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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 | ||
3448bac3 FF |
11 | #define pr_fmt(fmt) fmt |
12 | ||
e6187007 SR |
13 | #include <linux/workqueue.h> |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/kthread.h> | |
b77e38aa SR |
16 | #include <linux/debugfs.h> |
17 | #include <linux/uaccess.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/ctype.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
e6187007 | 21 | #include <linux/delay.h> |
b77e38aa | 22 | |
020e5f85 LZ |
23 | #include <asm/setup.h> |
24 | ||
91729ef9 | 25 | #include "trace_output.h" |
b77e38aa | 26 | |
4e5292ea | 27 | #undef TRACE_SYSTEM |
b628b3e6 SR |
28 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
29 | ||
20c8928a | 30 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 31 | |
a59fd602 | 32 | LIST_HEAD(ftrace_events); |
b3a8c6fd | 33 | static LIST_HEAD(ftrace_common_fields); |
a59fd602 | 34 | |
d1a29143 SR |
35 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
36 | ||
37 | static struct kmem_cache *field_cachep; | |
38 | static struct kmem_cache *file_cachep; | |
39 | ||
6e94a780 SR |
40 | #define SYSTEM_FL_FREE_NAME (1 << 31) |
41 | ||
42 | static inline int system_refcount(struct event_subsystem *system) | |
43 | { | |
44 | return system->ref_count & ~SYSTEM_FL_FREE_NAME; | |
45 | } | |
46 | ||
47 | static int system_refcount_inc(struct event_subsystem *system) | |
48 | { | |
49 | return (system->ref_count++) & ~SYSTEM_FL_FREE_NAME; | |
50 | } | |
51 | ||
52 | static int system_refcount_dec(struct event_subsystem *system) | |
53 | { | |
54 | return (--system->ref_count) & ~SYSTEM_FL_FREE_NAME; | |
55 | } | |
56 | ||
ae63b31e SR |
57 | /* Double loops, do not use break, only goto's work */ |
58 | #define do_for_each_event_file(tr, file) \ | |
59 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
60 | list_for_each_entry(file, &tr->events, list) | |
61 | ||
62 | #define do_for_each_event_file_safe(tr, file) \ | |
63 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
64 | struct ftrace_event_file *___n; \ | |
65 | list_for_each_entry_safe(file, ___n, &tr->events, list) | |
66 | ||
67 | #define while_for_each_event_file() \ | |
68 | } | |
69 | ||
b3a8c6fd | 70 | static struct list_head * |
2e33af02 SR |
71 | trace_get_fields(struct ftrace_event_call *event_call) |
72 | { | |
73 | if (!event_call->class->get_fields) | |
74 | return &event_call->class->fields; | |
75 | return event_call->class->get_fields(event_call); | |
76 | } | |
77 | ||
b3a8c6fd J |
78 | static struct ftrace_event_field * |
79 | __find_event_field(struct list_head *head, char *name) | |
80 | { | |
81 | struct ftrace_event_field *field; | |
82 | ||
83 | list_for_each_entry(field, head, link) { | |
84 | if (!strcmp(field->name, name)) | |
85 | return field; | |
86 | } | |
87 | ||
88 | return NULL; | |
89 | } | |
90 | ||
91 | struct ftrace_event_field * | |
92 | trace_find_event_field(struct ftrace_event_call *call, char *name) | |
93 | { | |
94 | struct ftrace_event_field *field; | |
95 | struct list_head *head; | |
96 | ||
97 | field = __find_event_field(&ftrace_common_fields, name); | |
98 | if (field) | |
99 | return field; | |
100 | ||
101 | head = trace_get_fields(call); | |
102 | return __find_event_field(head, name); | |
103 | } | |
104 | ||
8728fe50 LZ |
105 | static int __trace_define_field(struct list_head *head, const char *type, |
106 | const char *name, int offset, int size, | |
107 | int is_signed, int filter_type) | |
cf027f64 TZ |
108 | { |
109 | struct ftrace_event_field *field; | |
110 | ||
d1a29143 | 111 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 112 | if (!field) |
aaf6ac0f | 113 | return -ENOMEM; |
fe9f57f2 | 114 | |
92edca07 SR |
115 | field->name = name; |
116 | field->type = type; | |
fe9f57f2 | 117 | |
43b51ead LZ |
118 | if (filter_type == FILTER_OTHER) |
119 | field->filter_type = filter_assign_type(type); | |
120 | else | |
121 | field->filter_type = filter_type; | |
122 | ||
cf027f64 TZ |
123 | field->offset = offset; |
124 | field->size = size; | |
a118e4d1 | 125 | field->is_signed = is_signed; |
aa38e9fc | 126 | |
2e33af02 | 127 | list_add(&field->link, head); |
cf027f64 TZ |
128 | |
129 | return 0; | |
cf027f64 | 130 | } |
8728fe50 LZ |
131 | |
132 | int trace_define_field(struct ftrace_event_call *call, const char *type, | |
133 | const char *name, int offset, int size, int is_signed, | |
134 | int filter_type) | |
135 | { | |
136 | struct list_head *head; | |
137 | ||
138 | if (WARN_ON(!call->class)) | |
139 | return 0; | |
140 | ||
141 | head = trace_get_fields(call); | |
142 | return __trace_define_field(head, type, name, offset, size, | |
143 | is_signed, filter_type); | |
144 | } | |
17c873ec | 145 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 146 | |
e647d6b3 | 147 | #define __common_field(type, item) \ |
8728fe50 LZ |
148 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
149 | "common_" #item, \ | |
150 | offsetof(typeof(ent), item), \ | |
151 | sizeof(ent.item), \ | |
152 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
153 | if (ret) \ |
154 | return ret; | |
155 | ||
8728fe50 | 156 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
157 | { |
158 | int ret; | |
159 | struct trace_entry ent; | |
160 | ||
161 | __common_field(unsigned short, type); | |
162 | __common_field(unsigned char, flags); | |
163 | __common_field(unsigned char, preempt_count); | |
164 | __common_field(int, pid); | |
e647d6b3 LZ |
165 | |
166 | return ret; | |
167 | } | |
168 | ||
ad7067ce | 169 | static void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
170 | { |
171 | struct ftrace_event_field *field, *next; | |
2e33af02 | 172 | struct list_head *head; |
2df75e41 | 173 | |
2e33af02 SR |
174 | head = trace_get_fields(call); |
175 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 176 | list_del(&field->link); |
d1a29143 | 177 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
178 | } |
179 | } | |
180 | ||
87d9b4e1 LZ |
181 | int trace_event_raw_init(struct ftrace_event_call *call) |
182 | { | |
183 | int id; | |
184 | ||
80decc70 | 185 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
186 | if (!id) |
187 | return -ENODEV; | |
87d9b4e1 LZ |
188 | |
189 | return 0; | |
190 | } | |
191 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
192 | ||
3fd40d1e SR |
193 | void *ftrace_event_buffer_reserve(struct ftrace_event_buffer *fbuffer, |
194 | struct ftrace_event_file *ftrace_file, | |
195 | unsigned long len) | |
196 | { | |
197 | struct ftrace_event_call *event_call = ftrace_file->event_call; | |
198 | ||
199 | local_save_flags(fbuffer->flags); | |
200 | fbuffer->pc = preempt_count(); | |
201 | fbuffer->ftrace_file = ftrace_file; | |
202 | ||
203 | fbuffer->event = | |
204 | trace_event_buffer_lock_reserve(&fbuffer->buffer, ftrace_file, | |
205 | event_call->event.type, len, | |
206 | fbuffer->flags, fbuffer->pc); | |
207 | if (!fbuffer->event) | |
208 | return NULL; | |
209 | ||
210 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); | |
211 | return fbuffer->entry; | |
212 | } | |
213 | EXPORT_SYMBOL_GPL(ftrace_event_buffer_reserve); | |
214 | ||
215 | void ftrace_event_buffer_commit(struct ftrace_event_buffer *fbuffer) | |
216 | { | |
217 | event_trigger_unlock_commit(fbuffer->ftrace_file, fbuffer->buffer, | |
218 | fbuffer->event, fbuffer->entry, | |
219 | fbuffer->flags, fbuffer->pc); | |
220 | } | |
221 | EXPORT_SYMBOL_GPL(ftrace_event_buffer_commit); | |
222 | ||
ceec0b6f JO |
223 | int ftrace_event_reg(struct ftrace_event_call *call, |
224 | enum trace_reg type, void *data) | |
a1d0ce82 | 225 | { |
ae63b31e SR |
226 | struct ftrace_event_file *file = data; |
227 | ||
de7b2973 | 228 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
a1d0ce82 SR |
229 | switch (type) { |
230 | case TRACE_REG_REGISTER: | |
de7b2973 | 231 | return tracepoint_probe_register(call->tp, |
a1d0ce82 | 232 | call->class->probe, |
ae63b31e | 233 | file); |
a1d0ce82 | 234 | case TRACE_REG_UNREGISTER: |
de7b2973 | 235 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 | 236 | call->class->probe, |
ae63b31e | 237 | file); |
a1d0ce82 SR |
238 | return 0; |
239 | ||
240 | #ifdef CONFIG_PERF_EVENTS | |
241 | case TRACE_REG_PERF_REGISTER: | |
de7b2973 | 242 | return tracepoint_probe_register(call->tp, |
a1d0ce82 SR |
243 | call->class->perf_probe, |
244 | call); | |
245 | case TRACE_REG_PERF_UNREGISTER: | |
de7b2973 | 246 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 SR |
247 | call->class->perf_probe, |
248 | call); | |
249 | return 0; | |
ceec0b6f JO |
250 | case TRACE_REG_PERF_OPEN: |
251 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
252 | case TRACE_REG_PERF_ADD: |
253 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 254 | return 0; |
a1d0ce82 SR |
255 | #endif |
256 | } | |
257 | return 0; | |
258 | } | |
259 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
260 | ||
e870e9a1 LZ |
261 | void trace_event_enable_cmd_record(bool enable) |
262 | { | |
ae63b31e SR |
263 | struct ftrace_event_file *file; |
264 | struct trace_array *tr; | |
e870e9a1 LZ |
265 | |
266 | mutex_lock(&event_mutex); | |
ae63b31e SR |
267 | do_for_each_event_file(tr, file) { |
268 | ||
269 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) | |
e870e9a1 LZ |
270 | continue; |
271 | ||
272 | if (enable) { | |
273 | tracing_start_cmdline_record(); | |
417944c4 | 274 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
275 | } else { |
276 | tracing_stop_cmdline_record(); | |
417944c4 | 277 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 278 | } |
ae63b31e | 279 | } while_for_each_event_file(); |
e870e9a1 LZ |
280 | mutex_unlock(&event_mutex); |
281 | } | |
282 | ||
417944c4 SRRH |
283 | static int __ftrace_event_enable_disable(struct ftrace_event_file *file, |
284 | int enable, int soft_disable) | |
fd994989 | 285 | { |
ae63b31e | 286 | struct ftrace_event_call *call = file->event_call; |
3b8e4273 | 287 | int ret = 0; |
417944c4 | 288 | int disable; |
3b8e4273 | 289 | |
fd994989 SR |
290 | switch (enable) { |
291 | case 0: | |
417944c4 | 292 | /* |
1cf4c073 MH |
293 | * When soft_disable is set and enable is cleared, the sm_ref |
294 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
295 | * to clear the SOFT_DISABLED flag but leave the event in the |
296 | * state that it was. That is, if the event was enabled and | |
297 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
298 | * is set we do not want the event to be enabled before we | |
299 | * clear the bit. | |
300 | * | |
301 | * When soft_disable is not set but the SOFT_MODE flag is, | |
302 | * we do nothing. Do not disable the tracepoint, otherwise | |
303 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
304 | */ | |
305 | if (soft_disable) { | |
1cf4c073 MH |
306 | if (atomic_dec_return(&file->sm_ref) > 0) |
307 | break; | |
417944c4 SRRH |
308 | disable = file->flags & FTRACE_EVENT_FL_SOFT_DISABLED; |
309 | clear_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); | |
310 | } else | |
311 | disable = !(file->flags & FTRACE_EVENT_FL_SOFT_MODE); | |
312 | ||
313 | if (disable && (file->flags & FTRACE_EVENT_FL_ENABLED)) { | |
314 | clear_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); | |
ae63b31e | 315 | if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) { |
e870e9a1 | 316 | tracing_stop_cmdline_record(); |
417944c4 | 317 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 318 | } |
ae63b31e | 319 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 320 | } |
3baa5e4c | 321 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
417944c4 SRRH |
322 | if (file->flags & FTRACE_EVENT_FL_SOFT_MODE) |
323 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c TZ |
324 | else |
