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" |
4d451c15 | 62 | #include "lttng-bytecode.h" |
7dd08bec MD |
63 | #include "lttng-tracer.h" |
64 | #include "lttng-tracer-core.h" | |
cf73e0fe | 65 | #include "lttng-ust-statedump.h" |
d871c65b | 66 | #include "ust-events-internal.h" |
b728d87e | 67 | #include "wait.h" |
8d8a24c8 | 68 | #include "../libringbuffer/shm.h" |
596c4223 | 69 | #include "jhash.h" |
d8d2416d | 70 | #include <lttng/ust-abi.h> |
8165c8da MD |
71 | |
72 | /* | |
3327ac33 MD |
73 | * All operations within this file are called by the communication |
74 | * thread, under ust_lock protection. | |
8165c8da | 75 | */ |
8165c8da | 76 | |
b5234c06 | 77 | static CDS_LIST_HEAD(sessions); |
d8d2416d | 78 | static CDS_LIST_HEAD(event_notifier_groups); |
8165c8da | 79 | |
37dddb65 MD |
80 | struct cds_list_head *_lttng_get_sessions(void) |
81 | { | |
82 | return &sessions; | |
83 | } | |
84 | ||
7dd08bec | 85 | static void _lttng_event_destroy(struct lttng_event *event); |
d8d2416d FD |
86 | static void _lttng_event_notifier_destroy( |
87 | struct lttng_event_notifier *event_notifier); | |
c785c634 | 88 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 89 | |
e58095ef | 90 | static |
d871c65b | 91 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
e58095ef | 92 | static |
d871c65b | 93 | void lttng_session_sync_event_enablers(struct lttng_session *session); |
e58095ef | 94 | static |
d8d2416d FD |
95 | void lttng_event_notifier_group_sync_enablers( |
96 | struct lttng_event_notifier_group *event_notifier_group); | |
97 | static | |
e58095ef MD |
98 | void lttng_enabler_destroy(struct lttng_enabler *enabler); |
99 | ||
6715d7d1 MD |
100 | /* |
101 | * Called with ust lock held. | |
102 | */ | |
103 | int lttng_session_active(void) | |
104 | { | |
105 | struct lttng_session *iter; | |
106 | ||
107 | cds_list_for_each_entry(iter, &sessions, node) { | |
108 | if (iter->active) | |
109 | return 1; | |
110 | } | |
111 | return 0; | |
112 | } | |
113 | ||
e58095ef MD |
114 | static |
115 | int lttng_loglevel_match(int loglevel, | |
116 | unsigned int has_loglevel, | |
457a6b58 MD |
117 | enum lttng_ust_loglevel_type req_type, |
118 | int req_loglevel) | |
119 | { | |
e58095ef MD |
120 | if (!has_loglevel) |
121 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
122 | switch (req_type) { |
123 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 124 | if (loglevel <= req_loglevel |
67ada458 | 125 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
126 | return 1; |
127 | else | |
128 | return 0; | |
129 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 130 | if (loglevel == req_loglevel |
67ada458 | 131 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
132 | return 1; |
133 | else | |
134 | return 0; | |
135 | case LTTNG_UST_LOGLEVEL_ALL: | |
136 | default: | |
67ada458 | 137 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
138 | return 1; |
139 | else | |
140 | return 0; | |
457a6b58 MD |
141 | } |
142 | } | |
143 | ||
8020ceb5 MD |
144 | void synchronize_trace(void) |
145 | { | |
8020ceb5 | 146 | synchronize_rcu(); |
8020ceb5 MD |
147 | } |
148 | ||
7dd08bec | 149 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 150 | { |
7dd08bec | 151 | struct lttng_session *session; |
74d81a6c | 152 | int i; |
8020ceb5 | 153 | |
7dd08bec | 154 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
155 | if (!session) |
156 | return NULL; | |
53569322 MD |
157 | if (lttng_session_context_init(&session->ctx)) { |
158 | free(session); | |
159 | return NULL; | |
160 | } | |
e58095ef MD |
161 | CDS_INIT_LIST_HEAD(&session->chan_head); |
162 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 163 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 164 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
165 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
166 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
167 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
168 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 169 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
170 | return session; |
171 | } | |
172 | ||
d8d2416d FD |
173 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
174 | { | |
175 | struct lttng_event_notifier_group *event_notifier_group; | |
176 | int i; | |
177 | ||
178 | event_notifier_group = zmalloc(sizeof(struct lttng_event_notifier_group)); | |
179 | if (!event_notifier_group) | |
180 | return NULL; | |
181 | ||
182 | CDS_INIT_LIST_HEAD(&event_notifier_group->enablers_head); | |
183 | CDS_INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
184 | for (i = 0; i < LTTNG_UST_EVENT_NOTIFIER_HT_SIZE; i++) | |
185 | CDS_INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
186 | ||
187 | cds_list_add(&event_notifier_group->node, &event_notifier_groups); | |
188 | ||
189 | return event_notifier_group; | |
190 | } | |
191 | ||
74d81a6c MD |
192 | /* |
193 | * Only used internally at session destruction. | |
194 | */ | |
195 | static | |
196 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
197 | { | |
198 | struct channel *chan; | |
199 | struct lttng_ust_shm_handle *handle; | |
200 | ||
201 | cds_list_del(<tng_chan->node); | |
202 | lttng_destroy_context(lttng_chan->ctx); | |
203 | chan = lttng_chan->chan; | |
204 | handle = lttng_chan->handle; | |
205 | /* | |
206 | * note: lttng_chan is private data contained within handle. It | |
207 | * will be freed along with the handle. | |
208 | */ | |
209 | channel_destroy(chan, handle, 0); | |
210 | } | |
211 | ||
ac6b4ac6 MD |
212 | static |
213 | void register_event(struct lttng_event *event) | |
214 | { | |
215 | int ret; | |
216 | const struct lttng_event_desc *desc; | |
217 | ||
218 | assert(event->registered == 0); | |
219 | desc = event->desc; | |
baa1e0bc | 220 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
221 | desc->probe_callback, |
222 | event, desc->signature); | |
223 | WARN_ON_ONCE(ret); | |
224 | if (!ret) | |
225 | event->registered = 1; | |
226 | } | |
227 | ||
d8d2416d FD |
228 | static |
229 | void register_event_notifier(struct lttng_event_notifier *event_notifier) | |
230 | { | |
231 | int ret; | |
232 | const struct lttng_event_desc *desc; | |
233 | ||
234 | assert(event_notifier->registered == 0); | |
235 | desc = event_notifier->desc; | |
236 | ret = __tracepoint_probe_register_queue_release(desc->name, | |
237 | desc->u.ext.event_notifier_callback, event_notifier, desc->signature); | |
238 | WARN_ON_ONCE(ret); | |
239 | if (!ret) | |
240 | event_notifier->registered = 1; | |
241 | } | |
242 | ||
ac6b4ac6 MD |
243 | static |
244 | void unregister_event(struct lttng_event *event) | |
245 | { | |
246 | int ret; | |
247 | const struct lttng_event_desc *desc; | |
248 | ||
249 | assert(event->registered == 1); | |
250 | desc = event->desc; | |
baa1e0bc | 251 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
252 | desc->probe_callback, |
253 | event); | |
254 | WARN_ON_ONCE(ret); | |
255 | if (!ret) | |
256 | event->registered = 0; | |
257 | } | |
258 | ||
d8d2416d FD |
259 | static |
260 | void unregister_event_notifier(struct lttng_event_notifier *event_notifier) | |
261 | { | |
262 | int ret; | |
263 | const struct lttng_event_desc *desc; | |
264 | ||
265 | assert(event_notifier->registered == 1); | |
266 | desc = event_notifier->desc; | |
267 | ret = __tracepoint_probe_unregister_queue_release(desc->name, | |
268 | desc->u.ext.event_notifier_callback, event_notifier); | |
269 | WARN_ON_ONCE(ret); | |
270 | if (!ret) | |
271 | event_notifier->registered = 0; | |
272 | } | |
273 | ||
ac6b4ac6 MD |
274 | /* |
275 | * Only used internally at session destruction. | |
276 | */ | |
277 | static | |
278 | void _lttng_event_unregister(struct lttng_event *event) | |
279 | { | |
280 | if (event->registered) | |
281 | unregister_event(event); | |
282 | } | |
283 | ||
d8d2416d FD |
284 | /* |
285 | * Only used internally at session destruction. | |
286 | */ | |
287 | static | |
288 | void _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier) | |
289 | { | |
290 | if (event_notifier->registered) | |
291 | unregister_event_notifier(event_notifier); | |
292 | } | |
293 | ||
7dd08bec | 294 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 295 | { |
7dd08bec MD |
296 | struct lttng_channel *chan, *tmpchan; |
297 | struct lttng_event *event, *tmpevent; | |
c785c634 | 298 | struct lttng_enum *_enum, *tmp_enum; |
d871c65b | 299 | struct lttng_event_enabler *event_enabler, *event_tmpenabler; |
