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 | ||
3fbec7dc | 23 | #define _LGPL_SOURCE |
b5234c06 | 24 | #include <stdio.h> |
d8d2416d | 25 | #include <assert.h> |
b5234c06 | 26 | #include <errno.h> |
d8d2416d FD |
27 | #include <limits.h> |
28 | #include <pthread.h> | |
f4681817 MD |
29 | #include <sys/shm.h> |
30 | #include <sys/ipc.h> | |
44c72f10 MD |
31 | #include <stdint.h> |
32 | #include <stddef.h> | |
28b12049 MD |
33 | #include <inttypes.h> |
34 | #include <time.h> | |
196ec2df | 35 | #include <stdbool.h> |
d8d2416d | 36 | #include <unistd.h> |
2ae57758 | 37 | #include <lttng/ust-endian.h> |
44c72f10 MD |
38 | |
39 | #include <urcu-bp.h> | |
d8d2416d | 40 | #include <urcu/arch.h> |
44c72f10 | 41 | #include <urcu/compiler.h> |
d8d2416d FD |
42 | #include <urcu/hlist.h> |
43 | #include <urcu/list.h> | |
44c72f10 | 44 | #include <urcu/uatomic.h> |
44c72f10 MD |
45 | |
46 | #include <lttng/tracepoint.h> | |
4318ae1b | 47 | #include <lttng/ust-events.h> |
44c72f10 MD |
48 | |
49 | #include <usterr-signal-safe.h> | |
50 | #include <helper.h> | |
7d3e35b6 | 51 | #include <lttng/ust-ctl.h> |
32ce8569 | 52 | #include <ust-comm.h> |
d8d2416d | 53 | #include <ust-fd.h> |
53569322 MD |
54 | #include <lttng/ust-dynamic-type.h> |
55 | #include <lttng/ust-context-provider.h> | |
1f18504e | 56 | #include "error.h" |
08114193 | 57 | #include "compat.h" |
eda498b8 | 58 | #include "lttng-ust-uuid.h" |
44c72f10 | 59 | |
457a6b58 | 60 | #include "tracepoint-internal.h" |
196ec2df | 61 | #include "string-utils.h" |
7dd08bec MD |
62 | #include "lttng-tracer.h" |
63 | #include "lttng-tracer-core.h" | |
cf73e0fe | 64 | #include "lttng-ust-statedump.h" |
d871c65b | 65 | #include "ust-events-internal.h" |
b728d87e | 66 | #include "wait.h" |
8d8a24c8 | 67 | #include "../libringbuffer/shm.h" |
596c4223 | 68 | #include "jhash.h" |
d8d2416d | 69 | #include <lttng/ust-abi.h> |
8165c8da MD |
70 | |
71 | /* | |
3327ac33 MD |
72 | * All operations within this file are called by the communication |
73 | * thread, under ust_lock protection. | |
8165c8da | 74 | */ |
8165c8da | 75 | |
b5234c06 | 76 | static CDS_LIST_HEAD(sessions); |
d8d2416d | 77 | static CDS_LIST_HEAD(event_notifier_groups); |
8165c8da | 78 | |
37dddb65 MD |
79 | struct cds_list_head *_lttng_get_sessions(void) |
80 | { | |
81 | return &sessions; | |
82 | } | |
83 | ||
7dd08bec | 84 | static void _lttng_event_destroy(struct lttng_event *event); |
d8d2416d FD |
85 | static void _lttng_event_notifier_destroy( |
86 | struct lttng_event_notifier *event_notifier); | |
c785c634 | 87 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 88 | |
e58095ef | 89 | static |
d871c65b | 90 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
e58095ef | 91 | static |
d871c65b | 92 | void lttng_session_sync_event_enablers(struct lttng_session *session); |
e58095ef | 93 | static |
d8d2416d FD |
94 | void lttng_event_notifier_group_sync_enablers( |
95 | struct lttng_event_notifier_group *event_notifier_group); | |
96 | static | |
e58095ef MD |
97 | void lttng_enabler_destroy(struct lttng_enabler *enabler); |
98 | ||
6715d7d1 MD |
99 | /* |
100 | * Called with ust lock held. | |
101 | */ | |
102 | int lttng_session_active(void) | |
103 | { | |
104 | struct lttng_session *iter; | |
105 | ||
106 | cds_list_for_each_entry(iter, &sessions, node) { | |
107 | if (iter->active) | |
108 | return 1; | |
109 | } | |
110 | return 0; | |
111 | } | |
112 | ||
e58095ef MD |
113 | static |
114 | int lttng_loglevel_match(int loglevel, | |
115 | unsigned int has_loglevel, | |
457a6b58 MD |
116 | enum lttng_ust_loglevel_type req_type, |
117 | int req_loglevel) | |
118 | { | |
e58095ef MD |
119 | if (!has_loglevel) |
120 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
121 | switch (req_type) { |
122 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 123 | if (loglevel <= req_loglevel |
67ada458 | 124 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
125 | return 1; |
126 | else | |
127 | return 0; | |
128 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 129 | if (loglevel == req_loglevel |
67ada458 | 130 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
131 | return 1; |
132 | else | |
133 | return 0; | |
134 | case LTTNG_UST_LOGLEVEL_ALL: | |
135 | default: | |
67ada458 | 136 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
137 | return 1; |
138 | else | |
139 | return 0; | |
457a6b58 MD |
140 | } |
141 | } | |
142 | ||
8020ceb5 MD |
143 | void synchronize_trace(void) |
144 | { | |
8020ceb5 | 145 | synchronize_rcu(); |
8020ceb5 MD |
146 | } |
147 | ||
7dd08bec | 148 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 149 | { |
7dd08bec | 150 | struct lttng_session *session; |
74d81a6c | 151 | int i; |
8020ceb5 | 152 | |
7dd08bec | 153 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
154 | if (!session) |
155 | return NULL; | |
53569322 MD |
156 | if (lttng_session_context_init(&session->ctx)) { |
157 | free(session); | |
158 | return NULL; | |
159 | } | |
e58095ef MD |
160 | CDS_INIT_LIST_HEAD(&session->chan_head); |
161 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 162 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 163 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
164 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
165 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
166 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
167 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 168 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
169 | return session; |
170 | } | |
171 | ||
d8d2416d FD |
172 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
173 | { | |
174 | struct lttng_event_notifier_group *event_notifier_group; | |
175 | int i; | |
176 | ||
177 | event_notifier_group = zmalloc(sizeof(struct lttng_event_notifier_group)); | |
178 | if (!event_notifier_group) | |
179 | return NULL; | |
180 | ||
181 | CDS_INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
182 | CDS_INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
183 | for (i = 0; i < LTTNG_UST_EVENT_NOTIFIER_HT_SIZE; i++) | |
184 | CDS_INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
185 | ||
186 | cds_list_add(&event_notifier_group->node, &event_notifier_groups); | |
187 | ||
188 | return event_notifier_group; | |
189 | } | |
190 | ||
74d81a6c MD |
191 | /* |
192 | * Only used internally at session destruction. | |
193 | */ | |
194 | static | |
195 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
196 | { | |
197 | struct channel *chan; | |
198 | struct lttng_ust_shm_handle *handle; | |
199 | ||
200 | cds_list_del(<tng_chan->node); | |
201 | lttng_destroy_context(lttng_chan->ctx); | |
202 | chan = lttng_chan->chan; | |
203 | handle = lttng_chan->handle; | |
204 | /* | |
205 | * note: lttng_chan is private data contained within handle. It | |
206 | * will be freed along with the handle. | |
207 | */ | |
208 | channel_destroy(chan, handle, 0); | |
209 | } | |
210 | ||
ac6b4ac6 MD |
211 | static |
212 | void register_event(struct lttng_event *event) | |
213 | { | |
214 | int ret; | |
215 | const struct lttng_event_desc *desc; | |
216 | ||
217 | assert(event->registered == 0); | |
218 | desc = event->desc; | |
baa1e0bc | 219 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
220 | desc->probe_callback, |
221 | event, desc->signature); | |
222 | WARN_ON_ONCE(ret); | |
223 | if (!ret) | |
224 | event->registered = 1; | |
225 | } | |
226 | ||
d8d2416d FD |
227 | static |
228 | void register_event_notifier(struct lttng_event_notifier *event_notifier) | |
229 | { | |
230 | int ret; | |
231 | const struct lttng_event_desc *desc; | |
232 | ||
233 | assert(event_notifier->registered == 0); | |
234 | desc = event_notifier->desc; | |
235 | ret = __tracepoint_probe_register_queue_release(desc->name, | |
236 | desc->u.ext.event_notifier_callback, event_notifier, desc->signature); | |
237 | WARN_ON_ONCE(ret); | |
238 | if (!ret) | |
239 | event_notifier->registered = 1; | |
240 | } | |
241 | ||
ac6b4ac6 MD |
242 | static |
243 | void unregister_event(struct lttng_event *event) | |
244 | { | |
245 | int ret; | |
246 | const struct lttng_event_desc *desc; | |
247 | ||
248 | assert(event->registered == 1); | |
249 | desc = event->desc; | |
baa1e0bc | 250 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
251 | desc->probe_callback, |
252 | event); | |
253 | WARN_ON_ONCE(ret); | |
254 | if (!ret) | |
255 | event->registered = 0; | |
256 | } | |
257 | ||
d8d2416d FD |
258 | static |