325 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
fd994989 SR |
326 | break; |
327 | case 1: | |
417944c4 SRRH |
328 | /* |
329 | * When soft_disable is set and enable is set, we want to | |
330 | * register the tracepoint for the event, but leave the event | |
331 | * as is. That means, if the event was already enabled, we do | |
332 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
333 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
334 | * it still seems to be disabled. | |
335 | */ | |
336 | if (!soft_disable) | |
337 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
1cf4c073 MH |
338 | else { |
339 | if (atomic_inc_return(&file->sm_ref) > 1) | |
340 | break; | |
417944c4 | 341 | set_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 342 | } |
417944c4 | 343 | |
ae63b31e | 344 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) { |
417944c4 SRRH |
345 | |
346 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
347 | if (soft_disable) | |
348 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
349 | ||
e870e9a1 LZ |
350 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
351 | tracing_start_cmdline_record(); | |
417944c4 | 352 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 353 | } |
ae63b31e | 354 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
355 | if (ret) { |
356 | tracing_stop_cmdline_record(); | |
357 | pr_info("event trace: Could not enable event " | |
de7b2973 | 358 | "%s\n", ftrace_event_name(call)); |
3b8e4273 LZ |
359 | break; |
360 | } | |
417944c4 | 361 | set_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
362 | |
363 | /* WAS_ENABLED gets set but never cleared. */ | |
364 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; | |
fd994989 | 365 | } |
fd994989 SR |
366 | break; |
367 | } | |
3b8e4273 LZ |
368 | |
369 | return ret; | |
fd994989 SR |
370 | } |
371 | ||
85f2b082 TZ |
372 | int trace_event_enable_disable(struct ftrace_event_file *file, |
373 | int enable, int soft_disable) | |
374 | { | |
375 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
376 | } | |
377 | ||
417944c4 SRRH |
378 | static int ftrace_event_enable_disable(struct ftrace_event_file *file, |
379 | int enable) | |
380 | { | |
381 | return __ftrace_event_enable_disable(file, enable, 0); | |
382 | } | |
383 | ||
ae63b31e | 384 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 385 | { |
ae63b31e | 386 | struct ftrace_event_file *file; |
0e907c99 Z |
387 | |
388 | mutex_lock(&event_mutex); | |
ae63b31e SR |
389 | list_for_each_entry(file, &tr->events, list) { |
390 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
391 | } |
392 | mutex_unlock(&event_mutex); | |
393 | } | |
394 | ||
e9dbfae5 SR |
395 | static void __put_system(struct event_subsystem *system) |
396 | { | |
397 | struct event_filter *filter = system->filter; | |
398 | ||
6e94a780 SR |
399 | WARN_ON_ONCE(system_refcount(system) == 0); |
400 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
401 | return; |
402 | ||
ae63b31e SR |
403 | list_del(&system->list); |
404 | ||
e9dbfae5 SR |
405 | if (filter) { |
406 | kfree(filter->filter_string); | |
407 | kfree(filter); | |
408 | } | |
6e94a780 SR |
409 | if (system->ref_count & SYSTEM_FL_FREE_NAME) |
410 | kfree(system->name); | |
e9dbfae5 SR |
411 | kfree(system); |
412 | } | |
413 | ||
414 | static void __get_system(struct event_subsystem *system) | |
415 | { | |
6e94a780 SR |
416 | WARN_ON_ONCE(system_refcount(system) == 0); |
417 | system_refcount_inc(system); | |
e9dbfae5 SR |
418 | } |
419 | ||
ae63b31e SR |
420 | static void __get_system_dir(struct ftrace_subsystem_dir *dir) |
421 | { | |
422 | WARN_ON_ONCE(dir->ref_count == 0); | |
423 | dir->ref_count++; | |
424 | __get_system(dir->subsystem); | |
425 | } | |
426 | ||
427 | static void __put_system_dir(struct ftrace_subsystem_dir *dir) | |
428 | { | |
429 | WARN_ON_ONCE(dir->ref_count == 0); | |
430 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 431 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
432 | |
433 | __put_system(dir->subsystem); | |
434 | if (!--dir->ref_count) | |
435 | kfree(dir); | |
436 | } | |
437 | ||
438 | static void put_system(struct ftrace_subsystem_dir *dir) | |
e9dbfae5 SR |
439 | { |
440 | mutex_lock(&event_mutex); | |
ae63b31e | 441 | __put_system_dir(dir); |
e9dbfae5 SR |
442 | mutex_unlock(&event_mutex); |
443 | } | |
444 | ||
f6a84bdc ON |
445 | static void remove_subsystem(struct ftrace_subsystem_dir *dir) |
446 | { | |
447 | if (!dir) | |
448 | return; | |
449 | ||
450 | if (!--dir->nr_events) { | |
451 | debugfs_remove_recursive(dir->entry); | |
452 | list_del(&dir->list); | |
453 | __put_system_dir(dir); | |
454 | } | |
455 | } | |
456 | ||
f6a84bdc ON |
457 | static void remove_event_file_dir(struct ftrace_event_file *file) |
458 | { | |
bf682c31 ON |
459 | struct dentry *dir = file->dir; |
460 | struct dentry *child; | |
461 | ||
462 | if (dir) { | |
463 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
464 | list_for_each_entry(child, &dir->d_subdirs, d_u.d_child) { | |
465 | if (child->d_inode) /* probably unneeded */ | |
466 | child->d_inode->i_private = NULL; | |
467 | } | |
468 | spin_unlock(&dir->d_lock); | |
469 | ||
470 | debugfs_remove_recursive(dir); | |
471 | } | |
472 | ||
f6a84bdc | 473 | list_del(&file->list); |
f6a84bdc | 474 | remove_subsystem(file->system); |
2448e349 | 475 | free_event_filter(file->filter); |
f6a84bdc ON |
476 | kmem_cache_free(file_cachep, file); |
477 | } | |
478 | ||
8f31bfe5 LZ |
479 | /* |
480 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
481 | */ | |
2a6c24af SRRH |
482 | static int |
483 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
484 | const char *sub, const char *event, int set) | |
b77e38aa | 485 | { |
ae63b31e | 486 | struct ftrace_event_file *file; |
a59fd602 | 487 | struct ftrace_event_call *call; |
de7b2973 | 488 | const char *name; |
29f93943 | 489 | int ret = -EINVAL; |
8f31bfe5 | 490 | |
ae63b31e SR |
491 | list_for_each_entry(file, &tr->events, list) { |
492 | ||
493 | call = file->event_call; | |
de7b2973 | 494 | name = ftrace_event_name(call); |
8f31bfe5 | 495 | |
de7b2973 | 496 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
497 | continue; |
498 | ||
9b63776f SR |
499 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
500 | continue; | |
501 | ||
8f31bfe5 | 502 | if (match && |
de7b2973 | 503 | strcmp(match, name) != 0 && |
8f082018 | 504 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
505 | continue; |
506 | ||
8f082018 | 507 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
508 | continue; |
509 | ||
de7b2973 | 510 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
511 | continue; |
512 | ||
ae63b31e | 513 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
514 | |
515 | ret = 0; | |
516 | } | |
2a6c24af SRRH |
517 | |
518 | return ret; | |
519 | } | |
520 | ||
521 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
522 | const char *sub, const char *event, int set) | |
523 | { | |
524 | int ret; | |
525 | ||
526 | mutex_lock(&event_mutex); | |
527 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
528 | mutex_unlock(&event_mutex); |
529 | ||
530 | return ret; | |
531 | } | |
532 | ||
ae63b31e | 533 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 534 | { |
b628b3e6 | 535 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
536 | |
537 | /* | |
538 | * The buf format can be <subsystem>:<event-name> | |
539 | * *:<event-name> means any event by that name. | |
540 | * :<event-name> is the same. | |
541 | * | |
542 | * <subsystem>:* means all events in that subsystem | |
543 | * <subsystem>: means the same. | |
544 | * | |
545 | * <name> (no ':') means all events in a subsystem with | |
546 | * the name <name> or any event that matches <name> | |
547 | */ | |
548 | ||
549 | match = strsep(&buf, ":"); | |
550 | if (buf) { | |
551 | sub = match; | |
552 | event = buf; | |
553 | match = NULL; | |
554 | ||
555 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
556 | sub = NULL; | |
557 | if (!strlen(event) || strcmp(event, "*") == 0) | |
558 | event = NULL; | |
559 | } | |
b77e38aa | 560 | |
ae63b31e | 561 | return __ftrace_set_clr_event(tr, match, sub, event, set); |
b77e38aa SR |
562 | } |
563 | ||
4671c794 SR |
564 | /** |
565 | * trace_set_clr_event - enable or disable an event | |
566 | * @system: system name to match (NULL for any system) | |
567 | * @event: event name to match (NULL for all events, within system) | |
568 | * @set: 1 to enable, 0 to disable | |
569 | * | |
570 | * This is a way for other parts of the kernel to enable or disable | |
571 | * event recording. | |
572 | * | |
573 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
574 | * registered events. | |
575 | */ | |
576 | int trace_set_clr_event(const char *system, const char *event, int set) | |
577 | { | |
ae63b31e SR |
578 | struct trace_array *tr = top_trace_array(); |
579 | ||
dc81e5e3 YY |
580 | if (!tr) |
581 | return -ENODEV; | |
582 | ||
ae63b31e | 583 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 584 | } |
56355b83 | 585 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 586 | |
b77e38aa SR |
587 | /* 128 should be much more than enough */ |
588 | #define EVENT_BUF_SIZE 127 | |
589 | ||
590 | static ssize_t | |
591 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
592 | size_t cnt, loff_t *ppos) | |
593 | { | |
48966364 | 594 | struct trace_parser parser; |
ae63b31e SR |
595 | struct seq_file *m = file->private_data; |
596 | struct trace_array *tr = m->private; | |
4ba7978e | 597 | ssize_t read, ret; |
b77e38aa | 598 | |
4ba7978e | 599 | if (!cnt) |
b77e38aa SR |
600 | return 0; |
601 | ||
1852fcce SR |
602 | ret = tracing_update_buffers(); |
603 | if (ret < 0) | |
604 | return ret; | |
605 | ||
48966364 | 606 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
607 | return -ENOMEM; |
608 | ||
48966364 | 609 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
610 | ||
4ba7978e | 611 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 612 | int set = 1; |
b77e38aa | 613 | |
48966364 | 614 | if (*parser.buffer == '!') |
b77e38aa | 615 | set = 0; |
b77e38aa | 616 | |
48966364 | 617 | parser.buffer[parser.idx] = 0; |
618 | ||
ae63b31e | 619 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 620 | if (ret) |
48966364 | 621 | goto out_put; |
b77e38aa | 622 | } |
b77e38aa SR |
623 | |
624 | ret = read; | |
625 | ||
48966364 | 626 | out_put: |
627 | trace_parser_put(&parser); | |
b77e38aa SR |
628 | |
629 | return ret; | |
630 | } | |
631 | ||
632 | static void * | |
633 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
634 | { | |
ae63b31e SR |
635 | struct ftrace_event_file *file = v; |
636 | struct ftrace_event_call *call; | |
637 | struct trace_array *tr = m->private; | |
b77e38aa SR |
638 | |
639 | (*pos)++; | |
640 | ||
ae63b31e SR |
641 | list_for_each_entry_continue(file, &tr->events, list) { |
642 | call = file->event_call; | |
40e26815 SR |
643 | /* |
644 | * The ftrace subsystem is for showing formats only. | |
645 | * They can not be enabled or disabled via the event files. | |
646 | */ | |
a1d0ce82 | 647 | if (call->class && call->class->reg) |
ae63b31e | 648 | return file; |
40e26815 | 649 | } |
b77e38aa | 650 | |
30bd39cd | 651 | return NULL; |
b77e38aa SR |
652 | } |
653 | ||
654 | static void *t_start(struct seq_file *m, loff_t *pos) | |
655 | { | |
ae63b31e SR |
656 | struct ftrace_event_file *file; |
657 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
658 | loff_t l; |
659 | ||
20c8928a | 660 | mutex_lock(&event_mutex); |
e1c7e2a6 | 661 | |
ae63b31e | 662 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 663 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
664 | file = t_next(m, file, &l); |
665 | if (!file) | |
e1c7e2a6 LZ |
