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 | 23 | #define _GNU_SOURCE |
3fbec7dc | 24 | #define _LGPL_SOURCE |
b5234c06 MD |
25 | #include <stdio.h> |
26 | #include <urcu/list.h> | |
8165c8da | 27 | #include <urcu/hlist.h> |
b5234c06 | 28 | #include <pthread.h> |
b5234c06 | 29 | #include <errno.h> |
f4681817 MD |
30 | #include <sys/shm.h> |
31 | #include <sys/ipc.h> | |
44c72f10 MD |
32 | #include <stdint.h> |
33 | #include <stddef.h> | |
28b12049 MD |
34 | #include <inttypes.h> |
35 | #include <time.h> | |
196ec2df | 36 | #include <stdbool.h> |
2ae57758 | 37 | #include <lttng/ust-endian.h> |
28b12049 | 38 | #include "clock.h" |
44c72f10 MD |
39 | |
40 | #include <urcu-bp.h> | |
41 | #include <urcu/compiler.h> | |
42 | #include <urcu/uatomic.h> | |
43 | #include <urcu/arch.h> | |
44 | ||
45 | #include <lttng/tracepoint.h> | |
4318ae1b | 46 | #include <lttng/ust-events.h> |
44c72f10 MD |
47 | |
48 | #include <usterr-signal-safe.h> | |
49 | #include <helper.h> | |
7d3e35b6 | 50 | #include <lttng/ust-ctl.h> |
32ce8569 | 51 | #include <ust-comm.h> |
53569322 MD |
52 | #include <lttng/ust-dynamic-type.h> |
53 | #include <lttng/ust-context-provider.h> | |
1f18504e | 54 | #include "error.h" |
08114193 | 55 | #include "compat.h" |
eda498b8 | 56 | #include "lttng-ust-uuid.h" |
44c72f10 | 57 | |
457a6b58 | 58 | #include "tracepoint-internal.h" |
196ec2df | 59 | #include "string-utils.h" |
7dd08bec MD |
60 | #include "lttng-tracer.h" |
61 | #include "lttng-tracer-core.h" | |
cf73e0fe | 62 | #include "lttng-ust-statedump.h" |
b728d87e | 63 | #include "wait.h" |
8d8a24c8 | 64 | #include "../libringbuffer/shm.h" |
596c4223 | 65 | #include "jhash.h" |
8165c8da MD |
66 | |
67 | /* | |
3327ac33 MD |
68 | * All operations within this file are called by the communication |
69 | * thread, under ust_lock protection. | |
8165c8da | 70 | */ |
8165c8da | 71 | |
b5234c06 | 72 | static CDS_LIST_HEAD(sessions); |
8165c8da | 73 | |
37dddb65 MD |
74 | struct cds_list_head *_lttng_get_sessions(void) |
75 | { | |
76 | return &sessions; | |
77 | } | |
78 | ||
7dd08bec | 79 | static void _lttng_event_destroy(struct lttng_event *event); |
c785c634 | 80 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 81 | |
e58095ef MD |
82 | static |
83 | void lttng_session_lazy_sync_enablers(struct lttng_session *session); | |
84 | static | |
85 | void lttng_session_sync_enablers(struct lttng_session *session); | |
86 | static | |
87 | void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
88 | ||
6715d7d1 MD |
89 | /* |
90 | * Called with ust lock held. | |
91 | */ | |
92 | int lttng_session_active(void) | |
93 | { | |
94 | struct lttng_session *iter; | |
95 | ||
96 | cds_list_for_each_entry(iter, &sessions, node) { | |
97 | if (iter->active) | |
98 | return 1; | |
99 | } | |
100 | return 0; | |
101 | } | |
102 | ||
e58095ef MD |
103 | static |
104 | int lttng_loglevel_match(int loglevel, | |
105 | unsigned int has_loglevel, | |
457a6b58 MD |
106 | enum lttng_ust_loglevel_type req_type, |
107 | int req_loglevel) | |
108 | { | |
e58095ef MD |
109 | if (!has_loglevel) |
110 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
111 | switch (req_type) { |
112 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 113 | if (loglevel <= req_loglevel |
67ada458 | 114 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
115 | return 1; |
116 | else | |
117 | return 0; | |
118 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 119 | if (loglevel == req_loglevel |
67ada458 | 120 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
121 | return 1; |
122 | else | |
123 | return 0; | |
124 | case LTTNG_UST_LOGLEVEL_ALL: | |
125 | default: | |
67ada458 | 126 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
127 | return 1; |
128 | else | |
129 | return 0; | |
457a6b58 MD |
130 | } |
131 | } | |
132 | ||
8020ceb5 MD |
133 | void synchronize_trace(void) |
134 | { | |
8020ceb5 | 135 | synchronize_rcu(); |
8020ceb5 MD |
136 | } |
137 | ||
7dd08bec | 138 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 139 | { |
7dd08bec | 140 | struct lttng_session *session; |
74d81a6c | 141 | int i; |
8020ceb5 | 142 | |
7dd08bec | 143 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
144 | if (!session) |
145 | return NULL; | |
53569322 MD |
146 | if (lttng_session_context_init(&session->ctx)) { |
147 | free(session); | |
148 | return NULL; | |
149 | } | |
e58095ef MD |
150 | CDS_INIT_LIST_HEAD(&session->chan_head); |
151 | CDS_INIT_LIST_HEAD(&session->events_head); | |
c785c634 | 152 | CDS_INIT_LIST_HEAD(&session->enums_head); |
e58095ef | 153 | CDS_INIT_LIST_HEAD(&session->enablers_head); |
d56fa719 MD |
154 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
155 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
c785c634 MD |
156 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
157 | CDS_INIT_HLIST_HEAD(&session->enums_ht.table[i]); | |
e58095ef | 158 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
159 | return session; |
160 | } | |
161 | ||
74d81a6c MD |
162 | /* |
163 | * Only used internally at session destruction. | |
164 | */ | |
165 | static | |
166 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
167 | { | |
168 | struct channel *chan; | |
169 | struct lttng_ust_shm_handle *handle; | |
170 | ||
171 | cds_list_del(<tng_chan->node); | |
172 | lttng_destroy_context(lttng_chan->ctx); | |
173 | chan = lttng_chan->chan; | |
174 | handle = lttng_chan->handle; | |
175 | /* | |
176 | * note: lttng_chan is private data contained within handle. It | |
177 | * will be freed along with the handle. | |
178 | */ | |
179 | channel_destroy(chan, handle, 0); | |
180 | } | |
181 | ||
ac6b4ac6 MD |
182 | static |
183 | void register_event(struct lttng_event *event) | |
184 | { | |
185 | int ret; | |
186 | const struct lttng_event_desc *desc; | |
187 | ||
