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" |
ebabbf58 | 70 | #include "../libcounter/counter.h" |
596c4223 | 71 | #include "jhash.h" |
d8d2416d | 72 | #include <lttng/ust-abi.h> |
8165c8da MD |
73 | |
74 | /* | |
3327ac33 MD |
75 | * All operations within this file are called by the communication |
76 | * thread, under ust_lock protection. | |
8165c8da | 77 | */ |
8165c8da | 78 | |
b5234c06 | 79 | static CDS_LIST_HEAD(sessions); |
d8d2416d | 80 | static CDS_LIST_HEAD(event_notifier_groups); |
8165c8da | 81 | |
37dddb65 MD |
82 | struct cds_list_head *_lttng_get_sessions(void) |
83 | { | |
84 | return &sessions; | |
85 | } | |
86 | ||
7dd08bec | 87 | static void _lttng_event_destroy(struct lttng_event *event); |
d8d2416d FD |
88 | static void _lttng_event_notifier_destroy( |
89 | struct lttng_event_notifier *event_notifier); | |
c785c634 | 90 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 91 | |
e58095ef | 92 | static |
d871c65b | 93 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
e58095ef | 94 | static |
d871c65b | 95 | void lttng_session_sync_event_enablers(struct lttng_session *session); |
e58095ef | 96 | static |
d8d2416d FD |
97 | void lttng_event_notifier_group_sync_enablers( |
98 | struct lttng_event_notifier_group *event_notifier_group); | |
99 | static | |
e58095ef MD |
100 | void lttng_enabler_destroy(struct lttng_enabler *enabler); |
101 | ||
6715d7d1 MD |
102 | /* |
103 | * Called with ust lock held. | |
104 | */ | |
105 | int lttng_session_active(void) | |
106 | { | |
107 | struct lttng_session *iter; | |
108 | ||
109 | cds_list_for_each_entry(iter, &sessions, node) { | |
110 | if (iter->active) | |
111 | return 1; | |
112 | } | |
113 | return 0; | |
114 | } | |
115 | ||
e58095ef MD |
116 | static |
117 | int lttng_loglevel_match(int loglevel, | |
118 | unsigned int has_loglevel, | |
457a6b58 MD |
119 | enum lttng_ust_loglevel_type req_type, |
120 | int req_loglevel) | |
121 | { | |
e58095ef MD |
122 | if (!has_loglevel) |
123 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
124 | switch (req_type) { |
125 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 126 | if (loglevel <= req_loglevel |
67ada458 | 127 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
128 | return 1; |
129 | else | |
130 | return 0; | |
131 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 132 | if (loglevel == req_loglevel |
67ada458 | 133 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
134 | return 1; |
135 | else | |
136 | return 0; | |
137 | case LTTNG_UST_LOGLEVEL_ALL: | |
138 | default: | |
67ada458 | 139 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
140 | return 1; |
141 | else | |
142 | return 0; | |
457a6b58 MD |
143 | } |
144 | } | |
145 | ||
8020ceb5 MD |
146 | void synchronize_trace(void) |
147 | { | |
8020ceb5 | 148 | synchronize_rcu(); |
8020ceb5 MD |
149 | } |
150 | ||
7dd08bec | 151 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 152 | { |
7dd08bec | 153 | struct lttng_session *session; |
74d81a6c | 154 | int i; |
8020ceb5 | 155 | |
7dd08bec | 156 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
157 | if (!session) |
158 | return NULL; | |
51f804ec | 159 | if (lttng_context_init_all(&session->ctx)) { |
53569322 MD |
160 | free(session); |
161 | return NULL; | |
162 | } | |
e58095ef MD |
163 | CDS_INIT_LIST_HEAD(&session->chan_head); |
164 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 165 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 166 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
167 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
168 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
169 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
170 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 171 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
172 | return session; |
173 | } | |
174 | ||
ebabbf58 MD |
175 | struct lttng_counter *lttng_ust_counter_create( |
176 | const char *counter_transport_name, | |
177 | size_t number_dimensions, const struct lttng_counter_dimension *dimensions) | |
178 | { | |
179 | struct lttng_counter_transport *counter_transport = NULL; | |
180 | struct lttng_counter *counter = NULL; | |
181 | ||
182 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
183 | if (!counter_transport) | |
184 | goto notransport; | |
185 | counter = zmalloc(sizeof(struct lttng_counter)); | |
186 | if (!counter) | |
187 | goto nomem; | |
188 | ||
189 | counter->ops = &counter_transport->ops; | |
190 | counter->transport = counter_transport; | |
191 | ||
192 | counter->counter = counter->ops->counter_create( | |
193 | number_dimensions, dimensions, 0, | |
194 | -1, 0, NULL, false); | |
195 | if (!counter->counter) { | |
196 | goto create_error; | |
197 | } | |
198 | ||
199 | return counter; | |
200 | ||
201 | create_error: | |
202 | free(counter); | |
203 | nomem: | |
204 | notransport: | |
205 | return NULL; | |
206 | } | |
207 | ||
208 | static | |
209 | void lttng_ust_counter_destroy(struct lttng_counter *counter) | |
210 | { | |
211 | counter->ops->counter_destroy(counter->counter); | |
212 | free(counter); | |
213 | } | |
214 | ||
d8d2416d FD |
215 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
216 | { | |
217 | struct lttng_event_notifier_group *event_notifier_group; | |
218 | int i; | |
219 | ||
220 | event_notifier_group = zmalloc(sizeof(struct lttng_event_notifier_group)); | |
221 | if (!event_notifier_group) | |
222 | return NULL; | |
223 | ||
51f804ec FD |
224 | /* Add all contexts. */ |
225 | if (lttng_context_init_all(&event_notifier_group->ctx)) { | |
226 | free(event_notifier_group); | |
227 | return NULL; | |
228 | } | |
229 | ||
d8d2416d FD |
230 | CDS_INIT_LIST_HEAD(&event_notifier_group->enablers_head); |
231 | CDS_INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
232 | for (i = 0; i < LTTNG_UST_EVENT_NOTIFIER_HT_SIZE; i++) | |
233 | CDS_INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
234 | ||
235 | cds_list_add(&event_notifier_group->node, &event_notifier_groups); | |
236 | ||
237 | return event_notifier_group; | |
238 | } | |
239 | ||
74d81a6c MD |
240 | /* |
241 | * Only used internally at session destruction. | |
242 | */ | |
243 | static | |
244 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
245 | { | |
246 | struct channel *chan; | |
247 | struct lttng_ust_shm_handle *handle; | |
248 | ||
249 | cds_list_del(<tng_chan->node); | |
250 | lttng_destroy_context(lttng_chan->ctx); | |
251 | chan = lttng_chan->chan; | |
252 | handle = lttng_chan->handle; | |
253 | /* | |
254 | * note: lttng_chan is private data contained within handle. It | |
255 | * will be freed along with the handle. | |
256 | */ | |
257 | channel_destroy(chan, handle, 0); | |
258 | } | |
259 | ||
ac6b4ac6 MD |
260 | static |
261 | void register_event(struct lttng_event *event) | |
262 | { | |
263 | int ret; | |
264 | const struct lttng_event_desc *desc; | |
265 | ||
266 | assert(event->registered == 0); | |
267 | desc = event->desc; | |
baa1e0bc | 268 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
269 | desc->probe_callback, |
270 | event, desc->signature); | |
271 | WARN_ON_ONCE(ret); | |
272 | if (!ret) | |
273 | event->registered = 1; | |
274 | } | |
275 | ||
d8d2416d FD |
276 | static |
277 | void register_event_notifier(struct lttng_event_notifier *event_notifier) | |
278 | { | |
279 | int ret; | |
280 | const struct lttng_event_desc *desc; | |
281 | ||
282 | assert(event_notifier->registered == 0); | |
283 | desc = event_notifier->desc; | |
284 | ret = __tracepoint_probe_register_queue_release(desc->name, | |
285 | desc->u.ext.event_notifier_callback, event_notifier, desc->signature); | |
286 | WARN_ON_ONCE(ret); | |
287 | if (!ret) | |
288 | event_notifier->registered = 1; | |
289 | } | |
290 | ||
ac6b4ac6 MD |
291 | static |
292 | void unregister_event(struct lttng_event *event) | |
293 | { | |
294 | int ret; | |
295 | const struct lttng_event_desc *desc; | |
296 | ||
297 | assert(event->registered == 1); | |
298 | desc = event->desc; | |
baa1e0bc | 299 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
300 | desc->probe_callback, |
301 | event); | |
302 | WARN_ON_ONCE(ret); | |
303 | if (!ret) | |
304 | event->registered = 0; | |
305 | } | |
306 | ||
d8d2416d FD |
307 | static |
308 | void unregister_event_notifier(struct lttng_event_notifier *event_notifier) | |
309 | { | |
310 | int ret; | |
311 | const struct lttng_event_desc *desc; | |
312 | ||
313 | assert(event_notifier->registered == 1); | |
314 | desc = event_notifier->desc; | |
315 | ret = __tracepoint_probe_unregister_queue_release(desc->name, | |
316 | desc->u.ext.event_notifier_callback, event_notifier); | |
317 | WARN_ON_ONCE(ret); | |
318 | if (!ret) | |
319 | event_notifier->registered = 0; | |
320 | } | |
321 | ||
ac6b4ac6 MD |
322 | /* |
