]>
Commit | Line | Data |
---|---|---|
b77e38aa SR |
1 | /* |
2 | * event tracer | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
981d081e SR |
6 | * - Added format output of fields of the trace point. |
7 | * This was based off of work by Tom Zanussi <tzanussi@gmail.com>. | |
8 | * | |
b77e38aa SR |
9 | */ |
10 | ||
3448bac3 FF |
11 | #define pr_fmt(fmt) fmt |
12 | ||
e6187007 SR |
13 | #include <linux/workqueue.h> |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/kthread.h> | |
8434dc93 | 16 | #include <linux/tracefs.h> |
b77e38aa | 17 | #include <linux/uaccess.h> |
f4d34a87 | 18 | #include <linux/vmalloc.h> |
b77e38aa SR |
19 | #include <linux/module.h> |
20 | #include <linux/ctype.h> | |
49090107 | 21 | #include <linux/sort.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
e6187007 | 23 | #include <linux/delay.h> |
b77e38aa | 24 | |
3fdaf80f SRRH |
25 | #include <trace/events/sched.h> |
26 | ||
020e5f85 LZ |
27 | #include <asm/setup.h> |
28 | ||
91729ef9 | 29 | #include "trace_output.h" |
b77e38aa | 30 | |
4e5292ea | 31 | #undef TRACE_SYSTEM |
b628b3e6 SR |
32 | #define TRACE_SYSTEM "TRACE_SYSTEM" |
33 | ||
20c8928a | 34 | DEFINE_MUTEX(event_mutex); |
11a241a3 | 35 | |
a59fd602 | 36 | LIST_HEAD(ftrace_events); |
9f616680 | 37 | static LIST_HEAD(ftrace_generic_fields); |
b3a8c6fd | 38 | static LIST_HEAD(ftrace_common_fields); |
a59fd602 | 39 | |
d1a29143 SR |
40 | #define GFP_TRACE (GFP_KERNEL | __GFP_ZERO) |
41 | ||
42 | static struct kmem_cache *field_cachep; | |
43 | static struct kmem_cache *file_cachep; | |
44 | ||
6e94a780 SR |
45 | static inline int system_refcount(struct event_subsystem *system) |
46 | { | |
79ac6ef5 | 47 | return system->ref_count; |
6e94a780 SR |
48 | } |
49 | ||
50 | static int system_refcount_inc(struct event_subsystem *system) | |
51 | { | |
79ac6ef5 | 52 | return system->ref_count++; |
6e94a780 SR |
53 | } |
54 | ||
55 | static int system_refcount_dec(struct event_subsystem *system) | |
56 | { | |
79ac6ef5 | 57 | return --system->ref_count; |
6e94a780 SR |
58 | } |
59 | ||
ae63b31e SR |
60 | /* Double loops, do not use break, only goto's work */ |
61 | #define do_for_each_event_file(tr, file) \ | |
62 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
63 | list_for_each_entry(file, &tr->events, list) | |
64 | ||
65 | #define do_for_each_event_file_safe(tr, file) \ | |
66 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { \ | |
7f1d2f82 | 67 | struct trace_event_file *___n; \ |
ae63b31e SR |
68 | list_for_each_entry_safe(file, ___n, &tr->events, list) |
69 | ||
70 | #define while_for_each_event_file() \ | |
71 | } | |
72 | ||
b3a8c6fd | 73 | static struct list_head * |
2425bcb9 | 74 | trace_get_fields(struct trace_event_call *event_call) |
2e33af02 SR |
75 | { |
76 | if (!event_call->class->get_fields) | |
77 | return &event_call->class->fields; | |
78 | return event_call->class->get_fields(event_call); | |
79 | } | |
80 | ||
b3a8c6fd J |
81 | static struct ftrace_event_field * |
82 | __find_event_field(struct list_head *head, char *name) | |
83 | { | |
84 | struct ftrace_event_field *field; | |
85 | ||
86 | list_for_each_entry(field, head, link) { | |
87 | if (!strcmp(field->name, name)) | |
88 | return field; | |
89 | } | |
90 | ||
91 | return NULL; | |
92 | } | |
93 | ||
94 | struct ftrace_event_field * | |
2425bcb9 | 95 | trace_find_event_field(struct trace_event_call *call, char *name) |
b3a8c6fd J |
96 | { |
97 | struct ftrace_event_field *field; | |
98 | struct list_head *head; | |
99 | ||
e57cbaf0 SRRH |
100 | head = trace_get_fields(call); |
101 | field = __find_event_field(head, name); | |
9f616680 DW |
102 | if (field) |
103 | return field; | |
104 | ||
e57cbaf0 | 105 | field = __find_event_field(&ftrace_generic_fields, name); |
b3a8c6fd J |
106 | if (field) |
107 | return field; | |
108 | ||
e57cbaf0 | 109 | return __find_event_field(&ftrace_common_fields, name); |
b3a8c6fd J |
110 | } |
111 | ||
8728fe50 LZ |
112 | static int __trace_define_field(struct list_head *head, const char *type, |
113 | const char *name, int offset, int size, | |
114 | int is_signed, int filter_type) | |
cf027f64 TZ |
115 | { |
116 | struct ftrace_event_field *field; | |
117 | ||
d1a29143 | 118 | field = kmem_cache_alloc(field_cachep, GFP_TRACE); |
cf027f64 | 119 | if (!field) |
aaf6ac0f | 120 | return -ENOMEM; |
fe9f57f2 | 121 | |
92edca07 SR |
122 | field->name = name; |
123 | field->type = type; | |
fe9f57f2 | 124 | |
43b51ead LZ |
125 | if (filter_type == FILTER_OTHER) |
126 | field->filter_type = filter_assign_type(type); | |
127 | else | |
128 | field->filter_type = filter_type; | |
129 | ||
cf027f64 TZ |
130 | field->offset = offset; |
131 | field->size = size; | |
a118e4d1 | 132 | field->is_signed = is_signed; |
aa38e9fc | 133 | |
2e33af02 | 134 | list_add(&field->link, head); |
cf027f64 TZ |
135 | |
136 | return 0; | |
cf027f64 | 137 | } |
8728fe50 | 138 | |
2425bcb9 | 139 | int trace_define_field(struct trace_event_call *call, const char *type, |
8728fe50 LZ |
140 | const char *name, int offset, int size, int is_signed, |
141 | int filter_type) | |
142 | { | |
143 | struct list_head *head; | |
144 | ||
145 | if (WARN_ON(!call->class)) | |
146 | return 0; | |
147 | ||
148 | head = trace_get_fields(call); | |
149 | return __trace_define_field(head, type, name, offset, size, | |
150 | is_signed, filter_type); | |
151 | } | |
17c873ec | 152 | EXPORT_SYMBOL_GPL(trace_define_field); |
cf027f64 | 153 | |
9f616680 DW |
154 | #define __generic_field(type, item, filter_type) \ |
155 | ret = __trace_define_field(&ftrace_generic_fields, #type, \ | |
156 | #item, 0, 0, is_signed_type(type), \ | |
157 | filter_type); \ | |
158 | if (ret) \ | |
159 | return ret; | |
160 | ||
e647d6b3 | 161 | #define __common_field(type, item) \ |
8728fe50 LZ |
162 | ret = __trace_define_field(&ftrace_common_fields, #type, \ |
163 | "common_" #item, \ | |
164 | offsetof(typeof(ent), item), \ | |
165 | sizeof(ent.item), \ | |
166 | is_signed_type(type), FILTER_OTHER); \ | |
e647d6b3 LZ |
167 | if (ret) \ |
168 | return ret; | |
169 | ||
9f616680 DW |
170 | static int trace_define_generic_fields(void) |
171 | { | |
172 | int ret; | |
173 | ||
e57cbaf0 SRRH |
174 | __generic_field(int, CPU, FILTER_CPU); |
175 | __generic_field(int, cpu, FILTER_CPU); | |
176 | __generic_field(char *, COMM, FILTER_COMM); | |
177 | __generic_field(char *, comm, FILTER_COMM); | |
9f616680 DW |
178 | |
179 | return ret; | |
180 | } | |
181 | ||
8728fe50 | 182 | static int trace_define_common_fields(void) |
e647d6b3 LZ |
183 | { |
184 | int ret; | |
185 | struct trace_entry ent; | |
186 | ||
187 | __common_field(unsigned short, type); | |
188 | __common_field(unsigned char, flags); | |
189 | __common_field(unsigned char, preempt_count); | |
190 | __common_field(int, pid); | |
e647d6b3 LZ |
191 | |
192 | return ret; | |
193 | } | |
194 | ||
2425bcb9 | 195 | static void trace_destroy_fields(struct trace_event_call *call) |
2df75e41 LZ |
196 | { |
197 | struct ftrace_event_field *field, *next; | |
2e33af02 | 198 | struct list_head *head; |
2df75e41 | 199 | |
2e33af02 SR |
200 | head = trace_get_fields(call); |
201 | list_for_each_entry_safe(field, next, head, link) { | |
2df75e41 | 202 | list_del(&field->link); |
d1a29143 | 203 | kmem_cache_free(field_cachep, field); |
2df75e41 LZ |
204 | } |
205 | } | |
206 | ||
32bbe007 AS |
207 | /* |
208 | * run-time version of trace_event_get_offsets_<call>() that returns the last | |
209 | * accessible offset of trace fields excluding __dynamic_array bytes | |
210 | */ | |
211 | int trace_event_get_offsets(struct trace_event_call *call) | |
212 | { | |
213 | struct ftrace_event_field *tail; | |
214 | struct list_head *head; | |
215 | ||
216 | head = trace_get_fields(call); | |
217 | /* | |
218 | * head->next points to the last field with the largest offset, | |
219 | * since it was added last by trace_define_field() | |
220 | */ | |
221 | tail = list_first_entry(head, struct ftrace_event_field, link); | |
222 | return tail->offset + tail->size; | |
223 | } | |
224 | ||
2425bcb9 | 225 | int trace_event_raw_init(struct trace_event_call *call) |
87d9b4e1 LZ |
226 | { |
227 | int id; | |
228 | ||
9023c930 | 229 | id = register_trace_event(&call->event); |
87d9b4e1 LZ |
230 | if (!id) |
231 | return -ENODEV; | |
87d9b4e1 LZ |
232 | |
233 | return 0; | |
234 | } | |
235 | EXPORT_SYMBOL_GPL(trace_event_raw_init); | |
236 | ||
3fdaf80f SRRH |
237 | bool trace_event_ignore_this_pid(struct trace_event_file *trace_file) |
238 | { | |
239 | struct trace_array *tr = trace_file->tr; | |
240 | struct trace_array_cpu *data; | |
241 | struct trace_pid_list *pid_list; | |
242 | ||
243 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
244 | if (!pid_list) | |
245 | return false; | |
246 | ||
247 | data = this_cpu_ptr(tr->trace_buffer.data); | |
248 | ||
249 | return data->ignore_pid; | |
250 | } | |
251 | EXPORT_SYMBOL_GPL(trace_event_ignore_this_pid); | |
252 | ||
3f795dcf SRRH |
253 | void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer, |
254 | struct trace_event_file *trace_file, | |
255 | unsigned long len) | |
3fd40d1e | 256 | { |
2425bcb9 | 257 | struct trace_event_call *event_call = trace_file->event_call; |
3fd40d1e | 258 | |
3fdaf80f SRRH |
259 | if ((trace_file->flags & EVENT_FILE_FL_PID_FILTER) && |
260 | trace_event_ignore_this_pid(trace_file)) | |
261 | return NULL; | |
262 | ||
3fd40d1e SR |
263 | local_save_flags(fbuffer->flags); |
264 | fbuffer->pc = preempt_count(); | |
7f1d2f82 | 265 | fbuffer->trace_file = trace_file; |
3fd40d1e SR |
266 | |
267 | fbuffer->event = | |
7f1d2f82 | 268 | trace_event_buffer_lock_reserve(&fbuffer->buffer, trace_file, |
3fd40d1e SR |
269 | event_call->event.type, len, |
270 | fbuffer->flags, fbuffer->pc); | |
271 | if (!fbuffer->event) | |
272 | return NULL; | |
273 | ||
274 | fbuffer->entry = ring_buffer_event_data(fbuffer->event); | |
275 | return fbuffer->entry; | |
276 | } | |
3f795dcf | 277 | EXPORT_SYMBOL_GPL(trace_event_buffer_reserve); |
3fd40d1e | 278 | |
0daa2302 SRRH |
279 | static DEFINE_SPINLOCK(tracepoint_iter_lock); |
280 | ||
3f795dcf | 281 | static void output_printk(struct trace_event_buffer *fbuffer) |
0daa2302 | 282 | { |
2425bcb9 | 283 | struct trace_event_call *event_call; |
0daa2302 SRRH |
284 | struct trace_event *event; |
285 | unsigned long flags; | |
286 | struct trace_iterator *iter = tracepoint_print_iter; | |
287 | ||
288 | if (!iter) | |
289 | return; | |
290 | ||
7f1d2f82 | 291 | event_call = fbuffer->trace_file->event_call; |
0daa2302 SRRH |
292 | if (!event_call || !event_call->event.funcs || |
293 | !event_call->event.funcs->trace) | |
294 | return; | |
295 | ||
7f1d2f82 | 296 | event = &fbuffer->trace_file->event_call->event; |
0daa2302 SRRH |
297 | |
298 | spin_lock_irqsave(&tracepoint_iter_lock, flags); | |
299 | trace_seq_init(&iter->seq); | |
300 | iter->ent = fbuffer->entry; | |
301 | event_call->event.funcs->trace(iter, 0, event); | |
302 | trace_seq_putc(&iter->seq, 0); | |
303 | printk("%s", iter->seq.buffer); | |
304 | ||
305 | spin_unlock_irqrestore(&tracepoint_iter_lock, flags); | |
306 | } | |
307 | ||
3f795dcf | 308 | void trace_event_buffer_commit(struct trace_event_buffer *fbuffer) |
3fd40d1e | 309 | { |
0daa2302 SRRH |
310 | if (tracepoint_printk) |
311 | output_printk(fbuffer); | |
312 | ||
7f1d2f82 | 313 | event_trigger_unlock_commit(fbuffer->trace_file, fbuffer->buffer, |
3fd40d1e SR |
314 | fbuffer->event, fbuffer->entry, |
315 | fbuffer->flags, fbuffer->pc); | |
316 | } | |
3f795dcf | 317 | EXPORT_SYMBOL_GPL(trace_event_buffer_commit); |
3fd40d1e | 318 | |
2425bcb9 | 319 | int trace_event_reg(struct trace_event_call *call, |
9023c930 | 320 | enum trace_reg type, void *data) |
a1d0ce82 | 321 | { |
7f1d2f82 | 322 | struct trace_event_file *file = data; |
ae63b31e | 323 | |
de7b2973 | 324 | WARN_ON(!(call->flags & TRACE_EVENT_FL_TRACEPOINT)); |
a1d0ce82 SR |
325 | switch (type) { |
326 | case TRACE_REG_REGISTER: | |
de7b2973 | 327 | return tracepoint_probe_register(call->tp, |
a1d0ce82 | 328 | call->class->probe, |
ae63b31e | 329 | file); |
a1d0ce82 | 330 | case TRACE_REG_UNREGISTER: |
de7b2973 | 331 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 | 332 | call->class->probe, |
ae63b31e | 333 | file); |
a1d0ce82 SR |
334 | return 0; |
335 | ||
336 | #ifdef CONFIG_PERF_EVENTS | |
337 | case TRACE_REG_PERF_REGISTER: | |
de7b2973 | 338 | return tracepoint_probe_register(call->tp, |
a1d0ce82 SR |
339 | call->class->perf_probe, |
340 | call); | |
341 | case TRACE_REG_PERF_UNREGISTER: | |
de7b2973 | 342 | tracepoint_probe_unregister(call->tp, |
a1d0ce82 SR |
343 | call->class->perf_probe, |
344 | call); | |
345 | return 0; | |
ceec0b6f JO |
346 | case TRACE_REG_PERF_OPEN: |
347 | case TRACE_REG_PERF_CLOSE: | |
489c75c3 JO |
348 | case TRACE_REG_PERF_ADD: |
349 | case TRACE_REG_PERF_DEL: | |
ceec0b6f | 350 | return 0; |
a1d0ce82 SR |
351 | #endif |
352 | } | |
353 | return 0; | |
354 | } | |
9023c930 | 355 | EXPORT_SYMBOL_GPL(trace_event_reg); |
a1d0ce82 | 356 | |
e870e9a1 LZ |
357 | void trace_event_enable_cmd_record(bool enable) |
358 | { | |
7f1d2f82 | 359 | struct trace_event_file *file; |
ae63b31e | 360 | struct trace_array *tr; |
e870e9a1 LZ |
361 | |
362 | mutex_lock(&event_mutex); | |
ae63b31e SR |
363 | do_for_each_event_file(tr, file) { |
364 | ||
5d6ad960 | 365 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) |
e870e9a1 LZ |
366 | continue; |
367 | ||
368 | if (enable) { | |
369 | tracing_start_cmdline_record(); | |
5d6ad960 | 370 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 LZ |
371 | } else { |
372 | tracing_stop_cmdline_record(); | |
5d6ad960 | 373 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 374 | } |
ae63b31e | 375 | } while_for_each_event_file(); |
e870e9a1 LZ |
376 | mutex_unlock(&event_mutex); |
377 | } | |
378 | ||
7f1d2f82 | 379 | static int __ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 | 380 | int enable, int soft_disable) |
fd994989 | 381 | { |
2425bcb9 | 382 | struct trace_event_call *call = file->event_call; |
983f938a | 383 | struct trace_array *tr = file->tr; |
0fc1b09f | 384 | unsigned long file_flags = file->flags; |
3b8e4273 | 385 | int ret = 0; |
417944c4 | 386 | int disable; |
3b8e4273 | 387 | |
fd994989 SR |
388 | switch (enable) { |
389 | case 0: | |
417944c4 | 390 | /* |
1cf4c073 MH |
391 | * When soft_disable is set and enable is cleared, the sm_ref |
392 | * reference counter is decremented. If it reaches 0, we want | |
417944c4 SRRH |
393 | * to clear the SOFT_DISABLED flag but leave the event in the |
394 | * state that it was. That is, if the event was enabled and | |
395 | * SOFT_DISABLED isn't set, then do nothing. But if SOFT_DISABLED | |
396 | * is set we do not want the event to be enabled before we | |
397 | * clear the bit. | |
398 | * | |
399 | * When soft_disable is not set but the SOFT_MODE flag is, | |
400 | * we do nothing. Do not disable the tracepoint, otherwise | |
401 | * "soft enable"s (clearing the SOFT_DISABLED bit) wont work. | |
402 | */ | |
403 | if (soft_disable) { | |
1cf4c073 MH |
404 | if (atomic_dec_return(&file->sm_ref) > 0) |
405 | break; | |
5d6ad960 SRRH |
406 | disable = file->flags & EVENT_FILE_FL_SOFT_DISABLED; |
407 | clear_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); | |
417944c4 | 408 | } else |
5d6ad960 | 409 | disable = !(file->flags & EVENT_FILE_FL_SOFT_MODE); |
417944c4 | 410 | |
5d6ad960 SRRH |
411 | if (disable && (file->flags & EVENT_FILE_FL_ENABLED)) { |
412 | clear_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); | |
413 | if (file->flags & EVENT_FILE_FL_RECORDED_CMD) { | |
e870e9a1 | 414 | tracing_stop_cmdline_record(); |
5d6ad960 | 415 | clear_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 416 | } |
