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 | |
ae63b31e SR |
39 | /* Double loops, do not use break, only goto's work */ |
40 | #define do_for_each_event_file(tr, file) \ | |
41 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
42 | list_for_each_entry(file, &tr->events, list) | |
43 | ||
44 | #define do_for_each_event_file_safe(tr, file) \ | |
45 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
46 | struct ftrace_event_file *___n; \ | |
47 | list_for_each_entry_safe(file, ___n, &tr->events, list) | |
48 | ||
49 | #define while_for_each_event_file() \ | |
50 | } | |
51 | ||
2e33af02 SR |
52 | struct list_head * |
53 | trace_get_fields(struct ftrace_event_call *event_call) | |
54 | { | |
55 | if (!event_call->class->get_fields) | |
56 | return &event_call->class->fields; | |
57 | return event_call->class->get_fields(event_call); | |
58 | } | |
59 | ||
8728fe50 LZ |
60 | static int __trace_define_field(struct list_head *head, const char *type, |
61 | const char *name, int offset, int size, | |
62 | int is_signed, int filter_type) | |
cf027f64 TZ |
63 | { |
64 | struct ftrace_event_field *field; | |
65 | ||
fe9f57f2 | 66 | field = kzalloc(sizeof(*field), GFP_KERNEL); |
cf027f64 TZ |
67 | if (!field) |
68 | goto err; | |
fe9f57f2 | 69 | |
cf027f64 TZ |
70 | field->name = kstrdup(name, GFP_KERNEL); |
71 | if (!field->name) | |
72 | goto err; | |
fe9f57f2 | 73 | |
cf027f64 TZ |
74 | field->type = kstrdup(type, GFP_KERNEL); |
75 | if (!field->type) | |
76 | goto err; | |
fe9f57f2 | 77 | |
43b51ead LZ |
78 | if (filter_type == FILTER_OTHER) |
79 | field->filter_type = filter_assign_type(type); | |
80 | else | |
81 | field->filter_type = filter_type; | |
82 | ||
cf027f64 TZ |
83 | field->offset = offset; |
84 | field->size = size; | |
a118e4d1 | 85 | field->is_signed = is_signed; |
aa38e9fc | 86 | |
2e33af02 | 87 | list_add(&field->link, head); |
cf027f64 TZ |
88 | |
89 | return 0; | |
fe9f57f2 | 90 | |
cf027f64 | 91 | err: |
7b60997f | 92 | if (field) |
cf027f64 | 93 | kfree(field->name); |
cf027f64 | 94 | kfree(field); |
fe9f57f2 | 95 | |
cf027f64 TZ |
96 | return -ENOMEM; |
97 | } | |
8728fe50 LZ |
98 | |
99 | int trace_define_field(struct ftrace_event_call *call, const char *type, | |
100 | const char *name, int offset, int size, int is_signed, | |
101 | int filter_type) | |
102 | { | |
103 | struct list_head *head; | |
104 | ||
105 | if (WARN_ON(!call->class)) | |
106 | return 0; | |
107 | ||
108 | head = trace_get_fields(call); | |
109 | return __trace_define_field(head, type, name, offset, size, | |
110 | is_signed, filter_type); | |
111 | } | |
17c873ec | 112 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 113 | |
e647d6b3 | 114 | #define __common_field(type, item) \ |
8728fe50 LZ |
115 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
116 | "common_" #item, \ | |
117 | offsetof(typeof(ent), item), \ | |
118 | sizeof(ent.item), \ | |
119 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
120 | if (ret) \ |
121 | return ret; | |
122 | ||
8728fe50 | 123 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
124 | { |
125 | int ret; | |
126 | struct trace_entry ent; | |
127 | ||
128 | __common_field(unsigned short, type); | |
129 | __common_field(unsigned char, flags); | |
130 | __common_field(unsigned char, preempt_count); | |
131 | __common_field(int, pid); | |
e647d6b3 LZ |
132 | |
133 | return ret; | |
134 | } | |
135 | ||
bd1a5c84 | 136 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
137 | { |
138 | struct ftrace_event_field *field, *next; | |
2e33af02 | 139 | struct list_head *head; |
2df75e41 | 140 | |
2e33af02 SR |
141 | head = trace_get_fields(call); |
142 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 LZ |
143 | list_del(&field->link); |
144 | kfree(field->type); | |
145 | kfree(field->name); | |
146 | kfree(field); | |
147 | } | |
148 | } | |
149 | ||
87d9b4e1 LZ |
150 | int trace_event_raw_init(struct ftrace_event_call *call) |
151 | { | |
152 | int id; | |
153 | ||
80decc70 | 154 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
155 | if (!id) |
156 | return -ENODEV; | |
87d9b4e1 LZ |
157 | |
158 | return 0; | |
159 | } | |
160 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
161 | ||
ceec0b6f JO |
162 | int ftrace_event_reg(struct ftrace_event_call *call, |
163 | enum trace_reg type, void *data) | |
a1d0ce82 | 164 | { |
ae63b31e SR |
165 | struct ftrace_event_file *file = data; |
166 | ||
a1d0ce82 SR |
167 | switch (type) { |
168 | case TRACE_REG_REGISTER: | |
169 | return tracepoint_probe_register(call->name, | |
170 | call->class->probe, | |
ae63b31e | 171 | file); |
a1d0ce82 SR |
172 | case TRACE_REG_UNREGISTER: |
173 | tracepoint_probe_unregister(call->name, | |
174 | call->class->probe, | |
ae63b31e | 175 | file); |
a1d0ce82 SR |
176 | return 0; |
177 | ||
178 | #ifdef CONFIG_PERF_EVENTS | |
179 | case TRACE_REG_PERF_REGISTER: | |
180 | return tracepoint_probe_register(call->name, | |
181 | call->class->perf_probe, | |
182 | call); | |
183 | case TRACE_REG_PERF_UNREGISTER: | |
184 | tracepoint_probe_unregister(call->name, | |
185 | call->class->perf_probe, | |
186 | call); | |
187 | return 0; | |
ceec0b6f JO |
188 | case TRACE_REG_PERF_OPEN: |
189 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
190 | case TRACE_REG_PERF_ADD: |
191 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 192 | return 0; |
a1d0ce82 SR |
193 | #endif |
194 | } | |
195 | return 0; | |
196 | } | |
197 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
198 | ||
e870e9a1 LZ |
199 | void trace_event_enable_cmd_record(bool enable) |
200 | { | |
ae63b31e SR |
201 | struct ftrace_event_file *file; |
202 | struct trace_array *tr; | |
e870e9a1 LZ |
203 | |
204 | mutex_lock(&event_mutex); | |
ae63b31e SR |
205 | do_for_each_event_file(tr, file) { |
206 | ||
207 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) | |
e870e9a1 LZ |
208 | continue; |
209 | ||
210 | if (enable) { | |
211 | tracing_start_cmdline_record(); | |
ae63b31e | 212 | file->flags |= FTRACE_EVENT_FL_RECORDED_CMD; |
e870e9a1 LZ |
213 | } else { |
214 | tracing_stop_cmdline_record(); | |
ae63b31e | 215 | file->flags &= ~FTRACE_EVENT_FL_RECORDED_CMD; |
e870e9a1 | 216 | } |
ae63b31e | 217 | } while_for_each_event_file(); |
e870e9a1 LZ |
218 | mutex_unlock(&event_mutex); |
219 | } | |
220 | ||
ae63b31e SR |
221 | static int ftrace_event_enable_disable(struct ftrace_event_file *file, |
222 | int enable) | |
fd994989 | 223 | { |
ae63b31e | 224 | struct ftrace_event_call *call = file->event_call; |
3b8e4273 LZ |
225 | int ret = 0; |
226 | ||
fd994989 SR |
227 | switch (enable) { |
228 | case 0: | |
ae63b31e SR |
229 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
230 | file->flags &= ~FTRACE_EVENT_FL_ENABLED; | |
231 | if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) { | |
e870e9a1 | 232 | tracing_stop_cmdline_record(); |
ae63b31e | 233 | file->flags &= ~FTRACE_EVENT_FL_RECORDED_CMD; |
e870e9a1 | 234 | } |
ae63b31e | 235 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 236 | } |
fd994989 SR |
237 | break; |
238 | case 1: | |
ae63b31e | 239 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) { |
e870e9a1 LZ |
240 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
241 | tracing_start_cmdline_record(); | |
ae63b31e | 242 | file->flags |= FTRACE_EVENT_FL_RECORDED_CMD; |
e870e9a1 | 243 | } |
ae63b31e | 244 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
245 | if (ret) { |
246 | tracing_stop_cmdline_record(); | |
247 | pr_info("event trace: Could not enable event " | |
248 | "%s\n", call->name); | |
249 | break; | |
250 | } | |
ae63b31e | 251 | file->flags |= FTRACE_EVENT_FL_ENABLED; |
fd994989 | 252 | } |
fd994989 SR |
253 | break; |
254 | } | |
3b8e4273 LZ |
255 | |
256 | return ret; | |
fd994989 SR |
257 | } |
258 | ||
ae63b31e | 259 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 260 | { |
ae63b31e | 261 | struct ftrace_event_file *file; |
0e907c99 Z |
262 | |
263 | mutex_lock(&event_mutex); | |
ae63b31e SR |
264 | list_for_each_entry(file, &tr->events, list) { |
265 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
266 | } |
267 | mutex_unlock(&event_mutex); | |
268 | } | |
269 | ||
e9dbfae5 SR |
270 | static void __put_system(struct event_subsystem *system) |
271 | { | |
272 | struct event_filter *filter = system->filter; | |
273 | ||
274 | WARN_ON_ONCE(system->ref_count == 0); | |
275 | if (--system->ref_count) | |
276 | return; | |
277 | ||
ae63b31e SR |
278 | list_del(&system->list); |
279 | ||
e9dbfae5 SR |
280 | if (filter) { |
281 | kfree(filter->filter_string); | |
282 | kfree(filter); | |
283 | } | |
284 | kfree(system->name); | |
