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; |
84fce9db | 568 | int ret; |
b628b3e6 SR |
569 | |
570 | /* | |
571 | * The buf format can be <subsystem>:<event-name> | |
572 | * *:<event-name> means any event by that name. | |
573 | * :<event-name> is the same. | |
574 | * | |
575 | * <subsystem>:* means all events in that subsystem | |
576 | * <subsystem>: means the same. | |
577 | * | |
578 | * <name> (no ':') means all events in a subsystem with | |
579 | * the name <name> or any event that matches <name> | |
580 | */ | |
581 | ||
582 | match = strsep(&buf, ":"); | |
583 | if (buf) { | |
584 | sub = match; | |
585 | event = buf; | |
586 | match = NULL; | |
587 | ||
588 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
589 | sub = NULL; | |
590 | if (!strlen(event) || strcmp(event, "*") == 0) | |
591 | event = NULL; | |
592 | } | |
b77e38aa | 593 | |
84fce9db JK |
594 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
595 | ||
596 | /* Put back the colon to allow this to be called again */ | |
597 | if (buf) | |
598 | *(buf - 1) = ':'; | |
599 | ||
600 | return ret; | |
b77e38aa SR |
601 | } |
602 | ||
4671c794 SR |
603 | /** |
604 | * trace_set_clr_event - enable or disable an event | |
605 | * @system: system name to match (NULL for any system) | |
606 | * @event: event name to match (NULL for all events, within system) | |
607 | * @set: 1 to enable, 0 to disable | |
608 | * | |
609 | * This is a way for other parts of the kernel to enable or disable | |
610 | * event recording. | |
611 | * | |
612 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
613 | * registered events. | |
614 | */ | |
615 | int trace_set_clr_event(const char *system, const char *event, int set) | |
616 | { | |
ae63b31e SR |
617 | struct trace_array *tr = top_trace_array(); |
618 | ||
dc81e5e3 YY |
619 | if (!tr) |
620 | return -ENODEV; | |
621 | ||
ae63b31e | 622 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 623 | } |
56355b83 | 624 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 625 | |
b77e38aa SR |
626 | /* 128 should be much more than enough */ |
627 | #define EVENT_BUF_SIZE 127 | |
628 | ||
629 | static ssize_t | |
630 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
631 | size_t cnt, loff_t *ppos) | |
632 | { | |
48966364 | 633 | struct trace_parser parser; |
ae63b31e SR |
634 | struct seq_file *m = file->private_data; |
635 | struct trace_array *tr = m->private; | |
4ba7978e | 636 | ssize_t read, ret; |
b77e38aa | 637 | |
4ba7978e | 638 | if (!cnt) |
b77e38aa SR |
639 | return 0; |
640 | ||
1852fcce SR |
641 | ret = tracing_update_buffers(); |
642 | if (ret < 0) | |
643 | return ret; | |
644 | ||
48966364 | 645 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
646 | return -ENOMEM; |
647 | ||
48966364 | 648 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
649 | ||
4ba7978e | 650 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 651 | int set = 1; |
b77e38aa | 652 | |
48966364 | 653 | if (*parser.buffer == '!') |
b77e38aa | 654 | set = 0; |
b77e38aa | 655 | |
48966364 | 656 | parser.buffer[parser.idx] = 0; |
657 | ||
ae63b31e | 658 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 659 | if (ret) |
48966364 | 660 | goto out_put; |
b77e38aa | 661 | } |
b77e38aa SR |
662 | |
663 | ret = read; | |
664 | ||
48966364 | 665 | out_put: |
666 | trace_parser_put(&parser); | |
b77e38aa SR |
667 | |
668 | return ret; | |
669 | } | |
670 | ||
671 | static void * | |
672 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
673 | { | |
ae63b31e SR |
674 | struct ftrace_event_file *file = v; |
675 | struct ftrace_event_call *call; | |
676 | struct trace_array *tr = m->private; | |
b77e38aa SR |
677 | |
678 | (*pos)++; | |
679 | ||
ae63b31e SR |
680 | list_for_each_entry_continue(file, &tr->events, list) { |
681 | call = file->event_call; | |
40e26815 SR |
682 | /* |
683 | * The ftrace subsystem is for showing formats only. | |
684 | * They can not be enabled or disabled via the event files. | |
685 | */ | |
a1d0ce82 | 686 | if (call->class && call->class->reg) |
ae63b31e | 687 | return file; |
40e26815 | 688 | } |
b77e38aa | 689 | |
30bd39cd | 690 | return NULL; |
b77e38aa SR |
691 | } |
692 | ||
693 | static void *t_start(struct seq_file *m, loff_t *pos) | |
694 | { | |
ae63b31e SR |
695 | struct ftrace_event_file *file; |
696 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
697 | loff_t l; |
698 | ||
20c8928a | 699 | mutex_lock(&event_mutex); |
e1c7e2a6 | 700 | |
ae63b31e | 701 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 702 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
703 | file = t_next(m, file, &l); |
704 | if (!file) | |
e1c7e2a6 LZ |
705 | break; |
706 | } | |
ae63b31e | 707 | return file; |
b77e38aa SR |
708 | } |
709 | ||
710 | static void * | |
711 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
712 | { | |
ae63b31e SR |
713 | struct ftrace_event_file *file = v; |
714 | struct trace_array *tr = m->private; | |
b77e38aa SR |
715 | |
716 | (*pos)++; | |
717 | ||
ae63b31e SR |
718 | list_for_each_entry_continue(file, &tr->events, list) { |
719 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
720 | return file; | |
b77e38aa SR |
721 | } |
722 | ||
30bd39cd | 723 | return NULL; |
b77e38aa SR |
724 | } |
725 | ||
726 | static void *s_start(struct seq_file *m, loff_t *pos) | |
727 | { | |
ae63b31e SR |
728 | struct ftrace_event_file *file; |
729 | struct trace_array *tr = m->private; | |
e1c7e2a6 LZ |
730 | loff_t l; |
731 | ||
20c8928a | 732 | mutex_lock(&event_mutex); |
e1c7e2a6 | 733 | |
ae63b31e | 734 | file = list_entry(&tr->events, struct ftrace_event_file, list); |
e1c7e2a6 | 735 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
736 | file = s_next(m, file, &l); |
737 | if (!file) | |
e1c7e2a6 LZ |
738 | break; |
739 | } | |
ae63b31e | 740 | return file; |
b77e38aa SR |
741 | } |
742 | ||
743 | static int t_show(struct seq_file *m, void *v) | |
744 | { | |
ae63b31e SR |
745 | struct ftrace_event_file *file = v; |
746 | struct ftrace_event_call *call = file->event_call; | |
b77e38aa | 747 | |
8f082018 SR |
748 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
749 | seq_printf(m, "%s:", call->class->system); | |
de7b2973 | 750 | seq_printf(m, "%s\n", ftrace_event_name(call)); |
b77e38aa SR |
751 | |
752 | return 0; | |
753 | } | |
754 | ||
755 | static void t_stop(struct seq_file *m, void *p) | |
756 | { | |
20c8928a | 757 | mutex_unlock(&event_mutex); |
b77e38aa SR |
758 | } |
759 | ||
1473e441 SR |
760 | static ssize_t |
761 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
762 | loff_t *ppos) | |
763 | { | |
bc6f6b08 ON |
764 | struct ftrace_event_file *file; |
765 | unsigned long flags; | |
a4390596 TZ |
766 | char buf[4] = "0"; |
767 | ||
bc6f6b08 ON |
768 | mutex_lock(&event_mutex); |
769 | file = event_file_data(filp); | |
770 | if (likely(file)) | |
771 | flags = file->flags; | |
772 | mutex_unlock(&event_mutex); | |
773 | ||
774 | if (!file) | |
775 | return -ENODEV; | |
776 | ||
777 | if (flags & FTRACE_EVENT_FL_ENABLED && | |
778 | !(flags & FTRACE_EVENT_FL_SOFT_DISABLED)) | |
a4390596 TZ |
779 | strcpy(buf, "1"); |
780 | ||
bc6f6b08 ON |
781 | if (flags & FTRACE_EVENT_FL_SOFT_DISABLED || |
782 | flags & FTRACE_EVENT_FL_SOFT_MODE) | |
a4390596 TZ |
783 | strcat(buf, "*"); |
784 | ||
785 | strcat(buf, "\n"); | |
1473e441 | 786 | |
417944c4 | 787 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
788 | } |
789 | ||
790 | static ssize_t | |
791 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
792 | loff_t *ppos) | |
793 | { | |
bc6f6b08 | 794 | struct ftrace_event_file *file; |
1473e441 SR |
795 | unsigned long val; |
796 | int ret; | |
797 | ||
22fe9b54 PH |
798 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
799 | if (ret) | |
1473e441 SR |
800 | return ret; |
801 | ||
1852fcce SR |
802 | ret = tracing_update_buffers(); |
803 | if (ret < 0) | |
804 | return ret; | |
805 | ||
1473e441 SR |
806 | switch (val) { |
807 | case 0: | |
1473e441 | 808 | case 1: |
bc6f6b08 | 809 | ret = -ENODEV; |
11a241a3 | 810 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
811 | file = event_file_data(filp); |
812 | if (likely(file)) | |
813 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 814 | mutex_unlock(&event_mutex); |
1473e441 SR |
815 | break; |
816 | ||
817 | default: | |
818 | return -EINVAL; | |
819 | } | |
820 | ||
821 | *ppos += cnt; | |
822 | ||
3b8e4273 | 823 | return ret ? ret : cnt; |
1473e441 SR |
824 | } |
825 | ||
8ae79a13 SR |
826 | static ssize_t |
827 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
828 | loff_t *ppos) | |
829 | { | |
c142b15d | 830 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
ae63b31e SR |
831 | struct ftrace_subsystem_dir *dir = filp->private_data; |
832 | struct event_subsystem *system = dir->subsystem; | |
8ae79a13 | 833 | struct ftrace_event_call *call; |
ae63b31e SR |
834 | struct ftrace_event_file *file; |
835 | struct trace_array *tr = dir->tr; | |
8ae79a13 | 836 | char buf[2]; |
c142b15d | 837 | int set = 0; |
8ae79a13 SR |
838 | int ret; |
839 | ||
8ae79a13 | 840 | mutex_lock(&event_mutex); |
ae63b31e SR |
841 | list_for_each_entry(file, &tr->events, list) { |
842 | call = file->event_call; | |
de7b2973 | 843 | if (!ftrace_event_name(call) || !call->class || !call->class->reg) |
8ae79a13 SR |
844 | continue; |
845 | ||
40ee4dff | 846 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
847 | continue; |
848 | ||
849 | /* | |
850 | * We need to find out if all the events are set | |
851 | * or if all events or cleared, or if we have | |
852 | * a mixture. | |
853 | */ | |
ae63b31e | 854 | set |= (1 << !!(file->flags & FTRACE_EVENT_FL_ENABLED)); |
c142b15d | 855 | |
8ae79a13 SR |
856 | /* |
857 | * If we have a mixture, no need to look further. | |
858 | */ | |
c142b15d | 859 | if (set == 3) |
8ae79a13 SR |
860 | break; |
861 | } | |
862 | mutex_unlock(&event_mutex); | |
863 | ||
c142b15d | 864 | buf[0] = set_to_char[set]; |
8ae79a13 | 865 | buf[1] = '\n'; |
8ae79a13 SR |
866 | |
867 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
868 | ||
