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> | |
8434dc93 | 16 | #include <linux/tracefs.h> |
b77e38aa SR |
17 | #include <linux/uaccess.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/ctype.h> | |
49090107 | 20 | #include <linux/sort.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
e6187007 | 22 | #include <linux/delay.h> |
b77e38aa | 23 | |
3fdaf80f SRRH |
24 | #include <trace/events/sched.h> |
25 | ||
020e5f85 LZ |
26 | #include <asm/setup.h> |
27 | ||
91729ef9 | 28 | #include "trace_output.h" |
b77e38aa | 29 | |
4e5292ea | 30 | #undef TRACE_SYSTEM |
b628b3e6 SR |
31 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
32 | ||
20c8928a | 33 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 34 | |
a59fd602 | 35 | LIST_HEAD(ftrace_events); |
9f616680 | 36 | static LIST_HEAD(ftrace_generic_fields); |
b3a8c6fd | 37 | static LIST_HEAD(ftrace_common_fields); |
a59fd602 | 38 | |
d1a29143 SR |
39 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
40 | ||
41 | static struct kmem_cache *field_cachep; | |
42 | static struct kmem_cache *file_cachep; | |
43 | ||
6e94a780 SR |
44 | static inline int system_refcount(struct event_subsystem *system) |
45 | { | |
79ac6ef5 | 46 | return system->ref_count; |
6e94a780 SR |
47 | } |
48 | ||
49 | static int system_refcount_inc(struct event_subsystem *system) | |
50 | { | |
79ac6ef5 | 51 | return system->ref_count++; |
6e94a780 SR |
52 | } |
53 | ||
54 | static int system_refcount_dec(struct event_subsystem *system) | |
55 | { | |
79ac6ef5 | 56 | return --system->ref_count; |
6e94a780 SR |
57 | } |
58 | ||
ae63b31e SR |
59 | /* Double loops, do not use break, only goto's work */ |
60 | #define do_for_each_event_file(tr, file) \ | |
61 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
62 | list_for_each_entry(file, &tr->events, list) | |
63 | ||
64 | #define do_for_each_event_file_safe(tr, file) \ | |
65 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
7f1d2f82 | 66 | struct trace_event_file *___n; \ |
ae63b31e SR |
67 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
68 | ||
69 | #define while_for_each_event_file() \ | |
70 | } | |
71 | ||
b3a8c6fd | 72 | static struct list_head * |
2425bcb9 | 73 | trace_get_fields(struct trace_event_call *event_call) |
2e33af02 SR |
74 | { |
75 | if (!event_call->class->get_fields) | |
76 | return &event_call->class->fields; | |
77 | return event_call->class->get_fields(event_call); | |
78 | } | |
79 | ||
b3a8c6fd J |
80 | static struct ftrace_event_field * |
81 | __find_event_field(struct list_head *head, char *name) | |
82 | { | |
83 | struct ftrace_event_field *field; | |
84 | ||
85 | list_for_each_entry(field, head, link) { | |
86 | if (!strcmp(field->name, name)) | |
87 | return field; | |
88 | } | |
89 | ||
90 | return NULL; | |
91 | } | |
92 | ||
93 | struct ftrace_event_field * | |
2425bcb9 | 94 | trace_find_event_field(struct trace_event_call *call, char *name) |
b3a8c6fd J |
95 | { |
96 | struct ftrace_event_field *field; | |
97 | struct list_head *head; | |
98 | ||
e57cbaf0 SRRH |
99 | head = trace_get_fields(call); |
100 | field = __find_event_field(head, name); | |
9f616680 DW |
101 | if (field) |
102 | return field; | |
103 | ||
e57cbaf0 | 104 | field = __find_event_field(&ftrace_generic_fields, name); |
b3a8c6fd J |
105 | if (field) |
106 | return field; | |
107 | ||
e57cbaf0 | 108 | return __find_event_field(&ftrace_common_fields, name); |
b3a8c6fd J |
109 | } |
110 | ||
8728fe50 LZ |
111 | static int __trace_define_field(struct list_head *head, const char *type, |
112 | const char *name, int offset, int size, | |
113 | int is_signed, int filter_type) | |
cf027f64 TZ |
114 | { |
115 | struct ftrace_event_field *field; | |
116 | ||
d1a29143 | 117 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 118 | if (!field) |
aaf6ac0f | 119 | return -ENOMEM; |
fe9f57f2 | 120 | |
92edca07 SR |
121 | field->name = name; |
122 | field->type = type; | |
fe9f57f2 | 123 | |
43b51ead LZ |
124 | if (filter_type == FILTER_OTHER) |
125 | field->filter_type = filter_assign_type(type); | |
126 | else | |
127 | field->filter_type = filter_type; | |
128 | ||
cf027f64 TZ |
129 | field->offset = offset; |
130 | field->size = size; | |
a118e4d1 | 131 | field->is_signed = is_signed; |
aa38e9fc | 132 | |
2e33af02 | 133 | list_add(&field->link, head); |
cf027f64 TZ |
134 | |
135 | return 0; | |
cf027f64 | 136 | } |
8728fe50 | 137 | |
2425bcb9 | 138 | int trace_define_field(struct trace_event_call *call, const char *type, |
8728fe50 LZ |
139 | const char *name, int offset, int size, int is_signed, |
140 | int filter_type) | |
141 | { | |
142 | struct list_head *head; | |
143 | ||
144 | if (WARN_ON(!call->class)) | |
145 | return 0; | |
146 | ||
147 | head = trace_get_fields(call); | |
148 | return __trace_define_field(head, type, name, offset, size, | |
149 | is_signed, filter_type); | |
150 | } | |
17c873ec | 151 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 152 | |
9f616680 DW |
153 | #define __generic_field(type, item, filter_type) \ |
154 | ret = __trace_define_field(&ftrace_generic_fields, #type, \ | |
155 | #item, 0, 0, is_signed_type(type), \ | |
156 | filter_type); \ | |
157 | if (ret) \ | |
158 | return ret; | |
159 | ||
e647d6b3 | 160 | #define __common_field(type, item) \ |
8728fe50 LZ |
161 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
162 | "common_" #item, \ | |
163 | offsetof(typeof(ent), item), \ | |
164 | sizeof(ent.item), \ | |
165 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
166 | if (ret) \ |
167 | return ret; | |
168 | ||
9f616680 DW |
169 | static int trace_define_generic_fields(void) |
170 | { | |
171 | int ret; | |
172 | ||
e57cbaf0 SRRH |
173 | __generic_field(int, CPU, FILTER_CPU); |
174 | __generic_field(int, cpu, FILTER_CPU); | |
175 | __generic_field(char *, COMM, FILTER_COMM); | |
176 | __generic_field(char *, comm, FILTER_COMM); | |
9f616680 DW |
177 | |
178 | return ret; | |
179 | } | |
180 | ||
8728fe50 | 181 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
182 | { |
183 | int ret; | |
184 | struct trace_entry ent; | |
185 | ||
186 | __common_field(unsigned short, type); | |
187 | __common_field(unsigned char, flags); | |
188 | __common_field(unsigned char, preempt_count); | |
189 | __common_field(int, pid); | |
e647d6b3 LZ |
190 | |
191 | return ret; | |
192 | } | |
193 | ||
2425bcb9 | 194 | static void trace_destroy_fields(struct trace_event_call *call) |
2df75e41 LZ |
195 | { |
196 | struct ftrace_event_field *field, *next; | |
2e33af02 | 197 | struct list_head *head; |
2df75e41 | 198 | |
2e33af02 SR |
199 | head = trace_get_fields(call); |
200 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 201 | list_del(&field->link); |
d1a29143 | 202 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
203 | } |
204 | } | |
205 | ||
32bbe007 AS |
206 | /* |
207 | * run-time version of trace_event_get_offsets_<call>() that returns the last | |
208 | * accessible offset of trace fields excluding __dynamic_array bytes | |
209 | */ | |
210 | int trace_event_get_offsets(struct trace_event_call *call) | |
211 | { | |
212 | struct ftrace_event_field *tail; | |
213 | struct list_head *head; | |
214 | ||
215 | head = trace_get_fields(call); | |
216 | /* | |
217 | * head->next points to the last field with the largest offset, | |
218 | * since it was added last by trace_define_field() | |
219 | */ | |
220 | tail = list_first_entry(head, struct ftrace_event_field, link); | |
221 | return tail->offset + tail->size; | |
222 | } | |
223 | ||
2425bcb9 | 224 | int trace_event_raw_init(struct trace_event_call *call) |
87d9b4e1 LZ |
225 | { |
226 | int id; | |
227 | ||
9023c930 | 228 | id = register_trace_event(&call->event); |
87d9b4e1 LZ |
229 | if (!id) |
230 | return -ENODEV; | |
87d9b4e1 LZ |
231 | |
232 | return 0; | |
233 | } | |
234 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
235 | ||
3fdaf80f SRRH |
236 | bool trace_event_ignore_this_pid(struct trace_event_file *trace_file) |
237 | { | |
238 | struct trace_array *tr = trace_file->tr; | |
239 | struct trace_array_cpu *data; | |
240 | struct trace_pid_list *pid_list; | |
241 | ||
242 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
243 | if (!pid_list) | |
244 | return false; | |
245 | ||
246 | data = this_cpu_ptr(tr->trace_buffer.data); | |
247 | ||
248 | return data->ignore_pid; | |
249 | } | |
250 | EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid); | |
251 | ||
3f795dcf SRRH |
252 | void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, |
253 | struct trace_event_file *trace_file, | |
254 | unsigned long len) | |
3fd40d1e | 255 | { |
2425bcb9 | 256 | struct trace_event_call *event_call = trace_file->event_call; |
3fd40d1e | 257 | |
3fdaf80f SRRH |
258 | if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) && |
259 | trace_event_ignore_this_pid(trace_file)) | |
260 | return NULL; | |
261 | ||
3fd40d1e SR |
262 | local_save_flags(fbuffer->flags); |
263 | fbuffer->pc = preempt_count(); | |
e947841c SRRH |
264 | /* |
265 | * If CONFIG_PREEMPT is enabled, then the tracepoint itself disables | |
266 | * preemption (adding one to the preempt_count). Since we are | |
267 | * interested in the preempt_count at the time the tracepoint was | |
268 | * hit, we need to subtract one to offset the increment. | |
269 | */ | |
270 | if (IS_ENABLED(CONFIG_PREEMPT)) | |
271 | fbuffer->pc--; | |
7f1d2f82 | 272 | fbuffer->trace_file = trace_file; |
3fd40d1e SR |
273 | |
274 | fbuffer->event = | |
7f1d2f82 | 275 | trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, |
3fd40d1e SR |
276 | event_call->event.type, len, |
277 | fbuffer->flags, fbuffer->pc); | |
278 | if (!fbuffer->event) | |
279 | return NULL; | |
280 | ||
281 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); | |
282 | return fbuffer->entry; | |
283 | } | |
3f795dcf | 284 | EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); |
3fd40d1e | 285 | |
0daa2302 SRRH |
286 | static DEFINE_SPINLOCK(tracepoint_iter_lock); |
287 | ||
3f795dcf | 288 | static void output_printk(struct trace_event_buffer *fbuffer) |
0daa2302 | 289 | { |
2425bcb9 | 290 | struct trace_event_call *event_call; |
0daa2302 SRRH |
291 | struct trace_event *event; |
292 | unsigned long flags; | |
293 | struct trace_iterator *iter = tracepoint_print_iter; | |
294 | ||
295 | if (!iter) | |
296 | return; | |
297 | ||
7f1d2f82 | 298 | event_call = fbuffer->trace_file->event_call; |
0daa2302 SRRH |
299 | if (!event_call || !event_call->event.funcs || |
300 | !event_call->event.funcs->trace) | |
301 | return; | |
302 | ||
7f1d2f82 | 303 | event = &fbuffer->trace_file->event_call->event; |
0daa2302 SRRH |
304 | |
305 | spin_lock_irqsave(&tracepoint_iter_lock, flags); | |
306 | trace_seq_init(&iter->seq); | |
307 | iter->ent = fbuffer->entry; | |
308 | event_call->event.funcs->trace(iter, 0, event); | |
309 | trace_seq_putc(&iter->seq, 0); | |
310 | printk("%s", iter->seq.buffer); | |
311 | ||
312 | spin_unlock_irqrestore(&tracepoint_iter_lock, flags); | |
313 | } | |
314 | ||
3f795dcf | 315 | void trace_event_buffer_commit(struct trace_event_buffer *fbuffer) |
3fd40d1e | 316 | { |
0daa2302 SRRH |
317 | if (tracepoint_printk) |
318 | output_printk(fbuffer); | |
319 | ||
7f1d2f82 | 320 | event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer, |
3fd40d1e SR |
321 | fbuffer->event, fbuffer->entry, |
322 | fbuffer->flags, fbuffer->pc); | |
323 | } | |
3f795dcf | 324 | EXPORT_SYMBOL_GPL(trace_event_buffer_commit); |
3fd40d1e | 325 | |
2425bcb9 | 326 | int trace_event_reg(struct trace_event_call *call, |
9023c930 | 327 | enum trace_reg type, void *data) |
a1d0ce82 | 328 | { |
7f1d2f82 | 329 | struct trace_event_file *file = data; |
ae63b31e | 330 | |
de7b2973 | 331 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
a1d0ce82 SR |
332 | switch (type) { |
333 | case TRACE_REG_REGISTER: | |
de7b2973 | 334 | return tracepoint_probe_register(call->tp, |
a1d0ce82 | 335 | call->class->probe, |
ae63b31e | 336 | file); |
a1d0ce82 | 337 | case TRACE_REG_UNREGISTER: |
de7b2973 | 338 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 | 339 | call->class->probe, |
ae63b31e | 340 | file); |
a1d0ce82 SR |
341 | return 0; |
342 | ||
343 | #ifdef CONFIG_PERF_EVENTS | |
344 | case TRACE_REG_PERF_REGISTER: | |
de7b2973 | 345 | return tracepoint_probe_register(call->tp, |
a1d0ce82 SR |
346 | call->class->perf_probe, |
347 | call); | |
348 | case TRACE_REG_PERF_UNREGISTER: | |
de7b2973 | 349 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 SR |
350 | call->class->perf_probe, |
351 | call); | |
352 | return 0; | |
ceec0b6f JO |
353 | case TRACE_REG_PERF_OPEN: |
354 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
355 | case TRACE_REG_PERF_ADD: |
356 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 357 | return 0; |
a1d0ce82 SR |
358 | #endif |
359 | } | |
360 | return 0; | |
361 | } | |
9023c930 | 362 | EXPORT_SYMBOL_GPL(trace_event_reg); |
a1d0ce82 | 363 | |
e870e9a1 LZ |
364 | void trace_event_enable_cmd_record(bool enable) |
365 | { | |
7f1d2f82 | 366 | struct trace_event_file *file; |
ae63b31e | 367 | struct trace_array *tr; |
e870e9a1 LZ |
368 | |
369 | mutex_lock(&event_mutex); | |
ae63b31e SR |
370 | do_for_each_event_file(tr, file) { |
371 | ||
5d6ad960 | 372 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) |
e870e9a1 LZ |
373 | continue; |
374 | ||
375 | if (enable) { | |
376 | tracing_start_cmdline_record(); | |
5d6ad960 | 377 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
378 | } else { |
379 | tracing_stop_cmdline_record(); | |
5d6ad960 | 380 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 381 | } |
ae63b31e | 382 | } while_for_each_event_file(); |
e870e9a1 LZ |
383 | mutex_unlock(&event_mutex); |
384 | } | |
385 | ||
7f1d2f82 | 386 | static int __ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 | 387 | int enable, int soft_disable) |
fd994989 | 388 | { |
2425bcb9 | 389 | struct trace_event_call *call = file->event_call; |
983f938a | 390 | struct trace_array *tr = file->tr; |
0fc1b09f | 391 | unsigned long file_flags = file->flags; |
3b8e4273 | 392 | int ret = 0; |
417944c4 | 393 | int disable; |
3b8e4273 | 394 | |
fd994989 SR |
395 | switch (enable) { |
396 | case 0: | |
417944c4 | 397 | /* |
1cf4c073 MH |
398 | * When soft_disable is set and enable is cleared, the sm_ref |
399 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
400 | * to clear the SOFT_DISABLED flag but leave the event in the |
401 | * state that it was. That is, if the event was enabled and | |
402 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
403 | * is set we do not want the event to be enabled before we | |
404 | * clear the bit. | |
405 | * | |
406 | * When soft_disable is not set but the SOFT_MODE flag is, | |
