[lttng-ust.git] / include / lttng / ust-events.h

#ifndef _LTTNG_UST_EVENTS_H
#define _LTTNG_UST_EVENTS_H

/*
 * lttng/ust-events.h
 *
 * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Holds LTTng per-session event registry.
 *
 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
 * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
 *
 * Permission is hereby granted to use or copy this program
 * for any purpose,  provided the above notices are retained on all copies.
 * Permission to modify the code and to distribute modified code is granted,
 * provided the above notices are retained, and a notice that the code was
 * modified is included with the above copyright notice.
 */

#include <urcu/list.h>
#include <urcu/hlist.h>
#include <uuid/uuid.h>
#include <stdint.h>
#include <lttng/ust-abi.h>
#include <lttng/ust-tracer.h>
#include <endian.h>
#include <float.h>

struct ltt_channel;
struct ltt_session;
struct lttng_ust_lib_ring_buffer_ctx;

/*
 * Data structures used by tracepoint event declarations, and by the
 * tracer. Those structures have padding for future extension.
 */

/*
 * LTTng client type enumeration. Used by the consumer to map the
 * callbacks from its own address space.
 */
enum lttng_client_types {
	LTTNG_CLIENT_METADATA = 0,
	LTTNG_CLIENT_DISCARD = 1,
	LTTNG_CLIENT_OVERWRITE = 2,
	LTTNG_NR_CLIENT_TYPES,
};

/* 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,
	atype_float,
	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,
};

#define LTTNG_UST_ENUM_ENTRY_PADDING	16
struct lttng_enum_entry {
	unsigned long long start, end;	/* start and end are inclusive */
	const char *string;
	char padding[LTTNG_UST_ENUM_ENTRY_PADDING];
};

#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 = lttng_is_signed_type(_type),	\
		  .reverse_byte_order = _byte_order != __BYTE_ORDER,	\
		  .base = _base,				\
		  .encoding = lttng_encode_##_encoding,		\
		},						\
	}							\

#define LTTNG_UST_INTEGER_TYPE_PADDING	24
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;
	char padding[LTTNG_UST_INTEGER_TYPE_PADDING];
};

/*
 * Only float and double are supported. long double is not supported at
 * the moment.
 */
#define _float_mant_dig(_type)						\
	(sizeof(_type) == sizeof(float) ? FLT_MANT_DIG			\
		: (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG	\
		: 0))

#define __type_float(_type)					\
	{							\
	    .atype = atype_float,				\
	    .u.basic._float =					\
		{						\
		  .exp_dig = sizeof(_type) * CHAR_BIT		\
				- _float_mant_dig(_type),	\
		  .mant_dig = _float_mant_dig(_type),		\
		  .alignment = lttng_alignof(_type) * CHAR_BIT,	\
		  .reverse_byte_order = __BYTE_ORDER != __FLOAT_WORD_ORDER, \
		},						\
	}							\

#define LTTNG_UST_FLOAT_TYPE_PADDING	24
struct lttng_float_type {
	unsigned int exp_dig;		/* exponent digits, in bits */
	unsigned int mant_dig;		/* mantissa digits, in bits */
	unsigned short alignment;	/* in bits */
	unsigned int reverse_byte_order:1;
	char padding[LTTNG_UST_FLOAT_TYPE_PADDING];
};

#define LTTNG_UST_BASIC_TYPE_PADDING	128
union _lttng_basic_type {
	struct lttng_integer_type integer;
	struct {
		const char *name;
	} enumeration;
	struct {
		enum lttng_string_encodings encoding;
	} string;
	struct lttng_float_type _float;
	char padding[LTTNG_UST_BASIC_TYPE_PADDING];
};

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

#define LTTNG_UST_TYPE_PADDING	128
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;
		char padding[LTTNG_UST_TYPE_PADDING];
	} u;
};