ae63b31e | 417 | call->class->reg(call, TRACE_REG_UNREGISTER, file); |
fd994989 | 418 | } |
3baa5e4c | 419 | /* If in SOFT_MODE, just set the SOFT_DISABLE_BIT, else clear it */ |
5d6ad960 SRRH |
420 | if (file->flags & EVENT_FILE_FL_SOFT_MODE) |
421 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); | |
3baa5e4c | 422 | else |
5d6ad960 | 423 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
fd994989 SR |
424 | break; |
425 | case 1: | |
417944c4 SRRH |
426 | /* |
427 | * When soft_disable is set and enable is set, we want to | |
428 | * register the tracepoint for the event, but leave the event | |
429 | * as is. That means, if the event was already enabled, we do | |
430 | * nothing (but set SOFT_MODE). If the event is disabled, we | |
431 | * set SOFT_DISABLED before enabling the event tracepoint, so | |
432 | * it still seems to be disabled. | |
433 | */ | |
434 | if (!soft_disable) | |
5d6ad960 | 435 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
1cf4c073 MH |
436 | else { |
437 | if (atomic_inc_return(&file->sm_ref) > 1) | |
438 | break; | |
5d6ad960 | 439 | set_bit(EVENT_FILE_FL_SOFT_MODE_BIT, &file->flags); |
1cf4c073 | 440 | } |
417944c4 | 441 | |
5d6ad960 | 442 | if (!(file->flags & EVENT_FILE_FL_ENABLED)) { |
417944c4 SRRH |
443 | |
444 | /* Keep the event disabled, when going to SOFT_MODE. */ | |
445 | if (soft_disable) | |
5d6ad960 | 446 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &file->flags); |
417944c4 | 447 | |
983f938a | 448 | if (tr->trace_flags & TRACE_ITER_RECORD_CMD) { |
e870e9a1 | 449 | tracing_start_cmdline_record(); |
5d6ad960 | 450 | set_bit(EVENT_FILE_FL_RECORDED_CMD_BIT, &file->flags); |
e870e9a1 | 451 | } |
ae63b31e | 452 | ret = call->class->reg(call, TRACE_REG_REGISTER, file); |
3b8e4273 LZ |
453 | if (ret) { |
454 | tracing_stop_cmdline_record(); | |
455 | pr_info("event trace: Could not enable event " | |
687fcc4a | 456 | "%s\n", trace_event_name(call)); |
3b8e4273 LZ |
457 | break; |
458 | } | |
5d6ad960 | 459 | set_bit(EVENT_FILE_FL_ENABLED_BIT, &file->flags); |
575380da SRRH |
460 | |
461 | /* WAS_ENABLED gets set but never cleared. */ | |
462 | call->flags |= TRACE_EVENT_FL_WAS_ENABLED; | |
fd994989 | 463 | } |
fd994989 SR |
464 | break; |
465 | } | |
3b8e4273 | 466 | |
0fc1b09f SRRH |
467 | /* Enable or disable use of trace_buffered_event */ |
468 | if ((file_flags & EVENT_FILE_FL_SOFT_DISABLED) != | |
469 | (file->flags & EVENT_FILE_FL_SOFT_DISABLED)) { | |
470 | if (file->flags & EVENT_FILE_FL_SOFT_DISABLED) | |
471 | trace_buffered_event_enable(); | |
472 | else | |
473 | trace_buffered_event_disable(); | |
474 | } | |
475 | ||
3b8e4273 | 476 | return ret; |
fd994989 SR |
477 | } |
478 | ||
7f1d2f82 | 479 | int trace_event_enable_disable(struct trace_event_file *file, |
85f2b082 TZ |
480 | int enable, int soft_disable) |
481 | { | |
482 | return __ftrace_event_enable_disable(file, enable, soft_disable); | |
483 | } | |
484 | ||
7f1d2f82 | 485 | static int ftrace_event_enable_disable(struct trace_event_file *file, |
417944c4 SRRH |
486 | int enable) |
487 | { | |
488 | return __ftrace_event_enable_disable(file, enable, 0); | |
489 | } | |
490 | ||
ae63b31e | 491 | static void ftrace_clear_events(struct trace_array *tr) |
0e907c99 | 492 | { |
7f1d2f82 | 493 | struct trace_event_file *file; |
0e907c99 Z |
494 | |
495 | mutex_lock(&event_mutex); | |
ae63b31e SR |
496 | list_for_each_entry(file, &tr->events, list) { |
497 | ftrace_event_enable_disable(file, 0); | |
0e907c99 Z |
498 | } |
499 | mutex_unlock(&event_mutex); | |
500 | } | |
501 | ||
f4d34a87 SR |
502 | /* Shouldn't this be in a header? */ |
503 | extern int pid_max; | |
49090107 | 504 | |
c37775d5 | 505 | /* Returns true if found in filter */ |
3fdaf80f | 506 | static bool |
c37775d5 | 507 | find_filtered_pid(struct trace_pid_list *filtered_pids, pid_t search_pid) |
49090107 | 508 | { |
c37775d5 SR |
509 | /* |
510 | * If pid_max changed after filtered_pids was created, we | |
511 | * by default ignore all pids greater than the previous pid_max. | |
512 | */ | |
513 | if (search_pid >= filtered_pids->pid_max) | |
514 | return false; | |
49090107 | 515 | |
c37775d5 | 516 | return test_bit(search_pid, filtered_pids->pids); |
49090107 SRRH |
517 | } |
518 | ||
3fdaf80f | 519 | static bool |
c37775d5 | 520 | ignore_this_task(struct trace_pid_list *filtered_pids, struct task_struct *task) |
3fdaf80f | 521 | { |
3fdaf80f SRRH |
522 | /* |
523 | * Return false, because if filtered_pids does not exist, | |
524 | * all pids are good to trace. | |
525 | */ | |
526 | if (!filtered_pids) | |
527 | return false; | |
528 | ||
c37775d5 SR |
529 | return !find_filtered_pid(filtered_pids, task->pid); |
530 | } | |
3fdaf80f | 531 | |
c37775d5 SR |
532 | static void filter_add_remove_task(struct trace_pid_list *pid_list, |
533 | struct task_struct *self, | |
534 | struct task_struct *task) | |
535 | { | |
536 | if (!pid_list) | |
537 | return; | |
538 | ||
539 | /* For forks, we only add if the forking task is listed */ | |
540 | if (self) { | |
541 | if (!find_filtered_pid(pid_list, self->pid)) | |
542 | return; | |
543 | } | |
3fdaf80f | 544 | |
c37775d5 SR |
545 | /* Sorry, but we don't support pid_max changing after setting */ |
546 | if (task->pid >= pid_list->pid_max) | |
547 | return; | |
3fdaf80f | 548 | |
c37775d5 SR |
549 | /* "self" is set for forks, and NULL for exits */ |
550 | if (self) | |
551 | set_bit(task->pid, pid_list->pids); | |
552 | else | |
553 | clear_bit(task->pid, pid_list->pids); | |
554 | } | |
555 | ||
556 | static void | |
557 | event_filter_pid_sched_process_exit(void *data, struct task_struct *task) | |
558 | { | |
559 | struct trace_pid_list *pid_list; | |
560 | struct trace_array *tr = data; | |
561 | ||
562 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
563 | filter_add_remove_task(pid_list, NULL, task); | |
564 | } | |
565 | ||
566 | static void | |
567 | event_filter_pid_sched_process_fork(void *data, | |
568 | struct task_struct *self, | |
569 | struct task_struct *task) | |
570 | { | |
571 | struct trace_pid_list *pid_list; | |
572 | struct trace_array *tr = data; | |
573 | ||
574 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
575 | filter_add_remove_task(pid_list, self, task); | |
576 | } | |
577 | ||
578 | void trace_event_follow_fork(struct trace_array *tr, bool enable) | |
579 | { | |
580 | if (enable) { | |
581 | register_trace_prio_sched_process_fork(event_filter_pid_sched_process_fork, | |
582 | tr, INT_MIN); | |
583 | register_trace_prio_sched_process_exit(event_filter_pid_sched_process_exit, | |
584 | tr, INT_MAX); | |
585 | } else { | |
586 | unregister_trace_sched_process_fork(event_filter_pid_sched_process_fork, | |
587 | tr); | |
588 | unregister_trace_sched_process_exit(event_filter_pid_sched_process_exit, | |
589 | tr); | |
590 | } | |
3fdaf80f SRRH |
591 | } |
592 | ||
593 | static void | |
22402cd0 | 594 | event_filter_pid_sched_switch_probe_pre(void *data, bool preempt, |
3fdaf80f SRRH |
595 | struct task_struct *prev, struct task_struct *next) |
596 | { | |
597 | struct trace_array *tr = data; | |
598 | struct trace_pid_list *pid_list; | |
599 | ||
600 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
601 | ||
602 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
9ebc57cf SR |
603 | ignore_this_task(pid_list, prev) && |
604 | ignore_this_task(pid_list, next)); | |
3fdaf80f SRRH |
605 | } |
606 | ||
607 | static void | |
22402cd0 | 608 | event_filter_pid_sched_switch_probe_post(void *data, bool preempt, |
3fdaf80f SRRH |
609 | struct task_struct *prev, struct task_struct *next) |
610 | { | |
611 | struct trace_array *tr = data; | |
612 | struct trace_pid_list *pid_list; | |
613 | ||
614 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
615 | ||
616 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
9ebc57cf | 617 | ignore_this_task(pid_list, next)); |
3fdaf80f SRRH |
618 | } |
619 | ||
620 | static void | |
621 | event_filter_pid_sched_wakeup_probe_pre(void *data, struct task_struct *task) | |
622 | { | |
623 | struct trace_array *tr = data; | |
624 | struct trace_pid_list *pid_list; | |
625 | ||
626 | /* Nothing to do if we are already tracing */ | |
627 | if (!this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
628 | return; | |
629 | ||
630 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
631 | ||
632 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
9ebc57cf | 633 | ignore_this_task(pid_list, task)); |
3fdaf80f SRRH |
634 | } |
635 | ||
636 | static void | |
637 | event_filter_pid_sched_wakeup_probe_post(void *data, struct task_struct *task) | |
638 | { | |
639 | struct trace_array *tr = data; | |
640 | struct trace_pid_list *pid_list; | |
641 | ||
642 | /* Nothing to do if we are not tracing */ | |
643 | if (this_cpu_read(tr->trace_buffer.data->ignore_pid)) | |
644 | return; | |
645 | ||
646 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
647 | ||
648 | /* Set tracing if current is enabled */ | |
649 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
9ebc57cf | 650 | ignore_this_task(pid_list, current)); |
3fdaf80f SRRH |
651 | } |
652 | ||
49090107 SRRH |
653 | static void __ftrace_clear_event_pids(struct trace_array *tr) |
654 | { | |
655 | struct trace_pid_list *pid_list; | |
3fdaf80f SRRH |
656 | struct trace_event_file *file; |
657 | int cpu; | |
49090107 SRRH |
658 | |
659 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
660 | lockdep_is_held(&event_mutex)); | |
661 | if (!pid_list) | |
662 | return; | |
663 | ||
3fdaf80f SRRH |
664 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_pre, tr); |
665 | unregister_trace_sched_switch(event_filter_pid_sched_switch_probe_post, tr); | |
666 | ||
667 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, tr); | |
668 | unregister_trace_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, tr); | |
669 | ||
0f72e37e SRRH |
670 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, tr); |
671 | unregister_trace_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, tr); | |
672 | ||
673 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_pre, tr); | |
674 | unregister_trace_sched_waking(event_filter_pid_sched_wakeup_probe_post, tr); | |
675 | ||
3fdaf80f SRRH |
676 | list_for_each_entry(file, &tr->events, list) { |
677 | clear_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
678 | } | |
679 | ||
680 | for_each_possible_cpu(cpu) | |
681 | per_cpu_ptr(tr->trace_buffer.data, cpu)->ignore_pid = false; | |
682 | ||
49090107 SRRH |
683 | rcu_assign_pointer(tr->filtered_pids, NULL); |
684 | ||
685 | /* Wait till all users are no longer using pid filtering */ | |
686 | synchronize_sched(); | |
687 | ||
f4d34a87 | 688 | vfree(pid_list->pids); |
49090107 SRRH |
689 | kfree(pid_list); |
690 | } | |
691 | ||
692 | static void ftrace_clear_event_pids(struct trace_array *tr) | |
693 | { | |
694 | mutex_lock(&event_mutex); | |
695 | __ftrace_clear_event_pids(tr); | |
696 | mutex_unlock(&event_mutex); | |
697 | } | |
698 | ||
e9dbfae5 SR |
699 | static void __put_system(struct event_subsystem *system) |
700 | { | |
701 | struct event_filter *filter = system->filter; | |
702 | ||
6e94a780 SR |
703 | WARN_ON_ONCE(system_refcount(system) == 0); |
704 | if (system_refcount_dec(system)) | |
e9dbfae5 SR |
705 | return; |
706 | ||
ae63b31e SR |
707 | list_del(&system->list); |
708 | ||
e9dbfae5 SR |
709 | if (filter) { |
710 | kfree(filter->filter_string); | |
711 | kfree(filter); | |
712 | } | |
79ac6ef5 | 713 | kfree_const(system->name); |
e9dbfae5 SR |
714 | kfree(system); |
715 | } | |
716 | ||
717 | static void __get_system(struct event_subsystem *system) | |
718 | { | |
6e94a780 SR |
719 | WARN_ON_ONCE(system_refcount(system) == 0); |
720 | system_refcount_inc(system); | |
e9dbfae5 SR |
721 | } |
722 | ||
7967b3e0 | 723 | static void __get_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
724 | { |
725 | WARN_ON_ONCE(dir->ref_count == 0); | |
726 | dir->ref_count++; | |
727 | __get_system(dir->subsystem); | |
728 | } | |
729 | ||
7967b3e0 | 730 | static void __put_system_dir(struct trace_subsystem_dir *dir) |
ae63b31e SR |
731 | { |
732 | WARN_ON_ONCE(dir->ref_count == 0); | |
733 | /* If the subsystem is about to be freed, the dir must be too */ | |
6e94a780 | 734 | WARN_ON_ONCE(system_refcount(dir->subsystem) == 1 && dir->ref_count != 1); |
ae63b31e SR |
735 | |
736 | __put_system(dir->subsystem); | |
737 | if (!--dir->ref_count) | |
738 | kfree(dir); | |
739 | } | |
740 | ||
7967b3e0 | 741 | static void put_system(struct trace_subsystem_dir *dir) |
e9dbfae5 SR |
742 | { |
743 | mutex_lock(&event_mutex); | |
ae63b31e | 744 | __put_system_dir(dir); |
e9dbfae5 SR |
745 | mutex_unlock(&event_mutex); |
746 | } | |
747 | ||
7967b3e0 | 748 | static void remove_subsystem(struct trace_subsystem_dir *dir) |
f6a84bdc ON |
749 | { |
750 | if (!dir) | |
751 | return; | |
752 | ||
753 | if (!--dir->nr_events) { | |
8434dc93 | 754 | tracefs_remove_recursive(dir->entry); |
f6a84bdc ON |
755 | list_del(&dir->list); |
756 | __put_system_dir(dir); | |
757 | } | |
758 | } | |
759 | ||
7f1d2f82 | 760 | static void remove_event_file_dir(struct trace_event_file *file) |
f6a84bdc | 761 | { |
bf682c31 ON |
762 | struct dentry *dir = file->dir; |
763 | struct dentry *child; | |
764 | ||
765 | if (dir) { | |
766 | spin_lock(&dir->d_lock); /* probably unneeded */ | |
946e51f2 | 767 | list_for_each_entry(child, &dir->d_subdirs, d_child) { |
7682c918 DH |
768 | if (d_really_is_positive(child)) /* probably unneeded */ |
769 | d_inode(child)->i_private = NULL; | |
bf682c31 ON |
770 | } |
771 | spin_unlock(&dir->d_lock); | |
772 | ||
8434dc93 | 773 | tracefs_remove_recursive(dir); |
bf682c31 ON |
774 | } |
775 | ||
f6a84bdc | 776 | list_del(&file->list); |
f6a84bdc | 777 | remove_subsystem(file->system); |
2448e349 | 778 | free_event_filter(file->filter); |
f6a84bdc ON |
779 | kmem_cache_free(file_cachep, file); |
780 | } | |
781 | ||
8f31bfe5 LZ |
782 | /* |
783 | * __ftrace_set_clr_event(NULL, NULL, NULL, set) will set/unset all events. | |
784 | */ | |
2a6c24af SRRH |
785 | static int |
786 | __ftrace_set_clr_event_nolock(struct trace_array *tr, const char *match, | |
787 | const char *sub, const char *event, int set) | |
b77e38aa | 788 | { |
7f1d2f82 | 789 | struct trace_event_file *file; |
2425bcb9 | 790 | struct trace_event_call *call; |
de7b2973 | 791 | const char *name; |
29f93943 | 792 | int ret = -EINVAL; |
8f31bfe5 | 793 | |
ae63b31e SR |
794 | list_for_each_entry(file, &tr->events, list) { |
795 | ||
796 | call = file->event_call; | |
687fcc4a | 797 | name = trace_event_name(call); |
8f31bfe5 | 798 | |
de7b2973 | 799 | if (!name || !call->class || !call->class->reg) |
8f31bfe5 LZ |
800 | continue; |
801 | ||
9b63776f SR |
802 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) |
803 | continue; | |
804 | ||
8f31bfe5 | 805 | if (match && |
de7b2973 | 806 | strcmp(match, name) != 0 && |
8f082018 | 807 | strcmp(match, call->class->system) != 0) |
8f31bfe5 LZ |
808 | continue; |
809 | ||
8f082018 | 810 | if (sub && strcmp(sub, call->class->system) != 0) |
8f31bfe5 LZ |
811 | continue; |
812 | ||
de7b2973 | 813 | if (event && strcmp(event, name) != 0) |
8f31bfe5 LZ |
814 | continue; |
815 | ||
ae63b31e | 816 | ftrace_event_enable_disable(file, set); |
8f31bfe5 LZ |
817 | |
818 | ret = 0; | |
819 | } | |
2a6c24af SRRH |
820 | |
821 | return ret; | |
822 | } | |
823 | ||
824 | static int __ftrace_set_clr_event(struct trace_array *tr, const char *match, | |
825 | const char *sub, const char *event, int set) | |
826 | { | |
827 | int ret; | |
828 | ||
829 | mutex_lock(&event_mutex); | |
830 | ret = __ftrace_set_clr_event_nolock(tr, match, sub, event, set); | |
8f31bfe5 LZ |
831 | mutex_unlock(&event_mutex); |
832 | ||
833 | return ret; | |
834 | } | |
835 | ||
