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> |
10544ee8 | 37 | #include <dlfcn.h> |
2ae57758 | 38 | #include <lttng/ust-endian.h> |
44c72f10 | 39 | |
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 | ||
7dd08bec | 146 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 147 | { |
7dd08bec | 148 | struct lttng_session *session; |
74d81a6c | 149 | int i; |
8020ceb5 | 150 | |
7dd08bec | 151 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
152 | if (!session) |
153 | return NULL; | |
51f804ec | 154 | if (lttng_context_init_all(&session->ctx)) { |
53569322 MD |
155 | free(session); |
156 | return NULL; | |
157 | } | |
e58095ef MD |
158 | CDS_INIT_LIST_HEAD(&session->chan_head); |
159 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 160 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 161 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
162 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
163 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
164 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
165 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 166 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
167 | return session; |
168 | } | |
169 | ||
ebabbf58 MD |
170 | struct lttng_counter *lttng_ust_counter_create( |
171 | const char *counter_transport_name, | |
172 | size_t number_dimensions, const struct lttng_counter_dimension *dimensions) | |
173 | { | |
174 | struct lttng_counter_transport *counter_transport = NULL; | |
175 | struct lttng_counter *counter = NULL; | |
176 | ||
177 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
178 | if (!counter_transport) | |
179 | goto notransport; | |
180 | counter = zmalloc(sizeof(struct lttng_counter)); | |
181 | if (!counter) | |
182 | goto nomem; | |
183 | ||
184 | counter->ops = &counter_transport->ops; | |
185 | counter->transport = counter_transport; | |
186 | ||
187 | counter->counter = counter->ops->counter_create( | |
188 | number_dimensions, dimensions, 0, | |
189 | -1, 0, NULL, false); | |
190 | if (!counter->counter) { | |
191 | goto create_error; | |
192 | } | |
193 | ||
194 | return counter; | |
195 | ||
196 | create_error: | |
197 | free(counter); | |
198 | nomem: | |
199 | notransport: | |
200 | return NULL; | |
201 | } | |
202 | ||
203 | static | |
204 | void lttng_ust_counter_destroy(struct lttng_counter *counter) | |
205 | { | |
206 | counter->ops->counter_destroy(counter->counter); | |
207 | free(counter); | |
208 | } | |
209 | ||
d8d2416d FD |
210 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
211 | { | |
212 | struct lttng_event_notifier_group *event_notifier_group; | |
213 | int i; | |
214 | ||
215 | event_notifier_group = zmalloc(sizeof(struct lttng_event_notifier_group)); | |
216 | if (!event_notifier_group) | |
217 | return NULL; | |
218 | ||
51f804ec FD |
219 | /* Add all contexts. */ |
220 | if (lttng_context_init_all(&event_notifier_group->ctx)) { | |
221 | free(event_notifier_group); | |
222 | return NULL; | |
223 | } | |
224 | ||
d8d2416d FD |
225 | CDS_INIT_LIST_HEAD(&event_notifier_group->enablers_head); |
226 | CDS_INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
227 | for (i = 0; i < LTTNG_UST_EVENT_NOTIFIER_HT_SIZE; i++) | |
228 | CDS_INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
229 | ||
230 | cds_list_add(&event_notifier_group->node, &event_notifier_groups); | |
231 | ||
232 | return event_notifier_group; | |
233 | } | |
234 | ||
74d81a6c MD |
235 | /* |
236 | * Only used internally at session destruction. | |
237 | */ | |
238 | static | |
239 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
240 | { | |
241 | struct channel *chan; | |
242 | struct lttng_ust_shm_handle *handle; | |
243 | ||
244 | cds_list_del(<tng_chan->node); | |
245 | lttng_destroy_context(lttng_chan->ctx); | |
246 | chan = lttng_chan->chan; | |
247 | handle = lttng_chan->handle; | |
248 | /* | |
249 | * note: lttng_chan is private data contained within handle. It | |
250 | * will be freed along with the handle. | |
251 | */ | |
252 | channel_destroy(chan, handle, 0); | |
253 | } | |
254 | ||
ac6b4ac6 MD |
255 | static |
256 | void register_event(struct lttng_event *event) | |
257 | { | |
258 | int ret; | |
259 | const struct lttng_event_desc *desc; | |
260 | ||
261 | assert(event->registered == 0); | |
262 | desc = event->desc; | |
baa1e0bc | 263 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
264 | desc->probe_callback, |
265 | event, desc->signature); | |
266 | WARN_ON_ONCE(ret); | |
267 | if (!ret) | |
268 | event->registered = 1; | |
269 | } | |
270 | ||
d8d2416d FD |
271 | static |
272 | void register_event_notifier(struct lttng_event_notifier *event_notifier) | |
273 | { | |
274 | int ret; | |
275 | const struct lttng_event_desc *desc; | |
276 | ||
277 | assert(event_notifier->registered == 0); | |
278 | desc = event_notifier->desc; | |
279 | ret = __tracepoint_probe_register_queue_release(desc->name, | |
280 | desc->u.ext.event_notifier_callback, event_notifier, desc->signature); | |
281 | WARN_ON_ONCE(ret); | |
282 | if (!ret) | |
283 | event_notifier->registered = 1; | |
284 | } | |
285 | ||
ac6b4ac6 MD |
286 | static |
287 | void unregister_event(struct lttng_event *event) | |
288 | { | |
289 | int ret; | |
290 | const struct lttng_event_desc *desc; | |
291 | ||
292 | assert(event->registered == 1); | |
293 | desc = event->desc; | |
baa1e0bc | 294 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
295 | desc->probe_callback, |
296 | event); | |
297 | WARN_ON_ONCE(ret); | |
298 | if (!ret) | |
299 | event->registered = 0; | |
300 | } | |
301 | ||
d8d2416d FD |
302 | static |
303 | void unregister_event_notifier(struct lttng_event_notifier *event_notifier) | |
304 | { | |
305 | int ret; | |
306 | const struct lttng_event_desc *desc; | |
307 | ||
308 | assert(event_notifier->registered == 1); | |
309 | desc = event_notifier->desc; | |
310 | ret = __tracepoint_probe_unregister_queue_release(desc->name, | |
311 | desc->u.ext.event_notifier_callback, event_notifier); | |
312 | WARN_ON_ONCE(ret); | |
313 | if (!ret) | |
314 | event_notifier->registered = 0; | |
315 | } | |
316 | ||
ac6b4ac6 MD |
317 | /* |
318 | * Only used internally at session destruction. | |
319 | */ | |
320 | static | |
321 | void _lttng_event_unregister(struct lttng_event *event) | |
322 | { | |
323 | if (event->registered) | |
324 | unregister_event(event); | |
325 | } | |
326 | ||
d8d2416d FD |
327 | /* |
328 | * Only used internally at session destruction. | |
329 | */ | |
330 | static | |
331 | void _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier) | |
332 | { | |
333 | if (event_notifier->registered) | |
334 | unregister_event_notifier(event_notifier); | |
335 | } | |
336 | ||
7dd08bec | 337 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 338 | { |
7dd08bec MD |
339 | struct lttng_channel *chan, *tmpchan; |
340 | struct lttng_event *event, *tmpevent; | |
c785c634 | 341 | struct lttng_enum *_enum, *tmp_enum; |
d871c65b | 342 | struct lttng_event_enabler *event_enabler, *event_tmpenabler; |
8020ceb5 | 343 | |
b5234c06 | 344 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 345 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 346 | _lttng_event_unregister(event); |
8020ceb5 | 347 | } |
10544ee8 | 348 | lttng_ust_synchronize_trace(); /* Wait for in-flight events to complete */ |
baa1e0bc | 349 | __tracepoint_probe_prune_release_queue(); |
d871c65b | 350 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
e58095ef | 351 | &session->enablers_head, node) |
d871c65b | 352 | lttng_event_enabler_destroy(event_enabler); |
e58095ef MD |
353 | cds_list_for_each_entry_safe(event, tmpevent, |
354 | &session->events_head, node) | |
7dd08bec | 355 | _lttng_event_destroy(event); |
c785c634 MD |
356 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
357 | &session->enums_head, node) | |
358 | _lttng_enum_destroy(_enum); | |
e58095ef | 359 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 360 | _lttng_channel_unmap(chan); |
e58095ef | 361 | cds_list_del(&session->node); |
53569322 | 362 | lttng_destroy_context(session->ctx); |
b5234c06 | 363 | free(session); |
8020ceb5 MD |
364 | } |
365 | ||
d8d2416d FD |
366 | void lttng_event_notifier_group_destroy( |
367 | struct lttng_event_notifier_group *event_notifier_group) | |
368 | { | |
369 | int close_ret; | |
370 | struct lttng_event_notifier_enabler *notifier_enabler, *tmpnotifier_enabler; | |
371 | struct lttng_event_notifier *notifier, *tmpnotifier; | |
372 | ||
373 | if (!event_notifier_group) { | |
