Commit | Line | Data |
---|---|---|
b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
e6187007 SR |
11 | #include <linux/workqueue.h> |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/kthread.h> | |
b77e38aa SR |
14 | #include <linux/debugfs.h> |
15 | #include <linux/uaccess.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/ctype.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
e6187007 | 19 | #include <linux/delay.h> |
b77e38aa | 20 | |
020e5f85 LZ |
21 | #include <asm/setup.h> |
22 | ||
91729ef9 | 23 | #include "trace_output.h" |
b77e38aa | 24 | |
4e5292ea | 25 | #undef TRACE_SYSTEM |
b628b3e6 SR |
26 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
27 | ||
20c8928a | 28 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 29 | |
a59fd602 | 30 | LIST_HEAD(ftrace_events); |
b3a8c6fd | 31 | static LIST_HEAD(ftrace_common_fields); |
a59fd602 | 32 | |
d1a29143 SR |
33 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
34 | ||
35 | static struct kmem_cache *field_cachep; | |
36 | static struct kmem_cache *file_cachep; | |
37 | ||
e6929efa SR |
38 | #define SYSTEM_FL_FREE_NAME (1 << 31) |
39 | ||
40 | static inline int system_refcount(struct event_subsystem *system) | |
41 | { | |
42 | return system->ref_count & ~SYSTEM_FL_FREE_NAME; | |
43 | } | |
44 | ||
45 | static int system_refcount_inc(struct event_subsystem *system) | |
46 | { | |
47 | return (system->ref_count++) & ~SYSTEM_FL_FREE_NAME; | |
48 | } | |
49 | ||
50 | static int system_refcount_dec(struct event_subsystem *system) | |
51 | { | |
52 | return (--system->ref_count) & ~SYSTEM_FL_FREE_NAME; | |
53 | } | |
54 | ||
ae63b31e SR |
55 | /* Double loops, do not use break, only goto's work */ |
56 | #define do_for_each_event_file(tr, file) \ | |
57 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
58 | list_for_each_entry(file, &tr->events, list) | |
59 | ||
60 | #define do_for_each_event_file_safe(tr, file) \ | |
61 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
62 | struct ftrace_event_file *___n; \ | |
63 | list_for_each_entry_safe(file, ___n, &tr->events, list) | |
64 | ||
65 | #define while_for_each_event_file() \ | |
66 | } | |
67 | ||
b3a8c6fd | 68 | static struct list_head * |
2e33af02 SR |
69 | trace_get_fields(struct ftrace_event_call *event_call) |
70 | { | |
71 | if (!event_call->class->get_fields) | |
72 | return &event_call->class->fields; | |
73 | return event_call->class->get_fields(event_call); | |
74 | } | |
75 | ||
b3a8c6fd J |
76 | static struct ftrace_event_field * |
77 | __find_event_field(struct list_head *head, char *name) | |
78 | { | |
79 | struct ftrace_event_field *field; | |
80 | ||
81 | list_for_each_entry(field, head, link) { | |
82 | if (!strcmp(field->name, name)) | |
83 | return field; | |
84 | } | |
85 | ||
86 | return NULL; | |
87 | } | |
88 | ||
89 | struct ftrace_event_field * | |
90 | trace_find_event_field(struct ftrace_event_call *call, char *name) | |
91 | { | |
92 | struct ftrace_event_field *field; | |
93 | struct list_head *head; | |
94 | ||
95 | field = __find_event_field(&ftrace_common_fields, name); | |
96 | if (field) | |
97 | return field; | |
98 | ||
99 | head = trace_get_fields(call); | |
100 | return __find_event_field(head, name); | |
101 | } | |
102 | ||
8728fe50 LZ |
103 | static int __trace_define_field(struct list_head *head, const char *type, |
104 | const char *name, int offset, int size, | |
105 | int is_signed, int filter_type) | |
cf027f64 TZ |
106 | { |
107 | struct ftrace_event_field *field; | |
108 | ||
d1a29143 | 109 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 110 | if (!field) |
b0cfaffa | 111 | return -ENOMEM; |
fe9f57f2 | 112 | |
92edca07 SR |
113 | field->name = name; |
114 | field->type = type; | |
fe9f57f2 | 115 | |
43b51ead LZ |
116 | if (filter_type == FILTER_OTHER) |
117 | field->filter_type = filter_assign_type(type); | |
118 | else | |
119 | field->filter_type = filter_type; | |
120 | ||
cf027f64 TZ |
121 | field->offset = offset; |
122 | field->size = size; | |
a118e4d1 | 123 | field->is_signed = is_signed; |
aa38e9fc | 124 | |
2e33af02 | 125 | list_add(&field->link, head); |
cf027f64 TZ |
126 | |
127 | return 0; | |
cf027f64 | 128 | } |
8728fe50 LZ |
129 | |
130 | int trace_define_field(struct ftrace_event_call *call, const char *type, | |
131 | const char *name, int offset, int size, int is_signed, | |
132 | int filter_type) | |
133 | { | |
134 | struct list_head *head; | |
135 | ||
136 | if (WARN_ON(!call->class)) | |
137 | return 0; | |
138 | ||
139 | head = trace_get_fields(call); | |
140 | return __trace_define_field(head, type, name, offset, size, | |
141 | is_signed, filter_type); | |
142 | } | |
17c873ec | 143 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 144 | |
e647d6b3 | 145 | #define __common_field(type, item) \ |
8728fe50 LZ |
146 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
147 | "common_" #item, \ | |
148 | offsetof(typeof(ent), item), \ | |
149 | sizeof(ent.item), \ | |
150 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
151 | if (ret) \ |
152 | return ret; | |
153 | ||
8728fe50 | 154 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
155 | { |
156 | int ret; | |
157 | struct trace_entry ent; | |
158 | ||
159 | __common_field(unsigned short, type); | |
160 | __common_field(unsigned char, flags); | |
161 | __common_field(unsigned char, preempt_count); | |
162 | __common_field(int, pid); | |
e647d6b3 LZ |
163 | |
164 | return ret; | |
165 | } | |
166 | ||
ad7067ce | 167 | static void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
168 | { |
169 | struct ftrace_event_field *field, *next; | |
2e33af02 | 170 | struct list_head *head; |
2df75e41 | 171 | |
2e33af02 SR |
172 | head = trace_get_fields(call); |
173 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 174 | list_del(&field->link); |
d1a29143 | 175 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
176 | } |
177 | } | |
178 | ||
87d9b4e1 LZ |
179 | int trace_event_raw_init(struct ftrace_event_call *call) |
180 | { | |
181 | int id; | |
182 | ||
80decc70 | 183 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
184 | if (!id) |
185 | return -ENODEV; | |
87d9b4e1 LZ |
186 | |
187 | return 0; | |
188 | } | |
189 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
190 | ||
ceec0b6f JO |
191 | int ftrace_event_reg(struct ftrace_event_call *call, |
192 | enum trace_reg type, void *data) | |
a1d0ce82 | 193 | { |
ae63b31e SR |
194 | struct ftrace_event_file *file = data; |
195 | ||
a1d0ce82 SR |
196 | switch (type) { |
197 | case TRACE_REG_REGISTER: | |
198 | return tracepoint_probe_register(call->name, | |
199 | call->class->probe, | |
ae63b31e | 200 | file); |
a1d0ce82 SR |
201 | case TRACE_REG_UNREGISTER: |
202 | tracepoint_probe_unregister(call->name, | |
203 | call->class->probe, | |
ae63b31e | 204 | file); |
a1d0ce82 SR |
205 | return 0; |
206 | ||
207 | #ifdef CONFIG_PERF_EVENTS | |
208 | case TRACE_REG_PERF_REGISTER: | |
209 | return tracepoint_probe_register(call->name, | |
210 | call->class->perf_probe, | |
211 | call); | |
212 | case TRACE_REG_PERF_UNREGISTER: | |
213 | tracepoint_probe_unregister(call->name, | |
214 | call->class->perf_probe, | |
215 | call); | |
216 | return 0; | |
ceec0b6f JO |
217 | case TRACE_REG_PERF_OPEN: |
218 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
219 | case TRACE_REG_PERF_ADD: |
220 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 221 | return 0; |
a1d0ce82 SR |
222 | #endif |
223 | } | |
224 | return 0; | |
225 | } | |
226 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
227 | ||
e870e9a1 LZ |
228 | void trace_event_enable_cmd_record(bool enable) |
229 | { | |
ae63b31e SR |
230 | struct ftrace_event_file *file; |
231 | struct trace_array *tr; | |
e870e9a1 LZ |
232 | |
233 | mutex_lock(&event_mutex); | |
ae63b31e SR |
234 | do_for_each_event_file(tr, file) { |
235 | ||
236 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) | |
e870e9a1 LZ |
237 | continue; |
238 | ||
239 | if (enable) { | |
240 | tracing_start_cmdline_record(); | |
417944c4 | 241 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
242 | } else { |
243 | tracing_stop_cmdline_record(); | |
417944c4 | 244 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 245 | } |
ae63b31e | 246 | } while_for_each_event_file(); |
e870e9a1 LZ |
247 | mutex_unlock(&event_mutex); |
248 | } | |
249 | ||
417944c4 SRRH |
250 | static int __ftrace_event_enable_disable(struct ftrace_event_file *file, |
251 | int enable, int soft_disable) | |
fd994989 | 252 | { |
ae63b31e | 253 | struct ftrace_event_call *call = file->event_call; |
3b8e4273 | 254 | int ret = 0; |
417944c4 | 255 | int disable; |
3b8e4273 | 256 | |
fd994989 SR |
257 | switch (enable) { |
258 | case 0: | |
417944c4 | 259 | /* |
1cf4c073 MH |
260 | * When soft_disable is set and enable is cleared, the sm_ref |
261 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
262 | * to clear the SOFT_DISABLED flag but leave the event in the |
263 | * state that it was. That is, if the event was enabled and | |
264 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
265 | * is set we do not want the event to be enabled before we | |
266 | * clear the bit. | |
267 | * | |
268 | * When soft_disable is not set but the SOFT_MODE flag is, | |
269 | * we do nothing. Do not disable the tracepoint, otherwise | |
270 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
271 | */ | |
272 | if (soft_disable) { | |
1cf4c073 MH |
273 | if (atomic_dec_return(&file->sm_ref) > 0) |
274 | break; | |
417944c4 SRRH |
275 | disable = file->flags & FTRACE_EVENT_FL_SOFT_DISABLED; |
276 | clear_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); | |
277 | } else | |
278 | disable = !(file->flags & FTRACE_EVENT_FL_SOFT_MODE); | |
279 | ||
280 | if (disable && (file->flags & FTRACE_EVENT_FL_ENABLED)) { | |
281 | clear_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); | |
ae63b31e | 282 | if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) { |
e870e9a1 | 283 | tracing_stop_cmdline_record(); |
417944c4 | 284 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 285 | } |
ae63b31e | 286 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 287 | } |
417944c4 SRRH |
288 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT */ |
289 | if (file->flags & FTRACE_EVENT_FL_SOFT_MODE) | |
290 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
fd994989 SR |
291 | break; |
292 | case 1: | |
417944c4 SRRH |
293 | /* |
294 | * When soft_disable is set and enable is set, we want to | |
295 | * register the tracepoint for the event, but leave the event | |
296 | * as is. That means, if the event was already enabled, we do | |
297 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
298 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
299 | * it still seems to be disabled. | |
300 | */ | |
301 | if (!soft_disable) | |
302 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
1cf4c073 MH |
303 | else { |
304 | if (atomic_inc_return(&file->sm_ref) > 1) | |
305 | break; | |
417944c4 | 306 | set_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 307 | } |
417944c4 | 308 | |
ae63b31e | 309 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) { |
417944c4 SRRH |
310 | |
311 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
312 | if (soft_disable) | |
313 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
314 | ||
e870e9a1 LZ |
315 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
316 | tracing_start_cmdline_record(); | |
417944c4 | 317 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 318 | } |
ae63b31e | 319 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
320 | if (ret) { |
321 | tracing_stop_cmdline_record(); | |
322 | pr_info("event trace: Could not enable event " | |
323 | "%s\n", call->name); | |
324 | break; | |
325 | } | |
417944c4 | 326 | set_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
327 | |
328 | /* WAS_ENABLED gets set but never cleared. */ | |
329 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; | |
fd994989 | 330 | } |
fd994989 SR |
331 | break; |
332 | } | |
3b8e4273 LZ |
333 | |
