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" |
51f804ec | 66 | #include "context-internal.h" |
d871c65b | 67 | #include "ust-events-internal.h" |
b728d87e | 68 | #include "wait.h" |
8d8a24c8 | 69 | #include "../libringbuffer/shm.h" |
596c4223 | 70 | #include "jhash.h" |
d8d2416d | 71 | #include <lttng/ust-abi.h> |
8165c8da MD |
72 | |
73 | /* | |
3327ac33 MD |
74 | * All operations within this file are called by the communication |
75 | * thread, under ust_lock protection. | |
8165c8da | 76 | */ |
8165c8da | 77 | |
b5234c06 | 78 | static CDS_LIST_HEAD(sessions); |
d8d2416d | 79 | static CDS_LIST_HEAD(event_notifier_groups); |
8165c8da | 80 | |
37dddb65 MD |
81 | struct cds_list_head *_lttng_get_sessions(void) |
82 | { | |
83 | return &sessions; | |
84 | } | |
85 | ||
7dd08bec | 86 | static void _lttng_event_destroy(struct lttng_event *event); |
d8d2416d FD |
87 | static void _lttng_event_notifier_destroy( |
88 | struct lttng_event_notifier *event_notifier); | |
c785c634 | 89 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 90 | |
e58095ef | 91 | static |
d871c65b | 92 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
e58095ef | 93 | static |
d871c65b | 94 | void lttng_session_sync_event_enablers(struct lttng_session *session); |
e58095ef | 95 | static |
d8d2416d FD |
96 | void lttng_event_notifier_group_sync_enablers( |
97 | struct lttng_event_notifier_group *event_notifier_group); | |
98 | static | |
e58095ef MD |
99 | void lttng_enabler_destroy(struct lttng_enabler *enabler); |
100 | ||
6715d7d1 MD |
101 | /* |
102 | * Called with ust lock held. | |
103 | */ | |
104 | int lttng_session_active(void) | |
105 | { | |
106 | struct lttng_session *iter; | |
107 | ||
108 | cds_list_for_each_entry(iter, &sessions, node) { | |
109 | if (iter->active) | |
110 | return 1; | |
111 | } | |
112 | return 0; | |
113 | } | |
114 | ||
e58095ef MD |
115 | static |
116 | int lttng_loglevel_match(int loglevel, | |
117 | unsigned int has_loglevel, | |
457a6b58 MD |
118 | enum lttng_ust_loglevel_type req_type, |
119 | int req_loglevel) | |
120 | { | |
e58095ef MD |
121 | if (!has_loglevel) |
122 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
123 | switch (req_type) { |
124 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 125 | if (loglevel <= req_loglevel |
67ada458 | 126 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
127 | return 1; |
128 | else | |
129 | return 0; | |
130 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 131 | if (loglevel == req_loglevel |
67ada458 | 132 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
133 | return 1; |
134 | else | |
135 | return 0; | |
136 | case LTTNG_UST_LOGLEVEL_ALL: | |
137 | default: | |
67ada458 | 138 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
139 | return 1; |
140 | else | |
141 | return 0; | |
457a6b58 MD |
142 | } |
143 | } | |
144 | ||
8020ceb5 MD |
145 | void synchronize_trace(void) |
146 | { | |
8020ceb5 | 147 | synchronize_rcu(); |
8020ceb5 MD |
148 | } |
149 | ||
7dd08bec | 150 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 151 | { |
7dd08bec | 152 | struct lttng_session *session; |
74d81a6c | 153 | int i; |
8020ceb5 | 154 | |
7dd08bec | 155 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
156 | if (!session) |
157 | return NULL; | |
51f804ec | 158 | if (lttng_context_init_all(&session->ctx)) { |
53569322 MD |
159 | free(session); |
160 | return NULL; | |
161 | } | |
e58095ef MD |
162 | CDS_INIT_LIST_HEAD(&session->chan_head); |
163 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 164 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 165 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
166 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
167 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
168 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
169 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 170 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
171 | return session; |
172 | } | |
173 | ||
d8d2416d FD |
174 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
175 | { | |
176 | struct lttng_event_notifier_group *event_notifier_group; | |
177 | int i; | |
178 | ||
179 | event_notifier_group = zmalloc(sizeof(struct lttng_event_notifier_group)); | |
180 | if (!event_notifier_group) | |
181 | return NULL; | |
182 | ||
51f804ec FD |
183 | /* Add all contexts. */ |
184 | if (lttng_context_init_all(&event_notifier_group->ctx)) { | |
185 | free(event_notifier_group); | |
186 | return NULL; | |
187 | } | |
188 | ||
d8d2416d FD |
189 | CDS_INIT_LIST_HEAD(&event_notifier_group->enablers_head); |
190 | CDS_INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
191 | for (i = 0; i < LTTNG_UST_EVENT_NOTIFIER_HT_SIZE; i++) | |
192 | CDS_INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
193 | ||
194 | cds_list_add(&event_notifier_group->node, &event_notifier_groups); | |
195 | ||
196 | return event_notifier_group; | |
197 | } | |
198 | ||
74d81a6c MD |
199 | /* |
200 | * Only used internally at session destruction. | |
201 | */ | |
202 | static | |
203 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
204 | { | |
205 | struct channel *chan; | |
206 | struct lttng_ust_shm_handle *handle; | |
207 | ||
208 | cds_list_del(<tng_chan->node); | |
209 | lttng_destroy_context(lttng_chan->ctx); | |
210 | chan = lttng_chan->chan; | |
211 | handle = lttng_chan->handle; | |
212 | /* | |
213 | * note: lttng_chan is private data contained within handle. It | |
214 | * will be freed along with the handle. | |
215 | */ | |
216 | channel_destroy(chan, handle, 0); | |
217 | } | |
218 | ||
ac6b4ac6 MD |
219 | static |
220 | void register_event(struct lttng_event *event) | |
221 | { | |
222 | int ret; | |
223 | const struct lttng_event_desc *desc; | |
224 | ||
225 | assert(event->registered == 0); | |
226 | desc = event->desc; | |
baa1e0bc | 227 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
228 | desc->probe_callback, |
229 | event, desc->signature); | |
230 | WARN_ON_ONCE(ret); | |
231 | if (!ret) | |
232 | event->registered = 1; | |
233 | } | |
234 | ||
d8d2416d FD |
235 | static |
236 | void register_event_notifier(struct lttng_event_notifier *event_notifier) | |
237 | { | |
238 | int ret; | |
239 | const struct lttng_event_desc *desc; | |
240 | ||
241 | assert(event_notifier->registered == 0); | |
242 | desc = event_notifier->desc; | |
243 | ret = __tracepoint_probe_register_queue_release(desc->name, | |
244 | desc->u.ext.event_notifier_callback, event_notifier, desc->signature); | |
245 | WARN_ON_ONCE(ret); | |
246 | if (!ret) | |
247 | event_notifier->registered = 1; | |
248 | } | |
249 | ||
ac6b4ac6 MD |
250 | static |
251 | void unregister_event(struct lttng_event *event) | |
252 | { | |
253 | int ret; | |
254 | const struct lttng_event_desc *desc; | |
255 | ||
256 | assert(event->registered == 1); | |
257 | desc = event->desc; | |
baa1e0bc | 258 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
259 | desc->probe_callback, |
260 | event); | |
261 | WARN_ON_ONCE(ret); | |
262 | if (!ret) | |
263 | event->registered = 0; | |
264 | } | |
265 | ||
d8d2416d FD |
266 | static |
267 | void unregister_event_notifier(struct lttng_event_notifier *event_notifier) | |
268 | { | |
269 | int ret; | |
270 | const struct lttng_event_desc *desc; | |
271 | ||
272 | assert(event_notifier->registered == 1); | |
273 | desc = event_notifier->desc; | |
274 | ret = __tracepoint_probe_unregister_queue_release(desc->name, | |
275 | desc->u.ext.event_notifier_callback, event_notifier); | |
276 | WARN_ON_ONCE(ret); | |
277 | if (!ret) | |
278 | event_notifier->registered = 0; | |
279 | } | |
280 | ||
ac6b4ac6 MD |
281 | /* |
282 | * Only used internally at session destruction. | |
283 | */ | |
284 | static | |
285 | void _lttng_event_unregister(struct lttng_event *event) | |
286 | { | |
287 | if (event->registered) | |
288 | unregister_event(event); | |
289 | } | |
290 | ||
d8d2416d FD |
291 | /* |
292 | * Only used internally at session destruction. | |
293 | */ | |
294 | static | |
295 | void _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier) | |
296 | { | |
297 | if (event_notifier->registered) | |
298 | unregister_event_notifier(event_notifier); | |
299 | } | |
300 | ||
7dd08bec | 301 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 302 | { |
7dd08bec MD |
303 | struct lttng_channel *chan, *tmpchan; |
304 | struct lttng_event *event, *tmpevent; | |
c785c634 | 305 | struct lttng_enum *_enum, *tmp_enum; |
