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 | 23 | #define _GNU_SOURCE |
3fbec7dc | 24 | #define _LGPL_SOURCE |
b5234c06 | 25 | #include <stdio.h> |
d5fc3224 | 26 | #include <assert.h> |
b5234c06 | 27 | #include <errno.h> |
d5fc3224 FD |
28 | #include <limits.h> |
29 | #include <pthread.h> | |
f4681817 MD |
30 | #include <sys/shm.h> |
31 | #include <sys/ipc.h> | |
44c72f10 MD |
32 | #include <stdint.h> |
33 | #include <stddef.h> | |
28b12049 MD |
34 | #include <inttypes.h> |
35 | #include <time.h> | |
196ec2df | 36 | #include <stdbool.h> |
d5fc3224 | 37 | #include <unistd.h> |
2ae57758 | 38 | #include <lttng/ust-endian.h> |
44c72f10 MD |
39 | |
40 | #include <urcu-bp.h> | |
d5fc3224 | 41 | #include <urcu/arch.h> |
44c72f10 | 42 | #include <urcu/compiler.h> |
d5fc3224 FD |
43 | #include <urcu/hlist.h> |
44 | #include <urcu/list.h> | |
44c72f10 | 45 | #include <urcu/uatomic.h> |
44c72f10 MD |
46 | |
47 | #include <lttng/tracepoint.h> | |
4318ae1b | 48 | #include <lttng/ust-events.h> |
44c72f10 MD |
49 | |
50 | #include <usterr-signal-safe.h> | |
51 | #include <helper.h> | |
7d3e35b6 | 52 | #include <lttng/ust-ctl.h> |
32ce8569 | 53 | #include <ust-comm.h> |
d5fc3224 | 54 | #include <ust-fd.h> |
53569322 MD |
55 | #include <lttng/ust-dynamic-type.h> |
56 | #include <lttng/ust-context-provider.h> | |
1f18504e | 57 | #include "error.h" |
08114193 | 58 | #include "compat.h" |
eda498b8 | 59 | #include "lttng-ust-uuid.h" |
44c72f10 | 60 | |
457a6b58 | 61 | #include "tracepoint-internal.h" |
196ec2df | 62 | #include "string-utils.h" |
7dd08bec MD |
63 | #include "lttng-tracer.h" |
64 | #include "lttng-tracer-core.h" | |
cf73e0fe | 65 | #include "lttng-ust-statedump.h" |
d5fc3224 FD |
66 | #include "share.h" |
67 | #include "ust-events-internal.h" | |
b728d87e | 68 | #include "wait.h" |
8d8a24c8 | 69 | #include "../libringbuffer/shm.h" |
596c4223 | 70 | #include "jhash.h" |
d5fc3224 | 71 | #include "ust-abi.h" |
8165c8da MD |
72 | |
73 | /* | |
3327ac33 MD |
74 | * All operations within this file are called by the communication |
75 | * thread, under ust_lock protection. | |
8165c8da | 76 | */ |
8165c8da | 77 | |
b5234c06 | 78 | static CDS_LIST_HEAD(sessions); |
d5fc3224 | 79 | static CDS_LIST_HEAD(trigger_groups); |
8165c8da | 80 | |
37dddb65 MD |
81 | struct cds_list_head *_lttng_get_sessions(void) |
82 | { | |
83 | return &sessions; | |
84 | } | |
85 | ||
7dd08bec | 86 | static void _lttng_event_destroy(struct lttng_event *event); |
d5fc3224 | 87 | static void _lttng_trigger_destroy(struct lttng_trigger *trigger); |
c785c634 | 88 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 89 | |
e58095ef | 90 | static |
d5fc3224 FD |
91 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
92 | static | |
93 | void lttng_session_sync_event_enablers(struct lttng_session *session); | |
e58095ef | 94 | static |
d5fc3224 | 95 | void lttng_trigger_group_sync_enablers(struct lttng_trigger_group *trigger_group); |
e58095ef MD |
96 | static |
97 | void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
98 | ||
6715d7d1 MD |
99 | /* |
100 | * Called with ust lock held. | |
101 | */ | |
102 | int lttng_session_active(void) | |
103 | { | |
104 | struct lttng_session *iter; | |
105 | ||
106 | cds_list_for_each_entry(iter, &sessions, node) { | |
107 | if (iter->active) | |
108 | return 1; | |
109 | } | |
110 | return 0; | |
111 | } | |
112 | ||
e58095ef MD |
113 | static |
114 | int lttng_loglevel_match(int loglevel, | |
115 | unsigned int has_loglevel, | |
457a6b58 MD |
116 | enum lttng_ust_loglevel_type req_type, |
117 | int req_loglevel) | |
118 | { | |
e58095ef MD |
119 | if (!has_loglevel) |
120 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
121 | switch (req_type) { |
122 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 123 | if (loglevel <= req_loglevel |
67ada458 | 124 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
125 | return 1; |
126 | else | |
127 | return 0; | |
128 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 129 | if (loglevel == req_loglevel |
67ada458 | 130 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
131 | return 1; |
132 | else | |
133 | return 0; | |
134 | case LTTNG_UST_LOGLEVEL_ALL: | |
135 | default: | |
67ada458 | 136 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
137 | return 1; |
138 | else | |
139 | return 0; | |
457a6b58 MD |
140 | } |
141 | } | |
142 | ||
8020ceb5 MD |
143 | void synchronize_trace(void) |
144 | { | |
8020ceb5 | 145 | synchronize_rcu(); |
8020ceb5 MD |
146 | } |
147 | ||
7dd08bec | 148 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 149 | { |
7dd08bec | 150 | struct lttng_session *session; |
74d81a6c | 151 | int i; |
8020ceb5 | 152 | |
7dd08bec | 153 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
154 | if (!session) |
155 | return NULL; | |
53569322 MD |
156 | if (lttng_session_context_init(&session->ctx)) { |
157 | free(session); | |
158 | return NULL; | |
159 | } | |
e58095ef MD |
160 | CDS_INIT_LIST_HEAD(&session->chan_head); |
161 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 162 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 163 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
164 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
165 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
166 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
167 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 168 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
169 | return session; |
170 | } | |
171 | ||
d5fc3224 FD |
172 | struct lttng_trigger_group *lttng_trigger_group_create(void) |
173 | { | |
174 | struct lttng_trigger_group *trigger_group; | |
175 | int i; | |
176 | ||
177 | trigger_group = zmalloc(sizeof(struct lttng_trigger_group)); | |
178 | if (!trigger_group) | |
179 | return NULL; | |
180 | ||
181 | CDS_INIT_LIST_HEAD(&trigger_group->enablers_head); | |
182 | CDS_INIT_LIST_HEAD(&trigger_group->triggers_head); | |
183 | for (i = 0; i < LTTNG_UST_TRIGGER_HT_SIZE; i++) | |
184 | CDS_INIT_HLIST_HEAD(&trigger_group->triggers_ht.table[i]); | |
185 | ||
186 | cds_list_add(&trigger_group->node, &trigger_groups); | |
187 | ||
188 | return trigger_group; | |
189 | } | |
190 | ||
74d81a6c MD |
191 | /* |
192 | * Only used internally at session destruction. | |
193 | */ | |
194 | static | |
195 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
196 | { | |
197 | struct channel *chan; | |
198 | struct lttng_ust_shm_handle *handle; | |
199 | ||
200 | cds_list_del(<tng_chan->node); | |
201 | lttng_destroy_context(lttng_chan->ctx); | |
202 | chan = lttng_chan->chan; | |
203 | handle = lttng_chan->handle; | |
204 | /* | |
205 | * note: lttng_chan is private data contained within handle. It | |
206 | * will be freed along with the handle. | |
207 | */ | |
208 | channel_destroy(chan, handle, 0); | |
209 | } | |
210 | ||
ac6b4ac6 MD |
211 | static |
212 | void register_event(struct lttng_event *event) | |
213 | { | |
214 | int ret; | |
215 | const struct lttng_event_desc *desc; | |
216 | ||
217 | assert(event->registered == 0); | |
218 | desc = event->desc; | |
baa1e0bc | 219 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
220 | desc->probe_callback, |
221 | event, desc->signature); | |
222 | WARN_ON_ONCE(ret); | |
223 | if (!ret) | |
224 | event->registered = 1; | |
225 | } | |
226 | ||
d5fc3224 FD |
227 | static |
228 | void register_trigger(struct lttng_trigger *trigger) | |
229 | { | |
230 | int ret; | |
231 | const struct lttng_event_desc *desc; | |
232 | ||
233 | assert(trigger->registered == 0); | |
234 | desc = trigger->desc; | |
235 | ret = __tracepoint_probe_register_queue_release(desc->name, | |
236 | desc->u.ext.trigger_callback, trigger, desc->signature); | |
237 | WARN_ON_ONCE(ret); | |
238 | if (!ret) | |
239 | trigger->registered = 1; | |
240 | } | |
241 | ||
ac6b4ac6 MD |
242 | static |
243 | void unregister_event(struct lttng_event *event) | |
244 | { | |
245 | int ret; | |
246 | const struct lttng_event_desc *desc; | |
247 | ||
248 | assert(event->registered == 1); | |
249 | desc = event->desc; | |
baa1e0bc | 250 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
251 | desc->probe_callback, |
252 | event); | |
253 | WARN_ON_ONCE(ret); | |
254 | if (!ret) | |
255 | event->registered = 0; | |
256 | } | |
257 | ||
d5fc3224 FD |
258 | static |
259 | void unregister_trigger(struct lttng_trigger *trigger) | |
260 | { | |
261 | int ret; | |
