Commit | Line | Data |
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bac5fb97 | 1 | |
97f20251 SR |
2 | #ifndef _LINUX_FTRACE_EVENT_H |
3 | #define _LINUX_FTRACE_EVENT_H | |
4 | ||
97f20251 | 5 | #include <linux/ring_buffer.h> |
16bb8eb1 | 6 | #include <linux/trace_seq.h> |
be74b73a | 7 | #include <linux/percpu.h> |
20ab4425 | 8 | #include <linux/hardirq.h> |
430ad5a6 | 9 | #include <linux/perf_event.h> |
de7b2973 | 10 | #include <linux/tracepoint.h> |
97f20251 SR |
11 | |
12 | struct trace_array; | |
12883efb | 13 | struct trace_buffer; |
97f20251 | 14 | struct tracer; |
6d723736 | 15 | struct dentry; |
97f20251 | 16 | |
be74b73a SR |
17 | struct trace_print_flags { |
18 | unsigned long mask; | |
19 | const char *name; | |
20 | }; | |
21 | ||
2fc1b6f0 | 22 | struct trace_print_flags_u64 { |
23 | unsigned long long mask; | |
24 | const char *name; | |
25 | }; | |
26 | ||
be74b73a SR |
27 | const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim, |
28 | unsigned long flags, | |
29 | const struct trace_print_flags *flag_array); | |
30 | ||
0f4fc29d SR |
31 | const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val, |
32 | const struct trace_print_flags *symbol_array); | |
33 | ||
2fc1b6f0 | 34 | #if BITS_PER_LONG == 32 |
35 | const char *ftrace_print_symbols_seq_u64(struct trace_seq *p, | |
36 | unsigned long long val, | |
37 | const struct trace_print_flags_u64 | |
38 | *symbol_array); | |
39 | #endif | |
40 | ||
4449bf92 SRRH |
41 | const char *ftrace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr, |
42 | unsigned int bitmask_size); | |
43 | ||
5a2e3995 KT |
44 | const char *ftrace_print_hex_seq(struct trace_seq *p, |
45 | const unsigned char *buf, int len); | |
46 | ||
f71130de LZ |
47 | struct trace_iterator; |
48 | struct trace_event; | |
49 | ||
50 | int ftrace_raw_output_prep(struct trace_iterator *iter, | |
51 | struct trace_event *event); | |
52 | ||
97f20251 SR |
53 | /* |
54 | * The trace entry - the most basic unit of tracing. This is what | |
55 | * is printed in the end as a single line in the trace output, such as: | |
56 | * | |
57 | * bash-15816 [01] 235.197585: idle_cpu <- irq_enter | |
58 | */ | |
59 | struct trace_entry { | |
89ec0dee | 60 | unsigned short type; |
97f20251 SR |
61 | unsigned char flags; |
62 | unsigned char preempt_count; | |
63 | int pid; | |
97f20251 SR |
64 | }; |
65 | ||
89ec0dee SR |
66 | #define FTRACE_MAX_EVENT \ |
67 | ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1) | |
68 | ||
97f20251 SR |
69 | /* |
70 | * Trace iterator - used by printout routines who present trace | |
71 | * results to users and which routines might sleep, etc: | |
72 | */ | |
73 | struct trace_iterator { | |
74 | struct trace_array *tr; | |
75 | struct tracer *trace; | |
12883efb | 76 | struct trace_buffer *trace_buffer; |
97f20251 SR |
77 | void *private; |
78 | int cpu_file; | |
79 | struct mutex mutex; | |
6d158a81 | 80 | struct ring_buffer_iter **buffer_iter; |
112f38a7 | 81 | unsigned long iter_flags; |
97f20251 | 82 | |
bc289ae9 LJ |
83 | /* trace_seq for __print_flags() and __print_symbolic() etc. */ |
84 | struct trace_seq tmp_seq; | |
85 | ||
ed5467da AV |
86 | cpumask_var_t started; |
87 | ||
88 | /* it's true when current open file is snapshot */ | |