#define LTTNG_UST_ENUM_TYPE_PADDING	24
struct lttng_enum {
	const char *name;
	struct lttng_type container_type;
	const struct lttng_enum_entry *entries;
	unsigned int len;
	char padding[LTTNG_UST_ENUM_TYPE_PADDING];
};

/* Event field description */

#define LTTNG_UST_EVENT_FIELD_PADDING	32
struct lttng_event_field {
	const char *name;
	struct lttng_type type;
	char padding[LTTNG_UST_EVENT_FIELD_PADDING];
};

#define LTTNG_UST_CTX_FIELD_PADDING	40
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 lttng_ust_lib_ring_buffer_ctx *ctx,
		       struct ltt_channel *chan);
	union {
		char padding[LTTNG_UST_CTX_FIELD_PADDING];
	} u;
	void (*destroy)(struct lttng_ctx_field *field);
};

#define LTTNG_UST_CTX_PADDING	24
struct lttng_ctx {
	struct lttng_ctx_field *fields;
	unsigned int nr_fields;
	unsigned int allocated_fields;
	char padding[LTTNG_UST_CTX_PADDING];
};

#define LTTNG_UST_EVENT_DESC_PADDING	40
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;
	const int **loglevel;
	char padding[LTTNG_UST_EVENT_DESC_PADDING];
};

#define LTTNG_UST_PROBE_DESC_PADDING	40
struct lttng_probe_desc {
	const char *provider;
	const struct lttng_event_desc **event_desc;
	unsigned int nr_events;
	struct cds_list_head head;		/* chain registered probes */
	char padding[LTTNG_UST_PROBE_DESC_PADDING];
};

/* Data structures used by the tracer. */

/*
 * Entry describing a per-session active wildcard, along with the event
 * attribute and channel information configuring the events that need to
 * be enabled.
 */
struct session_wildcard {
	struct ltt_channel *chan;
	struct lttng_ctx *ctx;	/* TODO */
	struct lttng_ust_event event_param;
	struct cds_list_head events;	/* list of events enabled */
	struct cds_list_head list;	/* per-session list of wildcards */
	struct cds_list_head session_list; /* node of session wildcard list */
	struct wildcard_entry *entry;
	unsigned int enabled:1;
};

/*
 * Entry describing an active wildcard (per name) for all sessions.
 */
struct wildcard_entry {
	/* node of global wildcards list */
	struct cds_list_head list;
	/* head of session list to which this wildcard apply */
	struct cds_list_head session_list;
	enum lttng_ust_loglevel_type loglevel_type;
	int loglevel;
	char name[0];
};

struct tp_list_entry {
	struct lttng_ust_tracepoint_iter tp;
	struct cds_list_head head;
};

struct lttng_ust_tracepoint_list {
	struct tp_list_entry *iter;
	struct cds_list_head head;
};

struct ust_pending_probe;

/*
 * 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_ust_instrumentation instrumentation;
	union {
	} u;
	struct cds_list_head list;		/* Event list */
	struct cds_list_head wildcard_list;	/* Event list for wildcard */
	struct ust_pending_probe *pending_probe;
	unsigned int metadata_dumped:1;
};

struct channel;
struct lttng_ust_shm_handle;

