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Commit | Line | Data |
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b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
e6187007 SR |
11 | #include <linux/workqueue.h> |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/kthread.h> | |
b77e38aa SR |
14 | #include <linux/debugfs.h> |
15 | #include <linux/uaccess.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/ctype.h> | |
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 | |
d1a29143 SR |
39 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
40 | ||
41 | static struct kmem_cache *field_cachep; | |
42 | static struct kmem_cache *file_cachep; | |
43 | ||
ae63b31e SR |
44 | /* Double loops, do not use break, only goto's work */ |
45 | #define do_for_each_event_file(tr, file) \ | |
46 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
47 | list_for_each_entry(file, &tr->events, list) | |
48 | ||
49 | #define do_for_each_event_file_safe(tr, file) \ | |
50 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
51 | struct ftrace_event_file *___n; \ | |
52 | list_for_each_entry_safe(file, ___n, &tr->events, list) | |
53 | ||
54 | #define while_for_each_event_file() \ | |
55 | } | |
56 | ||
2e33af02 SR |
57 | struct list_head * |
58 | trace_get_fields(struct ftrace_event_call *event_call) | |
59 | { | |
60 | if (!event_call->class->get_fields) | |
61 | return &event_call->class->fields; | |
62 | return event_call->class->get_fields(event_call); | |
63 | } | |
64 | ||
8728fe50 LZ |
65 | static int __trace_define_field(struct list_head *head, const char *type, |
66 | const char *name, int offset, int size, | |
67 | int is_signed, int filter_type) | |
cf027f64 TZ |
68 | { |
69 | struct ftrace_event_field *field; | |
70 | ||
d1a29143 | 71 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 TZ |
72 | if (!field) |
73 | goto err; | |
fe9f57f2 | 74 | |
cf027f64 TZ |
75 | field->name = kstrdup(name, GFP_KERNEL); |
76 | if (!field->name) | |
77 | goto err; | |
fe9f57f2 | 78 | |
cf027f64 TZ |
79 | field->type = kstrdup(type, GFP_KERNEL); |
80 | if (!field->type) | |
81 | goto err; | |
fe9f57f2 | 82 | |
43b51ead LZ |
83 | if (filter_type == FILTER_OTHER) |
84 | field->filter_type = filter_assign_type(type); | |
85 | else | |
86 | field->filter_type = filter_type; | |
87 | ||
cf027f64 TZ |
88 | field->offset = offset; |
89 | field->size = size; | |
a118e4d1 | 90 | field->is_signed = is_signed; |
aa38e9fc | 91 | |
2e33af02 | 92 | list_add(&field->link, head); |
cf027f64 TZ |
93 | |
94 | return 0; | |
fe9f57f2 | 95 | |
cf027f64 | 96 | err: |
7b60997f | 97 | if (field) |
cf027f64 | 98 | kfree(field->name); |
d1a29143 | 99 | kmem_cache_free(field_cachep, field); |
fe9f57f2 | 100 | |
cf027f64 TZ |
101 | return -ENOMEM; |
102 | } | |
8728fe50 LZ |
103 | |
104 | int trace_define_field(struct ftrace_event_call *call, const char *type, | |
105 | const char *name, int offset, int size, int is_signed, | |
106 | int filter_type) | |
107 | { | |
108 | struct list_head *head; | |
109 | ||
110 | if (WARN_ON(!call->class)) | |
111 | return 0; | |
112 | ||
113 | head = trace_get_fields(call); | |
114 | return __trace_define_field(head, type, name, offset, size, | |
115 | is_signed, filter_type); | |
116 | } | |
17c873ec | 117 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 118 | |
e647d6b3 | 119 | #define __common_field(type, item) \ |
8728fe50 LZ |
120 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
121 | "common_" #item, \ | |
122 | offsetof(typeof(ent), item), \ | |
123 | sizeof(ent.item), \ | |
124 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
125 | if (ret) \ |
126 | return ret; | |
127 | ||
8728fe50 | 128 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
129 | { |
130 | int ret; | |
131 | struct trace_entry ent; | |
132 | ||
133 | __common_field(unsigned short, type); | |
134 | __common_field(unsigned char, flags); | |
135 | __common_field(unsigned char, preempt_count); | |
136 | __common_field(int, pid); | |
e647d6b3 LZ |
137 | |
138 | return ret; | |
139 | } | |
140 | ||
bd1a5c84 | 141 | void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
142 | { |
143 | struct ftrace_event_field *field, *next; | |
2e33af02 | 144 | struct list_head *head; |
2df75e41 | 145 | |
2e33af02 SR |
146 | head = trace_get_fields(call); |
147 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 LZ |
148 | list_del(&field->link); |
149 | kfree(field->type); | |
150 | kfree(field->name); | |
d1a29143 | 151 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
152 | } |
153 | } | |
154 | ||
87d9b4e1 LZ |
155 | int trace_event_raw_init(struct ftrace_event_call *call) |
156 | { | |
157 | int id; | |
158 | ||
80decc70 | 159 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
160 | if (!id) |
161 | return -ENODEV; | |
87d9b4e1 LZ |
162 | |
163 | return 0; | |
164 | } | |
165 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
166 | ||
ceec0b6f JO |
167 | int ftrace_event_reg(struct ftrace_event_call *call, |
168 | enum trace_reg type, void *data) | |
a1d0ce82 | 169 | { |
ae63b31e SR |
170 | struct ftrace_event_file *file = data; |
171 | ||
a1d0ce82 SR |
172 | switch (type) { |
173 | case TRACE_REG_REGISTER: | |
174 | return tracepoint_probe_register(call->name, | |
175 | call->class->probe, | |
ae63b31e | 176 | file); |
a1d0ce82 SR |
177 | case TRACE_REG_UNREGISTER: |
178 | tracepoint_probe_unregister(call->name, | |
179 | call->class->probe, | |
ae63b31e | 180 | file); |
a1d0ce82 SR |
181 | return 0; |
182 | ||
183 | #ifdef CONFIG_PERF_EVENTS | |
184 | case TRACE_REG_PERF_REGISTER: | |
185 | return tracepoint_probe_register(call->name, | |
186 | call->class->perf_probe, | |
187 | call); | |
188 | case TRACE_REG_PERF_UNREGISTER: | |
189 | tracepoint_probe_unregister(call->name, | |
190 | call->class->perf_probe, | |
191 | call); | |
192 | return 0; | |
ceec0b6f JO |
193 | case TRACE_REG_PERF_OPEN: |
194 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
195 | case TRACE_REG_PERF_ADD: |
196 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 197 | return 0; |
a1d0ce82 SR |
198 | #endif |
199 | } | |
200 | return 0; | |
201 | } | |
202 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
203 | ||
e870e9a1 LZ |
204 | void trace_event_enable_cmd_record(bool enable) |
205 | { | |
ae63b31e SR |
206 | struct ftrace_event_file *file; |
207 | struct trace_array *tr; | |
e870e9a1 LZ |
208 | |
209 | mutex_lock(&event_mutex); | |
ae63b31e SR |
210 | do_for_each_event_file(tr, file) { |
211 | ||
212 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) | |
e870e9a1 LZ |
213 | continue; |
214 | ||
215 | if (enable) { | |
216 | tracing_start_cmdline_record(); | |
ae63b31e | 217 | file->flags |= FTRACE_EVENT_FL_RECORDED_CMD; |
e870e9a1 LZ |
218 | } else { |
219 | tracing_stop_cmdline_record(); | |
ae63b31e | 220 | file->flags &= ~FTRACE_EVENT_FL_RECORDED_CMD; |
e870e9a1 | 221 | } |
ae63b31e | 222 | } while_for_each_event_file(); |
e870e9a1 LZ |
223 | mutex_unlock(&event_mutex); |
224 | } | |
225 | ||
ae63b31e SR |
226 | static int ftrace_event_enable_disable(struct ftrace_event_file *file, |
227 | int enable) | |
fd994989 | 228 | { |
ae63b31e | 229 | struct ftrace_event_call *call = file->event_call; |
3b8e4273 LZ |
230 | int ret = 0; |
231 | ||
fd994989 SR |
232 | switch (enable) { |
233 | case 0: | |
ae63b31e SR |
234 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
235 | file->flags &= ~FTRACE_EVENT_FL_ENABLED; | |
236 | if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) { | |
e870e9a1 | 237 | tracing_stop_cmdline_record(); |
ae63b31e | 238 | file->flags &= ~FTRACE_EVENT_FL_RECORDED_CMD; |
e870e9a1 | 239 | } |
ae63b31e | 240 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 241 | } |
fd994989 SR |
242 | break; |
243 | case 1: | |
ae63b31e | 244 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) { |
e870e9a1 LZ |
245 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
246 | tracing_start_cmdline_record(); | |
ae63b31e | 247 | file->flags |= FTRACE_EVENT_FL_RECORDED_CMD; |
e870e9a1 | 248 | } |
ae63b31e | 249 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
250 | if (ret) { |
251 | tracing_stop_cmdline_record(); | |
252 | pr_info("event trace: Could not enable event " | |
253 | "%s\n", call->name); | |
254 | break; | |
255 | } | |
ae63b31e | 256 | file->flags |= FTRACE_EVENT_FL_ENABLED; |
fd994989 | 257 | } |
fd994989 SR |
258 | break; |
259 | } | |
3b8e4273 LZ |
260 | |
261 | return ret; | |
fd994989 SR |
262 | } |
263 | ||
ae63b31e | 264 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 265 | { |
ae63b31e | 266 | struct ftrace_event_file *file; |
0e907c99 Z |
267 | |
268 | mutex_lock(&event_mutex); | |
ae63b31e SR |
269 | list_for_each_entry(file, &tr->events, list) { |
270 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
271 | } |
272 | mutex_unlock(&event_mutex); | |
273 | } | |
274 | ||
e9dbfae5 SR |
275 | static void __put_system(struct event_subsystem *system) |
276 | { | |
277 | struct event_filter *filter = system->filter; | |
278 | ||
279 | WARN_ON_ONCE(system->ref_count == 0); | |
280 | if (--system->ref_count) | |
281 | return; | |
282 | ||
ae63b31e SR |
283 | list_del(&system->list); |
284 | ||
e9dbfae5 SR |
285 | if (filter) { |
286 | kfree(filter->filter_string); | |
287 | kfree(filter); | |
288 | } | |
289 | kfree(system->name); | |
290 | kfree(system); | |
291 | } | |
292 | ||
293 | static void __get_system(struct event_subsystem *system) | |
294 | { | |
295 | WARN_ON_ONCE(system->ref_count == 0); | |
296 | system->ref_count++; | |