374 | return; | |
375 | } | |
376 | ||
377 | cds_list_for_each_entry(notifier, | |
378 | &event_notifier_group->event_notifiers_head, node) | |
379 | _lttng_event_notifier_unregister(notifier); | |
380 | ||
10544ee8 | 381 | lttng_ust_synchronize_trace(); |
d8d2416d FD |
382 | |
383 | cds_list_for_each_entry_safe(notifier_enabler, tmpnotifier_enabler, | |
384 | &event_notifier_group->enablers_head, node) | |
385 | lttng_event_notifier_enabler_destroy(notifier_enabler); | |
386 | ||
387 | cds_list_for_each_entry_safe(notifier, tmpnotifier, | |
388 | &event_notifier_group->event_notifiers_head, node) | |
389 | _lttng_event_notifier_destroy(notifier); | |
390 | ||
ebabbf58 MD |
391 | if (event_notifier_group->error_counter) |
392 | lttng_ust_counter_destroy(event_notifier_group->error_counter); | |
393 | ||
394 | /* Close the notification fd to the listener of event_notifiers. */ | |
d8d2416d FD |
395 | |
396 | lttng_ust_lock_fd_tracker(); | |
397 | close_ret = close(event_notifier_group->notification_fd); | |
398 | if (!close_ret) { | |
399 | lttng_ust_delete_fd_from_tracker( | |
400 | event_notifier_group->notification_fd); | |
401 | } else { | |
402 | PERROR("close"); | |
403 | abort(); | |
404 | } | |
405 | lttng_ust_unlock_fd_tracker(); | |
406 | ||
407 | cds_list_del(&event_notifier_group->node); | |
408 | ||
409 | free(event_notifier_group); | |
410 | } | |
411 | ||
d871c65b FD |
412 | static |
413 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
414 | { | |
ab249ecf | 415 | struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node; |
d871c65b FD |
416 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
417 | ||
418 | if (!enabler) { | |
419 | return; | |
420 | } | |
421 | ||
422 | /* Destroy filter bytecode */ | |
423 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
424 | &enabler->filter_bytecode_head, node) { | |
425 | free(filter_node); | |
426 | } | |
427 | ||
428 | /* Destroy excluders */ | |
429 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
430 | &enabler->excluder_head, node) { | |
431 | free(excluder_node); | |
432 | } | |
433 | } | |
434 | ||
d8d2416d FD |
435 | void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler) |
436 | { | |
437 | if (!event_notifier_enabler) { | |
438 | return; | |
439 | } | |
440 | ||
441 | cds_list_del(&event_notifier_enabler->node); | |
442 | ||
443 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
444 | ||
445 | free(event_notifier_enabler); | |
446 | } | |
447 | ||
53569322 MD |
448 | static |
449 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
450 | struct lttng_session *session) | |
451 | { | |
452 | const char *enum_name = desc->name; | |
453 | struct lttng_enum *_enum; | |
454 | struct cds_hlist_head *head; | |
53569322 MD |
455 | int ret = 0; |
456 | size_t name_len = strlen(enum_name); | |
457 | uint32_t hash; | |
458 | int notify_socket; | |
459 | ||
b33b46f7 | 460 | /* Check if this enum is already registered for this session. */ |
53569322 MD |
461 | hash = jhash(enum_name, name_len, 0); |
462 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
b33b46f7 FD |
463 | |
464 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
465 | if (_enum) { | |
466 | ret = -EEXIST; | |
467 | goto exist; | |
53569322 MD |
468 | } |
469 | ||
470 | notify_socket = lttng_get_notify_socket(session->owner); | |
471 | if (notify_socket < 0) { | |
472 | ret = notify_socket; | |
473 | goto socket_error; | |
474 | } | |
475 | ||
476 | _enum = zmalloc(sizeof(*_enum)); | |
477 | if (!_enum) { | |
478 | ret = -ENOMEM; | |
479 | goto cache_error; | |
480 | } | |
481 | _enum->session = session; | |
482 | _enum->desc = desc; | |
483 | ||
484 | ret = ustcomm_register_enum(notify_socket, | |
485 | session->objd, | |
486 | enum_name, | |
487 | desc->nr_entries, | |
488 | desc->entries, | |
489 | &_enum->id); | |
490 | if (ret < 0) { | |
491 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
492 | goto sessiond_register_error; | |
493 | } | |
494 | cds_list_add(&_enum->node, &session->enums_head); | |
495 | cds_hlist_add_head(&_enum->hlist, head); | |
496 | return 0; | |
497 | ||
498 | sessiond_register_error: | |
499 | free(_enum); | |
500 | cache_error: | |
501 | socket_error: | |
502 | exist: | |
503 | return ret; | |
504 | } | |
505 | ||
506 | static | |
507 | int lttng_create_enum_check(const struct lttng_type *type, | |
508 | struct lttng_session *session) | |
509 | { | |
510 | switch (type->atype) { | |
511 | case atype_enum: | |
512 | { | |
513 | const struct lttng_enum_desc *enum_desc; | |
514 | int ret; | |
515 | ||
218deb69 MD |
516 | enum_desc = type->u.legacy.basic.enumeration.desc; |
517 | ret = lttng_enum_create(enum_desc, session); | |
518 | if (ret && ret != -EEXIST) { | |
519 | DBG("Unable to create enum error: (%d)", ret); | |
520 | return ret; | |
521 | } | |
522 | break; | |
523 | } | |
524 | case atype_enum_nestable: | |
525 | { | |
526 | const struct lttng_enum_desc *enum_desc; | |
527 | int ret; | |
528 | ||
529 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
530 | ret = lttng_enum_create(enum_desc, session); |
531 | if (ret && ret != -EEXIST) { | |
532 | DBG("Unable to create enum error: (%d)", ret); | |
533 | return ret; | |
534 | } | |
535 | break; | |
536 | } | |
537 | case atype_dynamic: | |
538 | { | |
539 | const struct lttng_event_field *tag_field_generic; | |
540 | const struct lttng_enum_desc *enum_desc; | |
541 | int ret; | |
542 | ||
543 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 544 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
545 | ret = lttng_enum_create(enum_desc, session); |
546 | if (ret && ret != -EEXIST) { | |
547 | DBG("Unable to create enum error: (%d)", ret); | |
548 | return ret; | |
549 | } | |
550 | break; | |
551 | } | |
552 | default: | |
553 | /* TODO: nested types when they become supported. */ | |
554 | break; | |
555 | } | |
556 | return 0; | |
557 | } | |
558 | ||
559 | static | |
560 | int lttng_create_all_event_enums(size_t nr_fields, | |
561 | const struct lttng_event_field *event_fields, | |
562 | struct lttng_session *session) | |
563 | { | |
564 | size_t i; | |
565 | int ret; | |
566 | ||
567 | /* For each field, ensure enum is part of the session. */ | |
568 | for (i = 0; i < nr_fields; i++) { | |
569 | const struct lttng_type *type = &event_fields[i].type; | |
570 | ||
571 | ret = lttng_create_enum_check(type, session); | |
572 | if (ret) | |
573 | return ret; | |
574 | } | |
575 | return 0; | |
576 | } | |
577 | ||
578 | static | |
579 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
580 | const struct lttng_ctx_field *ctx_fields, | |
581 | struct lttng_session *session) | |
582 | { | |
583 | size_t i; | |
584 | int ret; | |
585 | ||
586 | /* For each field, ensure enum is part of the session. */ | |
587 | for (i = 0; i < nr_fields; i++) { | |
588 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
589 | ||
590 | ret = lttng_create_enum_check(type, session); | |
591 | if (ret) | |
592 | return ret; | |
593 | } | |
594 | return 0; | |
595 | } | |
596 | ||
710b8ee3 MD |
597 | /* |
598 | * Ensure that a state-dump will be performed for this session at the end | |
599 | * of the current handle_message(). | |
600 | */ | |
601 | int lttng_session_statedump(struct lttng_session *session) | |
602 | { | |
603 | session->statedump_pending = 1; | |
604 | lttng_ust_sockinfo_session_enabled(session->owner); | |
605 | return 0; | |
606 | } | |
53569322 | 607 | |
7dd08bec | 608 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
609 | { |
610 | int ret = 0; | |
7dd08bec | 611 | struct lttng_channel *chan; |
32ce8569 | 612 | int notify_socket; |
8020ceb5 | 613 | |
8020ceb5 MD |
614 | if (session->active) { |
615 | ret = -EBUSY; | |
616 | goto end; | |
617 | } | |
618 | ||
32ce8569 MD |
619 | notify_socket = lttng_get_notify_socket(session->owner); |
620 | if (notify_socket < 0) | |
621 | return notify_socket; | |
622 | ||
ac6b4ac6 MD |
623 | /* Set transient enabler state to "enabled" */ |
624 | session->tstate = 1; | |
e58095ef | 625 | |
3ff7660f | 626 | /* We need to sync enablers with session before activation. */ |
d871c65b | 627 | lttng_session_sync_event_enablers(session); |
3ff7660f | 628 | |
8020ceb5 MD |
629 | /* |
630 | * Snapshot the number of events per channel to know the type of header | |
631 | * we need to use. | |
632 | */ | |
e58095ef | 633 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 634 | const struct lttng_ctx *ctx; |
83e43212 | 635 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 636 | size_t nr_fields = 0; |
