Line data Source code
1 : /* SPDX-License-Identifier: GPL-2.0 */
2 :
3 : #ifndef _LINUX_TRACE_EVENT_H
4 : #define _LINUX_TRACE_EVENT_H
5 :
6 : #include <linux/ring_buffer.h>
7 : #include <linux/trace_seq.h>
8 : #include <linux/percpu.h>
9 : #include <linux/hardirq.h>
10 : #include <linux/perf_event.h>
11 : #include <linux/tracepoint.h>
12 :
13 : struct trace_array;
14 : struct array_buffer;
15 : struct tracer;
16 : struct dentry;
17 : struct bpf_prog;
18 :
19 : const char *trace_print_flags_seq(struct trace_seq *p, const char *delim,
20 : unsigned long flags,
21 : const struct trace_print_flags *flag_array);
22 :
23 : const char *trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
24 : const struct trace_print_flags *symbol_array);
25 :
26 : #if BITS_PER_LONG == 32
27 : const char *trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
28 : unsigned long long flags,
29 : const struct trace_print_flags_u64 *flag_array);
30 :
31 : const char *trace_print_symbols_seq_u64(struct trace_seq *p,
32 : unsigned long long val,
33 : const struct trace_print_flags_u64
34 : *symbol_array);
35 : #endif
36 :
37 : const char *trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
38 : unsigned int bitmask_size);
39 :
40 : const char *trace_print_hex_seq(struct trace_seq *p,
41 : const unsigned char *buf, int len,
42 : bool concatenate);
43 :
44 : const char *trace_print_array_seq(struct trace_seq *p,
45 : const void *buf, int count,
46 : size_t el_size);
47 :
48 : const char *
49 : trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
50 : int prefix_type, int rowsize, int groupsize,
51 : const void *buf, size_t len, bool ascii);
52 :
53 : struct trace_iterator;
54 : struct trace_event;
55 :
56 : int trace_raw_output_prep(struct trace_iterator *iter,
57 : struct trace_event *event);
58 : extern __printf(2, 3)
59 : void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...);
60 :
61 : /*
62 : * The trace entry - the most basic unit of tracing. This is what
63 : * is printed in the end as a single line in the trace output, such as:
64 : *
65 : * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
66 : */
67 : struct trace_entry {
68 : unsigned short type;
69 : unsigned char flags;
70 : unsigned char preempt_count;
71 : int pid;
72 : };
73 :
74 : #define TRACE_EVENT_TYPE_MAX \
75 : ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
76 :
77 : /*
78 : * Trace iterator - used by printout routines who present trace
79 : * results to users and which routines might sleep, etc:
80 : */
81 : struct trace_iterator {
82 : struct trace_array *tr;
83 : struct tracer *trace;
84 : struct array_buffer *array_buffer;
85 : void *private;
86 : int cpu_file;
87 : struct mutex mutex;
88 : struct ring_buffer_iter **buffer_iter;
89 : unsigned long iter_flags;
90 : void *temp; /* temp holder */
91 : unsigned int temp_size;
92 : char *fmt; /* modified format holder */
93 : unsigned int fmt_size;
94 :
95 : /* trace_seq for __print_flags() and __print_symbolic() etc. */
96 : struct trace_seq tmp_seq;
97 :
98 : cpumask_var_t started;
99 :
100 : /* it's true when current open file is snapshot */
101 : bool snapshot;
102 :
103 : /* The below is zeroed out in pipe_read */
104 : struct trace_seq seq;
105 : struct trace_entry *ent;
106 : unsigned long lost_events;
107 : int leftover;
108 : int ent_size;
109 : int cpu;
110 : u64 ts;
111 :
112 : loff_t pos;
113 : long idx;
114 :
115 : /* All new field here will be zeroed out in pipe_read */
116 : };
117 :
118 : enum trace_iter_flags {
119 : TRACE_FILE_LAT_FMT = 1,
120 : TRACE_FILE_ANNOTATE = 2,
121 : TRACE_FILE_TIME_IN_NS = 4,
122 : };
123 :
124 :
125 : typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
126 : int flags, struct trace_event *event);
127 :
128 : struct trace_event_functions {
129 : trace_print_func trace;
130 : trace_print_func raw;
131 : trace_print_func hex;