285 | kfree(system); | |
286 | } | |
287 | ||
288 | static void __get_system(struct event_subsystem *system) | |
289 | { | |
290 | WARN_ON_ONCE(system->ref_count == 0); | |
291 | system->ref_count++; | |
292 | } | |
293 | ||
ae63b31e SR |
294 | static void __get_system_dir(struct ftrace_subsystem_dir *dir) |
295 | { | |
296 | WARN_ON_ONCE(dir->ref_count == 0); | |
297 | dir->ref_count++; | |
298 | __get_system(dir->subsystem); | |
299 | } | |
300 | ||
301 | static void __put_system_dir(struct ftrace_subsystem_dir *dir) | |
302 | { | |
303 | WARN_ON_ONCE(dir->ref_count == 0); | |
304 | /* If the subsystem is about to be freed, the dir must be too */ | |
305 | WARN_ON_ONCE(dir->subsystem->ref_count == 1 && dir->ref_count != 1); | |
306 | ||
307 | __put_system(dir->subsystem); | |
308 | if (!--dir->ref_count) | |
309 | kfree(dir); | |
310 | } | |
311 | ||
312 | static void put_system(struct ftrace_subsystem_dir *dir) | |
e9dbfae5 SR |
313 | { |
314 | mutex_lock(&event_mutex); | |
ae63b31e | 315 | __put_system_dir(dir); |
e9dbfae5 SR |
316 | mutex_unlock(&event_mutex); |
317 | } | |
318 | ||
8f31bfe5 LZ |
319 | /* |
320 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
321 | */ | |
ae63b31e SR |
322 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, |
323 | const char *sub, const char *event, int set) | |
b77e38aa | 324 | { |
ae63b31e | 325 | struct ftrace_event_file *file; |
a59fd602 | 326 | struct ftrace_event_call *call; |
29f93943 | 327 | int ret = -EINVAL; |
8f31bfe5 LZ |
328 | |
329 | mutex_lock(&event_mutex); | |
ae63b31e SR |
330 | list_for_each_entry(file, &tr->events, list) { |
331 | ||
332 | call = file->event_call; | |
8f31bfe5 | 333 | |
a1d0ce82 | 334 | if (!call->name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
335 | continue; |
336 | ||
9b63776f SR |
337 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
338 | continue; | |
339 | ||
8f31bfe5 LZ |
340 | if (match && |
341 | strcmp(match, call->name) != 0 && | |
8f082018 | 342 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
343 | continue; |
344 | ||
8f082018 | 345 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
346 | continue; |
347 | ||
348 | if (event && strcmp(event, call->name) != 0) | |
349 | continue; | |
350 | ||
ae63b31e | 351 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
352 | |
353 | ret = 0; | |
354 | } | |
355 | mutex_unlock(&event_mutex); | |
356 | ||
357 | return ret; | |
358 | } | |
359 | ||
ae63b31e | 360 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 361 | { |
b628b3e6 | 362 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
363 | |
364 | /* | |
365 | * The buf format can be <subsystem>:<event-name> | |
366 | * *:<event-name> means any event by that name. | |
367 | * :<event-name> is the same. | |
368 | * | |
369 | * <subsystem>:* means all events in that subsystem | |
370 | * <subsystem>: means the same. | |
371 | * | |
372 | * <name> (no ':') means all events in a subsystem with | |
373 | * the name <name> or any event that matches <name> | |
374 | */ | |
375 | ||
376 | match = strsep(&buf, ":"); | |
377 | if (buf) { | |
378 | sub = match; | |
379 | event = buf; | |
380 | match = NULL; | |
381 | ||
382 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
383 | sub = NULL; | |
384 | if (!strlen(event) || strcmp(event, "*") == 0) | |
385 | event = NULL; | |
386 | } | |
b77e38aa | 387 | |
ae63b31e | 388 | return __ftrace_set_clr_event(tr, match, sub, event, set); |
b77e38aa SR |
389 | } |
390 | ||
4671c794 SR |
391 | /** |
392 | * trace_set_clr_event - enable or disable an event | |
393 | * @system: system name to match (NULL for any system) | |
394 | * @event: event name to match (NULL for all events, within system) | |
395 | * @set: 1 to enable, 0 to disable | |
396 | * | |
397 | * This is a way for other parts of the kernel to enable or disable | |
398 | * event recording. | |
399 | * | |
400 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
401 | * registered events. | |
402 | */ | |
403 | int trace_set_clr_event(const char *system, const char *event, int set) | |
404 | { | |
ae63b31e SR |
405 | struct trace_array *tr = top_trace_array(); |
406 | ||
407 | return __ftrace_set_clr_event(tr, NULL, system, event, set); | |
4671c794 | 408 | } |
56355b83 | 409 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 410 | |
b77e38aa SR |
411 | /* 128 should be much more than enough */ |
412 | #define EVENT_BUF_SIZE 127 | |
413 | ||
414 | static ssize_t | |
415 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
416 | size_t cnt, loff_t *ppos) | |
417 | { | |
48966364 | 418 | struct trace_parser parser; |
ae63b31e SR |
419 | struct seq_file *m = file->private_data; |
420 | struct trace_array *tr = m->private; | |
4ba7978e | 421 | ssize_t read, ret; |
b77e38aa | 422 | |
4ba7978e | 423 | if (!cnt) |
b77e38aa SR |
424 | return 0; |
425 | ||
1852fcce SR |
426 | ret = tracing_update_buffers(); |
427 | if (ret < 0) | |
428 | return ret; | |
429 | ||
48966364 | 430 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
431 | return -ENOMEM; |
432 | ||
48966364 | 433 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
434 | ||
4ba7978e | 435 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 436 | int set = 1; |
b77e38aa | 437 | |
48966364 | 438 | if (*parser.buffer == '!') |
b77e38aa | 439 | set = 0; |
b77e38aa | 440 | |
48966364 | 441 | parser.buffer[parser.idx] = 0; |
442 | ||
ae63b31e | 443 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 444 | if (ret) |
48966364 | 445 | goto out_put; |
b77e38aa | 446 | } |
b77e38aa SR |
447 | |
448 | ret = read; | |
449 | ||
48966364 | 450 | out_put: |
451 | trace_parser_put(&parser); | |
b77e38aa SR |
452 | |
453 | return ret; | |
454 | } | |
455 | ||
456 | static void * | |
457 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
458 | { | |
ae63b31e SR |
459 | struct ftrace_event_file *file = v; |
460 | struct ftrace_event_call *call; | |
461 | struct trace_array *tr = m->private; | |
b77e38aa SR |
462 | |
463 | (*pos)++; | |
464 | ||
ae63b31e SR |
465 | list_for_each_entry_continue(file, &tr->events, list) { |
466 | call = file->event_call; | |
40e26815 SR |
467 | /* |
468 | * The ftrace subsystem is for showing formats only. | |
469 | * They can not be enabled or disabled via the event files. | |
470 | */ | |
a1d0ce82 | 471 | if (call->class && call->class->reg) |
ae63b31e | 472 | return file; |
40e26815 | 473 | } |
b77e38aa | 474 | |
30bd39cd | 475 | return NULL; |
b77e38aa SR |
476 | } |
477 | ||
478 | static void *t_start(struct seq_file *m, loff_t *pos) | |
479 | { | |
ae63b31e SR |
480 | struct ftrace_event_file *file; |
481 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
482 | loff_t l; |
483 | ||
20c8928a | 484 | mutex_lock(&event_mutex); |
e1c7e2a6 | 485 | |
ae63b31e | 486 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 487 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
488 | file = t_next(m, file, &l); |
489 | if (!file) | |
e1c7e2a6 LZ |
490 | break; |
491 | } | |
ae63b31e | 492 | return file; |
b77e38aa SR |
493 | } |
494 | ||
495 | static void * | |
496 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
497 | { | |
ae63b31e SR |
498 | struct ftrace_event_file *file = v; |
499 | struct trace_array *tr = m->private; | |
b77e38aa SR |
500 | |
501 | (*pos)++; | |
502 | ||
ae63b31e SR |
503 | list_for_each_entry_continue(file, &tr->events, list) { |
504 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
505 | return file; | |
b77e38aa SR |
506 | } |
507 | ||
30bd39cd | 508 | return NULL; |
b77e38aa SR |
509 | } |
510 | ||
511 | static void *s_start(struct seq_file *m, loff_t *pos) | |
512 | { | |
ae63b31e SR |
513 | struct ftrace_event_file *file; |
514 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
515 | loff_t l; |
516 | ||
20c8928a | 517 | mutex_lock(&event_mutex); |
e1c7e2a6 | 518 | |
ae63b31e | 519 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 520 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
521 | file = s_next(m, file, &l); |
522 | if (!file) | |
e1c7e2a6 LZ |
523 | break; |
524 | } | |
ae63b31e | 525 | return file; |
b77e38aa SR |
526 | } |
527 | ||
528 | static int t_show(struct seq_file *m, void *v) | |
529 | { | |
ae63b31e SR |
530 | struct ftrace_event_file *file = v; |
531 | struct ftrace_event_call *call = file->event_call; | |
b77e38aa | 532 | |
8f082018 SR |
533 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
534 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
535 | seq_printf(m, "%s\n", call->name); |
536 | ||
537 | return 0; | |
538 | } | |
539 | ||
540 | static void t_stop(struct seq_file *m, void *p) | |
541 | { | |
20c8928a | 542 | mutex_unlock(&event_mutex); |
