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> |
cb11f03a | 26 | #include <assert.h> |
b5234c06 | 27 | #include <errno.h> |
cb11f03a 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> |
cb11f03a | 37 | #include <unistd.h> |
2ae57758 | 38 | #include <lttng/ust-endian.h> |
44c72f10 MD |
39 | |
40 | #include <urcu-bp.h> | |
cb11f03a | 41 | #include <urcu/arch.h> |
44c72f10 | 42 | #include <urcu/compiler.h> |
cb11f03a 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> |
cb11f03a | 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" |
cb11f03a | 63 | #include "lttng-bytecode.h" |
7dd08bec MD |
64 | #include "lttng-tracer.h" |
65 | #include "lttng-tracer-core.h" | |
cf73e0fe | 66 | #include "lttng-ust-statedump.h" |
cb11f03a FD |
67 | #include "context-internal.h" |
68 | #include "ust-events-internal.h" | |
b728d87e | 69 | #include "wait.h" |
8d8a24c8 | 70 | #include "../libringbuffer/shm.h" |
596c4223 | 71 | #include "jhash.h" |
cb11f03a | 72 | #include <lttng/ust-abi.h> |
8165c8da MD |
73 | |
74 | /* | |
3327ac33 MD |
75 | * All operations within this file are called by the communication |
76 | * thread, under ust_lock protection. | |
8165c8da | 77 | */ |
8165c8da | 78 | |
b5234c06 | 79 | static CDS_LIST_HEAD(sessions); |
cb11f03a | 80 | static CDS_LIST_HEAD(trigger_groups); |
8165c8da | 81 | |
37dddb65 MD |
82 | struct cds_list_head *_lttng_get_sessions(void) |
83 | { | |
84 | return &sessions; | |
85 | } | |
86 | ||
7dd08bec | 87 | static void _lttng_event_destroy(struct lttng_event *event); |
cb11f03a | 88 | static void _lttng_trigger_destroy(struct lttng_trigger *trigger); |
c785c634 | 89 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 90 | |
e58095ef | 91 | static |
cb11f03a FD |
92 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
93 | static | |
94 | void lttng_session_sync_event_enablers(struct lttng_session *session); | |
e58095ef | 95 | static |
cb11f03a | 96 | void lttng_trigger_group_sync_enablers(struct lttng_trigger_group *trigger_group); |
e58095ef MD |
97 | static |
98 | void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
99 | ||
6715d7d1 MD |
100 | /* |
101 | * Called with ust lock held. | |
102 | */ | |
103 | int lttng_session_active(void) | |
104 | { | |
105 | struct lttng_session *iter; | |
106 | ||
107 | cds_list_for_each_entry(iter, &sessions, node) { | |
108 | if (iter->active) | |
109 | return 1; | |
110 | } | |
111 | return 0; | |
112 | } | |
113 | ||
e58095ef MD |
114 | static |
115 | int lttng_loglevel_match(int loglevel, | |
116 | unsigned int has_loglevel, | |
457a6b58 MD |
117 | enum lttng_ust_loglevel_type req_type, |
118 | int req_loglevel) | |
119 | { | |
e58095ef MD |
120 | if (!has_loglevel) |
121 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
122 | switch (req_type) { |
123 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 124 | if (loglevel <= req_loglevel |
67ada458 | 125 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
126 | return 1; |
127 | else | |
128 | return 0; | |
129 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 130 | if (loglevel == req_loglevel |
67ada458 | 131 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
132 | return 1; |
133 | else | |
134 | return 0; | |
135 | case LTTNG_UST_LOGLEVEL_ALL: | |
136 | default: | |
67ada458 | 137 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
138 | return 1; |
139 | else | |
140 | return 0; | |
457a6b58 MD |
141 | } |
142 | } | |
143 | ||
8020ceb5 MD |
144 | void synchronize_trace(void) |
145 | { | |
8020ceb5 | 146 | synchronize_rcu(); |
8020ceb5 MD |
147 | } |
148 | ||
7dd08bec | 149 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 150 | { |
7dd08bec | 151 | struct lttng_session *session; |
74d81a6c | 152 | int i; |
8020ceb5 | 153 | |
7dd08bec | 154 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
155 | if (!session) |
156 | return NULL; | |
cb11f03a | 157 | if (lttng_context_init_all(&session->ctx)) { |
53569322 MD |
158 | free(session); |
159 | return NULL; | |
160 | } | |
e58095ef MD |
161 | CDS_INIT_LIST_HEAD(&session->chan_head); |
162 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 163 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 164 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
165 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
166 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
167 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
168 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 169 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
170 | return session; |
171 | } | |
172 | ||
cb11f03a FD |
173 | struct lttng_trigger_group *lttng_trigger_group_create(void) |
174 | { | |
175 | struct lttng_trigger_group *trigger_group; | |
176 | int i; | |
177 | ||
178 | trigger_group = zmalloc(sizeof(struct lttng_trigger_group)); | |
179 | if (!trigger_group) | |
180 | return NULL; | |
181 | ||
182 | /* Add all contexts. */ | |
183 | if (lttng_context_init_all(&trigger_group->ctx)) { | |
184 | free(trigger_group); | |
185 | return NULL; | |
186 | } | |
187 | ||
188 | CDS_INIT_LIST_HEAD(&trigger_group->enablers_head); | |
189 | CDS_INIT_LIST_HEAD(&trigger_group->triggers_head); | |
190 | for (i = 0; i < LTTNG_UST_TRIGGER_HT_SIZE; i++) | |
191 | CDS_INIT_HLIST_HEAD(&trigger_group->triggers_ht.table[i]); | |
192 | ||
193 | cds_list_add(&trigger_group->node, &trigger_groups); | |
194 | ||
195 | return trigger_group; | |
196 | } | |
197 | ||
74d81a6c MD |
198 | /* |
199 | * Only used internally at session destruction. | |
200 | */ | |
201 | static | |
202 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
203 | { | |
204 | struct channel *chan; | |
205 | struct lttng_ust_shm_handle *handle; | |
206 | ||
207 | cds_list_del(<tng_chan->node); | |
208 | lttng_destroy_context(lttng_chan->ctx); | |
209 | chan = lttng_chan->chan; | |
210 | handle = lttng_chan->handle; | |
211 | /* | |
212 | * note: lttng_chan is private data contained within handle. It | |
213 | * will be freed along with the handle. | |
214 | */ | |
215 | channel_destroy(chan, handle, 0); | |
216 | } | |
217 | ||
ac6b4ac6 MD |
218 | static |
219 | void register_event(struct lttng_event *event) | |
220 | { | |
221 | int ret; | |
222 | const struct lttng_event_desc *desc; | |
223 | ||
224 | assert(event->registered == 0); | |
225 | desc = event->desc; | |
baa1e0bc | 226 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
227 | desc->probe_callback, |
228 | event, desc->signature); | |
229 | WARN_ON_ONCE(ret); | |
230 | if (!ret) | |
231 | event->registered = 1; | |
232 | } | |
233 | ||
cb11f03a FD |
234 | static |
235 | void register_trigger(struct lttng_trigger *trigger) | |
236 | { | |
237 | int ret; | |
238 | const struct lttng_event_desc *desc; | |
239 | ||
240 | assert(trigger->registered == 0); | |
241 | desc = trigger->desc; | |
242 | ret = __tracepoint_probe_register_queue_release(desc->name, | |
243 | desc->u.ext.trigger_callback, trigger, desc->signature); | |
244 | WARN_ON_ONCE(ret); | |
245 | if (!ret) | |
246 | trigger->registered = 1; | |
247 | } | |
248 | ||
ac6b4ac6 MD |
249 | static |
250 | void unregister_event(struct lttng_event *event) | |
251 | { | |
252 | int ret; | |
253 | const struct lttng_event_desc *desc; | |
254 | ||
255 | assert(event->registered == 1); | |
256 | desc = event->desc; | |
baa1e0bc | 257 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
258 | desc->probe_callback, |
259 | event); | |
260 | WARN_ON_ONCE(ret); | |
261 | if (!ret) | |
262 | event->registered = 0; | |
263 | } | |
264 | ||
cb11f03a FD |
265 | static |
266 | void unregister_trigger(struct lttng_trigger *trigger) | |
267 | { | |
268 | int ret; | |
269 | const struct lttng_event_desc *desc; | |
270 | ||
271 | assert(trigger->registered == 1); | |
272 | desc = trigger->desc; | |
273 | ret = __tracepoint_probe_unregister_queue_release(desc->name, | |
274 | desc->u.ext.trigger_callback, trigger); | |
275 | WARN_ON_ONCE(ret); | |
276 | if (!ret) | |
277 | trigger->registered = 0; | |
278 | } | |
279 | ||
ac6b4ac6 MD |
280 | /* |
281 | * Only used internally at session destruction. | |
282 | */ | |
283 | static | |
284 | void _lttng_event_unregister(struct lttng_event *event) | |
285 | { | |
286 | if (event->registered) | |
287 | unregister_event(event); | |
288 | } | |
289 | ||
cb11f03a FD |
290 | /* |
291 | * Only used internally at session destruction. | |
292 | */ | |
293 | static | |
294 | void _lttng_trigger_unregister(struct lttng_trigger *trigger) | |
