Commit | Line | Data |
---|---|---|
b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
3448bac3 FF |
11 | #define pr_fmt(fmt) fmt |
12 | ||
e6187007 SR |
13 | #include <linux/workqueue.h> |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/kthread.h> | |
8434dc93 | 16 | #include <linux/tracefs.h> |
b77e38aa SR |
17 | #include <linux/uaccess.h> |
18 | #include <linux/module.h> | |
19 | #include <linux/ctype.h> | |
49090107 | 20 | #include <linux/sort.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
e6187007 | 22 | #include <linux/delay.h> |
b77e38aa | 23 | |
3fdaf80f SRRH |
24 | #include <trace/events/sched.h> |
25 | ||
020e5f85 LZ |
26 | #include <asm/setup.h> |
27 | ||
91729ef9 | 28 | #include "trace_output.h" |
b77e38aa | 29 | |
4e5292ea | 30 | #undef TRACE_SYSTEM |
b628b3e6 SR |
31 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
32 | ||
20c8928a | 33 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 34 | |
a59fd602 | 35 | LIST_HEAD(ftrace_events); |
9f616680 | 36 | static LIST_HEAD(ftrace_generic_fields); |
b3a8c6fd | 37 | static LIST_HEAD(ftrace_common_fields); |
a59fd602 | 38 | |
d1a29143 SR |
39 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
40 | ||
41 | static struct kmem_cache *field_cachep; | |
42 | static struct kmem_cache *file_cachep; | |
43 | ||
6e94a780 SR |
44 | static inline int system_refcount(struct event_subsystem *system) |
45 | { | |
79ac6ef5 | 46 | return system->ref_count; |
6e94a780 SR |
47 | } |
48 | ||
49 | static int system_refcount_inc(struct event_subsystem *system) | |
50 | { | |
79ac6ef5 | 51 | return system->ref_count++; |
6e94a780 SR |
52 | } |
53 | ||
54 | static int system_refcount_dec(struct event_subsystem *system) | |
55 | { | |
79ac6ef5 | 56 | return --system->ref_count; |
6e94a780 SR |
57 | } |
58 | ||
ae63b31e SR |
59 | /* Double loops, do not use break, only goto's work */ |
60 | #define do_for_each_event_file(tr, file) \ | |
61 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
62 | list_for_each_entry(file, &tr->events, list) | |
63 | ||
64 | #define do_for_each_event_file_safe(tr, file) \ | |
65 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
7f1d2f82 | 66 | struct trace_event_file *___n; \ |
ae63b31e SR |
67 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
68 | ||
69 | #define while_for_each_event_file() \ | |
70 | } | |
71 | ||
b3a8c6fd | 72 | static struct list_head * |
2425bcb9 | 73 | trace_get_fields(struct trace_event_call *event_call) |
2e33af02 SR |
74 | { |
75 | if (!event_call->class->get_fields) | |
76 | return &event_call->class->fields; | |
77 | return event_call->class->get_fields(event_call); | |
78 | } | |
79 | ||
b3a8c6fd J |
80 | static struct ftrace_event_field * |
81 | __find_event_field(struct list_head *head, char *name) | |
82 | { | |
83 | struct ftrace_event_field *field; | |
84 | ||
85 | list_for_each_entry(field, head, link) { | |
86 | if (!strcmp(field->name, name)) | |
87 | return field; | |
88 | } | |
89 | ||
90 | return NULL; | |
91 | } | |
92 | ||
93 | struct ftrace_event_field * | |
2425bcb9 | 94 | trace_find_event_field(struct trace_event_call *call, char *name) |
b3a8c6fd J |
95 | { |
96 | struct ftrace_event_field *field; | |
97 | struct list_head *head; | |
98 | ||
e57cbaf0 SRRH |
99 | head = trace_get_fields(call); |
100 | field = __find_event_field(head, name); | |
9f616680 DW |
101 | if (field) |
102 | return field; | |
103 | ||
e57cbaf0 | 104 | field = __find_event_field(&ftrace_generic_fields, name); |
b3a8c6fd J |
105 | if (field) |
106 | return field; | |
107 | ||
e57cbaf0 | 108 | return __find_event_field(&ftrace_common_fields, name); |
b3a8c6fd J |
109 | } |
110 | ||
8728fe50 LZ |
111 | static int __trace_define_field(struct list_head *head, const char *type, |
112 | const char *name, int offset, int size, | |
113 | int is_signed, int filter_type) | |
cf027f64 TZ |
114 | { |
115 | struct ftrace_event_field *field; | |
116 | ||
d1a29143 | 117 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 118 | if (!field) |
aaf6ac0f | 119 | return -ENOMEM; |
fe9f57f2 | 120 | |
92edca07 SR |
121 | field->name = name; |
122 | field->type = type; | |
fe9f57f2 | 123 | |
43b51ead LZ |
124 | if (filter_type == FILTER_OTHER) |
125 | field->filter_type = filter_assign_type(type); | |
126 | else | |
127 | field->filter_type = filter_type; | |
128 | ||
cf027f64 TZ |
129 | field->offset = offset; |
130 | field->size = size; | |
a118e4d1 | 131 | field->is_signed = is_signed; |
aa38e9fc | 132 | |
2e33af02 | 133 | list_add(&field->link, head); |
cf027f64 TZ |
134 | |
135 | return 0; | |
cf027f64 | 136 | } |
8728fe50 | 137 | |
2425bcb9 | 138 | int trace_define_field(struct trace_event_call *call, const char *type, |
8728fe50 LZ |
139 | const char *name, int offset, int size, int is_signed, |
140 | int filter_type) | |
141 | { | |
142 | struct list_head *head; | |
143 | ||
144 | if (WARN_ON(!call->class)) | |
145 | return 0; | |
146 | ||
147 | head = trace_get_fields(call); | |
148 | return __trace_define_field(head, type, name, offset, size, | |
149 | is_signed, filter_type); | |
150 | } | |
17c873ec | 151 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 152 | |
9f616680 DW |
153 | #define __generic_field(type, item, filter_type) \ |
154 | ret = __trace_define_field(&ftrace_generic_fields, #type, \ | |
155 | #item, 0, 0, is_signed_type(type), \ | |
156 | filter_type); \ | |
157 | if (ret) \ | |
158 | return ret; | |
159 | ||
e647d6b3 | 160 | #define __common_field(type, item) \ |
8728fe50 LZ |
161 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
162 | "common_" #item, \ | |
163 | offsetof(typeof(ent), item), \ | |
164 | sizeof(ent.item), \ | |
165 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
166 | if (ret) \ |
167 | return ret; | |
168 | ||
9f616680 DW |
169 | static int trace_define_generic_fields(void) |
170 | { | |
171 | int ret; | |
172 | ||
e57cbaf0 SRRH |
173 | __generic_field(int, CPU, FILTER_CPU); |
174 | __generic_field(int, cpu, FILTER_CPU); | |
175 | __generic_field(char *, COMM, FILTER_COMM); | |
176 | __generic_field(char *, comm, FILTER_COMM); | |
9f616680 DW |
177 | |
178 | return ret; | |
179 | } | |
180 | ||
8728fe50 | 181 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
182 | { |
183 | int ret; | |
184 | struct trace_entry ent; | |
185 | ||
186 | __common_field(unsigned short, type); | |
187 | __common_field(unsigned char, flags); | |
188 | __common_field(unsigned char, preempt_count); | |
189 | __common_field(int, pid); | |
e647d6b3 LZ |
190 | |
191 | return ret; | |
192 | } | |
193 | ||
2425bcb9 | 194 | static void trace_destroy_fields(struct trace_event_call *call) |
2df75e41 LZ |
195 | { |
196 | struct ftrace_event_field *field, *next; | |
2e33af02 | 197 | struct list_head *head; |
2df75e41 | 198 | |
2e33af02 SR |
199 | head = trace_get_fields(call); |
200 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 201 | list_del(&field->link); |
d1a29143 | 202 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
203 | } |
204 | } | |
205 | ||
32bbe007 AS |
206 | /* |
207 | * run-time version of trace_event_get_offsets_<call>() that returns the last | |
208 | * accessible offset of trace fields excluding __dynamic_array bytes | |
209 | */ | |
210 | int trace_event_get_offsets(struct trace_event_call *call) | |
211 | { | |
212 | struct ftrace_event_field *tail; | |
213 | struct list_head *head; | |
214 | ||
215 | head = trace_get_fields(call); | |
216 | /* | |
217 | * head->next points to the last field with the largest offset, | |
218 | * since it was added last by trace_define_field() | |
219 | */ | |
220 | tail = list_first_entry(head, struct ftrace_event_field, link); | |
221 | return tail->offset + tail->size; | |
222 | } | |
223 | ||
2425bcb9 | 224 | int trace_event_raw_init(struct trace_event_call *call) |
87d9b4e1 LZ |
225 | { |
226 | int id; | |
227 | ||
9023c930 | 228 | id = register_trace_event(&call->event); |
87d9b4e1 LZ |
229 | if (!id) |
230 | return -ENODEV; | |
87d9b4e1 LZ |
231 | |
232 | return 0; | |
233 | } | |
234 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
235 | ||
3fdaf80f SRRH |
236 | bool trace_event_ignore_this_pid(struct trace_event_file *trace_file) |
237 | { | |
238 | struct trace_array *tr = trace_file->tr; | |
239 | struct trace_array_cpu *data; | |
240 | struct trace_pid_list *pid_list; | |
241 | ||
242 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
243 | if (!pid_list) | |
244 | return false; | |
245 | ||
246 | data = this_cpu_ptr(tr->trace_buffer.data); | |
247 | ||
248 | return data->ignore_pid; | |
249 | } | |
250 | EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid); | |
251 | ||
3f795dcf SRRH |
252 | void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, |
253 | struct trace_event_file *trace_file, | |
254 | unsigned long len) | |
3fd40d1e | 255 | { |
2425bcb9 | 256 | struct trace_event_call *event_call = trace_file->event_call; |
3fd40d1e | 257 | |
3fdaf80f SRRH |
258 | if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) && |
259 | trace_event_ignore_this_pid(trace_file)) | |
260 | return NULL; | |
261 | ||
3fd40d1e SR |
262 | local_save_flags(fbuffer->flags); |
263 | fbuffer->pc = preempt_count(); | |
e947841c SRRH |
264 | /* |
265 | * If CONFIG_PREEMPT is enabled, then the tracepoint itself disables | |
266 | * preemption (adding one to the preempt_count). Since we are | |
267 | * interested in the preempt_count at the time the tracepoint was | |
268 | * hit, we need to subtract one to offset the increment. | |
269 | */ | |
270 | if (IS_ENABLED(CONFIG_PREEMPT)) | |
271 | fbuffer->pc--; | |
7f1d2f82 | 272 | fbuffer->trace_file = trace_file; |
3fd40d1e SR |
273 | |
274 | fbuffer->event = | |
7f1d2f82 | 275 | trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, |
3fd40d1e SR |
276 | event_call->event.type, len, |
277 | fbuffer->flags, fbuffer->pc); | |
278 | if (!fbuffer->event) | |
279 | return NULL; | |
280 | ||
281 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); | |
282 | return fbuffer->entry; | |
283 | } | |
3f795dcf | 284 | EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); |
3fd40d1e | 285 | |
2425bcb9 | 286 | int trace_event_reg(struct trace_event_call *call, |
9023c930 | 287 | enum trace_reg type, void *data) |
a1d0ce82 | 288 | { |
7f1d2f82 | 289 | struct trace_event_file *file = data; |
ae63b31e | 290 | |
de7b2973 | 291 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
a1d0ce82 SR |
292 | switch (type) { |
293 | case TRACE_REG_REGISTER: | |
de7b2973 | 294 | return tracepoint_probe_register(call->tp, |
a1d0ce82 | 295 | call->class->probe, |
ae63b31e | 296 | file); |
a1d0ce82 | 297 | case TRACE_REG_UNREGISTER: |
de7b2973 | 298 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 | 299 | call->class->probe, |
ae63b31e | 300 | file); |
a1d0ce82 SR |
301 | return 0; |
302 | ||
303 | #ifdef CONFIG_PERF_EVENTS | |
304 | case TRACE_REG_PERF_REGISTER: | |
de7b2973 | 305 | return tracepoint_probe_register(call->tp, |
a1d0ce82 SR |
306 | call->class->perf_probe, |
307 | call); | |
308 | case TRACE_REG_PERF_UNREGISTER: | |
de7b2973 | 309 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 SR |
310 | call->class->perf_probe, |
311 | call); | |
312 | return 0; | |
ceec0b6f JO |
313 | case TRACE_REG_PERF_OPEN: |
314 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
315 | case TRACE_REG_PERF_ADD: |
316 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 317 | return 0; |
a1d0ce82 SR |
318 | #endif |
319 | } | |
320 | return 0; | |
321 | } | |
9023c930 | 322 | EXPORT_SYMBOL_GPL(trace_event_reg); |
a1d0ce82 | 323 | |
e870e9a1 LZ |
324 | void trace_event_enable_cmd_record(bool enable) |
325 | { | |
7f1d2f82 | 326 | struct trace_event_file *file; |
ae63b31e | 327 | struct trace_array *tr; |
e870e9a1 LZ |
328 | |
329 | mutex_lock(&event_mutex); | |
ae63b31e SR |
330 | do_for_each_event_file(tr, file) { |
331 | ||
5d6ad960 | 332 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) |
e870e9a1 LZ |
333 | continue; |
334 | ||
335 | if (enable) { | |
336 | tracing_start_cmdline_record(); | |
5d6ad960 | 337 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
338 | } else { |
339 | tracing_stop_cmdline_record(); | |
5d6ad960 | 340 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 341 | } |
ae63b31e | 342 | } while_for_each_event_file(); |
e870e9a1 LZ |
343 | mutex_unlock(&event_mutex); |
344 | } | |
345 | ||
d914ba37 JF |
346 | void trace_event_enable_tgid_record(bool enable) |
347 | { | |
348 | struct trace_event_file *file; | |
349 | struct trace_array *tr; | |
350 | ||
351 | mutex_lock(&event_mutex); | |
352 | do_for_each_event_file(tr, file) { | |
353 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) | |
354 | continue; | |
355 | ||
356 | if (enable) { | |
357 | tracing_start_tgid_record(); | |
358 | set_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); | |
359 | } else { | |
360 | tracing_stop_tgid_record(); | |
361 | clear_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, | |
362 | &file->flags); | |
363 | } | |
364 | } while_for_each_event_file(); | |
365 | mutex_unlock(&event_mutex); | |
366 | } | |
367 | ||
7f1d2f82 | 368 | static int __ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 | 369 | int enable, int soft_disable) |
fd994989 | 370 | { |
2425bcb9 | 371 | struct trace_event_call *call = file->event_call; |
983f938a | 372 | struct trace_array *tr = file->tr; |
0fc1b09f | 373 | unsigned long file_flags = file->flags; |
3b8e4273 | 374 | int ret = 0; |
417944c4 | 375 | int disable; |
3b8e4273 | 376 | |
fd994989 SR |
377 | switch (enable) { |
378 | case 0: | |
417944c4 | 379 | /* |
1cf4c073 MH |
380 | * When soft_disable is set and enable is cleared, the sm_ref |
381 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
382 | * to clear the SOFT_DISABLED flag but leave the event in the |
383 | * state that it was. That is, if the event was enabled and | |
384 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
385 | * is set we do not want the event to be enabled before we | |
386 | * clear the bit. | |
387 | * | |
388 | * When soft_disable is not set but the SOFT_MODE flag is, | |
389 | * we do nothing. Do not disable the tracepoint, otherwise | |
390 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
391 | */ | |
392 | if (soft_disable) { | |
1cf4c073 MH |
393 | if (atomic_dec_return(&file->sm_ref) > 0) |
394 | break; | |
5d6ad960 SRRH |
395 | disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; |
396 | clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); | |
417944c4 | 397 | } else |
5d6ad960 | 398 | disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); |
417944c4 | 399 | |
5d6ad960 SRRH |
400 | if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { |
401 | clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); | |
402 | if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { | |
e870e9a1 | 403 | tracing_stop_cmdline_record(); |
5d6ad960 | 404 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 405 | } |
d914ba37 JF |
406 | |
407 | if (file->flags & EVENT_FILE_FL_RECORDED_TGID) { | |
408 | tracing_stop_tgid_record(); | |
7685ab6c | 409 | clear_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); |