869 | return ret; | |
870 | } | |
871 | ||
872 | static ssize_t | |
873 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
874 | loff_t *ppos) | |
875 | { | |
ae63b31e SR |
876 | struct ftrace_subsystem_dir *dir = filp->private_data; |
877 | struct event_subsystem *system = dir->subsystem; | |
40ee4dff | 878 | const char *name = NULL; |
8ae79a13 | 879 | unsigned long val; |
8ae79a13 SR |
880 | ssize_t ret; |
881 | ||
22fe9b54 PH |
882 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
883 | if (ret) | |
8ae79a13 SR |
884 | return ret; |
885 | ||
886 | ret = tracing_update_buffers(); | |
887 | if (ret < 0) | |
888 | return ret; | |
889 | ||
8f31bfe5 | 890 | if (val != 0 && val != 1) |
8ae79a13 | 891 | return -EINVAL; |
8ae79a13 | 892 | |
40ee4dff SR |
893 | /* |
894 | * Opening of "enable" adds a ref count to system, | |
895 | * so the name is safe to use. | |
896 | */ | |
897 | if (system) | |
898 | name = system->name; | |
899 | ||
ae63b31e | 900 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 901 | if (ret) |
8f31bfe5 | 902 | goto out; |
8ae79a13 SR |
903 | |
904 | ret = cnt; | |
905 | ||
8f31bfe5 | 906 | out: |
8ae79a13 SR |
907 | *ppos += cnt; |
908 | ||
909 | return ret; | |
910 | } | |
911 | ||
2a37a3df SR |
912 | enum { |
913 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
914 | FORMAT_FIELD_SEPERATOR = 2, |
915 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
916 | }; |
917 | ||
918 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 919 | { |
c5a44a12 | 920 | struct ftrace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
921 | struct list_head *common_head = &ftrace_common_fields; |
922 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 923 | struct list_head *node = v; |
981d081e | 924 | |
2a37a3df | 925 | (*pos)++; |
5a65e956 | 926 | |
2a37a3df SR |
927 | switch ((unsigned long)v) { |
928 | case FORMAT_HEADER: | |
7710b639 ON |
929 | node = common_head; |
930 | break; | |
5a65e956 | 931 | |
86397dc3 | 932 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
933 | node = head; |
934 | break; | |
5a65e956 | 935 | |
2a37a3df SR |
936 | case FORMAT_PRINTFMT: |
937 | /* all done */ | |
938 | return NULL; | |
5a65e956 LJ |
939 | } |
940 | ||
7710b639 ON |
941 | node = node->prev; |
942 | if (node == common_head) | |
86397dc3 | 943 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 944 | else if (node == head) |
2a37a3df | 945 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
946 | else |
947 | return node; | |
2a37a3df SR |
948 | } |
949 | ||
950 | static int f_show(struct seq_file *m, void *v) | |
951 | { | |
c5a44a12 | 952 | struct ftrace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
953 | struct ftrace_event_field *field; |
954 | const char *array_descriptor; | |
955 | ||
956 | switch ((unsigned long)v) { | |
957 | case FORMAT_HEADER: | |
de7b2973 | 958 | seq_printf(m, "name: %s\n", ftrace_event_name(call)); |
2a37a3df | 959 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 960 | seq_puts(m, "format:\n"); |
8728fe50 | 961 | return 0; |
5a65e956 | 962 | |
86397dc3 LZ |
963 | case FORMAT_FIELD_SEPERATOR: |
964 | seq_putc(m, '\n'); | |
965 | return 0; | |
966 | ||
2a37a3df SR |
967 | case FORMAT_PRINTFMT: |
968 | seq_printf(m, "\nprint fmt: %s\n", | |
969 | call->print_fmt); | |
970 | return 0; | |
981d081e | 971 | } |
8728fe50 | 972 | |
7710b639 | 973 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
974 | /* |
975 | * Smartly shows the array type(except dynamic array). | |
976 | * Normal: | |
977 | * field:TYPE VAR | |
978 | * If TYPE := TYPE[LEN], it is shown: | |
979 | * field:TYPE VAR[LEN] | |
980 | */ | |
981 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 982 | |
2a37a3df SR |
983 | if (!strncmp(field->type, "__data_loc", 10)) |
984 | array_descriptor = NULL; | |
8728fe50 | 985 | |
2a37a3df SR |
986 | if (!array_descriptor) |
987 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
988 | field->type, field->name, field->offset, | |
989 | field->size, !!field->is_signed); | |
990 | else | |
991 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
992 | (int)(array_descriptor - field->type), | |
993 | field->type, field->name, | |
994 | array_descriptor, field->offset, | |
995 | field->size, !!field->is_signed); | |
8728fe50 | 996 | |
2a37a3df SR |
997 | return 0; |
998 | } | |
5a65e956 | 999 | |
7710b639 ON |
1000 | static void *f_start(struct seq_file *m, loff_t *pos) |
1001 | { | |
1002 | void *p = (void *)FORMAT_HEADER; | |
1003 | loff_t l = 0; | |
1004 | ||
c5a44a12 ON |
1005 | /* ->stop() is called even if ->start() fails */ |
1006 | mutex_lock(&event_mutex); | |
1007 | if (!event_file_data(m->private)) | |
1008 | return ERR_PTR(-ENODEV); | |
1009 | ||
7710b639 ON |
1010 | while (l < *pos && p) |
1011 | p = f_next(m, p, &l); | |
1012 | ||
1013 | return p; | |
1014 | } | |
1015 | ||
2a37a3df SR |
1016 | static void f_stop(struct seq_file *m, void *p) |
1017 | { | |
c5a44a12 | 1018 | mutex_unlock(&event_mutex); |
2a37a3df | 1019 | } |
981d081e | 1020 | |
2a37a3df SR |
1021 | static const struct seq_operations trace_format_seq_ops = { |
1022 | .start = f_start, | |
1023 | .next = f_next, | |
1024 | .stop = f_stop, | |
1025 | .show = f_show, | |
1026 | }; | |
1027 | ||
1028 | static int trace_format_open(struct inode *inode, struct file *file) | |
1029 | { | |
2a37a3df SR |
1030 | struct seq_file *m; |
1031 | int ret; | |
1032 | ||
1033 | ret = seq_open(file, &trace_format_seq_ops); | |
1034 | if (ret < 0) | |
1035 | return ret; | |
1036 | ||
1037 | m = file->private_data; | |
c5a44a12 | 1038 | m->private = file; |
2a37a3df SR |
1039 | |
1040 | return 0; | |
981d081e SR |
1041 | } |
1042 | ||
23725aee PZ |
1043 | static ssize_t |
1044 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1045 | { | |
1a11126b | 1046 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1047 | char buf[32]; |
1048 | int len; | |
23725aee PZ |
1049 | |
1050 | if (*ppos) | |
1051 | return 0; | |
1052 | ||
1a11126b ON |
1053 | if (unlikely(!id)) |
1054 | return -ENODEV; | |
1055 | ||
1056 | len = sprintf(buf, "%d\n", id); | |
1057 | ||
cd458ba9 | 1058 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1059 | } |
1060 | ||
7ce7e424 TZ |
1061 | static ssize_t |
1062 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1063 | loff_t *ppos) | |
1064 | { | |
f306cc82 | 1065 | struct ftrace_event_file *file; |
7ce7e424 | 1066 | struct trace_seq *s; |
e2912b09 | 1067 | int r = -ENODEV; |
7ce7e424 TZ |
1068 | |
1069 | if (*ppos) | |
1070 | return 0; | |
1071 | ||
1072 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1073 | |
7ce7e424 TZ |
1074 | if (!s) |
1075 | return -ENOMEM; | |
1076 | ||
1077 | trace_seq_init(s); | |
1078 | ||
e2912b09 | 1079 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1080 | file = event_file_data(filp); |
1081 | if (file) | |
1082 | print_event_filter(file, s); | |
e2912b09 ON |
1083 | mutex_unlock(&event_mutex); |
1084 | ||
f306cc82 | 1085 | if (file) |
5ac48378 SRRH |
1086 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1087 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1088 | |
1089 | kfree(s); | |
1090 | ||
1091 | return r; | |
1092 | } | |
1093 | ||
1094 | static ssize_t | |
1095 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1096 | loff_t *ppos) | |
1097 | { | |
f306cc82 | 1098 | struct ftrace_event_file *file; |
8b372562 | 1099 | char *buf; |
e2912b09 | 1100 | int err = -ENODEV; |
7ce7e424 | 1101 | |
8b372562 | 1102 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1103 | return -EINVAL; |
1104 | ||
8b372562 TZ |
1105 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1106 | if (!buf) | |
7ce7e424 TZ |
1107 | return -ENOMEM; |
1108 | ||
8b372562 TZ |
1109 | if (copy_from_user(buf, ubuf, cnt)) { |
1110 | free_page((unsigned long) buf); | |
1111 | return -EFAULT; | |
7ce7e424 | 1112 | } |
8b372562 | 1113 | buf[cnt] = '\0'; |
7ce7e424 | 1114 | |
e2912b09 | 1115 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1116 | file = event_file_data(filp); |
1117 | if (file) | |
1118 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1119 | mutex_unlock(&event_mutex); |
1120 | ||
8b372562 TZ |
1121 | free_page((unsigned long) buf); |
1122 | if (err < 0) | |
44e9c8b7 | 1123 | return err; |
0a19e53c | 1124 | |
7ce7e424 TZ |
1125 | *ppos += cnt; |
1126 | ||
1127 | return cnt; | |
1128 | } | |
1129 | ||
e9dbfae5 SR |
1130 | static LIST_HEAD(event_subsystems); |
1131 | ||
1132 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1133 | { | |
1134 | struct event_subsystem *system = NULL; | |
ae63b31e SR |
1135 | struct ftrace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
1136 | struct trace_array *tr; | |
e9dbfae5 SR |
1137 | int ret; |
1138 | ||
d6d3523c GB |
1139 | if (tracing_is_disabled()) |
1140 | return -ENODEV; | |
1141 | ||
e9dbfae5 | 1142 | /* Make sure the system still exists */ |
a8227415 | 1143 | mutex_lock(&trace_types_lock); |
e9dbfae5 | 1144 | mutex_lock(&event_mutex); |
ae63b31e SR |
1145 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1146 | list_for_each_entry(dir, &tr->systems, list) { | |
1147 | if (dir == inode->i_private) { | |
1148 | /* Don't open systems with no events */ | |
1149 | if (dir->nr_events) { | |
1150 | __get_system_dir(dir); | |
1151 | system = dir->subsystem; | |
1152 | } | |
1153 | goto exit_loop; | |
e9dbfae5 | 1154 | } |
e9dbfae5 SR |
1155 | } |
1156 | } | |
ae63b31e | 1157 | exit_loop: |
e9dbfae5 | 1158 | mutex_unlock(&event_mutex); |
a8227415 | 1159 | mutex_unlock(&trace_types_lock); |
e9dbfae5 | 1160 | |
ae63b31e | 1161 | if (!system) |
e9dbfae5 SR |
1162 | return -ENODEV; |
1163 | ||
ae63b31e SR |
1164 | /* Some versions of gcc think dir can be uninitialized here */ |
1165 | WARN_ON(!dir); | |
1166 | ||
8e2e2fa4 SRRH |
1167 | /* Still need to increment the ref count of the system */ |
1168 | if (trace_array_get(tr) < 0) { | |
1169 | put_system(dir); | |
1170 | return -ENODEV; | |
1171 | } | |
1172 | ||
e9dbfae5 | 1173 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1174 | if (ret < 0) { |
1175 | trace_array_put(tr); | |
