Commit | Line | Data |
---|---|---|
bcea3f96 | 1 | // SPDX-License-Identifier: GPL-2.0 |
b77e38aa SR |
2 | /* |
3 | * event tracer | |
4 | * | |
5 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
6 | * | |
981d081e SR |
7 | * - Added format output of fields of the trace point. |
8 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
9 | * | |
b77e38aa SR |
10 | */ |
11 | ||
3448bac3 FF |
12 | #define pr_fmt(fmt) fmt |
13 | ||
e6187007 SR |
14 | #include <linux/workqueue.h> |
15 | #include <linux/spinlock.h> | |
16 | #include <linux/kthread.h> | |
8434dc93 | 17 | #include <linux/tracefs.h> |
b77e38aa SR |
18 | #include <linux/uaccess.h> |
19 | #include <linux/module.h> | |
20 | #include <linux/ctype.h> | |
49090107 | 21 | #include <linux/sort.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
e6187007 | 23 | #include <linux/delay.h> |
b77e38aa | 24 | |
3fdaf80f SRRH |
25 | #include <trace/events/sched.h> |
26 | ||
020e5f85 LZ |
27 | #include <asm/setup.h> |
28 | ||
91729ef9 | 29 | #include "trace_output.h" |
b77e38aa | 30 | |
4e5292ea | 31 | #undef TRACE_SYSTEM |
b628b3e6 SR |
32 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
33 | ||
20c8928a | 34 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 35 | |
a59fd602 | 36 | LIST_HEAD(ftrace_events); |
9f616680 | 37 | static LIST_HEAD(ftrace_generic_fields); |
b3a8c6fd | 38 | static LIST_HEAD(ftrace_common_fields); |
a59fd602 | 39 | |
d1a29143 SR |
40 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
41 | ||
42 | static struct kmem_cache *field_cachep; | |
43 | static struct kmem_cache *file_cachep; | |
44 | ||
6e94a780 SR |
45 | static inline int system_refcount(struct event_subsystem *system) |
46 | { | |
79ac6ef5 | 47 | return system->ref_count; |
6e94a780 SR |
48 | } |
49 | ||
50 | static int system_refcount_inc(struct event_subsystem *system) | |
51 | { | |
79ac6ef5 | 52 | return system->ref_count++; |
6e94a780 SR |
53 | } |
54 | ||
55 | static int system_refcount_dec(struct event_subsystem *system) | |
56 | { | |
79ac6ef5 | 57 | return --system->ref_count; |
6e94a780 SR |
58 | } |
59 | ||
ae63b31e SR |
60 | /* Double loops, do not use break, only goto's work */ |
61 | #define do_for_each_event_file(tr, file) \ | |
62 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
63 | list_for_each_entry(file, &tr->events, list) | |
64 | ||
65 | #define do_for_each_event_file_safe(tr, file) \ | |
66 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
7f1d2f82 | 67 | struct trace_event_file *___n; \ |
ae63b31e SR |
68 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
69 | ||
70 | #define while_for_each_event_file() \ | |
71 | } | |
72 | ||
b3a8c6fd J |
73 | static struct ftrace_event_field * |
74 | __find_event_field(struct list_head *head, char *name) | |
75 | { | |
76 | struct ftrace_event_field *field; | |
77 | ||
78 | list_for_each_entry(field, head, link) { | |
79 | if (!strcmp(field->name, name)) | |
80 | return field; | |
81 | } | |
82 | ||
83 | return NULL; | |
84 | } | |
85 | ||
86 | struct ftrace_event_field * | |
2425bcb9 | 87 | trace_find_event_field(struct trace_event_call *call, char *name) |
b3a8c6fd J |
88 | { |
89 | struct ftrace_event_field *field; | |
90 | struct list_head *head; | |
91 | ||
e57cbaf0 SRRH |
92 | head = trace_get_fields(call); |
93 | field = __find_event_field(head, name); | |
9f616680 DW |
94 | if (field) |
95 | return field; | |
96 | ||
e57cbaf0 | 97 | field = __find_event_field(&ftrace_generic_fields, name); |
b3a8c6fd J |
98 | if (field) |
99 | return field; | |
100 | ||
e57cbaf0 | 101 | return __find_event_field(&ftrace_common_fields, name); |
b3a8c6fd J |
102 | } |
103 | ||
8728fe50 LZ |
104 | static int __trace_define_field(struct list_head *head, const char *type, |
105 | const char *name, int offset, int size, | |
106 | int is_signed, int filter_type) | |
cf027f64 TZ |
107 | { |
108 | struct ftrace_event_field *field; | |
109 | ||
d1a29143 | 110 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 111 | if (!field) |
aaf6ac0f | 112 | return -ENOMEM; |
fe9f57f2 | 113 | |
92edca07 SR |
114 | field->name = name; |
115 | field->type = type; | |
fe9f57f2 | 116 | |
43b51ead LZ |
117 | if (filter_type == FILTER_OTHER) |
118 | field->filter_type = filter_assign_type(type); | |
119 | else | |
120 | field->filter_type = filter_type; | |
121 | ||
cf027f64 TZ |
122 | field->offset = offset; |
123 | field->size = size; | |
a118e4d1 | 124 | field->is_signed = is_signed; |
aa38e9fc | 125 | |
2e33af02 | 126 | list_add(&field->link, head); |
cf027f64 TZ |
127 | |
128 | return 0; | |
cf027f64 | 129 | } |
8728fe50 | 130 | |
2425bcb9 | 131 | int trace_define_field(struct trace_event_call *call, const char *type, |
8728fe50 LZ |
132 | const char *name, int offset, int size, int is_signed, |
133 | int filter_type) | |
134 | { | |
135 | struct list_head *head; | |
136 | ||
137 | if (WARN_ON(!call->class)) | |
138 | return 0; | |
139 | ||
140 | head = trace_get_fields(call); | |
141 | return __trace_define_field(head, type, name, offset, size, | |
142 | is_signed, filter_type); | |
143 | } | |
17c873ec | 144 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 145 | |
9f616680 DW |
146 | #define __generic_field(type, item, filter_type) \ |
147 | ret = __trace_define_field(&ftrace_generic_fields, #type, \ | |
148 | #item, 0, 0, is_signed_type(type), \ | |
149 | filter_type); \ | |
150 | if (ret) \ | |
151 | return ret; | |
152 | ||
e647d6b3 | 153 | #define __common_field(type, item) \ |
8728fe50 LZ |
154 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
155 | "common_" #item, \ | |
156 | offsetof(typeof(ent), item), \ | |
157 | sizeof(ent.item), \ | |
158 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
159 | if (ret) \ |
160 | return ret; | |
161 | ||
9f616680 DW |
162 | static int trace_define_generic_fields(void) |
163 | { | |
164 | int ret; | |
165 | ||
e57cbaf0 SRRH |
166 | __generic_field(int, CPU, FILTER_CPU); |
167 | __generic_field(int, cpu, FILTER_CPU); | |
168 | __generic_field(char *, COMM, FILTER_COMM); | |
169 | __generic_field(char *, comm, FILTER_COMM); | |
9f616680 DW |
170 | |
171 | return ret; | |
172 | } | |
173 | ||
8728fe50 | 174 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
175 | { |
176 | int ret; | |
177 | struct trace_entry ent; | |
178 | ||
179 | __common_field(unsigned short, type); | |
180 | __common_field(unsigned char, flags); | |
181 | __common_field(unsigned char, preempt_count); | |
182 | __common_field(int, pid); | |
e647d6b3 LZ |
183 | |
184 | return ret; | |
185 | } | |
186 | ||
2425bcb9 | 187 | static void trace_destroy_fields(struct trace_event_call *call) |
2df75e41 LZ |
188 | { |
189 | struct ftrace_event_field *field, *next; | |
2e33af02 | 190 | struct list_head *head; |
2df75e41 | 191 | |
2e33af02 SR |
192 | head = trace_get_fields(call); |
193 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 194 | list_del(&field->link); |
d1a29143 | 195 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
196 | } |
197 | } | |
198 | ||
32bbe007 AS |
199 | /* |
200 | * run-time version of trace_event_get_offsets_<call>() that returns the last | |
201 | * accessible offset of trace fields excluding __dynamic_array bytes | |
202 | */ | |
203 | int trace_event_get_offsets(struct trace_event_call *call) | |
204 | { | |
205 | struct ftrace_event_field *tail; | |
206 | struct list_head *head; | |
207 | ||
208 | head = trace_get_fields(call); | |
209 | /* | |
210 | * head->next points to the last field with the largest offset, | |
211 | * since it was added last by trace_define_field() | |
212 | */ | |
213 | tail = list_first_entry(head, struct ftrace_event_field, link); | |
214 | return tail->offset + tail->size; | |
215 | } | |
216 | ||
2425bcb9 | 217 | int trace_event_raw_init(struct trace_event_call *call) |
87d9b4e1 LZ |
218 | { |
219 | int id; | |
220 | ||
9023c930 | 221 | id = register_trace_event(&call->event); |
87d9b4e1 LZ |
222 | if (!id) |
223 | return -ENODEV; | |
87d9b4e1 LZ |
224 | |
225 | return 0; | |
226 | } | |
227 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
228 | ||
3fdaf80f SRRH |
229 | bool trace_event_ignore_this_pid(struct trace_event_file *trace_file) |
230 | { | |
231 | struct trace_array *tr = trace_file->tr; | |
232 | struct trace_array_cpu *data; | |
233 | struct trace_pid_list *pid_list; | |
234 | ||
da25a672 | 235 | pid_list = rcu_dereference_raw(tr->filtered_pids); |
3fdaf80f SRRH |
236 | if (!pid_list) |
237 | return false; | |
238 | ||
239 | data = this_cpu_ptr(tr->trace_buffer.data); | |
240 | ||
241 | return data->ignore_pid; | |
242 | } | |
243 | EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid); | |
244 | ||
3f795dcf SRRH |
245 | void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, |
246 | struct trace_event_file *trace_file, | |
247 | unsigned long len) | |
3fd40d1e | 248 | { |
2425bcb9 | 249 | struct trace_event_call *event_call = trace_file->event_call; |
3fd40d1e | 250 | |
3fdaf80f SRRH |
251 | if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) && |
252 | trace_event_ignore_this_pid(trace_file)) | |
253 | return NULL; | |
254 | ||
3fd40d1e SR |
255 | local_save_flags(fbuffer->flags); |
256 | fbuffer->pc = preempt_count(); | |
e947841c | 257 | /* |
30c93704 | 258 | * If CONFIG_PREEMPTION is enabled, then the tracepoint itself disables |
e947841c SRRH |
259 | * preemption (adding one to the preempt_count). Since we are |
260 | * interested in the preempt_count at the time the tracepoint was | |
261 | * hit, we need to subtract one to offset the increment. | |
262 | */ | |
30c93704 | 263 | if (IS_ENABLED(CONFIG_PREEMPTION)) |
e947841c | 264 | fbuffer->pc--; |
7f1d2f82 | 265 | fbuffer->trace_file = trace_file; |
3fd40d1e SR |
266 | |
267 | fbuffer->event = | |
7f1d2f82 | 268 | trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, |
3fd40d1e SR |
269 | event_call->event.type, len, |
270 | fbuffer->flags, fbuffer->pc); | |
271 | if (!fbuffer->event) | |
272 | return NULL; | |
273 | ||
274 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); | |
275 | return fbuffer->entry; | |
276 | } | |
3f795dcf | 277 | EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); |
3fd40d1e | 278 | |
2425bcb9 | 279 | int trace_event_reg(struct trace_event_call *call, |
9023c930 | 280 | enum trace_reg type, void *data) |
a1d0ce82 | 281 | { |
7f1d2f82 | 282 | struct trace_event_file *file = data; |
ae63b31e | 283 | |
de7b2973 | 284 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
a1d0ce82 SR |
285 | switch (type) { |
286 | case TRACE_REG_REGISTER: | |
de7b2973 | 287 | return tracepoint_probe_register(call->tp, |
a1d0ce82 | 288 | call->class->probe, |
ae63b31e | 289 | file); |
a1d0ce82 | 290 | case TRACE_REG_UNREGISTER: |
de7b2973 | 291 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 | 292 | call->class->probe, |
ae63b31e | 293 | file); |
a1d0ce82 SR |
294 | return 0; |
295 | ||
296 | #ifdef CONFIG_PERF_EVENTS | |
297 | case TRACE_REG_PERF_REGISTER: | |
de7b2973 | 298 | return tracepoint_probe_register(call->tp, |
a1d0ce82 SR |
299 | call->class->perf_probe, |
300 | call); | |
301 | case TRACE_REG_PERF_UNREGISTER: | |
de7b2973 | 302 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 SR |
303 | call->class->perf_probe, |
304 | call); | |
305 | return 0; | |
ceec0b6f JO |
306 | case TRACE_REG_PERF_OPEN: |
307 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
308 | case TRACE_REG_PERF_ADD: |
309 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 310 | return 0; |
a1d0ce82 SR |
311 | #endif |
312 | } | |
313 | return 0; | |
314 | } | |
9023c930 | 315 | EXPORT_SYMBOL_GPL(trace_event_reg); |
a1d0ce82 | 316 | |
e870e9a1 LZ |
317 | void trace_event_enable_cmd_record(bool enable) |
318 | { | |
7f1d2f82 | 319 | struct trace_event_file *file; |
ae63b31e | 320 | struct trace_array *tr; |
e870e9a1 LZ |
321 | |
322 | mutex_lock(&event_mutex); | |
ae63b31e SR |
323 | do_for_each_event_file(tr, file) { |
324 | ||
5d6ad960 | 325 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) |
e870e9a1 LZ |
326 | continue; |
327 | ||
328 | if (enable) { | |
329 | tracing_start_cmdline_record(); | |
5d6ad960 | 330 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
331 | } else { |
332 | tracing_stop_cmdline_record(); | |
5d6ad960 | 333 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 334 | } |
ae63b31e | 335 | } while_for_each_event_file(); |
e870e9a1 LZ |
336 | mutex_unlock(&event_mutex); |
337 | } | |
338 | ||
d914ba37 JF |
339 | void trace_event_enable_tgid_record(bool enable) |
340 | { | |
341 | struct trace_event_file *file; | |
342 | struct trace_array *tr; | |
343 | ||
344 | mutex_lock(&event_mutex); | |
345 | do_for_each_event_file(tr, file) { | |
346 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) | |
347 | continue; | |
348 | ||
349 | if (enable) { | |
350 | tracing_start_tgid_record(); | |
351 | set_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); | |
352 | } else { | |
353 | tracing_stop_tgid_record(); | |
354 | clear_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, | |
355 | &file->flags); | |
356 | } | |
357 | } while_for_each_event_file(); | |
358 | mutex_unlock(&event_mutex); | |
359 | } | |
360 | ||
7f1d2f82 | 361 | static int __ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 | 362 | int enable, int soft_disable) |
fd994989 | 363 | { |
2425bcb9 | 364 | struct trace_event_call *call = file->event_call; |
983f938a | 365 | struct trace_array *tr = file->tr; |
0fc1b09f | 366 | unsigned long file_flags = file->flags; |
3b8e4273 | 367 | int ret = 0; |
417944c4 | 368 | int disable; |
3b8e4273 | 369 | |
fd994989 SR |
370 | switch (enable) { |
371 | case 0: | |
417944c4 | 372 | /* |
1cf4c073 MH |
373 | * When soft_disable is set and enable is cleared, the sm_ref |
374 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
375 | * to clear the SOFT_DISABLED flag but leave the event in the |
376 | * state that it was. That is, if the event was enabled and | |
377 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
378 | * is set we do not want the event to be enabled before we | |
379 | * clear the bit. | |
380 | * | |
381 | * When soft_disable is not set but the SOFT_MODE flag is, | |
382 | * we do nothing. Do not disable the tracepoint, otherwise | |
383 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
384 | */ | |
385 | if (soft_disable) { | |
1cf4c073 MH |
386 | if (atomic_dec_return(&file->sm_ref) > 0) |
387 | break; | |
5d6ad960 SRRH |
388 | disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; |
389 | clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); | |
417944c4 | 390 | } else |
5d6ad960 | 391 | disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); |
417944c4 | 392 | |
5d6ad960 SRRH |
393 | if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { |
394 | clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); | |
395 | if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { | |
e870e9a1 | 396 | tracing_stop_cmdline_record(); |
5d6ad960 | 397 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 398 | } |
d914ba37 JF |
399 | |
400 | if (file->flags & EVENT_FILE_FL_RECORDED_TGID) { | |
401 | tracing_stop_tgid_record(); | |
7685ab6c | 402 | clear_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); |
d914ba37 JF |
403 | } |
404 | ||
