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 | ||
3fbec7dc | 23 | #define _LGPL_SOURCE |
b5234c06 MD |
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> | |
196ec2df | 35 | #include <stdbool.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" |
196ec2df | 58 | #include "string-utils.h" |
7dd08bec MD |
59 | #include "lttng-tracer.h" |
60 | #include "lttng-tracer-core.h" | |
cf73e0fe | 61 | #include "lttng-ust-statedump.h" |
d871c65b | 62 | #include "ust-events-internal.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 | 82 | static |
d871c65b | 83 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
e58095ef | 84 | static |
d871c65b | 85 | void lttng_session_sync_event_enablers(struct lttng_session *session); |
e58095ef MD |
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; |
d871c65b | 229 | struct lttng_event_enabler *event_enabler, *event_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(); |
d871c65b | 237 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
e58095ef | 238 | &session->enablers_head, node) |
d871c65b | 239 | lttng_event_enabler_destroy(event_enabler); |
e58095ef MD |
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 | ||
d871c65b FD |
253 | static |
254 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
255 | { | |
256 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; | |
257 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; | |
258 | ||
259 | if (!enabler) { | |
260 | return; | |
261 | } | |
262 | ||
263 | /* Destroy filter bytecode */ | |
264 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
265 | &enabler->filter_bytecode_head, node) { | |
266 | free(filter_node); | |
267 | } | |
268 | ||
269 | /* Destroy excluders */ | |
270 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
271 | &enabler->excluder_head, node) { | |
272 | free(excluder_node); | |
273 | } | |
274 | } | |
275 | ||
53569322 MD |
276 | static |
277 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
278 | struct lttng_session *session) | |
279 | { | |
280 | const char *enum_name = desc->name; | |
281 | struct lttng_enum *_enum; | |
282 | struct cds_hlist_head *head; | |
53569322 MD |
283 | int ret = 0; |
284 | size_t name_len = strlen(enum_name); | |
285 | uint32_t hash; | |
286 | int notify_socket; | |
287 | ||
b33b46f7 | 288 | /* Check if this enum is already registered for this session. */ |
53569322 MD |
289 | hash = jhash(enum_name, name_len, 0); |
290 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
b33b46f7 FD |
291 | |
292 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
293 | if (_enum) { | |
294 | ret = -EEXIST; | |
295 | goto exist; | |
53569322 MD |
296 | } |
297 | ||
298 | notify_socket = lttng_get_notify_socket(session->owner); | |
299 | if (notify_socket < 0) { | |
300 | ret = notify_socket; | |
301 | goto socket_error; | |
302 | } | |
303 | ||
304 | _enum = zmalloc(sizeof(*_enum)); | |
305 | if (!_enum) { | |
306 | ret = -ENOMEM; | |
307 | goto cache_error; | |
308 | } | |
309 | _enum->session = session; | |
310 | _enum->desc = desc; | |
311 | ||
312 | ret = ustcomm_register_enum(notify_socket, | |
313 | session->objd, | |
314 | enum_name, | |
315 | desc->nr_entries, | |
316 | desc->entries, | |
317 | &_enum->id); | |
318 | if (ret < 0) { | |
319 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
320 | goto sessiond_register_error; | |
321 | } | |
322 | cds_list_add(&_enum->node, &session->enums_head); | |
323 | cds_hlist_add_head(&_enum->hlist, head); | |
324 | return 0; | |
325 | ||
326 | sessiond_register_error: | |
327 | free(_enum); | |
328 | cache_error: | |
329 | socket_error: | |
330 | exist: | |
331 | return ret; | |
332 | } | |
333 | ||
334 | static | |
335 | int lttng_create_enum_check(const struct lttng_type *type, | |
336 | struct lttng_session *session) | |
337 | { | |
338 | switch (type->atype) { | |
339 | case atype_enum: | |
340 | { | |
341 | const struct lttng_enum_desc *enum_desc; | |
342 | int ret; | |
343 | ||
218deb69 MD |
344 | enum_desc = type->u.legacy.basic.enumeration.desc; |
345 | ret = lttng_enum_create(enum_desc, session); | |
346 | if (ret && ret != -EEXIST) { | |
347 | DBG("Unable to create enum error: (%d)", ret); | |
348 | return ret; | |
349 | } | |
350 | break; | |
351 | } | |
352 | case atype_enum_nestable: | |
353 | { | |
354 | const struct lttng_enum_desc *enum_desc; | |
355 | int ret; | |
356 | ||
357 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
358 | ret = lttng_enum_create(enum_desc, session); |
359 | if (ret && ret != -EEXIST) { | |
360 | DBG("Unable to create enum error: (%d)", ret); | |
361 | return ret; | |
362 | } | |
363 | break; | |
364 | } | |
365 | case atype_dynamic: | |
366 | { | |
367 | const struct lttng_event_field *tag_field_generic; | |
368 | const struct lttng_enum_desc *enum_desc; | |
369 | int ret; | |
370 | ||
371 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 372 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
373 | ret = lttng_enum_create(enum_desc, session); |
374 | if (ret && ret != -EEXIST) { | |
