Commit | Line | Data |
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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 | 14 | #include <linux/workqueue.h> |
17911ff3 | 15 | #include <linux/security.h> |
e6187007 SR |
16 | #include <linux/spinlock.h> |
17 | #include <linux/kthread.h> | |
8434dc93 | 18 | #include <linux/tracefs.h> |
b77e38aa SR |
19 | #include <linux/uaccess.h> |
20 | #include <linux/module.h> | |
21 | #include <linux/ctype.h> | |
49090107 | 22 | #include <linux/sort.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
e6187007 | 24 | #include <linux/delay.h> |
b77e38aa | 25 | |
3fdaf80f SRRH |
26 | #include <trace/events/sched.h> |
27 | ||
020e5f85 LZ |
28 | #include <asm/setup.h> |
29 | ||
91729ef9 | 30 | #include "trace_output.h" |
b77e38aa | 31 | |
4e5292ea | 32 | #undef TRACE_SYSTEM |
b628b3e6 SR |
33 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
34 | ||
20c8928a | 35 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 36 | |
a59fd602 | 37 | LIST_HEAD(ftrace_events); |
9f616680 | 38 | static LIST_HEAD(ftrace_generic_fields); |
b3a8c6fd | 39 | static LIST_HEAD(ftrace_common_fields); |
a59fd602 | 40 | |
d1a29143 SR |
41 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
42 | ||
43 | static struct kmem_cache *field_cachep; | |
44 | static struct kmem_cache *file_cachep; | |
45 | ||
6e94a780 SR |
46 | static inline int system_refcount(struct event_subsystem *system) |
47 | { | |
79ac6ef5 | 48 | return system->ref_count; |
6e94a780 SR |
49 | } |
50 | ||
51 | static int system_refcount_inc(struct event_subsystem *system) | |
52 | { | |
79ac6ef5 | 53 | return system->ref_count++; |
6e94a780 SR |
54 | } |
55 | ||
56 | static int system_refcount_dec(struct event_subsystem *system) | |
57 | { | |
79ac6ef5 | 58 | return --system->ref_count; |
6e94a780 SR |
59 | } |
60 | ||
ae63b31e SR |
61 | /* Double loops, do not use break, only goto's work */ |
62 | #define do_for_each_event_file(tr, file) \ | |
63 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
64 | list_for_each_entry(file, &tr->events, list) | |
65 | ||
66 | #define do_for_each_event_file_safe(tr, file) \ | |
67 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
7f1d2f82 | 68 | struct trace_event_file *___n; \ |
ae63b31e SR |
69 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
70 | ||
71 | #define while_for_each_event_file() \ | |
72 | } | |
73 | ||
b3a8c6fd J |
74 | static struct ftrace_event_field * |
75 | __find_event_field(struct list_head *head, char *name) | |
76 | { | |
77 | struct ftrace_event_field *field; | |
78 | ||
79 | list_for_each_entry(field, head, link) { | |
80 | if (!strcmp(field->name, name)) | |
81 | return field; | |
82 | } | |
83 | ||
84 | return NULL; | |
85 | } | |
86 | ||
87 | struct ftrace_event_field * | |
2425bcb9 | 88 | trace_find_event_field(struct trace_event_call *call, char *name) |
b3a8c6fd J |
89 | { |
90 | struct ftrace_event_field *field; | |
91 | struct list_head *head; | |
92 | ||
e57cbaf0 SRRH |
93 | head = trace_get_fields(call); |
94 | field = __find_event_field(head, name); | |
9f616680 DW |
95 | if (field) |
96 | return field; | |
97 | ||
e57cbaf0 | 98 | field = __find_event_field(&ftrace_generic_fields, name); |
b3a8c6fd J |
99 | if (field) |
100 | return field; | |
101 | ||
e57cbaf0 | 102 | return __find_event_field(&ftrace_common_fields, name); |
b3a8c6fd J |
103 | } |
104 | ||
8728fe50 LZ |
105 | static int __trace_define_field(struct list_head *head, const char *type, |
106 | const char *name, int offset, int size, | |
107 | int is_signed, int filter_type) | |
cf027f64 TZ |
108 | { |
109 | struct ftrace_event_field *field; | |
110 | ||
d1a29143 | 111 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 112 | if (!field) |
aaf6ac0f | 113 | return -ENOMEM; |
fe9f57f2 | 114 | |
92edca07 SR |
115 | field->name = name; |
116 | field->type = type; | |
fe9f57f2 | 117 | |
43b51ead LZ |
118 | if (filter_type == FILTER_OTHER) |
119 | field->filter_type = filter_assign_type(type); | |
120 | else | |
121 | field->filter_type = filter_type; | |
122 | ||
cf027f64 TZ |
123 | field->offset = offset; |
124 | field->size = size; | |
a118e4d1 | 125 | field->is_signed = is_signed; |
aa38e9fc | 126 | |
2e33af02 | 127 | list_add(&field->link, head); |
cf027f64 TZ |
128 | |
129 | return 0; | |
cf027f64 | 130 | } |
8728fe50 | 131 | |
2425bcb9 | 132 | int trace_define_field(struct trace_event_call *call, const char *type, |
8728fe50 LZ |
133 | const char *name, int offset, int size, int is_signed, |
134 | int filter_type) | |
135 | { | |
136 | struct list_head *head; | |
137 | ||
138 | if (WARN_ON(!call->class)) | |
139 | return 0; | |
140 | ||
141 | head = trace_get_fields(call); | |
142 | return __trace_define_field(head, type, name, offset, size, | |
143 | is_signed, filter_type); | |
144 | } | |
17c873ec | 145 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 146 | |
9f616680 DW |
147 | #define __generic_field(type, item, filter_type) \ |
148 | ret = __trace_define_field(&ftrace_generic_fields, #type, \ | |
149 | #item, 0, 0, is_signed_type(type), \ | |
150 | filter_type); \ | |
151 | if (ret) \ | |
152 | return ret; | |
153 | ||
e647d6b3 | 154 | #define __common_field(type, item) \ |
8728fe50 LZ |
155 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
156 | "common_" #item, \ | |
157 | offsetof(typeof(ent), item), \ | |
158 | sizeof(ent.item), \ | |
159 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
160 | if (ret) \ |
161 | return ret; | |
162 | ||
9f616680 DW |
163 | static int trace_define_generic_fields(void) |
164 | { | |
165 | int ret; | |
166 | ||
e57cbaf0 SRRH |
167 | __generic_field(int, CPU, FILTER_CPU); |
168 | __generic_field(int, cpu, FILTER_CPU); | |
169 | __generic_field(char *, COMM, FILTER_COMM); | |
170 | __generic_field(char *, comm, FILTER_COMM); | |
9f616680 DW |
171 | |
172 | return ret; | |
173 | } | |
174 | ||
8728fe50 | 175 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
176 | { |
177 | int ret; | |
178 | struct trace_entry ent; | |
179 | ||
180 | __common_field(unsigned short, type); | |
181 | __common_field(unsigned char, flags); | |
182 | __common_field(unsigned char, preempt_count); | |
183 | __common_field(int, pid); | |
e647d6b3 LZ |
184 | |
185 | return ret; | |
186 | } | |
187 | ||
2425bcb9 | 188 | static void trace_destroy_fields(struct trace_event_call *call) |
2df75e41 LZ |
189 | { |
190 | struct ftrace_event_field *field, *next; | |
2e33af02 | 191 | struct list_head *head; |
2df75e41 | 192 | |
2e33af02 SR |
193 | head = trace_get_fields(call); |
194 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 195 | list_del(&field->link); |
d1a29143 | 196 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
197 | } |
198 | } | |
199 | ||
32bbe007 AS |
200 | /* |
201 | * run-time version of trace_event_get_offsets_<call>() that returns the last | |
202 | * accessible offset of trace fields excluding __dynamic_array bytes | |
203 | */ | |
204 | int trace_event_get_offsets(struct trace_event_call *call) | |
205 | { | |
206 | struct ftrace_event_field *tail; | |
207 | struct list_head *head; | |
208 | ||
209 | head = trace_get_fields(call); | |
210 | /* | |
211 | * head->next points to the last field with the largest offset, | |
212 | * since it was added last by trace_define_field() | |
213 | */ | |
214 | tail = list_first_entry(head, struct ftrace_event_field, link); | |
215 | return tail->offset + tail->size; | |
216 | } | |
217 | ||
2425bcb9 | 218 | int trace_event_raw_init(struct trace_event_call *call) |
87d9b4e1 LZ |
219 | { |
220 | int id; | |
221 | ||
9023c930 | 222 | id = register_trace_event(&call->event); |
87d9b4e1 LZ |
223 | if (!id) |
224 | return -ENODEV; | |
87d9b4e1 LZ |
225 | |
226 | return 0; | |
227 | } | |
228 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
229 | ||
3fdaf80f SRRH |
230 | bool trace_event_ignore_this_pid(struct trace_event_file *trace_file) |
231 | { | |
232 | struct trace_array *tr = trace_file->tr; | |
233 | struct trace_array_cpu *data; | |
234 | struct trace_pid_list *pid_list; | |
235 | ||
da25a672 | 236 | pid_list = rcu_dereference_raw(tr->filtered_pids); |
3fdaf80f SRRH |
237 | if (!pid_list) |
238 | return false; | |
239 | ||
240 | data = this_cpu_ptr(tr->trace_buffer.data); | |
241 | ||
242 | return data->ignore_pid; | |
243 | } | |
244 | EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid); | |
245 | ||
3f795dcf SRRH |
246 | void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, |
247 | struct trace_event_file *trace_file, | |
248 | unsigned long len) | |
3fd40d1e | 249 | { |
2425bcb9 | 250 | struct trace_event_call *event_call = trace_file->event_call; |
3fd40d1e | 251 | |
3fdaf80f SRRH |
252 | if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) && |
253 | trace_event_ignore_this_pid(trace_file)) | |
254 | return NULL; | |
255 | ||
3fd40d1e SR |
256 | local_save_flags(fbuffer->flags); |
257 | fbuffer->pc = preempt_count(); | |
e947841c | 258 | /* |
30c93704 | 259 | * If CONFIG_PREEMPTION is enabled, then the tracepoint itself disables |
e947841c SRRH |
260 | * preemption (adding one to the preempt_count). Since we are |
261 | * interested in the preempt_count at the time the tracepoint was | |
262 | * hit, we need to subtract one to offset the increment. | |
263 | */ | |
30c93704 | 264 | if (IS_ENABLED(CONFIG_PREEMPTION)) |
e947841c | 265 | fbuffer->pc--; |
7f1d2f82 | 266 | fbuffer->trace_file = trace_file; |
3fd40d1e SR |
267 | |
268 | fbuffer->event = | |
7f1d2f82 | 269 | trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, |
3fd40d1e SR |
270 | event_call->event.type, len, |
271 | fbuffer->flags, fbuffer->pc); | |
272 | if (!fbuffer->event) | |
273 | return NULL; | |
274 | ||
275 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); | |
276 | return fbuffer->entry; | |
277 | } | |
3f795dcf | 278 | EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); |
3fd40d1e | 279 | |
2425bcb9 | 280 | int trace_event_reg(struct trace_event_call *call, |
9023c930 | 281 | enum trace_reg type, void *data) |
a1d0ce82 | 282 | { |
7f1d2f82 | 283 | struct trace_event_file *file = data; |
ae63b31e | 284 | |
de7b2973 | 285 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
a1d0ce82 SR |
286 | switch (type) { |
287 | case TRACE_REG_REGISTER: | |
de7b2973 | 288 | return tracepoint_probe_register(call->tp, |
a1d0ce82 | 289 | call->class->probe, |
ae63b31e | 290 | file); |
a1d0ce82 | 291 | case TRACE_REG_UNREGISTER: |
de7b2973 | 292 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 | 293 | call->class->probe, |
ae63b31e | 294 | file); |
a1d0ce82 SR |
295 | return 0; |
296 | ||
297 | #ifdef CONFIG_PERF_EVENTS | |
298 | case TRACE_REG_PERF_REGISTER: | |
de7b2973 | 299 | return tracepoint_probe_register(call->tp, |
a1d0ce82 SR |
300 | call->class->perf_probe, |
301 | call); | |
302 | case TRACE_REG_PERF_UNREGISTER: | |
de7b2973 | 303 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 SR |
304 | call->class->perf_probe, |
305 | call); | |
306 | return 0; | |
ceec0b6f JO |
307 | case TRACE_REG_PERF_OPEN: |
308 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
309 | case TRACE_REG_PERF_ADD: |
310 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 311 | return 0; |
a1d0ce82 SR |
312 | #endif |
313 | } | |
314 | return 0; | |
315 | } | |
9023c930 | 316 | EXPORT_SYMBOL_GPL(trace_event_reg); |
a1d0ce82 | 317 | |
e870e9a1 LZ |
318 | void trace_event_enable_cmd_record(bool enable) |
319 | { | |
7f1d2f82 | 320 | struct trace_event_file *file; |
ae63b31e | 321 | struct trace_array *tr; |
e870e9a1 LZ |
322 | |
323 | mutex_lock(&event_mutex); | |
ae63b31e SR |
324 | do_for_each_event_file(tr, file) { |
325 | ||
5d6ad960 | 326 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) |
e870e9a1 LZ |
327 | continue; |
328 | ||
329 | if (enable) { | |
330 | tracing_start_cmdline_record(); | |
5d6ad960 | 331 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
332 | } else { |
333 | tracing_stop_cmdline_record(); | |
5d6ad960 | 334 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 335 | } |
ae63b31e | 336 | } while_for_each_event_file(); |
e870e9a1 LZ |
337 | mutex_unlock(&event_mutex); |
338 | } | |
339 | ||
d914ba37 JF |
340 | void trace_event_enable_tgid_record(bool enable) |
341 | { | |
342 | struct trace_event_file *file; | |
343 | struct trace_array *tr; | |
344 | ||
345 | mutex_lock(&event_mutex); | |
346 | do_for_each_event_file(tr, file) { | |
347 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) | |
348 | continue; | |
349 | ||
350 | if (enable) { | |
351 | tracing_start_tgid_record(); | |
352 | set_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); | |
353 | } else { | |
354 | tracing_stop_tgid_record(); | |
355 | clear_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, | |
356 | &file->flags); | |
357 | } | |
358 | } while_for_each_event_file(); | |
359 | mutex_unlock(&event_mutex); | |
360 | } | |
361 | ||
7f1d2f82 | 362 | static int __ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 | 363 | int enable, int soft_disable) |
fd994989 | 364 | { |
2425bcb9 | 365 | struct trace_event_call *call = file->event_call; |
983f938a | 366 | struct trace_array *tr = file->tr; |
0fc1b09f | 367 | unsigned long file_flags = file->flags; |
3b8e4273 | 368 | int ret = 0; |
417944c4 | 369 | int disable; |
3b8e4273 | 370 | |
fd994989 SR |
371 | switch (enable) { |
372 | case 0: | |
417944c4 | 373 | /* |
1cf4c073 MH |
374 | * When soft_disable is set and enable is cleared, the sm_ref |
375 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
376 | * to clear the SOFT_DISABLED flag but leave the event in the |
377 | * state that it was. That is, if the event was enabled and | |
378 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
379 | * is set we do not want the event to be enabled before we | |
380 | * clear the bit. | |
381 | * | |
382 | * When soft_disable is not set but the SOFT_MODE flag is, | |
383 | * we do nothing. Do not disable the tracepoint, otherwise | |
384 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
385 | */ | |
386 | if (soft_disable) { | |
1cf4c073 MH |
387 | if (atomic_dec_return(&file->sm_ref) > 0) |
388 | break; | |
5d6ad960 SRRH |
389 | disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; |
390 | clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); | |
417944c4 | 391 | } else |
5d6ad960 | 392 | disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); |
417944c4 | 393 | |
5d6ad960 SRRH |
394 | if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { |
395 | clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); | |
396 | if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { | |
e870e9a1 | 397 | tracing_stop_cmdline_record(); |
5d6ad960 | 398 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 399 | } |
d914ba37 JF |
400 | |
401 | if (file->flags & EVENT_FILE_FL_RECORDED_TGID) { | |
402 | tracing_stop_tgid_record(); | |
7685ab6c | 403 | clear_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); |
d914ba37 JF |
404 | } |
405 | ||
ae63b31e | 406 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 407 | } |
3baa5e4c | 408 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
5d6ad960 SRRH |
409 | if (file->flags & EVENT_FILE_FL_SOFT_MODE) |
410 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c | 411 | else |
5d6ad960 | 412 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
