Commit | Line | Data |
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d0b96690 | 1 | /* |
ab5be9fa | 2 | * Copyright (C) 2013 David Goulet <dgoulet@efficios.com> |
d0b96690 | 3 | * |
ab5be9fa | 4 | * SPDX-License-Identifier: GPL-2.0-only |
d0b96690 | 5 | * |
d0b96690 DG |
6 | */ |
7 | ||
8 | #ifndef LTTNG_UST_REGISTRY_H | |
9 | #define LTTNG_UST_REGISTRY_H | |
10 | ||
11 | #include <pthread.h> | |
12 | #include <stdint.h> | |
d0b96690 DG |
13 | |
14 | #include <common/hashtable/hashtable.h> | |
c70636a7 | 15 | #include <common/uuid.h> |
d0b96690 | 16 | |
75018ab6 | 17 | #include "lttng-ust-ctl.h" |
7972aab2 | 18 | |
d0b96690 DG |
19 | #define CTF_SPEC_MAJOR 1 |
20 | #define CTF_SPEC_MINOR 8 | |
21 | ||
22 | struct ust_app; | |
23 | ||
24 | struct ust_registry_session { | |
25 | /* | |
dc2bbdae MD |
26 | * With multiple writers and readers, use this lock to access |
27 | * the registry. Can nest within the ust app session lock. | |
28 | * Also acts as a registry serialization lock. Used by registry | |
29 | * readers to serialize the registry information sent from the | |
30 | * sessiond to the consumerd. | |
31 | * The consumer socket lock nests within this lock. | |
d0b96690 DG |
32 | */ |
33 | pthread_mutex_t lock; | |
34 | /* Next channel ID available for a newly registered channel. */ | |
35 | uint32_t next_channel_id; | |
36 | /* Once this value reaches UINT32_MAX, no more id can be allocated. */ | |
37 | uint32_t used_channel_id; | |
10b56aef MD |
38 | /* Next enumeration ID available. */ |
39 | uint64_t next_enum_id; | |
d0b96690 | 40 | /* Universal unique identifier used by the tracer. */ |
c70636a7 | 41 | unsigned char uuid[LTTNG_UUID_LEN]; |
d0b96690 DG |
42 | |
43 | /* session ABI description */ | |
44 | ||
45 | /* Size of long, in bits */ | |
46 | unsigned int bits_per_long; | |
47 | /* Alignment, in bits */ | |
48 | unsigned int uint8_t_alignment, | |
49 | uint16_t_alignment, | |
50 | uint32_t_alignment, | |
51 | uint64_t_alignment, | |
52 | long_alignment; | |
53 | /* endianness */ | |
54 | int byte_order; /* BIG_ENDIAN or LITTLE_ENDIAN */ | |
55 | ||
56 | /* Generated metadata. */ | |
57 | char *metadata; /* NOT null-terminated ! Use memcpy. */ | |
58 | size_t metadata_len, metadata_alloc_len; | |
d88aee68 DG |
59 | /* Length of bytes sent to the consumer. */ |
60 | size_t metadata_len_sent; | |
93ec662e JD |
61 | /* Current version of the metadata. */ |
62 | uint64_t metadata_version; | |
d7ba1388 | 63 | |
9aed4377 JG |
64 | /* |
65 | * Those fields are only used when a session is created with | |
66 | * the --shm-path option. In this case, the metadata is output | |
67 | * twice: once to the consumer, as ususal, but a second time | |
68 | * also in the shm path directly. This is done so that a copy | |
69 | * of the metadata that is as fresh as possible is available | |
70 | * on the event of a crash. | |
71 | * | |
72 | * root_shm_path contains the shm-path provided by the user, along with | |
73 | * the session's name and timestamp: | |
74 | * e.g. /tmp/my_shm/my_session-20180612-135822 | |
75 | * | |
76 | * shm_path contains the full path of the memory buffers: | |
77 | * e.g. /tmp/my_shm/my_session-20180612-135822/ust/uid/1000/64-bit | |
78 | * | |
79 | * metadata_path contains the full path to the metadata file that | |
80 | * is kept for the "crash buffer" extraction: | |
81 | * e.g. /tmp/my_shm/my_session-20180612-135822/ust/uid/1000/64-bit/metadata | |