334 | return ret; | |
fd994989 SR |
335 | } |
336 | ||
417944c4 SRRH |
337 | static int ftrace_event_enable_disable(struct ftrace_event_file *file, |
338 | int enable) | |
339 | { | |
340 | return __ftrace_event_enable_disable(file, enable, 0); | |
341 | } | |
342 | ||
ae63b31e | 343 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 344 | { |
ae63b31e | 345 | struct ftrace_event_file *file; |
0e907c99 Z |
346 | |
347 | mutex_lock(&event_mutex); | |
ae63b31e SR |
348 | list_for_each_entry(file, &tr->events, list) { |
349 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
350 | } |
351 | mutex_unlock(&event_mutex); | |
352 | } | |
353 | ||
e9dbfae5 SR |
354 | static void __put_system(struct event_subsystem *system) |
355 | { | |
356 | struct event_filter *filter = system->filter; | |
357 | ||
e6929efa SR |
358 | WARN_ON_ONCE(system_refcount(system) == 0); |
359 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
360 | return; |
361 | ||
ae63b31e SR |
362 | list_del(&system->list); |
363 | ||
e9dbfae5 SR |
364 | if (filter) { |
365 | kfree(filter->filter_string); | |
366 | kfree(filter); | |
367 | } | |
e6929efa SR |
368 | if (system->ref_count & SYSTEM_FL_FREE_NAME) |
369 | kfree(system->name); | |
e9dbfae5 SR |
370 | kfree(system); |
371 | } | |
372 | ||
373 | static void __get_system(struct event_subsystem *system) | |
374 | { | |
e6929efa SR |
375 | WARN_ON_ONCE(system_refcount(system) == 0); |
376 | system_refcount_inc(system); | |
e9dbfae5 SR |
377 | } |
378 | ||
ae63b31e SR |
379 | static void __get_system_dir(struct ftrace_subsystem_dir *dir) |
380 | { | |
381 | WARN_ON_ONCE(dir->ref_count == 0); | |
382 | dir->ref_count++; | |
383 | __get_system(dir->subsystem); | |
384 | } | |
385 | ||
386 | static void __put_system_dir(struct ftrace_subsystem_dir *dir) | |
387 | { | |
388 | WARN_ON_ONCE(dir->ref_count == 0); | |
389 | /* If the subsystem is about to be freed, the dir must be too */ | |
e6929efa | 390 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
391 | |
392 | __put_system(dir->subsystem); | |
393 | if (!--dir->ref_count) | |
394 | kfree(dir); | |
395 | } | |
396 | ||
397 | static void put_system(struct ftrace_subsystem_dir *dir) | |
e9dbfae5 SR |
398 | { |
399 | mutex_lock(&event_mutex); | |
ae63b31e | 400 | __put_system_dir(dir); |
e9dbfae5 SR |
401 | mutex_unlock(&event_mutex); |
402 | } | |
403 | ||
c6febdf2 ON |
404 | static void remove_subsystem(struct ftrace_subsystem_dir *dir) |
405 | { | |
406 | if (!dir) | |
407 | return; | |
408 | ||
409 | if (!--dir->nr_events) { | |
410 | debugfs_remove_recursive(dir->entry); | |
411 | list_del(&dir->list); | |
412 | __put_system_dir(dir); | |
413 | } | |
414 | } | |
415 | ||
fdb65fe2 ON |
416 | static void *event_file_data(struct file *filp) |
417 | { | |
418 | return ACCESS_ONCE(file_inode(filp)->i_private); | |
419 | } | |
420 | ||
c6febdf2 ON |
421 | static void remove_event_file_dir(struct ftrace_event_file *file) |
422 | { | |
012dc156 ON |
423 | struct dentry *dir = file->dir; |
424 | struct dentry *child; | |
425 | ||
426 | if (dir) { | |
427 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
6637ecd3 | 428 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
012dc156 ON |
429 | if (child->d_inode) /* probably unneeded */ |
430 | child->d_inode->i_private = NULL; | |
431 | } | |
432 | spin_unlock(&dir->d_lock); | |
433 | ||
434 | debugfs_remove_recursive(dir); | |
435 | } | |
436 | ||
c6febdf2 | 437 | list_del(&file->list); |
c6febdf2 ON |
438 | remove_subsystem(file->system); |
439 | kmem_cache_free(file_cachep, file); | |
440 | } | |
441 | ||
8f31bfe5 LZ |
442 | /* |
443 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
444 | */ | |
68cebd26 SRRH |
445 | static int |
446 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
447 | const char *sub, const char *event, int set) | |
b77e38aa | 448 | { |
ae63b31e | 449 | struct ftrace_event_file *file; |
a59fd602 | 450 | struct ftrace_event_call *call; |
29f93943 | 451 | int ret = -EINVAL; |
8f31bfe5 | 452 | |
ae63b31e SR |
453 | list_for_each_entry(file, &tr->events, list) { |
454 | ||
455 | call = file->event_call; | |
8f31bfe5 | 456 | |
a1d0ce82 | 457 | if (!call->name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
458 | continue; |
459 | ||
9b63776f SR |
460 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
461 | continue; | |
462 | ||
8f31bfe5 LZ |
463 | if (match && |
464 | strcmp(match, call->name) != 0 && | |
8f082018 | 465 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
466 | continue; |
467 | ||
8f082018 | 468 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
469 | continue; |
470 | ||
471 | if (event && strcmp(event, call->name) != 0) | |
472 | continue; | |
473 | ||
ae63b31e | 474 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
475 | |
476 | ret = 0; | |
477 | } | |
68cebd26 SRRH |
478 | |
479 | return ret; | |
480 | } | |
481 | ||
482 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
483 | const char *sub, const char *event, int set) | |
484 | { | |
485 | int ret; | |
486 | ||
487 | mutex_lock(&event_mutex); | |
488 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
489 | mutex_unlock(&event_mutex); |
490 | ||
491 | return ret; | |
492 | } | |
493 | ||
ae63b31e | 494 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 495 | { |
b628b3e6 | 496 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
497 | |
498 | /* | |
499 | * The buf format can be <subsystem>:<event-name> | |
500 | * *:<event-name> means any event by that name. | |
501 | * :<event-name> is the same. | |
502 | * | |
503 | * <subsystem>:* means all events in that subsystem | |
504 | * <subsystem>: means the same. | |
505 | * | |
506 | * <name> (no ':') means all events in a subsystem with | |
507 | * the name <name> or any event that matches <name> | |
508 | */ | |
509 | ||
510 | match = strsep(&buf, ":"); | |
511 | if (buf) { | |
512 | sub = match; | |
513 | event = buf; | |
514 | match = NULL; | |
515 | ||
516 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
517 | sub = NULL; | |
518 | if (!strlen(event) || strcmp(event, "*") == 0) | |
519 | event = NULL; | |
520 | } | |
b77e38aa | 521 | |
ae63b31e | 522 | return __ftrace_set_clr_event(tr, match, sub, event, set); |
b77e38aa SR |
523 | } |
524 | ||
4671c794 SR |
525 | /** |
526 | * trace_set_clr_event - enable or disable an event | |
527 | * @system: system name to match (NULL for any system) | |
528 | * @event: event name to match (NULL for all events, within system) | |
529 | * @set: 1 to enable, 0 to disable | |
530 | * | |
531 | * This is a way for other parts of the kernel to enable or disable | |
532 | * event recording. | |
533 | * | |
534 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
535 | * registered events. | |
536 | */ | |
537 | int trace_set_clr_event(const char *system, const char *event, int set) | |
538 | { | |
ae63b31e SR |
539 | struct trace_array *tr = top_trace_array(); |
540 | ||
541 | return __ftrace_set_clr_event(tr, NULL, system, event, set); | |
4671c794 | 542 | } |
56355b83 | 543 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 544 | |
b77e38aa SR |
545 | /* 128 should be much more than enough */ |
546 | #define EVENT_BUF_SIZE 127 | |
547 | ||
548 | static ssize_t | |
549 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
550 | size_t cnt, loff_t *ppos) | |
551 | { | |
48966364 | 552 | struct trace_parser parser; |
ae63b31e SR |
553 | struct seq_file *m = file->private_data; |
554 | struct trace_array *tr = m->private; | |
4ba7978e | 555 | ssize_t read, ret; |
b77e38aa | 556 | |
4ba7978e | 557 | if (!cnt) |
b77e38aa SR |
558 | return 0; |
559 | ||
1852fcce SR |
560 | ret = tracing_update_buffers(); |
561 | if (ret < 0) | |
562 | return ret; | |
563 | ||
48966364 | 564 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
565 | return -ENOMEM; |
566 | ||
48966364 | 567 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
568 | ||
4ba7978e | 569 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 570 | int set = 1; |
b77e38aa | 571 | |
48966364 | 572 | if (*parser.buffer == '!') |
b77e38aa | 573 | set = 0; |
b77e38aa | 574 | |
48966364 | 575 | parser.buffer[parser.idx] = 0; |
576 | ||
ae63b31e | 577 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 578 | if (ret) |
48966364 | 579 | goto out_put; |
b77e38aa | 580 | } |
b77e38aa SR |
581 | |
582 | ret = read; | |
583 | ||
48966364 | 584 | out_put: |
585 | trace_parser_put(&parser); | |
b77e38aa SR |
586 | |
587 | return ret; | |
588 | } | |
589 | ||
590 | static void * | |
591 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
592 | { | |
ae63b31e SR |
593 | struct ftrace_event_file *file = v; |
594 | struct ftrace_event_call *call; | |
595 | struct trace_array *tr = m->private; | |
b77e38aa SR |
596 | |
597 | (*pos)++; | |
598 | ||
ae63b31e SR |
599 | list_for_each_entry_continue(file, &tr->events, list) { |
600 | call = file->event_call; | |
40e26815 SR |
601 | /* |
602 | * The ftrace subsystem is for showing formats only. | |
603 | * They can not be enabled or disabled via the event files. | |
604 | */ | |
eb63a905 SRRH |
605 | if (call->class && call->class->reg && |
606 | !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
ae63b31e | 607 | return file; |
40e26815 | 608 | } |
b77e38aa | 609 | |
30bd39cd | 610 | return NULL; |
b77e38aa SR |
611 | } |
612 | ||
613 | static void *t_start(struct seq_file *m, loff_t *pos) | |
614 | { | |
ae63b31e SR |
615 | struct ftrace_event_file *file; |
616 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
617 | loff_t l; |
618 | ||
20c8928a | 619 | mutex_lock(&event_mutex); |
e1c7e2a6 | 620 | |
ae63b31e | 621 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 622 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
623 | file = t_next(m, file, &l); |
624 | if (!file) | |
e1c7e2a6 LZ |
625 | break; |
626 | } | |
ae63b31e | 627 | return file; |
b77e38aa SR |
628 | } |
629 | ||
630 | static void * | |
631 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
632 | { | |
ae63b31e SR |
633 | struct ftrace_event_file *file = v; |
634 | struct trace_array *tr = m->private; | |
b77e38aa SR |
635 | |
636 | (*pos)++; | |
637 | ||
ae63b31e SR |
638 | list_for_each_entry_continue(file, &tr->events, list) { |
639 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
640 | return file; | |
b77e38aa SR |
641 | } |
642 | ||
30bd39cd | 643 | return NULL; |
b77e38aa SR |
644 | } |
645 | ||
646 | static void *s_start(struct seq_file *m, loff_t *pos) | |
647 | { | |
ae63b31e SR |
648 | struct ftrace_event_file *file; |
649 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
650 | loff_t l; |
651 | ||
20c8928a | 652 | mutex_lock(&event_mutex); |
e1c7e2a6 | 653 | |
ae63b31e | 654 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 655 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
656 | file = s_next(m, file, &l); |
657 | if (!file) | |
e1c7e2a6 LZ |
658 | break; |
659 | } | |
ae63b31e | 660 | return file; |
b77e38aa SR |
661 | } |
662 | ||
663 | static int t_show(struct seq_file *m, void *v) | |
664 | { | |
ae63b31e SR |
665 | struct ftrace_event_file *file = v; |
666 | struct ftrace_event_call *call = file->event_call; | |
b77e38aa | 667 | |
8f082018 SR |
668 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
669 | seq_printf(m, "%s:", call->class->system); | |
b77e38aa SR |
670 | seq_printf(m, "%s\n", call->name); |
671 | ||
672 | return 0; | |
673 | } | |
674 | ||
675 | static void t_stop(struct seq_file *m, void *p) | |
676 | { | |
20c8928a | 677 | mutex_unlock(&event_mutex); |
b77e38aa SR |
678 | } |
679 | ||
1473e441 SR |
680 | static ssize_t |
681 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
682 | loff_t *ppos) | |
683 | { | |
df89bf77 ON |
684 | struct ftrace_event_file *file; |
685 | unsigned long flags; | |
1473e441 SR |
686 | char *buf; |
687 | ||
df89bf77 ON |
688 | mutex_lock(&event_mutex); |
689 | file = event_file_data(filp); | |
690 | if (likely(file)) | |
691 | flags = file->flags; | |
692 | mutex_unlock(&event_mutex); | |
693 | ||
694 | if (!file) | |
695 | return -ENODEV; | |
696 | ||
697 | if (flags & FTRACE_EVENT_FL_ENABLED) { | |