89 | bool snapshot; | |
90 | ||
97f20251 SR |
91 | /* The below is zeroed out in pipe_read */ |
92 | struct trace_seq seq; | |
93 | struct trace_entry *ent; | |
bc21b478 | 94 | unsigned long lost_events; |
a63ce5b3 | 95 | int leftover; |
4a9bd3f1 | 96 | int ent_size; |
97f20251 SR |
97 | int cpu; |
98 | u64 ts; | |
99 | ||
97f20251 SR |
100 | loff_t pos; |
101 | long idx; | |
102 | ||
ed5467da | 103 | /* All new field here will be zeroed out in pipe_read */ |
97f20251 SR |
104 | }; |
105 | ||
8be0709f DS |
106 | enum trace_iter_flags { |
107 | TRACE_FILE_LAT_FMT = 1, | |
108 | TRACE_FILE_ANNOTATE = 2, | |
109 | TRACE_FILE_TIME_IN_NS = 4, | |
110 | }; | |
111 | ||
97f20251 SR |
112 | |
113 | typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter, | |
a9a57763 SR |
114 | int flags, struct trace_event *event); |
115 | ||
116 | struct trace_event_functions { | |
97f20251 SR |
117 | trace_print_func trace; |
118 | trace_print_func raw; | |
119 | trace_print_func hex; | |
120 | trace_print_func binary; | |
121 | }; | |
122 | ||
a9a57763 SR |
123 | struct trace_event { |
124 | struct hlist_node node; | |
125 | struct list_head list; | |
126 | int type; | |
127 | struct trace_event_functions *funcs; | |
128 | }; | |
129 | ||
97f20251 SR |
130 | extern int register_ftrace_event(struct trace_event *event); |
131 | extern int unregister_ftrace_event(struct trace_event *event); | |
132 | ||
133 | /* Return values for print_line callback */ | |
134 | enum print_line_t { | |
135 | TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */ | |
136 | TRACE_TYPE_HANDLED = 1, | |
137 | TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */ | |
138 | TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */ | |
139 | }; | |
140 | ||
19a7fe20 SRRH |
141 | /* |
142 | * Several functions return TRACE_TYPE_PARTIAL_LINE if the trace_seq | |
143 | * overflowed, and TRACE_TYPE_HANDLED otherwise. This helper function | |
144 | * simplifies those functions and keeps them in sync. | |
145 | */ | |
146 | static inline enum print_line_t trace_handle_return(struct trace_seq *s) | |
147 | { | |
148 | return trace_seq_has_overflowed(s) ? | |
149 | TRACE_TYPE_PARTIAL_LINE : TRACE_TYPE_HANDLED; | |
150 | } | |
151 | ||
f413cdb8 FW |
152 | void tracing_generic_entry_update(struct trace_entry *entry, |
153 | unsigned long flags, | |
154 | int pc); | |
ccb469a1 SR |
155 | struct ftrace_event_file; |
156 | ||
157 | struct ring_buffer_event * | |
158 | trace_event_buffer_lock_reserve(struct ring_buffer **current_buffer, | |
159 | struct ftrace_event_file *ftrace_file, | |
160 | int type, unsigned long len, | |
161 | unsigned long flags, int pc); | |
97f20251 | 162 | struct ring_buffer_event * |
e77405ad SR |
163 | trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer, |
164 | int type, unsigned long len, | |
97f20251 | 165 | unsigned long flags, int pc); |
e77405ad SR |
166 | void trace_current_buffer_unlock_commit(struct ring_buffer *buffer, |
167 | struct ring_buffer_event *event, | |
97f20251 | 168 | unsigned long flags, int pc); |
0d5c6e1c SR |
169 | void trace_buffer_unlock_commit(struct ring_buffer *buffer, |
170 | struct ring_buffer_event *event, | |
171 | unsigned long flags, int pc); | |
