Commit | Line | Data |
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8020ceb5 | 1 | /* |
c0c0989a | 2 | * SPDX-License-Identifier: LGPL-2.1-only |
8020ceb5 | 3 | * |
e92f3e28 MD |
4 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
5 | * | |
c0c0989a | 6 | * Holds LTTng per-session event registry. |
8020ceb5 MD |
7 | */ |
8 | ||
3fbec7dc | 9 | #define _LGPL_SOURCE |
b5234c06 | 10 | #include <stdio.h> |
d8d2416d | 11 | #include <assert.h> |
b5234c06 | 12 | #include <errno.h> |
d8d2416d FD |
13 | #include <limits.h> |
14 | #include <pthread.h> | |
f4681817 MD |
15 | #include <sys/shm.h> |
16 | #include <sys/ipc.h> | |
44c72f10 MD |
17 | #include <stdint.h> |
18 | #include <stddef.h> | |
28b12049 MD |
19 | #include <inttypes.h> |
20 | #include <time.h> | |
196ec2df | 21 | #include <stdbool.h> |
d8d2416d | 22 | #include <unistd.h> |
10544ee8 | 23 | #include <dlfcn.h> |
2ae57758 | 24 | #include <lttng/ust-endian.h> |
44c72f10 | 25 | |
d8d2416d | 26 | #include <urcu/arch.h> |
44c72f10 | 27 | #include <urcu/compiler.h> |
d8d2416d FD |
28 | #include <urcu/hlist.h> |
29 | #include <urcu/list.h> | |
44c72f10 | 30 | #include <urcu/uatomic.h> |
44c72f10 MD |
31 | |
32 | #include <lttng/tracepoint.h> | |
4318ae1b | 33 | #include <lttng/ust-events.h> |
44c72f10 MD |
34 | |
35 | #include <usterr-signal-safe.h> | |
36 | #include <helper.h> | |
7d3e35b6 | 37 | #include <lttng/ust-ctl.h> |
32ce8569 | 38 | #include <ust-comm.h> |
d8d2416d | 39 | #include <ust-fd.h> |
53569322 MD |
40 | #include <lttng/ust-dynamic-type.h> |
41 | #include <lttng/ust-context-provider.h> | |
1f18504e | 42 | #include "error.h" |
08114193 | 43 | #include "compat.h" |
eda498b8 | 44 | #include "lttng-ust-uuid.h" |
44c72f10 | 45 | |
457a6b58 | 46 | #include "tracepoint-internal.h" |
196ec2df | 47 | #include "string-utils.h" |
4d451c15 | 48 | #include "lttng-bytecode.h" |
7dd08bec MD |
49 | #include "lttng-tracer.h" |
50 | #include "lttng-tracer-core.h" | |
cf73e0fe | 51 | #include "lttng-ust-statedump.h" |
51f804ec | 52 | #include "context-internal.h" |
d871c65b | 53 | #include "ust-events-internal.h" |
b728d87e | 54 | #include "wait.h" |
8d8a24c8 | 55 | #include "../libringbuffer/shm.h" |
ebabbf58 | 56 | #include "../libcounter/counter.h" |
596c4223 | 57 | #include "jhash.h" |
d8d2416d | 58 | #include <lttng/ust-abi.h> |
8165c8da MD |
59 | |
60 | /* | |
3327ac33 MD |
61 | * All operations within this file are called by the communication |
62 | * thread, under ust_lock protection. | |
8165c8da | 63 | */ |
8165c8da | 64 | |
b5234c06 | 65 | static CDS_LIST_HEAD(sessions); |
d8d2416d | 66 | static CDS_LIST_HEAD(event_notifier_groups); |
8165c8da | 67 | |
37dddb65 MD |
68 | struct cds_list_head *_lttng_get_sessions(void) |
69 | { | |
70 | return &sessions; | |
71 | } | |
72 | ||
7dd08bec | 73 | static void _lttng_event_destroy(struct lttng_event *event); |
d8d2416d FD |
74 | static void _lttng_event_notifier_destroy( |
75 | struct lttng_event_notifier *event_notifier); | |
c785c634 | 76 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 77 | |
e58095ef | 78 | static |
d871c65b | 79 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
e58095ef | 80 | static |
d871c65b | 81 | void lttng_session_sync_event_enablers(struct lttng_session *session); |
e58095ef | 82 | static |
d8d2416d FD |
83 | void lttng_event_notifier_group_sync_enablers( |
84 | struct lttng_event_notifier_group *event_notifier_group); | |
85 | static | |
e58095ef MD |
86 | void lttng_enabler_destroy(struct lttng_enabler *enabler); |
87 | ||
bb84a1ec MD |
88 | /* |
89 | * @buf must hold at least LTTNG_UST_SYM_NAME_LEN bytes. | |
90 | */ | |
91 | static | |
92 | int lttng_split_provider_event_name(const char *full_name, | |
93 | char *buf, const char **event_name, | |
94 | const char **provider_name) | |
95 | { | |
96 | char *saveptr; | |
97 | ||
98 | if (strlen(full_name) >= LTTNG_UST_SYM_NAME_LEN) | |
99 | return -1; | |
100 | strcpy(buf, full_name); | |
101 | *provider_name = strtok_r(buf, ":", &saveptr); /* Stops at ':' or '\0'. */ | |
102 | if (!provider_name) | |
103 | return -1; | |
104 | *event_name = strtok_r(NULL, ":", &saveptr); /* Stops at ':' or '\0'. */ | |
105 | if (!event_name) | |
106 | return -1; | |
107 | /* | |
108 | * Ensure we don't have leftover characters. Stops at '\0'. It validates | |
109 | * that neither the provider nor event name contain ':'. | |
110 | */ | |
111 | if (strtok_r(NULL, "", &saveptr)) | |
112 | return -1; | |
113 | return 0; | |
114 | } | |
115 | ||
6715d7d1 MD |
116 | /* |
117 | * Called with ust lock held. | |
118 | */ | |
119 | int lttng_session_active(void) | |
120 | { | |
121 | struct lttng_session *iter; | |
122 | ||
123 | cds_list_for_each_entry(iter, &sessions, node) { | |
124 | if (iter->active) | |
125 | return 1; | |
126 | } | |
127 | return 0; | |
128 | } | |
129 | ||
e58095ef MD |
130 | static |
131 | int lttng_loglevel_match(int loglevel, | |
132 | unsigned int has_loglevel, | |
457a6b58 MD |
133 | enum lttng_ust_loglevel_type req_type, |
134 | int req_loglevel) | |
135 | { | |
e58095ef MD |
136 | if (!has_loglevel) |
137 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
138 | switch (req_type) { |
139 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 140 | if (loglevel <= req_loglevel |
67ada458 | 141 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
142 | return 1; |
143 | else | |
144 | return 0; | |
145 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 146 | if (loglevel == req_loglevel |
67ada458 | 147 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
148 | return 1; |
149 | else | |
150 | return 0; | |
151 | case LTTNG_UST_LOGLEVEL_ALL: | |
152 | default: | |
67ada458 | 153 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
154 | return 1; |
155 | else | |
156 | return 0; | |
457a6b58 MD |
157 | } |
158 | } | |
159 | ||
7dd08bec | 160 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 161 | { |
7dd08bec | 162 | struct lttng_session *session; |
74d81a6c | 163 | int i; |
8020ceb5 | 164 | |
7dd08bec | 165 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
166 | if (!session) |
167 | return NULL; | |
51f804ec | 168 | if (lttng_context_init_all(&session->ctx)) { |
53569322 MD |
169 | free(session); |
170 | return NULL; | |
171 | } | |
e58095ef MD |
172 | CDS_INIT_LIST_HEAD(&session->chan_head); |
173 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 174 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 175 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
bb84a1ec MD |
176 | CDS_INIT_LIST_HEAD(&session->counters); |
177 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) | |
178 | CDS_INIT_HLIST_HEAD(&session->events_name_ht.table[i]); | |
d56fa719 | 179 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
c785c634 | 180 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); |
e58095ef | 181 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
182 | return session; |
183 | } | |
184 | ||
ebabbf58 MD |
185 | struct lttng_counter *lttng_ust_counter_create( |
186 | const char *counter_transport_name, | |
bb84a1ec MD |
187 | size_t number_dimensions, |
188 | const size_t *max_nr_elem, | |
189 | int64_t global_sum_step, | |
190 | bool coalesce_hits) | |
ebabbf58 MD |
191 | { |
192 | struct lttng_counter_transport *counter_transport = NULL; | |
193 | struct lttng_counter *counter = NULL; | |
194 | ||
195 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
196 | if (!counter_transport) | |
197 | goto notransport; | |
198 | counter = zmalloc(sizeof(struct lttng_counter)); | |
199 | if (!counter) | |
200 | goto nomem; | |
201 | ||
202 | counter->ops = &counter_transport->ops; | |
203 | counter->transport = counter_transport; | |
204 | ||
205 | counter->counter = counter->ops->counter_create( | |
bb84a1ec | 206 | number_dimensions, max_nr_elem, global_sum_step, |
ebabbf58 MD |
207 | -1, 0, NULL, false); |
208 | if (!counter->counter) { | |
209 | goto create_error; | |
210 | } | |
bb84a1ec | 211 | counter->parent.coalesce_hits = coalesce_hits; |
ebabbf58 MD |
212 | |
213 | return counter; | |
214 | ||
215 | create_error: | |
216 | free(counter); | |
217 | nomem: | |
218 | notransport: | |
219 | return NULL; | |
220 | } | |
221 | ||
222 | static | |
223 | void lttng_ust_counter_destroy(struct lttng_counter *counter) | |
224 | { | |
225 | counter->ops->counter_destroy(counter->counter); | |
226 | free(counter); | |
227 | } | |
228 | ||
bb84a1ec MD |
229 | struct lttng_counter *lttng_session_create_counter( |
230 | struct lttng_session *session, | |
231 | const char *counter_transport_name, | |
232 | size_t number_dimensions, const size_t *dimensions_sizes, | |
233 | int64_t global_sum_step, bool coalesce_hits) | |
234 | { | |
235 | struct lttng_counter *counter; | |
236 | struct lttng_event_container *container; | |
237 | ||
238 | counter = lttng_ust_counter_create(counter_transport_name, | |
239 | number_dimensions, dimensions_sizes, global_sum_step, | |
240 | coalesce_hits); | |
241 | if (!counter) { | |
242 | goto counter_error; | |
243 | } | |
244 | container = lttng_counter_get_event_container(counter); | |
245 | container->type = LTTNG_EVENT_CONTAINER_COUNTER; | |
246 | ||
247 | container->session = session; | |
248 | cds_list_add(&counter->node, &session->counters); | |
249 | ||
250 | return counter; | |
251 | ||
252 | counter_error: | |
253 | return NULL; | |
254 | } | |
255 | ||
d8d2416d FD |
256 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
257 | { | |
258 | struct lttng_event_notifier_group *event_notifier_group; | |
259 | int i; | |
260 | ||
261 | event_notifier_group = zmalloc(sizeof(struct lttng_event_notifier_group)); | |
262 | if (!event_notifier_group) | |
263 | return NULL; | |
264 | ||
51f804ec FD |
265 | /* Add all contexts. */ |
266 | if (lttng_context_init_all(&event_notifier_group->ctx)) { | |
267 | free(event_notifier_group); | |
268 | return NULL; | |
269 | } | |
270 | ||
d8d2416d FD |
271 | CDS_INIT_LIST_HEAD(&event_notifier_group->enablers_head); |
272 | CDS_INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
273 | for (i = 0; i < LTTNG_UST_EVENT_NOTIFIER_HT_SIZE; i++) | |
274 | CDS_INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
275 | ||
276 | cds_list_add(&event_notifier_group->node, &event_notifier_groups); | |
277 | ||
278 | return event_notifier_group; | |
279 | } | |
280 | ||
74d81a6c MD |
281 | /* |
282 | * Only used internally at session destruction. | |
283 | */ | |
284 | static | |
285 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
