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> | |
32ce8569 MD |
48 | #include <ust-ctl.h> |
49 | #include <ust-comm.h> | |
1f18504e | 50 | #include "error.h" |
08114193 | 51 | #include "compat.h" |
eda498b8 | 52 | #include "lttng-ust-uuid.h" |
44c72f10 | 53 | |
457a6b58 | 54 | #include "tracepoint-internal.h" |
7dd08bec MD |
55 | #include "lttng-tracer.h" |
56 | #include "lttng-tracer-core.h" | |
b728d87e | 57 | #include "wait.h" |
8d8a24c8 | 58 | #include "../libringbuffer/shm.h" |
596c4223 | 59 | #include "jhash.h" |
8165c8da MD |
60 | |
61 | /* | |
62 | * The sessions mutex is the centralized mutex across UST tracing | |
17dfb34b MD |
63 | * control and probe registration. All operations within this file are |
64 | * called by the communication thread, under ust_lock protection. | |
8165c8da | 65 | */ |
2b2d6ff7 | 66 | static pthread_mutex_t sessions_mutex = PTHREAD_MUTEX_INITIALIZER; |
8165c8da | 67 | |
17dfb34b | 68 | void ust_lock(void) |
8165c8da MD |
69 | { |
70 | pthread_mutex_lock(&sessions_mutex); | |
71 | } | |
72 | ||
17dfb34b | 73 | void ust_unlock(void) |
8165c8da MD |
74 | { |
75 | pthread_mutex_unlock(&sessions_mutex); | |
76 | } | |
77 | ||
b5234c06 | 78 | static CDS_LIST_HEAD(sessions); |
8165c8da | 79 | |
7dd08bec | 80 | static void _lttng_event_destroy(struct lttng_event *event); |
7dd08bec | 81 | static int _lttng_event_unregister(struct lttng_event *event); |
8020ceb5 | 82 | static |
7dd08bec MD |
83 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
84 | struct lttng_channel *chan, | |
85 | struct lttng_event *event); | |
8020ceb5 | 86 | static |
7dd08bec | 87 | int _lttng_session_metadata_statedump(struct lttng_session *session); |
8020ceb5 | 88 | |
e58095ef MD |
89 | static |
90 | void lttng_session_lazy_sync_enablers(struct lttng_session *session); | |
91 | static | |
92 | void lttng_session_sync_enablers(struct lttng_session *session); | |
93 | static | |
94 | void lttng_enabler_destroy(struct lttng_enabler *enabler); | |
95 | ||
6715d7d1 MD |
96 | /* |
97 | * Called with ust lock held. | |
98 | */ | |
99 | int lttng_session_active(void) | |
100 | { | |
101 | struct lttng_session *iter; | |
102 | ||
103 | cds_list_for_each_entry(iter, &sessions, node) { | |
104 | if (iter->active) | |
105 | return 1; | |
106 | } | |
107 | return 0; | |
108 | } | |
109 | ||
e58095ef MD |
110 | static |
111 | int lttng_loglevel_match(int loglevel, | |
112 | unsigned int has_loglevel, | |
457a6b58 MD |
113 | enum lttng_ust_loglevel_type req_type, |
114 | int req_loglevel) | |
115 | { | |
457a6b58 MD |
116 | if (req_type == LTTNG_UST_LOGLEVEL_ALL) |
117 | return 1; | |
e58095ef MD |
118 | if (!has_loglevel) |
119 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
120 | switch (req_type) { |
121 | case LTTNG_UST_LOGLEVEL_RANGE: | |
e58095ef | 122 | if (loglevel <= req_loglevel || req_loglevel == -1) |
457a6b58 MD |
123 | return 1; |
124 | else | |
125 | return 0; | |
126 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
e58095ef | 127 | if (loglevel == req_loglevel || req_loglevel == -1) |
457a6b58 MD |
128 | return 1; |
129 | else | |
130 | return 0; | |
131 | case LTTNG_UST_LOGLEVEL_ALL: | |
132 | default: | |
133 | return 1; | |
134 | } | |
135 | } | |
136 | ||
8020ceb5 MD |
137 | void synchronize_trace(void) |
138 | { | |
8020ceb5 | 139 | synchronize_rcu(); |
8020ceb5 MD |
140 | } |
141 | ||
7dd08bec | 142 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 143 | { |
7dd08bec | 144 | struct lttng_session *session; |
74d81a6c | 145 | int i; |
8020ceb5 | 146 | |
7dd08bec | 147 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
148 | if (!session) |
149 | return NULL; | |
e58095ef MD |
150 | CDS_INIT_LIST_HEAD(&session->chan_head); |
151 | CDS_INIT_LIST_HEAD(&session->events_head); | |
152 | CDS_INIT_LIST_HEAD(&session->enablers_head); | |
d56fa719 MD |
153 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
154 | CDS_INIT_HLIST_HEAD(&session->events_ht.table[i]); | |
e58095ef | 155 | cds_list_add(&session->node, &sessions); |
8020ceb5 MD |
156 | return session; |
157 | } | |
158 | ||
74d81a6c MD |
159 | /* |
160 | * Only used internally at session destruction. | |
161 | */ | |
162 | static | |
163 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
164 | { | |
165 | struct channel *chan; | |
166 | struct lttng_ust_shm_handle *handle; | |
167 | ||
168 | cds_list_del(<tng_chan->node); | |
169 | lttng_destroy_context(lttng_chan->ctx); | |
170 | chan = lttng_chan->chan; | |
171 | handle = lttng_chan->handle; | |
172 | /* | |
173 | * note: lttng_chan is private data contained within handle. It | |
174 | * will be freed along with the handle. | |
175 | */ | |
176 | channel_destroy(chan, handle, 0); | |
177 | } | |
178 | ||
7dd08bec | 179 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 180 | { |
7dd08bec MD |
181 | struct lttng_channel *chan, *tmpchan; |
182 | struct lttng_event *event, *tmpevent; | |
e58095ef | 183 | struct lttng_enabler *enabler, *tmpenabler; |
8020ceb5 MD |
184 | int ret; |
185 | ||
b5234c06 | 186 | CMM_ACCESS_ONCE(session->active) = 0; |
e58095ef | 187 | cds_list_for_each_entry(event, &session->events_head, node) { |
7dd08bec | 188 | ret = _lttng_event_unregister(event); |
8020ceb5 MD |
189 | WARN_ON(ret); |
190 | } | |
191 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e58095ef MD |
192 | cds_list_for_each_entry_safe(enabler, tmpenabler, |
193 | &session->enablers_head, node) | |
194 | lttng_enabler_destroy(enabler); | |
195 | cds_list_for_each_entry_safe(event, tmpevent, | |
196 | &session->events_head, node) | |
7dd08bec | 197 | _lttng_event_destroy(event); |
e58095ef | 198 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan_head, node) |
74d81a6c | 199 | _lttng_channel_unmap(chan); |
e58095ef | 200 | cds_list_del(&session->node); |
b5234c06 | 201 | free(session); |
8020ceb5 MD |
202 | } |
203 | ||
7dd08bec | 204 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
205 | { |
206 | int ret = 0; | |
7dd08bec | 207 | struct lttng_channel *chan; |
32ce8569 | 208 | int notify_socket; |
8020ceb5 | 209 | |
8020ceb5 MD |
210 | if (session->active) { |
211 | ret = -EBUSY; | |
212 | goto end; | |
213 | } | |
