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: | |
e58095ef | 107 | if (loglevel <= req_loglevel || req_loglevel == -1) |
457a6b58 MD |
108 | return 1; |
109 | else | |
110 | return 0; | |
111 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
e58095ef | 112 | if (loglevel == req_loglevel || req_loglevel == -1) |
457a6b58 MD |
113 | return 1; |
114 | else | |
115 | return 0; | |
116 | case LTTNG_UST_LOGLEVEL_ALL: | |
117 | default: | |
118 | return 1; | |
119 | } | |
120 | } | |
121 | ||
8020ceb5 MD |
122 | void synchronize_trace(void) |
123 | { | |
8020ceb5 | 124 | synchronize_rcu(); |
8020ceb5 MD |
125 | } |
126 | ||
7dd08bec | 127 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 128 | { |
7dd08bec | 129 | struct lttng_session *session; |
74d81a6c | 130 | int i; |
8020ceb5 | 131 | |
7dd08bec | 132 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
133 | if (!session) |
134 | return NULL; | |
e58095ef MD |
135 | CDS_INIT_LIST_HEAD(&session->chan_head); |
136 | CDS_INIT_LIST_HEAD(&session->events_head); | |
137 | CDS_INIT_LIST_HEAD(&session->enablers_head); | |
d56fa719 MD |
138 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
139 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
e58095ef | 140 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
141 | return session; |
142 | } | |
143 | ||
74d81a6c MD |
144 | /* |
145 | * Only used internally at session destruction. | |
146 | */ | |
147 | static | |
148 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
149 | { | |
150 | struct channel *chan; | |
151 | struct lttng_ust_shm_handle *handle; | |
152 | ||
153 | cds_list_del(<tng_chan->node); | |
154 | lttng_destroy_context(lttng_chan->ctx); | |
155 | chan = lttng_chan->chan; | |
156 | handle = lttng_chan->handle; | |
157 | /* | |
158 | * note: lttng_chan is private data contained within handle. It | |
159 | * will be freed along with the handle. | |
160 | */ | |
161 | channel_destroy(chan, handle, 0); | |
162 | } | |
163 | ||
ac6b4ac6 MD |
164 | static |
165 | void register_event(struct lttng_event *event) | |
166 | { | |
167 | int ret; | |
168 | const struct lttng_event_desc *desc; | |
169 | ||
170 | assert(event->registered == 0); | |
171 | desc = event->desc; | |
172 | ret = __tracepoint_probe_register(desc->name, | |
173 | desc->probe_callback, | |
174 | event, desc->signature); | |
175 | WARN_ON_ONCE(ret); | |
176 | if (!ret) | |
177 | event->registered = 1; | |
178 | } | |
179 | ||
180 | static | |
181 | void unregister_event(struct lttng_event *event) | |
182 | { | |
183 | int ret; | |
184 | const struct lttng_event_desc *desc; | |
185 | ||
186 | assert(event->registered == 1); | |
187 | desc = event->desc; | |
188 | ret = __tracepoint_probe_unregister(desc->name, | |
189 | desc->probe_callback, | |
190 | event); | |
191 | WARN_ON_ONCE(ret); | |
192 | if (!ret) | |
193 | event->registered = 0; | |
194 | } | |
195 | ||
196 | /* | |
197 | * Only used internally at session destruction. | |
198 | */ | |
199 | static | |
200 | void _lttng_event_unregister(struct lttng_event *event) | |
201 | { | |
202 | if (event->registered) | |
203 | unregister_event(event); | |
204 | } | |
205 | ||
7dd08bec | 206 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 207 | { |
7dd08bec MD |
208 | struct lttng_channel *chan, *tmpchan; |
209 | struct lttng_event *event, *tmpevent; | |
e58095ef | 210 | struct lttng_enabler *enabler, *tmpenabler; |
8020ceb5 | 211 | |
b5234c06 | 212 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 213 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 214 | _lttng_event_unregister(event); |
8020ceb5 MD |
215 | } |
216 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e58095ef MD |