295 | { | |
296 | if (trigger->registered) | |
297 | unregister_trigger(trigger); | |
298 | } | |
299 | ||
7dd08bec | 300 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 301 | { |
7dd08bec MD |
302 | struct lttng_channel *chan, *tmpchan; |
303 | struct lttng_event *event, *tmpevent; | |
c785c634 | 304 | struct lttng_enum *_enum, *tmp_enum; |
cb11f03a | 305 | struct lttng_event_enabler *event_enabler, *event_tmpenabler; |
8020ceb5 | 306 | |
b5234c06 | 307 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 308 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 309 | _lttng_event_unregister(event); |
8020ceb5 MD |
310 | } |
311 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
baa1e0bc | 312 | __tracepoint_probe_prune_release_queue(); |
cb11f03a | 313 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
e58095ef | 314 | &session->enablers_head, node) |
cb11f03a | 315 | lttng_event_enabler_destroy(event_enabler); |
e58095ef MD |
316 | cds_list_for_each_entry_safe(event, tmpevent, |
317 | &session->events_head, node) | |
7dd08bec | 318 | _lttng_event_destroy(event); |
c785c634 MD |
319 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
320 | &session->enums_head, node) | |
321 | _lttng_enum_destroy(_enum); | |
e58095ef | 322 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 323 | _lttng_channel_unmap(chan); |
e58095ef | 324 | cds_list_del(&session->node); |
53569322 | 325 | lttng_destroy_context(session->ctx); |
b5234c06 | 326 | free(session); |
8020ceb5 MD |
327 | } |
328 | ||
cb11f03a FD |
329 | void lttng_trigger_group_destroy( |
330 | struct lttng_trigger_group *trigger_group) | |
331 | { | |
332 | int close_ret; | |
333 | struct lttng_trigger_enabler *trigger_enabler, *tmptrigger_enabler; | |
334 | struct lttng_trigger *trigger, *tmptrigger; | |
335 | ||
336 | if (!trigger_group) { | |
337 | return; | |
338 | } | |
339 | ||
340 | cds_list_for_each_entry(trigger, &trigger_group->triggers_head, node) | |
341 | _lttng_trigger_unregister(trigger); | |
342 | ||
343 | synchronize_trace(); | |
344 | ||
345 | cds_list_for_each_entry_safe(trigger_enabler, tmptrigger_enabler, | |
346 | &trigger_group->enablers_head, node) | |
347 | lttng_trigger_enabler_destroy(trigger_enabler); | |
348 | ||
349 | cds_list_for_each_entry_safe(trigger, tmptrigger, | |
350 | &trigger_group->triggers_head, node) | |
351 | _lttng_trigger_destroy(trigger); | |
352 | ||
353 | /* Close the notification fd to the listener of triggers. */ | |
354 | ||
355 | lttng_ust_lock_fd_tracker(); | |
356 | close_ret = close(trigger_group->notification_fd); | |
357 | if (!close_ret) { | |
358 | lttng_ust_delete_fd_from_tracker(trigger_group->notification_fd); | |
359 | } else { | |
360 | PERROR("close"); | |
361 | abort(); | |
362 | } | |
363 | lttng_ust_unlock_fd_tracker(); | |
364 | ||
365 | cds_list_del(&trigger_group->node); | |
366 | ||
367 | free(trigger_group); | |
368 | } | |
369 | ||
370 | static | |
371 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
372 | { | |
373 | struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node; | |
374 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; | |
375 | ||
376 | if (!enabler) { | |
377 | return; | |
378 | } | |
379 | ||
380 | /* Destroy filter bytecode */ | |
381 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
382 | &enabler->filter_bytecode_head, node) { | |
383 | free(filter_node); | |
384 | } | |
385 | ||
386 | /* Destroy excluders */ | |
387 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
388 | &enabler->excluder_head, node) { | |
389 | free(excluder_node); | |
390 | } | |
391 | } | |
392 | ||
393 | void lttng_trigger_enabler_destroy(struct lttng_trigger_enabler *trigger_enabler) | |
394 | { | |
395 | if (!trigger_enabler) { | |
396 | return; | |
397 | } | |
398 | ||
399 | cds_list_del(&trigger_enabler->node); | |
400 | ||
401 | lttng_enabler_destroy(lttng_trigger_enabler_as_enabler(trigger_enabler)); | |
402 | ||
403 | free(trigger_enabler); | |
404 | } | |
405 | ||
53569322 MD |
406 | static |
407 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
408 | struct lttng_session *session) | |
409 | { | |
410 | const char *enum_name = desc->name; | |
411 | struct lttng_enum *_enum; | |
412 | struct cds_hlist_head *head; | |
53569322 MD |
413 | int ret = 0; |
414 | size_t name_len = strlen(enum_name); | |
415 | uint32_t hash; | |
416 | int notify_socket; | |
417 | ||
b33b46f7 | 418 | /* Check if this enum is already registered for this session. */ |
53569322 MD |
419 | hash = jhash(enum_name, name_len, 0); |
420 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
b33b46f7 FD |
421 | |
422 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
423 | if (_enum) { | |
424 | ret = -EEXIST; | |
425 | goto exist; | |
53569322 MD |
426 | } |
427 | ||
428 | notify_socket = lttng_get_notify_socket(session->owner); | |
429 | if (notify_socket < 0) { | |
430 | ret = notify_socket; | |
431 | goto socket_error; | |
432 | } | |
433 | ||
434 | _enum = zmalloc(sizeof(*_enum)); | |
435 | if (!_enum) { | |
436 | ret = -ENOMEM; | |
437 | goto cache_error; | |
438 | } | |
439 | _enum->session = session; | |
440 | _enum->desc = desc; | |
441 | ||
442 | ret = ustcomm_register_enum(notify_socket, | |
443 | session->objd, | |
444 | enum_name, | |
445 | desc->nr_entries, | |
446 | desc->entries, | |
447 | &_enum->id); | |
448 | if (ret < 0) { | |
449 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
450 | goto sessiond_register_error; | |
451 | } | |
452 | cds_list_add(&_enum->node, &session->enums_head); | |
453 | cds_hlist_add_head(&_enum->hlist, head); | |
454 | return 0; | |
455 | ||
456 | sessiond_register_error: | |
457 | free(_enum); | |
458 | cache_error: | |
459 | socket_error: | |
460 | exist: | |
461 | return ret; | |
462 | } | |
463 | ||
464 | static | |
465 | int lttng_create_enum_check(const struct lttng_type *type, | |
466 | struct lttng_session *session) | |
467 | { | |
468 | switch (type->atype) { | |
469 | case atype_enum: | |
470 | { | |
471 | const struct lttng_enum_desc *enum_desc; | |
472 | int ret; | |
473 | ||
218deb69 MD |
474 | enum_desc = type->u.legacy.basic.enumeration.desc; |
475 | ret = lttng_enum_create(enum_desc, session); | |
476 | if (ret && ret != -EEXIST) { | |
477 | DBG("Unable to create enum error: (%d)", ret); | |
478 | return ret; | |
479 | } | |
480 | break; | |
481 | } | |
482 | case atype_enum_nestable: | |
483 | { | |
484 | const struct lttng_enum_desc *enum_desc; | |
485 | int ret; | |
486 | ||
487 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
488 | ret = lttng_enum_create(enum_desc, session); |
489 | if (ret && ret != -EEXIST) { | |
490 | DBG("Unable to create enum error: (%d)", ret); | |
491 | return ret; | |
492 | } | |
493 | break; | |
494 | } | |
495 | case atype_dynamic: | |
496 | { | |
497 | const struct lttng_event_field *tag_field_generic; | |
498 | const struct lttng_enum_desc *enum_desc; | |
499 | int ret; | |
500 | ||
501 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 502 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
503 | ret = lttng_enum_create(enum_desc, session); |
504 | if (ret && ret != -EEXIST) { | |
505 | DBG("Unable to create enum error: (%d)", ret); | |
506 | return ret; | |
507 | } | |
508 | break; | |
509 | } | |
510 | default: | |
511 | /* TODO: nested types when they become supported. */ | |
512 | break; | |
513 | } | |
514 | return 0; | |
515 | } | |
516 | ||
517 | static | |
518 | int lttng_create_all_event_enums(size_t nr_fields, | |
519 | const struct lttng_event_field *event_fields, | |
520 | struct lttng_session *session) | |
521 | { | |
522 | size_t i; | |
523 | int ret; | |
524 | ||
525 | /* For each field, ensure enum is part of the session. */ | |
526 | for (i = 0; i < nr_fields; i++) { | |
527 | const struct lttng_type *type = &event_fields[i].type; | |
528 | ||
529 | ret = lttng_create_enum_check(type, session); | |
530 | if (ret) | |
531 | return ret; | |
532 | } | |
533 | return 0; | |
534 | } | |
535 | ||
536 | static | |
537 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
538 | const struct lttng_ctx_field *ctx_fields, | |
539 | struct lttng_session *session) | |
540 | { | |
541 | size_t i; | |
542 | int ret; | |
543 | ||
544 | /* For each field, ensure enum is part of the session. */ | |
545 | for (i = 0; i < nr_fields; i++) { | |
546 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
547 | ||
548 | ret = lttng_create_enum_check(type, session); | |
549 | if (ret) | |
