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 | ||
2e70391c | 73 | static void _lttng_event_recorder_destroy(struct lttng_ust_event_recorder *event_recorder); |
d8d2416d | 74 | static void _lttng_event_notifier_destroy( |
d7d45c0d | 75 | struct lttng_ust_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 | { | |
bdb12629 | 93 | struct lttng_ust_session_private *iter; |
6715d7d1 MD |
94 | |
95 | cds_list_for_each_entry(iter, &sessions, node) { | |
bdb12629 | 96 | if (iter->pub->active) |
6715d7d1 MD |
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, | |
fd17d7ce | 105 | enum lttng_ust_abi_loglevel_type req_type, |
457a6b58 MD |
106 | int req_loglevel) |
107 | { | |
e58095ef MD |
108 | if (!has_loglevel) |
109 | loglevel = TRACE_DEFAULT; | |
457a6b58 | 110 | switch (req_type) { |
fd17d7ce | 111 | case LTTNG_UST_ABI_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; | |
fd17d7ce | 117 | case LTTNG_UST_ABI_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; | |
fd17d7ce | 123 | case LTTNG_UST_ABI_LOGLEVEL_ALL: |
457a6b58 | 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; |
bdb12629 | 135 | struct lttng_ust_session_private *session_priv; |
74d81a6c | 136 | int i; |
8020ceb5 | 137 | |
7dd08bec | 138 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
139 | if (!session) |
140 | return NULL; | |
bd640d74 | 141 | session->struct_size = sizeof(struct lttng_session); |
bdb12629 MD |
142 | session_priv = zmalloc(sizeof(struct lttng_ust_session_private)); |
143 | if (!session_priv) { | |
53569322 MD |
144 | free(session); |
145 | return NULL; | |
146 | } | |
bdb12629 MD |
147 | session->priv = session_priv; |
148 | session_priv->pub = session; | |
149 | if (lttng_context_init_all(&session->priv->ctx)) { | |
150 | free(session_priv); | |
151 | free(session); | |
152 | return NULL; | |
153 | } | |
154 | CDS_INIT_LIST_HEAD(&session->priv->chan_head); | |
155 | CDS_INIT_LIST_HEAD(&session->priv->events_head); | |
156 | CDS_INIT_LIST_HEAD(&session->priv->enums_head); | |
157 | CDS_INIT_LIST_HEAD(&session->priv->enablers_head); | |
d56fa719 | 158 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
bdb12629 | 159 | CDS_INIT_HLIST_HEAD(&session->priv->events_ht.table[i]); |
c785c634 | 160 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
bdb12629 MD |
161 | CDS_INIT_HLIST_HEAD(&session->priv->enums_ht.table[i]); |
162 | cds_list_add(&session->priv->node, &sessions); | |
8020ceb5 MD |
163 | return session; |
164 | } | |
165 | ||
ebabbf58 MD |
166 | struct lttng_counter *lttng_ust_counter_create( |
167 | const char *counter_transport_name, | |
168 | size_t number_dimensions, const struct lttng_counter_dimension *dimensions) | |
169 | { | |
170 | struct lttng_counter_transport *counter_transport = NULL; | |
171 | struct lttng_counter *counter = NULL; | |
172 | ||
173 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
174 | if (!counter_transport) | |
175 | goto notransport; | |
176 | counter = zmalloc(sizeof(struct lttng_counter)); | |
177 | if (!counter) | |
178 | goto nomem; | |
179 | ||
180 | counter->ops = &counter_transport->ops; | |
181 | counter->transport = counter_transport; | |
182 | ||
183 | counter->counter = counter->ops->counter_create( | |
184 | number_dimensions, dimensions, 0, | |
185 | -1, 0, NULL, false); | |
186 | if (!counter->counter) { | |
187 | goto create_error; | |
188 | } | |
189 | ||
190 | return counter; | |
191 | ||
192 | create_error: | |
193 | free(counter); | |
194 | nomem: | |
195 | notransport: | |
196 | return NULL; | |
197 | } | |
198 | ||
199 | static | |
200 | void lttng_ust_counter_destroy(struct lttng_counter *counter) | |
201 | { | |
202 | counter->ops->counter_destroy(counter->counter); | |
203 | free(counter); | |
204 | } | |
205 | ||
d8d2416d FD |
206 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
207 | { | |
208 | struct lttng_event_notifier_group *event_notifier_group; | |
209 | int i; | |
210 | ||
211 | event_notifier_group = zmalloc(sizeof(struct lttng_event_notifier_group)); | |
212 | if (!event_notifier_group) | |
213 | return NULL; | |
214 | ||
51f804ec FD |
215 | /* Add all contexts. */ |
216 | if (lttng_context_init_all(&event_notifier_group->ctx)) { | |
217 | free(event_notifier_group); | |
218 | return NULL; | |
219 | } | |
220 | ||
d8d2416d FD |
221 | CDS_INIT_LIST_HEAD(&event_notifier_group->enablers_head); |
222 | CDS_INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
223 | for (i = 0; i < LTTNG_UST_EVENT_NOTIFIER_HT_SIZE; i++) | |
224 | CDS_INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
225 | ||
226 | cds_list_add(&event_notifier_group->node, &event_notifier_groups); | |
227 | ||
228 | return event_notifier_group; | |
229 | } | |
230 | ||
74d81a6c MD |
231 | /* |
232 | * Only used internally at session destruction. | |
233 | */ | |
234 | static | |
235 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
236 | { | |
237 | struct channel *chan; | |
238 | struct lttng_ust_shm_handle *handle; | |
239 | ||
240 | cds_list_del(<tng_chan->node); | |
241 | lttng_destroy_context(lttng_chan->ctx); | |
242 | chan = lttng_chan->chan; | |
243 | handle = lttng_chan->handle; | |
244 | /* | |
245 | * note: lttng_chan is private data contained within handle. It | |
246 | * will be freed along with the handle. | |
247 | */ | |
248 | channel_destroy(chan, handle, 0); | |
249 | } | |
250 | ||
ac6b4ac6 | 251 | static |
2e70391c | 252 | void register_event_recorder(struct lttng_ust_event_recorder *event_recorder) |
ac6b4ac6 MD |
253 | { |
254 | int ret; | |
255 | const struct lttng_event_desc *desc; | |
256 | ||
2e70391c MD |
257 | assert(event_recorder->parent->priv->registered == 0); |
258 | desc = event_recorder->parent->priv->desc; | |
baa1e0bc | 259 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 | 260 | desc->probe_callback, |
2e70391c | 261 | event_recorder, desc->signature); |
ac6b4ac6 MD |
262 | WARN_ON_ONCE(ret); |
263 | if (!ret) | |
2e70391c | 264 | event_recorder->parent->priv->registered = 1; |
ac6b4ac6 MD |
265 | } |
266 | ||
d8d2416d | 267 | static |
d7d45c0d | 268 | void register_event_notifier(struct lttng_ust_event_notifier *event_notifier) |
d8d2416d FD |
269 | { |
270 | int ret; | |
271 | const struct lttng_event_desc *desc; | |
272 | ||
115db533 MD |
273 | assert(event_notifier->parent->priv->registered == 0); |
274 | desc = event_notifier->parent->priv->desc; | |
d8d2416d FD |
275 | ret = __tracepoint_probe_register_queue_release(desc->name, |
276 | desc->u.ext.event_notifier_callback, event_notifier, desc->signature); | |
277 | WARN_ON_ONCE(ret); | |
278 | if (!ret) | |
115db533 | 279 | event_notifier->parent->priv->registered = 1; |
d8d2416d FD |
280 | } |
281 | ||
ac6b4ac6 | 282 | static |
2e70391c | 283 | void unregister_event_recorder(struct lttng_ust_event_recorder *event_recorder) |
ac6b4ac6 MD |
284 | { |
285 | int ret; | |
286 | const struct lttng_event_desc *desc; | |
287 | ||
2e70391c MD |
288 | assert(event_recorder->parent->priv->registered == 1); |
289 | desc = event_recorder->parent->priv->desc; | |
baa1e0bc | 290 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 | 291 | desc->probe_callback, |
2e70391c | 292 | event_recorder); |
ac6b4ac6 MD |
293 | WARN_ON_ONCE(ret); |
294 | if (!ret) | |
2e70391c | 295 | event_recorder->parent->priv->registered = 0; |
ac6b4ac6 MD |
296 | } |
297 | ||
d8d2416d | 298 | static |
d7d45c0d | 299 | void unregister_event_notifier(struct lttng_ust_event_notifier *event_notifier) |
d8d2416d FD |
300 | { |
301 | int ret; | |
302 | const struct lttng_event_desc *desc; | |
303 | ||
115db533 MD |
304 | assert(event_notifier->parent->priv->registered == 1); |
305 | desc = event_notifier->parent->priv->desc; | |
d8d2416d FD |
306 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
307 | desc->u.ext.event_notifier_callback, event_notifier); | |
308 | WARN_ON_ONCE(ret); | |
309 | if (!ret) | |
115db533 | 310 | event_notifier->parent->priv->registered = 0; |
d8d2416d FD |
311 | } |
312 | ||
ac6b4ac6 MD |
313 | /* |
314 | * Only used internally at session destruction. | |
315 | */ | |
316 | static | |
2e70391c | 317 | void _lttng_event_recorder_unregister(struct lttng_ust_event_recorder *event_recorder) |
ac6b4ac6 | 318 | { |
2e70391c MD |
319 | if (event_recorder->parent->priv->registered) |
320 | unregister_event_recorder(event_recorder); | |
ac6b4ac6 MD |
321 | } |
322 | ||
d8d2416d FD |
323 | /* |
324 | * Only used internally at session destruction. | |
325 | */ | |
326 | static | |
d7d45c0d | 327 | void _lttng_event_notifier_unregister(struct lttng_ust_event_notifier *event_notifier) |
d8d2416d | 328 | { |
115db533 | 329 | if (event_notifier->parent->priv->registered) |
d8d2416d FD |
330 | unregister_event_notifier(event_notifier); |
331 | } | |
332 | ||
7dd08bec | 333 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 334 | { |
7dd08bec | 335 | struct lttng_channel *chan, *tmpchan; |
2e70391c | 336 | struct lttng_ust_event_recorder_private *event_recorder_priv, *tmpevent_recorder_priv; |
c785c634 | 337 | struct lttng_enum *_enum, *tmp_enum; |
d871c65b | 338 | struct lttng_event_enabler *event_enabler, *event_tmpenabler; |
8020ceb5 | 339 | |
b5234c06 | 340 | CMM_ACCESS_ONCE(session->active) = 0; |
2e70391c MD |
341 | cds_list_for_each_entry(event_recorder_priv, &session->priv->events_head, node) { |
342 | _lttng_event_recorder_unregister(event_recorder_priv->pub); | |
8020ceb5 | 343 | } |
b653ddc1 | 344 | lttng_ust_urcu_synchronize_rcu(); /* Wait for in-flight events to complete */ |
baa1e0bc | 345 | __tracepoint_probe_prune_release_queue(); |
d871c65b | 346 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
bdb12629 | 347 | &session->priv->enablers_head, node) |
d871c65b | 348 | lttng_event_enabler_destroy(event_enabler); |
2e70391c | 349 | cds_list_for_each_entry_safe(event_recorder_priv, tmpevent_recorder_priv, |
