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 | 23 | #define _GNU_SOURCE |
3fbec7dc | 24 | #define _LGPL_SOURCE |
b5234c06 MD |
25 | #include <stdio.h> |
26 | #include <urcu/list.h> | |
8165c8da | 27 | #include <urcu/hlist.h> |
b5234c06 | 28 | #include <pthread.h> |
b5234c06 | 29 | #include <errno.h> |
f4681817 MD |
30 | #include <sys/shm.h> |
31 | #include <sys/ipc.h> | |
44c72f10 MD |
32 | #include <stdint.h> |
33 | #include <stddef.h> | |
28b12049 MD |
34 | #include <inttypes.h> |
35 | #include <time.h> | |
2ae57758 | 36 | #include <lttng/ust-endian.h> |
28b12049 | 37 | #include "clock.h" |
44c72f10 MD |
38 | |
39 | #include <urcu-bp.h> | |
40 | #include <urcu/compiler.h> | |
41 | #include <urcu/uatomic.h> | |
42 | #include <urcu/arch.h> | |
43 | ||
44 | #include <lttng/tracepoint.h> | |
4318ae1b | 45 | #include <lttng/ust-events.h> |
44c72f10 MD |
46 | |
47 | #include <usterr-signal-safe.h> | |
48 | #include <helper.h> | |
7d3e35b6 | 49 | #include <lttng/ust-ctl.h> |
32ce8569 | 50 | #include <ust-comm.h> |
53569322 MD |
51 | #include <lttng/ust-dynamic-type.h> |
52 | #include <lttng/ust-context-provider.h> | |
1f18504e | 53 | #include "error.h" |
08114193 | 54 | #include "compat.h" |
eda498b8 | 55 | #include "lttng-ust-uuid.h" |
44c72f10 | 56 | |
457a6b58 | 57 | #include "tracepoint-internal.h" |
7dd08bec MD |
58 | #include "lttng-tracer.h" |
59 | #include "lttng-tracer-core.h" | |
cf73e0fe | 60 | #include "lttng-ust-statedump.h" |
b728d87e | 61 | #include "wait.h" |
8d8a24c8 | 62 | #include "../libringbuffer/shm.h" |
596c4223 | 63 | #include "jhash.h" |
8165c8da MD |
64 | |
65 | /* | |
3327ac33 MD |
66 | * All operations within this file are called by the communication |
67 | * thread, under ust_lock protection. | |
8165c8da | 68 | */ |
8165c8da | 69 | |
b5234c06 | 70 | static CDS_LIST_HEAD(sessions); |
8165c8da | 71 | |
37dddb65 MD |
72 | struct cds_list_head *_lttng_get_sessions(void) |
73 | { | |
74 | return &sessions; | |
75 | } | |
76 | ||
7dd08bec | 77 | static void _lttng_event_destroy(struct lttng_event *event); |
c785c634 | 78 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 79 | |
e58095ef MD |
80 | static |
81 | void lttng_session_lazy_sync_enablers(struct lttng_session *session); | |
82 | static | |
83 | void lttng_session_sync_enablers(struct lttng_session *session); | |
84 | static | |
85 | void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
86 | ||
6715d7d1 MD |
87 | /* |
88 | * Called with ust lock held. | |
89 | */ | |
90 | int lttng_session_active(void) | |
91 | { | |
92 | struct lttng_session *iter; | |
93 | ||
94 | cds_list_for_each_entry(iter, &sessions, node) { | |
95 | if (iter->active) | |
96 | return 1; | |
97 | } | |
98 | return 0; | |
99 | } | |
100 | ||
e58095ef MD |
101 | static |
102 | int lttng_loglevel_match(int loglevel, | |
103 | unsigned int has_loglevel, | |
457a6b58 MD |
104 | enum lttng_ust_loglevel_type req_type, |
105 | int req_loglevel) | |
106 | { | |
e58095ef MD |
107 | if (!has_loglevel) |
108 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
109 | switch (req_type) { |
110 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 111 | if (loglevel <= req_loglevel |
67ada458 | 112 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
113 | return 1; |
114 | else | |
115 | return 0; | |
116 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 117 | if (loglevel == req_loglevel |
67ada458 | 118 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
119 | return 1; |
120 | else | |
121 | return 0; | |
122 | case LTTNG_UST_LOGLEVEL_ALL: | |
123 | default: | |
67ada458 | 124 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
125 | return 1; |
126 | else | |
127 | return 0; | |
457a6b58 MD |
128 | } |
129 | } | |
130 | ||
8020ceb5 MD |
131 | void synchronize_trace(void) |
132 | { | |
8020ceb5 | 133 | synchronize_rcu(); |
8020ceb5 MD |
134 | } |
135 | ||
7dd08bec | 136 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 137 | { |
7dd08bec | 138 | struct lttng_session *session; |
74d81a6c | 139 | int i; |
8020ceb5 | 140 | |
7dd08bec | 141 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
142 | if (!session) |
143 | return NULL; | |
53569322 MD |
144 | if (lttng_session_context_init(&session->ctx)) { |
145 | free(session); | |
146 | return NULL; | |
147 | } | |
e58095ef MD |
148 | CDS_INIT_LIST_HEAD(&session->chan_head); |
149 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 150 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 151 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
152 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
153 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
154 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
155 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 156 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
157 | return session; |
158 | } | |
159 | ||
74d81a6c MD |
160 | /* |
161 | * Only used internally at session destruction. | |
162 | */ | |
163 | static | |
164 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
165 | { | |
166 | struct channel *chan; | |
