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 | ||
3448bac3 FF |
11 | #define pr_fmt(fmt) fmt |
12 | ||
e6187007 SR |
13 | #include <linux/workqueue.h> |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/kthread.h> | |
b77e38aa SR |
16 | #include <linux/debugfs.h> |
17 | #include <linux/uaccess.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/ctype.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
e6187007 | 21 | #include <linux/delay.h> |
b77e38aa | 22 | |
020e5f85 LZ |
23 | #include <asm/setup.h> |
24 | ||
91729ef9 | 25 | #include "trace_output.h" |
b77e38aa | 26 | |
4e5292ea | 27 | #undef TRACE_SYSTEM |
b628b3e6 SR |
28 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
29 | ||
20c8928a | 30 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 31 | |
a59fd602 | 32 | LIST_HEAD(ftrace_events); |
b3a8c6fd | 33 | static LIST_HEAD(ftrace_common_fields); |
a59fd602 | 34 | |
d1a29143 SR |
35 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
36 | ||
37 | static struct kmem_cache *field_cachep; | |
38 | static struct kmem_cache *file_cachep; | |
39 | ||
6e94a780 SR |
40 | #define SYSTEM_FL_FREE_NAME (1 << 31) |
41 | ||
42 | static inline int system_refcount(struct event_subsystem *system) | |
43 | { | |
44 | return system->ref_count & ~SYSTEM_FL_FREE_NAME; | |
45 | } | |
46 | ||
47 | static int system_refcount_inc(struct event_subsystem *system) | |
48 | { | |
49 | return (system->ref_count++) & ~SYSTEM_FL_FREE_NAME; | |
50 | } | |
51 | ||
52 | static int system_refcount_dec(struct event_subsystem *system) | |
53 | { | |
54 | return (--system->ref_count) & ~SYSTEM_FL_FREE_NAME; | |
55 | } | |
56 | ||
ae63b31e SR |
57 | /* Double loops, do not use break, only goto's work */ |
58 | #define do_for_each_event_file(tr, file) \ | |
59 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
60 | list_for_each_entry(file, &tr->events, list) | |
61 | ||
62 | #define do_for_each_event_file_safe(tr, file) \ | |
63 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
64 | struct ftrace_event_file *___n; \ | |
65 | list_for_each_entry_safe(file, ___n, &tr->events, list) | |
66 | ||
67 | #define while_for_each_event_file() \ | |
68 | } | |
69 | ||
b3a8c6fd | 70 | static struct list_head * |
2e33af02 SR |
71 | trace_get_fields(struct ftrace_event_call *event_call) |
72 | { | |
73 | if (!event_call->class->get_fields) | |
74 | return &event_call->class->fields; | |
75 | return event_call->class->get_fields(event_call); | |
76 | } | |
77 | ||
b3a8c6fd J |
78 | static struct ftrace_event_field * |
79 | __find_event_field(struct list_head *head, char *name) | |
80 | { | |
81 | struct ftrace_event_field *field; | |
82 | ||
83 | list_for_each_entry(field, head, link) { | |
84 | if (!strcmp(field->name, name)) | |
85 | return field; | |
86 | } | |
87 | ||
88 | return NULL; | |
89 | } | |
90 | ||
91 | struct ftrace_event_field * | |
92 | trace_find_event_field(struct ftrace_event_call *call, char *name) | |
93 | { | |
94 | struct ftrace_event_field *field; | |
95 | struct list_head *head; | |
96 | ||
97 | field = __find_event_field(&ftrace_common_fields, name); | |
98 | if (field) | |
99 | return field; | |
100 | ||
101 | head = trace_get_fields(call); | |
102 | return __find_event_field(head, name); | |
103 | } | |
104 | ||
8728fe50 LZ |
105 | static int __trace_define_field(struct list_head *head, const char *type, |
106 | const char *name, int offset, int size, | |
107 | int is_signed, int filter_type) | |
cf027f64 TZ |
108 | { |
109 | struct ftrace_event_field *field; | |
110 | ||
d1a29143 | 111 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 112 | if (!field) |
aaf6ac0f | 113 | return -ENOMEM; |
fe9f57f2 | 114 | |
92edca07 SR |
115 | field->name = name; |
116 | field->type = type; | |
fe9f57f2 | 117 | |
43b51ead LZ |
118 | if (filter_type == FILTER_OTHER) |
119 | field->filter_type = filter_assign_type(type); | |
120 | else | |
121 | field->filter_type = filter_type; | |
122 | ||
cf027f64 TZ |
123 | field->offset = offset; |
124 | field->size = size; | |
a118e4d1 | 125 | field->is_signed = is_signed; |
aa38e9fc | 126 | |
2e33af02 | 127 | list_add(&field->link, head); |
cf027f64 TZ |
128 | |
129 | return 0; | |
cf027f64 | 130 | } |
8728fe50 LZ |
131 | |
132 | int trace_define_field(struct ftrace_event_call *call, const char *type, | |
133 | const char *name, int offset, int size, int is_signed, | |
134 | int filter_type) | |
135 | { | |
136 | struct list_head *head; | |
137 | ||
138 | if (WARN_ON(!call->class)) | |
139 | return 0; | |
140 | ||
141 | head = trace_get_fields(call); | |
142 | return __trace_define_field(head, type, name, offset, size, | |
143 | is_signed, filter_type); | |
144 | } | |
17c873ec | 145 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 146 | |
e647d6b3 | 147 | #define __common_field(type, item) \ |
8728fe50 LZ |
148 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
149 | "common_" #item, \ | |
150 | offsetof(typeof(ent), item), \ | |
151 | sizeof(ent.item), \ | |
152 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
153 | if (ret) \ |
154 | return ret; | |
155 | ||
8728fe50 | 156 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
157 | { |
158 | int ret; | |
159 | struct trace_entry ent; | |
160 | ||
161 | __common_field(unsigned short, type); | |
162 | __common_field(unsigned char, flags); | |
163 | __common_field(unsigned char, preempt_count); | |
164 | __common_field(int, pid); | |
e647d6b3 LZ |
165 | |
166 | return ret; | |
167 | } | |
168 | ||
ad7067ce | 169 | static void trace_destroy_fields(struct ftrace_event_call *call) |
2df75e41 LZ |
170 | { |
171 | struct ftrace_event_field *field, *next; | |
2e33af02 | 172 | struct list_head *head; |
2df75e41 | 173 | |
2e33af02 SR |
174 | head = trace_get_fields(call); |
175 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 176 | list_del(&field->link); |
d1a29143 | 177 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
178 | } |
179 | } | |
180 | ||
87d9b4e1 LZ |
181 | int trace_event_raw_init(struct ftrace_event_call *call) |
182 | { | |
183 | int id; | |
184 | ||
80decc70 | 185 | id = register_ftrace_event(&call->event); |
87d9b4e1 LZ |
186 | if (!id) |
187 | return -ENODEV; | |
87d9b4e1 LZ |
188 | |
189 | return 0; | |
190 | } | |
191 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
192 | ||
3fd40d1e SR |
193 | void *ftrace_event_buffer_reserve(struct ftrace_event_buffer *fbuffer, |
194 | struct ftrace_event_file *ftrace_file, | |
195 | unsigned long len) | |
196 | { | |
197 | struct ftrace_event_call *event_call = ftrace_file->event_call; | |
198 | ||
199 | local_save_flags(fbuffer->flags); | |
200 | fbuffer->pc = preempt_count(); | |
201 | fbuffer->ftrace_file = ftrace_file; | |
202 | ||
203 | fbuffer->event = | |
204 | trace_event_buffer_lock_reserve(&fbuffer->buffer, ftrace_file, | |
205 | event_call->event.type, len, | |
206 | fbuffer->flags, fbuffer->pc); | |
207 | if (!fbuffer->event) | |
208 | return NULL; | |
209 | ||
210 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); | |
211 | return fbuffer->entry; | |
212 | } | |
213 | EXPORT_SYMBOL_GPL(ftrace_event_buffer_reserve); | |
214 | ||
0daa2302 SRRH |
215 | static DEFINE_SPINLOCK(tracepoint_iter_lock); |
216 | ||
217 | static void output_printk(struct ftrace_event_buffer *fbuffer) | |
218 | { | |
219 | struct ftrace_event_call *event_call; | |
220 | struct trace_event *event; | |
221 | unsigned long flags; | |
222 | struct trace_iterator *iter = tracepoint_print_iter; | |
223 | ||
224 | if (!iter) | |
225 | return; | |
226 | ||
227 | event_call = fbuffer->ftrace_file->event_call; | |
228 | if (!event_call || !event_call->event.funcs || | |
229 | !event_call->event.funcs->trace) | |
230 | return; | |
231 | ||
232 | event = &fbuffer->ftrace_file->event_call->event; | |
233 | ||
234 | spin_lock_irqsave(&tracepoint_iter_lock, flags); | |
235 | trace_seq_init(&iter->seq); | |
236 | iter->ent = fbuffer->entry; | |
237 | event_call->event.funcs->trace(iter, 0, event); | |
238 | trace_seq_putc(&iter->seq, 0); | |
239 | printk("%s", iter->seq.buffer); | |
240 | ||
241 | spin_unlock_irqrestore(&tracepoint_iter_lock, flags); | |
242 | } | |
243 | ||
3fd40d1e SR |
244 | void ftrace_event_buffer_commit(struct ftrace_event_buffer *fbuffer) |
245 | { | |
0daa2302 SRRH |
246 | if (tracepoint_printk) |
247 | output_printk(fbuffer); | |
248 | ||
3fd40d1e SR |
249 | event_trigger_unlock_commit(fbuffer->ftrace_file, fbuffer->buffer, |
250 | fbuffer->event, fbuffer->entry, | |
251 | fbuffer->flags, fbuffer->pc); | |
252 | } | |
253 | EXPORT_SYMBOL_GPL(ftrace_event_buffer_commit); | |
254 | ||
ceec0b6f JO |
255 | int ftrace_event_reg(struct ftrace_event_call *call, |
256 | enum trace_reg type, void *data) | |
a1d0ce82 | 257 | { |
ae63b31e SR |
258 | struct ftrace_event_file *file = data; |
259 | ||
de7b2973 | 260 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
a1d0ce82 SR |
261 | switch (type) { |
262 | case TRACE_REG_REGISTER: | |
de7b2973 | 263 | return tracepoint_probe_register(call->tp, |
a1d0ce82 | 264 | call->class->probe, |
ae63b31e | 265 | file); |
a1d0ce82 | 266 | case TRACE_REG_UNREGISTER: |
de7b2973 | 267 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 | 268 | call->class->probe, |
ae63b31e | 269 | file); |
a1d0ce82 SR |
270 | return 0; |
271 | ||
272 | #ifdef CONFIG_PERF_EVENTS | |
273 | case TRACE_REG_PERF_REGISTER: | |
de7b2973 | 274 | return tracepoint_probe_register(call->tp, |
a1d0ce82 SR |
275 | call->class->perf_probe, |
276 | call); | |
277 | case TRACE_REG_PERF_UNREGISTER: | |
de7b2973 | 278 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 SR |
279 | call->class->perf_probe, |
280 | call); | |
281 | return 0; | |
ceec0b6f JO |
282 | case TRACE_REG_PERF_OPEN: |
283 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
284 | case TRACE_REG_PERF_ADD: |
285 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 286 | return 0; |
a1d0ce82 SR |
287 | #endif |
288 | } | |
289 | return 0; | |
290 | } | |
291 | EXPORT_SYMBOL_GPL(ftrace_event_reg); | |
292 | ||
e870e9a1 LZ |
293 | void trace_event_enable_cmd_record(bool enable) |
294 | { | |
ae63b31e SR |
295 | struct ftrace_event_file *file; |
296 | struct trace_array *tr; | |
e870e9a1 LZ |
297 | |
298 | mutex_lock(&event_mutex); | |
ae63b31e SR |
299 | do_for_each_event_file(tr, file) { |
300 | ||
301 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) | |
e870e9a1 LZ |
302 | continue; |
303 | ||
304 | if (enable) { | |
305 | tracing_start_cmdline_record(); | |
417944c4 | 306 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
307 | } else { |
308 | tracing_stop_cmdline_record(); | |
417944c4 | 309 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 310 | } |
ae63b31e | 311 | } while_for_each_event_file(); |
e870e9a1 LZ |
312 | mutex_unlock(&event_mutex); |
313 | } | |
314 | ||
417944c4 SRRH |
315 | static int __ftrace_event_enable_disable(struct ftrace_event_file *file, |
316 | int enable, int soft_disable) | |
fd994989 | 317 | { |
ae63b31e | 318 | struct ftrace_event_call *call = file->event_call; |
3b8e4273 | 319 | int ret = 0; |
417944c4 | 320 | int disable; |
3b8e4273 | 321 | |
fd994989 SR |
322 | switch (enable) { |
323 | case 0: | |
417944c4 | 324 | /* |
1cf4c073 MH |
325 | * When soft_disable is set and enable is cleared, the sm_ref |
326 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
327 | * to clear the SOFT_DISABLED flag but leave the event in the |
328 | * state that it was. That is, if the event was enabled and | |
329 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
330 | * is set we do not want the event to be enabled before we | |
331 | * clear the bit. | |
332 | * | |
333 | * When soft_disable is not set but the SOFT_MODE flag is, | |
334 | * we do nothing. Do not disable the tracepoint, otherwise | |
335 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
336 | */ | |
337 | if (soft_disable) { | |
1cf4c073 MH |
338 | if (atomic_dec_return(&file->sm_ref) > 0) |
339 | break; | |
417944c4 SRRH |
340 | disable = file->flags & FTRACE_EVENT_FL_SOFT_DISABLED; |
341 | clear_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); | |
342 | } else | |
343 | disable = !(file->flags & FTRACE_EVENT_FL_SOFT_MODE); | |
344 | ||
345 | if (disable && (file->flags & FTRACE_EVENT_FL_ENABLED)) { | |
346 | clear_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); | |
ae63b31e | 347 | if (file->flags & FTRACE_EVENT_FL_RECORDED_CMD) { |
e870e9a1 | 348 | tracing_stop_cmdline_record(); |
417944c4 | 349 | clear_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 350 | } |
ae63b31e | 351 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 352 | } |