b77e38aa SR |
543 | } |
544 | ||
1473e441 SR |
545 | static ssize_t |
546 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
547 | loff_t *ppos) | |
548 | { | |
ae63b31e | 549 | struct ftrace_event_file *file = filp->private_data; |
1473e441 SR |
550 | char *buf; |
551 | ||
ae63b31e | 552 | if (file->flags & FTRACE_EVENT_FL_ENABLED) |
1473e441 SR |
553 | buf = "1\n"; |
554 | else | |
555 | buf = "0\n"; | |
556 | ||
557 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
558 | } | |
559 | ||
560 | static ssize_t | |
561 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
562 | loff_t *ppos) | |
563 | { | |
ae63b31e | 564 | struct ftrace_event_file *file = filp->private_data; |
1473e441 SR |
565 | unsigned long val; |
566 | int ret; | |
567 | ||
ae63b31e SR |
568 | if (!file) |
569 | return -EINVAL; | |
570 | ||
22fe9b54 PH |
571 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
572 | if (ret) | |
1473e441 SR |
573 | return ret; |
574 | ||
1852fcce SR |
575 | ret = tracing_update_buffers(); |
576 | if (ret < 0) | |
577 | return ret; | |
578 | ||
1473e441 SR |
579 | switch (val) { |
580 | case 0: | |
1473e441 | 581 | case 1: |
11a241a3 | 582 | mutex_lock(&event_mutex); |
ae63b31e | 583 | ret = ftrace_event_enable_disable(file, val); |
11a241a3 | 584 | mutex_unlock(&event_mutex); |
1473e441 SR |
585 | break; |
586 | ||
587 | default: | |
588 | return -EINVAL; | |
589 | } | |
590 | ||
591 | *ppos += cnt; | |
592 | ||
3b8e4273 | 593 | return ret ? ret : cnt; |
1473e441 SR |
594 | } |
595 | ||
8ae79a13 SR |
596 | static ssize_t |
597 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
598 | loff_t *ppos) | |
599 | { | |
c142b15d | 600 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
ae63b31e SR |
601 | struct ftrace_subsystem_dir *dir = filp->private_data; |
602 | struct event_subsystem *system = dir->subsystem; | |
8ae79a13 | 603 | struct ftrace_event_call *call; |
ae63b31e SR |
604 | struct ftrace_event_file *file; |
605 | struct trace_array *tr = dir->tr; | |
8ae79a13 | 606 | char buf[2]; |
c142b15d | 607 | int set = 0; |
8ae79a13 SR |
608 | int ret; |
609 | ||
8ae79a13 | 610 | mutex_lock(&event_mutex); |
ae63b31e SR |
611 | list_for_each_entry(file, &tr->events, list) { |
612 | call = file->event_call; | |
a1d0ce82 | 613 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
614 | continue; |
615 | ||
40ee4dff | 616 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
617 | continue; |
618 | ||
619 | /* | |
620 | * We need to find out if all the events are set | |
621 | * or if all events or cleared, or if we have | |
622 | * a mixture. | |
623 | */ | |
ae63b31e | 624 | set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED)); |
c142b15d | 625 | |
8ae79a13 SR |
626 | /* |
627 | * If we have a mixture, no need to look further. | |
628 | */ | |
c142b15d | 629 | if (set == 3) |
8ae79a13 SR |
630 | break; |
631 | } | |
632 | mutex_unlock(&event_mutex); | |
633 | ||
c142b15d | 634 | buf[0] = set_to_char[set]; |
8ae79a13 | 635 | buf[1] = '\n'; |
8ae79a13 SR |
636 | |
637 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
638 | ||
639 | return ret; | |
640 | } | |
641 | ||
642 | static ssize_t | |
643 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
644 | loff_t *ppos) | |
645 | { | |
ae63b31e SR |
646 | struct ftrace_subsystem_dir *dir = filp->private_data; |
647 | struct event_subsystem *system = dir->subsystem; | |
40ee4dff | 648 | const char *name = NULL; |
8ae79a13 | 649 | unsigned long val; |
8ae79a13 SR |
650 | ssize_t ret; |
651 | ||
22fe9b54 PH |
652 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
653 | if (ret) | |
8ae79a13 SR |
654 | return ret; |
655 | ||
656 | ret = tracing_update_buffers(); | |
657 | if (ret < 0) | |
658 | return ret; | |
659 | ||
8f31bfe5 | 660 | if (val != 0 && val != 1) |
8ae79a13 | 661 | return -EINVAL; |
8ae79a13 | 662 | |
40ee4dff SR |
663 | /* |
664 | * Opening of "enable" adds a ref count to system, | |
665 | * so the name is safe to use. | |
666 | */ | |
667 | if (system) | |
668 | name = system->name; | |
669 | ||
ae63b31e | 670 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 671 | if (ret) |
8f31bfe5 | 672 | goto out; |
8ae79a13 SR |
673 | |
674 | ret = cnt; | |
675 | ||
8f31bfe5 | 676 | out: |
8ae79a13 SR |
677 | *ppos += cnt; |
678 | ||
679 | return ret; | |
680 | } | |
681 | ||
2a37a3df SR |
682 | enum { |
683 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
684 | FORMAT_FIELD_SEPERATOR = 2, |
685 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
686 | }; |
687 | ||
688 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 689 | { |
2a37a3df | 690 | struct ftrace_event_call *call = m->private; |
5a65e956 | 691 | struct ftrace_event_field *field; |
86397dc3 LZ |
692 | struct list_head *common_head = &ftrace_common_fields; |
693 | struct list_head *head = trace_get_fields(call); | |
981d081e | 694 | |
2a37a3df | 695 | (*pos)++; |
5a65e956 | 696 | |
2a37a3df SR |
697 | switch ((unsigned long)v) { |
698 | case FORMAT_HEADER: | |
86397dc3 LZ |
699 | if (unlikely(list_empty(common_head))) |
700 | return NULL; | |
701 | ||
702 | field = list_entry(common_head->prev, | |
703 | struct ftrace_event_field, link); | |
704 | return field; | |
5a65e956 | 705 | |
86397dc3 | 706 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
707 | if (unlikely(list_empty(head))) |
708 | return NULL; | |
5a65e956 | 709 | |
2a37a3df SR |
710 | field = list_entry(head->prev, struct ftrace_event_field, link); |
711 | return field; | |
5a65e956 | 712 | |
2a37a3df SR |
713 | case FORMAT_PRINTFMT: |
714 | /* all done */ | |
715 | return NULL; | |
5a65e956 LJ |
716 | } |
717 | ||
2a37a3df | 718 | field = v; |
86397dc3 LZ |
719 | if (field->link.prev == common_head) |
720 | return (void *)FORMAT_FIELD_SEPERATOR; | |
721 | else if (field->link.prev == head) | |
2a37a3df SR |
722 | return (void *)FORMAT_PRINTFMT; |
723 | ||
724 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
725 | ||
2a37a3df | 726 | return field; |
8728fe50 | 727 | } |
5a65e956 | 728 | |
2a37a3df | 729 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 730 | { |
2a37a3df SR |
731 | loff_t l = 0; |
732 | void *p; | |
5a65e956 | 733 | |
2a37a3df SR |
734 | /* Start by showing the header */ |
735 | if (!*pos) | |
736 | return (void *)FORMAT_HEADER; | |
737 | ||
738 | p = (void *)FORMAT_HEADER; | |
739 | do { | |
740 | p = f_next(m, p, &l); | |
741 | } while (p && l < *pos); | |
742 | ||
743 | return p; | |
744 | } | |
745 | ||
746 | static int f_show(struct seq_file *m, void *v) | |
747 | { | |
748 | struct ftrace_event_call *call = m->private; | |
749 | struct ftrace_event_field *field; | |
750 | const char *array_descriptor; | |
751 | ||
752 | switch ((unsigned long)v) { | |
753 | case FORMAT_HEADER: | |
754 | seq_printf(m, "name: %s\n", call->name); | |
755 | seq_printf(m, "ID: %d\n", call->event.type); | |
756 | seq_printf(m, "format:\n"); | |
8728fe50 | 757 | return 0; |
5a65e956 | 758 | |
86397dc3 LZ |
759 | case FORMAT_FIELD_SEPERATOR: |
760 | seq_putc(m, '\n'); | |
761 | return 0; | |
762 | ||
2a37a3df SR |
763 | case FORMAT_PRINTFMT: |
764 | seq_printf(m, "\nprint fmt: %s\n", | |
765 | call->print_fmt); | |
766 | return 0; | |
981d081e | 767 | } |
8728fe50 | 768 | |
2a37a3df | 769 | field = v; |
8728fe50 | 770 | |
2a37a3df SR |
771 | /* |
772 | * Smartly shows the array type(except dynamic array). | |
773 | * Normal: | |
774 | * field:TYPE VAR | |
775 | * If TYPE := TYPE[LEN], it is shown: | |
776 | * field:TYPE VAR[LEN] | |
777 | */ | |
778 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 779 | |
2a37a3df SR |
780 | if (!strncmp(field->type, "__data_loc", 10)) |
781 | array_descriptor = NULL; | |
8728fe50 | 782 | |
2a37a3df SR |
783 | if (!array_descriptor) |
784 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
785 | field->type, field->name, field->offset, | |
786 | field->size, !!field->is_signed); | |
787 | else | |
788 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
789 | (int)(array_descriptor - field->type), | |
790 | field->type, field->name, | |
791 | array_descriptor, field->offset, | |
792 | field->size, !!field->is_signed); | |
8728fe50 | 793 | |
2a37a3df SR |
794 | return 0; |
795 | } | |
5a65e956 | 796 | |
2a37a3df SR |
797 | static void f_stop(struct seq_file *m, void *p) |
798 | { | |
799 | } | |
981d081e | 800 | |
2a37a3df SR |
801 | static const struct seq_operations trace_format_seq_ops = { |
802 | .start = f_start, | |
803 | .next = f_next, | |
804 | .stop = f_stop, | |
805 | .show = f_show, | |
806 | }; | |
807 | ||
808 | static int trace_format_open(struct inode *inode, struct file *file) | |
809 | { | |