259 | void unregister_event_notifier(struct lttng_event_notifier *event_notifier) | |
260 | { | |
261 | int ret; | |
262 | const struct lttng_event_desc *desc; | |
263 | ||
264 | assert(event_notifier->registered == 1); | |
265 | desc = event_notifier->desc; | |
266 | ret = __tracepoint_probe_unregister_queue_release(desc->name, | |
267 | desc->u.ext.event_notifier_callback, event_notifier); | |
268 | WARN_ON_ONCE(ret); | |
269 | if (!ret) | |
270 | event_notifier->registered = 0; | |
271 | } | |
272 | ||
ac6b4ac6 MD |
273 | /* |
274 | * Only used internally at session destruction. | |
275 | */ | |
276 | static | |
277 | void _lttng_event_unregister(struct lttng_event *event) | |
278 | { | |
279 | if (event->registered) | |
280 | unregister_event(event); | |
281 | } | |
282 | ||
d8d2416d FD |
283 | /* |
284 | * Only used internally at session destruction. | |
285 | */ | |
286 | static | |
287 | void _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier) | |
288 | { | |
289 | if (event_notifier->registered) | |
290 | unregister_event_notifier(event_notifier); | |
291 | } | |
292 | ||
7dd08bec | 293 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 294 | { |
7dd08bec MD |
295 | struct lttng_channel *chan, *tmpchan; |
296 | struct lttng_event *event, *tmpevent; | |
c785c634 | 297 | struct lttng_enum *_enum, *tmp_enum; |
d871c65b | 298 | struct lttng_event_enabler *event_enabler, *event_tmpenabler; |
8020ceb5 | 299 | |
b5234c06 | 300 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 301 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 302 | _lttng_event_unregister(event); |
8020ceb5 MD |
303 | } |
304 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
baa1e0bc | 305 | __tracepoint_probe_prune_release_queue(); |
d871c65b | 306 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
e58095ef | 307 | &session->enablers_head, node) |
d871c65b | 308 | lttng_event_enabler_destroy(event_enabler); |
e58095ef MD |
309 | cds_list_for_each_entry_safe(event, tmpevent, |
310 | &session->events_head, node) | |
7dd08bec | 311 | _lttng_event_destroy(event); |
c785c634 MD |
312 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
313 | &session->enums_head, node) | |
314 | _lttng_enum_destroy(_enum); | |
e58095ef | 315 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 316 | _lttng_channel_unmap(chan); |
e58095ef | 317 | cds_list_del(&session->node); |
53569322 | 318 | lttng_destroy_context(session->ctx); |
b5234c06 | 319 | free(session); |
8020ceb5 MD |
320 | } |
321 | ||
d8d2416d FD |
322 | void lttng_event_notifier_group_destroy( |
323 | struct lttng_event_notifier_group *event_notifier_group) | |
324 | { | |
325 | int close_ret; | |
326 | struct lttng_event_notifier_enabler *notifier_enabler, *tmpnotifier_enabler; | |
327 | struct lttng_event_notifier *notifier, *tmpnotifier; | |
328 | ||
329 | if (!event_notifier_group) { | |
330 | return; | |
331 | } | |
332 | ||
333 | cds_list_for_each_entry(notifier, | |
334 | &event_notifier_group->event_notifiers_head, node) | |
335 | _lttng_event_notifier_unregister(notifier); | |
336 | ||
337 | synchronize_trace(); | |
338 | ||
339 | cds_list_for_each_entry_safe(notifier_enabler, tmpnotifier_enabler, | |
340 | &event_notifier_group->enablers_head, node) | |
341 | lttng_event_notifier_enabler_destroy(notifier_enabler); | |
342 | ||
343 | cds_list_for_each_entry_safe(notifier, tmpnotifier, | |
344 | &event_notifier_group->event_notifiers_head, node) | |
345 | _lttng_event_notifier_destroy(notifier); | |
346 | ||
347 | /* Close the notification fd to the listener of event notifiers. */ | |
348 | ||
349 | lttng_ust_lock_fd_tracker(); | |
350 | close_ret = close(event_notifier_group->notification_fd); | |
351 | if (!close_ret) { | |
352 | lttng_ust_delete_fd_from_tracker( | |
353 | event_notifier_group->notification_fd); | |
354 | } else { | |
355 | PERROR("close"); | |
356 | abort(); | |
357 | } | |
358 | lttng_ust_unlock_fd_tracker(); | |
359 | ||
360 | cds_list_del(&event_notifier_group->node); | |
361 | ||
362 | free(event_notifier_group); | |
363 | } | |
364 | ||
d871c65b FD |
365 | static |
366 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
367 | { | |
368 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; | |
369 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; | |
370 | ||
371 | if (!enabler) { | |
372 | return; | |
373 | } | |
374 | ||
375 | /* Destroy filter bytecode */ | |
376 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
377 | &enabler->filter_bytecode_head, node) { | |
378 | free(filter_node); | |
379 | } | |
380 | ||
381 | /* Destroy excluders */ | |
382 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
383 | &enabler->excluder_head, node) { | |
384 | free(excluder_node); | |
385 | } | |
386 | } | |
387 | ||
d8d2416d FD |
388 | void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler) |
389 | { | |
390 | if (!event_notifier_enabler) { | |
391 | return; | |
392 | } | |
393 | ||
394 | cds_list_del(&event_notifier_enabler->node); | |
395 | ||
396 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
397 | ||
398 | free(event_notifier_enabler); | |
399 | } | |
400 | ||
53569322 MD |
401 | static |
402 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
403 | struct lttng_session *session) | |
404 | { | |
405 | const char *enum_name = desc->name; | |
406 | struct lttng_enum *_enum; | |
407 | struct cds_hlist_head *head; | |
53569322 MD |
408 | int ret = 0; |
409 | size_t name_len = strlen(enum_name); | |
410 | uint32_t hash; | |
411 | int notify_socket; | |
412 | ||
b33b46f7 | 413 | /* Check if this enum is already registered for this session. */ |
53569322 MD |
414 | hash = jhash(enum_name, name_len, 0); |
415 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
b33b46f7 FD |
416 | |
417 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
418 | if (_enum) { | |
419 | ret = -EEXIST; | |
420 | goto exist; | |
53569322 MD |
421 | } |
422 | ||
423 | notify_socket = lttng_get_notify_socket(session->owner); | |
424 | if (notify_socket < 0) { | |
425 | ret = notify_socket; | |
426 | goto socket_error; | |
427 | } | |
428 | ||
429 | _enum = zmalloc(sizeof(*_enum)); | |
430 | if (!_enum) { | |
431 | ret = -ENOMEM; | |
432 | goto cache_error; | |
433 | } | |
434 | _enum->session = session; | |
435 | _enum->desc = desc; | |
436 | ||
437 | ret = ustcomm_register_enum(notify_socket, | |
438 | session->objd, | |
439 | enum_name, | |
440 | desc->nr_entries, | |
441 | desc->entries, | |
442 | &_enum->id); | |
443 | if (ret < 0) { | |
444 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
445 | goto sessiond_register_error; | |
446 | } | |
447 | cds_list_add(&_enum->node, &session->enums_head); | |
448 | cds_hlist_add_head(&_enum->hlist, head); | |
449 | return 0; | |
450 | ||
451 | sessiond_register_error: | |
452 | free(_enum); | |
453 | cache_error: | |
454 | socket_error: | |
455 | exist: | |
456 | return ret; | |
457 | } | |
458 | ||
459 | static | |
460 | int lttng_create_enum_check(const struct lttng_type *type, | |
461 | struct lttng_session *session) | |
462 | { | |
463 | switch (type->atype) { | |
464 | case atype_enum: | |
465 | { | |
466 | const struct lttng_enum_desc *enum_desc; | |
467 | int ret; | |
468 | ||
218deb69 MD |
469 | enum_desc = type->u.legacy.basic.enumeration.desc; |
470 | ret = lttng_enum_create(enum_desc, session); | |
471 | if (ret && ret != -EEXIST) { | |
472 | DBG("Unable to create enum error: (%d)", ret); | |
473 | return ret; | |
474 | } | |
475 | break; | |
476 | } | |
477 | case atype_enum_nestable: | |
478 | { | |
479 | const struct lttng_enum_desc *enum_desc; | |
480 | int ret; | |
481 | ||
482 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
483 | ret = lttng_enum_create(enum_desc, session); |
484 | if (ret && ret != -EEXIST) { | |
485 | DBG("Unable to create enum error: (%d)", ret); | |
486 | return ret; | |
487 | } | |
488 | break; | |
489 | } | |
490 | case atype_dynamic: | |
491 | { | |
492 | const struct lttng_event_field *tag_field_generic; | |
493 | const struct lttng_enum_desc *enum_desc; | |
494 | int ret; | |
495 | ||
496 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 497 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
498 | ret = lttng_enum_create(enum_desc, session); |
499 | if (ret && ret != -EEXIST) { | |
500 | DBG("Unable to create enum error: (%d)", ret); | |
501 | return ret; | |
502 | } | |
503 | break; | |
504 | } | |
505 | default: | |
506 | /* TODO: nested types when they become supported. */ | |
507 | break; | |
508 | } | |