698 | if (flags & FTRACE_EVENT_FL_SOFT_DISABLED) | |
417944c4 | 699 | buf = "0*\n"; |
df89bf77 | 700 | else if (flags & FTRACE_EVENT_FL_SOFT_MODE) |
30052170 | 701 | buf = "1*\n"; |
417944c4 SRRH |
702 | else |
703 | buf = "1\n"; | |
704 | } else | |
1473e441 SR |
705 | buf = "0\n"; |
706 | ||
417944c4 | 707 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
708 | } |
709 | ||
710 | static ssize_t | |
711 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
712 | loff_t *ppos) | |
713 | { | |
df89bf77 | 714 | struct ftrace_event_file *file; |
1473e441 SR |
715 | unsigned long val; |
716 | int ret; | |
717 | ||
22fe9b54 PH |
718 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
719 | if (ret) | |
1473e441 SR |
720 | return ret; |
721 | ||
1852fcce SR |
722 | ret = tracing_update_buffers(); |
723 | if (ret < 0) | |
724 | return ret; | |
725 | ||
1473e441 SR |
726 | switch (val) { |
727 | case 0: | |
1473e441 | 728 | case 1: |
df89bf77 | 729 | ret = -ENODEV; |
11a241a3 | 730 | mutex_lock(&event_mutex); |
df89bf77 ON |
731 | file = event_file_data(filp); |
732 | if (likely(file)) | |
733 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 734 | mutex_unlock(&event_mutex); |
1473e441 SR |
735 | break; |
736 | ||
737 | default: | |
738 | return -EINVAL; | |
739 | } | |
740 | ||
741 | *ppos += cnt; | |
742 | ||
3b8e4273 | 743 | return ret ? ret : cnt; |
1473e441 SR |
744 | } |
745 | ||
8ae79a13 SR |
746 | static ssize_t |
747 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
748 | loff_t *ppos) | |
749 | { | |
c142b15d | 750 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
ae63b31e SR |
751 | struct ftrace_subsystem_dir *dir = filp->private_data; |
752 | struct event_subsystem *system = dir->subsystem; | |
8ae79a13 | 753 | struct ftrace_event_call *call; |
ae63b31e SR |
754 | struct ftrace_event_file *file; |
755 | struct trace_array *tr = dir->tr; | |
8ae79a13 | 756 | char buf[2]; |
c142b15d | 757 | int set = 0; |
8ae79a13 SR |
758 | int ret; |
759 | ||
8ae79a13 | 760 | mutex_lock(&event_mutex); |
ae63b31e SR |
761 | list_for_each_entry(file, &tr->events, list) { |
762 | call = file->event_call; | |
a1d0ce82 | 763 | if (!call->name || !call->class || !call->class->reg) |
8ae79a13 SR |
764 | continue; |
765 | ||
40ee4dff | 766 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
767 | continue; |
768 | ||
769 | /* | |
770 | * We need to find out if all the events are set | |
771 | * or if all events or cleared, or if we have | |
772 | * a mixture. | |
773 | */ | |
ae63b31e | 774 | set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED)); |
c142b15d | 775 | |
8ae79a13 SR |
776 | /* |
777 | * If we have a mixture, no need to look further. | |
778 | */ | |
c142b15d | 779 | if (set == 3) |
8ae79a13 SR |
780 | break; |
781 | } | |
782 | mutex_unlock(&event_mutex); | |
783 | ||
c142b15d | 784 | buf[0] = set_to_char[set]; |
8ae79a13 | 785 | buf[1] = '\n'; |
8ae79a13 SR |
786 | |
787 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
788 | ||
789 | return ret; | |
790 | } | |
791 | ||
792 | static ssize_t | |
793 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
794 | loff_t *ppos) | |
795 | { | |
ae63b31e SR |
796 | struct ftrace_subsystem_dir *dir = filp->private_data; |
797 | struct event_subsystem *system = dir->subsystem; | |
40ee4dff | 798 | const char *name = NULL; |
8ae79a13 | 799 | unsigned long val; |
8ae79a13 SR |
800 | ssize_t ret; |
801 | ||
22fe9b54 PH |
802 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
803 | if (ret) | |
8ae79a13 SR |
804 | return ret; |
805 | ||
806 | ret = tracing_update_buffers(); | |
807 | if (ret < 0) | |
808 | return ret; | |
809 | ||
8f31bfe5 | 810 | if (val != 0 && val != 1) |
8ae79a13 | 811 | return -EINVAL; |
8ae79a13 | 812 | |
40ee4dff SR |
813 | /* |
814 | * Opening of "enable" adds a ref count to system, | |
815 | * so the name is safe to use. | |
816 | */ | |
817 | if (system) | |
818 | name = system->name; | |
819 | ||
ae63b31e | 820 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 821 | if (ret) |
8f31bfe5 | 822 | goto out; |
8ae79a13 SR |
823 | |
824 | ret = cnt; | |
825 | ||
8f31bfe5 | 826 | out: |
8ae79a13 SR |
827 | *ppos += cnt; |
828 | ||
829 | return ret; | |
830 | } | |
831 | ||
2a37a3df SR |
832 | enum { |
833 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
834 | FORMAT_FIELD_SEPERATOR = 2, |
835 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
836 | }; |
837 | ||
838 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 839 | { |
b86d0ba6 | 840 | struct ftrace_event_call *call = event_file_data(m->private); |
5a65e956 | 841 | struct ftrace_event_field *field; |
86397dc3 LZ |
842 | struct list_head *common_head = &ftrace_common_fields; |
843 | struct list_head *head = trace_get_fields(call); | |
981d081e | 844 | |
2a37a3df | 845 | (*pos)++; |
5a65e956 | 846 | |
2a37a3df SR |
847 | switch ((unsigned long)v) { |
848 | case FORMAT_HEADER: | |
86397dc3 LZ |
849 | if (unlikely(list_empty(common_head))) |
850 | return NULL; | |
851 | ||
852 | field = list_entry(common_head->prev, | |
853 | struct ftrace_event_field, link); | |
854 | return field; | |
5a65e956 | 855 | |
86397dc3 | 856 | case FORMAT_FIELD_SEPERATOR: |
2a37a3df SR |
857 | if (unlikely(list_empty(head))) |
858 | return NULL; | |
5a65e956 | 859 | |
2a37a3df SR |
860 | field = list_entry(head->prev, struct ftrace_event_field, link); |
861 | return field; | |
5a65e956 | 862 | |
2a37a3df SR |
863 | case FORMAT_PRINTFMT: |
864 | /* all done */ | |
865 | return NULL; | |
5a65e956 LJ |
866 | } |
867 | ||
2a37a3df | 868 | field = v; |
86397dc3 LZ |
869 | if (field->link.prev == common_head) |
870 | return (void *)FORMAT_FIELD_SEPERATOR; | |
871 | else if (field->link.prev == head) | |
2a37a3df SR |
872 | return (void *)FORMAT_PRINTFMT; |
873 | ||
874 | field = list_entry(field->link.prev, struct ftrace_event_field, link); | |
875 | ||
2a37a3df | 876 | return field; |
8728fe50 | 877 | } |
5a65e956 | 878 | |
2a37a3df | 879 | static void *f_start(struct seq_file *m, loff_t *pos) |
8728fe50 | 880 | { |
2a37a3df SR |
881 | loff_t l = 0; |
882 | void *p; | |
5a65e956 | 883 | |
b86d0ba6 ON |
884 | /* ->stop() is called even if ->start() fails */ |
885 | mutex_lock(&event_mutex); | |
886 | if (!event_file_data(m->private)) | |
887 | return ERR_PTR(-ENODEV); | |
888 | ||
2a37a3df SR |
889 | /* Start by showing the header */ |
890 | if (!*pos) | |
891 | return (void *)FORMAT_HEADER; | |
892 | ||
893 | p = (void *)FORMAT_HEADER; | |
894 | do { | |
895 | p = f_next(m, p, &l); | |
896 | } while (p && l < *pos); | |
897 | ||
898 | return p; | |
899 | } | |
900 | ||
901 | static int f_show(struct seq_file *m, void *v) | |
902 | { | |
b86d0ba6 | 903 | struct ftrace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
904 | struct ftrace_event_field *field; |
905 | const char *array_descriptor; | |
906 | ||
907 | switch ((unsigned long)v) { | |
908 | case FORMAT_HEADER: | |
909 | seq_printf(m, "name: %s\n", call->name); | |
910 | seq_printf(m, "ID: %d\n", call->event.type); | |
911 | seq_printf(m, "format:\n"); | |
8728fe50 | 912 | return 0; |
5a65e956 | 913 | |
86397dc3 LZ |
914 | case FORMAT_FIELD_SEPERATOR: |
915 | seq_putc(m, '\n'); | |
916 | return 0; | |
917 | ||
2a37a3df SR |
918 | case FORMAT_PRINTFMT: |
919 | seq_printf(m, "\nprint fmt: %s\n", | |
920 | call->print_fmt); | |
921 | return 0; | |
981d081e | 922 | } |
8728fe50 | 923 | |
2a37a3df | 924 | field = v; |
8728fe50 | 925 | |
2a37a3df SR |
926 | /* |
927 | * Smartly shows the array type(except dynamic array). | |
928 | * Normal: | |
929 | * field:TYPE VAR | |
930 | * If TYPE := TYPE[LEN], it is shown: | |
931 | * field:TYPE VAR[LEN] | |
932 | */ | |
933 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 934 | |
2a37a3df SR |
935 | if (!strncmp(field->type, "__data_loc", 10)) |
936 | array_descriptor = NULL; | |
8728fe50 | 937 | |
2a37a3df SR |
938 | if (!array_descriptor) |
939 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
940 | field->type, field->name, field->offset, | |
941 | field->size, !!field->is_signed); | |
942 | else | |
943 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
944 | (int)(array_descriptor - field->type), | |
945 | field->type, field->name, | |
946 | array_descriptor, field->offset, | |
947 | field->size, !!field->is_signed); | |
8728fe50 | 948 | |
2a37a3df SR |
949 | return 0; |
950 | } | |
5a65e956 | 951 | |
2a37a3df SR |
952 | static void f_stop(struct seq_file *m, void *p) |
953 | { | |
b86d0ba6 | 954 | mutex_unlock(&event_mutex); |
2a37a3df | 955 | } |
981d081e | 956 | |
2a37a3df SR |
957 | static const struct seq_operations trace_format_seq_ops = { |
958 | .start = f_start, | |
959 | .next = f_next, | |
960 | .stop = f_stop, | |
961 | .show = f_show, | |
962 | }; | |
963 | ||
964 | static int trace_format_open(struct inode *inode, struct file *file) | |
965 | { | |
2a37a3df SR |
966 | struct seq_file *m; |
967 | int ret; | |
968 | ||
969 | ret = seq_open(file, &trace_format_seq_ops); | |
970 | if (ret < 0) | |
971 | return ret; | |
972 | ||
973 | m = file->private_data; | |
b86d0ba6 | 974 | m->private = file; |
2a37a3df SR |
975 | |
976 | return 0; | |
981d081e SR |
977 | } |
978 | ||
23725aee PZ |
979 | static ssize_t |
980 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
981 | { | |
fdb65fe2 | 982 | int id = (long)event_file_data(filp); |
23725aee PZ |
983 | struct trace_seq *s; |
984 | int r; | |
985 | ||
986 | if (*ppos) | |
987 | return 0; | |
988 | ||
fdb65fe2 ON |
989 | if (unlikely(!id)) |
990 | return -ENODEV; | |
991 | ||
23725aee PZ |
992 | s = kmalloc(sizeof(*s), GFP_KERNEL); |
993 | if (!s) | |
994 | return -ENOMEM; | |
995 | ||
996 | trace_seq_init(s); | |
fdb65fe2 | 997 | trace_seq_printf(s, "%d\n", id); |
23725aee PZ |
998 | |
999 | r = simple_read_from_buffer(ubuf, cnt, ppos, | |
1000 | s->buffer, s->len); | |
1001 | kfree(s); | |
1002 | return r; | |
1003 | } | |
1004 | ||
7ce7e424 TZ |
1005 | static ssize_t |
1006 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1007 | loff_t *ppos) | |
1008 | { | |
70c91fb9 | 1009 | struct ftrace_event_call *call; |
7ce7e424 | 1010 | struct trace_seq *s; |
70c91fb9 | 1011 | int r = -ENODEV; |
7ce7e424 TZ |
1012 | |
1013 | if (*ppos) | |
1014 | return 0; | |
1015 | ||
1016 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
70c91fb9 | 1017 | |
7ce7e424 TZ |
1018 | if (!s) |
1019 | return -ENOMEM; | |
1020 | ||
1021 | trace_seq_init(s); | |
1022 | ||
70c91fb9 ON |
1023 | mutex_lock(&event_mutex); |
1024 | call = event_file_data(filp); | |
1025 | if (call) | |
1026 | print_event_filter(call, s); | |
1027 | mutex_unlock(&event_mutex); | |
1028 | ||
1029 | if (call) | |
1030 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
7ce7e424 TZ |
1031 | |
1032 | kfree(s); | |
1033 | ||
1034 | return r; | |
1035 | } | |
1036 | ||
1037 | static ssize_t | |
1038 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1039 | loff_t *ppos) | |
1040 | { | |
70c91fb9 | 1041 | struct ftrace_event_call *call; |
8b372562 | 1042 | char *buf; |
70c91fb9 | 1043 | int err = -ENODEV; |
7ce7e424 | 1044 | |
8b372562 | 1045 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1046 | return -EINVAL; |
1047 | ||
8b372562 TZ |
1048 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1049 | if (!buf) | |
7ce7e424 TZ |
1050 | return -ENOMEM; |
1051 | ||
8b372562 TZ |
1052 | if (copy_from_user(buf, ubuf, cnt)) { |
1053 | free_page((unsigned long) buf); | |
1054 | return -EFAULT; | |
7ce7e424 | 1055 | } |
8b372562 | 1056 | buf[cnt] = '\0'; |
7ce7e424 | 1057 | |
70c91fb9 ON |
1058 | mutex_lock(&event_mutex); |
1059 | call = event_file_data(filp); | |
1060 | if (call) | |
1061 | err = apply_event_filter(call, buf); | |
1062 | mutex_unlock(&event_mutex); | |
1063 | ||
8b372562 TZ |
1064 | free_page((unsigned long) buf); |
1065 | if (err < 0) | |
44e9c8b7 | 1066 | return err; |
0a19e53c | 1067 | |
7ce7e424 TZ |
1068 | *ppos += cnt; |
1069 | ||
1070 | return cnt; | |
1071 | } | |
1072 | ||
e9dbfae5 SR |
1073 | static LIST_HEAD(event_subsystems); |
1074 | ||