ae63b31e | 405 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 406 | } |
3baa5e4c | 407 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
5d6ad960 SRRH |
408 | if (file->flags & EVENT_FILE_FL_SOFT_MODE) |
409 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c | 410 | else |
5d6ad960 | 411 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
fd994989 SR |
412 | break; |
413 | case 1: | |
417944c4 SRRH |
414 | /* |
415 | * When soft_disable is set and enable is set, we want to | |
416 | * register the tracepoint for the event, but leave the event | |
417 | * as is. That means, if the event was already enabled, we do | |
418 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
419 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
420 | * it still seems to be disabled. | |
421 | */ | |
422 | if (!soft_disable) | |
5d6ad960 | 423 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
1cf4c073 MH |
424 | else { |
425 | if (atomic_inc_return(&file->sm_ref) > 1) | |
426 | break; | |
5d6ad960 | 427 | set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 428 | } |
417944c4 | 429 | |
5d6ad960 | 430 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) { |
d914ba37 | 431 | bool cmd = false, tgid = false; |
417944c4 SRRH |
432 | |
433 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
434 | if (soft_disable) | |
5d6ad960 | 435 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
417944c4 | 436 | |
983f938a | 437 | if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { |
d914ba37 | 438 | cmd = true; |
e870e9a1 | 439 | tracing_start_cmdline_record(); |
5d6ad960 | 440 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 441 | } |
d914ba37 JF |
442 | |
443 | if (tr->trace_flags & TRACE_ITER_RECORD_TGID) { | |
444 | tgid = true; | |
445 | tracing_start_tgid_record(); | |
446 | set_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); | |
447 | } | |
448 | ||
ae63b31e | 449 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 | 450 | if (ret) { |
d914ba37 JF |
451 | if (cmd) |
452 | tracing_stop_cmdline_record(); | |
453 | if (tgid) | |
454 | tracing_stop_tgid_record(); | |
3b8e4273 | 455 | pr_info("event trace: Could not enable event " |
687fcc4a | 456 | "%s\n", trace_event_name(call)); |
3b8e4273 LZ |
457 | break; |
458 | } | |
5d6ad960 | 459 | set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
460 | |
461 | /* WAS_ENABLED gets set but never cleared. */ | |
065e63f9 | 462 | set_bit(EVENT_FILE_FL_WAS_ENABLED_BIT, &file->flags); |
fd994989 | 463 | } |
fd994989 SR |
464 | break; |
465 | } | |
3b8e4273 | 466 | |
0fc1b09f SRRH |
467 | /* Enable or disable use of trace_buffered_event */ |
468 | if ((file_flags & EVENT_FILE_FL_SOFT_DISABLED) != | |
469 | (file->flags & EVENT_FILE_FL_SOFT_DISABLED)) { | |
470 | if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) | |
471 | trace_buffered_event_enable(); | |
472 | else | |
473 | trace_buffered_event_disable(); | |
474 | } | |
475 | ||
3b8e4273 | 476 | return ret; |
fd994989 SR |
477 | } |
478 | ||
7f1d2f82 | 479 | int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 TZ |
480 | int enable, int soft_disable) |
481 | { | |
482 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
483 | } | |
484 | ||
7f1d2f82 | 485 | static int ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 SRRH |
486 | int enable) |
487 | { | |
488 | return __ftrace_event_enable_disable(file, enable, 0); | |
489 | } | |
490 | ||
ae63b31e | 491 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 492 | { |
7f1d2f82 | 493 | struct trace_event_file *file; |
0e907c99 Z |
494 | |
495 | mutex_lock(&event_mutex); | |
ae63b31e SR |
496 | list_for_each_entry(file, &tr->events, list) { |
497 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
498 | } |
499 | mutex_unlock(&event_mutex); | |
500 | } | |
501 | ||
c37775d5 SR |
502 | static void |
503 | event_filter_pid_sched_process_exit(void *data, struct task_struct *task) | |
504 | { | |
505 | struct trace_pid_list *pid_list; | |
506 | struct trace_array *tr = data; | |
507 | ||
da25a672 | 508 | pid_list = rcu_dereference_raw(tr->filtered_pids); |
4e267db1 | 509 | trace_filter_add_remove_task(pid_list, NULL, task); |
c37775d5 SR |
510 | } |
511 | ||
512 | static void | |
513 | event_filter_pid_sched_process_fork(void *data, | |
514 | struct task_struct *self, | |
515 | struct task_struct *task) | |
516 | { | |
517 | struct trace_pid_list *pid_list; | |
518 | struct trace_array *tr = data; | |
519 | ||
520 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
4e267db1 | 521 | trace_filter_add_remove_task(pid_list, self, task); |
c37775d5 SR |
522 | } |
523 | ||
524 | void trace_event_follow_fork(struct trace_array *tr, bool enable) | |
525 | { | |
526 | if (enable) { | |
527 | register_trace_prio_sched_process_fork(event_filter_pid_sched_process_fork, | |
528 | tr, INT_MIN); | |
529 | register_trace_prio_sched_process_exit(event_filter_pid_sched_process_exit, | |
530 | tr, INT_MAX); | |
531 | } else { | |
532 | unregister_trace_sched_process_fork(event_filter_pid_sched_process_fork, | |
533 | tr); | |
534 | unregister_trace_sched_process_exit(event_filter_pid_sched_process_exit, | |
535 | tr); | |
536 | } | |
3fdaf80f SRRH |
537 | } |
538 | ||
539 | static void | |
22402cd0 | 540 | event_filter_pid_sched_switch_probe_pre(void *data, bool preempt, |
3fdaf80f SRRH |
541 | struct task_struct *prev, struct task_struct *next) |
542 | { | |
543 | struct trace_array *tr = data; | |
544 | struct trace_pid_list *pid_list; | |
545 | ||
546 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
547 | ||
548 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 SR |
549 | trace_ignore_this_task(pid_list, prev) && |
550 | trace_ignore_this_task(pid_list, next)); | |
3fdaf80f SRRH |
551 | } |
552 | ||
553 | static void | |
22402cd0 | 554 | event_filter_pid_sched_switch_probe_post(void *data, bool preempt, |
3fdaf80f SRRH |
555 | struct task_struct *prev, struct task_struct *next) |
556 | { | |
557 | struct trace_array *tr = data; | |
558 | struct trace_pid_list *pid_list; | |
559 | ||
560 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
561 | ||
562 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 563 | trace_ignore_this_task(pid_list, next)); |
3fdaf80f SRRH |
564 | } |
565 | ||
566 | static void | |
567 | event_filter_pid_sched_wakeup_probe_pre(void *data, struct task_struct *task) | |
568 | { | |
569 | struct trace_array *tr = data; | |
570 | struct trace_pid_list *pid_list; | |
571 | ||
572 | /* Nothing to do if we are already tracing */ | |
573 | if (!this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
574 | return; | |
575 | ||
576 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
577 | ||
578 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 579 | trace_ignore_this_task(pid_list, task)); |
3fdaf80f SRRH |
580 | } |
581 | ||
582 | static void | |
583 | event_filter_pid_sched_wakeup_probe_post(void *data, struct task_struct *task) | |
584 | { | |
585 | struct trace_array *tr = data; | |
586 | struct trace_pid_list *pid_list; | |
587 | ||
588 | /* Nothing to do if we are not tracing */ | |
589 | if (this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
590 | return; | |
591 | ||
592 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
593 | ||
594 | /* Set tracing if current is enabled */ | |
595 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 596 | trace_ignore_this_task(pid_list, current)); |
3fdaf80f SRRH |
597 | } |
598 | ||
49090107 SRRH |
599 | static void __ftrace_clear_event_pids(struct trace_array *tr) |
600 | { | |
601 | struct trace_pid_list *pid_list; | |
3fdaf80f SRRH |
602 | struct trace_event_file *file; |
603 | int cpu; | |
49090107 SRRH |
604 | |
605 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
606 | lockdep_is_held(&event_mutex)); | |
607 | if (!pid_list) | |
608 | return; | |
609 | ||
3fdaf80f SRRH |
610 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_pre, tr); |
611 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_post, tr); | |
612 | ||
613 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, tr); | |
614 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, tr); | |
615 | ||
0f72e37e SRRH |
616 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, tr); |
617 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, tr); | |
618 | ||
619 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_pre, tr); | |
620 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_post, tr); | |
621 | ||
3fdaf80f SRRH |
622 | list_for_each_entry(file, &tr->events, list) { |
623 | clear_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
624 | } | |
625 | ||
626 | for_each_possible_cpu(cpu) | |
627 | per_cpu_ptr(tr->trace_buffer.data, cpu)->ignore_pid = false; | |
628 | ||
49090107 SRRH |
629 | rcu_assign_pointer(tr->filtered_pids, NULL); |
630 | ||
631 | /* Wait till all users are no longer using pid filtering */ | |
e0a568dc | 632 | tracepoint_synchronize_unregister(); |
49090107 | 633 | |
76c813e2 | 634 | trace_free_pid_list(pid_list); |
49090107 SRRH |
635 | } |
636 | ||
637 | static void ftrace_clear_event_pids(struct trace_array *tr) | |
638 | { | |
639 | mutex_lock(&event_mutex); | |
640 | __ftrace_clear_event_pids(tr); | |
641 | mutex_unlock(&event_mutex); | |
642 | } | |
643 | ||
e9dbfae5 SR |
644 | static void __put_system(struct event_subsystem *system) |
645 | { | |
646 | struct event_filter *filter = system->filter; | |
647 | ||
6e94a780 SR |
648 | WARN_ON_ONCE(system_refcount(system) == 0); |
649 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
650 | return; |
651 | ||
ae63b31e SR |
652 | list_del(&system->list); |
653 | ||
e9dbfae5 SR |
654 | if (filter) { |
655 | kfree(filter->filter_string); | |
656 | kfree(filter); | |
657 | } | |
79ac6ef5 | 658 | kfree_const(system->name); |
e9dbfae5 SR |
659 | kfree(system); |
660 | } | |
661 | ||
662 | static void __get_system(struct event_subsystem *system) | |
663 | { | |
6e94a780 SR |
664 | WARN_ON_ONCE(system_refcount(system) == 0); |
665 | system_refcount_inc(system); | |
e9dbfae5 SR |
666 | } |
667 | ||
7967b3e0 | 668 | static void __get_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
669 | { |
670 | WARN_ON_ONCE(dir->ref_count == 0); | |
671 | dir->ref_count++; | |
672 | __get_system(dir->subsystem); | |
673 | } | |
674 | ||
7967b3e0 | 675 | static void __put_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
676 | { |
677 | WARN_ON_ONCE(dir->ref_count == 0); | |
678 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 679 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
680 | |
681 | __put_system(dir->subsystem); | |
682 | if (!--dir->ref_count) | |
683 | kfree(dir); | |
684 | } | |
685 | ||
7967b3e0 | 686 | static void put_system(struct trace_subsystem_dir *dir) |
e9dbfae5 SR |
687 | { |
688 | mutex_lock(&event_mutex); | |
ae63b31e | 689 | __put_system_dir(dir); |
e9dbfae5 SR |
690 | mutex_unlock(&event_mutex); |
691 | } | |
692 | ||
7967b3e0 | 693 | static void remove_subsystem(struct trace_subsystem_dir *dir) |
f6a84bdc ON |
694 | { |
695 | if (!dir) | |
696 | return; | |
697 | ||
698 | if (!--dir->nr_events) { | |
8434dc93 | 699 | tracefs_remove_recursive(dir->entry); |
f6a84bdc ON |
700 | list_del(&dir->list); |
701 | __put_system_dir(dir); | |
702 | } | |
703 | } | |
704 | ||
7f1d2f82 | 705 | static void remove_event_file_dir(struct trace_event_file *file) |
f6a84bdc | 706 | { |
bf682c31 ON |
707 | struct dentry *dir = file->dir; |
708 | struct dentry *child; | |
709 | ||
710 | if (dir) { | |
711 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
946e51f2 | 712 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
7682c918 DH |
713 | if (d_really_is_positive(child)) /* probably unneeded */ |
714 | d_inode(child)->i_private = NULL; | |
bf682c31 ON |
715 | } |
716 | spin_unlock(&dir->d_lock); | |
717 | ||
8434dc93 | 718 | tracefs_remove_recursive(dir); |
bf682c31 ON |
719 | } |
720 | ||
f6a84bdc | 721 | list_del(&file->list); |
f6a84bdc | 722 | remove_subsystem(file->system); |
2448e349 | 723 | free_event_filter(file->filter); |
f6a84bdc ON |
724 | kmem_cache_free(file_cachep, file); |
725 | } | |
726 | ||
8f31bfe5 LZ |
727 | /* |
728 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
729 | */ | |
2a6c24af SRRH |
730 | static int |
731 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
732 | const char *sub, const char *event, int set) | |
b77e38aa | 733 | { |
7f1d2f82 | 734 | struct trace_event_file *file; |
2425bcb9 | 735 | struct trace_event_call *call; |
de7b2973 | 736 | const char *name; |
29f93943 | 737 | int ret = -EINVAL; |
989a0a3d | 738 | int eret = 0; |
8f31bfe5 | 739 | |
ae63b31e SR |
740 | list_for_each_entry(file, &tr->events, list) { |
741 | ||
742 | call = file->event_call; | |
687fcc4a | 743 | name = trace_event_name(call); |
8f31bfe5 | 744 | |
de7b2973 | 745 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
746 | continue; |
747 | ||
9b63776f SR |
748 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
749 | continue; | |
750 | ||
8f31bfe5 | 751 | if (match && |
de7b2973 | 752 | strcmp(match, name) != 0 && |
8f082018 | 753 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
754 | continue; |
755 | ||
8f082018 | 756 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
757 | continue; |
758 | ||
de7b2973 | 759 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
760 | continue; |
761 | ||
989a0a3d | 762 | ret = ftrace_event_enable_disable(file, set); |
8f31bfe5 | 763 | |
989a0a3d SRRH |
764 | /* |
765 | * Save the first error and return that. Some events | |
766 | * may still have been enabled, but let the user | |
767 | * know that something went wrong. | |
768 | */ | |
769 | if (ret && !eret) | |
770 | eret = ret; | |
771 | ||
772 | ret = eret; | |
8f31bfe5 | 773 | } |
2a6c24af SRRH |
774 | |
775 | return ret; | |
776 | } | |
777 | ||
778 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
779 | const char *sub, const char *event, int set) | |
780 | { | |
781 | int ret; | |
782 | ||
783 | mutex_lock(&event_mutex); | |
784 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
785 | mutex_unlock(&event_mutex); |
786 | ||
787 | return ret; | |
788 | } | |
789 | ||
595a438c | 790 | int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 791 | { |
b628b3e6 | 792 | char *event = NULL, *sub = NULL, *match; |
84fce9db | 793 | int ret; |
b628b3e6 SR |
794 | |
795 | /* | |
796 | * The buf format can be <subsystem>:<event-name> | |
797 | * *:<event-name> means any event by that name. | |
798 | * :<event-name> is the same. | |
799 | * | |
800 | * <subsystem>:* means all events in that subsystem | |
801 | * <subsystem>: means the same. | |
802 | * | |
803 | * <name> (no ':') means all events in a subsystem with | |
804 | * the name <name> or any event that matches <name> | |
805 | */ | |
806 | ||
807 | match = strsep(&buf, ":"); | |
808 | if (buf) { | |
809 | sub = match; | |
810 | event = buf; | |
811 | match = NULL; | |
812 | ||
813 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
814 | sub = NULL; | |
815 | if (!strlen(event) || strcmp(event, "*") == 0) | |
816 | event = NULL; | |
817 | } | |
b77e38aa | 818 | |
84fce9db JK |
819 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
820 | ||
821 | /* Put back the colon to allow this to be called again */ | |
822 | if (buf) | |