6ca18e66 | 637 | uint32_t chan_id; |
32ce8569 MD |
638 | |
639 | /* don't change it if session stop/restart */ | |
8020ceb5 | 640 | if (chan->header_type) |
32ce8569 MD |
641 | continue; |
642 | ctx = chan->ctx; | |
643 | if (ctx) { | |
644 | nr_fields = ctx->nr_fields; | |
83e43212 | 645 | fields = ctx->fields; |
53569322 MD |
646 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
647 | session); | |
648 | if (ret < 0) { | |
649 | DBG("Error (%d) adding enum to session", ret); | |
650 | return ret; | |
651 | } | |
32ce8569 MD |
652 | } |
653 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 654 | session, |
32ce8569 MD |
655 | session->objd, |
656 | chan->objd, | |
657 | nr_fields, | |
658 | fields, | |
6ca18e66 | 659 | &chan_id, |
32ce8569 | 660 | &chan->header_type); |
b869b5ae MD |
661 | if (ret) { |
662 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 663 | return ret; |
b869b5ae | 664 | } |
6ca18e66 MD |
665 | if (chan_id != chan->id) { |
666 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
667 | chan_id, chan->id); | |
668 | return -EINVAL; | |
669 | } | |
8020ceb5 MD |
670 | } |
671 | ||
ac6b4ac6 | 672 | /* Set atomically the state to "active" */ |
b5234c06 MD |
673 | CMM_ACCESS_ONCE(session->active) = 1; |
674 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 675 | |
710b8ee3 MD |
676 | ret = lttng_session_statedump(session); |
677 | if (ret) | |
678 | return ret; | |
8020ceb5 | 679 | end: |
8020ceb5 MD |
680 | return ret; |
681 | } | |
682 | ||
7dd08bec | 683 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
684 | { |
685 | int ret = 0; | |
686 | ||
8020ceb5 MD |
687 | if (!session->active) { |
688 | ret = -EBUSY; | |
689 | goto end; | |
690 | } | |
ac6b4ac6 | 691 | /* Set atomically the state to "inactive" */ |
b5234c06 | 692 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
693 | |
694 | /* Set transient enabler state to "disabled" */ | |
695 | session->tstate = 0; | |
d871c65b | 696 | lttng_session_sync_event_enablers(session); |
8020ceb5 | 697 | end: |
8020ceb5 MD |
698 | return ret; |
699 | } | |
700 | ||
7dd08bec | 701 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 702 | { |
ac6b4ac6 | 703 | int ret = 0; |
976fe9ea | 704 | |
ac6b4ac6 MD |
705 | if (channel->enabled) { |
706 | ret = -EBUSY; | |
707 | goto end; | |
708 | } | |
709 | /* Set transient enabler state to "enabled" */ | |
710 | channel->tstate = 1; | |
d871c65b | 711 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
712 | /* Set atomically the state to "enabled" */ |
713 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
714 | end: | |
715 | return ret; | |
976fe9ea MD |
716 | } |
717 | ||
7dd08bec | 718 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 719 | { |
ac6b4ac6 | 720 | int ret = 0; |
976fe9ea | 721 | |
ac6b4ac6 MD |
722 | if (!channel->enabled) { |
723 | ret = -EBUSY; | |
724 | goto end; | |
725 | } | |
726 | /* Set atomically the state to "disabled" */ | |
727 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
728 | /* Set transient enabler state to "enabled" */ | |
729 | channel->tstate = 0; | |
d871c65b | 730 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
731 | end: |
732 | return ret; | |
976fe9ea MD |
733 | } |
734 | ||
fb470188 FD |
735 | static inline |
736 | struct cds_hlist_head *borrow_hash_table_bucket( | |
737 | struct cds_hlist_head *hash_table, | |
738 | unsigned int hash_table_size, | |
739 | const struct lttng_event_desc *desc) | |
740 | { | |
741 | const char *event_name; | |
742 | size_t name_len; | |
743 | uint32_t hash; | |
744 | ||
745 | event_name = desc->name; | |
746 | name_len = strlen(event_name); | |
747 | ||
748 | hash = jhash(event_name, name_len, 0); | |
749 | return &hash_table[hash & (hash_table_size - 1)]; | |
750 | } | |
751 | ||
8020ceb5 MD |
752 | /* |
753 | * Supports event creation while tracing session is active. | |
754 | */ | |
e58095ef MD |
755 | static |
756 | int lttng_event_create(const struct lttng_event_desc *desc, | |
757 | struct lttng_channel *chan) | |
8020ceb5 | 758 | { |
7dd08bec | 759 | struct lttng_event *event; |
32ce8569 | 760 | struct lttng_session *session = chan->session; |
d56fa719 | 761 | struct cds_hlist_head *head; |
576599a0 | 762 | int ret = 0; |
32ce8569 MD |
763 | int notify_socket, loglevel; |
764 | const char *uri; | |
8020ceb5 | 765 | |
fb470188 FD |
766 | head = borrow_hash_table_bucket(chan->session->events_ht.table, |
767 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
457a6b58 | 768 | |
32ce8569 MD |
769 | notify_socket = lttng_get_notify_socket(session->owner); |
770 | if (notify_socket < 0) { | |
771 | ret = notify_socket; | |
772 | goto socket_error; | |
773 | } | |
774 | ||
53569322 MD |
775 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
776 | session); | |
c785c634 MD |
777 | if (ret < 0) { |
778 | DBG("Error (%d) adding enum to session", ret); | |
779 | goto create_enum_error; | |
780 | } | |
781 | ||
457a6b58 MD |
782 | /* |
783 | * Check if loglevel match. Refuse to connect event if not. | |
784 | */ | |
7dd08bec | 785 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
786 | if (!event) { |
787 | ret = -ENOMEM; | |
8020ceb5 | 788 | goto cache_error; |
576599a0 | 789 | } |
8020ceb5 | 790 | event->chan = chan; |
e58095ef | 791 | |
ac6b4ac6 MD |
792 | /* Event will be enabled by enabler sync. */ |
793 | event->enabled = 0; | |
794 | event->registered = 0; | |
a56fd376 | 795 | CDS_INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
e58095ef MD |
796 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); |
797 | event->desc = desc; | |
32ce8569 MD |
798 | |
799 | if (desc->loglevel) | |
800 | loglevel = *(*event->desc->loglevel); | |
801 | else | |
802 | loglevel = TRACE_DEFAULT; | |
803 | if (desc->u.ext.model_emf_uri) | |
804 | uri = *(desc->u.ext.model_emf_uri); | |
805 | else | |
806 | uri = NULL; | |
807 | ||
13b21cd6 MD |
808 | /* Fetch event ID from sessiond */ |
809 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 810 | session, |
13b21cd6 MD |
811 | session->objd, |
812 | chan->objd, | |
fb470188 | 813 | desc->name, |
13b21cd6 MD |
814 | loglevel, |
815 | desc->signature, | |
816 | desc->nr_fields, | |
817 | desc->fields, | |
818 | uri, | |
819 | &event->id); | |
820 | if (ret < 0) { | |
821 | DBG("Error (%d) registering event to sessiond", ret); | |
822 | goto sessiond_register_error; | |
32ce8569 | 823 | } |
2b213b16 | 824 | |
e58095ef | 825 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 826 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 827 | return 0; |
8020ceb5 | 828 | |
32ce8569 | 829 | sessiond_register_error: |
b5234c06 | 830 | free(event); |
8020ceb5 | 831 | cache_error: |
c785c634 | 832 | create_enum_error: |
32ce8569 | 833 | socket_error: |
576599a0 | 834 | return ret; |
8020ceb5 MD |
835 | } |
836 | ||
d8d2416d FD |
837 | static |
838 | int lttng_event_notifier_create(const struct lttng_event_desc *desc, | |
6566528b | 839 | uint64_t token, uint64_t error_counter_index, |
d8d2416d FD |
840 | struct lttng_event_notifier_group *event_notifier_group) |
841 | { | |
842 | struct lttng_event_notifier *event_notifier; | |
843 | struct cds_hlist_head *head; | |
844 | int ret = 0; | |
845 | ||
846 | /* | |
847 | * Get the hashtable bucket the created lttng_event_notifier object | |
848 | * should be inserted. | |
849 | */ | |
850 | head = borrow_hash_table_bucket( | |
851 | event_notifier_group->event_notifiers_ht.table, | |
852 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
853 | ||
854 | event_notifier = zmalloc(sizeof(struct lttng_event_notifier)); | |
855 | if (!event_notifier) { | |
856 | ret = -ENOMEM; | |
857 | goto error; | |
858 | } | |
859 | ||
860 | event_notifier->group = event_notifier_group; | |
861 | event_notifier->user_token = token; | |
6566528b | 862 | event_notifier->error_counter_index = error_counter_index; |
d8d2416d FD |
863 | |
864 | /* Event notifier will be enabled by enabler sync. */ | |
865 | event_notifier->enabled = 0; | |
866 | event_notifier->registered = 0; | |
867 | ||
868 | CDS_INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); | |
d37ecb3f | 869 | CDS_INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head); |
d8d2416d FD |
870 | CDS_INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
871 | event_notifier->desc = desc; | |
872 | ||
873 | cds_list_add(&event_notifier->node, | |
874 | &event_notifier_group->event_notifiers_head); | |
875 | cds_hlist_add_head(&event_notifier->hlist, head); | |
876 | ||
877 | return 0; | |
878 | ||
879 | error: | |
880 | return ret; | |
881 | } | |
