Commit | Line | Data |
---|---|---|
8020ceb5 | 1 | /* |
7dd08bec | 2 | * lttng-events.c |
8020ceb5 | 3 | * |
8020ceb5 MD |
4 | * Holds LTTng per-session event registry. |
5 | * | |
e92f3e28 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
8020ceb5 MD |
21 | */ |
22 | ||
b5234c06 MD |
23 | #define _GNU_SOURCE |
24 | #include <stdio.h> | |
25 | #include <urcu/list.h> | |
8165c8da | 26 | #include <urcu/hlist.h> |
b5234c06 | 27 | #include <pthread.h> |
b5234c06 | 28 | #include <errno.h> |
f4681817 MD |
29 | #include <sys/shm.h> |
30 | #include <sys/ipc.h> | |
44c72f10 MD |
31 | #include <stdint.h> |
32 | #include <stddef.h> | |
28b12049 MD |
33 | #include <inttypes.h> |
34 | #include <time.h> | |
2ae57758 | 35 | #include <lttng/ust-endian.h> |
28b12049 | 36 | #include "clock.h" |
44c72f10 MD |
37 | |
38 | #include <urcu-bp.h> | |
39 | #include <urcu/compiler.h> | |
40 | #include <urcu/uatomic.h> | |
41 | #include <urcu/arch.h> | |
42 | ||
43 | #include <lttng/tracepoint.h> | |
4318ae1b | 44 | #include <lttng/ust-events.h> |
44c72f10 MD |
45 | |
46 | #include <usterr-signal-safe.h> | |
47 | #include <helper.h> | |
7d3e35b6 | 48 | #include <lttng/ust-ctl.h> |
32ce8569 | 49 | #include <ust-comm.h> |
1f18504e | 50 | #include "error.h" |
08114193 | 51 | #include "compat.h" |
eda498b8 | 52 | #include "lttng-ust-uuid.h" |
44c72f10 | 53 | |
457a6b58 | 54 | #include "tracepoint-internal.h" |
7dd08bec MD |
55 | #include "lttng-tracer.h" |
56 | #include "lttng-tracer-core.h" | |
cf73e0fe | 57 | #include "lttng-ust-statedump.h" |
b728d87e | 58 | #include "wait.h" |
8d8a24c8 | 59 | #include "../libringbuffer/shm.h" |
596c4223 | 60 | #include "jhash.h" |
8165c8da MD |
61 | |
62 | /* | |
3327ac33 MD |
63 | * All operations within this file are called by the communication |
64 | * thread, under ust_lock protection. | |
8165c8da | 65 | */ |
8165c8da | 66 | |
b5234c06 | 67 | static CDS_LIST_HEAD(sessions); |
8165c8da | 68 | |
37dddb65 MD |
69 | struct cds_list_head *_lttng_get_sessions(void) |
70 | { | |
71 | return &sessions; | |
72 | } | |
73 | ||
7dd08bec | 74 | static void _lttng_event_destroy(struct lttng_event *event); |
c785c634 | 75 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 76 | |
e58095ef MD |
77 | static |
78 | void lttng_session_lazy_sync_enablers(struct lttng_session *session); | |
79 | static | |
80 | void lttng_session_sync_enablers(struct lttng_session *session); | |
81 | static | |
82 | void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
83 | ||
6715d7d1 MD |
84 | /* |
85 | * Called with ust lock held. | |
86 | */ | |
87 | int lttng_session_active(void) | |
88 | { | |
89 | struct lttng_session *iter; | |
90 | ||
91 | cds_list_for_each_entry(iter, &sessions, node) { | |
92 | if (iter->active) | |
93 | return 1; | |
94 | } | |
95 | return 0; | |
96 | } | |
97 | ||
e58095ef MD |
98 | static |
99 | int lttng_loglevel_match(int loglevel, | |
100 | unsigned int has_loglevel, | |
457a6b58 MD |
101 | enum lttng_ust_loglevel_type req_type, |
102 | int req_loglevel) | |
103 | { | |
e58095ef MD |
104 | if (!has_loglevel) |
105 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
106 | switch (req_type) { |
107 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 108 | if (loglevel <= req_loglevel |
67ada458 | 109 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
110 | return 1; |
111 | else | |
112 | return 0; | |
113 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 114 | if (loglevel == req_loglevel |
67ada458 | 115 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
116 | return 1; |
117 | else | |
118 | return 0; | |
119 | case LTTNG_UST_LOGLEVEL_ALL: | |
120 | default: | |
67ada458 | 121 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
122 | return 1; |
123 | else | |
124 | return 0; | |
457a6b58 MD |
125 | } |
126 | } | |
127 | ||
8020ceb5 MD |
128 | void synchronize_trace(void) |
129 | { | |
8020ceb5 | 130 | synchronize_rcu(); |
8020ceb5 MD |
131 | } |
132 | ||
7dd08bec | 133 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 134 | { |
7dd08bec | 135 | struct lttng_session *session; |
74d81a6c | 136 | int i; |
8020ceb5 | 137 | |
7dd08bec | 138 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
139 | if (!session) |
140 | return NULL; | |
e58095ef MD |
141 | CDS_INIT_LIST_HEAD(&session->chan_head); |