214 | ||
32ce8569 MD |
215 | notify_socket = lttng_get_notify_socket(session->owner); |
216 | if (notify_socket < 0) | |
217 | return notify_socket; | |
218 | ||
e58095ef MD |
219 | /* We need to sync enablers with session before activation. */ |
220 | lttng_session_sync_enablers(session); | |
221 | ||
8020ceb5 MD |
222 | /* |
223 | * Snapshot the number of events per channel to know the type of header | |
224 | * we need to use. | |
225 | */ | |
e58095ef | 226 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
32ce8569 MD |
227 | const struct lttng_ctx *ctx; |
228 | const struct lttng_event_field *fields = NULL; | |
229 | size_t nr_fields = 0; | |
230 | ||
231 | /* don't change it if session stop/restart */ | |
8020ceb5 | 232 | if (chan->header_type) |
32ce8569 MD |
233 | continue; |
234 | ctx = chan->ctx; | |
235 | if (ctx) { | |
236 | nr_fields = ctx->nr_fields; | |
237 | fields = &ctx->fields->event_field; | |
238 | } | |
239 | ret = ustcomm_register_channel(notify_socket, | |
240 | session->objd, | |
241 | chan->objd, | |
242 | nr_fields, | |
243 | fields, | |
244 | &chan->id, | |
245 | &chan->header_type); | |
246 | if (ret) | |
247 | return ret; | |
8020ceb5 MD |
248 | } |
249 | ||
b5234c06 MD |
250 | CMM_ACCESS_ONCE(session->active) = 1; |
251 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
8020ceb5 | 252 | end: |
8020ceb5 MD |
253 | return ret; |
254 | } | |
255 | ||
7dd08bec | 256 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
257 | { |
258 | int ret = 0; | |
259 | ||
8020ceb5 MD |
260 | if (!session->active) { |
261 | ret = -EBUSY; | |
262 | goto end; | |
263 | } | |
b5234c06 | 264 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 265 | end: |
8020ceb5 MD |
266 | return ret; |
267 | } | |
268 | ||
7dd08bec | 269 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea MD |
270 | { |
271 | int old; | |
272 | ||
9beb36ba MD |
273 | if (channel == channel->session->metadata) |
274 | return -EPERM; | |
b5234c06 | 275 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
276 | if (old) |
277 | return -EEXIST; | |
278 | return 0; | |
279 | } | |
280 | ||
7dd08bec | 281 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea MD |
282 | { |
283 | int old; | |
284 | ||
9beb36ba MD |
285 | if (channel == channel->session->metadata) |
286 | return -EPERM; | |
b5234c06 | 287 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
288 | if (!old) |
289 | return -EEXIST; | |
290 | return 0; | |
291 | } | |
292 | ||
7dd08bec | 293 | int lttng_event_enable(struct lttng_event *event) |
976fe9ea MD |
294 | { |
295 | int old; | |
296 | ||
9beb36ba MD |
297 | if (event->chan == event->chan->session->metadata) |
298 | return -EPERM; | |
b5234c06 | 299 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
300 | if (old) |
301 | return -EEXIST; | |
302 | return 0; | |
303 | } | |
304 | ||
7dd08bec | 305 | int lttng_event_disable(struct lttng_event *event) |
976fe9ea MD |
306 | { |
307 | int old; | |
308 | ||
9beb36ba MD |
309 | if (event->chan == event->chan->session->metadata) |
310 | return -EPERM; | |
b5234c06 | 311 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
312 | if (!old) |
313 | return -EEXIST; | |
314 | return 0; | |
315 | } | |
316 | ||
8020ceb5 MD |
317 | /* |
318 | * Supports event creation while tracing session is active. | |
319 | */ | |
e58095ef MD |
320 | static |
321 | int lttng_event_create(const struct lttng_event_desc *desc, | |
322 | struct lttng_channel *chan) | |
8020ceb5 | 323 | { |
e58095ef | 324 | const char *event_name = desc->name; |
7dd08bec | 325 | struct lttng_event *event; |
32ce8569 | 326 | struct lttng_session *session = chan->session; |
d56fa719 MD |
327 | struct cds_hlist_head *head; |
328 | struct cds_hlist_node *node; | |
576599a0 | 329 | int ret = 0; |
d56fa719 MD |
330 | size_t name_len = strlen(event_name); |
331 | uint32_t hash; | |
32ce8569 MD |
332 | int notify_socket, loglevel; |
333 | const char *uri; | |
8020ceb5 | 334 | |
d56fa719 MD |
335 | hash = jhash(event_name, name_len, 0); |
336 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
337 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef MD |
338 | assert(event->desc); |
339 | if (!strncmp(event->desc->name, | |
340 | desc->name, | |
ff412fb5 | 341 | LTTNG_UST_SYM_NAME_LEN - 1)) { |
576599a0 | 342 | ret = -EEXIST; |
8020ceb5 | 343 | goto exist; |
576599a0 MD |
344 | } |
345 | } | |
457a6b58 | 346 | |
32ce8569 MD |
347 | notify_socket = lttng_get_notify_socket(session->owner); |
348 | if (notify_socket < 0) { | |
349 | ret = notify_socket; | |
350 | goto socket_error; | |
351 | } | |
352 | ||
457a6b58 MD |
353 | /* |
354 | * Check if loglevel match. Refuse to connect event if not. | |
355 | */ | |
7dd08bec | 356 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
357 | if (!event) { |
358 | ret = -ENOMEM; | |
8020ceb5 | 359 | goto cache_error; |
576599a0 | 360 | } |
8020ceb5 | 361 | event->chan = chan; |
e58095ef | 362 | |
976fe9ea | 363 | event->enabled = 1; |
e58095ef MD |
364 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
365 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
366 | event->desc = desc; | |
32ce8569 MD |
367 | |
368 | if (desc->loglevel) | |
369 | loglevel = *(*event->desc->loglevel); | |
370 | else | |
371 | loglevel = TRACE_DEFAULT; | |
372 | if (desc->u.ext.model_emf_uri) | |
373 | uri = *(desc->u.ext.model_emf_uri); | |
374 | else | |
375 | uri = NULL; | |
376 | ||
2b213b16 MD |
377 | /* Don't register metadata events */ |
378 | if (session->metadata == chan) { | |
379 | event->id = -1U; | |
380 | } else { | |
381 | /* Fetch event ID from sessiond */ | |
382 | ret = ustcomm_register_event(notify_socket, | |
383 | session->objd, | |
384 | chan->objd, | |
385 | event_name, | |
386 | loglevel, | |
387 | desc->signature, | |
388 | desc->nr_fields, | |
389 | desc->fields, | |
390 | uri, | |
391 | &event->id); | |
392 | if (ret < 0) { | |
393 | goto sessiond_register_error; | |
394 | } | |
32ce8569 | 395 | } |
2b213b16 | 396 | |
7dd08bec | 397 | /* Populate lttng_event structure before tracepoint registration. */ |
b5234c06 | 398 | cmm_smp_wmb(); |
e58095ef MD |
399 | ret = __tracepoint_probe_register(event_name, |