666 | break; |
667 | } | |
ae63b31e | 668 | return file; |
b77e38aa SR |
669 | } |
670 | ||
671 | static void * | |
672 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
673 | { | |
ae63b31e SR |
674 | struct ftrace_event_file *file = v; |
675 | struct trace_array *tr = m->private; | |
b77e38aa SR |
676 | |
677 | (*pos)++; | |
678 | ||
ae63b31e SR |
679 | list_for_each_entry_continue(file, &tr->events, list) { |
680 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
681 | return file; | |
b77e38aa SR |
682 | } |
683 | ||
30bd39cd | 684 | return NULL; |
b77e38aa SR |
685 | } |
686 | ||
687 | static void *s_start(struct seq_file *m, loff_t *pos) | |
688 | { | |
ae63b31e SR |
689 | struct ftrace_event_file *file; |
690 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
691 | loff_t l; |
692 | ||
20c8928a | 693 | mutex_lock(&event_mutex); |
e1c7e2a6 | 694 | |
ae63b31e | 695 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 696 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
697 | file = s_next(m, file, &l); |
698 | if (!file) | |
e1c7e2a6 LZ |
699 | break; |
700 | } | |
ae63b31e | 701 | return file; |
b77e38aa SR |
702 | } |
703 | ||
704 | static int t_show(struct seq_file *m, void *v) | |
705 | { | |
ae63b31e SR |
706 | struct ftrace_event_file *file = v; |
707 | struct ftrace_event_call *call = file->event_call; | |
b77e38aa | 708 | |
8f082018 SR |
709 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
710 | seq_printf(m, "%s:", call->class->system); | |
de7b2973 | 711 | seq_printf(m, "%s\n", ftrace_event_name(call)); |
b77e38aa SR |
712 | |
713 | return 0; | |
714 | } | |
715 | ||
716 | static void t_stop(struct seq_file *m, void *p) | |
717 | { | |
20c8928a | 718 | mutex_unlock(&event_mutex); |
b77e38aa SR |
719 | } |
720 | ||
1473e441 SR |
721 | static ssize_t |
722 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
723 | loff_t *ppos) | |
724 | { | |
bc6f6b08 ON |
725 | struct ftrace_event_file *file; |
726 | unsigned long flags; | |
a4390596 TZ |
727 | char buf[4] = "0"; |
728 | ||
bc6f6b08 ON |
729 | mutex_lock(&event_mutex); |
730 | file = event_file_data(filp); | |
731 | if (likely(file)) | |
732 | flags = file->flags; | |
733 | mutex_unlock(&event_mutex); | |
734 | ||
735 | if (!file) | |
736 | return -ENODEV; | |
737 | ||
738 | if (flags & FTRACE_EVENT_FL_ENABLED && | |
739 | !(flags & FTRACE_EVENT_FL_SOFT_DISABLED)) | |
a4390596 TZ |
740 | strcpy(buf, "1"); |
741 | ||
bc6f6b08 ON |
742 | if (flags & FTRACE_EVENT_FL_SOFT_DISABLED || |
743 | flags & FTRACE_EVENT_FL_SOFT_MODE) | |
a4390596 TZ |
744 | strcat(buf, "*"); |
745 | ||
746 | strcat(buf, "\n"); | |
1473e441 | 747 | |
417944c4 | 748 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
749 | } |
750 | ||
751 | static ssize_t | |
752 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
753 | loff_t *ppos) | |
754 | { | |
bc6f6b08 | 755 | struct ftrace_event_file *file; |
1473e441 SR |
756 | unsigned long val; |
757 | int ret; | |
758 | ||
22fe9b54 PH |
759 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
760 | if (ret) | |
1473e441 SR |
761 | return ret; |
762 | ||
1852fcce SR |
763 | ret = tracing_update_buffers(); |
764 | if (ret < 0) | |
765 | return ret; | |
766 | ||
1473e441 SR |
767 | switch (val) { |
768 | case 0: | |
1473e441 | 769 | case 1: |
bc6f6b08 | 770 | ret = -ENODEV; |
11a241a3 | 771 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
772 | file = event_file_data(filp); |
773 | if (likely(file)) | |
774 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 775 | mutex_unlock(&event_mutex); |
1473e441 SR |
776 | break; |
777 | ||
778 | default: | |
779 | return -EINVAL; | |
780 | } | |
781 | ||
782 | *ppos += cnt; | |
783 | ||
3b8e4273 | 784 | return ret ? ret : cnt; |
1473e441 SR |
785 | } |
786 | ||
8ae79a13 SR |
787 | static ssize_t |
788 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
789 | loff_t *ppos) | |
790 | { | |
c142b15d | 791 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
ae63b31e SR |
792 | struct ftrace_subsystem_dir *dir = filp->private_data; |
793 | struct event_subsystem *system = dir->subsystem; | |
8ae79a13 | 794 | struct ftrace_event_call *call; |
ae63b31e SR |
795 | struct ftrace_event_file *file; |
796 | struct trace_array *tr = dir->tr; | |
8ae79a13 | 797 | char buf[2]; |
c142b15d | 798 | int set = 0; |
8ae79a13 SR |
799 | int ret; |
800 | ||
8ae79a13 | 801 | mutex_lock(&event_mutex); |
ae63b31e SR |
802 | list_for_each_entry(file, &tr->events, list) { |
803 | call = file->event_call; | |
de7b2973 | 804 | if (!ftrace_event_name(call) || !call->class || !call->class->reg) |
8ae79a13 SR |
805 | continue; |
806 | ||
40ee4dff | 807 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
808 | continue; |
809 | ||
810 | /* | |
811 | * We need to find out if all the events are set | |
812 | * or if all events or cleared, or if we have | |
813 | * a mixture. | |
814 | */ | |
ae63b31e | 815 | set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED)); |
c142b15d | 816 | |
8ae79a13 SR |
817 | /* |
818 | * If we have a mixture, no need to look further. | |
819 | */ | |
c142b15d | 820 | if (set == 3) |
8ae79a13 SR |
821 | break; |
822 | } | |
823 | mutex_unlock(&event_mutex); | |
824 | ||
c142b15d | 825 | buf[0] = set_to_char[set]; |
8ae79a13 | 826 | buf[1] = '\n'; |
8ae79a13 SR |
827 | |
828 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
829 | ||
830 | return ret; | |
831 | } | |
832 | ||
833 | static ssize_t | |
834 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
835 | loff_t *ppos) | |
836 | { | |
ae63b31e SR |
837 | struct ftrace_subsystem_dir *dir = filp->private_data; |
838 | struct event_subsystem *system = dir->subsystem; | |
40ee4dff | 839 | const char *name = NULL; |
8ae79a13 | 840 | unsigned long val; |
8ae79a13 SR |
841 | ssize_t ret; |
842 | ||
22fe9b54 PH |
843 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
844 | if (ret) | |
8ae79a13 SR |
845 | return ret; |
846 | ||
847 | ret = tracing_update_buffers(); | |
848 | if (ret < 0) | |
849 | return ret; | |
850 | ||
8f31bfe5 | 851 | if (val != 0 && val != 1) |
8ae79a13 | 852 | return -EINVAL; |
8ae79a13 | 853 | |
40ee4dff SR |
854 | /* |
855 | * Opening of "enable" adds a ref count to system, | |
856 | * so the name is safe to use. | |
857 | */ | |
858 | if (system) | |
859 | name = system->name; | |
860 | ||
ae63b31e | 861 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 862 | if (ret) |
8f31bfe5 | 863 | goto out; |
8ae79a13 SR |
864 | |
865 | ret = cnt; | |
866 | ||
8f31bfe5 | 867 | out: |
8ae79a13 SR |
868 | *ppos += cnt; |
869 | ||
870 | return ret; | |
871 | } | |
872 | ||
2a37a3df SR |
873 | enum { |
874 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
875 | FORMAT_FIELD_SEPERATOR = 2, |
876 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
877 | }; |
878 | ||
879 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 880 | { |
c5a44a12 | 881 | struct ftrace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
882 | struct list_head *common_head = &ftrace_common_fields; |
883 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 884 | struct list_head *node = v; |
981d081e | 885 | |
2a37a3df | 886 | (*pos)++; |
5a65e956 | 887 | |
2a37a3df SR |
888 | switch ((unsigned long)v) { |
889 | case FORMAT_HEADER: | |
7710b639 ON |
890 | node = common_head; |
891 | break; | |
5a65e956 | 892 | |
86397dc3 | 893 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
894 | node = head; |
895 | break; | |
5a65e956 | 896 | |
2a37a3df SR |
897 | case FORMAT_PRINTFMT: |
898 | /* all done */ | |
899 | return NULL; | |
5a65e956 LJ |
900 | } |
901 | ||
7710b639 ON |
902 | node = node->prev; |
903 | if (node == common_head) | |
86397dc3 | 904 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 905 | else if (node == head) |
2a37a3df | 906 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
907 | else |
908 | return node; | |
2a37a3df SR |
909 | } |
910 | ||
911 | static int f_show(struct seq_file *m, void *v) | |
912 | { | |
c5a44a12 | 913 | struct ftrace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
914 | struct ftrace_event_field *field; |
915 | const char *array_descriptor; | |
916 | ||
917 | switch ((unsigned long)v) { | |
918 | case FORMAT_HEADER: | |
de7b2973 | 919 | seq_printf(m, "name: %s\n", ftrace_event_name(call)); |
2a37a3df | 920 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 921 | seq_puts(m, "format:\n"); |
8728fe50 | 922 | return 0; |
5a65e956 | 923 | |
86397dc3 LZ |
924 | case FORMAT_FIELD_SEPERATOR: |
925 | seq_putc(m, '\n'); | |
926 | return 0; | |
927 | ||
2a37a3df SR |
928 | case FORMAT_PRINTFMT: |
929 | seq_printf(m, "\nprint fmt: %s\n", | |
930 | call->print_fmt); | |
931 | return 0; | |
981d081e | 932 | } |
8728fe50 | 933 | |
7710b639 | 934 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
935 | /* |
936 | * Smartly shows the array type(except dynamic array). | |
937 | * Normal: | |
938 | * field:TYPE VAR | |
939 | * If TYPE := TYPE[LEN], it is shown: | |
940 | * field:TYPE VAR[LEN] | |
941 | */ | |
942 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 943 | |
2a37a3df SR |
944 | if (!strncmp(field->type, "__data_loc", 10)) |
945 | array_descriptor = NULL; | |
8728fe50 | 946 | |
2a37a3df SR |
947 | if (!array_descriptor) |
948 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
949 | field->type, field->name, field->offset, | |
950 | field->size, !!field->is_signed); | |
951 | else | |
952 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
953 | (int)(array_descriptor - field->type), | |
954 | field->type, field->name, | |
955 | array_descriptor, field->offset, | |
956 | field->size, !!field->is_signed); | |
8728fe50 | 957 | |
2a37a3df SR |
958 | return 0; |
959 | } | |
5a65e956 | 960 | |
7710b639 ON |
961 | static void *f_start(struct seq_file *m, loff_t *pos) |
962 | { | |
963 | void *p = (void *)FORMAT_HEADER; | |
964 | loff_t l = 0; | |
965 | ||
c5a44a12 ON |
966 | /* ->stop() is called even if ->start() fails */ |
967 | mutex_lock(&event_mutex); | |
968 | if (!event_file_data(m->private)) | |
969 | return ERR_PTR(-ENODEV); | |
970 | ||
7710b639 ON |
971 | while (l < *pos && p) |
972 | p = f_next(m, p, &l); | |
973 | ||
974 | return p; | |
975 | } | |
976 | ||
2a37a3df SR |
977 | static void f_stop(struct seq_file *m, void *p) |
978 | { | |
c5a44a12 | 979 | mutex_unlock(&event_mutex); |
2a37a3df | 980 | } |
981d081e | 981 | |
2a37a3df SR |
982 | static const struct seq_operations trace_format_seq_ops = { |
983 | .start = f_start, | |
984 | .next = f_next, | |
985 | .stop = f_stop, | |
986 | .show = f_show, | |
987 | }; | |
988 | ||
989 | static int trace_format_open(struct inode *inode, struct file *file) | |
990 | { | |
2a37a3df SR |
991 | struct seq_file *m; |
992 | int ret; | |
993 | ||
994 | ret = seq_open(file, &trace_format_seq_ops); | |
995 | if (ret < 0) | |
996 | return ret; | |
997 | ||
998 | m = file->private_data; | |
c5a44a12 | 999 | m->private = file; |
2a37a3df SR |
1000 | |
1001 | return 0; | |
981d081e SR |
1002 | } |
1003 | ||
23725aee PZ |
1004 | static ssize_t |
1005 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1006 | { | |
1a11126b | 1007 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1008 | char buf[32]; |
1009 | int len; | |
23725aee PZ |
1010 | |
1011 | if (*ppos) | |
1012 | return 0; | |
1013 | ||
1a11126b ON |
1014 | if (unlikely(!id)) |
1015 | return -ENODEV; | |
1016 | ||
1017 | len = sprintf(buf, "%d\n", id); | |
1018 | ||
cd458ba9 | 1019 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1020 | } |
1021 | ||
7ce7e424 TZ |
1022 | static ssize_t |
1023 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1024 | loff_t *ppos) | |
1025 | { | |
f306cc82 | 1026 | struct ftrace_event_file *file; |
7ce7e424 | 1027 | struct trace_seq *s; |