fd994989 SR |
413 | break; |
414 | case 1: | |
417944c4 SRRH |
415 | /* |
416 | * When soft_disable is set and enable is set, we want to | |
417 | * register the tracepoint for the event, but leave the event | |
418 | * as is. That means, if the event was already enabled, we do | |
419 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
420 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
421 | * it still seems to be disabled. | |
422 | */ | |
423 | if (!soft_disable) | |
5d6ad960 | 424 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
1cf4c073 MH |
425 | else { |
426 | if (atomic_inc_return(&file->sm_ref) > 1) | |
427 | break; | |
5d6ad960 | 428 | set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 429 | } |
417944c4 | 430 | |
5d6ad960 | 431 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) { |
d914ba37 | 432 | bool cmd = false, tgid = false; |
417944c4 SRRH |
433 | |
434 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
435 | if (soft_disable) | |
5d6ad960 | 436 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
417944c4 | 437 | |
983f938a | 438 | if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { |
d914ba37 | 439 | cmd = true; |
e870e9a1 | 440 | tracing_start_cmdline_record(); |
5d6ad960 | 441 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 442 | } |
d914ba37 JF |
443 | |
444 | if (tr->trace_flags & TRACE_ITER_RECORD_TGID) { | |
445 | tgid = true; | |
446 | tracing_start_tgid_record(); | |
447 | set_bit(EVENT_FILE_FL_RECORDED_TGID_BIT, &file->flags); | |
448 | } | |
449 | ||
ae63b31e | 450 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 | 451 | if (ret) { |
d914ba37 JF |
452 | if (cmd) |
453 | tracing_stop_cmdline_record(); | |
454 | if (tgid) | |
455 | tracing_stop_tgid_record(); | |
3b8e4273 | 456 | pr_info("event trace: Could not enable event " |
687fcc4a | 457 | "%s\n", trace_event_name(call)); |
3b8e4273 LZ |
458 | break; |
459 | } | |
5d6ad960 | 460 | set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
461 | |
462 | /* WAS_ENABLED gets set but never cleared. */ | |
065e63f9 | 463 | set_bit(EVENT_FILE_FL_WAS_ENABLED_BIT, &file->flags); |
fd994989 | 464 | } |
fd994989 SR |
465 | break; |
466 | } | |
3b8e4273 | 467 | |
0fc1b09f SRRH |
468 | /* Enable or disable use of trace_buffered_event */ |
469 | if ((file_flags & EVENT_FILE_FL_SOFT_DISABLED) != | |
470 | (file->flags & EVENT_FILE_FL_SOFT_DISABLED)) { | |
471 | if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) | |
472 | trace_buffered_event_enable(); | |
473 | else | |
474 | trace_buffered_event_disable(); | |
475 | } | |
476 | ||
3b8e4273 | 477 | return ret; |
fd994989 SR |
478 | } |
479 | ||
7f1d2f82 | 480 | int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 TZ |
481 | int enable, int soft_disable) |
482 | { | |
483 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
484 | } | |
485 | ||
7f1d2f82 | 486 | static int ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 SRRH |
487 | int enable) |
488 | { | |
489 | return __ftrace_event_enable_disable(file, enable, 0); | |
490 | } | |
491 | ||
ae63b31e | 492 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 493 | { |
7f1d2f82 | 494 | struct trace_event_file *file; |
0e907c99 Z |
495 | |
496 | mutex_lock(&event_mutex); | |
ae63b31e SR |
497 | list_for_each_entry(file, &tr->events, list) { |
498 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
499 | } |
500 | mutex_unlock(&event_mutex); | |
501 | } | |
502 | ||
c37775d5 SR |
503 | static void |
504 | event_filter_pid_sched_process_exit(void *data, struct task_struct *task) | |
505 | { | |
506 | struct trace_pid_list *pid_list; | |
507 | struct trace_array *tr = data; | |
508 | ||
da25a672 | 509 | pid_list = rcu_dereference_raw(tr->filtered_pids); |
4e267db1 | 510 | trace_filter_add_remove_task(pid_list, NULL, task); |
c37775d5 SR |
511 | } |
512 | ||
513 | static void | |
514 | event_filter_pid_sched_process_fork(void *data, | |
515 | struct task_struct *self, | |
516 | struct task_struct *task) | |
517 | { | |
518 | struct trace_pid_list *pid_list; | |
519 | struct trace_array *tr = data; | |
520 | ||
521 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
4e267db1 | 522 | trace_filter_add_remove_task(pid_list, self, task); |
c37775d5 SR |
523 | } |
524 | ||
525 | void trace_event_follow_fork(struct trace_array *tr, bool enable) | |
526 | { | |
527 | if (enable) { | |
528 | register_trace_prio_sched_process_fork(event_filter_pid_sched_process_fork, | |
529 | tr, INT_MIN); | |
530 | register_trace_prio_sched_process_exit(event_filter_pid_sched_process_exit, | |
531 | tr, INT_MAX); | |
532 | } else { | |
533 | unregister_trace_sched_process_fork(event_filter_pid_sched_process_fork, | |
534 | tr); | |
535 | unregister_trace_sched_process_exit(event_filter_pid_sched_process_exit, | |
536 | tr); | |
537 | } | |
3fdaf80f SRRH |
538 | } |
539 | ||
540 | static void | |
22402cd0 | 541 | event_filter_pid_sched_switch_probe_pre(void *data, bool preempt, |
3fdaf80f SRRH |
542 | struct task_struct *prev, struct task_struct *next) |
543 | { | |
544 | struct trace_array *tr = data; | |
545 | struct trace_pid_list *pid_list; | |
546 | ||
547 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
548 | ||
549 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 SR |
550 | trace_ignore_this_task(pid_list, prev) && |
551 | trace_ignore_this_task(pid_list, next)); | |
3fdaf80f SRRH |
552 | } |
553 | ||
554 | static void | |
22402cd0 | 555 | event_filter_pid_sched_switch_probe_post(void *data, bool preempt, |
3fdaf80f SRRH |
556 | struct task_struct *prev, struct task_struct *next) |
557 | { | |
558 | struct trace_array *tr = data; | |
559 | struct trace_pid_list *pid_list; | |
560 | ||
561 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
562 | ||
563 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 564 | trace_ignore_this_task(pid_list, next)); |
3fdaf80f SRRH |
565 | } |
566 | ||
567 | static void | |
568 | event_filter_pid_sched_wakeup_probe_pre(void *data, struct task_struct *task) | |
569 | { | |
570 | struct trace_array *tr = data; | |
571 | struct trace_pid_list *pid_list; | |
572 | ||
573 | /* Nothing to do if we are already tracing */ | |
574 | if (!this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
575 | return; | |
576 | ||
577 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
578 | ||
579 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 580 | trace_ignore_this_task(pid_list, task)); |
3fdaf80f SRRH |
581 | } |
582 | ||
583 | static void | |
584 | event_filter_pid_sched_wakeup_probe_post(void *data, struct task_struct *task) | |
585 | { | |
586 | struct trace_array *tr = data; | |
587 | struct trace_pid_list *pid_list; | |
588 | ||
589 | /* Nothing to do if we are not tracing */ | |
590 | if (this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
591 | return; | |
592 | ||
593 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
594 | ||
595 | /* Set tracing if current is enabled */ | |
596 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 597 | trace_ignore_this_task(pid_list, current)); |
3fdaf80f SRRH |
598 | } |
599 | ||
49090107 SRRH |
600 | static void __ftrace_clear_event_pids(struct trace_array *tr) |
601 | { | |
602 | struct trace_pid_list *pid_list; | |
3fdaf80f SRRH |
603 | struct trace_event_file *file; |
604 | int cpu; | |
49090107 SRRH |
605 | |
606 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
607 | lockdep_is_held(&event_mutex)); | |
608 | if (!pid_list) | |
609 | return; | |
610 | ||
3fdaf80f SRRH |
611 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_pre, tr); |
612 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_post, tr); | |
613 | ||
614 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, tr); | |
615 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, tr); | |
616 | ||
0f72e37e SRRH |
617 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, tr); |
618 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, tr); | |
619 | ||
620 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_pre, tr); | |
621 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_post, tr); | |
622 | ||
3fdaf80f SRRH |
623 | list_for_each_entry(file, &tr->events, list) { |
624 | clear_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
625 | } | |
626 | ||
627 | for_each_possible_cpu(cpu) | |
628 | per_cpu_ptr(tr->trace_buffer.data, cpu)->ignore_pid = false; | |
629 | ||
49090107 SRRH |
630 | rcu_assign_pointer(tr->filtered_pids, NULL); |
631 | ||
632 | /* Wait till all users are no longer using pid filtering */ | |
e0a568dc | 633 | tracepoint_synchronize_unregister(); |
49090107 | 634 | |
76c813e2 | 635 | trace_free_pid_list(pid_list); |
49090107 SRRH |
636 | } |
637 | ||
638 | static void ftrace_clear_event_pids(struct trace_array *tr) | |
639 | { | |
640 | mutex_lock(&event_mutex); | |
641 | __ftrace_clear_event_pids(tr); | |
642 | mutex_unlock(&event_mutex); | |
643 | } | |
644 | ||
e9dbfae5 SR |
645 | static void __put_system(struct event_subsystem *system) |
646 | { | |
647 | struct event_filter *filter = system->filter; | |
648 | ||
6e94a780 SR |
649 | WARN_ON_ONCE(system_refcount(system) == 0); |
650 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
651 | return; |
652 | ||
ae63b31e SR |
653 | list_del(&system->list); |
654 | ||
e9dbfae5 SR |
655 | if (filter) { |
656 | kfree(filter->filter_string); | |
657 | kfree(filter); | |
658 | } | |
79ac6ef5 | 659 | kfree_const(system->name); |
e9dbfae5 SR |
660 | kfree(system); |
661 | } | |
662 | ||
663 | static void __get_system(struct event_subsystem *system) | |
664 | { | |
6e94a780 SR |
665 | WARN_ON_ONCE(system_refcount(system) == 0); |
666 | system_refcount_inc(system); | |
e9dbfae5 SR |
667 | } |
668 | ||
7967b3e0 | 669 | static void __get_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
670 | { |
671 | WARN_ON_ONCE(dir->ref_count == 0); | |
672 | dir->ref_count++; | |
673 | __get_system(dir->subsystem); | |
674 | } | |
675 | ||
7967b3e0 | 676 | static void __put_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
677 | { |
678 | WARN_ON_ONCE(dir->ref_count == 0); | |
679 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 680 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
681 | |
682 | __put_system(dir->subsystem); | |
683 | if (!--dir->ref_count) | |
684 | kfree(dir); | |
685 | } | |
686 | ||
7967b3e0 | 687 | static void put_system(struct trace_subsystem_dir *dir) |
e9dbfae5 SR |
688 | { |
689 | mutex_lock(&event_mutex); | |
ae63b31e | 690 | __put_system_dir(dir); |
e9dbfae5 SR |
691 | mutex_unlock(&event_mutex); |
692 | } | |
693 | ||
7967b3e0 | 694 | static void remove_subsystem(struct trace_subsystem_dir *dir) |
f6a84bdc ON |
695 | { |
696 | if (!dir) | |
697 | return; | |
698 | ||
699 | if (!--dir->nr_events) { | |
8434dc93 | 700 | tracefs_remove_recursive(dir->entry); |
f6a84bdc ON |
701 | list_del(&dir->list); |
702 | __put_system_dir(dir); | |
703 | } | |
704 | } | |
705 | ||
7f1d2f82 | 706 | static void remove_event_file_dir(struct trace_event_file *file) |
f6a84bdc | 707 | { |
bf682c31 ON |
708 | struct dentry *dir = file->dir; |
709 | struct dentry *child; | |
710 | ||
711 | if (dir) { | |
712 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
946e51f2 | 713 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
7682c918 DH |
714 | if (d_really_is_positive(child)) /* probably unneeded */ |
715 | d_inode(child)->i_private = NULL; | |
bf682c31 ON |
716 | } |
717 | spin_unlock(&dir->d_lock); | |
718 | ||
8434dc93 | 719 | tracefs_remove_recursive(dir); |
bf682c31 ON |
720 | } |
721 | ||
f6a84bdc | 722 | list_del(&file->list); |
f6a84bdc | 723 | remove_subsystem(file->system); |
2448e349 | 724 | free_event_filter(file->filter); |
f6a84bdc ON |
725 | kmem_cache_free(file_cachep, file); |
726 | } | |
727 | ||
8f31bfe5 LZ |
728 | /* |
729 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
730 | */ | |
2a6c24af SRRH |
731 | static int |
732 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
733 | const char *sub, const char *event, int set) | |
b77e38aa | 734 | { |
7f1d2f82 | 735 | struct trace_event_file *file; |
2425bcb9 | 736 | struct trace_event_call *call; |
de7b2973 | 737 | const char *name; |
29f93943 | 738 | int ret = -EINVAL; |
989a0a3d | 739 | int eret = 0; |
8f31bfe5 | 740 | |
ae63b31e SR |
741 | list_for_each_entry(file, &tr->events, list) { |
742 | ||
743 | call = file->event_call; | |
687fcc4a | 744 | name = trace_event_name(call); |
8f31bfe5 | 745 | |
de7b2973 | 746 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
747 | continue; |
748 | ||
9b63776f SR |
749 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
750 | continue; | |
751 | ||
8f31bfe5 | 752 | if (match && |
de7b2973 | 753 | strcmp(match, name) != 0 && |
8f082018 | 754 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
755 | continue; |
756 | ||
8f082018 | 757 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
758 | continue; |
759 | ||
de7b2973 | 760 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
761 | continue; |
762 | ||
989a0a3d | 763 | ret = ftrace_event_enable_disable(file, set); |
8f31bfe5 | 764 | |
989a0a3d SRRH |
765 | /* |
766 | * Save the first error and return that. Some events | |
767 | * may still have been enabled, but let the user | |
768 | * know that something went wrong. | |
769 | */ | |
770 | if (ret && !eret) | |
771 | eret = ret; | |
772 | ||
773 | ret = eret; | |
8f31bfe5 | 774 | } |
2a6c24af SRRH |
775 | |
776 | return ret; | |
777 | } | |
778 | ||
779 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
780 | const char *sub, const char *event, int set) | |
781 | { | |
782 | int ret; | |
783 | ||
784 | mutex_lock(&event_mutex); | |
785 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
786 | mutex_unlock(&event_mutex); |
787 | ||
788 | return ret; | |
789 | } | |
790 | ||
595a438c | 791 | int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 792 | { |
b628b3e6 | 793 | char *event = NULL, *sub = NULL, *match; |
84fce9db | 794 | int ret; |
b628b3e6 SR |
795 | |
796 | /* | |
797 | * The buf format can be <subsystem>:<event-name> | |
798 | * *:<event-name> means any event by that name. | |
799 | * :<event-name> is the same. | |
800 | * | |
801 | * <subsystem>:* means all events in that subsystem | |
802 | * <subsystem>: means the same. | |
803 | * | |
804 | * <name> (no ':') means all events in a subsystem with | |
805 | * the name <name> or any event that matches <name> | |
806 | */ | |
807 | ||
808 | match = strsep(&buf, ":"); | |
809 | if (buf) { | |
810 | sub = match; | |
811 | event = buf; | |
812 | match = NULL; | |
813 | ||
814 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
815 | sub = NULL; | |
816 | if (!strlen(event) || strcmp(event, "*") == 0) | |
817 | event = NULL; | |
818 | } | |
b77e38aa | 819 | |
84fce9db JK |
820 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
821 | ||
822 | /* Put back the colon to allow this to be called again */ | |
823 | if (buf) | |
824 | *(buf - 1) = ':'; | |
825 | ||
826 | return ret; | |
b77e38aa | 827 | } |
f45d1225 | 828 | EXPORT_SYMBOL_GPL(ftrace_set_clr_event); |
b77e38aa | 829 | |
4671c794 SR |
830 | /** |
831 | * trace_set_clr_event - enable or disable an event | |
832 | * @system: system name to match (NULL for any system) | |
833 | * @event: event name to match (NULL for all events, within system) | |