375 | DBG("Unable to create enum error: (%d)", ret); | |
376 | return ret; | |
377 | } | |
378 | break; | |
379 | } | |
380 | default: | |
381 | /* TODO: nested types when they become supported. */ | |
382 | break; | |
383 | } | |
384 | return 0; | |
385 | } | |
386 | ||
387 | static | |
388 | int lttng_create_all_event_enums(size_t nr_fields, | |
389 | const struct lttng_event_field *event_fields, | |
390 | struct lttng_session *session) | |
391 | { | |
392 | size_t i; | |
393 | int ret; | |
394 | ||
395 | /* For each field, ensure enum is part of the session. */ | |
396 | for (i = 0; i < nr_fields; i++) { | |
397 | const struct lttng_type *type = &event_fields[i].type; | |
398 | ||
399 | ret = lttng_create_enum_check(type, session); | |
400 | if (ret) | |
401 | return ret; | |
402 | } | |
403 | return 0; | |
404 | } | |
405 | ||
406 | static | |
407 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
408 | const struct lttng_ctx_field *ctx_fields, | |
409 | struct lttng_session *session) | |
410 | { | |
411 | size_t i; | |
412 | int ret; | |
413 | ||
414 | /* For each field, ensure enum is part of the session. */ | |
415 | for (i = 0; i < nr_fields; i++) { | |
416 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
417 | ||
418 | ret = lttng_create_enum_check(type, session); | |
419 | if (ret) | |
420 | return ret; | |
421 | } | |
422 | return 0; | |
423 | } | |
424 | ||
710b8ee3 MD |
425 | /* |
426 | * Ensure that a state-dump will be performed for this session at the end | |
427 | * of the current handle_message(). | |
428 | */ | |
429 | int lttng_session_statedump(struct lttng_session *session) | |
430 | { | |
431 | session->statedump_pending = 1; | |
432 | lttng_ust_sockinfo_session_enabled(session->owner); | |
433 | return 0; | |
434 | } | |
53569322 | 435 | |
7dd08bec | 436 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
437 | { |
438 | int ret = 0; | |
7dd08bec | 439 | struct lttng_channel *chan; |
32ce8569 | 440 | int notify_socket; |
8020ceb5 | 441 | |
8020ceb5 MD |
442 | if (session->active) { |
443 | ret = -EBUSY; | |
444 | goto end; | |
445 | } | |
446 | ||
32ce8569 MD |
447 | notify_socket = lttng_get_notify_socket(session->owner); |
448 | if (notify_socket < 0) | |
449 | return notify_socket; | |
450 | ||
ac6b4ac6 MD |
451 | /* Set transient enabler state to "enabled" */ |
452 | session->tstate = 1; | |
e58095ef | 453 | |
3ff7660f | 454 | /* We need to sync enablers with session before activation. */ |
d871c65b | 455 | lttng_session_sync_event_enablers(session); |
3ff7660f | 456 | |
8020ceb5 MD |
457 | /* |
458 | * Snapshot the number of events per channel to know the type of header | |
459 | * we need to use. | |
460 | */ | |
e58095ef | 461 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 462 | const struct lttng_ctx *ctx; |
83e43212 | 463 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 464 | size_t nr_fields = 0; |
6ca18e66 | 465 | uint32_t chan_id; |
32ce8569 MD |
466 | |
467 | /* don't change it if session stop/restart */ | |
8020ceb5 | 468 | if (chan->header_type) |
32ce8569 MD |
469 | continue; |
470 | ctx = chan->ctx; | |
471 | if (ctx) { | |
472 | nr_fields = ctx->nr_fields; | |
83e43212 | 473 | fields = ctx->fields; |
53569322 MD |
474 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
475 | session); | |
476 | if (ret < 0) { | |
477 | DBG("Error (%d) adding enum to session", ret); | |
478 | return ret; | |
479 | } | |
32ce8569 MD |
480 | } |
481 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 482 | session, |
32ce8569 MD |
483 | session->objd, |
484 | chan->objd, | |
485 | nr_fields, | |
486 | fields, | |
6ca18e66 | 487 | &chan_id, |
32ce8569 | 488 | &chan->header_type); |
b869b5ae MD |
489 | if (ret) { |
490 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 491 | return ret; |
b869b5ae | 492 | } |
6ca18e66 MD |
493 | if (chan_id != chan->id) { |
494 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
495 | chan_id, chan->id); | |
496 | return -EINVAL; | |
497 | } | |
8020ceb5 MD |
498 | } |
499 | ||
ac6b4ac6 | 500 | /* Set atomically the state to "active" */ |
b5234c06 MD |
501 | CMM_ACCESS_ONCE(session->active) = 1; |
502 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 503 | |
710b8ee3 MD |
504 | ret = lttng_session_statedump(session); |
505 | if (ret) | |
506 | return ret; | |
8020ceb5 | 507 | end: |
8020ceb5 MD |
508 | return ret; |
509 | } | |
510 | ||
7dd08bec | 511 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
512 | { |
513 | int ret = 0; | |
514 | ||
8020ceb5 MD |
515 | if (!session->active) { |
516 | ret = -EBUSY; | |
517 | goto end; | |
518 | } | |
ac6b4ac6 | 519 | /* Set atomically the state to "inactive" */ |
b5234c06 | 520 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
521 | |
522 | /* Set transient enabler state to "disabled" */ | |
523 | session->tstate = 0; | |
d871c65b | 524 | lttng_session_sync_event_enablers(session); |
8020ceb5 | 525 | end: |
8020ceb5 MD |
526 | return ret; |
527 | } | |
528 | ||