ae63b31e | 836 | static int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set) |
8f31bfe5 | 837 | { |
b628b3e6 | 838 | char *event = NULL, *sub = NULL, *match; |
84fce9db | 839 | int ret; |
b628b3e6 SR |
840 | |
841 | /* | |
842 | * The buf format can be <subsystem>:<event-name> | |
843 | * *:<event-name> means any event by that name. | |
844 | * :<event-name> is the same. | |
845 | * | |
846 | * <subsystem>:* means all events in that subsystem | |
847 | * <subsystem>: means the same. | |
848 | * | |
849 | * <name> (no ':') means all events in a subsystem with | |
850 | * the name <name> or any event that matches <name> | |
851 | */ | |
852 | ||
853 | match = strsep(&buf, ":"); | |
854 | if (buf) { | |
855 | sub = match; | |
856 | event = buf; | |
857 | match = NULL; | |
858 | ||
859 | if (!strlen(sub) || strcmp(sub, "*") == 0) | |
860 | sub = NULL; | |
861 | if (!strlen(event) || strcmp(event, "*") == 0) | |
862 | event = NULL; | |
863 | } | |
b77e38aa | 864 | |
84fce9db JK |
865 | ret = __ftrace_set_clr_event(tr, match, sub, event, set); |
866 | ||
867 | /* Put back the colon to allow this to be called again */ | |
868 | if (buf) | |
869 | *(buf - 1) = ':'; | |
870 | ||
871 | return ret; | |
b77e38aa SR |
872 | } |
873 | ||
4671c794 SR |
874 | /** |
875 | * trace_set_clr_event - enable or disable an event | |
876 | * @system: system name to match (NULL for any system) | |
877 | * @event: event name to match (NULL for all events, within system) | |
878 | * @set: 1 to enable, 0 to disable | |
879 | * | |
880 | * This is a way for other parts of the kernel to enable or disable | |
881 | * event recording. | |
882 | * | |
883 | * Returns 0 on success, -EINVAL if the parameters do not match any | |
884 | * registered events. | |
885 | */ | |
886 | int trace_set_clr_event(const char *system, const char *event, int set) | |
887 | { | |
ae63b31e SR |
888 | struct trace_array *tr = top_trace_array(); |
889 | ||
dc81e5e3 YY |
890 | if (!tr) |
891 | return -ENODEV; | |
892 | ||
ae63b31e | 893 | return __ftrace_set_clr_event(tr, NULL, system, event, set); |
4671c794 | 894 | } |
56355b83 | 895 | EXPORT_SYMBOL_GPL(trace_set_clr_event); |
4671c794 | 896 | |
b77e38aa SR |
897 | /* 128 should be much more than enough */ |
898 | #define EVENT_BUF_SIZE 127 | |
899 | ||
900 | static ssize_t | |
901 | ftrace_event_write(struct file *file, const char __user *ubuf, | |
902 | size_t cnt, loff_t *ppos) | |
903 | { | |
48966364 | 904 | struct trace_parser parser; |
ae63b31e SR |
905 | struct seq_file *m = file->private_data; |
906 | struct trace_array *tr = m->private; | |
4ba7978e | 907 | ssize_t read, ret; |
b77e38aa | 908 | |
4ba7978e | 909 | if (!cnt) |
b77e38aa SR |
910 | return 0; |
911 | ||
1852fcce SR |
912 | ret = tracing_update_buffers(); |
913 | if (ret < 0) | |
914 | return ret; | |
915 | ||
48966364 | 916 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) |
b77e38aa SR |
917 | return -ENOMEM; |
918 | ||
48966364 | 919 | read = trace_get_user(&parser, ubuf, cnt, ppos); |
920 | ||
4ba7978e | 921 | if (read >= 0 && trace_parser_loaded((&parser))) { |
48966364 | 922 | int set = 1; |
b77e38aa | 923 | |
48966364 | 924 | if (*parser.buffer == '!') |
b77e38aa | 925 | set = 0; |
b77e38aa | 926 | |
48966364 | 927 | parser.buffer[parser.idx] = 0; |
928 | ||
ae63b31e | 929 | ret = ftrace_set_clr_event(tr, parser.buffer + !set, set); |
b77e38aa | 930 | if (ret) |
48966364 | 931 | goto out_put; |
b77e38aa | 932 | } |
b77e38aa SR |
933 | |
934 | ret = read; | |
935 | ||
48966364 | 936 | out_put: |
937 | trace_parser_put(&parser); | |
b77e38aa SR |
938 | |
939 | return ret; | |
940 | } | |
941 | ||
942 | static void * | |
943 | t_next(struct seq_file *m, void *v, loff_t *pos) | |
944 | { | |
7f1d2f82 | 945 | struct trace_event_file *file = v; |
2425bcb9 | 946 | struct trace_event_call *call; |
ae63b31e | 947 | struct trace_array *tr = m->private; |
b77e38aa SR |
948 | |
949 | (*pos)++; | |
950 | ||
ae63b31e SR |
951 | list_for_each_entry_continue(file, &tr->events, list) { |
952 | call = file->event_call; | |
40e26815 SR |
953 | /* |
954 | * The ftrace subsystem is for showing formats only. | |
955 | * They can not be enabled or disabled via the event files. | |
956 | */ | |
d045437a SRRH |
957 | if (call->class && call->class->reg && |
958 | !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
ae63b31e | 959 | return file; |
40e26815 | 960 | } |
b77e38aa | 961 | |
30bd39cd | 962 | return NULL; |
b77e38aa SR |
963 | } |
964 | ||
965 | static void *t_start(struct seq_file *m, loff_t *pos) | |
966 | { | |
7f1d2f82 | 967 | struct trace_event_file *file; |
ae63b31e | 968 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
969 | loff_t l; |
970 | ||
20c8928a | 971 | mutex_lock(&event_mutex); |
e1c7e2a6 | 972 | |
7f1d2f82 | 973 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 974 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
975 | file = t_next(m, file, &l); |
976 | if (!file) | |
e1c7e2a6 LZ |
977 | break; |
978 | } | |
ae63b31e | 979 | return file; |
b77e38aa SR |
980 | } |
981 | ||
982 | static void * | |
983 | s_next(struct seq_file *m, void *v, loff_t *pos) | |
984 | { | |
7f1d2f82 | 985 | struct trace_event_file *file = v; |
ae63b31e | 986 | struct trace_array *tr = m->private; |
b77e38aa SR |
987 | |
988 | (*pos)++; | |
989 | ||
ae63b31e | 990 | list_for_each_entry_continue(file, &tr->events, list) { |
5d6ad960 | 991 | if (file->flags & EVENT_FILE_FL_ENABLED) |
ae63b31e | 992 | return file; |
b77e38aa SR |
993 | } |
994 | ||
30bd39cd | 995 | return NULL; |
b77e38aa SR |
996 | } |
997 | ||
998 | static void *s_start(struct seq_file *m, loff_t *pos) | |
999 | { | |
7f1d2f82 | 1000 | struct trace_event_file *file; |
ae63b31e | 1001 | struct trace_array *tr = m->private; |
e1c7e2a6 LZ |
1002 | loff_t l; |
1003 | ||
20c8928a | 1004 | mutex_lock(&event_mutex); |
e1c7e2a6 | 1005 | |
7f1d2f82 | 1006 | file = list_entry(&tr->events, struct trace_event_file, list); |
e1c7e2a6 | 1007 | for (l = 0; l <= *pos; ) { |
ae63b31e SR |
1008 | file = s_next(m, file, &l); |
1009 | if (!file) | |
e1c7e2a6 LZ |
1010 | break; |
1011 | } | |
ae63b31e | 1012 | return file; |
b77e38aa SR |
1013 | } |
1014 | ||
1015 | static int t_show(struct seq_file *m, void *v) | |
1016 | { | |
7f1d2f82 | 1017 | struct trace_event_file *file = v; |
2425bcb9 | 1018 | struct trace_event_call *call = file->event_call; |
b77e38aa | 1019 | |
8f082018 SR |
1020 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) |
1021 | seq_printf(m, "%s:", call->class->system); | |
687fcc4a | 1022 | seq_printf(m, "%s\n", trace_event_name(call)); |
b77e38aa SR |
1023 | |
1024 | return 0; | |
1025 | } | |
1026 | ||
1027 | static void t_stop(struct seq_file *m, void *p) | |
1028 | { | |
20c8928a | 1029 | mutex_unlock(&event_mutex); |
b77e38aa SR |
1030 | } |
1031 | ||
f4d34a87 SR |
1032 | static void * |
1033 | p_next(struct seq_file *m, void *v, loff_t *pos) | |
1034 | { | |
1035 | struct trace_array *tr = m->private; | |
1036 | struct trace_pid_list *pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1037 | unsigned long pid = (unsigned long)v; | |
1038 | ||
1039 | (*pos)++; | |
1040 | ||
1041 | /* pid already is +1 of the actual prevous bit */ | |
1042 | pid = find_next_bit(pid_list->pids, pid_list->pid_max, pid); | |
1043 | ||
1044 | /* Return pid + 1 to allow zero to be represented */ | |
1045 | if (pid < pid_list->pid_max) | |
1046 | return (void *)(pid + 1); | |
1047 | ||
1048 | return NULL; | |
1049 | } | |
1050 | ||
49090107 | 1051 | static void *p_start(struct seq_file *m, loff_t *pos) |
fb662288 | 1052 | __acquires(RCU) |
49090107 SRRH |
1053 | { |
1054 | struct trace_pid_list *pid_list; | |
1055 | struct trace_array *tr = m->private; | |
f4d34a87 SR |
1056 | unsigned long pid; |
1057 | loff_t l = 0; | |
49090107 SRRH |
1058 | |
1059 | /* | |
1060 | * Grab the mutex, to keep calls to p_next() having the same | |
1061 | * tr->filtered_pids as p_start() has. | |
1062 | * If we just passed the tr->filtered_pids around, then RCU would | |
1063 | * have been enough, but doing that makes things more complex. | |
1064 | */ | |
1065 | mutex_lock(&event_mutex); | |
1066 | rcu_read_lock_sched(); | |
1067 | ||
1068 | pid_list = rcu_dereference_sched(tr->filtered_pids); | |
1069 | ||
f4d34a87 | 1070 | if (!pid_list) |
49090107 SRRH |
1071 | return NULL; |
1072 | ||
f4d34a87 SR |
1073 | pid = find_first_bit(pid_list->pids, pid_list->pid_max); |
1074 | if (pid >= pid_list->pid_max) | |
49090107 SRRH |
1075 | return NULL; |
1076 | ||
f4d34a87 SR |
1077 | /* Return pid + 1 so that zero can be the exit value */ |
1078 | for (pid++; pid && l < *pos; | |
1079 | pid = (unsigned long)p_next(m, (void *)pid, &l)) | |
1080 | ; | |
1081 | return (void *)pid; | |
49090107 SRRH |
1082 | } |
1083 | ||
1084 | static void p_stop(struct seq_file *m, void *p) | |
fb662288 | 1085 | __releases(RCU) |
49090107 SRRH |
1086 | { |
1087 | rcu_read_unlock_sched(); | |
1088 | mutex_unlock(&event_mutex); | |
1089 | } | |
1090 | ||
49090107 SRRH |
1091 | static int p_show(struct seq_file *m, void *v) |
1092 | { | |
f4d34a87 | 1093 | unsigned long pid = (unsigned long)v - 1; |
49090107 | 1094 | |
f4d34a87 | 1095 | seq_printf(m, "%lu\n", pid); |
49090107 SRRH |
1096 | return 0; |
1097 | } | |
1098 | ||
1473e441 SR |
1099 | static ssize_t |
1100 | event_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1101 | loff_t *ppos) | |
1102 | { | |
7f1d2f82 | 1103 | struct trace_event_file *file; |
bc6f6b08 | 1104 | unsigned long flags; |
a4390596 TZ |
1105 | char buf[4] = "0"; |
1106 | ||
bc6f6b08 ON |
1107 | mutex_lock(&event_mutex); |
1108 | file = event_file_data(filp); | |
1109 | if (likely(file)) | |
1110 | flags = file->flags; | |
1111 | mutex_unlock(&event_mutex); | |
1112 | ||
1113 | if (!file) | |
1114 | return -ENODEV; | |
1115 | ||
5d6ad960 SRRH |
1116 | if (flags & EVENT_FILE_FL_ENABLED && |
1117 | !(flags & EVENT_FILE_FL_SOFT_DISABLED)) | |
a4390596 TZ |
1118 | strcpy(buf, "1"); |
1119 | ||
5d6ad960 SRRH |
1120 | if (flags & EVENT_FILE_FL_SOFT_DISABLED || |
1121 | flags & EVENT_FILE_FL_SOFT_MODE) | |
a4390596 TZ |
1122 | strcat(buf, "*"); |
1123 | ||
1124 | strcat(buf, "\n"); | |
1473e441 | 1125 | |
417944c4 | 1126 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, strlen(buf)); |
1473e441 SR |
1127 | } |
1128 | ||
1129 | static ssize_t | |
1130 | event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1131 | loff_t *ppos) | |
1132 | { | |
7f1d2f82 | 1133 | struct trace_event_file *file; |
1473e441 SR |
1134 | unsigned long val; |
1135 | int ret; | |
1136 | ||
22fe9b54 PH |
1137 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1138 | if (ret) | |
1473e441 SR |
1139 | return ret; |
1140 | ||
1852fcce SR |
1141 | ret = tracing_update_buffers(); |
1142 | if (ret < 0) | |
1143 | return ret; | |
1144 | ||
1473e441 SR |
1145 | switch (val) { |
1146 | case 0: | |
1473e441 | 1147 | case 1: |
bc6f6b08 | 1148 | ret = -ENODEV; |
11a241a3 | 1149 | mutex_lock(&event_mutex); |
bc6f6b08 ON |
1150 | file = event_file_data(filp); |
1151 | if (likely(file)) | |
1152 | ret = ftrace_event_enable_disable(file, val); | |
11a241a3 | 1153 | mutex_unlock(&event_mutex); |
1473e441 SR |
1154 | break; |
1155 | ||
1156 | default: | |
1157 | return -EINVAL; | |
1158 | } | |
1159 | ||
1160 | *ppos += cnt; | |
1161 | ||
3b8e4273 | 1162 | return ret ? ret : cnt; |
1473e441 SR |
1163 | } |
1164 | ||
8ae79a13 SR |
1165 | static ssize_t |
1166 | system_enable_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1167 | loff_t *ppos) | |
1168 | { | |
c142b15d | 1169 | const char set_to_char[4] = { '?', '0', '1', 'X' }; |
7967b3e0 | 1170 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1171 | struct event_subsystem *system = dir->subsystem; |
2425bcb9 | 1172 | struct trace_event_call *call; |
7f1d2f82 | 1173 | struct trace_event_file *file; |
ae63b31e | 1174 | struct trace_array *tr = dir->tr; |
8ae79a13 | 1175 | char buf[2]; |
c142b15d | 1176 | int set = 0; |
8ae79a13 SR |
1177 | int ret; |
1178 | ||
8ae79a13 | 1179 | mutex_lock(&event_mutex); |
ae63b31e SR |
1180 | list_for_each_entry(file, &tr->events, list) { |
1181 | call = file->event_call; | |
687fcc4a | 1182 | if (!trace_event_name(call) || !call->class || !call->class->reg) |
8ae79a13 SR |
1183 | continue; |
1184 | ||
40ee4dff | 1185 | if (system && strcmp(call->class->system, system->name) != 0) |
8ae79a13 SR |
1186 | continue; |
1187 | ||
1188 | /* | |
1189 | * We need to find out if all the events are set | |
1190 | * or if all events or cleared, or if we have | |
1191 | * a mixture. | |
1192 | */ | |
5d6ad960 | 1193 | set |= (1 << !!(file->flags & EVENT_FILE_FL_ENABLED)); |
c142b15d | 1194 | |
8ae79a13 SR |
1195 | /* |
1196 | * If we have a mixture, no need to look further. | |
1197 | */ | |
c142b15d | 1198 | if (set == 3) |
8ae79a13 SR |
1199 | break; |
1200 | } | |
1201 | mutex_unlock(&event_mutex); | |
1202 | ||
c142b15d | 1203 | buf[0] = set_to_char[set]; |
8ae79a13 | 1204 | buf[1] = '\n'; |
8ae79a13 SR |
1205 | |
1206 | ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, 2); | |
1207 | ||
1208 | return ret; | |
1209 | } | |
1210 | ||
1211 | static ssize_t | |
1212 | system_enable_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1213 | loff_t *ppos) | |
1214 | { | |
7967b3e0 | 1215 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1216 | struct event_subsystem *system = dir->subsystem; |
40ee4dff | 1217 | const char *name = NULL; |
8ae79a13 | 1218 | unsigned long val; |
8ae79a13 SR |
1219 | ssize_t ret; |
1220 | ||
22fe9b54 PH |
1221 | ret = kstrtoul_from_user(ubuf, cnt, 10, &val); |
1222 | if (ret) | |
8ae79a13 SR |
1223 | return ret; |
1224 | ||
1225 | ret = tracing_update_buffers(); | |
1226 | if (ret < 0) | |
1227 | return ret; | |
1228 | ||
8f31bfe5 | 1229 | if (val != 0 && val != 1) |
8ae79a13 | 1230 | return -EINVAL; |
8ae79a13 | 1231 | |
40ee4dff SR |
1232 | /* |
1233 | * Opening of "enable" adds a ref count to system, | |
1234 | * so the name is safe to use. | |
1235 | */ | |
1236 | if (system) | |
1237 | name = system->name; | |
1238 | ||
ae63b31e | 1239 | ret = __ftrace_set_clr_event(dir->tr, NULL, name, NULL, val); |
8ae79a13 | 1240 | if (ret) |
8f31bfe5 | 1241 | goto out; |
8ae79a13 SR |
1242 | |
1243 | ret = cnt; | |
1244 | ||
8f31bfe5 | 1245 | out: |
8ae79a13 SR |
1246 | *ppos += cnt; |
1247 | ||
1248 | return ret; | |
1249 | } | |
1250 | ||
2a37a3df SR |
1251 | enum { |
1252 | FORMAT_HEADER = 1, | |
86397dc3 LZ |
1253 | FORMAT_FIELD_SEPERATOR = 2, |
1254 | FORMAT_PRINTFMT = 3, | |
2a37a3df SR |
1255 | }; |
1256 | ||
1257 | static void *f_next(struct seq_file *m, void *v, loff_t *pos) | |
981d081e | 1258 | { |
2425bcb9 | 1259 | struct trace_event_call *call = event_file_data(m->private); |
86397dc3 LZ |
1260 | struct list_head *common_head = &ftrace_common_fields; |
1261 | struct list_head *head = trace_get_fields(call); | |
7710b639 | 1262 | struct list_head *node = v; |
981d081e | 1263 | |
2a37a3df | 1264 | (*pos)++; |
5a65e956 | 1265 | |
2a37a3df SR |
1266 | switch ((unsigned long)v) { |
1267 | case FORMAT_HEADER: | |
7710b639 ON |
1268 | node = common_head; |
1269 | break; | |
5a65e956 | 1270 | |
86397dc3 | 1271 | case FORMAT_FIELD_SEPERATOR: |
7710b639 ON |
1272 | node = head; |
1273 | break; | |
5a65e956 | 1274 | |
2a37a3df SR |
1275 | case FORMAT_PRINTFMT: |
1276 | /* all done */ | |
1277 | return NULL; | |
5a65e956 LJ |
1278 | } |
1279 | ||
7710b639 ON |
1280 | node = node->prev; |
1281 | if (node == common_head) | |
86397dc3 | 1282 | return (void *)FORMAT_FIELD_SEPERATOR; |
7710b639 | 1283 | else if (node == head) |
2a37a3df | 1284 | return (void *)FORMAT_PRINTFMT; |
7710b639 ON |
1285 | else |
1286 | return node; | |
2a37a3df SR |
1287 | } |
1288 | ||
1289 | static int f_show(struct seq_file *m, void *v) | |
1290 | { | |
