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> | |
196ec2df | 36 | #include <stdbool.h> |
2ae57758 | 37 | #include <lttng/ust-endian.h> |
28b12049 | 38 | #include "clock.h" |
44c72f10 MD |
39 | |
40 | #include <urcu-bp.h> | |
41 | #include <urcu/compiler.h> | |
42 | #include <urcu/uatomic.h> | |
43 | #include <urcu/arch.h> | |
44 | ||
45 | #include <lttng/tracepoint.h> | |
4318ae1b | 46 | #include <lttng/ust-events.h> |
44c72f10 MD |
47 | |
48 | #include <usterr-signal-safe.h> | |
49 | #include <helper.h> | |
7d3e35b6 | 50 | #include <lttng/ust-ctl.h> |
32ce8569 | 51 | #include <ust-comm.h> |
53569322 MD |
52 | #include <lttng/ust-dynamic-type.h> |
53 | #include <lttng/ust-context-provider.h> | |
1f18504e | 54 | #include "error.h" |
08114193 | 55 | #include "compat.h" |
eda498b8 | 56 | #include "lttng-ust-uuid.h" |
44c72f10 | 57 | |
457a6b58 | 58 | #include "tracepoint-internal.h" |
196ec2df | 59 | #include "string-utils.h" |
7dd08bec MD |
60 | #include "lttng-tracer.h" |
61 | #include "lttng-tracer-core.h" | |
cf73e0fe | 62 | #include "lttng-ust-statedump.h" |
b728d87e | 63 | #include "wait.h" |
8d8a24c8 | 64 | #include "../libringbuffer/shm.h" |
596c4223 | 65 | #include "jhash.h" |
8165c8da MD |
66 | |
67 | /* | |
3327ac33 MD |
68 | * All operations within this file are called by the communication |
69 | * thread, under ust_lock protection. | |
8165c8da | 70 | */ |
8165c8da | 71 | |
b5234c06 | 72 | static CDS_LIST_HEAD(sessions); |
8165c8da | 73 | |
37dddb65 MD |
74 | struct cds_list_head *_lttng_get_sessions(void) |
75 | { | |
76 | return &sessions; | |
77 | } | |
78 | ||
7dd08bec | 79 | static void _lttng_event_destroy(struct lttng_event *event); |
c785c634 | 80 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 81 | |
e58095ef MD |
82 | static |
83 | void lttng_session_lazy_sync_enablers(struct lttng_session *session); | |
84 | static | |
85 | void lttng_session_sync_enablers(struct lttng_session *session); | |
86 | static | |
87 | void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
88 | ||
6715d7d1 MD |
89 | /* |
90 | * Called with ust lock held. | |
91 | */ | |
92 | int lttng_session_active(void) | |
93 | { | |
94 | struct lttng_session *iter; | |
95 | ||
96 | cds_list_for_each_entry(iter, &sessions, node) { | |
97 | if (iter->active) | |
98 | return 1; | |
99 | } | |
100 | return 0; | |
101 | } | |
102 | ||
e58095ef MD |
103 | static |
104 | int lttng_loglevel_match(int loglevel, | |
105 | unsigned int has_loglevel, | |
457a6b58 MD |
106 | enum lttng_ust_loglevel_type req_type, |
107 | int req_loglevel) | |
108 | { | |
e58095ef MD |
109 | if (!has_loglevel) |
110 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
111 | switch (req_type) { |
112 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 113 | if (loglevel <= req_loglevel |
67ada458 | 114 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
115 | return 1; |
116 | else | |
117 | return 0; | |
118 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 119 | if (loglevel == req_loglevel |
67ada458 | 120 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
121 | return 1; |
122 | else | |
123 | return 0; | |
124 | case LTTNG_UST_LOGLEVEL_ALL: | |
125 | default: | |
67ada458 | 126 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
127 | return 1; |
128 | else | |
129 | return 0; | |
457a6b58 MD |
130 | } |
131 | } | |
132 | ||
8020ceb5 MD |
133 | void synchronize_trace(void) |
134 | { | |
8020ceb5 | 135 | synchronize_rcu(); |
8020ceb5 MD |
136 | } |
137 | ||
7dd08bec | 138 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 139 | { |
7dd08bec | 140 | struct lttng_session *session; |
74d81a6c | 141 | int i; |
8020ceb5 | 142 | |
7dd08bec | 143 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
144 | if (!session) |
145 | return NULL; | |
53569322 MD |
146 | if (lttng_session_context_init(&session->ctx)) { |
147 | free(session); | |
148 | return NULL; | |
149 | } | |
e58095ef MD |
150 | CDS_INIT_LIST_HEAD(&session->chan_head); |
151 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 152 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 153 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
154 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
155 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
156 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
157 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 158 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
159 | return session; |
160 | } | |
161 | ||
74d81a6c MD |
162 | /* |
163 | * Only used internally at session destruction. | |
164 | */ | |
165 | static | |
166 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
167 | { | |
168 | struct channel *chan; | |
169 | struct lttng_ust_shm_handle *handle; | |
170 | ||
171 | cds_list_del(<tng_chan->node); | |
172 | lttng_destroy_context(lttng_chan->ctx); | |
173 | chan = lttng_chan->chan; | |
174 | handle = lttng_chan->handle; | |
175 | /* | |
176 | * note: lttng_chan is private data contained within handle. It | |
177 | * will be freed along with the handle. | |
178 | */ | |
179 | channel_destroy(chan, handle, 0); | |
180 | } | |
181 | ||
ac6b4ac6 MD |
182 | static |
183 | void register_event(struct lttng_event *event) | |
184 | { | |
185 | int ret; | |
186 | const struct lttng_event_desc *desc; | |
187 | ||
188 | assert(event->registered == 0); | |
189 | desc = event->desc; | |
baa1e0bc | 190 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