407 | * we do nothing. Do not disable the tracepoint, otherwise | |
408 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
409 | */ | |
410 | if (soft_disable) { | |
1cf4c073 MH |
411 | if (atomic_dec_return(&file->sm_ref) > 0) |
412 | break; | |
5d6ad960 SRRH |
413 | disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; |
414 | clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); | |
417944c4 | 415 | } else |
5d6ad960 | 416 | disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); |
417944c4 | 417 | |
5d6ad960 SRRH |
418 | if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { |
419 | clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); | |
420 | if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { | |
e870e9a1 | 421 | tracing_stop_cmdline_record(); |
5d6ad960 | 422 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 423 | } |
ae63b31e | 424 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 425 | } |
3baa5e4c | 426 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
5d6ad960 SRRH |
427 | if (file->flags & EVENT_FILE_FL_SOFT_MODE) |
428 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c | 429 | else |
5d6ad960 | 430 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
fd994989 SR |
431 | break; |
432 | case 1: | |
417944c4 SRRH |
433 | /* |
434 | * When soft_disable is set and enable is set, we want to | |
435 | * register the tracepoint for the event, but leave the event | |
436 | * as is. That means, if the event was already enabled, we do | |
437 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
438 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
439 | * it still seems to be disabled. | |
440 | */ | |
441 | if (!soft_disable) | |
5d6ad960 | 442 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
1cf4c073 MH |
443 | else { |
444 | if (atomic_inc_return(&file->sm_ref) > 1) | |
445 | break; | |
5d6ad960 | 446 | set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 447 | } |
417944c4 | 448 | |
5d6ad960 | 449 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) { |
417944c4 SRRH |
450 | |
451 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
452 | if (soft_disable) | |
5d6ad960 | 453 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
417944c4 | 454 | |
983f938a | 455 | if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { |
e870e9a1 | 456 | tracing_start_cmdline_record(); |
5d6ad960 | 457 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 458 | } |
ae63b31e | 459 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
460 | if (ret) { |
461 | tracing_stop_cmdline_record(); | |
462 | pr_info("event trace: Could not enable event " | |
687fcc4a | 463 | "%s\n", trace_event_name(call)); |
3b8e4273 LZ |
464 | break; |
465 | } | |
5d6ad960 | 466 | set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
467 | |
468 | /* WAS_ENABLED gets set but never cleared. */ | |
469 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; | |
fd994989 | 470 | } |
fd994989 SR |
471 | break; |
472 | } | |
3b8e4273 | 473 | |
0fc1b09f SRRH |
474 | /* Enable or disable use of trace_buffered_event */ |
475 | if ((file_flags & EVENT_FILE_FL_SOFT_DISABLED) != | |
476 | (file->flags & EVENT_FILE_FL_SOFT_DISABLED)) { | |
477 | if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) | |
478 | trace_buffered_event_enable(); | |
479 | else | |
480 | trace_buffered_event_disable(); | |
481 | } | |
482 | ||
3b8e4273 | 483 | return ret; |
fd994989 SR |
484 | } |
485 | ||
7f1d2f82 | 486 | int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 TZ |
487 | int enable, int soft_disable) |
488 | { | |
489 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
490 | } | |
491 | ||
7f1d2f82 | 492 | static int ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 SRRH |
493 | int enable) |
494 | { | |
495 | return __ftrace_event_enable_disable(file, enable, 0); | |
496 | } | |
497 | ||
ae63b31e | 498 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 499 | { |
7f1d2f82 | 500 | struct trace_event_file *file; |
0e907c99 Z |
501 | |
502 | mutex_lock(&event_mutex); | |
ae63b31e SR |
503 | list_for_each_entry(file, &tr->events, list) { |
504 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
505 | } |
506 | mutex_unlock(&event_mutex); | |
507 | } | |
508 | ||
c37775d5 SR |
509 | static void |
510 | event_filter_pid_sched_process_exit(void *data, struct task_struct *task) | |
511 | { | |
512 | struct trace_pid_list *pid_list; | |
513 | struct trace_array *tr = data; | |
514 | ||
515 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
4e267db1 | 516 | trace_filter_add_remove_task(pid_list, NULL, task); |
c37775d5 SR |
517 | } |
518 | ||
519 | static void | |
520 | event_filter_pid_sched_process_fork(void *data, | |
521 | struct task_struct *self, | |
522 | struct task_struct *task) | |
523 | { | |
524 | struct trace_pid_list *pid_list; | |
525 | struct trace_array *tr = data; | |
526 | ||
527 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
4e267db1 | 528 | trace_filter_add_remove_task(pid_list, self, task); |
c37775d5 SR |
529 | } |
530 | ||
531 | void trace_event_follow_fork(struct trace_array *tr, bool enable) | |
532 | { | |
533 | if (enable) { | |
534 | register_trace_prio_sched_process_fork(event_filter_pid_sched_process_fork, | |
535 | tr, INT_MIN); | |
536 | register_trace_prio_sched_process_exit(event_filter_pid_sched_process_exit, | |
537 | tr, INT_MAX); | |
538 | } else { | |
539 | unregister_trace_sched_process_fork(event_filter_pid_sched_process_fork, | |
540 | tr); | |
541 | unregister_trace_sched_process_exit(event_filter_pid_sched_process_exit, | |
542 | tr); | |
543 | } | |
3fdaf80f SRRH |
544 | } |
545 | ||
546 | static void | |
22402cd0 | 547 | event_filter_pid_sched_switch_probe_pre(void *data, bool preempt, |
3fdaf80f SRRH |
548 | struct task_struct *prev, struct task_struct *next) |
549 | { | |
550 | struct trace_array *tr = data; | |
551 | struct trace_pid_list *pid_list; | |
552 | ||
553 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
554 | ||
555 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 SR |
556 | trace_ignore_this_task(pid_list, prev) && |
557 | trace_ignore_this_task(pid_list, next)); | |
3fdaf80f SRRH |
558 | } |
559 | ||
560 | static void | |
22402cd0 | 561 | event_filter_pid_sched_switch_probe_post(void *data, bool preempt, |
3fdaf80f SRRH |
562 | struct task_struct *prev, struct task_struct *next) |
563 | { | |
564 | struct trace_array *tr = data; | |
565 | struct trace_pid_list *pid_list; | |
566 | ||
567 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
568 | ||
569 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 570 | trace_ignore_this_task(pid_list, next)); |
3fdaf80f SRRH |
571 | } |
572 | ||
573 | static void | |
574 | event_filter_pid_sched_wakeup_probe_pre(void *data, struct task_struct *task) | |
575 | { | |
576 | struct trace_array *tr = data; | |
577 | struct trace_pid_list *pid_list; | |
578 | ||
579 | /* Nothing to do if we are already tracing */ | |
580 | if (!this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
581 | return; | |
582 | ||
583 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
584 | ||
585 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 586 | trace_ignore_this_task(pid_list, task)); |
3fdaf80f SRRH |
587 | } |
588 | ||
589 | static void | |
590 | event_filter_pid_sched_wakeup_probe_post(void *data, struct task_struct *task) | |
591 | { | |
592 | struct trace_array *tr = data; | |
593 | struct trace_pid_list *pid_list; | |
594 | ||
595 | /* Nothing to do if we are not tracing */ | |
596 | if (this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
597 | return; | |
598 | ||
599 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
600 | ||
601 | /* Set tracing if current is enabled */ | |
602 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 603 | trace_ignore_this_task(pid_list, current)); |
3fdaf80f SRRH |
604 | } |
605 | ||
49090107 SRRH |
606 | static void __ftrace_clear_event_pids(struct trace_array *tr) |
607 | { | |
608 | struct trace_pid_list *pid_list; | |
3fdaf80f SRRH |
609 | struct trace_event_file *file; |
610 | int cpu; | |
49090107 SRRH |
611 | |
612 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
613 | lockdep_is_held(&event_mutex)); | |
614 | if (!pid_list) | |
615 | return; | |
616 | ||
3fdaf80f SRRH |
617 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_pre, tr); |
618 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_post, tr); | |
619 | ||
620 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, tr); | |
621 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, tr); | |
622 | ||
0f72e37e SRRH |
623 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, tr); |
624 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, tr); | |
625 | ||
626 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_pre, tr); | |
627 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_post, tr); | |
628 | ||
3fdaf80f SRRH |
629 | list_for_each_entry(file, &tr->events, list) { |
630 | clear_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
631 | } | |
632 | ||
633 | for_each_possible_cpu(cpu) | |
634 | per_cpu_ptr(tr->trace_buffer.data, cpu)->ignore_pid = false; | |
635 | ||
49090107 SRRH |
636 | rcu_assign_pointer(tr->filtered_pids, NULL); |
637 | ||
638 | /* Wait till all users are no longer using pid filtering */ | |
639 | synchronize_sched(); | |
640 | ||
76c813e2 | 641 | trace_free_pid_list(pid_list); |
49090107 SRRH |
642 | } |
643 | ||
644 | static void ftrace_clear_event_pids(struct trace_array *tr) | |
645 | { | |
646 | mutex_lock(&event_mutex); | |
647 | __ftrace_clear_event_pids(tr); | |
648 | mutex_unlock(&event_mutex); | |
649 | } | |
650 | ||
e9dbfae5 SR |
651 | static void __put_system(struct event_subsystem *system) |
652 | { | |
653 | struct event_filter *filter = system->filter; | |
654 | ||
6e94a780 SR |
655 | WARN_ON_ONCE(system_refcount(system) == 0); |
656 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
657 | return; |
658 | ||
ae63b31e SR |
659 | list_del(&system->list); |
660 | ||
e9dbfae5 SR |
661 | if (filter) { |
662 | kfree(filter->filter_string); | |
663 | kfree(filter); | |
664 | } | |
79ac6ef5 | 665 | kfree_const(system->name); |
e9dbfae5 SR |
666 | kfree(system); |
667 | } | |
668 | ||
669 | static void __get_system(struct event_subsystem *system) | |
670 | { | |
6e94a780 SR |
671 | WARN_ON_ONCE(system_refcount(system) == 0); |
672 | system_refcount_inc(system); | |
e9dbfae5 SR |
673 | } |
674 | ||
7967b3e0 | 675 | static void __get_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
676 | { |
677 | WARN_ON_ONCE(dir->ref_count == 0); | |
678 | dir->ref_count++; | |
679 | __get_system(dir->subsystem); | |
680 | } | |
681 | ||
7967b3e0 | 682 | static void __put_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
683 | { |
684 | WARN_ON_ONCE(dir->ref_count == 0); | |
685 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 686 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
687 | |
688 | __put_system(dir->subsystem); | |
689 | if (!--dir->ref_count) | |
690 | kfree(dir); | |
691 | } | |
692 | ||
7967b3e0 | 693 | static void put_system(struct trace_subsystem_dir *dir) |
e9dbfae5 SR |
694 | { |
695 | mutex_lock(&event_mutex); | |
ae63b31e | 696 | __put_system_dir(dir); |
e9dbfae5 SR |
697 | mutex_unlock(&event_mutex); |
698 | } | |
699 | ||
7967b3e0 | 700 | static void remove_subsystem(struct trace_subsystem_dir *dir) |
f6a84bdc ON |
701 | { |
702 | if (!dir) | |
703 | return; | |
704 | ||
705 | if (!--dir->nr_events) { | |
8434dc93 | 706 | tracefs_remove_recursive(dir->entry); |
f6a84bdc ON |
707 | list_del(&dir->list); |
708 | __put_system_dir(dir); | |
709 | } | |
710 | } | |
711 | ||
7f1d2f82 | 712 | static void remove_event_file_dir(struct trace_event_file *file) |
f6a84bdc | 713 | { |
bf682c31 ON |
714 | struct dentry *dir = file->dir; |
715 | struct dentry *child; | |
716 | ||
717 | if (dir) { | |
718 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
946e51f2 | 719 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
7682c918 DH |
720 | if (d_really_is_positive(child)) /* probably unneeded */ |
721 | d_inode(child)->i_private = NULL; | |
bf682c31 ON |
722 | } |
723 | spin_unlock(&dir->d_lock); | |
724 | ||
8434dc93 | 725 | tracefs_remove_recursive(dir); |
bf682c31 ON |
726 | } |
727 | ||
f6a84bdc | 728 | list_del(&file->list); |
f6a84bdc | 729 | remove_subsystem(file->system); |
2448e349 | 730 | free_event_filter(file->filter); |
f6a84bdc ON |
731 | kmem_cache_free(file_cachep, file); |
732 | } | |
733 | ||
8f31bfe5 LZ |
734 | /* |
735 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
736 | */ | |
2a6c24af SRRH |
737 | static int |
738 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
739 | const char *sub, const char *event, int set) | |
b77e38aa | 740 | { |
7f1d2f82 | 741 | struct trace_event_file *file; |
2425bcb9 | 742 | struct trace_event_call *call; |
de7b2973 | 743 | const char *name; |
29f93943 | 744 | int ret = -EINVAL; |
8f31bfe5 | 745 | |
ae63b31e SR |
746 | list_for_each_entry(file, &tr->events, list) { |
747 | ||
748 | call = file->event_call; | |
687fcc4a | 749 | name = trace_event_name(call); |
8f31bfe5 | 750 | |
de7b2973 | 751 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
752 | continue; |
753 | ||
9b63776f SR |
754 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
755 | continue; | |
756 | ||
8f31bfe5 | 757 | if (match && |
de7b2973 | 758 | strcmp(match, name) != 0 && |
8f082018 | 759 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
760 | continue; |
761 | ||
8f082018 | 762 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
763 | continue; |
764 | ||
de7b2973 | 765 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
766 | continue; |
767 | ||
ae63b31e | 768 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
769 | |
770 | ret = 0; | |
771 | } | |
2a6c24af SRRH |
772 | |
773 | return ret; | |
774 | } | |
775 | ||
776 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
777 | const char *sub, const char *event, int set) | |
778 | { | |
779 | int ret; | |
780 | ||
781 | mutex_lock(&event_mutex); | |
782 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
783 | mutex_unlock(&event_mutex); |
784 | ||
785 | return ret; | |
786 | } | |
787 | ||
ae63b31e | 788 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 789 | { |
b628b3e6 | 790 | char *event = NULL, *sub = NULL, *match; |
84fce9db | 791 | int ret; |
b628b3e6 SR |
792 | |
793 | /* | |
794 | * The buf format can be <subsystem>:<event-name> | |
795 | * *:<event-name> means any event by that name. | |
796 | * :<event-name> is the same. | |
797 | * | |
798 | * <subsystem>:* means all events in that subsystem | |
799 | * <subsystem>: means the same. | |
