xref: /openbmc/linux/kernel/trace/trace.h (revision 4800cd83)
1 #ifndef _LINUX_KERNEL_TRACE_H
2 #define _LINUX_KERNEL_TRACE_H
3 
4 #include <linux/fs.h>
5 #include <asm/atomic.h>
6 #include <linux/sched.h>
7 #include <linux/clocksource.h>
8 #include <linux/ring_buffer.h>
9 #include <linux/mmiotrace.h>
10 #include <linux/tracepoint.h>
11 #include <linux/ftrace.h>
12 #include <linux/hw_breakpoint.h>
13 #include <linux/trace_seq.h>
14 #include <linux/ftrace_event.h>
15 
16 enum trace_type {
17 	__TRACE_FIRST_TYPE = 0,
18 
19 	TRACE_FN,
20 	TRACE_CTX,
21 	TRACE_WAKE,
22 	TRACE_STACK,
23 	TRACE_PRINT,
24 	TRACE_BPRINT,
25 	TRACE_MMIO_RW,
26 	TRACE_MMIO_MAP,
27 	TRACE_BRANCH,
28 	TRACE_GRAPH_RET,
29 	TRACE_GRAPH_ENT,
30 	TRACE_USER_STACK,
31 	TRACE_BLK,
32 
33 	__TRACE_LAST_TYPE,
34 };
35 
36 
37 #undef __field
38 #define __field(type, item)		type	item;
39 
40 #undef __field_struct
41 #define __field_struct(type, item)	__field(type, item)
42 
43 #undef __field_desc
44 #define __field_desc(type, container, item)
45 
46 #undef __array
47 #define __array(type, item, size)	type	item[size];
48 
49 #undef __array_desc
50 #define __array_desc(type, container, item, size)
51 
52 #undef __dynamic_array
53 #define __dynamic_array(type, item)	type	item[];
54 
55 #undef F_STRUCT
56 #define F_STRUCT(args...)		args
57 
58 #undef FTRACE_ENTRY
59 #define FTRACE_ENTRY(name, struct_name, id, tstruct, print)	\
60 	struct struct_name {					\
61 		struct trace_entry	ent;			\
62 		tstruct						\
63 	}
64 
65 #undef TP_ARGS
66 #define TP_ARGS(args...)	args
67 
68 #undef FTRACE_ENTRY_DUP
69 #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
70 
71 #include "trace_entries.h"
72 
73 /*
74  * syscalls are special, and need special handling, this is why
75  * they are not included in trace_entries.h
76  */
77 struct syscall_trace_enter {
78 	struct trace_entry	ent;
79 	int			nr;
80 	unsigned long		args[];
81 };
82 
83 struct syscall_trace_exit {
84 	struct trace_entry	ent;
85 	int			nr;
86 	long			ret;
87 };
88 
89 struct kprobe_trace_entry_head {
90 	struct trace_entry	ent;
91 	unsigned long		ip;
92 };
93 
94 struct kretprobe_trace_entry_head {
95 	struct trace_entry	ent;
96 	unsigned long		func;
97 	unsigned long		ret_ip;
98 };
99 
100 /*
101  * trace_flag_type is an enumeration that holds different
102  * states when a trace occurs. These are:
103  *  IRQS_OFF		- interrupts were disabled
104  *  IRQS_NOSUPPORT	- arch does not support irqs_disabled_flags
105  *  NEED_RESCHED	- reschedule is requested
106  *  HARDIRQ		- inside an interrupt handler
107  *  SOFTIRQ		- inside a softirq handler
108  */
109 enum trace_flag_type {
110 	TRACE_FLAG_IRQS_OFF		= 0x01,
111 	TRACE_FLAG_IRQS_NOSUPPORT	= 0x02,
112 	TRACE_FLAG_NEED_RESCHED		= 0x04,
113 	TRACE_FLAG_HARDIRQ		= 0x08,
114 	TRACE_FLAG_SOFTIRQ		= 0x10,
115 };
116 
117 #define TRACE_BUF_SIZE		1024
118 
119 /*
120  * The CPU trace array - it consists of thousands of trace entries
121  * plus some other descriptor data: (for example which task started
122  * the trace, etc.)