7dd08bec | 529 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 530 | { |
ac6b4ac6 | 531 | int ret = 0; |
976fe9ea | 532 | |
ac6b4ac6 MD |
533 | if (channel->enabled) { |
534 | ret = -EBUSY; | |
535 | goto end; | |
536 | } | |
537 | /* Set transient enabler state to "enabled" */ | |
538 | channel->tstate = 1; | |
d871c65b | 539 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
540 | /* Set atomically the state to "enabled" */ |
541 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
542 | end: | |
543 | return ret; | |
976fe9ea MD |
544 | } |
545 | ||
7dd08bec | 546 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 547 | { |
ac6b4ac6 | 548 | int ret = 0; |
976fe9ea | 549 | |
ac6b4ac6 MD |
550 | if (!channel->enabled) { |
551 | ret = -EBUSY; | |
552 | goto end; | |
553 | } | |
554 | /* Set atomically the state to "disabled" */ | |
555 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
556 | /* Set transient enabler state to "enabled" */ | |
557 | channel->tstate = 0; | |
d871c65b | 558 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
559 | end: |
560 | return ret; | |
976fe9ea MD |
561 | } |
562 | ||
8020ceb5 MD |
563 | /* |
564 | * Supports event creation while tracing session is active. | |
565 | */ | |
e58095ef MD |
566 | static |
567 | int lttng_event_create(const struct lttng_event_desc *desc, | |
568 | struct lttng_channel *chan) | |
8020ceb5 | 569 | { |
e58095ef | 570 | const char *event_name = desc->name; |
7dd08bec | 571 | struct lttng_event *event; |
32ce8569 | 572 | struct lttng_session *session = chan->session; |
d56fa719 | 573 | struct cds_hlist_head *head; |
576599a0 | 574 | int ret = 0; |
d56fa719 MD |
575 | size_t name_len = strlen(event_name); |
576 | uint32_t hash; | |
32ce8569 MD |
577 | int notify_socket, loglevel; |
578 | const char *uri; | |
8020ceb5 | 579 | |
d56fa719 MD |
580 | hash = jhash(event_name, name_len, 0); |
581 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
457a6b58 | 582 | |
32ce8569 MD |
583 | notify_socket = lttng_get_notify_socket(session->owner); |
584 | if (notify_socket < 0) { | |
585 | ret = notify_socket; | |
586 | goto socket_error; | |
587 | } | |
588 | ||
53569322 MD |
589 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
590 | session); | |
c785c634 MD |
591 | if (ret < 0) { |
592 | DBG("Error (%d) adding enum to session", ret); | |
593 | goto create_enum_error; | |
594 | } | |
595 | ||
457a6b58 MD |
596 | /* |
597 | * Check if loglevel match. Refuse to connect event if not. | |
598 | */ | |
7dd08bec | 599 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
600 | if (!event) { |
601 | ret = -ENOMEM; | |
8020ceb5 | 602 | goto cache_error; |
576599a0 | 603 | } |
8020ceb5 | 604 | event->chan = chan; |
e58095ef | 605 | |
ac6b4ac6 MD |
606 | /* Event will be enabled by enabler sync. */ |
607 | event->enabled = 0; | |
608 | event->registered = 0; | |
e58095ef MD |
609 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
610 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
611 | event->desc = desc; | |
32ce8569 MD |
612 | |
613 | if (desc->loglevel) | |
614 | loglevel = *(*event->desc->loglevel); | |
615 | else | |
616 | loglevel = TRACE_DEFAULT; | |
617 | if (desc->u.ext.model_emf_uri) | |
618 | uri = *(desc->u.ext.model_emf_uri); | |
619 | else | |
620 | uri = NULL; | |
621 | ||
13b21cd6 MD |
622 | /* Fetch event ID from sessiond */ |
623 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 624 | session, |
13b21cd6 MD |
625 | session->objd, |
626 | chan->objd, | |
627 | event_name, | |
628 | loglevel, | |
629 | desc->signature, | |
630 | desc->nr_fields, | |
631 | desc->fields, | |
632 | uri, | |
633 | &event->id); | |
634 | if (ret < 0) { | |
635 | DBG("Error (%d) registering event to sessiond", ret); | |
636 | goto sessiond_register_error; | |
32ce8569 | 637 | } |
2b213b16 | 638 | |
e58095ef | 639 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 640 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 641 | return 0; |
8020ceb5 | 642 | |
32ce8569 | 643 | sessiond_register_error: |
b5234c06 | 644 | free(event); |
8020ceb5 | 645 | cache_error: |
c785c634 | 646 | create_enum_error: |
32ce8569 | 647 | socket_error: |
576599a0 | 648 | return ret; |
8020ceb5 MD |
649 | } |
650 | ||
e58095ef | 651 | static |
196ec2df | 652 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
653 | struct lttng_enabler *enabler) |
654 | { | |
655 | int loglevel = 0; | |
7e2e405c | 656 | unsigned int has_loglevel = 0; |
e58095ef | 657 | |
e450e339 | 658 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f6f42e6 MD |
659 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
660 | desc->name, SIZE_MAX)) | |
e58095ef MD |
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_event_enabler(const struct lttng_event_desc *desc, | |
676 | struct lttng_enabler *enabler) | |
677 | { | |
678 | int loglevel = 0; | |
679 | unsigned int has_loglevel = 0; | |
680 | ||
e450e339 | 681 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
e58095ef MD |
682 | if (strcmp(desc->name, enabler->event_param.name)) |
683 | return 0; | |