3baa5e4c | 353 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
417944c4 SRRH |
354 | if (file->flags & FTRACE_EVENT_FL_SOFT_MODE) |
355 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c TZ |
356 | else |
357 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
fd994989 SR |
358 | break; |
359 | case 1: | |
417944c4 SRRH |
360 | /* |
361 | * When soft_disable is set and enable is set, we want to | |
362 | * register the tracepoint for the event, but leave the event | |
363 | * as is. That means, if the event was already enabled, we do | |
364 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
365 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
366 | * it still seems to be disabled. | |
367 | */ | |
368 | if (!soft_disable) | |
369 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
1cf4c073 MH |
370 | else { |
371 | if (atomic_inc_return(&file->sm_ref) > 1) | |
372 | break; | |
417944c4 | 373 | set_bit(FTRACE_EVENT_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 374 | } |
417944c4 | 375 | |
ae63b31e | 376 | if (!(file->flags & FTRACE_EVENT_FL_ENABLED)) { |
417944c4 SRRH |
377 | |
378 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
379 | if (soft_disable) | |
380 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags); | |
381 | ||
e870e9a1 LZ |
382 | if (trace_flags & TRACE_ITER_RECORD_CMD) { |
383 | tracing_start_cmdline_record(); | |
417944c4 | 384 | set_bit(FTRACE_EVENT_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 385 | } |
ae63b31e | 386 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
387 | if (ret) { |
388 | tracing_stop_cmdline_record(); | |
389 | pr_info("event trace: Could not enable event " | |
de7b2973 | 390 | "%s\n", ftrace_event_name(call)); |
3b8e4273 LZ |
391 | break; |
392 | } | |
417944c4 | 393 | set_bit(FTRACE_EVENT_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
394 | |
395 | /* WAS_ENABLED gets set but never cleared. */ | |
396 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; | |
fd994989 | 397 | } |
fd994989 SR |
398 | break; |
399 | } | |
3b8e4273 LZ |
400 | |
401 | return ret; | |
fd994989 SR |
402 | } |
403 | ||
85f2b082 TZ |
404 | int trace_event_enable_disable(struct ftrace_event_file *file, |
405 | int enable, int soft_disable) | |
406 | { | |
407 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
408 | } | |
409 | ||
417944c4 SRRH |
410 | static int ftrace_event_enable_disable(struct ftrace_event_file *file, |
411 | int enable) | |
412 | { | |
413 | return __ftrace_event_enable_disable(file, enable, 0); | |
414 | } | |
415 | ||
ae63b31e | 416 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 417 | { |
ae63b31e | 418 | struct ftrace_event_file *file; |
0e907c99 Z |
419 | |
420 | mutex_lock(&event_mutex); | |
ae63b31e SR |
421 | list_for_each_entry(file, &tr->events, list) { |
422 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
423 | } |
424 | mutex_unlock(&event_mutex); | |
425 | } | |
426 | ||
e9dbfae5 SR |
427 | static void __put_system(struct event_subsystem *system) |
428 | { | |
429 | struct event_filter *filter = system->filter; | |
430 | ||
6e94a780 SR |
431 | WARN_ON_ONCE(system_refcount(system) == 0); |
432 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
433 | return; |
434 | ||
ae63b31e SR |
435 | list_del(&system->list); |
436 | ||
e9dbfae5 SR |
437 | if (filter) { |
438 | kfree(filter->filter_string); | |
439 | kfree(filter); | |
440 | } | |
6e94a780 SR |
441 | if (system->ref_count & SYSTEM_FL_FREE_NAME) |
442 | kfree(system->name); | |
e9dbfae5 SR |
443 | kfree(system); |
444 | } | |
445 | ||
446 | static void __get_system(struct event_subsystem *system) | |
447 | { | |
6e94a780 SR |
448 | WARN_ON_ONCE(system_refcount(system) == 0); |
449 | system_refcount_inc(system); | |
e9dbfae5 SR |
450 | } |
451 | ||
ae63b31e SR |
452 | static void __get_system_dir(struct ftrace_subsystem_dir *dir) |
453 | { | |
454 | WARN_ON_ONCE(dir->ref_count == 0); | |
455 | dir->ref_count++; | |
456 | __get_system(dir->subsystem); | |
457 | } | |
458 | ||
459 | static void __put_system_dir(struct ftrace_subsystem_dir *dir) | |
460 | { | |
461 | WARN_ON_ONCE(dir->ref_count == 0); | |
462 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 463 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
464 | |
465 | __put_system(dir->subsystem); | |
466 | if (!--dir->ref_count) | |
467 | kfree(dir); | |
468 | } | |
469 | ||
470 | static void put_system(struct ftrace_subsystem_dir *dir) | |
e9dbfae5 SR |
471 | { |
472 | mutex_lock(&event_mutex); | |
ae63b31e | 473 | __put_system_dir(dir); |
e9dbfae5 SR |
474 | mutex_unlock(&event_mutex); |
475 | } | |
476 | ||
f6a84bdc ON |
477 | static void remove_subsystem(struct ftrace_subsystem_dir *dir) |
478 | { | |
479 | if (!dir) | |
480 | return; | |
481 | ||
482 | if (!--dir->nr_events) { | |
483 | debugfs_remove_recursive(dir->entry); | |
484 | list_del(&dir->list); | |
485 | __put_system_dir(dir); | |
486 | } | |
487 | } | |
488 | ||
f6a84bdc ON |
489 | static void remove_event_file_dir(struct ftrace_event_file *file) |
490 | { | |
bf682c31 ON |
491 | struct dentry *dir = file->dir; |
492 | struct dentry *child; | |
493 | ||
494 | if (dir) { | |
495 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
946e51f2 | 496 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
bf682c31 ON |
497 | if (child->d_inode) /* probably unneeded */ |
498 | child->d_inode->i_private = NULL; | |
499 | } | |
500 | spin_unlock(&dir->d_lock); | |
501 | ||
502 | debugfs_remove_recursive(dir); | |
503 | } | |
504 | ||
f6a84bdc | 505 | list_del(&file->list); |
f6a84bdc | 506 | remove_subsystem(file->system); |
2448e349 | 507 | free_event_filter(file->filter); |
f6a84bdc ON |
508 | kmem_cache_free(file_cachep, file); |
509 | } | |
510 | ||
8f31bfe5 LZ |
511 | /* |
512 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
513 | */ | |
2a6c24af SRRH |
514 | static int |
515 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
516 | const char *sub, const char *event, int set) | |
b77e38aa | 517 | { |
ae63b31e | 518 | struct ftrace_event_file *file; |
a59fd602 | 519 | struct ftrace_event_call *call; |
de7b2973 | 520 | const char *name; |
29f93943 | 521 | int ret = -EINVAL; |
8f31bfe5 | 522 | |
ae63b31e SR |
523 | list_for_each_entry(file, &tr->events, list) { |
524 | ||
525 | call = file->event_call; | |
de7b2973 | 526 | name = ftrace_event_name(call); |
8f31bfe5 | 527 | |
de7b2973 | 528 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
529 | continue; |
530 | ||
9b63776f SR |
531 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
532 | continue; | |
533 | ||
8f31bfe5 | 534 | if (match && |
de7b2973 | 535 | strcmp(match, name) != 0 && |
8f082018 | 536 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
537 | continue; |
538 | ||
8f082018 | 539 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
540 | continue; |
541 | ||
de7b2973 | 542 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
543 | continue; |
544 | ||
ae63b31e | 545 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
546 | |
547 | ret = 0; | |
548 | } | |
2a6c24af SRRH |
549 | |
550 | return ret; | |
551 | } | |
552 | ||
553 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
554 | const char *sub, const char *event, int set) | |
555 | { | |
556 | int ret; | |
557 | ||
558 | mutex_lock(&event_mutex); | |
559 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
560 | mutex_unlock(&event_mutex); |
561 | ||
562 | return ret; | |
563 | } | |
564 | ||
ae63b31e | 565 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 566 | { |
b628b3e6 | 567 | char *event = NULL, *sub = NULL, *match; |
b628b3e6 SR |
568 | |
569 | /* | |
570 | * The buf format can be <subsystem>:<event-name> | |
571 | * *:<event-name> means any event by that name. | |
572 | * :<event-name> is the same. | |
573 | * | |
574 | * <subsystem>:* means all events in that subsystem | |
575 | * <subsystem>: means the same. | |
576 | * | |
577 | * <name> (no ':') means all events in a subsystem with | |
578 | * the name <name> or any event that matches <name> | |
579 | */ | |
580 | ||
581 | match = strsep(&buf, ":"); | |
582 | if (buf) { | |
583 | sub = match; | |
584 | event = buf; | |
585 | match = NULL; | |
586 | ||
587 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
588 | sub = NULL; | |
589 | if (!strlen(event) || strcmp(event, "*") == 0) | |
590 | event = NULL; | |
591 | } | |
b77e38aa | 592 | |
ae63b31e | 593 | return __ftrace_set_clr_event(tr, match, sub, event, set); |
b77e38aa SR |
594 | } |
595 | ||
4671c794 SR |
596 | /** |
597 | * trace_set_clr_event - enable or disable an event | |
598 | * @system: system name to match (NULL for any system) | |
599 | * @event: event name to match (NULL for all events, within system) | |
600 | * @set: 1 to enable, 0 to disable | |
601 | * | |
602 | * This is a way for other parts of the kernel to enable or disable | |
603 | * event recording. | |
604 | * | |
605 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
606 | * registered events. | |
607 | */ | |
608 | int trace_set_clr_event(const char *system, const char *event, int set) | |
609 | { | |
ae63b31e SR |
610 | struct trace_array *tr = top_trace_array(); |
611 | ||
dc81e5e3 YY |
612 | if (!tr) |
613 | return -ENODEV; | |
614 | ||
ae63b31e | 615 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 616 | } |
56355b83 | 617 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 618 | |
b77e38aa SR |
619 | /* 128 should be much more than enough */ |
620 | #define EVENT_BUF_SIZE 127 | |
621 | ||
622 | static ssize_t | |
623 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
624 | size_t cnt, loff_t *ppos) | |
625 | { | |
48966364 | 626 | struct trace_parser parser; |
ae63b31e SR |
627 | struct seq_file *m = file->private_data; |
628 | struct trace_array *tr = m->private; | |
4ba7978e | 629 | ssize_t read, ret; |
b77e38aa | 630 | |
4ba7978e | 631 | if (!cnt) |
b77e38aa SR |
632 | return 0; |
633 | ||
1852fcce SR |
634 | ret = tracing_update_buffers(); |
635 | if (ret < 0) | |
636 | return ret; | |
637 | ||
48966364 | 638 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
639 | return -ENOMEM; |
640 | ||
48966364 | 641 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
642 | ||
4ba7978e | 643 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 644 | int set = 1; |
b77e38aa | 645 | |
48966364 | 646 | if (*parser.buffer == '!') |
b77e38aa | 647 | set = 0; |
b77e38aa | 648 | |
48966364 | 649 | parser.buffer[parser.idx] = 0; |
650 | ||
ae63b31e | 651 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 652 | if (ret) |
48966364 | 653 | goto out_put; |
b77e38aa | 654 | } |
b77e38aa SR |
655 | |
656 | ret = read; | |
657 | ||
48966364 | 658 | out_put: |
659 | trace_parser_put(&parser); | |
b77e38aa SR |
660 | |
661 | return ret; | |
662 | } | |
663 | ||
664 | static void * | |
665 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
666 | { | |
ae63b31e SR |
667 | struct ftrace_event_file *file = v; |
668 | struct ftrace_event_call *call; | |
669 | struct trace_array *tr = m->private; | |
b77e38aa SR |
670 | |
671 | (*pos)++; | |
672 | ||
ae63b31e SR |
673 | list_for_each_entry_continue(file, &tr->events, list) { |
674 | call = file->event_call; | |
40e26815 SR |
675 | /* |
676 | * The ftrace subsystem is for showing formats only. | |
677 | * They can not be enabled or disabled via the event files. | |
678 | */ | |
a1d0ce82 | 679 | if (call->class && call->class->reg) |
ae63b31e | 680 | return file; |
40e26815 | 681 | } |
b77e38aa | 682 | |
30bd39cd | 683 | return NULL; |
b77e38aa SR |
684 | } |
685 | ||
686 | static void *t_start(struct seq_file *m, loff_t *pos) | |
687 | { | |
ae63b31e SR |
688 | struct ftrace_event_file *file; |
689 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
690 | loff_t l; |
691 | ||
20c8928a | 692 | mutex_lock(&event_mutex); |
e1c7e2a6 | 693 | |
ae63b31e | 694 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 695 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
696 | file = t_next(m, file, &l); |
697 | if (!file) | |
e1c7e2a6 LZ |
698 | break; |
699 | } | |
ae63b31e | 700 | return file; |
b77e38aa SR |
701 | } |
702 | ||
703 | static void * | |
704 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
705 | { | |
ae63b31e SR |
706 | struct ftrace_event_file *file = v; |
707 | struct trace_array *tr = m->private; | |
b77e38aa SR |
708 | |
709 | (*pos)++; | |
710 | ||
ae63b31e SR |
711 | list_for_each_entry_continue(file, &tr->events, list) { |
712 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
713 | return file; | |
b77e38aa SR |
