Commit | Line | Data |
---|---|---|
b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
e6187007 SR |
11 | #include <linux/workqueue.h> |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/kthread.h> | |
b77e38aa SR |
14 | #include <linux/debugfs.h> |
15 | #include <linux/uaccess.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/ctype.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
e6187007 | 19 | #include <linux/delay.h> |
b77e38aa | 20 | |
020e5f85 LZ |
21 | #include <asm/setup.h> |
22 | ||
91729ef9 | 23 | #include "trace_output.h" |
b77e38aa | 24 | |
4e5292ea | 25 | #undef TRACE_SYSTEM |
b628b3e6 SR |
26 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
27 | ||
20c8928a | 28 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 29 | |
04295780 SR |
30 | DEFINE_MUTEX(event_storage_mutex); |
31 | EXPORT_SYMBOL_GPL(event_storage_mutex); | |
32 | ||
33 | char event_storage[EVENT_STORAGE_SIZE]; | |
34 | EXPORT_SYMBOL_GPL(event_storage); | |
35 | ||
a59fd602 | 36 | LIST_HEAD(ftrace_events); |
8728fe50 | 37 | LIST_HEAD(ftrace_common_fields); |
a59fd602 | 38 | |
2e33af02 SR |
39 | struct list_head * |
40 | trace_get_fields(struct ftrace_event_call *event_call) | |
41 | { | |
42 | if (!event_call->class->get_fields) | |
43 | return &event_call->class->fields; | |
44 | return event_call->class->get_fields(event_call); | |
45 | } | |
46 | ||
8728fe50 LZ |
47 | static int __trace_define_field(struct list_head *head, const char *type, |
48 | const char *name, int offset, int size, | |
49 | int is_signed, int filter_type) | |
cf027f64 TZ |
50 | { |
51 | struct ftrace_event_field *field; | |
52 | ||
fe9f57f2 | 53 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
54 | if (!field) |
55 | goto err; | |
fe9f57f2 | 56 | |
cf027f64 TZ |
57 | field->name = kstrdup(name, GFP_KERNEL); |
58 | if (!field->name) | |
59 | goto err; | |
fe9f57f2 | 60 | |
cf027f64 TZ |
61 | field->type = kstrdup(type, GFP_KERNEL); |
62 | if (!field->type) | |
63 | goto err; | |
fe9f57f2 | 64 | |
43b51ead LZ |
65 | if (filter_type == FILTER_OTHER) |
66 | field->filter_type = filter_assign_type(type); | |
67 | else | |
68 | field->filter_type = filter_type; | |
69 | ||
cf027f64 TZ |
70 | field->offset = offset; |
71 | field->size = size; | |
a118e4d1 | 72 | field->is_signed = is_signed; |
aa38e9fc | 73 | |
2e33af02 | 74 | list_add(&field->link, head); |
cf027f64 TZ |
75 | |
76 | return 0; | |
fe9f57f2 | 77 | |
cf027f64 | 78 | err: |
7b60997f | 79 | if (field) |
cf027f64 | 80 | kfree(field->name); |
cf027f64 | 81 | kfree(field); |
fe9f57f2 | 82 | |
cf027f64 TZ |
83 | return -ENOMEM; |
84 | } | |
8728fe50 LZ |
85 | |
86 | int trace_define_field(struct ftrace_event_call *call, const char *type, | |
87 | const char *name, int offset, int size, int is_signed, | |
88 | int filter_type) | |
89 | { | |
90 | struct list_head *head; | |
91 | ||
92 | if (WARN_ON(!call->class)) | |
93 | return 0; | |
94 | ||
95 | head = trace_get_fields(call); | |
96 | return __trace_define_field(head, type, name, offset, size, | |
97 | is_signed, filter_type); | |
98 | } | |
17c873ec | 99 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 100 | |
e647d6b3 | 101 | #define __common_field(type, item) \ |
8728fe50 LZ |
102 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
103 | "common_" #item, \ | |
104 | offsetof(typeof(ent), item), \ | |
105 | sizeof(ent.item), \ | |
106 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
107 | if (ret) \ |
108 | return ret; | |
109 | ||
8728fe50 | 110 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
111 | { |
112 | int ret; | |
113 | struct trace_entry ent; | |
114 | ||
115 | __common_field(unsigned short, type); | |
116 | __common_field(unsigned char, flags); | |
117 | __common_field(unsigned char, preempt_count); | |
118 | __common_field(int, pid); | |
a3a4a5ac | 119 | __common_field(int, padding); |
e647d6b3 LZ |
120 | |
121 | return ret; | |
122 | } | |
123 | ||
bd1a5c84 | 124 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
125 | { |
126 | struct ftrace_event_field *field, *next; | |
2e33af02 | 127 | struct list_head *head; |
2df75e41 | 128 | |
2e33af02 SR |
129 | head = trace_get_fields(call); |
130 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 LZ |
131 | list_del(&field->link); |
132 | kfree(field->type); | |
133 | kfree(field->name); | |
134 | kfree(field); | |
135 | } | |
136 | } | |
137 | ||
87d9b4e1 LZ |
138 | int trace_event_raw_init(struct ftrace_event_call *call) |
139 | { | |
140 | int id; | |
141 | ||
80decc70 | 142 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
143 | if (!id) |
144 | return -ENODEV; | |
87d9b4e1 LZ |
145 | |
146 | return 0; | |
147 | } | |
148 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
149 | ||
ceec0b6f JO |
150 | int ftrace_event_reg(struct ftrace_event_call *call, |
151 | enum trace_reg type, void *data) | |
a1d0ce82 SR |
152 | { |
153 | switch (type) { | |
154 | case TRACE_REG_REGISTER: | |
155 | return tracepoint_probe_register(call->name, | |
156 | call->class->probe, | |
157 | call); | |
158 | case TRACE_REG_UNREGISTER: | |
159 | tracepoint_probe_unregister(call->name, | |
160 | call->class->probe, | |
161 | call); | |
162 | return 0; | |
163 | ||
164 | #ifdef CONFIG_PERF_EVENTS | |
165 | case TRACE_REG_PERF_REGISTER: | |
166 | return tracepoint_probe_register(call->name, | |
167 | call->class->perf_probe, | |
168 | call); | |
169 | case TRACE_REG_PERF_UNREGISTER: | |
170 | tracepoint_probe_unregister(call->name, | |
171 | call->class->perf_probe, | |
172 | call); | |
173 | return 0; | |
ceec0b6f JO |
174 | case TRACE_REG_PERF_OPEN: |
175 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
176 | case TRACE_REG_PERF_ADD: |
177 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 178 | return 0; |
a1d0ce82 SR |
179 | #endif |
180 | } | |
181 | return 0; | |
182 | } | |
183 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
184 | ||
e870e9a1 LZ |
185 | void trace_event_enable_cmd_record(bool enable) |
186 | { | |
187 | struct ftrace_event_call *call; | |
188 | ||
189 | mutex_lock(&event_mutex); | |
190 | list_for_each_entry(call, &ftrace_events, list) { | |
191 | if (!(call->flags & TRACE_EVENT_FL_ENABLED)) | |
192 | continue; | |
193 | ||
194 | if (enable) { | |
195 | tracing_start_cmdline_record(); | |
196 | call->flags |= TRACE_EVENT_FL_RECORDED_CMD; | |
197 | } else { | |
198 | tracing_stop_cmdline_record(); | |
199 | call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD; | |
200 | } | |
201 | } | |
202 | mutex_unlock(&event_mutex); | |
203 | } | |
204 | ||
3b8e4273 | 205 | static int ftrace_event_enable_disable(struct ftrace_event_call *call, |
fd994989 SR |
206 | int enable) |
207 | { | |
3b8e4273 LZ |
208 | int ret = 0; |
209 | ||
fd994989 SR |
210 | switch (enable) { |
211 | case 0: | |
553552ce SR |
212 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
213 | call->flags &= ~TRACE_EVENT_FL_ENABLED; | |
e870e9a1 LZ |
214 | if (call->flags & TRACE_EVENT_FL_RECORDED_CMD) { |
215 | tracing_stop_cmdline_record(); | |
216 | call->flags &= ~TRACE_EVENT_FL_RECORDED_CMD; | |
217 | } | |
ceec0b6f | 218 | call->class->reg(call, TRACE_REG_UNREGISTER, NULL); |
fd994989 | 219 | } |
fd994989 SR |
220 | break; |
221 | case 1: | |
553552ce | 222 | if (!(call->flags & TRACE_EVENT_FL_ENABLED)) { |
e870e9a1 LZ |
223 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
224 | tracing_start_cmdline_record(); | |
225 | call->flags |= TRACE_EVENT_FL_RECORDED_CMD; | |
