[lttng-modules.git] / ltt-events.h

#ifndef _LTT_EVENTS_H
#define _LTT_EVENTS_H

/*
 * ltt-events.h
 *
 * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Holds LTTng per-session event registry.
 *
 * Dual LGPL v2.1/GPL v2 license.
 */

#include <linux/list.h>
#include <linux/kprobes.h>
#include "wrapper/uuid.h"
#include "ltt-debugfs-abi.h"

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

struct ltt_channel;
struct ltt_session;
struct lib_ring_buffer_ctx;
struct perf_event;
struct perf_event_attr;

/* Type description */

/* Update the astract_types name table in lttng-types.c along with this enum */
enum abstract_types {
	atype_integer,
	atype_enum,
	atype_array,
	atype_sequence,
	atype_string,
	NR_ABSTRACT_TYPES,
};

/* Update the string_encodings name table in lttng-types.c along with this enum */
enum lttng_string_encodings {
	lttng_encode_none = 0,
	lttng_encode_UTF8 = 1,
	lttng_encode_ASCII = 2,
	NR_STRING_ENCODINGS,
};

struct lttng_enum_entry {
	unsigned long long start, end;	/* start and end are inclusive */
	const char *string;
};

#define __type_integer(_type, _byte_order, _base, _encoding)	\
	{							\
	    .atype = atype_integer,				\
	    .u.basic.integer =					\
		{						\
		  .size = sizeof(_type) * CHAR_BIT,		\
		  .alignment = ltt_alignof(_type) * CHAR_BIT,	\
		  .signedness = is_signed_type(_type),		\
		  .reverse_byte_order = _byte_order != __BYTE_ORDER,	\
		  .base = _base,				\
		  .encoding = lttng_encode_##_encoding,		\
		},						\
	}							\

struct lttng_integer_type {
	unsigned int size;		/* in bits */
	unsigned short alignment;	/* in bits */
	unsigned int signedness:1;
	unsigned int reverse_byte_order:1;
	unsigned int base;		/* 2, 8, 10, 16, for pretty print */
	enum lttng_string_encodings encoding;
};

union _lttng_basic_type {
	struct lttng_integer_type integer;
	struct {
		const char *name;
	} enumeration;
	struct {
		enum lttng_string_encodings encoding;
	} string;
};

struct lttng_basic_type {
	enum abstract_types atype;
	union {
		union _lttng_basic_type basic;
	} u;
};

struct lttng_type {
	enum abstract_types atype;
	union {
		union _lttng_basic_type basic;
		struct {
			struct lttng_basic_type elem_type;
			unsigned int length;		/* num. elems. */
		} array;
		struct {
			struct lttng_basic_type length_type;
			struct lttng_basic_type elem_type;
		} sequence;
	} u;
};

struct lttng_enum {
	const char *name;
	struct lttng_type container_type;
	const struct lttng_enum_entry *entries;
	unsigned int len;
};

/* Event field description */

struct lttng_event_field {
	const char *name;
	struct lttng_type type;
};

/*
 * We need to keep this perf counter field separately from struct
 * lttng_ctx_field because cpu hotplug needs fixed-location addresses.
 */
struct lttng_perf_counter_field {
	struct notifier_block nb;
	int hp_enable;
	struct perf_event_attr *attr;
	struct perf_event **e;	/* per-cpu array */
};

struct lttng_ctx_field {
	struct lttng_event_field event_field;
	size_t (*get_size)(size_t offset);
	void (*record)(struct lttng_ctx_field *field,
		       struct lib_ring_buffer_ctx *ctx,
		       struct ltt_channel *chan);
	union {
		struct lttng_perf_counter_field *perf_counter;
	} u;
	void (*destroy)(struct lttng_ctx_field *field);
};

struct lttng_ctx {
	struct lttng_ctx_field *fields;
	unsigned int nr_fields;
	unsigned int allocated_fields;
};

struct lttng_event_desc {
	const char *name;
	void *probe_callback;
	const struct lttng_event_ctx *ctx;	/* context */
	const struct lttng_event_field *fields;	/* event payload */
	unsigned int nr_fields;
	struct module *owner;
};

struct lttng_probe_desc {
	const struct lttng_event_desc **event_desc;
	unsigned int nr_events;
	struct list_head head;			/* chain registered probes */
};