882 | ||
883 | static | |
884 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
885 | { | |
886 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
887 | ||
888 | /* Remove from event_notifier list. */ | |
889 | cds_list_del(&event_notifier->node); | |
890 | /* Remove from event_notifier hash table. */ | |
891 | cds_hlist_del(&event_notifier->hlist); | |
892 | ||
893 | lttng_free_event_notifier_filter_runtime(event_notifier); | |
894 | ||
895 | /* Free event_notifier enabler refs */ | |
896 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
897 | &event_notifier->enablers_ref_head, node) | |
898 | free(enabler_ref); | |
899 | free(event_notifier); | |
900 | } | |
901 | ||
e58095ef | 902 | static |
196ec2df | 903 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
904 | struct lttng_enabler *enabler) |
905 | { | |
906 | int loglevel = 0; | |
7e2e405c | 907 | unsigned int has_loglevel = 0; |
e58095ef | 908 | |
e450e339 | 909 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f6f42e6 MD |
910 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
911 | desc->name, SIZE_MAX)) | |
e58095ef MD |
912 | return 0; |
913 | if (desc->loglevel) { | |
914 | loglevel = *(*desc->loglevel); | |
915 | has_loglevel = 1; | |
916 | } | |
917 | if (!lttng_loglevel_match(loglevel, | |
918 | has_loglevel, | |
919 | enabler->event_param.loglevel_type, | |
920 | enabler->event_param.loglevel)) | |
921 | return 0; | |
922 | return 1; | |
923 | } | |
924 | ||
925 | static | |
926 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
927 | struct lttng_enabler *enabler) | |
928 | { | |
929 | int loglevel = 0; | |
930 | unsigned int has_loglevel = 0; | |
931 | ||
e450e339 | 932 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
e58095ef MD |
933 | if (strcmp(desc->name, enabler->event_param.name)) |
934 | return 0; | |
935 | if (desc->loglevel) { | |
936 | loglevel = *(*desc->loglevel); | |
937 | has_loglevel = 1; | |
938 | } | |
939 | if (!lttng_loglevel_match(loglevel, | |
940 | has_loglevel, | |
941 | enabler->event_param.loglevel_type, | |
942 | enabler->event_param.loglevel)) | |
943 | return 0; | |
944 | return 1; | |
945 | } | |
946 | ||
947 | static | |
948 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
949 | struct lttng_enabler *enabler) | |
950 | { | |
e450e339 FD |
951 | switch (enabler->format_type) { |
952 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
196ec2df PP |
953 | { |
954 | struct lttng_ust_excluder_node *excluder; | |
955 | ||
956 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
957 | return 0; | |
958 | } | |
959 | ||
960 | /* | |
961 | * If the matching event matches with an excluder, | |
962 | * return 'does not match' | |
963 | */ | |
964 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
965 | int count; | |
966 | ||
967 | for (count = 0; count < excluder->excluder.count; count++) { | |
968 | int len; | |
969 | char *excluder_name; | |
970 | ||
971 | excluder_name = (char *) (excluder->excluder.names) | |
972 | + count * LTTNG_UST_SYM_NAME_LEN; | |
973 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 974 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 975 | return 0; |
ed5b5bbd JI |
976 | } |
977 | } | |
196ec2df | 978 | return 1; |
ed5b5bbd | 979 | } |
e450e339 | 980 | case LTTNG_ENABLER_FORMAT_EVENT: |
e58095ef MD |
981 | return lttng_desc_match_event_enabler(desc, enabler); |
982 | default: | |
983 | return -EINVAL; | |
984 | } | |
985 | } | |
986 | ||
987 | static | |
d871c65b FD |
988 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
989 | struct lttng_event *event) | |
e58095ef | 990 | { |
d871c65b FD |
991 | if (lttng_desc_match_enabler(event->desc, |
992 | lttng_event_enabler_as_enabler(event_enabler)) | |
993 | && event->chan == event_enabler->chan) | |
d970f72e MD |
994 | return 1; |
995 | else | |
996 | return 0; | |
e58095ef MD |
997 | } |
998 | ||
d8d2416d FD |
999 | static |
1000 | int lttng_event_notifier_enabler_match_event_notifier( | |
1001 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1002 | struct lttng_event_notifier *event_notifier) | |
1003 | { | |
1004 | int desc_matches = lttng_desc_match_enabler(event_notifier->desc, | |
1005 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1006 | ||
1007 | if (desc_matches && event_notifier->group == event_notifier_enabler->group && | |
1008 | event_notifier->user_token == event_notifier_enabler->user_token) | |
1009 | return 1; | |
1010 | else | |
1011 | return 0; | |
1012 | } | |
1013 | ||
e58095ef | 1014 | static |
d871c65b FD |
1015 | struct lttng_enabler_ref *lttng_enabler_ref( |
1016 | struct cds_list_head *enabler_ref_list, | |
e58095ef MD |
1017 | struct lttng_enabler *enabler) |
1018 | { | |
1019 | struct lttng_enabler_ref *enabler_ref; | |
1020 | ||
d871c65b | 1021 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
e58095ef MD |
1022 | if (enabler_ref->ref == enabler) |
1023 | return enabler_ref; | |
1024 | } | |
1025 | return NULL; | |
1026 | } | |
1027 | ||
8020ceb5 | 1028 | /* |
e58095ef MD |
1029 | * Create struct lttng_event if it is missing and present in the list of |
1030 | * tracepoint probes. | |
8020ceb5 | 1031 | */ |
e58095ef | 1032 | static |
d871c65b | 1033 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1034 | { |
d871c65b | 1035 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1036 | struct lttng_probe_desc *probe_desc; |
1037 | const struct lttng_event_desc *desc; | |
1038 | struct lttng_event *event; | |
1039 | int i; | |
1040 | struct cds_list_head *probe_list; | |
1041 | ||
1042 | probe_list = lttng_get_probe_list_head(); | |
1043 | /* | |
1044 | * For each probe event, if we find that a probe event matches | |
1045 | * our enabler, create an associated lttng_event if not | |
1046 | * already present. | |
1047 | */ | |
1048 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1049 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
1050 | int ret; |
1051 | bool found = false; | |
d56fa719 MD |
1052 | struct cds_hlist_head *head; |
1053 | struct cds_hlist_node *node; | |
e58095ef MD |
1054 | |
1055 | desc = probe_desc->event_desc[i]; | |
d871c65b FD |
1056 | if (!lttng_desc_match_enabler(desc, |
1057 | lttng_event_enabler_as_enabler(event_enabler))) | |
e58095ef MD |
1058 | continue; |
1059 | ||
fb470188 FD |
1060 | head = borrow_hash_table_bucket( |
1061 | session->events_ht.table, | |
1062 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
1063 | ||
d56fa719 | 1064 | cds_hlist_for_each_entry(event, node, head, hlist) { |
d970f72e | 1065 | if (event->desc == desc |
d871c65b | 1066 | && event->chan == event_enabler->chan) { |
98a97f24 | 1067 | found = true; |
3140bffe FD |
1068 | break; |
1069 | } | |
e58095ef MD |
1070 | } |
1071 | if (found) | |
1072 | continue; | |
1073 | ||
1074 | /* | |
1075 | * We need to create an event for this | |
1076 | * event probe. | |
1077 | */ | |
1078 | ret = lttng_event_create(probe_desc->event_desc[i], | |
d871c65b | 1079 | event_enabler->chan); |
e58095ef | 1080 | if (ret) { |
32ce8569 MD |
1081 | DBG("Unable to create event %s, error %d\n", |
1082 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 1083 | } |
8165c8da | 1084 | } |
8020ceb5 | 1085 | } |
8020ceb5 MD |
1086 | } |
1087 | ||
a44d07da FD |
1088 | static |
1089 | void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc, | |
d8d2416d FD |
1090 | void (*event_func)(struct lttng_session *session, |
1091 | struct lttng_event *event), | |
1092 | void (*event_notifier_func)(struct lttng_event_notifier *event_notifier)) | |
35ac38cb FD |
1093 | { |
1094 | struct cds_hlist_node *node, *tmp_node; | |
1095 | struct cds_list_head *sessionsp; | |
a44d07da | 1096 | unsigned int i; |
35ac38cb FD |
1097 | |
1098 | /* Get handle on list of sessions. */ | |
1099 | sessionsp = _lttng_get_sessions(); | |
1100 | ||
1101 | /* | |
a44d07da FD |
1102 | * Iterate over all events in the probe provider descriptions and |
1103 | * sessions to queue the unregistration of the events. | |
35ac38cb FD |
1104 | */ |
1105 | for (i = 0; i < provider_desc->nr_events; i++) { | |
1106 | const struct lttng_event_desc *event_desc; | |
d8d2416d FD |
1107 | struct lttng_event_notifier_group *event_notifier_group; |
1108 | struct lttng_event_notifier *event_notifier; | |
a44d07da FD |
1109 | struct lttng_session *session; |
1110 | struct cds_hlist_head *head; | |
1111 | struct lttng_event *event; | |
35ac38cb FD |
1112 | |
1113 | event_desc = provider_desc->event_desc[i]; | |
35ac38cb | 1114 | |
a44d07da FD |
1115 | /* |
1116 | * Iterate over all session to find the current event | |
