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; | |
7dd08bec | 252 | ret = _lttng_session_metadata_statedump(session); |
4b4de73e | 253 | if (ret) |
b5234c06 | 254 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 255 | end: |
8020ceb5 MD |
256 | return ret; |
257 | } | |
258 | ||
7dd08bec | 259 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
260 | { |
261 | int ret = 0; | |
262 | ||
8020ceb5 MD |
263 | if (!session->active) { |
264 | ret = -EBUSY; | |
265 | goto end; | |
266 | } | |
b5234c06 | 267 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 268 | end: |
8020ceb5 MD |
269 | return ret; |
270 | } | |
271 | ||
7dd08bec | 272 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea MD |
273 | { |
274 | int old; | |
275 | ||
9beb36ba MD |
276 | if (channel == channel->session->metadata) |
277 | return -EPERM; | |
b5234c06 | 278 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
279 | if (old) |
280 | return -EEXIST; | |
281 | return 0; | |
282 | } | |
283 | ||
7dd08bec | 284 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea MD |
285 | { |
286 | int old; | |
287 | ||
9beb36ba MD |
288 | if (channel == channel->session->metadata) |
289 | return -EPERM; | |
b5234c06 | 290 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
291 | if (!old) |
292 | return -EEXIST; | |
293 | return 0; | |
294 | } | |
295 | ||
7dd08bec | 296 | int lttng_event_enable(struct lttng_event *event) |
976fe9ea MD |
297 | { |
298 | int old; | |
299 | ||
9beb36ba MD |
300 | if (event->chan == event->chan->session->metadata) |
301 | return -EPERM; | |
b5234c06 | 302 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
303 | if (old) |
304 | return -EEXIST; | |
305 | return 0; | |
306 | } | |
307 | ||
7dd08bec | 308 | int lttng_event_disable(struct lttng_event *event) |
976fe9ea MD |
309 | { |
310 | int old; | |
311 | ||
9beb36ba MD |
312 | if (event->chan == event->chan->session->metadata) |
313 | return -EPERM; | |
b5234c06 | 314 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
315 | if (!old) |
316 | return -EEXIST; | |
317 | return 0; | |
318 | } | |
319 | ||
8020ceb5 MD |
320 | /* |
321 | * Supports event creation while tracing session is active. | |
322 | */ | |
e58095ef MD |
323 | static |
324 | int lttng_event_create(const struct lttng_event_desc *desc, | |
325 | struct lttng_channel *chan) | |
8020ceb5 | 326 | { |
e58095ef | 327 | const char *event_name = desc->name; |
7dd08bec | 328 | struct lttng_event *event; |
32ce8569 | 329 | struct lttng_session *session = chan->session; |
d56fa719 MD |
330 | struct cds_hlist_head *head; |
331 | struct cds_hlist_node *node; | |
576599a0 | 332 | int ret = 0; |
d56fa719 MD |
333 | size_t name_len = strlen(event_name); |
334 | uint32_t hash; | |
32ce8569 MD |
335 | int notify_socket, loglevel; |
336 | const char *uri; | |
8020ceb5 | 337 | |
d56fa719 MD |
338 | hash = jhash(event_name, name_len, 0); |
339 | head = &chan->session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
340 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef MD |
341 | assert(event->desc); |
342 | if (!strncmp(event->desc->name, | |
343 | desc->name, | |
ff412fb5 | 344 | LTTNG_UST_SYM_NAME_LEN - 1)) { |
576599a0 | 345 | ret = -EEXIST; |
8020ceb5 | 346 | goto exist; |
576599a0 MD |
347 | } |
348 | } | |
457a6b58 | 349 | |
32ce8569 MD |
350 | notify_socket = lttng_get_notify_socket(session->owner); |
351 | if (notify_socket < 0) { | |
352 | ret = notify_socket; | |
353 | goto socket_error; | |
354 | } | |
355 | ||
457a6b58 MD |
356 | /* |
357 | * Check if loglevel match. Refuse to connect event if not. | |
358 | */ | |
7dd08bec | 359 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
360 | if (!event) { |
361 | ret = -ENOMEM; | |
8020ceb5 | 362 | goto cache_error; |
576599a0 | 363 | } |
8020ceb5 | 364 | event->chan = chan; |
e58095ef | 365 | |
976fe9ea | 366 | event->enabled = 1; |
e58095ef MD |
367 | CDS_INIT_LIST_HEAD(&event->bytecode_runtime_head); |
368 | CDS_INIT_LIST_HEAD(&event->enablers_ref_head); | |
369 | event->desc = desc; | |
32ce8569 MD |
370 | |
371 | if (desc->loglevel) | |
372 | loglevel = *(*event->desc->loglevel); | |
373 | else | |
374 | loglevel = TRACE_DEFAULT; | |
375 | if (desc->u.ext.model_emf_uri) | |
