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" | |
cf73e0fe | 57 | #include "lttng-ust-statedump.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 | 251 | |
8020ceb5 MD |
252 | /* |
253 | * Snapshot the number of events per channel to know the type of header | |
254 | * we need to use. | |
255 | */ | |
e58095ef | 256 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 257 | const struct lttng_ctx *ctx; |
83e43212 | 258 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 259 | size_t nr_fields = 0; |
6ca18e66 | 260 | uint32_t chan_id; |
32ce8569 MD |
261 | |
262 | /* don't change it if session stop/restart */ | |
8020ceb5 | 263 | if (chan->header_type) |
32ce8569 MD |
264 | continue; |
265 | ctx = chan->ctx; | |
266 | if (ctx) { | |
267 | nr_fields = ctx->nr_fields; | |
83e43212 | 268 | fields = ctx->fields; |
32ce8569 MD |
269 | } |
270 | ret = ustcomm_register_channel(notify_socket, | |
271 | session->objd, | |
272 | chan->objd, | |
273 | nr_fields, | |
274 | fields, | |
6ca18e66 | 275 | &chan_id, |
32ce8569 | 276 | &chan->header_type); |
b869b5ae MD |
277 | if (ret) { |
278 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 279 | return ret; |
b869b5ae | 280 | } |
6ca18e66 MD |
281 | if (chan_id != chan->id) { |
282 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
283 | chan_id, chan->id); | |
284 | return -EINVAL; | |
285 | } | |
8020ceb5 MD |
286 | } |
287 | ||
5c055275 FD |
288 | /* We need to sync enablers with session before activation. */ |
289 | lttng_session_sync_enablers(session); | |
290 | ||
ac6b4ac6 | 291 | /* Set atomically the state to "active" */ |
b5234c06 MD |
292 | CMM_ACCESS_ONCE(session->active) = 1; |
293 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 294 | |
246be17e PW |
295 | session->statedump_pending = 1; |
296 | lttng_ust_sockinfo_session_enabled(session->owner); | |
8020ceb5 | 297 | end: |
8020ceb5 MD |
298 | return ret; |
299 | } | |
300 | ||
7dd08bec | 301 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
302 | { |
303 | int ret = 0; | |
304 | ||
8020ceb5 MD |
305 | if (!session->active) { |
306 | ret = -EBUSY; | |
307 | goto end; | |
308 | } | |
ac6b4ac6 | 309 | /* Set atomically the state to "inactive" */ |
b5234c06 | 310 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
311 | |
312 | /* Set transient enabler state to "disabled" */ | |
313 | session->tstate = 0; | |
314 | lttng_session_sync_enablers(session); | |
8020ceb5 | 315 | end: |
8020ceb5 MD |
316 | return ret; |
317 | } | |
318 | ||
7dd08bec | 319 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 320 | { |
ac6b4ac6 | 321 | int ret = 0; |
976fe9ea | 322 | |
ac6b4ac6 MD |
323 | if (channel->enabled) { |
324 | ret = -EBUSY; | |
325 | goto end; | |
326 | } | |
327 | /* Set transient enabler state to "enabled" */ | |
328 | channel->tstate = 1; | |
329 | lttng_session_sync_enablers(channel->session); | |
330 | /* Set atomically the state to "enabled" */ | |
331 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
332 | end: | |
333 | return ret; | |
976fe9ea MD |
334 | } |
335 | ||
7dd08bec | 336 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 337 | { |
ac6b4ac6 | 338 | int ret = 0; |
976fe9ea | 339 | |
ac6b4ac6 MD |
340 | if (!channel->enabled) { |
341 | ret = -EBUSY; | |
342 | goto end; | |
343 | } | |
344 | /* Set atomically the state to "disabled" */ | |
345 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
346 | /* Set transient enabler state to "enabled" */ | |
347 | channel->tstate = 0; | |
348 | lttng_session_sync_enablers(channel->session); | |
349 | end: | |
350 | return ret; | |
976fe9ea MD |
351 | } |
352 | ||
8020ceb5 MD |
353 | /* |
354 | * Supports event creation while tracing session is active. | |
355 | */ | |
e58095ef MD |
356 | static |
357 | int lttng_event_create(const struct lttng_event_desc *desc, | |
358 | struct lttng_channel *chan) | |
8020ceb5 | 359 | { |
e58095ef | 360 | const char *event_name = desc->name; |
7dd08bec | 361 | struct lttng_event *event; |
32ce8569 | 362 | struct lttng_session *session = chan->session; |
d56fa719 MD |
363 | struct cds_hlist_head *head; |
364 | struct cds_hlist_node *node; | |
