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 | ||
3fbec7dc | 23 | #define _LGPL_SOURCE |
b5234c06 MD |
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> | |
196ec2df | 35 | #include <stdbool.h> |
2ae57758 | 36 | #include <lttng/ust-endian.h> |
28b12049 | 37 | #include "clock.h" |
44c72f10 MD |
38 | |
39 | #include <urcu-bp.h> | |
40 | #include <urcu/compiler.h> | |
41 | #include <urcu/uatomic.h> | |
42 | #include <urcu/arch.h> | |
43 | ||
44 | #include <lttng/tracepoint.h> | |
4318ae1b | 45 | #include <lttng/ust-events.h> |
44c72f10 MD |
46 | |
47 | #include <usterr-signal-safe.h> | |
48 | #include <helper.h> | |
7d3e35b6 | 49 | #include <lttng/ust-ctl.h> |
32ce8569 | 50 | #include <ust-comm.h> |
53569322 MD |
51 | #include <lttng/ust-dynamic-type.h> |
52 | #include <lttng/ust-context-provider.h> | |
1f18504e | 53 | #include "error.h" |
08114193 | 54 | #include "compat.h" |
eda498b8 | 55 | #include "lttng-ust-uuid.h" |
44c72f10 | 56 | |
457a6b58 | 57 | #include "tracepoint-internal.h" |
196ec2df | 58 | #include "string-utils.h" |
7dd08bec MD |
59 | #include "lttng-tracer.h" |
60 | #include "lttng-tracer-core.h" | |
cf73e0fe | 61 | #include "lttng-ust-statedump.h" |
b728d87e | 62 | #include "wait.h" |
8d8a24c8 | 63 | #include "../libringbuffer/shm.h" |
596c4223 | 64 | #include "jhash.h" |
8165c8da MD |
65 | |
66 | /* | |
3327ac33 MD |
67 | * All operations within this file are called by the communication |
68 | * thread, under ust_lock protection. | |
8165c8da | 69 | */ |
8165c8da | 70 | |
b5234c06 | 71 | static CDS_LIST_HEAD(sessions); |
8165c8da | 72 | |
37dddb65 MD |
73 | struct cds_list_head *_lttng_get_sessions(void) |
74 | { | |
75 | return &sessions; | |
76 | } | |
77 | ||
7dd08bec | 78 | static void _lttng_event_destroy(struct lttng_event *event); |
c785c634 | 79 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 80 | |
e58095ef MD |
81 | static |
82 | void lttng_session_lazy_sync_enablers(struct lttng_session *session); | |
83 | static | |
84 | void lttng_session_sync_enablers(struct lttng_session *session); | |
85 | static | |
86 | void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
87 | ||
6715d7d1 MD |
88 | /* |
89 | * Called with ust lock held. | |
90 | */ | |
91 | int lttng_session_active(void) | |
92 | { | |
93 | struct lttng_session *iter; | |
94 | ||
95 | cds_list_for_each_entry(iter, &sessions, node) { | |
96 | if (iter->active) | |
97 | return 1; | |
98 | } | |
99 | return 0; | |
100 | } | |
101 | ||
e58095ef MD |
102 | static |
103 | int lttng_loglevel_match(int loglevel, | |
104 | unsigned int has_loglevel, | |
457a6b58 MD |
105 | enum lttng_ust_loglevel_type req_type, |
106 | int req_loglevel) | |
107 | { | |
e58095ef MD |
108 | if (!has_loglevel) |
109 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
110 | switch (req_type) { |
111 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 112 | if (loglevel <= req_loglevel |
67ada458 | 113 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
114 | return 1; |
115 | else | |
116 | return 0; | |
117 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 118 | if (loglevel == req_loglevel |
67ada458 | 119 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
120 | return 1; |
121 | else | |
122 | return 0; | |
123 | case LTTNG_UST_LOGLEVEL_ALL: | |
124 | default: | |
67ada458 | 125 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
126 | return 1; |
127 | else | |
128 | return 0; | |
457a6b58 MD |
129 | } |
130 | } | |
131 | ||
8020ceb5 MD |
132 | void synchronize_trace(void) |
133 | { | |
8020ceb5 | 134 | synchronize_rcu(); |
8020ceb5 MD |
135 | } |
136 | ||
7dd08bec | 137 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 138 | { |
7dd08bec | 139 | struct lttng_session *session; |
74d81a6c | 140 | int i; |
8020ceb5 | 141 | |
7dd08bec | 142 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
143 | if (!session) |
144 | return NULL; | |
53569322 MD |
145 | if (lttng_session_context_init(&session->ctx)) { |
146 | free(session); | |
147 | return NULL; | |
148 | } | |
e58095ef MD |
149 | CDS_INIT_LIST_HEAD(&session->chan_head); |
150 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 151 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 152 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
153 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
154 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
155 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
156 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 157 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
158 | return session; |
159 | } | |
160 | ||
74d81a6c MD |
161 | /* |
162 | * Only used internally at session destruction. | |
163 | */ | |
164 | static | |
165 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
166 | { | |
167 | struct channel *chan; | |
168 | struct lttng_ust_shm_handle *handle; | |
169 | ||
170 | cds_list_del(<tng_chan->node); | |
171 | lttng_destroy_context(lttng_chan->ctx); | |
172 | chan = lttng_chan->chan; | |
173 | handle = lttng_chan->handle; | |
174 | /* | |
175 | * note: lttng_chan is private data contained within handle. It | |
176 | * will be freed along with the handle. | |
177 | */ | |
178 | channel_destroy(chan, handle, 0); | |
179 | } | |
180 | ||
ac6b4ac6 MD |
181 | static |
182 | void register_event(struct lttng_event *event) | |
183 | { | |
184 | int ret; | |
185 | const struct lttng_event_desc *desc; | |
186 | ||
187 | assert(event->registered == 0); | |
188 | desc = event->desc; | |
baa1e0bc | 189 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
190 | desc->probe_callback, |
191 | event, desc->signature); | |
192 | WARN_ON_ONCE(ret); | |
193 | if (!ret) | |
194 | event->registered = 1; | |
195 | } | |
196 | ||
197 | static | |
