include/linux/trace_events.h - kernel/msm-4.19 - Gitiles


 #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,
 				bool concatenate);

 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 */

	#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,
	bool concatenate);

	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 */