123  */
124 struct trace_array_cpu {
125 	atomic_t		disabled;
126 	void			*buffer_page;	/* ring buffer spare */
127 
128 	unsigned long		saved_latency;
129 	unsigned long		critical_start;
130 	unsigned long		critical_end;
131 	unsigned long		critical_sequence;
132 	unsigned long		nice;
133 	unsigned long		policy;
134 	unsigned long		rt_priority;
135 	unsigned long		skipped_entries;
136 	cycle_t			preempt_timestamp;
137 	pid_t			pid;
138 	uid_t			uid;
139 	char			comm[TASK_COMM_LEN];
140 };
141 
142 /*
143  * The trace array - an array of per-CPU trace arrays. This is the
144  * highest level data structure that individual tracers deal with.
145  * They have on/off state as well:
146  */
147 struct trace_array {
148 	struct ring_buffer	*buffer;
149 	unsigned long		entries;
150 	int			cpu;
151 	cycle_t			time_start;
152 	struct task_struct	*waiter;
153 	struct trace_array_cpu	*data[NR_CPUS];
154 };
155 
156 #define FTRACE_CMP_TYPE(var, type) \
157 	__builtin_types_compatible_p(typeof(var), type *)
158 
159 #undef IF_ASSIGN
160 #define IF_ASSIGN(var, entry, etype, id)		\
161 	if (FTRACE_CMP_TYPE(var, etype)) {		\
162 		var = (typeof(var))(entry);		\
163 		WARN_ON(id && (entry)->type != id);	\
164 		break;					\
165 	}
166 
167 /* Will cause compile errors if type is not found. */
168 extern void __ftrace_bad_type(void);
169 
170 /*
171  * The trace_assign_type is a verifier that the entry type is
172  * the same as the type being assigned. To add new types simply
173  * add a line with the following format:
174  *
175  * IF_ASSIGN(var, ent, type, id);
176  *
177  *  Where "type" is the trace type that includes the trace_entry
178  *  as the "ent" item. And "id" is the trace identifier that is
179  *  used in the trace_type enum.
180  *
181  *  If the type can have more than one id, then use zero.
182  */
183 #define trace_assign_type(var, ent)					\
184 	do {								\
185 		IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN);	\
186 		IF_ASSIGN(var, ent, struct ctx_switch_entry, 0);	\
187 		IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK);	\
188 		IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
189 		IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT);	\
190 		IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT);	\
191 		IF_ASSIGN(var, ent, struct trace_mmiotrace_rw,		\
192 			  TRACE_MMIO_RW);				\
193 		IF_ASSIGN(var, ent, struct trace_mmiotrace_map,		\
194 			  TRACE_MMIO_MAP);				\
195 		IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
196 		IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,	\
197 			  TRACE_GRAPH_ENT);		\
198 		IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry,	\
199 			  TRACE_GRAPH_RET);		\
200 		__ftrace_bad_type();					\
201 	} while (0)
202 
203 /*
204  * An option specific to a tracer. This is a boolean value.
205  * The bit is the bit index that sets its value on the
206  * flags value in struct tracer_flags.
207  */
208 struct tracer_opt {
209 	const char	*name; /* Will appear on the trace_options file */
210 	u32		bit; /* Mask assigned in val field in tracer_flags */
211 };
212 
213 /*
214  * The set of specific options for a tracer. Your tracer
215  * have to set the initial value of the flags val.