struct lttng_krp;				/* Kretprobe handling */

/*
 * ltt_event structure is referred to by the tracing fast path. It must be
 * kept small.
 */
struct ltt_event {
	unsigned int id;
	struct ltt_channel *chan;
	int enabled;
	const struct lttng_event_desc *desc;
	void *filter;
	struct lttng_ctx *ctx;
	enum lttng_kernel_instrumentation instrumentation;
	union {
		struct {
			struct kprobe kp;
			char *symbol_name;
		} kprobe;
		struct {
			struct lttng_krp *lttng_krp;
			char *symbol_name;
		} kretprobe;
		struct {
			char *symbol_name;
		} ftrace;
	} u;
	struct list_head list;		/* Event list */
	int metadata_dumped:1;
};

struct ltt_channel_ops {
	struct channel *(*channel_create)(const char *name,
				struct ltt_channel *ltt_chan,
				void *buf_addr,
				size_t subbuf_size, size_t num_subbuf,
				unsigned int switch_timer_interval,
				unsigned int read_timer_interval);
	void (*channel_destroy)(struct channel *chan);
	struct lib_ring_buffer *(*buffer_read_open)(struct channel *chan);
	int (*buffer_has_read_closed_stream)(struct channel *chan);
	void (*buffer_read_close)(struct lib_ring_buffer *buf);
	int (*event_reserve)(struct lib_ring_buffer_ctx *ctx,
			     uint32_t event_id);
	void (*event_commit)(struct lib_ring_buffer_ctx *ctx);
	void (*event_write)(struct lib_ring_buffer_ctx *ctx, const void *src,
			    size_t len);
	void (*event_write_from_user)(struct lib_ring_buffer_ctx *ctx,
				      const void *src, size_t len);
	void (*event_memset)(struct lib_ring_buffer_ctx *ctx,
			     int c, size_t len);
	/*
	 * packet_avail_size returns the available size in the current
	 * packet. Note that the size returned is only a hint, since it
	 * may change due to concurrent writes.
	 */
	size_t (*packet_avail_size)(struct channel *chan);
	wait_queue_head_t *(*get_writer_buf_wait_queue)(struct channel *chan, int cpu);
	wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
	int (*is_finalized)(struct channel *chan);
	int (*is_disabled)(struct channel *chan);
};

struct ltt_transport {
	char *name;
	struct module *owner;
	struct list_head node;
	struct ltt_channel_ops ops;
};

struct ltt_channel {
	unsigned int id;
	struct channel *chan;		/* Channel buffers */
	int enabled;
	struct lttng_ctx *ctx;
	/* Event ID management */
	struct ltt_session *session;
	struct file *file;		/* File associated to channel */
	unsigned int free_event_id;	/* Next event ID to allocate */
	struct list_head list;		/* Channel list */
	struct ltt_channel_ops *ops;
	struct ltt_transport *transport;
	struct ltt_event **sc_table;	/* for syscall tracing */
	struct ltt_event **compat_sc_table;
	struct ltt_event *sc_unknown;	/* for unknown syscalls */
	struct ltt_event *sc_compat_unknown;
	struct ltt_event *sc_exit;	/* for syscall exit */
	int header_type;		/* 0: unset, 1: compact, 2: large */
	int metadata_dumped:1;
};

struct ltt_session {
	int active;			/* Is trace session active ? */
	int been_active;		/* Has trace session been active ? */
	struct file *file;		/* File associated to session */
	struct ltt_channel *metadata;	/* Metadata channel */
	struct list_head chan;		/* Channel list head */
	struct list_head events;	/* Event list head */
	struct list_head list;		/* Session list */
	unsigned int free_chan_id;	/* Next chan ID to allocate */
	uuid_le uuid;			/* Trace session unique ID */
	int metadata_dumped:1;
};

struct trace_syscall_entry {
	void *func;
	const struct lttng_event_desc *desc;
	const struct lttng_event_field *fields;
	unsigned int nrargs;
};

struct ltt_session *ltt_session_create(void);
int ltt_session_enable(struct ltt_session *session);
int ltt_session_disable(struct ltt_session *session);
void ltt_session_destroy(struct ltt_session *session);