ae63b31e | 1176 | put_system(dir); |
8e2e2fa4 | 1177 | } |
ae63b31e SR |
1178 | |
1179 | return ret; | |
1180 | } | |
1181 | ||
1182 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1183 | { | |
1184 | struct ftrace_subsystem_dir *dir; | |
1185 | struct trace_array *tr = inode->i_private; | |
1186 | int ret; | |
1187 | ||
d6d3523c GB |
1188 | if (tracing_is_disabled()) |
1189 | return -ENODEV; | |
1190 | ||
8e2e2fa4 SRRH |
1191 | if (trace_array_get(tr) < 0) |
1192 | return -ENODEV; | |
1193 | ||
ae63b31e SR |
1194 | /* Make a temporary dir that has no system but points to tr */ |
1195 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
8e2e2fa4 SRRH |
1196 | if (!dir) { |
1197 | trace_array_put(tr); | |
ae63b31e | 1198 | return -ENOMEM; |
8e2e2fa4 | 1199 | } |
ae63b31e SR |
1200 | |
1201 | dir->tr = tr; | |
1202 | ||
1203 | ret = tracing_open_generic(inode, filp); | |
8e2e2fa4 SRRH |
1204 | if (ret < 0) { |
1205 | trace_array_put(tr); | |
ae63b31e | 1206 | kfree(dir); |
d6d3523c | 1207 | return ret; |
8e2e2fa4 | 1208 | } |
ae63b31e SR |
1209 | |
1210 | filp->private_data = dir; | |
e9dbfae5 | 1211 | |
d6d3523c | 1212 | return 0; |
e9dbfae5 SR |
1213 | } |
1214 | ||
1215 | static int subsystem_release(struct inode *inode, struct file *file) | |
1216 | { | |
ae63b31e | 1217 | struct ftrace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1218 | |
8e2e2fa4 SRRH |
1219 | trace_array_put(dir->tr); |
1220 | ||
ae63b31e SR |
1221 | /* |
1222 | * If dir->subsystem is NULL, then this is a temporary | |
1223 | * descriptor that was made for a trace_array to enable | |
1224 | * all subsystems. | |
1225 | */ | |
1226 | if (dir->subsystem) | |
1227 | put_system(dir); | |
1228 | else | |
1229 | kfree(dir); | |
e9dbfae5 SR |
1230 | |
1231 | return 0; | |
1232 | } | |
1233 | ||
cfb180f3 TZ |
1234 | static ssize_t |
1235 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1236 | loff_t *ppos) | |
1237 | { | |
ae63b31e SR |
1238 | struct ftrace_subsystem_dir *dir = filp->private_data; |
1239 | struct event_subsystem *system = dir->subsystem; | |
cfb180f3 TZ |
1240 | struct trace_seq *s; |
1241 | int r; | |
1242 | ||
1243 | if (*ppos) | |
1244 | return 0; | |
1245 | ||
1246 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1247 | if (!s) | |
1248 | return -ENOMEM; | |
1249 | ||
1250 | trace_seq_init(s); | |
1251 | ||
8b372562 | 1252 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1253 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1254 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1255 | |
1256 | kfree(s); | |
1257 | ||
1258 | return r; | |
1259 | } | |
1260 | ||
1261 | static ssize_t | |
1262 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1263 | loff_t *ppos) | |
1264 | { | |
ae63b31e | 1265 | struct ftrace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1266 | char *buf; |
cfb180f3 TZ |
1267 | int err; |
1268 | ||
8b372562 | 1269 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1270 | return -EINVAL; |
1271 | ||
8b372562 TZ |
1272 | buf = (char *)__get_free_page(GFP_TEMPORARY); |
1273 | if (!buf) | |
cfb180f3 TZ |
1274 | return -ENOMEM; |
1275 | ||
8b372562 TZ |
1276 | if (copy_from_user(buf, ubuf, cnt)) { |
1277 | free_page((unsigned long) buf); | |
1278 | return -EFAULT; | |
cfb180f3 | 1279 | } |
8b372562 | 1280 | buf[cnt] = '\0'; |
cfb180f3 | 1281 | |
ae63b31e | 1282 | err = apply_subsystem_event_filter(dir, buf); |
8b372562 TZ |
1283 | free_page((unsigned long) buf); |
1284 | if (err < 0) | |
44e9c8b7 | 1285 | return err; |
cfb180f3 TZ |
1286 | |
1287 | *ppos += cnt; | |
1288 | ||
1289 | return cnt; | |
1290 | } | |
1291 | ||
d1b182a8 SR |
1292 | static ssize_t |
1293 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1294 | { | |
1295 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1296 | struct trace_seq *s; | |
1297 | int r; | |
1298 | ||
1299 | if (*ppos) | |
1300 | return 0; | |
1301 | ||
1302 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1303 | if (!s) | |
1304 | return -ENOMEM; | |
1305 | ||
1306 | trace_seq_init(s); | |
1307 | ||
1308 | func(s); | |
5ac48378 SRRH |
1309 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1310 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1311 | |
1312 | kfree(s); | |
1313 | ||
1314 | return r; | |
1315 | } | |
1316 | ||
15075cac SR |
1317 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1318 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
f77d09a3 | 1319 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1320 | |
b77e38aa SR |
1321 | static const struct seq_operations show_event_seq_ops = { |
1322 | .start = t_start, | |
1323 | .next = t_next, | |
1324 | .show = t_show, | |
1325 | .stop = t_stop, | |
1326 | }; | |
1327 | ||
1328 | static const struct seq_operations show_set_event_seq_ops = { | |
1329 | .start = s_start, | |
1330 | .next = s_next, | |
1331 | .show = t_show, | |
1332 | .stop = t_stop, | |
1333 | }; | |
1334 | ||
2314c4ae | 1335 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1336 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1337 | .read = seq_read, |
1338 | .llseek = seq_lseek, | |
1339 | .release = seq_release, | |
1340 | }; | |
1341 | ||
b77e38aa | 1342 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1343 | .open = ftrace_event_set_open, |
b77e38aa SR |
1344 | .read = seq_read, |
1345 | .write = ftrace_event_write, | |
1346 | .llseek = seq_lseek, | |
f77d09a3 | 1347 | .release = ftrace_event_release, |
b77e38aa SR |
1348 | }; |
1349 | ||
1473e441 | 1350 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 1351 | .open = tracing_open_generic, |
1473e441 SR |
1352 | .read = event_enable_read, |
1353 | .write = event_enable_write, | |
6038f373 | 1354 | .llseek = default_llseek, |
1473e441 SR |
1355 | }; |
1356 | ||
981d081e | 1357 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1358 | .open = trace_format_open, |
1359 | .read = seq_read, | |
1360 | .llseek = seq_lseek, | |
1361 | .release = seq_release, | |
981d081e SR |
1362 | }; |
1363 | ||
23725aee | 1364 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1365 | .read = event_id_read, |
6038f373 | 1366 | .llseek = default_llseek, |
23725aee PZ |
1367 | }; |
1368 | ||
7ce7e424 TZ |
1369 | static const struct file_operations ftrace_event_filter_fops = { |
1370 | .open = tracing_open_generic, | |
1371 | .read = event_filter_read, | |
1372 | .write = event_filter_write, | |
6038f373 | 1373 | .llseek = default_llseek, |
7ce7e424 TZ |
1374 | }; |
1375 | ||
cfb180f3 | 1376 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1377 | .open = subsystem_open, |
cfb180f3 TZ |
1378 | .read = subsystem_filter_read, |
1379 | .write = subsystem_filter_write, | |
6038f373 | 1380 | .llseek = default_llseek, |
e9dbfae5 | 1381 | .release = subsystem_release, |
cfb180f3 TZ |
1382 | }; |
1383 | ||
8ae79a13 | 1384 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1385 | .open = subsystem_open, |
8ae79a13 SR |
1386 | .read = system_enable_read, |
1387 | .write = system_enable_write, | |
6038f373 | 1388 | .llseek = default_llseek, |
40ee4dff | 1389 | .release = subsystem_release, |
8ae79a13 SR |
1390 | }; |
1391 | ||
ae63b31e SR |
1392 | static const struct file_operations ftrace_tr_enable_fops = { |
1393 | .open = system_tr_open, | |
1394 | .read = system_enable_read, | |
1395 | .write = system_enable_write, | |
1396 | .llseek = default_llseek, | |
1397 | .release = subsystem_release, | |
1398 | }; | |
1399 | ||
d1b182a8 SR |
1400 | static const struct file_operations ftrace_show_header_fops = { |
1401 | .open = tracing_open_generic, | |
1402 | .read = show_header, | |
6038f373 | 1403 | .llseek = default_llseek, |
d1b182a8 SR |
1404 | }; |
1405 | ||
ae63b31e SR |
1406 | static int |
1407 | ftrace_event_open(struct inode *inode, struct file *file, | |
1408 | const struct seq_operations *seq_ops) | |
1473e441 | 1409 | { |
ae63b31e SR |
1410 | struct seq_file *m; |
1411 | int ret; | |
1473e441 | 1412 | |
ae63b31e SR |
1413 | ret = seq_open(file, seq_ops); |
1414 | if (ret < 0) | |
1415 | return ret; | |
1416 | m = file->private_data; | |
1417 | /* copy tr over to seq ops */ | |
1418 | m->private = inode->i_private; | |
1473e441 | 1419 | |
ae63b31e | 1420 | return ret; |
1473e441 SR |
1421 | } |
1422 | ||
f77d09a3 AL |
1423 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1424 | { | |
1425 | struct trace_array *tr = inode->i_private; | |
1426 | ||
1427 | trace_array_put(tr); | |
1428 | ||
1429 | return seq_release(inode, file); | |
1430 | } | |
1431 | ||
15075cac SR |
1432 | static int |
1433 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1434 | { | |
1435 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1436 | ||
ae63b31e | 1437 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1438 | } |
1439 | ||
1440 | static int | |
1441 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1442 | { | |
1443 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1444 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
1445 | int ret; |
1446 | ||
1447 | if (trace_array_get(tr) < 0) | |
1448 | return -ENODEV; | |
15075cac SR |
1449 | |
1450 | if ((file->f_mode & FMODE_WRITE) && | |
1451 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1452 | ftrace_clear_events(tr); |
15075cac | 1453 | |
f77d09a3 AL |
1454 | ret = ftrace_event_open(inode, file, seq_ops); |
1455 | if (ret < 0) | |
1456 | trace_array_put(tr); | |
1457 | return ret; | |
ae63b31e SR |
1458 | } |
1459 | ||
1460 | static struct event_subsystem * | |
1461 | create_new_subsystem(const char *name) | |
1462 | { | |
1463 | struct event_subsystem *system; | |
1464 | ||
1465 | /* need to create new entry */ | |
1466 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1467 | if (!system) | |
1468 | return NULL; | |
1469 | ||
1470 | system->ref_count = 1; | |
6e94a780 SR |
1471 | |
1472 | /* Only allocate if dynamic (kprobes and modules) */ | |
1473 | if (!core_kernel_data((unsigned long)name)) { | |
1474 | system->ref_count |= SYSTEM_FL_FREE_NAME; | |
1475 | system->name = kstrdup(name, GFP_KERNEL); | |
1476 | if (!system->name) | |
1477 | goto out_free; | |
1478 | } else | |