bdb12629 | 350 | &session->priv->events_head, node) |
2e70391c | 351 | _lttng_event_recorder_destroy(event_recorder_priv->pub); |
c785c634 | 352 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
bdb12629 | 353 | &session->priv->enums_head, node) |
c785c634 | 354 | _lttng_enum_destroy(_enum); |
bdb12629 | 355 | cds_list_for_each_entry_safe(chan, tmpchan, &session->priv->chan_head, node) |
74d81a6c | 356 | _lttng_channel_unmap(chan); |
bdb12629 MD |
357 | cds_list_del(&session->priv->node); |
358 | lttng_destroy_context(session->priv->ctx); | |
359 | free(session->priv); | |
b5234c06 | 360 | free(session); |
8020ceb5 MD |
361 | } |
362 | ||
d8d2416d FD |
363 | void lttng_event_notifier_group_destroy( |
364 | struct lttng_event_notifier_group *event_notifier_group) | |
365 | { | |
366 | int close_ret; | |
367 | struct lttng_event_notifier_enabler *notifier_enabler, *tmpnotifier_enabler; | |
115db533 | 368 | struct lttng_ust_event_notifier_private *notifier_priv, *tmpnotifier_priv; |
d8d2416d FD |
369 | |
370 | if (!event_notifier_group) { | |
371 | return; | |
372 | } | |
373 | ||
115db533 | 374 | cds_list_for_each_entry(notifier_priv, |
d8d2416d | 375 | &event_notifier_group->event_notifiers_head, node) |
115db533 | 376 | _lttng_event_notifier_unregister(notifier_priv->pub); |
d8d2416d | 377 | |
b653ddc1 | 378 | lttng_ust_urcu_synchronize_rcu(); |
d8d2416d FD |
379 | |
380 | cds_list_for_each_entry_safe(notifier_enabler, tmpnotifier_enabler, | |
381 | &event_notifier_group->enablers_head, node) | |
382 | lttng_event_notifier_enabler_destroy(notifier_enabler); | |
383 | ||
115db533 | 384 | cds_list_for_each_entry_safe(notifier_priv, tmpnotifier_priv, |
d8d2416d | 385 | &event_notifier_group->event_notifiers_head, node) |
115db533 | 386 | _lttng_event_notifier_destroy(notifier_priv->pub); |
d8d2416d | 387 | |
ebabbf58 MD |
388 | if (event_notifier_group->error_counter) |
389 | lttng_ust_counter_destroy(event_notifier_group->error_counter); | |
390 | ||
391 | /* Close the notification fd to the listener of event_notifiers. */ | |
d8d2416d FD |
392 | |
393 | lttng_ust_lock_fd_tracker(); | |
394 | close_ret = close(event_notifier_group->notification_fd); | |
395 | if (!close_ret) { | |
396 | lttng_ust_delete_fd_from_tracker( | |
397 | event_notifier_group->notification_fd); | |
398 | } else { | |
399 | PERROR("close"); | |
400 | abort(); | |
401 | } | |
402 | lttng_ust_unlock_fd_tracker(); | |
403 | ||
404 | cds_list_del(&event_notifier_group->node); | |
405 | ||
406 | free(event_notifier_group); | |
407 | } | |
408 | ||
d871c65b FD |
409 | static |
410 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
411 | { | |
ab249ecf | 412 | struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node; |
d871c65b FD |
413 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
414 | ||
415 | if (!enabler) { | |
416 | return; | |
417 | } | |
418 | ||
419 | /* Destroy filter bytecode */ | |
420 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
421 | &enabler->filter_bytecode_head, node) { | |
422 | free(filter_node); | |
423 | } | |
424 | ||
425 | /* Destroy excluders */ | |
426 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
427 | &enabler->excluder_head, node) { | |
428 | free(excluder_node); | |
429 | } | |
430 | } | |
431 | ||
d8d2416d FD |
432 | void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler) |
433 | { | |
434 | if (!event_notifier_enabler) { | |
435 | return; | |
436 | } | |
437 | ||
438 | cds_list_del(&event_notifier_enabler->node); | |
439 | ||
440 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
441 | ||
442 | free(event_notifier_enabler); | |
443 | } | |
444 | ||
53569322 MD |
445 | static |
446 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
447 | struct lttng_session *session) | |
448 | { | |
449 | const char *enum_name = desc->name; | |
450 | struct lttng_enum *_enum; | |
451 | struct cds_hlist_head *head; | |
53569322 MD |
452 | int ret = 0; |
453 | size_t name_len = strlen(enum_name); | |
454 | uint32_t hash; | |
455 | int notify_socket; | |
456 | ||
b33b46f7 | 457 | /* Check if this enum is already registered for this session. */ |
53569322 | 458 | hash = jhash(enum_name, name_len, 0); |
bdb12629 | 459 | head = &session->priv->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; |
b33b46f7 FD |
460 | |
461 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
462 | if (_enum) { | |
463 | ret = -EEXIST; | |
464 | goto exist; | |
53569322 MD |
465 | } |
466 | ||
bdb12629 | 467 | notify_socket = lttng_get_notify_socket(session->priv->owner); |
53569322 MD |
468 | if (notify_socket < 0) { |
469 | ret = notify_socket; | |
470 | goto socket_error; | |
471 | } | |
472 | ||
473 | _enum = zmalloc(sizeof(*_enum)); | |
474 | if (!_enum) { | |
475 | ret = -ENOMEM; | |
476 | goto cache_error; | |
477 | } | |
478 | _enum->session = session; | |
479 | _enum->desc = desc; | |
480 | ||
481 | ret = ustcomm_register_enum(notify_socket, | |
bdb12629 | 482 | session->priv->objd, |
53569322 MD |
483 | enum_name, |
484 | desc->nr_entries, | |
485 | desc->entries, | |
486 | &_enum->id); | |
487 | if (ret < 0) { | |
488 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
489 | goto sessiond_register_error; | |
490 | } | |
bdb12629 | 491 | cds_list_add(&_enum->node, &session->priv->enums_head); |
53569322 MD |
492 | cds_hlist_add_head(&_enum->hlist, head); |
493 | return 0; | |
494 | ||
495 | sessiond_register_error: | |
496 | free(_enum); | |
497 | cache_error: | |
498 | socket_error: | |
499 | exist: | |
500 | return ret; | |
501 | } | |
502 | ||
503 | static | |
504 | int lttng_create_enum_check(const struct lttng_type *type, | |
505 | struct lttng_session *session) | |
506 | { | |
507 | switch (type->atype) { | |
218deb69 MD |
508 | case atype_enum_nestable: |
509 | { | |
510 | const struct lttng_enum_desc *enum_desc; | |
511 | int ret; | |
512 | ||
513 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
514 | ret = lttng_enum_create(enum_desc, session); |
515 | if (ret && ret != -EEXIST) { | |
516 | DBG("Unable to create enum error: (%d)", ret); | |
517 | return ret; | |
518 | } | |
519 | break; | |
520 | } | |
521 | case atype_dynamic: | |
522 | { | |
523 | const struct lttng_event_field *tag_field_generic; | |
524 | const struct lttng_enum_desc *enum_desc; | |
525 | int ret; | |
526 | ||
527 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 528 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
529 | ret = lttng_enum_create(enum_desc, session); |
530 | if (ret && ret != -EEXIST) { | |
531 | DBG("Unable to create enum error: (%d)", ret); | |
532 | return ret; | |
533 | } | |
534 | break; | |
535 | } | |
536 | default: | |
537 | /* TODO: nested types when they become supported. */ | |
538 | break; | |
539 | } | |
540 | return 0; | |
541 | } | |
542 | ||
543 | static | |
544 | int lttng_create_all_event_enums(size_t nr_fields, | |
545 | const struct lttng_event_field *event_fields, | |
546 | struct lttng_session *session) | |
547 | { | |
548 | size_t i; | |
549 | int ret; | |
550 | ||
551 | /* For each field, ensure enum is part of the session. */ | |
552 | for (i = 0; i < nr_fields; i++) { | |
553 | const struct lttng_type *type = &event_fields[i].type; | |
554 | ||
555 | ret = lttng_create_enum_check(type, session); | |
556 | if (ret) | |
557 | return ret; | |
558 | } | |
559 | return 0; | |
560 | } | |
561 | ||
562 | static | |
563 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
564 | const struct lttng_ctx_field *ctx_fields, | |
565 | struct lttng_session *session) | |
566 | { | |
567 | size_t i; | |
568 | int ret; | |
569 | ||
570 | /* For each field, ensure enum is part of the session. */ | |
571 | for (i = 0; i < nr_fields; i++) { | |
572 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
573 | ||
574 | ret = lttng_create_enum_check(type, session); | |
575 | if (ret) | |
576 | return ret; | |
577 | } | |
578 | return 0; | |
579 | } | |
580 | ||
710b8ee3 MD |
581 | /* |
582 | * Ensure that a state-dump will be performed for this session at the end | |
583 | * of the current handle_message(). | |
584 | */ | |
585 | int lttng_session_statedump(struct lttng_session *session) | |
586 | { | |
bdb12629 MD |
587 | session->priv->statedump_pending = 1; |
588 | lttng_ust_sockinfo_session_enabled(session->priv->owner); | |
710b8ee3 MD |
589 | return 0; |
590 | } | |
53569322 | 591 | |
7dd08bec | 592 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
593 | { |
594 | int ret = 0; | |
7dd08bec | 595 | struct lttng_channel *chan; |
32ce8569 | 596 | int notify_socket; |
8020ceb5 | 597 | |
8020ceb5 MD |
598 | if (session->active) { |
599 | ret = -EBUSY; | |
600 | goto end; | |
601 | } | |
602 | ||
bdb12629 | 603 | notify_socket = lttng_get_notify_socket(session->priv->owner); |
32ce8569 MD |
604 | if (notify_socket < 0) |
605 | return notify_socket; | |
606 | ||
ac6b4ac6 | 607 | /* Set transient enabler state to "enabled" */ |
bdb12629 | 608 | session->priv->tstate = 1; |
e58095ef | 609 | |
3ff7660f | 610 | /* We need to sync enablers with session before activation. */ |
d871c65b | 611 | lttng_session_sync_event_enablers(session); |
3ff7660f | 612 | |
8020ceb5 MD |
613 | /* |
614 | * Snapshot the number of events per channel to know the type of header | |
615 | * we need to use. | |
616 | */ | |
bdb12629 | 617 | cds_list_for_each_entry(chan, &session->priv->chan_head, node) { |
32ce8569 | 618 | const struct lttng_ctx *ctx; |
83e43212 | 619 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 620 | size_t nr_fields = 0; |
6ca18e66 | 621 | uint32_t chan_id; |
32ce8569 MD |
622 | |
623 | /* don't change it if session stop/restart */ | |
8020ceb5 | 624 | if (chan->header_type) |
32ce8569 MD |
625 | continue; |
626 | ctx = chan->ctx; | |
627 | if (ctx) { | |
628 | nr_fields = ctx->nr_fields; | |
83e43212 | 629 | fields = ctx->fields; |
53569322 MD |
