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> | |
864a1eda | 36 | #include <ust-helper.h> |
7d3e35b6 | 37 | #include <lttng/ust-ctl.h> |
32ce8569 | 38 | #include <ust-comm.h> |
d8d2416d | 39 | #include <ust-fd.h> |
ae4b659d MJ |
40 | #include <ust-dynamic-type.h> |
41 | #include <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 | |
7753d283 | 68 | struct cds_list_head *lttng_get_sessions(void) |
37dddb65 MD |
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 | ||
6715d7d1 MD |
88 | /* |
89 | * Called with ust lock held. | |
90 | */ | |
91 | int lttng_session_active(void) | |
92 | { | |
93 | struct lttng_session *iter; | |
94 | ||
95 | cds_list_for_each_entry(iter, &sessions, node) { | |
96 | if (iter->active) | |
97 | return 1; | |
98 | } | |
99 | return 0; | |
100 | } | |
101 | ||
e58095ef MD |
102 | static |
103 | int lttng_loglevel_match(int loglevel, | |
104 | unsigned int has_loglevel, | |
457a6b58 MD |
105 | enum lttng_ust_loglevel_type req_type, |
106 | int req_loglevel) | |
107 | { | |
e58095ef MD |
108 | if (!has_loglevel) |
109 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
110 | switch (req_type) { |
111 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 112 | if (loglevel <= req_loglevel |
67ada458 | 113 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
114 | return 1; |
115 | else | |
116 | return 0; | |
117 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 118 | if (loglevel == req_loglevel |
67ada458 | 119 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
120 | return 1; |
121 | else | |
122 | return 0; | |
123 | case LTTNG_UST_LOGLEVEL_ALL: | |
124 | default: | |
67ada458 | 125 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
126 | return 1; |
127 | else | |
128 | return 0; | |
457a6b58 MD |
129 | } |
130 | } | |
131 | ||
7dd08bec | 132 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 133 | { |
7dd08bec | 134 | struct lttng_session *session; |
74d81a6c | 135 | int i; |
8020ceb5 | 136 | |
7dd08bec | 137 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
138 | if (!session) |
139 | return NULL; | |
51f804ec | 140 | if (lttng_context_init_all(&session->ctx)) { |
53569322 MD |
141 | free(session); |
142 | return NULL; | |
143 | } | |
e58095ef MD |
144 | CDS_INIT_LIST_HEAD(&session->chan_head); |
145 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 146 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 147 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
148 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
149 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
150 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
151 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 152 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
153 | return session; |
154 | } | |
155 | ||
ebabbf58 MD |
156 | struct lttng_counter *lttng_ust_counter_create( |
157 | const char *counter_transport_name, | |
158 | size_t number_dimensions, const struct lttng_counter_dimension *dimensions) | |
159 | { | |
160 | struct lttng_counter_transport *counter_transport = NULL; | |
161 | struct lttng_counter *counter = NULL; | |
162 | ||
163 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
164 | if (!counter_transport) | |
165 | goto notransport; | |
166 | counter = zmalloc(sizeof(struct lttng_counter)); | |
167 | if (!counter) | |
168 | goto nomem; | |
169 | ||
170 | counter->ops = &counter_transport->ops; | |
171 | counter->transport = counter_transport; | |
172 | ||
173 | counter->counter = counter->ops->counter_create( | |
174 | number_dimensions, dimensions, 0, | |
175 | -1, 0, NULL, false); | |
176 | if (!counter->counter) { | |
177 | goto create_error; | |
178 | } | |
179 | ||
180 | return counter; | |
181 | ||
182 | create_error: | |
183 | free(counter); | |
184 | nomem: | |
185 | notransport: | |
186 | return NULL; | |
187 | } | |
188 | ||
189 | static | |
190 | void lttng_ust_counter_destroy(struct lttng_counter *counter) | |
191 | { | |
192 | counter->ops->counter_destroy(counter->counter); | |
193 | free(counter); | |
194 | } | |
195 | ||
d8d2416d FD |
196 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
197 | { | |
198 | struct lttng_event_notifier_group *event_notifier_group; | |
199 | int i; | |
200 | ||
201 | event_notifier_group = zmalloc(sizeof(struct lttng_event_notifier_group)); | |
202 | if (!event_notifier_group) | |
203 | return NULL; | |
204 | ||
51f804ec FD |
205 | /* Add all contexts. */ |
206 | if (lttng_context_init_all(&event_notifier_group->ctx)) { | |
207 | free(event_notifier_group); | |
208 | return NULL; | |
209 | } | |
210 | ||
d8d2416d FD |
211 | CDS_INIT_LIST_HEAD(&event_notifier_group->enablers_head); |
212 | CDS_INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
213 | for (i = 0; i < LTTNG_UST_EVENT_NOTIFIER_HT_SIZE; i++) | |
214 | CDS_INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
215 | ||
216 | cds_list_add(&event_notifier_group->node, &event_notifier_groups); | |
217 | ||
218 | return event_notifier_group; | |
219 | } | |
220 | ||
74d81a6c MD |
221 | /* |
222 | * Only used internally at session destruction. | |
223 | */ | |
224 | static | |
225 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
226 | { | |
227 | struct channel *chan; | |
228 | struct lttng_ust_shm_handle *handle; | |
229 | ||
230 | cds_list_del(<tng_chan->node); | |
231 | lttng_destroy_context(lttng_chan->ctx); | |
232 | chan = lttng_chan->chan; | |
233 | handle = lttng_chan->handle; | |
234 | /* | |
235 | * note: lttng_chan is private data contained within handle. It | |
236 | * will be freed along with the handle. | |
237 | */ | |
238 | channel_destroy(chan, handle, 0); | |
239 | } | |
240 | ||
ac6b4ac6 MD |
241 | static |
242 | void register_event(struct lttng_event *event) | |
243 | { | |
244 | int ret; | |
245 | const struct lttng_event_desc *desc; | |
246 | ||
68bb7559 MD |
247 | assert(event->priv->registered == 0); |
248 | desc = event->priv->desc; | |
baa1e0bc | 249 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
250 | desc->probe_callback, |
251 | event, desc->signature); | |
252 | WARN_ON_ONCE(ret); | |
253 | if (!ret) | |
68bb7559 | 254 | event->priv->registered = 1; |
ac6b4ac6 MD |
255 | } |
256 | ||
d8d2416d FD |
257 | static |
258 | void register_event_notifier(struct lttng_event_notifier *event_notifier) | |
259 | { | |
260 | int ret; | |
261 | const struct lttng_event_desc *desc; | |
262 | ||
263 | assert(event_notifier->registered == 0); | |
264 | desc = event_notifier->desc; | |
265 | ret = __tracepoint_probe_register_queue_release(desc->name, | |
266 | desc->u.ext.event_notifier_callback, event_notifier, desc->signature); | |
267 | WARN_ON_ONCE(ret); | |
268 | if (!ret) | |
269 | event_notifier->registered = 1; | |
270 | } | |
271 | ||
ac6b4ac6 MD |
272 | static |
273 | void unregister_event(struct lttng_event *event) | |
274 | { | |
275 | int ret; | |
276 | const struct lttng_event_desc *desc; | |
277 | ||
68bb7559 MD |
278 | assert(event->priv->registered == 1); |
279 | desc = event->priv->desc; | |
baa1e0bc | 280 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
281 | desc->probe_callback, |
282 | event); | |
283 | WARN_ON_ONCE(ret); | |
284 | if (!ret) | |
68bb7559 | 285 | event->priv->registered = 0; |
ac6b4ac6 MD |
286 | } |
287 | ||
d8d2416d FD |
288 | static |
289 | void unregister_event_notifier(struct lttng_event_notifier *event_notifier) | |
290 | { | |
291 | int ret; | |
292 | const struct lttng_event_desc *desc; | |
293 | ||
294 | assert(event_notifier->registered == 1); | |
295 | desc = event_notifier->desc; | |
296 | ret = __tracepoint_probe_unregister_queue_release(desc->name, | |
297 | desc->u.ext.event_notifier_callback, event_notifier); | |
298 | WARN_ON_ONCE(ret); | |
299 | if (!ret) | |
300 | event_notifier->registered = 0; | |
301 | } | |
302 | ||
ac6b4ac6 MD |
303 | /* |
304 | * Only used internally at session destruction. | |
305 | */ | |
306 | static | |
307 | void _lttng_event_unregister(struct lttng_event *event) | |
308 | { | |
68bb7559 | 309 | if (event->priv->registered) |
ac6b4ac6 MD |
310 | unregister_event(event); |
311 | } | |
312 | ||
d8d2416d FD |
313 | /* |
314 | * Only used internally at session destruction. | |
315 | */ | |
316 | static | |
317 | void _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier) | |
318 | { | |
319 | if (event_notifier->registered) | |
320 | unregister_event_notifier(event_notifier); | |
321 | } | |
322 | ||
7dd08bec | 323 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 324 | { |
7dd08bec | 325 | struct lttng_channel *chan, *tmpchan; |
68bb7559 | 326 | struct lttng_ust_event_private *event_priv, *tmpevent_priv; |
c785c634 | 327 | struct lttng_enum *_enum, *tmp_enum; |
d871c65b | 328 | struct lttng_event_enabler *event_enabler, *event_tmpenabler; |
8020ceb5 | 329 | |
b5234c06 | 330 | CMM_ACCESS_ONCE(session->active) = 0; |
68bb7559 MD |
331 | cds_list_for_each_entry(event_priv, &session->events_head, node) { |
332 | _lttng_event_unregister(event_priv->pub); | |
8020ceb5 | 333 | } |