132 : trace_print_func binary;
133 : };
134 :
135 : struct trace_event {
136 : struct hlist_node node;
137 : struct list_head list;
138 : int type;
139 : struct trace_event_functions *funcs;
140 : };
141 :
142 : extern int register_trace_event(struct trace_event *event);
143 : extern int unregister_trace_event(struct trace_event *event);
144 :
145 : /* Return values for print_line callback */
146 : enum print_line_t {
147 : TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
148 : TRACE_TYPE_HANDLED = 1,
149 : TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
150 : TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
151 : };
152 :
153 : enum print_line_t trace_handle_return(struct trace_seq *s);
154 :
155 0 : static inline void tracing_generic_entry_update(struct trace_entry *entry,
156 : unsigned short type,
157 : unsigned int trace_ctx)
158 : {
159 0 : entry->preempt_count = trace_ctx & 0xff;
160 0 : entry->pid = current->pid;
161 0 : entry->type = type;
162 0 : entry->flags = trace_ctx >> 16;
163 0 : }
164 :
165 : unsigned int tracing_gen_ctx_irq_test(unsigned int irqs_status);
166 :
167 : enum trace_flag_type {
168 : TRACE_FLAG_IRQS_OFF = 0x01,
169 : TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
170 : TRACE_FLAG_NEED_RESCHED = 0x04,
171 : TRACE_FLAG_HARDIRQ = 0x08,
172 : TRACE_FLAG_SOFTIRQ = 0x10,
173 : TRACE_FLAG_PREEMPT_RESCHED = 0x20,
174 : TRACE_FLAG_NMI = 0x40,
175 : };
176 :
177 : #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
178 0 : static inline unsigned int tracing_gen_ctx_flags(unsigned long irqflags)
179 : {
180 0 : unsigned int irq_status = irqs_disabled_flags(irqflags) ?
181 : TRACE_FLAG_IRQS_OFF : 0;
182 0 : return tracing_gen_ctx_irq_test(irq_status);
183 : }
184 0 : static inline unsigned int tracing_gen_ctx(void)
185 : {
186 0 : unsigned long irqflags;
187 :
188 0 : local_save_flags(irqflags);
189 0 : return tracing_gen_ctx_flags(irqflags);
190 : }
191 : #else
192 :
193 : static inline unsigned int tracing_gen_ctx_flags(unsigned long irqflags)
194 : {
195 : return tracing_gen_ctx_irq_test(TRACE_FLAG_IRQS_NOSUPPORT);
196 : }
197 : static inline unsigned int tracing_gen_ctx(void)
198 : {
199 : return tracing_gen_ctx_irq_test(TRACE_FLAG_IRQS_NOSUPPORT);
200 : }
201 : #endif
202 :
203 0 : static inline unsigned int tracing_gen_ctx_dec(void)
204 : {
205 0 : unsigned int trace_ctx;
206 :
207 0 : trace_ctx = tracing_gen_ctx();
208 : /*
209 : * Subtract one from the preeption counter if preemption is enabled,
210 : * see trace_event_buffer_reserve()for details.
211 : */
212 0 : if (IS_ENABLED(CONFIG_PREEMPTION))
213 : trace_ctx--;
214 0 : return trace_ctx;
215 : }
216 :
217 : struct trace_event_file;
218 :
219 : struct ring_buffer_event *
220 : trace_event_buffer_lock_reserve(struct trace_buffer **current_buffer,
221 : struct trace_event_file *trace_file,
222 : int type, unsigned long len,
223 : unsigned int trace_ctx);
224 :
225 : #define TRACE_RECORD_CMDLINE BIT(0)
226 : #define TRACE_RECORD_TGID BIT(1)
227 :
228 : void tracing_record_taskinfo(struct task_struct *task, int flags);
229 : void tracing_record_taskinfo_sched_switch(struct task_struct *prev,
230 : struct task_struct *next, int flags);
231 :
232 : void tracing_record_cmdline(struct task_struct *task);
233 : void tracing_record_tgid(struct task_struct *task);
234 :
235 : int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...);
236 :
237 : struct event_filter;
238 :
239 : enum trace_reg {
240 : TRACE_REG_REGISTER,
241 : TRACE_REG_UNREGISTER,
242 : #ifdef CONFIG_PERF_EVENTS
243 : TRACE_REG_PERF_REGISTER,
244 : TRACE_REG_PERF_UNREGISTER,
245 : TRACE_REG_PERF_OPEN,
246 : TRACE_REG_PERF_CLOSE,
247 : /*
248 : * These (ADD/DEL) use a 'boolean' return value, where 1 (true) means a
249 : * custom action was taken and the default action is not to be
250 : * performed.