823 | *(buf - 1) = ':'; | |
824 | ||
825 | return ret; | |
b77e38aa | 826 | } |
f45d1225 | 827 | EXPORT_SYMBOL_GPL(ftrace_set_clr_event); |
b77e38aa | 828 | |
4671c794 SR |
829 | /** |
830 | * trace_set_clr_event - enable or disable an event | |
831 | * @system: system name to match (NULL for any system) | |
832 | * @event: event name to match (NULL for all events, within system) | |
833 | * @set: 1 to enable, 0 to disable | |
834 | * | |
835 | * This is a way for other parts of the kernel to enable or disable | |
836 | * event recording. | |
837 | * | |
838 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
839 | * registered events. | |
840 | */ | |
841 | int trace_set_clr_event(const char *system, const char *event, int set) | |
842 | { | |
ae63b31e SR |
843 | struct trace_array *tr = top_trace_array(); |
844 | ||
dc81e5e3 YY |
845 | if (!tr) |
846 | return -ENODEV; | |
847 | ||
ae63b31e | 848 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 849 | } |
56355b83 | 850 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 851 | |
b77e38aa SR |
852 | /* 128 should be much more than enough */ |
853 | #define EVENT_BUF_SIZE 127 | |
854 | ||
855 | static ssize_t | |
856 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
857 | size_t cnt, loff_t *ppos) | |
858 | { | |
48966364 | 859 | struct trace_parser parser; |
ae63b31e SR |
860 | struct seq_file *m = file->private_data; |
861 | struct trace_array *tr = m->private; | |
4ba7978e | 862 | ssize_t read, ret; |
b77e38aa | 863 | |
4ba7978e | 864 | if (!cnt) |
b77e38aa SR |
865 | return 0; |
866 | ||
1852fcce SR |
867 | ret = tracing_update_buffers(); |
868 | if (ret < 0) | |
869 | return ret; | |
870 | ||
48966364 | 871 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
872 | return -ENOMEM; |
873 | ||
48966364 | 874 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
875 | ||
4ba7978e | 876 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 877 | int set = 1; |
b77e38aa | 878 | |
48966364 | 879 | if (*parser.buffer == '!') |
b77e38aa | 880 | set = 0; |
b77e38aa | 881 | |
ae63b31e | 882 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 883 | if (ret) |
48966364 | 884 | goto out_put; |
b77e38aa | 885 | } |
b77e38aa SR |
886 | |
887 | ret = read; | |
888 | ||
48966364 | 889 | out_put: |
890 | trace_parser_put(&parser); | |
b77e38aa SR |
891 | |
892 | return ret; | |
893 | } | |
894 | ||
895 | static void * | |
896 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
897 | { | |
7f1d2f82 | 898 | struct trace_event_file *file = v; |
2425bcb9 | 899 | struct trace_event_call *call; |
ae63b31e | 900 | struct trace_array *tr = m->private; |
b77e38aa SR |
901 | |
902 | (*pos)++; | |
903 | ||
ae63b31e SR |
904 | list_for_each_entry_continue(file, &tr->events, list) { |
905 | call = file->event_call; | |
40e26815 SR |
906 | /* |
907 | * The ftrace subsystem is for showing formats only. | |
908 | * They can not be enabled or disabled via the event files. | |
909 | */ | |
d045437a SRRH |
910 | if (call->class && call->class->reg && |
911 | !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
ae63b31e | 912 | return file; |
40e26815 | 913 | } |
b77e38aa | 914 | |
30bd39cd | 915 | return NULL; |
b77e38aa SR |
916 | } |
917 | ||
918 | static void *t_start(struct seq_file *m, loff_t *pos) | |
919 | { | |
7f1d2f82 | 920 | struct trace_event_file *file; |
ae63b31e | 921 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
922 | loff_t l; |
923 | ||
20c8928a | 924 | mutex_lock(&event_mutex); |
e1c7e2a6 | 925 | |
7f1d2f82 | 926 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 927 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
928 | file = t_next(m, file, &l); |
929 | if (!file) | |
e1c7e2a6 LZ |
930 | break; |
931 | } | |
ae63b31e | 932 | return file; |
b77e38aa SR |
933 | } |
934 | ||
935 | static void * | |
936 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
937 | { | |
7f1d2f82 | 938 | struct trace_event_file *file = v; |
ae63b31e | 939 | struct trace_array *tr = m->private; |
b77e38aa SR |
940 | |
941 | (*pos)++; | |
942 | ||
ae63b31e | 943 | list_for_each_entry_continue(file, &tr->events, list) { |
5d6ad960 | 944 | if (file->flags & EVENT_FILE_FL_ENABLED) |
ae63b31e | 945 | return file; |
b77e38aa SR |
946 | } |
947 | ||
30bd39cd | 948 | return NULL; |
b77e38aa SR |
949 | } |
950 | ||
951 | static void *s_start(struct seq_file *m, loff_t *pos) | |
952 | { | |
7f1d2f82 | 953 | struct trace_event_file *file; |
ae63b31e | 954 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
955 | loff_t l; |
956 | ||
20c8928a | 957 | mutex_lock(&event_mutex); |
e1c7e2a6 | 958 | |
7f1d2f82 | 959 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 960 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
961 | file = s_next(m, file, &l); |
962 | if (!file) | |
e1c7e2a6 LZ |
963 | break; |
964 | } | |
ae63b31e | 965 | return file; |
b77e38aa SR |
966 | } |
967 | ||
968 | static int t_show(struct seq_file *m, void *v) | |
969 | { | |
7f1d2f82 | 970 | struct trace_event_file *file = v; |
2425bcb9 | 971 | struct trace_event_call *call = file->event_call; |
b77e38aa | 972 | |
8f082018 SR |
973 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
974 | seq_printf(m, "%s:", call->class->system); | |
687fcc4a | 975 | seq_printf(m, "%s\n", trace_event_name(call)); |
b77e38aa SR |
976 | |
977 | return 0; | |
978 | } | |
979 | ||
980 | static void t_stop(struct seq_file *m, void *p) | |
981 | { | |
20c8928a | 982 | mutex_unlock(&event_mutex); |
b77e38aa SR |
983 | } |
984 | ||
f4d34a87 SR |
985 | static void * |
986 | p_next(struct seq_file *m, void *v, loff_t *pos) | |
987 | { | |
988 | struct trace_array *tr = m->private; | |
989 | struct trace_pid_list *pid_list = rcu_dereference_sched(tr->filtered_pids); | |
f4d34a87 | 990 | |
5cc8976b | 991 | return trace_pid_next(pid_list, v, pos); |
f4d34a87 SR |
992 | } |
993 | ||
49090107 | 994 | static void *p_start(struct seq_file *m, loff_t *pos) |
fb662288 | 995 | __acquires(RCU) |
49090107 SRRH |
996 | { |
997 | struct trace_pid_list *pid_list; | |
998 | struct trace_array *tr = m->private; | |
999 | ||
1000 | /* | |
1001 | * Grab the mutex, to keep calls to p_next() having the same | |
1002 | * tr->filtered_pids as p_start() has. | |
1003 | * If we just passed the tr->filtered_pids around, then RCU would | |
1004 | * have been enough, but doing that makes things more complex. | |
1005 | */ | |
1006 | mutex_lock(&event_mutex); | |
1007 | rcu_read_lock_sched(); | |
1008 | ||
1009 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1010 | ||
f4d34a87 | 1011 | if (!pid_list) |
49090107 SRRH |
1012 | return NULL; |
1013 | ||
5cc8976b | 1014 | return trace_pid_start(pid_list, pos); |
49090107 SRRH |
1015 | } |
1016 | ||
1017 | static void p_stop(struct seq_file *m, void *p) | |
fb662288 | 1018 | __releases(RCU) |
49090107 SRRH |
1019 | { |
1020 | rcu_read_unlock_sched(); | |
1021 | mutex_unlock(&event_mutex); | |
1022 | } | |
1023 | ||
1473e441 SR |
1024 | static ssize_t |
1025 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1026 | loff_t *ppos) | |
1027 | { | |
7f1d2f82 | 1028 | struct trace_event_file *file; |
bc6f6b08 | 1029 | unsigned long flags; |
a4390596 TZ |
1030 | char buf[4] = "0"; |
1031 | ||
bc6f6b08 ON |
1032 | mutex_lock(&event_mutex); |
1033 | file = event_file_data(filp); | |
1034 | if (likely(file)) | |
1035 | flags = file->flags; | |
1036 | mutex_unlock(&event_mutex); | |
1037 | ||
1038 | if (!file) | |
1039 | return -ENODEV; | |
1040 | ||
5d6ad960 SRRH |
1041 | if (flags & EVENT_FILE_FL_ENABLED && |
1042 | !(flags & EVENT_FILE_FL_SOFT_DISABLED)) | |
a4390596 TZ |
1043 | strcpy(buf, "1"); |
1044 | ||
5d6ad960 SRRH |
1045 | if (flags & EVENT_FILE_FL_SOFT_DISABLED || |
1046 | flags & EVENT_FILE_FL_SOFT_MODE) | |
a4390596 TZ |
1047 | strcat(buf, "*"); |
1048 | ||
1049 | strcat(buf, "\n"); | |
1473e441 | 1050 | |
417944c4 | 1051 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
1052 | } |
1053 | ||
1054 | static ssize_t | |
1055 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1056 | loff_t *ppos) | |
1057 | { | |
7f1d2f82 | 1058 | struct trace_event_file *file; |
1473e441 SR |
1059 | unsigned long val; |
1060 | int ret; | |
1061 | ||
22fe9b54 PH |
1062 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1063 | if (ret) | |
1473e441 SR |
1064 | return ret; |
1065 | ||
1852fcce SR |
1066 | ret = tracing_update_buffers(); |
1067 | if (ret < 0) | |
1068 | return ret; | |
1069 | ||
1473e441 SR |
1070 | switch (val) { |
1071 | case 0: | |
1473e441 | 1072 | case 1: |
bc6f6b08 | 1073 | ret = -ENODEV; |
11a241a3 | 1074 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
1075 | file = event_file_data(filp); |
1076 | if (likely(file)) | |
1077 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 1078 | mutex_unlock(&event_mutex); |
1473e441 SR |
1079 | break; |
1080 | ||
1081 | default: | |
1082 | return -EINVAL; | |
1083 | } | |
1084 | ||
1085 | *ppos += cnt; | |
1086 | ||
3b8e4273 | 1087 | return ret ? ret : cnt; |
1473e441 SR |
1088 | } |
1089 | ||
8ae79a13 SR |
1090 | static ssize_t |
1091 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1092 | loff_t *ppos) | |
1093 | { | |
c142b15d | 1094 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
7967b3e0 | 1095 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1096 | struct event_subsystem *system = dir->subsystem; |
2425bcb9 | 1097 | struct trace_event_call *call; |
7f1d2f82 | 1098 | struct trace_event_file *file; |
ae63b31e | 1099 | struct trace_array *tr = dir->tr; |
8ae79a13 | 1100 | char buf[2]; |
c142b15d | 1101 | int set = 0; |
8ae79a13 SR |
1102 | int ret; |
1103 | ||
8ae79a13 | 1104 | mutex_lock(&event_mutex); |
ae63b31e SR |
1105 | list_for_each_entry(file, &tr->events, list) { |
1106 | call = file->event_call; | |
687fcc4a | 1107 | if (!trace_event_name(call) || !call->class || !call->class->reg) |
8ae79a13 SR |
1108 | continue; |
1109 | ||
40ee4dff | 1110 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
1111 | continue; |
1112 | ||
1113 | /* | |
1114 | * We need to find out if all the events are set | |
1115 | * or if all events or cleared, or if we have | |
1116 | * a mixture. | |
1117 | */ | |
5d6ad960 | 1118 | set |= (1 << !!(file->flags & EVENT_FILE_FL_ENABLED)); |
c142b15d | 1119 | |
8ae79a13 SR |
1120 | /* |
1121 | * If we have a mixture, no need to look further. | |
1122 | */ | |
c142b15d | 1123 | if (set == 3) |
8ae79a13 SR |
1124 | break; |
1125 | } | |
1126 | mutex_unlock(&event_mutex); | |
1127 | ||
c142b15d | 1128 | buf[0] = set_to_char[set]; |
8ae79a13 | 1129 | buf[1] = '\n'; |
8ae79a13 SR |
1130 | |
1131 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
1132 | ||
1133 | return ret; | |
1134 | } | |
1135 | ||
1136 | static ssize_t | |
1137 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1138 | loff_t *ppos) | |
1139 | { | |
7967b3e0 | 1140 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1141 | struct event_subsystem *system = dir->subsystem; |
40ee4dff | 1142 | const char *name = NULL; |
8ae79a13 | 1143 | unsigned long val; |
8ae79a13 SR |
1144 | ssize_t ret; |
1145 | ||
22fe9b54 PH |
1146 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1147 | if (ret) | |
8ae79a13 SR |
1148 | return ret; |
1149 | ||
1150 | ret = tracing_update_buffers(); | |
1151 | if (ret < 0) | |
1152 | return ret; | |
1153 | ||
8f31bfe5 | 1154 | if (val != 0 && val != 1) |
8ae79a13 | 1155 | return -EINVAL; |
8ae79a13 | 1156 | |
40ee4dff SR |
1157 | /* |
1158 | * Opening of "enable" adds a ref count to system, | |
1159 | * so the name is safe to use. | |
1160 | */ | |
1161 | if (system) | |
1162 | name = system->name; | |
1163 | ||
ae63b31e | 1164 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 1165 | if (ret) |
8f31bfe5 | 1166 | goto out; |
8ae79a13 SR |
1167 | |
1168 | ret = cnt; | |
1169 | ||
8f31bfe5 | 1170 | out: |
8ae79a13 SR |
1171 | *ppos += cnt; |
1172 | ||
1173 | return ret; | |
1174 | } | |
1175 | ||
2a37a3df SR |
1176 | enum { |
1177 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
1178 | FORMAT_FIELD_SEPERATOR = 2, |
1179 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
1180 | }; |
1181 | ||
1182 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 1183 | { |
2425bcb9 | 1184 | struct trace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
1185 | struct list_head *common_head = &ftrace_common_fields; |
1186 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 1187 | struct list_head *node = v; |
981d081e | 1188 | |
2a37a3df | 1189 | (*pos)++; |
5a65e956 | 1190 | |
2a37a3df SR |
1191 | switch ((unsigned long)v) { |
1192 | case FORMAT_HEADER: | |
7710b639 ON |
1193 | node = common_head; |
1194 | break; | |
5a65e956 | 1195 | |
86397dc3 | 1196 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
1197 | node = head; |
1198 | break; | |
5a65e956 | 1199 | |
2a37a3df SR |
1200 | case FORMAT_PRINTFMT: |
1201 | /* all done */ | |
1202 | return NULL; | |
5a65e956 LJ |
1203 | } |
1204 | ||
7710b639 ON |
1205 | node = node->prev; |
1206 | if (node == common_head) | |
86397dc3 | 1207 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 1208 | else if (node == head) |
2a37a3df | 1209 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
1210 | else |
1211 | return node; | |
2a37a3df SR |
1212 | } |
1213 | ||
1214 | static int f_show(struct seq_file *m, void *v) | |
1215 | { | |
2425bcb9 | 1216 | struct trace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
1217 | struct ftrace_event_field *field; |
1218 | const char *array_descriptor; | |
1219 | ||
1220 | switch ((unsigned long)v) { | |
1221 | case FORMAT_HEADER: | |
687fcc4a | 1222 | seq_printf(m, "name: %s\n", trace_event_name(call)); |
2a37a3df | 1223 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 1224 | seq_puts(m, "format:\n"); |
8728fe50 | 1225 | return 0; |
5a65e956 | 1226 | |
86397dc3 LZ |
1227 | case FORMAT_FIELD_SEPERATOR: |
1228 | seq_putc(m, '\n'); | |
1229 | return 0; | |
1230 | ||
2a37a3df SR |
1231 | case FORMAT_PRINTFMT: |
1232 | seq_printf(m, "\nprint fmt: %s\n", | |
1233 | call->print_fmt); | |
1234 | return 0; | |
981d081e | 1235 | } |
8728fe50 | 1236 | |
7710b639 | 1237 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
1238 | /* |
1239 | * Smartly shows the array type(except dynamic array). | |
1240 | * Normal: | |
1241 | * field:TYPE VAR | |
1242 | * If TYPE := TYPE[LEN], it is shown: | |
1243 | * field:TYPE VAR[LEN] | |
1244 | */ | |
1245 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 1246 | |
b6b27355 | 1247 | if (str_has_prefix(field->type, "__data_loc")) |
2a37a3df | 1248 | array_descriptor = NULL; |
8728fe50 | 1249 | |
2a37a3df SR |
1250 | if (!array_descriptor) |
1251 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1252 | field->type, field->name, field->offset, | |
1253 | field->size, !!field->is_signed); | |
1254 | else | |
1255 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1256 | (int)(array_descriptor - field->type), | |
1257 | field->type, field->name, | |
1258 | array_descriptor, field->offset, | |
1259 | field->size, !!field->is_signed); | |
8728fe50 | 1260 | |
2a37a3df SR |
1261 | return 0; |
1262 | } | |
5a65e956 | 1263 | |
7710b639 ON |
1264 | static void *f_start(struct seq_file *m, loff_t *pos) |
1265 | { | |
1266 | void *p = (void *)FORMAT_HEADER; | |
1267 | loff_t l = 0; | |
1268 | ||
