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 | 17 | #include <linux/uaccess.h> |
49090107 | 18 | #include <linux/bsearch.h> |
b77e38aa SR |
19 | #include <linux/module.h> |
20 | #include <linux/ctype.h> | |
49090107 | 21 | #include <linux/sort.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
e6187007 | 23 | #include <linux/delay.h> |
b77e38aa | 24 | |
3fdaf80f SRRH |
25 | #include <trace/events/sched.h> |
26 | ||
020e5f85 LZ |
27 | #include <asm/setup.h> |
28 | ||
91729ef9 | 29 | #include "trace_output.h" |
b77e38aa | 30 | |
4e5292ea | 31 | #undef TRACE_SYSTEM |
b628b3e6 SR |
32 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
33 | ||
20c8928a | 34 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 35 | |
a59fd602 | 36 | LIST_HEAD(ftrace_events); |
9f616680 | 37 | static LIST_HEAD(ftrace_generic_fields); |
b3a8c6fd | 38 | static LIST_HEAD(ftrace_common_fields); |
a59fd602 | 39 | |
d1a29143 SR |
40 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
41 | ||
42 | static struct kmem_cache *field_cachep; | |
43 | static struct kmem_cache *file_cachep; | |
44 | ||
6e94a780 SR |
45 | static inline int system_refcount(struct event_subsystem *system) |
46 | { | |
79ac6ef5 | 47 | return system->ref_count; |
6e94a780 SR |
48 | } |
49 | ||
50 | static int system_refcount_inc(struct event_subsystem *system) | |
51 | { | |
79ac6ef5 | 52 | return system->ref_count++; |
6e94a780 SR |
53 | } |
54 | ||
55 | static int system_refcount_dec(struct event_subsystem *system) | |
56 | { | |
79ac6ef5 | 57 | return --system->ref_count; |
6e94a780 SR |
58 | } |
59 | ||
ae63b31e SR |
60 | /* Double loops, do not use break, only goto's work */ |
61 | #define do_for_each_event_file(tr, file) \ | |
62 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
63 | list_for_each_entry(file, &tr->events, list) | |
64 | ||
65 | #define do_for_each_event_file_safe(tr, file) \ | |
66 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
7f1d2f82 | 67 | struct trace_event_file *___n; \ |
ae63b31e SR |
68 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
69 | ||
70 | #define while_for_each_event_file() \ | |
71 | } | |
72 | ||
b3a8c6fd | 73 | static struct list_head * |
2425bcb9 | 74 | trace_get_fields(struct trace_event_call *event_call) |
2e33af02 SR |
75 | { |
76 | if (!event_call->class->get_fields) | |
77 | return &event_call->class->fields; | |
78 | return event_call->class->get_fields(event_call); | |
79 | } | |
80 | ||
b3a8c6fd J |
81 | static struct ftrace_event_field * |
82 | __find_event_field(struct list_head *head, char *name) | |
83 | { | |
84 | struct ftrace_event_field *field; | |
85 | ||
86 | list_for_each_entry(field, head, link) { | |
87 | if (!strcmp(field->name, name)) | |
88 | return field; | |
89 | } | |
90 | ||
91 | return NULL; | |
92 | } | |
93 | ||
94 | struct ftrace_event_field * | |
2425bcb9 | 95 | trace_find_event_field(struct trace_event_call *call, char *name) |
b3a8c6fd J |
96 | { |
97 | struct ftrace_event_field *field; | |
98 | struct list_head *head; | |
99 | ||
9f616680 DW |
100 | field = __find_event_field(&ftrace_generic_fields, name); |
101 | if (field) | |
102 | return field; | |
103 | ||
b3a8c6fd J |
104 | field = __find_event_field(&ftrace_common_fields, name); |
105 | if (field) | |
106 | return field; | |
107 | ||
108 | head = trace_get_fields(call); | |
109 | return __find_event_field(head, name); | |
110 | } | |
111 | ||
8728fe50 LZ |
112 | static int __trace_define_field(struct list_head *head, const char *type, |
113 | const char *name, int offset, int size, | |
114 | int is_signed, int filter_type) | |
cf027f64 TZ |
115 | { |
116 | struct ftrace_event_field *field; | |
117 | ||
d1a29143 | 118 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 119 | if (!field) |
aaf6ac0f | 120 | return -ENOMEM; |
fe9f57f2 | 121 | |
92edca07 SR |
122 | field->name = name; |
123 | field->type = type; | |
fe9f57f2 | 124 | |
43b51ead LZ |
125 | if (filter_type == FILTER_OTHER) |
126 | field->filter_type = filter_assign_type(type); | |
127 | else | |
128 | field->filter_type = filter_type; | |
129 | ||
cf027f64 TZ |
130 | field->offset = offset; |
131 | field->size = size; | |
a118e4d1 | 132 | field->is_signed = is_signed; |
aa38e9fc | 133 | |
2e33af02 | 134 | list_add(&field->link, head); |
cf027f64 TZ |
135 | |
136 | return 0; | |
cf027f64 | 137 | } |
8728fe50 | 138 | |
2425bcb9 | 139 | int trace_define_field(struct trace_event_call *call, const char *type, |
8728fe50 LZ |
140 | const char *name, int offset, int size, int is_signed, |
141 | int filter_type) | |
142 | { | |
143 | struct list_head *head; | |
144 | ||
145 | if (WARN_ON(!call->class)) | |
146 | return 0; | |
147 | ||
148 | head = trace_get_fields(call); | |
149 | return __trace_define_field(head, type, name, offset, size, | |
150 | is_signed, filter_type); | |
151 | } | |
17c873ec | 152 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 153 | |
9f616680 DW |
154 | #define __generic_field(type, item, filter_type) \ |
155 | ret = __trace_define_field(&ftrace_generic_fields, #type, \ | |
156 | #item, 0, 0, is_signed_type(type), \ | |
157 | filter_type); \ | |
158 | if (ret) \ | |
159 | return ret; | |
160 | ||
e647d6b3 | 161 | #define __common_field(type, item) \ |
8728fe50 LZ |
162 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
163 | "common_" #item, \ | |
164 | offsetof(typeof(ent), item), \ | |
165 | sizeof(ent.item), \ | |
166 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
167 | if (ret) \ |
168 | return ret; | |
169 | ||
9f616680 DW |
170 | static int trace_define_generic_fields(void) |
171 | { | |
172 | int ret; | |
173 | ||
174 | __generic_field(int, cpu, FILTER_OTHER); | |
175 | __generic_field(char *, comm, FILTER_PTR_STRING); | |
176 | ||
177 | return ret; | |
178 | } | |
179 | ||
8728fe50 | 180 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
181 | { |
182 | int ret; | |
183 | struct trace_entry ent; | |
184 | ||
185 | __common_field(unsigned short, type); | |
186 | __common_field(unsigned char, flags); | |
187 | __common_field(unsigned char, preempt_count); | |
188 | __common_field(int, pid); | |
e647d6b3 LZ |
189 | |
190 | return ret; | |
191 | } | |
192 | ||
2425bcb9 | 193 | static void trace_destroy_fields(struct trace_event_call *call) |
2df75e41 LZ |
194 | { |
195 | struct ftrace_event_field *field, *next; | |
2e33af02 | 196 | struct list_head *head; |
2df75e41 | 197 | |
2e33af02 SR |
198 | head = trace_get_fields(call); |
199 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 200 | list_del(&field->link); |
d1a29143 | 201 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
202 | } |
203 | } | |
204 | ||
2425bcb9 | 205 | int trace_event_raw_init(struct trace_event_call *call) |
87d9b4e1 LZ |
206 | { |
207 | int id; | |
208 | ||
9023c930 | 209 | id = register_trace_event(&call->event); |
87d9b4e1 LZ |
210 | if (!id) |
211 | return -ENODEV; | |
87d9b4e1 LZ |
212 | |
213 | return 0; | |
214 | } | |
215 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
216 | ||
3fdaf80f SRRH |
217 | bool trace_event_ignore_this_pid(struct trace_event_file *trace_file) |
218 | { | |
219 | struct trace_array *tr = trace_file->tr; | |
220 | struct trace_array_cpu *data; | |
221 | struct trace_pid_list *pid_list; | |
222 | ||
223 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
224 | if (!pid_list) | |
225 | return false; | |
226 | ||
227 | data = this_cpu_ptr(tr->trace_buffer.data); | |
228 | ||
229 | return data->ignore_pid; | |
230 | } | |
231 | EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid); | |
232 | ||
3f795dcf SRRH |
233 | void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, |
234 | struct trace_event_file *trace_file, | |
235 | unsigned long len) | |
3fd40d1e | 236 | { |
2425bcb9 | 237 | struct trace_event_call *event_call = trace_file->event_call; |
3fd40d1e | 238 | |
3fdaf80f SRRH |
239 | if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) && |
240 | trace_event_ignore_this_pid(trace_file)) | |
241 | return NULL; | |
242 | ||
3fd40d1e SR |
243 | local_save_flags(fbuffer->flags); |
244 | fbuffer->pc = preempt_count(); | |
7f1d2f82 | 245 | fbuffer->trace_file = trace_file; |
3fd40d1e SR |
246 | |
247 | fbuffer->event = | |
7f1d2f82 | 248 | trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, |
3fd40d1e SR |
249 | event_call->event.type, len, |
250 | fbuffer->flags, fbuffer->pc); | |
251 | if (!fbuffer->event) | |
252 | return NULL; | |
253 | ||
254 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); | |
255 | return fbuffer->entry; | |
256 | } | |
3f795dcf | 257 | EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); |
3fd40d1e | 258 | |
0daa2302 SRRH |
259 | static DEFINE_SPINLOCK(tracepoint_iter_lock); |
260 | ||
3f795dcf | 261 | static void output_printk(struct trace_event_buffer *fbuffer) |
0daa2302 | 262 | { |
2425bcb9 | 263 | struct trace_event_call *event_call; |
0daa2302 SRRH |
264 | struct trace_event *event; |
265 | unsigned long flags; | |
266 | struct trace_iterator *iter = tracepoint_print_iter; | |
267 | ||
268 | if (!iter) | |
269 | return; | |
270 | ||
7f1d2f82 | 271 | event_call = fbuffer->trace_file->event_call; |
0daa2302 SRRH |
272 | if (!event_call || !event_call->event.funcs || |
273 | !event_call->event.funcs->trace) | |
274 | return; | |
275 | ||
7f1d2f82 | 276 | event = &fbuffer->trace_file->event_call->event; |
0daa2302 SRRH |
277 | |
278 | spin_lock_irqsave(&tracepoint_iter_lock, flags); | |
279 | trace_seq_init(&iter->seq); | |
280 | iter->ent = fbuffer->entry; | |
281 | event_call->event.funcs->trace(iter, 0, event); | |
282 | trace_seq_putc(&iter->seq, 0); | |
283 | printk("%s", iter->seq.buffer); | |
284 | ||
285 | spin_unlock_irqrestore(&tracepoint_iter_lock, flags); | |
286 | } | |
287 | ||
3f795dcf | 288 | void trace_event_buffer_commit(struct trace_event_buffer *fbuffer) |
3fd40d1e | 289 | { |
0daa2302 SRRH |
290 | if (tracepoint_printk) |
291 | output_printk(fbuffer); | |
292 | ||
7f1d2f82 | 293 | event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer, |
3fd40d1e SR |
294 | fbuffer->event, fbuffer->entry, |
295 | fbuffer->flags, fbuffer->pc); | |
296 | } | |
3f795dcf | 297 | EXPORT_SYMBOL_GPL(trace_event_buffer_commit); |
3fd40d1e | 298 | |
2425bcb9 | 299 | int trace_event_reg(struct trace_event_call *call, |
9023c930 | 300 | enum trace_reg type, void *data) |
a1d0ce82 | 301 | { |
7f1d2f82 | 302 | struct trace_event_file *file = data; |
ae63b31e | 303 | |
de7b2973 | 304 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
a1d0ce82 SR |
305 | switch (type) { |
306 | case TRACE_REG_REGISTER: | |
de7b2973 | 307 | return tracepoint_probe_register(call->tp, |
a1d0ce82 | 308 | call->class->probe, |
ae63b31e | 309 | file); |
a1d0ce82 | 310 | case TRACE_REG_UNREGISTER: |
de7b2973 | 311 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 | 312 | call->class->probe, |
ae63b31e | 313 | file); |
a1d0ce82 SR |
314 | return 0; |
315 | ||
316 | #ifdef CONFIG_PERF_EVENTS | |
317 | case TRACE_REG_PERF_REGISTER: | |
de7b2973 | 318 | return tracepoint_probe_register(call->tp, |
a1d0ce82 SR |
319 | call->class->perf_probe, |
320 | call); | |
321 | case TRACE_REG_PERF_UNREGISTER: | |
de7b2973 | 322 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 SR |
323 | call->class->perf_probe, |
324 | call); | |
325 | return 0; | |
ceec0b6f JO |
326 | case TRACE_REG_PERF_OPEN: |
327 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
328 | case TRACE_REG_PERF_ADD: |
329 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 330 | return 0; |
a1d0ce82 SR |
331 | #endif |
332 | } | |
333 | return 0; | |
334 | } | |
9023c930 | 335 | EXPORT_SYMBOL_GPL(trace_event_reg); |
a1d0ce82 | 336 | |
e870e9a1 LZ |
337 | void trace_event_enable_cmd_record(bool enable) |
338 | { | |
7f1d2f82 | 339 | struct trace_event_file *file; |
ae63b31e | 340 | struct trace_array *tr; |
e870e9a1 LZ |
341 | |
342 | mutex_lock(&event_mutex); | |
ae63b31e SR |
343 | do_for_each_event_file(tr, file) { |
344 | ||
5d6ad960 | 345 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) |
e870e9a1 LZ |
346 | continue; |
347 | ||
348 | if (enable) { | |
349 | tracing_start_cmdline_record(); | |
5d6ad960 | 350 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
351 | } else { |
352 | tracing_stop_cmdline_record(); | |
5d6ad960 | 353 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 354 | } |
ae63b31e | 355 | } while_for_each_event_file(); |
e870e9a1 LZ |
356 | mutex_unlock(&event_mutex); |
357 | } | |
358 | ||
7f1d2f82 | 359 | static int __ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 | 360 | int enable, int soft_disable) |
fd994989 | 361 | { |
2425bcb9 | 362 | struct trace_event_call *call = file->event_call; |
983f938a | 363 | struct trace_array *tr = file->tr; |
3b8e4273 | 364 | int ret = 0; |
417944c4 | 365 | int disable; |
3b8e4273 | 366 | |
fd994989 SR |
367 | switch (enable) { |
368 | case 0: | |
417944c4 | 369 | /* |
1cf4c073 MH |
370 | * When soft_disable is set and enable is cleared, the sm_ref |
371 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
372 | * to clear the SOFT_DISABLED flag but leave the event in the |
373 | * state that it was. That is, if the event was enabled and | |
374 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
375 | * is set we do not want the event to be enabled before we | |
376 | * clear the bit. | |
377 | * | |
378 | * When soft_disable is not set but the SOFT_MODE flag is, | |
379 | * we do nothing. Do not disable the tracepoint, otherwise | |
380 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
381 | */ | |
382 | if (soft_disable) { | |
1cf4c073 MH |
383 | if (atomic_dec_return(&file->sm_ref) > 0) |
384 | break; | |
5d6ad960 SRRH |
385 | disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; |
386 | clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); | |
417944c4 | 387 | } else |
5d6ad960 | 388 | disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); |
417944c4 | 389 | |
5d6ad960 SRRH |
390 | if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { |
391 | clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); | |
392 | if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { | |
e870e9a1 | 393 | tracing_stop_cmdline_record(); |
5d6ad960 | 394 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 395 | } |
ae63b31e | 396 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 397 | } |
3baa5e4c | 398 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
5d6ad960 SRRH |
399 | if (file->flags & EVENT_FILE_FL_SOFT_MODE) |
400 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c | 401 | else |
5d6ad960 | 402 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
fd994989 SR |
403 | break; |
404 | case 1: | |
417944c4 SRRH |
405 | /* |
406 | * When soft_disable is set and enable is set, we want to | |
407 | * register the tracepoint for the event, but leave the event | |
