Commit | Line | Data |
---|---|---|
8020ceb5 | 1 | /* |
7dd08bec | 2 | * lttng-events.c |
8020ceb5 | 3 | * |
8020ceb5 MD |
4 | * Holds LTTng per-session event registry. |
5 | * | |
e92f3e28 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
8020ceb5 MD |
21 | */ |
22 | ||
b5234c06 MD |
23 | #define _GNU_SOURCE |
24 | #include <stdio.h> | |
25 | #include <urcu/list.h> | |
8165c8da | 26 | #include <urcu/hlist.h> |
b5234c06 | 27 | #include <pthread.h> |
b5234c06 | 28 | #include <errno.h> |
f4681817 MD |
29 | #include <sys/shm.h> |
30 | #include <sys/ipc.h> | |
44c72f10 MD |
31 | #include <stdint.h> |
32 | #include <stddef.h> | |
28b12049 MD |
33 | #include <inttypes.h> |
34 | #include <time.h> | |
2ae57758 | 35 | #include <lttng/ust-endian.h> |
28b12049 | 36 | #include "clock.h" |
44c72f10 MD |
37 | |
38 | #include <urcu-bp.h> | |
39 | #include <urcu/compiler.h> | |
40 | #include <urcu/uatomic.h> | |
41 | #include <urcu/arch.h> | |
42 | ||
43 | #include <lttng/tracepoint.h> | |
4318ae1b | 44 | #include <lttng/ust-events.h> |
44c72f10 MD |
45 | |
46 | #include <usterr-signal-safe.h> | |
47 | #include <helper.h> | |
7d3e35b6 | 48 | #include <lttng/ust-ctl.h> |
32ce8569 | 49 | #include <ust-comm.h> |
53569322 MD |
50 | #include <lttng/ust-dynamic-type.h> |
51 | #include <lttng/ust-context-provider.h> | |
1f18504e | 52 | #include "error.h" |
08114193 | 53 | #include "compat.h" |
eda498b8 | 54 | #include "lttng-ust-uuid.h" |
44c72f10 | 55 | |
457a6b58 | 56 | #include "tracepoint-internal.h" |
7dd08bec MD |
57 | #include "lttng-tracer.h" |
58 | #include "lttng-tracer-core.h" | |
cf73e0fe | 59 | #include "lttng-ust-statedump.h" |
b728d87e | 60 | #include "wait.h" |
8d8a24c8 | 61 | #include "../libringbuffer/shm.h" |
596c4223 | 62 | #include "jhash.h" |
8165c8da MD |
63 | |
64 | /* | |
3327ac33 MD |
65 | * All operations within this file are called by the communication |
66 | * thread, under ust_lock protection. | |
8165c8da | 67 | */ |
8165c8da | 68 | |
b5234c06 | 69 | static CDS_LIST_HEAD(sessions); |
8165c8da | 70 | |
37dddb65 MD |
71 | struct cds_list_head *_lttng_get_sessions(void) |
72 | { | |
73 | return &sessions; | |
74 | } | |
75 | ||
7dd08bec | 76 | static void _lttng_event_destroy(struct lttng_event *event); |
c785c634 | 77 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 78 | |
e58095ef MD |
79 | static |
80 | void lttng_session_lazy_sync_enablers(struct lttng_session *session); | |
81 | static | |
82 | void lttng_session_sync_enablers(struct lttng_session *session); | |
83 | static | |
84 | void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
85 | ||
6715d7d1 MD |
86 | /* |
87 | * Called with ust lock held. | |
88 | */ | |
89 | int lttng_session_active(void) | |
90 | { | |
91 | struct lttng_session *iter; | |
92 | ||
93 | cds_list_for_each_entry(iter, &sessions, node) { | |
94 | if (iter->active) | |
95 | return 1; | |
96 | } | |
97 | return 0; | |
98 | } | |
99 | ||
e58095ef MD |
100 | static |
101 | int lttng_loglevel_match(int loglevel, | |
102 | unsigned int has_loglevel, | |
457a6b58 MD |
103 | enum lttng_ust_loglevel_type req_type, |
104 | int req_loglevel) | |
105 | { | |
e58095ef MD |
106 | if (!has_loglevel) |
107 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
108 | switch (req_type) { |
109 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 110 | if (loglevel <= req_loglevel |
67ada458 | 111 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
112 | return 1; |
113 | else | |
114 | return 0; | |
115 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 116 | if (loglevel == req_loglevel |
67ada458 | 117 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
118 | return 1; |
119 | else | |
120 | return 0; | |
121 | case LTTNG_UST_LOGLEVEL_ALL: | |
122 | default: | |
67ada458 | 123 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
124 | return 1; |
125 | else | |
126 | return 0; | |
457a6b58 MD |
127 | } |
128 | } | |
129 | ||
8020ceb5 MD |
130 | void synchronize_trace(void) |
131 | { | |
8020ceb5 | 132 | synchronize_rcu(); |
8020ceb5 MD |
133 | } |
134 | ||
7dd08bec | 135 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 136 | { |
7dd08bec | 137 | struct lttng_session *session; |
74d81a6c | 138 | int i; |
8020ceb5 | 139 | |
7dd08bec | 140 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
141 | if (!session) |
142 | return NULL; | |
53569322 MD |
143 | if (lttng_session_context_init(&session->ctx)) { |
144 | free(session); | |
145 | return NULL; | |
146 | } | |
e58095ef MD |
147 | CDS_INIT_LIST_HEAD(&session->chan_head); |
148 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 149 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 150 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
151 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
152 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
153 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
154 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 155 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
156 | return session; |
157 | } | |
158 | ||
74d81a6c MD |
159 | /* |