550 | return ret; | |
551 | } | |
552 | return 0; | |
553 | } | |
554 | ||
710b8ee3 MD |
555 | /* |
556 | * Ensure that a state-dump will be performed for this session at the end | |
557 | * of the current handle_message(). | |
558 | */ | |
559 | int lttng_session_statedump(struct lttng_session *session) | |
560 | { | |
561 | session->statedump_pending = 1; | |
562 | lttng_ust_sockinfo_session_enabled(session->owner); | |
563 | return 0; | |
564 | } | |
53569322 | 565 | |
7dd08bec | 566 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
567 | { |
568 | int ret = 0; | |
7dd08bec | 569 | struct lttng_channel *chan; |
32ce8569 | 570 | int notify_socket; |
8020ceb5 | 571 | |
8020ceb5 MD |
572 | if (session->active) { |
573 | ret = -EBUSY; | |
574 | goto end; | |
575 | } | |
576 | ||
32ce8569 MD |
577 | notify_socket = lttng_get_notify_socket(session->owner); |
578 | if (notify_socket < 0) | |
579 | return notify_socket; | |
580 | ||
ac6b4ac6 MD |
581 | /* Set transient enabler state to "enabled" */ |
582 | session->tstate = 1; | |
e58095ef | 583 | |
3ff7660f | 584 | /* We need to sync enablers with session before activation. */ |
cb11f03a | 585 | lttng_session_sync_event_enablers(session); |
3ff7660f | 586 | |
8020ceb5 MD |
587 | /* |
588 | * Snapshot the number of events per channel to know the type of header | |
589 | * we need to use. | |
590 | */ | |
e58095ef | 591 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 592 | const struct lttng_ctx *ctx; |
83e43212 | 593 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 594 | size_t nr_fields = 0; |
6ca18e66 | 595 | uint32_t chan_id; |
32ce8569 MD |
596 | |
597 | /* don't change it if session stop/restart */ | |
8020ceb5 | 598 | if (chan->header_type) |
32ce8569 MD |
599 | continue; |
600 | ctx = chan->ctx; | |
601 | if (ctx) { | |
602 | nr_fields = ctx->nr_fields; | |
83e43212 | 603 | fields = ctx->fields; |
53569322 MD |
604 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
605 | session); | |
606 | if (ret < 0) { | |
607 | DBG("Error (%d) adding enum to session", ret); | |
608 | return ret; | |
609 | } | |
32ce8569 MD |
610 | } |
611 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 612 | session, |
32ce8569 MD |
613 | session->objd, |
614 | chan->objd, | |
615 | nr_fields, | |
616 | fields, | |
6ca18e66 | 617 | &chan_id, |
32ce8569 | 618 | &chan->header_type); |
b869b5ae MD |
619 | if (ret) { |
620 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 621 | return ret; |
b869b5ae | 622 | } |
6ca18e66 MD |
623 | if (chan_id != chan->id) { |
624 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
625 | chan_id, chan->id); | |
626 | return -EINVAL; | |
627 | } | |
8020ceb5 MD |
628 | } |
629 | ||
ac6b4ac6 | 630 | /* Set atomically the state to "active" */ |
b5234c06 MD |
631 | CMM_ACCESS_ONCE(session->active) = 1; |
632 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 633 | |
710b8ee3 MD |
634 | ret = lttng_session_statedump(session); |
635 | if (ret) | |
636 | return ret; | |
8020ceb5 | 637 | end: |
8020ceb5 MD |
638 | return ret; |
639 | } | |
640 | ||
7dd08bec | 641 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
642 | { |
643 | int ret = 0; | |
644 | ||
8020ceb5 MD |
645 | if (!session->active) { |
646 | ret = -EBUSY; | |
647 | goto end; | |
648 | } | |
ac6b4ac6 | 649 | /* Set atomically the state to "inactive" */ |
b5234c06 | 650 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
651 | |
652 | /* Set transient enabler state to "disabled" */ | |
653 | session->tstate = 0; | |
cb11f03a | 654 | lttng_session_sync_event_enablers(session); |
8020ceb5 | 655 | end: |
8020ceb5 MD |
656 | return ret; |
657 | } | |
658 | ||
7dd08bec | 659 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 660 | { |
ac6b4ac6 | 661 | int ret = 0; |
976fe9ea | 662 | |
ac6b4ac6 MD |
663 | if (channel->enabled) { |
664 | ret = -EBUSY; | |
665 | goto end; | |
666 | } | |
667 | /* Set transient enabler state to "enabled" */ | |
668 | channel->tstate = 1; | |
cb11f03a | 669 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
670 | /* Set atomically the state to "enabled" */ |
671 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
672 | end: | |
673 | return ret; | |
976fe9ea MD |
674 | } |
675 | ||
7dd08bec | 676 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 677 | { |
ac6b4ac6 | 678 | int ret = 0; |
976fe9ea | 679 | |
ac6b4ac6 MD |
680 | if (!channel->enabled) { |
681 | ret = -EBUSY; | |
682 | goto end; | |
683 | } | |
684 | /* Set atomically the state to "disabled" */ | |
685 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
686 | /* Set transient enabler state to "enabled" */ | |
687 | channel->tstate = 0; | |
cb11f03a | 688 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
689 | end: |
690 | return ret; | |
976fe9ea MD |
691 | } |
692 | ||
cb11f03a FD |
693 | static inline |
694 | struct cds_hlist_head *borrow_hash_table_bucket( | |
695 | struct cds_hlist_head *hash_table, | |
696 | unsigned int hash_table_size, | |
697 | const struct lttng_event_desc *desc) | |
698 | { | |
699 | const char *event_name; | |
700 | size_t name_len; | |
701 | uint32_t hash; | |
702 | ||
703 | event_name = desc->name; | |
704 | name_len = strlen(event_name); | |
705 | ||
706 | hash = jhash(event_name, name_len, 0); | |
707 | return &hash_table[hash & (hash_table_size - 1)]; | |
708 | } | |
709 | ||
8020ceb5 MD |
710 | /* |
711 | * Supports event creation while tracing session is active. | |
712 | */ | |
e58095ef MD |
713 | static |
714 | int lttng_event_create(const struct lttng_event_desc *desc, | |
715 | struct lttng_channel *chan) | |
8020ceb5 | 716 | { |
7dd08bec | 717 | struct lttng_event *event; |
32ce8569 | 718 | struct lttng_session *session = chan->session; |
d56fa719 | 719 | struct cds_hlist_head *head; |
576599a0 | 720 | int ret = 0; |
32ce8569 MD |
721 | int notify_socket, loglevel; |
722 | const char *uri; | |
8020ceb5 | 723 | |
cb11f03a FD |
724 | head = borrow_hash_table_bucket(chan->session->events_ht.table, |
725 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
457a6b58 | 726 | |
32ce8569 MD |
727 | notify_socket = lttng_get_notify_socket(session->owner); |
728 | if (notify_socket < 0) { | |
729 | ret = notify_socket; | |
730 | goto socket_error; | |
731 | } | |
732 | ||
53569322 MD |
733 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
734 | session); | |
c785c634 MD |
735 | if (ret < 0) { |
736 | DBG("Error (%d) adding enum to session", ret); | |
737 | goto create_enum_error; | |
738 | } | |
739 | ||
457a6b58 MD |
740 | /* |
741 | * Check if loglevel match. Refuse to connect event if not. | |
742 | */ | |
7dd08bec | 743 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
744 | if (!event) { |
745 | ret = -ENOMEM; | |
8020ceb5 | 746 | goto cache_error; |
576599a0 | 747 | } |
8020ceb5 | 748 | event->chan = chan; |
e58095ef | 749 | |
ac6b4ac6 MD |
750 | /* Event will be enabled by enabler sync. */ |
751 | event->enabled = 0; | |
752 | event->registered = 0; | |
cb11f03a | 753 | CDS_INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
e58095ef MD |
754 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); |
755 | event->desc = desc; | |
32ce8569 MD |
756 | |
757 | if (desc->loglevel) | |
758 | loglevel = *(*event->desc->loglevel); | |
759 | else | |
760 | loglevel = TRACE_DEFAULT; | |
761 | if (desc->u.ext.model_emf_uri) | |
762 | uri = *(desc->u.ext.model_emf_uri); | |
763 | else | |
764 | uri = NULL; | |
765 | ||
13b21cd6 MD |
766 | /* Fetch event ID from sessiond */ |
767 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 768 | session, |
13b21cd6 MD |
769 | session->objd, |
770 | chan->objd, | |
cb11f03a | 771 | desc->name, |
13b21cd6 MD |
772 | loglevel, |
773 | desc->signature, | |
774 | desc->nr_fields, | |
775 | desc->fields, | |
776 | uri, | |
777 | &event->id); | |
778 | if (ret < 0) { | |
779 | DBG("Error (%d) registering event to sessiond", ret); | |
780 | goto sessiond_register_error; | |
32ce8569 | 781 | } |
2b213b16 | 782 | |
e58095ef | 783 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 784 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 785 | return 0; |
8020ceb5 | 786 | |
32ce8569 | 787 | sessiond_register_error: |
b5234c06 | 788 | free(event); |
8020ceb5 | 789 | cache_error: |
c785c634 | 790 | create_enum_error: |
32ce8569 | 791 | socket_error: |
576599a0 | 792 | return ret; |
8020ceb5 MD |
793 | } |
794 | ||
cb11f03a FD |
795 | static |
796 | int lttng_trigger_create(const struct lttng_event_desc *desc, | |
