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> |
4e3b3630 | 26 | #include <assert.h> |
b5234c06 | 27 | #include <errno.h> |
4e3b3630 JR |
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> |
4e3b3630 | 37 | #include <unistd.h> |
2ae57758 | 38 | #include <lttng/ust-endian.h> |
44c72f10 MD |
39 | |
40 | #include <urcu-bp.h> | |
4e3b3630 | 41 | #include <urcu/arch.h> |
44c72f10 | 42 | #include <urcu/compiler.h> |
4e3b3630 JR |
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> |
4e3b3630 | 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" |
4e3b3630 | 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" |
4e3b3630 JR |
67 | #include "context-internal.h" |
68 | #include "ust-events-internal.h" | |
b728d87e | 69 | #include "wait.h" |
8d8a24c8 | 70 | #include "../libringbuffer/shm.h" |
4e3b3630 | 71 | #include "../libcounter/counter.h" |
596c4223 | 72 | #include "jhash.h" |
4e3b3630 | 73 | #include <lttng/ust-abi.h> |
8165c8da MD |
74 | |
75 | /* | |
3327ac33 MD |
76 | * All operations within this file are called by the communication |
77 | * thread, under ust_lock protection. | |
8165c8da | 78 | */ |
8165c8da | 79 | |
b5234c06 | 80 | static CDS_LIST_HEAD(sessions); |
4e3b3630 | 81 | static CDS_LIST_HEAD(trigger_groups); |
8165c8da | 82 | |
37dddb65 MD |
83 | struct cds_list_head *_lttng_get_sessions(void) |
84 | { | |
85 | return &sessions; | |
86 | } | |
87 | ||
7dd08bec | 88 | static void _lttng_event_destroy(struct lttng_event *event); |
4e3b3630 | 89 | static void _lttng_trigger_destroy(struct lttng_trigger *trigger); |
c785c634 | 90 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 91 | |
e58095ef | 92 | static |
4e3b3630 JR |
93 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
94 | static | |
95 | void lttng_session_sync_event_enablers(struct lttng_session *session); | |
e58095ef | 96 | static |
4e3b3630 | 97 | void lttng_trigger_group_sync_enablers(struct lttng_trigger_group *trigger_group); |
e58095ef MD |
98 | static |
99 | void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
100 | ||
6715d7d1 MD |
101 | /* |
102 | * Called with ust lock held. | |
103 | */ | |
104 | int lttng_session_active(void) | |
105 | { | |
106 | struct lttng_session *iter; | |
107 | ||
108 | cds_list_for_each_entry(iter, &sessions, node) { | |
109 | if (iter->active) | |
110 | return 1; | |
111 | } | |
112 | return 0; | |
113 | } | |
114 | ||
e58095ef MD |
115 | static |
116 | int lttng_loglevel_match(int loglevel, | |
117 | unsigned int has_loglevel, | |
457a6b58 MD |
118 | enum lttng_ust_loglevel_type req_type, |
119 | int req_loglevel) | |
120 | { | |
e58095ef MD |
121 | if (!has_loglevel) |
122 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
123 | switch (req_type) { |
124 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 125 | if (loglevel <= req_loglevel |
67ada458 | 126 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
127 | return 1; |
128 | else | |
129 | return 0; | |
130 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 131 | if (loglevel == req_loglevel |
67ada458 | 132 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
133 | return 1; |
134 | else | |
135 | return 0; | |
136 | case LTTNG_UST_LOGLEVEL_ALL: | |
137 | default: | |
67ada458 | 138 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
139 | return 1; |
140 | else | |
141 | return 0; | |
457a6b58 MD |
142 | } |
143 | } | |
144 | ||
8020ceb5 MD |
145 | void synchronize_trace(void) |
146 | { | |
8020ceb5 | 147 | synchronize_rcu(); |
8020ceb5 MD |
148 | } |
149 | ||
7dd08bec | 150 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 151 | { |
7dd08bec | 152 | struct lttng_session *session; |
74d81a6c | 153 | int i; |
8020ceb5 | 154 | |
7dd08bec | 155 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
156 | if (!session) |
157 | return NULL; | |
4e3b3630 | 158 | if (lttng_context_init_all(&session->ctx)) { |
53569322 MD |
159 | free(session); |
160 | return NULL; | |
161 | } | |
e58095ef MD |
162 | CDS_INIT_LIST_HEAD(&session->chan_head); |
163 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 164 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 165 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
166 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
167 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
168 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
169 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 170 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
171 | return session; |
172 | } | |
173 | ||
4e3b3630 JR |
174 | struct lttng_counter *lttng_ust_counter_create( |
175 | const char *counter_transport_name, | |
176 | size_t number_dimensions, const struct lttng_counter_dimension *dimensions) | |
177 | { | |
178 | struct lttng_counter_transport *counter_transport = NULL; | |
179 | struct lttng_counter *counter = NULL; | |
180 | ||
181 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
182 | if (!counter_transport) | |
183 | goto notransport; | |
184 | counter = zmalloc(sizeof(struct lttng_counter)); | |
185 | if (!counter) | |
186 | goto nomem; | |
187 | ||
188 | /* Create trigger error counter. */ | |
189 | counter->ops = &counter_transport->ops; | |
190 | counter->transport = counter_transport; | |
191 | ||
192 | counter->counter = counter->ops->counter_create( | |
193 | number_dimensions, dimensions, 0, | |
194 | -1, 0, NULL, false); | |
195 | if (!counter->counter) { | |
196 | goto create_error; | |
197 | } | |
198 | ||
199 | return counter; | |
200 | ||
201 | create_error: | |
202 | free(counter); | |
203 | nomem: | |
204 | notransport: | |
205 | return NULL; | |
206 | } | |
207 | ||
208 | static | |
209 | void lttng_ust_counter_destroy(struct lttng_counter *counter) | |
210 | { | |
211 | counter->ops->counter_destroy(counter->counter); | |
212 | free(counter); | |
213 | } | |
214 | ||
215 | struct lttng_trigger_group *lttng_trigger_group_create(void) | |
216 | { | |
217 | struct lttng_trigger_group *trigger_group; | |
218 | int i; | |
219 | ||
220 | trigger_group = zmalloc(sizeof(struct lttng_trigger_group)); | |
221 | if (!trigger_group) | |
222 | return NULL; | |
223 | ||
224 | /* Add all contexts. */ | |
225 | if (lttng_context_init_all(&trigger_group->ctx)) { | |
226 | free(trigger_group); | |
227 | return NULL; | |
228 | } | |
229 | ||
230 | CDS_INIT_LIST_HEAD(&trigger_group->enablers_head); | |
231 | CDS_INIT_LIST_HEAD(&trigger_group->triggers_head); | |
232 | for (i = 0; i < LTTNG_UST_TRIGGER_HT_SIZE; i++) | |
233 | CDS_INIT_HLIST_HEAD(&trigger_group->triggers_ht.table[i]); | |
234 | ||
235 | cds_list_add(&trigger_group->node, &trigger_groups); | |
236 | ||
237 | return trigger_group; | |
238 | } | |
239 | ||
74d81a6c MD |
240 | /* |
241 | * Only used internally at session destruction. | |
242 | */ | |
243 | static | |
244 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
245 | { | |
246 | struct channel *chan; | |
247 | struct lttng_ust_shm_handle *handle; | |
248 | ||
249 | cds_list_del(<tng_chan->node); | |
250 | lttng_destroy_context(lttng_chan->ctx); | |
251 | chan = lttng_chan->chan; | |
252 | handle = lttng_chan->handle; | |
253 | /* | |
254 | * note: lttng_chan is private data contained within handle. It | |
255 | * will be freed along with the handle. | |
256 | */ | |
257 | channel_destroy(chan, handle, 0); | |
258 | } | |
259 | ||
ac6b4ac6 MD |
260 | static |
261 | void register_event(struct lttng_event *event) | |
262 | { | |
263 | int ret; | |
264 | const struct lttng_event_desc *desc; | |
265 | ||
266 | assert(event->registered == 0); | |
267 | desc = event->desc; | |
baa1e0bc | 268 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
269 | desc->probe_callback, |
270 | event, desc->signature); | |
271 | WARN_ON_ONCE(ret); | |
272 | if (!ret) | |
273 | event->registered = 1; | |
274 | } | |
275 | ||
4e3b3630 JR |
276 | static |
277 | void register_trigger(struct lttng_trigger *trigger) | |
278 | { | |
279 | int ret; | |
280 | const struct lttng_event_desc *desc; | |
281 | ||
282 | assert(trigger->registered == 0); | |
283 | desc = trigger->desc; | |
284 | ret = __tracepoint_probe_register_queue_release(desc->name, | |
285 | desc->u.ext.trigger_callback, trigger, desc->signature); | |
286 | WARN_ON_ONCE(ret); | |
287 | if (!ret) | |
288 | trigger->registered = 1; | |
289 | } | |
290 | ||
ac6b4ac6 MD |
291 | static |
292 | void unregister_event(struct lttng_event *event) | |
293 | { | |
294 | int ret; | |
295 | const struct lttng_event_desc *desc; | |
296 | ||
297 | assert(event->registered == 1); | |
298 | desc = event->desc; | |
baa1e0bc | 299 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
300 | desc->probe_callback, |
301 | event); | |