82 | * | |
83 | * Note that this is not the trace's final metadata file. It is | |
84 | * only meant to be used to read the contents of the ring buffers | |
85 | * in the event of a crash. | |
86 | * | |
87 | * metadata_fd is a file descriptor that points to the file at | |
88 | * 'metadata_path'. | |
89 | */ | |
3d071855 | 90 | char root_shm_path[PATH_MAX]; |
d7ba1388 MD |
91 | char shm_path[PATH_MAX]; |
92 | char metadata_path[PATH_MAX]; | |
93 | int metadata_fd; /* file-backed metadata FD */ | |
94 | ||
45893984 | 95 | /* |
dc2bbdae MD |
96 | * Hash table containing channels sent by the UST tracer. MUST |
97 | * be accessed with a RCU read side lock acquired. | |
45893984 DG |
98 | */ |
99 | struct lttng_ht *channels; | |
dc2bbdae MD |
100 | /* |
101 | * Unique key to identify the metadata on the consumer side. | |
102 | */ | |
7972aab2 DG |
103 | uint64_t metadata_key; |
104 | /* | |
105 | * Indicates if the metadata is closed on the consumer side. This is to | |
106 | * avoid double close of metadata when an application unregisters AND | |
107 | * deletes its sessions. | |
108 | */ | |
109 | unsigned int metadata_closed; | |
4628484a MD |
110 | |
111 | /* User and group owning the session. */ | |
112 | uid_t uid; | |
113 | gid_t gid; | |
10b56aef MD |
114 | |
115 | /* Enumerations table. */ | |
116 | struct lttng_ht *enums; | |
7062f070 JD |
117 | |
118 | /* | |
119 | * Copy of the tracer version when the first app is registered. | |
120 | * It is used if we need to regenerate the metadata. | |
121 | */ | |
122 | uint32_t major; | |
123 | uint32_t minor; | |
8de88061 JR |
124 | |
125 | /* The id of the parent session */ | |
126 | uint64_t tracing_id; | |
127 | uid_t tracing_uid; | |
d0b96690 DG |
128 | }; |
129 | ||
130 | struct ust_registry_channel { | |
45893984 | 131 | uint64_t key; |
e9404c27 | 132 | uint64_t consumer_key; |
d0b96690 DG |
133 | /* Id set when replying to a register channel. */ |
134 | uint32_t chan_id; | |
b623cb6a | 135 | enum lttng_ust_ctl_channel_header header_type; |
d0b96690 | 136 | |
7972aab2 DG |
137 | /* |
138 | * Flag for this channel if the metadata was dumped once during | |
139 | * registration. 0 means no, 1 yes. | |
140 | */ | |
141 | unsigned int metadata_dumped; | |
142 | /* Indicates if this channel registry has already been registered. */ | |
143 | unsigned int register_done; | |
144 | ||
d0b96690 DG |
145 | /* |
146 | * Hash table containing events sent by the UST tracer. MUST be accessed | |
147 | * with a RCU read side lock acquired. | |
148 | */ | |
149 | struct lttng_ht *ht; | |
150 | /* Next event ID available for a newly registered event. */ | |
151 | uint32_t next_event_id; | |
152 | /* Once this value reaches UINT32_MAX, no more id can be allocated. */ | |
153 | uint32_t used_event_id; | |
154 | /* | |
155 | * Context fields of the registry. Context are per channel. Allocated by a | |
156 | * register channel notification from the UST tracer. | |
157 | */ | |
158 | size_t nr_ctx_fields; | |
b623cb6a | 159 | struct lttng_ust_ctl_field *ctx_fields; |
45893984 | 160 | struct lttng_ht_node_u64 node; |
36b588ed MD |
161 | /* For delayed reclaim */ |
162 | struct rcu_head rcu_head; | |
d0b96690 DG |
163 | }; |
164 | ||
165 | /* | |
166 | * Event registered from a UST tracer sent to the session daemon. This is | |
167 | * indexed and matched by <event_name/signature>. | |
168 | */ | |
169 | struct ust_registry_event { | |