376 | uri = *(desc->u.ext.model_emf_uri); | |
377 | else | |
378 | uri = NULL; | |
379 | ||
380 | /* Fetch event ID from sessiond */ | |
381 | ret = ustcomm_register_event(notify_socket, | |
382 | session->objd, | |
383 | chan->objd, | |
384 | event_name, | |
385 | loglevel, | |
386 | desc->signature, | |
387 | desc->nr_fields, | |
388 | desc->fields, | |
389 | uri, | |
390 | &event->id); | |
391 | if (ret < 0) { | |
392 | goto sessiond_register_error; | |
393 | } | |
7dd08bec | 394 | /* Populate lttng_event structure before tracepoint registration. */ |
b5234c06 | 395 | cmm_smp_wmb(); |
e58095ef MD |
396 | ret = __tracepoint_probe_register(event_name, |
397 | desc->probe_callback, | |
398 | event, desc->signature); | |
399 | if (ret) | |
32ce8569 MD |
400 | goto tracepoint_register_error; |
401 | ||
e58095ef MD |
402 | ret = _lttng_event_metadata_statedump(chan->session, chan, event); |
403 | if (ret) | |
404 | goto statedump_error; | |
405 | cds_list_add(&event->node, &chan->session->events_head); | |
d56fa719 | 406 | cds_hlist_add_head(&event->hlist, head); |
576599a0 | 407 | return 0; |
8020ceb5 MD |
408 | |
409 | statedump_error: | |
e58095ef MD |
410 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_name, |
411 | desc->probe_callback, | |
412 | event)); | |
32ce8569 MD |
413 | tracepoint_register_error: |
414 | sessiond_register_error: | |
b5234c06 | 415 | free(event); |
8020ceb5 | 416 | cache_error: |
32ce8569 | 417 | socket_error: |
8020ceb5 | 418 | exist: |
576599a0 | 419 | return ret; |
8020ceb5 MD |
420 | } |
421 | ||
e58095ef MD |
422 | static |
423 | int lttng_desc_match_wildcard_enabler(const struct lttng_event_desc *desc, | |
424 | struct lttng_enabler *enabler) | |
425 | { | |
426 | int loglevel = 0; | |
427 | unsigned int has_loglevel; | |
428 | ||
429 | assert(enabler->type == LTTNG_ENABLER_WILDCARD); | |
430 | /* Compare excluding final '*' */ | |
431 | if (strncmp(desc->name, enabler->event_param.name, | |
432 | strlen(enabler->event_param.name) - 1)) | |
433 | return 0; | |
434 | if (desc->loglevel) { | |
435 | loglevel = *(*desc->loglevel); | |
436 | has_loglevel = 1; | |
437 | } | |
438 | if (!lttng_loglevel_match(loglevel, | |
439 | has_loglevel, | |
440 | enabler->event_param.loglevel_type, | |
441 | enabler->event_param.loglevel)) | |
442 | return 0; | |
443 | return 1; | |
444 | } | |
445 | ||
446 | static | |
447 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
448 | struct lttng_enabler *enabler) | |
449 | { | |
450 | int loglevel = 0; | |
451 | unsigned int has_loglevel = 0; | |
452 | ||
453 | assert(enabler->type == LTTNG_ENABLER_EVENT); | |
454 | if (strcmp(desc->name, enabler->event_param.name)) | |
455 | return 0; | |
456 | if (desc->loglevel) { | |
457 | loglevel = *(*desc->loglevel); | |
458 | has_loglevel = 1; | |
459 | } | |
460 | if (!lttng_loglevel_match(loglevel, | |
461 | has_loglevel, | |
462 | enabler->event_param.loglevel_type, | |
463 | enabler->event_param.loglevel)) | |
464 | return 0; | |
465 | return 1; | |
466 | } | |
467 | ||
468 | static | |
469 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
470 | struct lttng_enabler *enabler) | |
471 | { | |
472 | switch (enabler->type) { | |
473 | case LTTNG_ENABLER_WILDCARD: | |
474 | return lttng_desc_match_wildcard_enabler(desc, enabler); | |
475 | case LTTNG_ENABLER_EVENT: | |
476 | return lttng_desc_match_event_enabler(desc, enabler); | |
477 | default: | |
478 | return -EINVAL; | |
479 | } | |
480 | } | |
481 | ||
482 | static | |
483 | int lttng_event_match_enabler(struct lttng_event *event, | |
484 | struct lttng_enabler *enabler) | |
485 | { | |
486 | return lttng_desc_match_enabler(event->desc, enabler); | |
487 | } | |
488 | ||
489 | static | |
490 | struct lttng_enabler_ref * lttng_event_enabler_ref(struct lttng_event *event, | |
491 | struct lttng_enabler *enabler) | |
492 | { | |
493 | struct lttng_enabler_ref *enabler_ref; | |
494 | ||
495 | cds_list_for_each_entry(enabler_ref, | |
496 | &event->enablers_ref_head, node) { | |
497 | if (enabler_ref->ref == enabler) | |
498 | return enabler_ref; | |
499 | } | |
500 | return NULL; | |
501 | } | |
502 | ||
8020ceb5 | 503 | /* |
e58095ef MD |