302 | WARN_ON_ONCE(ret); | |
303 | if (!ret) | |
304 | event->registered = 0; | |
305 | } | |
306 | ||
4e3b3630 JR |
307 | static |
308 | void unregister_trigger(struct lttng_trigger *trigger) | |
309 | { | |
310 | int ret; | |
311 | const struct lttng_event_desc *desc; | |
312 | ||
313 | assert(trigger->registered == 1); | |
314 | desc = trigger->desc; | |
315 | ret = __tracepoint_probe_unregister_queue_release(desc->name, | |
316 | desc->u.ext.trigger_callback, trigger); | |
317 | WARN_ON_ONCE(ret); | |
318 | if (!ret) | |
319 | trigger->registered = 0; | |
320 | } | |
321 | ||
ac6b4ac6 MD |
322 | /* |
323 | * Only used internally at session destruction. | |
324 | */ | |
325 | static | |
326 | void _lttng_event_unregister(struct lttng_event *event) | |
327 | { | |
328 | if (event->registered) | |
329 | unregister_event(event); | |
330 | } | |
331 | ||
4e3b3630 JR |
332 | /* |
333 | * Only used internally at session destruction. | |
334 | */ | |
335 | static | |
336 | void _lttng_trigger_unregister(struct lttng_trigger *trigger) | |
337 | { | |
338 | if (trigger->registered) | |
339 | unregister_trigger(trigger); | |
340 | } | |
341 | ||
7dd08bec | 342 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 343 | { |
7dd08bec MD |
344 | struct lttng_channel *chan, *tmpchan; |
345 | struct lttng_event *event, *tmpevent; | |
c785c634 | 346 | struct lttng_enum *_enum, *tmp_enum; |
4e3b3630 | 347 | struct lttng_event_enabler *event_enabler, *event_tmpenabler; |
8020ceb5 | 348 | |
b5234c06 | 349 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 350 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 351 | _lttng_event_unregister(event); |
8020ceb5 MD |
352 | } |
353 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
baa1e0bc | 354 | __tracepoint_probe_prune_release_queue(); |
4e3b3630 | 355 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
e58095ef | 356 | &session->enablers_head, node) |
4e3b3630 | 357 | lttng_event_enabler_destroy(event_enabler); |
e58095ef MD |
358 | cds_list_for_each_entry_safe(event, tmpevent, |
359 | &session->events_head, node) | |
7dd08bec | 360 | _lttng_event_destroy(event); |
c785c634 MD |
361 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
362 | &session->enums_head, node) | |
363 | _lttng_enum_destroy(_enum); | |
e58095ef | 364 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 365 | _lttng_channel_unmap(chan); |
e58095ef | 366 | cds_list_del(&session->node); |
53569322 | 367 | lttng_destroy_context(session->ctx); |
b5234c06 | 368 | free(session); |
8020ceb5 MD |
369 | } |
370 | ||
4e3b3630 JR |
371 | void lttng_trigger_group_destroy( |
372 | struct lttng_trigger_group *trigger_group) | |
373 | { | |
374 | int close_ret; | |
375 | struct lttng_trigger_enabler *trigger_enabler, *tmptrigger_enabler; | |
376 | struct lttng_trigger *trigger, *tmptrigger; | |
377 | ||
378 | if (!trigger_group) { | |
379 | return; | |
380 | } | |
381 | ||
382 | cds_list_for_each_entry(trigger, &trigger_group->triggers_head, node) | |
383 | _lttng_trigger_unregister(trigger); | |
384 | ||
385 | synchronize_trace(); | |
386 | ||
387 | cds_list_for_each_entry_safe(trigger_enabler, tmptrigger_enabler, | |
388 | &trigger_group->enablers_head, node) | |
389 | lttng_trigger_enabler_destroy(trigger_enabler); | |
390 | ||
391 | cds_list_for_each_entry_safe(trigger, tmptrigger, | |
392 | &trigger_group->triggers_head, node) | |
393 | _lttng_trigger_destroy(trigger); | |
394 | ||
395 | if (trigger_group->error_counter) | |
396 | lttng_ust_counter_destroy(trigger_group->error_counter); | |
397 | ||
398 | /* Close the notification fd to the listener of triggers. */ | |
399 | ||
400 | lttng_ust_lock_fd_tracker(); | |
401 | close_ret = close(trigger_group->notification_fd); | |
402 | if (!close_ret) { | |
403 | lttng_ust_delete_fd_from_tracker(trigger_group->notification_fd); | |
404 | } else { | |
405 | PERROR("close"); | |
406 | abort(); | |
407 | } | |
408 | lttng_ust_unlock_fd_tracker(); | |
409 | ||
410 | cds_list_del(&trigger_group->node); | |
411 | ||
412 | free(trigger_group); | |
413 | } | |
414 | ||
415 | static | |
416 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
417 | { | |
418 | struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node; | |
419 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; | |
420 | ||
421 | if (!enabler) { | |
422 | return; | |
423 | } | |
424 | ||
425 | /* Destroy filter bytecode */ | |
426 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
427 | &enabler->filter_bytecode_head, node) { | |
428 | free(filter_node); | |
429 | } | |
430 | ||
431 | /* Destroy excluders */ | |
432 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
433 | &enabler->excluder_head, node) { | |
434 | free(excluder_node); | |
435 | } | |
436 | } | |
437 | ||
438 | void lttng_trigger_enabler_destroy(struct lttng_trigger_enabler *trigger_enabler) | |
439 | { | |
440 | if (!trigger_enabler) { | |
441 | return; | |
442 | } | |
443 | ||
444 | cds_list_del(&trigger_enabler->node); | |
445 | ||
446 | lttng_enabler_destroy(lttng_trigger_enabler_as_enabler(trigger_enabler)); | |
447 | ||
448 | free(trigger_enabler); | |
449 | } | |
450 | ||
53569322 MD |
451 | static |
452 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
453 | struct lttng_session *session) | |
454 | { | |
455 | const char *enum_name = desc->name; | |
456 | struct lttng_enum *_enum; | |
457 | struct cds_hlist_head *head; | |
53569322 MD |
458 | int ret = 0; |
459 | size_t name_len = strlen(enum_name); | |
460 | uint32_t hash; | |
461 | int notify_socket; | |
462 | ||
b33b46f7 | 463 | /* Check if this enum is already registered for this session. */ |
53569322 MD |
464 | hash = jhash(enum_name, name_len, 0); |
465 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
b33b46f7 FD |
466 | |
467 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
468 | if (_enum) { | |
469 | ret = -EEXIST; | |
470 | goto exist; | |
53569322 MD |
471 | } |
472 | ||
473 | notify_socket = lttng_get_notify_socket(session->owner); | |
474 | if (notify_socket < 0) { | |
475 | ret = notify_socket; | |
476 | goto socket_error; | |
477 | } | |
478 | ||
479 | _enum = zmalloc(sizeof(*_enum)); | |
480 | if (!_enum) { | |
481 | ret = -ENOMEM; | |
482 | goto cache_error; | |
483 | } | |
484 | _enum->session = session; | |
485 | _enum->desc = desc; | |
486 | ||
487 | ret = ustcomm_register_enum(notify_socket, | |
488 | session->objd, | |
489 | enum_name, | |
490 | desc->nr_entries, | |
491 | desc->entries, | |
492 | &_enum->id); | |
493 | if (ret < 0) { | |
494 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
495 | goto sessiond_register_error; | |
496 | } | |
497 | cds_list_add(&_enum->node, &session->enums_head); | |
498 | cds_hlist_add_head(&_enum->hlist, head); | |
499 | return 0; | |
500 | ||
501 | sessiond_register_error: | |
502 | free(_enum); | |
503 | cache_error: | |
504 | socket_error: | |
505 | exist: | |
506 | return ret; | |
507 | } | |
508 | ||
509 | static | |
510 | int lttng_create_enum_check(const struct lttng_type *type, | |
511 | struct lttng_session *session) | |
512 | { | |
513 | switch (type->atype) { | |
514 | case atype_enum: | |
515 | { | |
516 | const struct lttng_enum_desc *enum_desc; | |
517 | int ret; | |
518 | ||
218deb69 MD |
519 | enum_desc = type->u.legacy.basic.enumeration.desc; |
520 | ret = lttng_enum_create(enum_desc, session); | |
521 | if (ret && ret != -EEXIST) { | |
522 | DBG("Unable to create enum error: (%d)", ret); | |
523 | return ret; | |
524 | } | |
525 | break; | |
526 | } | |
527 | case atype_enum_nestable: | |
528 | { | |
529 | const struct lttng_enum_desc *enum_desc; | |
530 | int ret; | |
531 | ||
532 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
533 | ret = lttng_enum_create(enum_desc, session); |
534 | if (ret && ret != -EEXIST) { | |
535 | DBG("Unable to create enum error: (%d)", ret); | |
536 | return ret; | |
537 | } | |
538 | break; | |
539 | } | |
540 | case atype_dynamic: | |
541 | { | |
542 | const struct lttng_event_field *tag_field_generic; | |
543 | const struct lttng_enum_desc *enum_desc; | |
544 | int ret; | |
545 | ||
546 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 547 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
548 | ret = lttng_enum_create(enum_desc, session); |
549 | if (ret && ret != -EEXIST) { | |
550 | DBG("Unable to create enum error: (%d)", ret); | |
551 | return ret; | |
552 | } | |
553 | break; | |
554 | } | |
555 | default: | |
556 | /* TODO: nested types when they become supported. */ | |
557 | break; | |
558 | } | |
559 | return 0; | |
560 | } | |
561 | ||
562 | static | |
563 | int lttng_create_all_event_enums(size_t nr_fields, | |