810 | struct ftrace_event_call *call = inode->i_private; | |
811 | struct seq_file *m; | |
812 | int ret; | |
813 | ||
814 | ret = seq_open(file, &trace_format_seq_ops); | |
815 | if (ret < 0) | |
816 | return ret; | |
817 | ||
818 | m = file->private_data; | |
819 | m->private = call; | |
820 | ||
821 | return 0; | |
981d081e SR |
822 | } |
823 | ||
23725aee PZ |
824 | static ssize_t |
825 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
826 | { | |
827 | struct ftrace_event_call *call = filp->private_data; | |
828 | struct trace_seq *s; | |
829 | int r; | |
830 | ||
831 | if (*ppos) | |
832 | return 0; | |
833 | ||
834 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
835 | if (!s) | |
836 | return -ENOMEM; | |
837 | ||
838 | trace_seq_init(s); | |
32c0edae | 839 | trace_seq_printf(s, "%d\n", call->event.type); |
23725aee PZ |
840 | |
841 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
842 | s->buffer, s->len); | |
843 | kfree(s); | |
844 | return r; | |
845 | } | |
846 | ||
7ce7e424 TZ |
847 | static ssize_t |
848 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
849 | loff_t *ppos) | |
850 | { | |
851 | struct ftrace_event_call *call = filp->private_data; | |
852 | struct trace_seq *s; | |
853 | int r; | |
854 | ||
855 | if (*ppos) | |
856 | return 0; | |
857 | ||
858 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
859 | if (!s) | |
860 | return -ENOMEM; | |
861 | ||
862 | trace_seq_init(s); | |
863 | ||
8b372562 | 864 | print_event_filter(call, s); |
4bda2d51 | 865 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
866 | |
867 | kfree(s); | |
868 | ||
869 | return r; | |
870 | } | |
871 | ||
872 | static ssize_t | |
873 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
874 | loff_t *ppos) | |
875 | { | |
876 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 877 | char *buf; |
7ce7e424 TZ |
878 | int err; |
879 | ||
8b372562 | 880 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
881 | return -EINVAL; |
882 | ||
8b372562 TZ |
883 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
884 | if (!buf) | |
7ce7e424 TZ |
885 | return -ENOMEM; |
886 | ||
8b372562 TZ |
887 | if (copy_from_user(buf, ubuf, cnt)) { |
888 | free_page((unsigned long) buf); | |
889 | return -EFAULT; | |
7ce7e424 | 890 | } |
8b372562 | 891 | buf[cnt] = '\0'; |
7ce7e424 | 892 | |
8b372562 TZ |
893 | err = apply_event_filter(call, buf); |
894 | free_page((unsigned long) buf); | |
895 | if (err < 0) | |
44e9c8b7 | 896 | return err; |
0a19e53c | 897 | |
7ce7e424 TZ |
898 | *ppos += cnt; |
899 | ||
900 | return cnt; | |
901 | } | |
902 | ||
e9dbfae5 SR |
903 | static LIST_HEAD(event_subsystems); |
904 | ||
905 | static int subsystem_open(struct inode *inode, struct file *filp) | |
906 | { | |
907 | struct event_subsystem *system = NULL; | |
ae63b31e SR |
908 | struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
909 | struct trace_array *tr; | |
e9dbfae5 SR |
910 | int ret; |
911 | ||
912 | /* Make sure the system still exists */ | |
913 | mutex_lock(&event_mutex); | |
ae63b31e SR |
914 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
915 | list_for_each_entry(dir, &tr->systems, list) { | |
916 | if (dir == inode->i_private) { | |
917 | /* Don't open systems with no events */ | |
918 | if (dir->nr_events) { | |
919 | __get_system_dir(dir); | |
920 | system = dir->subsystem; | |
921 | } | |
922 | goto exit_loop; | |
e9dbfae5 | 923 | } |
e9dbfae5 SR |
924 | } |
925 | } | |
ae63b31e | 926 | exit_loop: |
e9dbfae5 SR |
927 | mutex_unlock(&event_mutex); |
928 | ||
ae63b31e | 929 | if (!system) |
e9dbfae5 SR |
930 | return -ENODEV; |
931 | ||
ae63b31e SR |
932 | /* Some versions of gcc think dir can be uninitialized here */ |
933 | WARN_ON(!dir); | |
934 | ||
e9dbfae5 | 935 | ret = tracing_open_generic(inode, filp); |
ae63b31e SR |
936 | if (ret < 0) |
937 | put_system(dir); | |
938 | ||
939 | return ret; | |
940 | } | |
941 | ||
942 | static int system_tr_open(struct inode *inode, struct file *filp) | |
943 | { | |
944 | struct ftrace_subsystem_dir *dir; | |
945 | struct trace_array *tr = inode->i_private; | |
946 | int ret; | |
947 | ||
948 | /* Make a temporary dir that has no system but points to tr */ | |
949 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
950 | if (!dir) | |
951 | return -ENOMEM; | |
952 | ||
953 | dir->tr = tr; | |
954 | ||
955 | ret = tracing_open_generic(inode, filp); | |
956 | if (ret < 0) | |
957 | kfree(dir); | |
958 | ||
959 | filp->private_data = dir; | |
e9dbfae5 SR |
960 | |
961 | return ret; | |
962 | } | |
963 | ||
964 | static int subsystem_release(struct inode *inode, struct file *file) | |
965 | { | |
ae63b31e | 966 | struct ftrace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 967 | |
ae63b31e SR |
968 | /* |
969 | * If dir->subsystem is NULL, then this is a temporary | |
970 | * descriptor that was made for a trace_array to enable | |
971 | * all subsystems. | |
972 | */ | |
973 | if (dir->subsystem) | |
974 | put_system(dir); | |
975 | else | |
976 | kfree(dir); | |
e9dbfae5 SR |
977 | |
978 | return 0; | |
979 | } | |
980 | ||
cfb180f3 TZ |
981 | static ssize_t |
982 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
983 | loff_t *ppos) | |
984 | { | |
ae63b31e SR |
985 | struct ftrace_subsystem_dir *dir = filp->private_data; |
986 | struct event_subsystem *system = dir->subsystem; | |
cfb180f3 TZ |
987 | struct trace_seq *s; |
988 | int r; | |
989 | ||
990 | if (*ppos) | |
991 | return 0; | |
992 | ||
993 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
994 | if (!s) | |
995 | return -ENOMEM; | |
996 | ||
997 | trace_seq_init(s); | |
998 | ||
8b372562 | 999 | print_subsystem_event_filter(system, s); |
4bda2d51 | 1000 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
1001 | |
1002 | kfree(s); | |
1003 | ||
1004 | return r; | |
1005 | } | |
1006 | ||
1007 | static ssize_t | |
1008 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1009 | loff_t *ppos) | |
1010 | { | |
ae63b31e | 1011 | struct ftrace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1012 | char *buf; |
cfb180f3 TZ |
1013 | int err; |
1014 | ||
8b372562 | 1015 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1016 | return -EINVAL; |
1017 | ||
8b372562 TZ |
1018 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1019 | if (!buf) | |
cfb180f3 TZ |
1020 | return -ENOMEM; |
1021 | ||
8b372562 TZ |
1022 | if (copy_from_user(buf, ubuf, cnt)) { |
1023 | free_page((unsigned long) buf); | |
1024 | return -EFAULT; | |
cfb180f3 | 1025 | } |
8b372562 | 1026 | buf[cnt] = '\0'; |
cfb180f3 | 1027 | |
ae63b31e | 1028 | err = apply_subsystem_event_filter(dir, buf); |
8b372562 TZ |
1029 | free_page((unsigned long) buf); |
1030 | if (err < 0) | |
44e9c8b7 | 1031 | return err; |
cfb180f3 TZ |
1032 | |
1033 | *ppos += cnt; | |
1034 | ||
1035 | return cnt; | |
1036 | } | |
1037 | ||
d1b182a8 SR |
1038 | static ssize_t |
1039 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1040 | { | |
1041 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1042 | struct trace_seq *s; | |
1043 | int r; | |
1044 | ||
1045 | if (*ppos) | |
1046 | return 0; | |
1047 | ||
1048 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1049 | if (!s) | |
1050 | return -ENOMEM; | |
1051 | ||
1052 | trace_seq_init(s); | |
1053 | ||
1054 | func(s); | |
1055 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
1056 | ||
1057 | kfree(s); | |
1058 | ||
1059 | return r; | |
1060 | } | |
1061 | ||
15075cac SR |
1062 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1063 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
1064 | ||
b77e38aa SR |
1065 | static const struct seq_operations show_event_seq_ops = { |
1066 | .start = t_start, | |
1067 | .next = t_next, | |
1068 | .show = t_show, | |
1069 | .stop = t_stop, | |
1070 | }; | |
1071 | ||
1072 | static const struct seq_operations show_set_event_seq_ops = { | |
1073 | .start = s_start, | |
1074 | .next = s_next, | |
1075 | .show = t_show, | |
1076 | .stop = t_stop, | |
1077 | }; | |
1078 | ||
2314c4ae | 1079 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1080 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1081 | .read = seq_read, |
1082 | .llseek = seq_lseek, | |
1083 | .release = seq_release, | |
1084 | }; | |
1085 | ||
b77e38aa | 1086 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1087 | .open = ftrace_event_set_open, |
b77e38aa SR |
1088 | .read = seq_read, |
1089 | .write = ftrace_event_write, | |
1090 | .llseek = seq_lseek, | |
1091 | .release = seq_release, | |
1092 | }; | |
1093 | ||
1473e441 SR |
1094 | static const struct file_operations ftrace_enable_fops = { |
1095 | .open = tracing_open_generic, | |