d871c65b | 306 | struct lttng_event_enabler *event_enabler, *event_tmpenabler; |
8020ceb5 | 307 | |
b5234c06 | 308 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 309 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 310 | _lttng_event_unregister(event); |
8020ceb5 MD |
311 | } |
312 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
baa1e0bc | 313 | __tracepoint_probe_prune_release_queue(); |
d871c65b | 314 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
e58095ef | 315 | &session->enablers_head, node) |
d871c65b | 316 | lttng_event_enabler_destroy(event_enabler); |
e58095ef MD |
317 | cds_list_for_each_entry_safe(event, tmpevent, |
318 | &session->events_head, node) | |
7dd08bec | 319 | _lttng_event_destroy(event); |
c785c634 MD |
320 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
321 | &session->enums_head, node) | |
322 | _lttng_enum_destroy(_enum); | |
e58095ef | 323 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 324 | _lttng_channel_unmap(chan); |
e58095ef | 325 | cds_list_del(&session->node); |
53569322 | 326 | lttng_destroy_context(session->ctx); |
b5234c06 | 327 | free(session); |
8020ceb5 MD |
328 | } |
329 | ||
d8d2416d FD |
330 | void lttng_event_notifier_group_destroy( |
331 | struct lttng_event_notifier_group *event_notifier_group) | |
332 | { | |
333 | int close_ret; | |
334 | struct lttng_event_notifier_enabler *notifier_enabler, *tmpnotifier_enabler; | |
335 | struct lttng_event_notifier *notifier, *tmpnotifier; | |
336 | ||
337 | if (!event_notifier_group) { | |
338 | return; | |
339 | } | |
340 | ||
341 | cds_list_for_each_entry(notifier, | |
342 | &event_notifier_group->event_notifiers_head, node) | |
343 | _lttng_event_notifier_unregister(notifier); | |
344 | ||
345 | synchronize_trace(); | |
346 | ||
347 | cds_list_for_each_entry_safe(notifier_enabler, tmpnotifier_enabler, | |
348 | &event_notifier_group->enablers_head, node) | |
349 | lttng_event_notifier_enabler_destroy(notifier_enabler); | |
350 | ||
351 | cds_list_for_each_entry_safe(notifier, tmpnotifier, | |
352 | &event_notifier_group->event_notifiers_head, node) | |
353 | _lttng_event_notifier_destroy(notifier); | |
354 | ||
355 | /* Close the notification fd to the listener of event notifiers. */ | |
356 | ||
357 | lttng_ust_lock_fd_tracker(); | |
358 | close_ret = close(event_notifier_group->notification_fd); | |
359 | if (!close_ret) { | |
360 | lttng_ust_delete_fd_from_tracker( | |
361 | event_notifier_group->notification_fd); | |
362 | } else { | |
363 | PERROR("close"); | |
364 | abort(); | |
365 | } | |
366 | lttng_ust_unlock_fd_tracker(); | |
367 | ||
368 | cds_list_del(&event_notifier_group->node); | |
369 | ||
370 | free(event_notifier_group); | |
371 | } | |
372 | ||
d871c65b FD |
373 | static |
374 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
375 | { | |
ab249ecf | 376 | struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node; |
d871c65b FD |
377 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
378 | ||
379 | if (!enabler) { | |
380 | return; | |
381 | } | |
382 | ||
383 | /* Destroy filter bytecode */ | |
384 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
385 | &enabler->filter_bytecode_head, node) { | |
386 | free(filter_node); | |
387 | } | |
388 | ||
389 | /* Destroy excluders */ | |
390 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
391 | &enabler->excluder_head, node) { | |
392 | free(excluder_node); | |
393 | } | |
394 | } | |
395 | ||
d8d2416d FD |
396 | void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler) |
397 | { | |
398 | if (!event_notifier_enabler) { | |
399 | return; | |
400 | } | |
401 | ||
402 | cds_list_del(&event_notifier_enabler->node); | |
403 | ||
404 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
405 | ||
406 | free(event_notifier_enabler); | |
407 | } | |
408 | ||
53569322 MD |
409 | static |
410 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
411 | struct lttng_session *session) | |
412 | { | |
413 | const char *enum_name = desc->name; | |
414 | struct lttng_enum *_enum; | |
415 | struct cds_hlist_head *head; | |
53569322 MD |
416 | int ret = 0; |
417 | size_t name_len = strlen(enum_name); | |
418 | uint32_t hash; | |
419 | int notify_socket; | |
420 | ||
b33b46f7 | 421 | /* Check if this enum is already registered for this session. */ |
53569322 MD |
422 | hash = jhash(enum_name, name_len, 0); |
423 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
b33b46f7 FD |
424 | |
425 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
426 | if (_enum) { | |
427 | ret = -EEXIST; | |
428 | goto exist; | |
53569322 MD |
429 | } |
430 | ||
431 | notify_socket = lttng_get_notify_socket(session->owner); | |
432 | if (notify_socket < 0) { | |
433 | ret = notify_socket; | |
434 | goto socket_error; | |
435 | } | |
436 | ||
437 | _enum = zmalloc(sizeof(*_enum)); | |
438 | if (!_enum) { | |
439 | ret = -ENOMEM; | |
440 | goto cache_error; | |
441 | } | |
442 | _enum->session = session; | |
443 | _enum->desc = desc; | |
444 | ||
445 | ret = ustcomm_register_enum(notify_socket, | |
446 | session->objd, | |
447 | enum_name, | |
448 | desc->nr_entries, | |
449 | desc->entries, | |
450 | &_enum->id); | |
451 | if (ret < 0) { | |
452 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
453 | goto sessiond_register_error; | |
454 | } | |
455 | cds_list_add(&_enum->node, &session->enums_head); | |
456 | cds_hlist_add_head(&_enum->hlist, head); | |
457 | return 0; | |
458 | ||
459 | sessiond_register_error: | |
460 | free(_enum); | |
461 | cache_error: | |
462 | socket_error: | |
463 | exist: | |
464 | return ret; | |
465 | } | |
466 | ||
467 | static | |
468 | int lttng_create_enum_check(const struct lttng_type *type, | |
469 | struct lttng_session *session) | |
470 | { | |
471 | switch (type->atype) { | |
472 | case atype_enum: | |
473 | { | |
474 | const struct lttng_enum_desc *enum_desc; | |
475 | int ret; | |
476 | ||
218deb69 MD |
477 | enum_desc = type->u.legacy.basic.enumeration.desc; |
478 | ret = lttng_enum_create(enum_desc, session); | |
479 | if (ret && ret != -EEXIST) { | |
480 | DBG("Unable to create enum error: (%d)", ret); | |
481 | return ret; | |
482 | } | |
483 | break; | |
484 | } | |
485 | case atype_enum_nestable: | |
486 | { | |
487 | const struct lttng_enum_desc *enum_desc; | |
488 | int ret; | |
489 | ||
490 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
491 | ret = lttng_enum_create(enum_desc, session); |
492 | if (ret && ret != -EEXIST) { | |
493 | DBG("Unable to create enum error: (%d)", ret); | |
494 | return ret; | |
495 | } | |
496 | break; | |
497 | } | |
498 | case atype_dynamic: | |
499 | { | |
500 | const struct lttng_event_field *tag_field_generic; | |
501 | const struct lttng_enum_desc *enum_desc; | |
502 | int ret; | |
503 | ||
504 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 505 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
506 | ret = lttng_enum_create(enum_desc, session); |
507 | if (ret && ret != -EEXIST) { | |
508 | DBG("Unable to create enum error: (%d)", ret); | |
509 | return ret; | |
510 | } | |
511 | break; | |
512 | } | |
513 | default: | |
514 | /* TODO: nested types when they become supported. */ | |
515 | break; | |
516 | } | |
517 | return 0; | |
518 | } | |
519 | ||
520 | static | |
521 | int lttng_create_all_event_enums(size_t nr_fields, | |
522 | const struct lttng_event_field *event_fields, | |
523 | struct lttng_session *session) | |
524 | { | |
525 | size_t i; | |
526 | int ret; | |
527 | ||
528 | /* For each field, ensure enum is part of the session. */ | |
529 | for (i = 0; i < nr_fields; i++) { | |
530 | const struct lttng_type *type = &event_fields[i].type; | |
531 | ||
532 | ret = lttng_create_enum_check(type, session); | |
533 | if (ret) | |
534 | return ret; | |
535 | } | |
536 | return 0; | |
537 | } | |
538 | ||
539 | static | |
540 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
541 | const struct lttng_ctx_field *ctx_fields, | |
542 | struct lttng_session *session) | |
543 | { | |
544 | size_t i; | |
545 | int ret; | |
546 | ||
547 | /* For each field, ensure enum is part of the session. */ | |
548 | for (i = 0; i < nr_fields; i++) { | |
549 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
550 | ||
551 | ret = lttng_create_enum_check(type, session); | |
552 | if (ret) | |
553 | return ret; | |
554 | } | |
555 | return 0; | |
556 | } | |
557 | ||
710b8ee3 MD |
558 | /* |
559 | * Ensure that a state-dump will be performed for this session at the end | |