struct ltt_channel_ops {
	struct ltt_channel *(*channel_create)(const char *name,
				void *buf_addr,
				size_t subbuf_size, size_t num_subbuf,
				unsigned int switch_timer_interval,
				unsigned int read_timer_interval,
				int **shm_fd, int **wait_fd,
				uint64_t **memory_map_size,
				struct ltt_channel *chan_priv_init);
	void (*channel_destroy)(struct ltt_channel *ltt_chan);
	struct lttng_ust_lib_ring_buffer *(*buffer_read_open)(struct channel *chan,
				struct lttng_ust_shm_handle *handle,
				int **shm_fd, int **wait_fd,
				uint64_t **memory_map_size);
	void (*buffer_read_close)(struct lttng_ust_lib_ring_buffer *buf,
				struct lttng_ust_shm_handle *handle);
	int (*event_reserve)(struct lttng_ust_lib_ring_buffer_ctx *ctx,
			     uint32_t event_id);
	void (*event_commit)(struct lttng_ust_lib_ring_buffer_ctx *ctx);
	void (*event_write)(struct lttng_ust_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,
				    struct lttng_ust_shm_handle *handle);
	//wait_queue_head_t *(*get_reader_wait_queue)(struct channel *chan);
	//wait_queue_head_t *(*get_hp_wait_queue)(struct channel *chan);
	int (*is_finalized)(struct channel *chan);
	int (*is_disabled)(struct channel *chan);
	int (*flush_buffer)(struct channel *chan, struct lttng_ust_shm_handle *handle);
};

struct ltt_channel {
	/*
	 * The pointers located in this private data are NOT safe to be
	 * dereferenced by the consumer. The only operations the
	 * consumer process is designed to be allowed to do is to read
	 * and perform subbuffer flush.
	 */
	struct channel *chan;		/* Channel buffers */
	int enabled;
	struct lttng_ctx *ctx;
	/* Event ID management */
	struct ltt_session *session;
	int objd;			/* Object associated to channel */
	unsigned int free_event_id;	/* Next event ID to allocate */
	unsigned int used_event_id;	/* Max allocated event IDs */
	struct cds_list_head list;	/* Channel list */
	struct ltt_channel_ops *ops;
	int header_type;		/* 0: unset, 1: compact, 2: large */
	struct lttng_ust_shm_handle *handle;	/* shared-memory handle */
	unsigned int metadata_dumped:1;

	/* Channel ID, available for consumer too */
	unsigned int id;
	/* Copy of session UUID for consumer (availability through shm) */
	uuid_t uuid;			/* Trace session unique ID */
};

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

struct ltt_transport {
	char *name;
	struct cds_list_head node;
	struct ltt_channel_ops ops;
};

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,
				       int **shm_fd, int **wait_fd,
				       uint64_t **memory_map_size,
				       struct ltt_channel *chan_priv_init);
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,
				       int **shm_fd, int **wait_fd,
				       uint64_t **memory_map_size);

int ltt_event_create(struct ltt_channel *chan,
		struct lttng_ust_event *event_param,
		void *filter,
		struct ltt_event **event);

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_probe_register(struct lttng_probe_desc *desc);
void ltt_probe_unregister(struct lttng_probe_desc *desc);
int pending_probe_fix_events(const struct lttng_event_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);
int lttng_find_context(struct lttng_ctx *ctx, const char *name);
struct lttng_ctx_field *lttng_append_context(struct lttng_ctx **ctx_p);
void lttng_remove_context_field(struct lttng_ctx **ctx_p,
				struct lttng_ctx_field *field);
void lttng_destroy_context(struct lttng_ctx *ctx);
int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
int lttng_add_pthread_id_to_ctx(struct lttng_ctx **ctx);
int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
void lttng_context_vtid_reset(void);
void lttng_context_vpid_reset(void);

const struct lttng_ust_lib_ring_buffer_client_cb *lttng_client_callbacks_metadata;
const struct lttng_ust_lib_ring_buffer_client_cb *lttng_client_callbacks_discard;
const struct lttng_ust_lib_ring_buffer_client_cb *lttng_client_callbacks_overwrite;

struct ltt_transport *ltt_transport_find(const char *name);

int ltt_probes_get_event_list(struct lttng_ust_tracepoint_list *list);
void ltt_probes_prune_event_list(struct lttng_ust_tracepoint_list *list);
struct lttng_ust_tracepoint_iter *
	lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list);

int ltt_wildcard_enable(struct session_wildcard *wildcard);
int ltt_wildcard_disable(struct session_wildcard *wildcard);
int ltt_wildcard_create(struct ltt_channel *chan,
	struct lttng_ust_event *event_param,
	struct session_wildcard **sl);
int ltt_loglevel_match(const struct lttng_event_desc *desc,
		enum lttng_ust_loglevel_type req_type,
		int req_loglevel);
void ltt_probes_create_wildcard_events(struct wildcard_entry *entry,
				struct session_wildcard *wildcard);

