| 1 | /* |
| 2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License, version 2 only, as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 51 |
| 15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #ifndef LTTNG_BUFFER_REGISTRY_H |
| 19 | #define LTTNG_BUFFER_REGISTRY_H |
| 20 | |
| 21 | #include <stdint.h> |
| 22 | #include <urcu/list.h> |
| 23 | |
| 24 | #include <lttng/lttng.h> |
| 25 | #include <common/hashtable/hashtable.h> |
| 26 | |
| 27 | #include "consumer.h" |
| 28 | #include "ust-ctl.h" |
| 29 | #include "ust-registry.h" |
| 30 | |
| 31 | struct buffer_reg_stream { |
| 32 | struct cds_list_head lnode; |
| 33 | union { |
| 34 | /* Original object data that MUST be copied over. */ |
| 35 | struct lttng_ust_object_data *ust; |
| 36 | } obj; |
| 37 | }; |
| 38 | |
| 39 | struct buffer_reg_channel { |
| 40 | /* This key is the same as a tracing channel key. */ |
| 41 | uint32_t key; |
| 42 | /* Key of the channel on the consumer side. */ |
| 43 | uint64_t consumer_key; |
| 44 | /* Stream registry object of this channel registry. */ |
| 45 | struct cds_list_head streams; |
| 46 | /* Total number of stream in the list. */ |
| 47 | uint64_t stream_count; |
| 48 | /* Used to ensure mutual exclusion to the stream's list. */ |
| 49 | pthread_mutex_t stream_list_lock; |
| 50 | /* Node for hash table usage. */ |
| 51 | struct lttng_ht_node_u64 node; |
| 52 | /* Size of subbuffers in this channel. */ |
| 53 | size_t subbuf_size; |
| 54 | /* Number of subbuffers per stream. */ |
| 55 | size_t num_subbuf; |
| 56 | union { |
| 57 | /* Original object data that MUST be copied over. */ |
| 58 | struct lttng_ust_object_data *ust; |
| 59 | } obj; |
| 60 | }; |
| 61 | |
| 62 | struct buffer_reg_session { |
| 63 | /* Registry per domain. */ |
| 64 | union { |
| 65 | struct ust_registry_session *ust; |
| 66 | } reg; |
| 67 | |
| 68 | /* Contains buffer registry channel indexed by tracing channel key. */ |
| 69 | struct lttng_ht *channels; |
| 70 | }; |
| 71 | |
| 72 | /* |
| 73 | * Registry object for per UID buffers. |
| 74 | */ |
| 75 | struct buffer_reg_uid { |
| 76 | /* |
| 77 | * Keys to match this object in a hash table. The following three variables |
| 78 | * identify a unique per UID buffer registry. |
| 79 | */ |
| 80 | uint64_t session_id; /* Unique tracing session id. */ |
| 81 | int bits_per_long; /* ABI */ |
| 82 | uid_t uid; /* Owner. */ |
| 83 | |
| 84 | enum lttng_domain_type domain; |
| 85 | struct buffer_reg_session *registry; |
| 86 | |
| 87 | /* Indexed by session id. */ |
| 88 | struct lttng_ht_node_u64 node; |
| 89 | /* Node of a linked list used to teardown object at a destroy session. */ |
| 90 | struct cds_list_head lnode; |
| 91 | |
| 92 | char root_shm_path[PATH_MAX]; |
| 93 | char shm_path[PATH_MAX]; |
| 94 | }; |
| 95 | |
| 96 | /* |
| 97 | * Registry object for per PID buffers. |
| 98 | */ |
| 99 | struct buffer_reg_pid { |
| 100 | uint64_t session_id; |
| 101 | |
| 102 | struct buffer_reg_session *registry; |
| 103 | |
| 104 | /* Indexed by session id. */ |
| 105 | struct lttng_ht_node_u64 node; |
| 106 | |
| 107 | char root_shm_path[PATH_MAX]; |
| 108 | char shm_path[PATH_MAX]; |
| 109 | }; |
| 110 | |
| 111 | /* Buffer registry per UID. */ |
| 112 | void buffer_reg_init_uid_registry(void); |
| 113 | int buffer_reg_uid_create(uint64_t session_id, uint32_t bits_per_long, uid_t uid, |
| 114 | enum lttng_domain_type domain, struct buffer_reg_uid **regp, |
| 115 | const char *root_shm_path, const char *shm_path); |
| 116 | void buffer_reg_uid_add(struct buffer_reg_uid *reg); |
| 117 | struct buffer_reg_uid *buffer_reg_uid_find(uint64_t session_id, |
| 118 | uint32_t bits_per_long, uid_t uid); |
| 119 | void buffer_reg_uid_remove(struct buffer_reg_uid *regp); |
| 120 | void buffer_reg_uid_destroy(struct buffer_reg_uid *regp, |
| 121 | struct consumer_output *consumer); |
| 122 | |
| 123 | /* Buffer registry per PID. */ |
| 124 | void buffer_reg_init_pid_registry(void); |
| 125 | int buffer_reg_pid_create(uint64_t session_id, struct buffer_reg_pid **regp, |
| 126 | const char *root_shm_path, const char *shm_path); |
| 127 | void buffer_reg_pid_add(struct buffer_reg_pid *reg); |
| 128 | struct buffer_reg_pid *buffer_reg_pid_find(uint64_t session_id); |
| 129 | void buffer_reg_pid_remove(struct buffer_reg_pid *regp); |
| 130 | void buffer_reg_pid_destroy(struct buffer_reg_pid *regp); |
| 131 | |
| 132 | /* Channel */ |
| 133 | int buffer_reg_channel_create(uint64_t key, struct buffer_reg_channel **regp); |
| 134 | void buffer_reg_channel_add(struct buffer_reg_session *session, |
| 135 | struct buffer_reg_channel *channel); |
| 136 | struct buffer_reg_channel *buffer_reg_channel_find(uint64_t key, |
| 137 | struct buffer_reg_uid *reg); |
| 138 | void buffer_reg_channel_remove(struct buffer_reg_session *session, |
| 139 | struct buffer_reg_channel *regp); |
| 140 | void buffer_reg_channel_destroy(struct buffer_reg_channel *regp, |
| 141 | enum lttng_domain_type domain); |
| 142 | |
| 143 | /* Stream */ |
| 144 | int buffer_reg_stream_create(struct buffer_reg_stream **regp); |
| 145 | void buffer_reg_stream_add(struct buffer_reg_stream *stream, |
| 146 | struct buffer_reg_channel *channel); |
| 147 | void buffer_reg_stream_destroy(struct buffer_reg_stream *regp, |
| 148 | enum lttng_domain_type domain); |
| 149 | |
| 150 | /* Global registry. */ |
| 151 | void buffer_reg_destroy_registries(void); |
| 152 | |
| 153 | int buffer_reg_uid_consumer_channel_key( |
| 154 | struct cds_list_head *buffer_reg_uid_list, |
| 155 | uint64_t chan_key, uint64_t *consumer_chan_key); |
| 156 | |
| 157 | #endif /* LTTNG_BUFFER_REGISTRY_H */ |