504 | * Create struct lttng_event if it is missing and present in the list of |
505 | * tracepoint probes. | |
8020ceb5 | 506 | */ |
e58095ef MD |
507 | static |
508 | void lttng_create_event_if_missing(struct lttng_enabler *enabler) | |
8020ceb5 | 509 | { |
e58095ef MD |
510 | struct lttng_session *session = enabler->chan->session; |
511 | struct lttng_probe_desc *probe_desc; | |
512 | const struct lttng_event_desc *desc; | |
513 | struct lttng_event *event; | |
514 | int i; | |
515 | struct cds_list_head *probe_list; | |
516 | ||
517 | probe_list = lttng_get_probe_list_head(); | |
518 | /* | |
519 | * For each probe event, if we find that a probe event matches | |
520 | * our enabler, create an associated lttng_event if not | |
521 | * already present. | |
522 | */ | |
523 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
524 | for (i = 0; i < probe_desc->nr_events; i++) { | |
525 | int found = 0, ret; | |
d56fa719 MD |
526 | struct cds_hlist_head *head; |
527 | struct cds_hlist_node *node; | |
528 | const char *event_name; | |
529 | size_t name_len; | |
530 | uint32_t hash; | |
e58095ef MD |
531 | |
532 | desc = probe_desc->event_desc[i]; | |
533 | if (!lttng_desc_match_enabler(desc, enabler)) | |
534 | continue; | |
d56fa719 MD |
535 | event_name = desc->name; |
536 | name_len = strlen(event_name); | |
e58095ef MD |
537 | |
538 | /* | |
d56fa719 | 539 | * Check if already created. |
e58095ef | 540 | */ |
d56fa719 MD |
541 | hash = jhash(event_name, name_len, 0); |
542 | head = &session->events_ht.table[hash & (LTTNG_UST_EVENT_HT_SIZE - 1)]; | |
543 | cds_hlist_for_each_entry(event, node, head, hlist) { | |
e58095ef MD |
544 | if (event->desc == desc) |
545 | found = 1; | |
546 | } | |
547 | if (found) | |
548 | continue; | |
549 | ||
550 | /* | |
551 | * We need to create an event for this | |
552 | * event probe. | |
553 | */ | |
554 | ret = lttng_event_create(probe_desc->event_desc[i], | |
555 | enabler->chan); | |
556 | if (ret) { | |
32ce8569 MD |
557 | DBG("Unable to create event %s, error %d\n", |
558 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 559 | } |
8165c8da | 560 | } |
8020ceb5 | 561 | } |
8020ceb5 MD |
562 | } |
563 | ||
564 | /* | |
e58095ef MD |
565 | * Create events associated with an enabler (if not already present), |
566 | * and add backward reference from the event to the enabler. | |
8020ceb5 MD |
567 | */ |
568 | static | |
e58095ef | 569 | int lttng_enabler_ref_events(struct lttng_enabler *enabler) |
8020ceb5 | 570 | { |
e58095ef MD |
571 | struct lttng_session *session = enabler->chan->session; |
572 | struct lttng_event *event; | |
573 | ||
574 | /* First ensure that probe events are created for this enabler. */ | |
575 | lttng_create_event_if_missing(enabler); | |
576 | ||
577 | /* For each event matching enabler in session event list. */ | |
578 | cds_list_for_each_entry(event, &session->events_head, node) { | |
579 | struct lttng_enabler_ref *enabler_ref; | |
580 | ||
581 | if (!lttng_event_match_enabler(event, enabler)) | |
582 | continue; | |
583 | ||
584 | enabler_ref = lttng_event_enabler_ref(event, enabler); | |
585 | if (!enabler_ref) { | |
586 | /* | |
587 | * If no backward ref, create it. | |
588 | * Add backward ref from event to enabler. | |
589 | */ | |
590 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
591 | if (!enabler_ref) | |
592 | return -ENOMEM; | |
593 | enabler_ref->ref = enabler; | |
594 | cds_list_add(&enabler_ref->node, | |
595 | &event->enablers_ref_head); | |
8165c8da | 596 | } |
e58095ef MD |
597 | |
598 | /* | |
599 | * Link filter bytecodes if not linked yet. | |
600 | */ | |
601 | lttng_enabler_event_link_bytecode(event, enabler); | |
602 | ||
603 | /* TODO: merge event context. */ | |
604 | } | |
605 | return 0; | |
606 | } | |
607 | ||
608 | /* | |
609 | * Called at library load: connect the probe on all enablers matching | |
610 | * this event. | |
611 | * called with session mutex held. | |
612 | * TODO: currently, for each desc added, we iterate on all event desc | |
613 | * (inefficient). We should create specific code that only target the | |
614 | * added desc. | |
615 | */ | |
616 | int lttng_fix_pending_event_desc(const struct lttng_event_desc *desc) | |
617 | { | |
618 | struct lttng_session *session; | |