e2912b09 | 1028 | int r = -ENODEV; |
7ce7e424 TZ |
1029 | |
1030 | if (*ppos) | |
1031 | return 0; | |
1032 | ||
1033 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1034 | |
7ce7e424 TZ |
1035 | if (!s) |
1036 | return -ENOMEM; | |
1037 | ||
1038 | trace_seq_init(s); | |
1039 | ||
e2912b09 | 1040 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1041 | file = event_file_data(filp); |
1042 | if (file) | |
1043 | print_event_filter(file, s); | |
e2912b09 ON |
1044 | mutex_unlock(&event_mutex); |
1045 | ||
f306cc82 | 1046 | if (file) |
5ac48378 SRRH |
1047 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1048 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1049 | |
1050 | kfree(s); | |
1051 | ||
1052 | return r; | |
1053 | } | |
1054 | ||
1055 | static ssize_t | |
1056 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1057 | loff_t *ppos) | |
1058 | { | |
f306cc82 | 1059 | struct ftrace_event_file *file; |
8b372562 | 1060 | char *buf; |
e2912b09 | 1061 | int err = -ENODEV; |
7ce7e424 | 1062 | |
8b372562 | 1063 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1064 | return -EINVAL; |
1065 | ||
8b372562 TZ |
1066 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1067 | if (!buf) | |
7ce7e424 TZ |
1068 | return -ENOMEM; |
1069 | ||
8b372562 TZ |
1070 | if (copy_from_user(buf, ubuf, cnt)) { |
1071 | free_page((unsigned long) buf); | |
1072 | return -EFAULT; | |
7ce7e424 | 1073 | } |
8b372562 | 1074 | buf[cnt] = '\0'; |
7ce7e424 | 1075 | |
e2912b09 | 1076 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1077 | file = event_file_data(filp); |
1078 | if (file) | |
1079 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1080 | mutex_unlock(&event_mutex); |
1081 | ||
8b372562 TZ |
1082 | free_page((unsigned long) buf); |
1083 | if (err < 0) | |
44e9c8b7 | 1084 | return err; |
0a19e53c | 1085 | |
7ce7e424 TZ |
1086 | *ppos += cnt; |
1087 | ||
1088 | return cnt; | |
1089 | } | |
1090 | ||
e9dbfae5 SR |
1091 | static LIST_HEAD(event_subsystems); |
1092 | ||
1093 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1094 | { | |
1095 | struct event_subsystem *system = NULL; | |
ae63b31e SR |
1096 | struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
1097 | struct trace_array *tr; | |
e9dbfae5 SR |
1098 | int ret; |
1099 | ||
d6d3523c GB |
1100 | if (tracing_is_disabled()) |
1101 | return -ENODEV; | |
1102 | ||
e9dbfae5 | 1103 | /* Make sure the system still exists */ |
a8227415 | 1104 | mutex_lock(&trace_types_lock); |
e9dbfae5 | 1105 | mutex_lock(&event_mutex); |
ae63b31e SR |
1106 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1107 | list_for_each_entry(dir, &tr->systems, list) { | |
1108 | if (dir == inode->i_private) { | |
1109 | /* Don't open systems with no events */ | |
1110 | if (dir->nr_events) { | |
1111 | __get_system_dir(dir); | |
1112 | system = dir->subsystem; | |
1113 | } | |
1114 | goto exit_loop; | |
e9dbfae5 | 1115 | } |
e9dbfae5 SR |
1116 | } |
1117 | } | |
ae63b31e | 1118 | exit_loop: |
e9dbfae5 | 1119 | mutex_unlock(&event_mutex); |
a8227415 | 1120 | mutex_unlock(&trace_types_lock); |
e9dbfae5 | 1121 | |
ae63b31e | 1122 | if (!system) |
e9dbfae5 SR |
1123 | return -ENODEV; |
1124 | ||
ae63b31e SR |
1125 | /* Some versions of gcc think dir can be uninitialized here */ |
1126 | WARN_ON(!dir); | |
1127 | ||
8e2e2fa4 SRRH |
1128 | /* Still need to increment the ref count of the system */ |
1129 | if (trace_array_get(tr) < 0) { | |
1130 | put_system(dir); | |
1131 | return -ENODEV; | |
1132 | } | |
1133 | ||
e9dbfae5 | 1134 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1135 | if (ret < 0) { |
1136 | trace_array_put(tr); | |
ae63b31e | 1137 | put_system(dir); |
8e2e2fa4 | 1138 | } |
ae63b31e SR |
1139 | |
1140 | return ret; | |
1141 | } | |
1142 | ||
1143 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1144 | { | |
1145 | struct ftrace_subsystem_dir *dir; | |
1146 | struct trace_array *tr = inode->i_private; | |
1147 | int ret; | |
1148 | ||
d6d3523c GB |
1149 | if (tracing_is_disabled()) |
1150 | return -ENODEV; | |
1151 | ||
8e2e2fa4 SRRH |
1152 | if (trace_array_get(tr) < 0) |
1153 | return -ENODEV; | |
1154 | ||
ae63b31e SR |
1155 | /* Make a temporary dir that has no system but points to tr */ |
1156 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
8e2e2fa4 SRRH |
1157 | if (!dir) { |
1158 | trace_array_put(tr); | |
ae63b31e | 1159 | return -ENOMEM; |
8e2e2fa4 | 1160 | } |
ae63b31e SR |
1161 | |
1162 | dir->tr = tr; | |
1163 | ||
1164 | ret = tracing_open_generic(inode, filp); | |
8e2e2fa4 SRRH |
1165 | if (ret < 0) { |
1166 | trace_array_put(tr); | |
ae63b31e | 1167 | kfree(dir); |
d6d3523c | 1168 | return ret; |
8e2e2fa4 | 1169 | } |
ae63b31e SR |
1170 | |
1171 | filp->private_data = dir; | |
e9dbfae5 | 1172 | |
d6d3523c | 1173 | return 0; |
e9dbfae5 SR |
1174 | } |
1175 | ||
1176 | static int subsystem_release(struct inode *inode, struct file *file) | |
1177 | { | |
ae63b31e | 1178 | struct ftrace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1179 | |
8e2e2fa4 SRRH |
1180 | trace_array_put(dir->tr); |
1181 | ||
ae63b31e SR |
1182 | /* |
1183 | * If dir->subsystem is NULL, then this is a temporary | |
1184 | * descriptor that was made for a trace_array to enable | |
1185 | * all subsystems. | |
1186 | */ | |
1187 | if (dir->subsystem) | |
1188 | put_system(dir); | |
1189 | else | |
1190 | kfree(dir); | |
e9dbfae5 SR |
1191 | |
1192 | return 0; | |
1193 | } | |
1194 | ||
cfb180f3 TZ |
1195 | static ssize_t |
1196 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1197 | loff_t *ppos) | |
1198 | { | |
ae63b31e SR |
1199 | struct ftrace_subsystem_dir *dir = filp->private_data; |
1200 | struct event_subsystem *system = dir->subsystem; | |
cfb180f3 TZ |
1201 | struct trace_seq *s; |
1202 | int r; | |
1203 | ||
1204 | if (*ppos) | |
1205 | return 0; | |
1206 | ||
1207 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1208 | if (!s) | |
1209 | return -ENOMEM; | |
1210 | ||
1211 | trace_seq_init(s); | |
1212 | ||
8b372562 | 1213 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1214 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1215 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1216 | |
1217 | kfree(s); | |
1218 | ||
1219 | return r; | |
1220 | } | |
1221 | ||
1222 | static ssize_t | |
1223 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1224 | loff_t *ppos) | |
1225 | { | |
ae63b31e | 1226 | struct ftrace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1227 | char *buf; |
cfb180f3 TZ |
1228 | int err; |
1229 | ||
8b372562 | 1230 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1231 | return -EINVAL; |
1232 | ||
8b372562 TZ |
1233 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1234 | if (!buf) | |
cfb180f3 TZ |
1235 | return -ENOMEM; |
1236 | ||
8b372562 TZ |
1237 | if (copy_from_user(buf, ubuf, cnt)) { |
1238 | free_page((unsigned long) buf); | |
1239 | return -EFAULT; | |
cfb180f3 | 1240 | } |
8b372562 | 1241 | buf[cnt] = '\0'; |
cfb180f3 | 1242 | |
ae63b31e | 1243 | err = apply_subsystem_event_filter(dir, buf); |
8b372562 TZ |
1244 | free_page((unsigned long) buf); |
1245 | if (err < 0) | |
44e9c8b7 | 1246 | return err; |
cfb180f3 TZ |
1247 | |
1248 | *ppos += cnt; | |
1249 | ||
1250 | return cnt; | |
1251 | } | |
1252 | ||
d1b182a8 SR |
1253 | static ssize_t |
1254 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1255 | { | |
1256 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1257 | struct trace_seq *s; | |
1258 | int r; | |
1259 | ||
1260 | if (*ppos) | |
1261 | return 0; | |
1262 | ||
1263 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1264 | if (!s) | |
1265 | return -ENOMEM; | |
1266 | ||
1267 | trace_seq_init(s); | |
1268 | ||
1269 | func(s); | |
5ac48378 SRRH |
1270 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1271 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1272 | |
1273 | kfree(s); | |
1274 | ||
1275 | return r; | |
1276 | } | |
1277 | ||
15075cac SR |
1278 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1279 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
f77d09a3 | 1280 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1281 | |
b77e38aa SR |
1282 | static const struct seq_operations show_event_seq_ops = { |
1283 | .start = t_start, | |
1284 | .next = t_next, | |
1285 | .show = t_show, | |
1286 | .stop = t_stop, | |
1287 | }; | |
1288 | ||
1289 | static const struct seq_operations show_set_event_seq_ops = { | |
1290 | .start = s_start, | |
1291 | .next = s_next, | |
1292 | .show = t_show, | |
1293 | .stop = t_stop, | |
1294 | }; | |
1295 | ||
2314c4ae | 1296 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1297 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1298 | .read = seq_read, |
1299 | .llseek = seq_lseek, | |
1300 | .release = seq_release, | |
1301 | }; | |
1302 | ||
b77e38aa | 1303 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1304 | .open = ftrace_event_set_open, |
b77e38aa SR |
1305 | .read = seq_read, |
1306 | .write = ftrace_event_write, | |
1307 | .llseek = seq_lseek, | |
f77d09a3 | 1308 | .release = ftrace_event_release, |
b77e38aa SR |
1309 | }; |
1310 | ||
1473e441 | 1311 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 1312 | .open = tracing_open_generic, |
1473e441 SR |
1313 | .read = event_enable_read, |
1314 | .write = event_enable_write, | |
6038f373 | 1315 | .llseek = default_llseek, |
1473e441 SR |
1316 | }; |
1317 | ||
981d081e | 1318 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1319 | .open = trace_format_open, |
1320 | .read = seq_read, | |
1321 | .llseek = seq_lseek, | |
1322 | .release = seq_release, | |
981d081e SR |
1323 | }; |
1324 | ||
23725aee | 1325 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1326 | .read = event_id_read, |
6038f373 | 1327 | .llseek = default_llseek, |
23725aee PZ |
1328 | }; |
1329 | ||
7ce7e424 TZ |
1330 | static const struct file_operations ftrace_event_filter_fops = { |
1331 | .open = tracing_open_generic, | |
1332 | .read = event_filter_read, | |
1333 | .write = event_filter_write, | |
6038f373 | 1334 | .llseek = default_llseek, |
7ce7e424 TZ |
1335 | }; |
1336 | ||
cfb180f3 | 1337 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1338 | .open = subsystem_open, |
cfb180f3 TZ |
1339 | .read = subsystem_filter_read, |
1340 | .write = subsystem_filter_write, | |
6038f373 | 1341 | .llseek = default_llseek, |
e9dbfae5 | 1342 | .release = subsystem_release, |
cfb180f3 TZ |
1343 | }; |
1344 | ||
8ae79a13 | 1345 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1346 | .open = subsystem_open, |
8ae79a13 SR |
1347 | .read = system_enable_read, |
1348 | .write = system_enable_write, | |
6038f373 | 1349 | .llseek = default_llseek, |
40ee4dff | 1350 | .release = subsystem_release, |
8ae79a13 SR |
1351 | }; |
1352 | ||
ae63b31e SR |
1353 | static const struct file_operations ftrace_tr_enable_fops = { |
1354 | .open = system_tr_open, | |
1355 | .read = system_enable_read, | |
1356 | .write = system_enable_write, | |
1357 | .llseek = default_llseek, | |
1358 | .release = subsystem_release, | |
1359 | }; | |
1360 | ||
d1b182a8 SR |
1361 | static const struct file_operations ftrace_show_header_fops = { |
1362 | .open = tracing_open_generic, | |
1363 | .read = show_header, | |
6038f373 | 1364 | .llseek = default_llseek, |
d1b182a8 SR |
1365 | }; |
1366 | ||
ae63b31e SR |
1367 | static int |
1368 | ftrace_event_open(struct inode *inode, struct file *file, | |
1369 | const struct seq_operations *seq_ops) | |
1473e441 | 1370 | { |
ae63b31e SR |
1371 | struct seq_file *m; |
1372 | int ret; | |
1473e441 | 1373 | |
ae63b31e SR |
1374 | ret = seq_open(file, seq_ops); |
1375 | if (ret < 0) | |
1376 | return ret; | |
1377 | m = file->private_data; | |
1378 | /* copy tr over to seq ops */ | |