8020ceb5 | 300 | |
b5234c06 | 301 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 302 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 303 | _lttng_event_unregister(event); |
8020ceb5 MD |
304 | } |
305 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
baa1e0bc | 306 | __tracepoint_probe_prune_release_queue(); |
d871c65b | 307 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
e58095ef | 308 | &session->enablers_head, node) |
d871c65b | 309 | lttng_event_enabler_destroy(event_enabler); |
e58095ef MD |
310 | cds_list_for_each_entry_safe(event, tmpevent, |
311 | &session->events_head, node) | |
7dd08bec | 312 | _lttng_event_destroy(event); |
c785c634 MD |
313 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
314 | &session->enums_head, node) | |
315 | _lttng_enum_destroy(_enum); | |
e58095ef | 316 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 317 | _lttng_channel_unmap(chan); |
e58095ef | 318 | cds_list_del(&session->node); |
53569322 | 319 | lttng_destroy_context(session->ctx); |
b5234c06 | 320 | free(session); |
8020ceb5 MD |
321 | } |
322 | ||
d8d2416d FD |
323 | void lttng_event_notifier_group_destroy( |
324 | struct lttng_event_notifier_group *event_notifier_group) | |
325 | { | |
326 | int close_ret; | |
327 | struct lttng_event_notifier_enabler *notifier_enabler, *tmpnotifier_enabler; | |
328 | struct lttng_event_notifier *notifier, *tmpnotifier; | |
329 | ||
330 | if (!event_notifier_group) { | |
331 | return; | |
332 | } | |
333 | ||
334 | cds_list_for_each_entry(notifier, | |
335 | &event_notifier_group->event_notifiers_head, node) | |
336 | _lttng_event_notifier_unregister(notifier); | |
337 | ||
338 | synchronize_trace(); | |
339 | ||
340 | cds_list_for_each_entry_safe(notifier_enabler, tmpnotifier_enabler, | |
341 | &event_notifier_group->enablers_head, node) | |
342 | lttng_event_notifier_enabler_destroy(notifier_enabler); | |
343 | ||
344 | cds_list_for_each_entry_safe(notifier, tmpnotifier, | |
345 | &event_notifier_group->event_notifiers_head, node) | |
346 | _lttng_event_notifier_destroy(notifier); | |
347 | ||
348 | /* Close the notification fd to the listener of event notifiers. */ | |
349 | ||
350 | lttng_ust_lock_fd_tracker(); | |
351 | close_ret = close(event_notifier_group->notification_fd); | |
352 | if (!close_ret) { | |
353 | lttng_ust_delete_fd_from_tracker( | |
354 | event_notifier_group->notification_fd); | |
355 | } else { | |
356 | PERROR("close"); | |
357 | abort(); | |
358 | } | |
359 | lttng_ust_unlock_fd_tracker(); | |
360 | ||
361 | cds_list_del(&event_notifier_group->node); | |
362 | ||
363 | free(event_notifier_group); | |
364 | } | |
365 | ||
d871c65b FD |
366 | static |
367 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
368 | { | |
ab249ecf | 369 | struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node; |
d871c65b FD |
370 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
371 | ||
372 | if (!enabler) { | |
373 | return; | |
374 | } | |
375 | ||
376 | /* Destroy filter bytecode */ | |
377 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
378 | &enabler->filter_bytecode_head, node) { | |
379 | free(filter_node); | |
380 | } | |
381 | ||
382 | /* Destroy excluders */ | |
383 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
384 | &enabler->excluder_head, node) { | |
385 | free(excluder_node); | |
386 | } | |
387 | } | |
388 | ||
d8d2416d FD |
389 | void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler) |
390 | { | |
391 | if (!event_notifier_enabler) { | |
392 | return; | |
393 | } | |
394 | ||
395 | cds_list_del(&event_notifier_enabler->node); | |
396 | ||
397 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
398 | ||
399 | free(event_notifier_enabler); | |
400 | } | |
401 | ||
53569322 MD |
402 | static |
403 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
404 | struct lttng_session *session) | |
405 | { | |
406 | const char *enum_name = desc->name; | |
407 | struct lttng_enum *_enum; | |
408 | struct cds_hlist_head *head; | |
53569322 MD |
409 | int ret = 0; |
410 | size_t name_len = strlen(enum_name); | |
411 | uint32_t hash; | |
412 | int notify_socket; | |
413 | ||
b33b46f7 | 414 | /* Check if this enum is already registered for this session. */ |
53569322 MD |
415 | hash = jhash(enum_name, name_len, 0); |
416 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
b33b46f7 FD |
417 | |
418 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
419 | if (_enum) { | |
420 | ret = -EEXIST; | |
421 | goto exist; | |
53569322 MD |
422 | } |
423 | ||
424 | notify_socket = lttng_get_notify_socket(session->owner); | |
425 | if (notify_socket < 0) { | |
426 | ret = notify_socket; | |
427 | goto socket_error; | |
428 | } | |
429 | ||
430 | _enum = zmalloc(sizeof(*_enum)); | |
431 | if (!_enum) { | |
432 | ret = -ENOMEM; | |
433 | goto cache_error; | |
434 | } | |
435 | _enum->session = session; | |
436 | _enum->desc = desc; | |
437 | ||
438 | ret = ustcomm_register_enum(notify_socket, | |
439 | session->objd, | |
440 | enum_name, | |
441 | desc->nr_entries, | |
442 | desc->entries, | |
443 | &_enum->id); | |
444 | if (ret < 0) { | |
445 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
446 | goto sessiond_register_error; | |
447 | } | |
448 | cds_list_add(&_enum->node, &session->enums_head); | |
449 | cds_hlist_add_head(&_enum->hlist, head); | |
450 | return 0; | |
451 | ||
452 | sessiond_register_error: | |
453 | free(_enum); | |
454 | cache_error: | |
455 | socket_error: | |
456 | exist: | |
457 | return ret; | |
458 | } | |
459 | ||
460 | static | |
461 | int lttng_create_enum_check(const struct lttng_type *type, | |
462 | struct lttng_session *session) | |
463 | { | |
464 | switch (type->atype) { | |
465 | case atype_enum: | |
466 | { | |
467 | const struct lttng_enum_desc *enum_desc; | |
468 | int ret; | |
469 | ||
218deb69 MD |
470 | enum_desc = type->u.legacy.basic.enumeration.desc; |
471 | ret = lttng_enum_create(enum_desc, session); | |
472 | if (ret && ret != -EEXIST) { | |
473 | DBG("Unable to create enum error: (%d)", ret); | |
474 | return ret; | |
475 | } | |
476 | break; | |
477 | } | |
478 | case atype_enum_nestable: | |
479 | { | |
480 | const struct lttng_enum_desc *enum_desc; | |
481 | int ret; | |
482 | ||
483 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
484 | ret = lttng_enum_create(enum_desc, session); |
485 | if (ret && ret != -EEXIST) { | |
486 | DBG("Unable to create enum error: (%d)", ret); | |
487 | return ret; | |
488 | } | |
489 | break; | |
490 | } | |
491 | case atype_dynamic: | |
492 | { | |
493 | const struct lttng_event_field *tag_field_generic; | |
494 | const struct lttng_enum_desc *enum_desc; | |
495 | int ret; | |
496 | ||
497 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 498 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
499 | ret = lttng_enum_create(enum_desc, session); |
500 | if (ret && ret != -EEXIST) { | |
501 | DBG("Unable to create enum error: (%d)", ret); | |
502 | return ret; | |
503 | } | |
504 | break; | |
505 | } | |
506 | default: | |
507 | /* TODO: nested types when they become supported. */ | |
508 | break; | |
509 | } | |
510 | return 0; | |
511 | } | |
512 | ||
513 | static | |
514 | int lttng_create_all_event_enums(size_t nr_fields, | |
515 | const struct lttng_event_field *event_fields, | |
516 | struct lttng_session *session) | |
517 | { | |
518 | size_t i; | |
519 | int ret; | |
520 | ||
521 | /* For each field, ensure enum is part of the session. */ | |
522 | for (i = 0; i < nr_fields; i++) { | |
523 | const struct lttng_type *type = &event_fields[i].type; | |
524 | ||
525 | ret = lttng_create_enum_check(type, session); | |
526 | if (ret) | |
527 | return ret; | |
528 | } | |
529 | return 0; | |
530 | } | |
531 | ||
532 | static | |
533 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
534 | const struct lttng_ctx_field *ctx_fields, | |
535 | struct lttng_session *session) | |
536 | { | |
537 | size_t i; | |
538 | int ret; | |
539 | ||
540 | /* For each field, ensure enum is part of the session. */ | |
541 | for (i = 0; i < nr_fields; i++) { | |
542 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
543 | ||
544 | ret = lttng_create_enum_check(type, session); | |
545 | if (ret) | |
546 | return ret; | |
547 | } | |
548 | return 0; | |
549 | } | |
550 | ||
710b8ee3 MD |
551 | /* |
552 | * Ensure that a state-dump will be performed for this session at the end | |
553 | * of the current handle_message(). | |