251 : */
252 : TRACE_REG_PERF_ADD,
253 : TRACE_REG_PERF_DEL,
254 : #endif
255 : };
256 :
257 : struct trace_event_call;
258 :
259 : #define TRACE_FUNCTION_TYPE ((const char *)~0UL)
260 :
261 : struct trace_event_fields {
262 : const char *type;
263 : union {
264 : struct {
265 : const char *name;
266 : const int size;
267 : const int align;
268 : const int is_signed;
269 : const int filter_type;
270 : };
271 : int (*define_fields)(struct trace_event_call *);
272 : };
273 : };
274 :
275 : struct trace_event_class {
276 : const char *system;
277 : void *probe;
278 : #ifdef CONFIG_PERF_EVENTS
279 : void *perf_probe;
280 : #endif
281 : int (*reg)(struct trace_event_call *event,
282 : enum trace_reg type, void *data);
283 : struct trace_event_fields *fields_array;
284 : struct list_head *(*get_fields)(struct trace_event_call *);
285 : struct list_head fields;
286 : int (*raw_init)(struct trace_event_call *);
287 : };
288 :
289 : extern int trace_event_reg(struct trace_event_call *event,
290 : enum trace_reg type, void *data);
291 :
292 : struct trace_event_buffer {
293 : struct trace_buffer *buffer;
294 : struct ring_buffer_event *event;
295 : struct trace_event_file *trace_file;
296 : void *entry;
297 : unsigned int trace_ctx;
298 : struct pt_regs *regs;
299 : };
300 :
301 : void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer,
302 : struct trace_event_file *trace_file,
303 : unsigned long len);
304 :
305 : void trace_event_buffer_commit(struct trace_event_buffer *fbuffer);
306 :
307 : enum {
308 : TRACE_EVENT_FL_FILTERED_BIT,
309 : TRACE_EVENT_FL_CAP_ANY_BIT,
310 : TRACE_EVENT_FL_NO_SET_FILTER_BIT,
311 : TRACE_EVENT_FL_IGNORE_ENABLE_BIT,
312 : TRACE_EVENT_FL_TRACEPOINT_BIT,
313 : TRACE_EVENT_FL_KPROBE_BIT,
314 : TRACE_EVENT_FL_UPROBE_BIT,
315 : };
316 :
317 : /*
318 : * Event flags:
319 : * FILTERED - The event has a filter attached
320 : * CAP_ANY - Any user can enable for perf
321 : * NO_SET_FILTER - Set when filter has error and is to be ignored
322 : * IGNORE_ENABLE - For trace internal events, do not enable with debugfs file
323 : * TRACEPOINT - Event is a tracepoint
324 : * KPROBE - Event is a kprobe
325 : * UPROBE - Event is a uprobe
326 : */
327 : enum {
328 : TRACE_EVENT_FL_FILTERED = (1 << TRACE_EVENT_FL_FILTERED_BIT),
329 : TRACE_EVENT_FL_CAP_ANY = (1 << TRACE_EVENT_FL_CAP_ANY_BIT),
330 : TRACE_EVENT_FL_NO_SET_FILTER = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
331 : TRACE_EVENT_FL_IGNORE_ENABLE = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT),
332 : TRACE_EVENT_FL_TRACEPOINT = (1 << TRACE_EVENT_FL_TRACEPOINT_BIT),
333 : TRACE_EVENT_FL_KPROBE = (1 << TRACE_EVENT_FL_KPROBE_BIT),
334 : TRACE_EVENT_FL_UPROBE = (1 << TRACE_EVENT_FL_UPROBE_BIT),
335 : };
336 :
337 : #define TRACE_EVENT_FL_UKPROBE (TRACE_EVENT_FL_KPROBE | TRACE_EVENT_FL_UPROBE)
338 :
339 : struct trace_event_call {
340 : struct list_head list;
341 : struct trace_event_class *class;
342 : union {
343 : char *name;
344 : /* Set TRACE_EVENT_FL_TRACEPOINT flag when using "tp" */
345 : struct tracepoint *tp;
346 : };
347 : struct trace_event event;
348 : char *print_fmt;
349 : struct event_filter *filter;
350 : void *mod;
351 : void *data;
352 :
353 : /* See the TRACE_EVENT_FL_* flags above */
354 : int flags; /* static flags of different events */
355 :
356 : #ifdef CONFIG_PERF_EVENTS
357 : int perf_refcount;
358 : struct hlist_head __percpu *perf_events;
359 : struct bpf_prog_array __rcu *prog_array;
360 :
361 : int (*perf_perm)(struct trace_event_call *,
362 : struct perf_event *);
363 : #endif
364 : };
365 :
366 : #ifdef CONFIG_PERF_EVENTS
367 0 : static inline bool bpf_prog_array_valid(struct trace_event_call *call)
368 : {
369 : /*
370 : * This inline function checks whether call->prog_array
371 : * is valid or not. The function is called in various places,
372 : * outside rcu_read_lock/unlock, as a heuristic to speed up execution.