684 | if (desc->loglevel) { | |
685 | loglevel = *(*desc->loglevel); | |
686 | has_loglevel = 1; | |
687 | } | |
688 | if (!lttng_loglevel_match(loglevel, | |
689 | has_loglevel, | |
690 | enabler->event_param.loglevel_type, | |
691 | enabler->event_param.loglevel)) | |
692 | return 0; | |
693 | return 1; | |
694 | } | |
695 | ||
696 | static | |
697 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
698 | struct lttng_enabler *enabler) | |
699 | { | |
e450e339 FD |
700 | switch (enabler->format_type) { |
701 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
196ec2df PP |
702 | { |
703 | struct lttng_ust_excluder_node *excluder; | |
704 | ||
705 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
706 | return 0; | |
707 | } | |
708 | ||
709 | /* | |
710 | * If the matching event matches with an excluder, | |
711 | * return 'does not match' | |
712 | */ | |
713 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
714 | int count; | |
715 | ||
716 | for (count = 0; count < excluder->excluder.count; count++) { | |
717 | int len; | |
718 | char *excluder_name; | |
719 | ||
720 | excluder_name = (char *) (excluder->excluder.names) | |
721 | + count * LTTNG_UST_SYM_NAME_LEN; | |
722 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 723 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 724 | return 0; |
ed5b5bbd JI |
725 | } |
726 | } | |
196ec2df | 727 | return 1; |
ed5b5bbd | 728 | } |
e450e339 | 729 | case LTTNG_ENABLER_FORMAT_EVENT: |
e58095ef MD |
730 | return lttng_desc_match_event_enabler(desc, enabler); |
731 | default: | |
732 | return -EINVAL; | |
733 | } | |
734 | } | |
735 | ||
736 | static | |
d871c65b FD |
737 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
738 | struct lttng_event *event) | |
e58095ef | 739 | { |
d871c65b FD |
740 | if (lttng_desc_match_enabler(event->desc, |
741 | lttng_event_enabler_as_enabler(event_enabler)) | |
742 | && event->chan == event_enabler->chan) | |
d970f72e MD |
743 | return 1; |
744 | else | |
745 | return 0; | |
e58095ef MD |
746 | } |
747 | ||
748 | static | |
d871c65b FD |
749 | struct lttng_enabler_ref *lttng_enabler_ref( |
750 | struct cds_list_head *enabler_ref_list, | |
e58095ef MD |
751 | struct lttng_enabler *enabler) |
752 | { | |
753 | struct lttng_enabler_ref *enabler_ref; | |
754 | ||
d871c65b | 755 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
e58095ef MD |
756 | if (enabler_ref->ref == enabler) |
757 | return enabler_ref; | |
758 | } | |
759 | return NULL; | |
760 | } | |
761 | ||
8020ceb5 | 762 | /* |
e58095ef MD |
763 | * Create struct lttng_event if it is missing and present in the list of |
764 | * tracepoint probes. | |
8020ceb5 | 765 | */ |
e58095ef | 766 | static |
d871c65b | 767 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 768 | { |
d871c65b | 769 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
770 | struct lttng_probe_desc *probe_desc; |
771 | const struct lttng_event_desc *desc; | |
772 | struct lttng_event *event; | |
773 | int i; | |
774 | struct cds_list_head *probe_list; | |
775 | ||
776 | probe_list = lttng_get_probe_list_head(); | |
777 | /* | |
778 | * For each probe event, if we find that a probe event matches | |
779 | * our enabler, create an associated lttng_event if not | |
780 | * already present. | |
781 | */ | |
782 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
783 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
784 | int ret; |
785 | bool found = false; | |
d56fa719 MD |
786 | struct cds_hlist_head *head; |
787 | struct cds_hlist_node *node; | |
788 | const char *event_name; | |
789 | size_t name_len; | |
790 | uint32_t hash; | |
e58095ef MD |
791 | |
792 | desc = probe_desc->event_desc[i]; | |
d871c65b FD |
793 | if (!lttng_desc_match_enabler(desc, |
794 | lttng_event_enabler_as_enabler(event_enabler))) | |
e58095ef | 795 | continue; |
d56fa719 MD |
796 | event_name = desc->name; |
797 | name_len = strlen(event_name); | |
e58095ef MD |
798 | |
799 | /* | |
d56fa719 | 800 | * Check if already created. |
e58095ef | 801 | */ |
d56fa719 MD |
802 | hash = jhash(event_name, name_len, 0); |
803 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
804 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
d970f72e | 805 | if (event->desc == desc |
d871c65b | 806 | && event->chan == event_enabler->chan) { |
98a97f24 | 807 | found = true; |
3140bffe FD |
808 | break; |
809 | } | |
e58095ef MD |
810 | } |
811 | if (found) | |
812 | continue; | |
813 | ||
814 | /* | |
815 | * We need to create an event for this | |
816 | * event probe. | |
817 | */ | |
818 | ret = lttng_event_create(probe_desc->event_desc[i], | |
d871c65b | 819 | event_enabler->chan); |
e58095ef | 820 | if (ret) { |
32ce8569 MD |
821 | DBG("Unable to create event %s, error %d\n", |
822 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 823 | } |
8165c8da | 824 | } |
8020ceb5 | 825 | } |
8020ceb5 MD |
826 | } |
827 | ||
35ac38cb FD |
828 | /* |
829 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
830 | * the probe provider descriptor received as argument. Must me called with the | |