262 | const struct lttng_event_desc *desc; | |
263 | ||
264 | assert(trigger->registered == 1); | |
265 | desc = trigger->desc; | |
266 | ret = __tracepoint_probe_unregister_queue_release(desc->name, | |
267 | desc->u.ext.trigger_callback, trigger); | |
268 | WARN_ON_ONCE(ret); | |
269 | if (!ret) | |
270 | trigger->registered = 0; | |
271 | } | |
272 | ||
ac6b4ac6 MD |
273 | /* |
274 | * Only used internally at session destruction. | |
275 | */ | |
276 | static | |
277 | void _lttng_event_unregister(struct lttng_event *event) | |
278 | { | |
279 | if (event->registered) | |
280 | unregister_event(event); | |
281 | } | |
282 | ||
d5fc3224 FD |
283 | /* |
284 | * Only used internally at session destruction. | |
285 | */ | |
286 | static | |
287 | void _lttng_trigger_unregister(struct lttng_trigger *trigger) | |
288 | { | |
289 | if (trigger->registered) | |
290 | unregister_trigger(trigger); | |
291 | } | |
292 | ||
7dd08bec | 293 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 294 | { |
7dd08bec MD |
295 | struct lttng_channel *chan, *tmpchan; |
296 | struct lttng_event *event, *tmpevent; | |
c785c634 | 297 | struct lttng_enum *_enum, *tmp_enum; |
d5fc3224 | 298 | struct lttng_event_enabler *event_enabler, *event_tmpenabler; |
8020ceb5 | 299 | |
b5234c06 | 300 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 301 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 302 | _lttng_event_unregister(event); |
8020ceb5 MD |
303 | } |
304 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
baa1e0bc | 305 | __tracepoint_probe_prune_release_queue(); |
d5fc3224 | 306 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
e58095ef | 307 | &session->enablers_head, node) |
d5fc3224 | 308 | lttng_event_enabler_destroy(event_enabler); |
e58095ef MD |
309 | cds_list_for_each_entry_safe(event, tmpevent, |
310 | &session->events_head, node) | |
7dd08bec | 311 | _lttng_event_destroy(event); |
c785c634 MD |
312 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
313 | &session->enums_head, node) | |
314 | _lttng_enum_destroy(_enum); | |
e58095ef | 315 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 316 | _lttng_channel_unmap(chan); |
e58095ef | 317 | cds_list_del(&session->node); |
53569322 | 318 | lttng_destroy_context(session->ctx); |
b5234c06 | 319 | free(session); |
8020ceb5 MD |
320 | } |
321 | ||
d5fc3224 FD |
322 | void lttng_trigger_group_destroy( |
323 | struct lttng_trigger_group *trigger_group) | |
324 | { | |
325 | int close_ret; | |
326 | struct lttng_trigger_enabler *trigger_enabler, *tmptrigger_enabler; | |
327 | struct lttng_trigger *trigger, *tmptrigger; | |
328 | ||
329 | if (!trigger_group) { | |
330 | return; | |
331 | } | |
332 | ||
333 | cds_list_for_each_entry(trigger, &trigger_group->triggers_head, node) | |
334 | _lttng_trigger_unregister(trigger); | |
335 | ||
336 | synchronize_trace(); | |
337 | ||
338 | cds_list_for_each_entry_safe(trigger_enabler, tmptrigger_enabler, | |
339 | &trigger_group->enablers_head, node) | |
340 | lttng_trigger_enabler_destroy(trigger_enabler); | |
341 | ||
342 | cds_list_for_each_entry_safe(trigger, tmptrigger, | |
343 | &trigger_group->triggers_head, node) | |
344 | _lttng_trigger_destroy(trigger); | |
345 | ||
346 | /* Close the notification fd to the listener of triggers. */ | |
347 | ||
348 | lttng_ust_lock_fd_tracker(); | |
349 | close_ret = close(trigger_group->notification_fd); | |
350 | if (!close_ret) { | |
351 | lttng_ust_delete_fd_from_tracker(trigger_group->notification_fd); | |
352 | } else { | |
353 | PERROR("close"); | |
354 | abort(); | |
355 | } | |
356 | lttng_ust_unlock_fd_tracker(); | |
357 | ||
358 | cds_list_del(&trigger_group->node); | |
359 | ||
360 | free(trigger_group); | |
361 | } | |
362 | ||
363 | static | |
364 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
365 | { | |
366 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; | |
367 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; | |
368 | ||
369 | if (!enabler) { | |
370 | return; | |
371 | } | |
372 | ||
373 | /* Destroy filter bytecode */ | |
374 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
375 | &enabler->filter_bytecode_head, node) { | |
376 | free(filter_node); | |
377 | } | |
378 | ||
379 | /* Destroy excluders */ | |
380 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
381 | &enabler->excluder_head, node) { | |
382 | free(excluder_node); | |
383 | } | |
384 | } | |
385 | ||
386 | void lttng_trigger_enabler_destroy(struct lttng_trigger_enabler *trigger_enabler) | |
387 | { | |
388 | if (!trigger_enabler) { | |
389 | return; | |
390 | } | |
391 | ||
392 | cds_list_del(&trigger_enabler->node); | |
393 | ||
394 | lttng_enabler_destroy(lttng_trigger_enabler_as_enabler(trigger_enabler)); | |
395 | ||
396 | free(trigger_enabler); | |
397 | } | |
398 | ||
53569322 MD |
399 | static |
400 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
401 | struct lttng_session *session) | |
402 | { | |
403 | const char *enum_name = desc->name; | |
404 | struct lttng_enum *_enum; | |
405 | struct cds_hlist_head *head; | |
53569322 MD |
406 | int ret = 0; |
407 | size_t name_len = strlen(enum_name); | |
408 | uint32_t hash; | |
409 | int notify_socket; | |
410 | ||
b33b46f7 | 411 | /* Check if this enum is already registered for this session. */ |
53569322 MD |
412 | hash = jhash(enum_name, name_len, 0); |
413 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
b33b46f7 FD |
414 | |
415 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
416 | if (_enum) { | |
417 | ret = -EEXIST; | |
418 | goto exist; | |
53569322 MD |
419 | } |
420 | ||
421 | notify_socket = lttng_get_notify_socket(session->owner); | |
422 | if (notify_socket < 0) { | |
423 | ret = notify_socket; | |
424 | goto socket_error; | |
425 | } | |
426 | ||
427 | _enum = zmalloc(sizeof(*_enum)); | |
428 | if (!_enum) { | |
429 | ret = -ENOMEM; | |
430 | goto cache_error; | |
431 | } | |
432 | _enum->session = session; | |
433 | _enum->desc = desc; | |
434 | ||
435 | ret = ustcomm_register_enum(notify_socket, | |
436 | session->objd, | |
437 | enum_name, | |
438 | desc->nr_entries, | |
439 | desc->entries, | |
440 | &_enum->id); | |
441 | if (ret < 0) { | |
442 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
443 | goto sessiond_register_error; | |
444 | } | |
445 | cds_list_add(&_enum->node, &session->enums_head); | |
446 | cds_hlist_add_head(&_enum->hlist, head); | |
447 | return 0; | |
448 | ||
449 | sessiond_register_error: | |
450 | free(_enum); | |
451 | cache_error: | |
452 | socket_error: | |
453 | exist: | |
454 | return ret; | |
455 | } | |
456 | ||
457 | static | |
458 | int lttng_create_enum_check(const struct lttng_type *type, | |
459 | struct lttng_session *session) | |
460 | { | |
461 | switch (type->atype) { | |
462 | case atype_enum: | |
463 | { | |
464 | const struct lttng_enum_desc *enum_desc; | |
465 | int ret; | |
466 | ||
467 | enum_desc = type->u.basic.enumeration.desc; | |
468 | ret = lttng_enum_create(enum_desc, session); | |
469 | if (ret && ret != -EEXIST) { | |
470 | DBG("Unable to create enum error: (%d)", ret); | |
471 | return ret; | |
472 | } | |
473 | break; | |
474 | } | |
475 | case atype_dynamic: | |
476 | { | |
477 | const struct lttng_event_field *tag_field_generic; | |
478 | const struct lttng_enum_desc *enum_desc; | |
479 | int ret; | |
480 | ||
481 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
482 | enum_desc = tag_field_generic->type.u.basic.enumeration.desc; | |
483 | ret = lttng_enum_create(enum_desc, session); | |
484 | if (ret && ret != -EEXIST) { | |
485 | DBG("Unable to create enum error: (%d)", ret); | |
486 | return ret; | |
487 | } | |
488 | break; | |
489 | } | |
490 | default: | |
491 | /* TODO: nested types when they become supported. */ | |
492 | break; | |
493 | } | |
494 | return 0; | |
495 | } | |
496 | ||
497 | static | |
498 | int lttng_create_all_event_enums(size_t nr_fields, | |
499 | const struct lttng_event_field *event_fields, | |
500 | struct lttng_session *session) | |
501 | { | |
502 | size_t i; | |
503 | int ret; | |
504 | ||
505 | /* For each field, ensure enum is part of the session. */ | |
506 | for (i = 0; i < nr_fields; i++) { | |
507 | const struct lttng_type *type = &event_fields[i].type; | |
508 | ||
509 | ret = lttng_create_enum_check(type, session); | |
510 | if (ret) | |
511 | return ret; | |
512 | } | |
513 | return 0; | |
514 | } | |
515 | ||
516 | static | |
517 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
