; | |
6784bead MH |
1395 | if (param) { |
1396 | param = skip_spaces(param); | |
1397 | if (!*param) | |
1398 | param = NULL; | |
1399 | } | |
7862ad18 TZ |
1400 | |
1401 | system = strsep(&trigger, ":"); | |
1402 | if (!trigger) | |
1403 | return -EINVAL; | |
1404 | ||
1405 | event = strsep(&trigger, ":"); | |
1406 | ||
1407 | ret = -EINVAL; | |
1408 | event_enable_file = find_event_file(tr, system, event); | |
1409 | if (!event_enable_file) | |
1410 | goto out; | |
1411 | ||
d0bad49b TZ |
1412 | #ifdef CONFIG_HIST_TRIGGERS |
1413 | hist = ((strcmp(cmd, ENABLE_HIST_STR) == 0) || | |
1414 | (strcmp(cmd, DISABLE_HIST_STR) == 0)); | |
7862ad18 | 1415 | |
d0bad49b TZ |
1416 | enable = ((strcmp(cmd, ENABLE_EVENT_STR) == 0) || |
1417 | (strcmp(cmd, ENABLE_HIST_STR) == 0)); | |
1418 | #else | |
1419 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
1420 | #endif | |
7862ad18 TZ |
1421 | trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger); |
1422 | ||
1423 | ret = -ENOMEM; | |
1424 | trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL); | |
1425 | if (!trigger_data) | |
1426 | goto out; | |
1427 | ||
1428 | enable_data = kzalloc(sizeof(*enable_data), GFP_KERNEL); | |
1429 | if (!enable_data) { | |
1430 | kfree(trigger_data); | |
1431 | goto out; | |
1432 | } | |
1433 | ||
1434 | trigger_data->count = -1; | |
1435 | trigger_data->ops = trigger_ops; | |
1436 | trigger_data->cmd_ops = cmd_ops; | |
1437 | INIT_LIST_HEAD(&trigger_data->list); | |
1438 | RCU_INIT_POINTER(trigger_data->filter, NULL); | |
1439 | ||
d0bad49b | 1440 | enable_data->hist = hist; |
7862ad18 TZ |
1441 | enable_data->enable = enable; |
1442 | enable_data->file = event_enable_file; | |
1443 | trigger_data->private_data = enable_data; | |
1444 | ||
1445 | if (glob[0] == '!') { | |
1446 | cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file); | |
1447 | kfree(trigger_data); | |
1448 | kfree(enable_data); | |
1449 | ret = 0; | |
1450 | goto out; | |
1451 | } | |
1452 | ||
15cc7864 SRV |
1453 | /* Up the trigger_data count to make sure nothing frees it on failure */ |
1454 | event_trigger_init(trigger_ops, trigger_data); | |
1455 | ||
7862ad18 TZ |
1456 | if (trigger) { |
1457 | number = strsep(&trigger, ":"); | |
1458 | ||
1459 | ret = -EINVAL; | |
1460 | if (!strlen(number)) | |
1461 | goto out_free; | |
1462 | ||
1463 | /* | |
1464 | * We use the callback data field (which is a pointer) | |
1465 | * as our counter. | |
1466 | */ | |
1467 | ret = kstrtoul(number, 0, &trigger_data->count); | |
1468 | if (ret) | |
1469 | goto out_free; | |
1470 | } | |
1471 | ||
1472 | if (!param) /* if param is non-empty, it's supposed to be a filter */ | |
1473 | goto out_reg; | |
1474 | ||
1475 | if (!cmd_ops->set_filter) | |
1476 | goto out_reg; | |
1477 | ||
1478 | ret = cmd_ops->set_filter(param, trigger_data, file); | |
1479 | if (ret < 0) | |
1480 | goto out_free; | |
1481 | ||
1482 | out_reg: | |
1483 | /* Don't let event modules unload while probe registered */ | |
1484 | ret = try_module_get(event_enable_file->event_call->mod); | |
1485 | if (!ret) { | |
1486 | ret = -EBUSY; | |
1487 | goto out_free; | |
1488 | } | |
1489 | ||
1490 | ret = trace_event_enable_disable(event_enable_file, 1, 1); | |
1491 | if (ret < 0) | |
1492 | goto out_put; | |
1493 | ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file); | |
1494 | /* | |
1495 | * The above returns on success the # of functions enabled, | |