167 | struct lttng_ust_shm_handle *handle; | |
168 | ||
169 | cds_list_del(<tng_chan->node); | |
170 | lttng_destroy_context(lttng_chan->ctx); | |
171 | chan = lttng_chan->chan; | |
172 | handle = lttng_chan->handle; | |
173 | /* | |
174 | * note: lttng_chan is private data contained within handle. It | |
175 | * will be freed along with the handle. | |
176 | */ | |
177 | channel_destroy(chan, handle, 0); | |
178 | } | |
179 | ||
ac6b4ac6 MD |
180 | static |
181 | void register_event(struct lttng_event *event) | |
182 | { | |
183 | int ret; | |
184 | const struct lttng_event_desc *desc; | |
185 | ||
186 | assert(event->registered == 0); | |
187 | desc = event->desc; | |
baa1e0bc | 188 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
189 | desc->probe_callback, |
190 | event, desc->signature); | |
191 | WARN_ON_ONCE(ret); | |
192 | if (!ret) | |
193 | event->registered = 1; | |
194 | } | |
195 | ||
196 | static | |
197 | void unregister_event(struct lttng_event *event) | |
198 | { | |
199 | int ret; | |
200 | const struct lttng_event_desc *desc; | |
201 | ||
202 | assert(event->registered == 1); | |
203 | desc = event->desc; | |
baa1e0bc | 204 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
205 | desc->probe_callback, |
206 | event); | |
207 | WARN_ON_ONCE(ret); | |
208 | if (!ret) | |
209 | event->registered = 0; | |
210 | } | |
211 | ||
212 | /* | |
213 | * Only used internally at session destruction. | |
214 | */ | |
215 | static | |
216 | void _lttng_event_unregister(struct lttng_event *event) | |
217 | { | |
218 | if (event->registered) | |
219 | unregister_event(event); | |
220 | } | |
221 | ||
7dd08bec | 222 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 223 | { |
7dd08bec MD |
224 | struct lttng_channel *chan, *tmpchan; |
225 | struct lttng_event *event, *tmpevent; | |
c785c634 | 226 | struct lttng_enum *_enum, *tmp_enum; |
e58095ef | 227 | struct lttng_enabler *enabler, *tmpenabler; |
8020ceb5 | 228 | |
b5234c06 | 229 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 230 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 231 | _lttng_event_unregister(event); |
8020ceb5 MD |
232 | } |
233 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
baa1e0bc | 234 | __tracepoint_probe_prune_release_queue(); |
e58095ef MD |
235 | cds_list_for_each_entry_safe(enabler, tmpenabler, |
236 | &session->enablers_head, node) | |
237 | lttng_enabler_destroy(enabler); | |
238 | cds_list_for_each_entry_safe(event, tmpevent, | |
239 | &session->events_head, node) | |
7dd08bec | 240 | _lttng_event_destroy(event); |
c785c634 MD |
241 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
242 | &session->enums_head, node) | |
243 | _lttng_enum_destroy(_enum); | |
e58095ef | 244 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 245 | _lttng_channel_unmap(chan); |
e58095ef | 246 | cds_list_del(&session->node); |
53569322 | 247 | lttng_destroy_context(session->ctx); |
b5234c06 | 248 | free(session); |
8020ceb5 MD |
249 | } |
250 | ||
53569322 MD |
251 | static |
252 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
253 | struct lttng_session *session) | |
254 | { | |
255 | const char *enum_name = desc->name; | |
256 | struct lttng_enum *_enum; | |
257 | struct cds_hlist_head *head; | |
258 | struct cds_hlist_node *node; | |
259 | int ret = 0; | |
260 | size_t name_len = strlen(enum_name); | |
261 | uint32_t hash; | |
262 | int notify_socket; | |
263 | ||
264 | hash = jhash(enum_name, name_len, 0); | |
265 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
266 | cds_hlist_for_each_entry(_enum, node, head, hlist) { | |
267 | assert(_enum->desc); | |
268 | if (!strncmp(_enum->desc->name, desc->name, | |
269 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
270 | ret = -EEXIST; | |
271 | goto exist; | |
272 | } | |
273 | } | |
274 | ||
275 | notify_socket = lttng_get_notify_socket(session->owner); | |
276 | if (notify_socket < 0) { | |
277 | ret = notify_socket; | |
278 | goto socket_error; | |
279 | } | |
280 | ||
281 | _enum = zmalloc(sizeof(*_enum)); | |
282 | if (!_enum) { | |
283 | ret = -ENOMEM; | |
284 | goto cache_error; | |
285 | } | |
286 | _enum->session = session; | |
287 | _enum->desc = desc; | |
288 | ||
289 | ret = ustcomm_register_enum(notify_socket, | |
290 | session->objd, | |
291 | enum_name, | |
292 | desc->nr_entries, | |
293 | desc->entries, | |
294 | &_enum->id); | |
295 | if (ret < 0) { | |
296 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
297 | goto sessiond_register_error; | |
298 | } | |
299 | cds_list_add(&_enum->node, &session->enums_head); | |
300 | cds_hlist_add_head(&_enum->hlist, head); | |
301 | return 0; | |
302 | ||
303 | sessiond_register_error: | |
304 | free(_enum); | |
305 | cache_error: | |
306 | socket_error: | |
307 | exist: | |
308 | return ret; | |
309 | } | |
310 | ||
311 | static | |
312 | int lttng_create_enum_check(const struct lttng_type *type, | |
313 | struct lttng_session *session) | |
314 | { | |
315 | switch (type->atype) { | |
316 | case atype_enum: | |
317 | { | |
318 | const struct lttng_enum_desc *enum_desc; | |
319 | int ret; | |