d914ba37 JF |
410 | } |
411 | ||
ae63b31e | 412 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 413 | } |
3baa5e4c | 414 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
5d6ad960 SRRH |
415 | if (file->flags & EVENT_FILE_FL_SOFT_MODE) |
416 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c | 417 | else |
5d6ad960 | 418 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
fd994989 SR |
419 | break; |
420 | case 1: | |
417944c4 SRRH |
421 | /* |
422 | * When soft_disable is set and enable is set, we want to | |
423 | * register the tracepoint for the event, but leave the event | |
424 | * as is. That means, if the event was already enabled, we do | |
425 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
426 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
427 | * it still seems to be disabled. | |
428 | */ | |
429 | if (!soft_disable) | |
5d6ad960 | 430 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
1cf4c073 MH |
431 | else { |
432 | if (atomic_inc_return(&file->sm_ref) > 1) | |
433 | break; | |
5d6ad960 | 434 | set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 435 | } |
417944c4 | 436 | |
5d6ad960 | 437 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) { |
d914ba37 | 438 | bool cmd = false, tgid = false; |
417944c4 SRRH |
439 | |
440 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
441 | if (soft_disable) | |
5d6ad960 | 442 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
417944c4 | 443 | |
983f938a | 444 | if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { |
d914ba37 | 445 | cmd = true; |
e870e9a1 | 446 | tracing_start_cmdline_record(); |
5d6ad960 | 447 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 448 | } |
d914ba37 JF |
449 | |
450 | if (tr->trace_flags & TRACE_ITER_RECORD_TGID) { | |
451 | tgid = true; | |
452 | tracing_start_tgid_record(); | |
453 | set_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); | |
454 | } | |
455 | ||
ae63b31e | 456 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 | 457 | if (ret) { |
d914ba37 JF |
458 | if (cmd) |
459 | tracing_stop_cmdline_record(); | |
460 | if (tgid) | |
461 | tracing_stop_tgid_record(); | |
3b8e4273 | 462 | pr_info("event trace: Could not enable event " |
687fcc4a | 463 | "%s\n", trace_event_name(call)); |
3b8e4273 LZ |
464 | break; |
465 | } | |
5d6ad960 | 466 | set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
467 | |
468 | /* WAS_ENABLED gets set but never cleared. */ | |
065e63f9 | 469 | set_bit(EVENT_FILE_FL_WAS_ENABLED_BIT, &file->flags); |
fd994989 | 470 | } |
fd994989 SR |
471 | break; |
472 | } | |
3b8e4273 | 473 | |
0fc1b09f SRRH |
474 | /* Enable or disable use of trace_buffered_event */ |
475 | if ((file_flags & EVENT_FILE_FL_SOFT_DISABLED) != | |
476 | (file->flags & EVENT_FILE_FL_SOFT_DISABLED)) { | |
477 | if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) | |
478 | trace_buffered_event_enable(); | |
479 | else | |
480 | trace_buffered_event_disable(); | |
481 | } | |
482 | ||
3b8e4273 | 483 | return ret; |
fd994989 SR |
484 | } |
485 | ||
7f1d2f82 | 486 | int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 TZ |
487 | int enable, int soft_disable) |
488 | { | |
489 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
490 | } | |
491 | ||
7f1d2f82 | 492 | static int ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 SRRH |
493 | int enable) |
494 | { | |
495 | return __ftrace_event_enable_disable(file, enable, 0); | |
496 | } | |
497 | ||
ae63b31e | 498 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 499 | { |
7f1d2f82 | 500 | struct trace_event_file *file; |
0e907c99 Z |
501 | |
502 | mutex_lock(&event_mutex); | |
ae63b31e SR |
503 | list_for_each_entry(file, &tr->events, list) { |
504 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
505 | } |
506 | mutex_unlock(&event_mutex); | |
507 | } | |
508 | ||
c37775d5 SR |
509 | static void |
510 | event_filter_pid_sched_process_exit(void *data, struct task_struct *task) | |
511 | { | |
512 | struct trace_pid_list *pid_list; | |
513 | struct trace_array *tr = data; | |
514 | ||
515 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
4e267db1 | 516 | trace_filter_add_remove_task(pid_list, NULL, task); |
c37775d5 SR |
517 | } |
518 | ||
519 | static void | |
520 | event_filter_pid_sched_process_fork(void *data, | |
521 | struct task_struct *self, | |
522 | struct task_struct *task) | |
523 | { | |
524 | struct trace_pid_list *pid_list; | |
525 | struct trace_array *tr = data; | |
526 | ||
527 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
4e267db1 | 528 | trace_filter_add_remove_task(pid_list, self, task); |
c37775d5 SR |
529 | } |
530 | ||
531 | void trace_event_follow_fork(struct trace_array *tr, bool enable) | |
532 | { | |
533 | if (enable) { | |
534 | register_trace_prio_sched_process_fork(event_filter_pid_sched_process_fork, | |
535 | tr, INT_MIN); | |
536 | register_trace_prio_sched_process_exit(event_filter_pid_sched_process_exit, | |
537 | tr, INT_MAX); | |
538 | } else { | |
539 | unregister_trace_sched_process_fork(event_filter_pid_sched_process_fork, | |
540 | tr); | |
541 | unregister_trace_sched_process_exit(event_filter_pid_sched_process_exit, | |
542 | tr); | |
543 | } | |
3fdaf80f SRRH |
544 | } |
545 | ||
546 | static void | |
22402cd0 | 547 | event_filter_pid_sched_switch_probe_pre(void *data, bool preempt, |
3fdaf80f SRRH |
548 | struct task_struct *prev, struct task_struct *next) |
549 | { | |
550 | struct trace_array *tr = data; | |
551 | struct trace_pid_list *pid_list; | |
552 | ||
553 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
554 | ||
555 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 SR |
556 | trace_ignore_this_task(pid_list, prev) && |
557 | trace_ignore_this_task(pid_list, next)); | |
3fdaf80f SRRH |
558 | } |
559 | ||
560 | static void | |
22402cd0 | 561 | event_filter_pid_sched_switch_probe_post(void *data, bool preempt, |
3fdaf80f SRRH |
562 | struct task_struct *prev, struct task_struct *next) |
563 | { | |
564 | struct trace_array *tr = data; | |
565 | struct trace_pid_list *pid_list; | |
566 | ||
567 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
568 | ||
569 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 570 | trace_ignore_this_task(pid_list, next)); |
3fdaf80f SRRH |
571 | } |
572 | ||
573 | static void | |
574 | event_filter_pid_sched_wakeup_probe_pre(void *data, struct task_struct *task) | |
575 | { | |
576 | struct trace_array *tr = data; | |
577 | struct trace_pid_list *pid_list; | |
578 | ||
579 | /* Nothing to do if we are already tracing */ | |
580 | if (!this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
581 | return; | |
582 | ||
583 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
584 | ||
585 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 586 | trace_ignore_this_task(pid_list, task)); |
3fdaf80f SRRH |
587 | } |
588 | ||
589 | static void | |
590 | event_filter_pid_sched_wakeup_probe_post(void *data, struct task_struct *task) | |
591 | { | |
592 | struct trace_array *tr = data; | |
593 | struct trace_pid_list *pid_list; | |
594 | ||
595 | /* Nothing to do if we are not tracing */ | |
596 | if (this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
597 | return; | |
598 | ||
599 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
600 | ||
601 | /* Set tracing if current is enabled */ | |
602 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 603 | trace_ignore_this_task(pid_list, current)); |
3fdaf80f SRRH |
604 | } |
605 | ||
49090107 SRRH |
606 | static void __ftrace_clear_event_pids(struct trace_array *tr) |
607 | { | |
608 | struct trace_pid_list *pid_list; | |
3fdaf80f SRRH |
609 | struct trace_event_file *file; |
610 | int cpu; | |
49090107 SRRH |
611 | |
612 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
613 | lockdep_is_held(&event_mutex)); | |
614 | if (!pid_list) | |
615 | return; | |
616 | ||
3fdaf80f SRRH |
617 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_pre, tr); |
618 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_post, tr); | |
619 | ||
620 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, tr); | |
621 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, tr); | |
622 | ||
0f72e37e SRRH |
623 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, tr); |
624 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, tr); | |
625 | ||
626 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_pre, tr); | |
627 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_post, tr); | |
628 | ||
3fdaf80f SRRH |
629 | list_for_each_entry(file, &tr->events, list) { |
630 | clear_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
631 | } | |
632 | ||
633 | for_each_possible_cpu(cpu) | |
634 | per_cpu_ptr(tr->trace_buffer.data, cpu)->ignore_pid = false; | |
635 | ||
49090107 SRRH |
636 | rcu_assign_pointer(tr->filtered_pids, NULL); |
637 | ||
638 | /* Wait till all users are no longer using pid filtering */ | |
639 | synchronize_sched(); | |
640 | ||
76c813e2 | 641 | trace_free_pid_list(pid_list); |
49090107 SRRH |
642 | } |
643 | ||
644 | static void ftrace_clear_event_pids(struct trace_array *tr) | |
645 | { | |
646 | mutex_lock(&event_mutex); | |
647 | __ftrace_clear_event_pids(tr); | |
648 | mutex_unlock(&event_mutex); | |
649 | } | |
650 | ||
e9dbfae5 SR |
651 | static void __put_system(struct event_subsystem *system) |
652 | { | |
653 | struct event_filter *filter = system->filter; | |
654 | ||
6e94a780 SR |
655 | WARN_ON_ONCE(system_refcount(system) == 0); |
656 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
657 | return; |
658 | ||
ae63b31e SR |
659 | list_del(&system->list); |
660 | ||
e9dbfae5 SR |
661 | if (filter) { |
662 | kfree(filter->filter_string); | |
663 | kfree(filter); | |
664 | } | |
79ac6ef5 | 665 | kfree_const(system->name); |
e9dbfae5 SR |
666 | kfree(system); |
667 | } | |
668 | ||
669 | static void __get_system(struct event_subsystem *system) | |
670 | { | |
6e94a780 SR |
671 | WARN_ON_ONCE(system_refcount(system) == 0); |
672 | system_refcount_inc(system); | |
e9dbfae5 SR |
673 | } |
674 | ||
7967b3e0 | 675 | static void __get_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
676 | { |
677 | WARN_ON_ONCE(dir->ref_count == 0); | |
678 | dir->ref_count++; | |
679 | __get_system(dir->subsystem); | |
680 | } | |
681 | ||
7967b3e0 | 682 | static void __put_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
683 | { |
684 | WARN_ON_ONCE(dir->ref_count == 0); | |
685 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 686 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
687 | |
688 | __put_system(dir->subsystem); | |
689 | if (!--dir->ref_count) | |
690 | kfree(dir); | |
691 | } | |
692 | ||
7967b3e0 | 693 | static void put_system(struct trace_subsystem_dir *dir) |
e9dbfae5 SR |
694 | { |
695 | mutex_lock(&event_mutex); | |
ae63b31e | 696 | __put_system_dir(dir); |
e9dbfae5 SR |
697 | mutex_unlock(&event_mutex); |
698 | } | |
699 | ||
7967b3e0 | 700 | static void remove_subsystem(struct trace_subsystem_dir *dir) |
f6a84bdc ON |
701 | { |
702 | if (!dir) | |
703 | return; | |
704 | ||
705 | if (!--dir->nr_events) { | |
8434dc93 | 706 | tracefs_remove_recursive(dir->entry); |
f6a84bdc ON |
707 | list_del(&dir->list); |
708 | __put_system_dir(dir); | |
709 | } | |
710 | } | |
711 | ||
7f1d2f82 | 712 | static void remove_event_file_dir(struct trace_event_file *file) |
f6a84bdc | 713 | { |
bf682c31 ON |
714 | struct dentry *dir = file->dir; |
715 | struct dentry *child; | |
716 | ||
717 | if (dir) { | |
718 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
946e51f2 | 719 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
7682c918 DH |
720 | if (d_really_is_positive(child)) /* probably unneeded */ |
721 | d_inode(child)->i_private = NULL; | |
bf682c31 ON |
722 | } |
723 | spin_unlock(&dir->d_lock); | |
724 | ||
8434dc93 | 725 | tracefs_remove_recursive(dir); |
bf682c31 ON |
726 | } |
727 | ||
f6a84bdc | 728 | list_del(&file->list); |
f6a84bdc | 729 | remove_subsystem(file->system); |
2448e349 | 730 | free_event_filter(file->filter); |
f6a84bdc ON |
731 | kmem_cache_free(file_cachep, file); |
732 | } | |
733 | ||
8f31bfe5 LZ |
734 | /* |
735 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
736 | */ | |
2a6c24af SRRH |
737 | static int |
738 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
739 | const char *sub, const char *event, int set) | |
b77e38aa | 740 | { |
7f1d2f82 | 741 | struct trace_event_file *file; |
2425bcb9 | 742 | struct trace_event_call *call; |
de7b2973 | 743 | const char *name; |
29f93943 | 744 | int ret = -EINVAL; |
989a0a3d | 745 | int eret = 0; |
8f31bfe5 | 746 | |
ae63b31e SR |
747 | list_for_each_entry(file, &tr->events, list) { |
748 | ||
749 | call = file->event_call; | |
687fcc4a | 750 | name = trace_event_name(call); |
8f31bfe5 | 751 | |
de7b2973 | 752 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
753 | continue; |
754 | ||
9b63776f SR |
755 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
756 | continue; | |
757 | ||
8f31bfe5 | 758 | if (match && |
de7b2973 | 759 | strcmp(match, name) != 0 && |
8f082018 | 760 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
761 | continue; |
762 | ||
8f082018 | 763 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
764 | continue; |
765 | ||
de7b2973 | 766 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
767 | continue; |
768 | ||
989a0a3d | 769 | ret = ftrace_event_enable_disable(file, set); |
8f31bfe5 | 770 | |
989a0a3d SRRH |
771 | /* |
772 | * Save the first error and return that. Some events | |
773 | * may still have been enabled, but let the user | |
774 | * know that something went wrong. | |
775 | */ | |
776 | if (ret && !eret) | |
777 | eret = ret; | |
778 | ||
779 | ret = eret; | |
8f31bfe5 | 780 | } |
2a6c24af SRRH |
781 | |
782 | return ret; | |
783 | } | |
784 | ||
785 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
786 | const char *sub, const char *event, int set) | |
787 | { | |
788 | int ret; | |
789 | ||
790 | mutex_lock(&event_mutex); | |
791 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
792 | mutex_unlock(&event_mutex); |
793 | ||
794 | return ret; | |
795 | } | |
796 | ||
ae63b31e | 797 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 798 | { |
b628b3e6 | 799 | char *event = NULL, *sub = NULL, *match; |
84fce9db | 800 | int ret; |
b628b3e6 SR |
801 | |
802 | /* | |
803 | * The buf format can be <subsystem>:<event-name> | |
804 | * *:<event-name> means any event by that name. | |
805 | * :<event-name> is the same. | |
806 | * | |
807 | * <subsystem>:* means all events in that subsystem | |
808 | * <subsystem>: means the same. | |
809 | * | |
810 | * <name> (no ':') means all events in a subsystem with | |
811 | * the name <name> or any event that matches <name> | |
812 | */ | |
813 | ||
814 | match = strsep(&buf, ":"); | |
815 | if (buf) { | |
816 | sub = match; | |
817 | event = buf; | |
818 | match = NULL; | |
819 | ||
820 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
821 | sub = NULL; | |
822 | if (!strlen(event) || strcmp(event, "*") == 0) | |
823 | event = NULL; | |
824 | } | |
b77e38aa | 825 | |
84fce9db JK |