1479 | system->name = name; | |
ae63b31e SR |
1480 | |
1481 | system->filter = NULL; | |
1482 | ||
1483 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1484 | if (!system->filter) | |
1485 | goto out_free; | |
1486 | ||
1487 | list_add(&system->list, &event_subsystems); | |
1488 | ||
1489 | return system; | |
1490 | ||
1491 | out_free: | |
6e94a780 SR |
1492 | if (system->ref_count & SYSTEM_FL_FREE_NAME) |
1493 | kfree(system->name); | |
ae63b31e SR |
1494 | kfree(system); |
1495 | return NULL; | |
15075cac SR |
1496 | } |
1497 | ||
6ecc2d1c | 1498 | static struct dentry * |
ae63b31e SR |
1499 | event_subsystem_dir(struct trace_array *tr, const char *name, |
1500 | struct ftrace_event_file *file, struct dentry *parent) | |
6ecc2d1c | 1501 | { |
ae63b31e | 1502 | struct ftrace_subsystem_dir *dir; |
6ecc2d1c | 1503 | struct event_subsystem *system; |
e1112b4d | 1504 | struct dentry *entry; |
6ecc2d1c SR |
1505 | |
1506 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1507 | list_for_each_entry(dir, &tr->systems, list) { |
1508 | system = dir->subsystem; | |
dc82ec98 | 1509 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1510 | dir->nr_events++; |
1511 | file->system = dir; | |
1512 | return dir->entry; | |
dc82ec98 | 1513 | } |
6ecc2d1c SR |
1514 | } |
1515 | ||
ae63b31e SR |
1516 | /* Now see if the system itself exists. */ |
1517 | list_for_each_entry(system, &event_subsystems, list) { | |
1518 | if (strcmp(system->name, name) == 0) | |
1519 | break; | |
6ecc2d1c | 1520 | } |
ae63b31e SR |
1521 | /* Reset system variable when not found */ |
1522 | if (&system->list == &event_subsystems) | |
1523 | system = NULL; | |
6ecc2d1c | 1524 | |
ae63b31e SR |
1525 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1526 | if (!dir) | |
1527 | goto out_fail; | |
6ecc2d1c | 1528 | |
ae63b31e SR |
1529 | if (!system) { |
1530 | system = create_new_subsystem(name); | |
1531 | if (!system) | |
1532 | goto out_free; | |
1533 | } else | |
1534 | __get_system(system); | |
1535 | ||
1536 | dir->entry = debugfs_create_dir(name, parent); | |
1537 | if (!dir->entry) { | |
3448bac3 | 1538 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
1539 | __put_system(system); |
1540 | goto out_free; | |
6d723736 SR |
1541 | } |
1542 | ||
ae63b31e SR |
1543 | dir->tr = tr; |
1544 | dir->ref_count = 1; | |
1545 | dir->nr_events = 1; | |
1546 | dir->subsystem = system; | |
1547 | file->system = dir; | |
8b372562 | 1548 | |
ae63b31e | 1549 | entry = debugfs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1550 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1551 | if (!entry) { |
1552 | kfree(system->filter); | |
1553 | system->filter = NULL; | |
3448bac3 | 1554 | pr_warn("Could not create debugfs '%s/filter' entry\n", name); |
8b372562 | 1555 | } |
e1112b4d | 1556 | |
ae63b31e | 1557 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1558 | &ftrace_system_enable_fops); |
8ae79a13 | 1559 | |
ae63b31e SR |
1560 | list_add(&dir->list, &tr->systems); |
1561 | ||
1562 | return dir->entry; | |
1563 | ||
1564 | out_free: | |
1565 | kfree(dir); | |
1566 | out_fail: | |
1567 | /* Only print this message if failed on memory allocation */ | |
1568 | if (!dir || !system) | |
3448bac3 | 1569 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 1570 | return NULL; |
6ecc2d1c SR |
1571 | } |
1572 | ||
1473e441 | 1573 | static int |
620a30e9 | 1574 | event_create_dir(struct dentry *parent, struct ftrace_event_file *file) |
1473e441 | 1575 | { |
ae63b31e SR |
1576 | struct ftrace_event_call *call = file->event_call; |
1577 | struct trace_array *tr = file->tr; | |
2e33af02 | 1578 | struct list_head *head; |
ae63b31e | 1579 | struct dentry *d_events; |
de7b2973 | 1580 | const char *name; |
fd994989 | 1581 | int ret; |
1473e441 | 1582 | |
6ecc2d1c SR |
1583 | /* |
1584 | * If the trace point header did not define TRACE_SYSTEM | |
1585 | * then the system would be called "TRACE_SYSTEM". | |
1586 | */ | |
ae63b31e SR |
1587 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1588 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1589 | if (!d_events) | |
1590 | return -ENOMEM; | |
1591 | } else | |
1592 | d_events = parent; | |
1593 | ||
de7b2973 MD |
1594 | name = ftrace_event_name(call); |
1595 | file->dir = debugfs_create_dir(name, d_events); | |
ae63b31e | 1596 | if (!file->dir) { |
3448bac3 | 1597 | pr_warn("Could not create debugfs '%s' directory\n", name); |
1473e441 SR |
1598 | return -1; |
1599 | } | |
1600 | ||
9b63776f | 1601 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1602 | trace_create_file("enable", 0644, file->dir, file, |
620a30e9 | 1603 | &ftrace_enable_fops); |
1473e441 | 1604 | |
2239291a | 1605 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1606 | if (call->event.type && call->class->reg) |
1a11126b | 1607 | trace_create_file("id", 0444, file->dir, |
620a30e9 ON |
1608 | (void *)(long)call->event.type, |
1609 | &ftrace_event_id_fops); | |
2239291a | 1610 | #endif |
23725aee | 1611 | |
c9d932cf LZ |
1612 | /* |
1613 | * Other events may have the same class. Only update | |
1614 | * the fields if they are not already defined. | |
1615 | */ | |
1616 | head = trace_get_fields(call); | |
1617 | if (list_empty(head)) { | |
1618 | ret = call->class->define_fields(call); | |
1619 | if (ret < 0) { | |
3448bac3 FF |
1620 | pr_warn("Could not initialize trace point events/%s\n", |
1621 | name); | |
ae63b31e | 1622 | return -1; |
cf027f64 TZ |
1623 | } |
1624 | } | |
f306cc82 | 1625 | trace_create_file("filter", 0644, file->dir, file, |
620a30e9 | 1626 | &ftrace_event_filter_fops); |
cf027f64 | 1627 | |
85f2b082 TZ |
1628 | trace_create_file("trigger", 0644, file->dir, file, |
1629 | &event_trigger_fops); | |
1630 | ||
ae63b31e | 1631 | trace_create_file("format", 0444, file->dir, call, |
620a30e9 | 1632 | &ftrace_event_format_fops); |
6d723736 SR |
1633 | |
1634 | return 0; | |
1635 | } | |
1636 | ||
ae63b31e SR |
1637 | static void remove_event_from_tracers(struct ftrace_event_call *call) |
1638 | { | |
1639 | struct ftrace_event_file *file; | |
1640 | struct trace_array *tr; | |
1641 | ||
1642 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
1643 | if (file->event_call != call) |
1644 | continue; | |
1645 | ||
f6a84bdc | 1646 | remove_event_file_dir(file); |
ae63b31e SR |
1647 | /* |
1648 | * The do_for_each_event_file_safe() is | |
1649 | * a double loop. After finding the call for this | |
1650 | * trace_array, we use break to jump to the next | |
1651 | * trace_array. | |
1652 | */ | |
1653 | break; | |
1654 | } while_for_each_event_file(); | |
1655 | } | |
1656 | ||
8781915a EG |
1657 | static void event_remove(struct ftrace_event_call *call) |
1658 | { | |
ae63b31e SR |
1659 | struct trace_array *tr; |
1660 | struct ftrace_event_file *file; | |
1661 | ||
1662 | do_for_each_event_file(tr, file) { | |
1663 | if (file->event_call != call) | |
1664 | continue; | |
1665 | ftrace_event_enable_disable(file, 0); | |
1666 | /* | |
1667 | * The do_for_each_event_file() is | |
1668 | * a double loop. After finding the call for this | |
1669 | * trace_array, we use break to jump to the next | |
1670 | * trace_array. | |
1671 | */ | |
1672 | break; | |
1673 | } while_for_each_event_file(); | |
1674 | ||
8781915a EG |
1675 | if (call->event.funcs) |
1676 | __unregister_ftrace_event(&call->event); | |
ae63b31e | 1677 | remove_event_from_tracers(call); |
8781915a EG |
1678 | list_del(&call->list); |
1679 | } | |
1680 | ||
1681 | static int event_init(struct ftrace_event_call *call) | |
1682 | { | |
1683 | int ret = 0; | |
de7b2973 | 1684 | const char *name; |
8781915a | 1685 | |
de7b2973 MD |
1686 | name = ftrace_event_name(call); |
1687 | if (WARN_ON(!name)) | |
8781915a EG |
1688 | return -EINVAL; |
1689 | ||
1690 | if (call->class->raw_init) { | |
1691 | ret = call->class->raw_init(call); | |
1692 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 1693 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
1694 | } |
1695 | ||
1696 | return ret; | |
1697 | } | |
1698 | ||
67ead0a6 | 1699 | static int |
ae63b31e | 1700 | __register_event(struct ftrace_event_call *call, struct module *mod) |
bd1a5c84 | 1701 | { |
bd1a5c84 | 1702 | int ret; |
6d723736 | 1703 | |
8781915a EG |
1704 | ret = event_init(call); |
1705 | if (ret < 0) | |
1706 | return ret; | |
701970b3 | 1707 | |
ae63b31e | 1708 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 1709 | call->mod = mod; |
88f70d75 | 1710 | |
ae63b31e | 1711 | return 0; |
bd1a5c84 MH |
1712 | } |
1713 | ||
0c564a53 SRRH |
1714 | static char *enum_replace(char *ptr, struct trace_enum_map *map, int len) |
1715 | { | |
1716 | int rlen; | |
1717 | int elen; | |
1718 | ||
1719 | /* Find the length of the enum value as a string */ | |
1720 | elen = snprintf(ptr, 0, "%ld", map->enum_value); | |
1721 | /* Make sure there's enough room to replace the string with the value */ | |
1722 | if (len < elen) | |
1723 | return NULL; | |
1724 | ||
1725 | snprintf(ptr, elen + 1, "%ld", map->enum_value); | |
1726 | ||
1727 | /* Get the rest of the string of ptr */ | |
1728 | rlen = strlen(ptr + len); | |
1729 | memmove(ptr + elen, ptr + len, rlen); | |
1730 | /* Make sure we end the new string */ | |
1731 | ptr[elen + rlen] = 0; | |
1732 | ||
1733 | return ptr + elen; | |
1734 | } | |
1735 | ||
1736 | static void update_event_printk(struct ftrace_event_call *call, | |
1737 | struct trace_enum_map *map) | |
1738 | { | |
1739 | char *ptr; | |
1740 | int quote = 0; | |
1741 | int len = strlen(map->enum_string); | |
1742 | ||
1743 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
1744 | if (*ptr == '\\') { | |
1745 | ptr++; | |
1746 | /* paranoid */ | |
1747 | if (!*ptr) | |
1748 | break; | |
1749 | continue; | |
1750 | } | |
1751 | if (*ptr == '"') { | |
1752 | quote ^= 1; | |
1753 | continue; | |
1754 | } | |
1755 | if (quote) | |
1756 | continue; | |
1757 | if (isdigit(*ptr)) { | |
1758 | /* skip numbers */ | |
1759 | do { | |
1760 | ptr++; | |
1761 | /* Check for alpha chars like ULL */ | |
1762 | } while (isalnum(*ptr)); | |
1763 | /* | |
