Commit | Line | Data |
---|---|---|
8020ceb5 | 1 | /* |
7dd08bec | 2 | * lttng-events.c |
8020ceb5 | 3 | * |
8020ceb5 MD |
4 | * Holds LTTng per-session event registry. |
5 | * | |
e92f3e28 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
8020ceb5 MD |
21 | */ |
22 | ||
b5234c06 MD |
23 | #define _GNU_SOURCE |
24 | #include <stdio.h> | |
25 | #include <urcu/list.h> | |
8165c8da | 26 | #include <urcu/hlist.h> |
b5234c06 | 27 | #include <pthread.h> |
b5234c06 | 28 | #include <errno.h> |
f4681817 MD |
29 | #include <sys/shm.h> |
30 | #include <sys/ipc.h> | |
44c72f10 MD |
31 | #include <stdint.h> |
32 | #include <stddef.h> | |
28b12049 MD |
33 | #include <inttypes.h> |
34 | #include <time.h> | |
2ae57758 | 35 | #include <lttng/ust-endian.h> |
28b12049 | 36 | #include "clock.h" |
44c72f10 MD |
37 | |
38 | #include <urcu-bp.h> | |
39 | #include <urcu/compiler.h> | |
40 | #include <urcu/uatomic.h> | |
41 | #include <urcu/arch.h> | |
42 | ||
43 | #include <lttng/tracepoint.h> | |
4318ae1b | 44 | #include <lttng/ust-events.h> |
44c72f10 MD |
45 | |
46 | #include <usterr-signal-safe.h> | |
47 | #include <helper.h> | |
1f18504e | 48 | #include "error.h" |
08114193 | 49 | #include "compat.h" |
eda498b8 | 50 | #include "lttng-ust-uuid.h" |
44c72f10 | 51 | |
457a6b58 | 52 | #include "tracepoint-internal.h" |
7dd08bec MD |
53 | #include "lttng-tracer.h" |
54 | #include "lttng-tracer-core.h" | |
b728d87e | 55 | #include "wait.h" |
8d8a24c8 | 56 | #include "../libringbuffer/shm.h" |
596c4223 | 57 | #include "jhash.h" |
8165c8da MD |
58 | |
59 | /* | |
60 | * The sessions mutex is the centralized mutex across UST tracing | |
17dfb34b MD |
61 | * control and probe registration. All operations within this file are |
62 | * called by the communication thread, under ust_lock protection. | |
8165c8da | 63 | */ |
2b2d6ff7 | 64 | static pthread_mutex_t sessions_mutex = PTHREAD_MUTEX_INITIALIZER; |
8165c8da | 65 | |
17dfb34b | 66 | void ust_lock(void) |
8165c8da MD |
67 | { |
68 | pthread_mutex_lock(&sessions_mutex); | |
69 | } | |
70 | ||
17dfb34b | 71 | void ust_unlock(void) |
8165c8da MD |
72 | { |
73 | pthread_mutex_unlock(&sessions_mutex); | |
74 | } | |
75 | ||
b5234c06 | 76 | static CDS_LIST_HEAD(sessions); |
8165c8da | 77 | |
7dd08bec | 78 | static void _lttng_event_destroy(struct lttng_event *event); |
7dd08bec MD |
79 | static void _lttng_channel_destroy(struct lttng_channel *chan); |
80 | static int _lttng_event_unregister(struct lttng_event *event); | |
8020ceb5 | 81 | static |
7dd08bec MD |
82 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
83 | struct lttng_channel *chan, | |
84 | struct lttng_event *event); | |
8020ceb5 | 85 | static |
7dd08bec | 86 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
8020ceb5 | 87 | |
e58095ef MD |
88 | static |
89 | void lttng_session_lazy_sync_enablers(struct lttng_session *session); | |
90 | static | |
91 | void lttng_session_sync_enablers(struct lttng_session *session); | |
92 | static | |
93 | void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
94 | ||
95 | static | |
96 | int lttng_loglevel_match(int loglevel, | |
97 | unsigned int has_loglevel, | |
457a6b58 MD |
98 | enum lttng_ust_loglevel_type req_type, |
99 | int req_loglevel) | |
100 | { | |
457a6b58 MD |
101 | if (req_type == LTTNG_UST_LOGLEVEL_ALL) |
102 | return 1; | |
e58095ef MD |
103 | if (!has_loglevel) |
104 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
105 | switch (req_type) { |
106 | case LTTNG_UST_LOGLEVEL_RANGE: | |
e58095ef | 107 | if (loglevel <= req_loglevel || req_loglevel == -1) |
457a6b58 MD |
108 | return 1; |
109 | else | |
110 | return 0; | |
111 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
e58095ef | 112 | if (loglevel == req_loglevel || req_loglevel == -1) |
457a6b58 MD |
113 | return 1; |
114 | else | |
115 | return 0; | |
116 | case LTTNG_UST_LOGLEVEL_ALL: | |
117 | default: | |
118 | return 1; | |
119 | } | |
120 | } | |
121 | ||
8020ceb5 MD |
122 | void synchronize_trace(void) |
123 | { | |
8020ceb5 | 124 | synchronize_rcu(); |
8020ceb5 MD |
125 | } |
126 | ||
7dd08bec | 127 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 128 | { |
7dd08bec | 129 | struct lttng_session *session; |
19d8b1b3 | 130 | int ret; |
8020ceb5 | 131 | |
7dd08bec | 132 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
133 | if (!session) |
134 | return NULL; | |
e58095ef MD |
135 | CDS_INIT_LIST_HEAD(&session->chan_head); |
136 | CDS_INIT_LIST_HEAD(&session->events_head); | |
137 | CDS_INIT_LIST_HEAD(&session->enablers_head); | |
19d8b1b3 MD |
138 | ret = lttng_ust_uuid_generate(session->uuid); |
139 | if (ret != 0) { | |
140 | session->uuid[0] = '\0'; | |
141 | } | |
e58095ef | 142 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
143 | return session; |
144 | } | |
145 | ||
7dd08bec | 146 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 147 | { |
7dd08bec MD |
148 | struct lttng_channel *chan, *tmpchan; |
149 | struct lttng_event *event, *tmpevent; | |
e58095ef | 150 | struct lttng_enabler *enabler, *tmpenabler; |
8020ceb5 MD |
151 | int ret; |
152 | ||
b5234c06 | 153 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 154 | cds_list_for_each_entry(event, &session->events_head, node) { |
7dd08bec | 155 | ret = _lttng_event_unregister(event); |
8020ceb5 MD |
156 | WARN_ON(ret); |
157 | } | |
158 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e58095ef MD |
159 | cds_list_for_each_entry_safe(enabler, tmpenabler, |
160 | &session->enablers_head, node) | |
161 | lttng_enabler_destroy(enabler); | |
162 | cds_list_for_each_entry_safe(event, tmpevent, | |
163 | &session->events_head, node) | |
7dd08bec | 164 | _lttng_event_destroy(event); |
e58095ef | 165 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
7dd08bec | 166 | _lttng_channel_destroy(chan); |
e58095ef | 167 | cds_list_del(&session->node); |
b5234c06 | 168 | free(session); |
8020ceb5 MD |
169 | } |
170 | ||
7dd08bec | 171 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
172 | { |
173 | int ret = 0; | |
7dd08bec | 174 | struct lttng_channel *chan; |
8020ceb5 | 175 | |
8020ceb5 MD |
176 | if (session->active) { |
177 | ret = -EBUSY; | |
178 | goto end; | |
179 | } | |
180 | ||
e58095ef MD |
181 | /* We need to sync enablers with session before activation. */ |
