[linux-2.6-block.git] / include / linux / trace_events.h


#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 trace_buffer;
struct tracer;
struct dentry;
struct bpf_prog;

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_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);

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

struct trace_iterator;
struct trace_event;

int trace_raw_output_prep(struct trace_iterator *iter,
			  struct trace_event *event);

/*
 * 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 trace_buffer	*trace_buffer;
	void			*private;
	int			cpu_file;
	struct mutex		mutex;
	struct ring_buffer_iter	**buffer_iter;
	unsigned long		iter_flags;

	/* 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;
	struct list_head		list;
	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 */
};

/*
 * Several functions return TRACE_TYPE_PARTIAL_LINE if the trace_seq
 * overflowed, and TRACE_TYPE_HANDLED otherwise. This helper function
 * simplifies those functions and keeps them in sync.
 */
static inline enum print_line_t trace_handle_return(struct trace_seq *s)
{
	return trace_seq_has_overflowed(s) ?
		TRACE_TYPE_PARTIAL_LINE : TRACE_TYPE_HANDLED;
}

void tracing_generic_entry_update(struct trace_entry *entry,
				  unsigned long flags,
				  int pc);
struct trace_event_file;

struct ring_buffer_event *
trace_event_buffer_lock_reserve(struct ring_buffer **current_buffer,
				struct trace_event_file *trace_file,
				int type, unsigned long len,
				unsigned long flags, int pc);

void tracing_record_cmdline(struct task_struct *tsk);

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

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,
	TRACE_REG_PERF_ADD,
	TRACE_REG_PERF_DEL,
#endif
};

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);
	int			(*define_fields)(struct trace_event_call *);
	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 ring_buffer		*buffer;
	struct ring_buffer_event	*event;
	struct trace_event_file		*trace_file;
	void				*entry;
	unsigned long			flags;
	int				pc;
};

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_WAS_ENABLED_BIT,
	TRACE_EVENT_FL_TRACEPOINT_BIT,
	TRACE_EVENT_FL_KPROBE_BIT,
	TRACE_EVENT_FL_UPROBE_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
 *  WAS_ENABLED   - Set and stays set when an event was ever enabled
 *                    (used for module unloading, if a module event is enabled,
 *                     it is best to clear the buffers that used it).
 *  TRACEPOINT    - Event is a tracepoint
 *  KPROBE        - Event is a kprobe
 *  UPROBE        - Event is a uprobe
 */
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_WAS_ENABLED	= (1 << TRACE_EVENT_FL_WAS_ENABLED_BIT),
	TRACE_EVENT_FL_TRACEPOINT	= (1 << TRACE_EVENT_FL_TRACEPOINT_BIT),
	TRACE_EVENT_FL_KPROBE		= (1 << TRACE_EVENT_FL_KPROBE_BIT),
	TRACE_EVENT_FL_UPROBE		= (1 << TRACE_EVENT_FL_UPROBE_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;
	void			*mod;
	void			*data;
	/*
	 *   bit 0:		filter_active
	 *   bit 1:		allow trace by non root (cap any)
	 *   bit 2:		failed to apply filter
	 *   bit 3:		trace internal event (do not enable)
	 *   bit 4:		Event was enabled by module
	 *   bit 5:		use call filter rather than file filter
	 *   bit 6:		Event is a tracepoint
	 */
	int			flags; /* static flags of different events */

#ifdef CONFIG_PERF_EVENTS
	int				perf_refcount;
	struct hlist_head __percpu	*perf_events;
	struct bpf_prog			*prog;

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

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

struct trace_array;
struct trace_subsystem_dir;

enum {
	EVENT_FILE_FL_ENABLED_BIT,
	EVENT_FILE_FL_RECORDED_CMD_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 flags:
 *  ENABLED	  - The event is enabled
 *  RECORDED_CMD  - The comms 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
 */
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_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),
};

struct trace_event_file {
	struct list_head		list;
	struct trace_event_call		*event_call;
	struct event_filter		*filter;
	struct dentry			*dir;
	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	2048

#define MAX_FILTER_STR_VAL	256	/* 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),
};

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

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

bool trace_event_ignore_this_pid(struct trace_event_file *trace_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 inline bool
trace_trigger_soft_disabled(struct trace_event_file *file)
{
	unsigned long eflags = file->flags;

	if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
		if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
			event_triggers_call(file, NULL);
		if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
			return true;
		if (eflags & EVENT_FILE_FL_PID_FILTER)
			return trace_event_ignore_this_pid(file);
	}
	return false;
}