2425bcb9 | 1291 | struct trace_event_call *call = event_file_data(m->private); |
2a37a3df SR |
1292 | struct ftrace_event_field *field; |
1293 | const char *array_descriptor; | |
1294 | ||
1295 | switch ((unsigned long)v) { | |
1296 | case FORMAT_HEADER: | |
687fcc4a | 1297 | seq_printf(m, "name: %s\n", trace_event_name(call)); |
2a37a3df | 1298 | seq_printf(m, "ID: %d\n", call->event.type); |
fa6f0cc7 | 1299 | seq_puts(m, "format:\n"); |
8728fe50 | 1300 | return 0; |
5a65e956 | 1301 | |
86397dc3 LZ |
1302 | case FORMAT_FIELD_SEPERATOR: |
1303 | seq_putc(m, '\n'); | |
1304 | return 0; | |
1305 | ||
2a37a3df SR |
1306 | case FORMAT_PRINTFMT: |
1307 | seq_printf(m, "\nprint fmt: %s\n", | |
1308 | call->print_fmt); | |
1309 | return 0; | |
981d081e | 1310 | } |
8728fe50 | 1311 | |
7710b639 | 1312 | field = list_entry(v, struct ftrace_event_field, link); |
2a37a3df SR |
1313 | /* |
1314 | * Smartly shows the array type(except dynamic array). | |
1315 | * Normal: | |
1316 | * field:TYPE VAR | |
1317 | * If TYPE := TYPE[LEN], it is shown: | |
1318 | * field:TYPE VAR[LEN] | |
1319 | */ | |
1320 | array_descriptor = strchr(field->type, '['); | |
8728fe50 | 1321 | |
2a37a3df SR |
1322 | if (!strncmp(field->type, "__data_loc", 10)) |
1323 | array_descriptor = NULL; | |
8728fe50 | 1324 | |
2a37a3df SR |
1325 | if (!array_descriptor) |
1326 | seq_printf(m, "\tfield:%s %s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1327 | field->type, field->name, field->offset, | |
1328 | field->size, !!field->is_signed); | |
1329 | else | |
1330 | seq_printf(m, "\tfield:%.*s %s%s;\toffset:%u;\tsize:%u;\tsigned:%d;\n", | |
1331 | (int)(array_descriptor - field->type), | |
1332 | field->type, field->name, | |
1333 | array_descriptor, field->offset, | |
1334 | field->size, !!field->is_signed); | |
8728fe50 | 1335 | |
2a37a3df SR |
1336 | return 0; |
1337 | } | |
5a65e956 | 1338 | |
7710b639 ON |
1339 | static void *f_start(struct seq_file *m, loff_t *pos) |
1340 | { | |
1341 | void *p = (void *)FORMAT_HEADER; | |
1342 | loff_t l = 0; | |
1343 | ||
c5a44a12 ON |
1344 | /* ->stop() is called even if ->start() fails */ |
1345 | mutex_lock(&event_mutex); | |
1346 | if (!event_file_data(m->private)) | |
1347 | return ERR_PTR(-ENODEV); | |
1348 | ||
7710b639 ON |
1349 | while (l < *pos && p) |
1350 | p = f_next(m, p, &l); | |
1351 | ||
1352 | return p; | |
1353 | } | |
1354 | ||
2a37a3df SR |
1355 | static void f_stop(struct seq_file *m, void *p) |
1356 | { | |
c5a44a12 | 1357 | mutex_unlock(&event_mutex); |
2a37a3df | 1358 | } |
981d081e | 1359 | |
2a37a3df SR |
1360 | static const struct seq_operations trace_format_seq_ops = { |
1361 | .start = f_start, | |
1362 | .next = f_next, | |
1363 | .stop = f_stop, | |
1364 | .show = f_show, | |
1365 | }; | |
1366 | ||
1367 | static int trace_format_open(struct inode *inode, struct file *file) | |
1368 | { | |
2a37a3df SR |
1369 | struct seq_file *m; |
1370 | int ret; | |
1371 | ||
1372 | ret = seq_open(file, &trace_format_seq_ops); | |
1373 | if (ret < 0) | |
1374 | return ret; | |
1375 | ||
1376 | m = file->private_data; | |
c5a44a12 | 1377 | m->private = file; |
2a37a3df SR |
1378 | |
1379 | return 0; | |
981d081e SR |
1380 | } |
1381 | ||
23725aee PZ |
1382 | static ssize_t |
1383 | event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1384 | { | |
1a11126b | 1385 | int id = (long)event_file_data(filp); |
cd458ba9 ON |
1386 | char buf[32]; |
1387 | int len; | |
23725aee PZ |
1388 | |
1389 | if (*ppos) | |
1390 | return 0; | |
1391 | ||
1a11126b ON |
1392 | if (unlikely(!id)) |
1393 | return -ENODEV; | |
1394 | ||
1395 | len = sprintf(buf, "%d\n", id); | |
1396 | ||
cd458ba9 | 1397 | return simple_read_from_buffer(ubuf, cnt, ppos, buf, len); |
23725aee PZ |
1398 | } |
1399 | ||
7ce7e424 TZ |
1400 | static ssize_t |
1401 | event_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1402 | loff_t *ppos) | |
1403 | { | |
7f1d2f82 | 1404 | struct trace_event_file *file; |
7ce7e424 | 1405 | struct trace_seq *s; |
e2912b09 | 1406 | int r = -ENODEV; |
7ce7e424 TZ |
1407 | |
1408 | if (*ppos) | |
1409 | return 0; | |
1410 | ||
1411 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
e2912b09 | 1412 | |
7ce7e424 TZ |
1413 | if (!s) |
1414 | return -ENOMEM; | |
1415 | ||
1416 | trace_seq_init(s); | |
1417 | ||
e2912b09 | 1418 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1419 | file = event_file_data(filp); |
1420 | if (file) | |
1421 | print_event_filter(file, s); | |
e2912b09 ON |
1422 | mutex_unlock(&event_mutex); |
1423 | ||
f306cc82 | 1424 | if (file) |
5ac48378 SRRH |
1425 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1426 | s->buffer, trace_seq_used(s)); | |
7ce7e424 TZ |
1427 | |
1428 | kfree(s); | |
1429 | ||
1430 | return r; | |
1431 | } | |
1432 | ||
1433 | static ssize_t | |
1434 | event_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1435 | loff_t *ppos) | |
1436 | { | |
7f1d2f82 | 1437 | struct trace_event_file *file; |
8b372562 | 1438 | char *buf; |
e2912b09 | 1439 | int err = -ENODEV; |
7ce7e424 | 1440 | |
8b372562 | 1441 | if (cnt >= PAGE_SIZE) |
7ce7e424 TZ |
1442 | return -EINVAL; |
1443 | ||
70f6cbb6 AV |
1444 | buf = memdup_user_nul(ubuf, cnt); |
1445 | if (IS_ERR(buf)) | |
1446 | return PTR_ERR(buf); | |
7ce7e424 | 1447 | |
e2912b09 | 1448 | mutex_lock(&event_mutex); |
f306cc82 TZ |
1449 | file = event_file_data(filp); |
1450 | if (file) | |
1451 | err = apply_event_filter(file, buf); | |
e2912b09 ON |
1452 | mutex_unlock(&event_mutex); |
1453 | ||
70f6cbb6 | 1454 | kfree(buf); |
8b372562 | 1455 | if (err < 0) |
44e9c8b7 | 1456 | return err; |
0a19e53c | 1457 | |
7ce7e424 TZ |
1458 | *ppos += cnt; |
1459 | ||
1460 | return cnt; | |
1461 | } | |
1462 | ||
e9dbfae5 SR |
1463 | static LIST_HEAD(event_subsystems); |
1464 | ||
1465 | static int subsystem_open(struct inode *inode, struct file *filp) | |
1466 | { | |
1467 | struct event_subsystem *system = NULL; | |
7967b3e0 | 1468 | struct trace_subsystem_dir *dir = NULL; /* Initialize for gcc */ |
ae63b31e | 1469 | struct trace_array *tr; |
e9dbfae5 SR |
1470 | int ret; |
1471 | ||
d6d3523c GB |
1472 | if (tracing_is_disabled()) |
1473 | return -ENODEV; | |
1474 | ||
e9dbfae5 | 1475 | /* Make sure the system still exists */ |
a8227415 | 1476 | mutex_lock(&trace_types_lock); |
e9dbfae5 | 1477 | mutex_lock(&event_mutex); |
ae63b31e SR |
1478 | list_for_each_entry(tr, &ftrace_trace_arrays, list) { |
1479 | list_for_each_entry(dir, &tr->systems, list) { | |
1480 | if (dir == inode->i_private) { | |
1481 | /* Don't open systems with no events */ | |
1482 | if (dir->nr_events) { | |
1483 | __get_system_dir(dir); | |
1484 | system = dir->subsystem; | |
1485 | } | |
1486 | goto exit_loop; | |
e9dbfae5 | 1487 | } |
e9dbfae5 SR |
1488 | } |
1489 | } | |
ae63b31e | 1490 | exit_loop: |
e9dbfae5 | 1491 | mutex_unlock(&event_mutex); |
a8227415 | 1492 | mutex_unlock(&trace_types_lock); |
e9dbfae5 | 1493 | |
ae63b31e | 1494 | if (!system) |
e9dbfae5 SR |
1495 | return -ENODEV; |
1496 | ||
ae63b31e SR |
1497 | /* Some versions of gcc think dir can be uninitialized here */ |
1498 | WARN_ON(!dir); | |
1499 | ||
8e2e2fa4 SRRH |
1500 | /* Still need to increment the ref count of the system */ |
1501 | if (trace_array_get(tr) < 0) { | |
1502 | put_system(dir); | |
1503 | return -ENODEV; | |
1504 | } | |
1505 | ||
e9dbfae5 | 1506 | ret = tracing_open_generic(inode, filp); |
8e2e2fa4 SRRH |
1507 | if (ret < 0) { |
1508 | trace_array_put(tr); | |
ae63b31e | 1509 | put_system(dir); |
8e2e2fa4 | 1510 | } |
ae63b31e SR |
1511 | |
1512 | return ret; | |
1513 | } | |
1514 | ||
1515 | static int system_tr_open(struct inode *inode, struct file *filp) | |
1516 | { | |
7967b3e0 | 1517 | struct trace_subsystem_dir *dir; |
ae63b31e SR |
1518 | struct trace_array *tr = inode->i_private; |
1519 | int ret; | |
1520 | ||
d6d3523c GB |
1521 | if (tracing_is_disabled()) |
1522 | return -ENODEV; | |
1523 | ||
8e2e2fa4 SRRH |
1524 | if (trace_array_get(tr) < 0) |
1525 | return -ENODEV; | |
1526 | ||
ae63b31e SR |
1527 | /* Make a temporary dir that has no system but points to tr */ |
1528 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); | |
8e2e2fa4 SRRH |
1529 | if (!dir) { |
1530 | trace_array_put(tr); | |
ae63b31e | 1531 | return -ENOMEM; |
8e2e2fa4 | 1532 | } |
ae63b31e SR |
1533 | |
1534 | dir->tr = tr; | |
1535 | ||
1536 | ret = tracing_open_generic(inode, filp); | |
8e2e2fa4 SRRH |
1537 | if (ret < 0) { |
1538 | trace_array_put(tr); | |
ae63b31e | 1539 | kfree(dir); |
d6d3523c | 1540 | return ret; |
8e2e2fa4 | 1541 | } |
ae63b31e SR |
1542 | |
1543 | filp->private_data = dir; | |
e9dbfae5 | 1544 | |
d6d3523c | 1545 | return 0; |
e9dbfae5 SR |
1546 | } |
1547 | ||
1548 | static int subsystem_release(struct inode *inode, struct file *file) | |
1549 | { | |
7967b3e0 | 1550 | struct trace_subsystem_dir *dir = file->private_data; |
e9dbfae5 | 1551 | |
8e2e2fa4 SRRH |
1552 | trace_array_put(dir->tr); |
1553 | ||
ae63b31e SR |
1554 | /* |
1555 | * If dir->subsystem is NULL, then this is a temporary | |
1556 | * descriptor that was made for a trace_array to enable | |
1557 | * all subsystems. | |
1558 | */ | |
1559 | if (dir->subsystem) | |
1560 | put_system(dir); | |
1561 | else | |
1562 | kfree(dir); | |
e9dbfae5 SR |
1563 | |
1564 | return 0; | |
1565 | } | |
1566 | ||
cfb180f3 TZ |
1567 | static ssize_t |
1568 | subsystem_filter_read(struct file *filp, char __user *ubuf, size_t cnt, | |
1569 | loff_t *ppos) | |
1570 | { | |
7967b3e0 | 1571 | struct trace_subsystem_dir *dir = filp->private_data; |
ae63b31e | 1572 | struct event_subsystem *system = dir->subsystem; |
cfb180f3 TZ |
1573 | struct trace_seq *s; |
1574 | int r; | |
1575 | ||
1576 | if (*ppos) | |
1577 | return 0; | |
1578 | ||
1579 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1580 | if (!s) | |
1581 | return -ENOMEM; | |
1582 | ||
1583 | trace_seq_init(s); | |
1584 | ||
8b372562 | 1585 | print_subsystem_event_filter(system, s); |
5ac48378 SRRH |
1586 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1587 | s->buffer, trace_seq_used(s)); | |
cfb180f3 TZ |
1588 | |
1589 | kfree(s); | |
1590 | ||
1591 | return r; | |
1592 | } | |
1593 | ||
1594 | static ssize_t | |
1595 | subsystem_filter_write(struct file *filp, const char __user *ubuf, size_t cnt, | |
1596 | loff_t *ppos) | |
1597 | { | |
7967b3e0 | 1598 | struct trace_subsystem_dir *dir = filp->private_data; |
8b372562 | 1599 | char *buf; |
cfb180f3 TZ |
1600 | int err; |
1601 | ||
8b372562 | 1602 | if (cnt >= PAGE_SIZE) |
cfb180f3 TZ |
1603 | return -EINVAL; |
1604 | ||
70f6cbb6 AV |
1605 | buf = memdup_user_nul(ubuf, cnt); |
1606 | if (IS_ERR(buf)) | |
1607 | return PTR_ERR(buf); | |
cfb180f3 | 1608 | |
ae63b31e | 1609 | err = apply_subsystem_event_filter(dir, buf); |
70f6cbb6 | 1610 | kfree(buf); |
8b372562 | 1611 | if (err < 0) |
44e9c8b7 | 1612 | return err; |
cfb180f3 TZ |
1613 | |
1614 | *ppos += cnt; | |
1615 | ||
1616 | return cnt; | |
1617 | } | |
1618 | ||
d1b182a8 SR |
1619 | static ssize_t |
1620 | show_header(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos) | |
1621 | { | |
1622 | int (*func)(struct trace_seq *s) = filp->private_data; | |
1623 | struct trace_seq *s; | |
1624 | int r; | |
1625 | ||
1626 | if (*ppos) | |
1627 | return 0; | |
1628 | ||
1629 | s = kmalloc(sizeof(*s), GFP_KERNEL); | |
1630 | if (!s) | |
1631 | return -ENOMEM; | |
1632 | ||
1633 | trace_seq_init(s); | |
1634 | ||
1635 | func(s); | |
5ac48378 SRRH |
1636 | r = simple_read_from_buffer(ubuf, cnt, ppos, |
1637 | s->buffer, trace_seq_used(s)); | |
d1b182a8 SR |
1638 | |
1639 | kfree(s); | |
1640 | ||
1641 | return r; | |
1642 | } | |
1643 | ||
8ca532ad SRRH |
1644 | static void ignore_task_cpu(void *data) |
1645 | { | |
1646 | struct trace_array *tr = data; | |
1647 | struct trace_pid_list *pid_list; | |
1648 | ||
1649 | /* | |
1650 | * This function is called by on_each_cpu() while the | |
1651 | * event_mutex is held. | |
1652 | */ | |
1653 | pid_list = rcu_dereference_protected(tr->filtered_pids, | |
1654 | mutex_is_locked(&event_mutex)); | |
1655 | ||
1656 | this_cpu_write(tr->trace_buffer.data->ignore_pid, | |
9ebc57cf | 1657 | ignore_this_task(pid_list, current)); |
8ca532ad SRRH |
1658 | } |
1659 | ||
49090107 | 1660 | static ssize_t |
3fdaf80f | 1661 | ftrace_event_pid_write(struct file *filp, const char __user *ubuf, |
49090107 SRRH |
1662 | size_t cnt, loff_t *ppos) |
1663 | { | |
3fdaf80f | 1664 | struct seq_file *m = filp->private_data; |
49090107 SRRH |
1665 | struct trace_array *tr = m->private; |
1666 | struct trace_pid_list *filtered_pids = NULL; | |
f4d34a87 | 1667 | struct trace_pid_list *pid_list; |
3fdaf80f | 1668 | struct trace_event_file *file; |
49090107 SRRH |
1669 | struct trace_parser parser; |
1670 | unsigned long val; | |
1671 | loff_t this_pos; | |
1672 | ssize_t read = 0; | |
1673 | ssize_t ret = 0; | |
1674 | pid_t pid; | |
f4d34a87 | 1675 | int nr_pids = 0; |
49090107 SRRH |
1676 | |
1677 | if (!cnt) | |
1678 | return 0; | |
1679 | ||
1680 | ret = tracing_update_buffers(); | |
1681 | if (ret < 0) | |
1682 | return ret; | |
1683 | ||
1684 | if (trace_parser_get_init(&parser, EVENT_BUF_SIZE + 1)) | |
1685 | return -ENOMEM; | |
1686 | ||
1687 | mutex_lock(&event_mutex); | |
f4d34a87 SR |
1688 | filtered_pids = rcu_dereference_protected(tr->filtered_pids, |
1689 | lockdep_is_held(&event_mutex)); | |
1690 | ||
49090107 | 1691 | /* |
f4d34a87 SR |
1692 | * Always recreate a new array. The write is an all or nothing |
1693 | * operation. Always create a new array when adding new pids by | |
1694 | * the user. If the operation fails, then the current list is | |
1695 | * not modified. | |
49090107 | 1696 | */ |
f4d34a87 SR |
1697 | pid_list = kmalloc(sizeof(*pid_list), GFP_KERNEL); |
1698 | if (!pid_list) { | |
1699 | read = -ENOMEM; | |
1700 | goto out; | |
1701 | } | |
1702 | pid_list->pid_max = READ_ONCE(pid_max); | |
1703 | /* Only truncating will shrink pid_max */ | |
1704 | if (filtered_pids && filtered_pids->pid_max > pid_list->pid_max) | |
1705 | pid_list->pid_max = filtered_pids->pid_max; | |
1706 | pid_list->pids = vzalloc((pid_list->pid_max + 7) >> 3); | |
1707 | if (!pid_list->pids) { | |
1708 | kfree(pid_list); | |
1709 | read = -ENOMEM; | |
1710 | goto out; | |
1711 | } | |
1712 | if (filtered_pids) { | |
1713 | /* copy the current bits to the new max */ | |
1714 | pid = find_first_bit(filtered_pids->pids, | |
1715 | filtered_pids->pid_max); | |
1716 | while (pid < filtered_pids->pid_max) { | |
1717 | set_bit(pid, pid_list->pids); | |
1718 | pid = find_next_bit(filtered_pids->pids, | |
1719 | filtered_pids->pid_max, | |
1720 | pid + 1); | |
1721 | nr_pids++; | |
1722 | } | |
1723 | } | |
1724 | ||
49090107 SRRH |
1725 | while (cnt > 0) { |
1726 | ||
1727 | this_pos = 0; | |
1728 | ||
1729 | ret = trace_get_user(&parser, ubuf, cnt, &this_pos); | |
1730 | if (ret < 0 || !trace_parser_loaded(&parser)) | |
1731 | break; | |
1732 | ||
1733 | read += ret; | |
1734 | ubuf += ret; | |
1735 | cnt -= ret; | |
1736 | ||
1737 | parser.buffer[parser.idx] = 0; | |
1738 | ||
1739 | ret = -EINVAL; | |
1740 | if (kstrtoul(parser.buffer, 0, &val)) | |
1741 | break; | |
f4d34a87 | 1742 | if (val >= pid_list->pid_max) |
49090107 SRRH |
1743 | break; |
1744 | ||
1745 | pid = (pid_t)val; | |
1746 | ||
f4d34a87 SR |
1747 | set_bit(pid, pid_list->pids); |
1748 | nr_pids++; | |
49090107 | 1749 | |
49090107 SRRH |
1750 | trace_parser_clear(&parser); |
1751 | ret = 0; | |
1752 | } | |
1753 | trace_parser_put(&parser); | |
1754 | ||
1755 | if (ret < 0) { | |
f4d34a87 | 1756 | vfree(pid_list->pids); |
49090107 | 1757 | kfree(pid_list); |
f4d34a87 SR |
1758 | read = ret; |
1759 | goto out; | |
49090107 SRRH |
1760 | } |
1761 | ||
f4d34a87 SR |
1762 | if (!nr_pids) { |
1763 | /* Cleared the list of pids */ | |