198 | void unregister_event(struct lttng_event *event) | |
199 | { | |
200 | int ret; | |
201 | const struct lttng_event_desc *desc; | |
202 | ||
203 | assert(event->registered == 1); | |
204 | desc = event->desc; | |
baa1e0bc | 205 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
206 | desc->probe_callback, |
207 | event); | |
208 | WARN_ON_ONCE(ret); | |
209 | if (!ret) | |
210 | event->registered = 0; | |
211 | } | |
212 | ||
213 | /* | |
214 | * Only used internally at session destruction. | |
215 | */ | |
216 | static | |
217 | void _lttng_event_unregister(struct lttng_event *event) | |
218 | { | |
219 | if (event->registered) | |
220 | unregister_event(event); | |
221 | } | |
222 | ||
7dd08bec | 223 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 224 | { |
7dd08bec MD |
225 | struct lttng_channel *chan, *tmpchan; |
226 | struct lttng_event *event, *tmpevent; | |
c785c634 | 227 | struct lttng_enum *_enum, *tmp_enum; |
e58095ef | 228 | struct lttng_enabler *enabler, *tmpenabler; |
8020ceb5 | 229 | |
b5234c06 | 230 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 231 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 232 | _lttng_event_unregister(event); |
8020ceb5 MD |
233 | } |
234 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
baa1e0bc | 235 | __tracepoint_probe_prune_release_queue(); |
e58095ef MD |
236 | cds_list_for_each_entry_safe(enabler, tmpenabler, |
237 | &session->enablers_head, node) | |
238 | lttng_enabler_destroy(enabler); | |
239 | cds_list_for_each_entry_safe(event, tmpevent, | |
240 | &session->events_head, node) | |
7dd08bec | 241 | _lttng_event_destroy(event); |
c785c634 MD |
242 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
243 | &session->enums_head, node) | |
244 | _lttng_enum_destroy(_enum); | |
e58095ef | 245 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 246 | _lttng_channel_unmap(chan); |
e58095ef | 247 | cds_list_del(&session->node); |
53569322 | 248 | lttng_destroy_context(session->ctx); |
b5234c06 | 249 | free(session); |
8020ceb5 MD |
250 | } |
251 | ||
53569322 MD |
252 | static |
253 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
254 | struct lttng_session *session) | |
255 | { | |
256 | const char *enum_name = desc->name; | |
257 | struct lttng_enum *_enum; | |
258 | struct cds_hlist_head *head; | |
53569322 MD |
259 | int ret = 0; |
260 | size_t name_len = strlen(enum_name); | |
261 | uint32_t hash; | |
262 | int notify_socket; | |
263 | ||
b33b46f7 | 264 | /* Check if this enum is already registered for this session. */ |
53569322 MD |
265 | hash = jhash(enum_name, name_len, 0); |
266 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
b33b46f7 FD |
267 | |
268 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
269 | if (_enum) { | |
270 | ret = -EEXIST; | |
271 | goto exist; | |
53569322 MD |
272 | } |
273 | ||
274 | notify_socket = lttng_get_notify_socket(session->owner); | |
275 | if (notify_socket < 0) { | |
276 | ret = notify_socket; | |
277 | goto socket_error; | |
278 | } | |
279 | ||
280 | _enum = zmalloc(sizeof(*_enum)); | |
281 | if (!_enum) { | |
282 | ret = -ENOMEM; | |
283 | goto cache_error; | |
284 | } | |
285 | _enum->session = session; | |
286 | _enum->desc = desc; | |
287 | ||
288 | ret = ustcomm_register_enum(notify_socket, | |
289 | session->objd, | |
290 | enum_name, | |
291 | desc->nr_entries, | |
292 | desc->entries, | |
293 | &_enum->id); | |
294 | if (ret < 0) { | |
295 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
296 | goto sessiond_register_error; | |
297 | } | |
298 | cds_list_add(&_enum->node, &session->enums_head); | |
299 | cds_hlist_add_head(&_enum->hlist, head); | |
300 | return 0; | |
301 | ||
302 | sessiond_register_error: | |
303 | free(_enum); | |
304 | cache_error: | |
305 | socket_error: | |
306 | exist: | |
307 | return ret; | |
308 | } | |
309 | ||
310 | static | |
311 | int lttng_create_enum_check(const struct lttng_type *type, | |
312 | struct lttng_session *session) | |
313 | { | |
314 | switch (type->atype) { | |
315 | case atype_enum: | |
316 | { | |
317 | const struct lttng_enum_desc *enum_desc; | |
318 | int ret; | |
319 | ||
218deb69 MD |
320 | enum_desc = type->u.legacy.basic.enumeration.desc; |
321 | ret = lttng_enum_create(enum_desc, session); | |
322 | if (ret && ret != -EEXIST) { | |
323 | DBG("Unable to create enum error: (%d)", ret); | |
324 | return ret; | |
325 | } | |
326 | break; | |
327 | } | |
328 | case atype_enum_nestable: | |
329 | { | |
330 | const struct lttng_enum_desc *enum_desc; | |
331 | int ret; | |
332 | ||
333 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
334 | ret = lttng_enum_create(enum_desc, session); |
335 | if (ret && ret != -EEXIST) { | |
336 | DBG("Unable to create enum error: (%d)", ret); | |
337 | return ret; | |
338 | } | |
339 | break; | |
340 | } | |
341 | case atype_dynamic: | |
342 | { | |
343 | const struct lttng_event_field *tag_field_generic; | |
344 | const struct lttng_enum_desc *enum_desc; | |
345 | int ret; | |
346 | ||
347 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 348 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
349 | ret = lttng_enum_create(enum_desc, session); |
350 | if (ret && ret != -EEXIST) { | |
351 | DBG("Unable to create enum error: (%d)", ret); | |
352 | return ret; | |
353 | } | |
354 | break; | |
355 | } | |
356 | default: | |
357 | /* TODO: nested types when they become supported. */ | |
358 | break; | |
359 | } | |
360 | return 0; | |
361 | } | |
362 | ||
363 | static | |
364 | int lttng_create_all_event_enums(size_t nr_fields, | |
365 | const struct lttng_event_field *event_fields, | |
366 | struct lttng_session *session) | |
367 | { | |
368 | size_t i; | |
369 | int ret; | |
370 | ||
371 | /* For each field, ensure enum is part of the session. */ | |