217 | cds_list_for_each_entry_safe(enabler, tmpenabler, |
218 | &session->enablers_head, node) | |
219 | lttng_enabler_destroy(enabler); | |
220 | cds_list_for_each_entry_safe(event, tmpevent, | |
221 | &session->events_head, node) | |
7dd08bec | 222 | _lttng_event_destroy(event); |
e58095ef | 223 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 224 | _lttng_channel_unmap(chan); |
e58095ef | 225 | cds_list_del(&session->node); |
b5234c06 | 226 | free(session); |
8020ceb5 MD |
227 | } |
228 | ||
7dd08bec | 229 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
230 | { |
231 | int ret = 0; | |
7dd08bec | 232 | struct lttng_channel *chan; |
32ce8569 | 233 | int notify_socket; |
8020ceb5 | 234 | |
8020ceb5 MD |
235 | if (session->active) { |
236 | ret = -EBUSY; | |
237 | goto end; | |
238 | } | |
239 | ||
32ce8569 MD |
240 | notify_socket = lttng_get_notify_socket(session->owner); |
241 | if (notify_socket < 0) | |
242 | return notify_socket; | |
243 | ||
ac6b4ac6 MD |
244 | /* Set transient enabler state to "enabled" */ |
245 | session->tstate = 1; | |
e58095ef | 246 | |
8020ceb5 MD |
247 | /* |
248 | * Snapshot the number of events per channel to know the type of header | |
249 | * we need to use. | |
250 | */ | |
e58095ef | 251 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 252 | const struct lttng_ctx *ctx; |
83e43212 | 253 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 254 | size_t nr_fields = 0; |
6ca18e66 | 255 | uint32_t chan_id; |
32ce8569 MD |
256 | |
257 | /* don't change it if session stop/restart */ | |
8020ceb5 | 258 | if (chan->header_type) |
32ce8569 MD |
259 | continue; |
260 | ctx = chan->ctx; | |
261 | if (ctx) { | |
262 | nr_fields = ctx->nr_fields; | |
83e43212 | 263 | fields = ctx->fields; |
32ce8569 MD |
264 | } |
265 | ret = ustcomm_register_channel(notify_socket, | |
266 | session->objd, | |
267 | chan->objd, | |
268 | nr_fields, | |
269 | fields, | |
6ca18e66 | 270 | &chan_id, |
32ce8569 | 271 | &chan->header_type); |
b869b5ae MD |
272 | if (ret) { |
273 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 274 | return ret; |
b869b5ae | 275 | } |
6ca18e66 MD |
276 | if (chan_id != chan->id) { |
277 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
278 | chan_id, chan->id); | |
279 | return -EINVAL; | |
280 | } | |
8020ceb5 MD |
281 | } |
282 | ||
79ee7d56 FD |
283 | /* We need to sync enablers with session before activation. */ |
284 | lttng_session_sync_enablers(session); | |
285 | ||
ac6b4ac6 | 286 | /* Set atomically the state to "active" */ |
b5234c06 MD |
287 | CMM_ACCESS_ONCE(session->active) = 1; |
288 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 289 | |
246be17e PW |
290 | session->statedump_pending = 1; |
291 | lttng_ust_sockinfo_session_enabled(session->owner); | |
8020ceb5 | 292 | end: |
8020ceb5 MD |
293 | return ret; |
294 | } | |
295 | ||
7dd08bec | 296 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
297 | { |
298 | int ret = 0; | |
299 | ||
8020ceb5 MD |
300 | if (!session->active) { |
301 | ret = -EBUSY; | |
302 | goto end; | |
303 | } | |
ac6b4ac6 | 304 | /* Set atomically the state to "inactive" */ |
b5234c06 | 305 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
306 | |
307 | /* Set transient enabler state to "disabled" */ | |
308 | session->tstate = 0; | |
309 | lttng_session_sync_enablers(session); | |
8020ceb5 | 310 | end: |
8020ceb5 MD |
311 | return ret; |
312 | } | |
313 | ||
7dd08bec | 314 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 315 | { |
ac6b4ac6 | 316 | int ret = 0; |
976fe9ea | 317 | |
ac6b4ac6 MD |
318 | if (channel->enabled) { |
319 | ret = -EBUSY; | |
320 | goto end; | |
321 | } | |
322 | /* Set transient enabler state to "enabled" */ | |