554 | */ | |
555 | int lttng_session_statedump(struct lttng_session *session) | |
556 | { | |
557 | session->statedump_pending = 1; | |
558 | lttng_ust_sockinfo_session_enabled(session->owner); | |
559 | return 0; | |
560 | } | |
53569322 | 561 | |
7dd08bec | 562 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
563 | { |
564 | int ret = 0; | |
7dd08bec | 565 | struct lttng_channel *chan; |
32ce8569 | 566 | int notify_socket; |
8020ceb5 | 567 | |
8020ceb5 MD |
568 | if (session->active) { |
569 | ret = -EBUSY; | |
570 | goto end; | |
571 | } | |
572 | ||
32ce8569 MD |
573 | notify_socket = lttng_get_notify_socket(session->owner); |
574 | if (notify_socket < 0) | |
575 | return notify_socket; | |
576 | ||
ac6b4ac6 MD |
577 | /* Set transient enabler state to "enabled" */ |
578 | session->tstate = 1; | |
e58095ef | 579 | |
3ff7660f | 580 | /* We need to sync enablers with session before activation. */ |
d871c65b | 581 | lttng_session_sync_event_enablers(session); |
3ff7660f | 582 | |
8020ceb5 MD |
583 | /* |
584 | * Snapshot the number of events per channel to know the type of header | |
585 | * we need to use. | |
586 | */ | |
e58095ef | 587 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 588 | const struct lttng_ctx *ctx; |
83e43212 | 589 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 590 | size_t nr_fields = 0; |
6ca18e66 | 591 | uint32_t chan_id; |
32ce8569 MD |
592 | |
593 | /* don't change it if session stop/restart */ | |
8020ceb5 | 594 | if (chan->header_type) |
32ce8569 MD |
595 | continue; |
596 | ctx = chan->ctx; | |
597 | if (ctx) { | |
598 | nr_fields = ctx->nr_fields; | |
83e43212 | 599 | fields = ctx->fields; |
53569322 MD |
600 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
601 | session); | |
602 | if (ret < 0) { | |
603 | DBG("Error (%d) adding enum to session", ret); | |
604 | return ret; | |
605 | } | |
32ce8569 MD |
606 | } |
607 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 608 | session, |
32ce8569 MD |
609 | session->objd, |
610 | chan->objd, | |
611 | nr_fields, | |
612 | fields, | |
6ca18e66 | 613 | &chan_id, |
32ce8569 | 614 | &chan->header_type); |
b869b5ae MD |
615 | if (ret) { |
616 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 617 | return ret; |
b869b5ae | 618 | } |
6ca18e66 MD |
619 | if (chan_id != chan->id) { |
620 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
621 | chan_id, chan->id); | |
622 | return -EINVAL; | |
623 | } | |
8020ceb5 MD |
624 | } |
625 | ||
ac6b4ac6 | 626 | /* Set atomically the state to "active" */ |
b5234c06 MD |
627 | CMM_ACCESS_ONCE(session->active) = 1; |
628 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 629 | |
710b8ee3 MD |
630 | ret = lttng_session_statedump(session); |
631 | if (ret) | |
632 | return ret; | |
8020ceb5 | 633 | end: |
8020ceb5 MD |
634 | return ret; |
635 | } | |
636 | ||
7dd08bec | 637 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
638 | { |
639 | int ret = 0; | |
640 | ||
8020ceb5 MD |
641 | if (!session->active) { |
642 | ret = -EBUSY; | |
643 | goto end; | |
644 | } | |
ac6b4ac6 | 645 | /* Set atomically the state to "inactive" */ |
b5234c06 | 646 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
647 | |
648 | /* Set transient enabler state to "disabled" */ | |
649 | session->tstate = 0; | |
d871c65b | 650 | lttng_session_sync_event_enablers(session); |
8020ceb5 | 651 | end: |
8020ceb5 MD |
652 | return ret; |
653 | } | |
654 | ||
7dd08bec | 655 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 656 | { |
ac6b4ac6 | 657 | int ret = 0; |
976fe9ea | 658 | |
ac6b4ac6 MD |
659 | if (channel->enabled) { |
660 | ret = -EBUSY; | |
661 | goto end; | |
662 | } | |
663 | /* Set transient enabler state to "enabled" */ | |
664 | channel->tstate = 1; | |
d871c65b | 665 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
666 | /* Set atomically the state to "enabled" */ |
667 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
668 | end: | |
669 | return ret; | |
976fe9ea MD |
670 | } |
671 | ||
7dd08bec | 672 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 673 | { |
ac6b4ac6 | 674 | int ret = 0; |
976fe9ea | 675 | |
ac6b4ac6 MD |
676 | if (!channel->enabled) { |
677 | ret = -EBUSY; | |
678 | goto end; | |
679 | } | |
680 | /* Set atomically the state to "disabled" */ | |
681 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
682 | /* Set transient enabler state to "enabled" */ | |
683 | channel->tstate = 0; | |
d871c65b | 684 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
685 | end: |
686 | return ret; | |
976fe9ea MD |
687 | } |
688 | ||
fb470188 FD |
689 | static inline |
690 | struct cds_hlist_head *borrow_hash_table_bucket( | |
691 | struct cds_hlist_head *hash_table, | |
692 | unsigned int hash_table_size, | |
693 | const struct lttng_event_desc *desc) | |
694 | { | |
695 | const char *event_name; | |
696 | size_t name_len; | |
697 | uint32_t hash; | |
698 | ||
699 | event_name = desc->name; | |
700 | name_len = strlen(event_name); | |
701 | ||
702 | hash = jhash(event_name, name_len, 0); | |
703 | return &hash_table[hash & (hash_table_size - 1)]; | |
704 | } | |
705 | ||
8020ceb5 MD |
706 | /* |
707 | * Supports event creation while tracing session is active. | |
708 | */ | |
e58095ef MD |
709 | static |
710 | int lttng_event_create(const struct lttng_event_desc *desc, | |
711 | struct lttng_channel *chan) | |
8020ceb5 | 712 | { |
7dd08bec | 713 | struct lttng_event *event; |
32ce8569 | 714 | struct lttng_session *session = chan->session; |
d56fa719 | 715 | struct cds_hlist_head *head; |
576599a0 | 716 | int ret = 0; |
32ce8569 MD |
717 | int notify_socket, loglevel; |
718 | const char *uri; | |
8020ceb5 | 719 | |
fb470188 FD |
720 | head = borrow_hash_table_bucket(chan->session->events_ht.table, |
721 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
457a6b58 | 722 | |
32ce8569 MD |
723 | notify_socket = lttng_get_notify_socket(session->owner); |
724 | if (notify_socket < 0) { | |
725 | ret = notify_socket; | |
726 | goto socket_error; | |
727 | } | |
728 | ||
53569322 MD |
729 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
730 | session); | |
c785c634 MD |
731 | if (ret < 0) { |
732 | DBG("Error (%d) adding enum to session", ret); | |
733 | goto create_enum_error; | |
734 | } | |
735 | ||
457a6b58 MD |
736 | /* |
737 | * Check if loglevel match. Refuse to connect event if not. | |
738 | */ | |
7dd08bec | 739 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
740 | if (!event) { |
741 | ret = -ENOMEM; | |
8020ceb5 | 742 | goto cache_error; |
576599a0 | 743 | } |
8020ceb5 | 744 | event->chan = chan; |
e58095ef | 745 | |
ac6b4ac6 MD |
746 | /* Event will be enabled by enabler sync. */ |
747 | event->enabled = 0; | |
748 | event->registered = 0; | |
a56fd376 | 749 | CDS_INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
e58095ef MD |
750 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); |
751 | event->desc = desc; | |
32ce8569 MD |
752 | |
753 | if (desc->loglevel) | |
754 | loglevel = *(*event->desc->loglevel); | |
755 | else | |
756 | loglevel = TRACE_DEFAULT; | |
757 | if (desc->u.ext.model_emf_uri) | |
758 | uri = *(desc->u.ext.model_emf_uri); | |
759 | else | |
760 | uri = NULL; | |
761 | ||
13b21cd6 MD |
762 | /* Fetch event ID from sessiond */ |
763 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 764 | session, |
13b21cd6 MD |
765 | session->objd, |
766 | chan->objd, | |
fb470188 | 767 | desc->name, |
13b21cd6 MD |
768 | loglevel, |
769 | desc->signature, | |
770 | desc->nr_fields, | |
771 | desc->fields, | |
772 | uri, | |
773 | &event->id); | |
774 | if (ret < 0) { | |
775 | DBG("Error (%d) registering event to sessiond", ret); | |
776 | goto sessiond_register_error; | |
32ce8569 | 777 | } |
2b213b16 | 778 | |
e58095ef | 779 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 780 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 781 | return 0; |
8020ceb5 | 782 | |
32ce8569 | 783 | sessiond_register_error: |
b5234c06 | 784 | free(event); |
8020ceb5 | 785 | cache_error: |
c785c634 | 786 | create_enum_error: |
32ce8569 | 787 | socket_error: |
576599a0 | 788 | return ret; |
8020ceb5 MD |
789 | } |
790 | ||
d8d2416d FD |
791 | static |
792 | int lttng_event_notifier_create(const struct lttng_event_desc *desc, | |
793 | uint64_t token, | |
794 | struct lttng_event_notifier_group *event_notifier_group) | |
795 | { | |
796 | struct lttng_event_notifier *event_notifier; | |