800 | * | |
801 | * <name> (no ':') means all events in a subsystem with | |
802 | * the name <name> or any event that matches <name> | |
803 | */ | |
804 | ||
805 | match = strsep(&buf, ":"); | |
806 | if (buf) { | |
807 | sub = match; | |
808 | event = buf; | |
809 | match = NULL; | |
810 | ||
811 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
812 | sub = NULL; | |
813 | if (!strlen(event) || strcmp(event, "*") == 0) | |
814 | event = NULL; | |
815 | } | |
b77e38aa | 816 | |
84fce9db JK |
817 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
818 | ||
819 | /* Put back the colon to allow this to be called again */ | |
820 | if (buf) | |
821 | *(buf - 1) = ':'; | |
822 | ||
823 | return ret; | |
b77e38aa SR |
824 | } |
825 | ||
4671c794 SR |
826 | /** |
827 | * trace_set_clr_event - enable or disable an event | |
828 | * @system: system name to match (NULL for any system) | |
829 | * @event: event name to match (NULL for all events, within system) | |
830 | * @set: 1 to enable, 0 to disable | |
831 | * | |
832 | * This is a way for other parts of the kernel to enable or disable | |
833 | * event recording. | |
834 | * | |
835 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
836 | * registered events. | |
837 | */ | |
838 | int trace_set_clr_event(const char *system, const char *event, int set) | |
839 | { | |
ae63b31e SR |
840 | struct trace_array *tr = top_trace_array(); |
841 | ||
dc81e5e3 YY |
842 | if (!tr) |
843 | return -ENODEV; | |
844 | ||
ae63b31e | 845 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 846 | } |
56355b83 | 847 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 848 | |
b77e38aa SR |
849 | /* 128 should be much more than enough */ |
850 | #define EVENT_BUF_SIZE 127 | |
851 | ||
852 | static ssize_t | |
853 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
854 | size_t cnt, loff_t *ppos) | |
855 | { | |
48966364 | 856 | struct trace_parser parser; |
ae63b31e SR |
857 | struct seq_file *m = file->private_data; |
858 | struct trace_array *tr = m->private; | |
4ba7978e | 859 | ssize_t read, ret; |
b77e38aa | 860 | |
4ba7978e | 861 | if (!cnt) |
b77e38aa SR |
862 | return 0; |
863 | ||
1852fcce SR |
864 | ret = tracing_update_buffers(); |
865 | if (ret < 0) | |
866 | return ret; | |
867 | ||
48966364 | 868 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
869 | return -ENOMEM; |
870 | ||
48966364 | 871 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
872 | ||
4ba7978e | 873 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 874 | int set = 1; |
b77e38aa | 875 | |
48966364 | 876 | if (*parser.buffer == '!') |
b77e38aa | 877 | set = 0; |
b77e38aa | 878 | |
48966364 | 879 | parser.buffer[parser.idx] = 0; |
880 | ||
ae63b31e | 881 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 882 | if (ret) |
48966364 | 883 | goto out_put; |
b77e38aa | 884 | } |
b77e38aa SR |
885 | |
886 | ret = read; | |
887 | ||
48966364 | 888 | out_put: |
889 | trace_parser_put(&parser); | |
b77e38aa SR |
890 | |
891 | return ret; | |
892 | } | |
893 | ||
894 | static void * | |
895 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
896 | { | |
7f1d2f82 | 897 | struct trace_event_file *file = v; |
2425bcb9 | 898 | struct trace_event_call *call; |
ae63b31e | 899 | struct trace_array *tr = m->private; |
b77e38aa SR |
900 | |
901 | (*pos)++; | |
902 | ||
ae63b31e SR |
903 | list_for_each_entry_continue(file, &tr->events, list) { |
904 | call = file->event_call; | |
40e26815 SR |
905 | /* |
906 | * The ftrace subsystem is for showing formats only. | |
907 | * They can not be enabled or disabled via the event files. | |
908 | */ | |
d045437a SRRH |
909 | if (call->class && call->class->reg && |
910 | !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
ae63b31e | 911 | return file; |
40e26815 | 912 | } |
b77e38aa | 913 | |
30bd39cd | 914 | return NULL; |
b77e38aa SR |
915 | } |
916 | ||
917 | static void *t_start(struct seq_file *m, loff_t *pos) | |
918 | { | |
7f1d2f82 | 919 | struct trace_event_file *file; |
ae63b31e | 920 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
921 | loff_t l; |
922 | ||
20c8928a | 923 | mutex_lock(&event_mutex); |
e1c7e2a6 | 924 | |
7f1d2f82 | 925 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 926 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
927 | file = t_next(m, file, &l); |
928 | if (!file) | |
e1c7e2a6 LZ |
929 | break; |
930 | } | |
ae63b31e | 931 | return file; |
b77e38aa SR |
932 | } |
933 | ||
934 | static void * | |
935 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
936 | { | |
7f1d2f82 | 937 | struct trace_event_file *file = v; |
ae63b31e | 938 | struct trace_array *tr = m->private; |
b77e38aa SR |
939 | |
940 | (*pos)++; | |
941 | ||
ae63b31e | 942 | list_for_each_entry_continue(file, &tr->events, list) { |
5d6ad960 | 943 | if (file->flags & EVENT_FILE_FL_ENABLED) |
ae63b31e | 944 | return file; |
b77e38aa SR |
945 | } |
946 | ||
30bd39cd | 947 | return NULL; |
b77e38aa SR |
948 | } |
949 | ||
950 | static void *s_start(struct seq_file *m, loff_t *pos) | |
951 | { | |
7f1d2f82 | 952 | struct trace_event_file *file; |
ae63b31e | 953 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
954 | loff_t l; |
955 | ||
20c8928a | 956 | mutex_lock(&event_mutex); |
e1c7e2a6 | 957 | |
7f1d2f82 | 958 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 959 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
960 | file = s_next(m, file, &l); |
961 | if (!file) | |
e1c7e2a6 LZ |
962 | break; |
963 | } | |
ae63b31e | 964 | return file; |
b77e38aa SR |
965 | } |
966 | ||
967 | static int t_show(struct seq_file *m, void *v) | |
968 | { | |
7f1d2f82 | 969 | struct trace_event_file *file = v; |
2425bcb9 | 970 | struct trace_event_call *call = file->event_call; |
b77e38aa | 971 | |
8f082018 SR |
972 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
973 | seq_printf(m, "%s:", call->class->system); | |
687fcc4a | 974 | seq_printf(m, "%s\n", trace_event_name(call)); |
b77e38aa SR |
975 | |
976 | return 0; | |
977 | } | |
978 | ||
979 | static void t_stop(struct seq_file *m, void *p) | |
980 | { | |
20c8928a | 981 | mutex_unlock(&event_mutex); |
b77e38aa SR |
982 | } |
983 | ||
f4d34a87 SR |
984 | static void * |
985 | p_next(struct seq_file *m, void *v, loff_t *pos) | |
986 | { | |
987 | struct trace_array *tr = m->private; | |
988 | struct trace_pid_list *pid_list = rcu_dereference_sched(tr->filtered_pids); | |
f4d34a87 | 989 | |
5cc8976b | 990 | return trace_pid_next(pid_list, v, pos); |
f4d34a87 SR |
991 | } |
992 | ||
49090107 | 993 | static void *p_start(struct seq_file *m, loff_t *pos) |
fb662288 | 994 | __acquires(RCU) |
49090107 SRRH |
995 | { |
996 | struct trace_pid_list *pid_list; | |
997 | struct trace_array *tr = m->private; | |
998 | ||
999 | /* | |
1000 | * Grab the mutex, to keep calls to p_next() having the same | |
1001 | * tr->filtered_pids as p_start() has. | |
1002 | * If we just passed the tr->filtered_pids around, then RCU would | |
1003 | * have been enough, but doing that makes things more complex. | |
1004 | */ | |
1005 | mutex_lock(&event_mutex); | |
1006 | rcu_read_lock_sched(); | |
1007 | ||
1008 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1009 | ||
f4d34a87 | 1010 | if (!pid_list) |
49090107 SRRH |
1011 | return NULL; |
1012 | ||
5cc8976b | 1013 | return trace_pid_start(pid_list, pos); |
49090107 SRRH |
1014 | } |
1015 | ||
1016 | static void p_stop(struct seq_file *m, void *p) | |
fb662288 | 1017 | __releases(RCU) |
49090107 SRRH |
1018 | { |
1019 | rcu_read_unlock_sched(); | |
1020 | mutex_unlock(&event_mutex); | |
1021 | } | |
1022 | ||
1473e441 SR |
1023 | static ssize_t |
1024 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1025 | loff_t *ppos) | |
1026 | { | |
7f1d2f82 | 1027 | struct trace_event_file *file; |
bc6f6b08 | 1028 | unsigned long flags; |
a4390596 TZ |
1029 | char buf[4] = "0"; |
1030 | ||
bc6f6b08 ON |
1031 | mutex_lock(&event_mutex); |
1032 | file = event_file_data(filp); | |
1033 | if (likely(file)) | |
1034 | flags = file->flags; | |
1035 | mutex_unlock(&event_mutex); | |
1036 | ||
1037 | if (!file) | |
1038 | return -ENODEV; | |
1039 | ||
5d6ad960 SRRH |
1040 | if (flags & EVENT_FILE_FL_ENABLED && |
1041 | !(flags & EVENT_FILE_FL_SOFT_DISABLED)) | |
a4390596 TZ |
1042 | strcpy(buf, "1"); |
1043 | ||
5d6ad960 SRRH |
1044 | if (flags & EVENT_FILE_FL_SOFT_DISABLED || |
1045 | flags & EVENT_FILE_FL_SOFT_MODE) | |
a4390596 TZ |
1046 | strcat(buf, "*"); |
1047 | ||
1048 | strcat(buf, "\n"); | |
1473e441 | 1049 | |
417944c4 | 1050 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
1051 | } |
1052 | ||
1053 | static ssize_t | |
1054 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1055 | loff_t *ppos) | |
1056 | { | |
7f1d2f82 | 1057 | struct trace_event_file *file; |
1473e441 SR |
1058 | unsigned long val; |
1059 | int ret; | |
1060 | ||
22fe9b54 PH |
1061 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1062 | if (ret) | |
1473e441 SR |
1063 | return ret; |
1064 | ||
1852fcce SR |
1065 | ret = tracing_update_buffers(); |
1066 | if (ret < 0) | |
1067 | return ret; | |
1068 | ||
1473e441 SR |
1069 | switch (val) { |
1070 | case 0: | |
1473e441 | 1071 | case 1: |
bc6f6b08 | 1072 | ret = -ENODEV; |
11a241a3 | 1073 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
1074 | file = event_file_data(filp); |
1075 | if (likely(file)) | |
1076 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 1077 | mutex_unlock(&event_mutex); |
1473e441 SR |
1078 | break; |
1079 | ||
1080 | default: | |
1081 | return -EINVAL; | |
1082 | } | |
1083 | ||
1084 | *ppos += cnt; | |
1085 | ||
3b8e4273 | 1086 | return ret ? ret : cnt; |
1473e441 SR |
1087 | } |
1088 | ||
8ae79a13 SR |
1089 | static ssize_t |
1090 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1091 | loff_t *ppos) | |
1092 | { | |
c142b15d | 1093 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
7967b3e0 | 1094 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1095 | struct event_subsystem *system = dir->subsystem; |
2425bcb9 | 1096 | struct trace_event_call *call; |
7f1d2f82 | 1097 | struct trace_event_file *file; |
ae63b31e | 1098 | struct trace_array *tr = dir->tr; |
8ae79a13 | 1099 | char buf[2]; |
c142b15d | 1100 | int set = 0; |
8ae79a13 SR |
1101 | int ret; |
1102 | ||
8ae79a13 | 1103 | mutex_lock(&event_mutex); |
ae63b31e SR |
1104 | list_for_each_entry(file, &tr->events, list) { |
1105 | call = file->event_call; | |
687fcc4a | 1106 | if (!trace_event_name(call) || !call->class || !call->class->reg) |
8ae79a13 SR |
1107 | continue; |
1108 | ||
40ee4dff | 1109 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
1110 | continue; |
1111 | ||
1112 | /* | |
1113 | * We need to find out if all the events are set | |
1114 | * or if all events or cleared, or if we have | |
1115 | * a mixture. | |
1116 | */ | |
5d6ad960 | 1117 | set |= (1 << !!(file->flags & EVENT_FILE_FL_ENABLED)); |
c142b15d | 1118 | |
8ae79a13 SR |
1119 | /* |
1120 | * If we have a mixture, no need to look further. | |
1121 | */ | |
c142b15d | 1122 | if (set == 3) |
8ae79a13 SR |
1123 | break; |
1124 | } | |
1125 | mutex_unlock(&event_mutex); | |
1126 | ||
c142b15d | 1127 | buf[0] = set_to_char[set]; |
8ae79a13 | 1128 | buf[1] = '\n'; |
8ae79a13 SR |
1129 | |
1130 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
1131 | ||
1132 | return ret; | |
1133 | } | |
1134 | ||
1135 | static ssize_t | |
1136 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1137 | loff_t *ppos) | |
1138 | { | |
7967b3e0 | 1139 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1140 | struct event_subsystem *system = dir->subsystem; |
40ee4dff | 1141 | const char *name = NULL; |
8ae79a13 | 1142 | unsigned long val; |
8ae79a13 SR |
1143 | ssize_t ret; |
1144 | ||
22fe9b54 PH |
1145 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1146 | if (ret) | |
8ae79a13 SR |
1147 | return ret; |
1148 | ||
1149 | ret = tracing_update_buffers(); | |
1150 | if (ret < 0) | |
1151 | return ret; | |
1152 | ||
8f31bfe5 | 1153 | if (val != 0 && val != 1) |
8ae79a13 | 1154 | return -EINVAL; |
8ae79a13 | 1155 | |
40ee4dff SR |
1156 | /* |
1157 | * Opening of "enable" adds a ref count to system, | |
1158 | * so the name is safe to use. | |
1159 | */ | |
1160 | if (system) | |
1161 | name = system->name; | |
1162 | ||
ae63b31e | 1163 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 1164 | if (ret) |
8f31bfe5 | 1165 | goto out; |
8ae79a13 SR |
1166 | |
1167 | ret = cnt; | |
1168 | ||
8f31bfe5 | 1169 | out: |
8ae79a13 SR |
1170 | *ppos += cnt; |
1171 | ||
1172 | return ret; | |
1173 | } | |
1174 | ||
2a37a3df SR |
1175 | enum { |
1176 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
1177 | FORMAT_FIELD_SEPERATOR = 2, |
1178 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
1179 | }; |
1180 | ||
1181 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 1182 | { |
2425bcb9 | 1183 | struct trace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
1184 | struct list_head *common_head = &ftrace_common_fields; |
1185 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 1186 | struct list_head *node = v; |
981d081e | 1187 | |
2a37a3df | 1188 | (*pos)++; |
5a65e956 | 1189 | |
2a37a3df SR |
1190 | switch ((unsigned long)v) { |
1191 | case FORMAT_HEADER: | |
7710b639 ON |
1192 | node = common_head; |
1193 | break; | |
5a65e956 | 1194 | |
86397dc3 | 1195 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
1196 | node = head; |
1197 | break; | |
5a65e956 | 1198 | |
2a37a3df SR |
1199 | case FORMAT_PRINTFMT: |
1200 | /* all done */ | |
1201 | return NULL; | |
5a65e956 LJ |
1202 | } |
1203 | ||
7710b639 ON |
1204 | node = node->prev; |
1205 | if (node == common_head) | |
86397dc3 | 1206 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 1207 | else if (node == head) |
2a37a3df | 1208 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
1209 | else |
1210 | return node; | |
2a37a3df SR |
1211 | } |
1212 | ||
1213 | static int f_show(struct seq_file *m, void *v) | |
1214 | { | |
2425bcb9 | 1215 | struct trace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
1216 | struct ftrace_event_field *field; |
1217 | const char *array_descriptor; | |
1218 | ||
1219 | switch ((unsigned long)v) { | |
1220 | case FORMAT_HEADER: | |
687fcc4a | 1221 | seq_printf(m, "name: %s\n", trace_event_name(call)); |
2a37a3df | 1222 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 1223 | seq_puts(m, "format:\n"); |
8728fe50 | 1224 | return 0; |
5a65e956 | 1225 | |
86397dc3 LZ |
1226 | case FORMAT_FIELD_SEPERATOR: |
1227 | seq_putc(m, '\n'); | |
1228 | return 0; | |
1229 | ||
2a37a3df SR |
1230 | case FORMAT_PRINTFMT: |
1231 | seq_printf(m, "\nprint fmt: %s\n", | |
1232 | call->print_fmt); | |
1233 | return 0; | |
981d081e | 1234 | } |