576599a0 | 365 | int ret = 0; |
d56fa719 MD |
366 | size_t name_len = strlen(event_name); |
367 | uint32_t hash; | |
32ce8569 MD |
368 | int notify_socket, loglevel; |
369 | const char *uri; | |
8020ceb5 | 370 | |
d56fa719 MD |
371 | hash = jhash(event_name, name_len, 0); |
372 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
373 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef | 374 | assert(event->desc); |
d970f72e MD |
375 | if (!strncmp(event->desc->name, desc->name, |
376 | LTTNG_UST_SYM_NAME_LEN - 1) | |
377 | && chan == event->chan) { | |
576599a0 | 378 | ret = -EEXIST; |
8020ceb5 | 379 | goto exist; |
576599a0 MD |
380 | } |
381 | } | |
457a6b58 | 382 | |
32ce8569 MD |
383 | notify_socket = lttng_get_notify_socket(session->owner); |
384 | if (notify_socket < 0) { | |
385 | ret = notify_socket; | |
386 | goto socket_error; | |
387 | } | |
388 | ||
457a6b58 MD |
389 | /* |
390 | * Check if loglevel match. Refuse to connect event if not. | |
391 | */ | |
7dd08bec | 392 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
393 | if (!event) { |
394 | ret = -ENOMEM; | |
8020ceb5 | 395 | goto cache_error; |
576599a0 | 396 | } |
8020ceb5 | 397 | event->chan = chan; |
e58095ef | 398 | |
ac6b4ac6 MD |
399 | /* Event will be enabled by enabler sync. */ |
400 | event->enabled = 0; | |
401 | event->registered = 0; | |
e58095ef MD |
402 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
403 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
404 | event->desc = desc; | |
32ce8569 MD |
405 | |
406 | if (desc->loglevel) | |
407 | loglevel = *(*event->desc->loglevel); | |
408 | else | |
409 | loglevel = TRACE_DEFAULT; | |
410 | if (desc->u.ext.model_emf_uri) | |
411 | uri = *(desc->u.ext.model_emf_uri); | |
412 | else | |
413 | uri = NULL; | |
414 | ||
13b21cd6 MD |
415 | /* Fetch event ID from sessiond */ |
416 | ret = ustcomm_register_event(notify_socket, | |
417 | session->objd, | |
418 | chan->objd, | |
419 | event_name, | |
420 | loglevel, | |
421 | desc->signature, | |
422 | desc->nr_fields, | |
423 | desc->fields, | |
424 | uri, | |
425 | &event->id); | |
426 | if (ret < 0) { | |
427 | DBG("Error (%d) registering event to sessiond", ret); | |
428 | goto sessiond_register_error; | |
32ce8569 | 429 | } |
2b213b16 | 430 | |
7dd08bec | 431 | /* Populate lttng_event structure before tracepoint registration. */ |
b5234c06 | 432 | cmm_smp_wmb(); |
e58095ef | 433 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 434 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 435 | return 0; |
8020ceb5 | 436 | |
32ce8569 | 437 | sessiond_register_error: |
b5234c06 | 438 | free(event); |
8020ceb5 | 439 | cache_error: |
32ce8569 | 440 | socket_error: |
8020ceb5 | 441 | exist: |
576599a0 | 442 | return ret; |
8020ceb5 MD |
443 | } |
444 | ||
e58095ef MD |
445 | static |
446 | int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, | |
447 | struct lttng_enabler *enabler) | |
448 | { | |
449 | int loglevel = 0; | |
7e2e405c | 450 | unsigned int has_loglevel = 0; |
e58095ef MD |
451 | |
452 | assert(enabler->type == LTTNG_ENABLER_WILDCARD); | |
453 | /* Compare excluding final '*' */ | |
454 | if (strncmp(desc->name, enabler->event_param.name, | |
455 | strlen(enabler->event_param.name) - 1)) | |
456 | return 0; | |
457 | if (desc->loglevel) { | |
458 | loglevel = *(*desc->loglevel); | |
459 | has_loglevel = 1; | |
460 | } | |
461 | if (!lttng_loglevel_match(loglevel, | |
462 | has_loglevel, | |
463 | enabler->event_param.loglevel_type, | |
464 | enabler->event_param.loglevel)) | |
465 | return 0; | |
466 | return 1; | |
467 | } | |
468 | ||
469 | static | |
470 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
471 | struct lttng_enabler *enabler) | |
472 | { | |
473 | int loglevel = 0; | |
474 | unsigned int has_loglevel = 0; | |
475 | ||
476 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
477 | if (strcmp(desc->name, enabler->event_param.name)) | |
478 | return 0; | |
479 | if (desc->loglevel) { | |
480 | loglevel = *(*desc->loglevel); | |
481 | has_loglevel = 1; | |
482 | } | |
483 | if (!lttng_loglevel_match(loglevel, | |
484 | has_loglevel, | |
485 | enabler->event_param.loglevel_type, | |