323 | * Only used internally at session destruction. | |
324 | */ | |
325 | static | |
326 | void _lttng_event_unregister(struct lttng_event *event) | |
327 | { | |
328 | if (event->registered) | |
329 | unregister_event(event); | |
330 | } | |
331 | ||
d8d2416d FD |
332 | /* |
333 | * Only used internally at session destruction. | |
334 | */ | |
335 | static | |
336 | void _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier) | |
337 | { | |
338 | if (event_notifier->registered) | |
339 | unregister_event_notifier(event_notifier); | |
340 | } | |
341 | ||
7dd08bec | 342 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 343 | { |
7dd08bec MD |
344 | struct lttng_channel *chan, *tmpchan; |
345 | struct lttng_event *event, *tmpevent; | |
c785c634 | 346 | struct lttng_enum *_enum, *tmp_enum; |
d871c65b | 347 | struct lttng_event_enabler *event_enabler, *event_tmpenabler; |
8020ceb5 | 348 | |
b5234c06 | 349 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 350 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 351 | _lttng_event_unregister(event); |
8020ceb5 MD |
352 | } |
353 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
baa1e0bc | 354 | __tracepoint_probe_prune_release_queue(); |
d871c65b | 355 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
e58095ef | 356 | &session->enablers_head, node) |
d871c65b | 357 | lttng_event_enabler_destroy(event_enabler); |
e58095ef MD |
358 | cds_list_for_each_entry_safe(event, tmpevent, |
359 | &session->events_head, node) | |
7dd08bec | 360 | _lttng_event_destroy(event); |
c785c634 MD |
361 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
362 | &session->enums_head, node) | |
363 | _lttng_enum_destroy(_enum); | |
e58095ef | 364 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 365 | _lttng_channel_unmap(chan); |
e58095ef | 366 | cds_list_del(&session->node); |
53569322 | 367 | lttng_destroy_context(session->ctx); |
b5234c06 | 368 | free(session); |
8020ceb5 MD |
369 | } |
370 | ||
d8d2416d FD |
371 | void lttng_event_notifier_group_destroy( |
372 | struct lttng_event_notifier_group *event_notifier_group) | |
373 | { | |
374 | int close_ret; | |
375 | struct lttng_event_notifier_enabler *notifier_enabler, *tmpnotifier_enabler; | |
376 | struct lttng_event_notifier *notifier, *tmpnotifier; | |
377 | ||
378 | if (!event_notifier_group) { | |
379 | return; | |
380 | } | |
381 | ||
382 | cds_list_for_each_entry(notifier, | |
383 | &event_notifier_group->event_notifiers_head, node) | |
384 | _lttng_event_notifier_unregister(notifier); | |
385 | ||
386 | synchronize_trace(); | |
387 | ||
388 | cds_list_for_each_entry_safe(notifier_enabler, tmpnotifier_enabler, | |
389 | &event_notifier_group->enablers_head, node) | |
390 | lttng_event_notifier_enabler_destroy(notifier_enabler); | |
391 | ||
392 | cds_list_for_each_entry_safe(notifier, tmpnotifier, | |
393 | &event_notifier_group->event_notifiers_head, node) | |
394 | _lttng_event_notifier_destroy(notifier); | |
395 | ||
ebabbf58 MD |
396 | if (event_notifier_group->error_counter) |
397 | lttng_ust_counter_destroy(event_notifier_group->error_counter); | |
398 | ||
399 | /* Close the notification fd to the listener of event_notifiers. */ | |
d8d2416d FD |
400 | |
401 | lttng_ust_lock_fd_tracker(); | |
402 | close_ret = close(event_notifier_group->notification_fd); | |
403 | if (!close_ret) { | |
404 | lttng_ust_delete_fd_from_tracker( | |
405 | event_notifier_group->notification_fd); | |
406 | } else { | |
407 | PERROR("close"); | |
408 | abort(); | |
409 | } | |
410 | lttng_ust_unlock_fd_tracker(); | |
411 | ||
412 | cds_list_del(&event_notifier_group->node); | |
413 | ||
414 | free(event_notifier_group); | |
415 | } | |
416 | ||
d871c65b FD |
417 | static |
418 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
419 | { | |
ab249ecf | 420 | struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node; |
d871c65b FD |
421 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
422 | ||
423 | if (!enabler) { | |
424 | return; | |
425 | } | |
426 | ||
427 | /* Destroy filter bytecode */ | |
428 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
429 | &enabler->filter_bytecode_head, node) { | |
430 | free(filter_node); | |
431 | } | |
432 | ||
433 | /* Destroy excluders */ | |
434 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
435 | &enabler->excluder_head, node) { | |
436 | free(excluder_node); | |
437 | } | |
438 | } | |
439 | ||
d8d2416d FD |
440 | void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler) |
441 | { | |
442 | if (!event_notifier_enabler) { | |
443 | return; | |
444 | } | |
445 | ||
446 | cds_list_del(&event_notifier_enabler->node); | |
447 | ||
448 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
449 | ||
450 | free(event_notifier_enabler); | |
451 | } | |
452 | ||
53569322 MD |
453 | static |
454 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
455 | struct lttng_session *session) | |
456 | { | |
457 | const char *enum_name = desc->name; | |
458 | struct lttng_enum *_enum; | |
459 | struct cds_hlist_head *head; | |
53569322 MD |
460 | int ret = 0; |
461 | size_t name_len = strlen(enum_name); | |
462 | uint32_t hash; | |
463 | int notify_socket; | |
464 | ||
b33b46f7 | 465 | /* Check if this enum is already registered for this session. */ |
53569322 MD |
466 | hash = jhash(enum_name, name_len, 0); |
467 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
b33b46f7 FD |
468 | |
469 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
470 | if (_enum) { | |
471 | ret = -EEXIST; | |
472 | goto exist; | |
53569322 MD |
473 | } |
474 | ||
475 | notify_socket = lttng_get_notify_socket(session->owner); | |
476 | if (notify_socket < 0) { | |
477 | ret = notify_socket; | |
478 | goto socket_error; | |
479 | } | |
480 | ||
481 | _enum = zmalloc(sizeof(*_enum)); | |
482 | if (!_enum) { | |
483 | ret = -ENOMEM; | |
484 | goto cache_error; | |
485 | } | |
486 | _enum->session = session; | |
487 | _enum->desc = desc; | |
488 | ||
489 | ret = ustcomm_register_enum(notify_socket, | |
490 | session->objd, | |
491 | enum_name, | |
492 | desc->nr_entries, | |
493 | desc->entries, | |
494 | &_enum->id); | |
495 | if (ret < 0) { | |
496 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
497 | goto sessiond_register_error; | |
498 | } | |
499 | cds_list_add(&_enum->node, &session->enums_head); | |
500 | cds_hlist_add_head(&_enum->hlist, head); | |
501 | return 0; | |
502 | ||
503 | sessiond_register_error: | |
504 | free(_enum); | |
505 | cache_error: | |
506 | socket_error: | |
507 | exist: | |
508 | return ret; | |
509 | } | |
510 | ||
511 | static | |
512 | int lttng_create_enum_check(const struct lttng_type *type, | |
513 | struct lttng_session *session) | |
514 | { | |
515 | switch (type->atype) { | |
516 | case atype_enum: | |
517 | { | |
518 | const struct lttng_enum_desc *enum_desc; | |
519 | int ret; | |
520 | ||
218deb69 MD |
521 | enum_desc = type->u.legacy.basic.enumeration.desc; |
522 | ret = lttng_enum_create(enum_desc, session); | |
523 | if (ret && ret != -EEXIST) { | |
524 | DBG("Unable to create enum error: (%d)", ret); | |
525 | return ret; | |
526 | } | |
527 | break; | |
528 | } | |
529 | case atype_enum_nestable: | |
530 | { | |
531 | const struct lttng_enum_desc *enum_desc; | |
532 | int ret; | |
533 | ||
534 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
535 | ret = lttng_enum_create(enum_desc, session); |
536 | if (ret && ret != -EEXIST) { | |
537 | DBG("Unable to create enum error: (%d)", ret); | |
538 | return ret; | |
539 | } | |
540 | break; | |
541 | } | |
542 | case atype_dynamic: | |
543 | { | |
544 | const struct lttng_event_field *tag_field_generic; | |
545 | const struct lttng_enum_desc *enum_desc; | |
546 | int ret; | |
547 | ||
548 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 549 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
550 | ret = lttng_enum_create(enum_desc, session); |
551 | if (ret && ret != -EEXIST) { | |
552 | DBG("Unable to create enum error: (%d)", ret); | |
553 | return ret; | |
554 | } | |
555 | break; | |
556 | } | |
557 | default: | |
558 | /* TODO: nested types when they become supported. */ | |
559 | break; | |
560 | } | |
561 | return 0; | |
562 | } | |
563 | ||
564 | static | |
565 | int lttng_create_all_event_enums(size_t nr_fields, | |
566 | const struct lttng_event_field *event_fields, | |
567 | struct lttng_session *session) | |
568 | { | |
569 | size_t i; | |
570 | int ret; | |
571 | ||
572 | /* For each field, ensure enum is part of the session. */ | |
573 | for (i = 0; i < nr_fields; i++) { | |
574 | const struct lttng_type *type = &event_fields[i].type; | |
575 | ||
576 | ret = lttng_create_enum_check(type, session); | |
577 | if (ret) | |
578 | return ret; | |
579 | } | |
580 | return 0; | |
581 | } | |
582 | ||
583 | static | |