320 | ||
321 | enum_desc = type->u.basic.enumeration.desc; | |
322 | ret = lttng_enum_create(enum_desc, session); | |
323 | if (ret && ret != -EEXIST) { | |
324 | DBG("Unable to create enum error: (%d)", ret); | |
325 | return ret; | |
326 | } | |
327 | break; | |
328 | } | |
329 | case atype_dynamic: | |
330 | { | |
331 | const struct lttng_event_field *tag_field_generic; | |
332 | const struct lttng_enum_desc *enum_desc; | |
333 | int ret; | |
334 | ||
335 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
336 | enum_desc = tag_field_generic->type.u.basic.enumeration.desc; | |
337 | ret = lttng_enum_create(enum_desc, session); | |
338 | if (ret && ret != -EEXIST) { | |
339 | DBG("Unable to create enum error: (%d)", ret); | |
340 | return ret; | |
341 | } | |
342 | break; | |
343 | } | |
344 | default: | |
345 | /* TODO: nested types when they become supported. */ | |
346 | break; | |
347 | } | |
348 | return 0; | |
349 | } | |
350 | ||
351 | static | |
352 | int lttng_create_all_event_enums(size_t nr_fields, | |
353 | const struct lttng_event_field *event_fields, | |
354 | struct lttng_session *session) | |
355 | { | |
356 | size_t i; | |
357 | int ret; | |
358 | ||
359 | /* For each field, ensure enum is part of the session. */ | |
360 | for (i = 0; i < nr_fields; i++) { | |
361 | const struct lttng_type *type = &event_fields[i].type; | |
362 | ||
363 | ret = lttng_create_enum_check(type, session); | |
364 | if (ret) | |
365 | return ret; | |
366 | } | |
367 | return 0; | |
368 | } | |
369 | ||
370 | static | |
371 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
372 | const struct lttng_ctx_field *ctx_fields, | |
373 | struct lttng_session *session) | |
374 | { | |
375 | size_t i; | |
376 | int ret; | |
377 | ||
378 | /* For each field, ensure enum is part of the session. */ | |
379 | for (i = 0; i < nr_fields; i++) { | |
380 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
381 | ||
382 | ret = lttng_create_enum_check(type, session); | |
383 | if (ret) | |
384 | return ret; | |
385 | } | |
386 | return 0; | |
387 | } | |
388 | ||
710b8ee3 MD |
389 | /* |
390 | * Ensure that a state-dump will be performed for this session at the end | |
391 | * of the current handle_message(). | |
392 | */ | |
393 | int lttng_session_statedump(struct lttng_session *session) | |
394 | { | |
395 | session->statedump_pending = 1; | |
396 | lttng_ust_sockinfo_session_enabled(session->owner); | |
397 | return 0; | |
398 | } | |
53569322 | 399 | |
7dd08bec | 400 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
401 | { |
402 | int ret = 0; | |
7dd08bec | 403 | struct lttng_channel *chan; |
32ce8569 | 404 | int notify_socket; |
8020ceb5 | 405 | |
8020ceb5 MD |
406 | if (session->active) { |
407 | ret = -EBUSY; | |
408 | goto end; | |
409 | } | |
410 | ||
32ce8569 MD |
411 | notify_socket = lttng_get_notify_socket(session->owner); |
412 | if (notify_socket < 0) | |
413 | return notify_socket; | |
414 | ||
ac6b4ac6 MD |
415 | /* Set transient enabler state to "enabled" */ |
416 | session->tstate = 1; | |
e58095ef | 417 | |
8020ceb5 MD |
418 | /* |
419 | * Snapshot the number of events per channel to know the type of header | |
420 | * we need to use. | |
421 | */ | |
e58095ef | 422 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 423 | const struct lttng_ctx *ctx; |
83e43212 | 424 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 425 | size_t nr_fields = 0; |
6ca18e66 | 426 | uint32_t chan_id; |
32ce8569 MD |
427 | |
428 | /* don't change it if session stop/restart */ | |
8020ceb5 | 429 | if (chan->header_type) |
32ce8569 MD |
430 | continue; |
431 | ctx = chan->ctx; | |
432 | if (ctx) { | |
433 | nr_fields = ctx->nr_fields; | |
83e43212 | 434 | fields = ctx->fields; |
53569322 MD |
435 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
436 | session); | |
437 | if (ret < 0) { | |
438 | DBG("Error (%d) adding enum to session", ret); | |
439 | return ret; | |
440 | } | |
32ce8569 MD |
441 | } |
442 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 443 | session, |
32ce8569 MD |
444 | session->objd, |
445 | chan->objd, | |
446 | nr_fields, | |
447 | fields, | |
6ca18e66 | 448 | &chan_id, |
32ce8569 | 449 | &chan->header_type); |
b869b5ae MD |
450 | if (ret) { |
451 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 452 | return ret; |
b869b5ae | 453 | } |
6ca18e66 MD |
454 | if (chan_id != chan->id) { |
455 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
456 | chan_id, chan->id); | |
457 | return -EINVAL; | |
458 | } | |
8020ceb5 MD |
459 | } |
460 | ||
5c055275 FD |
461 | /* We need to sync enablers with session before activation. */ |
462 | lttng_session_sync_enablers(session); | |
463 | ||
ac6b4ac6 | 464 | /* Set atomically the state to "active" */ |
b5234c06 MD |
465 | CMM_ACCESS_ONCE(session->active) = 1; |
466 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 467 | |
710b8ee3 MD |
468 | ret = lttng_session_statedump(session); |
469 | if (ret) | |
470 | return ret; | |
8020ceb5 | 471 | end: |
8020ceb5 MD |
472 | return ret; |
473 | } | |
474 | ||