b653ddc1 | 334 | lttng_ust_urcu_synchronize_rcu(); /* Wait for in-flight events to complete */ |
baa1e0bc | 335 | __tracepoint_probe_prune_release_queue(); |
d871c65b | 336 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
e58095ef | 337 | &session->enablers_head, node) |
d871c65b | 338 | lttng_event_enabler_destroy(event_enabler); |
68bb7559 | 339 | cds_list_for_each_entry_safe(event_priv, tmpevent_priv, |
e58095ef | 340 | &session->events_head, node) |
68bb7559 | 341 | _lttng_event_destroy(event_priv->pub); |
c785c634 MD |
342 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
343 | &session->enums_head, node) | |
344 | _lttng_enum_destroy(_enum); | |
e58095ef | 345 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 346 | _lttng_channel_unmap(chan); |
e58095ef | 347 | cds_list_del(&session->node); |
53569322 | 348 | lttng_destroy_context(session->ctx); |
b5234c06 | 349 | free(session); |
8020ceb5 MD |
350 | } |
351 | ||
d8d2416d FD |
352 | void lttng_event_notifier_group_destroy( |
353 | struct lttng_event_notifier_group *event_notifier_group) | |
354 | { | |
355 | int close_ret; | |
356 | struct lttng_event_notifier_enabler *notifier_enabler, *tmpnotifier_enabler; | |
357 | struct lttng_event_notifier *notifier, *tmpnotifier; | |
358 | ||
359 | if (!event_notifier_group) { | |
360 | return; | |
361 | } | |
362 | ||
363 | cds_list_for_each_entry(notifier, | |
364 | &event_notifier_group->event_notifiers_head, node) | |
365 | _lttng_event_notifier_unregister(notifier); | |
366 | ||
b653ddc1 | 367 | lttng_ust_urcu_synchronize_rcu(); |
d8d2416d FD |
368 | |
369 | cds_list_for_each_entry_safe(notifier_enabler, tmpnotifier_enabler, | |
370 | &event_notifier_group->enablers_head, node) | |
371 | lttng_event_notifier_enabler_destroy(notifier_enabler); | |
372 | ||
373 | cds_list_for_each_entry_safe(notifier, tmpnotifier, | |
374 | &event_notifier_group->event_notifiers_head, node) | |
375 | _lttng_event_notifier_destroy(notifier); | |
376 | ||
ebabbf58 MD |
377 | if (event_notifier_group->error_counter) |
378 | lttng_ust_counter_destroy(event_notifier_group->error_counter); | |
379 | ||
380 | /* Close the notification fd to the listener of event_notifiers. */ | |
d8d2416d FD |
381 | |
382 | lttng_ust_lock_fd_tracker(); | |
383 | close_ret = close(event_notifier_group->notification_fd); | |
384 | if (!close_ret) { | |
385 | lttng_ust_delete_fd_from_tracker( | |
386 | event_notifier_group->notification_fd); | |
387 | } else { | |
388 | PERROR("close"); | |
389 | abort(); | |
390 | } | |
391 | lttng_ust_unlock_fd_tracker(); | |
392 | ||
393 | cds_list_del(&event_notifier_group->node); | |
394 | ||
395 | free(event_notifier_group); | |
396 | } | |
397 | ||
d871c65b FD |
398 | static |
399 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
400 | { | |
ab249ecf | 401 | struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node; |
d871c65b FD |
402 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
403 | ||
404 | if (!enabler) { | |
405 | return; | |
406 | } | |
407 | ||
408 | /* Destroy filter bytecode */ | |
409 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
410 | &enabler->filter_bytecode_head, node) { | |
411 | free(filter_node); | |
412 | } | |
413 | ||
414 | /* Destroy excluders */ | |
415 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
416 | &enabler->excluder_head, node) { | |
417 | free(excluder_node); | |
418 | } | |
419 | } | |
420 | ||
d8d2416d FD |
421 | void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler) |
422 | { | |
423 | if (!event_notifier_enabler) { | |
424 | return; | |
425 | } | |
426 | ||
427 | cds_list_del(&event_notifier_enabler->node); | |
428 | ||
429 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
430 | ||
431 | free(event_notifier_enabler); | |
432 | } | |
433 | ||
53569322 MD |
434 | static |
435 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
436 | struct lttng_session *session) | |
437 | { | |
438 | const char *enum_name = desc->name; | |
439 | struct lttng_enum *_enum; | |
440 | struct cds_hlist_head *head; | |
53569322 MD |
441 | int ret = 0; |
442 | size_t name_len = strlen(enum_name); | |
443 | uint32_t hash; | |
444 | int notify_socket; | |
445 | ||
b33b46f7 | 446 | /* Check if this enum is already registered for this session. */ |
53569322 MD |
447 | hash = jhash(enum_name, name_len, 0); |
448 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
b33b46f7 FD |
449 | |
450 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
451 | if (_enum) { | |
452 | ret = -EEXIST; | |
453 | goto exist; | |
53569322 MD |
454 | } |
455 | ||
456 | notify_socket = lttng_get_notify_socket(session->owner); | |
457 | if (notify_socket < 0) { | |
458 | ret = notify_socket; | |
459 | goto socket_error; | |
460 | } | |
461 | ||
462 | _enum = zmalloc(sizeof(*_enum)); | |
463 | if (!_enum) { | |
464 | ret = -ENOMEM; | |
465 | goto cache_error; | |
466 | } | |
467 | _enum->session = session; | |
468 | _enum->desc = desc; | |
469 | ||
470 | ret = ustcomm_register_enum(notify_socket, | |
471 | session->objd, | |
472 | enum_name, | |
473 | desc->nr_entries, | |
474 | desc->entries, | |
475 | &_enum->id); | |
476 | if (ret < 0) { | |
477 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
478 | goto sessiond_register_error; | |
479 | } | |
480 | cds_list_add(&_enum->node, &session->enums_head); | |
481 | cds_hlist_add_head(&_enum->hlist, head); | |
482 | return 0; | |
483 | ||
484 | sessiond_register_error: | |
485 | free(_enum); | |
486 | cache_error: | |
487 | socket_error: | |
488 | exist: | |
489 | return ret; | |
490 | } | |
491 | ||
492 | static | |
493 | int lttng_create_enum_check(const struct lttng_type *type, | |
494 | struct lttng_session *session) | |
495 | { | |
496 | switch (type->atype) { | |
497 | case atype_enum: | |
498 | { | |
499 | const struct lttng_enum_desc *enum_desc; | |
500 | int ret; | |
501 | ||
218deb69 MD |
502 | enum_desc = type->u.legacy.basic.enumeration.desc; |
503 | ret = lttng_enum_create(enum_desc, session); | |
504 | if (ret && ret != -EEXIST) { | |
505 | DBG("Unable to create enum error: (%d)", ret); | |
506 | return ret; | |
507 | } | |
508 | break; | |
509 | } | |
510 | case atype_enum_nestable: | |
511 | { | |
512 | const struct lttng_enum_desc *enum_desc; | |
513 | int ret; | |
514 | ||
515 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
516 | ret = lttng_enum_create(enum_desc, session); |
517 | if (ret && ret != -EEXIST) { | |
518 | DBG("Unable to create enum error: (%d)", ret); | |
519 | return ret; | |
520 | } | |
521 | break; | |
522 | } | |
523 | case atype_dynamic: | |
524 | { | |
525 | const struct lttng_event_field *tag_field_generic; | |
526 | const struct lttng_enum_desc *enum_desc; | |
527 | int ret; | |
528 | ||
529 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 530 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
531 | ret = lttng_enum_create(enum_desc, session); |
532 | if (ret && ret != -EEXIST) { | |
533 | DBG("Unable to create enum error: (%d)", ret); | |
534 | return ret; | |
535 | } | |
536 | break; | |
537 | } | |
538 | default: | |
539 | /* TODO: nested types when they become supported. */ | |
540 | break; | |
541 | } | |
542 | return 0; | |
543 | } | |
544 | ||
545 | static | |
546 | int lttng_create_all_event_enums(size_t nr_fields, | |
547 | const struct lttng_event_field *event_fields, | |
548 | struct lttng_session *session) | |
549 | { | |
550 | size_t i; | |
551 | int ret; | |
552 | ||
553 | /* For each field, ensure enum is part of the session. */ | |
554 | for (i = 0; i < nr_fields; i++) { | |
555 | const struct lttng_type *type = &event_fields[i].type; | |
556 | ||
557 | ret = lttng_create_enum_check(type, session); | |
558 | if (ret) | |
559 | return ret; | |
560 | } | |
561 | return 0; | |
562 | } | |
563 | ||
564 | static | |
565 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
566 | const struct lttng_ctx_field *ctx_fields, | |
567 | struct lttng_session *session) | |
568 | { | |
569 | size_t i; | |
570 | int ret; | |
571 | ||
572 | /* For each field, ensure enum is part of the session. */ | |
573 | for (i = 0; i < nr_fields; i++) { | |
574 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
575 | ||
576 | ret = lttng_create_enum_check(type, session); | |
577 | if (ret) | |
578 | return ret; | |
579 | } | |
580 | return 0; | |
581 | } | |
582 | ||
710b8ee3 MD |
583 | /* |
584 | * Ensure that a state-dump will be performed for this session at the end | |
585 | * of the current handle_message(). | |
586 | */ | |
587 | int lttng_session_statedump(struct lttng_session *session) | |
588 | { | |
589 | session->statedump_pending = 1; | |
590 | lttng_ust_sockinfo_session_enabled(session->owner); | |
591 | return 0; | |
592 | } | |
53569322 | 593 | |
7dd08bec | 594 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
595 | { |
596 | int ret = 0; | |
7dd08bec | 597 | struct lttng_channel *chan; |
32ce8569 | 598 | int notify_socket; |
8020ceb5 | 599 | |
8020ceb5 MD |
600 | if (session->active) { |
601 | ret = -EBUSY; | |
602 | goto end; | |
603 | } | |
604 | ||
32ce8569 MD |