216  */
217 struct tracer_flags {
218 	u32			val;
219 	struct tracer_opt	*opts;
220 };
221 
222 /* Makes more easy to define a tracer opt */
223 #define TRACER_OPT(s, b)	.name = #s, .bit = b
224 
225 
226 /**
227  * struct tracer - a specific tracer and its callbacks to interact with debugfs
228  * @name: the name chosen to select it on the available_tracers file
229  * @init: called when one switches to this tracer (echo name > current_tracer)
230  * @reset: called when one switches to another tracer
231  * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
232  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
233  * @open: called when the trace file is opened
234  * @pipe_open: called when the trace_pipe file is opened
235  * @wait_pipe: override how the user waits for traces on trace_pipe
236  * @close: called when the trace file is released
237  * @pipe_close: called when the trace_pipe file is released
238  * @read: override the default read callback on trace_pipe
239  * @splice_read: override the default splice_read callback on trace_pipe
240  * @selftest: selftest to run on boot (see trace_selftest.c)
241  * @print_headers: override the first lines that describe your columns
242  * @print_line: callback that prints a trace
243  * @set_flag: signals one of your private flags changed (trace_options file)
244  * @flags: your private flags
245  */
246 struct tracer {
247 	const char		*name;
248 	int			(*init)(struct trace_array *tr);
249 	void			(*reset)(struct trace_array *tr);
250 	void			(*start)(struct trace_array *tr);
251 	void			(*stop)(struct trace_array *tr);
252 	void			(*open)(struct trace_iterator *iter);
253 	void			(*pipe_open)(struct trace_iterator *iter);
254 	void			(*wait_pipe)(struct trace_iterator *iter);
255 	void			(*close)(struct trace_iterator *iter);
256 	void			(*pipe_close)(struct trace_iterator *iter);
257 	ssize_t			(*read)(struct trace_iterator *iter,
258 					struct file *filp, char __user *ubuf,
259 					size_t cnt, loff_t *ppos);
260 	ssize_t			(*splice_read)(struct trace_iterator *iter,
261 					       struct file *filp,
262 					       loff_t *ppos,
263 					       struct pipe_inode_info *pipe,
264 					       size_t len,
265 					       unsigned int flags);
266 #ifdef CONFIG_FTRACE_STARTUP_TEST
267 	int			(*selftest)(struct tracer *trace,
268 					    struct trace_array *tr);
269 #endif
270 	void			(*print_header)(struct seq_file *m);
271 	enum print_line_t	(*print_line)(struct trace_iterator *iter);
272 	/* If you handled the flag setting, return 0 */
273 	int			(*set_flag)(u32 old_flags, u32 bit, int set);
274 	struct tracer		*next;
275 	int			print_max;
276 	struct tracer_flags	*flags;
277 	int			use_max_tr;
278 };
279 
280 
281 #define TRACE_PIPE_ALL_CPU	-1
282 
283 int tracer_init(struct tracer *t, struct trace_array *tr);
284 int tracing_is_enabled(void);
285 void trace_wake_up(void);
286 void tracing_reset(struct trace_array *tr, int cpu);
287 void tracing_reset_online_cpus(struct trace_array *tr);
288 void tracing_reset_current(int cpu);
289 void tracing_reset_current_online_cpus(void);
290 int tracing_open_generic(struct inode *inode, struct file *filp);
291 struct dentry *trace_create_file(const char *name,
292 				 mode_t mode,
293 				 struct dentry *parent,
294 				 void *data,
295 				 const struct file_operations *fops);
296 
297 struct dentry *tracing_init_dentry(void);
298 
299 struct ring_buffer_event;
300 
301 struct ring_buffer_event *
302 trace_buffer_lock_reserve(struct ring_buffer *buffer,
