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 | /* | |
63 | * The sessions mutex is the centralized mutex across UST tracing | |
17dfb34b MD |
64 | * control and probe registration. All operations within this file are |
65 | * called by the communication thread, under ust_lock protection. | |
8165c8da | 66 | */ |
2b2d6ff7 | 67 | static pthread_mutex_t sessions_mutex = PTHREAD_MUTEX_INITIALIZER; |
8165c8da | 68 | |
17dfb34b | 69 | void ust_lock(void) |
8165c8da MD |
70 | { |
71 | pthread_mutex_lock(&sessions_mutex); | |
72 | } | |
73 | ||
17dfb34b | 74 | void ust_unlock(void) |
8165c8da MD |
75 | { |
76 | pthread_mutex_unlock(&sessions_mutex); | |
77 | } | |
78 | ||
b5234c06 | 79 | static CDS_LIST_HEAD(sessions); |
8165c8da | 80 | |
37dddb65 MD |
81 | struct cds_list_head *_lttng_get_sessions(void) |
82 | { | |
83 | return &sessions; | |
84 | } | |
85 | ||
7dd08bec | 86 | static void _lttng_event_destroy(struct lttng_event *event); |
8020ceb5 | 87 | |
e58095ef MD |
88 | static |
89 | void lttng_session_lazy_sync_enablers(struct lttng_session *session); | |
90 | static | |
91 | void lttng_session_sync_enablers(struct lttng_session *session); | |
92 | static | |
93 | void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
94 | ||
6715d7d1 MD |
95 | /* |
96 | * Called with ust lock held. | |
97 | */ | |
98 | int lttng_session_active(void) | |
99 | { | |
100 | struct lttng_session *iter; | |
101 | ||
102 | cds_list_for_each_entry(iter, &sessions, node) { | |
103 | if (iter->active) | |
104 | return 1; | |
105 | } | |
106 | return 0; | |
107 | } | |
108 | ||
e58095ef MD |
109 | static |
110 | int lttng_loglevel_match(int loglevel, | |
111 | unsigned int has_loglevel, | |
457a6b58 MD |
112 | enum lttng_ust_loglevel_type req_type, |
113 | int req_loglevel) | |
114 | { | |
457a6b58 MD |
115 | if (req_type == LTTNG_UST_LOGLEVEL_ALL) |
116 | return 1; | |
e58095ef MD |
117 | if (!has_loglevel) |
118 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
119 | switch (req_type) { |
120 | case LTTNG_UST_LOGLEVEL_RANGE: | |
e58095ef | 121 | if (loglevel <= req_loglevel || req_loglevel == -1) |
457a6b58 MD |
122 | return 1; |
123 | else | |
124 | return 0; | |
125 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
e58095ef | 126 | if (loglevel == req_loglevel || req_loglevel == -1) |
457a6b58 MD |
127 | return 1; |
128 | else | |
129 | return 0; | |
130 | case LTTNG_UST_LOGLEVEL_ALL: | |
131 | default: | |
132 | return 1; | |
133 | } | |
134 | } | |
135 | ||
8020ceb5 MD |
136 | void synchronize_trace(void) |
137 | { | |
8020ceb5 | 138 | synchronize_rcu(); |
8020ceb5 MD |
139 | } |
140 | ||
7dd08bec | 141 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 142 | { |
7dd08bec | 143 | struct lttng_session *session; |
74d81a6c | 144 | int i; |
8020ceb5 | 145 | |
7dd08bec | 146 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
147 | if (!session) |
148 | return NULL; | |
e58095ef MD |
149 | CDS_INIT_LIST_HEAD(&session->chan_head); |
150 | CDS_INIT_LIST_HEAD(&session->events_head); | |
151 | CDS_INIT_LIST_HEAD(&session->enablers_head); | |
d56fa719 MD |
152 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
153 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
e58095ef | 154 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
155 | return session; |
156 | } | |
157 | ||
74d81a6c MD |
158 | /* |
159 | * Only used internally at session destruction. | |
160 | */ | |
161 | static | |
162 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
163 | { | |
164 | struct channel *chan; | |
165 | struct lttng_ust_shm_handle *handle; | |
166 | ||
167 | cds_list_del(<tng_chan->node); | |
168 | lttng_destroy_context(lttng_chan->ctx); | |
169 | chan = lttng_chan->chan; | |
170 | handle = lttng_chan->handle; | |
171 | /* | |
172 | * note: lttng_chan is private data contained within handle. It | |