286 | { | |
287 | struct channel *chan; | |
288 | struct lttng_ust_shm_handle *handle; | |
289 | ||
290 | cds_list_del(<tng_chan->node); | |
291 | lttng_destroy_context(lttng_chan->ctx); | |
292 | chan = lttng_chan->chan; | |
293 | handle = lttng_chan->handle; | |
294 | /* | |
295 | * note: lttng_chan is private data contained within handle. It | |
296 | * will be freed along with the handle. | |
297 | */ | |
298 | channel_destroy(chan, handle, 0); | |
299 | } | |
300 | ||
ac6b4ac6 MD |
301 | static |
302 | void register_event(struct lttng_event *event) | |
303 | { | |
304 | int ret; | |
305 | const struct lttng_event_desc *desc; | |
306 | ||
307 | assert(event->registered == 0); | |
308 | desc = event->desc; | |
baa1e0bc | 309 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
310 | desc->probe_callback, |
311 | event, desc->signature); | |
312 | WARN_ON_ONCE(ret); | |
313 | if (!ret) | |
314 | event->registered = 1; | |
315 | } | |
316 | ||
d8d2416d FD |
317 | static |
318 | void register_event_notifier(struct lttng_event_notifier *event_notifier) | |
319 | { | |
320 | int ret; | |
321 | const struct lttng_event_desc *desc; | |
322 | ||
323 | assert(event_notifier->registered == 0); | |
324 | desc = event_notifier->desc; | |
325 | ret = __tracepoint_probe_register_queue_release(desc->name, | |
326 | desc->u.ext.event_notifier_callback, event_notifier, desc->signature); | |
327 | WARN_ON_ONCE(ret); | |
328 | if (!ret) | |
329 | event_notifier->registered = 1; | |
330 | } | |
331 | ||
ac6b4ac6 MD |
332 | static |
333 | void unregister_event(struct lttng_event *event) | |
334 | { | |
335 | int ret; | |
336 | const struct lttng_event_desc *desc; | |
337 | ||
338 | assert(event->registered == 1); | |
339 | desc = event->desc; | |
baa1e0bc | 340 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
341 | desc->probe_callback, |
342 | event); | |
343 | WARN_ON_ONCE(ret); | |
344 | if (!ret) | |
345 | event->registered = 0; | |
346 | } | |
347 | ||
d8d2416d FD |
348 | static |
349 | void unregister_event_notifier(struct lttng_event_notifier *event_notifier) | |
350 | { | |
351 | int ret; | |
352 | const struct lttng_event_desc *desc; | |
353 | ||
354 | assert(event_notifier->registered == 1); | |
355 | desc = event_notifier->desc; | |
356 | ret = __tracepoint_probe_unregister_queue_release(desc->name, | |
357 | desc->u.ext.event_notifier_callback, event_notifier); | |
358 | WARN_ON_ONCE(ret); | |
359 | if (!ret) | |
360 | event_notifier->registered = 0; | |
361 | } | |
362 | ||
ac6b4ac6 MD |
363 | /* |
364 | * Only used internally at session destruction. | |
365 | */ | |
366 | static | |
367 | void _lttng_event_unregister(struct lttng_event *event) | |
368 | { | |
369 | if (event->registered) | |
370 | unregister_event(event); | |
371 | } | |
372 | ||
d8d2416d FD |
373 | /* |
374 | * Only used internally at session destruction. | |
375 | */ | |
376 | static | |
377 | void _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier) | |
378 | { | |
379 | if (event_notifier->registered) | |
380 | unregister_event_notifier(event_notifier); | |
381 | } | |
382 | ||
7dd08bec | 383 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 384 | { |
7dd08bec MD |
385 | struct lttng_channel *chan, *tmpchan; |
386 | struct lttng_event *event, *tmpevent; | |
c785c634 | 387 | struct lttng_enum *_enum, *tmp_enum; |
d871c65b | 388 | struct lttng_event_enabler *event_enabler, *event_tmpenabler; |
8020ceb5 | 389 | |
b5234c06 | 390 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 391 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 392 | _lttng_event_unregister(event); |
8020ceb5 | 393 | } |
10544ee8 | 394 | lttng_ust_synchronize_trace(); /* Wait for in-flight events to complete */ |
baa1e0bc | 395 | __tracepoint_probe_prune_release_queue(); |
d871c65b | 396 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
e58095ef | 397 | &session->enablers_head, node) |
d871c65b | 398 | lttng_event_enabler_destroy(event_enabler); |
e58095ef MD |
399 | cds_list_for_each_entry_safe(event, tmpevent, |
400 | &session->events_head, node) | |
7dd08bec | 401 | _lttng_event_destroy(event); |
c785c634 MD |
402 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
403 | &session->enums_head, node) | |
404 | _lttng_enum_destroy(_enum); | |
e58095ef | 405 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 406 | _lttng_channel_unmap(chan); |
e58095ef | 407 | cds_list_del(&session->node); |
53569322 | 408 | lttng_destroy_context(session->ctx); |
b5234c06 | 409 | free(session); |
8020ceb5 MD |
410 | } |
411 | ||
d8d2416d FD |
412 | void lttng_event_notifier_group_destroy( |
413 | struct lttng_event_notifier_group *event_notifier_group) | |
414 | { | |
415 | int close_ret; | |
416 | struct lttng_event_notifier_enabler *notifier_enabler, *tmpnotifier_enabler; | |
417 | struct lttng_event_notifier *notifier, *tmpnotifier; | |
418 | ||
419 | if (!event_notifier_group) { | |
420 | return; | |
421 | } | |
422 | ||
423 | cds_list_for_each_entry(notifier, | |
424 | &event_notifier_group->event_notifiers_head, node) | |
425 | _lttng_event_notifier_unregister(notifier); | |
426 | ||
10544ee8 | 427 | lttng_ust_synchronize_trace(); |
d8d2416d FD |
428 | |
429 | cds_list_for_each_entry_safe(notifier_enabler, tmpnotifier_enabler, | |
430 | &event_notifier_group->enablers_head, node) | |
431 | lttng_event_notifier_enabler_destroy(notifier_enabler); | |
432 | ||
433 | cds_list_for_each_entry_safe(notifier, tmpnotifier, | |
434 | &event_notifier_group->event_notifiers_head, node) | |
435 | _lttng_event_notifier_destroy(notifier); | |
436 | ||
ebabbf58 MD |
437 | if (event_notifier_group->error_counter) |
438 | lttng_ust_counter_destroy(event_notifier_group->error_counter); | |
439 | ||
440 | /* Close the notification fd to the listener of event_notifiers. */ | |
d8d2416d FD |
441 | |
442 | lttng_ust_lock_fd_tracker(); | |
443 | close_ret = close(event_notifier_group->notification_fd); | |
444 | if (!close_ret) { | |
445 | lttng_ust_delete_fd_from_tracker( | |
446 | event_notifier_group->notification_fd); | |
447 | } else { | |
448 | PERROR("close"); | |
449 | abort(); | |
450 | } | |
451 | lttng_ust_unlock_fd_tracker(); | |
452 | ||
453 | cds_list_del(&event_notifier_group->node); | |
454 | ||
455 | free(event_notifier_group); | |
456 | } | |
457 | ||
d871c65b FD |
458 | static |
459 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
460 | { | |
ab249ecf | 461 | struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node; |
d871c65b FD |
462 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
463 | ||
464 | if (!enabler) { | |
465 | return; | |
466 | } | |
467 | ||
468 | /* Destroy filter bytecode */ | |
469 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
470 | &enabler->filter_bytecode_head, node) { | |
471 | free(filter_node); | |
472 | } | |
473 | ||
474 | /* Destroy excluders */ | |
475 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
476 | &enabler->excluder_head, node) { | |
477 | free(excluder_node); | |
478 | } | |
479 | } | |
480 | ||
d8d2416d FD |
481 | void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler) |
482 | { | |
483 | if (!event_notifier_enabler) { | |
484 | return; | |
485 | } | |
486 | ||
487 | cds_list_del(&event_notifier_enabler->node); | |
488 | ||
489 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
490 | ||
491 | free(event_notifier_enabler); | |
492 | } | |
493 | ||
53569322 MD |
494 | static |
495 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
496 | struct lttng_session *session) | |
497 | { | |
498 | const char *enum_name = desc->name; | |
499 | struct lttng_enum *_enum; | |
500 | struct cds_hlist_head *head; | |
53569322 MD |
501 | int ret = 0; |
502 | size_t name_len = strlen(enum_name); | |
503 | uint32_t hash; | |
504 | int notify_socket; | |
505 | ||
b33b46f7 | 506 | /* Check if this enum is already registered for this session. */ |
53569322 MD |
507 | hash = jhash(enum_name, name_len, 0); |
508 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
b33b46f7 FD |
509 | |
510 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
511 | if (_enum) { | |
512 | ret = -EEXIST; | |
513 | goto exist; | |
53569322 MD |
514 | } |
515 | ||
516 | notify_socket = lttng_get_notify_socket(session->owner); | |
517 | if (notify_socket < 0) { | |
518 | ret = notify_socket; | |
519 | goto socket_error; | |
520 | } | |
521 | ||
522 | _enum = zmalloc(sizeof(*_enum)); | |
523 | if (!_enum) { | |
524 | ret = -ENOMEM; | |
525 | goto cache_error; | |
526 | } | |
527 | _enum->session = session; | |
528 | _enum->desc = desc; | |
529 | ||
530 | ret = ustcomm_register_enum(notify_socket, | |
531 | session->objd, | |
532 | enum_name, | |
533 | desc->nr_entries, | |
534 | desc->entries, | |
535 | &_enum->id); | |
536 | if (ret < 0) { | |
537 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
538 | goto sessiond_register_error; | |
539 | } | |
540 | cds_list_add(&_enum->node, &session->enums_head); | |
541 | cds_hlist_add_head(&_enum->hlist, head); | |
542 | return 0; | |
543 | ||
544 | sessiond_register_error: | |
545 | free(_enum); | |
546 | cache_error: | |
547 | socket_error: | |
548 | exist: | |
549 | return ret; | |
550 | } | |
551 | ||
552 | static | |
553 | int lttng_create_enum_check(const struct lttng_type *type, | |
554 | struct lttng_session *session) | |
555 | { | |
556 | switch (type->atype) { | |
557 | case atype_enum: | |
558 | { | |
559 | const struct lttng_enum_desc *enum_desc; | |
560 | int ret; | |
561 | ||
218deb69 MD |
562 | enum_desc = type->u.legacy.basic.enumeration.desc; |
563 | ret = lttng_enum_create(enum_desc, session); | |
564 | if (ret && ret != -EEXIST) { | |
565 | DBG("Unable to create enum error: (%d)", ret); | |
566 | return ret; | |
567 | } | |
568 | break; | |
569 | } | |
570 | case atype_enum_nestable: | |
571 | { | |
572 | const struct lttng_enum_desc *enum_desc; | |
573 | int ret; | |
574 | ||
575 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
576 | ret = lttng_enum_create(enum_desc, session); |
577 | if (ret && ret != -EEXIST) { | |
578 | DBG("Unable to create enum error: (%d)", ret); | |
579 | return ret; | |
580 | } | |
581 | break; | |
582 | } | |
583 | case atype_dynamic: | |
584 | { | |
585 | const struct lttng_event_field *tag_field_generic; | |
586 | const struct lttng_enum_desc *enum_desc; | |
587 | int ret; | |
588 | ||
589 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 590 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