1117 | * description. | |
1118 | */ | |
35ac38cb FD |
1119 | cds_list_for_each_entry(session, sessionsp, node) { |
1120 | /* | |
a44d07da FD |
1121 | * Get the list of events in the hashtable bucket and |
1122 | * iterate to find the event matching this descriptor. | |
35ac38cb | 1123 | */ |
fb470188 FD |
1124 | head = borrow_hash_table_bucket( |
1125 | session->events_ht.table, | |
1126 | LTTNG_UST_EVENT_HT_SIZE, event_desc); | |
1127 | ||
a44d07da | 1128 | cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) { |
35ac38cb | 1129 | if (event_desc == event->desc) { |
a44d07da | 1130 | event_func(session, event); |
35ac38cb FD |
1131 | break; |
1132 | } | |
1133 | } | |
1134 | } | |
d8d2416d FD |
1135 | |
1136 | /* | |
1137 | * Iterate over all event_notifier groups to find the current event | |
1138 | * description. | |
1139 | */ | |
1140 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1141 | /* | |
1142 | * Get the list of event_notifiers in the hashtable bucket and | |
1143 | * iterate to find the event_notifier matching this | |
1144 | * descriptor. | |
1145 | */ | |
1146 | head = borrow_hash_table_bucket( | |
1147 | event_notifier_group->event_notifiers_ht.table, | |
1148 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, event_desc); | |
1149 | ||
1150 | cds_hlist_for_each_entry_safe(event_notifier, node, tmp_node, head, hlist) { | |
1151 | if (event_desc == event_notifier->desc) { | |
1152 | event_notifier_func(event_notifier); | |
1153 | break; | |
1154 | } | |
1155 | } | |
1156 | } | |
35ac38cb | 1157 | } |
a44d07da FD |
1158 | } |
1159 | ||
1160 | static | |
1161 | void _unregister_event(struct lttng_session *session, | |
1162 | struct lttng_event *event) | |
1163 | { | |
1164 | _lttng_event_unregister(event); | |
1165 | } | |
1166 | ||
1167 | static | |
1168 | void _event_enum_destroy(struct lttng_session *session, | |
1169 | struct lttng_event *event) | |
1170 | { | |
1171 | unsigned int i; | |
1172 | ||
1173 | /* Destroy enums of the current event. */ | |
1174 | for (i = 0; i < event->desc->nr_fields; i++) { | |
1175 | const struct lttng_enum_desc *enum_desc; | |
1176 | const struct lttng_event_field *field; | |
1177 | struct lttng_enum *curr_enum; | |
1178 | ||
1179 | field = &(event->desc->fields[i]); | |
1180 | switch (field->type.atype) { | |
1181 | case atype_enum: | |
1182 | enum_desc = field->type.u.legacy.basic.enumeration.desc; | |
1183 | break; | |
1184 | case atype_enum_nestable: | |
1185 | enum_desc = field->type.u.enum_nestable.desc; | |
1186 | break; | |
1187 | default: | |
1188 | continue; | |
1189 | } | |
1190 | ||
1191 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); | |
1192 | if (curr_enum) { | |
1193 | _lttng_enum_destroy(curr_enum); | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | /* Destroy event. */ | |
1198 | _lttng_event_destroy(event); | |
1199 | } | |
1200 | ||
1201 | /* | |
1202 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
1203 | * the probe provider descriptor received as argument. Must me called with the | |
1204 | * ust_lock held. | |
1205 | */ | |
1206 | void lttng_probe_provider_unregister_events( | |
1207 | struct lttng_probe_desc *provider_desc) | |
1208 | { | |
1209 | /* | |
1210 | * Iterate over all events in the probe provider descriptions and sessions | |
1211 | * to queue the unregistration of the events. | |
1212 | */ | |
d8d2416d FD |
1213 | probe_provider_event_for_each(provider_desc, _unregister_event, |
1214 | _lttng_event_notifier_unregister); | |
35ac38cb FD |
1215 | |
1216 | /* Wait for grace period. */ | |
10544ee8 | 1217 | lttng_ust_synchronize_trace(); |
35ac38cb FD |
1218 | /* Prune the unregistration queue. */ |
1219 | __tracepoint_probe_prune_release_queue(); | |
1220 | ||
1221 | /* | |
1222 | * It is now safe to destroy the events and remove them from the event list | |
1223 | * and hashtables. | |
1224 | */ | |
d8d2416d FD |
1225 | probe_provider_event_for_each(provider_desc, _event_enum_destroy, |
1226 | _lttng_event_notifier_destroy); | |
35ac38cb FD |
1227 | } |
1228 | ||
8020ceb5 | 1229 | /* |
d8d2416d | 1230 | * Create events associated with an event enabler (if not already present), |
e58095ef | 1231 | * and add backward reference from the event to the enabler. |
8020ceb5 MD |
1232 | */ |
1233 | static | |
d871c65b | 1234 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1235 | { |
d871c65b | 1236 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1237 | struct lttng_event *event; |
1238 | ||
d871c65b | 1239 | if (!lttng_event_enabler_as_enabler(event_enabler)->enabled) |
de713d8a FD |
1240 | goto end; |
1241 | ||
e58095ef | 1242 | /* First ensure that probe events are created for this enabler. */ |
d871c65b | 1243 | lttng_create_event_if_missing(event_enabler); |
e58095ef MD |
1244 | |
1245 | /* For each event matching enabler in session event list. */ | |
1246 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1247 | struct lttng_enabler_ref *enabler_ref; | |
1248 | ||
d871c65b | 1249 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
e58095ef MD |
1250 | continue; |
1251 | ||
d871c65b FD |
1252 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
1253 | lttng_event_enabler_as_enabler(event_enabler)); | |
e58095ef MD |
1254 | if (!enabler_ref) { |
1255 | /* | |
1256 | * If no backward ref, create it. | |
1257 | * Add backward ref from event to enabler. | |
1258 | */ | |
1259 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1260 | if (!enabler_ref) | |
1261 | return -ENOMEM; | |
d871c65b FD |
1262 | enabler_ref->ref = lttng_event_enabler_as_enabler( |
1263 | event_enabler); | |
e58095ef MD |
1264 | cds_list_add(&enabler_ref->node, |
1265 | &event->enablers_ref_head); | |
8165c8da | 1266 | } |
e58095ef MD |
1267 | |
1268 | /* | |
1269 | * Link filter bytecodes if not linked yet. | |
1270 | */ | |
53b9d7db FD |
1271 | lttng_enabler_link_bytecode(event->desc, |
1272 | &session->ctx, | |
a56fd376 | 1273 | &event->filter_bytecode_runtime_head, |
621c07fc | 1274 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
e58095ef MD |
1275 | |
1276 | /* TODO: merge event context. */ | |
1277 | } | |
de713d8a | 1278 | end: |
e58095ef MD |
1279 | return 0; |
1280 | } | |
1281 | ||
1282 | /* | |
1283 | * Called at library load: connect the probe on all enablers matching | |
1284 | * this event. | |
5f733922 | 1285 | * Called with session mutex held. |
e58095ef | 1286 | */ |
5f733922 | 1287 | int lttng_fix_pending_events(void) |
e58095ef MD |
1288 | { |
1289 | struct lttng_session *session; | |
1290 | ||
1291 | cds_list_for_each_entry(session, &sessions, node) { | |
d871c65b | 1292 | lttng_session_lazy_sync_event_enablers(session); |
8020ceb5 | 1293 | } |
e58095ef MD |
1294 | return 0; |
1295 | } | |
1296 | ||
d8d2416d FD |
1297 | int lttng_fix_pending_event_notifiers(void) |
1298 | { | |
1299 | struct lttng_event_notifier_group *event_notifier_group; | |
1300 | ||
1301 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1302 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1303 | } | |
1304 | return 0; | |
1305 | } | |
1306 | ||
246be17e | 1307 | /* |
37dddb65 MD |
1308 | * For each session of the owner thread, execute pending statedump. |
1309 | * Only dump state for the sessions owned by the caller thread, because | |
1310 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 1311 | */ |
3327ac33 | 1312 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
1313 | { |
1314 | struct lttng_session *session; | |
1315 | ||
37dddb65 | 1316 | /* Execute state dump */ |
cf73e0fe | 1317 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
1318 | |
1319 | /* Clear pending state dump */ | |
3327ac33 MD |
1320 | if (ust_lock()) { |
1321 | goto end; | |
1322 | } | |
246be17e | 1323 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
1324 | if (session->owner != owner) |
1325 | continue; | |
1326 | if (!session->statedump_pending) | |
1327 | continue; | |
1328 | session->statedump_pending = 0; | |
246be17e | 1329 | } |
3327ac33 | 1330 | end: |
37dddb65 | 1331 | ust_unlock(); |
3327ac33 | 1332 | return; |
246be17e PW |
1333 | } |
1334 | ||
e58095ef MD |
1335 | /* |
1336 | * Only used internally at session destruction. | |
1337 | */ | |
1338 | static | |
1339 | void _lttng_event_destroy(struct lttng_event *event) | |
1340 | { | |
1341 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1342 | ||
35ac38cb | 1343 | /* Remove from event list. */ |
e58095ef | 1344 | cds_list_del(&event->node); |
35ac38cb FD |
1345 | /* Remove from event hash table. */ |