173 | * will be freed along with the handle. | |
174 | */ | |
175 | channel_destroy(chan, handle, 0); | |
176 | } | |
177 | ||
ac6b4ac6 MD |
178 | static |
179 | void register_event(struct lttng_event *event) | |
180 | { | |
181 | int ret; | |
182 | const struct lttng_event_desc *desc; | |
183 | ||
184 | assert(event->registered == 0); | |
185 | desc = event->desc; | |
186 | ret = __tracepoint_probe_register(desc->name, | |
187 | desc->probe_callback, | |
188 | event, desc->signature); | |
189 | WARN_ON_ONCE(ret); | |
190 | if (!ret) | |
191 | event->registered = 1; | |
192 | } | |
193 | ||
194 | static | |
195 | void unregister_event(struct lttng_event *event) | |
196 | { | |
197 | int ret; | |
198 | const struct lttng_event_desc *desc; | |
199 | ||
200 | assert(event->registered == 1); | |
201 | desc = event->desc; | |
202 | ret = __tracepoint_probe_unregister(desc->name, | |
203 | desc->probe_callback, | |
204 | event); | |
205 | WARN_ON_ONCE(ret); | |
206 | if (!ret) | |
207 | event->registered = 0; | |
208 | } | |
209 | ||
210 | /* | |
211 | * Only used internally at session destruction. | |
212 | */ | |
213 | static | |
214 | void _lttng_event_unregister(struct lttng_event *event) | |
215 | { | |
216 | if (event->registered) | |
217 | unregister_event(event); | |
218 | } | |
219 | ||
7dd08bec | 220 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 221 | { |
7dd08bec MD |
222 | struct lttng_channel *chan, *tmpchan; |
223 | struct lttng_event *event, *tmpevent; | |
e58095ef | 224 | struct lttng_enabler *enabler, *tmpenabler; |
8020ceb5 | 225 | |
b5234c06 | 226 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 227 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 228 | _lttng_event_unregister(event); |
8020ceb5 MD |
229 | } |
230 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e58095ef MD |
231 | cds_list_for_each_entry_safe(enabler, tmpenabler, |
232 | &session->enablers_head, node) | |
233 | lttng_enabler_destroy(enabler); | |
234 | cds_list_for_each_entry_safe(event, tmpevent, | |
235 | &session->events_head, node) | |
7dd08bec | 236 | _lttng_event_destroy(event); |
e58095ef | 237 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 238 | _lttng_channel_unmap(chan); |
e58095ef | 239 | cds_list_del(&session->node); |
b5234c06 | 240 | free(session); |
8020ceb5 MD |
241 | } |
242 | ||
7dd08bec | 243 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
244 | { |
245 | int ret = 0; | |
7dd08bec | 246 | struct lttng_channel *chan; |
32ce8569 | 247 | int notify_socket; |
8020ceb5 | 248 | |
8020ceb5 MD |
249 | if (session->active) { |
250 | ret = -EBUSY; | |
251 | goto end; | |
252 | } | |
253 | ||
32ce8569 MD |
254 | notify_socket = lttng_get_notify_socket(session->owner); |
255 | if (notify_socket < 0) | |
256 | return notify_socket; | |
257 | ||
ac6b4ac6 MD |
258 | /* Set transient enabler state to "enabled" */ |
259 | session->tstate = 1; | |
e58095ef MD |
260 | /* We need to sync enablers with session before activation. */ |
261 | lttng_session_sync_enablers(session); | |
262 | ||
8020ceb5 MD |
263 | /* |
264 | * Snapshot the number of events per channel to know the type of header | |
265 | * we need to use. | |
266 | */ | |
e58095ef | 267 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 268 | const struct lttng_ctx *ctx; |
83e43212 | 269 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 270 | size_t nr_fields = 0; |
6ca18e66 | 271 | uint32_t chan_id; |
32ce8569 MD |
272 | |
273 | /* don't change it if session stop/restart */ | |
8020ceb5 | 274 | if (chan->header_type) |
32ce8569 MD |
275 | continue; |
276 | ctx = chan->ctx; | |
277 | if (ctx) { | |
278 | nr_fields = ctx->nr_fields; | |
83e43212 | 279 | fields = ctx->fields; |
32ce8569 MD |
280 | } |
281 | ret = ustcomm_register_channel(notify_socket, | |
282 | session->objd, | |
283 | chan->objd, | |
284 | nr_fields, | |
285 | fields, | |