191 | desc->probe_callback, |
192 | event, desc->signature); | |
193 | WARN_ON_ONCE(ret); | |
194 | if (!ret) | |
195 | event->registered = 1; | |
196 | } | |
197 | ||
198 | static | |
199 | void unregister_event(struct lttng_event *event) | |
200 | { | |
201 | int ret; | |
202 | const struct lttng_event_desc *desc; | |
203 | ||
204 | assert(event->registered == 1); | |
205 | desc = event->desc; | |
baa1e0bc | 206 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
207 | desc->probe_callback, |
208 | event); | |
209 | WARN_ON_ONCE(ret); | |
210 | if (!ret) | |
211 | event->registered = 0; | |
212 | } | |
213 | ||
214 | /* | |
215 | * Only used internally at session destruction. | |
216 | */ | |
217 | static | |
218 | void _lttng_event_unregister(struct lttng_event *event) | |
219 | { | |
220 | if (event->registered) | |
221 | unregister_event(event); | |
222 | } | |
223 | ||
7dd08bec | 224 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 225 | { |
7dd08bec MD |
226 | struct lttng_channel *chan, *tmpchan; |
227 | struct lttng_event *event, *tmpevent; | |
c785c634 | 228 | struct lttng_enum *_enum, *tmp_enum; |
e58095ef | 229 | struct lttng_enabler *enabler, *tmpenabler; |
8020ceb5 | 230 | |
b5234c06 | 231 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 232 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 233 | _lttng_event_unregister(event); |
8020ceb5 MD |
234 | } |
235 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
baa1e0bc | 236 | __tracepoint_probe_prune_release_queue(); |
e58095ef MD |
237 | cds_list_for_each_entry_safe(enabler, tmpenabler, |
238 | &session->enablers_head, node) | |
239 | lttng_enabler_destroy(enabler); | |
240 | cds_list_for_each_entry_safe(event, tmpevent, | |
241 | &session->events_head, node) | |
7dd08bec | 242 | _lttng_event_destroy(event); |
c785c634 MD |
243 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
244 | &session->enums_head, node) | |
245 | _lttng_enum_destroy(_enum); | |
e58095ef | 246 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 247 | _lttng_channel_unmap(chan); |
e58095ef | 248 | cds_list_del(&session->node); |
53569322 | 249 | lttng_destroy_context(session->ctx); |
b5234c06 | 250 | free(session); |
8020ceb5 MD |
251 | } |
252 | ||
53569322 MD |
253 | static |
254 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
255 | struct lttng_session *session) | |
256 | { | |
257 | const char *enum_name = desc->name; | |
258 | struct lttng_enum *_enum; | |
259 | struct cds_hlist_head *head; | |
260 | struct cds_hlist_node *node; | |
261 | int ret = 0; | |
262 | size_t name_len = strlen(enum_name); | |
263 | uint32_t hash; | |
264 | int notify_socket; | |
265 | ||
266 | hash = jhash(enum_name, name_len, 0); | |
267 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
268 | cds_hlist_for_each_entry(_enum, node, head, hlist) { | |
269 | assert(_enum->desc); | |
270 | if (!strncmp(_enum->desc->name, desc->name, | |
271 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
272 | ret = -EEXIST; | |
273 | goto exist; | |
274 | } | |
275 | } | |
276 | ||
277 | notify_socket = lttng_get_notify_socket(session->owner); | |
278 | if (notify_socket < 0) { | |
279 | ret = notify_socket; | |
280 | goto socket_error; | |
281 | } | |
282 | ||
283 | _enum = zmalloc(sizeof(*_enum)); | |
284 | if (!_enum) { | |
285 | ret = -ENOMEM; | |
286 | goto cache_error; | |
287 | } | |
288 | _enum->session = session; | |
289 | _enum->desc = desc; | |
290 | ||
291 | ret = ustcomm_register_enum(notify_socket, | |
292 | session->objd, | |
293 | enum_name, | |
294 | desc->nr_entries, | |
295 | desc->entries, | |
296 | &_enum->id); | |
297 | if (ret < 0) { | |
298 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
299 | goto sessiond_register_error; | |
300 | } | |
301 | cds_list_add(&_enum->node, &session->enums_head); | |
302 | cds_hlist_add_head(&_enum->hlist, head); | |
303 | return 0; | |
304 | ||
305 | sessiond_register_error: | |
306 | free(_enum); | |
307 | cache_error: | |
308 | socket_error: | |
309 | exist: | |
310 | return ret; | |
311 | } | |
312 | ||
313 | static | |
314 | int lttng_create_enum_check(const struct lttng_type *type, | |
315 | struct lttng_session *session) | |
316 | { | |
317 | switch (type->atype) { | |
318 | case atype_enum: | |
319 | { | |
320 | const struct lttng_enum_desc *enum_desc; | |
321 | int ret; | |
322 | ||
323 | enum_desc = type->u.basic.enumeration.desc; | |
324 | ret = lttng_enum_create(enum_desc, session); | |
325 | if (ret && ret != -EEXIST) { | |
326 | DBG("Unable to create enum error: (%d)", ret); | |
327 | return ret; | |
328 | } | |
329 | break; | |
330 | } | |
331 | case atype_dynamic: | |
332 | { | |
333 | const struct lttng_event_field *tag_field_generic; | |
334 | const struct lttng_enum_desc *enum_desc; | |
335 | int ret; | |
336 | ||
337 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
338 | enum_desc = tag_field_generic->type.u.basic.enumeration.desc; | |
339 | ret = lttng_enum_create(enum_desc, session); | |
340 | if (ret && ret != -EEXIST) { | |
341 | DBG("Unable to create enum error: (%d)", ret); | |
342 | return ret; | |
343 | } | |
344 | break; | |
345 | } | |
346 | default: | |
347 | /* TODO: nested types when they become supported. */ | |
348 | break; | |
349 | } | |
350 | return 0; | |
351 | } | |
352 | ||
353 | static | |
354 | int lttng_create_all_event_enums(size_t nr_fields, | |
355 | const struct lttng_event_field *event_fields, | |
356 | struct lttng_session *session) | |
