[net-next-2.6.git] / include / linux / ftrace_event.h

#ifndef _LINUX_FTRACE_EVENT_H
#define _LINUX_FTRACE_EVENT_H

#include <linux/trace_seq.h>
#include <linux/ring_buffer.h>


struct trace_array;
struct tracer;
struct dentry;

/*
 * 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;
	int			tgid;
};

#define FTRACE_MAX_EVENT						\
	((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;
	void			*private;
	int			cpu_file;
	struct mutex		mutex;
	struct ring_buffer_iter	*buffer_iter[NR_CPUS];

	/* The below is zeroed out in pipe_read */
	struct trace_seq	seq;
	struct trace_entry	*ent;
	int			cpu;
	u64			ts;

	unsigned long		iter_flags;
	loff_t			pos;
	long			idx;

	cpumask_var_t		started;
};


typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
					      int flags);
struct trace_event {
	struct hlist_node	node;
	struct list_head	list;
	int			type;
	trace_print_func	trace;
	trace_print_func	raw;
	trace_print_func	hex;
	trace_print_func	binary;
};

extern int register_ftrace_event(struct trace_event *event);
extern int unregister_ftrace_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 */
};


struct ring_buffer_event *
trace_current_buffer_lock_reserve(int type, unsigned long len,
				  unsigned long flags, int pc);
void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
					unsigned long flags, int pc);
void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event,
					unsigned long flags, int pc);
void trace_current_buffer_discard_commit(struct ring_buffer_event *event);

void tracing_record_cmdline(struct task_struct *tsk);

struct ftrace_event_call {
	struct list_head	list;
	char			*name;
	char			*system;
	struct dentry		*dir;
	struct trace_event	*event;
	int			enabled;
	int			(*regfunc)(void);
	void			(*unregfunc)(void);
	int			id;
	int			(*raw_init)(void);
	int			(*show_format)(struct trace_seq *s);
	int			(*define_fields)(void);
	struct list_head	fields;
	int			filter_active;
	void			*filter;
	void			*mod;

#ifdef CONFIG_EVENT_PROFILE
	atomic_t	profile_count;
	int		(*profile_enable)(struct ftrace_event_call *);
	void		(*profile_disable)(struct ftrace_event_call *);
#endif
};

#define MAX_FILTER_PRED		32
#define MAX_FILTER_STR_VAL	128

extern int init_preds(struct ftrace_event_call *call);
extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
extern int filter_current_check_discard(struct ftrace_event_call *call,
					void *rec,
					struct ring_buffer_event *event);

extern int trace_define_field(struct ftrace_event_call *call, char *type,
			      char *name, int offset, int size, int is_signed);

#define is_signed_type(type)	(((type)(-1)) < 0)

/*
 * 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)

#define __common_field(type, item, is_signed)				\
	ret = trace_define_field(event_call, #type, "common_" #item,	\
				 offsetof(typeof(field.ent), item),	\
				 sizeof(field.ent.item), is_signed);	\
	if (ret)							\
		return ret;