408 | * as is. That means, if the event was already enabled, we do | |
409 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
410 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
411 | * it still seems to be disabled. | |
412 | */ | |
413 | if (!soft_disable) | |
5d6ad960 | 414 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
1cf4c073 MH |
415 | else { |
416 | if (atomic_inc_return(&file->sm_ref) > 1) | |
417 | break; | |
5d6ad960 | 418 | set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 419 | } |
417944c4 | 420 | |
5d6ad960 | 421 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) { |
417944c4 SRRH |
422 | |
423 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
424 | if (soft_disable) | |
5d6ad960 | 425 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
417944c4 | 426 | |
983f938a | 427 | if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { |
e870e9a1 | 428 | tracing_start_cmdline_record(); |
5d6ad960 | 429 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 430 | } |
ae63b31e | 431 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
432 | if (ret) { |
433 | tracing_stop_cmdline_record(); | |
434 | pr_info("event trace: Could not enable event " | |
687fcc4a | 435 | "%s\n", trace_event_name(call)); |
3b8e4273 LZ |
436 | break; |
437 | } | |
5d6ad960 | 438 | set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
439 | |
440 | /* WAS_ENABLED gets set but never cleared. */ | |
441 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; | |
fd994989 | 442 | } |
fd994989 SR |
443 | break; |
444 | } | |
3b8e4273 LZ |
445 | |
446 | return ret; | |
fd994989 SR |
447 | } |
448 | ||
7f1d2f82 | 449 | int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 TZ |
450 | int enable, int soft_disable) |
451 | { | |
452 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
453 | } | |
454 | ||
7f1d2f82 | 455 | static int ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 SRRH |
456 | int enable) |
457 | { | |
458 | return __ftrace_event_enable_disable(file, enable, 0); | |
459 | } | |
460 | ||
ae63b31e | 461 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 462 | { |
7f1d2f82 | 463 | struct trace_event_file *file; |
0e907c99 Z |
464 | |
465 | mutex_lock(&event_mutex); | |
ae63b31e SR |
466 | list_for_each_entry(file, &tr->events, list) { |
467 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
468 | } |
469 | mutex_unlock(&event_mutex); | |
470 | } | |
471 | ||
49090107 SRRH |
472 | static int cmp_pid(const void *key, const void *elt) |
473 | { | |
474 | const pid_t *search_pid = key; | |
475 | const pid_t *pid = elt; | |
476 | ||
477 | if (*search_pid == *pid) | |
478 | return 0; | |
479 | if (*search_pid < *pid) | |
480 | return -1; | |
481 | return 1; | |
482 | } | |
483 | ||
3fdaf80f SRRH |
484 | static bool |
485 | check_ignore_pid(struct trace_pid_list *filtered_pids, struct task_struct *task) | |
486 | { | |
487 | pid_t search_pid; | |
488 | pid_t *pid; | |
489 | ||
490 | /* | |
491 | * Return false, because if filtered_pids does not exist, | |
492 | * all pids are good to trace. | |
493 | */ | |
494 | if (!filtered_pids) | |
495 | return false; | |
496 | ||
497 | search_pid = task->pid; | |
498 | ||
499 | pid = bsearch(&search_pid, filtered_pids->pids, | |
500 | filtered_pids->nr_pids, sizeof(pid_t), | |
501 | cmp_pid); | |
502 | if (!pid) | |
503 | return true; | |
504 | ||
505 | return false; | |
506 | } | |
507 | ||
508 | static void | |
22402cd0 | 509 | event_filter_pid_sched_switch_probe_pre(void *data, bool preempt, |
3fdaf80f SRRH |
510 | struct task_struct *prev, struct task_struct *next) |
511 | { | |
512 | struct trace_array *tr = data; | |
513 | struct trace_pid_list *pid_list; | |
514 | ||
515 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
516 | ||
517 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
518 | check_ignore_pid(pid_list, prev) && | |
519 | check_ignore_pid(pid_list, next)); | |
520 | } | |
521 | ||
522 | static void | |
22402cd0 | 523 | event_filter_pid_sched_switch_probe_post(void *data, bool preempt, |
3fdaf80f SRRH |
524 | struct task_struct *prev, struct task_struct *next) |
525 | { | |
526 | struct trace_array *tr = data; | |
527 | struct trace_pid_list *pid_list; | |
528 | ||
529 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
530 | ||
531 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
532 | check_ignore_pid(pid_list, next)); | |
533 | } | |
534 | ||
535 | static void | |
536 | event_filter_pid_sched_wakeup_probe_pre(void *data, struct task_struct *task) | |
537 | { | |
538 | struct trace_array *tr = data; | |
539 | struct trace_pid_list *pid_list; | |
540 | ||
541 | /* Nothing to do if we are already tracing */ | |
542 | if (!this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
543 | return; | |
544 | ||
545 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
546 | ||
547 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
548 | check_ignore_pid(pid_list, task)); | |
549 | } | |
550 | ||
551 | static void | |
552 | event_filter_pid_sched_wakeup_probe_post(void *data, struct task_struct *task) | |
553 | { | |
554 | struct trace_array *tr = data; | |
555 | struct trace_pid_list *pid_list; | |
556 | ||
557 | /* Nothing to do if we are not tracing */ | |
558 | if (this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
559 | return; | |
560 | ||
561 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
562 | ||
563 | /* Set tracing if current is enabled */ | |
564 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
565 | check_ignore_pid(pid_list, current)); | |
566 | } | |
567 | ||
49090107 SRRH |
568 | static void __ftrace_clear_event_pids(struct trace_array *tr) |
569 | { | |
570 | struct trace_pid_list *pid_list; | |
3fdaf80f SRRH |
571 | struct trace_event_file *file; |
572 | int cpu; | |
49090107 SRRH |
573 | |
574 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
575 | lockdep_is_held(&event_mutex)); | |
576 | if (!pid_list) | |
577 | return; | |
578 | ||
3fdaf80f SRRH |
579 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_pre, tr); |
580 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_post, tr); | |
581 | ||
582 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, tr); | |
583 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, tr); | |
584 | ||
0f72e37e SRRH |
585 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, tr); |
586 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, tr); | |
587 | ||
588 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_pre, tr); | |
589 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_post, tr); | |
590 | ||
3fdaf80f SRRH |
591 | list_for_each_entry(file, &tr->events, list) { |
592 | clear_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
593 | } | |
594 | ||
595 | for_each_possible_cpu(cpu) | |
596 | per_cpu_ptr(tr->trace_buffer.data, cpu)->ignore_pid = false; | |
597 | ||
49090107 SRRH |
598 | rcu_assign_pointer(tr->filtered_pids, NULL); |
599 | ||
600 | /* Wait till all users are no longer using pid filtering */ | |
601 | synchronize_sched(); | |
602 | ||
603 | free_pages((unsigned long)pid_list->pids, pid_list->order); | |
604 | kfree(pid_list); | |
605 | } | |
606 | ||
607 | static void ftrace_clear_event_pids(struct trace_array *tr) | |
608 | { | |
609 | mutex_lock(&event_mutex); | |
610 | __ftrace_clear_event_pids(tr); | |
611 | mutex_unlock(&event_mutex); | |
612 | } | |
613 | ||
e9dbfae5 SR |
614 | static void __put_system(struct event_subsystem *system) |
615 | { | |
616 | struct event_filter *filter = system->filter; | |
617 | ||
6e94a780 SR |
618 | WARN_ON_ONCE(system_refcount(system) == 0); |
619 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
620 | return; |
621 | ||
ae63b31e SR |
622 | list_del(&system->list); |
623 | ||
e9dbfae5 SR |
624 | if (filter) { |
625 | kfree(filter->filter_string); | |
626 | kfree(filter); | |
627 | } | |
79ac6ef5 | 628 | kfree_const(system->name); |
e9dbfae5 SR |
629 | kfree(system); |
630 | } | |
631 | ||
632 | static void __get_system(struct event_subsystem *system) | |
633 | { | |
6e94a780 SR |
634 | WARN_ON_ONCE(system_refcount(system) == 0); |
635 | system_refcount_inc(system); | |
e9dbfae5 SR |
636 | } |
637 | ||
7967b3e0 | 638 | static void __get_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
639 | { |
640 | WARN_ON_ONCE(dir->ref_count == 0); | |
641 | dir->ref_count++; | |
642 | __get_system(dir->subsystem); | |
643 | } | |
644 | ||
7967b3e0 | 645 | static void __put_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
646 | { |
647 | WARN_ON_ONCE(dir->ref_count == 0); | |
648 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 649 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
650 | |
651 | __put_system(dir->subsystem); | |
652 | if (!--dir->ref_count) | |
653 | kfree(dir); | |
654 | } | |
655 | ||
7967b3e0 | 656 | static void put_system(struct trace_subsystem_dir *dir) |
e9dbfae5 SR |
657 | { |
658 | mutex_lock(&event_mutex); | |
ae63b31e | 659 | __put_system_dir(dir); |
e9dbfae5 SR |
660 | mutex_unlock(&event_mutex); |
661 | } | |
662 | ||
7967b3e0 | 663 | static void remove_subsystem(struct trace_subsystem_dir *dir) |
f6a84bdc ON |
664 | { |
665 | if (!dir) | |
666 | return; | |
667 | ||
668 | if (!--dir->nr_events) { | |
8434dc93 | 669 | tracefs_remove_recursive(dir->entry); |
f6a84bdc ON |
670 | list_del(&dir->list); |
671 | __put_system_dir(dir); | |
672 | } | |
673 | } | |
674 | ||
7f1d2f82 | 675 | static void remove_event_file_dir(struct trace_event_file *file) |
f6a84bdc | 676 | { |
bf682c31 ON |
677 | struct dentry *dir = file->dir; |
678 | struct dentry *child; | |
679 | ||
680 | if (dir) { | |
681 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
946e51f2 | 682 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
7682c918 DH |
683 | if (d_really_is_positive(child)) /* probably unneeded */ |
684 | d_inode(child)->i_private = NULL; | |
bf682c31 ON |
685 | } |
686 | spin_unlock(&dir->d_lock); | |
687 | ||
8434dc93 | 688 | tracefs_remove_recursive(dir); |
bf682c31 ON |
689 | } |
690 | ||
f6a84bdc | 691 | list_del(&file->list); |
f6a84bdc | 692 | remove_subsystem(file->system); |
2448e349 | 693 | free_event_filter(file->filter); |
f6a84bdc ON |
694 | kmem_cache_free(file_cachep, file); |
695 | } | |
696 | ||
8f31bfe5 LZ |
697 | /* |
698 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
699 | */ | |
2a6c24af SRRH |
700 | static int |
701 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
702 | const char *sub, const char *event, int set) | |
b77e38aa | 703 | { |
7f1d2f82 | 704 | struct trace_event_file *file; |
2425bcb9 | 705 | struct trace_event_call *call; |
de7b2973 | 706 | const char *name; |
29f93943 | 707 | int ret = -EINVAL; |
8f31bfe5 | 708 | |
ae63b31e SR |
709 | list_for_each_entry(file, &tr->events, list) { |
710 | ||
711 | call = file->event_call; | |
687fcc4a | 712 | name = trace_event_name(call); |
8f31bfe5 | 713 | |
de7b2973 | 714 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
715 | continue; |
716 | ||
9b63776f SR |
717 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
718 | continue; | |
719 | ||
8f31bfe5 | 720 | if (match && |
de7b2973 | 721 | strcmp(match, name) != 0 && |
8f082018 | 722 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
723 | continue; |
724 | ||
8f082018 | 725 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
726 | continue; |
727 | ||
de7b2973 | 728 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
729 | continue; |
730 | ||
ae63b31e | 731 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
732 | |
733 | ret = 0; | |
734 | } | |
2a6c24af SRRH |
735 | |
736 | return ret; | |
737 | } | |
738 | ||
739 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
740 | const char *sub, const char *event, int set) | |
741 | { | |
742 | int ret; | |
743 | ||
744 | mutex_lock(&event_mutex); | |
745 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
746 | mutex_unlock(&event_mutex); |
747 | ||
748 | return ret; | |
749 | } | |
750 | ||
ae63b31e | 751 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 752 | { |
b628b3e6 | 753 | char *event = NULL, *sub = NULL, *match; |
84fce9db | 754 | int ret; |
b628b3e6 SR |
755 | |
756 | /* | |
757 | * The buf format can be <subsystem>:<event-name> | |
758 | * *:<event-name> means any event by that name. | |
759 | * :<event-name> is the same. | |
760 | * | |
761 | * <subsystem>:* means all events in that subsystem | |
762 | * <subsystem>: means the same. | |
763 | * | |
764 | * <name> (no ':') means all events in a subsystem with | |
765 | * the name <name> or any event that matches <name> | |
766 | */ | |
767 | ||
768 | match = strsep(&buf, ":"); | |
769 | if (buf) { | |
770 | sub = match; | |
771 | event = buf; | |
772 | match = NULL; | |
773 | ||
774 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
775 | sub = NULL; | |
776 | if (!strlen(event) || strcmp(event, "*") == 0) | |
777 | event = NULL; | |
778 | } | |
b77e38aa | 779 | |
84fce9db JK |
780 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
781 | ||
782 | /* Put back the colon to allow this to be called again */ | |
783 | if (buf) | |
784 | *(buf - 1) = ':'; | |
785 | ||
786 | return ret; | |
b77e38aa SR |
787 | } |
788 | ||
4671c794 SR |
789 | /** |
790 | * trace_set_clr_event - enable or disable an event | |
791 | * @system: system name to match (NULL for any system) | |
792 | * @event: event name to match (NULL for all events, within system) | |
793 | * @set: 1 to enable, 0 to disable | |
794 | * | |
795 | * This is a way for other parts of the kernel to enable or disable | |
796 | * event recording. | |
797 | * | |
798 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
799 | * registered events. | |
800 | */ | |
801 | int trace_set_clr_event(const char *system, const char *event, int set) | |
802 | { | |
ae63b31e SR |
803 | struct trace_array *tr = top_trace_array(); |
804 | ||
dc81e5e3 YY |
805 | if (!tr) |
806 | return -ENODEV; | |
807 | ||
ae63b31e | 808 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 809 | } |
56355b83 | 810 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 811 | |
b77e38aa SR |
812 | /* 128 should be much more than enough */ |
813 | #define EVENT_BUF_SIZE 127 | |
814 | ||
815 | static ssize_t | |
816 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
817 | size_t cnt, loff_t *ppos) | |
818 | { | |
48966364 | 819 | struct trace_parser parser; |
ae63b31e SR |
820 | struct seq_file *m = file->private_data; |
821 | struct trace_array *tr = m->private; | |
4ba7978e | 822 | ssize_t read, ret; |
b77e38aa | 823 | |
4ba7978e | 824 | if (!cnt) |
b77e38aa SR |
825 | return 0; |
826 | ||
1852fcce SR |
827 | ret = tracing_update_buffers(); |
828 | if (ret < 0) | |
829 | return ret; | |
830 | ||
48966364 | 831 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
832 | return -ENOMEM; |
833 | ||