142 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 143 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 144 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
145 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
146 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
147 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
148 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 149 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
150 | return session; |
151 | } | |
152 | ||
74d81a6c MD |
153 | /* |
154 | * Only used internally at session destruction. | |
155 | */ | |
156 | static | |
157 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
158 | { | |
159 | struct channel *chan; | |
160 | struct lttng_ust_shm_handle *handle; | |
161 | ||
162 | cds_list_del(<tng_chan->node); | |
163 | lttng_destroy_context(lttng_chan->ctx); | |
164 | chan = lttng_chan->chan; | |
165 | handle = lttng_chan->handle; | |
166 | /* | |
167 | * note: lttng_chan is private data contained within handle. It | |
168 | * will be freed along with the handle. | |
169 | */ | |
170 | channel_destroy(chan, handle, 0); | |
171 | } | |
172 | ||
ac6b4ac6 MD |
173 | static |
174 | void register_event(struct lttng_event *event) | |
175 | { | |
176 | int ret; | |
177 | const struct lttng_event_desc *desc; | |
178 | ||
179 | assert(event->registered == 0); | |
180 | desc = event->desc; | |
181 | ret = __tracepoint_probe_register(desc->name, | |
182 | desc->probe_callback, | |
183 | event, desc->signature); | |
184 | WARN_ON_ONCE(ret); | |
185 | if (!ret) | |
186 | event->registered = 1; | |
187 | } | |
188 | ||
189 | static | |
190 | void unregister_event(struct lttng_event *event) | |
191 | { | |
192 | int ret; | |
193 | const struct lttng_event_desc *desc; | |
194 | ||
195 | assert(event->registered == 1); | |
196 | desc = event->desc; | |
197 | ret = __tracepoint_probe_unregister(desc->name, | |
198 | desc->probe_callback, | |
199 | event); | |
200 | WARN_ON_ONCE(ret); | |
201 | if (!ret) | |
202 | event->registered = 0; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Only used internally at session destruction. | |
207 | */ | |
208 | static | |
209 | void _lttng_event_unregister(struct lttng_event *event) | |
210 | { | |
211 | if (event->registered) | |
212 | unregister_event(event); | |
213 | } | |
214 | ||
7dd08bec | 215 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 216 | { |
7dd08bec MD |
217 | struct lttng_channel *chan, *tmpchan; |
218 | struct lttng_event *event, *tmpevent; | |
c785c634 | 219 | struct lttng_enum *_enum, *tmp_enum; |
e58095ef | 220 | struct lttng_enabler *enabler, *tmpenabler; |
8020ceb5 | 221 | |
b5234c06 | 222 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 223 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 224 | _lttng_event_unregister(event); |
8020ceb5 MD |
225 | } |
226 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e58095ef MD |
227 | cds_list_for_each_entry_safe(enabler, tmpenabler, |
228 | &session->enablers_head, node) | |
229 | lttng_enabler_destroy(enabler); | |
230 | cds_list_for_each_entry_safe(event, tmpevent, | |
231 | &session->events_head, node) | |
7dd08bec | 232 | _lttng_event_destroy(event); |
c785c634 MD |
233 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
234 | &session->enums_head, node) | |
235 | _lttng_enum_destroy(_enum); | |
e58095ef | 236 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 237 | _lttng_channel_unmap(chan); |
e58095ef | 238 | cds_list_del(&session->node); |
b5234c06 | 239 | free(session); |
8020ceb5 MD |
240 | } |
241 | ||
7dd08bec | 242 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
243 | { |
244 | int ret = 0; | |
7dd08bec | 245 | struct lttng_channel *chan; |
32ce8569 | 246 | int notify_socket; |
8020ceb5 | 247 | |
8020ceb5 MD |
248 | if (session->active) { |
249 | ret = -EBUSY; | |
250 | goto end; | |
251 | } | |
252 | ||
32ce8569 MD |
253 | notify_socket = lttng_get_notify_socket(session->owner); |
254 | if (notify_socket < 0) | |
255 | return notify_socket; | |
256 | ||
ac6b4ac6 MD |
257 | /* Set transient enabler state to "enabled" */ |
258 | session->tstate = 1; | |
e58095ef | 259 | |
8020ceb5 MD |
260 | /* |
261 | * Snapshot the number of events per channel to know the type of header | |
262 | * we need to use. | |
263 | */ | |