160 | * Only used internally at session destruction. | |
161 | */ | |
162 | static | |
163 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
164 | { | |
165 | struct channel *chan; | |
166 | struct lttng_ust_shm_handle *handle; | |
167 | ||
168 | cds_list_del(<tng_chan->node); | |
169 | lttng_destroy_context(lttng_chan->ctx); | |
170 | chan = lttng_chan->chan; | |
171 | handle = lttng_chan->handle; | |
172 | /* | |
173 | * note: lttng_chan is private data contained within handle. It | |
174 | * will be freed along with the handle. | |
175 | */ | |
176 | channel_destroy(chan, handle, 0); | |
177 | } | |
178 | ||
ac6b4ac6 MD |
179 | static |
180 | void register_event(struct lttng_event *event) | |
181 | { | |
182 | int ret; | |
183 | const struct lttng_event_desc *desc; | |
184 | ||
185 | assert(event->registered == 0); | |
186 | desc = event->desc; | |
187 | ret = __tracepoint_probe_register(desc->name, | |
188 | desc->probe_callback, | |
189 | event, desc->signature); | |
190 | WARN_ON_ONCE(ret); | |
191 | if (!ret) | |
192 | event->registered = 1; | |
193 | } | |
194 | ||
195 | static | |
196 | void unregister_event(struct lttng_event *event) | |
197 | { | |
198 | int ret; | |
199 | const struct lttng_event_desc *desc; | |
200 | ||
201 | assert(event->registered == 1); | |
202 | desc = event->desc; | |
203 | ret = __tracepoint_probe_unregister(desc->name, | |
204 | desc->probe_callback, | |
205 | event); | |
206 | WARN_ON_ONCE(ret); | |
207 | if (!ret) | |
208 | event->registered = 0; | |
209 | } | |
210 | ||
211 | /* | |
212 | * Only used internally at session destruction. | |
213 | */ | |
214 | static | |
215 | void _lttng_event_unregister(struct lttng_event *event) | |
216 | { | |
217 | if (event->registered) | |
218 | unregister_event(event); | |
219 | } | |
220 | ||
7dd08bec | 221 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 222 | { |
7dd08bec MD |
223 | struct lttng_channel *chan, *tmpchan; |
224 | struct lttng_event *event, *tmpevent; | |
c785c634 | 225 | struct lttng_enum *_enum, *tmp_enum; |
e58095ef | 226 | struct lttng_enabler *enabler, *tmpenabler; |
8020ceb5 | 227 | |
b5234c06 | 228 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 229 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 230 | _lttng_event_unregister(event); |
8020ceb5 MD |
231 | } |
232 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e58095ef MD |
233 | cds_list_for_each_entry_safe(enabler, tmpenabler, |
234 | &session->enablers_head, node) | |
235 | lttng_enabler_destroy(enabler); | |
236 | cds_list_for_each_entry_safe(event, tmpevent, | |
237 | &session->events_head, node) | |
7dd08bec | 238 | _lttng_event_destroy(event); |
c785c634 MD |
239 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
240 | &session->enums_head, node) | |
241 | _lttng_enum_destroy(_enum); | |
e58095ef | 242 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 243 | _lttng_channel_unmap(chan); |
e58095ef | 244 | cds_list_del(&session->node); |
53569322 | 245 | lttng_destroy_context(session->ctx); |
b5234c06 | 246 | free(session); |
8020ceb5 MD |
247 | } |
248 | ||
53569322 MD |
249 | static |
250 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
251 | struct lttng_session *session) | |
252 | { | |
253 | const char *enum_name = desc->name; | |
254 | struct lttng_enum *_enum; | |
255 | struct cds_hlist_head *head; | |
256 | struct cds_hlist_node *node; | |
257 | int ret = 0; | |
258 | size_t name_len = strlen(enum_name); | |
259 | uint32_t hash; | |
260 | int notify_socket; | |
261 | ||
262 | hash = jhash(enum_name, name_len, 0); | |
263 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
264 | cds_hlist_for_each_entry(_enum, node, head, hlist) { | |
265 | assert(_enum->desc); | |
266 | if (!strncmp(_enum->desc->name, desc->name, | |
267 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
268 | ret = -EEXIST; | |
269 | goto exist; | |
270 | } | |
271 | } | |
272 | ||
273 | notify_socket = lttng_get_notify_socket(session->owner); | |
274 | if (notify_socket < 0) { | |
275 | ret = notify_socket; | |
276 | goto socket_error; | |
277 | } | |
278 | ||
279 | _enum = zmalloc(sizeof(*_enum)); | |
280 | if (!_enum) { | |
281 | ret = -ENOMEM; | |
282 | goto cache_error; | |
283 | } | |
284 | _enum->session = session; | |
285 | _enum->desc = desc; | |
286 | ||
287 | ret = ustcomm_register_enum(notify_socket, | |
288 | session->objd, | |
289 | enum_name, | |
290 | desc->nr_entries, | |
291 | desc->entries, | |
292 | &_enum->id); | |
293 | if (ret < 0) { | |
294 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
295 | goto sessiond_register_error; | |
296 | } | |
297 | cds_list_add(&_enum->node, &session->enums_head); | |
298 | cds_hlist_add_head(&_enum->hlist, head); | |
299 | return 0; | |
300 | ||
301 | sessiond_register_error: | |
302 | free(_enum); | |
303 | cache_error: | |
304 | socket_error: | |
305 | exist: | |
306 | return ret; | |
307 | } | |
308 | ||
309 | static | |
310 | int lttng_create_enum_check(const struct lttng_type *type, | |
311 | struct lttng_session *session) | |
312 | { | |
313 | switch (type->atype) { | |