831 | * ust_lock held. | |
832 | */ | |
833 | void lttng_probe_provider_unregister_events(struct lttng_probe_desc *provider_desc) | |
834 | { | |
835 | struct cds_hlist_node *node, *tmp_node; | |
836 | struct cds_list_head *sessionsp; | |
837 | struct lttng_session *session; | |
838 | struct cds_hlist_head *head; | |
839 | struct lttng_event *event; | |
2c05c691 | 840 | unsigned int i, j; |
35ac38cb FD |
841 | |
842 | /* Get handle on list of sessions. */ | |
843 | sessionsp = _lttng_get_sessions(); | |
844 | ||
845 | /* | |
846 | * Iterate over all events in the probe provider descriptions and sessions | |
847 | * to queue the unregistration of the events. | |
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 session 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(event, node, head, hlist) { | |
868 | if (event_desc == event->desc) { | |
869 | /* Queue the unregistration of this event. */ | |
870 | _lttng_event_unregister(event); | |
871 | break; | |
872 | } | |
873 | } | |
874 | } | |
875 | } | |
876 | ||
877 | /* Wait for grace period. */ | |
878 | synchronize_trace(); | |
879 | /* Prune the unregistration queue. */ | |
880 | __tracepoint_probe_prune_release_queue(); | |
881 | ||
882 | /* | |
883 | * It is now safe to destroy the events and remove them from the event list | |
884 | * and hashtables. | |
885 | */ | |
886 | for (i = 0; i < provider_desc->nr_events; i++) { | |
887 | const struct lttng_event_desc *event_desc; | |
888 | const char *event_name; | |
889 | size_t name_len; | |
890 | uint32_t hash; | |
891 | ||
892 | event_desc = provider_desc->event_desc[i]; | |
893 | event_name = event_desc->name; | |
894 | name_len = strlen(event_name); | |
895 | hash = jhash(event_name, name_len, 0); | |
896 | ||
897 | /* Iterate over all sessions to find the current event description. */ | |
898 | cds_list_for_each_entry(session, sessionsp, node) { | |
899 | /* | |
900 | * Get the list of events in the hashtable bucket and iterate to | |
901 | * find the event matching this descriptor. | |
902 | */ | |
903 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
904 | cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) { | |
905 | if (event_desc == event->desc) { | |
906 | /* Destroy enums of the current event. */ | |
907 | for (j = 0; j < event->desc->nr_fields; j++) { | |
908 | const struct lttng_enum_desc *enum_desc; | |
909 | const struct lttng_event_field *field; | |
910 | struct lttng_enum *curr_enum; | |
911 | ||
912 | field = &(event->desc->fields[j]); | |
218deb69 MD |
913 | switch (field->type.atype) { |
914 | case atype_enum: | |
915 | enum_desc = field->type.u.legacy.basic.enumeration.desc; | |
916 | break; | |
917 | case atype_enum_nestable: | |
918 | enum_desc = field->type.u.enum_nestable.desc; | |
919 | break; | |
920 | default: | |
35ac38cb FD |
921 | continue; |
922 | } | |
35ac38cb FD |
923 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); |
924 | if (curr_enum) { | |
925 | _lttng_enum_destroy(curr_enum); | |
926 | } | |
927 | } | |
928 | ||
929 | /* Destroy event. */ | |
930 | _lttng_event_destroy(event); | |
931 | break; | |
932 | } | |
933 | } | |
934 | } | |
935 | } | |
936 | } | |
937 | ||
8020ceb5 | 938 | /* |
e58095ef MD |
939 | * Create events associated with an enabler (if not already present), |
940 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
941 | */ |
942 | static | |
d871c65b | 943 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 944 | { |
d871c65b | 945 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
946 | struct lttng_event *event; |
947 | ||
d871c65b | 948 | if (!lttng_event_enabler_as_enabler(event_enabler)->enabled) |
de713d8a FD |
949 | goto end; |
950 | ||
e58095ef | 951 | /* First ensure that probe events are created for this enabler. */ |
d871c65b | 952 | lttng_create_event_if_missing(event_enabler); |
e58095ef MD |
953 | |
954 | /* For each event matching enabler in session event list. */ | |
955 | cds_list_for_each_entry(event, &session->events_head, node) { | |
956 | struct lttng_enabler_ref *enabler_ref; | |
957 | ||
d871c65b | 958 | if (!lttng_event_enabler_match_event(event_enabler, event)) |
e58095ef MD |
959 | continue; |
960 | ||
d871c65b FD |
961 | enabler_ref = lttng_enabler_ref(&event->enablers_ref_head, |
962 | lttng_event_enabler_as_enabler(event_enabler)); | |
e58095ef MD |
963 | if (!enabler_ref) { |
964 | /* | |
965 | * If no backward ref, create it. | |
966 | * Add backward ref from event to enabler. | |
967 | */ | |
968 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
969 | if (!enabler_ref) | |
970 | return -ENOMEM; | |
d871c65b FD |
971 | enabler_ref->ref = lttng_event_enabler_as_enabler( |
972 | event_enabler); | |
e58095ef MD |
973 | cds_list_add(&enabler_ref->node, |
974 | &event->enablers_ref_head); | |
8165c8da | 975 | } |
e58095ef MD |
976 | |
977 | /* | |
978 | * Link filter bytecodes if not linked yet. | |
979 | */ | |
d871c65b | 980 | lttng_event_enabler_link_bytecode(event, event_enabler); |