e58095ef | 264 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 265 | const struct lttng_ctx *ctx; |
83e43212 | 266 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 267 | size_t nr_fields = 0; |
6ca18e66 | 268 | uint32_t chan_id; |
32ce8569 MD |
269 | |
270 | /* don't change it if session stop/restart */ | |
8020ceb5 | 271 | if (chan->header_type) |
32ce8569 MD |
272 | continue; |
273 | ctx = chan->ctx; | |
274 | if (ctx) { | |
275 | nr_fields = ctx->nr_fields; | |
83e43212 | 276 | fields = ctx->fields; |
32ce8569 MD |
277 | } |
278 | ret = ustcomm_register_channel(notify_socket, | |
279 | session->objd, | |
280 | chan->objd, | |
281 | nr_fields, | |
282 | fields, | |
6ca18e66 | 283 | &chan_id, |
32ce8569 | 284 | &chan->header_type); |
b869b5ae MD |
285 | if (ret) { |
286 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 287 | return ret; |
b869b5ae | 288 | } |
6ca18e66 MD |
289 | if (chan_id != chan->id) { |
290 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
291 | chan_id, chan->id); | |
292 | return -EINVAL; | |
293 | } | |
8020ceb5 MD |
294 | } |
295 | ||
5c055275 FD |
296 | /* We need to sync enablers with session before activation. */ |
297 | lttng_session_sync_enablers(session); | |
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 | ||
c785c634 MD |
361 | static |
362 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
363 | struct lttng_session *session) | |
364 | { | |
365 | const char *enum_name = desc->name; | |
366 | struct lttng_enum *_enum; | |
367 | struct cds_hlist_head *head; | |
368 | struct cds_hlist_node *node; | |
369 | int ret = 0; | |
370 | size_t name_len = strlen(enum_name); | |
371 | uint32_t hash; | |
372 | int notify_socket; | |
373 | ||
374 | hash = jhash(enum_name, name_len, 0); | |
375 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
376 | cds_hlist_for_each_entry(_enum, node, head, hlist) { | |
377 | assert(_enum->desc); | |
378 | if (!strncmp(_enum->desc->name, desc->name, | |
379 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
380 | ret = -EEXIST; | |
381 | goto exist; | |
382 | } | |
383 | } | |
384 | ||
385 | notify_socket = lttng_get_notify_socket(session->owner); | |
386 | if (notify_socket < 0) { | |
387 | ret = notify_socket; | |
388 | goto socket_error; | |
389 | } | |
390 | ||
391 | _enum = zmalloc(sizeof(*_enum)); | |
392 | if (!_enum) { | |
393 | ret = -ENOMEM; | |
394 | goto cache_error; | |
395 | } | |
396 | _enum->session = session; | |
397 | _enum->desc = desc; | |
398 | ||
399 | ret = ustcomm_register_enum(notify_socket, | |
400 | session->objd, | |
401 | enum_name, | |
402 | desc->nr_entries, | |
403 | desc->entries, | |
404 | &_enum->id); | |
405 | if (ret < 0) { | |
406 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
407 | goto sessiond_register_error; | |
408 | } | |
409 | cds_list_add(&_enum->node, &session->enums_head); | |
410 | cds_hlist_add_head(&_enum->hlist, head); | |
411 | return 0; | |
412 | ||
413 | sessiond_register_error: | |
414 | free(_enum); | |
415 | cache_error: | |
416 | socket_error: | |
417 | exist: | |
418 | return ret; | |
419 | } | |
420 | ||
421 | static | |
422 | int lttng_event_create_all_enums(const struct lttng_event_desc *desc, | |
423 | struct lttng_session *session) | |
424 | { | |
425 | unsigned int nr_fields, i; | |
426 | const struct lttng_event_field *fields; | |
427 | ||
428 | /* For each field, ensure enum is part of the session. */ | |
429 | nr_fields = desc->nr_fields; | |
430 | fields = desc->fields; | |
431 | for (i = 0; i < nr_fields; i++) { | |
432 | const struct lttng_type *type = &fields[i].type; | |
433 | ||
434 | switch (type->atype) { | |
435 | case atype_enum: | |
436 | { | |
437 | const struct lttng_enum_desc *enum_desc; | |
438 | int ret; | |
439 | ||
440 | enum_desc = type->u.basic.enumeration.desc; | |
441 | ret = lttng_enum_create(enum_desc, session); | |
442 | if (ret && ret != -EEXIST) { | |
443 | DBG("Unable to create enum error: (%d)", ret); | |
444 | return ret; | |
445 | } | |
446 | break; | |
447 | } | |
448 | default: | |
449 | /* TODO: nested types when they become supported. */ | |
450 | continue; | |
451 | } | |
452 | } | |
453 | return 0; | |
454 | } | |
455 | ||
8020ceb5 MD |
456 | /* |
457 | * Supports event creation while tracing session is active. | |
458 | */ | |
e58095ef MD |
459 | static |
460 | int lttng_event_create(const struct lttng_event_desc *desc, | |