834 | * @set: 1 to enable, 0 to disable | |
835 | * | |
836 | * This is a way for other parts of the kernel to enable or disable | |
837 | * event recording. | |
838 | * | |
839 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
840 | * registered events. | |
841 | */ | |
842 | int trace_set_clr_event(const char *system, const char *event, int set) | |
843 | { | |
ae63b31e SR |
844 | struct trace_array *tr = top_trace_array(); |
845 | ||
dc81e5e3 YY |
846 | if (!tr) |
847 | return -ENODEV; | |
848 | ||
ae63b31e | 849 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 850 | } |
56355b83 | 851 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 852 | |
b77e38aa SR |
853 | /* 128 should be much more than enough */ |
854 | #define EVENT_BUF_SIZE 127 | |
855 | ||
856 | static ssize_t | |
857 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
858 | size_t cnt, loff_t *ppos) | |
859 | { | |
48966364 | 860 | struct trace_parser parser; |
ae63b31e SR |
861 | struct seq_file *m = file->private_data; |
862 | struct trace_array *tr = m->private; | |
4ba7978e | 863 | ssize_t read, ret; |
b77e38aa | 864 | |
4ba7978e | 865 | if (!cnt) |
b77e38aa SR |
866 | return 0; |
867 | ||
1852fcce SR |
868 | ret = tracing_update_buffers(); |
869 | if (ret < 0) | |
870 | return ret; | |
871 | ||
48966364 | 872 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
873 | return -ENOMEM; |
874 | ||
48966364 | 875 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
876 | ||
4ba7978e | 877 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 878 | int set = 1; |
b77e38aa | 879 | |
48966364 | 880 | if (*parser.buffer == '!') |
b77e38aa | 881 | set = 0; |
b77e38aa | 882 | |
ae63b31e | 883 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 884 | if (ret) |
48966364 | 885 | goto out_put; |
b77e38aa | 886 | } |
b77e38aa SR |
887 | |
888 | ret = read; | |
889 | ||
48966364 | 890 | out_put: |
891 | trace_parser_put(&parser); | |
b77e38aa SR |
892 | |
893 | return ret; | |
894 | } | |
895 | ||
896 | static void * | |
897 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
898 | { | |
7f1d2f82 | 899 | struct trace_event_file *file = v; |
2425bcb9 | 900 | struct trace_event_call *call; |
ae63b31e | 901 | struct trace_array *tr = m->private; |
b77e38aa SR |
902 | |
903 | (*pos)++; | |
904 | ||
ae63b31e SR |
905 | list_for_each_entry_continue(file, &tr->events, list) { |
906 | call = file->event_call; | |
40e26815 SR |
907 | /* |
908 | * The ftrace subsystem is for showing formats only. | |
909 | * They can not be enabled or disabled via the event files. | |
910 | */ | |
d045437a SRRH |
911 | if (call->class && call->class->reg && |
912 | !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
ae63b31e | 913 | return file; |
40e26815 | 914 | } |
b77e38aa | 915 | |
30bd39cd | 916 | return NULL; |
b77e38aa SR |
917 | } |
918 | ||
919 | static void *t_start(struct seq_file *m, loff_t *pos) | |
920 | { | |
7f1d2f82 | 921 | struct trace_event_file *file; |
ae63b31e | 922 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
923 | loff_t l; |
924 | ||
20c8928a | 925 | mutex_lock(&event_mutex); |
e1c7e2a6 | 926 | |
7f1d2f82 | 927 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 928 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
929 | file = t_next(m, file, &l); |
930 | if (!file) | |
e1c7e2a6 LZ |
931 | break; |
932 | } | |
ae63b31e | 933 | return file; |
b77e38aa SR |
934 | } |
935 | ||
936 | static void * | |
937 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
938 | { | |
7f1d2f82 | 939 | struct trace_event_file *file = v; |
ae63b31e | 940 | struct trace_array *tr = m->private; |
b77e38aa SR |
941 | |
942 | (*pos)++; | |
943 | ||
ae63b31e | 944 | list_for_each_entry_continue(file, &tr->events, list) { |
5d6ad960 | 945 | if (file->flags & EVENT_FILE_FL_ENABLED) |
ae63b31e | 946 | return file; |
b77e38aa SR |
947 | } |
948 | ||
30bd39cd | 949 | return NULL; |
b77e38aa SR |
950 | } |
951 | ||
952 | static void *s_start(struct seq_file *m, loff_t *pos) | |
953 | { | |
7f1d2f82 | 954 | struct trace_event_file *file; |
ae63b31e | 955 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
956 | loff_t l; |
957 | ||
20c8928a | 958 | mutex_lock(&event_mutex); |
e1c7e2a6 | 959 | |
7f1d2f82 | 960 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 961 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
962 | file = s_next(m, file, &l); |
963 | if (!file) | |
e1c7e2a6 LZ |
964 | break; |
965 | } | |
ae63b31e | 966 | return file; |
b77e38aa SR |
967 | } |
968 | ||
969 | static int t_show(struct seq_file *m, void *v) | |
970 | { | |
7f1d2f82 | 971 | struct trace_event_file *file = v; |
2425bcb9 | 972 | struct trace_event_call *call = file->event_call; |
b77e38aa | 973 | |
8f082018 SR |
974 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
975 | seq_printf(m, "%s:", call->class->system); | |
687fcc4a | 976 | seq_printf(m, "%s\n", trace_event_name(call)); |
b77e38aa SR |
977 | |
978 | return 0; | |
979 | } | |
980 | ||
981 | static void t_stop(struct seq_file *m, void *p) | |
982 | { | |
20c8928a | 983 | mutex_unlock(&event_mutex); |
b77e38aa SR |
984 | } |
985 | ||
f4d34a87 SR |
986 | static void * |
987 | p_next(struct seq_file *m, void *v, loff_t *pos) | |
988 | { | |
989 | struct trace_array *tr = m->private; | |
990 | struct trace_pid_list *pid_list = rcu_dereference_sched(tr->filtered_pids); | |
f4d34a87 | 991 | |
5cc8976b | 992 | return trace_pid_next(pid_list, v, pos); |
f4d34a87 SR |
993 | } |
994 | ||
49090107 | 995 | static void *p_start(struct seq_file *m, loff_t *pos) |
fb662288 | 996 | __acquires(RCU) |
49090107 SRRH |
997 | { |
998 | struct trace_pid_list *pid_list; | |
999 | struct trace_array *tr = m->private; | |
1000 | ||
1001 | /* | |
1002 | * Grab the mutex, to keep calls to p_next() having the same | |
1003 | * tr->filtered_pids as p_start() has. | |
1004 | * If we just passed the tr->filtered_pids around, then RCU would | |
1005 | * have been enough, but doing that makes things more complex. | |
1006 | */ | |
1007 | mutex_lock(&event_mutex); | |
1008 | rcu_read_lock_sched(); | |
1009 | ||
1010 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1011 | ||
f4d34a87 | 1012 | if (!pid_list) |
49090107 SRRH |
1013 | return NULL; |
1014 | ||
5cc8976b | 1015 | return trace_pid_start(pid_list, pos); |
49090107 SRRH |
1016 | } |
1017 | ||
1018 | static void p_stop(struct seq_file *m, void *p) | |
fb662288 | 1019 | __releases(RCU) |
49090107 SRRH |
1020 | { |
1021 | rcu_read_unlock_sched(); | |
1022 | mutex_unlock(&event_mutex); | |
1023 | } | |
1024 | ||
1473e441 SR |
1025 | static ssize_t |
1026 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1027 | loff_t *ppos) | |
1028 | { | |
7f1d2f82 | 1029 | struct trace_event_file *file; |
bc6f6b08 | 1030 | unsigned long flags; |
a4390596 TZ |
1031 | char buf[4] = "0"; |
1032 | ||
bc6f6b08 ON |
1033 | mutex_lock(&event_mutex); |
1034 | file = event_file_data(filp); | |
1035 | if (likely(file)) | |
1036 | flags = file->flags; | |
1037 | mutex_unlock(&event_mutex); | |
1038 | ||
1039 | if (!file) | |
1040 | return -ENODEV; | |
1041 | ||
5d6ad960 SRRH |
1042 | if (flags & EVENT_FILE_FL_ENABLED && |
1043 | !(flags & EVENT_FILE_FL_SOFT_DISABLED)) | |
a4390596 TZ |
1044 | strcpy(buf, "1"); |
1045 | ||
5d6ad960 SRRH |
1046 | if (flags & EVENT_FILE_FL_SOFT_DISABLED || |
1047 | flags & EVENT_FILE_FL_SOFT_MODE) | |
a4390596 TZ |
1048 | strcat(buf, "*"); |
1049 | ||
1050 | strcat(buf, "\n"); | |
1473e441 | 1051 | |
417944c4 | 1052 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
1053 | } |
1054 | ||
1055 | static ssize_t | |
1056 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1057 | loff_t *ppos) | |
1058 | { | |
7f1d2f82 | 1059 | struct trace_event_file *file; |
1473e441 SR |
1060 | unsigned long val; |
1061 | int ret; | |
1062 | ||
22fe9b54 PH |
1063 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1064 | if (ret) | |
1473e441 SR |
1065 | return ret; |
1066 | ||
1852fcce SR |
1067 | ret = tracing_update_buffers(); |
1068 | if (ret < 0) | |
1069 | return ret; | |
1070 | ||
1473e441 SR |
1071 | switch (val) { |
1072 | case 0: | |
1473e441 | 1073 | case 1: |
bc6f6b08 | 1074 | ret = -ENODEV; |
11a241a3 | 1075 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
1076 | file = event_file_data(filp); |
1077 | if (likely(file)) | |
1078 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 1079 | mutex_unlock(&event_mutex); |
1473e441 SR |
1080 | break; |
1081 | ||
1082 | default: | |
1083 | return -EINVAL; | |
1084 | } | |
1085 | ||
1086 | *ppos += cnt; | |
1087 | ||
3b8e4273 | 1088 | return ret ? ret : cnt; |
1473e441 SR |
1089 | } |
1090 | ||
8ae79a13 SR |
1091 | static ssize_t |
1092 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1093 | loff_t *ppos) | |
1094 | { | |
c142b15d | 1095 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
7967b3e0 | 1096 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1097 | struct event_subsystem *system = dir->subsystem; |
2425bcb9 | 1098 | struct trace_event_call *call; |
7f1d2f82 | 1099 | struct trace_event_file *file; |
ae63b31e | 1100 | struct trace_array *tr = dir->tr; |
8ae79a13 | 1101 | char buf[2]; |
c142b15d | 1102 | int set = 0; |
8ae79a13 SR |
1103 | int ret; |
1104 | ||
8ae79a13 | 1105 | mutex_lock(&event_mutex); |
ae63b31e SR |
1106 | list_for_each_entry(file, &tr->events, list) { |
1107 | call = file->event_call; | |
687fcc4a | 1108 | if (!trace_event_name(call) || !call->class || !call->class->reg) |
8ae79a13 SR |
1109 | continue; |
1110 | ||
40ee4dff | 1111 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
1112 | continue; |
1113 | ||
1114 | /* | |
1115 | * We need to find out if all the events are set | |
1116 | * or if all events or cleared, or if we have | |
1117 | * a mixture. | |
1118 | */ | |
5d6ad960 | 1119 | set |= (1 << !!(file->flags & EVENT_FILE_FL_ENABLED)); |
c142b15d | 1120 | |
8ae79a13 SR |
1121 | /* |
1122 | * If we have a mixture, no need to look further. | |
1123 | */ | |
c142b15d | 1124 | if (set == 3) |
8ae79a13 SR |
1125 | break; |
1126 | } | |
1127 | mutex_unlock(&event_mutex); | |
1128 | ||
c142b15d | 1129 | buf[0] = set_to_char[set]; |
8ae79a13 | 1130 | buf[1] = '\n'; |
8ae79a13 SR |
1131 | |
1132 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
1133 | ||
1134 | return ret; | |
1135 | } | |
1136 | ||
1137 | static ssize_t | |
1138 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1139 | loff_t *ppos) | |
1140 | { | |
7967b3e0 | 1141 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1142 | struct event_subsystem *system = dir->subsystem; |
40ee4dff | 1143 | const char *name = NULL; |
8ae79a13 | 1144 | unsigned long val; |
8ae79a13 SR |
1145 | ssize_t ret; |
1146 | ||
22fe9b54 PH |
1147 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1148 | if (ret) | |
8ae79a13 SR |
1149 | return ret; |
1150 | ||
1151 | ret = tracing_update_buffers(); | |
1152 | if (ret < 0) | |
1153 | return ret; | |
1154 | ||
8f31bfe5 | 1155 | if (val != 0 && val != 1) |
8ae79a13 | 1156 | return -EINVAL; |
8ae79a13 | 1157 | |
40ee4dff SR |
1158 | /* |
1159 | * Opening of "enable" adds a ref count to system, | |
1160 | * so the name is safe to use. | |
1161 | */ | |
1162 | if (system) | |
1163 | name = system->name; | |
1164 | ||
ae63b31e | 1165 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 1166 | if (ret) |
8f31bfe5 | 1167 | goto out; |
8ae79a13 SR |
1168 | |
1169 | ret = cnt; | |
1170 | ||
8f31bfe5 | 1171 | out: |
8ae79a13 SR |
1172 | *ppos += cnt; |
1173 | ||
1174 | return ret; | |
1175 | } | |
1176 | ||
2a37a3df SR |
1177 | enum { |
1178 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
1179 | FORMAT_FIELD_SEPERATOR = 2, |
1180 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
1181 | }; |
1182 | ||
1183 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 1184 | { |
2425bcb9 | 1185 | struct trace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
1186 | struct list_head *common_head = &ftrace_common_fields; |
1187 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 1188 | struct list_head *node = v; |
981d081e | 1189 | |
2a37a3df | 1190 | (*pos)++; |
5a65e956 | 1191 | |
2a37a3df SR |
1192 | switch ((unsigned long)v) { |
1193 | case FORMAT_HEADER: | |
7710b639 ON |
1194 | node = common_head; |
1195 | break; | |
5a65e956 | 1196 | |
86397dc3 | 1197 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
1198 | node = head; |
1199 | break; | |
5a65e956 | 1200 | |
2a37a3df SR |
1201 | case FORMAT_PRINTFMT: |
1202 | /* all done */ | |
1203 | return NULL; | |
5a65e956 LJ |
1204 | } |
1205 | ||
7710b639 ON |
1206 | node = node->prev; |
1207 | if (node == common_head) | |
86397dc3 | 1208 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 1209 | else if (node == head) |
2a37a3df | 1210 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
1211 | else |
1212 | return node; | |
2a37a3df SR |
1213 | } |
1214 | ||
1215 | static int f_show(struct seq_file *m, void *v) | |
1216 | { | |
2425bcb9 | 1217 | struct trace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
1218 | struct ftrace_event_field *field; |
1219 | const char *array_descriptor; | |
1220 | ||
1221 | switch ((unsigned long)v) { | |
1222 | case FORMAT_HEADER: | |
687fcc4a | 1223 | seq_printf(m, "name: %s\n", trace_event_name(call)); |
2a37a3df | 1224 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 1225 | seq_puts(m, "format:\n"); |
8728fe50 | 1226 | return 0; |
5a65e956 | 1227 | |
86397dc3 LZ |
1228 | case FORMAT_FIELD_SEPERATOR: |
1229 | seq_putc(m, '\n'); | |
1230 | return 0; | |
1231 | ||
2a37a3df SR |
1232 | case FORMAT_PRINTFMT: |
1233 | seq_printf(m, "\nprint fmt: %s\n", | |
1234 | call->print_fmt); | |
1235 | return 0; | |
981d081e | 1236 | } |
8728fe50 | 1237 | |
7710b639 | 1238 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
1239 | /* |
1240 | * Smartly shows the array type(except dynamic array). | |
1241 | * Normal: | |
1242 | * field:TYPE VAR | |
1243 | * If TYPE := TYPE[LEN], it is shown: | |
1244 | * field:TYPE VAR[LEN] | |
1245 | */ | |
1246 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 1247 | |
b6b27355 | 1248 | if (str_has_prefix(field->type, "__data_loc")) |
2a37a3df | 1249 | array_descriptor = NULL; |
8728fe50 | 1250 | |
2a37a3df SR |
1251 | if (!array_descriptor) |
1252 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1253 | field->type, field->name, field->offset, | |
1254 | field->size, !!field->is_signed); | |
1255 | else | |
1256 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1257 | (int)(array_descriptor - field->type), | |
1258 | field->type, field->name, | |
1259 | array_descriptor, field->offset, | |
1260 | field->size, !!field->is_signed); | |
8728fe50 | 1261 | |
2a37a3df SR |
1262 | return 0; |
1263 | } | |
5a65e956 | 1264 | |
7710b639 ON |
1265 | static void *f_start(struct seq_file *m, loff_t *pos) |
1266 | { | |
1267 | void *p = (void *)FORMAT_HEADER; | |
1268 | loff_t l = 0; | |
1269 | ||
c5a44a12 ON |
1270 | /* ->stop() is called even if ->start() fails */ |
1271 | mutex_lock(&event_mutex); | |
1272 | if (!event_file_data(m->private)) | |
1273 | return ERR_PTR(-ENODEV); | |
1274 | ||
7710b639 ON |
1275 | while (l < *pos && p) |
1276 | p = f_next(m, p, &l); | |
1277 | ||
1278 | return p; | |
1279 | } | |
1280 | ||
2a37a3df SR |
1281 | static void f_stop(struct seq_file *m, void *p) |