1346 | cds_hlist_del(&event->hlist); | |
1347 | ||
8020ceb5 | 1348 | lttng_destroy_context(event->ctx); |
f488575f | 1349 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1350 | /* Free event enabler refs */ |
1351 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1352 | &event->enablers_ref_head, node) | |
1353 | free(enabler_ref); | |
b5234c06 | 1354 | free(event); |
8020ceb5 MD |
1355 | } |
1356 | ||
c785c634 MD |
1357 | static |
1358 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1359 | { | |
1360 | cds_list_del(&_enum->node); | |
35ac38cb | 1361 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1362 | free(_enum); |
1363 | } | |
1364 | ||
003fedf4 | 1365 | void lttng_ust_events_exit(void) |
8020ceb5 | 1366 | { |
7dd08bec | 1367 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1368 | |
e58095ef | 1369 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1370 | lttng_session_destroy(session); |
8020ceb5 | 1371 | } |
457a6b58 | 1372 | |
e58095ef MD |
1373 | /* |
1374 | * Enabler management. | |
1375 | */ | |
d871c65b FD |
1376 | struct lttng_event_enabler *lttng_event_enabler_create( |
1377 | enum lttng_enabler_format_type format_type, | |
e58095ef MD |
1378 | struct lttng_ust_event *event_param, |
1379 | struct lttng_channel *chan) | |
457a6b58 | 1380 | { |
d871c65b | 1381 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1382 | |
d871c65b FD |
1383 | event_enabler = zmalloc(sizeof(*event_enabler)); |
1384 | if (!event_enabler) | |
e58095ef | 1385 | return NULL; |
d871c65b FD |
1386 | event_enabler->base.format_type = format_type; |
1387 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1388 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); | |
1389 | memcpy(&event_enabler->base.event_param, event_param, | |
1390 | sizeof(event_enabler->base.event_param)); | |
1391 | event_enabler->chan = chan; | |
e58095ef | 1392 | /* ctx left NULL */ |
d871c65b FD |
1393 | event_enabler->base.enabled = 0; |
1394 | cds_list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); | |
1395 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1396 | ||
1397 | return event_enabler; | |
457a6b58 MD |
1398 | } |
1399 | ||
d8d2416d FD |
1400 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
1401 | struct lttng_event_notifier_group *event_notifier_group, | |
1402 | enum lttng_enabler_format_type format_type, | |
1403 | struct lttng_ust_event_notifier *event_notifier_param) | |
1404 | { | |
1405 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1406 | ||
1407 | event_notifier_enabler = zmalloc(sizeof(*event_notifier_enabler)); | |
1408 | if (!event_notifier_enabler) | |
1409 | return NULL; | |
1410 | event_notifier_enabler->base.format_type = format_type; | |
1411 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
d37ecb3f | 1412 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
d8d2416d FD |
1413 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.excluder_head); |
1414 | ||
1415 | event_notifier_enabler->user_token = event_notifier_param->event.token; | |
9560f5eb | 1416 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
d37ecb3f | 1417 | event_notifier_enabler->num_captures = 0; |
d8d2416d FD |
1418 | |
1419 | memcpy(&event_notifier_enabler->base.event_param.name, | |
1420 | event_notifier_param->event.name, | |
1421 | sizeof(event_notifier_enabler->base.event_param.name)); | |
1422 | event_notifier_enabler->base.event_param.instrumentation = | |
1423 | event_notifier_param->event.instrumentation; | |
1424 | event_notifier_enabler->base.event_param.loglevel = | |
1425 | event_notifier_param->event.loglevel; | |
1426 | event_notifier_enabler->base.event_param.loglevel_type = | |
1427 | event_notifier_param->event.loglevel_type; | |
1428 | ||
1429 | event_notifier_enabler->base.enabled = 0; | |
1430 | event_notifier_enabler->group = event_notifier_group; | |
1431 | ||
1432 | cds_list_add(&event_notifier_enabler->node, | |
1433 | &event_notifier_group->enablers_head); | |
1434 | ||
1435 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1436 | ||
1437 | return event_notifier_enabler; | |
1438 | } | |
1439 | ||
d871c65b | 1440 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1441 | { |
d871c65b FD |
1442 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
1443 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1444 | ||
e58095ef | 1445 | return 0; |
457a6b58 | 1446 | } |
457a6b58 | 1447 | |
d871c65b | 1448 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1449 | { |
d871c65b FD |
1450 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1451 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1452 | ||
e58095ef MD |
1453 | return 0; |
1454 | } | |
457a6b58 | 1455 | |
d871c65b | 1456 | static |
a56fd376 | 1457 | void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
ab249ecf | 1458 | struct lttng_ust_bytecode_node *bytecode) |
e58095ef MD |
1459 | { |
1460 | bytecode->enabler = enabler; | |
1461 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
d871c65b FD |
1462 | } |
1463 | ||
a56fd376 | 1464 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
ab249ecf | 1465 | struct lttng_ust_bytecode_node *bytecode) |
d871c65b | 1466 | { |
a56fd376 | 1467 | _lttng_enabler_attach_filter_bytecode( |
d871c65b FD |
1468 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
1469 | ||
1470 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
e58095ef | 1471 | return 0; |
0bfb5cbd JI |
1472 | } |
1473 | ||
d871c65b FD |
1474 | static |
1475 | void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
0bfb5cbd JI |
1476 | struct lttng_ust_excluder_node *excluder) |
1477 | { | |
1478 | excluder->enabler = enabler; | |
1479 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
d871c65b FD |
1480 | } |
1481 | ||
1482 | int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler, | |
1483 | struct lttng_ust_excluder_node *excluder) | |
1484 | { | |
1485 | _lttng_enabler_attach_exclusion( | |
1486 | lttng_event_enabler_as_enabler(event_enabler), excluder); | |
1487 | ||
1488 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
0bfb5cbd | 1489 | return 0; |
e58095ef | 1490 | } |
f488575f | 1491 | |
d8d2416d FD |
1492 | int lttng_event_notifier_enabler_enable( |
1493 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1494 | { | |
1495 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
1496 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1497 | ||
1498 | return 0; | |
1499 | } | |
1500 | ||
1501 | int lttng_event_notifier_enabler_disable( | |
1502 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1503 | { | |
1504 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
1505 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1506 | ||
1507 | return 0; | |
1508 | } | |
1509 | ||
a56fd376 | 1510 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
d8d2416d | 1511 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
ab249ecf | 1512 | struct lttng_ust_bytecode_node *bytecode) |
d8d2416d | 1513 | { |
a56fd376 | 1514 | _lttng_enabler_attach_filter_bytecode( |
d8d2416d FD |
1515 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
1516 | bytecode); | |
1517 | ||
1518 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1519 | return 0; | |
1520 | } | |
1521 | ||
d37ecb3f FD |
1522 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
1523 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1524 | struct lttng_ust_bytecode_node *bytecode) | |
1525 | { | |
1526 | bytecode->enabler = lttng_event_notifier_enabler_as_enabler( | |
1527 | event_notifier_enabler); | |
1528 | cds_list_add_tail(&bytecode->node, | |
1529 | &event_notifier_enabler->capture_bytecode_head); | |
1530 | event_notifier_enabler->num_captures++; | |
1531 | ||
1532 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1533 | return 0; | |
1534 | } | |
1535 | ||
d8d2416d FD |
1536 | int lttng_event_notifier_enabler_attach_exclusion( |
1537 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1538 | struct lttng_ust_excluder_node *excluder) | |
1539 | { | |
1540 | _lttng_enabler_attach_exclusion( | |
1541 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), | |
1542 | excluder); | |
1543 | ||
1544 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1545 | return 0; | |
1546 | } | |
1547 | ||
e58095ef | 1548 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1549 | union ust_args *uargs, |
e58095ef MD |
1550 | struct lttng_ctx **ctx, struct lttng_session *session) |
1551 | { | |
457a6b58 | 1552 | /* |
e58095ef MD |
1553 | * We cannot attach a context after trace has been started for a |
