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

#ifndef _LTTNG_EVENTS_H
#define _LTTNG_EVENTS_H

/*
 * lttng-events.h
 *
 * Holds LTTng per-session event registry.
 *
 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; only
 * version 2.1 of the License.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

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

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

struct lttng_channel;
struct lttng_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 = lttng_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,
		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 lttng_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 */

/*
 * lttng_event structure is referred to by the tracing fast path. It must be
 * kept small.
 */
struct lttng_event {
	unsigned int id;
	struct lttng_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 */
	unsigned int metadata_dumped:1;
};

struct lttng_channel_ops {
	struct channel *(*channel_create)(const char *name,
				struct lttng_channel *lttng_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 lttng_transport {
	char *name;
	struct module *owner;
	struct list_head node;
	struct lttng_channel_ops ops;
};

struct lttng_channel {
	unsigned int id;
	struct channel *chan;		/* Channel buffers */
	int enabled;
	struct lttng_ctx *ctx;
	/* Event ID management */
	struct lttng_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 lttng_channel_ops *ops;
	struct lttng_transport *transport;
	struct lttng_event **sc_table;	/* for syscall tracing */
	struct lttng_event **compat_sc_table;
	struct lttng_event *sc_unknown;	/* for unknown syscalls */
	struct lttng_event *sc_compat_unknown;
	struct lttng_event *sc_exit;	/* for syscall exit */
	int header_type;		/* 0: unset, 1: compact, 2: large */
	unsigned int metadata_dumped:1;
};

struct lttng_session {
	int active;			/* Is trace session active ? */
	int been_active;		/* Has trace session been active ? */
	struct file *file;		/* File associated to session */
	struct lttng_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 */
	unsigned int metadata_dumped:1;
};

struct lttng_session *lttng_session_create(void);
int lttng_session_enable(struct lttng_session *session);
int lttng_session_disable(struct lttng_session *session);
void lttng_session_destroy(struct lttng_session *session);

struct lttng_channel *lttng_channel_create(struct lttng_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 lttng_channel *lttng_global_channel_create(struct lttng_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 lttng_event *lttng_event_create(struct lttng_channel *chan,
				   struct lttng_kernel_event *event_param,
				   void *filter,
				   const struct lttng_event_desc *internal_desc);

int lttng_channel_enable(struct lttng_channel *channel);
int lttng_channel_disable(struct lttng_channel *channel);
int lttng_event_enable(struct lttng_event *event);
int lttng_event_disable(struct lttng_event *event);

void lttng_transport_register(struct lttng_transport *transport);
void lttng_transport_unregister(struct lttng_transport *transport);

void synchronize_trace(void);
int lttng_abi_init(void);
void lttng_abi_exit(void);

int lttng_probe_register(struct lttng_probe_desc *desc);
void lttng_probe_unregister(struct lttng_probe_desc *desc);
const struct lttng_event_desc *lttng_event_get(const char *name);
void lttng_event_put(const struct lttng_event_desc *desc);
int lttng_probes_init(void);
void lttng_probes_exit(void);

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

static inline int lttng_syscalls_unregister(struct lttng_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_procname_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

extern int lttng_statedump_start(struct lttng_session *session);