7dd08bec | 475 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
476 | { |
477 | int ret = 0; | |
478 | ||
8020ceb5 MD |
479 | if (!session->active) { |
480 | ret = -EBUSY; | |
481 | goto end; | |
482 | } | |
ac6b4ac6 | 483 | /* Set atomically the state to "inactive" */ |
b5234c06 | 484 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
485 | |
486 | /* Set transient enabler state to "disabled" */ | |
487 | session->tstate = 0; | |
488 | lttng_session_sync_enablers(session); | |
8020ceb5 | 489 | end: |
8020ceb5 MD |
490 | return ret; |
491 | } | |
492 | ||
7dd08bec | 493 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 494 | { |
ac6b4ac6 | 495 | int ret = 0; |
976fe9ea | 496 | |
ac6b4ac6 MD |
497 | if (channel->enabled) { |
498 | ret = -EBUSY; | |
499 | goto end; | |
500 | } | |
501 | /* Set transient enabler state to "enabled" */ | |
502 | channel->tstate = 1; | |
503 | lttng_session_sync_enablers(channel->session); | |
504 | /* Set atomically the state to "enabled" */ | |
505 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
506 | end: | |
507 | return ret; | |
976fe9ea MD |
508 | } |
509 | ||
7dd08bec | 510 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 511 | { |
ac6b4ac6 | 512 | int ret = 0; |
976fe9ea | 513 | |
ac6b4ac6 MD |
514 | if (!channel->enabled) { |
515 | ret = -EBUSY; | |
516 | goto end; | |
517 | } | |
518 | /* Set atomically the state to "disabled" */ | |
519 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
520 | /* Set transient enabler state to "enabled" */ | |
521 | channel->tstate = 0; | |
522 | lttng_session_sync_enablers(channel->session); | |
523 | end: | |
524 | return ret; | |
976fe9ea MD |
525 | } |
526 | ||
8020ceb5 MD |
527 | /* |
528 | * Supports event creation while tracing session is active. | |
529 | */ | |
e58095ef MD |
530 | static |
531 | int lttng_event_create(const struct lttng_event_desc *desc, | |
532 | struct lttng_channel *chan) | |
8020ceb5 | 533 | { |
e58095ef | 534 | const char *event_name = desc->name; |
7dd08bec | 535 | struct lttng_event *event; |
32ce8569 | 536 | struct lttng_session *session = chan->session; |
d56fa719 MD |
537 | struct cds_hlist_head *head; |
538 | struct cds_hlist_node *node; | |
576599a0 | 539 | int ret = 0; |
d56fa719 MD |
540 | size_t name_len = strlen(event_name); |
541 | uint32_t hash; | |
32ce8569 MD |
542 | int notify_socket, loglevel; |
543 | const char *uri; | |
8020ceb5 | 544 | |
d56fa719 MD |
545 | hash = jhash(event_name, name_len, 0); |
546 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
547 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef | 548 | assert(event->desc); |
d970f72e MD |
549 | if (!strncmp(event->desc->name, desc->name, |
550 | LTTNG_UST_SYM_NAME_LEN - 1) | |
551 | && chan == event->chan) { | |
576599a0 | 552 | ret = -EEXIST; |
8020ceb5 | 553 | goto exist; |
576599a0 MD |
554 | } |
555 | } | |
457a6b58 | 556 | |
32ce8569 MD |
557 | notify_socket = lttng_get_notify_socket(session->owner); |
558 | if (notify_socket < 0) { | |
559 | ret = notify_socket; | |
560 | goto socket_error; | |
561 | } | |
562 | ||
53569322 MD |
563 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
564 | session); | |
c785c634 MD |
565 | if (ret < 0) { |
566 | DBG("Error (%d) adding enum to session", ret); | |
567 | goto create_enum_error; | |
568 | } | |
569 | ||
457a6b58 MD |
570 | /* |
571 | * Check if loglevel match. Refuse to connect event if not. | |
572 | */ | |
7dd08bec | 573 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
574 | if (!event) { |
575 | ret = -ENOMEM; | |
8020ceb5 | 576 | goto cache_error; |
576599a0 | 577 | } |
8020ceb5 | 578 | event->chan = chan; |
e58095ef | 579 | |
ac6b4ac6 MD |
580 | /* Event will be enabled by enabler sync. */ |
581 | event->enabled = 0; | |
582 | event->registered = 0; | |
e58095ef MD |
583 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
584 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
585 | event->desc = desc; | |
32ce8569 MD |
586 | |
587 | if (desc->loglevel) | |
588 | loglevel = *(*event->desc->loglevel); | |
589 | else | |
590 | loglevel = TRACE_DEFAULT; | |
591 | if (desc->u.ext.model_emf_uri) | |
592 | uri = *(desc->u.ext.model_emf_uri); | |
593 | else | |
594 | uri = NULL; | |
595 | ||
13b21cd6 MD |
596 | /* Fetch event ID from sessiond */ |
597 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 598 | session, |
13b21cd6 MD |
599 | session->objd, |
600 | chan->objd, | |
601 | event_name, | |
602 | loglevel, | |
603 | desc->signature, | |
604 | desc->nr_fields, | |
605 | desc->fields, | |
606 | uri, | |
607 | &event->id); | |
608 | if (ret < 0) { | |
609 | DBG("Error (%d) registering event to sessiond", ret); | |
610 | goto sessiond_register_error; | |
32ce8569 | 611 | } |
2b213b16 | 612 | |
7dd08bec | 613 | /* Populate lttng_event structure before tracepoint registration. */ |
b5234c06 | 614 | cmm_smp_wmb(); |
e58095ef | 615 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 616 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 617 | return 0; |
8020ceb5 | 618 | |
32ce8569 | 619 | sessiond_register_error: |
b5234c06 | 620 | free(event); |