486 | enabler->event_param.loglevel)) | |
487 | return 0; | |
488 | return 1; | |
489 | } | |
490 | ||
491 | static | |
492 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
493 | struct lttng_enabler *enabler) | |
494 | { | |
ed5b5bbd JI |
495 | struct lttng_ust_excluder_node *excluder; |
496 | ||
497 | /* If event matches with an excluder, return 'does not match' */ | |
498 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
499 | int count; | |
500 | ||
501 | for (count = 0; count < excluder->excluder.count; count++) { | |
502 | int found, len; | |
503 | char *excluder_name; | |
504 | ||
505 | excluder_name = (char *) (excluder->excluder.names) | |
506 | + count * LTTNG_UST_SYM_NAME_LEN; | |
507 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
508 | if (len > 0 && excluder_name[len - 1] == '*') { | |
509 | found = !strncmp(desc->name, excluder_name, | |
510 | len - 1); | |
511 | } else { | |
512 | found = !strncmp(desc->name, excluder_name, | |
513 | LTTNG_UST_SYM_NAME_LEN - 1); | |
514 | } | |
515 | if (found) { | |
516 | return 0; | |
517 | } | |
518 | } | |
519 | } | |
e58095ef MD |
520 | switch (enabler->type) { |
521 | case LTTNG_ENABLER_WILDCARD: | |
522 | return lttng_desc_match_wildcard_enabler(desc, enabler); | |
523 | case LTTNG_ENABLER_EVENT: | |
524 | return lttng_desc_match_event_enabler(desc, enabler); | |
525 | default: | |
526 | return -EINVAL; | |
527 | } | |
528 | } | |
529 | ||
530 | static | |
531 | int lttng_event_match_enabler(struct lttng_event *event, | |
532 | struct lttng_enabler *enabler) | |
533 | { | |
d970f72e MD |
534 | if (lttng_desc_match_enabler(event->desc, enabler) |
535 | && event->chan == enabler->chan) | |
536 | return 1; | |
537 | else | |
538 | return 0; | |
e58095ef MD |
539 | } |
540 | ||
541 | static | |
542 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
543 | struct lttng_enabler *enabler) | |
544 | { | |
545 | struct lttng_enabler_ref *enabler_ref; | |
546 | ||
547 | cds_list_for_each_entry(enabler_ref, | |
548 | &event->enablers_ref_head, node) { | |
549 | if (enabler_ref->ref == enabler) | |
550 | return enabler_ref; | |
551 | } | |
552 | return NULL; | |
553 | } | |
554 | ||
8020ceb5 | 555 | /* |
e58095ef MD |
556 | * Create struct lttng_event if it is missing and present in the list of |
557 | * tracepoint probes. | |
8020ceb5 | 558 | */ |
e58095ef MD |
559 | static |
560 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 561 | { |
e58095ef MD |
562 | struct lttng_session *session = enabler->chan->session; |
563 | struct lttng_probe_desc *probe_desc; | |
564 | const struct lttng_event_desc *desc; | |
565 | struct lttng_event *event; | |
566 | int i; | |
567 | struct cds_list_head *probe_list; | |
568 | ||
569 | probe_list = lttng_get_probe_list_head(); | |
570 | /* | |
571 | * For each probe event, if we find that a probe event matches | |
572 | * our enabler, create an associated lttng_event if not | |
573 | * already present. | |
574 | */ | |
575 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
576 | for (i = 0; i < probe_desc->nr_events; i++) { | |
577 | int found = 0, ret; | |
d56fa719 MD |
578 | struct cds_hlist_head *head; |
579 | struct cds_hlist_node *node; | |
580 | const char *event_name; | |
581 | size_t name_len; | |
582 | uint32_t hash; | |
e58095ef MD |
583 | |
584 | desc = probe_desc->event_desc[i]; | |
585 | if (!lttng_desc_match_enabler(desc, enabler)) | |
586 | continue; | |
d56fa719 MD |
587 | event_name = desc->name; |
588 | name_len = strlen(event_name); | |
e58095ef MD |
589 | |
590 | /* | |
d56fa719 | 591 | * Check if already created. |
e58095ef | 592 | */ |
d56fa719 MD |
593 | hash = jhash(event_name, name_len, 0); |
594 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
595 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
d970f72e MD |
596 | if (event->desc == desc |
597 | && event->chan == enabler->chan) | |
e58095ef MD |
598 | found = 1; |
599 | } | |
600 | if (found) | |
601 | continue; | |
602 | ||
603 | /* | |
604 | * We need to create an event for this | |
605 | * event probe. | |
606 | */ | |
607 | ret = lttng_event_create(probe_desc->event_desc[i], | |
608 | enabler->chan); | |
