Commit | Line | Data |
---|---|---|
8020ceb5 | 1 | /* |
7dd08bec | 2 | * lttng-events.c |
8020ceb5 | 3 | * |
8020ceb5 MD |
4 | * Holds LTTng per-session event registry. |
5 | * | |
e92f3e28 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
8020ceb5 MD |
21 | */ |
22 | ||
b5234c06 MD |
23 | #define _GNU_SOURCE |
24 | #include <stdio.h> | |
25 | #include <urcu/list.h> | |
8165c8da | 26 | #include <urcu/hlist.h> |
b5234c06 | 27 | #include <pthread.h> |
b5234c06 | 28 | #include <errno.h> |
f4681817 MD |
29 | #include <sys/shm.h> |
30 | #include <sys/ipc.h> | |
44c72f10 MD |
31 | #include <stdint.h> |
32 | #include <stddef.h> | |
28b12049 MD |
33 | #include <inttypes.h> |
34 | #include <time.h> | |
2ae57758 | 35 | #include <lttng/ust-endian.h> |
28b12049 | 36 | #include "clock.h" |
44c72f10 MD |
37 | |
38 | #include <urcu-bp.h> | |
39 | #include <urcu/compiler.h> | |
40 | #include <urcu/uatomic.h> | |
41 | #include <urcu/arch.h> | |
42 | ||
43 | #include <lttng/tracepoint.h> | |
4318ae1b | 44 | #include <lttng/ust-events.h> |
44c72f10 MD |
45 | |
46 | #include <usterr-signal-safe.h> | |
47 | #include <helper.h> | |
7d3e35b6 | 48 | #include <lttng/ust-ctl.h> |
32ce8569 | 49 | #include <ust-comm.h> |
53569322 MD |
50 | #include <lttng/ust-dynamic-type.h> |
51 | #include <lttng/ust-context-provider.h> | |
1f18504e | 52 | #include "error.h" |
08114193 | 53 | #include "compat.h" |
eda498b8 | 54 | #include "lttng-ust-uuid.h" |
44c72f10 | 55 | |
457a6b58 | 56 | #include "tracepoint-internal.h" |
7dd08bec MD |
57 | #include "lttng-tracer.h" |
58 | #include "lttng-tracer-core.h" | |
cf73e0fe | 59 | #include "lttng-ust-statedump.h" |
b728d87e | 60 | #include "wait.h" |
8d8a24c8 | 61 | #include "../libringbuffer/shm.h" |
596c4223 | 62 | #include "jhash.h" |
8165c8da MD |
63 | |
64 | /* | |
3327ac33 MD |
65 | * All operations within this file are called by the communication |
66 | * thread, under ust_lock protection. | |
8165c8da | 67 | */ |
8165c8da | 68 | |
b5234c06 | 69 | static CDS_LIST_HEAD(sessions); |
8165c8da | 70 | |
37dddb65 MD |
71 | struct cds_list_head *_lttng_get_sessions(void) |
72 | { | |
73 | return &sessions; | |
74 | } | |
75 | ||
7dd08bec | 76 | static void _lttng_event_destroy(struct lttng_event *event); |
c785c634 | 77 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 78 | |
e58095ef MD |
79 | static |
80 | void lttng_session_lazy_sync_enablers(struct lttng_session *session); | |
81 | static | |
82 | void lttng_session_sync_enablers(struct lttng_session *session); | |
83 | static | |
84 | void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
85 | ||
6715d7d1 MD |
86 | /* |
87 | * Called with ust lock held. | |
88 | */ | |
89 | int lttng_session_active(void) | |
90 | { | |
91 | struct lttng_session *iter; | |
92 | ||
93 | cds_list_for_each_entry(iter, &sessions, node) { | |
94 | if (iter->active) | |
95 | return 1; | |
96 | } | |
97 | return 0; | |
98 | } | |
99 | ||
e58095ef MD |
100 | static |
101 | int lttng_loglevel_match(int loglevel, | |
102 | unsigned int has_loglevel, | |
457a6b58 MD |
103 | enum lttng_ust_loglevel_type req_type, |
104 | int req_loglevel) | |
105 | { | |
e58095ef MD |
106 | if (!has_loglevel) |
107 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
108 | switch (req_type) { |
109 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 110 | if (loglevel <= req_loglevel |
67ada458 | 111 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
112 | return 1; |
113 | else | |
114 | return 0; | |
115 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 116 | if (loglevel == req_loglevel |
67ada458 | 117 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
118 | return 1; |
119 | else | |
120 | return 0; | |
121 | case LTTNG_UST_LOGLEVEL_ALL: | |
122 | default: | |
67ada458 | 123 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
124 | return 1; |
125 | else | |
126 | return 0; | |
457a6b58 MD |
127 | } |
128 | } | |
129 | ||
8020ceb5 MD |
130 | void synchronize_trace(void) |
131 | { | |
8020ceb5 | 132 | synchronize_rcu(); |
8020ceb5 MD |
133 | } |
134 | ||
7dd08bec | 135 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 136 | { |
7dd08bec | 137 | struct lttng_session *session; |
74d81a6c | 138 | int i; |
8020ceb5 | 139 | |
7dd08bec | 140 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
141 | if (!session) |
142 | return NULL; | |
53569322 MD |
143 | if (lttng_session_context_init(&session->ctx)) { |
144 | free(session); | |
145 | return NULL; | |
146 | } | |
e58095ef MD |
147 | CDS_INIT_LIST_HEAD(&session->chan_head); |
148 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 149 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 150 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
151 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
152 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
153 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
154 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 155 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
156 | return session; |
157 | } | |
158 | ||
74d81a6c MD |