297 | } | |
298 | ||
ae63b31e SR |
299 | static void __get_system_dir(struct ftrace_subsystem_dir *dir) |
300 | { | |
301 | WARN_ON_ONCE(dir->ref_count == 0); | |
302 | dir->ref_count++; | |
303 | __get_system(dir->subsystem); | |
304 | } | |
305 | ||
306 | static void __put_system_dir(struct ftrace_subsystem_dir *dir) | |
307 | { | |
308 | WARN_ON_ONCE(dir->ref_count == 0); | |
309 | /* If the subsystem is about to be freed, the dir must be too */ | |
310 | WARN_ON_ONCE(dir->subsystem->ref_count == 1 && dir->ref_count != 1); | |
311 | ||
312 | __put_system(dir->subsystem); | |
313 | if (!--dir->ref_count) | |
314 | kfree(dir); | |
315 | } | |
316 | ||
317 | static void put_system(struct ftrace_subsystem_dir *dir) | |
e9dbfae5 SR |
318 | { |
319 | mutex_lock(&event_mutex); | |
ae63b31e | 320 | __put_system_dir(dir); |
e9dbfae5 SR |
321 | mutex_unlock(&event_mutex); |
322 | } | |
323 | ||
8f31bfe5 LZ |
324 | /* |
325 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
326 | */ | |
ae63b31e SR |
327 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, |
328 | const char *sub, const char *event, int set) | |
b77e38aa | 329 | { |
ae63b31e | 330 | struct ftrace_event_file *file; |
a59fd602 | 331 | struct ftrace_event_call *call; |
29f93943 | 332 | int ret = -EINVAL; |
8f31bfe5 LZ |
333 | |
334 | mutex_lock(&event_mutex); | |
ae63b31e SR |
335 | list_for_each_entry(file, &tr->events, list) { |
336 | ||
337 | call = file->event_call; | |
8f31bfe5 | 338 | |
a1d0ce82 | 339 | if (!call->name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
340 | continue; |
341 | ||
9b63776f SR |
342 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
343 | continue; | |
344 | ||
8f31bfe5 LZ |
345 | if (match && |
346 | strcmp(match, call->name) != 0 && | |
8f082018 | 347 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
348 | continue; |
349 | ||
8f082018 | 350 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
351 | continue; |
352 | ||
353 | if (event && strcmp(event, call->name) != 0) | |
354 | continue; | |
355 | ||
ae63b31e | 356 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
357 | |
358 | ret = 0; | |
359 | } | |
360 | mutex_unlock(&event_mutex); | |
361 | ||
362 | return ret; | |
363 | } | |
364 | ||
ae63b31e | 365 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 366 | { |
b628b3e6 | 367 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
368 | |
369 | /* | |
370 | * The buf format can be <subsystem>:<event-name> | |
371 | * *:<event-name> means any event by that name. | |
372 | * :<event-name> is the same. | |
373 | * | |
374 | * <subsystem>:* means all events in that subsystem | |
375 | * <subsystem>: means the same. | |
376 | * | |
377 | * <name> (no ':') means all events in a subsystem with | |
378 | * the name <name> or any event that matches <name> | |
379 | */ | |
380 | ||
381 | match = strsep(&buf, ":"); | |
382 | if (buf) { | |
383 | sub = match; | |
384 | event = buf; | |
385 | match = NULL; | |
386 | ||
387 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
388 | sub = NULL; | |
389 | if (!strlen(event) || strcmp(event, "*") == 0) | |
390 | event = NULL; | |
391 | } | |
b77e38aa | 392 | |
ae63b31e | 393 | return __ftrace_set_clr_event(tr, match, sub, event, set); |
b77e38aa SR |
394 | } |
395 | ||
4671c794 SR |
396 | /** |
397 | * trace_set_clr_event - enable or disable an event | |
398 | * @system: system name to match (NULL for any system) | |
399 | * @event: event name to match (NULL for all events, within system) | |
400 | * @set: 1 to enable, 0 to disable | |
401 | * | |
402 | * This is a way for other parts of the kernel to enable or disable | |
403 | * event recording. | |
404 | * | |
405 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
406 | * registered events. | |
407 | */ | |
408 | int trace_set_clr_event(const char *system, const char *event, int set) | |
409 | { | |
ae63b31e SR |
410 | struct trace_array *tr = top_trace_array(); |
411 | ||
412 | return __ftrace_set_clr_event(tr, NULL, system, event, set); | |
4671c794 | 413 | } |
56355b83 | 414 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 415 | |
b77e38aa SR |
416 | /* 128 should be much more than enough */ |
417 | #define EVENT_BUF_SIZE 127 | |
418 | ||
419 | static ssize_t | |
420 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
421 | size_t cnt, loff_t *ppos) | |
422 | { | |
48966364 | 423 | struct trace_parser parser; |
ae63b31e SR |
424 | struct seq_file *m = file->private_data; |
425 | struct trace_array *tr = m->private; | |
4ba7978e | 426 | ssize_t read, ret; |
b77e38aa | 427 | |
4ba7978e | 428 | if (!cnt) |
b77e38aa SR |
429 | return 0; |
430 | ||
1852fcce SR |
431 | ret = tracing_update_buffers(); |
432 | if (ret < 0) | |
433 | return ret; | |
434 | ||
48966364 | 435 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
436 | return -ENOMEM; |
437 | ||
48966364 | 438 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
439 | ||
4ba7978e | 440 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 441 | int set = 1; |
b77e38aa | 442 | |
48966364 | 443 | if (*parser.buffer == '!') |
b77e38aa | 444 | set = 0; |
b77e38aa | 445 | |
48966364 | 446 | parser.buffer[parser.idx] = 0; |
447 | ||
ae63b31e | 448 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 449 | if (ret) |
48966364 | 450 | goto out_put; |
b77e38aa | 451 | } |
b77e38aa SR |
452 | |
453 | ret = read; | |
454 | ||
48966364 | 455 | out_put: |
456 | trace_parser_put(&parser); | |
b77e38aa SR |
457 | |
458 | return ret; | |
459 | } | |
460 | ||
461 | static void * | |
462 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
463 | { | |
ae63b31e SR |
464 | struct ftrace_event_file *file = v; |
465 | struct ftrace_event_call *call; | |
466 | struct trace_array *tr = m->private; | |
b77e38aa SR |
467 | |
468 | (*pos)++; | |
469 | ||
ae63b31e SR |
470 | list_for_each_entry_continue(file, &tr->events, list) { |
471 | call = file->event_call; | |
40e26815 SR |
472 | /* |
473 | * The ftrace subsystem is for showing formats only. | |
474 | * They can not be enabled or disabled via the event files. | |
475 | */ | |
a1d0ce82 | 476 | if (call->class && call->class->reg) |
ae63b31e | 477 | return file; |
40e26815 | 478 | } |
b77e38aa | 479 | |
30bd39cd | 480 | return NULL; |
b77e38aa SR |
481 | } |
482 | ||
483 | static void *t_start(struct seq_file *m, loff_t *pos) | |
484 | { | |
ae63b31e SR |
485 | struct ftrace_event_file *file; |
486 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
487 | loff_t l; |
488 | ||
20c8928a | 489 | mutex_lock(&event_mutex); |
e1c7e2a6 | 490 | |
ae63b31e | 491 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 492 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
493 | file = t_next(m, file, &l); |
494 | if (!file) | |
e1c7e2a6 LZ |
495 | break; |
496 | } | |
ae63b31e | 497 | return file; |
b77e38aa SR |
498 | } |
499 | ||
500 | static void * | |
501 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
502 | { | |
ae63b31e SR |
503 | struct ftrace_event_file *file = v; |
504 | struct trace_array *tr = m->private; | |
b77e38aa SR |
505 | |
506 | (*pos)++; | |
507 | ||
ae63b31e SR |
508 | list_for_each_entry_continue(file, &tr->events, list) { |
509 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
510 | return file; | |
b77e38aa SR |
511 | } |
512 | ||
30bd39cd | 513 | return NULL; |
b77e38aa SR |
514 | } |
515 | ||
516 | static void *s_start(struct seq_file *m, loff_t *pos) | |
517 | { | |
ae63b31e SR |
518 | struct ftrace_event_file *file; |
519 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
520 | loff_t l; |
521 | ||
20c8928a | 522 | mutex_lock(&event_mutex); |
e1c7e2a6 | 523 | |
ae63b31e | 524 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 525 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
526 | file = s_next(m, file, &l); |
527 | if (!file) | |
e1c7e2a6 LZ |
528 | break; |
529 | } | |
ae63b31e | 530 | return file; |
b77e38aa SR |
531 | } |
532 | ||
533 | static int t_show(struct seq_file *m, void *v) | |
534 | { | |
ae63b31e SR |
535 | struct ftrace_event_file *file = v; |
536 | struct ftrace_event_call *call = file->event_call; | |
b77e38aa | 537 | |
8f082018 SR |
538 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
539 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
540 | seq_printf(m, "%s\n", call->name); |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | static void t_stop(struct seq_file *m, void *p) | |
546 | { | |
20c8928a | 547 | mutex_unlock(&event_mutex); |
b77e38aa SR |
548 | } |
549 | ||
1473e441 SR |
550 | static ssize_t |
551 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
552 | loff_t *ppos) | |
553 | { | |
ae63b31e | 554 | struct ftrace_event_file *file = filp->private_data; |
1473e441 SR |
555 | char *buf; |
556 | ||
ae63b31e | 557 | if (file->flags & FTRACE_EVENT_FL_ENABLED) |
1473e441 SR |
558 | buf = "1\n"; |
559 | else | |
560 | buf = "0\n"; | |
561 | ||
562 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
563 | } | |
564 | ||
565 | static ssize_t | |
566 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
567 | loff_t *ppos) | |
568 | { | |
ae63b31e | 569 | struct ftrace_event_file *file = filp->private_data; |
1473e441 SR |
570 | unsigned long val; |
571 | int ret; | |
572 | ||
ae63b31e SR |
573 | if (!file) |
574 | return -EINVAL; | |
575 | ||
22fe9b54 PH |
576 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
577 | if (ret) | |
1473e441 SR |
578 | return ret; |
579 | ||
1852fcce SR |
580 | ret = tracing_update_buffers(); |
581 | if (ret < 0) | |
582 | return ret; | |
583 | ||
1473e441 SR |