461 | struct lttng_channel *chan) | |
8020ceb5 | 462 | { |
e58095ef | 463 | const char *event_name = desc->name; |
7dd08bec | 464 | struct lttng_event *event; |
32ce8569 | 465 | struct lttng_session *session = chan->session; |
d56fa719 MD |
466 | struct cds_hlist_head *head; |
467 | struct cds_hlist_node *node; | |
576599a0 | 468 | int ret = 0; |
d56fa719 MD |
469 | size_t name_len = strlen(event_name); |
470 | uint32_t hash; | |
32ce8569 MD |
471 | int notify_socket, loglevel; |
472 | const char *uri; | |
8020ceb5 | 473 | |
d56fa719 MD |
474 | hash = jhash(event_name, name_len, 0); |
475 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
476 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef | 477 | assert(event->desc); |
d970f72e MD |
478 | if (!strncmp(event->desc->name, desc->name, |
479 | LTTNG_UST_SYM_NAME_LEN - 1) | |
480 | && chan == event->chan) { | |
576599a0 | 481 | ret = -EEXIST; |
8020ceb5 | 482 | goto exist; |
576599a0 MD |
483 | } |
484 | } | |
457a6b58 | 485 | |
32ce8569 MD |
486 | notify_socket = lttng_get_notify_socket(session->owner); |
487 | if (notify_socket < 0) { | |
488 | ret = notify_socket; | |
489 | goto socket_error; | |
490 | } | |
491 | ||
c785c634 MD |
492 | ret = lttng_event_create_all_enums(desc, session); |
493 | if (ret < 0) { | |
494 | DBG("Error (%d) adding enum to session", ret); | |
495 | goto create_enum_error; | |
496 | } | |
497 | ||
457a6b58 MD |
498 | /* |
499 | * Check if loglevel match. Refuse to connect event if not. | |
500 | */ | |
7dd08bec | 501 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
502 | if (!event) { |
503 | ret = -ENOMEM; | |
8020ceb5 | 504 | goto cache_error; |
576599a0 | 505 | } |
8020ceb5 | 506 | event->chan = chan; |
e58095ef | 507 | |
ac6b4ac6 MD |
508 | /* Event will be enabled by enabler sync. */ |
509 | event->enabled = 0; | |
510 | event->registered = 0; | |
e58095ef MD |
511 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
512 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
513 | event->desc = desc; | |
32ce8569 MD |
514 | |
515 | if (desc->loglevel) | |
516 | loglevel = *(*event->desc->loglevel); | |
517 | else | |
518 | loglevel = TRACE_DEFAULT; | |
519 | if (desc->u.ext.model_emf_uri) | |
520 | uri = *(desc->u.ext.model_emf_uri); | |
521 | else | |
522 | uri = NULL; | |
523 | ||
13b21cd6 MD |
524 | /* Fetch event ID from sessiond */ |
525 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 526 | session, |
13b21cd6 MD |
527 | session->objd, |
528 | chan->objd, | |
529 | event_name, | |
530 | loglevel, | |
531 | desc->signature, | |
532 | desc->nr_fields, | |
533 | desc->fields, | |
534 | uri, | |
535 | &event->id); | |
536 | if (ret < 0) { | |
537 | DBG("Error (%d) registering event to sessiond", ret); | |
538 | goto sessiond_register_error; | |
32ce8569 | 539 | } |
2b213b16 | 540 | |
7dd08bec | 541 | /* Populate lttng_event structure before tracepoint registration. */ |
b5234c06 | 542 | cmm_smp_wmb(); |
e58095ef | 543 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 544 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 545 | return 0; |
8020ceb5 | 546 | |
32ce8569 | 547 | sessiond_register_error: |
b5234c06 | 548 | free(event); |
8020ceb5 | 549 | cache_error: |
c785c634 | 550 | create_enum_error: |
32ce8569 | 551 | socket_error: |
8020ceb5 | 552 | exist: |
576599a0 | 553 | return ret; |
8020ceb5 MD |
554 | } |
555 | ||
e58095ef MD |
556 | static |
557 | int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, | |
558 | struct lttng_enabler *enabler) | |
559 | { | |
560 | int loglevel = 0; | |
7e2e405c | 561 | unsigned int has_loglevel = 0; |
e58095ef MD |
562 | |
563 | assert(enabler->type == LTTNG_ENABLER_WILDCARD); | |
564 | /* Compare excluding final '*' */ | |
565 | if (strncmp(desc->name, enabler->event_param.name, | |
566 | strlen(enabler->event_param.name) - 1)) | |
567 | return 0; | |
568 | if (desc->loglevel) { | |
569 | loglevel = *(*desc->loglevel); | |
570 | has_loglevel = 1; | |
571 | } | |
572 | if (!lttng_loglevel_match(loglevel, | |
573 | has_loglevel, | |
574 | enabler->event_param.loglevel_type, | |
575 | enabler->event_param.loglevel)) | |
576 | return 0; | |
577 | return 1; | |
578 | } | |
579 | ||
580 | static | |
581 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
582 | struct lttng_enabler *enabler) | |