159 | /* |
160 | * Only used internally at session destruction. | |
161 | */ | |
162 | static | |
163 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
164 | { | |
165 | struct channel *chan; | |
166 | struct lttng_ust_shm_handle *handle; | |
167 | ||
168 | cds_list_del(<tng_chan->node); | |
169 | lttng_destroy_context(lttng_chan->ctx); | |
170 | chan = lttng_chan->chan; | |
171 | handle = lttng_chan->handle; | |
172 | /* | |
173 | * note: lttng_chan is private data contained within handle. It | |
174 | * will be freed along with the handle. | |
175 | */ | |
176 | channel_destroy(chan, handle, 0); | |
177 | } | |
178 | ||
ac6b4ac6 MD |
179 | static |
180 | void register_event(struct lttng_event *event) | |
181 | { | |
182 | int ret; | |
183 | const struct lttng_event_desc *desc; | |
184 | ||
185 | assert(event->registered == 0); | |
186 | desc = event->desc; | |
b553ed99 | 187 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
188 | desc->probe_callback, |
189 | event, desc->signature); | |
190 | WARN_ON_ONCE(ret); | |
191 | if (!ret) | |
192 | event->registered = 1; | |
193 | } | |
194 | ||
195 | static | |
196 | void unregister_event(struct lttng_event *event) | |
197 | { | |
198 | int ret; | |
199 | const struct lttng_event_desc *desc; | |
200 | ||
201 | assert(event->registered == 1); | |
202 | desc = event->desc; | |
b553ed99 | 203 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
204 | desc->probe_callback, |
205 | event); | |
206 | WARN_ON_ONCE(ret); | |
207 | if (!ret) | |
208 | event->registered = 0; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Only used internally at session destruction. | |
213 | */ | |
214 | static | |
215 | void _lttng_event_unregister(struct lttng_event *event) | |
216 | { | |
217 | if (event->registered) | |
218 | unregister_event(event); | |
219 | } | |
220 | ||
7dd08bec | 221 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 222 | { |
7dd08bec MD |
223 | struct lttng_channel *chan, *tmpchan; |
224 | struct lttng_event *event, *tmpevent; | |
c785c634 | 225 | struct lttng_enum *_enum, *tmp_enum; |
e58095ef | 226 | struct lttng_enabler *enabler, *tmpenabler; |
8020ceb5 | 227 | |
b5234c06 | 228 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 229 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 230 | _lttng_event_unregister(event); |
8020ceb5 MD |
231 | } |
232 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
b553ed99 | 233 | __tracepoint_probe_prune_release_queue(); |
e58095ef MD |
234 | cds_list_for_each_entry_safe(enabler, tmpenabler, |
235 | &session->enablers_head, node) | |
236 | lttng_enabler_destroy(enabler); | |
237 | cds_list_for_each_entry_safe(event, tmpevent, | |
238 | &session->events_head, node) | |
7dd08bec | 239 | _lttng_event_destroy(event); |
c785c634 MD |
240 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
241 | &session->enums_head, node) | |
242 | _lttng_enum_destroy(_enum); | |
e58095ef | 243 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 244 | _lttng_channel_unmap(chan); |
e58095ef | 245 | cds_list_del(&session->node); |
53569322 | 246 | lttng_destroy_context(session->ctx); |
b5234c06 | 247 | free(session); |
8020ceb5 MD |
248 | } |
249 | ||
53569322 MD |
250 | static |
251 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
252 | struct lttng_session *session) | |
253 | { | |
254 | const char *enum_name = desc->name; | |
255 | struct lttng_enum *_enum; | |
256 | struct cds_hlist_head *head; | |
257 | struct cds_hlist_node *node; | |
258 | int ret = 0; | |
259 | size_t name_len = strlen(enum_name); | |
260 | uint32_t hash; | |
261 | int notify_socket; | |
262 | ||
263 | hash = jhash(enum_name, name_len, 0); | |
264 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
265 | cds_hlist_for_each_entry(_enum, node, head, hlist) { | |
266 | assert(_enum->desc); | |
267 | if (!strncmp(_enum->desc->name, desc->name, | |
268 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
269 | ret = -EEXIST; | |
270 | goto exist; | |
271 | } | |
272 | } | |
273 | ||
274 | notify_socket = lttng_get_notify_socket(session->owner); | |
275 | if (notify_socket < 0) { | |
276 | ret = notify_socket; | |
277 | goto socket_error; | |
278 | } | |
279 | ||
280 | _enum = zmalloc(sizeof(*_enum)); | |
281 | if (!_enum) { | |
282 | ret = -ENOMEM; | |
283 | goto cache_error; | |
284 | } | |
285 | _enum->session = session; | |
286 | _enum->desc = desc; | |
287 | ||
288 | ret = ustcomm_register_enum(notify_socket, | |
289 | session->objd, | |
290 | enum_name, | |
291 | desc->nr_entries, | |
292 | desc->entries, | |
293 | &_enum->id); | |
294 | if (ret < 0) { | |
295 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
296 | goto sessiond_register_error; | |
297 | } | |
298 | cds_list_add(&_enum->node, &session->enums_head); | |
299 | cds_hlist_add_head(&_enum->hlist, head); | |
300 | return 0; | |
301 | ||
302 | sessiond_register_error: | |
303 | free(_enum); | |
304 | cache_error: | |
305 | socket_error: | |
306 | exist: | |
307 | return ret; | |
308 | } | |
309 | ||
310 | static | |