1764 | * A number must have some kind of delimiter after | |
1765 | * it, and we can ignore that too. | |
1766 | */ | |
1767 | continue; | |
1768 | } | |
1769 | if (isalpha(*ptr) || *ptr == '_') { | |
1770 | if (strncmp(map->enum_string, ptr, len) == 0 && | |
1771 | !isalnum(ptr[len]) && ptr[len] != '_') { | |
1772 | ptr = enum_replace(ptr, map, len); | |
1773 | /* Hmm, enum string smaller than value */ | |
1774 | if (WARN_ON_ONCE(!ptr)) | |
1775 | return; | |
1776 | /* | |
1777 | * No need to decrement here, as enum_replace() | |
1778 | * returns the pointer to the character passed | |
1779 | * the enum, and two enums can not be placed | |
1780 | * back to back without something in between. | |
1781 | * We can skip that something in between. | |
1782 | */ | |
1783 | continue; | |
1784 | } | |
1785 | skip_more: | |
1786 | do { | |
1787 | ptr++; | |
1788 | } while (isalnum(*ptr) || *ptr == '_'); | |
1789 | /* | |
1790 | * If what comes after this variable is a '.' or | |
1791 | * '->' then we can continue to ignore that string. | |
1792 | */ | |
1793 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
1794 | ptr += *ptr == '.' ? 1 : 2; | |
1795 | goto skip_more; | |
1796 | } | |
1797 | /* | |
1798 | * Once again, we can skip the delimiter that came | |
1799 | * after the string. | |
1800 | */ | |
1801 | continue; | |
1802 | } | |
1803 | } | |
1804 | } | |
1805 | ||
1806 | void trace_event_enum_update(struct trace_enum_map **map, int len) | |
1807 | { | |
1808 | struct ftrace_event_call *call, *p; | |
1809 | const char *last_system = NULL; | |
1810 | int last_i; | |
1811 | int i; | |
1812 | ||
1813 | down_write(&trace_event_sem); | |
1814 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
1815 | /* events are usually grouped together with systems */ | |
1816 | if (!last_system || call->class->system != last_system) { | |
1817 | last_i = 0; | |
1818 | last_system = call->class->system; | |
1819 | } | |
1820 | ||
1821 | for (i = last_i; i < len; i++) { | |
1822 | if (call->class->system == map[i]->system) { | |
1823 | /* Save the first system if need be */ | |
1824 | if (!last_i) | |
1825 | last_i = i; | |
1826 | update_event_printk(call, map[i]); | |
1827 | } | |
1828 | } | |
1829 | } | |
1830 | up_write(&trace_event_sem); | |
1831 | } | |
1832 | ||
da511bf3 SRRH |
1833 | static struct ftrace_event_file * |
1834 | trace_create_new_event(struct ftrace_event_call *call, | |
1835 | struct trace_array *tr) | |
1836 | { | |
1837 | struct ftrace_event_file *file; | |
1838 | ||
1839 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
1840 | if (!file) | |
1841 | return NULL; | |
1842 | ||
1843 | file->event_call = call; | |
1844 | file->tr = tr; | |
1845 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
1846 | atomic_set(&file->tm_ref, 0); |
1847 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
1848 | list_add(&file->list, &tr->events); |
1849 | ||
1850 | return file; | |
1851 | } | |
1852 | ||
ae63b31e SR |
1853 | /* Add an event to a trace directory */ |
1854 | static int | |
620a30e9 | 1855 | __trace_add_new_event(struct ftrace_event_call *call, struct trace_array *tr) |
ae63b31e SR |
1856 | { |
1857 | struct ftrace_event_file *file; | |
1858 | ||
da511bf3 | 1859 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
1860 | if (!file) |
1861 | return -ENOMEM; | |
1862 | ||
620a30e9 | 1863 | return event_create_dir(tr->event_dir, file); |
ae63b31e SR |
1864 | } |
1865 | ||
77248221 SR |
1866 | /* |
1867 | * Just create a decriptor for early init. A descriptor is required | |
1868 | * for enabling events at boot. We want to enable events before | |
1869 | * the filesystem is initialized. | |
1870 | */ | |
1871 | static __init int | |
1872 | __trace_early_add_new_event(struct ftrace_event_call *call, | |
1873 | struct trace_array *tr) | |
1874 | { | |
1875 | struct ftrace_event_file *file; | |
1876 | ||
da511bf3 | 1877 | file = trace_create_new_event(call, tr); |
77248221 SR |
1878 | if (!file) |
1879 | return -ENOMEM; | |
1880 | ||
77248221 SR |
1881 | return 0; |
1882 | } | |
1883 | ||
ae63b31e | 1884 | struct ftrace_module_file_ops; |
779c5e37 | 1885 | static void __add_event_to_tracers(struct ftrace_event_call *call); |
ae63b31e | 1886 | |
bd1a5c84 MH |
1887 | /* Add an additional event_call dynamically */ |
1888 | int trace_add_event_call(struct ftrace_event_call *call) | |
1889 | { | |
1890 | int ret; | |
a8227415 | 1891 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 1892 | mutex_lock(&event_mutex); |
701970b3 | 1893 | |
ae63b31e SR |
1894 | ret = __register_event(call, NULL); |
1895 | if (ret >= 0) | |
779c5e37 | 1896 | __add_event_to_tracers(call); |
a2ca5e03 | 1897 | |
ae63b31e | 1898 | mutex_unlock(&event_mutex); |
a8227415 | 1899 | mutex_unlock(&trace_types_lock); |
ae63b31e | 1900 | return ret; |
a2ca5e03 FW |
1901 | } |
1902 | ||
4fead8e4 | 1903 | /* |
a8227415 AL |
1904 | * Must be called under locking of trace_types_lock, event_mutex and |
1905 | * trace_event_sem. | |
4fead8e4 | 1906 | */ |
bd1a5c84 MH |
1907 | static void __trace_remove_event_call(struct ftrace_event_call *call) |
1908 | { | |
8781915a | 1909 | event_remove(call); |
bd1a5c84 | 1910 | trace_destroy_fields(call); |
57375747 ON |
1911 | free_event_filter(call->filter); |
1912 | call->filter = NULL; | |
bd1a5c84 MH |
1913 | } |
1914 | ||
2816c551 ON |
1915 | static int probe_remove_event_call(struct ftrace_event_call *call) |
1916 | { | |
1917 | struct trace_array *tr; | |
1918 | struct ftrace_event_file *file; | |
1919 | ||
1920 | #ifdef CONFIG_PERF_EVENTS | |
1921 | if (call->perf_refcount) | |
1922 | return -EBUSY; | |
1923 | #endif | |
1924 | do_for_each_event_file(tr, file) { | |
1925 | if (file->event_call != call) | |
1926 | continue; | |
1927 | /* | |
1928 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
1929 | * we are going to do, FTRACE_EVENT_FL_SOFT_MODE can suppress | |
1930 | * TRACE_REG_UNREGISTER. | |
1931 | */ | |
1932 | if (file->flags & FTRACE_EVENT_FL_ENABLED) | |
1933 | return -EBUSY; | |
2ba64035 SRRH |
1934 | /* |
1935 | * The do_for_each_event_file_safe() is | |
1936 | * a double loop. After finding the call for this | |
1937 | * trace_array, we use break to jump to the next | |
1938 | * trace_array. | |
1939 | */ | |
2816c551 ON |
1940 | break; |
1941 | } while_for_each_event_file(); | |
1942 | ||
1943 | __trace_remove_event_call(call); | |
1944 | ||
1945 | return 0; | |
1946 | } | |
1947 | ||
bd1a5c84 | 1948 | /* Remove an event_call */ |
2816c551 | 1949 | int trace_remove_event_call(struct ftrace_event_call *call) |
bd1a5c84 | 1950 | { |
2816c551 ON |
1951 | int ret; |
1952 | ||
a8227415 | 1953 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 1954 | mutex_lock(&event_mutex); |
52f6ad6d | 1955 | down_write(&trace_event_sem); |
2816c551 | 1956 | ret = probe_remove_event_call(call); |
52f6ad6d | 1957 | up_write(&trace_event_sem); |
bd1a5c84 | 1958 | mutex_unlock(&event_mutex); |
a8227415 | 1959 | mutex_unlock(&trace_types_lock); |
2816c551 ON |
1960 | |
1961 | return ret; | |
bd1a5c84 MH |
1962 | } |
1963 | ||
1964 | #define for_each_event(event, start, end) \ | |
1965 | for (event = start; \ | |
1966 | (unsigned long)event < (unsigned long)end; \ | |
1967 | event++) | |
1968 | ||
1969 | #ifdef CONFIG_MODULES | |
1970 | ||
6d723736 SR |
1971 | static void trace_module_add_events(struct module *mod) |
1972 | { | |
e4a9ea5e | 1973 | struct ftrace_event_call **call, **start, **end; |
6d723736 | 1974 | |
45ab2813 SRRH |
1975 | if (!mod->num_trace_events) |
1976 | return; | |
1977 | ||
1978 | /* Don't add infrastructure for mods without tracepoints */ | |
1979 | if (trace_module_has_bad_taint(mod)) { | |
1980 | pr_err("%s: module has bad taint, not creating trace events\n", | |
1981 | mod->name); | |
1982 | return; | |
1983 | } | |
1984 | ||
6d723736 SR |
1985 | start = mod->trace_events; |
1986 | end = mod->trace_events + mod->num_trace_events; | |
1987 | ||
6d723736 | 1988 | for_each_event(call, start, end) { |
ae63b31e | 1989 | __register_event(*call, mod); |
779c5e37 | 1990 | __add_event_to_tracers(*call); |
6d723736 SR |
1991 | } |
1992 | } | |
1993 | ||
1994 | static void trace_module_remove_events(struct module *mod) | |
1995 | { | |
1996 | struct ftrace_event_call *call, *p; | |
575380da | 1997 | bool clear_trace = false; |
6d723736 | 1998 | |
52f6ad6d | 1999 | down_write(&trace_event_sem); |
6d723736 SR |
2000 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
2001 | if (call->mod == mod) { | |
575380da SRRH |
2002 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
2003 | clear_trace = true; | |
bd1a5c84 | 2004 | __trace_remove_event_call(call); |
6d723736 SR |
2005 | } |
2006 | } | |
52f6ad6d | 2007 | up_write(&trace_event_sem); |
9456f0fa SR |
2008 | |
2009 | /* | |
2010 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
2011 | * registered any events that were used. The only worry is if |
2012 | * a new module gets loaded, and takes on the same id as the events | |
2013 | * of this module. When printing out the buffer, traced events left | |
2014 | * over from this module may be passed to the new module events and | |
2015 | * unexpected results may occur. | |
9456f0fa | 2016 | */ |
575380da | 2017 | if (clear_trace) |
873c642f | 2018 | tracing_reset_all_online_cpus(); |
6d723736 SR |
2019 | } |
2020 | ||
61f919a1 SR |
2021 | static int trace_module_notify(struct notifier_block *self, |
2022 | unsigned long val, void *data) | |
6d723736 SR |
2023 | { |
2024 | struct module *mod = data; | |
2025 | ||
a8227415 | 2026 | mutex_lock(&trace_types_lock); |
6d723736 SR |
2027 | mutex_lock(&event_mutex); |
2028 | switch (val) { | |
2029 | case MODULE_STATE_COMING: | |
2030 | trace_module_add_events(mod); | |
2031 | break; | |
2032 | case MODULE_STATE_GOING: | |
2033 | trace_module_remove_events(mod); | |
2034 | break; | |
2035 | } | |
2036 | mutex_unlock(&event_mutex); | |
a8227415 | 2037 | mutex_unlock(&trace_types_lock); |
fd994989 | 2038 | |
1473e441 SR |
2039 | return 0; |
2040 | } | |
315326c1 | 2041 | |
836d481e ON |
2042 | static struct notifier_block trace_module_nb = { |