560 | * of the current handle_message(). | |
561 | */ | |
562 | int lttng_session_statedump(struct lttng_session *session) | |
563 | { | |
564 | session->statedump_pending = 1; | |
565 | lttng_ust_sockinfo_session_enabled(session->owner); | |
566 | return 0; | |
567 | } | |
53569322 | 568 | |
7dd08bec | 569 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
570 | { |
571 | int ret = 0; | |
7dd08bec | 572 | struct lttng_channel *chan; |
32ce8569 | 573 | int notify_socket; |
8020ceb5 | 574 | |
8020ceb5 MD |
575 | if (session->active) { |
576 | ret = -EBUSY; | |
577 | goto end; | |
578 | } | |
579 | ||
32ce8569 MD |
580 | notify_socket = lttng_get_notify_socket(session->owner); |
581 | if (notify_socket < 0) | |
582 | return notify_socket; | |
583 | ||
ac6b4ac6 MD |
584 | /* Set transient enabler state to "enabled" */ |
585 | session->tstate = 1; | |
e58095ef | 586 | |
3ff7660f | 587 | /* We need to sync enablers with session before activation. */ |
d871c65b | 588 | lttng_session_sync_event_enablers(session); |
3ff7660f | 589 | |
8020ceb5 MD |
590 | /* |
591 | * Snapshot the number of events per channel to know the type of header | |
592 | * we need to use. | |
593 | */ | |
e58095ef | 594 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 595 | const struct lttng_ctx *ctx; |
83e43212 | 596 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 597 | size_t nr_fields = 0; |
6ca18e66 | 598 | uint32_t chan_id; |
32ce8569 MD |
599 | |
600 | /* don't change it if session stop/restart */ | |
8020ceb5 | 601 | if (chan->header_type) |
32ce8569 MD |
602 | continue; |
603 | ctx = chan->ctx; | |
604 | if (ctx) { | |
605 | nr_fields = ctx->nr_fields; | |
83e43212 | 606 | fields = ctx->fields; |
53569322 MD |
607 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
608 | session); | |
609 | if (ret < 0) { | |
610 | DBG("Error (%d) adding enum to session", ret); | |
611 | return ret; | |
612 | } | |
32ce8569 MD |
613 | } |
614 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 615 | session, |
32ce8569 MD |
616 | session->objd, |
617 | chan->objd, | |
618 | nr_fields, | |
619 | fields, | |
6ca18e66 | 620 | &chan_id, |
32ce8569 | 621 | &chan->header_type); |
b869b5ae MD |
622 | if (ret) { |
623 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 624 | return ret; |
b869b5ae | 625 | } |
6ca18e66 MD |
626 | if (chan_id != chan->id) { |
627 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
628 | chan_id, chan->id); | |
629 | return -EINVAL; | |
630 | } | |
8020ceb5 MD |
631 | } |
632 | ||
ac6b4ac6 | 633 | /* Set atomically the state to "active" */ |
b5234c06 MD |
634 | CMM_ACCESS_ONCE(session->active) = 1; |
635 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 636 | |
710b8ee3 MD |
637 | ret = lttng_session_statedump(session); |
638 | if (ret) | |
639 | return ret; | |
8020ceb5 | 640 | end: |
8020ceb5 MD |
641 | return ret; |
642 | } | |
643 | ||
7dd08bec | 644 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
645 | { |
646 | int ret = 0; | |
647 | ||
8020ceb5 MD |
648 | if (!session->active) { |
649 | ret = -EBUSY; | |
650 | goto end; | |
651 | } | |
ac6b4ac6 | 652 | /* Set atomically the state to "inactive" */ |
b5234c06 | 653 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
654 | |
655 | /* Set transient enabler state to "disabled" */ | |
656 | session->tstate = 0; | |
d871c65b | 657 | lttng_session_sync_event_enablers(session); |
8020ceb5 | 658 | end: |
8020ceb5 MD |
659 | return ret; |
660 | } | |
661 | ||
7dd08bec | 662 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 663 | { |
ac6b4ac6 | 664 | int ret = 0; |
976fe9ea | 665 | |
ac6b4ac6 MD |
666 | if (channel->enabled) { |
667 | ret = -EBUSY; | |
668 | goto end; | |
669 | } | |
670 | /* Set transient enabler state to "enabled" */ | |
671 | channel->tstate = 1; | |
d871c65b | 672 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
673 | /* Set atomically the state to "enabled" */ |
674 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
675 | end: | |
676 | return ret; | |
976fe9ea MD |
677 | } |
678 | ||
7dd08bec | 679 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 680 | { |
ac6b4ac6 | 681 | int ret = 0; |
976fe9ea | 682 | |
ac6b4ac6 MD |
683 | if (!channel->enabled) { |
684 | ret = -EBUSY; | |
685 | goto end; | |
686 | } | |
687 | /* Set atomically the state to "disabled" */ | |
688 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
689 | /* Set transient enabler state to "enabled" */ | |
690 | channel->tstate = 0; | |
d871c65b | 691 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
692 | end: |
693 | return ret; | |
976fe9ea MD |
694 | } |
695 | ||
fb470188 FD |
696 | static inline |
697 | struct cds_hlist_head *borrow_hash_table_bucket( | |
698 | struct cds_hlist_head *hash_table, | |
699 | unsigned int hash_table_size, | |
700 | const struct lttng_event_desc *desc) | |
701 | { | |
702 | const char *event_name; | |
703 | size_t name_len; | |
704 | uint32_t hash; | |
705 | ||
706 | event_name = desc->name; | |
707 | name_len = strlen(event_name); | |
708 | ||
709 | hash = jhash(event_name, name_len, 0); | |
710 | return &hash_table[hash & (hash_table_size - 1)]; | |
711 | } | |
712 | ||
8020ceb5 MD |
713 | /* |
714 | * Supports event creation while tracing session is active. | |
715 | */ | |
e58095ef MD |
716 | static |
717 | int lttng_event_create(const struct lttng_event_desc *desc, | |
718 | struct lttng_channel *chan) | |
8020ceb5 | 719 | { |
7dd08bec | 720 | struct lttng_event *event; |
32ce8569 | 721 | struct lttng_session *session = chan->session; |
d56fa719 | 722 | struct cds_hlist_head *head; |
576599a0 | 723 | int ret = 0; |
32ce8569 MD |
724 | int notify_socket, loglevel; |
725 | const char *uri; | |
8020ceb5 | 726 | |
fb470188 FD |
727 | head = borrow_hash_table_bucket(chan->session->events_ht.table, |
728 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
457a6b58 | 729 | |
32ce8569 MD |
730 | notify_socket = lttng_get_notify_socket(session->owner); |
731 | if (notify_socket < 0) { | |
732 | ret = notify_socket; | |
733 | goto socket_error; | |
734 | } | |
735 | ||
53569322 MD |
736 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
737 | session); | |
c785c634 MD |
738 | if (ret < 0) { |
739 | DBG("Error (%d) adding enum to session", ret); | |
740 | goto create_enum_error; | |
741 | } | |
742 | ||
457a6b58 MD |
743 | /* |
744 | * Check if loglevel match. Refuse to connect event if not. | |
745 | */ | |
7dd08bec | 746 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
747 | if (!event) { |
748 | ret = -ENOMEM; | |
8020ceb5 | 749 | goto cache_error; |
576599a0 | 750 | } |
8020ceb5 | 751 | event->chan = chan; |
e58095ef | 752 | |
ac6b4ac6 MD |
753 | /* Event will be enabled by enabler sync. */ |
754 | event->enabled = 0; | |
755 | event->registered = 0; | |
a56fd376 | 756 | CDS_INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
e58095ef MD |
757 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); |
758 | event->desc = desc; | |
32ce8569 MD |
759 | |
760 | if (desc->loglevel) | |
761 | loglevel = *(*event->desc->loglevel); | |
762 | else | |
763 | loglevel = TRACE_DEFAULT; | |
764 | if (desc->u.ext.model_emf_uri) | |
765 | uri = *(desc->u.ext.model_emf_uri); | |
766 | else | |
767 | uri = NULL; | |
768 | ||
13b21cd6 MD |
769 | /* Fetch event ID from sessiond */ |
770 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 771 | session, |
13b21cd6 MD |
772 | session->objd, |
773 | chan->objd, | |
fb470188 | 774 | desc->name, |
13b21cd6 MD |
775 | loglevel, |
776 | desc->signature, | |
777 | desc->nr_fields, | |
778 | desc->fields, | |
779 | uri, | |
780 | &event->id); | |
781 | if (ret < 0) { | |
782 | DBG("Error (%d) registering event to sessiond", ret); | |
783 | goto sessiond_register_error; | |
32ce8569 | 784 | } |
2b213b16 | 785 | |
e58095ef | 786 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 787 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 788 | return 0; |
8020ceb5 | 789 | |
32ce8569 | 790 | sessiond_register_error: |
b5234c06 | 791 | free(event); |
8020ceb5 | 792 | cache_error: |
c785c634 | 793 | create_enum_error: |
32ce8569 | 794 | socket_error: |
576599a0 | 795 | return ret; |
8020ceb5 MD |
796 | } |
797 | ||
d8d2416d FD |
798 | static |
799 | int lttng_event_notifier_create(const struct lttng_event_desc *desc, | |
800 | uint64_t token, | |
801 | struct lttng_event_notifier_group *event_notifier_group) | |
802 | { | |