6ca18e66 | 286 | &chan_id, |
32ce8569 | 287 | &chan->header_type); |
b869b5ae MD |
288 | if (ret) { |
289 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 290 | return ret; |
b869b5ae | 291 | } |
6ca18e66 MD |
292 | if (chan_id != chan->id) { |
293 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
294 | chan_id, chan->id); | |
295 | return -EINVAL; | |
296 | } | |
8020ceb5 MD |
297 | } |
298 | ||
ac6b4ac6 | 299 | /* Set atomically the state to "active" */ |
b5234c06 MD |
300 | CMM_ACCESS_ONCE(session->active) = 1; |
301 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 302 | |
246be17e PW |
303 | session->statedump_pending = 1; |
304 | lttng_ust_sockinfo_session_enabled(session->owner); | |
8020ceb5 | 305 | end: |
8020ceb5 MD |
306 | return ret; |
307 | } | |
308 | ||
7dd08bec | 309 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
310 | { |
311 | int ret = 0; | |
312 | ||
8020ceb5 MD |
313 | if (!session->active) { |
314 | ret = -EBUSY; | |
315 | goto end; | |
316 | } | |
ac6b4ac6 | 317 | /* Set atomically the state to "inactive" */ |
b5234c06 | 318 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
319 | |
320 | /* Set transient enabler state to "disabled" */ | |
321 | session->tstate = 0; | |
322 | lttng_session_sync_enablers(session); | |
8020ceb5 | 323 | end: |
8020ceb5 MD |
324 | return ret; |
325 | } | |
326 | ||
7dd08bec | 327 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 328 | { |
ac6b4ac6 | 329 | int ret = 0; |
976fe9ea | 330 | |
ac6b4ac6 MD |
331 | if (channel->enabled) { |
332 | ret = -EBUSY; | |
333 | goto end; | |
334 | } | |
335 | /* Set transient enabler state to "enabled" */ | |
336 | channel->tstate = 1; | |
337 | lttng_session_sync_enablers(channel->session); | |
338 | /* Set atomically the state to "enabled" */ | |
339 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
340 | end: | |
341 | return ret; | |
976fe9ea MD |
342 | } |
343 | ||
7dd08bec | 344 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 345 | { |
ac6b4ac6 | 346 | int ret = 0; |
976fe9ea | 347 | |
ac6b4ac6 MD |
348 | if (!channel->enabled) { |
349 | ret = -EBUSY; | |
350 | goto end; | |
351 | } | |
352 | /* Set atomically the state to "disabled" */ | |
353 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
354 | /* Set transient enabler state to "enabled" */ | |
355 | channel->tstate = 0; | |
356 | lttng_session_sync_enablers(channel->session); | |
357 | end: | |
358 | return ret; | |
976fe9ea MD |
359 | } |
360 | ||
8020ceb5 MD |
361 | /* |
362 | * Supports event creation while tracing session is active. | |
363 | */ | |
e58095ef MD |
364 | static |
365 | int lttng_event_create(const struct lttng_event_desc *desc, | |
366 | struct lttng_channel *chan) | |
8020ceb5 | 367 | { |
e58095ef | 368 | const char *event_name = desc->name; |
7dd08bec | 369 | struct lttng_event *event; |
32ce8569 | 370 | struct lttng_session *session = chan->session; |
d56fa719 MD |
371 | struct cds_hlist_head *head; |
372 | struct cds_hlist_node *node; | |
576599a0 | 373 | int ret = 0; |
d56fa719 MD |
374 | size_t name_len = strlen(event_name); |
375 | uint32_t hash; | |
32ce8569 MD |
376 | int notify_socket, loglevel; |
377 | const char *uri; | |
8020ceb5 | 378 | |
d56fa719 MD |
379 | hash = jhash(event_name, name_len, 0); |
380 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
381 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef | 382 | assert(event->desc); |
d970f72e MD |
383 | if (!strncmp(event->desc->name, desc->name, |
384 | LTTNG_UST_SYM_NAME_LEN - 1) | |
385 | && chan == event->chan) { | |
576599a0 | 386 | ret = -EEXIST; |
8020ceb5 | 387 | goto exist; |
576599a0 MD |
388 | } |
389 | } | |
457a6b58 | 390 | |
32ce8569 MD |
391 | notify_socket = lttng_get_notify_socket(session->owner); |
392 | if (notify_socket < 0) { | |
393 | ret = notify_socket; | |
394 | goto socket_error; | |
395 | } | |