1075 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1076 | { | |
1077 | struct event_subsystem *system = NULL; | |
ae63b31e SR |
1078 | struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
1079 | struct trace_array *tr; | |
e9dbfae5 SR |
1080 | int ret; |
1081 | ||
1082 | /* Make sure the system still exists */ | |
9713f785 | 1083 | mutex_lock(&trace_types_lock); |
e9dbfae5 | 1084 | mutex_lock(&event_mutex); |
ae63b31e SR |
1085 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1086 | list_for_each_entry(dir, &tr->systems, list) { | |
1087 | if (dir == inode->i_private) { | |
1088 | /* Don't open systems with no events */ | |
1089 | if (dir->nr_events) { | |
1090 | __get_system_dir(dir); | |
1091 | system = dir->subsystem; | |
1092 | } | |
1093 | goto exit_loop; | |
e9dbfae5 | 1094 | } |
e9dbfae5 SR |
1095 | } |
1096 | } | |
ae63b31e | 1097 | exit_loop: |
e9dbfae5 | 1098 | mutex_unlock(&event_mutex); |
9713f785 | 1099 | mutex_unlock(&trace_types_lock); |
e9dbfae5 | 1100 | |
ae63b31e | 1101 | if (!system) |
e9dbfae5 SR |
1102 | return -ENODEV; |
1103 | ||
ae63b31e SR |
1104 | /* Some versions of gcc think dir can be uninitialized here */ |
1105 | WARN_ON(!dir); | |
1106 | ||
fc82a11a SRRH |
1107 | /* Still need to increment the ref count of the system */ |
1108 | if (trace_array_get(tr) < 0) { | |
1109 | put_system(dir); | |
1110 | return -ENODEV; | |
1111 | } | |
1112 | ||
e9dbfae5 | 1113 | ret = tracing_open_generic(inode, filp); |
fc82a11a SRRH |
1114 | if (ret < 0) { |
1115 | trace_array_put(tr); | |
ae63b31e | 1116 | put_system(dir); |
fc82a11a | 1117 | } |
ae63b31e SR |
1118 | |
1119 | return ret; | |
1120 | } | |
1121 | ||
1122 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1123 | { | |
1124 | struct ftrace_subsystem_dir *dir; | |
1125 | struct trace_array *tr = inode->i_private; | |
1126 | int ret; | |
1127 | ||
fc82a11a SRRH |
1128 | if (trace_array_get(tr) < 0) |
1129 | return -ENODEV; | |
1130 | ||
ae63b31e SR |
1131 | /* Make a temporary dir that has no system but points to tr */ |
1132 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
fc82a11a SRRH |
1133 | if (!dir) { |
1134 | trace_array_put(tr); | |
ae63b31e | 1135 | return -ENOMEM; |
fc82a11a | 1136 | } |
ae63b31e SR |
1137 | |
1138 | dir->tr = tr; | |
1139 | ||
1140 | ret = tracing_open_generic(inode, filp); | |
fc82a11a SRRH |
1141 | if (ret < 0) { |
1142 | trace_array_put(tr); | |
ae63b31e | 1143 | kfree(dir); |
fc82a11a | 1144 | } |
ae63b31e SR |
1145 | |
1146 | filp->private_data = dir; | |
e9dbfae5 SR |
1147 | |
1148 | return ret; | |
1149 | } | |
1150 | ||
1151 | static int subsystem_release(struct inode *inode, struct file *file) | |
1152 | { | |
ae63b31e | 1153 | struct ftrace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1154 | |
fc82a11a SRRH |
1155 | trace_array_put(dir->tr); |
1156 | ||
ae63b31e SR |
1157 | /* |
1158 | * If dir->subsystem is NULL, then this is a temporary | |
1159 | * descriptor that was made for a trace_array to enable | |
1160 | * all subsystems. | |
1161 | */ | |
1162 | if (dir->subsystem) | |
1163 | put_system(dir); | |
1164 | else | |
1165 | kfree(dir); | |
e9dbfae5 SR |
1166 | |
1167 | return 0; | |
1168 | } | |
1169 | ||
cfb180f3 TZ |
1170 | static ssize_t |
1171 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1172 | loff_t *ppos) | |
1173 | { | |
ae63b31e SR |
1174 | struct ftrace_subsystem_dir *dir = filp->private_data; |
1175 | struct event_subsystem *system = dir->subsystem; | |
cfb180f3 TZ |
1176 | struct trace_seq *s; |
1177 | int r; | |
1178 | ||
1179 | if (*ppos) | |
1180 | return 0; | |
1181 | ||
1182 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1183 | if (!s) | |
1184 | return -ENOMEM; | |
1185 | ||
1186 | trace_seq_init(s); | |
1187 | ||
8b372562 | 1188 | print_subsystem_event_filter(system, s); |
4bda2d51 | 1189 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); |
cfb180f3 TZ |
1190 | |
1191 | kfree(s); | |
1192 | ||
1193 | return r; | |
1194 | } | |
1195 | ||
1196 | static ssize_t | |
1197 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1198 | loff_t *ppos) | |
1199 | { | |
ae63b31e | 1200 | struct ftrace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1201 | char *buf; |
cfb180f3 TZ |
1202 | int err; |
1203 | ||
8b372562 | 1204 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1205 | return -EINVAL; |
1206 | ||
8b372562 TZ |
1207 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1208 | if (!buf) | |
cfb180f3 TZ |
1209 | return -ENOMEM; |
1210 | ||
8b372562 TZ |
1211 | if (copy_from_user(buf, ubuf, cnt)) { |
1212 | free_page((unsigned long) buf); | |
1213 | return -EFAULT; | |
cfb180f3 | 1214 | } |
8b372562 | 1215 | buf[cnt] = '\0'; |
cfb180f3 | 1216 | |
ae63b31e | 1217 | err = apply_subsystem_event_filter(dir, buf); |
8b372562 TZ |
1218 | free_page((unsigned long) buf); |
1219 | if (err < 0) | |
44e9c8b7 | 1220 | return err; |
cfb180f3 TZ |
1221 | |
1222 | *ppos += cnt; | |
1223 | ||
1224 | return cnt; | |
1225 | } | |
1226 | ||
d1b182a8 SR |
1227 | static ssize_t |
1228 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1229 | { | |
1230 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1231 | struct trace_seq *s; | |
1232 | int r; | |
1233 | ||
1234 | if (*ppos) | |
1235 | return 0; | |
1236 | ||
1237 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1238 | if (!s) | |
1239 | return -ENOMEM; | |
1240 | ||
1241 | trace_seq_init(s); | |
1242 | ||
1243 | func(s); | |
1244 | r = simple_read_from_buffer(ubuf, cnt, ppos, s->buffer, s->len); | |
1245 | ||
1246 | kfree(s); | |
1247 | ||
1248 | return r; | |
1249 | } | |
1250 | ||
15075cac SR |
1251 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1252 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
e45ccd09 | 1253 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1254 | |
b77e38aa SR |
1255 | static const struct seq_operations show_event_seq_ops = { |
1256 | .start = t_start, | |
1257 | .next = t_next, | |
1258 | .show = t_show, | |
1259 | .stop = t_stop, | |
1260 | }; | |
1261 | ||
1262 | static const struct seq_operations show_set_event_seq_ops = { | |
1263 | .start = s_start, | |
1264 | .next = s_next, | |
1265 | .show = t_show, | |
1266 | .stop = t_stop, | |
1267 | }; | |
1268 | ||
2314c4ae | 1269 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1270 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1271 | .read = seq_read, |
1272 | .llseek = seq_lseek, | |
1273 | .release = seq_release, | |
1274 | }; | |
1275 | ||
b77e38aa | 1276 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1277 | .open = ftrace_event_set_open, |
b77e38aa SR |
1278 | .read = seq_read, |
1279 | .write = ftrace_event_write, | |
1280 | .llseek = seq_lseek, | |
e45ccd09 | 1281 | .release = ftrace_event_release, |
b77e38aa SR |
1282 | }; |
1283 | ||
1473e441 | 1284 | static const struct file_operations ftrace_enable_fops = { |
012dc156 | 1285 | .open = tracing_open_generic, |
1473e441 SR |
1286 | .read = event_enable_read, |
1287 | .write = event_enable_write, | |
6038f373 | 1288 | .llseek = default_llseek, |
1473e441 SR |
1289 | }; |
1290 | ||
981d081e | 1291 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1292 | .open = trace_format_open, |
1293 | .read = seq_read, | |
1294 | .llseek = seq_lseek, | |
1295 | .release = seq_release, | |
981d081e SR |
1296 | }; |
1297 | ||
23725aee | 1298 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1299 | .read = event_id_read, |
6038f373 | 1300 | .llseek = default_llseek, |
23725aee PZ |
1301 | }; |
1302 | ||
7ce7e424 TZ |
1303 | static const struct file_operations ftrace_event_filter_fops = { |
1304 | .open = tracing_open_generic, | |
1305 | .read = event_filter_read, | |
1306 | .write = event_filter_write, | |
6038f373 | 1307 | .llseek = default_llseek, |
7ce7e424 TZ |
1308 | }; |
1309 | ||
cfb180f3 | 1310 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1311 | .open = subsystem_open, |
cfb180f3 TZ |
1312 | .read = subsystem_filter_read, |
1313 | .write = subsystem_filter_write, | |
6038f373 | 1314 | .llseek = default_llseek, |
e9dbfae5 | 1315 | .release = subsystem_release, |
cfb180f3 TZ |
1316 | }; |
1317 | ||
8ae79a13 | 1318 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1319 | .open = subsystem_open, |
8ae79a13 SR |
1320 | .read = system_enable_read, |
1321 | .write = system_enable_write, | |
6038f373 | 1322 | .llseek = default_llseek, |
40ee4dff | 1323 | .release = subsystem_release, |
8ae79a13 SR |
1324 | }; |
1325 | ||
ae63b31e SR |
1326 | static const struct file_operations ftrace_tr_enable_fops = { |
1327 | .open = system_tr_open, | |
1328 | .read = system_enable_read, | |
1329 | .write = system_enable_write, | |
1330 | .llseek = default_llseek, | |
1331 | .release = subsystem_release, | |
1332 | }; | |
1333 | ||
d1b182a8 SR |
1334 | static const struct file_operations ftrace_show_header_fops = { |
1335 | .open = tracing_open_generic, | |
1336 | .read = show_header, | |
6038f373 | 1337 | .llseek = default_llseek, |
d1b182a8 SR |
1338 | }; |
1339 | ||
ae63b31e SR |
1340 | static int |
1341 | ftrace_event_open(struct inode *inode, struct file *file, | |
1342 | const struct seq_operations *seq_ops) | |
1473e441 | 1343 | { |
ae63b31e SR |
1344 | struct seq_file *m; |
1345 | int ret; | |
1473e441 | 1346 | |
ae63b31e SR |
1347 | ret = seq_open(file, seq_ops); |
1348 | if (ret < 0) | |
1349 | return ret; | |
1350 | m = file->private_data; | |
1351 | /* copy tr over to seq ops */ | |
1352 | m->private = inode->i_private; | |
1473e441 | 1353 | |
ae63b31e | 1354 | return ret; |
1473e441 SR |
1355 | } |
1356 | ||
e45ccd09 AL |
1357 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1358 | { | |
1359 | struct trace_array *tr = inode->i_private; | |
1360 | ||
1361 | trace_array_put(tr); | |
1362 | ||
1363 | return seq_release(inode, file); | |
1364 | } | |
1365 | ||
15075cac SR |
1366 | static int |
1367 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1368 | { | |
1369 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1370 | ||
ae63b31e | 1371 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1372 | } |
1373 | ||
1374 | static int | |
1375 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1376 | { | |
1377 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1378 | struct trace_array *tr = inode->i_private; |
e45ccd09 AL |
1379 | int ret; |
1380 | ||
1381 | if (trace_array_get(tr) < 0) | |
1382 | return -ENODEV; | |
15075cac SR |
1383 | |
1384 | if ((file->f_mode & FMODE_WRITE) && | |
1385 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1386 | ftrace_clear_events(tr); |
15075cac | 1387 | |
e45ccd09 AL |
1388 | ret = ftrace_event_open(inode, file, seq_ops); |
1389 | if (ret < 0) | |
1390 | trace_array_put(tr); | |
1391 | return ret; | |
ae63b31e SR |
1392 | } |
1393 | ||
1394 | static struct event_subsystem * | |
1395 | create_new_subsystem(const char *name) | |
1396 | { | |
1397 | struct event_subsystem *system; | |
1398 | ||
1399 | /* need to create new entry */ | |
1400 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1401 | if (!system) | |
1402 | return NULL; | |
1403 | ||
1404 | system->ref_count = 1; | |
e6929efa SR |
1405 | |
1406 | /* Only allocate if dynamic (kprobes and modules) */ | |
1407 | if (!core_kernel_data((unsigned long)name)) { | |
1408 | system->ref_count |= SYSTEM_FL_FREE_NAME; | |
1409 | system->name = kstrdup(name, GFP_KERNEL); | |
1410 | if (!system->name) | |
1411 | goto out_free; | |
1412 | } else | |
1413 | system->name = name; | |
ae63b31e SR |
1414 | |
1415 | system->filter = NULL; | |
1416 | ||
1417 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1418 | if (!system->filter) | |
1419 | goto out_free; | |
1420 | ||
1421 | list_add(&system->list, &event_subsystems); | |
1422 | ||
1423 | return system; | |
1424 | ||
1425 | out_free: | |
e6929efa SR |
1426 | if (system->ref_count & SYSTEM_FL_FREE_NAME) |
1427 | kfree(system->name); | |
ae63b31e SR |
1428 | kfree(system); |
1429 | return NULL; | |
15075cac SR |
1430 | } |
1431 | ||
6ecc2d1c | 1432 | static struct dentry * |
ae63b31e SR |
1433 | event_subsystem_dir(struct trace_array *tr, const char *name, |