172 | void trace_buffer_unlock_commit_regs(struct ring_buffer *buffer, | |
173 | struct ring_buffer_event *event, | |
174 | unsigned long flags, int pc, | |
175 | struct pt_regs *regs); | |
e77405ad SR |
176 | void trace_current_buffer_discard_commit(struct ring_buffer *buffer, |
177 | struct ring_buffer_event *event); | |
97f20251 SR |
178 | |
179 | void tracing_record_cmdline(struct task_struct *tsk); | |
180 | ||
1d6bae96 SR |
181 | int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...); |
182 | ||
1f9963cb LZ |
183 | struct event_filter; |
184 | ||
2239291a SR |
185 | enum trace_reg { |
186 | TRACE_REG_REGISTER, | |
187 | TRACE_REG_UNREGISTER, | |
37d73998 | 188 | #ifdef CONFIG_PERF_EVENTS |
2239291a SR |
189 | TRACE_REG_PERF_REGISTER, |
190 | TRACE_REG_PERF_UNREGISTER, | |
ceec0b6f JO |
191 | TRACE_REG_PERF_OPEN, |
192 | TRACE_REG_PERF_CLOSE, | |
489c75c3 JO |
193 | TRACE_REG_PERF_ADD, |
194 | TRACE_REG_PERF_DEL, | |
37d73998 | 195 | #endif |
2239291a SR |
196 | }; |
197 | ||
198 | struct ftrace_event_call; | |
199 | ||
8f082018 SR |
200 | struct ftrace_event_class { |
201 | char *system; | |
2239291a SR |
202 | void *probe; |
203 | #ifdef CONFIG_PERF_EVENTS | |
204 | void *perf_probe; | |
205 | #endif | |
206 | int (*reg)(struct ftrace_event_call *event, | |
ceec0b6f | 207 | enum trace_reg type, void *data); |
2e33af02 SR |
208 | int (*define_fields)(struct ftrace_event_call *); |
209 | struct list_head *(*get_fields)(struct ftrace_event_call *); | |
210 | struct list_head fields; | |
0405ab80 | 211 | int (*raw_init)(struct ftrace_event_call *); |
8f082018 SR |
212 | }; |
213 | ||
a1d0ce82 | 214 | extern int ftrace_event_reg(struct ftrace_event_call *event, |
ceec0b6f | 215 | enum trace_reg type, void *data); |
a1d0ce82 | 216 | |
1d6bae96 SR |
217 | int ftrace_output_event(struct trace_iterator *iter, struct ftrace_event_call *event, |
218 | char *fmt, ...); | |
219 | ||
35bb4399 SR |
220 | int ftrace_event_define_field(struct ftrace_event_call *call, |
221 | char *type, int len, char *item, int offset, | |
222 | int field_size, int sign, int filter); | |
223 | ||
3fd40d1e SR |
224 | struct ftrace_event_buffer { |
225 | struct ring_buffer *buffer; | |
226 | struct ring_buffer_event *event; | |
227 | struct ftrace_event_file *ftrace_file; | |
228 | void *entry; | |
229 | unsigned long flags; | |
230 | int pc; | |
231 | }; | |
232 | ||
233 | void *ftrace_event_buffer_reserve(struct ftrace_event_buffer *fbuffer, | |
234 | struct ftrace_event_file *ftrace_file, | |
235 | unsigned long len); | |
236 | ||
237 | void ftrace_event_buffer_commit(struct ftrace_event_buffer *fbuffer); | |
238 | ||
bc4c426e SRRH |
239 | int ftrace_event_define_field(struct ftrace_event_call *call, |
240 | char *type, int len, char *item, int offset, | |
241 | int field_size, int sign, int filter); | |
242 | ||
553552ce | 243 | enum { |
553552ce | 244 | TRACE_EVENT_FL_FILTERED_BIT, |
61c32659 | 245 | TRACE_EVENT_FL_CAP_ANY_BIT, |
27b14b56 | 246 | TRACE_EVENT_FL_NO_SET_FILTER_BIT, |
9b63776f | 247 | TRACE_EVENT_FL_IGNORE_ENABLE_BIT, |
575380da | 248 | TRACE_EVENT_FL_WAS_ENABLED_BIT, |
f306cc82 | 249 | TRACE_EVENT_FL_USE_CALL_FILTER_BIT, |
de7b2973 | 250 | TRACE_EVENT_FL_TRACEPOINT_BIT, |
553552ce SR |
251 | }; |
252 | ||
ae63b31e SR |
253 | /* |