396 | ||
457a6b58 MD |
397 | /* |
398 | * Check if loglevel match. Refuse to connect event if not. | |
399 | */ | |
7dd08bec | 400 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
401 | if (!event) { |
402 | ret = -ENOMEM; | |
8020ceb5 | 403 | goto cache_error; |
576599a0 | 404 | } |
8020ceb5 | 405 | event->chan = chan; |
e58095ef | 406 | |
ac6b4ac6 MD |
407 | /* Event will be enabled by enabler sync. */ |
408 | event->enabled = 0; | |
409 | event->registered = 0; | |
e58095ef MD |
410 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
411 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
412 | event->desc = desc; | |
32ce8569 MD |
413 | |
414 | if (desc->loglevel) | |
415 | loglevel = *(*event->desc->loglevel); | |
416 | else | |
417 | loglevel = TRACE_DEFAULT; | |
418 | if (desc->u.ext.model_emf_uri) | |
419 | uri = *(desc->u.ext.model_emf_uri); | |
420 | else | |
421 | uri = NULL; | |
422 | ||
13b21cd6 MD |
423 | /* Fetch event ID from sessiond */ |
424 | ret = ustcomm_register_event(notify_socket, | |
425 | session->objd, | |
426 | chan->objd, | |
427 | event_name, | |
428 | loglevel, | |
429 | desc->signature, | |
430 | desc->nr_fields, | |
431 | desc->fields, | |
432 | uri, | |
433 | &event->id); | |
434 | if (ret < 0) { | |
435 | DBG("Error (%d) registering event to sessiond", ret); | |
436 | goto sessiond_register_error; | |
32ce8569 | 437 | } |
2b213b16 | 438 | |
7dd08bec | 439 | /* Populate lttng_event structure before tracepoint registration. */ |
b5234c06 | 440 | cmm_smp_wmb(); |
e58095ef | 441 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 442 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 443 | return 0; |
8020ceb5 | 444 | |
32ce8569 | 445 | sessiond_register_error: |
b5234c06 | 446 | free(event); |
8020ceb5 | 447 | cache_error: |
32ce8569 | 448 | socket_error: |
8020ceb5 | 449 | exist: |
576599a0 | 450 | return ret; |
8020ceb5 MD |
451 | } |
452 | ||
e58095ef MD |
453 | static |
454 | int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, | |
455 | struct lttng_enabler *enabler) | |
456 | { | |
457 | int loglevel = 0; | |
7e2e405c | 458 | unsigned int has_loglevel = 0; |
e58095ef MD |
459 | |
460 | assert(enabler->type == LTTNG_ENABLER_WILDCARD); | |
461 | /* Compare excluding final '*' */ | |
462 | if (strncmp(desc->name, enabler->event_param.name, | |
463 | strlen(enabler->event_param.name) - 1)) | |
464 | return 0; | |
465 | if (desc->loglevel) { | |
466 | loglevel = *(*desc->loglevel); | |
467 | has_loglevel = 1; | |
468 | } | |
469 | if (!lttng_loglevel_match(loglevel, | |
470 | has_loglevel, | |
471 | enabler->event_param.loglevel_type, | |
472 | enabler->event_param.loglevel)) | |
473 | return 0; | |
474 | return 1; | |
475 | } | |
476 | ||
477 | static | |
478 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
479 | struct lttng_enabler *enabler) | |
480 | { | |
481 | int loglevel = 0; | |
482 | unsigned int has_loglevel = 0; | |
483 | ||
484 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
485 | if (strcmp(desc->name, enabler->event_param.name)) | |
486 | return 0; | |
487 | if (desc->loglevel) { | |
488 | loglevel = *(*desc->loglevel); | |
489 | has_loglevel = 1; | |
490 | } | |
491 | if (!lttng_loglevel_match(loglevel, | |
492 | has_loglevel, | |
493 | enabler->event_param.loglevel_type, | |
494 | enabler->event_param.loglevel)) | |
495 | return 0; | |
496 | return 1; | |
497 | } | |
498 | ||
499 | static | |
500 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
501 | struct lttng_enabler *enabler) | |
502 | { | |
ed5b5bbd JI |
503 | struct lttng_ust_excluder_node *excluder; |
504 | ||
505 | /* If event matches with an excluder, return 'does not match' */ | |
506 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
507 | int count; | |
508 | ||
509 | for (count = 0; count < excluder->excluder.count; count++) { | |
510 | int found, len; | |