605 | notify_socket = lttng_get_notify_socket(session->owner); |
606 | if (notify_socket < 0) | |
607 | return notify_socket; | |
608 | ||
ac6b4ac6 MD |
609 | /* Set transient enabler state to "enabled" */ |
610 | session->tstate = 1; | |
e58095ef | 611 | |
3ff7660f | 612 | /* We need to sync enablers with session before activation. */ |
d871c65b | 613 | lttng_session_sync_event_enablers(session); |
3ff7660f | 614 | |
8020ceb5 MD |
615 | /* |
616 | * Snapshot the number of events per channel to know the type of header | |
617 | * we need to use. | |
618 | */ | |
e58095ef | 619 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 620 | const struct lttng_ctx *ctx; |
83e43212 | 621 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 622 | size_t nr_fields = 0; |
6ca18e66 | 623 | uint32_t chan_id; |
32ce8569 MD |
624 | |
625 | /* don't change it if session stop/restart */ | |
8020ceb5 | 626 | if (chan->header_type) |
32ce8569 MD |
627 | continue; |
628 | ctx = chan->ctx; | |
629 | if (ctx) { | |
630 | nr_fields = ctx->nr_fields; | |
83e43212 | 631 | fields = ctx->fields; |
53569322 MD |
632 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
633 | session); | |
634 | if (ret < 0) { | |
635 | DBG("Error (%d) adding enum to session", ret); | |
636 | return ret; | |
637 | } | |
32ce8569 MD |
638 | } |
639 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 640 | session, |
32ce8569 MD |
641 | session->objd, |
642 | chan->objd, | |
643 | nr_fields, | |
644 | fields, | |
6ca18e66 | 645 | &chan_id, |
32ce8569 | 646 | &chan->header_type); |
b869b5ae MD |
647 | if (ret) { |
648 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 649 | return ret; |
b869b5ae | 650 | } |
6ca18e66 MD |
651 | if (chan_id != chan->id) { |
652 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
653 | chan_id, chan->id); | |
654 | return -EINVAL; | |
655 | } | |
8020ceb5 MD |
656 | } |
657 | ||
ac6b4ac6 | 658 | /* Set atomically the state to "active" */ |
b5234c06 MD |
659 | CMM_ACCESS_ONCE(session->active) = 1; |
660 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 661 | |
710b8ee3 MD |
662 | ret = lttng_session_statedump(session); |
663 | if (ret) | |
664 | return ret; | |
8020ceb5 | 665 | end: |
8020ceb5 MD |
666 | return ret; |
667 | } | |
668 | ||
7dd08bec | 669 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
670 | { |
671 | int ret = 0; | |
672 | ||
8020ceb5 MD |
673 | if (!session->active) { |
674 | ret = -EBUSY; | |
675 | goto end; | |
676 | } | |
ac6b4ac6 | 677 | /* Set atomically the state to "inactive" */ |
b5234c06 | 678 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
679 | |
680 | /* Set transient enabler state to "disabled" */ | |
681 | session->tstate = 0; | |
d871c65b | 682 | lttng_session_sync_event_enablers(session); |
8020ceb5 | 683 | end: |
8020ceb5 MD |
684 | return ret; |
685 | } | |
686 | ||
7dd08bec | 687 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 688 | { |
ac6b4ac6 | 689 | int ret = 0; |
976fe9ea | 690 | |
ac6b4ac6 MD |
691 | if (channel->enabled) { |
692 | ret = -EBUSY; | |
693 | goto end; | |
694 | } | |
695 | /* Set transient enabler state to "enabled" */ | |
696 | channel->tstate = 1; | |
d871c65b | 697 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
698 | /* Set atomically the state to "enabled" */ |
699 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
700 | end: | |
701 | return ret; | |
976fe9ea MD |
702 | } |
703 | ||
7dd08bec | 704 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 705 | { |
ac6b4ac6 | 706 | int ret = 0; |
976fe9ea | 707 | |
ac6b4ac6 MD |
708 | if (!channel->enabled) { |
709 | ret = -EBUSY; | |
710 | goto end; | |
711 | } | |
712 | /* Set atomically the state to "disabled" */ | |
713 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
714 | /* Set transient enabler state to "enabled" */ | |
715 | channel->tstate = 0; | |
d871c65b | 716 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
717 | end: |
718 | return ret; | |
976fe9ea MD |
719 | } |
720 | ||
fb470188 FD |
721 | static inline |
722 | struct cds_hlist_head *borrow_hash_table_bucket( | |
723 | struct cds_hlist_head *hash_table, | |
724 | unsigned int hash_table_size, | |
725 | const struct lttng_event_desc *desc) | |
726 | { | |
727 | const char *event_name; | |
728 | size_t name_len; | |
729 | uint32_t hash; | |
730 | ||
731 | event_name = desc->name; | |
732 | name_len = strlen(event_name); | |
733 | ||
734 | hash = jhash(event_name, name_len, 0); | |
735 | return &hash_table[hash & (hash_table_size - 1)]; | |
736 | } | |
737 | ||
8020ceb5 MD |
738 | /* |
739 | * Supports event creation while tracing session is active. | |
740 | */ | |
e58095ef MD |
741 | static |
742 | int lttng_event_create(const struct lttng_event_desc *desc, | |
743 | struct lttng_channel *chan) | |
8020ceb5 | 744 | { |
7dd08bec | 745 | struct lttng_event *event; |
68bb7559 | 746 | struct lttng_ust_event_private *event_priv; |
32ce8569 | 747 | struct lttng_session *session = chan->session; |
d56fa719 | 748 | struct cds_hlist_head *head; |
576599a0 | 749 | int ret = 0; |
32ce8569 MD |
750 | int notify_socket, loglevel; |
751 | const char *uri; | |
8020ceb5 | 752 | |
fb470188 FD |
753 | head = borrow_hash_table_bucket(chan->session->events_ht.table, |
754 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
457a6b58 | 755 | |
32ce8569 MD |
756 | notify_socket = lttng_get_notify_socket(session->owner); |
757 | if (notify_socket < 0) { | |
758 | ret = notify_socket; | |
759 | goto socket_error; | |
760 | } | |
761 | ||
53569322 MD |
762 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
763 | session); | |
c785c634 MD |
764 | if (ret < 0) { |
765 | DBG("Error (%d) adding enum to session", ret); | |
766 | goto create_enum_error; | |
767 | } | |
768 | ||
457a6b58 MD |
769 | /* |
770 | * Check if loglevel match. Refuse to connect event if not. | |
771 | */ | |
7dd08bec | 772 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
773 | if (!event) { |
774 | ret = -ENOMEM; | |
8020ceb5 | 775 | goto cache_error; |
576599a0 | 776 | } |
68bb7559 MD |
777 | event_priv = zmalloc(sizeof(struct lttng_ust_event_private)); |
778 | if (!event_priv) { | |
779 | ret = -ENOMEM; | |
780 | goto priv_error; | |
781 | } | |
782 | event->priv = event_priv; | |
783 | event_priv->pub = event; | |
8020ceb5 | 784 | event->chan = chan; |
e58095ef | 785 | |
ac6b4ac6 MD |
786 | /* Event will be enabled by enabler sync. */ |
787 | event->enabled = 0; | |
68bb7559 | 788 | event->priv->registered = 0; |
a56fd376 | 789 | CDS_INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
68bb7559 MD |
790 | CDS_INIT_LIST_HEAD(&event->priv->enablers_ref_head); |
791 | event->priv->desc = desc; | |
32ce8569 MD |
792 | |
793 | if (desc->loglevel) | |
68bb7559 | 794 | loglevel = *(*event->priv->desc->loglevel); |
32ce8569 MD |
795 | else |
796 | loglevel = TRACE_DEFAULT; | |
797 | if (desc->u.ext.model_emf_uri) | |
798 | uri = *(desc->u.ext.model_emf_uri); | |
799 | else | |
800 | uri = NULL; | |
801 | ||
13b21cd6 MD |
802 | /* Fetch event ID from sessiond */ |
803 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 804 | session, |
13b21cd6 MD |
805 | session->objd, |
806 | chan->objd, | |
fb470188 | 807 | desc->name, |
13b21cd6 MD |
808 | loglevel, |
809 | desc->signature, | |
810 | desc->nr_fields, | |
811 | desc->fields, | |
812 | uri, | |
813 | &event->id); | |
814 | if (ret < 0) { | |
815 | DBG("Error (%d) registering event to sessiond", ret); | |
816 | goto sessiond_register_error; | |
32ce8569 | 817 | } |
2b213b16 | 818 | |
68bb7559 MD |
819 | cds_list_add(&event->priv->node, &chan->session->events_head); |
820 | cds_hlist_add_head(&event->priv->hlist, head); | |
576599a0 | 821 | return 0; |
8020ceb5 | 822 | |
32ce8569 | 823 | sessiond_register_error: |
68bb7559 MD |
824 | free(event_priv); |
825 | priv_error: | |
b5234c06 | 826 | free(event); |
8020ceb5 | 827 | cache_error: |
c785c634 | 828 | create_enum_error: |
32ce8569 | 829 | socket_error: |
576599a0 | 830 | return ret; |
8020ceb5 MD |
831 | } |
832 | ||
d8d2416d FD |
833 | static |
834 | int lttng_event_notifier_create(const struct lttng_event_desc *desc, | |
6566528b | 835 | uint64_t token, uint64_t error_counter_index, |
d8d2416d FD |
836 | struct lttng_event_notifier_group *event_notifier_group) |
837 | { | |
838 | struct lttng_event_notifier *event_notifier; | |
839 | struct cds_hlist_head *head; | |
840 | int ret = 0; | |
841 | ||
842 | /* | |
843 | * Get the hashtable bucket the created lttng_event_notifier object | |
844 | * should be inserted. | |
845 | */ | |
846 | head = borrow_hash_table_bucket( | |
847 | event_notifier_group->event_notifiers_ht.table, | |
848 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
849 | ||
850 | event_notifier = zmalloc(sizeof(struct lttng_event_notifier)); | |
851 | if (!event_notifier) { | |
852 | ret = -ENOMEM; | |
853 | goto error; | |
854 | } | |
855 | ||
856 | event_notifier->group = event_notifier_group; | |
857 | event_notifier->user_token = token; | |
6566528b | 858 | event_notifier->error_counter_index = error_counter_index; |