509 | return 0; | |
510 | } | |
511 | ||
512 | static | |
513 | int lttng_create_all_event_enums(size_t nr_fields, | |
514 | const struct lttng_event_field *event_fields, | |
515 | struct lttng_session *session) | |
516 | { | |
517 | size_t i; | |
518 | int ret; | |
519 | ||
520 | /* For each field, ensure enum is part of the session. */ | |
521 | for (i = 0; i < nr_fields; i++) { | |
522 | const struct lttng_type *type = &event_fields[i].type; | |
523 | ||
524 | ret = lttng_create_enum_check(type, session); | |
525 | if (ret) | |
526 | return ret; | |
527 | } | |
528 | return 0; | |
529 | } | |
530 | ||
531 | static | |
532 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
533 | const struct lttng_ctx_field *ctx_fields, | |
534 | struct lttng_session *session) | |
535 | { | |
536 | size_t i; | |
537 | int ret; | |
538 | ||
539 | /* For each field, ensure enum is part of the session. */ | |
540 | for (i = 0; i < nr_fields; i++) { | |
541 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
542 | ||
543 | ret = lttng_create_enum_check(type, session); | |
544 | if (ret) | |
545 | return ret; | |
546 | } | |
547 | return 0; | |
548 | } | |
549 | ||
710b8ee3 MD |
550 | /* |
551 | * Ensure that a state-dump will be performed for this session at the end | |
552 | * of the current handle_message(). | |
553 | */ | |
554 | int lttng_session_statedump(struct lttng_session *session) | |
555 | { | |
556 | session->statedump_pending = 1; | |
557 | lttng_ust_sockinfo_session_enabled(session->owner); | |
558 | return 0; | |
559 | } | |
53569322 | 560 | |
7dd08bec | 561 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
562 | { |
563 | int ret = 0; | |
7dd08bec | 564 | struct lttng_channel *chan; |
32ce8569 | 565 | int notify_socket; |
8020ceb5 | 566 | |
8020ceb5 MD |
567 | if (session->active) { |
568 | ret = -EBUSY; | |
569 | goto end; | |
570 | } | |
571 | ||
32ce8569 MD |
572 | notify_socket = lttng_get_notify_socket(session->owner); |
573 | if (notify_socket < 0) | |
574 | return notify_socket; | |
575 | ||
ac6b4ac6 MD |
576 | /* Set transient enabler state to "enabled" */ |
577 | session->tstate = 1; | |
e58095ef | 578 | |
3ff7660f | 579 | /* We need to sync enablers with session before activation. */ |
d871c65b | 580 | lttng_session_sync_event_enablers(session); |
3ff7660f | 581 | |
8020ceb5 MD |
582 | /* |
583 | * Snapshot the number of events per channel to know the type of header | |
584 | * we need to use. | |
585 | */ | |
e58095ef | 586 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 587 | const struct lttng_ctx *ctx; |
83e43212 | 588 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 589 | size_t nr_fields = 0; |
6ca18e66 | 590 | uint32_t chan_id; |
32ce8569 MD |
591 | |
592 | /* don't change it if session stop/restart */ | |
8020ceb5 | 593 | if (chan->header_type) |
32ce8569 MD |
594 | continue; |
595 | ctx = chan->ctx; | |
596 | if (ctx) { | |
597 | nr_fields = ctx->nr_fields; | |
83e43212 | 598 | fields = ctx->fields; |
53569322 MD |
599 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
600 | session); | |
601 | if (ret < 0) { | |
602 | DBG("Error (%d) adding enum to session", ret); | |
603 | return ret; | |
604 | } | |
32ce8569 MD |
605 | } |
606 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 607 | session, |
32ce8569 MD |
608 | session->objd, |
609 | chan->objd, | |
610 | nr_fields, | |
611 | fields, | |
6ca18e66 | 612 | &chan_id, |
32ce8569 | 613 | &chan->header_type); |
b869b5ae MD |
614 | if (ret) { |
615 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 616 | return ret; |
b869b5ae | 617 | } |
6ca18e66 MD |
618 | if (chan_id != chan->id) { |
619 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
620 | chan_id, chan->id); | |
621 | return -EINVAL; | |
622 | } | |
8020ceb5 MD |
623 | } |
624 | ||
ac6b4ac6 | 625 | /* Set atomically the state to "active" */ |
b5234c06 MD |
626 | CMM_ACCESS_ONCE(session->active) = 1; |
627 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 628 | |
710b8ee3 MD |
629 | ret = lttng_session_statedump(session); |
630 | if (ret) | |
631 | return ret; | |
8020ceb5 | 632 | end: |
8020ceb5 MD |
633 | return ret; |
634 | } | |
635 | ||
7dd08bec | 636 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
637 | { |
638 | int ret = 0; | |
639 | ||
8020ceb5 MD |
640 | if (!session->active) { |
641 | ret = -EBUSY; | |
642 | goto end; | |
643 | } | |
ac6b4ac6 | 644 | /* Set atomically the state to "inactive" */ |
b5234c06 | 645 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
646 | |
647 | /* Set transient enabler state to "disabled" */ | |
648 | session->tstate = 0; | |
d871c65b | 649 | lttng_session_sync_event_enablers(session); |
8020ceb5 | 650 | end: |
8020ceb5 MD |
651 | return ret; |
652 | } | |
653 | ||
7dd08bec | 654 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 655 | { |
ac6b4ac6 | 656 | int ret = 0; |
976fe9ea | 657 | |
ac6b4ac6 MD |
658 | if (channel->enabled) { |
659 | ret = -EBUSY; | |
660 | goto end; | |
661 | } | |
662 | /* Set transient enabler state to "enabled" */ | |
663 | channel->tstate = 1; | |
d871c65b | 664 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
665 | /* Set atomically the state to "enabled" */ |
666 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
667 | end: | |
668 | return ret; | |
976fe9ea MD |
669 | } |
670 | ||
7dd08bec | 671 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 672 | { |
ac6b4ac6 | 673 | int ret = 0; |
976fe9ea | 674 | |
ac6b4ac6 MD |
675 | if (!channel->enabled) { |
676 | ret = -EBUSY; | |
677 | goto end; | |
678 | } | |
679 | /* Set atomically the state to "disabled" */ | |
680 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
681 | /* Set transient enabler state to "enabled" */ | |
682 | channel->tstate = 0; | |
d871c65b | 683 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
684 | end: |
685 | return ret; | |
976fe9ea MD |
686 | } |
687 | ||
fb470188 FD |
688 | static inline |
689 | struct cds_hlist_head *borrow_hash_table_bucket( | |
690 | struct cds_hlist_head *hash_table, | |
691 | unsigned int hash_table_size, | |
692 | const struct lttng_event_desc *desc) | |
693 | { | |
694 | const char *event_name; | |
695 | size_t name_len; | |
696 | uint32_t hash; | |
697 | ||
698 | event_name = desc->name; | |
699 | name_len = strlen(event_name); | |
700 | ||
701 | hash = jhash(event_name, name_len, 0); | |
702 | return &hash_table[hash & (hash_table_size - 1)]; | |
703 | } | |
704 | ||
8020ceb5 MD |
705 | /* |
706 | * Supports event creation while tracing session is active. | |
707 | */ | |
e58095ef MD |
708 | static |
709 | int lttng_event_create(const struct lttng_event_desc *desc, | |
710 | struct lttng_channel *chan) | |
8020ceb5 | 711 | { |
7dd08bec | 712 | struct lttng_event *event; |
32ce8569 | 713 | struct lttng_session *session = chan->session; |
d56fa719 | 714 | struct cds_hlist_head *head; |
576599a0 | 715 | int ret = 0; |
32ce8569 MD |
716 | int notify_socket, loglevel; |
717 | const char *uri; | |
8020ceb5 | 718 | |
fb470188 FD |
719 | head = borrow_hash_table_bucket(chan->session->events_ht.table, |
720 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
457a6b58 | 721 | |
32ce8569 MD |
722 | notify_socket = lttng_get_notify_socket(session->owner); |
723 | if (notify_socket < 0) { | |
724 | ret = notify_socket; | |
725 | goto socket_error; | |
726 | } | |
727 | ||
53569322 MD |
728 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
729 | session); | |
c785c634 MD |
730 | if (ret < 0) { |
731 | DBG("Error (%d) adding enum to session", ret); | |
732 | goto create_enum_error; | |
733 | } | |
734 | ||
457a6b58 MD |
735 | /* |
736 | * Check if loglevel match. Refuse to connect event if not. | |
737 | */ | |
7dd08bec | 738 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
739 | if (!event) { |
740 | ret = -ENOMEM; | |
8020ceb5 | 741 | goto cache_error; |
576599a0 | 742 | } |
8020ceb5 | 743 | event->chan = chan; |
e58095ef | 744 | |
ac6b4ac6 MD |
745 | /* Event will be enabled by enabler sync. */ |
746 | event->enabled = 0; | |
747 | event->registered = 0; | |
a56fd376 | 748 | CDS_INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
e58095ef MD |
749 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); |
750 | event->desc = desc; | |
32ce8569 MD |
751 | |
752 | if (desc->loglevel) | |
753 | loglevel = *(*event->desc->loglevel); | |
754 | else | |
755 | loglevel = TRACE_DEFAULT; | |
756 | if (desc->u.ext.model_emf_uri) | |
757 | uri = *(desc->u.ext.model_emf_uri); | |
758 | else | |
759 | uri = NULL; | |
