summaryrefslogtreecommitdiff
path: root/include/linux/trace_events.h
blob: 21ae37e49319a13287ef895c51e1362ed20aeca7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _LINUX_TRACE_EVENT_H
#define _LINUX_TRACE_EVENT_H

#include <linux/ring_buffer.h>
#include <linux/trace_seq.h>
#include <linux/percpu.h>
#include <linux/hardirq.h>
#include <linux/perf_event.h>
#include <linux/tracepoint.h>

struct trace_array;
struct array_buffer;
struct tracer;
struct dentry;
struct bpf_prog;
union bpf_attr;

const char *trace_print_flags_seq(struct trace_seq *p, const char *delim,
				  unsigned long flags,
				  const struct trace_print_flags *flag_array);

const char *trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
				    const struct trace_print_flags *symbol_array);

#if BITS_PER_LONG == 32
const char *trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
		      unsigned long long flags,
		      const struct trace_print_flags_u64 *flag_array);

const char *trace_print_symbols_seq_u64(struct trace_seq *p,
					unsigned long long val,
					const struct trace_print_flags_u64
								 *symbol_array);
#endif

const char *trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
				    unsigned int bitmask_size);

const char *trace_print_hex_seq(struct trace_seq *p,
				const unsigned char *buf, int len,
				bool concatenate);

const char *trace_print_array_seq(struct trace_seq *p,
				   const void *buf, int count,
				   size_t el_size);

const char *
trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
			 int prefix_type, int rowsize, int groupsize,
			 const void *buf, size_t len, bool ascii);

struct trace_iterator;
struct trace_event;

int trace_raw_output_prep(struct trace_iterator *iter,
			  struct trace_event *event);
extern __printf(2, 3)
void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...);

/* Used to find the offset and length of dynamic fields in trace events */
struct trace_dynamic_info {
#ifdef CONFIG_CPU_BIG_ENDIAN
	u16	len;
	u16	offset;
#else
	u16	offset;
	u16	len;
#endif
} __packed;

/*
 * The trace entry - the most basic unit of tracing. This is what
 * is printed in the end as a single line in the trace output, such as:
 *
 *     bash-15816 [01]   235.197585: idle_cpu <- irq_enter
 */
struct trace_entry {
	unsigned short		type;
	unsigned char		flags;
	unsigned char		preempt_count;
	int			pid;
};

#define TRACE_EVENT_TYPE_MAX						\
	((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)

/*
 * Trace iterator - used by printout routines who present trace
 * results to users and which routines might sleep, etc:
 */
struct trace_iterator {
	struct trace_array	*tr;
	struct tracer		*trace;
	struct array_buffer	*array_buffer;
	void			*private;
	int			cpu_file;
	struct mutex		mutex;
	struct ring_buffer_iter	**buffer_iter;
	unsigned long		iter_flags;
	void			*temp;	/* temp holder */
	unsigned int		temp_size;
	char			*fmt;	/* modified format holder */
	unsigned int		fmt_size;
	long			wait_index;

	/* trace_seq for __print_flags() and __print_symbolic() etc. */
	struct trace_seq	tmp_seq;

	cpumask_var_t		started;

	/* it's true when current open file is snapshot */
	bool			snapshot;

	/* The below is zeroed out in pipe_read */
	struct trace_seq	seq;
	struct trace_entry	*ent;
	unsigned long		lost_events;
	int			leftover;
	int			ent_size;
	int			cpu;
	u64			ts;

	loff_t			pos;
	long			idx;

	/* All new field here will be zeroed out in pipe_read */
};

enum trace_iter_flags {
	TRACE_FILE_LAT_FMT	= 1,
	TRACE_FILE_ANNOTATE	= 2,
	TRACE_FILE_TIME_IN_NS	= 4,
};


typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
				      int flags, struct trace_event *event);

struct trace_event_functions {
	trace_print_func	trace;
	trace_print_func	raw;
	trace_print_func	hex;
	trace_print_func	binary;
};

struct trace_event {
	struct hlist_node		node;
	int				type;
	struct trace_event_functions	*funcs;
};

extern int register_trace_event(struct trace_event *event);
extern int unregister_trace_event(struct trace_event *event);