d8d2416d FD |
859 | |
860 | /* Event notifier will be enabled by enabler sync. */ | |
861 | event_notifier->enabled = 0; | |
862 | event_notifier->registered = 0; | |
863 | ||
864 | CDS_INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); | |
d37ecb3f | 865 | CDS_INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head); |
d8d2416d FD |
866 | CDS_INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
867 | event_notifier->desc = desc; | |
cab88ff8 | 868 | event_notifier->notification_send = lttng_event_notifier_notification_send; |
d8d2416d FD |
869 | |
870 | cds_list_add(&event_notifier->node, | |
871 | &event_notifier_group->event_notifiers_head); | |
872 | cds_hlist_add_head(&event_notifier->hlist, head); | |
873 | ||
874 | return 0; | |
875 | ||
876 | error: | |
877 | return ret; | |
878 | } | |
879 | ||
880 | static | |
881 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
882 | { | |
883 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
884 | ||
885 | /* Remove from event_notifier list. */ | |
886 | cds_list_del(&event_notifier->node); | |
887 | /* Remove from event_notifier hash table. */ | |
888 | cds_hlist_del(&event_notifier->hlist); | |
889 | ||
890 | lttng_free_event_notifier_filter_runtime(event_notifier); | |
891 | ||
892 | /* Free event_notifier enabler refs */ | |
893 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
894 | &event_notifier->enablers_ref_head, node) | |
895 | free(enabler_ref); | |
896 | free(event_notifier); | |
897 | } | |
898 | ||
e58095ef | 899 | static |
196ec2df | 900 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
901 | struct lttng_enabler *enabler) |
902 | { | |
903 | int loglevel = 0; | |
7e2e405c | 904 | unsigned int has_loglevel = 0; |
e58095ef | 905 | |
e450e339 | 906 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f6f42e6 MD |
907 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
908 | desc->name, SIZE_MAX)) | |
e58095ef MD |
909 | return 0; |
910 | if (desc->loglevel) { | |
911 | loglevel = *(*desc->loglevel); | |
912 | has_loglevel = 1; | |
913 | } | |
914 | if (!lttng_loglevel_match(loglevel, | |
915 | has_loglevel, | |
916 | enabler->event_param.loglevel_type, | |
917 | enabler->event_param.loglevel)) | |
918 | return 0; | |
919 | return 1; | |
920 | } | |
921 | ||
922 | static | |
923 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
924 | struct lttng_enabler *enabler) | |
925 | { | |
926 | int loglevel = 0; | |
927 | unsigned int has_loglevel = 0; | |
928 | ||
e450e339 | 929 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
e58095ef MD |
930 | if (strcmp(desc->name, enabler->event_param.name)) |
931 | return 0; | |
932 | if (desc->loglevel) { | |
933 | loglevel = *(*desc->loglevel); | |
934 | has_loglevel = 1; | |
935 | } | |
936 | if (!lttng_loglevel_match(loglevel, | |
937 | has_loglevel, | |
938 | enabler->event_param.loglevel_type, | |
939 | enabler->event_param.loglevel)) | |
940 | return 0; | |
941 | return 1; | |
942 | } | |
943 | ||
944 | static | |
945 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
946 | struct lttng_enabler *enabler) | |
947 | { | |
e450e339 FD |
948 | switch (enabler->format_type) { |
949 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
196ec2df PP |
950 | { |
951 | struct lttng_ust_excluder_node *excluder; | |
952 | ||
953 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
954 | return 0; | |
955 | } | |
956 | ||
957 | /* | |
958 | * If the matching event matches with an excluder, | |
959 | * return 'does not match' | |
960 | */ | |
961 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
962 | int count; | |
963 | ||
964 | for (count = 0; count < excluder->excluder.count; count++) { | |
965 | int len; | |
966 | char *excluder_name; | |
967 | ||
968 | excluder_name = (char *) (excluder->excluder.names) | |
969 | + count * LTTNG_UST_SYM_NAME_LEN; | |
970 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 971 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 972 | return 0; |
ed5b5bbd JI |
973 | } |
974 | } | |
196ec2df | 975 | return 1; |
ed5b5bbd | 976 | } |
e450e339 | 977 | case LTTNG_ENABLER_FORMAT_EVENT: |
e58095ef MD |
978 | return lttng_desc_match_event_enabler(desc, enabler); |
979 | default: | |
980 | return -EINVAL; | |
981 | } | |
982 | } | |
983 | ||
984 | static | |
d871c65b FD |
985 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
986 | struct lttng_event *event) | |
e58095ef | 987 | { |
68bb7559 | 988 | if (lttng_desc_match_enabler(event->priv->desc, |
d871c65b FD |
989 | lttng_event_enabler_as_enabler(event_enabler)) |
990 | && event->chan == event_enabler->chan) | |
d970f72e MD |
991 | return 1; |
992 | else | |
993 | return 0; | |
e58095ef MD |
994 | } |
995 | ||
d8d2416d FD |
996 | static |
997 | int lttng_event_notifier_enabler_match_event_notifier( | |
998 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
999 | struct lttng_event_notifier *event_notifier) | |
1000 | { | |
1001 | int desc_matches = lttng_desc_match_enabler(event_notifier->desc, | |
1002 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1003 | ||
1004 | if (desc_matches && event_notifier->group == event_notifier_enabler->group && | |
1005 | event_notifier->user_token == event_notifier_enabler->user_token) | |
1006 | return 1; | |
1007 | else | |
1008 | return 0; | |
1009 | } | |
1010 | ||
e58095ef | 1011 | static |
d871c65b FD |
1012 | struct lttng_enabler_ref *lttng_enabler_ref( |
1013 | struct cds_list_head *enabler_ref_list, | |
e58095ef MD |
1014 | struct lttng_enabler *enabler) |
1015 | { | |
1016 | struct lttng_enabler_ref *enabler_ref; | |
1017 | ||
d871c65b | 1018 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
e58095ef MD |
1019 | if (enabler_ref->ref == enabler) |
1020 | return enabler_ref; | |
1021 | } | |
1022 | return NULL; | |
1023 | } | |
1024 | ||
8020ceb5 | 1025 | /* |
e58095ef MD |
1026 | * Create struct lttng_event if it is missing and present in the list of |
1027 | * tracepoint probes. | |
8020ceb5 | 1028 | */ |
e58095ef | 1029 | static |
d871c65b | 1030 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1031 | { |
d871c65b | 1032 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1033 | struct lttng_probe_desc *probe_desc; |
1034 | const struct lttng_event_desc *desc; | |
68bb7559 | 1035 | struct lttng_ust_event_private *event_priv; |
e58095ef MD |
1036 | int i; |
1037 | struct cds_list_head *probe_list; | |
1038 | ||
1039 | probe_list = lttng_get_probe_list_head(); | |
1040 | /* | |
1041 | * For each probe event, if we find that a probe event matches | |
1042 | * our enabler, create an associated lttng_event if not | |
1043 | * already present. | |
1044 | */ | |
1045 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1046 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
1047 | int ret; |
1048 | bool found = false; | |
d56fa719 MD |
1049 | struct cds_hlist_head *head; |
1050 | struct cds_hlist_node *node; | |
e58095ef MD |
1051 | |
1052 | desc = probe_desc->event_desc[i]; | |
d871c65b FD |
1053 | if (!lttng_desc_match_enabler(desc, |
1054 | lttng_event_enabler_as_enabler(event_enabler))) | |
e58095ef MD |
1055 | continue; |
1056 | ||
fb470188 FD |
1057 | head = borrow_hash_table_bucket( |
1058 | session->events_ht.table, | |
1059 | LTTNG_UST_EVENT_HT_SIZE, desc); | |
1060 | ||
68bb7559 MD |
1061 | cds_hlist_for_each_entry(event_priv, node, head, hlist) { |
1062 | if (event_priv->desc == desc | |
1063 | && event_priv->pub->chan == event_enabler->chan) { | |
98a97f24 | 1064 | found = true; |
3140bffe FD |
1065 | break; |
1066 | } | |
e58095ef MD |
1067 | } |
1068 | if (found) | |
1069 | continue; | |
1070 | ||
1071 | /* | |
1072 | * We need to create an event for this | |
1073 | * event probe. | |
1074 | */ | |
1075 | ret = lttng_event_create(probe_desc->event_desc[i], | |
d871c65b | 1076 | event_enabler->chan); |
e58095ef | 1077 | if (ret) { |
32ce8569 MD |
1078 | DBG("Unable to create event %s, error %d\n", |
1079 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 1080 | } |
8165c8da | 1081 | } |
8020ceb5 | 1082 | } |
8020ceb5 MD |
1083 | } |
1084 | ||
a44d07da FD |
1085 | static |
1086 | void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc, | |
d8d2416d FD |
1087 | void (*event_func)(struct lttng_session *session, |
1088 | struct lttng_event *event), | |
1089 | void (*event_notifier_func)(struct lttng_event_notifier *event_notifier)) | |
35ac38cb FD |
1090 | { |
1091 | struct cds_hlist_node *node, *tmp_node; | |
1092 | struct cds_list_head *sessionsp; | |
a44d07da | 1093 | unsigned int i; |
35ac38cb FD |
1094 | |
1095 | /* Get handle on list of sessions. */ | |
7753d283 | 1096 | sessionsp = lttng_get_sessions(); |
35ac38cb FD |
1097 | |
1098 | /* | |
a44d07da FD |
1099 | * Iterate over all events in the probe provider descriptions and |
1100 | * sessions to queue the unregistration of the events. | |
35ac38cb FD |
1101 | */ |
1102 | for (i = 0; i < provider_desc->nr_events; i++) { | |
1103 | const struct lttng_event_desc *event_desc; | |
d8d2416d FD |
1104 | struct lttng_event_notifier_group *event_notifier_group; |