1379 | m->private = inode->i_private; | |
1473e441 | 1380 | |
ae63b31e | 1381 | return ret; |
1473e441 SR |
1382 | } |
1383 | ||
f77d09a3 AL |
1384 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1385 | { | |
1386 | struct trace_array *tr = inode->i_private; | |
1387 | ||
1388 | trace_array_put(tr); | |
1389 | ||
1390 | return seq_release(inode, file); | |
1391 | } | |
1392 | ||
15075cac SR |
1393 | static int |
1394 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1395 | { | |
1396 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1397 | ||
ae63b31e | 1398 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1399 | } |
1400 | ||
1401 | static int | |
1402 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1403 | { | |
1404 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1405 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
1406 | int ret; |
1407 | ||
1408 | if (trace_array_get(tr) < 0) | |
1409 | return -ENODEV; | |
15075cac SR |
1410 | |
1411 | if ((file->f_mode & FMODE_WRITE) && | |
1412 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1413 | ftrace_clear_events(tr); |
15075cac | 1414 | |
f77d09a3 AL |
1415 | ret = ftrace_event_open(inode, file, seq_ops); |
1416 | if (ret < 0) | |
1417 | trace_array_put(tr); | |
1418 | return ret; | |
ae63b31e SR |
1419 | } |
1420 | ||
1421 | static struct event_subsystem * | |
1422 | create_new_subsystem(const char *name) | |
1423 | { | |
1424 | struct event_subsystem *system; | |
1425 | ||
1426 | /* need to create new entry */ | |
1427 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1428 | if (!system) | |
1429 | return NULL; | |
1430 | ||
1431 | system->ref_count = 1; | |
6e94a780 SR |
1432 | |
1433 | /* Only allocate if dynamic (kprobes and modules) */ | |
1434 | if (!core_kernel_data((unsigned long)name)) { | |
1435 | system->ref_count |= SYSTEM_FL_FREE_NAME; | |
1436 | system->name = kstrdup(name, GFP_KERNEL); | |
1437 | if (!system->name) | |
1438 | goto out_free; | |
1439 | } else | |
1440 | system->name = name; | |
ae63b31e SR |
1441 | |
1442 | system->filter = NULL; | |
1443 | ||
1444 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1445 | if (!system->filter) | |
1446 | goto out_free; | |
1447 | ||
1448 | list_add(&system->list, &event_subsystems); | |
1449 | ||
1450 | return system; | |
1451 | ||
1452 | out_free: | |
6e94a780 SR |
1453 | if (system->ref_count & SYSTEM_FL_FREE_NAME) |
1454 | kfree(system->name); | |
ae63b31e SR |
1455 | kfree(system); |
1456 | return NULL; | |
15075cac SR |
1457 | } |
1458 | ||
6ecc2d1c | 1459 | static struct dentry * |
ae63b31e SR |
1460 | event_subsystem_dir(struct trace_array *tr, const char *name, |
1461 | struct ftrace_event_file *file, struct dentry *parent) | |
6ecc2d1c | 1462 | { |
ae63b31e | 1463 | struct ftrace_subsystem_dir *dir; |
6ecc2d1c | 1464 | struct event_subsystem *system; |
e1112b4d | 1465 | struct dentry *entry; |
6ecc2d1c SR |
1466 | |
1467 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1468 | list_for_each_entry(dir, &tr->systems, list) { |
1469 | system = dir->subsystem; | |
dc82ec98 | 1470 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1471 | dir->nr_events++; |
1472 | file->system = dir; | |
1473 | return dir->entry; | |
dc82ec98 | 1474 | } |
6ecc2d1c SR |
1475 | } |
1476 | ||
ae63b31e SR |
1477 | /* Now see if the system itself exists. */ |
1478 | list_for_each_entry(system, &event_subsystems, list) { | |
1479 | if (strcmp(system->name, name) == 0) | |
1480 | break; | |
6ecc2d1c | 1481 | } |
ae63b31e SR |
1482 | /* Reset system variable when not found */ |
1483 | if (&system->list == &event_subsystems) | |
1484 | system = NULL; | |
6ecc2d1c | 1485 | |
ae63b31e SR |
1486 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1487 | if (!dir) | |
1488 | goto out_fail; | |
6ecc2d1c | 1489 | |
ae63b31e SR |
1490 | if (!system) { |
1491 | system = create_new_subsystem(name); | |
1492 | if (!system) | |
1493 | goto out_free; | |
1494 | } else | |
1495 | __get_system(system); | |
1496 | ||
1497 | dir->entry = debugfs_create_dir(name, parent); | |
1498 | if (!dir->entry) { | |
3448bac3 | 1499 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
1500 | __put_system(system); |
1501 | goto out_free; | |
6d723736 SR |
1502 | } |
1503 | ||
ae63b31e SR |
1504 | dir->tr = tr; |
1505 | dir->ref_count = 1; | |
1506 | dir->nr_events = 1; | |
1507 | dir->subsystem = system; | |
1508 | file->system = dir; | |
8b372562 | 1509 | |
ae63b31e | 1510 | entry = debugfs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1511 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1512 | if (!entry) { |
1513 | kfree(system->filter); | |
1514 | system->filter = NULL; | |
3448bac3 | 1515 | pr_warn("Could not create debugfs '%s/filter' entry\n", name); |
8b372562 | 1516 | } |
e1112b4d | 1517 | |
ae63b31e | 1518 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1519 | &ftrace_system_enable_fops); |
8ae79a13 | 1520 | |
ae63b31e SR |
1521 | list_add(&dir->list, &tr->systems); |
1522 | ||
1523 | return dir->entry; | |
1524 | ||
1525 | out_free: | |
1526 | kfree(dir); | |
1527 | out_fail: | |
1528 | /* Only print this message if failed on memory allocation */ | |
1529 | if (!dir || !system) | |
3448bac3 | 1530 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 1531 | return NULL; |
6ecc2d1c SR |
1532 | } |
1533 | ||
1473e441 | 1534 | static int |
620a30e9 | 1535 | event_create_dir(struct dentry *parent, struct ftrace_event_file *file) |
1473e441 | 1536 | { |
ae63b31e SR |
1537 | struct ftrace_event_call *call = file->event_call; |
1538 | struct trace_array *tr = file->tr; | |
2e33af02 | 1539 | struct list_head *head; |
ae63b31e | 1540 | struct dentry *d_events; |
de7b2973 | 1541 | const char *name; |
fd994989 | 1542 | int ret; |
1473e441 | 1543 | |
6ecc2d1c SR |
1544 | /* |
1545 | * If the trace point header did not define TRACE_SYSTEM | |
1546 | * then the system would be called "TRACE_SYSTEM". | |
1547 | */ | |
ae63b31e SR |
1548 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1549 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1550 | if (!d_events) | |
1551 | return -ENOMEM; | |
1552 | } else | |
1553 | d_events = parent; | |
1554 | ||
de7b2973 MD |
1555 | name = ftrace_event_name(call); |
1556 | file->dir = debugfs_create_dir(name, d_events); | |
ae63b31e | 1557 | if (!file->dir) { |
3448bac3 | 1558 | pr_warn("Could not create debugfs '%s' directory\n", name); |
1473e441 SR |
1559 | return -1; |
1560 | } | |
1561 | ||
9b63776f | 1562 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1563 | trace_create_file("enable", 0644, file->dir, file, |
620a30e9 | 1564 | &ftrace_enable_fops); |
1473e441 | 1565 | |
2239291a | 1566 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1567 | if (call->event.type && call->class->reg) |
1a11126b | 1568 | trace_create_file("id", 0444, file->dir, |
620a30e9 ON |
1569 | (void *)(long)call->event.type, |
1570 | &ftrace_event_id_fops); | |
2239291a | 1571 | #endif |
23725aee | 1572 | |
c9d932cf LZ |
1573 | /* |
1574 | * Other events may have the same class. Only update | |
1575 | * the fields if they are not already defined. | |
1576 | */ | |
1577 | head = trace_get_fields(call); | |
1578 | if (list_empty(head)) { | |
1579 | ret = call->class->define_fields(call); | |
1580 | if (ret < 0) { | |
3448bac3 FF |
1581 | pr_warn("Could not initialize trace point events/%s\n", |
1582 | name); | |
ae63b31e | 1583 | return -1; |
cf027f64 TZ |
1584 | } |
1585 | } | |
f306cc82 | 1586 | trace_create_file("filter", 0644, file->dir, file, |
620a30e9 | 1587 | &ftrace_event_filter_fops); |
cf027f64 | 1588 | |
85f2b082 TZ |
1589 | trace_create_file("trigger", 0644, file->dir, file, |
1590 | &event_trigger_fops); | |
1591 | ||
ae63b31e | 1592 | trace_create_file("format", 0444, file->dir, call, |
620a30e9 | 1593 | &ftrace_event_format_fops); |
6d723736 SR |
1594 | |
1595 | return 0; | |
1596 | } | |
1597 | ||
ae63b31e SR |
1598 | static void remove_event_from_tracers(struct ftrace_event_call *call) |
1599 | { | |
1600 | struct ftrace_event_file *file; | |
1601 | struct trace_array *tr; | |
1602 | ||
1603 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
1604 | if (file->event_call != call) |
1605 | continue; | |
1606 | ||
f6a84bdc | 1607 | remove_event_file_dir(file); |
ae63b31e SR |
1608 | /* |
1609 | * The do_for_each_event_file_safe() is | |
1610 | * a double loop. After finding the call for this | |
1611 | * trace_array, we use break to jump to the next | |
1612 | * trace_array. | |
1613 | */ | |
1614 | break; | |
1615 | } while_for_each_event_file(); | |
1616 | } | |
1617 | ||
8781915a EG |
1618 | static void event_remove(struct ftrace_event_call *call) |
1619 | { | |
ae63b31e SR |
1620 | struct trace_array *tr; |
1621 | struct ftrace_event_file *file; | |
1622 | ||
1623 | do_for_each_event_file(tr, file) { | |
1624 | if (file->event_call != call) | |
1625 | continue; | |
1626 | ftrace_event_enable_disable(file, 0); | |
1627 | /* | |
1628 | * The do_for_each_event_file() is | |
1629 | * a double loop. After finding the call for this | |
1630 | * trace_array, we use break to jump to the next | |
1631 | * trace_array. | |
1632 | */ | |
1633 | break; | |
1634 | } while_for_each_event_file(); | |
1635 | ||
8781915a EG |
1636 | if (call->event.funcs) |
1637 | __unregister_ftrace_event(&call->event); | |
ae63b31e | 1638 | remove_event_from_tracers(call); |
8781915a EG |
1639 | list_del(&call->list); |
1640 | } | |
1641 | ||
1642 | static int event_init(struct ftrace_event_call *call) | |
1643 | { | |
1644 | int ret = 0; | |
de7b2973 | 1645 | const char *name; |
8781915a | 1646 | |
de7b2973 MD |
1647 | name = ftrace_event_name(call); |
1648 | if (WARN_ON(!name)) | |
8781915a EG |
1649 | return -EINVAL; |
1650 | ||
1651 | if (call->class->raw_init) { | |
1652 | ret = call->class->raw_init(call); | |
1653 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 1654 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
1655 | } |
1656 | ||
1657 | return ret; | |
1658 | } | |
1659 | ||
67ead0a6 | 1660 | static int |
ae63b31e | 1661 | __register_event(struct ftrace_event_call *call, struct module *mod) |
bd1a5c84 | 1662 | { |
bd1a5c84 | 1663 | int ret; |
6d723736 | 1664 | |
8781915a EG |
1665 | ret = event_init(call); |
1666 | if (ret < 0) | |
1667 | return ret; | |
701970b3 | 1668 | |
ae63b31e | 1669 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 1670 | call->mod = mod; |
88f70d75 | 1671 | |
ae63b31e | 1672 | return 0; |
bd1a5c84 MH |
1673 | } |
1674 | ||
da511bf3 SRRH |
1675 | static struct ftrace_event_file * |
1676 | trace_create_new_event(struct ftrace_event_call *call, | |
1677 | struct trace_array *tr) | |
1678 | { | |
1679 | struct ftrace_event_file *file; | |
1680 | ||
1681 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
1682 | if (!file) | |
1683 | return NULL; | |
1684 | ||
1685 | file->event_call = call; | |
1686 | file->tr = tr; | |
1687 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
1688 | atomic_set(&file->tm_ref, 0); |
1689 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
1690 | list_add(&file->list, &tr->events); |
1691 | ||
1692 | return file; | |
1693 | } | |
1694 | ||
ae63b31e SR |
1695 | /* Add an event to a trace directory */ |
1696 | static int | |
620a30e9 | 1697 | __trace_add_new_event(struct ftrace_event_call *call, struct trace_array *tr) |
ae63b31e SR |
1698 | { |
1699 | struct ftrace_event_file *file; | |
1700 | ||
da511bf3 | 1701 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
1702 | if (!file) |
1703 | return -ENOMEM; | |
1704 | ||
620a30e9 | 1705 | return event_create_dir(tr->event_dir, file); |
ae63b31e SR |
1706 | } |
1707 | ||
77248221 SR |
1708 | /* |
1709 | * Just create a decriptor for early init. A descriptor is required | |