struct ltt_channel *ltt_channel_create(struct ltt_session *session,
				       const char *transport_name,
				       void *buf_addr,
				       size_t subbuf_size, size_t num_subbuf,
				       unsigned int switch_timer_interval,
				       unsigned int read_timer_interval);
struct ltt_channel *ltt_global_channel_create(struct ltt_session *session,
				       int overwrite, void *buf_addr,
				       size_t subbuf_size, size_t num_subbuf,
				       unsigned int switch_timer_interval,
				       unsigned int read_timer_interval);

struct ltt_event *ltt_event_create(struct ltt_channel *chan,
				   struct lttng_kernel_event *event_param,
				   void *filter,
				   const struct lttng_event_desc *internal_desc);

int ltt_channel_enable(struct ltt_channel *channel);
int ltt_channel_disable(struct ltt_channel *channel);
int ltt_event_enable(struct ltt_event *event);
int ltt_event_disable(struct ltt_event *event);

void ltt_transport_register(struct ltt_transport *transport);
void ltt_transport_unregister(struct ltt_transport *transport);

void synchronize_trace(void);
int ltt_debugfs_abi_init(void);
void ltt_debugfs_abi_exit(void);

int ltt_probe_register(struct lttng_probe_desc *desc);
void ltt_probe_unregister(struct lttng_probe_desc *desc);
const struct lttng_event_desc *ltt_event_get(const char *name);
void ltt_event_put(const struct lttng_event_desc *desc);
int ltt_probes_init(void);
void ltt_probes_exit(void);

#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
int lttng_syscalls_register(struct ltt_channel *chan, void *filter);
int lttng_syscalls_unregister(struct ltt_channel *chan);
#else
static inline int lttng_syscalls_register(struct ltt_channel *chan, void *filter)
{
	return -ENOSYS;
}

static inline int lttng_syscalls_unregister(struct ltt_channel *chan)
{
	return 0;
}
#endif

struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx);
int lttng_find_context(struct lttng_ctx *ctx, const char *name);
void lttng_remove_context_field(struct lttng_ctx **ctx,
				struct lttng_ctx_field *field);
void lttng_destroy_context(struct lttng_ctx *ctx);
int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
int lttng_add_comm_to_ctx(struct lttng_ctx **ctx);
int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
#if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
int lttng_add_perf_counter_to_ctx(uint32_t type,
				  uint64_t config,
				  const char *name,
				  struct lttng_ctx **ctx);
#else
static inline
int lttng_add_perf_counter_to_ctx(uint32_t type,
				  uint64_t config,
				  const char *name,
				  struct lttng_ctx **ctx)
{
	return -ENOSYS;
}
#endif

#ifdef CONFIG_KPROBES
int lttng_kprobes_register(const char *name,
		const char *symbol_name,
		uint64_t offset,
		uint64_t addr,
		struct ltt_event *event);
void lttng_kprobes_unregister(struct ltt_event *event);
void lttng_kprobes_destroy_private(struct ltt_event *event);
#else
static inline
int lttng_kprobes_register(const char *name,
		const char *symbol_name,
		uint64_t offset,
		uint64_t addr,
		struct ltt_event *event)
{
	return -ENOSYS;
}

static inline
void lttng_kprobes_unregister(struct ltt_event *event)
{
}

static inline
void lttng_kprobes_destroy_private(struct ltt_event *event)
{
}
#endif

#ifdef CONFIG_KRETPROBES
int lttng_kretprobes_register(const char *name,
		const char *symbol_name,
		uint64_t offset,
		uint64_t addr,
		struct ltt_event *event_entry,
		struct ltt_event *event_exit);
void lttng_kretprobes_unregister(struct ltt_event *event);
void lttng_kretprobes_destroy_private(struct ltt_event *event);
#else
static inline
int lttng_kretprobes_register(const char *name,
		const char *symbol_name,
		uint64_t offset,
		uint64_t addr,
		struct ltt_event *event_entry,
		struct ltt_event *event_exit)
{
	return -ENOSYS;
}

static inline
void lttng_kretprobes_unregister(struct ltt_event *event)
{
}

static inline
void lttng_kretprobes_destroy_private(struct ltt_event *event)
{
}
#endif