311 | int lttng_create_enum_check(const struct lttng_type *type, | |
312 | struct lttng_session *session) | |
313 | { | |
314 | switch (type->atype) { | |
315 | case atype_enum: | |
316 | { | |
317 | const struct lttng_enum_desc *enum_desc; | |
318 | int ret; | |
319 | ||
320 | enum_desc = type->u.basic.enumeration.desc; | |
321 | ret = lttng_enum_create(enum_desc, session); | |
322 | if (ret && ret != -EEXIST) { | |
323 | DBG("Unable to create enum error: (%d)", ret); | |
324 | return ret; | |
325 | } | |
326 | break; | |
327 | } | |
328 | case atype_dynamic: | |
329 | { | |
330 | const struct lttng_event_field *tag_field_generic; | |
331 | const struct lttng_enum_desc *enum_desc; | |
332 | int ret; | |
333 | ||
334 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
335 | enum_desc = tag_field_generic->type.u.basic.enumeration.desc; | |
336 | ret = lttng_enum_create(enum_desc, session); | |
337 | if (ret && ret != -EEXIST) { | |
338 | DBG("Unable to create enum error: (%d)", ret); | |
339 | return ret; | |
340 | } | |
341 | break; | |
342 | } | |
343 | default: | |
344 | /* TODO: nested types when they become supported. */ | |
345 | break; | |
346 | } | |
347 | return 0; | |
348 | } | |
349 | ||
350 | static | |
351 | int lttng_create_all_event_enums(size_t nr_fields, | |
352 | const struct lttng_event_field *event_fields, | |
353 | struct lttng_session *session) | |
354 | { | |
355 | size_t i; | |
356 | int ret; | |
357 | ||
358 | /* For each field, ensure enum is part of the session. */ | |
359 | for (i = 0; i < nr_fields; i++) { | |
360 | const struct lttng_type *type = &event_fields[i].type; | |
361 | ||
362 | ret = lttng_create_enum_check(type, session); | |
363 | if (ret) | |
364 | return ret; | |
365 | } | |
366 | return 0; | |
367 | } | |
368 | ||
369 | static | |
370 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
371 | const struct lttng_ctx_field *ctx_fields, | |
372 | struct lttng_session *session) | |
373 | { | |
374 | size_t i; | |
375 | int ret; | |
376 | ||
377 | /* For each field, ensure enum is part of the session. */ | |
378 | for (i = 0; i < nr_fields; i++) { | |
379 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
380 | ||
381 | ret = lttng_create_enum_check(type, session); | |
382 | if (ret) | |
383 | return ret; | |
384 | } | |
385 | return 0; | |
386 | } | |
387 | ||
388 | ||
7dd08bec | 389 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
390 | { |
391 | int ret = 0; | |
7dd08bec | 392 | struct lttng_channel *chan; |
32ce8569 | 393 | int notify_socket; |
8020ceb5 | 394 | |
8020ceb5 MD |
395 | if (session->active) { |
396 | ret = -EBUSY; | |
397 | goto end; | |
398 | } | |
399 | ||
32ce8569 MD |
400 | notify_socket = lttng_get_notify_socket(session->owner); |
401 | if (notify_socket < 0) | |
402 | return notify_socket; | |
403 | ||
ac6b4ac6 MD |
404 | /* Set transient enabler state to "enabled" */ |
405 | session->tstate = 1; | |
e58095ef | 406 | |
8020ceb5 MD |
407 | /* |
408 | * Snapshot the number of events per channel to know the type of header | |
409 | * we need to use. | |
410 | */ | |
e58095ef | 411 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 412 | const struct lttng_ctx *ctx; |
83e43212 | 413 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 414 | size_t nr_fields = 0; |
6ca18e66 | 415 | uint32_t chan_id; |
32ce8569 MD |
416 | |
417 | /* don't change it if session stop/restart */ | |
8020ceb5 | 418 | if (chan->header_type) |
32ce8569 MD |
419 | continue; |
420 | ctx = chan->ctx; | |
421 | if (ctx) { | |
422 | nr_fields = ctx->nr_fields; | |
83e43212 | 423 | fields = ctx->fields; |
53569322 MD |
424 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
425 | session); | |
426 | if (ret < 0) { | |
427 | DBG("Error (%d) adding enum to session", ret); | |
428 | return ret; | |
429 | } | |
32ce8569 MD |
430 | } |
431 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 432 | session, |
32ce8569 MD |
433 | session->objd, |
434 | chan->objd, | |
435 | nr_fields, | |
436 | fields, | |
6ca18e66 | 437 | &chan_id, |
32ce8569 | 438 | &chan->header_type); |
b869b5ae MD |
439 | if (ret) { |
440 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 441 | return ret; |
b869b5ae | 442 | } |
6ca18e66 MD |
443 | if (chan_id != chan->id) { |
444 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
445 | chan_id, chan->id); | |
446 | return -EINVAL; | |
447 | } | |
8020ceb5 MD |
448 | } |
449 | ||
5c055275 FD |
450 | /* We need to sync enablers with session before activation. */ |
451 | lttng_session_sync_enablers(session); | |
452 | ||
ac6b4ac6 | 453 | /* Set atomically the state to "active" */ |
b5234c06 MD |
454 | CMM_ACCESS_ONCE(session->active) = 1; |
455 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 456 | |
246be17e PW |
457 | session->statedump_pending = 1; |
458 | lttng_ust_sockinfo_session_enabled(session->owner); | |
8020ceb5 | 459 | end: |
8020ceb5 MD |
460 | return ret; |
461 | } | |
462 | ||
7dd08bec | 463 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
464 | { |
465 | int ret = 0; | |
466 | ||
8020ceb5 MD |