609 | if (ret) { | |
32ce8569 MD |
610 | DBG("Unable to create event %s, error %d\n", |
611 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 612 | } |
8165c8da | 613 | } |
8020ceb5 | 614 | } |
8020ceb5 MD |
615 | } |
616 | ||
617 | /* | |
e58095ef MD |
618 | * Create events associated with an enabler (if not already present), |
619 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
620 | */ |
621 | static | |
e58095ef | 622 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 623 | { |
e58095ef MD |
624 | struct lttng_session *session = enabler->chan->session; |
625 | struct lttng_event *event; | |
626 | ||
627 | /* First ensure that probe events are created for this enabler. */ | |
628 | lttng_create_event_if_missing(enabler); | |
629 | ||
630 | /* For each event matching enabler in session event list. */ | |
631 | cds_list_for_each_entry(event, &session->events_head, node) { | |
632 | struct lttng_enabler_ref *enabler_ref; | |
633 | ||
634 | if (!lttng_event_match_enabler(event, enabler)) | |
635 | continue; | |
636 | ||
637 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
638 | if (!enabler_ref) { | |
639 | /* | |
640 | * If no backward ref, create it. | |
641 | * Add backward ref from event to enabler. | |
642 | */ | |
643 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
644 | if (!enabler_ref) | |
645 | return -ENOMEM; | |
646 | enabler_ref->ref = enabler; | |
647 | cds_list_add(&enabler_ref->node, | |
648 | &event->enablers_ref_head); | |
8165c8da | 649 | } |
e58095ef MD |
650 | |
651 | /* | |
652 | * Link filter bytecodes if not linked yet. | |
653 | */ | |
654 | lttng_enabler_event_link_bytecode(event, enabler); | |
655 | ||
656 | /* TODO: merge event context. */ | |
657 | } | |
658 | return 0; | |
659 | } | |
660 | ||
661 | /* | |
662 | * Called at library load: connect the probe on all enablers matching | |
663 | * this event. | |
5f733922 | 664 | * Called with session mutex held. |
e58095ef | 665 | */ |
5f733922 | 666 | int lttng_fix_pending_events(void) |
e58095ef MD |
667 | { |
668 | struct lttng_session *session; | |
669 | ||
670 | cds_list_for_each_entry(session, &sessions, node) { | |
671 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 672 | } |
e58095ef MD |
673 | return 0; |
674 | } | |
675 | ||
246be17e | 676 | /* |
37dddb65 MD |
677 | * For each session of the owner thread, execute pending statedump. |
678 | * Only dump state for the sessions owned by the caller thread, because | |
679 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 680 | */ |
3327ac33 | 681 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
682 | { |
683 | struct lttng_session *session; | |
684 | ||
37dddb65 | 685 | /* Execute state dump */ |
cf73e0fe | 686 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
687 | |
688 | /* Clear pending state dump */ | |
3327ac33 MD |
689 | if (ust_lock()) { |
690 | goto end; | |
691 | } | |
246be17e | 692 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
693 | if (session->owner != owner) |
694 | continue; | |
695 | if (!session->statedump_pending) | |
696 | continue; | |
697 | session->statedump_pending = 0; | |
246be17e | 698 | } |
3327ac33 | 699 | end: |
37dddb65 | 700 | ust_unlock(); |
3327ac33 | 701 | return; |
246be17e PW |
702 | } |
703 | ||
e58095ef MD |
704 | /* |
705 | * Only used internally at session destruction. | |
706 | */ | |
707 | static | |
708 | void _lttng_event_destroy(struct lttng_event *event) | |
709 | { | |
710 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
711 | ||
e58095ef | 712 | cds_list_del(&event->node); |
8020ceb5 | 713 | lttng_destroy_context(event->ctx); |
f488575f | 714 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
715 | /* Free event enabler refs */ |
716 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
717 | &event->enablers_ref_head, node) | |
718 | free(enabler_ref); | |
b5234c06 | 719 | free(event); |
8020ceb5 MD |
720 | } |
721 | ||
003fedf4 | 722 | void lttng_ust_events_exit(void) |
8020ceb5 | 723 | { |
7dd08bec | 724 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 725 | |
e58095ef | 726 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 727 | lttng_session_destroy(session); |