254 | * Event flags: | |
255 | * FILTERED - The event has a filter attached | |
256 | * CAP_ANY - Any user can enable for perf | |
257 | * NO_SET_FILTER - Set when filter has error and is to be ignored | |
2a30c11f | 258 | * IGNORE_ENABLE - For ftrace internal events, do not enable with debugfs file |
575380da SRRH |
259 | * WAS_ENABLED - Set and stays set when an event was ever enabled |
260 | * (used for module unloading, if a module event is enabled, | |
261 | * it is best to clear the buffers that used it). | |
f306cc82 | 262 | * USE_CALL_FILTER - For ftrace internal events, don't use file filter |
de7b2973 | 263 | * TRACEPOINT - Event is a tracepoint |
ae63b31e | 264 | */ |
553552ce | 265 | enum { |
e870e9a1 | 266 | TRACE_EVENT_FL_FILTERED = (1 << TRACE_EVENT_FL_FILTERED_BIT), |
61c32659 | 267 | TRACE_EVENT_FL_CAP_ANY = (1 << TRACE_EVENT_FL_CAP_ANY_BIT), |
27b14b56 | 268 | TRACE_EVENT_FL_NO_SET_FILTER = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT), |
9b63776f | 269 | TRACE_EVENT_FL_IGNORE_ENABLE = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT), |
575380da | 270 | TRACE_EVENT_FL_WAS_ENABLED = (1 << TRACE_EVENT_FL_WAS_ENABLED_BIT), |
f306cc82 | 271 | TRACE_EVENT_FL_USE_CALL_FILTER = (1 << TRACE_EVENT_FL_USE_CALL_FILTER_BIT), |
de7b2973 | 272 | TRACE_EVENT_FL_TRACEPOINT = (1 << TRACE_EVENT_FL_TRACEPOINT_BIT), |
553552ce SR |
273 | }; |
274 | ||
97f20251 | 275 | struct ftrace_event_call { |
a59fd602 | 276 | struct list_head list; |
8f082018 | 277 | struct ftrace_event_class *class; |
de7b2973 MD |
278 | union { |
279 | char *name; | |
280 | /* Set TRACE_EVENT_FL_TRACEPOINT flag when using "tp" */ | |
281 | struct tracepoint *tp; | |
282 | }; | |
80decc70 | 283 | struct trace_event event; |
509e760c | 284 | const char *print_fmt; |
1f9963cb | 285 | struct event_filter *filter; |
6d723736 | 286 | void *mod; |
69fd4f0e | 287 | void *data; |
57d01ad0 SRRH |
288 | /* |
289 | * bit 0: filter_active | |
290 | * bit 1: allow trace by non root (cap any) | |
291 | * bit 2: failed to apply filter | |
292 | * bit 3: ftrace internal event (do not enable) | |
293 | * bit 4: Event was enabled by module | |
f306cc82 | 294 | * bit 5: use call filter rather than file filter |
de7b2973 | 295 | * bit 6: Event is a tracepoint |
57d01ad0 | 296 | */ |
ae63b31e SR |
297 | int flags; /* static flags of different events */ |
298 | ||
299 | #ifdef CONFIG_PERF_EVENTS | |
300 | int perf_refcount; | |
301 | struct hlist_head __percpu *perf_events; | |
d5b5f391 PZ |
302 | |
303 | int (*perf_perm)(struct ftrace_event_call *, | |
304 | struct perf_event *); | |
ae63b31e SR |
305 | #endif |
306 | }; | |
307 | ||
de7b2973 MD |
308 | static inline const char * |
309 | ftrace_event_name(struct ftrace_event_call *call) | |
310 | { | |
311 | if (call->flags & TRACE_EVENT_FL_TRACEPOINT) | |
312 | return call->tp ? call->tp->name : NULL; | |
313 | else | |
314 | return call->name; | |
315 | } | |
316 | ||
ae63b31e SR |
317 | struct trace_array; |
318 | struct ftrace_subsystem_dir; | |
319 | ||
320 | enum { | |
321 | FTRACE_EVENT_FL_ENABLED_BIT, | |
322 | FTRACE_EVENT_FL_RECORDED_CMD_BIT, | |
f306cc82 TZ |
323 | FTRACE_EVENT_FL_FILTERED_BIT, |
324 | FTRACE_EVENT_FL_NO_SET_FILTER_BIT, | |
417944c4 SRRH |
325 | FTRACE_EVENT_FL_SOFT_MODE_BIT, |