630 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
631 | session); | |
632 | if (ret < 0) { | |
633 | DBG("Error (%d) adding enum to session", ret); | |
634 | return ret; | |
635 | } | |
32ce8569 MD |
636 | } |
637 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 638 | session, |
bdb12629 | 639 | session->priv->objd, |
32ce8569 MD |
640 | chan->objd, |
641 | nr_fields, | |
642 | fields, | |
6ca18e66 | 643 | &chan_id, |
32ce8569 | 644 | &chan->header_type); |
b869b5ae MD |
645 | if (ret) { |
646 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 647 | return ret; |
b869b5ae | 648 | } |
6ca18e66 MD |
649 | if (chan_id != chan->id) { |
650 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
651 | chan_id, chan->id); | |
652 | return -EINVAL; | |
653 | } | |
8020ceb5 MD |
654 | } |
655 | ||
ac6b4ac6 | 656 | /* Set atomically the state to "active" */ |
b5234c06 | 657 | CMM_ACCESS_ONCE(session->active) = 1; |
bdb12629 | 658 | CMM_ACCESS_ONCE(session->priv->been_active) = 1; |
95c25348 | 659 | |
710b8ee3 MD |
660 | ret = lttng_session_statedump(session); |
661 | if (ret) | |
662 | return ret; | |
8020ceb5 | 663 | end: |
8020ceb5 MD |
664 | return ret; |
665 | } | |
666 | ||
7dd08bec | 667 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
668 | { |
669 | int ret = 0; | |
670 | ||
8020ceb5 MD |
671 | if (!session->active) { |
672 | ret = -EBUSY; | |
673 | goto end; | |
674 | } | |
ac6b4ac6 | 675 | /* Set atomically the state to "inactive" */ |
b5234c06 | 676 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
677 | |
678 | /* Set transient enabler state to "disabled" */ | |
bdb12629 | 679 | session->priv->tstate = 0; |
d871c65b | 680 | lttng_session_sync_event_enablers(session); |
8020ceb5 | 681 | end: |
8020ceb5 MD |
682 | return ret; |
683 | } | |
684 | ||
7dd08bec | 685 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 686 | { |
ac6b4ac6 | 687 | int ret = 0; |
976fe9ea | 688 | |
ac6b4ac6 MD |
689 | if (channel->enabled) { |
690 | ret = -EBUSY; | |
691 | goto end; | |
692 | } | |
693 | /* Set transient enabler state to "enabled" */ | |
694 | channel->tstate = 1; | |
d871c65b | 695 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
696 | /* Set atomically the state to "enabled" */ |
697 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
698 | end: | |
699 | return ret; | |
976fe9ea MD |
700 | } |
701 | ||
7dd08bec | 702 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 703 | { |
ac6b4ac6 | 704 | int ret = 0; |
976fe9ea | 705 | |
ac6b4ac6 MD |
706 | if (!channel->enabled) { |
707 | ret = -EBUSY; | |
708 | goto end; | |
709 | } | |
710 | /* Set atomically the state to "disabled" */ | |
711 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
712 | /* Set transient enabler state to "enabled" */ | |
713 | channel->tstate = 0; | |
d871c65b | 714 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
715 | end: |
716 | return ret; | |
976fe9ea MD |
717 | } |
718 | ||
fb470188 FD |
719 | static inline |
720 | struct cds_hlist_head *borrow_hash_table_bucket( | |
721 | struct cds_hlist_head *hash_table, | |
722 | unsigned int hash_table_size, | |
723 | const struct lttng_event_desc *desc) | |
724 | { | |
725 | const char *event_name; | |
726 | size_t name_len; | |
727 | uint32_t hash; | |
728 | ||
729 | event_name = desc->name; | |
730 | name_len = strlen(event_name); | |
731 | ||
732 | hash = jhash(event_name, name_len, 0); | |
733 | return &hash_table[hash & (hash_table_size - 1)]; | |
734 | } | |
735 | ||
8020ceb5 MD |
736 | /* |
737 | * Supports event creation while tracing session is active. | |
738 | */ | |
e58095ef | 739 | static |
2e70391c | 740 | int lttng_event_recorder_create(const struct lttng_event_desc *desc, |
e58095ef | 741 | struct lttng_channel *chan) |
8020ceb5 | 742 | { |
2e70391c MD |
743 | struct lttng_ust_event_recorder *event_recorder; |
744 | struct lttng_ust_event_recorder_private *event_recorder_priv; | |
32ce8569 | 745 | struct lttng_session *session = chan->session; |
d56fa719 | 746 | struct cds_hlist_head *head; |
576599a0 | 747 | int ret = 0; |
32ce8569 MD |
748 | int notify_socket, loglevel; |
749 | const char *uri; | |
8020ceb5 | 750 | |
bdb12629 | 751 | head = borrow_hash_table_bucket(chan->session->priv->events_ht.table, |
fb470188 | 752 | LTTNG_UST_EVENT_HT_SIZE, desc); |
457a6b58 | 753 | |
bdb12629 | 754 | notify_socket = lttng_get_notify_socket(session->priv->owner); |
32ce8569 MD |
755 | if (notify_socket < 0) { |
756 | ret = notify_socket; | |
757 | goto socket_error; | |
758 | } | |
759 | ||
53569322 MD |
760 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
761 | session); | |
c785c634 MD |
762 | if (ret < 0) { |
763 | DBG("Error (%d) adding enum to session", ret); | |
764 | goto create_enum_error; | |
765 | } | |
766 | ||
457a6b58 MD |
767 | /* |
768 | * Check if loglevel match. Refuse to connect event if not. | |
769 | */ | |
2e70391c MD |
770 | event_recorder = zmalloc(sizeof(struct lttng_ust_event_recorder)); |
771 | if (!event_recorder) { | |
576599a0 | 772 | ret = -ENOMEM; |
8020ceb5 | 773 | goto cache_error; |
576599a0 | 774 | } |
2e70391c | 775 | event_recorder->struct_size = sizeof(struct lttng_ust_event_recorder); |
80333dfa | 776 | |
7ee76145 | 777 | event_recorder->parent = zmalloc(sizeof(struct lttng_ust_event_common)); |
2e70391c | 778 | if (!event_recorder->parent) { |
80333dfa MD |
779 | ret = -ENOMEM; |
780 | goto parent_error; | |
781 | } | |
7ee76145 | 782 | event_recorder->parent->struct_size = sizeof(struct lttng_ust_event_common); |
80333dfa | 783 | |
2e70391c MD |
784 | event_recorder_priv = zmalloc(sizeof(struct lttng_ust_event_recorder_private)); |
785 | if (!event_recorder_priv) { | |
68bb7559 MD |
786 | ret = -ENOMEM; |
787 | goto priv_error; | |
788 | } | |
2e70391c MD |
789 | event_recorder->priv = event_recorder_priv; |
790 | event_recorder_priv->pub = event_recorder; | |
791 | event_recorder->parent->priv = &event_recorder_priv->parent; | |
792 | event_recorder_priv->parent.pub = event_recorder->parent; | |
80333dfa | 793 | |
2e70391c | 794 | event_recorder->chan = chan; |
e58095ef | 795 | |
ac6b4ac6 | 796 | /* Event will be enabled by enabler sync. */ |
2e70391c MD |
797 | event_recorder->parent->enabled = 0; |
798 | event_recorder->parent->priv->registered = 0; | |
799 | CDS_INIT_LIST_HEAD(&event_recorder->parent->filter_bytecode_runtime_head); | |
800 | CDS_INIT_LIST_HEAD(&event_recorder->parent->priv->enablers_ref_head); | |
801 | event_recorder->parent->priv->desc = desc; | |
32ce8569 MD |
802 | |
803 | if (desc->loglevel) | |
2e70391c | 804 | loglevel = *(*event_recorder->parent->priv->desc->loglevel); |
32ce8569 MD |
805 | else |
806 | loglevel = TRACE_DEFAULT; | |
807 | if (desc->u.ext.model_emf_uri) | |
808 | uri = *(desc->u.ext.model_emf_uri); | |
809 | else | |
810 | uri = NULL; | |
811 | ||
13b21cd6 MD |
812 | /* Fetch event ID from sessiond */ |
813 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 814 | session, |
bdb12629 | 815 | session->priv->objd, |
13b21cd6 | 816 | chan->objd, |
fb470188 | 817 | desc->name, |
13b21cd6 MD |
818 | loglevel, |
819 | desc->signature, | |
820 | desc->nr_fields, | |
821 | desc->fields, | |
822 | uri, | |
2e70391c | 823 | &event_recorder->id); |
13b21cd6 MD |
824 | if (ret < 0) { |
825 | DBG("Error (%d) registering event to sessiond", ret); | |
826 | goto sessiond_register_error; | |
32ce8569 | 827 | } |
2b213b16 | 828 | |
2e70391c MD |
829 | cds_list_add(&event_recorder->priv->node, &chan->session->priv->events_head); |
830 | cds_hlist_add_head(&event_recorder->priv->hlist, head); | |
576599a0 | 831 | return 0; |
8020ceb5 | 832 | |
32ce8569 | 833 | sessiond_register_error: |
2e70391c | 834 | free(event_recorder_priv); |
68bb7559 | 835 | priv_error: |
2e70391c | 836 | free(event_recorder->parent); |
80333dfa | 837 | parent_error: |
2e70391c | 838 | free(event_recorder); |
8020ceb5 | 839 | cache_error: |
c785c634 | 840 | create_enum_error: |
32ce8569 | 841 | socket_error: |
576599a0 | 842 | return ret; |
8020ceb5 MD |
843 | } |
844 | ||
d8d2416d FD |
845 | static |
846 | int lttng_event_notifier_create(const struct lttng_event_desc *desc, | |
6566528b | 847 | uint64_t token, uint64_t error_counter_index, |
d8d2416d FD |
848 | struct lttng_event_notifier_group *event_notifier_group) |
849 | { | |
d7d45c0d | 850 | struct lttng_ust_event_notifier *event_notifier; |
115db533 | 851 | struct lttng_ust_event_notifier_private *event_notifier_priv; |
d8d2416d FD |
852 | struct cds_hlist_head *head; |
853 | int ret = 0; | |
854 | ||
855 | /* | |
856 | * Get the hashtable bucket the created lttng_event_notifier object | |
857 | * should be inserted. | |
858 | */ | |
859 | head = borrow_hash_table_bucket( | |
860 | event_notifier_group->event_notifiers_ht.table, | |
861 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
862 | ||
d7d45c0d | 863 | event_notifier = zmalloc(sizeof(struct lttng_ust_event_notifier)); |
d8d2416d FD |
864 | if (!event_notifier) { |
865 | ret = -ENOMEM; | |
866 | goto error; | |
867 | } | |
d7d45c0d | 868 | event_notifier->struct_size = sizeof(struct lttng_ust_event_notifier); |
d8d2416d | 869 | |
115db533 MD |
870 | event_notifier->parent = zmalloc(sizeof(struct lttng_ust_event_common)); |
871 | if (!event_notifier->parent) { | |
872 | ret = -ENOMEM; | |
873 | goto parent_error; | |
874 | } | |
875 | event_notifier->parent->struct_size = sizeof(struct lttng_ust_event_common); | |
876 | ||
877 | event_notifier_priv = zmalloc(sizeof(struct lttng_ust_event_notifier_private)); | |
878 | if (!event_notifier_priv) { | |
879 | ret = -ENOMEM; | |
880 | goto priv_error; | |
881 | } | |
882 | event_notifier->priv = event_notifier_priv; | |
883 | event_notifier_priv->pub = event_notifier; | |
884 | event_notifier->parent->priv = &event_notifier_priv->parent; | |
885 | event_notifier_priv->parent.pub = event_notifier->parent; | |