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

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

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

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

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

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

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

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

static inline
void lttng_ftrace_destroy_private(struct lttng_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 /* _LTTNG_EVENTS_H */
Commit	Line	Data
	1	#ifndef _LTTNG_EVENTS_H
	2	#define _LTTNG_EVENTS_H
	3
	4	/*
	5	* lttng-events.h
	6	*
	7	* Holds LTTng per-session event registry.
	8	*
	9	* Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	10	*
	11	* This library is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU Lesser General Public
	13	* License as published by the Free Software Foundation; only
	14	* version 2.1 of the License.
	15	*
	16	* This library is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	19	* Lesser General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU Lesser General Public
	22	* License along with this library; if not, write to the Free Software
	23	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	24	*/
	25
	26	#include <linux/list.h>
	27	#include <linux/kprobes.h>
	28	#include "wrapper/uuid.h"
	29	#include "lttng-abi.h"
	30
	31	#undef is_signed_type
	32	#define is_signed_type(type) (((type)(-1)) < 0)
	33
	34	struct lttng_channel;
	35	struct lttng_session;
	36	struct lib_ring_buffer_ctx;
	37	struct perf_event;
	38	struct perf_event_attr;
	39
	40	/* Type description */
	41
	42	/* Update the astract_types name table in lttng-types.c along with this enum */
	43	enum abstract_types {
	44	atype_integer,
	45	atype_enum,
	46	atype_array,
	47	atype_sequence,
	48	atype_string,
	49	NR_ABSTRACT_TYPES,
	50	};
	51
	52	/* Update the string_encodings name table in lttng-types.c along with this enum */
	53	enum lttng_string_encodings {
	54	lttng_encode_none = 0,
	55	lttng_encode_UTF8 = 1,
	56	lttng_encode_ASCII = 2,
	57	NR_STRING_ENCODINGS,
	58	};
	59
	60	struct lttng_enum_entry {
	61	unsigned long long start, end; /* start and end are inclusive */
	62	const char *string;
	63	};
	64
	65	#define __type_integer(_type, _byte_order, _base, _encoding) \
	66	{ \
	67	.atype = atype_integer, \
	68	.u.basic.integer = \
	69	{ \
	70	.size = sizeof(_type) * CHAR_BIT, \
	71	.alignment = lttng_alignof(_type) * CHAR_BIT, \
	72	.signedness = is_signed_type(_type), \
	73	.reverse_byte_order = _byte_order != __BYTE_ORDER, \
	74	.base = _base, \
	75	.encoding = lttng_encode_##_encoding, \
	76	}, \
	77	} \
	78
	79	struct lttng_integer_type {
	80	unsigned int size; /* in bits */
	81	unsigned short alignment; /* in bits */
	82	unsigned int signedness:1,
	83	reverse_byte_order:1;
	84	unsigned int base; /* 2, 8, 10, 16, for pretty print */
	85	enum lttng_string_encodings encoding;
	86	};
	87
	88	union _lttng_basic_type {
	89	struct lttng_integer_type integer;
	90	struct {
	91	const char *name;
	92	} enumeration;
	93	struct {
	94	enum lttng_string_encodings encoding;
	95	} string;
	96	};
	97
	98	struct lttng_basic_type {
	99	enum abstract_types atype;
	100	union {
	101	union _lttng_basic_type basic;
	102	} u;
	103	};
	104
	105	struct lttng_type {
	106	enum abstract_types atype;
	107	union {
	108	union _lttng_basic_type basic;
	109	struct {
	110	struct lttng_basic_type elem_type;
	111	unsigned int length; /* num. elems. */
	112	} array;
	113	struct {
	114	struct lttng_basic_type length_type;
	115	struct lttng_basic_type elem_type;
	116	} sequence;
	117	} u;
	118	};
	119
	120	struct lttng_enum {
	121	const char *name;
	122	struct lttng_type container_type;
