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