584 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
585 | const struct lttng_ctx_field *ctx_fields, | |
586 | struct lttng_session *session) | |
587 | { | |
588 | size_t i; | |
589 | int ret; | |
590 | ||
591 | /* For each field, ensure enum is part of the session. */ | |
592 | for (i = 0; i < nr_fields; i++) { | |
593 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
594 | ||
595 | ret = lttng_create_enum_check(type, session); | |
596 | if (ret) | |
597 | return ret; | |
598 | } | |
599 | return 0; | |
600 | } | |
601 | ||
710b8ee3 MD |
602 | /* |
603 | * Ensure that a state-dump will be performed for this session at the end | |
604 | * of the current handle_message(). | |
605 | */ | |
606 | int lttng_session_statedump(struct lttng_session *session) | |
607 | { | |
608 | session->statedump_pending = 1; | |
609 | lttng_ust_sockinfo_session_enabled(session->owner); | |
610 | return 0; | |
611 | } | |
53569322 | 612 | |
7dd08bec | 613 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
614 | { |
615 | int ret = 0; | |
7dd08bec | 616 | struct lttng_channel *chan; |
32ce8569 | 617 | int notify_socket; |
8020ceb5 | 618 | |
8020ceb5 MD |
619 | if (session->active) { |
620 | ret = -EBUSY; | |
621 | goto end; | |
622 | } | |
623 | ||
32ce8569 MD |
624 | notify_socket = lttng_get_notify_socket(session->owner); |
625 | if (notify_socket < 0) | |
626 | return notify_socket; | |
627 | ||
ac6b4ac6 MD |
628 | /* Set transient enabler state to "enabled" */ |
629 | session->tstate = 1; | |
e58095ef | 630 | |
3ff7660f | 631 | /* We need to sync enablers with session before activation. */ |
d871c65b | 632 | lttng_session_sync_event_enablers(session); |
3ff7660f | 633 | |
8020ceb5 MD |
634 | /* |
635 | * Snapshot the number of events per channel to know the type of header | |
636 | * we need to use. | |
637 | */ | |
e58095ef | 638 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 639 | const struct lttng_ctx *ctx; |
83e43212 | 640 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 641 | size_t nr_fields = 0; |
6ca18e66 | 642 | uint32_t chan_id; |
32ce8569 MD |
643 | |
644 | /* don't change it if session stop/restart */ | |
8020ceb5 | 645 | if (chan->header_type) |
32ce8569 MD |
646 | continue; |
647 | ctx = chan->ctx; | |
648 | if (ctx) { | |
649 | nr_fields = ctx->nr_fields; | |
83e43212 | 650 | fields = ctx->fields; |
53569322 MD |
651 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
652 | session); | |
653 | if (ret < 0) { | |
654 | DBG("Error (%d) adding enum to session", ret); | |
655 | return ret; | |
656 | } | |
32ce8569 MD |
657 | } |
658 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 659 | session, |
32ce8569 MD |
660 | session->objd, |
661 | chan->objd, | |
662 | nr_fields, | |
663 | fields, | |
6ca18e66 | 664 | &chan_id, |
32ce8569 | 665 | &chan->header_type); |
b869b5ae MD |
666 | if (ret) { |
667 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 668 | return ret; |
b869b5ae | 669 | } |
6ca18e66 MD |
670 | if (chan_id != chan->id) { |
671 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
672 | chan_id, chan->id); | |
673 | return -EINVAL; | |
674 | } | |
8020ceb5 MD |
675 | } |
676 | ||
ac6b4ac6 | 677 | /* Set atomically the state to "active" */ |
b5234c06 MD |
678 | CMM_ACCESS_ONCE(session->active) = 1; |
679 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 680 | |
710b8ee3 MD |
681 | ret = lttng_session_statedump(session); |
682 | if (ret) | |
683 | return ret; | |
8020ceb5 | 684 | end: |
8020ceb5 MD |
685 | return ret; |
686 | } | |
687 | ||
7dd08bec | 688 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
689 | { |
690 | int ret = 0; | |
691 | ||
8020ceb5 MD |
692 | if (!session->active) { |
693 | ret = -EBUSY; | |
694 | goto end; | |
695 | } | |
ac6b4ac6 | 696 | /* Set atomically the state to "inactive" */ |
b5234c06 | 697 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
698 | |
699 | /* Set transient enabler state to "disabled" */ | |
700 | session->tstate = 0; | |
d871c65b | 701 | lttng_session_sync_event_enablers(session); |
8020ceb5 | 702 | end: |
8020ceb5 MD |
703 | return ret; |
704 | } | |
705 | ||
7dd08bec | 706 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 707 | { |
ac6b4ac6 | 708 | int ret = 0; |
976fe9ea | 709 | |
ac6b4ac6 MD |
710 | if (channel->enabled) { |
711 | ret = -EBUSY; | |
712 | goto end; | |
713 | } | |
714 | /* Set transient enabler state to "enabled" */ | |
715 | channel->tstate = 1; | |
d871c65b | 716 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
717 | /* Set atomically the state to "enabled" */ |
718 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
719 | end: | |
720 | return ret; | |
976fe9ea MD |
721 | } |
722 | ||
7dd08bec | 723 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 724 | { |
ac6b4ac6 | 725 | int ret = 0; |
976fe9ea | 726 | |
ac6b4ac6 MD |
727 | if (!channel->enabled) { |
728 | ret = -EBUSY; | |
729 | goto end; | |
730 | } | |
731 | /* Set atomically the state to "disabled" */ | |
732 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
733 | /* Set transient enabler state to "enabled" */ | |
734 | channel->tstate = 0; | |
d871c65b | 735 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
736 | end: |
737 | return ret; | |
976fe9ea MD |
738 | } |
739 | ||
fb470188 FD |
740 | static inline |
741 | struct cds_hlist_head *borrow_hash_table_bucket( | |
742 | struct cds_hlist_head *hash_table, | |
743 | unsigned int hash_table_size, | |
744 | const struct lttng_event_desc *desc) | |
745 | { | |
746 | const char *event_name; | |
747 | size_t name_len; | |
748 | uint32_t hash; | |
749 | ||
750 | event_name = desc->name; | |
751 | name_len = strlen(event_name); | |
752 | ||
753 | hash = jhash(event_name, name_len, 0); | |
754 | return &hash_table[hash & (hash_table_size - 1)]; | |
755 | } | |
756 | ||
8020ceb5 MD |
757 | /* |
758 | * Supports event creation while tracing session is active. | |
759 | */ | |
e58095ef MD |
760 | static |
761 | int lttng_event_create(const struct lttng_event_desc *desc, | |
762 | struct lttng_channel *chan) | |
8020ceb5 | 763 | { |
7dd08bec | 764 | struct lttng_event *event; |
32ce8569 | 765 | struct lttng_session *session = chan->session; |
d56fa719 | 766 | struct cds_hlist_head *head; |
576599a0 | 767 | int ret = 0; |
32ce8569 MD |
768 | int notify_socket, loglevel; |
769 | const char *uri; | |
8020ceb5 | 770 | |
fb470188 FD |
771 | head = borrow_hash_table_bucket(chan->session->events_ht.table, |
772 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
457a6b58 | 773 | |
32ce8569 MD |
774 | notify_socket = lttng_get_notify_socket(session->owner); |
775 | if (notify_socket < 0) { | |
776 | ret = notify_socket; | |
777 | goto socket_error; | |
778 | } | |
779 | ||
53569322 MD |
780 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
781 | session); | |
c785c634 MD |
782 | if (ret < 0) { |
783 | DBG("Error (%d) adding enum to session", ret); | |
784 | goto create_enum_error; | |
785 | } | |
786 | ||
457a6b58 MD |
787 | /* |
788 | * Check if loglevel match. Refuse to connect event if not. | |
789 | */ | |
7dd08bec | 790 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
791 | if (!event) { |
792 | ret = -ENOMEM; | |
8020ceb5 | 793 | goto cache_error; |
576599a0 | 794 | } |
8020ceb5 | 795 | event->chan = chan; |
e58095ef | 796 | |
ac6b4ac6 MD |
797 | /* Event will be enabled by enabler sync. */ |
798 | event->enabled = 0; | |
799 | event->registered = 0; | |
a56fd376 | 800 | CDS_INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
e58095ef MD |
801 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); |
802 | event->desc = desc; | |
32ce8569 MD |
803 | |
804 | if (desc->loglevel) | |
805 | loglevel = *(*event->desc->loglevel); | |
806 | else | |
807 | loglevel = TRACE_DEFAULT; | |
808 | if (desc->u.ext.model_emf_uri) | |
809 | uri = *(desc->u.ext.model_emf_uri); | |
810 | else | |
811 | uri = NULL; | |
812 | ||
13b21cd6 MD |
813 | /* Fetch event ID from sessiond */ |
814 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 815 | session, |
13b21cd6 MD |
816 | session->objd, |
817 | chan->objd, | |
fb470188 | 818 | desc->name, |
13b21cd6 MD |
819 | loglevel, |
820 | desc->signature, | |
821 | desc->nr_fields, | |
822 | desc->fields, | |
823 | uri, | |
824 | &event->id); | |
825 | if (ret < 0) { | |
826 | DBG("Error (%d) registering event to sessiond", ret); | |
827 | goto sessiond_register_error; | |
32ce8569 | 828 | } |
2b213b16 | 829 | |
e58095ef | 830 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 831 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 832 | return 0; |
8020ceb5 | 833 | |
32ce8569 | 834 | sessiond_register_error: |
b5234c06 | 835 | free(event); |
8020ceb5 | 836 | cache_error: |
c785c634 | 837 | create_enum_error: |
32ce8569 | 838 | socket_error: |
576599a0 | 839 | return ret; |
8020ceb5 MD |
840 | } |
841 | ||
