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