[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 *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
11b5a3c2 MD	1	#ifndef _LTT_EVENTS_H
	2	#define _LTT_EVENTS_H
	3
4e3c1b9b MD	4	/*
	5	* ltt-events.h
	6	*
	7	* Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	8	*
	9	* Holds LTTng per-session event registry.
17baffe2 MD	10	*
17baffe2 MD	11	* Dual LGPL v2.1/GPL v2 license.
4e3c1b9b MD	12	*/
	13
	14	#include <linux/list.h>
d6d808f3	15	#include <linux/kprobes.h>
a864fb02	16	#include "wrapper/uuid.h"
11b5a3c2	17	#include "ltt-debugfs-abi.h"
4e3c1b9b	18
9e7e4892 MD	19	#undef is_signed_type
	20	#define is_signed_type(type) (((type)(-1)) < 0)
	21
4e3c1b9b MD	22	struct ltt_channel;
4e3c1b9b MD	23	struct ltt_session;
1c25284c	24	struct lib_ring_buffer_ctx;
ba1f5986	25	struct perf_event;
833ad6a0	26	struct perf_event_attr;
4e3c1b9b	27
c0edae1d MD	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 {
e0a7a7c4 MD	42	lttng_encode_none = 0,
	43	lttng_encode_UTF8 = 1,
	44	lttng_encode_ASCII = 2,
c0edae1d MD	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
64c796d8	53	#define __type_integer(_type, _byte_order, _base, _encoding) \
c099397a MD	54	{ \
	55	.atype = atype_integer, \
	56	.u.basic.integer = \
	57	{ \
30bdb6e4	58	.size = sizeof(_type) * CHAR_BIT, \
d793d5e1	59	.alignment = ltt_alignof(_type) * CHAR_BIT, \
c099397a MD	60	.signedness = is_signed_type(_type), \
c099397a MD	61	.reverse_byte_order = _byte_order != __BYTE_ORDER, \
e0a7a7c4	62	.base = _base, \
64c796d8	63	.encoding = lttng_encode_##_encoding, \
c099397a MD	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;
e0a7a7c4 MD	72	unsigned int base; /* 2, 8, 10, 16, for pretty print */
e0a7a7c4 MD	73	enum lttng_string_encodings encoding;
c099397a MD	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;
c0edae1d MD	91	};
	92
	93	struct lttng_type {
	94	enum abstract_types atype;
c0edae1d	95	union {
c099397a	96	union _lttng_basic_type basic;
c0edae1d	97	struct {
c099397a	98	struct lttng_basic_type elem_type;
c0edae1d MD	99	unsigned int length; /* num. elems. */
	100	} array;
	101	struct {
c099397a MD	102	struct lttng_basic_type length_type;
c099397a MD	103	struct lttng_basic_type elem_type;
c0edae1d	104	} sequence;
c0edae1d	105	} u;
c099397a MD	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	};
c0edae1d MD	114
	115	/* Event field description */
	116
	117	struct lttng_event_field {
	118	const char *name;
f17701fb	119	struct lttng_type type;
c0edae1d MD	120	};
c0edae1d MD	121
2001023e MD	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
ba1f5986	133	struct lttng_ctx_field {
8070f5c0	134	struct lttng_event_field event_field;
f1676205 MD	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);
ba1f5986	139	union {
2001023e	140	struct lttng_perf_counter_field *perf_counter;
ba1f5986	141	} u;
2dccf128	142	void (destroy)(struct lttng_ctx_field field);
ba1f5986 MD	143	};
	144
	145	struct lttng_ctx {
833ad6a0	146	struct lttng_ctx_field *fields;
0d1a681e	147	unsigned int nr_fields;
ba1f5986	148	unsigned int allocated_fields;
0d1a681e MD	149	};
	150
	151	struct lttng_event_desc {
c0edae1d MD	152	const char *name;
c0edae1d MD	153	void *probe_callback;
0d1a681e MD	154	const struct lttng_event_ctx ctx; / context */
0d1a681e MD	155	const struct lttng_event_field fields; / event payload */
c0edae1d	156	unsigned int nr_fields;
dc7f600a	157	struct module *owner;