373 : *
374 : * If this function returns true, and later call->prog_array
375 : * becomes false inside rcu_read_lock/unlock region,
376 : * we bail out then. If this function return false,
377 : * there is a risk that we might miss a few events if the checking
378 : * were delayed until inside rcu_read_lock/unlock region and
379 : * call->prog_array happened to become non-NULL then.
380 : *
381 : * Here, READ_ONCE() is used instead of rcu_access_pointer().
382 : * rcu_access_pointer() requires the actual definition of
383 : * "struct bpf_prog_array" while READ_ONCE() only needs
384 : * a declaration of the same type.
385 : */
386 0 : return !!READ_ONCE(call->prog_array);
387 : }
388 : #endif
389 :
390 : static inline const char *
391 1226 : trace_event_name(struct trace_event_call *call)
392 : {
393 1226 : if (call->flags & TRACE_EVENT_FL_TRACEPOINT)
394 1189 : return call->tp ? call->tp->name : NULL;
395 : else
396 37 : return call->name;
397 : }
398 :
399 : static inline struct list_head *
400 2762 : trace_get_fields(struct trace_event_call *event_call)
401 : {
402 2762 : if (!event_call->class->get_fields)
403 2762 : return &event_call->class->fields;
404 0 : return event_call->class->get_fields(event_call);
405 : }
406 :
407 : struct trace_array;
408 : struct trace_subsystem_dir;
409 :
410 : enum {
411 : EVENT_FILE_FL_ENABLED_BIT,
412 : EVENT_FILE_FL_RECORDED_CMD_BIT,
413 : EVENT_FILE_FL_RECORDED_TGID_BIT,
414 : EVENT_FILE_FL_FILTERED_BIT,
415 : EVENT_FILE_FL_NO_SET_FILTER_BIT,
416 : EVENT_FILE_FL_SOFT_MODE_BIT,
417 : EVENT_FILE_FL_SOFT_DISABLED_BIT,
418 : EVENT_FILE_FL_TRIGGER_MODE_BIT,
419 : EVENT_FILE_FL_TRIGGER_COND_BIT,
420 : EVENT_FILE_FL_PID_FILTER_BIT,
421 : EVENT_FILE_FL_WAS_ENABLED_BIT,
422 : };
423 :
424 : extern struct trace_event_file *trace_get_event_file(const char *instance,
425 : const char *system,
426 : const char *event);
427 : extern void trace_put_event_file(struct trace_event_file *file);
428 :
429 : #define MAX_DYNEVENT_CMD_LEN (2048)
430 :
431 : enum dynevent_type {
432 : DYNEVENT_TYPE_SYNTH = 1,
433 : DYNEVENT_TYPE_KPROBE,
434 : DYNEVENT_TYPE_NONE,
435 : };
436 :
437 : struct dynevent_cmd;
438 :
439 : typedef int (*dynevent_create_fn_t)(struct dynevent_cmd *cmd);
440 :
441 : struct dynevent_cmd {
442 : struct seq_buf seq;
443 : const char *event_name;
444 : unsigned int n_fields;
445 : enum dynevent_type type;
446 : dynevent_create_fn_t run_command;
447 : void *private_data;
448 : };
449 :
450 : extern int dynevent_create(struct dynevent_cmd *cmd);
451 :
452 : extern int synth_event_delete(const char *name);
453 :
454 : extern void synth_event_cmd_init(struct dynevent_cmd *cmd,
455 : char *buf, int maxlen);
456 :
457 : extern int __synth_event_gen_cmd_start(struct dynevent_cmd *cmd,
458 : const char *name,
459 : struct module *mod, ...);
460 :
461 : #define synth_event_gen_cmd_start(cmd, name, mod, ...) \
462 : __synth_event_gen_cmd_start(cmd, name, mod, ## __VA_ARGS__, NULL)
463 :
464 : struct synth_field_desc {
465 : const char *type;
466 : const char *name;
467 : };
468 :
469 : extern int synth_event_gen_cmd_array_start(struct dynevent_cmd *cmd,
470 : const char *name,
471 : struct module *mod,
472 : struct synth_field_desc *fields,
473 : unsigned int n_fields);
474 : extern int synth_event_create(const char *name,
475 : struct synth_field_desc *fields,
476 : unsigned int n_fields, struct module *mod);
477 :
478 : extern int synth_event_add_field(struct dynevent_cmd *cmd,
479 : const char *type,