372 | for (i = 0; i < nr_fields; i++) { | |
373 | const struct lttng_type *type = &event_fields[i].type; | |
374 | ||
375 | ret = lttng_create_enum_check(type, session); | |
376 | if (ret) | |
377 | return ret; | |
378 | } | |
379 | return 0; | |
380 | } | |
381 | ||
382 | static | |
383 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
384 | const struct lttng_ctx_field *ctx_fields, | |
385 | struct lttng_session *session) | |
386 | { | |
387 | size_t i; | |
388 | int ret; | |
389 | ||
390 | /* For each field, ensure enum is part of the session. */ | |
391 | for (i = 0; i < nr_fields; i++) { | |
392 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
393 | ||
394 | ret = lttng_create_enum_check(type, session); | |
395 | if (ret) | |
396 | return ret; | |
397 | } | |
398 | return 0; | |
399 | } | |
400 | ||
710b8ee3 MD |
401 | /* |
402 | * Ensure that a state-dump will be performed for this session at the end | |
403 | * of the current handle_message(). | |
404 | */ | |
405 | int lttng_session_statedump(struct lttng_session *session) | |
406 | { | |
407 | session->statedump_pending = 1; | |
408 | lttng_ust_sockinfo_session_enabled(session->owner); | |
409 | return 0; | |
410 | } | |
53569322 | 411 | |
7dd08bec | 412 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
413 | { |
414 | int ret = 0; | |
7dd08bec | 415 | struct lttng_channel *chan; |
32ce8569 | 416 | int notify_socket; |
8020ceb5 | 417 | |
8020ceb5 MD |
418 | if (session->active) { |
419 | ret = -EBUSY; | |
420 | goto end; | |
421 | } | |
422 | ||
32ce8569 MD |
423 | notify_socket = lttng_get_notify_socket(session->owner); |
424 | if (notify_socket < 0) | |
425 | return notify_socket; | |
426 | ||
ac6b4ac6 MD |
427 | /* Set transient enabler state to "enabled" */ |
428 | session->tstate = 1; | |
e58095ef | 429 | |
3ff7660f MD |
430 | /* We need to sync enablers with session before activation. */ |
431 | lttng_session_sync_enablers(session); | |
432 | ||
8020ceb5 MD |
433 | /* |
434 | * Snapshot the number of events per channel to know the type of header | |
435 | * we need to use. | |
436 | */ | |
e58095ef | 437 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 438 | const struct lttng_ctx *ctx; |
83e43212 | 439 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 440 | size_t nr_fields = 0; |
6ca18e66 | 441 | uint32_t chan_id; |
32ce8569 MD |
442 | |
443 | /* don't change it if session stop/restart */ | |
8020ceb5 | 444 | if (chan->header_type) |
32ce8569 MD |
445 | continue; |
446 | ctx = chan->ctx; | |
447 | if (ctx) { | |
448 | nr_fields = ctx->nr_fields; | |
83e43212 | 449 | fields = ctx->fields; |
53569322 MD |
450 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
451 | session); | |
452 | if (ret < 0) { | |
453 | DBG("Error (%d) adding enum to session", ret); | |
454 | return ret; | |
455 | } | |
32ce8569 MD |
456 | } |
457 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 458 | session, |
32ce8569 MD |
459 | session->objd, |
460 | chan->objd, | |
461 | nr_fields, | |
462 | fields, | |
6ca18e66 | 463 | &chan_id, |
32ce8569 | 464 | &chan->header_type); |
b869b5ae MD |
465 | if (ret) { |
466 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 467 | return ret; |
b869b5ae | 468 | } |
6ca18e66 MD |
469 | if (chan_id != chan->id) { |
470 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
471 | chan_id, chan->id); | |
472 | return -EINVAL; | |
473 | } | |
8020ceb5 MD |
474 | } |
475 | ||
ac6b4ac6 | 476 | /* Set atomically the state to "active" */ |
b5234c06 MD |
477 | CMM_ACCESS_ONCE(session->active) = 1; |
478 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 479 | |
710b8ee3 MD |
480 | ret = lttng_session_statedump(session); |
481 | if (ret) | |
482 | return ret; | |
8020ceb5 | 483 | end: |
8020ceb5 MD |
484 | return ret; |
485 | } | |
486 | ||
7dd08bec | 487 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
488 | { |
489 | int ret = 0; | |
490 | ||
8020ceb5 MD |
491 | if (!session->active) { |
492 | ret = -EBUSY; | |
493 | goto end; | |
494 | } | |
ac6b4ac6 | 495 | /* Set atomically the state to "inactive" */ |
b5234c06 | 496 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
497 | |
498 | /* Set transient enabler state to "disabled" */ | |
499 | session->tstate = 0; | |
500 | lttng_session_sync_enablers(session); | |
8020ceb5 | 501 | end: |
8020ceb5 MD |
502 | return ret; |
503 | } | |
504 | ||
7dd08bec | 505 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 506 | { |
ac6b4ac6 | 507 | int ret = 0; |
976fe9ea | 508 | |
ac6b4ac6 MD |
509 | if (channel->enabled) { |
510 | ret = -EBUSY; | |
511 | goto end; | |
512 | } | |
513 | /* Set transient enabler state to "enabled" */ | |
514 | channel->tstate = 1; | |
515 | lttng_session_sync_enablers(channel->session); | |
516 | /* Set atomically the state to "enabled" */ | |
517 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
518 | end: | |
519 | return ret; | |
976fe9ea MD |
520 | } |
521 | ||
7dd08bec | 522 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 523 | { |
ac6b4ac6 | 524 | int ret = 0; |
976fe9ea | 525 | |
ac6b4ac6 MD |
526 | if (!channel->enabled) { |
527 | ret = -EBUSY; | |
528 | goto end; | |
529 | } | |
530 | /* Set atomically the state to "disabled" */ | |
531 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
532 | /* Set transient enabler state to "enabled" */ | |
533 | channel->tstate = 0; | |
534 | lttng_session_sync_enablers(channel->session); | |
535 | end: | |
536 | return ret; | |
976fe9ea MD |
537 | } |
538 | ||
8020ceb5 MD |
539 | /* |
540 | * Supports event creation while tracing session is active. | |
541 | */ | |
e58095ef MD |
542 | static |
543 | int lttng_event_create(const struct lttng_event_desc *desc, | |
544 | struct lttng_channel *chan) | |
8020ceb5 | 545 | { |