#ifdef CONFIG_BPF_EVENTS
unsigned int trace_call_bpf(struct bpf_prog *prog, void *ctx);
#else
static inline unsigned int trace_call_bpf(struct bpf_prog *prog, void *ctx)
{
	return 1;
}
#endif

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

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);

#define is_signed_type(type)	(((type)(-1)) < (type)1)

int trace_set_clr_event(const char *system, const char *event, int set);

/*
 * 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			\
		  __attribute__((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);

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);
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);

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

#endif /* _LINUX_TRACE_EVENT_H */
Commit	Line	Data
	1
	2	#ifndef _LINUX_TRACE_EVENT_H
	3	#define _LINUX_TRACE_EVENT_H
	4
	5	#include <linux/ring_buffer.h>
	6	#include <linux/trace_seq.h>
	7	#include <linux/percpu.h>
	8	#include <linux/hardirq.h>
	9	#include <linux/perf_event.h>
	10	#include <linux/tracepoint.h>
	11
	12	struct trace_array;
	13	struct trace_buffer;
	14	struct tracer;
	15	struct dentry;
	16	struct bpf_prog;
	17
	18	const char trace_print_flags_seq(struct trace_seq p, const char *delim,
	19	unsigned long flags,
	20	const struct trace_print_flags *flag_array);
	21
	22	const char trace_print_symbols_seq(struct trace_seq p, unsigned long val,
	23	const struct trace_print_flags *symbol_array);
	24
	25	#if BITS_PER_LONG == 32
	26	const char trace_print_symbols_seq_u64(struct trace_seq p,
	27	unsigned long long val,
	28	const struct trace_print_flags_u64
	29	*symbol_array);
	30	#endif
	31
	32	const char trace_print_bitmask_seq(struct trace_seq p, void *bitmask_ptr,
	33	unsigned int bitmask_size);
	34
	35	const char trace_print_hex_seq(struct trace_seq p,
	36	const unsigned char *buf, int len);
	37
	38	const char trace_print_array_seq(struct trace_seq p,
	39	const void *buf, int count,
	40	size_t el_size);
	41
	42	struct trace_iterator;
	43	struct trace_event;
	44
	45	int trace_raw_output_prep(struct trace_iterator *iter,
	46	struct trace_event *event);
	47
	48	/*
	49	* The trace entry - the most basic unit of tracing. This is what
	50	* is printed in the end as a single line in the trace output, such as:
	51	*
	52	* bash-15816 [01] 235.197585: idle_cpu <- irq_enter
	53	*/
	54	struct trace_entry {
	55	unsigned short type;
	56	unsigned char flags;
	57	unsigned char preempt_count;
	58	int pid;
	59	};
	60
	61	#define TRACE_EVENT_TYPE_MAX \
	62	((1 << (sizeof(((struct trace_entry )0)->type) 8)) - 1)
	63
	64	/*
	65	* Trace iterator - used by printout routines who present trace
	66	* results to users and which routines might sleep, etc:
	67	*/
	68	struct trace_iterator {
	69	struct trace_array *tr;
	70	struct tracer *trace;
	71	struct trace_buffer *trace_buffer;
	72	void *private;
	73	int cpu_file;
	74	struct mutex mutex;
	75	struct ring_buffer_iter **buffer_iter;
	76	unsigned long iter_flags;
	77
	78	/* trace_seq for __print_flags() and __print_symbolic() etc. */
	79	struct trace_seq tmp_seq;
	80
	81	cpumask_var_t started;
	82
	83	/* it's true when current open file is snapshot */
	84	bool snapshot;
	85
	86	/* The below is zeroed out in pipe_read */
	87	struct trace_seq seq;
	88	struct trace_entry *ent;
	89	unsigned long lost_events;
	90	int leftover;
	91	int ent_size;
	92	int cpu;
	93	u64 ts;
	94
	95	loff_t pos;
	96	long idx;
	97
	98	/* All new field here will be zeroed out in pipe_read */
	99	};
	100
	101	enum trace_iter_flags {