/* Return values for print_line callback */
enum print_line_t {
	TRACE_TYPE_PARTIAL_LINE	= 0,	/* Retry after flushing the seq */
	TRACE_TYPE_HANDLED	= 1,
	TRACE_TYPE_UNHANDLED	= 2,	/* Relay to other output functions */
	TRACE_TYPE_NO_CONSUME	= 3	/* Handled but ask to not consume */
};

enum print_line_t trace_handle_return(struct trace_seq *s);

static inline void tracing_generic_entry_update(struct trace_entry *entry,
						unsigned short type,
						unsigned int trace_ctx)
{
	entry->preempt_count		= trace_ctx & 0xff;
	entry->pid			= current->pid;
	entry->type			= type;
	entry->flags =			trace_ctx >> 16;
}

unsigned int tracing_gen_ctx_irq_test(unsigned int irqs_status);

enum trace_flag_type {
	TRACE_FLAG_IRQS_OFF		= 0x01,
	TRACE_FLAG_IRQS_NOSUPPORT	= 0x02,
	TRACE_FLAG_NEED_RESCHED		= 0x04,
	TRACE_FLAG_HARDIRQ		= 0x08,
	TRACE_FLAG_SOFTIRQ		= 0x10,
	TRACE_FLAG_PREEMPT_RESCHED	= 0x20,
	TRACE_FLAG_NMI			= 0x40,
	TRACE_FLAG_BH_OFF		= 0x80,
};

#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
static inline unsigned int tracing_gen_ctx_flags(unsigned long irqflags)
{
	unsigned int irq_status = irqs_disabled_flags(irqflags) ?
		TRACE_FLAG_IRQS_OFF : 0;
	return tracing_gen_ctx_irq_test(irq_status);
}
static inline unsigned int tracing_gen_ctx(void)
{
	unsigned long irqflags;

	local_save_flags(irqflags);
	return tracing_gen_ctx_flags(irqflags);
}
#else

static inline unsigned int tracing_gen_ctx_flags(unsigned long irqflags)
{
	return tracing_gen_ctx_irq_test(TRACE_FLAG_IRQS_NOSUPPORT);
}
static inline unsigned int tracing_gen_ctx(void)
{
	return tracing_gen_ctx_irq_test(TRACE_FLAG_IRQS_NOSUPPORT);
}
#endif

static inline unsigned int tracing_gen_ctx_dec(void)
{
	unsigned int trace_ctx;

	trace_ctx = tracing_gen_ctx();
	/*
	 * Subtract one from the preemption counter if preemption is enabled,
	 * see trace_event_buffer_reserve()for details.
	 */
	if (IS_ENABLED(CONFIG_PREEMPTION))
		trace_ctx--;
	return trace_ctx;
}

struct trace_event_file;

struct ring_buffer_event *
trace_event_buffer_lock_reserve(struct trace_buffer **current_buffer,
				struct trace_event_file *trace_file,
				int type, unsigned long len,
				unsigned int trace_ctx);

#define TRACE_RECORD_CMDLINE	BIT(0)
#define TRACE_RECORD_TGID	BIT(1)

void tracing_record_taskinfo(struct task_struct *task, int flags);
void tracing_record_taskinfo_sched_switch(struct task_struct *prev,
					  struct task_struct *next, int flags);

void tracing_record_cmdline(struct task_struct *task);
void tracing_record_tgid(struct task_struct *task);

int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
	 __printf(3, 4);

struct event_filter;

enum trace_reg {
	TRACE_REG_REGISTER,
	TRACE_REG_UNREGISTER,
#ifdef CONFIG_PERF_EVENTS
	TRACE_REG_PERF_REGISTER,
	TRACE_REG_PERF_UNREGISTER,
	TRACE_REG_PERF_OPEN,
	TRACE_REG_PERF_CLOSE,
	/*
	 * These (ADD/DEL) use a 'boolean' return value, where 1 (true) means a
	 * custom action was taken and the default action is not to be
	 * performed.
	 */
	TRACE_REG_PERF_ADD,
	TRACE_REG_PERF_DEL,
#endif
};

struct trace_event_call;

#define TRACE_FUNCTION_TYPE ((const char *)~0UL)

struct trace_event_fields {
	const char *type;
	union {
		struct {
			const char *name;
			const int  size;
			const int  align;
			const int  is_signed;
			const int  filter_type;
			const int  len;
		};
		int (*define_fields)(struct trace_event_call *);
	};
};

struct trace_event_class {
	const char		*system;
	void			*probe;
#ifdef CONFIG_PERF_EVENTS
	void			*perf_probe;
#endif
	int			(*reg)(struct trace_event_call *event,
				       enum trace_reg type, void *data);
	struct trace_event_fields *fields_array;
	struct list_head	*(*get_fields)(struct trace_event_call *);
	struct list_head	fields;
	int			(*raw_init)(struct trace_event_call *);
};