188 | assert(event->registered == 0); | |
189 | desc = event->desc; | |
baa1e0bc | 190 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
191 | desc->probe_callback, |
192 | event, desc->signature); | |
193 | WARN_ON_ONCE(ret); | |
194 | if (!ret) | |
195 | event->registered = 1; | |
196 | } | |
197 | ||
198 | static | |
199 | void unregister_event(struct lttng_event *event) | |
200 | { | |
201 | int ret; | |
202 | const struct lttng_event_desc *desc; | |
203 | ||
204 | assert(event->registered == 1); | |
205 | desc = event->desc; | |
baa1e0bc | 206 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
207 | desc->probe_callback, |
208 | event); | |
209 | WARN_ON_ONCE(ret); | |
210 | if (!ret) | |
211 | event->registered = 0; | |
212 | } | |
213 | ||
214 | /* | |
215 | * Only used internally at session destruction. | |
216 | */ | |
217 | static | |
218 | void _lttng_event_unregister(struct lttng_event *event) | |
219 | { | |
220 | if (event->registered) | |
221 | unregister_event(event); | |
222 | } | |
223 | ||
7dd08bec | 224 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 225 | { |
7dd08bec MD |
226 | struct lttng_channel *chan, *tmpchan; |
227 | struct lttng_event *event, *tmpevent; | |
c785c634 | 228 | struct lttng_enum *_enum, *tmp_enum; |
e58095ef | 229 | struct lttng_enabler *enabler, *tmpenabler; |
8020ceb5 | 230 | |
b5234c06 | 231 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 232 | cds_list_for_each_entry(event, &session->events_head, node) { |
ac6b4ac6 | 233 | _lttng_event_unregister(event); |
8020ceb5 MD |
234 | } |
235 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
baa1e0bc | 236 | __tracepoint_probe_prune_release_queue(); |
e58095ef MD |
237 | cds_list_for_each_entry_safe(enabler, tmpenabler, |
238 | &session->enablers_head, node) | |
239 | lttng_enabler_destroy(enabler); | |
240 | cds_list_for_each_entry_safe(event, tmpevent, | |
241 | &session->events_head, node) | |
7dd08bec | 242 | _lttng_event_destroy(event); |
c785c634 MD |
243 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
244 | &session->enums_head, node) | |
245 | _lttng_enum_destroy(_enum); | |
e58095ef | 246 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 247 | _lttng_channel_unmap(chan); |
e58095ef | 248 | cds_list_del(&session->node); |
53569322 | 249 | lttng_destroy_context(session->ctx); |
b5234c06 | 250 | free(session); |
8020ceb5 MD |
251 | } |
252 | ||
53569322 MD |
253 | static |
254 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
255 | struct lttng_session *session) | |
256 | { | |
257 | const char *enum_name = desc->name; | |
258 | struct lttng_enum *_enum; | |
259 | struct cds_hlist_head *head; | |
53569322 MD |
260 | int ret = 0; |
261 | size_t name_len = strlen(enum_name); | |
262 | uint32_t hash; | |
263 | int notify_socket; | |
264 | ||
b33b46f7 | 265 | /* Check if this enum is already registered for this session. */ |
53569322 MD |
266 | hash = jhash(enum_name, name_len, 0); |
267 | head = &session->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; | |
b33b46f7 FD |
268 | |
269 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
270 | if (_enum) { | |
271 | ret = -EEXIST; | |
272 | goto exist; | |
53569322 MD |
273 | } |
274 | ||
275 | notify_socket = lttng_get_notify_socket(session->owner); | |
276 | if (notify_socket < 0) { | |
277 | ret = notify_socket; | |
278 | goto socket_error; | |
279 | } | |
280 | ||
281 | _enum = zmalloc(sizeof(*_enum)); | |
282 | if (!_enum) { | |
283 | ret = -ENOMEM; | |
284 | goto cache_error; | |
285 | } | |
286 | _enum->session = session; | |
287 | _enum->desc = desc; | |
288 | ||
289 | ret = ustcomm_register_enum(notify_socket, | |
290 | session->objd, | |
291 | enum_name, | |
292 | desc->nr_entries, | |
293 | desc->entries, | |
294 | &_enum->id); | |
295 | if (ret < 0) { | |
296 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
297 | goto sessiond_register_error; | |
298 | } | |
299 | cds_list_add(&_enum->node, &session->enums_head); | |
300 | cds_hlist_add_head(&_enum->hlist, head); | |
301 | return 0; | |
302 | ||
303 | sessiond_register_error: | |
304 | free(_enum); | |
305 | cache_error: | |
306 | socket_error: | |
307 | exist: | |
308 | return ret; | |
309 | } | |
310 | ||
311 | static | |
312 | int lttng_create_enum_check(const struct lttng_type *type, | |
313 | struct lttng_session *session) | |
314 | { | |
315 | switch (type->atype) { | |
316 | case atype_enum: | |
317 | { | |
318 | const struct lttng_enum_desc *enum_desc; | |
319 | int ret; | |
320 | ||
218deb69 MD |
321 | enum_desc = type->u.legacy.basic.enumeration.desc; |
322 | ret = lttng_enum_create(enum_desc, session); | |
323 | if (ret && ret != -EEXIST) { | |
324 | DBG("Unable to create enum error: (%d)", ret); | |
325 | return ret; | |
326 | } | |
327 | break; | |
328 | } | |
329 | case atype_enum_nestable: | |
330 | { | |
331 | const struct lttng_enum_desc *enum_desc; | |
332 | int ret; | |
333 | ||
334 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
335 | ret = lttng_enum_create(enum_desc, session); |
336 | if (ret && ret != -EEXIST) { | |
337 | DBG("Unable to create enum error: (%d)", ret); | |
338 | return ret; | |
339 | } | |
340 | break; | |
341 | } | |
342 | case atype_dynamic: | |
343 | { | |
344 | const struct lttng_event_field *tag_field_generic; | |
345 | const struct lttng_enum_desc *enum_desc; | |
346 | int ret; | |
347 | ||
348 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 349 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
350 | ret = lttng_enum_create(enum_desc, session); |
351 | if (ret && ret != -EEXIST) { | |
352 | DBG("Unable to create enum error: (%d)", ret); | |
353 | return ret; | |
354 | } | |
355 | break; | |
356 | } | |
357 | default: | |
358 | /* TODO: nested types when they become supported. */ | |
359 | break; | |
360 | } | |
361 | return 0; | |