357 | { | |
358 | size_t i; | |
359 | int ret; | |
360 | ||
361 | /* For each field, ensure enum is part of the session. */ | |
362 | for (i = 0; i < nr_fields; i++) { | |
363 | const struct lttng_type *type = &event_fields[i].type; | |
364 | ||
365 | ret = lttng_create_enum_check(type, session); | |
366 | if (ret) | |
367 | return ret; | |
368 | } | |
369 | return 0; | |
370 | } | |
371 | ||
372 | static | |
373 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
374 | const struct lttng_ctx_field *ctx_fields, | |
375 | struct lttng_session *session) | |
376 | { | |
377 | size_t i; | |
378 | int ret; | |
379 | ||
380 | /* For each field, ensure enum is part of the session. */ | |
381 | for (i = 0; i < nr_fields; i++) { | |
382 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
383 | ||
384 | ret = lttng_create_enum_check(type, session); | |
385 | if (ret) | |
386 | return ret; | |
387 | } | |
388 | return 0; | |
389 | } | |
390 | ||
710b8ee3 MD |
391 | /* |
392 | * Ensure that a state-dump will be performed for this session at the end | |
393 | * of the current handle_message(). | |
394 | */ | |
395 | int lttng_session_statedump(struct lttng_session *session) | |
396 | { | |
397 | session->statedump_pending = 1; | |
398 | lttng_ust_sockinfo_session_enabled(session->owner); | |
399 | return 0; | |
400 | } | |
53569322 | 401 | |
7dd08bec | 402 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
403 | { |
404 | int ret = 0; | |
7dd08bec | 405 | struct lttng_channel *chan; |
32ce8569 | 406 | int notify_socket; |
8020ceb5 | 407 | |
8020ceb5 MD |
408 | if (session->active) { |
409 | ret = -EBUSY; | |
410 | goto end; | |
411 | } | |
412 | ||
32ce8569 MD |
413 | notify_socket = lttng_get_notify_socket(session->owner); |
414 | if (notify_socket < 0) | |
415 | return notify_socket; | |
416 | ||
ac6b4ac6 MD |
417 | /* Set transient enabler state to "enabled" */ |
418 | session->tstate = 1; | |
e58095ef | 419 | |
8020ceb5 MD |
420 | /* |
421 | * Snapshot the number of events per channel to know the type of header | |
422 | * we need to use. | |
423 | */ | |
e58095ef | 424 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 425 | const struct lttng_ctx *ctx; |
83e43212 | 426 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 427 | size_t nr_fields = 0; |
6ca18e66 | 428 | uint32_t chan_id; |
32ce8569 MD |
429 | |
430 | /* don't change it if session stop/restart */ | |
8020ceb5 | 431 | if (chan->header_type) |
32ce8569 MD |
432 | continue; |
433 | ctx = chan->ctx; | |
434 | if (ctx) { | |
435 | nr_fields = ctx->nr_fields; | |
83e43212 | 436 | fields = ctx->fields; |
53569322 MD |
437 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
438 | session); | |
439 | if (ret < 0) { | |
440 | DBG("Error (%d) adding enum to session", ret); | |
441 | return ret; | |
442 | } | |
32ce8569 MD |
443 | } |
444 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 445 | session, |
32ce8569 MD |
446 | session->objd, |
447 | chan->objd, | |
448 | nr_fields, | |
449 | fields, | |
6ca18e66 | 450 | &chan_id, |
32ce8569 | 451 | &chan->header_type); |
b869b5ae MD |
452 | if (ret) { |
453 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 454 | return ret; |
b869b5ae | 455 | } |
6ca18e66 MD |
456 | if (chan_id != chan->id) { |
457 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
458 | chan_id, chan->id); | |
459 | return -EINVAL; | |
460 | } | |
8020ceb5 MD |
461 | } |
462 | ||
5c055275 FD |
463 | /* We need to sync enablers with session before activation. */ |
464 | lttng_session_sync_enablers(session); | |
465 | ||
ac6b4ac6 | 466 | /* Set atomically the state to "active" */ |
b5234c06 MD |
467 | CMM_ACCESS_ONCE(session->active) = 1; |
468 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 469 | |
710b8ee3 MD |
470 | ret = lttng_session_statedump(session); |
471 | if (ret) | |
472 | return ret; | |
8020ceb5 | 473 | end: |
8020ceb5 MD |
474 | return ret; |
475 | } | |
476 | ||
7dd08bec | 477 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
478 | { |
479 | int ret = 0; | |
480 | ||
8020ceb5 MD |
481 | if (!session->active) { |
482 | ret = -EBUSY; | |
483 | goto end; | |
484 | } | |
ac6b4ac6 | 485 | /* Set atomically the state to "inactive" */ |
b5234c06 | 486 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
487 | |
488 | /* Set transient enabler state to "disabled" */ | |
489 | session->tstate = 0; | |
490 | lttng_session_sync_enablers(session); | |
8020ceb5 | 491 | end: |
8020ceb5 MD |
492 | return ret; |
493 | } | |
494 | ||
7dd08bec | 495 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 496 | { |
ac6b4ac6 | 497 | int ret = 0; |
976fe9ea | 498 | |
ac6b4ac6 MD |
499 | if (channel->enabled) { |
500 | ret = -EBUSY; | |
501 | goto end; | |
502 | } | |
503 | /* Set transient enabler state to "enabled" */ | |
504 | channel->tstate = 1; | |
505 | lttng_session_sync_enablers(channel->session); | |
506 | /* Set atomically the state to "enabled" */ | |
507 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
508 | end: | |
509 | return ret; | |
976fe9ea MD |
510 | } |
511 | ||
7dd08bec | 512 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 513 | { |
ac6b4ac6 | 514 | int ret = 0; |
976fe9ea | 515 | |
ac6b4ac6 MD |
516 | if (!channel->enabled) { |
517 | ret = -EBUSY; | |
518 | goto end; | |
519 | } | |
520 | /* Set atomically the state to "disabled" */ | |
521 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
522 | /* Set transient enabler state to "enabled" */ | |