extern int trace_event_reg(struct trace_event_call *event,
			    enum trace_reg type, void *data);

struct trace_event_buffer {
	struct trace_buffer		*buffer;
	struct ring_buffer_event	*event;
	struct trace_event_file		*trace_file;
	void				*entry;
	unsigned int			trace_ctx;
	struct pt_regs			*regs;
};

void *trace_event_buffer_reserve(struct trace_event_buffer *fbuffer,
				  struct trace_event_file *trace_file,
				  unsigned long len);

void trace_event_buffer_commit(struct trace_event_buffer *fbuffer);

enum {
	TRACE_EVENT_FL_FILTERED_BIT,
	TRACE_EVENT_FL_CAP_ANY_BIT,
	TRACE_EVENT_FL_NO_SET_FILTER_BIT,
	TRACE_EVENT_FL_IGNORE_ENABLE_BIT,
	TRACE_EVENT_FL_TRACEPOINT_BIT,
	TRACE_EVENT_FL_DYNAMIC_BIT,
	TRACE_EVENT_FL_KPROBE_BIT,
	TRACE_EVENT_FL_UPROBE_BIT,
	TRACE_EVENT_FL_EPROBE_BIT,
	TRACE_EVENT_FL_FPROBE_BIT,
	TRACE_EVENT_FL_CUSTOM_BIT,
};

/*
 * Event flags:
 *  FILTERED	  - The event has a filter attached
 *  CAP_ANY	  - Any user can enable for perf
 *  NO_SET_FILTER - Set when filter has error and is to be ignored
 *  IGNORE_ENABLE - For trace internal events, do not enable with debugfs file
 *  TRACEPOINT    - Event is a tracepoint
 *  DYNAMIC       - Event is a dynamic event (created at run time)
 *  KPROBE        - Event is a kprobe
 *  UPROBE        - Event is a uprobe
 *  EPROBE        - Event is an event probe
 *  FPROBE        - Event is an function probe
 *  CUSTOM        - Event is a custom event (to be attached to an exsiting tracepoint)
 *                   This is set when the custom event has not been attached
 *                   to a tracepoint yet, then it is cleared when it is.
 */
enum {
	TRACE_EVENT_FL_FILTERED		= (1 << TRACE_EVENT_FL_FILTERED_BIT),
	TRACE_EVENT_FL_CAP_ANY		= (1 << TRACE_EVENT_FL_CAP_ANY_BIT),
	TRACE_EVENT_FL_NO_SET_FILTER	= (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
	TRACE_EVENT_FL_IGNORE_ENABLE	= (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT),
	TRACE_EVENT_FL_TRACEPOINT	= (1 << TRACE_EVENT_FL_TRACEPOINT_BIT),
	TRACE_EVENT_FL_DYNAMIC		= (1 << TRACE_EVENT_FL_DYNAMIC_BIT),
	TRACE_EVENT_FL_KPROBE		= (1 << TRACE_EVENT_FL_KPROBE_BIT),
	TRACE_EVENT_FL_UPROBE		= (1 << TRACE_EVENT_FL_UPROBE_BIT),
	TRACE_EVENT_FL_EPROBE		= (1 << TRACE_EVENT_FL_EPROBE_BIT),
	TRACE_EVENT_FL_FPROBE		= (1 << TRACE_EVENT_FL_FPROBE_BIT),
	TRACE_EVENT_FL_CUSTOM		= (1 << TRACE_EVENT_FL_CUSTOM_BIT),
};

#define TRACE_EVENT_FL_UKPROBE (TRACE_EVENT_FL_KPROBE | TRACE_EVENT_FL_UPROBE)

struct trace_event_call {
	struct list_head	list;
	struct trace_event_class *class;
	union {
		char			*name;
		/* Set TRACE_EVENT_FL_TRACEPOINT flag when using "tp" */
		struct tracepoint	*tp;
	};
	struct trace_event	event;
	char			*print_fmt;
	struct event_filter	*filter;
	/*
	 * Static events can disappear with modules,
	 * where as dynamic ones need their own ref count.
	 */
	union {
		void				*module;
		atomic_t			refcnt;
	};
	void			*data;

	/* See the TRACE_EVENT_FL_* flags above */
	int			flags; /* static flags of different events */

#ifdef CONFIG_PERF_EVENTS
	int				perf_refcount;
	struct hlist_head __percpu	*perf_events;
	struct bpf_prog_array __rcu	*prog_array;

	int	(*perf_perm)(struct trace_event_call *,
			     struct perf_event *);
#endif
};