1282 | { | |
c5a44a12 | 1283 | mutex_unlock(&event_mutex); |
2a37a3df | 1284 | } |
981d081e | 1285 | |
2a37a3df SR |
1286 | static const struct seq_operations trace_format_seq_ops = { |
1287 | .start = f_start, | |
1288 | .next = f_next, | |
1289 | .stop = f_stop, | |
1290 | .show = f_show, | |
1291 | }; | |
1292 | ||
1293 | static int trace_format_open(struct inode *inode, struct file *file) | |
1294 | { | |
2a37a3df SR |
1295 | struct seq_file *m; |
1296 | int ret; | |
1297 | ||
17911ff3 SRV |
1298 | /* Do we want to hide event format files on tracefs lockdown? */ |
1299 | ||
2a37a3df SR |
1300 | ret = seq_open(file, &trace_format_seq_ops); |
1301 | if (ret < 0) | |
1302 | return ret; | |
1303 | ||
1304 | m = file->private_data; | |
c5a44a12 | 1305 | m->private = file; |
2a37a3df SR |
1306 | |
1307 | return 0; | |
981d081e SR |
1308 | } |
1309 | ||
23725aee PZ |
1310 | static ssize_t |
1311 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1312 | { | |
1a11126b | 1313 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1314 | char buf[32]; |
1315 | int len; | |
23725aee | 1316 | |
1a11126b ON |
1317 | if (unlikely(!id)) |
1318 | return -ENODEV; | |
1319 | ||
1320 | len = sprintf(buf, "%d\n", id); | |
1321 | ||
cd458ba9 | 1322 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1323 | } |
1324 | ||
7ce7e424 TZ |
1325 | static ssize_t |
1326 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1327 | loff_t *ppos) | |
1328 | { | |
7f1d2f82 | 1329 | struct trace_event_file *file; |
7ce7e424 | 1330 | struct trace_seq *s; |
e2912b09 | 1331 | int r = -ENODEV; |
7ce7e424 TZ |
1332 | |
1333 | if (*ppos) | |
1334 | return 0; | |
1335 | ||
1336 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1337 | |
7ce7e424 TZ |
1338 | if (!s) |
1339 | return -ENOMEM; | |
1340 | ||
1341 | trace_seq_init(s); | |
1342 | ||
e2912b09 | 1343 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1344 | file = event_file_data(filp); |
1345 | if (file) | |
1346 | print_event_filter(file, s); | |
e2912b09 ON |
1347 | mutex_unlock(&event_mutex); |
1348 | ||
f306cc82 | 1349 | if (file) |
5ac48378 SRRH |
1350 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1351 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1352 | |
1353 | kfree(s); | |
1354 | ||
1355 | return r; | |
1356 | } | |
1357 | ||
1358 | static ssize_t | |
1359 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1360 | loff_t *ppos) | |
1361 | { | |
7f1d2f82 | 1362 | struct trace_event_file *file; |
8b372562 | 1363 | char *buf; |
e2912b09 | 1364 | int err = -ENODEV; |
7ce7e424 | 1365 | |
8b372562 | 1366 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1367 | return -EINVAL; |
1368 | ||
70f6cbb6 AV |
1369 | buf = memdup_user_nul(ubuf, cnt); |
1370 | if (IS_ERR(buf)) | |
1371 | return PTR_ERR(buf); | |
7ce7e424 | 1372 | |
e2912b09 | 1373 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1374 | file = event_file_data(filp); |
1375 | if (file) | |
1376 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1377 | mutex_unlock(&event_mutex); |
1378 | ||
70f6cbb6 | 1379 | kfree(buf); |
8b372562 | 1380 | if (err < 0) |
44e9c8b7 | 1381 | return err; |
0a19e53c | 1382 | |
7ce7e424 TZ |
1383 | *ppos += cnt; |
1384 | ||
1385 | return cnt; | |
1386 | } | |
1387 | ||
e9dbfae5 SR |
1388 | static LIST_HEAD(event_subsystems); |
1389 | ||
1390 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1391 | { | |
1392 | struct event_subsystem *system = NULL; | |
7967b3e0 | 1393 | struct trace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
ae63b31e | 1394 | struct trace_array *tr; |
e9dbfae5 SR |
1395 | int ret; |
1396 | ||
d6d3523c GB |
1397 | if (tracing_is_disabled()) |
1398 | return -ENODEV; | |
1399 | ||
e9dbfae5 SR |
1400 | /* Make sure the system still exists */ |
1401 | mutex_lock(&event_mutex); | |
12ecef0c | 1402 | mutex_lock(&trace_types_lock); |
ae63b31e SR |
1403 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1404 | list_for_each_entry(dir, &tr->systems, list) { | |
1405 | if (dir == inode->i_private) { | |
1406 | /* Don't open systems with no events */ | |
1407 | if (dir->nr_events) { | |
1408 | __get_system_dir(dir); | |
1409 | system = dir->subsystem; | |
1410 | } | |
1411 | goto exit_loop; | |
e9dbfae5 | 1412 | } |
e9dbfae5 SR |
1413 | } |
1414 | } | |
ae63b31e | 1415 | exit_loop: |
a8227415 | 1416 | mutex_unlock(&trace_types_lock); |
12ecef0c | 1417 | mutex_unlock(&event_mutex); |
e9dbfae5 | 1418 | |
ae63b31e | 1419 | if (!system) |
e9dbfae5 SR |
1420 | return -ENODEV; |
1421 | ||
ae63b31e SR |
1422 | /* Some versions of gcc think dir can be uninitialized here */ |
1423 | WARN_ON(!dir); | |
1424 | ||
8e2e2fa4 SRRH |
1425 | /* Still need to increment the ref count of the system */ |
1426 | if (trace_array_get(tr) < 0) { | |
1427 | put_system(dir); | |
1428 | return -ENODEV; | |
1429 | } | |
1430 | ||
e9dbfae5 | 1431 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1432 | if (ret < 0) { |
1433 | trace_array_put(tr); | |
ae63b31e | 1434 | put_system(dir); |
8e2e2fa4 | 1435 | } |
ae63b31e SR |
1436 | |
1437 | return ret; | |
1438 | } | |
1439 | ||
1440 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1441 | { | |
7967b3e0 | 1442 | struct trace_subsystem_dir *dir; |
ae63b31e SR |
1443 | struct trace_array *tr = inode->i_private; |
1444 | int ret; | |
1445 | ||
1446 | /* Make a temporary dir that has no system but points to tr */ | |
1447 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
aa07d71f | 1448 | if (!dir) |
ae63b31e | 1449 | return -ENOMEM; |
ae63b31e | 1450 | |
aa07d71f | 1451 | ret = tracing_open_generic_tr(inode, filp); |
8e2e2fa4 | 1452 | if (ret < 0) { |
ae63b31e | 1453 | kfree(dir); |
d6d3523c | 1454 | return ret; |
8e2e2fa4 | 1455 | } |
aa07d71f | 1456 | dir->tr = tr; |
ae63b31e | 1457 | filp->private_data = dir; |
e9dbfae5 | 1458 | |
d6d3523c | 1459 | return 0; |
e9dbfae5 SR |
1460 | } |
1461 | ||
1462 | static int subsystem_release(struct inode *inode, struct file *file) | |
1463 | { | |
7967b3e0 | 1464 | struct trace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1465 | |
8e2e2fa4 SRRH |
1466 | trace_array_put(dir->tr); |
1467 | ||
ae63b31e SR |
1468 | /* |
1469 | * If dir->subsystem is NULL, then this is a temporary | |
1470 | * descriptor that was made for a trace_array to enable | |
1471 | * all subsystems. | |
1472 | */ | |
1473 | if (dir->subsystem) | |
1474 | put_system(dir); | |
1475 | else | |
1476 | kfree(dir); | |
e9dbfae5 SR |
1477 | |
1478 | return 0; | |
1479 | } | |
1480 | ||
cfb180f3 TZ |
1481 | static ssize_t |
1482 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1483 | loff_t *ppos) | |
1484 | { | |
7967b3e0 | 1485 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1486 | struct event_subsystem *system = dir->subsystem; |
cfb180f3 TZ |
1487 | struct trace_seq *s; |
1488 | int r; | |
1489 | ||
1490 | if (*ppos) | |
1491 | return 0; | |
1492 | ||
1493 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1494 | if (!s) | |
1495 | return -ENOMEM; | |
1496 | ||
1497 | trace_seq_init(s); | |
1498 | ||
8b372562 | 1499 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1500 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1501 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1502 | |
1503 | kfree(s); | |
1504 | ||
1505 | return r; | |
1506 | } | |
1507 | ||
1508 | static ssize_t | |
1509 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1510 | loff_t *ppos) | |
1511 | { | |
7967b3e0 | 1512 | struct trace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1513 | char *buf; |
cfb180f3 TZ |
1514 | int err; |
1515 | ||
8b372562 | 1516 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1517 | return -EINVAL; |
1518 | ||
70f6cbb6 AV |
1519 | buf = memdup_user_nul(ubuf, cnt); |
1520 | if (IS_ERR(buf)) | |
1521 | return PTR_ERR(buf); | |
cfb180f3 | 1522 | |
ae63b31e | 1523 | err = apply_subsystem_event_filter(dir, buf); |
70f6cbb6 | 1524 | kfree(buf); |
8b372562 | 1525 | if (err < 0) |
44e9c8b7 | 1526 | return err; |
cfb180f3 TZ |
1527 | |
1528 | *ppos += cnt; | |
1529 | ||
1530 | return cnt; | |
1531 | } | |
1532 | ||
d1b182a8 SR |
1533 | static ssize_t |
1534 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1535 | { | |
1536 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1537 | struct trace_seq *s; | |
1538 | int r; | |
1539 | ||
1540 | if (*ppos) | |
1541 | return 0; | |
1542 | ||
1543 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1544 | if (!s) | |
1545 | return -ENOMEM; | |
1546 | ||
1547 | trace_seq_init(s); | |
1548 | ||
1549 | func(s); | |
5ac48378 SRRH |
1550 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1551 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1552 | |
1553 | kfree(s); | |
1554 | ||
1555 | return r; | |
1556 | } | |
1557 | ||
8ca532ad SRRH |
1558 | static void ignore_task_cpu(void *data) |
1559 | { | |
1560 | struct trace_array *tr = data; | |
1561 | struct trace_pid_list *pid_list; | |
1562 | ||
1563 | /* | |
1564 | * This function is called by on_each_cpu() while the | |
1565 | * event_mutex is held. | |
1566 | */ | |
1567 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
1568 | mutex_is_locked(&event_mutex)); | |
1569 | ||
1570 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
4e267db1 | 1571 | trace_ignore_this_task(pid_list, current)); |
8ca532ad SRRH |
1572 | } |
1573 | ||
49090107 | 1574 | static ssize_t |
3fdaf80f | 1575 | ftrace_event_pid_write(struct file *filp, const char __user *ubuf, |
49090107 SRRH |
1576 | size_t cnt, loff_t *ppos) |
1577 | { | |
3fdaf80f | 1578 | struct seq_file *m = filp->private_data; |
49090107 SRRH |
1579 | struct trace_array *tr = m->private; |
1580 | struct trace_pid_list *filtered_pids = NULL; | |
f4d34a87 | 1581 | struct trace_pid_list *pid_list; |
3fdaf80f | 1582 | struct trace_event_file *file; |
76c813e2 | 1583 | ssize_t ret; |
49090107 SRRH |
1584 | |
1585 | if (!cnt) | |
1586 | return 0; | |
1587 | ||
1588 | ret = tracing_update_buffers(); | |
1589 | if (ret < 0) | |
1590 | return ret; | |
1591 | ||
49090107 | 1592 | mutex_lock(&event_mutex); |
76c813e2 | 1593 | |
f4d34a87 SR |
1594 | filtered_pids = rcu_dereference_protected(tr->filtered_pids, |
1595 | lockdep_is_held(&event_mutex)); | |
1596 | ||
76c813e2 SRRH |
1597 | ret = trace_pid_write(filtered_pids, &pid_list, ubuf, cnt); |
1598 | if (ret < 0) | |
f4d34a87 | 1599 | goto out; |
49090107 | 1600 | |
49090107 SRRH |
1601 | rcu_assign_pointer(tr->filtered_pids, pid_list); |
1602 | ||
3fdaf80f SRRH |
1603 | list_for_each_entry(file, &tr->events, list) { |
1604 | set_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
1605 | } | |
49090107 SRRH |
1606 | |
1607 | if (filtered_pids) { | |
e0a568dc | 1608 | tracepoint_synchronize_unregister(); |
76c813e2 SRRH |
1609 | trace_free_pid_list(filtered_pids); |
1610 | } else if (pid_list) { | |
3fdaf80f SRRH |
1611 | /* |
1612 | * Register a probe that is called before all other probes | |
1613 | * to set ignore_pid if next or prev do not match. | |
1614 | * Register a probe this is called after all other probes | |
1615 | * to only keep ignore_pid set if next pid matches. | |
1616 | */ | |
1617 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_pre, | |
1618 | tr, INT_MAX); | |
1619 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_post, | |
1620 | tr, 0); | |
1621 | ||
1622 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, | |
1623 | tr, INT_MAX); | |
1624 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, | |
1625 | tr, 0); | |
0f72e37e SRRH |
1626 | |
1627 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, | |
1628 | tr, INT_MAX); | |
1629 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, | |
1630 | tr, 0); | |
1631 | ||
1632 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_pre, | |
1633 | tr, INT_MAX); | |
1634 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_post, | |
1635 | tr, 0); | |
49090107 SRRH |
1636 | } |
1637 | ||
799fd44c SRRH |
1638 | /* |
1639 | * Ignoring of pids is done at task switch. But we have to | |
1640 | * check for those tasks that are currently running. | |
1641 | * Always do this in case a pid was appended or removed. | |
1642 | */ | |
1643 | on_each_cpu(ignore_task_cpu, tr, 1); | |
1644 | ||
f4d34a87 | 1645 | out: |
3fdaf80f SRRH |
1646 | mutex_unlock(&event_mutex); |
1647 | ||
76c813e2 SRRH |
1648 | if (ret > 0) |
1649 | *ppos += ret; | |
49090107 SRRH |
1650 | |
1651 | return ret; | |
1652 | } | |
1653 | ||
15075cac SR |
1654 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1655 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
49090107 | 1656 | static int ftrace_event_set_pid_open(struct inode *inode, struct file *file); |
f77d09a3 | 1657 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1658 | |
b77e38aa SR |
1659 | static const struct seq_operations show_event_seq_ops = { |
1660 | .start = t_start, | |
1661 | .next = t_next, | |
1662 | .show = t_show, | |
1663 | .stop = t_stop, | |
1664 | }; | |
1665 | ||
1666 | static const struct seq_operations show_set_event_seq_ops = { | |
1667 | .start = s_start, | |
1668 | .next = s_next, | |
1669 | .show = t_show, | |
1670 | .stop = t_stop, | |
1671 | }; | |
1672 | ||
49090107 SRRH |
1673 | static const struct seq_operations show_set_pid_seq_ops = { |
1674 | .start = p_start, | |
1675 | .next = p_next, | |
5cc8976b | 1676 | .show = trace_pid_show, |
49090107 SRRH |
1677 | .stop = p_stop, |
1678 | }; | |
1679 | ||
2314c4ae | 1680 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1681 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1682 | .read = seq_read, |
1683 | .llseek = seq_lseek, | |
1684 | .release = seq_release, | |
1685 | }; | |
1686 | ||
b77e38aa | 1687 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1688 | .open = ftrace_event_set_open, |
b77e38aa SR |
1689 | .read = seq_read, |
1690 | .write = ftrace_event_write, | |
1691 | .llseek = seq_lseek, | |
f77d09a3 | 1692 | .release = ftrace_event_release, |
b77e38aa SR |
1693 | }; |
1694 | ||
49090107 SRRH |
1695 | static const struct file_operations ftrace_set_event_pid_fops = { |
1696 | .open = ftrace_event_set_pid_open, | |
1697 | .read = seq_read, | |
1698 | .write = ftrace_event_pid_write, | |
1699 | .llseek = seq_lseek, | |
1700 | .release = ftrace_event_release, | |
1701 | }; | |
1702 | ||
1473e441 | 1703 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 1704 | .open = tracing_open_generic, |
1473e441 SR |
1705 | .read = event_enable_read, |
1706 | .write = event_enable_write, | |
6038f373 | 1707 | .llseek = default_llseek, |
1473e441 SR |
1708 | }; |
1709 | ||
981d081e | 1710 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1711 | .open = trace_format_open, |
1712 | .read = seq_read, | |
1713 | .llseek = seq_lseek, | |
1714 | .release = seq_release, | |
981d081e SR |
1715 | }; |
1716 | ||
23725aee | 1717 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1718 | .read = event_id_read, |
6038f373 | 1719 | .llseek = default_llseek, |
23725aee PZ |
1720 | }; |
1721 | ||
7ce7e424 TZ |
1722 | static const struct file_operations ftrace_event_filter_fops = { |
1723 | .open = tracing_open_generic, | |
1724 | .read = event_filter_read, | |
1725 | .write = event_filter_write, | |
6038f373 | 1726 | .llseek = default_llseek, |
7ce7e424 TZ |
1727 | }; |
1728 | ||
cfb180f3 | 1729 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1730 | .open = subsystem_open, |
