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; | |
baa1e0bc | 187 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
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; | |
baa1e0bc | 203 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
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 */ | |
baa1e0bc | 233 | __tracepoint_probe_prune_release_queue(); |
e58095ef MD |
234 | cds_list_for_each_entry_safe(enabler, tmpenabler, |
235 | &session->enablers_head, node) | |
236 | lttng_enabler_destroy(enabler); | |
237 | cds_list_for_each_entry_safe(event, tmpevent, | |
238 | &session->events_head, node) | |
7dd08bec | 239 | _lttng_event_destroy(event); |
c785c634 MD |
240 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
241 | &session->enums_head, node) | |
242 | _lttng_enum_destroy(_enum); | |
e58095ef | 243 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 244 | _lttng_channel_unmap(chan); |
e58095ef | 245 | cds_list_del(&session->node); |
53569322 | 246 | lttng_destroy_context(session->ctx); |
b5234c06 | 247 | free(session); |
8020ceb5 MD |
248 | } |
249 | ||
53569322 MD |
250 | static |
251 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
252 | struct lttng_session *session) | |
253 | { | |
254 | const char *enum_name = desc->name; | |
255 | struct lttng_enum *_enum; | |
256 | struct cds_hlist_head *head; | |
257 | struct cds_hlist_node *node; | |
258 | int ret = 0; | |
259 | size_t name_len = strlen(enum_name); | |
260 | uint32_t hash; | |
261 | int notify_socket; | |
262 | ||
263 | hash = jhash(enum_name, name_len, 0); | |
264 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
265 | cds_hlist_for_each_entry(_enum, node, head, hlist) { | |
266 | assert(_enum->desc); | |
267 | if (!strncmp(_enum->desc->name, desc->name, | |
268 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
269 | ret = -EEXIST; | |
270 | goto exist; | |
271 | } | |
272 | } | |
273 | ||
274 | notify_socket = lttng_get_notify_socket(session->owner); | |
275 | if (notify_socket < 0) { | |
276 | ret = notify_socket; | |
277 | goto socket_error; | |
278 | } | |
279 | ||
280 | _enum = zmalloc(sizeof(*_enum)); | |
281 | if (!_enum) { | |
282 | ret = -ENOMEM; | |
283 | goto cache_error; | |
284 | } | |
285 | _enum->session = session; | |
286 | _enum->desc = desc; | |
287 | ||
288 | ret = ustcomm_register_enum(notify_socket, | |
289 | session->objd, | |
290 | enum_name, | |
291 | desc->nr_entries, | |
292 | desc->entries, | |
293 | &_enum->id); | |
294 | if (ret < 0) { | |
295 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
296 | goto sessiond_register_error; | |
297 | } | |
298 | cds_list_add(&_enum->node, &session->enums_head); | |
299 | cds_hlist_add_head(&_enum->hlist, head); | |
300 | return 0; | |
301 | ||
302 | sessiond_register_error: | |
303 | free(_enum); | |
304 | cache_error: | |
305 | socket_error: | |
306 | exist: | |
307 | return ret; | |
308 | } | |
309 | ||
310 | static | |
311 | int lttng_create_enum_check(const struct lttng_type *type, | |
312 | struct lttng_session *session) | |
313 | { | |
314 | switch (type->atype) { | |
315 | case atype_enum: | |
316 | { | |
317 | const struct lttng_enum_desc *enum_desc; | |
318 | int ret; | |
319 | ||
320 | enum_desc = type->u.basic.enumeration.desc; | |
321 | ret = lttng_enum_create(enum_desc, session); | |
322 | if (ret && ret != -EEXIST) { | |
323 | DBG("Unable to create enum error: (%d)", ret); | |
324 | return ret; | |
325 | } | |
326 | break; | |
327 | } | |
328 | case atype_dynamic: | |
329 | { | |
330 | const struct lttng_event_field *tag_field_generic; | |
331 | const struct lttng_enum_desc *enum_desc; | |
332 | int ret; | |
333 | ||
334 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
335 | enum_desc = tag_field_generic->type.u.basic.enumeration.desc; | |
336 | ret = lttng_enum_create(enum_desc, session); | |
337 | if (ret && ret != -EEXIST) { | |
338 | DBG("Unable to create enum error: (%d)", ret); | |
339 | return ret; | |
340 | } | |
341 | break; | |
342 | } | |
343 | default: | |
344 | /* TODO: nested types when they become supported. */ | |
345 | break; | |
346 | } | |
347 | return 0; | |
348 | } | |
349 | ||
350 | static | |
351 | int lttng_create_all_event_enums(size_t nr_fields, | |