8728fe50 | 1235 | |
7710b639 | 1236 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
1237 | /* |
1238 | * Smartly shows the array type(except dynamic array). | |
1239 | * Normal: | |
1240 | * field:TYPE VAR | |
1241 | * If TYPE := TYPE[LEN], it is shown: | |
1242 | * field:TYPE VAR[LEN] | |
1243 | */ | |
1244 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 1245 | |
2a37a3df SR |
1246 | if (!strncmp(field->type, "__data_loc", 10)) |
1247 | array_descriptor = NULL; | |
8728fe50 | 1248 | |
2a37a3df SR |
1249 | if (!array_descriptor) |
1250 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1251 | field->type, field->name, field->offset, | |
1252 | field->size, !!field->is_signed); | |
1253 | else | |
1254 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1255 | (int)(array_descriptor - field->type), | |
1256 | field->type, field->name, | |
1257 | array_descriptor, field->offset, | |
1258 | field->size, !!field->is_signed); | |
8728fe50 | 1259 | |
2a37a3df SR |
1260 | return 0; |
1261 | } | |
5a65e956 | 1262 | |
7710b639 ON |
1263 | static void *f_start(struct seq_file *m, loff_t *pos) |
1264 | { | |
1265 | void *p = (void *)FORMAT_HEADER; | |
1266 | loff_t l = 0; | |
1267 | ||
c5a44a12 ON |
1268 | /* ->stop() is called even if ->start() fails */ |
1269 | mutex_lock(&event_mutex); | |
1270 | if (!event_file_data(m->private)) | |
1271 | return ERR_PTR(-ENODEV); | |
1272 | ||
7710b639 ON |
1273 | while (l < *pos && p) |
1274 | p = f_next(m, p, &l); | |
1275 | ||
1276 | return p; | |
1277 | } | |
1278 | ||
2a37a3df SR |
1279 | static void f_stop(struct seq_file *m, void *p) |
1280 | { | |
c5a44a12 | 1281 | mutex_unlock(&event_mutex); |
2a37a3df | 1282 | } |
981d081e | 1283 | |
2a37a3df SR |
1284 | static const struct seq_operations trace_format_seq_ops = { |
1285 | .start = f_start, | |
1286 | .next = f_next, | |
1287 | .stop = f_stop, | |
1288 | .show = f_show, | |
1289 | }; | |
1290 | ||
1291 | static int trace_format_open(struct inode *inode, struct file *file) | |
1292 | { | |
2a37a3df SR |
1293 | struct seq_file *m; |
1294 | int ret; | |
1295 | ||
1296 | ret = seq_open(file, &trace_format_seq_ops); | |
1297 | if (ret < 0) | |
1298 | return ret; | |
1299 | ||
1300 | m = file->private_data; | |
c5a44a12 | 1301 | m->private = file; |
2a37a3df SR |
1302 | |
1303 | return 0; | |
981d081e SR |
1304 | } |
1305 | ||
23725aee PZ |
1306 | static ssize_t |
1307 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1308 | { | |
1a11126b | 1309 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1310 | char buf[32]; |
1311 | int len; | |
23725aee PZ |
1312 | |
1313 | if (*ppos) | |
1314 | return 0; | |
1315 | ||
1a11126b ON |
1316 | if (unlikely(!id)) |
1317 | return -ENODEV; | |
1318 | ||
1319 | len = sprintf(buf, "%d\n", id); | |
1320 | ||
cd458ba9 | 1321 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1322 | } |
1323 | ||
7ce7e424 TZ |
1324 | static ssize_t |
1325 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1326 | loff_t *ppos) | |
1327 | { | |
7f1d2f82 | 1328 | struct trace_event_file *file; |
7ce7e424 | 1329 | struct trace_seq *s; |
e2912b09 | 1330 | int r = -ENODEV; |
7ce7e424 TZ |
1331 | |
1332 | if (*ppos) | |
1333 | return 0; | |
1334 | ||
1335 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1336 | |
7ce7e424 TZ |
1337 | if (!s) |
1338 | return -ENOMEM; | |
1339 | ||
1340 | trace_seq_init(s); | |
1341 | ||
e2912b09 | 1342 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1343 | file = event_file_data(filp); |
1344 | if (file) | |
1345 | print_event_filter(file, s); | |
e2912b09 ON |
1346 | mutex_unlock(&event_mutex); |
1347 | ||
f306cc82 | 1348 | if (file) |
5ac48378 SRRH |
1349 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1350 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1351 | |
1352 | kfree(s); | |
1353 | ||
1354 | return r; | |
1355 | } | |
1356 | ||
1357 | static ssize_t | |
1358 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1359 | loff_t *ppos) | |
1360 | { | |
7f1d2f82 | 1361 | struct trace_event_file *file; |
8b372562 | 1362 | char *buf; |
e2912b09 | 1363 | int err = -ENODEV; |
7ce7e424 | 1364 | |
8b372562 | 1365 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1366 | return -EINVAL; |
1367 | ||
70f6cbb6 AV |
1368 | buf = memdup_user_nul(ubuf, cnt); |
1369 | if (IS_ERR(buf)) | |
1370 | return PTR_ERR(buf); | |
7ce7e424 | 1371 | |
e2912b09 | 1372 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1373 | file = event_file_data(filp); |
1374 | if (file) | |
1375 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1376 | mutex_unlock(&event_mutex); |
1377 | ||
70f6cbb6 | 1378 | kfree(buf); |
8b372562 | 1379 | if (err < 0) |
44e9c8b7 | 1380 | return err; |
0a19e53c | 1381 | |
7ce7e424 TZ |
1382 | *ppos += cnt; |
1383 | ||
1384 | return cnt; | |
1385 | } | |
1386 | ||
e9dbfae5 SR |
1387 | static LIST_HEAD(event_subsystems); |
1388 | ||
1389 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1390 | { | |
1391 | struct event_subsystem *system = NULL; | |
7967b3e0 | 1392 | struct trace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
ae63b31e | 1393 | struct trace_array *tr; |
e9dbfae5 SR |
1394 | int ret; |
1395 | ||
d6d3523c GB |
1396 | if (tracing_is_disabled()) |
1397 | return -ENODEV; | |
1398 | ||
e9dbfae5 | 1399 | /* Make sure the system still exists */ |
a8227415 | 1400 | mutex_lock(&trace_types_lock); |
e9dbfae5 | 1401 | mutex_lock(&event_mutex); |
ae63b31e SR |
1402 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1403 | list_for_each_entry(dir, &tr->systems, list) { | |
1404 | if (dir == inode->i_private) { | |
1405 | /* Don't open systems with no events */ | |
1406 | if (dir->nr_events) { | |
1407 | __get_system_dir(dir); | |
1408 | system = dir->subsystem; | |
1409 | } | |
1410 | goto exit_loop; | |
e9dbfae5 | 1411 | } |
e9dbfae5 SR |
1412 | } |
1413 | } | |
ae63b31e | 1414 | exit_loop: |
e9dbfae5 | 1415 | mutex_unlock(&event_mutex); |
a8227415 | 1416 | mutex_unlock(&trace_types_lock); |
e9dbfae5 | 1417 | |
ae63b31e | 1418 | if (!system) |
e9dbfae5 SR |
1419 | return -ENODEV; |
1420 | ||
ae63b31e SR |
1421 | /* Some versions of gcc think dir can be uninitialized here */ |
1422 | WARN_ON(!dir); | |
1423 | ||
8e2e2fa4 SRRH |
1424 | /* Still need to increment the ref count of the system */ |
1425 | if (trace_array_get(tr) < 0) { | |
1426 | put_system(dir); | |
1427 | return -ENODEV; | |
1428 | } | |
1429 | ||
e9dbfae5 | 1430 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1431 | if (ret < 0) { |
1432 | trace_array_put(tr); | |
ae63b31e | 1433 | put_system(dir); |
8e2e2fa4 | 1434 | } |
ae63b31e SR |
1435 | |
1436 | return ret; | |
1437 | } | |
1438 | ||
1439 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1440 | { | |
7967b3e0 | 1441 | struct trace_subsystem_dir *dir; |
ae63b31e SR |
1442 | struct trace_array *tr = inode->i_private; |
1443 | int ret; | |
1444 | ||
d6d3523c GB |
1445 | if (tracing_is_disabled()) |
1446 | return -ENODEV; | |
1447 | ||
8e2e2fa4 SRRH |
1448 | if (trace_array_get(tr) < 0) |
1449 | return -ENODEV; | |
1450 | ||
ae63b31e SR |
1451 | /* Make a temporary dir that has no system but points to tr */ |
1452 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
8e2e2fa4 SRRH |
1453 | if (!dir) { |
1454 | trace_array_put(tr); | |
ae63b31e | 1455 | return -ENOMEM; |
8e2e2fa4 | 1456 | } |
ae63b31e SR |
1457 | |
1458 | dir->tr = tr; | |
1459 | ||
1460 | ret = tracing_open_generic(inode, filp); | |
8e2e2fa4 SRRH |
1461 | if (ret < 0) { |
1462 | trace_array_put(tr); | |
ae63b31e | 1463 | kfree(dir); |
d6d3523c | 1464 | return ret; |
8e2e2fa4 | 1465 | } |
ae63b31e SR |
1466 | |
1467 | filp->private_data = dir; | |
e9dbfae5 | 1468 | |
d6d3523c | 1469 | return 0; |
e9dbfae5 SR |
1470 | } |
1471 | ||
1472 | static int subsystem_release(struct inode *inode, struct file *file) | |
1473 | { | |
7967b3e0 | 1474 | struct trace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1475 | |
8e2e2fa4 SRRH |
1476 | trace_array_put(dir->tr); |
1477 | ||
ae63b31e SR |
1478 | /* |
1479 | * If dir->subsystem is NULL, then this is a temporary | |
1480 | * descriptor that was made for a trace_array to enable | |
1481 | * all subsystems. | |
1482 | */ | |
1483 | if (dir->subsystem) | |
1484 | put_system(dir); | |
1485 | else | |
1486 | kfree(dir); | |
e9dbfae5 SR |
1487 | |
1488 | return 0; | |
1489 | } | |
1490 | ||
cfb180f3 TZ |
1491 | static ssize_t |
1492 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1493 | loff_t *ppos) | |
1494 | { | |
7967b3e0 | 1495 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1496 | struct event_subsystem *system = dir->subsystem; |
cfb180f3 TZ |
1497 | struct trace_seq *s; |
1498 | int r; | |
1499 | ||
1500 | if (*ppos) | |
1501 | return 0; | |
1502 | ||
1503 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1504 | if (!s) | |
1505 | return -ENOMEM; | |
1506 | ||
1507 | trace_seq_init(s); | |
1508 | ||
8b372562 | 1509 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1510 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1511 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1512 | |
1513 | kfree(s); | |
1514 | ||
1515 | return r; | |
1516 | } | |
1517 | ||
1518 | static ssize_t | |
1519 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1520 | loff_t *ppos) | |
1521 | { | |
7967b3e0 | 1522 | struct trace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1523 | char *buf; |
cfb180f3 TZ |
1524 | int err; |
1525 | ||
8b372562 | 1526 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1527 | return -EINVAL; |
1528 | ||
70f6cbb6 AV |
1529 | buf = memdup_user_nul(ubuf, cnt); |
1530 | if (IS_ERR(buf)) | |
1531 | return PTR_ERR(buf); | |
cfb180f3 | 1532 | |
ae63b31e | 1533 | err = apply_subsystem_event_filter(dir, buf); |
70f6cbb6 | 1534 | kfree(buf); |
8b372562 | 1535 | if (err < 0) |
44e9c8b7 | 1536 | return err; |
cfb180f3 TZ |
1537 | |
1538 | *ppos += cnt; | |
1539 | ||
1540 | return cnt; | |
1541 | } | |
1542 | ||
d1b182a8 SR |
1543 | static ssize_t |
1544 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1545 | { | |
1546 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1547 | struct trace_seq *s; | |
1548 | int r; | |
1549 | ||
1550 | if (*ppos) | |
1551 | return 0; | |
1552 | ||
1553 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1554 | if (!s) | |
1555 | return -ENOMEM; | |
1556 | ||
1557 | trace_seq_init(s); | |
1558 | ||
1559 | func(s); | |
5ac48378 SRRH |
1560 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1561 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1562 | |
1563 | kfree(s); | |
1564 | ||
1565 | return r; | |
1566 | } | |
1567 | ||
8ca532ad SRRH |
1568 | static void ignore_task_cpu(void *data) |
1569 | { | |
1570 | struct trace_array *tr = data; | |
1571 | struct trace_pid_list *pid_list; | |
1572 | ||
1573 | /* | |
1574 | * This function is called by on_each_cpu() while the | |
1575 | * event_mutex is held. | |
1576 | */ | |
1577 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
1578 | mutex_is_locked(&event_mutex)); | |
1579 | ||
1580 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 1581 | trace_ignore_this_task(pid_list, current)); |
8ca532ad SRRH |
1582 | } |
1583 | ||
49090107 | 1584 | static ssize_t |
3fdaf80f | 1585 | ftrace_event_pid_write(struct file *filp, const char __user *ubuf, |
49090107 SRRH |
1586 | size_t cnt, loff_t *ppos) |
1587 | { | |
3fdaf80f | 1588 | struct seq_file *m = filp->private_data; |
49090107 SRRH |
1589 | struct trace_array *tr = m->private; |
1590 | struct trace_pid_list *filtered_pids = NULL; | |
f4d34a87 | 1591 | struct trace_pid_list *pid_list; |
3fdaf80f | 1592 | struct trace_event_file *file; |
76c813e2 | 1593 | ssize_t ret; |
49090107 SRRH |
1594 | |
1595 | if (!cnt) | |
1596 | return 0; | |
1597 | ||
1598 | ret = tracing_update_buffers(); | |
1599 | if (ret < 0) | |
1600 | return ret; | |
1601 | ||
49090107 | 1602 | mutex_lock(&event_mutex); |
76c813e2 | 1603 | |
f4d34a87 SR |
1604 | filtered_pids = rcu_dereference_protected(tr->filtered_pids, |
1605 | lockdep_is_held(&event_mutex)); | |
1606 | ||
76c813e2 SRRH |
1607 | ret = trace_pid_write(filtered_pids, &pid_list, ubuf, cnt); |
1608 | if (ret < 0) | |
f4d34a87 | 1609 | goto out; |
49090107 | 1610 | |
49090107 SRRH |
1611 | rcu_assign_pointer(tr->filtered_pids, pid_list); |
1612 | ||
3fdaf80f SRRH |
1613 | list_for_each_entry(file, &tr->events, list) { |
1614 | set_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
1615 | } | |
49090107 SRRH |
1616 | |
1617 | if (filtered_pids) { | |
1618 | synchronize_sched(); | |
76c813e2 SRRH |
1619 | trace_free_pid_list(filtered_pids); |
1620 | } else if (pid_list) { | |
3fdaf80f SRRH |
1621 | /* |
1622 | * Register a probe that is called before all other probes | |
1623 | * to set ignore_pid if next or prev do not match. | |
1624 | * Register a probe this is called after all other probes | |
1625 | * to only keep ignore_pid set if next pid matches. | |
1626 | */ | |
1627 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_pre, | |
1628 | tr, INT_MAX); | |
1629 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_post, | |
1630 | tr, 0); | |
1631 | ||
1632 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, | |
1633 | tr, INT_MAX); | |
1634 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, | |
1635 | tr, 0); | |
0f72e37e SRRH |
1636 | |
1637 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, | |
1638 | tr, INT_MAX); | |
1639 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, | |
1640 | tr, 0); | |
1641 | ||
1642 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_pre, | |
1643 | tr, INT_MAX); | |
1644 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_post, | |
1645 | tr, 0); | |
49090107 SRRH |
1646 | } |
1647 | ||
799fd44c SRRH |
1648 | /* |
1649 | * Ignoring of pids is done at task switch. But we have to | |
1650 | * check for those tasks that are currently running. | |
1651 | * Always do this in case a pid was appended or removed. | |
1652 | */ | |
1653 | on_each_cpu(ignore_task_cpu, tr, 1); | |
1654 | ||
f4d34a87 | 1655 | out: |
3fdaf80f SRRH |
1656 | mutex_unlock(&event_mutex); |
1657 | ||
76c813e2 SRRH |
1658 | if (ret > 0) |
1659 | *ppos += ret; | |
49090107 SRRH |
1660 | |
1661 | return ret; | |
1662 | } | |
1663 | ||
15075cac SR |
1664 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1665 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
49090107 | 1666 | static int ftrace_event_set_pid_open(struct inode *inode, struct file *file); |
f77d09a3 | 1667 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1668 | |
b77e38aa SR |
1669 | static const struct seq_operations show_event_seq_ops = { |
1670 | .start = t_start, | |
1671 | .next = t_next, | |
1672 | .show = t_show, | |
1673 | .stop = t_stop, | |
1674 | }; | |