e58095ef MD |
981 | |
982 | /* TODO: merge event context. */ | |
983 | } | |
de713d8a | 984 | end: |
e58095ef MD |
985 | return 0; |
986 | } | |
987 | ||
988 | /* | |
989 | * Called at library load: connect the probe on all enablers matching | |
990 | * this event. | |
5f733922 | 991 | * Called with session mutex held. |
e58095ef | 992 | */ |
5f733922 | 993 | int lttng_fix_pending_events(void) |
e58095ef MD |
994 | { |
995 | struct lttng_session *session; | |
996 | ||
997 | cds_list_for_each_entry(session, &sessions, node) { | |
d871c65b | 998 | lttng_session_lazy_sync_event_enablers(session); |
8020ceb5 | 999 | } |
e58095ef MD |
1000 | return 0; |
1001 | } | |
1002 | ||
246be17e | 1003 | /* |
37dddb65 MD |
1004 | * For each session of the owner thread, execute pending statedump. |
1005 | * Only dump state for the sessions owned by the caller thread, because | |
1006 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 1007 | */ |
3327ac33 | 1008 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
1009 | { |
1010 | struct lttng_session *session; | |
1011 | ||
37dddb65 | 1012 | /* Execute state dump */ |
cf73e0fe | 1013 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
1014 | |
1015 | /* Clear pending state dump */ | |
3327ac33 MD |
1016 | if (ust_lock()) { |
1017 | goto end; | |
1018 | } | |
246be17e | 1019 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
1020 | if (session->owner != owner) |
1021 | continue; | |
1022 | if (!session->statedump_pending) | |
1023 | continue; | |
1024 | session->statedump_pending = 0; | |
246be17e | 1025 | } |
3327ac33 | 1026 | end: |
37dddb65 | 1027 | ust_unlock(); |
3327ac33 | 1028 | return; |
246be17e PW |
1029 | } |
1030 | ||
e58095ef MD |
1031 | /* |
1032 | * Only used internally at session destruction. | |
1033 | */ | |
1034 | static | |
1035 | void _lttng_event_destroy(struct lttng_event *event) | |
1036 | { | |
1037 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1038 | ||
35ac38cb | 1039 | /* Remove from event list. */ |
e58095ef | 1040 | cds_list_del(&event->node); |
35ac38cb FD |
1041 | /* Remove from event hash table. */ |
1042 | cds_hlist_del(&event->hlist); | |
1043 | ||
8020ceb5 | 1044 | lttng_destroy_context(event->ctx); |
f488575f | 1045 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1046 | /* Free event enabler refs */ |
1047 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1048 | &event->enablers_ref_head, node) | |
1049 | free(enabler_ref); | |
b5234c06 | 1050 | free(event); |
8020ceb5 MD |
1051 | } |
1052 | ||
c785c634 MD |
1053 | static |
1054 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1055 | { | |
1056 | cds_list_del(&_enum->node); | |
35ac38cb | 1057 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1058 | free(_enum); |
1059 | } | |
1060 | ||
003fedf4 | 1061 | void lttng_ust_events_exit(void) |
8020ceb5 | 1062 | { |
7dd08bec | 1063 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1064 | |
e58095ef | 1065 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1066 | lttng_session_destroy(session); |
8020ceb5 | 1067 | } |
457a6b58 | 1068 | |
e58095ef MD |
1069 | /* |
1070 | * Enabler management. | |
1071 | */ | |
d871c65b FD |
1072 | struct lttng_event_enabler *lttng_event_enabler_create( |
1073 | enum lttng_enabler_format_type format_type, | |
e58095ef MD |
1074 | struct lttng_ust_event *event_param, |
1075 | struct lttng_channel *chan) | |
457a6b58 | 1076 | { |
d871c65b | 1077 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1078 | |
d871c65b FD |
1079 | event_enabler = zmalloc(sizeof(*event_enabler)); |
1080 | if (!event_enabler) | |
e58095ef | 1081 | return NULL; |
d871c65b FD |
1082 | event_enabler->base.format_type = format_type; |
1083 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1084 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); | |
1085 | memcpy(&event_enabler->base.event_param, event_param, | |
1086 | sizeof(event_enabler->base.event_param)); | |
1087 | event_enabler->chan = chan; | |
e58095ef | 1088 | /* ctx left NULL */ |
d871c65b FD |
1089 | event_enabler->base.enabled = 0; |
1090 | cds_list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head); | |
1091 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1092 | ||
1093 | return event_enabler; | |
457a6b58 MD |
1094 | } |
1095 | ||
d871c65b | 1096 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1097 | { |
d871c65b FD |
1098 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
1099 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1100 | ||
e58095ef | 1101 | return 0; |
457a6b58 | 1102 | } |
457a6b58 | 1103 | |
d871c65b | 1104 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1105 | { |
d871c65b FD |
1106 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1107 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1108 | ||
e58095ef MD |
1109 | return 0; |
1110 | } | |
457a6b58 | 1111 | |
d871c65b FD |
1112 | static |
1113 | void _lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, | |
e58095ef MD |
1114 | struct lttng_ust_filter_bytecode_node *bytecode) |