323 | channel->tstate = 1; | |
324 | lttng_session_sync_enablers(channel->session); | |
325 | /* Set atomically the state to "enabled" */ | |
326 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
327 | end: | |
328 | return ret; | |
976fe9ea MD |
329 | } |
330 | ||
7dd08bec | 331 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 332 | { |
ac6b4ac6 | 333 | int ret = 0; |
976fe9ea | 334 | |
ac6b4ac6 MD |
335 | if (!channel->enabled) { |
336 | ret = -EBUSY; | |
337 | goto end; | |
338 | } | |
339 | /* Set atomically the state to "disabled" */ | |
340 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
341 | /* Set transient enabler state to "enabled" */ | |
342 | channel->tstate = 0; | |
343 | lttng_session_sync_enablers(channel->session); | |
344 | end: | |
345 | return ret; | |
976fe9ea MD |
346 | } |
347 | ||
8020ceb5 MD |
348 | /* |
349 | * Supports event creation while tracing session is active. | |
350 | */ | |
e58095ef MD |
351 | static |
352 | int lttng_event_create(const struct lttng_event_desc *desc, | |
353 | struct lttng_channel *chan) | |
8020ceb5 | 354 | { |
e58095ef | 355 | const char *event_name = desc->name; |
7dd08bec | 356 | struct lttng_event *event; |
32ce8569 | 357 | struct lttng_session *session = chan->session; |
d56fa719 MD |
358 | struct cds_hlist_head *head; |
359 | struct cds_hlist_node *node; | |
576599a0 | 360 | int ret = 0; |
d56fa719 MD |
361 | size_t name_len = strlen(event_name); |
362 | uint32_t hash; | |
32ce8569 MD |
363 | int notify_socket, loglevel; |
364 | const char *uri; | |
8020ceb5 | 365 | |
d56fa719 MD |
366 | hash = jhash(event_name, name_len, 0); |
367 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
368 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef | 369 | assert(event->desc); |
d970f72e MD |
370 | if (!strncmp(event->desc->name, desc->name, |
371 | LTTNG_UST_SYM_NAME_LEN - 1) | |
372 | && chan == event->chan) { | |
576599a0 | 373 | ret = -EEXIST; |
8020ceb5 | 374 | goto exist; |
576599a0 MD |
375 | } |
376 | } | |
457a6b58 | 377 | |
32ce8569 MD |
378 | notify_socket = lttng_get_notify_socket(session->owner); |
379 | if (notify_socket < 0) { | |
380 | ret = notify_socket; | |
381 | goto socket_error; | |
382 | } | |
383 | ||
457a6b58 MD |
384 | /* |
385 | * Check if loglevel match. Refuse to connect event if not. | |
386 | */ | |
7dd08bec | 387 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
388 | if (!event) { |
389 | ret = -ENOMEM; | |
8020ceb5 | 390 | goto cache_error; |
576599a0 | 391 | } |
8020ceb5 | 392 | event->chan = chan; |
e58095ef | 393 | |
ac6b4ac6 MD |
394 | /* Event will be enabled by enabler sync. */ |
395 | event->enabled = 0; | |
396 | event->registered = 0; | |
e58095ef MD |
397 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
398 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
399 | event->desc = desc; | |
32ce8569 MD |
400 | |
401 | if (desc->loglevel) | |
402 | loglevel = *(*event->desc->loglevel); | |
403 | else | |
404 | loglevel = TRACE_DEFAULT; | |
405 | if (desc->u.ext.model_emf_uri) | |
406 | uri = *(desc->u.ext.model_emf_uri); | |
407 | else | |
408 | uri = NULL; | |
409 | ||
13b21cd6 MD |
410 | /* Fetch event ID from sessiond */ |
411 | ret = ustcomm_register_event(notify_socket, | |
412 | session->objd, | |
413 | chan->objd, | |
414 | event_name, | |
415 | loglevel, | |
416 | desc->signature, | |
417 | desc->nr_fields, | |
418 | desc->fields, | |
419 | uri, | |
420 | &event->id); | |
421 | if (ret < 0) { | |
422 | DBG("Error (%d) registering event to sessiond", ret); | |
423 | goto sessiond_register_error; | |
32ce8569 | 424 | } |
2b213b16 | 425 | |
7dd08bec | 426 | /* Populate lttng_event structure before tracepoint registration. */ |