1105 | struct lttng_event_notifier *event_notifier; | |
a44d07da FD |
1106 | struct lttng_session *session; |
1107 | struct cds_hlist_head *head; | |
68bb7559 | 1108 | struct lttng_ust_event_private *event_priv; |
35ac38cb FD |
1109 | |
1110 | event_desc = provider_desc->event_desc[i]; | |
35ac38cb | 1111 | |
a44d07da FD |
1112 | /* |
1113 | * Iterate over all session to find the current event | |
1114 | * description. | |
1115 | */ | |
35ac38cb FD |
1116 | cds_list_for_each_entry(session, sessionsp, node) { |
1117 | /* | |
a44d07da FD |
1118 | * Get the list of events in the hashtable bucket and |
1119 | * iterate to find the event matching this descriptor. | |
35ac38cb | 1120 | */ |
fb470188 FD |
1121 | head = borrow_hash_table_bucket( |
1122 | session->events_ht.table, | |
1123 | LTTNG_UST_EVENT_HT_SIZE, event_desc); | |
1124 | ||
68bb7559 MD |
1125 | cds_hlist_for_each_entry_safe(event_priv, node, tmp_node, head, hlist) { |
1126 | if (event_desc == event_priv->desc) { | |
1127 | event_func(session, event_priv->pub); | |
35ac38cb FD |
1128 | break; |
1129 | } | |
1130 | } | |
1131 | } | |
d8d2416d FD |
1132 | |
1133 | /* | |
1134 | * Iterate over all event_notifier groups to find the current event | |
1135 | * description. | |
1136 | */ | |
1137 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1138 | /* | |
1139 | * Get the list of event_notifiers in the hashtable bucket and | |
1140 | * iterate to find the event_notifier matching this | |
1141 | * descriptor. | |
1142 | */ | |
1143 | head = borrow_hash_table_bucket( | |
1144 | event_notifier_group->event_notifiers_ht.table, | |
1145 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, event_desc); | |
1146 | ||
1147 | cds_hlist_for_each_entry_safe(event_notifier, node, tmp_node, head, hlist) { | |
1148 | if (event_desc == event_notifier->desc) { | |
1149 | event_notifier_func(event_notifier); | |
1150 | break; | |
1151 | } | |
1152 | } | |
1153 | } | |
35ac38cb | 1154 | } |
a44d07da FD |
1155 | } |
1156 | ||
1157 | static | |
1158 | void _unregister_event(struct lttng_session *session, | |
1159 | struct lttng_event *event) | |
1160 | { | |
1161 | _lttng_event_unregister(event); | |
1162 | } | |
1163 | ||
1164 | static | |
1165 | void _event_enum_destroy(struct lttng_session *session, | |
1166 | struct lttng_event *event) | |
1167 | { | |
1168 | unsigned int i; | |
1169 | ||
1170 | /* Destroy enums of the current event. */ | |
68bb7559 | 1171 | for (i = 0; i < event->priv->desc->nr_fields; i++) { |
a44d07da FD |
1172 | const struct lttng_enum_desc *enum_desc; |
1173 | const struct lttng_event_field *field; | |
1174 | struct lttng_enum *curr_enum; | |
1175 | ||
68bb7559 | 1176 | field = &(event->priv->desc->fields[i]); |
a44d07da FD |
1177 | switch (field->type.atype) { |
1178 | case atype_enum: | |
1179 | enum_desc = field->type.u.legacy.basic.enumeration.desc; | |
1180 | break; | |
1181 | case atype_enum_nestable: | |
1182 | enum_desc = field->type.u.enum_nestable.desc; | |
1183 | break; | |
1184 | default: | |
1185 | continue; | |
1186 | } | |
1187 | ||
1188 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); | |
1189 | if (curr_enum) { | |
1190 | _lttng_enum_destroy(curr_enum); | |
1191 | } | |
1192 | } | |
1193 | ||
1194 | /* Destroy event. */ | |
1195 | _lttng_event_destroy(event); | |
1196 | } | |
1197 | ||
1198 | /* | |
1199 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
1200 | * the probe provider descriptor received as argument. Must me called with the | |
1201 | * ust_lock held. | |
1202 | */ | |
1203 | void lttng_probe_provider_unregister_events( | |
1204 | struct lttng_probe_desc *provider_desc) | |
1205 | { | |
1206 | /* | |
1207 | * Iterate over all events in the probe provider descriptions and sessions | |
1208 | * to queue the unregistration of the events. | |
1209 | */ | |
d8d2416d FD |
1210 | probe_provider_event_for_each(provider_desc, _unregister_event, |
1211 | _lttng_event_notifier_unregister); | |
35ac38cb FD |
1212 | |
1213 | /* Wait for grace period. */ | |
b653ddc1 | 1214 | lttng_ust_urcu_synchronize_rcu(); |
35ac38cb FD |
1215 | /* Prune the unregistration queue. */ |
1216 | __tracepoint_probe_prune_release_queue(); | |
1217 | ||
1218 | /* | |
1219 | * It is now safe to destroy the events and remove them from the event list | |
1220 | * and hashtables. | |
1221 | */ | |
d8d2416d FD |
1222 | probe_provider_event_for_each(provider_desc, _event_enum_destroy, |
1223 | _lttng_event_notifier_destroy); | |
35ac38cb FD |
1224 | } |
1225 | ||
8020ceb5 | 1226 | /* |
d8d2416d | 1227 | * Create events associated with an event enabler (if not already present), |
e58095ef | 1228 | * and add backward reference from the event to the enabler. |
8020ceb5 MD |
1229 | */ |
1230 | static | |
d871c65b | 1231 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1232 | { |
d871c65b | 1233 | struct lttng_session *session = event_enabler->chan->session; |
68bb7559 | 1234 | struct lttng_ust_event_private *event_priv; |
e58095ef | 1235 | |
d871c65b | 1236 | if (!lttng_event_enabler_as_enabler(event_enabler)->enabled) |
de713d8a FD |
1237 | goto end; |
1238 | ||
e58095ef | 1239 | /* First ensure that probe events are created for this enabler. */ |
d871c65b | 1240 | lttng_create_event_if_missing(event_enabler); |
e58095ef MD |
1241 | |
1242 | /* For each event matching enabler in session event list. */ | |
68bb7559 | 1243 | cds_list_for_each_entry(event_priv, &session->events_head, node) { |
e58095ef MD |
1244 | struct lttng_enabler_ref *enabler_ref; |
1245 | ||
68bb7559 | 1246 | if (!lttng_event_enabler_match_event(event_enabler, event_priv->pub)) |
e58095ef MD |
1247 | continue; |
1248 | ||
68bb7559 | 1249 | enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, |
d871c65b | 1250 | lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef MD |
1251 | if (!enabler_ref) { |
1252 | /* | |
1253 | * If no backward ref, create it. | |
1254 | * Add backward ref from event to enabler. | |
1255 | */ | |
1256 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1257 | if (!enabler_ref) | |
1258 | return -ENOMEM; | |
d871c65b FD |
1259 | enabler_ref->ref = lttng_event_enabler_as_enabler( |
1260 | event_enabler); | |
e58095ef | 1261 | cds_list_add(&enabler_ref->node, |
68bb7559 | 1262 | &event_priv->enablers_ref_head); |
8165c8da | 1263 | } |
e58095ef MD |
1264 | |
1265 | /* | |
1266 | * Link filter bytecodes if not linked yet. | |
1267 | */ | |
68bb7559 | 1268 | lttng_enabler_link_bytecode(event_priv->desc, |
53b9d7db | 1269 | &session->ctx, |
68bb7559 | 1270 | &event_priv->pub->filter_bytecode_runtime_head, |
621c07fc | 1271 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
e58095ef MD |
1272 | |
1273 | /* TODO: merge event context. */ | |
1274 | } | |
de713d8a | 1275 | end: |
e58095ef MD |
1276 | return 0; |
1277 | } | |
1278 | ||
1279 | /* | |
1280 | * Called at library load: connect the probe on all enablers matching | |
1281 | * this event. | |
5f733922 | 1282 | * Called with session mutex held. |
e58095ef | 1283 | */ |
5f733922 | 1284 | int lttng_fix_pending_events(void) |
e58095ef MD |
1285 | { |
1286 | struct lttng_session *session; | |
1287 | ||
1288 | cds_list_for_each_entry(session, &sessions, node) { | |
d871c65b | 1289 | lttng_session_lazy_sync_event_enablers(session); |
8020ceb5 | 1290 | } |
e58095ef MD |
1291 | return 0; |
1292 | } | |
1293 | ||
d8d2416d FD |
1294 | int lttng_fix_pending_event_notifiers(void) |
1295 | { | |
1296 | struct lttng_event_notifier_group *event_notifier_group; | |
1297 | ||
1298 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1299 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1300 | } | |
1301 | return 0; | |
1302 | } | |
1303 | ||
246be17e | 1304 | /* |
37dddb65 MD |
1305 | * For each session of the owner thread, execute pending statedump. |
1306 | * Only dump state for the sessions owned by the caller thread, because | |
1307 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 1308 | */ |
3327ac33 | 1309 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
1310 | { |
1311 | struct lttng_session *session; | |
1312 | ||
37dddb65 | 1313 | /* Execute state dump */ |
cf73e0fe | 1314 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
1315 | |
1316 | /* Clear pending state dump */ | |
3327ac33 MD |
1317 | if (ust_lock()) { |
1318 | goto end; | |
1319 | } | |
246be17e | 1320 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
1321 | if (session->owner != owner) |
1322 | continue; | |
1323 | if (!session->statedump_pending) | |
1324 | continue; | |
1325 | session->statedump_pending = 0; | |
246be17e | 1326 | } |
3327ac33 | 1327 | end: |
37dddb65 | 1328 | ust_unlock(); |
3327ac33 | 1329 | return; |
246be17e PW |
1330 | } |
1331 | ||
e58095ef MD |
1332 | /* |
1333 | * Only used internally at session destruction. | |
1334 | */ | |
1335 | static | |
1336 | void _lttng_event_destroy(struct lttng_event *event) | |
1337 | { | |
1338 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1339 | ||
35ac38cb | 1340 | /* Remove from event list. */ |
68bb7559 | 1341 | cds_list_del(&event->priv->node); |