182 | lttng_session_sync_enablers(session); | |
183 | ||
8020ceb5 MD |
184 | /* |
185 | * Snapshot the number of events per channel to know the type of header | |
186 | * we need to use. | |
187 | */ | |
e58095ef | 188 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
8020ceb5 MD |
189 | if (chan->header_type) |
190 | continue; /* don't change it if session stop/restart */ | |
191 | if (chan->free_event_id < 31) | |
192 | chan->header_type = 1; /* compact */ | |
193 | else | |
194 | chan->header_type = 2; /* large */ | |
195 | } | |
196 | ||
b5234c06 MD |
197 | CMM_ACCESS_ONCE(session->active) = 1; |
198 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
7dd08bec | 199 | ret = _lttng_session_metadata_statedump(session); |
4b4de73e | 200 | if (ret) |
b5234c06 | 201 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 202 | end: |
8020ceb5 MD |
203 | return ret; |
204 | } | |
205 | ||
7dd08bec | 206 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
207 | { |
208 | int ret = 0; | |
209 | ||
8020ceb5 MD |
210 | if (!session->active) { |
211 | ret = -EBUSY; | |
212 | goto end; | |
213 | } | |
b5234c06 | 214 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 215 | end: |
8020ceb5 MD |
216 | return ret; |
217 | } | |
218 | ||
7dd08bec | 219 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea MD |
220 | { |
221 | int old; | |
222 | ||
9beb36ba MD |
223 | if (channel == channel->session->metadata) |
224 | return -EPERM; | |
b5234c06 | 225 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
226 | if (old) |
227 | return -EEXIST; | |
228 | return 0; | |
229 | } | |
230 | ||
7dd08bec | 231 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea MD |
232 | { |
233 | int old; | |
234 | ||
9beb36ba MD |
235 | if (channel == channel->session->metadata) |
236 | return -EPERM; | |
b5234c06 | 237 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
238 | if (!old) |
239 | return -EEXIST; | |
240 | return 0; | |
241 | } | |
242 | ||
7dd08bec | 243 | int lttng_event_enable(struct lttng_event *event) |
976fe9ea MD |
244 | { |
245 | int old; | |
246 | ||
9beb36ba MD |
247 | if (event->chan == event->chan->session->metadata) |
248 | return -EPERM; | |
b5234c06 | 249 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
250 | if (old) |
251 | return -EEXIST; | |
252 | return 0; | |
253 | } | |
254 | ||
7dd08bec | 255 | int lttng_event_disable(struct lttng_event *event) |
976fe9ea MD |
256 | { |
257 | int old; | |
258 | ||
9beb36ba MD |
259 | if (event->chan == event->chan->session->metadata) |
260 | return -EPERM; | |
b5234c06 | 261 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
262 | if (!old) |
263 | return -EEXIST; | |
264 | return 0; | |
265 | } | |
266 | ||
7dd08bec | 267 | struct lttng_channel *lttng_channel_create(struct lttng_session *session, |
8020ceb5 MD |
268 | const char *transport_name, |
269 | void *buf_addr, | |
270 | size_t subbuf_size, size_t num_subbuf, | |
271 | unsigned int switch_timer_interval, | |
193183fb | 272 | unsigned int read_timer_interval, |
ef9ff354 MD |
273 | int **shm_fd, int **wait_fd, |
274 | uint64_t **memory_map_size, | |
7dd08bec | 275 | struct lttng_channel *chan_priv_init) |
8020ceb5 | 276 | { |
7dd08bec MD |
277 | struct lttng_channel *chan = NULL; |
278 | struct lttng_transport *transport; | |
8020ceb5 | 279 | |
8020ceb5 MD |
280 | if (session->been_active) |
281 | goto active; /* Refuse to add channel to active session */ | |
7dd08bec | 282 | transport = lttng_transport_find(transport_name); |
8020ceb5 | 283 | if (!transport) { |
b5234c06 | 284 | DBG("LTTng transport %s not found\n", |
8020ceb5 MD |
285 | transport_name); |
286 | goto notransport; | |
287 | } | |
d028eddb MD |
288 | chan_priv_init->id = session->free_chan_id++; |
289 | chan_priv_init->session = session; | |
8020ceb5 MD |
290 | /* |
291 | * Note: the channel creation op already writes into the packet | |
292 | * headers. Therefore the "chan" information used as input | |
293 | * should be already accessible. | |
294 | */ | |
e7372d13 | 295 | chan = transport->ops.channel_create(transport_name, buf_addr, |
8020ceb5 | 296 | subbuf_size, num_subbuf, switch_timer_interval, |
193183fb | 297 | read_timer_interval, shm_fd, wait_fd, |
d028eddb | 298 | memory_map_size, chan_priv_init); |
a3f61e7f | 299 | if (!chan) |
8020ceb5 | 300 | goto create_error; |
976fe9ea | 301 | chan->enabled = 1; |
8020ceb5 | 302 | chan->ops = &transport->ops; |
e58095ef | 303 | cds_list_add(&chan->node, &session->chan_head); |
8020ceb5 MD |
304 | return chan; |
305 | ||
306 | create_error: | |
8020ceb5 MD |
307 | notransport: |
308 | active: | |
8020ceb5 MD |
309 | return NULL; |
310 | } | |
311 | ||
312 | /* | |
313 | * Only used internally at session destruction. | |
314 | */ | |
315 | static | |
7dd08bec | 316 | void _lttng_channel_destroy(struct lttng_channel *chan) |
8020ceb5 | 317 | { |
e58095ef | 318 | cds_list_del(&chan->node); |
8020ceb5 | 319 | lttng_destroy_context(chan->ctx); |
a3f61e7f | 320 | chan->ops->channel_destroy(chan); |
8020ceb5 MD |
321 | } |
322 | ||
323 | /* | |
324 | * Supports event creation while tracing session is active. | |
325 | */ | |
e58095ef MD |
326 | static |
327 | int lttng_event_create(const struct lttng_event_desc *desc, | |
328 | struct lttng_channel *chan) | |
8020ceb5 | 329 | { |
e58095ef | 330 | const char *event_name = desc->name; |
7dd08bec | 331 | struct lttng_event *event; |
576599a0 | 332 | int ret = 0; |
8020ceb5 | 333 | |
38eb0baa | 334 | if (chan->used_event_id == -1U) { |
576599a0 | 335 | ret = -ENOMEM; |
8020ceb5 | 336 | goto full; |
576599a0 | 337 | } |
8020ceb5 MD |
338 | /* |
339 | * This is O(n^2) (for each event, the loop is called at event | |
340 | * creation). Might require a hash if we have lots of events. | |
341 | */ | |
e58095ef MD |
342 | cds_list_for_each_entry(event, &chan->session->events_head, node) { |
343 | assert(event->desc); | |
344 | if (!strncmp(event->desc->name, | |
345 | desc->name, | |
ff412fb5 | 346 | LTTNG_UST_SYM_NAME_LEN - 1)) { |
576599a0 | 347 | ret = -EEXIST; |
8020ceb5 | 348 | goto exist; |
576599a0 MD |
349 | } |
350 | } | |
457a6b58 MD |
351 | |
352 | /* | |
353 | * Check if loglevel match. Refuse to connect event if not. | |
354 | */ | |
7dd08bec | 355 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