8020ceb5 | 728 | } |
457a6b58 | 729 | |
e58095ef MD |
730 | /* |
731 | * Enabler management. | |
732 | */ | |
733 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
734 | struct lttng_ust_event *event_param, | |
735 | struct lttng_channel *chan) | |
457a6b58 | 736 | { |
e58095ef MD |
737 | struct lttng_enabler *enabler; |
738 | ||
739 | enabler = zmalloc(sizeof(*enabler)); | |
740 | if (!enabler) | |
741 | return NULL; | |
742 | enabler->type = type; | |
743 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
0f63324a | 744 | CDS_INIT_LIST_HEAD(&enabler->excluder_head); |
e58095ef MD |
745 | memcpy(&enabler->event_param, event_param, |
746 | sizeof(enabler->event_param)); | |
747 | enabler->chan = chan; | |
748 | /* ctx left NULL */ | |
89f26d57 | 749 | enabler->enabled = 0; |
e58095ef MD |
750 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); |
751 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
752 | return enabler; | |
457a6b58 MD |
753 | } |
754 | ||
e58095ef | 755 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 756 | { |
e58095ef MD |
757 | enabler->enabled = 1; |
758 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
759 | return 0; | |
457a6b58 | 760 | } |
457a6b58 | 761 | |
e58095ef | 762 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 763 | { |
e58095ef MD |
764 | enabler->enabled = 0; |
765 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
766 | return 0; | |
767 | } | |
457a6b58 | 768 | |
e58095ef MD |
769 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
770 | struct lttng_ust_filter_bytecode_node *bytecode) | |
771 | { | |
772 | bytecode->enabler = enabler; | |
773 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
774 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
775 | return 0; | |
0bfb5cbd JI |
776 | } |
777 | ||
778 | int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
779 | struct lttng_ust_excluder_node *excluder) | |
780 | { | |
781 | excluder->enabler = enabler; | |
782 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
783 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
784 | return 0; | |
e58095ef | 785 | } |
f488575f | 786 | |
e58095ef MD |
787 | int lttng_attach_context(struct lttng_ust_context *context_param, |
788 | struct lttng_ctx **ctx, struct lttng_session *session) | |
789 | { | |
457a6b58 | 790 | /* |
e58095ef MD |
791 | * We cannot attach a context after trace has been started for a |
792 | * session because the metadata does not allow expressing this | |
793 | * information outside of the original channel scope. | |
457a6b58 | 794 | */ |
e58095ef MD |
795 | if (session->been_active) |
796 | return -EPERM; | |
457a6b58 | 797 | |
e58095ef MD |
798 | switch (context_param->ctx) { |
799 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
800 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
801 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
802 | { | |
803 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
804 | ||
805 | perf_ctx_param = &context_param->u.perf_counter; | |
806 | return lttng_add_perf_counter_to_ctx( | |
807 | perf_ctx_param->type, | |
808 | perf_ctx_param->config, | |
809 | perf_ctx_param->name, | |
810 | ctx); | |
811 | } | |
e58095ef MD |
812 | case LTTNG_UST_CONTEXT_VTID: |
813 | return lttng_add_vtid_to_ctx(ctx); | |
814 | case LTTNG_UST_CONTEXT_VPID: | |
815 | return lttng_add_vpid_to_ctx(ctx); | |
816 | case LTTNG_UST_CONTEXT_PROCNAME: | |
817 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
818 | case LTTNG_UST_CONTEXT_IP: |
819 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
820 | case LTTNG_UST_CONTEXT_CPU_ID: |
821 | return lttng_add_cpu_id_to_ctx(ctx); | |
e58095ef MD |
822 | default: |
823 | return -EINVAL; | |
457a6b58 | 824 | } |
457a6b58 MD |
825 | } |
826 | ||
e58095ef MD |
827 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
828 | struct lttng_ust_context *context_param) | |
457a6b58 | 829 | { |
e58095ef MD |
830 | #if 0 // disabled for now. |
831 | struct lttng_session *session = enabler->chan->session; | |
832 | int ret; | |
457a6b58 | 833 | |
e58095ef MD |
834 | ret = lttng_attach_context(context_param, &enabler->ctx, |