1675 | ||
1676 | static const struct seq_operations show_set_event_seq_ops = { | |
1677 | .start = s_start, | |
1678 | .next = s_next, | |
1679 | .show = t_show, | |
1680 | .stop = t_stop, | |
1681 | }; | |
1682 | ||
49090107 SRRH |
1683 | static const struct seq_operations show_set_pid_seq_ops = { |
1684 | .start = p_start, | |
1685 | .next = p_next, | |
5cc8976b | 1686 | .show = trace_pid_show, |
49090107 SRRH |
1687 | .stop = p_stop, |
1688 | }; | |
1689 | ||
2314c4ae | 1690 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1691 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1692 | .read = seq_read, |
1693 | .llseek = seq_lseek, | |
1694 | .release = seq_release, | |
1695 | }; | |
1696 | ||
b77e38aa | 1697 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1698 | .open = ftrace_event_set_open, |
b77e38aa SR |
1699 | .read = seq_read, |
1700 | .write = ftrace_event_write, | |
1701 | .llseek = seq_lseek, | |
f77d09a3 | 1702 | .release = ftrace_event_release, |
b77e38aa SR |
1703 | }; |
1704 | ||
49090107 SRRH |
1705 | static const struct file_operations ftrace_set_event_pid_fops = { |
1706 | .open = ftrace_event_set_pid_open, | |
1707 | .read = seq_read, | |
1708 | .write = ftrace_event_pid_write, | |
1709 | .llseek = seq_lseek, | |
1710 | .release = ftrace_event_release, | |
1711 | }; | |
1712 | ||
1473e441 | 1713 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 1714 | .open = tracing_open_generic, |
1473e441 SR |
1715 | .read = event_enable_read, |
1716 | .write = event_enable_write, | |
6038f373 | 1717 | .llseek = default_llseek, |
1473e441 SR |
1718 | }; |
1719 | ||
981d081e | 1720 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1721 | .open = trace_format_open, |
1722 | .read = seq_read, | |
1723 | .llseek = seq_lseek, | |
1724 | .release = seq_release, | |
981d081e SR |
1725 | }; |
1726 | ||
23725aee | 1727 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1728 | .read = event_id_read, |
6038f373 | 1729 | .llseek = default_llseek, |
23725aee PZ |
1730 | }; |
1731 | ||
7ce7e424 TZ |
1732 | static const struct file_operations ftrace_event_filter_fops = { |
1733 | .open = tracing_open_generic, | |
1734 | .read = event_filter_read, | |
1735 | .write = event_filter_write, | |
6038f373 | 1736 | .llseek = default_llseek, |
7ce7e424 TZ |
1737 | }; |
1738 | ||
cfb180f3 | 1739 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1740 | .open = subsystem_open, |
cfb180f3 TZ |
1741 | .read = subsystem_filter_read, |
1742 | .write = subsystem_filter_write, | |
6038f373 | 1743 | .llseek = default_llseek, |
e9dbfae5 | 1744 | .release = subsystem_release, |
cfb180f3 TZ |
1745 | }; |
1746 | ||
8ae79a13 | 1747 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1748 | .open = subsystem_open, |
8ae79a13 SR |
1749 | .read = system_enable_read, |
1750 | .write = system_enable_write, | |
6038f373 | 1751 | .llseek = default_llseek, |
40ee4dff | 1752 | .release = subsystem_release, |
8ae79a13 SR |
1753 | }; |
1754 | ||
ae63b31e SR |
1755 | static const struct file_operations ftrace_tr_enable_fops = { |
1756 | .open = system_tr_open, | |
1757 | .read = system_enable_read, | |
1758 | .write = system_enable_write, | |
1759 | .llseek = default_llseek, | |
1760 | .release = subsystem_release, | |
1761 | }; | |
1762 | ||
d1b182a8 SR |
1763 | static const struct file_operations ftrace_show_header_fops = { |
1764 | .open = tracing_open_generic, | |
1765 | .read = show_header, | |
6038f373 | 1766 | .llseek = default_llseek, |
d1b182a8 SR |
1767 | }; |
1768 | ||
ae63b31e SR |
1769 | static int |
1770 | ftrace_event_open(struct inode *inode, struct file *file, | |
1771 | const struct seq_operations *seq_ops) | |
1473e441 | 1772 | { |
ae63b31e SR |
1773 | struct seq_file *m; |
1774 | int ret; | |
1473e441 | 1775 | |
ae63b31e SR |
1776 | ret = seq_open(file, seq_ops); |
1777 | if (ret < 0) | |
1778 | return ret; | |
1779 | m = file->private_data; | |
1780 | /* copy tr over to seq ops */ | |
1781 | m->private = inode->i_private; | |
1473e441 | 1782 | |
ae63b31e | 1783 | return ret; |
1473e441 SR |
1784 | } |
1785 | ||
f77d09a3 AL |
1786 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1787 | { | |
1788 | struct trace_array *tr = inode->i_private; | |
1789 | ||
1790 | trace_array_put(tr); | |
1791 | ||
1792 | return seq_release(inode, file); | |
1793 | } | |
1794 | ||
15075cac SR |
1795 | static int |
1796 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1797 | { | |
1798 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1799 | ||
ae63b31e | 1800 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1801 | } |
1802 | ||
1803 | static int | |
1804 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1805 | { | |
1806 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1807 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
1808 | int ret; |
1809 | ||
1810 | if (trace_array_get(tr) < 0) | |
1811 | return -ENODEV; | |
15075cac SR |
1812 | |
1813 | if ((file->f_mode & FMODE_WRITE) && | |
1814 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1815 | ftrace_clear_events(tr); |
15075cac | 1816 | |
f77d09a3 AL |
1817 | ret = ftrace_event_open(inode, file, seq_ops); |
1818 | if (ret < 0) | |
1819 | trace_array_put(tr); | |
1820 | return ret; | |
ae63b31e SR |
1821 | } |
1822 | ||
49090107 SRRH |
1823 | static int |
1824 | ftrace_event_set_pid_open(struct inode *inode, struct file *file) | |
1825 | { | |
1826 | const struct seq_operations *seq_ops = &show_set_pid_seq_ops; | |
1827 | struct trace_array *tr = inode->i_private; | |
1828 | int ret; | |
1829 | ||
1830 | if (trace_array_get(tr) < 0) | |
1831 | return -ENODEV; | |
1832 | ||
1833 | if ((file->f_mode & FMODE_WRITE) && | |
1834 | (file->f_flags & O_TRUNC)) | |
1835 | ftrace_clear_event_pids(tr); | |
1836 | ||
1837 | ret = ftrace_event_open(inode, file, seq_ops); | |
1838 | if (ret < 0) | |
1839 | trace_array_put(tr); | |
1840 | return ret; | |
1841 | } | |
1842 | ||
ae63b31e SR |
1843 | static struct event_subsystem * |
1844 | create_new_subsystem(const char *name) | |
1845 | { | |
1846 | struct event_subsystem *system; | |
1847 | ||
1848 | /* need to create new entry */ | |
1849 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1850 | if (!system) | |
1851 | return NULL; | |
1852 | ||
1853 | system->ref_count = 1; | |
6e94a780 SR |
1854 | |
1855 | /* Only allocate if dynamic (kprobes and modules) */ | |
79ac6ef5 RV |
1856 | system->name = kstrdup_const(name, GFP_KERNEL); |
1857 | if (!system->name) | |
1858 | goto out_free; | |
ae63b31e SR |
1859 | |
1860 | system->filter = NULL; | |
1861 | ||
1862 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1863 | if (!system->filter) | |
1864 | goto out_free; | |
1865 | ||
1866 | list_add(&system->list, &event_subsystems); | |
1867 | ||
1868 | return system; | |
1869 | ||
1870 | out_free: | |
79ac6ef5 | 1871 | kfree_const(system->name); |
ae63b31e SR |
1872 | kfree(system); |
1873 | return NULL; | |
15075cac SR |
1874 | } |
1875 | ||
6ecc2d1c | 1876 | static struct dentry * |
ae63b31e | 1877 | event_subsystem_dir(struct trace_array *tr, const char *name, |
7f1d2f82 | 1878 | struct trace_event_file *file, struct dentry *parent) |
6ecc2d1c | 1879 | { |
7967b3e0 | 1880 | struct trace_subsystem_dir *dir; |
6ecc2d1c | 1881 | struct event_subsystem *system; |
e1112b4d | 1882 | struct dentry *entry; |
6ecc2d1c SR |
1883 | |
1884 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1885 | list_for_each_entry(dir, &tr->systems, list) { |
1886 | system = dir->subsystem; | |
dc82ec98 | 1887 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1888 | dir->nr_events++; |
1889 | file->system = dir; | |
1890 | return dir->entry; | |
dc82ec98 | 1891 | } |
6ecc2d1c SR |
1892 | } |
1893 | ||
ae63b31e SR |
1894 | /* Now see if the system itself exists. */ |
1895 | list_for_each_entry(system, &event_subsystems, list) { | |
1896 | if (strcmp(system->name, name) == 0) | |
1897 | break; | |
6ecc2d1c | 1898 | } |
ae63b31e SR |
1899 | /* Reset system variable when not found */ |
1900 | if (&system->list == &event_subsystems) | |
1901 | system = NULL; | |
6ecc2d1c | 1902 | |
ae63b31e SR |
1903 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1904 | if (!dir) | |
1905 | goto out_fail; | |
6ecc2d1c | 1906 | |
ae63b31e SR |
1907 | if (!system) { |
1908 | system = create_new_subsystem(name); | |
1909 | if (!system) | |
1910 | goto out_free; | |
1911 | } else | |
1912 | __get_system(system); | |
1913 | ||
8434dc93 | 1914 | dir->entry = tracefs_create_dir(name, parent); |
ae63b31e | 1915 | if (!dir->entry) { |
3448bac3 | 1916 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
1917 | __put_system(system); |
1918 | goto out_free; | |
6d723736 SR |
1919 | } |
1920 | ||
ae63b31e SR |
1921 | dir->tr = tr; |
1922 | dir->ref_count = 1; | |
1923 | dir->nr_events = 1; | |
1924 | dir->subsystem = system; | |
1925 | file->system = dir; | |
8b372562 | 1926 | |
8434dc93 | 1927 | entry = tracefs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1928 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1929 | if (!entry) { |
1930 | kfree(system->filter); | |
1931 | system->filter = NULL; | |
8434dc93 | 1932 | pr_warn("Could not create tracefs '%s/filter' entry\n", name); |
8b372562 | 1933 | } |
e1112b4d | 1934 | |
ae63b31e | 1935 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1936 | &ftrace_system_enable_fops); |
8ae79a13 | 1937 | |
ae63b31e SR |
1938 | list_add(&dir->list, &tr->systems); |
1939 | ||
1940 | return dir->entry; | |
1941 | ||
1942 | out_free: | |
1943 | kfree(dir); | |
1944 | out_fail: | |
1945 | /* Only print this message if failed on memory allocation */ | |
1946 | if (!dir || !system) | |
3448bac3 | 1947 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 1948 | return NULL; |
6ecc2d1c SR |
1949 | } |
1950 | ||
1473e441 | 1951 | static int |
7f1d2f82 | 1952 | event_create_dir(struct dentry *parent, struct trace_event_file *file) |
1473e441 | 1953 | { |
2425bcb9 | 1954 | struct trace_event_call *call = file->event_call; |
ae63b31e | 1955 | struct trace_array *tr = file->tr; |
2e33af02 | 1956 | struct list_head *head; |
ae63b31e | 1957 | struct dentry *d_events; |
de7b2973 | 1958 | const char *name; |
fd994989 | 1959 | int ret; |
1473e441 | 1960 | |
6ecc2d1c SR |
1961 | /* |
1962 | * If the trace point header did not define TRACE_SYSTEM | |
1963 | * then the system would be called "TRACE_SYSTEM". | |
1964 | */ | |
ae63b31e SR |
1965 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1966 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1967 | if (!d_events) | |
1968 | return -ENOMEM; | |
1969 | } else | |
1970 | d_events = parent; | |
1971 | ||
687fcc4a | 1972 | name = trace_event_name(call); |
8434dc93 | 1973 | file->dir = tracefs_create_dir(name, d_events); |
ae63b31e | 1974 | if (!file->dir) { |
8434dc93 | 1975 | pr_warn("Could not create tracefs '%s' directory\n", name); |
1473e441 SR |
1976 | return -1; |
1977 | } | |
1978 | ||
9b63776f | 1979 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1980 | trace_create_file("enable", 0644, file->dir, file, |
620a30e9 | 1981 | &ftrace_enable_fops); |
1473e441 | 1982 | |
2239291a | 1983 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1984 | if (call->event.type && call->class->reg) |
1a11126b | 1985 | trace_create_file("id", 0444, file->dir, |
620a30e9 ON |
1986 | (void *)(long)call->event.type, |
1987 | &ftrace_event_id_fops); | |
2239291a | 1988 | #endif |
23725aee | 1989 | |
c9d932cf LZ |
1990 | /* |
1991 | * Other events may have the same class. Only update | |
1992 | * the fields if they are not already defined. | |
1993 | */ | |
1994 | head = trace_get_fields(call); | |
1995 | if (list_empty(head)) { | |
1996 | ret = call->class->define_fields(call); | |
1997 | if (ret < 0) { | |
3448bac3 FF |
1998 | pr_warn("Could not initialize trace point events/%s\n", |
1999 | name); | |
ae63b31e | 2000 | return -1; |
cf027f64 TZ |
2001 | } |
2002 | } | |
f306cc82 | 2003 | trace_create_file("filter", 0644, file->dir, file, |
620a30e9 | 2004 | &ftrace_event_filter_fops); |
cf027f64 | 2005 | |
854145e0 CH |
2006 | /* |
2007 | * Only event directories that can be enabled should have | |
2008 | * triggers. | |
2009 | */ | |
2010 | if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
2011 | trace_create_file("trigger", 0644, file->dir, file, | |
2012 | &event_trigger_fops); | |
85f2b082 | 2013 | |
7ef224d1 TZ |
2014 | #ifdef CONFIG_HIST_TRIGGERS |
2015 | trace_create_file("hist", 0444, file->dir, file, | |
2016 | &event_hist_fops); | |
2017 | #endif | |
ae63b31e | 2018 | trace_create_file("format", 0444, file->dir, call, |
620a30e9 | 2019 | &ftrace_event_format_fops); |
6d723736 SR |
2020 | |
2021 | return 0; | |
2022 | } | |
2023 | ||
2425bcb9 | 2024 | static void remove_event_from_tracers(struct trace_event_call *call) |
ae63b31e | 2025 | { |
7f1d2f82 | 2026 | struct trace_event_file *file; |
ae63b31e SR |
2027 | struct trace_array *tr; |
2028 | ||
2029 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
2030 | if (file->event_call != call) |
2031 | continue; | |
2032 | ||
f6a84bdc | 2033 | remove_event_file_dir(file); |
ae63b31e SR |
2034 | /* |
2035 | * The do_for_each_event_file_safe() is | |
2036 | * a double loop. After finding the call for this | |
2037 | * trace_array, we use break to jump to the next | |
2038 | * trace_array. | |
2039 | */ | |
2040 | break; | |
2041 | } while_for_each_event_file(); | |
2042 | } | |
2043 | ||
2425bcb9 | 2044 | static void event_remove(struct trace_event_call *call) |
8781915a | 2045 | { |
ae63b31e | 2046 | struct trace_array *tr; |
7f1d2f82 | 2047 | struct trace_event_file *file; |
ae63b31e SR |
2048 | |
2049 | do_for_each_event_file(tr, file) { | |
2050 | if (file->event_call != call) | |
2051 | continue; | |
2052 | ftrace_event_enable_disable(file, 0); | |
2053 | /* | |
2054 | * The do_for_each_event_file() is | |
2055 | * a double loop. After finding the call for this | |
2056 | * trace_array, we use break to jump to the next | |
2057 | * trace_array. | |
2058 | */ | |
2059 | break; | |
2060 | } while_for_each_event_file(); | |
2061 | ||
8781915a | 2062 | if (call->event.funcs) |
9023c930 | 2063 | __unregister_trace_event(&call->event); |
ae63b31e | 2064 | remove_event_from_tracers(call); |
8781915a EG |
2065 | list_del(&call->list); |
2066 | } | |
2067 | ||
2425bcb9 | 2068 | static int event_init(struct trace_event_call *call) |
8781915a EG |
2069 | { |
2070 | int ret = 0; | |
de7b2973 | 2071 | const char *name; |
8781915a | 2072 | |
687fcc4a | 2073 | name = trace_event_name(call); |
de7b2973 | 2074 | if (WARN_ON(!name)) |
8781915a EG |
2075 | return -EINVAL; |
2076 | ||
2077 | if (call->class->raw_init) { | |
2078 | ret = call->class->raw_init(call); | |