564 | const struct lttng_event_field *event_fields, | |
565 | struct lttng_session *session) | |
566 | { | |
567 | size_t i; | |
568 | int ret; | |
569 | ||
570 | /* For each field, ensure enum is part of the session. */ | |
571 | for (i = 0; i < nr_fields; i++) { | |
572 | const struct lttng_type *type = &event_fields[i].type; | |
573 | ||
574 | ret = lttng_create_enum_check(type, session); | |
575 | if (ret) | |
576 | return ret; | |
577 | } | |
578 | return 0; | |
579 | } | |
580 | ||
581 | static | |
582 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
583 | const struct lttng_ctx_field *ctx_fields, | |
584 | struct lttng_session *session) | |
585 | { | |
586 | size_t i; | |
587 | int ret; | |
588 | ||
589 | /* For each field, ensure enum is part of the session. */ | |
590 | for (i = 0; i < nr_fields; i++) { | |
591 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
592 | ||
593 | ret = lttng_create_enum_check(type, session); | |
594 | if (ret) | |
595 | return ret; | |
596 | } | |
597 | return 0; | |
598 | } | |
599 | ||
710b8ee3 MD |
600 | /* |
601 | * Ensure that a state-dump will be performed for this session at the end | |
602 | * of the current handle_message(). | |
603 | */ | |
604 | int lttng_session_statedump(struct lttng_session *session) | |
605 | { | |
606 | session->statedump_pending = 1; | |
607 | lttng_ust_sockinfo_session_enabled(session->owner); | |
608 | return 0; | |
609 | } | |
53569322 | 610 | |
7dd08bec | 611 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
612 | { |
613 | int ret = 0; | |
7dd08bec | 614 | struct lttng_channel *chan; |
32ce8569 | 615 | int notify_socket; |
8020ceb5 | 616 | |
8020ceb5 MD |
617 | if (session->active) { |
618 | ret = -EBUSY; | |
619 | goto end; | |
620 | } | |
621 | ||
32ce8569 MD |
622 | notify_socket = lttng_get_notify_socket(session->owner); |
623 | if (notify_socket < 0) | |
624 | return notify_socket; | |
625 | ||
ac6b4ac6 MD |
626 | /* Set transient enabler state to "enabled" */ |
627 | session->tstate = 1; | |
e58095ef | 628 | |
3ff7660f | 629 | /* We need to sync enablers with session before activation. */ |
4e3b3630 | 630 | lttng_session_sync_event_enablers(session); |
3ff7660f | 631 | |
8020ceb5 MD |
632 | /* |
633 | * Snapshot the number of events per channel to know the type of header | |
634 | * we need to use. | |
635 | */ | |
e58095ef | 636 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 637 | const struct lttng_ctx *ctx; |
83e43212 | 638 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 639 | size_t nr_fields = 0; |
6ca18e66 | 640 | uint32_t chan_id; |
32ce8569 MD |
641 | |
642 | /* don't change it if session stop/restart */ | |
8020ceb5 | 643 | if (chan->header_type) |
32ce8569 MD |
644 | continue; |
645 | ctx = chan->ctx; | |
646 | if (ctx) { | |
647 | nr_fields = ctx->nr_fields; | |
83e43212 | 648 | fields = ctx->fields; |
53569322 MD |
649 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
650 | session); | |
651 | if (ret < 0) { | |
652 | DBG("Error (%d) adding enum to session", ret); | |
653 | return ret; | |
654 | } | |
32ce8569 MD |
655 | } |
656 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 657 | session, |
32ce8569 MD |
658 | session->objd, |
659 | chan->objd, | |
660 | nr_fields, | |
661 | fields, | |
6ca18e66 | 662 | &chan_id, |
32ce8569 | 663 | &chan->header_type); |
b869b5ae MD |
664 | if (ret) { |
665 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 666 | return ret; |
b869b5ae | 667 | } |
6ca18e66 MD |
668 | if (chan_id != chan->id) { |
669 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
670 | chan_id, chan->id); | |
671 | return -EINVAL; | |
672 | } | |
8020ceb5 MD |
673 | } |
674 | ||
ac6b4ac6 | 675 | /* Set atomically the state to "active" */ |
b5234c06 MD |
676 | CMM_ACCESS_ONCE(session->active) = 1; |
677 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 678 | |
710b8ee3 MD |
679 | ret = lttng_session_statedump(session); |
680 | if (ret) | |
681 | return ret; | |
8020ceb5 | 682 | end: |
8020ceb5 MD |
683 | return ret; |
684 | } | |
685 | ||
7dd08bec | 686 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
687 | { |
688 | int ret = 0; | |
689 | ||
8020ceb5 MD |
690 | if (!session->active) { |
691 | ret = -EBUSY; | |
692 | goto end; | |
693 | } | |
ac6b4ac6 | 694 | /* Set atomically the state to "inactive" */ |
b5234c06 | 695 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
696 | |
697 | /* Set transient enabler state to "disabled" */ | |
698 | session->tstate = 0; | |
4e3b3630 | 699 | lttng_session_sync_event_enablers(session); |
8020ceb5 | 700 | end: |
8020ceb5 MD |
701 | return ret; |
702 | } | |
703 | ||
7dd08bec | 704 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 705 | { |
ac6b4ac6 | 706 | int ret = 0; |
976fe9ea | 707 | |
ac6b4ac6 MD |
708 | if (channel->enabled) { |
709 | ret = -EBUSY; | |
710 | goto end; | |
711 | } | |
712 | /* Set transient enabler state to "enabled" */ | |
713 | channel->tstate = 1; | |
4e3b3630 | 714 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
715 | /* Set atomically the state to "enabled" */ |
716 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
717 | end: | |
718 | return ret; | |
976fe9ea MD |
719 | } |
720 | ||
7dd08bec | 721 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 722 | { |
ac6b4ac6 | 723 | int ret = 0; |
976fe9ea | 724 | |
ac6b4ac6 MD |
725 | if (!channel->enabled) { |
726 | ret = -EBUSY; | |
727 | goto end; | |
728 | } | |
729 | /* Set atomically the state to "disabled" */ | |
730 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
731 | /* Set transient enabler state to "enabled" */ | |
732 | channel->tstate = 0; | |
4e3b3630 | 733 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
734 | end: |
735 | return ret; | |
976fe9ea MD |
736 | } |
737 | ||
4e3b3630 JR |
738 | static inline |
739 | struct cds_hlist_head *borrow_hash_table_bucket( | |
740 | struct cds_hlist_head *hash_table, | |
741 | unsigned int hash_table_size, | |
742 | const struct lttng_event_desc *desc) | |
743 | { | |
744 | const char *event_name; | |
745 | size_t name_len; | |
746 | uint32_t hash; | |
747 | ||
748 | event_name = desc->name; | |
749 | name_len = strlen(event_name); | |
750 | ||
751 | hash = jhash(event_name, name_len, 0); | |
752 | return &hash_table[hash & (hash_table_size - 1)]; | |
753 | } | |
754 | ||
8020ceb5 MD |
755 | /* |
756 | * Supports event creation while tracing session is active. | |
757 | */ | |
e58095ef MD |
758 | static |
759 | int lttng_event_create(const struct lttng_event_desc *desc, | |
760 | struct lttng_channel *chan) | |
8020ceb5 | 761 | { |
7dd08bec | 762 | struct lttng_event *event; |
32ce8569 | 763 | struct lttng_session *session = chan->session; |
d56fa719 | 764 | struct cds_hlist_head *head; |
576599a0 | 765 | int ret = 0; |
32ce8569 MD |
766 | int notify_socket, loglevel; |
767 | const char *uri; | |
8020ceb5 | 768 | |
4e3b3630 JR |
769 | head = borrow_hash_table_bucket(chan->session->events_ht.table, |
770 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
457a6b58 | 771 | |
32ce8569 MD |
772 | notify_socket = lttng_get_notify_socket(session->owner); |
773 | if (notify_socket < 0) { | |
774 | ret = notify_socket; | |
775 | goto socket_error; | |
776 | } | |
777 | ||
53569322 MD |
778 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
779 | session); | |
c785c634 MD |
780 | if (ret < 0) { |
781 | DBG("Error (%d) adding enum to session", ret); | |
782 | goto create_enum_error; | |
783 | } | |
784 | ||
457a6b58 MD |
785 | /* |
786 | * Check if loglevel match. Refuse to connect event if not. | |
787 | */ | |
7dd08bec | 788 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
789 | if (!event) { |
790 | ret = -ENOMEM; | |
8020ceb5 | 791 | goto cache_error; |
576599a0 | 792 | } |
8020ceb5 | 793 | event->chan = chan; |
e58095ef | 794 | |
ac6b4ac6 MD |
795 | /* Event will be enabled by enabler sync. */ |
796 | event->enabled = 0; | |
797 | event->registered = 0; | |
4e3b3630 | 798 | CDS_INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
e58095ef MD |
799 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); |
800 | event->desc = desc; | |
32ce8569 MD |
801 | |
802 | if (desc->loglevel) | |
803 | loglevel = *(*event->desc->loglevel); | |
804 | else | |
805 | loglevel = TRACE_DEFAULT; | |
806 | if (desc->u.ext.model_emf_uri) | |
807 | uri = *(desc->u.ext.model_emf_uri); | |
808 | else | |
809 | uri = NULL; | |
810 | ||
13b21cd6 MD |
811 | /* Fetch event ID from sessiond */ |
812 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 813 | session, |
13b21cd6 MD |
814 | session->objd, |
815 | chan->objd, | |
4e3b3630 | 816 | desc->name, |
13b21cd6 MD |
817 | loglevel, |
818 | desc->signature, | |
819 | desc->nr_fields, | |