1710 | * for enabling events at boot. We want to enable events before | |
1711 | * the filesystem is initialized. | |
1712 | */ | |
1713 | static __init int | |
1714 | __trace_early_add_new_event(struct ftrace_event_call *call, | |
1715 | struct trace_array *tr) | |
1716 | { | |
1717 | struct ftrace_event_file *file; | |
1718 | ||
da511bf3 | 1719 | file = trace_create_new_event(call, tr); |
77248221 SR |
1720 | if (!file) |
1721 | return -ENOMEM; | |
1722 | ||
77248221 SR |
1723 | return 0; |
1724 | } | |
1725 | ||
ae63b31e | 1726 | struct ftrace_module_file_ops; |
779c5e37 | 1727 | static void __add_event_to_tracers(struct ftrace_event_call *call); |
ae63b31e | 1728 | |
bd1a5c84 MH |
1729 | /* Add an additional event_call dynamically */ |
1730 | int trace_add_event_call(struct ftrace_event_call *call) | |
1731 | { | |
1732 | int ret; | |
a8227415 | 1733 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 1734 | mutex_lock(&event_mutex); |
701970b3 | 1735 | |
ae63b31e SR |
1736 | ret = __register_event(call, NULL); |
1737 | if (ret >= 0) | |
779c5e37 | 1738 | __add_event_to_tracers(call); |
a2ca5e03 | 1739 | |
ae63b31e | 1740 | mutex_unlock(&event_mutex); |
a8227415 | 1741 | mutex_unlock(&trace_types_lock); |
ae63b31e | 1742 | return ret; |
a2ca5e03 FW |
1743 | } |
1744 | ||
4fead8e4 | 1745 | /* |
a8227415 AL |
1746 | * Must be called under locking of trace_types_lock, event_mutex and |
1747 | * trace_event_sem. | |
4fead8e4 | 1748 | */ |
bd1a5c84 MH |
1749 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1750 | { | |
8781915a | 1751 | event_remove(call); |
bd1a5c84 | 1752 | trace_destroy_fields(call); |
57375747 ON |
1753 | free_event_filter(call->filter); |
1754 | call->filter = NULL; | |
bd1a5c84 MH |
1755 | } |
1756 | ||
2816c551 ON |
1757 | static int probe_remove_event_call(struct ftrace_event_call *call) |
1758 | { | |
1759 | struct trace_array *tr; | |
1760 | struct ftrace_event_file *file; | |
1761 | ||
1762 | #ifdef CONFIG_PERF_EVENTS | |
1763 | if (call->perf_refcount) | |
1764 | return -EBUSY; | |
1765 | #endif | |
1766 | do_for_each_event_file(tr, file) { | |
1767 | if (file->event_call != call) | |
1768 | continue; | |
1769 | /* | |
1770 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
1771 | * we are going to do, FTRACE_EVENT_FL_SOFT_MODE can suppress | |
1772 | * TRACE_REG_UNREGISTER. | |
1773 | */ | |
1774 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
1775 | return -EBUSY; | |
2ba64035 SRRH |
1776 | /* |
1777 | * The do_for_each_event_file_safe() is | |
1778 | * a double loop. After finding the call for this | |
1779 | * trace_array, we use break to jump to the next | |
1780 | * trace_array. | |
1781 | */ | |
2816c551 ON |
1782 | break; |
1783 | } while_for_each_event_file(); | |
1784 | ||
1785 | __trace_remove_event_call(call); | |
1786 | ||
1787 | return 0; | |
1788 | } | |
1789 | ||
bd1a5c84 | 1790 | /* Remove an event_call */ |
2816c551 | 1791 | int trace_remove_event_call(struct ftrace_event_call *call) |
bd1a5c84 | 1792 | { |
2816c551 ON |
1793 | int ret; |
1794 | ||
a8227415 | 1795 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 1796 | mutex_lock(&event_mutex); |
52f6ad6d | 1797 | down_write(&trace_event_sem); |
2816c551 | 1798 | ret = probe_remove_event_call(call); |
52f6ad6d | 1799 | up_write(&trace_event_sem); |
bd1a5c84 | 1800 | mutex_unlock(&event_mutex); |
a8227415 | 1801 | mutex_unlock(&trace_types_lock); |
2816c551 ON |
1802 | |
1803 | return ret; | |
bd1a5c84 MH |
1804 | } |
1805 | ||
1806 | #define for_each_event(event, start, end) \ | |
1807 | for (event = start; \ | |
1808 | (unsigned long)event < (unsigned long)end; \ | |
1809 | event++) | |
1810 | ||
1811 | #ifdef CONFIG_MODULES | |
1812 | ||
6d723736 SR |
1813 | static void trace_module_add_events(struct module *mod) |
1814 | { | |
e4a9ea5e | 1815 | struct ftrace_event_call **call, **start, **end; |
6d723736 | 1816 | |
45ab2813 SRRH |
1817 | if (!mod->num_trace_events) |
1818 | return; | |
1819 | ||
1820 | /* Don't add infrastructure for mods without tracepoints */ | |
1821 | if (trace_module_has_bad_taint(mod)) { | |
1822 | pr_err("%s: module has bad taint, not creating trace events\n", | |
1823 | mod->name); | |
1824 | return; | |
1825 | } | |
1826 | ||
6d723736 SR |
1827 | start = mod->trace_events; |
1828 | end = mod->trace_events + mod->num_trace_events; | |
1829 | ||
6d723736 | 1830 | for_each_event(call, start, end) { |
ae63b31e | 1831 | __register_event(*call, mod); |
779c5e37 | 1832 | __add_event_to_tracers(*call); |
6d723736 SR |
1833 | } |
1834 | } | |
1835 | ||
1836 | static void trace_module_remove_events(struct module *mod) | |
1837 | { | |
1838 | struct ftrace_event_call *call, *p; | |
575380da | 1839 | bool clear_trace = false; |
6d723736 | 1840 | |
52f6ad6d | 1841 | down_write(&trace_event_sem); |
6d723736 SR |
1842 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1843 | if (call->mod == mod) { | |
575380da SRRH |
1844 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
1845 | clear_trace = true; | |
bd1a5c84 | 1846 | __trace_remove_event_call(call); |
6d723736 SR |
1847 | } |
1848 | } | |
52f6ad6d | 1849 | up_write(&trace_event_sem); |
9456f0fa SR |
1850 | |
1851 | /* | |
1852 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
1853 | * registered any events that were used. The only worry is if |
1854 | * a new module gets loaded, and takes on the same id as the events | |
1855 | * of this module. When printing out the buffer, traced events left | |
1856 | * over from this module may be passed to the new module events and | |
1857 | * unexpected results may occur. | |
9456f0fa | 1858 | */ |
575380da | 1859 | if (clear_trace) |
873c642f | 1860 | tracing_reset_all_online_cpus(); |
6d723736 SR |
1861 | } |
1862 | ||
61f919a1 SR |
1863 | static int trace_module_notify(struct notifier_block *self, |
1864 | unsigned long val, void *data) | |
6d723736 SR |
1865 | { |
1866 | struct module *mod = data; | |
1867 | ||
a8227415 | 1868 | mutex_lock(&trace_types_lock); |
6d723736 SR |
1869 | mutex_lock(&event_mutex); |
1870 | switch (val) { | |
1871 | case MODULE_STATE_COMING: | |
1872 | trace_module_add_events(mod); | |
1873 | break; | |
1874 | case MODULE_STATE_GOING: | |
1875 | trace_module_remove_events(mod); | |
1876 | break; | |
1877 | } | |
1878 | mutex_unlock(&event_mutex); | |
a8227415 | 1879 | mutex_unlock(&trace_types_lock); |
fd994989 | 1880 | |
1473e441 SR |
1881 | return 0; |
1882 | } | |
315326c1 | 1883 | |
836d481e ON |
1884 | static struct notifier_block trace_module_nb = { |
1885 | .notifier_call = trace_module_notify, | |
1886 | .priority = 0, | |
1887 | }; | |
61f919a1 | 1888 | #endif /* CONFIG_MODULES */ |
1473e441 | 1889 | |
ae63b31e SR |
1890 | /* Create a new event directory structure for a trace directory. */ |
1891 | static void | |
1892 | __trace_add_event_dirs(struct trace_array *tr) | |
1893 | { | |
ae63b31e SR |
1894 | struct ftrace_event_call *call; |
1895 | int ret; | |
1896 | ||
1897 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 1898 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 1899 | if (ret < 0) |
3448bac3 FF |
1900 | pr_warn("Could not create directory for event %s\n", |
1901 | ftrace_event_name(call)); | |
ae63b31e SR |
1902 | } |
1903 | } | |
1904 | ||
7862ad18 | 1905 | struct ftrace_event_file * |
3cd715de SRRH |
1906 | find_event_file(struct trace_array *tr, const char *system, const char *event) |
1907 | { | |
1908 | struct ftrace_event_file *file; | |
1909 | struct ftrace_event_call *call; | |
de7b2973 | 1910 | const char *name; |
3cd715de SRRH |
1911 | |
1912 | list_for_each_entry(file, &tr->events, list) { | |
1913 | ||
1914 | call = file->event_call; | |
de7b2973 | 1915 | name = ftrace_event_name(call); |
3cd715de | 1916 | |
de7b2973 | 1917 | if (!name || !call->class || !call->class->reg) |
3cd715de SRRH |
1918 | continue; |
1919 | ||
1920 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
1921 | continue; | |
1922 | ||
de7b2973 | 1923 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
1924 | strcmp(system, call->class->system) == 0) |
1925 | return file; | |
1926 | } | |
1927 | return NULL; | |
1928 | } | |
1929 | ||
2875a08b SRRH |
1930 | #ifdef CONFIG_DYNAMIC_FTRACE |
1931 | ||
1932 | /* Avoid typos */ | |
1933 | #define ENABLE_EVENT_STR "enable_event" | |
1934 | #define DISABLE_EVENT_STR "disable_event" | |
1935 | ||
1936 | struct event_probe_data { | |
1937 | struct ftrace_event_file *file; | |
1938 | unsigned long count; | |
1939 | int ref; | |
1940 | bool enable; | |
1941 | }; | |
1942 | ||
3cd715de SRRH |
1943 | static void |
1944 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
1945 | { | |
1946 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
1947 | struct event_probe_data *data = *pdata; | |
1948 | ||
1949 | if (!data) | |
1950 | return; | |
1951 | ||
1952 | if (data->enable) | |
1953 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
1954 | else | |
1955 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
1956 | } | |
1957 | ||
1958 | static void | |
1959 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
1960 | { | |
1961 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
1962 | struct event_probe_data *data = *pdata; | |
1963 | ||
1964 | if (!data) | |
1965 | return; | |
1966 | ||
1967 | if (!data->count) | |
1968 | return; | |
1969 | ||
1970 | /* Skip if the event is in a state we want to switch to */ | |
1971 | if (data->enable == !(data->file->flags & FTRACE_EVENT_FL_SOFT_DISABLED)) | |
1972 | return; | |
1973 | ||
1974 | if (data->count != -1) | |
1975 | (data->count)--; | |
1976 | ||
1977 | event_enable_probe(ip, parent_ip, _data); | |
1978 | } | |
1979 | ||
1980 | static int | |
1981 | event_enable_print(struct seq_file *m, unsigned long ip, | |
1982 | struct ftrace_probe_ops *ops, void *_data) | |
1983 | { | |
1984 | struct event_probe_data *data = _data; | |
1985 | ||
1986 | seq_printf(m, "%ps:", (void *)ip); | |
1987 | ||
1988 | seq_printf(m, "%s:%s:%s", | |
1989 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, | |
1990 | data->file->event_call->class->system, | |
de7b2973 | 1991 | ftrace_event_name(data->file->event_call)); |
3cd715de SRRH |
1992 | |
1993 | if (data->count == -1) | |
fa6f0cc7 | 1994 | seq_puts(m, ":unlimited\n"); |
3cd715de SRRH |
1995 | else |
1996 | seq_printf(m, ":count=%ld\n", data->count); | |
1997 | ||
1998 | return 0; | |
1999 | } | |
2000 | ||
2001 | static int | |
2002 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, | |
2003 | void **_data) | |
2004 | { | |
2005 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2006 | struct event_probe_data *data = *pdata; | |
2007 | ||
2008 | data->ref++; | |
2009 | return 0; | |
2010 | } | |
2011 | ||
2012 | static void | |
2013 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, | |
2014 | void **_data) | |
2015 | { | |
2016 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2017 | struct event_probe_data *data = *pdata; | |
2018 | ||
2019 | if (WARN_ON_ONCE(data->ref <= 0)) | |
2020 | return; | |
2021 | ||
2022 | data->ref--; | |
2023 | if (!data->ref) { | |
2024 | /* Remove the SOFT_MODE flag */ | |
2025 | __ftrace_event_enable_disable(data->file, 0, 1); | |
2026 | module_put(data->file->event_call->mod); | |
2027 | kfree(data); | |
2028 | } | |
2029 | *pdata = NULL; | |
2030 | } | |
2031 | ||
2032 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2033 | .func = event_enable_probe, | |
2034 | .print = event_enable_print, | |
2035 | .init = event_enable_init, | |
2036 | .free = event_enable_free, | |
2037 | }; | |
2038 | ||
2039 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
2040 | .func = event_enable_count_probe, | |
2041 | .print = event_enable_print, | |
2042 | .init = event_enable_init, | |
2043 | .free = event_enable_free, | |