b5234c06 | 427 | cmm_smp_wmb(); |
e58095ef | 428 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 429 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 430 | return 0; |
8020ceb5 | 431 | |
32ce8569 | 432 | sessiond_register_error: |
b5234c06 | 433 | free(event); |
8020ceb5 | 434 | cache_error: |
32ce8569 | 435 | socket_error: |
8020ceb5 | 436 | exist: |
576599a0 | 437 | return ret; |
8020ceb5 MD |
438 | } |
439 | ||
e58095ef MD |
440 | static |
441 | int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, | |
442 | struct lttng_enabler *enabler) | |
443 | { | |
444 | int loglevel = 0; | |
7e2e405c | 445 | unsigned int has_loglevel = 0; |
e58095ef MD |
446 | |
447 | assert(enabler->type == LTTNG_ENABLER_WILDCARD); | |
448 | /* Compare excluding final '*' */ | |
449 | if (strncmp(desc->name, enabler->event_param.name, | |
450 | strlen(enabler->event_param.name) - 1)) | |
451 | return 0; | |
452 | if (desc->loglevel) { | |
453 | loglevel = *(*desc->loglevel); | |
454 | has_loglevel = 1; | |
455 | } | |
456 | if (!lttng_loglevel_match(loglevel, | |
457 | has_loglevel, | |
458 | enabler->event_param.loglevel_type, | |
459 | enabler->event_param.loglevel)) | |
460 | return 0; | |
461 | return 1; | |
462 | } | |
463 | ||
464 | static | |
465 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
466 | struct lttng_enabler *enabler) | |
467 | { | |
468 | int loglevel = 0; | |
469 | unsigned int has_loglevel = 0; | |
470 | ||
471 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
472 | if (strcmp(desc->name, enabler->event_param.name)) | |
473 | return 0; | |
474 | if (desc->loglevel) { | |
475 | loglevel = *(*desc->loglevel); | |
476 | has_loglevel = 1; | |
477 | } | |
478 | if (!lttng_loglevel_match(loglevel, | |
479 | has_loglevel, | |
480 | enabler->event_param.loglevel_type, | |
481 | enabler->event_param.loglevel)) | |
482 | return 0; | |
483 | return 1; | |
484 | } | |
485 | ||
486 | static | |
487 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
488 | struct lttng_enabler *enabler) | |
489 | { | |
ed5b5bbd JI |
490 | struct lttng_ust_excluder_node *excluder; |
491 | ||
492 | /* If event matches with an excluder, return 'does not match' */ | |
493 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
494 | int count; | |
495 | ||
496 | for (count = 0; count < excluder->excluder.count; count++) { | |
497 | int found, len; | |
498 | char *excluder_name; | |
499 | ||
500 | excluder_name = (char *) (excluder->excluder.names) | |
501 | + count * LTTNG_UST_SYM_NAME_LEN; | |
502 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
503 | if (len > 0 && excluder_name[len - 1] == '*') { | |
504 | found = !strncmp(desc->name, excluder_name, | |
505 | len - 1); | |
506 | } else { | |
507 | found = !strncmp(desc->name, excluder_name, | |
508 | LTTNG_UST_SYM_NAME_LEN - 1); | |
509 | } | |
510 | if (found) { | |
511 | return 0; | |
512 | } | |
513 | } | |
514 | } | |
e58095ef MD |
515 | switch (enabler->type) { |
516 | case LTTNG_ENABLER_WILDCARD: | |
517 | return lttng_desc_match_wildcard_enabler(desc, enabler); | |
518 | case LTTNG_ENABLER_EVENT: | |
519 | return lttng_desc_match_event_enabler(desc, enabler); | |
520 | default: | |
521 | return -EINVAL; | |
522 | } | |
523 | } | |
524 | ||
525 | static | |
526 | int lttng_event_match_enabler(struct lttng_event *event, | |
527 | struct lttng_enabler *enabler) | |
528 | { | |
d970f72e MD |
529 | if (lttng_desc_match_enabler(event->desc, enabler) |
530 | && event->chan == enabler->chan) | |
531 | return 1; | |
532 | else | |
533 | return 0; | |
e58095ef MD |
534 | } |
535 | ||
536 | static | |
537 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