480 : const char *name);
481 : extern int synth_event_add_field_str(struct dynevent_cmd *cmd,
482 : const char *type_name);
483 : extern int synth_event_add_fields(struct dynevent_cmd *cmd,
484 : struct synth_field_desc *fields,
485 : unsigned int n_fields);
486 :
487 : #define synth_event_gen_cmd_end(cmd) \
488 : dynevent_create(cmd)
489 :
490 : struct synth_event;
491 :
492 : struct synth_event_trace_state {
493 : struct trace_event_buffer fbuffer;
494 : struct synth_trace_event *entry;
495 : struct trace_buffer *buffer;
496 : struct synth_event *event;
497 : unsigned int cur_field;
498 : unsigned int n_u64;
499 : bool disabled;
500 : bool add_next;
501 : bool add_name;
502 : };
503 :
504 : extern int synth_event_trace(struct trace_event_file *file,
505 : unsigned int n_vals, ...);
506 : extern int synth_event_trace_array(struct trace_event_file *file, u64 *vals,
507 : unsigned int n_vals);
508 : extern int synth_event_trace_start(struct trace_event_file *file,
509 : struct synth_event_trace_state *trace_state);
510 : extern int synth_event_add_next_val(u64 val,
511 : struct synth_event_trace_state *trace_state);
512 : extern int synth_event_add_val(const char *field_name, u64 val,
513 : struct synth_event_trace_state *trace_state);
514 : extern int synth_event_trace_end(struct synth_event_trace_state *trace_state);
515 :
516 : extern int kprobe_event_delete(const char *name);
517 :
518 : extern void kprobe_event_cmd_init(struct dynevent_cmd *cmd,
519 : char *buf, int maxlen);
520 :
521 : #define kprobe_event_gen_cmd_start(cmd, name, loc, ...) \
522 : __kprobe_event_gen_cmd_start(cmd, false, name, loc, ## __VA_ARGS__, NULL)
523 :
524 : #define kretprobe_event_gen_cmd_start(cmd, name, loc, ...) \
525 : __kprobe_event_gen_cmd_start(cmd, true, name, loc, ## __VA_ARGS__, NULL)
526 :
527 : extern int __kprobe_event_gen_cmd_start(struct dynevent_cmd *cmd,
528 : bool kretprobe,
529 : const char *name,
530 : const char *loc, ...);
531 :
532 : #define kprobe_event_add_fields(cmd, ...) \
533 : __kprobe_event_add_fields(cmd, ## __VA_ARGS__, NULL)
534 :
535 : #define kprobe_event_add_field(cmd, field) \
536 : __kprobe_event_add_fields(cmd, field, NULL)
537 :
538 : extern int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...);
539 :
540 : #define kprobe_event_gen_cmd_end(cmd) \
541 : dynevent_create(cmd)
542 :
543 : #define kretprobe_event_gen_cmd_end(cmd) \
544 : dynevent_create(cmd)
545 :
546 : /*
547 : * Event file flags:
548 : * ENABLED - The event is enabled
549 : * RECORDED_CMD - The comms should be recorded at sched_switch
550 : * RECORDED_TGID - The tgids should be recorded at sched_switch
551 : * FILTERED - The event has a filter attached
552 : * NO_SET_FILTER - Set when filter has error and is to be ignored
553 : * SOFT_MODE - The event is enabled/disabled by SOFT_DISABLED
554 : * SOFT_DISABLED - When set, do not trace the event (even though its
555 : * tracepoint may be enabled)
556 : * TRIGGER_MODE - When set, invoke the triggers associated with the event
557 : * TRIGGER_COND - When set, one or more triggers has an associated filter
558 : * PID_FILTER - When set, the event is filtered based on pid
559 : * WAS_ENABLED - Set when enabled to know to clear trace on module removal
560 : */
561 : enum {
562 : EVENT_FILE_FL_ENABLED = (1 << EVENT_FILE_FL_ENABLED_BIT),
563 : EVENT_FILE_FL_RECORDED_CMD = (1 << EVENT_FILE_FL_RECORDED_CMD_BIT),
564 : EVENT_FILE_FL_RECORDED_TGID = (1 << EVENT_FILE_FL_RECORDED_TGID_BIT),
565 : EVENT_FILE_FL_FILTERED = (1 << EVENT_FILE_FL_FILTERED_BIT),
