[lttng-tools.git] / src / bin / lttng-sessiond / buffer-registry.hpp

/*
 * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 */

#ifndef LTTNG_BUFFER_REGISTRY_H
#define LTTNG_BUFFER_REGISTRY_H

#include "consumer.hpp"
#include "lttng-ust-ctl.hpp"
#include "ust-registry-session.hpp"
#include "ust-registry.hpp"

#include <common/hashtable/hashtable.hpp>

#include <lttng/lttng.h>

#include <stdint.h>
#include <urcu/list.h>

struct buffer_reg_stream {
	struct cds_list_head lnode;
	union {
		/* Original object data that MUST be copied over. */
		struct lttng_ust_abi_object_data *ust;
	} obj;
};

struct buffer_reg_channel {
	/* This key is the same as a tracing channel key. */
	uint32_t key;
	/* Key of the channel on the consumer side. */
	uint64_t consumer_key;
	/* Stream registry object of this channel registry. */
	struct cds_list_head streams;
	/* Total number of stream in the list. */
	uint64_t stream_count;
	/* Used to ensure mutual exclusion to the stream's list. */
	pthread_mutex_t stream_list_lock;
	/* Node for hash table usage. */
	struct lttng_ht_node_u64 node;
	/* Size of subbuffers in this channel. */
	size_t subbuf_size;
	/* Number of subbuffers per stream. */
	size_t num_subbuf;
	union {
		/* Original object data that MUST be copied over. */
		struct lttng_ust_abi_object_data *ust;
	} obj;
};

struct buffer_reg_session {
	/* Registry per domain. */
	union {
		lttng::sessiond::ust::registry_session *ust;
	} reg;

	/* Contains buffer registry channel indexed by tracing channel key. */
	struct lttng_ht *channels;
};

/*
 * Registry object for per UID buffers.
 */
struct buffer_reg_uid {
	/*
	 * Keys to match this object in a hash table. The following three variables
	 * identify a unique per UID buffer registry.
	 */
	uint64_t session_id; /* Unique tracing session id. */
	int bits_per_long; /* ABI */
	uid_t uid; /* Owner. */

	enum lttng_domain_type domain;
	struct buffer_reg_session *registry;

	/* Indexed by session id. */
	struct lttng_ht_node_u64 node;
	/* Node of a linked list used to teardown object at a destroy session. */
	struct cds_list_head lnode;

	char root_shm_path[PATH_MAX];
	char shm_path[PATH_MAX];
};

/*
 * Registry object for per PID buffers.
 */
struct buffer_reg_pid {
	uint64_t session_id;

	struct buffer_reg_session *registry;

	/* Indexed by session id. */
	struct lttng_ht_node_u64 node;

	char root_shm_path[PATH_MAX];
	char shm_path[PATH_MAX];
};

/* Buffer registry per UID. */
void buffer_reg_init_uid_registry();
int buffer_reg_uid_create(uint64_t session_id,
			  uint32_t bits_per_long,
			  uid_t uid,
			  enum lttng_domain_type domain,
			  struct buffer_reg_uid **regp,
			  const char *root_shm_path,
			  const char *shm_path);
void buffer_reg_uid_add(struct buffer_reg_uid *reg);
struct buffer_reg_uid *buffer_reg_uid_find(uint64_t session_id, uint32_t bits_per_long, uid_t uid);
void buffer_reg_uid_remove(struct buffer_reg_uid *regp);
void buffer_reg_uid_destroy(struct buffer_reg_uid *regp, struct consumer_output *consumer);

/* Buffer registry per PID. */
void buffer_reg_init_pid_registry();
int buffer_reg_pid_create(uint64_t session_id,
			  struct buffer_reg_pid **regp,
			  const char *root_shm_path,
			  const char *shm_path);
void buffer_reg_pid_add(struct buffer_reg_pid *reg);
struct buffer_reg_pid *buffer_reg_pid_find(uint64_t session_id);
void buffer_reg_pid_remove(struct buffer_reg_pid *regp);
void buffer_reg_pid_destroy(struct buffer_reg_pid *regp);

/* Channel */
int buffer_reg_channel_create(uint64_t key, struct buffer_reg_channel **regp);
void buffer_reg_channel_add(struct buffer_reg_session *session, struct buffer_reg_channel *channel);
struct buffer_reg_channel *buffer_reg_channel_find(uint64_t key, struct buffer_reg_uid *reg);
void buffer_reg_channel_remove(struct buffer_reg_session *session, struct buffer_reg_channel *regp);
void buffer_reg_channel_destroy(struct buffer_reg_channel *regp, enum lttng_domain_type domain);

/* Stream */
int buffer_reg_stream_create(struct buffer_reg_stream **regp);
void buffer_reg_stream_add(struct buffer_reg_stream *stream, struct buffer_reg_channel *channel);
void buffer_reg_stream_destroy(struct buffer_reg_stream *regp, enum lttng_domain_type domain);

/* Global registry. */
void buffer_reg_destroy_registries();

int buffer_reg_uid_consumer_channel_key(struct cds_list_head *buffer_reg_uid_list,
					uint64_t chan_key,
					uint64_t *consumer_chan_key);