303 			  int type,
304 			  unsigned long len,
305 			  unsigned long flags,
306 			  int pc);
307 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
308 				struct ring_buffer_event *event,
309 				unsigned long flags, int pc);
310 
311 struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
312 						struct trace_array_cpu *data);
313 
314 struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
315 					  int *ent_cpu, u64 *ent_ts);
316 
317 int trace_empty(struct trace_iterator *iter);
318 
319 void *trace_find_next_entry_inc(struct trace_iterator *iter);
320 
321 void trace_init_global_iter(struct trace_iterator *iter);
322 
323 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
324 
325 void default_wait_pipe(struct trace_iterator *iter);
326 void poll_wait_pipe(struct trace_iterator *iter);
327 
328 void ftrace(struct trace_array *tr,
329 			    struct trace_array_cpu *data,
330 			    unsigned long ip,
331 			    unsigned long parent_ip,
332 			    unsigned long flags, int pc);
333 void tracing_sched_switch_trace(struct trace_array *tr,
334 				struct task_struct *prev,
335 				struct task_struct *next,
336 				unsigned long flags, int pc);
337 
338 void tracing_sched_wakeup_trace(struct trace_array *tr,
339 				struct task_struct *wakee,
340 				struct task_struct *cur,
341 				unsigned long flags, int pc);
342 void trace_function(struct trace_array *tr,
343 		    unsigned long ip,
344 		    unsigned long parent_ip,
345 		    unsigned long flags, int pc);
346 void trace_graph_function(struct trace_array *tr,
347 		    unsigned long ip,
348 		    unsigned long parent_ip,
349 		    unsigned long flags, int pc);
350 void trace_default_header(struct seq_file *m);
351 void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
352 int trace_empty(struct trace_iterator *iter);
353 
354 void trace_graph_return(struct ftrace_graph_ret *trace);
355 int trace_graph_entry(struct ftrace_graph_ent *trace);
356 void set_graph_array(struct trace_array *tr);
357 
358 void tracing_start_cmdline_record(void);
359 void tracing_stop_cmdline_record(void);
360 void tracing_sched_switch_assign_trace(struct trace_array *tr);
361 void tracing_stop_sched_switch_record(void);
362 void tracing_start_sched_switch_record(void);
363 int register_tracer(struct tracer *type);
364 void unregister_tracer(struct tracer *type);
365 int is_tracing_stopped(void);
366 enum trace_file_type {
367 	TRACE_FILE_LAT_FMT	= 1,
368 	TRACE_FILE_ANNOTATE	= 2,
369 };
370 
371 extern cpumask_var_t __read_mostly tracing_buffer_mask;
372 
373 #define for_each_tracing_cpu(cpu)	\
374 	for_each_cpu(cpu, tracing_buffer_mask)
375 
376 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
377 
378 extern unsigned long tracing_thresh;
379 
380 #ifdef CONFIG_TRACER_MAX_TRACE
381 extern unsigned long tracing_max_latency;
382 
383 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
384 void update_max_tr_single(struct trace_array *tr,
385 			  struct task_struct *tsk, int cpu);
386 #endif /* CONFIG_TRACER_MAX_TRACE */
387 
388 #ifdef CONFIG_STACKTRACE
389 void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
390 			int skip, int pc);
391 
392 void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
393 			    int pc);
394 
395 void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
396 		   int pc);
397 #else
398 static inline void ftrace_trace_stack(struct ring_buffer *buffer,
399 				      unsigned long flags, int skip, int pc)
400 {
401 }
402 
