2 * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
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.
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
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.
18 #ifndef LTTNG_UST_REGISTRY_H
19 #define LTTNG_UST_REGISTRY_H
23 #include <lttng/ust-ctl.h>
25 #include <common/hashtable/hashtable.h>
26 #include <common/compat/uuid.h>
28 #define CTF_SPEC_MAJOR 1
29 #define CTF_SPEC_MINOR 8
33 struct ust_registry_session
{
35 * With multiple writers and readers, use this lock to access
36 * the registry. Use defined macros above to lock it.
37 * Can nest within the ust app session lock.
40 /* Next channel ID available for a newly registered channel. */
41 uint32_t next_channel_id
;
42 /* Once this value reaches UINT32_MAX, no more id can be allocated. */
43 uint32_t used_channel_id
;
44 /* Universal unique identifier used by the tracer. */
45 unsigned char uuid
[UUID_LEN
];
47 /* session ABI description */
49 /* Size of long, in bits */
50 unsigned int bits_per_long
;
51 /* Alignment, in bits */
52 unsigned int uint8_t_alignment
,
58 int byte_order
; /* BIG_ENDIAN or LITTLE_ENDIAN */
60 /* Generated metadata. */
61 char *metadata
; /* NOT null-terminated ! Use memcpy. */
62 size_t metadata_len
, metadata_alloc_len
;
65 struct ust_registry_channel
{
66 /* Id set when replying to a register channel. */
68 enum ustctl_channel_header header_type
;
71 * Hash table containing events sent by the UST tracer. MUST be accessed
72 * with a RCU read side lock acquired.
75 /* Next event ID available for a newly registered event. */
76 uint32_t next_event_id
;
77 /* Once this value reaches UINT32_MAX, no more id can be allocated. */
78 uint32_t used_event_id
;
80 * Context fields of the registry. Context are per channel. Allocated by a
81 * register channel notification from the UST tracer.
84 struct ustctl_field
*ctx_fields
;
88 * Event registered from a UST tracer sent to the session daemon. This is
89 * indexed and matched by <event_name/signature>.
91 struct ust_registry_event
{
93 /* Both objd are set by the tracer. */
96 /* Name of the event returned by the tracer. */
97 char name
[LTTNG_UST_SYM_NAME_LEN
];
101 struct ustctl_field
*fields
;
104 * Node in the ust-registry hash table. The event name is used to
105 * initialize the node and the event_name/signature for the match function.
107 struct lttng_ht_node_str node
;
111 * Validate that the id has reached the maximum allowed or not.
113 * Return 0 if NOT else 1.
115 static inline int ust_registry_is_max_id(uint32_t id
)
117 return (id
== UINT32_MAX
) ? 1 : 0;
121 * Return next available event id and increment the used counter. The
122 * ust_registry_is_max_id function MUST be called before in order to validate
123 * if the maximum number of IDs have been reached. If not, it is safe to call
126 * Return a unique channel ID. If max is reached, the used_event_id counter is
129 static inline uint32_t ust_registry_get_next_event_id(
130 struct ust_registry_channel
*r
)
132 if (ust_registry_is_max_id(r
->used_event_id
)) {
133 return r
->used_event_id
;
137 return r
->next_event_id
++;
141 * Return next available channel id and increment the used counter. The
142 * ust_registry_is_max_id function MUST be called before in order to validate
143 * if the maximum number of IDs have been reached. If not, it is safe to call
146 * Return a unique channel ID. If max is reached, the used_channel_id counter
149 static inline uint32_t ust_registry_get_next_chan_id(
150 struct ust_registry_session
*r
)
152 if (ust_registry_is_max_id(r
->used_channel_id
)) {
153 return r
->used_channel_id
;
156 r
->used_channel_id
++;
157 return r
->next_channel_id
++;
161 * Return registry event count. This is read atomically.
163 static inline uint32_t ust_registry_get_event_count(
164 struct ust_registry_channel
*r
)
166 return (uint32_t) uatomic_read(&r
->used_event_id
);
169 void ust_registry_channel_init(struct ust_registry_session
*session
,
170 struct ust_registry_channel
*chan
);
171 void ust_registry_channel_destroy(struct ust_registry_session
*session
,
172 struct ust_registry_channel
*chan
);
174 int ust_registry_session_init(struct ust_registry_session
*session
,
176 uint32_t bits_per_long
,
177 uint32_t uint8_t_alignment
,
178 uint32_t uint16_t_alignment
,
179 uint32_t uint32_t_alignment
,
180 uint32_t uint64_t_alignment
,
181 uint32_t long_alignment
,
184 void ust_registry_session_destroy(struct ust_registry_session
*session
);
186 int ust_registry_create_event(struct ust_registry_session
*session
,
187 struct ust_registry_channel
*channel
,
188 int session_objd
, int channel_objd
, char *name
, char *sig
,
189 size_t nr_fields
, struct ustctl_field
*fields
, int loglevel
,
190 char *model_emf_uri
, uint32_t *event_id
);
191 struct ust_registry_event
*ust_registry_find_event(
192 struct ust_registry_channel
*chan
, char *name
, char *sig
);
193 void ust_registry_destroy_event(struct ust_registry_channel
*chan
,
194 struct ust_registry_event
*event
);
196 /* app can be NULL for registry shared across applications. */
197 int ust_metadata_session_statedump(struct ust_registry_session
*session
,
198 struct ust_app
*app
);
199 int ust_metadata_channel_statedump(struct ust_registry_session
*session
,
200 struct ust_registry_channel
*chan
);
201 int ust_metadata_event_statedump(struct ust_registry_session
*session
,
202 struct ust_registry_channel
*chan
,
203 struct ust_registry_event
*event
);
205 #endif /* LTTNG_UST_REGISTRY_H */