760 | ||
13b21cd6 MD |
761 | /* Fetch event ID from sessiond */ |
762 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 763 | session, |
13b21cd6 MD |
764 | session->objd, |
765 | chan->objd, | |
fb470188 | 766 | desc->name, |
13b21cd6 MD |
767 | loglevel, |
768 | desc->signature, | |
769 | desc->nr_fields, | |
770 | desc->fields, | |
771 | uri, | |
772 | &event->id); | |
773 | if (ret < 0) { | |
774 | DBG("Error (%d) registering event to sessiond", ret); | |
775 | goto sessiond_register_error; | |
32ce8569 | 776 | } |
2b213b16 | 777 | |
e58095ef | 778 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 779 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 780 | return 0; |
8020ceb5 | 781 | |
32ce8569 | 782 | sessiond_register_error: |
b5234c06 | 783 | free(event); |
8020ceb5 | 784 | cache_error: |
c785c634 | 785 | create_enum_error: |
32ce8569 | 786 | socket_error: |
576599a0 | 787 | return ret; |
8020ceb5 MD |
788 | } |
789 | ||
d8d2416d FD |
790 | static |
791 | int lttng_event_notifier_create(const struct lttng_event_desc *desc, | |
792 | uint64_t token, | |
793 | struct lttng_event_notifier_group *event_notifier_group) | |
794 | { | |
795 | struct lttng_event_notifier *event_notifier; | |
796 | struct cds_hlist_head *head; | |
797 | int ret = 0; | |
798 | ||
799 | /* | |
800 | * Get the hashtable bucket the created lttng_event_notifier object | |
801 | * should be inserted. | |
802 | */ | |
803 | head = borrow_hash_table_bucket( | |
804 | event_notifier_group->event_notifiers_ht.table, | |
805 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
806 | ||
807 | event_notifier = zmalloc(sizeof(struct lttng_event_notifier)); | |
808 | if (!event_notifier) { | |
809 | ret = -ENOMEM; | |
810 | goto error; | |
811 | } | |
812 | ||
813 | event_notifier->group = event_notifier_group; | |
814 | event_notifier->user_token = token; | |
815 | ||
816 | /* Event notifier will be enabled by enabler sync. */ | |
817 | event_notifier->enabled = 0; | |
818 | event_notifier->registered = 0; | |
819 | ||
820 | CDS_INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); | |
821 | CDS_INIT_LIST_HEAD(&event_notifier->enablers_ref_head); | |
822 | event_notifier->desc = desc; | |
823 | ||
824 | cds_list_add(&event_notifier->node, | |
825 | &event_notifier_group->event_notifiers_head); | |
826 | cds_hlist_add_head(&event_notifier->hlist, head); | |
827 | ||
828 | return 0; | |
829 | ||
830 | error: | |
831 | return ret; | |
832 | } | |
833 | ||
834 | static | |
835 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
836 | { | |
837 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
838 | ||
839 | /* Remove from event_notifier list. */ | |
840 | cds_list_del(&event_notifier->node); | |
841 | /* Remove from event_notifier hash table. */ | |
842 | cds_hlist_del(&event_notifier->hlist); | |
843 | ||
844 | lttng_free_event_notifier_filter_runtime(event_notifier); | |
845 | ||
846 | /* Free event_notifier enabler refs */ | |
847 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
848 | &event_notifier->enablers_ref_head, node) | |
849 | free(enabler_ref); | |
850 | free(event_notifier); | |
851 | } | |
852 | ||
e58095ef | 853 | static |
196ec2df | 854 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
855 | struct lttng_enabler *enabler) |
856 | { | |
857 | int loglevel = 0; | |
7e2e405c | 858 | unsigned int has_loglevel = 0; |
e58095ef | 859 | |
e450e339 | 860 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f6f42e6 MD |
861 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
862 | desc->name, SIZE_MAX)) | |
e58095ef MD |
863 | return 0; |
864 | if (desc->loglevel) { | |
865 | loglevel = *(*desc->loglevel); | |
866 | has_loglevel = 1; | |
867 | } | |
868 | if (!lttng_loglevel_match(loglevel, | |
869 | has_loglevel, | |
870 | enabler->event_param.loglevel_type, | |
871 | enabler->event_param.loglevel)) | |
872 | return 0; | |
873 | return 1; | |
874 | } | |
875 | ||
876 | static | |
877 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
878 | struct lttng_enabler *enabler) | |
879 | { | |
880 | int loglevel = 0; | |
881 | unsigned int has_loglevel = 0; | |
882 | ||
e450e339 | 883 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
e58095ef MD |
884 | if (strcmp(desc->name, enabler->event_param.name)) |
885 | return 0; | |
886 | if (desc->loglevel) { | |
887 | loglevel = *(*desc->loglevel); | |
888 | has_loglevel = 1; | |
889 | } | |
890 | if (!lttng_loglevel_match(loglevel, | |
891 | has_loglevel, | |
892 | enabler->event_param.loglevel_type, | |
893 | enabler->event_param.loglevel)) | |
894 | return 0; | |
895 | return 1; | |
896 | } | |
897 | ||
898 | static | |
899 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
900 | struct lttng_enabler *enabler) | |
901 | { | |
e450e339 FD |
902 | switch (enabler->format_type) { |
903 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
196ec2df PP |
904 | { |
905 | struct lttng_ust_excluder_node *excluder; | |
906 | ||
907 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
908 | return 0; | |
909 | } | |
910 | ||
911 | /* | |
912 | * If the matching event matches with an excluder, | |
913 | * return 'does not match' | |
914 | */ | |
915 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
916 | int count; | |
917 | ||
918 | for (count = 0; count < excluder->excluder.count; count++) { | |
919 | int len; | |
920 | char *excluder_name; | |
921 | ||
922 | excluder_name = (char *) (excluder->excluder.names) | |
923 | + count * LTTNG_UST_SYM_NAME_LEN; | |
924 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 925 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 926 | return 0; |
ed5b5bbd JI |
927 | } |
928 | } | |
196ec2df | 929 | return 1; |
ed5b5bbd | 930 | } |
e450e339 | 931 | case LTTNG_ENABLER_FORMAT_EVENT: |
e58095ef MD |
932 | return lttng_desc_match_event_enabler(desc, enabler); |
933 | default: | |
934 | return -EINVAL; | |
935 | } | |
936 | } | |
937 | ||
938 | static | |
d871c65b FD |
939 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
940 | struct lttng_event *event) | |
e58095ef | 941 | { |
d871c65b FD |
942 | if (lttng_desc_match_enabler(event->desc, |
943 | lttng_event_enabler_as_enabler(event_enabler)) | |
944 | && event->chan == event_enabler->chan) | |
d970f72e MD |
945 | return 1; |
946 | else | |
947 | return 0; | |
e58095ef MD |
948 | } |
949 | ||
d8d2416d FD |
950 | static |
951 | int lttng_event_notifier_enabler_match_event_notifier( | |
952 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
953 | struct lttng_event_notifier *event_notifier) | |
954 | { | |
955 | int desc_matches = lttng_desc_match_enabler(event_notifier->desc, | |
956 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
957 | ||
958 | if (desc_matches && event_notifier->group == event_notifier_enabler->group && | |
959 | event_notifier->user_token == event_notifier_enabler->user_token) | |
960 | return 1; | |
961 | else | |
962 | return 0; | |
963 | } | |
964 | ||
e58095ef | 965 | static |
d871c65b FD |
966 | struct lttng_enabler_ref *lttng_enabler_ref( |
967 | struct cds_list_head *enabler_ref_list, | |
e58095ef MD |
968 | struct lttng_enabler *enabler) |
969 | { | |
970 | struct lttng_enabler_ref *enabler_ref; | |
971 | ||
d871c65b | 972 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
e58095ef MD |
973 | if (enabler_ref->ref == enabler) |
974 | return enabler_ref; | |
975 | } | |
976 | return NULL; | |
977 | } | |
978 | ||
8020ceb5 | 979 | /* |
e58095ef MD |
980 | * Create struct lttng_event if it is missing and present in the list of |
981 | * tracepoint probes. | |
8020ceb5 | 982 | */ |
e58095ef | 983 | static |
d871c65b | 984 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 985 | { |
d871c65b | 986 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
987 | struct lttng_probe_desc *probe_desc; |
988 | const struct lttng_event_desc *desc; | |
989 | struct lttng_event *event; | |
990 | int i; | |
991 | struct cds_list_head *probe_list; | |
992 | ||
993 | probe_list = lttng_get_probe_list_head(); | |
994 | /* | |
995 | * For each probe event, if we find that a probe event matches | |
996 | * our enabler, create an associated lttng_event if not | |
997 | * already present. | |
998 | */ | |
999 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1000 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
1001 | int ret; |
1002 | bool found = false; | |
d56fa719 MD |
1003 | struct cds_hlist_head *head; |
1004 | struct cds_hlist_node *node; | |
e58095ef MD |
1005 | |