584 | switch (val) { |
585 | case 0: | |
1473e441 | 586 | case 1: |
11a241a3 | 587 | mutex_lock(&event_mutex); |
ae63b31e | 588 | ret = ftrace_event_enable_disable(file, val); |
11a241a3 | 589 | mutex_unlock(&event_mutex); |
1473e441 SR |
590 | break; |
591 | ||
592 | default: | |
593 | return -EINVAL; | |
594 | } | |
595 | ||
596 | *ppos += cnt; | |
597 | ||
3b8e4273 | 598 | return ret ? ret : cnt; |
1473e441 SR |
599 | } |
600 | ||
8ae79a13 SR |
601 | static ssize_t |
602 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
603 | loff_t *ppos) | |
604 | { | |
c142b15d | 605 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
ae63b31e SR |
606 | struct ftrace_subsystem_dir *dir = filp->private_data; |
607 | struct event_subsystem *system = dir->subsystem; | |
8ae79a13 | 608 | struct ftrace_event_call *call; |
ae63b31e SR |
609 | struct ftrace_event_file *file; |
610 | struct trace_array *tr = dir->tr; | |
8ae79a13 | 611 | char buf[2]; |
c142b15d | 612 | int set = 0; |
8ae79a13 SR |
613 | int ret; |
614 | ||
8ae79a13 | 615 | mutex_lock(&event_mutex); |
ae63b31e SR |
616 | list_for_each_entry(file, &tr->events, list) { |
617 | call = file->event_call; | |
a1d0ce82 | 618 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
619 | continue; |
620 | ||
40ee4dff | 621 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
622 | continue; |
623 | ||
624 | /* | |
625 | * We need to find out if all the events are set | |
626 | * or if all events or cleared, or if we have | |
627 | * a mixture. | |
628 | */ | |
ae63b31e | 629 | set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED)); |
c142b15d | 630 | |
8ae79a13 SR |
631 | /* |
632 | * If we have a mixture, no need to look further. | |
633 | */ | |
c142b15d | 634 | if (set == 3) |
8ae79a13 SR |
635 | break; |
636 | } | |
637 | mutex_unlock(&event_mutex); | |
638 | ||
c142b15d | 639 | buf[0] = set_to_char[set]; |
8ae79a13 | 640 | buf[1] = '\n'; |
8ae79a13 SR |
641 | |
642 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
643 | ||
644 | return ret; | |
645 | } | |
646 | ||
647 | static ssize_t | |
648 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
649 | loff_t *ppos) | |
650 | { | |
ae63b31e SR |
651 | struct ftrace_subsystem_dir *dir = filp->private_data; |
652 | struct event_subsystem *system = dir->subsystem; | |
40ee4dff | 653 | const char *name = NULL; |
8ae79a13 | 654 | unsigned long val; |
8ae79a13 SR |
655 | ssize_t ret; |
656 | ||
22fe9b54 PH |
657 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
658 | if (ret) | |
8ae79a13 SR |
659 | return ret; |
660 | ||
661 | ret = tracing_update_buffers(); | |
662 | if (ret < 0) | |
663 | return ret; | |
664 | ||
8f31bfe5 | 665 | if (val != 0 && val != 1) |
8ae79a13 | 666 | return -EINVAL; |
8ae79a13 | 667 | |
40ee4dff SR |
668 | /* |
669 | * Opening of "enable" adds a ref count to system, | |
670 | * so the name is safe to use. | |
671 | */ | |
672 | if (system) | |
673 | name = system->name; | |
674 | ||
ae63b31e | 675 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 676 | if (ret) |
8f31bfe5 | 677 | goto out; |
8ae79a13 SR |
678 | |
679 | ret = cnt; | |
680 | ||
8f31bfe5 | 681 | out: |
8ae79a13 SR |
682 | *ppos += cnt; |
683 | ||
684 | return ret; | |
685 | } | |
686 | ||
2a37a3df SR |
687 | enum { |
688 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
689 | FORMAT_FIELD_SEPERATOR = 2, |
690 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
691 | }; |
692 | ||
693 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 694 | { |
2a37a3df | 695 | struct ftrace_event_call *call = m->private; |
5a65e956 | 696 | struct ftrace_event_field *field; |
86397dc3 LZ |
697 | struct list_head *common_head = &ftrace_common_fields; |
698 | struct list_head *head = trace_get_fields(call); | |
981d081e | 699 | |
2a37a3df | 700 | (*pos)++; |
5a65e956 | 701 | |
2a37a3df SR |
702 | switch ((unsigned long)v) { |
703 | case FORMAT_HEADER: | |
86397dc3 LZ |
704 | if (unlikely(list_empty(common_head))) |
705 | return NULL; | |
706 | ||
707 | field = list_entry(common_head->prev, | |
708 | struct ftrace_event_field, link); | |
709 | return field; | |
5a65e956 | 710 | |
86397dc3 | 711 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
712 | if (unlikely(list_empty(head))) |
713 | return NULL; | |
5a65e956 | 714 | |
2a37a3df SR |
715 | field = list_entry(head->prev, struct ftrace_event_field, link); |
716 | return field; | |
5a65e956 | 717 | |
2a37a3df SR |
718 | case FORMAT_PRINTFMT: |
719 | /* all done */ | |
720 | return NULL; | |
5a65e956 LJ |
721 | } |
722 | ||
2a37a3df | 723 | field = v; |
86397dc3 LZ |
724 | if (field->link.prev == common_head) |
725 | return (void *)FORMAT_FIELD_SEPERATOR; | |
726 | else if (field->link.prev == head) | |
2a37a3df SR |
727 | return (void *)FORMAT_PRINTFMT; |
728 | ||
729 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
730 | ||
2a37a3df | 731 | return field; |
8728fe50 | 732 | } |
5a65e956 | 733 | |
2a37a3df | 734 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 735 | { |
2a37a3df SR |
736 | loff_t l = 0; |
737 | void *p; | |
5a65e956 | 738 | |
2a37a3df SR |
739 | /* Start by showing the header */ |
740 | if (!*pos) | |
741 | return (void *)FORMAT_HEADER; | |
742 | ||
743 | p = (void *)FORMAT_HEADER; | |
744 | do { | |
745 | p = f_next(m, p, &l); | |
746 | } while (p && l < *pos); | |
747 | ||
748 | return p; | |
749 | } | |
750 | ||
751 | static int f_show(struct seq_file *m, void *v) | |
752 | { | |
753 | struct ftrace_event_call *call = m->private; | |
754 | struct ftrace_event_field *field; | |
755 | const char *array_descriptor; | |
756 | ||
757 | switch ((unsigned long)v) { | |
758 | case FORMAT_HEADER: | |
759 | seq_printf(m, "name: %s\n", call->name); | |
760 | seq_printf(m, "ID: %d\n", call->event.type); | |
761 | seq_printf(m, "format:\n"); | |
8728fe50 | 762 | return 0; |
5a65e956 | 763 | |
86397dc3 LZ |
764 | case FORMAT_FIELD_SEPERATOR: |
765 | seq_putc(m, '\n'); | |
766 | return 0; | |
767 | ||
2a37a3df SR |
768 | case FORMAT_PRINTFMT: |
769 | seq_printf(m, "\nprint fmt: %s\n", | |
770 | call->print_fmt); | |
771 | return 0; | |
981d081e | 772 | } |
8728fe50 | 773 | |
2a37a3df | 774 | field = v; |
8728fe50 | 775 | |
2a37a3df SR |
776 | /* |
777 | * Smartly shows the array type(except dynamic array). | |
778 | * Normal: | |
779 | * field:TYPE VAR | |
780 | * If TYPE := TYPE[LEN], it is shown: | |
781 | * field:TYPE VAR[LEN] | |
782 | */ | |
783 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 784 | |
2a37a3df SR |
785 | if (!strncmp(field->type, "__data_loc", 10)) |
786 | array_descriptor = NULL; | |
8728fe50 | 787 | |
2a37a3df SR |
788 | if (!array_descriptor) |
789 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
790 | field->type, field->name, field->offset, | |
791 | field->size, !!field->is_signed); | |
792 | else | |
793 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
794 | (int)(array_descriptor - field->type), | |
795 | field->type, field->name, | |
796 | array_descriptor, field->offset, | |
797 | field->size, !!field->is_signed); | |
8728fe50 | 798 | |
2a37a3df SR |
799 | return 0; |
800 | } | |
5a65e956 | 801 | |
2a37a3df SR |
802 | static void f_stop(struct seq_file *m, void *p) |
803 | { | |
804 | } | |
981d081e | 805 | |
2a37a3df SR |
806 | static const struct seq_operations trace_format_seq_ops = { |
807 | .start = f_start, | |
808 | .next = f_next, | |
809 | .stop = f_stop, | |
810 | .show = f_show, | |
811 | }; | |
812 | ||
813 | static int trace_format_open(struct inode *inode, struct file *file) | |
814 | { | |
815 | struct ftrace_event_call *call = inode->i_private; | |
816 | struct seq_file *m; | |
817 | int ret; | |
818 | ||
819 | ret = seq_open(file, &trace_format_seq_ops); | |
820 | if (ret < 0) | |
821 | return ret; | |
822 | ||
823 | m = file->private_data; | |
824 | m->private = call; | |
825 | ||
826 | return 0; | |
981d081e SR |
827 | } |
828 | ||
23725aee PZ |
829 | static ssize_t |
830 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
831 | { | |
832 | struct ftrace_event_call *call = filp->private_data; | |
833 | struct trace_seq *s; | |
834 | int r; | |
835 | ||
836 | if (*ppos) | |
837 | return 0; | |
838 | ||
839 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
840 | if (!s) | |
841 | return -ENOMEM; | |
842 | ||
843 | trace_seq_init(s); | |
32c0edae | 844 | trace_seq_printf(s, "%d\n", call->event.type); |
23725aee PZ |
845 | |
846 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
847 | s->buffer, s->len); | |
848 | kfree(s); | |
849 | return r; | |
850 | } | |
851 | ||
7ce7e424 TZ |
852 | static ssize_t |
853 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
854 | loff_t *ppos) | |
855 | { | |
856 | struct ftrace_event_call *call = filp->private_data; | |
857 | struct trace_seq *s; | |
858 | int r; | |
859 | ||
860 | if (*ppos) | |
861 | return 0; | |
862 | ||
863 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
864 | if (!s) | |
865 | return -ENOMEM; | |
866 | ||
867 | trace_seq_init(s); | |
868 | ||
8b372562 | 869 | print_event_filter(call, s); |
4bda2d51 | 870 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
7ce7e424 TZ |
871 | |
872 | kfree(s); | |
873 | ||
874 | return r; | |
875 | } | |
876 | ||
877 | static ssize_t | |
878 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
879 | loff_t *ppos) | |
880 | { | |
881 | struct ftrace_event_call *call = filp->private_data; | |
8b372562 | 882 | char *buf; |
7ce7e424 TZ |
883 | int err; |
884 | ||
8b372562 | 885 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
886 | return -EINVAL; |