523 | channel->tstate = 0; | |
524 | lttng_session_sync_enablers(channel->session); | |
525 | end: | |
526 | return ret; | |
976fe9ea MD |
527 | } |
528 | ||
8020ceb5 MD |
529 | /* |
530 | * Supports event creation while tracing session is active. | |
531 | */ | |
e58095ef MD |
532 | static |
533 | int lttng_event_create(const struct lttng_event_desc *desc, | |
534 | struct lttng_channel *chan) | |
8020ceb5 | 535 | { |
e58095ef | 536 | const char *event_name = desc->name; |
7dd08bec | 537 | struct lttng_event *event; |
32ce8569 | 538 | struct lttng_session *session = chan->session; |
d56fa719 | 539 | struct cds_hlist_head *head; |
576599a0 | 540 | int ret = 0; |
d56fa719 MD |
541 | size_t name_len = strlen(event_name); |
542 | uint32_t hash; | |
32ce8569 MD |
543 | int notify_socket, loglevel; |
544 | const char *uri; | |
8020ceb5 | 545 | |
d56fa719 MD |
546 | hash = jhash(event_name, name_len, 0); |
547 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
457a6b58 | 548 | |
32ce8569 MD |
549 | notify_socket = lttng_get_notify_socket(session->owner); |
550 | if (notify_socket < 0) { | |
551 | ret = notify_socket; | |
552 | goto socket_error; | |
553 | } | |
554 | ||
53569322 MD |
555 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
556 | session); | |
c785c634 MD |
557 | if (ret < 0) { |
558 | DBG("Error (%d) adding enum to session", ret); | |
559 | goto create_enum_error; | |
560 | } | |
561 | ||
457a6b58 MD |
562 | /* |
563 | * Check if loglevel match. Refuse to connect event if not. | |
564 | */ | |
7dd08bec | 565 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
566 | if (!event) { |
567 | ret = -ENOMEM; | |
8020ceb5 | 568 | goto cache_error; |
576599a0 | 569 | } |
8020ceb5 | 570 | event->chan = chan; |
e58095ef | 571 | |
ac6b4ac6 MD |
572 | /* Event will be enabled by enabler sync. */ |
573 | event->enabled = 0; | |
574 | event->registered = 0; | |
e58095ef MD |
575 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
576 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
577 | event->desc = desc; | |
32ce8569 MD |
578 | |
579 | if (desc->loglevel) | |
580 | loglevel = *(*event->desc->loglevel); | |
581 | else | |
582 | loglevel = TRACE_DEFAULT; | |
583 | if (desc->u.ext.model_emf_uri) | |
584 | uri = *(desc->u.ext.model_emf_uri); | |
585 | else | |
586 | uri = NULL; | |
587 | ||
13b21cd6 MD |
588 | /* Fetch event ID from sessiond */ |
589 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 590 | session, |
13b21cd6 MD |
591 | session->objd, |
592 | chan->objd, | |
593 | event_name, | |
594 | loglevel, | |
595 | desc->signature, | |
596 | desc->nr_fields, | |
597 | desc->fields, | |
598 | uri, | |
599 | &event->id); | |
600 | if (ret < 0) { | |
601 | DBG("Error (%d) registering event to sessiond", ret); | |
602 | goto sessiond_register_error; | |
32ce8569 | 603 | } |
2b213b16 | 604 | |
7dd08bec | 605 | /* Populate lttng_event structure before tracepoint registration. */ |
b5234c06 | 606 | cmm_smp_wmb(); |
e58095ef | 607 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 608 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 609 | return 0; |
8020ceb5 | 610 | |
32ce8569 | 611 | sessiond_register_error: |
b5234c06 | 612 | free(event); |
8020ceb5 | 613 | cache_error: |
c785c634 | 614 | create_enum_error: |
32ce8569 | 615 | socket_error: |
576599a0 | 616 | return ret; |
8020ceb5 MD |
617 | } |
618 | ||
e58095ef | 619 | static |
196ec2df | 620 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
621 | struct lttng_enabler *enabler) |
622 | { | |
623 | int loglevel = 0; | |
7e2e405c | 624 | unsigned int has_loglevel = 0; |
e58095ef | 625 | |
196ec2df | 626 | assert(enabler->type == LTTNG_ENABLER_STAR_GLOB); |
1f6f42e6 MD |
627 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
628 | desc->name, SIZE_MAX)) | |
e58095ef MD |
629 | return 0; |
630 | if (desc->loglevel) { | |
631 | loglevel = *(*desc->loglevel); | |
632 | has_loglevel = 1; | |
633 | } | |
634 | if (!lttng_loglevel_match(loglevel, | |
635 | has_loglevel, | |
636 | enabler->event_param.loglevel_type, | |
637 | enabler->event_param.loglevel)) | |
638 | return 0; | |
639 | return 1; | |
640 | } | |
641 | ||
642 | static | |
643 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
644 | struct lttng_enabler *enabler) | |
645 | { | |
646 | int loglevel = 0; | |
647 | unsigned int has_loglevel = 0; | |
648 | ||
649 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
650 | if (strcmp(desc->name, enabler->event_param.name)) | |
651 | return 0; | |
652 | if (desc->loglevel) { | |
653 | loglevel = *(*desc->loglevel); | |
654 | has_loglevel = 1; | |
655 | } | |
656 | if (!lttng_loglevel_match(loglevel, | |
657 | has_loglevel, | |
658 | enabler->event_param.loglevel_type, | |
659 | enabler->event_param.loglevel)) | |
660 | return 0; | |
661 | return 1; | |
662 | } | |
663 | ||
664 | static | |
665 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
666 | struct lttng_enabler *enabler) | |
667 | { | |
196ec2df PP |
668 | switch (enabler->type) { |
669 | case LTTNG_ENABLER_STAR_GLOB: | |
670 | { | |
671 | struct lttng_ust_excluder_node *excluder; | |
672 | ||
673 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
674 | return 0; | |
675 | } | |
676 | ||
677 | /* | |
678 | * If the matching event matches with an excluder, | |
679 | * return 'does not match' | |
680 | */ | |
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 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); | |