886 | ||
887 | event_notifier_priv->group = event_notifier_group; | |
888 | event_notifier_priv->parent.user_token = token; | |
889 | event_notifier_priv->error_counter_index = error_counter_index; | |
d8d2416d FD |
890 | |
891 | /* Event notifier will be enabled by enabler sync. */ | |
115db533 MD |
892 | event_notifier->parent->enabled = 0; |
893 | event_notifier_priv->parent.registered = 0; | |
d8d2416d | 894 | |
115db533 | 895 | CDS_INIT_LIST_HEAD(&event_notifier->parent->filter_bytecode_runtime_head); |
d37ecb3f | 896 | CDS_INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head); |
115db533 MD |
897 | CDS_INIT_LIST_HEAD(&event_notifier_priv->parent.enablers_ref_head); |
898 | event_notifier_priv->parent.desc = desc; | |
cab88ff8 | 899 | event_notifier->notification_send = lttng_event_notifier_notification_send; |
d8d2416d | 900 | |
115db533 | 901 | cds_list_add(&event_notifier_priv->node, |
d8d2416d | 902 | &event_notifier_group->event_notifiers_head); |
115db533 | 903 | cds_hlist_add_head(&event_notifier_priv->hlist, head); |
d8d2416d FD |
904 | |
905 | return 0; | |
906 | ||
115db533 MD |
907 | priv_error: |
908 | free(event_notifier->parent); | |
909 | parent_error: | |
910 | free(event_notifier); | |
d8d2416d FD |
911 | error: |
912 | return ret; | |
913 | } | |
914 | ||
915 | static | |
d7d45c0d | 916 | void _lttng_event_notifier_destroy(struct lttng_ust_event_notifier *event_notifier) |
d8d2416d FD |
917 | { |
918 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
919 | ||
920 | /* Remove from event_notifier list. */ | |
115db533 | 921 | cds_list_del(&event_notifier->priv->node); |
d8d2416d | 922 | /* Remove from event_notifier hash table. */ |
115db533 | 923 | cds_hlist_del(&event_notifier->priv->hlist); |
d8d2416d | 924 | |
b1f720f0 | 925 | lttng_free_event_filter_runtime(event_notifier->parent); |
d8d2416d FD |
926 | |
927 | /* Free event_notifier enabler refs */ | |
928 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
115db533 | 929 | &event_notifier->priv->parent.enablers_ref_head, node) |
d8d2416d | 930 | free(enabler_ref); |
115db533 MD |
931 | free(event_notifier->priv); |
932 | free(event_notifier->parent); | |
d8d2416d FD |
933 | free(event_notifier); |
934 | } | |
935 | ||
e58095ef | 936 | static |
196ec2df | 937 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
938 | struct lttng_enabler *enabler) |
939 | { | |
940 | int loglevel = 0; | |
7e2e405c | 941 | unsigned int has_loglevel = 0; |
e58095ef | 942 | |
e450e339 | 943 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f6f42e6 MD |
944 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
945 | desc->name, SIZE_MAX)) | |
e58095ef MD |
946 | return 0; |
947 | if (desc->loglevel) { | |
948 | loglevel = *(*desc->loglevel); | |
949 | has_loglevel = 1; | |
950 | } | |
951 | if (!lttng_loglevel_match(loglevel, | |
952 | has_loglevel, | |
953 | enabler->event_param.loglevel_type, | |
954 | enabler->event_param.loglevel)) | |
955 | return 0; | |
956 | return 1; | |
957 | } | |
958 | ||
959 | static | |
960 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
961 | struct lttng_enabler *enabler) | |
962 | { | |
963 | int loglevel = 0; | |
964 | unsigned int has_loglevel = 0; | |
965 | ||
e450e339 | 966 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
e58095ef MD |
967 | if (strcmp(desc->name, enabler->event_param.name)) |
968 | return 0; | |
969 | if (desc->loglevel) { | |
970 | loglevel = *(*desc->loglevel); | |
971 | has_loglevel = 1; | |
972 | } | |
973 | if (!lttng_loglevel_match(loglevel, | |
974 | has_loglevel, | |
975 | enabler->event_param.loglevel_type, | |
976 | enabler->event_param.loglevel)) | |
977 | return 0; | |
978 | return 1; | |
979 | } | |
980 | ||
981 | static | |
982 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
983 | struct lttng_enabler *enabler) | |
984 | { | |
e450e339 FD |
985 | switch (enabler->format_type) { |
986 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
196ec2df PP |
987 | { |
988 | struct lttng_ust_excluder_node *excluder; | |
989 | ||
990 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
991 | return 0; | |
992 | } | |
993 | ||
994 | /* | |
995 | * If the matching event matches with an excluder, | |
996 | * return 'does not match' | |
997 | */ | |
998 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
999 | int count; | |
1000 | ||
1001 | for (count = 0; count < excluder->excluder.count; count++) { | |
1002 | int len; | |
1003 | char *excluder_name; | |
1004 | ||
1005 | excluder_name = (char *) (excluder->excluder.names) | |
fd17d7ce MD |
1006 | + count * LTTNG_UST_ABI_SYM_NAME_LEN; |
1007 | len = strnlen(excluder_name, LTTNG_UST_ABI_SYM_NAME_LEN); | |
1f6f42e6 | 1008 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 1009 | return 0; |
ed5b5bbd JI |
1010 | } |
1011 | } | |
196ec2df | 1012 | return 1; |
ed5b5bbd | 1013 | } |
e450e339 | 1014 | case LTTNG_ENABLER_FORMAT_EVENT: |
e58095ef MD |
1015 | return lttng_desc_match_event_enabler(desc, enabler); |
1016 | default: | |
1017 | return -EINVAL; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | static | |
d871c65b | 1022 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
2e70391c | 1023 | struct lttng_ust_event_recorder *event_recorder) |
e58095ef | 1024 | { |
2e70391c | 1025 | if (lttng_desc_match_enabler(event_recorder->parent->priv->desc, |
d871c65b | 1026 | lttng_event_enabler_as_enabler(event_enabler)) |
2e70391c | 1027 | && event_recorder->chan == event_enabler->chan) |
d970f72e MD |
1028 | return 1; |
1029 | else | |
1030 | return 0; | |
e58095ef MD |
1031 | } |
1032 | ||
d8d2416d FD |
1033 | static |
1034 | int lttng_event_notifier_enabler_match_event_notifier( | |
1035 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
d7d45c0d | 1036 | struct lttng_ust_event_notifier *event_notifier) |
d8d2416d | 1037 | { |
115db533 | 1038 | int desc_matches = lttng_desc_match_enabler(event_notifier->priv->parent.desc, |
d8d2416d FD |
1039 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
1040 | ||
115db533 MD |
1041 | if (desc_matches && event_notifier->priv->group == event_notifier_enabler->group && |
1042 | event_notifier->priv->parent.user_token == event_notifier_enabler->user_token) | |
d8d2416d FD |
1043 | return 1; |
1044 | else | |
1045 | return 0; | |
1046 | } | |
1047 | ||
e58095ef | 1048 | static |
d871c65b FD |
1049 | struct lttng_enabler_ref *lttng_enabler_ref( |
1050 | struct cds_list_head *enabler_ref_list, | |
e58095ef MD |
1051 | struct lttng_enabler *enabler) |
1052 | { | |
1053 | struct lttng_enabler_ref *enabler_ref; | |
1054 | ||
d871c65b | 1055 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
e58095ef MD |
1056 | if (enabler_ref->ref == enabler) |
1057 | return enabler_ref; | |
1058 | } | |
1059 | return NULL; | |
1060 | } | |
1061 | ||
8020ceb5 | 1062 | /* |
e58095ef MD |
1063 | * Create struct lttng_event if it is missing and present in the list of |
1064 | * tracepoint probes. | |
8020ceb5 | 1065 | */ |
e58095ef | 1066 | static |
d871c65b | 1067 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1068 | { |
d871c65b | 1069 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1070 | struct lttng_probe_desc *probe_desc; |
1071 | const struct lttng_event_desc *desc; | |
2e70391c | 1072 | struct lttng_ust_event_recorder_private *event_recorder_priv; |
e58095ef MD |
1073 | int i; |
1074 | struct cds_list_head *probe_list; | |
1075 | ||
1076 | probe_list = lttng_get_probe_list_head(); | |
1077 | /* | |
1078 | * For each probe event, if we find that a probe event matches | |
1079 | * our enabler, create an associated lttng_event if not | |
1080 | * already present. | |
1081 | */ | |
1082 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1083 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
1084 | int ret; |
1085 | bool found = false; | |
d56fa719 MD |
1086 | struct cds_hlist_head *head; |
1087 | struct cds_hlist_node *node; | |
e58095ef MD |
1088 | |
1089 | desc = probe_desc->event_desc[i]; | |
d871c65b FD |
1090 | if (!lttng_desc_match_enabler(desc, |
1091 | lttng_event_enabler_as_enabler(event_enabler))) | |
e58095ef MD |
1092 | continue; |
1093 | ||
fb470188 | 1094 | head = borrow_hash_table_bucket( |
bdb12629 | 1095 | session->priv->events_ht.table, |
fb470188 FD |
1096 | LTTNG_UST_EVENT_HT_SIZE, desc); |
1097 | ||
2e70391c MD |
1098 | cds_hlist_for_each_entry(event_recorder_priv, node, head, hlist) { |
1099 | if (event_recorder_priv->parent.desc == desc | |
1100 | && event_recorder_priv->pub->chan == event_enabler->chan) { | |
98a97f24 | 1101 | found = true; |
3140bffe FD |
1102 | break; |
1103 | } | |
e58095ef MD |
1104 | } |
1105 | if (found) | |
1106 | continue; | |
1107 | ||
1108 | /* | |
1109 | * We need to create an event for this | |
1110 | * event probe. | |
1111 | */ | |
2e70391c | 1112 | ret = lttng_event_recorder_create(probe_desc->event_desc[i], |
d871c65b | 1113 | event_enabler->chan); |
e58095ef | 1114 | if (ret) { |
32ce8569 MD |
1115 | DBG("Unable to create event %s, error %d\n", |
1116 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 1117 | } |
8165c8da | 1118 | } |
8020ceb5 | 1119 | } |
8020ceb5 MD |
1120 | } |
1121 | ||
a44d07da FD |
1122 | static |
1123 | void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc, | |
d8d2416d | 1124 | void (*event_func)(struct lttng_session *session, |
2e70391c | 1125 | struct lttng_ust_event_recorder *event_recorder), |
d7d45c0d | 1126 | void (*event_notifier_func)(struct lttng_ust_event_notifier *event_notifier)) |
35ac38cb FD |
1127 | { |
1128 | struct cds_hlist_node *node, *tmp_node; | |
1129 | struct cds_list_head *sessionsp; | |
a44d07da | 1130 | unsigned int i; |
35ac38cb FD |
1131 | |
1132 | /* Get handle on list of sessions. */ | |
7753d283 | 1133 | sessionsp = lttng_get_sessions(); |
35ac38cb FD |
1134 | |
1135 | /* | |
a44d07da FD |