226 | } | |
ceec0b6f | 227 | ret = call->class->reg(call, TRACE_REG_REGISTER, NULL); |
3b8e4273 LZ |
228 | if (ret) { |
229 | tracing_stop_cmdline_record(); | |
230 | pr_info("event trace: Could not enable event " | |
231 | "%s\n", call->name); | |
232 | break; | |
233 | } | |
553552ce | 234 | call->flags |= TRACE_EVENT_FL_ENABLED; |
fd994989 | 235 | } |
fd994989 SR |
236 | break; |
237 | } | |
3b8e4273 LZ |
238 | |
239 | return ret; | |
fd994989 SR |
240 | } |
241 | ||
0e907c99 Z |
242 | static void ftrace_clear_events(void) |
243 | { | |
244 | struct ftrace_event_call *call; | |
245 | ||
246 | mutex_lock(&event_mutex); | |
247 | list_for_each_entry(call, &ftrace_events, list) { | |
248 | ftrace_event_enable_disable(call, 0); | |
249 | } | |
250 | mutex_unlock(&event_mutex); | |
251 | } | |
252 | ||
e9dbfae5 SR |
253 | static void __put_system(struct event_subsystem *system) |
254 | { | |
255 | struct event_filter *filter = system->filter; | |
256 | ||
257 | WARN_ON_ONCE(system->ref_count == 0); | |
258 | if (--system->ref_count) | |
259 | return; | |
260 | ||
261 | if (filter) { | |
262 | kfree(filter->filter_string); | |
263 | kfree(filter); | |
264 | } | |
265 | kfree(system->name); | |
266 | kfree(system); | |
267 | } | |
268 | ||
269 | static void __get_system(struct event_subsystem *system) | |
270 | { | |
271 | WARN_ON_ONCE(system->ref_count == 0); | |
272 | system->ref_count++; | |
273 | } | |
274 | ||
275 | static void put_system(struct event_subsystem *system) | |
276 | { | |
277 | mutex_lock(&event_mutex); | |
278 | __put_system(system); | |
279 | mutex_unlock(&event_mutex); | |
280 | } | |
281 | ||
8f31bfe5 LZ |
282 | /* |
283 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
284 | */ | |
285 | static int __ftrace_set_clr_event(const char *match, const char *sub, | |
286 | const char *event, int set) | |
b77e38aa | 287 | { |
a59fd602 | 288 | struct ftrace_event_call *call; |
29f93943 | 289 | int ret = -EINVAL; |
8f31bfe5 LZ |
290 | |
291 | mutex_lock(&event_mutex); | |
292 | list_for_each_entry(call, &ftrace_events, list) { | |
293 | ||
a1d0ce82 | 294 | if (!call->name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
295 | continue; |
296 | ||
9b63776f SR |
297 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
298 | continue; | |
299 | ||
8f31bfe5 LZ |
300 | if (match && |
301 | strcmp(match, call->name) != 0 && | |
8f082018 | 302 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
303 | continue; |
304 | ||
8f082018 | 305 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
306 | continue; |
307 | ||
308 | if (event && strcmp(event, call->name) != 0) | |
309 | continue; | |
310 | ||
311 | ftrace_event_enable_disable(call, set); | |
312 | ||
313 | ret = 0; | |
314 | } | |
315 | mutex_unlock(&event_mutex); | |
316 | ||
317 | return ret; | |
318 | } | |
319 | ||
320 | static int ftrace_set_clr_event(char *buf, int set) | |
321 | { | |
b628b3e6 | 322 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
323 | |
324 | /* | |
325 | * The buf format can be <subsystem>:<event-name> | |
326 | * *:<event-name> means any event by that name. | |
327 | * :<event-name> is the same. | |
328 | * | |
329 | * <subsystem>:* means all events in that subsystem | |
330 | * <subsystem>: means the same. | |
331 | * | |
332 | * <name> (no ':') means all events in a subsystem with | |
333 | * the name <name> or any event that matches <name> | |
334 | */ | |
335 | ||
336 | match = strsep(&buf, ":"); | |
337 | if (buf) { | |
338 | sub = match; | |
339 | event = buf; | |
340 | match = NULL; | |
341 | ||
342 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
343 | sub = NULL; | |
344 | if (!strlen(event) || strcmp(event, "*") == 0) | |
345 | event = NULL; | |
346 | } | |
b77e38aa | 347 | |
8f31bfe5 | 348 | return __ftrace_set_clr_event(match, sub, event, set); |
b77e38aa SR |
349 | } |
350 | ||
4671c794 SR |
351 | /** |
352 | * trace_set_clr_event - enable or disable an event | |
353 | * @system: system name to match (NULL for any system) | |
354 | * @event: event name to match (NULL for all events, within system) | |
355 | * @set: 1 to enable, 0 to disable | |
356 | * | |
357 | * This is a way for other parts of the kernel to enable or disable | |
358 | * event recording. | |
359 | * | |
360 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
361 | * registered events. | |
362 | */ | |
363 | int trace_set_clr_event(const char *system, const char *event, int set) | |
364 | { | |
365 | return __ftrace_set_clr_event(NULL, system, event, set); | |
366 | } | |
56355b83 | 367 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 368 | |
b77e38aa SR |
369 | /* 128 should be much more than enough */ |
370 | #define EVENT_BUF_SIZE 127 | |
371 | ||
372 | static ssize_t | |
373 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
374 | size_t cnt, loff_t *ppos) | |
375 | { | |
48966364 | 376 | struct trace_parser parser; |
4ba7978e | 377 | ssize_t read, ret; |
b77e38aa | 378 | |
4ba7978e | 379 | if (!cnt) |
b77e38aa SR |
380 | return 0; |
381 | ||
1852fcce SR |
382 | ret = tracing_update_buffers(); |
383 | if (ret < 0) | |
384 | return ret; | |
385 | ||
48966364 | 386 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
387 | return -ENOMEM; |
388 | ||
48966364 | 389 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
390 | ||
4ba7978e | 391 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 392 | int set = 1; |
b77e38aa | 393 | |
48966364 | 394 | if (*parser.buffer == '!') |
b77e38aa | 395 | set = 0; |
b77e38aa | 396 | |
48966364 | 397 | parser.buffer[parser.idx] = 0; |
398 | ||
399 | ret = ftrace_set_clr_event(parser.buffer + !set, set); | |
b77e38aa | 400 | if (ret) |
48966364 | 401 | goto out_put; |
b77e38aa | 402 | } |
b77e38aa SR |
403 | |
404 | ret = read; | |
405 | ||
48966364 | 406 | out_put: |
407 | trace_parser_put(&parser); | |
b77e38aa SR |
408 | |
409 | return ret; | |
410 | } | |
411 | ||
412 | static void * | |
413 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
414 | { | |
30bd39cd | 415 | struct ftrace_event_call *call = v; |
b77e38aa SR |
416 | |
417 | (*pos)++; | |
418 | ||
30bd39cd | 419 | list_for_each_entry_continue(call, &ftrace_events, list) { |
40e26815 SR |
420 | /* |
421 | * The ftrace subsystem is for showing formats only. | |
422 | * They can not be enabled or disabled via the event files. | |
423 | */ | |
a1d0ce82 | 424 | if (call->class && call->class->reg) |
30bd39cd | 425 | return call; |
40e26815 | 426 | } |
b77e38aa | 427 | |
30bd39cd | 428 | return NULL; |
b77e38aa SR |
429 | } |
430 | ||
431 | static void *t_start(struct seq_file *m, loff_t *pos) | |
432 | { | |
30bd39cd | 433 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
434 | loff_t l; |
435 | ||
20c8928a | 436 | mutex_lock(&event_mutex); |
e1c7e2a6 | 437 | |
30bd39cd | 438 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 439 | for (l = 0; l <= *pos; ) { |
30bd39cd | 440 | call = t_next(m, call, &l); |
e1c7e2a6 LZ |
441 | if (!call) |
442 | break; | |
443 | } | |
444 | return call; | |
b77e38aa SR |
445 | } |
446 | ||
447 | static void * | |
448 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
449 | { | |
30bd39cd | 450 | struct ftrace_event_call *call = v; |
b77e38aa SR |
451 | |
452 | (*pos)++; | |
453 | ||
30bd39cd | 454 | list_for_each_entry_continue(call, &ftrace_events, list) { |
553552ce | 455 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
30bd39cd | 456 | return call; |