619 | ||
620 | cds_list_for_each_entry(session, &sessions, node) { | |
621 | lttng_session_lazy_sync_enablers(session); | |
8020ceb5 | 622 | } |
e58095ef MD |
623 | return 0; |
624 | } | |
625 | ||
626 | /* | |
627 | * Only used internally at session destruction. | |
628 | */ | |
629 | int _lttng_event_unregister(struct lttng_event *event) | |
630 | { | |
631 | return __tracepoint_probe_unregister(event->desc->name, | |
632 | event->desc->probe_callback, | |
633 | event); | |
634 | } | |
635 | ||
636 | /* | |
637 | * Only used internally at session destruction. | |
638 | */ | |
639 | static | |
640 | void _lttng_event_destroy(struct lttng_event *event) | |
641 | { | |
642 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
643 | ||
e58095ef | 644 | cds_list_del(&event->node); |
8020ceb5 | 645 | lttng_destroy_context(event->ctx); |
f488575f | 646 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
647 | /* Free event enabler refs */ |
648 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
649 | &event->enablers_ref_head, node) | |
650 | free(enabler_ref); | |
b5234c06 | 651 | free(event); |
8020ceb5 MD |
652 | } |
653 | ||
654 | /* | |
655 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 656 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
657 | * remaining space left in packet and write, since mutual exclusion |
658 | * protects us from concurrent writes. | |
659 | */ | |
7dd08bec | 660 | int lttng_metadata_printf(struct lttng_session *session, |
8020ceb5 MD |
661 | const char *fmt, ...) |
662 | { | |
4cfec15c | 663 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
7dd08bec | 664 | struct lttng_channel *chan = session->metadata; |
b5234c06 | 665 | char *str = NULL; |
8020ceb5 MD |
666 | int ret = 0, waitret; |
667 | size_t len, reserve_len, pos; | |
668 | va_list ap; | |
669 | ||
b5234c06 | 670 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
671 | |
672 | va_start(ap, fmt); | |
b5234c06 | 673 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 674 | va_end(ap); |
b5234c06 | 675 | if (ret < 0) |
8020ceb5 MD |
676 | return -ENOMEM; |
677 | ||
678 | len = strlen(str); | |
679 | pos = 0; | |
680 | ||
681 | for (pos = 0; pos < len; pos += reserve_len) { | |
682 | reserve_len = min_t(size_t, | |
1d498196 | 683 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
684 | len - pos); |
685 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 686 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
687 | /* |
688 | * We don't care about metadata buffer's records lost | |
689 | * count, because we always retry here. Report error if | |
690 | * we need to bail out after timeout or being | |
691 | * interrupted. | |
692 | */ | |
b5234c06 | 693 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
694 | ({ |
695 | ret = chan->ops->event_reserve(&ctx, 0); | |
696 | ret != -ENOBUFS || !ret; | |
697 | }), | |
b5234c06 | 698 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 699 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
700 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
701 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 702 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 703 | if (waitret == -EINTR) |
8020ceb5 MD |
704 | ret = waitret; |
705 | goto end; | |
706 | } | |
707 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
708 | chan->ops->event_commit(&ctx); | |
709 | } | |
710 | end: | |
b5234c06 | 711 | free(str); |
8020ceb5 MD |
712 | return ret; |
713 | } | |
714 | ||
715 | static | |
7dd08bec | 716 | int _lttng_field_statedump(struct lttng_session *session, |
8020ceb5 MD |
717 | const struct lttng_event_field *field) |
718 | { | |
719 | int ret = 0; | |
720 | ||
180901e6 | 721 | if (field->nowrite) |
4774c8f3 MD |
722 | return 0; |
723 | ||
8020ceb5 MD |
724 | switch (field->type.atype) { |
725 | case atype_integer: | |
726 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 727 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
728 | field->type.u.basic.integer.size, |
729 | field->type.u.basic.integer.alignment, | |
730 | field->type.u.basic.integer.signedness, | |
731 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
732 | ? "none" | |