887 | ||
8b372562 TZ |
888 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
889 | if (!buf) | |
7ce7e424 TZ |
890 | return -ENOMEM; |
891 | ||
8b372562 TZ |
892 | if (copy_from_user(buf, ubuf, cnt)) { |
893 | free_page((unsigned long) buf); | |
894 | return -EFAULT; | |
7ce7e424 | 895 | } |
8b372562 | 896 | buf[cnt] = '\0'; |
7ce7e424 | 897 | |
8b372562 TZ |
898 | err = apply_event_filter(call, buf); |
899 | free_page((unsigned long) buf); | |
900 | if (err < 0) | |
44e9c8b7 | 901 | return err; |
0a19e53c | 902 | |
7ce7e424 TZ |
903 | *ppos += cnt; |
904 | ||
905 | return cnt; | |
906 | } | |
907 | ||
e9dbfae5 SR |
908 | static LIST_HEAD(event_subsystems); |
909 | ||
910 | static int subsystem_open(struct inode *inode, struct file *filp) | |
911 | { | |
912 | struct event_subsystem *system = NULL; | |
ae63b31e SR |
913 | struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
914 | struct trace_array *tr; | |
e9dbfae5 SR |
915 | int ret; |
916 | ||
917 | /* Make sure the system still exists */ | |
918 | mutex_lock(&event_mutex); | |
ae63b31e SR |
919 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
920 | list_for_each_entry(dir, &tr->systems, list) { | |
921 | if (dir == inode->i_private) { | |
922 | /* Don't open systems with no events */ | |
923 | if (dir->nr_events) { | |
924 | __get_system_dir(dir); | |
925 | system = dir->subsystem; | |
926 | } | |
927 | goto exit_loop; | |
e9dbfae5 | 928 | } |
e9dbfae5 SR |
929 | } |
930 | } | |
ae63b31e | 931 | exit_loop: |
e9dbfae5 SR |
932 | mutex_unlock(&event_mutex); |
933 | ||
ae63b31e | 934 | if (!system) |
e9dbfae5 SR |
935 | return -ENODEV; |
936 | ||
ae63b31e SR |
937 | /* Some versions of gcc think dir can be uninitialized here */ |
938 | WARN_ON(!dir); | |
939 | ||
e9dbfae5 | 940 | ret = tracing_open_generic(inode, filp); |
ae63b31e SR |
941 | if (ret < 0) |
942 | put_system(dir); | |
943 | ||
944 | return ret; | |
945 | } | |
946 | ||
947 | static int system_tr_open(struct inode *inode, struct file *filp) | |
948 | { | |
949 | struct ftrace_subsystem_dir *dir; | |
950 | struct trace_array *tr = inode->i_private; | |
951 | int ret; | |
952 | ||
953 | /* Make a temporary dir that has no system but points to tr */ | |
954 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
955 | if (!dir) | |
956 | return -ENOMEM; | |
957 | ||
958 | dir->tr = tr; | |
959 | ||
960 | ret = tracing_open_generic(inode, filp); | |
961 | if (ret < 0) | |
962 | kfree(dir); | |
963 | ||
964 | filp->private_data = dir; | |
e9dbfae5 SR |
965 | |
966 | return ret; | |
967 | } | |
968 | ||
969 | static int subsystem_release(struct inode *inode, struct file *file) | |
970 | { | |
ae63b31e | 971 | struct ftrace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 972 | |
ae63b31e SR |
973 | /* |
974 | * If dir->subsystem is NULL, then this is a temporary | |
975 | * descriptor that was made for a trace_array to enable | |
976 | * all subsystems. | |
977 | */ | |
978 | if (dir->subsystem) | |
979 | put_system(dir); | |
980 | else | |
981 | kfree(dir); | |
e9dbfae5 SR |
982 | |
983 | return 0; | |
984 | } | |
985 | ||
cfb180f3 TZ |
986 | static ssize_t |
987 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
988 | loff_t *ppos) | |
989 | { | |
ae63b31e SR |
990 | struct ftrace_subsystem_dir *dir = filp->private_data; |
991 | struct event_subsystem *system = dir->subsystem; | |
cfb180f3 TZ |
992 | struct trace_seq *s; |
993 | int r; | |
994 | ||
995 | if (*ppos) | |
996 | return 0; | |
997 | ||
998 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
999 | if (!s) | |
1000 | return -ENOMEM; | |
1001 | ||
1002 | trace_seq_init(s); | |
1003 | ||
8b372562 | 1004 | print_subsystem_event_filter(system, s); |
4bda2d51 | 1005 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
1006 | |
1007 | kfree(s); | |
1008 | ||
1009 | return r; | |
1010 | } | |
1011 | ||
1012 | static ssize_t | |
1013 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1014 | loff_t *ppos) | |
1015 | { | |
ae63b31e | 1016 | struct ftrace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1017 | char *buf; |
cfb180f3 TZ |
1018 | int err; |
1019 | ||
8b372562 | 1020 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1021 | return -EINVAL; |
1022 | ||
8b372562 TZ |
1023 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1024 | if (!buf) | |
cfb180f3 TZ |
1025 | return -ENOMEM; |
1026 | ||
8b372562 TZ |
1027 | if (copy_from_user(buf, ubuf, cnt)) { |
1028 | free_page((unsigned long) buf); | |
1029 | return -EFAULT; | |
cfb180f3 | 1030 | } |
8b372562 | 1031 | buf[cnt] = '\0'; |
cfb180f3 | 1032 | |
ae63b31e | 1033 | err = apply_subsystem_event_filter(dir, buf); |
8b372562 TZ |
1034 | free_page((unsigned long) buf); |
1035 | if (err < 0) | |
44e9c8b7 | 1036 | return err; |
cfb180f3 TZ |
1037 | |
1038 | *ppos += cnt; | |
1039 | ||
1040 | return cnt; | |
1041 | } | |
1042 | ||
d1b182a8 SR |
1043 | static ssize_t |
1044 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1045 | { | |
1046 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1047 | struct trace_seq *s; | |
1048 | int r; | |
1049 | ||
1050 | if (*ppos) | |
1051 | return 0; | |
1052 | ||
1053 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1054 | if (!s) | |
1055 | return -ENOMEM; | |
1056 | ||
1057 | trace_seq_init(s); | |
1058 | ||
1059 | func(s); | |
1060 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
1061 | ||
1062 | kfree(s); | |
1063 | ||
1064 | return r; | |
1065 | } | |
1066 | ||
15075cac SR |
1067 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1068 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
1069 | ||
b77e38aa SR |
1070 | static const struct seq_operations show_event_seq_ops = { |
1071 | .start = t_start, | |
1072 | .next = t_next, | |
1073 | .show = t_show, | |
1074 | .stop = t_stop, | |
1075 | }; | |
1076 | ||
1077 | static const struct seq_operations show_set_event_seq_ops = { | |
1078 | .start = s_start, | |
1079 | .next = s_next, | |
1080 | .show = t_show, | |
1081 | .stop = t_stop, | |
1082 | }; | |
1083 | ||
2314c4ae | 1084 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1085 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1086 | .read = seq_read, |
1087 | .llseek = seq_lseek, | |
1088 | .release = seq_release, | |
1089 | }; | |
1090 | ||
b77e38aa | 1091 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1092 | .open = ftrace_event_set_open, |
b77e38aa SR |
1093 | .read = seq_read, |
1094 | .write = ftrace_event_write, | |
1095 | .llseek = seq_lseek, | |
1096 | .release = seq_release, | |
1097 | }; | |
1098 | ||
1473e441 SR |
1099 | static const struct file_operations ftrace_enable_fops = { |
1100 | .open = tracing_open_generic, | |
1101 | .read = event_enable_read, | |
1102 | .write = event_enable_write, | |
6038f373 | 1103 | .llseek = default_llseek, |
1473e441 SR |
1104 | }; |
1105 | ||
981d081e | 1106 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1107 | .open = trace_format_open, |
1108 | .read = seq_read, | |
1109 | .llseek = seq_lseek, | |
1110 | .release = seq_release, | |
981d081e SR |
1111 | }; |
1112 | ||
23725aee PZ |
1113 | static const struct file_operations ftrace_event_id_fops = { |
1114 | .open = tracing_open_generic, | |
1115 | .read = event_id_read, | |
6038f373 | 1116 | .llseek = default_llseek, |
23725aee PZ |
1117 | }; |
1118 | ||
7ce7e424 TZ |
1119 | static const struct file_operations ftrace_event_filter_fops = { |
1120 | .open = tracing_open_generic, | |
1121 | .read = event_filter_read, | |
1122 | .write = event_filter_write, | |
6038f373 | 1123 | .llseek = default_llseek, |
7ce7e424 TZ |
1124 | }; |
1125 | ||
cfb180f3 | 1126 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1127 | .open = subsystem_open, |
cfb180f3 TZ |
1128 | .read = subsystem_filter_read, |
1129 | .write = subsystem_filter_write, | |
6038f373 | 1130 | .llseek = default_llseek, |
e9dbfae5 | 1131 | .release = subsystem_release, |
cfb180f3 TZ |
1132 | }; |
1133 | ||
8ae79a13 | 1134 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1135 | .open = subsystem_open, |
8ae79a13 SR |
1136 | .read = system_enable_read, |
1137 | .write = system_enable_write, | |
6038f373 | 1138 | .llseek = default_llseek, |
40ee4dff | 1139 | .release = subsystem_release, |
8ae79a13 SR |
1140 | }; |
1141 | ||
ae63b31e SR |
1142 | static const struct file_operations ftrace_tr_enable_fops = { |
1143 | .open = system_tr_open, | |
1144 | .read = system_enable_read, | |
1145 | .write = system_enable_write, | |
1146 | .llseek = default_llseek, | |
1147 | .release = subsystem_release, | |
1148 | }; | |
1149 | ||
d1b182a8 SR |
1150 | static const struct file_operations ftrace_show_header_fops = { |
1151 | .open = tracing_open_generic, | |
1152 | .read = show_header, | |
6038f373 | 1153 | .llseek = default_llseek, |
d1b182a8 SR |
1154 | }; |
1155 | ||
ae63b31e SR |
1156 | static int |
1157 | ftrace_event_open(struct inode *inode, struct file *file, | |
1158 | const struct seq_operations *seq_ops) | |
1473e441 | 1159 | { |
ae63b31e SR |
1160 | struct seq_file *m; |
1161 | int ret; | |
1473e441 | 1162 | |
ae63b31e SR |
1163 | ret = seq_open(file, seq_ops); |
1164 | if (ret < 0) | |
1165 | return ret; | |
1166 | m = file->private_data; | |
1167 | /* copy tr over to seq ops */ | |
1168 | m->private = inode->i_private; | |
1473e441 | 1169 | |
ae63b31e | 1170 | return ret; |
1473e441 SR |
1171 | } |
1172 | ||
15075cac SR |
1173 | static int |
1174 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1175 | { | |
1176 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1177 | ||