538 | struct lttng_enabler *enabler) | |
539 | { | |
540 | struct lttng_enabler_ref *enabler_ref; | |
541 | ||
542 | cds_list_for_each_entry(enabler_ref, | |
543 | &event->enablers_ref_head, node) { | |
544 | if (enabler_ref->ref == enabler) | |
545 | return enabler_ref; | |
546 | } | |
547 | return NULL; | |
548 | } | |
549 | ||
8020ceb5 | 550 | /* |
e58095ef MD |
551 | * Create struct lttng_event if it is missing and present in the list of |
552 | * tracepoint probes. | |
8020ceb5 | 553 | */ |
e58095ef MD |
554 | static |
555 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 556 | { |
e58095ef MD |
557 | struct lttng_session *session = enabler->chan->session; |
558 | struct lttng_probe_desc *probe_desc; | |
559 | const struct lttng_event_desc *desc; | |
560 | struct lttng_event *event; | |
561 | int i; | |
562 | struct cds_list_head *probe_list; | |
563 | ||
564 | probe_list = lttng_get_probe_list_head(); | |
565 | /* | |
566 | * For each probe event, if we find that a probe event matches | |
567 | * our enabler, create an associated lttng_event if not | |
568 | * already present. | |
569 | */ | |
570 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
571 | for (i = 0; i < probe_desc->nr_events; i++) { | |
572 | int found = 0, ret; | |
d56fa719 MD |
573 | struct cds_hlist_head *head; |
574 | struct cds_hlist_node *node; | |
575 | const char *event_name; | |
576 | size_t name_len; | |
577 | uint32_t hash; | |
e58095ef MD |
578 | |
579 | desc = probe_desc->event_desc[i]; | |
580 | if (!lttng_desc_match_enabler(desc, enabler)) | |
581 | continue; | |
d56fa719 MD |
582 | event_name = desc->name; |
583 | name_len = strlen(event_name); | |
e58095ef MD |
584 | |
585 | /* | |
d56fa719 | 586 | * Check if already created. |
e58095ef | 587 | */ |
d56fa719 MD |
588 | hash = jhash(event_name, name_len, 0); |
589 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
590 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
d970f72e MD |
591 | if (event->desc == desc |
592 | && event->chan == enabler->chan) | |
e58095ef MD |
593 | found = 1; |
594 | } | |
595 | if (found) | |
596 | continue; | |
597 | ||
598 | /* | |
599 | * We need to create an event for this | |
600 | * event probe. | |
601 | */ | |
602 | ret = lttng_event_create(probe_desc->event_desc[i], | |
603 | enabler->chan); | |
604 | if (ret) { | |
32ce8569 MD |
605 | DBG("Unable to create event %s, error %d\n", |
606 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 607 | } |
8165c8da | 608 | } |
8020ceb5 | 609 | } |
8020ceb5 MD |
610 | } |
611 | ||
612 | /* | |
e58095ef MD |
613 | * Create events associated with an enabler (if not already present), |
614 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
615 | */ |
616 | static | |
e58095ef | 617 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 618 | { |
e58095ef MD |
619 | struct lttng_session *session = enabler->chan->session; |
620 | struct lttng_event *event; | |
621 | ||
622 | /* First ensure that probe events are created for this enabler. */ | |
623 | lttng_create_event_if_missing(enabler); | |
624 | ||
625 | /* For each event matching enabler in session event list. */ | |
626 | cds_list_for_each_entry(event, &session->events_head, node) { | |
627 | struct lttng_enabler_ref *enabler_ref; | |
628 | ||
629 | if (!lttng_event_match_enabler(event, enabler)) | |
630 | continue; | |
631 | ||
632 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
633 | if (!enabler_ref) { | |
634 | /* | |
635 | * If no backward ref, create it. | |
636 | * Add backward ref from event to enabler. | |
637 | */ | |
638 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
639 | if (!enabler_ref) | |
640 | return -ENOMEM; | |