2079 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 2080 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
2081 | } |
2082 | ||
2083 | return ret; | |
2084 | } | |
2085 | ||
67ead0a6 | 2086 | static int |
2425bcb9 | 2087 | __register_event(struct trace_event_call *call, struct module *mod) |
bd1a5c84 | 2088 | { |
bd1a5c84 | 2089 | int ret; |
6d723736 | 2090 | |
8781915a EG |
2091 | ret = event_init(call); |
2092 | if (ret < 0) | |
2093 | return ret; | |
701970b3 | 2094 | |
ae63b31e | 2095 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 2096 | call->mod = mod; |
88f70d75 | 2097 | |
ae63b31e | 2098 | return 0; |
bd1a5c84 MH |
2099 | } |
2100 | ||
0c564a53 SRRH |
2101 | static char *enum_replace(char *ptr, struct trace_enum_map *map, int len) |
2102 | { | |
2103 | int rlen; | |
2104 | int elen; | |
2105 | ||
2106 | /* Find the length of the enum value as a string */ | |
2107 | elen = snprintf(ptr, 0, "%ld", map->enum_value); | |
2108 | /* Make sure there's enough room to replace the string with the value */ | |
2109 | if (len < elen) | |
2110 | return NULL; | |
2111 | ||
2112 | snprintf(ptr, elen + 1, "%ld", map->enum_value); | |
2113 | ||
2114 | /* Get the rest of the string of ptr */ | |
2115 | rlen = strlen(ptr + len); | |
2116 | memmove(ptr + elen, ptr + len, rlen); | |
2117 | /* Make sure we end the new string */ | |
2118 | ptr[elen + rlen] = 0; | |
2119 | ||
2120 | return ptr + elen; | |
2121 | } | |
2122 | ||
2425bcb9 | 2123 | static void update_event_printk(struct trace_event_call *call, |
0c564a53 SRRH |
2124 | struct trace_enum_map *map) |
2125 | { | |
2126 | char *ptr; | |
2127 | int quote = 0; | |
2128 | int len = strlen(map->enum_string); | |
2129 | ||
2130 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
2131 | if (*ptr == '\\') { | |
2132 | ptr++; | |
2133 | /* paranoid */ | |
2134 | if (!*ptr) | |
2135 | break; | |
2136 | continue; | |
2137 | } | |
2138 | if (*ptr == '"') { | |
2139 | quote ^= 1; | |
2140 | continue; | |
2141 | } | |
2142 | if (quote) | |
2143 | continue; | |
2144 | if (isdigit(*ptr)) { | |
2145 | /* skip numbers */ | |
2146 | do { | |
2147 | ptr++; | |
2148 | /* Check for alpha chars like ULL */ | |
2149 | } while (isalnum(*ptr)); | |
3193899d SRRH |
2150 | if (!*ptr) |
2151 | break; | |
0c564a53 SRRH |
2152 | /* |
2153 | * A number must have some kind of delimiter after | |
2154 | * it, and we can ignore that too. | |
2155 | */ | |
2156 | continue; | |
2157 | } | |
2158 | if (isalpha(*ptr) || *ptr == '_') { | |
2159 | if (strncmp(map->enum_string, ptr, len) == 0 && | |
2160 | !isalnum(ptr[len]) && ptr[len] != '_') { | |
2161 | ptr = enum_replace(ptr, map, len); | |
2162 | /* Hmm, enum string smaller than value */ | |
2163 | if (WARN_ON_ONCE(!ptr)) | |
2164 | return; | |
2165 | /* | |
2166 | * No need to decrement here, as enum_replace() | |
2167 | * returns the pointer to the character passed | |
2168 | * the enum, and two enums can not be placed | |
2169 | * back to back without something in between. | |
2170 | * We can skip that something in between. | |
2171 | */ | |
2172 | continue; | |
2173 | } | |
2174 | skip_more: | |
2175 | do { | |
2176 | ptr++; | |
2177 | } while (isalnum(*ptr) || *ptr == '_'); | |
3193899d SRRH |
2178 | if (!*ptr) |
2179 | break; | |
0c564a53 SRRH |
2180 | /* |
2181 | * If what comes after this variable is a '.' or | |
2182 | * '->' then we can continue to ignore that string. | |
2183 | */ | |
2184 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
2185 | ptr += *ptr == '.' ? 1 : 2; | |
3193899d SRRH |
2186 | if (!*ptr) |
2187 | break; | |
0c564a53 SRRH |
2188 | goto skip_more; |
2189 | } | |
2190 | /* | |
2191 | * Once again, we can skip the delimiter that came | |
2192 | * after the string. | |
2193 | */ | |
2194 | continue; | |
2195 | } | |
2196 | } | |
2197 | } | |
2198 | ||
2199 | void trace_event_enum_update(struct trace_enum_map **map, int len) | |
2200 | { | |
2425bcb9 | 2201 | struct trace_event_call *call, *p; |
0c564a53 SRRH |
2202 | const char *last_system = NULL; |
2203 | int last_i; | |
2204 | int i; | |
2205 | ||
2206 | down_write(&trace_event_sem); | |
2207 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
2208 | /* events are usually grouped together with systems */ | |
2209 | if (!last_system || call->class->system != last_system) { | |
2210 | last_i = 0; | |
2211 | last_system = call->class->system; | |
2212 | } | |
2213 | ||
2214 | for (i = last_i; i < len; i++) { | |
2215 | if (call->class->system == map[i]->system) { | |
2216 | /* Save the first system if need be */ | |
2217 | if (!last_i) | |
2218 | last_i = i; | |
2219 | update_event_printk(call, map[i]); | |
2220 | } | |
2221 | } | |
2222 | } | |
2223 | up_write(&trace_event_sem); | |
2224 | } | |
2225 | ||
7f1d2f82 | 2226 | static struct trace_event_file * |
2425bcb9 | 2227 | trace_create_new_event(struct trace_event_call *call, |
da511bf3 SRRH |
2228 | struct trace_array *tr) |
2229 | { | |
7f1d2f82 | 2230 | struct trace_event_file *file; |
da511bf3 SRRH |
2231 | |
2232 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
2233 | if (!file) | |
2234 | return NULL; | |
2235 | ||
2236 | file->event_call = call; | |
2237 | file->tr = tr; | |
2238 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
2239 | atomic_set(&file->tm_ref, 0); |
2240 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
2241 | list_add(&file->list, &tr->events); |
2242 | ||
2243 | return file; | |
2244 | } | |
2245 | ||
ae63b31e SR |
2246 | /* Add an event to a trace directory */ |
2247 | static int | |
2425bcb9 | 2248 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) |
ae63b31e | 2249 | { |
7f1d2f82 | 2250 | struct trace_event_file *file; |
ae63b31e | 2251 | |
da511bf3 | 2252 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
2253 | if (!file) |
2254 | return -ENOMEM; | |
2255 | ||
620a30e9 | 2256 | return event_create_dir(tr->event_dir, file); |
ae63b31e SR |
2257 | } |
2258 | ||
77248221 SR |
2259 | /* |
2260 | * Just create a decriptor for early init. A descriptor is required | |
2261 | * for enabling events at boot. We want to enable events before | |
2262 | * the filesystem is initialized. | |
2263 | */ | |
2264 | static __init int | |
2425bcb9 | 2265 | __trace_early_add_new_event(struct trace_event_call *call, |
77248221 SR |
2266 | struct trace_array *tr) |
2267 | { | |
7f1d2f82 | 2268 | struct trace_event_file *file; |
77248221 | 2269 | |
da511bf3 | 2270 | file = trace_create_new_event(call, tr); |
77248221 SR |
2271 | if (!file) |
2272 | return -ENOMEM; | |
2273 | ||
77248221 SR |
2274 | return 0; |
2275 | } | |
2276 | ||
ae63b31e | 2277 | struct ftrace_module_file_ops; |
2425bcb9 | 2278 | static void __add_event_to_tracers(struct trace_event_call *call); |
ae63b31e | 2279 | |
bd1a5c84 | 2280 | /* Add an additional event_call dynamically */ |
2425bcb9 | 2281 | int trace_add_event_call(struct trace_event_call *call) |
bd1a5c84 MH |
2282 | { |
2283 | int ret; | |
a8227415 | 2284 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 2285 | mutex_lock(&event_mutex); |
701970b3 | 2286 | |
ae63b31e SR |
2287 | ret = __register_event(call, NULL); |
2288 | if (ret >= 0) | |
779c5e37 | 2289 | __add_event_to_tracers(call); |
a2ca5e03 | 2290 | |
ae63b31e | 2291 | mutex_unlock(&event_mutex); |
a8227415 | 2292 | mutex_unlock(&trace_types_lock); |
ae63b31e | 2293 | return ret; |
a2ca5e03 FW |
2294 | } |
2295 | ||
4fead8e4 | 2296 | /* |
a8227415 AL |
2297 | * Must be called under locking of trace_types_lock, event_mutex and |
2298 | * trace_event_sem. | |
4fead8e4 | 2299 | */ |
2425bcb9 | 2300 | static void __trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2301 | { |
8781915a | 2302 | event_remove(call); |
bd1a5c84 | 2303 | trace_destroy_fields(call); |
57375747 ON |
2304 | free_event_filter(call->filter); |
2305 | call->filter = NULL; | |
bd1a5c84 MH |
2306 | } |
2307 | ||
2425bcb9 | 2308 | static int probe_remove_event_call(struct trace_event_call *call) |
2816c551 ON |
2309 | { |
2310 | struct trace_array *tr; | |
7f1d2f82 | 2311 | struct trace_event_file *file; |
2816c551 ON |
2312 | |
2313 | #ifdef CONFIG_PERF_EVENTS | |
2314 | if (call->perf_refcount) | |
2315 | return -EBUSY; | |
2316 | #endif | |
2317 | do_for_each_event_file(tr, file) { | |
2318 | if (file->event_call != call) | |
2319 | continue; | |
2320 | /* | |
2321 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
5d6ad960 | 2322 | * we are going to do, EVENT_FILE_FL_SOFT_MODE can suppress |
2816c551 ON |
2323 | * TRACE_REG_UNREGISTER. |
2324 | */ | |
5d6ad960 | 2325 | if (file->flags & EVENT_FILE_FL_ENABLED) |
2816c551 | 2326 | return -EBUSY; |
2ba64035 SRRH |
2327 | /* |
2328 | * The do_for_each_event_file_safe() is | |
2329 | * a double loop. After finding the call for this | |
2330 | * trace_array, we use break to jump to the next | |
2331 | * trace_array. | |
2332 | */ | |
2816c551 ON |
2333 | break; |
2334 | } while_for_each_event_file(); | |
2335 | ||
2336 | __trace_remove_event_call(call); | |
2337 | ||
2338 | return 0; | |
2339 | } | |
2340 | ||
bd1a5c84 | 2341 | /* Remove an event_call */ |
2425bcb9 | 2342 | int trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2343 | { |
2816c551 ON |
2344 | int ret; |
2345 | ||
a8227415 | 2346 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 2347 | mutex_lock(&event_mutex); |
52f6ad6d | 2348 | down_write(&trace_event_sem); |
2816c551 | 2349 | ret = probe_remove_event_call(call); |
52f6ad6d | 2350 | up_write(&trace_event_sem); |
bd1a5c84 | 2351 | mutex_unlock(&event_mutex); |
a8227415 | 2352 | mutex_unlock(&trace_types_lock); |
2816c551 ON |
2353 | |
2354 | return ret; | |
bd1a5c84 MH |
2355 | } |
2356 | ||
2357 | #define for_each_event(event, start, end) \ | |
2358 | for (event = start; \ | |
2359 | (unsigned long)event < (unsigned long)end; \ | |
2360 | event++) | |
2361 | ||
2362 | #ifdef CONFIG_MODULES | |
2363 | ||
6d723736 SR |
2364 | static void trace_module_add_events(struct module *mod) |
2365 | { | |
2425bcb9 | 2366 | struct trace_event_call **call, **start, **end; |
6d723736 | 2367 | |
45ab2813 SRRH |
2368 | if (!mod->num_trace_events) |
2369 | return; | |
2370 | ||
2371 | /* Don't add infrastructure for mods without tracepoints */ | |
2372 | if (trace_module_has_bad_taint(mod)) { | |
2373 | pr_err("%s: module has bad taint, not creating trace events\n", | |
2374 | mod->name); | |
2375 | return; | |
2376 | } | |
2377 | ||
6d723736 SR |
2378 | start = mod->trace_events; |
2379 | end = mod->trace_events + mod->num_trace_events; | |
2380 | ||
6d723736 | 2381 | for_each_event(call, start, end) { |
ae63b31e | 2382 | __register_event(*call, mod); |
779c5e37 | 2383 | __add_event_to_tracers(*call); |
6d723736 SR |
2384 | } |
2385 | } | |
2386 | ||
2387 | static void trace_module_remove_events(struct module *mod) | |
2388 | { | |
2425bcb9 | 2389 | struct trace_event_call *call, *p; |
575380da | 2390 | bool clear_trace = false; |
6d723736 | 2391 | |
52f6ad6d | 2392 | down_write(&trace_event_sem); |
6d723736 SR |
2393 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
2394 | if (call->mod == mod) { | |
575380da SRRH |
2395 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
2396 | clear_trace = true; | |
bd1a5c84 | 2397 | __trace_remove_event_call(call); |
6d723736 SR |
2398 | } |
2399 | } | |
52f6ad6d | 2400 | up_write(&trace_event_sem); |
9456f0fa SR |
2401 | |
2402 | /* | |
2403 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
2404 | * registered any events that were used. The only worry is if |
2405 | * a new module gets loaded, and takes on the same id as the events | |
2406 | * of this module. When printing out the buffer, traced events left | |
2407 | * over from this module may be passed to the new module events and | |
2408 | * unexpected results may occur. | |
9456f0fa | 2409 | */ |
575380da | 2410 | if (clear_trace) |
873c642f | 2411 | tracing_reset_all_online_cpus(); |
6d723736 SR |
2412 | } |
2413 | ||
61f919a1 SR |
2414 | static int trace_module_notify(struct notifier_block *self, |
2415 | unsigned long val, void *data) | |
6d723736 SR |
2416 | { |
2417 | struct module *mod = data; | |
2418 | ||
a8227415 | 2419 | mutex_lock(&trace_types_lock); |
6d723736 SR |
2420 | mutex_lock(&event_mutex); |
2421 | switch (val) { | |
2422 | case MODULE_STATE_COMING: | |
2423 | trace_module_add_events(mod); | |
2424 | break; | |
2425 | case MODULE_STATE_GOING: | |
2426 | trace_module_remove_events(mod); | |
2427 | break; | |
2428 | } | |
2429 | mutex_unlock(&event_mutex); | |
a8227415 | 2430 | mutex_unlock(&trace_types_lock); |
fd994989 | 2431 | |
1473e441 SR |
2432 | return 0; |
2433 | } | |
315326c1 | 2434 | |
836d481e ON |
2435 | static struct notifier_block trace_module_nb = { |
2436 | .notifier_call = trace_module_notify, | |
3673b8e4 | 2437 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 2438 | }; |
61f919a1 | 2439 | #endif /* CONFIG_MODULES */ |
1473e441 | 2440 | |
ae63b31e SR |
2441 | /* Create a new event directory structure for a trace directory. */ |
2442 | static void | |
2443 | __trace_add_event_dirs(struct trace_array *tr) | |
2444 | { | |
2425bcb9 | 2445 | struct trace_event_call *call; |
ae63b31e SR |
2446 | int ret; |
2447 | ||
2448 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 2449 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 2450 | if (ret < 0) |
3448bac3 | 2451 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2452 | trace_event_name(call)); |
ae63b31e SR |
2453 | } |
2454 | } | |
2455 | ||
7f1d2f82 | 2456 | struct trace_event_file * |
3cd715de SRRH |
2457 | find_event_file(struct trace_array *tr, const char *system, const char *event) |
2458 | { | |
7f1d2f82 | 2459 | struct trace_event_file *file; |
2425bcb9 | 2460 | struct trace_event_call *call; |
de7b2973 | 2461 | const char *name; |
3cd715de SRRH |
2462 | |
2463 | list_for_each_entry(file, &tr->events, list) { | |
2464 | ||
2465 | call = file->event_call; | |
687fcc4a | 2466 | name = trace_event_name(call); |
3cd715de | 2467 | |
de7b2973 | 2468 | if (!name || !call->class || !call->class->reg) |
3cd715de SRRH |
2469 | continue; |
2470 | ||
2471 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2472 | continue; | |
2473 | ||
de7b2973 | 2474 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
2475 | strcmp(system, call->class->system) == 0) |
2476 | return file; | |
2477 | } | |
2478 | return NULL; | |
2479 | } | |
2480 | ||
2875a08b SRRH |
2481 | #ifdef CONFIG_DYNAMIC_FTRACE |
2482 | ||
2483 | /* Avoid typos */ | |
2484 | #define ENABLE_EVENT_STR "enable_event" | |
2485 | #define DISABLE_EVENT_STR "disable_event" | |
2486 | ||
2487 | struct event_probe_data { | |
7f1d2f82 | 2488 | struct trace_event_file *file; |
2875a08b SRRH |
2489 | unsigned long count; |
2490 | int ref; | |
2491 | bool enable; | |