733 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
734 | ? "UTF8" | |
735 | : "ASCII", | |
736 | field->type.u.basic.integer.base, | |
8a98a75d | 737 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
738 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
739 | #else | |
740 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
741 | #endif | |
742 | field->name); | |
743 | break; | |
744 | case atype_float: | |
745 | ret = lttng_metadata_printf(session, | |
8a98a75d | 746 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
747 | field->type.u.basic._float.exp_dig, |
748 | field->type.u.basic._float.mant_dig, | |
749 | field->type.u.basic._float.alignment, | |
8a98a75d | 750 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
751 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
752 | #else | |
753 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
754 | #endif | |
755 | field->name); | |
756 | break; | |
757 | case atype_enum: | |
758 | ret = lttng_metadata_printf(session, | |
759 | " %s %s;\n", | |
760 | field->type.u.basic.enumeration.name, | |
761 | field->name); | |
762 | break; | |
763 | case atype_array: | |
764 | { | |
765 | const struct lttng_basic_type *elem_type; | |
766 | ||
767 | elem_type = &field->type.u.array.elem_type; | |
768 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 769 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
770 | elem_type->u.basic.integer.size, |
771 | elem_type->u.basic.integer.alignment, | |
772 | elem_type->u.basic.integer.signedness, | |
773 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
774 | ? "none" | |
775 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
776 | ? "UTF8" | |
777 | : "ASCII", | |
778 | elem_type->u.basic.integer.base, | |
8a98a75d | 779 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
780 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
781 | #else | |
782 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
783 | #endif | |
784 | field->name, field->type.u.array.length); | |
785 | break; | |
786 | } | |
787 | case atype_sequence: | |
788 | { | |
789 | const struct lttng_basic_type *elem_type; | |
790 | const struct lttng_basic_type *length_type; | |
791 | ||
792 | elem_type = &field->type.u.sequence.elem_type; | |
793 | length_type = &field->type.u.sequence.length_type; | |
794 | ret = lttng_metadata_printf(session, | |
795 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
796 | length_type->u.basic.integer.size, | |
797 | (unsigned int) length_type->u.basic.integer.alignment, | |
798 | length_type->u.basic.integer.signedness, | |
799 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
800 | ? "none" | |
801 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
802 | ? "UTF8" | |
803 | : "ASCII"), | |
804 | length_type->u.basic.integer.base, | |
8a98a75d | 805 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
806 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
807 | #else | |
808 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
809 | #endif | |
810 | field->name); | |
811 | if (ret) | |
812 | return ret; | |
813 | ||
814 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 815 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
816 | elem_type->u.basic.integer.size, |
817 | (unsigned int) elem_type->u.basic.integer.alignment, | |
818 | elem_type->u.basic.integer.signedness, | |
819 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
820 | ? "none" | |
821 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
822 | ? "UTF8" | |
823 | : "ASCII"), | |
824 | elem_type->u.basic.integer.base, | |
8a98a75d | 825 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
826 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
827 | #else | |
828 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
829 | #endif | |
830 | field->name, | |
831 | field->name); | |
832 | break; | |
833 | } | |
834 | ||
835 | case atype_string: | |
836 | /* Default encoding is UTF8 */ | |
837 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 838 | " string%s _%s;\n", |
8020ceb5 MD |
839 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
840 | " { encoding = ASCII; }" : "", | |
841 | field->name); | |
842 | break; | |
843 | default: | |
844 | WARN_ON_ONCE(1); | |
