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 | ||
6ea22486 DM |
47 | const char *ftrace_print_array_seq(struct trace_seq *p, |
48 | const void *buf, int buf_len, | |
49 | size_t el_size); | |
50 | ||
f71130de LZ |
51 | struct trace_iterator; |
52 | struct trace_event; | |
53 | ||
54 | int ftrace_raw_output_prep(struct trace_iterator *iter, | |
55 | struct trace_event *event); | |
56 | ||
97f20251 SR |
57 | /* |
58 | * The trace entry - the most basic unit of tracing. This is what | |
59 | * is printed in the end as a single line in the trace output, such as: | |
60 | * | |
61 | * bash-15816 [01] 235.197585: idle_cpu <- irq_enter | |
62 | */ | |
63 | struct trace_entry { | |
89ec0dee | 64 | unsigned short type; |
97f20251 SR |
65 | unsigned char flags; |
66 | unsigned char preempt_count; | |
67 | int pid; | |
97f20251 SR |
68 | }; |
69 | ||
89ec0dee SR |
70 | #define FTRACE_MAX_EVENT \ |
71 | ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1) | |
72 | ||
97f20251 SR |
73 | /* |
74 | * Trace iterator - used by printout routines who present trace | |
75 | * results to users and which routines might sleep, etc: | |
76 | */ | |
77 | struct trace_iterator { | |
78 | struct trace_array *tr; | |
79 | struct tracer *trace; | |
12883efb | 80 | struct trace_buffer *trace_buffer; |
97f20251 SR |
81 | void *private; |
82 | int cpu_file; | |
83 | struct mutex mutex; | |
6d158a81 | 84 | struct ring_buffer_iter **buffer_iter; |
112f38a7 | 85 | unsigned long iter_flags; |
97f20251 | 86 | |
bc289ae9 LJ |
87 | /* trace_seq for __print_flags() and __print_symbolic() etc. */ |
88 | struct trace_seq tmp_seq; | |
89 | ||
ed5467da AV |
90 | cpumask_var_t started; |
91 | ||
92 | /* it's true when current open file is snapshot */ | |
93 | bool snapshot; | |
94 | ||
97f20251 SR |
95 | /* The below is zeroed out in pipe_read */ |
96 | struct trace_seq seq; | |
97 | struct trace_entry *ent; | |
bc21b478 | 98 | unsigned long lost_events; |
a63ce5b3 | 99 | int leftover; |
4a9bd3f1 | 100 | int ent_size; |
97f20251 SR |
101 | int cpu; |
102 | u64 ts; | |
103 | ||
97f20251 SR |
104 | loff_t pos; |
105 | long idx; | |
106 | ||
ed5467da | 107 | /* All new field here will be zeroed out in pipe_read */ |
97f20251 SR |
108 | }; |
109 | ||
8be0709f DS |
110 | enum trace_iter_flags { |
111 | TRACE_FILE_LAT_FMT = 1, | |
112 | TRACE_FILE_ANNOTATE = 2, | |
113 | TRACE_FILE_TIME_IN_NS = 4, | |
114 | }; | |
115 | ||
97f20251 SR |
116 | |
117 | typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter, | |
a9a57763 SR |
118 | int flags, struct trace_event *event); |
119 | ||
120 | struct trace_event_functions { | |
97f20251 SR |
121 | trace_print_func trace; |
122 | trace_print_func raw; | |
123 | trace_print_func hex; | |
124 | trace_print_func binary; | |
125 | }; | |
126 | ||
a9a57763 SR |
127 | struct trace_event { |
128 | struct hlist_node node; | |
129 | struct list_head list; | |
130 | int type; | |
131 | struct trace_event_functions *funcs; | |
132 | }; | |
133 | ||
97f20251 SR |
134 | extern int register_ftrace_event(struct trace_event *event); |
135 | extern int unregister_ftrace_event(struct trace_event *event); | |
136 | ||
137 | /* Return values for print_line callback */ | |
138 | enum print_line_t { | |
139 | TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */ | |
140 | TRACE_TYPE_HANDLED = 1, | |
141 | TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */ | |
142 | TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */ | |
143 | }; | |
144 | ||
19a7fe20 SRRH |