	102	TRACE_FILE_LAT_FMT = 1,
	103	TRACE_FILE_ANNOTATE = 2,
	104	TRACE_FILE_TIME_IN_NS = 4,
	105	};
	106
	107
	108	typedef enum print_line_t (trace_print_func)(struct trace_iterator iter,
	109	int flags, struct trace_event *event);
	110
	111	struct trace_event_functions {
	112	trace_print_func trace;
	113	trace_print_func raw;
	114	trace_print_func hex;
	115	trace_print_func binary;
	116	};
	117
	118	struct trace_event {
	119	struct hlist_node node;
	120	struct list_head list;
	121	int type;
	122	struct trace_event_functions *funcs;
	123	};
	124
	125	extern int register_trace_event(struct trace_event *event);
	126	extern int unregister_trace_event(struct trace_event *event);
	127
	128	/* Return values for print_line callback */
	129	enum print_line_t {
	130	TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
	131	TRACE_TYPE_HANDLED = 1,
	132	TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
	133	TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
	134	};
	135
	136	/*
	137	* Several functions return TRACE_TYPE_PARTIAL_LINE if the trace_seq
	138	* overflowed, and TRACE_TYPE_HANDLED otherwise. This helper function
	139	* simplifies those functions and keeps them in sync.
	140	*/
	141	static inline enum print_line_t trace_handle_return(struct trace_seq *s)
	142	{
	143	return trace_seq_has_overflowed(s) ?
	144	TRACE_TYPE_PARTIAL_LINE : TRACE_TYPE_HANDLED;
	145	}
	146
	147	void tracing_generic_entry_update(struct trace_entry *entry,
	148	unsigned long flags,
	149	int pc);
	150	struct trace_event_file;
	151
	152	struct ring_buffer_event *
	153	trace_event_buffer_lock_reserve(struct ring_buffer **current_buffer,
	154	struct trace_event_file *trace_file,
	155	int type, unsigned long len,
	156	unsigned long flags, int pc);
	157
	158	void tracing_record_cmdline(struct task_struct *tsk);
	159
	160	int trace_output_call(struct trace_iterator iter, char name, char *fmt, ...);
	161
	162	struct event_filter;
	163
	164	enum trace_reg {
	165	TRACE_REG_REGISTER,
	166	TRACE_REG_UNREGISTER,
	167	#ifdef CONFIG_PERF_EVENTS
	168	TRACE_REG_PERF_REGISTER,
	169	TRACE_REG_PERF_UNREGISTER,
	170	TRACE_REG_PERF_OPEN,
	171	TRACE_REG_PERF_CLOSE,
	172	TRACE_REG_PERF_ADD,
	173	TRACE_REG_PERF_DEL,
	174	#endif
	175	};
	176
	177	struct trace_event_call;
	178
	179	struct trace_event_class {
	180	const char *system;
	181	void *probe;
	182	#ifdef CONFIG_PERF_EVENTS
	183	void *perf_probe;
	184	#endif
	185	int (reg)(struct trace_event_call event,
	186	enum trace_reg type, void *data);
	187	int (define_fields)(struct trace_event_call );
	188	struct list_head (get_fields)(struct trace_event_call *);
	189	struct list_head fields;
	190	int (raw_init)(struct trace_event_call );
	191	};
	192
	193	extern int trace_event_reg(struct trace_event_call *event,
	194	enum trace_reg type, void *data);
	195
	196	struct trace_event_buffer {
	197	struct ring_buffer *buffer;
	198	struct ring_buffer_event *event;
	199	struct trace_event_file *trace_file;
	200	void *entry;
	201	unsigned long flags;
	202	int pc;
	203	};
	204
	205	void trace_event_buffer_reserve(struct trace_event_buffer fbuffer,
	206	struct trace_event_file *trace_file,
	207	unsigned long len);
	208
	209	void trace_event_buffer_commit(struct trace_event_buffer *fbuffer);
	210
	211	enum {
	212	TRACE_EVENT_FL_FILTERED_BIT,
	213	TRACE_EVENT_FL_CAP_ANY_BIT,
	214	TRACE_EVENT_FL_NO_SET_FILTER_BIT,
	215	TRACE_EVENT_FL_IGNORE_ENABLE_BIT,
	216	TRACE_EVENT_FL_WAS_ENABLED_BIT,
	217	TRACE_EVENT_FL_TRACEPOINT_BIT,
	218	TRACE_EVENT_FL_KPROBE_BIT,