#endif /* _LTTNG_UST_EVENTS_H */
Commit	Line	Data
	1	#ifndef _LTTNG_UST_EVENTS_H
	2	#define _LTTNG_UST_EVENTS_H
	3
	4	/*
	5	* lttng/ust-events.h
	6	*
	7	* Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	8	*
	9	* Holds LTTng per-session event registry.
	10	*
	11	* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
	12	* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
	13	*
	14	* Permission is hereby granted to use or copy this program
	15	* for any purpose, provided the above notices are retained on all copies.
	16	* Permission to modify the code and to distribute modified code is granted,
	17	* provided the above notices are retained, and a notice that the code was
	18	* modified is included with the above copyright notice.
	19	*/
	20
	21	#include <urcu/list.h>
	22	#include <urcu/hlist.h>
	23	#include <uuid/uuid.h>
	24	#include <stdint.h>
	25	#include <lttng/ust-abi.h>
	26	#include <lttng/ust-tracer.h>
	27	#include <endian.h>
	28	#include <float.h>
	29
	30	struct ltt_channel;
	31	struct ltt_session;
	32	struct lttng_ust_lib_ring_buffer_ctx;
	33
	34	/*
	35	* Data structures used by tracepoint event declarations, and by the
	36	* tracer. Those structures have padding for future extension.
	37	*/
	38
	39	/*
	40	* LTTng client type enumeration. Used by the consumer to map the
	41	* callbacks from its own address space.
	42	*/
	43	enum lttng_client_types {
	44	LTTNG_CLIENT_METADATA = 0,
	45	LTTNG_CLIENT_DISCARD = 1,
	46	LTTNG_CLIENT_OVERWRITE = 2,
	47	LTTNG_NR_CLIENT_TYPES,
	48	};
	49
	50	/* Type description */
	51
	52	/* Update the astract_types name table in lttng-types.c along with this enum */
	53	enum abstract_types {
	54	atype_integer,
	55	atype_enum,
	56	atype_array,
	57	atype_sequence,
	58	atype_string,
	59	atype_float,
	60	NR_ABSTRACT_TYPES,
	61	};
	62
	63	/* Update the string_encodings name table in lttng-types.c along with this enum */
	64	enum lttng_string_encodings {
	65	lttng_encode_none = 0,
	66	lttng_encode_UTF8 = 1,
	67	lttng_encode_ASCII = 2,
	68	NR_STRING_ENCODINGS,
	69	};
	70
	71	#define LTTNG_UST_ENUM_ENTRY_PADDING 16
	72	struct lttng_enum_entry {
	73	unsigned long long start, end; /* start and end are inclusive */
	74	const char *string;
	75	char padding[LTTNG_UST_ENUM_ENTRY_PADDING];
	76	};
	77
	78	#define __type_integer(_type, _byte_order, _base, _encoding) \
	79	{ \
	80	.atype = atype_integer, \
	81	.u.basic.integer = \
	82	{ \
	83	.size = sizeof(_type) * CHAR_BIT, \
	84	.alignment = lttng_alignof(_type) * CHAR_BIT, \
	85	.signedness = lttng_is_signed_type(_type), \
	86	.reverse_byte_order = _byte_order != __BYTE_ORDER, \
	87	.base = _base, \
	88	.encoding = lttng_encode_##_encoding, \
	89	}, \
	90	} \
	91
	92	#define LTTNG_UST_INTEGER_TYPE_PADDING 24
	93	struct lttng_integer_type {
	94	unsigned int size; /* in bits */
	95	unsigned short alignment; /* in bits */
	96	unsigned int signedness:1;
	97	unsigned int reverse_byte_order:1;
	98	unsigned int base; /* 2, 8, 10, 16, for pretty print */
	99	enum lttng_string_encodings encoding;
	100	char padding[LTTNG_UST_INTEGER_TYPE_PADDING];
	101	};
	102
	103	/*
	104	* Only float and double are supported. long double is not supported at