803 | struct lttng_event_notifier *event_notifier; | |
804 | struct cds_hlist_head *head; | |
805 | int ret = 0; | |
806 | ||
807 | /* | |
808 | * Get the hashtable bucket the created lttng_event_notifier object | |
809 | * should be inserted. | |
810 | */ | |
811 | head = borrow_hash_table_bucket( | |
812 | event_notifier_group->event_notifiers_ht.table, | |
813 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
814 | ||
815 | event_notifier = zmalloc(sizeof(struct lttng_event_notifier)); | |
816 | if (!event_notifier) { | |
817 | ret = -ENOMEM; | |
818 | goto error; | |
819 | } | |
820 | ||
821 | event_notifier->group = event_notifier_group; | |
822 | event_notifier->user_token = token; | |
823 | ||
824 | /* Event notifier will be enabled by enabler sync. */ | |
825 | event_notifier->enabled = 0; | |
826 | event_notifier->registered = 0; | |
827 | ||
828 | CDS_INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); | |
829 | CDS_INIT_LIST_HEAD(&event_notifier->enablers_ref_head); | |
830 | event_notifier->desc = desc; | |
831 | ||
832 | cds_list_add(&event_notifier->node, | |
833 | &event_notifier_group->event_notifiers_head); | |
834 | cds_hlist_add_head(&event_notifier->hlist, head); | |
835 | ||
836 | return 0; | |
837 | ||
838 | error: | |
839 | return ret; | |
840 | } | |
841 | ||
842 | static | |
843 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
844 | { | |
845 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
846 | ||
847 | /* Remove from event_notifier list. */ | |
848 | cds_list_del(&event_notifier->node); | |
849 | /* Remove from event_notifier hash table. */ | |
850 | cds_hlist_del(&event_notifier->hlist); | |
851 | ||
852 | lttng_free_event_notifier_filter_runtime(event_notifier); | |
853 | ||
854 | /* Free event_notifier enabler refs */ | |
855 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
856 | &event_notifier->enablers_ref_head, node) | |
857 | free(enabler_ref); | |
858 | free(event_notifier); | |
859 | } | |
860 | ||
e58095ef | 861 | static |
196ec2df | 862 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
863 | struct lttng_enabler *enabler) |
864 | { | |
865 | int loglevel = 0; | |
7e2e405c | 866 | unsigned int has_loglevel = 0; |
e58095ef | 867 | |
e450e339 | 868 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f6f42e6 MD |
869 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
870 | desc->name, SIZE_MAX)) | |
e58095ef MD |
871 | return 0; |
872 | if (desc->loglevel) { | |
873 | loglevel = *(*desc->loglevel); | |
874 | has_loglevel = 1; | |
875 | } | |
876 | if (!lttng_loglevel_match(loglevel, | |
877 | has_loglevel, | |
878 | enabler->event_param.loglevel_type, | |
879 | enabler->event_param.loglevel)) | |
880 | return 0; | |
881 | return 1; | |
882 | } | |
883 | ||
884 | static | |
885 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
886 | struct lttng_enabler *enabler) | |
887 | { | |
888 | int loglevel = 0; | |
889 | unsigned int has_loglevel = 0; | |
890 | ||
e450e339 | 891 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
e58095ef MD |
892 | if (strcmp(desc->name, enabler->event_param.name)) |
893 | return 0; | |
894 | if (desc->loglevel) { | |
895 | loglevel = *(*desc->loglevel); | |
896 | has_loglevel = 1; | |
897 | } | |
898 | if (!lttng_loglevel_match(loglevel, | |
899 | has_loglevel, | |
900 | enabler->event_param.loglevel_type, | |
901 | enabler->event_param.loglevel)) | |
902 | return 0; | |
903 | return 1; | |
904 | } | |
905 | ||
906 | static | |
907 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
908 | struct lttng_enabler *enabler) | |
909 | { | |
e450e339 FD |
910 | switch (enabler->format_type) { |
911 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
196ec2df PP |
912 | { |
913 | struct lttng_ust_excluder_node *excluder; | |
914 | ||
915 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
916 | return 0; | |
917 | } | |
918 | ||
919 | /* | |
920 | * If the matching event matches with an excluder, | |
921 | * return 'does not match' | |
922 | */ | |
923 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
924 | int count; | |
925 | ||
926 | for (count = 0; count < excluder->excluder.count; count++) { | |
927 | int len; | |
928 | char *excluder_name; | |
929 | ||
930 | excluder_name = (char *) (excluder->excluder.names) | |
931 | + count * LTTNG_UST_SYM_NAME_LEN; | |
932 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 933 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 934 | return 0; |
ed5b5bbd JI |
935 | } |
936 | } | |
196ec2df | 937 | return 1; |
ed5b5bbd | 938 | } |
e450e339 | 939 | case LTTNG_ENABLER_FORMAT_EVENT: |
e58095ef MD |
940 | return lttng_desc_match_event_enabler(desc, enabler); |
941 | default: | |
942 | return -EINVAL; | |
943 | } | |
944 | } | |
945 | ||
946 | static | |
d871c65b FD |
947 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
948 | struct lttng_event *event) | |
e58095ef | 949 | { |
d871c65b FD |
950 | if (lttng_desc_match_enabler(event->desc, |
951 | lttng_event_enabler_as_enabler(event_enabler)) | |
952 | && event->chan == event_enabler->chan) | |
d970f72e MD |
953 | return 1; |
954 | else | |
955 | return 0; | |
e58095ef MD |
956 | } |
957 | ||
d8d2416d FD |
958 | static |
959 | int lttng_event_notifier_enabler_match_event_notifier( | |
960 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
961 | struct lttng_event_notifier *event_notifier) | |
962 | { | |
963 | int desc_matches = lttng_desc_match_enabler(event_notifier->desc, | |
964 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
965 | ||
966 | if (desc_matches && event_notifier->group == event_notifier_enabler->group && | |
967 | event_notifier->user_token == event_notifier_enabler->user_token) | |
968 | return 1; | |
969 | else | |
970 | return 0; | |
971 | } | |
972 | ||
e58095ef | 973 | static |
d871c65b FD |
974 | struct lttng_enabler_ref *lttng_enabler_ref( |
975 | struct cds_list_head *enabler_ref_list, | |
e58095ef MD |
976 | struct lttng_enabler *enabler) |
977 | { | |
978 | struct lttng_enabler_ref *enabler_ref; | |
979 | ||
d871c65b | 980 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
e58095ef MD |
981 | if (enabler_ref->ref == enabler) |
982 | return enabler_ref; | |
983 | } | |
984 | return NULL; | |
985 | } | |
986 | ||
8020ceb5 | 987 | /* |
e58095ef MD |
988 | * Create struct lttng_event if it is missing and present in the list of |
989 | * tracepoint probes. | |
8020ceb5 | 990 | */ |
e58095ef | 991 | static |
d871c65b | 992 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 993 | { |
d871c65b | 994 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
995 | struct lttng_probe_desc *probe_desc; |
996 | const struct lttng_event_desc *desc; | |
997 | struct lttng_event *event; | |
998 | int i; | |
999 | struct cds_list_head *probe_list; | |
1000 | ||
1001 | probe_list = lttng_get_probe_list_head(); | |
1002 | /* | |
1003 | * For each probe event, if we find that a probe event matches | |
1004 | * our enabler, create an associated lttng_event if not | |
1005 | * already present. | |
1006 | */ | |
1007 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1008 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
1009 | int ret; |
1010 | bool found = false; | |
d56fa719 MD |
1011 | struct cds_hlist_head *head; |
1012 | struct cds_hlist_node *node; | |
e58095ef MD |
1013 | |
1014 | desc = probe_desc->event_desc[i]; | |
d871c65b FD |
1015 | if (!lttng_desc_match_enabler(desc, |
1016 | lttng_event_enabler_as_enabler(event_enabler))) | |
e58095ef MD |
1017 | continue; |
1018 | ||
fb470188 FD |
1019 | head = borrow_hash_table_bucket( |
1020 | session->events_ht.table, | |
1021 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
1022 | ||
d56fa719 | 1023 | cds_hlist_for_each_entry(event, node, head, hlist) { |
d970f72e | 1024 | if (event->desc == desc |
d871c65b | 1025 | && event->chan == event_enabler->chan) { |
98a97f24 | 1026 | found = true; |
3140bffe FD |
1027 | break; |
1028 | } | |
e58095ef MD |
1029 | } |
1030 | if (found) | |
1031 | continue; | |
1032 | ||
1033 | /* | |
1034 | * We need to create an event for this | |
1035 | * event probe. | |
1036 | */ | |
1037 | ret = lttng_event_create(probe_desc->event_desc[i], | |
d871c65b | 1038 | event_enabler->chan); |
e58095ef | 1039 | if (ret) { |
32ce8569 MD |
1040 | DBG("Unable to create event %s, error %d\n", |
1041 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 1042 | } |
8165c8da | 1043 | } |
8020ceb5 | 1044 | } |
8020ceb5 MD |
1045 | } |