b77e38aa SR |
457 | } |
458 | ||
30bd39cd | 459 | return NULL; |
b77e38aa SR |
460 | } |
461 | ||
462 | static void *s_start(struct seq_file *m, loff_t *pos) | |
463 | { | |
30bd39cd | 464 | struct ftrace_event_call *call; |
e1c7e2a6 LZ |
465 | loff_t l; |
466 | ||
20c8928a | 467 | mutex_lock(&event_mutex); |
e1c7e2a6 | 468 | |
30bd39cd | 469 | call = list_entry(&ftrace_events, struct ftrace_event_call, list); |
e1c7e2a6 | 470 | for (l = 0; l <= *pos; ) { |
30bd39cd | 471 | call = s_next(m, call, &l); |
e1c7e2a6 LZ |
472 | if (!call) |
473 | break; | |
474 | } | |
475 | return call; | |
b77e38aa SR |
476 | } |
477 | ||
478 | static int t_show(struct seq_file *m, void *v) | |
479 | { | |
480 | struct ftrace_event_call *call = v; | |
481 | ||
8f082018 SR |
482 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
483 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
484 | seq_printf(m, "%s\n", call->name); |
485 | ||
486 | return 0; | |
487 | } | |
488 | ||
489 | static void t_stop(struct seq_file *m, void *p) | |
490 | { | |
20c8928a | 491 | mutex_unlock(&event_mutex); |
b77e38aa SR |
492 | } |
493 | ||
1473e441 SR |
494 | static ssize_t |
495 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
496 | loff_t *ppos) | |
497 | { | |
498 | struct ftrace_event_call *call = filp->private_data; | |
499 | char *buf; | |
500 | ||
553552ce | 501 | if (call->flags & TRACE_EVENT_FL_ENABLED) |
1473e441 SR |
502 | buf = "1\n"; |
503 | else | |
504 | buf = "0\n"; | |
505 | ||
506 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
507 | } | |
508 | ||
509 | static ssize_t | |
510 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
511 | loff_t *ppos) | |
512 | { | |
513 | struct ftrace_event_call *call = filp->private_data; | |
1473e441 SR |
514 | unsigned long val; |
515 | int ret; | |
516 | ||
22fe9b54 PH |
517 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
518 | if (ret) | |
1473e441 SR |
519 | return ret; |
520 | ||
1852fcce SR |
521 | ret = tracing_update_buffers(); |
522 | if (ret < 0) | |
523 | return ret; | |
524 | ||
1473e441 SR |
525 | switch (val) { |
526 | case 0: | |
1473e441 | 527 | case 1: |
11a241a3 | 528 | mutex_lock(&event_mutex); |
3b8e4273 | 529 | ret = ftrace_event_enable_disable(call, val); |
11a241a3 | 530 | mutex_unlock(&event_mutex); |
1473e441 SR |
531 | break; |
532 | ||
533 | default: | |
534 | return -EINVAL; | |
535 | } | |
536 | ||
537 | *ppos += cnt; | |
538 | ||
3b8e4273 | 539 | return ret ? ret : cnt; |
1473e441 SR |
540 | } |
541 | ||
8ae79a13 SR |
542 | static ssize_t |
543 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
544 | loff_t *ppos) | |
545 | { | |
c142b15d | 546 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
40ee4dff | 547 | struct event_subsystem *system = filp->private_data; |
8ae79a13 SR |
548 | struct ftrace_event_call *call; |
549 | char buf[2]; | |
c142b15d | 550 | int set = 0; |
8ae79a13 SR |
551 | int ret; |
552 | ||
8ae79a13 SR |
553 | mutex_lock(&event_mutex); |
554 | list_for_each_entry(call, &ftrace_events, list) { | |
a1d0ce82 | 555 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
556 | continue; |
557 | ||
40ee4dff | 558 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
559 | continue; |
560 | ||
561 | /* | |
562 | * We need to find out if all the events are set | |
563 | * or if all events or cleared, or if we have | |
564 | * a mixture. | |
565 | */ | |
553552ce | 566 | set |= (1 << !!(call->flags & TRACE_EVENT_FL_ENABLED)); |
c142b15d | 567 | |
8ae79a13 SR |
568 | /* |
569 | * If we have a mixture, no need to look further. | |
570 | */ | |
c142b15d | 571 | if (set == 3) |
8ae79a13 SR |
572 | break; |
573 | } | |
574 | mutex_unlock(&event_mutex); | |
575 | ||
c142b15d | 576 | buf[0] = set_to_char[set]; |
8ae79a13 | 577 | buf[1] = '\n'; |
8ae79a13 SR |
578 | |
579 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
580 | ||
581 | return ret; | |
582 | } | |
583 | ||
584 | static ssize_t | |
585 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
586 | loff_t *ppos) | |
587 | { | |
40ee4dff SR |
588 | struct event_subsystem *system = filp->private_data; |
589 | const char *name = NULL; | |
8ae79a13 | 590 | unsigned long val; |
8ae79a13 SR |
591 | ssize_t ret; |
592 | ||
22fe9b54 PH |
593 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
594 | if (ret) | |
8ae79a13 SR |
595 | return ret; |
596 | ||
597 | ret = tracing_update_buffers(); | |
598 | if (ret < 0) | |
599 | return ret; | |
600 | ||
8f31bfe5 | 601 | if (val != 0 && val != 1) |
8ae79a13 | 602 | return -EINVAL; |
8ae79a13 | 603 | |
40ee4dff SR |
604 | /* |
605 | * Opening of "enable" adds a ref count to system, | |
606 | * so the name is safe to use. | |
607 | */ | |
608 | if (system) | |
609 | name = system->name; | |
610 | ||
611 | ret = __ftrace_set_clr_event(NULL, name, NULL, val); | |
8ae79a13 | 612 | if (ret) |
8f31bfe5 | 613 | goto out; |
8ae79a13 SR |
614 | |
615 | ret = cnt; | |
616 | ||
8f31bfe5 | 617 | out: |
8ae79a13 SR |
618 | *ppos += cnt; |
619 | ||
620 | return ret; | |
621 | } | |
622 | ||
2a37a3df SR |
623 | enum { |
624 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
625 | FORMAT_FIELD_SEPERATOR = 2, |
626 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
627 | }; |
628 | ||
629 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 630 | { |
2a37a3df | 631 | struct ftrace_event_call *call = m->private; |
5a65e956 | 632 | struct ftrace_event_field *field; |
86397dc3 LZ |
633 | struct list_head *common_head = &ftrace_common_fields; |
634 | struct list_head *head = trace_get_fields(call); | |
981d081e | 635 | |
2a37a3df | 636 | (*pos)++; |
5a65e956 | 637 | |
2a37a3df SR |
638 | switch ((unsigned long)v) { |
639 | case FORMAT_HEADER: | |
86397dc3 LZ |
640 | if (unlikely(list_empty(common_head))) |
641 | return NULL; | |
642 | ||
643 | field = list_entry(common_head->prev, | |
644 | struct ftrace_event_field, link); | |
645 | return field; | |
5a65e956 | 646 | |
86397dc3 | 647 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
648 | if (unlikely(list_empty(head))) |
649 | return NULL; | |
5a65e956 | 650 | |
2a37a3df SR |
651 | field = list_entry(head->prev, struct ftrace_event_field, link); |
652 | return field; | |
5a65e956 | 653 | |
2a37a3df SR |
654 | case FORMAT_PRINTFMT: |
655 | /* all done */ | |
656 | return NULL; | |
5a65e956 LJ |
657 | } |
658 | ||
2a37a3df | 659 | field = v; |
86397dc3 LZ |
660 | if (field->link.prev == common_head) |
661 | return (void *)FORMAT_FIELD_SEPERATOR; | |
662 | else if (field->link.prev == head) | |
2a37a3df SR |
663 | return (void *)FORMAT_PRINTFMT; |
664 | ||
665 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
666 | ||
2a37a3df | 667 | return field; |
8728fe50 | 668 | } |
5a65e956 | 669 | |
2a37a3df | 670 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 671 | { |
2a37a3df SR |
672 | loff_t l = 0; |
673 | void *p; | |
5a65e956 | 674 | |
2a37a3df SR |
675 | /* Start by showing the header */ |
676 | if (!*pos) | |
677 | return (void *)FORMAT_HEADER; | |
678 | ||
679 | p = (void *)FORMAT_HEADER; | |
680 | do { | |
681 | p = f_next(m, p, &l); | |
682 | } while (p && l < *pos); | |
683 | ||
684 | return p; | |
685 | } | |
686 | ||
687 | static int f_show(struct seq_file *m, void *v) | |
688 | { | |
689 | struct ftrace_event_call *call = m->private; | |
690 | struct ftrace_event_field *field; | |
691 | const char *array_descriptor; | |
692 | ||
693 | switch ((unsigned long)v) { | |