1f6f42e6 | 691 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 692 | return 0; |
ed5b5bbd JI |
693 | } |
694 | } | |
196ec2df | 695 | return 1; |
ed5b5bbd | 696 | } |
e58095ef MD |
697 | case LTTNG_ENABLER_EVENT: |
698 | return lttng_desc_match_event_enabler(desc, enabler); | |
699 | default: | |
700 | return -EINVAL; | |
701 | } | |
702 | } | |
703 | ||
704 | static | |
705 | int lttng_event_match_enabler(struct lttng_event *event, | |
706 | struct lttng_enabler *enabler) | |
707 | { | |
d970f72e MD |
708 | if (lttng_desc_match_enabler(event->desc, enabler) |
709 | && event->chan == enabler->chan) | |
710 | return 1; | |
711 | else | |
712 | return 0; | |
e58095ef MD |
713 | } |
714 | ||
715 | static | |
716 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
717 | struct lttng_enabler *enabler) | |
718 | { | |
719 | struct lttng_enabler_ref *enabler_ref; | |
720 | ||
721 | cds_list_for_each_entry(enabler_ref, | |
722 | &event->enablers_ref_head, node) { | |
723 | if (enabler_ref->ref == enabler) | |
724 | return enabler_ref; | |
725 | } | |
726 | return NULL; | |
727 | } | |
728 | ||
8020ceb5 | 729 | /* |
e58095ef MD |
730 | * Create struct lttng_event if it is missing and present in the list of |
731 | * tracepoint probes. | |
8020ceb5 | 732 | */ |
e58095ef MD |
733 | static |
734 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 735 | { |
e58095ef MD |
736 | struct lttng_session *session = enabler->chan->session; |
737 | struct lttng_probe_desc *probe_desc; | |
738 | const struct lttng_event_desc *desc; | |
739 | struct lttng_event *event; | |
740 | int i; | |
741 | struct cds_list_head *probe_list; | |
742 | ||
743 | probe_list = lttng_get_probe_list_head(); | |
744 | /* | |
745 | * For each probe event, if we find that a probe event matches | |
746 | * our enabler, create an associated lttng_event if not | |
747 | * already present. | |
748 | */ | |
749 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
750 | for (i = 0; i < probe_desc->nr_events; i++) { | |
751 | int found = 0, ret; | |
d56fa719 MD |
752 | struct cds_hlist_head *head; |
753 | struct cds_hlist_node *node; | |
754 | const char *event_name; | |
755 | size_t name_len; | |
756 | uint32_t hash; | |
e58095ef MD |
757 | |
758 | desc = probe_desc->event_desc[i]; | |
759 | if (!lttng_desc_match_enabler(desc, enabler)) | |
760 | continue; | |
d56fa719 MD |
761 | event_name = desc->name; |
762 | name_len = strlen(event_name); | |
e58095ef MD |
763 | |
764 | /* | |
d56fa719 | 765 | * Check if already created. |
e58095ef | 766 | */ |
d56fa719 MD |
767 | hash = jhash(event_name, name_len, 0); |
768 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
769 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
d970f72e MD |
770 | if (event->desc == desc |
771 | && event->chan == enabler->chan) | |
e58095ef MD |
772 | found = 1; |
773 | } | |
774 | if (found) | |
775 | continue; | |
776 | ||
777 | /* | |
778 | * We need to create an event for this | |
779 | * event probe. | |
780 | */ | |
781 | ret = lttng_event_create(probe_desc->event_desc[i], | |
782 | enabler->chan); | |
783 | if (ret) { | |
32ce8569 MD |
784 | DBG("Unable to create event %s, error %d\n", |
785 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 786 | } |
8165c8da | 787 | } |
8020ceb5 | 788 | } |
8020ceb5 MD |
789 | } |
790 | ||
35ac38cb FD |
791 | /* |
792 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
793 | * the probe provider descriptor received as argument. Must me called with the | |
794 | * ust_lock held. | |
795 | */ | |
796 | void lttng_probe_provider_unregister_events(struct lttng_probe_desc *provider_desc) | |
797 | { | |
798 | struct cds_hlist_node *node, *tmp_node; | |
799 | struct cds_list_head *sessionsp; | |
800 | struct lttng_session *session; | |
801 | struct cds_hlist_head *head; | |
802 | struct lttng_event *event; | |
803 | int i; | |
804 | ||
805 | /* Get handle on list of sessions. */ | |
806 | sessionsp = _lttng_get_sessions(); | |
807 | ||
808 | /* | |
809 | * Iterate over all events in the probe provider descriptions and sessions | |
810 | * to queue the unregistration of the events. | |
811 | */ | |
812 | for (i = 0; i < provider_desc->nr_events; i++) { | |
813 | const struct lttng_event_desc *event_desc; | |
814 | const char *event_name; | |
815 | size_t name_len; | |
816 | uint32_t hash; | |
817 | ||
818 | event_desc = provider_desc->event_desc[i]; | |
819 | event_name = event_desc->name; | |
820 | name_len = strlen(event_name); | |
821 | hash = jhash(event_name, name_len, 0); | |
822 | ||
823 | /* Iterate over all session to find the current event description. */ | |
824 | cds_list_for_each_entry(session, sessionsp, node) { | |
825 | /* | |
826 | * Get the list of events in the hashtable bucket and iterate to | |
827 | * find the event matching this descriptor. | |
828 | */ | |
829 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
830 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
831 | if (event_desc == event->desc) { | |
832 | /* Queue the unregistration of this event. */ | |
833 | _lttng_event_unregister(event); | |
834 | break; | |
835 | } | |
836 | } | |
837 | } | |
838 | } | |
839 | ||
840 | /* Wait for grace period. */ | |
841 | synchronize_trace(); | |
842 | /* Prune the unregistration queue. */ | |
843 | __tracepoint_probe_prune_release_queue(); | |
844 | ||
845 | /* | |
846 | * It is now safe to destroy the events and remove them from the event list | |