467 | if (!session->active) { |
468 | ret = -EBUSY; | |
469 | goto end; | |
470 | } | |
ac6b4ac6 | 471 | /* Set atomically the state to "inactive" */ |
b5234c06 | 472 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
473 | |
474 | /* Set transient enabler state to "disabled" */ | |
475 | session->tstate = 0; | |
476 | lttng_session_sync_enablers(session); | |
8020ceb5 | 477 | end: |
8020ceb5 MD |
478 | return ret; |
479 | } | |
480 | ||
7dd08bec | 481 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 482 | { |
ac6b4ac6 | 483 | int ret = 0; |
976fe9ea | 484 | |
ac6b4ac6 MD |
485 | if (channel->enabled) { |
486 | ret = -EBUSY; | |
487 | goto end; | |
488 | } | |
489 | /* Set transient enabler state to "enabled" */ | |
490 | channel->tstate = 1; | |
491 | lttng_session_sync_enablers(channel->session); | |
492 | /* Set atomically the state to "enabled" */ | |
493 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
494 | end: | |
495 | return ret; | |
976fe9ea MD |
496 | } |
497 | ||
7dd08bec | 498 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 499 | { |
ac6b4ac6 | 500 | int ret = 0; |
976fe9ea | 501 | |
ac6b4ac6 MD |
502 | if (!channel->enabled) { |
503 | ret = -EBUSY; | |
504 | goto end; | |
505 | } | |
506 | /* Set atomically the state to "disabled" */ | |
507 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
508 | /* Set transient enabler state to "enabled" */ | |
509 | channel->tstate = 0; | |
510 | lttng_session_sync_enablers(channel->session); | |
511 | end: | |
512 | return ret; | |
976fe9ea MD |
513 | } |
514 | ||
8020ceb5 MD |
515 | /* |
516 | * Supports event creation while tracing session is active. | |
517 | */ | |
e58095ef MD |
518 | static |
519 | int lttng_event_create(const struct lttng_event_desc *desc, | |
520 | struct lttng_channel *chan) | |
8020ceb5 | 521 | { |
e58095ef | 522 | const char *event_name = desc->name; |
7dd08bec | 523 | struct lttng_event *event; |
32ce8569 | 524 | struct lttng_session *session = chan->session; |
d56fa719 MD |
525 | struct cds_hlist_head *head; |
526 | struct cds_hlist_node *node; | |
576599a0 | 527 | int ret = 0; |
d56fa719 MD |
528 | size_t name_len = strlen(event_name); |
529 | uint32_t hash; | |
32ce8569 MD |
530 | int notify_socket, loglevel; |
531 | const char *uri; | |
8020ceb5 | 532 | |
d56fa719 MD |
533 | hash = jhash(event_name, name_len, 0); |
534 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
535 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef | 536 | assert(event->desc); |
d970f72e MD |
537 | if (!strncmp(event->desc->name, desc->name, |
538 | LTTNG_UST_SYM_NAME_LEN - 1) | |
539 | && chan == event->chan) { | |
576599a0 | 540 | ret = -EEXIST; |
8020ceb5 | 541 | goto exist; |
576599a0 MD |
542 | } |
543 | } | |
457a6b58 | 544 | |
32ce8569 MD |
545 | notify_socket = lttng_get_notify_socket(session->owner); |
546 | if (notify_socket < 0) { | |
547 | ret = notify_socket; | |
548 | goto socket_error; | |
549 | } | |
550 | ||
53569322 MD |
551 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
552 | session); | |
c785c634 MD |
553 | if (ret < 0) { |
554 | DBG("Error (%d) adding enum to session", ret); | |
555 | goto create_enum_error; | |
556 | } | |
557 | ||
457a6b58 MD |
558 | /* |
559 | * Check if loglevel match. Refuse to connect event if not. | |
560 | */ | |
7dd08bec | 561 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
562 | if (!event) { |
563 | ret = -ENOMEM; | |
8020ceb5 | 564 | goto cache_error; |
576599a0 | 565 | } |
8020ceb5 | 566 | event->chan = chan; |
e58095ef | 567 | |
ac6b4ac6 MD |
568 | /* Event will be enabled by enabler sync. */ |
569 | event->enabled = 0; | |
570 | event->registered = 0; | |
e58095ef MD |
571 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
572 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
573 | event->desc = desc; | |
32ce8569 MD |
574 | |
575 | if (desc->loglevel) | |
576 | loglevel = *(*event->desc->loglevel); | |
577 | else | |
578 | loglevel = TRACE_DEFAULT; | |
579 | if (desc->u.ext.model_emf_uri) | |
580 | uri = *(desc->u.ext.model_emf_uri); | |
581 | else | |
582 | uri = NULL; | |
583 | ||
13b21cd6 MD |
584 | /* Fetch event ID from sessiond */ |
585 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 586 | session, |
13b21cd6 MD |
587 | session->objd, |
588 | chan->objd, | |
589 | event_name, | |
590 | loglevel, | |
591 | desc->signature, | |
592 | desc->nr_fields, | |
593 | desc->fields, | |
594 | uri, | |
595 | &event->id); | |
596 | if (ret < 0) { | |
597 | DBG("Error (%d) registering event to sessiond", ret); | |
598 | goto sessiond_register_error; | |
32ce8569 | 599 | } |
2b213b16 | 600 | |
7dd08bec | 601 | /* Populate lttng_event structure before tracepoint registration. */ |
b5234c06 | 602 | cmm_smp_wmb(); |
e58095ef | 603 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 604 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 605 | return 0; |
8020ceb5 | 606 | |
32ce8569 | 607 | sessiond_register_error: |
b5234c06 | 608 | free(event); |
8020ceb5 | 609 | cache_error: |
c785c634 | 610 | create_enum_error: |