797 | uint64_t id, struct lttng_trigger_group *trigger_group) | |
798 | { | |
799 | struct lttng_trigger *trigger; | |
800 | struct cds_hlist_head *head; | |
801 | int ret = 0; | |
802 | ||
803 | /* | |
804 | * Get the hashtable bucket the created lttng_trigger object should be | |
805 | * inserted. | |
806 | */ | |
807 | head = borrow_hash_table_bucket(trigger_group->triggers_ht.table, | |
808 | LTTNG_UST_TRIGGER_HT_SIZE, desc); | |
809 | ||
810 | trigger = zmalloc(sizeof(struct lttng_trigger)); | |
811 | if (!trigger) { | |
812 | ret = -ENOMEM; | |
813 | goto error; | |
814 | } | |
815 | ||
816 | trigger->group = trigger_group; | |
817 | trigger->id = id; | |
818 | ||
819 | /* Trigger will be enabled by enabler sync. */ | |
820 | trigger->enabled = 0; | |
821 | trigger->registered = 0; | |
822 | ||
823 | CDS_INIT_LIST_HEAD(&trigger->filter_bytecode_runtime_head); | |
824 | CDS_INIT_LIST_HEAD(&trigger->capture_bytecode_runtime_head); | |
825 | CDS_INIT_LIST_HEAD(&trigger->enablers_ref_head); | |
826 | trigger->desc = desc; | |
827 | ||
828 | cds_list_add(&trigger->node, &trigger_group->triggers_head); | |
829 | cds_hlist_add_head(&trigger->hlist, head); | |
830 | ||
831 | return 0; | |
832 | ||
833 | error: | |
834 | return ret; | |
835 | } | |
836 | ||
837 | static | |
838 | void _lttng_trigger_destroy(struct lttng_trigger *trigger) | |
839 | { | |
840 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
841 | ||
842 | /* Remove from trigger list. */ | |
843 | cds_list_del(&trigger->node); | |
844 | /* Remove from trigger hash table. */ | |
845 | cds_hlist_del(&trigger->hlist); | |
846 | ||
847 | lttng_free_trigger_filter_runtime(trigger); | |
848 | ||
849 | /* Free trigger enabler refs */ | |
850 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
851 | &trigger->enablers_ref_head, node) | |
852 | free(enabler_ref); | |
853 | free(trigger); | |
854 | } | |
855 | ||
e58095ef | 856 | static |
196ec2df | 857 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
858 | struct lttng_enabler *enabler) |
859 | { | |
860 | int loglevel = 0; | |
7e2e405c | 861 | unsigned int has_loglevel = 0; |
e58095ef | 862 | |
cb11f03a | 863 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f6f42e6 MD |
864 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
865 | desc->name, SIZE_MAX)) | |
e58095ef MD |
866 | return 0; |
867 | if (desc->loglevel) { | |
868 | loglevel = *(*desc->loglevel); | |
869 | has_loglevel = 1; | |
870 | } | |
871 | if (!lttng_loglevel_match(loglevel, | |
872 | has_loglevel, | |
873 | enabler->event_param.loglevel_type, | |
874 | enabler->event_param.loglevel)) | |
875 | return 0; | |
876 | return 1; | |
877 | } | |
878 | ||
879 | static | |
880 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
881 | struct lttng_enabler *enabler) | |
882 | { | |
883 | int loglevel = 0; | |
884 | unsigned int has_loglevel = 0; | |
885 | ||
cb11f03a | 886 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
e58095ef MD |
887 | if (strcmp(desc->name, enabler->event_param.name)) |
888 | return 0; | |
889 | if (desc->loglevel) { | |
890 | loglevel = *(*desc->loglevel); | |
891 | has_loglevel = 1; | |
892 | } | |
893 | if (!lttng_loglevel_match(loglevel, | |
894 | has_loglevel, | |
895 | enabler->event_param.loglevel_type, | |
896 | enabler->event_param.loglevel)) | |
897 | return 0; | |
898 | return 1; | |
899 | } | |
900 | ||
901 | static | |
902 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
903 | struct lttng_enabler *enabler) | |
904 | { | |
cb11f03a FD |
905 | switch (enabler->format_type) { |
906 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
196ec2df PP |
907 | { |
908 | struct lttng_ust_excluder_node *excluder; | |
909 | ||
910 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
911 | return 0; | |
912 | } | |
913 | ||
914 | /* | |
915 | * If the matching event matches with an excluder, | |
916 | * return 'does not match' | |
917 | */ | |
918 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
919 | int count; | |
920 | ||
921 | for (count = 0; count < excluder->excluder.count; count++) { | |
922 | int len; | |
923 | char *excluder_name; | |
924 | ||
925 | excluder_name = (char *) (excluder->excluder.names) | |
926 | + count * LTTNG_UST_SYM_NAME_LEN; | |
927 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 928 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 929 | return 0; |
ed5b5bbd JI |
930 | } |
931 | } | |
196ec2df | 932 | return 1; |
ed5b5bbd | 933 | } |
cb11f03a | 934 | case LTTNG_ENABLER_FORMAT_EVENT: |
e58095ef MD |
935 | return lttng_desc_match_event_enabler(desc, enabler); |
936 | default: | |
937 | return -EINVAL; | |
938 | } | |
939 | } | |
940 | ||
941 | static | |
cb11f03a FD |
942 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
943 | struct lttng_event *event) | |
944 | { | |
945 | if (lttng_desc_match_enabler(event->desc, | |
946 | lttng_event_enabler_as_enabler(event_enabler)) | |
947 | && event->chan == event_enabler->chan) | |
948 | return 1; | |
949 | else | |
950 | return 0; | |
951 | } | |
952 | ||
953 | static | |
954 | int lttng_trigger_enabler_match_trigger( | |
955 | struct lttng_trigger_enabler *trigger_enabler, | |
956 | struct lttng_trigger *trigger) | |
e58095ef | 957 | { |
cb11f03a FD |
958 | int desc_matches = lttng_desc_match_enabler(trigger->desc, |
959 | lttng_trigger_enabler_as_enabler(trigger_enabler)); | |
960 | ||
961 | if (desc_matches && trigger->group == trigger_enabler->group && | |
962 | trigger->id == trigger_enabler->id) | |
d970f72e MD |
963 | return 1; |
964 | else | |
965 | return 0; | |
e58095ef MD |
966 | } |
967 | ||
968 | static | |
cb11f03a FD |
969 | struct lttng_enabler_ref *lttng_enabler_ref( |
970 | struct cds_list_head *enabler_ref_list, | |
e58095ef MD |
971 | struct lttng_enabler *enabler) |
972 | { | |
973 | struct lttng_enabler_ref *enabler_ref; | |
974 | ||
cb11f03a | 975 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
e58095ef MD |
976 | if (enabler_ref->ref == enabler) |
977 | return enabler_ref; | |
978 | } | |
979 | return NULL; | |
980 | } | |
981 | ||
8020ceb5 | 982 | /* |
e58095ef MD |
983 | * Create struct lttng_event if it is missing and present in the list of |
984 | * tracepoint probes. | |
8020ceb5 | 985 | */ |
e58095ef | 986 | static |
cb11f03a | 987 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 988 | { |
cb11f03a | 989 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
990 | struct lttng_probe_desc *probe_desc; |
991 | const struct lttng_event_desc *desc; | |
992 | struct lttng_event *event; | |
993 | int i; | |
994 | struct cds_list_head *probe_list; | |
995 | ||
996 | probe_list = lttng_get_probe_list_head(); | |
997 | /* | |
998 | * For each probe event, if we find that a probe event matches | |
999 | * our enabler, create an associated lttng_event if not | |
1000 | * already present. | |
1001 | */ | |
1002 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1003 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
1004 | int ret; |
1005 | bool found = false; | |
d56fa719 MD |
1006 | struct cds_hlist_head *head; |
1007 | struct cds_hlist_node *node; | |
e58095ef MD |
1008 | |
1009 | desc = probe_desc->event_desc[i]; | |
cb11f03a FD |
1010 | if (!lttng_desc_match_enabler(desc, |
1011 | lttng_event_enabler_as_enabler(event_enabler))) | |
e58095ef MD |
1012 | continue; |
1013 | ||
cb11f03a FD |
1014 | head = borrow_hash_table_bucket( |
1015 | session->events_ht.table, | |
1016 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
1017 | ||
d56fa719 | 1018 | cds_hlist_for_each_entry(event, node, head, hlist) { |
d970f72e | 1019 | if (event->desc == desc |
cb11f03a | 1020 | && event->chan == event_enabler->chan) { |
98a97f24 | 1021 | found = true; |
3140bffe FD |
1022 | break; |
1023 | } | |
e58095ef MD |
1024 | } |
1025 | if (found) | |
1026 | continue; | |
1027 | ||
1028 | /* | |
1029 | * We need to create an event for this | |
1030 | * event probe. | |
1031 | */ | |
1032 | ret = lttng_event_create(probe_desc->event_desc[i], | |
cb11f03a | 1033 | event_enabler->chan); |
e58095ef | 1034 | if (ret) { |
32ce8569 MD |
1035 | DBG("Unable to create event %s, error %d\n", |
1036 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 1037 | } |
8165c8da | 1038 | } |
8020ceb5 | 1039 | } |
8020ceb5 MD |
1040 | } |
1041 | ||
cb11f03a FD |
1042 | static |
1043 | void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc, | |
1044 | void (*event_func)(struct lttng_session *session, | |