826 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
827 | ||
828 | /* Put back the colon to allow this to be called again */ | |
829 | if (buf) | |
830 | *(buf - 1) = ':'; | |
831 | ||
832 | return ret; | |
b77e38aa SR |
833 | } |
834 | ||
4671c794 SR |
835 | /** |
836 | * trace_set_clr_event - enable or disable an event | |
837 | * @system: system name to match (NULL for any system) | |
838 | * @event: event name to match (NULL for all events, within system) | |
839 | * @set: 1 to enable, 0 to disable | |
840 | * | |
841 | * This is a way for other parts of the kernel to enable or disable | |
842 | * event recording. | |
843 | * | |
844 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
845 | * registered events. | |
846 | */ | |
847 | int trace_set_clr_event(const char *system, const char *event, int set) | |
848 | { | |
ae63b31e SR |
849 | struct trace_array *tr = top_trace_array(); |
850 | ||
dc81e5e3 YY |
851 | if (!tr) |
852 | return -ENODEV; | |
853 | ||
ae63b31e | 854 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 855 | } |
56355b83 | 856 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 857 | |
b77e38aa SR |
858 | /* 128 should be much more than enough */ |
859 | #define EVENT_BUF_SIZE 127 | |
860 | ||
861 | static ssize_t | |
862 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
863 | size_t cnt, loff_t *ppos) | |
864 | { | |
48966364 | 865 | struct trace_parser parser; |
ae63b31e SR |
866 | struct seq_file *m = file->private_data; |
867 | struct trace_array *tr = m->private; | |
4ba7978e | 868 | ssize_t read, ret; |
b77e38aa | 869 | |
4ba7978e | 870 | if (!cnt) |
b77e38aa SR |
871 | return 0; |
872 | ||
1852fcce SR |
873 | ret = tracing_update_buffers(); |
874 | if (ret < 0) | |
875 | return ret; | |
876 | ||
48966364 | 877 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
878 | return -ENOMEM; |
879 | ||
48966364 | 880 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
881 | ||
4ba7978e | 882 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 883 | int set = 1; |
b77e38aa | 884 | |
48966364 | 885 | if (*parser.buffer == '!') |
b77e38aa | 886 | set = 0; |
b77e38aa | 887 | |
48966364 | 888 | parser.buffer[parser.idx] = 0; |
889 | ||
ae63b31e | 890 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 891 | if (ret) |
48966364 | 892 | goto out_put; |
b77e38aa | 893 | } |
b77e38aa SR |
894 | |
895 | ret = read; | |
896 | ||
48966364 | 897 | out_put: |
898 | trace_parser_put(&parser); | |
b77e38aa SR |
899 | |
900 | return ret; | |
901 | } | |
902 | ||
903 | static void * | |
904 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
905 | { | |
7f1d2f82 | 906 | struct trace_event_file *file = v; |
2425bcb9 | 907 | struct trace_event_call *call; |
ae63b31e | 908 | struct trace_array *tr = m->private; |
b77e38aa SR |
909 | |
910 | (*pos)++; | |
911 | ||
ae63b31e SR |
912 | list_for_each_entry_continue(file, &tr->events, list) { |
913 | call = file->event_call; | |
40e26815 SR |
914 | /* |
915 | * The ftrace subsystem is for showing formats only. | |
916 | * They can not be enabled or disabled via the event files. | |
917 | */ | |
d045437a SRRH |
918 | if (call->class && call->class->reg && |
919 | !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
ae63b31e | 920 | return file; |
40e26815 | 921 | } |
b77e38aa | 922 | |
30bd39cd | 923 | return NULL; |
b77e38aa SR |
924 | } |
925 | ||
926 | static void *t_start(struct seq_file *m, loff_t *pos) | |
927 | { | |
7f1d2f82 | 928 | struct trace_event_file *file; |
ae63b31e | 929 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
930 | loff_t l; |
931 | ||
20c8928a | 932 | mutex_lock(&event_mutex); |
e1c7e2a6 | 933 | |
7f1d2f82 | 934 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 935 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
936 | file = t_next(m, file, &l); |
937 | if (!file) | |
e1c7e2a6 LZ |
938 | break; |
939 | } | |
ae63b31e | 940 | return file; |
b77e38aa SR |
941 | } |
942 | ||
943 | static void * | |
944 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
945 | { | |
7f1d2f82 | 946 | struct trace_event_file *file = v; |
ae63b31e | 947 | struct trace_array *tr = m->private; |
b77e38aa SR |
948 | |
949 | (*pos)++; | |
950 | ||
ae63b31e | 951 | list_for_each_entry_continue(file, &tr->events, list) { |
5d6ad960 | 952 | if (file->flags & EVENT_FILE_FL_ENABLED) |
ae63b31e | 953 | return file; |
b77e38aa SR |
954 | } |
955 | ||
30bd39cd | 956 | return NULL; |
b77e38aa SR |
957 | } |
958 | ||
959 | static void *s_start(struct seq_file *m, loff_t *pos) | |
960 | { | |
7f1d2f82 | 961 | struct trace_event_file *file; |
ae63b31e | 962 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
963 | loff_t l; |
964 | ||
20c8928a | 965 | mutex_lock(&event_mutex); |
e1c7e2a6 | 966 | |
7f1d2f82 | 967 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 968 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
969 | file = s_next(m, file, &l); |
970 | if (!file) | |
e1c7e2a6 LZ |
971 | break; |
972 | } | |
ae63b31e | 973 | return file; |
b77e38aa SR |
974 | } |
975 | ||
976 | static int t_show(struct seq_file *m, void *v) | |
977 | { | |
7f1d2f82 | 978 | struct trace_event_file *file = v; |
2425bcb9 | 979 | struct trace_event_call *call = file->event_call; |
b77e38aa | 980 | |
8f082018 SR |
981 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
982 | seq_printf(m, "%s:", call->class->system); | |
687fcc4a | 983 | seq_printf(m, "%s\n", trace_event_name(call)); |
b77e38aa SR |
984 | |
985 | return 0; | |
986 | } | |
987 | ||
988 | static void t_stop(struct seq_file *m, void *p) | |
989 | { | |
20c8928a | 990 | mutex_unlock(&event_mutex); |
b77e38aa SR |
991 | } |
992 | ||
f4d34a87 SR |
993 | static void * |
994 | p_next(struct seq_file *m, void *v, loff_t *pos) | |
995 | { | |
996 | struct trace_array *tr = m->private; | |
997 | struct trace_pid_list *pid_list = rcu_dereference_sched(tr->filtered_pids); | |
f4d34a87 | 998 | |
5cc8976b | 999 | return trace_pid_next(pid_list, v, pos); |
f4d34a87 SR |
1000 | } |
1001 | ||
49090107 | 1002 | static void *p_start(struct seq_file *m, loff_t *pos) |
fb662288 | 1003 | __acquires(RCU) |
49090107 SRRH |
1004 | { |
1005 | struct trace_pid_list *pid_list; | |
1006 | struct trace_array *tr = m->private; | |
1007 | ||
1008 | /* | |
1009 | * Grab the mutex, to keep calls to p_next() having the same | |
1010 | * tr->filtered_pids as p_start() has. | |
1011 | * If we just passed the tr->filtered_pids around, then RCU would | |
1012 | * have been enough, but doing that makes things more complex. | |
1013 | */ | |
1014 | mutex_lock(&event_mutex); | |
1015 | rcu_read_lock_sched(); | |
1016 | ||
1017 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1018 | ||
f4d34a87 | 1019 | if (!pid_list) |
49090107 SRRH |
1020 | return NULL; |
1021 | ||
5cc8976b | 1022 | return trace_pid_start(pid_list, pos); |
49090107 SRRH |
1023 | } |
1024 | ||
1025 | static void p_stop(struct seq_file *m, void *p) | |
fb662288 | 1026 | __releases(RCU) |
49090107 SRRH |
1027 | { |
1028 | rcu_read_unlock_sched(); | |
1029 | mutex_unlock(&event_mutex); | |
1030 | } | |
1031 | ||
1473e441 SR |
1032 | static ssize_t |
1033 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1034 | loff_t *ppos) | |
1035 | { | |
7f1d2f82 | 1036 | struct trace_event_file *file; |
bc6f6b08 | 1037 | unsigned long flags; |
a4390596 TZ |
1038 | char buf[4] = "0"; |
1039 | ||
bc6f6b08 ON |
1040 | mutex_lock(&event_mutex); |
1041 | file = event_file_data(filp); | |
1042 | if (likely(file)) | |
1043 | flags = file->flags; | |
1044 | mutex_unlock(&event_mutex); | |
1045 | ||
1046 | if (!file) | |
1047 | return -ENODEV; | |
1048 | ||
5d6ad960 SRRH |
1049 | if (flags & EVENT_FILE_FL_ENABLED && |
1050 | !(flags & EVENT_FILE_FL_SOFT_DISABLED)) | |
a4390596 TZ |
1051 | strcpy(buf, "1"); |
1052 | ||
5d6ad960 SRRH |
1053 | if (flags & EVENT_FILE_FL_SOFT_DISABLED || |
1054 | flags & EVENT_FILE_FL_SOFT_MODE) | |
a4390596 TZ |
1055 | strcat(buf, "*"); |
1056 | ||
1057 | strcat(buf, "\n"); | |
1473e441 | 1058 | |
417944c4 | 1059 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
1060 | } |
1061 | ||
1062 | static ssize_t | |
1063 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1064 | loff_t *ppos) | |
1065 | { | |
7f1d2f82 | 1066 | struct trace_event_file *file; |
1473e441 SR |
1067 | unsigned long val; |
1068 | int ret; | |
1069 | ||
22fe9b54 PH |
1070 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1071 | if (ret) | |
1473e441 SR |
1072 | return ret; |
1073 | ||
1852fcce SR |
1074 | ret = tracing_update_buffers(); |
1075 | if (ret < 0) | |
1076 | return ret; | |
1077 | ||
1473e441 SR |
1078 | switch (val) { |
1079 | case 0: | |
1473e441 | 1080 | case 1: |
bc6f6b08 | 1081 | ret = -ENODEV; |
11a241a3 | 1082 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
1083 | file = event_file_data(filp); |
1084 | if (likely(file)) | |
1085 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 1086 | mutex_unlock(&event_mutex); |
1473e441 SR |
1087 | break; |
1088 | ||
1089 | default: | |
1090 | return -EINVAL; | |
1091 | } | |
1092 | ||
1093 | *ppos += cnt; | |
1094 | ||
3b8e4273 | 1095 | return ret ? ret : cnt; |
1473e441 SR |
1096 | } |
1097 | ||
8ae79a13 SR |
1098 | static ssize_t |
1099 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1100 | loff_t *ppos) | |
1101 | { | |
c142b15d | 1102 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
7967b3e0 | 1103 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1104 | struct event_subsystem *system = dir->subsystem; |
2425bcb9 | 1105 | struct trace_event_call *call; |
7f1d2f82 | 1106 | struct trace_event_file *file; |
ae63b31e | 1107 | struct trace_array *tr = dir->tr; |
8ae79a13 | 1108 | char buf[2]; |
c142b15d | 1109 | int set = 0; |
8ae79a13 SR |
1110 | int ret; |
1111 | ||
8ae79a13 | 1112 | mutex_lock(&event_mutex); |
ae63b31e SR |
1113 | list_for_each_entry(file, &tr->events, list) { |
1114 | call = file->event_call; | |
687fcc4a | 1115 | if (!trace_event_name(call) || !call->class || !call->class->reg) |
8ae79a13 SR |
1116 | continue; |
1117 | ||
40ee4dff | 1118 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
1119 | continue; |
1120 | ||
1121 | /* | |
1122 | * We need to find out if all the events are set | |
1123 | * or if all events or cleared, or if we have | |
1124 | * a mixture. | |
1125 | */ | |
5d6ad960 | 1126 | set |= (1 << !!(file->flags & EVENT_FILE_FL_ENABLED)); |
c142b15d | 1127 | |
8ae79a13 SR |
1128 | /* |
1129 | * If we have a mixture, no need to look further. | |
1130 | */ | |
c142b15d | 1131 | if (set == 3) |
8ae79a13 SR |
1132 | break; |
1133 | } | |
1134 | mutex_unlock(&event_mutex); | |
1135 | ||
c142b15d | 1136 | buf[0] = set_to_char[set]; |
8ae79a13 | 1137 | buf[1] = '\n'; |
8ae79a13 SR |
1138 | |
1139 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
1140 | ||
1141 | return ret; | |
1142 | } | |
1143 | ||
1144 | static ssize_t | |
1145 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1146 | loff_t *ppos) | |
1147 | { | |
7967b3e0 | 1148 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1149 | struct event_subsystem *system = dir->subsystem; |
40ee4dff | 1150 | const char *name = NULL; |
8ae79a13 | 1151 | unsigned long val; |
8ae79a13 SR |
1152 | ssize_t ret; |
1153 | ||
22fe9b54 PH |
1154 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1155 | if (ret) | |
8ae79a13 SR |
1156 | return ret; |
1157 | ||
1158 | ret = tracing_update_buffers(); | |
1159 | if (ret < 0) | |
1160 | return ret; | |
1161 | ||
8f31bfe5 | 1162 | if (val != 0 && val != 1) |
8ae79a13 | 1163 | return -EINVAL; |
8ae79a13 | 1164 | |
40ee4dff SR |
1165 | /* |
1166 | * Opening of "enable" adds a ref count to system, | |
1167 | * so the name is safe to use. | |
1168 | */ | |
1169 | if (system) | |
1170 | name = system->name; | |
1171 | ||
ae63b31e | 1172 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 1173 | if (ret) |
8f31bfe5 | 1174 | goto out; |
8ae79a13 SR |
1175 | |
1176 | ret = cnt; | |
1177 | ||
8f31bfe5 | 1178 | out: |
8ae79a13 SR |
1179 | *ppos += cnt; |
1180 | ||
1181 | return ret; | |
1182 | } | |
1183 | ||
2a37a3df SR |
1184 | enum { |
1185 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
1186 | FORMAT_FIELD_SEPERATOR = 2, |
1187 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
1188 | }; |
1189 | ||
1190 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 1191 | { |
2425bcb9 | 1192 | struct trace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
1193 | struct list_head *common_head = &ftrace_common_fields; |
1194 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 1195 | struct list_head *node = v; |
981d081e | 1196 | |
2a37a3df | 1197 | (*pos)++; |
5a65e956 | 1198 | |
2a37a3df SR |
1199 | switch ((unsigned long)v) { |
1200 | case FORMAT_HEADER: | |
7710b639 ON |
1201 | node = common_head; |
1202 | break; | |
5a65e956 | 1203 | |
86397dc3 | 1204 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
1205 | node = head; |
1206 | break; | |
5a65e956 | 1207 | |
2a37a3df SR |
1208 | case FORMAT_PRINTFMT: |
1209 | /* all done */ | |
1210 | return NULL; | |
5a65e956 LJ |
1211 | } |
1212 | ||
7710b639 ON |
1213 | node = node->prev; |
1214 | if (node == common_head) | |
86397dc3 | 1215 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 1216 | else if (node == head) |
2a37a3df | 1217 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
1218 | else |
1219 | return node; | |
2a37a3df SR |
1220 | } |
1221 | ||
1222 | static int f_show(struct seq_file *m, void *v) | |
1223 | { | |
2425bcb9 | 1224 | struct trace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
1225 | struct ftrace_event_field *field; |
1226 | const char *array_descriptor; | |
1227 | ||
1228 | switch ((unsigned long)v) { | |
1229 | case FORMAT_HEADER: | |
687fcc4a | 1230 | seq_printf(m, "name: %s\n", trace_event_name(call)); |
2a37a3df | 1231 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 1232 | seq_puts(m, "format:\n"); |
8728fe50 | 1233 | return 0; |
5a65e956 | 1234 | |
86397dc3 LZ |
1235 | case FORMAT_FIELD_SEPERATOR: |
1236 | seq_putc(m, '\n'); | |
1237 | return 0; | |
1238 | ||
2a37a3df SR |
1239 | case FORMAT_PRINTFMT: |
1240 | seq_printf(m, "\nprint fmt: %s\n", | |
1241 | call->print_fmt); | |
1242 | return 0; | |
981d081e | 1243 | } |
8728fe50 | 1244 | |
7710b639 | 1245 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
1246 | /* |
1247 | * Smartly shows the array type(except dynamic array). | |
1248 | * Normal: | |
1249 | * field:TYPE VAR | |
1250 | * If TYPE := TYPE[LEN], it is shown: | |
1251 | * field:TYPE VAR[LEN] | |
1252 | */ | |
1253 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 1254 | |
2a37a3df SR |
1255 | if (!strncmp(field->type, "__data_loc", 10)) |
1256 | array_descriptor = NULL; | |
8728fe50 | 1257 | |
2a37a3df SR |
1258 | if (!array_descriptor) |
1259 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1260 | field->type, field->name, field->offset, | |
1261 | field->size, !!field->is_signed); | |
1262 | else | |
1263 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1264 | (int)(array_descriptor - field->type), | |
1265 | field->type, field->name, | |
1266 | array_descriptor, field->offset, | |
1267 | field->size, !!field->is_signed); | |