326 | FTRACE_EVENT_FL_SOFT_DISABLED_BIT, | |
85f2b082 | 327 | FTRACE_EVENT_FL_TRIGGER_MODE_BIT, |
bac5fb97 | 328 | FTRACE_EVENT_FL_TRIGGER_COND_BIT, |
ae63b31e SR |
329 | }; |
330 | ||
331 | /* | |
332 | * Ftrace event file flags: | |
57d01ad0 | 333 | * ENABLED - The event is enabled |
ae63b31e | 334 | * RECORDED_CMD - The comms should be recorded at sched_switch |
f306cc82 TZ |
335 | * FILTERED - The event has a filter attached |
336 | * NO_SET_FILTER - Set when filter has error and is to be ignored | |
417944c4 SRRH |
337 | * SOFT_MODE - The event is enabled/disabled by SOFT_DISABLED |
338 | * SOFT_DISABLED - When set, do not trace the event (even though its | |
339 | * tracepoint may be enabled) | |
85f2b082 | 340 | * TRIGGER_MODE - When set, invoke the triggers associated with the event |
bac5fb97 | 341 | * TRIGGER_COND - When set, one or more triggers has an associated filter |
ae63b31e SR |
342 | */ |
343 | enum { | |
344 | FTRACE_EVENT_FL_ENABLED = (1 << FTRACE_EVENT_FL_ENABLED_BIT), | |
345 | FTRACE_EVENT_FL_RECORDED_CMD = (1 << FTRACE_EVENT_FL_RECORDED_CMD_BIT), | |
f306cc82 TZ |
346 | FTRACE_EVENT_FL_FILTERED = (1 << FTRACE_EVENT_FL_FILTERED_BIT), |
347 | FTRACE_EVENT_FL_NO_SET_FILTER = (1 << FTRACE_EVENT_FL_NO_SET_FILTER_BIT), | |
417944c4 SRRH |
348 | FTRACE_EVENT_FL_SOFT_MODE = (1 << FTRACE_EVENT_FL_SOFT_MODE_BIT), |
349 | FTRACE_EVENT_FL_SOFT_DISABLED = (1 << FTRACE_EVENT_FL_SOFT_DISABLED_BIT), | |
85f2b082 | 350 | FTRACE_EVENT_FL_TRIGGER_MODE = (1 << FTRACE_EVENT_FL_TRIGGER_MODE_BIT), |
bac5fb97 | 351 | FTRACE_EVENT_FL_TRIGGER_COND = (1 << FTRACE_EVENT_FL_TRIGGER_COND_BIT), |
ae63b31e SR |
352 | }; |
353 | ||
354 | struct ftrace_event_file { | |
355 | struct list_head list; | |
356 | struct ftrace_event_call *event_call; | |
f306cc82 | 357 | struct event_filter *filter; |
ae63b31e SR |
358 | struct dentry *dir; |
359 | struct trace_array *tr; | |
360 | struct ftrace_subsystem_dir *system; | |
85f2b082 | 361 | struct list_head triggers; |
97f20251 | 362 | |
553552ce SR |
363 | /* |
364 | * 32 bit flags: | |
57d01ad0 SRRH |
365 | * bit 0: enabled |
366 | * bit 1: enabled cmd record | |
417944c4 SRRH |
367 | * bit 2: enable/disable with the soft disable bit |
368 | * bit 3: soft disabled | |
85f2b082 | 369 | * bit 4: trigger enabled |
553552ce | 370 | * |
417944c4 SRRH |
371 | * Note: The bits must be set atomically to prevent races |
372 | * from other writers. Reads of flags do not need to be in | |
373 | * sync as they occur in critical sections. But the way flags | |
ae63b31e | 374 | * is currently used, these changes do not affect the code |
1eaa4787 SR |
375 | * except that when a change is made, it may have a slight |
376 | * delay in propagating the changes to other CPUs due to | |
417944c4 | 377 | * caching and such. Which is mostly OK ;-) |
553552ce | 378 | */ |
417944c4 | 379 | unsigned long flags; |
1cf4c073 | 380 | atomic_t sm_ref; /* soft-mode reference counter */ |
85f2b082 | 381 | atomic_t tm_ref; /* trigger-mode reference counter */ |
97f20251 SR |
382 | }; |
383 | ||
53cf810b FW |
384 | #define __TRACE_EVENT_FLAGS(name, value) \ |
385 | static int __init trace_init_flags_##name(void) \ | |
386 | { \ | |
de7b2973 | 387 | event_##name.flags |= value; \ |
53cf810b FW |