314 | case atype_enum: | |
315 | { | |
316 | const struct lttng_enum_desc *enum_desc; | |
317 | int ret; | |
318 | ||
319 | enum_desc = type->u.basic.enumeration.desc; | |
320 | ret = lttng_enum_create(enum_desc, session); | |
321 | if (ret && ret != -EEXIST) { | |
322 | DBG("Unable to create enum error: (%d)", ret); | |
323 | return ret; | |
324 | } | |
325 | break; | |
326 | } | |
327 | case atype_dynamic: | |
328 | { | |
329 | const struct lttng_event_field *tag_field_generic; | |
330 | const struct lttng_enum_desc *enum_desc; | |
331 | int ret; | |
332 | ||
333 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
334 | enum_desc = tag_field_generic->type.u.basic.enumeration.desc; | |
335 | ret = lttng_enum_create(enum_desc, session); | |
336 | if (ret && ret != -EEXIST) { | |
337 | DBG("Unable to create enum error: (%d)", ret); | |
338 | return ret; | |
339 | } | |
340 | break; | |
341 | } | |
342 | default: | |
343 | /* TODO: nested types when they become supported. */ | |
344 | break; | |
345 | } | |
346 | return 0; | |
347 | } | |
348 | ||
349 | static | |
350 | int lttng_create_all_event_enums(size_t nr_fields, | |
351 | const struct lttng_event_field *event_fields, | |
352 | struct lttng_session *session) | |
353 | { | |
354 | size_t i; | |
355 | int ret; | |
356 | ||
357 | /* For each field, ensure enum is part of the session. */ | |
358 | for (i = 0; i < nr_fields; i++) { | |
359 | const struct lttng_type *type = &event_fields[i].type; | |
360 | ||
361 | ret = lttng_create_enum_check(type, session); | |
362 | if (ret) | |
363 | return ret; | |
364 | } | |
365 | return 0; | |
366 | } | |
367 | ||
368 | static | |
369 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
370 | const struct lttng_ctx_field *ctx_fields, | |
371 | struct lttng_session *session) | |
372 | { | |
373 | size_t i; | |
374 | int ret; | |
375 | ||
376 | /* For each field, ensure enum is part of the session. */ | |
377 | for (i = 0; i < nr_fields; i++) { | |
378 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
379 | ||
380 | ret = lttng_create_enum_check(type, session); | |
381 | if (ret) | |
382 | return ret; | |
383 | } | |
384 | return 0; | |
385 | } | |
386 | ||
710b8ee3 MD |
387 | /* |
388 | * Ensure that a state-dump will be performed for this session at the end | |
389 | * of the current handle_message(). | |
390 | */ | |
391 | int lttng_session_statedump(struct lttng_session *session) | |
392 | { | |
393 | session->statedump_pending = 1; | |
394 | lttng_ust_sockinfo_session_enabled(session->owner); | |
395 | return 0; | |
396 | } | |
53569322 | 397 | |
7dd08bec | 398 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
399 | { |
400 | int ret = 0; | |
7dd08bec | 401 | struct lttng_channel *chan; |
32ce8569 | 402 | int notify_socket; |
8020ceb5 | 403 | |
8020ceb5 MD |
404 | if (session->active) { |
405 | ret = -EBUSY; | |
406 | goto end; | |
407 | } | |
408 | ||
32ce8569 MD |
409 | notify_socket = lttng_get_notify_socket(session->owner); |
410 | if (notify_socket < 0) | |
411 | return notify_socket; | |
412 | ||
ac6b4ac6 MD |
413 | /* Set transient enabler state to "enabled" */ |
414 | session->tstate = 1; | |
e58095ef | 415 | |
8020ceb5 MD |
416 | /* |
417 | * Snapshot the number of events per channel to know the type of header | |
418 | * we need to use. | |
419 | */ | |
e58095ef | 420 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 421 | const struct lttng_ctx *ctx; |
83e43212 | 422 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 423 | size_t nr_fields = 0; |
6ca18e66 | 424 | uint32_t chan_id; |
32ce8569 MD |
425 | |
426 | /* don't change it if session stop/restart */ | |
8020ceb5 | 427 | if (chan->header_type) |
32ce8569 MD |
428 | continue; |
429 | ctx = chan->ctx; | |
430 | if (ctx) { | |
431 | nr_fields = ctx->nr_fields; | |
83e43212 | 432 | fields = ctx->fields; |
53569322 MD |
433 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
434 | session); | |
435 | if (ret < 0) { | |
436 | DBG("Error (%d) adding enum to session", ret); | |
437 | return ret; | |
438 | } | |
32ce8569 MD |
439 | } |
440 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 441 | session, |
32ce8569 MD |
442 | session->objd, |
443 | chan->objd, | |
444 | nr_fields, | |
445 | fields, | |
6ca18e66 | 446 | &chan_id, |
32ce8569 | 447 | &chan->header_type); |
b869b5ae MD |
448 | if (ret) { |
449 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 450 | return ret; |
b869b5ae | 451 | } |
6ca18e66 MD |
452 | if (chan_id != chan->id) { |
453 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
454 | chan_id, chan->id); | |
455 | return -EINVAL; | |
456 | } | |
8020ceb5 MD |
457 | } |
458 | ||
5c055275 FD |
459 | /* We need to sync enablers with session before activation. */ |
460 | lttng_session_sync_enablers(session); | |
461 | ||
ac6b4ac6 | 462 | /* Set atomically the state to "active" */ |
b5234c06 MD |
463 | CMM_ACCESS_ONCE(session->active) = 1; |
464 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 465 | |
710b8ee3 MD |
466 | ret = lttng_session_statedump(session); |
467 | if (ret) | |
468 | return ret; | |
8020ceb5 | 469 | end: |