8728fe50 | 1268 | |
2a37a3df SR |
1269 | return 0; |
1270 | } | |
5a65e956 | 1271 | |
7710b639 ON |
1272 | static void *f_start(struct seq_file *m, loff_t *pos) |
1273 | { | |
1274 | void *p = (void *)FORMAT_HEADER; | |
1275 | loff_t l = 0; | |
1276 | ||
c5a44a12 ON |
1277 | /* ->stop() is called even if ->start() fails */ |
1278 | mutex_lock(&event_mutex); | |
1279 | if (!event_file_data(m->private)) | |
1280 | return ERR_PTR(-ENODEV); | |
1281 | ||
7710b639 ON |
1282 | while (l < *pos && p) |
1283 | p = f_next(m, p, &l); | |
1284 | ||
1285 | return p; | |
1286 | } | |
1287 | ||
2a37a3df SR |
1288 | static void f_stop(struct seq_file *m, void *p) |
1289 | { | |
c5a44a12 | 1290 | mutex_unlock(&event_mutex); |
2a37a3df | 1291 | } |
981d081e | 1292 | |
2a37a3df SR |
1293 | static const struct seq_operations trace_format_seq_ops = { |
1294 | .start = f_start, | |
1295 | .next = f_next, | |
1296 | .stop = f_stop, | |
1297 | .show = f_show, | |
1298 | }; | |
1299 | ||
1300 | static int trace_format_open(struct inode *inode, struct file *file) | |
1301 | { | |
2a37a3df SR |
1302 | struct seq_file *m; |
1303 | int ret; | |
1304 | ||
1305 | ret = seq_open(file, &trace_format_seq_ops); | |
1306 | if (ret < 0) | |
1307 | return ret; | |
1308 | ||
1309 | m = file->private_data; | |
c5a44a12 | 1310 | m->private = file; |
2a37a3df SR |
1311 | |
1312 | return 0; | |
981d081e SR |
1313 | } |
1314 | ||
23725aee PZ |
1315 | static ssize_t |
1316 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1317 | { | |
1a11126b | 1318 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1319 | char buf[32]; |
1320 | int len; | |
23725aee PZ |
1321 | |
1322 | if (*ppos) | |
1323 | return 0; | |
1324 | ||
1a11126b ON |
1325 | if (unlikely(!id)) |
1326 | return -ENODEV; | |
1327 | ||
1328 | len = sprintf(buf, "%d\n", id); | |
1329 | ||
cd458ba9 | 1330 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1331 | } |
1332 | ||
7ce7e424 TZ |
1333 | static ssize_t |
1334 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1335 | loff_t *ppos) | |
1336 | { | |
7f1d2f82 | 1337 | struct trace_event_file *file; |
7ce7e424 | 1338 | struct trace_seq *s; |
e2912b09 | 1339 | int r = -ENODEV; |
7ce7e424 TZ |
1340 | |
1341 | if (*ppos) | |
1342 | return 0; | |
1343 | ||
1344 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1345 | |
7ce7e424 TZ |
1346 | if (!s) |
1347 | return -ENOMEM; | |
1348 | ||
1349 | trace_seq_init(s); | |
1350 | ||
e2912b09 | 1351 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1352 | file = event_file_data(filp); |
1353 | if (file) | |
1354 | print_event_filter(file, s); | |
e2912b09 ON |
1355 | mutex_unlock(&event_mutex); |
1356 | ||
f306cc82 | 1357 | if (file) |
5ac48378 SRRH |
1358 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1359 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1360 | |
1361 | kfree(s); | |
1362 | ||
1363 | return r; | |
1364 | } | |
1365 | ||
1366 | static ssize_t | |
1367 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1368 | loff_t *ppos) | |
1369 | { | |
7f1d2f82 | 1370 | struct trace_event_file *file; |
8b372562 | 1371 | char *buf; |
e2912b09 | 1372 | int err = -ENODEV; |
7ce7e424 | 1373 | |
8b372562 | 1374 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1375 | return -EINVAL; |
1376 | ||
70f6cbb6 AV |
1377 | buf = memdup_user_nul(ubuf, cnt); |
1378 | if (IS_ERR(buf)) | |
1379 | return PTR_ERR(buf); | |
7ce7e424 | 1380 | |
e2912b09 | 1381 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1382 | file = event_file_data(filp); |
1383 | if (file) | |
1384 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1385 | mutex_unlock(&event_mutex); |
1386 | ||
70f6cbb6 | 1387 | kfree(buf); |
8b372562 | 1388 | if (err < 0) |
44e9c8b7 | 1389 | return err; |
0a19e53c | 1390 | |
7ce7e424 TZ |
1391 | *ppos += cnt; |
1392 | ||
1393 | return cnt; | |
1394 | } | |
1395 | ||
e9dbfae5 SR |
1396 | static LIST_HEAD(event_subsystems); |
1397 | ||
1398 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1399 | { | |
1400 | struct event_subsystem *system = NULL; | |
7967b3e0 | 1401 | struct trace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
ae63b31e | 1402 | struct trace_array *tr; |
e9dbfae5 SR |
1403 | int ret; |
1404 | ||
d6d3523c GB |
1405 | if (tracing_is_disabled()) |
1406 | return -ENODEV; | |
1407 | ||
e9dbfae5 | 1408 | /* Make sure the system still exists */ |
a8227415 | 1409 | mutex_lock(&trace_types_lock); |
e9dbfae5 | 1410 | mutex_lock(&event_mutex); |
ae63b31e SR |
1411 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1412 | list_for_each_entry(dir, &tr->systems, list) { | |
1413 | if (dir == inode->i_private) { | |
1414 | /* Don't open systems with no events */ | |
1415 | if (dir->nr_events) { | |
1416 | __get_system_dir(dir); | |
1417 | system = dir->subsystem; | |
1418 | } | |
1419 | goto exit_loop; | |
e9dbfae5 | 1420 | } |
e9dbfae5 SR |
1421 | } |
1422 | } | |
ae63b31e | 1423 | exit_loop: |
e9dbfae5 | 1424 | mutex_unlock(&event_mutex); |
a8227415 | 1425 | mutex_unlock(&trace_types_lock); |
e9dbfae5 | 1426 | |
ae63b31e | 1427 | if (!system) |
e9dbfae5 SR |
1428 | return -ENODEV; |
1429 | ||
ae63b31e SR |
1430 | /* Some versions of gcc think dir can be uninitialized here */ |
1431 | WARN_ON(!dir); | |
1432 | ||
8e2e2fa4 SRRH |
1433 | /* Still need to increment the ref count of the system */ |
1434 | if (trace_array_get(tr) < 0) { | |
1435 | put_system(dir); | |
1436 | return -ENODEV; | |
1437 | } | |
1438 | ||
e9dbfae5 | 1439 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1440 | if (ret < 0) { |
1441 | trace_array_put(tr); | |
ae63b31e | 1442 | put_system(dir); |
8e2e2fa4 | 1443 | } |
ae63b31e SR |
1444 | |
1445 | return ret; | |
1446 | } | |
1447 | ||
1448 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1449 | { | |
7967b3e0 | 1450 | struct trace_subsystem_dir *dir; |
ae63b31e SR |
1451 | struct trace_array *tr = inode->i_private; |
1452 | int ret; | |
1453 | ||
d6d3523c GB |
1454 | if (tracing_is_disabled()) |
1455 | return -ENODEV; | |
1456 | ||
8e2e2fa4 SRRH |
1457 | if (trace_array_get(tr) < 0) |
1458 | return -ENODEV; | |
1459 | ||
ae63b31e SR |
1460 | /* Make a temporary dir that has no system but points to tr */ |
1461 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
8e2e2fa4 SRRH |
1462 | if (!dir) { |
1463 | trace_array_put(tr); | |
ae63b31e | 1464 | return -ENOMEM; |
8e2e2fa4 | 1465 | } |
ae63b31e SR |
1466 | |
1467 | dir->tr = tr; | |
1468 | ||
1469 | ret = tracing_open_generic(inode, filp); | |
8e2e2fa4 SRRH |
1470 | if (ret < 0) { |
1471 | trace_array_put(tr); | |
ae63b31e | 1472 | kfree(dir); |
d6d3523c | 1473 | return ret; |
8e2e2fa4 | 1474 | } |
ae63b31e SR |
1475 | |
1476 | filp->private_data = dir; | |
e9dbfae5 | 1477 | |
d6d3523c | 1478 | return 0; |
e9dbfae5 SR |
1479 | } |
1480 | ||
1481 | static int subsystem_release(struct inode *inode, struct file *file) | |
1482 | { | |
7967b3e0 | 1483 | struct trace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1484 | |
8e2e2fa4 SRRH |
1485 | trace_array_put(dir->tr); |
1486 | ||
ae63b31e SR |
1487 | /* |
1488 | * If dir->subsystem is NULL, then this is a temporary | |
1489 | * descriptor that was made for a trace_array to enable | |
1490 | * all subsystems. | |
1491 | */ | |
1492 | if (dir->subsystem) | |
1493 | put_system(dir); | |
1494 | else | |
1495 | kfree(dir); | |
e9dbfae5 SR |
1496 | |
1497 | return 0; | |
1498 | } | |
1499 | ||
cfb180f3 TZ |
1500 | static ssize_t |
1501 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1502 | loff_t *ppos) | |
1503 | { | |
7967b3e0 | 1504 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1505 | struct event_subsystem *system = dir->subsystem; |
cfb180f3 TZ |
1506 | struct trace_seq *s; |
1507 | int r; | |
1508 | ||
1509 | if (*ppos) | |
1510 | return 0; | |
1511 | ||
1512 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1513 | if (!s) | |
1514 | return -ENOMEM; | |
1515 | ||
1516 | trace_seq_init(s); | |
1517 | ||
8b372562 | 1518 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1519 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1520 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1521 | |
1522 | kfree(s); | |
1523 | ||
1524 | return r; | |
1525 | } | |
1526 | ||
1527 | static ssize_t | |
1528 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1529 | loff_t *ppos) | |
1530 | { | |
7967b3e0 | 1531 | struct trace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1532 | char *buf; |
cfb180f3 TZ |
1533 | int err; |
1534 | ||
8b372562 | 1535 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1536 | return -EINVAL; |
1537 | ||
70f6cbb6 AV |
1538 | buf = memdup_user_nul(ubuf, cnt); |
1539 | if (IS_ERR(buf)) | |
1540 | return PTR_ERR(buf); | |
cfb180f3 | 1541 | |
ae63b31e | 1542 | err = apply_subsystem_event_filter(dir, buf); |
70f6cbb6 | 1543 | kfree(buf); |
8b372562 | 1544 | if (err < 0) |
44e9c8b7 | 1545 | return err; |
cfb180f3 TZ |
1546 | |
1547 | *ppos += cnt; | |
1548 | ||
1549 | return cnt; | |
1550 | } | |
1551 | ||
d1b182a8 SR |
1552 | static ssize_t |
1553 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1554 | { | |
1555 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1556 | struct trace_seq *s; | |
1557 | int r; | |
1558 | ||
1559 | if (*ppos) | |
1560 | return 0; | |
1561 | ||
1562 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1563 | if (!s) | |
1564 | return -ENOMEM; | |
1565 | ||
1566 | trace_seq_init(s); | |
1567 | ||
1568 | func(s); | |
5ac48378 SRRH |
1569 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1570 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1571 | |
1572 | kfree(s); | |
1573 | ||
1574 | return r; | |
1575 | } | |
1576 | ||
8ca532ad SRRH |
1577 | static void ignore_task_cpu(void *data) |
1578 | { | |
1579 | struct trace_array *tr = data; | |
1580 | struct trace_pid_list *pid_list; | |
1581 | ||
1582 | /* | |
1583 | * This function is called by on_each_cpu() while the | |
1584 | * event_mutex is held. | |
1585 | */ | |
1586 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
1587 | mutex_is_locked(&event_mutex)); | |
1588 | ||
1589 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 1590 | trace_ignore_this_task(pid_list, current)); |
8ca532ad SRRH |
1591 | } |
1592 | ||
49090107 | 1593 | static ssize_t |
3fdaf80f | 1594 | ftrace_event_pid_write(struct file *filp, const char __user *ubuf, |
49090107 SRRH |
1595 | size_t cnt, loff_t *ppos) |
1596 | { | |
3fdaf80f | 1597 | struct seq_file *m = filp->private_data; |
49090107 SRRH |
1598 | struct trace_array *tr = m->private; |
1599 | struct trace_pid_list *filtered_pids = NULL; | |
f4d34a87 | 1600 | struct trace_pid_list *pid_list; |
3fdaf80f | 1601 | struct trace_event_file *file; |
76c813e2 | 1602 | ssize_t ret; |
49090107 SRRH |
1603 | |
1604 | if (!cnt) | |
1605 | return 0; | |
1606 | ||
1607 | ret = tracing_update_buffers(); | |
1608 | if (ret < 0) | |
1609 | return ret; | |
1610 | ||
49090107 | 1611 | mutex_lock(&event_mutex); |
76c813e2 | 1612 | |
f4d34a87 SR |
1613 | filtered_pids = rcu_dereference_protected(tr->filtered_pids, |
1614 | lockdep_is_held(&event_mutex)); | |
1615 | ||
76c813e2 SRRH |
1616 | ret = trace_pid_write(filtered_pids, &pid_list, ubuf, cnt); |
1617 | if (ret < 0) | |
f4d34a87 | 1618 | goto out; |
49090107 | 1619 | |
49090107 SRRH |
1620 | rcu_assign_pointer(tr->filtered_pids, pid_list); |
1621 | ||
3fdaf80f SRRH |
1622 | list_for_each_entry(file, &tr->events, list) { |
1623 | set_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
1624 | } | |
49090107 SRRH |
1625 | |
1626 | if (filtered_pids) { | |
1627 | synchronize_sched(); | |
76c813e2 SRRH |
1628 | trace_free_pid_list(filtered_pids); |
1629 | } else if (pid_list) { | |
3fdaf80f SRRH |
1630 | /* |
1631 | * Register a probe that is called before all other probes | |
1632 | * to set ignore_pid if next or prev do not match. | |
1633 | * Register a probe this is called after all other probes | |
1634 | * to only keep ignore_pid set if next pid matches. | |
1635 | */ | |
1636 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_pre, | |
1637 | tr, INT_MAX); | |
1638 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_post, | |
1639 | tr, 0); | |
1640 | ||
1641 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, | |
1642 | tr, INT_MAX); | |
1643 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, | |
1644 | tr, 0); | |
0f72e37e SRRH |
1645 | |
1646 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, | |
1647 | tr, INT_MAX); | |
1648 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, | |
1649 | tr, 0); | |
1650 | ||
1651 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_pre, | |
1652 | tr, INT_MAX); | |
1653 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_post, | |
1654 | tr, 0); | |
49090107 SRRH |
1655 | } |
1656 | ||
799fd44c SRRH |
1657 | /* |
1658 | * Ignoring of pids is done at task switch. But we have to | |
1659 | * check for those tasks that are currently running. | |
1660 | * Always do this in case a pid was appended or removed. | |
1661 | */ | |
1662 | on_each_cpu(ignore_task_cpu, tr, 1); | |
1663 | ||
f4d34a87 | 1664 | out: |
3fdaf80f SRRH |
1665 | mutex_unlock(&event_mutex); |
1666 | ||
76c813e2 SRRH |
1667 | if (ret > 0) |
1668 | *ppos += ret; | |
49090107 SRRH |
1669 | |
1670 | return ret; | |
1671 | } | |
1672 | ||
15075cac SR |
1673 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1674 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
49090107 | 1675 | static int ftrace_event_set_pid_open(struct inode *inode, struct file *file); |
f77d09a3 | 1676 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1677 | |
b77e38aa SR |
1678 | static const struct seq_operations show_event_seq_ops = { |
1679 | .start = t_start, | |
1680 | .next = t_next, | |
1681 | .show = t_show, | |
1682 | .stop = t_stop, | |
1683 | }; | |
1684 | ||
1685 | static const struct seq_operations show_set_event_seq_ops = { | |
1686 | .start = s_start, | |
1687 | .next = s_next, | |
1688 | .show = t_show, | |
1689 | .stop = t_stop, | |
1690 | }; | |
1691 | ||
49090107 SRRH |
1692 | static const struct seq_operations show_set_pid_seq_ops = { |
1693 | .start = p_start, | |
1694 | .next = p_next, | |
5cc8976b | 1695 | .show = trace_pid_show, |
49090107 SRRH |
1696 | .stop = p_stop, |
1697 | }; | |
1698 | ||
2314c4ae | 1699 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1700 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1701 | .read = seq_read, |
1702 | .llseek = seq_lseek, | |
1703 | .release = seq_release, | |
1704 | }; | |
1705 | ||
b77e38aa | 1706 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1707 | .open = ftrace_event_set_open, |
b77e38aa SR |
1708 | .read = seq_read, |
1709 | .write = ftrace_event_write, | |
1710 | .llseek = seq_lseek, | |
f77d09a3 | 1711 | .release = ftrace_event_release, |
b77e38aa SR |
1712 | }; |
1713 | ||
49090107 SRRH |
1714 | static const struct file_operations ftrace_set_event_pid_fops = { |
1715 | .open = ftrace_event_set_pid_open, | |
1716 | .read = seq_read, | |
1717 | .write = ftrace_event_pid_write, | |
1718 | .llseek = seq_lseek, | |
1719 | .release = ftrace_event_release, | |
1720 | }; | |
1721 | ||