1764 | vfree(pid_list->pids); | |
1765 | kfree(pid_list); | |
1766 | read = ret; | |
1767 | if (!filtered_pids) | |
1768 | goto out; | |
1769 | pid_list = NULL; | |
49090107 | 1770 | } |
49090107 SRRH |
1771 | rcu_assign_pointer(tr->filtered_pids, pid_list); |
1772 | ||
3fdaf80f SRRH |
1773 | list_for_each_entry(file, &tr->events, list) { |
1774 | set_bit(EVENT_FILE_FL_PID_FILTER_BIT, &file->flags); | |
1775 | } | |
49090107 SRRH |
1776 | |
1777 | if (filtered_pids) { | |
1778 | synchronize_sched(); | |
1779 | ||
f4d34a87 | 1780 | vfree(filtered_pids->pids); |
49090107 | 1781 | kfree(filtered_pids); |
3fdaf80f SRRH |
1782 | } else { |
1783 | /* | |
1784 | * Register a probe that is called before all other probes | |
1785 | * to set ignore_pid if next or prev do not match. | |
1786 | * Register a probe this is called after all other probes | |
1787 | * to only keep ignore_pid set if next pid matches. | |
1788 | */ | |
1789 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_pre, | |
1790 | tr, INT_MAX); | |
1791 | register_trace_prio_sched_switch(event_filter_pid_sched_switch_probe_post, | |
1792 | tr, 0); | |
1793 | ||
1794 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_pre, | |
1795 | tr, INT_MAX); | |
1796 | register_trace_prio_sched_wakeup(event_filter_pid_sched_wakeup_probe_post, | |
1797 | tr, 0); | |
0f72e37e SRRH |
1798 | |
1799 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_pre, | |
1800 | tr, INT_MAX); | |
1801 | register_trace_prio_sched_wakeup_new(event_filter_pid_sched_wakeup_probe_post, | |
1802 | tr, 0); | |
1803 | ||
1804 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_pre, | |
1805 | tr, INT_MAX); | |
1806 | register_trace_prio_sched_waking(event_filter_pid_sched_wakeup_probe_post, | |
1807 | tr, 0); | |
49090107 SRRH |
1808 | } |
1809 | ||
799fd44c SRRH |
1810 | /* |
1811 | * Ignoring of pids is done at task switch. But we have to | |
1812 | * check for those tasks that are currently running. | |
1813 | * Always do this in case a pid was appended or removed. | |
1814 | */ | |
1815 | on_each_cpu(ignore_task_cpu, tr, 1); | |
1816 | ||
f4d34a87 | 1817 | out: |
3fdaf80f SRRH |
1818 | mutex_unlock(&event_mutex); |
1819 | ||
49090107 | 1820 | ret = read; |
f4d34a87 SR |
1821 | if (read > 0) |
1822 | *ppos += read; | |
49090107 SRRH |
1823 | |
1824 | return ret; | |
1825 | } | |
1826 | ||
15075cac SR |
1827 | static int ftrace_event_avail_open(struct inode *inode, struct file *file); |
1828 | static int ftrace_event_set_open(struct inode *inode, struct file *file); | |
49090107 | 1829 | static int ftrace_event_set_pid_open(struct inode *inode, struct file *file); |
f77d09a3 | 1830 | static int ftrace_event_release(struct inode *inode, struct file *file); |
15075cac | 1831 | |
b77e38aa SR |
1832 | static const struct seq_operations show_event_seq_ops = { |
1833 | .start = t_start, | |
1834 | .next = t_next, | |
1835 | .show = t_show, | |
1836 | .stop = t_stop, | |
1837 | }; | |
1838 | ||
1839 | static const struct seq_operations show_set_event_seq_ops = { | |
1840 | .start = s_start, | |
1841 | .next = s_next, | |
1842 | .show = t_show, | |
1843 | .stop = t_stop, | |
1844 | }; | |
1845 | ||
49090107 SRRH |
1846 | static const struct seq_operations show_set_pid_seq_ops = { |
1847 | .start = p_start, | |
1848 | .next = p_next, | |
1849 | .show = p_show, | |
1850 | .stop = p_stop, | |
1851 | }; | |
1852 | ||
2314c4ae | 1853 | static const struct file_operations ftrace_avail_fops = { |
15075cac | 1854 | .open = ftrace_event_avail_open, |
2314c4ae SR |
1855 | .read = seq_read, |
1856 | .llseek = seq_lseek, | |
1857 | .release = seq_release, | |
1858 | }; | |
1859 | ||
b77e38aa | 1860 | static const struct file_operations ftrace_set_event_fops = { |
15075cac | 1861 | .open = ftrace_event_set_open, |
b77e38aa SR |
1862 | .read = seq_read, |
1863 | .write = ftrace_event_write, | |
1864 | .llseek = seq_lseek, | |
f77d09a3 | 1865 | .release = ftrace_event_release, |
b77e38aa SR |
1866 | }; |
1867 | ||
49090107 SRRH |
1868 | static const struct file_operations ftrace_set_event_pid_fops = { |
1869 | .open = ftrace_event_set_pid_open, | |
1870 | .read = seq_read, | |
1871 | .write = ftrace_event_pid_write, | |
1872 | .llseek = seq_lseek, | |
1873 | .release = ftrace_event_release, | |
1874 | }; | |
1875 | ||
1473e441 | 1876 | static const struct file_operations ftrace_enable_fops = { |
bf682c31 | 1877 | .open = tracing_open_generic, |
1473e441 SR |
1878 | .read = event_enable_read, |
1879 | .write = event_enable_write, | |
6038f373 | 1880 | .llseek = default_llseek, |
1473e441 SR |
1881 | }; |
1882 | ||
981d081e | 1883 | static const struct file_operations ftrace_event_format_fops = { |
2a37a3df SR |
1884 | .open = trace_format_open, |
1885 | .read = seq_read, | |
1886 | .llseek = seq_lseek, | |
1887 | .release = seq_release, | |
981d081e SR |
1888 | }; |
1889 | ||
23725aee | 1890 | static const struct file_operations ftrace_event_id_fops = { |
23725aee | 1891 | .read = event_id_read, |
6038f373 | 1892 | .llseek = default_llseek, |
23725aee PZ |
1893 | }; |
1894 | ||
7ce7e424 TZ |
1895 | static const struct file_operations ftrace_event_filter_fops = { |
1896 | .open = tracing_open_generic, | |
1897 | .read = event_filter_read, | |
1898 | .write = event_filter_write, | |
6038f373 | 1899 | .llseek = default_llseek, |
7ce7e424 TZ |
1900 | }; |
1901 | ||
cfb180f3 | 1902 | static const struct file_operations ftrace_subsystem_filter_fops = { |
e9dbfae5 | 1903 | .open = subsystem_open, |
cfb180f3 TZ |
1904 | .read = subsystem_filter_read, |
1905 | .write = subsystem_filter_write, | |
6038f373 | 1906 | .llseek = default_llseek, |
e9dbfae5 | 1907 | .release = subsystem_release, |
cfb180f3 TZ |
1908 | }; |
1909 | ||
8ae79a13 | 1910 | static const struct file_operations ftrace_system_enable_fops = { |
40ee4dff | 1911 | .open = subsystem_open, |
8ae79a13 SR |
1912 | .read = system_enable_read, |
1913 | .write = system_enable_write, | |
6038f373 | 1914 | .llseek = default_llseek, |
40ee4dff | 1915 | .release = subsystem_release, |
8ae79a13 SR |
1916 | }; |
1917 | ||
ae63b31e SR |
1918 | static const struct file_operations ftrace_tr_enable_fops = { |
1919 | .open = system_tr_open, | |
1920 | .read = system_enable_read, | |
1921 | .write = system_enable_write, | |
1922 | .llseek = default_llseek, | |
1923 | .release = subsystem_release, | |
1924 | }; | |
1925 | ||
d1b182a8 SR |
1926 | static const struct file_operations ftrace_show_header_fops = { |
1927 | .open = tracing_open_generic, | |
1928 | .read = show_header, | |
6038f373 | 1929 | .llseek = default_llseek, |
d1b182a8 SR |
1930 | }; |
1931 | ||
ae63b31e SR |
1932 | static int |
1933 | ftrace_event_open(struct inode *inode, struct file *file, | |
1934 | const struct seq_operations *seq_ops) | |
1473e441 | 1935 | { |
ae63b31e SR |
1936 | struct seq_file *m; |
1937 | int ret; | |
1473e441 | 1938 | |
ae63b31e SR |
1939 | ret = seq_open(file, seq_ops); |
1940 | if (ret < 0) | |
1941 | return ret; | |
1942 | m = file->private_data; | |
1943 | /* copy tr over to seq ops */ | |
1944 | m->private = inode->i_private; | |
1473e441 | 1945 | |
ae63b31e | 1946 | return ret; |
1473e441 SR |
1947 | } |
1948 | ||
f77d09a3 AL |
1949 | static int ftrace_event_release(struct inode *inode, struct file *file) |
1950 | { | |
1951 | struct trace_array *tr = inode->i_private; | |
1952 | ||
1953 | trace_array_put(tr); | |
1954 | ||
1955 | return seq_release(inode, file); | |
1956 | } | |
1957 | ||
15075cac SR |
1958 | static int |
1959 | ftrace_event_avail_open(struct inode *inode, struct file *file) | |
1960 | { | |
1961 | const struct seq_operations *seq_ops = &show_event_seq_ops; | |
1962 | ||
ae63b31e | 1963 | return ftrace_event_open(inode, file, seq_ops); |
15075cac SR |
1964 | } |
1965 | ||
1966 | static int | |
1967 | ftrace_event_set_open(struct inode *inode, struct file *file) | |
1968 | { | |
1969 | const struct seq_operations *seq_ops = &show_set_event_seq_ops; | |
ae63b31e | 1970 | struct trace_array *tr = inode->i_private; |
f77d09a3 AL |
1971 | int ret; |
1972 | ||
1973 | if (trace_array_get(tr) < 0) | |
1974 | return -ENODEV; | |
15075cac SR |
1975 | |
1976 | if ((file->f_mode & FMODE_WRITE) && | |
1977 | (file->f_flags & O_TRUNC)) | |
ae63b31e | 1978 | ftrace_clear_events(tr); |
15075cac | 1979 | |
f77d09a3 AL |
1980 | ret = ftrace_event_open(inode, file, seq_ops); |
1981 | if (ret < 0) | |
1982 | trace_array_put(tr); | |
1983 | return ret; | |
ae63b31e SR |
1984 | } |
1985 | ||
49090107 SRRH |
1986 | static int |
1987 | ftrace_event_set_pid_open(struct inode *inode, struct file *file) | |
1988 | { | |
1989 | const struct seq_operations *seq_ops = &show_set_pid_seq_ops; | |
1990 | struct trace_array *tr = inode->i_private; | |
1991 | int ret; | |
1992 | ||
1993 | if (trace_array_get(tr) < 0) | |
1994 | return -ENODEV; | |
1995 | ||
1996 | if ((file->f_mode & FMODE_WRITE) && | |
1997 | (file->f_flags & O_TRUNC)) | |
1998 | ftrace_clear_event_pids(tr); | |
1999 | ||
2000 | ret = ftrace_event_open(inode, file, seq_ops); | |
2001 | if (ret < 0) | |
2002 | trace_array_put(tr); | |
2003 | return ret; | |
2004 | } | |
2005 | ||
ae63b31e SR |
2006 | static struct event_subsystem * |
2007 | create_new_subsystem(const char *name) | |
2008 | { | |
2009 | struct event_subsystem *system; | |
2010 | ||
2011 | /* need to create new entry */ | |
2012 | system = kmalloc(sizeof(*system), GFP_KERNEL); | |
2013 | if (!system) | |
2014 | return NULL; | |
2015 | ||
2016 | system->ref_count = 1; | |
6e94a780 SR |
2017 | |
2018 | /* Only allocate if dynamic (kprobes and modules) */ | |
79ac6ef5 RV |
2019 | system->name = kstrdup_const(name, GFP_KERNEL); |
2020 | if (!system->name) | |
2021 | goto out_free; | |
ae63b31e SR |
2022 | |
2023 | system->filter = NULL; | |
2024 | ||
2025 | system->filter = kzalloc(sizeof(struct event_filter), GFP_KERNEL); | |
2026 | if (!system->filter) | |
2027 | goto out_free; | |
2028 | ||
2029 | list_add(&system->list, &event_subsystems); | |
2030 | ||
2031 | return system; | |
2032 | ||
2033 | out_free: | |
79ac6ef5 | 2034 | kfree_const(system->name); |
ae63b31e SR |
2035 | kfree(system); |
2036 | return NULL; | |
15075cac SR |
2037 | } |
2038 | ||
6ecc2d1c | 2039 | static struct dentry * |
ae63b31e | 2040 | event_subsystem_dir(struct trace_array *tr, const char *name, |
7f1d2f82 | 2041 | struct trace_event_file *file, struct dentry *parent) |
6ecc2d1c | 2042 | { |
7967b3e0 | 2043 | struct trace_subsystem_dir *dir; |
6ecc2d1c | 2044 | struct event_subsystem *system; |
e1112b4d | 2045 | struct dentry *entry; |
6ecc2d1c SR |
2046 | |
2047 | /* First see if we did not already create this dir */ | |
ae63b31e SR |
2048 | list_for_each_entry(dir, &tr->systems, list) { |
2049 | system = dir->subsystem; | |
dc82ec98 | 2050 | if (strcmp(system->name, name) == 0) { |
ae63b31e SR |
2051 | dir->nr_events++; |
2052 | file->system = dir; | |
2053 | return dir->entry; | |
dc82ec98 | 2054 | } |
6ecc2d1c SR |
2055 | } |
2056 | ||
ae63b31e SR |
2057 | /* Now see if the system itself exists. */ |
2058 | list_for_each_entry(system, &event_subsystems, list) { | |
2059 | if (strcmp(system->name, name) == 0) | |
2060 | break; | |
6ecc2d1c | 2061 | } |
ae63b31e SR |
2062 | /* Reset system variable when not found */ |
2063 | if (&system->list == &event_subsystems) | |
2064 | system = NULL; | |
6ecc2d1c | 2065 | |
ae63b31e SR |
2066 | dir = kmalloc(sizeof(*dir), GFP_KERNEL); |
2067 | if (!dir) | |
2068 | goto out_fail; | |
6ecc2d1c | 2069 | |
ae63b31e SR |
2070 | if (!system) { |
2071 | system = create_new_subsystem(name); | |
2072 | if (!system) | |
2073 | goto out_free; | |
2074 | } else | |
2075 | __get_system(system); | |
2076 | ||
8434dc93 | 2077 | dir->entry = tracefs_create_dir(name, parent); |
ae63b31e | 2078 | if (!dir->entry) { |
3448bac3 | 2079 | pr_warn("Failed to create system directory %s\n", name); |
ae63b31e SR |
2080 | __put_system(system); |
2081 | goto out_free; | |
6d723736 SR |
2082 | } |
2083 | ||
ae63b31e SR |
2084 | dir->tr = tr; |
2085 | dir->ref_count = 1; | |
2086 | dir->nr_events = 1; | |
2087 | dir->subsystem = system; | |
2088 | file->system = dir; | |
8b372562 | 2089 | |
8434dc93 | 2090 | entry = tracefs_create_file("filter", 0644, dir->entry, dir, |
e1112b4d | 2091 | &ftrace_subsystem_filter_fops); |
8b372562 TZ |
2092 | if (!entry) { |
2093 | kfree(system->filter); | |
2094 | system->filter = NULL; | |
8434dc93 | 2095 | pr_warn("Could not create tracefs '%s/filter' entry\n", name); |
8b372562 | 2096 | } |
e1112b4d | 2097 | |
ae63b31e | 2098 | trace_create_file("enable", 0644, dir->entry, dir, |
f3f3f009 | 2099 | &ftrace_system_enable_fops); |
8ae79a13 | 2100 | |
ae63b31e SR |
2101 | list_add(&dir->list, &tr->systems); |
2102 | ||
2103 | return dir->entry; | |
2104 | ||
2105 | out_free: | |
2106 | kfree(dir); | |
2107 | out_fail: | |
2108 | /* Only print this message if failed on memory allocation */ | |
2109 | if (!dir || !system) | |
3448bac3 | 2110 | pr_warn("No memory to create event subsystem %s\n", name); |
ae63b31e | 2111 | return NULL; |
6ecc2d1c SR |
2112 | } |
2113 | ||
1473e441 | 2114 | static int |
7f1d2f82 | 2115 | event_create_dir(struct dentry *parent, struct trace_event_file *file) |
1473e441 | 2116 | { |
2425bcb9 | 2117 | struct trace_event_call *call = file->event_call; |
ae63b31e | 2118 | struct trace_array *tr = file->tr; |
2e33af02 | 2119 | struct list_head *head; |
ae63b31e | 2120 | struct dentry *d_events; |
de7b2973 | 2121 | const char *name; |
fd994989 | 2122 | int ret; |
1473e441 | 2123 | |
6ecc2d1c SR |
2124 | /* |
2125 | * If the trace point header did not define TRACE_SYSTEM | |
2126 | * then the system would be called "TRACE_SYSTEM". | |
2127 | */ | |
ae63b31e SR |
2128 | if (strcmp(call->class->system, TRACE_SYSTEM) != 0) { |
2129 | d_events = event_subsystem_dir(tr, call->class->system, file, parent); | |
2130 | if (!d_events) | |
2131 | return -ENOMEM; | |
2132 | } else | |
2133 | d_events = parent; | |
2134 | ||
687fcc4a | 2135 | name = trace_event_name(call); |
8434dc93 | 2136 | file->dir = tracefs_create_dir(name, d_events); |
ae63b31e | 2137 | if (!file->dir) { |
8434dc93 | 2138 | pr_warn("Could not create tracefs '%s' directory\n", name); |
1473e441 SR |
2139 | return -1; |
2140 | } | |
2141 | ||
9b63776f | 2142 | if (call->class->reg && !(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) |
ae63b31e | 2143 | trace_create_file("enable", 0644, file->dir, file, |
620a30e9 | 2144 | &ftrace_enable_fops); |
1473e441 | 2145 | |
2239291a | 2146 | #ifdef CONFIG_PERF_EVENTS |
a1d0ce82 | 2147 | if (call->event.type && call->class->reg) |
1a11126b | 2148 | trace_create_file("id", 0444, file->dir, |
620a30e9 ON |
2149 | (void *)(long)call->event.type, |
2150 | &ftrace_event_id_fops); | |
2239291a | 2151 | #endif |
23725aee | 2152 | |
c9d932cf LZ |
2153 | /* |
2154 | * Other events may have the same class. Only update | |
2155 | * the fields if they are not already defined. | |
2156 | */ | |
2157 | head = trace_get_fields(call); | |
2158 | if (list_empty(head)) { | |
2159 | ret = call->class->define_fields(call); | |
2160 | if (ret < 0) { | |
3448bac3 FF |
2161 | pr_warn("Could not initialize trace point events/%s\n", |
2162 | name); | |
ae63b31e | 2163 | return -1; |
cf027f64 TZ |
2164 | } |
2165 | } | |
f306cc82 | 2166 | trace_create_file("filter", 0644, file->dir, file, |
620a30e9 | 2167 | &ftrace_event_filter_fops); |
cf027f64 | 2168 | |
854145e0 CH |
2169 | /* |
2170 | * Only event directories that can be enabled should have | |
2171 | * triggers. | |
2172 | */ | |
2173 | if (!(call->flags & TRACE_EVENT_FL_IGNORE_ENABLE)) | |
2174 | trace_create_file("trigger", 0644, file->dir, file, | |
2175 | &event_trigger_fops); | |
85f2b082 | 2176 | |
7ef224d1 TZ |
2177 | #ifdef CONFIG_HIST_TRIGGERS |