2043 | .notifier_call = trace_module_notify, | |
3673b8e4 | 2044 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 2045 | }; |
61f919a1 | 2046 | #endif /* CONFIG_MODULES */ |
1473e441 | 2047 | |
ae63b31e SR |
2048 | /* Create a new event directory structure for a trace directory. */ |
2049 | static void | |
2050 | __trace_add_event_dirs(struct trace_array *tr) | |
2051 | { | |
ae63b31e SR |
2052 | struct ftrace_event_call *call; |
2053 | int ret; | |
2054 | ||
2055 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 2056 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 2057 | if (ret < 0) |
3448bac3 FF |
2058 | pr_warn("Could not create directory for event %s\n", |
2059 | ftrace_event_name(call)); | |
ae63b31e SR |
2060 | } |
2061 | } | |
2062 | ||
7862ad18 | 2063 | struct ftrace_event_file * |
3cd715de SRRH |
2064 | find_event_file(struct trace_array *tr, const char *system, const char *event) |
2065 | { | |
2066 | struct ftrace_event_file *file; | |
2067 | struct ftrace_event_call *call; | |
de7b2973 | 2068 | const char *name; |
3cd715de SRRH |
2069 | |
2070 | list_for_each_entry(file, &tr->events, list) { | |
2071 | ||
2072 | call = file->event_call; | |
de7b2973 | 2073 | name = ftrace_event_name(call); |
3cd715de | 2074 | |
de7b2973 | 2075 | if (!name || !call->class || !call->class->reg) |
3cd715de SRRH |
2076 | continue; |
2077 | ||
2078 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2079 | continue; | |
2080 | ||
de7b2973 | 2081 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
2082 | strcmp(system, call->class->system) == 0) |
2083 | return file; | |
2084 | } | |
2085 | return NULL; | |
2086 | } | |
2087 | ||
2875a08b SRRH |
2088 | #ifdef CONFIG_DYNAMIC_FTRACE |
2089 | ||
2090 | /* Avoid typos */ | |
2091 | #define ENABLE_EVENT_STR "enable_event" | |
2092 | #define DISABLE_EVENT_STR "disable_event" | |
2093 | ||
2094 | struct event_probe_data { | |
2095 | struct ftrace_event_file *file; | |
2096 | unsigned long count; | |
2097 | int ref; | |
2098 | bool enable; | |
2099 | }; | |
2100 | ||
3cd715de SRRH |
2101 | static void |
2102 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2103 | { | |
2104 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2105 | struct event_probe_data *data = *pdata; | |
2106 | ||
2107 | if (!data) | |
2108 | return; | |
2109 | ||
2110 | if (data->enable) | |
2111 | clear_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2112 | else | |
2113 | set_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2114 | } | |
2115 | ||
2116 | static void | |
2117 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2118 | { | |
2119 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2120 | struct event_probe_data *data = *pdata; | |
2121 | ||
2122 | if (!data) | |
2123 | return; | |
2124 | ||
2125 | if (!data->count) | |
2126 | return; | |
2127 | ||
2128 | /* Skip if the event is in a state we want to switch to */ | |
2129 | if (data->enable == !(data->file->flags & FTRACE_EVENT_FL_SOFT_DISABLED)) | |
2130 | return; | |
2131 | ||
2132 | if (data->count != -1) | |
2133 | (data->count)--; | |
2134 | ||
2135 | event_enable_probe(ip, parent_ip, _data); | |
2136 | } | |
2137 | ||
2138 | static int | |
2139 | event_enable_print(struct seq_file *m, unsigned long ip, | |
2140 | struct ftrace_probe_ops *ops, void *_data) | |
2141 | { | |
2142 | struct event_probe_data *data = _data; | |
2143 | ||
2144 | seq_printf(m, "%ps:", (void *)ip); | |
2145 | ||
2146 | seq_printf(m, "%s:%s:%s", | |
2147 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, | |
2148 | data->file->event_call->class->system, | |
de7b2973 | 2149 | ftrace_event_name(data->file->event_call)); |
3cd715de SRRH |
2150 | |
2151 | if (data->count == -1) | |
fa6f0cc7 | 2152 | seq_puts(m, ":unlimited\n"); |
3cd715de SRRH |
2153 | else |
2154 | seq_printf(m, ":count=%ld\n", data->count); | |
2155 | ||
2156 | return 0; | |
2157 | } | |
2158 | ||
2159 | static int | |
2160 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, | |
2161 | void **_data) | |
2162 | { | |
2163 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2164 | struct event_probe_data *data = *pdata; | |
2165 | ||
2166 | data->ref++; | |
2167 | return 0; | |
2168 | } | |
2169 | ||
2170 | static void | |
2171 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, | |
2172 | void **_data) | |
2173 | { | |
2174 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2175 | struct event_probe_data *data = *pdata; | |
2176 | ||
2177 | if (WARN_ON_ONCE(data->ref <= 0)) | |
2178 | return; | |
2179 | ||
2180 | data->ref--; | |
2181 | if (!data->ref) { | |
2182 | /* Remove the SOFT_MODE flag */ | |
2183 | __ftrace_event_enable_disable(data->file, 0, 1); | |
2184 | module_put(data->file->event_call->mod); | |
2185 | kfree(data); | |
2186 | } | |
2187 | *pdata = NULL; | |
2188 | } | |
2189 | ||
2190 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2191 | .func = event_enable_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_enable_count_probe_ops = { | |
2198 | .func = event_enable_count_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_probe_ops = { | |
2205 | .func = event_enable_probe, | |
2206 | .print = event_enable_print, | |
2207 | .init = event_enable_init, | |
2208 | .free = event_enable_free, | |
2209 | }; | |
2210 | ||
2211 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2212 | .func = event_enable_count_probe, | |
2213 | .print = event_enable_print, | |
2214 | .init = event_enable_init, | |
2215 | .free = event_enable_free, | |
2216 | }; | |
2217 | ||
2218 | static int | |
2219 | event_enable_func(struct ftrace_hash *hash, | |
2220 | char *glob, char *cmd, char *param, int enabled) | |
2221 | { | |
2222 | struct trace_array *tr = top_trace_array(); | |
2223 | struct ftrace_event_file *file; | |
2224 | struct ftrace_probe_ops *ops; | |
2225 | struct event_probe_data *data; | |
2226 | const char *system; | |
2227 | const char *event; | |
2228 | char *number; | |
2229 | bool enable; | |
2230 | int ret; | |
2231 | ||
dc81e5e3 YY |
2232 | if (!tr) |
2233 | return -ENODEV; | |
2234 | ||
3cd715de | 2235 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 2236 | if (!enabled || !param) |
3cd715de SRRH |
2237 | return -EINVAL; |
2238 | ||
2239 | system = strsep(¶m, ":"); | |
2240 | if (!param) | |
2241 | return -EINVAL; | |
2242 | ||
2243 | event = strsep(¶m, ":"); | |
2244 | ||
2245 | mutex_lock(&event_mutex); | |
2246 | ||
2247 | ret = -EINVAL; | |
2248 | file = find_event_file(tr, system, event); | |
2249 | if (!file) | |
2250 | goto out; | |
2251 | ||
2252 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2253 | ||
2254 | if (enable) | |
2255 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2256 | else | |
2257 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2258 | ||
2259 | if (glob[0] == '!') { | |
2260 | unregister_ftrace_function_probe_func(glob+1, ops); | |
2261 | ret = 0; | |
2262 | goto out; | |
2263 | } | |
2264 | ||
2265 | ret = -ENOMEM; | |
2266 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2267 | if (!data) | |
2268 | goto out; | |
2269 | ||
2270 | data->enable = enable; | |
2271 | data->count = -1; | |
2272 | data->file = file; | |
2273 | ||
2274 | if (!param) | |
2275 | goto out_reg; | |
2276 | ||
2277 | number = strsep(¶m, ":"); | |
2278 | ||
2279 | ret = -EINVAL; | |
2280 | if (!strlen(number)) | |
2281 | goto out_free; | |
2282 | ||
2283 | /* | |
2284 | * We use the callback data field (which is a pointer) | |
2285 | * as our counter. | |
2286 | */ | |
2287 | ret = kstrtoul(number, 0, &data->count); | |
2288 | if (ret) | |
2289 | goto out_free; | |
2290 | ||
2291 | out_reg: | |
2292 | /* Don't let event modules unload while probe registered */ | |
2293 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2294 | if (!ret) { |
2295 | ret = -EBUSY; | |
3cd715de | 2296 | goto out_free; |
6ed01066 | 2297 | } |
3cd715de SRRH |
2298 | |
2299 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2300 | if (ret < 0) | |
2301 | goto out_put; | |
2302 | ret = register_ftrace_function_probe(glob, ops, data); | |
ff305ded SRRH |
2303 | /* |
2304 | * The above returns on success the # of functions enabled, | |
2305 | * but if it didn't find any functions it returns zero. | |
2306 | * Consider no functions a failure too. | |
2307 | */ | |
a5b85bd1 MH |
2308 | if (!ret) { |
2309 | ret = -ENOENT; | |
3cd715de | 2310 | goto out_disable; |
ff305ded SRRH |
2311 | } else if (ret < 0) |
2312 | goto out_disable; | |
2313 | /* Just return zero, not the number of enabled functions */ | |
2314 | ret = 0; | |
3cd715de SRRH |
2315 | out: |
2316 | mutex_unlock(&event_mutex); | |
2317 | return ret; | |
2318 | ||
2319 | out_disable: | |
2320 | __ftrace_event_enable_disable(file, 0, 1); | |
2321 | out_put: | |
2322 | module_put(file->event_call->mod); | |
2323 | out_free: | |
2324 | kfree(data); | |
2325 | goto out; | |
2326 | } | |
2327 | ||
2328 | static struct ftrace_func_command event_enable_cmd = { | |
2329 | .name = ENABLE_EVENT_STR, | |
2330 | .func = event_enable_func, | |
2331 | }; | |
2332 | ||
2333 | static struct ftrace_func_command event_disable_cmd = { | |
2334 | .name = DISABLE_EVENT_STR, | |
2335 | .func = event_enable_func, | |
2336 | }; | |
2337 | ||
2338 | static __init int register_event_cmds(void) | |
2339 | { | |
2340 | int ret; | |
2341 | ||
2342 | ret = register_ftrace_command(&event_enable_cmd); | |
2343 | if (WARN_ON(ret < 0)) | |
2344 | return ret; | |
2345 | ret = register_ftrace_command(&event_disable_cmd); | |
2346 | if (WARN_ON(ret < 0)) | |
2347 | unregister_ftrace_command(&event_enable_cmd); | |
2348 | return ret; | |
2349 | } | |
2350 | #else | |
2351 | static inline int register_event_cmds(void) { return 0; } | |
2352 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2353 | ||
77248221 SR |
2354 | /* |
2355 | * The top level array has already had its ftrace_event_file | |
2356 | * descriptors created in order to allow for early events to | |
2357 | * be recorded. This function is called after the debugfs has been | |
2358 | * initialized, and we now have to create the files associated | |