403 static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
404 					  unsigned long flags, int pc)
405 {
406 }
407 
408 static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
409 				 int skip, int pc)
410 {
411 }
412 #endif /* CONFIG_STACKTRACE */
413 
414 extern cycle_t ftrace_now(int cpu);
415 
416 extern void trace_find_cmdline(int pid, char comm[]);
417 
418 #ifdef CONFIG_DYNAMIC_FTRACE
419 extern unsigned long ftrace_update_tot_cnt;
420 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
421 extern int DYN_FTRACE_TEST_NAME(void);
422 #endif
423 
424 extern int ring_buffer_expanded;
425 extern bool tracing_selftest_disabled;
426 DECLARE_PER_CPU(int, ftrace_cpu_disabled);
427 
428 #ifdef CONFIG_FTRACE_STARTUP_TEST
429 extern int trace_selftest_startup_function(struct tracer *trace,
430 					   struct trace_array *tr);
431 extern int trace_selftest_startup_function_graph(struct tracer *trace,
432 						 struct trace_array *tr);
433 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
434 					  struct trace_array *tr);
435 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
436 					     struct trace_array *tr);
437 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
438 						 struct trace_array *tr);
439 extern int trace_selftest_startup_wakeup(struct tracer *trace,
440 					 struct trace_array *tr);
441 extern int trace_selftest_startup_nop(struct tracer *trace,
442 					 struct trace_array *tr);
443 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
444 					       struct trace_array *tr);
445 extern int trace_selftest_startup_branch(struct tracer *trace,
446 					 struct trace_array *tr);
447 #endif /* CONFIG_FTRACE_STARTUP_TEST */
448 
449 extern void *head_page(struct trace_array_cpu *data);
450 extern unsigned long long ns2usecs(cycle_t nsec);
451 extern int
452 trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
453 extern int
454 trace_vprintk(unsigned long ip, const char *fmt, va_list args);
455 extern int
456 trace_array_vprintk(struct trace_array *tr,
457 		    unsigned long ip, const char *fmt, va_list args);
458 int trace_array_printk(struct trace_array *tr,
459 		       unsigned long ip, const char *fmt, ...);
460 void trace_printk_seq(struct trace_seq *s);
461 enum print_line_t print_trace_line(struct trace_iterator *iter);
462 
463 extern unsigned long trace_flags;
464 
465 extern int trace_clock_id;
466 
467 /* Standard output formatting function used for function return traces */
468 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
469 
470 /* Flag options */
471 #define TRACE_GRAPH_PRINT_OVERRUN       0x1
472 #define TRACE_GRAPH_PRINT_CPU           0x2
473 #define TRACE_GRAPH_PRINT_OVERHEAD      0x4
474 #define TRACE_GRAPH_PRINT_PROC          0x8
475 #define TRACE_GRAPH_PRINT_DURATION      0x10
476 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
477 
478 extern enum print_line_t
479 print_graph_function_flags(struct trace_iterator *iter, u32 flags);
480 extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
481 extern enum print_line_t
482 trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
483 extern void graph_trace_open(struct trace_iterator *iter);
484 extern void graph_trace_close(struct trace_iterator *iter);
485 extern int __trace_graph_entry(struct trace_array *tr,
486 			       struct ftrace_graph_ent *trace,
487 			       unsigned long flags, int pc);
488 extern void __trace_graph_return(struct trace_array *tr,
489 				 struct ftrace_graph_ret *trace,
490 				 unsigned long flags, int pc);