641 | enabler_ref->ref = enabler; | |
642 | cds_list_add(&enabler_ref->node, | |
643 | &event->enablers_ref_head); | |
8165c8da | 644 | } |
e58095ef MD |
645 | |
646 | /* | |
647 | * Link filter bytecodes if not linked yet. | |
648 | */ | |
649 | lttng_enabler_event_link_bytecode(event, enabler); | |
650 | ||
651 | /* TODO: merge event context. */ | |
652 | } | |
653 | return 0; | |
654 | } | |
655 | ||
656 | /* | |
657 | * Called at library load: connect the probe on all enablers matching | |
658 | * this event. | |
5f733922 | 659 | * Called with session mutex held. |
e58095ef | 660 | */ |
5f733922 | 661 | int lttng_fix_pending_events(void) |
e58095ef MD |
662 | { |
663 | struct lttng_session *session; | |
664 | ||
665 | cds_list_for_each_entry(session, &sessions, node) { | |
666 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 667 | } |
e58095ef MD |
668 | return 0; |
669 | } | |
670 | ||
246be17e | 671 | /* |
37dddb65 MD |
672 | * For each session of the owner thread, execute pending statedump. |
673 | * Only dump state for the sessions owned by the caller thread, because | |
674 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 675 | */ |
3327ac33 | 676 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
677 | { |
678 | struct lttng_session *session; | |
679 | ||
37dddb65 MD |
680 | /* Execute state dump */ |
681 | lttng_ust_baddr_statedump(owner); | |
682 | ||
683 | /* Clear pending state dump */ | |
3327ac33 MD |
684 | if (ust_lock()) { |
685 | goto end; | |
686 | } | |
246be17e | 687 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
688 | if (session->owner != owner) |
689 | continue; | |
690 | if (!session->statedump_pending) | |
691 | continue; | |
692 | session->statedump_pending = 0; | |
246be17e | 693 | } |
3327ac33 | 694 | end: |
37dddb65 | 695 | ust_unlock(); |
3327ac33 | 696 | return; |
246be17e PW |
697 | } |
698 | ||
e58095ef MD |
699 | /* |
700 | * Only used internally at session destruction. | |
701 | */ | |
702 | static | |
703 | void _lttng_event_destroy(struct lttng_event *event) | |
704 | { | |
705 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
706 | ||
e58095ef | 707 | cds_list_del(&event->node); |
8020ceb5 | 708 | lttng_destroy_context(event->ctx); |
f488575f | 709 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
710 | /* Free event enabler refs */ |
711 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
712 | &event->enablers_ref_head, node) | |
713 | free(enabler_ref); | |
b5234c06 | 714 | free(event); |
8020ceb5 MD |
715 | } |
716 | ||
003fedf4 | 717 | void lttng_ust_events_exit(void) |
8020ceb5 | 718 | { |
7dd08bec | 719 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 720 | |
e58095ef | 721 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 722 | lttng_session_destroy(session); |
8020ceb5 | 723 | } |
457a6b58 | 724 | |
e58095ef MD |
725 | /* |
726 | * Enabler management. | |
727 | */ | |
728 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
729 | struct lttng_ust_event *event_param, | |
730 | struct lttng_channel *chan) | |
457a6b58 | 731 | { |
e58095ef MD |
732 | struct lttng_enabler *enabler; |
733 | ||
734 | enabler = zmalloc(sizeof(*enabler)); | |
735 | if (!enabler) | |
736 | return NULL; | |
737 | enabler->type = type; | |
738 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
0f63324a | 739 | CDS_INIT_LIST_HEAD(&enabler->excluder_head); |
e58095ef MD |
740 | memcpy(&enabler->event_param, event_param, |
741 | sizeof(enabler->event_param)); | |
742 | enabler->chan = chan; | |
743 | /* ctx left NULL */ | |
353c9dc0 MD |
744 | /* |
745 | * The "disable" event create comm field has been added to fix a | |
746 | * race between event creation (of a started trace) and enabling | |