566 : EVENT_FILE_FL_NO_SET_FILTER = (1 << EVENT_FILE_FL_NO_SET_FILTER_BIT),
567 : EVENT_FILE_FL_SOFT_MODE = (1 << EVENT_FILE_FL_SOFT_MODE_BIT),
568 : EVENT_FILE_FL_SOFT_DISABLED = (1 << EVENT_FILE_FL_SOFT_DISABLED_BIT),
569 : EVENT_FILE_FL_TRIGGER_MODE = (1 << EVENT_FILE_FL_TRIGGER_MODE_BIT),
570 : EVENT_FILE_FL_TRIGGER_COND = (1 << EVENT_FILE_FL_TRIGGER_COND_BIT),
571 : EVENT_FILE_FL_PID_FILTER = (1 << EVENT_FILE_FL_PID_FILTER_BIT),
572 : EVENT_FILE_FL_WAS_ENABLED = (1 << EVENT_FILE_FL_WAS_ENABLED_BIT),
573 : };
574 :
575 : struct trace_event_file {
576 : struct list_head list;
577 : struct trace_event_call *event_call;
578 : struct event_filter __rcu *filter;
579 : struct dentry *dir;
580 : struct trace_array *tr;
581 : struct trace_subsystem_dir *system;
582 : struct list_head triggers;
583 :
584 : /*
585 : * 32 bit flags:
586 : * bit 0: enabled
587 : * bit 1: enabled cmd record
588 : * bit 2: enable/disable with the soft disable bit
589 : * bit 3: soft disabled
590 : * bit 4: trigger enabled
591 : *
592 : * Note: The bits must be set atomically to prevent races
593 : * from other writers. Reads of flags do not need to be in
594 : * sync as they occur in critical sections. But the way flags
595 : * is currently used, these changes do not affect the code
596 : * except that when a change is made, it may have a slight
597 : * delay in propagating the changes to other CPUs due to
598 : * caching and such. Which is mostly OK ;-)
599 : */
600 : unsigned long flags;
601 : atomic_t sm_ref; /* soft-mode reference counter */
602 : atomic_t tm_ref; /* trigger-mode reference counter */
603 : };
604 :
605 : #define __TRACE_EVENT_FLAGS(name, value) \
606 : static int __init trace_init_flags_##name(void) \
607 : { \
608 : event_##name.flags |= value; \
609 : return 0; \
610 : } \
611 : early_initcall(trace_init_flags_##name);
612 :
613 : #define __TRACE_EVENT_PERF_PERM(name, expr...) \
614 : static int perf_perm_##name(struct trace_event_call *tp_event, \
615 : struct perf_event *p_event) \
616 : { \
617 : return ({ expr; }); \
618 : } \
619 : static int __init trace_init_perf_perm_##name(void) \
620 : { \
621 : event_##name.perf_perm = &perf_perm_##name; \
622 : return 0; \
623 : } \
624 : early_initcall(trace_init_perf_perm_##name);
625 :
626 : #define PERF_MAX_TRACE_SIZE 2048
627 :
628 : #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
629 :
630 : enum event_trigger_type {
631 : ETT_NONE = (0),
632 : ETT_TRACE_ONOFF = (1 << 0),
633 : ETT_SNAPSHOT = (1 << 1),
634 : ETT_STACKTRACE = (1 << 2),
635 : ETT_EVENT_ENABLE = (1 << 3),
636 : ETT_EVENT_HIST = (1 << 4),
637 : ETT_HIST_ENABLE = (1 << 5),
638 : };
639 :
640 : extern int filter_match_preds(struct event_filter *filter, void *rec);
641 :
642 : extern enum event_trigger_type
643 : event_triggers_call(struct trace_event_file *file, void *rec,
644 : struct ring_buffer_event *event);
645 : extern void
646 : event_triggers_post_call(struct trace_event_file *file,
647 : enum event_trigger_type tt);
648 :
649 : bool trace_event_ignore_this_pid(struct trace_event_file *trace_file);
650 :
651 : /**
652 : * trace_trigger_soft_disabled - do triggers and test if soft disabled
653 : * @file: The file pointer of the event to test
654 : *
655 : * If any triggers without filters are attached to this event, they
656 : * will be called here. If the event is soft disabled and has no
657 : * triggers that require testing the fields, it will return true,
658 : * otherwise false.