1434 | struct ftrace_event_file *file, struct dentry *parent) | |
6ecc2d1c | 1435 | { |
ae63b31e | 1436 | struct ftrace_subsystem_dir *dir; |
6ecc2d1c | 1437 | struct event_subsystem *system; |
e1112b4d | 1438 | struct dentry *entry; |
6ecc2d1c SR |
1439 | |
1440 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1441 | list_for_each_entry(dir, &tr->systems, list) { |
1442 | system = dir->subsystem; | |
dc82ec98 | 1443 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1444 | dir->nr_events++; |
1445 | file->system = dir; | |
1446 | return dir->entry; | |
dc82ec98 | 1447 | } |
6ecc2d1c SR |
1448 | } |
1449 | ||
ae63b31e SR |
1450 | /* Now see if the system itself exists. */ |
1451 | list_for_each_entry(system, &event_subsystems, list) { | |
1452 | if (strcmp(system->name, name) == 0) | |
1453 | break; | |
6ecc2d1c | 1454 | } |
ae63b31e SR |
1455 | /* Reset system variable when not found */ |
1456 | if (&system->list == &event_subsystems) | |
1457 | system = NULL; | |
6ecc2d1c | 1458 | |
ae63b31e SR |
1459 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1460 | if (!dir) | |
1461 | goto out_fail; | |
6ecc2d1c | 1462 | |
ae63b31e SR |
1463 | if (!system) { |
1464 | system = create_new_subsystem(name); | |
1465 | if (!system) | |
1466 | goto out_free; | |
1467 | } else | |
1468 | __get_system(system); | |
1469 | ||
1470 | dir->entry = debugfs_create_dir(name, parent); | |
1471 | if (!dir->entry) { | |
1472 | pr_warning("Failed to create system directory %s\n", name); | |
1473 | __put_system(system); | |
1474 | goto out_free; | |
6d723736 SR |
1475 | } |
1476 | ||
ae63b31e SR |
1477 | dir->tr = tr; |
1478 | dir->ref_count = 1; | |
1479 | dir->nr_events = 1; | |
1480 | dir->subsystem = system; | |
1481 | file->system = dir; | |
8b372562 | 1482 | |
ae63b31e | 1483 | entry = debugfs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1484 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1485 | if (!entry) { |
1486 | kfree(system->filter); | |
1487 | system->filter = NULL; | |
ae63b31e | 1488 | pr_warning("Could not create debugfs '%s/filter' entry\n", name); |
8b372562 | 1489 | } |
e1112b4d | 1490 | |
ae63b31e | 1491 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1492 | &ftrace_system_enable_fops); |
8ae79a13 | 1493 | |
ae63b31e SR |
1494 | list_add(&dir->list, &tr->systems); |
1495 | ||
1496 | return dir->entry; | |
1497 | ||
1498 | out_free: | |
1499 | kfree(dir); | |
1500 | out_fail: | |
1501 | /* Only print this message if failed on memory allocation */ | |
1502 | if (!dir || !system) | |
1503 | pr_warning("No memory to create event subsystem %s\n", | |
1504 | name); | |
1505 | return NULL; | |
6ecc2d1c SR |
1506 | } |
1507 | ||
1473e441 | 1508 | static int |
ae63b31e SR |
1509 | event_create_dir(struct dentry *parent, |
1510 | struct ftrace_event_file *file, | |
701970b3 SR |
1511 | const struct file_operations *id, |
1512 | const struct file_operations *enable, | |
1513 | const struct file_operations *filter, | |
1514 | const struct file_operations *format) | |
1473e441 | 1515 | { |
ae63b31e SR |
1516 | struct ftrace_event_call *call = file->event_call; |
1517 | struct trace_array *tr = file->tr; | |
2e33af02 | 1518 | struct list_head *head; |
ae63b31e | 1519 | struct dentry *d_events; |
fd994989 | 1520 | int ret; |
1473e441 | 1521 | |
6ecc2d1c SR |
1522 | /* |
1523 | * If the trace point header did not define TRACE_SYSTEM | |
1524 | * then the system would be called "TRACE_SYSTEM". | |
1525 | */ | |
ae63b31e SR |
1526 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1527 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1528 | if (!d_events) | |
1529 | return -ENOMEM; | |
1530 | } else | |
1531 | d_events = parent; | |
1532 | ||
1533 | file->dir = debugfs_create_dir(call->name, d_events); | |
1534 | if (!file->dir) { | |
1535 | pr_warning("Could not create debugfs '%s' directory\n", | |
1536 | call->name); | |
1473e441 SR |
1537 | return -1; |
1538 | } | |
1539 | ||
9b63776f | 1540 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1541 | trace_create_file("enable", 0644, file->dir, file, |
f3f3f009 | 1542 | enable); |
1473e441 | 1543 | |
2239291a | 1544 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1545 | if (call->event.type && call->class->reg) |
fdb65fe2 ON |
1546 | trace_create_file("id", 0444, file->dir, |
1547 | (void *)(long)call->event.type, id); | |
2239291a | 1548 | #endif |
23725aee | 1549 | |
c9d932cf LZ |
1550 | /* |
1551 | * Other events may have the same class. Only update | |
1552 | * the fields if they are not already defined. | |
1553 | */ | |
1554 | head = trace_get_fields(call); | |
1555 | if (list_empty(head)) { | |
1556 | ret = call->class->define_fields(call); | |
1557 | if (ret < 0) { | |
1558 | pr_warning("Could not initialize trace point" | |
1559 | " events/%s\n", call->name); | |
ae63b31e | 1560 | return -1; |
cf027f64 TZ |
1561 | } |
1562 | } | |
ae63b31e | 1563 | trace_create_file("filter", 0644, file->dir, call, |
c9d932cf | 1564 | filter); |
cf027f64 | 1565 | |
ae63b31e | 1566 | trace_create_file("format", 0444, file->dir, call, |
f3f3f009 | 1567 | format); |
6d723736 SR |
1568 | |
1569 | return 0; | |
1570 | } | |
1571 | ||
ae63b31e SR |
1572 | static void remove_event_from_tracers(struct ftrace_event_call *call) |
1573 | { | |
1574 | struct ftrace_event_file *file; | |
1575 | struct trace_array *tr; | |
1576 | ||
1577 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
1578 | if (file->event_call != call) |
1579 | continue; | |
1580 | ||
c6febdf2 | 1581 | remove_event_file_dir(file); |
ae63b31e SR |
1582 | /* |
1583 | * The do_for_each_event_file_safe() is | |
1584 | * a double loop. After finding the call for this | |
1585 | * trace_array, we use break to jump to the next | |
1586 | * trace_array. | |
1587 | */ | |
1588 | break; | |
1589 | } while_for_each_event_file(); | |
1590 | } | |
1591 | ||
8781915a EG |
1592 | static void event_remove(struct ftrace_event_call *call) |
1593 | { | |
ae63b31e SR |
1594 | struct trace_array *tr; |
1595 | struct ftrace_event_file *file; | |
1596 | ||
1597 | do_for_each_event_file(tr, file) { | |
1598 | if (file->event_call != call) | |
1599 | continue; | |
1600 | ftrace_event_enable_disable(file, 0); | |
1601 | /* | |
1602 | * The do_for_each_event_file() is | |
1603 | * a double loop. After finding the call for this | |
1604 | * trace_array, we use break to jump to the next | |
1605 | * trace_array. | |
1606 | */ | |
1607 | break; | |
1608 | } while_for_each_event_file(); | |
1609 | ||
8781915a EG |
1610 | if (call->event.funcs) |
1611 | __unregister_ftrace_event(&call->event); | |
ae63b31e | 1612 | remove_event_from_tracers(call); |
8781915a EG |
1613 | list_del(&call->list); |
1614 | } | |
1615 | ||
1616 | static int event_init(struct ftrace_event_call *call) | |
1617 | { | |
1618 | int ret = 0; | |
1619 | ||
1620 | if (WARN_ON(!call->name)) | |
1621 | return -EINVAL; | |
1622 | ||
1623 | if (call->class->raw_init) { | |
1624 | ret = call->class->raw_init(call); | |
1625 | if (ret < 0 && ret != -ENOSYS) | |
1626 | pr_warn("Could not initialize trace events/%s\n", | |
1627 | call->name); | |
1628 | } | |
1629 | ||
1630 | return ret; | |
1631 | } | |
1632 | ||
67ead0a6 | 1633 | static int |
ae63b31e | 1634 | __register_event(struct ftrace_event_call *call, struct module *mod) |
bd1a5c84 | 1635 | { |
bd1a5c84 | 1636 | int ret; |
6d723736 | 1637 | |
8781915a EG |
1638 | ret = event_init(call); |
1639 | if (ret < 0) | |
1640 | return ret; | |
701970b3 | 1641 | |
ae63b31e | 1642 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 1643 | call->mod = mod; |
88f70d75 | 1644 | |
ae63b31e | 1645 | return 0; |
bd1a5c84 MH |
1646 | } |
1647 | ||
da511bf3 SRRH |
1648 | static struct ftrace_event_file * |
1649 | trace_create_new_event(struct ftrace_event_call *call, | |
1650 | struct trace_array *tr) | |
1651 | { | |
1652 | struct ftrace_event_file *file; | |
1653 | ||
1654 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
1655 | if (!file) | |
1656 | return NULL; | |
1657 | ||
1658 | file->event_call = call; | |
1659 | file->tr = tr; | |
1660 | atomic_set(&file->sm_ref, 0); | |
1661 | list_add(&file->list, &tr->events); | |
1662 | ||
1663 | return file; | |
1664 | } | |
1665 | ||
ae63b31e SR |
1666 | /* Add an event to a trace directory */ |
1667 | static int | |
1668 | __trace_add_new_event(struct ftrace_event_call *call, | |
1669 | struct trace_array *tr, | |
1670 | const struct file_operations *id, | |
1671 | const struct file_operations *enable, | |
1672 | const struct file_operations *filter, | |
1673 | const struct file_operations *format) | |
1674 | { | |
1675 | struct ftrace_event_file *file; | |
1676 | ||
da511bf3 | 1677 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
1678 | if (!file) |
1679 | return -ENOMEM; | |
1680 | ||
ae63b31e SR |
1681 | return event_create_dir(tr->event_dir, file, id, enable, filter, format); |
1682 | } | |
1683 | ||
77248221 SR |
1684 | /* |
1685 | * Just create a decriptor for early init. A descriptor is required | |
1686 | * for enabling events at boot. We want to enable events before | |
1687 | * the filesystem is initialized. | |
1688 | */ | |
1689 | static __init int | |
1690 | __trace_early_add_new_event(struct ftrace_event_call *call, | |
1691 | struct trace_array *tr) | |
1692 | { | |
1693 | struct ftrace_event_file *file; | |
1694 | ||
da511bf3 | 1695 | file = trace_create_new_event(call, tr); |
77248221 SR |
1696 | if (!file) |
1697 | return -ENOMEM; | |
1698 | ||
77248221 SR |
1699 | return 0; |
1700 | } | |
1701 | ||
ae63b31e SR |
1702 | struct ftrace_module_file_ops; |
1703 | static void __add_event_to_tracers(struct ftrace_event_call *call, | |
1704 | struct ftrace_module_file_ops *file_ops); | |
1705 | ||
bd1a5c84 MH |
1706 | /* Add an additional event_call dynamically */ |
1707 | int trace_add_event_call(struct ftrace_event_call *call) | |
1708 | { | |
1709 | int ret; | |
9713f785 | 1710 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 1711 | mutex_lock(&event_mutex); |
701970b3 | 1712 | |
ae63b31e SR |
1713 | ret = __register_event(call, NULL); |
1714 | if (ret >= 0) | |
1715 | __add_event_to_tracers(call, NULL); | |
a2ca5e03 | 1716 | |
ae63b31e | 1717 | mutex_unlock(&event_mutex); |
9713f785 | 1718 | mutex_unlock(&trace_types_lock); |
ae63b31e | 1719 | return ret; |
a2ca5e03 FW |
1720 | } |
1721 | ||
4fead8e4 | 1722 | /* |
9713f785 AL |
1723 | * Must be called under locking of trace_types_lock, event_mutex and |
1724 | * trace_event_sem. | |
4fead8e4 | 1725 | */ |
bd1a5c84 MH |
1726 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1727 | { | |
8781915a | 1728 | event_remove(call); |
bd1a5c84 MH |
1729 | trace_destroy_fields(call); |
1730 | destroy_preds(call); | |
bd1a5c84 MH |
1731 | } |
1732 | ||
8169887b ON |
1733 | static int probe_remove_event_call(struct ftrace_event_call *call) |
1734 | { | |
1735 | struct trace_array *tr; | |
1736 | struct ftrace_event_file *file; | |
1737 | ||
1738 | #ifdef CONFIG_PERF_EVENTS | |
1739 | if (call->perf_refcount) | |
1740 | return -EBUSY; | |
1741 | #endif | |
1742 | do_for_each_event_file(tr, file) { | |
1743 | if (file->event_call != call) | |
1744 | continue; | |
1745 | /* | |
1746 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
1747 | * we are going to do, FTRACE_EVENT_FL_SOFT_MODE can suppress | |
1748 | * TRACE_REG_UNREGISTER. | |
1749 | */ | |
1750 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
1751 | return -EBUSY; | |
1752 | break; | |
1753 | } while_for_each_event_file(); | |
1754 | ||
1755 | __trace_remove_event_call(call); | |
1756 | ||
1757 | return 0; | |
1758 | } | |
1759 | ||
bd1a5c84 | 1760 | /* Remove an event_call */ |
8169887b | 1761 | int trace_remove_event_call(struct ftrace_event_call *call) |
bd1a5c84 | 1762 | { |
8169887b ON |
1763 | int ret; |
1764 | ||
9713f785 | 1765 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 1766 | mutex_lock(&event_mutex); |
52f6ad6d | 1767 | down_write(&trace_event_sem); |
8169887b | 1768 | ret = probe_remove_event_call(call); |
52f6ad6d | 1769 | up_write(&trace_event_sem); |
bd1a5c84 | 1770 | mutex_unlock(&event_mutex); |