cfb180f3 TZ |
1731 | .read = subsystem_filter_read, |
1732 | .write = subsystem_filter_write, | |
6038f373 | 1733 | .llseek = default_llseek, |
e9dbfae5 | 1734 | .release = subsystem_release, |
cfb180f3 TZ |
1735 | }; |
1736 | ||
8ae79a13 | 1737 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1738 | .open = subsystem_open, |
8ae79a13 SR |
1739 | .read = system_enable_read, |
1740 | .write = system_enable_write, | |
6038f373 | 1741 | .llseek = default_llseek, |
40ee4dff | 1742 | .release = subsystem_release, |
8ae79a13 SR |
1743 | }; |
1744 | ||
ae63b31e SR |
1745 | static const struct file_operations ftrace_tr_enable_fops = { |
1746 | .open = system_tr_open, | |
1747 | .read = system_enable_read, | |
1748 | .write = system_enable_write, | |
1749 | .llseek = default_llseek, | |
1750 | .release = subsystem_release, | |
1751 | }; | |
1752 | ||
d1b182a8 SR |
1753 | static const struct file_operations ftrace_show_header_fops = { |
1754 | .open = tracing_open_generic, | |
1755 | .read = show_header, | |
6038f373 | 1756 | .llseek = default_llseek, |
d1b182a8 SR |
1757 | }; |
1758 | ||
ae63b31e SR |
1759 | static int |
1760 | ftrace_event_open(struct inode *inode, struct file *file, | |
1761 | const struct seq_operations *seq_ops) | |
1473e441 | 1762 | { |
ae63b31e SR |
1763 | struct seq_file *m; |
1764 | int ret; | |
1473e441 | 1765 | |
17911ff3 SRV |
1766 | ret = security_locked_down(LOCKDOWN_TRACEFS); |
1767 | if (ret) | |
1768 | return ret; | |
1769 | ||
ae63b31e SR |
1770 | ret = seq_open(file, seq_ops); |
1771 | if (ret < 0) | |
1772 | return ret; | |
1773 | m = file->private_data; | |
1774 | /* copy tr over to seq ops */ | |
1775 | m->private = inode->i_private; | |
1473e441 | 1776 | |
ae63b31e | 1777 | return ret; |
1473e441 SR |
1778 | } |
1779 | ||
f77d09a3 AL |
1780 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1781 | { | |
1782 | struct trace_array *tr = inode->i_private; | |
1783 | ||
1784 | trace_array_put(tr); | |
1785 | ||
1786 | return seq_release(inode, file); | |
1787 | } | |
1788 | ||
15075cac SR |
1789 | static int |
1790 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1791 | { | |
1792 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1793 | ||
17911ff3 | 1794 | /* Checks for tracefs lockdown */ |
ae63b31e | 1795 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1796 | } |
1797 | ||
1798 | static int | |
1799 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1800 | { | |
1801 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1802 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
1803 | int ret; |
1804 | ||
8530dec6 SRV |
1805 | ret = tracing_check_open_get_tr(tr); |
1806 | if (ret) | |
1807 | return ret; | |
15075cac SR |
1808 | |
1809 | if ((file->f_mode & FMODE_WRITE) && | |
1810 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1811 | ftrace_clear_events(tr); |
15075cac | 1812 | |
f77d09a3 AL |
1813 | ret = ftrace_event_open(inode, file, seq_ops); |
1814 | if (ret < 0) | |
1815 | trace_array_put(tr); | |
1816 | return ret; | |
ae63b31e SR |
1817 | } |
1818 | ||
49090107 SRRH |
1819 | static int |
1820 | ftrace_event_set_pid_open(struct inode *inode, struct file *file) | |
1821 | { | |
1822 | const struct seq_operations *seq_ops = &show_set_pid_seq_ops; | |
1823 | struct trace_array *tr = inode->i_private; | |
1824 | int ret; | |
1825 | ||
8530dec6 SRV |
1826 | ret = tracing_check_open_get_tr(tr); |
1827 | if (ret) | |
1828 | return ret; | |
49090107 SRRH |
1829 | |
1830 | if ((file->f_mode & FMODE_WRITE) && | |
1831 | (file->f_flags & O_TRUNC)) | |
1832 | ftrace_clear_event_pids(tr); | |
1833 | ||
1834 | ret = ftrace_event_open(inode, file, seq_ops); | |
1835 | if (ret < 0) | |
1836 | trace_array_put(tr); | |
1837 | return ret; | |
1838 | } | |
1839 | ||
ae63b31e SR |
1840 | static struct event_subsystem * |
1841 | create_new_subsystem(const char *name) | |
1842 | { | |
1843 | struct event_subsystem *system; | |
1844 | ||
1845 | /* need to create new entry */ | |
1846 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
1847 | if (!system) | |
1848 | return NULL; | |
1849 | ||
1850 | system->ref_count = 1; | |
6e94a780 SR |
1851 | |
1852 | /* Only allocate if dynamic (kprobes and modules) */ | |
79ac6ef5 RV |
1853 | system->name = kstrdup_const(name, GFP_KERNEL); |
1854 | if (!system->name) | |
1855 | goto out_free; | |
ae63b31e SR |
1856 | |
1857 | system->filter = NULL; | |
1858 | ||
1859 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
1860 | if (!system->filter) | |
1861 | goto out_free; | |
1862 | ||
1863 | list_add(&system->list, &event_subsystems); | |
1864 | ||
1865 | return system; | |
1866 | ||
1867 | out_free: | |
79ac6ef5 | 1868 | kfree_const(system->name); |
ae63b31e SR |
1869 | kfree(system); |
1870 | return NULL; | |
15075cac SR |
1871 | } |
1872 | ||
6ecc2d1c | 1873 | static struct dentry * |
ae63b31e | 1874 | event_subsystem_dir(struct trace_array *tr, const char *name, |
7f1d2f82 | 1875 | struct trace_event_file *file, struct dentry *parent) |
6ecc2d1c | 1876 | { |
7967b3e0 | 1877 | struct trace_subsystem_dir *dir; |
6ecc2d1c | 1878 | struct event_subsystem *system; |
e1112b4d | 1879 | struct dentry *entry; |
6ecc2d1c SR |
1880 | |
1881 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
1882 | list_for_each_entry(dir, &tr->systems, list) { |
1883 | system = dir->subsystem; | |
dc82ec98 | 1884 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
1885 | dir->nr_events++; |
1886 | file->system = dir; | |
1887 | return dir->entry; | |
dc82ec98 | 1888 | } |
6ecc2d1c SR |
1889 | } |
1890 | ||
ae63b31e SR |
1891 | /* Now see if the system itself exists. */ |
1892 | list_for_each_entry(system, &event_subsystems, list) { | |
1893 | if (strcmp(system->name, name) == 0) | |
1894 | break; | |
6ecc2d1c | 1895 | } |
ae63b31e SR |
1896 | /* Reset system variable when not found */ |
1897 | if (&system->list == &event_subsystems) | |
1898 | system = NULL; | |
6ecc2d1c | 1899 | |
ae63b31e SR |
1900 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
1901 | if (!dir) | |
1902 | goto out_fail; | |
6ecc2d1c | 1903 | |
ae63b31e SR |
1904 | if (!system) { |
1905 | system = create_new_subsystem(name); | |
1906 | if (!system) | |
1907 | goto out_free; | |
1908 | } else | |
1909 | __get_system(system); | |
1910 | ||
8434dc93 | 1911 | dir->entry = tracefs_create_dir(name, parent); |
ae63b31e | 1912 | if (!dir->entry) { |
3448bac3 | 1913 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
1914 | __put_system(system); |
1915 | goto out_free; | |
6d723736 SR |
1916 | } |
1917 | ||
ae63b31e SR |
1918 | dir->tr = tr; |
1919 | dir->ref_count = 1; | |
1920 | dir->nr_events = 1; | |
1921 | dir->subsystem = system; | |
1922 | file->system = dir; | |
8b372562 | 1923 | |
8434dc93 | 1924 | entry = tracefs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 1925 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
1926 | if (!entry) { |
1927 | kfree(system->filter); | |
1928 | system->filter = NULL; | |
8434dc93 | 1929 | pr_warn("Could not create tracefs '%s/filter' entry\n", name); |
8b372562 | 1930 | } |
e1112b4d | 1931 | |
ae63b31e | 1932 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 1933 | &ftrace_system_enable_fops); |
8ae79a13 | 1934 | |
ae63b31e SR |
1935 | list_add(&dir->list, &tr->systems); |
1936 | ||
1937 | return dir->entry; | |
1938 | ||
1939 | out_free: | |
1940 | kfree(dir); | |
1941 | out_fail: | |
1942 | /* Only print this message if failed on memory allocation */ | |
1943 | if (!dir || !system) | |
3448bac3 | 1944 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 1945 | return NULL; |
6ecc2d1c SR |
1946 | } |
1947 | ||
1473e441 | 1948 | static int |
7f1d2f82 | 1949 | event_create_dir(struct dentry *parent, struct trace_event_file *file) |
1473e441 | 1950 | { |
2425bcb9 | 1951 | struct trace_event_call *call = file->event_call; |
ae63b31e | 1952 | struct trace_array *tr = file->tr; |
2e33af02 | 1953 | struct list_head *head; |
ae63b31e | 1954 | struct dentry *d_events; |
de7b2973 | 1955 | const char *name; |
fd994989 | 1956 | int ret; |
1473e441 | 1957 | |
6ecc2d1c SR |
1958 | /* |
1959 | * If the trace point header did not define TRACE_SYSTEM | |
1960 | * then the system would be called "TRACE_SYSTEM". | |
1961 | */ | |
ae63b31e SR |
1962 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
1963 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
1964 | if (!d_events) | |
1965 | return -ENOMEM; | |
1966 | } else | |
1967 | d_events = parent; | |
1968 | ||
687fcc4a | 1969 | name = trace_event_name(call); |
8434dc93 | 1970 | file->dir = tracefs_create_dir(name, d_events); |
ae63b31e | 1971 | if (!file->dir) { |
8434dc93 | 1972 | pr_warn("Could not create tracefs '%s' directory\n", name); |
1473e441 SR |
1973 | return -1; |
1974 | } | |
1975 | ||
9b63776f | 1976 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 1977 | trace_create_file("enable", 0644, file->dir, file, |
620a30e9 | 1978 | &ftrace_enable_fops); |
1473e441 | 1979 | |
2239291a | 1980 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 1981 | if (call->event.type && call->class->reg) |
1a11126b | 1982 | trace_create_file("id", 0444, file->dir, |
620a30e9 ON |
1983 | (void *)(long)call->event.type, |
1984 | &ftrace_event_id_fops); | |
2239291a | 1985 | #endif |
23725aee | 1986 | |
c9d932cf LZ |
1987 | /* |
1988 | * Other events may have the same class. Only update | |
1989 | * the fields if they are not already defined. | |
1990 | */ | |
1991 | head = trace_get_fields(call); | |
1992 | if (list_empty(head)) { | |
1993 | ret = call->class->define_fields(call); | |
1994 | if (ret < 0) { | |
3448bac3 FF |
1995 | pr_warn("Could not initialize trace point events/%s\n", |
1996 | name); | |
ae63b31e | 1997 | return -1; |
cf027f64 TZ |
1998 | } |
1999 | } | |
2000 | ||
854145e0 CH |
2001 | /* |
2002 | * Only event directories that can be enabled should have | |
5d948c86 | 2003 | * triggers or filters. |
854145e0 | 2004 | */ |
5d948c86 SRV |
2005 | if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) { |
2006 | trace_create_file("filter", 0644, file->dir, file, | |
2007 | &ftrace_event_filter_fops); | |
2008 | ||
854145e0 CH |
2009 | trace_create_file("trigger", 0644, file->dir, file, |
2010 | &event_trigger_fops); | |
5d948c86 | 2011 | } |
85f2b082 | 2012 | |
7ef224d1 TZ |
2013 | #ifdef CONFIG_HIST_TRIGGERS |
2014 | trace_create_file("hist", 0444, file->dir, file, | |
2015 | &event_hist_fops); | |
2016 | #endif | |
ae63b31e | 2017 | trace_create_file("format", 0444, file->dir, call, |
620a30e9 | 2018 | &ftrace_event_format_fops); |
6d723736 SR |
2019 | |
2020 | return 0; | |
2021 | } | |
2022 | ||
2425bcb9 | 2023 | static void remove_event_from_tracers(struct trace_event_call *call) |
ae63b31e | 2024 | { |
7f1d2f82 | 2025 | struct trace_event_file *file; |
ae63b31e SR |
2026 | struct trace_array *tr; |
2027 | ||
2028 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
2029 | if (file->event_call != call) |
2030 | continue; | |
2031 | ||
f6a84bdc | 2032 | remove_event_file_dir(file); |
ae63b31e SR |
2033 | /* |
2034 | * The do_for_each_event_file_safe() is | |
2035 | * a double loop. After finding the call for this | |
2036 | * trace_array, we use break to jump to the next | |
2037 | * trace_array. | |
2038 | */ | |
2039 | break; | |
2040 | } while_for_each_event_file(); | |
2041 | } | |
2042 | ||
2425bcb9 | 2043 | static void event_remove(struct trace_event_call *call) |
8781915a | 2044 | { |
ae63b31e | 2045 | struct trace_array *tr; |
7f1d2f82 | 2046 | struct trace_event_file *file; |
ae63b31e SR |
2047 | |
2048 | do_for_each_event_file(tr, file) { | |
2049 | if (file->event_call != call) | |
2050 | continue; | |
065e63f9 SRV |
2051 | |
2052 | if (file->flags & EVENT_FILE_FL_WAS_ENABLED) | |
2053 | tr->clear_trace = true; | |
2054 | ||
ae63b31e SR |
2055 | ftrace_event_enable_disable(file, 0); |
2056 | /* | |
2057 | * The do_for_each_event_file() is | |
2058 | * a double loop. After finding the call for this | |
2059 | * trace_array, we use break to jump to the next | |
2060 | * trace_array. | |
2061 | */ | |
2062 | break; | |
2063 | } while_for_each_event_file(); | |
2064 | ||
8781915a | 2065 | if (call->event.funcs) |
9023c930 | 2066 | __unregister_trace_event(&call->event); |
ae63b31e | 2067 | remove_event_from_tracers(call); |
8781915a EG |
2068 | list_del(&call->list); |
2069 | } | |
2070 | ||
2425bcb9 | 2071 | static int event_init(struct trace_event_call *call) |
8781915a EG |
2072 | { |
2073 | int ret = 0; | |
de7b2973 | 2074 | const char *name; |
8781915a | 2075 | |
687fcc4a | 2076 | name = trace_event_name(call); |
de7b2973 | 2077 | if (WARN_ON(!name)) |
8781915a EG |
2078 | return -EINVAL; |
2079 | ||
2080 | if (call->class->raw_init) { | |
2081 | ret = call->class->raw_init(call); | |
2082 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 2083 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
2084 | } |
2085 | ||
2086 | return ret; | |
2087 | } | |
2088 | ||
67ead0a6 | 2089 | static int |
2425bcb9 | 2090 | __register_event(struct trace_event_call *call, struct module *mod) |
bd1a5c84 | 2091 | { |
bd1a5c84 | 2092 | int ret; |
6d723736 | 2093 | |
8781915a EG |
2094 | ret = event_init(call); |
2095 | if (ret < 0) | |
2096 | return ret; | |
701970b3 | 2097 | |
ae63b31e | 2098 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 2099 | call->mod = mod; |
88f70d75 | 2100 | |
ae63b31e | 2101 | return 0; |
bd1a5c84 MH |
2102 | } |
2103 | ||
67ec0d85 | 2104 | static char *eval_replace(char *ptr, struct trace_eval_map *map, int len) |
0c564a53 SRRH |
2105 | { |
2106 | int rlen; | |
2107 | int elen; | |
2108 | ||
67ec0d85 | 2109 | /* Find the length of the eval value as a string */ |
00f4b652 | 2110 | elen = snprintf(ptr, 0, "%ld", map->eval_value); |
0c564a53 SRRH |
2111 | /* Make sure there's enough room to replace the string with the value */ |
2112 | if (len < elen) | |
2113 | return NULL; | |
2114 | ||
00f4b652 | 2115 | snprintf(ptr, elen + 1, "%ld", map->eval_value); |
0c564a53 SRRH |
2116 | |
2117 | /* Get the rest of the string of ptr */ | |
2118 | rlen = strlen(ptr + len); | |
2119 | memmove(ptr + elen, ptr + len, rlen); | |
2120 | /* Make sure we end the new string */ | |
2121 | ptr[elen + rlen] = 0; | |
2122 | ||
2123 | return ptr + elen; | |
2124 | } | |
2125 | ||
2425bcb9 | 2126 | static void update_event_printk(struct trace_event_call *call, |
00f4b652 | 2127 | struct trace_eval_map *map) |
0c564a53 SRRH |
2128 | { |
2129 | char *ptr; | |
2130 | int quote = 0; | |
00f4b652 | 2131 | int len = strlen(map->eval_string); |
0c564a53 SRRH |
2132 | |
2133 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
2134 | if (*ptr == '\\') { | |
2135 | ptr++; | |
2136 | /* paranoid */ | |
2137 | if (!*ptr) | |
2138 | break; | |
2139 | continue; | |
2140 | } | |
2141 | if (*ptr == '"') { | |
2142 | quote ^= 1; | |
2143 | continue; | |
2144 | } | |
2145 | if (quote) | |
2146 | continue; | |
2147 | if (isdigit(*ptr)) { | |
2148 | /* skip numbers */ | |
2149 | do { | |
2150 | ptr++; | |
2151 | /* Check for alpha chars like ULL */ | |
2152 | } while (isalnum(*ptr)); | |
3193899d SRRH |
2153 | if (!*ptr) |
2154 | break; | |
0c564a53 SRRH |
2155 | /* |
2156 | * A number must have some kind of delimiter after | |
2157 | * it, and we can ignore that too. | |
2158 | */ | |