35ac38cb | 1342 | /* Remove from event hash table. */ |
68bb7559 | 1343 | cds_hlist_del(&event->priv->hlist); |
35ac38cb | 1344 | |
8020ceb5 | 1345 | lttng_destroy_context(event->ctx); |
f488575f | 1346 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1347 | /* Free event enabler refs */ |
1348 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
68bb7559 | 1349 | &event->priv->enablers_ref_head, node) |
e58095ef | 1350 | free(enabler_ref); |
68bb7559 | 1351 | free(event->priv); |
b5234c06 | 1352 | free(event); |
8020ceb5 MD |
1353 | } |
1354 | ||
c785c634 MD |
1355 | static |
1356 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1357 | { | |
1358 | cds_list_del(&_enum->node); | |
35ac38cb | 1359 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1360 | free(_enum); |
1361 | } | |
1362 | ||
003fedf4 | 1363 | void lttng_ust_events_exit(void) |
8020ceb5 | 1364 | { |
7dd08bec | 1365 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1366 | |
e58095ef | 1367 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1368 | lttng_session_destroy(session); |
8020ceb5 | 1369 | } |
457a6b58 | 1370 | |
e58095ef MD |
1371 | /* |
1372 | * Enabler management. | |
1373 | */ | |
d871c65b FD |
1374 | struct lttng_event_enabler *lttng_event_enabler_create( |
1375 | enum lttng_enabler_format_type format_type, | |
e58095ef MD |
1376 | struct lttng_ust_event *event_param, |
1377 | struct lttng_channel *chan) | |
457a6b58 | 1378 | { |
d871c65b | 1379 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1380 | |
d871c65b FD |
1381 | event_enabler = zmalloc(sizeof(*event_enabler)); |
1382 | if (!event_enabler) | |
e58095ef | 1383 | return NULL; |
d871c65b FD |
1384 | event_enabler->base.format_type = format_type; |
1385 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1386 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); | |
1387 | memcpy(&event_enabler->base.event_param, event_param, | |
1388 | sizeof(event_enabler->base.event_param)); | |
1389 | event_enabler->chan = chan; | |
e58095ef | 1390 | /* ctx left NULL */ |
d871c65b FD |
1391 | event_enabler->base.enabled = 0; |
1392 | cds_list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); | |
1393 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1394 | ||
1395 | return event_enabler; | |
457a6b58 MD |
1396 | } |
1397 | ||
d8d2416d FD |
1398 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
1399 | struct lttng_event_notifier_group *event_notifier_group, | |
1400 | enum lttng_enabler_format_type format_type, | |
1401 | struct lttng_ust_event_notifier *event_notifier_param) | |
1402 | { | |
1403 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1404 | ||
1405 | event_notifier_enabler = zmalloc(sizeof(*event_notifier_enabler)); | |
1406 | if (!event_notifier_enabler) | |
1407 | return NULL; | |
1408 | event_notifier_enabler->base.format_type = format_type; | |
1409 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
d37ecb3f | 1410 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
d8d2416d FD |
1411 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.excluder_head); |
1412 | ||
1413 | event_notifier_enabler->user_token = event_notifier_param->event.token; | |
9560f5eb | 1414 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
d37ecb3f | 1415 | event_notifier_enabler->num_captures = 0; |
d8d2416d FD |
1416 | |
1417 | memcpy(&event_notifier_enabler->base.event_param.name, | |
1418 | event_notifier_param->event.name, | |
1419 | sizeof(event_notifier_enabler->base.event_param.name)); | |
1420 | event_notifier_enabler->base.event_param.instrumentation = | |
1421 | event_notifier_param->event.instrumentation; | |
1422 | event_notifier_enabler->base.event_param.loglevel = | |
1423 | event_notifier_param->event.loglevel; | |
1424 | event_notifier_enabler->base.event_param.loglevel_type = | |
1425 | event_notifier_param->event.loglevel_type; | |
1426 | ||
1427 | event_notifier_enabler->base.enabled = 0; | |
1428 | event_notifier_enabler->group = event_notifier_group; | |
1429 | ||
1430 | cds_list_add(&event_notifier_enabler->node, | |
1431 | &event_notifier_group->enablers_head); | |
1432 | ||
1433 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1434 | ||
1435 | return event_notifier_enabler; | |
1436 | } | |
1437 | ||
d871c65b | 1438 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1439 | { |
d871c65b FD |
1440 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
1441 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1442 | ||
e58095ef | 1443 | return 0; |
457a6b58 | 1444 | } |
457a6b58 | 1445 | |
d871c65b | 1446 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1447 | { |
d871c65b FD |
1448 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1449 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1450 | ||
e58095ef MD |
1451 | return 0; |
1452 | } | |
457a6b58 | 1453 | |
d871c65b | 1454 | static |
a56fd376 | 1455 | void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
ab89263e | 1456 | struct lttng_ust_bytecode_node **bytecode) |
e58095ef | 1457 | { |
ab89263e MD |
1458 | (*bytecode)->enabler = enabler; |
1459 | cds_list_add_tail(&(*bytecode)->node, &enabler->filter_bytecode_head); | |
1460 | /* Take ownership of bytecode */ | |
1461 | *bytecode = NULL; | |
d871c65b FD |
1462 | } |
1463 | ||
a56fd376 | 1464 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
ab89263e | 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, | |
e9fe6aad | 1476 | struct lttng_ust_excluder_node **excluder) |
0bfb5cbd | 1477 | { |
e9fe6aad MD |
1478 | (*excluder)->enabler = enabler; |
1479 | cds_list_add_tail(&(*excluder)->node, &enabler->excluder_head); | |
1480 | /* Take ownership of excluder */ | |
1481 | *excluder = NULL; | |
d871c65b FD |
1482 | } |
1483 | ||
1484 | int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler, | |
e9fe6aad | 1485 | struct lttng_ust_excluder_node **excluder) |
d871c65b FD |
1486 | { |
1487 | _lttng_enabler_attach_exclusion( | |
1488 | lttng_event_enabler_as_enabler(event_enabler), excluder); | |
1489 | ||
1490 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
0bfb5cbd | 1491 | return 0; |
e58095ef | 1492 | } |
f488575f | 1493 | |
d8d2416d FD |
1494 | int lttng_event_notifier_enabler_enable( |
1495 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1496 | { | |
1497 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
1498 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1499 | ||
1500 | return 0; | |
1501 | } | |
1502 | ||
1503 | int lttng_event_notifier_enabler_disable( | |
1504 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1505 | { | |
1506 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
1507 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1508 | ||
1509 | return 0; | |
1510 | } | |
1511 | ||
a56fd376 | 1512 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
d8d2416d | 1513 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
ab89263e | 1514 | struct lttng_ust_bytecode_node **bytecode) |
d8d2416d | 1515 | { |
a56fd376 | 1516 | _lttng_enabler_attach_filter_bytecode( |
d8d2416d FD |
1517 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
1518 | bytecode); | |
1519 | ||
1520 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1521 | return 0; | |
1522 | } | |
1523 | ||
d37ecb3f FD |
1524 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
1525 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
49cde654 | 1526 | struct lttng_ust_bytecode_node **bytecode) |
d37ecb3f | 1527 | { |
49cde654 | 1528 | (*bytecode)->enabler = lttng_event_notifier_enabler_as_enabler( |
d37ecb3f | 1529 | event_notifier_enabler); |
49cde654 | 1530 | cds_list_add_tail(&(*bytecode)->node, |
d37ecb3f | 1531 | &event_notifier_enabler->capture_bytecode_head); |
49cde654 MD |
1532 | /* Take ownership of bytecode */ |
1533 | *bytecode = NULL; | |
d37ecb3f FD |
1534 | event_notifier_enabler->num_captures++; |
1535 | ||
1536 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1537 | return 0; | |
1538 | } | |
1539 | ||
d8d2416d FD |
1540 | int lttng_event_notifier_enabler_attach_exclusion( |
1541 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
e9fe6aad | 1542 | struct lttng_ust_excluder_node **excluder) |
d8d2416d FD |
1543 | { |
1544 | _lttng_enabler_attach_exclusion( | |
1545 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), | |
1546 | excluder); | |
1547 | ||
1548 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1549 | return 0; | |
1550 | } | |
1551 | ||
e58095ef | 1552 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1553 | union ust_args *uargs, |
e58095ef MD |
1554 | struct lttng_ctx **ctx, struct lttng_session *session) |
1555 | { | |
457a6b58 | 1556 | /* |
e58095ef MD |
1557 | * We cannot attach a context after trace has been started for a |
1558 | * session because the metadata does not allow expressing this | |
1559 | * information outside of the original channel scope. | |
457a6b58 | 1560 | */ |
e58095ef MD |
1561 | if (session->been_active) |
1562 | return -EPERM; | |
457a6b58 | 1563 | |
e58095ef MD |
1564 | switch (context_param->ctx) { |