	105	* the moment.
	106	*/
	107	#define _float_mant_dig(_type) \
	108	(sizeof(_type) == sizeof(float) ? FLT_MANT_DIG \
	109	: (sizeof(_type) == sizeof(double) ? DBL_MANT_DIG \
	110	: 0))
	111
	112	#define __type_float(_type) \
	113	{ \
	114	.atype = atype_float, \
	115	.u.basic._float = \
	116	{ \
	117	.exp_dig = sizeof(_type) * CHAR_BIT \
	118	- _float_mant_dig(_type), \
	119	.mant_dig = _float_mant_dig(_type), \
	120	.alignment = lttng_alignof(_type) * CHAR_BIT, \
	121	.reverse_byte_order = __BYTE_ORDER != __FLOAT_WORD_ORDER, \
	122	}, \
	123	} \
	124
	125	#define LTTNG_UST_FLOAT_TYPE_PADDING 24
	126	struct lttng_float_type {
	127	unsigned int exp_dig; /* exponent digits, in bits */
	128	unsigned int mant_dig; /* mantissa digits, in bits */
	129	unsigned short alignment; /* in bits */
	130	unsigned int reverse_byte_order:1;
	131	char padding[LTTNG_UST_FLOAT_TYPE_PADDING];
	132	};
	133
	134	#define LTTNG_UST_BASIC_TYPE_PADDING 128
	135	union _lttng_basic_type {
	136	struct lttng_integer_type integer;
	137	struct {
	138	const char *name;
	139	} enumeration;
	140	struct {
	141	enum lttng_string_encodings encoding;
	142	} string;
	143	struct lttng_float_type _float;
	144	char padding[LTTNG_UST_BASIC_TYPE_PADDING];
	145	};
	146
	147	struct lttng_basic_type {
	148	enum abstract_types atype;
	149	union {
	150	union _lttng_basic_type basic;
	151	} u;
	152	};
	153
	154	#define LTTNG_UST_TYPE_PADDING 128
	155	struct lttng_type {
	156	enum abstract_types atype;
	157	union {
	158	union _lttng_basic_type basic;
	159	struct {
	160	struct lttng_basic_type elem_type;
	161	unsigned int length; /* num. elems. */
	162	} array;
	163	struct {
	164	struct lttng_basic_type length_type;
	165	struct lttng_basic_type elem_type;
	166	} sequence;
	167	char padding[LTTNG_UST_TYPE_PADDING];
	168	} u;
	169	};
	170
	171	#define LTTNG_UST_ENUM_TYPE_PADDING 24
	172	struct lttng_enum {
	173	const char *name;
	174	struct lttng_type container_type;
	175	const struct lttng_enum_entry *entries;
	176	unsigned int len;
	177	char padding[LTTNG_UST_ENUM_TYPE_PADDING];
	178	};
	179
	180	/* Event field description */
	181
	182	#define LTTNG_UST_EVENT_FIELD_PADDING 32
	183	struct lttng_event_field {
	184	const char *name;
	185	struct lttng_type type;
	186	char padding[LTTNG_UST_EVENT_FIELD_PADDING];
	187	};
	188
	189	#define LTTNG_UST_CTX_FIELD_PADDING 40
	190	struct lttng_ctx_field {
	191	struct lttng_event_field event_field;
	192	size_t (*get_size)(size_t offset);
	193	void (record)(struct lttng_ctx_field field,
	194	struct lttng_ust_lib_ring_buffer_ctx *ctx,
	195	struct ltt_channel *chan);
	196	union {
	197	char padding[LTTNG_UST_CTX_FIELD_PADDING];
	198	} u;
	199	void (destroy)(struct lttng_ctx_field field);
	200	};
	201
	202	#define LTTNG_UST_CTX_PADDING 24
	203	struct lttng_ctx {
	204	struct lttng_ctx_field *fields;
	205	unsigned int nr_fields;
	206	unsigned int allocated_fields;
	207	char padding[LTTNG_UST_CTX_PADDING];
	208	};
	209
	210	#define LTTNG_UST_EVENT_DESC_PADDING 40
	211	struct lttng_event_desc {
	212	const char *name;
	213	void *probe_callback;
	214	const struct lttng_event_ctx ctx; / context */