1046 | ||
a44d07da FD |
1047 | static |
1048 | void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc, | |
d8d2416d FD |
1049 | void (*event_func)(struct lttng_session *session, |
1050 | struct lttng_event *event), | |
1051 | void (*event_notifier_func)(struct lttng_event_notifier *event_notifier)) | |
35ac38cb FD |
1052 | { |
1053 | struct cds_hlist_node *node, *tmp_node; | |
1054 | struct cds_list_head *sessionsp; | |
a44d07da | 1055 | unsigned int i; |
35ac38cb FD |
1056 | |
1057 | /* Get handle on list of sessions. */ | |
1058 | sessionsp = _lttng_get_sessions(); | |
1059 | ||
1060 | /* | |
a44d07da FD |
1061 | * Iterate over all events in the probe provider descriptions and |
1062 | * sessions to queue the unregistration of the events. | |
35ac38cb FD |
1063 | */ |
1064 | for (i = 0; i < provider_desc->nr_events; i++) { | |
1065 | const struct lttng_event_desc *event_desc; | |
d8d2416d FD |
1066 | struct lttng_event_notifier_group *event_notifier_group; |
1067 | struct lttng_event_notifier *event_notifier; | |
a44d07da FD |
1068 | struct lttng_session *session; |
1069 | struct cds_hlist_head *head; | |
1070 | struct lttng_event *event; | |
35ac38cb FD |
1071 | |
1072 | event_desc = provider_desc->event_desc[i]; | |
35ac38cb | 1073 | |
a44d07da FD |
1074 | /* |
1075 | * Iterate over all session to find the current event | |
1076 | * description. | |
1077 | */ | |
35ac38cb FD |
1078 | cds_list_for_each_entry(session, sessionsp, node) { |
1079 | /* | |
a44d07da FD |
1080 | * Get the list of events in the hashtable bucket and |
1081 | * iterate to find the event matching this descriptor. | |
35ac38cb | 1082 | */ |
fb470188 FD |
1083 | head = borrow_hash_table_bucket( |
1084 | session->events_ht.table, | |
1085 | LTTNG_UST_EVENT_HT_SIZE, event_desc); | |
1086 | ||
a44d07da | 1087 | cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) { |
35ac38cb | 1088 | if (event_desc == event->desc) { |
a44d07da | 1089 | event_func(session, event); |
35ac38cb FD |
1090 | break; |
1091 | } | |
1092 | } | |
1093 | } | |
d8d2416d FD |
1094 | |
1095 | /* | |
1096 | * Iterate over all event_notifier groups to find the current event | |
1097 | * description. | |
1098 | */ | |
1099 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1100 | /* | |
1101 | * Get the list of event_notifiers in the hashtable bucket and | |
1102 | * iterate to find the event_notifier matching this | |
1103 | * descriptor. | |
1104 | */ | |
1105 | head = borrow_hash_table_bucket( | |
1106 | event_notifier_group->event_notifiers_ht.table, | |
1107 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, event_desc); | |
1108 | ||
1109 | cds_hlist_for_each_entry_safe(event_notifier, node, tmp_node, head, hlist) { | |
1110 | if (event_desc == event_notifier->desc) { | |
1111 | event_notifier_func(event_notifier); | |
1112 | break; | |
1113 | } | |
1114 | } | |
1115 | } | |
35ac38cb | 1116 | } |
a44d07da FD |
1117 | } |
1118 | ||
1119 | static | |
1120 | void _unregister_event(struct lttng_session *session, | |
1121 | struct lttng_event *event) | |
1122 | { | |
1123 | _lttng_event_unregister(event); | |
1124 | } | |
1125 | ||
1126 | static | |
1127 | void _event_enum_destroy(struct lttng_session *session, | |
1128 | struct lttng_event *event) | |
1129 | { | |
1130 | unsigned int i; | |
1131 | ||
1132 | /* Destroy enums of the current event. */ | |
1133 | for (i = 0; i < event->desc->nr_fields; i++) { | |
1134 | const struct lttng_enum_desc *enum_desc; | |
1135 | const struct lttng_event_field *field; | |
1136 | struct lttng_enum *curr_enum; | |
1137 | ||
1138 | field = &(event->desc->fields[i]); | |
1139 | switch (field->type.atype) { | |
1140 | case atype_enum: | |
1141 | enum_desc = field->type.u.legacy.basic.enumeration.desc; | |
1142 | break; | |
1143 | case atype_enum_nestable: | |
1144 | enum_desc = field->type.u.enum_nestable.desc; | |
1145 | break; | |
1146 | default: | |
1147 | continue; | |
1148 | } | |
1149 | ||
1150 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); | |
1151 | if (curr_enum) { | |
1152 | _lttng_enum_destroy(curr_enum); | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | /* Destroy event. */ | |
1157 | _lttng_event_destroy(event); | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
1162 | * the probe provider descriptor received as argument. Must me called with the | |
1163 | * ust_lock held. | |
1164 | */ | |
1165 | void lttng_probe_provider_unregister_events( | |
1166 | struct lttng_probe_desc *provider_desc) | |
1167 | { | |
1168 | /* | |
1169 | * Iterate over all events in the probe provider descriptions and sessions | |
1170 | * to queue the unregistration of the events. | |
1171 | */ | |
d8d2416d FD |
1172 | probe_provider_event_for_each(provider_desc, _unregister_event, |
1173 | _lttng_event_notifier_unregister); | |
35ac38cb FD |
1174 | |
1175 | /* Wait for grace period. */ | |
1176 | synchronize_trace(); | |
1177 | /* Prune the unregistration queue. */ | |
1178 | __tracepoint_probe_prune_release_queue(); | |
1179 | ||
1180 | /* | |
1181 | * It is now safe to destroy the events and remove them from the event list | |
1182 | * and hashtables. | |
1183 | */ | |
d8d2416d FD |
1184 | probe_provider_event_for_each(provider_desc, _event_enum_destroy, |
1185 | _lttng_event_notifier_destroy); | |
35ac38cb FD |
1186 | } |
1187 | ||
8020ceb5 | 1188 | /* |
d8d2416d | 1189 | * Create events associated with an event enabler (if not already present), |
e58095ef | 1190 | * and add backward reference from the event to the enabler. |
8020ceb5 MD |
1191 | */ |
1192 | static | |
d871c65b | 1193 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1194 | { |
d871c65b | 1195 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1196 | struct lttng_event *event; |
1197 | ||
d871c65b | 1198 | if (!lttng_event_enabler_as_enabler(event_enabler)->enabled) |
de713d8a FD |
1199 | goto end; |
1200 | ||
e58095ef | 1201 | /* First ensure that probe events are created for this enabler. */ |
d871c65b | 1202 | lttng_create_event_if_missing(event_enabler); |
e58095ef MD |
1203 | |
1204 | /* For each event matching enabler in session event list. */ | |
1205 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1206 | struct lttng_enabler_ref *enabler_ref; | |
1207 | ||
d871c65b | 1208 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
e58095ef MD |
1209 | continue; |
1210 | ||
d871c65b FD |
1211 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
1212 | lttng_event_enabler_as_enabler(event_enabler)); | |
e58095ef MD |
1213 | if (!enabler_ref) { |
1214 | /* | |
1215 | * If no backward ref, create it. | |
1216 | * Add backward ref from event to enabler. | |
1217 | */ | |
1218 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1219 | if (!enabler_ref) | |
1220 | return -ENOMEM; | |
d871c65b FD |
1221 | enabler_ref->ref = lttng_event_enabler_as_enabler( |
1222 | event_enabler); | |
e58095ef MD |
1223 | cds_list_add(&enabler_ref->node, |
1224 | &event->enablers_ref_head); | |
8165c8da | 1225 | } |
e58095ef MD |
1226 | |
1227 | /* | |
1228 | * Link filter bytecodes if not linked yet. | |
1229 | */ | |
53b9d7db FD |
1230 | lttng_enabler_link_bytecode(event->desc, |
1231 | &session->ctx, | |
a56fd376 | 1232 | &event->filter_bytecode_runtime_head, |
621c07fc | 1233 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
e58095ef MD |
1234 | |
1235 | /* TODO: merge event context. */ | |
1236 | } | |
de713d8a | 1237 | end: |
e58095ef MD |
1238 | return 0; |
1239 | } | |
1240 | ||
1241 | /* | |
1242 | * Called at library load: connect the probe on all enablers matching | |
1243 | * this event. | |
5f733922 | 1244 | * Called with session mutex held. |
e58095ef | 1245 | */ |
5f733922 | 1246 | int lttng_fix_pending_events(void) |
e58095ef MD |
1247 | { |
1248 | struct lttng_session *session; | |
1249 | ||
1250 | cds_list_for_each_entry(session, &sessions, node) { | |
d871c65b | 1251 | lttng_session_lazy_sync_event_enablers(session); |
8020ceb5 | 1252 | } |
e58095ef MD |
1253 | return 0; |
1254 | } | |
1255 | ||
d8d2416d FD |
1256 | int lttng_fix_pending_event_notifiers(void) |
1257 | { | |
1258 | struct lttng_event_notifier_group *event_notifier_group; | |
1259 | ||
1260 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1261 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1262 | } | |
1263 | return 0; | |
1264 | } | |
1265 | ||
246be17e | 1266 | /* |
37dddb65 MD |
1267 | * For each session of the owner thread, execute pending statedump. |