48966364 | 834 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
835 | ||
4ba7978e | 836 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 837 | int set = 1; |
b77e38aa | 838 | |
48966364 | 839 | if (*parser.buffer == '!') |
b77e38aa | 840 | set = 0; |
b77e38aa | 841 | |
48966364 | 842 | parser.buffer[parser.idx] = 0; |
843 | ||
ae63b31e | 844 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 845 | if (ret) |
48966364 | 846 | goto out_put; |
b77e38aa | 847 | } |
b77e38aa SR |
848 | |
849 | ret = read; | |
850 | ||
48966364 | 851 | out_put: |
852 | trace_parser_put(&parser); | |
b77e38aa SR |
853 | |
854 | return ret; | |
855 | } | |
856 | ||
857 | static void * | |
858 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
859 | { | |
7f1d2f82 | 860 | struct trace_event_file *file = v; |
2425bcb9 | 861 | struct trace_event_call *call; |
ae63b31e | 862 | struct trace_array *tr = m->private; |
b77e38aa SR |
863 | |
864 | (*pos)++; | |
865 | ||
ae63b31e SR |
866 | list_for_each_entry_continue(file, &tr->events, list) { |
867 | call = file->event_call; | |
40e26815 SR |
868 | /* |
869 | * The ftrace subsystem is for showing formats only. | |
870 | * They can not be enabled or disabled via the event files. | |
871 | */ | |
d045437a SRRH |
872 | if (call->class && call->class->reg && |
873 | !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
ae63b31e | 874 | return file; |
40e26815 | 875 | } |
b77e38aa | 876 | |
30bd39cd | 877 | return NULL; |
b77e38aa SR |
878 | } |
879 | ||
880 | static void *t_start(struct seq_file *m, loff_t *pos) | |
881 | { | |
7f1d2f82 | 882 | struct trace_event_file *file; |
ae63b31e | 883 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
884 | loff_t l; |
885 | ||
20c8928a | 886 | mutex_lock(&event_mutex); |
e1c7e2a6 | 887 | |
7f1d2f82 | 888 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 889 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
890 | file = t_next(m, file, &l); |
891 | if (!file) | |
e1c7e2a6 LZ |
892 | break; |
893 | } | |
ae63b31e | 894 | return file; |
b77e38aa SR |
895 | } |
896 | ||
897 | static void * | |
898 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
899 | { | |
7f1d2f82 | 900 | struct trace_event_file *file = v; |
ae63b31e | 901 | struct trace_array *tr = m->private; |
b77e38aa SR |
902 | |
903 | (*pos)++; | |
904 | ||
ae63b31e | 905 | list_for_each_entry_continue(file, &tr->events, list) { |
5d6ad960 | 906 | if (file->flags & EVENT_FILE_FL_ENABLED) |
ae63b31e | 907 | return file; |
b77e38aa SR |
908 | } |
909 | ||
30bd39cd | 910 | return NULL; |
b77e38aa SR |
911 | } |
912 | ||
913 | static void *s_start(struct seq_file *m, loff_t *pos) | |
914 | { | |
7f1d2f82 | 915 | struct trace_event_file *file; |
ae63b31e | 916 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
917 | loff_t l; |
918 | ||
20c8928a | 919 | mutex_lock(&event_mutex); |
e1c7e2a6 | 920 | |
7f1d2f82 | 921 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 922 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
923 | file = s_next(m, file, &l); |
924 | if (!file) | |
e1c7e2a6 LZ |
925 | break; |
926 | } | |
ae63b31e | 927 | return file; |
b77e38aa SR |
928 | } |
929 | ||
930 | static int t_show(struct seq_file *m, void *v) | |
931 | { | |
7f1d2f82 | 932 | struct trace_event_file *file = v; |
2425bcb9 | 933 | struct trace_event_call *call = file->event_call; |
b77e38aa | 934 | |
8f082018 SR |
935 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
936 | seq_printf(m, "%s:", call->class->system); | |
687fcc4a | 937 | seq_printf(m, "%s\n", trace_event_name(call)); |
b77e38aa SR |
938 | |
939 | return 0; | |
940 | } | |
941 | ||
942 | static void t_stop(struct seq_file *m, void *p) | |
943 | { | |
20c8928a | 944 | mutex_unlock(&event_mutex); |
b77e38aa SR |
945 | } |
946 | ||
49090107 | 947 | static void *p_start(struct seq_file *m, loff_t *pos) |
fb662288 | 948 | __acquires(RCU) |
49090107 SRRH |
949 | { |
950 | struct trace_pid_list *pid_list; | |
951 | struct trace_array *tr = m->private; | |
952 | ||
953 | /* | |
954 | * Grab the mutex, to keep calls to p_next() having the same | |
955 | * tr->filtered_pids as p_start() has. | |
956 | * If we just passed the tr->filtered_pids around, then RCU would | |
957 | * have been enough, but doing that makes things more complex. | |
958 | */ | |
959 | mutex_lock(&event_mutex); | |
960 | rcu_read_lock_sched(); | |
961 | ||
962 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
963 | ||
964 | if (!pid_list || *pos >= pid_list->nr_pids) | |
965 | return NULL; | |
966 | ||
967 | return (void *)&pid_list->pids[*pos]; | |
968 | } | |
969 | ||
970 | static void p_stop(struct seq_file *m, void *p) | |
fb662288 | 971 | __releases(RCU) |
49090107 SRRH |
972 | { |
973 | rcu_read_unlock_sched(); | |
974 | mutex_unlock(&event_mutex); | |
975 | } | |
976 | ||
977 | static void * | |
978 | p_next(struct seq_file *m, void *v, loff_t *pos) | |
979 | { | |
980 | struct trace_array *tr = m->private; | |
981 | struct trace_pid_list *pid_list = rcu_dereference_sched(tr->filtered_pids); | |
982 | ||
983 | (*pos)++; | |
984 | ||
985 | if (*pos >= pid_list->nr_pids) | |
986 | return NULL; | |
987 | ||
988 | return (void *)&pid_list->pids[*pos]; | |
989 | } | |
990 | ||
991 | static int p_show(struct seq_file *m, void *v) | |
992 | { | |
993 | pid_t *pid = v; | |
994 | ||
995 | seq_printf(m, "%d\n", *pid); | |
996 | return 0; | |
997 | } | |
998 | ||
1473e441 SR |
999 | static ssize_t |
1000 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1001 | loff_t *ppos) | |
1002 | { | |
7f1d2f82 | 1003 | struct trace_event_file *file; |
bc6f6b08 | 1004 | unsigned long flags; |
a4390596 TZ |
1005 | char buf[4] = "0"; |
1006 | ||
bc6f6b08 ON |
1007 | mutex_lock(&event_mutex); |
1008 | file = event_file_data(filp); | |
1009 | if (likely(file)) | |
1010 | flags = file->flags; | |
1011 | mutex_unlock(&event_mutex); | |
1012 | ||
1013 | if (!file) | |
1014 | return -ENODEV; | |
1015 | ||
5d6ad960 SRRH |
1016 | if (flags & EVENT_FILE_FL_ENABLED && |
1017 | !(flags & EVENT_FILE_FL_SOFT_DISABLED)) | |
a4390596 TZ |
1018 | strcpy(buf, "1"); |
1019 | ||
5d6ad960 SRRH |
1020 | if (flags & EVENT_FILE_FL_SOFT_DISABLED || |
1021 | flags & EVENT_FILE_FL_SOFT_MODE) | |
a4390596 TZ |
1022 | strcat(buf, "*"); |
1023 | ||
1024 | strcat(buf, "\n"); | |
1473e441 | 1025 | |
417944c4 | 1026 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
1027 | } |
1028 | ||
1029 | static ssize_t | |
1030 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1031 | loff_t *ppos) | |
1032 | { | |
7f1d2f82 | 1033 | struct trace_event_file *file; |
1473e441 SR |
1034 | unsigned long val; |
1035 | int ret; | |
1036 | ||
22fe9b54 PH |
1037 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1038 | if (ret) | |
1473e441 SR |
1039 | return ret; |
1040 | ||
1852fcce SR |
1041 | ret = tracing_update_buffers(); |
1042 | if (ret < 0) | |
1043 | return ret; | |
1044 | ||
1473e441 SR |
1045 | switch (val) { |
1046 | case 0: | |
1473e441 | 1047 | case 1: |
bc6f6b08 | 1048 | ret = -ENODEV; |
11a241a3 | 1049 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
1050 | file = event_file_data(filp); |
1051 | if (likely(file)) | |
1052 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 1053 | mutex_unlock(&event_mutex); |
1473e441 SR |
1054 | break; |
1055 | ||
1056 | default: | |
1057 | return -EINVAL; | |
1058 | } | |
1059 | ||
1060 | *ppos += cnt; | |
1061 | ||
3b8e4273 | 1062 | return ret ? ret : cnt; |
1473e441 SR |
1063 | } |
1064 | ||
8ae79a13 SR |
1065 | static ssize_t |
1066 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1067 | loff_t *ppos) | |
1068 | { | |
c142b15d | 1069 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
7967b3e0 | 1070 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1071 | struct event_subsystem *system = dir->subsystem; |
2425bcb9 | 1072 | struct trace_event_call *call; |
7f1d2f82 | 1073 | struct trace_event_file *file; |
ae63b31e | 1074 | struct trace_array *tr = dir->tr; |
8ae79a13 | 1075 | char buf[2]; |
c142b15d | 1076 | int set = 0; |
8ae79a13 SR |
1077 | int ret; |
1078 | ||
8ae79a13 | 1079 | mutex_lock(&event_mutex); |
ae63b31e SR |
1080 | list_for_each_entry(file, &tr->events, list) { |
1081 | call = file->event_call; | |
687fcc4a | 1082 | if (!trace_event_name(call) || !call->class || !call->class->reg) |
8ae79a13 SR |
1083 | continue; |
1084 | ||
40ee4dff | 1085 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
1086 | continue; |
1087 | ||
1088 | /* | |
1089 | * We need to find out if all the events are set | |
1090 | * or if all events or cleared, or if we have | |
1091 | * a mixture. | |
1092 | */ | |
5d6ad960 | 1093 | set |= (1 << !!(file->flags & EVENT_FILE_FL_ENABLED)); |
c142b15d | 1094 | |
8ae79a13 SR |
1095 | /* |
1096 | * If we have a mixture, no need to look further. | |
1097 | */ | |
c142b15d | 1098 | if (set == 3) |
8ae79a13 SR |
1099 | break; |
1100 | } | |
1101 | mutex_unlock(&event_mutex); | |
1102 | ||
c142b15d | 1103 | buf[0] = set_to_char[set]; |
8ae79a13 | 1104 | buf[1] = '\n'; |
8ae79a13 SR |
1105 | |
1106 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
1107 | ||
1108 | return ret; | |
1109 | } | |
1110 | ||
1111 | static ssize_t | |
1112 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1113 | loff_t *ppos) | |
1114 | { | |
7967b3e0 | 1115 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1116 | struct event_subsystem *system = dir->subsystem; |
40ee4dff | 1117 | const char *name = NULL; |
8ae79a13 | 1118 | unsigned long val; |
8ae79a13 SR |
1119 | ssize_t ret; |
1120 | ||
22fe9b54 PH |
1121 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1122 | if (ret) | |
8ae79a13 SR |
1123 | return ret; |
1124 | ||
1125 | ret = tracing_update_buffers(); | |
1126 | if (ret < 0) | |
1127 | return ret; | |
1128 | ||
8f31bfe5 | 1129 | if (val != 0 && val != 1) |
8ae79a13 | 1130 | return -EINVAL; |
8ae79a13 | 1131 | |
40ee4dff SR |
1132 | /* |
1133 | * Opening of "enable" adds a ref count to system, | |
1134 | * so the name is safe to use. | |
1135 | */ | |
1136 | if (system) | |
1137 | name = system->name; | |
1138 | ||
ae63b31e | 1139 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 1140 | if (ret) |
8f31bfe5 | 1141 | goto out; |
8ae79a13 SR |
1142 | |
1143 | ret = cnt; | |
1144 | ||
8f31bfe5 | 1145 | out: |
8ae79a13 SR |
1146 | *ppos += cnt; |
1147 | ||
1148 | return ret; | |
1149 | } | |
1150 | ||
2a37a3df SR |
1151 | enum { |
1152 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
1153 | FORMAT_FIELD_SEPERATOR = 2, |
1154 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
1155 | }; |
1156 | ||
1157 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 1158 | { |
2425bcb9 | 1159 | struct trace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
1160 | struct list_head *common_head = &ftrace_common_fields; |
1161 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 1162 | struct list_head *node = v; |
981d081e | 1163 | |
2a37a3df | 1164 | (*pos)++; |
5a65e956 | 1165 | |
2a37a3df SR |
1166 | switch ((unsigned long)v) { |
1167 | case FORMAT_HEADER: | |
7710b639 ON |
1168 | node = common_head; |
1169 | break; | |
5a65e956 | 1170 | |
86397dc3 | 1171 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
1172 | node = head; |
1173 | break; | |
5a65e956 | 1174 | |
2a37a3df SR |
1175 | case FORMAT_PRINTFMT: |
1176 | /* all done */ | |
1177 | return NULL; | |
5a65e956 LJ |
1178 | } |
1179 | ||
7710b639 ON |
1180 | node = node->prev; |
1181 | if (node == common_head) | |
86397dc3 | 1182 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 1183 | else if (node == head) |
2a37a3df | 1184 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
1185 | else |
1186 | return node; | |
2a37a3df SR |
1187 | } |
1188 | ||
1189 | static int f_show(struct seq_file *m, void *v) | |
1190 | { | |
2425bcb9 | 1191 | struct trace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
1192 | struct ftrace_event_field *field; |
1193 | const char *array_descriptor; | |
1194 | ||
1195 | switch ((unsigned long)v) { | |
1196 | case FORMAT_HEADER: | |
687fcc4a | 1197 | seq_printf(m, "name: %s\n", trace_event_name(call)); |
2a37a3df | 1198 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 1199 | seq_puts(m, "format:\n"); |
8728fe50 | 1200 | return 0; |
5a65e956 | 1201 | |
86397dc3 LZ |
1202 | case FORMAT_FIELD_SEPERATOR: |
1203 | seq_putc(m, '\n'); | |
1204 | return 0; | |
1205 | ||
2a37a3df SR |
1206 | case FORMAT_PRINTFMT: |
1207 | seq_printf(m, "\nprint fmt: %s\n", | |
1208 | call->print_fmt); | |
1209 | return 0; | |
981d081e | 1210 | } |
8728fe50 | 1211 | |
7710b639 | 1212 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
1213 | /* |
1214 | * Smartly shows the array type(except dynamic array). | |
1215 | * Normal: | |
1216 | * field:TYPE VAR | |
1217 | * If TYPE := TYPE[LEN], it is shown: | |
1218 | * field:TYPE VAR[LEN] | |
1219 | */ | |
1220 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 1221 | |
2a37a3df SR |
1222 | if (!strncmp(field->type, "__data_loc", 10)) |
1223 | array_descriptor = NULL; | |
8728fe50 | 1224 | |
2a37a3df SR |
1225 | if (!array_descriptor) |
1226 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1227 | field->type, field->name, field->offset, | |
1228 | field->size, !!field->is_signed); | |
1229 | else | |
1230 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1231 | (int)(array_descriptor - field->type), | |
1232 | field->type, field->name, | |
1233 | array_descriptor, field->offset, | |
1234 | field->size, !!field->is_signed); | |
8728fe50 | 1235 | |
2a37a3df SR |
1236 | return 0; |
1237 | } | |
5a65e956 | 1238 | |
7710b639 ON |
1239 | static void *f_start(struct seq_file *m, loff_t *pos) |
1240 | { | |
1241 | void *p = (void *)FORMAT_HEADER; | |
1242 | loff_t l = 0; | |
1243 | ||
c5a44a12 ON |
1244 | /* ->stop() is called even if ->start() fails */ |
1245 | mutex_lock(&event_mutex); | |
1246 | if (!event_file_data(m->private)) | |
1247 | return ERR_PTR(-ENODEV); | |
1248 | ||
7710b639 ON |
1249 | while (l < *pos && p) |
1250 | p = f_next(m, p, &l); | |
1251 | ||
1252 | return p; | |
1253 | } | |
1254 | ||
2a37a3df SR |
1255 | static void f_stop(struct seq_file *m, void *p) |
1256 | { | |
c5a44a12 | 1257 | mutex_unlock(&event_mutex); |
2a37a3df | 1258 | } |
981d081e | 1259 | |
2a37a3df SR |
1260 | static const struct seq_operations trace_format_seq_ops = { |
1261 | .start = f_start, | |
1262 | .next = f_next, | |
1263 | .stop = f_stop, | |
1264 | .show = f_show, | |
1265 | }; | |
1266 | ||
1267 | static int trace_format_open(struct inode *inode, struct file *file) | |
1268 | { | |
2a37a3df SR |
1269 | struct seq_file *m; |
1270 | int ret; | |
1271 | ||
1272 | ret = seq_open(file, &trace_format_seq_ops); | |
1273 | if (ret < 0) | |
1274 | return ret; | |
1275 | ||
1276 | m = file->private_data; | |
c5a44a12 | 1277 | m->private = file; |
2a37a3df SR |