2492 | }; | |
2493 | ||
3cd715de SRRH |
2494 | static void |
2495 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2496 | { | |
2497 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2498 | struct event_probe_data *data = *pdata; | |
2499 | ||
2500 | if (!data) | |
2501 | return; | |
2502 | ||
2503 | if (data->enable) | |
5d6ad960 | 2504 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
3cd715de | 2505 | else |
5d6ad960 | 2506 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
3cd715de SRRH |
2507 | } |
2508 | ||
2509 | static void | |
2510 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2511 | { | |
2512 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2513 | struct event_probe_data *data = *pdata; | |
2514 | ||
2515 | if (!data) | |
2516 | return; | |
2517 | ||
2518 | if (!data->count) | |
2519 | return; | |
2520 | ||
2521 | /* Skip if the event is in a state we want to switch to */ | |
5d6ad960 | 2522 | if (data->enable == !(data->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
3cd715de SRRH |
2523 | return; |
2524 | ||
2525 | if (data->count != -1) | |
2526 | (data->count)--; | |
2527 | ||
2528 | event_enable_probe(ip, parent_ip, _data); | |
2529 | } | |
2530 | ||
2531 | static int | |
2532 | event_enable_print(struct seq_file *m, unsigned long ip, | |
2533 | struct ftrace_probe_ops *ops, void *_data) | |
2534 | { | |
2535 | struct event_probe_data *data = _data; | |
2536 | ||
2537 | seq_printf(m, "%ps:", (void *)ip); | |
2538 | ||
2539 | seq_printf(m, "%s:%s:%s", | |
2540 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, | |
2541 | data->file->event_call->class->system, | |
687fcc4a | 2542 | trace_event_name(data->file->event_call)); |
3cd715de SRRH |
2543 | |
2544 | if (data->count == -1) | |
fa6f0cc7 | 2545 | seq_puts(m, ":unlimited\n"); |
3cd715de SRRH |
2546 | else |
2547 | seq_printf(m, ":count=%ld\n", data->count); | |
2548 | ||
2549 | return 0; | |
2550 | } | |
2551 | ||
2552 | static int | |
2553 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, | |
2554 | void **_data) | |
2555 | { | |
2556 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2557 | struct event_probe_data *data = *pdata; | |
2558 | ||
2559 | data->ref++; | |
2560 | return 0; | |
2561 | } | |
2562 | ||
2563 | static void | |
2564 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, | |
2565 | void **_data) | |
2566 | { | |
2567 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2568 | struct event_probe_data *data = *pdata; | |
2569 | ||
2570 | if (WARN_ON_ONCE(data->ref <= 0)) | |
2571 | return; | |
2572 | ||
2573 | data->ref--; | |
2574 | if (!data->ref) { | |
2575 | /* Remove the SOFT_MODE flag */ | |
2576 | __ftrace_event_enable_disable(data->file, 0, 1); | |
2577 | module_put(data->file->event_call->mod); | |
2578 | kfree(data); | |
2579 | } | |
2580 | *pdata = NULL; | |
2581 | } | |
2582 | ||
2583 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2584 | .func = event_enable_probe, | |
2585 | .print = event_enable_print, | |
2586 | .init = event_enable_init, | |
2587 | .free = event_enable_free, | |
2588 | }; | |
2589 | ||
2590 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
2591 | .func = event_enable_count_probe, | |
2592 | .print = event_enable_print, | |
2593 | .init = event_enable_init, | |
2594 | .free = event_enable_free, | |
2595 | }; | |
2596 | ||
2597 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
2598 | .func = event_enable_probe, | |
2599 | .print = event_enable_print, | |
2600 | .init = event_enable_init, | |
2601 | .free = event_enable_free, | |
2602 | }; | |
2603 | ||
2604 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2605 | .func = event_enable_count_probe, | |
2606 | .print = event_enable_print, | |
2607 | .init = event_enable_init, | |
2608 | .free = event_enable_free, | |
2609 | }; | |
2610 | ||
2611 | static int | |
2612 | event_enable_func(struct ftrace_hash *hash, | |
2613 | char *glob, char *cmd, char *param, int enabled) | |
2614 | { | |
2615 | struct trace_array *tr = top_trace_array(); | |
7f1d2f82 | 2616 | struct trace_event_file *file; |
3cd715de SRRH |
2617 | struct ftrace_probe_ops *ops; |
2618 | struct event_probe_data *data; | |
2619 | const char *system; | |
2620 | const char *event; | |
2621 | char *number; | |
2622 | bool enable; | |
2623 | int ret; | |
2624 | ||
dc81e5e3 YY |
2625 | if (!tr) |
2626 | return -ENODEV; | |
2627 | ||
3cd715de | 2628 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 2629 | if (!enabled || !param) |
3cd715de SRRH |
2630 | return -EINVAL; |
2631 | ||
2632 | system = strsep(¶m, ":"); | |
2633 | if (!param) | |
2634 | return -EINVAL; | |
2635 | ||
2636 | event = strsep(¶m, ":"); | |
2637 | ||
2638 | mutex_lock(&event_mutex); | |
2639 | ||
2640 | ret = -EINVAL; | |
2641 | file = find_event_file(tr, system, event); | |
2642 | if (!file) | |
2643 | goto out; | |
2644 | ||
2645 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2646 | ||
2647 | if (enable) | |
2648 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2649 | else | |
2650 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2651 | ||
2652 | if (glob[0] == '!') { | |
2653 | unregister_ftrace_function_probe_func(glob+1, ops); | |
2654 | ret = 0; | |
2655 | goto out; | |
2656 | } | |
2657 | ||
2658 | ret = -ENOMEM; | |
2659 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2660 | if (!data) | |
2661 | goto out; | |
2662 | ||
2663 | data->enable = enable; | |
2664 | data->count = -1; | |
2665 | data->file = file; | |
2666 | ||
2667 | if (!param) | |
2668 | goto out_reg; | |
2669 | ||
2670 | number = strsep(¶m, ":"); | |
2671 | ||
2672 | ret = -EINVAL; | |
2673 | if (!strlen(number)) | |
2674 | goto out_free; | |
2675 | ||
2676 | /* | |
2677 | * We use the callback data field (which is a pointer) | |
2678 | * as our counter. | |
2679 | */ | |
2680 | ret = kstrtoul(number, 0, &data->count); | |
2681 | if (ret) | |
2682 | goto out_free; | |
2683 | ||
2684 | out_reg: | |
2685 | /* Don't let event modules unload while probe registered */ | |
2686 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2687 | if (!ret) { |
2688 | ret = -EBUSY; | |
3cd715de | 2689 | goto out_free; |
6ed01066 | 2690 | } |
3cd715de SRRH |
2691 | |
2692 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2693 | if (ret < 0) | |
2694 | goto out_put; | |
2695 | ret = register_ftrace_function_probe(glob, ops, data); | |
ff305ded SRRH |
2696 | /* |
2697 | * The above returns on success the # of functions enabled, | |
2698 | * but if it didn't find any functions it returns zero. | |
2699 | * Consider no functions a failure too. | |
2700 | */ | |
a5b85bd1 MH |
2701 | if (!ret) { |
2702 | ret = -ENOENT; | |
3cd715de | 2703 | goto out_disable; |
ff305ded SRRH |
2704 | } else if (ret < 0) |
2705 | goto out_disable; | |
2706 | /* Just return zero, not the number of enabled functions */ | |
2707 | ret = 0; | |
3cd715de SRRH |
2708 | out: |
2709 | mutex_unlock(&event_mutex); | |
2710 | return ret; | |
2711 | ||
2712 | out_disable: | |
2713 | __ftrace_event_enable_disable(file, 0, 1); | |
2714 | out_put: | |
2715 | module_put(file->event_call->mod); | |
2716 | out_free: | |
2717 | kfree(data); | |
2718 | goto out; | |
2719 | } | |
2720 | ||
2721 | static struct ftrace_func_command event_enable_cmd = { | |
2722 | .name = ENABLE_EVENT_STR, | |
2723 | .func = event_enable_func, | |
2724 | }; | |
2725 | ||
2726 | static struct ftrace_func_command event_disable_cmd = { | |
2727 | .name = DISABLE_EVENT_STR, | |
2728 | .func = event_enable_func, | |
2729 | }; | |
2730 | ||
2731 | static __init int register_event_cmds(void) | |
2732 | { | |
2733 | int ret; | |
2734 | ||
2735 | ret = register_ftrace_command(&event_enable_cmd); | |
2736 | if (WARN_ON(ret < 0)) | |
2737 | return ret; | |
2738 | ret = register_ftrace_command(&event_disable_cmd); | |
2739 | if (WARN_ON(ret < 0)) | |
2740 | unregister_ftrace_command(&event_enable_cmd); | |
2741 | return ret; | |
2742 | } | |
2743 | #else | |
2744 | static inline int register_event_cmds(void) { return 0; } | |
2745 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2746 | ||
77248221 | 2747 | /* |
7f1d2f82 | 2748 | * The top level array has already had its trace_event_file |
77248221 | 2749 | * descriptors created in order to allow for early events to |
8434dc93 | 2750 | * be recorded. This function is called after the tracefs has been |
77248221 SR |
2751 | * initialized, and we now have to create the files associated |
2752 | * to the events. | |
2753 | */ | |
2754 | static __init void | |
2755 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2756 | { | |
7f1d2f82 | 2757 | struct trace_event_file *file; |
77248221 SR |
2758 | int ret; |
2759 | ||
2760 | ||
2761 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 2762 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 2763 | if (ret < 0) |
3448bac3 | 2764 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2765 | trace_event_name(file->event_call)); |
77248221 SR |
2766 | } |
2767 | } | |
2768 | ||
2769 | /* | |
2770 | * For early boot up, the top trace array requires to have | |
2771 | * a list of events that can be enabled. This must be done before | |
2772 | * the filesystem is set up in order to allow events to be traced | |
2773 | * early. | |
2774 | */ | |
2775 | static __init void | |
2776 | __trace_early_add_events(struct trace_array *tr) | |
2777 | { | |
2425bcb9 | 2778 | struct trace_event_call *call; |
77248221 SR |
2779 | int ret; |
2780 | ||
2781 | list_for_each_entry(call, &ftrace_events, list) { | |
2782 | /* Early boot up should not have any modules loaded */ | |
2783 | if (WARN_ON_ONCE(call->mod)) | |
2784 | continue; | |
2785 | ||
2786 | ret = __trace_early_add_new_event(call, tr); | |
2787 | if (ret < 0) | |
3448bac3 | 2788 | pr_warn("Could not create early event %s\n", |
687fcc4a | 2789 | trace_event_name(call)); |
77248221 SR |
2790 | } |
2791 | } | |
2792 | ||
0c8916c3 SR |
2793 | /* Remove the event directory structure for a trace directory. */ |
2794 | static void | |
2795 | __trace_remove_event_dirs(struct trace_array *tr) | |
2796 | { | |
7f1d2f82 | 2797 | struct trace_event_file *file, *next; |
0c8916c3 | 2798 | |
f6a84bdc ON |
2799 | list_for_each_entry_safe(file, next, &tr->events, list) |
2800 | remove_event_file_dir(file); | |
0c8916c3 SR |
2801 | } |
2802 | ||
2425bcb9 | 2803 | static void __add_event_to_tracers(struct trace_event_call *call) |
ae63b31e SR |
2804 | { |
2805 | struct trace_array *tr; | |
2806 | ||
620a30e9 ON |
2807 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
2808 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
2809 | } |
2810 | ||
2425bcb9 SRRH |
2811 | extern struct trace_event_call *__start_ftrace_events[]; |
2812 | extern struct trace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2813 | |
020e5f85 LZ |
2814 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2815 | ||
2816 | static __init int setup_trace_event(char *str) | |
2817 | { | |
2818 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2819 | ring_buffer_expanded = true; |
2820 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2821 | |
2822 | return 1; | |
2823 | } | |
2824 | __setup("trace_event=", setup_trace_event); | |
2825 | ||
77248221 SR |
2826 | /* Expects to have event_mutex held when called */ |
2827 | static int | |
2828 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2829 | { |
2830 | struct dentry *d_events; | |
2831 | struct dentry *entry; | |
2832 | ||
8434dc93 | 2833 | entry = tracefs_create_file("set_event", 0644, parent, |
ae63b31e SR |
2834 | tr, &ftrace_set_event_fops); |
2835 | if (!entry) { | |
8434dc93 | 2836 | pr_warn("Could not create tracefs 'set_event' entry\n"); |
ae63b31e SR |
2837 | return -ENOMEM; |
2838 | } | |
2839 | ||
8434dc93 | 2840 | d_events = tracefs_create_dir("events", parent); |
277ba044 | 2841 | if (!d_events) { |
8434dc93 | 2842 | pr_warn("Could not create tracefs 'events' directory\n"); |
277ba044 SR |
2843 | return -ENOMEM; |
2844 | } | |
ae63b31e | 2845 | |
49090107 SRRH |
2846 | entry = tracefs_create_file("set_event_pid", 0644, parent, |
2847 | tr, &ftrace_set_event_pid_fops); | |
2848 | ||
ae63b31e SR |
2849 | /* ring buffer internal formats */ |
2850 | trace_create_file("header_page", 0444, d_events, | |
2851 | ring_buffer_print_page_header, | |
2852 | &ftrace_show_header_fops); | |
2853 | ||
2854 | trace_create_file("header_event", 0444, d_events, | |
2855 | ring_buffer_print_entry_header, | |
2856 | &ftrace_show_header_fops); | |
2857 | ||
2858 | trace_create_file("enable", 0644, d_events, | |
2859 | tr, &ftrace_tr_enable_fops); | |
2860 | ||
2861 | tr->event_dir = d_events; | |
77248221 SR |
2862 | |
2863 | return 0; | |
2864 | } | |
2865 | ||
2866 | /** | |
2867 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2868 | * @parent: The parent dentry to place the files/directories for events in | |
2869 | * @tr: The trace array associated with these events | |
2870 | * | |
2871 | * When a new instance is created, it needs to set up its events | |
2872 | * directory, as well as other files associated with events. It also | |
2873 | * creates the event hierachry in the @parent/events directory. | |
2874 | * | |
2875 | * Returns 0 on success. | |
2876 | */ | |
2877 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2878 | { | |
2879 | int ret; | |
2880 | ||
2881 | mutex_lock(&event_mutex); | |
2882 | ||
2883 | ret = create_event_toplevel_files(parent, tr); | |
2884 | if (ret) | |
2885 | goto out_unlock; | |
2886 | ||
52f6ad6d | 2887 | down_write(&trace_event_sem); |
ae63b31e | 2888 | __trace_add_event_dirs(tr); |
52f6ad6d | 2889 | up_write(&trace_event_sem); |
277ba044 | 2890 | |
77248221 | 2891 | out_unlock: |
277ba044 | 2892 | mutex_unlock(&event_mutex); |
ae63b31e | 2893 | |
77248221 SR |
2894 | return ret; |
2895 | } | |
2896 | ||
2897 | /* | |
2898 | * The top trace array already had its file descriptors created. | |
2899 | * Now the files themselves need to be created. | |
2900 | */ | |
2901 | static __init int | |
2902 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2903 | { | |
2904 | int ret; | |
2905 | ||
2906 | mutex_lock(&event_mutex); | |
2907 | ||
2908 | ret = create_event_toplevel_files(parent, tr); | |
2909 | if (ret) | |
2910 | goto out_unlock; | |
2911 | ||
52f6ad6d | 2912 | down_write(&trace_event_sem); |
77248221 | 2913 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 2914 | up_write(&trace_event_sem); |
77248221 SR |
2915 | |
2916 | out_unlock: | |
2917 | mutex_unlock(&event_mutex); | |
2918 | ||
2919 | return ret; | |
ae63b31e SR |
2920 | } |
2921 | ||
0c8916c3 SR |
2922 | int event_trace_del_tracer(struct trace_array *tr) |
2923 | { | |
0c8916c3 SR |
2924 | mutex_lock(&event_mutex); |
2925 | ||