c5a44a12 ON |
1269 | /* ->stop() is called even if ->start() fails */ |
1270 | mutex_lock(&event_mutex); | |
1271 | if (!event_file_data(m->private)) | |
1272 | return ERR_PTR(-ENODEV); | |
1273 | ||
7710b639 ON |
1274 | while (l < *pos && p) |
1275 | p = f_next(m, p, &l); | |
1276 | ||
1277 | return p; | |
1278 | } | |
1279 | ||
2a37a3df SR |
1280 | static void f_stop(struct seq_file *m, void *p) |
1281 | { | |
c5a44a12 | 1282 | mutex_unlock(&event_mutex); |
2a37a3df | 1283 | } |
981d081e | 1284 | |
2a37a3df SR |
1285 | static const struct seq_operations trace_format_seq_ops = { |
1286 | .start = f_start, | |
1287 | .next = f_next, | |
1288 | .stop = f_stop, | |
1289 | .show = f_show, | |
1290 | }; | |
1291 | ||
1292 | static int trace_format_open(struct inode *inode, struct file *file) | |
1293 | { | |
2a37a3df SR |
1294 | struct seq_file *m; |
1295 | int ret; | |
1296 | ||
1297 | ret = seq_open(file, &trace_format_seq_ops); | |
1298 | if (ret < 0) | |
1299 | return ret; | |
1300 | ||
1301 | m = file->private_data; | |
c5a44a12 | 1302 | m->private = file; |
2a37a3df SR |
1303 | |
1304 | return 0; | |
981d081e SR |
1305 | } |
1306 | ||
23725aee PZ |
1307 | static ssize_t |
1308 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1309 | { | |
1a11126b | 1310 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1311 | char buf[32]; |
1312 | int len; | |
23725aee | 1313 | |
1a11126b ON |
1314 | if (unlikely(!id)) |
1315 | return -ENODEV; | |
1316 | ||
1317 | len = sprintf(buf, "%d\n", id); | |
1318 | ||
cd458ba9 | 1319 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1320 | } |
1321 | ||
7ce7e424 TZ |
1322 | static ssize_t |
1323 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1324 | loff_t *ppos) | |
1325 | { | |
7f1d2f82 | 1326 | struct trace_event_file *file; |
7ce7e424 | 1327 | struct trace_seq *s; |
e2912b09 | 1328 | int r = -ENODEV; |
7ce7e424 TZ |
1329 | |
1330 | if (*ppos) | |
1331 | return 0; | |
1332 | ||
1333 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1334 | |
7ce7e424 TZ |
1335 | if (!s) |
1336 | return -ENOMEM; | |
1337 | ||
1338 | trace_seq_init(s); | |
1339 | ||
e2912b09 | 1340 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1341 | file = event_file_data(filp); |
1342 | if (file) | |
1343 | print_event_filter(file, s); | |
e2912b09 ON |
1344 | mutex_unlock(&event_mutex); |
1345 | ||
f306cc82 | 1346 | if (file) |
5ac48378 SRRH |
1347 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1348 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1349 | |
1350 | kfree(s); | |
1351 | ||
1352 | return r; | |
1353 | } | |
1354 | ||
1355 | static ssize_t | |
1356 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1357 | loff_t *ppos) | |
1358 | { | |
7f1d2f82 | 1359 | struct trace_event_file *file; |
8b372562 | 1360 | char *buf; |
e2912b09 | 1361 | int err = -ENODEV; |
7ce7e424 | 1362 | |
8b372562 | 1363 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1364 | return -EINVAL; |
1365 | ||
70f6cbb6 AV |
1366 | buf = memdup_user_nul(ubuf, cnt); |
1367 | if (IS_ERR(buf)) | |
1368 | return PTR_ERR(buf); | |
7ce7e424 | 1369 | |
e2912b09 | 1370 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1371 | file = event_file_data(filp); |
1372 | if (file) | |
1373 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1374 | mutex_unlock(&event_mutex); |
1375 | ||
70f6cbb6 | 1376 | kfree(buf); |
8b372562 | 1377 | if (err < 0) |
44e9c8b7 | 1378 | return err; |
0a19e53c | 1379 | |
7ce7e424 TZ |
1380 | *ppos += cnt; |
1381 | ||
1382 | return cnt; | |
1383 | } | |
1384 | ||
e9dbfae5 SR |
1385 | static LIST_HEAD(event_subsystems); |
1386 | ||
1387 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1388 | { | |
1389 | struct event_subsystem *system = NULL; | |
7967b3e0 | 1390 | struct trace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
ae63b31e | 1391 | struct trace_array *tr; |
e9dbfae5 SR |
1392 | int ret; |
1393 | ||
d6d3523c GB |
1394 | if (tracing_is_disabled()) |
1395 | return -ENODEV; | |
1396 | ||
e9dbfae5 SR |
1397 | /* Make sure the system still exists */ |
1398 | mutex_lock(&event_mutex); | |
12ecef0c | 1399 | mutex_lock(&trace_types_lock); |
ae63b31e SR |
1400 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1401 | list_for_each_entry(dir, &tr->systems, list) { | |
1402 | if (dir == inode->i_private) { | |
1403 | /* Don't open systems with no events */ | |
1404 | if (dir->nr_events) { | |
1405 | __get_system_dir(dir); | |
1406 | system = dir->subsystem; | |
1407 | } | |
1408 | goto exit_loop; | |
e9dbfae5 | 1409 | } |
e9dbfae5 SR |
1410 | } |
1411 | } | |
ae63b31e | 1412 | exit_loop: |
a8227415 | 1413 | mutex_unlock(&trace_types_lock); |
12ecef0c | 1414 | mutex_unlock(&event_mutex); |
e9dbfae5 | 1415 | |
ae63b31e | 1416 | if (!system) |
e9dbfae5 SR |
1417 | return -ENODEV; |
1418 | ||
ae63b31e SR |
1419 | /* Some versions of gcc think dir can be uninitialized here */ |
1420 | WARN_ON(!dir); | |
1421 | ||
8e2e2fa4 SRRH |
1422 | /* Still need to increment the ref count of the system */ |
1423 | if (trace_array_get(tr) < 0) { | |
1424 | put_system(dir); | |
1425 | return -ENODEV; | |
1426 | } | |
1427 | ||
e9dbfae5 | 1428 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1429 | if (ret < 0) { |
1430 | trace_array_put(tr); | |
ae63b31e | 1431 | put_system(dir); |
8e2e2fa4 | 1432 | } |
ae63b31e SR |
1433 | |
1434 | return ret; | |
1435 | } | |
1436 | ||
1437 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1438 | { | |
7967b3e0 | 1439 | struct trace_subsystem_dir *dir; |
ae63b31e SR |
1440 | struct trace_array *tr = inode->i_private; |
1441 | int ret; | |
1442 | ||
d6d3523c GB |
1443 | if (tracing_is_disabled()) |
1444 | return -ENODEV; | |
1445 | ||
8e2e2fa4 SRRH |
1446 | if (trace_array_get(tr) < 0) |
1447 | return -ENODEV; | |
1448 | ||
ae63b31e SR |
1449 | /* Make a temporary dir that has no system but points to tr */ |
1450 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
8e2e2fa4 SRRH |
1451 | if (!dir) { |
1452 | trace_array_put(tr); | |
ae63b31e | 1453 | return -ENOMEM; |
8e2e2fa4 | 1454 | } |
ae63b31e SR |
1455 | |
1456 | dir->tr = tr; | |
1457 | ||
1458 | ret = tracing_open_generic(inode, filp); | |
8e2e2fa4 SRRH |
1459 | if (ret < 0) { |
1460 | trace_array_put(tr); | |
ae63b31e | 1461 | kfree(dir); |
d6d3523c | 1462 | return ret; |
8e2e2fa4 | 1463 | } |
ae63b31e SR |
1464 | |
1465 | filp->private_data = dir; | |
e9dbfae5 | 1466 | |
d6d3523c | 1467 | return 0; |
e9dbfae5 SR |
1468 | } |
1469 | ||
1470 | static int subsystem_release(struct inode *inode, struct file *file) | |
1471 | { | |
7967b3e0 | 1472 | struct trace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1473 | |
8e2e2fa4 SRRH |
1474 | trace_array_put(dir->tr); |
1475 | ||
ae63b31e SR |
1476 | /* |
1477 | * If dir->subsystem is NULL, then this is a temporary | |
1478 | * descriptor that was made for a trace_array to enable | |
1479 | * all subsystems. | |
1480 | */ | |
1481 | if (dir->subsystem) | |
1482 | put_system(dir); | |
1483 | else | |
1484 | kfree(dir); | |
e9dbfae5 SR |
1485 | |
1486 | return 0; | |
1487 | } | |
1488 | ||
cfb180f3 TZ |
1489 | static ssize_t |
1490 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1491 | loff_t *ppos) | |
1492 | { | |
7967b3e0 | 1493 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1494 | struct event_subsystem *system = dir->subsystem; |
cfb180f3 TZ |
1495 | struct trace_seq *s; |
1496 | int r; | |
1497 | ||
1498 | if (*ppos) | |
1499 | return 0; | |
1500 | ||
1501 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1502 | if (!s) | |
1503 | return -ENOMEM; | |
1504 | ||
1505 | trace_seq_init(s); | |
1506 | ||
8b372562 | 1507 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1508 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1509 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1510 | |
1511 | kfree(s); | |
1512 | ||
1513 | return r; | |
1514 | } | |
1515 | ||
1516 | static ssize_t | |
1517 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1518 | loff_t *ppos) | |
1519 | { | |
7967b3e0 | 1520 | struct trace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1521 | char *buf; |
cfb180f3 TZ |
1522 | int err; |
1523 | ||
8b372562 | 1524 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1525 | return -EINVAL; |
1526 | ||
70f6cbb6 AV |
1527 | buf = memdup_user_nul(ubuf, cnt); |
1528 | if (IS_ERR(buf)) | |
1529 | return PTR_ERR(buf); | |
cfb180f3 | 1530 | |
ae63b31e | 1531 | err = apply_subsystem_event_filter(dir, buf); |
70f6cbb6 | 1532 | kfree(buf); |
8b372562 | 1533 | if (err < 0) |
44e9c8b7 | 1534 | return err; |
cfb180f3 TZ |
1535 | |
1536 | *ppos += cnt; | |
1537 | ||
1538 | return cnt; | |
1539 | } | |
1540 | ||
d1b182a8 SR |
1541 | static ssize_t |
1542 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1543 | { | |
1544 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1545 | struct trace_seq *s; | |
1546 | int r; | |
1547 | ||
1548 | if (*ppos) | |
1549 | return 0; | |
1550 | ||
1551 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1552 | if (!s) | |
1553 | return -ENOMEM; | |
1554 | ||
1555 | trace_seq_init(s); | |
1556 | ||
1557 | func(s); | |
5ac48378 SRRH |
1558 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1559 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1560 | |
1561 | kfree(s); | |
1562 | ||
1563 | return r; | |
1564 | } | |
1565 | ||
8ca532ad SRRH |
1566 | static void ignore_task_cpu(void *data) |
1567 | { | |
1568 | struct trace_array *tr = data; | |
1569 | struct trace_pid_list *pid_list; | |
1570 | ||
1571 | /* | |
1572 | * This function is called by on_each_cpu() while the | |
1573 | * event_mutex is held. | |
1574 | */ | |
1575 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
1576 | mutex_is_locked(&event_mutex)); | |
1577 | ||
1578 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 1579 | trace_ignore_this_task(pid_list, current)); |
8ca532ad SRRH |
1580 | } |
1581 | ||
49090107 | 1582 | static ssize_t |
3fdaf80f | 1583 | ftrace_event_pid_write(struct file *filp, const char __user *ubuf, |
49090107 SRRH |
1584 | size_t cnt, loff_t *ppos) |
1585 | { | |
3fdaf80f | 1586 | struct seq_file *m = filp->private_data; |
49090107 SRRH |
1587 | struct trace_array *tr = m->private; |
1588 | struct trace_pid_list *filtered_pids = NULL; | |
f4d34a87 | 1589 | struct trace_pid_list *pid_list; |
3fdaf80f | 1590 | struct trace_event_file *file; |
76c813e2 | 1591 | ssize_t ret; |
49090107 SRRH |
1592 | |
1593 | if (!cnt) | |
1594 | return 0; | |
1595 | ||
1596 | ret = tracing_update_buffers(); | |
1597 | if (ret < 0) | |
1598 | return ret; | |
1599 | ||
49090107 | 1600 | mutex_lock(&event_mutex); |
76c813e2 | 1601 | |
f4d34a87 SR |
1602 | filtered_pids = rcu_dereference_protected(tr->filtered_pids, |
1603 | lockdep_is_held(&event_mutex)); | |
1604 | ||
76c813e2 SRRH |
1605 | ret = trace_pid_write(filtered_pids, &pid_list, ubuf, cnt); |
1606 | if (ret < 0) | |
f4d34a87 | 1607 | goto out; |
49090107 | 1608 | |
49090107 SRRH |
1609 | rcu_assign_pointer(tr->filtered_pids, pid_list); |
1610 | ||
3fdaf80f SRRH |
1611 | list_for_each_entry(file, &tr->events, list) { |
1612 | set_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
1613 | } | |
49090107 SRRH |
1614 | |
1615 | if (filtered_pids) { | |
e0a568dc | 1616 | tracepoint_synchronize_unregister(); |
76c813e2 SRRH |
1617 | trace_free_pid_list(filtered_pids); |
1618 | } else if (pid_list) { | |
3fdaf80f SRRH |
1619 | /* |
1620 | * Register a probe that is called before all other probes | |
1621 | * to set ignore_pid if next or prev do not match. | |
1622 | * Register a probe this is called after all other probes | |
1623 | * to only keep ignore_pid set if next pid matches. | |
1624 | */ | |
1625 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_pre, | |
1626 | tr, INT_MAX); | |
1627 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_post, | |
1628 | tr, 0); | |
1629 | ||
1630 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, | |
1631 | tr, INT_MAX); | |
1632 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, | |
1633 | tr, 0); | |
0f72e37e SRRH |
1634 | |
1635 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, | |
1636 | tr, INT_MAX); | |
1637 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, | |
1638 | tr, 0); | |
1639 | ||
1640 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_pre, | |
1641 | tr, INT_MAX); | |
1642 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_post, | |
1643 | tr, 0); | |
49090107 SRRH |
1644 | } |
1645 | ||
799fd44c SRRH |
1646 | /* |
1647 | * Ignoring of pids is done at task switch. But we have to | |
1648 | * check for those tasks that are currently running. | |
1649 | * Always do this in case a pid was appended or removed. | |
1650 | */ | |
1651 | on_each_cpu(ignore_task_cpu, tr, 1); | |
1652 | ||
f4d34a87 | 1653 | out: |
3fdaf80f SRRH |
1654 | mutex_unlock(&event_mutex); |
1655 | ||
76c813e2 SRRH |
1656 | if (ret > 0) |
1657 | *ppos += ret; | |
49090107 SRRH |
1658 | |
1659 | return ret; | |
1660 | } | |
1661 | ||
15075cac SR |
1662 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1663 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
49090107 | 1664 | static int ftrace_event_set_pid_open(struct inode *inode, struct file *file); |
f77d09a3 | 1665 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1666 | |
b77e38aa SR |
1667 | static const struct seq_operations show_event_seq_ops = { |
1668 | .start = t_start, | |
1669 | .next = t_next, | |
1670 | .show = t_show, | |
1671 | .stop = t_stop, | |
1672 | }; | |
1673 | ||
1674 | static const struct seq_operations show_set_event_seq_ops = { | |
1675 | .start = s_start, | |
1676 | .next = s_next, | |
1677 | .show = t_show, | |
1678 | .stop = t_stop, | |
1679 | }; | |
1680 | ||
49090107 SRRH |
1681 | static const struct seq_operations show_set_pid_seq_ops = { |
1682 | .start = p_start, | |
1683 | .next = p_next, | |
5cc8976b | 1684 | .show = trace_pid_show, |
49090107 SRRH |
1685 | .stop = p_stop, |
1686 | }; | |
1687 | ||
2314c4ae | 1688 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1689 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1690 | .read = seq_read, |
1691 | .llseek = seq_lseek, | |
1692 | .release = seq_release, | |
1693 | }; | |
1694 | ||
b77e38aa | 1695 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1696 | .open = ftrace_event_set_open, |
b77e38aa SR |
1697 | .read = seq_read, |
1698 | .write = ftrace_event_write, | |
1699 | .llseek = seq_lseek, | |
f77d09a3 | 1700 | .release = ftrace_event_release, |
b77e38aa SR |
1701 | }; |
1702 | ||
49090107 SRRH |
1703 | static const struct file_operations ftrace_set_event_pid_fops = { |
1704 | .open = ftrace_event_set_pid_open, | |
1705 | .read = seq_read, | |
1706 | .write = ftrace_event_pid_write, | |
1707 | .llseek = seq_lseek, | |
1708 | .release = ftrace_event_release, | |
1709 | }; | |
1710 | ||
1473e441 | 1711 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 1712 | .open = tracing_open_generic, |
1473e441 SR |
1713 | .read = event_enable_read, |
1714 | .write = event_enable_write, | |
6038f373 | 1715 | .llseek = default_llseek, |
1473e441 SR |
1716 | }; |
1717 | ||
981d081e | 1718 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1719 | .open = trace_format_open, |
1720 | .read = seq_read, | |
1721 | .llseek = seq_lseek, | |