e58095ef | 546 | const char *event_name = desc->name; |
7dd08bec | 547 | struct lttng_event *event; |
32ce8569 | 548 | struct lttng_session *session = chan->session; |
d56fa719 | 549 | struct cds_hlist_head *head; |
576599a0 | 550 | int ret = 0; |
d56fa719 MD |
551 | size_t name_len = strlen(event_name); |
552 | uint32_t hash; | |
32ce8569 MD |
553 | int notify_socket, loglevel; |
554 | const char *uri; | |
8020ceb5 | 555 | |
d56fa719 MD |
556 | hash = jhash(event_name, name_len, 0); |
557 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
457a6b58 | 558 | |
32ce8569 MD |
559 | notify_socket = lttng_get_notify_socket(session->owner); |
560 | if (notify_socket < 0) { | |
561 | ret = notify_socket; | |
562 | goto socket_error; | |
563 | } | |
564 | ||
53569322 MD |
565 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
566 | session); | |
c785c634 MD |
567 | if (ret < 0) { |
568 | DBG("Error (%d) adding enum to session", ret); | |
569 | goto create_enum_error; | |
570 | } | |
571 | ||
457a6b58 MD |
572 | /* |
573 | * Check if loglevel match. Refuse to connect event if not. | |
574 | */ | |
7dd08bec | 575 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
576 | if (!event) { |
577 | ret = -ENOMEM; | |
8020ceb5 | 578 | goto cache_error; |
576599a0 | 579 | } |
8020ceb5 | 580 | event->chan = chan; |
e58095ef | 581 | |
ac6b4ac6 MD |
582 | /* Event will be enabled by enabler sync. */ |
583 | event->enabled = 0; | |
584 | event->registered = 0; | |
e58095ef MD |
585 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
586 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
587 | event->desc = desc; | |
32ce8569 MD |
588 | |
589 | if (desc->loglevel) | |
590 | loglevel = *(*event->desc->loglevel); | |
591 | else | |
592 | loglevel = TRACE_DEFAULT; | |
593 | if (desc->u.ext.model_emf_uri) | |
594 | uri = *(desc->u.ext.model_emf_uri); | |
595 | else | |
596 | uri = NULL; | |
597 | ||
13b21cd6 MD |
598 | /* Fetch event ID from sessiond */ |
599 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 600 | session, |
13b21cd6 MD |
601 | session->objd, |
602 | chan->objd, | |
603 | event_name, | |
604 | loglevel, | |
605 | desc->signature, | |
606 | desc->nr_fields, | |
607 | desc->fields, | |
608 | uri, | |
609 | &event->id); | |
610 | if (ret < 0) { | |
611 | DBG("Error (%d) registering event to sessiond", ret); | |
612 | goto sessiond_register_error; | |
32ce8569 | 613 | } |
2b213b16 | 614 | |
e58095ef | 615 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 616 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 617 | return 0; |
8020ceb5 | 618 | |
32ce8569 | 619 | sessiond_register_error: |
b5234c06 | 620 | free(event); |
8020ceb5 | 621 | cache_error: |
c785c634 | 622 | create_enum_error: |
32ce8569 | 623 | socket_error: |
576599a0 | 624 | return ret; |
8020ceb5 MD |
625 | } |
626 | ||
e58095ef | 627 | static |
196ec2df | 628 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
629 | struct lttng_enabler *enabler) |
630 | { | |
631 | int loglevel = 0; | |
7e2e405c | 632 | unsigned int has_loglevel = 0; |
e58095ef | 633 | |
196ec2df | 634 | assert(enabler->type == LTTNG_ENABLER_STAR_GLOB); |
1f6f42e6 MD |
635 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
636 | desc->name, SIZE_MAX)) | |
e58095ef MD |
637 | return 0; |
638 | if (desc->loglevel) { | |
639 | loglevel = *(*desc->loglevel); | |
640 | has_loglevel = 1; | |
641 | } | |
642 | if (!lttng_loglevel_match(loglevel, | |
643 | has_loglevel, | |
644 | enabler->event_param.loglevel_type, | |
645 | enabler->event_param.loglevel)) | |
646 | return 0; | |
647 | return 1; | |
648 | } | |
649 | ||
650 | static | |
651 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
652 | struct lttng_enabler *enabler) | |
653 | { | |
654 | int loglevel = 0; | |
655 | unsigned int has_loglevel = 0; | |
656 | ||
657 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
658 | if (strcmp(desc->name, enabler->event_param.name)) | |
659 | return 0; | |
660 | if (desc->loglevel) { | |
661 | loglevel = *(*desc->loglevel); | |
662 | has_loglevel = 1; | |
663 | } | |
664 | if (!lttng_loglevel_match(loglevel, | |
665 | has_loglevel, | |
666 | enabler->event_param.loglevel_type, | |
667 | enabler->event_param.loglevel)) | |
668 | return 0; | |
669 | return 1; | |
670 | } | |
671 | ||
672 | static | |
673 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
674 | struct lttng_enabler *enabler) | |
675 | { | |
196ec2df PP |
676 | switch (enabler->type) { |
677 | case LTTNG_ENABLER_STAR_GLOB: | |
678 | { | |
679 | struct lttng_ust_excluder_node *excluder; | |
680 | ||
681 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
682 | return 0; | |
683 | } | |
684 | ||
685 | /* | |
686 | * If the matching event matches with an excluder, | |
687 | * return 'does not match' | |
688 | */ | |
689 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
690 | int count; | |
691 | ||
692 | for (count = 0; count < excluder->excluder.count; count++) { | |
693 | int len; | |
694 | char *excluder_name; | |
695 | ||
696 | excluder_name = (char *) (excluder->excluder.names) | |
697 | + count * LTTNG_UST_SYM_NAME_LEN; | |
698 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 699 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 700 | return 0; |
ed5b5bbd JI |
701 | } |
702 | } | |
196ec2df | 703 | return 1; |
ed5b5bbd | 704 | } |
e58095ef MD |
705 | case LTTNG_ENABLER_EVENT: |
706 | return lttng_desc_match_event_enabler(desc, enabler); | |
707 | default: | |
708 | return -EINVAL; | |
709 | } | |
710 | } | |
711 | ||
712 | static | |
713 | int lttng_event_match_enabler(struct lttng_event *event, | |
714 | struct lttng_enabler *enabler) | |
715 | { | |
d970f72e MD |
716 | if (lttng_desc_match_enabler(event->desc, enabler) |