400 | desc->probe_callback, | |
401 | event, desc->signature); | |
402 | if (ret) | |
32ce8569 MD |
403 | goto tracepoint_register_error; |
404 | ||
e58095ef | 405 | cds_list_add(&event->node, &chan->session->events_head); |
d56fa719 | 406 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 407 | return 0; |
8020ceb5 | 408 | |
32ce8569 MD |
409 | tracepoint_register_error: |
410 | sessiond_register_error: | |
b5234c06 | 411 | free(event); |
8020ceb5 | 412 | cache_error: |
32ce8569 | 413 | socket_error: |
8020ceb5 | 414 | exist: |
576599a0 | 415 | return ret; |
8020ceb5 MD |
416 | } |
417 | ||
e58095ef MD |
418 | static |
419 | int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, | |
420 | struct lttng_enabler *enabler) | |
421 | { | |
422 | int loglevel = 0; | |
423 | unsigned int has_loglevel; | |
424 | ||
425 | assert(enabler->type == LTTNG_ENABLER_WILDCARD); | |
426 | /* Compare excluding final '*' */ | |
427 | if (strncmp(desc->name, enabler->event_param.name, | |
428 | strlen(enabler->event_param.name) - 1)) | |
429 | return 0; | |
430 | if (desc->loglevel) { | |
431 | loglevel = *(*desc->loglevel); | |
432 | has_loglevel = 1; | |
433 | } | |
434 | if (!lttng_loglevel_match(loglevel, | |
435 | has_loglevel, | |
436 | enabler->event_param.loglevel_type, | |
437 | enabler->event_param.loglevel)) | |
438 | return 0; | |
439 | return 1; | |
440 | } | |
441 | ||
442 | static | |
443 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
444 | struct lttng_enabler *enabler) | |
445 | { | |
446 | int loglevel = 0; | |
447 | unsigned int has_loglevel = 0; | |
448 | ||
449 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
450 | if (strcmp(desc->name, enabler->event_param.name)) | |
451 | return 0; | |
452 | if (desc->loglevel) { | |
453 | loglevel = *(*desc->loglevel); | |
454 | has_loglevel = 1; | |
455 | } | |
456 | if (!lttng_loglevel_match(loglevel, | |
457 | has_loglevel, | |
458 | enabler->event_param.loglevel_type, | |
459 | enabler->event_param.loglevel)) | |
460 | return 0; | |
461 | return 1; | |
462 | } | |
463 | ||
464 | static | |
465 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
466 | struct lttng_enabler *enabler) | |
467 | { | |
468 | switch (enabler->type) { | |
469 | case LTTNG_ENABLER_WILDCARD: | |
470 | return lttng_desc_match_wildcard_enabler(desc, enabler); | |
471 | case LTTNG_ENABLER_EVENT: | |
472 | return lttng_desc_match_event_enabler(desc, enabler); | |
473 | default: | |
474 | return -EINVAL; | |
475 | } | |
476 | } | |
477 | ||
478 | static | |
479 | int lttng_event_match_enabler(struct lttng_event *event, | |
480 | struct lttng_enabler *enabler) | |
481 | { | |
482 | return lttng_desc_match_enabler(event->desc, enabler); | |
483 | } | |
484 | ||
485 | static | |
486 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
487 | struct lttng_enabler *enabler) | |
488 | { | |
489 | struct lttng_enabler_ref *enabler_ref; | |
490 | ||
491 | cds_list_for_each_entry(enabler_ref, | |
492 | &event->enablers_ref_head, node) { | |
493 | if (enabler_ref->ref == enabler) | |
494 | return enabler_ref; | |
495 | } | |
496 | return NULL; | |
497 | } | |
498 | ||
8020ceb5 | 499 | /* |
e58095ef MD |
500 | * Create struct lttng_event if it is missing and present in the list of |
501 | * tracepoint probes. | |
8020ceb5 | 502 | */ |
e58095ef MD |
503 | static |
504 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 505 | { |
e58095ef MD |
506 | struct lttng_session *session = enabler->chan->session; |
507 | struct lttng_probe_desc *probe_desc; | |
508 | const struct lttng_event_desc *desc; | |
509 | struct lttng_event *event; | |
510 | int i; | |
511 | struct cds_list_head *probe_list; | |
512 | ||
513 | probe_list = lttng_get_probe_list_head(); | |
514 | /* | |
515 | * For each probe event, if we find that a probe event matches | |
516 | * our enabler, create an associated lttng_event if not | |
517 | * already present. | |
518 | */ | |
519 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
520 | for (i = 0; i < probe_desc->nr_events; i++) { | |
521 | int found = 0, ret; | |
d56fa719 MD |
522 | struct cds_hlist_head *head; |
523 | struct cds_hlist_node *node; | |
524 | const char *event_name; | |
525 | size_t name_len; | |
526 | uint32_t hash; | |
e58095ef MD |
527 | |
528 | desc = probe_desc->event_desc[i]; | |
529 | if (!lttng_desc_match_enabler(desc, enabler)) | |
530 | continue; | |
d56fa719 MD |
531 | event_name = desc->name; |
532 | name_len = strlen(event_name); | |
e58095ef MD |
533 | |
534 | /* | |
d56fa719 | 535 | * Check if already created. |
e58095ef | 536 | */ |
d56fa719 MD |
537 | hash = jhash(event_name, name_len, 0); |
538 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
539 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef MD |
540 | if (event->desc == desc) |
541 | found = 1; | |
542 | } | |
543 | if (found) | |
544 | continue; | |
545 | ||
546 | /* | |
547 | * We need to create an event for this | |
548 | * event probe. | |
549 | */ | |
550 | ret = lttng_event_create(probe_desc->event_desc[i], | |
551 | enabler->chan); | |
552 | if (ret) { | |
32ce8569 MD |
553 | DBG("Unable to create event %s, error %d\n", |
554 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 555 | } |
8165c8da | 556 | } |
8020ceb5 | 557 | } |
8020ceb5 MD |
558 | } |
559 | ||
560 | /* | |
e58095ef MD |
561 | * Create events associated with an enabler (if not already present), |
562 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
563 | */ |
564 | static | |
e58095ef | 565 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 566 | { |
e58095ef MD |
567 | struct lttng_session *session = enabler->chan->session; |
568 | struct lttng_event *event; | |
569 | ||
570 | /* First ensure that probe events are created for this enabler. */ | |
571 | lttng_create_event_if_missing(enabler); | |
572 | ||
573 | /* For each event matching enabler in session event list. */ | |
574 | cds_list_for_each_entry(event, &session->events_head, node) { | |
575 | struct lttng_enabler_ref *enabler_ref; | |
576 | ||
577 | if (!lttng_event_match_enabler(event, enabler)) | |
578 | continue; | |
579 | ||
580 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