356 | if (!event) { |
357 | ret = -ENOMEM; | |
8020ceb5 | 358 | goto cache_error; |
576599a0 | 359 | } |
8020ceb5 | 360 | event->chan = chan; |
e58095ef | 361 | |
8165c8da MD |
362 | /* |
363 | * used_event_id counts the maximum number of event IDs that can | |
364 | * register if all probes register. | |
365 | */ | |
366 | chan->used_event_id++; | |
976fe9ea | 367 | event->enabled = 1; |
e58095ef MD |
368 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
369 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
370 | event->desc = desc; | |
7dd08bec | 371 | /* Populate lttng_event structure before tracepoint registration. */ |
b5234c06 | 372 | cmm_smp_wmb(); |
e58095ef MD |
373 | ret = __tracepoint_probe_register(event_name, |
374 | desc->probe_callback, | |
375 | event, desc->signature); | |
376 | if (ret) | |
377 | goto register_error; | |
378 | event->id = chan->free_event_id++; | |
379 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); | |
380 | if (ret) | |
381 | goto statedump_error; | |
382 | cds_list_add(&event->node, &chan->session->events_head); | |
576599a0 | 383 | return 0; |
8020ceb5 MD |
384 | |
385 | statedump_error: | |
e58095ef MD |
386 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_name, |
387 | desc->probe_callback, | |
388 | event)); | |
389 | lttng_event_put(event->desc); | |
8020ceb5 | 390 | register_error: |
b5234c06 | 391 | free(event); |
8020ceb5 MD |
392 | cache_error: |
393 | exist: | |
394 | full: | |
576599a0 | 395 | return ret; |
8020ceb5 MD |
396 | } |
397 | ||
e58095ef MD |
398 | static |
399 | int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, | |
400 | struct lttng_enabler *enabler) | |
401 | { | |
402 | int loglevel = 0; | |
403 | unsigned int has_loglevel; | |
404 | ||
405 | assert(enabler->type == LTTNG_ENABLER_WILDCARD); | |
406 | /* Compare excluding final '*' */ | |
407 | if (strncmp(desc->name, enabler->event_param.name, | |
408 | strlen(enabler->event_param.name) - 1)) | |
409 | return 0; | |
410 | if (desc->loglevel) { | |
411 | loglevel = *(*desc->loglevel); | |
412 | has_loglevel = 1; | |
413 | } | |
414 | if (!lttng_loglevel_match(loglevel, | |
415 | has_loglevel, | |
416 | enabler->event_param.loglevel_type, | |
417 | enabler->event_param.loglevel)) | |
418 | return 0; | |
419 | return 1; | |
420 | } | |
421 | ||
422 | static | |
423 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
424 | struct lttng_enabler *enabler) | |
425 | { | |
426 | int loglevel = 0; | |
427 | unsigned int has_loglevel = 0; | |
428 | ||
429 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
430 | if (strcmp(desc->name, enabler->event_param.name)) | |
431 | return 0; | |
432 | if (desc->loglevel) { | |
433 | loglevel = *(*desc->loglevel); | |
434 | has_loglevel = 1; | |
435 | } | |
436 | if (!lttng_loglevel_match(loglevel, | |
437 | has_loglevel, | |
438 | enabler->event_param.loglevel_type, | |
439 | enabler->event_param.loglevel)) | |
440 | return 0; | |
441 | return 1; | |
442 | } | |
443 | ||
444 | static | |
445 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
446 | struct lttng_enabler *enabler) | |
447 | { | |
448 | switch (enabler->type) { | |
449 | case LTTNG_ENABLER_WILDCARD: | |
450 | return lttng_desc_match_wildcard_enabler(desc, enabler); | |
451 | case LTTNG_ENABLER_EVENT: | |
452 | return lttng_desc_match_event_enabler(desc, enabler); | |
453 | default: | |
454 | return -EINVAL; | |
455 | } | |
456 | } | |
457 | ||
458 | static | |
459 | int lttng_event_match_enabler(struct lttng_event *event, | |
460 | struct lttng_enabler *enabler) | |
461 | { | |
462 | return lttng_desc_match_enabler(event->desc, enabler); | |
463 | } | |
464 | ||
465 | static | |
466 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
467 | struct lttng_enabler *enabler) | |
468 | { | |
469 | struct lttng_enabler_ref *enabler_ref; | |
470 | ||
471 | cds_list_for_each_entry(enabler_ref, | |
472 | &event->enablers_ref_head, node) { | |
473 | if (enabler_ref->ref == enabler) | |
474 | return enabler_ref; | |
475 | } | |
476 | return NULL; | |
477 | } | |
478 | ||
8020ceb5 | 479 | /* |
e58095ef MD |
480 | * Create struct lttng_event if it is missing and present in the list of |
481 | * tracepoint probes. | |
8020ceb5 | 482 | */ |
e58095ef MD |
483 | static |
484 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 485 | { |
e58095ef MD |
486 | struct lttng_session *session = enabler->chan->session; |
487 | struct lttng_probe_desc *probe_desc; | |
488 | const struct lttng_event_desc *desc; | |
489 | struct lttng_event *event; | |
490 | int i; | |
491 | struct cds_list_head *probe_list; | |
492 | ||
493 | probe_list = lttng_get_probe_list_head(); | |
494 | /* | |
495 | * For each probe event, if we find that a probe event matches | |
496 | * our enabler, create an associated lttng_event if not | |
497 | * already present. | |
498 | */ | |
499 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
500 | for (i = 0; i < probe_desc->nr_events; i++) { | |
501 | int found = 0, ret; | |
502 | ||
503 | desc = probe_desc->event_desc[i]; | |
504 | if (!lttng_desc_match_enabler(desc, enabler)) | |
505 | continue; | |
506 | ||
507 | /* | |
508 | * For each event in session event list, | |
509 | * check if already created. | |
510 | */ | |
511 | cds_list_for_each_entry(event, | |
512 | &session->events_head, node) { | |
513 | if (event->desc == desc) | |
514 | found = 1; | |
515 | } | |
516 | if (found) | |
517 | continue; | |
518 | ||
519 | /* | |
520 | * We need to create an event for this | |
521 | * event probe. | |
522 | */ | |
523 | ret = lttng_event_create(probe_desc->event_desc[i], | |
524 | enabler->chan); | |
525 | if (ret) { | |
526 | DBG("Unable to create event %s\n", | |
527 | probe_desc->event_desc[i]->name); | |
528 | } | |
8165c8da | 529 | } |
8020ceb5 | 530 | } |
8020ceb5 MD |
531 | } |
532 | ||
533 | /* | |
e58095ef MD |
534 | * Create events associated with an enabler (if not already present), |
535 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
536 | */ |
537 | static | |
e58095ef | 538 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 539 | { |
e58095ef MD |
540 | struct lttng_session *session = enabler->chan->session; |
541 | struct lttng_event *event; | |
542 | ||