694 | case FORMAT_HEADER: | |
695 | seq_printf(m, "name: %s\n", call->name); | |
696 | seq_printf(m, "ID: %d\n", call->event.type); | |
697 | seq_printf(m, "format:\n"); | |
8728fe50 | 698 | return 0; |
5a65e956 | 699 | |
86397dc3 LZ |
700 | case FORMAT_FIELD_SEPERATOR: |
701 | seq_putc(m, '\n'); | |
702 | return 0; | |
703 | ||
2a37a3df SR |
704 | case FORMAT_PRINTFMT: |
705 | seq_printf(m, "\nprint fmt: %s\n", | |
706 | call->print_fmt); | |
707 | return 0; | |
981d081e | 708 | } |
8728fe50 | 709 | |
2a37a3df | 710 | field = v; |
8728fe50 | 711 | |
2a37a3df SR |
712 | /* |
713 | * Smartly shows the array type(except dynamic array). | |
714 | * Normal: | |
715 | * field:TYPE VAR | |
716 | * If TYPE := TYPE[LEN], it is shown: | |
717 | * field:TYPE VAR[LEN] | |
718 | */ | |
719 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 720 | |
2a37a3df SR |
721 | if (!strncmp(field->type, "__data_loc", 10)) |
722 | array_descriptor = NULL; | |
8728fe50 | 723 | |
2a37a3df SR |
724 | if (!array_descriptor) |
725 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
726 | field->type, field->name, field->offset, | |
727 | field->size, !!field->is_signed); | |
728 | else | |
729 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
730 | (int)(array_descriptor - field->type), | |
731 | field->type, field->name, | |
732 | array_descriptor, field->offset, | |
733 | field->size, !!field->is_signed); | |
8728fe50 | 734 | |
2a37a3df SR |
735 | return 0; |
736 | } | |
5a65e956 | 737 | |
2a37a3df SR |
738 | static void f_stop(struct seq_file *m, void *p) |
739 | { | |
740 | } | |
981d081e | 741 | |
2a37a3df SR |
742 | static const struct seq_operations trace_format_seq_ops = { |
743 | .start = f_start, | |
744 | .next = f_next, | |
745 | .stop = f_stop, | |
746 | .show = f_show, | |
747 | }; | |
748 | ||
749 | static int trace_format_open(struct inode *inode, struct file *file) | |
750 | { | |
751 | struct ftrace_event_call *call = inode->i_private; | |
752 | struct seq_file *m; | |
753 | int ret; | |
754 | ||
755 | ret = seq_open(file, &trace_format_seq_ops); | |
756 | if (ret < 0) | |
757 | return ret; | |
758 | ||
759 | m = file->private_data; | |
760 | m->private = call; | |
761 | ||
762 | return 0; | |
981d081e SR |
763 | } |
764 | ||
23725aee PZ |
765 | static ssize_t |
766 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
767 | { | |
768 | struct ftrace_event_call *call = filp->private_data; | |
769 | struct trace_seq *s; | |
770 | int r; | |
771 | ||
772 | if (*ppos) | |
773 | return 0; | |
774 | ||
775 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
776 | if (!s) | |
777 | return -ENOMEM; | |
778 | ||
779 | trace_seq_init(s); | |
32c0edae | 780 | trace_seq_printf(s, "%d\n", call->event.type); |
23725aee PZ |
781 | |
782 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
783 | s->buffer, s->len); | |
784 | kfree(s); | |
785 | return r; | |
786 | } | |
787 | ||
7ce7e424 TZ |
788 | static ssize_t |
789 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
790 | loff_t *ppos) | |
791 | { | |
792 | struct ftrace_event_call *call = filp->private_data; | |
793 | struct trace_seq *s; | |
794 | int r; | |
795 | ||
796 | if (*ppos) | |
797 | return 0; | |
798 | ||
799 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
800 | if (!s) | |
801 | return -ENOMEM; | |
802 | ||
803 | trace_seq_init(s); | |
804 | ||
8b372562 | 805 | print_event_filter(call, s); |
4bda2d51 | 806 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
807 | |
808 | kfree(s); | |
809 | ||
810 | return r; | |
811 | } | |
812 | ||
813 | static ssize_t | |
814 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
815 | loff_t *ppos) | |
816 | { | |
817 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 818 | char *buf; |
7ce7e424 TZ |
819 | int err; |
820 | ||
8b372562 | 821 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
822 | return -EINVAL; |
823 | ||
8b372562 TZ |
824 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
825 | if (!buf) | |
7ce7e424 TZ |
826 | return -ENOMEM; |
827 | ||
8b372562 TZ |
828 | if (copy_from_user(buf, ubuf, cnt)) { |
829 | free_page((unsigned long) buf); | |
830 | return -EFAULT; | |
7ce7e424 | 831 | } |
8b372562 | 832 | buf[cnt] = '\0'; |
7ce7e424 | 833 | |
8b372562 TZ |
834 | err = apply_event_filter(call, buf); |
835 | free_page((unsigned long) buf); | |
836 | if (err < 0) | |
44e9c8b7 | 837 | return err; |
0a19e53c | 838 | |
7ce7e424 TZ |
839 | *ppos += cnt; |
840 | ||
841 | return cnt; | |
842 | } | |
843 | ||
e9dbfae5 SR |
844 | static LIST_HEAD(event_subsystems); |
845 | ||
846 | static int subsystem_open(struct inode *inode, struct file *filp) | |
847 | { | |
848 | struct event_subsystem *system = NULL; | |
849 | int ret; | |
850 | ||
40ee4dff SR |
851 | if (!inode->i_private) |
852 | goto skip_search; | |
853 | ||
e9dbfae5 SR |
854 | /* Make sure the system still exists */ |
855 | mutex_lock(&event_mutex); | |
856 | list_for_each_entry(system, &event_subsystems, list) { | |
857 | if (system == inode->i_private) { | |
858 | /* Don't open systems with no events */ | |
859 | if (!system->nr_events) { | |
860 | system = NULL; | |
861 | break; | |
862 | } | |
863 | __get_system(system); | |
864 | break; | |
865 | } | |
866 | } | |
867 | mutex_unlock(&event_mutex); | |
868 | ||
869 | if (system != inode->i_private) | |
870 | return -ENODEV; | |
871 | ||
40ee4dff | 872 | skip_search: |
e9dbfae5 | 873 | ret = tracing_open_generic(inode, filp); |
40ee4dff | 874 | if (ret < 0 && system) |
e9dbfae5 SR |
875 | put_system(system); |
876 | ||
877 | return ret; | |
878 | } | |
879 | ||
880 | static int subsystem_release(struct inode *inode, struct file *file) | |
881 | { | |
882 | struct event_subsystem *system = inode->i_private; | |
883 | ||
40ee4dff SR |
884 | if (system) |
885 | put_system(system); | |
e9dbfae5 SR |
886 | |
887 | return 0; | |
888 | } | |
889 | ||
cfb180f3 TZ |
890 | static ssize_t |
891 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
892 | loff_t *ppos) | |
893 | { | |
894 | struct event_subsystem *system = filp->private_data; | |
895 | struct trace_seq *s; | |
896 | int r; | |
897 | ||
898 | if (*ppos) | |
899 | return 0; | |
900 | ||
901 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
902 | if (!s) | |
903 | return -ENOMEM; | |
904 | ||
905 | trace_seq_init(s); | |
906 | ||
8b372562 | 907 | print_subsystem_event_filter(system, s); |
4bda2d51 | 908 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
909 | |
910 | kfree(s); | |
911 | ||
912 | return r; | |
913 | } | |
914 | ||
915 | static ssize_t | |
916 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
917 | loff_t *ppos) | |
918 | { | |
919 | struct event_subsystem *system = filp->private_data; | |
8b372562 | 920 | char *buf; |
cfb180f3 TZ |
921 | int err; |
922 | ||
8b372562 | 923 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
924 | return -EINVAL; |
925 | ||
8b372562 TZ |
926 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
927 | if (!buf) | |
cfb180f3 TZ |
928 | return -ENOMEM; |
929 | ||
8b372562 TZ |
930 | if (copy_from_user(buf, ubuf, cnt)) { |
931 | free_page((unsigned long) buf); | |
932 | return -EFAULT; | |
cfb180f3 | 933 | } |
8b372562 | 934 | buf[cnt] = '\0'; |
cfb180f3 | 935 | |
8b372562 TZ |
936 | err = apply_subsystem_event_filter(system, buf); |
937 | free_page((unsigned long) buf); | |
938 | if (err < 0) | |
44e9c8b7 | 939 | return err; |
cfb180f3 TZ |
940 | |
941 | *ppos += cnt; | |