581 | if (!enabler_ref) { | |
582 | /* | |
583 | * If no backward ref, create it. | |
584 | * Add backward ref from event to enabler. | |
585 | */ | |
586 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
587 | if (!enabler_ref) | |
588 | return -ENOMEM; | |
589 | enabler_ref->ref = enabler; | |
590 | cds_list_add(&enabler_ref->node, | |
591 | &event->enablers_ref_head); | |
8165c8da | 592 | } |
e58095ef MD |
593 | |
594 | /* | |
595 | * Link filter bytecodes if not linked yet. | |
596 | */ | |
597 | lttng_enabler_event_link_bytecode(event, enabler); | |
598 | ||
599 | /* TODO: merge event context. */ | |
600 | } | |
601 | return 0; | |
602 | } | |
603 | ||
604 | /* | |
605 | * Called at library load: connect the probe on all enablers matching | |
606 | * this event. | |
607 | * called with session mutex held. | |
608 | * TODO: currently, for each desc added, we iterate on all event desc | |
609 | * (inefficient). We should create specific code that only target the | |
610 | * added desc. | |
611 | */ | |
612 | int lttng_fix_pending_event_desc(const struct lttng_event_desc *desc) | |
613 | { | |
614 | struct lttng_session *session; | |
615 | ||
616 | cds_list_for_each_entry(session, &sessions, node) { | |
617 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 618 | } |
e58095ef MD |
619 | return 0; |
620 | } | |
621 | ||
622 | /* | |
623 | * Only used internally at session destruction. | |
624 | */ | |
625 | int _lttng_event_unregister(struct lttng_event *event) | |
626 | { | |
627 | return __tracepoint_probe_unregister(event->desc->name, | |
628 | event->desc->probe_callback, | |
629 | event); | |
630 | } | |
631 | ||
632 | /* | |
633 | * Only used internally at session destruction. | |
634 | */ | |
635 | static | |
636 | void _lttng_event_destroy(struct lttng_event *event) | |
637 | { | |
638 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
639 | ||
e58095ef | 640 | cds_list_del(&event->node); |
8020ceb5 | 641 | lttng_destroy_context(event->ctx); |
f488575f | 642 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
643 | /* Free event enabler refs */ |
644 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
645 | &event->enablers_ref_head, node) | |
646 | free(enabler_ref); | |
b5234c06 | 647 | free(event); |
8020ceb5 MD |
648 | } |
649 | ||
650 | /* | |
651 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 652 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
653 | * remaining space left in packet and write, since mutual exclusion |
654 | * protects us from concurrent writes. | |
655 | */ | |
7dd08bec | 656 | int lttng_metadata_printf(struct lttng_session *session, |
8020ceb5 MD |
657 | const char *fmt, ...) |
658 | { | |
4cfec15c | 659 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
7dd08bec | 660 | struct lttng_channel *chan = session->metadata; |
b5234c06 | 661 | char *str = NULL; |
8020ceb5 MD |
662 | int ret = 0, waitret; |
663 | size_t len, reserve_len, pos; | |
664 | va_list ap; | |
665 | ||
b5234c06 | 666 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
667 | |
668 | va_start(ap, fmt); | |
b5234c06 | 669 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 670 | va_end(ap); |
b5234c06 | 671 | if (ret < 0) |
8020ceb5 MD |
672 | return -ENOMEM; |
673 | ||
674 | len = strlen(str); | |
675 | pos = 0; | |
676 | ||
677 | for (pos = 0; pos < len; pos += reserve_len) { | |
678 | reserve_len = min_t(size_t, | |
1d498196 | 679 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
680 | len - pos); |
681 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 682 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
683 | /* |
684 | * We don't care about metadata buffer's records lost | |
685 | * count, because we always retry here. Report error if | |
686 | * we need to bail out after timeout or being | |
687 | * interrupted. | |
688 | */ | |
b5234c06 | 689 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
690 | ({ |
691 | ret = chan->ops->event_reserve(&ctx, 0); | |
692 | ret != -ENOBUFS || !ret; | |
693 | }), | |
b5234c06 | 694 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 695 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
696 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
697 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 698 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 699 | if (waitret == -EINTR) |
8020ceb5 MD |
700 | ret = waitret; |
701 | goto end; | |
702 | } | |
703 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
704 | chan->ops->event_commit(&ctx); | |
705 | } | |
706 | end: | |
b5234c06 | 707 | free(str); |
8020ceb5 MD |
708 | return ret; |
709 | } | |
710 | ||
711 | static | |
7dd08bec | 712 | int _lttng_field_statedump(struct lttng_session *session, |
8020ceb5 MD |
713 | const struct lttng_event_field *field) |
714 | { | |
715 | int ret = 0; | |
716 | ||
180901e6 | 717 | if (field->nowrite) |
4774c8f3 MD |
718 | return 0; |
719 | ||
8020ceb5 MD |
720 | switch (field->type.atype) { |
721 | case atype_integer: | |
722 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 723 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
724 | field->type.u.basic.integer.size, |
725 | field->type.u.basic.integer.alignment, | |
726 | field->type.u.basic.integer.signedness, | |
727 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
728 | ? "none" | |
729 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
730 | ? "UTF8" | |
731 | : "ASCII", | |
732 | field->type.u.basic.integer.base, | |
8a98a75d | 733 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
734 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
735 | #else | |
736 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
737 | #endif | |
738 | field->name); | |
739 | break; | |
740 | case atype_float: | |
741 | ret = lttng_metadata_printf(session, | |
8a98a75d | 742 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
743 | field->type.u.basic._float.exp_dig, |
744 | field->type.u.basic._float.mant_dig, | |
745 | field->type.u.basic._float.alignment, | |
8a98a75d | 746 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
747 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
748 | #else | |
749 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