714 | } |
715 | ||
30bd39cd | 716 | return NULL; |
b77e38aa SR |
717 | } |
718 | ||
719 | static void *s_start(struct seq_file *m, loff_t *pos) | |
720 | { | |
ae63b31e SR |
721 | struct ftrace_event_file *file; |
722 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
723 | loff_t l; |
724 | ||
20c8928a | 725 | mutex_lock(&event_mutex); |
e1c7e2a6 | 726 | |
ae63b31e | 727 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 728 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
729 | file = s_next(m, file, &l); |
730 | if (!file) | |
e1c7e2a6 LZ |
731 | break; |
732 | } | |
ae63b31e | 733 | return file; |
b77e38aa SR |
734 | } |
735 | ||
736 | static int t_show(struct seq_file *m, void *v) | |
737 | { | |
ae63b31e SR |
738 | struct ftrace_event_file *file = v; |
739 | struct ftrace_event_call *call = file->event_call; | |
b77e38aa | 740 | |
8f082018 SR |
741 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
742 | seq_printf(m, "%s:", call->class->system); | |
de7b2973 | 743 | seq_printf(m, "%s\n", ftrace_event_name(call)); |
b77e38aa SR |
744 | |
745 | return 0; | |
746 | } | |
747 | ||
748 | static void t_stop(struct seq_file *m, void *p) | |
749 | { | |
20c8928a | 750 | mutex_unlock(&event_mutex); |
b77e38aa SR |
751 | } |
752 | ||
1473e441 SR |
753 | static ssize_t |
754 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
755 | loff_t *ppos) | |
756 | { | |
bc6f6b08 ON |
757 | struct ftrace_event_file *file; |
758 | unsigned long flags; | |
a4390596 TZ |
759 | char buf[4] = "0"; |
760 | ||
bc6f6b08 ON |
761 | mutex_lock(&event_mutex); |
762 | file = event_file_data(filp); | |
763 | if (likely(file)) | |
764 | flags = file->flags; | |
765 | mutex_unlock(&event_mutex); | |
766 | ||
767 | if (!file) | |
768 | return -ENODEV; | |
769 | ||
770 | if (flags & FTRACE_EVENT_FL_ENABLED && | |
771 | !(flags & FTRACE_EVENT_FL_SOFT_DISABLED)) | |
a4390596 TZ |
772 | strcpy(buf, "1"); |
773 | ||
bc6f6b08 ON |
774 | if (flags & FTRACE_EVENT_FL_SOFT_DISABLED || |
775 | flags & FTRACE_EVENT_FL_SOFT_MODE) | |
a4390596 TZ |
776 | strcat(buf, "*"); |
777 | ||
778 | strcat(buf, "\n"); | |
1473e441 | 779 | |
417944c4 | 780 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
781 | } |
782 | ||
783 | static ssize_t | |
784 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
785 | loff_t *ppos) | |
786 | { | |
bc6f6b08 | 787 | struct ftrace_event_file *file; |
1473e441 SR |
788 | unsigned long val; |
789 | int ret; | |
790 | ||
22fe9b54 PH |
791 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
792 | if (ret) | |
1473e441 SR |
793 | return ret; |
794 | ||
1852fcce SR |
795 | ret = tracing_update_buffers(); |
796 | if (ret < 0) | |
797 | return ret; | |
798 | ||
1473e441 SR |
799 | switch (val) { |
800 | case 0: | |
1473e441 | 801 | case 1: |
bc6f6b08 | 802 | ret = -ENODEV; |
11a241a3 | 803 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
804 | file = event_file_data(filp); |
805 | if (likely(file)) | |
806 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 807 | mutex_unlock(&event_mutex); |
1473e441 SR |
808 | break; |
809 | ||
810 | default: | |
811 | return -EINVAL; | |
812 | } | |
813 | ||
814 | *ppos += cnt; | |
815 | ||
3b8e4273 | 816 | return ret ? ret : cnt; |
1473e441 SR |
817 | } |
818 | ||
8ae79a13 SR |
819 | static ssize_t |
820 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
821 | loff_t *ppos) | |
822 | { | |
c142b15d | 823 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
ae63b31e SR |
824 | struct ftrace_subsystem_dir *dir = filp->private_data; |
825 | struct event_subsystem *system = dir->subsystem; | |
8ae79a13 | 826 | struct ftrace_event_call *call; |
ae63b31e SR |
827 | struct ftrace_event_file *file; |
828 | struct trace_array *tr = dir->tr; | |
8ae79a13 | 829 | char buf[2]; |
c142b15d | 830 | int set = 0; |
8ae79a13 SR |
831 | int ret; |
832 | ||
8ae79a13 | 833 | mutex_lock(&event_mutex); |
ae63b31e SR |
834 | list_for_each_entry(file, &tr->events, list) { |
835 | call = file->event_call; | |
de7b2973 | 836 | if (!ftrace_event_name(call) || !call->class || !call->class->reg) |
8ae79a13 SR |
837 | continue; |
838 | ||
40ee4dff | 839 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
840 | continue; |
841 | ||
842 | /* | |
843 | * We need to find out if all the events are set | |
844 | * or if all events or cleared, or if we have | |
845 | * a mixture. | |
846 | */ | |
ae63b31e | 847 | set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED)); |
c142b15d | 848 | |
8ae79a13 SR |
849 | /* |
850 | * If we have a mixture, no need to look further. | |
851 | */ | |
c142b15d | 852 | if (set == 3) |
8ae79a13 SR |
853 | break; |
854 | } | |
855 | mutex_unlock(&event_mutex); | |
856 | ||
c142b15d | 857 | buf[0] = set_to_char[set]; |
8ae79a13 | 858 | buf[1] = '\n'; |
8ae79a13 SR |
859 | |
860 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
861 | ||
862 | return ret; | |
863 | } | |
864 | ||
865 | static ssize_t | |
866 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
867 | loff_t *ppos) | |
868 | { | |
ae63b31e SR |
869 | struct ftrace_subsystem_dir *dir = filp->private_data; |
870 | struct event_subsystem *system = dir->subsystem; | |
40ee4dff | 871 | const char *name = NULL; |
8ae79a13 | 872 | unsigned long val; |
8ae79a13 SR |
873 | ssize_t ret; |
874 | ||
22fe9b54 PH |
875 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
876 | if (ret) | |
8ae79a13 SR |
877 | return ret; |
878 | ||
879 | ret = tracing_update_buffers(); | |
880 | if (ret < 0) | |
881 | return ret; | |
882 | ||
8f31bfe5 | 883 | if (val != 0 && val != 1) |
8ae79a13 | 884 | return -EINVAL; |
8ae79a13 | 885 | |
40ee4dff SR |
886 | /* |
887 | * Opening of "enable" adds a ref count to system, | |
888 | * so the name is safe to use. | |
889 | */ | |
890 | if (system) | |
891 | name = system->name; | |
892 | ||
ae63b31e | 893 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 894 | if (ret) |
8f31bfe5 | 895 | goto out; |
8ae79a13 SR |
896 | |
897 | ret = cnt; | |
898 | ||
8f31bfe5 | 899 | out: |
8ae79a13 SR |
900 | *ppos += cnt; |
901 | ||
902 | return ret; | |
903 | } | |
904 | ||
2a37a3df SR |
905 | enum { |
906 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
907 | FORMAT_FIELD_SEPERATOR = 2, |
908 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
909 | }; |
910 | ||
911 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 912 | { |
c5a44a12 | 913 | struct ftrace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
914 | struct list_head *common_head = &ftrace_common_fields; |
915 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 916 | struct list_head *node = v; |
981d081e | 917 | |
2a37a3df | 918 | (*pos)++; |
5a65e956 | 919 | |
2a37a3df SR |
920 | switch ((unsigned long)v) { |
921 | case FORMAT_HEADER: | |
7710b639 ON |
922 | node = common_head; |
923 | break; | |
5a65e956 | 924 | |
86397dc3 | 925 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
926 | node = head; |
927 | break; | |
5a65e956 | 928 | |
2a37a3df SR |
929 | case FORMAT_PRINTFMT: |
930 | /* all done */ | |
931 | return NULL; | |
5a65e956 LJ |
932 | } |
933 | ||
7710b639 ON |
934 | node = node->prev; |
935 | if (node == common_head) | |
86397dc3 | 936 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 937 | else if (node == head) |
2a37a3df | 938 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
939 | else |
940 | return node; | |
2a37a3df SR |
941 | } |
942 | ||
943 | static int f_show(struct seq_file *m, void *v) | |
944 | { | |
c5a44a12 | 945 | struct ftrace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
946 | struct ftrace_event_field *field; |
947 | const char *array_descriptor; | |
948 | ||
949 | switch ((unsigned long)v) { | |
950 | case FORMAT_HEADER: | |
de7b2973 | 951 | seq_printf(m, "name: %s\n", ftrace_event_name(call)); |
2a37a3df | 952 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 953 | seq_puts(m, "format:\n"); |
8728fe50 | 954 | return 0; |
5a65e956 | 955 | |
86397dc3 LZ |
956 | case FORMAT_FIELD_SEPERATOR: |
957 | seq_putc(m, '\n'); | |
958 | return 0; | |
959 | ||
2a37a3df SR |
960 | case FORMAT_PRINTFMT: |
961 | seq_printf(m, "\nprint fmt: %s\n", | |
962 | call->print_fmt); | |
963 | return 0; | |
981d081e | 964 | } |
8728fe50 | 965 | |
7710b639 | 966 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
967 | /* |
968 | * Smartly shows the array type(except dynamic array). | |
969 | * Normal: | |
970 | * field:TYPE VAR | |
971 | * If TYPE := TYPE[LEN], it is shown: | |
972 | * field:TYPE VAR[LEN] | |
973 | */ | |
974 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 975 | |
2a37a3df SR |
976 | if (!strncmp(field->type, "__data_loc", 10)) |
977 | array_descriptor = NULL; | |
8728fe50 | 978 | |
2a37a3df SR |
979 | if (!array_descriptor) |
980 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
981 | field->type, field->name, field->offset, | |
982 | field->size, !!field->is_signed); | |
983 | else | |
984 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
985 | (int)(array_descriptor - field->type), | |
986 | field->type, field->name, | |
987 | array_descriptor, field->offset, | |
988 | field->size, !!field->is_signed); | |
8728fe50 | 989 | |
2a37a3df SR |
990 | return 0; |
991 | } | |
5a65e956 | 992 | |
7710b639 ON |
993 | static void *f_start(struct seq_file *m, loff_t *pos) |
994 | { | |
995 | void *p = (void *)FORMAT_HEADER; | |
996 | loff_t l = 0; | |
997 | ||
c5a44a12 ON |
998 | /* ->stop() is called even if ->start() fails */ |
999 | mutex_lock(&event_mutex); | |
1000 | if (!event_file_data(m->private)) | |
1001 | return ERR_PTR(-ENODEV); | |
1002 | ||
7710b639 ON |
1003 | while (l < *pos && p) |
1004 | p = f_next(m, p, &l); | |
1005 | ||
1006 | return p; | |
1007 | } | |
1008 | ||
2a37a3df SR |
1009 | static void f_stop(struct seq_file *m, void *p) |
1010 | { | |
c5a44a12 | 1011 | mutex_unlock(&event_mutex); |
2a37a3df | 1012 | } |
981d081e | 1013 | |
2a37a3df SR |
1014 | static const struct seq_operations trace_format_seq_ops = { |
1015 | .start = f_start, | |
1016 | .next = f_next, | |
1017 | .stop = f_stop, | |
1018 | .show = f_show, | |
1019 | }; | |
1020 | ||
1021 | static int trace_format_open(struct inode *inode, struct file *file) | |
1022 | { | |
2a37a3df SR |
1023 | struct seq_file *m; |
1024 | int ret; | |
1025 | ||
1026 | ret = seq_open(file, &trace_format_seq_ops); | |
1027 | if (ret < 0) | |
1028 | return ret; | |
1029 | ||
1030 | m = file->private_data; | |
c5a44a12 | 1031 | m->private = file; |
2a37a3df SR |
1032 | |
1033 | return 0; | |
981d081e SR |
1034 | } |
1035 | ||
23725aee PZ |
1036 | static ssize_t |
1037 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1038 | { | |
1a11126b | 1039 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1040 | char buf[32]; |
1041 | int len; | |
23725aee PZ |
1042 | |
1043 | if (*ppos) | |
1044 | return 0; | |
1045 | ||
1a11126b ON |
1046 | if (unlikely(!id)) |
1047 | return -ENODEV; | |
1048 | ||
1049 | len = sprintf(buf, "%d\n", id); | |
1050 | ||
cd458ba9 | 1051 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1052 | } |
1053 | ||
7ce7e424 TZ |
1054 | static ssize_t |
1055 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1056 | loff_t *ppos) | |
1057 | { | |
f306cc82 | 1058 | struct ftrace_event_file *file; |
7ce7e424 | 1059 | struct trace_seq *s; |
e2912b09 | 1060 | int r = -ENODEV; |
7ce7e424 TZ |
1061 | |
1062 | if (*ppos) | |
1063 | return 0; | |
1064 | ||
1065 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1066 | |
7ce7e424 TZ |
1067 | if (!s) |
1068 | return -ENOMEM; | |
1069 | ||
1070 | trace_seq_init(s); | |
1071 | ||
e2912b09 | 1072 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1073 | file = event_file_data(filp); |
1074 | if (file) | |
1075 | print_event_filter(file, s); | |
e2912b09 ON |
1076 | mutex_unlock(&event_mutex); |
1077 | ||
f306cc82 | 1078 | if (file) |
5ac48378 SRRH |
1079 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1080 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1081 | |
1082 | kfree(s); | |
1083 | ||
1084 | return r; | |
1085 | } | |
1086 | ||
1087 | static ssize_t | |
1088 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1089 | loff_t *ppos) | |
1090 | { | |
f306cc82 | 1091 | struct ftrace_event_file *file; |
8b372562 | 1092 | char *buf; |
e2912b09 | 1093 | int err = -ENODEV; |
7ce7e424 | 1094 | |
8b372562 | 1095 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1096 | return -EINVAL; |
1097 | ||
8b372562 TZ |
1098 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1099 | if (!buf) | |
7ce7e424 TZ |
1100 | return -ENOMEM; |
1101 | ||
8b372562 TZ |
1102 | if (copy_from_user(buf, ubuf, cnt)) { |