1278 | |
1279 | return 0; | |
981d081e SR |
1280 | } |
1281 | ||
23725aee PZ |
1282 | static ssize_t |
1283 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1284 | { | |
1a11126b | 1285 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1286 | char buf[32]; |
1287 | int len; | |
23725aee PZ |
1288 | |
1289 | if (*ppos) | |
1290 | return 0; | |
1291 | ||
1a11126b ON |
1292 | if (unlikely(!id)) |
1293 | return -ENODEV; | |
1294 | ||
1295 | len = sprintf(buf, "%d\n", id); | |
1296 | ||
cd458ba9 | 1297 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1298 | } |
1299 | ||
7ce7e424 TZ |
1300 | static ssize_t |
1301 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1302 | loff_t *ppos) | |
1303 | { | |
7f1d2f82 | 1304 | struct trace_event_file *file; |
7ce7e424 | 1305 | struct trace_seq *s; |
e2912b09 | 1306 | int r = -ENODEV; |
7ce7e424 TZ |
1307 | |
1308 | if (*ppos) | |
1309 | return 0; | |
1310 | ||
1311 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1312 | |
7ce7e424 TZ |
1313 | if (!s) |
1314 | return -ENOMEM; | |
1315 | ||
1316 | trace_seq_init(s); | |
1317 | ||
e2912b09 | 1318 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1319 | file = event_file_data(filp); |
1320 | if (file) | |
1321 | print_event_filter(file, s); | |
e2912b09 ON |
1322 | mutex_unlock(&event_mutex); |
1323 | ||
f306cc82 | 1324 | if (file) |
5ac48378 SRRH |
1325 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1326 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1327 | |
1328 | kfree(s); | |
1329 | ||
1330 | return r; | |
1331 | } | |
1332 | ||
1333 | static ssize_t | |
1334 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1335 | loff_t *ppos) | |
1336 | { | |
7f1d2f82 | 1337 | struct trace_event_file *file; |
8b372562 | 1338 | char *buf; |
e2912b09 | 1339 | int err = -ENODEV; |
7ce7e424 | 1340 | |
8b372562 | 1341 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1342 | return -EINVAL; |
1343 | ||
70f6cbb6 AV |
1344 | buf = memdup_user_nul(ubuf, cnt); |
1345 | if (IS_ERR(buf)) | |
1346 | return PTR_ERR(buf); | |
7ce7e424 | 1347 | |
e2912b09 | 1348 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1349 | file = event_file_data(filp); |
1350 | if (file) | |
1351 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1352 | mutex_unlock(&event_mutex); |
1353 | ||
70f6cbb6 | 1354 | kfree(buf); |
8b372562 | 1355 | if (err < 0) |
44e9c8b7 | 1356 | return err; |
0a19e53c | 1357 | |
7ce7e424 TZ |
1358 | *ppos += cnt; |
1359 | ||
1360 | return cnt; | |
1361 | } | |
1362 | ||
e9dbfae5 SR |
1363 | static LIST_HEAD(event_subsystems); |
1364 | ||
1365 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1366 | { | |
1367 | struct event_subsystem *system = NULL; | |
7967b3e0 | 1368 | struct trace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
ae63b31e | 1369 | struct trace_array *tr; |
e9dbfae5 SR |
1370 | int ret; |
1371 | ||
d6d3523c GB |
1372 | if (tracing_is_disabled()) |
1373 | return -ENODEV; | |
1374 | ||
e9dbfae5 | 1375 | /* Make sure the system still exists */ |
a8227415 | 1376 | mutex_lock(&trace_types_lock); |
e9dbfae5 | 1377 | mutex_lock(&event_mutex); |
ae63b31e SR |
1378 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1379 | list_for_each_entry(dir, &tr->systems, list) { | |
1380 | if (dir == inode->i_private) { | |
1381 | /* Don't open systems with no events */ | |
1382 | if (dir->nr_events) { | |
1383 | __get_system_dir(dir); | |
1384 | system = dir->subsystem; | |
1385 | } | |
1386 | goto exit_loop; | |
e9dbfae5 | 1387 | } |
e9dbfae5 SR |
1388 | } |
1389 | } | |
ae63b31e | 1390 | exit_loop: |
e9dbfae5 | 1391 | mutex_unlock(&event_mutex); |
a8227415 | 1392 | mutex_unlock(&trace_types_lock); |
e9dbfae5 | 1393 | |
ae63b31e | 1394 | if (!system) |
e9dbfae5 SR |
1395 | return -ENODEV; |
1396 | ||
ae63b31e SR |
1397 | /* Some versions of gcc think dir can be uninitialized here */ |
1398 | WARN_ON(!dir); | |
1399 | ||
8e2e2fa4 SRRH |
1400 | /* Still need to increment the ref count of the system */ |
1401 | if (trace_array_get(tr) < 0) { | |
1402 | put_system(dir); | |
1403 | return -ENODEV; | |
1404 | } | |
1405 | ||
e9dbfae5 | 1406 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1407 | if (ret < 0) { |
1408 | trace_array_put(tr); | |
ae63b31e | 1409 | put_system(dir); |
8e2e2fa4 | 1410 | } |
ae63b31e SR |
1411 | |
1412 | return ret; | |
1413 | } | |
1414 | ||
1415 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1416 | { | |
7967b3e0 | 1417 | struct trace_subsystem_dir *dir; |
ae63b31e SR |
1418 | struct trace_array *tr = inode->i_private; |
1419 | int ret; | |
1420 | ||
d6d3523c GB |
1421 | if (tracing_is_disabled()) |
1422 | return -ENODEV; | |
1423 | ||
8e2e2fa4 SRRH |
1424 | if (trace_array_get(tr) < 0) |
1425 | return -ENODEV; | |
1426 | ||
ae63b31e SR |
1427 | /* Make a temporary dir that has no system but points to tr */ |
1428 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
8e2e2fa4 SRRH |
1429 | if (!dir) { |
1430 | trace_array_put(tr); | |
ae63b31e | 1431 | return -ENOMEM; |
8e2e2fa4 | 1432 | } |
ae63b31e SR |
1433 | |
1434 | dir->tr = tr; | |
1435 | ||
1436 | ret = tracing_open_generic(inode, filp); | |
8e2e2fa4 SRRH |
1437 | if (ret < 0) { |
1438 | trace_array_put(tr); | |
ae63b31e | 1439 | kfree(dir); |
d6d3523c | 1440 | return ret; |
8e2e2fa4 | 1441 | } |
ae63b31e SR |
1442 | |
1443 | filp->private_data = dir; | |
e9dbfae5 | 1444 | |
d6d3523c | 1445 | return 0; |
e9dbfae5 SR |
1446 | } |
1447 | ||
1448 | static int subsystem_release(struct inode *inode, struct file *file) | |
1449 | { | |
7967b3e0 | 1450 | struct trace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1451 | |
8e2e2fa4 SRRH |
1452 | trace_array_put(dir->tr); |
1453 | ||
ae63b31e SR |
1454 | /* |
1455 | * If dir->subsystem is NULL, then this is a temporary | |
1456 | * descriptor that was made for a trace_array to enable | |
1457 | * all subsystems. | |
1458 | */ | |
1459 | if (dir->subsystem) | |
1460 | put_system(dir); | |
1461 | else | |
1462 | kfree(dir); | |
e9dbfae5 SR |
1463 | |
1464 | return 0; | |
1465 | } | |
1466 | ||
cfb180f3 TZ |
1467 | static ssize_t |
1468 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1469 | loff_t *ppos) | |
1470 | { | |
7967b3e0 | 1471 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1472 | struct event_subsystem *system = dir->subsystem; |
cfb180f3 TZ |
1473 | struct trace_seq *s; |
1474 | int r; | |
1475 | ||
1476 | if (*ppos) | |
1477 | return 0; | |
1478 | ||
1479 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1480 | if (!s) | |
1481 | return -ENOMEM; | |
1482 | ||
1483 | trace_seq_init(s); | |
1484 | ||
8b372562 | 1485 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1486 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1487 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1488 | |
1489 | kfree(s); | |
1490 | ||
1491 | return r; | |
1492 | } | |
1493 | ||
1494 | static ssize_t | |
1495 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1496 | loff_t *ppos) | |
1497 | { | |
7967b3e0 | 1498 | struct trace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1499 | char *buf; |
cfb180f3 TZ |
1500 | int err; |
1501 | ||
8b372562 | 1502 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1503 | return -EINVAL; |
1504 | ||
70f6cbb6 AV |
1505 | buf = memdup_user_nul(ubuf, cnt); |
1506 | if (IS_ERR(buf)) | |
1507 | return PTR_ERR(buf); | |
cfb180f3 | 1508 | |
ae63b31e | 1509 | err = apply_subsystem_event_filter(dir, buf); |
70f6cbb6 | 1510 | kfree(buf); |
8b372562 | 1511 | if (err < 0) |
44e9c8b7 | 1512 | return err; |
cfb180f3 TZ |
1513 | |
1514 | *ppos += cnt; | |
1515 | ||
1516 | return cnt; | |
1517 | } | |
1518 | ||
d1b182a8 SR |
1519 | static ssize_t |
1520 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1521 | { | |
1522 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1523 | struct trace_seq *s; | |
1524 | int r; | |
1525 | ||
1526 | if (*ppos) | |
1527 | return 0; | |
1528 | ||
1529 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1530 | if (!s) | |
1531 | return -ENOMEM; | |
1532 | ||
1533 | trace_seq_init(s); | |
1534 | ||
1535 | func(s); | |
5ac48378 SRRH |
1536 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1537 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1538 | |
1539 | kfree(s); | |
1540 | ||
1541 | return r; | |
1542 | } | |
1543 | ||
49090107 SRRH |
1544 | static int max_pids(struct trace_pid_list *pid_list) |
1545 | { | |
1546 | return (PAGE_SIZE << pid_list->order) / sizeof(pid_t); | |
1547 | } | |
1548 | ||
8ca532ad SRRH |
1549 | static void ignore_task_cpu(void *data) |
1550 | { | |
1551 | struct trace_array *tr = data; | |
1552 | struct trace_pid_list *pid_list; | |
1553 | ||
1554 | /* | |
1555 | * This function is called by on_each_cpu() while the | |
1556 | * event_mutex is held. | |
1557 | */ | |
1558 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
1559 | mutex_is_locked(&event_mutex)); | |
1560 | ||
1561 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
1562 | check_ignore_pid(pid_list, current)); | |
1563 | } | |
1564 | ||
49090107 | 1565 | static ssize_t |
3fdaf80f | 1566 | ftrace_event_pid_write(struct file *filp, const char __user *ubuf, |
49090107 SRRH |
1567 | size_t cnt, loff_t *ppos) |
1568 | { | |
3fdaf80f | 1569 | struct seq_file *m = filp->private_data; |
49090107 SRRH |
1570 | struct trace_array *tr = m->private; |
1571 | struct trace_pid_list *filtered_pids = NULL; | |
1572 | struct trace_pid_list *pid_list = NULL; | |
3fdaf80f | 1573 | struct trace_event_file *file; |
49090107 SRRH |
1574 | struct trace_parser parser; |
1575 | unsigned long val; | |
1576 | loff_t this_pos; | |
1577 | ssize_t read = 0; | |
1578 | ssize_t ret = 0; | |
1579 | pid_t pid; | |
1580 | int i; | |
1581 | ||
1582 | if (!cnt) | |
1583 | return 0; | |
1584 | ||
1585 | ret = tracing_update_buffers(); | |
1586 | if (ret < 0) | |
1587 | return ret; | |
1588 | ||
1589 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) | |
1590 | return -ENOMEM; | |
1591 | ||
1592 | mutex_lock(&event_mutex); | |
1593 | /* | |
1594 | * Load as many pids into the array before doing a | |
1595 | * swap from the tr->filtered_pids to the new list. | |
1596 | */ | |
1597 | while (cnt > 0) { | |
1598 | ||
1599 | this_pos = 0; | |
1600 | ||
1601 | ret = trace_get_user(&parser, ubuf, cnt, &this_pos); | |
1602 | if (ret < 0 || !trace_parser_loaded(&parser)) | |
1603 | break; | |
1604 | ||
1605 | read += ret; | |
1606 | ubuf += ret; | |
1607 | cnt -= ret; | |
1608 | ||
1609 | parser.buffer[parser.idx] = 0; | |
1610 | ||
1611 | ret = -EINVAL; | |
1612 | if (kstrtoul(parser.buffer, 0, &val)) | |
1613 | break; | |
1614 | if (val > INT_MAX) | |
1615 | break; | |
1616 | ||
1617 | pid = (pid_t)val; | |
1618 | ||
1619 | ret = -ENOMEM; | |
1620 | if (!pid_list) { | |
1621 | pid_list = kmalloc(sizeof(*pid_list), GFP_KERNEL); | |
1622 | if (!pid_list) | |
1623 | break; | |
1624 | ||
1625 | filtered_pids = rcu_dereference_protected(tr->filtered_pids, | |
1626 | lockdep_is_held(&event_mutex)); | |
1627 | if (filtered_pids) | |
1628 | pid_list->order = filtered_pids->order; | |
1629 | else | |
1630 | pid_list->order = 0; | |
1631 | ||
1632 | pid_list->pids = (void *)__get_free_pages(GFP_KERNEL, | |
1633 | pid_list->order); | |
1634 | if (!pid_list->pids) | |
1635 | break; | |
1636 | ||
1637 | if (filtered_pids) { | |
1638 | pid_list->nr_pids = filtered_pids->nr_pids; | |
1639 | memcpy(pid_list->pids, filtered_pids->pids, | |
1640 | pid_list->nr_pids * sizeof(pid_t)); | |
1641 | } else | |
1642 | pid_list->nr_pids = 0; | |
1643 | } | |
1644 | ||
1645 | if (pid_list->nr_pids >= max_pids(pid_list)) { | |
1646 | pid_t *pid_page; | |
1647 | ||
1648 | pid_page = (void *)__get_free_pages(GFP_KERNEL, | |
1649 | pid_list->order + 1); | |
1650 | if (!pid_page) | |
1651 | break; | |
1652 | memcpy(pid_page, pid_list->pids, | |
1653 | pid_list->nr_pids * sizeof(pid_t)); | |
1654 | free_pages((unsigned long)pid_list->pids, pid_list->order); | |
1655 | ||
1656 | pid_list->order++; | |
1657 | pid_list->pids = pid_page; | |
1658 | } | |
1659 | ||
1660 | pid_list->pids[pid_list->nr_pids++] = pid; | |
1661 | trace_parser_clear(&parser); | |
1662 | ret = 0; | |
1663 | } | |
1664 | trace_parser_put(&parser); | |
1665 | ||
1666 | if (ret < 0) { | |
1667 | if (pid_list) | |
1668 | free_pages((unsigned long)pid_list->pids, pid_list->order); | |
1669 | kfree(pid_list); | |
1670 | mutex_unlock(&event_mutex); | |
1671 | return ret; | |
1672 | } | |
1673 | ||
1674 | if (!pid_list) { | |
1675 | mutex_unlock(&event_mutex); | |
1676 | return ret; | |
1677 | } | |
1678 | ||
1679 | sort(pid_list->pids, pid_list->nr_pids, sizeof(pid_t), cmp_pid, NULL); | |
1680 | ||
1681 | /* Remove duplicates */ | |
1682 | for (i = 1; i < pid_list->nr_pids; i++) { | |
1683 | int start = i; | |
1684 | ||
1685 | while (i < pid_list->nr_pids && | |
1686 | pid_list->pids[i - 1] == pid_list->pids[i]) | |
1687 | i++; | |
1688 | ||
1689 | if (start != i) { | |
1690 | if (i < pid_list->nr_pids) { | |
1691 | memmove(&pid_list->pids[start], &pid_list->pids[i], | |
1692 | (pid_list->nr_pids - i) * sizeof(pid_t)); | |
1693 | pid_list->nr_pids -= i - start; | |
1694 | i = start; | |
1695 | } else | |
1696 | pid_list->nr_pids = start; | |
1697 | } | |
1698 | } | |
1699 | ||
1700 | rcu_assign_pointer(tr->filtered_pids, pid_list); | |
1701 | ||
3fdaf80f SRRH |
1702 | list_for_each_entry(file, &tr->events, list) { |
1703 | set_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
1704 | } | |
49090107 SRRH |
1705 | |
1706 | if (filtered_pids) { | |
1707 | synchronize_sched(); | |
1708 | ||
1709 | free_pages((unsigned long)filtered_pids->pids, filtered_pids->order); | |
1710 | kfree(filtered_pids); | |
3fdaf80f SRRH |
1711 | } else { |
1712 | /* | |
1713 | * Register a probe that is called before all other probes | |
1714 | * to set ignore_pid if next or prev do not match. | |
1715 | * Register a probe this is called after all other probes | |
1716 | * to only keep ignore_pid set if next pid matches. | |
1717 | */ | |
1718 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_pre, | |
1719 | tr, INT_MAX); | |
1720 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_post, | |
1721 | tr, 0); | |
1722 | ||
1723 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, | |
1724 | tr, INT_MAX); | |
1725 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, | |
1726 | tr, 0); | |
0f72e37e SRRH |
1727 | |
1728 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, | |
1729 | tr, INT_MAX); | |
1730 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, | |
1731 | tr, 0); | |
1732 | ||
1733 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_pre, | |
1734 | tr, INT_MAX); | |
1735 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_post, | |
1736 | tr, 0); | |
49090107 SRRH |
1737 | } |
1738 | ||
799fd44c SRRH |
1739 | /* |
