[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);
	/*
	 * 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 *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 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	/*
	216	* packet_avail_size returns the available size in the current
	217	* packet. Note that the size returned is only a hint, since it
	218	* may change due to concurrent writes.
	219	*/
	220	size_t (packet_avail_size)(struct channel chan);
	221	wait_queue_head_t (get_writer_buf_wait_queue)(struct channel *chan, int cpu);
	222	wait_queue_head_t (get_hp_wait_queue)(struct channel *chan);
	223	int (is_finalized)(struct channel chan);
	224	int (is_disabled)(struct channel chan);
	225	};
	226
	227	struct ltt_transport {
	228	char *name;
	229	struct module *owner;
	230	struct list_head node;
	231	struct ltt_channel_ops ops;
	232	};
	233
	234	struct ltt_channel {
	235	unsigned int id;
	236	struct channel chan; / Channel buffers */
	237	int enabled;
	238	struct lttng_ctx *ctx;
	239	/* Event ID management */
	240	struct ltt_session *session;
	241	struct file file; / File associated to channel */
	242	unsigned int free_event_id; /* Next event ID to allocate */
	243	struct list_head list; /* Channel list */
	244	struct ltt_channel_ops *ops;
	245	struct ltt_transport *transport;
	246	struct ltt_event *sc_table; / for syscall tracing */
	247	struct ltt_event sc_unknown; / for unknown syscalls */
	248	struct ltt_event *sc_compat_unknown;
	249	struct ltt_event sc_exit; / for syscall exit */
	250	int header_type; /* 0: unset, 1: compact, 2: large */
	251	int metadata_dumped:1;
	252	};
	253
	254	struct ltt_session {
	255	int active; /* Is trace session active ? */
	256	int been_active; /* Has trace session been active ? */
	257	struct file file; / File associated to session */
	258	struct ltt_channel metadata; / Metadata channel */
	259	struct list_head chan; /* Channel list head */
	260	struct list_head events; /* Event list head */
	261	struct list_head list; /* Session list */
	262	unsigned int free_chan_id; /* Next chan ID to allocate */
	263	uuid_le uuid; /* Trace session unique ID */
	264	int metadata_dumped:1;
	265	};
	266
	267	struct ltt_session *ltt_session_create(void);
	268	int ltt_session_enable(struct ltt_session *session);
	269	int ltt_session_disable(struct ltt_session *session);
	270	void ltt_session_destroy(struct ltt_session *session);
	271
	272	struct ltt_channel ltt_channel_create(struct ltt_session session,
	273	const char *transport_name,
	274	void *buf_addr,
	275	size_t subbuf_size, size_t num_subbuf,
	276	unsigned int switch_timer_interval,
	277	unsigned int read_timer_interval);
	278	struct ltt_channel ltt_global_channel_create(struct ltt_session session,
	279	int overwrite, void *buf_addr,
	280	size_t subbuf_size, size_t num_subbuf,
	281	unsigned int switch_timer_interval,
	282	unsigned int read_timer_interval);
	283
	284	struct ltt_event ltt_event_create(struct ltt_channel chan,
	285	struct lttng_kernel_event *event_param,
	286	void *filter,
	287	const struct lttng_event_desc *internal_desc);
	288
	289	int ltt_channel_enable(struct ltt_channel *channel);
	290	int ltt_channel_disable(struct ltt_channel *channel);
	291	int ltt_event_enable(struct ltt_event *event);
	292	int ltt_event_disable(struct ltt_event *event);
	293
	294	void ltt_transport_register(struct ltt_transport *transport);
	295	void ltt_transport_unregister(struct ltt_transport *transport);
	296
	297	void synchronize_trace(void);
	298	int ltt_debugfs_abi_init(void);
	299	void ltt_debugfs_abi_exit(void);
	300
	301	int ltt_probe_register(struct lttng_probe_desc *desc);
	302	void ltt_probe_unregister(struct lttng_probe_desc *desc);
	303	const struct lttng_event_desc ltt_event_get(const char name);
	304	void ltt_event_put(const struct lttng_event_desc *desc);
	305	int ltt_probes_init(void);
	306	void ltt_probes_exit(void);
	307
	308	#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