1103 | free_page((unsigned long) buf); | |
1104 | return -EFAULT; | |
7ce7e424 | 1105 | } |
8b372562 | 1106 | buf[cnt] = '\0'; |
7ce7e424 | 1107 | |
e2912b09 | 1108 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1109 | file = event_file_data(filp); |
1110 | if (file) | |
1111 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1112 | mutex_unlock(&event_mutex); |
1113 | ||
8b372562 TZ |
1114 | free_page((unsigned long) buf); |
1115 | if (err < 0) | |
44e9c8b7 | 1116 | return err; |
0a19e53c | 1117 | |
7ce7e424 TZ |
1118 | *ppos += cnt; |
1119 | ||
1120 | return cnt; | |
1121 | } | |
1122 | ||
e9dbfae5 SR |
1123 | static LIST_HEAD(event_subsystems); |
1124 | ||
1125 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1126 | { | |
1127 | struct event_subsystem *system = NULL; | |
ae63b31e SR |
1128 | struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
1129 | struct trace_array *tr; | |
e9dbfae5 SR |
1130 | int ret; |
1131 | ||
d6d3523c GB |
1132 | if (tracing_is_disabled()) |
1133 | return -ENODEV; | |
1134 | ||
e9dbfae5 | 1135 | /* Make sure the system still exists */ |
a8227415 | 1136 | mutex_lock(&trace_types_lock); |
e9dbfae5 | 1137 | mutex_lock(&event_mutex); |
ae63b31e SR |
1138 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1139 | list_for_each_entry(dir, &tr->systems, list) { | |
1140 | if (dir == inode->i_private) { | |
1141 | /* Don't open systems with no events */ | |
1142 | if (dir->nr_events) { | |
1143 | __get_system_dir(dir); | |
1144 | system = dir->subsystem; | |
1145 | } | |
1146 | goto exit_loop; | |
e9dbfae5 | 1147 | } |
e9dbfae5 SR |
1148 | } |
1149 | } | |
ae63b31e | 1150 | exit_loop: |
e9dbfae5 | 1151 | mutex_unlock(&event_mutex); |
a8227415 | 1152 | mutex_unlock(&trace_types_lock); |
e9dbfae5 | 1153 | |
ae63b31e | 1154 | if (!system) |
e9dbfae5 SR |
1155 | return -ENODEV; |
1156 | ||
ae63b31e SR |
1157 | /* Some versions of gcc think dir can be uninitialized here */ |
1158 | WARN_ON(!dir); | |
1159 | ||
8e2e2fa4 SRRH |
1160 | /* Still need to increment the ref count of the system */ |
1161 | if (trace_array_get(tr) < 0) { | |
1162 | put_system(dir); | |
1163 | return -ENODEV; | |
1164 | } | |
1165 | ||
e9dbfae5 | 1166 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1167 | if (ret < 0) { |
1168 | trace_array_put(tr); | |
ae63b31e | 1169 | put_system(dir); |
8e2e2fa4 | 1170 | } |
ae63b31e SR |
1171 | |
1172 | return ret; | |
1173 | } | |
1174 | ||
1175 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1176 | { | |
1177 | struct ftrace_subsystem_dir *dir; | |
1178 | struct trace_array *tr = inode->i_private; | |
1179 | int ret; | |
1180 | ||
d6d3523c GB |
1181 | if (tracing_is_disabled()) |
1182 | return -ENODEV; | |
1183 | ||
8e2e2fa4 SRRH |
1184 | if (trace_array_get(tr) < 0) |
1185 | return -ENODEV; | |
1186 | ||
ae63b31e SR |
1187 | /* Make a temporary dir that has no system but points to tr */ |
1188 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
8e2e2fa4 SRRH |
1189 | if (!dir) { |
1190 | trace_array_put(tr); | |
ae63b31e | 1191 | return -ENOMEM; |
8e2e2fa4 | 1192 | } |
ae63b31e SR |
1193 | |
1194 | dir->tr = tr; | |
1195 | ||
1196 | ret = tracing_open_generic(inode, filp); | |
8e2e2fa4 SRRH |
1197 | if (ret < 0) { |
1198 | trace_array_put(tr); | |
ae63b31e | 1199 | kfree(dir); |
d6d3523c | 1200 | return ret; |
8e2e2fa4 | 1201 | } |
ae63b31e SR |
1202 | |
1203 | filp->private_data = dir; | |
e9dbfae5 | 1204 | |
d6d3523c | 1205 | return 0; |
e9dbfae5 SR |
1206 | } |
1207 | ||
1208 | static int subsystem_release(struct inode *inode, struct file *file) | |
1209 | { | |
ae63b31e | 1210 | struct ftrace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1211 | |
8e2e2fa4 SRRH |
1212 | trace_array_put(dir->tr); |
1213 | ||
ae63b31e SR |
1214 | /* |
1215 | * If dir->subsystem is NULL, then this is a temporary | |
1216 | * descriptor that was made for a trace_array to enable | |
1217 | * all subsystems. | |
1218 | */ | |
1219 | if (dir->subsystem) | |
1220 | put_system(dir); | |
1221 | else | |
1222 | kfree(dir); | |
e9dbfae5 SR |
1223 | |
1224 | return 0; | |
1225 | } | |
1226 | ||
cfb180f3 TZ |
1227 | static ssize_t |
1228 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1229 | loff_t *ppos) | |
1230 | { | |
ae63b31e SR |
1231 | struct ftrace_subsystem_dir *dir = filp->private_data; |
1232 | struct event_subsystem *system = dir->subsystem; | |
cfb180f3 TZ |
1233 | struct trace_seq *s; |
1234 | int r; | |
1235 | ||
1236 | if (*ppos) | |
1237 | return 0; | |
1238 | ||
1239 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1240 | if (!s) | |
1241 | return -ENOMEM; | |
1242 | ||
1243 | trace_seq_init(s); | |
1244 | ||
8b372562 | 1245 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1246 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1247 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1248 | |
1249 | kfree(s); | |
1250 | ||
1251 | return r; | |
1252 | } | |
1253 | ||
1254 | static ssize_t | |
1255 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1256 | loff_t *ppos) | |
1257 | { | |
ae63b31e | 1258 | struct ftrace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1259 | char *buf; |
cfb180f3 TZ |
1260 | int err; |
1261 | ||
8b372562 | 1262 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1263 | return -EINVAL; |
1264 | ||
8b372562 TZ |
1265 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1266 | if (!buf) | |
cfb180f3 TZ |
1267 | return -ENOMEM; |
1268 | ||
8b372562 TZ |
1269 | if (copy_from_user(buf, ubuf, cnt)) { |
1270 | free_page((unsigned long) buf); | |
1271 | return -EFAULT; | |
cfb180f3 | 1272 | } |
8b372562 | 1273 | buf[cnt] = '\0'; |
cfb180f3 | 1274 | |
ae63b31e | 1275 | err = apply_subsystem_event_filter(dir, buf); |
8b372562 TZ |
1276 | free_page((unsigned long) buf); |
1277 | if (err < 0) | |
44e9c8b7 | 1278 | return err; |
cfb180f3 TZ |
1279 | |
1280 | *ppos += cnt; | |
1281 | ||
1282 | return cnt; | |
1283 | } | |
1284 | ||
d1b182a8 SR |
1285 | static ssize_t |
1286 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1287 | { | |
1288 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1289 | struct trace_seq *s; | |
1290 | int r; | |
1291 | ||
1292 | if (*ppos) | |
1293 | return 0; | |
1294 | ||
1295 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1296 | if (!s) | |
1297 | return -ENOMEM; | |
1298 | ||
1299 | trace_seq_init(s); | |
1300 | ||
1301 | func(s); | |
5ac48378 SRRH |
1302 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1303 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1304 | |
1305 | kfree(s); | |
1306 | ||
1307 | return r; | |
1308 | } | |
1309 | ||
15075cac SR |
1310 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1311 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
f77d09a3 | 1312 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1313 | |
b77e38aa SR |
1314 | static const struct seq_operations show_event_seq_ops = { |
1315 | .start = t_start, | |
1316 | .next = t_next, | |
1317 | .show = t_show, | |
1318 | .stop = t_stop, | |
1319 | }; | |
1320 | ||
1321 | static const struct seq_operations show_set_event_seq_ops = { | |
1322 | .start = s_start, | |
1323 | .next = s_next, | |
1324 | .show = t_show, | |
1325 | .stop = t_stop, | |
1326 | }; | |
1327 | ||
2314c4ae | 1328 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1329 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1330 | .read = seq_read, |
1331 | .llseek = seq_lseek, | |
1332 | .release = seq_release, | |
1333 | }; | |
1334 | ||
b77e38aa | 1335 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1336 | .open = ftrace_event_set_open, |
b77e38aa SR |
1337 | .read = seq_read, |
1338 | .write = ftrace_event_write, | |
1339 | .llseek = seq_lseek, | |
f77d09a3 | 1340 | .release = ftrace_event_release, |
b77e38aa SR |
1341 | }; |
1342 | ||
1473e441 | 1343 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 1344 | .open = tracing_open_generic, |
1473e441 SR |
1345 | .read = event_enable_read, |
1346 | .write = event_enable_write, | |
6038f373 | 1347 | .llseek = default_llseek, |
1473e441 SR |
1348 | }; |
1349 | ||
981d081e | 1350 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1351 | .open = trace_format_open, |
1352 | .read = seq_read, | |
1353 | .llseek = seq_lseek, | |
1354 | .release = seq_release, | |
981d081e SR |
1355 | }; |
1356 | ||
23725aee | 1357 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1358 | .read = event_id_read, |
6038f373 | 1359 | .llseek = default_llseek, |
23725aee PZ |
1360 | }; |
1361 | ||
7ce7e424 TZ |
1362 | static const struct file_operations ftrace_event_filter_fops = { |
1363 | .open = tracing_open_generic, | |
1364 | .read = event_filter_read, | |
1365 | .write = event_filter_write, | |
6038f373 | 1366 | .llseek = default_llseek, |
7ce7e424 TZ |
1367 | }; |
1368 | ||
cfb180f3 | 1369 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1370 | .open = subsystem_open, |
cfb180f3 TZ |
1371 | .read = subsystem_filter_read, |
1372 | .write = subsystem_filter_write, | |
6038f373 | 1373 | .llseek = default_llseek, |
e9dbfae5 | 1374 | .release = subsystem_release, |
cfb180f3 TZ |
1375 | }; |
1376 | ||
8ae79a13 | 1377 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1378 | .open = subsystem_open, |
8ae79a13 SR |
1379 | .read = system_enable_read, |
1380 | .write = system_enable_write, | |
6038f373 | 1381 | .llseek = default_llseek, |
40ee4dff | 1382 | .release = subsystem_release, |
8ae79a13 SR |
1383 | }; |
1384 | ||
ae63b31e SR |
1385 | static const struct file_operations ftrace_tr_enable_fops = { |
1386 | .open = system_tr_open, | |
1387 | .read = system_enable_read, | |
1388 | .write = system_enable_write, | |
1389 | .llseek = default_llseek, | |
1390 | .release = subsystem_release, | |
1391 | }; | |
1392 | ||
d1b182a8 SR |
1393 | static const struct file_operations ftrace_show_header_fops = { |
1394 | .open = tracing_open_generic, | |
1395 | .read = show_header, | |
6038f373 | 1396 | .llseek = default_llseek, |
d1b182a8 SR |
1397 | }; |
1398 | ||
ae63b31e SR |
1399 | static int |
1400 | ftrace_event_open(struct inode *inode, struct file *file, | |
1401 | const struct seq_operations *seq_ops) | |
1473e441 | 1402 | { |
ae63b31e SR |
1403 | struct seq_file *m; |
1404 | int ret; | |
1473e441 | 1405 | |
ae63b31e SR |
1406 | ret = seq_open(file, seq_ops); |
1407 | if (ret < 0) | |
1408 | return ret; | |
1409 | m = file->private_data; | |
1410 | /* copy tr over to seq ops */ | |
1411 | m->private = inode->i_private; | |
1473e441 | 1412 | |
ae63b31e | 1413 | return ret; |
1473e441 SR |
1414 | } |
1415 | ||
f77d09a3 AL |
1416 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1417 | { | |
1418 | struct trace_array *tr = inode->i_private; | |
1419 | ||
1420 | trace_array_put(tr); | |
1421 | ||
1422 | return seq_release(inode, file); | |
1423 | } | |
1424 | ||
15075cac SR |
1425 | static int |
1426 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1427 | { | |
1428 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1429 | ||
ae63b31e | 1430 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1431 | } |
1432 | ||
1433 | static int | |
1434 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1435 | { | |
1436 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1437 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
1438 | int ret; |
1439 | ||
1440 | if (trace_array_get(tr) < 0) | |
1441 | return -ENODEV; | |
15075cac SR |
1442 | |
1443 | if ((file->f_mode & FMODE_WRITE) && | |
1444 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1445 | ftrace_clear_events(tr); |
15075cac | 1446 | |
f77d09a3 AL |
1447 | ret = ftrace_event_open(inode, file, seq_ops); |
1448 | if (ret < 0) | |
1449 | trace_array_put(tr); | |
1450 | return ret; | |
ae63b31e SR |
1451 | } |
1452 | ||
1453 | static struct event_subsystem * | |
1454 | create_new_subsystem(const char *name) | |
1455 | { | |
1456 | struct event_subsystem *system; | |
1457 | ||
1458 | /* need to create new entry */ | |
1459 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1460 | if (!system) | |
1461 | return NULL; | |
1462 | ||
1463 | system->ref_count = 1; | |
6e94a780 SR |
1464 | |
1465 | /* Only allocate if dynamic (kprobes and modules) */ | |
1466 | if (!core_kernel_data((unsigned long)name)) { | |
1467 | system->ref_count |= SYSTEM_FL_FREE_NAME; | |
1468 | system->name = kstrdup(name, GFP_KERNEL); | |
1469 | if (!system->name) | |
1470 | goto out_free; | |
1471 | } else | |
1472 | system->name = name; | |
ae63b31e SR |
1473 | |
1474 | system->filter = NULL; | |
1475 | ||
1476 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1477 | if (!system->filter) | |