#endif /* _LINUX_FTRACE_EVENT_H */
Commit	Line	Data
97f20251 SR	1	#ifndef _LINUX_FTRACE_EVENT_H
	2	#define _LINUX_FTRACE_EVENT_H
	3
	4	#include <linux/trace_seq.h>
	5	#include <linux/ring_buffer.h>
	6
	7
	8	struct trace_array;
	9	struct tracer;
6d723736	10	struct dentry;
97f20251 SR	11
	12	/*
	13	* The trace entry - the most basic unit of tracing. This is what
	14	* is printed in the end as a single line in the trace output, such as:
	15	*
	16	* bash-15816 [01] 235.197585: idle_cpu <- irq_enter
	17	*/
	18	struct trace_entry {
89ec0dee	19	unsigned short type;
97f20251 SR	20	unsigned char flags;
	21	unsigned char preempt_count;
	22	int pid;
	23	int tgid;
	24	};
	25
89ec0dee SR	26	#define FTRACE_MAX_EVENT \
	27	((1 << (sizeof(((struct trace_entry )0)->type) 8)) - 1)
	28
97f20251 SR	29	/*
	30	* Trace iterator - used by printout routines who present trace
	31	* results to users and which routines might sleep, etc:
	32	*/
	33	struct trace_iterator {
	34	struct trace_array *tr;
	35	struct tracer *trace;
	36	void *private;
	37	int cpu_file;
	38	struct mutex mutex;
	39	struct ring_buffer_iter *buffer_iter[NR_CPUS];
	40
	41	/* The below is zeroed out in pipe_read */
	42	struct trace_seq seq;
	43	struct trace_entry *ent;
	44	int cpu;
	45	u64 ts;
	46
	47	unsigned long iter_flags;
	48	loff_t pos;
	49	long idx;
	50
	51	cpumask_var_t started;
	52	};
	53
	54
	55	typedef enum print_line_t (trace_print_func)(struct trace_iterator iter,
	56	int flags);
	57	struct trace_event {
	58	struct hlist_node node;
060fa5c8	59	struct list_head list;
97f20251 SR	60	int type;
	61	trace_print_func trace;
	62	trace_print_func raw;
	63	trace_print_func hex;
	64	trace_print_func binary;
	65	};
	66
	67	extern int register_ftrace_event(struct trace_event *event);
	68	extern int unregister_ftrace_event(struct trace_event *event);
	69
	70	/* Return values for print_line callback */
	71	enum print_line_t {
	72	TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
	73	TRACE_TYPE_HANDLED = 1,
	74	TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
	75	TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
	76	};
	77
	78
	79	struct ring_buffer_event *
7a4f453b	80	trace_current_buffer_lock_reserve(int type, unsigned long len,
97f20251 SR	81	unsigned long flags, int pc);
	82	void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
	83	unsigned long flags, int pc);
	84	void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event,
	85	unsigned long flags, int pc);
	86	void trace_current_buffer_discard_commit(struct ring_buffer_event *event);
	87
	88	void tracing_record_cmdline(struct task_struct *tsk);
	89
	90	struct ftrace_event_call {
a59fd602	91	struct list_head list;
97f20251 SR	92	char *name;
	93	char *system;
	94	struct dentry *dir;
6d723736	95	struct trace_event *event;
97f20251 SR	96	int enabled;
	97	int (*regfunc)(void);
	98	void (*unregfunc)(void);
	99	int id;
	100	int (*raw_init)(void);
	101	int (show_format)(struct trace_seq s);
	102	int (*define_fields)(void);
	103	struct list_head fields;
30e673b2 TZ	104	int filter_active;
30e673b2 TZ	105	void *filter;
6d723736	106	void *mod;
97f20251 SR	107
	108	#ifdef CONFIG_EVENT_PROFILE
	109	atomic_t profile_count;
	110	int (profile_enable)(struct ftrace_event_call );
	111	void (profile_disable)(struct ftrace_event_call );
	112	#endif
	113	};
	114
8b372562	115	#define MAX_FILTER_PRED 32
97f20251 SR	116	#define MAX_FILTER_STR_VAL 128
	117
	118	extern int init_preds(struct ftrace_event_call *call);
	119	extern int filter_match_preds(struct ftrace_event_call call, void rec);
	120	extern int filter_current_check_discard(struct ftrace_event_call *call,
	121	void *rec,
	122	struct ring_buffer_event *event);
	123
	124	extern int trace_define_field(struct ftrace_event_call call, char type,
a118e4d1	125	char *name, int offset, int size, int is_signed);
97f20251	126
a118e4d1	127	#define is_signed_type(type) (((type)(-1)) < 0)
97f20251 SR	128
	129	/*
	130	* The double __builtin_constant_p is because gcc will give us an error
	131	* if we try to allocate the static variable to fmt if it is not a
	132	* constant. Even with the outer if statement optimizing out.
	133	*/
	134	#define event_trace_printk(ip, fmt, args...) \
	135	do { \
	136	__trace_printk_check_format(fmt, ##args); \
	137	tracing_record_cmdline(current); \
	138	if (__builtin_constant_p(fmt)) { \
	139	static const char *trace_printk_fmt \
	140	__attribute__((section("__trace_printk_fmt"))) = \
	141	__builtin_constant_p(fmt) ? fmt : NULL; \
	142	\
	143	__trace_bprintk(ip, trace_printk_fmt, ##args); \
	144	} else \
	145	__trace_printk(ip, fmt, ##args); \
	146	} while (0)
	147
a118e4d1	148	#define __common_field(type, item, is_signed) \
97f20251 SR	149	ret = trace_define_field(event_call, #type, "common_" #item, \
97f20251 SR	150	offsetof(typeof(field.ent), item), \
a118e4d1	151	sizeof(field.ent.item), is_signed); \
97f20251 SR	152	if (ret) \
	153	return ret;
	154
	155	#endif /* _LINUX_FTRACE_EVENT_H */