2359 | * to the events. | |
2360 | */ | |
2361 | static __init void | |
2362 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2363 | { | |
2364 | struct ftrace_event_file *file; | |
2365 | int ret; | |
2366 | ||
2367 | ||
2368 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 2369 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 2370 | if (ret < 0) |
3448bac3 FF |
2371 | pr_warn("Could not create directory for event %s\n", |
2372 | ftrace_event_name(file->event_call)); | |
77248221 SR |
2373 | } |
2374 | } | |
2375 | ||
2376 | /* | |
2377 | * For early boot up, the top trace array requires to have | |
2378 | * a list of events that can be enabled. This must be done before | |
2379 | * the filesystem is set up in order to allow events to be traced | |
2380 | * early. | |
2381 | */ | |
2382 | static __init void | |
2383 | __trace_early_add_events(struct trace_array *tr) | |
2384 | { | |
2385 | struct ftrace_event_call *call; | |
2386 | int ret; | |
2387 | ||
2388 | list_for_each_entry(call, &ftrace_events, list) { | |
2389 | /* Early boot up should not have any modules loaded */ | |
2390 | if (WARN_ON_ONCE(call->mod)) | |
2391 | continue; | |
2392 | ||
2393 | ret = __trace_early_add_new_event(call, tr); | |
2394 | if (ret < 0) | |
3448bac3 FF |
2395 | pr_warn("Could not create early event %s\n", |
2396 | ftrace_event_name(call)); | |
77248221 SR |
2397 | } |
2398 | } | |
2399 | ||
0c8916c3 SR |
2400 | /* Remove the event directory structure for a trace directory. */ |
2401 | static void | |
2402 | __trace_remove_event_dirs(struct trace_array *tr) | |
2403 | { | |
2404 | struct ftrace_event_file *file, *next; | |
2405 | ||
f6a84bdc ON |
2406 | list_for_each_entry_safe(file, next, &tr->events, list) |
2407 | remove_event_file_dir(file); | |
0c8916c3 SR |
2408 | } |
2409 | ||
779c5e37 | 2410 | static void __add_event_to_tracers(struct ftrace_event_call *call) |
ae63b31e SR |
2411 | { |
2412 | struct trace_array *tr; | |
2413 | ||
620a30e9 ON |
2414 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
2415 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
2416 | } |
2417 | ||
e4a9ea5e SR |
2418 | extern struct ftrace_event_call *__start_ftrace_events[]; |
2419 | extern struct ftrace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2420 | |
020e5f85 LZ |
2421 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2422 | ||
2423 | static __init int setup_trace_event(char *str) | |
2424 | { | |
2425 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2426 | ring_buffer_expanded = true; |
2427 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2428 | |
2429 | return 1; | |
2430 | } | |
2431 | __setup("trace_event=", setup_trace_event); | |
2432 | ||
77248221 SR |
2433 | /* Expects to have event_mutex held when called */ |
2434 | static int | |
2435 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2436 | { |
2437 | struct dentry *d_events; | |
2438 | struct dentry *entry; | |
2439 | ||
2440 | entry = debugfs_create_file("set_event", 0644, parent, | |
2441 | tr, &ftrace_set_event_fops); | |
2442 | if (!entry) { | |
3448bac3 | 2443 | pr_warn("Could not create debugfs 'set_event' entry\n"); |
ae63b31e SR |
2444 | return -ENOMEM; |
2445 | } | |
2446 | ||
2447 | d_events = debugfs_create_dir("events", parent); | |
277ba044 | 2448 | if (!d_events) { |
3448bac3 | 2449 | pr_warn("Could not create debugfs 'events' directory\n"); |
277ba044 SR |
2450 | return -ENOMEM; |
2451 | } | |
ae63b31e SR |
2452 | |
2453 | /* ring buffer internal formats */ | |
2454 | trace_create_file("header_page", 0444, d_events, | |
2455 | ring_buffer_print_page_header, | |
2456 | &ftrace_show_header_fops); | |
2457 | ||
2458 | trace_create_file("header_event", 0444, d_events, | |
2459 | ring_buffer_print_entry_header, | |
2460 | &ftrace_show_header_fops); | |
2461 | ||
2462 | trace_create_file("enable", 0644, d_events, | |
2463 | tr, &ftrace_tr_enable_fops); | |
2464 | ||
2465 | tr->event_dir = d_events; | |
77248221 SR |
2466 | |
2467 | return 0; | |
2468 | } | |
2469 | ||
2470 | /** | |
2471 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2472 | * @parent: The parent dentry to place the files/directories for events in | |
2473 | * @tr: The trace array associated with these events | |
2474 | * | |
2475 | * When a new instance is created, it needs to set up its events | |
2476 | * directory, as well as other files associated with events. It also | |
2477 | * creates the event hierachry in the @parent/events directory. | |
2478 | * | |
2479 | * Returns 0 on success. | |
2480 | */ | |
2481 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2482 | { | |
2483 | int ret; | |
2484 | ||
2485 | mutex_lock(&event_mutex); | |
2486 | ||
2487 | ret = create_event_toplevel_files(parent, tr); | |
2488 | if (ret) | |
2489 | goto out_unlock; | |
2490 | ||
52f6ad6d | 2491 | down_write(&trace_event_sem); |
ae63b31e | 2492 | __trace_add_event_dirs(tr); |
52f6ad6d | 2493 | up_write(&trace_event_sem); |
277ba044 | 2494 | |
77248221 | 2495 | out_unlock: |
277ba044 | 2496 | mutex_unlock(&event_mutex); |
ae63b31e | 2497 | |
77248221 SR |
2498 | return ret; |
2499 | } | |
2500 | ||
2501 | /* | |
2502 | * The top trace array already had its file descriptors created. | |
2503 | * Now the files themselves need to be created. | |
2504 | */ | |
2505 | static __init int | |
2506 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2507 | { | |
2508 | int ret; | |
2509 | ||
2510 | mutex_lock(&event_mutex); | |
2511 | ||
2512 | ret = create_event_toplevel_files(parent, tr); | |
2513 | if (ret) | |
2514 | goto out_unlock; | |
2515 | ||
52f6ad6d | 2516 | down_write(&trace_event_sem); |
77248221 | 2517 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 2518 | up_write(&trace_event_sem); |
77248221 SR |
2519 | |
2520 | out_unlock: | |
2521 | mutex_unlock(&event_mutex); | |
2522 | ||
2523 | return ret; | |
ae63b31e SR |
2524 | } |
2525 | ||
0c8916c3 SR |
2526 | int event_trace_del_tracer(struct trace_array *tr) |
2527 | { | |
0c8916c3 SR |
2528 | mutex_lock(&event_mutex); |
2529 | ||
85f2b082 TZ |
2530 | /* Disable any event triggers and associated soft-disabled events */ |
2531 | clear_event_triggers(tr); | |
2532 | ||
2a6c24af SRRH |
2533 | /* Disable any running events */ |
2534 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
2535 | ||
3ccb0123 SR |
2536 | /* Access to events are within rcu_read_lock_sched() */ |
2537 | synchronize_sched(); | |
2538 | ||
52f6ad6d | 2539 | down_write(&trace_event_sem); |
0c8916c3 SR |
2540 | __trace_remove_event_dirs(tr); |
2541 | debugfs_remove_recursive(tr->event_dir); | |
52f6ad6d | 2542 | up_write(&trace_event_sem); |
0c8916c3 SR |
2543 | |
2544 | tr->event_dir = NULL; | |
2545 | ||
2546 | mutex_unlock(&event_mutex); | |
2547 | ||
2548 | return 0; | |
2549 | } | |
2550 | ||
d1a29143 SR |
2551 | static __init int event_trace_memsetup(void) |
2552 | { | |
2553 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
2554 | file_cachep = KMEM_CACHE(ftrace_event_file, SLAB_PANIC); | |
2555 | return 0; | |
2556 | } | |
2557 | ||
ce1039bd SRRH |
2558 | static __init void |
2559 | early_enable_events(struct trace_array *tr, bool disable_first) | |
2560 | { | |
2561 | char *buf = bootup_event_buf; | |
2562 | char *token; | |
2563 | int ret; | |
2564 | ||
2565 | while (true) { | |
2566 | token = strsep(&buf, ","); | |
2567 | ||
2568 | if (!token) | |
2569 | break; | |
2570 | if (!*token) | |
2571 | continue; | |
2572 | ||
2573 | /* Restarting syscalls requires that we stop them first */ | |
2574 | if (disable_first) | |
2575 | ftrace_set_clr_event(tr, token, 0); | |
2576 | ||
2577 | ret = ftrace_set_clr_event(tr, token, 1); | |
2578 | if (ret) | |
2579 | pr_warn("Failed to enable trace event: %s\n", token); | |
2580 | ||
2581 | /* Put back the comma to allow this to be called again */ | |
2582 | if (buf) | |
2583 | *(buf - 1) = ','; | |
2584 | } | |
2585 | } | |
2586 | ||
8781915a EG |
2587 | static __init int event_trace_enable(void) |
2588 | { | |
ae63b31e | 2589 | struct trace_array *tr = top_trace_array(); |
8781915a | 2590 | struct ftrace_event_call **iter, *call; |
8781915a EG |
2591 | int ret; |
2592 | ||
dc81e5e3 YY |
2593 | if (!tr) |
2594 | return -ENODEV; | |
2595 | ||
8781915a EG |
2596 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
2597 | ||
2598 | call = *iter; | |
2599 | ret = event_init(call); | |
2600 | if (!ret) | |
2601 | list_add(&call->list, &ftrace_events); | |
2602 | } | |
2603 | ||
77248221 SR |
2604 | /* |
2605 | * We need the top trace array to have a working set of trace | |
2606 | * points at early init, before the debug files and directories | |
2607 | * are created. Create the file entries now, and attach them | |
2608 | * to the actual file dentries later. | |
2609 | */ | |
2610 | __trace_early_add_events(tr); | |
2611 | ||
ce1039bd | 2612 | early_enable_events(tr, false); |
81698831 SR |
2613 | |
2614 | trace_printk_start_comm(); | |
2615 | ||
3cd715de SRRH |
2616 | register_event_cmds(); |
2617 | ||
85f2b082 TZ |
2618 | register_trigger_cmds(); |
2619 | ||
8781915a EG |
2620 | return 0; |
2621 | } | |
2622 | ||
ce1039bd SRRH |
2623 | /* |
2624 | * event_trace_enable() is called from trace_event_init() first to | |
2625 | * initialize events and perhaps start any events that are on the | |
2626 | * command line. Unfortunately, there are some events that will not | |
2627 | * start this early, like the system call tracepoints that need | |
2628 | * to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable() | |
2629 | * is called before pid 1 starts, and this flag is never set, making | |
2630 | * the syscall tracepoint never get reached, but the event is enabled | |
2631 | * regardless (and not doing anything). | |
2632 | */ | |
2633 | static __init int event_trace_enable_again(void) | |
2634 | { | |
2635 | struct trace_array *tr; | |
2636 | ||
2637 | tr = top_trace_array(); | |
2638 | if (!tr) | |
2639 | return -ENODEV; | |
2640 | ||
2641 | early_enable_events(tr, true); | |
2642 | ||
2643 | return 0; | |
2644 | } | |
2645 | ||