1565 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1566 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1567 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1568 | { | |
1569 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1570 | ||
1571 | perf_ctx_param = &context_param->u.perf_counter; | |
1572 | return lttng_add_perf_counter_to_ctx( | |
1573 | perf_ctx_param->type, | |
1574 | perf_ctx_param->config, | |
1575 | perf_ctx_param->name, | |
1576 | ctx); | |
1577 | } | |
e58095ef MD |
1578 | case LTTNG_UST_CONTEXT_VTID: |
1579 | return lttng_add_vtid_to_ctx(ctx); | |
1580 | case LTTNG_UST_CONTEXT_VPID: | |
1581 | return lttng_add_vpid_to_ctx(ctx); | |
1582 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1583 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1584 | case LTTNG_UST_CONTEXT_IP: |
1585 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1586 | case LTTNG_UST_CONTEXT_CPU_ID: |
1587 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1588 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1589 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1590 | ctx); | |
735bef47 MJ |
1591 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1592 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1593 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1594 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1595 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1596 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1597 | case LTTNG_UST_CONTEXT_NET_NS: | |
1598 | return lttng_add_net_ns_to_ctx(ctx); | |
1599 | case LTTNG_UST_CONTEXT_PID_NS: | |
1600 | return lttng_add_pid_ns_to_ctx(ctx); | |
cefef7a7 MJ |
1601 | case LTTNG_UST_CONTEXT_TIME_NS: |
1602 | return lttng_add_time_ns_to_ctx(ctx); | |
735bef47 MJ |
1603 | case LTTNG_UST_CONTEXT_USER_NS: |
1604 | return lttng_add_user_ns_to_ctx(ctx); | |
1605 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1606 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1607 | case LTTNG_UST_CONTEXT_VUID: |
1608 | return lttng_add_vuid_to_ctx(ctx); | |
1609 | case LTTNG_UST_CONTEXT_VEUID: | |
1610 | return lttng_add_veuid_to_ctx(ctx); | |
1611 | case LTTNG_UST_CONTEXT_VSUID: | |
1612 | return lttng_add_vsuid_to_ctx(ctx); | |
1613 | case LTTNG_UST_CONTEXT_VGID: | |
1614 | return lttng_add_vgid_to_ctx(ctx); | |
1615 | case LTTNG_UST_CONTEXT_VEGID: | |
1616 | return lttng_add_vegid_to_ctx(ctx); | |
1617 | case LTTNG_UST_CONTEXT_VSGID: | |
1618 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1619 | default: |
1620 | return -EINVAL; | |
457a6b58 | 1621 | } |
457a6b58 MD |
1622 | } |
1623 | ||
d871c65b | 1624 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
e58095ef | 1625 | struct lttng_ust_context *context_param) |
457a6b58 | 1626 | { |
e58095ef | 1627 | return -ENOSYS; |
457a6b58 MD |
1628 | } |
1629 | ||
d871c65b | 1630 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1631 | { |
d871c65b FD |
1632 | if (!event_enabler) { |
1633 | return; | |
0f63324a | 1634 | } |
d871c65b | 1635 | cds_list_del(&event_enabler->node); |
0f63324a | 1636 | |
d871c65b | 1637 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef | 1638 | |
d871c65b FD |
1639 | lttng_destroy_context(event_enabler->ctx); |
1640 | free(event_enabler); | |
457a6b58 MD |
1641 | } |
1642 | ||
e58095ef | 1643 | /* |
d871c65b | 1644 | * lttng_session_sync_event_enablers should be called just before starting a |
e58095ef MD |
1645 | * session. |
1646 | */ | |
457a6b58 | 1647 | static |
d871c65b | 1648 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1649 | { |
d871c65b | 1650 | struct lttng_event_enabler *event_enabler; |
68bb7559 | 1651 | struct lttng_ust_event_private *event_priv; |
457a6b58 | 1652 | |
d871c65b FD |
1653 | cds_list_for_each_entry(event_enabler, &session->enablers_head, node) |
1654 | lttng_event_enabler_ref_events(event_enabler); | |
e58095ef MD |
1655 | /* |
1656 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1657 | * and its channel and session transient states are enabled, we |
1658 | * enable the event, else we disable it. | |
e58095ef | 1659 | */ |
68bb7559 | 1660 | cds_list_for_each_entry(event_priv, &session->events_head, node) { |
e58095ef MD |
1661 | struct lttng_enabler_ref *enabler_ref; |
1662 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1663 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1664 | |
1665 | /* Enable events */ | |
1666 | cds_list_for_each_entry(enabler_ref, | |
68bb7559 | 1667 | &event_priv->enablers_ref_head, node) { |
e58095ef MD |
1668 | if (enabler_ref->ref->enabled) { |
1669 | enabled = 1; | |
1670 | break; | |
1671 | } | |
1672 | } | |
ac6b4ac6 MD |
1673 | /* |
1674 | * Enabled state is based on union of enablers, with | |
1675 | * intesection of session and channel transient enable | |
1676 | * states. | |
1677 | */ | |
68bb7559 | 1678 | enabled = enabled && session->tstate && event_priv->pub->chan->tstate; |
ac6b4ac6 | 1679 | |
68bb7559 | 1680 | CMM_STORE_SHARED(event_priv->pub->enabled, enabled); |
ac6b4ac6 MD |
1681 | /* |
1682 | * Sync tracepoint registration with event enabled | |
1683 | * state. | |
1684 | */ | |
1685 | if (enabled) { | |
68bb7559 MD |
1686 | if (!event_priv->registered) |
1687 | register_event(event_priv->pub); | |
ac6b4ac6 | 1688 | } else { |
68bb7559 MD |
1689 | if (event_priv->registered) |
1690 | unregister_event(event_priv->pub); | |
ac6b4ac6 | 1691 | } |
457a6b58 | 1692 | |
1f49fc05 | 1693 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 | 1694 | cds_list_for_each_entry(enabler_ref, |
68bb7559 | 1695 | &event_priv->enablers_ref_head, node) { |
1f49fc05 MD |
1696 | if (enabler_ref->ref->enabled |
1697 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1698 | has_enablers_without_bytecode = 1; |
1699 | break; | |
1700 | } | |
1701 | } | |
68bb7559 | 1702 | event_priv->pub->has_enablers_without_bytecode = |
dcdeaff0 MD |
1703 | has_enablers_without_bytecode; |
1704 | ||
e58095ef MD |
1705 | /* Enable filters */ |
1706 | cds_list_for_each_entry(runtime, | |
68bb7559 | 1707 | &event_priv->pub->filter_bytecode_runtime_head, node) { |
4d451c15 | 1708 | lttng_bytecode_filter_sync_state(runtime); |
457a6b58 MD |
1709 | } |
1710 | } | |
baa1e0bc | 1711 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1712 | } |
1713 | ||
4296085e MD |
1714 | /* Support for event notifier is introduced by probe provider major version 2. */ |
1715 | static | |
1716 | bool lttng_ust_probe_supports_event_notifier(struct lttng_probe_desc *probe_desc) | |
1717 | { | |
1718 | return probe_desc->major >= 2; | |
1719 | } | |
1720 | ||
d8d2416d FD |
1721 | static |
1722 | void lttng_create_event_notifier_if_missing( | |
1723 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1724 | { | |
1725 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1726 | struct lttng_probe_desc *probe_desc; | |
1727 | struct cds_list_head *probe_list; | |
1728 | int i; | |
1729 | ||
1730 | probe_list = lttng_get_probe_list_head(); | |
1731 | ||
1732 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1733 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1734 | int ret; | |
1735 | bool found = false; | |
1736 | const struct lttng_event_desc *desc; | |
1737 | struct lttng_event_notifier *event_notifier; | |
1738 | struct cds_hlist_head *head; | |
1739 | struct cds_hlist_node *node; | |
1740 | ||
1741 | desc = probe_desc->event_desc[i]; | |
d37ecb3f | 1742 | |
d8d2416d FD |
1743 | if (!lttng_desc_match_enabler(desc, |
1744 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1745 | continue; | |
1746 | ||
1747 | /* | |
1748 | * Given the current event_notifier group, get the bucket that | |
1749 | * the target event_notifier would be if it was already | |
1750 | * created. | |
1751 | */ | |
1752 | head = borrow_hash_table_bucket( | |
1753 | event_notifier_group->event_notifiers_ht.table, | |
1754 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
1755 | ||
1756 | cds_hlist_for_each_entry(event_notifier, node, head, hlist) { | |
1757 | /* | |
1758 | * Check if event_notifier already exists by checking | |
1759 | * if the event_notifier and enabler share the same | |
1760 | * description and id. | |
1761 | */ | |
1762 | if (event_notifier->desc == desc && | |
1763 | event_notifier->user_token == event_notifier_enabler->user_token) { | |
1764 | found = true; | |
1765 | break; | |
1766 | } | |
1767 | } | |
1768 | ||
1769 | if (found) | |
1770 | continue; | |
1771 | ||
4296085e MD |
1772 | /* Check that the probe supports event notifiers, else report the error. */ |
1773 | if (!lttng_ust_probe_supports_event_notifier(probe_desc)) { | |
1774 | ERR("Probe \"%s\" contains event \"%s\" which matches an enabled event notifier, " | |
1775 | "but its version (%u.%u) is too old and does not implement event notifiers. " | |
1776 | "It needs to be recompiled against a newer version of LTTng-UST, otherwise " | |
1777 | "this event will not generate any notification.", | |
1778 | probe_desc->provider, | |
1779 | desc->name, | |
1780 | probe_desc->major, | |
1781 | probe_desc->minor); | |
1782 | continue; | |