1045 | struct lttng_event *event), | |
1046 | void (*trigger_func)(struct lttng_trigger *trigger)) | |
35ac38cb FD |
1047 | { |
1048 | struct cds_hlist_node *node, *tmp_node; | |
1049 | struct cds_list_head *sessionsp; | |
cb11f03a | 1050 | unsigned int i; |
35ac38cb FD |
1051 | |
1052 | /* Get handle on list of sessions. */ | |
1053 | sessionsp = _lttng_get_sessions(); | |
1054 | ||
1055 | /* | |
cb11f03a FD |
1056 | * Iterate over all events in the probe provider descriptions and |
1057 | * sessions to queue the unregistration of the events. | |
35ac38cb FD |
1058 | */ |
1059 | for (i = 0; i < provider_desc->nr_events; i++) { | |
1060 | const struct lttng_event_desc *event_desc; | |
cb11f03a FD |
1061 | struct lttng_trigger_group *trigger_group; |
1062 | struct lttng_trigger *trigger; | |
1063 | struct lttng_session *session; | |
1064 | struct cds_hlist_head *head; | |
1065 | struct lttng_event *event; | |
35ac38cb FD |
1066 | |
1067 | event_desc = provider_desc->event_desc[i]; | |
35ac38cb | 1068 | |
cb11f03a FD |
1069 | /* |
1070 | * Iterate over all session to find the current event | |
1071 | * description. | |
1072 | */ | |
35ac38cb FD |
1073 | cds_list_for_each_entry(session, sessionsp, node) { |
1074 | /* | |
cb11f03a FD |
1075 | * Get the list of events in the hashtable bucket and |
1076 | * iterate to find the event matching this descriptor. | |
35ac38cb | 1077 | */ |
cb11f03a FD |
1078 | head = borrow_hash_table_bucket( |
1079 | session->events_ht.table, | |
1080 | LTTNG_UST_EVENT_HT_SIZE, event_desc); | |
1081 | ||
1082 | cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) { | |
35ac38cb | 1083 | if (event_desc == event->desc) { |
cb11f03a FD |
1084 | event_func(session, event); |
1085 | break; | |
1086 | } | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * Iterate over all trigger groups to find the current event | |
1092 | * description. | |
1093 | */ | |
1094 | cds_list_for_each_entry(trigger_group, &trigger_groups, node) { | |
1095 | /* | |
1096 | * Get the list of triggers in the hashtable bucket and | |
1097 | * iterate to find the trigger matching this | |
1098 | * descriptor. | |
1099 | */ | |
1100 | head = borrow_hash_table_bucket( | |
1101 | trigger_group->triggers_ht.table, | |
1102 | LTTNG_UST_TRIGGER_HT_SIZE, event_desc); | |
1103 | ||
1104 | cds_hlist_for_each_entry_safe(trigger, node, tmp_node, head, hlist) { | |
1105 | if (event_desc == trigger->desc) { | |
1106 | trigger_func(trigger); | |
35ac38cb FD |
1107 | break; |
1108 | } | |
1109 | } | |
1110 | } | |
1111 | } | |
cb11f03a FD |
1112 | } |
1113 | ||
1114 | static | |
1115 | void _unregister_event(struct lttng_session *session, | |
1116 | struct lttng_event *event) | |
1117 | { | |
1118 | _lttng_event_unregister(event); | |
1119 | } | |
1120 | ||
1121 | static | |
1122 | void _event_enum_destroy(struct lttng_session *session, | |
1123 | struct lttng_event *event) | |
1124 | { | |
1125 | unsigned int i; | |
1126 | ||
1127 | /* Destroy enums of the current event. */ | |
1128 | for (i = 0; i < event->desc->nr_fields; i++) { | |
1129 | const struct lttng_enum_desc *enum_desc; | |
1130 | const struct lttng_event_field *field; | |
1131 | struct lttng_enum *curr_enum; | |
1132 | ||
1133 | field = &(event->desc->fields[i]); | |
1134 | switch (field->type.atype) { | |
1135 | case atype_enum: | |
1136 | enum_desc = field->type.u.legacy.basic.enumeration.desc; | |
1137 | break; | |
1138 | case atype_enum_nestable: | |
1139 | enum_desc = field->type.u.enum_nestable.desc; | |
1140 | break; | |
1141 | default: | |
1142 | continue; | |
1143 | } | |
1144 | ||
1145 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); | |
1146 | if (curr_enum) { | |
1147 | _lttng_enum_destroy(curr_enum); | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | /* Destroy event. */ | |
1152 | _lttng_event_destroy(event); | |
1153 | } | |
1154 | ||
1155 | /* | |
1156 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
1157 | * the probe provider descriptor received as argument. Must me called with the | |
1158 | * ust_lock held. | |
1159 | */ | |
1160 | void lttng_probe_provider_unregister_events( | |
1161 | struct lttng_probe_desc *provider_desc) | |
1162 | { | |
1163 | /* | |
1164 | * Iterate over all events in the probe provider descriptions and sessions | |
1165 | * to queue the unregistration of the events. | |
1166 | */ | |
1167 | probe_provider_event_for_each(provider_desc, _unregister_event, | |
1168 | _lttng_trigger_unregister); | |
35ac38cb FD |
1169 | |
1170 | /* Wait for grace period. */ | |
1171 | synchronize_trace(); | |
1172 | /* Prune the unregistration queue. */ | |
1173 | __tracepoint_probe_prune_release_queue(); | |
1174 | ||
1175 | /* | |
1176 | * It is now safe to destroy the events and remove them from the event list | |
1177 | * and hashtables. | |
1178 | */ | |
cb11f03a FD |
1179 | probe_provider_event_for_each(provider_desc, _event_enum_destroy, |
1180 | _lttng_trigger_destroy); | |
35ac38cb FD |
1181 | } |
1182 | ||
8020ceb5 | 1183 | /* |
cb11f03a | 1184 | * Create events associated with an event enabler (if not already present), |
e58095ef | 1185 | * and add backward reference from the event to the enabler. |
8020ceb5 MD |
1186 | */ |
1187 | static | |
cb11f03a | 1188 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1189 | { |
cb11f03a | 1190 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1191 | struct lttng_event *event; |
1192 | ||
cb11f03a | 1193 | if (!lttng_event_enabler_as_enabler(event_enabler)->enabled) |
de713d8a FD |
1194 | goto end; |
1195 | ||
e58095ef | 1196 | /* First ensure that probe events are created for this enabler. */ |
cb11f03a | 1197 | lttng_create_event_if_missing(event_enabler); |
e58095ef MD |
1198 | |
1199 | /* For each event matching enabler in session event list. */ | |
1200 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1201 | struct lttng_enabler_ref *enabler_ref; | |
1202 | ||
cb11f03a | 1203 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
e58095ef MD |
1204 | continue; |
1205 | ||
cb11f03a FD |
1206 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
1207 | lttng_event_enabler_as_enabler(event_enabler)); | |
e58095ef MD |
1208 | if (!enabler_ref) { |
1209 | /* | |
1210 | * If no backward ref, create it. | |
1211 | * Add backward ref from event to enabler. | |
1212 | */ | |
1213 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1214 | if (!enabler_ref) | |
1215 | return -ENOMEM; | |
cb11f03a FD |
1216 | enabler_ref->ref = lttng_event_enabler_as_enabler( |
1217 | event_enabler); | |
e58095ef MD |
1218 | cds_list_add(&enabler_ref->node, |
1219 | &event->enablers_ref_head); | |
8165c8da | 1220 | } |
e58095ef MD |
1221 | |
1222 | /* | |
1223 | * Link filter bytecodes if not linked yet. | |
1224 | */ | |
cb11f03a FD |
1225 | lttng_enabler_link_bytecode(event->desc, |
1226 | &session->ctx, | |
1227 | &event->filter_bytecode_runtime_head, | |
1228 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); | |
e58095ef MD |
1229 | |
1230 | /* TODO: merge event context. */ | |
1231 | } | |
de713d8a | 1232 | end: |
e58095ef MD |
1233 | return 0; |
1234 | } | |
1235 | ||
1236 | /* | |
1237 | * Called at library load: connect the probe on all enablers matching | |
1238 | * this event. | |
5f733922 | 1239 | * Called with session mutex held. |
e58095ef | 1240 | */ |
5f733922 | 1241 | int lttng_fix_pending_events(void) |
e58095ef MD |
1242 | { |
1243 | struct lttng_session *session; | |
1244 | ||
1245 | cds_list_for_each_entry(session, &sessions, node) { | |
cb11f03a FD |
1246 | lttng_session_lazy_sync_event_enablers(session); |
1247 | } | |
1248 | return 0; | |
1249 | } | |
1250 | ||
1251 | int lttng_fix_pending_triggers(void) | |
1252 | { | |
1253 | struct lttng_trigger_group *trigger_group; | |
1254 | ||
1255 | cds_list_for_each_entry(trigger_group, &trigger_groups, node) { | |
1256 | lttng_trigger_group_sync_enablers(trigger_group); | |
8020ceb5 | 1257 | } |
e58095ef MD |
1258 | return 0; |
1259 | } | |
1260 | ||
246be17e | 1261 | /* |
37dddb65 MD |
1262 | * For each session of the owner thread, execute pending statedump. |
1263 | * Only dump state for the sessions owned by the caller thread, because | |
1264 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 1265 | */ |
3327ac33 | 1266 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
1267 | { |
1268 | struct lttng_session *session; | |
1269 | ||
37dddb65 | 1270 | /* Execute state dump */ |
cf73e0fe | 1271 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