c0edae1d MD	158	};
c0edae1d MD	159
85a9ca7f	160	struct lttng_probe_desc {
f7bdf4db	161	const struct lttng_event_desc **event_desc;
85a9ca7f MD	162	unsigned int nr_events;
	163	struct list_head head; /* chain registered probes */
	164	};
	165
7371f44c MD	166	struct lttng_krp; /* Kretprobe handling */
7371f44c MD	167
85a9ca7f MD	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;
e64957da	175	int enabled;
d3dbe23c	176	const struct lttng_event_desc *desc;
85a9ca7f	177	void *filter;
f1676205	178	struct lttng_ctx *ctx;
38d024ae	179	enum lttng_kernel_instrumentation instrumentation;
d6d808f3 MD	180	union {
	181	struct {
	182	struct kprobe kp;
	183	char *symbol_name;
	184	} kprobe;
7371f44c MD	185	struct {
	186	struct lttng_krp *lttng_krp;
	187	char *symbol_name;
	188	} kretprobe;
e0a7a7c4 MD	189	struct {
	190	char *symbol_name;
	191	} ftrace;
d6d808f3	192	} u;
85a9ca7f	193	struct list_head list; /* Event list */
c099397a	194	int metadata_dumped:1;
85a9ca7f MD	195	};
	196
	197	struct ltt_channel_ops {
	198	struct channel (channel_create)(const char *name,
9115fbdc	199	struct ltt_channel *ltt_chan,
85a9ca7f MD	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);
f71ecafa	206	int (buffer_has_read_closed_stream)(struct channel chan);
85a9ca7f	207	void (buffer_read_close)(struct lib_ring_buffer buf);
4e1f08f4	208	int (event_reserve)(struct lib_ring_buffer_ctx ctx,
64c796d8	209	uint32_t event_id);
85a9ca7f MD	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);
4ea00e4f JD	213	void (event_write_from_user)(struct lib_ring_buffer_ctx ctx,
4ea00e4f JD	214	const void *src, size_t len);
58aa5d24 MD	215	void (event_memset)(struct lib_ring_buffer_ctx ctx,
58aa5d24 MD	216	int c, size_t len);
1ec3f75a MD	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);
71c1d843	223	wait_queue_head_t (get_writer_buf_wait_queue)(struct channel *chan, int cpu);
24cedcfe MD	224	wait_queue_head_t (get_hp_wait_queue)(struct channel *chan);
24cedcfe MD	225	int (is_finalized)(struct channel chan);
254ec7bc	226	int (is_disabled)(struct channel chan);
85a9ca7f MD	227	};
85a9ca7f MD	228
a33c9927 MD	229	struct ltt_transport {
	230	char *name;
	231	struct module *owner;
	232	struct list_head node;
	233	struct ltt_channel_ops ops;
	234	};
	235
85a9ca7f	236	struct ltt_channel {
c099397a	237	unsigned int id;
85a9ca7f	238	struct channel chan; / Channel buffers */
e64957da	239	int enabled;
f1676205	240	struct lttng_ctx *ctx;
85a9ca7f MD	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 */
85a9ca7f	246	struct ltt_channel_ops *ops;
a33c9927	247	struct ltt_transport *transport;
1ec65de1	248	struct ltt_event *sc_table; / for syscall tracing */
f405cfce	249	struct ltt_event sc_unknown; / for unknown syscalls */
b76dc1a0	250	struct ltt_event *sc_compat_unknown;
2f804c0a	251	struct ltt_event sc_exit; / for syscall exit */
9115fbdc	252	int header_type; /* 0: unset, 1: compact, 2: large */
c099397a	253	int metadata_dumped:1;
85a9ca7f MD	254	};
	255
	256	struct ltt_session {
	257	int active; /* Is trace session active ? */
8070f5c0	258	int been_active; /* Has trace session been active ? */
85a9ca7f	259	struct file file; / File associated to session */
c099397a	260	struct ltt_channel metadata; / Metadata channel */
85a9ca7f MD	261	struct list_head chan; /* Channel list head */
	262	struct list_head events; /* Event list head */
	263	struct list_head list; /* Session list */
