[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
a90917c3 MD	1	#ifndef _LTTNG_EVENTS_H
a90917c3 MD	2	#define _LTTNG_EVENTS_H
11b5a3c2	3
4e3c1b9b	4	/*
a90917c3	5	* lttng-events.h
4e3c1b9b	6	*
4e3c1b9b	7	* Holds LTTng per-session event registry.
17baffe2	8	*
886d51a3 MD	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
4e3c1b9b MD	24	*/
	25
	26	#include <linux/list.h>
d6d808f3	27	#include <linux/kprobes.h>
a864fb02	28	#include "wrapper/uuid.h"
e8951e63	29	#include "lttng-abi.h"
4e3c1b9b	30
9e7e4892 MD	31	#undef is_signed_type
	32	#define is_signed_type(type) (((type)(-1)) < 0)
	33
a90917c3 MD	34	struct lttng_channel;
a90917c3 MD	35	struct lttng_session;
1c25284c	36	struct lib_ring_buffer_ctx;
ba1f5986	37	struct perf_event;
833ad6a0	38	struct perf_event_attr;
4e3c1b9b	39
c0edae1d MD	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 {
e0a7a7c4 MD	54	lttng_encode_none = 0,
	55	lttng_encode_UTF8 = 1,
	56	lttng_encode_ASCII = 2,
c0edae1d MD	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
64c796d8	65	#define __type_integer(_type, _byte_order, _base, _encoding) \
c099397a MD	66	{ \
	67	.atype = atype_integer, \
	68	.u.basic.integer = \
	69	{ \
30bdb6e4	70	.size = sizeof(_type) * CHAR_BIT, \
a90917c3	71	.alignment = lttng_alignof(_type) * CHAR_BIT, \
c099397a MD	72	.signedness = is_signed_type(_type), \
c099397a MD	73	.reverse_byte_order = _byte_order != __BYTE_ORDER, \
e0a7a7c4	74	.base = _base, \
64c796d8	75	.encoding = lttng_encode_##_encoding, \
c099397a MD	76	}, \
	77	} \
	78
	79	struct lttng_integer_type {
	80	unsigned int size; /* in bits */
	81	unsigned short alignment; /* in bits */
9cccf98a MD	82	unsigned int signedness:1,
9cccf98a MD	83	reverse_byte_order:1;
e0a7a7c4 MD	84	unsigned int base; /* 2, 8, 10, 16, for pretty print */
e0a7a7c4 MD	85	enum lttng_string_encodings encoding;
c099397a MD	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;
c0edae1d MD	103	};
	104
	105	struct lttng_type {
	106	enum abstract_types atype;
c0edae1d	107	union {
c099397a	108	union _lttng_basic_type basic;
c0edae1d	109	struct {
c099397a	110	struct lttng_basic_type elem_type;
c0edae1d MD	111	unsigned int length; /* num. elems. */
	112	} array;
	113	struct {
c099397a MD	114	struct lttng_basic_type length_type;
c099397a MD	115	struct lttng_basic_type elem_type;
c0edae1d	116	} sequence;
c0edae1d	117	} u;
c099397a MD	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	};
c0edae1d MD	126
	127	/* Event field description */
	128
	129	struct lttng_event_field {
	130	const char *name;
f17701fb	131	struct lttng_type type;
c0edae1d MD	132	};
c0edae1d MD	133
2001023e MD	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
ba1f5986	145	struct lttng_ctx_field {
8070f5c0	146	struct lttng_event_field event_field;
f1676205 MD	147	size_t (*get_size)(size_t offset);
	148	void (record)(struct lttng_ctx_field field,
	149	struct lib_ring_buffer_ctx *ctx,
a90917c3	150	struct lttng_channel *chan);
ba1f5986	151	union {
2001023e	152	struct lttng_perf_counter_field *perf_counter;
ba1f5986	153	} u;
2dccf128	154	void (destroy)(struct lttng_ctx_field field);
ba1f5986 MD	155	};
	156
	157	struct lttng_ctx {
833ad6a0	158	struct lttng_ctx_field *fields;
0d1a681e	159	unsigned int nr_fields;
ba1f5986	160	unsigned int allocated_fields;
0d1a681e MD	161	};
	162
	163	struct lttng_event_desc {
c0edae1d MD	164	const char *name;
c0edae1d MD	165	void *probe_callback;
0d1a681e MD	166	const struct lttng_event_ctx ctx; / context */
0d1a681e MD	167	const struct lttng_event_field fields; / event payload */
c0edae1d	168	unsigned int nr_fields;
dc7f600a	169	struct module *owner;
c0edae1d MD	170	};
c0edae1d MD	171
85a9ca7f	172	struct lttng_probe_desc {
f7bdf4db	173	const struct lttng_event_desc **event_desc;
85a9ca7f MD	174	unsigned int nr_events;
	175	struct list_head head; /* chain registered probes */
	176	};
	177
7371f44c MD	178	struct lttng_krp; /* Kretprobe handling */
7371f44c MD	179
85a9ca7f	180	/*
a90917c3	181	* lttng_event structure is referred to by the tracing fast path. It must be
85a9ca7f MD	182	* kept small.