1272 | |
1273 | /* Clear pending state dump */ | |
3327ac33 MD |
1274 | if (ust_lock()) { |
1275 | goto end; | |
1276 | } | |
246be17e | 1277 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
1278 | if (session->owner != owner) |
1279 | continue; | |
1280 | if (!session->statedump_pending) | |
1281 | continue; | |
1282 | session->statedump_pending = 0; | |
246be17e | 1283 | } |
3327ac33 | 1284 | end: |
37dddb65 | 1285 | ust_unlock(); |
3327ac33 | 1286 | return; |
246be17e PW |
1287 | } |
1288 | ||
e58095ef MD |
1289 | /* |
1290 | * Only used internally at session destruction. | |
1291 | */ | |
1292 | static | |
1293 | void _lttng_event_destroy(struct lttng_event *event) | |
1294 | { | |
1295 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1296 | ||
35ac38cb | 1297 | /* Remove from event list. */ |
e58095ef | 1298 | cds_list_del(&event->node); |
35ac38cb FD |
1299 | /* Remove from event hash table. */ |
1300 | cds_hlist_del(&event->hlist); | |
1301 | ||
8020ceb5 | 1302 | lttng_destroy_context(event->ctx); |
f488575f | 1303 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1304 | /* Free event enabler refs */ |
1305 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1306 | &event->enablers_ref_head, node) | |
1307 | free(enabler_ref); | |
b5234c06 | 1308 | free(event); |
8020ceb5 MD |
1309 | } |
1310 | ||
c785c634 MD |
1311 | static |
1312 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1313 | { | |
1314 | cds_list_del(&_enum->node); | |
35ac38cb | 1315 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1316 | free(_enum); |
1317 | } | |
1318 | ||
003fedf4 | 1319 | void lttng_ust_events_exit(void) |
8020ceb5 | 1320 | { |
7dd08bec | 1321 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1322 | |
e58095ef | 1323 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1324 | lttng_session_destroy(session); |
8020ceb5 | 1325 | } |
457a6b58 | 1326 | |
e58095ef MD |
1327 | /* |
1328 | * Enabler management. | |
1329 | */ | |
cb11f03a FD |
1330 | struct lttng_event_enabler *lttng_event_enabler_create( |
1331 | enum lttng_enabler_format_type format_type, | |
e58095ef MD |
1332 | struct lttng_ust_event *event_param, |
1333 | struct lttng_channel *chan) | |
457a6b58 | 1334 | { |
cb11f03a | 1335 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1336 | |
cb11f03a FD |
1337 | event_enabler = zmalloc(sizeof(*event_enabler)); |
1338 | if (!event_enabler) | |
e58095ef | 1339 | return NULL; |
cb11f03a FD |
1340 | event_enabler->base.format_type = format_type; |
1341 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1342 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); | |
1343 | memcpy(&event_enabler->base.event_param, event_param, | |
1344 | sizeof(event_enabler->base.event_param)); | |
1345 | event_enabler->chan = chan; | |
e58095ef | 1346 | /* ctx left NULL */ |
cb11f03a FD |
1347 | event_enabler->base.enabled = 0; |
1348 | cds_list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); | |
1349 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1350 | ||
1351 | return event_enabler; | |
457a6b58 MD |
1352 | } |
1353 | ||
cb11f03a FD |
1354 | struct lttng_trigger_enabler *lttng_trigger_enabler_create( |
1355 | struct lttng_trigger_group *trigger_group, | |
1356 | enum lttng_enabler_format_type format_type, | |
1357 | struct lttng_ust_trigger *trigger_param) | |
457a6b58 | 1358 | { |
cb11f03a FD |
1359 | struct lttng_trigger_enabler *trigger_enabler; |
1360 | ||
1361 | trigger_enabler = zmalloc(sizeof(*trigger_enabler)); | |
1362 | if (!trigger_enabler) | |
1363 | return NULL; | |
1364 | trigger_enabler->base.format_type = format_type; | |
1365 | CDS_INIT_LIST_HEAD(&trigger_enabler->base.filter_bytecode_head); | |
1366 | CDS_INIT_LIST_HEAD(&trigger_enabler->capture_bytecode_head); | |
1367 | CDS_INIT_LIST_HEAD(&trigger_enabler->base.excluder_head); | |
1368 | ||
1369 | trigger_enabler->id = trigger_param->id; | |
1370 | trigger_enabler->num_captures = 0; | |
1371 | ||
1372 | memcpy(&trigger_enabler->base.event_param.name, trigger_param->name, | |
1373 | sizeof(trigger_enabler->base.event_param.name)); | |
1374 | trigger_enabler->base.event_param.instrumentation = trigger_param->instrumentation; | |
1375 | trigger_enabler->base.event_param.loglevel = trigger_param->loglevel; | |
1376 | trigger_enabler->base.event_param.loglevel_type = trigger_param->loglevel_type; | |
1377 | ||
1378 | trigger_enabler->base.enabled = 0; | |
1379 | trigger_enabler->group = trigger_group; | |
1380 | ||
1381 | cds_list_add(&trigger_enabler->node, &trigger_group->enablers_head); | |
1382 | ||
1383 | lttng_trigger_group_sync_enablers(trigger_group); | |
1384 | ||
1385 | return trigger_enabler; | |
1386 | } | |
1387 | ||
1388 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) | |
1389 | { | |
1390 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; | |
1391 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1392 | ||
e58095ef | 1393 | return 0; |
457a6b58 | 1394 | } |
457a6b58 | 1395 | |
cb11f03a | 1396 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1397 | { |
cb11f03a FD |
1398 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1399 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1400 | ||
e58095ef MD |
1401 | return 0; |
1402 | } | |
457a6b58 | 1403 | |
cb11f03a FD |
1404 | static |
1405 | void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, | |
1406 | struct lttng_ust_bytecode_node *bytecode) | |
e58095ef MD |
1407 | { |
1408 | bytecode->enabler = enabler; | |
1409 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
cb11f03a FD |
1410 | } |
1411 | ||
1412 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, | |
1413 | struct lttng_ust_bytecode_node *bytecode) | |
1414 | { | |
1415 | _lttng_enabler_attach_filter_bytecode( | |
1416 | lttng_event_enabler_as_enabler(event_enabler), bytecode); | |
1417 | ||
1418 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
e58095ef | 1419 | return 0; |
0bfb5cbd JI |
1420 | } |
1421 | ||
cb11f03a FD |
1422 | static |
1423 | void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
0bfb5cbd JI |
1424 | struct lttng_ust_excluder_node *excluder) |
1425 | { | |
1426 | excluder->enabler = enabler; | |
1427 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
cb11f03a FD |
1428 | } |
1429 | ||
1430 | int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler, | |
1431 | struct lttng_ust_excluder_node *excluder) | |
1432 | { | |
1433 | _lttng_enabler_attach_exclusion( | |
1434 | lttng_event_enabler_as_enabler(event_enabler), excluder); | |
1435 | ||
1436 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1437 | return 0; | |
1438 | } | |
1439 | ||
1440 | int lttng_trigger_enabler_enable(struct lttng_trigger_enabler *trigger_enabler) | |
1441 | { | |
1442 | lttng_trigger_enabler_as_enabler(trigger_enabler)->enabled = 1; | |
1443 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
1444 | ||
1445 | return 0; | |
1446 | } | |
1447 | ||
1448 | int lttng_trigger_enabler_disable(struct lttng_trigger_enabler *trigger_enabler) | |
1449 | { | |
1450 | lttng_trigger_enabler_as_enabler(trigger_enabler)->enabled = 0; | |
1451 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
1452 | ||
1453 | return 0; | |
1454 | } | |
1455 | ||
1456 | int lttng_trigger_enabler_attach_filter_bytecode( | |
1457 | struct lttng_trigger_enabler *trigger_enabler, | |
1458 | struct lttng_ust_bytecode_node *bytecode) | |
1459 | { | |
1460 | _lttng_enabler_attach_filter_bytecode( | |
1461 | lttng_trigger_enabler_as_enabler(trigger_enabler), bytecode); | |
1462 | ||
1463 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
1464 | return 0; | |
1465 | } | |
1466 | ||
1467 | int lttng_trigger_enabler_attach_capture_bytecode( | |
1468 | struct lttng_trigger_enabler *trigger_enabler, | |
1469 | struct lttng_ust_bytecode_node *bytecode) | |
1470 | { | |
1471 | bytecode->enabler = lttng_trigger_enabler_as_enabler(trigger_enabler); | |
1472 | cds_list_add_tail(&bytecode->node, &trigger_enabler->capture_bytecode_head); | |
1473 | trigger_enabler->num_captures++; | |
1474 | ||
1475 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
1476 | return 0; | |
1477 | } | |
1478 | ||
1479 | int lttng_trigger_enabler_attach_exclusion( | |
1480 | struct lttng_trigger_enabler *trigger_enabler, | |
1481 | struct lttng_ust_excluder_node *excluder) | |
1482 | { | |
1483 | _lttng_enabler_attach_exclusion( | |
1484 | lttng_trigger_enabler_as_enabler(trigger_enabler), excluder); | |
1485 | ||