543 | /* First ensure that probe events are created for this enabler. */ | |
544 | lttng_create_event_if_missing(enabler); | |
545 | ||
546 | /* For each event matching enabler in session event list. */ | |
547 | cds_list_for_each_entry(event, &session->events_head, node) { | |
548 | struct lttng_enabler_ref *enabler_ref; | |
549 | ||
550 | if (!lttng_event_match_enabler(event, enabler)) | |
551 | continue; | |
552 | ||
553 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
554 | if (!enabler_ref) { | |
555 | /* | |
556 | * If no backward ref, create it. | |
557 | * Add backward ref from event to enabler. | |
558 | */ | |
559 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
560 | if (!enabler_ref) | |
561 | return -ENOMEM; | |
562 | enabler_ref->ref = enabler; | |
563 | cds_list_add(&enabler_ref->node, | |
564 | &event->enablers_ref_head); | |
8165c8da | 565 | } |
e58095ef MD |
566 | |
567 | /* | |
568 | * Link filter bytecodes if not linked yet. | |
569 | */ | |
570 | lttng_enabler_event_link_bytecode(event, enabler); | |
571 | ||
572 | /* TODO: merge event context. */ | |
573 | } | |
574 | return 0; | |
575 | } | |
576 | ||
577 | /* | |
578 | * Called at library load: connect the probe on all enablers matching | |
579 | * this event. | |
580 | * called with session mutex held. | |
581 | * TODO: currently, for each desc added, we iterate on all event desc | |
582 | * (inefficient). We should create specific code that only target the | |
583 | * added desc. | |
584 | */ | |
585 | int lttng_fix_pending_event_desc(const struct lttng_event_desc *desc) | |
586 | { | |
587 | struct lttng_session *session; | |
588 | ||
589 | cds_list_for_each_entry(session, &sessions, node) { | |
590 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 591 | } |
e58095ef MD |
592 | return 0; |
593 | } | |
594 | ||
595 | /* | |
596 | * Only used internally at session destruction. | |
597 | */ | |
598 | int _lttng_event_unregister(struct lttng_event *event) | |
599 | { | |
600 | return __tracepoint_probe_unregister(event->desc->name, | |
601 | event->desc->probe_callback, | |
602 | event); | |
603 | } | |
604 | ||
605 | /* | |
606 | * Only used internally at session destruction. | |
607 | */ | |
608 | static | |
609 | void _lttng_event_destroy(struct lttng_event *event) | |
610 | { | |
611 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
612 | ||
613 | lttng_event_put(event->desc); | |
614 | cds_list_del(&event->node); | |
8020ceb5 | 615 | lttng_destroy_context(event->ctx); |
f488575f | 616 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
617 | /* Free event enabler refs */ |
618 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
619 | &event->enablers_ref_head, node) | |
620 | free(enabler_ref); | |
b5234c06 | 621 | free(event); |
8020ceb5 MD |
622 | } |
623 | ||
624 | /* | |
625 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 626 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
627 | * remaining space left in packet and write, since mutual exclusion |
628 | * protects us from concurrent writes. | |
629 | */ | |
7dd08bec | 630 | int lttng_metadata_printf(struct lttng_session *session, |
8020ceb5 MD |
631 | const char *fmt, ...) |
632 | { | |
4cfec15c | 633 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
7dd08bec | 634 | struct lttng_channel *chan = session->metadata; |
b5234c06 | 635 | char *str = NULL; |
8020ceb5 MD |
636 | int ret = 0, waitret; |
637 | size_t len, reserve_len, pos; | |
638 | va_list ap; | |
639 | ||
b5234c06 | 640 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
641 | |
642 | va_start(ap, fmt); | |
b5234c06 | 643 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 644 | va_end(ap); |
b5234c06 | 645 | if (ret < 0) |
8020ceb5 MD |
646 | return -ENOMEM; |
647 | ||
648 | len = strlen(str); | |
649 | pos = 0; | |
650 | ||
651 | for (pos = 0; pos < len; pos += reserve_len) { | |
652 | reserve_len = min_t(size_t, | |
1d498196 | 653 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
654 | len - pos); |
655 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 656 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
657 | /* |
658 | * We don't care about metadata buffer's records lost | |
659 | * count, because we always retry here. Report error if | |
660 | * we need to bail out after timeout or being | |
661 | * interrupted. | |
662 | */ | |
b5234c06 | 663 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
664 | ({ |
665 | ret = chan->ops->event_reserve(&ctx, 0); | |
666 | ret != -ENOBUFS || !ret; | |
667 | }), | |
b5234c06 | 668 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 669 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
670 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
671 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 672 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 673 | if (waitret == -EINTR) |
8020ceb5 MD |
674 | ret = waitret; |
675 | goto end; | |
676 | } | |
677 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
678 | chan->ops->event_commit(&ctx); | |
679 | } | |
680 | end: | |
b5234c06 | 681 | free(str); |
8020ceb5 MD |
682 | return ret; |
683 | } | |
684 | ||
685 | static | |
7dd08bec | 686 | int _lttng_field_statedump(struct lttng_session *session, |
8020ceb5 MD |
687 | const struct lttng_event_field *field) |
688 | { | |
689 | int ret = 0; | |
690 | ||
180901e6 | 691 | if (field->nowrite) |
4774c8f3 MD |
692 | return 0; |
693 | ||
8020ceb5 MD |
694 | switch (field->type.atype) { |
695 | case atype_integer: | |
696 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 697 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
698 | field->type.u.basic.integer.size, |
699 | field->type.u.basic.integer.alignment, | |
700 | field->type.u.basic.integer.signedness, | |
701 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
702 | ? "none" | |
703 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
704 | ? "UTF8" | |
705 | : "ASCII", | |
706 | field->type.u.basic.integer.base, | |
8a98a75d | 707 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
708 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
709 | #else | |
710 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
711 | #endif | |
712 | field->name); | |
713 | break; | |
714 | case atype_float: | |