170 | int id; | |
171 | /* Both objd are set by the tracer. */ | |
172 | int session_objd; | |
173 | int channel_objd; | |
174 | /* Name of the event returned by the tracer. */ | |
fc4b93fa | 175 | char name[LTTNG_UST_ABI_SYM_NAME_LEN]; |
d0b96690 | 176 | char *signature; |
2106efa0 | 177 | int loglevel_value; |
d0b96690 | 178 | size_t nr_fields; |
b623cb6a | 179 | struct lttng_ust_ctl_field *fields; |
d0b96690 | 180 | char *model_emf_uri; |
7972aab2 DG |
181 | /* |
182 | * Flag for this channel if the metadata was dumped once during | |
183 | * registration. 0 means no, 1 yes. | |
184 | */ | |
185 | unsigned int metadata_dumped; | |
d0b96690 DG |
186 | /* |
187 | * Node in the ust-registry hash table. The event name is used to | |
188 | * initialize the node and the event_name/signature for the match function. | |
189 | */ | |
7972aab2 | 190 | struct lttng_ht_node_u64 node; |
d0b96690 DG |
191 | }; |
192 | ||
10b56aef | 193 | struct ust_registry_enum { |
fc4b93fa | 194 | char name[LTTNG_UST_ABI_SYM_NAME_LEN]; |
b623cb6a | 195 | struct lttng_ust_ctl_enum_entry *entries; |
10b56aef MD |
196 | size_t nr_entries; |
197 | uint64_t id; /* enum id in session */ | |
198 | /* Enumeration node in session hash table. */ | |
199 | struct lttng_ht_node_str node; | |
200 | /* For delayed reclaim. */ | |
201 | struct rcu_head rcu_head; | |
202 | }; | |
203 | ||
d0b96690 DG |
204 | /* |
205 | * Validate that the id has reached the maximum allowed or not. | |
206 | * | |
207 | * Return 0 if NOT else 1. | |
208 | */ | |
209 | static inline int ust_registry_is_max_id(uint32_t id) | |
210 | { | |
211 | return (id == UINT32_MAX) ? 1 : 0; | |
212 | } | |
213 | ||
214 | /* | |
215 | * Return next available event id and increment the used counter. The | |
216 | * ust_registry_is_max_id function MUST be called before in order to validate | |
217 | * if the maximum number of IDs have been reached. If not, it is safe to call | |
218 | * this function. | |
219 | * | |
220 | * Return a unique channel ID. If max is reached, the used_event_id counter is | |
221 | * returned. | |
222 | */ | |
223 | static inline uint32_t ust_registry_get_next_event_id( | |
224 | struct ust_registry_channel *r) | |
225 | { | |
226 | if (ust_registry_is_max_id(r->used_event_id)) { | |
227 | return r->used_event_id; | |
228 | } | |
229 | ||
230 | r->used_event_id++; | |
231 | return r->next_event_id++; | |
232 | } | |
233 | ||
234 | /* | |
235 | * Return next available channel id and increment the used counter. The | |
236 | * ust_registry_is_max_id function MUST be called before in order to validate | |
237 | * if the maximum number of IDs have been reached. If not, it is safe to call | |
238 | * this function. | |
239 | * | |
240 | * Return a unique channel ID. If max is reached, the used_channel_id counter | |
241 | * is returned. | |
242 | */ | |
243 | static inline uint32_t ust_registry_get_next_chan_id( | |
244 | struct ust_registry_session *r) | |
245 | { | |
246 | if (ust_registry_is_max_id(r->used_channel_id)) { | |
247 | return r->used_channel_id; | |
248 | } | |
249 | ||
250 | r->used_channel_id++; | |
251 | return r->next_channel_id++; | |
252 | } | |
253 | ||
254 | /* | |
255 | * Return registry event count. This is read atomically. | |
256 | */ | |
257 | static inline uint32_t ust_registry_get_event_count( | |
258 | struct ust_registry_channel *r) | |
259 | { | |