511 | char *excluder_name; | |
512 | ||
513 | excluder_name = (char *) (excluder->excluder.names) | |
514 | + count * LTTNG_UST_SYM_NAME_LEN; | |
515 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
516 | if (len > 0 && excluder_name[len - 1] == '*') { | |
517 | found = !strncmp(desc->name, excluder_name, | |
518 | len - 1); | |
519 | } else { | |
520 | found = !strncmp(desc->name, excluder_name, | |
521 | LTTNG_UST_SYM_NAME_LEN - 1); | |
522 | } | |
523 | if (found) { | |
524 | return 0; | |
525 | } | |
526 | } | |
527 | } | |
e58095ef MD |
528 | switch (enabler->type) { |
529 | case LTTNG_ENABLER_WILDCARD: | |
530 | return lttng_desc_match_wildcard_enabler(desc, enabler); | |
531 | case LTTNG_ENABLER_EVENT: | |
532 | return lttng_desc_match_event_enabler(desc, enabler); | |
533 | default: | |
534 | return -EINVAL; | |
535 | } | |
536 | } | |
537 | ||
538 | static | |
539 | int lttng_event_match_enabler(struct lttng_event *event, | |
540 | struct lttng_enabler *enabler) | |
541 | { | |
d970f72e MD |
542 | if (lttng_desc_match_enabler(event->desc, enabler) |
543 | && event->chan == enabler->chan) | |
544 | return 1; | |
545 | else | |
546 | return 0; | |
e58095ef MD |
547 | } |
548 | ||
549 | static | |
550 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
551 | struct lttng_enabler *enabler) | |
552 | { | |
553 | struct lttng_enabler_ref *enabler_ref; | |
554 | ||
555 | cds_list_for_each_entry(enabler_ref, | |
556 | &event->enablers_ref_head, node) { | |
557 | if (enabler_ref->ref == enabler) | |
558 | return enabler_ref; | |
559 | } | |
560 | return NULL; | |
561 | } | |
562 | ||
8020ceb5 | 563 | /* |
e58095ef MD |
564 | * Create struct lttng_event if it is missing and present in the list of |
565 | * tracepoint probes. | |
8020ceb5 | 566 | */ |
e58095ef MD |
567 | static |
568 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 569 | { |
e58095ef MD |
570 | struct lttng_session *session = enabler->chan->session; |
571 | struct lttng_probe_desc *probe_desc; | |
572 | const struct lttng_event_desc *desc; | |
573 | struct lttng_event *event; | |
574 | int i; | |
575 | struct cds_list_head *probe_list; | |
576 | ||
577 | probe_list = lttng_get_probe_list_head(); | |
578 | /* | |
579 | * For each probe event, if we find that a probe event matches | |
580 | * our enabler, create an associated lttng_event if not | |
581 | * already present. | |
582 | */ | |
583 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
584 | for (i = 0; i < probe_desc->nr_events; i++) { | |
585 | int found = 0, ret; | |
d56fa719 MD |
586 | struct cds_hlist_head *head; |
587 | struct cds_hlist_node *node; | |
588 | const char *event_name; | |
589 | size_t name_len; | |
590 | uint32_t hash; | |
e58095ef MD |
591 | |
592 | desc = probe_desc->event_desc[i]; | |
593 | if (!lttng_desc_match_enabler(desc, enabler)) | |
594 | continue; | |
d56fa719 MD |
595 | event_name = desc->name; |
596 | name_len = strlen(event_name); | |
e58095ef MD |
597 | |
598 | /* | |
d56fa719 | 599 | * Check if already created. |
e58095ef | 600 | */ |
d56fa719 MD |
601 | hash = jhash(event_name, name_len, 0); |
602 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
603 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
d970f72e MD |
604 | if (event->desc == desc |
605 | && event->chan == enabler->chan) | |
e58095ef MD |
606 | found = 1; |
607 | } | |
608 | if (found) | |
609 | continue; | |
610 | ||
611 | /* | |
612 | * We need to create an event for this | |
613 | * event probe. | |
614 | */ | |
615 | ret = lttng_event_create(probe_desc->event_desc[i], | |
616 | enabler->chan); | |
617 | if (ret) { | |
32ce8569 MD |
618 | DBG("Unable to create event %s, error %d\n", |
619 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 620 | } |
8165c8da | 621 | } |
8020ceb5 | 622 | } |
8020ceb5 MD |
623 | } |
624 | ||
625 | /* | |
e58095ef MD |