1136 | * Iterate over all events in the probe provider descriptions and |
1137 | * sessions to queue the unregistration of the events. | |
35ac38cb FD |
1138 | */ |
1139 | for (i = 0; i < provider_desc->nr_events; i++) { | |
1140 | const struct lttng_event_desc *event_desc; | |
d8d2416d | 1141 | struct lttng_event_notifier_group *event_notifier_group; |
115db533 | 1142 | struct lttng_ust_event_notifier_private *event_notifier_priv; |
bdb12629 | 1143 | struct lttng_ust_session_private *session_priv; |
a44d07da | 1144 | struct cds_hlist_head *head; |
2e70391c | 1145 | struct lttng_ust_event_recorder_private *event_recorder_priv; |
35ac38cb FD |
1146 | |
1147 | event_desc = provider_desc->event_desc[i]; | |
35ac38cb | 1148 | |
a44d07da FD |
1149 | /* |
1150 | * Iterate over all session to find the current event | |
1151 | * description. | |
1152 | */ | |
bdb12629 | 1153 | cds_list_for_each_entry(session_priv, sessionsp, node) { |
35ac38cb | 1154 | /* |
a44d07da FD |
1155 | * Get the list of events in the hashtable bucket and |
1156 | * iterate to find the event matching this descriptor. | |
35ac38cb | 1157 | */ |
fb470188 | 1158 | head = borrow_hash_table_bucket( |
bdb12629 | 1159 | session_priv->events_ht.table, |
fb470188 FD |
1160 | LTTNG_UST_EVENT_HT_SIZE, event_desc); |
1161 | ||
2e70391c MD |
1162 | cds_hlist_for_each_entry_safe(event_recorder_priv, node, tmp_node, head, hlist) { |
1163 | if (event_desc == event_recorder_priv->parent.desc) { | |
1164 | event_func(session_priv->pub, event_recorder_priv->pub); | |
35ac38cb FD |
1165 | break; |
1166 | } | |
1167 | } | |
1168 | } | |
d8d2416d FD |
1169 | |
1170 | /* | |
1171 | * Iterate over all event_notifier groups to find the current event | |
1172 | * description. | |
1173 | */ | |
1174 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1175 | /* | |
1176 | * Get the list of event_notifiers in the hashtable bucket and | |
1177 | * iterate to find the event_notifier matching this | |
1178 | * descriptor. | |
1179 | */ | |
1180 | head = borrow_hash_table_bucket( | |
1181 | event_notifier_group->event_notifiers_ht.table, | |
1182 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, event_desc); | |
1183 | ||
115db533 MD |
1184 | cds_hlist_for_each_entry_safe(event_notifier_priv, node, tmp_node, head, hlist) { |
1185 | if (event_desc == event_notifier_priv->parent.desc) { | |
1186 | event_notifier_func(event_notifier_priv->pub); | |
d8d2416d FD |
1187 | break; |
1188 | } | |
1189 | } | |
1190 | } | |
35ac38cb | 1191 | } |
a44d07da FD |
1192 | } |
1193 | ||
1194 | static | |
2e70391c MD |
1195 | void _unregister_event_recorder(struct lttng_session *session, |
1196 | struct lttng_ust_event_recorder *event_recorder) | |
a44d07da | 1197 | { |
2e70391c | 1198 | _lttng_event_recorder_unregister(event_recorder); |
a44d07da FD |
1199 | } |
1200 | ||
1201 | static | |
1202 | void _event_enum_destroy(struct lttng_session *session, | |
2e70391c | 1203 | struct lttng_ust_event_recorder *event_recorder) |
a44d07da FD |
1204 | { |
1205 | unsigned int i; | |
1206 | ||
1207 | /* Destroy enums of the current event. */ | |
2e70391c | 1208 | for (i = 0; i < event_recorder->parent->priv->desc->nr_fields; i++) { |
a44d07da FD |
1209 | const struct lttng_enum_desc *enum_desc; |
1210 | const struct lttng_event_field *field; | |
1211 | struct lttng_enum *curr_enum; | |
1212 | ||
2e70391c | 1213 | field = &(event_recorder->parent->priv->desc->fields[i]); |
a44d07da | 1214 | switch (field->type.atype) { |
a44d07da FD |
1215 | case atype_enum_nestable: |
1216 | enum_desc = field->type.u.enum_nestable.desc; | |
1217 | break; | |
1218 | default: | |
1219 | continue; | |
1220 | } | |
1221 | ||
1222 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); | |
1223 | if (curr_enum) { | |
1224 | _lttng_enum_destroy(curr_enum); | |
1225 | } | |
1226 | } | |
1227 | ||
1228 | /* Destroy event. */ | |
2e70391c | 1229 | _lttng_event_recorder_destroy(event_recorder); |
a44d07da FD |
1230 | } |
1231 | ||
1232 | /* | |
1233 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
1234 | * the probe provider descriptor received as argument. Must me called with the | |
1235 | * ust_lock held. | |
1236 | */ | |
1237 | void lttng_probe_provider_unregister_events( | |
1238 | struct lttng_probe_desc *provider_desc) | |
1239 | { | |
1240 | /* | |
1241 | * Iterate over all events in the probe provider descriptions and sessions | |
1242 | * to queue the unregistration of the events. | |
1243 | */ | |
2e70391c | 1244 | probe_provider_event_for_each(provider_desc, _unregister_event_recorder, |
d8d2416d | 1245 | _lttng_event_notifier_unregister); |
35ac38cb FD |
1246 | |
1247 | /* Wait for grace period. */ | |
b653ddc1 | 1248 | lttng_ust_urcu_synchronize_rcu(); |
35ac38cb FD |
1249 | /* Prune the unregistration queue. */ |
1250 | __tracepoint_probe_prune_release_queue(); | |
1251 | ||
1252 | /* | |
1253 | * It is now safe to destroy the events and remove them from the event list | |
1254 | * and hashtables. | |
1255 | */ | |
d8d2416d FD |
1256 | probe_provider_event_for_each(provider_desc, _event_enum_destroy, |
1257 | _lttng_event_notifier_destroy); | |
35ac38cb FD |
1258 | } |
1259 | ||
8020ceb5 | 1260 | /* |
d8d2416d | 1261 | * Create events associated with an event enabler (if not already present), |
e58095ef | 1262 | * and add backward reference from the event to the enabler. |
8020ceb5 MD |
1263 | */ |
1264 | static | |
d871c65b | 1265 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1266 | { |
d871c65b | 1267 | struct lttng_session *session = event_enabler->chan->session; |
2e70391c | 1268 | struct lttng_ust_event_recorder_private *event_recorder_priv; |
e58095ef | 1269 | |
d871c65b | 1270 | if (!lttng_event_enabler_as_enabler(event_enabler)->enabled) |
de713d8a FD |
1271 | goto end; |
1272 | ||
e58095ef | 1273 | /* First ensure that probe events are created for this enabler. */ |
d871c65b | 1274 | lttng_create_event_if_missing(event_enabler); |
e58095ef MD |
1275 | |
1276 | /* For each event matching enabler in session event list. */ | |
2e70391c | 1277 | cds_list_for_each_entry(event_recorder_priv, &session->priv->events_head, node) { |
e58095ef MD |
1278 | struct lttng_enabler_ref *enabler_ref; |
1279 | ||
2e70391c | 1280 | if (!lttng_event_enabler_match_event(event_enabler, event_recorder_priv->pub)) |
e58095ef MD |
1281 | continue; |
1282 | ||
2e70391c | 1283 | enabler_ref = lttng_enabler_ref(&event_recorder_priv->parent.enablers_ref_head, |
d871c65b | 1284 | lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef MD |
1285 | if (!enabler_ref) { |
1286 | /* | |
1287 | * If no backward ref, create it. | |
1288 | * Add backward ref from event to enabler. | |
1289 | */ | |
1290 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1291 | if (!enabler_ref) | |
1292 | return -ENOMEM; | |
d871c65b FD |
1293 | enabler_ref->ref = lttng_event_enabler_as_enabler( |
1294 | event_enabler); | |
e58095ef | 1295 | cds_list_add(&enabler_ref->node, |
2e70391c | 1296 | &event_recorder_priv->parent.enablers_ref_head); |
8165c8da | 1297 | } |
e58095ef MD |
1298 | |
1299 | /* | |
1300 | * Link filter bytecodes if not linked yet. | |
1301 | */ | |
2e70391c | 1302 | lttng_enabler_link_bytecode(event_recorder_priv->parent.desc, |
bdb12629 | 1303 | &session->priv->ctx, |
2e70391c | 1304 | &event_recorder_priv->pub->parent->filter_bytecode_runtime_head, |
621c07fc | 1305 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
e58095ef MD |
1306 | |
1307 | /* TODO: merge event context. */ | |
1308 | } | |
de713d8a | 1309 | end: |
e58095ef MD |
1310 | return 0; |
1311 | } | |
1312 | ||
1313 | /* | |
1314 | * Called at library load: connect the probe on all enablers matching | |
1315 | * this event. | |
5f733922 | 1316 | * Called with session mutex held. |
e58095ef | 1317 | */ |
5f733922 | 1318 | int lttng_fix_pending_events(void) |
e58095ef | 1319 | { |
bdb12629 | 1320 | struct lttng_ust_session_private *session_priv; |
e58095ef | 1321 | |
bdb12629 MD |
1322 | cds_list_for_each_entry(session_priv, &sessions, node) { |
1323 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
8020ceb5 | 1324 | } |
e58095ef MD |
1325 | return 0; |
1326 | } | |
1327 | ||
d8d2416d FD |
1328 | int lttng_fix_pending_event_notifiers(void) |
1329 | { | |
1330 | struct lttng_event_notifier_group *event_notifier_group; | |
1331 | ||
1332 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1333 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1334 | } | |
1335 | return 0; | |
1336 | } | |
1337 | ||
246be17e | 1338 | /* |
37dddb65 MD |
1339 | * For each session of the owner thread, execute pending statedump. |
1340 | * Only dump state for the sessions owned by the caller thread, because | |
1341 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 1342 | */ |
3327ac33 | 1343 | void lttng_handle_pending_statedump(void *owner) |
246be17e | 1344 | { |
bdb12629 | 1345 | struct lttng_ust_session_private *session_priv; |
246be17e | 1346 | |
37dddb65 | 1347 | /* Execute state dump */ |
cf73e0fe | 1348 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
1349 | |
1350 | /* Clear pending state dump */ | |
3327ac33 MD |
1351 | if (ust_lock()) { |
1352 | goto end; | |
1353 | } | |
bdb12629 MD |
1354 | cds_list_for_each_entry(session_priv, &sessions, node) { |
1355 | if (session_priv->owner != owner) | |
37dddb65 | 1356 | continue; |
bdb12629 | 1357 | if (!session_priv->statedump_pending) |
37dddb65 | 1358 | continue; |
bdb12629 | 1359 | session_priv->statedump_pending = 0; |
246be17e | 1360 | } |
3327ac33 | 1361 | end: |
37dddb65 | 1362 | ust_unlock(); |
3327ac33 | 1363 | return; |
246be17e PW |
1364 | } |
1365 | ||
e58095ef MD |
1366 | /* |
1367 | * Only used internally at session destruction. | |
1368 | */ | |
1369 | static | |
2e70391c | 1370 | void _lttng_event_recorder_destroy(struct lttng_ust_event_recorder *event_recorder) |
e58095ef MD |