847 | * and hashtables. | |
848 | */ | |
849 | for (i = 0; i < provider_desc->nr_events; i++) { | |
850 | const struct lttng_event_desc *event_desc; | |
851 | const char *event_name; | |
852 | size_t name_len; | |
853 | uint32_t hash; | |
854 | ||
855 | event_desc = provider_desc->event_desc[i]; | |
856 | event_name = event_desc->name; | |
857 | name_len = strlen(event_name); | |
858 | hash = jhash(event_name, name_len, 0); | |
859 | ||
860 | /* Iterate over all sessions to find the current event description. */ | |
861 | cds_list_for_each_entry(session, sessionsp, node) { | |
862 | /* | |
863 | * Get the list of events in the hashtable bucket and iterate to | |
864 | * find the event matching this descriptor. | |
865 | */ | |
866 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
867 | cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) { | |
868 | if (event_desc == event->desc) { | |
869 | /* Destroy enums of the current event. */ | |
870 | for (j = 0; j < event->desc->nr_fields; j++) { | |
871 | const struct lttng_enum_desc *enum_desc; | |
872 | const struct lttng_event_field *field; | |
873 | struct lttng_enum *curr_enum; | |
874 | ||
875 | field = &(event->desc->fields[j]); | |
876 | if (field->type.atype != atype_enum) { | |
877 | continue; | |
878 | } | |
879 | ||
880 | enum_desc = field->type.u.basic.enumeration.desc; | |
881 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); | |
882 | if (curr_enum) { | |
883 | _lttng_enum_destroy(curr_enum); | |
884 | } | |
885 | } | |
886 | ||
887 | /* Destroy event. */ | |
888 | _lttng_event_destroy(event); | |
889 | break; | |
890 | } | |
891 | } | |
892 | } | |
893 | } | |
894 | } | |
895 | ||
8020ceb5 | 896 | /* |
e58095ef MD |
897 | * Create events associated with an enabler (if not already present), |
898 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
899 | */ |
900 | static | |
e58095ef | 901 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 902 | { |
e58095ef MD |
903 | struct lttng_session *session = enabler->chan->session; |
904 | struct lttng_event *event; | |
905 | ||
906 | /* First ensure that probe events are created for this enabler. */ | |
907 | lttng_create_event_if_missing(enabler); | |
908 | ||
909 | /* For each event matching enabler in session event list. */ | |
910 | cds_list_for_each_entry(event, &session->events_head, node) { | |
911 | struct lttng_enabler_ref *enabler_ref; | |
912 | ||
913 | if (!lttng_event_match_enabler(event, enabler)) | |
914 | continue; | |
915 | ||
916 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
917 | if (!enabler_ref) { | |
918 | /* | |
919 | * If no backward ref, create it. | |
920 | * Add backward ref from event to enabler. | |
921 | */ | |
922 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
923 | if (!enabler_ref) | |
924 | return -ENOMEM; | |
925 | enabler_ref->ref = enabler; | |
926 | cds_list_add(&enabler_ref->node, | |
927 | &event->enablers_ref_head); | |
8165c8da | 928 | } |
e58095ef MD |
929 | |
930 | /* | |
931 | * Link filter bytecodes if not linked yet. | |
932 | */ | |
933 | lttng_enabler_event_link_bytecode(event, enabler); | |
934 | ||
935 | /* TODO: merge event context. */ | |
936 | } | |
937 | return 0; | |
938 | } | |
939 | ||
940 | /* | |
941 | * Called at library load: connect the probe on all enablers matching | |
942 | * this event. | |
5f733922 | 943 | * Called with session mutex held. |
e58095ef | 944 | */ |
5f733922 | 945 | int lttng_fix_pending_events(void) |
e58095ef MD |
946 | { |
947 | struct lttng_session *session; | |
948 | ||
949 | cds_list_for_each_entry(session, &sessions, node) { | |
950 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 951 | } |
e58095ef MD |
952 | return 0; |
953 | } | |
954 | ||
246be17e | 955 | /* |
37dddb65 MD |
956 | * For each session of the owner thread, execute pending statedump. |
957 | * Only dump state for the sessions owned by the caller thread, because | |
958 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 959 | */ |
3327ac33 | 960 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
961 | { |
962 | struct lttng_session *session; | |
963 | ||
37dddb65 | 964 | /* Execute state dump */ |
cf73e0fe | 965 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
966 | |
967 | /* Clear pending state dump */ | |
3327ac33 MD |
968 | if (ust_lock()) { |
969 | goto end; | |
970 | } | |
246be17e | 971 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
972 | if (session->owner != owner) |
973 | continue; | |
974 | if (!session->statedump_pending) | |
975 | continue; | |
976 | session->statedump_pending = 0; | |
246be17e | 977 | } |
3327ac33 | 978 | end: |
37dddb65 | 979 | ust_unlock(); |
3327ac33 | 980 | return; |
246be17e PW |
981 | } |
982 | ||
e58095ef MD |
983 | /* |
984 | * Only used internally at session destruction. | |
985 | */ | |
986 | static | |
987 | void _lttng_event_destroy(struct lttng_event *event) | |
988 | { | |
989 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
990 | ||
35ac38cb | 991 | /* Remove from event list. */ |
e58095ef | 992 | cds_list_del(&event->node); |
35ac38cb FD |
993 | /* Remove from event hash table. */ |
994 | cds_hlist_del(&event->hlist); | |
995 | ||
8020ceb5 | 996 | lttng_destroy_context(event->ctx); |
f488575f | 997 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
998 | /* Free event enabler refs */ |
999 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1000 | &event->enablers_ref_head, node) | |