1096 | .read = event_enable_read, | |
1097 | .write = event_enable_write, | |
6038f373 | 1098 | .llseek = default_llseek, |
1473e441 SR |
1099 | }; |
1100 | ||
981d081e | 1101 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1102 | .open = trace_format_open, |
1103 | .read = seq_read, | |
1104 | .llseek = seq_lseek, | |
1105 | .release = seq_release, | |
981d081e SR |
1106 | }; |
1107 | ||
23725aee PZ |
1108 | static const struct file_operations ftrace_event_id_fops = { |
1109 | .open = tracing_open_generic, | |
1110 | .read = event_id_read, | |
6038f373 | 1111 | .llseek = default_llseek, |
23725aee PZ |
1112 | }; |
1113 | ||
7ce7e424 TZ |
1114 | static const struct file_operations ftrace_event_filter_fops = { |
1115 | .open = tracing_open_generic, | |
1116 | .read = event_filter_read, | |
1117 | .write = event_filter_write, | |
6038f373 | 1118 | .llseek = default_llseek, |
7ce7e424 TZ |
1119 | }; |
1120 | ||
cfb180f3 | 1121 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1122 | .open = subsystem_open, |
cfb180f3 TZ |
1123 | .read = subsystem_filter_read, |
1124 | .write = subsystem_filter_write, | |
6038f373 | 1125 | .llseek = default_llseek, |
e9dbfae5 | 1126 | .release = subsystem_release, |
cfb180f3 TZ |
1127 | }; |
1128 | ||
8ae79a13 | 1129 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1130 | .open = subsystem_open, |
8ae79a13 SR |
1131 | .read = system_enable_read, |
1132 | .write = system_enable_write, | |
6038f373 | 1133 | .llseek = default_llseek, |
40ee4dff | 1134 | .release = subsystem_release, |
8ae79a13 SR |
1135 | }; |
1136 | ||
ae63b31e SR |
1137 | static const struct file_operations ftrace_tr_enable_fops = { |
1138 | .open = system_tr_open, | |
1139 | .read = system_enable_read, | |
1140 | .write = system_enable_write, | |
1141 | .llseek = default_llseek, | |
1142 | .release = subsystem_release, | |
1143 | }; | |
1144 | ||
d1b182a8 SR |
1145 | static const struct file_operations ftrace_show_header_fops = { |
1146 | .open = tracing_open_generic, | |
1147 | .read = show_header, | |
6038f373 | 1148 | .llseek = default_llseek, |
d1b182a8 SR |
1149 | }; |
1150 | ||
ae63b31e SR |
1151 | static int |
1152 | ftrace_event_open(struct inode *inode, struct file *file, | |
1153 | const struct seq_operations *seq_ops) | |
1473e441 | 1154 | { |
ae63b31e SR |
1155 | struct seq_file *m; |
1156 | int ret; | |
1473e441 | 1157 | |
ae63b31e SR |
1158 | ret = seq_open(file, seq_ops); |
1159 | if (ret < 0) | |
1160 | return ret; | |
1161 | m = file->private_data; | |
1162 | /* copy tr over to seq ops */ | |
1163 | m->private = inode->i_private; | |
1473e441 | 1164 | |
ae63b31e | 1165 | return ret; |
1473e441 SR |
1166 | } |
1167 | ||
15075cac SR |
1168 | static int |
1169 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1170 | { | |
1171 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1172 | ||
ae63b31e | 1173 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1174 | } |
1175 | ||
1176 | static int | |
1177 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1178 | { | |
1179 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1180 | struct trace_array *tr = inode->i_private; |
15075cac SR |
1181 | |
1182 | if ((file->f_mode & FMODE_WRITE) && | |
1183 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1184 | ftrace_clear_events(tr); |
15075cac | 1185 | |
ae63b31e SR |
1186 | return ftrace_event_open(inode, file, seq_ops); |
1187 | } | |
1188 | ||
1189 | static struct event_subsystem * | |
1190 | create_new_subsystem(const char *name) | |
1191 | { | |
1192 | struct event_subsystem *system; | |
1193 | ||
1194 | /* need to create new entry */ | |
1195 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1196 | if (!system) | |
1197 | return NULL; | |
1198 | ||
1199 | system->ref_count = 1; | |
1200 | system->name = kstrdup(name, GFP_KERNEL); | |
1201 | ||
1202 | if (!system->name) | |
1203 | goto out_free; | |
1204 | ||
1205 | system->filter = NULL; | |
1206 | ||
1207 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1208 | if (!system->filter) | |
1209 | goto out_free; | |
1210 | ||
1211 | list_add(&system->list, &event_subsystems); | |
1212 | ||
1213 | return system; | |
1214 | ||
1215 | out_free: | |
1216 | kfree(system->name); | |
1217 | kfree(system); | |
1218 | return NULL; | |
15075cac SR |
1219 | } |
1220 | ||
6ecc2d1c | 1221 | static struct dentry * |
ae63b31e SR |
1222 | event_subsystem_dir(struct trace_array *tr, const char *name, |
1223 | struct ftrace_event_file *file, struct dentry *parent) | |
6ecc2d1c | 1224 | { |
ae63b31e | 1225 | struct ftrace_subsystem_dir *dir; |
6ecc2d1c | 1226 | struct event_subsystem *system; |
e1112b4d | 1227 | struct dentry *entry; |
6ecc2d1c SR |
1228 | |
1229 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1230 | list_for_each_entry(dir, &tr->systems, list) { |
1231 | system = dir->subsystem; | |
dc82ec98 | 1232 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1233 | dir->nr_events++; |
1234 | file->system = dir; | |
1235 | return dir->entry; | |
dc82ec98 | 1236 | } |
6ecc2d1c SR |
1237 | } |
1238 | ||
ae63b31e SR |
1239 | /* Now see if the system itself exists. */ |
1240 | list_for_each_entry(system, &event_subsystems, list) { | |
1241 | if (strcmp(system->name, name) == 0) | |
1242 | break; | |
6ecc2d1c | 1243 | } |
ae63b31e SR |
1244 | /* Reset system variable when not found */ |
1245 | if (&system->list == &event_subsystems) | |
1246 | system = NULL; | |
6ecc2d1c | 1247 | |
ae63b31e SR |
1248 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1249 | if (!dir) | |
1250 | goto out_fail; | |
6ecc2d1c | 1251 | |
ae63b31e SR |
1252 | if (!system) { |
1253 | system = create_new_subsystem(name); | |
1254 | if (!system) | |
1255 | goto out_free; | |
1256 | } else | |
1257 | __get_system(system); | |
1258 | ||
1259 | dir->entry = debugfs_create_dir(name, parent); | |
1260 | if (!dir->entry) { | |
1261 | pr_warning("Failed to create system directory %s\n", name); | |
1262 | __put_system(system); | |
1263 | goto out_free; | |
6d723736 SR |
1264 | } |
1265 | ||
ae63b31e SR |
1266 | dir->tr = tr; |
1267 | dir->ref_count = 1; | |
1268 | dir->nr_events = 1; | |
1269 | dir->subsystem = system; | |
1270 | file->system = dir; | |
8b372562 | 1271 | |
ae63b31e | 1272 | entry = debugfs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1273 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1274 | if (!entry) { |
1275 | kfree(system->filter); | |
1276 | system->filter = NULL; | |
ae63b31e | 1277 | pr_warning("Could not create debugfs '%s/filter' entry\n", name); |
8b372562 | 1278 | } |
e1112b4d | 1279 | |
ae63b31e | 1280 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1281 | &ftrace_system_enable_fops); |
8ae79a13 | 1282 | |
ae63b31e SR |
1283 | list_add(&dir->list, &tr->systems); |
1284 | ||
1285 | return dir->entry; | |
1286 | ||
1287 | out_free: | |
1288 | kfree(dir); | |
1289 | out_fail: | |
1290 | /* Only print this message if failed on memory allocation */ | |
1291 | if (!dir || !system) | |
1292 | pr_warning("No memory to create event subsystem %s\n", | |
1293 | name); | |
1294 | return NULL; | |
6ecc2d1c SR |
1295 | } |
1296 | ||
1473e441 | 1297 | static int |
ae63b31e SR |
1298 | event_create_dir(struct dentry *parent, |
1299 | struct ftrace_event_file *file, | |
701970b3 SR |
1300 | const struct file_operations *id, |
1301 | const struct file_operations *enable, | |
1302 | const struct file_operations *filter, | |
1303 | const struct file_operations *format) | |
1473e441 | 1304 | { |
ae63b31e SR |
1305 | struct ftrace_event_call *call = file->event_call; |
1306 | struct trace_array *tr = file->tr; | |
2e33af02 | 1307 | struct list_head *head; |
ae63b31e | 1308 | struct dentry *d_events; |
fd994989 | 1309 | int ret; |
1473e441 | 1310 | |
6ecc2d1c SR |
1311 | /* |
1312 | * If the trace point header did not define TRACE_SYSTEM | |
1313 | * then the system would be called "TRACE_SYSTEM". | |
1314 | */ | |
ae63b31e SR |
1315 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1316 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1317 | if (!d_events) | |
1318 | return -ENOMEM; | |
1319 | } else | |
1320 | d_events = parent; | |
1321 | ||
1322 | file->dir = debugfs_create_dir(call->name, d_events); | |
1323 | if (!file->dir) { | |
1324 | pr_warning("Could not create debugfs '%s' directory\n", | |
1325 | call->name); | |
1473e441 SR |
1326 | return -1; |
1327 | } | |
1328 | ||
9b63776f | 1329 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1330 | trace_create_file("enable", 0644, file->dir, file, |
f3f3f009 | 1331 | enable); |
1473e441 | 1332 | |
2239291a | 1333 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1334 | if (call->event.type && call->class->reg) |