8020ceb5 | 621 | cache_error: |
c785c634 | 622 | create_enum_error: |
32ce8569 | 623 | socket_error: |
8020ceb5 | 624 | exist: |
576599a0 | 625 | return ret; |
8020ceb5 MD |
626 | } |
627 | ||
e58095ef MD |
628 | static |
629 | int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, | |
630 | struct lttng_enabler *enabler) | |
631 | { | |
632 | int loglevel = 0; | |
7e2e405c | 633 | unsigned int has_loglevel = 0; |
e58095ef MD |
634 | |
635 | assert(enabler->type == LTTNG_ENABLER_WILDCARD); | |
636 | /* Compare excluding final '*' */ | |
637 | if (strncmp(desc->name, enabler->event_param.name, | |
638 | strlen(enabler->event_param.name) - 1)) | |
639 | return 0; | |
640 | if (desc->loglevel) { | |
641 | loglevel = *(*desc->loglevel); | |
642 | has_loglevel = 1; | |
643 | } | |
644 | if (!lttng_loglevel_match(loglevel, | |
645 | has_loglevel, | |
646 | enabler->event_param.loglevel_type, | |
647 | enabler->event_param.loglevel)) | |
648 | return 0; | |
649 | return 1; | |
650 | } | |
651 | ||
652 | static | |
653 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
654 | struct lttng_enabler *enabler) | |
655 | { | |
656 | int loglevel = 0; | |
657 | unsigned int has_loglevel = 0; | |
658 | ||
659 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
660 | if (strcmp(desc->name, enabler->event_param.name)) | |
661 | return 0; | |
662 | if (desc->loglevel) { | |
663 | loglevel = *(*desc->loglevel); | |
664 | has_loglevel = 1; | |
665 | } | |
666 | if (!lttng_loglevel_match(loglevel, | |
667 | has_loglevel, | |
668 | enabler->event_param.loglevel_type, | |
669 | enabler->event_param.loglevel)) | |
670 | return 0; | |
671 | return 1; | |
672 | } | |
673 | ||
674 | static | |
675 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
676 | struct lttng_enabler *enabler) | |
677 | { | |
ed5b5bbd JI |
678 | struct lttng_ust_excluder_node *excluder; |
679 | ||
680 | /* If event matches with an excluder, return 'does not match' */ | |
681 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
682 | int count; | |
683 | ||
684 | for (count = 0; count < excluder->excluder.count; count++) { | |
685 | int found, len; | |
686 | char *excluder_name; | |
687 | ||
688 | excluder_name = (char *) (excluder->excluder.names) | |
689 | + count * LTTNG_UST_SYM_NAME_LEN; | |
690 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
691 | if (len > 0 && excluder_name[len - 1] == '*') { | |
692 | found = !strncmp(desc->name, excluder_name, | |
693 | len - 1); | |
694 | } else { | |
695 | found = !strncmp(desc->name, excluder_name, | |
696 | LTTNG_UST_SYM_NAME_LEN - 1); | |
697 | } | |
698 | if (found) { | |
699 | return 0; | |
700 | } | |
701 | } | |
702 | } | |
e58095ef MD |
703 | switch (enabler->type) { |
704 | case LTTNG_ENABLER_WILDCARD: | |
705 | return lttng_desc_match_wildcard_enabler(desc, enabler); | |
706 | case LTTNG_ENABLER_EVENT: | |
707 | return lttng_desc_match_event_enabler(desc, enabler); | |
708 | default: | |
709 | return -EINVAL; | |
710 | } | |
711 | } | |
712 | ||
713 | static | |
714 | int lttng_event_match_enabler(struct lttng_event *event, | |
715 | struct lttng_enabler *enabler) | |
716 | { | |
d970f72e MD |
717 | if (lttng_desc_match_enabler(event->desc, enabler) |
718 | && event->chan == enabler->chan) | |
719 | return 1; | |
720 | else | |
721 | return 0; | |
e58095ef MD |
722 | } |
723 | ||
724 | static | |
725 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
726 | struct lttng_enabler *enabler) | |
727 | { | |
728 | struct lttng_enabler_ref *enabler_ref; | |
729 | ||
730 | cds_list_for_each_entry(enabler_ref, | |
731 | &event->enablers_ref_head, node) { | |
732 | if (enabler_ref->ref == enabler) | |
733 | return enabler_ref; | |
734 | } | |
735 | return NULL; | |
736 | } | |
737 | ||
8020ceb5 | 738 | /* |
e58095ef MD |
739 | * Create struct lttng_event if it is missing and present in the list of |
740 | * tracepoint probes. | |
8020ceb5 | 741 | */ |
e58095ef MD |
742 | static |
743 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 744 | { |
e58095ef MD |
745 | struct lttng_session *session = enabler->chan->session; |
746 | struct lttng_probe_desc *probe_desc; | |
747 | const struct lttng_event_desc *desc; | |
748 | struct lttng_event *event; | |
749 | int i; | |
750 | struct cds_list_head *probe_list; | |
751 | ||
752 | probe_list = lttng_get_probe_list_head(); | |
753 | /* | |
754 | * For each probe event, if we find that a probe event matches | |
755 | * our enabler, create an associated lttng_event if not | |
756 | * already present. | |
757 | */ | |
758 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
759 | for (i = 0; i < probe_desc->nr_events; i++) { | |
760 | int found = 0, ret; | |
d56fa719 MD |
761 | struct cds_hlist_head *head; |
762 | struct cds_hlist_node *node; | |
763 | const char *event_name; | |
764 | size_t name_len; | |
765 | uint32_t hash; | |
e58095ef MD |
766 | |
767 | desc = probe_desc->event_desc[i]; | |
768 | if (!lttng_desc_match_enabler(desc, enabler)) | |
769 | continue; | |
d56fa719 MD |
770 | event_name = desc->name; |
771 | name_len = strlen(event_name); | |