2159 | continue; | |
2160 | } | |
2161 | if (isalpha(*ptr) || *ptr == '_') { | |
00f4b652 | 2162 | if (strncmp(map->eval_string, ptr, len) == 0 && |
0c564a53 | 2163 | !isalnum(ptr[len]) && ptr[len] != '_') { |
67ec0d85 JL |
2164 | ptr = eval_replace(ptr, map, len); |
2165 | /* enum/sizeof string smaller than value */ | |
0c564a53 SRRH |
2166 | if (WARN_ON_ONCE(!ptr)) |
2167 | return; | |
2168 | /* | |
67ec0d85 | 2169 | * No need to decrement here, as eval_replace() |
0c564a53 | 2170 | * returns the pointer to the character passed |
67ec0d85 | 2171 | * the eval, and two evals can not be placed |
0c564a53 SRRH |
2172 | * back to back without something in between. |
2173 | * We can skip that something in between. | |
2174 | */ | |
2175 | continue; | |
2176 | } | |
2177 | skip_more: | |
2178 | do { | |
2179 | ptr++; | |
2180 | } while (isalnum(*ptr) || *ptr == '_'); | |
3193899d SRRH |
2181 | if (!*ptr) |
2182 | break; | |
0c564a53 SRRH |
2183 | /* |
2184 | * If what comes after this variable is a '.' or | |
2185 | * '->' then we can continue to ignore that string. | |
2186 | */ | |
2187 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
2188 | ptr += *ptr == '.' ? 1 : 2; | |
3193899d SRRH |
2189 | if (!*ptr) |
2190 | break; | |
0c564a53 SRRH |
2191 | goto skip_more; |
2192 | } | |
2193 | /* | |
2194 | * Once again, we can skip the delimiter that came | |
2195 | * after the string. | |
2196 | */ | |
2197 | continue; | |
2198 | } | |
2199 | } | |
2200 | } | |
2201 | ||
f57a4143 | 2202 | void trace_event_eval_update(struct trace_eval_map **map, int len) |
0c564a53 | 2203 | { |
2425bcb9 | 2204 | struct trace_event_call *call, *p; |
0c564a53 | 2205 | const char *last_system = NULL; |
1ebe1eaf | 2206 | bool first = false; |
0c564a53 SRRH |
2207 | int last_i; |
2208 | int i; | |
2209 | ||
2210 | down_write(&trace_event_sem); | |
2211 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
2212 | /* events are usually grouped together with systems */ | |
2213 | if (!last_system || call->class->system != last_system) { | |
1ebe1eaf | 2214 | first = true; |
0c564a53 SRRH |
2215 | last_i = 0; |
2216 | last_system = call->class->system; | |
2217 | } | |
2218 | ||
1ebe1eaf SRV |
2219 | /* |
2220 | * Since calls are grouped by systems, the likelyhood that the | |
2221 | * next call in the iteration belongs to the same system as the | |
2222 | * previous call is high. As an optimization, we skip seaching | |
2223 | * for a map[] that matches the call's system if the last call | |
2224 | * was from the same system. That's what last_i is for. If the | |
2225 | * call has the same system as the previous call, then last_i | |
2226 | * will be the index of the first map[] that has a matching | |
2227 | * system. | |
2228 | */ | |
0c564a53 SRRH |
2229 | for (i = last_i; i < len; i++) { |
2230 | if (call->class->system == map[i]->system) { | |
2231 | /* Save the first system if need be */ | |
1ebe1eaf | 2232 | if (first) { |
0c564a53 | 2233 | last_i = i; |
1ebe1eaf SRV |
2234 | first = false; |
2235 | } | |
0c564a53 SRRH |
2236 | update_event_printk(call, map[i]); |
2237 | } | |
2238 | } | |
2239 | } | |
2240 | up_write(&trace_event_sem); | |
2241 | } | |
2242 | ||
7f1d2f82 | 2243 | static struct trace_event_file * |
2425bcb9 | 2244 | trace_create_new_event(struct trace_event_call *call, |
da511bf3 SRRH |
2245 | struct trace_array *tr) |
2246 | { | |
7f1d2f82 | 2247 | struct trace_event_file *file; |
da511bf3 SRRH |
2248 | |
2249 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
2250 | if (!file) | |
2251 | return NULL; | |
2252 | ||
2253 | file->event_call = call; | |
2254 | file->tr = tr; | |
2255 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
2256 | atomic_set(&file->tm_ref, 0); |
2257 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
2258 | list_add(&file->list, &tr->events); |
2259 | ||
2260 | return file; | |
2261 | } | |
2262 | ||
ae63b31e SR |
2263 | /* Add an event to a trace directory */ |
2264 | static int | |
2425bcb9 | 2265 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) |
ae63b31e | 2266 | { |
7f1d2f82 | 2267 | struct trace_event_file *file; |
ae63b31e | 2268 | |
da511bf3 | 2269 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
2270 | if (!file) |
2271 | return -ENOMEM; | |
2272 | ||
620a30e9 | 2273 | return event_create_dir(tr->event_dir, file); |
ae63b31e SR |
2274 | } |
2275 | ||
77248221 SR |
2276 | /* |
2277 | * Just create a decriptor for early init. A descriptor is required | |
2278 | * for enabling events at boot. We want to enable events before | |
2279 | * the filesystem is initialized. | |
2280 | */ | |
2281 | static __init int | |
2425bcb9 | 2282 | __trace_early_add_new_event(struct trace_event_call *call, |
77248221 SR |
2283 | struct trace_array *tr) |
2284 | { | |
7f1d2f82 | 2285 | struct trace_event_file *file; |
77248221 | 2286 | |
da511bf3 | 2287 | file = trace_create_new_event(call, tr); |
77248221 SR |
2288 | if (!file) |
2289 | return -ENOMEM; | |
2290 | ||
77248221 SR |
2291 | return 0; |
2292 | } | |
2293 | ||
ae63b31e | 2294 | struct ftrace_module_file_ops; |
2425bcb9 | 2295 | static void __add_event_to_tracers(struct trace_event_call *call); |
ae63b31e | 2296 | |
7e1413ed SRV |
2297 | /* Add an additional event_call dynamically */ |
2298 | int trace_add_event_call(struct trace_event_call *call) | |
bd1a5c84 MH |
2299 | { |
2300 | int ret; | |
fc800a10 MH |
2301 | lockdep_assert_held(&event_mutex); |
2302 | ||
12ecef0c | 2303 | mutex_lock(&trace_types_lock); |
701970b3 | 2304 | |
ae63b31e SR |
2305 | ret = __register_event(call, NULL); |
2306 | if (ret >= 0) | |
779c5e37 | 2307 | __add_event_to_tracers(call); |
a2ca5e03 | 2308 | |
a8227415 | 2309 | mutex_unlock(&trace_types_lock); |
fc800a10 MH |
2310 | return ret; |
2311 | } | |
2312 | ||
4fead8e4 | 2313 | /* |
a8227415 AL |
2314 | * Must be called under locking of trace_types_lock, event_mutex and |
2315 | * trace_event_sem. | |
4fead8e4 | 2316 | */ |
2425bcb9 | 2317 | static void __trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2318 | { |
8781915a | 2319 | event_remove(call); |
bd1a5c84 | 2320 | trace_destroy_fields(call); |
57375747 ON |
2321 | free_event_filter(call->filter); |
2322 | call->filter = NULL; | |
bd1a5c84 MH |
2323 | } |
2324 | ||
2425bcb9 | 2325 | static int probe_remove_event_call(struct trace_event_call *call) |
2816c551 ON |
2326 | { |
2327 | struct trace_array *tr; | |
7f1d2f82 | 2328 | struct trace_event_file *file; |
2816c551 ON |
2329 | |
2330 | #ifdef CONFIG_PERF_EVENTS | |
2331 | if (call->perf_refcount) | |
2332 | return -EBUSY; | |
2333 | #endif | |
2334 | do_for_each_event_file(tr, file) { | |
2335 | if (file->event_call != call) | |
2336 | continue; | |
2337 | /* | |
2338 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
5d6ad960 | 2339 | * we are going to do, EVENT_FILE_FL_SOFT_MODE can suppress |
2816c551 ON |
2340 | * TRACE_REG_UNREGISTER. |
2341 | */ | |
5d6ad960 | 2342 | if (file->flags & EVENT_FILE_FL_ENABLED) |
2816c551 | 2343 | return -EBUSY; |
2ba64035 SRRH |
2344 | /* |
2345 | * The do_for_each_event_file_safe() is | |
2346 | * a double loop. After finding the call for this | |
2347 | * trace_array, we use break to jump to the next | |
2348 | * trace_array. | |
2349 | */ | |
2816c551 ON |
2350 | break; |
2351 | } while_for_each_event_file(); | |
2352 | ||
2353 | __trace_remove_event_call(call); | |
2354 | ||
2355 | return 0; | |
2356 | } | |
2357 | ||
7e1413ed SRV |
2358 | /* Remove an event_call */ |
2359 | int trace_remove_event_call(struct trace_event_call *call) | |
bd1a5c84 | 2360 | { |
2816c551 ON |
2361 | int ret; |
2362 | ||
fc800a10 MH |
2363 | lockdep_assert_held(&event_mutex); |
2364 | ||
12ecef0c | 2365 | mutex_lock(&trace_types_lock); |
52f6ad6d | 2366 | down_write(&trace_event_sem); |
2816c551 | 2367 | ret = probe_remove_event_call(call); |
52f6ad6d | 2368 | up_write(&trace_event_sem); |
a8227415 | 2369 | mutex_unlock(&trace_types_lock); |
fc800a10 MH |
2370 | |
2371 | return ret; | |
2372 | } | |
2373 | ||
bd1a5c84 MH |
2374 | #define for_each_event(event, start, end) \ |
2375 | for (event = start; \ | |
2376 | (unsigned long)event < (unsigned long)end; \ | |
2377 | event++) | |
2378 | ||
2379 | #ifdef CONFIG_MODULES | |
2380 | ||
6d723736 SR |
2381 | static void trace_module_add_events(struct module *mod) |
2382 | { | |
2425bcb9 | 2383 | struct trace_event_call **call, **start, **end; |
6d723736 | 2384 | |
45ab2813 SRRH |
2385 | if (!mod->num_trace_events) |
2386 | return; | |
2387 | ||
2388 | /* Don't add infrastructure for mods without tracepoints */ | |
2389 | if (trace_module_has_bad_taint(mod)) { | |
2390 | pr_err("%s: module has bad taint, not creating trace events\n", | |
2391 | mod->name); | |
2392 | return; | |
2393 | } | |
2394 | ||
6d723736 SR |
2395 | start = mod->trace_events; |
2396 | end = mod->trace_events + mod->num_trace_events; | |
2397 | ||
6d723736 | 2398 | for_each_event(call, start, end) { |
ae63b31e | 2399 | __register_event(*call, mod); |
779c5e37 | 2400 | __add_event_to_tracers(*call); |
6d723736 SR |
2401 | } |
2402 | } | |
2403 | ||
2404 | static void trace_module_remove_events(struct module *mod) | |
2405 | { | |
2425bcb9 | 2406 | struct trace_event_call *call, *p; |
6d723736 | 2407 | |
52f6ad6d | 2408 | down_write(&trace_event_sem); |
6d723736 | 2409 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
065e63f9 | 2410 | if (call->mod == mod) |
bd1a5c84 | 2411 | __trace_remove_event_call(call); |
6d723736 | 2412 | } |
52f6ad6d | 2413 | up_write(&trace_event_sem); |
9456f0fa SR |
2414 | |
2415 | /* | |
2416 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
2417 | * registered any events that were used. The only worry is if |
2418 | * a new module gets loaded, and takes on the same id as the events | |
2419 | * of this module. When printing out the buffer, traced events left | |
2420 | * over from this module may be passed to the new module events and | |
2421 | * unexpected results may occur. | |
9456f0fa | 2422 | */ |
065e63f9 | 2423 | tracing_reset_all_online_cpus(); |
6d723736 SR |
2424 | } |
2425 | ||
61f919a1 SR |
2426 | static int trace_module_notify(struct notifier_block *self, |
2427 | unsigned long val, void *data) | |
6d723736 SR |
2428 | { |
2429 | struct module *mod = data; | |
2430 | ||
2431 | mutex_lock(&event_mutex); | |
12ecef0c | 2432 | mutex_lock(&trace_types_lock); |
6d723736 SR |
2433 | switch (val) { |
2434 | case MODULE_STATE_COMING: | |
2435 | trace_module_add_events(mod); | |
2436 | break; | |
2437 | case MODULE_STATE_GOING: | |
2438 | trace_module_remove_events(mod); | |
2439 | break; | |
2440 | } | |
a8227415 | 2441 | mutex_unlock(&trace_types_lock); |
12ecef0c | 2442 | mutex_unlock(&event_mutex); |
fd994989 | 2443 | |
1473e441 SR |
2444 | return 0; |
2445 | } | |
315326c1 | 2446 | |
836d481e ON |
2447 | static struct notifier_block trace_module_nb = { |
2448 | .notifier_call = trace_module_notify, | |
3673b8e4 | 2449 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 2450 | }; |
61f919a1 | 2451 | #endif /* CONFIG_MODULES */ |
1473e441 | 2452 | |
ae63b31e SR |
2453 | /* Create a new event directory structure for a trace directory. */ |
2454 | static void | |
2455 | __trace_add_event_dirs(struct trace_array *tr) | |
2456 | { | |
2425bcb9 | 2457 | struct trace_event_call *call; |
ae63b31e SR |
2458 | int ret; |
2459 | ||
2460 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 2461 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 2462 | if (ret < 0) |
3448bac3 | 2463 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2464 | trace_event_name(call)); |
ae63b31e SR |
2465 | } |
2466 | } | |
2467 | ||
3c96529c | 2468 | /* Returns any file that matches the system and event */ |
7f1d2f82 | 2469 | struct trace_event_file * |
3c96529c | 2470 | __find_event_file(struct trace_array *tr, const char *system, const char *event) |
3cd715de | 2471 | { |
7f1d2f82 | 2472 | struct trace_event_file *file; |
2425bcb9 | 2473 | struct trace_event_call *call; |
de7b2973 | 2474 | const char *name; |
3cd715de SRRH |
2475 | |
2476 | list_for_each_entry(file, &tr->events, list) { | |
2477 | ||
2478 | call = file->event_call; | |
687fcc4a | 2479 | name = trace_event_name(call); |
3cd715de | 2480 | |
3c96529c | 2481 | if (!name || !call->class) |
3cd715de SRRH |
2482 | continue; |
2483 | ||
de7b2973 | 2484 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
2485 | strcmp(system, call->class->system) == 0) |
2486 | return file; | |
2487 | } | |
2488 | return NULL; | |
2489 | } | |
2490 | ||
3c96529c SRV |
2491 | /* Returns valid trace event files that match system and event */ |
2492 | struct trace_event_file * | |
2493 | find_event_file(struct trace_array *tr, const char *system, const char *event) | |
2494 | { | |
2495 | struct trace_event_file *file; | |
2496 | ||
2497 | file = __find_event_file(tr, system, event); | |
2498 | if (!file || !file->event_call->class->reg || | |
2499 | file->event_call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2500 | return NULL; | |
2501 | ||
2502 | return file; | |
2503 | } | |
2504 | ||
2875a08b SRRH |
2505 | #ifdef CONFIG_DYNAMIC_FTRACE |
2506 | ||
2507 | /* Avoid typos */ | |
2508 | #define ENABLE_EVENT_STR "enable_event" | |
2509 | #define DISABLE_EVENT_STR "disable_event" | |
2510 | ||
2511 | struct event_probe_data { | |
7f1d2f82 | 2512 | struct trace_event_file *file; |
2875a08b SRRH |
2513 | unsigned long count; |
2514 | int ref; | |
2515 | bool enable; | |
2516 | }; | |
2517 | ||
41794f19 SRV |
2518 | static void update_event_probe(struct event_probe_data *data) |
2519 | { | |
2520 | if (data->enable) | |
2521 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2522 | else | |
2523 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); | |
2524 | } | |
2525 | ||
3cd715de | 2526 | static void |
bca6c8d0 | 2527 | event_enable_probe(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 2528 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 2529 | void *data) |
3cd715de | 2530 | { |
6e444319 SRV |
2531 | struct ftrace_func_mapper *mapper = data; |
2532 | struct event_probe_data *edata; | |
41794f19 | 2533 | void **pdata; |
3cd715de | 2534 | |
41794f19 SRV |
2535 | pdata = ftrace_func_mapper_find_ip(mapper, ip); |
2536 | if (!pdata || !*pdata) | |
3cd715de SRRH |
2537 | return; |
2538 | ||
6e444319 SRV |
2539 | edata = *pdata; |
2540 | update_event_probe(edata); | |
3cd715de SRRH |
2541 | } |
2542 | ||
2543 | static void | |
bca6c8d0 | 2544 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, |
b5f081b5 | 2545 | struct trace_array *tr, struct ftrace_probe_ops *ops, |
6e444319 | 2546 | void *data) |
3cd715de | 2547 | { |
6e444319 SRV |
2548 | struct ftrace_func_mapper *mapper = data; |
2549 | struct event_probe_data *edata; | |
41794f19 | 2550 | void **pdata; |
3cd715de | 2551 | |
41794f19 SRV |
2552 | pdata = ftrace_func_mapper_find_ip(mapper, ip); |
2553 | if (!pdata || !*pdata) | |
3cd715de SRRH |
2554 | return; |
2555 | ||
6e444319 | 2556 | edata = *pdata; |
41794f19 | 2557 | |
6e444319 | 2558 | if (!edata->count) |
3cd715de SRRH |
2559 | return; |
2560 | ||
2561 | /* Skip if the event is in a state we want to switch to */ | |
6e444319 | 2562 | if (edata->enable == !(edata->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
3cd715de SRRH |
2563 | return; |
2564 | ||
6e444319 SRV |