518 | const struct lttng_ctx_field *ctx_fields, | |
519 | struct lttng_session *session) | |
520 | { | |
521 | size_t i; | |
522 | int ret; | |
523 | ||
524 | /* For each field, ensure enum is part of the session. */ | |
525 | for (i = 0; i < nr_fields; i++) { | |
526 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
527 | ||
528 | ret = lttng_create_enum_check(type, session); | |
529 | if (ret) | |
530 | return ret; | |
531 | } | |
532 | return 0; | |
533 | } | |
534 | ||
710b8ee3 MD |
535 | /* |
536 | * Ensure that a state-dump will be performed for this session at the end | |
537 | * of the current handle_message(). | |
538 | */ | |
539 | int lttng_session_statedump(struct lttng_session *session) | |
540 | { | |
541 | session->statedump_pending = 1; | |
542 | lttng_ust_sockinfo_session_enabled(session->owner); | |
543 | return 0; | |
544 | } | |
53569322 | 545 | |
7dd08bec | 546 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
547 | { |
548 | int ret = 0; | |
7dd08bec | 549 | struct lttng_channel *chan; |
32ce8569 | 550 | int notify_socket; |
8020ceb5 | 551 | |
8020ceb5 MD |
552 | if (session->active) { |
553 | ret = -EBUSY; | |
554 | goto end; | |
555 | } | |
556 | ||
32ce8569 MD |
557 | notify_socket = lttng_get_notify_socket(session->owner); |
558 | if (notify_socket < 0) | |
559 | return notify_socket; | |
560 | ||
ac6b4ac6 MD |
561 | /* Set transient enabler state to "enabled" */ |
562 | session->tstate = 1; | |
e58095ef | 563 | |
3ff7660f | 564 | /* We need to sync enablers with session before activation. */ |
d5fc3224 | 565 | lttng_session_sync_event_enablers(session); |
3ff7660f | 566 | |
8020ceb5 MD |
567 | /* |
568 | * Snapshot the number of events per channel to know the type of header | |
569 | * we need to use. | |
570 | */ | |
e58095ef | 571 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 572 | const struct lttng_ctx *ctx; |
83e43212 | 573 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 574 | size_t nr_fields = 0; |
6ca18e66 | 575 | uint32_t chan_id; |
32ce8569 MD |
576 | |
577 | /* don't change it if session stop/restart */ | |
8020ceb5 | 578 | if (chan->header_type) |
32ce8569 MD |
579 | continue; |
580 | ctx = chan->ctx; | |
581 | if (ctx) { | |
582 | nr_fields = ctx->nr_fields; | |
83e43212 | 583 | fields = ctx->fields; |
53569322 MD |
584 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
585 | session); | |
586 | if (ret < 0) { | |
587 | DBG("Error (%d) adding enum to session", ret); | |
588 | return ret; | |
589 | } | |
32ce8569 MD |
590 | } |
591 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 592 | session, |
32ce8569 MD |
593 | session->objd, |
594 | chan->objd, | |
595 | nr_fields, | |
596 | fields, | |
6ca18e66 | 597 | &chan_id, |
32ce8569 | 598 | &chan->header_type); |
b869b5ae MD |
599 | if (ret) { |
600 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 601 | return ret; |
b869b5ae | 602 | } |
6ca18e66 MD |
603 | if (chan_id != chan->id) { |
604 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
605 | chan_id, chan->id); | |
606 | return -EINVAL; | |
607 | } | |
8020ceb5 MD |
608 | } |
609 | ||
ac6b4ac6 | 610 | /* Set atomically the state to "active" */ |
b5234c06 MD |
611 | CMM_ACCESS_ONCE(session->active) = 1; |
612 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 613 | |
710b8ee3 MD |
614 | ret = lttng_session_statedump(session); |
615 | if (ret) | |
616 | return ret; | |
8020ceb5 | 617 | end: |
8020ceb5 MD |
618 | return ret; |
619 | } | |
620 | ||
7dd08bec | 621 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
622 | { |
623 | int ret = 0; | |
624 | ||
8020ceb5 MD |
625 | if (!session->active) { |
626 | ret = -EBUSY; | |
627 | goto end; | |
628 | } | |
ac6b4ac6 | 629 | /* Set atomically the state to "inactive" */ |
b5234c06 | 630 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
631 | |
632 | /* Set transient enabler state to "disabled" */ | |
633 | session->tstate = 0; | |
d5fc3224 | 634 | lttng_session_sync_event_enablers(session); |
8020ceb5 | 635 | end: |
8020ceb5 MD |
636 | return ret; |
637 | } | |
638 | ||
7dd08bec | 639 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 640 | { |
ac6b4ac6 | 641 | int ret = 0; |
976fe9ea | 642 | |
ac6b4ac6 MD |
643 | if (channel->enabled) { |
644 | ret = -EBUSY; | |
645 | goto end; | |
646 | } | |
647 | /* Set transient enabler state to "enabled" */ | |
648 | channel->tstate = 1; | |
d5fc3224 | 649 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
650 | /* Set atomically the state to "enabled" */ |
651 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
652 | end: | |
653 | return ret; | |
976fe9ea MD |
654 | } |
655 | ||
7dd08bec | 656 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 657 | { |
ac6b4ac6 | 658 | int ret = 0; |
976fe9ea | 659 | |
ac6b4ac6 MD |
660 | if (!channel->enabled) { |
661 | ret = -EBUSY; | |
662 | goto end; | |
663 | } | |
664 | /* Set atomically the state to "disabled" */ | |
665 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
666 | /* Set transient enabler state to "enabled" */ | |
667 | channel->tstate = 0; | |
d5fc3224 | 668 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
669 | end: |
670 | return ret; | |
976fe9ea MD |
671 | } |
672 | ||
d5fc3224 FD |
673 | static inline |
674 | struct cds_hlist_head *borrow_hash_table_bucket( | |
675 | struct cds_hlist_head *hash_table, | |
676 | unsigned int hash_table_size, | |
677 | const struct lttng_event_desc *desc) | |
678 | { | |
679 | const char *event_name; | |
680 | size_t name_len; | |
681 | uint32_t hash; | |
682 | ||
683 | event_name = desc->name; | |
684 | name_len = strlen(event_name); | |
685 | ||
686 | hash = jhash(event_name, name_len, 0); | |
687 | return &hash_table[hash & (hash_table_size - 1)]; | |
688 | } | |
689 | ||
8020ceb5 MD |
690 | /* |
691 | * Supports event creation while tracing session is active. | |
692 | */ | |
e58095ef MD |
693 | static |
694 | int lttng_event_create(const struct lttng_event_desc *desc, | |
695 | struct lttng_channel *chan) | |
8020ceb5 | 696 | { |
7dd08bec | 697 | struct lttng_event *event; |
32ce8569 | 698 | struct lttng_session *session = chan->session; |
d56fa719 | 699 | struct cds_hlist_head *head; |
576599a0 | 700 | int ret = 0; |
32ce8569 MD |
701 | int notify_socket, loglevel; |
702 | const char *uri; | |
8020ceb5 | 703 | |
d5fc3224 FD |
704 | head = borrow_hash_table_bucket(chan->session->events_ht.table, |
705 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
457a6b58 | 706 | |
32ce8569 MD |
707 | notify_socket = lttng_get_notify_socket(session->owner); |
708 | if (notify_socket < 0) { | |
709 | ret = notify_socket; | |
710 | goto socket_error; | |
711 | } | |
712 | ||
53569322 MD |
713 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
714 | session); | |
c785c634 MD |
715 | if (ret < 0) { |
716 | DBG("Error (%d) adding enum to session", ret); | |
717 | goto create_enum_error; | |
718 | } | |
719 | ||
457a6b58 MD |
720 | /* |
721 | * Check if loglevel match. Refuse to connect event if not. | |
722 | */ | |
7dd08bec | 723 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
724 | if (!event) { |
725 | ret = -ENOMEM; | |
8020ceb5 | 726 | goto cache_error; |
576599a0 | 727 | } |
8020ceb5 | 728 | event->chan = chan; |
e58095ef | 729 | |
ac6b4ac6 MD |
730 | /* Event will be enabled by enabler sync. */ |
731 | event->enabled = 0; | |
732 | event->registered = 0; | |
e58095ef MD |
733 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
734 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
735 | event->desc = desc; | |
32ce8569 MD |
736 | |
737 | if (desc->loglevel) | |
738 | loglevel = *(*event->desc->loglevel); | |
739 | else | |
740 | loglevel = TRACE_DEFAULT; | |
741 | if (desc->u.ext.model_emf_uri) | |
742 | uri = *(desc->u.ext.model_emf_uri); | |
743 | else | |
744 | uri = NULL; | |
745 | ||
13b21cd6 MD |
746 | /* Fetch event ID from sessiond */ |
747 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 748 | session, |
13b21cd6 MD |
749 | session->objd, |
750 | chan->objd, | |
d5fc3224 | 751 | desc->name, |
13b21cd6 MD |
752 | loglevel, |
753 | desc->signature, | |
754 | desc->nr_fields, | |
755 | desc->fields, | |
756 | uri, | |
757 | &event->id); | |
758 | if (ret < 0) { | |
759 | DBG("Error (%d) registering event to sessiond", ret); | |
760 | goto sessiond_register_error; | |
32ce8569 | 761 | } |
2b213b16 | 762 | |