1001 | free(enabler_ref); | |
b5234c06 | 1002 | free(event); |
8020ceb5 MD |
1003 | } |
1004 | ||
c785c634 MD |
1005 | static |
1006 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1007 | { | |
1008 | cds_list_del(&_enum->node); | |
35ac38cb | 1009 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1010 | free(_enum); |
1011 | } | |
1012 | ||
003fedf4 | 1013 | void lttng_ust_events_exit(void) |
8020ceb5 | 1014 | { |
7dd08bec | 1015 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1016 | |
e58095ef | 1017 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1018 | lttng_session_destroy(session); |
8020ceb5 | 1019 | } |
457a6b58 | 1020 | |
e58095ef MD |
1021 | /* |
1022 | * Enabler management. | |
1023 | */ | |
1024 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1025 | struct lttng_ust_event *event_param, | |
1026 | struct lttng_channel *chan) | |
457a6b58 | 1027 | { |
e58095ef MD |
1028 | struct lttng_enabler *enabler; |
1029 | ||
1030 | enabler = zmalloc(sizeof(*enabler)); | |
1031 | if (!enabler) | |
1032 | return NULL; | |
1033 | enabler->type = type; | |
1034 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
0f63324a | 1035 | CDS_INIT_LIST_HEAD(&enabler->excluder_head); |
e58095ef MD |
1036 | memcpy(&enabler->event_param, event_param, |
1037 | sizeof(enabler->event_param)); | |
1038 | enabler->chan = chan; | |
1039 | /* ctx left NULL */ | |
89f26d57 | 1040 | enabler->enabled = 0; |
e58095ef MD |
1041 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); |
1042 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1043 | return enabler; | |
457a6b58 MD |
1044 | } |
1045 | ||
e58095ef | 1046 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 1047 | { |
e58095ef MD |
1048 | enabler->enabled = 1; |
1049 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1050 | return 0; | |
457a6b58 | 1051 | } |
457a6b58 | 1052 | |
e58095ef | 1053 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 1054 | { |
e58095ef MD |
1055 | enabler->enabled = 0; |
1056 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1057 | return 0; | |
1058 | } | |
457a6b58 | 1059 | |
e58095ef MD |
1060 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1061 | struct lttng_ust_filter_bytecode_node *bytecode) | |
1062 | { | |
1063 | bytecode->enabler = enabler; | |
1064 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
1065 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1066 | return 0; | |
0bfb5cbd JI |
1067 | } |
1068 | ||
1069 | int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
1070 | struct lttng_ust_excluder_node *excluder) | |
1071 | { | |
1072 | excluder->enabler = enabler; | |
1073 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
1074 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1075 | return 0; | |
e58095ef | 1076 | } |
f488575f | 1077 | |
e58095ef | 1078 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1079 | union ust_args *uargs, |
e58095ef MD |
1080 | struct lttng_ctx **ctx, struct lttng_session *session) |
1081 | { | |
457a6b58 | 1082 | /* |
e58095ef MD |
1083 | * We cannot attach a context after trace has been started for a |
1084 | * session because the metadata does not allow expressing this | |
1085 | * information outside of the original channel scope. | |
457a6b58 | 1086 | */ |
e58095ef MD |
1087 | if (session->been_active) |
1088 | return -EPERM; | |
457a6b58 | 1089 | |
e58095ef MD |
1090 | switch (context_param->ctx) { |
1091 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1092 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1093 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1094 | { | |
1095 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1096 | ||
1097 | perf_ctx_param = &context_param->u.perf_counter; | |
1098 | return lttng_add_perf_counter_to_ctx( | |
1099 | perf_ctx_param->type, | |
1100 | perf_ctx_param->config, | |
1101 | perf_ctx_param->name, | |
1102 | ctx); | |
1103 | } | |
e58095ef MD |
1104 | case LTTNG_UST_CONTEXT_VTID: |
1105 | return lttng_add_vtid_to_ctx(ctx); | |
1106 | case LTTNG_UST_CONTEXT_VPID: | |
1107 | return lttng_add_vpid_to_ctx(ctx); | |
1108 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1109 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1110 | case LTTNG_UST_CONTEXT_IP: |
1111 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1112 | case LTTNG_UST_CONTEXT_CPU_ID: |
1113 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1114 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1115 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1116 | ctx); | |
e58095ef MD |
1117 | default: |
1118 | return -EINVAL; | |
457a6b58 | 1119 | } |
457a6b58 MD |
1120 | } |
1121 | ||
e58095ef MD |
1122 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1123 | struct lttng_ust_context *context_param) | |
457a6b58 | 1124 | { |
e58095ef MD |
1125 | #if 0 // disabled for now. |
1126 | struct lttng_session *session = enabler->chan->session; | |
1127 | int ret; | |
457a6b58 | 1128 | |
e58095ef MD |
1129 | ret = lttng_attach_context(context_param, &enabler->ctx, |
1130 | session); | |
1131 | if (ret) | |
1132 | return ret; | |
1133 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1134 | #endif | |
1135 | return -ENOSYS; | |
457a6b58 MD |
1136 | } |
1137 | ||
e58095ef MD |
1138 | static |
1139 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 1140 | { |
e58095ef | 1141 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
0f63324a | 1142 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