750 | #endif | |
751 | field->name); | |
752 | break; | |
753 | case atype_enum: | |
754 | ret = lttng_metadata_printf(session, | |
755 | " %s %s;\n", | |
756 | field->type.u.basic.enumeration.name, | |
757 | field->name); | |
758 | break; | |
759 | case atype_array: | |
760 | { | |
761 | const struct lttng_basic_type *elem_type; | |
762 | ||
763 | elem_type = &field->type.u.array.elem_type; | |
764 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 765 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
766 | elem_type->u.basic.integer.size, |
767 | elem_type->u.basic.integer.alignment, | |
768 | elem_type->u.basic.integer.signedness, | |
769 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
770 | ? "none" | |
771 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
772 | ? "UTF8" | |
773 | : "ASCII", | |
774 | elem_type->u.basic.integer.base, | |
8a98a75d | 775 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
776 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
777 | #else | |
778 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
779 | #endif | |
780 | field->name, field->type.u.array.length); | |
781 | break; | |
782 | } | |
783 | case atype_sequence: | |
784 | { | |
785 | const struct lttng_basic_type *elem_type; | |
786 | const struct lttng_basic_type *length_type; | |
787 | ||
788 | elem_type = &field->type.u.sequence.elem_type; | |
789 | length_type = &field->type.u.sequence.length_type; | |
790 | ret = lttng_metadata_printf(session, | |
791 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
792 | length_type->u.basic.integer.size, | |
793 | (unsigned int) length_type->u.basic.integer.alignment, | |
794 | length_type->u.basic.integer.signedness, | |
795 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
796 | ? "none" | |
797 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
798 | ? "UTF8" | |
799 | : "ASCII"), | |
800 | length_type->u.basic.integer.base, | |
8a98a75d | 801 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
802 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
803 | #else | |
804 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
805 | #endif | |
806 | field->name); | |
807 | if (ret) | |
808 | return ret; | |
809 | ||
810 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 811 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
812 | elem_type->u.basic.integer.size, |
813 | (unsigned int) elem_type->u.basic.integer.alignment, | |
814 | elem_type->u.basic.integer.signedness, | |
815 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
816 | ? "none" | |
817 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
818 | ? "UTF8" | |
819 | : "ASCII"), | |
820 | elem_type->u.basic.integer.base, | |
8a98a75d | 821 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
822 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
823 | #else | |
824 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
825 | #endif | |
826 | field->name, | |
827 | field->name); | |
828 | break; | |
829 | } | |
830 | ||
831 | case atype_string: | |
832 | /* Default encoding is UTF8 */ | |
833 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 834 | " string%s _%s;\n", |
8020ceb5 MD |
835 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
836 | " { encoding = ASCII; }" : "", | |
837 | field->name); | |
838 | break; | |
839 | default: | |
840 | WARN_ON_ONCE(1); | |
841 | return -EINVAL; | |
842 | } | |
843 | return ret; | |
844 | } | |
845 | ||
846 | static | |
7dd08bec | 847 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8020ceb5 MD |
848 | struct lttng_ctx *ctx) |
849 | { | |
850 | int ret = 0; | |
851 | int i; | |
852 | ||
853 | if (!ctx) | |
854 | return 0; | |
855 | for (i = 0; i < ctx->nr_fields; i++) { | |
856 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
857 | ||
7dd08bec | 858 | ret = _lttng_field_statedump(session, &field->event_field); |
8020ceb5 MD |
859 | if (ret) |
860 | return ret; | |
861 | } | |
862 | return ret; | |
863 | } | |
864 | ||
865 | static | |
7dd08bec MD |
866 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
867 | struct lttng_event *event) | |
8020ceb5 MD |
868 | { |
869 | const struct lttng_event_desc *desc = event->desc; | |
870 | int ret = 0; | |
871 | int i; | |
872 | ||
873 | for (i = 0; i < desc->nr_fields; i++) { | |
874 | const struct lttng_event_field *field = &desc->fields[i]; | |
875 | ||
7dd08bec | 876 | ret = _lttng_field_statedump(session, field); |
8020ceb5 MD |
877 | if (ret) |
878 | return ret; | |
879 | } | |
880 | return ret; | |
881 | } | |
882 | ||
883 | static | |
7dd08bec MD |
884 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
885 | struct lttng_channel *chan, | |
886 | struct lttng_event *event) | |
8020ceb5 MD |
887 | { |
888 | int ret = 0; | |
8155c5e8 | 889 | int loglevel = TRACE_DEFAULT; |
8020ceb5 | 890 | |
b5234c06 | 891 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
892 | return 0; |
893 | if (chan == session->metadata) | |
894 | return 0; | |
8165c8da MD |
895 | /* |
896 | * Don't print events for which probe load is pending. | |
897 | */ | |
898 | if (!event->desc) | |
899 | return 0; | |
8020ceb5 MD |
900 | |
901 | ret = lttng_metadata_printf(session, | |
902 | "event {\n" | |
7083f0fe | 903 | " name = \"%s\";\n" |
8020ceb5 MD |
904 | " id = %u;\n" |
905 | " stream_id = %u;\n", | |
906 | event->desc->name, | |
907 | event->id, | |
908 | event->chan->id); | |
909 | if (ret) | |
910 | goto end; | |
911 | ||
8155c5e8 MD |
912 | if (event->desc->loglevel) |
913 | loglevel = *(*event->desc->loglevel); | |
914 | ||
915 | ret = lttng_metadata_printf(session, | |
916 | " loglevel = %d;\n", | |
917 | loglevel); | |
918 | if (ret) | |
919 | goto end; | |
e6c12e3d | 920 | |
6ddc916d MD |
921 | if (event->desc->u.ext.model_emf_uri) { |
922 | ret = lttng_metadata_printf(session, | |
923 | " model.emf.uri = \"%s\";\n", | |
924 | *(event->desc->u.ext.model_emf_uri)); | |
925 | if (ret) | |
926 | goto end; | |
927 | } | |
928 | ||
8020ceb5 MD |
929 | if (event->ctx) { |
930 | ret = lttng_metadata_printf(session, | |
931 | " context := struct {\n"); | |
932 | if (ret) | |
933 | goto end; | |
934 | } | |