1722 | .release = seq_release, | |
981d081e SR |
1723 | }; |
1724 | ||
23725aee | 1725 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1726 | .read = event_id_read, |
6038f373 | 1727 | .llseek = default_llseek, |
23725aee PZ |
1728 | }; |
1729 | ||
7ce7e424 TZ |
1730 | static const struct file_operations ftrace_event_filter_fops = { |
1731 | .open = tracing_open_generic, | |
1732 | .read = event_filter_read, | |
1733 | .write = event_filter_write, | |
6038f373 | 1734 | .llseek = default_llseek, |
7ce7e424 TZ |
1735 | }; |
1736 | ||
cfb180f3 | 1737 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1738 | .open = subsystem_open, |
cfb180f3 TZ |
1739 | .read = subsystem_filter_read, |
1740 | .write = subsystem_filter_write, | |
6038f373 | 1741 | .llseek = default_llseek, |
e9dbfae5 | 1742 | .release = subsystem_release, |
cfb180f3 TZ |
1743 | }; |
1744 | ||
8ae79a13 | 1745 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1746 | .open = subsystem_open, |
8ae79a13 SR |
1747 | .read = system_enable_read, |
1748 | .write = system_enable_write, | |
6038f373 | 1749 | .llseek = default_llseek, |
40ee4dff | 1750 | .release = subsystem_release, |
8ae79a13 SR |
1751 | }; |
1752 | ||
ae63b31e SR |
1753 | static const struct file_operations ftrace_tr_enable_fops = { |
1754 | .open = system_tr_open, | |
1755 | .read = system_enable_read, | |
1756 | .write = system_enable_write, | |
1757 | .llseek = default_llseek, | |
1758 | .release = subsystem_release, | |
1759 | }; | |
1760 | ||
d1b182a8 SR |
1761 | static const struct file_operations ftrace_show_header_fops = { |
1762 | .open = tracing_open_generic, | |
1763 | .read = show_header, | |
6038f373 | 1764 | .llseek = default_llseek, |
d1b182a8 SR |
1765 | }; |
1766 | ||
ae63b31e SR |
1767 | static int |
1768 | ftrace_event_open(struct inode *inode, struct file *file, | |
1769 | const struct seq_operations *seq_ops) | |
1473e441 | 1770 | { |
ae63b31e SR |
1771 | struct seq_file *m; |
1772 | int ret; | |
1473e441 | 1773 | |
ae63b31e SR |
1774 | ret = seq_open(file, seq_ops); |
1775 | if (ret < 0) | |
1776 | return ret; | |
1777 | m = file->private_data; | |
1778 | /* copy tr over to seq ops */ | |
1779 | m->private = inode->i_private; | |
1473e441 | 1780 | |
ae63b31e | 1781 | return ret; |
1473e441 SR |
1782 | } |
1783 | ||
f77d09a3 AL |
1784 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1785 | { | |
1786 | struct trace_array *tr = inode->i_private; | |
1787 | ||
1788 | trace_array_put(tr); | |
1789 | ||
1790 | return seq_release(inode, file); | |
1791 | } | |
1792 | ||
15075cac SR |
1793 | static int |
1794 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1795 | { | |
1796 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1797 | ||
ae63b31e | 1798 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1799 | } |
1800 | ||
1801 | static int | |
1802 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1803 | { | |
1804 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1805 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
1806 | int ret; |
1807 | ||
1808 | if (trace_array_get(tr) < 0) | |
1809 | return -ENODEV; | |
15075cac SR |
1810 | |
1811 | if ((file->f_mode & FMODE_WRITE) && | |
1812 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1813 | ftrace_clear_events(tr); |
15075cac | 1814 | |
f77d09a3 AL |
1815 | ret = ftrace_event_open(inode, file, seq_ops); |
1816 | if (ret < 0) | |
1817 | trace_array_put(tr); | |
1818 | return ret; | |
ae63b31e SR |
1819 | } |
1820 | ||
49090107 SRRH |
1821 | static int |
1822 | ftrace_event_set_pid_open(struct inode *inode, struct file *file) | |
1823 | { | |
1824 | const struct seq_operations *seq_ops = &show_set_pid_seq_ops; | |
1825 | struct trace_array *tr = inode->i_private; | |
1826 | int ret; | |
1827 | ||
1828 | if (trace_array_get(tr) < 0) | |
1829 | return -ENODEV; | |
1830 | ||
1831 | if ((file->f_mode & FMODE_WRITE) && | |
1832 | (file->f_flags & O_TRUNC)) | |
1833 | ftrace_clear_event_pids(tr); | |
1834 | ||
1835 | ret = ftrace_event_open(inode, file, seq_ops); | |
1836 | if (ret < 0) | |
1837 | trace_array_put(tr); | |
1838 | return ret; | |
1839 | } | |
1840 | ||
ae63b31e SR |
1841 | static struct event_subsystem * |
1842 | create_new_subsystem(const char *name) | |
1843 | { | |
1844 | struct event_subsystem *system; | |
1845 | ||
1846 | /* need to create new entry */ | |
1847 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1848 | if (!system) | |
1849 | return NULL; | |
1850 | ||
1851 | system->ref_count = 1; | |
6e94a780 SR |
1852 | |
1853 | /* Only allocate if dynamic (kprobes and modules) */ | |
79ac6ef5 RV |
1854 | system->name = kstrdup_const(name, GFP_KERNEL); |
1855 | if (!system->name) | |
1856 | goto out_free; | |
ae63b31e SR |
1857 | |
1858 | system->filter = NULL; | |
1859 | ||
1860 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1861 | if (!system->filter) | |
1862 | goto out_free; | |
1863 | ||
1864 | list_add(&system->list, &event_subsystems); | |
1865 | ||
1866 | return system; | |
1867 | ||
1868 | out_free: | |
79ac6ef5 | 1869 | kfree_const(system->name); |
ae63b31e SR |
1870 | kfree(system); |
1871 | return NULL; | |
15075cac SR |
1872 | } |
1873 | ||
6ecc2d1c | 1874 | static struct dentry * |
ae63b31e | 1875 | event_subsystem_dir(struct trace_array *tr, const char *name, |
7f1d2f82 | 1876 | struct trace_event_file *file, struct dentry *parent) |
6ecc2d1c | 1877 | { |
7967b3e0 | 1878 | struct trace_subsystem_dir *dir; |
6ecc2d1c | 1879 | struct event_subsystem *system; |
e1112b4d | 1880 | struct dentry *entry; |
6ecc2d1c SR |
1881 | |
1882 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1883 | list_for_each_entry(dir, &tr->systems, list) { |
1884 | system = dir->subsystem; | |
dc82ec98 | 1885 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1886 | dir->nr_events++; |
1887 | file->system = dir; | |
1888 | return dir->entry; | |
dc82ec98 | 1889 | } |
6ecc2d1c SR |
1890 | } |
1891 | ||
ae63b31e SR |
1892 | /* Now see if the system itself exists. */ |
1893 | list_for_each_entry(system, &event_subsystems, list) { | |
1894 | if (strcmp(system->name, name) == 0) | |
1895 | break; | |
6ecc2d1c | 1896 | } |
ae63b31e SR |
1897 | /* Reset system variable when not found */ |
1898 | if (&system->list == &event_subsystems) | |
1899 | system = NULL; | |
6ecc2d1c | 1900 | |
ae63b31e SR |
1901 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1902 | if (!dir) | |
1903 | goto out_fail; | |
6ecc2d1c | 1904 | |
ae63b31e SR |
1905 | if (!system) { |
1906 | system = create_new_subsystem(name); | |
1907 | if (!system) | |
1908 | goto out_free; | |
1909 | } else | |
1910 | __get_system(system); | |
1911 | ||
8434dc93 | 1912 | dir->entry = tracefs_create_dir(name, parent); |
ae63b31e | 1913 | if (!dir->entry) { |
3448bac3 | 1914 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
1915 | __put_system(system); |
1916 | goto out_free; | |
6d723736 SR |
1917 | } |
1918 | ||
ae63b31e SR |
1919 | dir->tr = tr; |
1920 | dir->ref_count = 1; | |
1921 | dir->nr_events = 1; | |
1922 | dir->subsystem = system; | |
1923 | file->system = dir; | |
8b372562 | 1924 | |
8434dc93 | 1925 | entry = tracefs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1926 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1927 | if (!entry) { |
1928 | kfree(system->filter); | |
1929 | system->filter = NULL; | |
8434dc93 | 1930 | pr_warn("Could not create tracefs '%s/filter' entry\n", name); |
8b372562 | 1931 | } |
e1112b4d | 1932 | |
ae63b31e | 1933 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1934 | &ftrace_system_enable_fops); |
8ae79a13 | 1935 | |
ae63b31e SR |
1936 | list_add(&dir->list, &tr->systems); |
1937 | ||
1938 | return dir->entry; | |
1939 | ||
1940 | out_free: | |
1941 | kfree(dir); | |
1942 | out_fail: | |
1943 | /* Only print this message if failed on memory allocation */ | |
1944 | if (!dir || !system) | |
3448bac3 | 1945 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 1946 | return NULL; |
6ecc2d1c SR |
1947 | } |
1948 | ||
1473e441 | 1949 | static int |
7f1d2f82 | 1950 | event_create_dir(struct dentry *parent, struct trace_event_file *file) |
1473e441 | 1951 | { |
2425bcb9 | 1952 | struct trace_event_call *call = file->event_call; |
ae63b31e | 1953 | struct trace_array *tr = file->tr; |
2e33af02 | 1954 | struct list_head *head; |
ae63b31e | 1955 | struct dentry *d_events; |
de7b2973 | 1956 | const char *name; |
fd994989 | 1957 | int ret; |
1473e441 | 1958 | |
6ecc2d1c SR |
1959 | /* |
1960 | * If the trace point header did not define TRACE_SYSTEM | |
1961 | * then the system would be called "TRACE_SYSTEM". | |
1962 | */ | |
ae63b31e SR |
1963 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1964 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1965 | if (!d_events) | |
1966 | return -ENOMEM; | |
1967 | } else | |
1968 | d_events = parent; | |
1969 | ||
687fcc4a | 1970 | name = trace_event_name(call); |
8434dc93 | 1971 | file->dir = tracefs_create_dir(name, d_events); |
ae63b31e | 1972 | if (!file->dir) { |
8434dc93 | 1973 | pr_warn("Could not create tracefs '%s' directory\n", name); |
1473e441 SR |
1974 | return -1; |
1975 | } | |
1976 | ||
9b63776f | 1977 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1978 | trace_create_file("enable", 0644, file->dir, file, |
620a30e9 | 1979 | &ftrace_enable_fops); |
1473e441 | 1980 | |
2239291a | 1981 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1982 | if (call->event.type && call->class->reg) |
1a11126b | 1983 | trace_create_file("id", 0444, file->dir, |
620a30e9 ON |
1984 | (void *)(long)call->event.type, |
1985 | &ftrace_event_id_fops); | |
2239291a | 1986 | #endif |
23725aee | 1987 | |
c9d932cf LZ |
1988 | /* |
1989 | * Other events may have the same class. Only update | |
1990 | * the fields if they are not already defined. | |
1991 | */ | |
1992 | head = trace_get_fields(call); | |
1993 | if (list_empty(head)) { | |
1994 | ret = call->class->define_fields(call); | |
1995 | if (ret < 0) { | |
3448bac3 FF |
1996 | pr_warn("Could not initialize trace point events/%s\n", |
1997 | name); | |
ae63b31e | 1998 | return -1; |
cf027f64 TZ |
1999 | } |
2000 | } | |
2001 | ||
854145e0 CH |
2002 | /* |
2003 | * Only event directories that can be enabled should have | |
5d948c86 | 2004 | * triggers or filters. |
854145e0 | 2005 | */ |
5d948c86 SRV |
2006 | if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) { |
2007 | trace_create_file("filter", 0644, file->dir, file, | |
2008 | &ftrace_event_filter_fops); | |
2009 | ||
854145e0 CH |
2010 | trace_create_file("trigger", 0644, file->dir, file, |
2011 | &event_trigger_fops); | |
5d948c86 | 2012 | } |
85f2b082 | 2013 | |
7ef224d1 TZ |
2014 | #ifdef CONFIG_HIST_TRIGGERS |
2015 | trace_create_file("hist", 0444, file->dir, file, | |
2016 | &event_hist_fops); | |
2017 | #endif | |
ae63b31e | 2018 | trace_create_file("format", 0444, file->dir, call, |
620a30e9 | 2019 | &ftrace_event_format_fops); |
6d723736 SR |
2020 | |
2021 | return 0; | |
2022 | } | |
2023 | ||
2425bcb9 | 2024 | static void remove_event_from_tracers(struct trace_event_call *call) |
ae63b31e | 2025 | { |
7f1d2f82 | 2026 | struct trace_event_file *file; |
ae63b31e SR |
2027 | struct trace_array *tr; |
2028 | ||
2029 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
2030 | if (file->event_call != call) |
2031 | continue; | |
2032 | ||
f6a84bdc | 2033 | remove_event_file_dir(file); |
ae63b31e SR |
2034 | /* |
2035 | * The do_for_each_event_file_safe() is | |
2036 | * a double loop. After finding the call for this | |
2037 | * trace_array, we use break to jump to the next | |
2038 | * trace_array. | |
2039 | */ | |
2040 | break; | |
2041 | } while_for_each_event_file(); | |
2042 | } | |
2043 | ||
2425bcb9 | 2044 | static void event_remove(struct trace_event_call *call) |
8781915a | 2045 | { |
ae63b31e | 2046 | struct trace_array *tr; |
7f1d2f82 | 2047 | struct trace_event_file *file; |
ae63b31e SR |
2048 | |
2049 | do_for_each_event_file(tr, file) { | |
2050 | if (file->event_call != call) | |
2051 | continue; | |
065e63f9 SRV |
2052 | |
2053 | if (file->flags & EVENT_FILE_FL_WAS_ENABLED) | |
2054 | tr->clear_trace = true; | |
2055 | ||
ae63b31e SR |
2056 | ftrace_event_enable_disable(file, 0); |
2057 | /* | |
2058 | * The do_for_each_event_file() is | |
2059 | * a double loop. After finding the call for this | |
2060 | * trace_array, we use break to jump to the next | |
2061 | * trace_array. | |
2062 | */ | |
2063 | break; | |
2064 | } while_for_each_event_file(); | |
2065 | ||
8781915a | 2066 | if (call->event.funcs) |
9023c930 | 2067 | __unregister_trace_event(&call->event); |
ae63b31e | 2068 | remove_event_from_tracers(call); |
8781915a EG |
2069 | list_del(&call->list); |
2070 | } | |
2071 | ||
2425bcb9 | 2072 | static int event_init(struct trace_event_call *call) |
8781915a EG |
2073 | { |
2074 | int ret = 0; | |
de7b2973 | 2075 | const char *name; |
8781915a | 2076 | |
687fcc4a | 2077 | name = trace_event_name(call); |
de7b2973 | 2078 | if (WARN_ON(!name)) |
8781915a EG |
2079 | return -EINVAL; |
2080 | ||
2081 | if (call->class->raw_init) { | |
2082 | ret = call->class->raw_init(call); | |
2083 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 2084 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
2085 | } |
2086 | ||
2087 | return ret; | |
2088 | } | |
2089 | ||
67ead0a6 | 2090 | static int |
2425bcb9 | 2091 | __register_event(struct trace_event_call *call, struct module *mod) |
bd1a5c84 | 2092 | { |
bd1a5c84 | 2093 | int ret; |
6d723736 | 2094 | |
8781915a EG |
2095 | ret = event_init(call); |
2096 | if (ret < 0) | |
2097 | return ret; | |
701970b3 | 2098 | |
ae63b31e | 2099 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 2100 | call->mod = mod; |
88f70d75 | 2101 | |
ae63b31e | 2102 | return 0; |
bd1a5c84 MH |
2103 | } |
2104 | ||
67ec0d85 | 2105 | static char *eval_replace(char *ptr, struct trace_eval_map *map, int len) |
0c564a53 SRRH |
2106 | { |
2107 | int rlen; | |
2108 | int elen; | |
2109 | ||
67ec0d85 | 2110 | /* Find the length of the eval value as a string */ |
00f4b652 | 2111 | elen = snprintf(ptr, 0, "%ld", map->eval_value); |
0c564a53 SRRH |
2112 | /* Make sure there's enough room to replace the string with the value */ |
2113 | if (len < elen) | |
2114 | return NULL; | |
2115 | ||
00f4b652 | 2116 | snprintf(ptr, elen + 1, "%ld", map->eval_value); |
0c564a53 SRRH |
2117 | |
2118 | /* Get the rest of the string of ptr */ | |
2119 | rlen = strlen(ptr + len); | |
2120 | memmove(ptr + elen, ptr + len, rlen); | |
2121 | /* Make sure we end the new string */ | |
2122 | ptr[elen + rlen] = 0; | |
2123 | ||
2124 | return ptr + elen; | |
2125 | } | |
2126 | ||
2425bcb9 | 2127 | static void update_event_printk(struct trace_event_call *call, |
00f4b652 | 2128 | struct trace_eval_map *map) |
0c564a53 SRRH |
2129 | { |
2130 | char *ptr; | |
2131 | int quote = 0; | |
00f4b652 | 2132 | int len = strlen(map->eval_string); |
0c564a53 SRRH |
2133 | |
2134 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
2135 | if (*ptr == '\\') { | |
2136 | ptr++; | |
2137 | /* paranoid */ | |
2138 | if (!*ptr) | |
2139 | break; | |
2140 | continue; | |
2141 | } | |
2142 | if (*ptr == '"') { | |
2143 | quote ^= 1; | |
2144 | continue; | |
2145 | } | |
2146 | if (quote) | |
2147 | continue; | |