1473e441 | 1722 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 1723 | .open = tracing_open_generic, |
1473e441 SR |
1724 | .read = event_enable_read, |
1725 | .write = event_enable_write, | |
6038f373 | 1726 | .llseek = default_llseek, |
1473e441 SR |
1727 | }; |
1728 | ||
981d081e | 1729 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1730 | .open = trace_format_open, |
1731 | .read = seq_read, | |
1732 | .llseek = seq_lseek, | |
1733 | .release = seq_release, | |
981d081e SR |
1734 | }; |
1735 | ||
23725aee | 1736 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1737 | .read = event_id_read, |
6038f373 | 1738 | .llseek = default_llseek, |
23725aee PZ |
1739 | }; |
1740 | ||
7ce7e424 TZ |
1741 | static const struct file_operations ftrace_event_filter_fops = { |
1742 | .open = tracing_open_generic, | |
1743 | .read = event_filter_read, | |
1744 | .write = event_filter_write, | |
6038f373 | 1745 | .llseek = default_llseek, |
7ce7e424 TZ |
1746 | }; |
1747 | ||
cfb180f3 | 1748 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1749 | .open = subsystem_open, |
cfb180f3 TZ |
1750 | .read = subsystem_filter_read, |
1751 | .write = subsystem_filter_write, | |
6038f373 | 1752 | .llseek = default_llseek, |
e9dbfae5 | 1753 | .release = subsystem_release, |
cfb180f3 TZ |
1754 | }; |
1755 | ||
8ae79a13 | 1756 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1757 | .open = subsystem_open, |
8ae79a13 SR |
1758 | .read = system_enable_read, |
1759 | .write = system_enable_write, | |
6038f373 | 1760 | .llseek = default_llseek, |
40ee4dff | 1761 | .release = subsystem_release, |
8ae79a13 SR |
1762 | }; |
1763 | ||
ae63b31e SR |
1764 | static const struct file_operations ftrace_tr_enable_fops = { |
1765 | .open = system_tr_open, | |
1766 | .read = system_enable_read, | |
1767 | .write = system_enable_write, | |
1768 | .llseek = default_llseek, | |
1769 | .release = subsystem_release, | |
1770 | }; | |
1771 | ||
d1b182a8 SR |
1772 | static const struct file_operations ftrace_show_header_fops = { |
1773 | .open = tracing_open_generic, | |
1774 | .read = show_header, | |
6038f373 | 1775 | .llseek = default_llseek, |
d1b182a8 SR |
1776 | }; |
1777 | ||
ae63b31e SR |
1778 | static int |
1779 | ftrace_event_open(struct inode *inode, struct file *file, | |
1780 | const struct seq_operations *seq_ops) | |
1473e441 | 1781 | { |
ae63b31e SR |
1782 | struct seq_file *m; |
1783 | int ret; | |
1473e441 | 1784 | |
ae63b31e SR |
1785 | ret = seq_open(file, seq_ops); |
1786 | if (ret < 0) | |
1787 | return ret; | |
1788 | m = file->private_data; | |
1789 | /* copy tr over to seq ops */ | |
1790 | m->private = inode->i_private; | |
1473e441 | 1791 | |
ae63b31e | 1792 | return ret; |
1473e441 SR |
1793 | } |
1794 | ||
f77d09a3 AL |
1795 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1796 | { | |
1797 | struct trace_array *tr = inode->i_private; | |
1798 | ||
1799 | trace_array_put(tr); | |
1800 | ||
1801 | return seq_release(inode, file); | |
1802 | } | |
1803 | ||
15075cac SR |
1804 | static int |
1805 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1806 | { | |
1807 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1808 | ||
ae63b31e | 1809 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1810 | } |
1811 | ||
1812 | static int | |
1813 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1814 | { | |
1815 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1816 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
1817 | int ret; |
1818 | ||
1819 | if (trace_array_get(tr) < 0) | |
1820 | return -ENODEV; | |
15075cac SR |
1821 | |
1822 | if ((file->f_mode & FMODE_WRITE) && | |
1823 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1824 | ftrace_clear_events(tr); |
15075cac | 1825 | |
f77d09a3 AL |
1826 | ret = ftrace_event_open(inode, file, seq_ops); |
1827 | if (ret < 0) | |
1828 | trace_array_put(tr); | |
1829 | return ret; | |
ae63b31e SR |
1830 | } |
1831 | ||
49090107 SRRH |
1832 | static int |
1833 | ftrace_event_set_pid_open(struct inode *inode, struct file *file) | |
1834 | { | |
1835 | const struct seq_operations *seq_ops = &show_set_pid_seq_ops; | |
1836 | struct trace_array *tr = inode->i_private; | |
1837 | int ret; | |
1838 | ||
1839 | if (trace_array_get(tr) < 0) | |
1840 | return -ENODEV; | |
1841 | ||
1842 | if ((file->f_mode & FMODE_WRITE) && | |
1843 | (file->f_flags & O_TRUNC)) | |
1844 | ftrace_clear_event_pids(tr); | |
1845 | ||
1846 | ret = ftrace_event_open(inode, file, seq_ops); | |
1847 | if (ret < 0) | |
1848 | trace_array_put(tr); | |
1849 | return ret; | |
1850 | } | |
1851 | ||
ae63b31e SR |
1852 | static struct event_subsystem * |
1853 | create_new_subsystem(const char *name) | |
1854 | { | |
1855 | struct event_subsystem *system; | |
1856 | ||
1857 | /* need to create new entry */ | |
1858 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1859 | if (!system) | |
1860 | return NULL; | |
1861 | ||
1862 | system->ref_count = 1; | |
6e94a780 SR |
1863 | |
1864 | /* Only allocate if dynamic (kprobes and modules) */ | |
79ac6ef5 RV |
1865 | system->name = kstrdup_const(name, GFP_KERNEL); |
1866 | if (!system->name) | |
1867 | goto out_free; | |
ae63b31e SR |
1868 | |
1869 | system->filter = NULL; | |
1870 | ||
1871 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1872 | if (!system->filter) | |
1873 | goto out_free; | |
1874 | ||
1875 | list_add(&system->list, &event_subsystems); | |
1876 | ||
1877 | return system; | |
1878 | ||
1879 | out_free: | |
79ac6ef5 | 1880 | kfree_const(system->name); |
ae63b31e SR |
1881 | kfree(system); |
1882 | return NULL; | |
15075cac SR |
1883 | } |
1884 | ||
6ecc2d1c | 1885 | static struct dentry * |
ae63b31e | 1886 | event_subsystem_dir(struct trace_array *tr, const char *name, |
7f1d2f82 | 1887 | struct trace_event_file *file, struct dentry *parent) |
6ecc2d1c | 1888 | { |
7967b3e0 | 1889 | struct trace_subsystem_dir *dir; |
6ecc2d1c | 1890 | struct event_subsystem *system; |
e1112b4d | 1891 | struct dentry *entry; |
6ecc2d1c SR |
1892 | |
1893 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1894 | list_for_each_entry(dir, &tr->systems, list) { |
1895 | system = dir->subsystem; | |
dc82ec98 | 1896 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1897 | dir->nr_events++; |
1898 | file->system = dir; | |
1899 | return dir->entry; | |
dc82ec98 | 1900 | } |
6ecc2d1c SR |
1901 | } |
1902 | ||
ae63b31e SR |
1903 | /* Now see if the system itself exists. */ |
1904 | list_for_each_entry(system, &event_subsystems, list) { | |
1905 | if (strcmp(system->name, name) == 0) | |
1906 | break; | |
6ecc2d1c | 1907 | } |
ae63b31e SR |
1908 | /* Reset system variable when not found */ |
1909 | if (&system->list == &event_subsystems) | |
1910 | system = NULL; | |
6ecc2d1c | 1911 | |
ae63b31e SR |
1912 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1913 | if (!dir) | |
1914 | goto out_fail; | |
6ecc2d1c | 1915 | |
ae63b31e SR |
1916 | if (!system) { |
1917 | system = create_new_subsystem(name); | |
1918 | if (!system) | |
1919 | goto out_free; | |
1920 | } else | |
1921 | __get_system(system); | |
1922 | ||
8434dc93 | 1923 | dir->entry = tracefs_create_dir(name, parent); |
ae63b31e | 1924 | if (!dir->entry) { |
3448bac3 | 1925 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
1926 | __put_system(system); |
1927 | goto out_free; | |
6d723736 SR |
1928 | } |
1929 | ||
ae63b31e SR |
1930 | dir->tr = tr; |
1931 | dir->ref_count = 1; | |
1932 | dir->nr_events = 1; | |
1933 | dir->subsystem = system; | |
1934 | file->system = dir; | |
8b372562 | 1935 | |
8434dc93 | 1936 | entry = tracefs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1937 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1938 | if (!entry) { |
1939 | kfree(system->filter); | |
1940 | system->filter = NULL; | |
8434dc93 | 1941 | pr_warn("Could not create tracefs '%s/filter' entry\n", name); |
8b372562 | 1942 | } |
e1112b4d | 1943 | |
ae63b31e | 1944 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1945 | &ftrace_system_enable_fops); |
8ae79a13 | 1946 | |
ae63b31e SR |
1947 | list_add(&dir->list, &tr->systems); |
1948 | ||
1949 | return dir->entry; | |
1950 | ||
1951 | out_free: | |
1952 | kfree(dir); | |
1953 | out_fail: | |
1954 | /* Only print this message if failed on memory allocation */ | |
1955 | if (!dir || !system) | |
3448bac3 | 1956 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 1957 | return NULL; |
6ecc2d1c SR |
1958 | } |
1959 | ||
1473e441 | 1960 | static int |
7f1d2f82 | 1961 | event_create_dir(struct dentry *parent, struct trace_event_file *file) |
1473e441 | 1962 | { |
2425bcb9 | 1963 | struct trace_event_call *call = file->event_call; |
ae63b31e | 1964 | struct trace_array *tr = file->tr; |
2e33af02 | 1965 | struct list_head *head; |
ae63b31e | 1966 | struct dentry *d_events; |
de7b2973 | 1967 | const char *name; |
fd994989 | 1968 | int ret; |
1473e441 | 1969 | |
6ecc2d1c SR |
1970 | /* |
1971 | * If the trace point header did not define TRACE_SYSTEM | |
1972 | * then the system would be called "TRACE_SYSTEM". | |
1973 | */ | |
ae63b31e SR |
1974 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1975 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1976 | if (!d_events) | |
1977 | return -ENOMEM; | |
1978 | } else | |
1979 | d_events = parent; | |
1980 | ||
687fcc4a | 1981 | name = trace_event_name(call); |
8434dc93 | 1982 | file->dir = tracefs_create_dir(name, d_events); |
ae63b31e | 1983 | if (!file->dir) { |
8434dc93 | 1984 | pr_warn("Could not create tracefs '%s' directory\n", name); |
1473e441 SR |
1985 | return -1; |
1986 | } | |
1987 | ||
9b63776f | 1988 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1989 | trace_create_file("enable", 0644, file->dir, file, |
620a30e9 | 1990 | &ftrace_enable_fops); |
1473e441 | 1991 | |
2239291a | 1992 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1993 | if (call->event.type && call->class->reg) |
1a11126b | 1994 | trace_create_file("id", 0444, file->dir, |
620a30e9 ON |
1995 | (void *)(long)call->event.type, |
1996 | &ftrace_event_id_fops); | |
2239291a | 1997 | #endif |
23725aee | 1998 | |
c9d932cf LZ |
1999 | /* |
2000 | * Other events may have the same class. Only update | |
2001 | * the fields if they are not already defined. | |
2002 | */ | |
2003 | head = trace_get_fields(call); | |
2004 | if (list_empty(head)) { | |
2005 | ret = call->class->define_fields(call); | |
2006 | if (ret < 0) { | |
3448bac3 FF |
2007 | pr_warn("Could not initialize trace point events/%s\n", |
2008 | name); | |
ae63b31e | 2009 | return -1; |
cf027f64 TZ |
2010 | } |
2011 | } | |
f306cc82 | 2012 | trace_create_file("filter", 0644, file->dir, file, |
620a30e9 | 2013 | &ftrace_event_filter_fops); |
cf027f64 | 2014 | |
854145e0 CH |
2015 | /* |
2016 | * Only event directories that can be enabled should have | |
2017 | * triggers. | |
2018 | */ | |
2019 | if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
2020 | trace_create_file("trigger", 0644, file->dir, file, | |
2021 | &event_trigger_fops); | |
85f2b082 | 2022 | |
7ef224d1 TZ |
2023 | #ifdef CONFIG_HIST_TRIGGERS |
2024 | trace_create_file("hist", 0444, file->dir, file, | |
2025 | &event_hist_fops); | |
2026 | #endif | |
ae63b31e | 2027 | trace_create_file("format", 0444, file->dir, call, |
620a30e9 | 2028 | &ftrace_event_format_fops); |
6d723736 SR |
2029 | |
2030 | return 0; | |
2031 | } | |
2032 | ||
2425bcb9 | 2033 | static void remove_event_from_tracers(struct trace_event_call *call) |
ae63b31e | 2034 | { |
7f1d2f82 | 2035 | struct trace_event_file *file; |
ae63b31e SR |
2036 | struct trace_array *tr; |
2037 | ||
2038 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
2039 | if (file->event_call != call) |
2040 | continue; | |
2041 | ||
f6a84bdc | 2042 | remove_event_file_dir(file); |
ae63b31e SR |
2043 | /* |
2044 | * The do_for_each_event_file_safe() is | |
2045 | * a double loop. After finding the call for this | |
2046 | * trace_array, we use break to jump to the next | |
2047 | * trace_array. | |
2048 | */ | |
2049 | break; | |
2050 | } while_for_each_event_file(); | |
2051 | } | |
2052 | ||
2425bcb9 | 2053 | static void event_remove(struct trace_event_call *call) |
8781915a | 2054 | { |
ae63b31e | 2055 | struct trace_array *tr; |
7f1d2f82 | 2056 | struct trace_event_file *file; |
ae63b31e SR |
2057 | |
2058 | do_for_each_event_file(tr, file) { | |
2059 | if (file->event_call != call) | |
2060 | continue; | |
065e63f9 SRV |
2061 | |
2062 | if (file->flags & EVENT_FILE_FL_WAS_ENABLED) | |
2063 | tr->clear_trace = true; | |
2064 | ||
ae63b31e SR |
2065 | ftrace_event_enable_disable(file, 0); |
2066 | /* | |
2067 | * The do_for_each_event_file() is | |
2068 | * a double loop. After finding the call for this | |
2069 | * trace_array, we use break to jump to the next | |
2070 | * trace_array. | |
2071 | */ | |
2072 | break; | |
2073 | } while_for_each_event_file(); | |
2074 | ||
8781915a | 2075 | if (call->event.funcs) |
9023c930 | 2076 | __unregister_trace_event(&call->event); |
ae63b31e | 2077 | remove_event_from_tracers(call); |
8781915a EG |
2078 | list_del(&call->list); |
2079 | } | |
2080 | ||
2425bcb9 | 2081 | static int event_init(struct trace_event_call *call) |
8781915a EG |
2082 | { |
2083 | int ret = 0; | |
de7b2973 | 2084 | const char *name; |
8781915a | 2085 | |
687fcc4a | 2086 | name = trace_event_name(call); |
de7b2973 | 2087 | if (WARN_ON(!name)) |
8781915a EG |
2088 | return -EINVAL; |
2089 | ||
2090 | if (call->class->raw_init) { | |
2091 | ret = call->class->raw_init(call); | |
2092 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 2093 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
2094 | } |
2095 | ||
2096 | return ret; | |
2097 | } | |
2098 | ||
67ead0a6 | 2099 | static int |
2425bcb9 | 2100 | __register_event(struct trace_event_call *call, struct module *mod) |
bd1a5c84 | 2101 | { |
bd1a5c84 | 2102 | int ret; |
6d723736 | 2103 | |
8781915a EG |
2104 | ret = event_init(call); |
2105 | if (ret < 0) | |
2106 | return ret; | |
701970b3 | 2107 | |
ae63b31e | 2108 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 2109 | call->mod = mod; |
88f70d75 | 2110 | |
ae63b31e | 2111 | return 0; |
bd1a5c84 MH |
2112 | } |
2113 | ||
67ec0d85 | 2114 | static char *eval_replace(char *ptr, struct trace_eval_map *map, int len) |
0c564a53 SRRH |
2115 | { |
2116 | int rlen; | |
2117 | int elen; | |
2118 | ||
67ec0d85 | 2119 | /* Find the length of the eval value as a string */ |
00f4b652 | 2120 | elen = snprintf(ptr, 0, "%ld", map->eval_value); |
0c564a53 SRRH |
2121 | /* Make sure there's enough room to replace the string with the value */ |
2122 | if (len < elen) | |
2123 | return NULL; | |
2124 | ||
00f4b652 | 2125 | snprintf(ptr, elen + 1, "%ld", map->eval_value); |
0c564a53 SRRH |
2126 | |
2127 | /* Get the rest of the string of ptr */ | |
2128 | rlen = strlen(ptr + len); | |
2129 | memmove(ptr + elen, ptr + len, rlen); | |
2130 | /* Make sure we end the new string */ | |
2131 | ptr[elen + rlen] = 0; | |
2132 | ||
2133 | return ptr + elen; | |
2134 | } | |
2135 | ||
2425bcb9 | 2136 | static void update_event_printk(struct trace_event_call *call, |
00f4b652 | 2137 | struct trace_eval_map *map) |
0c564a53 SRRH |
2138 | { |