8020ceb5 MD |
470 | return ret; |
471 | } | |
472 | ||
7dd08bec | 473 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
474 | { |
475 | int ret = 0; | |
476 | ||
8020ceb5 MD |
477 | if (!session->active) { |
478 | ret = -EBUSY; | |
479 | goto end; | |
480 | } | |
ac6b4ac6 | 481 | /* Set atomically the state to "inactive" */ |
b5234c06 | 482 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
483 | |
484 | /* Set transient enabler state to "disabled" */ | |
485 | session->tstate = 0; | |
486 | lttng_session_sync_enablers(session); | |
8020ceb5 | 487 | end: |
8020ceb5 MD |
488 | return ret; |
489 | } | |
490 | ||
7dd08bec | 491 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 492 | { |
ac6b4ac6 | 493 | int ret = 0; |
976fe9ea | 494 | |
ac6b4ac6 MD |
495 | if (channel->enabled) { |
496 | ret = -EBUSY; | |
497 | goto end; | |
498 | } | |
499 | /* Set transient enabler state to "enabled" */ | |
500 | channel->tstate = 1; | |
501 | lttng_session_sync_enablers(channel->session); | |
502 | /* Set atomically the state to "enabled" */ | |
503 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
504 | end: | |
505 | return ret; | |
976fe9ea MD |
506 | } |
507 | ||
7dd08bec | 508 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 509 | { |
ac6b4ac6 | 510 | int ret = 0; |
976fe9ea | 511 | |
ac6b4ac6 MD |
512 | if (!channel->enabled) { |
513 | ret = -EBUSY; | |
514 | goto end; | |
515 | } | |
516 | /* Set atomically the state to "disabled" */ | |
517 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
518 | /* Set transient enabler state to "enabled" */ | |
519 | channel->tstate = 0; | |
520 | lttng_session_sync_enablers(channel->session); | |
521 | end: | |
522 | return ret; | |
976fe9ea MD |
523 | } |
524 | ||
8020ceb5 MD |
525 | /* |
526 | * Supports event creation while tracing session is active. | |
527 | */ | |
e58095ef MD |
528 | static |
529 | int lttng_event_create(const struct lttng_event_desc *desc, | |
530 | struct lttng_channel *chan) | |
8020ceb5 | 531 | { |
e58095ef | 532 | const char *event_name = desc->name; |
7dd08bec | 533 | struct lttng_event *event; |
32ce8569 | 534 | struct lttng_session *session = chan->session; |
d56fa719 MD |
535 | struct cds_hlist_head *head; |
536 | struct cds_hlist_node *node; | |
576599a0 | 537 | int ret = 0; |
d56fa719 MD |
538 | size_t name_len = strlen(event_name); |
539 | uint32_t hash; | |
32ce8569 MD |
540 | int notify_socket, loglevel; |
541 | const char *uri; | |
8020ceb5 | 542 | |
d56fa719 MD |
543 | hash = jhash(event_name, name_len, 0); |
544 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
545 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef | 546 | assert(event->desc); |
d970f72e MD |
547 | if (!strncmp(event->desc->name, desc->name, |
548 | LTTNG_UST_SYM_NAME_LEN - 1) | |
549 | && chan == event->chan) { | |
576599a0 | 550 | ret = -EEXIST; |
8020ceb5 | 551 | goto exist; |
576599a0 MD |
552 | } |
553 | } | |
457a6b58 | 554 | |
32ce8569 MD |
555 | notify_socket = lttng_get_notify_socket(session->owner); |
556 | if (notify_socket < 0) { | |
557 | ret = notify_socket; | |
558 | goto socket_error; | |
559 | } | |
560 | ||
53569322 MD |
561 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
562 | session); | |
c785c634 MD |
563 | if (ret < 0) { |
564 | DBG("Error (%d) adding enum to session", ret); | |
565 | goto create_enum_error; | |
566 | } | |
567 | ||
457a6b58 MD |
568 | /* |
569 | * Check if loglevel match. Refuse to connect event if not. | |
570 | */ | |
7dd08bec | 571 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
572 | if (!event) { |
573 | ret = -ENOMEM; | |
8020ceb5 | 574 | goto cache_error; |
576599a0 | 575 | } |
8020ceb5 | 576 | event->chan = chan; |
e58095ef | 577 | |
ac6b4ac6 MD |
578 | /* Event will be enabled by enabler sync. */ |
579 | event->enabled = 0; | |
580 | event->registered = 0; | |
e58095ef MD |
581 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
582 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
583 | event->desc = desc; | |
32ce8569 MD |
584 | |
585 | if (desc->loglevel) | |
586 | loglevel = *(*event->desc->loglevel); | |
587 | else | |
588 | loglevel = TRACE_DEFAULT; | |
589 | if (desc->u.ext.model_emf_uri) | |
590 | uri = *(desc->u.ext.model_emf_uri); | |
591 | else | |
592 | uri = NULL; | |
593 | ||
13b21cd6 MD |
594 | /* Fetch event ID from sessiond */ |
595 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 596 | session, |
13b21cd6 MD |
597 | session->objd, |
598 | chan->objd, | |
599 | event_name, | |
600 | loglevel, | |
601 | desc->signature, | |
602 | desc->nr_fields, | |
603 | desc->fields, | |
604 | uri, | |
605 | &event->id); | |
606 | if (ret < 0) { | |
607 | DBG("Error (%d) registering event to sessiond", ret); | |
608 | goto sessiond_register_error; | |
32ce8569 | 609 | } |
2b213b16 | 610 | |
7dd08bec | 611 | /* Populate lttng_event structure before tracepoint registration. */ |
b5234c06 | 612 | cmm_smp_wmb(); |
e58095ef | 613 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 614 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 615 | return 0; |
8020ceb5 | 616 | |