717 | && event->chan == enabler->chan) | |
718 | return 1; | |
719 | else | |
720 | return 0; | |
e58095ef MD |
721 | } |
722 | ||
723 | static | |
724 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
725 | struct lttng_enabler *enabler) | |
726 | { | |
727 | struct lttng_enabler_ref *enabler_ref; | |
728 | ||
729 | cds_list_for_each_entry(enabler_ref, | |
730 | &event->enablers_ref_head, node) { | |
731 | if (enabler_ref->ref == enabler) | |
732 | return enabler_ref; | |
733 | } | |
734 | return NULL; | |
735 | } | |
736 | ||
8020ceb5 | 737 | /* |
e58095ef MD |
738 | * Create struct lttng_event if it is missing and present in the list of |
739 | * tracepoint probes. | |
8020ceb5 | 740 | */ |
e58095ef MD |
741 | static |
742 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 743 | { |
e58095ef MD |
744 | struct lttng_session *session = enabler->chan->session; |
745 | struct lttng_probe_desc *probe_desc; | |
746 | const struct lttng_event_desc *desc; | |
747 | struct lttng_event *event; | |
748 | int i; | |
749 | struct cds_list_head *probe_list; | |
750 | ||
751 | probe_list = lttng_get_probe_list_head(); | |
752 | /* | |
753 | * For each probe event, if we find that a probe event matches | |
754 | * our enabler, create an associated lttng_event if not | |
755 | * already present. | |
756 | */ | |
757 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
758 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
759 | int ret; |
760 | bool found = false; | |
d56fa719 MD |
761 | struct cds_hlist_head *head; |
762 | struct cds_hlist_node *node; | |
763 | const char *event_name; | |
764 | size_t name_len; | |
765 | uint32_t hash; | |
e58095ef MD |
766 | |
767 | desc = probe_desc->event_desc[i]; | |
768 | if (!lttng_desc_match_enabler(desc, enabler)) | |
769 | continue; | |
d56fa719 MD |
770 | event_name = desc->name; |
771 | name_len = strlen(event_name); | |
e58095ef MD |
772 | |
773 | /* | |
d56fa719 | 774 | * Check if already created. |
e58095ef | 775 | */ |
d56fa719 MD |
776 | hash = jhash(event_name, name_len, 0); |
777 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
778 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
d970f72e | 779 | if (event->desc == desc |
3140bffe | 780 | && event->chan == enabler->chan) { |
98a97f24 | 781 | found = true; |
3140bffe FD |
782 | break; |
783 | } | |
e58095ef MD |
784 | } |
785 | if (found) | |
786 | continue; | |
787 | ||
788 | /* | |
789 | * We need to create an event for this | |
790 | * event probe. | |
791 | */ | |
792 | ret = lttng_event_create(probe_desc->event_desc[i], | |
793 | enabler->chan); | |
794 | if (ret) { | |
32ce8569 MD |
795 | DBG("Unable to create event %s, error %d\n", |
796 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 797 | } |
8165c8da | 798 | } |
8020ceb5 | 799 | } |
8020ceb5 MD |
800 | } |
801 | ||
35ac38cb FD |
802 | /* |
803 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
804 | * the probe provider descriptor received as argument. Must me called with the | |
805 | * ust_lock held. | |
806 | */ | |
807 | void lttng_probe_provider_unregister_events(struct lttng_probe_desc *provider_desc) | |
808 | { | |
809 | struct cds_hlist_node *node, *tmp_node; | |
810 | struct cds_list_head *sessionsp; | |
811 | struct lttng_session *session; | |
812 | struct cds_hlist_head *head; | |
813 | struct lttng_event *event; | |
2c05c691 | 814 | unsigned int i, j; |
35ac38cb FD |
815 | |
816 | /* Get handle on list of sessions. */ | |
817 | sessionsp = _lttng_get_sessions(); | |
818 | ||
819 | /* | |
820 | * Iterate over all events in the probe provider descriptions and sessions | |
821 | * to queue the unregistration of the events. | |
822 | */ | |
823 | for (i = 0; i < provider_desc->nr_events; i++) { | |
824 | const struct lttng_event_desc *event_desc; | |
825 | const char *event_name; | |
826 | size_t name_len; | |
827 | uint32_t hash; | |
828 | ||
829 | event_desc = provider_desc->event_desc[i]; | |
830 | event_name = event_desc->name; | |
831 | name_len = strlen(event_name); | |
832 | hash = jhash(event_name, name_len, 0); | |
833 | ||
834 | /* Iterate over all session to find the current event description. */ | |
835 | cds_list_for_each_entry(session, sessionsp, node) { | |
836 | /* | |
837 | * Get the list of events in the hashtable bucket and iterate to | |
838 | * find the event matching this descriptor. | |
839 | */ | |
840 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
841 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
842 | if (event_desc == event->desc) { | |
843 | /* Queue the unregistration of this event. */ | |
844 | _lttng_event_unregister(event); | |
845 | break; | |
846 | } | |
847 | } | |
848 | } | |
849 | } | |
850 | ||
851 | /* Wait for grace period. */ | |
852 | synchronize_trace(); | |
853 | /* Prune the unregistration queue. */ | |
854 | __tracepoint_probe_prune_release_queue(); | |
855 | ||
856 | /* | |
857 | * It is now safe to destroy the events and remove them from the event list | |
858 | * and hashtables. | |
859 | */ | |
860 | for (i = 0; i < provider_desc->nr_events; i++) { | |
861 | const struct lttng_event_desc *event_desc; | |
862 | const char *event_name; | |
863 | size_t name_len; | |
864 | uint32_t hash; | |
865 | ||
866 | event_desc = provider_desc->event_desc[i]; | |
867 | event_name = event_desc->name; | |
868 | name_len = strlen(event_name); | |
869 | hash = jhash(event_name, name_len, 0); | |
870 | ||
871 | /* Iterate over all sessions to find the current event description. */ | |
872 | cds_list_for_each_entry(session, sessionsp, node) { | |
873 | /* | |
874 | * Get the list of events in the hashtable bucket and iterate to | |
875 | * find the event matching this descriptor. | |
876 | */ | |
877 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