1371 | { |
1372 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1373 | ||
35ac38cb | 1374 | /* Remove from event list. */ |
2e70391c | 1375 | cds_list_del(&event_recorder->priv->node); |
35ac38cb | 1376 | /* Remove from event hash table. */ |
2e70391c | 1377 | cds_hlist_del(&event_recorder->priv->hlist); |
35ac38cb | 1378 | |
2e70391c | 1379 | lttng_destroy_context(event_recorder->ctx); |
b1f720f0 | 1380 | lttng_free_event_filter_runtime(event_recorder->parent); |
e58095ef MD |
1381 | /* Free event enabler refs */ |
1382 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
2e70391c | 1383 | &event_recorder->parent->priv->enablers_ref_head, node) |
e58095ef | 1384 | free(enabler_ref); |
2e70391c MD |
1385 | free(event_recorder->priv); |
1386 | free(event_recorder->parent); | |
1387 | free(event_recorder); | |
8020ceb5 MD |
1388 | } |
1389 | ||
c785c634 MD |
1390 | static |
1391 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1392 | { | |
1393 | cds_list_del(&_enum->node); | |
35ac38cb | 1394 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1395 | free(_enum); |
1396 | } | |
1397 | ||
fd17d7ce | 1398 | void lttng_ust_abi_events_exit(void) |
8020ceb5 | 1399 | { |
bdb12629 | 1400 | struct lttng_ust_session_private *session_priv, *tmpsession_priv; |
8020ceb5 | 1401 | |
bdb12629 MD |
1402 | cds_list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, node) |
1403 | lttng_session_destroy(session_priv->pub); | |
8020ceb5 | 1404 | } |
457a6b58 | 1405 | |
e58095ef MD |
1406 | /* |
1407 | * Enabler management. | |
1408 | */ | |
d871c65b FD |
1409 | struct lttng_event_enabler *lttng_event_enabler_create( |
1410 | enum lttng_enabler_format_type format_type, | |
fd17d7ce | 1411 | struct lttng_ust_abi_event *event_param, |
e58095ef | 1412 | struct lttng_channel *chan) |
457a6b58 | 1413 | { |
d871c65b | 1414 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1415 | |
d871c65b FD |
1416 | event_enabler = zmalloc(sizeof(*event_enabler)); |
1417 | if (!event_enabler) | |
e58095ef | 1418 | return NULL; |
d871c65b FD |
1419 | event_enabler->base.format_type = format_type; |
1420 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1421 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); | |
1422 | memcpy(&event_enabler->base.event_param, event_param, | |
1423 | sizeof(event_enabler->base.event_param)); | |
1424 | event_enabler->chan = chan; | |
e58095ef | 1425 | /* ctx left NULL */ |
d871c65b | 1426 | event_enabler->base.enabled = 0; |
bdb12629 | 1427 | cds_list_add(&event_enabler->node, &event_enabler->chan->session->priv->enablers_head); |
d871c65b FD |
1428 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); |
1429 | ||
1430 | return event_enabler; | |
457a6b58 MD |
1431 | } |
1432 | ||
d8d2416d FD |
1433 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
1434 | struct lttng_event_notifier_group *event_notifier_group, | |
1435 | enum lttng_enabler_format_type format_type, | |
fd17d7ce | 1436 | struct lttng_ust_abi_event_notifier *event_notifier_param) |
d8d2416d FD |
1437 | { |
1438 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1439 | ||
1440 | event_notifier_enabler = zmalloc(sizeof(*event_notifier_enabler)); | |
1441 | if (!event_notifier_enabler) | |
1442 | return NULL; | |
1443 | event_notifier_enabler->base.format_type = format_type; | |
1444 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
d37ecb3f | 1445 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
d8d2416d FD |
1446 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.excluder_head); |
1447 | ||
1448 | event_notifier_enabler->user_token = event_notifier_param->event.token; | |
9560f5eb | 1449 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
d37ecb3f | 1450 | event_notifier_enabler->num_captures = 0; |
d8d2416d FD |
1451 | |
1452 | memcpy(&event_notifier_enabler->base.event_param.name, | |
1453 | event_notifier_param->event.name, | |
1454 | sizeof(event_notifier_enabler->base.event_param.name)); | |
1455 | event_notifier_enabler->base.event_param.instrumentation = | |
1456 | event_notifier_param->event.instrumentation; | |
1457 | event_notifier_enabler->base.event_param.loglevel = | |
1458 | event_notifier_param->event.loglevel; | |
1459 | event_notifier_enabler->base.event_param.loglevel_type = | |
1460 | event_notifier_param->event.loglevel_type; | |
1461 | ||
1462 | event_notifier_enabler->base.enabled = 0; | |
1463 | event_notifier_enabler->group = event_notifier_group; | |
1464 | ||
1465 | cds_list_add(&event_notifier_enabler->node, | |
1466 | &event_notifier_group->enablers_head); | |
1467 | ||
1468 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1469 | ||
1470 | return event_notifier_enabler; | |
1471 | } | |
1472 | ||
d871c65b | 1473 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1474 | { |
d871c65b FD |
1475 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
1476 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1477 | ||
e58095ef | 1478 | return 0; |
457a6b58 | 1479 | } |
457a6b58 | 1480 | |
d871c65b | 1481 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1482 | { |
d871c65b FD |
1483 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1484 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1485 | ||
e58095ef MD |
1486 | return 0; |
1487 | } | |
457a6b58 | 1488 | |
d871c65b | 1489 | static |
a56fd376 | 1490 | void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
ab89263e | 1491 | struct lttng_ust_bytecode_node **bytecode) |
e58095ef | 1492 | { |
ab89263e MD |
1493 | (*bytecode)->enabler = enabler; |
1494 | cds_list_add_tail(&(*bytecode)->node, &enabler->filter_bytecode_head); | |
1495 | /* Take ownership of bytecode */ | |
1496 | *bytecode = NULL; | |
d871c65b FD |
1497 | } |
1498 | ||
a56fd376 | 1499 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
ab89263e | 1500 | struct lttng_ust_bytecode_node **bytecode) |
d871c65b | 1501 | { |
a56fd376 | 1502 | _lttng_enabler_attach_filter_bytecode( |
d871c65b FD |
1503 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
1504 | ||
1505 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
e58095ef | 1506 | return 0; |
0bfb5cbd JI |
1507 | } |
1508 | ||
d871c65b FD |
1509 | static |
1510 | void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
e9fe6aad | 1511 | struct lttng_ust_excluder_node **excluder) |
0bfb5cbd | 1512 | { |
e9fe6aad MD |
1513 | (*excluder)->enabler = enabler; |
1514 | cds_list_add_tail(&(*excluder)->node, &enabler->excluder_head); | |
1515 | /* Take ownership of excluder */ | |
1516 | *excluder = NULL; | |
d871c65b FD |
1517 | } |
1518 | ||
1519 | int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler, | |
e9fe6aad | 1520 | struct lttng_ust_excluder_node **excluder) |
d871c65b FD |
1521 | { |
1522 | _lttng_enabler_attach_exclusion( | |
1523 | lttng_event_enabler_as_enabler(event_enabler), excluder); | |
1524 | ||
1525 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
0bfb5cbd | 1526 | return 0; |
e58095ef | 1527 | } |
f488575f | 1528 | |
d8d2416d FD |
1529 | int lttng_event_notifier_enabler_enable( |
1530 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1531 | { | |
1532 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
1533 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1534 | ||
1535 | return 0; | |
1536 | } | |
1537 | ||
1538 | int lttng_event_notifier_enabler_disable( | |
1539 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1540 | { | |
1541 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
1542 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1543 | ||
1544 | return 0; | |
1545 | } | |
1546 | ||
a56fd376 | 1547 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
d8d2416d | 1548 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
ab89263e | 1549 | struct lttng_ust_bytecode_node **bytecode) |
d8d2416d | 1550 | { |
a56fd376 | 1551 | _lttng_enabler_attach_filter_bytecode( |
d8d2416d FD |
1552 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
1553 | bytecode); | |
1554 | ||
1555 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1556 | return 0; | |
1557 | } | |
1558 | ||
d37ecb3f FD |
1559 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
1560 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
49cde654 | 1561 | struct lttng_ust_bytecode_node **bytecode) |
d37ecb3f | 1562 | { |
49cde654 | 1563 | (*bytecode)->enabler = lttng_event_notifier_enabler_as_enabler( |
d37ecb3f | 1564 | event_notifier_enabler); |
49cde654 | 1565 | cds_list_add_tail(&(*bytecode)->node, |
d37ecb3f | 1566 | &event_notifier_enabler->capture_bytecode_head); |
49cde654 MD |
1567 | /* Take ownership of bytecode */ |
1568 | *bytecode = NULL; | |
d37ecb3f FD |
1569 | event_notifier_enabler->num_captures++; |
1570 | ||
1571 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1572 | return 0; | |
1573 | } | |
1574 | ||
d8d2416d FD |
1575 | int lttng_event_notifier_enabler_attach_exclusion( |
1576 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
e9fe6aad | 1577 | struct lttng_ust_excluder_node **excluder) |
d8d2416d FD |
1578 | { |
1579 | _lttng_enabler_attach_exclusion( | |
1580 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), | |
1581 | excluder); | |
1582 | ||
1583 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1584 | return 0; | |
1585 | } | |
1586 | ||
fd17d7ce MD |
1587 | int lttng_attach_context(struct lttng_ust_abi_context *context_param, |
1588 | union lttng_ust_abi_args *uargs, | |
e58095ef MD |
1589 | struct lttng_ctx **ctx, struct lttng_session *session) |
1590 | { | |
457a6b58 | 1591 | /* |
e58095ef MD |
1592 | * We cannot attach a context after trace has been started for a |
1593 | * session because the metadata does not allow expressing this | |
1594 | * information outside of the original channel scope. | |
457a6b58 | 1595 | */ |
bdb12629 | 1596 | if (session->priv->been_active) |
e58095ef | 1597 | return -EPERM; |