820 | desc->fields, | |
821 | uri, | |
822 | &event->id); | |
823 | if (ret < 0) { | |
824 | DBG("Error (%d) registering event to sessiond", ret); | |
825 | goto sessiond_register_error; | |
32ce8569 | 826 | } |
2b213b16 | 827 | |
e58095ef | 828 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 829 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 830 | return 0; |
8020ceb5 | 831 | |
32ce8569 | 832 | sessiond_register_error: |
b5234c06 | 833 | free(event); |
8020ceb5 | 834 | cache_error: |
c785c634 | 835 | create_enum_error: |
32ce8569 | 836 | socket_error: |
576599a0 | 837 | return ret; |
8020ceb5 MD |
838 | } |
839 | ||
4e3b3630 JR |
840 | static |
841 | int lttng_trigger_create(const struct lttng_event_desc *desc, | |
842 | uint64_t id, uint64_t error_counter_index, | |
843 | struct lttng_trigger_group *trigger_group) | |
844 | { | |
845 | struct lttng_trigger *trigger; | |
846 | struct cds_hlist_head *head; | |
847 | int ret = 0; | |
848 | ||
849 | /* | |
850 | * Get the hashtable bucket the created lttng_trigger object should be | |
851 | * inserted. | |
852 | */ | |
853 | head = borrow_hash_table_bucket(trigger_group->triggers_ht.table, | |
854 | LTTNG_UST_TRIGGER_HT_SIZE, desc); | |
855 | ||
856 | trigger = zmalloc(sizeof(struct lttng_trigger)); | |
857 | if (!trigger) { | |
858 | ret = -ENOMEM; | |
859 | goto error; | |
860 | } | |
861 | ||
862 | trigger->group = trigger_group; | |
863 | trigger->id = id; | |
864 | trigger->error_counter_index = error_counter_index; | |
865 | ||
866 | /* Trigger will be enabled by enabler sync. */ | |
867 | trigger->enabled = 0; | |
868 | trigger->registered = 0; | |
869 | ||
870 | CDS_INIT_LIST_HEAD(&trigger->filter_bytecode_runtime_head); | |
871 | CDS_INIT_LIST_HEAD(&trigger->capture_bytecode_runtime_head); | |
872 | CDS_INIT_LIST_HEAD(&trigger->enablers_ref_head); | |
873 | trigger->desc = desc; | |
874 | ||
875 | cds_list_add(&trigger->node, &trigger_group->triggers_head); | |
876 | cds_hlist_add_head(&trigger->hlist, head); | |
877 | ||
878 | return 0; | |
879 | ||
880 | error: | |
881 | return ret; | |
882 | } | |
883 | ||
884 | static | |
885 | void _lttng_trigger_destroy(struct lttng_trigger *trigger) | |
886 | { | |
887 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
888 | ||
889 | /* Remove from trigger list. */ | |
890 | cds_list_del(&trigger->node); | |
891 | /* Remove from trigger hash table. */ | |
892 | cds_hlist_del(&trigger->hlist); | |
893 | ||
894 | lttng_free_trigger_filter_runtime(trigger); | |
895 | ||
896 | /* Free trigger enabler refs */ | |
897 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
898 | &trigger->enablers_ref_head, node) | |
899 | free(enabler_ref); | |
900 | free(trigger); | |
901 | } | |
902 | ||
e58095ef | 903 | static |
196ec2df | 904 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
905 | struct lttng_enabler *enabler) |
906 | { | |
907 | int loglevel = 0; | |
7e2e405c | 908 | unsigned int has_loglevel = 0; |
e58095ef | 909 | |
4e3b3630 | 910 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f6f42e6 MD |
911 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
912 | desc->name, SIZE_MAX)) | |
e58095ef MD |
913 | return 0; |
914 | if (desc->loglevel) { | |
915 | loglevel = *(*desc->loglevel); | |
916 | has_loglevel = 1; | |
917 | } | |
918 | if (!lttng_loglevel_match(loglevel, | |
919 | has_loglevel, | |
920 | enabler->event_param.loglevel_type, | |
921 | enabler->event_param.loglevel)) | |
922 | return 0; | |
923 | return 1; | |
924 | } | |
925 | ||
926 | static | |
927 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
928 | struct lttng_enabler *enabler) | |
929 | { | |
930 | int loglevel = 0; | |
931 | unsigned int has_loglevel = 0; | |
932 | ||
4e3b3630 | 933 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
e58095ef MD |
934 | if (strcmp(desc->name, enabler->event_param.name)) |
935 | return 0; | |
936 | if (desc->loglevel) { | |
937 | loglevel = *(*desc->loglevel); | |
938 | has_loglevel = 1; | |
939 | } | |
940 | if (!lttng_loglevel_match(loglevel, | |
941 | has_loglevel, | |
942 | enabler->event_param.loglevel_type, | |
943 | enabler->event_param.loglevel)) | |
944 | return 0; | |
945 | return 1; | |
946 | } | |
947 | ||
948 | static | |
949 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
950 | struct lttng_enabler *enabler) | |
951 | { | |
4e3b3630 JR |
952 | switch (enabler->format_type) { |
953 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
196ec2df PP |
954 | { |
955 | struct lttng_ust_excluder_node *excluder; | |
956 | ||
957 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
958 | return 0; | |
959 | } | |
960 | ||
961 | /* | |
962 | * If the matching event matches with an excluder, | |
963 | * return 'does not match' | |
964 | */ | |
965 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
966 | int count; | |
967 | ||
968 | for (count = 0; count < excluder->excluder.count; count++) { | |
969 | int len; | |
970 | char *excluder_name; | |
971 | ||
972 | excluder_name = (char *) (excluder->excluder.names) | |
973 | + count * LTTNG_UST_SYM_NAME_LEN; | |
974 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 975 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 976 | return 0; |
ed5b5bbd JI |
977 | } |
978 | } | |
196ec2df | 979 | return 1; |
ed5b5bbd | 980 | } |
4e3b3630 | 981 | case LTTNG_ENABLER_FORMAT_EVENT: |
e58095ef MD |
982 | return lttng_desc_match_event_enabler(desc, enabler); |
983 | default: | |
984 | return -EINVAL; | |
985 | } | |
986 | } | |
987 | ||
988 | static | |
4e3b3630 JR |
989 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
990 | struct lttng_event *event) | |
e58095ef | 991 | { |
4e3b3630 JR |
992 | if (lttng_desc_match_enabler(event->desc, |
993 | lttng_event_enabler_as_enabler(event_enabler)) | |
994 | && event->chan == event_enabler->chan) | |
d970f72e MD |
995 | return 1; |
996 | else | |
997 | return 0; | |
e58095ef MD |
998 | } |
999 | ||
1000 | static | |
4e3b3630 JR |
1001 | int lttng_trigger_enabler_match_trigger( |
1002 | struct lttng_trigger_enabler *trigger_enabler, | |
1003 | struct lttng_trigger *trigger) | |
1004 | { | |
1005 | int desc_matches = lttng_desc_match_enabler(trigger->desc, | |
1006 | lttng_trigger_enabler_as_enabler(trigger_enabler)); | |
1007 | ||
1008 | if (desc_matches && trigger->group == trigger_enabler->group && | |
1009 | trigger->id == trigger_enabler->id) | |
1010 | return 1; | |
1011 | else | |
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | static | |
1016 | struct lttng_enabler_ref *lttng_enabler_ref( | |
1017 | struct cds_list_head *enabler_ref_list, | |
e58095ef MD |
1018 | struct lttng_enabler *enabler) |
1019 | { | |
1020 | struct lttng_enabler_ref *enabler_ref; | |
1021 | ||
4e3b3630 | 1022 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
e58095ef MD |
1023 | if (enabler_ref->ref == enabler) |
1024 | return enabler_ref; | |
1025 | } | |
1026 | return NULL; | |
1027 | } | |
1028 | ||
8020ceb5 | 1029 | /* |
e58095ef MD |
1030 | * Create struct lttng_event if it is missing and present in the list of |
1031 | * tracepoint probes. | |
8020ceb5 | 1032 | */ |
e58095ef | 1033 | static |
4e3b3630 | 1034 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1035 | { |
4e3b3630 | 1036 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1037 | struct lttng_probe_desc *probe_desc; |
1038 | const struct lttng_event_desc *desc; | |
1039 | struct lttng_event *event; | |
1040 | int i; | |
1041 | struct cds_list_head *probe_list; | |
1042 | ||
1043 | probe_list = lttng_get_probe_list_head(); | |
1044 | /* | |
1045 | * For each probe event, if we find that a probe event matches | |
1046 | * our enabler, create an associated lttng_event if not | |
1047 | * already present. | |
1048 | */ | |
1049 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1050 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
1051 | int ret; |
1052 | bool found = false; | |
d56fa719 MD |
1053 | struct cds_hlist_head *head; |
1054 | struct cds_hlist_node *node; | |
e58095ef MD |
1055 | |
1056 | desc = probe_desc->event_desc[i]; | |
4e3b3630 JR |
1057 | if (!lttng_desc_match_enabler(desc, |
1058 | lttng_event_enabler_as_enabler(event_enabler))) | |
e58095ef MD |
1059 | continue; |
1060 | ||
4e3b3630 JR |
1061 | head = borrow_hash_table_bucket( |
1062 | session->events_ht.table, | |
1063 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
1064 | ||
d56fa719 | 1065 | cds_hlist_for_each_entry(event, node, head, hlist) { |
d970f72e | 1066 | if (event->desc == desc |
4e3b3630 | 1067 | && event->chan == event_enabler->chan) { |
98a97f24 | 1068 | found = true; |
3140bffe FD |
1069 | break; |
1070 | } | |
e58095ef MD |
1071 | } |