1783 | } | |
d8d2416d FD |
1784 | /* |
1785 | * We need to create a event_notifier for this event probe. | |
1786 | */ | |
1787 | ret = lttng_event_notifier_create(desc, | |
1788 | event_notifier_enabler->user_token, | |
6566528b | 1789 | event_notifier_enabler->error_counter_index, |
d8d2416d FD |
1790 | event_notifier_group); |
1791 | if (ret) { | |
1792 | DBG("Unable to create event_notifier %s, error %d\n", | |
1793 | probe_desc->event_desc[i]->name, ret); | |
1794 | } | |
1795 | } | |
1796 | } | |
1797 | } | |
1798 | ||
1799 | /* | |
1800 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
1801 | */ | |
1802 | static | |
1803 | int lttng_event_notifier_enabler_ref_event_notifiers( | |
1804 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1805 | { | |
1806 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1807 | struct lttng_event_notifier *event_notifier; | |
1808 | ||
1809 | /* | |
1810 | * Only try to create event_notifiers for enablers that are enabled, the user | |
1811 | * might still be attaching filter or exclusion to the | |
1812 | * event_notifier_enabler. | |
1813 | */ | |
1814 | if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled) | |
1815 | goto end; | |
1816 | ||
1817 | /* First, ensure that probe event_notifiers are created for this enabler. */ | |
1818 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
1819 | ||
1820 | /* Link the created event_notifier with its associated enabler. */ | |
1821 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1822 | struct lttng_enabler_ref *enabler_ref; | |
1823 | ||
1824 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
1825 | continue; | |
1826 | ||
1827 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
1828 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1829 | if (!enabler_ref) { | |
1830 | /* | |
1831 | * If no backward ref, create it. | |
1832 | * Add backward ref from event_notifier to enabler. | |
1833 | */ | |
1834 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1835 | if (!enabler_ref) | |
1836 | return -ENOMEM; | |
1837 | ||
1838 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
1839 | event_notifier_enabler); | |
1840 | cds_list_add(&enabler_ref->node, | |
1841 | &event_notifier->enablers_ref_head); | |
1842 | } | |
1843 | ||
1844 | /* | |
1845 | * Link filter bytecodes if not linked yet. | |
1846 | */ | |
1847 | lttng_enabler_link_bytecode(event_notifier->desc, | |
621c07fc FD |
1848 | &event_notifier_group->ctx, |
1849 | &event_notifier->filter_bytecode_runtime_head, | |
1850 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); | |
d37ecb3f FD |
1851 | |
1852 | /* | |
1853 | * Link capture bytecodes if not linked yet. | |
1854 | */ | |
1855 | lttng_enabler_link_bytecode(event_notifier->desc, | |
1856 | &event_notifier_group->ctx, &event_notifier->capture_bytecode_runtime_head, | |
1857 | &event_notifier_enabler->capture_bytecode_head); | |
1858 | ||
1859 | event_notifier->num_captures = event_notifier_enabler->num_captures; | |
d8d2416d FD |
1860 | } |
1861 | end: | |
1862 | return 0; | |
1863 | } | |
1864 | ||
1865 | static | |
1866 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
1867 | { | |
1868 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1869 | struct lttng_event_notifier *event_notifier; | |
1870 | ||
1871 | cds_list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
1872 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
1873 | ||
1874 | /* | |
1875 | * For each event_notifier, if at least one of its enablers is enabled, | |
1876 | * we enable the event_notifier, else we disable it. | |
1877 | */ | |
1878 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1879 | struct lttng_enabler_ref *enabler_ref; | |
1880 | struct lttng_bytecode_runtime *runtime; | |
1881 | int enabled = 0, has_enablers_without_bytecode = 0; | |
1882 | ||
1883 | /* Enable event_notifiers */ | |
1884 | cds_list_for_each_entry(enabler_ref, | |
1885 | &event_notifier->enablers_ref_head, node) { | |
1886 | if (enabler_ref->ref->enabled) { | |
1887 | enabled = 1; | |
1888 | break; | |
1889 | } | |
1890 | } | |
1891 | ||
1892 | CMM_STORE_SHARED(event_notifier->enabled, enabled); | |
1893 | /* | |
1894 | * Sync tracepoint registration with event_notifier enabled | |
1895 | * state. | |
1896 | */ | |
1897 | if (enabled) { | |
1898 | if (!event_notifier->registered) | |
1899 | register_event_notifier(event_notifier); | |
1900 | } else { | |
1901 | if (event_notifier->registered) | |
1902 | unregister_event_notifier(event_notifier); | |
1903 | } | |
1904 | ||
1905 | /* Check if has enablers without bytecode enabled */ | |
1906 | cds_list_for_each_entry(enabler_ref, | |
1907 | &event_notifier->enablers_ref_head, node) { | |
1908 | if (enabler_ref->ref->enabled | |
1909 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1910 | has_enablers_without_bytecode = 1; | |
1911 | break; | |
1912 | } | |
1913 | } | |
1914 | event_notifier->has_enablers_without_bytecode = | |
1915 | has_enablers_without_bytecode; | |
1916 | ||
1917 | /* Enable filters */ | |
1918 | cds_list_for_each_entry(runtime, | |
1919 | &event_notifier->filter_bytecode_runtime_head, node) { | |
4d451c15 | 1920 | lttng_bytecode_filter_sync_state(runtime); |
d8d2416d | 1921 | } |
d37ecb3f FD |
1922 | |
1923 | /* Enable captures. */ | |
1924 | cds_list_for_each_entry(runtime, | |
1925 | &event_notifier->capture_bytecode_runtime_head, node) { | |
1926 | lttng_bytecode_capture_sync_state(runtime); | |
1927 | } | |
d8d2416d FD |
1928 | } |
1929 | __tracepoint_probe_prune_release_queue(); | |
1930 | } | |
1931 | ||
e58095ef MD |
1932 | /* |
1933 | * Apply enablers to session events, adding events to session if need | |
1934 | * be. It is required after each modification applied to an active | |
1935 | * session, and right before session "start". | |
1936 | * "lazy" sync means we only sync if required. | |
1937 | */ | |
1938 | static | |
d871c65b | 1939 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1940 | { |
e58095ef MD |
1941 | /* We can skip if session is not active */ |
1942 | if (!session->active) | |
1943 | return; | |
d871c65b | 1944 | lttng_session_sync_event_enablers(session); |
457a6b58 | 1945 | } |
53569322 MD |
1946 | |
1947 | /* | |
1948 | * Update all sessions with the given app context. | |
1949 | * Called with ust lock held. | |
1950 | * This is invoked when an application context gets loaded/unloaded. It | |
1951 | * ensures the context callbacks are in sync with the application | |
1952 | * context (either app context callbacks, or dummy callbacks). | |
1953 | */ | |
1954 | void lttng_ust_context_set_session_provider(const char *name, | |
1955 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1956 | void (*record)(struct lttng_ctx_field *field, | |
1957 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1958 | struct lttng_channel *chan), | |
1959 | void (*get_value)(struct lttng_ctx_field *field, | |
1960 | struct lttng_ctx_value *value)) | |
1961 | { | |
1962 | struct lttng_session *session; | |
1963 | ||
1964 | cds_list_for_each_entry(session, &sessions, node) { | |
1965 | struct lttng_channel *chan; | |
68bb7559 | 1966 | struct lttng_ust_event_private *event_priv; |
53569322 MD |
1967 | int ret; |
1968 | ||
1969 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1970 | name, get_size, record, get_value); | |
1971 | if (ret) | |
1972 | abort(); | |
1973 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1974 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1975 | name, get_size, record, get_value); | |
1976 | if (ret) | |
1977 | abort(); | |
1978 | } | |
68bb7559 MD |
1979 | cds_list_for_each_entry(event_priv, &session->events_head, node) { |
1980 | ret = lttng_ust_context_set_provider_rcu(&event_priv->pub->ctx, | |
53569322 MD |
1981 | name, get_size, record, get_value); |
1982 | if (ret) | |
1983 | abort(); | |
1984 | } | |
1985 | } | |
1986 | } | |
d8d2416d FD |
1987 | |
1988 | /* | |
1989 | * Update all event_notifier groups with the given app context. | |
1990 | * Called with ust lock held. | |
1991 | * This is invoked when an application context gets loaded/unloaded. It | |
1992 | * ensures the context callbacks are in sync with the application | |
1993 | * context (either app context callbacks, or dummy callbacks). | |
1994 | */ | |
1995 | void lttng_ust_context_set_event_notifier_group_provider(const char *name, | |
1996 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1997 | void (*record)(struct lttng_ctx_field *field, | |
1998 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1999 | struct lttng_channel *chan), | |
2000 | void (*get_value)(struct lttng_ctx_field *field, | |
2001 | struct lttng_ctx_value *value)) | |
2002 | { | |
2003 | struct lttng_event_notifier_group *event_notifier_group; | |
2004 | ||
2005 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2006 | int ret; | |
2007 | ||
2008 | ret = lttng_ust_context_set_provider_rcu( | |
2009 | &event_notifier_group->ctx, | |
2010 | name, get_size, record, get_value); | |
2011 | if (ret) | |
2012 | abort(); | |
2013 | } | |
2014 | } |