457a6b58 | 1598 | |
e58095ef | 1599 | switch (context_param->ctx) { |
fd17d7ce | 1600 | case LTTNG_UST_ABI_CONTEXT_PTHREAD_ID: |
e58095ef | 1601 | return lttng_add_pthread_id_to_ctx(ctx); |
fd17d7ce | 1602 | case LTTNG_UST_ABI_CONTEXT_PERF_THREAD_COUNTER: |
d58d1454 | 1603 | { |
fd17d7ce | 1604 | struct lttng_ust_abi_perf_counter_ctx *perf_ctx_param; |
d58d1454 MD |
1605 | |
1606 | perf_ctx_param = &context_param->u.perf_counter; | |
1607 | return lttng_add_perf_counter_to_ctx( | |
1608 | perf_ctx_param->type, | |
1609 | perf_ctx_param->config, | |
1610 | perf_ctx_param->name, | |
1611 | ctx); | |
1612 | } | |
fd17d7ce | 1613 | case LTTNG_UST_ABI_CONTEXT_VTID: |
e58095ef | 1614 | return lttng_add_vtid_to_ctx(ctx); |
fd17d7ce | 1615 | case LTTNG_UST_ABI_CONTEXT_VPID: |
e58095ef | 1616 | return lttng_add_vpid_to_ctx(ctx); |
fd17d7ce | 1617 | case LTTNG_UST_ABI_CONTEXT_PROCNAME: |
e58095ef | 1618 | return lttng_add_procname_to_ctx(ctx); |
fd17d7ce | 1619 | case LTTNG_UST_ABI_CONTEXT_IP: |
96f85541 | 1620 | return lttng_add_ip_to_ctx(ctx); |
fd17d7ce | 1621 | case LTTNG_UST_ABI_CONTEXT_CPU_ID: |
c7ea8487 | 1622 | return lttng_add_cpu_id_to_ctx(ctx); |
fd17d7ce | 1623 | case LTTNG_UST_ABI_CONTEXT_APP_CONTEXT: |
8e696cfa MD |
1624 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, |
1625 | ctx); | |
fd17d7ce | 1626 | case LTTNG_UST_ABI_CONTEXT_CGROUP_NS: |
735bef47 | 1627 | return lttng_add_cgroup_ns_to_ctx(ctx); |
fd17d7ce | 1628 | case LTTNG_UST_ABI_CONTEXT_IPC_NS: |
735bef47 | 1629 | return lttng_add_ipc_ns_to_ctx(ctx); |
fd17d7ce | 1630 | case LTTNG_UST_ABI_CONTEXT_MNT_NS: |
735bef47 | 1631 | return lttng_add_mnt_ns_to_ctx(ctx); |
fd17d7ce | 1632 | case LTTNG_UST_ABI_CONTEXT_NET_NS: |
735bef47 | 1633 | return lttng_add_net_ns_to_ctx(ctx); |
fd17d7ce | 1634 | case LTTNG_UST_ABI_CONTEXT_PID_NS: |
735bef47 | 1635 | return lttng_add_pid_ns_to_ctx(ctx); |
fd17d7ce | 1636 | case LTTNG_UST_ABI_CONTEXT_TIME_NS: |
cefef7a7 | 1637 | return lttng_add_time_ns_to_ctx(ctx); |
fd17d7ce | 1638 | case LTTNG_UST_ABI_CONTEXT_USER_NS: |
735bef47 | 1639 | return lttng_add_user_ns_to_ctx(ctx); |
fd17d7ce | 1640 | case LTTNG_UST_ABI_CONTEXT_UTS_NS: |
735bef47 | 1641 | return lttng_add_uts_ns_to_ctx(ctx); |
fd17d7ce | 1642 | case LTTNG_UST_ABI_CONTEXT_VUID: |
fca2f191 | 1643 | return lttng_add_vuid_to_ctx(ctx); |
fd17d7ce | 1644 | case LTTNG_UST_ABI_CONTEXT_VEUID: |
fca2f191 | 1645 | return lttng_add_veuid_to_ctx(ctx); |
fd17d7ce | 1646 | case LTTNG_UST_ABI_CONTEXT_VSUID: |
fca2f191 | 1647 | return lttng_add_vsuid_to_ctx(ctx); |
fd17d7ce | 1648 | case LTTNG_UST_ABI_CONTEXT_VGID: |
fca2f191 | 1649 | return lttng_add_vgid_to_ctx(ctx); |
fd17d7ce | 1650 | case LTTNG_UST_ABI_CONTEXT_VEGID: |
fca2f191 | 1651 | return lttng_add_vegid_to_ctx(ctx); |
fd17d7ce | 1652 | case LTTNG_UST_ABI_CONTEXT_VSGID: |
fca2f191 | 1653 | return lttng_add_vsgid_to_ctx(ctx); |
e58095ef MD |
1654 | default: |
1655 | return -EINVAL; | |
457a6b58 | 1656 | } |
457a6b58 MD |
1657 | } |
1658 | ||
d871c65b | 1659 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
fd17d7ce | 1660 | struct lttng_ust_abi_context *context_param) |
457a6b58 | 1661 | { |
e58095ef | 1662 | return -ENOSYS; |
457a6b58 MD |
1663 | } |
1664 | ||
d871c65b | 1665 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1666 | { |
d871c65b FD |
1667 | if (!event_enabler) { |
1668 | return; | |
0f63324a | 1669 | } |
d871c65b | 1670 | cds_list_del(&event_enabler->node); |
0f63324a | 1671 | |
d871c65b | 1672 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef | 1673 | |
d871c65b FD |
1674 | lttng_destroy_context(event_enabler->ctx); |
1675 | free(event_enabler); | |
457a6b58 MD |
1676 | } |
1677 | ||
e58095ef | 1678 | /* |
d871c65b | 1679 | * lttng_session_sync_event_enablers should be called just before starting a |
e58095ef MD |
1680 | * session. |
1681 | */ | |
457a6b58 | 1682 | static |
d871c65b | 1683 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1684 | { |
d871c65b | 1685 | struct lttng_event_enabler *event_enabler; |
2e70391c | 1686 | struct lttng_ust_event_recorder_private *event_recorder_priv; |
457a6b58 | 1687 | |
bdb12629 | 1688 | cds_list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
d871c65b | 1689 | lttng_event_enabler_ref_events(event_enabler); |
e58095ef MD |
1690 | /* |
1691 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1692 | * and its channel and session transient states are enabled, we |
1693 | * enable the event, else we disable it. | |
e58095ef | 1694 | */ |
2e70391c | 1695 | cds_list_for_each_entry(event_recorder_priv, &session->priv->events_head, node) { |
e58095ef MD |
1696 | struct lttng_enabler_ref *enabler_ref; |
1697 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1698 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1699 | |
1700 | /* Enable events */ | |
1701 | cds_list_for_each_entry(enabler_ref, | |
2e70391c | 1702 | &event_recorder_priv->parent.enablers_ref_head, node) { |
e58095ef MD |
1703 | if (enabler_ref->ref->enabled) { |
1704 | enabled = 1; | |
1705 | break; | |
1706 | } | |
1707 | } | |
ac6b4ac6 MD |
1708 | /* |
1709 | * Enabled state is based on union of enablers, with | |
1710 | * intesection of session and channel transient enable | |
1711 | * states. | |
1712 | */ | |
2e70391c | 1713 | enabled = enabled && session->priv->tstate && event_recorder_priv->pub->chan->tstate; |
ac6b4ac6 | 1714 | |
2e70391c | 1715 | CMM_STORE_SHARED(event_recorder_priv->pub->parent->enabled, enabled); |
ac6b4ac6 MD |
1716 | /* |
1717 | * Sync tracepoint registration with event enabled | |
1718 | * state. | |
1719 | */ | |
1720 | if (enabled) { | |
2e70391c MD |
1721 | if (!event_recorder_priv->parent.registered) |
1722 | register_event_recorder(event_recorder_priv->pub); | |
ac6b4ac6 | 1723 | } else { |
2e70391c MD |
1724 | if (event_recorder_priv->parent.registered) |
1725 | unregister_event_recorder(event_recorder_priv->pub); | |
ac6b4ac6 | 1726 | } |
457a6b58 | 1727 | |
1f49fc05 | 1728 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 | 1729 | cds_list_for_each_entry(enabler_ref, |
2e70391c | 1730 | &event_recorder_priv->parent.enablers_ref_head, node) { |
1f49fc05 MD |
1731 | if (enabler_ref->ref->enabled |
1732 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1733 | has_enablers_without_bytecode = 1; |
1734 | break; | |
1735 | } | |
1736 | } | |
2e70391c | 1737 | event_recorder_priv->pub->parent->has_enablers_without_bytecode = |
dcdeaff0 MD |
1738 | has_enablers_without_bytecode; |
1739 | ||
e58095ef MD |
1740 | /* Enable filters */ |
1741 | cds_list_for_each_entry(runtime, | |
2e70391c | 1742 | &event_recorder_priv->pub->parent->filter_bytecode_runtime_head, node) { |
4d451c15 | 1743 | lttng_bytecode_filter_sync_state(runtime); |
457a6b58 MD |
1744 | } |
1745 | } | |
baa1e0bc | 1746 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1747 | } |
1748 | ||
4296085e MD |
1749 | /* Support for event notifier is introduced by probe provider major version 2. */ |
1750 | static | |
1751 | bool lttng_ust_probe_supports_event_notifier(struct lttng_probe_desc *probe_desc) | |
1752 | { | |
1753 | return probe_desc->major >= 2; | |
1754 | } | |
1755 | ||
d8d2416d FD |
1756 | static |
1757 | void lttng_create_event_notifier_if_missing( | |
1758 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1759 | { | |
1760 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1761 | struct lttng_probe_desc *probe_desc; | |
1762 | struct cds_list_head *probe_list; | |
1763 | int i; | |
1764 | ||
1765 | probe_list = lttng_get_probe_list_head(); | |
1766 | ||
1767 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1768 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1769 | int ret; | |
1770 | bool found = false; | |
1771 | const struct lttng_event_desc *desc; | |
115db533 | 1772 | struct lttng_ust_event_notifier_private *event_notifier_priv; |
d8d2416d FD |
1773 | struct cds_hlist_head *head; |
1774 | struct cds_hlist_node *node; | |
1775 | ||
1776 | desc = probe_desc->event_desc[i]; | |
d37ecb3f | 1777 | |
d8d2416d FD |
1778 | if (!lttng_desc_match_enabler(desc, |
1779 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1780 | continue; | |
1781 | ||
1782 | /* | |
1783 | * Given the current event_notifier group, get the bucket that | |
1784 | * the target event_notifier would be if it was already | |
1785 | * created. | |
1786 | */ | |
1787 | head = borrow_hash_table_bucket( | |
1788 | event_notifier_group->event_notifiers_ht.table, | |
1789 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
1790 | ||
115db533 | 1791 | cds_hlist_for_each_entry(event_notifier_priv, node, head, hlist) { |
d8d2416d FD |
1792 | /* |
1793 | * Check if event_notifier already exists by checking | |
1794 | * if the event_notifier and enabler share the same | |
1795 | * description and id. | |
1796 | */ | |
115db533 MD |
1797 | if (event_notifier_priv->parent.desc == desc && |
1798 | event_notifier_priv->parent.user_token == event_notifier_enabler->user_token) { | |
d8d2416d FD |
1799 | found = true; |
1800 | break; | |
1801 | } | |
1802 | } | |
1803 | ||
1804 | if (found) | |
1805 | continue; | |
1806 | ||
4296085e MD |
1807 | /* Check that the probe supports event notifiers, else report the error. */ |
1808 | if (!lttng_ust_probe_supports_event_notifier(probe_desc)) { | |
1809 | ERR("Probe \"%s\" contains event \"%s\" which matches an enabled event notifier, " | |
1810 | "but its version (%u.%u) is too old and does not implement event notifiers. " | |
1811 | "It needs to be recompiled against a newer version of LTTng-UST, otherwise " | |
1812 | "this event will not generate any notification.", | |
1813 | probe_desc->provider, | |
1814 | desc->name, | |
1815 | probe_desc->major, | |
1816 | probe_desc->minor); | |
1817 | continue; | |
1818 | } | |
d8d2416d FD |
1819 | /* |
1820 | * We need to create a event_notifier for this event probe. | |