7dd08bec | 935 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8020ceb5 MD |
936 | if (ret) |
937 | goto end; | |
938 | if (event->ctx) { | |
939 | ret = lttng_metadata_printf(session, | |
940 | " };\n"); | |
941 | if (ret) | |
942 | goto end; | |
943 | } | |
944 | ||
945 | ret = lttng_metadata_printf(session, | |
946 | " fields := struct {\n" | |
947 | ); | |
948 | if (ret) | |
949 | goto end; | |
950 | ||
7dd08bec | 951 | ret = _lttng_fields_metadata_statedump(session, event); |
8020ceb5 MD |
952 | if (ret) |
953 | goto end; | |
954 | ||
955 | /* | |
956 | * LTTng space reservation can only reserve multiples of the | |
957 | * byte size. | |
958 | */ | |
959 | ret = lttng_metadata_printf(session, | |
960 | " };\n" | |
961 | "};\n\n"); | |
962 | if (ret) | |
963 | goto end; | |
964 | ||
965 | event->metadata_dumped = 1; | |
966 | end: | |
967 | return ret; | |
968 | ||
969 | } | |
970 | ||
971 | static | |
7dd08bec MD |
972 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
973 | struct lttng_channel *chan) | |
8020ceb5 MD |
974 | { |
975 | int ret = 0; | |
976 | ||
b5234c06 | 977 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
978 | return 0; |
979 | if (chan == session->metadata) | |
980 | return 0; | |
981 | ||
982 | WARN_ON_ONCE(!chan->header_type); | |
983 | ret = lttng_metadata_printf(session, | |
984 | "stream {\n" | |
985 | " id = %u;\n" | |
986 | " event.header := %s;\n" | |
987 | " packet.context := struct packet_context;\n", | |
988 | chan->id, | |
989 | chan->header_type == 1 ? "struct event_header_compact" : | |
990 | "struct event_header_large"); | |
991 | if (ret) | |
992 | goto end; | |
993 | ||
994 | if (chan->ctx) { | |
995 | ret = lttng_metadata_printf(session, | |
996 | " event.context := struct {\n"); | |
997 | if (ret) | |
998 | goto end; | |
999 | } | |
7dd08bec | 1000 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8020ceb5 MD |
1001 | if (ret) |
1002 | goto end; | |
1003 | if (chan->ctx) { | |
1004 | ret = lttng_metadata_printf(session, | |
1005 | " };\n"); | |
1006 | if (ret) | |
1007 | goto end; | |
1008 | } | |
1009 | ||
1010 | ret = lttng_metadata_printf(session, | |
1011 | "};\n\n"); | |
1012 | ||
1013 | chan->metadata_dumped = 1; | |
1014 | end: | |
1015 | return ret; | |
1016 | } | |
1017 | ||
1018 | static | |
7dd08bec | 1019 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
8020ceb5 MD |
1020 | { |
1021 | return lttng_metadata_printf(session, | |
1022 | "struct packet_context {\n" | |
28b12049 MD |
1023 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1024 | " uint64_clock_monotonic_t timestamp_end;\n" | |
0c00a107 MD |
1025 | " uint64_t content_size;\n" |
1026 | " uint64_t packet_size;\n" | |
18fc8d71 | 1027 | " unsigned long events_discarded;\n" |
8020ceb5 MD |
1028 | " uint32_t cpu_id;\n" |
1029 | "};\n\n" | |
1030 | ); | |
1031 | } | |
1032 | ||
1033 | /* | |
1034 | * Compact header: | |
1035 | * id: range: 0 - 30. | |
1036 | * id 31 is reserved to indicate an extended header. | |
1037 | * | |
1038 | * Large header: | |
1039 | * id: range: 0 - 65534. | |
1040 | * id 65535 is reserved to indicate an extended header. | |
1041 | */ | |
1042 | static | |
7dd08bec | 1043 | int _lttng_event_header_declare(struct lttng_session *session) |
8020ceb5 MD |
1044 | { |
1045 | return lttng_metadata_printf(session, | |
1046 | "struct event_header_compact {\n" | |
1047 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1048 | " variant <id> {\n" | |
1049 | " struct {\n" | |
28b12049 | 1050 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1051 | " } compact;\n" |
1052 | " struct {\n" | |
1053 | " uint32_t id;\n" | |
28b12049 | 1054 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1055 | " } extended;\n" |
1056 | " } v;\n" | |
1057 | "} align(%u);\n" | |
1058 | "\n" | |
1059 | "struct event_header_large {\n" | |
1060 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1061 | " variant <id> {\n" | |
1062 | " struct {\n" | |
28b12049 | 1063 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1064 | " } compact;\n" |
1065 | " struct {\n" | |
1066 | " uint32_t id;\n" | |
28b12049 | 1067 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1068 | " } extended;\n" |
1069 | " } v;\n" | |
1070 | "} align(%u);\n\n", | |
1dbfff0c MD |
1071 | lttng_alignof(uint32_t) * CHAR_BIT, |
1072 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1073 | ); |
1074 | } | |
1075 | ||
28b12049 MD |
1076 | /* |
1077 | * Approximation of NTP time of day to clock monotonic correlation, | |
1078 | * taken at start of trace. | |
1079 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1080 | * in future versions. | |
1081 | */ | |
1082 | static | |
1083 | uint64_t measure_clock_offset(void) | |
1084 | { | |
1085 | uint64_t offset, monotonic[2], realtime; | |
1086 | struct timespec rts = { 0, 0 }; | |
1087 | int ret; | |
1088 | ||
1089 | monotonic[0] = trace_clock_read64(); | |
1090 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1091 | if (ret < 0) | |
1092 | return 0; | |
1093 | monotonic[1] = trace_clock_read64(); | |
1094 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
17ec046a | 1095 | realtime = (uint64_t) rts.tv_sec * 1000000000ULL; |
28b12049 MD |
1096 | realtime += rts.tv_nsec; |
1097 | offset = realtime - offset; | |
1098 | return offset; | |
1099 | } | |
1100 | ||
8020ceb5 MD |
1101 | /* |
1102 | * Output metadata into this session's metadata buffers. | |
1103 | */ | |
1104 | static | |
7dd08bec | 1105 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
8020ceb5 | 1106 | { |
74d81a6c | 1107 | unsigned char *uuid_c; |
19d8b1b3 MD |
1108 | char uuid_s[LTTNG_UST_UUID_STR_LEN], |
1109 | clock_uuid_s[LTTNG_UST_UUID_STR_LEN]; | |
7dd08bec MD |
1110 | struct lttng_channel *chan; |
1111 | struct lttng_event *event; | |
8020ceb5 | 1112 | int ret = 0; |
08114193 | 1113 | char procname[LTTNG_UST_PROCNAME_LEN] = ""; |
9e4d42a0 | 1114 | char hostname[HOST_NAME_MAX]; |
8020ceb5 | 1115 | |
b5234c06 | 1116 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1117 | return 0; |
1118 | if (session->metadata_dumped) | |
1119 | goto skip_session; | |
1120 | if (!session->metadata) { | |
b5234c06 | 1121 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1122 | return -EPERM; |