583 | { | |
584 | int loglevel = 0; | |
585 | unsigned int has_loglevel = 0; | |
586 | ||
587 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
588 | if (strcmp(desc->name, enabler->event_param.name)) | |
589 | return 0; | |
590 | if (desc->loglevel) { | |
591 | loglevel = *(*desc->loglevel); | |
592 | has_loglevel = 1; | |
593 | } | |
594 | if (!lttng_loglevel_match(loglevel, | |
595 | has_loglevel, | |
596 | enabler->event_param.loglevel_type, | |
597 | enabler->event_param.loglevel)) | |
598 | return 0; | |
599 | return 1; | |
600 | } | |
601 | ||
602 | static | |
603 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
604 | struct lttng_enabler *enabler) | |
605 | { | |
ed5b5bbd JI |
606 | struct lttng_ust_excluder_node *excluder; |
607 | ||
608 | /* If event matches with an excluder, return 'does not match' */ | |
609 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
610 | int count; | |
611 | ||
612 | for (count = 0; count < excluder->excluder.count; count++) { | |
613 | int found, len; | |
614 | char *excluder_name; | |
615 | ||
616 | excluder_name = (char *) (excluder->excluder.names) | |
617 | + count * LTTNG_UST_SYM_NAME_LEN; | |
618 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
619 | if (len > 0 && excluder_name[len - 1] == '*') { | |
620 | found = !strncmp(desc->name, excluder_name, | |
621 | len - 1); | |
622 | } else { | |
623 | found = !strncmp(desc->name, excluder_name, | |
624 | LTTNG_UST_SYM_NAME_LEN - 1); | |
625 | } | |
626 | if (found) { | |
627 | return 0; | |
628 | } | |
629 | } | |
630 | } | |
e58095ef MD |
631 | switch (enabler->type) { |
632 | case LTTNG_ENABLER_WILDCARD: | |
633 | return lttng_desc_match_wildcard_enabler(desc, enabler); | |
634 | case LTTNG_ENABLER_EVENT: | |
635 | return lttng_desc_match_event_enabler(desc, enabler); | |
636 | default: | |
637 | return -EINVAL; | |
638 | } | |
639 | } | |
640 | ||
641 | static | |
642 | int lttng_event_match_enabler(struct lttng_event *event, | |
643 | struct lttng_enabler *enabler) | |
644 | { | |
d970f72e MD |
645 | if (lttng_desc_match_enabler(event->desc, enabler) |
646 | && event->chan == enabler->chan) | |
647 | return 1; | |
648 | else | |
649 | return 0; | |
e58095ef MD |
650 | } |
651 | ||
652 | static | |
653 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
654 | struct lttng_enabler *enabler) | |
655 | { | |
656 | struct lttng_enabler_ref *enabler_ref; | |
657 | ||
658 | cds_list_for_each_entry(enabler_ref, | |
659 | &event->enablers_ref_head, node) { | |
660 | if (enabler_ref->ref == enabler) | |
661 | return enabler_ref; | |
662 | } | |
663 | return NULL; | |
664 | } | |
665 | ||
8020ceb5 | 666 | /* |
e58095ef MD |
667 | * Create struct lttng_event if it is missing and present in the list of |
668 | * tracepoint probes. | |
8020ceb5 | 669 | */ |
e58095ef MD |
670 | static |
671 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 672 | { |
e58095ef MD |
673 | struct lttng_session *session = enabler->chan->session; |
674 | struct lttng_probe_desc *probe_desc; | |
675 | const struct lttng_event_desc *desc; | |
676 | struct lttng_event *event; | |
677 | int i; | |
678 | struct cds_list_head *probe_list; | |
679 | ||
680 | probe_list = lttng_get_probe_list_head(); | |
681 | /* | |
682 | * For each probe event, if we find that a probe event matches | |
683 | * our enabler, create an associated lttng_event if not | |
684 | * already present. | |
685 | */ | |
686 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
687 | for (i = 0; i < probe_desc->nr_events; i++) { | |
688 | int found = 0, ret; | |
d56fa719 MD |
689 | struct cds_hlist_head *head; |
690 | struct cds_hlist_node *node; | |
691 | const char *event_name; | |
692 | size_t name_len; | |
693 | uint32_t hash; | |
e58095ef MD |
694 | |
695 | desc = probe_desc->event_desc[i]; | |
696 | if (!lttng_desc_match_enabler(desc, enabler)) | |
697 | continue; | |
d56fa719 MD |
698 | event_name = desc->name; |
699 | name_len = strlen(event_name); | |
e58095ef MD |
700 | |
701 | /* | |
d56fa719 | 702 | * Check if already created. |
e58095ef | 703 | */ |
d56fa719 MD |
704 | hash = jhash(event_name, name_len, 0); |
705 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
706 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
d970f72e MD |
707 | if (event->desc == desc |
708 | && event->chan == enabler->chan) | |