1115 | { | |
1116 | bytecode->enabler = enabler; | |
1117 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
d871c65b FD |
1118 | } |
1119 | ||
1120 | int lttng_event_enabler_attach_bytecode(struct lttng_event_enabler *event_enabler, | |
1121 | struct lttng_ust_filter_bytecode_node *bytecode) | |
1122 | { | |
1123 | _lttng_enabler_attach_bytecode( | |
1124 | lttng_event_enabler_as_enabler(event_enabler), bytecode); | |
1125 | ||
1126 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
e58095ef | 1127 | return 0; |
0bfb5cbd JI |
1128 | } |
1129 | ||
d871c65b FD |
1130 | static |
1131 | void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
0bfb5cbd JI |
1132 | struct lttng_ust_excluder_node *excluder) |
1133 | { | |
1134 | excluder->enabler = enabler; | |
1135 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
d871c65b FD |
1136 | } |
1137 | ||
1138 | int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler, | |
1139 | struct lttng_ust_excluder_node *excluder) | |
1140 | { | |
1141 | _lttng_enabler_attach_exclusion( | |
1142 | lttng_event_enabler_as_enabler(event_enabler), excluder); | |
1143 | ||
1144 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
0bfb5cbd | 1145 | return 0; |
e58095ef | 1146 | } |
f488575f | 1147 | |
e58095ef | 1148 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1149 | union ust_args *uargs, |
e58095ef MD |
1150 | struct lttng_ctx **ctx, struct lttng_session *session) |
1151 | { | |
457a6b58 | 1152 | /* |
e58095ef MD |
1153 | * We cannot attach a context after trace has been started for a |
1154 | * session because the metadata does not allow expressing this | |
1155 | * information outside of the original channel scope. | |
457a6b58 | 1156 | */ |
e58095ef MD |
1157 | if (session->been_active) |
1158 | return -EPERM; | |
457a6b58 | 1159 | |
e58095ef MD |
1160 | switch (context_param->ctx) { |
1161 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1162 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1163 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1164 | { | |
1165 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1166 | ||
1167 | perf_ctx_param = &context_param->u.perf_counter; | |
1168 | return lttng_add_perf_counter_to_ctx( | |
1169 | perf_ctx_param->type, | |
1170 | perf_ctx_param->config, | |
1171 | perf_ctx_param->name, | |
1172 | ctx); | |
1173 | } | |
e58095ef MD |
1174 | case LTTNG_UST_CONTEXT_VTID: |
1175 | return lttng_add_vtid_to_ctx(ctx); | |
1176 | case LTTNG_UST_CONTEXT_VPID: | |
1177 | return lttng_add_vpid_to_ctx(ctx); | |
1178 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1179 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1180 | case LTTNG_UST_CONTEXT_IP: |
1181 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1182 | case LTTNG_UST_CONTEXT_CPU_ID: |
1183 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1184 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1185 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1186 | ctx); | |
735bef47 MJ |
1187 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1188 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1189 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1190 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1191 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1192 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1193 | case LTTNG_UST_CONTEXT_NET_NS: | |
1194 | return lttng_add_net_ns_to_ctx(ctx); | |
1195 | case LTTNG_UST_CONTEXT_PID_NS: | |
1196 | return lttng_add_pid_ns_to_ctx(ctx); | |
cefef7a7 MJ |
1197 | case LTTNG_UST_CONTEXT_TIME_NS: |
1198 | return lttng_add_time_ns_to_ctx(ctx); | |
735bef47 MJ |
1199 | case LTTNG_UST_CONTEXT_USER_NS: |
1200 | return lttng_add_user_ns_to_ctx(ctx); | |
1201 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1202 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1203 | case LTTNG_UST_CONTEXT_VUID: |
1204 | return lttng_add_vuid_to_ctx(ctx); | |
1205 | case LTTNG_UST_CONTEXT_VEUID: | |
1206 | return lttng_add_veuid_to_ctx(ctx); | |
1207 | case LTTNG_UST_CONTEXT_VSUID: | |
1208 | return lttng_add_vsuid_to_ctx(ctx); | |
1209 | case LTTNG_UST_CONTEXT_VGID: | |
1210 | return lttng_add_vgid_to_ctx(ctx); | |
1211 | case LTTNG_UST_CONTEXT_VEGID: | |
1212 | return lttng_add_vegid_to_ctx(ctx); | |
1213 | case LTTNG_UST_CONTEXT_VSGID: | |
1214 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1215 | default: |
1216 | return -EINVAL; | |
457a6b58 | 1217 | } |
457a6b58 MD |
1218 | } |
1219 | ||
d871c65b | 1220 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
e58095ef | 1221 | struct lttng_ust_context *context_param) |
457a6b58 | 1222 | { |
e58095ef | 1223 | return -ENOSYS; |
457a6b58 MD |
1224 | } |
1225 | ||
d871c65b | 1226 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1227 | { |
d871c65b FD |
1228 | if (!event_enabler) { |
1229 | return; | |
0f63324a | 1230 | } |
d871c65b | 1231 | cds_list_del(&event_enabler->node); |
0f63324a | 1232 | |
d871c65b | 1233 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef | 1234 | |