1123 | } | |
74d81a6c | 1124 | uuid_c = session->metadata->uuid; |
8020ceb5 MD |
1125 | |
1126 | snprintf(uuid_s, sizeof(uuid_s), | |
1127 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1128 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1129 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1130 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1131 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1132 | ||
1133 | ret = lttng_metadata_printf(session, | |
1134 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1135 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1136 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1137 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
18fc8d71 | 1138 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
8020ceb5 MD |
1139 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
1140 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1141 | "\n" | |
1142 | "trace {\n" | |
1143 | " major = %u;\n" | |
1144 | " minor = %u;\n" | |
1145 | " uuid = \"%s\";\n" | |
1146 | " byte_order = %s;\n" | |
1147 | " packet.header := struct {\n" | |
1148 | " uint32_t magic;\n" | |
1149 | " uint8_t uuid[16];\n" | |
1150 | " uint32_t stream_id;\n" | |
1151 | " };\n" | |
1152 | "};\n\n", | |
1dbfff0c MD |
1153 | lttng_alignof(uint8_t) * CHAR_BIT, |
1154 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1155 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1156 | lttng_alignof(uint64_t) * CHAR_BIT, | |
18fc8d71 MD |
1157 | sizeof(unsigned long) * CHAR_BIT, |
1158 | lttng_alignof(unsigned long) * CHAR_BIT, | |
2694975d MD |
1159 | CTF_SPEC_MAJOR, |
1160 | CTF_SPEC_MINOR, | |
8020ceb5 | 1161 | uuid_s, |
8a98a75d | 1162 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1163 | "be" |
1164 | #else | |
1165 | "le" | |
1166 | #endif | |
1167 | ); | |
1168 | if (ret) | |
1169 | goto end; | |
1170 | ||
b020e504 | 1171 | /* ignore error, just use empty string if error. */ |
9e4d42a0 MD |
1172 | hostname[0] = '\0'; |
1173 | ret = gethostname(hostname, sizeof(hostname)); | |
1174 | if (ret && errno == ENAMETOOLONG) | |
1175 | hostname[HOST_NAME_MAX - 1] = '\0'; | |
08114193 MD |
1176 | lttng_ust_getprocname(procname); |
1177 | procname[LTTNG_UST_PROCNAME_LEN - 1] = '\0'; | |
b020e504 MD |
1178 | ret = lttng_metadata_printf(session, |
1179 | "env {\n" | |
9e4d42a0 | 1180 | " hostname = \"%s\";\n" |
b020e504 MD |
1181 | " vpid = %d;\n" |
1182 | " procname = \"%s\";\n" | |
2694975d MD |
1183 | " domain = \"ust\";\n" |
1184 | " tracer_name = \"lttng-ust\";\n" | |
1185 | " tracer_major = %u;\n" | |
1186 | " tracer_minor = %u;\n" | |
1187 | " tracer_patchlevel = %u;\n" | |
b020e504 | 1188 | "};\n\n", |
9e4d42a0 | 1189 | hostname, |
b020e504 MD |
1190 | (int) getpid(), |
1191 | procname, | |
2694975d MD |
1192 | LTTNG_UST_MAJOR_VERSION, |
1193 | LTTNG_UST_MINOR_VERSION, | |
1194 | LTTNG_UST_PATCHLEVEL_VERSION | |
b020e504 MD |
1195 | ); |
1196 | if (ret) | |
1197 | goto end; | |
1198 | ||
28b12049 MD |
1199 | ret = lttng_metadata_printf(session, |
1200 | "clock {\n" | |
939950af MD |
1201 | " name = %s;\n", |
1202 | "monotonic" | |
1203 | ); | |
1204 | if (ret) | |
1205 | goto end; | |
1206 | ||
1207 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1208 | ret = lttng_metadata_printf(session, | |
1209 | " uuid = \"%s\";\n", | |
1210 | clock_uuid_s | |
1211 | ); | |
1212 | if (ret) | |
1213 | goto end; | |
1214 | } | |
1215 | ||
1216 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1217 | " description = \"Monotonic Clock\";\n" |
1218 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1219 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1220 | " offset = %" PRIu64 ";\n" | |
1221 | "};\n\n", | |
28b12049 MD |
1222 | trace_clock_freq(), |
1223 | measure_clock_offset() | |
1224 | ); | |
1225 | if (ret) | |
1226 | goto end; | |
1227 | ||
1228 | ret = lttng_metadata_printf(session, | |
1229 | "typealias integer {\n" | |
1230 | " size = 27; align = 1; signed = false;\n" | |
1231 | " map = clock.monotonic.value;\n" | |
1232 | "} := uint27_clock_monotonic_t;\n" | |
1233 | "\n" | |
1234 | "typealias integer {\n" | |
1235 | " size = 32; align = %u; signed = false;\n" | |
1236 | " map = clock.monotonic.value;\n" | |
1237 | "} := uint32_clock_monotonic_t;\n" | |
1238 | "\n" | |
1239 | "typealias integer {\n" | |
1240 | " size = 64; align = %u; signed = false;\n" | |
1241 | " map = clock.monotonic.value;\n" | |
1242 | "} := uint64_clock_monotonic_t;\n\n", | |
1243 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1244 | lttng_alignof(uint64_t) * CHAR_BIT | |
1245 | ); | |
1246 | if (ret) | |
1247 | goto end; | |
1248 | ||
7dd08bec | 1249 | ret = _lttng_stream_packet_context_declare(session); |
8020ceb5 MD |
1250 | if (ret) |
1251 | goto end; | |
1252 | ||
7dd08bec | 1253 | ret = _lttng_event_header_declare(session); |
8020ceb5 MD |
1254 | if (ret) |
1255 | goto end; | |
1256 | ||
1257 | skip_session: | |
e58095ef | 1258 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
7dd08bec | 1259 | ret = _lttng_channel_metadata_statedump(session, chan); |
8020ceb5 MD |
1260 | if (ret) |
1261 | goto end; | |
1262 | } | |
1263 | ||
e58095ef | 1264 | cds_list_for_each_entry(event, &session->events_head, node) { |
7dd08bec | 1265 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
8020ceb5 MD |
1266 | if (ret) |
1267 | goto end; | |
1268 | } | |
1269 | session->metadata_dumped = 1; | |
1270 | end: | |
1271 | return ret; | |
1272 | } | |
1273 | ||
003fedf4 | 1274 | void lttng_ust_events_exit(void) |
8020ceb5 | 1275 | { |
7dd08bec | 1276 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1277 | |
e58095ef | 1278 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1279 | lttng_session_destroy(session); |
8020ceb5 | 1280 | } |
457a6b58 | 1281 | |
e58095ef MD |
1282 | /* |
1283 | * Enabler management. | |
1284 | */ | |
1285 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1286 | struct lttng_ust_event *event_param, | |
1287 | struct lttng_channel *chan) | |
457a6b58 | 1288 | { |
e58095ef MD |
1289 | struct lttng_enabler *enabler; |
1290 | ||
1291 | enabler = zmalloc(sizeof(*enabler)); | |
1292 | if (!enabler) | |