1006 | desc = probe_desc->event_desc[i]; | |
d871c65b FD |
1007 | if (!lttng_desc_match_enabler(desc, |
1008 | lttng_event_enabler_as_enabler(event_enabler))) | |
e58095ef MD |
1009 | continue; |
1010 | ||
fb470188 FD |
1011 | head = borrow_hash_table_bucket( |
1012 | session->events_ht.table, | |
1013 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
1014 | ||
d56fa719 | 1015 | cds_hlist_for_each_entry(event, node, head, hlist) { |
d970f72e | 1016 | if (event->desc == desc |
d871c65b | 1017 | && event->chan == event_enabler->chan) { |
98a97f24 | 1018 | found = true; |
3140bffe FD |
1019 | break; |
1020 | } | |
e58095ef MD |
1021 | } |
1022 | if (found) | |
1023 | continue; | |
1024 | ||
1025 | /* | |
1026 | * We need to create an event for this | |
1027 | * event probe. | |
1028 | */ | |
1029 | ret = lttng_event_create(probe_desc->event_desc[i], | |
d871c65b | 1030 | event_enabler->chan); |
e58095ef | 1031 | if (ret) { |
32ce8569 MD |
1032 | DBG("Unable to create event %s, error %d\n", |
1033 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 1034 | } |
8165c8da | 1035 | } |
8020ceb5 | 1036 | } |
8020ceb5 MD |
1037 | } |
1038 | ||
a44d07da FD |
1039 | static |
1040 | void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc, | |
d8d2416d FD |
1041 | void (*event_func)(struct lttng_session *session, |
1042 | struct lttng_event *event), | |
1043 | void (*event_notifier_func)(struct lttng_event_notifier *event_notifier)) | |
35ac38cb FD |
1044 | { |
1045 | struct cds_hlist_node *node, *tmp_node; | |
1046 | struct cds_list_head *sessionsp; | |
a44d07da | 1047 | unsigned int i; |
35ac38cb FD |
1048 | |
1049 | /* Get handle on list of sessions. */ | |
1050 | sessionsp = _lttng_get_sessions(); | |
1051 | ||
1052 | /* | |
a44d07da FD |
1053 | * Iterate over all events in the probe provider descriptions and |
1054 | * sessions to queue the unregistration of the events. | |
35ac38cb FD |
1055 | */ |
1056 | for (i = 0; i < provider_desc->nr_events; i++) { | |
1057 | const struct lttng_event_desc *event_desc; | |
d8d2416d FD |
1058 | struct lttng_event_notifier_group *event_notifier_group; |
1059 | struct lttng_event_notifier *event_notifier; | |
a44d07da FD |
1060 | struct lttng_session *session; |
1061 | struct cds_hlist_head *head; | |
1062 | struct lttng_event *event; | |
35ac38cb FD |
1063 | |
1064 | event_desc = provider_desc->event_desc[i]; | |
35ac38cb | 1065 | |
a44d07da FD |
1066 | /* |
1067 | * Iterate over all session to find the current event | |
1068 | * description. | |
1069 | */ | |
35ac38cb FD |
1070 | cds_list_for_each_entry(session, sessionsp, node) { |
1071 | /* | |
a44d07da FD |
1072 | * Get the list of events in the hashtable bucket and |
1073 | * iterate to find the event matching this descriptor. | |
35ac38cb | 1074 | */ |
fb470188 FD |
1075 | head = borrow_hash_table_bucket( |
1076 | session->events_ht.table, | |
1077 | LTTNG_UST_EVENT_HT_SIZE, event_desc); | |
1078 | ||
a44d07da | 1079 | cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) { |
35ac38cb | 1080 | if (event_desc == event->desc) { |
a44d07da | 1081 | event_func(session, event); |
35ac38cb FD |
1082 | break; |
1083 | } | |
1084 | } | |
1085 | } | |
d8d2416d FD |
1086 | |
1087 | /* | |
1088 | * Iterate over all event_notifier groups to find the current event | |
1089 | * description. | |
1090 | */ | |
1091 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1092 | /* | |
1093 | * Get the list of event_notifiers in the hashtable bucket and | |
1094 | * iterate to find the event_notifier matching this | |
1095 | * descriptor. | |
1096 | */ | |
1097 | head = borrow_hash_table_bucket( | |
1098 | event_notifier_group->event_notifiers_ht.table, | |
1099 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, event_desc); | |
1100 | ||
1101 | cds_hlist_for_each_entry_safe(event_notifier, node, tmp_node, head, hlist) { | |
1102 | if (event_desc == event_notifier->desc) { | |
1103 | event_notifier_func(event_notifier); | |
1104 | break; | |
1105 | } | |
1106 | } | |
1107 | } | |
35ac38cb | 1108 | } |
a44d07da FD |
1109 | } |
1110 | ||
1111 | static | |
1112 | void _unregister_event(struct lttng_session *session, | |
1113 | struct lttng_event *event) | |
1114 | { | |
1115 | _lttng_event_unregister(event); | |
1116 | } | |
1117 | ||
1118 | static | |
1119 | void _event_enum_destroy(struct lttng_session *session, | |
1120 | struct lttng_event *event) | |
1121 | { | |
1122 | unsigned int i; | |
1123 | ||
1124 | /* Destroy enums of the current event. */ | |
1125 | for (i = 0; i < event->desc->nr_fields; i++) { | |
1126 | const struct lttng_enum_desc *enum_desc; | |
1127 | const struct lttng_event_field *field; | |
1128 | struct lttng_enum *curr_enum; | |
1129 | ||
1130 | field = &(event->desc->fields[i]); | |
1131 | switch (field->type.atype) { | |
1132 | case atype_enum: | |
1133 | enum_desc = field->type.u.legacy.basic.enumeration.desc; | |
1134 | break; | |
1135 | case atype_enum_nestable: | |
1136 | enum_desc = field->type.u.enum_nestable.desc; | |
1137 | break; | |
1138 | default: | |
1139 | continue; | |
1140 | } | |
1141 | ||
1142 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); | |
1143 | if (curr_enum) { | |
1144 | _lttng_enum_destroy(curr_enum); | |
1145 | } | |
1146 | } | |
1147 | ||
1148 | /* Destroy event. */ | |
1149 | _lttng_event_destroy(event); | |
1150 | } | |
1151 | ||
1152 | /* | |
1153 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
1154 | * the probe provider descriptor received as argument. Must me called with the | |
1155 | * ust_lock held. | |
1156 | */ | |
1157 | void lttng_probe_provider_unregister_events( | |
1158 | struct lttng_probe_desc *provider_desc) | |
1159 | { | |
1160 | /* | |
1161 | * Iterate over all events in the probe provider descriptions and sessions | |
1162 | * to queue the unregistration of the events. | |
1163 | */ | |
d8d2416d FD |
1164 | probe_provider_event_for_each(provider_desc, _unregister_event, |
1165 | _lttng_event_notifier_unregister); | |
35ac38cb FD |
1166 | |
1167 | /* Wait for grace period. */ | |
1168 | synchronize_trace(); | |
1169 | /* Prune the unregistration queue. */ | |
1170 | __tracepoint_probe_prune_release_queue(); | |
1171 | ||
1172 | /* | |
1173 | * It is now safe to destroy the events and remove them from the event list | |
1174 | * and hashtables. | |
1175 | */ | |
d8d2416d FD |
1176 | probe_provider_event_for_each(provider_desc, _event_enum_destroy, |
1177 | _lttng_event_notifier_destroy); | |
35ac38cb FD |
1178 | } |
1179 | ||
8020ceb5 | 1180 | /* |
d8d2416d | 1181 | * Create events associated with an event enabler (if not already present), |
e58095ef | 1182 | * and add backward reference from the event to the enabler. |
8020ceb5 MD |
1183 | */ |
1184 | static | |
d871c65b | 1185 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1186 | { |
d871c65b | 1187 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1188 | struct lttng_event *event; |
1189 | ||
d871c65b | 1190 | if (!lttng_event_enabler_as_enabler(event_enabler)->enabled) |
de713d8a FD |
1191 | goto end; |
1192 | ||
e58095ef | 1193 | /* First ensure that probe events are created for this enabler. */ |
d871c65b | 1194 | lttng_create_event_if_missing(event_enabler); |
e58095ef MD |
1195 | |
1196 | /* For each event matching enabler in session event list. */ | |
1197 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1198 | struct lttng_enabler_ref *enabler_ref; | |
1199 | ||
d871c65b | 1200 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
e58095ef MD |
1201 | continue; |
1202 | ||
d871c65b FD |
1203 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
1204 | lttng_event_enabler_as_enabler(event_enabler)); | |
e58095ef MD |
1205 | if (!enabler_ref) { |
1206 | /* | |
1207 | * If no backward ref, create it. | |
1208 | * Add backward ref from event to enabler. | |
1209 | */ | |
1210 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1211 | if (!enabler_ref) | |
1212 | return -ENOMEM; | |
d871c65b FD |
1213 | enabler_ref->ref = lttng_event_enabler_as_enabler( |
1214 | event_enabler); | |
e58095ef MD |
1215 | cds_list_add(&enabler_ref->node, |
1216 | &event->enablers_ref_head); | |
8165c8da | 1217 | } |
e58095ef MD |
1218 | |
1219 | /* | |
1220 | * Link filter bytecodes if not linked yet. | |
1221 | */ | |
53b9d7db FD |
1222 | lttng_enabler_link_bytecode(event->desc, |
1223 | &session->ctx, | |
a56fd376 | 1224 | &event->filter_bytecode_runtime_head, |
53b9d7db | 1225 | lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef MD |
1226 | |