1740 | * Ignoring of pids is done at task switch. But we have to | |
1741 | * check for those tasks that are currently running. | |
1742 | * Always do this in case a pid was appended or removed. | |
1743 | */ | |
1744 | on_each_cpu(ignore_task_cpu, tr, 1); | |
1745 | ||
3fdaf80f SRRH |
1746 | mutex_unlock(&event_mutex); |
1747 | ||
49090107 SRRH |
1748 | ret = read; |
1749 | *ppos += read; | |
1750 | ||
1751 | return ret; | |
1752 | } | |
1753 | ||
15075cac SR |
1754 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1755 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
49090107 | 1756 | static int ftrace_event_set_pid_open(struct inode *inode, struct file *file); |
f77d09a3 | 1757 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1758 | |
b77e38aa SR |
1759 | static const struct seq_operations show_event_seq_ops = { |
1760 | .start = t_start, | |
1761 | .next = t_next, | |
1762 | .show = t_show, | |
1763 | .stop = t_stop, | |
1764 | }; | |
1765 | ||
1766 | static const struct seq_operations show_set_event_seq_ops = { | |
1767 | .start = s_start, | |
1768 | .next = s_next, | |
1769 | .show = t_show, | |
1770 | .stop = t_stop, | |
1771 | }; | |
1772 | ||
49090107 SRRH |
1773 | static const struct seq_operations show_set_pid_seq_ops = { |
1774 | .start = p_start, | |
1775 | .next = p_next, | |
1776 | .show = p_show, | |
1777 | .stop = p_stop, | |
1778 | }; | |
1779 | ||
2314c4ae | 1780 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1781 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1782 | .read = seq_read, |
1783 | .llseek = seq_lseek, | |
1784 | .release = seq_release, | |
1785 | }; | |
1786 | ||
b77e38aa | 1787 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1788 | .open = ftrace_event_set_open, |
b77e38aa SR |
1789 | .read = seq_read, |
1790 | .write = ftrace_event_write, | |
1791 | .llseek = seq_lseek, | |
f77d09a3 | 1792 | .release = ftrace_event_release, |
b77e38aa SR |
1793 | }; |
1794 | ||
49090107 SRRH |
1795 | static const struct file_operations ftrace_set_event_pid_fops = { |
1796 | .open = ftrace_event_set_pid_open, | |
1797 | .read = seq_read, | |
1798 | .write = ftrace_event_pid_write, | |
1799 | .llseek = seq_lseek, | |
1800 | .release = ftrace_event_release, | |
1801 | }; | |
1802 | ||
1473e441 | 1803 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 1804 | .open = tracing_open_generic, |
1473e441 SR |
1805 | .read = event_enable_read, |
1806 | .write = event_enable_write, | |
6038f373 | 1807 | .llseek = default_llseek, |
1473e441 SR |
1808 | }; |
1809 | ||
981d081e | 1810 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1811 | .open = trace_format_open, |
1812 | .read = seq_read, | |
1813 | .llseek = seq_lseek, | |
1814 | .release = seq_release, | |
981d081e SR |
1815 | }; |
1816 | ||
23725aee | 1817 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1818 | .read = event_id_read, |
6038f373 | 1819 | .llseek = default_llseek, |
23725aee PZ |
1820 | }; |
1821 | ||
7ce7e424 TZ |
1822 | static const struct file_operations ftrace_event_filter_fops = { |
1823 | .open = tracing_open_generic, | |
1824 | .read = event_filter_read, | |
1825 | .write = event_filter_write, | |
6038f373 | 1826 | .llseek = default_llseek, |
7ce7e424 TZ |
1827 | }; |
1828 | ||
cfb180f3 | 1829 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1830 | .open = subsystem_open, |
cfb180f3 TZ |
1831 | .read = subsystem_filter_read, |
1832 | .write = subsystem_filter_write, | |
6038f373 | 1833 | .llseek = default_llseek, |
e9dbfae5 | 1834 | .release = subsystem_release, |
cfb180f3 TZ |
1835 | }; |
1836 | ||
8ae79a13 | 1837 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1838 | .open = subsystem_open, |
8ae79a13 SR |
1839 | .read = system_enable_read, |
1840 | .write = system_enable_write, | |
6038f373 | 1841 | .llseek = default_llseek, |
40ee4dff | 1842 | .release = subsystem_release, |
8ae79a13 SR |
1843 | }; |
1844 | ||
ae63b31e SR |
1845 | static const struct file_operations ftrace_tr_enable_fops = { |
1846 | .open = system_tr_open, | |
1847 | .read = system_enable_read, | |
1848 | .write = system_enable_write, | |
1849 | .llseek = default_llseek, | |
1850 | .release = subsystem_release, | |
1851 | }; | |
1852 | ||
d1b182a8 SR |
1853 | static const struct file_operations ftrace_show_header_fops = { |
1854 | .open = tracing_open_generic, | |
1855 | .read = show_header, | |
6038f373 | 1856 | .llseek = default_llseek, |
d1b182a8 SR |
1857 | }; |
1858 | ||
ae63b31e SR |
1859 | static int |
1860 | ftrace_event_open(struct inode *inode, struct file *file, | |
1861 | const struct seq_operations *seq_ops) | |
1473e441 | 1862 | { |
ae63b31e SR |
1863 | struct seq_file *m; |
1864 | int ret; | |
1473e441 | 1865 | |
ae63b31e SR |
1866 | ret = seq_open(file, seq_ops); |
1867 | if (ret < 0) | |
1868 | return ret; | |
1869 | m = file->private_data; | |
1870 | /* copy tr over to seq ops */ | |
1871 | m->private = inode->i_private; | |
1473e441 | 1872 | |
ae63b31e | 1873 | return ret; |
1473e441 SR |
1874 | } |
1875 | ||
f77d09a3 AL |
1876 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1877 | { | |
1878 | struct trace_array *tr = inode->i_private; | |
1879 | ||
1880 | trace_array_put(tr); | |
1881 | ||
1882 | return seq_release(inode, file); | |
1883 | } | |
1884 | ||
15075cac SR |
1885 | static int |
1886 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1887 | { | |
1888 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1889 | ||
ae63b31e | 1890 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1891 | } |
1892 | ||
1893 | static int | |
1894 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1895 | { | |
1896 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1897 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
1898 | int ret; |
1899 | ||
1900 | if (trace_array_get(tr) < 0) | |
1901 | return -ENODEV; | |
15075cac SR |
1902 | |
1903 | if ((file->f_mode & FMODE_WRITE) && | |
1904 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1905 | ftrace_clear_events(tr); |
15075cac | 1906 | |
f77d09a3 AL |
1907 | ret = ftrace_event_open(inode, file, seq_ops); |
1908 | if (ret < 0) | |
1909 | trace_array_put(tr); | |
1910 | return ret; | |
ae63b31e SR |
1911 | } |
1912 | ||
49090107 SRRH |
1913 | static int |
1914 | ftrace_event_set_pid_open(struct inode *inode, struct file *file) | |
1915 | { | |
1916 | const struct seq_operations *seq_ops = &show_set_pid_seq_ops; | |
1917 | struct trace_array *tr = inode->i_private; | |
1918 | int ret; | |
1919 | ||
1920 | if (trace_array_get(tr) < 0) | |
1921 | return -ENODEV; | |
1922 | ||
1923 | if ((file->f_mode & FMODE_WRITE) && | |
1924 | (file->f_flags & O_TRUNC)) | |
1925 | ftrace_clear_event_pids(tr); | |
1926 | ||
1927 | ret = ftrace_event_open(inode, file, seq_ops); | |
1928 | if (ret < 0) | |
1929 | trace_array_put(tr); | |
1930 | return ret; | |
1931 | } | |
1932 | ||
ae63b31e SR |
1933 | static struct event_subsystem * |
1934 | create_new_subsystem(const char *name) | |
1935 | { | |
1936 | struct event_subsystem *system; | |
1937 | ||
1938 | /* need to create new entry */ | |
1939 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1940 | if (!system) | |
1941 | return NULL; | |
1942 | ||
1943 | system->ref_count = 1; | |
6e94a780 SR |
1944 | |
1945 | /* Only allocate if dynamic (kprobes and modules) */ | |
79ac6ef5 RV |
1946 | system->name = kstrdup_const(name, GFP_KERNEL); |
1947 | if (!system->name) | |
1948 | goto out_free; | |
ae63b31e SR |
1949 | |
1950 | system->filter = NULL; | |
1951 | ||
1952 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1953 | if (!system->filter) | |
1954 | goto out_free; | |
1955 | ||
1956 | list_add(&system->list, &event_subsystems); | |
1957 | ||
1958 | return system; | |
1959 | ||
1960 | out_free: | |
79ac6ef5 | 1961 | kfree_const(system->name); |
ae63b31e SR |
1962 | kfree(system); |
1963 | return NULL; | |
15075cac SR |
1964 | } |
1965 | ||
6ecc2d1c | 1966 | static struct dentry * |
ae63b31e | 1967 | event_subsystem_dir(struct trace_array *tr, const char *name, |
7f1d2f82 | 1968 | struct trace_event_file *file, struct dentry *parent) |
6ecc2d1c | 1969 | { |
7967b3e0 | 1970 | struct trace_subsystem_dir *dir; |
6ecc2d1c | 1971 | struct event_subsystem *system; |
e1112b4d | 1972 | struct dentry *entry; |
6ecc2d1c SR |
1973 | |
1974 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1975 | list_for_each_entry(dir, &tr->systems, list) { |
1976 | system = dir->subsystem; | |
dc82ec98 | 1977 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1978 | dir->nr_events++; |
1979 | file->system = dir; | |
1980 | return dir->entry; | |
dc82ec98 | 1981 | } |
6ecc2d1c SR |
1982 | } |
1983 | ||
ae63b31e SR |
1984 | /* Now see if the system itself exists. */ |
1985 | list_for_each_entry(system, &event_subsystems, list) { | |
1986 | if (strcmp(system->name, name) == 0) | |
1987 | break; | |
6ecc2d1c | 1988 | } |
ae63b31e SR |
1989 | /* Reset system variable when not found */ |
1990 | if (&system->list == &event_subsystems) | |
1991 | system = NULL; | |
6ecc2d1c | 1992 | |
ae63b31e SR |
1993 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1994 | if (!dir) | |
1995 | goto out_fail; | |
6ecc2d1c | 1996 | |
ae63b31e SR |
1997 | if (!system) { |
1998 | system = create_new_subsystem(name); | |
1999 | if (!system) | |
2000 | goto out_free; | |
2001 | } else | |
2002 | __get_system(system); | |
2003 | ||
8434dc93 | 2004 | dir->entry = tracefs_create_dir(name, parent); |
ae63b31e | 2005 | if (!dir->entry) { |
3448bac3 | 2006 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
2007 | __put_system(system); |
2008 | goto out_free; | |
6d723736 SR |
2009 | } |
2010 | ||
ae63b31e SR |
2011 | dir->tr = tr; |
2012 | dir->ref_count = 1; | |
2013 | dir->nr_events = 1; | |
2014 | dir->subsystem = system; | |
2015 | file->system = dir; | |
8b372562 | 2016 | |
8434dc93 | 2017 | entry = tracefs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 2018 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
2019 | if (!entry) { |
2020 | kfree(system->filter); | |
2021 | system->filter = NULL; | |
8434dc93 | 2022 | pr_warn("Could not create tracefs '%s/filter' entry\n", name); |
8b372562 | 2023 | } |
e1112b4d | 2024 | |
ae63b31e | 2025 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 2026 | &ftrace_system_enable_fops); |
8ae79a13 | 2027 | |
ae63b31e SR |
2028 | list_add(&dir->list, &tr->systems); |
2029 | ||
2030 | return dir->entry; | |
2031 | ||
2032 | out_free: | |
2033 | kfree(dir); | |
2034 | out_fail: | |
2035 | /* Only print this message if failed on memory allocation */ | |
2036 | if (!dir || !system) | |
3448bac3 | 2037 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 2038 | return NULL; |
6ecc2d1c SR |
2039 | } |
2040 | ||
1473e441 | 2041 | static int |
7f1d2f82 | 2042 | event_create_dir(struct dentry *parent, struct trace_event_file *file) |
1473e441 | 2043 | { |
2425bcb9 | 2044 | struct trace_event_call *call = file->event_call; |
ae63b31e | 2045 | struct trace_array *tr = file->tr; |
2e33af02 | 2046 | struct list_head *head; |
ae63b31e | 2047 | struct dentry *d_events; |
de7b2973 | 2048 | const char *name; |
fd994989 | 2049 | int ret; |
1473e441 | 2050 | |
6ecc2d1c SR |
2051 | /* |
2052 | * If the trace point header did not define TRACE_SYSTEM | |
2053 | * then the system would be called "TRACE_SYSTEM". | |
2054 | */ | |
ae63b31e SR |
2055 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
2056 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
2057 | if (!d_events) | |
2058 | return -ENOMEM; | |
2059 | } else | |
2060 | d_events = parent; | |
2061 | ||
687fcc4a | 2062 | name = trace_event_name(call); |
8434dc93 | 2063 | file->dir = tracefs_create_dir(name, d_events); |
ae63b31e | 2064 | if (!file->dir) { |
8434dc93 | 2065 | pr_warn("Could not create tracefs '%s' directory\n", name); |
1473e441 SR |
2066 | return -1; |
2067 | } | |
2068 | ||
9b63776f | 2069 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 2070 | trace_create_file("enable", 0644, file->dir, file, |
620a30e9 | 2071 | &ftrace_enable_fops); |
1473e441 | 2072 | |
2239291a | 2073 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 2074 | if (call->event.type && call->class->reg) |
1a11126b | 2075 | trace_create_file("id", 0444, file->dir, |
620a30e9 ON |
2076 | (void *)(long)call->event.type, |
2077 | &ftrace_event_id_fops); | |
2239291a | 2078 | #endif |
23725aee | 2079 | |
c9d932cf LZ |
2080 | /* |
2081 | * Other events may have the same class. Only update | |
2082 | * the fields if they are not already defined. | |
2083 | */ | |
2084 | head = trace_get_fields(call); | |
2085 | if (list_empty(head)) { | |
2086 | ret = call->class->define_fields(call); | |
2087 | if (ret < 0) { | |
3448bac3 FF |
2088 | pr_warn("Could not initialize trace point events/%s\n", |
2089 | name); | |
ae63b31e | 2090 | return -1; |
cf027f64 TZ |
2091 | } |
2092 | } | |
f306cc82 | 2093 | trace_create_file("filter", 0644, file->dir, file, |
620a30e9 | 2094 | &ftrace_event_filter_fops); |
cf027f64 | 2095 | |
85f2b082 TZ |
2096 | trace_create_file("trigger", 0644, file->dir, file, |
2097 | &event_trigger_fops); | |
2098 | ||
ae63b31e | 2099 | trace_create_file("format", 0444, file->dir, call, |
620a30e9 | 2100 | &ftrace_event_format_fops); |
6d723736 SR |
2101 | |
2102 | return 0; | |
2103 | } | |
2104 | ||
2425bcb9 | 2105 | static void remove_event_from_tracers(struct trace_event_call *call) |
ae63b31e | 2106 | { |
7f1d2f82 | 2107 | struct trace_event_file *file; |
ae63b31e SR |
2108 | struct trace_array *tr; |
2109 | ||
2110 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
2111 | if (file->event_call != call) |
2112 | continue; | |
2113 | ||
f6a84bdc | 2114 | remove_event_file_dir(file); |
ae63b31e SR |
2115 | /* |
2116 | * The do_for_each_event_file_safe() is | |
2117 | * a double loop. After finding the call for this | |
2118 | * trace_array, we use break to jump to the next | |
2119 | * trace_array. | |
2120 | */ | |
2121 | break; | |
2122 | } while_for_each_event_file(); | |
2123 | } | |
2124 | ||
2425bcb9 | 2125 | static void event_remove(struct trace_event_call *call) |
8781915a | 2126 | { |
ae63b31e | 2127 | struct trace_array *tr; |
7f1d2f82 | 2128 | struct trace_event_file *file; |
ae63b31e SR |
2129 | |
2130 | do_for_each_event_file(tr, file) { | |
2131 | if (file->event_call != call) | |
2132 | continue; | |
2133 | ftrace_event_enable_disable(file, 0); | |
2134 | /* | |
2135 | * The do_for_each_event_file() is | |
2136 | * a double loop. After finding the call for this | |
2137 | * trace_array, we use break to jump to the next | |
2138 | * trace_array. | |
2139 | */ | |
2140 | break; | |
2141 | } while_for_each_event_file(); | |
2142 | ||
8781915a | 2143 | if (call->event.funcs) |
9023c930 | 2144 | __unregister_trace_event(&call->event); |
ae63b31e | 2145 | remove_event_from_tracers(call); |
8781915a EG |
2146 | list_del(&call->list); |