2044 | }; | |
2045 | ||
2046 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
2047 | .func = event_enable_probe, | |
2048 | .print = event_enable_print, | |
2049 | .init = event_enable_init, | |
2050 | .free = event_enable_free, | |
2051 | }; | |
2052 | ||
2053 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2054 | .func = event_enable_count_probe, | |
2055 | .print = event_enable_print, | |
2056 | .init = event_enable_init, | |
2057 | .free = event_enable_free, | |
2058 | }; | |
2059 | ||
2060 | static int | |
2061 | event_enable_func(struct ftrace_hash *hash, | |
2062 | char *glob, char *cmd, char *param, int enabled) | |
2063 | { | |
2064 | struct trace_array *tr = top_trace_array(); | |
2065 | struct ftrace_event_file *file; | |
2066 | struct ftrace_probe_ops *ops; | |
2067 | struct event_probe_data *data; | |
2068 | const char *system; | |
2069 | const char *event; | |
2070 | char *number; | |
2071 | bool enable; | |
2072 | int ret; | |
2073 | ||
dc81e5e3 YY |
2074 | if (!tr) |
2075 | return -ENODEV; | |
2076 | ||
3cd715de | 2077 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 2078 | if (!enabled || !param) |
3cd715de SRRH |
2079 | return -EINVAL; |
2080 | ||
2081 | system = strsep(¶m, ":"); | |
2082 | if (!param) | |
2083 | return -EINVAL; | |
2084 | ||
2085 | event = strsep(¶m, ":"); | |
2086 | ||
2087 | mutex_lock(&event_mutex); | |
2088 | ||
2089 | ret = -EINVAL; | |
2090 | file = find_event_file(tr, system, event); | |
2091 | if (!file) | |
2092 | goto out; | |
2093 | ||
2094 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2095 | ||
2096 | if (enable) | |
2097 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2098 | else | |
2099 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2100 | ||
2101 | if (glob[0] == '!') { | |
2102 | unregister_ftrace_function_probe_func(glob+1, ops); | |
2103 | ret = 0; | |
2104 | goto out; | |
2105 | } | |
2106 | ||
2107 | ret = -ENOMEM; | |
2108 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2109 | if (!data) | |
2110 | goto out; | |
2111 | ||
2112 | data->enable = enable; | |
2113 | data->count = -1; | |
2114 | data->file = file; | |
2115 | ||
2116 | if (!param) | |
2117 | goto out_reg; | |
2118 | ||
2119 | number = strsep(¶m, ":"); | |
2120 | ||
2121 | ret = -EINVAL; | |
2122 | if (!strlen(number)) | |
2123 | goto out_free; | |
2124 | ||
2125 | /* | |
2126 | * We use the callback data field (which is a pointer) | |
2127 | * as our counter. | |
2128 | */ | |
2129 | ret = kstrtoul(number, 0, &data->count); | |
2130 | if (ret) | |
2131 | goto out_free; | |
2132 | ||
2133 | out_reg: | |
2134 | /* Don't let event modules unload while probe registered */ | |
2135 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2136 | if (!ret) { |
2137 | ret = -EBUSY; | |
3cd715de | 2138 | goto out_free; |
6ed01066 | 2139 | } |
3cd715de SRRH |
2140 | |
2141 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2142 | if (ret < 0) | |
2143 | goto out_put; | |
2144 | ret = register_ftrace_function_probe(glob, ops, data); | |
ff305ded SRRH |
2145 | /* |
2146 | * The above returns on success the # of functions enabled, | |
2147 | * but if it didn't find any functions it returns zero. | |
2148 | * Consider no functions a failure too. | |
2149 | */ | |
a5b85bd1 MH |
2150 | if (!ret) { |
2151 | ret = -ENOENT; | |
3cd715de | 2152 | goto out_disable; |
ff305ded SRRH |
2153 | } else if (ret < 0) |
2154 | goto out_disable; | |
2155 | /* Just return zero, not the number of enabled functions */ | |
2156 | ret = 0; | |
3cd715de SRRH |
2157 | out: |
2158 | mutex_unlock(&event_mutex); | |
2159 | return ret; | |
2160 | ||
2161 | out_disable: | |
2162 | __ftrace_event_enable_disable(file, 0, 1); | |
2163 | out_put: | |
2164 | module_put(file->event_call->mod); | |
2165 | out_free: | |
2166 | kfree(data); | |
2167 | goto out; | |
2168 | } | |
2169 | ||
2170 | static struct ftrace_func_command event_enable_cmd = { | |
2171 | .name = ENABLE_EVENT_STR, | |
2172 | .func = event_enable_func, | |
2173 | }; | |
2174 | ||
2175 | static struct ftrace_func_command event_disable_cmd = { | |
2176 | .name = DISABLE_EVENT_STR, | |
2177 | .func = event_enable_func, | |
2178 | }; | |
2179 | ||
2180 | static __init int register_event_cmds(void) | |
2181 | { | |
2182 | int ret; | |
2183 | ||
2184 | ret = register_ftrace_command(&event_enable_cmd); | |
2185 | if (WARN_ON(ret < 0)) | |
2186 | return ret; | |
2187 | ret = register_ftrace_command(&event_disable_cmd); | |
2188 | if (WARN_ON(ret < 0)) | |
2189 | unregister_ftrace_command(&event_enable_cmd); | |
2190 | return ret; | |
2191 | } | |
2192 | #else | |
2193 | static inline int register_event_cmds(void) { return 0; } | |
2194 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2195 | ||
77248221 SR |
2196 | /* |
2197 | * The top level array has already had its ftrace_event_file | |
2198 | * descriptors created in order to allow for early events to | |
2199 | * be recorded. This function is called after the debugfs has been | |
2200 | * initialized, and we now have to create the files associated | |
2201 | * to the events. | |
2202 | */ | |
2203 | static __init void | |
2204 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2205 | { | |
2206 | struct ftrace_event_file *file; | |
2207 | int ret; | |
2208 | ||
2209 | ||
2210 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 2211 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 2212 | if (ret < 0) |
3448bac3 FF |
2213 | pr_warn("Could not create directory for event %s\n", |
2214 | ftrace_event_name(file->event_call)); | |
77248221 SR |
2215 | } |
2216 | } | |
2217 | ||
2218 | /* | |
2219 | * For early boot up, the top trace array requires to have | |
2220 | * a list of events that can be enabled. This must be done before | |
2221 | * the filesystem is set up in order to allow events to be traced | |
2222 | * early. | |
2223 | */ | |
2224 | static __init void | |
2225 | __trace_early_add_events(struct trace_array *tr) | |
2226 | { | |
2227 | struct ftrace_event_call *call; | |
2228 | int ret; | |
2229 | ||
2230 | list_for_each_entry(call, &ftrace_events, list) { | |
2231 | /* Early boot up should not have any modules loaded */ | |
2232 | if (WARN_ON_ONCE(call->mod)) | |
2233 | continue; | |
2234 | ||
2235 | ret = __trace_early_add_new_event(call, tr); | |
2236 | if (ret < 0) | |
3448bac3 FF |
2237 | pr_warn("Could not create early event %s\n", |
2238 | ftrace_event_name(call)); | |
77248221 SR |
2239 | } |
2240 | } | |
2241 | ||
0c8916c3 SR |
2242 | /* Remove the event directory structure for a trace directory. */ |
2243 | static void | |
2244 | __trace_remove_event_dirs(struct trace_array *tr) | |
2245 | { | |
2246 | struct ftrace_event_file *file, *next; | |
2247 | ||
f6a84bdc ON |
2248 | list_for_each_entry_safe(file, next, &tr->events, list) |
2249 | remove_event_file_dir(file); | |
0c8916c3 SR |
2250 | } |
2251 | ||
779c5e37 | 2252 | static void __add_event_to_tracers(struct ftrace_event_call *call) |
ae63b31e SR |
2253 | { |
2254 | struct trace_array *tr; | |
2255 | ||
620a30e9 ON |
2256 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
2257 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
2258 | } |
2259 | ||
e4a9ea5e SR |
2260 | extern struct ftrace_event_call *__start_ftrace_events[]; |
2261 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2262 | |
020e5f85 LZ |
2263 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2264 | ||
2265 | static __init int setup_trace_event(char *str) | |
2266 | { | |
2267 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2268 | ring_buffer_expanded = true; |
2269 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2270 | |
2271 | return 1; | |
2272 | } | |
2273 | __setup("trace_event=", setup_trace_event); | |
2274 | ||
77248221 SR |
2275 | /* Expects to have event_mutex held when called */ |
2276 | static int | |
2277 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2278 | { |
2279 | struct dentry *d_events; | |
2280 | struct dentry *entry; | |
2281 | ||
2282 | entry = debugfs_create_file("set_event", 0644, parent, | |
2283 | tr, &ftrace_set_event_fops); | |
2284 | if (!entry) { | |
3448bac3 | 2285 | pr_warn("Could not create debugfs 'set_event' entry\n"); |
ae63b31e SR |
2286 | return -ENOMEM; |
2287 | } | |
2288 | ||
2289 | d_events = debugfs_create_dir("events", parent); | |
277ba044 | 2290 | if (!d_events) { |
3448bac3 | 2291 | pr_warn("Could not create debugfs 'events' directory\n"); |
277ba044 SR |
2292 | return -ENOMEM; |
2293 | } | |
ae63b31e SR |
2294 | |
2295 | /* ring buffer internal formats */ | |
2296 | trace_create_file("header_page", 0444, d_events, | |
2297 | ring_buffer_print_page_header, | |
2298 | &ftrace_show_header_fops); | |
2299 | ||
2300 | trace_create_file("header_event", 0444, d_events, | |
2301 | ring_buffer_print_entry_header, | |
2302 | &ftrace_show_header_fops); | |
2303 | ||
2304 | trace_create_file("enable", 0644, d_events, | |
2305 | tr, &ftrace_tr_enable_fops); | |
2306 | ||
2307 | tr->event_dir = d_events; | |
77248221 SR |
2308 | |
2309 | return 0; | |
2310 | } | |
2311 | ||
2312 | /** | |
2313 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2314 | * @parent: The parent dentry to place the files/directories for events in | |
2315 | * @tr: The trace array associated with these events | |
2316 | * | |
2317 | * When a new instance is created, it needs to set up its events | |
2318 | * directory, as well as other files associated with events. It also | |
2319 | * creates the event hierachry in the @parent/events directory. | |
2320 | * | |
2321 | * Returns 0 on success. | |
2322 | */ | |
2323 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2324 | { | |
2325 | int ret; | |
2326 | ||
2327 | mutex_lock(&event_mutex); | |
2328 | ||
2329 | ret = create_event_toplevel_files(parent, tr); | |
2330 | if (ret) | |
2331 | goto out_unlock; | |
2332 | ||
52f6ad6d | 2333 | down_write(&trace_event_sem); |
ae63b31e | 2334 | __trace_add_event_dirs(tr); |
52f6ad6d | 2335 | up_write(&trace_event_sem); |
277ba044 | 2336 | |
77248221 | 2337 | out_unlock: |
277ba044 | 2338 | mutex_unlock(&event_mutex); |
ae63b31e | 2339 | |
77248221 SR |
2340 | return ret; |
2341 | } | |
2342 | ||
2343 | /* | |
2344 | * The top trace array already had its file descriptors created. | |
2345 | * Now the files themselves need to be created. | |
2346 | */ | |
2347 | static __init int | |
2348 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2349 | { | |
2350 | int ret; | |
2351 | ||
2352 | mutex_lock(&event_mutex); | |
2353 | ||
2354 | ret = create_event_toplevel_files(parent, tr); | |
2355 | if (ret) | |
2356 | goto out_unlock; | |
2357 | ||
52f6ad6d | 2358 | down_write(&trace_event_sem); |
77248221 | 2359 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 2360 | up_write(&trace_event_sem); |
77248221 SR |
2361 | |
2362 | out_unlock: | |
2363 | mutex_unlock(&event_mutex); | |
2364 | ||
2365 | return ret; | |
ae63b31e SR |
2366 | } |
2367 | ||
0c8916c3 SR |
2368 | int event_trace_del_tracer(struct trace_array *tr) |
2369 | { | |
0c8916c3 SR |
2370 | mutex_lock(&event_mutex); |
2371 | ||
85f2b082 TZ |
2372 | /* Disable any event triggers and associated soft-disabled events */ |
2373 | clear_event_triggers(tr); | |
2374 | ||
2a6c24af SRRH |
2375 | /* Disable any running events */ |
2376 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
2377 | ||
3ccb0123 SR |
2378 | /* Access to events are within rcu_read_lock_sched() */ |
2379 | synchronize_sched(); | |
2380 | ||
52f6ad6d | 2381 | down_write(&trace_event_sem); |
0c8916c3 SR |
2382 | __trace_remove_event_dirs(tr); |
2383 | debugfs_remove_recursive(tr->event_dir); | |
52f6ad6d | 2384 | up_write(&trace_event_sem); |
0c8916c3 SR |
2385 | |
2386 | tr->event_dir = NULL; | |
2387 | ||