352 | const struct lttng_event_field *event_fields, | |
353 | struct lttng_session *session) | |
354 | { | |
355 | size_t i; | |
356 | int ret; | |
357 | ||
358 | /* For each field, ensure enum is part of the session. */ | |
359 | for (i = 0; i < nr_fields; i++) { | |
360 | const struct lttng_type *type = &event_fields[i].type; | |
361 | ||
362 | ret = lttng_create_enum_check(type, session); | |
363 | if (ret) | |
364 | return ret; | |
365 | } | |
366 | return 0; | |
367 | } | |
368 | ||
369 | static | |
370 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
371 | const struct lttng_ctx_field *ctx_fields, | |
372 | struct lttng_session *session) | |
373 | { | |
374 | size_t i; | |
375 | int ret; | |
376 | ||
377 | /* For each field, ensure enum is part of the session. */ | |
378 | for (i = 0; i < nr_fields; i++) { | |
379 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
380 | ||
381 | ret = lttng_create_enum_check(type, session); | |
382 | if (ret) | |
383 | return ret; | |
384 | } | |
385 | return 0; | |
386 | } | |
387 | ||
710b8ee3 MD |
388 | /* |
389 | * Ensure that a state-dump will be performed for this session at the end | |
390 | * of the current handle_message(). | |
391 | */ | |
392 | int lttng_session_statedump(struct lttng_session *session) | |
393 | { | |
394 | session->statedump_pending = 1; | |
395 | lttng_ust_sockinfo_session_enabled(session->owner); | |
396 | return 0; | |
397 | } | |
53569322 | 398 | |
7dd08bec | 399 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
400 | { |
401 | int ret = 0; | |
7dd08bec | 402 | struct lttng_channel *chan; |
32ce8569 | 403 | int notify_socket; |
8020ceb5 | 404 | |
8020ceb5 MD |
405 | if (session->active) { |
406 | ret = -EBUSY; | |
407 | goto end; | |
408 | } | |
409 | ||
32ce8569 MD |
410 | notify_socket = lttng_get_notify_socket(session->owner); |
411 | if (notify_socket < 0) | |
412 | return notify_socket; | |
413 | ||
ac6b4ac6 MD |
414 | /* Set transient enabler state to "enabled" */ |
415 | session->tstate = 1; | |
e58095ef | 416 | |
8020ceb5 MD |
417 | /* |
418 | * Snapshot the number of events per channel to know the type of header | |
419 | * we need to use. | |
420 | */ | |
e58095ef | 421 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 422 | const struct lttng_ctx *ctx; |
83e43212 | 423 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 424 | size_t nr_fields = 0; |
6ca18e66 | 425 | uint32_t chan_id; |
32ce8569 MD |
426 | |
427 | /* don't change it if session stop/restart */ | |
8020ceb5 | 428 | if (chan->header_type) |
32ce8569 MD |
429 | continue; |
430 | ctx = chan->ctx; | |
431 | if (ctx) { | |
432 | nr_fields = ctx->nr_fields; | |
83e43212 | 433 | fields = ctx->fields; |
53569322 MD |
434 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
435 | session); | |
436 | if (ret < 0) { | |
437 | DBG("Error (%d) adding enum to session", ret); | |
438 | return ret; | |
439 | } | |
32ce8569 MD |
440 | } |
441 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 442 | session, |
32ce8569 MD |
443 | session->objd, |
444 | chan->objd, | |
445 | nr_fields, | |
446 | fields, | |
6ca18e66 | 447 | &chan_id, |
32ce8569 | 448 | &chan->header_type); |
b869b5ae MD |
449 | if (ret) { |
450 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 451 | return ret; |
b869b5ae | 452 | } |
6ca18e66 MD |
453 | if (chan_id != chan->id) { |
454 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
455 | chan_id, chan->id); | |
456 | return -EINVAL; | |
457 | } | |
8020ceb5 MD |
458 | } |
459 | ||
5c055275 FD |
460 | /* We need to sync enablers with session before activation. */ |
461 | lttng_session_sync_enablers(session); | |
462 | ||
ac6b4ac6 | 463 | /* Set atomically the state to "active" */ |
b5234c06 MD |
464 | CMM_ACCESS_ONCE(session->active) = 1; |
465 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 466 | |
710b8ee3 MD |
467 | ret = lttng_session_statedump(session); |
468 | if (ret) | |
469 | return ret; | |
8020ceb5 | 470 | end: |
8020ceb5 MD |
471 | return ret; |
472 | } | |
473 | ||
7dd08bec | 474 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
475 | { |
476 | int ret = 0; | |
477 | ||
8020ceb5 MD |
478 | if (!session->active) { |