c099397a	264	unsigned int free_chan_id; /* Next chan ID to allocate */
d793d5e1	265	uuid_le uuid; /* Trace session unique ID */
c099397a	266	int metadata_dumped:1;
85a9ca7f MD	267	};
85a9ca7f MD	268
baf20995	269	struct ltt_session *ltt_session_create(void);
e64957da MD	270	int ltt_session_enable(struct ltt_session *session);
e64957da MD	271	int ltt_session_disable(struct ltt_session *session);
11b5a3c2	272	void ltt_session_destroy(struct ltt_session *session);
4e3c1b9b	273
baf20995	274	struct ltt_channel ltt_channel_create(struct ltt_session session,
5dbbdb43 MD	275	const char *transport_name,
	276	void *buf_addr,
	277	size_t subbuf_size, size_t num_subbuf,
	278	unsigned int switch_timer_interval,
	279	unsigned int read_timer_interval);
	280	struct ltt_channel ltt_global_channel_create(struct ltt_session session,
4e3c1b9b MD	281	int overwrite, void *buf_addr,
	282	size_t subbuf_size, size_t num_subbuf,
	283	unsigned int switch_timer_interval,
	284	unsigned int read_timer_interval);
4e3c1b9b	285
653fe716	286	struct ltt_event ltt_event_create(struct ltt_channel chan,
d6d808f3	287	struct lttng_kernel_event *event_param,
259b6cb3 MD	288	void *filter,
259b6cb3 MD	289	const struct lttng_event_desc *internal_desc);
c0e31d2e	290
e64957da MD	291	int ltt_channel_enable(struct ltt_channel *channel);
	292	int ltt_channel_disable(struct ltt_channel *channel);
	293	int ltt_event_enable(struct ltt_event *event);
	294	int ltt_event_disable(struct ltt_event *event);
	295
c0e31d2e MD	296	void ltt_transport_register(struct ltt_transport *transport);
c0e31d2e MD	297	void ltt_transport_unregister(struct ltt_transport *transport);
11b5a3c2	298
360f38ea	299	void synchronize_trace(void);
1c25284c MD	300	int ltt_debugfs_abi_init(void);
	301	void ltt_debugfs_abi_exit(void);
	302
85a9ca7f MD	303	int ltt_probe_register(struct lttng_probe_desc *desc);
	304	void ltt_probe_unregister(struct lttng_probe_desc *desc);
	305	const struct lttng_event_desc ltt_event_get(const char name);
	306	void ltt_event_put(const struct lttng_event_desc *desc);
cd4bd11f MD	307	int ltt_probes_init(void);
cd4bd11f MD	308	void ltt_probes_exit(void);
1ec65de1	309
63728b02	310	#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
1ec65de1 MD	311	int lttng_syscalls_register(struct ltt_channel chan, void filter);
	312	int lttng_syscalls_unregister(struct ltt_channel *chan);
	313	#else
	314	static inline int lttng_syscalls_register(struct ltt_channel chan, void filter)
	315	{
	316	return -ENOSYS;
	317	}
	318
	319	static inline int lttng_syscalls_unregister(struct ltt_channel *chan)
	320	{
	321	return 0;
	322	}
	323	#endif
	324
2dccf128	325	struct lttng_ctx_field lttng_append_context(struct lttng_ctx *ctx);
44252f0f	326	int lttng_find_context(struct lttng_ctx ctx, const char name);
8289661d MD	327	void lttng_remove_context_field(struct lttng_ctx **ctx,
8289661d MD	328	struct lttng_ctx_field *field);
2dccf128	329	void lttng_destroy_context(struct lttng_ctx *ctx);
8070f5c0	330	int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
25b2f99a	331	int lttng_add_comm_to_ctx(struct lttng_ctx **ctx);
a8ad3613	332	int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
53f1f0ca	333	int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
b64bc438 MD	334	int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
	335	int lttng_add_tid_to_ctx(struct lttng_ctx **ctx);