d8d2416d FD |
842 | static |
843 | int lttng_event_notifier_create(const struct lttng_event_desc *desc, | |
844 | uint64_t token, | |
845 | struct lttng_event_notifier_group *event_notifier_group) | |
846 | { | |
847 | struct lttng_event_notifier *event_notifier; | |
848 | struct cds_hlist_head *head; | |
849 | int ret = 0; | |
850 | ||
851 | /* | |
852 | * Get the hashtable bucket the created lttng_event_notifier object | |
853 | * should be inserted. | |
854 | */ | |
855 | head = borrow_hash_table_bucket( | |
856 | event_notifier_group->event_notifiers_ht.table, | |
857 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
858 | ||
859 | event_notifier = zmalloc(sizeof(struct lttng_event_notifier)); | |
860 | if (!event_notifier) { | |
861 | ret = -ENOMEM; | |
862 | goto error; | |
863 | } | |
864 | ||
865 | event_notifier->group = event_notifier_group; | |
866 | event_notifier->user_token = token; | |
867 | ||
868 | /* Event notifier will be enabled by enabler sync. */ | |
869 | event_notifier->enabled = 0; | |
870 | event_notifier->registered = 0; | |
871 | ||
872 | CDS_INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); | |
d37ecb3f | 873 | CDS_INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head); |
d8d2416d FD |
874 | CDS_INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
875 | event_notifier->desc = desc; | |
876 | ||
877 | cds_list_add(&event_notifier->node, | |
878 | &event_notifier_group->event_notifiers_head); | |
879 | cds_hlist_add_head(&event_notifier->hlist, head); | |
880 | ||
881 | return 0; | |
882 | ||
883 | error: | |
884 | return ret; | |
885 | } | |
886 | ||
887 | static | |
888 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
889 | { | |
890 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
891 | ||
892 | /* Remove from event_notifier list. */ | |
893 | cds_list_del(&event_notifier->node); | |
894 | /* Remove from event_notifier hash table. */ | |
895 | cds_hlist_del(&event_notifier->hlist); | |
896 | ||
897 | lttng_free_event_notifier_filter_runtime(event_notifier); | |
898 | ||
899 | /* Free event_notifier enabler refs */ | |
900 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
901 | &event_notifier->enablers_ref_head, node) | |
902 | free(enabler_ref); | |
903 | free(event_notifier); | |
904 | } | |
905 | ||
e58095ef | 906 | static |
196ec2df | 907 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
908 | struct lttng_enabler *enabler) |
909 | { | |
910 | int loglevel = 0; | |
7e2e405c | 911 | unsigned int has_loglevel = 0; |
e58095ef | 912 | |
e450e339 | 913 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f6f42e6 MD |
914 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
915 | desc->name, SIZE_MAX)) | |
e58095ef MD |
916 | return 0; |
917 | if (desc->loglevel) { | |
918 | loglevel = *(*desc->loglevel); | |
919 | has_loglevel = 1; | |
920 | } | |
921 | if (!lttng_loglevel_match(loglevel, | |
922 | has_loglevel, | |
923 | enabler->event_param.loglevel_type, | |
924 | enabler->event_param.loglevel)) | |
925 | return 0; | |
926 | return 1; | |
927 | } | |
928 | ||
929 | static | |
930 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
931 | struct lttng_enabler *enabler) | |
932 | { | |
933 | int loglevel = 0; | |
934 | unsigned int has_loglevel = 0; | |
935 | ||
e450e339 | 936 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
e58095ef MD |
937 | if (strcmp(desc->name, enabler->event_param.name)) |
938 | return 0; | |
939 | if (desc->loglevel) { | |
940 | loglevel = *(*desc->loglevel); | |
941 | has_loglevel = 1; | |
942 | } | |
943 | if (!lttng_loglevel_match(loglevel, | |
944 | has_loglevel, | |
945 | enabler->event_param.loglevel_type, | |
946 | enabler->event_param.loglevel)) | |
947 | return 0; | |
948 | return 1; | |
949 | } | |
950 | ||
951 | static | |
952 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
953 | struct lttng_enabler *enabler) | |
954 | { | |
e450e339 FD |
955 | switch (enabler->format_type) { |
956 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
196ec2df PP |
957 | { |
958 | struct lttng_ust_excluder_node *excluder; | |
959 | ||
960 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
961 | return 0; | |
962 | } | |
963 | ||
964 | /* | |
965 | * If the matching event matches with an excluder, | |
966 | * return 'does not match' | |
967 | */ | |
968 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
969 | int count; | |
970 | ||
971 | for (count = 0; count < excluder->excluder.count; count++) { | |
972 | int len; | |
973 | char *excluder_name; | |
974 | ||
975 | excluder_name = (char *) (excluder->excluder.names) | |
976 | + count * LTTNG_UST_SYM_NAME_LEN; | |
977 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 978 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 979 | return 0; |
ed5b5bbd JI |
980 | } |
981 | } | |
196ec2df | 982 | return 1; |
ed5b5bbd | 983 | } |
e450e339 | 984 | case LTTNG_ENABLER_FORMAT_EVENT: |
e58095ef MD |
985 | return lttng_desc_match_event_enabler(desc, enabler); |
986 | default: | |
987 | return -EINVAL; | |
988 | } | |
989 | } | |
990 | ||
991 | static | |
d871c65b FD |
992 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
993 | struct lttng_event *event) | |
e58095ef | 994 | { |
d871c65b FD |
995 | if (lttng_desc_match_enabler(event->desc, |
996 | lttng_event_enabler_as_enabler(event_enabler)) | |
997 | && event->chan == event_enabler->chan) | |
d970f72e MD |
998 | return 1; |
999 | else | |
1000 | return 0; | |
e58095ef MD |
1001 | } |
1002 | ||
d8d2416d FD |
1003 | static |
1004 | int lttng_event_notifier_enabler_match_event_notifier( | |
1005 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1006 | struct lttng_event_notifier *event_notifier) | |
1007 | { | |
1008 | int desc_matches = lttng_desc_match_enabler(event_notifier->desc, | |
1009 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1010 | ||
1011 | if (desc_matches && event_notifier->group == event_notifier_enabler->group && | |
1012 | event_notifier->user_token == event_notifier_enabler->user_token) | |
1013 | return 1; | |
1014 | else | |
1015 | return 0; | |
1016 | } | |
1017 | ||
e58095ef | 1018 | static |
d871c65b FD |
1019 | struct lttng_enabler_ref *lttng_enabler_ref( |
1020 | struct cds_list_head *enabler_ref_list, | |
e58095ef MD |
1021 | struct lttng_enabler *enabler) |
1022 | { | |
1023 | struct lttng_enabler_ref *enabler_ref; | |
1024 | ||
d871c65b | 1025 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
e58095ef MD |
1026 | if (enabler_ref->ref == enabler) |
1027 | return enabler_ref; | |
1028 | } | |
1029 | return NULL; | |
1030 | } | |
1031 | ||
8020ceb5 | 1032 | /* |
e58095ef MD |
1033 | * Create struct lttng_event if it is missing and present in the list of |
1034 | * tracepoint probes. | |
8020ceb5 | 1035 | */ |
e58095ef | 1036 | static |
d871c65b | 1037 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1038 | { |
d871c65b | 1039 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1040 | struct lttng_probe_desc *probe_desc; |
1041 | const struct lttng_event_desc *desc; | |
1042 | struct lttng_event *event; | |
1043 | int i; | |
1044 | struct cds_list_head *probe_list; | |
1045 | ||
1046 | probe_list = lttng_get_probe_list_head(); | |
1047 | /* | |
1048 | * For each probe event, if we find that a probe event matches | |
1049 | * our enabler, create an associated lttng_event if not | |
1050 | * already present. | |
1051 | */ | |
1052 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1053 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
1054 | int ret; |
1055 | bool found = false; | |
d56fa719 MD |
1056 | struct cds_hlist_head *head; |
1057 | struct cds_hlist_node *node; | |
e58095ef MD |
1058 | |
1059 | desc = probe_desc->event_desc[i]; | |
d871c65b FD |
1060 | if (!lttng_desc_match_enabler(desc, |
1061 | lttng_event_enabler_as_enabler(event_enabler))) | |
e58095ef MD |
1062 | continue; |
1063 | ||
fb470188 FD |
1064 | head = borrow_hash_table_bucket( |
1065 | session->events_ht.table, | |
1066 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
1067 | ||
d56fa719 | 1068 | cds_hlist_for_each_entry(event, node, head, hlist) { |
d970f72e | 1069 | if (event->desc == desc |
d871c65b | 1070 | && event->chan == event_enabler->chan) { |
98a97f24 | 1071 | found = true; |
3140bffe FD |
1072 | break; |
1073 | } | |
e58095ef MD |
1074 | } |
1075 | if (found) | |
1076 | continue; | |
1077 | ||
1078 | /* | |
1079 | * We need to create an event for this | |
1080 | * event probe. | |
1081 | */ | |
1082 | ret = lttng_event_create(probe_desc->event_desc[i], | |
d871c65b | 1083 | event_enabler->chan); |
e58095ef | 1084 | if (ret) { |
32ce8569 MD |
1085 | DBG("Unable to create event %s, error %d\n", |
1086 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 1087 | } |
8165c8da | 1088 | } |
8020ceb5 | 1089 | } |
8020ceb5 MD |