32ce8569 | 611 | socket_error: |
8020ceb5 | 612 | exist: |
576599a0 | 613 | return ret; |
8020ceb5 MD |
614 | } |
615 | ||
e58095ef MD |
616 | static |
617 | int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, | |
618 | struct lttng_enabler *enabler) | |
619 | { | |
620 | int loglevel = 0; | |
7e2e405c | 621 | unsigned int has_loglevel = 0; |
e58095ef MD |
622 | |
623 | assert(enabler->type == LTTNG_ENABLER_WILDCARD); | |
624 | /* Compare excluding final '*' */ | |
625 | if (strncmp(desc->name, enabler->event_param.name, | |
626 | strlen(enabler->event_param.name) - 1)) | |
627 | return 0; | |
628 | if (desc->loglevel) { | |
629 | loglevel = *(*desc->loglevel); | |
630 | has_loglevel = 1; | |
631 | } | |
632 | if (!lttng_loglevel_match(loglevel, | |
633 | has_loglevel, | |
634 | enabler->event_param.loglevel_type, | |
635 | enabler->event_param.loglevel)) | |
636 | return 0; | |
637 | return 1; | |
638 | } | |
639 | ||
640 | static | |
641 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
642 | struct lttng_enabler *enabler) | |
643 | { | |
644 | int loglevel = 0; | |
645 | unsigned int has_loglevel = 0; | |
646 | ||
647 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
648 | if (strcmp(desc->name, enabler->event_param.name)) | |
649 | return 0; | |
650 | if (desc->loglevel) { | |
651 | loglevel = *(*desc->loglevel); | |
652 | has_loglevel = 1; | |
653 | } | |
654 | if (!lttng_loglevel_match(loglevel, | |
655 | has_loglevel, | |
656 | enabler->event_param.loglevel_type, | |
657 | enabler->event_param.loglevel)) | |
658 | return 0; | |
659 | return 1; | |
660 | } | |
661 | ||
662 | static | |
663 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
664 | struct lttng_enabler *enabler) | |
665 | { | |
ed5b5bbd JI |
666 | struct lttng_ust_excluder_node *excluder; |
667 | ||
668 | /* If event matches with an excluder, return 'does not match' */ | |
669 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
670 | int count; | |
671 | ||
672 | for (count = 0; count < excluder->excluder.count; count++) { | |
673 | int found, len; | |
674 | char *excluder_name; | |
675 | ||
676 | excluder_name = (char *) (excluder->excluder.names) | |
677 | + count * LTTNG_UST_SYM_NAME_LEN; | |
678 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
679 | if (len > 0 && excluder_name[len - 1] == '*') { | |
680 | found = !strncmp(desc->name, excluder_name, | |
681 | len - 1); | |
682 | } else { | |
683 | found = !strncmp(desc->name, excluder_name, | |
684 | LTTNG_UST_SYM_NAME_LEN - 1); | |
685 | } | |
686 | if (found) { | |
687 | return 0; | |
688 | } | |
689 | } | |
690 | } | |
e58095ef MD |
691 | switch (enabler->type) { |
692 | case LTTNG_ENABLER_WILDCARD: | |
693 | return lttng_desc_match_wildcard_enabler(desc, enabler); | |
694 | case LTTNG_ENABLER_EVENT: | |
695 | return lttng_desc_match_event_enabler(desc, enabler); | |
696 | default: | |
697 | return -EINVAL; | |
698 | } | |
699 | } | |
700 | ||
701 | static | |
702 | int lttng_event_match_enabler(struct lttng_event *event, | |
703 | struct lttng_enabler *enabler) | |
704 | { | |
d970f72e MD |
705 | if (lttng_desc_match_enabler(event->desc, enabler) |
706 | && event->chan == enabler->chan) | |
707 | return 1; | |
708 | else | |
709 | return 0; | |
e58095ef MD |
710 | } |
711 | ||
712 | static | |
713 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
714 | struct lttng_enabler *enabler) | |
715 | { | |
716 | struct lttng_enabler_ref *enabler_ref; | |
717 | ||
718 | cds_list_for_each_entry(enabler_ref, | |
719 | &event->enablers_ref_head, node) { | |
720 | if (enabler_ref->ref == enabler) | |
721 | return enabler_ref; | |
722 | } | |
723 | return NULL; | |
724 | } | |
725 | ||
8020ceb5 | 726 | /* |
e58095ef MD |
727 | * Create struct lttng_event if it is missing and present in the list of |
728 | * tracepoint probes. | |
8020ceb5 | 729 | */ |
e58095ef MD |
730 | static |
731 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 732 | { |
e58095ef MD |
733 | struct lttng_session *session = enabler->chan->session; |
734 | struct lttng_probe_desc *probe_desc; | |
735 | const struct lttng_event_desc *desc; | |
736 | struct lttng_event *event; | |
737 | int i; | |
738 | struct cds_list_head *probe_list; | |
739 | ||
740 | probe_list = lttng_get_probe_list_head(); | |
741 | /* | |
742 | * For each probe event, if we find that a probe event matches | |
743 | * our enabler, create an associated lttng_event if not | |
744 | * already present. | |
745 | */ | |
746 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
747 | for (i = 0; i < probe_desc->nr_events; i++) { | |
748 | int found = 0, ret; | |
d56fa719 MD |
749 | struct cds_hlist_head *head; |
750 | struct cds_hlist_node *node; | |
751 | const char *event_name; | |
752 | size_t name_len; | |
753 | uint32_t hash; | |
e58095ef MD |
754 | |
755 | desc = probe_desc->event_desc[i]; | |
756 | if (!lttng_desc_match_enabler(desc, enabler)) | |
757 | continue; | |
d56fa719 MD |
758 | event_name = desc->name; |
759 | name_len = strlen(event_name); | |
e58095ef MD |
760 | |
761 | /* | |