1268 | * Only dump state for the sessions owned by the caller thread, because | |
1269 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 1270 | */ |
3327ac33 | 1271 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
1272 | { |
1273 | struct lttng_session *session; | |
1274 | ||
37dddb65 | 1275 | /* Execute state dump */ |
cf73e0fe | 1276 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
1277 | |
1278 | /* Clear pending state dump */ | |
3327ac33 MD |
1279 | if (ust_lock()) { |
1280 | goto end; | |
1281 | } | |
246be17e | 1282 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
1283 | if (session->owner != owner) |
1284 | continue; | |
1285 | if (!session->statedump_pending) | |
1286 | continue; | |
1287 | session->statedump_pending = 0; | |
246be17e | 1288 | } |
3327ac33 | 1289 | end: |
37dddb65 | 1290 | ust_unlock(); |
3327ac33 | 1291 | return; |
246be17e PW |
1292 | } |
1293 | ||
e58095ef MD |
1294 | /* |
1295 | * Only used internally at session destruction. | |
1296 | */ | |
1297 | static | |
1298 | void _lttng_event_destroy(struct lttng_event *event) | |
1299 | { | |
1300 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1301 | ||
35ac38cb | 1302 | /* Remove from event list. */ |
e58095ef | 1303 | cds_list_del(&event->node); |
35ac38cb FD |
1304 | /* Remove from event hash table. */ |
1305 | cds_hlist_del(&event->hlist); | |
1306 | ||
8020ceb5 | 1307 | lttng_destroy_context(event->ctx); |
f488575f | 1308 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1309 | /* Free event enabler refs */ |
1310 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1311 | &event->enablers_ref_head, node) | |
1312 | free(enabler_ref); | |
b5234c06 | 1313 | free(event); |
8020ceb5 MD |
1314 | } |
1315 | ||
c785c634 MD |
1316 | static |
1317 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1318 | { | |
1319 | cds_list_del(&_enum->node); | |
35ac38cb | 1320 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1321 | free(_enum); |
1322 | } | |
1323 | ||
003fedf4 | 1324 | void lttng_ust_events_exit(void) |
8020ceb5 | 1325 | { |
7dd08bec | 1326 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1327 | |
e58095ef | 1328 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1329 | lttng_session_destroy(session); |
8020ceb5 | 1330 | } |
457a6b58 | 1331 | |
e58095ef MD |
1332 | /* |
1333 | * Enabler management. | |
1334 | */ | |
d871c65b FD |
1335 | struct lttng_event_enabler *lttng_event_enabler_create( |
1336 | enum lttng_enabler_format_type format_type, | |
e58095ef MD |
1337 | struct lttng_ust_event *event_param, |
1338 | struct lttng_channel *chan) | |
457a6b58 | 1339 | { |
d871c65b | 1340 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1341 | |
d871c65b FD |
1342 | event_enabler = zmalloc(sizeof(*event_enabler)); |
1343 | if (!event_enabler) | |
e58095ef | 1344 | return NULL; |
d871c65b FD |
1345 | event_enabler->base.format_type = format_type; |
1346 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1347 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); | |
1348 | memcpy(&event_enabler->base.event_param, event_param, | |
1349 | sizeof(event_enabler->base.event_param)); | |
1350 | event_enabler->chan = chan; | |
e58095ef | 1351 | /* ctx left NULL */ |
d871c65b FD |
1352 | event_enabler->base.enabled = 0; |
1353 | cds_list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); | |
1354 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1355 | ||
1356 | return event_enabler; | |
457a6b58 MD |
1357 | } |
1358 | ||
d8d2416d FD |
1359 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
1360 | struct lttng_event_notifier_group *event_notifier_group, | |
1361 | enum lttng_enabler_format_type format_type, | |
1362 | struct lttng_ust_event_notifier *event_notifier_param) | |
1363 | { | |
1364 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1365 | ||
1366 | event_notifier_enabler = zmalloc(sizeof(*event_notifier_enabler)); | |
1367 | if (!event_notifier_enabler) | |
1368 | return NULL; | |
1369 | event_notifier_enabler->base.format_type = format_type; | |
1370 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
1371 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.excluder_head); | |
1372 | ||
1373 | event_notifier_enabler->user_token = event_notifier_param->event.token; | |
1374 | ||
1375 | memcpy(&event_notifier_enabler->base.event_param.name, | |
1376 | event_notifier_param->event.name, | |
1377 | sizeof(event_notifier_enabler->base.event_param.name)); | |
1378 | event_notifier_enabler->base.event_param.instrumentation = | |
1379 | event_notifier_param->event.instrumentation; | |
1380 | event_notifier_enabler->base.event_param.loglevel = | |
1381 | event_notifier_param->event.loglevel; | |
1382 | event_notifier_enabler->base.event_param.loglevel_type = | |
1383 | event_notifier_param->event.loglevel_type; | |
1384 | ||
1385 | event_notifier_enabler->base.enabled = 0; | |
1386 | event_notifier_enabler->group = event_notifier_group; | |
1387 | ||
1388 | cds_list_add(&event_notifier_enabler->node, | |
1389 | &event_notifier_group->enablers_head); | |
1390 | ||
1391 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1392 | ||
1393 | return event_notifier_enabler; | |
1394 | } | |
1395 | ||
d871c65b | 1396 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1397 | { |
d871c65b FD |
1398 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
1399 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1400 | ||
e58095ef | 1401 | return 0; |
457a6b58 | 1402 | } |
457a6b58 | 1403 | |
d871c65b | 1404 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1405 | { |
d871c65b FD |
1406 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1407 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1408 | ||
e58095ef MD |
1409 | return 0; |
1410 | } | |
457a6b58 | 1411 | |
d871c65b | 1412 | static |
a56fd376 | 1413 | void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
ab249ecf | 1414 | struct lttng_ust_bytecode_node *bytecode) |
e58095ef MD |
1415 | { |
1416 | bytecode->enabler = enabler; | |
1417 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
d871c65b FD |
1418 | } |
1419 | ||
a56fd376 | 1420 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
ab249ecf | 1421 | struct lttng_ust_bytecode_node *bytecode) |
d871c65b | 1422 | { |
a56fd376 | 1423 | _lttng_enabler_attach_filter_bytecode( |
d871c65b FD |
1424 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
1425 | ||
1426 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
e58095ef | 1427 | return 0; |
0bfb5cbd JI |
1428 | } |
1429 | ||
d871c65b FD |
1430 | static |
1431 | void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
0bfb5cbd JI |
1432 | struct lttng_ust_excluder_node *excluder) |
1433 | { | |
1434 | excluder->enabler = enabler; | |
1435 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
d871c65b FD |
1436 | } |
1437 | ||
1438 | int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler, | |
1439 | struct lttng_ust_excluder_node *excluder) | |
1440 | { | |
1441 | _lttng_enabler_attach_exclusion( | |
1442 | lttng_event_enabler_as_enabler(event_enabler), excluder); | |
1443 | ||
1444 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
0bfb5cbd | 1445 | return 0; |
e58095ef | 1446 | } |
f488575f | 1447 | |
d8d2416d FD |
1448 | int lttng_event_notifier_enabler_enable( |
1449 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1450 | { | |
1451 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
1452 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1453 | ||
1454 | return 0; | |
1455 | } | |
1456 | ||
1457 | int lttng_event_notifier_enabler_disable( | |
1458 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1459 | { | |
1460 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
1461 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1462 | ||
1463 | return 0; | |
1464 | } | |
1465 | ||
a56fd376 | 1466 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
d8d2416d | 1467 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
ab249ecf | 1468 | struct lttng_ust_bytecode_node *bytecode) |
d8d2416d | 1469 | { |
a56fd376 | 1470 | _lttng_enabler_attach_filter_bytecode( |
d8d2416d FD |
1471 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
1472 | bytecode); | |
1473 | ||
1474 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1475 | return 0; | |
1476 | } | |
1477 | ||
1478 | int lttng_event_notifier_enabler_attach_exclusion( | |
1479 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1480 | struct lttng_ust_excluder_node *excluder) | |