85f2b082 TZ |
2926 | /* Disable any event triggers and associated soft-disabled events */ |
2927 | clear_event_triggers(tr); | |
2928 | ||
49090107 SRRH |
2929 | /* Clear the pid list */ |
2930 | __ftrace_clear_event_pids(tr); | |
2931 | ||
2a6c24af SRRH |
2932 | /* Disable any running events */ |
2933 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
2934 | ||
3ccb0123 SR |
2935 | /* Access to events are within rcu_read_lock_sched() */ |
2936 | synchronize_sched(); | |
2937 | ||
52f6ad6d | 2938 | down_write(&trace_event_sem); |
0c8916c3 | 2939 | __trace_remove_event_dirs(tr); |
8434dc93 | 2940 | tracefs_remove_recursive(tr->event_dir); |
52f6ad6d | 2941 | up_write(&trace_event_sem); |
0c8916c3 SR |
2942 | |
2943 | tr->event_dir = NULL; | |
2944 | ||
2945 | mutex_unlock(&event_mutex); | |
2946 | ||
2947 | return 0; | |
2948 | } | |
2949 | ||
d1a29143 SR |
2950 | static __init int event_trace_memsetup(void) |
2951 | { | |
2952 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
7f1d2f82 | 2953 | file_cachep = KMEM_CACHE(trace_event_file, SLAB_PANIC); |
d1a29143 SR |
2954 | return 0; |
2955 | } | |
2956 | ||
ce1039bd SRRH |
2957 | static __init void |
2958 | early_enable_events(struct trace_array *tr, bool disable_first) | |
2959 | { | |
2960 | char *buf = bootup_event_buf; | |
2961 | char *token; | |
2962 | int ret; | |
2963 | ||
2964 | while (true) { | |
2965 | token = strsep(&buf, ","); | |
2966 | ||
2967 | if (!token) | |
2968 | break; | |
ce1039bd | 2969 | |
43ed3843 SRRH |
2970 | if (*token) { |
2971 | /* Restarting syscalls requires that we stop them first */ | |
2972 | if (disable_first) | |
2973 | ftrace_set_clr_event(tr, token, 0); | |
ce1039bd | 2974 | |
43ed3843 SRRH |
2975 | ret = ftrace_set_clr_event(tr, token, 1); |
2976 | if (ret) | |
2977 | pr_warn("Failed to enable trace event: %s\n", token); | |
2978 | } | |
ce1039bd SRRH |
2979 | |
2980 | /* Put back the comma to allow this to be called again */ | |
2981 | if (buf) | |
2982 | *(buf - 1) = ','; | |
2983 | } | |
2984 | } | |
2985 | ||
8781915a EG |
2986 | static __init int event_trace_enable(void) |
2987 | { | |
ae63b31e | 2988 | struct trace_array *tr = top_trace_array(); |
2425bcb9 | 2989 | struct trace_event_call **iter, *call; |
8781915a EG |
2990 | int ret; |
2991 | ||
dc81e5e3 YY |
2992 | if (!tr) |
2993 | return -ENODEV; | |
2994 | ||
8781915a EG |
2995 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
2996 | ||
2997 | call = *iter; | |
2998 | ret = event_init(call); | |
2999 | if (!ret) | |
3000 | list_add(&call->list, &ftrace_events); | |
3001 | } | |
3002 | ||
77248221 SR |
3003 | /* |
3004 | * We need the top trace array to have a working set of trace | |
3005 | * points at early init, before the debug files and directories | |
3006 | * are created. Create the file entries now, and attach them | |
3007 | * to the actual file dentries later. | |
3008 | */ | |
3009 | __trace_early_add_events(tr); | |
3010 | ||
ce1039bd | 3011 | early_enable_events(tr, false); |
81698831 SR |
3012 | |
3013 | trace_printk_start_comm(); | |
3014 | ||
3cd715de SRRH |
3015 | register_event_cmds(); |
3016 | ||
85f2b082 TZ |
3017 | register_trigger_cmds(); |
3018 | ||
8781915a EG |
3019 | return 0; |
3020 | } | |
3021 | ||
ce1039bd SRRH |
3022 | /* |
3023 | * event_trace_enable() is called from trace_event_init() first to | |
3024 | * initialize events and perhaps start any events that are on the | |
3025 | * command line. Unfortunately, there are some events that will not | |
3026 | * start this early, like the system call tracepoints that need | |
3027 | * to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable() | |
3028 | * is called before pid 1 starts, and this flag is never set, making | |
3029 | * the syscall tracepoint never get reached, but the event is enabled | |
3030 | * regardless (and not doing anything). | |
3031 | */ | |
3032 | static __init int event_trace_enable_again(void) | |
3033 | { | |
3034 | struct trace_array *tr; | |
3035 | ||
3036 | tr = top_trace_array(); | |
3037 | if (!tr) | |
3038 | return -ENODEV; | |
3039 | ||
3040 | early_enable_events(tr, true); | |
3041 | ||
3042 | return 0; | |
3043 | } | |
3044 | ||
3045 | early_initcall(event_trace_enable_again); | |
3046 | ||
b77e38aa SR |
3047 | static __init int event_trace_init(void) |
3048 | { | |
ae63b31e | 3049 | struct trace_array *tr; |
b77e38aa SR |
3050 | struct dentry *d_tracer; |
3051 | struct dentry *entry; | |
6d723736 | 3052 | int ret; |
b77e38aa | 3053 | |
ae63b31e | 3054 | tr = top_trace_array(); |
dc81e5e3 YY |
3055 | if (!tr) |
3056 | return -ENODEV; | |
ae63b31e | 3057 | |
b77e38aa | 3058 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 3059 | if (IS_ERR(d_tracer)) |
b77e38aa SR |
3060 | return 0; |
3061 | ||
8434dc93 | 3062 | entry = tracefs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 3063 | tr, &ftrace_avail_fops); |
2314c4ae | 3064 | if (!entry) |
8434dc93 | 3065 | pr_warn("Could not create tracefs 'available_events' entry\n"); |
2314c4ae | 3066 | |
9f616680 DW |
3067 | if (trace_define_generic_fields()) |
3068 | pr_warn("tracing: Failed to allocated generic fields"); | |
3069 | ||
8728fe50 | 3070 | if (trace_define_common_fields()) |
3448bac3 | 3071 | pr_warn("tracing: Failed to allocate common fields"); |
8728fe50 | 3072 | |
77248221 | 3073 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
3074 | if (ret) |
3075 | return ret; | |
020e5f85 | 3076 | |
836d481e | 3077 | #ifdef CONFIG_MODULES |
6d723736 | 3078 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 3079 | if (ret) |
3448bac3 | 3080 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 3081 | #endif |
b77e38aa SR |
3082 | return 0; |
3083 | } | |
5f893b26 SRRH |
3084 | |
3085 | void __init trace_event_init(void) | |
3086 | { | |
3087 | event_trace_memsetup(); | |
3088 | init_ftrace_syscalls(); | |
3089 | event_trace_enable(); | |
3090 | } | |
3091 | ||
b77e38aa | 3092 | fs_initcall(event_trace_init); |
e6187007 SR |
3093 | |
3094 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
3095 | ||
3096 | static DEFINE_SPINLOCK(test_spinlock); | |
3097 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
3098 | static DEFINE_MUTEX(test_mutex); | |
3099 | ||
3100 | static __init void test_work(struct work_struct *dummy) | |
3101 | { | |
3102 | spin_lock(&test_spinlock); | |
3103 | spin_lock_irq(&test_spinlock_irq); | |
3104 | udelay(1); | |
3105 | spin_unlock_irq(&test_spinlock_irq); | |
3106 | spin_unlock(&test_spinlock); | |
3107 | ||
3108 | mutex_lock(&test_mutex); | |
3109 | msleep(1); | |
3110 | mutex_unlock(&test_mutex); | |
3111 | } | |
3112 | ||
3113 | static __init int event_test_thread(void *unused) | |
3114 | { | |
3115 | void *test_malloc; | |
3116 | ||
3117 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
3118 | if (!test_malloc) | |
3119 | pr_info("failed to kmalloc\n"); | |
3120 | ||
3121 | schedule_on_each_cpu(test_work); | |
3122 | ||
3123 | kfree(test_malloc); | |
3124 | ||
3125 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 3126 | while (!kthread_should_stop()) { |
e6187007 | 3127 | schedule(); |
fe0e01c7 PZ |
3128 | set_current_state(TASK_INTERRUPTIBLE); |
3129 | } | |
3130 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
3131 | |
3132 | return 0; | |
3133 | } | |
3134 | ||
3135 | /* | |
3136 | * Do various things that may trigger events. | |
3137 | */ | |
3138 | static __init void event_test_stuff(void) | |
3139 | { | |
3140 | struct task_struct *test_thread; | |
3141 | ||
3142 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
3143 | msleep(1); | |
3144 | kthread_stop(test_thread); | |
3145 | } | |
3146 | ||
3147 | /* | |
3148 | * For every trace event defined, we will test each trace point separately, | |
3149 | * and then by groups, and finally all trace points. | |
3150 | */ | |
9ea21c1e | 3151 | static __init void event_trace_self_tests(void) |
e6187007 | 3152 | { |
7967b3e0 | 3153 | struct trace_subsystem_dir *dir; |
7f1d2f82 | 3154 | struct trace_event_file *file; |
2425bcb9 | 3155 | struct trace_event_call *call; |
e6187007 | 3156 | struct event_subsystem *system; |
ae63b31e | 3157 | struct trace_array *tr; |
e6187007 SR |
3158 | int ret; |
3159 | ||
ae63b31e | 3160 | tr = top_trace_array(); |
dc81e5e3 YY |
3161 | if (!tr) |
3162 | return; | |
ae63b31e | 3163 | |
e6187007 SR |
3164 | pr_info("Running tests on trace events:\n"); |
3165 | ||
ae63b31e SR |
3166 | list_for_each_entry(file, &tr->events, list) { |
3167 | ||
3168 | call = file->event_call; | |
e6187007 | 3169 | |
2239291a SR |
3170 | /* Only test those that have a probe */ |
3171 | if (!call->class || !call->class->probe) | |
e6187007 SR |
3172 | continue; |
3173 | ||
1f5a6b45 SR |
3174 | /* |
3175 | * Testing syscall events here is pretty useless, but | |
3176 | * we still do it if configured. But this is time consuming. | |
3177 | * What we really need is a user thread to perform the | |
3178 | * syscalls as we test. | |
3179 | */ | |
3180 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
3181 | if (call->class->system && |
3182 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
3183 | continue; |
3184 | #endif | |
3185 | ||
687fcc4a | 3186 | pr_info("Testing event %s: ", trace_event_name(call)); |
e6187007 SR |
3187 | |
3188 | /* | |
3189 | * If an event is already enabled, someone is using | |
3190 | * it and the self test should not be on. | |
3191 | */ | |
5d6ad960 | 3192 | if (file->flags & EVENT_FILE_FL_ENABLED) { |
3448bac3 | 3193 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
3194 | WARN_ON_ONCE(1); |
3195 | continue; | |
3196 | } | |
3197 | ||
ae63b31e | 3198 | ftrace_event_enable_disable(file, 1); |
e6187007 | 3199 | event_test_stuff(); |
ae63b31e | 3200 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
3201 | |
3202 | pr_cont("OK\n"); | |
3203 | } | |
3204 | ||
3205 | /* Now test at the sub system level */ | |
3206 | ||
3207 | pr_info("Running tests on trace event systems:\n"); | |
3208 | ||
ae63b31e SR |
3209 | list_for_each_entry(dir, &tr->systems, list) { |
3210 | ||
3211 | system = dir->subsystem; | |
e6187007 SR |
3212 | |
3213 | /* the ftrace system is special, skip it */ | |
3214 | if (strcmp(system->name, "ftrace") == 0) | |
3215 | continue; | |
3216 | ||
3217 | pr_info("Testing event system %s: ", system->name); | |
3218 | ||
ae63b31e | 3219 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 3220 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3221 | pr_warn("error enabling system %s\n", |
3222 | system->name); | |
e6187007 SR |
3223 | continue; |
3224 | } | |
3225 | ||
3226 | event_test_stuff(); | |
3227 | ||
ae63b31e | 3228 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 3229 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3230 | pr_warn("error disabling system %s\n", |
3231 | system->name); | |
76bab1b7 YL |
3232 | continue; |
3233 | } | |
e6187007 SR |
3234 | |
3235 | pr_cont("OK\n"); | |
3236 | } | |
3237 | ||
3238 | /* Test with all events enabled */ | |
3239 | ||
3240 | pr_info("Running tests on all trace events:\n"); | |
3241 | pr_info("Testing all events: "); | |
3242 | ||
ae63b31e | 3243 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 3244 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3245 | pr_warn("error enabling all events\n"); |
9ea21c1e | 3246 | return; |
e6187007 SR |
3247 | } |
3248 | ||
3249 | event_test_stuff(); | |
3250 | ||
3251 | /* reset sysname */ | |
ae63b31e | 3252 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 3253 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3254 | pr_warn("error disabling all events\n"); |
9ea21c1e | 3255 | return; |
e6187007 SR |
3256 | } |
3257 | ||
3258 | pr_cont("OK\n"); | |
9ea21c1e SR |
3259 | } |
3260 | ||
3261 | #ifdef CONFIG_FUNCTION_TRACER | |
3262 | ||
245b2e70 | 3263 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e | 3264 | |
9b9db275 | 3265 | static struct trace_event_file event_trace_file __initdata; |
b7f0c959 SRRH |
3266 | |
3267 | static void __init | |
2f5f6ad9 | 3268 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 3269 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
3270 | { |
3271 | struct ring_buffer_event *event; | |
e77405ad | 3272 | struct ring_buffer *buffer; |
9ea21c1e SR |
3273 | struct ftrace_entry *entry; |
3274 | unsigned long flags; | |
3275 | long disabled; | |
9ea21c1e SR |
3276 | int cpu; |
3277 | int pc; | |
3278 | ||
3279 | pc = preempt_count(); | |
5168ae50 | 3280 | preempt_disable_notrace(); |
9ea21c1e | 3281 | cpu = raw_smp_processor_id(); |
245b2e70 | 3282 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
3283 | |
3284 | if (disabled != 1) | |
3285 | goto out; | |
3286 | ||
3287 | local_save_flags(flags); | |
3288 | ||
9b9db275 SRRH |
3289 | event = trace_event_buffer_lock_reserve(&buffer, &event_trace_file, |
3290 | TRACE_FN, sizeof(*entry), | |
3291 | flags, pc); | |
9ea21c1e SR |
3292 | if (!event) |
3293 | goto out; | |
3294 | entry = ring_buffer_event_data(event); | |
3295 | entry->ip = ip; | |
3296 | entry->parent_ip = parent_ip; | |
3297 | ||
9b9db275 SRRH |
3298 | event_trigger_unlock_commit(&event_trace_file, buffer, event, |
3299 | entry, flags, pc); | |
9ea21c1e | 3300 | out: |
245b2e70 | 3301 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 3302 | preempt_enable_notrace(); |
9ea21c1e SR |
3303 | } |
3304 | ||
3305 | static struct ftrace_ops trace_ops __initdata = | |
3306 | { | |
3307 | .func = function_test_events_call, | |
4740974a | 3308 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
3309 | }; |
3310 | ||
3311 | static __init void event_trace_self_test_with_function(void) | |
3312 | { | |
17bb615a | 3313 | int ret; |
9b9db275 SRRH |
3314 | |
3315 | event_trace_file.tr = top_trace_array(); | |
3316 | if (WARN_ON(!event_trace_file.tr)) | |
2d34f489 | 3317 | return; |
9b9db275 | 3318 | |
17bb615a SR |
3319 | ret = register_ftrace_function(&trace_ops); |
3320 | if (WARN_ON(ret < 0)) { | |
3321 | pr_info("Failed to enable function tracer for event tests\n"); | |
3322 | return; | |
3323 | } | |
9ea21c1e SR |
3324 | pr_info("Running tests again, along with the function tracer\n"); |
3325 | event_trace_self_tests(); | |
3326 | unregister_ftrace_function(&trace_ops); | |
3327 | } | |
3328 | #else | |
3329 | static __init void event_trace_self_test_with_function(void) | |
3330 | { | |
3331 | } | |
3332 | #endif | |
3333 | ||
3334 | static __init int event_trace_self_tests_init(void) | |
3335 | { | |
020e5f85 LZ |
3336 | if (!tracing_selftest_disabled) { |
3337 | event_trace_self_tests(); | |
3338 | event_trace_self_test_with_function(); | |
3339 | } | |
e6187007 SR |
3340 | |
3341 | return 0; | |
3342 | } | |
3343 | ||
28d20e2d | 3344 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
3345 | |
3346 | #endif |