797 | struct cds_hlist_head *head; | |
798 | int ret = 0; | |
799 | ||
800 | /* | |
801 | * Get the hashtable bucket the created lttng_event_notifier object | |
802 | * should be inserted. | |
803 | */ | |
804 | head = borrow_hash_table_bucket( | |
805 | event_notifier_group->event_notifiers_ht.table, | |
806 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
807 | ||
808 | event_notifier = zmalloc(sizeof(struct lttng_event_notifier)); | |
809 | if (!event_notifier) { | |
810 | ret = -ENOMEM; | |
811 | goto error; | |
812 | } | |
813 | ||
814 | event_notifier->group = event_notifier_group; | |
815 | event_notifier->user_token = token; | |
816 | ||
817 | /* Event notifier will be enabled by enabler sync. */ | |
818 | event_notifier->enabled = 0; | |
819 | event_notifier->registered = 0; | |
820 | ||
821 | CDS_INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); | |
822 | CDS_INIT_LIST_HEAD(&event_notifier->enablers_ref_head); | |
823 | event_notifier->desc = desc; | |
824 | ||
825 | cds_list_add(&event_notifier->node, | |
826 | &event_notifier_group->event_notifiers_head); | |
827 | cds_hlist_add_head(&event_notifier->hlist, head); | |
828 | ||
829 | return 0; | |
830 | ||
831 | error: | |
832 | return ret; | |
833 | } | |
834 | ||
835 | static | |
836 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
837 | { | |
838 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
839 | ||
840 | /* Remove from event_notifier list. */ | |
841 | cds_list_del(&event_notifier->node); | |
842 | /* Remove from event_notifier hash table. */ | |
843 | cds_hlist_del(&event_notifier->hlist); | |
844 | ||
845 | lttng_free_event_notifier_filter_runtime(event_notifier); | |
846 | ||
847 | /* Free event_notifier enabler refs */ | |
848 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
849 | &event_notifier->enablers_ref_head, node) | |
850 | free(enabler_ref); | |
851 | free(event_notifier); | |
852 | } | |
853 | ||
e58095ef | 854 | static |
196ec2df | 855 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
856 | struct lttng_enabler *enabler) |
857 | { | |
858 | int loglevel = 0; | |
7e2e405c | 859 | unsigned int has_loglevel = 0; |
e58095ef | 860 | |
e450e339 | 861 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f6f42e6 MD |
862 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
863 | desc->name, SIZE_MAX)) | |
e58095ef MD |
864 | return 0; |
865 | if (desc->loglevel) { | |
866 | loglevel = *(*desc->loglevel); | |
867 | has_loglevel = 1; | |
868 | } | |
869 | if (!lttng_loglevel_match(loglevel, | |
870 | has_loglevel, | |
871 | enabler->event_param.loglevel_type, | |
872 | enabler->event_param.loglevel)) | |
873 | return 0; | |
874 | return 1; | |
875 | } | |
876 | ||
877 | static | |
878 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
879 | struct lttng_enabler *enabler) | |
880 | { | |
881 | int loglevel = 0; | |
882 | unsigned int has_loglevel = 0; | |
883 | ||
e450e339 | 884 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
e58095ef MD |
885 | if (strcmp(desc->name, enabler->event_param.name)) |
886 | return 0; | |
887 | if (desc->loglevel) { | |
888 | loglevel = *(*desc->loglevel); | |
889 | has_loglevel = 1; | |
890 | } | |
891 | if (!lttng_loglevel_match(loglevel, | |
892 | has_loglevel, | |
893 | enabler->event_param.loglevel_type, | |
894 | enabler->event_param.loglevel)) | |
895 | return 0; | |
896 | return 1; | |
897 | } | |
898 | ||
899 | static | |
900 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
901 | struct lttng_enabler *enabler) | |
902 | { | |
e450e339 FD |
903 | switch (enabler->format_type) { |
904 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
196ec2df PP |
905 | { |
906 | struct lttng_ust_excluder_node *excluder; | |
907 | ||
908 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
909 | return 0; | |
910 | } | |
911 | ||
912 | /* | |
913 | * If the matching event matches with an excluder, | |
914 | * return 'does not match' | |
915 | */ | |
916 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
917 | int count; | |
918 | ||
919 | for (count = 0; count < excluder->excluder.count; count++) { | |
920 | int len; | |
921 | char *excluder_name; | |
922 | ||
923 | excluder_name = (char *) (excluder->excluder.names) | |
924 | + count * LTTNG_UST_SYM_NAME_LEN; | |
925 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 926 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 927 | return 0; |
ed5b5bbd JI |
928 | } |
929 | } | |
196ec2df | 930 | return 1; |
ed5b5bbd | 931 | } |
e450e339 | 932 | case LTTNG_ENABLER_FORMAT_EVENT: |
e58095ef MD |
933 | return lttng_desc_match_event_enabler(desc, enabler); |
934 | default: | |
935 | return -EINVAL; | |
936 | } | |
937 | } | |
938 | ||
939 | static | |
d871c65b FD |
940 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
941 | struct lttng_event *event) | |
e58095ef | 942 | { |
d871c65b FD |
943 | if (lttng_desc_match_enabler(event->desc, |
944 | lttng_event_enabler_as_enabler(event_enabler)) | |
945 | && event->chan == event_enabler->chan) | |
d970f72e MD |
946 | return 1; |
947 | else | |
948 | return 0; | |
e58095ef MD |
949 | } |
950 | ||
d8d2416d FD |
951 | static |
952 | int lttng_event_notifier_enabler_match_event_notifier( | |
953 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
954 | struct lttng_event_notifier *event_notifier) | |
955 | { | |
956 | int desc_matches = lttng_desc_match_enabler(event_notifier->desc, | |
957 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
958 | ||
959 | if (desc_matches && event_notifier->group == event_notifier_enabler->group && | |
960 | event_notifier->user_token == event_notifier_enabler->user_token) | |
961 | return 1; | |
962 | else | |
963 | return 0; | |
964 | } | |
965 | ||
e58095ef | 966 | static |
d871c65b FD |
967 | struct lttng_enabler_ref *lttng_enabler_ref( |
968 | struct cds_list_head *enabler_ref_list, | |
e58095ef MD |
969 | struct lttng_enabler *enabler) |
970 | { | |
971 | struct lttng_enabler_ref *enabler_ref; | |
972 | ||
d871c65b | 973 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
e58095ef MD |
974 | if (enabler_ref->ref == enabler) |
975 | return enabler_ref; | |
976 | } | |
977 | return NULL; | |
978 | } | |
979 | ||
8020ceb5 | 980 | /* |
e58095ef MD |
981 | * Create struct lttng_event if it is missing and present in the list of |
982 | * tracepoint probes. | |
8020ceb5 | 983 | */ |
e58095ef | 984 | static |
d871c65b | 985 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 986 | { |
d871c65b | 987 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
988 | struct lttng_probe_desc *probe_desc; |
989 | const struct lttng_event_desc *desc; | |
990 | struct lttng_event *event; | |
991 | int i; | |
992 | struct cds_list_head *probe_list; | |
993 | ||
994 | probe_list = lttng_get_probe_list_head(); | |
995 | /* | |
996 | * For each probe event, if we find that a probe event matches | |
997 | * our enabler, create an associated lttng_event if not | |
998 | * already present. | |
999 | */ | |
1000 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1001 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
1002 | int ret; |
1003 | bool found = false; | |
d56fa719 MD |
1004 | struct cds_hlist_head *head; |
1005 | struct cds_hlist_node *node; | |
e58095ef MD |
1006 | |
1007 | desc = probe_desc->event_desc[i]; | |
d871c65b FD |
1008 | if (!lttng_desc_match_enabler(desc, |
1009 | lttng_event_enabler_as_enabler(event_enabler))) | |
e58095ef MD |
1010 | continue; |
1011 | ||
fb470188 FD |
1012 | head = borrow_hash_table_bucket( |
1013 | session->events_ht.table, | |
1014 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
1015 | ||
d56fa719 | 1016 | cds_hlist_for_each_entry(event, node, head, hlist) { |
d970f72e | 1017 | if (event->desc == desc |
d871c65b | 1018 | && event->chan == event_enabler->chan) { |
98a97f24 | 1019 | found = true; |
3140bffe FD |
1020 | break; |
1021 | } | |
e58095ef MD |
1022 | } |
1023 | if (found) | |
1024 | continue; | |
1025 | ||
1026 | /* | |
1027 | * We need to create an event for this | |
1028 | * event probe. | |
1029 | */ | |
1030 | ret = lttng_event_create(probe_desc->event_desc[i], | |
d871c65b | 1031 | event_enabler->chan); |
e58095ef | 1032 | if (ret) { |
32ce8569 MD |
1033 | DBG("Unable to create event %s, error %d\n", |
1034 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 1035 | } |
8165c8da | 1036 | } |
8020ceb5 | 1037 | } |
8020ceb5 MD |
1038 | } |
1039 | ||
a44d07da FD |
1040 | static |