1554 | * session because the metadata does not allow expressing this | |
1555 | * information outside of the original channel scope. | |
457a6b58 | 1556 | */ |
e58095ef MD |
1557 | if (session->been_active) |
1558 | return -EPERM; | |
457a6b58 | 1559 | |
e58095ef MD |
1560 | switch (context_param->ctx) { |
1561 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1562 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1563 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1564 | { | |
1565 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1566 | ||
1567 | perf_ctx_param = &context_param->u.perf_counter; | |
1568 | return lttng_add_perf_counter_to_ctx( | |
1569 | perf_ctx_param->type, | |
1570 | perf_ctx_param->config, | |
1571 | perf_ctx_param->name, | |
1572 | ctx); | |
1573 | } | |
e58095ef MD |
1574 | case LTTNG_UST_CONTEXT_VTID: |
1575 | return lttng_add_vtid_to_ctx(ctx); | |
1576 | case LTTNG_UST_CONTEXT_VPID: | |
1577 | return lttng_add_vpid_to_ctx(ctx); | |
1578 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1579 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1580 | case LTTNG_UST_CONTEXT_IP: |
1581 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1582 | case LTTNG_UST_CONTEXT_CPU_ID: |
1583 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1584 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1585 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1586 | ctx); | |
735bef47 MJ |
1587 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1588 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1589 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1590 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1591 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1592 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1593 | case LTTNG_UST_CONTEXT_NET_NS: | |
1594 | return lttng_add_net_ns_to_ctx(ctx); | |
1595 | case LTTNG_UST_CONTEXT_PID_NS: | |
1596 | return lttng_add_pid_ns_to_ctx(ctx); | |
cefef7a7 MJ |
1597 | case LTTNG_UST_CONTEXT_TIME_NS: |
1598 | return lttng_add_time_ns_to_ctx(ctx); | |
735bef47 MJ |
1599 | case LTTNG_UST_CONTEXT_USER_NS: |
1600 | return lttng_add_user_ns_to_ctx(ctx); | |
1601 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1602 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1603 | case LTTNG_UST_CONTEXT_VUID: |
1604 | return lttng_add_vuid_to_ctx(ctx); | |
1605 | case LTTNG_UST_CONTEXT_VEUID: | |
1606 | return lttng_add_veuid_to_ctx(ctx); | |
1607 | case LTTNG_UST_CONTEXT_VSUID: | |
1608 | return lttng_add_vsuid_to_ctx(ctx); | |
1609 | case LTTNG_UST_CONTEXT_VGID: | |
1610 | return lttng_add_vgid_to_ctx(ctx); | |
1611 | case LTTNG_UST_CONTEXT_VEGID: | |
1612 | return lttng_add_vegid_to_ctx(ctx); | |
1613 | case LTTNG_UST_CONTEXT_VSGID: | |
1614 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1615 | default: |
1616 | return -EINVAL; | |
457a6b58 | 1617 | } |
457a6b58 MD |
1618 | } |
1619 | ||
d871c65b | 1620 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
e58095ef | 1621 | struct lttng_ust_context *context_param) |
457a6b58 | 1622 | { |
e58095ef | 1623 | return -ENOSYS; |
457a6b58 MD |
1624 | } |
1625 | ||
d871c65b | 1626 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1627 | { |
d871c65b FD |
1628 | if (!event_enabler) { |
1629 | return; | |
0f63324a | 1630 | } |
d871c65b | 1631 | cds_list_del(&event_enabler->node); |
0f63324a | 1632 | |
d871c65b | 1633 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef | 1634 | |
d871c65b FD |
1635 | lttng_destroy_context(event_enabler->ctx); |
1636 | free(event_enabler); | |
457a6b58 MD |
1637 | } |
1638 | ||
e58095ef | 1639 | /* |
d871c65b | 1640 | * lttng_session_sync_event_enablers should be called just before starting a |
e58095ef MD |
1641 | * session. |
1642 | */ | |
457a6b58 | 1643 | static |
d871c65b | 1644 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1645 | { |
d871c65b | 1646 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1647 | struct lttng_event *event; |
457a6b58 | 1648 | |
d871c65b FD |
1649 | cds_list_for_each_entry(event_enabler, &session->enablers_head, node) |
1650 | lttng_event_enabler_ref_events(event_enabler); | |
e58095ef MD |
1651 | /* |
1652 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1653 | * and its channel and session transient states are enabled, we |
1654 | * enable the event, else we disable it. | |
e58095ef MD |
1655 | */ |
1656 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1657 | struct lttng_enabler_ref *enabler_ref; | |
1658 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1659 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1660 | |
1661 | /* Enable events */ | |
1662 | cds_list_for_each_entry(enabler_ref, | |
1663 | &event->enablers_ref_head, node) { | |
1664 | if (enabler_ref->ref->enabled) { | |
1665 | enabled = 1; | |
1666 | break; | |
1667 | } | |
1668 | } | |
ac6b4ac6 MD |
1669 | /* |
1670 | * Enabled state is based on union of enablers, with | |
1671 | * intesection of session and channel transient enable | |
1672 | * states. | |
1673 | */ | |
1674 | enabled = enabled && session->tstate && event->chan->tstate; | |
1675 | ||
1676 | CMM_STORE_SHARED(event->enabled, enabled); | |
1677 | /* | |
1678 | * Sync tracepoint registration with event enabled | |
1679 | * state. | |
1680 | */ | |
1681 | if (enabled) { | |
1682 | if (!event->registered) | |
1683 | register_event(event); | |
1684 | } else { | |
1685 | if (event->registered) | |
1686 | unregister_event(event); | |
1687 | } | |
457a6b58 | 1688 | |
1f49fc05 | 1689 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1690 | cds_list_for_each_entry(enabler_ref, |
1691 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1692 | if (enabler_ref->ref->enabled |
1693 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1694 | has_enablers_without_bytecode = 1; |
1695 | break; | |
1696 | } | |
1697 | } | |
1698 | event->has_enablers_without_bytecode = | |
1699 | has_enablers_without_bytecode; | |
1700 | ||
e58095ef MD |
1701 | /* Enable filters */ |
1702 | cds_list_for_each_entry(runtime, | |
a56fd376 | 1703 | &event->filter_bytecode_runtime_head, node) { |
4d451c15 | 1704 | lttng_bytecode_filter_sync_state(runtime); |
457a6b58 MD |
1705 | } |
1706 | } | |
baa1e0bc | 1707 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1708 | } |
1709 | ||
d8d2416d FD |
1710 | static |
1711 | void lttng_create_event_notifier_if_missing( | |
1712 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1713 | { | |
1714 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1715 | struct lttng_probe_desc *probe_desc; | |
1716 | struct cds_list_head *probe_list; | |
1717 | int i; | |
1718 | ||
1719 | probe_list = lttng_get_probe_list_head(); | |
1720 | ||
1721 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1722 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1723 | int ret; | |
1724 | bool found = false; | |
1725 | const struct lttng_event_desc *desc; | |
1726 | struct lttng_event_notifier *event_notifier; | |
1727 | struct cds_hlist_head *head; | |
1728 | struct cds_hlist_node *node; | |
1729 | ||
1730 | desc = probe_desc->event_desc[i]; | |
d37ecb3f | 1731 | |
d8d2416d FD |
1732 | if (!lttng_desc_match_enabler(desc, |
1733 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1734 | continue; | |
1735 | ||
1736 | /* | |
1737 | * Given the current event_notifier group, get the bucket that | |
1738 | * the target event_notifier would be if it was already | |
1739 | * created. | |
1740 | */ | |
1741 | head = borrow_hash_table_bucket( | |
1742 | event_notifier_group->event_notifiers_ht.table, | |
1743 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
1744 | ||
1745 | cds_hlist_for_each_entry(event_notifier, node, head, hlist) { | |
1746 | /* | |
1747 | * Check if event_notifier already exists by checking | |
1748 | * if the event_notifier and enabler share the same | |
1749 | * description and id. | |
1750 | */ | |
1751 | if (event_notifier->desc == desc && | |
1752 | event_notifier->user_token == event_notifier_enabler->user_token) { | |
1753 | found = true; | |
1754 | break; | |
1755 | } | |
1756 | } | |
1757 | ||
1758 | if (found) | |
1759 | continue; | |
1760 | ||
1761 | /* | |
1762 | * We need to create a event_notifier for this event probe. | |
1763 | */ | |
1764 | ret = lttng_event_notifier_create(desc, | |
1765 | event_notifier_enabler->user_token, | |
6566528b | 1766 | event_notifier_enabler->error_counter_index, |
d8d2416d FD |
1767 | event_notifier_group); |
1768 | if (ret) { | |
1769 | DBG("Unable to create event_notifier %s, error %d\n", | |