715 | ret = lttng_metadata_printf(session, | |
8a98a75d | 716 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
717 | field->type.u.basic._float.exp_dig, |
718 | field->type.u.basic._float.mant_dig, | |
719 | field->type.u.basic._float.alignment, | |
8a98a75d | 720 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
721 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
722 | #else | |
723 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
724 | #endif | |
725 | field->name); | |
726 | break; | |
727 | case atype_enum: | |
728 | ret = lttng_metadata_printf(session, | |
729 | " %s %s;\n", | |
730 | field->type.u.basic.enumeration.name, | |
731 | field->name); | |
732 | break; | |
733 | case atype_array: | |
734 | { | |
735 | const struct lttng_basic_type *elem_type; | |
736 | ||
737 | elem_type = &field->type.u.array.elem_type; | |
738 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 739 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
740 | elem_type->u.basic.integer.size, |
741 | elem_type->u.basic.integer.alignment, | |
742 | elem_type->u.basic.integer.signedness, | |
743 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
744 | ? "none" | |
745 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
746 | ? "UTF8" | |
747 | : "ASCII", | |
748 | elem_type->u.basic.integer.base, | |
8a98a75d | 749 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
750 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
751 | #else | |
752 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
753 | #endif | |
754 | field->name, field->type.u.array.length); | |
755 | break; | |
756 | } | |
757 | case atype_sequence: | |
758 | { | |
759 | const struct lttng_basic_type *elem_type; | |
760 | const struct lttng_basic_type *length_type; | |
761 | ||
762 | elem_type = &field->type.u.sequence.elem_type; | |
763 | length_type = &field->type.u.sequence.length_type; | |
764 | ret = lttng_metadata_printf(session, | |
765 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
766 | length_type->u.basic.integer.size, | |
767 | (unsigned int) length_type->u.basic.integer.alignment, | |
768 | length_type->u.basic.integer.signedness, | |
769 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
770 | ? "none" | |
771 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
772 | ? "UTF8" | |
773 | : "ASCII"), | |
774 | length_type->u.basic.integer.base, | |
8a98a75d | 775 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
776 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
777 | #else | |
778 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
779 | #endif | |
780 | field->name); | |
781 | if (ret) | |
782 | return ret; | |
783 | ||
784 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 785 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
786 | elem_type->u.basic.integer.size, |
787 | (unsigned int) elem_type->u.basic.integer.alignment, | |
788 | elem_type->u.basic.integer.signedness, | |
789 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
790 | ? "none" | |
791 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
792 | ? "UTF8" | |
793 | : "ASCII"), | |
794 | elem_type->u.basic.integer.base, | |
8a98a75d | 795 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
796 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
797 | #else | |
798 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
799 | #endif | |
800 | field->name, | |
801 | field->name); | |
802 | break; | |
803 | } | |
804 | ||
805 | case atype_string: | |
806 | /* Default encoding is UTF8 */ | |
807 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 808 | " string%s _%s;\n", |
8020ceb5 MD |
809 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
810 | " { encoding = ASCII; }" : "", | |
811 | field->name); | |
812 | break; | |
813 | default: | |
814 | WARN_ON_ONCE(1); | |
815 | return -EINVAL; | |
816 | } | |
817 | return ret; | |
818 | } | |
819 | ||
820 | static | |
7dd08bec | 821 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8020ceb5 MD |
822 | struct lttng_ctx *ctx) |
823 | { | |
824 | int ret = 0; | |
825 | int i; | |
826 | ||
827 | if (!ctx) | |
828 | return 0; | |
829 | for (i = 0; i < ctx->nr_fields; i++) { | |
830 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
831 | ||
7dd08bec | 832 | ret = _lttng_field_statedump(session, &field->event_field); |
8020ceb5 MD |
833 | if (ret) |
834 | return ret; | |
835 | } | |
836 | return ret; | |
837 | } | |
838 | ||
839 | static | |
7dd08bec MD |
840 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
841 | struct lttng_event *event) | |
8020ceb5 MD |
842 | { |
843 | const struct lttng_event_desc *desc = event->desc; | |
844 | int ret = 0; | |
845 | int i; | |
846 | ||
847 | for (i = 0; i < desc->nr_fields; i++) { | |
848 | const struct lttng_event_field *field = &desc->fields[i]; | |
849 | ||
7dd08bec | 850 | ret = _lttng_field_statedump(session, field); |
8020ceb5 MD |
851 | if (ret) |
852 | return ret; | |
853 | } | |
854 | return ret; | |
855 | } | |
856 | ||
857 | static | |
7dd08bec MD |
858 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
859 | struct lttng_channel *chan, | |
860 | struct lttng_event *event) | |
8020ceb5 MD |
861 | { |
862 | int ret = 0; | |
8155c5e8 | 863 | int loglevel = TRACE_DEFAULT; |
8020ceb5 | 864 | |
b5234c06 | 865 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
866 | return 0; |
867 | if (chan == session->metadata) | |
868 | return 0; | |
8165c8da MD |
869 | /* |
870 | * Don't print events for which probe load is pending. | |
871 | */ | |
872 | if (!event->desc) | |
873 | return 0; | |
8020ceb5 MD |
874 | |
875 | ret = lttng_metadata_printf(session, | |
876 | "event {\n" | |
7083f0fe | 877 | " name = \"%s\";\n" |
8020ceb5 MD |
878 | " id = %u;\n" |
879 | " stream_id = %u;\n", | |
880 | event->desc->name, | |
881 | event->id, | |
882 | event->chan->id); | |
883 | if (ret) | |
884 | goto end; | |
885 | ||
8155c5e8 MD |
886 | if (event->desc->loglevel) |
887 | loglevel = *(*event->desc->loglevel); | |
888 | ||
889 | ret = lttng_metadata_printf(session, | |
890 | " loglevel = %d;\n", | |
891 | loglevel); | |
892 | if (ret) | |
893 | goto end; | |
e6c12e3d | 894 | |
6ddc916d MD |
895 | if (event->desc->u.ext.model_emf_uri) { |
896 | ret = lttng_metadata_printf(session, | |
897 | " model.emf.uri = \"%s\";\n", | |