ae63b31e | 1178 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1179 | } |
1180 | ||
1181 | static int | |
1182 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1183 | { | |
1184 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1185 | struct trace_array *tr = inode->i_private; |
15075cac SR |
1186 | |
1187 | if ((file->f_mode & FMODE_WRITE) && | |
1188 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1189 | ftrace_clear_events(tr); |
15075cac | 1190 | |
ae63b31e SR |
1191 | return ftrace_event_open(inode, file, seq_ops); |
1192 | } | |
1193 | ||
1194 | static struct event_subsystem * | |
1195 | create_new_subsystem(const char *name) | |
1196 | { | |
1197 | struct event_subsystem *system; | |
1198 | ||
1199 | /* need to create new entry */ | |
1200 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1201 | if (!system) | |
1202 | return NULL; | |
1203 | ||
1204 | system->ref_count = 1; | |
1205 | system->name = kstrdup(name, GFP_KERNEL); | |
1206 | ||
1207 | if (!system->name) | |
1208 | goto out_free; | |
1209 | ||
1210 | system->filter = NULL; | |
1211 | ||
1212 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1213 | if (!system->filter) | |
1214 | goto out_free; | |
1215 | ||
1216 | list_add(&system->list, &event_subsystems); | |
1217 | ||
1218 | return system; | |
1219 | ||
1220 | out_free: | |
1221 | kfree(system->name); | |
1222 | kfree(system); | |
1223 | return NULL; | |
15075cac SR |
1224 | } |
1225 | ||
6ecc2d1c | 1226 | static struct dentry * |
ae63b31e SR |
1227 | event_subsystem_dir(struct trace_array *tr, const char *name, |
1228 | struct ftrace_event_file *file, struct dentry *parent) | |
6ecc2d1c | 1229 | { |
ae63b31e | 1230 | struct ftrace_subsystem_dir *dir; |
6ecc2d1c | 1231 | struct event_subsystem *system; |
e1112b4d | 1232 | struct dentry *entry; |
6ecc2d1c SR |
1233 | |
1234 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1235 | list_for_each_entry(dir, &tr->systems, list) { |
1236 | system = dir->subsystem; | |
dc82ec98 | 1237 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1238 | dir->nr_events++; |
1239 | file->system = dir; | |
1240 | return dir->entry; | |
dc82ec98 | 1241 | } |
6ecc2d1c SR |
1242 | } |
1243 | ||
ae63b31e SR |
1244 | /* Now see if the system itself exists. */ |
1245 | list_for_each_entry(system, &event_subsystems, list) { | |
1246 | if (strcmp(system->name, name) == 0) | |
1247 | break; | |
6ecc2d1c | 1248 | } |
ae63b31e SR |
1249 | /* Reset system variable when not found */ |
1250 | if (&system->list == &event_subsystems) | |
1251 | system = NULL; | |
6ecc2d1c | 1252 | |
ae63b31e SR |
1253 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1254 | if (!dir) | |
1255 | goto out_fail; | |
6ecc2d1c | 1256 | |
ae63b31e SR |
1257 | if (!system) { |
1258 | system = create_new_subsystem(name); | |
1259 | if (!system) | |
1260 | goto out_free; | |
1261 | } else | |
1262 | __get_system(system); | |
1263 | ||
1264 | dir->entry = debugfs_create_dir(name, parent); | |
1265 | if (!dir->entry) { | |
1266 | pr_warning("Failed to create system directory %s\n", name); | |
1267 | __put_system(system); | |
1268 | goto out_free; | |
6d723736 SR |
1269 | } |
1270 | ||
ae63b31e SR |
1271 | dir->tr = tr; |
1272 | dir->ref_count = 1; | |
1273 | dir->nr_events = 1; | |
1274 | dir->subsystem = system; | |
1275 | file->system = dir; | |
8b372562 | 1276 | |
ae63b31e | 1277 | entry = debugfs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1278 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1279 | if (!entry) { |
1280 | kfree(system->filter); | |
1281 | system->filter = NULL; | |
ae63b31e | 1282 | pr_warning("Could not create debugfs '%s/filter' entry\n", name); |
8b372562 | 1283 | } |
e1112b4d | 1284 | |
ae63b31e | 1285 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1286 | &ftrace_system_enable_fops); |
8ae79a13 | 1287 | |
ae63b31e SR |
1288 | list_add(&dir->list, &tr->systems); |
1289 | ||
1290 | return dir->entry; | |
1291 | ||
1292 | out_free: | |
1293 | kfree(dir); | |
1294 | out_fail: | |
1295 | /* Only print this message if failed on memory allocation */ | |
1296 | if (!dir || !system) | |
1297 | pr_warning("No memory to create event subsystem %s\n", | |
1298 | name); | |
1299 | return NULL; | |
6ecc2d1c SR |
1300 | } |
1301 | ||
1473e441 | 1302 | static int |
ae63b31e SR |
1303 | event_create_dir(struct dentry *parent, |
1304 | struct ftrace_event_file *file, | |
701970b3 SR |
1305 | const struct file_operations *id, |
1306 | const struct file_operations *enable, | |
1307 | const struct file_operations *filter, | |
1308 | const struct file_operations *format) | |
1473e441 | 1309 | { |
ae63b31e SR |
1310 | struct ftrace_event_call *call = file->event_call; |
1311 | struct trace_array *tr = file->tr; | |
2e33af02 | 1312 | struct list_head *head; |
ae63b31e | 1313 | struct dentry *d_events; |
fd994989 | 1314 | int ret; |
1473e441 | 1315 | |
6ecc2d1c SR |
1316 | /* |
1317 | * If the trace point header did not define TRACE_SYSTEM | |
1318 | * then the system would be called "TRACE_SYSTEM". | |
1319 | */ | |
ae63b31e SR |
1320 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1321 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1322 | if (!d_events) | |
1323 | return -ENOMEM; | |
1324 | } else | |
1325 | d_events = parent; | |
1326 | ||
1327 | file->dir = debugfs_create_dir(call->name, d_events); | |
1328 | if (!file->dir) { | |
1329 | pr_warning("Could not create debugfs '%s' directory\n", | |
1330 | call->name); | |
1473e441 SR |
1331 | return -1; |
1332 | } | |
1333 | ||
9b63776f | 1334 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1335 | trace_create_file("enable", 0644, file->dir, file, |
f3f3f009 | 1336 | enable); |
1473e441 | 1337 | |
2239291a | 1338 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1339 | if (call->event.type && call->class->reg) |
ae63b31e | 1340 | trace_create_file("id", 0444, file->dir, call, |
f3f3f009 | 1341 | id); |
2239291a | 1342 | #endif |
23725aee | 1343 | |
c9d932cf LZ |
1344 | /* |
1345 | * Other events may have the same class. Only update | |
1346 | * the fields if they are not already defined. | |
1347 | */ | |
1348 | head = trace_get_fields(call); | |
1349 | if (list_empty(head)) { | |
1350 | ret = call->class->define_fields(call); | |
1351 | if (ret < 0) { | |
1352 | pr_warning("Could not initialize trace point" | |
1353 | " events/%s\n", call->name); | |
ae63b31e | 1354 | return -1; |
cf027f64 TZ |
1355 | } |
1356 | } | |
ae63b31e | 1357 | trace_create_file("filter", 0644, file->dir, call, |
c9d932cf | 1358 | filter); |
cf027f64 | 1359 | |
ae63b31e | 1360 | trace_create_file("format", 0444, file->dir, call, |
f3f3f009 | 1361 | format); |
6d723736 SR |
1362 | |
1363 | return 0; | |
1364 | } | |
1365 | ||
ae63b31e SR |
1366 | static void remove_subsystem(struct ftrace_subsystem_dir *dir) |
1367 | { | |
1368 | if (!dir) | |
1369 | return; | |
1370 | ||
1371 | if (!--dir->nr_events) { | |
1372 | debugfs_remove_recursive(dir->entry); | |
1373 | list_del(&dir->list); | |
1374 | __put_system_dir(dir); | |
1375 | } | |
1376 | } | |
1377 | ||
1378 | static void remove_event_from_tracers(struct ftrace_event_call *call) | |
1379 | { | |
1380 | struct ftrace_event_file *file; | |
1381 | struct trace_array *tr; | |
1382 | ||
1383 | do_for_each_event_file_safe(tr, file) { | |
1384 | ||
1385 | if (file->event_call != call) | |
1386 | continue; | |
1387 | ||
1388 | list_del(&file->list); | |
1389 | debugfs_remove_recursive(file->dir); | |
1390 | remove_subsystem(file->system); | |
d1a29143 | 1391 | kmem_cache_free(file_cachep, file); |
ae63b31e SR |
1392 | |
1393 | /* | |
1394 | * The do_for_each_event_file_safe() is | |
1395 | * a double loop. After finding the call for this | |
1396 | * trace_array, we use break to jump to the next | |
1397 | * trace_array. | |
1398 | */ | |
1399 | break; | |
1400 | } while_for_each_event_file(); | |
1401 | } | |
1402 | ||
8781915a EG |
1403 | static void event_remove(struct ftrace_event_call *call) |
1404 | { | |
ae63b31e SR |
1405 | struct trace_array *tr; |
1406 | struct ftrace_event_file *file; | |
1407 | ||
1408 | do_for_each_event_file(tr, file) { | |
1409 | if (file->event_call != call) | |
1410 | continue; | |
1411 | ftrace_event_enable_disable(file, 0); | |
1412 | /* | |
1413 | * The do_for_each_event_file() is | |
1414 | * a double loop. After finding the call for this | |
1415 | * trace_array, we use break to jump to the next | |
1416 | * trace_array. | |
1417 | */ | |
1418 | break; | |
1419 | } while_for_each_event_file(); | |
1420 | ||
8781915a EG |
1421 | if (call->event.funcs) |
1422 | __unregister_ftrace_event(&call->event); | |
ae63b31e | 1423 | remove_event_from_tracers(call); |
8781915a EG |
1424 | list_del(&call->list); |
1425 | } | |
1426 | ||
1427 | static int event_init(struct ftrace_event_call *call) | |
1428 | { | |
1429 | int ret = 0; | |
1430 | ||
1431 | if (WARN_ON(!call->name)) | |
1432 | return -EINVAL; | |
1433 | ||
1434 | if (call->class->raw_init) { | |
1435 | ret = call->class->raw_init(call); | |
1436 | if (ret < 0 && ret != -ENOSYS) | |
1437 | pr_warn("Could not initialize trace events/%s\n", | |
1438 | call->name); | |
1439 | } | |
1440 | ||
1441 | return ret; | |
1442 | } | |
1443 | ||
67ead0a6 | 1444 | static int |
ae63b31e | 1445 | __register_event(struct ftrace_event_call *call, struct module *mod) |
bd1a5c84 | 1446 | { |
bd1a5c84 | 1447 | int ret; |
6d723736 | 1448 | |
8781915a EG |
1449 | ret = event_init(call); |
1450 | if (ret < 0) | |
1451 | return ret; | |
701970b3 | 1452 | |