	123	const struct lttng_enum_entry *entries;
	124	unsigned int len;
	125	};
	126
	127	/* Event field description */
	128
	129	struct lttng_event_field {
	130	const char *name;
	131	struct lttng_type type;
	132	};
	133
	134	/*
	135	* We need to keep this perf counter field separately from struct
	136	* lttng_ctx_field because cpu hotplug needs fixed-location addresses.
	137	*/
	138	struct lttng_perf_counter_field {
	139	struct notifier_block nb;
	140	int hp_enable;
	141	struct perf_event_attr *attr;
	142	struct perf_event *e; / per-cpu array */
	143	};
	144
	145	struct lttng_ctx_field {
	146	struct lttng_event_field event_field;
	147	size_t (*get_size)(size_t offset);
	148	void (record)(struct lttng_ctx_field field,
	149	struct lib_ring_buffer_ctx *ctx,
	150	struct lttng_channel *chan);
	151	union {
	152	struct lttng_perf_counter_field *perf_counter;
	153	} u;
	154	void (destroy)(struct lttng_ctx_field field);
	155	};
	156
	157	struct lttng_ctx {
	158	struct lttng_ctx_field *fields;
	159	unsigned int nr_fields;
	160	unsigned int allocated_fields;
	161	};
	162
	163	struct lttng_event_desc {
	164	const char *name;
	165	void *probe_callback;
	166	const struct lttng_event_ctx ctx; / context */
	167	const struct lttng_event_field fields; / event payload */
	168	unsigned int nr_fields;
	169	struct module *owner;
	170	};
	171
	172	struct lttng_probe_desc {
	173	const struct lttng_event_desc **event_desc;
	174	unsigned int nr_events;
	175	struct list_head head; /* chain registered probes */
	176	};
	177
	178	struct lttng_krp; /* Kretprobe handling */
	179
	180	/*
	181	* lttng_event structure is referred to by the tracing fast path. It must be
	182	* kept small.
	183	*/
	184	struct lttng_event {
	185	unsigned int id;
	186	struct lttng_channel *chan;
	187	int enabled;
	188	const struct lttng_event_desc *desc;
	189	void *filter;
	190	struct lttng_ctx *ctx;
	191	enum lttng_kernel_instrumentation instrumentation;
	192	union {
	193	struct {
	194	struct kprobe kp;
	195	char *symbol_name;
	196	} kprobe;
	197	struct {
	198	struct lttng_krp *lttng_krp;
	199	char *symbol_name;
	200	} kretprobe;
	201	struct {
	202	char *symbol_name;
	203	} ftrace;
	204	} u;
	205	struct list_head list; /* Event list */
	206	unsigned int metadata_dumped:1;
	207	};
	208
	209	struct lttng_channel_ops {
	210	struct channel (channel_create)(const char *name,
	211	struct lttng_channel *lttng_chan,
	212	void *buf_addr,
	213	size_t subbuf_size, size_t num_subbuf,
	214	unsigned int switch_timer_interval,
	215	unsigned int read_timer_interval);
	216	void (channel_destroy)(struct channel chan);
	217	struct lib_ring_buffer (buffer_read_open)(struct channel *chan);
	218	int (buffer_has_read_closed_stream)(struct channel chan);
	219	void (buffer_read_close)(struct lib_ring_buffer buf);
	220	int (event_reserve)(struct lib_ring_buffer_ctx ctx,
	221	uint32_t event_id);
	222	void (event_commit)(struct lib_ring_buffer_ctx ctx);
	223	void (event_write)(struct lib_ring_buffer_ctx ctx, const void *src,
	224	size_t len);
	225	void (event_write_from_user)(struct lib_ring_buffer_ctx ctx,
	226	const void *src, size_t len);
	227	void (event_memset)(struct lib_ring_buffer_ctx ctx,
	228	int c, size_t len);
	229	/*
	230	* packet_avail_size returns the available size in the current
	231	* packet. Note that the size returned is only a hint, since it
	232	* may change due to concurrent writes.
	233	*/
	234	size_t (packet_avail_size)(struct channel chan);
	235	wait_queue_head_t (get_writer_buf_wait_queue)(struct channel *chan, int cpu);
	236	wait_queue_head_t (get_hp_wait_queue)(struct channel *chan);
	237	int (is_finalized)(struct channel chan);
	238	int (is_disabled)(struct channel chan);
	239	};
	240
	241	struct lttng_transport {
	242	char *name;
