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