e58095ef MD |
772 | |
773 | /* | |
d56fa719 | 774 | * Check if already created. |
e58095ef | 775 | */ |
d56fa719 MD |
776 | hash = jhash(event_name, name_len, 0); |
777 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
778 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
d970f72e MD |
779 | if (event->desc == desc |
780 | && event->chan == enabler->chan) | |
e58095ef MD |
781 | found = 1; |
782 | } | |
783 | if (found) | |
784 | continue; | |
785 | ||
786 | /* | |
787 | * We need to create an event for this | |
788 | * event probe. | |
789 | */ | |
790 | ret = lttng_event_create(probe_desc->event_desc[i], | |
791 | enabler->chan); | |
792 | if (ret) { | |
32ce8569 MD |
793 | DBG("Unable to create event %s, error %d\n", |
794 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 795 | } |
8165c8da | 796 | } |
8020ceb5 | 797 | } |
8020ceb5 MD |
798 | } |
799 | ||
800 | /* | |
e58095ef MD |
801 | * Create events associated with an enabler (if not already present), |
802 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
803 | */ |
804 | static | |
e58095ef | 805 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 806 | { |
e58095ef MD |
807 | struct lttng_session *session = enabler->chan->session; |
808 | struct lttng_event *event; | |
809 | ||
810 | /* First ensure that probe events are created for this enabler. */ | |
811 | lttng_create_event_if_missing(enabler); | |
812 | ||
813 | /* For each event matching enabler in session event list. */ | |
814 | cds_list_for_each_entry(event, &session->events_head, node) { | |
815 | struct lttng_enabler_ref *enabler_ref; | |
816 | ||
817 | if (!lttng_event_match_enabler(event, enabler)) | |
818 | continue; | |
819 | ||
820 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
821 | if (!enabler_ref) { | |
822 | /* | |
823 | * If no backward ref, create it. | |
824 | * Add backward ref from event to enabler. | |
825 | */ | |
826 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
827 | if (!enabler_ref) | |
828 | return -ENOMEM; | |
829 | enabler_ref->ref = enabler; | |
830 | cds_list_add(&enabler_ref->node, | |
831 | &event->enablers_ref_head); | |
8165c8da | 832 | } |
e58095ef MD |
833 | |
834 | /* | |
835 | * Link filter bytecodes if not linked yet. | |
836 | */ | |
837 | lttng_enabler_event_link_bytecode(event, enabler); | |
838 | ||
839 | /* TODO: merge event context. */ | |
840 | } | |
841 | return 0; | |
842 | } | |
843 | ||
844 | /* | |
845 | * Called at library load: connect the probe on all enablers matching | |
846 | * this event. | |
5f733922 | 847 | * Called with session mutex held. |
e58095ef | 848 | */ |
5f733922 | 849 | int lttng_fix_pending_events(void) |
e58095ef MD |
850 | { |
851 | struct lttng_session *session; | |
852 | ||
853 | cds_list_for_each_entry(session, &sessions, node) { | |
854 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 855 | } |
e58095ef MD |
856 | return 0; |
857 | } | |
858 | ||
246be17e | 859 | /* |
37dddb65 MD |
860 | * For each session of the owner thread, execute pending statedump. |
861 | * Only dump state for the sessions owned by the caller thread, because | |
862 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 863 | */ |
3327ac33 | 864 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
865 | { |
866 | struct lttng_session *session; | |
867 | ||
37dddb65 | 868 | /* Execute state dump */ |
cf73e0fe | 869 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
870 | |
871 | /* Clear pending state dump */ | |
3327ac33 MD |
872 | if (ust_lock()) { |
873 | goto end; | |
874 | } | |
246be17e | 875 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
876 | if (session->owner != owner) |
877 | continue; | |
878 | if (!session->statedump_pending) | |
879 | continue; | |
880 | session->statedump_pending = 0; | |
246be17e | 881 | } |
3327ac33 | 882 | end: |
37dddb65 | 883 | ust_unlock(); |
3327ac33 | 884 | return; |
246be17e PW |
885 | } |
886 | ||
e58095ef MD |
887 | /* |
888 | * Only used internally at session destruction. | |
889 | */ | |
890 | static | |
891 | void _lttng_event_destroy(struct lttng_event *event) | |
892 | { | |
893 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
894 | ||
e58095ef | 895 | cds_list_del(&event->node); |
8020ceb5 | 896 | lttng_destroy_context(event->ctx); |
f488575f | 897 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
898 | /* Free event enabler refs */ |
899 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
900 | &event->enablers_ref_head, node) | |
901 | free(enabler_ref); | |
b5234c06 | 902 | free(event); |
8020ceb5 MD |
903 | } |
904 | ||
c785c634 MD |
905 | static |
906 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
907 | { | |
908 | cds_list_del(&_enum->node); | |
909 | free(_enum); | |
910 | } | |
911 | ||
003fedf4 | 912 | void lttng_ust_events_exit(void) |
8020ceb5 | 913 | { |
7dd08bec | 914 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 915 | |
e58095ef | 916 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 917 | lttng_session_destroy(session); |
8020ceb5 | 918 | } |
457a6b58 | 919 | |
e58095ef MD |
920 | /* |