362 | } | |
363 | ||
364 | static | |
365 | int lttng_create_all_event_enums(size_t nr_fields, | |
366 | const struct lttng_event_field *event_fields, | |
367 | struct lttng_session *session) | |
368 | { | |
369 | size_t i; | |
370 | int ret; | |
371 | ||
372 | /* For each field, ensure enum is part of the session. */ | |
373 | for (i = 0; i < nr_fields; i++) { | |
374 | const struct lttng_type *type = &event_fields[i].type; | |
375 | ||
376 | ret = lttng_create_enum_check(type, session); | |
377 | if (ret) | |
378 | return ret; | |
379 | } | |
380 | return 0; | |
381 | } | |
382 | ||
383 | static | |
384 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
385 | const struct lttng_ctx_field *ctx_fields, | |
386 | struct lttng_session *session) | |
387 | { | |
388 | size_t i; | |
389 | int ret; | |
390 | ||
391 | /* For each field, ensure enum is part of the session. */ | |
392 | for (i = 0; i < nr_fields; i++) { | |
393 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
394 | ||
395 | ret = lttng_create_enum_check(type, session); | |
396 | if (ret) | |
397 | return ret; | |
398 | } | |
399 | return 0; | |
400 | } | |
401 | ||
710b8ee3 MD |
402 | /* |
403 | * Ensure that a state-dump will be performed for this session at the end | |
404 | * of the current handle_message(). | |
405 | */ | |
406 | int lttng_session_statedump(struct lttng_session *session) | |
407 | { | |
408 | session->statedump_pending = 1; | |
409 | lttng_ust_sockinfo_session_enabled(session->owner); | |
410 | return 0; | |
411 | } | |
53569322 | 412 | |
7dd08bec | 413 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
414 | { |
415 | int ret = 0; | |
7dd08bec | 416 | struct lttng_channel *chan; |
32ce8569 | 417 | int notify_socket; |
8020ceb5 | 418 | |
8020ceb5 MD |
419 | if (session->active) { |
420 | ret = -EBUSY; | |
421 | goto end; | |
422 | } | |
423 | ||
32ce8569 MD |
424 | notify_socket = lttng_get_notify_socket(session->owner); |
425 | if (notify_socket < 0) | |
426 | return notify_socket; | |
427 | ||
ac6b4ac6 MD |
428 | /* Set transient enabler state to "enabled" */ |
429 | session->tstate = 1; | |
e58095ef | 430 | |
3ff7660f MD |
431 | /* We need to sync enablers with session before activation. */ |
432 | lttng_session_sync_enablers(session); | |
433 | ||
8020ceb5 MD |
434 | /* |
435 | * Snapshot the number of events per channel to know the type of header | |
436 | * we need to use. | |
437 | */ | |
e58095ef | 438 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 | 439 | const struct lttng_ctx *ctx; |
83e43212 | 440 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 441 | size_t nr_fields = 0; |
6ca18e66 | 442 | uint32_t chan_id; |
32ce8569 MD |
443 | |
444 | /* don't change it if session stop/restart */ | |
8020ceb5 | 445 | if (chan->header_type) |
32ce8569 MD |
446 | continue; |
447 | ctx = chan->ctx; | |
448 | if (ctx) { | |
449 | nr_fields = ctx->nr_fields; | |
83e43212 | 450 | fields = ctx->fields; |
53569322 MD |
451 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
452 | session); | |
453 | if (ret < 0) { | |
454 | DBG("Error (%d) adding enum to session", ret); | |
455 | return ret; | |
456 | } | |
32ce8569 MD |
457 | } |
458 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 459 | session, |
32ce8569 MD |
460 | session->objd, |
461 | chan->objd, | |
462 | nr_fields, | |
463 | fields, | |
6ca18e66 | 464 | &chan_id, |
32ce8569 | 465 | &chan->header_type); |
b869b5ae MD |
466 | if (ret) { |
467 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 468 | return ret; |
b869b5ae | 469 | } |
6ca18e66 MD |
470 | if (chan_id != chan->id) { |
471 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
472 | chan_id, chan->id); | |
473 | return -EINVAL; | |
474 | } | |
8020ceb5 MD |
475 | } |
476 | ||
ac6b4ac6 | 477 | /* Set atomically the state to "active" */ |
b5234c06 MD |
478 | CMM_ACCESS_ONCE(session->active) = 1; |
479 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
95c25348 | 480 | |
710b8ee3 MD |
481 | ret = lttng_session_statedump(session); |
482 | if (ret) | |
483 | return ret; | |
8020ceb5 | 484 | end: |
8020ceb5 MD |
485 | return ret; |
486 | } | |
487 | ||
7dd08bec | 488 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
489 | { |
490 | int ret = 0; | |
491 | ||
8020ceb5 MD |
492 | if (!session->active) { |
493 | ret = -EBUSY; | |
494 | goto end; | |
495 | } | |
ac6b4ac6 | 496 | /* Set atomically the state to "inactive" */ |
b5234c06 | 497 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
498 | |
499 | /* Set transient enabler state to "disabled" */ | |
500 | session->tstate = 0; | |
501 | lttng_session_sync_enablers(session); | |
8020ceb5 | 502 | end: |
8020ceb5 MD |
503 | return ret; |
504 | } | |
505 | ||
7dd08bec | 506 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 507 | { |
ac6b4ac6 | 508 | int ret = 0; |
976fe9ea | 509 | |
ac6b4ac6 MD |
510 | if (channel->enabled) { |
511 | ret = -EBUSY; | |
512 | goto end; | |
513 | } | |
514 | /* Set transient enabler state to "enabled" */ | |
515 | channel->tstate = 1; | |
516 | lttng_session_sync_enablers(channel->session); | |
517 | /* Set atomically the state to "enabled" */ | |
518 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
519 | end: | |
520 | return ret; | |
976fe9ea MD |
521 | } |
522 | ||
7dd08bec | 523 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 524 | { |
ac6b4ac6 | 525 | int ret = 0; |
976fe9ea | 526 | |
ac6b4ac6 MD |
527 | if (!channel->enabled) { |
528 | ret = -EBUSY; | |
529 | goto end; | |
530 | } | |
531 | /* Set atomically the state to "disabled" */ | |
532 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
533 | /* Set transient enabler state to "enabled" */ | |
534 | channel->tstate = 0; | |
535 | lttng_session_sync_enablers(channel->session); | |
536 | end: | |
537 | return ret; | |
976fe9ea MD |
538 | } |
539 | ||
8020ceb5 MD |