32ce8569 | 617 | sessiond_register_error: |
b5234c06 | 618 | free(event); |
8020ceb5 | 619 | cache_error: |
c785c634 | 620 | create_enum_error: |
32ce8569 | 621 | socket_error: |
8020ceb5 | 622 | exist: |
576599a0 | 623 | return ret; |
8020ceb5 MD |
624 | } |
625 | ||
e58095ef MD |
626 | static |
627 | int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, | |
628 | struct lttng_enabler *enabler) | |
629 | { | |
630 | int loglevel = 0; | |
7e2e405c | 631 | unsigned int has_loglevel = 0; |
e58095ef MD |
632 | |
633 | assert(enabler->type == LTTNG_ENABLER_WILDCARD); | |
634 | /* Compare excluding final '*' */ | |
635 | if (strncmp(desc->name, enabler->event_param.name, | |
636 | strlen(enabler->event_param.name) - 1)) | |
637 | return 0; | |
638 | if (desc->loglevel) { | |
639 | loglevel = *(*desc->loglevel); | |
640 | has_loglevel = 1; | |
641 | } | |
642 | if (!lttng_loglevel_match(loglevel, | |
643 | has_loglevel, | |
644 | enabler->event_param.loglevel_type, | |
645 | enabler->event_param.loglevel)) | |
646 | return 0; | |
647 | return 1; | |
648 | } | |
649 | ||
650 | static | |
651 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
652 | struct lttng_enabler *enabler) | |
653 | { | |
654 | int loglevel = 0; | |
655 | unsigned int has_loglevel = 0; | |
656 | ||
657 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
658 | if (strcmp(desc->name, enabler->event_param.name)) | |
659 | return 0; | |
660 | if (desc->loglevel) { | |
661 | loglevel = *(*desc->loglevel); | |
662 | has_loglevel = 1; | |
663 | } | |
664 | if (!lttng_loglevel_match(loglevel, | |
665 | has_loglevel, | |
666 | enabler->event_param.loglevel_type, | |
667 | enabler->event_param.loglevel)) | |
668 | return 0; | |
669 | return 1; | |
670 | } | |
671 | ||
672 | static | |
673 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
674 | struct lttng_enabler *enabler) | |
675 | { | |
ed5b5bbd JI |
676 | struct lttng_ust_excluder_node *excluder; |
677 | ||
678 | /* If event matches with an excluder, return 'does not match' */ | |
679 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
680 | int count; | |
681 | ||
682 | for (count = 0; count < excluder->excluder.count; count++) { | |
683 | int found, len; | |
684 | char *excluder_name; | |
685 | ||
686 | excluder_name = (char *) (excluder->excluder.names) | |
687 | + count * LTTNG_UST_SYM_NAME_LEN; | |
688 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
689 | if (len > 0 && excluder_name[len - 1] == '*') { | |
690 | found = !strncmp(desc->name, excluder_name, | |
691 | len - 1); | |
692 | } else { | |
693 | found = !strncmp(desc->name, excluder_name, | |
694 | LTTNG_UST_SYM_NAME_LEN - 1); | |
695 | } | |
696 | if (found) { | |
697 | return 0; | |
698 | } | |
699 | } | |
700 | } | |
e58095ef MD |
701 | switch (enabler->type) { |
702 | case LTTNG_ENABLER_WILDCARD: | |
703 | return lttng_desc_match_wildcard_enabler(desc, enabler); | |
704 | case LTTNG_ENABLER_EVENT: | |
705 | return lttng_desc_match_event_enabler(desc, enabler); | |
706 | default: | |
707 | return -EINVAL; | |
708 | } | |
709 | } | |
710 | ||
711 | static | |
712 | int lttng_event_match_enabler(struct lttng_event *event, | |
713 | struct lttng_enabler *enabler) | |
714 | { | |
d970f72e MD |
715 | if (lttng_desc_match_enabler(event->desc, enabler) |
716 | && event->chan == enabler->chan) | |
717 | return 1; | |
718 | else | |
719 | return 0; | |
e58095ef MD |
720 | } |
721 | ||
722 | static | |
723 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
724 | struct lttng_enabler *enabler) | |
725 | { | |
726 | struct lttng_enabler_ref *enabler_ref; | |
727 | ||
728 | cds_list_for_each_entry(enabler_ref, | |
729 | &event->enablers_ref_head, node) { | |
730 | if (enabler_ref->ref == enabler) | |
731 | return enabler_ref; | |
732 | } | |
733 | return NULL; | |
734 | } | |
735 | ||
8020ceb5 | 736 | /* |
e58095ef MD |
737 | * Create struct lttng_event if it is missing and present in the list of |
738 | * tracepoint probes. | |
8020ceb5 | 739 | */ |
e58095ef MD |
740 | static |
741 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 742 | { |
e58095ef MD |
743 | struct lttng_session *session = enabler->chan->session; |
744 | struct lttng_probe_desc *probe_desc; | |
745 | const struct lttng_event_desc *desc; | |
746 | struct lttng_event *event; | |
747 | int i; | |
748 | struct cds_list_head *probe_list; | |
749 | ||
750 | probe_list = lttng_get_probe_list_head(); | |
751 | /* | |
752 | * For each probe event, if we find that a probe event matches | |
753 | * our enabler, create an associated lttng_event if not | |
754 | * already present. | |
755 | */ | |
756 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
757 | for (i = 0; i < probe_desc->nr_events; i++) { | |
758 | int found = 0, ret; | |
d56fa719 MD |
759 | struct cds_hlist_head *head; |
760 | struct cds_hlist_node *node; | |
761 | const char *event_name; | |
762 | size_t name_len; | |
763 | uint32_t hash; | |
e58095ef MD |
764 | |
765 | desc = probe_desc->event_desc[i]; | |
766 | if (!lttng_desc_match_enabler(desc, enabler)) | |
767 | continue; | |