921 | * Enabler management. | |
922 | */ | |
923 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
924 | struct lttng_ust_event *event_param, | |
925 | struct lttng_channel *chan) | |
457a6b58 | 926 | { |
e58095ef MD |
927 | struct lttng_enabler *enabler; |
928 | ||
929 | enabler = zmalloc(sizeof(*enabler)); | |
930 | if (!enabler) | |
931 | return NULL; | |
932 | enabler->type = type; | |
933 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
0f63324a | 934 | CDS_INIT_LIST_HEAD(&enabler->excluder_head); |
e58095ef MD |
935 | memcpy(&enabler->event_param, event_param, |
936 | sizeof(enabler->event_param)); | |
937 | enabler->chan = chan; | |
938 | /* ctx left NULL */ | |
89f26d57 | 939 | enabler->enabled = 0; |
e58095ef MD |
940 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); |
941 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
942 | return enabler; | |
457a6b58 MD |
943 | } |
944 | ||
e58095ef | 945 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 946 | { |
e58095ef MD |
947 | enabler->enabled = 1; |
948 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
949 | return 0; | |
457a6b58 | 950 | } |
457a6b58 | 951 | |
e58095ef | 952 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 953 | { |
e58095ef MD |
954 | enabler->enabled = 0; |
955 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
956 | return 0; | |
957 | } | |
457a6b58 | 958 | |
e58095ef MD |
959 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
960 | struct lttng_ust_filter_bytecode_node *bytecode) | |
961 | { | |
962 | bytecode->enabler = enabler; | |
963 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
964 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
965 | return 0; | |
0bfb5cbd JI |
966 | } |
967 | ||
968 | int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
969 | struct lttng_ust_excluder_node *excluder) | |
970 | { | |
971 | excluder->enabler = enabler; | |
972 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
973 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
974 | return 0; | |
e58095ef | 975 | } |
f488575f | 976 | |
e58095ef | 977 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 978 | union ust_args *uargs, |
e58095ef MD |
979 | struct lttng_ctx **ctx, struct lttng_session *session) |
980 | { | |
457a6b58 | 981 | /* |
e58095ef MD |
982 | * We cannot attach a context after trace has been started for a |
983 | * session because the metadata does not allow expressing this | |
984 | * information outside of the original channel scope. | |
457a6b58 | 985 | */ |
e58095ef MD |
986 | if (session->been_active) |
987 | return -EPERM; | |
457a6b58 | 988 | |
e58095ef MD |
989 | switch (context_param->ctx) { |
990 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
991 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
992 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
993 | { | |
994 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
995 | ||
996 | perf_ctx_param = &context_param->u.perf_counter; | |
997 | return lttng_add_perf_counter_to_ctx( | |
998 | perf_ctx_param->type, | |
999 | perf_ctx_param->config, | |
1000 | perf_ctx_param->name, | |
1001 | ctx); | |
1002 | } | |
e58095ef MD |
1003 | case LTTNG_UST_CONTEXT_VTID: |
1004 | return lttng_add_vtid_to_ctx(ctx); | |
1005 | case LTTNG_UST_CONTEXT_VPID: | |
1006 | return lttng_add_vpid_to_ctx(ctx); | |
1007 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1008 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1009 | case LTTNG_UST_CONTEXT_IP: |
1010 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1011 | case LTTNG_UST_CONTEXT_CPU_ID: |
1012 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1013 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1014 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1015 | ctx); | |
e58095ef MD |
1016 | default: |
1017 | return -EINVAL; | |
457a6b58 | 1018 | } |
457a6b58 MD |
1019 | } |
1020 | ||
e58095ef MD |
1021 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1022 | struct lttng_ust_context *context_param) | |
457a6b58 | 1023 | { |
e58095ef MD |
1024 | #if 0 // disabled for now. |
1025 | struct lttng_session *session = enabler->chan->session; | |
1026 | int ret; | |
457a6b58 | 1027 | |
e58095ef MD |
1028 | ret = lttng_attach_context(context_param, &enabler->ctx, |
1029 | session); | |
1030 | if (ret) | |
1031 | return ret; | |
1032 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1033 | #endif | |
1034 | return -ENOSYS; | |
457a6b58 MD |
1035 | } |
1036 | ||
e58095ef MD |
1037 | static |
1038 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 1039 | { |
e58095ef | 1040 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
0f63324a | 1041 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
457a6b58 | 1042 | |
e58095ef MD |
1043 | /* Destroy filter bytecode */ |
1044 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1045 | &enabler->filter_bytecode_head, node) { | |
1046 | free(filter_node); | |
457a6b58 | 1047 | } |
e58095ef | 1048 | |
0f63324a JI |
1049 | /* Destroy excluders */ |
1050 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