2178 | trace_create_file("hist", 0444, file->dir, file, | |
2179 | &event_hist_fops); | |
2180 | #endif | |
ae63b31e | 2181 | trace_create_file("format", 0444, file->dir, call, |
620a30e9 | 2182 | &ftrace_event_format_fops); |
6d723736 SR |
2183 | |
2184 | return 0; | |
2185 | } | |
2186 | ||
2425bcb9 | 2187 | static void remove_event_from_tracers(struct trace_event_call *call) |
ae63b31e | 2188 | { |
7f1d2f82 | 2189 | struct trace_event_file *file; |
ae63b31e SR |
2190 | struct trace_array *tr; |
2191 | ||
2192 | do_for_each_event_file_safe(tr, file) { | |
ae63b31e SR |
2193 | if (file->event_call != call) |
2194 | continue; | |
2195 | ||
f6a84bdc | 2196 | remove_event_file_dir(file); |
ae63b31e SR |
2197 | /* |
2198 | * The do_for_each_event_file_safe() is | |
2199 | * a double loop. After finding the call for this | |
2200 | * trace_array, we use break to jump to the next | |
2201 | * trace_array. | |
2202 | */ | |
2203 | break; | |
2204 | } while_for_each_event_file(); | |
2205 | } | |
2206 | ||
2425bcb9 | 2207 | static void event_remove(struct trace_event_call *call) |
8781915a | 2208 | { |
ae63b31e | 2209 | struct trace_array *tr; |
7f1d2f82 | 2210 | struct trace_event_file *file; |
ae63b31e SR |
2211 | |
2212 | do_for_each_event_file(tr, file) { | |
2213 | if (file->event_call != call) | |
2214 | continue; | |
2215 | ftrace_event_enable_disable(file, 0); | |
2216 | /* | |
2217 | * The do_for_each_event_file() is | |
2218 | * a double loop. After finding the call for this | |
2219 | * trace_array, we use break to jump to the next | |
2220 | * trace_array. | |
2221 | */ | |
2222 | break; | |
2223 | } while_for_each_event_file(); | |
2224 | ||
8781915a | 2225 | if (call->event.funcs) |
9023c930 | 2226 | __unregister_trace_event(&call->event); |
ae63b31e | 2227 | remove_event_from_tracers(call); |
8781915a EG |
2228 | list_del(&call->list); |
2229 | } | |
2230 | ||
2425bcb9 | 2231 | static int event_init(struct trace_event_call *call) |
8781915a EG |
2232 | { |
2233 | int ret = 0; | |
de7b2973 | 2234 | const char *name; |
8781915a | 2235 | |
687fcc4a | 2236 | name = trace_event_name(call); |
de7b2973 | 2237 | if (WARN_ON(!name)) |
8781915a EG |
2238 | return -EINVAL; |
2239 | ||
2240 | if (call->class->raw_init) { | |
2241 | ret = call->class->raw_init(call); | |
2242 | if (ret < 0 && ret != -ENOSYS) | |
3448bac3 | 2243 | pr_warn("Could not initialize trace events/%s\n", name); |
8781915a EG |
2244 | } |
2245 | ||
2246 | return ret; | |
2247 | } | |
2248 | ||
67ead0a6 | 2249 | static int |
2425bcb9 | 2250 | __register_event(struct trace_event_call *call, struct module *mod) |
bd1a5c84 | 2251 | { |
bd1a5c84 | 2252 | int ret; |
6d723736 | 2253 | |
8781915a EG |
2254 | ret = event_init(call); |
2255 | if (ret < 0) | |
2256 | return ret; | |
701970b3 | 2257 | |
ae63b31e | 2258 | list_add(&call->list, &ftrace_events); |
67ead0a6 | 2259 | call->mod = mod; |
88f70d75 | 2260 | |
ae63b31e | 2261 | return 0; |
bd1a5c84 MH |
2262 | } |
2263 | ||
0c564a53 SRRH |
2264 | static char *enum_replace(char *ptr, struct trace_enum_map *map, int len) |
2265 | { | |
2266 | int rlen; | |
2267 | int elen; | |
2268 | ||
2269 | /* Find the length of the enum value as a string */ | |
2270 | elen = snprintf(ptr, 0, "%ld", map->enum_value); | |
2271 | /* Make sure there's enough room to replace the string with the value */ | |
2272 | if (len < elen) | |
2273 | return NULL; | |
2274 | ||
2275 | snprintf(ptr, elen + 1, "%ld", map->enum_value); | |
2276 | ||
2277 | /* Get the rest of the string of ptr */ | |
2278 | rlen = strlen(ptr + len); | |
2279 | memmove(ptr + elen, ptr + len, rlen); | |
2280 | /* Make sure we end the new string */ | |
2281 | ptr[elen + rlen] = 0; | |
2282 | ||
2283 | return ptr + elen; | |
2284 | } | |
2285 | ||
2425bcb9 | 2286 | static void update_event_printk(struct trace_event_call *call, |
0c564a53 SRRH |
2287 | struct trace_enum_map *map) |
2288 | { | |
2289 | char *ptr; | |
2290 | int quote = 0; | |
2291 | int len = strlen(map->enum_string); | |
2292 | ||
2293 | for (ptr = call->print_fmt; *ptr; ptr++) { | |
2294 | if (*ptr == '\\') { | |
2295 | ptr++; | |
2296 | /* paranoid */ | |
2297 | if (!*ptr) | |
2298 | break; | |
2299 | continue; | |
2300 | } | |
2301 | if (*ptr == '"') { | |
2302 | quote ^= 1; | |
2303 | continue; | |
2304 | } | |
2305 | if (quote) | |
2306 | continue; | |
2307 | if (isdigit(*ptr)) { | |
2308 | /* skip numbers */ | |
2309 | do { | |
2310 | ptr++; | |
2311 | /* Check for alpha chars like ULL */ | |
2312 | } while (isalnum(*ptr)); | |
3193899d SRRH |
2313 | if (!*ptr) |
2314 | break; | |
0c564a53 SRRH |
2315 | /* |
2316 | * A number must have some kind of delimiter after | |
2317 | * it, and we can ignore that too. | |
2318 | */ | |
2319 | continue; | |
2320 | } | |
2321 | if (isalpha(*ptr) || *ptr == '_') { | |
2322 | if (strncmp(map->enum_string, ptr, len) == 0 && | |
2323 | !isalnum(ptr[len]) && ptr[len] != '_') { | |
2324 | ptr = enum_replace(ptr, map, len); | |
2325 | /* Hmm, enum string smaller than value */ | |
2326 | if (WARN_ON_ONCE(!ptr)) | |
2327 | return; | |
2328 | /* | |
2329 | * No need to decrement here, as enum_replace() | |
2330 | * returns the pointer to the character passed | |
2331 | * the enum, and two enums can not be placed | |
2332 | * back to back without something in between. | |
2333 | * We can skip that something in between. | |
2334 | */ | |
2335 | continue; | |
2336 | } | |
2337 | skip_more: | |
2338 | do { | |
2339 | ptr++; | |
2340 | } while (isalnum(*ptr) || *ptr == '_'); | |
3193899d SRRH |
2341 | if (!*ptr) |
2342 | break; | |
0c564a53 SRRH |
2343 | /* |
2344 | * If what comes after this variable is a '.' or | |
2345 | * '->' then we can continue to ignore that string. | |
2346 | */ | |
2347 | if (*ptr == '.' || (ptr[0] == '-' && ptr[1] == '>')) { | |
2348 | ptr += *ptr == '.' ? 1 : 2; | |
3193899d SRRH |
2349 | if (!*ptr) |
2350 | break; | |
0c564a53 SRRH |
2351 | goto skip_more; |
2352 | } | |
2353 | /* | |
2354 | * Once again, we can skip the delimiter that came | |
2355 | * after the string. | |
2356 | */ | |
2357 | continue; | |
2358 | } | |
2359 | } | |
2360 | } | |
2361 | ||
2362 | void trace_event_enum_update(struct trace_enum_map **map, int len) | |
2363 | { | |
2425bcb9 | 2364 | struct trace_event_call *call, *p; |
0c564a53 SRRH |
2365 | const char *last_system = NULL; |
2366 | int last_i; | |
2367 | int i; | |
2368 | ||
2369 | down_write(&trace_event_sem); | |
2370 | list_for_each_entry_safe(call, p, &ftrace_events, list) { | |
2371 | /* events are usually grouped together with systems */ | |
2372 | if (!last_system || call->class->system != last_system) { | |
2373 | last_i = 0; | |
2374 | last_system = call->class->system; | |
2375 | } | |
2376 | ||
2377 | for (i = last_i; i < len; i++) { | |
2378 | if (call->class->system == map[i]->system) { | |
2379 | /* Save the first system if need be */ | |
2380 | if (!last_i) | |
2381 | last_i = i; | |
2382 | update_event_printk(call, map[i]); | |
2383 | } | |
2384 | } | |
2385 | } | |
2386 | up_write(&trace_event_sem); | |
2387 | } | |
2388 | ||
7f1d2f82 | 2389 | static struct trace_event_file * |
2425bcb9 | 2390 | trace_create_new_event(struct trace_event_call *call, |
da511bf3 SRRH |
2391 | struct trace_array *tr) |
2392 | { | |
7f1d2f82 | 2393 | struct trace_event_file *file; |
da511bf3 SRRH |
2394 | |
2395 | file = kmem_cache_alloc(file_cachep, GFP_TRACE); | |
2396 | if (!file) | |
2397 | return NULL; | |
2398 | ||
2399 | file->event_call = call; | |
2400 | file->tr = tr; | |
2401 | atomic_set(&file->sm_ref, 0); | |
85f2b082 TZ |
2402 | atomic_set(&file->tm_ref, 0); |
2403 | INIT_LIST_HEAD(&file->triggers); | |
da511bf3 SRRH |
2404 | list_add(&file->list, &tr->events); |
2405 | ||
2406 | return file; | |
2407 | } | |
2408 | ||
ae63b31e SR |
2409 | /* Add an event to a trace directory */ |
2410 | static int | |
2425bcb9 | 2411 | __trace_add_new_event(struct trace_event_call *call, struct trace_array *tr) |
ae63b31e | 2412 | { |
7f1d2f82 | 2413 | struct trace_event_file *file; |
ae63b31e | 2414 | |
da511bf3 | 2415 | file = trace_create_new_event(call, tr); |
ae63b31e SR |
2416 | if (!file) |
2417 | return -ENOMEM; | |
2418 | ||
620a30e9 | 2419 | return event_create_dir(tr->event_dir, file); |
ae63b31e SR |
2420 | } |
2421 | ||
77248221 SR |
2422 | /* |
2423 | * Just create a decriptor for early init. A descriptor is required | |
2424 | * for enabling events at boot. We want to enable events before | |
2425 | * the filesystem is initialized. | |
2426 | */ | |
2427 | static __init int | |
2425bcb9 | 2428 | __trace_early_add_new_event(struct trace_event_call *call, |
77248221 SR |
2429 | struct trace_array *tr) |
2430 | { | |
7f1d2f82 | 2431 | struct trace_event_file *file; |
77248221 | 2432 | |
da511bf3 | 2433 | file = trace_create_new_event(call, tr); |
77248221 SR |
2434 | if (!file) |
2435 | return -ENOMEM; | |
2436 | ||
77248221 SR |
2437 | return 0; |
2438 | } | |
2439 | ||
ae63b31e | 2440 | struct ftrace_module_file_ops; |
2425bcb9 | 2441 | static void __add_event_to_tracers(struct trace_event_call *call); |
ae63b31e | 2442 | |
bd1a5c84 | 2443 | /* Add an additional event_call dynamically */ |
2425bcb9 | 2444 | int trace_add_event_call(struct trace_event_call *call) |
bd1a5c84 MH |
2445 | { |
2446 | int ret; | |
a8227415 | 2447 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 2448 | mutex_lock(&event_mutex); |
701970b3 | 2449 | |
ae63b31e SR |
2450 | ret = __register_event(call, NULL); |
2451 | if (ret >= 0) | |
779c5e37 | 2452 | __add_event_to_tracers(call); |
a2ca5e03 | 2453 | |
ae63b31e | 2454 | mutex_unlock(&event_mutex); |
a8227415 | 2455 | mutex_unlock(&trace_types_lock); |
ae63b31e | 2456 | return ret; |
a2ca5e03 FW |
2457 | } |
2458 | ||
4fead8e4 | 2459 | /* |
a8227415 AL |
2460 | * Must be called under locking of trace_types_lock, event_mutex and |
2461 | * trace_event_sem. | |
4fead8e4 | 2462 | */ |
2425bcb9 | 2463 | static void __trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2464 | { |
8781915a | 2465 | event_remove(call); |
bd1a5c84 | 2466 | trace_destroy_fields(call); |
57375747 ON |
2467 | free_event_filter(call->filter); |
2468 | call->filter = NULL; | |
bd1a5c84 MH |
2469 | } |
2470 | ||
2425bcb9 | 2471 | static int probe_remove_event_call(struct trace_event_call *call) |
2816c551 ON |
2472 | { |
2473 | struct trace_array *tr; | |
7f1d2f82 | 2474 | struct trace_event_file *file; |
2816c551 ON |
2475 | |
2476 | #ifdef CONFIG_PERF_EVENTS | |
2477 | if (call->perf_refcount) | |
2478 | return -EBUSY; | |
2479 | #endif | |
2480 | do_for_each_event_file(tr, file) { | |
2481 | if (file->event_call != call) | |
2482 | continue; | |
2483 | /* | |
2484 | * We can't rely on ftrace_event_enable_disable(enable => 0) | |
5d6ad960 | 2485 | * we are going to do, EVENT_FILE_FL_SOFT_MODE can suppress |
2816c551 ON |
2486 | * TRACE_REG_UNREGISTER. |
2487 | */ | |
5d6ad960 | 2488 | if (file->flags & EVENT_FILE_FL_ENABLED) |
2816c551 | 2489 | return -EBUSY; |
2ba64035 SRRH |
2490 | /* |
2491 | * The do_for_each_event_file_safe() is | |
2492 | * a double loop. After finding the call for this | |
2493 | * trace_array, we use break to jump to the next | |
2494 | * trace_array. | |
2495 | */ | |
2816c551 ON |
2496 | break; |
2497 | } while_for_each_event_file(); | |
2498 | ||
2499 | __trace_remove_event_call(call); | |
2500 | ||
2501 | return 0; | |
2502 | } | |
2503 | ||
bd1a5c84 | 2504 | /* Remove an event_call */ |
2425bcb9 | 2505 | int trace_remove_event_call(struct trace_event_call *call) |
bd1a5c84 | 2506 | { |
2816c551 ON |
2507 | int ret; |
2508 | ||
a8227415 | 2509 | mutex_lock(&trace_types_lock); |
bd1a5c84 | 2510 | mutex_lock(&event_mutex); |
52f6ad6d | 2511 | down_write(&trace_event_sem); |
2816c551 | 2512 | ret = probe_remove_event_call(call); |
52f6ad6d | 2513 | up_write(&trace_event_sem); |
bd1a5c84 | 2514 | mutex_unlock(&event_mutex); |
a8227415 | 2515 | mutex_unlock(&trace_types_lock); |
2816c551 ON |
2516 | |
2517 | return ret; | |
bd1a5c84 MH |
2518 | } |
2519 | ||
2520 | #define for_each_event(event, start, end) \ | |
2521 | for (event = start; \ | |
2522 | (unsigned long)event < (unsigned long)end; \ | |
2523 | event++) | |
2524 | ||
2525 | #ifdef CONFIG_MODULES | |
2526 | ||
6d723736 SR |
2527 | static void trace_module_add_events(struct module *mod) |
2528 | { | |
2425bcb9 | 2529 | struct trace_event_call **call, **start, **end; |
6d723736 | 2530 | |
45ab2813 SRRH |
2531 | if (!mod->num_trace_events) |
2532 | return; | |
2533 | ||
2534 | /* Don't add infrastructure for mods without tracepoints */ | |
2535 | if (trace_module_has_bad_taint(mod)) { | |
2536 | pr_err("%s: module has bad taint, not creating trace events\n", | |
2537 | mod->name); | |
2538 | return; | |
2539 | } | |
2540 | ||
6d723736 SR |
2541 | start = mod->trace_events; |
2542 | end = mod->trace_events + mod->num_trace_events; | |
2543 | ||
6d723736 | 2544 | for_each_event(call, start, end) { |
ae63b31e | 2545 | __register_event(*call, mod); |
779c5e37 | 2546 | __add_event_to_tracers(*call); |
6d723736 SR |
2547 | } |
2548 | } | |
2549 | ||
2550 | static void trace_module_remove_events(struct module *mod) | |
2551 | { | |
2425bcb9 | 2552 | struct trace_event_call *call, *p; |
575380da | 2553 | bool clear_trace = false; |
6d723736 | 2554 | |
52f6ad6d | 2555 | down_write(&trace_event_sem); |
6d723736 SR |
2556 | list_for_each_entry_safe(call, p, &ftrace_events, list) { |
2557 | if (call->mod == mod) { | |
575380da SRRH |
2558 | if (call->flags & TRACE_EVENT_FL_WAS_ENABLED) |
2559 | clear_trace = true; | |
bd1a5c84 | 2560 | __trace_remove_event_call(call); |
6d723736 SR |
2561 | } |
2562 | } | |
52f6ad6d | 2563 | up_write(&trace_event_sem); |
9456f0fa SR |
2564 | |
2565 | /* | |
2566 | * It is safest to reset the ring buffer if the module being unloaded | |
873c642f SRRH |
2567 | * registered any events that were used. The only worry is if |
2568 | * a new module gets loaded, and takes on the same id as the events | |
2569 | * of this module. When printing out the buffer, traced events left | |
2570 | * over from this module may be passed to the new module events and | |
2571 | * unexpected results may occur. | |
9456f0fa | 2572 | */ |
575380da | 2573 | if (clear_trace) |
873c642f | 2574 | tracing_reset_all_online_cpus(); |
6d723736 SR |
2575 | } |
2576 | ||
61f919a1 SR |
2577 | static int trace_module_notify(struct notifier_block *self, |
2578 | unsigned long val, void *data) | |
6d723736 SR |
2579 | { |
2580 | struct module *mod = data; | |
2581 | ||
a8227415 | 2582 | mutex_lock(&trace_types_lock); |
6d723736 SR |
2583 | mutex_lock(&event_mutex); |
2584 | switch (val) { | |
2585 | case MODULE_STATE_COMING: | |
2586 | trace_module_add_events(mod); | |
2587 | break; | |
2588 | case MODULE_STATE_GOING: | |
2589 | trace_module_remove_events(mod); | |
2590 | break; | |
2591 | } | |
2592 | mutex_unlock(&event_mutex); | |
a8227415 | 2593 | mutex_unlock(&trace_types_lock); |
fd994989 | 2594 | |
1473e441 SR |
2595 | return 0; |
2596 | } | |
315326c1 | 2597 | |
836d481e ON |
2598 | static struct notifier_block trace_module_nb = { |
2599 | .notifier_call = trace_module_notify, | |
3673b8e4 | 2600 | .priority = 1, /* higher than trace.c module notify */ |
836d481e | 2601 | }; |
61f919a1 | 2602 | #endif /* CONFIG_MODULES */ |
1473e441 | 2603 | |
ae63b31e SR |
2604 | /* Create a new event directory structure for a trace directory. */ |
2605 | static void | |
2606 | __trace_add_event_dirs(struct trace_array *tr) | |
2607 | { | |
2425bcb9 | 2608 | struct trace_event_call *call; |
ae63b31e SR |
2609 | int ret; |
2610 | ||
2611 | list_for_each_entry(call, &ftrace_events, list) { | |
620a30e9 | 2612 | ret = __trace_add_new_event(call, tr); |
ae63b31e | 2613 | if (ret < 0) |