#ifdef CONFIG_DYNAMIC_FTRACE
int lttng_ftrace_register(const char *name,
			  const char *symbol_name,
			  struct ltt_event *event);
void lttng_ftrace_unregister(struct ltt_event *event);
void lttng_ftrace_destroy_private(struct ltt_event *event);
#else
static inline
int lttng_ftrace_register(const char *name,
			  const char *symbol_name,
			  struct ltt_event *event)
{
	return -ENOSYS;
}

static inline
void lttng_ftrace_unregister(struct ltt_event *event)
{
}

static inline
void lttng_ftrace_destroy_private(struct ltt_event *event)
{
}
#endif

int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);

extern const struct file_operations lttng_tracepoint_list_fops;

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
#define TRACEPOINT_HAS_DATA_ARG
#endif

#endif /* _LTT_EVENTS_H */
Commit	Line	Data
	1	#ifndef _LTT_EVENTS_H
	2	#define _LTT_EVENTS_H
	3
	4	/*
	5	* ltt-events.h
	6	*
	7	* Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	8	*
	9	* Holds LTTng per-session event registry.
	10	*
	11	* Dual LGPL v2.1/GPL v2 license.
	12	*/
	13
	14	#include <linux/list.h>
	15	#include <linux/kprobes.h>
	16	#include "wrapper/uuid.h"
	17	#include "ltt-debugfs-abi.h"
	18
	19	#undef is_signed_type
	20	#define is_signed_type(type) (((type)(-1)) < 0)
	21
	22	struct ltt_channel;
	23	struct ltt_session;
	24	struct lib_ring_buffer_ctx;
	25	struct perf_event;
	26	struct perf_event_attr;
	27
	28	/* Type description */
	29
	30	/* Update the astract_types name table in lttng-types.c along with this enum */
	31	enum abstract_types {
	32	atype_integer,
	33	atype_enum,
	34	atype_array,
	35	atype_sequence,
	36	atype_string,
	37	NR_ABSTRACT_TYPES,
	38	};
	39
	40	/* Update the string_encodings name table in lttng-types.c along with this enum */
	41	enum lttng_string_encodings {
	42	lttng_encode_none = 0,
	43	lttng_encode_UTF8 = 1,
	44	lttng_encode_ASCII = 2,
	45	NR_STRING_ENCODINGS,
	46	};
	47
	48	struct lttng_enum_entry {
	49	unsigned long long start, end; /* start and end are inclusive */
	50	const char *string;
	51	};
	52
	53	#define __type_integer(_type, _byte_order, _base, _encoding) \
	54	{ \
	55	.atype = atype_integer, \
	56	.u.basic.integer = \
	57	{ \
	58	.size = sizeof(_type) * CHAR_BIT, \
	59	.alignment = ltt_alignof(_type) * CHAR_BIT, \
	60	.signedness = is_signed_type(_type), \
	61	.reverse_byte_order = _byte_order != __BYTE_ORDER, \
	62	.base = _base, \
	63	.encoding = lttng_encode_##_encoding, \
	64	}, \
	65	} \
	66
	67	struct lttng_integer_type {
	68	unsigned int size; /* in bits */
	69	unsigned short alignment; /* in bits */
	70	unsigned int signedness:1;
	71	unsigned int reverse_byte_order:1;
	72	unsigned int base; /* 2, 8, 10, 16, for pretty print */
	73	enum lttng_string_encodings encoding;
	74	};
	75
	76	union _lttng_basic_type {
	77	struct lttng_integer_type integer;
	78	struct {
	79	const char *name;
	80	} enumeration;
	81	struct {
	82	enum lttng_string_encodings encoding;
	83	} string;
	84	};
	85
	86	struct lttng_basic_type {
	87	enum abstract_types atype;
	88	union {
	89	union _lttng_basic_type basic;
	90	} u;
	91	};
	92
	93	struct lttng_type {
	94	enum abstract_types atype;
	95	union {
	96	union _lttng_basic_type basic;
	97	struct {
	98	struct lttng_basic_type elem_type;
	99	unsigned int length; /* num. elems. */
	100	} array;
	101	struct {
	102	struct lttng_basic_type length_type;
	103	struct lttng_basic_type elem_type;
	104	} sequence;
	105	} u;
	106	};
	107
	108	struct lttng_enum {
	109	const char *name;
	110	struct lttng_type container_type;
	111	const struct lttng_enum_entry *entries;
	112	unsigned int len;
	113	};
	114
	115	/* Event field description */
	116
	117	struct lttng_event_field {
	118	const char *name;