ae63b31e | 1453 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 1454 | call->mod = mod; |
88f70d75 | 1455 | |
ae63b31e | 1456 | return 0; |
bd1a5c84 MH |
1457 | } |
1458 | ||
ae63b31e SR |
1459 | /* Add an event to a trace directory */ |
1460 | static int | |
1461 | __trace_add_new_event(struct ftrace_event_call *call, | |
1462 | struct trace_array *tr, | |
1463 | const struct file_operations *id, | |
1464 | const struct file_operations *enable, | |
1465 | const struct file_operations *filter, | |
1466 | const struct file_operations *format) | |
1467 | { | |
1468 | struct ftrace_event_file *file; | |
1469 | ||
d1a29143 | 1470 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); |
ae63b31e SR |
1471 | if (!file) |
1472 | return -ENOMEM; | |
1473 | ||
1474 | file->event_call = call; | |
1475 | file->tr = tr; | |
1476 | list_add(&file->list, &tr->events); | |
1477 | ||
1478 | return event_create_dir(tr->event_dir, file, id, enable, filter, format); | |
1479 | } | |
1480 | ||
77248221 SR |
1481 | /* |
1482 | * Just create a decriptor for early init. A descriptor is required | |
1483 | * for enabling events at boot. We want to enable events before | |
1484 | * the filesystem is initialized. | |
1485 | */ | |
1486 | static __init int | |
1487 | __trace_early_add_new_event(struct ftrace_event_call *call, | |
1488 | struct trace_array *tr) | |
1489 | { | |
1490 | struct ftrace_event_file *file; | |
1491 | ||
d1a29143 | 1492 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); |
77248221 SR |
1493 | if (!file) |
1494 | return -ENOMEM; | |
1495 | ||
1496 | file->event_call = call; | |
1497 | file->tr = tr; | |
1498 | list_add(&file->list, &tr->events); | |
1499 | ||
1500 | return 0; | |
1501 | } | |
1502 | ||
ae63b31e SR |
1503 | struct ftrace_module_file_ops; |
1504 | static void __add_event_to_tracers(struct ftrace_event_call *call, | |
1505 | struct ftrace_module_file_ops *file_ops); | |
1506 | ||
bd1a5c84 MH |
1507 | /* Add an additional event_call dynamically */ |
1508 | int trace_add_event_call(struct ftrace_event_call *call) | |
1509 | { | |
1510 | int ret; | |
1511 | mutex_lock(&event_mutex); | |
701970b3 | 1512 | |
ae63b31e SR |
1513 | ret = __register_event(call, NULL); |
1514 | if (ret >= 0) | |
1515 | __add_event_to_tracers(call, NULL); | |
a2ca5e03 | 1516 | |
ae63b31e SR |
1517 | mutex_unlock(&event_mutex); |
1518 | return ret; | |
a2ca5e03 FW |
1519 | } |
1520 | ||
4fead8e4 MH |
1521 | /* |
1522 | * Must be called under locking both of event_mutex and trace_event_mutex. | |
1523 | */ | |
bd1a5c84 MH |
1524 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1525 | { | |
8781915a | 1526 | event_remove(call); |
bd1a5c84 MH |
1527 | trace_destroy_fields(call); |
1528 | destroy_preds(call); | |
bd1a5c84 MH |
1529 | } |
1530 | ||
1531 | /* Remove an event_call */ | |
1532 | void trace_remove_event_call(struct ftrace_event_call *call) | |
1533 | { | |
1534 | mutex_lock(&event_mutex); | |
4fead8e4 | 1535 | down_write(&trace_event_mutex); |
bd1a5c84 | 1536 | __trace_remove_event_call(call); |
4fead8e4 | 1537 | up_write(&trace_event_mutex); |
bd1a5c84 MH |
1538 | mutex_unlock(&event_mutex); |
1539 | } | |
1540 | ||
1541 | #define for_each_event(event, start, end) \ | |
1542 | for (event = start; \ | |
1543 | (unsigned long)event < (unsigned long)end; \ | |
1544 | event++) | |
1545 | ||
1546 | #ifdef CONFIG_MODULES | |
1547 | ||
1548 | static LIST_HEAD(ftrace_module_file_list); | |
1549 | ||
1550 | /* | |
1551 | * Modules must own their file_operations to keep up with | |
1552 | * reference counting. | |
1553 | */ | |
1554 | struct ftrace_module_file_ops { | |
1555 | struct list_head list; | |
1556 | struct module *mod; | |
1557 | struct file_operations id; | |
1558 | struct file_operations enable; | |
1559 | struct file_operations format; | |
1560 | struct file_operations filter; | |
1561 | }; | |
1562 | ||
ae63b31e SR |
1563 | static struct ftrace_module_file_ops *find_ftrace_file_ops(struct module *mod) |
1564 | { | |
1565 | struct ftrace_module_file_ops *file_ops; | |
1566 | ||
1567 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1568 | if (file_ops->mod == mod) | |
1569 | return file_ops; | |
1570 | } | |
1571 | return NULL; | |
1572 | } | |
1573 | ||
701970b3 SR |
1574 | static struct ftrace_module_file_ops * |
1575 | trace_create_file_ops(struct module *mod) | |
1576 | { | |
1577 | struct ftrace_module_file_ops *file_ops; | |
1578 | ||
1579 | /* | |
1580 | * This is a bit of a PITA. To allow for correct reference | |
1581 | * counting, modules must "own" their file_operations. | |
1582 | * To do this, we allocate the file operations that will be | |
1583 | * used in the event directory. | |
1584 | */ | |
1585 | ||
1586 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1587 | if (!file_ops) | |
1588 | return NULL; | |
1589 | ||
1590 | file_ops->mod = mod; | |
1591 | ||
1592 | file_ops->id = ftrace_event_id_fops; | |
1593 | file_ops->id.owner = mod; | |
1594 | ||
1595 | file_ops->enable = ftrace_enable_fops; | |
1596 | file_ops->enable.owner = mod; | |
1597 | ||
1598 | file_ops->filter = ftrace_event_filter_fops; | |
1599 | file_ops->filter.owner = mod; | |
1600 | ||
1601 | file_ops->format = ftrace_event_format_fops; | |
1602 | file_ops->format.owner = mod; | |
1603 | ||
1604 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1605 | ||
1606 | return file_ops; | |
1607 | } | |
1608 | ||
6d723736 SR |
1609 | static void trace_module_add_events(struct module *mod) |
1610 | { | |
701970b3 | 1611 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1612 | struct ftrace_event_call **call, **start, **end; |
6d723736 SR |
1613 | |
1614 | start = mod->trace_events; | |
1615 | end = mod->trace_events + mod->num_trace_events; | |
1616 | ||
1617 | if (start == end) | |
1618 | return; | |
1619 | ||
67ead0a6 LZ |
1620 | file_ops = trace_create_file_ops(mod); |
1621 | if (!file_ops) | |
6d723736 SR |
1622 | return; |
1623 | ||
1624 | for_each_event(call, start, end) { | |
ae63b31e SR |
1625 | __register_event(*call, mod); |
1626 | __add_event_to_tracers(*call, file_ops); | |
6d723736 SR |
1627 | } |
1628 | } | |
1629 | ||
1630 | static void trace_module_remove_events(struct module *mod) | |
1631 | { | |
701970b3 | 1632 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1633 | struct ftrace_event_call *call, *p; |
9456f0fa | 1634 | bool found = false; |
6d723736 | 1635 | |
110bf2b7 | 1636 | down_write(&trace_event_mutex); |
6d723736 SR |
1637 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1638 | if (call->mod == mod) { | |
9456f0fa | 1639 | found = true; |
bd1a5c84 | 1640 | __trace_remove_event_call(call); |
6d723736 SR |
1641 | } |
1642 | } | |
701970b3 SR |
1643 | |
1644 | /* Now free the file_operations */ | |
1645 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1646 | if (file_ops->mod == mod) | |
1647 | break; | |
1648 | } | |
1649 | if (&file_ops->list != &ftrace_module_file_list) { | |
1650 | list_del(&file_ops->list); | |
1651 | kfree(file_ops); | |
1652 | } | |
9456f0fa SR |
1653 | |
1654 | /* | |
1655 | * It is safest to reset the ring buffer if the module being unloaded | |
1656 | * registered any events. | |
1657 | */ | |
1658 | if (found) | |
1659 | tracing_reset_current_online_cpus(); | |
110bf2b7 | 1660 | up_write(&trace_event_mutex); |
6d723736 SR |
1661 | } |
1662 | ||
61f919a1 SR |
1663 | static int trace_module_notify(struct notifier_block *self, |
1664 | unsigned long val, void *data) | |
6d723736 SR |
1665 | { |
1666 | struct module *mod = data; | |
1667 | ||
1668 | mutex_lock(&event_mutex); | |
1669 | switch (val) { | |
1670 | case MODULE_STATE_COMING: | |
1671 | trace_module_add_events(mod); | |
1672 | break; | |
1673 | case MODULE_STATE_GOING: | |
1674 | trace_module_remove_events(mod); | |
1675 | break; | |
1676 | } | |
1677 | mutex_unlock(&event_mutex); | |
fd994989 | 1678 | |
1473e441 SR |
1679 | return 0; |
1680 | } | |
61f919a1 | 1681 | #else |
ae63b31e SR |
1682 | static struct ftrace_module_file_ops *find_ftrace_file_ops(struct module *mod) |
1683 | { | |
1684 | return NULL; | |
1685 | } | |
61f919a1 SR |
1686 | static int trace_module_notify(struct notifier_block *self, |
1687 | unsigned long val, void *data) | |
1688 | { | |
1689 | return 0; | |
1690 | } | |
1691 | #endif /* CONFIG_MODULES */ | |
1473e441 | 1692 | |
ae63b31e SR |
1693 | /* Create a new event directory structure for a trace directory. */ |
1694 | static void | |
1695 | __trace_add_event_dirs(struct trace_array *tr) | |
1696 | { | |
1697 | struct ftrace_module_file_ops *file_ops = NULL; | |
1698 | struct ftrace_event_call *call; | |
1699 | int ret; | |
1700 | ||
1701 | list_for_each_entry(call, &ftrace_events, list) { | |
1702 | if (call->mod) { | |
1703 | /* | |
1704 | * Directories for events by modules need to | |
1705 | * keep module ref counts when opened (as we don't | |
1706 | * want the module to disappear when reading one | |
1707 | * of these files). The file_ops keep account of | |
1708 | * the module ref count. | |
1709 | * | |
1710 | * As event_calls are added in groups by module, | |
1711 | * when we find one file_ops, we don't need to search for | |
1712 | * each call in that module, as the rest should be the | |
1713 | * same. Only search for a new one if the last one did | |
1714 | * not match. | |
1715 | */ | |
1716 | if (!file_ops || call->mod != file_ops->mod) | |
1717 | file_ops = find_ftrace_file_ops(call->mod); | |
1718 | if (!file_ops) | |
1719 | continue; /* Warn? */ | |
1720 | ret = __trace_add_new_event(call, tr, | |
1721 | &file_ops->id, &file_ops->enable, | |