591 | ret = lttng_enum_create(enum_desc, session); |
592 | if (ret && ret != -EEXIST) { | |
593 | DBG("Unable to create enum error: (%d)", ret); | |
594 | return ret; | |
595 | } | |
596 | break; | |
597 | } | |
598 | default: | |
599 | /* TODO: nested types when they become supported. */ | |
600 | break; | |
601 | } | |
602 | return 0; | |
603 | } | |
604 | ||
605 | static | |
606 | int lttng_create_all_event_enums(size_t nr_fields, | |
607 | const struct lttng_event_field *event_fields, | |
608 | struct lttng_session *session) | |
609 | { | |
610 | size_t i; | |
611 | int ret; | |
612 | ||
613 | /* For each field, ensure enum is part of the session. */ | |
614 | for (i = 0; i < nr_fields; i++) { | |
615 | const struct lttng_type *type = &event_fields[i].type; | |
616 | ||
617 | ret = lttng_create_enum_check(type, session); | |
618 | if (ret) | |
619 | return ret; | |
620 | } | |
621 | return 0; | |
622 | } | |
623 | ||
624 | static | |
625 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
626 | const struct lttng_ctx_field *ctx_fields, | |
627 | struct lttng_session *session) | |
628 | { | |
629 | size_t i; | |
630 | int ret; | |
631 | ||
632 | /* For each field, ensure enum is part of the session. */ | |
633 | for (i = 0; i < nr_fields; i++) { | |
634 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
635 | ||
636 | ret = lttng_create_enum_check(type, session); | |
637 | if (ret) | |
638 | return ret; | |
639 | } | |
640 | return 0; | |
641 | } | |
642 | ||
710b8ee3 MD |
643 | /* |
644 | * Ensure that a state-dump will be performed for this session at the end | |
645 | * of the current handle_message(). | |
646 | */ | |
647 | int lttng_session_statedump(struct lttng_session *session) | |
648 | { | |
649 | session->statedump_pending = 1; | |
650 | lttng_ust_sockinfo_session_enabled(session->owner); | |
651 | return 0; | |
652 | } | |
53569322 | 653 | |
7dd08bec | 654 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
655 | { |
656 | int ret = 0; | |
7dd08bec | 657 | struct lttng_channel *chan; |
32ce8569 | 658 | int notify_socket; |
8020ceb5 | 659 | |
8020ceb5 MD |
660 | if (session->active) { |
661 | ret = -EBUSY; | |
662 | goto end; | |
663 | } | |
664 | ||
32ce8569 MD |
665 | notify_socket = lttng_get_notify_socket(session->owner); |
666 | if (notify_socket < 0) | |
667 | return notify_socket; | |
668 | ||
ac6b4ac6 MD |
669 | /* Set transient enabler state to "enabled" */ |
670 | session->tstate = 1; | |
e58095ef | 671 | |
3ff7660f | 672 | /* We need to sync enablers with session before activation. */ |
d871c65b | 673 | lttng_session_sync_event_enablers(session); |
3ff7660f | 674 | |
8020ceb5 MD |
675 | /* |
676 | * Snapshot the number of events per channel to know the type of header | |
677 | * we need to use. | |
678 | */ | |
e58095ef | 679 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 680 | const struct lttng_ctx *ctx; |
83e43212 | 681 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 682 | size_t nr_fields = 0; |
6ca18e66 | 683 | uint32_t chan_id; |
32ce8569 MD |
684 | |
685 | /* don't change it if session stop/restart */ | |
8020ceb5 | 686 | if (chan->header_type) |
32ce8569 MD |
687 | continue; |
688 | ctx = chan->ctx; | |
689 | if (ctx) { | |
690 | nr_fields = ctx->nr_fields; | |
83e43212 | 691 | fields = ctx->fields; |
53569322 MD |
692 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
693 | session); | |
694 | if (ret < 0) { | |
695 | DBG("Error (%d) adding enum to session", ret); | |
696 | return ret; | |
697 | } | |
32ce8569 MD |
698 | } |
699 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 700 | session, |
32ce8569 | 701 | session->objd, |
bb84a1ec | 702 | chan->parent.objd, |
32ce8569 MD |
703 | nr_fields, |
704 | fields, | |
6ca18e66 | 705 | &chan_id, |
32ce8569 | 706 | &chan->header_type); |
b869b5ae MD |
707 | if (ret) { |
708 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 709 | return ret; |
b869b5ae | 710 | } |
6ca18e66 MD |
711 | if (chan_id != chan->id) { |
712 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
713 | chan_id, chan->id); | |
714 | return -EINVAL; | |
715 | } | |
8020ceb5 MD |
716 | } |
717 | ||
ac6b4ac6 | 718 | /* Set atomically the state to "active" */ |
b5234c06 MD |
719 | CMM_ACCESS_ONCE(session->active) = 1; |
720 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 721 | |
710b8ee3 MD |
722 | ret = lttng_session_statedump(session); |
723 | if (ret) | |
724 | return ret; | |
8020ceb5 | 725 | end: |
8020ceb5 MD |
726 | return ret; |
727 | } | |
728 | ||
7dd08bec | 729 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
730 | { |
731 | int ret = 0; | |
732 | ||
8020ceb5 MD |
733 | if (!session->active) { |
734 | ret = -EBUSY; | |
735 | goto end; | |
736 | } | |
ac6b4ac6 | 737 | /* Set atomically the state to "inactive" */ |
b5234c06 | 738 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
739 | |
740 | /* Set transient enabler state to "disabled" */ | |
741 | session->tstate = 0; | |
d871c65b | 742 | lttng_session_sync_event_enablers(session); |
8020ceb5 | 743 | end: |
8020ceb5 MD |
744 | return ret; |
745 | } | |
746 | ||
bb84a1ec | 747 | int lttng_event_container_enable(struct lttng_event_container *container) |
976fe9ea | 748 | { |
ac6b4ac6 | 749 | int ret = 0; |
976fe9ea | 750 | |
bb84a1ec | 751 | if (container->enabled) { |
ac6b4ac6 MD |
752 | ret = -EBUSY; |
753 | goto end; | |
754 | } | |
755 | /* Set transient enabler state to "enabled" */ | |
bb84a1ec MD |
756 | container->tstate = 1; |
757 | lttng_session_sync_event_enablers(container->session); | |
758 | /* Atomically set the state to "enabled" */ | |
759 | switch (container->type) { | |
760 | case LTTNG_EVENT_CONTAINER_CHANNEL: | |
761 | { | |
762 | struct lttng_channel *channel = caa_container_of(container, | |
763 | struct lttng_channel, parent); | |
764 | ||
765 | CMM_ACCESS_ONCE(channel->enabled) = 1; /* Backward compatibility */ | |
766 | break; | |
767 | } | |
768 | default: | |
769 | break; | |
770 | } | |
771 | CMM_ACCESS_ONCE(container->enabled) = 1; | |
ac6b4ac6 MD |
772 | end: |
773 | return ret; | |
976fe9ea MD |
774 | } |
775 | ||
bb84a1ec | 776 | int lttng_event_container_disable(struct lttng_event_container *container) |
976fe9ea | 777 | { |
ac6b4ac6 | 778 | int ret = 0; |
976fe9ea | 779 | |
bb84a1ec | 780 | if (!container->enabled) { |
ac6b4ac6 MD |
781 | ret = -EBUSY; |
782 | goto end; | |
783 | } | |
bb84a1ec MD |
784 | /* Atomically set the state to "disabled" */ |
785 | CMM_ACCESS_ONCE(container->enabled) = 0; | |
786 | switch (container->type) { | |
787 | case LTTNG_EVENT_CONTAINER_CHANNEL: | |
788 | { | |
789 | struct lttng_channel *channel = caa_container_of(container, | |
790 | struct lttng_channel, parent); | |
791 | ||
792 | CMM_ACCESS_ONCE(channel->enabled) = 0; /* Backward compatibility */ | |
793 | break; | |
794 | } | |
795 | default: | |
796 | break; | |
797 | } | |
ac6b4ac6 | 798 | /* Set transient enabler state to "enabled" */ |
bb84a1ec MD |
799 | container->tstate = 0; |
800 | lttng_session_sync_event_enablers(container->session); | |
ac6b4ac6 MD |
801 | end: |
802 | return ret; | |
976fe9ea MD |
803 | } |
804 | ||
fb470188 FD |
805 | static inline |
806 | struct cds_hlist_head *borrow_hash_table_bucket( | |
807 | struct cds_hlist_head *hash_table, | |
808 | unsigned int hash_table_size, | |
bb84a1ec | 809 | const char *name) |
fb470188 | 810 | { |
fb470188 FD |
811 | size_t name_len; |
812 | uint32_t hash; | |
813 | ||
bb84a1ec | 814 | name_len = strlen(name); |
fb470188 | 815 | |
bb84a1ec | 816 | hash = jhash(name, name_len, 0); |
fb470188 FD |
817 | return &hash_table[hash & (hash_table_size - 1)]; |
818 | } | |
819 | ||
bb84a1ec MD |
820 | static |
821 | int format_event_key(char *key_string, const struct lttng_counter_key *key, | |
822 | const char *full_name) | |
823 | { | |
824 | const struct lttng_counter_key_dimension *dim; | |
825 | size_t i, left = LTTNG_KEY_TOKEN_STRING_LEN_MAX; | |
826 | char buf[LTTNG_UST_SYM_NAME_LEN]; | |
827 | const char *provider_name, *event_name; | |
828 | ||
829 | if (lttng_split_provider_event_name(full_name, buf, &provider_name, &event_name)) | |
830 | return -EINVAL; | |
831 | key_string[0] = '\0'; | |
832 | if (!key || !key->nr_dimensions) | |
833 | return 0; | |
834 | /* Currently event keys can only be specified on a single dimension. */ | |
835 | if (key->nr_dimensions != 1) | |
836 | return -EINVAL; | |
837 | dim = &key->key_dimensions[0]; | |
838 | for (i = 0; i < dim->nr_key_tokens; i++) { | |
839 | const struct lttng_key_token *token = &dim->key_tokens[i]; | |
840 | size_t token_len; | |
841 | const char *str; | |
842 | ||
843 | switch (token->type) { | |
844 | case LTTNG_KEY_TOKEN_STRING: | |
845 | str = token->arg.string; | |
846 | break; | |
847 | case LTTNG_KEY_TOKEN_EVENT_NAME: | |
848 | str = event_name; | |
849 | break; | |
850 | case LTTNG_KEY_TOKEN_PROVIDER_NAME: | |
851 | str = provider_name; | |
852 | break; | |
853 | default: | |
854 | return -EINVAL; | |
855 | } | |
856 | token_len = strlen(str); | |
857 | if (token_len >= left) | |
858 | return -EINVAL; | |
859 | strcat(key_string, str); | |
860 | left -= token_len; | |
861 | } | |
862 | return 0; | |
863 | } | |
864 | ||
865 | static | |
866 | bool match_event_token(struct lttng_event_container *container, | |
867 | struct lttng_event *event, uint64_t token) | |
868 | { | |
869 | if (container->coalesce_hits) | |
870 | return true; | |
871 | if (event->user_token == token) | |
872 | return true; | |
873 | return false; | |
874 | } | |
875 | ||
8020ceb5 MD |
876 | /* |
877 | * Supports event creation while tracing session is active. | |
878 | */ | |
e58095ef | 879 | static |
bb84a1ec MD |
880 | int lttng_event_create(struct lttng_event_enabler *event_enabler, |
881 | const struct lttng_event_desc *event_desc, | |
882 | const struct lttng_counter_key *key) | |
8020ceb5 | 883 | { |
bb84a1ec | 884 | struct lttng_event_container *container = event_enabler->container; |
7dd08bec | 885 | struct lttng_event *event; |
bb84a1ec MD |
886 | struct lttng_session *session = container->session; |
887 | const char *event_name; | |
888 | struct cds_hlist_head *name_head; | |
889 | char key_string[LTTNG_KEY_TOKEN_STRING_LEN_MAX]; | |
576599a0 | 890 | int ret = 0; |
32ce8569 MD |
891 | int notify_socket, loglevel; |
892 | const char *uri; | |
8020ceb5 | 893 | |
bb84a1ec MD |
894 | event_name = event_desc->name; |
895 | if (format_event_key(key_string, key, event_name)) { | |
896 | ret = -EINVAL; | |
897 | goto type_error; | |
898 | } | |