2139 | char *ptr; | |
2140 | int quote = 0; | |
00f4b652 | 2141 | int len = strlen(map->eval_string); |
0c564a53 SRRH |
2142 | |
2143 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
2144 | if (*ptr == '\\') { | |
2145 | ptr++; | |
2146 | /* paranoid */ | |
2147 | if (!*ptr) | |
2148 | break; | |
2149 | continue; | |
2150 | } | |
2151 | if (*ptr == '"') { | |
2152 | quote ^= 1; | |
2153 | continue; | |
2154 | } | |
2155 | if (quote) | |
2156 | continue; | |
2157 | if (isdigit(*ptr)) { | |
2158 | /* skip numbers */ | |
2159 | do { | |
2160 | ptr++; | |
2161 | /* Check for alpha chars like ULL */ | |
2162 | } while (isalnum(*ptr)); | |
3193899d SRRH |
2163 | if (!*ptr) |
2164 | break; | |
0c564a53 SRRH |
2165 | /* |
2166 | * A number must have some kind of delimiter after | |
2167 | * it, and we can ignore that too. | |
2168 | */ | |
2169 | continue; | |
2170 | } | |
2171 | if (isalpha(*ptr) || *ptr == '_') { | |
00f4b652 | 2172 | if (strncmp(map->eval_string, ptr, len) == 0 && |
0c564a53 | 2173 | !isalnum(ptr[len]) && ptr[len] != '_') { |
67ec0d85 JL |
2174 | ptr = eval_replace(ptr, map, len); |
2175 | /* enum/sizeof string smaller than value */ | |
0c564a53 SRRH |
2176 | if (WARN_ON_ONCE(!ptr)) |
2177 | return; | |
2178 | /* | |
67ec0d85 | 2179 | * No need to decrement here, as eval_replace() |
0c564a53 | 2180 | * returns the pointer to the character passed |
67ec0d85 | 2181 | * the eval, and two evals can not be placed |
0c564a53 SRRH |
2182 | * back to back without something in between. |
2183 | * We can skip that something in between. | |
2184 | */ | |
2185 | continue; | |
2186 | } | |
2187 | skip_more: | |
2188 | do { | |
2189 | ptr++; | |
2190 | } while (isalnum(*ptr) || *ptr == '_'); | |
3193899d SRRH |
2191 | if (!*ptr) |
2192 | break; | |
0c564a53 SRRH |
2193 | /* |
2194 | * If what comes after this variable is a '.' or | |
2195 | * '->' then we can continue to ignore that string. | |
2196 | */ | |
2197 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
2198 | ptr += *ptr == '.' ? 1 : 2; | |
3193899d SRRH |
2199 | if (!*ptr) |
2200 | break; | |
0c564a53 SRRH |
2201 | goto skip_more; |
2202 | } | |
2203 | /* | |
2204 | * Once again, we can skip the delimiter that came | |
2205 | * after the string. | |
2206 | */ | |
2207 | continue; | |
2208 | } | |
2209 | } | |
2210 | } | |
2211 | ||
f57a4143 | 2212 | void trace_event_eval_update(struct trace_eval_map **map, int len) |
0c564a53 | 2213 | { |
2425bcb9 | 2214 | struct trace_event_call *call, *p; |
0c564a53 SRRH |
2215 | const char *last_system = NULL; |
2216 | int last_i; | |
2217 | int i; | |
2218 | ||
2219 | down_write(&trace_event_sem); | |
2220 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
2221 | /* events are usually grouped together with systems */ | |
2222 | if (!last_system || call->class->system != last_system) { | |
2223 | last_i = 0; | |
2224 | last_system = call->class->system; | |
2225 | } | |
2226 | ||
2227 | for (i = last_i; i < len; i++) { | |
2228 | if (call->class->system == map[i]->system) { | |
2229 | /* Save the first system if need be */ | |
2230 | if (!last_i) | |
2231 | last_i = i; | |
2232 | update_event_printk(call, map[i]); | |
2233 | } | |
2234 | } | |
2235 | } | |
2236 | up_write(&trace_event_sem); | |
2237 | } | |
2238 | ||
7f1d2f82 | 2239 | static struct trace_event_file * |
2425bcb9 | 2240 | trace_create_new_event(struct trace_event_call *call, |
da511bf3 SRRH |
2241 | struct trace_array *tr) |
2242 | { | |
7f1d2f82 | 2243 | struct trace_event_file *file; |
da511bf3 SRRH |
2244 | |
2245 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
2246 | if (!file) | |
2247 | return NULL; | |
2248 | ||
2249 | file->event_call = call; | |
2250 | file->tr = tr; | |
2251 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
2252 | atomic_set(&file->tm_ref, 0); |
2253 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
2254 | list_add(&file->list, &tr->events); |
2255 | ||
2256 | return file; | |
2257 | } | |
2258 | ||
ae63b31e SR |
2259 | /* Add an event to a trace directory */ |
2260 | static int | |
2425bcb9 | 2261 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) |
ae63b31e | 2262 | { |
7f1d2f82 | 2263 | struct trace_event_file *file; |
ae63b31e | 2264 | |
da511bf3 | 2265 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
2266 | if (!file) |
2267 | return -ENOMEM; | |
2268 | ||
620a30e9 | 2269 | return event_create_dir(tr->event_dir, file); |
ae63b31e SR |
2270 | } |
2271 | ||
77248221 SR |
2272 | /* |
2273 | * Just create a decriptor for early init. A descriptor is required | |
2274 | * for enabling events at boot. We want to enable events before | |
2275 | * the filesystem is initialized. | |
2276 | */ | |
2277 | static __init int | |
2425bcb9 | 2278 | __trace_early_add_new_event(struct trace_event_call *call, |
77248221 SR |
2279 | struct trace_array *tr) |
2280 | { | |
7f1d2f82 | 2281 | struct trace_event_file *file; |
77248221 | 2282 | |
da511bf3 | 2283 | file = trace_create_new_event(call, tr); |
77248221 SR |
2284 | if (!file) |
2285 | return -ENOMEM; | |
2286 | ||
77248221 SR |
2287 | return 0; |
2288 | } | |
2289 | ||
ae63b31e | 2290 | struct ftrace_module_file_ops; |
2425bcb9 | 2291 | static void __add_event_to_tracers(struct trace_event_call *call); |
ae63b31e | 2292 | |
bd1a5c84 | 2293 | /* Add an additional event_call dynamically */ |
2425bcb9 | 2294 | int trace_add_event_call(struct trace_event_call *call) |
bd1a5c84 MH |
2295 | { |
2296 | int ret; | |
a8227415 | 2297 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 2298 | mutex_lock(&event_mutex); |
701970b3 | 2299 | |
ae63b31e SR |
2300 | ret = __register_event(call, NULL); |
2301 | if (ret >= 0) | |
779c5e37 | 2302 | __add_event_to_tracers(call); |
a2ca5e03 | 2303 | |
ae63b31e | 2304 | mutex_unlock(&event_mutex); |
a8227415 | 2305 | mutex_unlock(&trace_types_lock); |
ae63b31e | 2306 | return ret; |
a2ca5e03 FW |
2307 | } |
2308 | ||
4fead8e4 | 2309 | /* |
a8227415 AL |
2310 | * Must be called under locking of trace_types_lock, event_mutex and |
2311 | * trace_event_sem. | |
4fead8e4 | 2312 | */ |
2425bcb9 | 2313 | static void __trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2314 | { |
8781915a | 2315 | event_remove(call); |
bd1a5c84 | 2316 | trace_destroy_fields(call); |
57375747 ON |
2317 | free_event_filter(call->filter); |
2318 | call->filter = NULL; | |
bd1a5c84 MH |
2319 | } |
2320 | ||
2425bcb9 | 2321 | static int probe_remove_event_call(struct trace_event_call *call) |
2816c551 ON |
2322 | { |
2323 | struct trace_array *tr; | |
7f1d2f82 | 2324 | struct trace_event_file *file; |
2816c551 ON |
2325 | |
2326 | #ifdef CONFIG_PERF_EVENTS | |
2327 | if (call->perf_refcount) | |
2328 | return -EBUSY; | |
2329 | #endif | |
2330 | do_for_each_event_file(tr, file) { | |
2331 | if (file->event_call != call) | |
2332 | continue; | |
2333 | /* | |
2334 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
5d6ad960 | 2335 | * we are going to do, EVENT_FILE_FL_SOFT_MODE can suppress |
2816c551 ON |
2336 | * TRACE_REG_UNREGISTER. |
2337 | */ | |
5d6ad960 | 2338 | if (file->flags & EVENT_FILE_FL_ENABLED) |
2816c551 | 2339 | return -EBUSY; |
2ba64035 SRRH |
2340 | /* |
2341 | * The do_for_each_event_file_safe() is | |
2342 | * a double loop. After finding the call for this | |
2343 | * trace_array, we use break to jump to the next | |
2344 | * trace_array. | |
2345 | */ | |
2816c551 ON |
2346 | break; |
2347 | } while_for_each_event_file(); | |
2348 | ||
2349 | __trace_remove_event_call(call); | |
2350 | ||
2351 | return 0; | |
2352 | } | |
2353 | ||
bd1a5c84 | 2354 | /* Remove an event_call */ |
2425bcb9 | 2355 | int trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2356 | { |
2816c551 ON |
2357 | int ret; |
2358 | ||
a8227415 | 2359 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 2360 | mutex_lock(&event_mutex); |
52f6ad6d | 2361 | down_write(&trace_event_sem); |
2816c551 | 2362 | ret = probe_remove_event_call(call); |
52f6ad6d | 2363 | up_write(&trace_event_sem); |
bd1a5c84 | 2364 | mutex_unlock(&event_mutex); |
a8227415 | 2365 | mutex_unlock(&trace_types_lock); |
2816c551 ON |
2366 | |
2367 | return ret; | |
bd1a5c84 MH |
2368 | } |
2369 | ||
2370 | #define for_each_event(event, start, end) \ | |
2371 | for (event = start; \ | |
2372 | (unsigned long)event < (unsigned long)end; \ | |
2373 | event++) | |
2374 | ||
2375 | #ifdef CONFIG_MODULES | |
2376 | ||
6d723736 SR |
2377 | static void trace_module_add_events(struct module *mod) |
2378 | { | |
2425bcb9 | 2379 | struct trace_event_call **call, **start, **end; |
6d723736 | 2380 | |
45ab2813 SRRH |
2381 | if (!mod->num_trace_events) |
2382 | return; | |
2383 | ||
2384 | /* Don't add infrastructure for mods without tracepoints */ | |
2385 | if (trace_module_has_bad_taint(mod)) { | |
2386 | pr_err("%s: module has bad taint, not creating trace events\n", | |
2387 | mod->name); | |
2388 | return; | |
2389 | } | |
2390 | ||
6d723736 SR |
2391 | start = mod->trace_events; |
2392 | end = mod->trace_events + mod->num_trace_events; | |
2393 | ||
6d723736 | 2394 | for_each_event(call, start, end) { |
ae63b31e | 2395 | __register_event(*call, mod); |
779c5e37 | 2396 | __add_event_to_tracers(*call); |
6d723736 SR |
2397 | } |
2398 | } | |
2399 | ||
2400 | static void trace_module_remove_events(struct module *mod) | |
2401 | { | |
2425bcb9 | 2402 | struct trace_event_call *call, *p; |
6d723736 | 2403 | |
52f6ad6d | 2404 | down_write(&trace_event_sem); |
6d723736 | 2405 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
065e63f9 | 2406 | if (call->mod == mod) |
bd1a5c84 | 2407 | __trace_remove_event_call(call); |
6d723736 | 2408 | } |
52f6ad6d | 2409 | up_write(&trace_event_sem); |
9456f0fa SR |
2410 | |
2411 | /* | |
2412 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
2413 | * registered any events that were used. The only worry is if |
2414 | * a new module gets loaded, and takes on the same id as the events | |
2415 | * of this module. When printing out the buffer, traced events left | |
2416 | * over from this module may be passed to the new module events and | |
2417 | * unexpected results may occur. | |
9456f0fa | 2418 | */ |
065e63f9 | 2419 | tracing_reset_all_online_cpus(); |
6d723736 SR |
2420 | } |
2421 | ||
61f919a1 SR |
2422 | static int trace_module_notify(struct notifier_block *self, |
2423 | unsigned long val, void *data) | |
6d723736 SR |
2424 | { |
2425 | struct module *mod = data; | |
2426 | ||
a8227415 | 2427 | mutex_lock(&trace_types_lock); |
6d723736 SR |
2428 | mutex_lock(&event_mutex); |
2429 | switch (val) { | |
2430 | case MODULE_STATE_COMING: | |
2431 | trace_module_add_events(mod); | |
2432 | break; | |
2433 | case MODULE_STATE_GOING: | |
2434 | trace_module_remove_events(mod); | |
2435 | break; | |
2436 | } | |
2437 | mutex_unlock(&event_mutex); | |
a8227415 | 2438 | mutex_unlock(&trace_types_lock); |
fd994989 | 2439 | |
1473e441 SR |
2440 | return 0; |
2441 | } | |
315326c1 | 2442 | |
836d481e ON |
2443 | static struct notifier_block trace_module_nb = { |
2444 | .notifier_call = trace_module_notify, | |
3673b8e4 | 2445 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 2446 | }; |
61f919a1 | 2447 | #endif /* CONFIG_MODULES */ |
1473e441 | 2448 | |
ae63b31e SR |
2449 | /* Create a new event directory structure for a trace directory. */ |
2450 | static void | |
2451 | __trace_add_event_dirs(struct trace_array *tr) | |
2452 | { | |
2425bcb9 | 2453 | struct trace_event_call *call; |
ae63b31e SR |
2454 | int ret; |
2455 | ||
2456 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 2457 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 2458 | if (ret < 0) |
3448bac3 | 2459 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2460 | trace_event_name(call)); |
ae63b31e SR |
2461 | } |
2462 | } | |
2463 | ||
7f1d2f82 | 2464 | struct trace_event_file * |
3cd715de SRRH |
2465 | find_event_file(struct trace_array *tr, const char *system, const char *event) |
2466 | { | |
7f1d2f82 | 2467 | struct trace_event_file *file; |
2425bcb9 | 2468 | struct trace_event_call *call; |
de7b2973 | 2469 | const char *name; |
3cd715de SRRH |
2470 | |
2471 | list_for_each_entry(file, &tr->events, list) { | |
2472 | ||
2473 | call = file->event_call; | |
687fcc4a | 2474 | name = trace_event_name(call); |
3cd715de | 2475 | |
de7b2973 | 2476 | if (!name || !call->class || !call->class->reg) |
3cd715de SRRH |
2477 | continue; |
2478 | ||
2479 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2480 | continue; | |
2481 | ||
de7b2973 | 2482 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
2483 | strcmp(system, call->class->system) == 0) |
2484 | return file; | |
2485 | } | |
2486 | return NULL; | |
2487 | } | |
2488 | ||
2875a08b SRRH |
2489 | #ifdef CONFIG_DYNAMIC_FTRACE |
2490 | ||
2491 | /* Avoid typos */ | |
2492 | #define ENABLE_EVENT_STR "enable_event" | |
2493 | #define DISABLE_EVENT_STR "disable_event" | |
2494 | ||
2495 | struct event_probe_data { | |
7f1d2f82 | 2496 | struct trace_event_file *file; |
2875a08b SRRH |
2497 | unsigned long count; |
2498 | int ref; | |
2499 | bool enable; | |
2500 | }; | |
2501 | ||
41794f19 SRV |
2502 | static void update_event_probe(struct event_probe_data *data) |
2503 | { | |
2504 | if (data->enable) | |
2505 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2506 | else | |
2507 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2508 | } | |
2509 | ||
3cd715de | 2510 | static void |
bca6c8d0 | 2511 | event_enable_probe(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 2512 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 2513 | void *data) |
3cd715de | 2514 | { |
6e444319 SRV |
2515 | struct ftrace_func_mapper *mapper = data; |
2516 | struct event_probe_data *edata; | |
41794f19 | 2517 | void **pdata; |
3cd715de | 2518 | |
41794f19 SRV |
2519 | pdata = ftrace_func_mapper_find_ip(mapper, ip); |
2520 | if (!pdata || !*pdata) | |
3cd715de SRRH |
2521 | return; |
2522 | ||
6e444319 SRV |
2523 | edata = *pdata; |
2524 | update_event_probe(edata); | |
3cd715de SRRH |
2525 | } |
2526 | ||
2527 | static void | |
bca6c8d0 | 2528 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 2529 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 2530 | void *data) |
3cd715de | 2531 | { |
6e444319 SRV |
2532 | struct ftrace_func_mapper *mapper = data; |
2533 | struct event_probe_data *edata; | |
41794f19 | 2534 | void **pdata; |
3cd715de | 2535 | |
41794f19 SRV |
2536 | pdata = ftrace_func_mapper_find_ip(mapper, ip); |
2537 | if (!pdata || !*pdata) | |
3cd715de SRRH |
2538 | return; |
2539 | ||
6e444319 | 2540 | edata = *pdata; |
41794f19 | 2541 | |
6e444319 | 2542 | if (!edata->count) |
3cd715de SRRH |
2543 | return; |
2544 | ||
2545 | /* Skip if the event is in a state we want to switch to */ | |
6e444319 | 2546 | if (edata->enable == !(edata->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
3cd715de SRRH |
2547 | return; |
2548 | ||
6e444319 SRV |
2549 | if (edata->count != -1) |
2550 | (edata->count)--; | |
3cd715de | 2551 | |
6e444319 | 2552 | update_event_probe(edata); |
3cd715de SRRH |
2553 | } |
2554 | ||
2555 | static int | |
2556 | event_enable_print(struct seq_file *m, unsigned long ip, | |