479 | ret = -EBUSY; | |
480 | goto end; | |
481 | } | |
ac6b4ac6 | 482 | /* Set atomically the state to "inactive" */ |
b5234c06 | 483 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
484 | |
485 | /* Set transient enabler state to "disabled" */ | |
486 | session->tstate = 0; | |
487 | lttng_session_sync_enablers(session); | |
8020ceb5 | 488 | end: |
8020ceb5 MD |
489 | return ret; |
490 | } | |
491 | ||
7dd08bec | 492 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 493 | { |
ac6b4ac6 | 494 | int ret = 0; |
976fe9ea | 495 | |
ac6b4ac6 MD |
496 | if (channel->enabled) { |
497 | ret = -EBUSY; | |
498 | goto end; | |
499 | } | |
500 | /* Set transient enabler state to "enabled" */ | |
501 | channel->tstate = 1; | |
502 | lttng_session_sync_enablers(channel->session); | |
503 | /* Set atomically the state to "enabled" */ | |
504 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
505 | end: | |
506 | return ret; | |
976fe9ea MD |
507 | } |
508 | ||
7dd08bec | 509 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 510 | { |
ac6b4ac6 | 511 | int ret = 0; |
976fe9ea | 512 | |
ac6b4ac6 MD |
513 | if (!channel->enabled) { |
514 | ret = -EBUSY; | |
515 | goto end; | |
516 | } | |
517 | /* Set atomically the state to "disabled" */ | |
518 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
519 | /* Set transient enabler state to "enabled" */ | |
520 | channel->tstate = 0; | |
521 | lttng_session_sync_enablers(channel->session); | |
522 | end: | |
523 | return ret; | |
976fe9ea MD |
524 | } |
525 | ||
8020ceb5 MD |
526 | /* |
527 | * Supports event creation while tracing session is active. | |
528 | */ | |
e58095ef MD |
529 | static |
530 | int lttng_event_create(const struct lttng_event_desc *desc, | |
531 | struct lttng_channel *chan) | |
8020ceb5 | 532 | { |
e58095ef | 533 | const char *event_name = desc->name; |
7dd08bec | 534 | struct lttng_event *event; |
32ce8569 | 535 | struct lttng_session *session = chan->session; |
d56fa719 MD |
536 | struct cds_hlist_head *head; |
537 | struct cds_hlist_node *node; | |
576599a0 | 538 | int ret = 0; |
d56fa719 MD |
539 | size_t name_len = strlen(event_name); |
540 | uint32_t hash; | |
32ce8569 MD |
541 | int notify_socket, loglevel; |
542 | const char *uri; | |
8020ceb5 | 543 | |
d56fa719 MD |
544 | hash = jhash(event_name, name_len, 0); |
545 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
546 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef | 547 | assert(event->desc); |
d970f72e MD |
548 | if (!strncmp(event->desc->name, desc->name, |
549 | LTTNG_UST_SYM_NAME_LEN - 1) | |
550 | && chan == event->chan) { | |
576599a0 | 551 | ret = -EEXIST; |
8020ceb5 | 552 | goto exist; |
576599a0 MD |
553 | } |
554 | } | |
457a6b58 | 555 | |
32ce8569 MD |
556 | notify_socket = lttng_get_notify_socket(session->owner); |
557 | if (notify_socket < 0) { | |
558 | ret = notify_socket; | |
559 | goto socket_error; | |
560 | } | |
561 | ||
53569322 MD |
562 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
563 | session); | |
c785c634 MD |
564 | if (ret < 0) { |
565 | DBG("Error (%d) adding enum to session", ret); | |
566 | goto create_enum_error; | |
567 | } | |
568 | ||
457a6b58 MD |
569 | /* |
570 | * Check if loglevel match. Refuse to connect event if not. | |
571 | */ | |
7dd08bec | 572 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
573 | if (!event) { |
574 | ret = -ENOMEM; | |
8020ceb5 | 575 | goto cache_error; |
576599a0 | 576 | } |
8020ceb5 | 577 | event->chan = chan; |
e58095ef | 578 | |
ac6b4ac6 MD |
579 | /* Event will be enabled by enabler sync. */ |
580 | event->enabled = 0; | |
581 | event->registered = 0; | |
e58095ef MD |
582 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
583 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
584 | event->desc = desc; | |
32ce8569 MD |
585 | |
586 | if (desc->loglevel) | |
587 | loglevel = *(*event->desc->loglevel); | |
588 | else | |
589 | loglevel = TRACE_DEFAULT; | |
590 | if (desc->u.ext.model_emf_uri) | |
591 | uri = *(desc->u.ext.model_emf_uri); | |
592 | else | |
593 | uri = NULL; | |
594 | ||
13b21cd6 MD |
595 | /* Fetch event ID from sessiond */ |
596 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 597 | session, |
13b21cd6 MD |