626 | * Create events associated with an enabler (if not already present), |
627 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
628 | */ |
629 | static | |
e58095ef | 630 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 631 | { |
e58095ef MD |
632 | struct lttng_session *session = enabler->chan->session; |
633 | struct lttng_event *event; | |
634 | ||
635 | /* First ensure that probe events are created for this enabler. */ | |
636 | lttng_create_event_if_missing(enabler); | |
637 | ||
638 | /* For each event matching enabler in session event list. */ | |
639 | cds_list_for_each_entry(event, &session->events_head, node) { | |
640 | struct lttng_enabler_ref *enabler_ref; | |
641 | ||
642 | if (!lttng_event_match_enabler(event, enabler)) | |
643 | continue; | |
644 | ||
645 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
646 | if (!enabler_ref) { | |
647 | /* | |
648 | * If no backward ref, create it. | |
649 | * Add backward ref from event to enabler. | |
650 | */ | |
651 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
652 | if (!enabler_ref) | |
653 | return -ENOMEM; | |
654 | enabler_ref->ref = enabler; | |
655 | cds_list_add(&enabler_ref->node, | |
656 | &event->enablers_ref_head); | |
8165c8da | 657 | } |
e58095ef MD |
658 | |
659 | /* | |
660 | * Link filter bytecodes if not linked yet. | |
661 | */ | |
662 | lttng_enabler_event_link_bytecode(event, enabler); | |
663 | ||
664 | /* TODO: merge event context. */ | |
665 | } | |
666 | return 0; | |
667 | } | |
668 | ||
669 | /* | |
670 | * Called at library load: connect the probe on all enablers matching | |
671 | * this event. | |
5f733922 | 672 | * Called with session mutex held. |
e58095ef | 673 | */ |
5f733922 | 674 | int lttng_fix_pending_events(void) |
e58095ef MD |
675 | { |
676 | struct lttng_session *session; | |
677 | ||
678 | cds_list_for_each_entry(session, &sessions, node) { | |
679 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 680 | } |
e58095ef MD |
681 | return 0; |
682 | } | |
683 | ||
246be17e | 684 | /* |
37dddb65 MD |
685 | * For each session of the owner thread, execute pending statedump. |
686 | * Only dump state for the sessions owned by the caller thread, because | |
687 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 688 | */ |
37dddb65 | 689 | int lttng_handle_pending_statedump(void *owner) |
246be17e PW |
690 | { |
691 | struct lttng_session *session; | |
692 | ||
37dddb65 MD |
693 | /* Execute state dump */ |
694 | lttng_ust_baddr_statedump(owner); | |
695 | ||
696 | /* Clear pending state dump */ | |
697 | ust_lock(); | |
246be17e | 698 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
699 | if (session->owner != owner) |
700 | continue; | |
701 | if (!session->statedump_pending) | |
702 | continue; | |
703 | session->statedump_pending = 0; | |
246be17e | 704 | } |
37dddb65 | 705 | ust_unlock(); |
246be17e PW |
706 | return 0; |
707 | } | |
708 | ||
e58095ef MD |
709 | /* |
710 | * Only used internally at session destruction. | |
711 | */ | |
712 | static | |
713 | void _lttng_event_destroy(struct lttng_event *event) | |
714 | { | |
715 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
716 | ||
e58095ef | 717 | cds_list_del(&event->node); |
8020ceb5 | 718 | lttng_destroy_context(event->ctx); |
f488575f | 719 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
720 | /* Free event enabler refs */ |
721 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
722 | &event->enablers_ref_head, node) | |
723 | free(enabler_ref); | |
b5234c06 | 724 | free(event); |
8020ceb5 MD |
725 | } |
726 | ||
003fedf4 | 727 | void lttng_ust_events_exit(void) |
8020ceb5 | 728 | { |
7dd08bec | 729 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 730 | |
e58095ef | 731 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 732 | lttng_session_destroy(session); |
8020ceb5 | 733 | } |
457a6b58 | 734 | |