1496 | * but if it didn't find any functions it returns zero. | |
1497 | * Consider no functions a failure too. | |
1498 | */ | |
1499 | if (!ret) { | |
1500 | ret = -ENOENT; | |
1501 | goto out_disable; | |
1502 | } else if (ret < 0) | |
1503 | goto out_disable; | |
1504 | /* Just return zero, not the number of enabled functions */ | |
1505 | ret = 0; | |
15cc7864 | 1506 | event_trigger_free(trigger_ops, trigger_data); |
7862ad18 TZ |
1507 | out: |
1508 | return ret; | |
1509 | ||
1510 | out_disable: | |
1511 | trace_event_enable_disable(event_enable_file, 0, 1); | |
1512 | out_put: | |
1513 | module_put(event_enable_file->event_call->mod); | |
1514 | out_free: | |
bac5fb97 TZ |
1515 | if (cmd_ops->set_filter) |
1516 | cmd_ops->set_filter(NULL, trigger_data, NULL); | |
15cc7864 | 1517 | event_trigger_free(trigger_ops, trigger_data); |
7862ad18 TZ |
1518 | kfree(enable_data); |
1519 | goto out; | |
1520 | } | |
1521 | ||
d0bad49b TZ |
1522 | int event_enable_register_trigger(char *glob, |
1523 | struct event_trigger_ops *ops, | |
1524 | struct event_trigger_data *data, | |
1525 | struct trace_event_file *file) | |
7862ad18 TZ |
1526 | { |
1527 | struct enable_trigger_data *enable_data = data->private_data; | |
1528 | struct enable_trigger_data *test_enable_data; | |
1529 | struct event_trigger_data *test; | |
1530 | int ret = 0; | |
1531 | ||
3b42a4c8 MH |
1532 | lockdep_assert_held(&event_mutex); |
1533 | ||
1534 | list_for_each_entry(test, &file->triggers, list) { | |
7862ad18 TZ |
1535 | test_enable_data = test->private_data; |
1536 | if (test_enable_data && | |
d0bad49b TZ |
1537 | (test->cmd_ops->trigger_type == |
1538 | data->cmd_ops->trigger_type) && | |
7862ad18 TZ |
1539 | (test_enable_data->file == enable_data->file)) { |
1540 | ret = -EEXIST; | |
1541 | goto out; | |
1542 | } | |
1543 | } | |
1544 | ||
1545 | if (data->ops->init) { | |
1546 | ret = data->ops->init(data->ops, data); | |
1547 | if (ret < 0) | |
1548 | goto out; | |
1549 | } | |
1550 | ||
1551 | list_add_rcu(&data->list, &file->triggers); | |
1552 | ret++; | |
1553 | ||
4e4a4d75 | 1554 | update_cond_flag(file); |
7862ad18 TZ |
1555 | if (trace_event_trigger_enable_disable(file, 1) < 0) { |
1556 | list_del_rcu(&data->list); | |
4e4a4d75 | 1557 | update_cond_flag(file); |
7862ad18 TZ |
1558 | ret--; |
1559 | } | |
1560 | out: | |
1561 | return ret; | |
1562 | } | |
1563 | ||
d0bad49b TZ |
1564 | void event_enable_unregister_trigger(char *glob, |
1565 | struct event_trigger_ops *ops, | |
1566 | struct event_trigger_data *test, | |
1567 | struct trace_event_file *file) | |
7862ad18 TZ |
1568 | { |
1569 | struct enable_trigger_data *test_enable_data = test->private_data; | |
1570 | struct enable_trigger_data *enable_data; | |
1571 | struct event_trigger_data *data; | |
1572 | bool unregistered = false; | |
1573 | ||
3b42a4c8 MH |
1574 | lockdep_assert_held(&event_mutex); |
1575 | ||
1576 | list_for_each_entry(data, &file->triggers, list) { | |
7862ad18 TZ |
1577 | enable_data = data->private_data; |
1578 | if (enable_data && | |
d0bad49b TZ |
1579 | (data->cmd_ops->trigger_type == |
1580 | test->cmd_ops->trigger_type) && | |
7862ad18 TZ |
1581 | (enable_data->file == test_enable_data->file)) { |
1582 | unregistered = true; | |
1583 | list_del_rcu(&data->list); | |
1584 | trace_event_trigger_enable_disable(file, 0); | |
4e4a4d75 | 1585 | update_cond_flag(file); |
7862ad18 TZ |
1586 | break; |
