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

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

#include <lttng/lttng.h>
#include <common/hashtable/hashtable.h>

#include "consumer.h"
#include "lttng-ust-ctl.h"
#include "ust-registry.h"

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

struct buffer_reg_session {
	/* Registry per domain. */
	union {
		struct 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(void);
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(void);
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(void);

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
7972aab2	1	/*
ab5be9fa	2	* Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
7972aab2	3	*
ab5be9fa	4	* SPDX-License-Identifier: GPL-2.0-only
7972aab2	5	*
7972aab2 DG	6	*/
	7
	8	#ifndef LTTNG_BUFFER_REGISTRY_H
	9	#define LTTNG_BUFFER_REGISTRY_H
	10
	11	#include <stdint.h>
7972aab2 DG	12	#include <urcu/list.h>
	13
	14	#include <lttng/lttng.h>
	15	#include <common/hashtable/hashtable.h>
	16
	17	#include "consumer.h"
75018ab6	18	#include "lttng-ust-ctl.h"
7972aab2 DG	19	#include "ust-registry.h"
	20
	21	struct buffer_reg_stream {
	22	struct cds_list_head lnode;
	23	union {
	24	/* Original object data that MUST be copied over. */
	25	struct lttng_ust_object_data *ust;
	26	} obj;
	27	};
	28
	29	struct buffer_reg_channel {
	30	/* This key is the same as a tracing channel key. */
	31	uint32_t key;
	32	/* Key of the channel on the consumer side. */
	33	uint64_t consumer_key;
	34	/* Stream registry object of this channel registry. */
	35	struct cds_list_head streams;
5c786ded JD	36	/* Total number of stream in the list. */
5c786ded JD	37	uint64_t stream_count;
7972aab2 DG	38	/* Used to ensure mutual exclusion to the stream's list. */
	39	pthread_mutex_t stream_list_lock;
	40	/* Node for hash table usage. */
	41	struct lttng_ht_node_u64 node;
8c924c7b MD	42	/* Size of subbuffers in this channel. */
8c924c7b MD	43	size_t subbuf_size;
d07ceecd MD	44	/* Number of subbuffers per stream. */
d07ceecd MD	45	size_t num_subbuf;
7972aab2 DG	46	union {
	47	/* Original object data that MUST be copied over. */
	48	struct lttng_ust_object_data *ust;
	49	} obj;
	50	};
	51
	52	struct buffer_reg_session {
	53	/* Registry per domain. */
	54	union {
	55	struct ust_registry_session *ust;
	56	} reg;
	57
	58	/* Contains buffer registry channel indexed by tracing channel key. */
	59	struct lttng_ht *channels;
	60	};
	61
	62	/*
	63	* Registry object for per UID buffers.
	64	*/
	65	struct buffer_reg_uid {
	66	/*
	67	* Keys to match this object in a hash table. The following three variables
	68	* identify a unique per UID buffer registry.
	69	*/
d9bf3ca4	70	uint64_t session_id; /* Unique tracing session id. */
7972aab2 DG	71	int bits_per_long; /* ABI */
	72	uid_t uid; /* Owner. */
	73
	74	enum lttng_domain_type domain;
	75	struct buffer_reg_session *registry;
	76
	77	/* Indexed by session id. */
	78	struct lttng_ht_node_u64 node;
	79	/* Node of a linked list used to teardown object at a destroy session. */
	80	struct cds_list_head lnode;
d7ba1388	81
3d071855	82	char root_shm_path[PATH_MAX];
d7ba1388	83	char shm_path[PATH_MAX];
7972aab2 DG	84	};
	85
	86	/*
	87	* Registry object for per PID buffers.
	88	*/
	89	struct buffer_reg_pid {
d9bf3ca4	90	uint64_t session_id;
7972aab2 DG	91
	92	struct buffer_reg_session *registry;
	93
	94	/* Indexed by session id. */
d9bf3ca4	95	struct lttng_ht_node_u64 node;
d7ba1388	96
3d071855	97	char root_shm_path[PATH_MAX];
d7ba1388	98	char shm_path[PATH_MAX];
7972aab2 DG	99	};
	100
	101	/* Buffer registry per UID. */
	102	void buffer_reg_init_uid_registry(void);
d9bf3ca4	103	int buffer_reg_uid_create(uint64_t session_id, uint32_t bits_per_long, uid_t uid,
d7ba1388	104	enum lttng_domain_type domain, struct buffer_reg_uid **regp,
3d071855	105	const char root_shm_path, const char shm_path);
7972aab2	106	void buffer_reg_uid_add(struct buffer_reg_uid *reg);
d9bf3ca4	107	struct buffer_reg_uid *buffer_reg_uid_find(uint64_t session_id,
7972aab2 DG	108	uint32_t bits_per_long, uid_t uid);
	109	void buffer_reg_uid_remove(struct buffer_reg_uid *regp);
	110	void buffer_reg_uid_destroy(struct buffer_reg_uid *regp,
	111	struct consumer_output *consumer);
	112
	113	/* Buffer registry per PID. */
	114	void buffer_reg_init_pid_registry(void);
d7ba1388	115	int buffer_reg_pid_create(uint64_t session_id, struct buffer_reg_pid **regp,
3d071855	116	const char root_shm_path, const char shm_path);
7972aab2	117	void buffer_reg_pid_add(struct buffer_reg_pid *reg);
d9bf3ca4	118	struct buffer_reg_pid *buffer_reg_pid_find(uint64_t session_id);
7972aab2 DG	119	void buffer_reg_pid_remove(struct buffer_reg_pid *regp);
	120	void buffer_reg_pid_destroy(struct buffer_reg_pid *regp);
	121
	122	/* Channel */
	123	int buffer_reg_channel_create(uint64_t key, struct buffer_reg_channel **regp);
	124	void buffer_reg_channel_add(struct buffer_reg_session *session,
	125	struct buffer_reg_channel *channel);
	126	struct buffer_reg_channel *buffer_reg_channel_find(uint64_t key,
	127	struct buffer_reg_uid *reg);
	128	void buffer_reg_channel_remove(struct buffer_reg_session *session,
	129	struct buffer_reg_channel *regp);
	130	void buffer_reg_channel_destroy(struct buffer_reg_channel *regp,
	131	enum lttng_domain_type domain);
	132
	133	/* Stream */
	134	int buffer_reg_stream_create(struct buffer_reg_stream **regp);
	135	void buffer_reg_stream_add(struct buffer_reg_stream *stream,
	136	struct buffer_reg_channel *channel);
	137	void buffer_reg_stream_destroy(struct buffer_reg_stream *regp,
	138	enum lttng_domain_type domain);
	139
7972aab2 DG	140	/* Global registry. */
	141	void buffer_reg_destroy_registries(void);
	142
fb83fe64 JD	143	int buffer_reg_uid_consumer_channel_key(
fb83fe64 JD	144	struct cds_list_head *buffer_reg_uid_list,
76604852	145	uint64_t chan_key, uint64_t *consumer_chan_key);
fb83fe64	146
7972aab2	147	#endif /* LTTNG_BUFFER_REGISTRY_H */