#ifdef CONFIG_DYNAMIC_EVENTS
bool trace_event_dyn_try_get_ref(struct trace_event_call *call);
void trace_event_dyn_put_ref(struct trace_event_call *call);
bool trace_event_dyn_busy(struct trace_event_call *call);
#else
static inline bool trace_event_dyn_try_get_ref(struct trace_event_call *call)
{
	/* Without DYNAMIC_EVENTS configured, nothing should be calling this */
	return false;
}
static inline void trace_event_dyn_put_ref(struct trace_event_call *call)
{
}
static inline bool trace_event_dyn_busy(struct trace_event_call *call)
{
	/* Nothing should call this without DYNAIMIC_EVENTS configured. */
	return true;
}
#endif

static inline bool trace_event_try_get_ref(struct trace_event_call *call)
{
	if (call->flags & TRACE_EVENT_FL_DYNAMIC)
		return trace_event_dyn_try_get_ref(call);
	else
		return try_module_get(call->module);
}

static inline void trace_event_put_ref(struct trace_event_call *call)
{
	if (call->flags & TRACE_EVENT_FL_DYNAMIC)
		trace_event_dyn_put_ref(call);
	else
		module_put(call->module);
}

#ifdef CONFIG_PERF_EVENTS
static inline bool bpf_prog_array_valid(struct trace_event_call *call)
{
	/*
	 * This inline function checks whether call->prog_array
	 * is valid or not. The function is called in various places,
	 * outside rcu_read_lock/unlock, as a heuristic to speed up execution.
	 *
	 * If this function returns true, and later call->prog_array
	 * becomes false inside rcu_read_lock/unlock region,
	 * we bail out then. If this function return false,
	 * there is a risk that we might miss a few events if the checking
	 * were delayed until inside rcu_read_lock/unlock region and
	 * call->prog_array happened to become non-NULL then.
	 *
	 * Here, READ_ONCE() is used instead of rcu_access_pointer().
	 * rcu_access_pointer() requires the actual definition of
	 * "struct bpf_prog_array" while READ_ONCE() only needs
	 * a declaration of the same type.
	 */
	return !!READ_ONCE(call->prog_array);
}
#endif

static inline const char *
trace_event_name(struct trace_event_call *call)
{
	if (call->flags & TRACE_EVENT_FL_CUSTOM)
		return call->name;
	else if (call->flags & TRACE_EVENT_FL_TRACEPOINT)
		return call->tp ? call->tp->name : NULL;
	else
		return call->name;
}

static inline struct list_head *
trace_get_fields(struct trace_event_call *event_call)
{
	if (!event_call->class->get_fields)
		return &event_call->class->fields;
	return event_call->class->get_fields(event_call);
}

struct trace_subsystem_dir;

enum {
	EVENT_FILE_FL_ENABLED_BIT,
	EVENT_FILE_FL_RECORDED_CMD_BIT,
	EVENT_FILE_FL_RECORDED_TGID_BIT,
	EVENT_FILE_FL_FILTERED_BIT,
	EVENT_FILE_FL_NO_SET_FILTER_BIT,
	EVENT_FILE_FL_SOFT_MODE_BIT,
	EVENT_FILE_FL_SOFT_DISABLED_BIT,
	EVENT_FILE_FL_TRIGGER_MODE_BIT,
	EVENT_FILE_FL_TRIGGER_COND_BIT,
	EVENT_FILE_FL_PID_FILTER_BIT,
	EVENT_FILE_FL_WAS_ENABLED_BIT,
};

extern struct trace_event_file *trace_get_event_file(const char *instance,
						     const char *system,
						     const char *event);
extern void trace_put_event_file(struct trace_event_file *file);

#define MAX_DYNEVENT_CMD_LEN	(2048)

enum dynevent_type {
	DYNEVENT_TYPE_SYNTH = 1,
	DYNEVENT_TYPE_KPROBE,
	DYNEVENT_TYPE_NONE,
};

struct dynevent_cmd;

typedef int (*dynevent_create_fn_t)(struct dynevent_cmd *cmd);

struct dynevent_cmd {
	struct seq_buf		seq;
	const char		*event_name;
	unsigned int		n_fields;
	enum dynevent_type	type;
	dynevent_create_fn_t	run_command;
	void			*private_data;
};

extern int dynevent_create(struct dynevent_cmd *cmd);

extern int synth_event_delete(const char *name);

extern void synth_event_cmd_init(struct dynevent_cmd *cmd,
				 char *buf, int maxlen);

extern int __synth_event_gen_cmd_start(struct dynevent_cmd *cmd,
				       const char *name,
				       struct module *mod, ...);