540 | /* |
541 | * Supports event creation while tracing session is active. | |
542 | */ | |
e58095ef MD |
543 | static |
544 | int lttng_event_create(const struct lttng_event_desc *desc, | |
545 | struct lttng_channel *chan) | |
8020ceb5 | 546 | { |
e58095ef | 547 | const char *event_name = desc->name; |
7dd08bec | 548 | struct lttng_event *event; |
32ce8569 | 549 | struct lttng_session *session = chan->session; |
d56fa719 | 550 | struct cds_hlist_head *head; |
576599a0 | 551 | int ret = 0; |
d56fa719 MD |
552 | size_t name_len = strlen(event_name); |
553 | uint32_t hash; | |
32ce8569 MD |
554 | int notify_socket, loglevel; |
555 | const char *uri; | |
8020ceb5 | 556 | |
d56fa719 MD |
557 | hash = jhash(event_name, name_len, 0); |
558 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
457a6b58 | 559 | |
32ce8569 MD |
560 | notify_socket = lttng_get_notify_socket(session->owner); |
561 | if (notify_socket < 0) { | |
562 | ret = notify_socket; | |
563 | goto socket_error; | |
564 | } | |
565 | ||
53569322 MD |
566 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
567 | session); | |
c785c634 MD |
568 | if (ret < 0) { |
569 | DBG("Error (%d) adding enum to session", ret); | |
570 | goto create_enum_error; | |
571 | } | |
572 | ||
457a6b58 MD |
573 | /* |
574 | * Check if loglevel match. Refuse to connect event if not. | |
575 | */ | |
7dd08bec | 576 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
577 | if (!event) { |
578 | ret = -ENOMEM; | |
8020ceb5 | 579 | goto cache_error; |
576599a0 | 580 | } |
8020ceb5 | 581 | event->chan = chan; |
e58095ef | 582 | |
ac6b4ac6 MD |
583 | /* Event will be enabled by enabler sync. */ |
584 | event->enabled = 0; | |
585 | event->registered = 0; | |
e58095ef MD |
586 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
587 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
588 | event->desc = desc; | |
32ce8569 MD |
589 | |
590 | if (desc->loglevel) | |
591 | loglevel = *(*event->desc->loglevel); | |
592 | else | |
593 | loglevel = TRACE_DEFAULT; | |
594 | if (desc->u.ext.model_emf_uri) | |
595 | uri = *(desc->u.ext.model_emf_uri); | |
596 | else | |
597 | uri = NULL; | |
598 | ||
13b21cd6 MD |
599 | /* Fetch event ID from sessiond */ |
600 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 601 | session, |
13b21cd6 MD |
602 | session->objd, |
603 | chan->objd, | |
604 | event_name, | |
605 | loglevel, | |
606 | desc->signature, | |
607 | desc->nr_fields, | |
608 | desc->fields, | |
609 | uri, | |
610 | &event->id); | |
611 | if (ret < 0) { | |
612 | DBG("Error (%d) registering event to sessiond", ret); | |
613 | goto sessiond_register_error; | |
32ce8569 | 614 | } |
2b213b16 | 615 | |
e58095ef | 616 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 617 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 618 | return 0; |
8020ceb5 | 619 | |
32ce8569 | 620 | sessiond_register_error: |
b5234c06 | 621 | free(event); |
8020ceb5 | 622 | cache_error: |
c785c634 | 623 | create_enum_error: |
32ce8569 | 624 | socket_error: |
576599a0 | 625 | return ret; |
8020ceb5 MD |
626 | } |
627 | ||
e58095ef | 628 | static |
196ec2df | 629 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
630 | struct lttng_enabler *enabler) |
631 | { | |
632 | int loglevel = 0; | |
7e2e405c | 633 | unsigned int has_loglevel = 0; |
e58095ef | 634 | |
196ec2df | 635 | assert(enabler->type == LTTNG_ENABLER_STAR_GLOB); |
1f6f42e6 MD |
636 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
637 | desc->name, SIZE_MAX)) | |
e58095ef MD |
638 | return 0; |
639 | if (desc->loglevel) { | |
640 | loglevel = *(*desc->loglevel); | |
641 | has_loglevel = 1; | |
642 | } | |
643 | if (!lttng_loglevel_match(loglevel, | |
644 | has_loglevel, | |
645 | enabler->event_param.loglevel_type, | |
646 | enabler->event_param.loglevel)) | |
647 | return 0; | |
648 | return 1; | |
649 | } | |
650 | ||
651 | static | |
652 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
653 | struct lttng_enabler *enabler) | |
654 | { | |
655 | int loglevel = 0; | |
656 | unsigned int has_loglevel = 0; | |
657 | ||
658 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
659 | if (strcmp(desc->name, enabler->event_param.name)) | |
660 | return 0; | |
661 | if (desc->loglevel) { | |
662 | loglevel = *(*desc->loglevel); | |
663 | has_loglevel = 1; | |
664 | } | |
665 | if (!lttng_loglevel_match(loglevel, | |
666 | has_loglevel, | |
667 | enabler->event_param.loglevel_type, | |
668 | enabler->event_param.loglevel)) | |
669 | return 0; | |
670 | return 1; | |
671 | } | |
672 | ||
673 | static | |
674 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
675 | struct lttng_enabler *enabler) | |
676 | { | |
196ec2df PP |
677 | switch (enabler->type) { |
678 | case LTTNG_ENABLER_STAR_GLOB: | |
679 | { | |
680 | struct lttng_ust_excluder_node *excluder; | |
681 | ||
682 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
683 | return 0; | |
684 | } | |
685 | ||
686 | /* | |
687 | * If the matching event matches with an excluder, | |
688 | * return 'does not match' | |
689 | */ | |
690 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
691 | int count; | |
692 | ||
693 | for (count = 0; count < excluder->excluder.count; count++) { | |
694 | int len; | |
695 | char *excluder_name; | |
696 | ||
697 | excluder_name = (char *) (excluder->excluder.names) | |
698 | + count * LTTNG_UST_SYM_NAME_LEN; | |
699 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 700 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 701 | return 0; |
ed5b5bbd JI |
702 | } |
703 | } | |
196ec2df | 704 | return 1; |
ed5b5bbd | 705 | } |
e58095ef MD |
706 | case LTTNG_ENABLER_EVENT: |
707 | return lttng_desc_match_event_enabler(desc, enabler); | |
708 | default: | |
709 | return -EINVAL; | |
710 | } | |
711 | } | |
712 | ||
713 | static | |