598 | session->objd, |
599 | chan->objd, | |
600 | event_name, | |
601 | loglevel, | |
602 | desc->signature, | |
603 | desc->nr_fields, | |
604 | desc->fields, | |
605 | uri, | |
606 | &event->id); | |
607 | if (ret < 0) { | |
608 | DBG("Error (%d) registering event to sessiond", ret); | |
609 | goto sessiond_register_error; | |
32ce8569 | 610 | } |
2b213b16 | 611 | |
7dd08bec | 612 | /* Populate lttng_event structure before tracepoint registration. */ |
b5234c06 | 613 | cmm_smp_wmb(); |
e58095ef | 614 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 615 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 616 | return 0; |
8020ceb5 | 617 | |
32ce8569 | 618 | sessiond_register_error: |
b5234c06 | 619 | free(event); |
8020ceb5 | 620 | cache_error: |
c785c634 | 621 | create_enum_error: |
32ce8569 | 622 | socket_error: |
8020ceb5 | 623 | exist: |
576599a0 | 624 | return ret; |
8020ceb5 MD |
625 | } |
626 | ||
e58095ef MD |
627 | static |
628 | int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, | |
629 | struct lttng_enabler *enabler) | |
630 | { | |
631 | int loglevel = 0; | |
7e2e405c | 632 | unsigned int has_loglevel = 0; |
e58095ef MD |
633 | |
634 | assert(enabler->type == LTTNG_ENABLER_WILDCARD); | |
635 | /* Compare excluding final '*' */ | |
636 | if (strncmp(desc->name, enabler->event_param.name, | |
637 | strlen(enabler->event_param.name) - 1)) | |
638 | return 0; | |
639 | if (desc->loglevel) { | |
640 | loglevel = *(*desc->loglevel); | |
641 | has_loglevel = 1; | |
642 | } | |
643 | if (!lttng_loglevel_match(loglevel, | |
644 | has_loglevel, | |
645 | enabler->event_param.loglevel_type, | |
646 | enabler->event_param.loglevel)) | |
647 | return 0; | |
648 | return 1; | |
649 | } | |
650 | ||
651 | static | |
652 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
653 | struct lttng_enabler *enabler) | |
654 | { | |
655 | int loglevel = 0; | |
656 | unsigned int has_loglevel = 0; | |
657 | ||
658 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
659 | if (strcmp(desc->name, enabler->event_param.name)) | |
660 | return 0; | |
661 | if (desc->loglevel) { | |
662 | loglevel = *(*desc->loglevel); | |
663 | has_loglevel = 1; | |
664 | } | |
665 | if (!lttng_loglevel_match(loglevel, | |
666 | has_loglevel, | |
667 | enabler->event_param.loglevel_type, | |
668 | enabler->event_param.loglevel)) | |
669 | return 0; | |
670 | return 1; | |
671 | } | |
672 | ||
673 | static | |
674 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
675 | struct lttng_enabler *enabler) | |
676 | { | |
ed5b5bbd JI |
677 | struct lttng_ust_excluder_node *excluder; |
678 | ||
679 | /* If event matches with an excluder, return 'does not match' */ | |
680 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
681 | int count; | |
682 | ||
683 | for (count = 0; count < excluder->excluder.count; count++) { | |
684 | int found, len; | |
685 | char *excluder_name; | |
686 | ||
687 | excluder_name = (char *) (excluder->excluder.names) | |
688 | + count * LTTNG_UST_SYM_NAME_LEN; | |
689 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
690 | if (len > 0 && excluder_name[len - 1] == '*') { | |
691 | found = !strncmp(desc->name, excluder_name, | |
692 | len - 1); | |
693 | } else { | |
694 | found = !strncmp(desc->name, excluder_name, | |
695 | LTTNG_UST_SYM_NAME_LEN - 1); | |
696 | } | |
697 | if (found) { | |
698 | return 0; | |
699 | } | |
700 | } | |
701 | } | |
e58095ef MD |
702 | switch (enabler->type) { |
703 | case LTTNG_ENABLER_WILDCARD: | |
704 | return lttng_desc_match_wildcard_enabler(desc, enabler); | |
705 | case LTTNG_ENABLER_EVENT: | |
706 | return lttng_desc_match_event_enabler(desc, enabler); | |
707 | default: | |
708 | return -EINVAL; | |
709 | } | |
710 | } | |
711 | ||
712 | static | |
713 | int lttng_event_match_enabler(struct lttng_event *event, | |
714 | struct lttng_enabler *enabler) | |
715 | { | |
d970f72e MD |
716 | if (lttng_desc_match_enabler(event->desc, enabler) |
717 | && event->chan == enabler->chan) | |
718 | return 1; | |
719 | else | |
720 | return 0; | |
e58095ef MD |
721 | } |
722 | ||
723 | static | |
724 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
725 | struct lttng_enabler *enabler) | |
726 | { | |