1486 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
0bfb5cbd | 1487 | return 0; |
e58095ef | 1488 | } |
f488575f | 1489 | |
e58095ef | 1490 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1491 | union ust_args *uargs, |
e58095ef MD |
1492 | struct lttng_ctx **ctx, struct lttng_session *session) |
1493 | { | |
457a6b58 | 1494 | /* |
e58095ef MD |
1495 | * We cannot attach a context after trace has been started for a |
1496 | * session because the metadata does not allow expressing this | |
1497 | * information outside of the original channel scope. | |
457a6b58 | 1498 | */ |
e58095ef MD |
1499 | if (session->been_active) |
1500 | return -EPERM; | |
457a6b58 | 1501 | |
e58095ef MD |
1502 | switch (context_param->ctx) { |
1503 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1504 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1505 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1506 | { | |
1507 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1508 | ||
1509 | perf_ctx_param = &context_param->u.perf_counter; | |
1510 | return lttng_add_perf_counter_to_ctx( | |
1511 | perf_ctx_param->type, | |
1512 | perf_ctx_param->config, | |
1513 | perf_ctx_param->name, | |
1514 | ctx); | |
1515 | } | |
e58095ef MD |
1516 | case LTTNG_UST_CONTEXT_VTID: |
1517 | return lttng_add_vtid_to_ctx(ctx); | |
1518 | case LTTNG_UST_CONTEXT_VPID: | |
1519 | return lttng_add_vpid_to_ctx(ctx); | |
1520 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1521 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1522 | case LTTNG_UST_CONTEXT_IP: |
1523 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1524 | case LTTNG_UST_CONTEXT_CPU_ID: |
1525 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1526 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1527 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1528 | ctx); | |
735bef47 MJ |
1529 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1530 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1531 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1532 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1533 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1534 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1535 | case LTTNG_UST_CONTEXT_NET_NS: | |
1536 | return lttng_add_net_ns_to_ctx(ctx); | |
1537 | case LTTNG_UST_CONTEXT_PID_NS: | |
1538 | return lttng_add_pid_ns_to_ctx(ctx); | |
1539 | case LTTNG_UST_CONTEXT_USER_NS: | |
1540 | return lttng_add_user_ns_to_ctx(ctx); | |
1541 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1542 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1543 | case LTTNG_UST_CONTEXT_VUID: |
1544 | return lttng_add_vuid_to_ctx(ctx); | |
1545 | case LTTNG_UST_CONTEXT_VEUID: | |
1546 | return lttng_add_veuid_to_ctx(ctx); | |
1547 | case LTTNG_UST_CONTEXT_VSUID: | |
1548 | return lttng_add_vsuid_to_ctx(ctx); | |
1549 | case LTTNG_UST_CONTEXT_VGID: | |
1550 | return lttng_add_vgid_to_ctx(ctx); | |
1551 | case LTTNG_UST_CONTEXT_VEGID: | |
1552 | return lttng_add_vegid_to_ctx(ctx); | |
1553 | case LTTNG_UST_CONTEXT_VSGID: | |
1554 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1555 | default: |
1556 | return -EINVAL; | |
457a6b58 | 1557 | } |
457a6b58 MD |
1558 | } |
1559 | ||
cb11f03a | 1560 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
e58095ef | 1561 | struct lttng_ust_context *context_param) |
457a6b58 | 1562 | { |
e58095ef | 1563 | return -ENOSYS; |
457a6b58 MD |
1564 | } |
1565 | ||
cb11f03a | 1566 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1567 | { |
cb11f03a FD |
1568 | if (!event_enabler) { |
1569 | return; | |
0f63324a | 1570 | } |
cb11f03a | 1571 | cds_list_del(&event_enabler->node); |
0f63324a | 1572 | |
cb11f03a | 1573 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef | 1574 | |
cb11f03a FD |
1575 | lttng_destroy_context(event_enabler->ctx); |
1576 | free(event_enabler); | |
457a6b58 MD |
1577 | } |
1578 | ||
e58095ef | 1579 | /* |
cb11f03a | 1580 | * lttng_session_sync_event_enablers should be called just before starting a |
e58095ef MD |
1581 | * session. |
1582 | */ | |
457a6b58 | 1583 | static |
cb11f03a | 1584 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1585 | { |
cb11f03a | 1586 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1587 | struct lttng_event *event; |
457a6b58 | 1588 | |
cb11f03a FD |
1589 | cds_list_for_each_entry(event_enabler, &session->enablers_head, node) |
1590 | lttng_event_enabler_ref_events(event_enabler); | |
e58095ef MD |
1591 | /* |
1592 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1593 | * and its channel and session transient states are enabled, we |
1594 | * enable the event, else we disable it. | |
e58095ef MD |
1595 | */ |
1596 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1597 | struct lttng_enabler_ref *enabler_ref; | |
1598 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1599 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1600 | |
1601 | /* Enable events */ | |
1602 | cds_list_for_each_entry(enabler_ref, | |
1603 | &event->enablers_ref_head, node) { | |
1604 | if (enabler_ref->ref->enabled) { | |
1605 | enabled = 1; | |
1606 | break; | |
1607 | } | |
1608 | } | |
ac6b4ac6 MD |
1609 | /* |
1610 | * Enabled state is based on union of enablers, with | |
1611 | * intesection of session and channel transient enable | |
1612 | * states. | |
1613 | */ | |
1614 | enabled = enabled && session->tstate && event->chan->tstate; | |
1615 | ||
1616 | CMM_STORE_SHARED(event->enabled, enabled); | |
1617 | /* | |
1618 | * Sync tracepoint registration with event enabled | |
1619 | * state. | |
1620 | */ | |
1621 | if (enabled) { | |
1622 | if (!event->registered) | |
1623 | register_event(event); | |
1624 | } else { | |
1625 | if (event->registered) | |
1626 | unregister_event(event); | |
1627 | } | |
457a6b58 | 1628 | |
1f49fc05 | 1629 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1630 | cds_list_for_each_entry(enabler_ref, |
1631 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1632 | if (enabler_ref->ref->enabled |
1633 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1634 | has_enablers_without_bytecode = 1; |
1635 | break; | |
1636 | } | |
1637 | } | |
1638 | event->has_enablers_without_bytecode = | |
1639 | has_enablers_without_bytecode; | |
1640 | ||
e58095ef MD |
1641 | /* Enable filters */ |
1642 | cds_list_for_each_entry(runtime, | |
cb11f03a FD |
1643 | &event->filter_bytecode_runtime_head, node) { |
1644 | lttng_bytecode_filter_sync_state(runtime); | |
1645 | } | |
1646 | } | |
1647 | __tracepoint_probe_prune_release_queue(); | |
1648 | } | |
1649 | ||
1650 | static | |
1651 | void lttng_create_trigger_if_missing(struct lttng_trigger_enabler *trigger_enabler) | |
1652 | { | |
1653 | struct lttng_trigger_group *trigger_group = trigger_enabler->group; | |
1654 | struct lttng_probe_desc *probe_desc; | |
1655 | struct cds_list_head *probe_list; | |
1656 | int i; | |
1657 | ||
1658 | probe_list = lttng_get_probe_list_head(); | |
1659 | ||
1660 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1661 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1662 | int ret; | |
1663 | bool found = false; | |
1664 | const struct lttng_event_desc *desc; | |
1665 | struct lttng_trigger *trigger; | |
1666 | struct cds_hlist_head *head; | |
1667 | struct cds_hlist_node *node; | |
1668 | ||
1669 | desc = probe_desc->event_desc[i]; | |
1670 | ||
1671 | if (!lttng_desc_match_enabler(desc, | |
1672 | lttng_trigger_enabler_as_enabler(trigger_enabler))) | |
1673 | continue; | |
1674 | ||
1675 | /* | |
1676 | * Given the current trigger group, get the bucket that | |
1677 | * the target trigger would be if it was already | |
1678 | * created. | |
1679 | */ | |
1680 | head = borrow_hash_table_bucket( | |
1681 | trigger_group->triggers_ht.table, | |
1682 | LTTNG_UST_TRIGGER_HT_SIZE, desc); | |
1683 | ||
1684 | cds_hlist_for_each_entry(trigger, node, head, hlist) { | |
1685 | /* | |
1686 | * Check if trigger already exists by checking | |
1687 | * if the trigger and enabler share the same | |
1688 | * description and id. | |
1689 | */ | |
1690 | if (trigger->desc == desc && | |
1691 | trigger->id == trigger_enabler->id) { | |
1692 | found = true; | |
1693 | break; | |
1694 | } | |
1695 | } | |
1696 | ||
1697 | if (found) | |
1698 | continue; | |
1699 | ||
1700 | /* | |
1701 | * We need to create a trigger for this event probe. | |
1702 | */ | |
1703 | ret = lttng_trigger_create(desc, trigger_enabler->id, | |
1704 | trigger_group); | |