1072 | if (found) | |
1073 | continue; | |
1074 | ||
1075 | /* | |
1076 | * We need to create an event for this | |
1077 | * event probe. | |
1078 | */ | |
1079 | ret = lttng_event_create(probe_desc->event_desc[i], | |
4e3b3630 | 1080 | event_enabler->chan); |
e58095ef | 1081 | if (ret) { |
32ce8569 MD |
1082 | DBG("Unable to create event %s, error %d\n", |
1083 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 1084 | } |
8165c8da | 1085 | } |
8020ceb5 | 1086 | } |
8020ceb5 MD |
1087 | } |
1088 | ||
4e3b3630 JR |
1089 | static |
1090 | void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc, | |
1091 | void (*event_func)(struct lttng_session *session, | |
1092 | struct lttng_event *event), | |
1093 | void (*trigger_func)(struct lttng_trigger *trigger)) | |
35ac38cb FD |
1094 | { |
1095 | struct cds_hlist_node *node, *tmp_node; | |
1096 | struct cds_list_head *sessionsp; | |
4e3b3630 | 1097 | unsigned int i; |
35ac38cb FD |
1098 | |
1099 | /* Get handle on list of sessions. */ | |
1100 | sessionsp = _lttng_get_sessions(); | |
1101 | ||
1102 | /* | |
4e3b3630 JR |
1103 | * Iterate over all events in the probe provider descriptions and |
1104 | * sessions to queue the unregistration of the events. | |
35ac38cb FD |
1105 | */ |
1106 | for (i = 0; i < provider_desc->nr_events; i++) { | |
1107 | const struct lttng_event_desc *event_desc; | |
4e3b3630 JR |
1108 | struct lttng_trigger_group *trigger_group; |
1109 | struct lttng_trigger *trigger; | |
1110 | struct lttng_session *session; | |
1111 | struct cds_hlist_head *head; | |
1112 | struct lttng_event *event; | |
35ac38cb FD |
1113 | |
1114 | event_desc = provider_desc->event_desc[i]; | |
35ac38cb | 1115 | |
4e3b3630 JR |
1116 | /* |
1117 | * Iterate over all session to find the current event | |
1118 | * description. | |
1119 | */ | |
35ac38cb FD |
1120 | cds_list_for_each_entry(session, sessionsp, node) { |
1121 | /* | |
4e3b3630 JR |
1122 | * Get the list of events in the hashtable bucket and |
1123 | * iterate to find the event matching this descriptor. | |
35ac38cb | 1124 | */ |
4e3b3630 JR |
1125 | head = borrow_hash_table_bucket( |
1126 | session->events_ht.table, | |
1127 | LTTNG_UST_EVENT_HT_SIZE, event_desc); | |
1128 | ||
1129 | cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) { | |
35ac38cb | 1130 | if (event_desc == event->desc) { |
4e3b3630 JR |
1131 | event_func(session, event); |
1132 | break; | |
1133 | } | |
1134 | } | |
1135 | } | |
1136 | ||
1137 | /* | |
1138 | * Iterate over all trigger groups to find the current event | |
1139 | * description. | |
1140 | */ | |
1141 | cds_list_for_each_entry(trigger_group, &trigger_groups, node) { | |
1142 | /* | |
1143 | * Get the list of triggers in the hashtable bucket and | |
1144 | * iterate to find the trigger matching this | |
1145 | * descriptor. | |
1146 | */ | |
1147 | head = borrow_hash_table_bucket( | |
1148 | trigger_group->triggers_ht.table, | |
1149 | LTTNG_UST_TRIGGER_HT_SIZE, event_desc); | |
1150 | ||
1151 | cds_hlist_for_each_entry_safe(trigger, node, tmp_node, head, hlist) { | |
1152 | if (event_desc == trigger->desc) { | |
1153 | trigger_func(trigger); | |
35ac38cb FD |
1154 | break; |
1155 | } | |
1156 | } | |
1157 | } | |
1158 | } | |
4e3b3630 JR |
1159 | } |
1160 | ||
1161 | static | |
1162 | void _unregister_event(struct lttng_session *session, | |
1163 | struct lttng_event *event) | |
1164 | { | |
1165 | _lttng_event_unregister(event); | |
1166 | } | |
1167 | ||
1168 | static | |
1169 | void _event_enum_destroy(struct lttng_session *session, | |
1170 | struct lttng_event *event) | |
1171 | { | |
1172 | unsigned int i; | |
1173 | ||
1174 | /* Destroy enums of the current event. */ | |
1175 | for (i = 0; i < event->desc->nr_fields; i++) { | |
1176 | const struct lttng_enum_desc *enum_desc; | |
1177 | const struct lttng_event_field *field; | |
1178 | struct lttng_enum *curr_enum; | |
1179 | ||
1180 | field = &(event->desc->fields[i]); | |
1181 | switch (field->type.atype) { | |
1182 | case atype_enum: | |
1183 | enum_desc = field->type.u.legacy.basic.enumeration.desc; | |
1184 | break; | |
1185 | case atype_enum_nestable: | |
1186 | enum_desc = field->type.u.enum_nestable.desc; | |
1187 | break; | |
1188 | default: | |
1189 | continue; | |
1190 | } | |
1191 | ||
1192 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); | |
1193 | if (curr_enum) { | |
1194 | _lttng_enum_destroy(curr_enum); | |
1195 | } | |
1196 | } | |
1197 | ||
1198 | /* Destroy event. */ | |
1199 | _lttng_event_destroy(event); | |
1200 | } | |
1201 | ||
1202 | /* | |
1203 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
1204 | * the probe provider descriptor received as argument. Must me called with the | |
1205 | * ust_lock held. | |
1206 | */ | |
1207 | void lttng_probe_provider_unregister_events( | |
1208 | struct lttng_probe_desc *provider_desc) | |
1209 | { | |
1210 | /* | |
1211 | * Iterate over all events in the probe provider descriptions and sessions | |
1212 | * to queue the unregistration of the events. | |
1213 | */ | |
1214 | probe_provider_event_for_each(provider_desc, _unregister_event, | |
1215 | _lttng_trigger_unregister); | |
35ac38cb FD |
1216 | |
1217 | /* Wait for grace period. */ | |
1218 | synchronize_trace(); | |
1219 | /* Prune the unregistration queue. */ | |
1220 | __tracepoint_probe_prune_release_queue(); | |
1221 | ||
1222 | /* | |
1223 | * It is now safe to destroy the events and remove them from the event list | |
1224 | * and hashtables. | |
1225 | */ | |
4e3b3630 JR |
1226 | probe_provider_event_for_each(provider_desc, _event_enum_destroy, |
1227 | _lttng_trigger_destroy); | |
35ac38cb FD |
1228 | } |
1229 | ||
8020ceb5 | 1230 | /* |
4e3b3630 | 1231 | * Create events associated with an event enabler (if not already present), |
e58095ef | 1232 | * and add backward reference from the event to the enabler. |
8020ceb5 MD |
1233 | */ |
1234 | static | |
4e3b3630 | 1235 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1236 | { |
4e3b3630 | 1237 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1238 | struct lttng_event *event; |
1239 | ||
4e3b3630 | 1240 | if (!lttng_event_enabler_as_enabler(event_enabler)->enabled) |
de713d8a FD |
1241 | goto end; |
1242 | ||
e58095ef | 1243 | /* First ensure that probe events are created for this enabler. */ |
4e3b3630 | 1244 | lttng_create_event_if_missing(event_enabler); |
e58095ef MD |
1245 | |
1246 | /* For each event matching enabler in session event list. */ | |
1247 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1248 | struct lttng_enabler_ref *enabler_ref; | |
1249 | ||
4e3b3630 | 1250 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
e58095ef MD |
1251 | continue; |
1252 | ||
4e3b3630 JR |
1253 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
1254 | lttng_event_enabler_as_enabler(event_enabler)); | |
e58095ef MD |
1255 | if (!enabler_ref) { |
1256 | /* | |
1257 | * If no backward ref, create it. | |
1258 | * Add backward ref from event to enabler. | |
1259 | */ | |
1260 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1261 | if (!enabler_ref) | |
1262 | return -ENOMEM; | |
4e3b3630 JR |
1263 | enabler_ref->ref = lttng_event_enabler_as_enabler( |
1264 | event_enabler); | |
e58095ef MD |
1265 | cds_list_add(&enabler_ref->node, |
1266 | &event->enablers_ref_head); | |
8165c8da | 1267 | } |
e58095ef MD |
1268 | |
1269 | /* | |
1270 | * Link filter bytecodes if not linked yet. | |
1271 | */ | |
4e3b3630 JR |
1272 | lttng_enabler_link_bytecode(event->desc, |
1273 | &session->ctx, | |
1274 | &event->filter_bytecode_runtime_head, | |
1275 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); | |
e58095ef MD |
1276 | |
1277 | /* TODO: merge event context. */ | |
1278 | } | |
de713d8a | 1279 | end: |
e58095ef MD |
1280 | return 0; |
1281 | } | |
1282 | ||
1283 | /* | |
1284 | * Called at library load: connect the probe on all enablers matching | |
1285 | * this event. | |
5f733922 | 1286 | * Called with session mutex held. |
e58095ef | 1287 | */ |
5f733922 | 1288 | int lttng_fix_pending_events(void) |
e58095ef MD |
1289 | { |
1290 | struct lttng_session *session; | |
1291 | ||
1292 | cds_list_for_each_entry(session, &sessions, node) { | |
4e3b3630 JR |
1293 | lttng_session_lazy_sync_event_enablers(session); |
1294 | } | |
1295 | return 0; | |
1296 | } | |
1297 | ||
1298 | int lttng_fix_pending_triggers(void) | |
1299 | { | |
1300 | struct lttng_trigger_group *trigger_group; | |
1301 | ||
1302 | cds_list_for_each_entry(trigger_group, &trigger_groups, node) { | |
1303 | lttng_trigger_group_sync_enablers(trigger_group); | |
8020ceb5 | 1304 | } |
e58095ef MD |
1305 | return 0; |
1306 | } | |
1307 | ||
246be17e | 1308 | /* |