491 
492 
493 #ifdef CONFIG_DYNAMIC_FTRACE
494 /* TODO: make this variable */
495 #define FTRACE_GRAPH_MAX_FUNCS		32
496 extern int ftrace_graph_filter_enabled;
497 extern int ftrace_graph_count;
498 extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
499 
500 static inline int ftrace_graph_addr(unsigned long addr)
501 {
502 	int i;
503 
504 	if (!ftrace_graph_filter_enabled)
505 		return 1;
506 
507 	for (i = 0; i < ftrace_graph_count; i++) {
508 		if (addr == ftrace_graph_funcs[i])
509 			return 1;
510 	}
511 
512 	return 0;
513 }
514 #else
515 static inline int ftrace_graph_addr(unsigned long addr)
516 {
517 	return 1;
518 }
519 #endif /* CONFIG_DYNAMIC_FTRACE */
520 #else /* CONFIG_FUNCTION_GRAPH_TRACER */
521 static inline enum print_line_t
522 print_graph_function_flags(struct trace_iterator *iter, u32 flags)
523 {
524 	return TRACE_TYPE_UNHANDLED;
525 }
526 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
527 
528 extern struct list_head ftrace_pids;
529 
530 #ifdef CONFIG_FUNCTION_TRACER
531 static inline int ftrace_trace_task(struct task_struct *task)
532 {
533 	if (list_empty(&ftrace_pids))
534 		return 1;
535 
536 	return test_tsk_trace_trace(task);
537 }
538 #else
539 static inline int ftrace_trace_task(struct task_struct *task)
540 {
541 	return 1;
542 }
543 #endif
544 
545 /*
546  * struct trace_parser - servers for reading the user input separated by spaces
547  * @cont: set if the input is not complete - no final space char was found
548  * @buffer: holds the parsed user input
549  * @idx: user input length
550  * @size: buffer size
551  */
552 struct trace_parser {
553 	bool		cont;
554 	char		*buffer;
555 	unsigned	idx;
556 	unsigned	size;
557 };
558 
559 static inline bool trace_parser_loaded(struct trace_parser *parser)
560 {
561 	return (parser->idx != 0);
562 }
563 
564 static inline bool trace_parser_cont(struct trace_parser *parser)
565 {
566 	return parser->cont;
567 }
568 
569 static inline void trace_parser_clear(struct trace_parser *parser)
570 {
571 	parser->cont = false;
572 	parser->idx = 0;
573 }
574 
575 extern int trace_parser_get_init(struct trace_parser *parser, int size);
576 extern void trace_parser_put(struct trace_parser *parser);
577 extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
578 	size_t cnt, loff_t *ppos);
579 
580 /*
581  * trace_iterator_flags is an enumeration that defines bit
582  * positions into trace_flags that controls the output.
583  *
584  * NOTE: These bits must match the trace_options array in
585  *       trace.c.
586  */
587 enum trace_iterator_flags {
588 	TRACE_ITER_PRINT_PARENT		= 0x01,
589 	TRACE_ITER_SYM_OFFSET		= 0x02,
590 	TRACE_ITER_SYM_ADDR		= 0x04,
591 	TRACE_ITER_VERBOSE		= 0x08,
592 	TRACE_ITER_RAW			= 0x10,
593 	TRACE_ITER_HEX			= 0x20,
594 	TRACE_ITER_BIN			= 0x40,
595 	TRACE_ITER_BLOCK		= 0x80,
596 	TRACE_ITER_STACKTRACE		= 0x100,
597 	TRACE_ITER_PRINTK		= 0x200,
598 	TRACE_ITER_PREEMPTONLY		= 0x400,
599 	TRACE_ITER_BRANCH		= 0x800,
600 	TRACE_ITER_ANNOTATE		= 0x1000,
601 	TRACE_ITER_USERSTACKTRACE       = 0x2000,
602 	TRACE_ITER_SYM_USEROBJ          = 0x4000,
603 	TRACE_ITER_PRINTK_MSGONLY	= 0x8000,
604 	TRACE_ITER_CONTEXT_INFO		= 0x10000, /* Print pid/cpu/time */
605 	TRACE_ITER_LATENCY_FMT		= 0x20000,
606 	TRACE_ITER_SLEEP_TIME		= 0x40000,
607 	TRACE_ITER_GRAPH_TIME		= 0x80000,
608 	TRACE_ITER_RECORD_CMD		= 0x100000,
609 };
610 
611 /*
612  * TRACE_ITER_SYM_MASK masks the options in trace_flags that
613  * control the output of kernel symbols.