1478 | goto out_free; | |
1479 | ||
1480 | list_add(&system->list, &event_subsystems); | |
1481 | ||
1482 | return system; | |
1483 | ||
1484 | out_free: | |
6e94a780 SR |
1485 | if (system->ref_count & SYSTEM_FL_FREE_NAME) |
1486 | kfree(system->name); | |
ae63b31e SR |
1487 | kfree(system); |
1488 | return NULL; | |
15075cac SR |
1489 | } |
1490 | ||
6ecc2d1c | 1491 | static struct dentry * |
ae63b31e SR |
1492 | event_subsystem_dir(struct trace_array *tr, const char *name, |
1493 | struct ftrace_event_file *file, struct dentry *parent) | |
6ecc2d1c | 1494 | { |
ae63b31e | 1495 | struct ftrace_subsystem_dir *dir; |
6ecc2d1c | 1496 | struct event_subsystem *system; |
e1112b4d | 1497 | struct dentry *entry; |
6ecc2d1c SR |
1498 | |
1499 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1500 | list_for_each_entry(dir, &tr->systems, list) { |
1501 | system = dir->subsystem; | |
dc82ec98 | 1502 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1503 | dir->nr_events++; |
1504 | file->system = dir; | |
1505 | return dir->entry; | |
dc82ec98 | 1506 | } |
6ecc2d1c SR |
1507 | } |
1508 | ||
ae63b31e SR |
1509 | /* Now see if the system itself exists. */ |
1510 | list_for_each_entry(system, &event_subsystems, list) { | |
1511 | if (strcmp(system->name, name) == 0) | |
1512 | break; | |
6ecc2d1c | 1513 | } |
ae63b31e SR |
1514 | /* Reset system variable when not found */ |
1515 | if (&system->list == &event_subsystems) | |
1516 | system = NULL; | |
6ecc2d1c | 1517 | |
ae63b31e SR |
1518 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1519 | if (!dir) | |
1520 | goto out_fail; | |
6ecc2d1c | 1521 | |
ae63b31e SR |
1522 | if (!system) { |
1523 | system = create_new_subsystem(name); | |
1524 | if (!system) | |
1525 | goto out_free; | |
1526 | } else | |
1527 | __get_system(system); | |
1528 | ||
1529 | dir->entry = debugfs_create_dir(name, parent); | |
1530 | if (!dir->entry) { | |
3448bac3 | 1531 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
1532 | __put_system(system); |
1533 | goto out_free; | |
6d723736 SR |
1534 | } |
1535 | ||
ae63b31e SR |
1536 | dir->tr = tr; |
1537 | dir->ref_count = 1; | |
1538 | dir->nr_events = 1; | |
1539 | dir->subsystem = system; | |
1540 | file->system = dir; | |
8b372562 | 1541 | |
ae63b31e | 1542 | entry = debugfs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1543 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1544 | if (!entry) { |
1545 | kfree(system->filter); | |
1546 | system->filter = NULL; | |
3448bac3 | 1547 | pr_warn("Could not create debugfs '%s/filter' entry\n", name); |
8b372562 | 1548 | } |
e1112b4d | 1549 | |
ae63b31e | 1550 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1551 | &ftrace_system_enable_fops); |
8ae79a13 | 1552 | |
ae63b31e SR |
1553 | list_add(&dir->list, &tr->systems); |
1554 | ||
1555 | return dir->entry; | |
1556 | ||
1557 | out_free: | |
1558 | kfree(dir); | |
1559 | out_fail: | |
1560 | /* Only print this message if failed on memory allocation */ | |
1561 | if (!dir || !system) | |
3448bac3 | 1562 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 1563 | return NULL; |
6ecc2d1c SR |
1564 | } |
1565 | ||
1473e441 | 1566 | static int |
620a30e9 | 1567 | event_create_dir(struct dentry *parent, struct ftrace_event_file *file) |
1473e441 | 1568 | { |
ae63b31e SR |
1569 | struct ftrace_event_call *call = file->event_call; |
1570 | struct trace_array *tr = file->tr; | |
2e33af02 | 1571 | struct list_head *head; |
ae63b31e | 1572 | struct dentry *d_events; |
de7b2973 | 1573 | const char *name; |
fd994989 | 1574 | int ret; |
1473e441 | 1575 | |
6ecc2d1c SR |
1576 | /* |
1577 | * If the trace point header did not define TRACE_SYSTEM | |
1578 | * then the system would be called "TRACE_SYSTEM". | |
1579 | */ | |
ae63b31e SR |
1580 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1581 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1582 | if (!d_events) | |
1583 | return -ENOMEM; | |
1584 | } else | |
1585 | d_events = parent; | |
1586 | ||
de7b2973 MD |
1587 | name = ftrace_event_name(call); |
1588 | file->dir = debugfs_create_dir(name, d_events); | |
ae63b31e | 1589 | if (!file->dir) { |
3448bac3 | 1590 | pr_warn("Could not create debugfs '%s' directory\n", name); |
1473e441 SR |
1591 | return -1; |
1592 | } | |
1593 | ||
9b63776f | 1594 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1595 | trace_create_file("enable", 0644, file->dir, file, |
620a30e9 | 1596 | &ftrace_enable_fops); |
1473e441 | 1597 | |
2239291a | 1598 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1599 | if (call->event.type && call->class->reg) |
1a11126b | 1600 | trace_create_file("id", 0444, file->dir, |
620a30e9 ON |
1601 | (void *)(long)call->event.type, |
1602 | &ftrace_event_id_fops); | |
2239291a | 1603 | #endif |
23725aee | 1604 | |
c9d932cf LZ |
1605 | /* |
1606 | * Other events may have the same class. Only update | |
1607 | * the fields if they are not already defined. | |
1608 | */ | |
1609 | head = trace_get_fields(call); | |
1610 | if (list_empty(head)) { | |
1611 | ret = call->class->define_fields(call); | |
1612 | if (ret < 0) { | |
3448bac3 FF |
1613 | pr_warn("Could not initialize trace point events/%s\n", |
1614 | name); | |
ae63b31e | 1615 | return -1; |
cf027f64 TZ |
1616 | } |
1617 | } | |
f306cc82 | 1618 | trace_create_file("filter", 0644, file->dir, file, |
620a30e9 | 1619 | &ftrace_event_filter_fops); |
cf027f64 | 1620 | |
85f2b082 TZ |
1621 | trace_create_file("trigger", 0644, file->dir, file, |
1622 | &event_trigger_fops); | |
1623 | ||
ae63b31e | 1624 | trace_create_file("format", 0444, file->dir, call, |
620a30e9 | 1625 | &ftrace_event_format_fops); |
6d723736 SR |
1626 | |
1627 | return 0; | |
1628 | } | |
1629 | ||
ae63b31e SR |
1630 | static void remove_event_from_tracers(struct ftrace_event_call *call) |
1631 | { | |
1632 | struct ftrace_event_file *file; | |
1633 | struct trace_array *tr; | |
1634 | ||
1635 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
1636 | if (file->event_call != call) |
1637 | continue; | |
1638 | ||
f6a84bdc | 1639 | remove_event_file_dir(file); |
ae63b31e SR |
1640 | /* |
1641 | * The do_for_each_event_file_safe() is | |
1642 | * a double loop. After finding the call for this | |
1643 | * trace_array, we use break to jump to the next | |
1644 | * trace_array. | |
1645 | */ | |
1646 | break; | |
1647 | } while_for_each_event_file(); | |
1648 | } | |
1649 | ||
8781915a EG |
1650 | static void event_remove(struct ftrace_event_call *call) |
1651 | { | |
ae63b31e SR |
1652 | struct trace_array *tr; |
1653 | struct ftrace_event_file *file; | |
1654 | ||
1655 | do_for_each_event_file(tr, file) { | |
1656 | if (file->event_call != call) | |
1657 | continue; | |
1658 | ftrace_event_enable_disable(file, 0); | |
1659 | /* | |
1660 | * The do_for_each_event_file() is | |
1661 | * a double loop. After finding the call for this | |
1662 | * trace_array, we use break to jump to the next | |
1663 | * trace_array. | |
1664 | */ | |
1665 | break; | |
1666 | } while_for_each_event_file(); | |
1667 | ||
8781915a EG |
1668 | if (call->event.funcs) |
1669 | __unregister_ftrace_event(&call->event); | |
ae63b31e | 1670 | remove_event_from_tracers(call); |
8781915a EG |
1671 | list_del(&call->list); |
1672 | } | |
1673 | ||
1674 | static int event_init(struct ftrace_event_call *call) | |
1675 | { | |
1676 | int ret = 0; | |
de7b2973 | 1677 | const char *name; |
8781915a | 1678 | |
de7b2973 MD |
1679 | name = ftrace_event_name(call); |
1680 | if (WARN_ON(!name)) | |
8781915a EG |
1681 | return -EINVAL; |
1682 | ||
1683 | if (call->class->raw_init) { | |
1684 | ret = call->class->raw_init(call); | |
1685 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 1686 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
1687 | } |
1688 | ||
1689 | return ret; | |
1690 | } | |
1691 | ||
67ead0a6 | 1692 | static int |
ae63b31e | 1693 | __register_event(struct ftrace_event_call *call, struct module *mod) |
bd1a5c84 | 1694 | { |
bd1a5c84 | 1695 | int ret; |
6d723736 | 1696 | |
8781915a EG |
1697 | ret = event_init(call); |
1698 | if (ret < 0) | |
1699 | return ret; | |
701970b3 | 1700 | |
ae63b31e | 1701 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 1702 | call->mod = mod; |
88f70d75 | 1703 | |
ae63b31e | 1704 | return 0; |
bd1a5c84 MH |
1705 | } |
1706 | ||
0c564a53 SRRH |
1707 | static char *enum_replace(char *ptr, struct trace_enum_map *map, int len) |
1708 | { | |
1709 | int rlen; | |
1710 | int elen; | |
1711 | ||
1712 | /* Find the length of the enum value as a string */ | |
1713 | elen = snprintf(ptr, 0, "%ld", map->enum_value); | |
1714 | /* Make sure there's enough room to replace the string with the value */ | |
1715 | if (len < elen) | |
1716 | return NULL; | |
1717 | ||
1718 | snprintf(ptr, elen + 1, "%ld", map->enum_value); | |
1719 | ||
1720 | /* Get the rest of the string of ptr */ | |
1721 | rlen = strlen(ptr + len); | |
1722 | memmove(ptr + elen, ptr + len, rlen); | |
1723 | /* Make sure we end the new string */ | |
1724 | ptr[elen + rlen] = 0; | |
1725 | ||
1726 | return ptr + elen; | |
1727 | } | |
1728 | ||
1729 | static void update_event_printk(struct ftrace_event_call *call, | |
1730 | struct trace_enum_map *map) | |
1731 | { | |
1732 | char *ptr; | |
1733 | int quote = 0; | |
1734 | int len = strlen(map->enum_string); | |
1735 | ||
1736 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
1737 | if (*ptr == '\\') { | |
1738 | ptr++; | |
1739 | /* paranoid */ | |
1740 | if (!*ptr) | |
1741 | break; | |
1742 | continue; | |
1743 | } | |
1744 | if (*ptr == '"') { | |
1745 | quote ^= 1; | |
1746 | continue; | |
1747 | } | |
1748 | if (quote) | |
1749 | continue; | |
1750 | if (isdigit(*ptr)) { | |
1751 | /* skip numbers */ | |
1752 | do { | |
1753 | ptr++; | |
1754 | /* Check for alpha chars like ULL */ | |
1755 | } while (isalnum(*ptr)); | |
1756 | /* | |
1757 | * A number must have some kind of delimiter after | |
1758 | * it, and we can ignore that too. | |
1759 | */ | |
1760 | continue; | |
1761 | } | |
1762 | if (isalpha(*ptr) || *ptr == '_') { | |
1763 | if (strncmp(map->enum_string, ptr, len) == 0 && | |
1764 | !isalnum(ptr[len]) && ptr[len] != '_') { | |
1765 | ptr = enum_replace(ptr, map, len); | |
1766 | /* Hmm, enum string smaller than value */ | |
1767 | if (WARN_ON_ONCE(!ptr)) | |
1768 | return; | |
1769 | /* | |
1770 | * No need to decrement here, as enum_replace() | |
1771 | * returns the pointer to the character passed | |
1772 | * the enum, and two enums can not be placed | |
1773 | * back to back without something in between. | |
1774 | * We can skip that something in between. | |
1775 | */ | |
1776 | continue; | |
1777 | } | |
1778 | skip_more: | |
1779 | do { | |
1780 | ptr++; | |
1781 | } while (isalnum(*ptr) || *ptr == '_'); | |
1782 | /* | |
1783 | * If what comes after this variable is a '.' or | |
1784 | * '->' then we can continue to ignore that string. | |
1785 | */ | |
1786 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
1787 | ptr += *ptr == '.' ? 1 : 2; | |
1788 | goto skip_more; | |
1789 | } | |
1790 | /* | |
1791 | * Once again, we can skip the delimiter that came | |
1792 | * after the string. | |
1793 | */ | |
1794 | continue; | |
1795 | } | |
1796 | } | |
1797 | } | |
1798 | ||
1799 | void trace_event_enum_update(struct trace_enum_map **map, int len) | |
1800 | { | |
1801 | struct ftrace_event_call *call, *p; | |
1802 | const char *last_system = NULL; | |
1803 | int last_i; | |
1804 | int i; | |
1805 | ||
1806 | down_write(&trace_event_sem); | |
1807 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
1808 | /* events are usually grouped together with systems */ | |
1809 | if (!last_system || call->class->system != last_system) { | |
1810 | last_i = 0; | |
1811 | last_system = call->class->system; | |
1812 | } | |
1813 | ||
1814 | for (i = last_i; i < len; i++) { | |
1815 | if (call->class->system == map[i]->system) { | |
1816 | /* Save the first system if need be */ | |
1817 | if (!last_i) | |
1818 | last_i = i; | |
1819 | update_event_printk(call, map[i]); | |
1820 | } | |
1821 | } | |
1822 | } | |
1823 | up_write(&trace_event_sem); | |
1824 | } | |
1825 | ||
da511bf3 SRRH |
1826 | static struct ftrace_event_file * |
1827 | trace_create_new_event(struct ftrace_event_call *call, | |
1828 | struct trace_array *tr) | |
1829 | { | |
1830 | struct ftrace_event_file *file; | |
1831 | ||
1832 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
1833 | if (!file) | |
1834 | return NULL; | |
1835 | ||
1836 | file->event_call = call; | |
1837 | file->tr = tr; | |