1090 | } |
1091 | ||
a44d07da FD |
1092 | static |
1093 | void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc, | |
d8d2416d FD |
1094 | void (*event_func)(struct lttng_session *session, |
1095 | struct lttng_event *event), | |
1096 | void (*event_notifier_func)(struct lttng_event_notifier *event_notifier)) | |
35ac38cb FD |
1097 | { |
1098 | struct cds_hlist_node *node, *tmp_node; | |
1099 | struct cds_list_head *sessionsp; | |
a44d07da | 1100 | unsigned int i; |
35ac38cb FD |
1101 | |
1102 | /* Get handle on list of sessions. */ | |
1103 | sessionsp = _lttng_get_sessions(); | |
1104 | ||
1105 | /* | |
a44d07da FD |
1106 | * Iterate over all events in the probe provider descriptions and |
1107 | * sessions to queue the unregistration of the events. | |
35ac38cb FD |
1108 | */ |
1109 | for (i = 0; i < provider_desc->nr_events; i++) { | |
1110 | const struct lttng_event_desc *event_desc; | |
d8d2416d FD |
1111 | struct lttng_event_notifier_group *event_notifier_group; |
1112 | struct lttng_event_notifier *event_notifier; | |
a44d07da FD |
1113 | struct lttng_session *session; |
1114 | struct cds_hlist_head *head; | |
1115 | struct lttng_event *event; | |
35ac38cb FD |
1116 | |
1117 | event_desc = provider_desc->event_desc[i]; | |
35ac38cb | 1118 | |
a44d07da FD |
1119 | /* |
1120 | * Iterate over all session to find the current event | |
1121 | * description. | |
1122 | */ | |
35ac38cb FD |
1123 | cds_list_for_each_entry(session, sessionsp, node) { |
1124 | /* | |
a44d07da FD |
1125 | * Get the list of events in the hashtable bucket and |
1126 | * iterate to find the event matching this descriptor. | |
35ac38cb | 1127 | */ |
fb470188 FD |
1128 | head = borrow_hash_table_bucket( |
1129 | session->events_ht.table, | |
1130 | LTTNG_UST_EVENT_HT_SIZE, event_desc); | |
1131 | ||
a44d07da | 1132 | cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) { |
35ac38cb | 1133 | if (event_desc == event->desc) { |
a44d07da | 1134 | event_func(session, event); |
35ac38cb FD |
1135 | break; |
1136 | } | |
1137 | } | |
1138 | } | |
d8d2416d FD |
1139 | |
1140 | /* | |
1141 | * Iterate over all event_notifier groups to find the current event | |
1142 | * description. | |
1143 | */ | |
1144 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1145 | /* | |
1146 | * Get the list of event_notifiers in the hashtable bucket and | |
1147 | * iterate to find the event_notifier matching this | |
1148 | * descriptor. | |
1149 | */ | |
1150 | head = borrow_hash_table_bucket( | |
1151 | event_notifier_group->event_notifiers_ht.table, | |
1152 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, event_desc); | |
1153 | ||
1154 | cds_hlist_for_each_entry_safe(event_notifier, node, tmp_node, head, hlist) { | |
1155 | if (event_desc == event_notifier->desc) { | |
1156 | event_notifier_func(event_notifier); | |
1157 | break; | |
1158 | } | |
1159 | } | |
1160 | } | |
35ac38cb | 1161 | } |
a44d07da FD |
1162 | } |
1163 | ||
1164 | static | |
1165 | void _unregister_event(struct lttng_session *session, | |
1166 | struct lttng_event *event) | |
1167 | { | |
1168 | _lttng_event_unregister(event); | |
1169 | } | |
1170 | ||
1171 | static | |
1172 | void _event_enum_destroy(struct lttng_session *session, | |
1173 | struct lttng_event *event) | |
1174 | { | |
1175 | unsigned int i; | |
1176 | ||
1177 | /* Destroy enums of the current event. */ | |
1178 | for (i = 0; i < event->desc->nr_fields; i++) { | |
1179 | const struct lttng_enum_desc *enum_desc; | |
1180 | const struct lttng_event_field *field; | |
1181 | struct lttng_enum *curr_enum; | |
1182 | ||
1183 | field = &(event->desc->fields[i]); | |
1184 | switch (field->type.atype) { | |
1185 | case atype_enum: | |
1186 | enum_desc = field->type.u.legacy.basic.enumeration.desc; | |
1187 | break; | |
1188 | case atype_enum_nestable: | |
1189 | enum_desc = field->type.u.enum_nestable.desc; | |
1190 | break; | |
1191 | default: | |
1192 | continue; | |
1193 | } | |
1194 | ||
1195 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); | |
1196 | if (curr_enum) { | |
1197 | _lttng_enum_destroy(curr_enum); | |
1198 | } | |
1199 | } | |
1200 | ||
1201 | /* Destroy event. */ | |
1202 | _lttng_event_destroy(event); | |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
1207 | * the probe provider descriptor received as argument. Must me called with the | |
1208 | * ust_lock held. | |
1209 | */ | |
1210 | void lttng_probe_provider_unregister_events( | |
1211 | struct lttng_probe_desc *provider_desc) | |
1212 | { | |
1213 | /* | |
1214 | * Iterate over all events in the probe provider descriptions and sessions | |
1215 | * to queue the unregistration of the events. | |
1216 | */ | |
d8d2416d FD |
1217 | probe_provider_event_for_each(provider_desc, _unregister_event, |
1218 | _lttng_event_notifier_unregister); | |
35ac38cb FD |
1219 | |
1220 | /* Wait for grace period. */ | |
1221 | synchronize_trace(); | |
1222 | /* Prune the unregistration queue. */ | |
1223 | __tracepoint_probe_prune_release_queue(); | |
1224 | ||
1225 | /* | |
1226 | * It is now safe to destroy the events and remove them from the event list | |
1227 | * and hashtables. | |
1228 | */ | |
d8d2416d FD |
1229 | probe_provider_event_for_each(provider_desc, _event_enum_destroy, |
1230 | _lttng_event_notifier_destroy); | |
35ac38cb FD |
1231 | } |
1232 | ||
8020ceb5 | 1233 | /* |
d8d2416d | 1234 | * Create events associated with an event enabler (if not already present), |
e58095ef | 1235 | * and add backward reference from the event to the enabler. |
8020ceb5 MD |
1236 | */ |
1237 | static | |
d871c65b | 1238 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1239 | { |
d871c65b | 1240 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1241 | struct lttng_event *event; |
1242 | ||
d871c65b | 1243 | if (!lttng_event_enabler_as_enabler(event_enabler)->enabled) |
de713d8a FD |
1244 | goto end; |
1245 | ||
e58095ef | 1246 | /* First ensure that probe events are created for this enabler. */ |
d871c65b | 1247 | lttng_create_event_if_missing(event_enabler); |
e58095ef MD |
1248 | |
1249 | /* For each event matching enabler in session event list. */ | |
1250 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1251 | struct lttng_enabler_ref *enabler_ref; | |
1252 | ||
d871c65b | 1253 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
e58095ef MD |
1254 | continue; |
1255 | ||
d871c65b FD |
1256 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
1257 | lttng_event_enabler_as_enabler(event_enabler)); | |
e58095ef MD |
1258 | if (!enabler_ref) { |
1259 | /* | |
1260 | * If no backward ref, create it. | |
1261 | * Add backward ref from event to enabler. | |
1262 | */ | |
1263 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1264 | if (!enabler_ref) | |
1265 | return -ENOMEM; | |
d871c65b FD |
1266 | enabler_ref->ref = lttng_event_enabler_as_enabler( |
1267 | event_enabler); | |
e58095ef MD |
1268 | cds_list_add(&enabler_ref->node, |
1269 | &event->enablers_ref_head); | |
8165c8da | 1270 | } |
e58095ef MD |
1271 | |
1272 | /* | |
1273 | * Link filter bytecodes if not linked yet. | |
1274 | */ | |
53b9d7db FD |
1275 | lttng_enabler_link_bytecode(event->desc, |
1276 | &session->ctx, | |
a56fd376 | 1277 | &event->filter_bytecode_runtime_head, |
621c07fc | 1278 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
e58095ef MD |
1279 | |
1280 | /* TODO: merge event context. */ | |
1281 | } | |
de713d8a | 1282 | end: |
e58095ef MD |
1283 | return 0; |
1284 | } | |
1285 | ||
1286 | /* | |
1287 | * Called at library load: connect the probe on all enablers matching | |
1288 | * this event. | |
5f733922 | 1289 | * Called with session mutex held. |
e58095ef | 1290 | */ |
5f733922 | 1291 | int lttng_fix_pending_events(void) |
e58095ef MD |
1292 | { |
1293 | struct lttng_session *session; | |
1294 | ||
1295 | cds_list_for_each_entry(session, &sessions, node) { | |
d871c65b | 1296 | lttng_session_lazy_sync_event_enablers(session); |
8020ceb5 | 1297 | } |
e58095ef MD |
1298 | return 0; |
1299 | } | |
1300 | ||
d8d2416d FD |
1301 | int lttng_fix_pending_event_notifiers(void) |
1302 | { | |
1303 | struct lttng_event_notifier_group *event_notifier_group; | |
1304 | ||
1305 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1306 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1307 | } | |
1308 | return 0; | |
1309 | } | |
1310 | ||
246be17e | 1311 | /* |
37dddb65 MD |
1312 | * For each session of the owner thread, execute pending statedump. |
1313 | * Only dump state for the sessions owned by the caller thread, because | |
1314 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 1315 | */ |
3327ac33 | 1316 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
1317 | { |
1318 | struct lttng_session *session; | |
1319 | ||
37dddb65 | 1320 | /* Execute state dump */ |