942 | ||
943 | return cnt; | |
944 | } | |
945 | ||
d1b182a8 SR |
946 | static ssize_t |
947 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
948 | { | |
949 | int (*func)(struct trace_seq *s) = filp->private_data; | |
950 | struct trace_seq *s; | |
951 | int r; | |
952 | ||
953 | if (*ppos) | |
954 | return 0; | |
955 | ||
956 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
957 | if (!s) | |
958 | return -ENOMEM; | |
959 | ||
960 | trace_seq_init(s); | |
961 | ||
962 | func(s); | |
963 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
964 | ||
965 | kfree(s); | |
966 | ||
967 | return r; | |
968 | } | |
969 | ||
15075cac SR |
970 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
971 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
972 | ||
b77e38aa SR |
973 | static const struct seq_operations show_event_seq_ops = { |
974 | .start = t_start, | |
975 | .next = t_next, | |
976 | .show = t_show, | |
977 | .stop = t_stop, | |
978 | }; | |
979 | ||
980 | static const struct seq_operations show_set_event_seq_ops = { | |
981 | .start = s_start, | |
982 | .next = s_next, | |
983 | .show = t_show, | |
984 | .stop = t_stop, | |
985 | }; | |
986 | ||
2314c4ae | 987 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 988 | .open = ftrace_event_avail_open, |
2314c4ae SR |
989 | .read = seq_read, |
990 | .llseek = seq_lseek, | |
991 | .release = seq_release, | |
992 | }; | |
993 | ||
b77e38aa | 994 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 995 | .open = ftrace_event_set_open, |
b77e38aa SR |
996 | .read = seq_read, |
997 | .write = ftrace_event_write, | |
998 | .llseek = seq_lseek, | |
999 | .release = seq_release, | |
1000 | }; | |
1001 | ||
1473e441 SR |
1002 | static const struct file_operations ftrace_enable_fops = { |
1003 | .open = tracing_open_generic, | |
1004 | .read = event_enable_read, | |
1005 | .write = event_enable_write, | |
6038f373 | 1006 | .llseek = default_llseek, |
1473e441 SR |
1007 | }; |
1008 | ||
981d081e | 1009 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1010 | .open = trace_format_open, |
1011 | .read = seq_read, | |
1012 | .llseek = seq_lseek, | |
1013 | .release = seq_release, | |
981d081e SR |
1014 | }; |
1015 | ||
23725aee PZ |
1016 | static const struct file_operations ftrace_event_id_fops = { |
1017 | .open = tracing_open_generic, | |
1018 | .read = event_id_read, | |
6038f373 | 1019 | .llseek = default_llseek, |
23725aee PZ |
1020 | }; |
1021 | ||
7ce7e424 TZ |
1022 | static const struct file_operations ftrace_event_filter_fops = { |
1023 | .open = tracing_open_generic, | |
1024 | .read = event_filter_read, | |
1025 | .write = event_filter_write, | |
6038f373 | 1026 | .llseek = default_llseek, |
7ce7e424 TZ |
1027 | }; |
1028 | ||
cfb180f3 | 1029 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1030 | .open = subsystem_open, |
cfb180f3 TZ |
1031 | .read = subsystem_filter_read, |
1032 | .write = subsystem_filter_write, | |
6038f373 | 1033 | .llseek = default_llseek, |
e9dbfae5 | 1034 | .release = subsystem_release, |
cfb180f3 TZ |
1035 | }; |
1036 | ||
8ae79a13 | 1037 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1038 | .open = subsystem_open, |
8ae79a13 SR |
1039 | .read = system_enable_read, |
1040 | .write = system_enable_write, | |
6038f373 | 1041 | .llseek = default_llseek, |
40ee4dff | 1042 | .release = subsystem_release, |
8ae79a13 SR |
1043 | }; |
1044 | ||
d1b182a8 SR |
1045 | static const struct file_operations ftrace_show_header_fops = { |
1046 | .open = tracing_open_generic, | |
1047 | .read = show_header, | |
6038f373 | 1048 | .llseek = default_llseek, |
d1b182a8 SR |
1049 | }; |
1050 | ||
1473e441 SR |
1051 | static struct dentry *event_trace_events_dir(void) |
1052 | { | |
1053 | static struct dentry *d_tracer; | |
1054 | static struct dentry *d_events; | |
1055 | ||
1056 | if (d_events) | |
1057 | return d_events; | |
1058 | ||
1059 | d_tracer = tracing_init_dentry(); | |
1060 | if (!d_tracer) | |
1061 | return NULL; | |
1062 | ||
1063 | d_events = debugfs_create_dir("events", d_tracer); | |
1064 | if (!d_events) | |
1065 | pr_warning("Could not create debugfs " | |
1066 | "'events' directory\n"); | |
1067 | ||
1068 | return d_events; | |
1069 | } | |
1070 | ||
15075cac SR |
1071 | static int |
1072 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1073 | { | |
1074 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1075 | ||
1076 | return seq_open(file, seq_ops); | |
1077 | } | |
1078 | ||
1079 | static int | |
1080 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1081 | { | |
1082 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
1083 | ||
1084 | if ((file->f_mode & FMODE_WRITE) && | |
1085 | (file->f_flags & O_TRUNC)) | |
1086 | ftrace_clear_events(); | |
1087 | ||
1088 | return seq_open(file, seq_ops); | |
1089 | } | |
1090 | ||
6ecc2d1c SR |
1091 | static struct dentry * |
1092 | event_subsystem_dir(const char *name, struct dentry *d_events) | |
1093 | { | |
1094 | struct event_subsystem *system; | |
e1112b4d | 1095 | struct dentry *entry; |
6ecc2d1c SR |
1096 | |
1097 | /* First see if we did not already create this dir */ | |
1098 | list_for_each_entry(system, &event_subsystems, list) { | |
dc82ec98 XG |
1099 | if (strcmp(system->name, name) == 0) { |
1100 | system->nr_events++; | |
6ecc2d1c | 1101 | return system->entry; |
dc82ec98 | 1102 | } |
6ecc2d1c SR |
1103 | } |
1104 | ||
1105 | /* need to create new entry */ | |
1106 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1107 | if (!system) { | |
1108 | pr_warning("No memory to create event subsystem %s\n", | |
1109 | name); | |
1110 | return d_events; | |
1111 | } | |
1112 | ||
1113 | system->entry = debugfs_create_dir(name, d_events); | |
1114 | if (!system->entry) { | |
1115 | pr_warning("Could not create event subsystem %s\n", | |
1116 | name); | |
1117 | kfree(system); | |
1118 | return d_events; | |
1119 | } | |
1120 | ||
dc82ec98 | 1121 | system->nr_events = 1; |
e9dbfae5 | 1122 | system->ref_count = 1; |
6d723736 SR |
1123 | system->name = kstrdup(name, GFP_KERNEL); |
1124 | if (!system->name) { | |
1125 | debugfs_remove(system->entry); | |
1126 | kfree(system); | |
1127 | return d_events; | |
1128 | } | |
1129 | ||
6ecc2d1c SR |
1130 | list_add(&system->list, &event_subsystems); |
1131 | ||
30e673b2 | 1132 | system->filter = NULL; |
cfb180f3 | 1133 | |
8b372562 TZ |
1134 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); |
1135 | if (!system->filter) { | |
1136 | pr_warning("Could not allocate filter for subsystem " | |
1137 | "'%s'\n", name); | |
1138 | return system->entry; | |
1139 | } | |
1140 | ||
e1112b4d TZ |
1141 | entry = debugfs_create_file("filter", 0644, system->entry, system, |
1142 | &ftrace_subsystem_filter_fops); | |
8b372562 TZ |
1143 | if (!entry) { |
1144 | kfree(system->filter); | |
1145 | system->filter = NULL; | |
e1112b4d TZ |
1146 | pr_warning("Could not create debugfs " |
1147 | "'%s/filter' entry\n", name); | |
8b372562 | 1148 | } |
e1112b4d | 1149 | |
40ee4dff | 1150 | trace_create_file("enable", 0644, system->entry, system, |
f3f3f009 | 1151 | &ftrace_system_enable_fops); |
8ae79a13 | 1152 | |
6ecc2d1c SR |
1153 | return system->entry; |
1154 | } | |
1155 | ||
1473e441 | 1156 | static int |
701970b3 SR |
1157 | event_create_dir(struct ftrace_event_call *call, struct dentry *d_events, |
1158 | const struct file_operations *id, | |
1159 | const struct file_operations *enable, | |