	219	TRACE_EVENT_FL_UPROBE_BIT,
	220	};
	221
	222	/*
	223	* Event flags:
	224	* FILTERED - The event has a filter attached
	225	* CAP_ANY - Any user can enable for perf
	226	* NO_SET_FILTER - Set when filter has error and is to be ignored
	227	* IGNORE_ENABLE - For trace internal events, do not enable with debugfs file
	228	* WAS_ENABLED - Set and stays set when an event was ever enabled
	229	* (used for module unloading, if a module event is enabled,
	230	* it is best to clear the buffers that used it).
	231	* TRACEPOINT - Event is a tracepoint
	232	* KPROBE - Event is a kprobe
	233	* UPROBE - Event is a uprobe
	234	*/
	235	enum {
	236	TRACE_EVENT_FL_FILTERED = (1 << TRACE_EVENT_FL_FILTERED_BIT),
	237	TRACE_EVENT_FL_CAP_ANY = (1 << TRACE_EVENT_FL_CAP_ANY_BIT),
	238	TRACE_EVENT_FL_NO_SET_FILTER = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
	239	TRACE_EVENT_FL_IGNORE_ENABLE = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT),
	240	TRACE_EVENT_FL_WAS_ENABLED = (1 << TRACE_EVENT_FL_WAS_ENABLED_BIT),
	241	TRACE_EVENT_FL_TRACEPOINT = (1 << TRACE_EVENT_FL_TRACEPOINT_BIT),
	242	TRACE_EVENT_FL_KPROBE = (1 << TRACE_EVENT_FL_KPROBE_BIT),
	243	TRACE_EVENT_FL_UPROBE = (1 << TRACE_EVENT_FL_UPROBE_BIT),
	244	};
	245
	246	#define TRACE_EVENT_FL_UKPROBE (TRACE_EVENT_FL_KPROBE \| TRACE_EVENT_FL_UPROBE)
	247
	248	struct trace_event_call {
	249	struct list_head list;
	250	struct trace_event_class *class;
	251	union {
	252	char *name;
	253	/* Set TRACE_EVENT_FL_TRACEPOINT flag when using "tp" */
	254	struct tracepoint *tp;
	255	};
	256	struct trace_event event;
	257	char *print_fmt;
	258	struct event_filter *filter;
	259	void *mod;
	260	void *data;
	261	/*
	262	* bit 0: filter_active
	263	* bit 1: allow trace by non root (cap any)
	264	* bit 2: failed to apply filter
	265	* bit 3: trace internal event (do not enable)
	266	* bit 4: Event was enabled by module
	267	* bit 5: use call filter rather than file filter
	268	* bit 6: Event is a tracepoint
	269	*/
	270	int flags; /* static flags of different events */
	271
	272	#ifdef CONFIG_PERF_EVENTS
	273	int perf_refcount;
	274	struct hlist_head __percpu *perf_events;
	275	struct bpf_prog *prog;
	276
	277	int (perf_perm)(struct trace_event_call ,
	278	struct perf_event *);
	279	#endif
	280	};
	281
	282	static inline const char *
	283	trace_event_name(struct trace_event_call *call)
	284	{
	285	if (call->flags & TRACE_EVENT_FL_TRACEPOINT)
	286	return call->tp ? call->tp->name : NULL;
	287	else
	288	return call->name;
	289	}
	290
	291	struct trace_array;
	292	struct trace_subsystem_dir;
	293
	294	enum {
	295	EVENT_FILE_FL_ENABLED_BIT,
	296	EVENT_FILE_FL_RECORDED_CMD_BIT,
	297	EVENT_FILE_FL_FILTERED_BIT,
	298	EVENT_FILE_FL_NO_SET_FILTER_BIT,
	299	EVENT_FILE_FL_SOFT_MODE_BIT,
	300	EVENT_FILE_FL_SOFT_DISABLED_BIT,
	301	EVENT_FILE_FL_TRIGGER_MODE_BIT,
	302	EVENT_FILE_FL_TRIGGER_COND_BIT,
	303	EVENT_FILE_FL_PID_FILTER_BIT,
	304	};
	305
	306	/*
	307	* Event file flags:
	308	* ENABLED - The event is enabled
	309	* RECORDED_CMD - The comms should be recorded at sched_switch
	310	* FILTERED - The event has a filter attached
	311	* NO_SET_FILTER - Set when filter has error and is to be ignored
	312	* SOFT_MODE - The event is enabled/disabled by SOFT_DISABLED
	313	* SOFT_DISABLED - When set, do not trace the event (even though its
	314	* tracepoint may be enabled)
	315	* TRIGGER_MODE - When set, invoke the triggers associated with the event
	316	* TRIGGER_COND - When set, one or more triggers has an associated filter