d56fa719 | 762 | * Check if already created. |
e58095ef | 763 | */ |
d56fa719 MD |
764 | hash = jhash(event_name, name_len, 0); |
765 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
766 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
d970f72e MD |
767 | if (event->desc == desc |
768 | && event->chan == enabler->chan) | |
e58095ef MD |
769 | found = 1; |
770 | } | |
771 | if (found) | |
772 | continue; | |
773 | ||
774 | /* | |
775 | * We need to create an event for this | |
776 | * event probe. | |
777 | */ | |
778 | ret = lttng_event_create(probe_desc->event_desc[i], | |
779 | enabler->chan); | |
780 | if (ret) { | |
32ce8569 MD |
781 | DBG("Unable to create event %s, error %d\n", |
782 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 783 | } |
8165c8da | 784 | } |
8020ceb5 | 785 | } |
8020ceb5 MD |
786 | } |
787 | ||
788 | /* | |
e58095ef MD |
789 | * Create events associated with an enabler (if not already present), |
790 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
791 | */ |
792 | static | |
e58095ef | 793 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 794 | { |
e58095ef MD |
795 | struct lttng_session *session = enabler->chan->session; |
796 | struct lttng_event *event; | |
797 | ||
798 | /* First ensure that probe events are created for this enabler. */ | |
799 | lttng_create_event_if_missing(enabler); | |
800 | ||
801 | /* For each event matching enabler in session event list. */ | |
802 | cds_list_for_each_entry(event, &session->events_head, node) { | |
803 | struct lttng_enabler_ref *enabler_ref; | |
804 | ||
805 | if (!lttng_event_match_enabler(event, enabler)) | |
806 | continue; | |
807 | ||
808 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
809 | if (!enabler_ref) { | |
810 | /* | |
811 | * If no backward ref, create it. | |
812 | * Add backward ref from event to enabler. | |
813 | */ | |
814 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
815 | if (!enabler_ref) | |
816 | return -ENOMEM; | |
817 | enabler_ref->ref = enabler; | |
818 | cds_list_add(&enabler_ref->node, | |
819 | &event->enablers_ref_head); | |
8165c8da | 820 | } |
e58095ef MD |
821 | |
822 | /* | |
823 | * Link filter bytecodes if not linked yet. | |
824 | */ | |
825 | lttng_enabler_event_link_bytecode(event, enabler); | |
826 | ||
827 | /* TODO: merge event context. */ | |
828 | } | |
829 | return 0; | |
830 | } | |
831 | ||
832 | /* | |
833 | * Called at library load: connect the probe on all enablers matching | |
834 | * this event. | |
5f733922 | 835 | * Called with session mutex held. |
e58095ef | 836 | */ |
5f733922 | 837 | int lttng_fix_pending_events(void) |
e58095ef MD |
838 | { |
839 | struct lttng_session *session; | |
840 | ||
841 | cds_list_for_each_entry(session, &sessions, node) { | |
842 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 843 | } |
e58095ef MD |
844 | return 0; |
845 | } | |
846 | ||
246be17e | 847 | /* |
37dddb65 MD |
848 | * For each session of the owner thread, execute pending statedump. |
849 | * Only dump state for the sessions owned by the caller thread, because | |
850 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 851 | */ |
3327ac33 | 852 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
853 | { |
854 | struct lttng_session *session; | |
855 | ||
37dddb65 | 856 | /* Execute state dump */ |
cf73e0fe | 857 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
858 | |
859 | /* Clear pending state dump */ | |
3327ac33 MD |
860 | if (ust_lock()) { |
861 | goto end; | |
862 | } | |
246be17e | 863 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
864 | if (session->owner != owner) |
865 | continue; | |
866 | if (!session->statedump_pending) | |
867 | continue; | |
868 | session->statedump_pending = 0; | |
246be17e | 869 | } |
3327ac33 | 870 | end: |
37dddb65 | 871 | ust_unlock(); |
3327ac33 | 872 | return; |
246be17e PW |
873 | } |
874 | ||
e58095ef MD |
875 | /* |
876 | * Only used internally at session destruction. | |
877 | */ | |
878 | static | |
879 | void _lttng_event_destroy(struct lttng_event *event) | |
880 | { | |
881 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
882 | ||
e58095ef | 883 | cds_list_del(&event->node); |
8020ceb5 | 884 | lttng_destroy_context(event->ctx); |
f488575f | 885 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
886 | /* Free event enabler refs */ |
887 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
888 | &event->enablers_ref_head, node) | |
889 | free(enabler_ref); | |
b5234c06 | 890 | free(event); |
8020ceb5 MD |
891 | } |
892 | ||
c785c634 MD |
893 | static |
894 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
895 | { | |
896 | cds_list_del(&_enum->node); | |
897 | free(_enum); | |
898 | } | |
899 | ||
003fedf4 | 900 | void lttng_ust_events_exit(void) |
8020ceb5 | 901 | { |
7dd08bec | 902 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 903 | |
e58095ef | 904 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 905 | lttng_session_destroy(session); |
8020ceb5 | 906 | } |
457a6b58 | 907 | |
e58095ef MD |
908 | /* |
909 | * Enabler management. | |