e58095ef MD |
709 | found = 1; |
710 | } | |
711 | if (found) | |
712 | continue; | |
713 | ||
714 | /* | |
715 | * We need to create an event for this | |
716 | * event probe. | |
717 | */ | |
718 | ret = lttng_event_create(probe_desc->event_desc[i], | |
719 | enabler->chan); | |
720 | if (ret) { | |
32ce8569 MD |
721 | DBG("Unable to create event %s, error %d\n", |
722 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 723 | } |
8165c8da | 724 | } |
8020ceb5 | 725 | } |
8020ceb5 MD |
726 | } |
727 | ||
728 | /* | |
e58095ef MD |
729 | * Create events associated with an enabler (if not already present), |
730 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
731 | */ |
732 | static | |
e58095ef | 733 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 734 | { |
e58095ef MD |
735 | struct lttng_session *session = enabler->chan->session; |
736 | struct lttng_event *event; | |
737 | ||
738 | /* First ensure that probe events are created for this enabler. */ | |
739 | lttng_create_event_if_missing(enabler); | |
740 | ||
741 | /* For each event matching enabler in session event list. */ | |
742 | cds_list_for_each_entry(event, &session->events_head, node) { | |
743 | struct lttng_enabler_ref *enabler_ref; | |
744 | ||
745 | if (!lttng_event_match_enabler(event, enabler)) | |
746 | continue; | |
747 | ||
748 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
749 | if (!enabler_ref) { | |
750 | /* | |
751 | * If no backward ref, create it. | |
752 | * Add backward ref from event to enabler. | |
753 | */ | |
754 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
755 | if (!enabler_ref) | |
756 | return -ENOMEM; | |
757 | enabler_ref->ref = enabler; | |
758 | cds_list_add(&enabler_ref->node, | |
759 | &event->enablers_ref_head); | |
8165c8da | 760 | } |
e58095ef MD |
761 | |
762 | /* | |
763 | * Link filter bytecodes if not linked yet. | |
764 | */ | |
765 | lttng_enabler_event_link_bytecode(event, enabler); | |
766 | ||
767 | /* TODO: merge event context. */ | |
768 | } | |
769 | return 0; | |
770 | } | |
771 | ||
772 | /* | |
773 | * Called at library load: connect the probe on all enablers matching | |
774 | * this event. | |
5f733922 | 775 | * Called with session mutex held. |
e58095ef | 776 | */ |
5f733922 | 777 | int lttng_fix_pending_events(void) |
e58095ef MD |
778 | { |
779 | struct lttng_session *session; | |
780 | ||
781 | cds_list_for_each_entry(session, &sessions, node) { | |
782 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 783 | } |
e58095ef MD |
784 | return 0; |
785 | } | |
786 | ||
246be17e | 787 | /* |
37dddb65 MD |
788 | * For each session of the owner thread, execute pending statedump. |
789 | * Only dump state for the sessions owned by the caller thread, because | |
790 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 791 | */ |
3327ac33 | 792 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
793 | { |
794 | struct lttng_session *session; | |
795 | ||
37dddb65 | 796 | /* Execute state dump */ |
cf73e0fe | 797 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
798 | |
799 | /* Clear pending state dump */ | |
3327ac33 MD |
800 | if (ust_lock()) { |
801 | goto end; | |
802 | } | |
246be17e | 803 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
804 | if (session->owner != owner) |
805 | continue; | |
806 | if (!session->statedump_pending) | |
807 | continue; | |
808 | session->statedump_pending = 0; | |
246be17e | 809 | } |
3327ac33 | 810 | end: |
37dddb65 | 811 | ust_unlock(); |
3327ac33 | 812 | return; |
246be17e PW |
813 | } |
814 | ||
e58095ef MD |
815 | /* |
816 | * Only used internally at session destruction. | |
817 | */ | |
818 | static | |
819 | void _lttng_event_destroy(struct lttng_event *event) | |
820 | { | |
821 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
822 | ||
e58095ef | 823 | cds_list_del(&event->node); |
8020ceb5 | 824 | lttng_destroy_context(event->ctx); |
f488575f | 825 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
826 | /* Free event enabler refs */ |
827 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
828 | &event->enablers_ref_head, node) | |
829 | free(enabler_ref); | |
b5234c06 | 830 | free(event); |
8020ceb5 MD |
831 | } |
832 | ||
c785c634 MD |
833 | static |
834 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
835 | { | |