	119	struct lttng_type type;
	120	};
	121
	122	/*
	123	* We need to keep this perf counter field separately from struct
	124	* lttng_ctx_field because cpu hotplug needs fixed-location addresses.
	125	*/
	126	struct lttng_perf_counter_field {
	127	struct notifier_block nb;
	128	int hp_enable;
	129	struct perf_event_attr *attr;
	130	struct perf_event *e; / per-cpu array */
	131	};
	132
	133	struct lttng_ctx_field {
	134	struct lttng_event_field event_field;
	135	size_t (*get_size)(size_t offset);
	136	void (record)(struct lttng_ctx_field field,
	137	struct lib_ring_buffer_ctx *ctx,
	138	struct ltt_channel *chan);
	139	union {
	140	struct lttng_perf_counter_field *perf_counter;
	141	} u;
	142	void (destroy)(struct lttng_ctx_field field);
	143	};
	144
	145	struct lttng_ctx {
	146	struct lttng_ctx_field *fields;
	147	unsigned int nr_fields;
	148	unsigned int allocated_fields;
	149	};
	150
	151	struct lttng_event_desc {
	152	const char *name;
	153	void *probe_callback;
	154	const struct lttng_event_ctx ctx; / context */
	155	const struct lttng_event_field fields; / event payload */
	156	unsigned int nr_fields;
	157	struct module *owner;
	158	};
	159
	160	struct lttng_probe_desc {
	161	const struct lttng_event_desc **event_desc;
	162	unsigned int nr_events;
	163	struct list_head head; /* chain registered probes */
	164	};
	165
	166	struct lttng_krp; /* Kretprobe handling */
	167
	168	/*
	169	* ltt_event structure is referred to by the tracing fast path. It must be
	170	* kept small.
	171	*/
	172	struct ltt_event {
	173	unsigned int id;
	174	struct ltt_channel *chan;
	175	int enabled;
	176	const struct lttng_event_desc *desc;
	177	void *filter;
	178	struct lttng_ctx *ctx;
	179	enum lttng_kernel_instrumentation instrumentation;
	180	union {
	181	struct {
	182	struct kprobe kp;
	183	char *symbol_name;
	184	} kprobe;
	185	struct {
	186	struct lttng_krp *lttng_krp;
	187	char *symbol_name;
	188	} kretprobe;
	189	struct {
	190	char *symbol_name;
	191	} ftrace;
	192	} u;
	193	struct list_head list; /* Event list */
	194	int metadata_dumped:1;
	195	};
	196
	197	struct ltt_channel_ops {
	198	struct channel (channel_create)(const char *name,
	199	struct ltt_channel *ltt_chan,
	200	void *buf_addr,
	201	size_t subbuf_size, size_t num_subbuf,
	202	unsigned int switch_timer_interval,
	203	unsigned int read_timer_interval);
	204	void (channel_destroy)(struct channel chan);
	205	struct lib_ring_buffer (buffer_read_open)(struct channel *chan);
	206	int (buffer_has_read_closed_stream)(struct channel chan);
	207	void (buffer_read_close)(struct lib_ring_buffer buf);
	208	int (event_reserve)(struct lib_ring_buffer_ctx ctx,
	209	uint32_t event_id);
	210	void (event_commit)(struct lib_ring_buffer_ctx ctx);
	211	void (event_write)(struct lib_ring_buffer_ctx ctx, const void *src,
	212	size_t len);
	213	void (event_write_from_user)(struct lib_ring_buffer_ctx ctx,
	214	const void *src, size_t len);
	215	void (event_memset)(struct lib_ring_buffer_ctx ctx,
	216	int c, size_t len);
	217	/*
	218	* packet_avail_size returns the available size in the current
	219	* packet. Note that the size returned is only a hint, since it
	220	* may change due to concurrent writes.
	221	*/
	222	size_t (packet_avail_size)(struct channel chan);
	223	wait_queue_head_t (get_writer_buf_wait_queue)(struct channel *chan, int cpu);
	224	wait_queue_head_t (get_hp_wait_queue)(struct channel *chan);
	225	int (is_finalized)(struct channel chan);
	226	int (is_disabled)(struct channel chan);
	227	};
	228
	229	struct ltt_transport {
	230	char *name;
	231	struct module *owner;
	232	struct list_head node;
	233	struct ltt_channel_ops ops;
	234	};
	235
	236	struct ltt_channel {
	237	unsigned int id;