9713f785 | 1771 | mutex_unlock(&trace_types_lock); |
8169887b ON |
1772 | |
1773 | return ret; | |
bd1a5c84 MH |
1774 | } |
1775 | ||
1776 | #define for_each_event(event, start, end) \ | |
1777 | for (event = start; \ | |
1778 | (unsigned long)event < (unsigned long)end; \ | |
1779 | event++) | |
1780 | ||
1781 | #ifdef CONFIG_MODULES | |
1782 | ||
1783 | static LIST_HEAD(ftrace_module_file_list); | |
1784 | ||
1785 | /* | |
1786 | * Modules must own their file_operations to keep up with | |
1787 | * reference counting. | |
1788 | */ | |
1789 | struct ftrace_module_file_ops { | |
1790 | struct list_head list; | |
1791 | struct module *mod; | |
1792 | struct file_operations id; | |
1793 | struct file_operations enable; | |
1794 | struct file_operations format; | |
1795 | struct file_operations filter; | |
1796 | }; | |
1797 | ||
315326c1 SRRH |
1798 | static struct ftrace_module_file_ops * |
1799 | find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod) | |
ae63b31e | 1800 | { |
315326c1 SRRH |
1801 | /* |
1802 | * As event_calls are added in groups by module, | |
1803 | * when we find one file_ops, we don't need to search for | |
1804 | * each call in that module, as the rest should be the | |
1805 | * same. Only search for a new one if the last one did | |
1806 | * not match. | |
1807 | */ | |
1808 | if (file_ops && mod == file_ops->mod) | |
1809 | return file_ops; | |
ae63b31e SR |
1810 | |
1811 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1812 | if (file_ops->mod == mod) | |
1813 | return file_ops; | |
1814 | } | |
1815 | return NULL; | |
1816 | } | |
1817 | ||
701970b3 SR |
1818 | static struct ftrace_module_file_ops * |
1819 | trace_create_file_ops(struct module *mod) | |
1820 | { | |
1821 | struct ftrace_module_file_ops *file_ops; | |
1822 | ||
1823 | /* | |
1824 | * This is a bit of a PITA. To allow for correct reference | |
1825 | * counting, modules must "own" their file_operations. | |
1826 | * To do this, we allocate the file operations that will be | |
1827 | * used in the event directory. | |
1828 | */ | |
1829 | ||
1830 | file_ops = kmalloc(sizeof(*file_ops), GFP_KERNEL); | |
1831 | if (!file_ops) | |
1832 | return NULL; | |
1833 | ||
1834 | file_ops->mod = mod; | |
1835 | ||
1836 | file_ops->id = ftrace_event_id_fops; | |
1837 | file_ops->id.owner = mod; | |
1838 | ||
1839 | file_ops->enable = ftrace_enable_fops; | |
1840 | file_ops->enable.owner = mod; | |
1841 | ||
1842 | file_ops->filter = ftrace_event_filter_fops; | |
1843 | file_ops->filter.owner = mod; | |
1844 | ||
1845 | file_ops->format = ftrace_event_format_fops; | |
1846 | file_ops->format.owner = mod; | |
1847 | ||
1848 | list_add(&file_ops->list, &ftrace_module_file_list); | |
1849 | ||
1850 | return file_ops; | |
1851 | } | |
1852 | ||
6d723736 SR |
1853 | static void trace_module_add_events(struct module *mod) |
1854 | { | |
701970b3 | 1855 | struct ftrace_module_file_ops *file_ops = NULL; |
e4a9ea5e | 1856 | struct ftrace_event_call **call, **start, **end; |
6d723736 | 1857 | |
d6a6d1f3 SRRH |
1858 | if (!mod->num_trace_events) |
1859 | return; | |
1860 | ||
1861 | /* Don't add infrastructure for mods without tracepoints */ | |
1862 | if (trace_module_has_bad_taint(mod)) { | |
1863 | pr_err("%s: module has bad taint, not creating trace events\n", | |
1864 | mod->name); | |
1865 | return; | |
1866 | } | |
1867 | ||
6d723736 SR |
1868 | start = mod->trace_events; |
1869 | end = mod->trace_events + mod->num_trace_events; | |
1870 | ||
1871 | if (start == end) | |
1872 | return; | |
1873 | ||
67ead0a6 LZ |
1874 | file_ops = trace_create_file_ops(mod); |
1875 | if (!file_ops) | |
6d723736 SR |
1876 | return; |
1877 | ||
1878 | for_each_event(call, start, end) { | |
ae63b31e SR |
1879 | __register_event(*call, mod); |
1880 | __add_event_to_tracers(*call, file_ops); | |
6d723736 SR |
1881 | } |
1882 | } | |
1883 | ||
1884 | static void trace_module_remove_events(struct module *mod) | |
1885 | { | |
701970b3 | 1886 | struct ftrace_module_file_ops *file_ops; |
6d723736 | 1887 | struct ftrace_event_call *call, *p; |
575380da | 1888 | bool clear_trace = false; |
6d723736 | 1889 | |
52f6ad6d | 1890 | down_write(&trace_event_sem); |
6d723736 SR |
1891 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1892 | if (call->mod == mod) { | |
575380da SRRH |
1893 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
1894 | clear_trace = true; | |
bd1a5c84 | 1895 | __trace_remove_event_call(call); |
6d723736 SR |
1896 | } |
1897 | } | |
701970b3 SR |
1898 | |
1899 | /* Now free the file_operations */ | |
1900 | list_for_each_entry(file_ops, &ftrace_module_file_list, list) { | |
1901 | if (file_ops->mod == mod) | |
1902 | break; | |
1903 | } | |
1904 | if (&file_ops->list != &ftrace_module_file_list) { | |
1905 | list_del(&file_ops->list); | |
1906 | kfree(file_ops); | |
1907 | } | |
52f6ad6d | 1908 | up_write(&trace_event_sem); |
9456f0fa SR |
1909 | |
1910 | /* | |
1911 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
1912 | * registered any events that were used. The only worry is if |
1913 | * a new module gets loaded, and takes on the same id as the events | |
1914 | * of this module. When printing out the buffer, traced events left | |
1915 | * over from this module may be passed to the new module events and | |
1916 | * unexpected results may occur. | |
9456f0fa | 1917 | */ |
575380da | 1918 | if (clear_trace) |
873c642f | 1919 | tracing_reset_all_online_cpus(); |
6d723736 SR |
1920 | } |
1921 | ||
61f919a1 SR |
1922 | static int trace_module_notify(struct notifier_block *self, |
1923 | unsigned long val, void *data) | |
6d723736 SR |
1924 | { |
1925 | struct module *mod = data; | |
1926 | ||
9713f785 | 1927 | mutex_lock(&trace_types_lock); |
6d723736 SR |
1928 | mutex_lock(&event_mutex); |
1929 | switch (val) { | |
1930 | case MODULE_STATE_COMING: | |
1931 | trace_module_add_events(mod); | |
1932 | break; | |
1933 | case MODULE_STATE_GOING: | |
1934 | trace_module_remove_events(mod); | |
1935 | break; | |
1936 | } | |
1937 | mutex_unlock(&event_mutex); | |
9713f785 | 1938 | mutex_unlock(&trace_types_lock); |
fd994989 | 1939 | |
1473e441 SR |
1940 | return 0; |
1941 | } | |
315326c1 SRRH |
1942 | |
1943 | static int | |
1944 | __trace_add_new_mod_event(struct ftrace_event_call *call, | |
1945 | struct trace_array *tr, | |
1946 | struct ftrace_module_file_ops *file_ops) | |
1947 | { | |
1948 | return __trace_add_new_event(call, tr, | |
1949 | &file_ops->id, &file_ops->enable, | |
1950 | &file_ops->filter, &file_ops->format); | |
1951 | } | |
1952 | ||
61f919a1 | 1953 | #else |
315326c1 SRRH |
1954 | static inline struct ftrace_module_file_ops * |
1955 | find_ftrace_file_ops(struct ftrace_module_file_ops *file_ops, struct module *mod) | |
ae63b31e SR |
1956 | { |
1957 | return NULL; | |
1958 | } | |
315326c1 SRRH |
1959 | static inline int trace_module_notify(struct notifier_block *self, |
1960 | unsigned long val, void *data) | |
61f919a1 SR |
1961 | { |
1962 | return 0; | |
1963 | } | |
315326c1 SRRH |
1964 | static inline int |
1965 | __trace_add_new_mod_event(struct ftrace_event_call *call, | |
1966 | struct trace_array *tr, | |
1967 | struct ftrace_module_file_ops *file_ops) | |
1968 | { | |
1969 | return -ENODEV; | |
1970 | } | |
61f919a1 | 1971 | #endif /* CONFIG_MODULES */ |
1473e441 | 1972 | |
ae63b31e SR |
1973 | /* Create a new event directory structure for a trace directory. */ |
1974 | static void | |
1975 | __trace_add_event_dirs(struct trace_array *tr) | |
1976 | { | |
1977 | struct ftrace_module_file_ops *file_ops = NULL; | |
1978 | struct ftrace_event_call *call; | |
1979 | int ret; | |
1980 | ||
1981 | list_for_each_entry(call, &ftrace_events, list) { | |
1982 | if (call->mod) { | |
1983 | /* | |
1984 | * Directories for events by modules need to | |
1985 | * keep module ref counts when opened (as we don't | |
1986 | * want the module to disappear when reading one | |
1987 | * of these files). The file_ops keep account of | |
1988 | * the module ref count. | |
ae63b31e | 1989 | */ |
315326c1 | 1990 | file_ops = find_ftrace_file_ops(file_ops, call->mod); |
ae63b31e SR |
1991 | if (!file_ops) |
1992 | continue; /* Warn? */ | |
315326c1 | 1993 | ret = __trace_add_new_mod_event(call, tr, file_ops); |
ae63b31e SR |
1994 | if (ret < 0) |
1995 | pr_warning("Could not create directory for event %s\n", | |
1996 | call->name); | |
1997 | continue; | |
1998 | } | |
1999 | ret = __trace_add_new_event(call, tr, | |
2000 | &ftrace_event_id_fops, | |
2001 | &ftrace_enable_fops, | |
2002 | &ftrace_event_filter_fops, | |
2003 | &ftrace_event_format_fops); | |
2004 | if (ret < 0) | |
2005 | pr_warning("Could not create directory for event %s\n", | |
2006 | call->name); | |
2007 | } | |
2008 | } | |
2009 | ||
3cd715de SRRH |
2010 | #ifdef CONFIG_DYNAMIC_FTRACE |
2011 | ||
2012 | /* Avoid typos */ | |
2013 | #define ENABLE_EVENT_STR "enable_event" | |
2014 | #define DISABLE_EVENT_STR "disable_event" | |
2015 | ||
2016 | struct event_probe_data { | |
2017 | struct ftrace_event_file *file; | |
2018 | unsigned long count; | |
2019 | int ref; | |
2020 | bool enable; | |
2021 | }; | |
2022 | ||
2023 | static struct ftrace_event_file * | |
2024 | find_event_file(struct trace_array *tr, const char *system, const char *event) | |
2025 | { | |
2026 | struct ftrace_event_file *file; | |
2027 | struct ftrace_event_call *call; | |
2028 | ||
2029 | list_for_each_entry(file, &tr->events, list) { | |
2030 | ||
2031 | call = file->event_call; | |
2032 | ||
2033 | if (!call->name || !call->class || !call->class->reg) | |
2034 | continue; | |
2035 | ||
2036 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2037 | continue; | |
2038 | ||
2039 | if (strcmp(event, call->name) == 0 && | |
2040 | strcmp(system, call->class->system) == 0) | |
2041 | return file; | |
2042 | } | |
2043 | return NULL; | |
2044 | } | |
2045 | ||
2046 | static void | |
2047 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2048 | { | |
2049 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2050 | struct event_probe_data *data = *pdata; | |
2051 | ||
2052 | if (!data) | |
2053 | return; | |
2054 | ||
2055 | if (data->enable) | |
2056 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2057 | else | |
2058 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2059 | } | |
2060 | ||
2061 | static void | |
2062 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2063 | { | |
2064 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2065 | struct event_probe_data *data = *pdata; | |
2066 | ||
2067 | if (!data) | |
2068 | return; | |
2069 | ||
2070 | if (!data->count) | |
2071 | return; | |
2072 | ||
2073 | /* Skip if the event is in a state we want to switch to */ | |
2074 | if (data->enable == !(data->file->flags & FTRACE_EVENT_FL_SOFT_DISABLED)) | |
2075 | return; | |
2076 | ||
2077 | if (data->count != -1) | |
2078 | (data->count)--; | |
2079 | ||
2080 | event_enable_probe(ip, parent_ip, _data); | |
2081 | } | |
2082 | ||
2083 | static int | |
2084 | event_enable_print(struct seq_file *m, unsigned long ip, | |
2085 | struct ftrace_probe_ops *ops, void *_data) | |
2086 | { | |
2087 | struct event_probe_data *data = _data; | |
2088 | ||
2089 | seq_printf(m, "%ps:", (void *)ip); | |
2090 | ||
2091 | seq_printf(m, "%s:%s:%s", | |
2092 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, | |
2093 | data->file->event_call->class->system, | |
2094 | data->file->event_call->name); | |
2095 | ||
2096 | if (data->count == -1) | |
2097 | seq_printf(m, ":unlimited\n"); | |
2098 | else | |
2099 | seq_printf(m, ":count=%ld\n", data->count); | |
2100 | ||
2101 | return 0; | |
2102 | } | |
2103 | ||
2104 | static int | |
2105 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, | |
2106 | void **_data) | |
2107 | { | |
2108 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2109 | struct event_probe_data *data = *pdata; | |
2110 | ||
2111 | data->ref++; | |
2112 | return 0; | |
2113 | } | |
2114 | ||
2115 | static void | |
2116 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, | |
2117 | void **_data) | |