	309	int lttng_syscalls_register(struct ltt_channel chan, void filter);
	310	int lttng_syscalls_unregister(struct ltt_channel *chan);
	311	#else
	312	static inline int lttng_syscalls_register(struct ltt_channel chan, void filter)
	313	{
	314	return -ENOSYS;
	315	}
	316
	317	static inline int lttng_syscalls_unregister(struct ltt_channel *chan)
	318	{
	319	return 0;
	320	}
	321	#endif
	322
	323	struct lttng_ctx_field lttng_append_context(struct lttng_ctx *ctx);
	324	int lttng_find_context(struct lttng_ctx ctx, const char name);
	325	void lttng_remove_context_field(struct lttng_ctx **ctx,
	326	struct lttng_ctx_field *field);
	327	void lttng_destroy_context(struct lttng_ctx *ctx);
	328	int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
	329	int lttng_add_comm_to_ctx(struct lttng_ctx **ctx);
	330	int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
	331	int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
	332	int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
	333	int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
	334	int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
	335	int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
	336	int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
	337	#if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
	338	int lttng_add_perf_counter_to_ctx(uint32_t type,
	339	uint64_t config,
	340	const char *name,
	341	struct lttng_ctx **ctx);
	342	#else
	343	static inline
	344	int lttng_add_perf_counter_to_ctx(uint32_t type,
	345	uint64_t config,
	346	const char *name,
	347	struct lttng_ctx **ctx)
	348	{
	349	return -ENOSYS;
	350	}
	351	#endif
	352
	353	#ifdef CONFIG_KPROBES
	354	int lttng_kprobes_register(const char *name,
	355	const char *symbol_name,
	356	uint64_t offset,
	357	uint64_t addr,
	358	struct ltt_event *event);
	359	void lttng_kprobes_unregister(struct ltt_event *event);
	360	void lttng_kprobes_destroy_private(struct ltt_event *event);
	361	#else
	362	static inline
	363	int lttng_kprobes_register(const char *name,
	364	const char *symbol_name,
	365	uint64_t offset,
	366	uint64_t addr,
	367	struct ltt_event *event)
	368	{
	369	return -ENOSYS;
	370	}
	371
	372	static inline
	373	void lttng_kprobes_unregister(struct ltt_event *event)
	374	{
	375	}
	376
	377	static inline
	378	void lttng_kprobes_destroy_private(struct ltt_event *event)
	379	{
	380	}
	381	#endif
	382
	383	#ifdef CONFIG_KRETPROBES
	384	int lttng_kretprobes_register(const char *name,
	385	const char *symbol_name,
	386	uint64_t offset,
	387	uint64_t addr,
	388	struct ltt_event *event_entry,
	389	struct ltt_event *event_exit);
	390	void lttng_kretprobes_unregister(struct ltt_event *event);
	391	void lttng_kretprobes_destroy_private(struct ltt_event *event);
	392	#else
	393	static inline
	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	{
	401	return -ENOSYS;
	402	}
	403
	404	static inline
	405	void lttng_kretprobes_unregister(struct ltt_event *event)
	406	{
	407	}
	408
	409	static inline
	410	void lttng_kretprobes_destroy_private(struct ltt_event *event)
	411	{
	412	}
	413	#endif
	414
	415	#ifdef CONFIG_DYNAMIC_FTRACE
	416	int lttng_ftrace_register(const char *name,
	417	const char *symbol_name,
	418	struct ltt_event *event);
	419	void lttng_ftrace_unregister(struct ltt_event *event);
	420	void lttng_ftrace_destroy_private(struct ltt_event *event);
	421	#else
	422	static inline
	423	int lttng_ftrace_register(const char *name,
	424	const char *symbol_name,
	425	struct ltt_event *event)
	426	{
	427	return -ENOSYS;
	428	}
	429
	430	static inline
	431	void lttng_ftrace_unregister(struct ltt_event *event)
	432	{
	433	}
	434
	435	static inline
	436	void lttng_ftrace_destroy_private(struct ltt_event *event)
	437	{
	438	}
	439	#endif
	440
	441	int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
	442
	443	extern const struct file_operations lttng_tracepoint_list_fops;
	444
	445	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
	446	#define TRACEPOINT_HAS_DATA_ARG
	447	#endif
	448
	449	#endif /* _LTT_EVENTS_H */