899 | ||
900 | name_head = borrow_hash_table_bucket(session->events_name_ht.table, | |
901 | LTTNG_UST_EVENT_HT_SIZE, event_name); | |
902 | cds_hlist_for_each_entry_2(event, name_head, name_hlist) { | |
903 | bool same_event = false, same_container = false, same_key = false, | |
904 | same_token = false; | |
905 | ||
906 | WARN_ON_ONCE(!event->desc); | |
907 | if (event_desc) { | |
908 | if (event->desc == event_desc) | |
909 | same_event = true; | |
910 | } else { | |
911 | if (!strcmp(event_name, event->desc->name)) | |
912 | same_event = true; | |
913 | } | |
914 | if (container == event->container) { | |
915 | same_container = true; | |
916 | if (match_event_token(container, event, | |
917 | event_enabler->base.user_token)) | |
918 | same_token = true; | |
919 | } | |
920 | if (key_string[0] == '\0' || !strcmp(key_string, event->key)) | |
921 | same_key = true; | |
922 | if (same_event && same_container && same_key && same_token) { | |
923 | ret = -EEXIST; | |
924 | goto exist; | |
925 | } | |
926 | } | |
457a6b58 | 927 | |
32ce8569 MD |
928 | notify_socket = lttng_get_notify_socket(session->owner); |
929 | if (notify_socket < 0) { | |
930 | ret = notify_socket; | |
931 | goto socket_error; | |
932 | } | |
933 | ||
bb84a1ec | 934 | ret = lttng_create_all_event_enums(event_desc->nr_fields, event_desc->fields, |
53569322 | 935 | session); |
c785c634 MD |
936 | if (ret < 0) { |
937 | DBG("Error (%d) adding enum to session", ret); | |
938 | goto create_enum_error; | |
939 | } | |
940 | ||
457a6b58 MD |
941 | /* |
942 | * Check if loglevel match. Refuse to connect event if not. | |
943 | */ | |
7dd08bec | 944 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
945 | if (!event) { |
946 | ret = -ENOMEM; | |
8020ceb5 | 947 | goto cache_error; |
576599a0 | 948 | } |
bb84a1ec MD |
949 | /* for backward compatibility */ |
950 | event->chan = lttng_event_container_get_channel(container); | |
e58095ef | 951 | |
ac6b4ac6 MD |
952 | /* Event will be enabled by enabler sync. */ |
953 | event->enabled = 0; | |
954 | event->registered = 0; | |
a56fd376 | 955 | CDS_INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
e58095ef | 956 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); |
bb84a1ec MD |
957 | event->desc = event_desc; |
958 | event->container = container; | |
959 | strcpy(event->key, key_string); | |
960 | if (!container->coalesce_hits) | |
961 | event->user_token = event_enabler->base.user_token; | |
32ce8569 | 962 | |
bb84a1ec | 963 | if (event_desc->loglevel) |
32ce8569 MD |
964 | loglevel = *(*event->desc->loglevel); |
965 | else | |
966 | loglevel = TRACE_DEFAULT; | |
bb84a1ec MD |
967 | if (event_desc->u.ext.model_emf_uri) |
968 | uri = *(event_desc->u.ext.model_emf_uri); | |
32ce8569 MD |
969 | else |
970 | uri = NULL; | |
971 | ||
13b21cd6 MD |
972 | /* Fetch event ID from sessiond */ |
973 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 974 | session, |
13b21cd6 | 975 | session->objd, |
bb84a1ec MD |
976 | container->objd, |
977 | event_desc->name, | |
13b21cd6 | 978 | loglevel, |
bb84a1ec MD |
979 | event_desc->signature, |
980 | event_desc->nr_fields, | |
981 | event_desc->fields, | |
13b21cd6 | 982 | uri, |
bb84a1ec MD |
983 | event_enabler->base.user_token, |
984 | &event->id, | |
985 | &event->counter_index); | |
13b21cd6 MD |
986 | if (ret < 0) { |
987 | DBG("Error (%d) registering event to sessiond", ret); | |
988 | goto sessiond_register_error; | |
32ce8569 | 989 | } |
2b213b16 | 990 | |
bb84a1ec MD |
991 | cds_list_add(&event->node, &session->events_head); |
992 | cds_hlist_add_head(&event->name_hlist, name_head); | |
576599a0 | 993 | return 0; |
8020ceb5 | 994 | |
32ce8569 | 995 | sessiond_register_error: |
b5234c06 | 996 | free(event); |
8020ceb5 | 997 | cache_error: |
c785c634 | 998 | create_enum_error: |
32ce8569 | 999 | socket_error: |
bb84a1ec MD |
1000 | exist: |
1001 | type_error: | |
576599a0 | 1002 | return ret; |
8020ceb5 MD |
1003 | } |
1004 | ||
d8d2416d FD |
1005 | static |
1006 | int lttng_event_notifier_create(const struct lttng_event_desc *desc, | |
6566528b | 1007 | uint64_t token, uint64_t error_counter_index, |
d8d2416d FD |
1008 | struct lttng_event_notifier_group *event_notifier_group) |
1009 | { | |
1010 | struct lttng_event_notifier *event_notifier; | |
1011 | struct cds_hlist_head *head; | |
1012 | int ret = 0; | |
1013 | ||
1014 | /* | |
1015 | * Get the hashtable bucket the created lttng_event_notifier object | |
1016 | * should be inserted. | |
1017 | */ | |
1018 | head = borrow_hash_table_bucket( | |
1019 | event_notifier_group->event_notifiers_ht.table, | |
bb84a1ec | 1020 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc->name); |
d8d2416d FD |
1021 | |
1022 | event_notifier = zmalloc(sizeof(struct lttng_event_notifier)); | |
1023 | if (!event_notifier) { | |
1024 | ret = -ENOMEM; | |
1025 | goto error; | |
1026 | } | |
1027 | ||
1028 | event_notifier->group = event_notifier_group; | |
1029 | event_notifier->user_token = token; | |
6566528b | 1030 | event_notifier->error_counter_index = error_counter_index; |
d8d2416d FD |
1031 | |
1032 | /* Event notifier will be enabled by enabler sync. */ | |
1033 | event_notifier->enabled = 0; | |
1034 | event_notifier->registered = 0; | |
1035 | ||
1036 | CDS_INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); | |
d37ecb3f | 1037 | CDS_INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head); |
d8d2416d FD |
1038 | CDS_INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
1039 | event_notifier->desc = desc; | |
cab88ff8 | 1040 | event_notifier->notification_send = lttng_event_notifier_notification_send; |
d8d2416d FD |
1041 | |
1042 | cds_list_add(&event_notifier->node, | |
1043 | &event_notifier_group->event_notifiers_head); | |
1044 | cds_hlist_add_head(&event_notifier->hlist, head); | |
1045 | ||
1046 | return 0; | |
1047 | ||
1048 | error: | |
1049 | return ret; | |
1050 | } | |
1051 | ||
1052 | static | |
1053 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
1054 | { | |
1055 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1056 | ||
1057 | /* Remove from event_notifier list. */ | |
1058 | cds_list_del(&event_notifier->node); | |
1059 | /* Remove from event_notifier hash table. */ | |
1060 | cds_hlist_del(&event_notifier->hlist); | |
1061 | ||
1062 | lttng_free_event_notifier_filter_runtime(event_notifier); | |
1063 | ||
1064 | /* Free event_notifier enabler refs */ | |
1065 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1066 | &event_notifier->enablers_ref_head, node) | |
1067 | free(enabler_ref); | |
1068 | free(event_notifier); | |
1069 | } | |
1070 | ||
e58095ef | 1071 | static |
196ec2df | 1072 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
1073 | struct lttng_enabler *enabler) |
1074 | { | |
1075 | int loglevel = 0; | |
7e2e405c | 1076 | unsigned int has_loglevel = 0; |
e58095ef | 1077 | |
e450e339 | 1078 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f6f42e6 MD |
1079 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
1080 | desc->name, SIZE_MAX)) | |
e58095ef MD |
1081 | return 0; |
1082 | if (desc->loglevel) { | |
1083 | loglevel = *(*desc->loglevel); | |
1084 | has_loglevel = 1; | |
1085 | } | |
1086 | if (!lttng_loglevel_match(loglevel, | |
1087 | has_loglevel, | |
1088 | enabler->event_param.loglevel_type, | |
1089 | enabler->event_param.loglevel)) | |
1090 | return 0; | |
1091 | return 1; | |
1092 | } | |
1093 | ||
1094 | static | |
1095 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
1096 | struct lttng_enabler *enabler) | |
1097 | { | |
1098 | int loglevel = 0; | |
1099 | unsigned int has_loglevel = 0; | |
1100 | ||
e450e339 | 1101 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
e58095ef MD |
1102 | if (strcmp(desc->name, enabler->event_param.name)) |
1103 | return 0; | |
1104 | if (desc->loglevel) { | |
1105 | loglevel = *(*desc->loglevel); | |
1106 | has_loglevel = 1; | |
1107 | } | |
1108 | if (!lttng_loglevel_match(loglevel, | |
1109 | has_loglevel, | |
1110 | enabler->event_param.loglevel_type, | |
1111 | enabler->event_param.loglevel)) | |
1112 | return 0; | |
1113 | return 1; | |
1114 | } | |
1115 | ||
1116 | static | |
1117 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
1118 | struct lttng_enabler *enabler) | |
1119 | { | |
e450e339 FD |
1120 | switch (enabler->format_type) { |
1121 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
196ec2df PP |
1122 | { |
1123 | struct lttng_ust_excluder_node *excluder; | |
1124 | ||
1125 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
1126 | return 0; | |
1127 | } | |
1128 | ||
1129 | /* | |
1130 | * If the matching event matches with an excluder, | |
1131 | * return 'does not match' | |
1132 | */ | |
1133 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
1134 | int count; | |
1135 | ||
1136 | for (count = 0; count < excluder->excluder.count; count++) { | |
1137 | int len; | |
1138 | char *excluder_name; | |
1139 | ||
1140 | excluder_name = (char *) (excluder->excluder.names) | |
1141 | + count * LTTNG_UST_SYM_NAME_LEN; | |
1142 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 1143 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 1144 | return 0; |
ed5b5bbd JI |
1145 | } |
1146 | } | |
196ec2df | 1147 | return 1; |
ed5b5bbd | 1148 | } |
e450e339 | 1149 | case LTTNG_ENABLER_FORMAT_EVENT: |
e58095ef MD |
1150 | return lttng_desc_match_event_enabler(desc, enabler); |
1151 | default: | |
1152 | return -EINVAL; | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | static | |
bb84a1ec | 1157 | bool lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
d871c65b | 1158 | struct lttng_event *event) |
e58095ef | 1159 | { |
d871c65b | 1160 | if (lttng_desc_match_enabler(event->desc, |
bb84a1ec MD |
1161 | lttng_event_enabler_as_enabler(event_enabler)) > 0 |
1162 | && event->container == event_enabler->container | |
1163 | && match_event_token(event->container, event, event_enabler->base.user_token)) | |
1164 | return true; | |
d970f72e | 1165 | else |
bb84a1ec | 1166 | return false; |
e58095ef MD |
1167 | } |
1168 | ||
d8d2416d FD |
1169 | static |
1170 | int lttng_event_notifier_enabler_match_event_notifier( | |
1171 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1172 | struct lttng_event_notifier *event_notifier) | |
1173 | { | |
bb84a1ec MD |
1174 | bool desc_matches = lttng_desc_match_enabler(event_notifier->desc, |
1175 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)) > 0; | |
d8d2416d FD |
1176 | |