#define synth_event_gen_cmd_start(cmd, name, mod, ...)	\
	__synth_event_gen_cmd_start(cmd, name, mod, ## __VA_ARGS__, NULL)

struct synth_field_desc {
	const char *type;
	const char *name;
};

extern int synth_event_gen_cmd_array_start(struct dynevent_cmd *cmd,
					   const char *name,
					   struct module *mod,
					   struct synth_field_desc *fields,
					   unsigned int n_fields);
extern int synth_event_create(const char *name,
			      struct synth_field_desc *fields,
			      unsigned int n_fields, struct module *mod);

extern int synth_event_add_field(struct dynevent_cmd *cmd,
				 const char *type,
				 const char *name);
extern int synth_event_add_field_str(struct dynevent_cmd *cmd,
				     const char *type_name);
extern int synth_event_add_fields(struct dynevent_cmd *cmd,
				  struct synth_field_desc *fields,
				  unsigned int n_fields);

#define synth_event_gen_cmd_end(cmd)	\
	dynevent_create(cmd)

struct synth_event;

struct synth_event_trace_state {
	struct trace_event_buffer fbuffer;
	struct synth_trace_event *entry;
	struct trace_buffer *buffer;
	struct synth_event *event;
	unsigned int cur_field;
	unsigned int n_u64;
	bool disabled;
	bool add_next;
	bool add_name;
};

extern int synth_event_trace(struct trace_event_file *file,
			     unsigned int n_vals, ...);
extern int synth_event_trace_array(struct trace_event_file *file, u64 *vals,
				   unsigned int n_vals);
extern int synth_event_trace_start(struct trace_event_file *file,
				   struct synth_event_trace_state *trace_state);
extern int synth_event_add_next_val(u64 val,
				    struct synth_event_trace_state *trace_state);
extern int synth_event_add_val(const char *field_name, u64 val,
			       struct synth_event_trace_state *trace_state);
extern int synth_event_trace_end(struct synth_event_trace_state *trace_state);

extern int kprobe_event_delete(const char *name);

extern void kprobe_event_cmd_init(struct dynevent_cmd *cmd,
				  char *buf, int maxlen);

#define kprobe_event_gen_cmd_start(cmd, name, loc, ...)			\
	__kprobe_event_gen_cmd_start(cmd, false, name, loc, ## __VA_ARGS__, NULL)

#define kretprobe_event_gen_cmd_start(cmd, name, loc, ...)		\
	__kprobe_event_gen_cmd_start(cmd, true, name, loc, ## __VA_ARGS__, NULL)

extern int __kprobe_event_gen_cmd_start(struct dynevent_cmd *cmd,
					bool kretprobe,
					const char *name,
					const char *loc, ...);

#define kprobe_event_add_fields(cmd, ...)	\
	__kprobe_event_add_fields(cmd, ## __VA_ARGS__, NULL)

#define kprobe_event_add_field(cmd, field)	\
	__kprobe_event_add_fields(cmd, field, NULL)

extern int __kprobe_event_add_fields(struct dynevent_cmd *cmd, ...);

#define kprobe_event_gen_cmd_end(cmd)		\
	dynevent_create(cmd)

#define kretprobe_event_gen_cmd_end(cmd)	\
	dynevent_create(cmd)