1587 | } | |
1588 | } | |
1589 | ||
1590 | if (unregistered && data->ops->free) | |
1591 | data->ops->free(data->ops, data); | |
1592 | } | |
1593 | ||
1594 | static struct event_trigger_ops * | |
1595 | event_enable_get_trigger_ops(char *cmd, char *param) | |
1596 | { | |
1597 | struct event_trigger_ops *ops; | |
1598 | bool enable; | |
1599 | ||
d0bad49b TZ |
1600 | #ifdef CONFIG_HIST_TRIGGERS |
1601 | enable = ((strcmp(cmd, ENABLE_EVENT_STR) == 0) || | |
1602 | (strcmp(cmd, ENABLE_HIST_STR) == 0)); | |
1603 | #else | |
7862ad18 | 1604 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; |
d0bad49b | 1605 | #endif |
7862ad18 TZ |
1606 | if (enable) |
1607 | ops = param ? &event_enable_count_trigger_ops : | |
1608 | &event_enable_trigger_ops; | |
1609 | else | |
1610 | ops = param ? &event_disable_count_trigger_ops : | |
1611 | &event_disable_trigger_ops; | |
1612 | ||
1613 | return ops; | |
1614 | } | |
1615 | ||
1616 | static struct event_command trigger_enable_cmd = { | |
1617 | .name = ENABLE_EVENT_STR, | |
1618 | .trigger_type = ETT_EVENT_ENABLE, | |
1619 | .func = event_enable_trigger_func, | |
1620 | .reg = event_enable_register_trigger, | |
1621 | .unreg = event_enable_unregister_trigger, | |
1622 | .get_trigger_ops = event_enable_get_trigger_ops, | |
bac5fb97 | 1623 | .set_filter = set_trigger_filter, |
7862ad18 TZ |
1624 | }; |
1625 | ||
1626 | static struct event_command trigger_disable_cmd = { | |
1627 | .name = DISABLE_EVENT_STR, | |
1628 | .trigger_type = ETT_EVENT_ENABLE, | |
1629 | .func = event_enable_trigger_func, | |
1630 | .reg = event_enable_register_trigger, | |
1631 | .unreg = event_enable_unregister_trigger, | |
1632 | .get_trigger_ops = event_enable_get_trigger_ops, | |
bac5fb97 | 1633 | .set_filter = set_trigger_filter, |
7862ad18 TZ |
1634 | }; |
1635 | ||
1636 | static __init void unregister_trigger_enable_disable_cmds(void) | |
1637 | { | |
1638 | unregister_event_command(&trigger_enable_cmd); | |
1639 | unregister_event_command(&trigger_disable_cmd); | |
1640 | } | |
1641 | ||
1642 | static __init int register_trigger_enable_disable_cmds(void) | |
1643 | { | |
1644 | int ret; | |
1645 | ||
1646 | ret = register_event_command(&trigger_enable_cmd); | |
1647 | if (WARN_ON(ret < 0)) | |
1648 | return ret; | |
1649 | ret = register_event_command(&trigger_disable_cmd); | |
1650 | if (WARN_ON(ret < 0)) | |
1651 | unregister_trigger_enable_disable_cmds(); | |
1652 | ||
1653 | return ret; | |
1654 | } | |
1655 | ||
2a2df321 TZ |
1656 | static __init int register_trigger_traceon_traceoff_cmds(void) |
1657 | { | |
1658 | int ret; | |
1659 | ||
1660 | ret = register_event_command(&trigger_traceon_cmd); | |
1661 | if (WARN_ON(ret < 0)) | |
1662 | return ret; | |
1663 | ret = register_event_command(&trigger_traceoff_cmd); | |
1664 | if (WARN_ON(ret < 0)) | |
1665 | unregister_trigger_traceon_traceoff_cmds(); | |
1666 | ||
1667 | return ret; | |
1668 | } | |
1669 | ||
85f2b082 TZ |
1670 | __init int register_trigger_cmds(void) |
1671 | { | |
2a2df321 | 1672 | register_trigger_traceon_traceoff_cmds(); |
93e31ffb | 1673 | register_trigger_snapshot_cmd(); |
f21ecbb3 | 1674 | register_trigger_stacktrace_cmd(); |
7862ad18 | 1675 | register_trigger_enable_disable_cmds(); |
d0bad49b | 1676 | register_trigger_hist_enable_disable_cmds(); |
7ef224d1 | 1677 | register_trigger_hist_cmd(); |
2a2df321 | 1678 | |
85f2b082 TZ |
1679 | return 0; |
1680 | } |