845 | return -EINVAL; | |
846 | } | |
847 | return ret; | |
848 | } | |
849 | ||
850 | static | |
7dd08bec | 851 | int _lttng_context_metadata_statedump(struct lttng_session *session, |
8020ceb5 MD |
852 | struct lttng_ctx *ctx) |
853 | { | |
854 | int ret = 0; | |
855 | int i; | |
856 | ||
857 | if (!ctx) | |
858 | return 0; | |
859 | for (i = 0; i < ctx->nr_fields; i++) { | |
860 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
861 | ||
7dd08bec | 862 | ret = _lttng_field_statedump(session, &field->event_field); |
8020ceb5 MD |
863 | if (ret) |
864 | return ret; | |
865 | } | |
866 | return ret; | |
867 | } | |
868 | ||
869 | static | |
7dd08bec MD |
870 | int _lttng_fields_metadata_statedump(struct lttng_session *session, |
871 | struct lttng_event *event) | |
8020ceb5 MD |
872 | { |
873 | const struct lttng_event_desc *desc = event->desc; | |
874 | int ret = 0; | |
875 | int i; | |
876 | ||
877 | for (i = 0; i < desc->nr_fields; i++) { | |
878 | const struct lttng_event_field *field = &desc->fields[i]; | |
879 | ||
7dd08bec | 880 | ret = _lttng_field_statedump(session, field); |
8020ceb5 MD |
881 | if (ret) |
882 | return ret; | |
883 | } | |
884 | return ret; | |
885 | } | |
886 | ||
887 | static | |
7dd08bec MD |
888 | int _lttng_event_metadata_statedump(struct lttng_session *session, |
889 | struct lttng_channel *chan, | |
890 | struct lttng_event *event) | |
8020ceb5 MD |
891 | { |
892 | int ret = 0; | |
8155c5e8 | 893 | int loglevel = TRACE_DEFAULT; |
8020ceb5 | 894 | |
b5234c06 | 895 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
896 | return 0; |
897 | if (chan == session->metadata) | |
898 | return 0; | |
8165c8da MD |
899 | /* |
900 | * Don't print events for which probe load is pending. | |
901 | */ | |
902 | if (!event->desc) | |
903 | return 0; | |
8020ceb5 MD |
904 | |
905 | ret = lttng_metadata_printf(session, | |
906 | "event {\n" | |
7083f0fe | 907 | " name = \"%s\";\n" |
8020ceb5 MD |
908 | " id = %u;\n" |
909 | " stream_id = %u;\n", | |
910 | event->desc->name, | |
911 | event->id, | |
912 | event->chan->id); | |
913 | if (ret) | |
914 | goto end; | |
915 | ||
8155c5e8 MD |
916 | if (event->desc->loglevel) |
917 | loglevel = *(*event->desc->loglevel); | |
918 | ||
919 | ret = lttng_metadata_printf(session, | |
920 | " loglevel = %d;\n", | |
921 | loglevel); | |
922 | if (ret) | |
923 | goto end; | |
e6c12e3d | 924 | |
6ddc916d MD |
925 | if (event->desc->u.ext.model_emf_uri) { |
926 | ret = lttng_metadata_printf(session, | |
927 | " model.emf.uri = \"%s\";\n", | |
928 | *(event->desc->u.ext.model_emf_uri)); | |
929 | if (ret) | |
930 | goto end; | |
931 | } | |
932 | ||
8020ceb5 MD |
933 | if (event->ctx) { |
934 | ret = lttng_metadata_printf(session, | |
935 | " context := struct {\n"); | |
936 | if (ret) | |
937 | goto end; | |
938 | } | |
7dd08bec | 939 | ret = _lttng_context_metadata_statedump(session, event->ctx); |
8020ceb5 MD |
940 | if (ret) |
941 | goto end; | |
942 | if (event->ctx) { | |
943 | ret = lttng_metadata_printf(session, | |
944 | " };\n"); | |
945 | if (ret) | |
946 | goto end; | |
947 | } | |
948 | ||
949 | ret = lttng_metadata_printf(session, | |
950 | " fields := struct {\n" | |
951 | ); | |
952 | if (ret) | |
953 | goto end; | |
954 | ||
7dd08bec | 955 | ret = _lttng_fields_metadata_statedump(session, event); |
8020ceb5 MD |
956 | if (ret) |
957 | goto end; | |
958 | ||
959 | /* | |
960 | * LTTng space reservation can only reserve multiples of the | |
961 | * byte size. | |
962 | */ | |
963 | ret = lttng_metadata_printf(session, | |
964 | " };\n" | |
965 | "};\n\n"); | |
966 | if (ret) | |
967 | goto end; | |
968 | ||
969 | event->metadata_dumped = 1; | |
970 | end: | |
971 | return ret; | |
972 | ||
973 | } | |
974 | ||
975 | static | |
7dd08bec MD |
976 | int _lttng_channel_metadata_statedump(struct lttng_session *session, |
977 | struct lttng_channel *chan) | |
8020ceb5 MD |
978 | { |
979 | int ret = 0; | |
980 | ||
b5234c06 | 981 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
982 | return 0; |
983 | if (chan == session->metadata) | |
984 | return 0; | |
985 | ||
986 | WARN_ON_ONCE(!chan->header_type); | |
987 | ret = lttng_metadata_printf(session, | |
988 | "stream {\n" | |