145 | /* |
146 | * Several functions return TRACE_TYPE_PARTIAL_LINE if the trace_seq | |
147 | * overflowed, and TRACE_TYPE_HANDLED otherwise. This helper function | |
148 | * simplifies those functions and keeps them in sync. | |
149 | */ | |
150 | static inline enum print_line_t trace_handle_return(struct trace_seq *s) | |
151 | { | |
152 | return trace_seq_has_overflowed(s) ? | |
153 | TRACE_TYPE_PARTIAL_LINE : TRACE_TYPE_HANDLED; | |
154 | } | |
155 | ||
f413cdb8 FW |
156 | void tracing_generic_entry_update(struct trace_entry *entry, |
157 | unsigned long flags, | |
158 | int pc); | |
ccb469a1 SR |
159 | struct ftrace_event_file; |
160 | ||
161 | struct ring_buffer_event * | |
162 | trace_event_buffer_lock_reserve(struct ring_buffer **current_buffer, | |
163 | struct ftrace_event_file *ftrace_file, | |
164 | int type, unsigned long len, | |
165 | unsigned long flags, int pc); | |
97f20251 | 166 | struct ring_buffer_event * |
e77405ad SR |
167 | trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer, |
168 | int type, unsigned long len, | |
97f20251 | 169 | unsigned long flags, int pc); |
e77405ad SR |
170 | void trace_current_buffer_unlock_commit(struct ring_buffer *buffer, |
171 | struct ring_buffer_event *event, | |
97f20251 | 172 | unsigned long flags, int pc); |
0d5c6e1c SR |
173 | void trace_buffer_unlock_commit(struct ring_buffer *buffer, |
174 | struct ring_buffer_event *event, | |
175 | unsigned long flags, int pc); | |
176 | void trace_buffer_unlock_commit_regs(struct ring_buffer *buffer, | |
177 | struct ring_buffer_event *event, | |
178 | unsigned long flags, int pc, | |
179 | struct pt_regs *regs); | |
e77405ad SR |
180 | void trace_current_buffer_discard_commit(struct ring_buffer *buffer, |
181 | struct ring_buffer_event *event); | |
97f20251 SR |
182 | |
183 | void tracing_record_cmdline(struct task_struct *tsk); | |
184 | ||
1d6bae96 SR |
185 | int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...); |
186 | ||
1f9963cb LZ |
187 | struct event_filter; |
188 | ||
2239291a SR |
189 | enum trace_reg { |
190 | TRACE_REG_REGISTER, | |
191 | TRACE_REG_UNREGISTER, | |
37d73998 | 192 | #ifdef CONFIG_PERF_EVENTS |
2239291a SR |
193 | TRACE_REG_PERF_REGISTER, |
194 | TRACE_REG_PERF_UNREGISTER, | |
ceec0b6f JO |
195 | TRACE_REG_PERF_OPEN, |
196 | TRACE_REG_PERF_CLOSE, | |
489c75c3 JO |
197 | TRACE_REG_PERF_ADD, |
198 | TRACE_REG_PERF_DEL, | |
37d73998 | 199 | #endif |
2239291a SR |
200 | }; |
201 | ||
202 | struct ftrace_event_call; | |
203 | ||
8f082018 SR |
204 | struct ftrace_event_class { |
205 | char *system; | |
2239291a SR |
206 | void *probe; |
207 | #ifdef CONFIG_PERF_EVENTS | |
208 | void *perf_probe; | |
209 | #endif | |
210 | int (*reg)(struct ftrace_event_call *event, | |
ceec0b6f | 211 | enum trace_reg type, void *data); |
2e33af02 SR |
212 | int (*define_fields)(struct ftrace_event_call *); |
213 | struct list_head *(*get_fields)(struct ftrace_event_call *); | |
214 | struct list_head fields; | |
0405ab80 | 215 | int (*raw_init)(struct ftrace_event_call *); |
8f082018 SR |
216 | }; |
217 | ||
a1d0ce82 | 218 | extern int ftrace_event_reg(struct ftrace_event_call *event, |
ceec0b6f | 219 | enum trace_reg type, void *data); |
a1d0ce82 | 220 | |
1d6bae96 SR |
221 | int ftrace_output_event(struct trace_iterator *iter, struct ftrace_event_call *event, |
222 | char *fmt, ...); | |
223 | ||
35bb4399 SR |
224 | int ftrace_event_define_field(struct ftrace_event_call *call, |
225 | char *type, int len, char *item, int offset, | |