714 | int lttng_event_match_enabler(struct lttng_event *event, | |
715 | struct lttng_enabler *enabler) | |
716 | { | |
d970f72e MD |
717 | if (lttng_desc_match_enabler(event->desc, enabler) |
718 | && event->chan == enabler->chan) | |
719 | return 1; | |
720 | else | |
721 | return 0; | |
e58095ef MD |
722 | } |
723 | ||
724 | static | |
725 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
726 | struct lttng_enabler *enabler) | |
727 | { | |
728 | struct lttng_enabler_ref *enabler_ref; | |
729 | ||
730 | cds_list_for_each_entry(enabler_ref, | |
731 | &event->enablers_ref_head, node) { | |
732 | if (enabler_ref->ref == enabler) | |
733 | return enabler_ref; | |
734 | } | |
735 | return NULL; | |
736 | } | |
737 | ||
8020ceb5 | 738 | /* |
e58095ef MD |
739 | * Create struct lttng_event if it is missing and present in the list of |
740 | * tracepoint probes. | |
8020ceb5 | 741 | */ |
e58095ef MD |
742 | static |
743 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 744 | { |
e58095ef MD |
745 | struct lttng_session *session = enabler->chan->session; |
746 | struct lttng_probe_desc *probe_desc; | |
747 | const struct lttng_event_desc *desc; | |
748 | struct lttng_event *event; | |
749 | int i; | |
750 | struct cds_list_head *probe_list; | |
751 | ||
752 | probe_list = lttng_get_probe_list_head(); | |
753 | /* | |
754 | * For each probe event, if we find that a probe event matches | |
755 | * our enabler, create an associated lttng_event if not | |
756 | * already present. | |
757 | */ | |
758 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
759 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
760 | int ret; |
761 | bool found = false; | |
d56fa719 MD |
762 | struct cds_hlist_head *head; |
763 | struct cds_hlist_node *node; | |
764 | const char *event_name; | |
765 | size_t name_len; | |
766 | uint32_t hash; | |
e58095ef MD |
767 | |
768 | desc = probe_desc->event_desc[i]; | |
769 | if (!lttng_desc_match_enabler(desc, enabler)) | |
770 | continue; | |
d56fa719 MD |
771 | event_name = desc->name; |
772 | name_len = strlen(event_name); | |
e58095ef MD |
773 | |
774 | /* | |
d56fa719 | 775 | * Check if already created. |
e58095ef | 776 | */ |
d56fa719 MD |
777 | hash = jhash(event_name, name_len, 0); |
778 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
779 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
d970f72e | 780 | if (event->desc == desc |
3140bffe | 781 | && event->chan == enabler->chan) { |
98a97f24 | 782 | found = true; |
3140bffe FD |
783 | break; |
784 | } | |
e58095ef MD |
785 | } |
786 | if (found) | |
787 | continue; | |
788 | ||
789 | /* | |
790 | * We need to create an event for this | |
791 | * event probe. | |
792 | */ | |
793 | ret = lttng_event_create(probe_desc->event_desc[i], | |
794 | enabler->chan); | |
795 | if (ret) { | |
32ce8569 MD |
796 | DBG("Unable to create event %s, error %d\n", |
797 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 798 | } |
8165c8da | 799 | } |
8020ceb5 | 800 | } |
8020ceb5 MD |
801 | } |
802 | ||
35ac38cb FD |
803 | /* |
804 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
805 | * the probe provider descriptor received as argument. Must me called with the | |
806 | * ust_lock held. | |
807 | */ | |
808 | void lttng_probe_provider_unregister_events(struct lttng_probe_desc *provider_desc) | |
809 | { | |
810 | struct cds_hlist_node *node, *tmp_node; | |
811 | struct cds_list_head *sessionsp; | |
812 | struct lttng_session *session; | |
813 | struct cds_hlist_head *head; | |
814 | struct lttng_event *event; | |
2c05c691 | 815 | unsigned int i, j; |
35ac38cb FD |
816 | |
817 | /* Get handle on list of sessions. */ | |
818 | sessionsp = _lttng_get_sessions(); | |
819 | ||
820 | /* | |
821 | * Iterate over all events in the probe provider descriptions and sessions | |
822 | * to queue the unregistration of the events. | |
823 | */ | |
824 | for (i = 0; i < provider_desc->nr_events; i++) { | |
825 | const struct lttng_event_desc *event_desc; | |
826 | const char *event_name; | |
827 | size_t name_len; | |
828 | uint32_t hash; | |
829 | ||
830 | event_desc = provider_desc->event_desc[i]; | |
831 | event_name = event_desc->name; | |
832 | name_len = strlen(event_name); | |
833 | hash = jhash(event_name, name_len, 0); | |
834 | ||
835 | /* Iterate over all session to find the current event description. */ | |
836 | cds_list_for_each_entry(session, sessionsp, node) { | |
837 | /* | |
838 | * Get the list of events in the hashtable bucket and iterate to | |
839 | * find the event matching this descriptor. | |
840 | */ | |
841 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
842 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
843 | if (event_desc == event->desc) { | |
844 | /* Queue the unregistration of this event. */ | |
845 | _lttng_event_unregister(event); | |
846 | break; | |
847 | } | |
848 | } | |
849 | } | |
850 | } | |
851 | ||
852 | /* Wait for grace period. */ | |
853 | synchronize_trace(); | |
854 | /* Prune the unregistration queue. */ | |
855 | __tracepoint_probe_prune_release_queue(); | |
856 | ||
857 | /* | |
858 | * It is now safe to destroy the events and remove them from the event list | |
859 | * and hashtables. | |
860 | */ | |
861 | for (i = 0; i < provider_desc->nr_events; i++) { | |
862 | const struct lttng_event_desc *event_desc; | |
863 | const char *event_name; | |
864 | size_t name_len; | |
865 | uint32_t hash; | |
866 | ||
867 | event_desc = provider_desc->event_desc[i]; | |
868 | event_name = event_desc->name; | |
869 | name_len = strlen(event_name); | |
870 | hash = jhash(event_name, name_len, 0); | |
871 | ||
872 | /* Iterate over all sessions to find the current event description. */ | |
873 | cds_list_for_each_entry(session, sessionsp, node) { | |
874 | /* | |
875 | * Get the list of events in the hashtable bucket and iterate to | |