cf73e0fe | 1321 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
1322 | |
1323 | /* Clear pending state dump */ | |
3327ac33 MD |
1324 | if (ust_lock()) { |
1325 | goto end; | |
1326 | } | |
246be17e | 1327 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
1328 | if (session->owner != owner) |
1329 | continue; | |
1330 | if (!session->statedump_pending) | |
1331 | continue; | |
1332 | session->statedump_pending = 0; | |
246be17e | 1333 | } |
3327ac33 | 1334 | end: |
37dddb65 | 1335 | ust_unlock(); |
3327ac33 | 1336 | return; |
246be17e PW |
1337 | } |
1338 | ||
e58095ef MD |
1339 | /* |
1340 | * Only used internally at session destruction. | |
1341 | */ | |
1342 | static | |
1343 | void _lttng_event_destroy(struct lttng_event *event) | |
1344 | { | |
1345 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1346 | ||
35ac38cb | 1347 | /* Remove from event list. */ |
e58095ef | 1348 | cds_list_del(&event->node); |
35ac38cb FD |
1349 | /* Remove from event hash table. */ |
1350 | cds_hlist_del(&event->hlist); | |
1351 | ||
8020ceb5 | 1352 | lttng_destroy_context(event->ctx); |
f488575f | 1353 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1354 | /* Free event enabler refs */ |
1355 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1356 | &event->enablers_ref_head, node) | |
1357 | free(enabler_ref); | |
b5234c06 | 1358 | free(event); |
8020ceb5 MD |
1359 | } |
1360 | ||
c785c634 MD |
1361 | static |
1362 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1363 | { | |
1364 | cds_list_del(&_enum->node); | |
35ac38cb | 1365 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1366 | free(_enum); |
1367 | } | |
1368 | ||
003fedf4 | 1369 | void lttng_ust_events_exit(void) |
8020ceb5 | 1370 | { |
7dd08bec | 1371 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1372 | |
e58095ef | 1373 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1374 | lttng_session_destroy(session); |
8020ceb5 | 1375 | } |
457a6b58 | 1376 | |
e58095ef MD |
1377 | /* |
1378 | * Enabler management. | |
1379 | */ | |
d871c65b FD |
1380 | struct lttng_event_enabler *lttng_event_enabler_create( |
1381 | enum lttng_enabler_format_type format_type, | |
e58095ef MD |
1382 | struct lttng_ust_event *event_param, |
1383 | struct lttng_channel *chan) | |
457a6b58 | 1384 | { |
d871c65b | 1385 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1386 | |
d871c65b FD |
1387 | event_enabler = zmalloc(sizeof(*event_enabler)); |
1388 | if (!event_enabler) | |
e58095ef | 1389 | return NULL; |
d871c65b FD |
1390 | event_enabler->base.format_type = format_type; |
1391 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1392 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); | |
1393 | memcpy(&event_enabler->base.event_param, event_param, | |
1394 | sizeof(event_enabler->base.event_param)); | |
1395 | event_enabler->chan = chan; | |
e58095ef | 1396 | /* ctx left NULL */ |
d871c65b FD |
1397 | event_enabler->base.enabled = 0; |
1398 | cds_list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); | |
1399 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1400 | ||
1401 | return event_enabler; | |
457a6b58 MD |
1402 | } |
1403 | ||
d8d2416d FD |
1404 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
1405 | struct lttng_event_notifier_group *event_notifier_group, | |
1406 | enum lttng_enabler_format_type format_type, | |
1407 | struct lttng_ust_event_notifier *event_notifier_param) | |
1408 | { | |
1409 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1410 | ||
1411 | event_notifier_enabler = zmalloc(sizeof(*event_notifier_enabler)); | |
1412 | if (!event_notifier_enabler) | |
1413 | return NULL; | |
1414 | event_notifier_enabler->base.format_type = format_type; | |
1415 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
d37ecb3f | 1416 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
d8d2416d FD |
1417 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.excluder_head); |
1418 | ||
1419 | event_notifier_enabler->user_token = event_notifier_param->event.token; | |
d37ecb3f | 1420 | event_notifier_enabler->num_captures = 0; |
d8d2416d FD |
1421 | |
1422 | memcpy(&event_notifier_enabler->base.event_param.name, | |
1423 | event_notifier_param->event.name, | |
1424 | sizeof(event_notifier_enabler->base.event_param.name)); | |
1425 | event_notifier_enabler->base.event_param.instrumentation = | |
1426 | event_notifier_param->event.instrumentation; | |
1427 | event_notifier_enabler->base.event_param.loglevel = | |
1428 | event_notifier_param->event.loglevel; | |
1429 | event_notifier_enabler->base.event_param.loglevel_type = | |
1430 | event_notifier_param->event.loglevel_type; | |
1431 | ||
1432 | event_notifier_enabler->base.enabled = 0; | |
1433 | event_notifier_enabler->group = event_notifier_group; | |
1434 | ||
1435 | cds_list_add(&event_notifier_enabler->node, | |
1436 | &event_notifier_group->enablers_head); | |
1437 | ||
1438 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1439 | ||
1440 | return event_notifier_enabler; | |
1441 | } | |
1442 | ||
d871c65b | 1443 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1444 | { |
d871c65b FD |
1445 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
1446 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1447 | ||
e58095ef | 1448 | return 0; |
457a6b58 | 1449 | } |
457a6b58 | 1450 | |
d871c65b | 1451 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1452 | { |
d871c65b FD |
1453 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1454 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1455 | ||
e58095ef MD |
1456 | return 0; |
1457 | } | |
457a6b58 | 1458 | |
d871c65b | 1459 | static |
a56fd376 | 1460 | void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
ab249ecf | 1461 | struct lttng_ust_bytecode_node *bytecode) |
e58095ef MD |
1462 | { |
1463 | bytecode->enabler = enabler; | |
1464 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
d871c65b FD |
1465 | } |
1466 | ||
a56fd376 | 1467 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
ab249ecf | 1468 | struct lttng_ust_bytecode_node *bytecode) |
d871c65b | 1469 | { |
a56fd376 | 1470 | _lttng_enabler_attach_filter_bytecode( |
d871c65b FD |
1471 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
1472 | ||
1473 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
e58095ef | 1474 | return 0; |
0bfb5cbd JI |
1475 | } |
1476 | ||
d871c65b FD |
1477 | static |
1478 | void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
0bfb5cbd JI |
1479 | struct lttng_ust_excluder_node *excluder) |
1480 | { | |
1481 | excluder->enabler = enabler; | |
1482 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
d871c65b FD |
1483 | } |
1484 | ||
1485 | int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler, | |
1486 | struct lttng_ust_excluder_node *excluder) | |
1487 | { | |
1488 | _lttng_enabler_attach_exclusion( | |
1489 | lttng_event_enabler_as_enabler(event_enabler), excluder); | |
1490 | ||
1491 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
0bfb5cbd | 1492 | return 0; |
e58095ef | 1493 | } |
f488575f | 1494 | |
d8d2416d FD |
1495 | int lttng_event_notifier_enabler_enable( |
1496 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1497 | { | |
1498 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
1499 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1500 | ||
1501 | return 0; | |
1502 | } | |
1503 | ||
1504 | int lttng_event_notifier_enabler_disable( | |
1505 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1506 | { | |
1507 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
1508 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1509 | ||
1510 | return 0; | |
1511 | } | |
1512 | ||
a56fd376 | 1513 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
d8d2416d | 1514 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
ab249ecf | 1515 | struct lttng_ust_bytecode_node *bytecode) |
d8d2416d | 1516 | { |
a56fd376 | 1517 | _lttng_enabler_attach_filter_bytecode( |
d8d2416d FD |
1518 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
1519 | bytecode); | |
1520 | ||
1521 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1522 | return 0; | |
1523 | } | |
1524 | ||
d37ecb3f FD |
1525 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
1526 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1527 | struct lttng_ust_bytecode_node *bytecode) | |
1528 | { | |
1529 | bytecode->enabler = lttng_event_notifier_enabler_as_enabler( | |
1530 | event_notifier_enabler); | |
1531 | cds_list_add_tail(&bytecode->node, | |
1532 | &event_notifier_enabler->capture_bytecode_head); | |
1533 | event_notifier_enabler->num_captures++; | |
1534 | ||
1535 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1536 | return 0; | |
1537 | } | |
1538 | ||
d8d2416d FD |
1539 | int lttng_event_notifier_enabler_attach_exclusion( |
1540 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1541 | struct lttng_ust_excluder_node *excluder) | |