6e444319 | 2557 | struct ftrace_probe_ops *ops, void *data) |
3cd715de | 2558 | { |
6e444319 SRV |
2559 | struct ftrace_func_mapper *mapper = data; |
2560 | struct event_probe_data *edata; | |
41794f19 SRV |
2561 | void **pdata; |
2562 | ||
2563 | pdata = ftrace_func_mapper_find_ip(mapper, ip); | |
2564 | ||
2565 | if (WARN_ON_ONCE(!pdata || !*pdata)) | |
2566 | return 0; | |
2567 | ||
6e444319 | 2568 | edata = *pdata; |
3cd715de SRRH |
2569 | |
2570 | seq_printf(m, "%ps:", (void *)ip); | |
2571 | ||
2572 | seq_printf(m, "%s:%s:%s", | |
6e444319 SRV |
2573 | edata->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, |
2574 | edata->file->event_call->class->system, | |
2575 | trace_event_name(edata->file->event_call)); | |
3cd715de | 2576 | |
6e444319 | 2577 | if (edata->count == -1) |
fa6f0cc7 | 2578 | seq_puts(m, ":unlimited\n"); |
3cd715de | 2579 | else |
6e444319 | 2580 | seq_printf(m, ":count=%ld\n", edata->count); |
3cd715de SRRH |
2581 | |
2582 | return 0; | |
2583 | } | |
2584 | ||
2585 | static int | |
b5f081b5 | 2586 | event_enable_init(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 2587 | unsigned long ip, void *init_data, void **data) |
3cd715de | 2588 | { |
6e444319 SRV |
2589 | struct ftrace_func_mapper *mapper = *data; |
2590 | struct event_probe_data *edata = init_data; | |
41794f19 SRV |
2591 | int ret; |
2592 | ||
6e444319 SRV |
2593 | if (!mapper) { |
2594 | mapper = allocate_ftrace_func_mapper(); | |
2595 | if (!mapper) | |
2596 | return -ENODEV; | |
2597 | *data = mapper; | |
2598 | } | |
2599 | ||
2600 | ret = ftrace_func_mapper_add_ip(mapper, ip, edata); | |
41794f19 SRV |
2601 | if (ret < 0) |
2602 | return ret; | |
3cd715de | 2603 | |
6e444319 SRV |
2604 | edata->ref++; |
2605 | ||
2606 | return 0; | |
2607 | } | |
2608 | ||
2609 | static int free_probe_data(void *data) | |
2610 | { | |
2611 | struct event_probe_data *edata = data; | |
41794f19 | 2612 | |
6e444319 SRV |
2613 | edata->ref--; |
2614 | if (!edata->ref) { | |
2615 | /* Remove the SOFT_MODE flag */ | |
2616 | __ftrace_event_enable_disable(edata->file, 0, 1); | |
2617 | module_put(edata->file->event_call->mod); | |
2618 | kfree(edata); | |
2619 | } | |
3cd715de SRRH |
2620 | return 0; |
2621 | } | |
2622 | ||
2623 | static void | |
b5f081b5 | 2624 | event_enable_free(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 2625 | unsigned long ip, void *data) |
3cd715de | 2626 | { |
6e444319 SRV |
2627 | struct ftrace_func_mapper *mapper = data; |
2628 | struct event_probe_data *edata; | |
2629 | ||
2630 | if (!ip) { | |
2631 | if (!mapper) | |
2632 | return; | |
2633 | free_ftrace_func_mapper(mapper, free_probe_data); | |
2634 | return; | |
2635 | } | |
41794f19 | 2636 | |
6e444319 | 2637 | edata = ftrace_func_mapper_remove_ip(mapper, ip); |
41794f19 | 2638 | |
6e444319 | 2639 | if (WARN_ON_ONCE(!edata)) |
41794f19 | 2640 | return; |
3cd715de | 2641 | |
6e444319 | 2642 | if (WARN_ON_ONCE(edata->ref <= 0)) |
3cd715de SRRH |
2643 | return; |
2644 | ||
6e444319 | 2645 | free_probe_data(edata); |
3cd715de SRRH |
2646 | } |
2647 | ||
2648 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2649 | .func = event_enable_probe, | |
2650 | .print = event_enable_print, | |
2651 | .init = event_enable_init, | |
2652 | .free = event_enable_free, | |
2653 | }; | |
2654 | ||
2655 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
2656 | .func = event_enable_count_probe, | |
2657 | .print = event_enable_print, | |
2658 | .init = event_enable_init, | |
2659 | .free = event_enable_free, | |
2660 | }; | |
2661 | ||
2662 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
2663 | .func = event_enable_probe, | |
2664 | .print = event_enable_print, | |
2665 | .init = event_enable_init, | |
2666 | .free = event_enable_free, | |
2667 | }; | |
2668 | ||
2669 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2670 | .func = event_enable_count_probe, | |
2671 | .print = event_enable_print, | |
2672 | .init = event_enable_init, | |
2673 | .free = event_enable_free, | |
2674 | }; | |
2675 | ||
2676 | static int | |
04ec7bb6 | 2677 | event_enable_func(struct trace_array *tr, struct ftrace_hash *hash, |
3cd715de SRRH |
2678 | char *glob, char *cmd, char *param, int enabled) |
2679 | { | |
7f1d2f82 | 2680 | struct trace_event_file *file; |
3cd715de SRRH |
2681 | struct ftrace_probe_ops *ops; |
2682 | struct event_probe_data *data; | |
2683 | const char *system; | |
2684 | const char *event; | |
2685 | char *number; | |
2686 | bool enable; | |
2687 | int ret; | |
2688 | ||
dc81e5e3 YY |
2689 | if (!tr) |
2690 | return -ENODEV; | |
2691 | ||
3cd715de | 2692 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 2693 | if (!enabled || !param) |
3cd715de SRRH |
2694 | return -EINVAL; |
2695 | ||
2696 | system = strsep(¶m, ":"); | |
2697 | if (!param) | |
2698 | return -EINVAL; | |
2699 | ||
2700 | event = strsep(¶m, ":"); | |
2701 | ||
2702 | mutex_lock(&event_mutex); | |
2703 | ||
2704 | ret = -EINVAL; | |
2705 | file = find_event_file(tr, system, event); | |
2706 | if (!file) | |
2707 | goto out; | |
2708 | ||
2709 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2710 | ||
2711 | if (enable) | |
2712 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2713 | else | |
2714 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2715 | ||
2716 | if (glob[0] == '!') { | |
7b60f3d8 | 2717 | ret = unregister_ftrace_function_probe_func(glob+1, tr, ops); |
3cd715de SRRH |
2718 | goto out; |
2719 | } | |
2720 | ||
2721 | ret = -ENOMEM; | |
41794f19 | 2722 | |
3cd715de SRRH |
2723 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
2724 | if (!data) | |
2725 | goto out; | |
2726 | ||
2727 | data->enable = enable; | |
2728 | data->count = -1; | |
2729 | data->file = file; | |
2730 | ||
2731 | if (!param) | |
2732 | goto out_reg; | |
2733 | ||
2734 | number = strsep(¶m, ":"); | |
2735 | ||
2736 | ret = -EINVAL; | |
2737 | if (!strlen(number)) | |
2738 | goto out_free; | |
2739 | ||
2740 | /* | |
2741 | * We use the callback data field (which is a pointer) | |
2742 | * as our counter. | |
2743 | */ | |
2744 | ret = kstrtoul(number, 0, &data->count); | |
2745 | if (ret) | |
2746 | goto out_free; | |
2747 | ||
2748 | out_reg: | |
2749 | /* Don't let event modules unload while probe registered */ | |
2750 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2751 | if (!ret) { |
2752 | ret = -EBUSY; | |
3cd715de | 2753 | goto out_free; |
6ed01066 | 2754 | } |
3cd715de SRRH |
2755 | |
2756 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2757 | if (ret < 0) | |
2758 | goto out_put; | |
41794f19 | 2759 | |
04ec7bb6 | 2760 | ret = register_ftrace_function_probe(glob, tr, ops, data); |
ff305ded SRRH |
2761 | /* |
2762 | * The above returns on success the # of functions enabled, | |
2763 | * but if it didn't find any functions it returns zero. | |
2764 | * Consider no functions a failure too. | |
2765 | */ | |
a5b85bd1 MH |
2766 | if (!ret) { |
2767 | ret = -ENOENT; | |
3cd715de | 2768 | goto out_disable; |
ff305ded SRRH |
2769 | } else if (ret < 0) |
2770 | goto out_disable; | |
2771 | /* Just return zero, not the number of enabled functions */ | |
2772 | ret = 0; | |
3cd715de SRRH |
2773 | out: |
2774 | mutex_unlock(&event_mutex); | |
2775 | return ret; | |
2776 | ||
2777 | out_disable: | |
2778 | __ftrace_event_enable_disable(file, 0, 1); | |
2779 | out_put: | |
2780 | module_put(file->event_call->mod); | |
2781 | out_free: | |
2782 | kfree(data); | |
2783 | goto out; | |
2784 | } | |
2785 | ||
2786 | static struct ftrace_func_command event_enable_cmd = { | |
2787 | .name = ENABLE_EVENT_STR, | |
2788 | .func = event_enable_func, | |
2789 | }; | |
2790 | ||
2791 | static struct ftrace_func_command event_disable_cmd = { | |
2792 | .name = DISABLE_EVENT_STR, | |
2793 | .func = event_enable_func, | |
2794 | }; | |
2795 | ||
2796 | static __init int register_event_cmds(void) | |
2797 | { | |
2798 | int ret; | |
2799 | ||
2800 | ret = register_ftrace_command(&event_enable_cmd); | |
2801 | if (WARN_ON(ret < 0)) | |
2802 | return ret; | |
2803 | ret = register_ftrace_command(&event_disable_cmd); | |
2804 | if (WARN_ON(ret < 0)) | |
2805 | unregister_ftrace_command(&event_enable_cmd); | |
2806 | return ret; | |
2807 | } | |
2808 | #else | |
2809 | static inline int register_event_cmds(void) { return 0; } | |
2810 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2811 | ||
77248221 | 2812 | /* |
7f1d2f82 | 2813 | * The top level array has already had its trace_event_file |
77248221 | 2814 | * descriptors created in order to allow for early events to |
8434dc93 | 2815 | * be recorded. This function is called after the tracefs has been |
77248221 SR |
2816 | * initialized, and we now have to create the files associated |
2817 | * to the events. | |
2818 | */ | |
2819 | static __init void | |
2820 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2821 | { | |
7f1d2f82 | 2822 | struct trace_event_file *file; |
77248221 SR |
2823 | int ret; |
2824 | ||
2825 | ||
2826 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 2827 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 2828 | if (ret < 0) |
3448bac3 | 2829 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2830 | trace_event_name(file->event_call)); |
77248221 SR |
2831 | } |
2832 | } | |
2833 | ||
2834 | /* | |
2835 | * For early boot up, the top trace array requires to have | |
2836 | * a list of events that can be enabled. This must be done before | |
2837 | * the filesystem is set up in order to allow events to be traced | |
2838 | * early. | |
2839 | */ | |
2840 | static __init void | |
2841 | __trace_early_add_events(struct trace_array *tr) | |
2842 | { | |
2425bcb9 | 2843 | struct trace_event_call *call; |
77248221 SR |
2844 | int ret; |
2845 | ||
2846 | list_for_each_entry(call, &ftrace_events, list) { | |
2847 | /* Early boot up should not have any modules loaded */ | |
2848 | if (WARN_ON_ONCE(call->mod)) | |
2849 | continue; | |
2850 | ||
2851 | ret = __trace_early_add_new_event(call, tr); | |
2852 | if (ret < 0) | |
3448bac3 | 2853 | pr_warn("Could not create early event %s\n", |
687fcc4a | 2854 | trace_event_name(call)); |
77248221 SR |
2855 | } |
2856 | } | |
2857 | ||
0c8916c3 SR |
2858 | /* Remove the event directory structure for a trace directory. */ |
2859 | static void | |
2860 | __trace_remove_event_dirs(struct trace_array *tr) | |
2861 | { | |
7f1d2f82 | 2862 | struct trace_event_file *file, *next; |
0c8916c3 | 2863 | |
f6a84bdc ON |
2864 | list_for_each_entry_safe(file, next, &tr->events, list) |
2865 | remove_event_file_dir(file); | |
0c8916c3 SR |
2866 | } |
2867 | ||
2425bcb9 | 2868 | static void __add_event_to_tracers(struct trace_event_call *call) |
ae63b31e SR |
2869 | { |
2870 | struct trace_array *tr; | |
2871 | ||
620a30e9 ON |
2872 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
2873 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
2874 | } |
2875 | ||
2425bcb9 SRRH |
2876 | extern struct trace_event_call *__start_ftrace_events[]; |
2877 | extern struct trace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2878 | |
020e5f85 LZ |
2879 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2880 | ||
2881 | static __init int setup_trace_event(char *str) | |
2882 | { | |
2883 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2884 | ring_buffer_expanded = true; |
2885 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2886 | |
2887 | return 1; | |
2888 | } | |
2889 | __setup("trace_event=", setup_trace_event); | |
2890 | ||
77248221 SR |
2891 | /* Expects to have event_mutex held when called */ |
2892 | static int | |
2893 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2894 | { |
2895 | struct dentry *d_events; | |
2896 | struct dentry *entry; | |
2897 | ||
8434dc93 | 2898 | entry = tracefs_create_file("set_event", 0644, parent, |
ae63b31e SR |
2899 | tr, &ftrace_set_event_fops); |
2900 | if (!entry) { | |
8434dc93 | 2901 | pr_warn("Could not create tracefs 'set_event' entry\n"); |
ae63b31e SR |
2902 | return -ENOMEM; |
2903 | } | |
2904 | ||
8434dc93 | 2905 | d_events = tracefs_create_dir("events", parent); |
277ba044 | 2906 | if (!d_events) { |
8434dc93 | 2907 | pr_warn("Could not create tracefs 'events' directory\n"); |
277ba044 SR |
2908 | return -ENOMEM; |
2909 | } | |
ae63b31e | 2910 | |
7d436400 SRRH |
2911 | entry = trace_create_file("enable", 0644, d_events, |
2912 | tr, &ftrace_tr_enable_fops); | |
2913 | if (!entry) { | |
2914 | pr_warn("Could not create tracefs 'enable' entry\n"); | |
2915 | return -ENOMEM; | |
2916 | } | |
2917 | ||
2918 | /* There are not as crucial, just warn if they are not created */ | |
2919 | ||
49090107 SRRH |
2920 | entry = tracefs_create_file("set_event_pid", 0644, parent, |
2921 | tr, &ftrace_set_event_pid_fops); | |
7d436400 SRRH |
2922 | if (!entry) |
2923 | pr_warn("Could not create tracefs 'set_event_pid' entry\n"); | |
49090107 | 2924 | |
ae63b31e | 2925 | /* ring buffer internal formats */ |
7d436400 SRRH |
2926 | entry = trace_create_file("header_page", 0444, d_events, |
2927 | ring_buffer_print_page_header, | |
2928 | &ftrace_show_header_fops); | |
2929 | if (!entry) | |
2930 | pr_warn("Could not create tracefs 'header_page' entry\n"); | |
2931 | ||
2932 | entry = trace_create_file("header_event", 0444, d_events, | |
2933 | ring_buffer_print_entry_header, | |
2934 | &ftrace_show_header_fops); | |
2935 | if (!entry) | |
2936 | pr_warn("Could not create tracefs 'header_event' entry\n"); | |
ae63b31e SR |
2937 | |
2938 | tr->event_dir = d_events; | |
77248221 SR |
2939 | |
2940 | return 0; | |
2941 | } | |
2942 | ||
2943 | /** | |
2944 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2945 | * @parent: The parent dentry to place the files/directories for events in | |
2946 | * @tr: The trace array associated with these events | |
2947 | * | |
2948 | * When a new instance is created, it needs to set up its events | |
2949 | * directory, as well as other files associated with events. It also | |
2950 | * creates the event hierachry in the @parent/events directory. | |
2951 | * | |
2952 | * Returns 0 on success. | |
2953 | */ | |
2954 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2955 | { | |
2956 | int ret; | |
2957 | ||
2958 | mutex_lock(&event_mutex); | |
2959 | ||
2960 | ret = create_event_toplevel_files(parent, tr); | |
2961 | if (ret) | |
2962 | goto out_unlock; | |
2963 | ||
52f6ad6d | 2964 | down_write(&trace_event_sem); |
ae63b31e | 2965 | __trace_add_event_dirs(tr); |
52f6ad6d | 2966 | up_write(&trace_event_sem); |
277ba044 | 2967 | |
77248221 | 2968 | out_unlock: |
277ba044 | 2969 | mutex_unlock(&event_mutex); |
ae63b31e | 2970 | |
77248221 SR |
2971 | return ret; |
2972 | } | |
2973 | ||
2974 | /* | |
2975 | * The top trace array already had its file descriptors created. | |
2976 | * Now the files themselves need to be created. | |
2977 | */ | |
2978 | static __init int | |
2979 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2980 | { | |
2981 | int ret; | |
2982 | ||
2983 | mutex_lock(&event_mutex); | |
2984 | ||
2985 | ret = create_event_toplevel_files(parent, tr); | |
2986 | if (ret) | |
2987 | goto out_unlock; | |
2988 | ||
52f6ad6d | 2989 | down_write(&trace_event_sem); |