876 | * find the event matching this descriptor. | |
877 | */ | |
878 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
879 | cds_hlist_for_each_entry_safe(event, node, tmp_node, head, hlist) { | |
880 | if (event_desc == event->desc) { | |
881 | /* Destroy enums of the current event. */ | |
882 | for (j = 0; j < event->desc->nr_fields; j++) { | |
883 | const struct lttng_enum_desc *enum_desc; | |
884 | const struct lttng_event_field *field; | |
885 | struct lttng_enum *curr_enum; | |
886 | ||
887 | field = &(event->desc->fields[j]); | |
218deb69 MD |
888 | switch (field->type.atype) { |
889 | case atype_enum: | |
890 | enum_desc = field->type.u.legacy.basic.enumeration.desc; | |
891 | break; | |
892 | case atype_enum_nestable: | |
893 | enum_desc = field->type.u.enum_nestable.desc; | |
894 | break; | |
895 | default: | |
35ac38cb FD |
896 | continue; |
897 | } | |
35ac38cb FD |
898 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); |
899 | if (curr_enum) { | |
900 | _lttng_enum_destroy(curr_enum); | |
901 | } | |
902 | } | |
903 | ||
904 | /* Destroy event. */ | |
905 | _lttng_event_destroy(event); | |
906 | break; | |
907 | } | |
908 | } | |
909 | } | |
910 | } | |
911 | } | |
912 | ||
8020ceb5 | 913 | /* |
e58095ef MD |
914 | * Create events associated with an enabler (if not already present), |
915 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
916 | */ |
917 | static | |
e58095ef | 918 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 919 | { |
e58095ef MD |
920 | struct lttng_session *session = enabler->chan->session; |
921 | struct lttng_event *event; | |
922 | ||
de713d8a FD |
923 | if (!enabler->enabled) |
924 | goto end; | |
925 | ||
e58095ef MD |
926 | /* First ensure that probe events are created for this enabler. */ |
927 | lttng_create_event_if_missing(enabler); | |
928 | ||
929 | /* For each event matching enabler in session event list. */ | |
930 | cds_list_for_each_entry(event, &session->events_head, node) { | |
931 | struct lttng_enabler_ref *enabler_ref; | |
932 | ||
933 | if (!lttng_event_match_enabler(event, enabler)) | |
934 | continue; | |
935 | ||
936 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
937 | if (!enabler_ref) { | |
938 | /* | |
939 | * If no backward ref, create it. | |
940 | * Add backward ref from event to enabler. | |
941 | */ | |
942 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
943 | if (!enabler_ref) | |
944 | return -ENOMEM; | |
945 | enabler_ref->ref = enabler; | |
946 | cds_list_add(&enabler_ref->node, | |
947 | &event->enablers_ref_head); | |
8165c8da | 948 | } |
e58095ef MD |
949 | |
950 | /* | |
951 | * Link filter bytecodes if not linked yet. | |
952 | */ | |
953 | lttng_enabler_event_link_bytecode(event, enabler); | |
954 | ||
955 | /* TODO: merge event context. */ | |
956 | } | |
de713d8a | 957 | end: |
e58095ef MD |
958 | return 0; |
959 | } | |
960 | ||
961 | /* | |
962 | * Called at library load: connect the probe on all enablers matching | |
963 | * this event. | |
5f733922 | 964 | * Called with session mutex held. |
e58095ef | 965 | */ |
5f733922 | 966 | int lttng_fix_pending_events(void) |
e58095ef MD |
967 | { |
968 | struct lttng_session *session; | |
969 | ||
970 | cds_list_for_each_entry(session, &sessions, node) { | |
971 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 972 | } |
e58095ef MD |
973 | return 0; |
974 | } | |
975 | ||
246be17e | 976 | /* |
37dddb65 MD |
977 | * For each session of the owner thread, execute pending statedump. |
978 | * Only dump state for the sessions owned by the caller thread, because | |
979 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 980 | */ |
3327ac33 | 981 | void lttng_handle_pending_statedump(void *owner) |
246be17e PW |
982 | { |
983 | struct lttng_session *session; | |
984 | ||
37dddb65 | 985 | /* Execute state dump */ |
cf73e0fe | 986 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
987 | |
988 | /* Clear pending state dump */ | |
3327ac33 MD |
989 | if (ust_lock()) { |
990 | goto end; | |
991 | } | |
246be17e | 992 | cds_list_for_each_entry(session, &sessions, node) { |
37dddb65 MD |
993 | if (session->owner != owner) |
994 | continue; | |
995 | if (!session->statedump_pending) | |
996 | continue; | |
997 | session->statedump_pending = 0; | |
246be17e | 998 | } |
3327ac33 | 999 | end: |
37dddb65 | 1000 | ust_unlock(); |
3327ac33 | 1001 | return; |
246be17e PW |
1002 | } |
1003 | ||
e58095ef MD |
1004 | /* |
1005 | * Only used internally at session destruction. | |
1006 | */ | |
1007 | static | |
1008 | void _lttng_event_destroy(struct lttng_event *event) | |
1009 | { | |
1010 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1011 | ||
35ac38cb | 1012 | /* Remove from event list. */ |
e58095ef | 1013 | cds_list_del(&event->node); |
35ac38cb FD |
1014 | /* Remove from event hash table. */ |
1015 | cds_hlist_del(&event->hlist); | |
1016 | ||
8020ceb5 | 1017 | lttng_destroy_context(event->ctx); |
f488575f | 1018 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1019 | /* Free event enabler refs */ |
1020 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
1021 | &event->enablers_ref_head, node) | |
1022 | free(enabler_ref); | |
b5234c06 | 1023 | free(event); |
8020ceb5 MD |
1024 | } |
1025 | ||
c785c634 MD |
1026 | static |
1027 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1028 | { | |
1029 | cds_list_del(&_enum->node); | |
35ac38cb | 1030 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1031 | free(_enum); |
1032 | } | |
1033 | ||
003fedf4 | 1034 | void lttng_ust_events_exit(void) |
8020ceb5 | 1035 | { |
7dd08bec | 1036 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1037 | |
e58095ef | 1038 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1039 | lttng_session_destroy(session); |
8020ceb5 | 1040 | } |
457a6b58 | 1041 | |
e58095ef MD |
1042 | /* |