1838 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
1839 | atomic_set(&file->tm_ref, 0); |
1840 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
1841 | list_add(&file->list, &tr->events); |
1842 | ||
1843 | return file; | |
1844 | } | |
1845 | ||
ae63b31e SR |
1846 | /* Add an event to a trace directory */ |
1847 | static int | |
620a30e9 | 1848 | __trace_add_new_event(struct ftrace_event_call *call, struct trace_array *tr) |
ae63b31e SR |
1849 | { |
1850 | struct ftrace_event_file *file; | |
1851 | ||
da511bf3 | 1852 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
1853 | if (!file) |
1854 | return -ENOMEM; | |
1855 | ||
620a30e9 | 1856 | return event_create_dir(tr->event_dir, file); |
ae63b31e SR |
1857 | } |
1858 | ||
77248221 SR |
1859 | /* |
1860 | * Just create a decriptor for early init. A descriptor is required | |
1861 | * for enabling events at boot. We want to enable events before | |
1862 | * the filesystem is initialized. | |
1863 | */ | |
1864 | static __init int | |
1865 | __trace_early_add_new_event(struct ftrace_event_call *call, | |
1866 | struct trace_array *tr) | |
1867 | { | |
1868 | struct ftrace_event_file *file; | |
1869 | ||
da511bf3 | 1870 | file = trace_create_new_event(call, tr); |
77248221 SR |
1871 | if (!file) |
1872 | return -ENOMEM; | |
1873 | ||
77248221 SR |
1874 | return 0; |
1875 | } | |
1876 | ||
ae63b31e | 1877 | struct ftrace_module_file_ops; |
779c5e37 | 1878 | static void __add_event_to_tracers(struct ftrace_event_call *call); |
ae63b31e | 1879 | |
bd1a5c84 MH |
1880 | /* Add an additional event_call dynamically */ |
1881 | int trace_add_event_call(struct ftrace_event_call *call) | |
1882 | { | |
1883 | int ret; | |
a8227415 | 1884 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 1885 | mutex_lock(&event_mutex); |
701970b3 | 1886 | |
ae63b31e SR |
1887 | ret = __register_event(call, NULL); |
1888 | if (ret >= 0) | |
779c5e37 | 1889 | __add_event_to_tracers(call); |
a2ca5e03 | 1890 | |
ae63b31e | 1891 | mutex_unlock(&event_mutex); |
a8227415 | 1892 | mutex_unlock(&trace_types_lock); |
ae63b31e | 1893 | return ret; |
a2ca5e03 FW |
1894 | } |
1895 | ||
4fead8e4 | 1896 | /* |
a8227415 AL |
1897 | * Must be called under locking of trace_types_lock, event_mutex and |
1898 | * trace_event_sem. | |
4fead8e4 | 1899 | */ |
bd1a5c84 MH |
1900 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1901 | { | |
8781915a | 1902 | event_remove(call); |
bd1a5c84 | 1903 | trace_destroy_fields(call); |
57375747 ON |
1904 | free_event_filter(call->filter); |
1905 | call->filter = NULL; | |
bd1a5c84 MH |
1906 | } |
1907 | ||
2816c551 ON |
1908 | static int probe_remove_event_call(struct ftrace_event_call *call) |
1909 | { | |
1910 | struct trace_array *tr; | |
1911 | struct ftrace_event_file *file; | |
1912 | ||
1913 | #ifdef CONFIG_PERF_EVENTS | |
1914 | if (call->perf_refcount) | |
1915 | return -EBUSY; | |
1916 | #endif | |
1917 | do_for_each_event_file(tr, file) { | |
1918 | if (file->event_call != call) | |
1919 | continue; | |
1920 | /* | |
1921 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
1922 | * we are going to do, FTRACE_EVENT_FL_SOFT_MODE can suppress | |
1923 | * TRACE_REG_UNREGISTER. | |
1924 | */ | |
1925 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
1926 | return -EBUSY; | |
2ba64035 SRRH |
1927 | /* |
1928 | * The do_for_each_event_file_safe() is | |
1929 | * a double loop. After finding the call for this | |
1930 | * trace_array, we use break to jump to the next | |
1931 | * trace_array. | |
1932 | */ | |
2816c551 ON |
1933 | break; |
1934 | } while_for_each_event_file(); | |
1935 | ||
1936 | __trace_remove_event_call(call); | |
1937 | ||
1938 | return 0; | |
1939 | } | |
1940 | ||
bd1a5c84 | 1941 | /* Remove an event_call */ |
2816c551 | 1942 | int trace_remove_event_call(struct ftrace_event_call *call) |
bd1a5c84 | 1943 | { |
2816c551 ON |
1944 | int ret; |
1945 | ||
a8227415 | 1946 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 1947 | mutex_lock(&event_mutex); |
52f6ad6d | 1948 | down_write(&trace_event_sem); |
2816c551 | 1949 | ret = probe_remove_event_call(call); |
52f6ad6d | 1950 | up_write(&trace_event_sem); |
bd1a5c84 | 1951 | mutex_unlock(&event_mutex); |
a8227415 | 1952 | mutex_unlock(&trace_types_lock); |
2816c551 ON |
1953 | |
1954 | return ret; | |
bd1a5c84 MH |
1955 | } |
1956 | ||
1957 | #define for_each_event(event, start, end) \ | |
1958 | for (event = start; \ | |
1959 | (unsigned long)event < (unsigned long)end; \ | |
1960 | event++) | |
1961 | ||
1962 | #ifdef CONFIG_MODULES | |
1963 | ||
6d723736 SR |
1964 | static void trace_module_add_events(struct module *mod) |
1965 | { | |
e4a9ea5e | 1966 | struct ftrace_event_call **call, **start, **end; |
6d723736 | 1967 | |
45ab2813 SRRH |
1968 | if (!mod->num_trace_events) |
1969 | return; | |
1970 | ||
1971 | /* Don't add infrastructure for mods without tracepoints */ | |
1972 | if (trace_module_has_bad_taint(mod)) { | |
1973 | pr_err("%s: module has bad taint, not creating trace events\n", | |
1974 | mod->name); | |
1975 | return; | |
1976 | } | |
1977 | ||
6d723736 SR |
1978 | start = mod->trace_events; |
1979 | end = mod->trace_events + mod->num_trace_events; | |
1980 | ||
6d723736 | 1981 | for_each_event(call, start, end) { |
ae63b31e | 1982 | __register_event(*call, mod); |
779c5e37 | 1983 | __add_event_to_tracers(*call); |
6d723736 SR |
1984 | } |
1985 | } | |
1986 | ||
1987 | static void trace_module_remove_events(struct module *mod) | |
1988 | { | |
1989 | struct ftrace_event_call *call, *p; | |
575380da | 1990 | bool clear_trace = false; |
6d723736 | 1991 | |
52f6ad6d | 1992 | down_write(&trace_event_sem); |
6d723736 SR |
1993 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
1994 | if (call->mod == mod) { | |
575380da SRRH |
1995 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
1996 | clear_trace = true; | |
bd1a5c84 | 1997 | __trace_remove_event_call(call); |
6d723736 SR |
1998 | } |
1999 | } | |
52f6ad6d | 2000 | up_write(&trace_event_sem); |
9456f0fa SR |
2001 | |
2002 | /* | |
2003 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
2004 | * registered any events that were used. The only worry is if |
2005 | * a new module gets loaded, and takes on the same id as the events | |
2006 | * of this module. When printing out the buffer, traced events left | |
2007 | * over from this module may be passed to the new module events and | |
2008 | * unexpected results may occur. | |
9456f0fa | 2009 | */ |
575380da | 2010 | if (clear_trace) |
873c642f | 2011 | tracing_reset_all_online_cpus(); |
6d723736 SR |
2012 | } |
2013 | ||
61f919a1 SR |
2014 | static int trace_module_notify(struct notifier_block *self, |
2015 | unsigned long val, void *data) | |
6d723736 SR |
2016 | { |
2017 | struct module *mod = data; | |
2018 | ||
a8227415 | 2019 | mutex_lock(&trace_types_lock); |
6d723736 SR |
2020 | mutex_lock(&event_mutex); |
2021 | switch (val) { | |
2022 | case MODULE_STATE_COMING: | |
2023 | trace_module_add_events(mod); | |
2024 | break; | |
2025 | case MODULE_STATE_GOING: | |
2026 | trace_module_remove_events(mod); | |
2027 | break; | |
2028 | } | |
2029 | mutex_unlock(&event_mutex); | |
a8227415 | 2030 | mutex_unlock(&trace_types_lock); |
fd994989 | 2031 | |
1473e441 SR |
2032 | return 0; |
2033 | } | |
315326c1 | 2034 | |
836d481e ON |
2035 | static struct notifier_block trace_module_nb = { |
2036 | .notifier_call = trace_module_notify, | |
3673b8e4 | 2037 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 2038 | }; |
61f919a1 | 2039 | #endif /* CONFIG_MODULES */ |
1473e441 | 2040 | |
ae63b31e SR |
2041 | /* Create a new event directory structure for a trace directory. */ |
2042 | static void | |
2043 | __trace_add_event_dirs(struct trace_array *tr) | |
2044 | { | |
ae63b31e SR |
2045 | struct ftrace_event_call *call; |
2046 | int ret; | |
2047 | ||
2048 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 2049 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 2050 | if (ret < 0) |
3448bac3 FF |
2051 | pr_warn("Could not create directory for event %s\n", |
2052 | ftrace_event_name(call)); | |
ae63b31e SR |
2053 | } |
2054 | } | |
2055 | ||
7862ad18 | 2056 | struct ftrace_event_file * |
3cd715de SRRH |
2057 | find_event_file(struct trace_array *tr, const char *system, const char *event) |
2058 | { | |
2059 | struct ftrace_event_file *file; | |
2060 | struct ftrace_event_call *call; | |
de7b2973 | 2061 | const char *name; |
3cd715de SRRH |
2062 | |
2063 | list_for_each_entry(file, &tr->events, list) { | |
2064 | ||
2065 | call = file->event_call; | |
de7b2973 | 2066 | name = ftrace_event_name(call); |
3cd715de | 2067 | |
de7b2973 | 2068 | if (!name || !call->class || !call->class->reg) |
3cd715de SRRH |
2069 | continue; |
2070 | ||
2071 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2072 | continue; | |
2073 | ||
de7b2973 | 2074 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
2075 | strcmp(system, call->class->system) == 0) |
2076 | return file; | |
2077 | } | |
2078 | return NULL; | |
2079 | } | |
2080 | ||
2875a08b SRRH |
2081 | #ifdef CONFIG_DYNAMIC_FTRACE |
2082 | ||
2083 | /* Avoid typos */ | |
2084 | #define ENABLE_EVENT_STR "enable_event" | |
2085 | #define DISABLE_EVENT_STR "disable_event" | |
2086 | ||
2087 | struct event_probe_data { | |
2088 | struct ftrace_event_file *file; | |
2089 | unsigned long count; | |
2090 | int ref; | |
2091 | bool enable; | |
2092 | }; | |
2093 | ||
3cd715de SRRH |
2094 | static void |
2095 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2096 | { | |
2097 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2098 | struct event_probe_data *data = *pdata; | |
2099 | ||
2100 | if (!data) | |
2101 | return; | |
2102 | ||
2103 | if (data->enable) | |
2104 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2105 | else | |
2106 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2107 | } | |
2108 | ||
2109 | static void | |
2110 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2111 | { | |
2112 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2113 | struct event_probe_data *data = *pdata; | |
2114 | ||
2115 | if (!data) | |
2116 | return; | |
2117 | ||
2118 | if (!data->count) | |
2119 | return; | |
2120 | ||
2121 | /* Skip if the event is in a state we want to switch to */ | |
2122 | if (data->enable == !(data->file->flags & FTRACE_EVENT_FL_SOFT_DISABLED)) | |
2123 | return; | |
2124 | ||
2125 | if (data->count != -1) | |
2126 | (data->count)--; | |
2127 | ||
2128 | event_enable_probe(ip, parent_ip, _data); | |
2129 | } | |
2130 | ||
2131 | static int | |
2132 | event_enable_print(struct seq_file *m, unsigned long ip, | |
2133 | struct ftrace_probe_ops *ops, void *_data) | |
2134 | { | |
2135 | struct event_probe_data *data = _data; | |
2136 | ||
2137 | seq_printf(m, "%ps:", (void *)ip); | |
2138 | ||
2139 | seq_printf(m, "%s:%s:%s", | |
2140 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, | |
2141 | data->file->event_call->class->system, | |
de7b2973 | 2142 | ftrace_event_name(data->file->event_call)); |
3cd715de SRRH |
2143 | |
2144 | if (data->count == -1) | |
fa6f0cc7 | 2145 | seq_puts(m, ":unlimited\n"); |
3cd715de SRRH |
2146 | else |
2147 | seq_printf(m, ":count=%ld\n", data->count); | |
2148 | ||
2149 | return 0; | |
2150 | } | |
2151 | ||
2152 | static int | |
2153 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, | |
2154 | void **_data) | |
2155 | { | |
2156 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2157 | struct event_probe_data *data = *pdata; | |
2158 | ||
2159 | data->ref++; | |
2160 | return 0; | |
2161 | } | |
2162 | ||
2163 | static void | |
2164 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, | |
2165 | void **_data) | |
2166 | { | |
2167 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2168 | struct event_probe_data *data = *pdata; | |
2169 | ||
2170 | if (WARN_ON_ONCE(data->ref <= 0)) | |
2171 | return; | |
2172 | ||
2173 | data->ref--; | |
2174 | if (!data->ref) { | |
2175 | /* Remove the SOFT_MODE flag */ | |
2176 | __ftrace_event_enable_disable(data->file, 0, 1); | |
2177 | module_put(data->file->event_call->mod); | |
2178 | kfree(data); | |
2179 | } | |
2180 | *pdata = NULL; | |
2181 | } | |
2182 | ||
2183 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2184 | .func = event_enable_probe, | |
2185 | .print = event_enable_print, | |
2186 | .init = event_enable_init, | |
2187 | .free = event_enable_free, | |
2188 | }; | |
2189 | ||
2190 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
2191 | .func = event_enable_count_probe, | |
2192 | .print = event_enable_print, | |
2193 | .init = event_enable_init, | |