388 | return 0; \ |
389 | } \ | |
390 | early_initcall(trace_init_flags_##name); | |
391 | ||
d5b5f391 PZ |
392 | #define __TRACE_EVENT_PERF_PERM(name, expr...) \ |
393 | static int perf_perm_##name(struct ftrace_event_call *tp_event, \ | |
394 | struct perf_event *p_event) \ | |
395 | { \ | |
396 | return ({ expr; }); \ | |
397 | } \ | |
398 | static int __init trace_init_perf_perm_##name(void) \ | |
399 | { \ | |
400 | event_##name.perf_perm = &perf_perm_##name; \ | |
401 | return 0; \ | |
402 | } \ | |
403 | early_initcall(trace_init_perf_perm_##name); | |
404 | ||
97d5a220 | 405 | #define PERF_MAX_TRACE_SIZE 2048 |
20ab4425 | 406 | |
16bb8eb1 | 407 | #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */ |
97f20251 | 408 | |
85f2b082 TZ |
409 | enum event_trigger_type { |
410 | ETT_NONE = (0), | |
2a2df321 | 411 | ETT_TRACE_ONOFF = (1 << 0), |
93e31ffb | 412 | ETT_SNAPSHOT = (1 << 1), |
f21ecbb3 | 413 | ETT_STACKTRACE = (1 << 2), |
7862ad18 | 414 | ETT_EVENT_ENABLE = (1 << 3), |
85f2b082 TZ |
415 | }; |
416 | ||
6fb2915d | 417 | extern int filter_match_preds(struct event_filter *filter, void *rec); |
f306cc82 TZ |
418 | |
419 | extern int filter_check_discard(struct ftrace_event_file *file, void *rec, | |
420 | struct ring_buffer *buffer, | |
421 | struct ring_buffer_event *event); | |
422 | extern int call_filter_check_discard(struct ftrace_event_call *call, void *rec, | |
423 | struct ring_buffer *buffer, | |
424 | struct ring_buffer_event *event); | |
bac5fb97 TZ |
425 | extern enum event_trigger_type event_triggers_call(struct ftrace_event_file *file, |
426 | void *rec); | |
427 | extern void event_triggers_post_call(struct ftrace_event_file *file, | |
428 | enum event_trigger_type tt); | |
97f20251 | 429 | |
13a1e4ae SRRH |
430 | /** |
431 | * ftrace_trigger_soft_disabled - do triggers and test if soft disabled | |
432 | * @file: The file pointer of the event to test | |
433 | * | |
434 | * If any triggers without filters are attached to this event, they | |
435 | * will be called here. If the event is soft disabled and has no | |
436 | * triggers that require testing the fields, it will return true, | |
437 | * otherwise false. | |
438 | */ | |
439 | static inline bool | |
440 | ftrace_trigger_soft_disabled(struct ftrace_event_file *file) | |
441 | { | |
442 | unsigned long eflags = file->flags; | |
443 | ||
444 | if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) { | |
445 | if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE) | |
446 | event_triggers_call(file, NULL); | |
447 | if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED) | |
448 | return true; | |
449 | } | |
450 | return false; | |
451 | } | |
452 | ||
453 | /* | |
454 | * Helper function for event_trigger_unlock_commit{_regs}(). | |
455 | * If there are event triggers attached to this event that requires | |
456 | * filtering against its fields, then they wil be called as the | |
457 | * entry already holds the field information of the current event. | |
458 | * | |
459 | * It also checks if the event should be discarded or not. | |
460 | * It is to be discarded if the event is soft disabled and the | |
461 | * event was only recorded to process triggers, or if the event | |
462 | * filter is active and this event did not match the filters. | |