1043 | * Enabler management. | |
1044 | */ | |
1045 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1046 | struct lttng_ust_event *event_param, | |
1047 | struct lttng_channel *chan) | |
457a6b58 | 1048 | { |
e58095ef MD |
1049 | struct lttng_enabler *enabler; |
1050 | ||
1051 | enabler = zmalloc(sizeof(*enabler)); | |
1052 | if (!enabler) | |
1053 | return NULL; | |
1054 | enabler->type = type; | |
1055 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
0f63324a | 1056 | CDS_INIT_LIST_HEAD(&enabler->excluder_head); |
e58095ef MD |
1057 | memcpy(&enabler->event_param, event_param, |
1058 | sizeof(enabler->event_param)); | |
1059 | enabler->chan = chan; | |
1060 | /* ctx left NULL */ | |
89f26d57 | 1061 | enabler->enabled = 0; |
e58095ef MD |
1062 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); |
1063 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1064 | return enabler; | |
457a6b58 MD |
1065 | } |
1066 | ||
e58095ef | 1067 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 1068 | { |
e58095ef MD |
1069 | enabler->enabled = 1; |
1070 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1071 | return 0; | |
457a6b58 | 1072 | } |
457a6b58 | 1073 | |
e58095ef | 1074 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 1075 | { |
e58095ef MD |
1076 | enabler->enabled = 0; |
1077 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1078 | return 0; | |
1079 | } | |
457a6b58 | 1080 | |
e58095ef MD |
1081 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1082 | struct lttng_ust_filter_bytecode_node *bytecode) | |
1083 | { | |
1084 | bytecode->enabler = enabler; | |
1085 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
1086 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1087 | return 0; | |
0bfb5cbd JI |
1088 | } |
1089 | ||
1090 | int lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
1091 | struct lttng_ust_excluder_node *excluder) | |
1092 | { | |
1093 | excluder->enabler = enabler; | |
1094 | cds_list_add_tail(&excluder->node, &enabler->excluder_head); | |
1095 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1096 | return 0; | |
e58095ef | 1097 | } |
f488575f | 1098 | |
e58095ef | 1099 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1100 | union ust_args *uargs, |
e58095ef MD |
1101 | struct lttng_ctx **ctx, struct lttng_session *session) |
1102 | { | |
457a6b58 | 1103 | /* |
e58095ef MD |
1104 | * We cannot attach a context after trace has been started for a |
1105 | * session because the metadata does not allow expressing this | |
1106 | * information outside of the original channel scope. | |
457a6b58 | 1107 | */ |
e58095ef MD |
1108 | if (session->been_active) |
1109 | return -EPERM; | |
457a6b58 | 1110 | |
e58095ef MD |
1111 | switch (context_param->ctx) { |
1112 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1113 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1114 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1115 | { | |
1116 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1117 | ||
1118 | perf_ctx_param = &context_param->u.perf_counter; | |
1119 | return lttng_add_perf_counter_to_ctx( | |
1120 | perf_ctx_param->type, | |
1121 | perf_ctx_param->config, | |
1122 | perf_ctx_param->name, | |
1123 | ctx); | |
1124 | } | |
e58095ef MD |
1125 | case LTTNG_UST_CONTEXT_VTID: |
1126 | return lttng_add_vtid_to_ctx(ctx); | |
1127 | case LTTNG_UST_CONTEXT_VPID: | |
1128 | return lttng_add_vpid_to_ctx(ctx); | |
1129 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1130 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1131 | case LTTNG_UST_CONTEXT_IP: |
1132 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1133 | case LTTNG_UST_CONTEXT_CPU_ID: |
1134 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1135 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1136 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1137 | ctx); | |
735bef47 MJ |
1138 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1139 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1140 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1141 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1142 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1143 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1144 | case LTTNG_UST_CONTEXT_NET_NS: | |
1145 | return lttng_add_net_ns_to_ctx(ctx); | |
1146 | case LTTNG_UST_CONTEXT_PID_NS: | |
1147 | return lttng_add_pid_ns_to_ctx(ctx); | |
cefef7a7 MJ |
1148 | case LTTNG_UST_CONTEXT_TIME_NS: |
1149 | return lttng_add_time_ns_to_ctx(ctx); | |
735bef47 MJ |
1150 | case LTTNG_UST_CONTEXT_USER_NS: |
1151 | return lttng_add_user_ns_to_ctx(ctx); | |
1152 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1153 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1154 | case LTTNG_UST_CONTEXT_VUID: |
1155 | return lttng_add_vuid_to_ctx(ctx); | |
1156 | case LTTNG_UST_CONTEXT_VEUID: | |
1157 | return lttng_add_veuid_to_ctx(ctx); | |
1158 | case LTTNG_UST_CONTEXT_VSUID: | |
1159 | return lttng_add_vsuid_to_ctx(ctx); | |
1160 | case LTTNG_UST_CONTEXT_VGID: | |
1161 | return lttng_add_vgid_to_ctx(ctx); | |
1162 | case LTTNG_UST_CONTEXT_VEGID: | |
1163 | return lttng_add_vegid_to_ctx(ctx); | |
1164 | case LTTNG_UST_CONTEXT_VSGID: | |
1165 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1166 | default: |
1167 | return -EINVAL; | |
457a6b58 | 1168 | } |
457a6b58 MD |
1169 | } |
1170 | ||
e58095ef MD |
1171 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1172 | struct lttng_ust_context *context_param) | |
457a6b58 | 1173 | { |
e58095ef MD |
1174 | #if 0 // disabled for now. |
1175 | struct lttng_session *session = enabler->chan->session; | |
1176 | int ret; | |
457a6b58 | 1177 | |
e58095ef MD |
1178 | ret = lttng_attach_context(context_param, &enabler->ctx, |
1179 | session); | |
1180 | if (ret) | |
1181 | return ret; | |