85a9ca7f MD	183	*/
a90917c3	184	struct lttng_event {
85a9ca7f	185	unsigned int id;
a90917c3	186	struct lttng_channel *chan;
e64957da	187	int enabled;
d3dbe23c	188	const struct lttng_event_desc *desc;
85a9ca7f	189	void *filter;
f1676205	190	struct lttng_ctx *ctx;
38d024ae	191	enum lttng_kernel_instrumentation instrumentation;
d6d808f3 MD	192	union {
	193	struct {
	194	struct kprobe kp;
	195	char *symbol_name;
	196	} kprobe;
7371f44c MD	197	struct {
	198	struct lttng_krp *lttng_krp;
	199	char *symbol_name;
	200	} kretprobe;
e0a7a7c4 MD	201	struct {
	202	char *symbol_name;
	203	} ftrace;
d6d808f3	204	} u;
85a9ca7f	205	struct list_head list; /* Event list */
9cccf98a	206	unsigned int metadata_dumped:1;
85a9ca7f MD	207	};
85a9ca7f MD	208
a90917c3	209	struct lttng_channel_ops {
85a9ca7f	210	struct channel (channel_create)(const char *name,
a90917c3	211	struct lttng_channel *lttng_chan,
85a9ca7f MD	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);
f71ecafa	218	int (buffer_has_read_closed_stream)(struct channel chan);
85a9ca7f	219	void (buffer_read_close)(struct lib_ring_buffer buf);
4e1f08f4	220	int (event_reserve)(struct lib_ring_buffer_ctx ctx,
64c796d8	221	uint32_t event_id);
85a9ca7f MD	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);
4ea00e4f JD	225	void (event_write_from_user)(struct lib_ring_buffer_ctx ctx,
4ea00e4f JD	226	const void *src, size_t len);
58aa5d24 MD	227	void (event_memset)(struct lib_ring_buffer_ctx ctx,
58aa5d24 MD	228	int c, size_t len);
1ec3f75a MD	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);
71c1d843	235	wait_queue_head_t (get_writer_buf_wait_queue)(struct channel *chan, int cpu);
24cedcfe MD	236	wait_queue_head_t (get_hp_wait_queue)(struct channel *chan);
24cedcfe MD	237	int (is_finalized)(struct channel chan);
254ec7bc	238	int (is_disabled)(struct channel chan);
85a9ca7f MD	239	};
85a9ca7f MD	240
a90917c3	241	struct lttng_transport {
a33c9927 MD	242	char *name;
	243	struct module *owner;
	244	struct list_head node;
a90917c3	245	struct lttng_channel_ops ops;
a33c9927 MD	246	};
a33c9927 MD	247
a90917c3	248	struct lttng_channel {
c099397a	249	unsigned int id;
85a9ca7f	250	struct channel chan; / Channel buffers */
e64957da	251	int enabled;
f1676205	252	struct lttng_ctx *ctx;
85a9ca7f	253	/* Event ID management */
a90917c3	254	struct lttng_session *session;
85a9ca7f MD	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 */
a90917c3 MD	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 */
9115fbdc	265	int header_type; /* 0: unset, 1: compact, 2: large */
9cccf98a	266	unsigned int metadata_dumped:1;
85a9ca7f MD	267	};
85a9ca7f MD	268
a90917c3	269	struct lttng_session {
85a9ca7f	270	int active; /* Is trace session active ? */
8070f5c0	271	int been_active; /* Has trace session been active ? */
85a9ca7f	272	struct file file; / File associated to session */
a90917c3	273	struct lttng_channel metadata; / Metadata channel */
85a9ca7f MD	274	struct list_head chan; /* Channel list head */
	275	struct list_head events; /* Event list head */
	276	struct list_head list; /* Session list */
c099397a	277	unsigned int free_chan_id; /* Next chan ID to allocate */
d793d5e1	278	uuid_le uuid; /* Trace session unique ID */
9cccf98a	279	unsigned int metadata_dumped:1;
85a9ca7f MD	280	};
85a9ca7f MD	281
a90917c3 MD	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);
4e3c1b9b	286
a90917c3	287	struct lttng_channel lttng_channel_create(struct lttng_session session,
5dbbdb43 MD	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);
a90917c3	293	struct lttng_channel lttng_global_channel_create(struct lttng_session session,
4e3c1b9b MD	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);
4e3c1b9b	298
a90917c3	299	struct lttng_event lttng_event_create(struct lttng_channel chan,
d6d808f3	300	struct lttng_kernel_event *event_param,
259b6cb3 MD	301	void *filter,
259b6cb3 MD	302	const struct lttng_event_desc *internal_desc);
c0e31d2e	303
a90917c3 MD	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);
e64957da	308
a90917c3 MD	309	void lttng_transport_register(struct lttng_transport *transport);
a90917c3 MD	310	void lttng_transport_unregister(struct lttng_transport *transport);
11b5a3c2	311
360f38ea	312	void synchronize_trace(void);
80996790 MD	313	int lttng_abi_init(void);
80996790 MD	314	void lttng_abi_exit(void);
1c25284c	315