e58095ef | 763 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 764 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 765 | return 0; |
8020ceb5 | 766 | |
32ce8569 | 767 | sessiond_register_error: |
b5234c06 | 768 | free(event); |
8020ceb5 | 769 | cache_error: |
c785c634 | 770 | create_enum_error: |
32ce8569 | 771 | socket_error: |
576599a0 | 772 | return ret; |
8020ceb5 MD |
773 | } |
774 | ||
d5fc3224 FD |
775 | static |
776 | int lttng_trigger_create(const struct lttng_event_desc *desc, | |
777 | uint64_t id, struct lttng_trigger_group *trigger_group) | |
778 | { | |
779 | struct lttng_trigger *trigger; | |
780 | struct cds_hlist_head *head; | |
781 | int ret = 0; | |
782 | ||
783 | /* | |
784 | * Get the hashtable bucket the created lttng_trigger object should be | |
785 | * inserted. | |
786 | */ | |
787 | head = borrow_hash_table_bucket(trigger_group->triggers_ht.table, | |
788 | LTTNG_UST_TRIGGER_HT_SIZE, desc); | |
789 | ||
790 | trigger = zmalloc(sizeof(struct lttng_trigger)); | |
791 | if (!trigger) { | |
792 | ret = -ENOMEM; | |
793 | goto error; | |
794 | } | |
795 | ||
796 | trigger->group = trigger_group; | |
797 | trigger->id = id; | |
798 | ||
799 | /* Trigger will be enabled by enabler sync. */ | |
800 | trigger->enabled = 0; | |
801 | trigger->registered = 0; | |
802 | ||
803 | CDS_INIT_LIST_HEAD(&trigger->bytecode_runtime_head); | |
804 | CDS_INIT_LIST_HEAD(&trigger->enablers_ref_head); | |
805 | trigger->desc = desc; | |
806 | ||
807 | cds_list_add(&trigger->node, &trigger_group->triggers_head); | |
808 | cds_hlist_add_head(&trigger->hlist, head); | |
809 | ||
810 | return 0; | |
811 | ||
812 | error: | |
813 | return ret; | |
814 | } | |
815 | ||
816 | static | |
817 | void _lttng_trigger_destroy(struct lttng_trigger *trigger) | |
818 | { | |
819 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
820 | ||
821 | /* Remove from trigger list. */ | |
822 | cds_list_del(&trigger->node); | |
823 | /* Remove from trigger hash table. */ | |
824 | cds_hlist_del(&trigger->hlist); | |
825 | ||
826 | lttng_free_trigger_filter_runtime(trigger); | |
827 | ||
828 | /* Free trigger enabler refs */ | |
829 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
830 | &trigger->enablers_ref_head, node) | |
831 | free(enabler_ref); | |
832 | free(trigger); | |
833 | } | |
834 | ||
e58095ef | 835 | static |
196ec2df | 836 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
837 | struct lttng_enabler *enabler) |
838 | { | |
839 | int loglevel = 0; | |
7e2e405c | 840 | unsigned int has_loglevel = 0; |
e58095ef | 841 | |
d5fc3224 | 842 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f6f42e6 MD |
843 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
844 | desc->name, SIZE_MAX)) | |
e58095ef MD |
845 | return 0; |
846 | if (desc->loglevel) { | |
847 | loglevel = *(*desc->loglevel); | |
848 | has_loglevel = 1; | |
849 | } | |
850 | if (!lttng_loglevel_match(loglevel, | |
851 | has_loglevel, | |
852 | enabler->event_param.loglevel_type, | |
853 | enabler->event_param.loglevel)) | |
854 | return 0; | |
855 | return 1; | |
856 | } | |
857 | ||
858 | static | |
859 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
860 | struct lttng_enabler *enabler) | |
861 | { | |
862 | int loglevel = 0; | |
863 | unsigned int has_loglevel = 0; | |
864 | ||
d5fc3224 | 865 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
e58095ef MD |
866 | if (strcmp(desc->name, enabler->event_param.name)) |
867 | return 0; | |
868 | if (desc->loglevel) { | |
869 | loglevel = *(*desc->loglevel); | |
870 | has_loglevel = 1; | |
871 | } | |
872 | if (!lttng_loglevel_match(loglevel, | |
873 | has_loglevel, | |
874 | enabler->event_param.loglevel_type, | |
875 | enabler->event_param.loglevel)) | |
876 | return 0; | |
877 | return 1; | |
878 | } | |
879 | ||
880 | static | |
881 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
882 | struct lttng_enabler *enabler) | |
883 | { | |
d5fc3224 FD |
884 | switch (enabler->format_type) { |
885 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
196ec2df PP |
886 | { |
887 | struct lttng_ust_excluder_node *excluder; | |
888 | ||
889 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
890 | return 0; | |
891 | } | |
892 | ||
893 | /* | |
894 | * If the matching event matches with an excluder, | |
895 | * return 'does not match' | |
896 | */ | |
897 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
898 | int count; | |
899 | ||
900 | for (count = 0; count < excluder->excluder.count; count++) { | |
901 | int len; | |
902 | char *excluder_name; | |
903 | ||
904 | excluder_name = (char *) (excluder->excluder.names) | |
905 | + count * LTTNG_UST_SYM_NAME_LEN; | |
906 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 907 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 908 | return 0; |
ed5b5bbd JI |
909 | } |
910 | } | |
196ec2df | 911 | return 1; |
ed5b5bbd | 912 | } |
d5fc3224 | 913 | case LTTNG_ENABLER_FORMAT_EVENT: |
e58095ef MD |
914 | return lttng_desc_match_event_enabler(desc, enabler); |
915 | default: | |
916 | return -EINVAL; | |
917 | } | |
918 | } | |
919 | ||
920 | static | |
d5fc3224 FD |
921 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
922 | struct lttng_event *event) | |
923 | { | |
924 | if (lttng_desc_match_enabler(event->desc, | |
925 | lttng_event_enabler_as_enabler(event_enabler)) | |
926 | && event->chan == event_enabler->chan) | |
927 | return 1; | |
928 | else | |
929 | return 0; | |
930 | } | |
931 | ||
932 | static | |
933 | int lttng_trigger_enabler_match_trigger( | |
934 | struct lttng_trigger_enabler *trigger_enabler, | |
935 | struct lttng_trigger *trigger) | |
e58095ef | 936 | { |
d5fc3224 FD |
937 | int desc_matches = lttng_desc_match_enabler(trigger->desc, |
938 | lttng_trigger_enabler_as_enabler(trigger_enabler)); | |
939 | ||
940 | if (desc_matches && trigger->group == trigger_enabler->group && | |
941 | trigger->id == trigger_enabler->id) | |
d970f72e MD |
942 | return 1; |
943 | else | |
944 | return 0; | |
e58095ef MD |
945 | } |
946 | ||
947 | static | |
d5fc3224 FD |
948 | struct lttng_enabler_ref *lttng_enabler_ref( |
949 | struct cds_list_head *enabler_ref_list, | |
e58095ef MD |
950 | struct lttng_enabler *enabler) |
951 | { | |
952 | struct lttng_enabler_ref *enabler_ref; | |
953 | ||
d5fc3224 | 954 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
e58095ef MD |
955 | if (enabler_ref->ref == enabler) |
956 | return enabler_ref; | |
957 | } | |
958 | return NULL; | |
959 | } | |
960 | ||
8020ceb5 | 961 | /* |
e58095ef MD |
962 | * Create struct lttng_event if it is missing and present in the list of |
963 | * tracepoint probes. | |
8020ceb5 | 964 | */ |
e58095ef | 965 | static |
d5fc3224 | 966 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 967 | { |
d5fc3224 | 968 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
969 | struct lttng_probe_desc *probe_desc; |
970 | const struct lttng_event_desc *desc; | |
971 | struct lttng_event *event; | |
972 | int i; | |
973 | struct cds_list_head *probe_list; | |
974 | ||
975 | probe_list = lttng_get_probe_list_head(); | |
976 | /* | |
977 | * For each probe event, if we find that a probe event matches | |
978 | * our enabler, create an associated lttng_event if not | |
979 | * already present. | |
980 | */ | |
981 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
982 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
983 | int ret; |
984 | bool found = false; | |
d56fa719 MD |
985 | struct cds_hlist_head *head; |
986 | struct cds_hlist_node *node; | |
e58095ef MD |
987 | |
988 | desc = probe_desc->event_desc[i]; | |
d5fc3224 FD |
989 | if (!lttng_desc_match_enabler(desc, |
990 | lttng_event_enabler_as_enabler(event_enabler))) | |
e58095ef MD |
991 | continue; |
992 | ||
d5fc3224 FD |
993 | head = borrow_hash_table_bucket( |
994 | session->events_ht.table, | |
995 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
996 | ||
d56fa719 | 997 | cds_hlist_for_each_entry(event, node, head, hlist) { |
d970f72e | 998 | if (event->desc == desc |
d5fc3224 | 999 | && event->chan == event_enabler->chan) { |
98a97f24 | 1000 | found = true; |
3140bffe FD |
1001 | break; |
1002 | } | |
e58095ef MD |
1003 | } |
1004 | if (found) | |
1005 | continue; | |
1006 | ||
1007 | /* | |
1008 | * We need to create an event for this | |
1009 | * event probe. | |
1010 | */ | |
1011 | ret = lttng_event_create(probe_desc->event_desc[i], | |
d5fc3224 | 1012 | event_enabler->chan); |
e58095ef | 1013 | if (ret) { |
32ce8569 MD |