1481 | { | |
1482 | _lttng_enabler_attach_exclusion( | |
1483 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), | |
1484 | excluder); | |
1485 | ||
1486 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1487 | return 0; | |
1488 | } | |
1489 | ||
e58095ef | 1490 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1491 | union ust_args *uargs, |
e58095ef MD |
1492 | struct lttng_ctx **ctx, struct lttng_session *session) |
1493 | { | |
457a6b58 | 1494 | /* |
e58095ef MD |
1495 | * We cannot attach a context after trace has been started for a |
1496 | * session because the metadata does not allow expressing this | |
1497 | * information outside of the original channel scope. | |
457a6b58 | 1498 | */ |
e58095ef MD |
1499 | if (session->been_active) |
1500 | return -EPERM; | |
457a6b58 | 1501 | |
e58095ef MD |
1502 | switch (context_param->ctx) { |
1503 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1504 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1505 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1506 | { | |
1507 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1508 | ||
1509 | perf_ctx_param = &context_param->u.perf_counter; | |
1510 | return lttng_add_perf_counter_to_ctx( | |
1511 | perf_ctx_param->type, | |
1512 | perf_ctx_param->config, | |
1513 | perf_ctx_param->name, | |
1514 | ctx); | |
1515 | } | |
e58095ef MD |
1516 | case LTTNG_UST_CONTEXT_VTID: |
1517 | return lttng_add_vtid_to_ctx(ctx); | |
1518 | case LTTNG_UST_CONTEXT_VPID: | |
1519 | return lttng_add_vpid_to_ctx(ctx); | |
1520 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1521 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1522 | case LTTNG_UST_CONTEXT_IP: |
1523 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1524 | case LTTNG_UST_CONTEXT_CPU_ID: |
1525 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1526 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1527 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1528 | ctx); | |
735bef47 MJ |
1529 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1530 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1531 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1532 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1533 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1534 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1535 | case LTTNG_UST_CONTEXT_NET_NS: | |
1536 | return lttng_add_net_ns_to_ctx(ctx); | |
1537 | case LTTNG_UST_CONTEXT_PID_NS: | |
1538 | return lttng_add_pid_ns_to_ctx(ctx); | |
cefef7a7 MJ |
1539 | case LTTNG_UST_CONTEXT_TIME_NS: |
1540 | return lttng_add_time_ns_to_ctx(ctx); | |
735bef47 MJ |
1541 | case LTTNG_UST_CONTEXT_USER_NS: |
1542 | return lttng_add_user_ns_to_ctx(ctx); | |
1543 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1544 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1545 | case LTTNG_UST_CONTEXT_VUID: |
1546 | return lttng_add_vuid_to_ctx(ctx); | |
1547 | case LTTNG_UST_CONTEXT_VEUID: | |
1548 | return lttng_add_veuid_to_ctx(ctx); | |
1549 | case LTTNG_UST_CONTEXT_VSUID: | |
1550 | return lttng_add_vsuid_to_ctx(ctx); | |
1551 | case LTTNG_UST_CONTEXT_VGID: | |
1552 | return lttng_add_vgid_to_ctx(ctx); | |
1553 | case LTTNG_UST_CONTEXT_VEGID: | |
1554 | return lttng_add_vegid_to_ctx(ctx); | |
1555 | case LTTNG_UST_CONTEXT_VSGID: | |
1556 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1557 | default: |
1558 | return -EINVAL; | |
457a6b58 | 1559 | } |
457a6b58 MD |
1560 | } |
1561 | ||
d871c65b | 1562 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
e58095ef | 1563 | struct lttng_ust_context *context_param) |
457a6b58 | 1564 | { |
e58095ef | 1565 | return -ENOSYS; |
457a6b58 MD |
1566 | } |
1567 | ||
d871c65b | 1568 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1569 | { |
d871c65b FD |
1570 | if (!event_enabler) { |
1571 | return; | |
0f63324a | 1572 | } |
d871c65b | 1573 | cds_list_del(&event_enabler->node); |
0f63324a | 1574 | |
d871c65b | 1575 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef | 1576 | |
d871c65b FD |
1577 | lttng_destroy_context(event_enabler->ctx); |
1578 | free(event_enabler); | |
457a6b58 MD |
1579 | } |
1580 | ||
e58095ef | 1581 | /* |
d871c65b | 1582 | * lttng_session_sync_event_enablers should be called just before starting a |
e58095ef MD |
1583 | * session. |
1584 | */ | |
457a6b58 | 1585 | static |
d871c65b | 1586 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1587 | { |
d871c65b | 1588 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1589 | struct lttng_event *event; |
457a6b58 | 1590 | |
d871c65b FD |
1591 | cds_list_for_each_entry(event_enabler, &session->enablers_head, node) |
1592 | lttng_event_enabler_ref_events(event_enabler); | |
e58095ef MD |
1593 | /* |
1594 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1595 | * and its channel and session transient states are enabled, we |
1596 | * enable the event, else we disable it. | |
e58095ef MD |
1597 | */ |
1598 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1599 | struct lttng_enabler_ref *enabler_ref; | |
1600 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1601 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1602 | |
1603 | /* Enable events */ | |
1604 | cds_list_for_each_entry(enabler_ref, | |
1605 | &event->enablers_ref_head, node) { | |
1606 | if (enabler_ref->ref->enabled) { | |
1607 | enabled = 1; | |
1608 | break; | |
1609 | } | |
1610 | } | |
ac6b4ac6 MD |
1611 | /* |
1612 | * Enabled state is based on union of enablers, with | |
1613 | * intesection of session and channel transient enable | |
1614 | * states. | |
1615 | */ | |
1616 | enabled = enabled && session->tstate && event->chan->tstate; | |
1617 | ||
1618 | CMM_STORE_SHARED(event->enabled, enabled); | |
1619 | /* | |
1620 | * Sync tracepoint registration with event enabled | |
1621 | * state. | |
1622 | */ | |
1623 | if (enabled) { | |
1624 | if (!event->registered) | |
1625 | register_event(event); | |
1626 | } else { | |
1627 | if (event->registered) | |
1628 | unregister_event(event); | |
1629 | } | |
457a6b58 | 1630 | |
1f49fc05 | 1631 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1632 | cds_list_for_each_entry(enabler_ref, |
1633 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1634 | if (enabler_ref->ref->enabled |
1635 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1636 | has_enablers_without_bytecode = 1; |
1637 | break; | |
1638 | } | |
1639 | } | |
1640 | event->has_enablers_without_bytecode = | |
1641 | has_enablers_without_bytecode; | |
1642 | ||
e58095ef MD |
1643 | /* Enable filters */ |
1644 | cds_list_for_each_entry(runtime, | |
a56fd376 | 1645 | &event->filter_bytecode_runtime_head, node) { |
4d451c15 | 1646 | lttng_bytecode_filter_sync_state(runtime); |
457a6b58 MD |
1647 | } |
1648 | } | |
baa1e0bc | 1649 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1650 | } |
1651 | ||
d8d2416d FD |
1652 | static |
1653 | void lttng_create_event_notifier_if_missing( | |
1654 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1655 | { | |
1656 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1657 | struct lttng_probe_desc *probe_desc; | |
1658 | struct cds_list_head *probe_list; | |
1659 | int i; | |
1660 | ||
1661 | probe_list = lttng_get_probe_list_head(); | |
1662 | ||
1663 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1664 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1665 | int ret; | |
1666 | bool found = false; | |
1667 | const struct lttng_event_desc *desc; | |
1668 | struct lttng_event_notifier *event_notifier; | |
1669 | struct cds_hlist_head *head; | |
1670 | struct cds_hlist_node *node; | |
1671 | ||
1672 | desc = probe_desc->event_desc[i]; | |
1673 | if (!lttng_desc_match_enabler(desc, | |
1674 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1675 | continue; | |
1676 | ||
1677 | /* | |
1678 | * Given the current event_notifier group, get the bucket that | |
1679 | * the target event_notifier would be if it was already | |
1680 | * created. | |
1681 | */ | |
1682 | head = borrow_hash_table_bucket( | |
1683 | event_notifier_group->event_notifiers_ht.table, | |
1684 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
1685 | ||
1686 | cds_hlist_for_each_entry(event_notifier, node, head, hlist) { | |
1687 | /* | |
1688 | * Check if event_notifier already exists by checking | |
1689 | * if the event_notifier and enabler share the same | |
1690 | * description and id. | |
1691 | */ | |