1177 | if (desc_matches && event_notifier->group == event_notifier_enabler->group && | |
bb84a1ec | 1178 | event_notifier->user_token == event_notifier_enabler->base.user_token) |
d8d2416d FD |
1179 | return 1; |
1180 | else | |
1181 | return 0; | |
1182 | } | |
1183 | ||
e58095ef | 1184 | static |
d871c65b FD |
1185 | struct lttng_enabler_ref *lttng_enabler_ref( |
1186 | struct cds_list_head *enabler_ref_list, | |
e58095ef MD |
1187 | struct lttng_enabler *enabler) |
1188 | { | |
1189 | struct lttng_enabler_ref *enabler_ref; | |
1190 | ||
d871c65b | 1191 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
e58095ef MD |
1192 | if (enabler_ref->ref == enabler) |
1193 | return enabler_ref; | |
1194 | } | |
1195 | return NULL; | |
1196 | } | |
1197 | ||
8020ceb5 | 1198 | /* |
e58095ef MD |
1199 | * Create struct lttng_event if it is missing and present in the list of |
1200 | * tracepoint probes. | |
8020ceb5 | 1201 | */ |
e58095ef | 1202 | static |
d871c65b | 1203 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1204 | { |
e58095ef MD |
1205 | struct lttng_probe_desc *probe_desc; |
1206 | const struct lttng_event_desc *desc; | |
e58095ef MD |
1207 | int i; |
1208 | struct cds_list_head *probe_list; | |
1209 | ||
1210 | probe_list = lttng_get_probe_list_head(); | |
1211 | /* | |
1212 | * For each probe event, if we find that a probe event matches | |
1213 | * our enabler, create an associated lttng_event if not | |
1214 | * already present. | |
1215 | */ | |
1216 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1217 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 | 1218 | int ret; |
e58095ef MD |
1219 | |
1220 | desc = probe_desc->event_desc[i]; | |
bb84a1ec MD |
1221 | if (lttng_desc_match_enabler(desc, |
1222 | lttng_event_enabler_as_enabler(event_enabler)) <= 0) | |
e58095ef MD |
1223 | continue; |
1224 | ||
bb84a1ec MD |
1225 | /* Try to create an event for this event probe. */ |
1226 | ret = lttng_event_create(event_enabler, | |
1227 | probe_desc->event_desc[i], | |
1228 | &event_enabler->key); | |
1229 | /* Skip if event is already found. */ | |
1230 | if (ret == -EEXIST) | |
e58095ef | 1231 | continue; |
e58095ef | 1232 | if (ret) { |
32ce8569 MD |
1233 | DBG("Unable to create event %s, error %d\n", |
1234 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 1235 | } |
8165c8da | 1236 | } |
8020ceb5 | 1237 | } |
8020ceb5 MD |
1238 | } |
1239 | ||
a44d07da FD |
1240 | static |
1241 | void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc, | |
d8d2416d FD |
1242 | void (*event_func)(struct lttng_session *session, |
1243 | struct lttng_event *event), | |
1244 | void (*event_notifier_func)(struct lttng_event_notifier *event_notifier)) | |
35ac38cb FD |
1245 | { |
1246 | struct cds_hlist_node *node, *tmp_node; | |
1247 | struct cds_list_head *sessionsp; | |
a44d07da | 1248 | unsigned int i; |
35ac38cb FD |
1249 | |
1250 | /* Get handle on list of sessions. */ | |
1251 | sessionsp = _lttng_get_sessions(); | |
1252 | ||
1253 | /* | |
a44d07da FD |
1254 | * Iterate over all events in the probe provider descriptions and |
1255 | * sessions to queue the unregistration of the events. | |
35ac38cb FD |
1256 | */ |
1257 | for (i = 0; i < provider_desc->nr_events; i++) { | |
1258 | const struct lttng_event_desc *event_desc; | |
d8d2416d FD |
1259 | struct lttng_event_notifier_group *event_notifier_group; |
1260 | struct lttng_event_notifier *event_notifier; | |
a44d07da FD |
1261 | struct lttng_session *session; |
1262 | struct cds_hlist_head *head; | |
1263 | struct lttng_event *event; | |
35ac38cb FD |
1264 | |
1265 | event_desc = provider_desc->event_desc[i]; | |
35ac38cb | 1266 | |
a44d07da FD |
1267 | /* |
1268 | * Iterate over all session to find the current event | |
1269 | * description. | |
1270 | */ | |
35ac38cb FD |
1271 | cds_list_for_each_entry(session, sessionsp, node) { |
1272 | /* | |
a44d07da FD |
1273 | * Get the list of events in the hashtable bucket and |
1274 | * iterate to find the event matching this descriptor. | |
35ac38cb | 1275 | */ |
fb470188 | 1276 | head = borrow_hash_table_bucket( |
bb84a1ec MD |
1277 | session->events_name_ht.table, |
1278 | LTTNG_UST_EVENT_HT_SIZE, event_desc->name); | |
fb470188 | 1279 | |
bb84a1ec | 1280 | cds_hlist_for_each_entry_safe(event, node, tmp_node, head, name_hlist) { |
35ac38cb | 1281 | if (event_desc == event->desc) { |
a44d07da | 1282 | event_func(session, event); |
35ac38cb FD |
1283 | break; |
1284 | } | |
1285 | } | |
1286 | } | |
d8d2416d FD |
1287 | |
1288 | /* | |
1289 | * Iterate over all event_notifier groups to find the current event | |
1290 | * description. | |
1291 | */ | |
1292 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1293 | /* | |
1294 | * Get the list of event_notifiers in the hashtable bucket and | |
1295 | * iterate to find the event_notifier matching this | |
1296 | * descriptor. | |
1297 | */ | |
1298 | head = borrow_hash_table_bucket( | |
1299 | event_notifier_group->event_notifiers_ht.table, | |
bb84a1ec | 1300 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, event_desc->name); |
d8d2416d FD |
1301 | |
1302 | cds_hlist_for_each_entry_safe(event_notifier, node, tmp_node, head, hlist) { | |
1303 | if (event_desc == event_notifier->desc) { | |
1304 | event_notifier_func(event_notifier); | |
1305 | break; | |
1306 | } | |
1307 | } | |
1308 | } | |
35ac38cb | 1309 | } |
a44d07da FD |
1310 | } |
1311 | ||
1312 | static | |
1313 | void _unregister_event(struct lttng_session *session, | |
1314 | struct lttng_event *event) | |
1315 | { | |
1316 | _lttng_event_unregister(event); | |
1317 | } | |
1318 | ||
1319 | static | |
1320 | void _event_enum_destroy(struct lttng_session *session, | |
1321 | struct lttng_event *event) | |
1322 | { | |
1323 | unsigned int i; | |
1324 | ||
1325 | /* Destroy enums of the current event. */ | |
1326 | for (i = 0; i < event->desc->nr_fields; i++) { | |
1327 | const struct lttng_enum_desc *enum_desc; | |
1328 | const struct lttng_event_field *field; | |
1329 | struct lttng_enum *curr_enum; | |
1330 | ||
1331 | field = &(event->desc->fields[i]); | |
1332 | switch (field->type.atype) { | |
1333 | case atype_enum: | |
1334 | enum_desc = field->type.u.legacy.basic.enumeration.desc; | |
1335 | break; | |
1336 | case atype_enum_nestable: | |
1337 | enum_desc = field->type.u.enum_nestable.desc; | |
1338 | break; | |
1339 | default: | |
1340 | continue; | |
1341 | } | |
1342 | ||
1343 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); | |
1344 | if (curr_enum) { | |
1345 | _lttng_enum_destroy(curr_enum); | |
1346 | } | |
1347 | } | |
1348 | ||
1349 | /* Destroy event. */ | |
1350 | _lttng_event_destroy(event); | |
1351 | } | |
1352 | ||
1353 | /* | |
1354 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
1355 | * the probe provider descriptor received as argument. Must me called with the | |
1356 | * ust_lock held. | |
1357 | */ | |
1358 | void lttng_probe_provider_unregister_events( | |
1359 | struct lttng_probe_desc *provider_desc) | |
1360 | { | |
1361 | /* | |
1362 | * Iterate over all events in the probe provider descriptions and sessions | |
1363 | * to queue the unregistration of the events. | |
1364 | */ | |
d8d2416d FD |
1365 | probe_provider_event_for_each(provider_desc, _unregister_event, |
1366 | _lttng_event_notifier_unregister); | |
35ac38cb FD |
1367 | |
1368 | /* Wait for grace period. */ | |
10544ee8 | 1369 | lttng_ust_synchronize_trace(); |
35ac38cb FD |
1370 | /* Prune the unregistration queue. */ |
1371 | __tracepoint_probe_prune_release_queue(); | |
1372 | ||
1373 | /* | |
1374 | * It is now safe to destroy the events and remove them from the event list | |
1375 | * and hashtables. | |
1376 | */ | |
d8d2416d FD |
1377 | probe_provider_event_for_each(provider_desc, _event_enum_destroy, |
1378 | _lttng_event_notifier_destroy); | |
35ac38cb FD |
1379 | } |
1380 | ||
8020ceb5 | 1381 | /* |
d8d2416d | 1382 | * Create events associated with an event enabler (if not already present), |
e58095ef | 1383 | * and add backward reference from the event to the enabler. |
8020ceb5 MD |
1384 | */ |
1385 | static | |
d871c65b | 1386 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1387 | { |
bb84a1ec | 1388 | struct lttng_session *session = event_enabler->container->session; |
e58095ef MD |
1389 | struct lttng_event *event; |
1390 | ||
d871c65b | 1391 | if (!lttng_event_enabler_as_enabler(event_enabler)->enabled) |
de713d8a FD |
1392 | goto end; |
1393 | ||
e58095ef | 1394 | /* First ensure that probe events are created for this enabler. */ |
d871c65b | 1395 | lttng_create_event_if_missing(event_enabler); |
e58095ef MD |
1396 | |
1397 | /* For each event matching enabler in session event list. */ | |
1398 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1399 | struct lttng_enabler_ref *enabler_ref; | |
1400 | ||
d871c65b | 1401 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
e58095ef MD |
1402 | continue; |
1403 | ||
d871c65b FD |
1404 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
1405 | lttng_event_enabler_as_enabler(event_enabler)); | |
e58095ef MD |
1406 | if (!enabler_ref) { |
1407 | /* | |
1408 | * If no backward ref, create it. | |
1409 | * Add backward ref from event to enabler. | |
1410 | */ | |
1411 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1412 | if (!enabler_ref) | |
1413 | return -ENOMEM; | |
d871c65b FD |
1414 | enabler_ref->ref = lttng_event_enabler_as_enabler( |
1415 | event_enabler); | |
e58095ef MD |
1416 | cds_list_add(&enabler_ref->node, |
1417 | &event->enablers_ref_head); | |
8165c8da | 1418 | } |
e58095ef MD |
1419 | |
1420 | /* | |
1421 | * Link filter bytecodes if not linked yet. | |
1422 | */ | |
53b9d7db FD |
1423 | lttng_enabler_link_bytecode(event->desc, |
1424 | &session->ctx, | |
a56fd376 | 1425 | &event->filter_bytecode_runtime_head, |
621c07fc | 1426 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
e58095ef MD |
1427 | |
1428 | /* TODO: merge event context. */ | |
1429 | } | |
de713d8a | 1430 | end: |
e58095ef MD |
1431 | return 0; |
1432 | } | |
1433 | ||
1434 | /* | |
1435 | * Called at library load: connect the probe on all enablers matching | |
1436 | * this event. | |
5f733922 | 1437 | * Called with session mutex held. |
e58095ef | 1438 | */ |
5f733922 | 1439 | int lttng_fix_pending_events(void) |
e58095ef MD |
1440 | { |
1441 | struct lttng_session *session; | |
1442 | ||
1443 | cds_list_for_each_entry(session, &sessions, node) { | |
d871c65b | 1444 | lttng_session_lazy_sync_event_enablers(session); |
8020ceb5 | 1445 | } |
e58095ef MD |