1041 | void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc, | |
d8d2416d FD |
1042 | void (*event_func)(struct lttng_session *session, |
1043 | struct lttng_event *event), | |
1044 | void (*event_notifier_func)(struct lttng_event_notifier *event_notifier)) | |
35ac38cb FD |
1045 | { |
1046 | struct cds_hlist_node *node, *tmp_node; | |
1047 | struct cds_list_head *sessionsp; | |
a44d07da | 1048 | unsigned int i; |
35ac38cb FD |
1049 | |
1050 | /* Get handle on list of sessions. */ | |
1051 | sessionsp = _lttng_get_sessions(); | |
1052 | ||
1053 | /* | |
a44d07da FD |
1054 | * Iterate over all events in the probe provider descriptions and |
1055 | * sessions to queue the unregistration of the events. | |
35ac38cb FD |
1056 | */ |
1057 | for (i = 0; i < provider_desc->nr_events; i++) { | |
1058 | const struct lttng_event_desc *event_desc; | |
d8d2416d FD |
1059 | struct lttng_event_notifier_group *event_notifier_group; |
1060 | struct lttng_event_notifier *event_notifier; | |
a44d07da FD |
1061 | struct lttng_session *session; |
1062 | struct cds_hlist_head *head; | |
1063 | struct lttng_event *event; | |
35ac38cb FD |
1064 | |
1065 | event_desc = provider_desc->event_desc[i]; | |
35ac38cb | 1066 | |
a44d07da FD |
1067 | /* |
1068 | * Iterate over all session to find the current event | |
1069 | * description. | |
1070 | */ | |
35ac38cb FD |
1071 | cds_list_for_each_entry(session, sessionsp, node) { |
1072 | /* | |
a44d07da FD |
1073 | * Get the list of events in the hashtable bucket and |
1074 | * iterate to find the event matching this descriptor. | |
35ac38cb | 1075 | */ |
fb470188 FD |
1076 | head = borrow_hash_table_bucket( |
1077 | session->events_ht.table, | |
1078 | LTTNG_UST_EVENT_HT_SIZE, event_desc); | |
1079 | ||
a44d07da | 1080 | cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) { |
35ac38cb | 1081 | if (event_desc == event->desc) { |
a44d07da | 1082 | event_func(session, event); |
35ac38cb FD |
1083 | break; |
1084 | } | |
1085 | } | |
1086 | } | |
d8d2416d FD |
1087 | |
1088 | /* | |
1089 | * Iterate over all event_notifier groups to find the current event | |
1090 | * description. | |
1091 | */ | |
1092 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1093 | /* | |
1094 | * Get the list of event_notifiers in the hashtable bucket and | |
1095 | * iterate to find the event_notifier matching this | |
1096 | * descriptor. | |
1097 | */ | |
1098 | head = borrow_hash_table_bucket( | |
1099 | event_notifier_group->event_notifiers_ht.table, | |
1100 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, event_desc); | |
1101 | ||
1102 | cds_hlist_for_each_entry_safe(event_notifier, node, tmp_node, head, hlist) { | |
1103 | if (event_desc == event_notifier->desc) { | |
1104 | event_notifier_func(event_notifier); | |
1105 | break; | |
1106 | } | |
1107 | } | |
1108 | } | |
35ac38cb | 1109 | } |
a44d07da FD |
1110 | } |
1111 | ||
1112 | static | |
1113 | void _unregister_event(struct lttng_session *session, | |
1114 | struct lttng_event *event) | |
1115 | { | |
1116 | _lttng_event_unregister(event); | |
1117 | } | |
1118 | ||
1119 | static | |
1120 | void _event_enum_destroy(struct lttng_session *session, | |
1121 | struct lttng_event *event) | |
1122 | { | |
1123 | unsigned int i; | |
1124 | ||
1125 | /* Destroy enums of the current event. */ | |
1126 | for (i = 0; i < event->desc->nr_fields; i++) { | |
1127 | const struct lttng_enum_desc *enum_desc; | |
1128 | const struct lttng_event_field *field; | |
1129 | struct lttng_enum *curr_enum; | |
1130 | ||
1131 | field = &(event->desc->fields[i]); | |
1132 | switch (field->type.atype) { | |
1133 | case atype_enum: | |
1134 | enum_desc = field->type.u.legacy.basic.enumeration.desc; | |
1135 | break; | |
1136 | case atype_enum_nestable: | |
1137 | enum_desc = field->type.u.enum_nestable.desc; | |
1138 | break; | |
1139 | default: | |
1140 | continue; | |
1141 | } | |
1142 | ||
1143 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); | |
1144 | if (curr_enum) { | |
1145 | _lttng_enum_destroy(curr_enum); | |
1146 | } | |
1147 | } | |
1148 | ||
1149 | /* Destroy event. */ | |
1150 | _lttng_event_destroy(event); | |
1151 | } | |
1152 | ||
1153 | /* | |
1154 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
1155 | * the probe provider descriptor received as argument. Must me called with the | |
1156 | * ust_lock held. | |
1157 | */ | |
1158 | void lttng_probe_provider_unregister_events( | |
1159 | struct lttng_probe_desc *provider_desc) | |
1160 | { | |
1161 | /* | |
1162 | * Iterate over all events in the probe provider descriptions and sessions | |
1163 | * to queue the unregistration of the events. | |
1164 | */ | |
d8d2416d FD |
1165 | probe_provider_event_for_each(provider_desc, _unregister_event, |
1166 | _lttng_event_notifier_unregister); | |
35ac38cb FD |
1167 | |
1168 | /* Wait for grace period. */ | |
1169 | synchronize_trace(); | |
1170 | /* Prune the unregistration queue. */ | |
1171 | __tracepoint_probe_prune_release_queue(); | |
1172 | ||
1173 | /* | |
1174 | * It is now safe to destroy the events and remove them from the event list | |
1175 | * and hashtables. | |
1176 | */ | |
d8d2416d FD |
1177 | probe_provider_event_for_each(provider_desc, _event_enum_destroy, |
1178 | _lttng_event_notifier_destroy); | |
35ac38cb FD |
1179 | } |
1180 | ||
8020ceb5 | 1181 | /* |
d8d2416d | 1182 | * Create events associated with an event enabler (if not already present), |
e58095ef | 1183 | * and add backward reference from the event to the enabler. |
8020ceb5 MD |
1184 | */ |
1185 | static | |
d871c65b | 1186 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1187 | { |
d871c65b | 1188 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1189 | struct lttng_event *event; |
1190 | ||
d871c65b | 1191 | if (!lttng_event_enabler_as_enabler(event_enabler)->enabled) |
de713d8a FD |
1192 | goto end; |
1193 | ||
e58095ef | 1194 | /* First ensure that probe events are created for this enabler. */ |
d871c65b | 1195 | lttng_create_event_if_missing(event_enabler); |
e58095ef MD |
1196 | |
1197 | /* For each event matching enabler in session event list. */ | |
1198 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1199 | struct lttng_enabler_ref *enabler_ref; | |
1200 | ||
d871c65b | 1201 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
e58095ef MD |
1202 | continue; |
1203 | ||
d871c65b FD |
1204 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
1205 | lttng_event_enabler_as_enabler(event_enabler)); | |
e58095ef MD |
1206 | if (!enabler_ref) { |
1207 | /* | |
1208 | * If no backward ref, create it. | |
1209 | * Add backward ref from event to enabler. | |
1210 | */ | |
1211 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1212 | if (!enabler_ref) | |
1213 | return -ENOMEM; | |
d871c65b FD |
1214 | enabler_ref->ref = lttng_event_enabler_as_enabler( |
1215 | event_enabler); | |
e58095ef MD |
1216 | cds_list_add(&enabler_ref->node, |
1217 | &event->enablers_ref_head); | |
8165c8da | 1218 | } |
e58095ef MD |
1219 | |
1220 | /* | |
1221 | * Link filter bytecodes if not linked yet. | |
1222 | */ | |
53b9d7db FD |
1223 | lttng_enabler_link_bytecode(event->desc, |
1224 | &session->ctx, | |
a56fd376 | 1225 | &event->filter_bytecode_runtime_head, |
621c07fc | 1226 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
e58095ef MD |
1227 | |
1228 | /* TODO: merge event context. */ | |
1229 | } | |
de713d8a | 1230 | end: |
e58095ef MD |
1231 | return 0; |
1232 | } | |
1233 | ||
1234 | /* | |
1235 | * Called at library load: connect the probe on all enablers matching | |
1236 | * this event. | |
5f733922 | 1237 | * Called with session mutex held. |
e58095ef | 1238 | */ |
5f733922 | 1239 | int lttng_fix_pending_events(void) |
e58095ef MD |
1240 | { |
1241 | struct lttng_session *session; | |
1242 | ||
1243 | cds_list_for_each_entry(session, &sessions, node) { | |
d871c65b | 1244 | lttng_session_lazy_sync_event_enablers(session); |
8020ceb5 | 1245 | } |
e58095ef MD |
1246 | return 0; |
1247 | } | |
1248 | ||
d8d2416d FD |
1249 | int lttng_fix_pending_event_notifiers(void) |
1250 | { | |
1251 | struct lttng_event_notifier_group *event_notifier_group; | |
1252 | ||
1253 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1254 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1255 | } | |
1256 | return 0; | |
1257 | } | |
1258 | ||
246be17e | 1259 | /* |
37dddb65 MD |
1260 | * For each session of the owner thread, execute pending statedump. |