910 | */ | |
911 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
912 | struct lttng_ust_event *event_param, | |
913 | struct lttng_channel *chan) | |
457a6b58 | 914 | { |
e58095ef MD |
915 | struct lttng_enabler *enabler; |
916 | ||
917 | enabler = zmalloc(sizeof(*enabler)); | |
918 | if (!enabler) | |
919 | return NULL; | |
920 | enabler->type = type; | |
921 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
0f63324a | 922 | CDS_INIT_LIST_HEAD(&enabler->excluder_head); |
e58095ef MD |
923 | memcpy(&enabler->event_param, event_param, |
924 | sizeof(enabler->event_param)); | |
925 | enabler->chan = chan; | |
926 | /* ctx left NULL */ | |
89f26d57 | 927 | enabler->enabled = 0; |
e58095ef MD |
928 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); |
929 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
930 | return enabler; | |
457a6b58 MD |
931 | } |
932 | ||
e58095ef | 933 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 934 | { |
e58095ef MD |
935 | enabler->enabled = 1; |
936 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
937 | return 0; | |
457a6b58 | 938 | } |
457a6b58 | 939 | |
e58095ef | 940 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 941 | { |
e58095ef MD |
942 | enabler->enabled = 0; |
943 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
944 | return 0; | |
945 | } | |
457a6b58 | 946 | |
e58095ef MD |
947 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
948 | struct lttng_ust_filter_bytecode_node *bytecode) | |
949 | { | |
950 | bytecode->enabler = enabler; | |
951 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
952 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
953 | return 0; | |
0bfb5cbd JI |
954 | } |
955 | ||
956 | int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
957 | struct lttng_ust_excluder_node *excluder) | |
958 | { | |
959 | excluder->enabler = enabler; | |
960 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
961 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
962 | return 0; | |
e58095ef | 963 | } |
f488575f | 964 | |
e58095ef | 965 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 966 | union ust_args *uargs, |
e58095ef MD |
967 | struct lttng_ctx **ctx, struct lttng_session *session) |
968 | { | |
457a6b58 | 969 | /* |
e58095ef MD |
970 | * We cannot attach a context after trace has been started for a |
971 | * session because the metadata does not allow expressing this | |
972 | * information outside of the original channel scope. | |
457a6b58 | 973 | */ |
e58095ef MD |
974 | if (session->been_active) |
975 | return -EPERM; | |
457a6b58 | 976 | |
e58095ef MD |
977 | switch (context_param->ctx) { |
978 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
979 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
980 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
981 | { | |
982 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
983 | ||
984 | perf_ctx_param = &context_param->u.perf_counter; | |
985 | return lttng_add_perf_counter_to_ctx( | |
986 | perf_ctx_param->type, | |
987 | perf_ctx_param->config, | |
988 | perf_ctx_param->name, | |
989 | ctx); | |
990 | } | |
e58095ef MD |
991 | case LTTNG_UST_CONTEXT_VTID: |
992 | return lttng_add_vtid_to_ctx(ctx); | |
993 | case LTTNG_UST_CONTEXT_VPID: | |
994 | return lttng_add_vpid_to_ctx(ctx); | |
995 | case LTTNG_UST_CONTEXT_PROCNAME: | |
996 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
997 | case LTTNG_UST_CONTEXT_IP: |
998 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
999 | case LTTNG_UST_CONTEXT_CPU_ID: |
1000 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1001 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1002 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1003 | ctx); | |
e58095ef MD |
1004 | default: |
1005 | return -EINVAL; | |
457a6b58 | 1006 | } |
457a6b58 MD |
1007 | } |
1008 | ||
e58095ef MD |
1009 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1010 | struct lttng_ust_context *context_param) | |
457a6b58 | 1011 | { |
e58095ef MD |
1012 | #if 0 // disabled for now. |
1013 | struct lttng_session *session = enabler->chan->session; | |
1014 | int ret; | |
457a6b58 | 1015 | |
e58095ef MD |
1016 | ret = lttng_attach_context(context_param, &enabler->ctx, |
1017 | session); | |
1018 | if (ret) | |
1019 | return ret; | |
1020 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1021 | #endif | |
1022 | return -ENOSYS; | |
457a6b58 MD |
1023 | } |
1024 | ||
e58095ef MD |
1025 | static |
1026 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 1027 | { |
e58095ef | 1028 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
0f63324a | 1029 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
457a6b58 | 1030 | |
e58095ef MD |
1031 | /* Destroy filter bytecode */ |
1032 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1033 | &enabler->filter_bytecode_head, node) { | |
1034 | free(filter_node); | |
457a6b58 | 1035 | } |
e58095ef | 1036 | |
0f63324a JI |
1037 | /* Destroy excluders */ |
1038 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
1039 | &enabler->excluder_head, node) { | |