/*
 * Event file flags:
 *  ENABLED	  - The event is enabled
 *  RECORDED_CMD  - The comms should be recorded at sched_switch
 *  RECORDED_TGID - The tgids should be recorded at sched_switch
 *  FILTERED	  - The event has a filter attached
 *  NO_SET_FILTER - Set when filter has error and is to be ignored
 *  SOFT_MODE     - The event is enabled/disabled by SOFT_DISABLED
 *  SOFT_DISABLED - When set, do not trace the event (even though its
 *                   tracepoint may be enabled)
 *  TRIGGER_MODE  - When set, invoke the triggers associated with the event
 *  TRIGGER_COND  - When set, one or more triggers has an associated filter
 *  PID_FILTER    - When set, the event is filtered based on pid
 *  WAS_ENABLED   - Set when enabled to know to clear trace on module removal
 */
enum {
	EVENT_FILE_FL_ENABLED		= (1 << EVENT_FILE_FL_ENABLED_BIT),
	EVENT_FILE_FL_RECORDED_CMD	= (1 << EVENT_FILE_FL_RECORDED_CMD_BIT),
	EVENT_FILE_FL_RECORDED_TGID	= (1 << EVENT_FILE_FL_RECORDED_TGID_BIT),
	EVENT_FILE_FL_FILTERED		= (1 << EVENT_FILE_FL_FILTERED_BIT),
	EVENT_FILE_FL_NO_SET_FILTER	= (1 << EVENT_FILE_FL_NO_SET_FILTER_BIT),
	EVENT_FILE_FL_SOFT_MODE		= (1 << EVENT_FILE_FL_SOFT_MODE_BIT),
	EVENT_FILE_FL_SOFT_DISABLED	= (1 << EVENT_FILE_FL_SOFT_DISABLED_BIT),
	EVENT_FILE_FL_TRIGGER_MODE	= (1 << EVENT_FILE_FL_TRIGGER_MODE_BIT),
	EVENT_FILE_FL_TRIGGER_COND	= (1 << EVENT_FILE_FL_TRIGGER_COND_BIT),
	EVENT_FILE_FL_PID_FILTER	= (1 << EVENT_FILE_FL_PID_FILTER_BIT),
	EVENT_FILE_FL_WAS_ENABLED	= (1 << EVENT_FILE_FL_WAS_ENABLED_BIT),
};

struct trace_event_file {
	struct list_head		list;
	struct trace_event_call		*event_call;
	struct event_filter __rcu	*filter;
	struct eventfs_file             *ef;
	struct trace_array		*tr;
	struct trace_subsystem_dir	*system;
	struct list_head		triggers;

	/*
	 * 32 bit flags:
	 *   bit 0:		enabled
	 *   bit 1:		enabled cmd record
	 *   bit 2:		enable/disable with the soft disable bit
	 *   bit 3:		soft disabled
	 *   bit 4:		trigger enabled
	 *
	 * Note: The bits must be set atomically to prevent races
	 * from other writers. Reads of flags do not need to be in
	 * sync as they occur in critical sections. But the way flags
	 * is currently used, these changes do not affect the code
	 * except that when a change is made, it may have a slight
	 * delay in propagating the changes to other CPUs due to
	 * caching and such. Which is mostly OK ;-)
	 */
	unsigned long		flags;
	atomic_t		sm_ref;	/* soft-mode reference counter */
	atomic_t		tm_ref;	/* trigger-mode reference counter */
};

#define __TRACE_EVENT_FLAGS(name, value)				\
	static int __init trace_init_flags_##name(void)			\
	{								\
		event_##name.flags |= value;				\
		return 0;						\
	}								\
	early_initcall(trace_init_flags_##name);

#define __TRACE_EVENT_PERF_PERM(name, expr...)				\
	static int perf_perm_##name(struct trace_event_call *tp_event, \
				    struct perf_event *p_event)		\
	{								\
		return ({ expr; });					\
	}								\
	static int __init trace_init_perf_perm_##name(void)		\
	{								\
		event_##name.perf_perm = &perf_perm_##name;		\
		return 0;						\
	}								\
	early_initcall(trace_init_perf_perm_##name);

#define PERF_MAX_TRACE_SIZE	8192

#define MAX_FILTER_STR_VAL	256U	/* Should handle KSYM_SYMBOL_LEN */

enum event_trigger_type {
	ETT_NONE		= (0),
	ETT_TRACE_ONOFF		= (1 << 0),
	ETT_SNAPSHOT		= (1 << 1),
	ETT_STACKTRACE		= (1 << 2),
	ETT_EVENT_ENABLE	= (1 << 3),
	ETT_EVENT_HIST		= (1 << 4),
	ETT_HIST_ENABLE		= (1 << 5),
	ETT_EVENT_EPROBE	= (1 << 6),
};

extern int filter_match_preds(struct event_filter *filter, void *rec);

extern enum event_trigger_type
event_triggers_call(struct trace_event_file *file,
		    struct trace_buffer *buffer, void *rec,
		    struct ring_buffer_event *event);
extern void
event_triggers_post_call(struct trace_event_file *file,
			 enum event_trigger_type tt);

bool trace_event_ignore_this_pid(struct trace_event_file *trace_file);

bool __trace_trigger_soft_disabled(struct trace_event_file *file);