1014 | DBG("Unable to create event %s, error %d\n", |
1015 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 1016 | } |
8165c8da | 1017 | } |
8020ceb5 | 1018 | } |
8020ceb5 MD |
1019 | } |
1020 | ||
d5fc3224 FD |
1021 | static |
1022 | void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc, | |
1023 | void (*event_func)(struct lttng_session *session, | |
1024 | struct lttng_event *event), | |
1025 | void (*trigger_func)(struct lttng_trigger *trigger)) | |
35ac38cb FD |
1026 | { |
1027 | struct cds_hlist_node *node, *tmp_node; | |
1028 | struct cds_list_head *sessionsp; | |
d5fc3224 | 1029 | unsigned int i; |
35ac38cb FD |
1030 | |
1031 | /* Get handle on list of sessions. */ | |
1032 | sessionsp = _lttng_get_sessions(); | |
1033 | ||
1034 | /* | |
d5fc3224 FD |
1035 | * Iterate over all events in the probe provider descriptions and |
1036 | * sessions to queue the unregistration of the events. | |
35ac38cb FD |
1037 | */ |
1038 | for (i = 0; i < provider_desc->nr_events; i++) { | |
1039 | const struct lttng_event_desc *event_desc; | |
d5fc3224 FD |
1040 | struct lttng_trigger_group *trigger_group; |
1041 | struct lttng_trigger *trigger; | |
1042 | struct lttng_session *session; | |
1043 | struct cds_hlist_head *head; | |
1044 | struct lttng_event *event; | |
35ac38cb FD |
1045 | |
1046 | event_desc = provider_desc->event_desc[i]; | |
35ac38cb | 1047 | |
d5fc3224 FD |
1048 | /* |
1049 | * Iterate over all session to find the current event | |
1050 | * description. | |
1051 | */ | |
35ac38cb FD |
1052 | cds_list_for_each_entry(session, sessionsp, node) { |
1053 | /* | |
d5fc3224 FD |
1054 | * Get the list of events in the hashtable bucket and |
1055 | * iterate to find the event matching this descriptor. | |
35ac38cb | 1056 | */ |
d5fc3224 FD |
1057 | head = borrow_hash_table_bucket( |
1058 | session->events_ht.table, | |
1059 | LTTNG_UST_EVENT_HT_SIZE, event_desc); | |
1060 | ||
1061 | cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) { | |
35ac38cb | 1062 | if (event_desc == event->desc) { |
d5fc3224 FD |
1063 | event_func(session, event); |
1064 | break; | |
1065 | } | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | /* | |
1070 | * Iterate over all trigger groups to find the current event | |
1071 | * description. | |
1072 | */ | |
1073 | cds_list_for_each_entry(trigger_group, &trigger_groups, node) { | |
1074 | /* | |
1075 | * Get the list of triggers in the hashtable bucket and | |
1076 | * iterate to find the trigger matching this | |
1077 | * descriptor. | |
1078 | */ | |
1079 | head = borrow_hash_table_bucket( | |
1080 | trigger_group->triggers_ht.table, | |
1081 | LTTNG_UST_TRIGGER_HT_SIZE, event_desc); | |
1082 | ||
1083 | cds_hlist_for_each_entry_safe(trigger, node, tmp_node, head, hlist) { | |
1084 | if (event_desc == trigger->desc) { | |
1085 | trigger_func(trigger); | |
35ac38cb FD |
1086 | break; |
1087 | } | |
1088 | } | |
1089 | } | |
1090 | } | |
d5fc3224 FD |
1091 | } |
1092 | ||
1093 | static | |
1094 | void _unregister_event(struct lttng_session *session, | |
1095 | struct lttng_event *event) | |
1096 | { | |
1097 | _lttng_event_unregister(event); | |
1098 | } | |
1099 | ||
1100 | static | |
1101 | void _event_enum_destroy(struct lttng_session *session, | |
1102 | struct lttng_event *event) | |
1103 | { | |
1104 | unsigned int i; | |
1105 | ||
1106 | /* Destroy enums of the current event. */ | |
1107 | for (i = 0; i < event->desc->nr_fields; i++) { | |
1108 | const struct lttng_enum_desc *enum_desc; | |
1109 | const struct lttng_event_field *field; | |
1110 | struct lttng_enum *curr_enum; | |
1111 | ||
1112 | field = &(event->desc->fields[i]); | |
1113 | if (field->type.atype != atype_enum) { | |
1114 | continue; | |
1115 | } | |
1116 | ||
1117 | enum_desc = field->type.u.basic.enumeration.desc; | |
1118 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); | |
1119 | if (curr_enum) { | |
1120 | _lttng_enum_destroy(curr_enum); | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | /* Destroy event. */ | |
1125 | _lttng_event_destroy(event); | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
1130 | * the probe provider descriptor received as argument. Must me called with the | |
1131 | * ust_lock held. | |
1132 | */ | |
1133 | void lttng_probe_provider_unregister_events( | |
1134 | struct lttng_probe_desc *provider_desc) | |
1135 | { | |
1136 | /* | |
1137 | * Iterate over all events in the probe provider descriptions and sessions | |
1138 | * to queue the unregistration of the events. | |
1139 | */ | |
1140 | probe_provider_event_for_each(provider_desc, _unregister_event, | |
1141 | _lttng_trigger_unregister); | |
35ac38cb FD |
1142 | |
1143 | /* Wait for grace period. */ | |
1144 | synchronize_trace(); | |
1145 | /* Prune the unregistration queue. */ | |
1146 | __tracepoint_probe_prune_release_queue(); | |
1147 | ||
1148 | /* | |
1149 | * It is now safe to destroy the events and remove them from the event list | |
1150 | * and hashtables. | |
1151 | */ | |
d5fc3224 FD |
1152 | probe_provider_event_for_each(provider_desc, _event_enum_destroy, |
1153 | _lttng_trigger_destroy); | |
35ac38cb FD |
1154 | } |
1155 | ||
8020ceb5 | 1156 | /* |
d5fc3224 | 1157 | * Create events associated with an event enabler (if not already present), |
e58095ef | 1158 | * and add backward reference from the event to the enabler. |
8020ceb5 MD |
1159 | */ |
1160 | static | |
d5fc3224 | 1161 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1162 | { |
d5fc3224 | 1163 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1164 | struct lttng_event *event; |
1165 | ||
1166 | /* First ensure that probe events are created for this enabler. */ | |
d5fc3224 | 1167 | lttng_create_event_if_missing(event_enabler); |
e58095ef MD |
1168 | |
1169 | /* For each event matching enabler in session event list. */ | |
1170 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1171 | struct lttng_enabler_ref *enabler_ref; | |
1172 | ||
d5fc3224 | 1173 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
e58095ef MD |
1174 | continue; |
1175 | ||
d5fc3224 FD |
1176 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
1177 | lttng_event_enabler_as_enabler(event_enabler)); | |
e58095ef MD |
1178 | if (!enabler_ref) { |
1179 | /* | |
1180 | * If no backward ref, create it. | |
1181 | * Add backward ref from event to enabler. | |
1182 | */ | |
1183 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1184 | if (!enabler_ref) | |
1185 | return -ENOMEM; | |
d5fc3224 | 1186 | enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler); |
e58095ef MD |
1187 | cds_list_add(&enabler_ref->node, |
1188 | &event->enablers_ref_head); | |
8165c8da | 1189 | } |
e58095ef MD |
1190 | |
1191 | /* | |
1192 | * Link filter bytecodes if not linked yet. | |
1193 | */ | |
d5fc3224 FD |
1194 | lttng_enabler_link_bytecode(event->desc, |
1195 | &session->ctx, | |
1196 | &event->bytecode_runtime_head, | |
1197 | lttng_event_enabler_as_enabler(event_enabler)); | |
e58095ef MD |
1198 | |
1199 | /* TODO: merge event context. */ | |
1200 | } | |
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | * Called at library load: connect the probe on all enablers matching | |
1206 | * this event. | |
5f733922 | 1207 | * Called with session mutex held. |
e58095ef | 1208 | */ |
5f733922 | 1209 | int lttng_fix_pending_events(void) |
e58095ef MD |
1210 | { |
1211 | struct lttng_session *session; | |
1212 | ||
1213 | cds_list_for_each_entry(session, &sessions, node) { | |
d5fc3224 FD |
1214 | lttng_session_lazy_sync_event_enablers(session); |
1215 | } | |
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | int lttng_fix_pending_triggers(void) | |
1220 | { | |
1221 | struct lttng_trigger_group *trigger_group; | |
1222 | ||
1223 | cds_list_for_each_entry(trigger_group, &trigger_groups, node) { | |
1224 | lttng_trigger_group_sync_enablers(trigger_group); | |
8020ceb5 | 1225 | } |
e58095ef MD |
1226 | return 0; |
1227 | } | |
1228 | ||
246be17e | 1229 | /* |
37dddb65 MD |
1230 | * For each session of the owner thread, execute pending statedump. |
1231 | * Only dump state for the sessions owned by the caller thread, because | |
1232 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 1233 | */ |
3327ac33 | 1234 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
1235 | { |
1236 | struct lttng_session *session; | |
1237 | ||
37dddb65 | 1238 | /* Execute state dump */ |
cf73e0fe | 1239 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