226 | int field_size, int sign, int filter); | |
227 | ||
3fd40d1e SR |
228 | struct ftrace_event_buffer { |
229 | struct ring_buffer *buffer; | |
230 | struct ring_buffer_event *event; | |
231 | struct ftrace_event_file *ftrace_file; | |
232 | void *entry; | |
233 | unsigned long flags; | |
234 | int pc; | |
235 | }; | |
236 | ||
237 | void *ftrace_event_buffer_reserve(struct ftrace_event_buffer *fbuffer, | |
238 | struct ftrace_event_file *ftrace_file, | |
239 | unsigned long len); | |
240 | ||
241 | void ftrace_event_buffer_commit(struct ftrace_event_buffer *fbuffer); | |
242 | ||
bc4c426e SRRH |
243 | int ftrace_event_define_field(struct ftrace_event_call *call, |
244 | char *type, int len, char *item, int offset, | |
245 | int field_size, int sign, int filter); | |
246 | ||
553552ce | 247 | enum { |
553552ce | 248 | TRACE_EVENT_FL_FILTERED_BIT, |
61c32659 | 249 | TRACE_EVENT_FL_CAP_ANY_BIT, |
27b14b56 | 250 | TRACE_EVENT_FL_NO_SET_FILTER_BIT, |
9b63776f | 251 | TRACE_EVENT_FL_IGNORE_ENABLE_BIT, |
575380da | 252 | TRACE_EVENT_FL_WAS_ENABLED_BIT, |
f306cc82 | 253 | TRACE_EVENT_FL_USE_CALL_FILTER_BIT, |
de7b2973 | 254 | TRACE_EVENT_FL_TRACEPOINT_BIT, |
553552ce SR |
255 | }; |
256 | ||
ae63b31e SR |
257 | /* |
258 | * Event flags: | |
259 | * FILTERED - The event has a filter attached | |
260 | * CAP_ANY - Any user can enable for perf | |
261 | * NO_SET_FILTER - Set when filter has error and is to be ignored | |
2a30c11f | 262 | * IGNORE_ENABLE - For ftrace internal events, do not enable with debugfs file |
575380da SRRH |
263 | * WAS_ENABLED - Set and stays set when an event was ever enabled |
264 | * (used for module unloading, if a module event is enabled, | |
265 | * it is best to clear the buffers that used it). | |
f306cc82 | 266 | * USE_CALL_FILTER - For ftrace internal events, don't use file filter |
de7b2973 | 267 | * TRACEPOINT - Event is a tracepoint |
ae63b31e | 268 | */ |
553552ce | 269 | enum { |
e870e9a1 | 270 | TRACE_EVENT_FL_FILTERED = (1 << TRACE_EVENT_FL_FILTERED_BIT), |
61c32659 | 271 | TRACE_EVENT_FL_CAP_ANY = (1 << TRACE_EVENT_FL_CAP_ANY_BIT), |
27b14b56 | 272 | TRACE_EVENT_FL_NO_SET_FILTER = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT), |
9b63776f | 273 | TRACE_EVENT_FL_IGNORE_ENABLE = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT), |
575380da | 274 | TRACE_EVENT_FL_WAS_ENABLED = (1 << TRACE_EVENT_FL_WAS_ENABLED_BIT), |
f306cc82 | 275 | TRACE_EVENT_FL_USE_CALL_FILTER = (1 << TRACE_EVENT_FL_USE_CALL_FILTER_BIT), |
de7b2973 | 276 | TRACE_EVENT_FL_TRACEPOINT = (1 << TRACE_EVENT_FL_TRACEPOINT_BIT), |
553552ce SR |
277 | }; |
278 | ||
97f20251 | 279 | struct ftrace_event_call { |
a59fd602 | 280 | struct list_head list; |
8f082018 | 281 | struct ftrace_event_class *class; |
de7b2973 MD |
282 | union { |
283 | char *name; | |
284 | /* Set TRACE_EVENT_FL_TRACEPOINT flag when using "tp" */ | |
285 | struct tracepoint *tp; | |
286 | }; | |
80decc70 | 287 | struct trace_event event; |
509e760c | 288 | const char *print_fmt; |
1f9963cb | 289 | struct event_filter *filter; |
6d723736 | 290 | void *mod; |
69fd4f0e | 291 | void *data; |
57d01ad0 SRRH |
292 | /* |
293 | * bit 0: filter_active | |
294 | * bit 1: allow trace by non root (cap any) | |
295 | * bit 2: failed to apply filter | |
296 | * bit 3: ftrace internal event (do not enable) | |
297 | * bit 4: Event was enabled by module | |
f306cc82 | 298 | * bit 5: use call filter rather than file filter |
de7b2973 | 299 | * bit 6: Event is a tracepoint |