1293 | return NULL; | |
1294 | enabler->type = type; | |
1295 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
1296 | memcpy(&enabler->event_param, event_param, | |
1297 | sizeof(enabler->event_param)); | |
1298 | enabler->chan = chan; | |
1299 | /* ctx left NULL */ | |
1300 | enabler->enabled = 1; | |
1301 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1302 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1303 | return enabler; | |
457a6b58 MD |
1304 | } |
1305 | ||
e58095ef | 1306 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 1307 | { |
e58095ef MD |
1308 | enabler->enabled = 1; |
1309 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1310 | return 0; | |
457a6b58 | 1311 | } |
457a6b58 | 1312 | |
e58095ef | 1313 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 1314 | { |
e58095ef MD |
1315 | if (enabler->chan == enabler->chan->session->metadata) |
1316 | return -EPERM; | |
1317 | enabler->enabled = 0; | |
1318 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1319 | return 0; | |
1320 | } | |
457a6b58 | 1321 | |
e58095ef MD |
1322 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1323 | struct lttng_ust_filter_bytecode_node *bytecode) | |
1324 | { | |
1325 | bytecode->enabler = enabler; | |
1326 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
1327 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1328 | return 0; | |
1329 | } | |
f488575f | 1330 | |
e58095ef MD |
1331 | int lttng_attach_context(struct lttng_ust_context *context_param, |
1332 | struct lttng_ctx **ctx, struct lttng_session *session) | |
1333 | { | |
457a6b58 | 1334 | /* |
e58095ef MD |
1335 | * We cannot attach a context after trace has been started for a |
1336 | * session because the metadata does not allow expressing this | |
1337 | * information outside of the original channel scope. | |
457a6b58 | 1338 | */ |
e58095ef MD |
1339 | if (session->been_active) |
1340 | return -EPERM; | |
457a6b58 | 1341 | |
e58095ef MD |
1342 | switch (context_param->ctx) { |
1343 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1344 | return lttng_add_pthread_id_to_ctx(ctx); | |
1345 | case LTTNG_UST_CONTEXT_VTID: | |
1346 | return lttng_add_vtid_to_ctx(ctx); | |
1347 | case LTTNG_UST_CONTEXT_VPID: | |
1348 | return lttng_add_vpid_to_ctx(ctx); | |
1349 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1350 | return lttng_add_procname_to_ctx(ctx); | |
1351 | default: | |
1352 | return -EINVAL; | |
457a6b58 | 1353 | } |
457a6b58 MD |
1354 | } |
1355 | ||
e58095ef MD |
1356 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1357 | struct lttng_ust_context *context_param) | |
457a6b58 | 1358 | { |
e58095ef MD |
1359 | #if 0 // disabled for now. |
1360 | struct lttng_session *session = enabler->chan->session; | |
1361 | int ret; | |
457a6b58 | 1362 | |
e58095ef MD |
1363 | ret = lttng_attach_context(context_param, &enabler->ctx, |
1364 | session); | |
1365 | if (ret) | |
1366 | return ret; | |
1367 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1368 | #endif | |
1369 | return -ENOSYS; | |
457a6b58 MD |
1370 | } |
1371 | ||
e58095ef MD |
1372 | static |
1373 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 1374 | { |
e58095ef | 1375 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
457a6b58 | 1376 | |
e58095ef MD |
1377 | /* Destroy filter bytecode */ |
1378 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1379 | &enabler->filter_bytecode_head, node) { | |
1380 | free(filter_node); | |
457a6b58 | 1381 | } |
e58095ef MD |
1382 | |
1383 | /* Destroy contexts */ | |
1384 | lttng_destroy_context(enabler->ctx); | |
1385 | ||
1386 | cds_list_del(&enabler->node); | |
1387 | free(enabler); | |
457a6b58 MD |
1388 | } |
1389 | ||
e58095ef MD |
1390 | /* |
1391 | * lttng_session_sync_enablers should be called just before starting a | |
1392 | * session. | |
1393 | */ | |
457a6b58 | 1394 | static |
e58095ef | 1395 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 1396 | { |
e58095ef MD |
1397 | struct lttng_enabler *enabler; |
1398 | struct lttng_event *event; | |
457a6b58 | 1399 | |
e58095ef MD |
1400 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
1401 | lttng_enabler_ref_events(enabler); | |
1402 | /* | |
1403 | * For each event, if at least one of its enablers is enabled, | |
1404 | * we enable the event, else we disable it. | |
1405 | */ | |
1406 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1407 | struct lttng_enabler_ref *enabler_ref; | |
1408 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1409 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1410 | |
1411 | /* Enable events */ | |
1412 | cds_list_for_each_entry(enabler_ref, | |
1413 | &event->enablers_ref_head, node) { | |
1414 | if (enabler_ref->ref->enabled) { | |
1415 | enabled = 1; | |
1416 | break; | |
1417 | } | |
1418 | } | |
1419 | event->enabled = enabled; | |
457a6b58 | 1420 | |
1f49fc05 | 1421 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1422 | cds_list_for_each_entry(enabler_ref, |
1423 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1424 | if (enabler_ref->ref->enabled |
1425 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1426 | has_enablers_without_bytecode = 1; |
1427 | break; | |
1428 | } | |
1429 | } | |
1430 | event->has_enablers_without_bytecode = | |
1431 | has_enablers_without_bytecode; | |
1432 | ||
e58095ef MD |
1433 | /* Enable filters */ |
1434 | cds_list_for_each_entry(runtime, | |
1435 | &event->bytecode_runtime_head, node) { | |
1436 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
1437 | } |
1438 | } | |
457a6b58 MD |
1439 | } |
1440 | ||
e58095ef MD |
1441 | /* |
1442 | * Apply enablers to session events, adding events to session if need | |
1443 | * be. It is required after each modification applied to an active | |
1444 | * session, and right before session "start". | |
1445 | * "lazy" sync means we only sync if required. | |
1446 | */ | |
1447 | static | |
1448 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 1449 | { |
e58095ef MD |
1450 | /* We can skip if session is not active */ |
1451 | if (!session->active) | |
1452 | return; | |
1453 | lttng_session_sync_enablers(session); | |
457a6b58 | 1454 | } |