1261 | * Only dump state for the sessions owned by the caller thread, because | |
1262 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 1263 | */ |
3327ac33 | 1264 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
1265 | { |
1266 | struct lttng_session *session; | |
1267 | ||
37dddb65 | 1268 | /* Execute state dump */ |
cf73e0fe | 1269 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
1270 | |
1271 | /* Clear pending state dump */ | |
3327ac33 MD |
1272 | if (ust_lock()) { |
1273 | goto end; | |
1274 | } | |
246be17e | 1275 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
1276 | if (session->owner != owner) |
1277 | continue; | |
1278 | if (!session->statedump_pending) | |
1279 | continue; | |
1280 | session->statedump_pending = 0; | |
246be17e | 1281 | } |
3327ac33 | 1282 | end: |
37dddb65 | 1283 | ust_unlock(); |
3327ac33 | 1284 | return; |
246be17e PW |
1285 | } |
1286 | ||
e58095ef MD |
1287 | /* |
1288 | * Only used internally at session destruction. | |
1289 | */ | |
1290 | static | |
1291 | void _lttng_event_destroy(struct lttng_event *event) | |
1292 | { | |
1293 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1294 | ||
35ac38cb | 1295 | /* Remove from event list. */ |
e58095ef | 1296 | cds_list_del(&event->node); |
35ac38cb FD |
1297 | /* Remove from event hash table. */ |
1298 | cds_hlist_del(&event->hlist); | |
1299 | ||
8020ceb5 | 1300 | lttng_destroy_context(event->ctx); |
f488575f | 1301 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1302 | /* Free event enabler refs */ |
1303 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1304 | &event->enablers_ref_head, node) | |
1305 | free(enabler_ref); | |
b5234c06 | 1306 | free(event); |
8020ceb5 MD |
1307 | } |
1308 | ||
c785c634 MD |
1309 | static |
1310 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1311 | { | |
1312 | cds_list_del(&_enum->node); | |
35ac38cb | 1313 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1314 | free(_enum); |
1315 | } | |
1316 | ||
003fedf4 | 1317 | void lttng_ust_events_exit(void) |
8020ceb5 | 1318 | { |
7dd08bec | 1319 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1320 | |
e58095ef | 1321 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1322 | lttng_session_destroy(session); |
8020ceb5 | 1323 | } |
457a6b58 | 1324 | |
e58095ef MD |
1325 | /* |
1326 | * Enabler management. | |
1327 | */ | |
d871c65b FD |
1328 | struct lttng_event_enabler *lttng_event_enabler_create( |
1329 | enum lttng_enabler_format_type format_type, | |
e58095ef MD |
1330 | struct lttng_ust_event *event_param, |
1331 | struct lttng_channel *chan) | |
457a6b58 | 1332 | { |
d871c65b | 1333 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1334 | |
d871c65b FD |
1335 | event_enabler = zmalloc(sizeof(*event_enabler)); |
1336 | if (!event_enabler) | |
e58095ef | 1337 | return NULL; |
d871c65b FD |
1338 | event_enabler->base.format_type = format_type; |
1339 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1340 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); | |
1341 | memcpy(&event_enabler->base.event_param, event_param, | |
1342 | sizeof(event_enabler->base.event_param)); | |
1343 | event_enabler->chan = chan; | |
e58095ef | 1344 | /* ctx left NULL */ |
d871c65b FD |
1345 | event_enabler->base.enabled = 0; |
1346 | cds_list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); | |
1347 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1348 | ||
1349 | return event_enabler; | |
457a6b58 MD |
1350 | } |
1351 | ||
d8d2416d FD |
1352 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
1353 | struct lttng_event_notifier_group *event_notifier_group, | |
1354 | enum lttng_enabler_format_type format_type, | |
1355 | struct lttng_ust_event_notifier *event_notifier_param) | |
1356 | { | |
1357 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1358 | ||
1359 | event_notifier_enabler = zmalloc(sizeof(*event_notifier_enabler)); | |
1360 | if (!event_notifier_enabler) | |
1361 | return NULL; | |
1362 | event_notifier_enabler->base.format_type = format_type; | |
1363 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
1364 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.excluder_head); | |
1365 | ||
1366 | event_notifier_enabler->user_token = event_notifier_param->event.token; | |
1367 | ||
1368 | memcpy(&event_notifier_enabler->base.event_param.name, | |
1369 | event_notifier_param->event.name, | |
1370 | sizeof(event_notifier_enabler->base.event_param.name)); | |
1371 | event_notifier_enabler->base.event_param.instrumentation = | |
1372 | event_notifier_param->event.instrumentation; | |
1373 | event_notifier_enabler->base.event_param.loglevel = | |
1374 | event_notifier_param->event.loglevel; | |
1375 | event_notifier_enabler->base.event_param.loglevel_type = | |
1376 | event_notifier_param->event.loglevel_type; | |
1377 | ||
1378 | event_notifier_enabler->base.enabled = 0; | |
1379 | event_notifier_enabler->group = event_notifier_group; | |
1380 | ||
1381 | cds_list_add(&event_notifier_enabler->node, | |
1382 | &event_notifier_group->enablers_head); | |
1383 | ||
1384 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1385 | ||
1386 | return event_notifier_enabler; | |
1387 | } | |
1388 | ||
d871c65b | 1389 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1390 | { |
d871c65b FD |
1391 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
1392 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1393 | ||
e58095ef | 1394 | return 0; |
457a6b58 | 1395 | } |
457a6b58 | 1396 | |
d871c65b | 1397 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1398 | { |
d871c65b FD |
1399 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1400 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1401 | ||
e58095ef MD |
1402 | return 0; |
1403 | } | |
457a6b58 | 1404 | |
d871c65b | 1405 | static |
a56fd376 | 1406 | void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
ab249ecf | 1407 | struct lttng_ust_bytecode_node *bytecode) |
e58095ef MD |
1408 | { |
1409 | bytecode->enabler = enabler; | |
1410 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
d871c65b FD |
1411 | } |
1412 | ||
a56fd376 | 1413 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
ab249ecf | 1414 | struct lttng_ust_bytecode_node *bytecode) |
d871c65b | 1415 | { |
a56fd376 | 1416 | _lttng_enabler_attach_filter_bytecode( |
d871c65b FD |
1417 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
1418 | ||
1419 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
e58095ef | 1420 | return 0; |
0bfb5cbd JI |
1421 | } |
1422 | ||
d871c65b FD |
1423 | static |
1424 | void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
0bfb5cbd JI |
1425 | struct lttng_ust_excluder_node *excluder) |
1426 | { | |
1427 | excluder->enabler = enabler; | |
1428 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
d871c65b FD |
1429 | } |
1430 | ||
1431 | int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler, | |
1432 | struct lttng_ust_excluder_node *excluder) | |
1433 | { | |
1434 | _lttng_enabler_attach_exclusion( | |
1435 | lttng_event_enabler_as_enabler(event_enabler), excluder); | |
1436 | ||
1437 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
0bfb5cbd | 1438 | return 0; |
e58095ef | 1439 | } |
f488575f | 1440 | |
d8d2416d FD |
1441 | int lttng_event_notifier_enabler_enable( |
1442 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1443 | { | |
1444 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
1445 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1446 | ||
1447 | return 0; | |
1448 | } | |
1449 | ||
1450 | int lttng_event_notifier_enabler_disable( | |
1451 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1452 | { | |
1453 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
1454 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1455 | ||
1456 | return 0; | |
1457 | } | |
1458 | ||
a56fd376 | 1459 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
d8d2416d | 1460 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
ab249ecf | 1461 | struct lttng_ust_bytecode_node *bytecode) |
d8d2416d | 1462 | { |
a56fd376 | 1463 | _lttng_enabler_attach_filter_bytecode( |
d8d2416d FD |
1464 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
1465 | bytecode); | |
1466 | ||
1467 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1468 | return 0; | |
1469 | } | |
1470 | ||
1471 | int lttng_event_notifier_enabler_attach_exclusion( | |
1472 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1473 | struct lttng_ust_excluder_node *excluder) | |