878 | cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) { | |
879 | if (event_desc == event->desc) { | |
880 | /* Destroy enums of the current event. */ | |
881 | for (j = 0; j < event->desc->nr_fields; j++) { | |
882 | const struct lttng_enum_desc *enum_desc; | |
883 | const struct lttng_event_field *field; | |
884 | struct lttng_enum *curr_enum; | |
885 | ||
886 | field = &(event->desc->fields[j]); | |
218deb69 MD |
887 | switch (field->type.atype) { |
888 | case atype_enum: | |
889 | enum_desc = field->type.u.legacy.basic.enumeration.desc; | |
890 | break; | |
891 | case atype_enum_nestable: | |
892 | enum_desc = field->type.u.enum_nestable.desc; | |
893 | break; | |
894 | default: | |
35ac38cb FD |
895 | continue; |
896 | } | |
35ac38cb FD |
897 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); |
898 | if (curr_enum) { | |
899 | _lttng_enum_destroy(curr_enum); | |
900 | } | |
901 | } | |
902 | ||
903 | /* Destroy event. */ | |
904 | _lttng_event_destroy(event); | |
905 | break; | |
906 | } | |
907 | } | |
908 | } | |
909 | } | |
910 | } | |
911 | ||
8020ceb5 | 912 | /* |
e58095ef MD |
913 | * Create events associated with an enabler (if not already present), |
914 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
915 | */ |
916 | static | |
e58095ef | 917 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 918 | { |
e58095ef MD |
919 | struct lttng_session *session = enabler->chan->session; |
920 | struct lttng_event *event; | |
921 | ||
de713d8a FD |
922 | if (!enabler->enabled) |
923 | goto end; | |
924 | ||
e58095ef MD |
925 | /* First ensure that probe events are created for this enabler. */ |
926 | lttng_create_event_if_missing(enabler); | |
927 | ||
928 | /* For each event matching enabler in session event list. */ | |
929 | cds_list_for_each_entry(event, &session->events_head, node) { | |
930 | struct lttng_enabler_ref *enabler_ref; | |
931 | ||
932 | if (!lttng_event_match_enabler(event, enabler)) | |
933 | continue; | |
934 | ||
935 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
936 | if (!enabler_ref) { | |
937 | /* | |
938 | * If no backward ref, create it. | |
939 | * Add backward ref from event to enabler. | |
940 | */ | |
941 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
942 | if (!enabler_ref) | |
943 | return -ENOMEM; | |
944 | enabler_ref->ref = enabler; | |
945 | cds_list_add(&enabler_ref->node, | |
946 | &event->enablers_ref_head); | |
8165c8da | 947 | } |
e58095ef MD |
948 | |
949 | /* | |
950 | * Link filter bytecodes if not linked yet. | |
951 | */ | |
952 | lttng_enabler_event_link_bytecode(event, enabler); | |
953 | ||
954 | /* TODO: merge event context. */ | |
955 | } | |
de713d8a | 956 | end: |
e58095ef MD |
957 | return 0; |
958 | } | |
959 | ||
960 | /* | |
961 | * Called at library load: connect the probe on all enablers matching | |
962 | * this event. | |
5f733922 | 963 | * Called with session mutex held. |
e58095ef | 964 | */ |
5f733922 | 965 | int lttng_fix_pending_events(void) |
e58095ef MD |
966 | { |
967 | struct lttng_session *session; | |
968 | ||
969 | cds_list_for_each_entry(session, &sessions, node) { | |
970 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 971 | } |
e58095ef MD |
972 | return 0; |
973 | } | |
974 | ||
246be17e | 975 | /* |
37dddb65 MD |
976 | * For each session of the owner thread, execute pending statedump. |
977 | * Only dump state for the sessions owned by the caller thread, because | |
978 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 979 | */ |
3327ac33 | 980 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
981 | { |
982 | struct lttng_session *session; | |
983 | ||
37dddb65 | 984 | /* Execute state dump */ |
cf73e0fe | 985 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
986 | |
987 | /* Clear pending state dump */ | |
3327ac33 MD |
988 | if (ust_lock()) { |
989 | goto end; | |
990 | } | |
246be17e | 991 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
992 | if (session->owner != owner) |
993 | continue; | |
994 | if (!session->statedump_pending) | |
995 | continue; | |
996 | session->statedump_pending = 0; | |
246be17e | 997 | } |
3327ac33 | 998 | end: |
37dddb65 | 999 | ust_unlock(); |
3327ac33 | 1000 | return; |
246be17e PW |
1001 | } |
1002 | ||
e58095ef MD |
1003 | /* |
1004 | * Only used internally at session destruction. | |
1005 | */ | |
1006 | static | |
1007 | void _lttng_event_destroy(struct lttng_event *event) | |
1008 | { | |
1009 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1010 | ||
35ac38cb | 1011 | /* Remove from event list. */ |
e58095ef | 1012 | cds_list_del(&event->node); |
35ac38cb FD |
1013 | /* Remove from event hash table. */ |
1014 | cds_hlist_del(&event->hlist); | |
1015 | ||
8020ceb5 | 1016 | lttng_destroy_context(event->ctx); |
f488575f | 1017 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1018 | /* Free event enabler refs */ |
1019 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1020 | &event->enablers_ref_head, node) | |
1021 | free(enabler_ref); | |
b5234c06 | 1022 | free(event); |
8020ceb5 MD |
1023 | } |
1024 | ||
c785c634 MD |
1025 | static |
1026 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1027 | { | |
1028 | cds_list_del(&_enum->node); | |
35ac38cb | 1029 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1030 | free(_enum); |
1031 | } | |
1032 | ||
003fedf4 | 1033 | void lttng_ust_events_exit(void) |
8020ceb5 | 1034 | { |
7dd08bec | 1035 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1036 | |
e58095ef | 1037 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1038 | lttng_session_destroy(session); |
8020ceb5 | 1039 | } |
457a6b58 | 1040 | |
e58095ef MD |
1041 | /* |
1042 | * Enabler management. | |
1043 | */ | |
1044 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1045 | struct lttng_ust_event *event_param, | |