	215	const struct lttng_event_field fields; / event payload */
	216	unsigned int nr_fields;
	217	const int **loglevel;
	218	char padding[LTTNG_UST_EVENT_DESC_PADDING];
	219	};
	220
	221	#define LTTNG_UST_PROBE_DESC_PADDING 40
	222	struct lttng_probe_desc {
	223	const char *provider;
	224	const struct lttng_event_desc **event_desc;
	225	unsigned int nr_events;
	226	struct cds_list_head head; /* chain registered probes */
	227	char padding[LTTNG_UST_PROBE_DESC_PADDING];
	228	};
	229
	230	/* Data structures used by the tracer. */
	231
	232	/*
	233	* Entry describing a per-session active wildcard, along with the event
	234	* attribute and channel information configuring the events that need to
	235	* be enabled.
	236	*/
	237	struct session_wildcard {
	238	struct ltt_channel *chan;
	239	struct lttng_ctx ctx; / TODO */
	240	struct lttng_ust_event event_param;
	241	struct cds_list_head events; /* list of events enabled */
	242	struct cds_list_head list; /* per-session list of wildcards */
	243	struct cds_list_head session_list; /* node of session wildcard list */
	244	struct wildcard_entry *entry;
	245	unsigned int enabled:1;
	246	};
	247
	248	/*
	249	* Entry describing an active wildcard (per name) for all sessions.
	250	*/
	251	struct wildcard_entry {
	252	/* node of global wildcards list */
	253	struct cds_list_head list;
	254	/* head of session list to which this wildcard apply */
	255	struct cds_list_head session_list;
	256	enum lttng_ust_loglevel_type loglevel_type;
	257	int loglevel;
	258	char name[0];
	259	};
	260
	261	struct tp_list_entry {
	262	struct lttng_ust_tracepoint_iter tp;
	263	struct cds_list_head head;
	264	};
	265
	266	struct lttng_ust_tracepoint_list {
	267	struct tp_list_entry *iter;
	268	struct cds_list_head head;
	269	};
	270
	271	struct ust_pending_probe;
	272
	273	/*
	274	* ltt_event structure is referred to by the tracing fast path. It must be
	275	* kept small.
	276	*/
	277	struct ltt_event {
	278	unsigned int id;
	279	struct ltt_channel *chan;
	280	int enabled;
	281	const struct lttng_event_desc *desc;
	282	void *filter;
	283	struct lttng_ctx *ctx;
	284	enum lttng_ust_instrumentation instrumentation;
	285	union {
	286	} u;
	287	struct cds_list_head list; /* Event list */
	288	struct cds_list_head wildcard_list; /* Event list for wildcard */
	289	struct ust_pending_probe *pending_probe;
	290	unsigned int metadata_dumped:1;
	291	};
	292
	293	struct channel;
	294	struct lttng_ust_shm_handle;
	295
	296	struct ltt_channel_ops {
	297	struct ltt_channel (channel_create)(const char *name,
	298	void *buf_addr,
	299	size_t subbuf_size, size_t num_subbuf,
	300	unsigned int switch_timer_interval,
	301	unsigned int read_timer_interval,
	302	int shm_fd, int wait_fd,
	303	uint64_t **memory_map_size,
	304	struct ltt_channel *chan_priv_init);
	305	void (channel_destroy)(struct ltt_channel ltt_chan);
	306	struct lttng_ust_lib_ring_buffer (buffer_read_open)(struct channel *chan,
	307	struct lttng_ust_shm_handle *handle,
	308	int shm_fd, int wait_fd,
	309	uint64_t **memory_map_size);
	310	void (buffer_read_close)(struct lttng_ust_lib_ring_buffer buf,
	311	struct lttng_ust_shm_handle *handle);