836 | cds_list_del(&_enum->node); | |
837 | free(_enum); | |
838 | } | |
839 | ||
003fedf4 | 840 | void lttng_ust_events_exit(void) |
8020ceb5 | 841 | { |
7dd08bec | 842 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 843 | |
e58095ef | 844 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 845 | lttng_session_destroy(session); |
8020ceb5 | 846 | } |
457a6b58 | 847 | |
e58095ef MD |
848 | /* |
849 | * Enabler management. | |
850 | */ | |
851 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
852 | struct lttng_ust_event *event_param, | |
853 | struct lttng_channel *chan) | |
457a6b58 | 854 | { |
e58095ef MD |
855 | struct lttng_enabler *enabler; |
856 | ||
857 | enabler = zmalloc(sizeof(*enabler)); | |
858 | if (!enabler) | |
859 | return NULL; | |
860 | enabler->type = type; | |
861 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
0f63324a | 862 | CDS_INIT_LIST_HEAD(&enabler->excluder_head); |
e58095ef MD |
863 | memcpy(&enabler->event_param, event_param, |
864 | sizeof(enabler->event_param)); | |
865 | enabler->chan = chan; | |
866 | /* ctx left NULL */ | |
89f26d57 | 867 | enabler->enabled = 0; |
e58095ef MD |
868 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); |
869 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
870 | return enabler; | |
457a6b58 MD |
871 | } |
872 | ||
e58095ef | 873 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 874 | { |
e58095ef MD |
875 | enabler->enabled = 1; |
876 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
877 | return 0; | |
457a6b58 | 878 | } |
457a6b58 | 879 | |
e58095ef | 880 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 881 | { |
e58095ef MD |
882 | enabler->enabled = 0; |
883 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
884 | return 0; | |
885 | } | |
457a6b58 | 886 | |
e58095ef MD |
887 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
888 | struct lttng_ust_filter_bytecode_node *bytecode) | |
889 | { | |
890 | bytecode->enabler = enabler; | |
891 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
892 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
893 | return 0; | |
0bfb5cbd JI |
894 | } |
895 | ||
896 | int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
897 | struct lttng_ust_excluder_node *excluder) | |
898 | { | |
899 | excluder->enabler = enabler; | |
900 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
901 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
902 | return 0; | |
e58095ef | 903 | } |
f488575f | 904 | |
e58095ef MD |
905 | int lttng_attach_context(struct lttng_ust_context *context_param, |
906 | struct lttng_ctx **ctx, struct lttng_session *session) | |
907 | { | |
457a6b58 | 908 | /* |
e58095ef MD |
909 | * We cannot attach a context after trace has been started for a |
910 | * session because the metadata does not allow expressing this | |
911 | * information outside of the original channel scope. | |
457a6b58 | 912 | */ |
e58095ef MD |
913 | if (session->been_active) |
914 | return -EPERM; | |
457a6b58 | 915 | |
e58095ef MD |
916 | switch (context_param->ctx) { |
917 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
918 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
919 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
920 | { | |
921 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
922 | ||
923 | perf_ctx_param = &context_param->u.perf_counter; | |
924 | return lttng_add_perf_counter_to_ctx( | |
925 | perf_ctx_param->type, | |
926 | perf_ctx_param->config, | |
927 | perf_ctx_param->name, | |
928 | ctx); | |
929 | } | |
e58095ef MD |
930 | case LTTNG_UST_CONTEXT_VTID: |
931 | return lttng_add_vtid_to_ctx(ctx); | |
932 | case LTTNG_UST_CONTEXT_VPID: | |
933 | return lttng_add_vpid_to_ctx(ctx); | |
934 | case LTTNG_UST_CONTEXT_PROCNAME: | |
935 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
936 | case LTTNG_UST_CONTEXT_IP: |
937 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
938 | case LTTNG_UST_CONTEXT_CPU_ID: |
939 | return lttng_add_cpu_id_to_ctx(ctx); | |
e58095ef MD |
940 | default: |
941 | return -EINVAL; | |
457a6b58 | 942 | } |
457a6b58 MD |
943 | } |
944 | ||
e58095ef MD |
945 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
946 | struct lttng_ust_context *context_param) | |
457a6b58 | 947 | { |
e58095ef MD |
948 | #if 0 // disabled for now. |
