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