2118 | { | |
2119 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2120 | struct event_probe_data *data = *pdata; | |
2121 | ||
2122 | if (WARN_ON_ONCE(data->ref <= 0)) | |
2123 | return; | |
2124 | ||
2125 | data->ref--; | |
2126 | if (!data->ref) { | |
2127 | /* Remove the SOFT_MODE flag */ | |
2128 | __ftrace_event_enable_disable(data->file, 0, 1); | |
2129 | module_put(data->file->event_call->mod); | |
2130 | kfree(data); | |
2131 | } | |
2132 | *pdata = NULL; | |
2133 | } | |
2134 | ||
2135 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2136 | .func = event_enable_probe, | |
2137 | .print = event_enable_print, | |
2138 | .init = event_enable_init, | |
2139 | .free = event_enable_free, | |
2140 | }; | |
2141 | ||
2142 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
2143 | .func = event_enable_count_probe, | |
2144 | .print = event_enable_print, | |
2145 | .init = event_enable_init, | |
2146 | .free = event_enable_free, | |
2147 | }; | |
2148 | ||
2149 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
2150 | .func = event_enable_probe, | |
2151 | .print = event_enable_print, | |
2152 | .init = event_enable_init, | |
2153 | .free = event_enable_free, | |
2154 | }; | |
2155 | ||
2156 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2157 | .func = event_enable_count_probe, | |
2158 | .print = event_enable_print, | |
2159 | .init = event_enable_init, | |
2160 | .free = event_enable_free, | |
2161 | }; | |
2162 | ||
2163 | static int | |
2164 | event_enable_func(struct ftrace_hash *hash, | |
2165 | char *glob, char *cmd, char *param, int enabled) | |
2166 | { | |
2167 | struct trace_array *tr = top_trace_array(); | |
2168 | struct ftrace_event_file *file; | |
2169 | struct ftrace_probe_ops *ops; | |
2170 | struct event_probe_data *data; | |
2171 | const char *system; | |
2172 | const char *event; | |
2173 | char *number; | |
2174 | bool enable; | |
2175 | int ret; | |
2176 | ||
2177 | /* hash funcs only work with set_ftrace_filter */ | |
2178 | if (!enabled) | |
2179 | return -EINVAL; | |
2180 | ||
2181 | if (!param) | |
2182 | return -EINVAL; | |
2183 | ||
2184 | system = strsep(¶m, ":"); | |
2185 | if (!param) | |
2186 | return -EINVAL; | |
2187 | ||
2188 | event = strsep(¶m, ":"); | |
2189 | ||
2190 | mutex_lock(&event_mutex); | |
2191 | ||
2192 | ret = -EINVAL; | |
2193 | file = find_event_file(tr, system, event); | |
2194 | if (!file) | |
2195 | goto out; | |
2196 | ||
2197 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2198 | ||
2199 | if (enable) | |
2200 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2201 | else | |
2202 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2203 | ||
2204 | if (glob[0] == '!') { | |
2205 | unregister_ftrace_function_probe_func(glob+1, ops); | |
2206 | ret = 0; | |
2207 | goto out; | |
2208 | } | |
2209 | ||
2210 | ret = -ENOMEM; | |
2211 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2212 | if (!data) | |
2213 | goto out; | |
2214 | ||
2215 | data->enable = enable; | |
2216 | data->count = -1; | |
2217 | data->file = file; | |
2218 | ||
2219 | if (!param) | |
2220 | goto out_reg; | |
2221 | ||
2222 | number = strsep(¶m, ":"); | |
2223 | ||
2224 | ret = -EINVAL; | |
2225 | if (!strlen(number)) | |
2226 | goto out_free; | |
2227 | ||
2228 | /* | |
2229 | * We use the callback data field (which is a pointer) | |
2230 | * as our counter. | |
2231 | */ | |
2232 | ret = kstrtoul(number, 0, &data->count); | |
2233 | if (ret) | |
2234 | goto out_free; | |
2235 | ||
2236 | out_reg: | |
2237 | /* Don't let event modules unload while probe registered */ | |
2238 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2239 | if (!ret) { |
2240 | ret = -EBUSY; | |
3cd715de | 2241 | goto out_free; |
6ed01066 | 2242 | } |
3cd715de SRRH |
2243 | |
2244 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2245 | if (ret < 0) | |
2246 | goto out_put; | |
2247 | ret = register_ftrace_function_probe(glob, ops, data); | |
ff305ded SRRH |
2248 | /* |
2249 | * The above returns on success the # of functions enabled, | |
2250 | * but if it didn't find any functions it returns zero. | |
2251 | * Consider no functions a failure too. | |
2252 | */ | |
a5b85bd1 MH |
2253 | if (!ret) { |
2254 | ret = -ENOENT; | |
3cd715de | 2255 | goto out_disable; |
ff305ded SRRH |
2256 | } else if (ret < 0) |
2257 | goto out_disable; | |
2258 | /* Just return zero, not the number of enabled functions */ | |
2259 | ret = 0; | |
3cd715de SRRH |
2260 | out: |
2261 | mutex_unlock(&event_mutex); | |
2262 | return ret; | |
2263 | ||
2264 | out_disable: | |
2265 | __ftrace_event_enable_disable(file, 0, 1); | |
2266 | out_put: | |
2267 | module_put(file->event_call->mod); | |
2268 | out_free: | |
2269 | kfree(data); | |
2270 | goto out; | |
2271 | } | |
2272 | ||
2273 | static struct ftrace_func_command event_enable_cmd = { | |
2274 | .name = ENABLE_EVENT_STR, | |
2275 | .func = event_enable_func, | |
2276 | }; | |
2277 | ||
2278 | static struct ftrace_func_command event_disable_cmd = { | |
2279 | .name = DISABLE_EVENT_STR, | |
2280 | .func = event_enable_func, | |
2281 | }; | |
2282 | ||
2283 | static __init int register_event_cmds(void) | |
2284 | { | |
2285 | int ret; | |
2286 | ||
2287 | ret = register_ftrace_command(&event_enable_cmd); | |
2288 | if (WARN_ON(ret < 0)) | |
2289 | return ret; | |
2290 | ret = register_ftrace_command(&event_disable_cmd); | |
2291 | if (WARN_ON(ret < 0)) | |
2292 | unregister_ftrace_command(&event_enable_cmd); | |
2293 | return ret; | |
2294 | } | |
2295 | #else | |
2296 | static inline int register_event_cmds(void) { return 0; } | |
2297 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2298 | ||
77248221 SR |
2299 | /* |
2300 | * The top level array has already had its ftrace_event_file | |
2301 | * descriptors created in order to allow for early events to | |
2302 | * be recorded. This function is called after the debugfs has been | |
2303 | * initialized, and we now have to create the files associated | |
2304 | * to the events. | |
2305 | */ | |
2306 | static __init void | |
2307 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2308 | { | |
2309 | struct ftrace_event_file *file; | |
2310 | int ret; | |
2311 | ||
2312 | ||
2313 | list_for_each_entry(file, &tr->events, list) { | |
2314 | ret = event_create_dir(tr->event_dir, file, | |
2315 | &ftrace_event_id_fops, | |
2316 | &ftrace_enable_fops, | |
2317 | &ftrace_event_filter_fops, | |
2318 | &ftrace_event_format_fops); | |
2319 | if (ret < 0) | |
2320 | pr_warning("Could not create directory for event %s\n", | |
2321 | file->event_call->name); | |
2322 | } | |
2323 | } | |
2324 | ||
2325 | /* | |
2326 | * For early boot up, the top trace array requires to have | |
2327 | * a list of events that can be enabled. This must be done before | |
2328 | * the filesystem is set up in order to allow events to be traced | |
2329 | * early. | |
2330 | */ | |
2331 | static __init void | |
2332 | __trace_early_add_events(struct trace_array *tr) | |
2333 | { | |
2334 | struct ftrace_event_call *call; | |
2335 | int ret; | |
2336 | ||
2337 | list_for_each_entry(call, &ftrace_events, list) { | |
2338 | /* Early boot up should not have any modules loaded */ | |
2339 | if (WARN_ON_ONCE(call->mod)) | |
2340 | continue; | |
2341 | ||
2342 | ret = __trace_early_add_new_event(call, tr); | |
2343 | if (ret < 0) | |
2344 | pr_warning("Could not create early event %s\n", | |
2345 | call->name); | |
2346 | } | |
2347 | } | |
2348 | ||
0c8916c3 SR |
2349 | /* Remove the event directory structure for a trace directory. */ |
2350 | static void | |
2351 | __trace_remove_event_dirs(struct trace_array *tr) | |
2352 | { | |
2353 | struct ftrace_event_file *file, *next; | |
2354 | ||
c6febdf2 ON |
2355 | list_for_each_entry_safe(file, next, &tr->events, list) |
2356 | remove_event_file_dir(file); | |
0c8916c3 SR |
2357 | } |
2358 | ||
ae63b31e SR |
2359 | static void |
2360 | __add_event_to_tracers(struct ftrace_event_call *call, | |
2361 | struct ftrace_module_file_ops *file_ops) | |
2362 | { | |
2363 | struct trace_array *tr; | |
2364 | ||
2365 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { | |
2366 | if (file_ops) | |
315326c1 | 2367 | __trace_add_new_mod_event(call, tr, file_ops); |
ae63b31e SR |
2368 | else |
2369 | __trace_add_new_event(call, tr, | |
2370 | &ftrace_event_id_fops, | |
2371 | &ftrace_enable_fops, | |
2372 | &ftrace_event_filter_fops, | |
2373 | &ftrace_event_format_fops); | |
2374 | } | |
2375 | } | |
2376 | ||
ec827c7e | 2377 | static struct notifier_block trace_module_nb = { |
6d723736 SR |
2378 | .notifier_call = trace_module_notify, |
2379 | .priority = 0, | |
2380 | }; | |
2381 | ||
e4a9ea5e SR |
2382 | extern struct ftrace_event_call *__start_ftrace_events[]; |
2383 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2384 | |
020e5f85 LZ |
2385 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2386 | ||
2387 | static __init int setup_trace_event(char *str) | |
2388 | { | |
2389 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2390 | ring_buffer_expanded = true; |
2391 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2392 | |
2393 | return 1; | |
2394 | } | |
2395 | __setup("trace_event=", setup_trace_event); | |
2396 | ||
77248221 SR |
2397 | /* Expects to have event_mutex held when called */ |
2398 | static int | |
2399 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2400 | { |
2401 | struct dentry *d_events; | |
2402 | struct dentry *entry; | |
2403 | ||
2404 | entry = debugfs_create_file("set_event", 0644, parent, | |
2405 | tr, &ftrace_set_event_fops); | |
2406 | if (!entry) { | |
2407 | pr_warning("Could not create debugfs 'set_event' entry\n"); | |
2408 | return -ENOMEM; | |
2409 | } | |
2410 | ||
2411 | d_events = debugfs_create_dir("events", parent); | |
277ba044 | 2412 | if (!d_events) { |
ae63b31e | 2413 | pr_warning("Could not create debugfs 'events' directory\n"); |
277ba044 SR |
2414 | return -ENOMEM; |
2415 | } | |
ae63b31e SR |
2416 | |
2417 | /* ring buffer internal formats */ | |
2418 | trace_create_file("header_page", 0444, d_events, | |
2419 | ring_buffer_print_page_header, | |
2420 | &ftrace_show_header_fops); | |
2421 | ||
2422 | trace_create_file("header_event", 0444, d_events, | |
2423 | ring_buffer_print_entry_header, | |
2424 | &ftrace_show_header_fops); | |
2425 | ||
2426 | trace_create_file("enable", 0644, d_events, | |
2427 | tr, &ftrace_tr_enable_fops); | |
2428 | ||
2429 | tr->event_dir = d_events; | |
77248221 SR |
2430 | |
2431 | return 0; | |
2432 | } | |
2433 | ||
2434 | /** | |
2435 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2436 | * @parent: The parent dentry to place the files/directories for events in | |
2437 | * @tr: The trace array associated with these events | |
2438 | * | |
2439 | * When a new instance is created, it needs to set up its events | |
2440 | * directory, as well as other files associated with events. It also | |
2441 | * creates the event hierachry in the @parent/events directory. | |
2442 | * | |
2443 | * Returns 0 on success. | |
2444 | */ | |
2445 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2446 | { | |
2447 | int ret; | |
2448 | ||
2449 | mutex_lock(&event_mutex); | |
2450 | ||
2451 | ret = create_event_toplevel_files(parent, tr); | |
2452 | if (ret) | |
2453 | goto out_unlock; | |
2454 | ||
52f6ad6d | 2455 | down_write(&trace_event_sem); |
ae63b31e | 2456 | __trace_add_event_dirs(tr); |
52f6ad6d | 2457 | up_write(&trace_event_sem); |
277ba044 | 2458 | |
77248221 | 2459 | out_unlock: |
277ba044 | 2460 | mutex_unlock(&event_mutex); |
ae63b31e | 2461 | |
77248221 SR |
2462 | return ret; |
2463 | } | |
2464 | ||
2465 | /* | |
2466 | * The top trace array already had its file descriptors created. | |
2467 | * Now the files themselves need to be created. | |
2468 | */ | |
2469 | static __init int | |
2470 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2471 | { | |
2472 | int ret; | |
2473 | ||
2474 | mutex_lock(&event_mutex); | |
2475 | ||
2476 | ret = create_event_toplevel_files(parent, tr); | |
2477 | if (ret) | |
2478 | goto out_unlock; | |
2479 | ||