1182 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1183 | #endif | |
1184 | return -ENOSYS; | |
457a6b58 MD |
1185 | } |
1186 | ||
e58095ef MD |
1187 | static |
1188 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 1189 | { |
e58095ef | 1190 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
0f63324a | 1191 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
457a6b58 | 1192 | |
e58095ef MD |
1193 | /* Destroy filter bytecode */ |
1194 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1195 | &enabler->filter_bytecode_head, node) { | |
1196 | free(filter_node); | |
457a6b58 | 1197 | } |
e58095ef | 1198 | |
0f63324a JI |
1199 | /* Destroy excluders */ |
1200 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
1201 | &enabler->excluder_head, node) { | |
1202 | free(excluder_node); | |
1203 | } | |
1204 | ||
e58095ef MD |
1205 | /* Destroy contexts */ |
1206 | lttng_destroy_context(enabler->ctx); | |
1207 | ||
1208 | cds_list_del(&enabler->node); | |
1209 | free(enabler); | |
457a6b58 MD |
1210 | } |
1211 | ||
e58095ef MD |
1212 | /* |
1213 | * lttng_session_sync_enablers should be called just before starting a | |
1214 | * session. | |
1215 | */ | |
457a6b58 | 1216 | static |
e58095ef | 1217 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 1218 | { |
e58095ef MD |
1219 | struct lttng_enabler *enabler; |
1220 | struct lttng_event *event; | |
457a6b58 | 1221 | |
e58095ef MD |
1222 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
1223 | lttng_enabler_ref_events(enabler); | |
1224 | /* | |
1225 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1226 | * and its channel and session transient states are enabled, we |
1227 | * enable the event, else we disable it. | |
e58095ef MD |
1228 | */ |
1229 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1230 | struct lttng_enabler_ref *enabler_ref; | |
1231 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1232 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1233 | |
1234 | /* Enable events */ | |
1235 | cds_list_for_each_entry(enabler_ref, | |
1236 | &event->enablers_ref_head, node) { | |
1237 | if (enabler_ref->ref->enabled) { | |
1238 | enabled = 1; | |
1239 | break; | |
1240 | } | |
1241 | } | |
ac6b4ac6 MD |
1242 | /* |
1243 | * Enabled state is based on union of enablers, with | |
1244 | * intesection of session and channel transient enable | |
1245 | * states. | |
1246 | */ | |
1247 | enabled = enabled && session->tstate && event->chan->tstate; | |
1248 | ||
1249 | CMM_STORE_SHARED(event->enabled, enabled); | |
1250 | /* | |
1251 | * Sync tracepoint registration with event enabled | |
1252 | * state. | |
1253 | */ | |
1254 | if (enabled) { | |
1255 | if (!event->registered) | |
1256 | register_event(event); | |
1257 | } else { | |
1258 | if (event->registered) | |
1259 | unregister_event(event); | |
1260 | } | |
457a6b58 | 1261 | |
1f49fc05 | 1262 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1263 | cds_list_for_each_entry(enabler_ref, |
1264 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1265 | if (enabler_ref->ref->enabled |
1266 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1267 | has_enablers_without_bytecode = 1; |
1268 | break; | |
1269 | } | |
1270 | } | |
1271 | event->has_enablers_without_bytecode = | |
1272 | has_enablers_without_bytecode; | |
1273 | ||
e58095ef MD |
1274 | /* Enable filters */ |
1275 | cds_list_for_each_entry(runtime, | |
1276 | &event->bytecode_runtime_head, node) { | |
1277 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
1278 | } |
1279 | } | |
baa1e0bc | 1280 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1281 | } |
1282 | ||
e58095ef MD |
1283 | /* |
1284 | * Apply enablers to session events, adding events to session if need | |
1285 | * be. It is required after each modification applied to an active | |
1286 | * session, and right before session "start". | |
1287 | * "lazy" sync means we only sync if required. | |
1288 | */ | |
1289 | static | |
1290 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 1291 | { |
e58095ef MD |
1292 | /* We can skip if session is not active */ |
1293 | if (!session->active) | |
1294 | return; | |
1295 | lttng_session_sync_enablers(session); | |
457a6b58 | 1296 | } |
53569322 MD |
1297 | |
1298 | /* | |
1299 | * Update all sessions with the given app context. | |
1300 | * Called with ust lock held. | |
1301 | * This is invoked when an application context gets loaded/unloaded. It | |
1302 | * ensures the context callbacks are in sync with the application | |
1303 | * context (either app context callbacks, or dummy callbacks). | |
1304 | */ | |
1305 | void lttng_ust_context_set_session_provider(const char *name, | |
1306 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1307 | void (*record)(struct lttng_ctx_field *field, | |
1308 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1309 | struct lttng_channel *chan), | |
1310 | void (*get_value)(struct lttng_ctx_field *field, | |
1311 | struct lttng_ctx_value *value)) | |
1312 | { | |
1313 | struct lttng_session *session; | |
1314 | ||
1315 | cds_list_for_each_entry(session, &sessions, node) { | |
1316 | struct lttng_channel *chan; | |
1317 | struct lttng_event *event; | |
1318 | int ret; | |
1319 | ||
1320 | ret = lttng_ust_context_set_provider_rcu(&session->ctx, | |
1321 | name, get_size, record, get_value); | |
1322 | if (ret) | |
1323 | abort(); | |
1324 | cds_list_for_each_entry(chan, &session->chan_head, node) { | |
1325 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, | |
1326 | name, get_size, record, get_value); | |
1327 | if (ret) | |
1328 | abort(); | |
1329 | } | |
1330 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1331 | ret = lttng_ust_context_set_provider_rcu(&event->ctx, | |
1332 | name, get_size, record, get_value); | |
1333 | if (ret) | |
1334 | abort(); | |
1335 | } | |
1336 | } | |
1337 | } |