	238	struct channel chan; / Channel buffers */
	239	int enabled;
	240	struct lttng_ctx *ctx;
	241	/* Event ID management */
	242	struct ltt_session *session;
	243	struct file file; / File associated to channel */
	244	unsigned int free_event_id; /* Next event ID to allocate */
	245	struct list_head list; /* Channel list */
	246	struct ltt_channel_ops *ops;
	247	struct ltt_transport *transport;
	248	struct ltt_event *sc_table; / for syscall tracing */
	249	struct ltt_event **compat_sc_table;
	250	struct ltt_event sc_unknown; / for unknown syscalls */
	251	struct ltt_event *sc_compat_unknown;
	252	struct ltt_event sc_exit; / for syscall exit */
	253	int header_type; /* 0: unset, 1: compact, 2: large */
	254	int metadata_dumped:1;
	255	};
	256
	257	struct ltt_session {
	258	int active; /* Is trace session active ? */
	259	int been_active; /* Has trace session been active ? */
	260	struct file file; / File associated to session */
	261	struct ltt_channel metadata; / Metadata channel */
	262	struct list_head chan; /* Channel list head */
	263	struct list_head events; /* Event list head */
	264	struct list_head list; /* Session list */
	265	unsigned int free_chan_id; /* Next chan ID to allocate */
	266	uuid_le uuid; /* Trace session unique ID */
	267	int metadata_dumped:1;
	268	};
	269
	270	struct trace_syscall_entry {
	271	void *func;
	272	const struct lttng_event_desc *desc;
	273	const struct lttng_event_field *fields;
	274	unsigned int nrargs;
	275	};
	276
	277	struct ltt_session *ltt_session_create(void);
	278	int ltt_session_enable(struct ltt_session *session);
	279	int ltt_session_disable(struct ltt_session *session);
	280	void ltt_session_destroy(struct ltt_session *session);
	281
	282	struct ltt_channel ltt_channel_create(struct ltt_session session,
	283	const char *transport_name,
	284	void *buf_addr,
	285	size_t subbuf_size, size_t num_subbuf,
	286	unsigned int switch_timer_interval,
	287	unsigned int read_timer_interval);
	288	struct ltt_channel ltt_global_channel_create(struct ltt_session session,
	289	int overwrite, void *buf_addr,
	290	size_t subbuf_size, size_t num_subbuf,
	291	unsigned int switch_timer_interval,
	292	unsigned int read_timer_interval);
	293
	294	struct ltt_event ltt_event_create(struct ltt_channel chan,
	295	struct lttng_kernel_event *event_param,
	296	void *filter,
	297	const struct lttng_event_desc *internal_desc);
	298
	299	int ltt_channel_enable(struct ltt_channel *channel);
	300	int ltt_channel_disable(struct ltt_channel *channel);
	301	int ltt_event_enable(struct ltt_event *event);
	302	int ltt_event_disable(struct ltt_event *event);
	303
	304	void ltt_transport_register(struct ltt_transport *transport);
	305	void ltt_transport_unregister(struct ltt_transport *transport);
	306
	307	void synchronize_trace(void);
	308	int ltt_debugfs_abi_init(void);
	309	void ltt_debugfs_abi_exit(void);
	310
	311	int ltt_probe_register(struct lttng_probe_desc *desc);
	312	void ltt_probe_unregister(struct lttng_probe_desc *desc);
	313	const struct lttng_event_desc ltt_event_get(const char name);
	314	void ltt_event_put(const struct lttng_event_desc *desc);
	315	int ltt_probes_init(void);
	316	void ltt_probes_exit(void);
	317
	318	#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
	319	int lttng_syscalls_register(struct ltt_channel chan, void filter);
	320	int lttng_syscalls_unregister(struct ltt_channel *chan);
	321	#else
	322	static inline int lttng_syscalls_register(struct ltt_channel chan, void filter)
	323	{
	324	return -ENOSYS;
	325	}
	326
	327	static inline int lttng_syscalls_unregister(struct ltt_channel *chan)
	328	{
	329	return 0;
	330	}
	331	#endif
	332
	333	struct lttng_ctx_field lttng_append_context(struct lttng_ctx *ctx);