	312	int (event_reserve)(struct lttng_ust_lib_ring_buffer_ctx ctx,
	313	uint32_t event_id);
	314	void (event_commit)(struct lttng_ust_lib_ring_buffer_ctx ctx);
	315	void (event_write)(struct lttng_ust_lib_ring_buffer_ctx ctx, const void *src,
	316	size_t len);
	317	/*
	318	* packet_avail_size returns the available size in the current
	319	* packet. Note that the size returned is only a hint, since it
	320	* may change due to concurrent writes.
	321	*/
	322	size_t (packet_avail_size)(struct channel chan,
	323	struct lttng_ust_shm_handle *handle);
	324	//wait_queue_head_t (get_reader_wait_queue)(struct channel *chan);
	325	//wait_queue_head_t (get_hp_wait_queue)(struct channel *chan);
	326	int (is_finalized)(struct channel chan);
	327	int (is_disabled)(struct channel chan);
	328	int (flush_buffer)(struct channel chan, struct lttng_ust_shm_handle *handle);
	329	};
	330
	331	struct ltt_channel {
	332	/*
	333	* The pointers located in this private data are NOT safe to be
	334	* dereferenced by the consumer. The only operations the
	335	* consumer process is designed to be allowed to do is to read
	336	* and perform subbuffer flush.
	337	*/
	338	struct channel chan; / Channel buffers */
	339	int enabled;
	340	struct lttng_ctx *ctx;
	341	/* Event ID management */
	342	struct ltt_session *session;
	343	int objd; /* Object associated to channel */
	344	unsigned int free_event_id; /* Next event ID to allocate */
	345	unsigned int used_event_id; /* Max allocated event IDs */
	346	struct cds_list_head list; /* Channel list */
	347	struct ltt_channel_ops *ops;
	348	int header_type; /* 0: unset, 1: compact, 2: large */
	349	struct lttng_ust_shm_handle handle; / shared-memory handle */
	350	unsigned int metadata_dumped:1;
	351
	352	/* Channel ID, available for consumer too */
	353	unsigned int id;
	354	/* Copy of session UUID for consumer (availability through shm) */
	355	uuid_t uuid; /* Trace session unique ID */
	356	};
	357
	358	struct ltt_session {
	359	int active; /* Is trace session active ? */
	360	int been_active; /* Has trace session been active ? */
	361	int objd; /* Object associated to session */
	362	struct ltt_channel metadata; / Metadata channel */
	363	struct cds_list_head chan; /* Channel list head */
	364	struct cds_list_head events; /* Event list head */
	365	struct cds_list_head wildcards; /* Wildcard list head */
	366	struct cds_list_head list; /* Session list */
	367	unsigned int free_chan_id; /* Next chan ID to allocate */
	368	uuid_t uuid; /* Trace session unique ID */
	369	unsigned int metadata_dumped:1;
	370	};
	371
	372	struct ltt_transport {
	373	char *name;
	374	struct cds_list_head node;
	375	struct ltt_channel_ops ops;
	376	};
	377
	378	struct ltt_session *ltt_session_create(void);
	379	int ltt_session_enable(struct ltt_session *session);
	380	int ltt_session_disable(struct ltt_session *session);
	381	void ltt_session_destroy(struct ltt_session *session);
	382
	383	struct ltt_channel ltt_channel_create(struct ltt_session session,
	384	const char *transport_name,
	385	void *buf_addr,
	386	size_t subbuf_size, size_t num_subbuf,
	387	unsigned int switch_timer_interval,
	388	unsigned int read_timer_interval,