1240 | |
1241 | /* Clear pending state dump */ | |
3327ac33 MD |
1242 | if (ust_lock()) { |
1243 | goto end; | |
1244 | } | |
246be17e | 1245 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
1246 | if (session->owner != owner) |
1247 | continue; | |
1248 | if (!session->statedump_pending) | |
1249 | continue; | |
1250 | session->statedump_pending = 0; | |
246be17e | 1251 | } |
3327ac33 | 1252 | end: |
37dddb65 | 1253 | ust_unlock(); |
3327ac33 | 1254 | return; |
246be17e PW |
1255 | } |
1256 | ||
e58095ef MD |
1257 | /* |
1258 | * Only used internally at session destruction. | |
1259 | */ | |
1260 | static | |
1261 | void _lttng_event_destroy(struct lttng_event *event) | |
1262 | { | |
1263 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1264 | ||
35ac38cb | 1265 | /* Remove from event list. */ |
e58095ef | 1266 | cds_list_del(&event->node); |
35ac38cb FD |
1267 | /* Remove from event hash table. */ |
1268 | cds_hlist_del(&event->hlist); | |
1269 | ||
8020ceb5 | 1270 | lttng_destroy_context(event->ctx); |
f488575f | 1271 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1272 | /* Free event enabler refs */ |
1273 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1274 | &event->enablers_ref_head, node) | |
1275 | free(enabler_ref); | |
b5234c06 | 1276 | free(event); |
8020ceb5 MD |
1277 | } |
1278 | ||
c785c634 MD |
1279 | static |
1280 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1281 | { | |
1282 | cds_list_del(&_enum->node); | |
35ac38cb | 1283 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1284 | free(_enum); |
1285 | } | |
1286 | ||
003fedf4 | 1287 | void lttng_ust_events_exit(void) |
8020ceb5 | 1288 | { |
7dd08bec | 1289 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1290 | |
e58095ef | 1291 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1292 | lttng_session_destroy(session); |
8020ceb5 | 1293 | } |
457a6b58 | 1294 | |
e58095ef MD |
1295 | /* |
1296 | * Enabler management. | |
1297 | */ | |
d5fc3224 FD |
1298 | struct lttng_event_enabler *lttng_event_enabler_create( |
1299 | enum lttng_enabler_format_type format_type, | |
e58095ef MD |
1300 | struct lttng_ust_event *event_param, |
1301 | struct lttng_channel *chan) | |
457a6b58 | 1302 | { |
d5fc3224 | 1303 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1304 | |
d5fc3224 FD |
1305 | event_enabler = zmalloc(sizeof(*event_enabler)); |
1306 | if (!event_enabler) | |
e58095ef | 1307 | return NULL; |
d5fc3224 FD |
1308 | event_enabler->base.format_type = format_type; |
1309 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1310 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); | |
1311 | memcpy(&event_enabler->base.event_param, event_param, | |
1312 | sizeof(event_enabler->base.event_param)); | |
1313 | event_enabler->chan = chan; | |
e58095ef | 1314 | /* ctx left NULL */ |
d5fc3224 FD |
1315 | event_enabler->base.enabled = 0; |
1316 | cds_list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); | |
1317 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1318 | ||
1319 | return event_enabler; | |
457a6b58 MD |
1320 | } |
1321 | ||
d5fc3224 FD |
1322 | struct lttng_trigger_enabler *lttng_trigger_enabler_create( |
1323 | struct lttng_trigger_group *trigger_group, | |
1324 | enum lttng_enabler_format_type format_type, | |
1325 | struct lttng_ust_trigger *trigger_param) | |
457a6b58 | 1326 | { |
d5fc3224 FD |
1327 | struct lttng_trigger_enabler *trigger_enabler; |
1328 | ||
1329 | trigger_enabler = zmalloc(sizeof(*trigger_enabler)); | |
1330 | if (!trigger_enabler) | |
1331 | return NULL; | |
1332 | trigger_enabler->base.format_type = format_type; | |
1333 | CDS_INIT_LIST_HEAD(&trigger_enabler->base.filter_bytecode_head); | |
1334 | CDS_INIT_LIST_HEAD(&trigger_enabler->base.excluder_head); | |
1335 | ||
1336 | trigger_enabler->id = trigger_param->id; | |
1337 | ||
1338 | memcpy(&trigger_enabler->base.event_param.name, trigger_param->name, | |
1339 | sizeof(trigger_enabler->base.event_param.name)); | |
1340 | trigger_enabler->base.event_param.instrumentation = trigger_param->instrumentation; | |
1341 | trigger_enabler->base.event_param.loglevel = trigger_param->loglevel; | |
1342 | trigger_enabler->base.event_param.loglevel_type = trigger_param->loglevel_type; | |
1343 | ||
1344 | trigger_enabler->base.enabled = 0; | |
1345 | trigger_enabler->group = trigger_group; | |
1346 | ||
1347 | cds_list_add(&trigger_enabler->node, &trigger_group->enablers_head); | |
1348 | ||
1349 | lttng_trigger_group_sync_enablers(trigger_group); | |
1350 | ||
1351 | return trigger_enabler; | |
1352 | } | |
1353 | ||
1354 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) | |
1355 | { | |
1356 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; | |
1357 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1358 | ||
e58095ef | 1359 | return 0; |
457a6b58 | 1360 | } |
457a6b58 | 1361 | |
d5fc3224 | 1362 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1363 | { |
d5fc3224 FD |
1364 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1365 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1366 | ||
e58095ef MD |
1367 | return 0; |
1368 | } | |
457a6b58 | 1369 | |
d5fc3224 FD |
1370 | static |
1371 | void _lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, | |
e58095ef MD |
1372 | struct lttng_ust_filter_bytecode_node *bytecode) |
1373 | { | |
1374 | bytecode->enabler = enabler; | |
1375 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
d5fc3224 FD |
1376 | } |
1377 | ||
1378 | int lttng_event_enabler_attach_bytecode(struct lttng_event_enabler *event_enabler, | |
1379 | struct lttng_ust_filter_bytecode_node *bytecode) | |
1380 | { | |
1381 | _lttng_enabler_attach_bytecode( | |
1382 | lttng_event_enabler_as_enabler(event_enabler), bytecode); | |
1383 | ||
1384 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
e58095ef | 1385 | return 0; |
0bfb5cbd JI |
1386 | } |
1387 | ||
d5fc3224 FD |
1388 | static |
1389 | void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
0bfb5cbd JI |
1390 | struct lttng_ust_excluder_node *excluder) |
1391 | { | |
1392 | excluder->enabler = enabler; | |
1393 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
d5fc3224 FD |
1394 | } |
1395 | ||
1396 | int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler, | |
1397 | struct lttng_ust_excluder_node *excluder) | |
1398 | { | |
1399 | _lttng_enabler_attach_exclusion( | |
1400 | lttng_event_enabler_as_enabler(event_enabler), excluder); | |
1401 | ||
1402 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1403 | return 0; | |
1404 | } | |
1405 | ||
1406 | int lttng_trigger_enabler_enable(struct lttng_trigger_enabler *trigger_enabler) | |
1407 | { | |
1408 | lttng_trigger_enabler_as_enabler(trigger_enabler)->enabled = 1; | |
1409 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
1410 | ||
1411 | return 0; | |
1412 | } | |
1413 | ||
1414 | int lttng_trigger_enabler_disable(struct lttng_trigger_enabler *trigger_enabler) | |
1415 | { | |
1416 | lttng_trigger_enabler_as_enabler(trigger_enabler)->enabled = 0; | |
1417 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
1418 | ||
1419 | return 0; | |
1420 | } | |
1421 | ||
1422 | int lttng_trigger_enabler_attach_bytecode( struct lttng_trigger_enabler *trigger_enabler, | |
1423 | struct lttng_ust_filter_bytecode_node *bytecode) | |
1424 | { | |
1425 | _lttng_enabler_attach_bytecode( | |
1426 | lttng_trigger_enabler_as_enabler(trigger_enabler), bytecode); | |
1427 | ||
1428 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
1429 | return 0; | |
1430 | } | |
1431 | ||
1432 | int lttng_trigger_enabler_attach_exclusion( | |
1433 | struct lttng_trigger_enabler *trigger_enabler, | |
1434 | struct lttng_ust_excluder_node *excluder) | |
1435 | { | |
1436 | _lttng_enabler_attach_exclusion( | |
1437 | lttng_trigger_enabler_as_enabler(trigger_enabler), excluder); | |
1438 | ||
1439 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
0bfb5cbd | 1440 | return 0; |
e58095ef | 1441 | } |
f488575f | 1442 | |
e58095ef | 1443 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1444 | union ust_args *uargs, |
e58095ef MD |
1445 | struct lttng_ctx **ctx, struct lttng_session *session) |
1446 | { | |
457a6b58 | 1447 | /* |
e58095ef MD |
1448 | * We cannot attach a context after trace has been started for a |
1449 | * session because the metadata does not allow expressing this | |
1450 | * information outside of the original channel scope. | |
457a6b58 | 1451 | */ |