898 | *(event->desc->u.ext.model_emf_uri)); | |
899 | if (ret) | |
900 | goto end; | |
901 | } | |
902 | ||
8020ceb5 MD |
903 | if (event->ctx) { |
904 | ret = lttng_metadata_printf(session, | |
905 | " context := struct {\n"); | |
906 | if (ret) | |
907 | goto end; | |
908 | } | |
7dd08bec | 909 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8020ceb5 MD |
910 | if (ret) |
911 | goto end; | |
912 | if (event->ctx) { | |
913 | ret = lttng_metadata_printf(session, | |
914 | " };\n"); | |
915 | if (ret) | |
916 | goto end; | |
917 | } | |
918 | ||
919 | ret = lttng_metadata_printf(session, | |
920 | " fields := struct {\n" | |
921 | ); | |
922 | if (ret) | |
923 | goto end; | |
924 | ||
7dd08bec | 925 | ret = _lttng_fields_metadata_statedump(session, event); |
8020ceb5 MD |
926 | if (ret) |
927 | goto end; | |
928 | ||
929 | /* | |
930 | * LTTng space reservation can only reserve multiples of the | |
931 | * byte size. | |
932 | */ | |
933 | ret = lttng_metadata_printf(session, | |
934 | " };\n" | |
935 | "};\n\n"); | |
936 | if (ret) | |
937 | goto end; | |
938 | ||
939 | event->metadata_dumped = 1; | |
940 | end: | |
941 | return ret; | |
942 | ||
943 | } | |
944 | ||
945 | static | |
7dd08bec MD |
946 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
947 | struct lttng_channel *chan) | |
8020ceb5 MD |
948 | { |
949 | int ret = 0; | |
950 | ||
b5234c06 | 951 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
952 | return 0; |
953 | if (chan == session->metadata) | |
954 | return 0; | |
955 | ||
956 | WARN_ON_ONCE(!chan->header_type); | |
957 | ret = lttng_metadata_printf(session, | |
958 | "stream {\n" | |
959 | " id = %u;\n" | |
960 | " event.header := %s;\n" | |
961 | " packet.context := struct packet_context;\n", | |
962 | chan->id, | |
963 | chan->header_type == 1 ? "struct event_header_compact" : | |
964 | "struct event_header_large"); | |
965 | if (ret) | |
966 | goto end; | |
967 | ||
968 | if (chan->ctx) { | |
969 | ret = lttng_metadata_printf(session, | |
970 | " event.context := struct {\n"); | |
971 | if (ret) | |
972 | goto end; | |
973 | } | |
7dd08bec | 974 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8020ceb5 MD |
975 | if (ret) |
976 | goto end; | |
977 | if (chan->ctx) { | |
978 | ret = lttng_metadata_printf(session, | |
979 | " };\n"); | |
980 | if (ret) | |
981 | goto end; | |
982 | } | |
983 | ||
984 | ret = lttng_metadata_printf(session, | |
985 | "};\n\n"); | |
986 | ||
987 | chan->metadata_dumped = 1; | |
988 | end: | |
989 | return ret; | |
990 | } | |
991 | ||
992 | static | |
7dd08bec | 993 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
8020ceb5 MD |
994 | { |
995 | return lttng_metadata_printf(session, | |
996 | "struct packet_context {\n" | |
28b12049 MD |
997 | " uint64_clock_monotonic_t timestamp_begin;\n" |
998 | " uint64_clock_monotonic_t timestamp_end;\n" | |
0c00a107 MD |
999 | " uint64_t content_size;\n" |
1000 | " uint64_t packet_size;\n" | |
18fc8d71 | 1001 | " unsigned long events_discarded;\n" |
8020ceb5 MD |
1002 | " uint32_t cpu_id;\n" |
1003 | "};\n\n" | |
1004 | ); | |
1005 | } | |
1006 | ||
1007 | /* | |
1008 | * Compact header: | |
1009 | * id: range: 0 - 30. | |
1010 | * id 31 is reserved to indicate an extended header. | |
1011 | * | |
1012 | * Large header: | |
1013 | * id: range: 0 - 65534. | |
1014 | * id 65535 is reserved to indicate an extended header. | |
1015 | */ | |
1016 | static | |
7dd08bec | 1017 | int _lttng_event_header_declare(struct lttng_session *session) |
8020ceb5 MD |
1018 | { |
1019 | return lttng_metadata_printf(session, | |
1020 | "struct event_header_compact {\n" | |
1021 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1022 | " variant <id> {\n" | |
1023 | " struct {\n" | |
28b12049 | 1024 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1025 | " } compact;\n" |
1026 | " struct {\n" | |
1027 | " uint32_t id;\n" | |
28b12049 | 1028 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1029 | " } extended;\n" |
1030 | " } v;\n" | |
1031 | "} align(%u);\n" | |
1032 | "\n" | |
1033 | "struct event_header_large {\n" | |
1034 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1035 | " variant <id> {\n" | |
1036 | " struct {\n" | |
28b12049 | 1037 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1038 | " } compact;\n" |
1039 | " struct {\n" | |
1040 | " uint32_t id;\n" | |
28b12049 | 1041 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1042 | " } extended;\n" |
1043 | " } v;\n" | |
1044 | "} align(%u);\n\n", | |
1dbfff0c MD |
1045 | lttng_alignof(uint32_t) * CHAR_BIT, |
1046 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1047 | ); |
1048 | } | |
1049 | ||
28b12049 MD |
1050 | /* |
1051 | * Approximation of NTP time of day to clock monotonic correlation, | |
1052 | * taken at start of trace. | |
1053 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1054 | * in future versions. | |
1055 | */ | |
1056 | static | |
1057 | uint64_t measure_clock_offset(void) | |
1058 | { | |
1059 | uint64_t offset, monotonic[2], realtime; | |
1060 | struct timespec rts = { 0, 0 }; | |
1061 | int ret; | |
1062 | ||
1063 | monotonic[0] = trace_clock_read64(); | |
1064 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1065 | if (ret < 0) | |
1066 | return 0; | |
1067 | monotonic[1] = trace_clock_read64(); | |
1068 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
17ec046a | 1069 | realtime = (uint64_t) rts.tv_sec * 1000000000ULL; |
28b12049 MD |
1070 | realtime += rts.tv_nsec; |
1071 | offset = realtime - offset; | |
1072 | return offset; | |
1073 | } | |
1074 | ||
8020ceb5 MD |
1075 | /* |
1076 | * Output metadata into this session's metadata buffers. | |
1077 | */ | |
1078 | static | |
7dd08bec | 1079 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
8020ceb5 | 1080 | { |
b5234c06 | 1081 | unsigned char *uuid_c = session->uuid; |
19d8b1b3 MD |
1082 | char uuid_s[LTTNG_UST_UUID_STR_LEN], |
1083 | clock_uuid_s[LTTNG_UST_UUID_STR_LEN]; | |
7dd08bec MD |
1084 | struct lttng_channel *chan; |
1085 | struct lttng_event *event; | |
8020ceb5 | 1086 | int ret = 0; |
08114193 | 1087 | char procname[LTTNG_UST_PROCNAME_LEN] = ""; |
9e4d42a0 | 1088 | char hostname[HOST_NAME_MAX]; |
8020ceb5 | 1089 | |
b5234c06 | 1090 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1091 | return 0; |