727 | struct lttng_enabler_ref *enabler_ref; | |
728 | ||
729 | cds_list_for_each_entry(enabler_ref, | |
730 | &event->enablers_ref_head, node) { | |
731 | if (enabler_ref->ref == enabler) | |
732 | return enabler_ref; | |
733 | } | |
734 | return NULL; | |
735 | } | |
736 | ||
8020ceb5 | 737 | /* |
e58095ef MD |
738 | * Create struct lttng_event if it is missing and present in the list of |
739 | * tracepoint probes. | |
8020ceb5 | 740 | */ |
e58095ef MD |
741 | static |
742 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 743 | { |
e58095ef MD |
744 | struct lttng_session *session = enabler->chan->session; |
745 | struct lttng_probe_desc *probe_desc; | |
746 | const struct lttng_event_desc *desc; | |
747 | struct lttng_event *event; | |
748 | int i; | |
749 | struct cds_list_head *probe_list; | |
750 | ||
751 | probe_list = lttng_get_probe_list_head(); | |
752 | /* | |
753 | * For each probe event, if we find that a probe event matches | |
754 | * our enabler, create an associated lttng_event if not | |
755 | * already present. | |
756 | */ | |
757 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
758 | for (i = 0; i < probe_desc->nr_events; i++) { | |
759 | int found = 0, ret; | |
d56fa719 MD |
760 | struct cds_hlist_head *head; |
761 | struct cds_hlist_node *node; | |
762 | const char *event_name; | |
763 | size_t name_len; | |
764 | uint32_t hash; | |
e58095ef MD |
765 | |
766 | desc = probe_desc->event_desc[i]; | |
767 | if (!lttng_desc_match_enabler(desc, enabler)) | |
768 | continue; | |
d56fa719 MD |
769 | event_name = desc->name; |
770 | name_len = strlen(event_name); | |
e58095ef MD |
771 | |
772 | /* | |
d56fa719 | 773 | * Check if already created. |
e58095ef | 774 | */ |
d56fa719 MD |
775 | hash = jhash(event_name, name_len, 0); |
776 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
777 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
d970f72e MD |
778 | if (event->desc == desc |
779 | && event->chan == enabler->chan) | |
e58095ef MD |
780 | found = 1; |
781 | } | |
782 | if (found) | |
783 | continue; | |
784 | ||
785 | /* | |
786 | * We need to create an event for this | |
787 | * event probe. | |
788 | */ | |
789 | ret = lttng_event_create(probe_desc->event_desc[i], | |
790 | enabler->chan); | |
791 | if (ret) { | |
32ce8569 MD |
792 | DBG("Unable to create event %s, error %d\n", |
793 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 794 | } |
8165c8da | 795 | } |
8020ceb5 | 796 | } |
8020ceb5 MD |
797 | } |
798 | ||
799 | /* | |
e58095ef MD |
800 | * Create events associated with an enabler (if not already present), |
801 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
802 | */ |
803 | static | |
e58095ef | 804 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 805 | { |
e58095ef MD |
806 | struct lttng_session *session = enabler->chan->session; |
807 | struct lttng_event *event; | |
808 | ||
809 | /* First ensure that probe events are created for this enabler. */ | |
810 | lttng_create_event_if_missing(enabler); | |
811 | ||
812 | /* For each event matching enabler in session event list. */ | |
813 | cds_list_for_each_entry(event, &session->events_head, node) { | |
814 | struct lttng_enabler_ref *enabler_ref; | |
815 | ||
816 | if (!lttng_event_match_enabler(event, enabler)) | |
817 | continue; | |
818 | ||
819 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
820 | if (!enabler_ref) { | |
821 | /* | |
822 | * If no backward ref, create it. | |
823 | * Add backward ref from event to enabler. | |
824 | */ | |
825 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
826 | if (!enabler_ref) | |
827 | return -ENOMEM; | |
828 | enabler_ref->ref = enabler; | |
829 | cds_list_add(&enabler_ref->node, | |
830 | &event->enablers_ref_head); | |
8165c8da | 831 | } |
e58095ef MD |
832 | |
833 | /* | |
834 | * Link filter bytecodes if not linked yet. | |
835 | */ | |
836 | lttng_enabler_event_link_bytecode(event, enabler); | |
837 | ||
838 | /* TODO: merge event context. */ | |
839 | } | |
840 | return 0; | |
841 | } | |
842 | ||
843 | /* | |
844 | * Called at library load: connect the probe on all enablers matching | |
845 | * this event. | |
5f733922 | 846 | * Called with session mutex held. |
e58095ef | 847 | */ |