1227 | /* TODO: merge event context. */ | |
1228 | } | |
de713d8a | 1229 | end: |
e58095ef MD |
1230 | return 0; |
1231 | } | |
1232 | ||
1233 | /* | |
1234 | * Called at library load: connect the probe on all enablers matching | |
1235 | * this event. | |
5f733922 | 1236 | * Called with session mutex held. |
e58095ef | 1237 | */ |
5f733922 | 1238 | int lttng_fix_pending_events(void) |
e58095ef MD |
1239 | { |
1240 | struct lttng_session *session; | |
1241 | ||
1242 | cds_list_for_each_entry(session, &sessions, node) { | |
d871c65b | 1243 | lttng_session_lazy_sync_event_enablers(session); |
8020ceb5 | 1244 | } |
e58095ef MD |
1245 | return 0; |
1246 | } | |
1247 | ||
d8d2416d FD |
1248 | int lttng_fix_pending_event_notifiers(void) |
1249 | { | |
1250 | struct lttng_event_notifier_group *event_notifier_group; | |
1251 | ||
1252 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1253 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1254 | } | |
1255 | return 0; | |
1256 | } | |
1257 | ||
246be17e | 1258 | /* |
37dddb65 MD |
1259 | * For each session of the owner thread, execute pending statedump. |
1260 | * Only dump state for the sessions owned by the caller thread, because | |
1261 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 1262 | */ |
3327ac33 | 1263 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
1264 | { |
1265 | struct lttng_session *session; | |
1266 | ||
37dddb65 | 1267 | /* Execute state dump */ |
cf73e0fe | 1268 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
1269 | |
1270 | /* Clear pending state dump */ | |
3327ac33 MD |
1271 | if (ust_lock()) { |
1272 | goto end; | |
1273 | } | |
246be17e | 1274 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
1275 | if (session->owner != owner) |
1276 | continue; | |
1277 | if (!session->statedump_pending) | |
1278 | continue; | |
1279 | session->statedump_pending = 0; | |
246be17e | 1280 | } |
3327ac33 | 1281 | end: |
37dddb65 | 1282 | ust_unlock(); |
3327ac33 | 1283 | return; |
246be17e PW |
1284 | } |
1285 | ||
e58095ef MD |
1286 | /* |
1287 | * Only used internally at session destruction. | |
1288 | */ | |
1289 | static | |
1290 | void _lttng_event_destroy(struct lttng_event *event) | |
1291 | { | |
1292 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1293 | ||
35ac38cb | 1294 | /* Remove from event list. */ |
e58095ef | 1295 | cds_list_del(&event->node); |
35ac38cb FD |
1296 | /* Remove from event hash table. */ |
1297 | cds_hlist_del(&event->hlist); | |
1298 | ||
8020ceb5 | 1299 | lttng_destroy_context(event->ctx); |
f488575f | 1300 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1301 | /* Free event enabler refs */ |
1302 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1303 | &event->enablers_ref_head, node) | |
1304 | free(enabler_ref); | |
b5234c06 | 1305 | free(event); |
8020ceb5 MD |
1306 | } |
1307 | ||
c785c634 MD |
1308 | static |
1309 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1310 | { | |
1311 | cds_list_del(&_enum->node); | |
35ac38cb | 1312 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1313 | free(_enum); |
1314 | } | |
1315 | ||
003fedf4 | 1316 | void lttng_ust_events_exit(void) |
8020ceb5 | 1317 | { |
7dd08bec | 1318 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1319 | |
e58095ef | 1320 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1321 | lttng_session_destroy(session); |
8020ceb5 | 1322 | } |
457a6b58 | 1323 | |
e58095ef MD |
1324 | /* |
1325 | * Enabler management. | |
1326 | */ | |
d871c65b FD |
1327 | struct lttng_event_enabler *lttng_event_enabler_create( |
1328 | enum lttng_enabler_format_type format_type, | |
e58095ef MD |
1329 | struct lttng_ust_event *event_param, |
1330 | struct lttng_channel *chan) | |
457a6b58 | 1331 | { |
d871c65b | 1332 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1333 | |
d871c65b FD |
1334 | event_enabler = zmalloc(sizeof(*event_enabler)); |
1335 | if (!event_enabler) | |
e58095ef | 1336 | return NULL; |
d871c65b FD |
1337 | event_enabler->base.format_type = format_type; |
1338 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1339 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); | |
1340 | memcpy(&event_enabler->base.event_param, event_param, | |
1341 | sizeof(event_enabler->base.event_param)); | |
1342 | event_enabler->chan = chan; | |
e58095ef | 1343 | /* ctx left NULL */ |
d871c65b FD |
1344 | event_enabler->base.enabled = 0; |
1345 | cds_list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); | |
1346 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1347 | ||
1348 | return event_enabler; | |
457a6b58 MD |
1349 | } |
1350 | ||
d8d2416d FD |
1351 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
1352 | struct lttng_event_notifier_group *event_notifier_group, | |
1353 | enum lttng_enabler_format_type format_type, | |
1354 | struct lttng_ust_event_notifier *event_notifier_param) | |
1355 | { | |
1356 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1357 | ||
1358 | event_notifier_enabler = zmalloc(sizeof(*event_notifier_enabler)); | |
1359 | if (!event_notifier_enabler) | |
1360 | return NULL; | |
1361 | event_notifier_enabler->base.format_type = format_type; | |
1362 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
1363 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.excluder_head); | |
1364 | ||
1365 | event_notifier_enabler->user_token = event_notifier_param->event.token; | |
1366 | ||
1367 | memcpy(&event_notifier_enabler->base.event_param.name, | |
1368 | event_notifier_param->event.name, | |
1369 | sizeof(event_notifier_enabler->base.event_param.name)); | |
1370 | event_notifier_enabler->base.event_param.instrumentation = | |
1371 | event_notifier_param->event.instrumentation; | |
1372 | event_notifier_enabler->base.event_param.loglevel = | |
1373 | event_notifier_param->event.loglevel; | |
1374 | event_notifier_enabler->base.event_param.loglevel_type = | |
1375 | event_notifier_param->event.loglevel_type; | |
1376 | ||
1377 | event_notifier_enabler->base.enabled = 0; | |
1378 | event_notifier_enabler->group = event_notifier_group; | |
1379 | ||
1380 | cds_list_add(&event_notifier_enabler->node, | |
1381 | &event_notifier_group->enablers_head); | |
1382 | ||
1383 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1384 | ||
1385 | return event_notifier_enabler; | |
1386 | } | |
1387 | ||
d871c65b | 1388 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1389 | { |
d871c65b FD |
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 | |
d871c65b | 1396 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1397 | { |
d871c65b 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 | |
d871c65b | 1404 | static |
a56fd376 | 1405 | void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
e58095ef MD |
1406 | struct lttng_ust_filter_bytecode_node *bytecode) |
1407 | { | |
1408 | bytecode->enabler = enabler; | |
1409 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
d871c65b FD |
1410 | } |
1411 | ||
a56fd376 | 1412 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
d871c65b FD |
1413 | struct lttng_ust_filter_bytecode_node *bytecode) |
1414 | { | |
a56fd376 | 1415 | _lttng_enabler_attach_filter_bytecode( |
d871c65b FD |
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 | ||
d871c65b 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); | |
d871c65b 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); | |
0bfb5cbd | 1437 | return 0; |
e58095ef | 1438 | } |
f488575f | 1439 | |
d8d2416d FD |
1440 | int lttng_event_notifier_enabler_enable( |
1441 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1442 | { | |
1443 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
1444 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1445 | ||
1446 | return 0; | |
1447 | } | |
1448 | ||
1449 | int lttng_event_notifier_enabler_disable( | |
1450 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1451 | { | |
1452 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
1453 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1454 | ||
1455 | return 0; | |
1456 | } | |
1457 | ||
a56fd376 | 1458 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
d8d2416d FD |
1459 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
1460 | struct lttng_ust_filter_bytecode_node *bytecode) | |
1461 | { | |
a56fd376 | 1462 | _lttng_enabler_attach_filter_bytecode( |
d8d2416d FD |
1463 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
1464 | bytecode); | |
1465 | ||
1466 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1467 | return 0; | |