1092 | if (session->metadata_dumped) | |
1093 | goto skip_session; | |
1094 | if (!session->metadata) { | |
b5234c06 | 1095 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1096 | return -EPERM; |
1097 | } | |
1098 | ||
1099 | snprintf(uuid_s, sizeof(uuid_s), | |
1100 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1101 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1102 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1103 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1104 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1105 | ||
1106 | ret = lttng_metadata_printf(session, | |
1107 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1108 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1109 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1110 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
18fc8d71 | 1111 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
8020ceb5 MD |
1112 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
1113 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1114 | "\n" | |
1115 | "trace {\n" | |
1116 | " major = %u;\n" | |
1117 | " minor = %u;\n" | |
1118 | " uuid = \"%s\";\n" | |
1119 | " byte_order = %s;\n" | |
1120 | " packet.header := struct {\n" | |
1121 | " uint32_t magic;\n" | |
1122 | " uint8_t uuid[16];\n" | |
1123 | " uint32_t stream_id;\n" | |
1124 | " };\n" | |
1125 | "};\n\n", | |
1dbfff0c MD |
1126 | lttng_alignof(uint8_t) * CHAR_BIT, |
1127 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1128 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1129 | lttng_alignof(uint64_t) * CHAR_BIT, | |
18fc8d71 MD |
1130 | sizeof(unsigned long) * CHAR_BIT, |
1131 | lttng_alignof(unsigned long) * CHAR_BIT, | |
2694975d MD |
1132 | CTF_SPEC_MAJOR, |
1133 | CTF_SPEC_MINOR, | |
8020ceb5 | 1134 | uuid_s, |
8a98a75d | 1135 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1136 | "be" |
1137 | #else | |
1138 | "le" | |
1139 | #endif | |
1140 | ); | |
1141 | if (ret) | |
1142 | goto end; | |
1143 | ||
b020e504 | 1144 | /* ignore error, just use empty string if error. */ |
9e4d42a0 MD |
1145 | hostname[0] = '\0'; |
1146 | ret = gethostname(hostname, sizeof(hostname)); | |
1147 | if (ret && errno == ENAMETOOLONG) | |
1148 | hostname[HOST_NAME_MAX - 1] = '\0'; | |
08114193 MD |
1149 | lttng_ust_getprocname(procname); |
1150 | procname[LTTNG_UST_PROCNAME_LEN - 1] = '\0'; | |
b020e504 MD |
1151 | ret = lttng_metadata_printf(session, |
1152 | "env {\n" | |
9e4d42a0 | 1153 | " hostname = \"%s\";\n" |
b020e504 MD |
1154 | " vpid = %d;\n" |
1155 | " procname = \"%s\";\n" | |
2694975d MD |
1156 | " domain = \"ust\";\n" |
1157 | " tracer_name = \"lttng-ust\";\n" | |
1158 | " tracer_major = %u;\n" | |
1159 | " tracer_minor = %u;\n" | |
1160 | " tracer_patchlevel = %u;\n" | |
b020e504 | 1161 | "};\n\n", |
9e4d42a0 | 1162 | hostname, |
b020e504 MD |
1163 | (int) getpid(), |
1164 | procname, | |
2694975d MD |
1165 | LTTNG_UST_MAJOR_VERSION, |
1166 | LTTNG_UST_MINOR_VERSION, | |
1167 | LTTNG_UST_PATCHLEVEL_VERSION | |
b020e504 MD |
1168 | ); |
1169 | if (ret) | |
1170 | goto end; | |
1171 | ||
28b12049 MD |
1172 | ret = lttng_metadata_printf(session, |
1173 | "clock {\n" | |
939950af MD |
1174 | " name = %s;\n", |
1175 | "monotonic" | |
1176 | ); | |
1177 | if (ret) | |
1178 | goto end; | |
1179 | ||
1180 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1181 | ret = lttng_metadata_printf(session, | |
1182 | " uuid = \"%s\";\n", | |
1183 | clock_uuid_s | |
1184 | ); | |
1185 | if (ret) | |
1186 | goto end; | |
1187 | } | |
1188 | ||
1189 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1190 | " description = \"Monotonic Clock\";\n" |
1191 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1192 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1193 | " offset = %" PRIu64 ";\n" | |
1194 | "};\n\n", | |
28b12049 MD |
1195 | trace_clock_freq(), |
1196 | measure_clock_offset() | |
1197 | ); | |
1198 | if (ret) | |
1199 | goto end; | |
1200 | ||
1201 | ret = lttng_metadata_printf(session, | |
1202 | "typealias integer {\n" | |
1203 | " size = 27; align = 1; signed = false;\n" | |
1204 | " map = clock.monotonic.value;\n" | |
1205 | "} := uint27_clock_monotonic_t;\n" | |
1206 | "\n" | |
1207 | "typealias integer {\n" | |
1208 | " size = 32; align = %u; signed = false;\n" | |
1209 | " map = clock.monotonic.value;\n" | |
1210 | "} := uint32_clock_monotonic_t;\n" | |
1211 | "\n" | |
1212 | "typealias integer {\n" | |
1213 | " size = 64; align = %u; signed = false;\n" | |
1214 | " map = clock.monotonic.value;\n" | |
1215 | "} := uint64_clock_monotonic_t;\n\n", | |
1216 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1217 | lttng_alignof(uint64_t) * CHAR_BIT | |
1218 | ); | |
1219 | if (ret) | |
1220 | goto end; | |
1221 | ||
7dd08bec | 1222 | ret = _lttng_stream_packet_context_declare(session); |
8020ceb5 MD |
1223 | if (ret) |
1224 | goto end; | |
1225 | ||
7dd08bec | 1226 | ret = _lttng_event_header_declare(session); |
8020ceb5 MD |
1227 | if (ret) |
1228 | goto end; | |
1229 | ||
1230 | skip_session: | |
e58095ef | 1231 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
7dd08bec | 1232 | ret = _lttng_channel_metadata_statedump(session, chan); |
8020ceb5 MD |
1233 | if (ret) |
1234 | goto end; | |
1235 | } | |
1236 | ||
e58095ef | 1237 | cds_list_for_each_entry(event, &session->events_head, node) { |
7dd08bec | 1238 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
8020ceb5 MD |
1239 | if (ret) |
1240 | goto end; | |
1241 | } | |
1242 | session->metadata_dumped = 1; | |
1243 | end: | |
1244 | return ret; | |
1245 | } | |
1246 | ||
003fedf4 | 1247 | void lttng_ust_events_exit(void) |
8020ceb5 | 1248 | { |
7dd08bec | 1249 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1250 | |
e58095ef | 1251 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1252 | lttng_session_destroy(session); |
8020ceb5 | 1253 | } |
457a6b58 | 1254 | |
e58095ef MD |
1255 | /* |
1256 | * Enabler management. | |
1257 | */ | |
1258 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1259 | struct lttng_ust_event *event_param, | |
1260 | struct lttng_channel *chan) | |
457a6b58 | 1261 | { |
e58095ef MD |
1262 | struct lttng_enabler *enabler; |
1263 | ||