1821 | */ | |
1822 | ret = lttng_event_notifier_create(desc, | |
1823 | event_notifier_enabler->user_token, | |
6566528b | 1824 | event_notifier_enabler->error_counter_index, |
d8d2416d FD |
1825 | event_notifier_group); |
1826 | if (ret) { | |
1827 | DBG("Unable to create event_notifier %s, error %d\n", | |
1828 | probe_desc->event_desc[i]->name, ret); | |
1829 | } | |
1830 | } | |
1831 | } | |
1832 | } | |
1833 | ||
1834 | /* | |
1835 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
1836 | */ | |
1837 | static | |
1838 | int lttng_event_notifier_enabler_ref_event_notifiers( | |
1839 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1840 | { | |
1841 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
115db533 | 1842 | struct lttng_ust_event_notifier_private *event_notifier_priv; |
d8d2416d FD |
1843 | |
1844 | /* | |
1845 | * Only try to create event_notifiers for enablers that are enabled, the user | |
1846 | * might still be attaching filter or exclusion to the | |
1847 | * event_notifier_enabler. | |
1848 | */ | |
1849 | if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled) | |
1850 | goto end; | |
1851 | ||
1852 | /* First, ensure that probe event_notifiers are created for this enabler. */ | |
1853 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
1854 | ||
1855 | /* Link the created event_notifier with its associated enabler. */ | |
115db533 | 1856 | cds_list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
d8d2416d FD |
1857 | struct lttng_enabler_ref *enabler_ref; |
1858 | ||
115db533 | 1859 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier_priv->pub)) |
d8d2416d FD |
1860 | continue; |
1861 | ||
115db533 | 1862 | enabler_ref = lttng_enabler_ref(&event_notifier_priv->parent.enablers_ref_head, |
d8d2416d FD |
1863 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); |
1864 | if (!enabler_ref) { | |
1865 | /* | |
1866 | * If no backward ref, create it. | |
1867 | * Add backward ref from event_notifier to enabler. | |
1868 | */ | |
1869 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1870 | if (!enabler_ref) | |
1871 | return -ENOMEM; | |
1872 | ||
1873 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
1874 | event_notifier_enabler); | |
1875 | cds_list_add(&enabler_ref->node, | |
115db533 | 1876 | &event_notifier_priv->parent.enablers_ref_head); |
d8d2416d FD |
1877 | } |
1878 | ||
1879 | /* | |
1880 | * Link filter bytecodes if not linked yet. | |
1881 | */ | |
115db533 | 1882 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
621c07fc | 1883 | &event_notifier_group->ctx, |
115db533 | 1884 | &event_notifier_priv->pub->parent->filter_bytecode_runtime_head, |
621c07fc | 1885 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); |
d37ecb3f FD |
1886 | |
1887 | /* | |
1888 | * Link capture bytecodes if not linked yet. | |
1889 | */ | |
115db533 MD |
1890 | lttng_enabler_link_bytecode(event_notifier_priv->parent.desc, |
1891 | &event_notifier_group->ctx, &event_notifier_priv->pub->capture_bytecode_runtime_head, | |
d37ecb3f FD |
1892 | &event_notifier_enabler->capture_bytecode_head); |
1893 | ||
115db533 | 1894 | event_notifier_priv->num_captures = event_notifier_enabler->num_captures; |
d8d2416d FD |
1895 | } |
1896 | end: | |
1897 | return 0; | |
1898 | } | |
1899 | ||
1900 | static | |
1901 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
1902 | { | |
1903 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
115db533 | 1904 | struct lttng_ust_event_notifier_private *event_notifier_priv; |
d8d2416d FD |
1905 | |
1906 | cds_list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
1907 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
1908 | ||
1909 | /* | |
1910 | * For each event_notifier, if at least one of its enablers is enabled, | |
1911 | * we enable the event_notifier, else we disable it. | |
1912 | */ | |
115db533 | 1913 | cds_list_for_each_entry(event_notifier_priv, &event_notifier_group->event_notifiers_head, node) { |
d8d2416d FD |
1914 | struct lttng_enabler_ref *enabler_ref; |
1915 | struct lttng_bytecode_runtime *runtime; | |
1916 | int enabled = 0, has_enablers_without_bytecode = 0; | |
1917 | ||
1918 | /* Enable event_notifiers */ | |
1919 | cds_list_for_each_entry(enabler_ref, | |
115db533 | 1920 | &event_notifier_priv->parent.enablers_ref_head, node) { |
d8d2416d FD |
1921 | if (enabler_ref->ref->enabled) { |
1922 | enabled = 1; | |
1923 | break; | |
1924 | } | |
1925 | } | |
1926 | ||
115db533 | 1927 | CMM_STORE_SHARED(event_notifier_priv->pub->parent->enabled, enabled); |
d8d2416d FD |
1928 | /* |
1929 | * Sync tracepoint registration with event_notifier enabled | |
1930 | * state. | |
1931 | */ | |
1932 | if (enabled) { | |
115db533 MD |
1933 | if (!event_notifier_priv->parent.registered) |
1934 | register_event_notifier(event_notifier_priv->pub); | |
d8d2416d | 1935 | } else { |
115db533 MD |
1936 | if (event_notifier_priv->parent.registered) |
1937 | unregister_event_notifier(event_notifier_priv->pub); | |
d8d2416d FD |
1938 | } |
1939 | ||
1940 | /* Check if has enablers without bytecode enabled */ | |
1941 | cds_list_for_each_entry(enabler_ref, | |
115db533 | 1942 | &event_notifier_priv->parent.enablers_ref_head, node) { |
d8d2416d FD |
1943 | if (enabler_ref->ref->enabled |
1944 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1945 | has_enablers_without_bytecode = 1; | |
1946 | break; | |
1947 | } | |
1948 | } | |
115db533 | 1949 | event_notifier_priv->pub->parent->has_enablers_without_bytecode = |
d8d2416d FD |
1950 | has_enablers_without_bytecode; |
1951 | ||
1952 | /* Enable filters */ | |
1953 | cds_list_for_each_entry(runtime, | |
115db533 | 1954 | &event_notifier_priv->pub->parent->filter_bytecode_runtime_head, node) { |
4d451c15 | 1955 | lttng_bytecode_filter_sync_state(runtime); |
d8d2416d | 1956 | } |
d37ecb3f FD |
1957 | |
1958 | /* Enable captures. */ | |
1959 | cds_list_for_each_entry(runtime, | |
115db533 | 1960 | &event_notifier_priv->pub->capture_bytecode_runtime_head, node) { |
d37ecb3f FD |
1961 | lttng_bytecode_capture_sync_state(runtime); |
1962 | } | |
d8d2416d FD |
1963 | } |
1964 | __tracepoint_probe_prune_release_queue(); | |
1965 | } | |
1966 | ||
e58095ef MD |
1967 | /* |
1968 | * Apply enablers to session events, adding events to session if need | |
1969 | * be. It is required after each modification applied to an active | |
1970 | * session, and right before session "start". | |
1971 | * "lazy" sync means we only sync if required. | |
1972 | */ | |
1973 | static | |
d871c65b | 1974 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1975 | { |
e58095ef MD |
1976 | /* We can skip if session is not active */ |
1977 | if (!session->active) | |
1978 | return; | |
d871c65b | 1979 | lttng_session_sync_event_enablers(session); |
457a6b58 | 1980 | } |
53569322 MD |
1981 | |
1982 | /* | |
1983 | * Update all sessions with the given app context. | |
1984 | * Called with ust lock held. | |
1985 | * This is invoked when an application context gets loaded/unloaded. It | |
1986 | * ensures the context callbacks are in sync with the application | |
1987 | * context (either app context callbacks, or dummy callbacks). | |
1988 | */ | |
1989 | void lttng_ust_context_set_session_provider(const char *name, | |
1990 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1991 | void (*record)(struct lttng_ctx_field *field, | |
1992 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1993 | struct lttng_channel *chan), | |
1994 | void (*get_value)(struct lttng_ctx_field *field, | |
1995 | struct lttng_ctx_value *value)) | |
1996 | { | |
bdb12629 | 1997 | struct lttng_ust_session_private *session_priv; |
53569322 | 1998 | |
bdb12629 | 1999 | cds_list_for_each_entry(session_priv, &sessions, node) { |
53569322 | 2000 | struct lttng_channel *chan; |
2e70391c | 2001 | struct lttng_ust_event_recorder_private *event_recorder_priv; |
53569322 MD |
2002 | int ret; |
2003 | ||
bdb12629 | 2004 | ret = lttng_ust_context_set_provider_rcu(&session_priv->ctx, |
53569322 MD |
2005 | name, get_size, record, get_value); |
2006 | if (ret) | |
2007 | abort(); | |
bdb12629 | 2008 | cds_list_for_each_entry(chan, &session_priv->chan_head, node) { |
53569322 MD |
2009 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, |
2010 | name, get_size, record, get_value); | |
2011 | if (ret) | |
2012 | abort(); | |
2013 | } | |
2e70391c MD |
2014 | cds_list_for_each_entry(event_recorder_priv, &session_priv->events_head, node) { |
2015 | ret = lttng_ust_context_set_provider_rcu(&event_recorder_priv->pub->ctx, | |
53569322 MD |
2016 | name, get_size, record, get_value); |
2017 | if (ret) | |
2018 | abort(); | |
2019 | } | |
2020 | } | |
2021 | } | |
d8d2416d FD |
2022 | |
2023 | /* | |
2024 | * Update all event_notifier groups with the given app context. | |
2025 | * Called with ust lock held. | |
2026 | * This is invoked when an application context gets loaded/unloaded. It | |
2027 | * ensures the context callbacks are in sync with the application | |
2028 | * context (either app context callbacks, or dummy callbacks). | |
2029 | */ | |
2030 | void lttng_ust_context_set_event_notifier_group_provider(const char *name, | |
2031 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
2032 | void (*record)(struct lttng_ctx_field *field, | |
2033 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
2034 | struct lttng_channel *chan), | |
2035 | void (*get_value)(struct lttng_ctx_field *field, | |
2036 | struct lttng_ctx_value *value)) | |
2037 | { | |
2038 | struct lttng_event_notifier_group *event_notifier_group; | |
2039 | ||
2040 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2041 | int ret; | |
2042 | ||
2043 | ret = lttng_ust_context_set_provider_rcu( | |
2044 | &event_notifier_group->ctx, | |
2045 | name, get_size, record, get_value); | |
2046 | if (ret) | |
2047 | abort(); | |
2048 | } | |
2049 | } |