3448bac3 | 2614 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2615 | trace_event_name(call)); |
ae63b31e SR |
2616 | } |
2617 | } | |
2618 | ||
7f1d2f82 | 2619 | struct trace_event_file * |
3cd715de SRRH |
2620 | find_event_file(struct trace_array *tr, const char *system, const char *event) |
2621 | { | |
7f1d2f82 | 2622 | struct trace_event_file *file; |
2425bcb9 | 2623 | struct trace_event_call *call; |
de7b2973 | 2624 | const char *name; |
3cd715de SRRH |
2625 | |
2626 | list_for_each_entry(file, &tr->events, list) { | |
2627 | ||
2628 | call = file->event_call; | |
687fcc4a | 2629 | name = trace_event_name(call); |
3cd715de | 2630 | |
de7b2973 | 2631 | if (!name || !call->class || !call->class->reg) |
3cd715de SRRH |
2632 | continue; |
2633 | ||
2634 | if (call->flags & TRACE_EVENT_FL_IGNORE_ENABLE) | |
2635 | continue; | |
2636 | ||
de7b2973 | 2637 | if (strcmp(event, name) == 0 && |
3cd715de SRRH |
2638 | strcmp(system, call->class->system) == 0) |
2639 | return file; | |
2640 | } | |
2641 | return NULL; | |
2642 | } | |
2643 | ||
2875a08b SRRH |
2644 | #ifdef CONFIG_DYNAMIC_FTRACE |
2645 | ||
2646 | /* Avoid typos */ | |
2647 | #define ENABLE_EVENT_STR "enable_event" | |
2648 | #define DISABLE_EVENT_STR "disable_event" | |
2649 | ||
2650 | struct event_probe_data { | |
7f1d2f82 | 2651 | struct trace_event_file *file; |
2875a08b SRRH |
2652 | unsigned long count; |
2653 | int ref; | |
2654 | bool enable; | |
2655 | }; | |
2656 | ||
3cd715de SRRH |
2657 | static void |
2658 | event_enable_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2659 | { | |
2660 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2661 | struct event_probe_data *data = *pdata; | |
2662 | ||
2663 | if (!data) | |
2664 | return; | |
2665 | ||
2666 | if (data->enable) | |
5d6ad960 | 2667 | clear_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
3cd715de | 2668 | else |
5d6ad960 | 2669 | set_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT, &data->file->flags); |
3cd715de SRRH |
2670 | } |
2671 | ||
2672 | static void | |
2673 | event_enable_count_probe(unsigned long ip, unsigned long parent_ip, void **_data) | |
2674 | { | |
2675 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2676 | struct event_probe_data *data = *pdata; | |
2677 | ||
2678 | if (!data) | |
2679 | return; | |
2680 | ||
2681 | if (!data->count) | |
2682 | return; | |
2683 | ||
2684 | /* Skip if the event is in a state we want to switch to */ | |
5d6ad960 | 2685 | if (data->enable == !(data->file->flags & EVENT_FILE_FL_SOFT_DISABLED)) |
3cd715de SRRH |
2686 | return; |
2687 | ||
2688 | if (data->count != -1) | |
2689 | (data->count)--; | |
2690 | ||
2691 | event_enable_probe(ip, parent_ip, _data); | |
2692 | } | |
2693 | ||
2694 | static int | |
2695 | event_enable_print(struct seq_file *m, unsigned long ip, | |
2696 | struct ftrace_probe_ops *ops, void *_data) | |
2697 | { | |
2698 | struct event_probe_data *data = _data; | |
2699 | ||
2700 | seq_printf(m, "%ps:", (void *)ip); | |
2701 | ||
2702 | seq_printf(m, "%s:%s:%s", | |
2703 | data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR, | |
2704 | data->file->event_call->class->system, | |
687fcc4a | 2705 | trace_event_name(data->file->event_call)); |
3cd715de SRRH |
2706 | |
2707 | if (data->count == -1) | |
fa6f0cc7 | 2708 | seq_puts(m, ":unlimited\n"); |
3cd715de SRRH |
2709 | else |
2710 | seq_printf(m, ":count=%ld\n", data->count); | |
2711 | ||
2712 | return 0; | |
2713 | } | |
2714 | ||
2715 | static int | |
2716 | event_enable_init(struct ftrace_probe_ops *ops, unsigned long ip, | |
2717 | void **_data) | |
2718 | { | |
2719 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2720 | struct event_probe_data *data = *pdata; | |
2721 | ||
2722 | data->ref++; | |
2723 | return 0; | |
2724 | } | |
2725 | ||
2726 | static void | |
2727 | event_enable_free(struct ftrace_probe_ops *ops, unsigned long ip, | |
2728 | void **_data) | |
2729 | { | |
2730 | struct event_probe_data **pdata = (struct event_probe_data **)_data; | |
2731 | struct event_probe_data *data = *pdata; | |
2732 | ||
2733 | if (WARN_ON_ONCE(data->ref <= 0)) | |
2734 | return; | |
2735 | ||
2736 | data->ref--; | |
2737 | if (!data->ref) { | |
2738 | /* Remove the SOFT_MODE flag */ | |
2739 | __ftrace_event_enable_disable(data->file, 0, 1); | |
2740 | module_put(data->file->event_call->mod); | |
2741 | kfree(data); | |
2742 | } | |
2743 | *pdata = NULL; | |
2744 | } | |
2745 | ||
2746 | static struct ftrace_probe_ops event_enable_probe_ops = { | |
2747 | .func = event_enable_probe, | |
2748 | .print = event_enable_print, | |
2749 | .init = event_enable_init, | |
2750 | .free = event_enable_free, | |
2751 | }; | |
2752 | ||
2753 | static struct ftrace_probe_ops event_enable_count_probe_ops = { | |
2754 | .func = event_enable_count_probe, | |
2755 | .print = event_enable_print, | |
2756 | .init = event_enable_init, | |
2757 | .free = event_enable_free, | |
2758 | }; | |
2759 | ||
2760 | static struct ftrace_probe_ops event_disable_probe_ops = { | |
2761 | .func = event_enable_probe, | |
2762 | .print = event_enable_print, | |
2763 | .init = event_enable_init, | |
2764 | .free = event_enable_free, | |
2765 | }; | |
2766 | ||
2767 | static struct ftrace_probe_ops event_disable_count_probe_ops = { | |
2768 | .func = event_enable_count_probe, | |
2769 | .print = event_enable_print, | |
2770 | .init = event_enable_init, | |
2771 | .free = event_enable_free, | |
2772 | }; | |
2773 | ||
2774 | static int | |
2775 | event_enable_func(struct ftrace_hash *hash, | |
2776 | char *glob, char *cmd, char *param, int enabled) | |
2777 | { | |
2778 | struct trace_array *tr = top_trace_array(); | |
7f1d2f82 | 2779 | struct trace_event_file *file; |
3cd715de SRRH |
2780 | struct ftrace_probe_ops *ops; |
2781 | struct event_probe_data *data; | |
2782 | const char *system; | |
2783 | const char *event; | |
2784 | char *number; | |
2785 | bool enable; | |
2786 | int ret; | |
2787 | ||
dc81e5e3 YY |
2788 | if (!tr) |
2789 | return -ENODEV; | |
2790 | ||
3cd715de | 2791 | /* hash funcs only work with set_ftrace_filter */ |
8092e808 | 2792 | if (!enabled || !param) |
3cd715de SRRH |
2793 | return -EINVAL; |
2794 | ||
2795 | system = strsep(¶m, ":"); | |
2796 | if (!param) | |
2797 | return -EINVAL; | |
2798 | ||
2799 | event = strsep(¶m, ":"); | |
2800 | ||
2801 | mutex_lock(&event_mutex); | |
2802 | ||
2803 | ret = -EINVAL; | |
2804 | file = find_event_file(tr, system, event); | |
2805 | if (!file) | |
2806 | goto out; | |
2807 | ||
2808 | enable = strcmp(cmd, ENABLE_EVENT_STR) == 0; | |
2809 | ||
2810 | if (enable) | |
2811 | ops = param ? &event_enable_count_probe_ops : &event_enable_probe_ops; | |
2812 | else | |
2813 | ops = param ? &event_disable_count_probe_ops : &event_disable_probe_ops; | |
2814 | ||
2815 | if (glob[0] == '!') { | |
2816 | unregister_ftrace_function_probe_func(glob+1, ops); | |
2817 | ret = 0; | |
2818 | goto out; | |
2819 | } | |
2820 | ||
2821 | ret = -ENOMEM; | |
2822 | data = kzalloc(sizeof(*data), GFP_KERNEL); | |
2823 | if (!data) | |
2824 | goto out; | |
2825 | ||
2826 | data->enable = enable; | |
2827 | data->count = -1; | |
2828 | data->file = file; | |
2829 | ||
2830 | if (!param) | |
2831 | goto out_reg; | |
2832 | ||
2833 | number = strsep(¶m, ":"); | |
2834 | ||
2835 | ret = -EINVAL; | |
2836 | if (!strlen(number)) | |
2837 | goto out_free; | |
2838 | ||
2839 | /* | |
2840 | * We use the callback data field (which is a pointer) | |
2841 | * as our counter. | |
2842 | */ | |
2843 | ret = kstrtoul(number, 0, &data->count); | |
2844 | if (ret) | |
2845 | goto out_free; | |
2846 | ||
2847 | out_reg: | |
2848 | /* Don't let event modules unload while probe registered */ | |
2849 | ret = try_module_get(file->event_call->mod); | |
6ed01066 MH |
2850 | if (!ret) { |
2851 | ret = -EBUSY; | |
3cd715de | 2852 | goto out_free; |
6ed01066 | 2853 | } |
3cd715de SRRH |
2854 | |
2855 | ret = __ftrace_event_enable_disable(file, 1, 1); | |
2856 | if (ret < 0) | |
2857 | goto out_put; | |
2858 | ret = register_ftrace_function_probe(glob, ops, data); | |
ff305ded SRRH |
2859 | /* |
2860 | * The above returns on success the # of functions enabled, | |
2861 | * but if it didn't find any functions it returns zero. | |
2862 | * Consider no functions a failure too. | |
2863 | */ | |
a5b85bd1 MH |
2864 | if (!ret) { |
2865 | ret = -ENOENT; | |
3cd715de | 2866 | goto out_disable; |
ff305ded SRRH |
2867 | } else if (ret < 0) |
2868 | goto out_disable; | |
2869 | /* Just return zero, not the number of enabled functions */ | |
2870 | ret = 0; | |
3cd715de SRRH |
2871 | out: |
2872 | mutex_unlock(&event_mutex); | |
2873 | return ret; | |
2874 | ||
2875 | out_disable: | |
2876 | __ftrace_event_enable_disable(file, 0, 1); | |
2877 | out_put: | |
2878 | module_put(file->event_call->mod); | |
2879 | out_free: | |
2880 | kfree(data); | |
2881 | goto out; | |
2882 | } | |
2883 | ||
2884 | static struct ftrace_func_command event_enable_cmd = { | |
2885 | .name = ENABLE_EVENT_STR, | |
2886 | .func = event_enable_func, | |
2887 | }; | |
2888 | ||
2889 | static struct ftrace_func_command event_disable_cmd = { | |
2890 | .name = DISABLE_EVENT_STR, | |
2891 | .func = event_enable_func, | |
2892 | }; | |
2893 | ||
2894 | static __init int register_event_cmds(void) | |
2895 | { | |
2896 | int ret; | |
2897 | ||
2898 | ret = register_ftrace_command(&event_enable_cmd); | |
2899 | if (WARN_ON(ret < 0)) | |
2900 | return ret; | |
2901 | ret = register_ftrace_command(&event_disable_cmd); | |
2902 | if (WARN_ON(ret < 0)) | |
2903 | unregister_ftrace_command(&event_enable_cmd); | |
2904 | return ret; | |
2905 | } | |
2906 | #else | |
2907 | static inline int register_event_cmds(void) { return 0; } | |
2908 | #endif /* CONFIG_DYNAMIC_FTRACE */ | |
2909 | ||
77248221 | 2910 | /* |
7f1d2f82 | 2911 | * The top level array has already had its trace_event_file |
77248221 | 2912 | * descriptors created in order to allow for early events to |
8434dc93 | 2913 | * be recorded. This function is called after the tracefs has been |
77248221 SR |
2914 | * initialized, and we now have to create the files associated |
2915 | * to the events. | |
2916 | */ | |
2917 | static __init void | |
2918 | __trace_early_add_event_dirs(struct trace_array *tr) | |
2919 | { | |
7f1d2f82 | 2920 | struct trace_event_file *file; |
77248221 SR |
2921 | int ret; |
2922 | ||
2923 | ||
2924 | list_for_each_entry(file, &tr->events, list) { | |
620a30e9 | 2925 | ret = event_create_dir(tr->event_dir, file); |
77248221 | 2926 | if (ret < 0) |
3448bac3 | 2927 | pr_warn("Could not create directory for event %s\n", |
687fcc4a | 2928 | trace_event_name(file->event_call)); |
77248221 SR |
2929 | } |
2930 | } | |
2931 | ||
2932 | /* | |
2933 | * For early boot up, the top trace array requires to have | |
2934 | * a list of events that can be enabled. This must be done before | |
2935 | * the filesystem is set up in order to allow events to be traced | |
2936 | * early. | |
2937 | */ | |
2938 | static __init void | |
2939 | __trace_early_add_events(struct trace_array *tr) | |
2940 | { | |
2425bcb9 | 2941 | struct trace_event_call *call; |
77248221 SR |
2942 | int ret; |
2943 | ||
2944 | list_for_each_entry(call, &ftrace_events, list) { | |
2945 | /* Early boot up should not have any modules loaded */ | |
2946 | if (WARN_ON_ONCE(call->mod)) | |
2947 | continue; | |
2948 | ||
2949 | ret = __trace_early_add_new_event(call, tr); | |
2950 | if (ret < 0) | |
3448bac3 | 2951 | pr_warn("Could not create early event %s\n", |
687fcc4a | 2952 | trace_event_name(call)); |
77248221 SR |
2953 | } |
2954 | } | |
2955 | ||
0c8916c3 SR |
2956 | /* Remove the event directory structure for a trace directory. */ |
2957 | static void | |
2958 | __trace_remove_event_dirs(struct trace_array *tr) | |
2959 | { | |
7f1d2f82 | 2960 | struct trace_event_file *file, *next; |
0c8916c3 | 2961 | |
f6a84bdc ON |
2962 | list_for_each_entry_safe(file, next, &tr->events, list) |
2963 | remove_event_file_dir(file); | |
0c8916c3 SR |
2964 | } |
2965 | ||
2425bcb9 | 2966 | static void __add_event_to_tracers(struct trace_event_call *call) |
ae63b31e SR |
2967 | { |
2968 | struct trace_array *tr; | |
2969 | ||
620a30e9 ON |
2970 | list_for_each_entry(tr, &ftrace_trace_arrays, list) |
2971 | __trace_add_new_event(call, tr); | |
ae63b31e SR |
2972 | } |
2973 | ||
2425bcb9 SRRH |
2974 | extern struct trace_event_call *__start_ftrace_events[]; |
2975 | extern struct trace_event_call *__stop_ftrace_events[]; | |
a59fd602 | 2976 | |
020e5f85 LZ |
2977 | static char bootup_event_buf[COMMAND_LINE_SIZE] __initdata; |
2978 | ||
2979 | static __init int setup_trace_event(char *str) | |
2980 | { | |
2981 | strlcpy(bootup_event_buf, str, COMMAND_LINE_SIZE); | |
55034cd6 SRRH |
2982 | ring_buffer_expanded = true; |
2983 | tracing_selftest_disabled = true; | |
020e5f85 LZ |
2984 | |
2985 | return 1; | |
2986 | } | |
2987 | __setup("trace_event=", setup_trace_event); | |
2988 | ||
77248221 SR |
2989 | /* Expects to have event_mutex held when called */ |
2990 | static int | |
2991 | create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) | |
ae63b31e SR |
2992 | { |
2993 | struct dentry *d_events; | |
2994 | struct dentry *entry; | |
2995 | ||
8434dc93 | 2996 | entry = tracefs_create_file("set_event", 0644, parent, |
ae63b31e SR |
2997 | tr, &ftrace_set_event_fops); |
2998 | if (!entry) { | |
8434dc93 | 2999 | pr_warn("Could not create tracefs 'set_event' entry\n"); |
ae63b31e SR |
3000 | return -ENOMEM; |
3001 | } | |
3002 | ||
8434dc93 | 3003 | d_events = tracefs_create_dir("events", parent); |
277ba044 | 3004 | if (!d_events) { |
8434dc93 | 3005 | pr_warn("Could not create tracefs 'events' directory\n"); |
277ba044 SR |
3006 | return -ENOMEM; |
3007 | } | |
ae63b31e | 3008 | |
49090107 SRRH |
3009 | entry = tracefs_create_file("set_event_pid", 0644, parent, |
3010 | tr, &ftrace_set_event_pid_fops); | |
3011 | ||
ae63b31e SR |
3012 | /* ring buffer internal formats */ |
3013 | trace_create_file("header_page", 0444, d_events, | |
3014 | ring_buffer_print_page_header, | |
3015 | &ftrace_show_header_fops); | |
3016 | ||
3017 | trace_create_file("header_event", 0444, d_events, | |
3018 | ring_buffer_print_entry_header, | |
3019 | &ftrace_show_header_fops); | |
3020 | ||
3021 | trace_create_file("enable", 0644, d_events, | |
3022 | tr, &ftrace_tr_enable_fops); | |
3023 | ||
3024 | tr->event_dir = d_events; | |
77248221 SR |
3025 | |
3026 | return 0; | |
3027 | } | |
3028 | ||
3029 | /** | |
3030 | * event_trace_add_tracer - add a instance of a trace_array to events | |
3031 | * @parent: The parent dentry to place the files/directories for events in | |
3032 | * @tr: The trace array associated with these events | |
3033 | * | |
3034 | * When a new instance is created, it needs to set up its events | |
3035 | * directory, as well as other files associated with events. It also | |
3036 | * creates the event hierachry in the @parent/events directory. | |
3037 | * | |
3038 | * Returns 0 on success. | |
3039 | */ | |
3040 | int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr) | |
3041 | { | |
3042 | int ret; | |
3043 | ||
3044 | mutex_lock(&event_mutex); | |
3045 | ||
3046 | ret = create_event_toplevel_files(parent, tr); | |
3047 | if (ret) | |
3048 | goto out_unlock; | |
3049 | ||
52f6ad6d | 3050 | down_write(&trace_event_sem); |
ae63b31e | 3051 | __trace_add_event_dirs(tr); |
52f6ad6d | 3052 | up_write(&trace_event_sem); |
277ba044 | 3053 | |
77248221 | 3054 | out_unlock: |
277ba044 | 3055 | mutex_unlock(&event_mutex); |
ae63b31e | 3056 | |
77248221 SR |
3057 | return ret; |
3058 | } | |
3059 | ||
3060 | /* | |
3061 | * The top trace array already had its file descriptors created. | |
3062 | * Now the files themselves need to be created. | |
3063 | */ | |
3064 | static __init int | |