1264 | enabler = zmalloc(sizeof(*enabler)); | |
1265 | if (!enabler) | |
1266 | return NULL; | |
1267 | enabler->type = type; | |
1268 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
1269 | memcpy(&enabler->event_param, event_param, | |
1270 | sizeof(enabler->event_param)); | |
1271 | enabler->chan = chan; | |
1272 | /* ctx left NULL */ | |
1273 | enabler->enabled = 1; | |
1274 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1275 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1276 | return enabler; | |
457a6b58 MD |
1277 | } |
1278 | ||
e58095ef | 1279 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 1280 | { |
e58095ef MD |
1281 | enabler->enabled = 1; |
1282 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1283 | return 0; | |
457a6b58 | 1284 | } |
457a6b58 | 1285 | |
e58095ef | 1286 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 1287 | { |
e58095ef MD |
1288 | if (enabler->chan == enabler->chan->session->metadata) |
1289 | return -EPERM; | |
1290 | enabler->enabled = 0; | |
1291 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1292 | return 0; | |
1293 | } | |
457a6b58 | 1294 | |
e58095ef MD |
1295 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1296 | struct lttng_ust_filter_bytecode_node *bytecode) | |
1297 | { | |
1298 | bytecode->enabler = enabler; | |
1299 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
1300 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1301 | return 0; | |
1302 | } | |
f488575f | 1303 | |
e58095ef MD |
1304 | int lttng_attach_context(struct lttng_ust_context *context_param, |
1305 | struct lttng_ctx **ctx, struct lttng_session *session) | |
1306 | { | |
457a6b58 | 1307 | /* |
e58095ef MD |
1308 | * We cannot attach a context after trace has been started for a |
1309 | * session because the metadata does not allow expressing this | |
1310 | * information outside of the original channel scope. | |
457a6b58 | 1311 | */ |
e58095ef MD |
1312 | if (session->been_active) |
1313 | return -EPERM; | |
457a6b58 | 1314 | |
e58095ef MD |
1315 | switch (context_param->ctx) { |
1316 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1317 | return lttng_add_pthread_id_to_ctx(ctx); | |
1318 | case LTTNG_UST_CONTEXT_VTID: | |
1319 | return lttng_add_vtid_to_ctx(ctx); | |
1320 | case LTTNG_UST_CONTEXT_VPID: | |
1321 | return lttng_add_vpid_to_ctx(ctx); | |
1322 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1323 | return lttng_add_procname_to_ctx(ctx); | |
1324 | default: | |
1325 | return -EINVAL; | |
457a6b58 | 1326 | } |
457a6b58 MD |
1327 | } |
1328 | ||
e58095ef MD |
1329 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1330 | struct lttng_ust_context *context_param) | |
457a6b58 | 1331 | { |
e58095ef MD |
1332 | #if 0 // disabled for now. |
1333 | struct lttng_session *session = enabler->chan->session; | |
1334 | int ret; | |
457a6b58 | 1335 | |
e58095ef MD |
1336 | ret = lttng_attach_context(context_param, &enabler->ctx, |
1337 | session); | |
1338 | if (ret) | |
1339 | return ret; | |
1340 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1341 | #endif | |
1342 | return -ENOSYS; | |
457a6b58 MD |
1343 | } |
1344 | ||
e58095ef MD |
1345 | static |
1346 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 1347 | { |
e58095ef | 1348 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
457a6b58 | 1349 | |
e58095ef MD |
1350 | /* Destroy filter bytecode */ |
1351 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1352 | &enabler->filter_bytecode_head, node) { | |
1353 | free(filter_node); | |
457a6b58 | 1354 | } |
e58095ef MD |
1355 | |
1356 | /* Destroy contexts */ | |
1357 | lttng_destroy_context(enabler->ctx); | |
1358 | ||
1359 | cds_list_del(&enabler->node); | |
1360 | free(enabler); | |
457a6b58 MD |
1361 | } |
1362 | ||
e58095ef MD |
1363 | /* |
1364 | * lttng_session_sync_enablers should be called just before starting a | |
1365 | * session. | |
1366 | */ | |
457a6b58 | 1367 | static |
e58095ef | 1368 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 1369 | { |
e58095ef MD |
1370 | struct lttng_enabler *enabler; |
1371 | struct lttng_event *event; | |
457a6b58 | 1372 | |
e58095ef MD |
1373 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
1374 | lttng_enabler_ref_events(enabler); | |
1375 | /* | |
1376 | * For each event, if at least one of its enablers is enabled, | |
1377 | * we enable the event, else we disable it. | |
1378 | */ | |
1379 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1380 | struct lttng_enabler_ref *enabler_ref; | |
1381 | struct lttng_bytecode_runtime *runtime; | |
1382 | int enabled = 0; | |
1383 | ||
1384 | /* Enable events */ | |
1385 | cds_list_for_each_entry(enabler_ref, | |
1386 | &event->enablers_ref_head, node) { | |
1387 | if (enabler_ref->ref->enabled) { | |
1388 | enabled = 1; | |
1389 | break; | |
1390 | } | |
1391 | } | |
1392 | event->enabled = enabled; | |
457a6b58 | 1393 | |
e58095ef MD |
1394 | /* Enable filters */ |
1395 | cds_list_for_each_entry(runtime, | |
1396 | &event->bytecode_runtime_head, node) { | |
1397 | lttng_filter_sync_state(runtime); | |
457a6b58 | 1398 | } |
e58095ef | 1399 | |
457a6b58 | 1400 | } |
457a6b58 MD |
1401 | } |
1402 | ||
e58095ef MD |
1403 | /* |
1404 | * Apply enablers to session events, adding events to session if need | |
1405 | * be. It is required after each modification applied to an active | |
1406 | * session, and right before session "start". | |
1407 | * "lazy" sync means we only sync if required. | |
1408 | */ | |
1409 | static | |
1410 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 1411 | { |
e58095ef MD |
1412 | /* We can skip if session is not active */ |
1413 | if (!session->active) | |
1414 | return; | |
1415 | lttng_session_sync_enablers(session); | |
457a6b58 | 1416 | } |
eddd8d5d MD |
1417 | |
1418 | /* | |
1419 | * Take the TLS "fault" in libuuid if dlopen'd, which can take the | |
1420 | * dynamic linker mutex, outside of the UST lock, since the UST lock is | |
1421 | * taken in constructors, which are called with dynamic linker mutex | |
1422 | * held. | |
1423 | */ | |
1424 | void lttng_fixup_event_tls(void) | |
1425 | { | |
60c089cf | 1426 | unsigned char uuid[LTTNG_UST_UUID_STR_LEN]; |
eddd8d5d | 1427 | |
60c089cf | 1428 | (void) lttng_ust_uuid_generate(uuid); |
eddd8d5d | 1429 | } |