57d01ad0 | 300 | */ |
ae63b31e SR |
301 | int flags; /* static flags of different events */ |
302 | ||
303 | #ifdef CONFIG_PERF_EVENTS | |
304 | int perf_refcount; | |
305 | struct hlist_head __percpu *perf_events; | |
d5b5f391 PZ |
306 | |
307 | int (*perf_perm)(struct ftrace_event_call *, | |
308 | struct perf_event *); | |
ae63b31e SR |
309 | #endif |
310 | }; | |
311 | ||
de7b2973 MD |
312 | static inline const char * |
313 | ftrace_event_name(struct ftrace_event_call *call) | |
314 | { | |
315 | if (call->flags & TRACE_EVENT_FL_TRACEPOINT) | |
316 | return call->tp ? call->tp->name : NULL; | |
317 | else | |
318 | return call->name; | |
319 | } | |
320 | ||
ae63b31e SR |
321 | struct trace_array; |
322 | struct ftrace_subsystem_dir; | |
323 | ||
324 | enum { | |
325 | FTRACE_EVENT_FL_ENABLED_BIT, | |
326 | FTRACE_EVENT_FL_RECORDED_CMD_BIT, | |
f306cc82 TZ |
327 | FTRACE_EVENT_FL_FILTERED_BIT, |
328 | FTRACE_EVENT_FL_NO_SET_FILTER_BIT, | |
417944c4 SRRH |
329 | FTRACE_EVENT_FL_SOFT_MODE_BIT, |
330 | FTRACE_EVENT_FL_SOFT_DISABLED_BIT, | |
85f2b082 | 331 | FTRACE_EVENT_FL_TRIGGER_MODE_BIT, |
bac5fb97 | 332 | FTRACE_EVENT_FL_TRIGGER_COND_BIT, |
ae63b31e SR |
333 | }; |
334 | ||
335 | /* | |
336 | * Ftrace event file flags: | |
57d01ad0 | 337 | * ENABLED - The event is enabled |
ae63b31e | 338 | * RECORDED_CMD - The comms should be recorded at sched_switch |
f306cc82 TZ |
339 | * FILTERED - The event has a filter attached |
340 | * NO_SET_FILTER - Set when filter has error and is to be ignored | |
417944c4 SRRH |
341 | * SOFT_MODE - The event is enabled/disabled by SOFT_DISABLED |
342 | * SOFT_DISABLED - When set, do not trace the event (even though its | |
343 | * tracepoint may be enabled) | |
85f2b082 | 344 | * TRIGGER_MODE - When set, invoke the triggers associated with the event |
bac5fb97 | 345 | * TRIGGER_COND - When set, one or more triggers has an associated filter |
ae63b31e SR |
346 | */ |
347 | enum { | |
348 | FTRACE_EVENT_FL_ENABLED = (1 << FTRACE_EVENT_FL_ENABLED_BIT), | |
349 | FTRACE_EVENT_FL_RECORDED_CMD = (1 << FTRACE_EVENT_FL_RECORDED_CMD_BIT), | |
f306cc82 TZ |
350 | FTRACE_EVENT_FL_FILTERED = (1 << FTRACE_EVENT_FL_FILTERED_BIT), |
351 | FTRACE_EVENT_FL_NO_SET_FILTER = (1 << FTRACE_EVENT_FL_NO_SET_FILTER_BIT), | |
417944c4 SRRH |
352 | FTRACE_EVENT_FL_SOFT_MODE = (1 << FTRACE_EVENT_FL_SOFT_MODE_BIT), |
353 | FTRACE_EVENT_FL_SOFT_DISABLED = (1 << FTRACE_EVENT_FL_SOFT_DISABLED_BIT), | |
85f2b082 | 354 | FTRACE_EVENT_FL_TRIGGER_MODE = (1 << FTRACE_EVENT_FL_TRIGGER_MODE_BIT), |
bac5fb97 | 355 | FTRACE_EVENT_FL_TRIGGER_COND = (1 << FTRACE_EVENT_FL_TRIGGER_COND_BIT), |
ae63b31e SR |
356 | }; |
357 | ||
358 | struct ftrace_event_file { | |
359 | struct list_head list; | |
360 | struct ftrace_event_call *event_call; | |
f306cc82 | 361 | struct event_filter *filter; |
ae63b31e SR |
362 | struct dentry *dir; |
363 | struct trace_array *tr; | |
364 | struct ftrace_subsystem_dir *system; | |
85f2b082 | 365 | struct list_head triggers; |
97f20251 | 366 | |
553552ce SR |
367 | /* |
368 | * 32 bit flags: | |
57d01ad0 SRRH |
369 | * bit 0: enabled |
370 | * bit 1: enabled cmd record | |
417944c4 SRRH |
371 | * bit 2: enable/disable with the soft disable bit |
372 | * bit 3: soft disabled | |
85f2b082 | 373 | * bit 4: trigger enabled |
553552ce | 374 | * |
417944c4 SRRH |
375 | * Note: The bits must be set atomically to prevent races |
376 | * from other writers. Reads of flags do not need to be in | |
377 | * sync as they occur in critical sections. But the way flags | |