1722 | &file_ops->filter, &file_ops->format); | |
1723 | if (ret < 0) | |
1724 | pr_warning("Could not create directory for event %s\n", | |
1725 | call->name); | |
1726 | continue; | |
1727 | } | |
1728 | ret = __trace_add_new_event(call, tr, | |
1729 | &ftrace_event_id_fops, | |
1730 | &ftrace_enable_fops, | |
1731 | &ftrace_event_filter_fops, | |
1732 | &ftrace_event_format_fops); | |
1733 | if (ret < 0) | |
1734 | pr_warning("Could not create directory for event %s\n", | |
1735 | call->name); | |
1736 | } | |
1737 | } | |
1738 | ||
77248221 SR |
1739 | /* |
1740 | * The top level array has already had its ftrace_event_file | |
1741 | * descriptors created in order to allow for early events to | |
1742 | * be recorded. This function is called after the debugfs has been | |
1743 | * initialized, and we now have to create the files associated | |
1744 | * to the events. | |
1745 | */ | |
1746 | static __init void | |
1747 | __trace_early_add_event_dirs(struct trace_array *tr) | |
1748 | { | |
1749 | struct ftrace_event_file *file; | |
1750 | int ret; | |
1751 | ||
1752 | ||
1753 | list_for_each_entry(file, &tr->events, list) { | |
1754 | ret = event_create_dir(tr->event_dir, file, | |
1755 | &ftrace_event_id_fops, | |
1756 | &ftrace_enable_fops, | |
1757 | &ftrace_event_filter_fops, | |
1758 | &ftrace_event_format_fops); | |
1759 | if (ret < 0) | |
1760 | pr_warning("Could not create directory for event %s\n", | |
1761 | file->event_call->name); | |
1762 | } | |
1763 | } | |
1764 | ||
1765 | /* | |
1766 | * For early boot up, the top trace array requires to have | |
1767 | * a list of events that can be enabled. This must be done before | |
1768 | * the filesystem is set up in order to allow events to be traced | |
1769 | * early. | |
1770 | */ | |
1771 | static __init void | |
1772 | __trace_early_add_events(struct trace_array *tr) | |
1773 | { | |
1774 | struct ftrace_event_call *call; | |
1775 | int ret; | |
1776 | ||
1777 | list_for_each_entry(call, &ftrace_events, list) { | |
1778 | /* Early boot up should not have any modules loaded */ | |
1779 | if (WARN_ON_ONCE(call->mod)) | |
1780 | continue; | |
1781 | ||
1782 | ret = __trace_early_add_new_event(call, tr); | |
1783 | if (ret < 0) | |
1784 | pr_warning("Could not create early event %s\n", | |
1785 | call->name); | |
1786 | } | |
1787 | } | |
1788 | ||
0c8916c3 SR |
1789 | /* Remove the event directory structure for a trace directory. */ |
1790 | static void | |
1791 | __trace_remove_event_dirs(struct trace_array *tr) | |
1792 | { | |
1793 | struct ftrace_event_file *file, *next; | |
1794 | ||
1795 | list_for_each_entry_safe(file, next, &tr->events, list) { | |
1796 | list_del(&file->list); | |
1797 | debugfs_remove_recursive(file->dir); | |
1798 | remove_subsystem(file->system); | |
d1a29143 | 1799 | kmem_cache_free(file_cachep, file); |
0c8916c3 SR |
1800 | } |
1801 | } | |
1802 | ||
ae63b31e SR |
1803 | static void |
1804 | __add_event_to_tracers(struct ftrace_event_call *call, | |
1805 | struct ftrace_module_file_ops *file_ops) | |
1806 | { | |
1807 | struct trace_array *tr; | |
1808 | ||
1809 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
1810 | if (file_ops) | |
1811 | __trace_add_new_event(call, tr, | |
1812 | &file_ops->id, &file_ops->enable, | |
1813 | &file_ops->filter, &file_ops->format); | |
1814 | else | |
1815 | __trace_add_new_event(call, tr, | |
1816 | &ftrace_event_id_fops, | |
1817 | &ftrace_enable_fops, | |
1818 | &ftrace_event_filter_fops, | |
1819 | &ftrace_event_format_fops); | |
1820 | } | |
1821 | } | |
1822 | ||
ec827c7e | 1823 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
1824 | .notifier_call = trace_module_notify, |
1825 | .priority = 0, | |
1826 | }; | |
1827 | ||
e4a9ea5e SR |
1828 | extern struct ftrace_event_call *__start_ftrace_events[]; |
1829 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 1830 | |
020e5f85 LZ |
1831 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
1832 | ||
1833 | static __init int setup_trace_event(char *str) | |
1834 | { | |
1835 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
1836 | ring_buffer_expanded = 1; | |
1837 | tracing_selftest_disabled = 1; | |
1838 | ||
1839 | return 1; | |
1840 | } | |
1841 | __setup("trace_event=", setup_trace_event); | |
1842 | ||
77248221 SR |
1843 | /* Expects to have event_mutex held when called */ |
1844 | static int | |
1845 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
1846 | { |
1847 | struct dentry *d_events; | |
1848 | struct dentry *entry; | |
1849 | ||
1850 | entry = debugfs_create_file("set_event", 0644, parent, | |
1851 | tr, &ftrace_set_event_fops); | |
1852 | if (!entry) { | |
1853 | pr_warning("Could not create debugfs 'set_event' entry\n"); | |
1854 | return -ENOMEM; | |
1855 | } | |
1856 | ||
1857 | d_events = debugfs_create_dir("events", parent); | |
277ba044 | 1858 | if (!d_events) { |
ae63b31e | 1859 | pr_warning("Could not create debugfs 'events' directory\n"); |
277ba044 SR |
1860 | return -ENOMEM; |
1861 | } | |
ae63b31e SR |
1862 | |
1863 | /* ring buffer internal formats */ | |
1864 | trace_create_file("header_page", 0444, d_events, | |
1865 | ring_buffer_print_page_header, | |
1866 | &ftrace_show_header_fops); | |
1867 | ||
1868 | trace_create_file("header_event", 0444, d_events, | |
1869 | ring_buffer_print_entry_header, | |
1870 | &ftrace_show_header_fops); | |
1871 | ||
1872 | trace_create_file("enable", 0644, d_events, | |
1873 | tr, &ftrace_tr_enable_fops); | |
1874 | ||
1875 | tr->event_dir = d_events; | |
77248221 SR |
1876 | |
1877 | return 0; | |
1878 | } | |
1879 | ||
1880 | /** | |
1881 | * event_trace_add_tracer - add a instance of a trace_array to events | |
1882 | * @parent: The parent dentry to place the files/directories for events in | |
1883 | * @tr: The trace array associated with these events | |
1884 | * | |
1885 | * When a new instance is created, it needs to set up its events | |
1886 | * directory, as well as other files associated with events. It also | |
1887 | * creates the event hierachry in the @parent/events directory. | |
1888 | * | |
1889 | * Returns 0 on success. | |
1890 | */ | |
1891 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
1892 | { | |
1893 | int ret; | |
1894 | ||
1895 | mutex_lock(&event_mutex); | |
1896 | ||
1897 | ret = create_event_toplevel_files(parent, tr); | |
1898 | if (ret) | |
1899 | goto out_unlock; | |
1900 | ||
277ba044 | 1901 | down_write(&trace_event_mutex); |
ae63b31e | 1902 | __trace_add_event_dirs(tr); |
277ba044 SR |
1903 | up_write(&trace_event_mutex); |
1904 | ||
77248221 | 1905 | out_unlock: |
277ba044 | 1906 | mutex_unlock(&event_mutex); |
ae63b31e | 1907 | |
77248221 SR |
1908 | return ret; |
1909 | } | |
1910 | ||
1911 | /* | |
1912 | * The top trace array already had its file descriptors created. | |
1913 | * Now the files themselves need to be created. | |
1914 | */ | |
1915 | static __init int | |
1916 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
1917 | { | |
1918 | int ret; | |
1919 | ||
1920 | mutex_lock(&event_mutex); | |
1921 | ||
1922 | ret = create_event_toplevel_files(parent, tr); | |
1923 | if (ret) | |
1924 | goto out_unlock; | |
1925 | ||
1926 | down_write(&trace_event_mutex); | |
1927 | __trace_early_add_event_dirs(tr); | |
1928 | up_write(&trace_event_mutex); | |
1929 | ||
1930 | out_unlock: | |
1931 | mutex_unlock(&event_mutex); | |
1932 | ||
1933 | return ret; | |
ae63b31e SR |
1934 | } |
1935 | ||
0c8916c3 SR |
1936 | int event_trace_del_tracer(struct trace_array *tr) |
1937 | { | |
1938 | /* Disable any running events */ | |
1939 | __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); | |
1940 | ||
1941 | mutex_lock(&event_mutex); | |
1942 | ||
1943 | down_write(&trace_event_mutex); | |
1944 | __trace_remove_event_dirs(tr); | |
1945 | debugfs_remove_recursive(tr->event_dir); | |
1946 | up_write(&trace_event_mutex); | |
1947 | ||
1948 | tr->event_dir = NULL; | |
1949 | ||
1950 | mutex_unlock(&event_mutex); | |
1951 | ||
1952 | return 0; | |
1953 | } | |
1954 | ||
d1a29143 SR |
1955 | static __init int event_trace_memsetup(void) |
1956 | { | |
1957 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
1958 | file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC); | |
1959 | return 0; | |
1960 | } | |
1961 | ||
8781915a EG |
1962 | static __init int event_trace_enable(void) |
1963 | { | |
ae63b31e | 1964 | struct trace_array *tr = top_trace_array(); |
8781915a EG |
1965 | struct ftrace_event_call **iter, *call; |
1966 | char *buf = bootup_event_buf; | |
1967 | char *token; | |
1968 | int ret; | |
1969 | ||
1970 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { | |
1971 | ||
1972 | call = *iter; | |
1973 | ret = event_init(call); | |
1974 | if (!ret) | |
1975 | list_add(&call->list, &ftrace_events); | |
1976 | } | |
1977 | ||
77248221 SR |
1978 | /* |
1979 | * We need the top trace array to have a working set of trace | |
1980 | * points at early init, before the debug files and directories | |
1981 | * are created. Create the file entries now, and attach them | |
1982 | * to the actual file dentries later. | |
1983 | */ | |
1984 | __trace_early_add_events(tr); | |
1985 | ||
8781915a EG |
1986 | while (true) { |
1987 | token = strsep(&buf, ","); | |
1988 | ||
1989 | if (!token) | |
1990 | break; | |
1991 | if (!*token) | |
1992 | continue; | |
1993 | ||
ae63b31e | 1994 | ret = ftrace_set_clr_event(tr, token, 1); |
8781915a EG |
1995 | if (ret) |
1996 | pr_warn("Failed to enable trace event: %s\n", token); | |
1997 | } | |
81698831 SR |
1998 | |