/**
 * trace_trigger_soft_disabled - do triggers and test if soft disabled
 * @file: The file pointer of the event to test
 *
 * If any triggers without filters are attached to this event, they
 * will be called here. If the event is soft disabled and has no
 * triggers that require testing the fields, it will return true,
 * otherwise false.
 */
static __always_inline bool
trace_trigger_soft_disabled(struct trace_event_file *file)
{
	unsigned long eflags = file->flags;

	if (likely(!(eflags & (EVENT_FILE_FL_TRIGGER_MODE |
			       EVENT_FILE_FL_SOFT_DISABLED |
			       EVENT_FILE_FL_PID_FILTER))))
		return false;

	if (likely(eflags & EVENT_FILE_FL_TRIGGER_COND))
		return false;

	return __trace_trigger_soft_disabled(file);
}

#ifdef CONFIG_BPF_EVENTS
unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx);
int perf_event_attach_bpf_prog(struct perf_event *event, struct bpf_prog *prog, u64 bpf_cookie);
void perf_event_detach_bpf_prog(struct perf_event *event);
int perf_event_query_prog_array(struct perf_event *event, void __user *info);
int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog *prog);
int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_prog *prog);
struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name);
void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp);
int 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);
int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog);
#else
static inline unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)
{
	return 1;
}

static inline int
perf_event_attach_bpf_prog(struct perf_event *event, struct bpf_prog *prog, u64 bpf_cookie)
{
	return -EOPNOTSUPP;
}

static inline void perf_event_detach_bpf_prog(struct perf_event *event) { }

static inline int
perf_event_query_prog_array(struct perf_event *event, void __user *info)
{
	return -EOPNOTSUPP;
}
static inline int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog *p)
{
	return -EOPNOTSUPP;
}
static inline int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_prog *p)
{
	return -EOPNOTSUPP;
}
static inline struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name)
{
	return NULL;
}
static inline void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp)
{
}
static inline int 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)
{
	return -EOPNOTSUPP;
}
static inline int
bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
{
	return -EOPNOTSUPP;
}
static inline int
bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
{
	return -EOPNOTSUPP;
}
#endif

enum {
	FILTER_OTHER = 0,
	FILTER_STATIC_STRING,
	FILTER_DYN_STRING,
	FILTER_RDYN_STRING,
	FILTER_PTR_STRING,
	FILTER_TRACE_FN,
	FILTER_CPUMASK,
	FILTER_COMM,
	FILTER_CPU,
	FILTER_STACKTRACE,
};

extern int trace_event_raw_init(struct trace_event_call *call);
extern int trace_define_field(struct trace_event_call *call, const char *type,
			      const char *name, int offset, int size,
			      int is_signed, int filter_type);
extern int trace_add_event_call(struct trace_event_call *call);
extern int trace_remove_event_call(struct trace_event_call *call);
extern int trace_event_get_offsets(struct trace_event_call *call);

int ftrace_set_clr_event(struct trace_array *tr, char *buf, int set);
int trace_set_clr_event(const char *system, const char *event, int set);
int trace_array_set_clr_event(struct trace_array *tr, const char *system,
		const char *event, bool enable);
/*
 * The double __builtin_constant_p is because gcc will give us an error
 * if we try to allocate the static variable to fmt if it is not a
 * constant. Even with the outer if statement optimizing out.
 */
#define event_trace_printk(ip, fmt, args...)				\
do {									\
	__trace_printk_check_format(fmt, ##args);			\
	tracing_record_cmdline(current);				\
	if (__builtin_constant_p(fmt)) {				\
		static const char *trace_printk_fmt			\
		  __section("__trace_printk_fmt") =			\
			__builtin_constant_p(fmt) ? fmt : NULL;		\
									\
		__trace_bprintk(ip, trace_printk_fmt, ##args);		\
	} else								\
		__trace_printk(ip, fmt, ##args);			\
} while (0)

#ifdef CONFIG_PERF_EVENTS
struct perf_event;

DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
DECLARE_PER_CPU(int, bpf_kprobe_override);