ae63b31e | 378 | * is currently used, these changes do not affect the code |
1eaa4787 SR |
379 | * except that when a change is made, it may have a slight |
380 | * delay in propagating the changes to other CPUs due to | |
417944c4 | 381 | * caching and such. Which is mostly OK ;-) |
553552ce | 382 | */ |
417944c4 | 383 | unsigned long flags; |
1cf4c073 | 384 | atomic_t sm_ref; /* soft-mode reference counter */ |
85f2b082 | 385 | atomic_t tm_ref; /* trigger-mode reference counter */ |
97f20251 SR |
386 | }; |
387 | ||
53cf810b FW |
388 | #define __TRACE_EVENT_FLAGS(name, value) \ |
389 | static int __init trace_init_flags_##name(void) \ | |
390 | { \ | |
de7b2973 | 391 | event_##name.flags |= value; \ |
53cf810b FW |
392 | return 0; \ |
393 | } \ | |
394 | early_initcall(trace_init_flags_##name); | |
395 | ||
d5b5f391 PZ |
396 | #define __TRACE_EVENT_PERF_PERM(name, expr...) \ |
397 | static int perf_perm_##name(struct ftrace_event_call *tp_event, \ | |
398 | struct perf_event *p_event) \ | |
399 | { \ | |
400 | return ({ expr; }); \ | |
401 | } \ | |
402 | static int __init trace_init_perf_perm_##name(void) \ | |
403 | { \ | |
404 | event_##name.perf_perm = &perf_perm_##name; \ | |
405 | return 0; \ | |
406 | } \ | |
407 | early_initcall(trace_init_perf_perm_##name); | |
408 | ||
97d5a220 | 409 | #define PERF_MAX_TRACE_SIZE 2048 |
20ab4425 | 410 | |
16bb8eb1 | 411 | #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */ |
97f20251 | 412 | |
85f2b082 TZ |
413 | enum event_trigger_type { |
414 | ETT_NONE = (0), | |
2a2df321 | 415 | ETT_TRACE_ONOFF = (1 << 0), |
93e31ffb | 416 | ETT_SNAPSHOT = (1 << 1), |
f21ecbb3 | 417 | ETT_STACKTRACE = (1 << 2), |
7862ad18 | 418 | ETT_EVENT_ENABLE = (1 << 3), |
85f2b082 TZ |
419 | }; |
420 | ||
6fb2915d | 421 | extern int filter_match_preds(struct event_filter *filter, void *rec); |
f306cc82 TZ |
422 | |
423 | extern int filter_check_discard(struct ftrace_event_file *file, void *rec, | |
424 | struct ring_buffer *buffer, | |
425 | struct ring_buffer_event *event); | |
426 | extern int call_filter_check_discard(struct ftrace_event_call *call, void *rec, | |
427 | struct ring_buffer *buffer, | |
428 | struct ring_buffer_event *event); | |
bac5fb97 TZ |
429 | extern enum event_trigger_type event_triggers_call(struct ftrace_event_file *file, |
430 | void *rec); | |
431 | extern void event_triggers_post_call(struct ftrace_event_file *file, | |
432 | enum event_trigger_type tt); | |
97f20251 | 433 | |
13a1e4ae SRRH |
434 | /** |
435 | * ftrace_trigger_soft_disabled - do triggers and test if soft disabled | |
436 | * @file: The file pointer of the event to test | |
437 | * | |
438 | * If any triggers without filters are attached to this event, they | |
439 | * will be called here. If the event is soft disabled and has no | |
440 | * triggers that require testing the fields, it will return true, | |
441 | * otherwise false. | |
442 | */ | |
443 | static inline bool | |
444 | ftrace_trigger_soft_disabled(struct ftrace_event_file *file) | |
445 | { | |
446 | unsigned long eflags = file->flags; | |
447 | ||
448 | if (!(eflags & FTRACE_EVENT_FL_TRIGGER_COND)) { | |
449 | if (eflags & FTRACE_EVENT_FL_TRIGGER_MODE) | |
450 | event_triggers_call(file, NULL); | |
451 | if (eflags & FTRACE_EVENT_FL_SOFT_DISABLED) | |
452 | return true; | |
453 | } | |
454 | return false; | |
455 | } | |
456 | ||
457 | /* | |
458 | * Helper function for event_trigger_unlock_commit{_regs}(). | |