1160 | const struct file_operations *filter, | |
1161 | const struct file_operations *format) | |
1473e441 | 1162 | { |
2e33af02 | 1163 | struct list_head *head; |
fd994989 | 1164 | int ret; |
1473e441 | 1165 | |
6ecc2d1c SR |
1166 | /* |
1167 | * If the trace point header did not define TRACE_SYSTEM | |
1168 | * then the system would be called "TRACE_SYSTEM". | |
1169 | */ | |
8f082018 SR |
1170 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
1171 | d_events = event_subsystem_dir(call->class->system, d_events); | |
6ecc2d1c | 1172 | |
1473e441 SR |
1173 | call->dir = debugfs_create_dir(call->name, d_events); |
1174 | if (!call->dir) { | |
1175 | pr_warning("Could not create debugfs " | |
1176 | "'%s' directory\n", call->name); | |
1177 | return -1; | |
1178 | } | |
1179 | ||
9b63776f | 1180 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
f3f3f009 FW |
1181 | trace_create_file("enable", 0644, call->dir, call, |
1182 | enable); | |
1473e441 | 1183 | |
2239291a | 1184 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1185 | if (call->event.type && call->class->reg) |
f3f3f009 FW |
1186 | trace_create_file("id", 0444, call->dir, call, |
1187 | id); | |
2239291a | 1188 | #endif |
23725aee | 1189 | |
c9d932cf LZ |
1190 | /* |
1191 | * Other events may have the same class. Only update | |
1192 | * the fields if they are not already defined. | |
1193 | */ | |
1194 | head = trace_get_fields(call); | |
1195 | if (list_empty(head)) { | |
1196 | ret = call->class->define_fields(call); | |
1197 | if (ret < 0) { | |
1198 | pr_warning("Could not initialize trace point" | |
1199 | " events/%s\n", call->name); | |
1200 | return ret; | |
cf027f64 TZ |
1201 | } |
1202 | } | |
c9d932cf LZ |
1203 | trace_create_file("filter", 0644, call->dir, call, |
1204 | filter); | |
cf027f64 | 1205 | |
f3f3f009 FW |
1206 | trace_create_file("format", 0444, call->dir, call, |
1207 | format); | |
6d723736 SR |
1208 | |
1209 | return 0; | |
1210 | } | |
1211 | ||
8781915a EG |
1212 | static void event_remove(struct ftrace_event_call *call) |
1213 | { | |
1214 | ftrace_event_enable_disable(call, 0); | |
1215 | if (call->event.funcs) | |
1216 | __unregister_ftrace_event(&call->event); | |
1217 | list_del(&call->list); | |
1218 | } | |
1219 | ||
1220 | static int event_init(struct ftrace_event_call *call) | |
1221 | { | |
1222 | int ret = 0; | |
1223 | ||
1224 | if (WARN_ON(!call->name)) | |
1225 | return -EINVAL; | |
1226 | ||
1227 | if (call->class->raw_init) { | |
1228 | ret = call->class->raw_init(call); | |
1229 | if (ret < 0 && ret != -ENOSYS) | |
1230 | pr_warn("Could not initialize trace events/%s\n", | |
1231 | call->name); | |
1232 | } | |
1233 | ||
1234 | return ret; | |
1235 | } | |
1236 | ||
67ead0a6 LZ |
1237 | static int |
1238 | __trace_add_event_call(struct ftrace_event_call *call, struct module *mod, | |
1239 | const struct file_operations *id, | |
1240 | const struct file_operations *enable, | |
1241 | const struct file_operations *filter, | |
1242 | const struct file_operations *format) | |
bd1a5c84 MH |
1243 | { |
1244 | struct dentry *d_events; | |
1245 | int ret; | |
6d723736 | 1246 | |
8781915a EG |
1247 | ret = event_init(call); |
1248 | if (ret < 0) | |
1249 | return ret; | |
701970b3 | 1250 | |
bd1a5c84 MH |
1251 | d_events = event_trace_events_dir(); |
1252 | if (!d_events) | |
1253 | return -ENOENT; | |
1254 | ||
67ead0a6 | 1255 | ret = event_create_dir(call, d_events, id, enable, filter, format); |
88f70d75 MH |
1256 | if (!ret) |
1257 | list_add(&call->list, &ftrace_events); | |
67ead0a6 | 1258 | call->mod = mod; |
88f70d75 | 1259 | |
588bebb7 | 1260 | return ret; |
bd1a5c84 MH |
1261 | } |
1262 | ||
1263 | /* Add an additional event_call dynamically */ | |
1264 | int trace_add_event_call(struct ftrace_event_call *call) | |
1265 | { | |
1266 | int ret; | |
1267 | mutex_lock(&event_mutex); | |
67ead0a6 LZ |
1268 | ret = __trace_add_event_call(call, NULL, &ftrace_event_id_fops, |
1269 | &ftrace_enable_fops, | |
1270 | &ftrace_event_filter_fops, | |
1271 | &ftrace_event_format_fops); | |
bd1a5c84 MH |
1272 | mutex_unlock(&event_mutex); |
1273 | return ret; | |
1274 | } | |
701970b3 | 1275 | |
a2ca5e03 FW |
1276 | static void remove_subsystem_dir(const char *name) |
1277 | { | |
1278 | struct event_subsystem *system; | |
1279 | ||
1280 | if (strcmp(name, TRACE_SYSTEM) == 0) | |
1281 | return; | |
1282 | ||
1283 | list_for_each_entry(system, &event_subsystems, list) { | |
1284 | if (strcmp(system->name, name) == 0) { | |
1285 | if (!--system->nr_events) { | |
a2ca5e03 FW |
1286 | debugfs_remove_recursive(system->entry); |
1287 | list_del(&system->list); | |
e9dbfae5 | 1288 | __put_system(system); |
a2ca5e03 FW |
1289 | } |
1290 | break; | |
1291 | } | |
1292 | } | |
1293 | } | |
1294 | ||
4fead8e4 MH |
1295 | /* |
1296 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1297 | */ | |
bd1a5c84 MH |
1298 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1299 | { | |
8781915a | 1300 | event_remove(call); |
bd1a5c84 MH |
1301 | trace_destroy_fields(call); |
1302 | destroy_preds(call); | |
8781915a | 1303 | debugfs_remove_recursive(call->dir); |
8f082018 | 1304 | remove_subsystem_dir(call->class->system); |
bd1a5c84 MH |
1305 | } |
1306 | ||
1307 | /* Remove an event_call */ | |
1308 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1309 | { | |
1310 | mutex_lock(&event_mutex); | |
4fead8e4 | 1311 | down_write(&trace_event_mutex); |
bd1a5c84 | 1312 | __trace_remove_event_call(call); |
4fead8e4 | 1313 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1314 | mutex_unlock(&event_mutex); |
1315 | } | |
1316 | ||
1317 | #define for_each_event(event, start, end) \ | |
1318 | for (event = start; \ | |
1319 | (unsigned long)event < (unsigned long)end; \ | |
1320 | event++) | |
1321 | ||
1322 | #ifdef CONFIG_MODULES | |
1323 | ||
1324 | static LIST_HEAD(ftrace_module_file_list); | |
1325 | ||
1326 | /* | |
1327 | * Modules must own their file_operations to keep up with | |
1328 | * reference counting. | |
1329 | */ | |
1330 | struct ftrace_module_file_ops { | |
1331 | struct list_head list; | |
1332 | struct module *mod; | |
1333 | struct file_operations id; | |
1334 | struct file_operations enable; | |
1335 | struct file_operations format; | |
1336 | struct file_operations filter; | |
1337 | }; | |
1338 | ||
701970b3 SR |
1339 | static struct ftrace_module_file_ops * |
1340 | trace_create_file_ops(struct module *mod) | |
1341 | { | |
1342 | struct ftrace_module_file_ops *file_ops; | |
1343 | ||
1344 | /* | |
1345 | * This is a bit of a PITA. To allow for correct reference | |
1346 | * counting, modules must "own" their file_operations. | |
1347 | * To do this, we allocate the file operations that will be | |
1348 | * used in the event directory. | |
1349 | */ | |
1350 | ||
1351 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1352 | if (!file_ops) | |
1353 | return NULL; | |
1354 | ||
1355 | file_ops->mod = mod; | |
1356 | ||
1357 | file_ops->id = ftrace_event_id_fops; | |
1358 | file_ops->id.owner = mod; | |
1359 | ||
1360 | file_ops->enable = ftrace_enable_fops; | |
1361 | file_ops->enable.owner = mod; | |
1362 | ||
1363 | file_ops->filter = ftrace_event_filter_fops; | |
1364 | file_ops->filter.owner = mod; | |
1365 | ||
1366 | file_ops->format = ftrace_event_format_fops; | |
1367 | file_ops->format.owner = mod; | |
1368 | ||
1369 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1370 | ||
1371 | return file_ops; | |