2147 | } | |
2148 | ||
2425bcb9 | 2149 | static int event_init(struct trace_event_call *call) |
8781915a EG |
2150 | { |
2151 | int ret = 0; | |
de7b2973 | 2152 | const char *name; |
8781915a | 2153 | |
687fcc4a | 2154 | name = trace_event_name(call); |
de7b2973 | 2155 | if (WARN_ON(!name)) |
8781915a EG |
2156 | return -EINVAL; |
2157 | ||
2158 | if (call->class->raw_init) { | |
2159 | ret = call->class->raw_init(call); | |
2160 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 2161 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
2162 | } |
2163 | ||
2164 | return ret; | |
2165 | } | |
2166 | ||
67ead0a6 | 2167 | static int |
2425bcb9 | 2168 | __register_event(struct trace_event_call *call, struct module *mod) |
bd1a5c84 | 2169 | { |
bd1a5c84 | 2170 | int ret; |
6d723736 | 2171 | |
8781915a EG |
2172 | ret = event_init(call); |
2173 | if (ret < 0) | |
2174 | return ret; | |
701970b3 | 2175 | |
ae63b31e | 2176 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 2177 | call->mod = mod; |
88f70d75 | 2178 | |
ae63b31e | 2179 | return 0; |
bd1a5c84 MH |
2180 | } |
2181 | ||
0c564a53 SRRH |
2182 | static char *enum_replace(char *ptr, struct trace_enum_map *map, int len) |
2183 | { | |
2184 | int rlen; | |
2185 | int elen; | |
2186 | ||
2187 | /* Find the length of the enum value as a string */ | |
2188 | elen = snprintf(ptr, 0, "%ld", map->enum_value); | |
2189 | /* Make sure there's enough room to replace the string with the value */ | |
2190 | if (len < elen) | |
2191 | return NULL; | |
2192 | ||
2193 | snprintf(ptr, elen + 1, "%ld", map->enum_value); | |
2194 | ||
2195 | /* Get the rest of the string of ptr */ | |
2196 | rlen = strlen(ptr + len); | |
2197 | memmove(ptr + elen, ptr + len, rlen); | |
2198 | /* Make sure we end the new string */ | |
2199 | ptr[elen + rlen] = 0; | |
2200 | ||
2201 | return ptr + elen; | |
2202 | } | |
2203 | ||
2425bcb9 | 2204 | static void update_event_printk(struct trace_event_call *call, |
0c564a53 SRRH |
2205 | struct trace_enum_map *map) |
2206 | { | |
2207 | char *ptr; | |
2208 | int quote = 0; | |
2209 | int len = strlen(map->enum_string); | |
2210 | ||
2211 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
2212 | if (*ptr == '\\') { | |
2213 | ptr++; | |
2214 | /* paranoid */ | |
2215 | if (!*ptr) | |
2216 | break; | |
2217 | continue; | |
2218 | } | |
2219 | if (*ptr == '"') { | |
2220 | quote ^= 1; | |
2221 | continue; | |
2222 | } | |
2223 | if (quote) | |
2224 | continue; | |
2225 | if (isdigit(*ptr)) { | |
2226 | /* skip numbers */ | |
2227 | do { | |
2228 | ptr++; | |
2229 | /* Check for alpha chars like ULL */ | |
2230 | } while (isalnum(*ptr)); | |
3193899d SRRH |
2231 | if (!*ptr) |
2232 | break; | |
0c564a53 SRRH |
2233 | /* |
2234 | * A number must have some kind of delimiter after | |
2235 | * it, and we can ignore that too. | |
2236 | */ | |
2237 | continue; | |
2238 | } | |
2239 | if (isalpha(*ptr) || *ptr == '_') { | |
2240 | if (strncmp(map->enum_string, ptr, len) == 0 && | |
2241 | !isalnum(ptr[len]) && ptr[len] != '_') { | |
2242 | ptr = enum_replace(ptr, map, len); | |
2243 | /* Hmm, enum string smaller than value */ | |
2244 | if (WARN_ON_ONCE(!ptr)) | |
2245 | return; | |
2246 | /* | |
2247 | * No need to decrement here, as enum_replace() | |
2248 | * returns the pointer to the character passed | |
2249 | * the enum, and two enums can not be placed | |
2250 | * back to back without something in between. | |
2251 | * We can skip that something in between. | |
2252 | */ | |
2253 | continue; | |
2254 | } | |
2255 | skip_more: | |
2256 | do { | |
2257 | ptr++; | |
2258 | } while (isalnum(*ptr) || *ptr == '_'); | |
3193899d SRRH |
2259 | if (!*ptr) |
2260 | break; | |
0c564a53 SRRH |
2261 | /* |
2262 | * If what comes after this variable is a '.' or | |
2263 | * '->' then we can continue to ignore that string. | |
2264 | */ | |
2265 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
2266 | ptr += *ptr == '.' ? 1 : 2; | |
3193899d SRRH |
2267 | if (!*ptr) |
2268 | break; | |
0c564a53 SRRH |
2269 | goto skip_more; |
2270 | } | |
2271 | /* | |
2272 | * Once again, we can skip the delimiter that came | |
2273 | * after the string. | |
2274 | */ | |
2275 | continue; | |
2276 | } | |
2277 | } | |
2278 | } | |
2279 | ||
2280 | void trace_event_enum_update(struct trace_enum_map **map, int len) | |
2281 | { | |
2425bcb9 | 2282 | struct trace_event_call *call, *p; |
0c564a53 SRRH |
2283 | const char *last_system = NULL; |
2284 | int last_i; | |
2285 | int i; | |
2286 | ||
2287 | down_write(&trace_event_sem); | |
2288 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
2289 | /* events are usually grouped together with systems */ | |
2290 | if (!last_system || call->class->system != last_system) { | |
2291 | last_i = 0; | |
2292 | last_system = call->class->system; | |
2293 | } | |
2294 | ||
2295 | for (i = last_i; i < len; i++) { | |
2296 | if (call->class->system == map[i]->system) { | |
2297 | /* Save the first system if need be */ | |
2298 | if (!last_i) | |
2299 | last_i = i; | |
2300 | update_event_printk(call, map[i]); | |
2301 | } | |
2302 | } | |
2303 | } | |
2304 | up_write(&trace_event_sem); | |
2305 | } | |
2306 | ||
7f1d2f82 | 2307 | static struct trace_event_file * |
2425bcb9 | 2308 | trace_create_new_event(struct trace_event_call *call, |
da511bf3 SRRH |
2309 | struct trace_array *tr) |
2310 | { | |
7f1d2f82 | 2311 | struct trace_event_file *file; |
da511bf3 SRRH |
2312 | |
2313 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
2314 | if (!file) | |
2315 | return NULL; | |
2316 | ||
2317 | file->event_call = call; | |
2318 | file->tr = tr; | |
2319 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
2320 | atomic_set(&file->tm_ref, 0); |
2321 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
2322 | list_add(&file->list, &tr->events); |
2323 | ||
2324 | return file; | |
2325 | } | |
2326 | ||
ae63b31e SR |
2327 | /* Add an event to a trace directory */ |
2328 | static int | |
2425bcb9 | 2329 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) |
ae63b31e | 2330 | { |
7f1d2f82 | 2331 | struct trace_event_file *file; |
ae63b31e | 2332 | |
da511bf3 | 2333 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
2334 | if (!file) |
2335 | return -ENOMEM; | |
2336 | ||
620a30e9 | 2337 | return event_create_dir(tr->event_dir, file); |
ae63b31e SR |
2338 | } |
2339 | ||
77248221 SR |
2340 | /* |
2341 | * Just create a decriptor for early init. A descriptor is required | |
2342 | * for enabling events at boot. We want to enable events before | |
2343 | * the filesystem is initialized. | |
2344 | */ | |
2345 | static __init int | |
2425bcb9 | 2346 | __trace_early_add_new_event(struct trace_event_call *call, |
77248221 SR |
2347 | struct trace_array *tr) |
2348 | { | |
7f1d2f82 | 2349 | struct trace_event_file *file; |
77248221 | 2350 | |
da511bf3 | 2351 | file = trace_create_new_event(call, tr); |
77248221 SR |
2352 | if (!file) |
2353 | return -ENOMEM; | |
2354 | ||
77248221 SR |
2355 | return 0; |
2356 | } | |
2357 | ||
ae63b31e | 2358 | struct ftrace_module_file_ops; |
2425bcb9 | 2359 | static void __add_event_to_tracers(struct trace_event_call *call); |
ae63b31e | 2360 | |
bd1a5c84 | 2361 | /* Add an additional event_call dynamically */ |
2425bcb9 | 2362 | int trace_add_event_call(struct trace_event_call *call) |
bd1a5c84 MH |
2363 | { |
2364 | int ret; | |
a8227415 | 2365 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 2366 | mutex_lock(&event_mutex); |
701970b3 | 2367 | |
ae63b31e SR |
2368 | ret = __register_event(call, NULL); |
2369 | if (ret >= 0) | |
779c5e37 | 2370 | __add_event_to_tracers(call); |
a2ca5e03 | 2371 | |
ae63b31e | 2372 | mutex_unlock(&event_mutex); |
a8227415 | 2373 | mutex_unlock(&trace_types_lock); |
ae63b31e | 2374 | return ret; |
a2ca5e03 FW |
2375 | } |
2376 | ||
4fead8e4 | 2377 | /* |
a8227415 AL |
2378 | * Must be called under locking of trace_types_lock, event_mutex and |
2379 | * trace_event_sem. | |
4fead8e4 | 2380 | */ |
2425bcb9 | 2381 | static void __trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2382 | { |
8781915a | 2383 | event_remove(call); |
bd1a5c84 | 2384 | trace_destroy_fields(call); |
57375747 ON |
2385 | free_event_filter(call->filter); |
2386 | call->filter = NULL; | |
bd1a5c84 MH |
2387 | } |
2388 | ||
2425bcb9 | 2389 | static int probe_remove_event_call(struct trace_event_call *call) |
2816c551 ON |
2390 | { |
2391 | struct trace_array *tr; | |
7f1d2f82 | 2392 | struct trace_event_file *file; |
2816c551 ON |
2393 | |
2394 | #ifdef CONFIG_PERF_EVENTS | |
2395 | if (call->perf_refcount) | |
2396 | return -EBUSY; | |
2397 | #endif | |
2398 | do_for_each_event_file(tr, file) { | |
2399 | if (file->event_call != call) | |
2400 | continue; | |
2401 | /* | |
2402 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
5d6ad960 | 2403 | * we are going to do, EVENT_FILE_FL_SOFT_MODE can suppress |
2816c551 ON |
2404 | * TRACE_REG_UNREGISTER. |
2405 | */ | |
5d6ad960 | 2406 | if (file->flags & EVENT_FILE_FL_ENABLED) |
2816c551 | 2407 | return -EBUSY; |
2ba64035 SRRH |
2408 | /* |
2409 | * The do_for_each_event_file_safe() is | |
2410 | * a double loop. After finding the call for this | |
2411 | * trace_array, we use break to jump to the next | |
2412 | * trace_array. | |
2413 | */ | |
2816c551 ON |
2414 | break; |
2415 | } while_for_each_event_file(); | |
2416 | ||
2417 | __trace_remove_event_call(call); | |
2418 | ||
2419 | return 0; | |
2420 | } | |
2421 | ||
bd1a5c84 | 2422 | /* Remove an event_call */ |
2425bcb9 | 2423 | int trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2424 | { |
2816c551 ON |
2425 | int ret; |
2426 | ||
a8227415 | 2427 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 2428 | mutex_lock(&event_mutex); |
52f6ad6d | 2429 | down_write(&trace_event_sem); |
2816c551 | 2430 | ret = probe_remove_event_call(call); |
52f6ad6d | 2431 | up_write(&trace_event_sem); |
bd1a5c84 | 2432 | mutex_unlock(&event_mutex); |
a8227415 | 2433 | mutex_unlock(&trace_types_lock); |
2816c551 ON |
2434 | |
2435 | return ret; | |
bd1a5c84 MH |
2436 | } |
2437 | ||
2438 | #define for_each_event(event, start, end) \ | |
2439 | for (event = start; \ | |
2440 | (unsigned long)event < (unsigned long)end; \ | |
2441 | event++) | |
2442 | ||
2443 | #ifdef CONFIG_MODULES | |
2444 | ||
6d723736 SR |
2445 | static void trace_module_add_events(struct module *mod) |
2446 | { | |
2425bcb9 | 2447 | struct trace_event_call **call, **start, **end; |
6d723736 | 2448 | |
45ab2813 SRRH |
2449 | if (!mod->num_trace_events) |
2450 | return; | |
2451 | ||
2452 | /* Don't add infrastructure for mods without tracepoints */ | |
2453 | if (trace_module_has_bad_taint(mod)) { | |
2454 | pr_err("%s: module has bad taint, not creating trace events\n", | |
2455 | mod->name); | |
2456 | return; | |
2457 | } | |
2458 | ||
6d723736 SR |
2459 | start = mod->trace_events; |
2460 | end = mod->trace_events + mod->num_trace_events; | |
2461 | ||
6d723736 | 2462 | for_each_event(call, start, end) { |
ae63b31e | 2463 | __register_event(*call, mod); |
779c5e37 | 2464 | __add_event_to_tracers(*call); |
6d723736 SR |
2465 | } |
2466 | } | |
2467 | ||
2468 | static void trace_module_remove_events(struct module *mod) | |
2469 | { | |
2425bcb9 | 2470 | struct trace_event_call *call, *p; |
575380da | 2471 | bool clear_trace = false; |
6d723736 | 2472 | |
52f6ad6d | 2473 | down_write(&trace_event_sem); |
6d723736 SR |
2474 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
2475 | if (call->mod == mod) { | |
575380da SRRH |
2476 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
2477 | clear_trace = true; | |
bd1a5c84 | 2478 | __trace_remove_event_call(call); |
6d723736 SR |
2479 | } |
2480 | } | |
52f6ad6d | 2481 | up_write(&trace_event_sem); |
9456f0fa SR |
2482 | |
2483 | /* | |
2484 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
2485 | * registered any events that were used. The only worry is if |
2486 | * a new module gets loaded, and takes on the same id as the events | |
2487 | * of this module. When printing out the buffer, traced events left | |
2488 | * over from this module may be passed to the new module events and | |
2489 | * unexpected results may occur. | |
9456f0fa | 2490 | */ |
575380da | 2491 | if (clear_trace) |
873c642f | 2492 | tracing_reset_all_online_cpus(); |
6d723736 SR |
2493 | } |
2494 | ||
61f919a1 SR |
2495 | static int trace_module_notify(struct notifier_block *self, |
2496 | unsigned long val, void *data) | |
6d723736 SR |
2497 | { |
2498 | struct module *mod = data; | |
2499 | ||
a8227415 | 2500 | mutex_lock(&trace_types_lock); |
6d723736 SR |
2501 | mutex_lock(&event_mutex); |
2502 | switch (val) { | |
2503 | case MODULE_STATE_COMING: | |
2504 | trace_module_add_events(mod); | |
2505 | break; | |
2506 | case MODULE_STATE_GOING: | |
2507 | trace_module_remove_events(mod); | |
2508 | break; | |
2509 | } | |
2510 | mutex_unlock(&event_mutex); | |
a8227415 | 2511 | mutex_unlock(&trace_types_lock); |
fd994989 | 2512 | |
1473e441 SR |
2513 | return 0; |
2514 | } | |
315326c1 | 2515 | |
836d481e ON |
2516 | static struct notifier_block trace_module_nb = { |
2517 | .notifier_call = trace_module_notify, | |
3673b8e4 | 2518 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 2519 | }; |
61f919a1 | 2520 | #endif /* CONFIG_MODULES */ |
1473e441 | 2521 | |
ae63b31e SR |
2522 | /* Create a new event directory structure for a trace directory. */ |
2523 | static void | |
2524 | __trace_add_event_dirs(struct trace_array *tr) | |
2525 | { | |
2425bcb9 | 2526 | struct trace_event_call *call; |
ae63b31e SR |
2527 | int ret; |
2528 | ||
2529 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 2530 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 2531 | if (ret < 0) |
3448bac3 | 2532 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2533 | trace_event_name(call)); |
ae63b31e SR |
2534 | } |
2535 | } | |
2536 | ||
7f1d2f82 | 2537 | struct trace_event_file * |
3cd715de SRRH |
2538 | find_event_file(struct trace_array *tr, const char *system, const char *event) |
2539 | { | |
7f1d2f82 | 2540 | struct trace_event_file *file; |
2425bcb9 | 2541 | struct trace_event_call *call; |
de7b2973 | 2542 | const char *name; |
3cd715de SRRH |
2543 | |
2544 | list_for_each_entry(file, &tr->events, list) { | |
2545 | ||
2546 | call = file->event_call; | |
687fcc4a | 2547 | name = trace_event_name(call); |
3cd715de | 2548 | |
de7b2973 | 2549 | if (!name || !call->class || !call->class->reg) |
3cd715de SRRH |
2550 | continue; |
2551 | ||
2552 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2553 | continue; | |
2554 | ||
de7b2973 | 2555 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
2556 | strcmp(system, call->class->system) == 0) |
2557 | return file; | |
2558 | } | |
2559 | return NULL; | |
2560 | } | |
2561 | ||
2875a08b SRRH |