1051 | &enabler->excluder_head, node) { | |
1052 | free(excluder_node); | |
1053 | } | |
1054 | ||
e58095ef MD |
1055 | /* Destroy contexts */ |
1056 | lttng_destroy_context(enabler->ctx); | |
1057 | ||
1058 | cds_list_del(&enabler->node); | |
1059 | free(enabler); | |
457a6b58 MD |
1060 | } |
1061 | ||
e58095ef MD |
1062 | /* |
1063 | * lttng_session_sync_enablers should be called just before starting a | |
1064 | * session. | |
1065 | */ | |
457a6b58 | 1066 | static |
e58095ef | 1067 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 1068 | { |
e58095ef MD |
1069 | struct lttng_enabler *enabler; |
1070 | struct lttng_event *event; | |
457a6b58 | 1071 | |
e58095ef MD |
1072 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
1073 | lttng_enabler_ref_events(enabler); | |
1074 | /* | |
1075 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1076 | * and its channel and session transient states are enabled, we |
1077 | * enable the event, else we disable it. | |
e58095ef MD |
1078 | */ |
1079 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1080 | struct lttng_enabler_ref *enabler_ref; | |
1081 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1082 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1083 | |
1084 | /* Enable events */ | |
1085 | cds_list_for_each_entry(enabler_ref, | |
1086 | &event->enablers_ref_head, node) { | |
1087 | if (enabler_ref->ref->enabled) { | |
1088 | enabled = 1; | |
1089 | break; | |
1090 | } | |
1091 | } | |
ac6b4ac6 MD |
1092 | /* |
1093 | * Enabled state is based on union of enablers, with | |
1094 | * intesection of session and channel transient enable | |
1095 | * states. | |
1096 | */ | |
1097 | enabled = enabled && session->tstate && event->chan->tstate; | |
1098 | ||
1099 | CMM_STORE_SHARED(event->enabled, enabled); | |
1100 | /* | |
1101 | * Sync tracepoint registration with event enabled | |
1102 | * state. | |
1103 | */ | |
1104 | if (enabled) { | |
1105 | if (!event->registered) | |
1106 | register_event(event); | |
1107 | } else { | |
1108 | if (event->registered) | |
1109 | unregister_event(event); | |
1110 | } | |
457a6b58 | 1111 | |
1f49fc05 | 1112 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1113 | cds_list_for_each_entry(enabler_ref, |
1114 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1115 | if (enabler_ref->ref->enabled |
1116 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1117 | has_enablers_without_bytecode = 1; |
1118 | break; | |
1119 | } | |
1120 | } | |
1121 | event->has_enablers_without_bytecode = | |
1122 | has_enablers_without_bytecode; | |
1123 | ||
e58095ef MD |
1124 | /* Enable filters */ |
1125 | cds_list_for_each_entry(runtime, | |
1126 | &event->bytecode_runtime_head, node) { | |
1127 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
1128 | } |
1129 | } | |
baa1e0bc | 1130 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1131 | } |
1132 | ||
e58095ef MD |
1133 | /* |
1134 | * Apply enablers to session events, adding events to session if need | |
1135 | * be. It is required after each modification applied to an active | |
1136 | * session, and right before session "start". | |
1137 | * "lazy" sync means we only sync if required. | |
1138 | */ | |
1139 | static | |
1140 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 1141 | { |
e58095ef MD |
1142 | /* We can skip if session is not active */ |
1143 | if (!session->active) | |
1144 | return; | |
1145 | lttng_session_sync_enablers(session); | |
457a6b58 | 1146 | } |
53569322 MD |
1147 | |
1148 | /* | |
1149 | * Update all sessions with the given app context. | |
1150 | * Called with ust lock held. | |
1151 | * This is invoked when an application context gets loaded/unloaded. It | |
1152 | * ensures the context callbacks are in sync with the application | |
1153 | * context (either app context callbacks, or dummy callbacks). | |
1154 | */ | |
1155 | void lttng_ust_context_set_session_provider(const char *name, | |
1156 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1157 | void (*record)(struct lttng_ctx_field *field, | |
1158 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1159 | struct lttng_channel *chan), | |
1160 | void (*get_value)(struct lttng_ctx_field *field, | |
1161 | struct lttng_ctx_value *value)) | |
1162 | { | |
1163 | struct lttng_session *session; | |
1164 | ||
1165 | cds_list_for_each_entry(session, &sessions, node) { | |
1166 | struct lttng_channel *chan; | |
1167 | struct lttng_event *event; | |
1168 | int ret; | |
1169 | ||
1170 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1171 | name, get_size, record, get_value); | |
1172 | if (ret) | |
1173 | abort(); | |
1174 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1175 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1176 | name, get_size, record, get_value); | |
1177 | if (ret) | |
1178 | abort(); | |
1179 | } | |
1180 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1181 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1182 | name, get_size, record, get_value); | |
1183 | if (ret) | |
1184 | abort(); | |
1185 | } | |
1186 | } | |
1187 | } |