Copy exclusion data in shadow_copy_event
[lttng-tools.git] / src / bin / lttng-sessiond / ust-registry.h
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_UST_REGISTRY_H
19 #define LTTNG_UST_REGISTRY_H
20
21 #include <pthread.h>
22 #include <stdint.h>
23
24 #include <common/hashtable/hashtable.h>
25 #include <common/compat/uuid.h>
26
27 #include "ust-ctl.h"
28
29 #define CTF_SPEC_MAJOR 1
30 #define CTF_SPEC_MINOR 8
31
32 struct ust_app;
33
34 struct ust_registry_session {
35 /*
36 * With multiple writers and readers, use this lock to access the registry.
37 * Can nest within the ust app session lock.
38 */
39 pthread_mutex_t 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];
46
47 /* session ABI description */
48
49 /* Size of long, in bits */
50 unsigned int bits_per_long;
51 /* Alignment, in bits */
52 unsigned int uint8_t_alignment,
53 uint16_t_alignment,
54 uint32_t_alignment,
55 uint64_t_alignment,
56 long_alignment;
57 /* endianness */
58 int byte_order; /* BIG_ENDIAN or LITTLE_ENDIAN */
59
60 /* Generated metadata. */
61 char *metadata; /* NOT null-terminated ! Use memcpy. */
62 size_t metadata_len, metadata_alloc_len;
63 /* Length of bytes sent to the consumer. */
64 size_t metadata_len_sent;
65 /*
66 * Hash table containing channels sent by the UST tracer. MUST be accessed
67 * with a RCU read side lock acquired.
68 */
69 struct lttng_ht *channels;
70 /* Unique key to identify the metadata on the consumer side. */
71 uint64_t metadata_key;
72 /*
73 * Indicates if the metadata is closed on the consumer side. This is to
74 * avoid double close of metadata when an application unregisters AND
75 * deletes its sessions.
76 */
77 unsigned int metadata_closed;
78 };
79
80 struct ust_registry_channel {
81 uint64_t key;
82 /* Id set when replying to a register channel. */
83 uint32_t chan_id;
84 enum ustctl_channel_header header_type;
85
86 /*
87 * Flag for this channel if the metadata was dumped once during
88 * registration. 0 means no, 1 yes.
89 */
90 unsigned int metadata_dumped;
91 /* Indicates if this channel registry has already been registered. */
92 unsigned int register_done;
93
94 /*
95 * Hash table containing events sent by the UST tracer. MUST be accessed
96 * with a RCU read side lock acquired.
97 */
98 struct lttng_ht *ht;
99 /* Next event ID available for a newly registered event. */
100 uint32_t next_event_id;
101 /* Once this value reaches UINT32_MAX, no more id can be allocated. */
102 uint32_t used_event_id;
103 /*
104 * Context fields of the registry. Context are per channel. Allocated by a
105 * register channel notification from the UST tracer.
106 */
107 size_t nr_ctx_fields;
108 struct ustctl_field *ctx_fields;
109 struct lttng_ht_node_u64 node;
110 /* For delayed reclaim */
111 struct rcu_head rcu_head;
112 };
113
114 /*
115 * Event registered from a UST tracer sent to the session daemon. This is
116 * indexed and matched by <event_name/signature>.
117 */
118 struct ust_registry_event {
119 int id;
120 /* Both objd are set by the tracer. */
121 int session_objd;
122 int channel_objd;
123 /* Name of the event returned by the tracer. */
124 char name[LTTNG_UST_SYM_NAME_LEN];
125 char *signature;
126 int loglevel;
127 size_t nr_fields;
128 struct ustctl_field *fields;
129 char *model_emf_uri;
130 /*
131 * Flag for this channel if the metadata was dumped once during
132 * registration. 0 means no, 1 yes.
133 */
134 unsigned int metadata_dumped;
135 /*
136 * Node in the ust-registry hash table. The event name is used to
137 * initialize the node and the event_name/signature for the match function.
138 */
139 struct lttng_ht_node_u64 node;
140 };
141
142 /*
143 * Validate that the id has reached the maximum allowed or not.
144 *
145 * Return 0 if NOT else 1.
146 */
147 static inline int ust_registry_is_max_id(uint32_t id)
148 {
149 return (id == UINT32_MAX) ? 1 : 0;
150 }
151
152 /*
153 * Return next available event id and increment the used counter. The
154 * ust_registry_is_max_id function MUST be called before in order to validate
155 * if the maximum number of IDs have been reached. If not, it is safe to call
156 * this function.
157 *
158 * Return a unique channel ID. If max is reached, the used_event_id counter is
159 * returned.
160 */
161 static inline uint32_t ust_registry_get_next_event_id(
162 struct ust_registry_channel *r)
163 {
164 if (ust_registry_is_max_id(r->used_event_id)) {
165 return r->used_event_id;
166 }
167
168 r->used_event_id++;
169 return r->next_event_id++;
170 }
171
172 /*
173 * Return next available channel id and increment the used counter. The
174 * ust_registry_is_max_id function MUST be called before in order to validate
175 * if the maximum number of IDs have been reached. If not, it is safe to call
176 * this function.
177 *
178 * Return a unique channel ID. If max is reached, the used_channel_id counter
179 * is returned.