949 | struct lttng_session *session = enabler->chan->session; | |
950 | int ret; | |
457a6b58 | 951 | |
e58095ef MD |
952 | ret = lttng_attach_context(context_param, &enabler->ctx, |
953 | session); | |
954 | if (ret) | |
955 | return ret; | |
956 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
957 | #endif | |
958 | return -ENOSYS; | |
457a6b58 MD |
959 | } |
960 | ||
e58095ef MD |
961 | static |
962 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 963 | { |
e58095ef | 964 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
0f63324a | 965 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
457a6b58 | 966 | |
e58095ef MD |
967 | /* Destroy filter bytecode */ |
968 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
969 | &enabler->filter_bytecode_head, node) { | |
970 | free(filter_node); | |
457a6b58 | 971 | } |
e58095ef | 972 | |
0f63324a JI |
973 | /* Destroy excluders */ |
974 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
975 | &enabler->excluder_head, node) { | |
976 | free(excluder_node); | |
977 | } | |
978 | ||
e58095ef MD |
979 | /* Destroy contexts */ |
980 | lttng_destroy_context(enabler->ctx); | |
981 | ||
982 | cds_list_del(&enabler->node); | |
983 | free(enabler); | |
457a6b58 MD |
984 | } |
985 | ||
e58095ef MD |
986 | /* |
987 | * lttng_session_sync_enablers should be called just before starting a | |
988 | * session. | |
989 | */ | |
457a6b58 | 990 | static |
e58095ef | 991 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 992 | { |
e58095ef MD |
993 | struct lttng_enabler *enabler; |
994 | struct lttng_event *event; | |
457a6b58 | 995 | |
e58095ef MD |
996 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
997 | lttng_enabler_ref_events(enabler); | |
998 | /* | |
999 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1000 | * and its channel and session transient states are enabled, we |
1001 | * enable the event, else we disable it. | |
e58095ef MD |
1002 | */ |
1003 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1004 | struct lttng_enabler_ref *enabler_ref; | |
1005 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1006 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1007 | |
1008 | /* Enable events */ | |
1009 | cds_list_for_each_entry(enabler_ref, | |
1010 | &event->enablers_ref_head, node) { | |
1011 | if (enabler_ref->ref->enabled) { | |
1012 | enabled = 1; | |
1013 | break; | |
1014 | } | |
1015 | } | |
ac6b4ac6 MD |
1016 | /* |
1017 | * Enabled state is based on union of enablers, with | |
1018 | * intesection of session and channel transient enable | |
1019 | * states. | |
1020 | */ | |
1021 | enabled = enabled && session->tstate && event->chan->tstate; | |
1022 | ||
1023 | CMM_STORE_SHARED(event->enabled, enabled); | |
1024 | /* | |
1025 | * Sync tracepoint registration with event enabled | |
1026 | * state. | |
1027 | */ | |
1028 | if (enabled) { | |
1029 | if (!event->registered) | |
1030 | register_event(event); | |
1031 | } else { | |
1032 | if (event->registered) | |
1033 | unregister_event(event); | |
1034 | } | |
457a6b58 | 1035 | |
1f49fc05 | 1036 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1037 | cds_list_for_each_entry(enabler_ref, |
1038 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1039 | if (enabler_ref->ref->enabled |
1040 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1041 | has_enablers_without_bytecode = 1; |
1042 | break; | |
1043 | } | |
1044 | } | |
1045 | event->has_enablers_without_bytecode = | |
1046 | has_enablers_without_bytecode; | |
1047 | ||
e58095ef MD |
1048 | /* Enable filters */ |
1049 | cds_list_for_each_entry(runtime, | |
1050 | &event->bytecode_runtime_head, node) { | |
1051 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
1052 | } |
1053 | } | |
457a6b58 MD |
1054 | } |
1055 | ||
e58095ef MD |
1056 | /* |
1057 | * Apply enablers to session events, adding events to session if need | |
1058 | * be. It is required after each modification applied to an active | |
1059 | * session, and right before session "start". | |
1060 | * "lazy" sync means we only sync if required. | |
1061 | */ | |
1062 | static | |
1063 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 1064 | { |
e58095ef MD |
1065 | /* We can skip if session is not active */ |
1066 | if (!session->active) | |
1067 | return; | |
1068 | lttng_session_sync_enablers(session); | |
457a6b58 | 1069 | } |