1474 | { | |
1475 | _lttng_enabler_attach_exclusion( | |
1476 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), | |
1477 | excluder); | |
1478 | ||
1479 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1480 | return 0; | |
1481 | } | |
1482 | ||
e58095ef | 1483 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1484 | union ust_args *uargs, |
e58095ef MD |
1485 | struct lttng_ctx **ctx, struct lttng_session *session) |
1486 | { | |
457a6b58 | 1487 | /* |
e58095ef MD |
1488 | * We cannot attach a context after trace has been started for a |
1489 | * session because the metadata does not allow expressing this | |
1490 | * information outside of the original channel scope. | |
457a6b58 | 1491 | */ |
e58095ef MD |
1492 | if (session->been_active) |
1493 | return -EPERM; | |
457a6b58 | 1494 | |
e58095ef MD |
1495 | switch (context_param->ctx) { |
1496 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1497 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1498 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1499 | { | |
1500 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1501 | ||
1502 | perf_ctx_param = &context_param->u.perf_counter; | |
1503 | return lttng_add_perf_counter_to_ctx( | |
1504 | perf_ctx_param->type, | |
1505 | perf_ctx_param->config, | |
1506 | perf_ctx_param->name, | |
1507 | ctx); | |
1508 | } | |
e58095ef MD |
1509 | case LTTNG_UST_CONTEXT_VTID: |
1510 | return lttng_add_vtid_to_ctx(ctx); | |
1511 | case LTTNG_UST_CONTEXT_VPID: | |
1512 | return lttng_add_vpid_to_ctx(ctx); | |
1513 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1514 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1515 | case LTTNG_UST_CONTEXT_IP: |
1516 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1517 | case LTTNG_UST_CONTEXT_CPU_ID: |
1518 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1519 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1520 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1521 | ctx); | |
735bef47 MJ |
1522 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1523 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1524 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1525 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1526 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1527 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1528 | case LTTNG_UST_CONTEXT_NET_NS: | |
1529 | return lttng_add_net_ns_to_ctx(ctx); | |
1530 | case LTTNG_UST_CONTEXT_PID_NS: | |
1531 | return lttng_add_pid_ns_to_ctx(ctx); | |
cefef7a7 MJ |
1532 | case LTTNG_UST_CONTEXT_TIME_NS: |
1533 | return lttng_add_time_ns_to_ctx(ctx); | |
735bef47 MJ |
1534 | case LTTNG_UST_CONTEXT_USER_NS: |
1535 | return lttng_add_user_ns_to_ctx(ctx); | |
1536 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1537 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1538 | case LTTNG_UST_CONTEXT_VUID: |
1539 | return lttng_add_vuid_to_ctx(ctx); | |
1540 | case LTTNG_UST_CONTEXT_VEUID: | |
1541 | return lttng_add_veuid_to_ctx(ctx); | |
1542 | case LTTNG_UST_CONTEXT_VSUID: | |
1543 | return lttng_add_vsuid_to_ctx(ctx); | |
1544 | case LTTNG_UST_CONTEXT_VGID: | |
1545 | return lttng_add_vgid_to_ctx(ctx); | |
1546 | case LTTNG_UST_CONTEXT_VEGID: | |
1547 | return lttng_add_vegid_to_ctx(ctx); | |
1548 | case LTTNG_UST_CONTEXT_VSGID: | |
1549 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1550 | default: |
1551 | return -EINVAL; | |
457a6b58 | 1552 | } |
457a6b58 MD |
1553 | } |
1554 | ||
d871c65b | 1555 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
e58095ef | 1556 | struct lttng_ust_context *context_param) |
457a6b58 | 1557 | { |
e58095ef | 1558 | return -ENOSYS; |
457a6b58 MD |
1559 | } |
1560 | ||
d871c65b | 1561 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1562 | { |
d871c65b FD |
1563 | if (!event_enabler) { |
1564 | return; | |
0f63324a | 1565 | } |
d871c65b | 1566 | cds_list_del(&event_enabler->node); |
0f63324a | 1567 | |
d871c65b | 1568 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef | 1569 | |
d871c65b FD |
1570 | lttng_destroy_context(event_enabler->ctx); |
1571 | free(event_enabler); | |
457a6b58 MD |
1572 | } |
1573 | ||
e58095ef | 1574 | /* |
d871c65b | 1575 | * lttng_session_sync_event_enablers should be called just before starting a |
e58095ef MD |
1576 | * session. |
1577 | */ | |
457a6b58 | 1578 | static |
d871c65b | 1579 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1580 | { |
d871c65b | 1581 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1582 | struct lttng_event *event; |
457a6b58 | 1583 | |
d871c65b FD |
1584 | cds_list_for_each_entry(event_enabler, &session->enablers_head, node) |
1585 | lttng_event_enabler_ref_events(event_enabler); | |
e58095ef MD |
1586 | /* |
1587 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1588 | * and its channel and session transient states are enabled, we |
1589 | * enable the event, else we disable it. | |
e58095ef MD |
1590 | */ |
1591 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1592 | struct lttng_enabler_ref *enabler_ref; | |
1593 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1594 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1595 | |
1596 | /* Enable events */ | |
1597 | cds_list_for_each_entry(enabler_ref, | |
1598 | &event->enablers_ref_head, node) { | |
1599 | if (enabler_ref->ref->enabled) { | |
1600 | enabled = 1; | |
1601 | break; | |
1602 | } | |
1603 | } | |
ac6b4ac6 MD |
1604 | /* |
1605 | * Enabled state is based on union of enablers, with | |
1606 | * intesection of session and channel transient enable | |
1607 | * states. | |
1608 | */ | |
1609 | enabled = enabled && session->tstate && event->chan->tstate; | |
1610 | ||
1611 | CMM_STORE_SHARED(event->enabled, enabled); | |
1612 | /* | |
1613 | * Sync tracepoint registration with event enabled | |
1614 | * state. | |
1615 | */ | |
1616 | if (enabled) { | |
1617 | if (!event->registered) | |
1618 | register_event(event); | |
1619 | } else { | |
1620 | if (event->registered) | |
1621 | unregister_event(event); | |
1622 | } | |
457a6b58 | 1623 | |
1f49fc05 | 1624 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1625 | cds_list_for_each_entry(enabler_ref, |
1626 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1627 | if (enabler_ref->ref->enabled |
1628 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1629 | has_enablers_without_bytecode = 1; |
1630 | break; | |
1631 | } | |
1632 | } | |
1633 | event->has_enablers_without_bytecode = | |
1634 | has_enablers_without_bytecode; | |
1635 | ||
e58095ef MD |
1636 | /* Enable filters */ |
1637 | cds_list_for_each_entry(runtime, | |
a56fd376 | 1638 | &event->filter_bytecode_runtime_head, node) { |
4d451c15 | 1639 | lttng_bytecode_filter_sync_state(runtime); |
457a6b58 MD |
1640 | } |
1641 | } | |
baa1e0bc | 1642 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1643 | } |
1644 | ||
d8d2416d FD |
1645 | static |
1646 | void lttng_create_event_notifier_if_missing( | |
1647 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1648 | { | |
1649 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1650 | struct lttng_probe_desc *probe_desc; | |
1651 | struct cds_list_head *probe_list; | |
1652 | int i; | |
1653 | ||
1654 | probe_list = lttng_get_probe_list_head(); | |
1655 | ||
1656 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1657 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1658 | int ret; | |
1659 | bool found = false; | |
1660 | const struct lttng_event_desc *desc; | |
1661 | struct lttng_event_notifier *event_notifier; | |
1662 | struct cds_hlist_head *head; | |
1663 | struct cds_hlist_node *node; | |
1664 | ||
1665 | desc = probe_desc->event_desc[i]; | |
1666 | if (!lttng_desc_match_enabler(desc, | |
1667 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1668 | continue; | |
1669 | ||
1670 | /* | |
1671 | * Given the current event_notifier group, get the bucket that | |
1672 | * the target event_notifier would be if it was already | |
1673 | * created. | |
1674 | */ | |
1675 | head = borrow_hash_table_bucket( | |
1676 | event_notifier_group->event_notifiers_ht.table, | |
1677 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
1678 | ||
1679 | cds_hlist_for_each_entry(event_notifier, node, head, hlist) { | |
1680 | /* | |
1681 | * Check if event_notifier already exists by checking | |
1682 | * if the event_notifier and enabler share the same | |
1683 | * description and id. | |
1684 | */ | |