d56fa719 MD |
768 | event_name = desc->name; |
769 | name_len = strlen(event_name); | |
e58095ef MD |
770 | |
771 | /* | |
d56fa719 | 772 | * Check if already created. |
e58095ef | 773 | */ |
d56fa719 MD |
774 | hash = jhash(event_name, name_len, 0); |
775 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
776 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
d970f72e MD |
777 | if (event->desc == desc |
778 | && event->chan == enabler->chan) | |
e58095ef MD |
779 | found = 1; |
780 | } | |
781 | if (found) | |
782 | continue; | |
783 | ||
784 | /* | |
785 | * We need to create an event for this | |
786 | * event probe. | |
787 | */ | |
788 | ret = lttng_event_create(probe_desc->event_desc[i], | |
789 | enabler->chan); | |
790 | if (ret) { | |
32ce8569 MD |
791 | DBG("Unable to create event %s, error %d\n", |
792 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 793 | } |
8165c8da | 794 | } |
8020ceb5 | 795 | } |
8020ceb5 MD |
796 | } |
797 | ||
798 | /* | |
e58095ef MD |
799 | * Create events associated with an enabler (if not already present), |
800 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
801 | */ |
802 | static | |
e58095ef | 803 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 804 | { |
e58095ef MD |
805 | struct lttng_session *session = enabler->chan->session; |
806 | struct lttng_event *event; | |
807 | ||
808 | /* First ensure that probe events are created for this enabler. */ | |
809 | lttng_create_event_if_missing(enabler); | |
810 | ||
811 | /* For each event matching enabler in session event list. */ | |
812 | cds_list_for_each_entry(event, &session->events_head, node) { | |
813 | struct lttng_enabler_ref *enabler_ref; | |
814 | ||
815 | if (!lttng_event_match_enabler(event, enabler)) | |
816 | continue; | |
817 | ||
818 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
819 | if (!enabler_ref) { | |
820 | /* | |
821 | * If no backward ref, create it. | |
822 | * Add backward ref from event to enabler. | |
823 | */ | |
824 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
825 | if (!enabler_ref) | |
826 | return -ENOMEM; | |
827 | enabler_ref->ref = enabler; | |
828 | cds_list_add(&enabler_ref->node, | |
829 | &event->enablers_ref_head); | |
8165c8da | 830 | } |
e58095ef MD |
831 | |
832 | /* | |
833 | * Link filter bytecodes if not linked yet. | |
834 | */ | |
835 | lttng_enabler_event_link_bytecode(event, enabler); | |
836 | ||
837 | /* TODO: merge event context. */ | |
838 | } | |
839 | return 0; | |
840 | } | |
841 | ||
842 | /* | |
843 | * Called at library load: connect the probe on all enablers matching | |
844 | * this event. | |
5f733922 | 845 | * Called with session mutex held. |
e58095ef | 846 | */ |
5f733922 | 847 | int lttng_fix_pending_events(void) |
e58095ef MD |
848 | { |
849 | struct lttng_session *session; | |
850 | ||
851 | cds_list_for_each_entry(session, &sessions, node) { | |
852 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 853 | } |
e58095ef MD |
854 | return 0; |
855 | } | |
856 | ||
246be17e | 857 | /* |
37dddb65 MD |
858 | * For each session of the owner thread, execute pending statedump. |
859 | * Only dump state for the sessions owned by the caller thread, because | |
860 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 861 | */ |
3327ac33 | 862 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
863 | { |
864 | struct lttng_session *session; | |
865 | ||
37dddb65 | 866 | /* Execute state dump */ |
cf73e0fe | 867 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
868 | |
869 | /* Clear pending state dump */ | |
3327ac33 MD |
870 | if (ust_lock()) { |
871 | goto end; | |
872 | } | |
246be17e | 873 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
874 | if (session->owner != owner) |
875 | continue; | |
876 | if (!session->statedump_pending) | |
877 | continue; | |
878 | session->statedump_pending = 0; | |
246be17e | 879 | } |
3327ac33 | 880 | end: |
37dddb65 | 881 | ust_unlock(); |
3327ac33 | 882 | return; |
246be17e PW |
883 | } |
884 | ||
e58095ef MD |
885 | /* |
886 | * Only used internally at session destruction. | |
887 | */ | |
888 | static | |
889 | void _lttng_event_destroy(struct lttng_event *event) | |
890 | { | |
891 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
892 | ||
e58095ef | 893 | cds_list_del(&event->node); |
8020ceb5 | 894 | lttng_destroy_context(event->ctx); |
f488575f | 895 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
896 | /* Free event enabler refs */ |
897 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
898 | &event->enablers_ref_head, node) | |
899 | free(enabler_ref); | |
b5234c06 | 900 | free(event); |
8020ceb5 MD |
901 | } |
902 | ||
c785c634 MD |
903 | static |
904 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
905 | { | |
906 | cds_list_del(&_enum->node); | |
907 | free(_enum); | |
908 | } | |
909 | ||
003fedf4 | 910 | void lttng_ust_events_exit(void) |
8020ceb5 | 911 | { |
7dd08bec | 912 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 913 | |
e58095ef | 914 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 915 | lttng_session_destroy(session); |