463 | * | |
464 | * Returns true if the event is discarded, false otherwise. | |
465 | */ | |
466 | static inline bool | |
467 | __event_trigger_test_discard(struct ftrace_event_file *file, | |
468 | struct ring_buffer *buffer, | |
469 | struct ring_buffer_event *event, | |
470 | void *entry, | |
471 | enum event_trigger_type *tt) | |
472 | { | |
473 | unsigned long eflags = file->flags; | |
474 | ||
475 | if (eflags & FTRACE_EVENT_FL_TRIGGER_COND) | |
476 | *tt = event_triggers_call(file, entry); | |
477 | ||
478 | if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags)) | |
479 | ring_buffer_discard_commit(buffer, event); | |
480 | else if (!filter_check_discard(file, entry, buffer, event)) | |
481 | return false; | |
482 | ||
483 | return true; | |
484 | } | |
485 | ||
486 | /** | |
487 | * event_trigger_unlock_commit - handle triggers and finish event commit | |
488 | * @file: The file pointer assoctiated to the event | |
489 | * @buffer: The ring buffer that the event is being written to | |
490 | * @event: The event meta data in the ring buffer | |
491 | * @entry: The event itself | |
492 | * @irq_flags: The state of the interrupts at the start of the event | |
493 | * @pc: The state of the preempt count at the start of the event. | |
494 | * | |
495 | * This is a helper function to handle triggers that require data | |
496 | * from the event itself. It also tests the event against filters and | |
497 | * if the event is soft disabled and should be discarded. | |
498 | */ | |
499 | static inline void | |
500 | event_trigger_unlock_commit(struct ftrace_event_file *file, | |
501 | struct ring_buffer *buffer, | |
502 | struct ring_buffer_event *event, | |
503 | void *entry, unsigned long irq_flags, int pc) | |
504 | { | |
505 | enum event_trigger_type tt = ETT_NONE; | |
506 | ||
507 | if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) | |
508 | trace_buffer_unlock_commit(buffer, event, irq_flags, pc); | |
509 | ||
510 | if (tt) | |
511 | event_triggers_post_call(file, tt); | |
512 | } | |
513 | ||
514 | /** | |
515 | * event_trigger_unlock_commit_regs - handle triggers and finish event commit | |
516 | * @file: The file pointer assoctiated to the event | |
517 | * @buffer: The ring buffer that the event is being written to | |
518 | * @event: The event meta data in the ring buffer | |
519 | * @entry: The event itself | |
520 | * @irq_flags: The state of the interrupts at the start of the event | |
521 | * @pc: The state of the preempt count at the start of the event. | |
522 | * | |
523 | * This is a helper function to handle triggers that require data | |
524 | * from the event itself. It also tests the event against filters and | |
525 | * if the event is soft disabled and should be discarded. | |
526 | * | |
527 | * Same as event_trigger_unlock_commit() but calls | |
528 | * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit(). | |
529 | */ | |
530 | static inline void | |
531 | event_trigger_unlock_commit_regs(struct ftrace_event_file *file, | |
532 | struct ring_buffer *buffer, | |
533 | struct ring_buffer_event *event, | |
534 | void *entry, unsigned long irq_flags, int pc, | |
535 | struct pt_regs *regs) | |
536 | { | |
537 | enum event_trigger_type tt = ETT_NONE; | |