1542 | { | |
1543 | _lttng_enabler_attach_exclusion( | |
1544 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), | |
1545 | excluder); | |
1546 | ||
1547 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1548 | return 0; | |
1549 | } | |
1550 | ||
e58095ef | 1551 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1552 | union ust_args *uargs, |
e58095ef MD |
1553 | struct lttng_ctx **ctx, struct lttng_session *session) |
1554 | { | |
457a6b58 | 1555 | /* |
e58095ef MD |
1556 | * We cannot attach a context after trace has been started for a |
1557 | * session because the metadata does not allow expressing this | |
1558 | * information outside of the original channel scope. | |
457a6b58 | 1559 | */ |
e58095ef MD |
1560 | if (session->been_active) |
1561 | return -EPERM; | |
457a6b58 | 1562 | |
e58095ef MD |
1563 | switch (context_param->ctx) { |
1564 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1565 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1566 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1567 | { | |
1568 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1569 | ||
1570 | perf_ctx_param = &context_param->u.perf_counter; | |
1571 | return lttng_add_perf_counter_to_ctx( | |
1572 | perf_ctx_param->type, | |
1573 | perf_ctx_param->config, | |
1574 | perf_ctx_param->name, | |
1575 | ctx); | |
1576 | } | |
e58095ef MD |
1577 | case LTTNG_UST_CONTEXT_VTID: |
1578 | return lttng_add_vtid_to_ctx(ctx); | |
1579 | case LTTNG_UST_CONTEXT_VPID: | |
1580 | return lttng_add_vpid_to_ctx(ctx); | |
1581 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1582 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1583 | case LTTNG_UST_CONTEXT_IP: |
1584 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1585 | case LTTNG_UST_CONTEXT_CPU_ID: |
1586 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1587 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1588 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1589 | ctx); | |
735bef47 MJ |
1590 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1591 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1592 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1593 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1594 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1595 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1596 | case LTTNG_UST_CONTEXT_NET_NS: | |
1597 | return lttng_add_net_ns_to_ctx(ctx); | |
1598 | case LTTNG_UST_CONTEXT_PID_NS: | |
1599 | return lttng_add_pid_ns_to_ctx(ctx); | |
cefef7a7 MJ |
1600 | case LTTNG_UST_CONTEXT_TIME_NS: |
1601 | return lttng_add_time_ns_to_ctx(ctx); | |
735bef47 MJ |
1602 | case LTTNG_UST_CONTEXT_USER_NS: |
1603 | return lttng_add_user_ns_to_ctx(ctx); | |
1604 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1605 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1606 | case LTTNG_UST_CONTEXT_VUID: |
1607 | return lttng_add_vuid_to_ctx(ctx); | |
1608 | case LTTNG_UST_CONTEXT_VEUID: | |
1609 | return lttng_add_veuid_to_ctx(ctx); | |
1610 | case LTTNG_UST_CONTEXT_VSUID: | |
1611 | return lttng_add_vsuid_to_ctx(ctx); | |
1612 | case LTTNG_UST_CONTEXT_VGID: | |
1613 | return lttng_add_vgid_to_ctx(ctx); | |
1614 | case LTTNG_UST_CONTEXT_VEGID: | |
1615 | return lttng_add_vegid_to_ctx(ctx); | |
1616 | case LTTNG_UST_CONTEXT_VSGID: | |
1617 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1618 | default: |
1619 | return -EINVAL; | |
457a6b58 | 1620 | } |
457a6b58 MD |
1621 | } |
1622 | ||
d871c65b | 1623 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
e58095ef | 1624 | struct lttng_ust_context *context_param) |
457a6b58 | 1625 | { |
e58095ef | 1626 | return -ENOSYS; |
457a6b58 MD |
1627 | } |
1628 | ||
d871c65b | 1629 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1630 | { |
d871c65b FD |
1631 | if (!event_enabler) { |
1632 | return; | |
0f63324a | 1633 | } |
d871c65b | 1634 | cds_list_del(&event_enabler->node); |
0f63324a | 1635 | |
d871c65b | 1636 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef | 1637 | |
d871c65b FD |
1638 | lttng_destroy_context(event_enabler->ctx); |
1639 | free(event_enabler); | |
457a6b58 MD |
1640 | } |
1641 | ||
e58095ef | 1642 | /* |
d871c65b | 1643 | * lttng_session_sync_event_enablers should be called just before starting a |
e58095ef MD |
1644 | * session. |
1645 | */ | |
457a6b58 | 1646 | static |
d871c65b | 1647 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1648 | { |
d871c65b | 1649 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1650 | struct lttng_event *event; |
457a6b58 | 1651 | |
d871c65b FD |
1652 | cds_list_for_each_entry(event_enabler, &session->enablers_head, node) |
1653 | lttng_event_enabler_ref_events(event_enabler); | |
e58095ef MD |
1654 | /* |
1655 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1656 | * and its channel and session transient states are enabled, we |
1657 | * enable the event, else we disable it. | |
e58095ef MD |
1658 | */ |
1659 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1660 | struct lttng_enabler_ref *enabler_ref; | |
1661 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1662 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1663 | |
1664 | /* Enable events */ | |
1665 | cds_list_for_each_entry(enabler_ref, | |
1666 | &event->enablers_ref_head, node) { | |
1667 | if (enabler_ref->ref->enabled) { | |
1668 | enabled = 1; | |
1669 | break; | |
1670 | } | |
1671 | } | |
ac6b4ac6 MD |
1672 | /* |
1673 | * Enabled state is based on union of enablers, with | |
1674 | * intesection of session and channel transient enable | |
1675 | * states. | |
1676 | */ | |
1677 | enabled = enabled && session->tstate && event->chan->tstate; | |
1678 | ||
1679 | CMM_STORE_SHARED(event->enabled, enabled); | |
1680 | /* | |
1681 | * Sync tracepoint registration with event enabled | |
1682 | * state. | |
1683 | */ | |
1684 | if (enabled) { | |
1685 | if (!event->registered) | |
1686 | register_event(event); | |
1687 | } else { | |
1688 | if (event->registered) | |
1689 | unregister_event(event); | |
1690 | } | |
457a6b58 | 1691 | |
1f49fc05 | 1692 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1693 | cds_list_for_each_entry(enabler_ref, |
1694 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1695 | if (enabler_ref->ref->enabled |
1696 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1697 | has_enablers_without_bytecode = 1; |
1698 | break; | |
1699 | } | |
1700 | } | |
1701 | event->has_enablers_without_bytecode = | |
1702 | has_enablers_without_bytecode; | |
1703 | ||
e58095ef MD |
1704 | /* Enable filters */ |
1705 | cds_list_for_each_entry(runtime, | |
a56fd376 | 1706 | &event->filter_bytecode_runtime_head, node) { |
4d451c15 | 1707 | lttng_bytecode_filter_sync_state(runtime); |
457a6b58 MD |
1708 | } |
1709 | } | |
baa1e0bc | 1710 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1711 | } |
1712 | ||
d8d2416d FD |
1713 | static |
1714 | void lttng_create_event_notifier_if_missing( | |
1715 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1716 | { | |
1717 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1718 | struct lttng_probe_desc *probe_desc; | |
1719 | struct cds_list_head *probe_list; | |
1720 | int i; | |
1721 | ||
1722 | probe_list = lttng_get_probe_list_head(); | |
1723 | ||
1724 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1725 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1726 | int ret; | |
1727 | bool found = false; | |
1728 | const struct lttng_event_desc *desc; | |
1729 | struct lttng_event_notifier *event_notifier; | |
1730 | struct cds_hlist_head *head; | |
1731 | struct cds_hlist_node *node; | |
1732 | ||
1733 | desc = probe_desc->event_desc[i]; | |
d37ecb3f | 1734 | |
d8d2416d FD |
1735 | if (!lttng_desc_match_enabler(desc, |
1736 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1737 | continue; | |
1738 | ||
1739 | /* | |
1740 | * Given the current event_notifier group, get the bucket that | |
1741 | * the target event_notifier would be if it was already | |
1742 | * created. | |
1743 | */ | |
1744 | head = borrow_hash_table_bucket( | |
1745 | event_notifier_group->event_notifiers_ht.table, | |
1746 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
1747 | ||
1748 | cds_hlist_for_each_entry(event_notifier, node, head, hlist) { | |
1749 | /* | |
1750 | * Check if event_notifier already exists by checking | |
1751 | * if the event_notifier and enabler share the same | |
1752 | * description and id. | |
1753 | */ | |
1754 | if (event_notifier->desc == desc && | |
1755 | event_notifier->user_token == event_notifier_enabler->user_token) { | |
1756 | found = true; | |
1757 | break; | |
1758 | } | |
1759 | } | |
1760 | ||
1761 | if (found) | |
1762 | continue; | |
1763 | ||
1764 | /* | |