1692 | if (event_notifier->desc == desc && | |
1693 | event_notifier->user_token == event_notifier_enabler->user_token) { | |
1694 | found = true; | |
1695 | break; | |
1696 | } | |
1697 | } | |
1698 | ||
1699 | if (found) | |
1700 | continue; | |
1701 | ||
1702 | /* | |
1703 | * We need to create a event_notifier for this event probe. | |
1704 | */ | |
1705 | ret = lttng_event_notifier_create(desc, | |
1706 | event_notifier_enabler->user_token, | |
1707 | event_notifier_group); | |
1708 | if (ret) { | |
1709 | DBG("Unable to create event_notifier %s, error %d\n", | |
1710 | probe_desc->event_desc[i]->name, ret); | |
1711 | } | |
1712 | } | |
1713 | } | |
1714 | } | |
1715 | ||
1716 | /* | |
1717 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
1718 | */ | |
1719 | static | |
1720 | int lttng_event_notifier_enabler_ref_event_notifiers( | |
1721 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1722 | { | |
1723 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1724 | struct lttng_event_notifier *event_notifier; | |
1725 | ||
1726 | /* | |
1727 | * Only try to create event_notifiers for enablers that are enabled, the user | |
1728 | * might still be attaching filter or exclusion to the | |
1729 | * event_notifier_enabler. | |
1730 | */ | |
1731 | if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled) | |
1732 | goto end; | |
1733 | ||
1734 | /* First, ensure that probe event_notifiers are created for this enabler. */ | |
1735 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
1736 | ||
1737 | /* Link the created event_notifier with its associated enabler. */ | |
1738 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1739 | struct lttng_enabler_ref *enabler_ref; | |
1740 | ||
1741 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
1742 | continue; | |
1743 | ||
1744 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
1745 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1746 | if (!enabler_ref) { | |
1747 | /* | |
1748 | * If no backward ref, create it. | |
1749 | * Add backward ref from event_notifier to enabler. | |
1750 | */ | |
1751 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1752 | if (!enabler_ref) | |
1753 | return -ENOMEM; | |
1754 | ||
1755 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
1756 | event_notifier_enabler); | |
1757 | cds_list_add(&enabler_ref->node, | |
1758 | &event_notifier->enablers_ref_head); | |
1759 | } | |
1760 | ||
1761 | /* | |
1762 | * Link filter bytecodes if not linked yet. | |
1763 | */ | |
1764 | lttng_enabler_link_bytecode(event_notifier->desc, | |
621c07fc FD |
1765 | &event_notifier_group->ctx, |
1766 | &event_notifier->filter_bytecode_runtime_head, | |
1767 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); | |
d8d2416d FD |
1768 | } |
1769 | end: | |
1770 | return 0; | |
1771 | } | |
1772 | ||
1773 | static | |
1774 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
1775 | { | |
1776 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1777 | struct lttng_event_notifier *event_notifier; | |
1778 | ||
1779 | cds_list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
1780 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
1781 | ||
1782 | /* | |
1783 | * For each event_notifier, if at least one of its enablers is enabled, | |
1784 | * we enable the event_notifier, else we disable it. | |
1785 | */ | |
1786 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1787 | struct lttng_enabler_ref *enabler_ref; | |
1788 | struct lttng_bytecode_runtime *runtime; | |
1789 | int enabled = 0, has_enablers_without_bytecode = 0; | |
1790 | ||
1791 | /* Enable event_notifiers */ | |
1792 | cds_list_for_each_entry(enabler_ref, | |
1793 | &event_notifier->enablers_ref_head, node) { | |
1794 | if (enabler_ref->ref->enabled) { | |
1795 | enabled = 1; | |
1796 | break; | |
1797 | } | |
1798 | } | |
1799 | ||
1800 | CMM_STORE_SHARED(event_notifier->enabled, enabled); | |
1801 | /* | |
1802 | * Sync tracepoint registration with event_notifier enabled | |
1803 | * state. | |
1804 | */ | |
1805 | if (enabled) { | |
1806 | if (!event_notifier->registered) | |
1807 | register_event_notifier(event_notifier); | |
1808 | } else { | |
1809 | if (event_notifier->registered) | |
1810 | unregister_event_notifier(event_notifier); | |
1811 | } | |
1812 | ||
1813 | /* Check if has enablers without bytecode enabled */ | |
1814 | cds_list_for_each_entry(enabler_ref, | |
1815 | &event_notifier->enablers_ref_head, node) { | |
1816 | if (enabler_ref->ref->enabled | |
1817 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1818 | has_enablers_without_bytecode = 1; | |
1819 | break; | |
1820 | } | |
1821 | } | |
1822 | event_notifier->has_enablers_without_bytecode = | |
1823 | has_enablers_without_bytecode; | |
1824 | ||
1825 | /* Enable filters */ | |
1826 | cds_list_for_each_entry(runtime, | |
1827 | &event_notifier->filter_bytecode_runtime_head, node) { | |
4d451c15 | 1828 | lttng_bytecode_filter_sync_state(runtime); |
d8d2416d FD |
1829 | } |
1830 | } | |
1831 | __tracepoint_probe_prune_release_queue(); | |
1832 | } | |
1833 | ||
e58095ef MD |
1834 | /* |
1835 | * Apply enablers to session events, adding events to session if need | |
1836 | * be. It is required after each modification applied to an active | |
1837 | * session, and right before session "start". | |
1838 | * "lazy" sync means we only sync if required. | |
1839 | */ | |
1840 | static | |
d871c65b | 1841 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1842 | { |
e58095ef MD |
1843 | /* We can skip if session is not active */ |
1844 | if (!session->active) | |
1845 | return; | |
d871c65b | 1846 | lttng_session_sync_event_enablers(session); |
457a6b58 | 1847 | } |
53569322 MD |
1848 | |
1849 | /* | |
1850 | * Update all sessions with the given app context. | |
1851 | * Called with ust lock held. | |
1852 | * This is invoked when an application context gets loaded/unloaded. It | |
1853 | * ensures the context callbacks are in sync with the application | |
1854 | * context (either app context callbacks, or dummy callbacks). | |
1855 | */ | |
1856 | void lttng_ust_context_set_session_provider(const char *name, | |
1857 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1858 | void (*record)(struct lttng_ctx_field *field, | |
1859 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1860 | struct lttng_channel *chan), | |
1861 | void (*get_value)(struct lttng_ctx_field *field, | |
1862 | struct lttng_ctx_value *value)) | |
1863 | { | |
1864 | struct lttng_session *session; | |
1865 | ||
1866 | cds_list_for_each_entry(session, &sessions, node) { | |
1867 | struct lttng_channel *chan; | |
1868 | struct lttng_event *event; | |
1869 | int ret; | |
1870 | ||
1871 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1872 | name, get_size, record, get_value); | |
1873 | if (ret) | |
1874 | abort(); | |
1875 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1876 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1877 | name, get_size, record, get_value); | |
1878 | if (ret) | |
1879 | abort(); | |
1880 | } | |
1881 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1882 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1883 | name, get_size, record, get_value); | |
1884 | if (ret) | |
1885 | abort(); | |
1886 | } | |
1887 | } | |
1888 | } | |
d8d2416d FD |
1889 | |
1890 | /* | |
1891 | * Update all event_notifier groups with the given app context. | |
1892 | * Called with ust lock held. | |
1893 | * This is invoked when an application context gets loaded/unloaded. It | |
1894 | * ensures the context callbacks are in sync with the application | |
1895 | * context (either app context callbacks, or dummy callbacks). | |
1896 | */ | |
1897 | void lttng_ust_context_set_event_notifier_group_provider(const char *name, | |
1898 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1899 | void (*record)(struct lttng_ctx_field *field, | |
1900 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1901 | struct lttng_channel *chan), | |
1902 | void (*get_value)(struct lttng_ctx_field *field, | |
1903 | struct lttng_ctx_value *value)) | |
1904 | { | |
1905 | struct lttng_event_notifier_group *event_notifier_group; | |
1906 | ||
1907 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1908 | int ret; | |
1909 | ||
1910 | ret = lttng_ust_context_set_provider_rcu( | |
1911 | &event_notifier_group->ctx, | |
1912 | name, get_size, record, get_value); | |
1913 | if (ret) | |
1914 | abort(); | |
1915 | } | |
1916 | } |