2562 | #ifdef CONFIG_DYNAMIC_FTRACE |
2563 | ||
2564 | /* Avoid typos */ | |
2565 | #define ENABLE_EVENT_STR "enable_event" | |
2566 | #define DISABLE_EVENT_STR "disable_event" | |
2567 | ||
2568 | struct event_probe_data { | |
7f1d2f82 | 2569 | struct trace_event_file *file; |
2875a08b SRRH |
2570 | unsigned long count; |
2571 | int ref; | |
2572 | bool enable; | |
2573 | }; | |
2574 | ||
3cd715de SRRH |
2575 | static void |
2576 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2577 | { | |
2578 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2579 | struct event_probe_data *data = *pdata; | |
2580 | ||
2581 | if (!data) | |
2582 | return; | |
2583 | ||
2584 | if (data->enable) | |
5d6ad960 | 2585 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
3cd715de | 2586 | else |
5d6ad960 | 2587 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
3cd715de SRRH |
2588 | } |
2589 | ||
2590 | static void | |
2591 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2592 | { | |
2593 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2594 | struct event_probe_data *data = *pdata; | |
2595 | ||
2596 | if (!data) | |
2597 | return; | |
2598 | ||
2599 | if (!data->count) | |
2600 | return; | |
2601 | ||
2602 | /* Skip if the event is in a state we want to switch to */ | |
5d6ad960 | 2603 | if (data->enable == !(data->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
3cd715de SRRH |
2604 | return; |
2605 | ||
2606 | if (data->count != -1) | |
2607 | (data->count)--; | |
2608 | ||
2609 | event_enable_probe(ip, parent_ip, _data); | |
2610 | } | |
2611 | ||
2612 | static int | |
2613 | event_enable_print(struct seq_file *m, unsigned long ip, | |
2614 | struct ftrace_probe_ops *ops, void *_data) | |
2615 | { | |
2616 | struct event_probe_data *data = _data; | |
2617 | ||
2618 | seq_printf(m, "%ps:", (void *)ip); | |
2619 | ||
2620 | seq_printf(m, "%s:%s:%s", | |
2621 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, | |
2622 | data->file->event_call->class->system, | |
687fcc4a | 2623 | trace_event_name(data->file->event_call)); |
3cd715de SRRH |
2624 | |
2625 | if (data->count == -1) | |
fa6f0cc7 | 2626 | seq_puts(m, ":unlimited\n"); |
3cd715de SRRH |
2627 | else |
2628 | seq_printf(m, ":count=%ld\n", data->count); | |
2629 | ||
2630 | return 0; | |
2631 | } | |
2632 | ||
2633 | static int | |
2634 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, | |
2635 | void **_data) | |
2636 | { | |
2637 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2638 | struct event_probe_data *data = *pdata; | |
2639 | ||
2640 | data->ref++; | |
2641 | return 0; | |
2642 | } | |
2643 | ||
2644 | static void | |
2645 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, | |
2646 | void **_data) | |
2647 | { | |
2648 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2649 | struct event_probe_data *data = *pdata; | |
2650 | ||
2651 | if (WARN_ON_ONCE(data->ref <= 0)) | |
2652 | return; | |
2653 | ||
2654 | data->ref--; | |
2655 | if (!data->ref) { | |
2656 | /* Remove the SOFT_MODE flag */ | |
2657 | __ftrace_event_enable_disable(data->file, 0, 1); | |
2658 | module_put(data->file->event_call->mod); | |
2659 | kfree(data); | |
2660 | } | |
2661 | *pdata = NULL; | |
2662 | } | |
2663 | ||
2664 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2665 | .func = event_enable_probe, | |
2666 | .print = event_enable_print, | |
2667 | .init = event_enable_init, | |
2668 | .free = event_enable_free, | |
2669 | }; | |
2670 | ||
2671 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
2672 | .func = event_enable_count_probe, | |
2673 | .print = event_enable_print, | |
2674 | .init = event_enable_init, | |
2675 | .free = event_enable_free, | |
2676 | }; | |
2677 | ||
2678 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
2679 | .func = event_enable_probe, | |
2680 | .print = event_enable_print, | |
2681 | .init = event_enable_init, | |
2682 | .free = event_enable_free, | |
2683 | }; | |
2684 | ||
2685 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2686 | .func = event_enable_count_probe, | |
2687 | .print = event_enable_print, | |
2688 | .init = event_enable_init, | |
2689 | .free = event_enable_free, | |
2690 | }; | |
2691 | ||
2692 | static int | |
2693 | event_enable_func(struct ftrace_hash *hash, | |
2694 | char *glob, char *cmd, char *param, int enabled) | |
2695 | { | |
2696 | struct trace_array *tr = top_trace_array(); | |
7f1d2f82 | 2697 | struct trace_event_file *file; |
3cd715de SRRH |
2698 | struct ftrace_probe_ops *ops; |
2699 | struct event_probe_data *data; | |
2700 | const char *system; | |
2701 | const char *event; | |
2702 | char *number; | |
2703 | bool enable; | |
2704 | int ret; | |
2705 | ||
dc81e5e3 YY |
2706 | if (!tr) |
2707 | return -ENODEV; | |
2708 | ||
3cd715de | 2709 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 2710 | if (!enabled || !param) |
3cd715de SRRH |
2711 | return -EINVAL; |
2712 | ||
2713 | system = strsep(¶m, ":"); | |
2714 | if (!param) | |
2715 | return -EINVAL; | |
2716 | ||
2717 | event = strsep(¶m, ":"); | |
2718 | ||
2719 | mutex_lock(&event_mutex); | |
2720 | ||
2721 | ret = -EINVAL; | |
2722 | file = find_event_file(tr, system, event); | |
2723 | if (!file) | |
2724 | goto out; | |
2725 | ||
2726 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2727 | ||
2728 | if (enable) | |
2729 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2730 | else | |
2731 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2732 | ||
2733 | if (glob[0] == '!') { | |
2734 | unregister_ftrace_function_probe_func(glob+1, ops); | |
2735 | ret = 0; | |
2736 | goto out; | |
2737 | } | |
2738 | ||
2739 | ret = -ENOMEM; | |
2740 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2741 | if (!data) | |
2742 | goto out; | |
2743 | ||
2744 | data->enable = enable; | |
2745 | data->count = -1; | |
2746 | data->file = file; | |
2747 | ||
2748 | if (!param) | |
2749 | goto out_reg; | |
2750 | ||
2751 | number = strsep(¶m, ":"); | |
2752 | ||
2753 | ret = -EINVAL; | |
2754 | if (!strlen(number)) | |
2755 | goto out_free; | |
2756 | ||
2757 | /* | |
2758 | * We use the callback data field (which is a pointer) | |
2759 | * as our counter. | |
2760 | */ | |
2761 | ret = kstrtoul(number, 0, &data->count); | |
2762 | if (ret) | |
2763 | goto out_free; | |
2764 | ||
2765 | out_reg: | |
2766 | /* Don't let event modules unload while probe registered */ | |
2767 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2768 | if (!ret) { |
2769 | ret = -EBUSY; | |
3cd715de | 2770 | goto out_free; |
6ed01066 | 2771 | } |
3cd715de SRRH |
2772 | |
2773 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2774 | if (ret < 0) | |
2775 | goto out_put; | |
2776 | ret = register_ftrace_function_probe(glob, ops, data); | |
ff305ded SRRH |
2777 | /* |
2778 | * The above returns on success the # of functions enabled, | |
2779 | * but if it didn't find any functions it returns zero. | |
2780 | * Consider no functions a failure too. | |
2781 | */ | |
a5b85bd1 MH |
2782 | if (!ret) { |
2783 | ret = -ENOENT; | |
3cd715de | 2784 | goto out_disable; |
ff305ded SRRH |
2785 | } else if (ret < 0) |
2786 | goto out_disable; | |
2787 | /* Just return zero, not the number of enabled functions */ | |
2788 | ret = 0; | |
3cd715de SRRH |
2789 | out: |
2790 | mutex_unlock(&event_mutex); | |
2791 | return ret; | |
2792 | ||
2793 | out_disable: | |
2794 | __ftrace_event_enable_disable(file, 0, 1); | |
2795 | out_put: | |
2796 | module_put(file->event_call->mod); | |
2797 | out_free: | |
2798 | kfree(data); | |
2799 | goto out; | |
2800 | } | |
2801 | ||
2802 | static struct ftrace_func_command event_enable_cmd = { | |
2803 | .name = ENABLE_EVENT_STR, | |
2804 | .func = event_enable_func, | |
2805 | }; | |
2806 | ||
2807 | static struct ftrace_func_command event_disable_cmd = { | |
2808 | .name = DISABLE_EVENT_STR, | |
2809 | .func = event_enable_func, | |
2810 | }; | |
2811 | ||
2812 | static __init int register_event_cmds(void) | |
2813 | { | |
2814 | int ret; | |
2815 | ||
2816 | ret = register_ftrace_command(&event_enable_cmd); | |
2817 | if (WARN_ON(ret < 0)) | |
2818 | return ret; | |
2819 | ret = register_ftrace_command(&event_disable_cmd); | |
2820 | if (WARN_ON(ret < 0)) | |
2821 | unregister_ftrace_command(&event_enable_cmd); | |
2822 | return ret; | |
2823 | } | |
2824 | #else | |
2825 | static inline int register_event_cmds(void) { return 0; } | |
2826 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2827 | ||
77248221 | 2828 | /* |
7f1d2f82 | 2829 | * The top level array has already had its trace_event_file |
77248221 | 2830 | * descriptors created in order to allow for early events to |
8434dc93 | 2831 | * be recorded. This function is called after the tracefs has been |
77248221 SR |
2832 | * initialized, and we now have to create the files associated |
2833 | * to the events. | |
2834 | */ | |
2835 | static __init void | |
2836 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2837 | { | |
7f1d2f82 | 2838 | struct trace_event_file *file; |
77248221 SR |
2839 | int ret; |
2840 | ||
2841 | ||
2842 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 2843 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 2844 | if (ret < 0) |
3448bac3 | 2845 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2846 | trace_event_name(file->event_call)); |
77248221 SR |
2847 | } |
2848 | } | |
2849 | ||
2850 | /* | |
2851 | * For early boot up, the top trace array requires to have | |
2852 | * a list of events that can be enabled. This must be done before | |
2853 | * the filesystem is set up in order to allow events to be traced | |
2854 | * early. | |
2855 | */ | |
2856 | static __init void | |
2857 | __trace_early_add_events(struct trace_array *tr) | |
2858 | { | |
2425bcb9 | 2859 | struct trace_event_call *call; |
77248221 SR |
2860 | int ret; |
2861 | ||
2862 | list_for_each_entry(call, &ftrace_events, list) { | |
2863 | /* Early boot up should not have any modules loaded */ | |
2864 | if (WARN_ON_ONCE(call->mod)) | |
2865 | continue; | |
2866 | ||
2867 | ret = __trace_early_add_new_event(call, tr); | |
2868 | if (ret < 0) | |
3448bac3 | 2869 | pr_warn("Could not create early event %s\n", |
687fcc4a | 2870 | trace_event_name(call)); |
77248221 SR |
2871 | } |
2872 | } | |
2873 | ||
0c8916c3 SR |
2874 | /* Remove the event directory structure for a trace directory. */ |
2875 | static void | |
2876 | __trace_remove_event_dirs(struct trace_array *tr) | |
2877 | { | |
7f1d2f82 | 2878 | struct trace_event_file *file, *next; |
0c8916c3 | 2879 | |
f6a84bdc ON |
2880 | list_for_each_entry_safe(file, next, &tr->events, list) |
2881 | remove_event_file_dir(file); | |
0c8916c3 SR |
2882 | } |
2883 | ||
2425bcb9 | 2884 | static void __add_event_to_tracers(struct trace_event_call *call) |
ae63b31e SR |
2885 | { |
2886 | struct trace_array *tr; | |
2887 | ||
620a30e9 ON |
2888 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
2889 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
2890 | } |
2891 | ||
2425bcb9 SRRH |
2892 | extern struct trace_event_call *__start_ftrace_events[]; |
2893 | extern struct trace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2894 | |
020e5f85 LZ |
2895 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2896 | ||
2897 | static __init int setup_trace_event(char *str) | |
2898 | { | |
2899 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2900 | ring_buffer_expanded = true; |
2901 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2902 | |
2903 | return 1; | |
2904 | } | |
2905 | __setup("trace_event=", setup_trace_event); | |
2906 | ||
77248221 SR |
2907 | /* Expects to have event_mutex held when called */ |
2908 | static int | |
2909 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2910 | { |
2911 | struct dentry *d_events; | |
2912 | struct dentry *entry; | |
2913 | ||
8434dc93 | 2914 | entry = tracefs_create_file("set_event", 0644, parent, |
ae63b31e SR |
2915 | tr, &ftrace_set_event_fops); |
2916 | if (!entry) { | |
8434dc93 | 2917 | pr_warn("Could not create tracefs 'set_event' entry\n"); |
ae63b31e SR |
2918 | return -ENOMEM; |
2919 | } | |
2920 | ||
8434dc93 | 2921 | d_events = tracefs_create_dir("events", parent); |
277ba044 | 2922 | if (!d_events) { |
8434dc93 | 2923 | pr_warn("Could not create tracefs 'events' directory\n"); |
277ba044 SR |
2924 | return -ENOMEM; |
2925 | } | |
ae63b31e | 2926 | |
49090107 SRRH |
2927 | entry = tracefs_create_file("set_event_pid", 0644, parent, |
2928 | tr, &ftrace_set_event_pid_fops); | |
2929 | ||
ae63b31e SR |
2930 | /* ring buffer internal formats */ |
2931 | trace_create_file("header_page", 0444, d_events, | |
2932 | ring_buffer_print_page_header, | |
2933 | &ftrace_show_header_fops); | |
2934 | ||
2935 | trace_create_file("header_event", 0444, d_events, | |
2936 | ring_buffer_print_entry_header, | |
2937 | &ftrace_show_header_fops); | |
2938 | ||
2939 | trace_create_file("enable", 0644, d_events, | |
2940 | tr, &ftrace_tr_enable_fops); | |
2941 | ||
2942 | tr->event_dir = d_events; | |
77248221 SR |
2943 | |
2944 | return 0; | |
2945 | } | |
2946 | ||
2947 | /** | |
2948 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2949 | * @parent: The parent dentry to place the files/directories for events in | |
2950 | * @tr: The trace array associated with these events | |
2951 | * | |
2952 | * When a new instance is created, it needs to set up its events | |
2953 | * directory, as well as other files associated with events. It also | |
2954 | * creates the event hierachry in the @parent/events directory. | |
2955 | * | |
2956 | * Returns 0 on success. | |
2957 | */ | |
2958 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2959 | { | |
2960 | int ret; | |
2961 | ||
2962 | mutex_lock(&event_mutex); | |
2963 | ||
2964 | ret = create_event_toplevel_files(parent, tr); | |
2965 | if (ret) | |
2966 | goto out_unlock; | |
2967 | ||
52f6ad6d | 2968 | down_write(&trace_event_sem); |
ae63b31e | 2969 | __trace_add_event_dirs(tr); |
52f6ad6d | 2970 | up_write(&trace_event_sem); |
277ba044 | 2971 | |
77248221 | 2972 | out_unlock: |
277ba044 | 2973 | mutex_unlock(&event_mutex); |
ae63b31e | 2974 | |
77248221 SR |
2975 | return ret; |
2976 | } | |
2977 | ||
2978 | /* | |
2979 | * The top trace array already had its file descriptors created. | |
2980 | * Now the files themselves need to be created. | |
2981 | */ | |
2982 | static __init int | |
2983 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2984 | { | |
2985 | int ret; | |
2986 | ||
2987 | mutex_lock(&event_mutex); | |
2988 | ||
2989 | ret = create_event_toplevel_files(parent, tr); | |
2990 | if (ret) | |
2991 | goto out_unlock; | |
2992 | ||
52f6ad6d | 2993 | down_write(&trace_event_sem); |
77248221 | 2994 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 2995 | up_write(&trace_event_sem); |
77248221 SR |
2996 | |
2997 | out_unlock: | |