459 | * If there are event triggers attached to this event that requires | |
460 | * filtering against its fields, then they wil be called as the | |
461 | * entry already holds the field information of the current event. | |
462 | * | |
463 | * It also checks if the event should be discarded or not. | |
464 | * It is to be discarded if the event is soft disabled and the | |
465 | * event was only recorded to process triggers, or if the event | |
466 | * filter is active and this event did not match the filters. | |
467 | * | |
468 | * Returns true if the event is discarded, false otherwise. | |
469 | */ | |
470 | static inline bool | |
471 | __event_trigger_test_discard(struct ftrace_event_file *file, | |
472 | struct ring_buffer *buffer, | |
473 | struct ring_buffer_event *event, | |
474 | void *entry, | |
475 | enum event_trigger_type *tt) | |
476 | { | |
477 | unsigned long eflags = file->flags; | |
478 | ||
479 | if (eflags & FTRACE_EVENT_FL_TRIGGER_COND) | |
480 | *tt = event_triggers_call(file, entry); | |
481 | ||
482 | if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &file->flags)) | |
483 | ring_buffer_discard_commit(buffer, event); | |
484 | else if (!filter_check_discard(file, entry, buffer, event)) | |
485 | return false; | |
486 | ||
487 | return true; | |
488 | } | |
489 | ||
490 | /** | |
491 | * event_trigger_unlock_commit - handle triggers and finish event commit | |
492 | * @file: The file pointer assoctiated to the event | |
493 | * @buffer: The ring buffer that the event is being written to | |
494 | * @event: The event meta data in the ring buffer | |
495 | * @entry: The event itself | |
496 | * @irq_flags: The state of the interrupts at the start of the event | |
497 | * @pc: The state of the preempt count at the start of the event. | |
498 | * | |
499 | * This is a helper function to handle triggers that require data | |
500 | * from the event itself. It also tests the event against filters and | |
501 | * if the event is soft disabled and should be discarded. | |
502 | */ | |
503 | static inline void | |
504 | event_trigger_unlock_commit(struct ftrace_event_file *file, | |
505 | struct ring_buffer *buffer, | |
506 | struct ring_buffer_event *event, | |
507 | void *entry, unsigned long irq_flags, int pc) | |
508 | { | |
509 | enum event_trigger_type tt = ETT_NONE; | |
510 | ||
511 | if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) | |
512 | trace_buffer_unlock_commit(buffer, event, irq_flags, pc); | |
513 | ||
514 | if (tt) | |
515 | event_triggers_post_call(file, tt); | |
516 | } | |
517 | ||
518 | /** | |
519 | * event_trigger_unlock_commit_regs - handle triggers and finish event commit | |
520 | * @file: The file pointer assoctiated to the event | |
521 | * @buffer: The ring buffer that the event is being written to | |
522 | * @event: The event meta data in the ring buffer | |
523 | * @entry: The event itself | |
524 | * @irq_flags: The state of the interrupts at the start of the event | |
525 | * @pc: The state of the preempt count at the start of the event. | |
526 | * | |
527 | * This is a helper function to handle triggers that require data | |
528 | * from the event itself. It also tests the event against filters and | |
529 | * if the event is soft disabled and should be discarded. | |
530 | * | |
531 | * Same as event_trigger_unlock_commit() but calls | |
532 | * trace_buffer_unlock_commit_regs() instead of trace_buffer_unlock_commit(). | |
533 | */ | |
534 | static inline void | |
535 | event_trigger_unlock_commit_regs(struct ftrace_event_file *file, | |