989 | " id = %u;\n" | |
990 | " event.header := %s;\n" | |
991 | " packet.context := struct packet_context;\n", | |
992 | chan->id, | |
993 | chan->header_type == 1 ? "struct event_header_compact" : | |
994 | "struct event_header_large"); | |
995 | if (ret) | |
996 | goto end; | |
997 | ||
998 | if (chan->ctx) { | |
999 | ret = lttng_metadata_printf(session, | |
1000 | " event.context := struct {\n"); | |
1001 | if (ret) | |
1002 | goto end; | |
1003 | } | |
7dd08bec | 1004 | ret = _lttng_context_metadata_statedump(session, chan->ctx); |
8020ceb5 MD |
1005 | if (ret) |
1006 | goto end; | |
1007 | if (chan->ctx) { | |
1008 | ret = lttng_metadata_printf(session, | |
1009 | " };\n"); | |
1010 | if (ret) | |
1011 | goto end; | |
1012 | } | |
1013 | ||
1014 | ret = lttng_metadata_printf(session, | |
1015 | "};\n\n"); | |
1016 | ||
1017 | chan->metadata_dumped = 1; | |
1018 | end: | |
1019 | return ret; | |
1020 | } | |
1021 | ||
1022 | static | |
7dd08bec | 1023 | int _lttng_stream_packet_context_declare(struct lttng_session *session) |
8020ceb5 MD |
1024 | { |
1025 | return lttng_metadata_printf(session, | |
1026 | "struct packet_context {\n" | |
28b12049 MD |
1027 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1028 | " uint64_clock_monotonic_t timestamp_end;\n" | |
0c00a107 MD |
1029 | " uint64_t content_size;\n" |
1030 | " uint64_t packet_size;\n" | |
18fc8d71 | 1031 | " unsigned long events_discarded;\n" |
8020ceb5 MD |
1032 | " uint32_t cpu_id;\n" |
1033 | "};\n\n" | |
1034 | ); | |
1035 | } | |
1036 | ||
1037 | /* | |
1038 | * Compact header: | |
1039 | * id: range: 0 - 30. | |
1040 | * id 31 is reserved to indicate an extended header. | |
1041 | * | |
1042 | * Large header: | |
1043 | * id: range: 0 - 65534. | |
1044 | * id 65535 is reserved to indicate an extended header. | |
1045 | */ | |
1046 | static | |
7dd08bec | 1047 | int _lttng_event_header_declare(struct lttng_session *session) |
8020ceb5 MD |
1048 | { |
1049 | return lttng_metadata_printf(session, | |
1050 | "struct event_header_compact {\n" | |
1051 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1052 | " variant <id> {\n" | |
1053 | " struct {\n" | |
28b12049 | 1054 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1055 | " } compact;\n" |
1056 | " struct {\n" | |
1057 | " uint32_t id;\n" | |
28b12049 | 1058 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1059 | " } extended;\n" |
1060 | " } v;\n" | |
1061 | "} align(%u);\n" | |
1062 | "\n" | |
1063 | "struct event_header_large {\n" | |
1064 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1065 | " variant <id> {\n" | |
1066 | " struct {\n" | |
28b12049 | 1067 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1068 | " } compact;\n" |
1069 | " struct {\n" | |
1070 | " uint32_t id;\n" | |
28b12049 | 1071 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1072 | " } extended;\n" |
1073 | " } v;\n" | |
1074 | "} align(%u);\n\n", | |
1dbfff0c MD |
1075 | lttng_alignof(uint32_t) * CHAR_BIT, |
1076 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1077 | ); |
1078 | } | |
1079 | ||
28b12049 MD |
1080 | /* |
1081 | * Approximation of NTP time of day to clock monotonic correlation, | |
1082 | * taken at start of trace. | |
1083 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1084 | * in future versions. | |
1085 | */ | |
1086 | static | |
1087 | uint64_t measure_clock_offset(void) | |
1088 | { | |
1089 | uint64_t offset, monotonic[2], realtime; | |
1090 | struct timespec rts = { 0, 0 }; | |
1091 | int ret; | |
1092 | ||
1093 | monotonic[0] = trace_clock_read64(); | |
1094 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1095 | if (ret < 0) | |
1096 | return 0; | |
1097 | monotonic[1] = trace_clock_read64(); | |
1098 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
17ec046a | 1099 | realtime = (uint64_t) rts.tv_sec * 1000000000ULL; |
28b12049 MD |
1100 | realtime += rts.tv_nsec; |
1101 | offset = realtime - offset; | |
1102 | return offset; | |
1103 | } | |
1104 | ||
8020ceb5 MD |
1105 | /* |
1106 | * Output metadata into this session's metadata buffers. | |
1107 | */ | |
1108 | static | |
7dd08bec | 1109 | int _lttng_session_metadata_statedump(struct lttng_session *session) |
8020ceb5 | 1110 | { |