457a6b58 | 1143 | |
e58095ef MD |
1144 | /* Destroy filter bytecode */ |
1145 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1146 | &enabler->filter_bytecode_head, node) { | |
1147 | free(filter_node); | |
457a6b58 | 1148 | } |
e58095ef | 1149 | |
0f63324a JI |
1150 | /* Destroy excluders */ |
1151 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
1152 | &enabler->excluder_head, node) { | |
1153 | free(excluder_node); | |
1154 | } | |
1155 | ||
e58095ef MD |
1156 | /* Destroy contexts */ |
1157 | lttng_destroy_context(enabler->ctx); | |
1158 | ||
1159 | cds_list_del(&enabler->node); | |
1160 | free(enabler); | |
457a6b58 MD |
1161 | } |
1162 | ||
e58095ef MD |
1163 | /* |
1164 | * lttng_session_sync_enablers should be called just before starting a | |
1165 | * session. | |
1166 | */ | |
457a6b58 | 1167 | static |
e58095ef | 1168 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 1169 | { |
e58095ef MD |
1170 | struct lttng_enabler *enabler; |
1171 | struct lttng_event *event; | |
457a6b58 | 1172 | |
e58095ef MD |
1173 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
1174 | lttng_enabler_ref_events(enabler); | |
1175 | /* | |
1176 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1177 | * and its channel and session transient states are enabled, we |
1178 | * enable the event, else we disable it. | |
e58095ef MD |
1179 | */ |
1180 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1181 | struct lttng_enabler_ref *enabler_ref; | |
1182 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1183 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1184 | |
1185 | /* Enable events */ | |
1186 | cds_list_for_each_entry(enabler_ref, | |
1187 | &event->enablers_ref_head, node) { | |
1188 | if (enabler_ref->ref->enabled) { | |
1189 | enabled = 1; | |
1190 | break; | |
1191 | } | |
1192 | } | |
ac6b4ac6 MD |
1193 | /* |
1194 | * Enabled state is based on union of enablers, with | |
1195 | * intesection of session and channel transient enable | |
1196 | * states. | |
1197 | */ | |
1198 | enabled = enabled && session->tstate && event->chan->tstate; | |
1199 | ||
1200 | CMM_STORE_SHARED(event->enabled, enabled); | |
1201 | /* | |
1202 | * Sync tracepoint registration with event enabled | |
1203 | * state. | |
1204 | */ | |
1205 | if (enabled) { | |
1206 | if (!event->registered) | |
1207 | register_event(event); | |
1208 | } else { | |
1209 | if (event->registered) | |
1210 | unregister_event(event); | |
1211 | } | |
457a6b58 | 1212 | |
1f49fc05 | 1213 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1214 | cds_list_for_each_entry(enabler_ref, |
1215 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1216 | if (enabler_ref->ref->enabled |
1217 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1218 | has_enablers_without_bytecode = 1; |
1219 | break; | |
1220 | } | |
1221 | } | |
1222 | event->has_enablers_without_bytecode = | |
1223 | has_enablers_without_bytecode; | |
1224 | ||
e58095ef MD |
1225 | /* Enable filters */ |
1226 | cds_list_for_each_entry(runtime, | |
1227 | &event->bytecode_runtime_head, node) { | |
1228 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
1229 | } |
1230 | } | |
baa1e0bc | 1231 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1232 | } |
1233 | ||
e58095ef MD |
1234 | /* |
1235 | * Apply enablers to session events, adding events to session if need | |
1236 | * be. It is required after each modification applied to an active | |
1237 | * session, and right before session "start". | |
1238 | * "lazy" sync means we only sync if required. | |
1239 | */ | |
1240 | static | |
1241 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 1242 | { |
e58095ef MD |
1243 | /* We can skip if session is not active */ |
1244 | if (!session->active) | |
1245 | return; | |
1246 | lttng_session_sync_enablers(session); | |
457a6b58 | 1247 | } |
53569322 MD |
1248 | |
1249 | /* | |
1250 | * Update all sessions with the given app context. | |
1251 | * Called with ust lock held. | |
1252 | * This is invoked when an application context gets loaded/unloaded. It | |
1253 | * ensures the context callbacks are in sync with the application | |
1254 | * context (either app context callbacks, or dummy callbacks). | |
1255 | */ | |
1256 | void lttng_ust_context_set_session_provider(const char *name, | |
1257 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1258 | void (*record)(struct lttng_ctx_field *field, | |
1259 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1260 | struct lttng_channel *chan), | |
1261 | void (*get_value)(struct lttng_ctx_field *field, | |
1262 | struct lttng_ctx_value *value)) | |
1263 | { | |
1264 | struct lttng_session *session; | |
1265 | ||
1266 | cds_list_for_each_entry(session, &sessions, node) { | |
1267 | struct lttng_channel *chan; | |
1268 | struct lttng_event *event; | |
1269 | int ret; | |
1270 | ||
1271 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1272 | name, get_size, record, get_value); | |
1273 | if (ret) | |
1274 | abort(); | |
1275 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1276 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1277 | name, get_size, record, get_value); | |
1278 | if (ret) | |
1279 | abort(); | |
1280 | } | |
1281 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1282 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1283 | name, get_size, record, get_value); | |
1284 | if (ret) | |
1285 | abort(); | |
1286 | } | |
1287 | } | |
1288 | } |