538 | ||
539 | if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) | |
540 | trace_buffer_unlock_commit_regs(buffer, event, | |
541 | irq_flags, pc, regs); | |
542 | ||
543 | if (tt) | |
544 | event_triggers_post_call(file, tt); | |
545 | } | |
546 | ||
43b51ead LZ |
547 | enum { |
548 | FILTER_OTHER = 0, | |
549 | FILTER_STATIC_STRING, | |
550 | FILTER_DYN_STRING, | |
87a342f5 | 551 | FILTER_PTR_STRING, |
02aa3162 | 552 | FILTER_TRACE_FN, |
43b51ead LZ |
553 | }; |
554 | ||
87d9b4e1 | 555 | extern int trace_event_raw_init(struct ftrace_event_call *call); |
aeaeae11 FW |
556 | extern int trace_define_field(struct ftrace_event_call *call, const char *type, |
557 | const char *name, int offset, int size, | |
558 | int is_signed, int filter_type); | |
bd1a5c84 | 559 | extern int trace_add_event_call(struct ftrace_event_call *call); |
2816c551 | 560 | extern int trace_remove_event_call(struct ftrace_event_call *call); |
97f20251 | 561 | |
d2802d07 | 562 | #define is_signed_type(type) (((type)(-1)) < (type)1) |
97f20251 | 563 | |
4671c794 SR |
564 | int trace_set_clr_event(const char *system, const char *event, int set); |
565 | ||
97f20251 SR |
566 | /* |
567 | * The double __builtin_constant_p is because gcc will give us an error | |
568 | * if we try to allocate the static variable to fmt if it is not a | |
569 | * constant. Even with the outer if statement optimizing out. | |
570 | */ | |
571 | #define event_trace_printk(ip, fmt, args...) \ | |
572 | do { \ | |
573 | __trace_printk_check_format(fmt, ##args); \ | |
574 | tracing_record_cmdline(current); \ | |
575 | if (__builtin_constant_p(fmt)) { \ | |
576 | static const char *trace_printk_fmt \ | |
577 | __attribute__((section("__trace_printk_fmt"))) = \ | |
578 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
579 | \ | |
580 | __trace_bprintk(ip, trace_printk_fmt, ##args); \ | |
581 | } else \ | |
582 | __trace_printk(ip, fmt, ##args); \ | |
583 | } while (0) | |
584 | ||
07b139c8 | 585 | #ifdef CONFIG_PERF_EVENTS |
6fb2915d | 586 | struct perf_event; |
c530665c FW |
587 | |
588 | DECLARE_PER_CPU(struct pt_regs, perf_trace_regs); | |
589 | ||
1c024eca PZ |
590 | extern int perf_trace_init(struct perf_event *event); |
591 | extern void perf_trace_destroy(struct perf_event *event); | |
a4eaf7f1 PZ |
592 | extern int perf_trace_add(struct perf_event *event, int flags); |
593 | extern void perf_trace_del(struct perf_event *event, int flags); | |
1c024eca | 594 | extern int ftrace_profile_set_filter(struct perf_event *event, int event_id, |
6fb2915d LZ |
595 | char *filter_str); |
596 | extern void ftrace_profile_free_filter(struct perf_event *event); | |
b7e2ecef PZ |
597 | extern void *perf_trace_buf_prepare(int size, unsigned short type, |
598 | struct pt_regs *regs, int *rctxp); | |
430ad5a6 XG |
599 | |
600 | static inline void | |
97d5a220 | 601 | perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr, |
e6dab5ff AV |
602 | u64 count, struct pt_regs *regs, void *head, |
603 | struct task_struct *task) | |
430ad5a6 | 604 | { |
e6dab5ff | 605 | perf_tp_event(addr, count, raw_data, size, regs, head, rctx, task); |
430ad5a6 | 606 | } |
6fb2915d LZ |
607 | #endif |
608 | ||
97f20251 | 609 | #endif /* _LINUX_FTRACE_EVENT_H */ |