1765 | * We need to create a event_notifier for this event probe. | |
1766 | */ | |
1767 | ret = lttng_event_notifier_create(desc, | |
1768 | event_notifier_enabler->user_token, | |
1769 | event_notifier_group); | |
1770 | if (ret) { | |
1771 | DBG("Unable to create event_notifier %s, error %d\n", | |
1772 | probe_desc->event_desc[i]->name, ret); | |
1773 | } | |
1774 | } | |
1775 | } | |
1776 | } | |
1777 | ||
1778 | /* | |
1779 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
1780 | */ | |
1781 | static | |
1782 | int lttng_event_notifier_enabler_ref_event_notifiers( | |
1783 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1784 | { | |
1785 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1786 | struct lttng_event_notifier *event_notifier; | |
1787 | ||
1788 | /* | |
1789 | * Only try to create event_notifiers for enablers that are enabled, the user | |
1790 | * might still be attaching filter or exclusion to the | |
1791 | * event_notifier_enabler. | |
1792 | */ | |
1793 | if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled) | |
1794 | goto end; | |
1795 | ||
1796 | /* First, ensure that probe event_notifiers are created for this enabler. */ | |
1797 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
1798 | ||
1799 | /* Link the created event_notifier with its associated enabler. */ | |
1800 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1801 | struct lttng_enabler_ref *enabler_ref; | |
1802 | ||
1803 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
1804 | continue; | |
1805 | ||
1806 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
1807 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1808 | if (!enabler_ref) { | |
1809 | /* | |
1810 | * If no backward ref, create it. | |
1811 | * Add backward ref from event_notifier to enabler. | |
1812 | */ | |
1813 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1814 | if (!enabler_ref) | |
1815 | return -ENOMEM; | |
1816 | ||
1817 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
1818 | event_notifier_enabler); | |
1819 | cds_list_add(&enabler_ref->node, | |
1820 | &event_notifier->enablers_ref_head); | |
1821 | } | |
1822 | ||
1823 | /* | |
1824 | * Link filter bytecodes if not linked yet. | |
1825 | */ | |
1826 | lttng_enabler_link_bytecode(event_notifier->desc, | |
621c07fc FD |
1827 | &event_notifier_group->ctx, |
1828 | &event_notifier->filter_bytecode_runtime_head, | |
1829 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); | |
d37ecb3f FD |
1830 | |
1831 | /* | |
1832 | * Link capture bytecodes if not linked yet. | |
1833 | */ | |
1834 | lttng_enabler_link_bytecode(event_notifier->desc, | |
1835 | &event_notifier_group->ctx, &event_notifier->capture_bytecode_runtime_head, | |
1836 | &event_notifier_enabler->capture_bytecode_head); | |
1837 | ||
1838 | event_notifier->num_captures = event_notifier_enabler->num_captures; | |
d8d2416d FD |
1839 | } |
1840 | end: | |
1841 | return 0; | |
1842 | } | |
1843 | ||
1844 | static | |
1845 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
1846 | { | |
1847 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1848 | struct lttng_event_notifier *event_notifier; | |
1849 | ||
1850 | cds_list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
1851 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
1852 | ||
1853 | /* | |
1854 | * For each event_notifier, if at least one of its enablers is enabled, | |
1855 | * we enable the event_notifier, else we disable it. | |
1856 | */ | |
1857 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1858 | struct lttng_enabler_ref *enabler_ref; | |
1859 | struct lttng_bytecode_runtime *runtime; | |
1860 | int enabled = 0, has_enablers_without_bytecode = 0; | |
1861 | ||
1862 | /* Enable event_notifiers */ | |
1863 | cds_list_for_each_entry(enabler_ref, | |
1864 | &event_notifier->enablers_ref_head, node) { | |
1865 | if (enabler_ref->ref->enabled) { | |
1866 | enabled = 1; | |
1867 | break; | |
1868 | } | |
1869 | } | |
1870 | ||
1871 | CMM_STORE_SHARED(event_notifier->enabled, enabled); | |
1872 | /* | |
1873 | * Sync tracepoint registration with event_notifier enabled | |
1874 | * state. | |
1875 | */ | |
1876 | if (enabled) { | |
1877 | if (!event_notifier->registered) | |
1878 | register_event_notifier(event_notifier); | |
1879 | } else { | |
1880 | if (event_notifier->registered) | |
1881 | unregister_event_notifier(event_notifier); | |
1882 | } | |
1883 | ||
1884 | /* Check if has enablers without bytecode enabled */ | |
1885 | cds_list_for_each_entry(enabler_ref, | |
1886 | &event_notifier->enablers_ref_head, node) { | |
1887 | if (enabler_ref->ref->enabled | |
1888 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1889 | has_enablers_without_bytecode = 1; | |
1890 | break; | |
1891 | } | |
1892 | } | |
1893 | event_notifier->has_enablers_without_bytecode = | |
1894 | has_enablers_without_bytecode; | |
1895 | ||
1896 | /* Enable filters */ | |
1897 | cds_list_for_each_entry(runtime, | |
1898 | &event_notifier->filter_bytecode_runtime_head, node) { | |
4d451c15 | 1899 | lttng_bytecode_filter_sync_state(runtime); |
d8d2416d | 1900 | } |
d37ecb3f FD |
1901 | |
1902 | /* Enable captures. */ | |
1903 | cds_list_for_each_entry(runtime, | |
1904 | &event_notifier->capture_bytecode_runtime_head, node) { | |
1905 | lttng_bytecode_capture_sync_state(runtime); | |
1906 | } | |
d8d2416d FD |
1907 | } |
1908 | __tracepoint_probe_prune_release_queue(); | |
1909 | } | |
1910 | ||
e58095ef MD |
1911 | /* |
1912 | * Apply enablers to session events, adding events to session if need | |
1913 | * be. It is required after each modification applied to an active | |
1914 | * session, and right before session "start". | |
1915 | * "lazy" sync means we only sync if required. | |
1916 | */ | |
1917 | static | |
d871c65b | 1918 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1919 | { |
e58095ef MD |
1920 | /* We can skip if session is not active */ |
1921 | if (!session->active) | |
1922 | return; | |
d871c65b | 1923 | lttng_session_sync_event_enablers(session); |
457a6b58 | 1924 | } |
53569322 MD |
1925 | |
1926 | /* | |
1927 | * Update all sessions with the given app context. | |
1928 | * Called with ust lock held. | |
1929 | * This is invoked when an application context gets loaded/unloaded. It | |
1930 | * ensures the context callbacks are in sync with the application | |
1931 | * context (either app context callbacks, or dummy callbacks). | |
1932 | */ | |
1933 | void lttng_ust_context_set_session_provider(const char *name, | |
1934 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1935 | void (*record)(struct lttng_ctx_field *field, | |
1936 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1937 | struct lttng_channel *chan), | |
1938 | void (*get_value)(struct lttng_ctx_field *field, | |
1939 | struct lttng_ctx_value *value)) | |
1940 | { | |
1941 | struct lttng_session *session; | |
1942 | ||
1943 | cds_list_for_each_entry(session, &sessions, node) { | |
1944 | struct lttng_channel *chan; | |
1945 | struct lttng_event *event; | |
1946 | int ret; | |
1947 | ||
1948 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1949 | name, get_size, record, get_value); | |
1950 | if (ret) | |
1951 | abort(); | |
1952 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1953 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1954 | name, get_size, record, get_value); | |
1955 | if (ret) | |
1956 | abort(); | |
1957 | } | |
1958 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1959 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1960 | name, get_size, record, get_value); | |
1961 | if (ret) | |
1962 | abort(); | |
1963 | } | |
1964 | } | |
1965 | } | |
d8d2416d FD |
1966 | |
1967 | /* | |
1968 | * Update all event_notifier groups with the given app context. | |
1969 | * Called with ust lock held. | |
1970 | * This is invoked when an application context gets loaded/unloaded. It | |
1971 | * ensures the context callbacks are in sync with the application | |
1972 | * context (either app context callbacks, or dummy callbacks). | |
1973 | */ | |
1974 | void lttng_ust_context_set_event_notifier_group_provider(const char *name, | |
1975 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1976 | void (*record)(struct lttng_ctx_field *field, | |
1977 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1978 | struct lttng_channel *chan), | |
1979 | void (*get_value)(struct lttng_ctx_field *field, | |
1980 | struct lttng_ctx_value *value)) | |
1981 | { | |
1982 | struct lttng_event_notifier_group *event_notifier_group; | |
1983 | ||
1984 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1985 | int ret; | |
1986 | ||
1987 | ret = lttng_ust_context_set_provider_rcu( | |
1988 | &event_notifier_group->ctx, | |
1989 | name, get_size, record, get_value); | |
1990 | if (ret) | |
1991 | abort(); | |
1992 | } | |
1993 | } |