1046 | struct lttng_channel *chan) | |
457a6b58 | 1047 | { |
e58095ef MD |
1048 | struct lttng_enabler *enabler; |
1049 | ||
1050 | enabler = zmalloc(sizeof(*enabler)); | |
1051 | if (!enabler) | |
1052 | return NULL; | |
1053 | enabler->type = type; | |
1054 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
0f63324a | 1055 | CDS_INIT_LIST_HEAD(&enabler->excluder_head); |
e58095ef MD |
1056 | memcpy(&enabler->event_param, event_param, |
1057 | sizeof(enabler->event_param)); | |
1058 | enabler->chan = chan; | |
1059 | /* ctx left NULL */ | |
89f26d57 | 1060 | enabler->enabled = 0; |
e58095ef MD |
1061 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); |
1062 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1063 | return enabler; | |
457a6b58 MD |
1064 | } |
1065 | ||
e58095ef | 1066 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 1067 | { |
e58095ef MD |
1068 | enabler->enabled = 1; |
1069 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1070 | return 0; | |
457a6b58 | 1071 | } |
457a6b58 | 1072 | |
e58095ef | 1073 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 1074 | { |
e58095ef MD |
1075 | enabler->enabled = 0; |
1076 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1077 | return 0; | |
1078 | } | |
457a6b58 | 1079 | |
e58095ef MD |
1080 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1081 | struct lttng_ust_filter_bytecode_node *bytecode) | |
1082 | { | |
1083 | bytecode->enabler = enabler; | |
1084 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
1085 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1086 | return 0; | |
0bfb5cbd JI |
1087 | } |
1088 | ||
1089 | int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
1090 | struct lttng_ust_excluder_node *excluder) | |
1091 | { | |
1092 | excluder->enabler = enabler; | |
1093 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
1094 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1095 | return 0; | |
e58095ef | 1096 | } |
f488575f | 1097 | |
e58095ef | 1098 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1099 | union ust_args *uargs, |
e58095ef MD |
1100 | struct lttng_ctx **ctx, struct lttng_session *session) |
1101 | { | |
457a6b58 | 1102 | /* |
e58095ef MD |
1103 | * We cannot attach a context after trace has been started for a |
1104 | * session because the metadata does not allow expressing this | |
1105 | * information outside of the original channel scope. | |
457a6b58 | 1106 | */ |
e58095ef MD |
1107 | if (session->been_active) |
1108 | return -EPERM; | |
457a6b58 | 1109 | |
e58095ef MD |
1110 | switch (context_param->ctx) { |
1111 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1112 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1113 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1114 | { | |
1115 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1116 | ||
1117 | perf_ctx_param = &context_param->u.perf_counter; | |
1118 | return lttng_add_perf_counter_to_ctx( | |
1119 | perf_ctx_param->type, | |
1120 | perf_ctx_param->config, | |
1121 | perf_ctx_param->name, | |
1122 | ctx); | |
1123 | } | |
e58095ef MD |
1124 | case LTTNG_UST_CONTEXT_VTID: |
1125 | return lttng_add_vtid_to_ctx(ctx); | |
1126 | case LTTNG_UST_CONTEXT_VPID: | |
1127 | return lttng_add_vpid_to_ctx(ctx); | |
1128 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1129 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1130 | case LTTNG_UST_CONTEXT_IP: |
1131 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1132 | case LTTNG_UST_CONTEXT_CPU_ID: |
1133 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1134 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1135 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1136 | ctx); | |
735bef47 MJ |
1137 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1138 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1139 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1140 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1141 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1142 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1143 | case LTTNG_UST_CONTEXT_NET_NS: | |
1144 | return lttng_add_net_ns_to_ctx(ctx); | |
1145 | case LTTNG_UST_CONTEXT_PID_NS: | |
1146 | return lttng_add_pid_ns_to_ctx(ctx); | |
cefef7a7 MJ |
1147 | case LTTNG_UST_CONTEXT_TIME_NS: |
1148 | return lttng_add_time_ns_to_ctx(ctx); | |
735bef47 MJ |
1149 | case LTTNG_UST_CONTEXT_USER_NS: |
1150 | return lttng_add_user_ns_to_ctx(ctx); | |
1151 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1152 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1153 | case LTTNG_UST_CONTEXT_VUID: |
1154 | return lttng_add_vuid_to_ctx(ctx); | |
1155 | case LTTNG_UST_CONTEXT_VEUID: | |
1156 | return lttng_add_veuid_to_ctx(ctx); | |
1157 | case LTTNG_UST_CONTEXT_VSUID: | |
1158 | return lttng_add_vsuid_to_ctx(ctx); | |
1159 | case LTTNG_UST_CONTEXT_VGID: | |
1160 | return lttng_add_vgid_to_ctx(ctx); | |
1161 | case LTTNG_UST_CONTEXT_VEGID: | |
1162 | return lttng_add_vegid_to_ctx(ctx); | |
1163 | case LTTNG_UST_CONTEXT_VSGID: | |
1164 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1165 | default: |
1166 | return -EINVAL; | |
457a6b58 | 1167 | } |
457a6b58 MD |
1168 | } |
1169 | ||
e58095ef MD |
1170 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1171 | struct lttng_ust_context *context_param) | |
457a6b58 | 1172 | { |
e58095ef MD |
1173 | #if 0 // disabled for now. |
1174 | struct lttng_session *session = enabler->chan->session; | |
1175 | int ret; | |
457a6b58 | 1176 | |
e58095ef MD |
1177 | ret = lttng_attach_context(context_param, &enabler->ctx, |
1178 | session); | |
1179 | if (ret) | |
1180 | return ret; | |
1181 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1182 | #endif | |