37dddb65 MD |
1309 | * For each session of the owner thread, execute pending statedump. |
1310 | * Only dump state for the sessions owned by the caller thread, because | |
1311 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 1312 | */ |
3327ac33 | 1313 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
1314 | { |
1315 | struct lttng_session *session; | |
1316 | ||
37dddb65 | 1317 | /* Execute state dump */ |
cf73e0fe | 1318 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
1319 | |
1320 | /* Clear pending state dump */ | |
3327ac33 MD |
1321 | if (ust_lock()) { |
1322 | goto end; | |
1323 | } | |
246be17e | 1324 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
1325 | if (session->owner != owner) |
1326 | continue; | |
1327 | if (!session->statedump_pending) | |
1328 | continue; | |
1329 | session->statedump_pending = 0; | |
246be17e | 1330 | } |
3327ac33 | 1331 | end: |
37dddb65 | 1332 | ust_unlock(); |
3327ac33 | 1333 | return; |
246be17e PW |
1334 | } |
1335 | ||
e58095ef MD |
1336 | /* |
1337 | * Only used internally at session destruction. | |
1338 | */ | |
1339 | static | |
1340 | void _lttng_event_destroy(struct lttng_event *event) | |
1341 | { | |
1342 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1343 | ||
35ac38cb | 1344 | /* Remove from event list. */ |
e58095ef | 1345 | cds_list_del(&event->node); |
35ac38cb FD |
1346 | /* Remove from event hash table. */ |
1347 | cds_hlist_del(&event->hlist); | |
1348 | ||
8020ceb5 | 1349 | lttng_destroy_context(event->ctx); |
f488575f | 1350 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1351 | /* Free event enabler refs */ |
1352 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1353 | &event->enablers_ref_head, node) | |
1354 | free(enabler_ref); | |
b5234c06 | 1355 | free(event); |
8020ceb5 MD |
1356 | } |
1357 | ||
c785c634 MD |
1358 | static |
1359 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1360 | { | |
1361 | cds_list_del(&_enum->node); | |
35ac38cb | 1362 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1363 | free(_enum); |
1364 | } | |
1365 | ||
003fedf4 | 1366 | void lttng_ust_events_exit(void) |
8020ceb5 | 1367 | { |
7dd08bec | 1368 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1369 | |
e58095ef | 1370 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1371 | lttng_session_destroy(session); |
8020ceb5 | 1372 | } |
457a6b58 | 1373 | |
e58095ef MD |
1374 | /* |
1375 | * Enabler management. | |
1376 | */ | |
4e3b3630 JR |
1377 | struct lttng_event_enabler *lttng_event_enabler_create( |
1378 | enum lttng_enabler_format_type format_type, | |
e58095ef MD |
1379 | struct lttng_ust_event *event_param, |
1380 | struct lttng_channel *chan) | |
457a6b58 | 1381 | { |
4e3b3630 | 1382 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1383 | |
4e3b3630 JR |
1384 | event_enabler = zmalloc(sizeof(*event_enabler)); |
1385 | if (!event_enabler) | |
e58095ef | 1386 | return NULL; |
4e3b3630 JR |
1387 | event_enabler->base.format_type = format_type; |
1388 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1389 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); | |
1390 | memcpy(&event_enabler->base.event_param, event_param, | |
1391 | sizeof(event_enabler->base.event_param)); | |
1392 | event_enabler->chan = chan; | |
e58095ef | 1393 | /* ctx left NULL */ |
4e3b3630 JR |
1394 | event_enabler->base.enabled = 0; |
1395 | cds_list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); | |
1396 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1397 | ||
1398 | return event_enabler; | |
1399 | } | |
1400 | ||
1401 | struct lttng_trigger_enabler *lttng_trigger_enabler_create( | |
1402 | struct lttng_trigger_group *trigger_group, | |
1403 | enum lttng_enabler_format_type format_type, | |
1404 | struct lttng_ust_trigger *trigger_param) | |
1405 | { | |
1406 | struct lttng_trigger_enabler *trigger_enabler; | |
1407 | ||
1408 | trigger_enabler = zmalloc(sizeof(*trigger_enabler)); | |
1409 | if (!trigger_enabler) | |
1410 | return NULL; | |
1411 | trigger_enabler->base.format_type = format_type; | |
1412 | CDS_INIT_LIST_HEAD(&trigger_enabler->base.filter_bytecode_head); | |
1413 | CDS_INIT_LIST_HEAD(&trigger_enabler->capture_bytecode_head); | |
1414 | CDS_INIT_LIST_HEAD(&trigger_enabler->base.excluder_head); | |
1415 | ||
1416 | trigger_enabler->id = trigger_param->id; | |
1417 | trigger_enabler->num_captures = 0; | |
1418 | ||
1419 | memcpy(&trigger_enabler->base.event_param.name, trigger_param->name, | |
1420 | sizeof(trigger_enabler->base.event_param.name)); | |
1421 | trigger_enabler->base.event_param.instrumentation = trigger_param->instrumentation; | |
1422 | trigger_enabler->base.event_param.loglevel = trigger_param->loglevel; | |
1423 | trigger_enabler->base.event_param.loglevel_type = trigger_param->loglevel_type; | |
1424 | ||
1425 | trigger_enabler->base.enabled = 0; | |
1426 | trigger_enabler->group = trigger_group; | |
1427 | ||
1428 | cds_list_add(&trigger_enabler->node, &trigger_group->enablers_head); | |
1429 | ||
1430 | lttng_trigger_group_sync_enablers(trigger_group); | |
1431 | ||
1432 | return trigger_enabler; | |
457a6b58 MD |
1433 | } |
1434 | ||
4e3b3630 | 1435 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1436 | { |
4e3b3630 JR |
1437 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
1438 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1439 | ||
e58095ef | 1440 | return 0; |
457a6b58 | 1441 | } |
457a6b58 | 1442 | |
4e3b3630 | 1443 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1444 | { |
4e3b3630 JR |
1445 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1446 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1447 | ||
e58095ef MD |
1448 | return 0; |
1449 | } | |
457a6b58 | 1450 | |
4e3b3630 JR |
1451 | static |
1452 | void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, | |
1453 | struct lttng_ust_bytecode_node *bytecode) | |
e58095ef MD |
1454 | { |
1455 | bytecode->enabler = enabler; | |
1456 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
4e3b3630 JR |
1457 | } |
1458 | ||
1459 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, | |
1460 | struct lttng_ust_bytecode_node *bytecode) | |
1461 | { | |
1462 | _lttng_enabler_attach_filter_bytecode( | |
1463 | lttng_event_enabler_as_enabler(event_enabler), bytecode); | |
1464 | ||
1465 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
e58095ef | 1466 | return 0; |
0bfb5cbd JI |
1467 | } |
1468 | ||
4e3b3630 JR |
1469 | static |
1470 | void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
0bfb5cbd JI |
1471 | struct lttng_ust_excluder_node *excluder) |
1472 | { | |
1473 | excluder->enabler = enabler; | |
1474 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
4e3b3630 JR |
1475 | } |
1476 | ||
1477 | int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler, | |
1478 | struct lttng_ust_excluder_node *excluder) | |
1479 | { | |
1480 | _lttng_enabler_attach_exclusion( | |
1481 | lttng_event_enabler_as_enabler(event_enabler), excluder); | |
1482 | ||
1483 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1484 | return 0; | |
1485 | } | |
1486 | ||
1487 | int lttng_trigger_enabler_enable(struct lttng_trigger_enabler *trigger_enabler) | |
1488 | { | |
1489 | lttng_trigger_enabler_as_enabler(trigger_enabler)->enabled = 1; | |
1490 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
1491 | ||
1492 | return 0; | |
1493 | } | |
1494 | ||
1495 | int lttng_trigger_enabler_disable(struct lttng_trigger_enabler *trigger_enabler) | |
1496 | { | |
1497 | lttng_trigger_enabler_as_enabler(trigger_enabler)->enabled = 0; | |
1498 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
1499 | ||
1500 | return 0; | |
1501 | } | |
1502 | ||
1503 | int lttng_trigger_enabler_attach_filter_bytecode( | |
1504 | struct lttng_trigger_enabler *trigger_enabler, | |
1505 | struct lttng_ust_bytecode_node *bytecode) | |
1506 | { | |
1507 | _lttng_enabler_attach_filter_bytecode( | |
1508 | lttng_trigger_enabler_as_enabler(trigger_enabler), bytecode); | |
1509 | ||
1510 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
1511 | return 0; | |
1512 | } | |
1513 | ||
1514 | int lttng_trigger_enabler_attach_capture_bytecode( | |
1515 | struct lttng_trigger_enabler *trigger_enabler, | |
1516 | struct lttng_ust_bytecode_node *bytecode) | |
1517 | { | |
1518 | bytecode->enabler = lttng_trigger_enabler_as_enabler(trigger_enabler); | |
1519 | cds_list_add_tail(&bytecode->node, &trigger_enabler->capture_bytecode_head); | |
1520 | trigger_enabler->num_captures++; | |
1521 | ||
1522 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
1523 | return 0; | |
1524 | } | |
1525 | ||
1526 | int lttng_trigger_enabler_attach_exclusion( | |