536 | struct ring_buffer *buffer, | |
537 | struct ring_buffer_event *event, | |
538 | void *entry, unsigned long irq_flags, int pc, | |
539 | struct pt_regs *regs) | |
540 | { | |
541 | enum event_trigger_type tt = ETT_NONE; | |
542 | ||
543 | if (!__event_trigger_test_discard(file, buffer, event, entry, &tt)) | |
544 | trace_buffer_unlock_commit_regs(buffer, event, | |
545 | irq_flags, pc, regs); | |
546 | ||
547 | if (tt) | |
548 | event_triggers_post_call(file, tt); | |
549 | } | |
550 | ||
43b51ead LZ |
551 | enum { |
552 | FILTER_OTHER = 0, | |
553 | FILTER_STATIC_STRING, | |
554 | FILTER_DYN_STRING, | |
87a342f5 | 555 | FILTER_PTR_STRING, |
02aa3162 | 556 | FILTER_TRACE_FN, |
43b51ead LZ |
557 | }; |
558 | ||
87d9b4e1 | 559 | extern int trace_event_raw_init(struct ftrace_event_call *call); |
aeaeae11 FW |
560 | extern int trace_define_field(struct ftrace_event_call *call, const char *type, |
561 | const char *name, int offset, int size, | |
562 | int is_signed, int filter_type); | |
bd1a5c84 | 563 | extern int trace_add_event_call(struct ftrace_event_call *call); |
2816c551 | 564 | extern int trace_remove_event_call(struct ftrace_event_call *call); |
97f20251 | 565 | |
d2802d07 | 566 | #define is_signed_type(type) (((type)(-1)) < (type)1) |
97f20251 | 567 | |
4671c794 SR |
568 | int trace_set_clr_event(const char *system, const char *event, int set); |
569 | ||
97f20251 SR |
570 | /* |
571 | * The double __builtin_constant_p is because gcc will give us an error | |
572 | * if we try to allocate the static variable to fmt if it is not a | |
573 | * constant. Even with the outer if statement optimizing out. | |
574 | */ | |
575 | #define event_trace_printk(ip, fmt, args...) \ | |
576 | do { \ | |
577 | __trace_printk_check_format(fmt, ##args); \ | |
578 | tracing_record_cmdline(current); \ | |
579 | if (__builtin_constant_p(fmt)) { \ | |
580 | static const char *trace_printk_fmt \ | |
581 | __attribute__((section("__trace_printk_fmt"))) = \ | |
582 | __builtin_constant_p(fmt) ? fmt : NULL; \ | |
583 | \ | |
584 | __trace_bprintk(ip, trace_printk_fmt, ##args); \ | |
585 | } else \ | |
586 | __trace_printk(ip, fmt, ##args); \ | |
587 | } while (0) | |
588 | ||
07b139c8 | 589 | #ifdef CONFIG_PERF_EVENTS |
6fb2915d | 590 | struct perf_event; |
c530665c FW |
591 | |
592 | DECLARE_PER_CPU(struct pt_regs, perf_trace_regs); | |
593 | ||
1c024eca PZ |
594 | extern int perf_trace_init(struct perf_event *event); |
595 | extern void perf_trace_destroy(struct perf_event *event); | |
a4eaf7f1 PZ |
596 | extern int perf_trace_add(struct perf_event *event, int flags); |
597 | extern void perf_trace_del(struct perf_event *event, int flags); | |
1c024eca | 598 | extern int ftrace_profile_set_filter(struct perf_event *event, int event_id, |
6fb2915d LZ |
599 | char *filter_str); |
600 | extern void ftrace_profile_free_filter(struct perf_event *event); | |
b7e2ecef | 601 | extern void *perf_trace_buf_prepare(int size, unsigned short type, |
86038c5e | 602 | struct pt_regs **regs, int *rctxp); |
430ad5a6 XG |
603 | |
604 | static inline void | |
97d5a220 | 605 | perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr, |
e6dab5ff AV |
606 | u64 count, struct pt_regs *regs, void *head, |
607 | struct task_struct *task) | |
430ad5a6 | 608 | { |
e6dab5ff | 609 | perf_tp_event(addr, count, raw_data, size, regs, head, rctx, task); |
430ad5a6 | 610 | } |
6fb2915d LZ |
611 | #endif |
612 | ||
97f20251 | 613 | #endif /* _LINUX_FTRACE_EVENT_H */ |