2565 | if (edata->count != -1) |
2566 | (edata->count)--; | |
3cd715de | 2567 | |
6e444319 | 2568 | update_event_probe(edata); |
3cd715de SRRH |
2569 | } |
2570 | ||
2571 | static int | |
2572 | event_enable_print(struct seq_file *m, unsigned long ip, | |
6e444319 | 2573 | struct ftrace_probe_ops *ops, void *data) |
3cd715de | 2574 | { |
6e444319 SRV |
2575 | struct ftrace_func_mapper *mapper = data; |
2576 | struct event_probe_data *edata; | |
41794f19 SRV |
2577 | void **pdata; |
2578 | ||
2579 | pdata = ftrace_func_mapper_find_ip(mapper, ip); | |
2580 | ||
2581 | if (WARN_ON_ONCE(!pdata || !*pdata)) | |
2582 | return 0; | |
2583 | ||
6e444319 | 2584 | edata = *pdata; |
3cd715de SRRH |
2585 | |
2586 | seq_printf(m, "%ps:", (void *)ip); | |
2587 | ||
2588 | seq_printf(m, "%s:%s:%s", | |
6e444319 SRV |
2589 | edata->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, |
2590 | edata->file->event_call->class->system, | |
2591 | trace_event_name(edata->file->event_call)); | |
3cd715de | 2592 | |
6e444319 | 2593 | if (edata->count == -1) |
fa6f0cc7 | 2594 | seq_puts(m, ":unlimited\n"); |
3cd715de | 2595 | else |
6e444319 | 2596 | seq_printf(m, ":count=%ld\n", edata->count); |
3cd715de SRRH |
2597 | |
2598 | return 0; | |
2599 | } | |
2600 | ||
2601 | static int | |
b5f081b5 | 2602 | event_enable_init(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 2603 | unsigned long ip, void *init_data, void **data) |
3cd715de | 2604 | { |
6e444319 SRV |
2605 | struct ftrace_func_mapper *mapper = *data; |
2606 | struct event_probe_data *edata = init_data; | |
41794f19 SRV |
2607 | int ret; |
2608 | ||
6e444319 SRV |
2609 | if (!mapper) { |
2610 | mapper = allocate_ftrace_func_mapper(); | |
2611 | if (!mapper) | |
2612 | return -ENODEV; | |
2613 | *data = mapper; | |
2614 | } | |
2615 | ||
2616 | ret = ftrace_func_mapper_add_ip(mapper, ip, edata); | |
41794f19 SRV |
2617 | if (ret < 0) |
2618 | return ret; | |
3cd715de | 2619 | |
6e444319 SRV |
2620 | edata->ref++; |
2621 | ||
2622 | return 0; | |
2623 | } | |
2624 | ||
2625 | static int free_probe_data(void *data) | |
2626 | { | |
2627 | struct event_probe_data *edata = data; | |
41794f19 | 2628 | |
6e444319 SRV |
2629 | edata->ref--; |
2630 | if (!edata->ref) { | |
2631 | /* Remove the SOFT_MODE flag */ | |
2632 | __ftrace_event_enable_disable(edata->file, 0, 1); | |
2633 | module_put(edata->file->event_call->mod); | |
2634 | kfree(edata); | |
2635 | } | |
3cd715de SRRH |
2636 | return 0; |
2637 | } | |
2638 | ||
2639 | static void | |
b5f081b5 | 2640 | event_enable_free(struct ftrace_probe_ops *ops, struct trace_array *tr, |
6e444319 | 2641 | unsigned long ip, void *data) |
3cd715de | 2642 | { |
6e444319 SRV |
2643 | struct ftrace_func_mapper *mapper = data; |
2644 | struct event_probe_data *edata; | |
2645 | ||
2646 | if (!ip) { | |
2647 | if (!mapper) | |
2648 | return; | |
2649 | free_ftrace_func_mapper(mapper, free_probe_data); | |
2650 | return; | |
2651 | } | |
41794f19 | 2652 | |
6e444319 | 2653 | edata = ftrace_func_mapper_remove_ip(mapper, ip); |
41794f19 | 2654 | |
6e444319 | 2655 | if (WARN_ON_ONCE(!edata)) |
41794f19 | 2656 | return; |
3cd715de | 2657 | |
6e444319 | 2658 | if (WARN_ON_ONCE(edata->ref <= 0)) |
3cd715de SRRH |
2659 | return; |
2660 | ||
6e444319 | 2661 | free_probe_data(edata); |
3cd715de SRRH |
2662 | } |
2663 | ||
2664 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2665 | .func = event_enable_probe, | |
2666 | .print = event_enable_print, | |
2667 | .init = event_enable_init, | |
2668 | .free = event_enable_free, | |
2669 | }; | |
2670 | ||
2671 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
2672 | .func = event_enable_count_probe, | |
2673 | .print = event_enable_print, | |
2674 | .init = event_enable_init, | |
2675 | .free = event_enable_free, | |
2676 | }; | |
2677 | ||
2678 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
2679 | .func = event_enable_probe, | |
2680 | .print = event_enable_print, | |
2681 | .init = event_enable_init, | |
2682 | .free = event_enable_free, | |
2683 | }; | |
2684 | ||
2685 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2686 | .func = event_enable_count_probe, | |
2687 | .print = event_enable_print, | |
2688 | .init = event_enable_init, | |
2689 | .free = event_enable_free, | |
2690 | }; | |
2691 | ||
2692 | static int | |
04ec7bb6 | 2693 | event_enable_func(struct trace_array *tr, struct ftrace_hash *hash, |
3cd715de SRRH |
2694 | char *glob, char *cmd, char *param, int enabled) |
2695 | { | |
7f1d2f82 | 2696 | struct trace_event_file *file; |
3cd715de SRRH |
2697 | struct ftrace_probe_ops *ops; |
2698 | struct event_probe_data *data; | |
2699 | const char *system; | |
2700 | const char *event; | |
2701 | char *number; | |
2702 | bool enable; | |
2703 | int ret; | |
2704 | ||
dc81e5e3 YY |
2705 | if (!tr) |
2706 | return -ENODEV; | |
2707 | ||
3cd715de | 2708 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 2709 | if (!enabled || !param) |
3cd715de SRRH |
2710 | return -EINVAL; |
2711 | ||
2712 | system = strsep(¶m, ":"); | |
2713 | if (!param) | |
2714 | return -EINVAL; | |
2715 | ||
2716 | event = strsep(¶m, ":"); | |
2717 | ||
2718 | mutex_lock(&event_mutex); | |
2719 | ||
2720 | ret = -EINVAL; | |
2721 | file = find_event_file(tr, system, event); | |
2722 | if (!file) | |
2723 | goto out; | |
2724 | ||
2725 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2726 | ||
2727 | if (enable) | |
2728 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2729 | else | |
2730 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2731 | ||
2732 | if (glob[0] == '!') { | |
7b60f3d8 | 2733 | ret = unregister_ftrace_function_probe_func(glob+1, tr, ops); |
3cd715de SRRH |
2734 | goto out; |
2735 | } | |
2736 | ||
2737 | ret = -ENOMEM; | |
41794f19 | 2738 | |
3cd715de SRRH |
2739 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
2740 | if (!data) | |
2741 | goto out; | |
2742 | ||
2743 | data->enable = enable; | |
2744 | data->count = -1; | |
2745 | data->file = file; | |
2746 | ||
2747 | if (!param) | |
2748 | goto out_reg; | |
2749 | ||
2750 | number = strsep(¶m, ":"); | |
2751 | ||
2752 | ret = -EINVAL; | |
2753 | if (!strlen(number)) | |
2754 | goto out_free; | |
2755 | ||
2756 | /* | |
2757 | * We use the callback data field (which is a pointer) | |
2758 | * as our counter. | |
2759 | */ | |
2760 | ret = kstrtoul(number, 0, &data->count); | |
2761 | if (ret) | |
2762 | goto out_free; | |
2763 | ||
2764 | out_reg: | |
2765 | /* Don't let event modules unload while probe registered */ | |
2766 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2767 | if (!ret) { |
2768 | ret = -EBUSY; | |
3cd715de | 2769 | goto out_free; |
6ed01066 | 2770 | } |
3cd715de SRRH |
2771 | |
2772 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2773 | if (ret < 0) | |
2774 | goto out_put; | |
41794f19 | 2775 | |
04ec7bb6 | 2776 | ret = register_ftrace_function_probe(glob, tr, ops, data); |
ff305ded SRRH |
2777 | /* |
2778 | * The above returns on success the # of functions enabled, | |
2779 | * but if it didn't find any functions it returns zero. | |
2780 | * Consider no functions a failure too. | |
2781 | */ | |
a5b85bd1 MH |
2782 | if (!ret) { |
2783 | ret = -ENOENT; | |
3cd715de | 2784 | goto out_disable; |
ff305ded SRRH |
2785 | } else if (ret < 0) |
2786 | goto out_disable; | |
2787 | /* Just return zero, not the number of enabled functions */ | |
2788 | ret = 0; | |
3cd715de SRRH |
2789 | out: |
2790 | mutex_unlock(&event_mutex); | |
2791 | return ret; | |
2792 | ||
2793 | out_disable: | |
2794 | __ftrace_event_enable_disable(file, 0, 1); | |
2795 | out_put: | |
2796 | module_put(file->event_call->mod); | |
2797 | out_free: | |
2798 | kfree(data); | |
2799 | goto out; | |
2800 | } | |
2801 | ||
2802 | static struct ftrace_func_command event_enable_cmd = { | |
2803 | .name = ENABLE_EVENT_STR, | |
2804 | .func = event_enable_func, | |
2805 | }; | |
2806 | ||
2807 | static struct ftrace_func_command event_disable_cmd = { | |
2808 | .name = DISABLE_EVENT_STR, | |
2809 | .func = event_enable_func, | |
2810 | }; | |
2811 | ||
2812 | static __init int register_event_cmds(void) | |
2813 | { | |
2814 | int ret; | |
2815 | ||
2816 | ret = register_ftrace_command(&event_enable_cmd); | |
2817 | if (WARN_ON(ret < 0)) | |
2818 | return ret; | |
2819 | ret = register_ftrace_command(&event_disable_cmd); | |
2820 | if (WARN_ON(ret < 0)) | |
2821 | unregister_ftrace_command(&event_enable_cmd); | |
2822 | return ret; | |
2823 | } | |
2824 | #else | |
2825 | static inline int register_event_cmds(void) { return 0; } | |
2826 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2827 | ||
77248221 | 2828 | /* |
7f1d2f82 | 2829 | * The top level array has already had its trace_event_file |
77248221 | 2830 | * descriptors created in order to allow for early events to |
8434dc93 | 2831 | * be recorded. This function is called after the tracefs has been |
77248221 SR |
2832 | * initialized, and we now have to create the files associated |
2833 | * to the events. | |
2834 | */ | |
2835 | static __init void | |
2836 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2837 | { | |
7f1d2f82 | 2838 | struct trace_event_file *file; |
77248221 SR |
2839 | int ret; |
2840 | ||
2841 | ||
2842 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 2843 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 2844 | if (ret < 0) |
3448bac3 | 2845 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2846 | trace_event_name(file->event_call)); |
77248221 SR |
2847 | } |
2848 | } | |
2849 | ||
2850 | /* | |
2851 | * For early boot up, the top trace array requires to have | |
2852 | * a list of events that can be enabled. This must be done before | |
2853 | * the filesystem is set up in order to allow events to be traced | |
2854 | * early. | |
2855 | */ | |
2856 | static __init void | |
2857 | __trace_early_add_events(struct trace_array *tr) | |
2858 | { | |
2425bcb9 | 2859 | struct trace_event_call *call; |
77248221 SR |
2860 | int ret; |
2861 | ||
2862 | list_for_each_entry(call, &ftrace_events, list) { | |
2863 | /* Early boot up should not have any modules loaded */ | |
2864 | if (WARN_ON_ONCE(call->mod)) | |
2865 | continue; | |
2866 | ||
2867 | ret = __trace_early_add_new_event(call, tr); | |
2868 | if (ret < 0) | |
3448bac3 | 2869 | pr_warn("Could not create early event %s\n", |
687fcc4a | 2870 | trace_event_name(call)); |
77248221 SR |
2871 | } |
2872 | } | |
2873 | ||
0c8916c3 SR |
2874 | /* Remove the event directory structure for a trace directory. */ |
2875 | static void | |
2876 | __trace_remove_event_dirs(struct trace_array *tr) | |
2877 | { | |
7f1d2f82 | 2878 | struct trace_event_file *file, *next; |
0c8916c3 | 2879 | |
f6a84bdc ON |
2880 | list_for_each_entry_safe(file, next, &tr->events, list) |
2881 | remove_event_file_dir(file); | |
0c8916c3 SR |
2882 | } |
2883 | ||
2425bcb9 | 2884 | static void __add_event_to_tracers(struct trace_event_call *call) |
ae63b31e SR |
2885 | { |
2886 | struct trace_array *tr; | |
2887 | ||
620a30e9 ON |
2888 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
2889 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
2890 | } |
2891 | ||
2425bcb9 SRRH |
2892 | extern struct trace_event_call *__start_ftrace_events[]; |
2893 | extern struct trace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2894 | |
020e5f85 LZ |
2895 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2896 | ||
2897 | static __init int setup_trace_event(char *str) | |
2898 | { | |
2899 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2900 | ring_buffer_expanded = true; |
2901 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2902 | |
2903 | return 1; | |
2904 | } | |
2905 | __setup("trace_event=", setup_trace_event); | |
2906 | ||
77248221 SR |
2907 | /* Expects to have event_mutex held when called */ |
2908 | static int | |
2909 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2910 | { |
2911 | struct dentry *d_events; | |
2912 | struct dentry *entry; | |
2913 | ||
8434dc93 | 2914 | entry = tracefs_create_file("set_event", 0644, parent, |
ae63b31e SR |
2915 | tr, &ftrace_set_event_fops); |
2916 | if (!entry) { | |
8434dc93 | 2917 | pr_warn("Could not create tracefs 'set_event' entry\n"); |
ae63b31e SR |
2918 | return -ENOMEM; |
2919 | } | |
2920 | ||
8434dc93 | 2921 | d_events = tracefs_create_dir("events", parent); |
277ba044 | 2922 | if (!d_events) { |
8434dc93 | 2923 | pr_warn("Could not create tracefs 'events' directory\n"); |
277ba044 SR |
2924 | return -ENOMEM; |
2925 | } | |
ae63b31e | 2926 | |
7d436400 SRRH |
2927 | entry = trace_create_file("enable", 0644, d_events, |
2928 | tr, &ftrace_tr_enable_fops); | |
2929 | if (!entry) { | |
2930 | pr_warn("Could not create tracefs 'enable' entry\n"); | |
2931 | return -ENOMEM; | |
2932 | } | |
2933 | ||
2934 | /* There are not as crucial, just warn if they are not created */ | |
2935 | ||
49090107 SRRH |
2936 | entry = tracefs_create_file("set_event_pid", 0644, parent, |
2937 | tr, &ftrace_set_event_pid_fops); | |
7d436400 SRRH |
2938 | if (!entry) |
2939 | pr_warn("Could not create tracefs 'set_event_pid' entry\n"); | |
49090107 | 2940 | |
ae63b31e | 2941 | /* ring buffer internal formats */ |
7d436400 SRRH |
2942 | entry = trace_create_file("header_page", 0444, d_events, |
2943 | ring_buffer_print_page_header, | |
2944 | &ftrace_show_header_fops); | |
2945 | if (!entry) | |
2946 | pr_warn("Could not create tracefs 'header_page' entry\n"); | |
2947 | ||
2948 | entry = trace_create_file("header_event", 0444, d_events, | |
2949 | ring_buffer_print_entry_header, | |
2950 | &ftrace_show_header_fops); | |
2951 | if (!entry) | |
2952 | pr_warn("Could not create tracefs 'header_event' entry\n"); | |
ae63b31e SR |
2953 | |
2954 | tr->event_dir = d_events; | |
77248221 SR |
2955 | |
2956 | return 0; | |
2957 | } | |
2958 | ||
2959 | /** | |
2960 | * event_trace_add_tracer - add a instance of a trace_array to events | |
2961 | * @parent: The parent dentry to place the files/directories for events in | |
2962 | * @tr: The trace array associated with these events | |
2963 | * | |
2964 | * When a new instance is created, it needs to set up its events | |
2965 | * directory, as well as other files associated with events. It also | |
2966 | * creates the event hierachry in the @parent/events directory. | |
2967 | * | |
2968 | * Returns 0 on success. | |
12ecef0c SRV |
2969 | * |
2970 | * Must be called with event_mutex held. | |
77248221 SR |
2971 | */ |
2972 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2973 | { | |
2974 | int ret; | |
2975 | ||
12ecef0c | 2976 | lockdep_assert_held(&event_mutex); |
77248221 SR |
2977 | |
2978 | ret = create_event_toplevel_files(parent, tr); | |
2979 | if (ret) | |
12ecef0c | 2980 | goto out; |
77248221 | 2981 | |
52f6ad6d | 2982 | down_write(&trace_event_sem); |
ae63b31e | 2983 | __trace_add_event_dirs(tr); |
52f6ad6d | 2984 | up_write(&trace_event_sem); |
277ba044 | 2985 | |
12ecef0c | 2986 | out: |
77248221 SR |
2987 | return ret; |
2988 | } | |
2989 | ||
2990 | /* | |
2991 | * The top trace array already had its file descriptors created. | |
2992 | * Now the files themselves need to be created. | |
2993 | */ | |
2994 | static __init int | |
2995 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
2996 | { | |
2997 | int ret; | |
2998 | ||
2999 | mutex_lock(&event_mutex); | |