2148 | if (isdigit(*ptr)) { | |
2149 | /* skip numbers */ | |
2150 | do { | |
2151 | ptr++; | |
2152 | /* Check for alpha chars like ULL */ | |
2153 | } while (isalnum(*ptr)); | |
3193899d SRRH |
2154 | if (!*ptr) |
2155 | break; | |
0c564a53 SRRH |
2156 | /* |
2157 | * A number must have some kind of delimiter after | |
2158 | * it, and we can ignore that too. | |
2159 | */ | |
2160 | continue; | |
2161 | } | |
2162 | if (isalpha(*ptr) || *ptr == '_') { | |
00f4b652 | 2163 | if (strncmp(map->eval_string, ptr, len) == 0 && |
0c564a53 | 2164 | !isalnum(ptr[len]) && ptr[len] != '_') { |
67ec0d85 JL |
2165 | ptr = eval_replace(ptr, map, len); |
2166 | /* enum/sizeof string smaller than value */ | |
0c564a53 SRRH |
2167 | if (WARN_ON_ONCE(!ptr)) |
2168 | return; | |
2169 | /* | |
67ec0d85 | 2170 | * No need to decrement here, as eval_replace() |
0c564a53 | 2171 | * returns the pointer to the character passed |
67ec0d85 | 2172 | * the eval, and two evals can not be placed |
0c564a53 SRRH |
2173 | * back to back without something in between. |
2174 | * We can skip that something in between. | |
2175 | */ | |
2176 | continue; | |
2177 | } | |
2178 | skip_more: | |
2179 | do { | |
2180 | ptr++; | |
2181 | } while (isalnum(*ptr) || *ptr == '_'); | |
3193899d SRRH |
2182 | if (!*ptr) |
2183 | break; | |
0c564a53 SRRH |
2184 | /* |
2185 | * If what comes after this variable is a '.' or | |
2186 | * '->' then we can continue to ignore that string. | |
2187 | */ | |
2188 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
2189 | ptr += *ptr == '.' ? 1 : 2; | |
3193899d SRRH |
2190 | if (!*ptr) |
2191 | break; | |
0c564a53 SRRH |
2192 | goto skip_more; |
2193 | } | |
2194 | /* | |
2195 | * Once again, we can skip the delimiter that came | |
2196 | * after the string. | |
2197 | */ | |
2198 | continue; | |
2199 | } | |
2200 | } | |
2201 | } | |
2202 | ||
f57a4143 | 2203 | void trace_event_eval_update(struct trace_eval_map **map, int len) |
0c564a53 | 2204 | { |
2425bcb9 | 2205 | struct trace_event_call *call, *p; |
0c564a53 | 2206 | const char *last_system = NULL; |
1ebe1eaf | 2207 | bool first = false; |
0c564a53 SRRH |
2208 | int last_i; |
2209 | int i; | |
2210 | ||
2211 | down_write(&trace_event_sem); | |
2212 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
2213 | /* events are usually grouped together with systems */ | |
2214 | if (!last_system || call->class->system != last_system) { | |
1ebe1eaf | 2215 | first = true; |
0c564a53 SRRH |
2216 | last_i = 0; |
2217 | last_system = call->class->system; | |
2218 | } | |
2219 | ||
1ebe1eaf SRV |
2220 | /* |
2221 | * Since calls are grouped by systems, the likelyhood that the | |
2222 | * next call in the iteration belongs to the same system as the | |
2223 | * previous call is high. As an optimization, we skip seaching | |
2224 | * for a map[] that matches the call's system if the last call | |
2225 | * was from the same system. That's what last_i is for. If the | |
2226 | * call has the same system as the previous call, then last_i | |
2227 | * will be the index of the first map[] that has a matching | |
2228 | * system. | |
2229 | */ | |
0c564a53 SRRH |
2230 | for (i = last_i; i < len; i++) { |
2231 | if (call->class->system == map[i]->system) { | |
2232 | /* Save the first system if need be */ | |
1ebe1eaf | 2233 | if (first) { |
0c564a53 | 2234 | last_i = i; |
1ebe1eaf SRV |
2235 | first = false; |
2236 | } | |
0c564a53 SRRH |
2237 | update_event_printk(call, map[i]); |
2238 | } | |
2239 | } | |
2240 | } | |
2241 | up_write(&trace_event_sem); | |
2242 | } | |
2243 | ||
7f1d2f82 | 2244 | static struct trace_event_file * |
2425bcb9 | 2245 | trace_create_new_event(struct trace_event_call *call, |
da511bf3 SRRH |
2246 | struct trace_array *tr) |
2247 | { | |
7f1d2f82 | 2248 | struct trace_event_file *file; |
da511bf3 SRRH |
2249 | |
2250 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
2251 | if (!file) | |
2252 | return NULL; | |
2253 | ||
2254 | file->event_call = call; | |
2255 | file->tr = tr; | |
2256 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
2257 | atomic_set(&file->tm_ref, 0); |
2258 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
2259 | list_add(&file->list, &tr->events); |
2260 | ||
2261 | return file; | |
2262 | } | |
2263 | ||
ae63b31e SR |
2264 | /* Add an event to a trace directory */ |
2265 | static int | |
2425bcb9 | 2266 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) |
ae63b31e | 2267 | { |
7f1d2f82 | 2268 | struct trace_event_file *file; |
ae63b31e | 2269 | |
da511bf3 | 2270 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
2271 | if (!file) |
2272 | return -ENOMEM; | |
2273 | ||
620a30e9 | 2274 | return event_create_dir(tr->event_dir, file); |
ae63b31e SR |
2275 | } |
2276 | ||
77248221 SR |
2277 | /* |
2278 | * Just create a decriptor for early init. A descriptor is required | |
2279 | * for enabling events at boot. We want to enable events before | |
2280 | * the filesystem is initialized. | |
2281 | */ | |
2282 | static __init int | |
2425bcb9 | 2283 | __trace_early_add_new_event(struct trace_event_call *call, |
77248221 SR |
2284 | struct trace_array *tr) |
2285 | { | |
7f1d2f82 | 2286 | struct trace_event_file *file; |
77248221 | 2287 | |
da511bf3 | 2288 | file = trace_create_new_event(call, tr); |
77248221 SR |
2289 | if (!file) |
2290 | return -ENOMEM; | |
2291 | ||
77248221 SR |
2292 | return 0; |
2293 | } | |
2294 | ||
ae63b31e | 2295 | struct ftrace_module_file_ops; |
2425bcb9 | 2296 | static void __add_event_to_tracers(struct trace_event_call *call); |
ae63b31e | 2297 | |
7e1413ed SRV |
2298 | /* Add an additional event_call dynamically */ |
2299 | int trace_add_event_call(struct trace_event_call *call) | |
bd1a5c84 MH |
2300 | { |
2301 | int ret; | |
fc800a10 MH |
2302 | lockdep_assert_held(&event_mutex); |
2303 | ||
12ecef0c | 2304 | mutex_lock(&trace_types_lock); |
701970b3 | 2305 | |
ae63b31e SR |
2306 | ret = __register_event(call, NULL); |
2307 | if (ret >= 0) | |
779c5e37 | 2308 | __add_event_to_tracers(call); |
a2ca5e03 | 2309 | |
a8227415 | 2310 | mutex_unlock(&trace_types_lock); |
fc800a10 MH |
2311 | return ret; |
2312 | } | |
2313 | ||
4fead8e4 | 2314 | /* |
a8227415 AL |
2315 | * Must be called under locking of trace_types_lock, event_mutex and |
2316 | * trace_event_sem. | |
4fead8e4 | 2317 | */ |
2425bcb9 | 2318 | static void __trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2319 | { |
8781915a | 2320 | event_remove(call); |
bd1a5c84 | 2321 | trace_destroy_fields(call); |
57375747 ON |
2322 | free_event_filter(call->filter); |
2323 | call->filter = NULL; | |
bd1a5c84 MH |
2324 | } |
2325 | ||
2425bcb9 | 2326 | static int probe_remove_event_call(struct trace_event_call *call) |
2816c551 ON |
2327 | { |
2328 | struct trace_array *tr; | |
7f1d2f82 | 2329 | struct trace_event_file *file; |
2816c551 ON |
2330 | |
2331 | #ifdef CONFIG_PERF_EVENTS | |
2332 | if (call->perf_refcount) | |
2333 | return -EBUSY; | |
2334 | #endif | |
2335 | do_for_each_event_file(tr, file) { | |
2336 | if (file->event_call != call) | |
2337 | continue; | |
2338 | /* | |
2339 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
5d6ad960 | 2340 | * we are going to do, EVENT_FILE_FL_SOFT_MODE can suppress |
2816c551 ON |
2341 | * TRACE_REG_UNREGISTER. |
2342 | */ | |
5d6ad960 | 2343 | if (file->flags & EVENT_FILE_FL_ENABLED) |
2816c551 | 2344 | return -EBUSY; |
2ba64035 SRRH |
2345 | /* |
2346 | * The do_for_each_event_file_safe() is | |
2347 | * a double loop. After finding the call for this | |
2348 | * trace_array, we use break to jump to the next | |
2349 | * trace_array. | |
2350 | */ | |
2816c551 ON |
2351 | break; |
2352 | } while_for_each_event_file(); | |
2353 | ||
2354 | __trace_remove_event_call(call); | |
2355 | ||
2356 | return 0; | |
2357 | } | |
2358 | ||
7e1413ed SRV |
2359 | /* Remove an event_call */ |
2360 | int trace_remove_event_call(struct trace_event_call *call) | |
bd1a5c84 | 2361 | { |
2816c551 ON |
2362 | int ret; |
2363 | ||
fc800a10 MH |
2364 | lockdep_assert_held(&event_mutex); |
2365 | ||
12ecef0c | 2366 | mutex_lock(&trace_types_lock); |
52f6ad6d | 2367 | down_write(&trace_event_sem); |
2816c551 | 2368 | ret = probe_remove_event_call(call); |
52f6ad6d | 2369 | up_write(&trace_event_sem); |
a8227415 | 2370 | mutex_unlock(&trace_types_lock); |
fc800a10 MH |
2371 | |
2372 | return ret; | |
2373 | } | |
2374 | ||
bd1a5c84 MH |
2375 | #define for_each_event(event, start, end) \ |
2376 | for (event = start; \ | |
2377 | (unsigned long)event < (unsigned long)end; \ | |
2378 | event++) | |
2379 | ||
2380 | #ifdef CONFIG_MODULES | |
2381 | ||
6d723736 SR |
2382 | static void trace_module_add_events(struct module *mod) |
2383 | { | |
2425bcb9 | 2384 | struct trace_event_call **call, **start, **end; |
6d723736 | 2385 | |
45ab2813 SRRH |
2386 | if (!mod->num_trace_events) |
2387 | return; | |
2388 | ||
2389 | /* Don't add infrastructure for mods without tracepoints */ | |
2390 | if (trace_module_has_bad_taint(mod)) { | |
2391 | pr_err("%s: module has bad taint, not creating trace events\n", | |
2392 | mod->name); | |
2393 | return; | |
2394 | } | |
2395 | ||
6d723736 SR |
2396 | start = mod->trace_events; |
2397 | end = mod->trace_events + mod->num_trace_events; | |
2398 | ||
6d723736 | 2399 | for_each_event(call, start, end) { |
ae63b31e | 2400 | __register_event(*call, mod); |
779c5e37 | 2401 | __add_event_to_tracers(*call); |
6d723736 SR |
2402 | } |
2403 | } | |
2404 | ||
2405 | static void trace_module_remove_events(struct module *mod) | |
2406 | { | |
2425bcb9 | 2407 | struct trace_event_call *call, *p; |
6d723736 | 2408 | |
52f6ad6d | 2409 | down_write(&trace_event_sem); |
6d723736 | 2410 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
065e63f9 | 2411 | if (call->mod == mod) |
bd1a5c84 | 2412 | __trace_remove_event_call(call); |
6d723736 | 2413 | } |
52f6ad6d | 2414 | up_write(&trace_event_sem); |
9456f0fa SR |
2415 | |
2416 | /* | |
2417 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
2418 | * registered any events that were used. The only worry is if |
2419 | * a new module gets loaded, and takes on the same id as the events | |
2420 | * of this module. When printing out the buffer, traced events left | |
2421 | * over from this module may be passed to the new module events and | |
2422 | * unexpected results may occur. | |
9456f0fa | 2423 | */ |
065e63f9 | 2424 | tracing_reset_all_online_cpus(); |
6d723736 SR |
2425 | } |
2426 | ||
61f919a1 SR |
2427 | static int trace_module_notify(struct notifier_block *self, |
2428 | unsigned long val, void *data) | |
6d723736 SR |
2429 | { |
2430 | struct module *mod = data; | |
2431 | ||
2432 | mutex_lock(&event_mutex); | |
12ecef0c | 2433 | mutex_lock(&trace_types_lock); |
6d723736 SR |
2434 | switch (val) { |
2435 | case MODULE_STATE_COMING: | |
2436 | trace_module_add_events(mod); | |
2437 | break; | |
2438 | case MODULE_STATE_GOING: | |
2439 | trace_module_remove_events(mod); | |
2440 | break; | |
2441 | } | |
a8227415 | 2442 | mutex_unlock(&trace_types_lock); |
12ecef0c | 2443 | mutex_unlock(&event_mutex); |
fd994989 | 2444 | |
1473e441 SR |
2445 | return 0; |
2446 | } | |
315326c1 | 2447 | |
836d481e ON |
2448 | static struct notifier_block trace_module_nb = { |
2449 | .notifier_call = trace_module_notify, | |
3673b8e4 | 2450 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 2451 | }; |
61f919a1 | 2452 | #endif /* CONFIG_MODULES */ |
1473e441 | 2453 | |
ae63b31e SR |
2454 | /* Create a new event directory structure for a trace directory. */ |
2455 | static void | |
2456 | __trace_add_event_dirs(struct trace_array *tr) | |
2457 | { | |
2425bcb9 | 2458 | struct trace_event_call *call; |
ae63b31e SR |
2459 | int ret; |
2460 | ||
2461 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 2462 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 2463 | if (ret < 0) |
3448bac3 | 2464 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2465 | trace_event_name(call)); |
ae63b31e SR |
2466 | } |
2467 | } | |
2468 | ||
3c96529c | 2469 | /* Returns any file that matches the system and event */ |
7f1d2f82 | 2470 | struct trace_event_file * |
3c96529c | 2471 | __find_event_file(struct trace_array *tr, const char *system, const char *event) |
3cd715de | 2472 | { |
7f1d2f82 | 2473 | struct trace_event_file *file; |
2425bcb9 | 2474 | struct trace_event_call *call; |
de7b2973 | 2475 | const char *name; |
3cd715de SRRH |
2476 | |
2477 | list_for_each_entry(file, &tr->events, list) { | |
2478 | ||
2479 | call = file->event_call; | |
687fcc4a | 2480 | name = trace_event_name(call); |
3cd715de | 2481 | |
3c96529c | 2482 | if (!name || !call->class) |
3cd715de SRRH |
2483 | continue; |
2484 | ||
de7b2973 | 2485 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
2486 | strcmp(system, call->class->system) == 0) |
2487 | return file; | |
2488 | } | |
2489 | return NULL; | |
2490 | } | |
2491 | ||
3c96529c SRV |
2492 | /* Returns valid trace event files that match system and event */ |
2493 | struct trace_event_file * | |
2494 | find_event_file(struct trace_array *tr, const char *system, const char *event) | |
2495 | { | |
2496 | struct trace_event_file *file; | |
2497 | ||
2498 | file = __find_event_file(tr, system, event); | |
2499 | if (!file || !file->event_call->class->reg || | |
2500 | file->event_call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2501 | return NULL; | |
2502 | ||
2503 | return file; | |
2504 | } | |
2505 | ||
2875a08b SRRH |
2506 | #ifdef CONFIG_DYNAMIC_FTRACE |
2507 | ||
2508 | /* Avoid typos */ | |
2509 | #define ENABLE_EVENT_STR "enable_event" | |
2510 | #define DISABLE_EVENT_STR "disable_event" | |
2511 | ||
2512 | struct event_probe_data { | |
7f1d2f82 | 2513 | struct trace_event_file *file; |
2875a08b SRRH |
2514 | unsigned long count; |
2515 | int ref; | |
2516 | bool enable; | |
2517 | }; | |
2518 | ||
41794f19 SRV |
2519 | static void update_event_probe(struct event_probe_data *data) |
2520 | { | |
2521 | if (data->enable) | |
2522 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2523 | else | |
2524 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2525 | } | |
2526 | ||
3cd715de | 2527 | static void |
bca6c8d0 | 2528 | event_enable_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 SRV |
2540 | edata = *pdata; |
2541 | update_event_probe(edata); | |
3cd715de SRRH |
2542 | } |
2543 | ||
2544 | static void | |
bca6c8d0 | 2545 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 2546 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 2547 | void *data) |
3cd715de | 2548 | { |
6e444319 SRV |
2549 | struct ftrace_func_mapper *mapper = data; |
2550 | struct event_probe_data *edata; | |
41794f19 | 2551 | void **pdata; |
3cd715de | 2552 | |
41794f19 SRV |
2553 | pdata = ftrace_func_mapper_find_ip(mapper, ip); |
2554 | if (!pdata || !*pdata) | |
3cd715de SRRH |
2555 | return; |
2556 | ||
6e444319 | 2557 | edata = *pdata; |
41794f19 | 2558 | |
6e444319 | 2559 | if (!edata->count) |
3cd715de SRRH |
2560 | return; |
2561 | ||
2562 | /* Skip if the event is in a state we want to switch to */ | |
6e444319 | 2563 | if (edata->enable == !(edata->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
3cd715de SRRH |
2564 | return; |
2565 | ||
6e444319 SRV |
2566 | if (edata->count != -1) |
2567 | (edata->count)--; | |