180 */
181 static inline uint32_t ust_registry_get_next_chan_id(
182 struct ust_registry_session *r)
183 {
184 if (ust_registry_is_max_id(r->used_channel_id)) {
185 return r->used_channel_id;
186 }
187
188 r->used_channel_id++;
189 return r->next_channel_id++;
190 }
191
192 /*
193 * Return registry event count. This is read atomically.
194 */
195 static inline uint32_t ust_registry_get_event_count(
196 struct ust_registry_channel *r)
197 {
198 return (uint32_t) uatomic_read(&r->used_event_id);
199 }
200
201 #ifdef HAVE_LIBLTTNG_UST_CTL
202
203 void ust_registry_channel_destroy(struct ust_registry_session *session,
204 struct ust_registry_channel *chan);
205 struct ust_registry_channel *ust_registry_channel_find(
206 struct ust_registry_session *session, uint64_t key);
207 int ust_registry_channel_add(struct ust_registry_session *session,
208 uint64_t key);
209 void ust_registry_channel_del_free(struct ust_registry_session *session,
210 uint64_t key);
211
212 int ust_registry_session_init(struct ust_registry_session **sessionp,
213 struct ust_app *app,
214 uint32_t bits_per_long,
215 uint32_t uint8_t_alignment,
216 uint32_t uint16_t_alignment,
217 uint32_t uint32_t_alignment,
218 uint32_t uint64_t_alignment,
219 uint32_t long_alignment,
220 int byte_order,
221 uint32_t major,
222 uint32_t minor);
223 void ust_registry_session_destroy(struct ust_registry_session *session);
224
225 int ust_registry_create_event(struct ust_registry_session *session,
226 uint64_t chan_key, int session_objd, int channel_objd, char *name,
227 char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel,
228 char *model_emf_uri, int buffer_type, uint32_t *event_id_p,
229 struct ust_app *app);
230 struct ust_registry_event *ust_registry_find_event(
231 struct ust_registry_channel *chan, char *name, char *sig);
232 void ust_registry_destroy_event(struct ust_registry_channel *chan,
233 struct ust_registry_event *event);
234
235 /* app can be NULL for registry shared across applications. */
236 int ust_metadata_session_statedump(struct ust_registry_session *session,
237 struct ust_app *app, uint32_t major, uint32_t minor);
238 int ust_metadata_channel_statedump(struct ust_registry_session *session,
239 struct ust_registry_channel *chan);
240 int ust_metadata_event_statedump(struct ust_registry_session *session,
241 struct ust_registry_channel *chan,
242 struct ust_registry_event *event);
243
244 #else /* HAVE_LIBLTTNG_UST_CTL */
245
246 static inline
247 void ust_registry_channel_destroy(struct ust_registry_session *session,
248 struct ust_registry_channel *chan)
249 {}
250 static inline
251 struct ust_registry_channel *ust_registry_channel_find(
252 struct ust_registry_session *session, uint64_t key)
253 {
254 return NULL;
255 }
256 static inline
257 int ust_registry_channel_add(struct ust_registry_session *session,
258 uint64_t key)
259 {
260 return 0;
261 }
262 static inline
263 void ust_registry_channel_del_free(struct ust_registry_session *session,
264 uint64_t key)
265 {}
266 static inline
267 int ust_registry_session_init(struct ust_registry_session **sessionp,
268 struct ust_app *app,
269 uint32_t bits_per_long,
270 uint32_t uint8_t_alignment,
271 uint32_t uint16_t_alignment,
272 uint32_t uint32_t_alignment,
273 uint32_t uint64_t_alignment,
274 uint32_t long_alignment,
275 int byte_order)
276 {
277 return 0;
278 }
279 static inline
280 void ust_registry_session_destroy(struct ust_registry_session *session)
281 {}
282 static inline
283 int ust_registry_create_event(struct ust_registry_session *session,
284 uint64_t chan_key, int session_objd, int channel_objd, char *name,
285 char *sig, size_t nr_fields, struct ustctl_field *fields, int loglevel,
286 char *model_emf_uri, int buffer_type, uint32_t *event_id_p)
287 {
288 return 0;
289 }
290 static inline
291 struct ust_registry_event *ust_registry_find_event(
292 struct ust_registry_channel *chan, char *name, char *sig)
293 {
294 return NULL;
295 }
296 static inline
297 void ust_registry_destroy_event(struct ust_registry_channel *chan,
298 struct ust_registry_event *event)
299 {}
300
301 /* The app object can be NULL for registry shared across applications. */
302 static inline
303 int ust_metadata_session_statedump(struct ust_registry_session *session,
304 struct ust_app *app)
305 {
306 return 0;
307 }
308 static inline
309 int ust_metadata_channel_statedump(struct ust_registry_session *session,
310 struct ust_registry_channel *chan)
311 {
312 return 0;
313 }
314 static inline
315 int ust_metadata_event_statedump(struct ust_registry_session *session,
316 struct ust_registry_channel *chan,
317 struct ust_registry_event *event)
318 {
319 return 0;
320 }
321
322 #endif /* HAVE_LIBLTTNG_UST_CTL */
323
324 #endif /* LTTNG_UST_REGISTRY_H */
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