1446 | return 0; |
1447 | } | |
1448 | ||
d8d2416d FD |
1449 | int lttng_fix_pending_event_notifiers(void) |
1450 | { | |
1451 | struct lttng_event_notifier_group *event_notifier_group; | |
1452 | ||
1453 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1454 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1455 | } | |
1456 | return 0; | |
1457 | } | |
1458 | ||
246be17e | 1459 | /* |
37dddb65 MD |
1460 | * For each session of the owner thread, execute pending statedump. |
1461 | * Only dump state for the sessions owned by the caller thread, because | |
1462 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 1463 | */ |
3327ac33 | 1464 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
1465 | { |
1466 | struct lttng_session *session; | |
1467 | ||
37dddb65 | 1468 | /* Execute state dump */ |
cf73e0fe | 1469 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
1470 | |
1471 | /* Clear pending state dump */ | |
3327ac33 MD |
1472 | if (ust_lock()) { |
1473 | goto end; | |
1474 | } | |
246be17e | 1475 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
1476 | if (session->owner != owner) |
1477 | continue; | |
1478 | if (!session->statedump_pending) | |
1479 | continue; | |
1480 | session->statedump_pending = 0; | |
246be17e | 1481 | } |
3327ac33 | 1482 | end: |
37dddb65 | 1483 | ust_unlock(); |
3327ac33 | 1484 | return; |
246be17e PW |
1485 | } |
1486 | ||
e58095ef MD |
1487 | /* |
1488 | * Only used internally at session destruction. | |
1489 | */ | |
1490 | static | |
1491 | void _lttng_event_destroy(struct lttng_event *event) | |
1492 | { | |
1493 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1494 | ||
35ac38cb | 1495 | /* Remove from event list. */ |
e58095ef | 1496 | cds_list_del(&event->node); |
35ac38cb | 1497 | /* Remove from event hash table. */ |
bb84a1ec | 1498 | cds_hlist_del(&event->name_hlist); |
35ac38cb | 1499 | |
8020ceb5 | 1500 | lttng_destroy_context(event->ctx); |
f488575f | 1501 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1502 | /* Free event enabler refs */ |
1503 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1504 | &event->enablers_ref_head, node) | |
1505 | free(enabler_ref); | |
b5234c06 | 1506 | free(event); |
8020ceb5 MD |
1507 | } |
1508 | ||
c785c634 MD |
1509 | static |
1510 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1511 | { | |
1512 | cds_list_del(&_enum->node); | |
35ac38cb | 1513 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1514 | free(_enum); |
1515 | } | |
1516 | ||
003fedf4 | 1517 | void lttng_ust_events_exit(void) |
8020ceb5 | 1518 | { |
7dd08bec | 1519 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1520 | |
e58095ef | 1521 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1522 | lttng_session_destroy(session); |
8020ceb5 | 1523 | } |
457a6b58 | 1524 | |
bb84a1ec MD |
1525 | static |
1526 | int copy_counter_key(struct lttng_counter_key *key, | |
1527 | const struct lttng_ust_counter_key *key_param) | |
1528 | { | |
1529 | size_t i, j, nr_dimensions; | |
1530 | ||
1531 | nr_dimensions = key_param->nr_dimensions; | |
1532 | if (nr_dimensions > LTTNG_COUNTER_DIMENSION_MAX) | |
1533 | return -EINVAL; | |
1534 | key->nr_dimensions = nr_dimensions; | |
1535 | for (i = 0; i < nr_dimensions; i++) { | |
1536 | const struct lttng_ust_counter_key_dimension *udim = | |
1537 | &key_param->key_dimensions[i]; | |
1538 | struct lttng_counter_key_dimension *dim = | |
1539 | &key->key_dimensions[i]; | |
1540 | size_t nr_key_tokens; | |
1541 | ||
1542 | nr_key_tokens = udim->nr_key_tokens; | |
1543 | if (!nr_key_tokens || nr_key_tokens > LTTNG_NR_KEY_TOKEN) | |
1544 | return -EINVAL; | |
1545 | dim->nr_key_tokens = nr_key_tokens; | |
1546 | for (j = 0; j < nr_key_tokens; j++) { | |
1547 | const struct lttng_ust_key_token *utoken = | |
1548 | &udim->key_tokens[j]; | |
1549 | struct lttng_key_token *token = | |
1550 | &dim->key_tokens[j]; | |
1551 | ||
1552 | switch (utoken->type) { | |
1553 | case LTTNG_UST_KEY_TOKEN_STRING: | |
1554 | { | |
1555 | size_t len; | |
1556 | ||
1557 | token->type = LTTNG_KEY_TOKEN_STRING; | |
1558 | len = strnlen(utoken->arg.string, LTTNG_KEY_TOKEN_STRING_LEN_MAX); | |
1559 | if (!len || len >= LTTNG_KEY_TOKEN_STRING_LEN_MAX) | |
1560 | return -EINVAL; | |
1561 | strcpy(token->arg.string, utoken->arg.string); | |
1562 | break; | |
1563 | } | |
1564 | case LTTNG_UST_KEY_TOKEN_EVENT_NAME: | |
1565 | token->type = LTTNG_KEY_TOKEN_EVENT_NAME; | |
1566 | break; | |
1567 | case LTTNG_UST_KEY_TOKEN_PROVIDER_NAME: | |
1568 | token->type = LTTNG_KEY_TOKEN_PROVIDER_NAME; | |
1569 | break; | |
1570 | default: | |
1571 | return -EINVAL; | |
1572 | } | |
1573 | } | |
1574 | } | |
1575 | return 0; | |
1576 | } | |
1577 | ||
e58095ef MD |
1578 | /* |
1579 | * Enabler management. | |
1580 | */ | |
d871c65b FD |
1581 | struct lttng_event_enabler *lttng_event_enabler_create( |
1582 | enum lttng_enabler_format_type format_type, | |
e58095ef | 1583 | struct lttng_ust_event *event_param, |
bb84a1ec MD |
1584 | const struct lttng_ust_counter_key *key, |
1585 | struct lttng_event_container *container) | |
457a6b58 | 1586 | { |
d871c65b | 1587 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1588 | |
d871c65b FD |
1589 | event_enabler = zmalloc(sizeof(*event_enabler)); |
1590 | if (!event_enabler) | |
e58095ef | 1591 | return NULL; |
d871c65b | 1592 | event_enabler->base.format_type = format_type; |
bb84a1ec | 1593 | event_enabler->base.user_token = event_param->token; |
d871c65b FD |
1594 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); |
1595 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); | |
1596 | memcpy(&event_enabler->base.event_param, event_param, | |
1597 | sizeof(event_enabler->base.event_param)); | |
bb84a1ec MD |
1598 | event_enabler->container = container; |
1599 | if (key) { | |
1600 | if (copy_counter_key(&event_enabler->key, key)) | |
1601 | return NULL; | |
1602 | } | |
e58095ef | 1603 | /* ctx left NULL */ |
d871c65b | 1604 | event_enabler->base.enabled = 0; |
bb84a1ec MD |
1605 | cds_list_add(&event_enabler->node, &event_enabler->container->session->enablers_head); |
1606 | lttng_session_lazy_sync_event_enablers(event_enabler->container->session); | |
d871c65b FD |
1607 | |
1608 | return event_enabler; | |
457a6b58 MD |
1609 | } |
1610 | ||
d8d2416d FD |
1611 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
1612 | struct lttng_event_notifier_group *event_notifier_group, | |
1613 | enum lttng_enabler_format_type format_type, | |
1614 | struct lttng_ust_event_notifier *event_notifier_param) | |
1615 | { | |
1616 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1617 | ||
1618 | event_notifier_enabler = zmalloc(sizeof(*event_notifier_enabler)); | |
1619 | if (!event_notifier_enabler) | |
1620 | return NULL; | |
1621 | event_notifier_enabler->base.format_type = format_type; | |
1622 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
d37ecb3f | 1623 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
d8d2416d FD |
1624 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.excluder_head); |
1625 | ||
9560f5eb | 1626 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
d37ecb3f | 1627 | event_notifier_enabler->num_captures = 0; |
d8d2416d | 1628 | |
bb84a1ec | 1629 | event_notifier_enabler->base.user_token = event_notifier_param->event.token; |
d8d2416d FD |
1630 | memcpy(&event_notifier_enabler->base.event_param.name, |
1631 | event_notifier_param->event.name, | |
1632 | sizeof(event_notifier_enabler->base.event_param.name)); | |
1633 | event_notifier_enabler->base.event_param.instrumentation = | |
1634 | event_notifier_param->event.instrumentation; | |
1635 | event_notifier_enabler->base.event_param.loglevel = | |
1636 | event_notifier_param->event.loglevel; | |
1637 | event_notifier_enabler->base.event_param.loglevel_type = | |
1638 | event_notifier_param->event.loglevel_type; | |
1639 | ||
1640 | event_notifier_enabler->base.enabled = 0; | |
1641 | event_notifier_enabler->group = event_notifier_group; | |
1642 | ||
1643 | cds_list_add(&event_notifier_enabler->node, | |
1644 | &event_notifier_group->enablers_head); | |
1645 | ||
1646 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1647 | ||
1648 | return event_notifier_enabler; | |
1649 | } | |
1650 | ||
d871c65b | 1651 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1652 | { |
d871c65b | 1653 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
bb84a1ec | 1654 | lttng_session_lazy_sync_event_enablers(event_enabler->container->session); |
d871c65b | 1655 | |
e58095ef | 1656 | return 0; |
457a6b58 | 1657 | } |
457a6b58 | 1658 | |
d871c65b | 1659 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1660 | { |
d871c65b | 1661 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
bb84a1ec | 1662 | lttng_session_lazy_sync_event_enablers(event_enabler->container->session); |
d871c65b | 1663 | |
e58095ef MD |
1664 | return 0; |
1665 | } | |
457a6b58 | 1666 | |
d871c65b | 1667 | static |
a56fd376 | 1668 | void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
ab89263e | 1669 | struct lttng_ust_bytecode_node **bytecode) |
e58095ef | 1670 | { |
ab89263e MD |
1671 | (*bytecode)->enabler = enabler; |
1672 | cds_list_add_tail(&(*bytecode)->node, &enabler->filter_bytecode_head); | |
1673 | /* Take ownership of bytecode */ | |
1674 | *bytecode = NULL; | |
d871c65b FD |
1675 | } |
1676 | ||
a56fd376 | 1677 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
ab89263e | 1678 | struct lttng_ust_bytecode_node **bytecode) |
d871c65b | 1679 | { |
a56fd376 | 1680 | _lttng_enabler_attach_filter_bytecode( |
d871c65b FD |
1681 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
1682 | ||
bb84a1ec | 1683 | lttng_session_lazy_sync_event_enablers(event_enabler->container->session); |
e58095ef | 1684 | return 0; |
0bfb5cbd JI |
1685 | } |
1686 | ||
d871c65b FD |
1687 | static |
1688 | void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
e9fe6aad | 1689 | struct lttng_ust_excluder_node **excluder) |
0bfb5cbd | 1690 | { |
e9fe6aad MD |
1691 | (*excluder)->enabler = enabler; |
1692 | cds_list_add_tail(&(*excluder)->node, &enabler->excluder_head); | |
1693 | /* Take ownership of excluder */ | |
1694 | *excluder = NULL; | |
d871c65b FD |
1695 | } |
1696 | ||
1697 | int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler, | |
e9fe6aad | 1698 | struct lttng_ust_excluder_node **excluder) |
d871c65b FD |
1699 | { |
1700 | _lttng_enabler_attach_exclusion( | |
1701 | lttng_event_enabler_as_enabler(event_enabler), excluder); | |