e58095ef MD |
735 | /* |
736 | * Enabler management. | |
737 | */ | |
738 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
739 | struct lttng_ust_event *event_param, | |
740 | struct lttng_channel *chan) | |
457a6b58 | 741 | { |
e58095ef MD |
742 | struct lttng_enabler *enabler; |
743 | ||
744 | enabler = zmalloc(sizeof(*enabler)); | |
745 | if (!enabler) | |
746 | return NULL; | |
747 | enabler->type = type; | |
748 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
0f63324a | 749 | CDS_INIT_LIST_HEAD(&enabler->excluder_head); |
e58095ef MD |
750 | memcpy(&enabler->event_param, event_param, |
751 | sizeof(enabler->event_param)); | |
752 | enabler->chan = chan; | |
753 | /* ctx left NULL */ | |
754 | enabler->enabled = 1; | |
755 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
756 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
757 | return enabler; | |
457a6b58 MD |
758 | } |
759 | ||
e58095ef | 760 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 761 | { |
e58095ef MD |
762 | enabler->enabled = 1; |
763 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
764 | return 0; | |
457a6b58 | 765 | } |
457a6b58 | 766 | |
e58095ef | 767 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 768 | { |
e58095ef MD |
769 | enabler->enabled = 0; |
770 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
771 | return 0; | |
772 | } | |
457a6b58 | 773 | |
e58095ef MD |
774 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
775 | struct lttng_ust_filter_bytecode_node *bytecode) | |
776 | { | |
777 | bytecode->enabler = enabler; | |
778 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
779 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
780 | return 0; | |
0bfb5cbd JI |
781 | } |
782 | ||
783 | int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
784 | struct lttng_ust_excluder_node *excluder) | |
785 | { | |
786 | excluder->enabler = enabler; | |
787 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
788 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
789 | return 0; | |
e58095ef | 790 | } |
f488575f | 791 | |
e58095ef MD |
792 | int lttng_attach_context(struct lttng_ust_context *context_param, |
793 | struct lttng_ctx **ctx, struct lttng_session *session) | |
794 | { | |
457a6b58 | 795 | /* |
e58095ef MD |
796 | * We cannot attach a context after trace has been started for a |
797 | * session because the metadata does not allow expressing this | |
798 | * information outside of the original channel scope. | |
457a6b58 | 799 | */ |
e58095ef MD |
800 | if (session->been_active) |
801 | return -EPERM; | |
457a6b58 | 802 | |
e58095ef MD |
803 | switch (context_param->ctx) { |
804 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
805 | return lttng_add_pthread_id_to_ctx(ctx); | |
806 | case LTTNG_UST_CONTEXT_VTID: | |
807 | return lttng_add_vtid_to_ctx(ctx); | |
808 | case LTTNG_UST_CONTEXT_VPID: | |
809 | return lttng_add_vpid_to_ctx(ctx); | |
810 | case LTTNG_UST_CONTEXT_PROCNAME: | |
811 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
812 | case LTTNG_UST_CONTEXT_IP: |
813 | return lttng_add_ip_to_ctx(ctx); | |
e58095ef MD |
814 | default: |
815 | return -EINVAL; | |
457a6b58 | 816 | } |
457a6b58 MD |
817 | } |
818 | ||
e58095ef MD |
819 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
820 | struct lttng_ust_context *context_param) | |
457a6b58 | 821 | { |
e58095ef MD |
822 | #if 0 // disabled for now. |
823 | struct lttng_session *session = enabler->chan->session; | |
824 | int ret; | |
457a6b58 | 825 | |
e58095ef MD |
826 | ret = lttng_attach_context(context_param, &enabler->ctx, |
827 | session); | |
828 | if (ret) | |
829 | return ret; | |
830 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
831 | #endif | |
832 | return -ENOSYS; | |
457a6b58 MD |
833 | } |
834 | ||
e58095ef MD |
835 | static |
836 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 837 | { |