1999 | trace_printk_start_comm(); | |
2000 | ||
8781915a EG |
2001 | return 0; |
2002 | } | |
2003 | ||
b77e38aa SR |
2004 | static __init int event_trace_init(void) |
2005 | { | |
ae63b31e | 2006 | struct trace_array *tr; |
b77e38aa SR |
2007 | struct dentry *d_tracer; |
2008 | struct dentry *entry; | |
6d723736 | 2009 | int ret; |
b77e38aa | 2010 | |
ae63b31e SR |
2011 | tr = top_trace_array(); |
2012 | ||
b77e38aa SR |
2013 | d_tracer = tracing_init_dentry(); |
2014 | if (!d_tracer) | |
2015 | return 0; | |
2016 | ||
2314c4ae | 2017 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 2018 | tr, &ftrace_avail_fops); |
2314c4ae SR |
2019 | if (!entry) |
2020 | pr_warning("Could not create debugfs " | |
2021 | "'available_events' entry\n"); | |
2022 | ||
8728fe50 LZ |
2023 | if (trace_define_common_fields()) |
2024 | pr_warning("tracing: Failed to allocate common fields"); | |
2025 | ||
77248221 | 2026 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
2027 | if (ret) |
2028 | return ret; | |
020e5f85 | 2029 | |
6d723736 | 2030 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 2031 | if (ret) |
6d723736 SR |
2032 | pr_warning("Failed to register trace events module notifier\n"); |
2033 | ||
b77e38aa SR |
2034 | return 0; |
2035 | } | |
d1a29143 | 2036 | early_initcall(event_trace_memsetup); |
8781915a | 2037 | core_initcall(event_trace_enable); |
b77e38aa | 2038 | fs_initcall(event_trace_init); |
e6187007 SR |
2039 | |
2040 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
2041 | ||
2042 | static DEFINE_SPINLOCK(test_spinlock); | |
2043 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
2044 | static DEFINE_MUTEX(test_mutex); | |
2045 | ||
2046 | static __init void test_work(struct work_struct *dummy) | |
2047 | { | |
2048 | spin_lock(&test_spinlock); | |
2049 | spin_lock_irq(&test_spinlock_irq); | |
2050 | udelay(1); | |
2051 | spin_unlock_irq(&test_spinlock_irq); | |
2052 | spin_unlock(&test_spinlock); | |
2053 | ||
2054 | mutex_lock(&test_mutex); | |
2055 | msleep(1); | |
2056 | mutex_unlock(&test_mutex); | |
2057 | } | |
2058 | ||
2059 | static __init int event_test_thread(void *unused) | |
2060 | { | |
2061 | void *test_malloc; | |
2062 | ||
2063 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
2064 | if (!test_malloc) | |
2065 | pr_info("failed to kmalloc\n"); | |
2066 | ||
2067 | schedule_on_each_cpu(test_work); | |
2068 | ||
2069 | kfree(test_malloc); | |
2070 | ||
2071 | set_current_state(TASK_INTERRUPTIBLE); | |
2072 | while (!kthread_should_stop()) | |
2073 | schedule(); | |
2074 | ||
2075 | return 0; | |
2076 | } | |
2077 | ||
2078 | /* | |
2079 | * Do various things that may trigger events. | |
2080 | */ | |
2081 | static __init void event_test_stuff(void) | |
2082 | { | |
2083 | struct task_struct *test_thread; | |
2084 | ||
2085 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
2086 | msleep(1); | |
2087 | kthread_stop(test_thread); | |
2088 | } | |
2089 | ||
2090 | /* | |
2091 | * For every trace event defined, we will test each trace point separately, | |
2092 | * and then by groups, and finally all trace points. | |
2093 | */ | |
9ea21c1e | 2094 | static __init void event_trace_self_tests(void) |
e6187007 | 2095 | { |
ae63b31e SR |
2096 | struct ftrace_subsystem_dir *dir; |
2097 | struct ftrace_event_file *file; | |
e6187007 SR |
2098 | struct ftrace_event_call *call; |
2099 | struct event_subsystem *system; | |
ae63b31e | 2100 | struct trace_array *tr; |
e6187007 SR |
2101 | int ret; |
2102 | ||
ae63b31e SR |
2103 | tr = top_trace_array(); |
2104 | ||
e6187007 SR |
2105 | pr_info("Running tests on trace events:\n"); |
2106 | ||
ae63b31e SR |
2107 | list_for_each_entry(file, &tr->events, list) { |
2108 | ||
2109 | call = file->event_call; | |
e6187007 | 2110 | |
2239291a SR |
2111 | /* Only test those that have a probe */ |
2112 | if (!call->class || !call->class->probe) | |
e6187007 SR |
2113 | continue; |
2114 | ||
1f5a6b45 SR |
2115 | /* |
2116 | * Testing syscall events here is pretty useless, but | |
2117 | * we still do it if configured. But this is time consuming. | |
2118 | * What we really need is a user thread to perform the | |
2119 | * syscalls as we test. | |
2120 | */ | |
2121 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
2122 | if (call->class->system && |
2123 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
2124 | continue; |
2125 | #endif | |
2126 | ||
e6187007 SR |
2127 | pr_info("Testing event %s: ", call->name); |
2128 | ||
2129 | /* | |
2130 | * If an event is already enabled, someone is using | |
2131 | * it and the self test should not be on. | |
2132 | */ | |
ae63b31e | 2133 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
2134 | pr_warning("Enabled event during self test!\n"); |
2135 | WARN_ON_ONCE(1); | |
2136 | continue; | |
2137 | } | |
2138 | ||
ae63b31e | 2139 | ftrace_event_enable_disable(file, 1); |
e6187007 | 2140 | event_test_stuff(); |
ae63b31e | 2141 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
2142 | |
2143 | pr_cont("OK\n"); | |
2144 | } | |
2145 | ||
2146 | /* Now test at the sub system level */ | |
2147 | ||
2148 | pr_info("Running tests on trace event systems:\n"); | |
2149 | ||
ae63b31e SR |
2150 | list_for_each_entry(dir, &tr->systems, list) { |
2151 | ||
2152 | system = dir->subsystem; | |
e6187007 SR |
2153 | |
2154 | /* the ftrace system is special, skip it */ | |
2155 | if (strcmp(system->name, "ftrace") == 0) | |
2156 | continue; | |
2157 | ||
2158 | pr_info("Testing event system %s: ", system->name); | |
2159 | ||
ae63b31e | 2160 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 SR |
2161 | if (WARN_ON_ONCE(ret)) { |
2162 | pr_warning("error enabling system %s\n", | |
2163 | system->name); | |
2164 | continue; | |
2165 | } | |
2166 | ||
2167 | event_test_stuff(); | |
2168 | ||
ae63b31e | 2169 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 2170 | if (WARN_ON_ONCE(ret)) { |
e6187007 SR |
2171 | pr_warning("error disabling system %s\n", |
2172 | system->name); | |
76bab1b7 YL |
2173 | continue; |
2174 | } | |
e6187007 SR |
2175 | |
2176 | pr_cont("OK\n"); | |
2177 | } | |
2178 | ||
2179 | /* Test with all events enabled */ | |
2180 | ||
2181 | pr_info("Running tests on all trace events:\n"); | |
2182 | pr_info("Testing all events: "); | |
2183 | ||
ae63b31e | 2184 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 2185 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 2186 | pr_warning("error enabling all events\n"); |
9ea21c1e | 2187 | return; |
e6187007 SR |
2188 | } |
2189 | ||
2190 | event_test_stuff(); | |
2191 | ||
2192 | /* reset sysname */ | |
ae63b31e | 2193 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 SR |
2194 | if (WARN_ON_ONCE(ret)) { |
2195 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 2196 | return; |
e6187007 SR |
2197 | } |
2198 | ||
2199 | pr_cont("OK\n"); | |
9ea21c1e SR |
2200 | } |
2201 | ||
2202 | #ifdef CONFIG_FUNCTION_TRACER | |
2203 | ||
245b2e70 | 2204 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
2205 | |
2206 | static void | |
2f5f6ad9 | 2207 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 2208 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
2209 | { |
2210 | struct ring_buffer_event *event; | |
e77405ad | 2211 | struct ring_buffer *buffer; |
9ea21c1e SR |
2212 | struct ftrace_entry *entry; |
2213 | unsigned long flags; | |
2214 | long disabled; | |
9ea21c1e SR |
2215 | int cpu; |
2216 | int pc; | |
2217 | ||
2218 | pc = preempt_count(); | |
5168ae50 | 2219 | preempt_disable_notrace(); |
9ea21c1e | 2220 | cpu = raw_smp_processor_id(); |
245b2e70 | 2221 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
2222 | |
2223 | if (disabled != 1) | |
2224 | goto out; | |
2225 | ||
2226 | local_save_flags(flags); | |
2227 | ||
e77405ad SR |
2228 | event = trace_current_buffer_lock_reserve(&buffer, |
2229 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
2230 | flags, pc); |
2231 | if (!event) | |
2232 | goto out; | |
2233 | entry = ring_buffer_event_data(event); | |
2234 | entry->ip = ip; | |
2235 | entry->parent_ip = parent_ip; | |
2236 | ||
0d5c6e1c | 2237 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
2238 | |
2239 | out: | |
245b2e70 | 2240 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 2241 | preempt_enable_notrace(); |
9ea21c1e SR |
2242 | } |
2243 | ||
2244 | static struct ftrace_ops trace_ops __initdata = | |
2245 | { | |
2246 | .func = function_test_events_call, | |
4740974a | 2247 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
2248 | }; |
2249 | ||
2250 | static __init void event_trace_self_test_with_function(void) | |
2251 | { | |
17bb615a SR |
2252 | int ret; |
2253 | ret = register_ftrace_function(&trace_ops); | |
2254 | if (WARN_ON(ret < 0)) { | |
2255 | pr_info("Failed to enable function tracer for event tests\n"); | |
2256 | return; | |
2257 | } | |
9ea21c1e SR |
2258 | pr_info("Running tests again, along with the function tracer\n"); |
2259 | event_trace_self_tests(); | |
2260 | unregister_ftrace_function(&trace_ops); | |
2261 | } | |
2262 | #else | |
2263 | static __init void event_trace_self_test_with_function(void) | |
2264 | { | |
2265 | } | |
2266 | #endif | |
2267 | ||
2268 | static __init int event_trace_self_tests_init(void) | |
2269 | { | |
020e5f85 LZ |
2270 | if (!tracing_selftest_disabled) { |
2271 | event_trace_self_tests(); | |
2272 | event_trace_self_test_with_function(); | |
2273 | } | |
e6187007 SR |
2274 | |
2275 | return 0; | |
2276 | } | |
2277 | ||
28d20e2d | 2278 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
2279 | |
2280 | #endif |