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