3cd715de | 2568 | |
6e444319 | 2569 | update_event_probe(edata); |
3cd715de SRRH |
2570 | } |
2571 | ||
2572 | static int | |
2573 | event_enable_print(struct seq_file *m, unsigned long ip, | |
6e444319 | 2574 | struct ftrace_probe_ops *ops, void *data) |
3cd715de | 2575 | { |
6e444319 SRV |
2576 | struct ftrace_func_mapper *mapper = data; |
2577 | struct event_probe_data *edata; | |
41794f19 SRV |
2578 | void **pdata; |
2579 | ||
2580 | pdata = ftrace_func_mapper_find_ip(mapper, ip); | |
2581 | ||
2582 | if (WARN_ON_ONCE(!pdata || !*pdata)) | |
2583 | return 0; | |
2584 | ||
6e444319 | 2585 | edata = *pdata; |
3cd715de SRRH |
2586 | |
2587 | seq_printf(m, "%ps:", (void *)ip); | |
2588 | ||
2589 | seq_printf(m, "%s:%s:%s", | |
6e444319 SRV |
2590 | edata->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, |
2591 | edata->file->event_call->class->system, | |
2592 | trace_event_name(edata->file->event_call)); | |
3cd715de | 2593 | |
6e444319 | 2594 | if (edata->count == -1) |
fa6f0cc7 | 2595 | seq_puts(m, ":unlimited\n"); |
3cd715de | 2596 | else |
6e444319 | 2597 | seq_printf(m, ":count=%ld\n", edata->count); |
3cd715de SRRH |
2598 | |
2599 | return 0; | |
2600 | } | |
2601 | ||
2602 | static int | |
b5f081b5 | 2603 | event_enable_init(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 2604 | unsigned long ip, void *init_data, void **data) |
3cd715de | 2605 | { |
6e444319 SRV |
2606 | struct ftrace_func_mapper *mapper = *data; |
2607 | struct event_probe_data *edata = init_data; | |
41794f19 SRV |
2608 | int ret; |
2609 | ||
6e444319 SRV |
2610 | if (!mapper) { |
2611 | mapper = allocate_ftrace_func_mapper(); | |
2612 | if (!mapper) | |
2613 | return -ENODEV; | |
2614 | *data = mapper; | |
2615 | } | |
2616 | ||
2617 | ret = ftrace_func_mapper_add_ip(mapper, ip, edata); | |
41794f19 SRV |
2618 | if (ret < 0) |
2619 | return ret; | |
3cd715de | 2620 | |
6e444319 SRV |
2621 | edata->ref++; |
2622 | ||
2623 | return 0; | |
2624 | } | |
2625 | ||
2626 | static int free_probe_data(void *data) | |
2627 | { | |
2628 | struct event_probe_data *edata = data; | |
41794f19 | 2629 | |
6e444319 SRV |
2630 | edata->ref--; |
2631 | if (!edata->ref) { | |
2632 | /* Remove the SOFT_MODE flag */ | |
2633 | __ftrace_event_enable_disable(edata->file, 0, 1); | |
2634 | module_put(edata->file->event_call->mod); | |
2635 | kfree(edata); | |
2636 | } | |
3cd715de SRRH |
2637 | return 0; |
2638 | } | |
2639 | ||
2640 | static void | |
b5f081b5 | 2641 | event_enable_free(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 2642 | unsigned long ip, void *data) |
3cd715de | 2643 | { |
6e444319 SRV |
2644 | struct ftrace_func_mapper *mapper = data; |
2645 | struct event_probe_data *edata; | |
2646 | ||
2647 | if (!ip) { | |
2648 | if (!mapper) | |
2649 | return; | |
2650 | free_ftrace_func_mapper(mapper, free_probe_data); | |
2651 | return; | |
2652 | } | |
41794f19 | 2653 | |
6e444319 | 2654 | edata = ftrace_func_mapper_remove_ip(mapper, ip); |
41794f19 | 2655 | |
6e444319 | 2656 | if (WARN_ON_ONCE(!edata)) |
41794f19 | 2657 | return; |
3cd715de | 2658 | |
6e444319 | 2659 | if (WARN_ON_ONCE(edata->ref <= 0)) |
3cd715de SRRH |
2660 | return; |
2661 | ||
6e444319 | 2662 | free_probe_data(edata); |
3cd715de SRRH |
2663 | } |
2664 | ||
2665 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2666 | .func = event_enable_probe, | |
2667 | .print = event_enable_print, | |
2668 | .init = event_enable_init, | |
2669 | .free = event_enable_free, | |
2670 | }; | |
2671 | ||
2672 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
2673 | .func = event_enable_count_probe, | |
2674 | .print = event_enable_print, | |
2675 | .init = event_enable_init, | |
2676 | .free = event_enable_free, | |
2677 | }; | |
2678 | ||
2679 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
2680 | .func = event_enable_probe, | |
2681 | .print = event_enable_print, | |
2682 | .init = event_enable_init, | |
2683 | .free = event_enable_free, | |
2684 | }; | |
2685 | ||
2686 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2687 | .func = event_enable_count_probe, | |
2688 | .print = event_enable_print, | |
2689 | .init = event_enable_init, | |
2690 | .free = event_enable_free, | |
2691 | }; | |
2692 | ||
2693 | static int | |
04ec7bb6 | 2694 | event_enable_func(struct trace_array *tr, struct ftrace_hash *hash, |
3cd715de SRRH |
2695 | char *glob, char *cmd, char *param, int enabled) |
2696 | { | |
7f1d2f82 | 2697 | struct trace_event_file *file; |
3cd715de SRRH |
2698 | struct ftrace_probe_ops *ops; |
2699 | struct event_probe_data *data; | |
2700 | const char *system; | |
2701 | const char *event; | |
2702 | char *number; | |
2703 | bool enable; | |
2704 | int ret; | |
2705 | ||
dc81e5e3 YY |
2706 | if (!tr) |
2707 | return -ENODEV; | |
2708 | ||
3cd715de | 2709 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 2710 | if (!enabled || !param) |
3cd715de SRRH |
2711 | return -EINVAL; |
2712 | ||
2713 | system = strsep(¶m, ":"); | |
2714 | if (!param) | |
2715 | return -EINVAL; | |
2716 | ||
2717 | event = strsep(¶m, ":"); | |
2718 | ||
2719 | mutex_lock(&event_mutex); | |
2720 | ||
2721 | ret = -EINVAL; | |
2722 | file = find_event_file(tr, system, event); | |
2723 | if (!file) | |
2724 | goto out; | |
2725 | ||
2726 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2727 | ||
2728 | if (enable) | |
2729 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2730 | else | |
2731 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2732 | ||
2733 | if (glob[0] == '!') { | |
7b60f3d8 | 2734 | ret = unregister_ftrace_function_probe_func(glob+1, tr, ops); |
3cd715de SRRH |
2735 | goto out; |
2736 | } | |
2737 | ||
2738 | ret = -ENOMEM; | |
41794f19 | 2739 | |
3cd715de SRRH |
2740 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
2741 | if (!data) | |
2742 | goto out; | |
2743 | ||
2744 | data->enable = enable; | |
2745 | data->count = -1; | |
2746 | data->file = file; | |
2747 | ||
2748 | if (!param) | |
2749 | goto out_reg; | |
2750 | ||
2751 | number = strsep(¶m, ":"); | |
2752 | ||
2753 | ret = -EINVAL; | |
2754 | if (!strlen(number)) | |
2755 | goto out_free; | |
2756 | ||
2757 | /* | |
2758 | * We use the callback data field (which is a pointer) | |
2759 | * as our counter. | |
2760 | */ | |
2761 | ret = kstrtoul(number, 0, &data->count); | |
2762 | if (ret) | |
2763 | goto out_free; | |
2764 | ||
2765 | out_reg: | |
2766 | /* Don't let event modules unload while probe registered */ | |
2767 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2768 | if (!ret) { |
2769 | ret = -EBUSY; | |
3cd715de | 2770 | goto out_free; |
6ed01066 | 2771 | } |
3cd715de SRRH |
2772 | |
2773 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2774 | if (ret < 0) | |
2775 | goto out_put; | |
41794f19 | 2776 | |
04ec7bb6 | 2777 | ret = register_ftrace_function_probe(glob, tr, ops, data); |
ff305ded SRRH |
2778 | /* |
2779 | * The above returns on success the # of functions enabled, | |
2780 | * but if it didn't find any functions it returns zero. | |
2781 | * Consider no functions a failure too. | |
2782 | */ | |
a5b85bd1 MH |
2783 | if (!ret) { |
2784 | ret = -ENOENT; | |
3cd715de | 2785 | goto out_disable; |
ff305ded SRRH |
2786 | } else if (ret < 0) |
2787 | goto out_disable; | |
2788 | /* Just return zero, not the number of enabled functions */ | |
2789 | ret = 0; | |
3cd715de SRRH |
2790 | out: |
2791 | mutex_unlock(&event_mutex); | |
2792 | return ret; | |
2793 | ||
2794 | out_disable: | |
2795 | __ftrace_event_enable_disable(file, 0, 1); | |
2796 | out_put: | |
2797 | module_put(file->event_call->mod); | |
2798 | out_free: | |
2799 | kfree(data); | |
2800 | goto out; | |
2801 | } | |
2802 | ||
2803 | static struct ftrace_func_command event_enable_cmd = { | |
2804 | .name = ENABLE_EVENT_STR, | |
2805 | .func = event_enable_func, | |
2806 | }; | |
2807 | ||
2808 | static struct ftrace_func_command event_disable_cmd = { | |
2809 | .name = DISABLE_EVENT_STR, | |
2810 | .func = event_enable_func, | |
2811 | }; | |
2812 | ||
2813 | static __init int register_event_cmds(void) | |
2814 | { | |
2815 | int ret; | |
2816 | ||
2817 | ret = register_ftrace_command(&event_enable_cmd); | |
2818 | if (WARN_ON(ret < 0)) | |
2819 | return ret; | |
2820 | ret = register_ftrace_command(&event_disable_cmd); | |
2821 | if (WARN_ON(ret < 0)) | |
2822 | unregister_ftrace_command(&event_enable_cmd); | |
2823 | return ret; | |
2824 | } | |
2825 | #else | |
2826 | static inline int register_event_cmds(void) { return 0; } | |
2827 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2828 | ||
77248221 | 2829 | /* |
7f1d2f82 | 2830 | * The top level array has already had its trace_event_file |
77248221 | 2831 | * descriptors created in order to allow for early events to |
8434dc93 | 2832 | * be recorded. This function is called after the tracefs has been |
77248221 SR |
2833 | * initialized, and we now have to create the files associated |
2834 | * to the events. | |
2835 | */ | |
2836 | static __init void | |
2837 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2838 | { | |
7f1d2f82 | 2839 | struct trace_event_file *file; |
77248221 SR |
2840 | int ret; |
2841 | ||
2842 | ||
2843 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 2844 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 2845 | if (ret < 0) |
3448bac3 | 2846 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2847 | trace_event_name(file->event_call)); |
77248221 SR |
2848 | } |
2849 | } | |
2850 | ||
2851 | /* | |
2852 | * For early boot up, the top trace array requires to have | |
2853 | * a list of events that can be enabled. This must be done before | |
2854 | * the filesystem is set up in order to allow events to be traced | |
2855 | * early. | |
2856 | */ | |
2857 | static __init void | |
2858 | __trace_early_add_events(struct trace_array *tr) | |
2859 | { | |
2425bcb9 | 2860 | struct trace_event_call *call; |
77248221 SR |
2861 | int ret; |
2862 | ||
2863 | list_for_each_entry(call, &ftrace_events, list) { | |
2864 | /* Early boot up should not have any modules loaded */ | |
2865 | if (WARN_ON_ONCE(call->mod)) | |
2866 | continue; | |
2867 | ||
2868 | ret = __trace_early_add_new_event(call, tr); | |
2869 | if (ret < 0) | |
3448bac3 | 2870 | pr_warn("Could not create early event %s\n", |
687fcc4a | 2871 | trace_event_name(call)); |
77248221 SR |
2872 | } |
2873 | } | |
2874 | ||
0c8916c3 SR |
2875 | /* Remove the event directory structure for a trace directory. */ |
2876 | static void | |
2877 | __trace_remove_event_dirs(struct trace_array *tr) | |
2878 | { | |
7f1d2f82 | 2879 | struct trace_event_file *file, *next; |
0c8916c3 | 2880 | |
f6a84bdc ON |
2881 | list_for_each_entry_safe(file, next, &tr->events, list) |
2882 | remove_event_file_dir(file); | |
0c8916c3 SR |
2883 | } |
2884 | ||
2425bcb9 | 2885 | static void __add_event_to_tracers(struct trace_event_call *call) |
ae63b31e SR |
2886 | { |
2887 | struct trace_array *tr; | |
2888 | ||
620a30e9 ON |
2889 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
2890 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
2891 | } |
2892 | ||
2425bcb9 SRRH |
2893 | extern struct trace_event_call *__start_ftrace_events[]; |
2894 | extern struct trace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2895 | |
020e5f85 LZ |
2896 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2897 | ||
2898 | static __init int setup_trace_event(char *str) | |
2899 | { | |
2900 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2901 | ring_buffer_expanded = true; |
2902 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2903 | |
2904 | return 1; | |
2905 | } | |
2906 | __setup("trace_event=", setup_trace_event); | |
2907 | ||
77248221 SR |
2908 | /* Expects to have event_mutex held when called */ |
2909 | static int | |
2910 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2911 | { |
2912 | struct dentry *d_events; | |
2913 | struct dentry *entry; | |
2914 | ||
8434dc93 | 2915 | entry = tracefs_create_file("set_event", 0644, parent, |
ae63b31e SR |
2916 | tr, &ftrace_set_event_fops); |
2917 | if (!entry) { | |
8434dc93 | 2918 | pr_warn("Could not create tracefs 'set_event' entry\n"); |
ae63b31e SR |
2919 | return -ENOMEM; |
2920 | } | |
2921 | ||
8434dc93 | 2922 | d_events = tracefs_create_dir("events", parent); |
277ba044 | 2923 | if (!d_events) { |
8434dc93 | 2924 | pr_warn("Could not create tracefs 'events' directory\n"); |
277ba044 SR |
2925 | return -ENOMEM; |
2926 | } | |
ae63b31e | 2927 | |
7d436400 SRRH |
2928 | entry = trace_create_file("enable", 0644, d_events, |
2929 | tr, &ftrace_tr_enable_fops); | |
2930 | if (!entry) { | |
2931 | pr_warn("Could not create tracefs 'enable' entry\n"); | |
2932 | return -ENOMEM; | |
2933 | } | |
2934 | ||
2935 | /* There are not as crucial, just warn if they are not created */ | |
2936 | ||
49090107 SRRH |
2937 | entry = tracefs_create_file("set_event_pid", 0644, parent, |
2938 | tr, &ftrace_set_event_pid_fops); | |
7d436400 SRRH |
2939 | if (!entry) |
2940 | pr_warn("Could not create tracefs 'set_event_pid' entry\n"); | |
49090107 | 2941 | |
ae63b31e | 2942 | /* ring buffer internal formats */ |
7d436400 SRRH |
2943 | entry = trace_create_file("header_page", 0444, d_events, |
2944 | ring_buffer_print_page_header, | |
2945 | &ftrace_show_header_fops); | |
2946 | if (!entry) | |
2947 | pr_warn("Could not create tracefs 'header_page' entry\n"); | |
2948 | ||
2949 | entry = trace_create_file("header_event", 0444, d_events, | |
2950 | ring_buffer_print_entry_header, | |
2951 | &ftrace_show_header_fops); | |
2952 | if (!entry) | |
2953 | pr_warn("Could not create tracefs 'header_event' entry\n"); | |
ae63b31e SR |
2954 | |
2955 | tr->event_dir = d_events; | |
77248221 SR |
2956 | |
2957 | return 0; | |
2958 | } | |
2959 | ||
2960 | /** | |
2961 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2962 | * @parent: The parent dentry to place the files/directories for events in | |
2963 | * @tr: The trace array associated with these events | |
2964 | * | |
2965 | * When a new instance is created, it needs to set up its events | |
2966 | * directory, as well as other files associated with events. It also | |
2967 | * creates the event hierachry in the @parent/events directory. | |
2968 | * | |
2969 | * Returns 0 on success. | |
12ecef0c SRV |
2970 | * |
2971 | * Must be called with event_mutex held. | |
77248221 SR |
2972 | */ |
2973 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2974 | { | |
2975 | int ret; | |
2976 | ||
12ecef0c | 2977 | lockdep_assert_held(&event_mutex); |
77248221 SR |
2978 | |
2979 | ret = create_event_toplevel_files(parent, tr); | |
2980 | if (ret) | |
12ecef0c | 2981 | goto out; |
77248221 | 2982 | |
52f6ad6d | 2983 | down_write(&trace_event_sem); |
ae63b31e | 2984 | __trace_add_event_dirs(tr); |
52f6ad6d | 2985 | up_write(&trace_event_sem); |
277ba044 | 2986 | |
12ecef0c | 2987 | out: |
77248221 SR |
2988 | return ret; |
2989 | } | |
2990 | ||
2991 | /* | |
2992 | * The top trace array already had its file descriptors created. | |
2993 | * Now the files themselves need to be created. | |
2994 | */ | |
2995 | static __init int | |
2996 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2997 | { | |
2998 | int ret; | |
2999 | ||
3000 | mutex_lock(&event_mutex); | |
3001 | ||