#endif /* LTTNG_BUFFER_REGISTRY_H */
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
	3	*
	4	* SPDX-License-Identifier: GPL-2.0-only
	5	*
	6	*/
	7
	8	#ifndef LTTNG_BUFFER_REGISTRY_H
	9	#define LTTNG_BUFFER_REGISTRY_H
	10
	11	#include "consumer.hpp"
	12	#include "lttng-ust-ctl.hpp"
	13	#include "ust-registry-session.hpp"
	14	#include "ust-registry.hpp"
	15
	16	#include <common/hashtable/hashtable.hpp>
	17
	18	#include <lttng/lttng.h>
	19
	20	#include <stdint.h>
	21	#include <urcu/list.h>
	22
	23	struct buffer_reg_stream {
	24	struct cds_list_head lnode;
	25	union {
	26	/* Original object data that MUST be copied over. */
	27	struct lttng_ust_abi_object_data *ust;
	28	} obj;
	29	};
	30
	31	struct buffer_reg_channel {
	32	/* This key is the same as a tracing channel key. */
	33	uint32_t key;
	34	/* Key of the channel on the consumer side. */
	35	uint64_t consumer_key;
	36	/* Stream registry object of this channel registry. */
	37	struct cds_list_head streams;
	38	/* Total number of stream in the list. */
	39	uint64_t stream_count;
	40	/* Used to ensure mutual exclusion to the stream's list. */
	41	pthread_mutex_t stream_list_lock;
	42	/* Node for hash table usage. */
	43	struct lttng_ht_node_u64 node;
	44	/* Size of subbuffers in this channel. */
	45	size_t subbuf_size;
	46	/* Number of subbuffers per stream. */
	47	size_t num_subbuf;
	48	union {
	49	/* Original object data that MUST be copied over. */
	50	struct lttng_ust_abi_object_data *ust;
	51	} obj;
	52	};
	53
	54	struct buffer_reg_session {
	55	/* Registry per domain. */
	56	union {
	57	lttng::sessiond::ust::registry_session *ust;
	58	} reg;
	59
	60	/* Contains buffer registry channel indexed by tracing channel key. */
	61	struct lttng_ht *channels;
	62	};
	63
	64	/*
	65	* Registry object for per UID buffers.
	66	*/
	67	struct buffer_reg_uid {
	68	/*
	69	* Keys to match this object in a hash table. The following three variables
	70	* identify a unique per UID buffer registry.
	71	*/
	72	uint64_t session_id; /* Unique tracing session id. */
	73	int bits_per_long; /* ABI */
	74	uid_t uid; /* Owner. */
	75
	76	enum lttng_domain_type domain;
	77	struct buffer_reg_session *registry;
	78
	79	/* Indexed by session id. */
	80	struct lttng_ht_node_u64 node;
	81	/* Node of a linked list used to teardown object at a destroy session. */
	82	struct cds_list_head lnode;
	83
	84	char root_shm_path[PATH_MAX];
	85	char shm_path[PATH_MAX];
	86	};
	87
	88	/*
	89	* Registry object for per PID buffers.
	90	*/
	91	struct buffer_reg_pid {
	92	uint64_t session_id;
	93
	94	struct buffer_reg_session *registry;
	95
	96	/* Indexed by session id. */
	97	struct lttng_ht_node_u64 node;
	98
	99	char root_shm_path[PATH_MAX];
	100	char shm_path[PATH_MAX];
	101	};
	102
	103	/* Buffer registry per UID. */
	104	void buffer_reg_init_uid_registry();
	105	int buffer_reg_uid_create(uint64_t session_id,
	106	uint32_t bits_per_long,
	107	uid_t uid,
	108	enum lttng_domain_type domain,
	109	struct buffer_reg_uid **regp,
	110	const char *root_shm_path,
	111	const char *shm_path);
	112	void buffer_reg_uid_add(struct buffer_reg_uid *reg);
	113	struct buffer_reg_uid *buffer_reg_uid_find(uint64_t session_id, uint32_t bits_per_long, uid_t uid);
	114	void buffer_reg_uid_remove(struct buffer_reg_uid *regp);
	115	void buffer_reg_uid_destroy(struct buffer_reg_uid regp, struct consumer_output consumer);
	116
	117	/* Buffer registry per PID. */
	118	void buffer_reg_init_pid_registry();
	119	int buffer_reg_pid_create(uint64_t session_id,
	120	struct buffer_reg_pid **regp,
	121	const char *root_shm_path,
	122	const char *shm_path);
	123	void buffer_reg_pid_add(struct buffer_reg_pid *reg);
	124	struct buffer_reg_pid *buffer_reg_pid_find(uint64_t session_id);
	125	void buffer_reg_pid_remove(struct buffer_reg_pid *regp);
	126	void buffer_reg_pid_destroy(struct buffer_reg_pid *regp);
	127
	128	/* Channel */
	129	int buffer_reg_channel_create(uint64_t key, struct buffer_reg_channel **regp);
	130	void buffer_reg_channel_add(struct buffer_reg_session session, struct buffer_reg_channel channel);
	131	struct buffer_reg_channel buffer_reg_channel_find(uint64_t key, struct buffer_reg_uid reg);
	132	void buffer_reg_channel_remove(struct buffer_reg_session session, struct buffer_reg_channel regp);
	133	void buffer_reg_channel_destroy(struct buffer_reg_channel *regp, enum lttng_domain_type domain);
	134
	135	/* Stream */
	136	int buffer_reg_stream_create(struct buffer_reg_stream **regp);
	137	void buffer_reg_stream_add(struct buffer_reg_stream stream, struct buffer_reg_channel channel);
	138	void buffer_reg_stream_destroy(struct buffer_reg_stream *regp, enum lttng_domain_type domain);
	139
	140	/* Global registry. */
	141	void buffer_reg_destroy_registries();
	142
	143	int buffer_reg_uid_consumer_channel_key(struct cds_list_head *buffer_reg_uid_list,
	144	uint64_t chan_key,
	145	uint64_t *consumer_chan_key);
	146
	147	#endif /* LTTNG_BUFFER_REGISTRY_H */