2646 | early_initcall(event_trace_enable_again); | |
2647 | ||
b77e38aa SR |
2648 | static __init int event_trace_init(void) |
2649 | { | |
ae63b31e | 2650 | struct trace_array *tr; |
b77e38aa SR |
2651 | struct dentry *d_tracer; |
2652 | struct dentry *entry; | |
6d723736 | 2653 | int ret; |
b77e38aa | 2654 | |
ae63b31e | 2655 | tr = top_trace_array(); |
dc81e5e3 YY |
2656 | if (!tr) |
2657 | return -ENODEV; | |
ae63b31e | 2658 | |
b77e38aa | 2659 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 2660 | if (IS_ERR(d_tracer)) |
b77e38aa SR |
2661 | return 0; |
2662 | ||
2314c4ae | 2663 | entry = debugfs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 2664 | tr, &ftrace_avail_fops); |
2314c4ae | 2665 | if (!entry) |
3448bac3 | 2666 | pr_warn("Could not create debugfs 'available_events' entry\n"); |
2314c4ae | 2667 | |
8728fe50 | 2668 | if (trace_define_common_fields()) |
3448bac3 | 2669 | pr_warn("tracing: Failed to allocate common fields"); |
8728fe50 | 2670 | |
77248221 | 2671 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
2672 | if (ret) |
2673 | return ret; | |
020e5f85 | 2674 | |
836d481e | 2675 | #ifdef CONFIG_MODULES |
6d723736 | 2676 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 2677 | if (ret) |
3448bac3 | 2678 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 2679 | #endif |
b77e38aa SR |
2680 | return 0; |
2681 | } | |
5f893b26 SRRH |
2682 | |
2683 | void __init trace_event_init(void) | |
2684 | { | |
2685 | event_trace_memsetup(); | |
2686 | init_ftrace_syscalls(); | |
2687 | event_trace_enable(); | |
2688 | } | |
2689 | ||
b77e38aa | 2690 | fs_initcall(event_trace_init); |
e6187007 SR |
2691 | |
2692 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
2693 | ||
2694 | static DEFINE_SPINLOCK(test_spinlock); | |
2695 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
2696 | static DEFINE_MUTEX(test_mutex); | |
2697 | ||
2698 | static __init void test_work(struct work_struct *dummy) | |
2699 | { | |
2700 | spin_lock(&test_spinlock); | |
2701 | spin_lock_irq(&test_spinlock_irq); | |
2702 | udelay(1); | |
2703 | spin_unlock_irq(&test_spinlock_irq); | |
2704 | spin_unlock(&test_spinlock); | |
2705 | ||
2706 | mutex_lock(&test_mutex); | |
2707 | msleep(1); | |
2708 | mutex_unlock(&test_mutex); | |
2709 | } | |
2710 | ||
2711 | static __init int event_test_thread(void *unused) | |
2712 | { | |
2713 | void *test_malloc; | |
2714 | ||
2715 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
2716 | if (!test_malloc) | |
2717 | pr_info("failed to kmalloc\n"); | |
2718 | ||
2719 | schedule_on_each_cpu(test_work); | |
2720 | ||
2721 | kfree(test_malloc); | |
2722 | ||
2723 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 2724 | while (!kthread_should_stop()) { |
e6187007 | 2725 | schedule(); |
fe0e01c7 PZ |
2726 | set_current_state(TASK_INTERRUPTIBLE); |
2727 | } | |
2728 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
2729 | |
2730 | return 0; | |
2731 | } | |
2732 | ||
2733 | /* | |
2734 | * Do various things that may trigger events. | |
2735 | */ | |
2736 | static __init void event_test_stuff(void) | |
2737 | { | |
2738 | struct task_struct *test_thread; | |
2739 | ||
2740 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
2741 | msleep(1); | |
2742 | kthread_stop(test_thread); | |
2743 | } | |
2744 | ||
2745 | /* | |
2746 | * For every trace event defined, we will test each trace point separately, | |
2747 | * and then by groups, and finally all trace points. | |
2748 | */ | |
9ea21c1e | 2749 | static __init void event_trace_self_tests(void) |
e6187007 | 2750 | { |
ae63b31e SR |
2751 | struct ftrace_subsystem_dir *dir; |
2752 | struct ftrace_event_file *file; | |
e6187007 SR |
2753 | struct ftrace_event_call *call; |
2754 | struct event_subsystem *system; | |
ae63b31e | 2755 | struct trace_array *tr; |
e6187007 SR |
2756 | int ret; |
2757 | ||
ae63b31e | 2758 | tr = top_trace_array(); |
dc81e5e3 YY |
2759 | if (!tr) |
2760 | return; | |
ae63b31e | 2761 | |
e6187007 SR |
2762 | pr_info("Running tests on trace events:\n"); |
2763 | ||
ae63b31e SR |
2764 | list_for_each_entry(file, &tr->events, list) { |
2765 | ||
2766 | call = file->event_call; | |
e6187007 | 2767 | |
2239291a SR |
2768 | /* Only test those that have a probe */ |
2769 | if (!call->class || !call->class->probe) | |
e6187007 SR |
2770 | continue; |
2771 | ||
1f5a6b45 SR |
2772 | /* |
2773 | * Testing syscall events here is pretty useless, but | |
2774 | * we still do it if configured. But this is time consuming. | |
2775 | * What we really need is a user thread to perform the | |
2776 | * syscalls as we test. | |
2777 | */ | |
2778 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
2779 | if (call->class->system && |
2780 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
2781 | continue; |
2782 | #endif | |
2783 | ||
de7b2973 | 2784 | pr_info("Testing event %s: ", ftrace_event_name(call)); |
e6187007 SR |
2785 | |
2786 | /* | |
2787 | * If an event is already enabled, someone is using | |
2788 | * it and the self test should not be on. | |
2789 | */ | |
ae63b31e | 2790 | if (file->flags & FTRACE_EVENT_FL_ENABLED) { |
3448bac3 | 2791 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
2792 | WARN_ON_ONCE(1); |
2793 | continue; | |
2794 | } | |
2795 | ||
ae63b31e | 2796 | ftrace_event_enable_disable(file, 1); |
e6187007 | 2797 | event_test_stuff(); |
ae63b31e | 2798 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
2799 | |
2800 | pr_cont("OK\n"); | |
2801 | } | |
2802 | ||
2803 | /* Now test at the sub system level */ | |
2804 | ||
2805 | pr_info("Running tests on trace event systems:\n"); | |
2806 | ||
ae63b31e SR |
2807 | list_for_each_entry(dir, &tr->systems, list) { |
2808 | ||
2809 | system = dir->subsystem; | |
e6187007 SR |
2810 | |
2811 | /* the ftrace system is special, skip it */ | |
2812 | if (strcmp(system->name, "ftrace") == 0) | |
2813 | continue; | |
2814 | ||
2815 | pr_info("Testing event system %s: ", system->name); | |
2816 | ||
ae63b31e | 2817 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 2818 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
2819 | pr_warn("error enabling system %s\n", |
2820 | system->name); | |
e6187007 SR |
2821 | continue; |
2822 | } | |
2823 | ||
2824 | event_test_stuff(); | |
2825 | ||
ae63b31e | 2826 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 2827 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
2828 | pr_warn("error disabling system %s\n", |
2829 | system->name); | |
76bab1b7 YL |
2830 | continue; |
2831 | } | |
e6187007 SR |
2832 | |
2833 | pr_cont("OK\n"); | |
2834 | } | |
2835 | ||
2836 | /* Test with all events enabled */ | |
2837 | ||
2838 | pr_info("Running tests on all trace events:\n"); | |
2839 | pr_info("Testing all events: "); | |
2840 | ||
ae63b31e | 2841 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 2842 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 2843 | pr_warn("error enabling all events\n"); |
9ea21c1e | 2844 | return; |
e6187007 SR |
2845 | } |
2846 | ||
2847 | event_test_stuff(); | |
2848 | ||
2849 | /* reset sysname */ | |
ae63b31e | 2850 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 2851 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 2852 | pr_warn("error disabling all events\n"); |
9ea21c1e | 2853 | return; |
e6187007 SR |
2854 | } |
2855 | ||
2856 | pr_cont("OK\n"); | |
9ea21c1e SR |
2857 | } |
2858 | ||
2859 | #ifdef CONFIG_FUNCTION_TRACER | |
2860 | ||
245b2e70 | 2861 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e SR |
2862 | |
2863 | static void | |
2f5f6ad9 | 2864 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 2865 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
2866 | { |
2867 | struct ring_buffer_event *event; | |
e77405ad | 2868 | struct ring_buffer *buffer; |
9ea21c1e SR |
2869 | struct ftrace_entry *entry; |
2870 | unsigned long flags; | |
2871 | long disabled; | |
9ea21c1e SR |
2872 | int cpu; |
2873 | int pc; | |
2874 | ||
2875 | pc = preempt_count(); | |
5168ae50 | 2876 | preempt_disable_notrace(); |
9ea21c1e | 2877 | cpu = raw_smp_processor_id(); |
245b2e70 | 2878 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
2879 | |
2880 | if (disabled != 1) | |
2881 | goto out; | |
2882 | ||
2883 | local_save_flags(flags); | |
2884 | ||
e77405ad SR |
2885 | event = trace_current_buffer_lock_reserve(&buffer, |
2886 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
2887 | flags, pc); |
2888 | if (!event) | |
2889 | goto out; | |
2890 | entry = ring_buffer_event_data(event); | |
2891 | entry->ip = ip; | |
2892 | entry->parent_ip = parent_ip; | |
2893 | ||
0d5c6e1c | 2894 | trace_buffer_unlock_commit(buffer, event, flags, pc); |
9ea21c1e SR |
2895 | |
2896 | out: | |
245b2e70 | 2897 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 2898 | preempt_enable_notrace(); |
9ea21c1e SR |
2899 | } |
2900 | ||
2901 | static struct ftrace_ops trace_ops __initdata = | |
2902 | { | |
2903 | .func = function_test_events_call, | |
4740974a | 2904 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
2905 | }; |
2906 | ||
2907 | static __init void event_trace_self_test_with_function(void) | |
2908 | { | |
17bb615a SR |
2909 | int ret; |
2910 | ret = register_ftrace_function(&trace_ops); | |
2911 | if (WARN_ON(ret < 0)) { | |
2912 | pr_info("Failed to enable function tracer for event tests\n"); | |
2913 | return; | |
2914 | } | |
9ea21c1e SR |
2915 | pr_info("Running tests again, along with the function tracer\n"); |
2916 | event_trace_self_tests(); | |
2917 | unregister_ftrace_function(&trace_ops); | |
2918 | } | |
2919 | #else | |
2920 | static __init void event_trace_self_test_with_function(void) | |
2921 | { | |
2922 | } | |
2923 | #endif | |
2924 | ||
2925 | static __init int event_trace_self_tests_init(void) | |
2926 | { | |
020e5f85 LZ |
2927 | if (!tracing_selftest_disabled) { |
2928 | event_trace_self_tests(); | |
2929 | event_trace_self_test_with_function(); | |
2930 | } | |
e6187007 SR |
2931 | |
2932 | return 0; | |
2933 | } | |
2934 | ||
28d20e2d | 2935 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
2936 | |
2937 | #endif |