614  */
615 #define TRACE_ITER_SYM_MASK \
616 	(TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
617 
618 extern struct tracer nop_trace;
619 
620 #ifdef CONFIG_BRANCH_TRACER
621 extern int enable_branch_tracing(struct trace_array *tr);
622 extern void disable_branch_tracing(void);
623 static inline int trace_branch_enable(struct trace_array *tr)
624 {
625 	if (trace_flags & TRACE_ITER_BRANCH)
626 		return enable_branch_tracing(tr);
627 	return 0;
628 }
629 static inline void trace_branch_disable(void)
630 {
631 	/* due to races, always disable */
632 	disable_branch_tracing();
633 }
634 #else
635 static inline int trace_branch_enable(struct trace_array *tr)
636 {
637 	return 0;
638 }
639 static inline void trace_branch_disable(void)
640 {
641 }
642 #endif /* CONFIG_BRANCH_TRACER */
643 
644 /* set ring buffers to default size if not already done so */
645 int tracing_update_buffers(void);
646 
647 /* trace event type bit fields, not numeric */
648 enum {
649 	TRACE_EVENT_TYPE_PRINTF		= 1,
650 	TRACE_EVENT_TYPE_RAW		= 2,
651 };
652 
653 struct ftrace_event_field {
654 	struct list_head	link;
655 	char			*name;
656 	char			*type;
657 	int			filter_type;
658 	int			offset;
659 	int			size;
660 	int			is_signed;
661 };
662 
663 struct event_filter {
664 	int			n_preds;
665 	struct filter_pred	**preds;
666 	char			*filter_string;
667 };
668 
669 struct event_subsystem {
670 	struct list_head	list;
671 	const char		*name;
672 	struct dentry		*entry;
673 	struct event_filter	*filter;
674 	int			nr_events;
675 };
676 
677 struct filter_pred;
678 struct regex;
679 
680 typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
681 				 int val1, int val2);
682 
683 typedef int (*regex_match_func)(char *str, struct regex *r, int len);
684 
685 enum regex_type {
686 	MATCH_FULL = 0,
687 	MATCH_FRONT_ONLY,
688 	MATCH_MIDDLE_ONLY,
689 	MATCH_END_ONLY,
690 };
691 
692 struct regex {
693 	char			pattern[MAX_FILTER_STR_VAL];
694 	int			len;
695 	int			field_len;
696 	regex_match_func	match;
697 };
698 
699 struct filter_pred {
700 	filter_pred_fn_t 	fn;
701 	u64 			val;
702 	struct regex		regex;
703 	char 			*field_name;
704 	int 			offset;
705 	int 			not;
706 	int 			op;
707 	int 			pop_n;
708 };
709 
710 extern struct list_head ftrace_common_fields;
711 
712 extern enum regex_type
713 filter_parse_regex(char *buff, int len, char **search, int *not);
714 extern void print_event_filter(struct ftrace_event_call *call,
715 			       struct trace_seq *s);
716 extern int apply_event_filter(struct ftrace_event_call *call,
717 			      char *filter_string);
718 extern int apply_subsystem_event_filter(struct event_subsystem *system,
719 					char *filter_string);
720 extern void print_subsystem_event_filter(struct event_subsystem *system,
721 					 struct trace_seq *s);
722 extern int filter_assign_type(const char *type);
723 
724 struct list_head *
725 trace_get_fields(struct ftrace_event_call *event_call);
726 
727 static inline int
728 filter_check_discard(struct ftrace_event_call *call, void *rec,
729 		     struct ring_buffer *buffer,
730 		     struct ring_buffer_event *event)
731 {
732 	if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
733 	    !filter_match_preds(call->filter, rec)) {
734 		ring_buffer_discard_commit(buffer, event);
735 		return 1;
736 	}
737 
738 	return 0;
739 }
740 
741 extern void trace_event_enable_cmd_record(bool enable);
742 
743 extern struct mutex event_mutex;
744 extern struct list_head ftrace_events;
745 
746 extern const char *__start___trace_bprintk_fmt[];
747 extern const char *__stop___trace_bprintk_fmt[];
748 
749 #undef FTRACE_ENTRY
750 #define FTRACE_ENTRY(call, struct_name, id, tstruct, print)		\
751 	extern struct ftrace_event_call					\
752 	__attribute__((__aligned__(4))) event_##call;
753 #undef FTRACE_ENTRY_DUP
754 #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print)		\
755 	FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
756 #include "trace_entries.h"
757 
758 #endif /* _LINUX_KERNEL_TRACE_H */
759