659 : */
660 : static inline bool
661 0 : trace_trigger_soft_disabled(struct trace_event_file *file)
662 : {
663 0 : unsigned long eflags = file->flags;
664 :
665 0 : if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
666 0 : if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
667 0 : event_triggers_call(file, NULL, NULL);
668 0 : if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
669 : return true;
670 0 : if (eflags & EVENT_FILE_FL_PID_FILTER)
671 0 : return trace_event_ignore_this_pid(file);
672 : }
673 : return false;
674 : }
675 :
676 : #ifdef CONFIG_BPF_EVENTS
677 : unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx);
678 : int perf_event_attach_bpf_prog(struct perf_event *event, struct bpf_prog *prog);
679 : void perf_event_detach_bpf_prog(struct perf_event *event);
680 : int perf_event_query_prog_array(struct perf_event *event, void __user *info);
681 : int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog *prog);
682 : int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_prog *prog);
683 : struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name);
684 : void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp);
685 : int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id,
686 : u32 *fd_type, const char **buf,
687 : u64 *probe_offset, u64 *probe_addr);
688 : #else
689 0 : static inline unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)
690 : {
691 0 : return 1;
692 : }
693 :
694 : static inline int
695 : perf_event_attach_bpf_prog(struct perf_event *event, struct bpf_prog *prog)
696 : {
697 : return -EOPNOTSUPP;
698 : }
699 :
700 : static inline void perf_event_detach_bpf_prog(struct perf_event *event) { }
701 :
702 : static inline int
703 0 : perf_event_query_prog_array(struct perf_event *event, void __user *info)
704 : {
705 0 : return -EOPNOTSUPP;
706 : }
707 : static inline int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog *p)
708 : {
709 : return -EOPNOTSUPP;
710 : }
711 : static inline int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_prog *p)
712 : {
713 : return -EOPNOTSUPP;
714 : }
715 : static inline struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name)
716 : {
717 : return NULL;
718 : }
719 : static inline void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp)
720 : {
721 : }
722 : static inline int bpf_get_perf_event_info(const struct perf_event *event,
723 : u32 *prog_id, u32 *fd_type,
724 : const char **buf, u64 *probe_offset,
725 : u64 *probe_addr)
726 : {
727 : return -EOPNOTSUPP;
728 : }
729 : #endif
730 :
731 : enum {
732 : FILTER_OTHER = 0,
733 : FILTER_STATIC_STRING,
734 : FILTER_DYN_STRING,
735 : FILTER_PTR_STRING,
736 : FILTER_TRACE_FN,
737 : FILTER_COMM,
738 : FILTER_CPU,
739 : };
740 :
741 : extern int trace_event_raw_init(struct trace_event_call *call);
742 : extern int trace_define_field(struct trace_event_call *call, const char *type,
743 : const char *name, int offset, int size,
744 : int is_signed, int filter_type);
745 : extern int trace_add_event_call(struct trace_event_call *call);
746 : extern int trace_remove_event_call(struct trace_event_call *call);
747 : extern int trace_event_get_offsets(struct trace_event_call *call);
748 :
749 : #define is_signed_type(type) (((type)(-1)) < (type)1)
750 :
751 : int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
752 : int trace_set_clr_event(const char *system, const char *event, int set);
753 : int trace_array_set_clr_event(struct trace_array *tr, const char *system,
754 : const char *event, bool enable);
755 : /*
756 : * The double __builtin_constant_p is because gcc will give us an error
757 : * if we try to allocate the static variable to fmt if it is not a
758 : * constant. Even with the outer if statement optimizing out.