extern int  perf_trace_init(struct perf_event *event);
extern void perf_trace_destroy(struct perf_event *event);
extern int  perf_trace_add(struct perf_event *event, int flags);
extern void perf_trace_del(struct perf_event *event, int flags);
#ifdef CONFIG_KPROBE_EVENTS
extern int  perf_kprobe_init(struct perf_event *event, bool is_retprobe);
extern void perf_kprobe_destroy(struct perf_event *event);
extern int bpf_get_kprobe_info(const struct perf_event *event,
			       u32 *fd_type, const char **symbol,
			       u64 *probe_offset, u64 *probe_addr,
			       bool perf_type_tracepoint);
#endif
#ifdef CONFIG_UPROBE_EVENTS
extern int  perf_uprobe_init(struct perf_event *event,
			     unsigned long ref_ctr_offset, bool is_retprobe);
extern void perf_uprobe_destroy(struct perf_event *event);
extern int bpf_get_uprobe_info(const struct perf_event *event,
			       u32 *fd_type, const char **filename,
			       u64 *probe_offset, u64 *probe_addr,
			       bool perf_type_tracepoint);
#endif
extern int  ftrace_profile_set_filter(struct perf_event *event, int event_id,
				     char *filter_str);
extern void ftrace_profile_free_filter(struct perf_event *event);
void perf_trace_buf_update(void *record, u16 type);
void *perf_trace_buf_alloc(int size, struct pt_regs **regs, int *rctxp);

int perf_event_set_bpf_prog(struct perf_event *event, struct bpf_prog *prog, u64 bpf_cookie);
void perf_event_free_bpf_prog(struct perf_event *event);

void bpf_trace_run1(struct bpf_prog *prog, u64 arg1);
void bpf_trace_run2(struct bpf_prog *prog, u64 arg1, u64 arg2);
void bpf_trace_run3(struct bpf_prog *prog, u64 arg1, u64 arg2,
		    u64 arg3);
void bpf_trace_run4(struct bpf_prog *prog, u64 arg1, u64 arg2,
		    u64 arg3, u64 arg4);
void bpf_trace_run5(struct bpf_prog *prog, u64 arg1, u64 arg2,
		    u64 arg3, u64 arg4, u64 arg5);
void bpf_trace_run6(struct bpf_prog *prog, u64 arg1, u64 arg2,
		    u64 arg3, u64 arg4, u64 arg5, u64 arg6);
void bpf_trace_run7(struct bpf_prog *prog, u64 arg1, u64 arg2,
		    u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7);
void bpf_trace_run8(struct bpf_prog *prog, u64 arg1, u64 arg2,
		    u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
		    u64 arg8);
void bpf_trace_run9(struct bpf_prog *prog, u64 arg1, u64 arg2,
		    u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
		    u64 arg8, u64 arg9);
void bpf_trace_run10(struct bpf_prog *prog, u64 arg1, u64 arg2,
		     u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
		     u64 arg8, u64 arg9, u64 arg10);
void bpf_trace_run11(struct bpf_prog *prog, u64 arg1, u64 arg2,
		     u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
		     u64 arg8, u64 arg9, u64 arg10, u64 arg11);
void bpf_trace_run12(struct bpf_prog *prog, u64 arg1, u64 arg2,
		     u64 arg3, u64 arg4, u64 arg5, u64 arg6, u64 arg7,
		     u64 arg8, u64 arg9, u64 arg10, u64 arg11, u64 arg12);
void perf_trace_run_bpf_submit(void *raw_data, int size, int rctx,
			       struct trace_event_call *call, u64 count,
			       struct pt_regs *regs, struct hlist_head *head,
			       struct task_struct *task);

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)
{
	perf_tp_event(type, count, raw_data, size, regs, head, rctx, task);
}

#endif

#define TRACE_EVENT_STR_MAX	512

/*
 * gcc warns that you can not use a va_list in an inlined
 * function. But lets me make it into a macro :-/
 */
#define __trace_event_vstr_len(fmt, va)			\
({							\
	va_list __ap;					\
	int __ret;					\
							\
	va_copy(__ap, *(va));				\
	__ret = vsnprintf(NULL, 0, fmt, __ap) + 1;	\
	va_end(__ap);					\
							\
	min(__ret, TRACE_EVENT_STR_MAX);		\
})

#endif /* _LINUX_TRACE_EVENT_H */

/*
 * Note: we keep the TRACE_CUSTOM_EVENT outside the include file ifdef protection.
 *  This is due to the way trace custom events work. If a file includes two
 *  trace event headers under one "CREATE_CUSTOM_TRACE_EVENTS" the first include
 *  will override the TRACE_CUSTOM_EVENT and break the second include.
 */

#ifndef TRACE_CUSTOM_EVENT

#define DECLARE_CUSTOM_EVENT_CLASS(name, proto, args, tstruct, assign, print)
#define DEFINE_CUSTOM_EVENT(template, name, proto, args)
#define TRACE_CUSTOM_EVENT(name, proto, args, struct, assign, print)

#endif /* ifdef TRACE_CUSTOM_EVENT (see note above) */