2194 | .free = event_enable_free, | |
2195 | }; | |
2196 | ||
2197 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
2198 | .func = event_enable_probe, | |
2199 | .print = event_enable_print, | |
2200 | .init = event_enable_init, | |
2201 | .free = event_enable_free, | |
2202 | }; | |
2203 | ||
2204 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2205 | .func = event_enable_count_probe, | |
2206 | .print = event_enable_print, | |
2207 | .init = event_enable_init, | |
2208 | .free = event_enable_free, | |
2209 | }; | |
2210 | ||
2211 | static int | |
2212 | event_enable_func(struct ftrace_hash *hash, | |
2213 | char *glob, char *cmd, char *param, int enabled) | |
2214 | { | |
2215 | struct trace_array *tr = top_trace_array(); | |
2216 | struct ftrace_event_file *file; | |
2217 | struct ftrace_probe_ops *ops; | |
2218 | struct event_probe_data *data; | |
2219 | const char *system; | |
2220 | const char *event; | |
2221 | char *number; | |
2222 | bool enable; | |
2223 | int ret; | |
2224 | ||
dc81e5e3 YY |
2225 | if (!tr) |
2226 | return -ENODEV; | |
2227 | ||
3cd715de | 2228 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 2229 | if (!enabled || !param) |
3cd715de SRRH |
2230 | return -EINVAL; |
2231 | ||
2232 | system = strsep(¶m, ":"); | |
2233 | if (!param) | |
2234 | return -EINVAL; | |
2235 | ||
2236 | event = strsep(¶m, ":"); | |
2237 | ||
2238 | mutex_lock(&event_mutex); | |
2239 | ||
2240 | ret = -EINVAL; | |
2241 | file = find_event_file(tr, system, event); | |
2242 | if (!file) | |
2243 | goto out; | |
2244 | ||
2245 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2246 | ||
2247 | if (enable) | |
2248 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2249 | else | |
2250 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2251 | ||
2252 | if (glob[0] == '!') { | |
2253 | unregister_ftrace_function_probe_func(glob+1, ops); | |
2254 | ret = 0; | |
2255 | goto out; | |
2256 | } | |
2257 | ||
2258 | ret = -ENOMEM; | |
2259 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2260 | if (!data) | |
2261 | goto out; | |
2262 | ||
2263 | data->enable = enable; | |
2264 | data->count = -1; | |
2265 | data->file = file; | |
2266 | ||
2267 | if (!param) | |
2268 | goto out_reg; | |
2269 | ||
2270 | number = strsep(¶m, ":"); | |
2271 | ||
2272 | ret = -EINVAL; | |
2273 | if (!strlen(number)) | |
2274 | goto out_free; | |
2275 | ||
2276 | /* | |
2277 | * We use the callback data field (which is a pointer) | |
2278 | * as our counter. | |
2279 | */ | |
2280 | ret = kstrtoul(number, 0, &data->count); | |
2281 | if (ret) | |
2282 | goto out_free; | |
2283 | ||
2284 | out_reg: | |
2285 | /* Don't let event modules unload while probe registered */ | |
2286 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2287 | if (!ret) { |
2288 | ret = -EBUSY; | |
3cd715de | 2289 | goto out_free; |
6ed01066 | 2290 | } |
3cd715de SRRH |
2291 | |
2292 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2293 | if (ret < 0) | |
2294 | goto out_put; | |
2295 | ret = register_ftrace_function_probe(glob, ops, data); | |
ff305ded SRRH |
2296 | /* |
2297 | * The above returns on success the # of functions enabled, | |
2298 | * but if it didn't find any functions it returns zero. | |
2299 | * Consider no functions a failure too. | |
2300 | */ | |
a5b85bd1 MH |
2301 | if (!ret) { |
2302 | ret = -ENOENT; | |
3cd715de | 2303 | goto out_disable; |
ff305ded SRRH |
2304 | } else if (ret < 0) |
2305 | goto out_disable; | |
2306 | /* Just return zero, not the number of enabled functions */ | |
2307 | ret = 0; | |
3cd715de SRRH |
2308 | out: |
2309 | mutex_unlock(&event_mutex); | |
2310 | return ret; | |
2311 | ||
2312 | out_disable: | |
2313 | __ftrace_event_enable_disable(file, 0, 1); | |
2314 | out_put: | |
2315 | module_put(file->event_call->mod); | |
2316 | out_free: | |
2317 | kfree(data); | |
2318 | goto out; | |
2319 | } | |
2320 | ||
2321 | static struct ftrace_func_command event_enable_cmd = { | |
2322 | .name = ENABLE_EVENT_STR, | |
2323 | .func = event_enable_func, | |
2324 | }; | |
2325 | ||
2326 | static struct ftrace_func_command event_disable_cmd = { | |
2327 | .name = DISABLE_EVENT_STR, | |
2328 | .func = event_enable_func, | |
2329 | }; | |
2330 | ||
2331 | static __init int register_event_cmds(void) | |
2332 | { | |
2333 | int ret; | |
2334 | ||
2335 | ret = register_ftrace_command(&event_enable_cmd); | |
2336 | if (WARN_ON(ret < 0)) | |
2337 | return ret; | |
2338 | ret = register_ftrace_command(&event_disable_cmd); | |
2339 | if (WARN_ON(ret < 0)) | |
2340 | unregister_ftrace_command(&event_enable_cmd); | |
2341 | return ret; | |
2342 | } | |
2343 | #else | |
2344 | static inline int register_event_cmds(void) { return 0; } | |
2345 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2346 | ||
77248221 SR |
2347 | /* |
2348 | * The top level array has already had its ftrace_event_file | |
2349 | * descriptors created in order to allow for early events to | |
2350 | * be recorded. This function is called after the debugfs has been | |
2351 | * initialized, and we now have to create the files associated | |
2352 | * to the events. | |
2353 | */ | |
2354 | static __init void | |
2355 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2356 | { | |
2357 | struct ftrace_event_file *file; | |
2358 | int ret; | |
2359 | ||
2360 | ||
2361 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 2362 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 2363 | if (ret < 0) |
3448bac3 FF |
2364 | pr_warn("Could not create directory for event %s\n", |
2365 | ftrace_event_name(file->event_call)); | |
77248221 SR |
2366 | } |
2367 | } | |
2368 | ||
2369 | /* | |
2370 | * For early boot up, the top trace array requires to have | |
2371 | * a list of events that can be enabled. This must be done before | |
2372 | * the filesystem is set up in order to allow events to be traced | |
2373 | * early. | |
2374 | */ | |
2375 | static __init void | |
2376 | __trace_early_add_events(struct trace_array *tr) | |
2377 | { | |
2378 | struct ftrace_event_call *call; | |
2379 | int ret; | |
2380 | ||
2381 | list_for_each_entry(call, &ftrace_events, list) { | |
2382 | /* Early boot up should not have any modules loaded */ | |
2383 | if (WARN_ON_ONCE(call->mod)) | |
2384 | continue; | |
2385 | ||
2386 | ret = __trace_early_add_new_event(call, tr); | |
2387 | if (ret < 0) | |
3448bac3 FF |
2388 | pr_warn("Could not create early event %s\n", |
2389 | ftrace_event_name(call)); | |
77248221 SR |
2390 | } |
2391 | } | |
2392 | ||
0c8916c3 SR |
2393 | /* Remove the event directory structure for a trace directory. */ |
2394 | static void | |
2395 | __trace_remove_event_dirs(struct trace_array *tr) | |
2396 | { | |
2397 | struct ftrace_event_file *file, *next; | |
2398 | ||
f6a84bdc ON |
2399 | list_for_each_entry_safe(file, next, &tr->events, list) |
2400 | remove_event_file_dir(file); | |
0c8916c3 SR |
2401 | } |
2402 | ||
779c5e37 | 2403 | static void __add_event_to_tracers(struct ftrace_event_call *call) |
ae63b31e SR |
2404 | { |
2405 | struct trace_array *tr; | |
2406 | ||
620a30e9 ON |
2407 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
2408 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
2409 | } |
2410 | ||
e4a9ea5e SR |
2411 | extern struct ftrace_event_call *__start_ftrace_events[]; |
2412 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2413 | |
020e5f85 LZ |
2414 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2415 | ||
2416 | static __init int setup_trace_event(char *str) | |
2417 | { | |
2418 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2419 | ring_buffer_expanded = true; |
2420 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2421 | |
2422 | return 1; | |
2423 | } | |
2424 | __setup("trace_event=", setup_trace_event); | |
2425 | ||
77248221 SR |
2426 | /* Expects to have event_mutex held when called */ |
2427 | static int | |
2428 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2429 | { |
2430 | struct dentry *d_events; | |
2431 | struct dentry *entry; | |
2432 | ||
2433 | entry = debugfs_create_file("set_event", 0644, parent, | |
2434 | tr, &ftrace_set_event_fops); | |
2435 | if (!entry) { | |
3448bac3 | 2436 | pr_warn("Could not create debugfs 'set_event' entry\n"); |
ae63b31e SR |
2437 | return -ENOMEM; |
2438 | } | |
2439 | ||
2440 | d_events = debugfs_create_dir("events", parent); | |
277ba044 | 2441 | if (!d_events) { |
3448bac3 | 2442 | pr_warn("Could not create debugfs 'events' directory\n"); |
277ba044 SR |
2443 | return -ENOMEM; |
2444 | } | |
ae63b31e SR |
2445 | |
2446 | /* ring buffer internal formats */ | |
2447 | trace_create_file("header_page", 0444, d_events, | |
2448 | ring_buffer_print_page_header, | |
2449 | &ftrace_show_header_fops); | |
2450 | ||
2451 | trace_create_file("header_event", 0444, d_events, | |
2452 | ring_buffer_print_entry_header, | |
2453 | &ftrace_show_header_fops); | |
2454 | ||
2455 | trace_create_file("enable", 0644, d_events, | |
2456 | tr, &ftrace_tr_enable_fops); | |
2457 | ||
2458 | tr->event_dir = d_events; | |
77248221 SR |
2459 | |
2460 | return 0; | |
2461 | } | |
2462 | ||
2463 | /** | |
2464 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2465 | * @parent: The parent dentry to place the files/directories for events in | |
2466 | * @tr: The trace array associated with these events | |
2467 | * | |
2468 | * When a new instance is created, it needs to set up its events | |
2469 | * directory, as well as other files associated with events. It also | |
2470 | * creates the event hierachry in the @parent/events directory. | |
2471 | * | |
2472 | * Returns 0 on success. | |
2473 | */ | |
2474 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2475 | { | |
2476 | int ret; | |
2477 | ||
2478 | mutex_lock(&event_mutex); | |
2479 | ||
2480 | ret = create_event_toplevel_files(parent, tr); | |
2481 | if (ret) | |
2482 | goto out_unlock; | |
2483 | ||
52f6ad6d | 2484 | down_write(&trace_event_sem); |
ae63b31e | 2485 | __trace_add_event_dirs(tr); |
52f6ad6d | 2486 | up_write(&trace_event_sem); |
277ba044 | 2487 | |
77248221 | 2488 | out_unlock: |
277ba044 | 2489 | mutex_unlock(&event_mutex); |
ae63b31e | 2490 | |
77248221 SR |
2491 | return ret; |
2492 | } | |
2493 | ||
2494 | /* | |
2495 | * The top trace array already had its file descriptors created. | |
2496 | * Now the files themselves need to be created. | |
2497 | */ | |
2498 | static __init int | |
2499 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2500 | { | |
2501 | int ret; | |
2502 | ||
2503 | mutex_lock(&event_mutex); | |
2504 | ||
2505 | ret = create_event_toplevel_files(parent, tr); | |
2506 | if (ret) | |
2507 | goto out_unlock; | |
2508 | ||
52f6ad6d | 2509 | down_write(&trace_event_sem); |
77248221 | 2510 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 2511 | up_write(&trace_event_sem); |
77248221 SR |
2512 | |
2513 | out_unlock: | |
2514 | mutex_unlock(&event_mutex); | |
2515 | ||
2516 | return ret; | |
ae63b31e SR |
2517 | } |
2518 | ||
0c8916c3 SR |
2519 | int event_trace_del_tracer(struct trace_array *tr) |
2520 | { | |
0c8916c3 SR |
2521 | mutex_lock(&event_mutex); |
2522 | ||
85f2b082 TZ |
2523 | /* Disable any event triggers and associated soft-disabled events */ |
2524 | clear_event_triggers(tr); | |
2525 | ||
2a6c24af SRRH |
2526 | /* Disable any running events */ |
2527 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
2528 | ||
3ccb0123 SR |
2529 | /* Access to events are within rcu_read_lock_sched() */ |
2530 | synchronize_sched(); | |
2531 | ||
52f6ad6d | 2532 | down_write(&trace_event_sem); |
0c8916c3 SR |
2533 | __trace_remove_event_dirs(tr); |
2534 | debugfs_remove_recursive(tr->event_dir); | |
52f6ad6d | 2535 | up_write(&trace_event_sem); |
0c8916c3 SR |
2536 | |
2537 | tr->event_dir = NULL; | |
2538 | ||
2539 | mutex_unlock(&event_mutex); | |
2540 | ||
2541 | return 0; | |
2542 | } | |
2543 | ||
d1a29143 SR |
2544 | static __init int event_trace_memsetup(void) |
2545 | { | |
2546 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
2547 | file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC); | |
2548 | return 0; | |
2549 | } | |
2550 | ||
ce1039bd SRRH |
2551 | static __init void |
2552 | early_enable_events(struct trace_array *tr, bool disable_first) | |
2553 | { | |
2554 | char *buf = bootup_event_buf; | |
2555 | char *token; | |
2556 | int ret; | |
2557 | ||
2558 | while (true) { | |
2559 | token = strsep(&buf, ","); | |
2560 | ||
2561 | if (!token) | |
2562 | break; | |
2563 | if (!*token) | |
2564 | continue; | |
2565 | ||
2566 | /* Restarting syscalls requires that we stop them first */ | |