747 | * filtering. New session daemon always set the "disable" field | |
748 | * to 1, and are aware that they need to explicitly enable the | |
749 | * event. Older session daemon (within same ABI) leave it at 0, | |
750 | * and therefore we need to enable it here, keeping the original | |
751 | * racy behavior. | |
752 | */ | |
753 | enabler->enabled = !event_param->disabled; | |
e58095ef MD |
754 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); |
755 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
756 | return enabler; | |
457a6b58 MD |
757 | } |
758 | ||
e58095ef | 759 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 760 | { |
e58095ef MD |
761 | enabler->enabled = 1; |
762 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
763 | return 0; | |
457a6b58 | 764 | } |
457a6b58 | 765 | |
e58095ef | 766 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 767 | { |
e58095ef MD |
768 | enabler->enabled = 0; |
769 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
770 | return 0; | |
771 | } | |
457a6b58 | 772 | |
e58095ef MD |
773 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
774 | struct lttng_ust_filter_bytecode_node *bytecode) | |
775 | { | |
776 | bytecode->enabler = enabler; | |
777 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
778 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
779 | return 0; | |
0bfb5cbd JI |
780 | } |
781 | ||
782 | int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
783 | struct lttng_ust_excluder_node *excluder) | |
784 | { | |
785 | excluder->enabler = enabler; | |
786 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
787 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
788 | return 0; | |
e58095ef | 789 | } |
f488575f | 790 | |
e58095ef MD |
791 | int lttng_attach_context(struct lttng_ust_context *context_param, |
792 | struct lttng_ctx **ctx, struct lttng_session *session) | |
793 | { | |
457a6b58 | 794 | /* |
e58095ef MD |
795 | * We cannot attach a context after trace has been started for a |
796 | * session because the metadata does not allow expressing this | |
797 | * information outside of the original channel scope. | |
457a6b58 | 798 | */ |
e58095ef MD |
799 | if (session->been_active) |
800 | return -EPERM; | |
457a6b58 | 801 | |
e58095ef MD |
802 | switch (context_param->ctx) { |
803 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
804 | return lttng_add_pthread_id_to_ctx(ctx); | |
805 | case LTTNG_UST_CONTEXT_VTID: | |
806 | return lttng_add_vtid_to_ctx(ctx); | |
807 | case LTTNG_UST_CONTEXT_VPID: | |
808 | return lttng_add_vpid_to_ctx(ctx); | |
809 | case LTTNG_UST_CONTEXT_PROCNAME: | |
810 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
811 | case LTTNG_UST_CONTEXT_IP: |
812 | return lttng_add_ip_to_ctx(ctx); | |
e58095ef MD |
813 | default: |
814 | return -EINVAL; | |
457a6b58 | 815 | } |
457a6b58 MD |
816 | } |
817 | ||
e58095ef MD |
818 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
819 | struct lttng_ust_context *context_param) | |
457a6b58 | 820 | { |
e58095ef MD |
821 | #if 0 // disabled for now. |
822 | struct lttng_session *session = enabler->chan->session; | |
823 | int ret; | |
457a6b58 | 824 | |
e58095ef MD |
825 | ret = lttng_attach_context(context_param, &enabler->ctx, |
826 | session); | |
827 | if (ret) | |
828 | return ret; | |
829 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
830 | #endif | |
831 | return -ENOSYS; | |
457a6b58 MD |
832 | } |
833 | ||
e58095ef MD |
834 | static |
835 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 836 | { |
e58095ef | 837 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
0f63324a | 838 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