2388 | mutex_unlock(&event_mutex); | |
2389 | ||
2390 | return 0; | |
2391 | } | |
2392 | ||
d1a29143 SR |
2393 | static __init int event_trace_memsetup(void) |
2394 | { | |
2395 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
2396 | file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC); | |
2397 | return 0; | |
2398 | } | |
2399 | ||
8781915a EG |
2400 | static __init int event_trace_enable(void) |
2401 | { | |
ae63b31e | 2402 | struct trace_array *tr = top_trace_array(); |
8781915a EG |
2403 | struct ftrace_event_call **iter, *call; |
2404 | char *buf = bootup_event_buf; | |
2405 | char *token; | |
2406 | int ret; | |
2407 | ||
dc81e5e3 YY |
2408 | if (!tr) |
2409 | return -ENODEV; | |
2410 | ||
8781915a EG |
2411 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
2412 | ||
2413 | call = *iter; | |
2414 | ret = event_init(call); | |
2415 | if (!ret) | |
2416 | list_add(&call->list, &ftrace_events); | |
2417 | } | |
2418 | ||
77248221 SR |
2419 | /* |
2420 | * We need the top trace array to have a working set of trace | |
2421 | * points at early init, before the debug files and directories | |
2422 | * are created. Create the file entries now, and attach them | |
2423 | * to the actual file dentries later. | |
2424 | */ | |
2425 | __trace_early_add_events(tr); | |
2426 | ||
8781915a EG |
2427 | while (true) { |
2428 | token = strsep(&buf, ","); | |
2429 | ||
2430 | if (!token) | |
2431 | break; | |
2432 | if (!*token) | |
2433 | continue; | |
2434 | ||
ae63b31e | 2435 | ret = ftrace_set_clr_event(tr, token, 1); |
8781915a EG |
2436 | if (ret) |
2437 | pr_warn("Failed to enable trace event: %s\n", token); | |
2438 | } | |
81698831 SR |
2439 | |
2440 | trace_printk_start_comm(); | |
2441 | ||
3cd715de SRRH |
2442 | register_event_cmds(); |
2443 | ||
85f2b082 TZ |
2444 | register_trigger_cmds(); |
2445 | ||
8781915a EG |
2446 | return 0; |
2447 | } | |
2448 | ||
b77e38aa SR |
2449 | static __init int event_trace_init(void) |
2450 | { | |
ae63b31e | 2451 | struct trace_array *tr; |
b77e38aa SR |
2452 | struct dentry *d_tracer; |
2453 | struct dentry *entry; | |
6d723736 | 2454 | int ret; |
b77e38aa | 2455 | |
ae63b31e | 2456 | tr = top_trace_array(); |
dc81e5e3 YY |
2457 | if (!tr) |
2458 | return -ENODEV; | |
ae63b31e | 2459 | |
b77e38aa SR |
2460 | d_tracer = tracing_init_dentry(); |
2461 | if (!d_tracer) | |
2462 | return 0; | |
2463 | ||
2314c4ae | 2464 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 2465 | tr, &ftrace_avail_fops); |
2314c4ae | 2466 | if (!entry) |
3448bac3 | 2467 | pr_warn("Could not create debugfs 'available_events' entry\n"); |
2314c4ae | 2468 | |
8728fe50 | 2469 | if (trace_define_common_fields()) |
3448bac3 | 2470 | pr_warn("tracing: Failed to allocate common fields"); |
8728fe50 | 2471 | |
77248221 | 2472 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
2473 | if (ret) |
2474 | return ret; | |
020e5f85 | 2475 | |
836d481e | 2476 | #ifdef CONFIG_MODULES |
6d723736 | 2477 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 2478 | if (ret) |
3448bac3 | 2479 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 2480 | #endif |
b77e38aa SR |
2481 | return 0; |
2482 | } | |
d1a29143 | 2483 | early_initcall(event_trace_memsetup); |
8781915a | 2484 | core_initcall(event_trace_enable); |
b77e38aa | 2485 | fs_initcall(event_trace_init); |
e6187007 SR |
2486 | |
2487 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
2488 | ||
2489 | static DEFINE_SPINLOCK(test_spinlock); | |
2490 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
2491 | static DEFINE_MUTEX(test_mutex); | |
2492 | ||
2493 | static __init void test_work(struct work_struct *dummy) | |
2494 | { | |
2495 | spin_lock(&test_spinlock); | |
2496 | spin_lock_irq(&test_spinlock_irq); | |
2497 | udelay(1); | |
2498 | spin_unlock_irq(&test_spinlock_irq); | |
2499 | spin_unlock(&test_spinlock); | |
2500 | ||
2501 | mutex_lock(&test_mutex); | |
2502 | msleep(1); | |
2503 | mutex_unlock(&test_mutex); | |
2504 | } | |
2505 | ||
2506 | static __init int event_test_thread(void *unused) | |
2507 | { | |
2508 | void *test_malloc; | |
2509 | ||
2510 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
2511 | if (!test_malloc) | |
2512 | pr_info("failed to kmalloc\n"); | |
2513 | ||
2514 | schedule_on_each_cpu(test_work); | |
2515 | ||
2516 | kfree(test_malloc); | |
2517 | ||
2518 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 2519 | while (!kthread_should_stop()) { |
e6187007 | 2520 | schedule(); |
fe0e01c7 PZ |
2521 | set_current_state(TASK_INTERRUPTIBLE); |
2522 | } | |
2523 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
2524 | |
2525 | return 0; | |
2526 | } | |
2527 | ||
2528 | /* | |
2529 | * Do various things that may trigger events. | |
2530 | */ | |
2531 | static __init void event_test_stuff(void) | |
2532 | { | |
2533 | struct task_struct *test_thread; | |
2534 | ||
2535 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
2536 | msleep(1); | |
2537 | kthread_stop(test_thread); | |
2538 | } | |
2539 | ||
2540 | /* | |
2541 | * For every trace event defined, we will test each trace point separately, | |
2542 | * and then by groups, and finally all trace points. | |
2543 | */ | |
9ea21c1e | 2544 | static __init void event_trace_self_tests(void) |
e6187007 | 2545 | { |
ae63b31e SR |
2546 | struct ftrace_subsystem_dir *dir; |
2547 | struct ftrace_event_file *file; | |
e6187007 SR |
2548 | struct ftrace_event_call *call; |
2549 | struct event_subsystem *system; | |
ae63b31e | 2550 | struct trace_array *tr; |
e6187007 SR |
2551 | int ret; |
2552 | ||
ae63b31e | 2553 | tr = top_trace_array(); |
dc81e5e3 YY |
2554 | if (!tr) |
2555 | return; | |
ae63b31e | 2556 | |
e6187007 SR |
2557 | pr_info("Running tests on trace events:\n"); |
2558 | ||
ae63b31e SR |
2559 | list_for_each_entry(file, &tr->events, list) { |
2560 | ||
2561 | call = file->event_call; | |
e6187007 | 2562 | |
2239291a SR |
2563 | /* Only test those that have a probe */ |
2564 | if (!call->class || !call->class->probe) | |
e6187007 SR |
2565 | continue; |
2566 | ||
1f5a6b45 SR |
2567 | /* |
2568 | * Testing syscall events here is pretty useless, but | |
2569 | * we still do it if configured. But this is time consuming. | |
2570 | * What we really need is a user thread to perform the | |
2571 | * syscalls as we test. | |
2572 | */ | |
2573 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
2574 | if (call->class->system && |
2575 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
2576 | continue; |
2577 | #endif | |
2578 | ||
de7b2973 | 2579 | pr_info("Testing event %s: ", ftrace_event_name(call)); |
e6187007 SR |
2580 | |
2581 | /* | |
2582 | * If an event is already enabled, someone is using | |
2583 | * it and the self test should not be on. | |
2584 | */ | |
ae63b31e | 2585 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
3448bac3 | 2586 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
2587 | WARN_ON_ONCE(1); |
2588 | continue; | |
2589 | } | |
2590 | ||
ae63b31e | 2591 | ftrace_event_enable_disable(file, 1); |
e6187007 | 2592 | event_test_stuff(); |
ae63b31e | 2593 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
2594 | |
2595 | pr_cont("OK\n"); | |
2596 | } | |
2597 | ||
2598 | /* Now test at the sub system level */ | |
2599 | ||
2600 | pr_info("Running tests on trace event systems:\n"); | |
2601 | ||
ae63b31e SR |
2602 | list_for_each_entry(dir, &tr->systems, list) { |
2603 | ||
2604 | system = dir->subsystem; | |
e6187007 SR |
2605 | |
2606 | /* the ftrace system is special, skip it */ | |
2607 | if (strcmp(system->name, "ftrace") == 0) | |
2608 | continue; | |
2609 | ||
2610 | pr_info("Testing event system %s: ", system->name); | |
2611 | ||
ae63b31e | 2612 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 2613 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
2614 | pr_warn("error enabling system %s\n", |
2615 | system->name); | |
e6187007 SR |
2616 | continue; |
2617 | } | |
2618 | ||
2619 | event_test_stuff(); | |
2620 | ||
ae63b31e | 2621 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 2622 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
2623 | pr_warn("error disabling system %s\n", |
2624 | system->name); | |
76bab1b7 YL |
2625 | continue; |
2626 | } | |
e6187007 SR |
2627 | |
2628 | pr_cont("OK\n"); | |
2629 | } | |
2630 | ||
2631 | /* Test with all events enabled */ | |
2632 | ||
2633 | pr_info("Running tests on all trace events:\n"); | |
2634 | pr_info("Testing all events: "); | |
2635 | ||
ae63b31e | 2636 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 2637 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 2638 | pr_warn("error enabling all events\n"); |
9ea21c1e | 2639 | return; |
e6187007 SR |
2640 | } |
2641 | ||
2642 | event_test_stuff(); | |
2643 | ||
2644 | /* reset sysname */ | |
ae63b31e | 2645 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 2646 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 2647 | pr_warn("error disabling all events\n"); |
9ea21c1e | 2648 | return; |
e6187007 SR |
2649 | } |
2650 | ||
2651 | pr_cont("OK\n"); | |
9ea21c1e SR |
2652 | } |
2653 | ||
2654 | #ifdef CONFIG_FUNCTION_TRACER | |
2655 | ||
245b2e70 | 2656 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
2657 | |
2658 | static void | |
2f5f6ad9 | 2659 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 2660 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
2661 | { |
2662 | struct ring_buffer_event *event; | |
e77405ad | 2663 | struct ring_buffer *buffer; |
9ea21c1e SR |
2664 | struct ftrace_entry *entry; |
2665 | unsigned long flags; | |
2666 | long disabled; | |
9ea21c1e SR |
2667 | int cpu; |
2668 | int pc; | |
2669 | ||
2670 | pc = preempt_count(); | |
5168ae50 | 2671 | preempt_disable_notrace(); |
9ea21c1e | 2672 | cpu = raw_smp_processor_id(); |
245b2e70 | 2673 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
2674 | |
2675 | if (disabled != 1) | |
2676 | goto out; | |
2677 | ||
2678 | local_save_flags(flags); | |
2679 | ||
e77405ad SR |
2680 | event = trace_current_buffer_lock_reserve(&buffer, |
2681 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
2682 | flags, pc); |
2683 | if (!event) | |
2684 | goto out; | |
2685 | entry = ring_buffer_event_data(event); | |
2686 | entry->ip = ip; | |
2687 | entry->parent_ip = parent_ip; | |
2688 | ||
0d5c6e1c | 2689 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
2690 | |
2691 | out: | |
245b2e70 | 2692 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 2693 | preempt_enable_notrace(); |
9ea21c1e SR |
2694 | } |
2695 | ||
2696 | static struct ftrace_ops trace_ops __initdata = | |
2697 | { | |
2698 | .func = function_test_events_call, | |
4740974a | 2699 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
2700 | }; |
2701 | ||
2702 | static __init void event_trace_self_test_with_function(void) | |
2703 | { | |
17bb615a SR |
2704 | int ret; |
2705 | ret = register_ftrace_function(&trace_ops); | |
2706 | if (WARN_ON(ret < 0)) { | |
2707 | pr_info("Failed to enable function tracer for event tests\n"); | |
2708 | return; | |
2709 | } | |
9ea21c1e SR |
2710 | pr_info("Running tests again, along with the function tracer\n"); |
2711 | event_trace_self_tests(); | |
2712 | unregister_ftrace_function(&trace_ops); | |
2713 | } | |
2714 | #else | |
2715 | static __init void event_trace_self_test_with_function(void) | |
2716 | { | |
2717 | } | |
2718 | #endif | |
2719 | ||
2720 | static __init int event_trace_self_tests_init(void) | |
2721 | { | |
020e5f85 LZ |
2722 | if (!tracing_selftest_disabled) { |
2723 | event_trace_self_tests(); | |
2724 | event_trace_self_test_with_function(); | |
2725 | } | |
e6187007 SR |
2726 | |
2727 | return 0; | |
2728 | } | |
2729 | ||
28d20e2d | 2730 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
2731 | |
2732 | #endif |