5f733922 | 848 | int lttng_fix_pending_events(void) |
e58095ef MD |
849 | { |
850 | struct lttng_session *session; | |
851 | ||
852 | cds_list_for_each_entry(session, &sessions, node) { | |
853 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 854 | } |
e58095ef MD |
855 | return 0; |
856 | } | |
857 | ||
246be17e | 858 | /* |
37dddb65 MD |
859 | * For each session of the owner thread, execute pending statedump. |
860 | * Only dump state for the sessions owned by the caller thread, because | |
861 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 862 | */ |
3327ac33 | 863 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
864 | { |
865 | struct lttng_session *session; | |
866 | ||
37dddb65 | 867 | /* Execute state dump */ |
cf73e0fe | 868 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
869 | |
870 | /* Clear pending state dump */ | |
3327ac33 MD |
871 | if (ust_lock()) { |
872 | goto end; | |
873 | } | |
246be17e | 874 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
875 | if (session->owner != owner) |
876 | continue; | |
877 | if (!session->statedump_pending) | |
878 | continue; | |
879 | session->statedump_pending = 0; | |
246be17e | 880 | } |
3327ac33 | 881 | end: |
37dddb65 | 882 | ust_unlock(); |
3327ac33 | 883 | return; |
246be17e PW |
884 | } |
885 | ||
e58095ef MD |
886 | /* |
887 | * Only used internally at session destruction. | |
888 | */ | |
889 | static | |
890 | void _lttng_event_destroy(struct lttng_event *event) | |
891 | { | |
892 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
893 | ||
e58095ef | 894 | cds_list_del(&event->node); |
8020ceb5 | 895 | lttng_destroy_context(event->ctx); |
f488575f | 896 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
897 | /* Free event enabler refs */ |
898 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
899 | &event->enablers_ref_head, node) | |
900 | free(enabler_ref); | |
b5234c06 | 901 | free(event); |
8020ceb5 MD |
902 | } |
903 | ||
c785c634 MD |
904 | static |
905 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
906 | { | |
907 | cds_list_del(&_enum->node); | |
908 | free(_enum); | |
909 | } | |
910 | ||
003fedf4 | 911 | void lttng_ust_events_exit(void) |
8020ceb5 | 912 | { |
7dd08bec | 913 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 914 | |
e58095ef | 915 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 916 | lttng_session_destroy(session); |
8020ceb5 | 917 | } |
457a6b58 | 918 | |
e58095ef MD |
919 | /* |
920 | * Enabler management. | |
921 | */ | |
922 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
923 | struct lttng_ust_event *event_param, | |
924 | struct lttng_channel *chan) | |
457a6b58 | 925 | { |
e58095ef MD |
926 | struct lttng_enabler *enabler; |
927 | ||
928 | enabler = zmalloc(sizeof(*enabler)); | |
929 | if (!enabler) | |
930 | return NULL; | |
931 | enabler->type = type; | |
932 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
0f63324a | 933 | CDS_INIT_LIST_HEAD(&enabler->excluder_head); |
e58095ef MD |
934 | memcpy(&enabler->event_param, event_param, |
935 | sizeof(enabler->event_param)); | |
936 | enabler->chan = chan; | |
937 | /* ctx left NULL */ | |
89f26d57 | 938 | enabler->enabled = 0; |
e58095ef MD |
939 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); |
940 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
941 | return enabler; | |
457a6b58 MD |
942 | } |
943 | ||
e58095ef | 944 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 945 | { |
e58095ef MD |
946 | enabler->enabled = 1; |
947 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
948 | return 0; | |
457a6b58 | 949 | } |
457a6b58 | 950 | |
e58095ef | 951 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 952 | { |
e58095ef MD |
953 | enabler->enabled = 0; |
954 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
955 | return 0; | |
956 | } | |
457a6b58 | 957 | |
e58095ef MD |
958 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
959 | struct lttng_ust_filter_bytecode_node *bytecode) | |
960 | { | |
961 | bytecode->enabler = enabler; | |
962 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
963 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
964 | return 0; | |
0bfb5cbd JI |
965 | } |
966 | ||