	389	int shm_fd, int wait_fd,
	390	uint64_t **memory_map_size,
	391	struct ltt_channel *chan_priv_init);
	392	struct ltt_channel ltt_global_channel_create(struct ltt_session session,
	393	int overwrite, void *buf_addr,
	394	size_t subbuf_size, size_t num_subbuf,
	395	unsigned int switch_timer_interval,
	396	unsigned int read_timer_interval,
	397	int shm_fd, int wait_fd,
	398	uint64_t **memory_map_size);
	399
	400	int ltt_event_create(struct ltt_channel *chan,
	401	struct lttng_ust_event *event_param,
	402	void *filter,
	403	struct ltt_event **event);
	404
	405	int ltt_channel_enable(struct ltt_channel *channel);
	406	int ltt_channel_disable(struct ltt_channel *channel);
	407	int ltt_event_enable(struct ltt_event *event);
	408	int ltt_event_disable(struct ltt_event *event);
	409
	410	void ltt_transport_register(struct ltt_transport *transport);
	411	void ltt_transport_unregister(struct ltt_transport *transport);
	412
	413	void synchronize_trace(void);
	414
	415	int ltt_probe_register(struct lttng_probe_desc *desc);
	416	void ltt_probe_unregister(struct lttng_probe_desc *desc);
	417	int pending_probe_fix_events(const struct lttng_event_desc *desc);
	418	const struct lttng_event_desc ltt_event_get(const char name);
	419	void ltt_event_put(const struct lttng_event_desc *desc);
	420	int ltt_probes_init(void);
	421	void ltt_probes_exit(void);
	422	int lttng_find_context(struct lttng_ctx ctx, const char name);
	423	struct lttng_ctx_field lttng_append_context(struct lttng_ctx *ctx_p);
	424	void lttng_remove_context_field(struct lttng_ctx **ctx_p,
	425	struct lttng_ctx_field *field);
	426	void lttng_destroy_context(struct lttng_ctx *ctx);
	427	int lttng_add_vtid_to_ctx(struct lttng_ctx **ctx);
	428	int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx);
	429	int lttng_add_pthread_id_to_ctx(struct lttng_ctx **ctx);
	430	int lttng_add_procname_to_ctx(struct lttng_ctx **ctx);
	431	void lttng_context_vtid_reset(void);
	432	void lttng_context_vpid_reset(void);
	433
	434	const struct lttng_ust_lib_ring_buffer_client_cb *lttng_client_callbacks_metadata;
	435	const struct lttng_ust_lib_ring_buffer_client_cb *lttng_client_callbacks_discard;
	436	const struct lttng_ust_lib_ring_buffer_client_cb *lttng_client_callbacks_overwrite;
	437
	438	struct ltt_transport ltt_transport_find(const char name);
	439
	440	int ltt_probes_get_event_list(struct lttng_ust_tracepoint_list *list);
	441	void ltt_probes_prune_event_list(struct lttng_ust_tracepoint_list *list);
	442	struct lttng_ust_tracepoint_iter *
	443	lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list);
	444
	445	int ltt_wildcard_enable(struct session_wildcard *wildcard);
	446	int ltt_wildcard_disable(struct session_wildcard *wildcard);
	447	int ltt_wildcard_create(struct ltt_channel *chan,
	448	struct lttng_ust_event *event_param,
	449	struct session_wildcard **sl);
	450	int ltt_loglevel_match(const struct lttng_event_desc *desc,
	451	enum lttng_ust_loglevel_type req_type,
	452	int req_loglevel);
	453	void ltt_probes_create_wildcard_events(struct wildcard_entry *entry,
	454	struct session_wildcard *wildcard);
	455
	456	#endif /* _LTTNG_UST_EVENTS_H */