8020ceb5 | 916 | } |
457a6b58 | 917 | |
e58095ef MD |
918 | /* |
919 | * Enabler management. | |
920 | */ | |
921 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
922 | struct lttng_ust_event *event_param, | |
923 | struct lttng_channel *chan) | |
457a6b58 | 924 | { |
e58095ef MD |
925 | struct lttng_enabler *enabler; |
926 | ||
927 | enabler = zmalloc(sizeof(*enabler)); | |
928 | if (!enabler) | |
929 | return NULL; | |
930 | enabler->type = type; | |
931 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
0f63324a | 932 | CDS_INIT_LIST_HEAD(&enabler->excluder_head); |
e58095ef MD |
933 | memcpy(&enabler->event_param, event_param, |
934 | sizeof(enabler->event_param)); | |
935 | enabler->chan = chan; | |
936 | /* ctx left NULL */ | |
89f26d57 | 937 | enabler->enabled = 0; |
e58095ef MD |
938 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); |
939 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
940 | return enabler; | |
457a6b58 MD |
941 | } |
942 | ||
e58095ef | 943 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 944 | { |
e58095ef MD |
945 | enabler->enabled = 1; |
946 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
947 | return 0; | |
457a6b58 | 948 | } |
457a6b58 | 949 | |
e58095ef | 950 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 951 | { |
e58095ef MD |
952 | enabler->enabled = 0; |
953 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
954 | return 0; | |
955 | } | |
457a6b58 | 956 | |
e58095ef MD |
957 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
958 | struct lttng_ust_filter_bytecode_node *bytecode) | |
959 | { | |
960 | bytecode->enabler = enabler; | |
961 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
962 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
963 | return 0; | |
0bfb5cbd JI |
964 | } |
965 | ||
966 | int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
967 | struct lttng_ust_excluder_node *excluder) | |
968 | { | |
969 | excluder->enabler = enabler; | |
970 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
971 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
972 | return 0; | |
e58095ef | 973 | } |
f488575f | 974 | |
e58095ef | 975 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 976 | union ust_args *uargs, |
e58095ef MD |
977 | struct lttng_ctx **ctx, struct lttng_session *session) |
978 | { | |
457a6b58 | 979 | /* |
e58095ef MD |
980 | * We cannot attach a context after trace has been started for a |
981 | * session because the metadata does not allow expressing this | |
982 | * information outside of the original channel scope. | |
457a6b58 | 983 | */ |
e58095ef MD |
984 | if (session->been_active) |
985 | return -EPERM; | |
457a6b58 | 986 | |
e58095ef MD |
987 | switch (context_param->ctx) { |
988 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
989 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
990 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
991 | { | |
992 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
993 | ||
994 | perf_ctx_param = &context_param->u.perf_counter; | |
995 | return lttng_add_perf_counter_to_ctx( | |
996 | perf_ctx_param->type, | |
997 | perf_ctx_param->config, | |
998 | perf_ctx_param->name, | |
999 | ctx); | |
1000 | } | |
e58095ef MD |
1001 | case LTTNG_UST_CONTEXT_VTID: |
1002 | return lttng_add_vtid_to_ctx(ctx); | |
1003 | case LTTNG_UST_CONTEXT_VPID: | |
1004 | return lttng_add_vpid_to_ctx(ctx); | |
1005 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1006 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1007 | case LTTNG_UST_CONTEXT_IP: |
1008 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1009 | case LTTNG_UST_CONTEXT_CPU_ID: |
1010 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1011 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1012 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1013 | ctx); | |
e58095ef MD |
1014 | default: |
1015 | return -EINVAL; | |
457a6b58 | 1016 | } |
457a6b58 MD |
1017 | } |
1018 | ||
e58095ef MD |
1019 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1020 | struct lttng_ust_context *context_param) | |
457a6b58 | 1021 | { |
e58095ef MD |
1022 | #if 0 // disabled for now. |
1023 | struct lttng_session *session = enabler->chan->session; | |
1024 | int ret; | |
457a6b58 | 1025 | |
e58095ef MD |
1026 | ret = lttng_attach_context(context_param, &enabler->ctx, |
1027 | session); | |
1028 | if (ret) | |
1029 | return ret; | |
1030 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1031 | #endif | |
1032 | return -ENOSYS; | |
457a6b58 MD |
1033 | } |
1034 | ||
e58095ef MD |
1035 | static |
1036 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 1037 | { |
e58095ef | 1038 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
0f63324a | 1039 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
457a6b58 | 1040 | |
e58095ef MD |
1041 | /* Destroy filter bytecode */ |
1042 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1043 | &enabler->filter_bytecode_head, node) { | |
1044 | free(filter_node); | |
457a6b58 | 1045 | } |
e58095ef | 1046 | |
0f63324a JI |
1047 | /* Destroy excluders */ |