967 | int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
968 | struct lttng_ust_excluder_node *excluder) | |
969 | { | |
970 | excluder->enabler = enabler; | |
971 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
972 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
973 | return 0; | |
e58095ef | 974 | } |
f488575f | 975 | |
e58095ef | 976 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 977 | union ust_args *uargs, |
e58095ef MD |
978 | struct lttng_ctx **ctx, struct lttng_session *session) |
979 | { | |
457a6b58 | 980 | /* |
e58095ef MD |
981 | * We cannot attach a context after trace has been started for a |
982 | * session because the metadata does not allow expressing this | |
983 | * information outside of the original channel scope. | |
457a6b58 | 984 | */ |
e58095ef MD |
985 | if (session->been_active) |
986 | return -EPERM; | |
457a6b58 | 987 | |
e58095ef MD |
988 | switch (context_param->ctx) { |
989 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
990 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
991 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
992 | { | |
993 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
994 | ||
995 | perf_ctx_param = &context_param->u.perf_counter; | |
996 | return lttng_add_perf_counter_to_ctx( | |
997 | perf_ctx_param->type, | |
998 | perf_ctx_param->config, | |
999 | perf_ctx_param->name, | |
1000 | ctx); | |
1001 | } | |
e58095ef MD |
1002 | case LTTNG_UST_CONTEXT_VTID: |
1003 | return lttng_add_vtid_to_ctx(ctx); | |
1004 | case LTTNG_UST_CONTEXT_VPID: | |
1005 | return lttng_add_vpid_to_ctx(ctx); | |
1006 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1007 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1008 | case LTTNG_UST_CONTEXT_IP: |
1009 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1010 | case LTTNG_UST_CONTEXT_CPU_ID: |
1011 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1012 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1013 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1014 | ctx); | |
e58095ef MD |
1015 | default: |
1016 | return -EINVAL; | |
457a6b58 | 1017 | } |
457a6b58 MD |
1018 | } |
1019 | ||
e58095ef MD |
1020 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1021 | struct lttng_ust_context *context_param) | |
457a6b58 | 1022 | { |
e58095ef MD |
1023 | #if 0 // disabled for now. |
1024 | struct lttng_session *session = enabler->chan->session; | |
1025 | int ret; | |
457a6b58 | 1026 | |
e58095ef MD |
1027 | ret = lttng_attach_context(context_param, &enabler->ctx, |
1028 | session); | |
1029 | if (ret) | |
1030 | return ret; | |
1031 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1032 | #endif | |
1033 | return -ENOSYS; | |
457a6b58 MD |
1034 | } |
1035 | ||
e58095ef MD |
1036 | static |
1037 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 1038 | { |
e58095ef | 1039 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
0f63324a | 1040 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
457a6b58 | 1041 | |
e58095ef MD |
1042 | /* Destroy filter bytecode */ |
1043 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1044 | &enabler->filter_bytecode_head, node) { | |
1045 | free(filter_node); | |
457a6b58 | 1046 | } |
e58095ef | 1047 | |
0f63324a JI |
1048 | /* Destroy excluders */ |
1049 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
1050 | &enabler->excluder_head, node) { | |
1051 | free(excluder_node); | |
1052 | } | |
1053 | ||
e58095ef MD |
1054 | /* Destroy contexts */ |
1055 | lttng_destroy_context(enabler->ctx); | |
1056 | ||
1057 | cds_list_del(&enabler->node); | |
1058 | free(enabler); | |
457a6b58 MD |
1059 | } |
1060 | ||
e58095ef MD |
1061 | /* |
1062 | * lttng_session_sync_enablers should be called just before starting a | |
1063 | * session. | |
1064 | */ | |
457a6b58 | 1065 | static |
e58095ef | 1066 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 1067 | { |
e58095ef MD |
1068 | struct lttng_enabler *enabler; |
1069 | struct lttng_event *event; | |
457a6b58 | 1070 | |
e58095ef MD |
1071 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
1072 | lttng_enabler_ref_events(enabler); | |
1073 | /* | |
1074 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1075 | * and its channel and session transient states are enabled, we |