	243	struct module *owner;
	244	struct list_head node;
	245	struct lttng_channel_ops ops;
	246	};
	247
	248	struct lttng_channel {
	249	unsigned int id;
	250	struct channel chan; / Channel buffers */
	251	int enabled;
	252	struct lttng_ctx *ctx;
	253	/* Event ID management */
	254	struct lttng_session *session;
	255	struct file file; / File associated to channel */
	256	unsigned int free_event_id; /* Next event ID to allocate */
	257	struct list_head list; /* Channel list */
	258	struct lttng_channel_ops *ops;
	259	struct lttng_transport *transport;
	260	struct lttng_event *sc_table; / for syscall tracing */
	261	struct lttng_event **compat_sc_table;
	262	struct lttng_event sc_unknown; / for unknown syscalls */
	263	struct lttng_event *sc_compat_unknown;
	264	struct lttng_event sc_exit; / for syscall exit */
	265	int header_type; /* 0: unset, 1: compact, 2: large */
	266	unsigned int metadata_dumped:1;
	267	};
	268
	269	struct lttng_session {
	270	int active; /* Is trace session active ? */
	271	int been_active; /* Has trace session been active ? */
	272	struct file file; / File associated to session */
	273	struct lttng_channel metadata; / Metadata channel */
	274	struct list_head chan; /* Channel list head */
	275	struct list_head events; /* Event list head */
	276	struct list_head list; /* Session list */
	277	unsigned int free_chan_id; /* Next chan ID to allocate */
	278	uuid_le uuid; /* Trace session unique ID */
	279	unsigned int metadata_dumped:1;
	280	};
	281
	282	struct lttng_session *lttng_session_create(void);
	283	int lttng_session_enable(struct lttng_session *session);
	284	int lttng_session_disable(struct lttng_session *session);
	285	void lttng_session_destroy(struct lttng_session *session);
	286
	287	struct lttng_channel lttng_channel_create(struct lttng_session session,
	288	const char *transport_name,
	289	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	struct lttng_channel lttng_global_channel_create(struct lttng_session session,
	294	int overwrite, void *buf_addr,
	295	size_t subbuf_size, size_t num_subbuf,
	296	unsigned int switch_timer_interval,
	297	unsigned int read_timer_interval);
	298
	299	struct lttng_event lttng_event_create(struct lttng_channel chan,
	300	struct lttng_kernel_event *event_param,
	301	void *filter,
	302	const struct lttng_event_desc *internal_desc);
	303
	304	int lttng_channel_enable(struct lttng_channel *channel);
	305	int lttng_channel_disable(struct lttng_channel *channel);
	306	int lttng_event_enable(struct lttng_event *event);
	307	int lttng_event_disable(struct lttng_event *event);
	308
	309	void lttng_transport_register(struct lttng_transport *transport);
	310	void lttng_transport_unregister(struct lttng_transport *transport);
	311
	312	void synchronize_trace(void);
	313	int lttng_abi_init(void);
	314	void lttng_abi_exit(void);
	315
	316	int lttng_probe_register(struct lttng_probe_desc *desc);
	317	void lttng_probe_unregister(struct lttng_probe_desc *desc);
	318	const struct lttng_event_desc lttng_event_get(const char name);
	319	void lttng_event_put(const struct lttng_event_desc *desc);
	320	int lttng_probes_init(void);
	321	void lttng_probes_exit(void);
	322
	323	#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
	324	int lttng_syscalls_register(struct lttng_channel chan, void filter);
	325	int lttng_syscalls_unregister(struct lttng_channel *chan);
	326	#else
	327	static inline int lttng_syscalls_register(struct lttng_channel chan, void filter)
	328	{
	329	return -ENOSYS;
	330	}
	331
	332	static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
	333	{
	334	return 0;
	335	}
	336	#endif
	337
	338	struct lttng_ctx_field lttng_append_context(struct lttng_ctx *ctx);
	339	int lttng_find_context(struct lttng_ctx ctx, const char name);