d871c65b FD |
1235 | lttng_destroy_context(event_enabler->ctx); |
1236 | free(event_enabler); | |
457a6b58 MD |
1237 | } |
1238 | ||
e58095ef | 1239 | /* |
d871c65b | 1240 | * lttng_session_sync_event_enablers should be called just before starting a |
e58095ef MD |
1241 | * session. |
1242 | */ | |
457a6b58 | 1243 | static |
d871c65b | 1244 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1245 | { |
d871c65b | 1246 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1247 | struct lttng_event *event; |
457a6b58 | 1248 | |
d871c65b FD |
1249 | cds_list_for_each_entry(event_enabler, &session->enablers_head, node) |
1250 | lttng_event_enabler_ref_events(event_enabler); | |
e58095ef MD |
1251 | /* |
1252 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1253 | * and its channel and session transient states are enabled, we |
1254 | * enable the event, else we disable it. | |
e58095ef MD |
1255 | */ |
1256 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1257 | struct lttng_enabler_ref *enabler_ref; | |
1258 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1259 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1260 | |
1261 | /* Enable events */ | |
1262 | cds_list_for_each_entry(enabler_ref, | |
1263 | &event->enablers_ref_head, node) { | |
1264 | if (enabler_ref->ref->enabled) { | |
1265 | enabled = 1; | |
1266 | break; | |
1267 | } | |
1268 | } | |
ac6b4ac6 MD |
1269 | /* |
1270 | * Enabled state is based on union of enablers, with | |
1271 | * intesection of session and channel transient enable | |
1272 | * states. | |
1273 | */ | |
1274 | enabled = enabled && session->tstate && event->chan->tstate; | |
1275 | ||
1276 | CMM_STORE_SHARED(event->enabled, enabled); | |
1277 | /* | |
1278 | * Sync tracepoint registration with event enabled | |
1279 | * state. | |
1280 | */ | |
1281 | if (enabled) { | |
1282 | if (!event->registered) | |
1283 | register_event(event); | |
1284 | } else { | |
1285 | if (event->registered) | |
1286 | unregister_event(event); | |
1287 | } | |
457a6b58 | 1288 | |
1f49fc05 | 1289 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1290 | cds_list_for_each_entry(enabler_ref, |
1291 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1292 | if (enabler_ref->ref->enabled |
1293 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1294 | has_enablers_without_bytecode = 1; |
1295 | break; | |
1296 | } | |
1297 | } | |
1298 | event->has_enablers_without_bytecode = | |
1299 | has_enablers_without_bytecode; | |
1300 | ||
e58095ef MD |
1301 | /* Enable filters */ |
1302 | cds_list_for_each_entry(runtime, | |
1303 | &event->bytecode_runtime_head, node) { | |
1304 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
1305 | } |
1306 | } | |
baa1e0bc | 1307 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1308 | } |
1309 | ||
e58095ef MD |
1310 | /* |
1311 | * Apply enablers to session events, adding events to session if need | |
1312 | * be. It is required after each modification applied to an active | |
1313 | * session, and right before session "start". | |
1314 | * "lazy" sync means we only sync if required. | |
1315 | */ | |
1316 | static | |
d871c65b | 1317 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1318 | { |
e58095ef MD |
1319 | /* We can skip if session is not active */ |
1320 | if (!session->active) | |
1321 | return; | |
d871c65b | 1322 | lttng_session_sync_event_enablers(session); |
457a6b58 | 1323 | } |
53569322 MD |
1324 | |
1325 | /* | |
1326 | * Update all sessions with the given app context. | |
1327 | * Called with ust lock held. | |
1328 | * This is invoked when an application context gets loaded/unloaded. It | |
1329 | * ensures the context callbacks are in sync with the application | |
1330 | * context (either app context callbacks, or dummy callbacks). | |
1331 | */ | |
1332 | void lttng_ust_context_set_session_provider(const char *name, | |
1333 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1334 | void (*record)(struct lttng_ctx_field *field, | |
1335 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1336 | struct lttng_channel *chan), | |
1337 | void (*get_value)(struct lttng_ctx_field *field, | |
1338 | struct lttng_ctx_value *value)) | |
1339 | { | |
1340 | struct lttng_session *session; | |
1341 | ||
1342 | cds_list_for_each_entry(session, &sessions, node) { | |
1343 | struct lttng_channel *chan; | |
1344 | struct lttng_event *event; | |
1345 | int ret; | |
1346 | ||
1347 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1348 | name, get_size, record, get_value); | |
1349 | if (ret) | |
1350 | abort(); | |
1351 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1352 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1353 | name, get_size, record, get_value); | |
1354 | if (ret) | |
1355 | abort(); | |
1356 | } | |
1357 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1358 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1359 | name, get_size, record, get_value); | |
1360 | if (ret) | |
1361 | abort(); | |
1362 | } | |
1363 | } | |
1364 | } |