1372 | } | |
1373 | ||
6d723736 SR |
1374 | static void trace_module_add_events(struct module *mod) |
1375 | { | |
701970b3 | 1376 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1377 | struct ftrace_event_call **call, **start, **end; |
6d723736 SR |
1378 | |
1379 | start = mod->trace_events; | |
1380 | end = mod->trace_events + mod->num_trace_events; | |
1381 | ||
1382 | if (start == end) | |
1383 | return; | |
1384 | ||
67ead0a6 LZ |
1385 | file_ops = trace_create_file_ops(mod); |
1386 | if (!file_ops) | |
6d723736 SR |
1387 | return; |
1388 | ||
1389 | for_each_event(call, start, end) { | |
e4a9ea5e | 1390 | __trace_add_event_call(*call, mod, |
88f70d75 MH |
1391 | &file_ops->id, &file_ops->enable, |
1392 | &file_ops->filter, &file_ops->format); | |
6d723736 SR |
1393 | } |
1394 | } | |
1395 | ||
1396 | static void trace_module_remove_events(struct module *mod) | |
1397 | { | |
701970b3 | 1398 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1399 | struct ftrace_event_call *call, *p; |
9456f0fa | 1400 | bool found = false; |
6d723736 | 1401 | |
110bf2b7 | 1402 | down_write(&trace_event_mutex); |
6d723736 SR |
1403 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1404 | if (call->mod == mod) { | |
9456f0fa | 1405 | found = true; |
bd1a5c84 | 1406 | __trace_remove_event_call(call); |
6d723736 SR |
1407 | } |
1408 | } | |
701970b3 SR |
1409 | |
1410 | /* Now free the file_operations */ | |
1411 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1412 | if (file_ops->mod == mod) | |
1413 | break; | |
1414 | } | |
1415 | if (&file_ops->list != &ftrace_module_file_list) { | |
1416 | list_del(&file_ops->list); | |
1417 | kfree(file_ops); | |
1418 | } | |
9456f0fa SR |
1419 | |
1420 | /* | |
1421 | * It is safest to reset the ring buffer if the module being unloaded | |
1422 | * registered any events. | |
1423 | */ | |
1424 | if (found) | |
1425 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1426 | up_write(&trace_event_mutex); |
6d723736 SR |
1427 | } |
1428 | ||
61f919a1 SR |
1429 | static int trace_module_notify(struct notifier_block *self, |
1430 | unsigned long val, void *data) | |
6d723736 SR |
1431 | { |
1432 | struct module *mod = data; | |
1433 | ||
1434 | mutex_lock(&event_mutex); | |
1435 | switch (val) { | |
1436 | case MODULE_STATE_COMING: | |
1437 | trace_module_add_events(mod); | |
1438 | break; | |
1439 | case MODULE_STATE_GOING: | |
1440 | trace_module_remove_events(mod); | |
1441 | break; | |
1442 | } | |
1443 | mutex_unlock(&event_mutex); | |
fd994989 | 1444 | |
1473e441 SR |
1445 | return 0; |
1446 | } | |
61f919a1 SR |
1447 | #else |
1448 | static int trace_module_notify(struct notifier_block *self, | |
1449 | unsigned long val, void *data) | |
1450 | { | |
1451 | return 0; | |
1452 | } | |
1453 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1454 | |
ec827c7e | 1455 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1456 | .notifier_call = trace_module_notify, |
1457 | .priority = 0, | |
1458 | }; | |
1459 | ||
e4a9ea5e SR |
1460 | extern struct ftrace_event_call *__start_ftrace_events[]; |
1461 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 1462 | |
020e5f85 LZ |
1463 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1464 | ||
1465 | static __init int setup_trace_event(char *str) | |
1466 | { | |
1467 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1468 | ring_buffer_expanded = 1; | |
1469 | tracing_selftest_disabled = 1; | |
1470 | ||
1471 | return 1; | |
1472 | } | |
1473 | __setup("trace_event=", setup_trace_event); | |
1474 | ||
8781915a EG |
1475 | static __init int event_trace_enable(void) |
1476 | { | |
1477 | struct ftrace_event_call **iter, *call; | |
1478 | char *buf = bootup_event_buf; | |
1479 | char *token; | |
1480 | int ret; | |
1481 | ||
1482 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { | |
1483 | ||
1484 | call = *iter; | |
1485 | ret = event_init(call); | |
1486 | if (!ret) | |
1487 | list_add(&call->list, &ftrace_events); | |
1488 | } | |
1489 | ||
1490 | while (true) { | |
1491 | token = strsep(&buf, ","); | |
1492 | ||
1493 | if (!token) | |
1494 | break; | |
1495 | if (!*token) | |
1496 | continue; | |
1497 | ||
1498 | ret = ftrace_set_clr_event(token, 1); | |
1499 | if (ret) | |
1500 | pr_warn("Failed to enable trace event: %s\n", token); | |
1501 | } | |
81698831 SR |
1502 | |
1503 | trace_printk_start_comm(); | |
1504 | ||
8781915a EG |
1505 | return 0; |
1506 | } | |
1507 | ||
b77e38aa SR |
1508 | static __init int event_trace_init(void) |
1509 | { | |
8781915a | 1510 | struct ftrace_event_call *call; |
b77e38aa SR |
1511 | struct dentry *d_tracer; |
1512 | struct dentry *entry; | |
1473e441 | 1513 | struct dentry *d_events; |
6d723736 | 1514 | int ret; |
b77e38aa SR |
1515 | |
1516 | d_tracer = tracing_init_dentry(); | |
1517 | if (!d_tracer) | |
1518 | return 0; | |
1519 | ||
2314c4ae | 1520 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
15075cac | 1521 | NULL, &ftrace_avail_fops); |
2314c4ae SR |
1522 | if (!entry) |
1523 | pr_warning("Could not create debugfs " | |
1524 | "'available_events' entry\n"); | |
1525 | ||
b77e38aa | 1526 | entry = debugfs_create_file("set_event", 0644, d_tracer, |
15075cac | 1527 | NULL, &ftrace_set_event_fops); |
b77e38aa SR |
1528 | if (!entry) |
1529 | pr_warning("Could not create debugfs " | |
1530 | "'set_event' entry\n"); | |
1531 | ||
1473e441 SR |
1532 | d_events = event_trace_events_dir(); |
1533 | if (!d_events) | |
1534 | return 0; | |
1535 | ||
d1b182a8 SR |
1536 | /* ring buffer internal formats */ |
1537 | trace_create_file("header_page", 0444, d_events, | |
1538 | ring_buffer_print_page_header, | |
1539 | &ftrace_show_header_fops); | |
1540 | ||
1541 | trace_create_file("header_event", 0444, d_events, | |
1542 | ring_buffer_print_entry_header, | |
1543 | &ftrace_show_header_fops); | |
1544 | ||
8ae79a13 | 1545 | trace_create_file("enable", 0644, d_events, |
8f31bfe5 | 1546 | NULL, &ftrace_system_enable_fops); |
8ae79a13 | 1547 | |
8728fe50 LZ |
1548 | if (trace_define_common_fields()) |
1549 | pr_warning("tracing: Failed to allocate common fields"); | |
1550 | ||
8781915a EG |
1551 | /* |
1552 | * Early initialization already enabled ftrace event. | |
1553 | * Now it's only necessary to create the event directory. | |
1554 | */ | |
1555 | list_for_each_entry(call, &ftrace_events, list) { | |
1556 | ||
1557 | ret = event_create_dir(call, d_events, | |
1558 | &ftrace_event_id_fops, | |
88f70d75 MH |
1559 | &ftrace_enable_fops, |
1560 | &ftrace_event_filter_fops, | |
1561 | &ftrace_event_format_fops); | |
8781915a EG |
1562 | if (ret < 0) |
1563 | event_remove(call); | |
020e5f85 LZ |
1564 | } |
1565 | ||
6d723736 | 1566 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1567 | if (ret) |
6d723736 SR |
1568 | pr_warning("Failed to register trace events module notifier\n"); |
1569 | ||
b77e38aa SR |
1570 | return 0; |
1571 | } | |
8781915a | 1572 | core_initcall(event_trace_enable); |
b77e38aa | 1573 | fs_initcall(event_trace_init); |
e6187007 SR |
1574 | |
1575 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1576 | ||
1577 | static DEFINE_SPINLOCK(test_spinlock); | |
1578 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1579 | static DEFINE_MUTEX(test_mutex); | |
1580 | ||
1581 | static __init void test_work(struct work_struct *dummy) | |
1582 | { | |
1583 | spin_lock(&test_spinlock); | |
1584 | spin_lock_irq(&test_spinlock_irq); | |
1585 | udelay(1); | |