	336	int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
	337	int lttng_add_ppid_to_ctx(struct lttng_ctx **ctx);
	338	int lttng_add_vppid_to_ctx(struct lttng_ctx **ctx);
41c3c24e	339	#if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
c24a0d71 MD	340	int lttng_add_perf_counter_to_ctx(uint32_t type,
	341	uint64_t config,
	342	const char *name,
	343	struct lttng_ctx **ctx);
1d443b34 MD	344	#else
	345	static inline
	346	int lttng_add_perf_counter_to_ctx(uint32_t type,
	347	uint64_t config,
	348	const char *name,
	349	struct lttng_ctx **ctx)
	350	{
	351	return -ENOSYS;
	352	}
	353	#endif
02119ee5	354
acd614cc	355	#ifdef CONFIG_KPROBES
f17701fb MD	356	int lttng_kprobes_register(const char *name,
	357	const char *symbol_name,
	358	uint64_t offset,
	359	uint64_t addr,
	360	struct ltt_event *event);
	361	void lttng_kprobes_unregister(struct ltt_event *event);
edeb3137	362	void lttng_kprobes_destroy_private(struct ltt_event *event);
acd614cc MD	363	#else
	364	static inline
	365	int lttng_kprobes_register(const char *name,
	366	const char *symbol_name,
	367	uint64_t offset,
	368	uint64_t addr,
	369	struct ltt_event *event)
	370	{
	371	return -ENOSYS;
	372	}
	373
25f53c39	374	static inline
acd614cc MD	375	void lttng_kprobes_unregister(struct ltt_event *event)
	376	{
	377	}
edeb3137 MD	378
	379	static inline
	380	void lttng_kprobes_destroy_private(struct ltt_event *event)
	381	{
	382	}
acd614cc	383	#endif
d6d808f3	384
7371f44c MD	385	#ifdef CONFIG_KRETPROBES
	386	int lttng_kretprobes_register(const char *name,
	387	const char *symbol_name,
	388	uint64_t offset,
	389	uint64_t addr,
	390	struct ltt_event *event_entry,
	391	struct ltt_event *event_exit);
	392	void lttng_kretprobes_unregister(struct ltt_event *event);
	393	void lttng_kretprobes_destroy_private(struct ltt_event *event);
	394	#else
	395	static inline
	396	int lttng_kretprobes_register(const char *name,
	397	const char *symbol_name,
	398	uint64_t offset,
	399	uint64_t addr,
	400	struct ltt_event *event_entry,
	401	struct ltt_event *event_exit)
	402	{
	403	return -ENOSYS;
	404	}
	405
	406	static inline
	407	void lttng_kretprobes_unregister(struct ltt_event *event)
	408	{
	409	}
	410
	411	static inline
	412	void lttng_kretprobes_destroy_private(struct ltt_event *event)
	413	{
	414	}
	415	#endif
	416
e0a7a7c4 MD	417	#ifdef CONFIG_DYNAMIC_FTRACE
	418	int lttng_ftrace_register(const char *name,
	419	const char *symbol_name,
	420	struct ltt_event *event);
	421	void lttng_ftrace_unregister(struct ltt_event *event);
edeb3137	422	void lttng_ftrace_destroy_private(struct ltt_event *event);
e0a7a7c4 MD	423	#else
	424	static inline
	425	int lttng_ftrace_register(const char *name,
	426	const char *symbol_name,
	427	struct ltt_event *event)
	428	{
acd614cc	429	return -ENOSYS;
e0a7a7c4 MD	430	}
	431
	432	static inline
	433	void lttng_ftrace_unregister(struct ltt_event *event)
	434	{
	435	}
edeb3137 MD	436
	437	static inline
	438	void lttng_ftrace_destroy_private(struct ltt_event *event)
	439	{
	440	}
e0a7a7c4	441	#endif
271b6681	442
3db41b2c	443	int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
57105fc2	444
271b6681 MD	445	extern const struct file_operations lttng_tracepoint_list_fops;
271b6681 MD	446
ef200626 MD	447	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
	448	#define TRACEPOINT_HAS_DATA_ARG
	449	#endif
	450
11b5a3c2	451	#endif /* _LTT_EVENTS_H */