2998 | mutex_unlock(&event_mutex); | |
2999 | ||
3000 | return ret; | |
ae63b31e SR |
3001 | } |
3002 | ||
0c8916c3 SR |
3003 | int event_trace_del_tracer(struct trace_array *tr) |
3004 | { | |
0c8916c3 SR |
3005 | mutex_lock(&event_mutex); |
3006 | ||
85f2b082 TZ |
3007 | /* Disable any event triggers and associated soft-disabled events */ |
3008 | clear_event_triggers(tr); | |
3009 | ||
49090107 SRRH |
3010 | /* Clear the pid list */ |
3011 | __ftrace_clear_event_pids(tr); | |
3012 | ||
2a6c24af SRRH |
3013 | /* Disable any running events */ |
3014 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
3015 | ||
3ccb0123 SR |
3016 | /* Access to events are within rcu_read_lock_sched() */ |
3017 | synchronize_sched(); | |
3018 | ||
52f6ad6d | 3019 | down_write(&trace_event_sem); |
0c8916c3 | 3020 | __trace_remove_event_dirs(tr); |
8434dc93 | 3021 | tracefs_remove_recursive(tr->event_dir); |
52f6ad6d | 3022 | up_write(&trace_event_sem); |
0c8916c3 SR |
3023 | |
3024 | tr->event_dir = NULL; | |
3025 | ||
3026 | mutex_unlock(&event_mutex); | |
3027 | ||
3028 | return 0; | |
3029 | } | |
3030 | ||
d1a29143 SR |
3031 | static __init int event_trace_memsetup(void) |
3032 | { | |
3033 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
7f1d2f82 | 3034 | file_cachep = KMEM_CACHE(trace_event_file, SLAB_PANIC); |
d1a29143 SR |
3035 | return 0; |
3036 | } | |
3037 | ||
ce1039bd SRRH |
3038 | static __init void |
3039 | early_enable_events(struct trace_array *tr, bool disable_first) | |
3040 | { | |
3041 | char *buf = bootup_event_buf; | |
3042 | char *token; | |
3043 | int ret; | |
3044 | ||
3045 | while (true) { | |
3046 | token = strsep(&buf, ","); | |
3047 | ||
3048 | if (!token) | |
3049 | break; | |
ce1039bd | 3050 | |
43ed3843 SRRH |
3051 | if (*token) { |
3052 | /* Restarting syscalls requires that we stop them first */ | |
3053 | if (disable_first) | |
3054 | ftrace_set_clr_event(tr, token, 0); | |
ce1039bd | 3055 | |
43ed3843 SRRH |
3056 | ret = ftrace_set_clr_event(tr, token, 1); |
3057 | if (ret) | |
3058 | pr_warn("Failed to enable trace event: %s\n", token); | |
3059 | } | |
ce1039bd SRRH |
3060 | |
3061 | /* Put back the comma to allow this to be called again */ | |
3062 | if (buf) | |
3063 | *(buf - 1) = ','; | |
3064 | } | |
3065 | } | |
3066 | ||
8781915a EG |
3067 | static __init int event_trace_enable(void) |
3068 | { | |
ae63b31e | 3069 | struct trace_array *tr = top_trace_array(); |
2425bcb9 | 3070 | struct trace_event_call **iter, *call; |
8781915a EG |
3071 | int ret; |
3072 | ||
dc81e5e3 YY |
3073 | if (!tr) |
3074 | return -ENODEV; | |
3075 | ||
8781915a EG |
3076 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
3077 | ||
3078 | call = *iter; | |
3079 | ret = event_init(call); | |
3080 | if (!ret) | |
3081 | list_add(&call->list, &ftrace_events); | |
3082 | } | |
3083 | ||
77248221 SR |
3084 | /* |
3085 | * We need the top trace array to have a working set of trace | |
3086 | * points at early init, before the debug files and directories | |
3087 | * are created. Create the file entries now, and attach them | |
3088 | * to the actual file dentries later. | |
3089 | */ | |
3090 | __trace_early_add_events(tr); | |
3091 | ||
ce1039bd | 3092 | early_enable_events(tr, false); |
81698831 SR |
3093 | |
3094 | trace_printk_start_comm(); | |
3095 | ||
3cd715de SRRH |
3096 | register_event_cmds(); |
3097 | ||
85f2b082 TZ |
3098 | register_trigger_cmds(); |
3099 | ||
8781915a EG |
3100 | return 0; |
3101 | } | |
3102 | ||
ce1039bd SRRH |
3103 | /* |
3104 | * event_trace_enable() is called from trace_event_init() first to | |
3105 | * initialize events and perhaps start any events that are on the | |
3106 | * command line. Unfortunately, there are some events that will not | |
3107 | * start this early, like the system call tracepoints that need | |
3108 | * to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable() | |
3109 | * is called before pid 1 starts, and this flag is never set, making | |
3110 | * the syscall tracepoint never get reached, but the event is enabled | |
3111 | * regardless (and not doing anything). | |
3112 | */ | |
3113 | static __init int event_trace_enable_again(void) | |
3114 | { | |
3115 | struct trace_array *tr; | |
3116 | ||
3117 | tr = top_trace_array(); | |
3118 | if (!tr) | |
3119 | return -ENODEV; | |
3120 | ||
3121 | early_enable_events(tr, true); | |
3122 | ||
3123 | return 0; | |
3124 | } | |
3125 | ||
3126 | early_initcall(event_trace_enable_again); | |
3127 | ||
b77e38aa SR |
3128 | static __init int event_trace_init(void) |
3129 | { | |
ae63b31e | 3130 | struct trace_array *tr; |
b77e38aa SR |
3131 | struct dentry *d_tracer; |
3132 | struct dentry *entry; | |
6d723736 | 3133 | int ret; |
b77e38aa | 3134 | |
ae63b31e | 3135 | tr = top_trace_array(); |
dc81e5e3 YY |
3136 | if (!tr) |
3137 | return -ENODEV; | |
ae63b31e | 3138 | |
b77e38aa | 3139 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 3140 | if (IS_ERR(d_tracer)) |
b77e38aa SR |
3141 | return 0; |
3142 | ||
8434dc93 | 3143 | entry = tracefs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 3144 | tr, &ftrace_avail_fops); |
2314c4ae | 3145 | if (!entry) |
8434dc93 | 3146 | pr_warn("Could not create tracefs 'available_events' entry\n"); |
2314c4ae | 3147 | |
9f616680 DW |
3148 | if (trace_define_generic_fields()) |
3149 | pr_warn("tracing: Failed to allocated generic fields"); | |
3150 | ||
8728fe50 | 3151 | if (trace_define_common_fields()) |
3448bac3 | 3152 | pr_warn("tracing: Failed to allocate common fields"); |
8728fe50 | 3153 | |
77248221 | 3154 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
3155 | if (ret) |
3156 | return ret; | |
020e5f85 | 3157 | |
836d481e | 3158 | #ifdef CONFIG_MODULES |
6d723736 | 3159 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 3160 | if (ret) |
3448bac3 | 3161 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 3162 | #endif |
b77e38aa SR |
3163 | return 0; |
3164 | } | |
5f893b26 SRRH |
3165 | |
3166 | void __init trace_event_init(void) | |
3167 | { | |
3168 | event_trace_memsetup(); | |
3169 | init_ftrace_syscalls(); | |
3170 | event_trace_enable(); | |
3171 | } | |
3172 | ||
b77e38aa | 3173 | fs_initcall(event_trace_init); |
e6187007 SR |
3174 | |
3175 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
3176 | ||
3177 | static DEFINE_SPINLOCK(test_spinlock); | |
3178 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
3179 | static DEFINE_MUTEX(test_mutex); | |
3180 | ||
3181 | static __init void test_work(struct work_struct *dummy) | |
3182 | { | |
3183 | spin_lock(&test_spinlock); | |
3184 | spin_lock_irq(&test_spinlock_irq); | |
3185 | udelay(1); | |
3186 | spin_unlock_irq(&test_spinlock_irq); | |
3187 | spin_unlock(&test_spinlock); | |
3188 | ||
3189 | mutex_lock(&test_mutex); | |
3190 | msleep(1); | |
3191 | mutex_unlock(&test_mutex); | |
3192 | } | |
3193 | ||
3194 | static __init int event_test_thread(void *unused) | |
3195 | { | |
3196 | void *test_malloc; | |
3197 | ||
3198 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
3199 | if (!test_malloc) | |
3200 | pr_info("failed to kmalloc\n"); | |
3201 | ||
3202 | schedule_on_each_cpu(test_work); | |
3203 | ||
3204 | kfree(test_malloc); | |
3205 | ||
3206 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 3207 | while (!kthread_should_stop()) { |
e6187007 | 3208 | schedule(); |
fe0e01c7 PZ |
3209 | set_current_state(TASK_INTERRUPTIBLE); |
3210 | } | |
3211 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
3212 | |
3213 | return 0; | |
3214 | } | |
3215 | ||
3216 | /* | |
3217 | * Do various things that may trigger events. | |
3218 | */ | |
3219 | static __init void event_test_stuff(void) | |
3220 | { | |
3221 | struct task_struct *test_thread; | |
3222 | ||
3223 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
3224 | msleep(1); | |
3225 | kthread_stop(test_thread); | |
3226 | } | |
3227 | ||
3228 | /* | |
3229 | * For every trace event defined, we will test each trace point separately, | |
3230 | * and then by groups, and finally all trace points. | |
3231 | */ | |
9ea21c1e | 3232 | static __init void event_trace_self_tests(void) |
e6187007 | 3233 | { |
7967b3e0 | 3234 | struct trace_subsystem_dir *dir; |
7f1d2f82 | 3235 | struct trace_event_file *file; |
2425bcb9 | 3236 | struct trace_event_call *call; |
e6187007 | 3237 | struct event_subsystem *system; |
ae63b31e | 3238 | struct trace_array *tr; |
e6187007 SR |
3239 | int ret; |
3240 | ||
ae63b31e | 3241 | tr = top_trace_array(); |
dc81e5e3 YY |
3242 | if (!tr) |
3243 | return; | |
ae63b31e | 3244 | |
e6187007 SR |
3245 | pr_info("Running tests on trace events:\n"); |
3246 | ||
ae63b31e SR |
3247 | list_for_each_entry(file, &tr->events, list) { |
3248 | ||
3249 | call = file->event_call; | |
e6187007 | 3250 | |
2239291a SR |
3251 | /* Only test those that have a probe */ |
3252 | if (!call->class || !call->class->probe) | |
e6187007 SR |
3253 | continue; |
3254 | ||
1f5a6b45 SR |
3255 | /* |
3256 | * Testing syscall events here is pretty useless, but | |
3257 | * we still do it if configured. But this is time consuming. | |
3258 | * What we really need is a user thread to perform the | |
3259 | * syscalls as we test. | |
3260 | */ | |
3261 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
3262 | if (call->class->system && |
3263 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
3264 | continue; |
3265 | #endif | |
3266 | ||
687fcc4a | 3267 | pr_info("Testing event %s: ", trace_event_name(call)); |
e6187007 SR |
3268 | |
3269 | /* | |
3270 | * If an event is already enabled, someone is using | |
3271 | * it and the self test should not be on. | |
3272 | */ | |
5d6ad960 | 3273 | if (file->flags & EVENT_FILE_FL_ENABLED) { |
3448bac3 | 3274 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
3275 | WARN_ON_ONCE(1); |
3276 | continue; | |
3277 | } | |
3278 | ||
ae63b31e | 3279 | ftrace_event_enable_disable(file, 1); |
e6187007 | 3280 | event_test_stuff(); |
ae63b31e | 3281 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
3282 | |
3283 | pr_cont("OK\n"); | |
3284 | } | |
3285 | ||
3286 | /* Now test at the sub system level */ | |
3287 | ||
3288 | pr_info("Running tests on trace event systems:\n"); | |
3289 | ||
ae63b31e SR |
3290 | list_for_each_entry(dir, &tr->systems, list) { |
3291 | ||
3292 | system = dir->subsystem; | |
e6187007 SR |
3293 | |
3294 | /* the ftrace system is special, skip it */ | |
3295 | if (strcmp(system->name, "ftrace") == 0) | |
3296 | continue; | |
3297 | ||
3298 | pr_info("Testing event system %s: ", system->name); | |
3299 | ||
ae63b31e | 3300 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 3301 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3302 | pr_warn("error enabling system %s\n", |
3303 | system->name); | |
e6187007 SR |
3304 | continue; |
3305 | } | |
3306 | ||
3307 | event_test_stuff(); | |
3308 | ||
ae63b31e | 3309 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 3310 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3311 | pr_warn("error disabling system %s\n", |
3312 | system->name); | |
76bab1b7 YL |
3313 | continue; |
3314 | } | |
e6187007 SR |
3315 | |
3316 | pr_cont("OK\n"); | |
3317 | } | |
3318 | ||
3319 | /* Test with all events enabled */ | |
3320 | ||
3321 | pr_info("Running tests on all trace events:\n"); | |
3322 | pr_info("Testing all events: "); | |
3323 | ||
ae63b31e | 3324 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 3325 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3326 | pr_warn("error enabling all events\n"); |
9ea21c1e | 3327 | return; |
e6187007 SR |
3328 | } |
3329 | ||
3330 | event_test_stuff(); | |
3331 | ||
3332 | /* reset sysname */ | |
ae63b31e | 3333 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 3334 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3335 | pr_warn("error disabling all events\n"); |
9ea21c1e | 3336 | return; |
e6187007 SR |
3337 | } |
3338 | ||
3339 | pr_cont("OK\n"); | |
9ea21c1e SR |
3340 | } |
3341 | ||
3342 | #ifdef CONFIG_FUNCTION_TRACER | |
3343 | ||
245b2e70 | 3344 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e | 3345 | |
b7f0c959 SRRH |
3346 | static struct trace_array *event_tr; |
3347 | ||
3348 | static void __init | |
2f5f6ad9 | 3349 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 3350 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
3351 | { |
3352 | struct ring_buffer_event *event; | |
e77405ad | 3353 | struct ring_buffer *buffer; |
9ea21c1e SR |
3354 | struct ftrace_entry *entry; |
3355 | unsigned long flags; | |
3356 | long disabled; | |
9ea21c1e SR |
3357 | int cpu; |
3358 | int pc; | |
3359 | ||
3360 | pc = preempt_count(); | |
5168ae50 | 3361 | preempt_disable_notrace(); |
9ea21c1e | 3362 | cpu = raw_smp_processor_id(); |
245b2e70 | 3363 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
3364 | |
3365 | if (disabled != 1) | |
3366 | goto out; | |
3367 | ||
3368 | local_save_flags(flags); | |
3369 | ||
e77405ad SR |
3370 | event = trace_current_buffer_lock_reserve(&buffer, |
3371 | TRACE_FN, sizeof(*entry), | |
9ea21c1e SR |
3372 | flags, pc); |
3373 | if (!event) | |
3374 | goto out; | |
3375 | entry = ring_buffer_event_data(event); | |
3376 | entry->ip = ip; | |
3377 | entry->parent_ip = parent_ip; | |
3378 | ||
b7f0c959 | 3379 | trace_buffer_unlock_commit(event_tr, buffer, event, flags, pc); |
9ea21c1e SR |
3380 | |
3381 | out: | |
245b2e70 | 3382 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 3383 | preempt_enable_notrace(); |
9ea21c1e SR |
3384 | } |
3385 | ||
3386 | static struct ftrace_ops trace_ops __initdata = | |
3387 | { | |
3388 | .func = function_test_events_call, | |
4740974a | 3389 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
3390 | }; |
3391 | ||
3392 | static __init void event_trace_self_test_with_function(void) | |
3393 | { | |
17bb615a | 3394 | int ret; |
2d34f489 SRRH |
3395 | event_tr = top_trace_array(); |
3396 | if (WARN_ON(!event_tr)) | |
3397 | return; | |
17bb615a SR |
3398 | ret = register_ftrace_function(&trace_ops); |
3399 | if (WARN_ON(ret < 0)) { | |
3400 | pr_info("Failed to enable function tracer for event tests\n"); | |
3401 | return; | |
3402 | } | |
9ea21c1e SR |
3403 | pr_info("Running tests again, along with the function tracer\n"); |
3404 | event_trace_self_tests(); | |
3405 | unregister_ftrace_function(&trace_ops); | |
3406 | } | |
3407 | #else | |
3408 | static __init void event_trace_self_test_with_function(void) | |
3409 | { | |
3410 | } | |
3411 | #endif | |
3412 | ||
3413 | static __init int event_trace_self_tests_init(void) | |
3414 | { | |
020e5f85 LZ |
3415 | if (!tracing_selftest_disabled) { |
3416 | event_trace_self_tests(); | |
3417 | event_trace_self_test_with_function(); | |
3418 | } | |
e6187007 SR |
3419 | |
3420 | return 0; | |
3421 | } | |
3422 | ||
28d20e2d | 3423 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
3424 | |
3425 | #endif |