1770 | probe_desc->event_desc[i]->name, ret); | |
1771 | } | |
1772 | } | |
1773 | } | |
1774 | } | |
1775 | ||
1776 | /* | |
1777 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
1778 | */ | |
1779 | static | |
1780 | int lttng_event_notifier_enabler_ref_event_notifiers( | |
1781 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1782 | { | |
1783 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1784 | struct lttng_event_notifier *event_notifier; | |
1785 | ||
1786 | /* | |
1787 | * Only try to create event_notifiers for enablers that are enabled, the user | |
1788 | * might still be attaching filter or exclusion to the | |
1789 | * event_notifier_enabler. | |
1790 | */ | |
1791 | if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled) | |
1792 | goto end; | |
1793 | ||
1794 | /* First, ensure that probe event_notifiers are created for this enabler. */ | |
1795 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
1796 | ||
1797 | /* Link the created event_notifier with its associated enabler. */ | |
1798 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1799 | struct lttng_enabler_ref *enabler_ref; | |
1800 | ||
1801 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
1802 | continue; | |
1803 | ||
1804 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
1805 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1806 | if (!enabler_ref) { | |
1807 | /* | |
1808 | * If no backward ref, create it. | |
1809 | * Add backward ref from event_notifier to enabler. | |
1810 | */ | |
1811 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1812 | if (!enabler_ref) | |
1813 | return -ENOMEM; | |
1814 | ||
1815 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
1816 | event_notifier_enabler); | |
1817 | cds_list_add(&enabler_ref->node, | |
1818 | &event_notifier->enablers_ref_head); | |
1819 | } | |
1820 | ||
1821 | /* | |
1822 | * Link filter bytecodes if not linked yet. | |
1823 | */ | |
1824 | lttng_enabler_link_bytecode(event_notifier->desc, | |
621c07fc FD |
1825 | &event_notifier_group->ctx, |
1826 | &event_notifier->filter_bytecode_runtime_head, | |
1827 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); | |
d37ecb3f FD |
1828 | |
1829 | /* | |
1830 | * Link capture bytecodes if not linked yet. | |
1831 | */ | |
1832 | lttng_enabler_link_bytecode(event_notifier->desc, | |
1833 | &event_notifier_group->ctx, &event_notifier->capture_bytecode_runtime_head, | |
1834 | &event_notifier_enabler->capture_bytecode_head); | |
1835 | ||
1836 | event_notifier->num_captures = event_notifier_enabler->num_captures; | |
d8d2416d FD |
1837 | } |
1838 | end: | |
1839 | return 0; | |
1840 | } | |
1841 | ||
1842 | static | |
1843 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
1844 | { | |
1845 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1846 | struct lttng_event_notifier *event_notifier; | |
1847 | ||
1848 | cds_list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
1849 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
1850 | ||
1851 | /* | |
1852 | * For each event_notifier, if at least one of its enablers is enabled, | |
1853 | * we enable the event_notifier, else we disable it. | |
1854 | */ | |
1855 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1856 | struct lttng_enabler_ref *enabler_ref; | |
1857 | struct lttng_bytecode_runtime *runtime; | |
1858 | int enabled = 0, has_enablers_without_bytecode = 0; | |
1859 | ||
1860 | /* Enable event_notifiers */ | |
1861 | cds_list_for_each_entry(enabler_ref, | |
1862 | &event_notifier->enablers_ref_head, node) { | |
1863 | if (enabler_ref->ref->enabled) { | |
1864 | enabled = 1; | |
1865 | break; | |
1866 | } | |
1867 | } | |
1868 | ||
1869 | CMM_STORE_SHARED(event_notifier->enabled, enabled); | |
1870 | /* | |
1871 | * Sync tracepoint registration with event_notifier enabled | |
1872 | * state. | |
1873 | */ | |
1874 | if (enabled) { | |
1875 | if (!event_notifier->registered) | |
1876 | register_event_notifier(event_notifier); | |
1877 | } else { | |
1878 | if (event_notifier->registered) | |
1879 | unregister_event_notifier(event_notifier); | |
1880 | } | |
1881 | ||
1882 | /* Check if has enablers without bytecode enabled */ | |
1883 | cds_list_for_each_entry(enabler_ref, | |
1884 | &event_notifier->enablers_ref_head, node) { | |
1885 | if (enabler_ref->ref->enabled | |
1886 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1887 | has_enablers_without_bytecode = 1; | |
1888 | break; | |
1889 | } | |
1890 | } | |
1891 | event_notifier->has_enablers_without_bytecode = | |
1892 | has_enablers_without_bytecode; | |
1893 | ||
1894 | /* Enable filters */ | |
1895 | cds_list_for_each_entry(runtime, | |
1896 | &event_notifier->filter_bytecode_runtime_head, node) { | |
4d451c15 | 1897 | lttng_bytecode_filter_sync_state(runtime); |
d8d2416d | 1898 | } |
d37ecb3f FD |
1899 | |
1900 | /* Enable captures. */ | |
1901 | cds_list_for_each_entry(runtime, | |
1902 | &event_notifier->capture_bytecode_runtime_head, node) { | |
1903 | lttng_bytecode_capture_sync_state(runtime); | |
1904 | } | |
d8d2416d FD |
1905 | } |
1906 | __tracepoint_probe_prune_release_queue(); | |
1907 | } | |
1908 | ||
e58095ef MD |
1909 | /* |
1910 | * Apply enablers to session events, adding events to session if need | |
1911 | * be. It is required after each modification applied to an active | |
1912 | * session, and right before session "start". | |
1913 | * "lazy" sync means we only sync if required. | |
1914 | */ | |
1915 | static | |
d871c65b | 1916 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1917 | { |
e58095ef MD |
1918 | /* We can skip if session is not active */ |
1919 | if (!session->active) | |
1920 | return; | |
d871c65b | 1921 | lttng_session_sync_event_enablers(session); |
457a6b58 | 1922 | } |
53569322 MD |
1923 | |
1924 | /* | |
1925 | * Update all sessions with the given app context. | |
1926 | * Called with ust lock held. | |
1927 | * This is invoked when an application context gets loaded/unloaded. It | |
1928 | * ensures the context callbacks are in sync with the application | |
1929 | * context (either app context callbacks, or dummy callbacks). | |
1930 | */ | |
1931 | void lttng_ust_context_set_session_provider(const char *name, | |
1932 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1933 | void (*record)(struct lttng_ctx_field *field, | |
1934 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1935 | struct lttng_channel *chan), | |
1936 | void (*get_value)(struct lttng_ctx_field *field, | |
1937 | struct lttng_ctx_value *value)) | |
1938 | { | |
1939 | struct lttng_session *session; | |
1940 | ||
1941 | cds_list_for_each_entry(session, &sessions, node) { | |
1942 | struct lttng_channel *chan; | |
1943 | struct lttng_event *event; | |
1944 | int ret; | |
1945 | ||
1946 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1947 | name, get_size, record, get_value); | |
1948 | if (ret) | |
1949 | abort(); | |
1950 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1951 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1952 | name, get_size, record, get_value); | |
1953 | if (ret) | |
1954 | abort(); | |
1955 | } | |
1956 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1957 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1958 | name, get_size, record, get_value); | |
1959 | if (ret) | |
1960 | abort(); | |
1961 | } | |
1962 | } | |
1963 | } | |
d8d2416d FD |
1964 | |
1965 | /* | |
1966 | * Update all event_notifier groups with the given app context. | |
1967 | * Called with ust lock held. | |
1968 | * This is invoked when an application context gets loaded/unloaded. It | |
1969 | * ensures the context callbacks are in sync with the application | |
1970 | * context (either app context callbacks, or dummy callbacks). | |
1971 | */ | |
1972 | void lttng_ust_context_set_event_notifier_group_provider(const char *name, | |
1973 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1974 | void (*record)(struct lttng_ctx_field *field, | |
1975 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1976 | struct lttng_channel *chan), | |
1977 | void (*get_value)(struct lttng_ctx_field *field, | |
1978 | struct lttng_ctx_value *value)) | |
1979 | { | |
1980 | struct lttng_event_notifier_group *event_notifier_group; | |
1981 | ||
1982 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1983 | int ret; | |
1984 | ||
1985 | ret = lttng_ust_context_set_provider_rcu( | |
1986 | &event_notifier_group->ctx, | |
1987 | name, get_size, record, get_value); | |
1988 | if (ret) | |
1989 | abort(); | |
1990 | } | |
1991 | } |