77248221 | 2990 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 2991 | up_write(&trace_event_sem); |
77248221 SR |
2992 | |
2993 | out_unlock: | |
2994 | mutex_unlock(&event_mutex); | |
2995 | ||
2996 | return ret; | |
ae63b31e SR |
2997 | } |
2998 | ||
0c8916c3 SR |
2999 | int event_trace_del_tracer(struct trace_array *tr) |
3000 | { | |
0c8916c3 SR |
3001 | mutex_lock(&event_mutex); |
3002 | ||
85f2b082 TZ |
3003 | /* Disable any event triggers and associated soft-disabled events */ |
3004 | clear_event_triggers(tr); | |
3005 | ||
49090107 SRRH |
3006 | /* Clear the pid list */ |
3007 | __ftrace_clear_event_pids(tr); | |
3008 | ||
2a6c24af SRRH |
3009 | /* Disable any running events */ |
3010 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
3011 | ||
3ccb0123 SR |
3012 | /* Access to events are within rcu_read_lock_sched() */ |
3013 | synchronize_sched(); | |
3014 | ||
52f6ad6d | 3015 | down_write(&trace_event_sem); |
0c8916c3 | 3016 | __trace_remove_event_dirs(tr); |
8434dc93 | 3017 | tracefs_remove_recursive(tr->event_dir); |
52f6ad6d | 3018 | up_write(&trace_event_sem); |
0c8916c3 SR |
3019 | |
3020 | tr->event_dir = NULL; | |
3021 | ||
3022 | mutex_unlock(&event_mutex); | |
3023 | ||
3024 | return 0; | |
3025 | } | |
3026 | ||
d1a29143 SR |
3027 | static __init int event_trace_memsetup(void) |
3028 | { | |
3029 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
7f1d2f82 | 3030 | file_cachep = KMEM_CACHE(trace_event_file, SLAB_PANIC); |
d1a29143 SR |
3031 | return 0; |
3032 | } | |
3033 | ||
ce1039bd SRRH |
3034 | static __init void |
3035 | early_enable_events(struct trace_array *tr, bool disable_first) | |
3036 | { | |
3037 | char *buf = bootup_event_buf; | |
3038 | char *token; | |
3039 | int ret; | |
3040 | ||
3041 | while (true) { | |
3042 | token = strsep(&buf, ","); | |
3043 | ||
3044 | if (!token) | |
3045 | break; | |
ce1039bd | 3046 | |
43ed3843 SRRH |
3047 | if (*token) { |
3048 | /* Restarting syscalls requires that we stop them first */ | |
3049 | if (disable_first) | |
3050 | ftrace_set_clr_event(tr, token, 0); | |
ce1039bd | 3051 | |
43ed3843 SRRH |
3052 | ret = ftrace_set_clr_event(tr, token, 1); |
3053 | if (ret) | |
3054 | pr_warn("Failed to enable trace event: %s\n", token); | |
3055 | } | |
ce1039bd SRRH |
3056 | |
3057 | /* Put back the comma to allow this to be called again */ | |
3058 | if (buf) | |
3059 | *(buf - 1) = ','; | |
3060 | } | |
3061 | } | |
3062 | ||
8781915a EG |
3063 | static __init int event_trace_enable(void) |
3064 | { | |
ae63b31e | 3065 | struct trace_array *tr = top_trace_array(); |
2425bcb9 | 3066 | struct trace_event_call **iter, *call; |
8781915a EG |
3067 | int ret; |
3068 | ||
dc81e5e3 YY |
3069 | if (!tr) |
3070 | return -ENODEV; | |
3071 | ||
8781915a EG |
3072 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
3073 | ||
3074 | call = *iter; | |
3075 | ret = event_init(call); | |
3076 | if (!ret) | |
3077 | list_add(&call->list, &ftrace_events); | |
3078 | } | |
3079 | ||
77248221 SR |
3080 | /* |
3081 | * We need the top trace array to have a working set of trace | |
3082 | * points at early init, before the debug files and directories | |
3083 | * are created. Create the file entries now, and attach them | |
3084 | * to the actual file dentries later. | |
3085 | */ | |
3086 | __trace_early_add_events(tr); | |
3087 | ||
ce1039bd | 3088 | early_enable_events(tr, false); |
81698831 SR |
3089 | |
3090 | trace_printk_start_comm(); | |
3091 | ||
3cd715de SRRH |
3092 | register_event_cmds(); |
3093 | ||
85f2b082 TZ |
3094 | register_trigger_cmds(); |
3095 | ||
8781915a EG |
3096 | return 0; |
3097 | } | |
3098 | ||
ce1039bd SRRH |
3099 | /* |
3100 | * event_trace_enable() is called from trace_event_init() first to | |
3101 | * initialize events and perhaps start any events that are on the | |
3102 | * command line. Unfortunately, there are some events that will not | |
3103 | * start this early, like the system call tracepoints that need | |
3104 | * to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable() | |
3105 | * is called before pid 1 starts, and this flag is never set, making | |
3106 | * the syscall tracepoint never get reached, but the event is enabled | |
3107 | * regardless (and not doing anything). | |
3108 | */ | |
3109 | static __init int event_trace_enable_again(void) | |
3110 | { | |
3111 | struct trace_array *tr; | |
3112 | ||
3113 | tr = top_trace_array(); | |
3114 | if (!tr) | |
3115 | return -ENODEV; | |
3116 | ||
3117 | early_enable_events(tr, true); | |
3118 | ||
3119 | return 0; | |
3120 | } | |
3121 | ||
3122 | early_initcall(event_trace_enable_again); | |
3123 | ||
b77e38aa SR |
3124 | static __init int event_trace_init(void) |
3125 | { | |
ae63b31e | 3126 | struct trace_array *tr; |
b77e38aa SR |
3127 | struct dentry *d_tracer; |
3128 | struct dentry *entry; | |
6d723736 | 3129 | int ret; |
b77e38aa | 3130 | |
ae63b31e | 3131 | tr = top_trace_array(); |
dc81e5e3 YY |
3132 | if (!tr) |
3133 | return -ENODEV; | |
ae63b31e | 3134 | |
b77e38aa | 3135 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 3136 | if (IS_ERR(d_tracer)) |
b77e38aa SR |
3137 | return 0; |
3138 | ||
8434dc93 | 3139 | entry = tracefs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 3140 | tr, &ftrace_avail_fops); |
2314c4ae | 3141 | if (!entry) |
8434dc93 | 3142 | pr_warn("Could not create tracefs 'available_events' entry\n"); |
2314c4ae | 3143 | |
9f616680 DW |
3144 | if (trace_define_generic_fields()) |
3145 | pr_warn("tracing: Failed to allocated generic fields"); | |
3146 | ||
8728fe50 | 3147 | if (trace_define_common_fields()) |
3448bac3 | 3148 | pr_warn("tracing: Failed to allocate common fields"); |
8728fe50 | 3149 | |
77248221 | 3150 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
3151 | if (ret) |
3152 | return ret; | |
020e5f85 | 3153 | |
836d481e | 3154 | #ifdef CONFIG_MODULES |
6d723736 | 3155 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 3156 | if (ret) |
3448bac3 | 3157 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 3158 | #endif |
b77e38aa SR |
3159 | return 0; |
3160 | } | |
5f893b26 SRRH |
3161 | |
3162 | void __init trace_event_init(void) | |
3163 | { | |
3164 | event_trace_memsetup(); | |
3165 | init_ftrace_syscalls(); | |
3166 | event_trace_enable(); | |
3167 | } | |
3168 | ||
b77e38aa | 3169 | fs_initcall(event_trace_init); |
e6187007 SR |
3170 | |
3171 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
3172 | ||
3173 | static DEFINE_SPINLOCK(test_spinlock); | |
3174 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
3175 | static DEFINE_MUTEX(test_mutex); | |
3176 | ||
3177 | static __init void test_work(struct work_struct *dummy) | |
3178 | { | |
3179 | spin_lock(&test_spinlock); | |
3180 | spin_lock_irq(&test_spinlock_irq); | |
3181 | udelay(1); | |
3182 | spin_unlock_irq(&test_spinlock_irq); | |
3183 | spin_unlock(&test_spinlock); | |
3184 | ||
3185 | mutex_lock(&test_mutex); | |
3186 | msleep(1); | |
3187 | mutex_unlock(&test_mutex); | |
3188 | } | |
3189 | ||
3190 | static __init int event_test_thread(void *unused) | |
3191 | { | |
3192 | void *test_malloc; | |
3193 | ||
3194 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
3195 | if (!test_malloc) | |
3196 | pr_info("failed to kmalloc\n"); | |
3197 | ||
3198 | schedule_on_each_cpu(test_work); | |
3199 | ||
3200 | kfree(test_malloc); | |
3201 | ||
3202 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 3203 | while (!kthread_should_stop()) { |
e6187007 | 3204 | schedule(); |
fe0e01c7 PZ |
3205 | set_current_state(TASK_INTERRUPTIBLE); |
3206 | } | |
3207 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
3208 | |
3209 | return 0; | |
3210 | } | |
3211 | ||
3212 | /* | |
3213 | * Do various things that may trigger events. | |
3214 | */ | |
3215 | static __init void event_test_stuff(void) | |
3216 | { | |
3217 | struct task_struct *test_thread; | |
3218 | ||
3219 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
3220 | msleep(1); | |
3221 | kthread_stop(test_thread); | |
3222 | } | |
3223 | ||
3224 | /* | |
3225 | * For every trace event defined, we will test each trace point separately, | |
3226 | * and then by groups, and finally all trace points. | |
3227 | */ | |
9ea21c1e | 3228 | static __init void event_trace_self_tests(void) |
e6187007 | 3229 | { |
7967b3e0 | 3230 | struct trace_subsystem_dir *dir; |
7f1d2f82 | 3231 | struct trace_event_file *file; |
2425bcb9 | 3232 | struct trace_event_call *call; |
e6187007 | 3233 | struct event_subsystem *system; |
ae63b31e | 3234 | struct trace_array *tr; |
e6187007 SR |
3235 | int ret; |
3236 | ||
ae63b31e | 3237 | tr = top_trace_array(); |
dc81e5e3 YY |
3238 | if (!tr) |
3239 | return; | |
ae63b31e | 3240 | |
e6187007 SR |
3241 | pr_info("Running tests on trace events:\n"); |
3242 | ||
ae63b31e SR |
3243 | list_for_each_entry(file, &tr->events, list) { |
3244 | ||
3245 | call = file->event_call; | |
e6187007 | 3246 | |
2239291a SR |
3247 | /* Only test those that have a probe */ |
3248 | if (!call->class || !call->class->probe) | |
e6187007 SR |
3249 | continue; |
3250 | ||
1f5a6b45 SR |
3251 | /* |
3252 | * Testing syscall events here is pretty useless, but | |
3253 | * we still do it if configured. But this is time consuming. | |
3254 | * What we really need is a user thread to perform the | |
3255 | * syscalls as we test. | |
3256 | */ | |
3257 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
3258 | if (call->class->system && |
3259 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
3260 | continue; |
3261 | #endif | |
3262 | ||
687fcc4a | 3263 | pr_info("Testing event %s: ", trace_event_name(call)); |
e6187007 SR |
3264 | |
3265 | /* | |
3266 | * If an event is already enabled, someone is using | |
3267 | * it and the self test should not be on. | |
3268 | */ | |
5d6ad960 | 3269 | if (file->flags & EVENT_FILE_FL_ENABLED) { |
3448bac3 | 3270 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
3271 | WARN_ON_ONCE(1); |
3272 | continue; | |
3273 | } | |
3274 | ||
ae63b31e | 3275 | ftrace_event_enable_disable(file, 1); |
e6187007 | 3276 | event_test_stuff(); |
ae63b31e | 3277 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
3278 | |
3279 | pr_cont("OK\n"); | |
3280 | } | |
3281 | ||
3282 | /* Now test at the sub system level */ | |
3283 | ||
3284 | pr_info("Running tests on trace event systems:\n"); | |
3285 | ||
ae63b31e SR |
3286 | list_for_each_entry(dir, &tr->systems, list) { |
3287 | ||
3288 | system = dir->subsystem; | |
e6187007 SR |
3289 | |
3290 | /* the ftrace system is special, skip it */ | |
3291 | if (strcmp(system->name, "ftrace") == 0) | |
3292 | continue; | |
3293 | ||
3294 | pr_info("Testing event system %s: ", system->name); | |
3295 | ||
ae63b31e | 3296 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 3297 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3298 | pr_warn("error enabling system %s\n", |
3299 | system->name); | |
e6187007 SR |
3300 | continue; |
3301 | } | |
3302 | ||
3303 | event_test_stuff(); | |
3304 | ||
ae63b31e | 3305 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 3306 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3307 | pr_warn("error disabling system %s\n", |
3308 | system->name); | |
76bab1b7 YL |
3309 | continue; |
3310 | } | |
e6187007 SR |
3311 | |
3312 | pr_cont("OK\n"); | |
3313 | } | |
3314 | ||
3315 | /* Test with all events enabled */ | |
3316 | ||
3317 | pr_info("Running tests on all trace events:\n"); | |
3318 | pr_info("Testing all events: "); | |
3319 | ||
ae63b31e | 3320 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 3321 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3322 | pr_warn("error enabling all events\n"); |
9ea21c1e | 3323 | return; |
e6187007 SR |
3324 | } |
3325 | ||
3326 | event_test_stuff(); | |
3327 | ||
3328 | /* reset sysname */ | |
ae63b31e | 3329 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 3330 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3331 | pr_warn("error disabling all events\n"); |
9ea21c1e | 3332 | return; |
e6187007 SR |
3333 | } |
3334 | ||
3335 | pr_cont("OK\n"); | |
9ea21c1e SR |
3336 | } |
3337 | ||
3338 | #ifdef CONFIG_FUNCTION_TRACER | |
3339 | ||
245b2e70 | 3340 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e | 3341 | |
9b9db275 | 3342 | static struct trace_event_file event_trace_file __initdata; |
b7f0c959 SRRH |
3343 | |
3344 | static void __init | |
2f5f6ad9 | 3345 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 3346 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
3347 | { |
3348 | struct ring_buffer_event *event; | |
e77405ad | 3349 | struct ring_buffer *buffer; |
9ea21c1e SR |
3350 | struct ftrace_entry *entry; |
3351 | unsigned long flags; | |
3352 | long disabled; | |
9ea21c1e SR |
3353 | int cpu; |
3354 | int pc; | |
3355 | ||
3356 | pc = preempt_count(); | |
5168ae50 | 3357 | preempt_disable_notrace(); |
9ea21c1e | 3358 | cpu = raw_smp_processor_id(); |
245b2e70 | 3359 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
3360 | |
3361 | if (disabled != 1) | |
3362 | goto out; | |
3363 | ||
3364 | local_save_flags(flags); | |
3365 | ||
9b9db275 SRRH |
3366 | event = trace_event_buffer_lock_reserve(&buffer, &event_trace_file, |
3367 | TRACE_FN, sizeof(*entry), | |
3368 | flags, pc); | |
9ea21c1e SR |
3369 | if (!event) |
3370 | goto out; | |
3371 | entry = ring_buffer_event_data(event); | |
3372 | entry->ip = ip; | |
3373 | entry->parent_ip = parent_ip; | |
3374 | ||
9b9db275 SRRH |
3375 | event_trigger_unlock_commit(&event_trace_file, buffer, event, |
3376 | entry, flags, pc); | |
9ea21c1e | 3377 | out: |
245b2e70 | 3378 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 3379 | preempt_enable_notrace(); |
9ea21c1e SR |
3380 | } |
3381 | ||
3382 | static struct ftrace_ops trace_ops __initdata = | |
3383 | { | |
3384 | .func = function_test_events_call, | |
4740974a | 3385 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
3386 | }; |
3387 | ||
3388 | static __init void event_trace_self_test_with_function(void) | |
3389 | { | |
17bb615a | 3390 | int ret; |
9b9db275 SRRH |
3391 | |
3392 | event_trace_file.tr = top_trace_array(); | |
3393 | if (WARN_ON(!event_trace_file.tr)) | |
2d34f489 | 3394 | return; |
9b9db275 | 3395 | |
17bb615a SR |
3396 | ret = register_ftrace_function(&trace_ops); |
3397 | if (WARN_ON(ret < 0)) { | |
3398 | pr_info("Failed to enable function tracer for event tests\n"); | |
3399 | return; | |
3400 | } | |
9ea21c1e SR |
3401 | pr_info("Running tests again, along with the function tracer\n"); |
3402 | event_trace_self_tests(); | |
3403 | unregister_ftrace_function(&trace_ops); | |
3404 | } | |
3405 | #else | |
3406 | static __init void event_trace_self_test_with_function(void) | |
3407 | { | |
3408 | } | |
3409 | #endif | |
3410 | ||
3411 | static __init int event_trace_self_tests_init(void) | |
3412 | { | |
020e5f85 LZ |
3413 | if (!tracing_selftest_disabled) { |
3414 | event_trace_self_tests(); | |
3415 | event_trace_self_test_with_function(); | |
3416 | } | |
e6187007 SR |
3417 | |
3418 | return 0; | |
3419 | } | |
3420 | ||
28d20e2d | 3421 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
3422 | |
3423 | #endif |