2567 | if (disable_first) | |
2568 | ftrace_set_clr_event(tr, token, 0); | |
2569 | ||
2570 | ret = ftrace_set_clr_event(tr, token, 1); | |
2571 | if (ret) | |
2572 | pr_warn("Failed to enable trace event: %s\n", token); | |
2573 | ||
2574 | /* Put back the comma to allow this to be called again */ | |
2575 | if (buf) | |
2576 | *(buf - 1) = ','; | |
2577 | } | |
2578 | } | |
2579 | ||
8781915a EG |
2580 | static __init int event_trace_enable(void) |
2581 | { | |
ae63b31e | 2582 | struct trace_array *tr = top_trace_array(); |
8781915a | 2583 | struct ftrace_event_call **iter, *call; |
8781915a EG |
2584 | int ret; |
2585 | ||
dc81e5e3 YY |
2586 | if (!tr) |
2587 | return -ENODEV; | |
2588 | ||
8781915a EG |
2589 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
2590 | ||
2591 | call = *iter; | |
2592 | ret = event_init(call); | |
2593 | if (!ret) | |
2594 | list_add(&call->list, &ftrace_events); | |
2595 | } | |
2596 | ||
77248221 SR |
2597 | /* |
2598 | * We need the top trace array to have a working set of trace | |
2599 | * points at early init, before the debug files and directories | |
2600 | * are created. Create the file entries now, and attach them | |
2601 | * to the actual file dentries later. | |
2602 | */ | |
2603 | __trace_early_add_events(tr); | |
2604 | ||
ce1039bd | 2605 | early_enable_events(tr, false); |
81698831 SR |
2606 | |
2607 | trace_printk_start_comm(); | |
2608 | ||
3cd715de SRRH |
2609 | register_event_cmds(); |
2610 | ||
85f2b082 TZ |
2611 | register_trigger_cmds(); |
2612 | ||
8781915a EG |
2613 | return 0; |
2614 | } | |
2615 | ||
ce1039bd SRRH |
2616 | /* |
2617 | * event_trace_enable() is called from trace_event_init() first to | |
2618 | * initialize events and perhaps start any events that are on the | |
2619 | * command line. Unfortunately, there are some events that will not | |
2620 | * start this early, like the system call tracepoints that need | |
2621 | * to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable() | |
2622 | * is called before pid 1 starts, and this flag is never set, making | |
2623 | * the syscall tracepoint never get reached, but the event is enabled | |
2624 | * regardless (and not doing anything). | |
2625 | */ | |
2626 | static __init int event_trace_enable_again(void) | |
2627 | { | |
2628 | struct trace_array *tr; | |
2629 | ||
2630 | tr = top_trace_array(); | |
2631 | if (!tr) | |
2632 | return -ENODEV; | |
2633 | ||
2634 | early_enable_events(tr, true); | |
2635 | ||
2636 | return 0; | |
2637 | } | |
2638 | ||
2639 | early_initcall(event_trace_enable_again); | |
2640 | ||
b77e38aa SR |
2641 | static __init int event_trace_init(void) |
2642 | { | |
ae63b31e | 2643 | struct trace_array *tr; |
b77e38aa SR |
2644 | struct dentry *d_tracer; |
2645 | struct dentry *entry; | |
6d723736 | 2646 | int ret; |
b77e38aa | 2647 | |
ae63b31e | 2648 | tr = top_trace_array(); |
dc81e5e3 YY |
2649 | if (!tr) |
2650 | return -ENODEV; | |
ae63b31e | 2651 | |
b77e38aa | 2652 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 2653 | if (IS_ERR(d_tracer)) |
b77e38aa SR |
2654 | return 0; |
2655 | ||
2314c4ae | 2656 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 2657 | tr, &ftrace_avail_fops); |
2314c4ae | 2658 | if (!entry) |
3448bac3 | 2659 | pr_warn("Could not create debugfs 'available_events' entry\n"); |
2314c4ae | 2660 | |
8728fe50 | 2661 | if (trace_define_common_fields()) |
3448bac3 | 2662 | pr_warn("tracing: Failed to allocate common fields"); |
8728fe50 | 2663 | |
77248221 | 2664 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
2665 | if (ret) |
2666 | return ret; | |
020e5f85 | 2667 | |
836d481e | 2668 | #ifdef CONFIG_MODULES |
6d723736 | 2669 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 2670 | if (ret) |
3448bac3 | 2671 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 2672 | #endif |
b77e38aa SR |
2673 | return 0; |
2674 | } | |
5f893b26 SRRH |
2675 | |
2676 | void __init trace_event_init(void) | |
2677 | { | |
2678 | event_trace_memsetup(); | |
2679 | init_ftrace_syscalls(); | |
2680 | event_trace_enable(); | |
2681 | } | |
2682 | ||
b77e38aa | 2683 | fs_initcall(event_trace_init); |
e6187007 SR |
2684 | |
2685 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
2686 | ||
2687 | static DEFINE_SPINLOCK(test_spinlock); | |
2688 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
2689 | static DEFINE_MUTEX(test_mutex); | |
2690 | ||
2691 | static __init void test_work(struct work_struct *dummy) | |
2692 | { | |
2693 | spin_lock(&test_spinlock); | |
2694 | spin_lock_irq(&test_spinlock_irq); | |
2695 | udelay(1); | |
2696 | spin_unlock_irq(&test_spinlock_irq); | |
2697 | spin_unlock(&test_spinlock); | |
2698 | ||
2699 | mutex_lock(&test_mutex); | |
2700 | msleep(1); | |
2701 | mutex_unlock(&test_mutex); | |
2702 | } | |
2703 | ||
2704 | static __init int event_test_thread(void *unused) | |
2705 | { | |
2706 | void *test_malloc; | |
2707 | ||
2708 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
2709 | if (!test_malloc) | |
2710 | pr_info("failed to kmalloc\n"); | |
2711 | ||
2712 | schedule_on_each_cpu(test_work); | |
2713 | ||
2714 | kfree(test_malloc); | |
2715 | ||
2716 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 2717 | while (!kthread_should_stop()) { |
e6187007 | 2718 | schedule(); |
fe0e01c7 PZ |
2719 | set_current_state(TASK_INTERRUPTIBLE); |
2720 | } | |
2721 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
2722 | |
2723 | return 0; | |
2724 | } | |
2725 | ||
2726 | /* | |
2727 | * Do various things that may trigger events. | |
2728 | */ | |
2729 | static __init void event_test_stuff(void) | |
2730 | { | |
2731 | struct task_struct *test_thread; | |
2732 | ||
2733 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
2734 | msleep(1); | |
2735 | kthread_stop(test_thread); | |
2736 | } | |
2737 | ||
2738 | /* | |
2739 | * For every trace event defined, we will test each trace point separately, | |
2740 | * and then by groups, and finally all trace points. | |
2741 | */ | |
9ea21c1e | 2742 | static __init void event_trace_self_tests(void) |
e6187007 | 2743 | { |
ae63b31e SR |
2744 | struct ftrace_subsystem_dir *dir; |
2745 | struct ftrace_event_file *file; | |
e6187007 SR |
2746 | struct ftrace_event_call *call; |
2747 | struct event_subsystem *system; | |
ae63b31e | 2748 | struct trace_array *tr; |
e6187007 SR |
2749 | int ret; |
2750 | ||
ae63b31e | 2751 | tr = top_trace_array(); |
dc81e5e3 YY |
2752 | if (!tr) |
2753 | return; | |
ae63b31e | 2754 | |
e6187007 SR |
2755 | pr_info("Running tests on trace events:\n"); |
2756 | ||
ae63b31e SR |
2757 | list_for_each_entry(file, &tr->events, list) { |
2758 | ||
2759 | call = file->event_call; | |
e6187007 | 2760 | |
2239291a SR |
2761 | /* Only test those that have a probe */ |
2762 | if (!call->class || !call->class->probe) | |
e6187007 SR |
2763 | continue; |
2764 | ||
1f5a6b45 SR |
2765 | /* |
2766 | * Testing syscall events here is pretty useless, but | |
2767 | * we still do it if configured. But this is time consuming. | |
2768 | * What we really need is a user thread to perform the | |
2769 | * syscalls as we test. | |
2770 | */ | |
2771 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
2772 | if (call->class->system && |
2773 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
2774 | continue; |
2775 | #endif | |
2776 | ||
de7b2973 | 2777 | pr_info("Testing event %s: ", ftrace_event_name(call)); |
e6187007 SR |
2778 | |
2779 | /* | |
2780 | * If an event is already enabled, someone is using | |
2781 | * it and the self test should not be on. | |
2782 | */ | |
ae63b31e | 2783 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
3448bac3 | 2784 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
2785 | WARN_ON_ONCE(1); |
2786 | continue; | |
2787 | } | |
2788 | ||
ae63b31e | 2789 | ftrace_event_enable_disable(file, 1); |
e6187007 | 2790 | event_test_stuff(); |
ae63b31e | 2791 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
2792 | |
2793 | pr_cont("OK\n"); | |
2794 | } | |
2795 | ||
2796 | /* Now test at the sub system level */ | |
2797 | ||
2798 | pr_info("Running tests on trace event systems:\n"); | |
2799 | ||
ae63b31e SR |
2800 | list_for_each_entry(dir, &tr->systems, list) { |
2801 | ||
2802 | system = dir->subsystem; | |
e6187007 SR |
2803 | |
2804 | /* the ftrace system is special, skip it */ | |
2805 | if (strcmp(system->name, "ftrace") == 0) | |
2806 | continue; | |
2807 | ||
2808 | pr_info("Testing event system %s: ", system->name); | |
2809 | ||
ae63b31e | 2810 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 2811 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
2812 | pr_warn("error enabling system %s\n", |
2813 | system->name); | |
e6187007 SR |
2814 | continue; |
2815 | } | |
2816 | ||
2817 | event_test_stuff(); | |
2818 | ||
ae63b31e | 2819 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 2820 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
2821 | pr_warn("error disabling system %s\n", |
2822 | system->name); | |
76bab1b7 YL |
2823 | continue; |
2824 | } | |
e6187007 SR |
2825 | |
2826 | pr_cont("OK\n"); | |
2827 | } | |
2828 | ||
2829 | /* Test with all events enabled */ | |
2830 | ||
2831 | pr_info("Running tests on all trace events:\n"); | |
2832 | pr_info("Testing all events: "); | |
2833 | ||
ae63b31e | 2834 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 2835 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 2836 | pr_warn("error enabling all events\n"); |
9ea21c1e | 2837 | return; |
e6187007 SR |
2838 | } |
2839 | ||
2840 | event_test_stuff(); | |
2841 | ||
2842 | /* reset sysname */ | |
ae63b31e | 2843 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 2844 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 2845 | pr_warn("error disabling all events\n"); |
9ea21c1e | 2846 | return; |
e6187007 SR |
2847 | } |
2848 | ||
2849 | pr_cont("OK\n"); | |
9ea21c1e SR |
2850 | } |
2851 | ||
2852 | #ifdef CONFIG_FUNCTION_TRACER | |
2853 | ||
245b2e70 | 2854 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
2855 | |
2856 | static void | |
2f5f6ad9 | 2857 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 2858 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
2859 | { |
2860 | struct ring_buffer_event *event; | |
e77405ad | 2861 | struct ring_buffer *buffer; |
9ea21c1e SR |
2862 | struct ftrace_entry *entry; |
2863 | unsigned long flags; | |
2864 | long disabled; | |
9ea21c1e SR |
2865 | int cpu; |
2866 | int pc; | |
2867 | ||
2868 | pc = preempt_count(); | |
5168ae50 | 2869 | preempt_disable_notrace(); |
9ea21c1e | 2870 | cpu = raw_smp_processor_id(); |
245b2e70 | 2871 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
2872 | |
2873 | if (disabled != 1) | |
2874 | goto out; | |
2875 | ||
2876 | local_save_flags(flags); | |
2877 | ||
e77405ad SR |
2878 | event = trace_current_buffer_lock_reserve(&buffer, |
2879 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
2880 | flags, pc); |
2881 | if (!event) | |
2882 | goto out; | |
2883 | entry = ring_buffer_event_data(event); | |
2884 | entry->ip = ip; | |
2885 | entry->parent_ip = parent_ip; | |
2886 | ||
0d5c6e1c | 2887 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
2888 | |
2889 | out: | |
245b2e70 | 2890 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 2891 | preempt_enable_notrace(); |
9ea21c1e SR |
2892 | } |
2893 | ||
2894 | static struct ftrace_ops trace_ops __initdata = | |
2895 | { | |
2896 | .func = function_test_events_call, | |
4740974a | 2897 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
2898 | }; |
2899 | ||
2900 | static __init void event_trace_self_test_with_function(void) | |
2901 | { | |
17bb615a SR |
2902 | int ret; |
2903 | ret = register_ftrace_function(&trace_ops); | |
2904 | if (WARN_ON(ret < 0)) { | |
2905 | pr_info("Failed to enable function tracer for event tests\n"); | |
2906 | return; | |
2907 | } | |
9ea21c1e SR |
2908 | pr_info("Running tests again, along with the function tracer\n"); |
2909 | event_trace_self_tests(); | |
2910 | unregister_ftrace_function(&trace_ops); | |
2911 | } | |
2912 | #else | |
2913 | static __init void event_trace_self_test_with_function(void) | |
2914 | { | |
2915 | } | |
2916 | #endif | |
2917 | ||
2918 | static __init int event_trace_self_tests_init(void) | |
2919 | { | |
020e5f85 LZ |
2920 | if (!tracing_selftest_disabled) { |
2921 | event_trace_self_tests(); | |
2922 | event_trace_self_test_with_function(); | |
2923 | } | |
e6187007 SR |
2924 | |
2925 | return 0; | |
2926 | } | |
2927 | ||
28d20e2d | 2928 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
2929 | |
2930 | #endif |