1076 | * enable the event, else we disable it. | |
e58095ef MD |
1077 | */ |
1078 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1079 | struct lttng_enabler_ref *enabler_ref; | |
1080 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1081 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1082 | |
1083 | /* Enable events */ | |
1084 | cds_list_for_each_entry(enabler_ref, | |
1085 | &event->enablers_ref_head, node) { | |
1086 | if (enabler_ref->ref->enabled) { | |
1087 | enabled = 1; | |
1088 | break; | |
1089 | } | |
1090 | } | |
ac6b4ac6 MD |
1091 | /* |
1092 | * Enabled state is based on union of enablers, with | |
1093 | * intesection of session and channel transient enable | |
1094 | * states. | |
1095 | */ | |
1096 | enabled = enabled && session->tstate && event->chan->tstate; | |
1097 | ||
1098 | CMM_STORE_SHARED(event->enabled, enabled); | |
1099 | /* | |
1100 | * Sync tracepoint registration with event enabled | |
1101 | * state. | |
1102 | */ | |
1103 | if (enabled) { | |
1104 | if (!event->registered) | |
1105 | register_event(event); | |
1106 | } else { | |
1107 | if (event->registered) | |
1108 | unregister_event(event); | |
1109 | } | |
457a6b58 | 1110 | |
1f49fc05 | 1111 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1112 | cds_list_for_each_entry(enabler_ref, |
1113 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1114 | if (enabler_ref->ref->enabled |
1115 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1116 | has_enablers_without_bytecode = 1; |
1117 | break; | |
1118 | } | |
1119 | } | |
1120 | event->has_enablers_without_bytecode = | |
1121 | has_enablers_without_bytecode; | |
1122 | ||
e58095ef MD |
1123 | /* Enable filters */ |
1124 | cds_list_for_each_entry(runtime, | |
1125 | &event->bytecode_runtime_head, node) { | |
1126 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
1127 | } |
1128 | } | |
baa1e0bc | 1129 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1130 | } |
1131 | ||
e58095ef MD |
1132 | /* |
1133 | * Apply enablers to session events, adding events to session if need | |
1134 | * be. It is required after each modification applied to an active | |
1135 | * session, and right before session "start". | |
1136 | * "lazy" sync means we only sync if required. | |
1137 | */ | |
1138 | static | |
1139 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 1140 | { |
e58095ef MD |
1141 | /* We can skip if session is not active */ |
1142 | if (!session->active) | |
1143 | return; | |
1144 | lttng_session_sync_enablers(session); | |
457a6b58 | 1145 | } |
53569322 MD |
1146 | |
1147 | /* | |
1148 | * Update all sessions with the given app context. | |
1149 | * Called with ust lock held. | |
1150 | * This is invoked when an application context gets loaded/unloaded. It | |
1151 | * ensures the context callbacks are in sync with the application | |
1152 | * context (either app context callbacks, or dummy callbacks). | |
1153 | */ | |
1154 | void lttng_ust_context_set_session_provider(const char *name, | |
1155 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1156 | void (*record)(struct lttng_ctx_field *field, | |
1157 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1158 | struct lttng_channel *chan), | |
1159 | void (*get_value)(struct lttng_ctx_field *field, | |
1160 | struct lttng_ctx_value *value)) | |
1161 | { | |
1162 | struct lttng_session *session; | |
1163 | ||
1164 | cds_list_for_each_entry(session, &sessions, node) { | |
1165 | struct lttng_channel *chan; | |
1166 | struct lttng_event *event; | |
1167 | int ret; | |
1168 | ||
1169 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1170 | name, get_size, record, get_value); | |
1171 | if (ret) | |
1172 | abort(); | |
1173 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1174 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1175 | name, get_size, record, get_value); | |
1176 | if (ret) | |
1177 | abort(); | |
1178 | } | |
1179 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1180 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1181 | name, get_size, record, get_value); | |
1182 | if (ret) | |
1183 | abort(); | |
1184 | } | |
1185 | } | |
1186 | } |