	340	void lttng_remove_context_field(struct lttng_ctx **ctx,
	341	struct lttng_ctx_field *field);
	342	void lttng_destroy_context(struct lttng_ctx *ctx);
	343	int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
	344	int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
	345	int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
	346	int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
	347	int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
	348	int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
	349	int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
	350	int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
	351	int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
	352	#if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
	353	int lttng_add_perf_counter_to_ctx(uint32_t type,
	354	uint64_t config,
	355	const char *name,
	356	struct lttng_ctx **ctx);
	357	#else
	358	static inline
	359	int lttng_add_perf_counter_to_ctx(uint32_t type,
	360	uint64_t config,
	361	const char *name,
	362	struct lttng_ctx **ctx)
	363	{
	364	return -ENOSYS;
	365	}
	366	#endif
	367
	368	extern int lttng_statedump_start(struct lttng_session *session);
	369
	370	#ifdef CONFIG_KPROBES
	371	int lttng_kprobes_register(const char *name,
	372	const char *symbol_name,
	373	uint64_t offset,
	374	uint64_t addr,
	375	struct lttng_event *event);
	376	void lttng_kprobes_unregister(struct lttng_event *event);
	377	void lttng_kprobes_destroy_private(struct lttng_event *event);
	378	#else
	379	static inline
	380	int lttng_kprobes_register(const char *name,
	381	const char *symbol_name,
	382	uint64_t offset,
	383	uint64_t addr,
	384	struct lttng_event *event)
	385	{
	386	return -ENOSYS;
	387	}
	388
	389	static inline
	390	void lttng_kprobes_unregister(struct lttng_event *event)
	391	{
	392	}
	393
	394	static inline
	395	void lttng_kprobes_destroy_private(struct lttng_event *event)
	396	{
	397	}
	398	#endif
	399
	400	#ifdef CONFIG_KRETPROBES
	401	int lttng_kretprobes_register(const char *name,
	402	const char *symbol_name,
	403	uint64_t offset,
	404	uint64_t addr,
	405	struct lttng_event *event_entry,
	406	struct lttng_event *event_exit);
	407	void lttng_kretprobes_unregister(struct lttng_event *event);
	408	void lttng_kretprobes_destroy_private(struct lttng_event *event);
	409	#else
	410	static inline
	411	int lttng_kretprobes_register(const char *name,
	412	const char *symbol_name,
	413	uint64_t offset,
	414	uint64_t addr,
	415	struct lttng_event *event_entry,
	416	struct lttng_event *event_exit)
	417	{
	418	return -ENOSYS;
	419	}
	420
	421	static inline
	422	void lttng_kretprobes_unregister(struct lttng_event *event)
	423	{
	424	}
	425
	426	static inline
	427	void lttng_kretprobes_destroy_private(struct lttng_event *event)
	428	{
	429	}
	430	#endif
	431
	432	#ifdef CONFIG_DYNAMIC_FTRACE
	433	int lttng_ftrace_register(const char *name,
	434	const char *symbol_name,
	435	struct lttng_event *event);
	436	void lttng_ftrace_unregister(struct lttng_event *event);
	437	void lttng_ftrace_destroy_private(struct lttng_event *event);
	438	#else
	439	static inline
	440	int lttng_ftrace_register(const char *name,
	441	const char *symbol_name,
	442	struct lttng_event *event)
	443	{
	444	return -ENOSYS;
	445	}
	446
	447	static inline
	448	void lttng_ftrace_unregister(struct lttng_event *event)
	449	{
	450	}
	451
	452	static inline
	453	void lttng_ftrace_destroy_private(struct lttng_event *event)
	454	{
	455	}
	456	#endif
	457
	458	int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
	459
	460	extern const struct file_operations lttng_tracepoint_list_fops;
	461
	462	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
	463	#define TRACEPOINT_HAS_DATA_ARG
	464	#endif
	465
	466	#endif /* _LTTNG_EVENTS_H */