	317	* PID_FILTER - When set, the event is filtered based on pid
	318	*/
	319	enum {
	320	EVENT_FILE_FL_ENABLED = (1 << EVENT_FILE_FL_ENABLED_BIT),
	321	EVENT_FILE_FL_RECORDED_CMD = (1 << EVENT_FILE_FL_RECORDED_CMD_BIT),
	322	EVENT_FILE_FL_FILTERED = (1 << EVENT_FILE_FL_FILTERED_BIT),
	323	EVENT_FILE_FL_NO_SET_FILTER = (1 << EVENT_FILE_FL_NO_SET_FILTER_BIT),
	324	EVENT_FILE_FL_SOFT_MODE = (1 << EVENT_FILE_FL_SOFT_MODE_BIT),
	325	EVENT_FILE_FL_SOFT_DISABLED = (1 << EVENT_FILE_FL_SOFT_DISABLED_BIT),
	326	EVENT_FILE_FL_TRIGGER_MODE = (1 << EVENT_FILE_FL_TRIGGER_MODE_BIT),
	327	EVENT_FILE_FL_TRIGGER_COND = (1 << EVENT_FILE_FL_TRIGGER_COND_BIT),
	328	EVENT_FILE_FL_PID_FILTER = (1 << EVENT_FILE_FL_PID_FILTER_BIT),
	329	};
	330
	331	struct trace_event_file {
	332	struct list_head list;
	333	struct trace_event_call *event_call;
	334	struct event_filter *filter;
	335	struct dentry *dir;
	336	struct trace_array *tr;
	337	struct trace_subsystem_dir *system;
	338	struct list_head triggers;
	339
	340	/*
	341	* 32 bit flags:
	342	* bit 0: enabled
	343	* bit 1: enabled cmd record
	344	* bit 2: enable/disable with the soft disable bit
	345	* bit 3: soft disabled
	346	* bit 4: trigger enabled
	347	*
	348	* Note: The bits must be set atomically to prevent races
	349	* from other writers. Reads of flags do not need to be in
	350	* sync as they occur in critical sections. But the way flags
	351	* is currently used, these changes do not affect the code
	352	* except that when a change is made, it may have a slight
	353	* delay in propagating the changes to other CPUs due to
	354	* caching and such. Which is mostly OK ;-)
	355	*/
	356	unsigned long flags;
	357	atomic_t sm_ref; /* soft-mode reference counter */
	358	atomic_t tm_ref; /* trigger-mode reference counter */
	359	};
	360
	361	#define __TRACE_EVENT_FLAGS(name, value) \
	362	static int __init trace_init_flags_##name(void) \
	363	{ \
	364	event_##name.flags \|= value; \
	365	return 0; \
	366	} \
	367	early_initcall(trace_init_flags_##name);
	368
	369	#define __TRACE_EVENT_PERF_PERM(name, expr...) \
	370	static int perf_perm_##name(struct trace_event_call *tp_event, \
	371	struct perf_event *p_event) \
	372	{ \
	373	return ({ expr; }); \
	374	} \
	375	static int __init trace_init_perf_perm_##name(void) \
	376	{ \
	377	event_##name.perf_perm = &perf_perm_##name; \
	378	return 0; \
	379	} \
	380	early_initcall(trace_init_perf_perm_##name);
	381
	382	#define PERF_MAX_TRACE_SIZE 2048
	383
	384	#define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
	385
	386	enum event_trigger_type {
	387	ETT_NONE = (0),
	388	ETT_TRACE_ONOFF = (1 << 0),
	389	ETT_SNAPSHOT = (1 << 1),
	390	ETT_STACKTRACE = (1 << 2),
	391	ETT_EVENT_ENABLE = (1 << 3),
	392	ETT_EVENT_HIST = (1 << 4),
	393	ETT_HIST_ENABLE = (1 << 5),
	394	};
	395
	396	extern int filter_match_preds(struct event_filter filter, void rec);
	397
	398	extern enum event_trigger_type event_triggers_call(struct trace_event_file *file,
	399	void *rec);
	400	extern void event_triggers_post_call(struct trace_event_file *file,
	401	enum event_trigger_type tt,
	402	void *rec);
	403
	404	bool trace_event_ignore_this_pid(struct trace_event_file *trace_file);
	405
	406	/**
	407	* trace_trigger_soft_disabled - do triggers and test if soft disabled
	408	* @file: The file pointer of the event to test
	409	*
	410	* If any triggers without filters are attached to this event, they
	411	* will be called here. If the event is soft disabled and has no
	412	* triggers that require testing the fields, it will return true,