1040 | free(excluder_node); | |
1041 | } | |
1042 | ||
e58095ef MD |
1043 | /* Destroy contexts */ |
1044 | lttng_destroy_context(enabler->ctx); | |
1045 | ||
1046 | cds_list_del(&enabler->node); | |
1047 | free(enabler); | |
457a6b58 MD |
1048 | } |
1049 | ||
e58095ef MD |
1050 | /* |
1051 | * lttng_session_sync_enablers should be called just before starting a | |
1052 | * session. | |
1053 | */ | |
457a6b58 | 1054 | static |
e58095ef | 1055 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 1056 | { |
e58095ef MD |
1057 | struct lttng_enabler *enabler; |
1058 | struct lttng_event *event; | |
457a6b58 | 1059 | |
e58095ef MD |
1060 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
1061 | lttng_enabler_ref_events(enabler); | |
1062 | /* | |
1063 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1064 | * and its channel and session transient states are enabled, we |
1065 | * enable the event, else we disable it. | |
e58095ef MD |
1066 | */ |
1067 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1068 | struct lttng_enabler_ref *enabler_ref; | |
1069 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1070 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1071 | |
1072 | /* Enable events */ | |
1073 | cds_list_for_each_entry(enabler_ref, | |
1074 | &event->enablers_ref_head, node) { | |
1075 | if (enabler_ref->ref->enabled) { | |
1076 | enabled = 1; | |
1077 | break; | |
1078 | } | |
1079 | } | |
ac6b4ac6 MD |
1080 | /* |
1081 | * Enabled state is based on union of enablers, with | |
1082 | * intesection of session and channel transient enable | |
1083 | * states. | |
1084 | */ | |
1085 | enabled = enabled && session->tstate && event->chan->tstate; | |
1086 | ||
1087 | CMM_STORE_SHARED(event->enabled, enabled); | |
1088 | /* | |
1089 | * Sync tracepoint registration with event enabled | |
1090 | * state. | |
1091 | */ | |
1092 | if (enabled) { | |
1093 | if (!event->registered) | |
1094 | register_event(event); | |
1095 | } else { | |
1096 | if (event->registered) | |
1097 | unregister_event(event); | |
1098 | } | |
457a6b58 | 1099 | |
1f49fc05 | 1100 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1101 | cds_list_for_each_entry(enabler_ref, |
1102 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1103 | if (enabler_ref->ref->enabled |
1104 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1105 | has_enablers_without_bytecode = 1; |
1106 | break; | |
1107 | } | |
1108 | } | |
1109 | event->has_enablers_without_bytecode = | |
1110 | has_enablers_without_bytecode; | |
1111 | ||
e58095ef MD |
1112 | /* Enable filters */ |
1113 | cds_list_for_each_entry(runtime, | |
1114 | &event->bytecode_runtime_head, node) { | |
1115 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
1116 | } |
1117 | } | |
b553ed99 | 1118 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1119 | } |
1120 | ||
e58095ef MD |
1121 | /* |
1122 | * Apply enablers to session events, adding events to session if need | |
1123 | * be. It is required after each modification applied to an active | |
1124 | * session, and right before session "start". | |
1125 | * "lazy" sync means we only sync if required. | |
1126 | */ | |
1127 | static | |
1128 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 1129 | { |
e58095ef MD |
1130 | /* We can skip if session is not active */ |
1131 | if (!session->active) | |
1132 | return; | |
1133 | lttng_session_sync_enablers(session); | |
457a6b58 | 1134 | } |
53569322 MD |
1135 | |
1136 | /* | |
1137 | * Update all sessions with the given app context. | |
1138 | * Called with ust lock held. | |
1139 | * This is invoked when an application context gets loaded/unloaded. It | |
1140 | * ensures the context callbacks are in sync with the application | |
1141 | * context (either app context callbacks, or dummy callbacks). | |
1142 | */ | |
1143 | void lttng_ust_context_set_session_provider(const char *name, | |
1144 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1145 | void (*record)(struct lttng_ctx_field *field, | |
1146 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1147 | struct lttng_channel *chan), | |
1148 | void (*get_value)(struct lttng_ctx_field *field, | |
1149 | struct lttng_ctx_value *value)) | |
1150 | { | |
1151 | struct lttng_session *session; | |
1152 | ||
1153 | cds_list_for_each_entry(session, &sessions, node) { | |
1154 | struct lttng_channel *chan; | |
1155 | struct lttng_event *event; | |
1156 | int ret; | |
1157 | ||
1158 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1159 | name, get_size, record, get_value); | |
1160 | if (ret) | |
1161 | abort(); | |
1162 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1163 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1164 | name, get_size, record, get_value); | |
1165 | if (ret) | |
1166 | abort(); | |
1167 | } | |
1168 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1169 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1170 | name, get_size, record, get_value); | |
1171 | if (ret) | |
1172 | abort(); | |
1173 | } | |
1174 | } | |
1175 | } |