1586 | spin_unlock_irq(&test_spinlock_irq); | |
1587 | spin_unlock(&test_spinlock); | |
1588 | ||
1589 | mutex_lock(&test_mutex); | |
1590 | msleep(1); | |
1591 | mutex_unlock(&test_mutex); | |
1592 | } | |
1593 | ||
1594 | static __init int event_test_thread(void *unused) | |
1595 | { | |
1596 | void *test_malloc; | |
1597 | ||
1598 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1599 | if (!test_malloc) | |
1600 | pr_info("failed to kmalloc\n"); | |
1601 | ||
1602 | schedule_on_each_cpu(test_work); | |
1603 | ||
1604 | kfree(test_malloc); | |
1605 | ||
1606 | set_current_state(TASK_INTERRUPTIBLE); | |
1607 | while (!kthread_should_stop()) | |
1608 | schedule(); | |
1609 | ||
1610 | return 0; | |
1611 | } | |
1612 | ||
1613 | /* | |
1614 | * Do various things that may trigger events. | |
1615 | */ | |
1616 | static __init void event_test_stuff(void) | |
1617 | { | |
1618 | struct task_struct *test_thread; | |
1619 | ||
1620 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1621 | msleep(1); | |
1622 | kthread_stop(test_thread); | |
1623 | } | |
1624 | ||
1625 | /* | |
1626 | * For every trace event defined, we will test each trace point separately, | |
1627 | * and then by groups, and finally all trace points. | |
1628 | */ | |
9ea21c1e | 1629 | static __init void event_trace_self_tests(void) |
e6187007 SR |
1630 | { |
1631 | struct ftrace_event_call *call; | |
1632 | struct event_subsystem *system; | |
e6187007 SR |
1633 | int ret; |
1634 | ||
1635 | pr_info("Running tests on trace events:\n"); | |
1636 | ||
1637 | list_for_each_entry(call, &ftrace_events, list) { | |
1638 | ||
2239291a SR |
1639 | /* Only test those that have a probe */ |
1640 | if (!call->class || !call->class->probe) | |
e6187007 SR |
1641 | continue; |
1642 | ||
1f5a6b45 SR |
1643 | /* |
1644 | * Testing syscall events here is pretty useless, but | |
1645 | * we still do it if configured. But this is time consuming. | |
1646 | * What we really need is a user thread to perform the | |
1647 | * syscalls as we test. | |
1648 | */ | |
1649 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
1650 | if (call->class->system && |
1651 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
1652 | continue; |
1653 | #endif | |
1654 | ||
e6187007 SR |
1655 | pr_info("Testing event %s: ", call->name); |
1656 | ||
1657 | /* | |
1658 | * If an event is already enabled, someone is using | |
1659 | * it and the self test should not be on. | |
1660 | */ | |
553552ce | 1661 | if (call->flags & TRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
1662 | pr_warning("Enabled event during self test!\n"); |
1663 | WARN_ON_ONCE(1); | |
1664 | continue; | |
1665 | } | |
1666 | ||
0e907c99 | 1667 | ftrace_event_enable_disable(call, 1); |
e6187007 | 1668 | event_test_stuff(); |
0e907c99 | 1669 | ftrace_event_enable_disable(call, 0); |
e6187007 SR |
1670 | |
1671 | pr_cont("OK\n"); | |
1672 | } | |
1673 | ||
1674 | /* Now test at the sub system level */ | |
1675 | ||
1676 | pr_info("Running tests on trace event systems:\n"); | |
1677 | ||
1678 | list_for_each_entry(system, &event_subsystems, list) { | |
1679 | ||
1680 | /* the ftrace system is special, skip it */ | |
1681 | if (strcmp(system->name, "ftrace") == 0) | |
1682 | continue; | |
1683 | ||
1684 | pr_info("Testing event system %s: ", system->name); | |
1685 | ||
8f31bfe5 | 1686 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 1); |
e6187007 SR |
1687 | if (WARN_ON_ONCE(ret)) { |
1688 | pr_warning("error enabling system %s\n", | |
1689 | system->name); | |
1690 | continue; | |
1691 | } | |
1692 | ||
1693 | event_test_stuff(); | |
1694 | ||
8f31bfe5 | 1695 | ret = __ftrace_set_clr_event(NULL, system->name, NULL, 0); |
76bab1b7 | 1696 | if (WARN_ON_ONCE(ret)) { |
e6187007 SR |
1697 | pr_warning("error disabling system %s\n", |
1698 | system->name); | |
76bab1b7 YL |
1699 | continue; |
1700 | } | |
e6187007 SR |
1701 | |
1702 | pr_cont("OK\n"); | |
1703 | } | |
1704 | ||
1705 | /* Test with all events enabled */ | |
1706 | ||
1707 | pr_info("Running tests on all trace events:\n"); | |
1708 | pr_info("Testing all events: "); | |
1709 | ||
8f31bfe5 | 1710 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 1); |
e6187007 | 1711 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 1712 | pr_warning("error enabling all events\n"); |
9ea21c1e | 1713 | return; |
e6187007 SR |
1714 | } |
1715 | ||
1716 | event_test_stuff(); | |
1717 | ||
1718 | /* reset sysname */ | |
8f31bfe5 | 1719 | ret = __ftrace_set_clr_event(NULL, NULL, NULL, 0); |
e6187007 SR |
1720 | if (WARN_ON_ONCE(ret)) { |
1721 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 1722 | return; |
e6187007 SR |
1723 | } |
1724 | ||
1725 | pr_cont("OK\n"); | |
9ea21c1e SR |
1726 | } |
1727 | ||
1728 | #ifdef CONFIG_FUNCTION_TRACER | |
1729 | ||
245b2e70 | 1730 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
1731 | |
1732 | static void | |
2f5f6ad9 | 1733 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 1734 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
1735 | { |
1736 | struct ring_buffer_event *event; | |
e77405ad | 1737 | struct ring_buffer *buffer; |
9ea21c1e SR |
1738 | struct ftrace_entry *entry; |
1739 | unsigned long flags; | |
1740 | long disabled; | |
9ea21c1e SR |
1741 | int cpu; |
1742 | int pc; | |
1743 | ||
1744 | pc = preempt_count(); | |
5168ae50 | 1745 | preempt_disable_notrace(); |
9ea21c1e | 1746 | cpu = raw_smp_processor_id(); |
245b2e70 | 1747 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
1748 | |
1749 | if (disabled != 1) | |
1750 | goto out; | |
1751 | ||
1752 | local_save_flags(flags); | |
1753 | ||
e77405ad SR |
1754 | event = trace_current_buffer_lock_reserve(&buffer, |
1755 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
1756 | flags, pc); |
1757 | if (!event) | |
1758 | goto out; | |
1759 | entry = ring_buffer_event_data(event); | |
1760 | entry->ip = ip; | |
1761 | entry->parent_ip = parent_ip; | |
1762 | ||
e77405ad | 1763 | trace_nowake_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
1764 | |
1765 | out: | |
245b2e70 | 1766 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 1767 | preempt_enable_notrace(); |
9ea21c1e SR |
1768 | } |
1769 | ||
1770 | static struct ftrace_ops trace_ops __initdata = | |
1771 | { | |
1772 | .func = function_test_events_call, | |
4740974a | 1773 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
1774 | }; |
1775 | ||
1776 | static __init void event_trace_self_test_with_function(void) | |
1777 | { | |
17bb615a SR |
1778 | int ret; |
1779 | ret = register_ftrace_function(&trace_ops); | |
1780 | if (WARN_ON(ret < 0)) { | |
1781 | pr_info("Failed to enable function tracer for event tests\n"); | |
1782 | return; | |
1783 | } | |
9ea21c1e SR |
1784 | pr_info("Running tests again, along with the function tracer\n"); |
1785 | event_trace_self_tests(); | |
1786 | unregister_ftrace_function(&trace_ops); | |
1787 | } | |
1788 | #else | |
1789 | static __init void event_trace_self_test_with_function(void) | |
1790 | { | |
1791 | } | |
1792 | #endif | |
1793 | ||
1794 | static __init int event_trace_self_tests_init(void) | |
1795 | { | |
020e5f85 LZ |
1796 | if (!tracing_selftest_disabled) { |
1797 | event_trace_self_tests(); | |
1798 | event_trace_self_test_with_function(); | |
1799 | } | |
e6187007 SR |
1800 | |
1801 | return 0; | |
1802 | } | |
1803 | ||
28d20e2d | 1804 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
1805 | |
1806 | #endif |