1183 | return -ENOSYS; | |
457a6b58 MD |
1184 | } |
1185 | ||
e58095ef MD |
1186 | static |
1187 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 1188 | { |
e58095ef | 1189 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
0f63324a | 1190 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
457a6b58 | 1191 | |
e58095ef MD |
1192 | /* Destroy filter bytecode */ |
1193 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1194 | &enabler->filter_bytecode_head, node) { | |
1195 | free(filter_node); | |
457a6b58 | 1196 | } |
e58095ef | 1197 | |
0f63324a JI |
1198 | /* Destroy excluders */ |
1199 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
1200 | &enabler->excluder_head, node) { | |
1201 | free(excluder_node); | |
1202 | } | |
1203 | ||
e58095ef MD |
1204 | /* Destroy contexts */ |
1205 | lttng_destroy_context(enabler->ctx); | |
1206 | ||
1207 | cds_list_del(&enabler->node); | |
1208 | free(enabler); | |
457a6b58 MD |
1209 | } |
1210 | ||
e58095ef MD |
1211 | /* |
1212 | * lttng_session_sync_enablers should be called just before starting a | |
1213 | * session. | |
1214 | */ | |
457a6b58 | 1215 | static |
e58095ef | 1216 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 1217 | { |
e58095ef MD |
1218 | struct lttng_enabler *enabler; |
1219 | struct lttng_event *event; | |
457a6b58 | 1220 | |
e58095ef MD |
1221 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
1222 | lttng_enabler_ref_events(enabler); | |
1223 | /* | |
1224 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1225 | * and its channel and session transient states are enabled, we |
1226 | * enable the event, else we disable it. | |
e58095ef MD |
1227 | */ |
1228 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1229 | struct lttng_enabler_ref *enabler_ref; | |
1230 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1231 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1232 | |
1233 | /* Enable events */ | |
1234 | cds_list_for_each_entry(enabler_ref, | |
1235 | &event->enablers_ref_head, node) { | |
1236 | if (enabler_ref->ref->enabled) { | |
1237 | enabled = 1; | |
1238 | break; | |
1239 | } | |
1240 | } | |
ac6b4ac6 MD |
1241 | /* |
1242 | * Enabled state is based on union of enablers, with | |
1243 | * intesection of session and channel transient enable | |
1244 | * states. | |
1245 | */ | |
1246 | enabled = enabled && session->tstate && event->chan->tstate; | |
1247 | ||
1248 | CMM_STORE_SHARED(event->enabled, enabled); | |
1249 | /* | |
1250 | * Sync tracepoint registration with event enabled | |
1251 | * state. | |
1252 | */ | |
1253 | if (enabled) { | |
1254 | if (!event->registered) | |
1255 | register_event(event); | |
1256 | } else { | |
1257 | if (event->registered) | |
1258 | unregister_event(event); | |
1259 | } | |
457a6b58 | 1260 | |
1f49fc05 | 1261 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1262 | cds_list_for_each_entry(enabler_ref, |
1263 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1264 | if (enabler_ref->ref->enabled |
1265 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1266 | has_enablers_without_bytecode = 1; |
1267 | break; | |
1268 | } | |
1269 | } | |
1270 | event->has_enablers_without_bytecode = | |
1271 | has_enablers_without_bytecode; | |
1272 | ||
e58095ef MD |
1273 | /* Enable filters */ |
1274 | cds_list_for_each_entry(runtime, | |
1275 | &event->bytecode_runtime_head, node) { | |
1276 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
1277 | } |
1278 | } | |
baa1e0bc | 1279 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1280 | } |
1281 | ||
e58095ef MD |
1282 | /* |
1283 | * Apply enablers to session events, adding events to session if need | |
1284 | * be. It is required after each modification applied to an active | |
1285 | * session, and right before session "start". | |
1286 | * "lazy" sync means we only sync if required. | |
1287 | */ | |
1288 | static | |
1289 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 1290 | { |
e58095ef MD |
1291 | /* We can skip if session is not active */ |
1292 | if (!session->active) | |
1293 | return; | |
1294 | lttng_session_sync_enablers(session); | |
457a6b58 | 1295 | } |
53569322 MD |
1296 | |
1297 | /* | |
1298 | * Update all sessions with the given app context. | |
1299 | * Called with ust lock held. | |
1300 | * This is invoked when an application context gets loaded/unloaded. It | |
1301 | * ensures the context callbacks are in sync with the application | |
1302 | * context (either app context callbacks, or dummy callbacks). | |
1303 | */ | |
1304 | void lttng_ust_context_set_session_provider(const char *name, | |
1305 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1306 | void (*record)(struct lttng_ctx_field *field, | |
1307 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1308 | struct lttng_channel *chan), | |
1309 | void (*get_value)(struct lttng_ctx_field *field, | |
1310 | struct lttng_ctx_value *value)) | |
1311 | { | |
1312 | struct lttng_session *session; | |
1313 | ||
1314 | cds_list_for_each_entry(session, &sessions, node) { | |
1315 | struct lttng_channel *chan; | |
1316 | struct lttng_event *event; | |
1317 | int ret; | |
1318 | ||
1319 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1320 | name, get_size, record, get_value); | |
1321 | if (ret) | |
1322 | abort(); | |
1323 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1324 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1325 | name, get_size, record, get_value); | |
1326 | if (ret) | |
1327 | abort(); | |
1328 | } | |
1329 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1330 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1331 | name, get_size, record, get_value); | |
1332 | if (ret) | |
1333 | abort(); | |
1334 | } | |
1335 | } | |
1336 | } |