260 | return (uint32_t) uatomic_read(&r->used_event_id); | |
261 | } | |
262 | ||
7972aab2 DG |
263 | #ifdef HAVE_LIBLTTNG_UST_CTL |
264 | ||
d0b96690 DG |
265 | void ust_registry_channel_destroy(struct ust_registry_session *session, |
266 | struct ust_registry_channel *chan); | |
45893984 DG |
267 | struct ust_registry_channel *ust_registry_channel_find( |
268 | struct ust_registry_session *session, uint64_t key); | |
269 | int ust_registry_channel_add(struct ust_registry_session *session, | |
270 | uint64_t key); | |
271 | void ust_registry_channel_del_free(struct ust_registry_session *session, | |
e9404c27 | 272 | uint64_t key, bool notif); |
45893984 DG |
273 | |
274 | int ust_registry_session_init(struct ust_registry_session **sessionp, | |
d0b96690 DG |
275 | struct ust_app *app, |
276 | uint32_t bits_per_long, | |
277 | uint32_t uint8_t_alignment, | |
278 | uint32_t uint16_t_alignment, | |
279 | uint32_t uint32_t_alignment, | |
280 | uint32_t uint64_t_alignment, | |
281 | uint32_t long_alignment, | |
af6142cf MD |
282 | int byte_order, |
283 | uint32_t major, | |
d7ba1388 | 284 | uint32_t minor, |
3d071855 | 285 | const char *root_shm_path, |
d7ba1388 MD |
286 | const char *shm_path, |
287 | uid_t euid, | |
8de88061 JR |
288 | gid_t egid, |
289 | uint64_t tracing_id, | |
290 | uid_t tracing_uid); | |
d0b96690 DG |
291 | void ust_registry_session_destroy(struct ust_registry_session *session); |
292 | ||
293 | int ust_registry_create_event(struct ust_registry_session *session, | |
45893984 | 294 | uint64_t chan_key, int session_objd, int channel_objd, char *name, |
b623cb6a | 295 | char *sig, size_t nr_fields, struct lttng_ust_ctl_field *fields, |
2106efa0 PP |
296 | int loglevel_value, char *model_emf_uri, int buffer_type, |
297 | uint32_t *event_id_p, struct ust_app *app); | |
d0b96690 DG |
298 | struct ust_registry_event *ust_registry_find_event( |
299 | struct ust_registry_channel *chan, char *name, char *sig); | |
300 | void ust_registry_destroy_event(struct ust_registry_channel *chan, | |
301 | struct ust_registry_event *event); | |
302 | ||
303 | /* app can be NULL for registry shared across applications. */ | |
304 | int ust_metadata_session_statedump(struct ust_registry_session *session, | |
af6142cf | 305 | struct ust_app *app, uint32_t major, uint32_t minor); |
d0b96690 DG |
306 | int ust_metadata_channel_statedump(struct ust_registry_session *session, |
307 | struct ust_registry_channel *chan); | |
308 | int ust_metadata_event_statedump(struct ust_registry_session *session, | |
309 | struct ust_registry_channel *chan, | |
310 | struct ust_registry_event *event); | |
10b56aef MD |
311 | int ust_registry_create_or_find_enum(struct ust_registry_session *session, |
312 | int session_objd, char *name, | |
b623cb6a | 313 | struct lttng_ust_ctl_enum_entry *entries, size_t nr_entries, |
10b56aef MD |
314 | uint64_t *enum_id); |
315 | struct ust_registry_enum * | |
316 | ust_registry_lookup_enum_by_id(struct ust_registry_session *session, | |
317 | const char *name, uint64_t id); | |
d0b96690 | 318 | |
7972aab2 DG |
319 | #else /* HAVE_LIBLTTNG_UST_CTL */ |
320 | ||
321 | static inline | |
322 | void ust_registry_channel_destroy(struct ust_registry_session *session, | |
323 | struct ust_registry_channel *chan) | |
324 | {} | |
325 | static inline | |
326 | struct ust_registry_channel *ust_registry_channel_find( | |
327 | struct ust_registry_session *session, uint64_t key) | |