ae63b31e | 1335 | trace_create_file("id", 0444, file->dir, call, |
f3f3f009 | 1336 | id); |
2239291a | 1337 | #endif |
23725aee | 1338 | |
c9d932cf LZ |
1339 | /* |
1340 | * Other events may have the same class. Only update | |
1341 | * the fields if they are not already defined. | |
1342 | */ | |
1343 | head = trace_get_fields(call); | |
1344 | if (list_empty(head)) { | |
1345 | ret = call->class->define_fields(call); | |
1346 | if (ret < 0) { | |
1347 | pr_warning("Could not initialize trace point" | |
1348 | " events/%s\n", call->name); | |
ae63b31e | 1349 | return -1; |
cf027f64 TZ |
1350 | } |
1351 | } | |
ae63b31e | 1352 | trace_create_file("filter", 0644, file->dir, call, |
c9d932cf | 1353 | filter); |
cf027f64 | 1354 | |
ae63b31e | 1355 | trace_create_file("format", 0444, file->dir, call, |
f3f3f009 | 1356 | format); |
6d723736 SR |
1357 | |
1358 | return 0; | |
1359 | } | |
1360 | ||
ae63b31e SR |
1361 | static void remove_subsystem(struct ftrace_subsystem_dir *dir) |
1362 | { | |
1363 | if (!dir) | |
1364 | return; | |
1365 | ||
1366 | if (!--dir->nr_events) { | |
1367 | debugfs_remove_recursive(dir->entry); | |
1368 | list_del(&dir->list); | |
1369 | __put_system_dir(dir); | |
1370 | } | |
1371 | } | |
1372 | ||
1373 | static void remove_event_from_tracers(struct ftrace_event_call *call) | |
1374 | { | |
1375 | struct ftrace_event_file *file; | |
1376 | struct trace_array *tr; | |
1377 | ||
1378 | do_for_each_event_file_safe(tr, file) { | |
1379 | ||
1380 | if (file->event_call != call) | |
1381 | continue; | |
1382 | ||
1383 | list_del(&file->list); | |
1384 | debugfs_remove_recursive(file->dir); | |
1385 | remove_subsystem(file->system); | |
1386 | kfree(file); | |
1387 | ||
1388 | /* | |
1389 | * The do_for_each_event_file_safe() is | |
1390 | * a double loop. After finding the call for this | |
1391 | * trace_array, we use break to jump to the next | |
1392 | * trace_array. | |
1393 | */ | |
1394 | break; | |
1395 | } while_for_each_event_file(); | |
1396 | } | |
1397 | ||
8781915a EG |
1398 | static void event_remove(struct ftrace_event_call *call) |
1399 | { | |
ae63b31e SR |
1400 | struct trace_array *tr; |
1401 | struct ftrace_event_file *file; | |
1402 | ||
1403 | do_for_each_event_file(tr, file) { | |
1404 | if (file->event_call != call) | |
1405 | continue; | |
1406 | ftrace_event_enable_disable(file, 0); | |
1407 | /* | |
1408 | * The do_for_each_event_file() is | |
1409 | * a double loop. After finding the call for this | |
1410 | * trace_array, we use break to jump to the next | |
1411 | * trace_array. | |
1412 | */ | |
1413 | break; | |
1414 | } while_for_each_event_file(); | |
1415 | ||
8781915a EG |
1416 | if (call->event.funcs) |
1417 | __unregister_ftrace_event(&call->event); | |
ae63b31e | 1418 | remove_event_from_tracers(call); |
8781915a EG |
1419 | list_del(&call->list); |
1420 | } | |
1421 | ||
1422 | static int event_init(struct ftrace_event_call *call) | |
1423 | { | |
1424 | int ret = 0; | |
1425 | ||
1426 | if (WARN_ON(!call->name)) | |
1427 | return -EINVAL; | |
1428 | ||
1429 | if (call->class->raw_init) { | |
1430 | ret = call->class->raw_init(call); | |
1431 | if (ret < 0 && ret != -ENOSYS) | |
1432 | pr_warn("Could not initialize trace events/%s\n", | |
1433 | call->name); | |
1434 | } | |
1435 | ||
1436 | return ret; | |
1437 | } | |
1438 | ||
67ead0a6 | 1439 | static int |
ae63b31e | 1440 | __register_event(struct ftrace_event_call *call, struct module *mod) |
bd1a5c84 | 1441 | { |
bd1a5c84 | 1442 | int ret; |
6d723736 | 1443 | |
8781915a EG |
1444 | ret = event_init(call); |
1445 | if (ret < 0) | |
1446 | return ret; | |
701970b3 | 1447 | |
ae63b31e | 1448 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 1449 | call->mod = mod; |
88f70d75 | 1450 | |
ae63b31e | 1451 | return 0; |
bd1a5c84 MH |
1452 | } |
1453 | ||
ae63b31e SR |
1454 | /* Add an event to a trace directory */ |
1455 | static int | |
1456 | __trace_add_new_event(struct ftrace_event_call *call, | |
1457 | struct trace_array *tr, | |
1458 | const struct file_operations *id, | |
1459 | const struct file_operations *enable, | |
1460 | const struct file_operations *filter, | |
1461 | const struct file_operations *format) | |
1462 | { | |
1463 | struct ftrace_event_file *file; | |
1464 | ||
1465 | file = kzalloc(sizeof(*file), GFP_KERNEL); | |
1466 | if (!file) | |
1467 | return -ENOMEM; | |
1468 | ||
1469 | file->event_call = call; | |
1470 | file->tr = tr; | |
1471 | list_add(&file->list, &tr->events); | |
1472 | ||
1473 | return event_create_dir(tr->event_dir, file, id, enable, filter, format); | |
1474 | } | |
1475 | ||
1476 | struct ftrace_module_file_ops; | |
1477 | static void __add_event_to_tracers(struct ftrace_event_call *call, | |
1478 | struct ftrace_module_file_ops *file_ops); | |
1479 | ||
bd1a5c84 MH |
1480 | /* Add an additional event_call dynamically */ |
1481 | int trace_add_event_call(struct ftrace_event_call *call) | |
1482 | { | |
1483 | int ret; | |
1484 | mutex_lock(&event_mutex); | |
701970b3 | 1485 | |
ae63b31e SR |
1486 | ret = __register_event(call, NULL); |
1487 | if (ret >= 0) | |
1488 | __add_event_to_tracers(call, NULL); | |
a2ca5e03 | 1489 | |
ae63b31e SR |
1490 | mutex_unlock(&event_mutex); |
1491 | return ret; | |
a2ca5e03 FW |
1492 | } |
1493 | ||
4fead8e4 MH |
1494 | /* |
1495 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1496 | */ | |
bd1a5c84 MH |
1497 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1498 | { | |
8781915a | 1499 | event_remove(call); |
bd1a5c84 MH |
1500 | trace_destroy_fields(call); |
1501 | destroy_preds(call); | |
bd1a5c84 MH |
1502 | } |
1503 | ||
1504 | /* Remove an event_call */ | |
1505 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1506 | { | |
1507 | mutex_lock(&event_mutex); | |
4fead8e4 | 1508 | down_write(&trace_event_mutex); |
bd1a5c84 | 1509 | __trace_remove_event_call(call); |
4fead8e4 | 1510 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1511 | mutex_unlock(&event_mutex); |
1512 | } | |
1513 | ||
1514 | #define for_each_event(event, start, end) \ | |
1515 | for (event = start; \ | |
1516 | (unsigned long)event < (unsigned long)end; \ | |
1517 | event++) | |
1518 | ||
1519 | #ifdef CONFIG_MODULES | |
1520 | ||
1521 | static LIST_HEAD(ftrace_module_file_list); | |
1522 | ||
1523 | /* | |
1524 | * Modules must own their file_operations to keep up with | |
1525 | * reference counting. | |
1526 | */ | |
1527 | struct ftrace_module_file_ops { | |
1528 | struct list_head list; | |
1529 | struct module *mod; | |
1530 | struct file_operations id; | |
1531 | struct file_operations enable; | |
1532 | struct file_operations format; | |
1533 | struct file_operations filter; | |
1534 | }; | |
1535 | ||
ae63b31e SR |
1536 | static struct ftrace_module_file_ops *find_ftrace_file_ops(struct module *mod) |
1537 | { | |
1538 | struct ftrace_module_file_ops *file_ops; | |
1539 | ||
1540 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1541 | if (file_ops->mod == mod) | |
1542 | return file_ops; | |
1543 | } | |
1544 | return NULL; | |
1545 | } | |
1546 | ||
701970b3 SR |
1547 | static struct ftrace_module_file_ops * |
1548 | trace_create_file_ops(struct module *mod) | |
1549 | { | |
1550 | struct ftrace_module_file_ops *file_ops; | |
1551 | ||
1552 | /* | |
1553 | * This is a bit of a PITA. To allow for correct reference | |
1554 | * counting, modules must "own" their file_operations. | |
1555 | * To do this, we allocate the file operations that will be | |
1556 | * used in the event directory. | |
1557 | */ | |
1558 | ||
1559 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1560 | if (!file_ops) | |
1561 | return NULL; | |
1562 | ||
1563 | file_ops->mod = mod; | |
1564 | ||
1565 | file_ops->id = ftrace_event_id_fops; | |
1566 | file_ops->id.owner = mod; | |
1567 | ||
1568 | file_ops->enable = ftrace_enable_fops; | |
1569 | file_ops->enable.owner = mod; | |
1570 | ||
1571 | file_ops->filter = ftrace_event_filter_fops; | |
1572 | file_ops->filter.owner = mod; | |
1573 | ||
1574 | file_ops->format = ftrace_event_format_fops; | |
1575 | file_ops->format.owner = mod; | |
1576 | ||
1577 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1578 | ||
1579 | return file_ops; | |
1580 | } | |
1581 | ||
6d723736 SR |
1582 | static void trace_module_add_events(struct module *mod) |
1583 | { | |
701970b3 | 1584 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1585 | struct ftrace_event_call **call, **start, **end; |
6d723736 SR |
1586 | |
1587 | start = mod->trace_events; | |
1588 | end = mod->trace_events + mod->num_trace_events; | |
1589 | ||
1590 | if (start == end) | |