3002 | ret = create_event_toplevel_files(parent, tr); | |
3003 | if (ret) | |
3004 | goto out_unlock; | |
3005 | ||
52f6ad6d | 3006 | down_write(&trace_event_sem); |
77248221 | 3007 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 3008 | up_write(&trace_event_sem); |
77248221 SR |
3009 | |
3010 | out_unlock: | |
3011 | mutex_unlock(&event_mutex); | |
3012 | ||
3013 | return ret; | |
ae63b31e SR |
3014 | } |
3015 | ||
12ecef0c | 3016 | /* Must be called with event_mutex held */ |
0c8916c3 SR |
3017 | int event_trace_del_tracer(struct trace_array *tr) |
3018 | { | |
12ecef0c | 3019 | lockdep_assert_held(&event_mutex); |
0c8916c3 | 3020 | |
85f2b082 TZ |
3021 | /* Disable any event triggers and associated soft-disabled events */ |
3022 | clear_event_triggers(tr); | |
3023 | ||
49090107 SRRH |
3024 | /* Clear the pid list */ |
3025 | __ftrace_clear_event_pids(tr); | |
3026 | ||
2a6c24af SRRH |
3027 | /* Disable any running events */ |
3028 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
3029 | ||
e0a568dc SRV |
3030 | /* Make sure no more events are being executed */ |
3031 | tracepoint_synchronize_unregister(); | |
3ccb0123 | 3032 | |
52f6ad6d | 3033 | down_write(&trace_event_sem); |
0c8916c3 | 3034 | __trace_remove_event_dirs(tr); |
8434dc93 | 3035 | tracefs_remove_recursive(tr->event_dir); |
52f6ad6d | 3036 | up_write(&trace_event_sem); |
0c8916c3 SR |
3037 | |
3038 | tr->event_dir = NULL; | |
3039 | ||
0c8916c3 SR |
3040 | return 0; |
3041 | } | |
3042 | ||
d1a29143 SR |
3043 | static __init int event_trace_memsetup(void) |
3044 | { | |
3045 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
7f1d2f82 | 3046 | file_cachep = KMEM_CACHE(trace_event_file, SLAB_PANIC); |
d1a29143 SR |
3047 | return 0; |
3048 | } | |
3049 | ||
ce1039bd SRRH |
3050 | static __init void |
3051 | early_enable_events(struct trace_array *tr, bool disable_first) | |
3052 | { | |
3053 | char *buf = bootup_event_buf; | |
3054 | char *token; | |
3055 | int ret; | |
3056 | ||
3057 | while (true) { | |
3058 | token = strsep(&buf, ","); | |
3059 | ||
3060 | if (!token) | |
3061 | break; | |
ce1039bd | 3062 | |
43ed3843 SRRH |
3063 | if (*token) { |
3064 | /* Restarting syscalls requires that we stop them first */ | |
3065 | if (disable_first) | |
3066 | ftrace_set_clr_event(tr, token, 0); | |
ce1039bd | 3067 | |
43ed3843 SRRH |
3068 | ret = ftrace_set_clr_event(tr, token, 1); |
3069 | if (ret) | |
3070 | pr_warn("Failed to enable trace event: %s\n", token); | |
3071 | } | |
ce1039bd SRRH |
3072 | |
3073 | /* Put back the comma to allow this to be called again */ | |
3074 | if (buf) | |
3075 | *(buf - 1) = ','; | |
3076 | } | |
3077 | } | |
3078 | ||
8781915a EG |
3079 | static __init int event_trace_enable(void) |
3080 | { | |
ae63b31e | 3081 | struct trace_array *tr = top_trace_array(); |
2425bcb9 | 3082 | struct trace_event_call **iter, *call; |
8781915a EG |
3083 | int ret; |
3084 | ||
dc81e5e3 YY |
3085 | if (!tr) |
3086 | return -ENODEV; | |
3087 | ||
8781915a EG |
3088 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
3089 | ||
3090 | call = *iter; | |
3091 | ret = event_init(call); | |
3092 | if (!ret) | |
3093 | list_add(&call->list, &ftrace_events); | |
3094 | } | |
3095 | ||
77248221 SR |
3096 | /* |
3097 | * We need the top trace array to have a working set of trace | |
3098 | * points at early init, before the debug files and directories | |
3099 | * are created. Create the file entries now, and attach them | |
3100 | * to the actual file dentries later. | |
3101 | */ | |
3102 | __trace_early_add_events(tr); | |
3103 | ||
ce1039bd | 3104 | early_enable_events(tr, false); |
81698831 SR |
3105 | |
3106 | trace_printk_start_comm(); | |
3107 | ||
3cd715de SRRH |
3108 | register_event_cmds(); |
3109 | ||
85f2b082 TZ |
3110 | register_trigger_cmds(); |
3111 | ||
8781915a EG |
3112 | return 0; |
3113 | } | |
3114 | ||
ce1039bd SRRH |
3115 | /* |
3116 | * event_trace_enable() is called from trace_event_init() first to | |
3117 | * initialize events and perhaps start any events that are on the | |
3118 | * command line. Unfortunately, there are some events that will not | |
3119 | * start this early, like the system call tracepoints that need | |
3120 | * to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable() | |
3121 | * is called before pid 1 starts, and this flag is never set, making | |
3122 | * the syscall tracepoint never get reached, but the event is enabled | |
3123 | * regardless (and not doing anything). | |
3124 | */ | |
3125 | static __init int event_trace_enable_again(void) | |
3126 | { | |
3127 | struct trace_array *tr; | |
3128 | ||
3129 | tr = top_trace_array(); | |
3130 | if (!tr) | |
3131 | return -ENODEV; | |
3132 | ||
3133 | early_enable_events(tr, true); | |
3134 | ||
3135 | return 0; | |
3136 | } | |
3137 | ||
3138 | early_initcall(event_trace_enable_again); | |
3139 | ||
58b92547 | 3140 | __init int event_trace_init(void) |
b77e38aa | 3141 | { |
ae63b31e | 3142 | struct trace_array *tr; |
b77e38aa SR |
3143 | struct dentry *d_tracer; |
3144 | struct dentry *entry; | |
6d723736 | 3145 | int ret; |
b77e38aa | 3146 | |
ae63b31e | 3147 | tr = top_trace_array(); |
dc81e5e3 YY |
3148 | if (!tr) |
3149 | return -ENODEV; | |
ae63b31e | 3150 | |
b77e38aa | 3151 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 3152 | if (IS_ERR(d_tracer)) |
b77e38aa SR |
3153 | return 0; |
3154 | ||
8434dc93 | 3155 | entry = tracefs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 3156 | tr, &ftrace_avail_fops); |
2314c4ae | 3157 | if (!entry) |
8434dc93 | 3158 | pr_warn("Could not create tracefs 'available_events' entry\n"); |
2314c4ae | 3159 | |
9f616680 DW |
3160 | if (trace_define_generic_fields()) |
3161 | pr_warn("tracing: Failed to allocated generic fields"); | |
3162 | ||
8728fe50 | 3163 | if (trace_define_common_fields()) |
3448bac3 | 3164 | pr_warn("tracing: Failed to allocate common fields"); |
8728fe50 | 3165 | |
77248221 | 3166 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
3167 | if (ret) |
3168 | return ret; | |
020e5f85 | 3169 | |
836d481e | 3170 | #ifdef CONFIG_MODULES |
6d723736 | 3171 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 3172 | if (ret) |
3448bac3 | 3173 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 3174 | #endif |
b77e38aa SR |
3175 | return 0; |
3176 | } | |
5f893b26 SRRH |
3177 | |
3178 | void __init trace_event_init(void) | |
3179 | { | |
3180 | event_trace_memsetup(); | |
3181 | init_ftrace_syscalls(); | |
3182 | event_trace_enable(); | |
3183 | } | |
3184 | ||
b3015fe4 | 3185 | #ifdef CONFIG_EVENT_TRACE_STARTUP_TEST |
e6187007 SR |
3186 | |
3187 | static DEFINE_SPINLOCK(test_spinlock); | |
3188 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
3189 | static DEFINE_MUTEX(test_mutex); | |
3190 | ||
3191 | static __init void test_work(struct work_struct *dummy) | |
3192 | { | |
3193 | spin_lock(&test_spinlock); | |
3194 | spin_lock_irq(&test_spinlock_irq); | |
3195 | udelay(1); | |
3196 | spin_unlock_irq(&test_spinlock_irq); | |
3197 | spin_unlock(&test_spinlock); | |
3198 | ||
3199 | mutex_lock(&test_mutex); | |
3200 | msleep(1); | |
3201 | mutex_unlock(&test_mutex); | |
3202 | } | |
3203 | ||
3204 | static __init int event_test_thread(void *unused) | |
3205 | { | |
3206 | void *test_malloc; | |
3207 | ||
3208 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
3209 | if (!test_malloc) | |
3210 | pr_info("failed to kmalloc\n"); | |
3211 | ||
3212 | schedule_on_each_cpu(test_work); | |
3213 | ||
3214 | kfree(test_malloc); | |
3215 | ||
3216 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 3217 | while (!kthread_should_stop()) { |
e6187007 | 3218 | schedule(); |
fe0e01c7 PZ |
3219 | set_current_state(TASK_INTERRUPTIBLE); |
3220 | } | |
3221 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
3222 | |
3223 | return 0; | |
3224 | } | |
3225 | ||
3226 | /* | |
3227 | * Do various things that may trigger events. | |
3228 | */ | |
3229 | static __init void event_test_stuff(void) | |
3230 | { | |
3231 | struct task_struct *test_thread; | |
3232 | ||
3233 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
3234 | msleep(1); | |
3235 | kthread_stop(test_thread); | |
3236 | } | |
3237 | ||
3238 | /* | |
3239 | * For every trace event defined, we will test each trace point separately, | |
3240 | * and then by groups, and finally all trace points. | |
3241 | */ | |
9ea21c1e | 3242 | static __init void event_trace_self_tests(void) |
e6187007 | 3243 | { |
7967b3e0 | 3244 | struct trace_subsystem_dir *dir; |
7f1d2f82 | 3245 | struct trace_event_file *file; |
2425bcb9 | 3246 | struct trace_event_call *call; |
e6187007 | 3247 | struct event_subsystem *system; |
ae63b31e | 3248 | struct trace_array *tr; |
e6187007 SR |
3249 | int ret; |
3250 | ||
ae63b31e | 3251 | tr = top_trace_array(); |
dc81e5e3 YY |
3252 | if (!tr) |
3253 | return; | |
ae63b31e | 3254 | |
e6187007 SR |
3255 | pr_info("Running tests on trace events:\n"); |
3256 | ||
ae63b31e SR |
3257 | list_for_each_entry(file, &tr->events, list) { |
3258 | ||
3259 | call = file->event_call; | |
e6187007 | 3260 | |
2239291a SR |
3261 | /* Only test those that have a probe */ |
3262 | if (!call->class || !call->class->probe) | |
e6187007 SR |
3263 | continue; |
3264 | ||
1f5a6b45 SR |
3265 | /* |
3266 | * Testing syscall events here is pretty useless, but | |
3267 | * we still do it if configured. But this is time consuming. | |
3268 | * What we really need is a user thread to perform the | |
3269 | * syscalls as we test. | |
3270 | */ | |
3271 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
3272 | if (call->class->system && |
3273 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
3274 | continue; |
3275 | #endif | |
3276 | ||
687fcc4a | 3277 | pr_info("Testing event %s: ", trace_event_name(call)); |
e6187007 SR |
3278 | |
3279 | /* | |
3280 | * If an event is already enabled, someone is using | |
3281 | * it and the self test should not be on. | |
3282 | */ | |
5d6ad960 | 3283 | if (file->flags & EVENT_FILE_FL_ENABLED) { |
3448bac3 | 3284 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
3285 | WARN_ON_ONCE(1); |
3286 | continue; | |
3287 | } | |
3288 | ||
ae63b31e | 3289 | ftrace_event_enable_disable(file, 1); |
e6187007 | 3290 | event_test_stuff(); |
ae63b31e | 3291 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
3292 | |
3293 | pr_cont("OK\n"); | |
3294 | } | |
3295 | ||
3296 | /* Now test at the sub system level */ | |
3297 | ||
3298 | pr_info("Running tests on trace event systems:\n"); | |
3299 | ||
ae63b31e SR |
3300 | list_for_each_entry(dir, &tr->systems, list) { |
3301 | ||
3302 | system = dir->subsystem; | |
e6187007 SR |
3303 | |
3304 | /* the ftrace system is special, skip it */ | |
3305 | if (strcmp(system->name, "ftrace") == 0) | |
3306 | continue; | |
3307 | ||
3308 | pr_info("Testing event system %s: ", system->name); | |
3309 | ||
ae63b31e | 3310 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 3311 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3312 | pr_warn("error enabling system %s\n", |
3313 | system->name); | |
e6187007 SR |
3314 | continue; |
3315 | } | |
3316 | ||
3317 | event_test_stuff(); | |
3318 | ||
ae63b31e | 3319 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 3320 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3321 | pr_warn("error disabling system %s\n", |
3322 | system->name); | |
76bab1b7 YL |
3323 | continue; |
3324 | } | |
e6187007 SR |
3325 | |
3326 | pr_cont("OK\n"); | |
3327 | } | |
3328 | ||
3329 | /* Test with all events enabled */ | |
3330 | ||
3331 | pr_info("Running tests on all trace events:\n"); | |
3332 | pr_info("Testing all events: "); | |
3333 | ||
ae63b31e | 3334 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 3335 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3336 | pr_warn("error enabling all events\n"); |
9ea21c1e | 3337 | return; |
e6187007 SR |
3338 | } |
3339 | ||
3340 | event_test_stuff(); | |
3341 | ||
3342 | /* reset sysname */ | |
ae63b31e | 3343 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 3344 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3345 | pr_warn("error disabling all events\n"); |
9ea21c1e | 3346 | return; |
e6187007 SR |
3347 | } |
3348 | ||
3349 | pr_cont("OK\n"); | |
9ea21c1e SR |
3350 | } |
3351 | ||
3352 | #ifdef CONFIG_FUNCTION_TRACER | |
3353 | ||
245b2e70 | 3354 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e | 3355 | |
9b9db275 | 3356 | static struct trace_event_file event_trace_file __initdata; |
b7f0c959 SRRH |
3357 | |
3358 | static void __init | |
2f5f6ad9 | 3359 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 3360 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
3361 | { |
3362 | struct ring_buffer_event *event; | |
e77405ad | 3363 | struct ring_buffer *buffer; |
9ea21c1e SR |
3364 | struct ftrace_entry *entry; |
3365 | unsigned long flags; | |
3366 | long disabled; | |
9ea21c1e SR |
3367 | int cpu; |
3368 | int pc; | |
3369 | ||
3370 | pc = preempt_count(); | |
5168ae50 | 3371 | preempt_disable_notrace(); |
9ea21c1e | 3372 | cpu = raw_smp_processor_id(); |
245b2e70 | 3373 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
3374 | |
3375 | if (disabled != 1) | |
3376 | goto out; | |
3377 | ||
3378 | local_save_flags(flags); | |
3379 | ||
9b9db275 SRRH |
3380 | event = trace_event_buffer_lock_reserve(&buffer, &event_trace_file, |
3381 | TRACE_FN, sizeof(*entry), | |
3382 | flags, pc); | |
9ea21c1e SR |
3383 | if (!event) |
3384 | goto out; | |
3385 | entry = ring_buffer_event_data(event); | |
3386 | entry->ip = ip; | |
3387 | entry->parent_ip = parent_ip; | |
3388 | ||
9b9db275 SRRH |
3389 | event_trigger_unlock_commit(&event_trace_file, buffer, event, |
3390 | entry, flags, pc); | |
9ea21c1e | 3391 | out: |
245b2e70 | 3392 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 3393 | preempt_enable_notrace(); |
9ea21c1e SR |
3394 | } |
3395 | ||
3396 | static struct ftrace_ops trace_ops __initdata = | |
3397 | { | |
3398 | .func = function_test_events_call, | |
4740974a | 3399 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
3400 | }; |
3401 | ||
3402 | static __init void event_trace_self_test_with_function(void) | |
3403 | { | |
17bb615a | 3404 | int ret; |
9b9db275 SRRH |
3405 | |
3406 | event_trace_file.tr = top_trace_array(); | |
3407 | if (WARN_ON(!event_trace_file.tr)) | |
2d34f489 | 3408 | return; |
9b9db275 | 3409 | |
17bb615a SR |
3410 | ret = register_ftrace_function(&trace_ops); |
3411 | if (WARN_ON(ret < 0)) { | |
3412 | pr_info("Failed to enable function tracer for event tests\n"); | |
3413 | return; | |
3414 | } | |
9ea21c1e SR |
3415 | pr_info("Running tests again, along with the function tracer\n"); |
3416 | event_trace_self_tests(); | |
3417 | unregister_ftrace_function(&trace_ops); | |
3418 | } | |
3419 | #else | |
3420 | static __init void event_trace_self_test_with_function(void) | |
3421 | { | |
3422 | } | |
3423 | #endif | |
3424 | ||
3425 | static __init int event_trace_self_tests_init(void) | |
3426 | { | |
020e5f85 LZ |
3427 | if (!tracing_selftest_disabled) { |
3428 | event_trace_self_tests(); | |
3429 | event_trace_self_test_with_function(); | |
3430 | } | |
e6187007 SR |
3431 | |
3432 | return 0; | |
3433 | } | |
3434 | ||
28d20e2d | 3435 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
3436 | |
3437 | #endif |