1468 | } | |
1469 | ||
1470 | int lttng_event_notifier_enabler_attach_exclusion( | |
1471 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1472 | struct lttng_ust_excluder_node *excluder) | |
1473 | { | |
1474 | _lttng_enabler_attach_exclusion( | |
1475 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), | |
1476 | excluder); | |
1477 | ||
1478 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1479 | return 0; | |
1480 | } | |
1481 | ||
e58095ef | 1482 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1483 | union ust_args *uargs, |
e58095ef MD |
1484 | struct lttng_ctx **ctx, struct lttng_session *session) |
1485 | { | |
457a6b58 | 1486 | /* |
e58095ef MD |
1487 | * We cannot attach a context after trace has been started for a |
1488 | * session because the metadata does not allow expressing this | |
1489 | * information outside of the original channel scope. | |
457a6b58 | 1490 | */ |
e58095ef MD |
1491 | if (session->been_active) |
1492 | return -EPERM; | |
457a6b58 | 1493 | |
e58095ef MD |
1494 | switch (context_param->ctx) { |
1495 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1496 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1497 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1498 | { | |
1499 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1500 | ||
1501 | perf_ctx_param = &context_param->u.perf_counter; | |
1502 | return lttng_add_perf_counter_to_ctx( | |
1503 | perf_ctx_param->type, | |
1504 | perf_ctx_param->config, | |
1505 | perf_ctx_param->name, | |
1506 | ctx); | |
1507 | } | |
e58095ef MD |
1508 | case LTTNG_UST_CONTEXT_VTID: |
1509 | return lttng_add_vtid_to_ctx(ctx); | |
1510 | case LTTNG_UST_CONTEXT_VPID: | |
1511 | return lttng_add_vpid_to_ctx(ctx); | |
1512 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1513 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1514 | case LTTNG_UST_CONTEXT_IP: |
1515 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1516 | case LTTNG_UST_CONTEXT_CPU_ID: |
1517 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1518 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1519 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1520 | ctx); | |
735bef47 MJ |
1521 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1522 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1523 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1524 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1525 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1526 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1527 | case LTTNG_UST_CONTEXT_NET_NS: | |
1528 | return lttng_add_net_ns_to_ctx(ctx); | |
1529 | case LTTNG_UST_CONTEXT_PID_NS: | |
1530 | return lttng_add_pid_ns_to_ctx(ctx); | |
cefef7a7 MJ |
1531 | case LTTNG_UST_CONTEXT_TIME_NS: |
1532 | return lttng_add_time_ns_to_ctx(ctx); | |
735bef47 MJ |
1533 | case LTTNG_UST_CONTEXT_USER_NS: |
1534 | return lttng_add_user_ns_to_ctx(ctx); | |
1535 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1536 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1537 | case LTTNG_UST_CONTEXT_VUID: |
1538 | return lttng_add_vuid_to_ctx(ctx); | |
1539 | case LTTNG_UST_CONTEXT_VEUID: | |
1540 | return lttng_add_veuid_to_ctx(ctx); | |
1541 | case LTTNG_UST_CONTEXT_VSUID: | |
1542 | return lttng_add_vsuid_to_ctx(ctx); | |
1543 | case LTTNG_UST_CONTEXT_VGID: | |
1544 | return lttng_add_vgid_to_ctx(ctx); | |
1545 | case LTTNG_UST_CONTEXT_VEGID: | |
1546 | return lttng_add_vegid_to_ctx(ctx); | |
1547 | case LTTNG_UST_CONTEXT_VSGID: | |
1548 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1549 | default: |
1550 | return -EINVAL; | |
457a6b58 | 1551 | } |
457a6b58 MD |
1552 | } |
1553 | ||
d871c65b | 1554 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
e58095ef | 1555 | struct lttng_ust_context *context_param) |
457a6b58 | 1556 | { |
e58095ef | 1557 | return -ENOSYS; |
457a6b58 MD |
1558 | } |
1559 | ||
d871c65b | 1560 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1561 | { |
d871c65b FD |
1562 | if (!event_enabler) { |
1563 | return; | |
0f63324a | 1564 | } |
d871c65b | 1565 | cds_list_del(&event_enabler->node); |
0f63324a | 1566 | |
d871c65b | 1567 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef | 1568 | |
d871c65b FD |
1569 | lttng_destroy_context(event_enabler->ctx); |
1570 | free(event_enabler); | |
457a6b58 MD |
1571 | } |
1572 | ||
e58095ef | 1573 | /* |
d871c65b | 1574 | * lttng_session_sync_event_enablers should be called just before starting a |
e58095ef MD |
1575 | * session. |
1576 | */ | |
457a6b58 | 1577 | static |
d871c65b | 1578 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1579 | { |
d871c65b | 1580 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1581 | struct lttng_event *event; |
457a6b58 | 1582 | |
d871c65b FD |
1583 | cds_list_for_each_entry(event_enabler, &session->enablers_head, node) |
1584 | lttng_event_enabler_ref_events(event_enabler); | |
e58095ef MD |
1585 | /* |
1586 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1587 | * and its channel and session transient states are enabled, we |
1588 | * enable the event, else we disable it. | |
e58095ef MD |
1589 | */ |
1590 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1591 | struct lttng_enabler_ref *enabler_ref; | |
1592 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1593 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1594 | |
1595 | /* Enable events */ | |
1596 | cds_list_for_each_entry(enabler_ref, | |
1597 | &event->enablers_ref_head, node) { | |
1598 | if (enabler_ref->ref->enabled) { | |
1599 | enabled = 1; | |
1600 | break; | |
1601 | } | |
1602 | } | |
ac6b4ac6 MD |
1603 | /* |
1604 | * Enabled state is based on union of enablers, with | |
1605 | * intesection of session and channel transient enable | |
1606 | * states. | |
1607 | */ | |
1608 | enabled = enabled && session->tstate && event->chan->tstate; | |
1609 | ||
1610 | CMM_STORE_SHARED(event->enabled, enabled); | |
1611 | /* | |
1612 | * Sync tracepoint registration with event enabled | |
1613 | * state. | |
1614 | */ | |
1615 | if (enabled) { | |
1616 | if (!event->registered) | |
1617 | register_event(event); | |
1618 | } else { | |
1619 | if (event->registered) | |
1620 | unregister_event(event); | |
1621 | } | |
457a6b58 | 1622 | |
1f49fc05 | 1623 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1624 | cds_list_for_each_entry(enabler_ref, |
1625 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1626 | if (enabler_ref->ref->enabled |
1627 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1628 | has_enablers_without_bytecode = 1; |
1629 | break; | |
1630 | } | |
1631 | } | |
1632 | event->has_enablers_without_bytecode = | |
1633 | has_enablers_without_bytecode; | |
1634 | ||
e58095ef MD |
1635 | /* Enable filters */ |
1636 | cds_list_for_each_entry(runtime, | |
a56fd376 | 1637 | &event->filter_bytecode_runtime_head, node) { |
e58095ef | 1638 | lttng_filter_sync_state(runtime); |
457a6b58 MD |
1639 | } |
1640 | } | |
baa1e0bc | 1641 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1642 | } |
1643 | ||
d8d2416d FD |
1644 | static |
1645 | void lttng_create_event_notifier_if_missing( | |
1646 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1647 | { | |
1648 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1649 | struct lttng_probe_desc *probe_desc; | |
1650 | struct cds_list_head *probe_list; | |
1651 | int i; | |
1652 | ||
1653 | probe_list = lttng_get_probe_list_head(); | |
1654 | ||
1655 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1656 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1657 | int ret; | |
1658 | bool found = false; | |
1659 | const struct lttng_event_desc *desc; | |
1660 | struct lttng_event_notifier *event_notifier; | |
1661 | struct cds_hlist_head *head; | |
1662 | struct cds_hlist_node *node; | |
1663 | ||
1664 | desc = probe_desc->event_desc[i]; | |
1665 | if (!lttng_desc_match_enabler(desc, | |
1666 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1667 | continue; | |
1668 | ||
1669 | /* | |
1670 | * Given the current event_notifier group, get the bucket that | |
1671 | * the target event_notifier would be if it was already | |
1672 | * created. | |
1673 | */ | |
1674 | head = borrow_hash_table_bucket( | |
1675 | event_notifier_group->event_notifiers_ht.table, | |
1676 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
1677 | ||
1678 | cds_hlist_for_each_entry(event_notifier, node, head, hlist) { | |
1679 | /* | |
1680 | * Check if event_notifier already exists by checking | |