1591 | return; | |
1592 | ||
67ead0a6 LZ |
1593 | file_ops = trace_create_file_ops(mod); |
1594 | if (!file_ops) | |
6d723736 SR |
1595 | return; |
1596 | ||
1597 | for_each_event(call, start, end) { | |
ae63b31e SR |
1598 | __register_event(*call, mod); |
1599 | __add_event_to_tracers(*call, file_ops); | |
6d723736 SR |
1600 | } |
1601 | } | |
1602 | ||
1603 | static void trace_module_remove_events(struct module *mod) | |
1604 | { | |
701970b3 | 1605 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1606 | struct ftrace_event_call *call, *p; |
9456f0fa | 1607 | bool found = false; |
6d723736 | 1608 | |
110bf2b7 | 1609 | down_write(&trace_event_mutex); |
6d723736 SR |
1610 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1611 | if (call->mod == mod) { | |
9456f0fa | 1612 | found = true; |
bd1a5c84 | 1613 | __trace_remove_event_call(call); |
6d723736 SR |
1614 | } |
1615 | } | |
701970b3 SR |
1616 | |
1617 | /* Now free the file_operations */ | |
1618 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1619 | if (file_ops->mod == mod) | |
1620 | break; | |
1621 | } | |
1622 | if (&file_ops->list != &ftrace_module_file_list) { | |
1623 | list_del(&file_ops->list); | |
1624 | kfree(file_ops); | |
1625 | } | |
9456f0fa SR |
1626 | |
1627 | /* | |
1628 | * It is safest to reset the ring buffer if the module being unloaded | |
1629 | * registered any events. | |
1630 | */ | |
1631 | if (found) | |
1632 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1633 | up_write(&trace_event_mutex); |
6d723736 SR |
1634 | } |
1635 | ||
61f919a1 SR |
1636 | static int trace_module_notify(struct notifier_block *self, |
1637 | unsigned long val, void *data) | |
6d723736 SR |
1638 | { |
1639 | struct module *mod = data; | |
1640 | ||
1641 | mutex_lock(&event_mutex); | |
1642 | switch (val) { | |
1643 | case MODULE_STATE_COMING: | |
1644 | trace_module_add_events(mod); | |
1645 | break; | |
1646 | case MODULE_STATE_GOING: | |
1647 | trace_module_remove_events(mod); | |
1648 | break; | |
1649 | } | |
1650 | mutex_unlock(&event_mutex); | |
fd994989 | 1651 | |
1473e441 SR |
1652 | return 0; |
1653 | } | |
61f919a1 | 1654 | #else |
ae63b31e SR |
1655 | static struct ftrace_module_file_ops *find_ftrace_file_ops(struct module *mod) |
1656 | { | |
1657 | return NULL; | |
1658 | } | |
61f919a1 SR |
1659 | static int trace_module_notify(struct notifier_block *self, |
1660 | unsigned long val, void *data) | |
1661 | { | |
1662 | return 0; | |
1663 | } | |
1664 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1665 | |
ae63b31e SR |
1666 | /* Create a new event directory structure for a trace directory. */ |
1667 | static void | |
1668 | __trace_add_event_dirs(struct trace_array *tr) | |
1669 | { | |
1670 | struct ftrace_module_file_ops *file_ops = NULL; | |
1671 | struct ftrace_event_call *call; | |
1672 | int ret; | |
1673 | ||
1674 | list_for_each_entry(call, &ftrace_events, list) { | |
1675 | if (call->mod) { | |
1676 | /* | |
1677 | * Directories for events by modules need to | |
1678 | * keep module ref counts when opened (as we don't | |
1679 | * want the module to disappear when reading one | |
1680 | * of these files). The file_ops keep account of | |
1681 | * the module ref count. | |
1682 | * | |
1683 | * As event_calls are added in groups by module, | |
1684 | * when we find one file_ops, we don't need to search for | |
1685 | * each call in that module, as the rest should be the | |
1686 | * same. Only search for a new one if the last one did | |
1687 | * not match. | |
1688 | */ | |
1689 | if (!file_ops || call->mod != file_ops->mod) | |
1690 | file_ops = find_ftrace_file_ops(call->mod); | |
1691 | if (!file_ops) | |
1692 | continue; /* Warn? */ | |
1693 | ret = __trace_add_new_event(call, tr, | |
1694 | &file_ops->id, &file_ops->enable, | |
1695 | &file_ops->filter, &file_ops->format); | |
1696 | if (ret < 0) | |
1697 | pr_warning("Could not create directory for event %s\n", | |
1698 | call->name); | |
1699 | continue; | |
1700 | } | |
1701 | ret = __trace_add_new_event(call, tr, | |
1702 | &ftrace_event_id_fops, | |
1703 | &ftrace_enable_fops, | |
1704 | &ftrace_event_filter_fops, | |
1705 | &ftrace_event_format_fops); | |
1706 | if (ret < 0) | |
1707 | pr_warning("Could not create directory for event %s\n", | |
1708 | call->name); | |
1709 | } | |
1710 | } | |
1711 | ||
1712 | static void | |
1713 | __add_event_to_tracers(struct ftrace_event_call *call, | |
1714 | struct ftrace_module_file_ops *file_ops) | |
1715 | { | |
1716 | struct trace_array *tr; | |
1717 | ||
1718 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
1719 | if (file_ops) | |
1720 | __trace_add_new_event(call, tr, | |
1721 | &file_ops->id, &file_ops->enable, | |
1722 | &file_ops->filter, &file_ops->format); | |
1723 | else | |
1724 | __trace_add_new_event(call, tr, | |
1725 | &ftrace_event_id_fops, | |
1726 | &ftrace_enable_fops, | |
1727 | &ftrace_event_filter_fops, | |
1728 | &ftrace_event_format_fops); | |
1729 | } | |
1730 | } | |
1731 | ||
ec827c7e | 1732 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1733 | .notifier_call = trace_module_notify, |
1734 | .priority = 0, | |
1735 | }; | |
1736 | ||
e4a9ea5e SR |
1737 | extern struct ftrace_event_call *__start_ftrace_events[]; |
1738 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 1739 | |
020e5f85 LZ |
1740 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1741 | ||
1742 | static __init int setup_trace_event(char *str) | |
1743 | { | |
1744 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1745 | ring_buffer_expanded = 1; | |
1746 | tracing_selftest_disabled = 1; | |
1747 | ||
1748 | return 1; | |
1749 | } | |
1750 | __setup("trace_event=", setup_trace_event); | |
1751 | ||
ae63b31e SR |
1752 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) |
1753 | { | |
1754 | struct dentry *d_events; | |
1755 | struct dentry *entry; | |
1756 | ||
1757 | entry = debugfs_create_file("set_event", 0644, parent, | |
1758 | tr, &ftrace_set_event_fops); | |
1759 | if (!entry) { | |
1760 | pr_warning("Could not create debugfs 'set_event' entry\n"); | |
1761 | return -ENOMEM; | |
1762 | } | |
1763 | ||
1764 | d_events = debugfs_create_dir("events", parent); | |
1765 | if (!d_events) | |
1766 | pr_warning("Could not create debugfs 'events' directory\n"); | |
1767 | ||
1768 | /* ring buffer internal formats */ | |
1769 | trace_create_file("header_page", 0444, d_events, | |
1770 | ring_buffer_print_page_header, | |
1771 | &ftrace_show_header_fops); | |
1772 | ||
1773 | trace_create_file("header_event", 0444, d_events, | |
1774 | ring_buffer_print_entry_header, | |
1775 | &ftrace_show_header_fops); | |
1776 | ||
1777 | trace_create_file("enable", 0644, d_events, | |
1778 | tr, &ftrace_tr_enable_fops); | |
1779 | ||
1780 | tr->event_dir = d_events; | |
1781 | __trace_add_event_dirs(tr); | |
1782 | ||
1783 | return 0; | |
1784 | } | |
1785 | ||
8781915a EG |
1786 | static __init int event_trace_enable(void) |
1787 | { | |
ae63b31e | 1788 | struct trace_array *tr = top_trace_array(); |
8781915a EG |
1789 | struct ftrace_event_call **iter, *call; |
1790 | char *buf = bootup_event_buf; | |
1791 | char *token; | |
1792 | int ret; | |
1793 | ||
1794 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { | |
1795 | ||
1796 | call = *iter; | |
1797 | ret = event_init(call); | |
1798 | if (!ret) | |
1799 | list_add(&call->list, &ftrace_events); | |
1800 | } | |
1801 | ||
1802 | while (true) { | |
1803 | token = strsep(&buf, ","); | |
1804 | ||
1805 | if (!token) | |
1806 | break; | |
1807 | if (!*token) | |
1808 | continue; | |
1809 | ||
ae63b31e | 1810 | ret = ftrace_set_clr_event(tr, token, 1); |
8781915a EG |
1811 | if (ret) |
1812 | pr_warn("Failed to enable trace event: %s\n", token); | |
1813 | } | |
81698831 SR |
1814 | |
1815 | trace_printk_start_comm(); | |
1816 | ||
8781915a EG |
1817 | return 0; |
1818 | } | |
1819 | ||
b77e38aa SR |
1820 | static __init int event_trace_init(void) |
1821 | { | |
ae63b31e | 1822 | struct trace_array *tr; |
b77e38aa SR |
1823 | struct dentry *d_tracer; |
1824 | struct dentry *entry; | |
6d723736 | 1825 | int ret; |
b77e38aa | 1826 | |
ae63b31e SR |
1827 | tr = top_trace_array(); |
1828 | ||
b77e38aa SR |
1829 | d_tracer = tracing_init_dentry(); |
1830 | if (!d_tracer) | |
1831 | return 0; | |
1832 | ||
2314c4ae | 1833 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 1834 | tr, &ftrace_avail_fops); |
2314c4ae SR |
1835 | if (!entry) |
1836 | pr_warning("Could not create debugfs " | |
1837 | "'available_events' entry\n"); | |
1838 | ||
8728fe50 LZ |
1839 | if (trace_define_common_fields()) |
1840 | pr_warning("tracing: Failed to allocate common fields"); | |