1702 | ||
bb84a1ec | 1703 | lttng_session_lazy_sync_event_enablers(event_enabler->container->session); |
0bfb5cbd | 1704 | return 0; |
e58095ef | 1705 | } |
f488575f | 1706 | |
d8d2416d FD |
1707 | int lttng_event_notifier_enabler_enable( |
1708 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1709 | { | |
1710 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
1711 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1712 | ||
1713 | return 0; | |
1714 | } | |
1715 | ||
1716 | int lttng_event_notifier_enabler_disable( | |
1717 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1718 | { | |
1719 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
1720 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1721 | ||
1722 | return 0; | |
1723 | } | |
1724 | ||
a56fd376 | 1725 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
d8d2416d | 1726 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
ab89263e | 1727 | struct lttng_ust_bytecode_node **bytecode) |
d8d2416d | 1728 | { |
a56fd376 | 1729 | _lttng_enabler_attach_filter_bytecode( |
d8d2416d FD |
1730 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
1731 | bytecode); | |
1732 | ||
1733 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1734 | return 0; | |
1735 | } | |
1736 | ||
d37ecb3f FD |
1737 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
1738 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
49cde654 | 1739 | struct lttng_ust_bytecode_node **bytecode) |
d37ecb3f | 1740 | { |
49cde654 | 1741 | (*bytecode)->enabler = lttng_event_notifier_enabler_as_enabler( |
d37ecb3f | 1742 | event_notifier_enabler); |
49cde654 | 1743 | cds_list_add_tail(&(*bytecode)->node, |
d37ecb3f | 1744 | &event_notifier_enabler->capture_bytecode_head); |
49cde654 MD |
1745 | /* Take ownership of bytecode */ |
1746 | *bytecode = NULL; | |
d37ecb3f FD |
1747 | event_notifier_enabler->num_captures++; |
1748 | ||
1749 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1750 | return 0; | |
1751 | } | |
1752 | ||
d8d2416d FD |
1753 | int lttng_event_notifier_enabler_attach_exclusion( |
1754 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
e9fe6aad | 1755 | struct lttng_ust_excluder_node **excluder) |
d8d2416d FD |
1756 | { |
1757 | _lttng_enabler_attach_exclusion( | |
1758 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), | |
1759 | excluder); | |
1760 | ||
1761 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1762 | return 0; | |
1763 | } | |
1764 | ||
e58095ef | 1765 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1766 | union ust_args *uargs, |
e58095ef MD |
1767 | struct lttng_ctx **ctx, struct lttng_session *session) |
1768 | { | |
457a6b58 | 1769 | /* |
e58095ef MD |
1770 | * We cannot attach a context after trace has been started for a |
1771 | * session because the metadata does not allow expressing this | |
1772 | * information outside of the original channel scope. | |
457a6b58 | 1773 | */ |
e58095ef MD |
1774 | if (session->been_active) |
1775 | return -EPERM; | |
457a6b58 | 1776 | |
e58095ef MD |
1777 | switch (context_param->ctx) { |
1778 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1779 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1780 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1781 | { | |
1782 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1783 | ||
1784 | perf_ctx_param = &context_param->u.perf_counter; | |
1785 | return lttng_add_perf_counter_to_ctx( | |
1786 | perf_ctx_param->type, | |
1787 | perf_ctx_param->config, | |
1788 | perf_ctx_param->name, | |
1789 | ctx); | |
1790 | } | |
e58095ef MD |
1791 | case LTTNG_UST_CONTEXT_VTID: |
1792 | return lttng_add_vtid_to_ctx(ctx); | |
1793 | case LTTNG_UST_CONTEXT_VPID: | |
1794 | return lttng_add_vpid_to_ctx(ctx); | |
1795 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1796 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1797 | case LTTNG_UST_CONTEXT_IP: |
1798 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1799 | case LTTNG_UST_CONTEXT_CPU_ID: |
1800 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1801 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1802 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1803 | ctx); | |
735bef47 MJ |
1804 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1805 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1806 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1807 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1808 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1809 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1810 | case LTTNG_UST_CONTEXT_NET_NS: | |
1811 | return lttng_add_net_ns_to_ctx(ctx); | |
1812 | case LTTNG_UST_CONTEXT_PID_NS: | |
1813 | return lttng_add_pid_ns_to_ctx(ctx); | |
cefef7a7 MJ |
1814 | case LTTNG_UST_CONTEXT_TIME_NS: |
1815 | return lttng_add_time_ns_to_ctx(ctx); | |
735bef47 MJ |
1816 | case LTTNG_UST_CONTEXT_USER_NS: |
1817 | return lttng_add_user_ns_to_ctx(ctx); | |
1818 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1819 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1820 | case LTTNG_UST_CONTEXT_VUID: |
1821 | return lttng_add_vuid_to_ctx(ctx); | |
1822 | case LTTNG_UST_CONTEXT_VEUID: | |
1823 | return lttng_add_veuid_to_ctx(ctx); | |
1824 | case LTTNG_UST_CONTEXT_VSUID: | |
1825 | return lttng_add_vsuid_to_ctx(ctx); | |
1826 | case LTTNG_UST_CONTEXT_VGID: | |
1827 | return lttng_add_vgid_to_ctx(ctx); | |
1828 | case LTTNG_UST_CONTEXT_VEGID: | |
1829 | return lttng_add_vegid_to_ctx(ctx); | |
1830 | case LTTNG_UST_CONTEXT_VSGID: | |
1831 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1832 | default: |
1833 | return -EINVAL; | |
457a6b58 | 1834 | } |
457a6b58 MD |
1835 | } |
1836 | ||
d871c65b | 1837 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
e58095ef | 1838 | struct lttng_ust_context *context_param) |
457a6b58 | 1839 | { |
e58095ef | 1840 | return -ENOSYS; |
457a6b58 MD |
1841 | } |
1842 | ||
d871c65b | 1843 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1844 | { |
d871c65b FD |
1845 | if (!event_enabler) { |
1846 | return; | |
0f63324a | 1847 | } |
d871c65b | 1848 | cds_list_del(&event_enabler->node); |
0f63324a | 1849 | |
d871c65b | 1850 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef | 1851 | |
d871c65b FD |
1852 | lttng_destroy_context(event_enabler->ctx); |
1853 | free(event_enabler); | |
457a6b58 MD |
1854 | } |
1855 | ||
e58095ef | 1856 | /* |
d871c65b | 1857 | * lttng_session_sync_event_enablers should be called just before starting a |
e58095ef MD |
1858 | * session. |
1859 | */ | |
457a6b58 | 1860 | static |
d871c65b | 1861 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1862 | { |
d871c65b | 1863 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1864 | struct lttng_event *event; |
457a6b58 | 1865 | |
d871c65b FD |
1866 | cds_list_for_each_entry(event_enabler, &session->enablers_head, node) |
1867 | lttng_event_enabler_ref_events(event_enabler); | |
e58095ef MD |
1868 | /* |
1869 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1870 | * and its channel and session transient states are enabled, we |
1871 | * enable the event, else we disable it. | |
e58095ef MD |
1872 | */ |
1873 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1874 | struct lttng_enabler_ref *enabler_ref; | |
1875 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1876 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1877 | |
1878 | /* Enable events */ | |
1879 | cds_list_for_each_entry(enabler_ref, | |
1880 | &event->enablers_ref_head, node) { | |
1881 | if (enabler_ref->ref->enabled) { | |
1882 | enabled = 1; | |
1883 | break; | |
1884 | } | |
1885 | } | |
ac6b4ac6 MD |
1886 | /* |
1887 | * Enabled state is based on union of enablers, with | |
1888 | * intesection of session and channel transient enable | |
1889 | * states. | |
1890 | */ | |
bb84a1ec | 1891 | enabled = enabled && session->tstate && event->container->tstate; |
ac6b4ac6 MD |
1892 | |
1893 | CMM_STORE_SHARED(event->enabled, enabled); | |
1894 | /* | |
1895 | * Sync tracepoint registration with event enabled | |
1896 | * state. | |
1897 | */ | |
1898 | if (enabled) { | |
1899 | if (!event->registered) | |
1900 | register_event(event); | |
1901 | } else { | |
1902 | if (event->registered) | |
1903 | unregister_event(event); | |
1904 | } | |
457a6b58 | 1905 | |
1f49fc05 | 1906 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1907 | cds_list_for_each_entry(enabler_ref, |
1908 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1909 | if (enabler_ref->ref->enabled |
1910 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1911 | has_enablers_without_bytecode = 1; |
1912 | break; | |
1913 | } | |
1914 | } | |
1915 | event->has_enablers_without_bytecode = | |
1916 | has_enablers_without_bytecode; | |
1917 | ||
e58095ef MD |
1918 | /* Enable filters */ |
1919 | cds_list_for_each_entry(runtime, | |
a56fd376 | 1920 | &event->filter_bytecode_runtime_head, node) { |
4d451c15 | 1921 | lttng_bytecode_filter_sync_state(runtime); |
457a6b58 MD |
1922 | } |
1923 | } | |
baa1e0bc | 1924 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1925 | } |
1926 | ||
4296085e MD |
1927 | /* Support for event notifier is introduced by probe provider major version 2. */ |
1928 | static | |
1929 | bool lttng_ust_probe_supports_event_notifier(struct lttng_probe_desc *probe_desc) | |
1930 | { | |
1931 | return probe_desc->major >= 2; | |
1932 | } | |
1933 | ||
d8d2416d FD |
1934 | static |
1935 | void lttng_create_event_notifier_if_missing( | |
1936 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1937 | { | |
1938 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1939 | struct lttng_probe_desc *probe_desc; | |
1940 | struct cds_list_head *probe_list; | |
1941 | int i; | |
1942 | ||
1943 | probe_list = lttng_get_probe_list_head(); | |
1944 | ||
1945 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1946 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1947 | int ret; | |
1948 | bool found = false; | |
1949 | const struct lttng_event_desc *desc; | |
1950 | struct lttng_event_notifier *event_notifier; | |
1951 | struct cds_hlist_head *head; | |
1952 | struct cds_hlist_node *node; | |
1953 | ||
1954 | desc = probe_desc->event_desc[i]; | |
d37ecb3f | 1955 | |
bb84a1ec MD |
1956 | if (lttng_desc_match_enabler(desc, |
1957 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)) <= 0) | |
d8d2416d FD |
1958 | continue; |
1959 | ||
1960 | /* | |
1961 | * Given the current event_notifier group, get the bucket that | |