1527 | struct lttng_trigger_enabler *trigger_enabler, | |
1528 | struct lttng_ust_excluder_node *excluder) | |
1529 | { | |
1530 | _lttng_enabler_attach_exclusion( | |
1531 | lttng_trigger_enabler_as_enabler(trigger_enabler), excluder); | |
1532 | ||
1533 | lttng_trigger_group_sync_enablers(trigger_enabler->group); | |
0bfb5cbd | 1534 | return 0; |
e58095ef | 1535 | } |
f488575f | 1536 | |
e58095ef | 1537 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1538 | union ust_args *uargs, |
e58095ef MD |
1539 | struct lttng_ctx **ctx, struct lttng_session *session) |
1540 | { | |
457a6b58 | 1541 | /* |
e58095ef MD |
1542 | * We cannot attach a context after trace has been started for a |
1543 | * session because the metadata does not allow expressing this | |
1544 | * information outside of the original channel scope. | |
457a6b58 | 1545 | */ |
e58095ef MD |
1546 | if (session->been_active) |
1547 | return -EPERM; | |
457a6b58 | 1548 | |
e58095ef MD |
1549 | switch (context_param->ctx) { |
1550 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1551 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1552 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1553 | { | |
1554 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1555 | ||
1556 | perf_ctx_param = &context_param->u.perf_counter; | |
1557 | return lttng_add_perf_counter_to_ctx( | |
1558 | perf_ctx_param->type, | |
1559 | perf_ctx_param->config, | |
1560 | perf_ctx_param->name, | |
1561 | ctx); | |
1562 | } | |
e58095ef MD |
1563 | case LTTNG_UST_CONTEXT_VTID: |
1564 | return lttng_add_vtid_to_ctx(ctx); | |
1565 | case LTTNG_UST_CONTEXT_VPID: | |
1566 | return lttng_add_vpid_to_ctx(ctx); | |
1567 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1568 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1569 | case LTTNG_UST_CONTEXT_IP: |
1570 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1571 | case LTTNG_UST_CONTEXT_CPU_ID: |
1572 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1573 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1574 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1575 | ctx); | |
735bef47 MJ |
1576 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1577 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1578 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1579 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1580 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1581 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1582 | case LTTNG_UST_CONTEXT_NET_NS: | |
1583 | return lttng_add_net_ns_to_ctx(ctx); | |
1584 | case LTTNG_UST_CONTEXT_PID_NS: | |
1585 | return lttng_add_pid_ns_to_ctx(ctx); | |
cefef7a7 MJ |
1586 | case LTTNG_UST_CONTEXT_TIME_NS: |
1587 | return lttng_add_time_ns_to_ctx(ctx); | |
735bef47 MJ |
1588 | case LTTNG_UST_CONTEXT_USER_NS: |
1589 | return lttng_add_user_ns_to_ctx(ctx); | |
1590 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1591 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1592 | case LTTNG_UST_CONTEXT_VUID: |
1593 | return lttng_add_vuid_to_ctx(ctx); | |
1594 | case LTTNG_UST_CONTEXT_VEUID: | |
1595 | return lttng_add_veuid_to_ctx(ctx); | |
1596 | case LTTNG_UST_CONTEXT_VSUID: | |
1597 | return lttng_add_vsuid_to_ctx(ctx); | |
1598 | case LTTNG_UST_CONTEXT_VGID: | |
1599 | return lttng_add_vgid_to_ctx(ctx); | |
1600 | case LTTNG_UST_CONTEXT_VEGID: | |
1601 | return lttng_add_vegid_to_ctx(ctx); | |
1602 | case LTTNG_UST_CONTEXT_VSGID: | |
1603 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1604 | default: |
1605 | return -EINVAL; | |
457a6b58 | 1606 | } |
457a6b58 MD |
1607 | } |
1608 | ||
4e3b3630 | 1609 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
e58095ef | 1610 | struct lttng_ust_context *context_param) |
457a6b58 | 1611 | { |
e58095ef | 1612 | return -ENOSYS; |
457a6b58 MD |
1613 | } |
1614 | ||
4e3b3630 | 1615 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1616 | { |
4e3b3630 JR |
1617 | if (!event_enabler) { |
1618 | return; | |
0f63324a | 1619 | } |
4e3b3630 | 1620 | cds_list_del(&event_enabler->node); |
0f63324a | 1621 | |
4e3b3630 | 1622 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef | 1623 | |
4e3b3630 JR |
1624 | lttng_destroy_context(event_enabler->ctx); |
1625 | free(event_enabler); | |
457a6b58 MD |
1626 | } |
1627 | ||
e58095ef | 1628 | /* |
4e3b3630 | 1629 | * lttng_session_sync_event_enablers should be called just before starting a |
e58095ef MD |
1630 | * session. |
1631 | */ | |
457a6b58 | 1632 | static |
4e3b3630 | 1633 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1634 | { |
4e3b3630 | 1635 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1636 | struct lttng_event *event; |
457a6b58 | 1637 | |
4e3b3630 JR |
1638 | cds_list_for_each_entry(event_enabler, &session->enablers_head, node) |
1639 | lttng_event_enabler_ref_events(event_enabler); | |
e58095ef MD |
1640 | /* |
1641 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1642 | * and its channel and session transient states are enabled, we |
1643 | * enable the event, else we disable it. | |
e58095ef MD |
1644 | */ |
1645 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1646 | struct lttng_enabler_ref *enabler_ref; | |
1647 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1648 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1649 | |
1650 | /* Enable events */ | |
1651 | cds_list_for_each_entry(enabler_ref, | |
1652 | &event->enablers_ref_head, node) { | |
1653 | if (enabler_ref->ref->enabled) { | |
1654 | enabled = 1; | |
1655 | break; | |
1656 | } | |
1657 | } | |
ac6b4ac6 MD |
1658 | /* |
1659 | * Enabled state is based on union of enablers, with | |
1660 | * intesection of session and channel transient enable | |
1661 | * states. | |
1662 | */ | |
1663 | enabled = enabled && session->tstate && event->chan->tstate; | |
1664 | ||
1665 | CMM_STORE_SHARED(event->enabled, enabled); | |
1666 | /* | |
1667 | * Sync tracepoint registration with event enabled | |
1668 | * state. | |
1669 | */ | |
1670 | if (enabled) { | |
1671 | if (!event->registered) | |
1672 | register_event(event); | |
1673 | } else { | |
1674 | if (event->registered) | |
1675 | unregister_event(event); | |
1676 | } | |
457a6b58 | 1677 | |
1f49fc05 | 1678 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1679 | cds_list_for_each_entry(enabler_ref, |
1680 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1681 | if (enabler_ref->ref->enabled |
1682 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1683 | has_enablers_without_bytecode = 1; |
1684 | break; | |
1685 | } | |
1686 | } | |
1687 | event->has_enablers_without_bytecode = | |
1688 | has_enablers_without_bytecode; | |
1689 | ||
e58095ef MD |
1690 | /* Enable filters */ |
1691 | cds_list_for_each_entry(runtime, | |
4e3b3630 JR |
1692 | &event->filter_bytecode_runtime_head, node) { |
1693 | lttng_bytecode_filter_sync_state(runtime); | |
1694 | } | |
1695 | } | |
1696 | __tracepoint_probe_prune_release_queue(); | |
1697 | } | |
1698 | ||
1699 | static | |
1700 | void lttng_create_trigger_if_missing(struct lttng_trigger_enabler *trigger_enabler) | |
1701 | { | |
1702 | struct lttng_trigger_group *trigger_group = trigger_enabler->group; | |
1703 | struct lttng_probe_desc *probe_desc; | |
1704 | struct cds_list_head *probe_list; | |
1705 | int i; | |
1706 | ||
1707 | probe_list = lttng_get_probe_list_head(); | |
1708 | ||
1709 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1710 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1711 | int ret; | |
1712 | bool found = false; | |
1713 | const struct lttng_event_desc *desc; | |
1714 | struct lttng_trigger *trigger; | |
1715 | struct cds_hlist_head *head; | |
1716 | struct cds_hlist_node *node; | |
1717 | ||
1718 | desc = probe_desc->event_desc[i]; | |
1719 | ||
1720 | if (!lttng_desc_match_enabler(desc, | |
1721 | lttng_trigger_enabler_as_enabler(trigger_enabler))) | |
1722 | continue; | |
1723 | ||
1724 | /* | |
1725 | * Given the current trigger group, get the bucket that | |
1726 | * the target trigger would be if it was already | |
1727 | * created. | |
1728 | */ | |
1729 | head = borrow_hash_table_bucket( | |
1730 | trigger_group->triggers_ht.table, | |
1731 | LTTNG_UST_TRIGGER_HT_SIZE, desc); | |
1732 | ||
1733 | cds_hlist_for_each_entry(trigger, node, head, hlist) { | |
1734 | /* | |
1735 | * Check if trigger already exists by checking | |
1736 | * if the trigger and enabler share the same | |
1737 | * description and id. | |
1738 | */ | |
1739 | if (trigger->desc == desc && | |
1740 | trigger->id == trigger_enabler->id) { | |
1741 | found = true; | |
1742 | break; | |
1743 | } | |
1744 | } | |
1745 | ||
1746 | if (found) | |
1747 | continue; | |
1748 | ||
1749 | /* | |