	334	int lttng_find_context(struct lttng_ctx ctx, const char name);
	335	void lttng_remove_context_field(struct lttng_ctx **ctx,
	336	struct lttng_ctx_field *field);
	337	void lttng_destroy_context(struct lttng_ctx *ctx);
	338	int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
	339	int lttng_add_comm_to_ctx(struct lttng_ctx **ctx);
	340	int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
	341	int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
	342	int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
	343	int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
	344	int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
	345	int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
	346	int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
	347	#if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
	348	int lttng_add_perf_counter_to_ctx(uint32_t type,
	349	uint64_t config,
	350	const char *name,
	351	struct lttng_ctx **ctx);
	352	#else
	353	static inline
	354	int lttng_add_perf_counter_to_ctx(uint32_t type,
	355	uint64_t config,
	356	const char *name,
	357	struct lttng_ctx **ctx)
	358	{
	359	return -ENOSYS;
	360	}
	361	#endif
	362
	363	#ifdef CONFIG_KPROBES
	364	int lttng_kprobes_register(const char *name,
	365	const char *symbol_name,
	366	uint64_t offset,
	367	uint64_t addr,
	368	struct ltt_event *event);
	369	void lttng_kprobes_unregister(struct ltt_event *event);
	370	void lttng_kprobes_destroy_private(struct ltt_event *event);
	371	#else
	372	static inline
	373	int lttng_kprobes_register(const char *name,
	374	const char *symbol_name,
	375	uint64_t offset,
	376	uint64_t addr,
	377	struct ltt_event *event)
	378	{
	379	return -ENOSYS;
	380	}
	381
	382	static inline
	383	void lttng_kprobes_unregister(struct ltt_event *event)
	384	{
	385	}
	386
	387	static inline
	388	void lttng_kprobes_destroy_private(struct ltt_event *event)
	389	{
	390	}
	391	#endif
	392
	393	#ifdef CONFIG_KRETPROBES
	394	int lttng_kretprobes_register(const char *name,
	395	const char *symbol_name,
	396	uint64_t offset,
	397	uint64_t addr,
	398	struct ltt_event *event_entry,
	399	struct ltt_event *event_exit);
	400	void lttng_kretprobes_unregister(struct ltt_event *event);
	401	void lttng_kretprobes_destroy_private(struct ltt_event *event);
	402	#else
	403	static inline
	404	int lttng_kretprobes_register(const char *name,
	405	const char *symbol_name,
	406	uint64_t offset,
	407	uint64_t addr,
	408	struct ltt_event *event_entry,
	409	struct ltt_event *event_exit)
	410	{
	411	return -ENOSYS;
	412	}
	413
	414	static inline
	415	void lttng_kretprobes_unregister(struct ltt_event *event)
	416	{
	417	}
	418
	419	static inline
	420	void lttng_kretprobes_destroy_private(struct ltt_event *event)
	421	{
	422	}
	423	#endif
	424
	425	#ifdef CONFIG_DYNAMIC_FTRACE
	426	int lttng_ftrace_register(const char *name,
	427	const char *symbol_name,
	428	struct ltt_event *event);
	429	void lttng_ftrace_unregister(struct ltt_event *event);
	430	void lttng_ftrace_destroy_private(struct ltt_event *event);
	431	#else
	432	static inline
	433	int lttng_ftrace_register(const char *name,
	434	const char *symbol_name,
	435	struct ltt_event *event)
	436	{
	437	return -ENOSYS;
	438	}
	439
	440	static inline
	441	void lttng_ftrace_unregister(struct ltt_event *event)
	442	{
	443	}
	444
	445	static inline
	446	void lttng_ftrace_destroy_private(struct ltt_event *event)
	447	{
	448	}
	449	#endif
	450
	451	int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
	452
	453	extern const struct file_operations lttng_tracepoint_list_fops;
	454
	455	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
	456	#define TRACEPOINT_HAS_DATA_ARG
	457	#endif
	458
	459	#endif /* _LTT_EVENTS_H */