1962 | * the target event_notifier would be if it was already | |
1963 | * created. | |
1964 | */ | |
1965 | head = borrow_hash_table_bucket( | |
1966 | event_notifier_group->event_notifiers_ht.table, | |
bb84a1ec | 1967 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc->name); |
d8d2416d FD |
1968 | |
1969 | cds_hlist_for_each_entry(event_notifier, node, head, hlist) { | |
1970 | /* | |
1971 | * Check if event_notifier already exists by checking | |
1972 | * if the event_notifier and enabler share the same | |
1973 | * description and id. | |
1974 | */ | |
1975 | if (event_notifier->desc == desc && | |
bb84a1ec | 1976 | event_notifier->user_token == event_notifier_enabler->base.user_token) { |
d8d2416d FD |
1977 | found = true; |
1978 | break; | |
1979 | } | |
1980 | } | |
1981 | ||
1982 | if (found) | |
1983 | continue; | |
1984 | ||
4296085e MD |
1985 | /* Check that the probe supports event notifiers, else report the error. */ |
1986 | if (!lttng_ust_probe_supports_event_notifier(probe_desc)) { | |
1987 | ERR("Probe \"%s\" contains event \"%s\" which matches an enabled event notifier, " | |
1988 | "but its version (%u.%u) is too old and does not implement event notifiers. " | |
1989 | "It needs to be recompiled against a newer version of LTTng-UST, otherwise " | |
1990 | "this event will not generate any notification.", | |
1991 | probe_desc->provider, | |
1992 | desc->name, | |
1993 | probe_desc->major, | |
1994 | probe_desc->minor); | |
1995 | continue; | |
1996 | } | |
d8d2416d FD |
1997 | /* |
1998 | * We need to create a event_notifier for this event probe. | |
1999 | */ | |
2000 | ret = lttng_event_notifier_create(desc, | |
bb84a1ec | 2001 | event_notifier_enabler->base.user_token, |
6566528b | 2002 | event_notifier_enabler->error_counter_index, |
d8d2416d FD |
2003 | event_notifier_group); |
2004 | if (ret) { | |
2005 | DBG("Unable to create event_notifier %s, error %d\n", | |
2006 | probe_desc->event_desc[i]->name, ret); | |
2007 | } | |
2008 | } | |
2009 | } | |
2010 | } | |
2011 | ||
2012 | /* | |
2013 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
2014 | */ | |
2015 | static | |
2016 | int lttng_event_notifier_enabler_ref_event_notifiers( | |
2017 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
2018 | { | |
2019 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
2020 | struct lttng_event_notifier *event_notifier; | |
2021 | ||
2022 | /* | |
2023 | * Only try to create event_notifiers for enablers that are enabled, the user | |
2024 | * might still be attaching filter or exclusion to the | |
2025 | * event_notifier_enabler. | |
2026 | */ | |
2027 | if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled) | |
2028 | goto end; | |
2029 | ||
2030 | /* First, ensure that probe event_notifiers are created for this enabler. */ | |
2031 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
2032 | ||
2033 | /* Link the created event_notifier with its associated enabler. */ | |
2034 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
2035 | struct lttng_enabler_ref *enabler_ref; | |
2036 | ||
2037 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
2038 | continue; | |
2039 | ||
2040 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
2041 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
2042 | if (!enabler_ref) { | |
2043 | /* | |
2044 | * If no backward ref, create it. | |
2045 | * Add backward ref from event_notifier to enabler. | |
2046 | */ | |
2047 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
2048 | if (!enabler_ref) | |
2049 | return -ENOMEM; | |
2050 | ||
2051 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
2052 | event_notifier_enabler); | |
2053 | cds_list_add(&enabler_ref->node, | |
2054 | &event_notifier->enablers_ref_head); | |
2055 | } | |
2056 | ||
2057 | /* | |
2058 | * Link filter bytecodes if not linked yet. | |
2059 | */ | |
2060 | lttng_enabler_link_bytecode(event_notifier->desc, | |
621c07fc FD |
2061 | &event_notifier_group->ctx, |
2062 | &event_notifier->filter_bytecode_runtime_head, | |
2063 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); | |
d37ecb3f FD |
2064 | |
2065 | /* | |
2066 | * Link capture bytecodes if not linked yet. | |
2067 | */ | |
2068 | lttng_enabler_link_bytecode(event_notifier->desc, | |
2069 | &event_notifier_group->ctx, &event_notifier->capture_bytecode_runtime_head, | |
2070 | &event_notifier_enabler->capture_bytecode_head); | |
2071 | ||
2072 | event_notifier->num_captures = event_notifier_enabler->num_captures; | |
d8d2416d FD |
2073 | } |
2074 | end: | |
2075 | return 0; | |
2076 | } | |
2077 | ||
2078 | static | |
2079 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
2080 | { | |
2081 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
2082 | struct lttng_event_notifier *event_notifier; | |
2083 | ||
2084 | cds_list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
2085 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
2086 | ||
2087 | /* | |
2088 | * For each event_notifier, if at least one of its enablers is enabled, | |
2089 | * we enable the event_notifier, else we disable it. | |
2090 | */ | |
2091 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
2092 | struct lttng_enabler_ref *enabler_ref; | |
2093 | struct lttng_bytecode_runtime *runtime; | |
2094 | int enabled = 0, has_enablers_without_bytecode = 0; | |
2095 | ||
2096 | /* Enable event_notifiers */ | |
2097 | cds_list_for_each_entry(enabler_ref, | |
2098 | &event_notifier->enablers_ref_head, node) { | |
2099 | if (enabler_ref->ref->enabled) { | |
2100 | enabled = 1; | |
2101 | break; | |
2102 | } | |
2103 | } | |
2104 | ||
2105 | CMM_STORE_SHARED(event_notifier->enabled, enabled); | |
2106 | /* | |
2107 | * Sync tracepoint registration with event_notifier enabled | |
2108 | * state. | |
2109 | */ | |
2110 | if (enabled) { | |
2111 | if (!event_notifier->registered) | |
2112 | register_event_notifier(event_notifier); | |
2113 | } else { | |
2114 | if (event_notifier->registered) | |
2115 | unregister_event_notifier(event_notifier); | |
2116 | } | |
2117 | ||
2118 | /* Check if has enablers without bytecode enabled */ | |
2119 | cds_list_for_each_entry(enabler_ref, | |
2120 | &event_notifier->enablers_ref_head, node) { | |
2121 | if (enabler_ref->ref->enabled | |
2122 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
2123 | has_enablers_without_bytecode = 1; | |
2124 | break; | |
2125 | } | |
2126 | } | |
2127 | event_notifier->has_enablers_without_bytecode = | |
2128 | has_enablers_without_bytecode; | |
2129 | ||
2130 | /* Enable filters */ | |
2131 | cds_list_for_each_entry(runtime, | |
2132 | &event_notifier->filter_bytecode_runtime_head, node) { | |
4d451c15 | 2133 | lttng_bytecode_filter_sync_state(runtime); |
d8d2416d | 2134 | } |
d37ecb3f FD |
2135 | |
2136 | /* Enable captures. */ | |
2137 | cds_list_for_each_entry(runtime, | |
2138 | &event_notifier->capture_bytecode_runtime_head, node) { | |
2139 | lttng_bytecode_capture_sync_state(runtime); | |
2140 | } | |
d8d2416d FD |
2141 | } |
2142 | __tracepoint_probe_prune_release_queue(); | |
2143 | } | |
2144 | ||
e58095ef MD |
2145 | /* |
2146 | * Apply enablers to session events, adding events to session if need | |
2147 | * be. It is required after each modification applied to an active | |
2148 | * session, and right before session "start". | |
2149 | * "lazy" sync means we only sync if required. | |
2150 | */ | |
2151 | static | |
d871c65b | 2152 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 2153 | { |
e58095ef MD |
2154 | /* We can skip if session is not active */ |
2155 | if (!session->active) | |
2156 | return; | |
d871c65b | 2157 | lttng_session_sync_event_enablers(session); |
457a6b58 | 2158 | } |
53569322 MD |
2159 | |
2160 | /* | |
2161 | * Update all sessions with the given app context. | |
2162 | * Called with ust lock held. | |
2163 | * This is invoked when an application context gets loaded/unloaded. It | |
2164 | * ensures the context callbacks are in sync with the application | |
2165 | * context (either app context callbacks, or dummy callbacks). | |
2166 | */ | |
2167 | void lttng_ust_context_set_session_provider(const char *name, | |
2168 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
2169 | void (*record)(struct lttng_ctx_field *field, | |
2170 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
2171 | struct lttng_channel *chan), | |
2172 | void (*get_value)(struct lttng_ctx_field *field, | |
2173 | struct lttng_ctx_value *value)) | |
2174 | { | |
2175 | struct lttng_session *session; | |
2176 | ||
2177 | cds_list_for_each_entry(session, &sessions, node) { | |
2178 | struct lttng_channel *chan; | |
2179 | struct lttng_event *event; | |
2180 | int ret; | |
2181 | ||
2182 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
2183 | name, get_size, record, get_value); | |
2184 | if (ret) | |
2185 | abort(); | |
2186 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
2187 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
2188 | name, get_size, record, get_value); | |
2189 | if (ret) | |
2190 | abort(); | |
2191 | } | |
2192 | cds_list_for_each_entry(event, &session->events_head, node) { | |
2193 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
2194 | name, get_size, record, get_value); | |
2195 | if (ret) | |
2196 | abort(); | |
2197 | } | |
2198 | } | |
2199 | } | |
d8d2416d FD |
2200 | |
2201 | /* | |
2202 | * Update all event_notifier groups with the given app context. | |
2203 | * Called with ust lock held. | |
2204 | * This is invoked when an application context gets loaded/unloaded. It | |
2205 | * ensures the context callbacks are in sync with the application | |
2206 | * context (either app context callbacks, or dummy callbacks). | |
2207 | */ | |
2208 | void lttng_ust_context_set_event_notifier_group_provider(const char *name, | |
2209 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
2210 | void (*record)(struct lttng_ctx_field *field, | |
2211 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
2212 | struct lttng_channel *chan), | |
2213 | void (*get_value)(struct lttng_ctx_field *field, | |
2214 | struct lttng_ctx_value *value)) | |
2215 | { | |
2216 | struct lttng_event_notifier_group *event_notifier_group; | |
2217 | ||
2218 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2219 | int ret; | |
2220 | ||
2221 | ret = lttng_ust_context_set_provider_rcu( | |
2222 | &event_notifier_group->ctx, | |
2223 | name, get_size, record, get_value); | |
2224 | if (ret) | |
2225 | abort(); | |
2226 | } | |
2227 | } |