	413	* otherwise false.
	414	*/
	415	static inline bool
	416	trace_trigger_soft_disabled(struct trace_event_file *file)
	417	{
	418	unsigned long eflags = file->flags;
	419
	420	if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
	421	if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
	422	event_triggers_call(file, NULL);
	423	if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
	424	return true;
	425	if (eflags & EVENT_FILE_FL_PID_FILTER)
	426	return trace_event_ignore_this_pid(file);
	427	}
	428	return false;
	429	}
	430
	431	#ifdef CONFIG_BPF_EVENTS
	432	unsigned int trace_call_bpf(struct bpf_prog prog, void ctx);
	433	#else
	434	static inline unsigned int trace_call_bpf(struct bpf_prog prog, void ctx)
	435	{
	436	return 1;
	437	}
	438	#endif
	439
	440	enum {
	441	FILTER_OTHER = 0,
	442	FILTER_STATIC_STRING,
	443	FILTER_DYN_STRING,
	444	FILTER_PTR_STRING,
	445	FILTER_TRACE_FN,
	446	FILTER_COMM,
	447	FILTER_CPU,
	448	};
	449
	450	extern int trace_event_raw_init(struct trace_event_call *call);
	451	extern int trace_define_field(struct trace_event_call call, const char type,
	452	const char *name, int offset, int size,
	453	int is_signed, int filter_type);
	454	extern int trace_add_event_call(struct trace_event_call *call);
	455	extern int trace_remove_event_call(struct trace_event_call *call);
	456	extern int trace_event_get_offsets(struct trace_event_call *call);
	457
	458	#define is_signed_type(type) (((type)(-1)) < (type)1)
	459
	460	int trace_set_clr_event(const char system, const char event, int set);
	461
	462	/*
	463	* The double __builtin_constant_p is because gcc will give us an error
	464	* if we try to allocate the static variable to fmt if it is not a
	465	* constant. Even with the outer if statement optimizing out.
	466	*/
	467	#define event_trace_printk(ip, fmt, args...) \
	468	do { \
	469	__trace_printk_check_format(fmt, ##args); \
	470	tracing_record_cmdline(current); \
	471	if (__builtin_constant_p(fmt)) { \
	472	static const char *trace_printk_fmt \
	473	__attribute__((section("__trace_printk_fmt"))) = \
	474	__builtin_constant_p(fmt) ? fmt : NULL; \
	475	\
	476	__trace_bprintk(ip, trace_printk_fmt, ##args); \
	477	} else \
	478	__trace_printk(ip, fmt, ##args); \
	479	} while (0)
	480
	481	#ifdef CONFIG_PERF_EVENTS
	482	struct perf_event;
	483
	484	DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
	485
	486	extern int perf_trace_init(struct perf_event *event);
	487	extern void perf_trace_destroy(struct perf_event *event);
	488	extern int perf_trace_add(struct perf_event *event, int flags);
	489	extern void perf_trace_del(struct perf_event *event, int flags);
	490	extern int ftrace_profile_set_filter(struct perf_event *event, int event_id,
	491	char *filter_str);
	492	extern void ftrace_profile_free_filter(struct perf_event *event);
	493	void perf_trace_buf_update(void *record, u16 type);
	494	void perf_trace_buf_alloc(int size, struct pt_regs regs, int rctxp);
	495
	496	void perf_trace_run_bpf_submit(void *raw_data, int size, int rctx,
	497	struct trace_event_call *call, u64 count,
	498	struct pt_regs regs, struct hlist_head head,
	499	struct task_struct *task);
	500
	501	static inline void
	502	perf_trace_buf_submit(void *raw_data, int size, int rctx, u16 type,
	503	u64 count, struct pt_regs regs, void head,
	504	struct task_struct *task)
	505	{
	506	perf_tp_event(type, count, raw_data, size, regs, head, rctx, task);
	507	}
	508	#endif
	509
	510	#endif /* _LINUX_TRACE_EVENT_H */