457a6b58 | 839 | |
e58095ef MD |
840 | /* Destroy filter bytecode */ |
841 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
842 | &enabler->filter_bytecode_head, node) { | |
843 | free(filter_node); | |
457a6b58 | 844 | } |
e58095ef | 845 | |
0f63324a JI |
846 | /* Destroy excluders */ |
847 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
848 | &enabler->excluder_head, node) { | |
849 | free(excluder_node); | |
850 | } | |
851 | ||
e58095ef MD |
852 | /* Destroy contexts */ |
853 | lttng_destroy_context(enabler->ctx); | |
854 | ||
855 | cds_list_del(&enabler->node); | |
856 | free(enabler); | |
457a6b58 MD |
857 | } |
858 | ||
e58095ef MD |
859 | /* |
860 | * lttng_session_sync_enablers should be called just before starting a | |
861 | * session. | |
862 | */ | |
457a6b58 | 863 | static |
e58095ef | 864 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 865 | { |
e58095ef MD |
866 | struct lttng_enabler *enabler; |
867 | struct lttng_event *event; | |
457a6b58 | 868 | |
e58095ef MD |
869 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
870 | lttng_enabler_ref_events(enabler); | |
871 | /* | |
872 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
873 | * and its channel and session transient states are enabled, we |
874 | * enable the event, else we disable it. | |
e58095ef MD |
875 | */ |
876 | cds_list_for_each_entry(event, &session->events_head, node) { | |
877 | struct lttng_enabler_ref *enabler_ref; | |
878 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 879 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
880 | |
881 | /* Enable events */ | |
882 | cds_list_for_each_entry(enabler_ref, | |
883 | &event->enablers_ref_head, node) { | |
884 | if (enabler_ref->ref->enabled) { | |
885 | enabled = 1; | |
886 | break; | |
887 | } | |
888 | } | |
ac6b4ac6 MD |
889 | /* |
890 | * Enabled state is based on union of enablers, with | |
891 | * intesection of session and channel transient enable | |
892 | * states. | |
893 | */ | |
894 | enabled = enabled && session->tstate && event->chan->tstate; | |
895 | ||
896 | CMM_STORE_SHARED(event->enabled, enabled); | |
897 | /* | |
898 | * Sync tracepoint registration with event enabled | |
899 | * state. | |
900 | */ | |
901 | if (enabled) { | |
902 | if (!event->registered) | |
903 | register_event(event); | |
904 | } else { | |
905 | if (event->registered) | |
906 | unregister_event(event); | |
907 | } | |
457a6b58 | 908 | |
1f49fc05 | 909 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
910 | cds_list_for_each_entry(enabler_ref, |
911 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
912 | if (enabler_ref->ref->enabled |
913 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
914 | has_enablers_without_bytecode = 1; |
915 | break; | |
916 | } | |
917 | } | |
918 | event->has_enablers_without_bytecode = | |
919 | has_enablers_without_bytecode; | |
920 | ||
e58095ef MD |
921 | /* Enable filters */ |
922 | cds_list_for_each_entry(runtime, | |
923 | &event->bytecode_runtime_head, node) { | |
924 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
925 | } |
926 | } | |
457a6b58 MD |
927 | } |
928 | ||
e58095ef MD |
929 | /* |
930 | * Apply enablers to session events, adding events to session if need | |
931 | * be. It is required after each modification applied to an active | |
932 | * session, and right before session "start". | |
933 | * "lazy" sync means we only sync if required. | |
934 | */ | |
935 | static | |
936 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 937 | { |
e58095ef MD |
938 | /* We can skip if session is not active */ |
939 | if (!session->active) | |
940 | return; | |
941 | lttng_session_sync_enablers(session); | |
457a6b58 | 942 | } |