1685 | if (event_notifier->desc == desc && | |
1686 | event_notifier->user_token == event_notifier_enabler->user_token) { | |
1687 | found = true; | |
1688 | break; | |
1689 | } | |
1690 | } | |
1691 | ||
1692 | if (found) | |
1693 | continue; | |
1694 | ||
1695 | /* | |
1696 | * We need to create a event_notifier for this event probe. | |
1697 | */ | |
1698 | ret = lttng_event_notifier_create(desc, | |
1699 | event_notifier_enabler->user_token, | |
1700 | event_notifier_group); | |
1701 | if (ret) { | |
1702 | DBG("Unable to create event_notifier %s, error %d\n", | |
1703 | probe_desc->event_desc[i]->name, ret); | |
1704 | } | |
1705 | } | |
1706 | } | |
1707 | } | |
1708 | ||
1709 | /* | |
1710 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
1711 | */ | |
1712 | static | |
1713 | int lttng_event_notifier_enabler_ref_event_notifiers( | |
1714 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1715 | { | |
1716 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1717 | struct lttng_event_notifier *event_notifier; | |
1718 | ||
1719 | /* | |
1720 | * Only try to create event_notifiers for enablers that are enabled, the user | |
1721 | * might still be attaching filter or exclusion to the | |
1722 | * event_notifier_enabler. | |
1723 | */ | |
1724 | if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled) | |
1725 | goto end; | |
1726 | ||
1727 | /* First, ensure that probe event_notifiers are created for this enabler. */ | |
1728 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
1729 | ||
1730 | /* Link the created event_notifier with its associated enabler. */ | |
1731 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1732 | struct lttng_enabler_ref *enabler_ref; | |
1733 | ||
1734 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
1735 | continue; | |
1736 | ||
1737 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
1738 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1739 | if (!enabler_ref) { | |
1740 | /* | |
1741 | * If no backward ref, create it. | |
1742 | * Add backward ref from event_notifier to enabler. | |
1743 | */ | |
1744 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1745 | if (!enabler_ref) | |
1746 | return -ENOMEM; | |
1747 | ||
1748 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
1749 | event_notifier_enabler); | |
1750 | cds_list_add(&enabler_ref->node, | |
1751 | &event_notifier->enablers_ref_head); | |
1752 | } | |
1753 | ||
1754 | /* | |
1755 | * Link filter bytecodes if not linked yet. | |
1756 | */ | |
1757 | lttng_enabler_link_bytecode(event_notifier->desc, | |
621c07fc FD |
1758 | &event_notifier_group->ctx, |
1759 | &event_notifier->filter_bytecode_runtime_head, | |
1760 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); | |
d8d2416d FD |
1761 | } |
1762 | end: | |
1763 | return 0; | |
1764 | } | |
1765 | ||
1766 | static | |
1767 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
1768 | { | |
1769 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1770 | struct lttng_event_notifier *event_notifier; | |
1771 | ||
1772 | cds_list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
1773 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
1774 | ||
1775 | /* | |
1776 | * For each event_notifier, if at least one of its enablers is enabled, | |
1777 | * we enable the event_notifier, else we disable it. | |
1778 | */ | |
1779 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1780 | struct lttng_enabler_ref *enabler_ref; | |
1781 | struct lttng_bytecode_runtime *runtime; | |
1782 | int enabled = 0, has_enablers_without_bytecode = 0; | |
1783 | ||
1784 | /* Enable event_notifiers */ | |
1785 | cds_list_for_each_entry(enabler_ref, | |
1786 | &event_notifier->enablers_ref_head, node) { | |
1787 | if (enabler_ref->ref->enabled) { | |
1788 | enabled = 1; | |
1789 | break; | |
1790 | } | |
1791 | } | |
1792 | ||
1793 | CMM_STORE_SHARED(event_notifier->enabled, enabled); | |
1794 | /* | |
1795 | * Sync tracepoint registration with event_notifier enabled | |
1796 | * state. | |
1797 | */ | |
1798 | if (enabled) { | |
1799 | if (!event_notifier->registered) | |
1800 | register_event_notifier(event_notifier); | |
1801 | } else { | |
1802 | if (event_notifier->registered) | |
1803 | unregister_event_notifier(event_notifier); | |
1804 | } | |
1805 | ||
1806 | /* Check if has enablers without bytecode enabled */ | |
1807 | cds_list_for_each_entry(enabler_ref, | |
1808 | &event_notifier->enablers_ref_head, node) { | |
1809 | if (enabler_ref->ref->enabled | |
1810 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1811 | has_enablers_without_bytecode = 1; | |
1812 | break; | |
1813 | } | |
1814 | } | |
1815 | event_notifier->has_enablers_without_bytecode = | |
1816 | has_enablers_without_bytecode; | |
1817 | ||
1818 | /* Enable filters */ | |
1819 | cds_list_for_each_entry(runtime, | |
1820 | &event_notifier->filter_bytecode_runtime_head, node) { | |
4d451c15 | 1821 | lttng_bytecode_filter_sync_state(runtime); |
d8d2416d FD |
1822 | } |
1823 | } | |
1824 | __tracepoint_probe_prune_release_queue(); | |
1825 | } | |
1826 | ||
e58095ef MD |
1827 | /* |
1828 | * Apply enablers to session events, adding events to session if need | |
1829 | * be. It is required after each modification applied to an active | |
1830 | * session, and right before session "start". | |
1831 | * "lazy" sync means we only sync if required. | |
1832 | */ | |
1833 | static | |
d871c65b | 1834 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1835 | { |
e58095ef MD |
1836 | /* We can skip if session is not active */ |
1837 | if (!session->active) | |
1838 | return; | |
d871c65b | 1839 | lttng_session_sync_event_enablers(session); |
457a6b58 | 1840 | } |
53569322 MD |
1841 | |
1842 | /* | |
1843 | * Update all sessions with the given app context. | |
1844 | * Called with ust lock held. | |
1845 | * This is invoked when an application context gets loaded/unloaded. It | |
1846 | * ensures the context callbacks are in sync with the application | |
1847 | * context (either app context callbacks, or dummy callbacks). | |
1848 | */ | |
1849 | void lttng_ust_context_set_session_provider(const char *name, | |
1850 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1851 | void (*record)(struct lttng_ctx_field *field, | |
1852 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1853 | struct lttng_channel *chan), | |
1854 | void (*get_value)(struct lttng_ctx_field *field, | |
1855 | struct lttng_ctx_value *value)) | |
1856 | { | |
1857 | struct lttng_session *session; | |
1858 | ||
1859 | cds_list_for_each_entry(session, &sessions, node) { | |
1860 | struct lttng_channel *chan; | |
1861 | struct lttng_event *event; | |
1862 | int ret; | |
1863 | ||
1864 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1865 | name, get_size, record, get_value); | |
1866 | if (ret) | |
1867 | abort(); | |
1868 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1869 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1870 | name, get_size, record, get_value); | |
1871 | if (ret) | |
1872 | abort(); | |
1873 | } | |
1874 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1875 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1876 | name, get_size, record, get_value); | |
1877 | if (ret) | |
1878 | abort(); | |
1879 | } | |
1880 | } | |
1881 | } | |
d8d2416d FD |
1882 | |
1883 | /* | |
1884 | * Update all event_notifier groups with the given app context. | |
1885 | * Called with ust lock held. | |
1886 | * This is invoked when an application context gets loaded/unloaded. It | |
1887 | * ensures the context callbacks are in sync with the application | |
1888 | * context (either app context callbacks, or dummy callbacks). | |
1889 | */ | |
1890 | void lttng_ust_context_set_event_notifier_group_provider(const char *name, | |
1891 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1892 | void (*record)(struct lttng_ctx_field *field, | |
1893 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1894 | struct lttng_channel *chan), | |
1895 | void (*get_value)(struct lttng_ctx_field *field, | |
1896 | struct lttng_ctx_value *value)) | |
1897 | { | |
1898 | struct lttng_event_notifier_group *event_notifier_group; | |
1899 | ||
1900 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1901 | int ret; | |
1902 | ||
1903 | ret = lttng_ust_context_set_provider_rcu( | |
1904 | &event_notifier_group->ctx, | |
1905 | name, get_size, record, get_value); | |
1906 | if (ret) | |
1907 | abort(); | |
1908 | } | |
1909 | } |