3065 | early_event_add_tracer(struct dentry *parent, struct trace_array *tr) | |
3066 | { | |
3067 | int ret; | |
3068 | ||
3069 | mutex_lock(&event_mutex); | |
3070 | ||
3071 | ret = create_event_toplevel_files(parent, tr); | |
3072 | if (ret) | |
3073 | goto out_unlock; | |
3074 | ||
52f6ad6d | 3075 | down_write(&trace_event_sem); |
77248221 | 3076 | __trace_early_add_event_dirs(tr); |
52f6ad6d | 3077 | up_write(&trace_event_sem); |
77248221 SR |
3078 | |
3079 | out_unlock: | |
3080 | mutex_unlock(&event_mutex); | |
3081 | ||
3082 | return ret; | |
ae63b31e SR |
3083 | } |
3084 | ||
0c8916c3 SR |
3085 | int event_trace_del_tracer(struct trace_array *tr) |
3086 | { | |
0c8916c3 SR |
3087 | mutex_lock(&event_mutex); |
3088 | ||
85f2b082 TZ |
3089 | /* Disable any event triggers and associated soft-disabled events */ |
3090 | clear_event_triggers(tr); | |
3091 | ||
49090107 SRRH |
3092 | /* Clear the pid list */ |
3093 | __ftrace_clear_event_pids(tr); | |
3094 | ||
2a6c24af SRRH |
3095 | /* Disable any running events */ |
3096 | __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0); | |
3097 | ||
3ccb0123 SR |
3098 | /* Access to events are within rcu_read_lock_sched() */ |
3099 | synchronize_sched(); | |
3100 | ||
52f6ad6d | 3101 | down_write(&trace_event_sem); |
0c8916c3 | 3102 | __trace_remove_event_dirs(tr); |
8434dc93 | 3103 | tracefs_remove_recursive(tr->event_dir); |
52f6ad6d | 3104 | up_write(&trace_event_sem); |
0c8916c3 SR |
3105 | |
3106 | tr->event_dir = NULL; | |
3107 | ||
3108 | mutex_unlock(&event_mutex); | |
3109 | ||
3110 | return 0; | |
3111 | } | |
3112 | ||
d1a29143 SR |
3113 | static __init int event_trace_memsetup(void) |
3114 | { | |
3115 | field_cachep = KMEM_CACHE(ftrace_event_field, SLAB_PANIC); | |
7f1d2f82 | 3116 | file_cachep = KMEM_CACHE(trace_event_file, SLAB_PANIC); |
d1a29143 SR |
3117 | return 0; |
3118 | } | |
3119 | ||
ce1039bd SRRH |
3120 | static __init void |
3121 | early_enable_events(struct trace_array *tr, bool disable_first) | |
3122 | { | |
3123 | char *buf = bootup_event_buf; | |
3124 | char *token; | |
3125 | int ret; | |
3126 | ||
3127 | while (true) { | |
3128 | token = strsep(&buf, ","); | |
3129 | ||
3130 | if (!token) | |
3131 | break; | |
ce1039bd | 3132 | |
43ed3843 SRRH |
3133 | if (*token) { |
3134 | /* Restarting syscalls requires that we stop them first */ | |
3135 | if (disable_first) | |
3136 | ftrace_set_clr_event(tr, token, 0); | |
ce1039bd | 3137 | |
43ed3843 SRRH |
3138 | ret = ftrace_set_clr_event(tr, token, 1); |
3139 | if (ret) | |
3140 | pr_warn("Failed to enable trace event: %s\n", token); | |
3141 | } | |
ce1039bd SRRH |
3142 | |
3143 | /* Put back the comma to allow this to be called again */ | |
3144 | if (buf) | |
3145 | *(buf - 1) = ','; | |
3146 | } | |
3147 | } | |
3148 | ||
8781915a EG |
3149 | static __init int event_trace_enable(void) |
3150 | { | |
ae63b31e | 3151 | struct trace_array *tr = top_trace_array(); |
2425bcb9 | 3152 | struct trace_event_call **iter, *call; |
8781915a EG |
3153 | int ret; |
3154 | ||
dc81e5e3 YY |
3155 | if (!tr) |
3156 | return -ENODEV; | |
3157 | ||
8781915a EG |
3158 | for_each_event(iter, __start_ftrace_events, __stop_ftrace_events) { |
3159 | ||
3160 | call = *iter; | |
3161 | ret = event_init(call); | |
3162 | if (!ret) | |
3163 | list_add(&call->list, &ftrace_events); | |
3164 | } | |
3165 | ||
77248221 SR |
3166 | /* |
3167 | * We need the top trace array to have a working set of trace | |
3168 | * points at early init, before the debug files and directories | |
3169 | * are created. Create the file entries now, and attach them | |
3170 | * to the actual file dentries later. | |
3171 | */ | |
3172 | __trace_early_add_events(tr); | |
3173 | ||
ce1039bd | 3174 | early_enable_events(tr, false); |
81698831 SR |
3175 | |
3176 | trace_printk_start_comm(); | |
3177 | ||
3cd715de SRRH |
3178 | register_event_cmds(); |
3179 | ||
85f2b082 TZ |
3180 | register_trigger_cmds(); |
3181 | ||
8781915a EG |
3182 | return 0; |
3183 | } | |
3184 | ||
ce1039bd SRRH |
3185 | /* |
3186 | * event_trace_enable() is called from trace_event_init() first to | |
3187 | * initialize events and perhaps start any events that are on the | |
3188 | * command line. Unfortunately, there are some events that will not | |
3189 | * start this early, like the system call tracepoints that need | |
3190 | * to set the TIF_SYSCALL_TRACEPOINT flag of pid 1. But event_trace_enable() | |
3191 | * is called before pid 1 starts, and this flag is never set, making | |
3192 | * the syscall tracepoint never get reached, but the event is enabled | |
3193 | * regardless (and not doing anything). | |
3194 | */ | |
3195 | static __init int event_trace_enable_again(void) | |
3196 | { | |
3197 | struct trace_array *tr; | |
3198 | ||
3199 | tr = top_trace_array(); | |
3200 | if (!tr) | |
3201 | return -ENODEV; | |
3202 | ||
3203 | early_enable_events(tr, true); | |
3204 | ||
3205 | return 0; | |
3206 | } | |
3207 | ||
3208 | early_initcall(event_trace_enable_again); | |
3209 | ||
b77e38aa SR |
3210 | static __init int event_trace_init(void) |
3211 | { | |
ae63b31e | 3212 | struct trace_array *tr; |
b77e38aa SR |
3213 | struct dentry *d_tracer; |
3214 | struct dentry *entry; | |
6d723736 | 3215 | int ret; |
b77e38aa | 3216 | |
ae63b31e | 3217 | tr = top_trace_array(); |
dc81e5e3 YY |
3218 | if (!tr) |
3219 | return -ENODEV; | |
ae63b31e | 3220 | |
b77e38aa | 3221 | d_tracer = tracing_init_dentry(); |
14a5ae40 | 3222 | if (IS_ERR(d_tracer)) |
b77e38aa SR |
3223 | return 0; |
3224 | ||
8434dc93 | 3225 | entry = tracefs_create_file("available_events", 0444, d_tracer, |
ae63b31e | 3226 | tr, &ftrace_avail_fops); |
2314c4ae | 3227 | if (!entry) |
8434dc93 | 3228 | pr_warn("Could not create tracefs 'available_events' entry\n"); |
2314c4ae | 3229 | |
9f616680 DW |
3230 | if (trace_define_generic_fields()) |
3231 | pr_warn("tracing: Failed to allocated generic fields"); | |
3232 | ||
8728fe50 | 3233 | if (trace_define_common_fields()) |
3448bac3 | 3234 | pr_warn("tracing: Failed to allocate common fields"); |
8728fe50 | 3235 | |
77248221 | 3236 | ret = early_event_add_tracer(d_tracer, tr); |
ae63b31e SR |
3237 | if (ret) |
3238 | return ret; | |
020e5f85 | 3239 | |
836d481e | 3240 | #ifdef CONFIG_MODULES |
6d723736 | 3241 | ret = register_module_notifier(&trace_module_nb); |
55379376 | 3242 | if (ret) |
3448bac3 | 3243 | pr_warn("Failed to register trace events module notifier\n"); |
836d481e | 3244 | #endif |
b77e38aa SR |
3245 | return 0; |
3246 | } | |
5f893b26 SRRH |
3247 | |
3248 | void __init trace_event_init(void) | |
3249 | { | |
3250 | event_trace_memsetup(); | |
3251 | init_ftrace_syscalls(); | |
3252 | event_trace_enable(); | |
3253 | } | |
3254 | ||
b77e38aa | 3255 | fs_initcall(event_trace_init); |
e6187007 SR |
3256 | |
3257 | #ifdef CONFIG_FTRACE_STARTUP_TEST | |
3258 | ||
3259 | static DEFINE_SPINLOCK(test_spinlock); | |
3260 | static DEFINE_SPINLOCK(test_spinlock_irq); | |
3261 | static DEFINE_MUTEX(test_mutex); | |
3262 | ||
3263 | static __init void test_work(struct work_struct *dummy) | |
3264 | { | |
3265 | spin_lock(&test_spinlock); | |
3266 | spin_lock_irq(&test_spinlock_irq); | |
3267 | udelay(1); | |
3268 | spin_unlock_irq(&test_spinlock_irq); | |
3269 | spin_unlock(&test_spinlock); | |
3270 | ||
3271 | mutex_lock(&test_mutex); | |
3272 | msleep(1); | |
3273 | mutex_unlock(&test_mutex); | |
3274 | } | |
3275 | ||
3276 | static __init int event_test_thread(void *unused) | |
3277 | { | |
3278 | void *test_malloc; | |
3279 | ||
3280 | test_malloc = kmalloc(1234, GFP_KERNEL); | |
3281 | if (!test_malloc) | |
3282 | pr_info("failed to kmalloc\n"); | |
3283 | ||
3284 | schedule_on_each_cpu(test_work); | |
3285 | ||
3286 | kfree(test_malloc); | |
3287 | ||
3288 | set_current_state(TASK_INTERRUPTIBLE); | |
fe0e01c7 | 3289 | while (!kthread_should_stop()) { |
e6187007 | 3290 | schedule(); |
fe0e01c7 PZ |
3291 | set_current_state(TASK_INTERRUPTIBLE); |
3292 | } | |
3293 | __set_current_state(TASK_RUNNING); | |
e6187007 SR |
3294 | |
3295 | return 0; | |
3296 | } | |
3297 | ||
3298 | /* | |
3299 | * Do various things that may trigger events. | |
3300 | */ | |
3301 | static __init void event_test_stuff(void) | |
3302 | { | |
3303 | struct task_struct *test_thread; | |
3304 | ||
3305 | test_thread = kthread_run(event_test_thread, NULL, "test-events"); | |
3306 | msleep(1); | |
3307 | kthread_stop(test_thread); | |
3308 | } | |
3309 | ||
3310 | /* | |
3311 | * For every trace event defined, we will test each trace point separately, | |
3312 | * and then by groups, and finally all trace points. | |
3313 | */ | |
9ea21c1e | 3314 | static __init void event_trace_self_tests(void) |
e6187007 | 3315 | { |
7967b3e0 | 3316 | struct trace_subsystem_dir *dir; |
7f1d2f82 | 3317 | struct trace_event_file *file; |
2425bcb9 | 3318 | struct trace_event_call *call; |
e6187007 | 3319 | struct event_subsystem *system; |
ae63b31e | 3320 | struct trace_array *tr; |
e6187007 SR |
3321 | int ret; |
3322 | ||
ae63b31e | 3323 | tr = top_trace_array(); |
dc81e5e3 YY |
3324 | if (!tr) |
3325 | return; | |
ae63b31e | 3326 | |
e6187007 SR |
3327 | pr_info("Running tests on trace events:\n"); |
3328 | ||
ae63b31e SR |
3329 | list_for_each_entry(file, &tr->events, list) { |
3330 | ||
3331 | call = file->event_call; | |
e6187007 | 3332 | |
2239291a SR |
3333 | /* Only test those that have a probe */ |
3334 | if (!call->class || !call->class->probe) | |
e6187007 SR |
3335 | continue; |
3336 | ||
1f5a6b45 SR |
3337 | /* |
3338 | * Testing syscall events here is pretty useless, but | |
3339 | * we still do it if configured. But this is time consuming. | |
3340 | * What we really need is a user thread to perform the | |
3341 | * syscalls as we test. | |
3342 | */ | |
3343 | #ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS | |
8f082018 SR |
3344 | if (call->class->system && |
3345 | strcmp(call->class->system, "syscalls") == 0) | |
1f5a6b45 SR |
3346 | continue; |
3347 | #endif | |
3348 | ||
687fcc4a | 3349 | pr_info("Testing event %s: ", trace_event_name(call)); |
e6187007 SR |
3350 | |
3351 | /* | |
3352 | * If an event is already enabled, someone is using | |
3353 | * it and the self test should not be on. | |
3354 | */ | |
5d6ad960 | 3355 | if (file->flags & EVENT_FILE_FL_ENABLED) { |
3448bac3 | 3356 | pr_warn("Enabled event during self test!\n"); |
e6187007 SR |
3357 | WARN_ON_ONCE(1); |
3358 | continue; | |
3359 | } | |
3360 | ||
ae63b31e | 3361 | ftrace_event_enable_disable(file, 1); |
e6187007 | 3362 | event_test_stuff(); |
ae63b31e | 3363 | ftrace_event_enable_disable(file, 0); |
e6187007 SR |
3364 | |
3365 | pr_cont("OK\n"); | |
3366 | } | |
3367 | ||
3368 | /* Now test at the sub system level */ | |
3369 | ||
3370 | pr_info("Running tests on trace event systems:\n"); | |
3371 | ||
ae63b31e SR |
3372 | list_for_each_entry(dir, &tr->systems, list) { |
3373 | ||
3374 | system = dir->subsystem; | |
e6187007 SR |
3375 | |
3376 | /* the ftrace system is special, skip it */ | |
3377 | if (strcmp(system->name, "ftrace") == 0) | |
3378 | continue; | |
3379 | ||
3380 | pr_info("Testing event system %s: ", system->name); | |
3381 | ||
ae63b31e | 3382 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 1); |
e6187007 | 3383 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3384 | pr_warn("error enabling system %s\n", |
3385 | system->name); | |
e6187007 SR |
3386 | continue; |
3387 | } | |
3388 | ||
3389 | event_test_stuff(); | |
3390 | ||
ae63b31e | 3391 | ret = __ftrace_set_clr_event(tr, NULL, system->name, NULL, 0); |
76bab1b7 | 3392 | if (WARN_ON_ONCE(ret)) { |
3448bac3 FF |
3393 | pr_warn("error disabling system %s\n", |
3394 | system->name); | |
76bab1b7 YL |
3395 | continue; |
3396 | } | |
e6187007 SR |
3397 | |
3398 | pr_cont("OK\n"); | |
3399 | } | |
3400 | ||
3401 | /* Test with all events enabled */ | |
3402 | ||
3403 | pr_info("Running tests on all trace events:\n"); | |
3404 | pr_info("Testing all events: "); | |
3405 | ||
ae63b31e | 3406 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 1); |
e6187007 | 3407 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3408 | pr_warn("error enabling all events\n"); |
9ea21c1e | 3409 | return; |
e6187007 SR |
3410 | } |
3411 | ||
3412 | event_test_stuff(); | |
3413 | ||
3414 | /* reset sysname */ | |
ae63b31e | 3415 | ret = __ftrace_set_clr_event(tr, NULL, NULL, NULL, 0); |
e6187007 | 3416 | if (WARN_ON_ONCE(ret)) { |
3448bac3 | 3417 | pr_warn("error disabling all events\n"); |
9ea21c1e | 3418 | return; |
e6187007 SR |
3419 | } |
3420 | ||
3421 | pr_cont("OK\n"); | |
9ea21c1e SR |
3422 | } |
3423 | ||
3424 | #ifdef CONFIG_FUNCTION_TRACER | |
3425 | ||
245b2e70 | 3426 | static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable); |
9ea21c1e | 3427 | |
9b9db275 | 3428 | static struct trace_event_file event_trace_file __initdata; |
b7f0c959 SRRH |
3429 | |
3430 | static void __init | |
2f5f6ad9 | 3431 | function_test_events_call(unsigned long ip, unsigned long parent_ip, |
a1e2e31d | 3432 | struct ftrace_ops *op, struct pt_regs *pt_regs) |
9ea21c1e SR |
3433 | { |
3434 | struct ring_buffer_event *event; | |
e77405ad | 3435 | struct ring_buffer *buffer; |
9ea21c1e SR |
3436 | struct ftrace_entry *entry; |
3437 | unsigned long flags; | |
3438 | long disabled; | |
9ea21c1e SR |
3439 | int cpu; |
3440 | int pc; | |
3441 | ||
3442 | pc = preempt_count(); | |
5168ae50 | 3443 | preempt_disable_notrace(); |
9ea21c1e | 3444 | cpu = raw_smp_processor_id(); |
245b2e70 | 3445 | disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu)); |
9ea21c1e SR |
3446 | |
3447 | if (disabled != 1) | |
3448 | goto out; | |
3449 | ||
3450 | local_save_flags(flags); | |
3451 | ||
9b9db275 SRRH |
3452 | event = trace_event_buffer_lock_reserve(&buffer, &event_trace_file, |
3453 | TRACE_FN, sizeof(*entry), | |
3454 | flags, pc); | |
9ea21c1e SR |
3455 | if (!event) |
3456 | goto out; | |
3457 | entry = ring_buffer_event_data(event); | |
3458 | entry->ip = ip; | |
3459 | entry->parent_ip = parent_ip; | |
3460 | ||
9b9db275 SRRH |
3461 | event_trigger_unlock_commit(&event_trace_file, buffer, event, |
3462 | entry, flags, pc); | |
9ea21c1e | 3463 | out: |
245b2e70 | 3464 | atomic_dec(&per_cpu(ftrace_test_event_disable, cpu)); |
5168ae50 | 3465 | preempt_enable_notrace(); |
9ea21c1e SR |
3466 | } |
3467 | ||
3468 | static struct ftrace_ops trace_ops __initdata = | |
3469 | { | |
3470 | .func = function_test_events_call, | |
4740974a | 3471 | .flags = FTRACE_OPS_FL_RECURSION_SAFE, |
9ea21c1e SR |
3472 | }; |
3473 | ||
3474 | static __init void event_trace_self_test_with_function(void) | |
3475 | { | |
17bb615a | 3476 | int ret; |
9b9db275 SRRH |
3477 | |
3478 | event_trace_file.tr = top_trace_array(); | |
3479 | if (WARN_ON(!event_trace_file.tr)) | |
2d34f489 | 3480 | return; |
9b9db275 | 3481 | |
17bb615a SR |
3482 | ret = register_ftrace_function(&trace_ops); |
3483 | if (WARN_ON(ret < 0)) { | |
3484 | pr_info("Failed to enable function tracer for event tests\n"); | |
3485 | return; | |
3486 | } | |
9ea21c1e SR |
3487 | pr_info("Running tests again, along with the function tracer\n"); |
3488 | event_trace_self_tests(); | |
3489 | unregister_ftrace_function(&trace_ops); | |
3490 | } | |
3491 | #else | |
3492 | static __init void event_trace_self_test_with_function(void) | |
3493 | { | |
3494 | } | |
3495 | #endif | |
3496 | ||
3497 | static __init int event_trace_self_tests_init(void) | |
3498 | { | |
020e5f85 LZ |
3499 | if (!tracing_selftest_disabled) { |
3500 | event_trace_self_tests(); | |
3501 | event_trace_self_test_with_function(); | |
3502 | } | |
e6187007 SR |
3503 | |
3504 | return 0; | |
3505 | } | |
3506 | ||
28d20e2d | 3507 | late_initcall(event_trace_self_tests_init); |
e6187007 SR |
3508 | |
3509 | #endif |