835 | session); | |
836 | if (ret) | |
837 | return ret; | |
838 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
839 | #endif | |
840 | return -ENOSYS; | |
457a6b58 MD |
841 | } |
842 | ||
e58095ef MD |
843 | static |
844 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 845 | { |
e58095ef | 846 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
0f63324a | 847 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
457a6b58 | 848 | |
e58095ef MD |
849 | /* Destroy filter bytecode */ |
850 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
851 | &enabler->filter_bytecode_head, node) { | |
852 | free(filter_node); | |
457a6b58 | 853 | } |
e58095ef | 854 | |
0f63324a JI |
855 | /* Destroy excluders */ |
856 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
857 | &enabler->excluder_head, node) { | |
858 | free(excluder_node); | |
859 | } | |
860 | ||
e58095ef MD |
861 | /* Destroy contexts */ |
862 | lttng_destroy_context(enabler->ctx); | |
863 | ||
864 | cds_list_del(&enabler->node); | |
865 | free(enabler); | |
457a6b58 MD |
866 | } |
867 | ||
e58095ef MD |
868 | /* |
869 | * lttng_session_sync_enablers should be called just before starting a | |
870 | * session. | |
871 | */ | |
457a6b58 | 872 | static |
e58095ef | 873 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 874 | { |
e58095ef MD |
875 | struct lttng_enabler *enabler; |
876 | struct lttng_event *event; | |
457a6b58 | 877 | |
e58095ef MD |
878 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
879 | lttng_enabler_ref_events(enabler); | |
880 | /* | |
881 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
882 | * and its channel and session transient states are enabled, we |
883 | * enable the event, else we disable it. | |
e58095ef MD |
884 | */ |
885 | cds_list_for_each_entry(event, &session->events_head, node) { | |
886 | struct lttng_enabler_ref *enabler_ref; | |
887 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 888 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
889 | |
890 | /* Enable events */ | |
891 | cds_list_for_each_entry(enabler_ref, | |
892 | &event->enablers_ref_head, node) { | |
893 | if (enabler_ref->ref->enabled) { | |
894 | enabled = 1; | |
895 | break; | |
896 | } | |
897 | } | |
ac6b4ac6 MD |
898 | /* |
899 | * Enabled state is based on union of enablers, with | |
900 | * intesection of session and channel transient enable | |
901 | * states. | |
902 | */ | |
903 | enabled = enabled && session->tstate && event->chan->tstate; | |
904 | ||
905 | CMM_STORE_SHARED(event->enabled, enabled); | |
906 | /* | |
907 | * Sync tracepoint registration with event enabled | |
908 | * state. | |
909 | */ | |
910 | if (enabled) { | |
911 | if (!event->registered) | |
912 | register_event(event); | |
913 | } else { | |
914 | if (event->registered) | |
915 | unregister_event(event); | |
916 | } | |
457a6b58 | 917 | |
1f49fc05 | 918 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
919 | cds_list_for_each_entry(enabler_ref, |
920 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
921 | if (enabler_ref->ref->enabled |
922 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
923 | has_enablers_without_bytecode = 1; |
924 | break; | |
925 | } | |
926 | } | |
927 | event->has_enablers_without_bytecode = | |
928 | has_enablers_without_bytecode; | |
929 | ||
e58095ef MD |
930 | /* Enable filters */ |
931 | cds_list_for_each_entry(runtime, | |
932 | &event->bytecode_runtime_head, node) { | |
933 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
934 | } |
935 | } | |
457a6b58 MD |
936 | } |
937 | ||
e58095ef MD |
938 | /* |
939 | * Apply enablers to session events, adding events to session if need | |
940 | * be. It is required after each modification applied to an active | |
941 | * session, and right before session "start". | |
942 | * "lazy" sync means we only sync if required. | |
943 | */ | |
944 | static | |
945 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 946 | { |
e58095ef MD |
947 | /* We can skip if session is not active */ |
948 | if (!session->active) | |
949 | return; | |
950 | lttng_session_sync_enablers(session); | |
457a6b58 | 951 | } |