a90917c3 MD	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);
1ec65de1	322
63728b02	323	#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
a90917c3 MD	324	int lttng_syscalls_register(struct lttng_channel chan, void filter);
a90917c3 MD	325	int lttng_syscalls_unregister(struct lttng_channel *chan);
1ec65de1	326	#else
a90917c3	327	static inline int lttng_syscalls_register(struct lttng_channel chan, void filter)
1ec65de1 MD	328	{
	329	return -ENOSYS;
	330	}
	331
a90917c3	332	static inline int lttng_syscalls_unregister(struct lttng_channel *chan)
1ec65de1 MD	333	{
	334	return 0;
	335	}
	336	#endif
	337
2dccf128	338	struct lttng_ctx_field lttng_append_context(struct lttng_ctx *ctx);
44252f0f	339	int lttng_find_context(struct lttng_ctx ctx, const char name);
8289661d MD	340	void lttng_remove_context_field(struct lttng_ctx **ctx,
8289661d MD	341	struct lttng_ctx_field *field);
2dccf128	342	void lttng_destroy_context(struct lttng_ctx *ctx);
8070f5c0	343	int lttng_add_pid_to_ctx(struct lttng_ctx **ctx);
a2563e83	344	int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
a8ad3613	345	int lttng_add_prio_to_ctx(struct lttng_ctx **ctx);
53f1f0ca	346	int lttng_add_nice_to_ctx(struct lttng_ctx **ctx);
b64bc438 MD	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);
41c3c24e	352	#if defined(CONFIG_PERF_EVENTS) && (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
c24a0d71 MD	353	int lttng_add_perf_counter_to_ctx(uint32_t type,
	354	uint64_t config,
	355	const char *name,
	356	struct lttng_ctx **ctx);
1d443b34 MD	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
02119ee5	367
c337ddc2 MD	368	extern int lttng_statedump_start(struct lttng_session *session);
c337ddc2 MD	369
acd614cc	370	#ifdef CONFIG_KPROBES
f17701fb MD	371	int lttng_kprobes_register(const char *name,
	372	const char *symbol_name,
	373	uint64_t offset,
	374	uint64_t addr,
a90917c3 MD	375	struct lttng_event *event);
	376	void lttng_kprobes_unregister(struct lttng_event *event);
	377	void lttng_kprobes_destroy_private(struct lttng_event *event);
acd614cc MD	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,
a90917c3	384	struct lttng_event *event)
acd614cc MD	385	{
	386	return -ENOSYS;
	387	}
	388
25f53c39	389	static inline
a90917c3	390	void lttng_kprobes_unregister(struct lttng_event *event)
acd614cc MD	391	{
acd614cc MD	392	}
edeb3137 MD	393
edeb3137 MD	394	static inline
a90917c3	395	void lttng_kprobes_destroy_private(struct lttng_event *event)
edeb3137 MD	396	{
edeb3137 MD	397	}
acd614cc	398	#endif
d6d808f3	399
7371f44c MD	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,
a90917c3 MD	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);
7371f44c MD	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,
a90917c3 MD	415	struct lttng_event *event_entry,
a90917c3 MD	416	struct lttng_event *event_exit)
7371f44c MD	417	{
	418	return -ENOSYS;
	419	}
	420
	421	static inline
a90917c3	422	void lttng_kretprobes_unregister(struct lttng_event *event)
7371f44c MD	423	{
	424	}
	425
	426	static inline
a90917c3	427	void lttng_kretprobes_destroy_private(struct lttng_event *event)
7371f44c MD	428	{
	429	}
	430	#endif
	431
e0a7a7c4 MD	432	#ifdef CONFIG_DYNAMIC_FTRACE
	433	int lttng_ftrace_register(const char *name,
	434	const char *symbol_name,
a90917c3 MD	435	struct lttng_event *event);
	436	void lttng_ftrace_unregister(struct lttng_event *event);
	437	void lttng_ftrace_destroy_private(struct lttng_event *event);
e0a7a7c4 MD	438	#else
	439	static inline
	440	int lttng_ftrace_register(const char *name,
	441	const char *symbol_name,
a90917c3	442	struct lttng_event *event)
e0a7a7c4	443	{
acd614cc	444	return -ENOSYS;
e0a7a7c4 MD	445	}
	446
	447	static inline
a90917c3	448	void lttng_ftrace_unregister(struct lttng_event *event)
e0a7a7c4 MD	449	{
e0a7a7c4 MD	450	}
edeb3137 MD	451
edeb3137 MD	452	static inline
a90917c3	453	void lttng_ftrace_destroy_private(struct lttng_event *event)
edeb3137 MD	454	{
edeb3137 MD	455	}
e0a7a7c4	456	#endif
271b6681	457
3db41b2c	458	int lttng_calibrate(struct lttng_kernel_calibrate *calibrate);
57105fc2	459
271b6681 MD	460	extern const struct file_operations lttng_tracepoint_list_fops;
271b6681 MD	461
ef200626 MD	462	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,35))
	463	#define TRACEPOINT_HAS_DATA_ARG
	464	#endif
	465
a90917c3	466	#endif /* _LTTNG_EVENTS_H */