759 : */
760 : #define event_trace_printk(ip, fmt, args...) \
761 : do { \
762 : __trace_printk_check_format(fmt, ##args); \
763 : tracing_record_cmdline(current); \
764 : if (__builtin_constant_p(fmt)) { \
765 : static const char *trace_printk_fmt \
766 : __section("__trace_printk_fmt") = \
767 : __builtin_constant_p(fmt) ? fmt : NULL; \
768 : \
769 : __trace_bprintk(ip, trace_printk_fmt, ##args); \
770 : } else \
771 : __trace_printk(ip, fmt, ##args); \
772 : } while (0)
773 :
774 : #ifdef CONFIG_PERF_EVENTS
775 : struct perf_event;
776 :
777 : DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
778 : DECLARE_PER_CPU(int, bpf_kprobe_override);
779 :
780 : extern int perf_trace_init(struct perf_event *event);
781 : extern void perf_trace_destroy(struct perf_event *event);
782 : extern int perf_trace_add(struct perf_event *event, int flags);
783 : extern void perf_trace_del(struct perf_event *event, int flags);
784 : #ifdef CONFIG_KPROBE_EVENTS
785 : extern int perf_kprobe_init(struct perf_event *event, bool is_retprobe);
786 : extern void perf_kprobe_destroy(struct perf_event *event);
787 : extern int bpf_get_kprobe_info(const struct perf_event *event,
788 : u32 *fd_type, const char **symbol,
789 : u64 *probe_offset, u64 *probe_addr,
790 : bool perf_type_tracepoint);
791 : #endif
792 : #ifdef CONFIG_UPROBE_EVENTS
793 : extern int perf_uprobe_init(struct perf_event *event,
794 : unsigned long ref_ctr_offset, bool is_retprobe);
795 : extern void perf_uprobe_destroy(struct perf_event *event);
796 : extern int bpf_get_uprobe_info(const struct perf_event *event,
797 : u32 *fd_type, const char **filename,
798 : u64 *probe_offset, bool perf_type_tracepoint);
799 : #endif
800 : extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
801 : char *filter_str);
802 : extern void ftrace_profile_free_filter(struct perf_event *event);
803 : void perf_trace_buf_update(void *record, u16 type);
804 : void *perf_trace_buf_alloc(int size, struct pt_regs **regs, int *rctxp);
805 :
806 : void bpf_trace_run1(struct bpf_prog *prog, u64 arg1);
807 : void bpf_trace_run2(struct bpf_prog *prog, u64 arg1, u64 arg2);
808 : void bpf_trace_run3(struct bpf_prog *prog, u64 arg1, u64 arg2,
809 : u64 arg3);
810 : void bpf_trace_run4(struct bpf_prog *prog, u64 arg1, u64 arg2,
811 : u64 arg3, u64 arg4);
812 : void bpf_trace_run5(struct bpf_prog *prog, u64 arg1, u64 arg2,
813 : u64 arg3, u64 arg4, u64 arg5);
814 : void bpf_trace_run6(struct bpf_prog *prog, u64 arg1, u64 arg2,
815 : u64 arg3, u64 arg4, u64 arg5, u64 arg6);
816 : void bpf_trace_run7(struct bpf_prog *prog, u64 arg1, u64 arg2,
817 : u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7);
818 : void bpf_trace_run8(struct bpf_prog *prog, u64 arg1, u64 arg2,
819 : u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
820 : u64 arg8);
821 : void bpf_trace_run9(struct bpf_prog *prog, u64 arg1, u64 arg2,
822 : u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
823 : u64 arg8, u64 arg9);
824 : void bpf_trace_run10(struct bpf_prog *prog, u64 arg1, u64 arg2,
825 : u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
826 : u64 arg8, u64 arg9, u64 arg10);
827 : void bpf_trace_run11(struct bpf_prog *prog, u64 arg1, u64 arg2,
828 : u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
829 : u64 arg8, u64 arg9, u64 arg10, u64 arg11);
830 : void bpf_trace_run12(struct bpf_prog *prog, u64 arg1, u64 arg2,
831 : u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
832 : u64 arg8, u64 arg9, u64 arg10, u64 arg11, u64 arg12);
833 : void perf_trace_run_bpf_submit(void *raw_data, int size, int rctx,
834 : struct trace_event_call *call, u64 count,
835 : struct pt_regs *regs, struct hlist_head *head,
836 : struct task_struct *task);
837 :
838 : static inline void
839 : perf_trace_buf_submit(void *raw_data, int size, int rctx, u16 type,
840 : u64 count, struct pt_regs *regs, void *head,
841 : struct task_struct *task)
842 : {
843 : perf_tp_event(type, count, raw_data, size, regs, head, rctx, task);
844 : }
845 :
846 : #endif
847 :
848 : #endif /* _LINUX_TRACE_EVENT_H */
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