1705 | if (ret) { | |
1706 | DBG("Unable to create trigger %s, error %d\n", | |
1707 | probe_desc->event_desc[i]->name, ret); | |
1708 | } | |
1709 | } | |
1710 | } | |
1711 | } | |
1712 | ||
1713 | /* | |
1714 | * Create triggers associated with a trigger enabler (if not already present). | |
1715 | */ | |
1716 | static | |
1717 | int lttng_trigger_enabler_ref_triggers(struct lttng_trigger_enabler *trigger_enabler) | |
1718 | { | |
1719 | struct lttng_trigger_group *trigger_group = trigger_enabler->group; | |
1720 | struct lttng_trigger *trigger; | |
1721 | ||
1722 | /* | |
1723 | * Only try to create triggers for enablers that are enabled, the user | |
1724 | * might still be attaching filter or exclusion to the | |
1725 | * trigger_enabler. | |
1726 | */ | |
1727 | if (!lttng_trigger_enabler_as_enabler(trigger_enabler)->enabled) | |
1728 | goto end; | |
1729 | ||
1730 | /* First, ensure that probe triggers are created for this enabler. */ | |
1731 | lttng_create_trigger_if_missing(trigger_enabler); | |
1732 | ||
1733 | /* Link the created trigger with its associated enabler. */ | |
1734 | cds_list_for_each_entry(trigger, &trigger_group->triggers_head, node) { | |
1735 | struct lttng_enabler_ref *enabler_ref; | |
1736 | ||
1737 | if (!lttng_trigger_enabler_match_trigger(trigger_enabler, trigger)) | |
1738 | continue; | |
1739 | ||
1740 | enabler_ref = lttng_enabler_ref(&trigger->enablers_ref_head, | |
1741 | lttng_trigger_enabler_as_enabler(trigger_enabler)); | |
1742 | if (!enabler_ref) { | |
1743 | /* | |
1744 | * If no backward ref, create it. | |
1745 | * Add backward ref from trigger to enabler. | |
1746 | */ | |
1747 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1748 | if (!enabler_ref) | |
1749 | return -ENOMEM; | |
1750 | ||
1751 | enabler_ref->ref = lttng_trigger_enabler_as_enabler( | |
1752 | trigger_enabler); | |
1753 | cds_list_add(&enabler_ref->node, | |
1754 | &trigger->enablers_ref_head); | |
1755 | } | |
1756 | ||
1757 | /* | |
1758 | * Link filter bytecodes if not linked yet. | |
1759 | */ | |
1760 | lttng_enabler_link_bytecode(trigger->desc, | |
1761 | &trigger_group->ctx, &trigger->filter_bytecode_runtime_head, | |
1762 | <tng_trigger_enabler_as_enabler(trigger_enabler)->filter_bytecode_head); | |
1763 | ||
1764 | /* | |
1765 | * Link capture bytecodes if not linked yet. | |
1766 | */ | |
1767 | lttng_enabler_link_bytecode(trigger->desc, | |
1768 | &trigger_group->ctx, &trigger->capture_bytecode_runtime_head, | |
1769 | &trigger_enabler->capture_bytecode_head); | |
1770 | trigger->num_captures = trigger_enabler->num_captures; | |
1771 | } | |
1772 | end: | |
1773 | return 0; | |
1774 | } | |
1775 | ||
1776 | static | |
1777 | void lttng_trigger_group_sync_enablers(struct lttng_trigger_group *trigger_group) | |
1778 | { | |
1779 | struct lttng_trigger_enabler *trigger_enabler; | |
1780 | struct lttng_trigger *trigger; | |
1781 | ||
1782 | cds_list_for_each_entry(trigger_enabler, &trigger_group->enablers_head, node) | |
1783 | lttng_trigger_enabler_ref_triggers(trigger_enabler); | |
1784 | ||
1785 | /* | |
1786 | * For each trigger, if at least one of its enablers is enabled, | |
1787 | * we enable the trigger, else we disable it. | |
1788 | */ | |
1789 | cds_list_for_each_entry(trigger, &trigger_group->triggers_head, node) { | |
1790 | struct lttng_enabler_ref *enabler_ref; | |
1791 | struct lttng_bytecode_runtime *runtime; | |
1792 | int enabled = 0, has_enablers_without_bytecode = 0; | |
1793 | ||
1794 | /* Enable triggers */ | |
1795 | cds_list_for_each_entry(enabler_ref, | |
1796 | &trigger->enablers_ref_head, node) { | |
1797 | if (enabler_ref->ref->enabled) { | |
1798 | enabled = 1; | |
1799 | break; | |
1800 | } | |
1801 | } | |
1802 | ||
1803 | CMM_STORE_SHARED(trigger->enabled, enabled); | |
1804 | /* | |
1805 | * Sync tracepoint registration with trigger enabled | |
1806 | * state. | |
1807 | */ | |
1808 | if (enabled) { | |
1809 | if (!trigger->registered) | |
1810 | register_trigger(trigger); | |
1811 | } else { | |
1812 | if (trigger->registered) | |
1813 | unregister_trigger(trigger); | |
1814 | } | |
1815 | ||
1816 | /* Check if has enablers without bytecode enabled */ | |
1817 | cds_list_for_each_entry(enabler_ref, | |
1818 | &trigger->enablers_ref_head, node) { | |
1819 | if (enabler_ref->ref->enabled | |
1820 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1821 | has_enablers_without_bytecode = 1; | |
1822 | break; | |
1823 | } | |
1824 | } | |
1825 | trigger->has_enablers_without_bytecode = | |
1826 | has_enablers_without_bytecode; | |
1827 | ||
1828 | /* Enable filters */ | |
1829 | cds_list_for_each_entry(runtime, | |
1830 | &trigger->filter_bytecode_runtime_head, node) { | |
1831 | lttng_bytecode_filter_sync_state(runtime); | |
1832 | } | |
1833 | ||
1834 | /* Enable captures. */ | |
1835 | cds_list_for_each_entry(runtime, | |
1836 | &trigger->capture_bytecode_runtime_head, node) { | |
1837 | lttng_bytecode_capture_sync_state(runtime); | |
457a6b58 MD |
1838 | } |
1839 | } | |
baa1e0bc | 1840 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1841 | } |
1842 | ||
e58095ef MD |
1843 | /* |
1844 | * Apply enablers to session events, adding events to session if need | |
1845 | * be. It is required after each modification applied to an active | |
1846 | * session, and right before session "start". | |
1847 | * "lazy" sync means we only sync if required. | |
1848 | */ | |
1849 | static | |
cb11f03a | 1850 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1851 | { |
e58095ef MD |
1852 | /* We can skip if session is not active */ |
1853 | if (!session->active) | |
1854 | return; | |
cb11f03a | 1855 | lttng_session_sync_event_enablers(session); |
457a6b58 | 1856 | } |
53569322 MD |
1857 | |
1858 | /* | |
1859 | * Update all sessions with the given app context. | |
1860 | * Called with ust lock held. | |
1861 | * This is invoked when an application context gets loaded/unloaded. It | |
1862 | * ensures the context callbacks are in sync with the application | |
1863 | * context (either app context callbacks, or dummy callbacks). | |
1864 | */ | |
1865 | void lttng_ust_context_set_session_provider(const char *name, | |
1866 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1867 | void (*record)(struct lttng_ctx_field *field, | |
1868 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1869 | struct lttng_channel *chan), | |
1870 | void (*get_value)(struct lttng_ctx_field *field, | |
1871 | struct lttng_ctx_value *value)) | |
1872 | { | |
1873 | struct lttng_session *session; | |
1874 | ||
1875 | cds_list_for_each_entry(session, &sessions, node) { | |
1876 | struct lttng_channel *chan; | |
1877 | struct lttng_event *event; | |
1878 | int ret; | |
1879 | ||
1880 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1881 | name, get_size, record, get_value); | |
1882 | if (ret) | |
1883 | abort(); | |
1884 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1885 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1886 | name, get_size, record, get_value); | |
1887 | if (ret) | |
1888 | abort(); | |
1889 | } | |
1890 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1891 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1892 | name, get_size, record, get_value); | |
1893 | if (ret) | |
1894 | abort(); | |
1895 | } | |
1896 | } | |
1897 | } | |
cb11f03a FD |
1898 | |
1899 | /* | |
1900 | * Update all trigger groups with the given app context. | |
1901 | * Called with ust lock held. | |
1902 | * This is invoked when an application context gets loaded/unloaded. It | |
1903 | * ensures the context callbacks are in sync with the application | |
1904 | * context (either app context callbacks, or dummy callbacks). | |
1905 | */ | |
1906 | void lttng_ust_context_set_trigger_group_provider(const char *name, | |
1907 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1908 | void (*record)(struct lttng_ctx_field *field, | |
1909 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1910 | struct lttng_channel *chan), | |
1911 | void (*get_value)(struct lttng_ctx_field *field, | |
1912 | struct lttng_ctx_value *value)) | |
1913 | { | |
1914 | struct lttng_trigger_group *trigger_group; | |
1915 | ||
1916 | cds_list_for_each_entry(trigger_group, &trigger_groups, node) { | |
1917 | int ret; | |
1918 | ||
1919 | ret = lttng_ust_context_set_provider_rcu(&trigger_group->ctx, | |
1920 | name, get_size, record, get_value); | |
1921 | if (ret) | |
1922 | abort(); | |
1923 | } | |
1924 | } |