e58095ef MD |
1452 | if (session->been_active) |
1453 | return -EPERM; | |
457a6b58 | 1454 | |
e58095ef MD |
1455 | switch (context_param->ctx) { |
1456 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1457 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1458 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1459 | { | |
1460 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1461 | ||
1462 | perf_ctx_param = &context_param->u.perf_counter; | |
1463 | return lttng_add_perf_counter_to_ctx( | |
1464 | perf_ctx_param->type, | |
1465 | perf_ctx_param->config, | |
1466 | perf_ctx_param->name, | |
1467 | ctx); | |
1468 | } | |
e58095ef MD |
1469 | case LTTNG_UST_CONTEXT_VTID: |
1470 | return lttng_add_vtid_to_ctx(ctx); | |
1471 | case LTTNG_UST_CONTEXT_VPID: | |
1472 | return lttng_add_vpid_to_ctx(ctx); | |
1473 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1474 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1475 | case LTTNG_UST_CONTEXT_IP: |
1476 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1477 | case LTTNG_UST_CONTEXT_CPU_ID: |
1478 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1479 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1480 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1481 | ctx); | |
735bef47 MJ |
1482 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1483 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1484 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1485 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1486 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1487 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1488 | case LTTNG_UST_CONTEXT_NET_NS: | |
1489 | return lttng_add_net_ns_to_ctx(ctx); | |
1490 | case LTTNG_UST_CONTEXT_PID_NS: | |
1491 | return lttng_add_pid_ns_to_ctx(ctx); | |
1492 | case LTTNG_UST_CONTEXT_USER_NS: | |
1493 | return lttng_add_user_ns_to_ctx(ctx); | |
1494 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1495 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1496 | case LTTNG_UST_CONTEXT_VUID: |
1497 | return lttng_add_vuid_to_ctx(ctx); | |
1498 | case LTTNG_UST_CONTEXT_VEUID: | |
1499 | return lttng_add_veuid_to_ctx(ctx); | |
1500 | case LTTNG_UST_CONTEXT_VSUID: | |
1501 | return lttng_add_vsuid_to_ctx(ctx); | |
1502 | case LTTNG_UST_CONTEXT_VGID: | |
1503 | return lttng_add_vgid_to_ctx(ctx); | |
1504 | case LTTNG_UST_CONTEXT_VEGID: | |
1505 | return lttng_add_vegid_to_ctx(ctx); | |
1506 | case LTTNG_UST_CONTEXT_VSGID: | |
1507 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1508 | default: |
1509 | return -EINVAL; | |
457a6b58 | 1510 | } |
457a6b58 MD |
1511 | } |
1512 | ||
d5fc3224 | 1513 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
e58095ef | 1514 | struct lttng_ust_context *context_param) |
457a6b58 | 1515 | { |
e58095ef | 1516 | return -ENOSYS; |
457a6b58 MD |
1517 | } |
1518 | ||
d5fc3224 | 1519 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1520 | { |
d5fc3224 FD |
1521 | if (!event_enabler) { |
1522 | return; | |
0f63324a | 1523 | } |
d5fc3224 | 1524 | cds_list_del(&event_enabler->node); |
0f63324a | 1525 | |
d5fc3224 | 1526 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef | 1527 | |
d5fc3224 FD |
1528 | lttng_destroy_context(event_enabler->ctx); |
1529 | free(event_enabler); | |
457a6b58 MD |
1530 | } |
1531 | ||
e58095ef | 1532 | /* |
d5fc3224 | 1533 | * lttng_session_sync_event_enablers should be called just before starting a |
e58095ef MD |
1534 | * session. |
1535 | */ | |
457a6b58 | 1536 | static |
d5fc3224 | 1537 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1538 | { |
d5fc3224 | 1539 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1540 | struct lttng_event *event; |
457a6b58 | 1541 | |
d5fc3224 FD |
1542 | cds_list_for_each_entry(event_enabler, &session->enablers_head, node) |
1543 | lttng_event_enabler_ref_events(event_enabler); | |
e58095ef MD |
1544 | /* |
1545 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1546 | * and its channel and session transient states are enabled, we |
1547 | * enable the event, else we disable it. | |
e58095ef MD |
1548 | */ |
1549 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1550 | struct lttng_enabler_ref *enabler_ref; | |
1551 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1552 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1553 | |
1554 | /* Enable events */ | |
1555 | cds_list_for_each_entry(enabler_ref, | |
1556 | &event->enablers_ref_head, node) { | |
1557 | if (enabler_ref->ref->enabled) { | |
1558 | enabled = 1; | |
1559 | break; | |
1560 | } | |
1561 | } | |
ac6b4ac6 MD |
1562 | /* |
1563 | * Enabled state is based on union of enablers, with | |
1564 | * intesection of session and channel transient enable | |
1565 | * states. | |
1566 | */ | |
1567 | enabled = enabled && session->tstate && event->chan->tstate; | |
1568 | ||
1569 | CMM_STORE_SHARED(event->enabled, enabled); | |
1570 | /* | |
1571 | * Sync tracepoint registration with event enabled | |
1572 | * state. | |
1573 | */ | |
1574 | if (enabled) { | |
1575 | if (!event->registered) | |
1576 | register_event(event); | |
1577 | } else { | |
1578 | if (event->registered) | |
1579 | unregister_event(event); | |
1580 | } | |
457a6b58 | 1581 | |
1f49fc05 | 1582 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1583 | cds_list_for_each_entry(enabler_ref, |
1584 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1585 | if (enabler_ref->ref->enabled |
1586 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1587 | has_enablers_without_bytecode = 1; |
1588 | break; | |
1589 | } | |
1590 | } | |
1591 | event->has_enablers_without_bytecode = | |
1592 | has_enablers_without_bytecode; | |
1593 | ||
e58095ef MD |
1594 | /* Enable filters */ |
1595 | cds_list_for_each_entry(runtime, | |
1596 | &event->bytecode_runtime_head, node) { | |
1597 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
1598 | } |
1599 | } | |
baa1e0bc | 1600 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1601 | } |
1602 | ||
d5fc3224 FD |
1603 | static |
1604 | void lttng_create_trigger_if_missing(struct lttng_trigger_enabler *trigger_enabler) | |
1605 | { | |
1606 | struct lttng_trigger_group *trigger_group = trigger_enabler->group; | |
1607 | struct lttng_probe_desc *probe_desc; | |
1608 | struct cds_list_head *probe_list; | |
1609 | int i; | |
1610 | ||
1611 | probe_list = lttng_get_probe_list_head(); | |
1612 | ||
1613 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1614 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1615 | int ret; | |
1616 | bool found = false; | |
1617 | const struct lttng_event_desc *desc; | |
1618 | struct lttng_trigger *trigger; | |
1619 | struct cds_hlist_head *head; | |
1620 | struct cds_hlist_node *node; | |
1621 | ||
1622 | desc = probe_desc->event_desc[i]; | |
1623 | if (!lttng_desc_match_enabler(desc, | |
1624 | lttng_trigger_enabler_as_enabler(trigger_enabler))) | |
1625 | continue; | |
1626 | ||
1627 | /* | |
1628 | * Given the current trigger group, get the bucket that | |
1629 | * the target trigger would be if it was already | |
1630 | * created. | |
1631 | */ | |
1632 | head = borrow_hash_table_bucket( | |
1633 | trigger_group->triggers_ht.table, | |
1634 | LTTNG_UST_TRIGGER_HT_SIZE, desc); | |
1635 | ||
1636 | cds_hlist_for_each_entry(trigger, node, head, hlist) { | |
1637 | /* | |
1638 | * Check if trigger already exists by checking | |
1639 | * if the trigger and enabler share the same | |
1640 | * description and id. | |
1641 | */ | |
1642 | if (trigger->desc == desc && | |
1643 | trigger->id == trigger_enabler->id) { | |
1644 | found = true; | |
1645 | break; | |
1646 | } | |
1647 | } | |
1648 | ||
1649 | if (found) | |
1650 | continue; | |
1651 | ||
1652 | /* | |
1653 | * We need to create a trigger for this event probe. | |
1654 | */ | |
1655 | ret = lttng_trigger_create(desc, trigger_enabler->id, | |
1656 | trigger_group); | |
1657 | if (ret) { | |
1658 | DBG("Unable to create trigger %s, error %d\n", | |
1659 | probe_desc->event_desc[i]->name, ret); | |
1660 | } | |
1661 | } | |
1662 | } | |
1663 | } | |
1664 | ||
1665 | void lttng_trigger_send_notification(struct lttng_trigger *trigger) | |
1666 | { | |
1667 | /* | |
1668 | * We want this write to be atomic AND non-blocking, meaning that we | |
1669 | * want to write either everything OR nothing. | |
1670 | * According to `pipe(7)`, writes that are smaller that the `PIPE_BUF` | |