1048 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
1049 | &enabler->excluder_head, node) { | |
1050 | free(excluder_node); | |
1051 | } | |
1052 | ||
e58095ef MD |
1053 | /* Destroy contexts */ |
1054 | lttng_destroy_context(enabler->ctx); | |
1055 | ||
1056 | cds_list_del(&enabler->node); | |
1057 | free(enabler); | |
457a6b58 MD |
1058 | } |
1059 | ||
e58095ef MD |
1060 | /* |
1061 | * lttng_session_sync_enablers should be called just before starting a | |
1062 | * session. | |
1063 | */ | |
457a6b58 | 1064 | static |
e58095ef | 1065 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 1066 | { |
e58095ef MD |
1067 | struct lttng_enabler *enabler; |
1068 | struct lttng_event *event; | |
457a6b58 | 1069 | |
e58095ef MD |
1070 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
1071 | lttng_enabler_ref_events(enabler); | |
1072 | /* | |
1073 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1074 | * and its channel and session transient states are enabled, we |
1075 | * enable the event, else we disable it. | |
e58095ef MD |
1076 | */ |
1077 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1078 | struct lttng_enabler_ref *enabler_ref; | |
1079 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1080 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1081 | |
1082 | /* Enable events */ | |
1083 | cds_list_for_each_entry(enabler_ref, | |
1084 | &event->enablers_ref_head, node) { | |
1085 | if (enabler_ref->ref->enabled) { | |
1086 | enabled = 1; | |
1087 | break; | |
1088 | } | |
1089 | } | |
ac6b4ac6 MD |
1090 | /* |
1091 | * Enabled state is based on union of enablers, with | |
1092 | * intesection of session and channel transient enable | |
1093 | * states. | |
1094 | */ | |
1095 | enabled = enabled && session->tstate && event->chan->tstate; | |
1096 | ||
1097 | CMM_STORE_SHARED(event->enabled, enabled); | |
1098 | /* | |
1099 | * Sync tracepoint registration with event enabled | |
1100 | * state. | |
1101 | */ | |
1102 | if (enabled) { | |
1103 | if (!event->registered) | |
1104 | register_event(event); | |
1105 | } else { | |
1106 | if (event->registered) | |
1107 | unregister_event(event); | |
1108 | } | |
457a6b58 | 1109 | |
1f49fc05 | 1110 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1111 | cds_list_for_each_entry(enabler_ref, |
1112 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1113 | if (enabler_ref->ref->enabled |
1114 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1115 | has_enablers_without_bytecode = 1; |
1116 | break; | |
1117 | } | |
1118 | } | |
1119 | event->has_enablers_without_bytecode = | |
1120 | has_enablers_without_bytecode; | |
1121 | ||
e58095ef MD |
1122 | /* Enable filters */ |
1123 | cds_list_for_each_entry(runtime, | |
1124 | &event->bytecode_runtime_head, node) { | |
1125 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
1126 | } |
1127 | } | |
457a6b58 MD |
1128 | } |
1129 | ||
e58095ef MD |
1130 | /* |
1131 | * Apply enablers to session events, adding events to session if need | |
1132 | * be. It is required after each modification applied to an active | |
1133 | * session, and right before session "start". | |
1134 | * "lazy" sync means we only sync if required. | |
1135 | */ | |
1136 | static | |
1137 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 1138 | { |
e58095ef MD |
1139 | /* We can skip if session is not active */ |
1140 | if (!session->active) | |
1141 | return; | |
1142 | lttng_session_sync_enablers(session); | |
457a6b58 | 1143 | } |
53569322 MD |
1144 | |
1145 | /* | |
1146 | * Update all sessions with the given app context. | |
1147 | * Called with ust lock held. | |
1148 | * This is invoked when an application context gets loaded/unloaded. It | |
1149 | * ensures the context callbacks are in sync with the application | |
1150 | * context (either app context callbacks, or dummy callbacks). | |
1151 | */ | |
1152 | void lttng_ust_context_set_session_provider(const char *name, | |
1153 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1154 | void (*record)(struct lttng_ctx_field *field, | |
1155 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1156 | struct lttng_channel *chan), | |
1157 | void (*get_value)(struct lttng_ctx_field *field, | |
1158 | struct lttng_ctx_value *value)) | |
1159 | { | |
1160 | struct lttng_session *session; | |
1161 | ||
1162 | cds_list_for_each_entry(session, &sessions, node) { | |
1163 | struct lttng_channel *chan; | |
1164 | struct lttng_event *event; | |
1165 | int ret; | |
1166 | ||
1167 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1168 | name, get_size, record, get_value); | |
1169 | if (ret) | |
1170 | abort(); | |
1171 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1172 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1173 | name, get_size, record, get_value); | |
1174 | if (ret) | |
1175 | abort(); | |
1176 | } | |
1177 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1178 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1179 | name, get_size, record, get_value); | |
1180 | if (ret) | |
1181 | abort(); | |
1182 | } | |
1183 | } | |
1184 | } |