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