52f6ad6d | 2480 | down_write(&trace_event_sem); |
77248221 | 2481 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 2482 | up_write(&trace_event_sem); |
77248221 SR |
2483 | |
2484 | out_unlock: | |
2485 | mutex_unlock(&event_mutex); | |
2486 | ||
2487 | return ret; | |
ae63b31e SR |
2488 | } |
2489 | ||
0c8916c3 SR |
2490 | int event_trace_del_tracer(struct trace_array *tr) |
2491 | { | |
0c8916c3 SR |
2492 | mutex_lock(&event_mutex); |
2493 | ||
68cebd26 SRRH |
2494 | /* Disable any running events */ |
2495 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
2496 | ||
52f6ad6d | 2497 | down_write(&trace_event_sem); |
0c8916c3 SR |
2498 | __trace_remove_event_dirs(tr); |
2499 | debugfs_remove_recursive(tr->event_dir); | |
52f6ad6d | 2500 | up_write(&trace_event_sem); |
0c8916c3 SR |
2501 | |
2502 | tr->event_dir = NULL; | |
2503 | ||
2504 | mutex_unlock(&event_mutex); | |
2505 | ||
2506 | return 0; | |
2507 | } | |
2508 | ||
d1a29143 SR |
2509 | static __init int event_trace_memsetup(void) |
2510 | { | |
2511 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
2512 | file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC); | |
2513 | return 0; | |
2514 | } | |
2515 | ||
8781915a EG |
2516 | static __init int event_trace_enable(void) |
2517 | { | |
ae63b31e | 2518 | struct trace_array *tr = top_trace_array(); |
8781915a EG |
2519 | struct ftrace_event_call **iter, *call; |
2520 | char *buf = bootup_event_buf; | |
2521 | char *token; | |
2522 | int ret; | |
2523 | ||
2524 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { | |
2525 | ||
2526 | call = *iter; | |
2527 | ret = event_init(call); | |
2528 | if (!ret) | |
2529 | list_add(&call->list, &ftrace_events); | |
2530 | } | |
2531 | ||
77248221 SR |
2532 | /* |
2533 | * We need the top trace array to have a working set of trace | |
2534 | * points at early init, before the debug files and directories | |
2535 | * are created. Create the file entries now, and attach them | |
2536 | * to the actual file dentries later. | |
2537 | */ | |
2538 | __trace_early_add_events(tr); | |
2539 | ||
8781915a EG |
2540 | while (true) { |
2541 | token = strsep(&buf, ","); | |
2542 | ||
2543 | if (!token) | |
2544 | break; | |
2545 | if (!*token) | |
2546 | continue; | |
2547 | ||
ae63b31e | 2548 | ret = ftrace_set_clr_event(tr, token, 1); |
8781915a EG |
2549 | if (ret) |
2550 | pr_warn("Failed to enable trace event: %s\n", token); | |
2551 | } | |
81698831 SR |
2552 | |
2553 | trace_printk_start_comm(); | |
2554 | ||
3cd715de SRRH |
2555 | register_event_cmds(); |
2556 | ||
8781915a EG |
2557 | return 0; |
2558 | } | |
2559 | ||
b77e38aa SR |
2560 | static __init int event_trace_init(void) |
2561 | { | |
ae63b31e | 2562 | struct trace_array *tr; |
b77e38aa SR |
2563 | struct dentry *d_tracer; |
2564 | struct dentry *entry; | |
6d723736 | 2565 | int ret; |
b77e38aa | 2566 | |
ae63b31e SR |
2567 | tr = top_trace_array(); |
2568 | ||
b77e38aa SR |
2569 | d_tracer = tracing_init_dentry(); |
2570 | if (!d_tracer) | |
2571 | return 0; | |
2572 | ||
2314c4ae | 2573 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 2574 | tr, &ftrace_avail_fops); |
2314c4ae SR |
2575 | if (!entry) |
2576 | pr_warning("Could not create debugfs " | |
2577 | "'available_events' entry\n"); | |
2578 | ||
8728fe50 LZ |
2579 | if (trace_define_common_fields()) |
2580 | pr_warning("tracing: Failed to allocate common fields"); | |
2581 | ||
77248221 | 2582 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
2583 | if (ret) |
2584 | return ret; | |
020e5f85 | 2585 | |
6d723736 | 2586 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 2587 | if (ret) |
6d723736 SR |
2588 | pr_warning("Failed to register trace events module notifier\n"); |
2589 | ||
b77e38aa SR |
2590 | return 0; |
2591 | } | |
d1a29143 | 2592 | early_initcall(event_trace_memsetup); |
8781915a | 2593 | core_initcall(event_trace_enable); |
b77e38aa | 2594 | fs_initcall(event_trace_init); |
e6187007 SR |
2595 | |
2596 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
2597 | ||
2598 | static DEFINE_SPINLOCK(test_spinlock); | |
2599 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
2600 | static DEFINE_MUTEX(test_mutex); | |
2601 | ||
2602 | static __init void test_work(struct work_struct *dummy) | |
2603 | { | |
2604 | spin_lock(&test_spinlock); | |
2605 | spin_lock_irq(&test_spinlock_irq); | |
2606 | udelay(1); | |
2607 | spin_unlock_irq(&test_spinlock_irq); | |
2608 | spin_unlock(&test_spinlock); | |
2609 | ||
2610 | mutex_lock(&test_mutex); | |
2611 | msleep(1); | |
2612 | mutex_unlock(&test_mutex); | |
2613 | } | |
2614 | ||
2615 | static __init int event_test_thread(void *unused) | |
2616 | { | |
2617 | void *test_malloc; | |
2618 | ||
2619 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
2620 | if (!test_malloc) | |
2621 | pr_info("failed to kmalloc\n"); | |
2622 | ||
2623 | schedule_on_each_cpu(test_work); | |
2624 | ||
2625 | kfree(test_malloc); | |
2626 | ||
2627 | set_current_state(TASK_INTERRUPTIBLE); | |
2628 | while (!kthread_should_stop()) | |
2629 | schedule(); | |
2630 | ||
2631 | return 0; | |
2632 | } | |
2633 | ||
2634 | /* | |
2635 | * Do various things that may trigger events. | |
2636 | */ | |
2637 | static __init void event_test_stuff(void) | |
2638 | { | |
2639 | struct task_struct *test_thread; | |
2640 | ||
2641 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
2642 | msleep(1); | |
2643 | kthread_stop(test_thread); | |
2644 | } | |
2645 | ||
2646 | /* | |
2647 | * For every trace event defined, we will test each trace point separately, | |
2648 | * and then by groups, and finally all trace points. | |
2649 | */ | |
9ea21c1e | 2650 | static __init void event_trace_self_tests(void) |
e6187007 | 2651 | { |
ae63b31e SR |
2652 | struct ftrace_subsystem_dir *dir; |
2653 | struct ftrace_event_file *file; | |
e6187007 SR |
2654 | struct ftrace_event_call *call; |
2655 | struct event_subsystem *system; | |
ae63b31e | 2656 | struct trace_array *tr; |
e6187007 SR |
2657 | int ret; |
2658 | ||
ae63b31e SR |
2659 | tr = top_trace_array(); |
2660 | ||
e6187007 SR |
2661 | pr_info("Running tests on trace events:\n"); |
2662 | ||
ae63b31e SR |
2663 | list_for_each_entry(file, &tr->events, list) { |
2664 | ||
2665 | call = file->event_call; | |
e6187007 | 2666 | |
2239291a SR |
2667 | /* Only test those that have a probe */ |
2668 | if (!call->class || !call->class->probe) | |
e6187007 SR |
2669 | continue; |
2670 | ||
1f5a6b45 SR |
2671 | /* |
2672 | * Testing syscall events here is pretty useless, but | |
2673 | * we still do it if configured. But this is time consuming. | |
2674 | * What we really need is a user thread to perform the | |
2675 | * syscalls as we test. | |
2676 | */ | |
2677 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
2678 | if (call->class->system && |
2679 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
2680 | continue; |
2681 | #endif | |
2682 | ||
e6187007 SR |
2683 | pr_info("Testing event %s: ", call->name); |
2684 | ||
2685 | /* | |
2686 | * If an event is already enabled, someone is using | |
2687 | * it and the self test should not be on. | |
2688 | */ | |
ae63b31e | 2689 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
e6187007 SR |
2690 | pr_warning("Enabled event during self test!\n"); |
2691 | WARN_ON_ONCE(1); | |
2692 | continue; | |
2693 | } | |
2694 | ||
ae63b31e | 2695 | ftrace_event_enable_disable(file, 1); |
e6187007 | 2696 | event_test_stuff(); |
ae63b31e | 2697 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
2698 | |
2699 | pr_cont("OK\n"); | |
2700 | } | |
2701 | ||
2702 | /* Now test at the sub system level */ | |
2703 | ||
2704 | pr_info("Running tests on trace event systems:\n"); | |
2705 | ||
ae63b31e SR |
2706 | list_for_each_entry(dir, &tr->systems, list) { |
2707 | ||
2708 | system = dir->subsystem; | |
e6187007 SR |
2709 | |
2710 | /* the ftrace system is special, skip it */ | |
2711 | if (strcmp(system->name, "ftrace") == 0) | |
2712 | continue; | |
2713 | ||
2714 | pr_info("Testing event system %s: ", system->name); | |
2715 | ||
ae63b31e | 2716 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 SR |
2717 | if (WARN_ON_ONCE(ret)) { |
2718 | pr_warning("error enabling system %s\n", | |
2719 | system->name); | |
2720 | continue; | |
2721 | } | |
2722 | ||
2723 | event_test_stuff(); | |
2724 | ||
ae63b31e | 2725 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 2726 | if (WARN_ON_ONCE(ret)) { |
e6187007 SR |
2727 | pr_warning("error disabling system %s\n", |
2728 | system->name); | |
76bab1b7 YL |
2729 | continue; |
2730 | } | |
e6187007 SR |
2731 | |
2732 | pr_cont("OK\n"); | |
2733 | } | |
2734 | ||
2735 | /* Test with all events enabled */ | |
2736 | ||
2737 | pr_info("Running tests on all trace events:\n"); | |
2738 | pr_info("Testing all events: "); | |
2739 | ||
ae63b31e | 2740 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 2741 | if (WARN_ON_ONCE(ret)) { |
e6187007 | 2742 | pr_warning("error enabling all events\n"); |
9ea21c1e | 2743 | return; |
e6187007 SR |
2744 | } |
2745 | ||
2746 | event_test_stuff(); | |
2747 | ||
2748 | /* reset sysname */ | |
ae63b31e | 2749 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 SR |
2750 | if (WARN_ON_ONCE(ret)) { |
2751 | pr_warning("error disabling all events\n"); | |
9ea21c1e | 2752 | return; |
e6187007 SR |
2753 | } |
2754 | ||
2755 | pr_cont("OK\n"); | |
9ea21c1e SR |
2756 | } |
2757 | ||
2758 | #ifdef CONFIG_FUNCTION_TRACER | |
2759 | ||
245b2e70 | 2760 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
2761 | |
2762 | static void | |
2f5f6ad9 | 2763 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 2764 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
2765 | { |
2766 | struct ring_buffer_event *event; | |
e77405ad | 2767 | struct ring_buffer *buffer; |
9ea21c1e SR |
2768 | struct ftrace_entry *entry; |
2769 | unsigned long flags; | |
2770 | long disabled; | |
9ea21c1e SR |
2771 | int cpu; |
2772 | int pc; | |
2773 | ||
2774 | pc = preempt_count(); | |
5168ae50 | 2775 | preempt_disable_notrace(); |
9ea21c1e | 2776 | cpu = raw_smp_processor_id(); |
245b2e70 | 2777 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
2778 | |
2779 | if (disabled != 1) | |
2780 | goto out; | |
2781 | ||
2782 | local_save_flags(flags); | |
2783 | ||
e77405ad SR |
2784 | event = trace_current_buffer_lock_reserve(&buffer, |
2785 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
2786 | flags, pc); |
2787 | if (!event) | |
2788 | goto out; | |
2789 | entry = ring_buffer_event_data(event); | |
2790 | entry->ip = ip; | |
2791 | entry->parent_ip = parent_ip; | |
2792 | ||
0d5c6e1c | 2793 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
2794 | |
2795 | out: | |
245b2e70 | 2796 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 2797 | preempt_enable_notrace(); |
9ea21c1e SR |
2798 | } |
2799 | ||
2800 | static struct ftrace_ops trace_ops __initdata = | |
2801 | { | |
2802 | .func = function_test_events_call, | |
4740974a | 2803 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
2804 | }; |
2805 | ||
2806 | static __init void event_trace_self_test_with_function(void) | |
2807 | { | |
17bb615a SR |
2808 | int ret; |
2809 | ret = register_ftrace_function(&trace_ops); | |
2810 | if (WARN_ON(ret < 0)) { | |
2811 | pr_info("Failed to enable function tracer for event tests\n"); | |
2812 | return; | |
2813 | } | |
9ea21c1e SR |
2814 | pr_info("Running tests again, along with the function tracer\n"); |
2815 | event_trace_self_tests(); | |
2816 | unregister_ftrace_function(&trace_ops); | |
2817 | } | |
2818 | #else | |
2819 | static __init void event_trace_self_test_with_function(void) | |
2820 | { | |
2821 | } | |
2822 | #endif | |
2823 | ||
2824 | static __init int event_trace_self_tests_init(void) | |
2825 | { | |
020e5f85 LZ |
2826 | if (!tracing_selftest_disabled) { |
2827 | event_trace_self_tests(); | |
2828 | event_trace_self_test_with_function(); | |
2829 | } | |
e6187007 SR |
2830 | |
2831 | return 0; | |
2832 | } | |
2833 | ||
28d20e2d | 2834 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
2835 | |
2836 | #endif |