1841 | ||
ae63b31e SR |
1842 | ret = event_trace_add_tracer(d_tracer, tr); |
1843 | if (ret) | |
1844 | return ret; | |
020e5f85 | 1845 | |
6d723736 | 1846 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 1847 | if (ret) |
6d723736 SR |
1848 | pr_warning("Failed to register trace events module notifier\n"); |
1849 | ||
b77e38aa SR |
1850 | return 0; |
1851 | } | |
8781915a | 1852 | core_initcall(event_trace_enable); |
b77e38aa | 1853 | fs_initcall(event_trace_init); |
e6187007 SR |
1854 | |
1855 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
1856 | ||
1857 | static DEFINE_SPINLOCK(test_spinlock); | |
1858 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
1859 | static DEFINE_MUTEX(test_mutex); | |
1860 | ||
1861 | static __init void test_work(struct work_struct *dummy) | |
1862 | { | |
1863 | spin_lock(&test_spinlock); | |
1864 | spin_lock_irq(&test_spinlock_irq); | |
1865 | udelay(1); | |
1866 | spin_unlock_irq(&test_spinlock_irq); | |
1867 | spin_unlock(&test_spinlock); | |
1868 | ||
1869 | mutex_lock(&test_mutex); | |
1870 | msleep(1); | |
1871 | mutex_unlock(&test_mutex); | |
1872 | } | |
1873 | ||
1874 | static __init int event_test_thread(void *unused) | |
1875 | { | |
1876 | void *test_malloc; | |
1877 | ||
1878 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
1879 | if (!test_malloc) | |
1880 | pr_info("failed to kmalloc\n"); | |
1881 | ||
1882 | schedule_on_each_cpu(test_work); | |
1883 | ||
1884 | kfree(test_malloc); | |
1885 | ||
1886 | set_current_state(TASK_INTERRUPTIBLE); | |
1887 | while (!kthread_should_stop()) | |
1888 | schedule(); | |
1889 | ||
1890 | return 0; | |
1891 | } | |
1892 | ||
1893 | /* | |
1894 | * Do various things that may trigger events. | |
1895 | */ | |
1896 | static __init void event_test_stuff(void) | |
1897 | { | |
1898 | struct task_struct *test_thread; | |
1899 | ||
1900 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
1901 | msleep(1); | |
1902 | kthread_stop(test_thread); | |
1903 | } | |
1904 | ||
1905 | /* | |
1906 | * For every trace event defined, we will test each trace point separately, | |
1907 | * and then by groups, and finally all trace points. | |
1908 | */ | |
9ea21c1e | 1909 | static __init void event_trace_self_tests(void) |
e6187007 | 1910 | { |
ae63b31e SR |
1911 | struct ftrace_subsystem_dir *dir; |
1912 | struct ftrace_event_file *file; | |
e6187007 SR |
1913 | struct ftrace_event_call *call; |
1914 | struct event_subsystem *system; | |
ae63b31e | 1915 | struct trace_array *tr; |
e6187007 SR |
1916 | int ret; |
1917 | ||
ae63b31e SR |
1918 | tr = top_trace_array(); |
1919 | ||
e6187007 SR |
1920 | pr_info("Running tests on trace events:\n"); |
1921 | ||
ae63b31e SR |
1922 | list_for_each_entry(file, &tr->events, list) { |
1923 | ||
1924 | call = file->event_call; | |
e6187007 | 1925 | |
2239291a SR |
1926 | /* Only test those that have a probe */ |
1927 | if (!call->class || !call->class->probe) | |
e6187007 SR |
1928 | continue; |
1929 | ||
1f5a6b45 SR |
1930 | /* |
1931 | * Testing syscall events here is pretty useless, but | |
1932 | * we still do it if configured. But this is time consuming. | |
1933 | * What we really need is a user thread to perform the | |
1934 | * syscalls as we test. | |
1935 | */ | |
1936 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
1937 | if (call->class->system && |
1938 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
1939 | continue; |
1940 | #endif | |
1941 | ||
e6187007 SR |
1942 | pr_info("Testing event %s: ", call->name); |
1943 | ||
1944 | /* | |
1945 | * If an event is already enabled, someone is using | |
1946 | * it and the self test should not be on. | |
1947 | */ | |
ae63b31e | 1948 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
1949 | pr_warning("Enabled event during self test!\n"); |
1950 | WARN_ON_ONCE(1); | |
1951 | continue; | |
1952 | } | |
1953 | ||
ae63b31e | 1954 | ftrace_event_enable_disable(file, 1); |
e6187007 | 1955 | event_test_stuff(); |
ae63b31e | 1956 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
1957 | |
1958 | pr_cont("OK\n"); | |
1959 | } | |
1960 | ||
1961 | /* Now test at the sub system level */ | |
1962 | ||
1963 | pr_info("Running tests on trace event systems:\n"); | |
1964 | ||
ae63b31e SR |
1965 | list_for_each_entry(dir, &tr->systems, list) { |
1966 | ||
1967 | system = dir->subsystem; | |
e6187007 SR |
1968 | |
1969 | /* the ftrace system is special, skip it */ | |
1970 | if (strcmp(system->name, "ftrace") == 0) | |
1971 | continue; | |
1972 | ||
1973 | pr_info("Testing event system %s: ", system->name); | |
1974 | ||
ae63b31e | 1975 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 SR |
1976 | if (WARN_ON_ONCE(ret)) { |
1977 | pr_warning("error enabling system %s\n", | |
1978 | system->name); | |
1979 | continue; | |
1980 | } | |
1981 | ||
1982 | event_test_stuff(); | |
1983 | ||
ae63b31e | 1984 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 1985 | if (WARN_ON_ONCE(ret)) { |
e6187007 SR |
1986 | pr_warning("error disabling system %s\n", |
1987 | system->name); | |
76bab1b7 YL |
1988 | continue; |
1989 | } | |
e6187007 SR |
1990 | |
1991 | pr_cont("OK\n"); | |
1992 | } | |
1993 | ||
1994 | /* Test with all events enabled */ | |
1995 | ||
1996 | pr_info("Running tests on all trace events:\n"); | |
1997 | pr_info("Testing all events: "); | |
1998 | ||
ae63b31e | 1999 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 2000 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 2001 | pr_warning("error enabling all events\n"); |
9ea21c1e | 2002 | return; |
e6187007 SR |
2003 | } |
2004 | ||
2005 | event_test_stuff(); | |
2006 | ||
2007 | /* reset sysname */ | |
ae63b31e | 2008 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 SR |
2009 | if (WARN_ON_ONCE(ret)) { |
2010 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 2011 | return; |
e6187007 SR |
2012 | } |
2013 | ||
2014 | pr_cont("OK\n"); | |
9ea21c1e SR |
2015 | } |
2016 | ||
2017 | #ifdef CONFIG_FUNCTION_TRACER | |
2018 | ||
245b2e70 | 2019 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
2020 | |
2021 | static void | |
2f5f6ad9 | 2022 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 2023 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
2024 | { |
2025 | struct ring_buffer_event *event; | |
e77405ad | 2026 | struct ring_buffer *buffer; |
9ea21c1e SR |
2027 | struct ftrace_entry *entry; |
2028 | unsigned long flags; | |
2029 | long disabled; | |
9ea21c1e SR |
2030 | int cpu; |
2031 | int pc; | |
2032 | ||
2033 | pc = preempt_count(); | |
5168ae50 | 2034 | preempt_disable_notrace(); |
9ea21c1e | 2035 | cpu = raw_smp_processor_id(); |
245b2e70 | 2036 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
2037 | |
2038 | if (disabled != 1) | |
2039 | goto out; | |
2040 | ||
2041 | local_save_flags(flags); | |
2042 | ||
e77405ad SR |
2043 | event = trace_current_buffer_lock_reserve(&buffer, |
2044 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
2045 | flags, pc); |
2046 | if (!event) | |
2047 | goto out; | |
2048 | entry = ring_buffer_event_data(event); | |
2049 | entry->ip = ip; | |
2050 | entry->parent_ip = parent_ip; | |
2051 | ||
0d5c6e1c | 2052 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
2053 | |
2054 | out: | |
245b2e70 | 2055 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 2056 | preempt_enable_notrace(); |
9ea21c1e SR |
2057 | } |
2058 | ||
2059 | static struct ftrace_ops trace_ops __initdata = | |
2060 | { | |
2061 | .func = function_test_events_call, | |
4740974a | 2062 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
2063 | }; |
2064 | ||
2065 | static __init void event_trace_self_test_with_function(void) | |
2066 | { | |
17bb615a SR |
2067 | int ret; |
2068 | ret = register_ftrace_function(&trace_ops); | |
2069 | if (WARN_ON(ret < 0)) { | |
2070 | pr_info("Failed to enable function tracer for event tests\n"); | |
2071 | return; | |
2072 | } | |
9ea21c1e SR |
2073 | pr_info("Running tests again, along with the function tracer\n"); |
2074 | event_trace_self_tests(); | |
2075 | unregister_ftrace_function(&trace_ops); | |
2076 | } | |
2077 | #else | |
2078 | static __init void event_trace_self_test_with_function(void) | |
2079 | { | |
2080 | } | |
2081 | #endif | |
2082 | ||
2083 | static __init int event_trace_self_tests_init(void) | |
2084 | { | |
020e5f85 LZ |
2085 | if (!tracing_selftest_disabled) { |
2086 | event_trace_self_tests(); | |
2087 | event_trace_self_test_with_function(); | |
2088 | } | |
e6187007 SR |
2089 | |
2090 | return 0; | |
2091 | } | |
2092 | ||
28d20e2d | 2093 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
2094 | |
2095 | #endif |