3000 | ||
3001 | ret = create_event_toplevel_files(parent, tr); | |
3002 | if (ret) | |
3003 | goto out_unlock; | |
3004 | ||
52f6ad6d | 3005 | down_write(&trace_event_sem); |
77248221 | 3006 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 3007 | up_write(&trace_event_sem); |
77248221 SR |
3008 | |
3009 | out_unlock: | |
3010 | mutex_unlock(&event_mutex); | |
3011 | ||
3012 | return ret; | |
ae63b31e SR |
3013 | } |
3014 | ||
12ecef0c | 3015 | /* Must be called with event_mutex held */ |
0c8916c3 SR |
3016 | int event_trace_del_tracer(struct trace_array *tr) |
3017 | { | |
12ecef0c | 3018 | lockdep_assert_held(&event_mutex); |
0c8916c3 | 3019 | |
85f2b082 TZ |
3020 | /* Disable any event triggers and associated soft-disabled events */ |
3021 | clear_event_triggers(tr); | |
3022 | ||
49090107 SRRH |
3023 | /* Clear the pid list */ |
3024 | __ftrace_clear_event_pids(tr); | |
3025 | ||
2a6c24af SRRH |
3026 | /* Disable any running events */ |
3027 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
3028 | ||
e0a568dc SRV |
3029 | /* Make sure no more events are being executed */ |
3030 | tracepoint_synchronize_unregister(); | |
3ccb0123 | 3031 | |
52f6ad6d | 3032 | down_write(&trace_event_sem); |
0c8916c3 | 3033 | __trace_remove_event_dirs(tr); |
8434dc93 | 3034 | tracefs_remove_recursive(tr->event_dir); |
52f6ad6d | 3035 | up_write(&trace_event_sem); |
0c8916c3 SR |
3036 | |
3037 | tr->event_dir = NULL; | |
3038 | ||
0c8916c3 SR |
3039 | return 0; |
3040 | } | |
3041 | ||
d1a29143 SR |
3042 | static __init int event_trace_memsetup(void) |
3043 | { | |
3044 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
7f1d2f82 | 3045 | file_cachep = KMEM_CACHE(trace_event_file, SLAB_PANIC); |
d1a29143 SR |
3046 | return 0; |
3047 | } | |
3048 | ||
ce1039bd SRRH |
3049 | static __init void |
3050 | early_enable_events(struct trace_array *tr, bool disable_first) | |
3051 | { | |
3052 | char *buf = bootup_event_buf; | |
3053 | char *token; | |
3054 | int ret; | |
3055 | ||
3056 | while (true) { | |
3057 | token = strsep(&buf, ","); | |
3058 | ||
3059 | if (!token) | |
3060 | break; | |
ce1039bd | 3061 | |
43ed3843 SRRH |
3062 | if (*token) { |
3063 | /* Restarting syscalls requires that we stop them first */ | |
3064 | if (disable_first) | |
3065 | ftrace_set_clr_event(tr, token, 0); | |
ce1039bd | 3066 | |
43ed3843 SRRH |
3067 | ret = ftrace_set_clr_event(tr, token, 1); |
3068 | if (ret) | |
3069 | pr_warn("Failed to enable trace event: %s\n", token); | |
3070 | } | |
ce1039bd SRRH |
3071 | |
3072 | /* Put back the comma to allow this to be called again */ | |
3073 | if (buf) | |
3074 | *(buf - 1) = ','; | |
3075 | } | |
3076 | } | |
3077 | ||
8781915a EG |
3078 | static __init int event_trace_enable(void) |
3079 | { | |
ae63b31e | 3080 | struct trace_array *tr = top_trace_array(); |
2425bcb9 | 3081 | struct trace_event_call **iter, *call; |
8781915a EG |
3082 | int ret; |
3083 | ||
dc81e5e3 YY |
3084 | if (!tr) |
3085 | return -ENODEV; | |
3086 | ||
8781915a EG |
3087 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
3088 | ||
3089 | call = *iter; | |
3090 | ret = event_init(call); | |
3091 | if (!ret) | |
3092 | list_add(&call->list, &ftrace_events); | |
3093 | } | |
3094 | ||
77248221 SR |
3095 | /* |
3096 | * We need the top trace array to have a working set of trace | |
3097 | * points at early init, before the debug files and directories | |
3098 | * are created. Create the file entries now, and attach them | |
3099 | * to the actual file dentries later. | |
3100 | */ | |
3101 | __trace_early_add_events(tr); | |
3102 | ||
ce1039bd | 3103 | early_enable_events(tr, false); |
81698831 SR |
3104 | |
3105 | trace_printk_start_comm(); | |
3106 | ||
3cd715de SRRH |
3107 | register_event_cmds(); |
3108 | ||
85f2b082 TZ |
3109 | register_trigger_cmds(); |
3110 | ||
8781915a EG |
3111 | return 0; |
3112 | } | |
3113 | ||
ce1039bd SRRH |
3114 | /* |
3115 | * event_trace_enable() is called from trace_event_init() first to | |
3116 | * initialize events and perhaps start any events that are on the | |
3117 | * command line. Unfortunately, there are some events that will not | |
3118 | * start this early, like the system call tracepoints that need | |
3119 | * to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable() | |
3120 | * is called before pid 1 starts, and this flag is never set, making | |
3121 | * the syscall tracepoint never get reached, but the event is enabled | |
3122 | * regardless (and not doing anything). | |
3123 | */ | |
3124 | static __init int event_trace_enable_again(void) | |
3125 | { | |
3126 | struct trace_array *tr; | |
3127 | ||
3128 | tr = top_trace_array(); | |
3129 | if (!tr) | |
3130 | return -ENODEV; | |
3131 | ||
3132 | early_enable_events(tr, true); | |
3133 | ||
3134 | return 0; | |
3135 | } | |
3136 | ||
3137 | early_initcall(event_trace_enable_again); | |
3138 | ||
58b92547 | 3139 | __init int event_trace_init(void) |
b77e38aa | 3140 | { |
ae63b31e | 3141 | struct trace_array *tr; |
b77e38aa SR |
3142 | struct dentry *d_tracer; |
3143 | struct dentry *entry; | |
6d723736 | 3144 | int ret; |
b77e38aa | 3145 | |
ae63b31e | 3146 | tr = top_trace_array(); |
dc81e5e3 YY |
3147 | if (!tr) |
3148 | return -ENODEV; | |
ae63b31e | 3149 | |
b77e38aa | 3150 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 3151 | if (IS_ERR(d_tracer)) |
b77e38aa SR |
3152 | return 0; |
3153 | ||
8434dc93 | 3154 | entry = tracefs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 3155 | tr, &ftrace_avail_fops); |
2314c4ae | 3156 | if (!entry) |
8434dc93 | 3157 | pr_warn("Could not create tracefs 'available_events' entry\n"); |
2314c4ae | 3158 | |
9f616680 DW |
3159 | if (trace_define_generic_fields()) |
3160 | pr_warn("tracing: Failed to allocated generic fields"); | |
3161 | ||
8728fe50 | 3162 | if (trace_define_common_fields()) |
3448bac3 | 3163 | pr_warn("tracing: Failed to allocate common fields"); |
8728fe50 | 3164 | |
77248221 | 3165 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
3166 | if (ret) |
3167 | return ret; | |
020e5f85 | 3168 | |
836d481e | 3169 | #ifdef CONFIG_MODULES |
6d723736 | 3170 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 3171 | if (ret) |
3448bac3 | 3172 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 3173 | #endif |
b77e38aa SR |
3174 | return 0; |
3175 | } | |
5f893b26 SRRH |
3176 | |
3177 | void __init trace_event_init(void) | |
3178 | { | |
3179 | event_trace_memsetup(); | |
3180 | init_ftrace_syscalls(); | |
3181 | event_trace_enable(); | |
3182 | } | |
3183 | ||
b3015fe4 | 3184 | #ifdef CONFIG_EVENT_TRACE_STARTUP_TEST |
e6187007 SR |
3185 | |
3186 | static DEFINE_SPINLOCK(test_spinlock); | |
3187 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
3188 | static DEFINE_MUTEX(test_mutex); | |
3189 | ||
3190 | static __init void test_work(struct work_struct *dummy) | |
3191 | { | |
3192 | spin_lock(&test_spinlock); | |
3193 | spin_lock_irq(&test_spinlock_irq); | |
3194 | udelay(1); | |
3195 | spin_unlock_irq(&test_spinlock_irq); | |
3196 | spin_unlock(&test_spinlock); | |
3197 | ||
3198 | mutex_lock(&test_mutex); | |
3199 | msleep(1); | |
3200 | mutex_unlock(&test_mutex); | |
3201 | } | |
3202 | ||
3203 | static __init int event_test_thread(void *unused) | |
3204 | { | |
3205 | void *test_malloc; | |
3206 | ||
3207 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
3208 | if (!test_malloc) | |
3209 | pr_info("failed to kmalloc\n"); | |
3210 | ||
3211 | schedule_on_each_cpu(test_work); | |
3212 | ||
3213 | kfree(test_malloc); | |
3214 | ||
3215 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 3216 | while (!kthread_should_stop()) { |
e6187007 | 3217 | schedule(); |
fe0e01c7 PZ |
3218 | set_current_state(TASK_INTERRUPTIBLE); |
3219 | } | |
3220 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
3221 | |
3222 | return 0; | |
3223 | } | |
3224 | ||
3225 | /* | |
3226 | * Do various things that may trigger events. | |
3227 | */ | |
3228 | static __init void event_test_stuff(void) | |
3229 | { | |
3230 | struct task_struct *test_thread; | |
3231 | ||
3232 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
3233 | msleep(1); | |
3234 | kthread_stop(test_thread); | |
3235 | } | |
3236 | ||
3237 | /* | |
3238 | * For every trace event defined, we will test each trace point separately, | |
3239 | * and then by groups, and finally all trace points. | |
3240 | */ | |
9ea21c1e | 3241 | static __init void event_trace_self_tests(void) |
e6187007 | 3242 | { |
7967b3e0 | 3243 | struct trace_subsystem_dir *dir; |
7f1d2f82 | 3244 | struct trace_event_file *file; |
2425bcb9 | 3245 | struct trace_event_call *call; |
e6187007 | 3246 | struct event_subsystem *system; |
ae63b31e | 3247 | struct trace_array *tr; |
e6187007 SR |
3248 | int ret; |
3249 | ||
ae63b31e | 3250 | tr = top_trace_array(); |
dc81e5e3 YY |
3251 | if (!tr) |
3252 | return; | |
ae63b31e | 3253 | |
e6187007 SR |
3254 | pr_info("Running tests on trace events:\n"); |
3255 | ||
ae63b31e SR |
3256 | list_for_each_entry(file, &tr->events, list) { |
3257 | ||
3258 | call = file->event_call; | |
e6187007 | 3259 | |
2239291a SR |
3260 | /* Only test those that have a probe */ |
3261 | if (!call->class || !call->class->probe) | |
e6187007 SR |
3262 | continue; |
3263 | ||
1f5a6b45 SR |
3264 | /* |
3265 | * Testing syscall events here is pretty useless, but | |
3266 | * we still do it if configured. But this is time consuming. | |
3267 | * What we really need is a user thread to perform the | |
3268 | * syscalls as we test. | |
3269 | */ | |
3270 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
3271 | if (call->class->system && |
3272 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
3273 | continue; |
3274 | #endif | |
3275 | ||
687fcc4a | 3276 | pr_info("Testing event %s: ", trace_event_name(call)); |
e6187007 SR |
3277 | |
3278 | /* | |
3279 | * If an event is already enabled, someone is using | |
3280 | * it and the self test should not be on. | |
3281 | */ | |
5d6ad960 | 3282 | if (file->flags & EVENT_FILE_FL_ENABLED) { |
3448bac3 | 3283 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
3284 | WARN_ON_ONCE(1); |
3285 | continue; | |
3286 | } | |
3287 | ||
ae63b31e | 3288 | ftrace_event_enable_disable(file, 1); |
e6187007 | 3289 | event_test_stuff(); |
ae63b31e | 3290 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
3291 | |
3292 | pr_cont("OK\n"); | |
3293 | } | |
3294 | ||
3295 | /* Now test at the sub system level */ | |
3296 | ||
3297 | pr_info("Running tests on trace event systems:\n"); | |
3298 | ||
ae63b31e SR |
3299 | list_for_each_entry(dir, &tr->systems, list) { |
3300 | ||
3301 | system = dir->subsystem; | |
e6187007 SR |
3302 | |
3303 | /* the ftrace system is special, skip it */ | |
3304 | if (strcmp(system->name, "ftrace") == 0) | |
3305 | continue; | |
3306 | ||
3307 | pr_info("Testing event system %s: ", system->name); | |
3308 | ||
ae63b31e | 3309 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 3310 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3311 | pr_warn("error enabling system %s\n", |
3312 | system->name); | |
e6187007 SR |
3313 | continue; |
3314 | } | |
3315 | ||
3316 | event_test_stuff(); | |
3317 | ||
ae63b31e | 3318 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 3319 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3320 | pr_warn("error disabling system %s\n", |
3321 | system->name); | |
76bab1b7 YL |
3322 | continue; |
3323 | } | |
e6187007 SR |
3324 | |
3325 | pr_cont("OK\n"); | |
3326 | } | |
3327 | ||
3328 | /* Test with all events enabled */ | |
3329 | ||
3330 | pr_info("Running tests on all trace events:\n"); | |
3331 | pr_info("Testing all events: "); | |
3332 | ||
ae63b31e | 3333 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 3334 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3335 | pr_warn("error enabling all events\n"); |
9ea21c1e | 3336 | return; |
e6187007 SR |
3337 | } |
3338 | ||
3339 | event_test_stuff(); | |
3340 | ||
3341 | /* reset sysname */ | |
ae63b31e | 3342 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 3343 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3344 | pr_warn("error disabling all events\n"); |
9ea21c1e | 3345 | return; |
e6187007 SR |
3346 | } |
3347 | ||
3348 | pr_cont("OK\n"); | |
9ea21c1e SR |
3349 | } |
3350 | ||
3351 | #ifdef CONFIG_FUNCTION_TRACER | |
3352 | ||
245b2e70 | 3353 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e | 3354 | |
9b9db275 | 3355 | static struct trace_event_file event_trace_file __initdata; |
b7f0c959 SRRH |
3356 | |
3357 | static void __init | |
2f5f6ad9 | 3358 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 3359 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
3360 | { |
3361 | struct ring_buffer_event *event; | |
e77405ad | 3362 | struct ring_buffer *buffer; |
9ea21c1e SR |
3363 | struct ftrace_entry *entry; |
3364 | unsigned long flags; | |
3365 | long disabled; | |
9ea21c1e SR |
3366 | int cpu; |
3367 | int pc; | |
3368 | ||
3369 | pc = preempt_count(); | |
5168ae50 | 3370 | preempt_disable_notrace(); |
9ea21c1e | 3371 | cpu = raw_smp_processor_id(); |
245b2e70 | 3372 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
3373 | |
3374 | if (disabled != 1) | |
3375 | goto out; | |
3376 | ||
3377 | local_save_flags(flags); | |
3378 | ||
9b9db275 SRRH |
3379 | event = trace_event_buffer_lock_reserve(&buffer, &event_trace_file, |
3380 | TRACE_FN, sizeof(*entry), | |
3381 | flags, pc); | |
9ea21c1e SR |
3382 | if (!event) |
3383 | goto out; | |
3384 | entry = ring_buffer_event_data(event); | |
3385 | entry->ip = ip; | |
3386 | entry->parent_ip = parent_ip; | |
3387 | ||
9b9db275 SRRH |
3388 | event_trigger_unlock_commit(&event_trace_file, buffer, event, |
3389 | entry, flags, pc); | |
9ea21c1e | 3390 | out: |
245b2e70 | 3391 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 3392 | preempt_enable_notrace(); |
9ea21c1e SR |
3393 | } |
3394 | ||
3395 | static struct ftrace_ops trace_ops __initdata = | |
3396 | { | |
3397 | .func = function_test_events_call, | |
4740974a | 3398 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
3399 | }; |
3400 | ||
3401 | static __init void event_trace_self_test_with_function(void) | |
3402 | { | |
17bb615a | 3403 | int ret; |
9b9db275 SRRH |
3404 | |
3405 | event_trace_file.tr = top_trace_array(); | |
3406 | if (WARN_ON(!event_trace_file.tr)) | |
2d34f489 | 3407 | return; |
9b9db275 | 3408 | |
17bb615a SR |
3409 | ret = register_ftrace_function(&trace_ops); |
3410 | if (WARN_ON(ret < 0)) { | |
3411 | pr_info("Failed to enable function tracer for event tests\n"); | |
3412 | return; | |
3413 | } | |
9ea21c1e SR |
3414 | pr_info("Running tests again, along with the function tracer\n"); |
3415 | event_trace_self_tests(); | |
3416 | unregister_ftrace_function(&trace_ops); | |
3417 | } | |
3418 | #else | |
3419 | static __init void event_trace_self_test_with_function(void) | |
3420 | { | |
3421 | } | |
3422 | #endif | |
3423 | ||
3424 | static __init int event_trace_self_tests_init(void) | |
3425 | { | |
020e5f85 LZ |
3426 | if (!tracing_selftest_disabled) { |
3427 | event_trace_self_tests(); | |
3428 | event_trace_self_test_with_function(); | |
3429 | } | |
e6187007 SR |
3430 | |
3431 | return 0; | |
3432 | } | |
3433 | ||
28d20e2d | 3434 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
3435 | |
3436 | #endif |