1681 | * if the event_notifier and enabler share the same | |
1682 | * description and id. | |
1683 | */ | |
1684 | if (event_notifier->desc == desc && | |
1685 | event_notifier->user_token == event_notifier_enabler->user_token) { | |
1686 | found = true; | |
1687 | break; | |
1688 | } | |
1689 | } | |
1690 | ||
1691 | if (found) | |
1692 | continue; | |
1693 | ||
1694 | /* | |
1695 | * We need to create a event_notifier for this event probe. | |
1696 | */ | |
1697 | ret = lttng_event_notifier_create(desc, | |
1698 | event_notifier_enabler->user_token, | |
1699 | event_notifier_group); | |
1700 | if (ret) { | |
1701 | DBG("Unable to create event_notifier %s, error %d\n", | |
1702 | probe_desc->event_desc[i]->name, ret); | |
1703 | } | |
1704 | } | |
1705 | } | |
1706 | } | |
1707 | ||
1708 | /* | |
1709 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
1710 | */ | |
1711 | static | |
1712 | int lttng_event_notifier_enabler_ref_event_notifiers( | |
1713 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1714 | { | |
1715 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1716 | struct lttng_event_notifier *event_notifier; | |
1717 | ||
1718 | /* | |
1719 | * Only try to create event_notifiers for enablers that are enabled, the user | |
1720 | * might still be attaching filter or exclusion to the | |
1721 | * event_notifier_enabler. | |
1722 | */ | |
1723 | if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled) | |
1724 | goto end; | |
1725 | ||
1726 | /* First, ensure that probe event_notifiers are created for this enabler. */ | |
1727 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
1728 | ||
1729 | /* Link the created event_notifier with its associated enabler. */ | |
1730 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1731 | struct lttng_enabler_ref *enabler_ref; | |
1732 | ||
1733 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
1734 | continue; | |
1735 | ||
1736 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
1737 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1738 | if (!enabler_ref) { | |
1739 | /* | |
1740 | * If no backward ref, create it. | |
1741 | * Add backward ref from event_notifier to enabler. | |
1742 | */ | |
1743 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1744 | if (!enabler_ref) | |
1745 | return -ENOMEM; | |
1746 | ||
1747 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
1748 | event_notifier_enabler); | |
1749 | cds_list_add(&enabler_ref->node, | |
1750 | &event_notifier->enablers_ref_head); | |
1751 | } | |
1752 | ||
1753 | /* | |
1754 | * Link filter bytecodes if not linked yet. | |
1755 | */ | |
1756 | lttng_enabler_link_bytecode(event_notifier->desc, | |
1757 | &event_notifier_group->ctx, &event_notifier->filter_bytecode_runtime_head, | |
1758 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1759 | } | |
1760 | end: | |
1761 | return 0; | |
1762 | } | |
1763 | ||
1764 | static | |
1765 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
1766 | { | |
1767 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1768 | struct lttng_event_notifier *event_notifier; | |
1769 | ||
1770 | cds_list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
1771 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
1772 | ||
1773 | /* | |
1774 | * For each event_notifier, if at least one of its enablers is enabled, | |
1775 | * we enable the event_notifier, else we disable it. | |
1776 | */ | |
1777 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1778 | struct lttng_enabler_ref *enabler_ref; | |
1779 | struct lttng_bytecode_runtime *runtime; | |
1780 | int enabled = 0, has_enablers_without_bytecode = 0; | |
1781 | ||
1782 | /* Enable event_notifiers */ | |
1783 | cds_list_for_each_entry(enabler_ref, | |
1784 | &event_notifier->enablers_ref_head, node) { | |
1785 | if (enabler_ref->ref->enabled) { | |
1786 | enabled = 1; | |
1787 | break; | |
1788 | } | |
1789 | } | |
1790 | ||
1791 | CMM_STORE_SHARED(event_notifier->enabled, enabled); | |
1792 | /* | |
1793 | * Sync tracepoint registration with event_notifier enabled | |
1794 | * state. | |
1795 | */ | |
1796 | if (enabled) { | |
1797 | if (!event_notifier->registered) | |
1798 | register_event_notifier(event_notifier); | |
1799 | } else { | |
1800 | if (event_notifier->registered) | |
1801 | unregister_event_notifier(event_notifier); | |
1802 | } | |
1803 | ||
1804 | /* Check if has enablers without bytecode enabled */ | |
1805 | cds_list_for_each_entry(enabler_ref, | |
1806 | &event_notifier->enablers_ref_head, node) { | |
1807 | if (enabler_ref->ref->enabled | |
1808 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1809 | has_enablers_without_bytecode = 1; | |
1810 | break; | |
1811 | } | |
1812 | } | |
1813 | event_notifier->has_enablers_without_bytecode = | |
1814 | has_enablers_without_bytecode; | |
1815 | ||
1816 | /* Enable filters */ | |
1817 | cds_list_for_each_entry(runtime, | |
1818 | &event_notifier->filter_bytecode_runtime_head, node) { | |
1819 | lttng_filter_sync_state(runtime); | |
1820 | } | |
1821 | } | |
1822 | __tracepoint_probe_prune_release_queue(); | |
1823 | } | |
1824 | ||
e58095ef MD |
1825 | /* |
1826 | * Apply enablers to session events, adding events to session if need | |
1827 | * be. It is required after each modification applied to an active | |
1828 | * session, and right before session "start". | |
1829 | * "lazy" sync means we only sync if required. | |
1830 | */ | |
1831 | static | |
d871c65b | 1832 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1833 | { |
e58095ef MD |
1834 | /* We can skip if session is not active */ |
1835 | if (!session->active) | |
1836 | return; | |
d871c65b | 1837 | lttng_session_sync_event_enablers(session); |
457a6b58 | 1838 | } |
53569322 MD |
1839 | |
1840 | /* | |
1841 | * Update all sessions with the given app context. | |
1842 | * Called with ust lock held. | |
1843 | * This is invoked when an application context gets loaded/unloaded. It | |
1844 | * ensures the context callbacks are in sync with the application | |
1845 | * context (either app context callbacks, or dummy callbacks). | |
1846 | */ | |
1847 | void lttng_ust_context_set_session_provider(const char *name, | |
1848 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1849 | void (*record)(struct lttng_ctx_field *field, | |
1850 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1851 | struct lttng_channel *chan), | |
1852 | void (*get_value)(struct lttng_ctx_field *field, | |
1853 | struct lttng_ctx_value *value)) | |
1854 | { | |
1855 | struct lttng_session *session; | |
1856 | ||
1857 | cds_list_for_each_entry(session, &sessions, node) { | |
1858 | struct lttng_channel *chan; | |
1859 | struct lttng_event *event; | |
1860 | int ret; | |
1861 | ||
1862 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1863 | name, get_size, record, get_value); | |
1864 | if (ret) | |
1865 | abort(); | |
1866 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1867 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1868 | name, get_size, record, get_value); | |
1869 | if (ret) | |
1870 | abort(); | |
1871 | } | |
1872 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1873 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1874 | name, get_size, record, get_value); | |
1875 | if (ret) | |
1876 | abort(); | |
1877 | } | |
1878 | } | |
1879 | } | |
d8d2416d FD |
1880 | |
1881 | /* | |
1882 | * Update all event_notifier groups with the given app context. | |
1883 | * Called with ust lock held. | |
1884 | * This is invoked when an application context gets loaded/unloaded. It | |
1885 | * ensures the context callbacks are in sync with the application | |
1886 | * context (either app context callbacks, or dummy callbacks). | |
1887 | */ | |
1888 | void lttng_ust_context_set_event_notifier_group_provider(const char *name, | |
1889 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1890 | void (*record)(struct lttng_ctx_field *field, | |
1891 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1892 | struct lttng_channel *chan), | |
1893 | void (*get_value)(struct lttng_ctx_field *field, | |
1894 | struct lttng_ctx_value *value)) | |
1895 | { | |
1896 | struct lttng_event_notifier_group *event_notifier_group; | |
1897 | ||
1898 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1899 | int ret; | |
1900 | ||
1901 | ret = lttng_ust_context_set_provider_rcu( | |
1902 | &event_notifier_group->ctx, | |
1903 | name, get_size, record, get_value); | |
1904 | if (ret) | |
1905 | abort(); | |
1906 | } | |
1907 | } |