1750 | * We need to create a trigger for this event probe. | |
1751 | */ | |
1752 | ret = lttng_trigger_create(desc, trigger_enabler->id, | |
1753 | trigger_enabler->error_counter_index, | |
1754 | trigger_group); | |
1755 | if (ret) { | |
1756 | DBG("Unable to create trigger %s, error %d\n", | |
1757 | probe_desc->event_desc[i]->name, ret); | |
1758 | } | |
1759 | } | |
1760 | } | |
1761 | } | |
1762 | ||
1763 | /* | |
1764 | * Create triggers associated with a trigger enabler (if not already present). | |
1765 | */ | |
1766 | static | |
1767 | int lttng_trigger_enabler_ref_triggers(struct lttng_trigger_enabler *trigger_enabler) | |
1768 | { | |
1769 | struct lttng_trigger_group *trigger_group = trigger_enabler->group; | |
1770 | struct lttng_trigger *trigger; | |
1771 | ||
1772 | /* | |
1773 | * Only try to create triggers for enablers that are enabled, the user | |
1774 | * might still be attaching filter or exclusion to the | |
1775 | * trigger_enabler. | |
1776 | */ | |
1777 | if (!lttng_trigger_enabler_as_enabler(trigger_enabler)->enabled) | |
1778 | goto end; | |
1779 | ||
1780 | /* First, ensure that probe triggers are created for this enabler. */ | |
1781 | lttng_create_trigger_if_missing(trigger_enabler); | |
1782 | ||
1783 | /* Link the created trigger with its associated enabler. */ | |
1784 | cds_list_for_each_entry(trigger, &trigger_group->triggers_head, node) { | |
1785 | struct lttng_enabler_ref *enabler_ref; | |
1786 | ||
1787 | if (!lttng_trigger_enabler_match_trigger(trigger_enabler, trigger)) | |
1788 | continue; | |
1789 | ||
1790 | enabler_ref = lttng_enabler_ref(&trigger->enablers_ref_head, | |
1791 | lttng_trigger_enabler_as_enabler(trigger_enabler)); | |
1792 | if (!enabler_ref) { | |
1793 | /* | |
1794 | * If no backward ref, create it. | |
1795 | * Add backward ref from trigger to enabler. | |
1796 | */ | |
1797 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1798 | if (!enabler_ref) | |
1799 | return -ENOMEM; | |
1800 | ||
1801 | enabler_ref->ref = lttng_trigger_enabler_as_enabler( | |
1802 | trigger_enabler); | |
1803 | cds_list_add(&enabler_ref->node, | |
1804 | &trigger->enablers_ref_head); | |
1805 | } | |
1806 | ||
1807 | /* | |
1808 | * Link filter bytecodes if not linked yet. | |
1809 | */ | |
1810 | lttng_enabler_link_bytecode(trigger->desc, | |
1811 | &trigger_group->ctx, &trigger->filter_bytecode_runtime_head, | |
1812 | <tng_trigger_enabler_as_enabler(trigger_enabler)->filter_bytecode_head); | |
1813 | ||
1814 | /* | |
1815 | * Link capture bytecodes if not linked yet. | |
1816 | */ | |
1817 | lttng_enabler_link_bytecode(trigger->desc, | |
1818 | &trigger_group->ctx, &trigger->capture_bytecode_runtime_head, | |
1819 | &trigger_enabler->capture_bytecode_head); | |
1820 | trigger->num_captures = trigger_enabler->num_captures; | |
1821 | } | |
1822 | end: | |
1823 | return 0; | |
1824 | } | |
1825 | ||
1826 | static | |
1827 | void lttng_trigger_group_sync_enablers(struct lttng_trigger_group *trigger_group) | |
1828 | { | |
1829 | struct lttng_trigger_enabler *trigger_enabler; | |
1830 | struct lttng_trigger *trigger; | |
1831 | ||
1832 | cds_list_for_each_entry(trigger_enabler, &trigger_group->enablers_head, node) | |
1833 | lttng_trigger_enabler_ref_triggers(trigger_enabler); | |
1834 | ||
1835 | /* | |
1836 | * For each trigger, if at least one of its enablers is enabled, | |
1837 | * we enable the trigger, else we disable it. | |
1838 | */ | |
1839 | cds_list_for_each_entry(trigger, &trigger_group->triggers_head, node) { | |
1840 | struct lttng_enabler_ref *enabler_ref; | |
1841 | struct lttng_bytecode_runtime *runtime; | |
1842 | int enabled = 0, has_enablers_without_bytecode = 0; | |
1843 | ||
1844 | /* Enable triggers */ | |
1845 | cds_list_for_each_entry(enabler_ref, | |
1846 | &trigger->enablers_ref_head, node) { | |
1847 | if (enabler_ref->ref->enabled) { | |
1848 | enabled = 1; | |
1849 | break; | |
1850 | } | |
1851 | } | |
1852 | ||
1853 | CMM_STORE_SHARED(trigger->enabled, enabled); | |
1854 | /* | |
1855 | * Sync tracepoint registration with trigger enabled | |
1856 | * state. | |
1857 | */ | |
1858 | if (enabled) { | |
1859 | if (!trigger->registered) | |
1860 | register_trigger(trigger); | |
1861 | } else { | |
1862 | if (trigger->registered) | |
1863 | unregister_trigger(trigger); | |
1864 | } | |
1865 | ||
1866 | /* Check if has enablers without bytecode enabled */ | |
1867 | cds_list_for_each_entry(enabler_ref, | |
1868 | &trigger->enablers_ref_head, node) { | |
1869 | if (enabler_ref->ref->enabled | |
1870 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1871 | has_enablers_without_bytecode = 1; | |
1872 | break; | |
1873 | } | |
1874 | } | |
1875 | trigger->has_enablers_without_bytecode = | |
1876 | has_enablers_without_bytecode; | |
1877 | ||
1878 | /* Enable filters */ | |
1879 | cds_list_for_each_entry(runtime, | |
1880 | &trigger->filter_bytecode_runtime_head, node) { | |
1881 | lttng_bytecode_filter_sync_state(runtime); | |
1882 | } | |
1883 | ||
1884 | /* Enable captures. */ | |
1885 | cds_list_for_each_entry(runtime, | |
1886 | &trigger->capture_bytecode_runtime_head, node) { | |
1887 | lttng_bytecode_capture_sync_state(runtime); | |
457a6b58 MD |
1888 | } |
1889 | } | |
baa1e0bc | 1890 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1891 | } |
1892 | ||
e58095ef MD |
1893 | /* |
1894 | * Apply enablers to session events, adding events to session if need | |
1895 | * be. It is required after each modification applied to an active | |
1896 | * session, and right before session "start". | |
1897 | * "lazy" sync means we only sync if required. | |
1898 | */ | |
1899 | static | |
4e3b3630 | 1900 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1901 | { |
e58095ef MD |
1902 | /* We can skip if session is not active */ |
1903 | if (!session->active) | |
1904 | return; | |
4e3b3630 | 1905 | lttng_session_sync_event_enablers(session); |
457a6b58 | 1906 | } |
53569322 MD |
1907 | |
1908 | /* | |
1909 | * Update all sessions with the given app context. | |
1910 | * Called with ust lock held. | |
1911 | * This is invoked when an application context gets loaded/unloaded. It | |
1912 | * ensures the context callbacks are in sync with the application | |
1913 | * context (either app context callbacks, or dummy callbacks). | |
1914 | */ | |
1915 | void lttng_ust_context_set_session_provider(const char *name, | |
1916 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1917 | void (*record)(struct lttng_ctx_field *field, | |
1918 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1919 | struct lttng_channel *chan), | |
1920 | void (*get_value)(struct lttng_ctx_field *field, | |
1921 | struct lttng_ctx_value *value)) | |
1922 | { | |
1923 | struct lttng_session *session; | |
1924 | ||
1925 | cds_list_for_each_entry(session, &sessions, node) { | |
1926 | struct lttng_channel *chan; | |
1927 | struct lttng_event *event; | |
1928 | int ret; | |
1929 | ||
1930 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1931 | name, get_size, record, get_value); | |
1932 | if (ret) | |
1933 | abort(); | |
1934 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1935 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1936 | name, get_size, record, get_value); | |
1937 | if (ret) | |
1938 | abort(); | |
1939 | } | |
1940 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1941 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1942 | name, get_size, record, get_value); | |
1943 | if (ret) | |
1944 | abort(); | |
1945 | } | |
1946 | } | |
1947 | } | |
4e3b3630 JR |
1948 | |
1949 | /* | |
1950 | * Update all trigger groups with the given app context. | |
1951 | * Called with ust lock held. | |
1952 | * This is invoked when an application context gets loaded/unloaded. It | |
1953 | * ensures the context callbacks are in sync with the application | |
1954 | * context (either app context callbacks, or dummy callbacks). | |
1955 | */ | |
1956 | void lttng_ust_context_set_trigger_group_provider(const char *name, | |
1957 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1958 | void (*record)(struct lttng_ctx_field *field, | |
1959 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1960 | struct lttng_channel *chan), | |
1961 | void (*get_value)(struct lttng_ctx_field *field, | |
1962 | struct lttng_ctx_value *value)) | |
1963 | { | |
1964 | struct lttng_trigger_group *trigger_group; | |
1965 | ||
1966 | cds_list_for_each_entry(trigger_group, &trigger_groups, node) { | |
1967 | int ret; | |
1968 | ||
1969 | ret = lttng_ust_context_set_provider_rcu(&trigger_group->ctx, | |
1970 | name, get_size, record, get_value); | |
1971 | if (ret) | |
1972 | abort(); | |
1973 | } | |
1974 | } |