1671 | * value must be atomic, so we assert that the message we send is less | |
1672 | * than PIPE_BUF. | |
1673 | */ | |
1674 | struct lttng_ust_trigger_notification notif; | |
1675 | ssize_t ret; | |
1676 | ||
1677 | assert(trigger); | |
1678 | assert(trigger->group); | |
1679 | assert(sizeof(notif) <= PIPE_BUF); | |
1680 | ||
1681 | notif.id = trigger->id; | |
1682 | ||
1683 | ret = patient_write(trigger->group->notification_fd, ¬if, | |
1684 | sizeof(notif)); | |
1685 | if (ret == -1) { | |
1686 | if (errno == EAGAIN) { | |
1687 | DBG("Cannot send trigger notification without blocking: %s", | |
1688 | strerror(errno)); | |
1689 | } else { | |
1690 | DBG("Error to sending trigger notification: %s", | |
1691 | strerror(errno)); | |
1692 | abort(); | |
1693 | } | |
1694 | } | |
1695 | } | |
1696 | ||
1697 | /* | |
1698 | * Create triggers associated with a trigger enabler (if not already present). | |
1699 | */ | |
1700 | static | |
1701 | int lttng_trigger_enabler_ref_triggers(struct lttng_trigger_enabler *trigger_enabler) | |
1702 | { | |
1703 | struct lttng_trigger_group *trigger_group = trigger_enabler->group; | |
1704 | struct lttng_trigger *trigger; | |
1705 | ||
1706 | /* First, ensure that probe triggers are created for this enabler. */ | |
1707 | lttng_create_trigger_if_missing(trigger_enabler); | |
1708 | ||
1709 | /* Link the created trigger with its associated enabler. */ | |
1710 | cds_list_for_each_entry(trigger, &trigger_group->triggers_head, node) { | |
1711 | struct lttng_enabler_ref *enabler_ref; | |
1712 | ||
1713 | if (!lttng_trigger_enabler_match_trigger(trigger_enabler, trigger)) | |
1714 | continue; | |
1715 | ||
1716 | enabler_ref = lttng_enabler_ref(&trigger->enablers_ref_head, | |
1717 | lttng_trigger_enabler_as_enabler(trigger_enabler)); | |
1718 | if (!enabler_ref) { | |
1719 | /* | |
1720 | * If no backward ref, create it. | |
1721 | * Add backward ref from trigger to enabler. | |
1722 | */ | |
1723 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1724 | if (!enabler_ref) | |
1725 | return -ENOMEM; | |
1726 | ||
1727 | enabler_ref->ref = lttng_trigger_enabler_as_enabler( | |
1728 | trigger_enabler); | |
1729 | cds_list_add(&enabler_ref->node, | |
1730 | &trigger->enablers_ref_head); | |
1731 | } | |
1732 | ||
1733 | /* | |
1734 | * Link filter bytecodes if not linked yet. | |
1735 | */ | |
1736 | lttng_enabler_link_bytecode(trigger->desc, | |
1737 | &trigger_group->ctx, &trigger->bytecode_runtime_head, | |
1738 | lttng_trigger_enabler_as_enabler(trigger_enabler)); | |
1739 | } | |
1740 | return 0; | |
1741 | } | |
1742 | ||
1743 | static | |
1744 | void lttng_trigger_group_sync_enablers(struct lttng_trigger_group *trigger_group) | |
1745 | { | |
1746 | struct lttng_trigger_enabler *trigger_enabler; | |
1747 | struct lttng_trigger *trigger; | |
1748 | ||
1749 | cds_list_for_each_entry(trigger_enabler, &trigger_group->enablers_head, node) { | |
1750 | /* | |
1751 | * Only link enablers that are enabled to triggers, the user | |
1752 | * might still be attaching filter or exclusion to the | |
1753 | * trigger_enabler. | |
1754 | */ | |
1755 | if (!lttng_trigger_enabler_as_enabler(trigger_enabler)->enabled) | |
1756 | continue; | |
1757 | ||
1758 | lttng_trigger_enabler_ref_triggers(trigger_enabler); | |
1759 | } | |
1760 | ||
1761 | /* | |
1762 | * For each trigger, if at least one of its enablers is enabled, | |
1763 | * we enable the trigger, else we disable it. | |
1764 | */ | |
1765 | cds_list_for_each_entry(trigger, &trigger_group->triggers_head, node) { | |
1766 | struct lttng_enabler_ref *enabler_ref; | |
1767 | struct lttng_bytecode_runtime *runtime; | |
1768 | int enabled = 0, has_enablers_without_bytecode = 0; | |
1769 | ||
1770 | /* Enable triggers */ | |
1771 | cds_list_for_each_entry(enabler_ref, | |
1772 | &trigger->enablers_ref_head, node) { | |
1773 | if (enabler_ref->ref->enabled) { | |
1774 | enabled = 1; | |
1775 | break; | |
1776 | } | |
1777 | } | |
1778 | ||
1779 | CMM_STORE_SHARED(trigger->enabled, enabled); | |
1780 | /* | |
1781 | * Sync tracepoint registration with trigger enabled | |
1782 | * state. | |
1783 | */ | |
1784 | if (enabled) { | |
1785 | if (!trigger->registered) | |
1786 | register_trigger(trigger); | |
1787 | } else { | |
1788 | if (trigger->registered) | |
1789 | unregister_trigger(trigger); | |
1790 | } | |
1791 | ||
1792 | /* Check if has enablers without bytecode enabled */ | |
1793 | cds_list_for_each_entry(enabler_ref, | |
1794 | &trigger->enablers_ref_head, node) { | |
1795 | if (enabler_ref->ref->enabled | |
1796 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1797 | has_enablers_without_bytecode = 1; | |
1798 | break; | |
1799 | } | |
1800 | } | |
1801 | trigger->has_enablers_without_bytecode = | |
1802 | has_enablers_without_bytecode; | |
1803 | ||
1804 | /* Enable filters */ | |
1805 | cds_list_for_each_entry(runtime, | |
1806 | &trigger->bytecode_runtime_head, node) { | |
1807 | lttng_filter_sync_state(runtime); | |
1808 | } | |
1809 | } | |
1810 | __tracepoint_probe_prune_release_queue(); | |
1811 | } | |
1812 | ||
e58095ef MD |
1813 | /* |
1814 | * Apply enablers to session events, adding events to session if need | |
1815 | * be. It is required after each modification applied to an active | |
1816 | * session, and right before session "start". | |
1817 | * "lazy" sync means we only sync if required. | |
1818 | */ | |
1819 | static | |
d5fc3224 | 1820 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1821 | { |
e58095ef MD |
1822 | /* We can skip if session is not active */ |
1823 | if (!session->active) | |
1824 | return; | |
d5fc3224 | 1825 | lttng_session_sync_event_enablers(session); |
457a6b58 | 1826 | } |
53569322 MD |
1827 | |
1828 | /* | |
1829 | * Update all sessions with the given app context. | |
1830 | * Called with ust lock held. | |
1831 | * This is invoked when an application context gets loaded/unloaded. It | |
1832 | * ensures the context callbacks are in sync with the application | |
1833 | * context (either app context callbacks, or dummy callbacks). | |
1834 | */ | |
1835 | void lttng_ust_context_set_session_provider(const char *name, | |
1836 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1837 | void (*record)(struct lttng_ctx_field *field, | |
1838 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1839 | struct lttng_channel *chan), | |
1840 | void (*get_value)(struct lttng_ctx_field *field, | |
1841 | struct lttng_ctx_value *value)) | |
1842 | { | |
1843 | struct lttng_session *session; | |
1844 | ||
1845 | cds_list_for_each_entry(session, &sessions, node) { | |
1846 | struct lttng_channel *chan; | |
1847 | struct lttng_event *event; | |
1848 | int ret; | |
1849 | ||
1850 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1851 | name, get_size, record, get_value); | |
1852 | if (ret) | |
1853 | abort(); | |
1854 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1855 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1856 | name, get_size, record, get_value); | |
1857 | if (ret) | |
1858 | abort(); | |
1859 | } | |
1860 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1861 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1862 | name, get_size, record, get_value); | |
1863 | if (ret) | |
1864 | abort(); | |
1865 | } | |
1866 | } | |
1867 | } | |
d5fc3224 FD |
1868 | |
1869 | /* | |
1870 | * Update all trigger groups with the given app context. | |
1871 | * Called with ust lock held. | |
1872 | * This is invoked when an application context gets loaded/unloaded. It | |
1873 | * ensures the context callbacks are in sync with the application | |
1874 | * context (either app context callbacks, or dummy callbacks). | |
1875 | */ | |
1876 | void lttng_ust_context_set_trigger_group_provider(const char *name, | |
1877 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1878 | void (*record)(struct lttng_ctx_field *field, | |
1879 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1880 | struct lttng_channel *chan), | |
1881 | void (*get_value)(struct lttng_ctx_field *field, | |
1882 | struct lttng_ctx_value *value)) | |
1883 | { | |
1884 | struct lttng_trigger_group *trigger_group; | |
1885 | ||
1886 | cds_list_for_each_entry(trigger_group, &trigger_groups, node) { | |
1887 | int ret; | |
1888 | ||
1889 | ret = lttng_ust_context_set_provider_rcu(&trigger_group->ctx, | |
1890 | name, get_size, record, get_value); | |
1891 | if (ret) | |
1892 | abort(); | |
1893 | } | |
1894 | } |