328 | { | |
329 | return NULL; | |
330 | } | |
331 | static inline | |
332 | int ust_registry_channel_add(struct ust_registry_session *session, | |
333 | uint64_t key) | |
334 | { | |
335 | return 0; | |
336 | } | |
337 | static inline | |
338 | void ust_registry_channel_del_free(struct ust_registry_session *session, | |
e9404c27 | 339 | uint64_t key, bool notif) |
7972aab2 DG |
340 | {} |
341 | static inline | |
342 | int ust_registry_session_init(struct ust_registry_session **sessionp, | |
343 | struct ust_app *app, | |
344 | uint32_t bits_per_long, | |
345 | uint32_t uint8_t_alignment, | |
346 | uint32_t uint16_t_alignment, | |
347 | uint32_t uint32_t_alignment, | |
348 | uint32_t uint64_t_alignment, | |
349 | uint32_t long_alignment, | |
8de88061 JR |
350 | int byte_order, |
351 | uint32_t major, | |
352 | uint32_t minor, | |
353 | const char *root_shm_path, | |
354 | const char *shm_path, | |
355 | uid_t euid, | |
356 | gid_t egid, | |
357 | uint64_t tracing_id, | |
16ea9370 | 358 | uid_t tracing_uid) |
7972aab2 DG |
359 | { |
360 | return 0; | |
361 | } | |
362 | static inline | |
363 | void ust_registry_session_destroy(struct ust_registry_session *session) | |
364 | {} | |
365 | static inline | |
366 | int ust_registry_create_event(struct ust_registry_session *session, | |
367 | uint64_t chan_key, int session_objd, int channel_objd, char *name, | |
b623cb6a | 368 | char *sig, size_t nr_fields, struct lttng_ust_ctl_field *fields, |
2106efa0 PP |
369 | int loglevel_value, char *model_emf_uri, int buffer_type, |
370 | uint32_t *event_id_p) | |
7972aab2 DG |
371 | { |
372 | return 0; | |
373 | } | |
374 | static inline | |
375 | struct ust_registry_event *ust_registry_find_event( | |
376 | struct ust_registry_channel *chan, char *name, char *sig) | |
377 | { | |
378 | return NULL; | |
379 | } | |
380 | static inline | |
381 | void ust_registry_destroy_event(struct ust_registry_channel *chan, | |
382 | struct ust_registry_event *event) | |
383 | {} | |
384 | ||
385 | /* The app object can be NULL for registry shared across applications. */ | |
386 | static inline | |
387 | int ust_metadata_session_statedump(struct ust_registry_session *session, | |
9804676e | 388 | struct ust_app *app, uint32_t major, uint32_t minor) |
7972aab2 DG |
389 | { |
390 | return 0; | |
391 | } | |
392 | static inline | |
393 | int ust_metadata_channel_statedump(struct ust_registry_session *session, | |
394 | struct ust_registry_channel *chan) | |
395 | { | |
396 | return 0; | |
397 | } | |
398 | static inline | |
399 | int ust_metadata_event_statedump(struct ust_registry_session *session, | |
400 | struct ust_registry_channel *chan, | |
401 | struct ust_registry_event *event) | |
402 | { | |
403 | return 0; | |
404 | } | |
10b56aef MD |
405 | static inline |
406 | int ust_registry_create_or_find_enum(struct ust_registry_session *session, | |
407 | int session_objd, char *name, | |
b623cb6a | 408 | struct lttng_ust_ctl_enum_entry *entries, size_t nr_entries, |
10b56aef MD |
409 | uint64_t *enum_id) |
410 | { | |
411 | return 0; | |
412 | } | |
413 | static inline | |
414 | struct ust_registry_enum * | |
415 | ust_registry_lookup_enum_by_id(struct ust_registry_session *session, | |
416 | const char *name, uint64_t id) | |
417 | { | |
418 | return NULL; | |
419 | } | |
7972aab2 DG |
420 | |
421 | #endif /* HAVE_LIBLTTNG_UST_CTL */ | |
422 | ||
d0b96690 | 423 | #endif /* LTTNG_UST_REGISTRY_H */ |