e58095ef | 838 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
0f63324a | 839 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
457a6b58 | 840 | |
e58095ef MD |
841 | /* Destroy filter bytecode */ |
842 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
843 | &enabler->filter_bytecode_head, node) { | |
844 | free(filter_node); | |
457a6b58 | 845 | } |
e58095ef | 846 | |
0f63324a JI |
847 | /* Destroy excluders */ |
848 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
849 | &enabler->excluder_head, node) { | |
850 | free(excluder_node); | |
851 | } | |
852 | ||
e58095ef MD |
853 | /* Destroy contexts */ |
854 | lttng_destroy_context(enabler->ctx); | |
855 | ||
856 | cds_list_del(&enabler->node); | |
857 | free(enabler); | |
457a6b58 MD |
858 | } |
859 | ||
e58095ef MD |
860 | /* |
861 | * lttng_session_sync_enablers should be called just before starting a | |
862 | * session. | |
863 | */ | |
457a6b58 | 864 | static |
e58095ef | 865 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 866 | { |
e58095ef MD |
867 | struct lttng_enabler *enabler; |
868 | struct lttng_event *event; | |
457a6b58 | 869 | |
e58095ef MD |
870 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
871 | lttng_enabler_ref_events(enabler); | |
872 | /* | |
873 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
874 | * and its channel and session transient states are enabled, we |
875 | * enable the event, else we disable it. | |
e58095ef MD |
876 | */ |
877 | cds_list_for_each_entry(event, &session->events_head, node) { | |
878 | struct lttng_enabler_ref *enabler_ref; | |
879 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 880 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
881 | |
882 | /* Enable events */ | |
883 | cds_list_for_each_entry(enabler_ref, | |
884 | &event->enablers_ref_head, node) { | |
885 | if (enabler_ref->ref->enabled) { | |
886 | enabled = 1; | |
887 | break; | |
888 | } | |
889 | } | |
ac6b4ac6 MD |
890 | /* |
891 | * Enabled state is based on union of enablers, with | |
892 | * intesection of session and channel transient enable | |
893 | * states. | |
894 | */ | |
895 | enabled = enabled && session->tstate && event->chan->tstate; | |
896 | ||
897 | CMM_STORE_SHARED(event->enabled, enabled); | |
898 | /* | |
899 | * Sync tracepoint registration with event enabled | |
900 | * state. | |
901 | */ | |
902 | if (enabled) { | |
903 | if (!event->registered) | |
904 | register_event(event); | |
905 | } else { | |
906 | if (event->registered) | |
907 | unregister_event(event); | |
908 | } | |
457a6b58 | 909 | |
1f49fc05 | 910 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
911 | cds_list_for_each_entry(enabler_ref, |
912 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
913 | if (enabler_ref->ref->enabled |
914 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
915 | has_enablers_without_bytecode = 1; |
916 | break; | |
917 | } | |
918 | } | |
919 | event->has_enablers_without_bytecode = | |
920 | has_enablers_without_bytecode; | |
921 | ||
e58095ef MD |
922 | /* Enable filters */ |
923 | cds_list_for_each_entry(runtime, | |
924 | &event->bytecode_runtime_head, node) { | |
925 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
926 | } |
927 | } | |
457a6b58 MD |
928 | } |
929 | ||
e58095ef MD |
930 | /* |
931 | * Apply enablers to session events, adding events to session if need | |
932 | * be. It is required after each modification applied to an active | |
933 | * session, and right before session "start". | |
934 | * "lazy" sync means we only sync if required. | |
935 | */ | |
936 | static | |
937 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 938 | { |
e58095ef MD |
939 | /* We can skip if session is not active */ |
940 | if (!session->active) | |
941 | return; | |
942 | lttng_session_sync_enablers(session); | |
457a6b58 | 943 | } |