74d81a6c | 1111 | unsigned char *uuid_c; |
19d8b1b3 MD |
1112 | char uuid_s[LTTNG_UST_UUID_STR_LEN], |
1113 | clock_uuid_s[LTTNG_UST_UUID_STR_LEN]; | |
7dd08bec MD |
1114 | struct lttng_channel *chan; |
1115 | struct lttng_event *event; | |
8020ceb5 | 1116 | int ret = 0; |
08114193 | 1117 | char procname[LTTNG_UST_PROCNAME_LEN] = ""; |
9e4d42a0 | 1118 | char hostname[HOST_NAME_MAX]; |
8020ceb5 | 1119 | |
b5234c06 | 1120 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1121 | return 0; |
1122 | if (session->metadata_dumped) | |
1123 | goto skip_session; | |
1124 | if (!session->metadata) { | |
b5234c06 | 1125 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1126 | return -EPERM; |
1127 | } | |
74d81a6c | 1128 | uuid_c = session->metadata->uuid; |
8020ceb5 MD |
1129 | |
1130 | snprintf(uuid_s, sizeof(uuid_s), | |
1131 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1132 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1133 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1134 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1135 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1136 | ||
1137 | ret = lttng_metadata_printf(session, | |
1138 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1139 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1140 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1141 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
18fc8d71 | 1142 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
8020ceb5 MD |
1143 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
1144 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1145 | "\n" | |
1146 | "trace {\n" | |
1147 | " major = %u;\n" | |
1148 | " minor = %u;\n" | |
1149 | " uuid = \"%s\";\n" | |
1150 | " byte_order = %s;\n" | |
1151 | " packet.header := struct {\n" | |
1152 | " uint32_t magic;\n" | |
1153 | " uint8_t uuid[16];\n" | |
1154 | " uint32_t stream_id;\n" | |
1155 | " };\n" | |
1156 | "};\n\n", | |
1dbfff0c MD |
1157 | lttng_alignof(uint8_t) * CHAR_BIT, |
1158 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1159 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1160 | lttng_alignof(uint64_t) * CHAR_BIT, | |
18fc8d71 MD |
1161 | sizeof(unsigned long) * CHAR_BIT, |
1162 | lttng_alignof(unsigned long) * CHAR_BIT, | |
2694975d MD |
1163 | CTF_SPEC_MAJOR, |
1164 | CTF_SPEC_MINOR, | |
8020ceb5 | 1165 | uuid_s, |
8a98a75d | 1166 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1167 | "be" |
1168 | #else | |
1169 | "le" | |
1170 | #endif | |
1171 | ); | |
1172 | if (ret) | |
1173 | goto end; | |
1174 | ||
b020e504 | 1175 | /* ignore error, just use empty string if error. */ |
9e4d42a0 MD |
1176 | hostname[0] = '\0'; |
1177 | ret = gethostname(hostname, sizeof(hostname)); | |
1178 | if (ret && errno == ENAMETOOLONG) | |
1179 | hostname[HOST_NAME_MAX - 1] = '\0'; | |
08114193 MD |
1180 | lttng_ust_getprocname(procname); |
1181 | procname[LTTNG_UST_PROCNAME_LEN - 1] = '\0'; | |
b020e504 MD |
1182 | ret = lttng_metadata_printf(session, |
1183 | "env {\n" | |
9e4d42a0 | 1184 | " hostname = \"%s\";\n" |
b020e504 MD |
1185 | " vpid = %d;\n" |
1186 | " procname = \"%s\";\n" | |
2694975d MD |
1187 | " domain = \"ust\";\n" |
1188 | " tracer_name = \"lttng-ust\";\n" | |
1189 | " tracer_major = %u;\n" | |
1190 | " tracer_minor = %u;\n" | |
1191 | " tracer_patchlevel = %u;\n" | |
b020e504 | 1192 | "};\n\n", |
9e4d42a0 | 1193 | hostname, |
b020e504 MD |
1194 | (int) getpid(), |
1195 | procname, | |
2694975d MD |
1196 | LTTNG_UST_MAJOR_VERSION, |
1197 | LTTNG_UST_MINOR_VERSION, | |
1198 | LTTNG_UST_PATCHLEVEL_VERSION | |
b020e504 MD |
1199 | ); |
1200 | if (ret) | |
1201 | goto end; | |
1202 | ||
28b12049 MD |
1203 | ret = lttng_metadata_printf(session, |
1204 | "clock {\n" | |
939950af MD |
1205 | " name = %s;\n", |
1206 | "monotonic" | |
1207 | ); | |
1208 | if (ret) | |
1209 | goto end; | |
1210 | ||
1211 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1212 | ret = lttng_metadata_printf(session, | |
1213 | " uuid = \"%s\";\n", | |
1214 | clock_uuid_s | |
1215 | ); | |
1216 | if (ret) | |
1217 | goto end; | |
1218 | } | |
1219 | ||
1220 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1221 | " description = \"Monotonic Clock\";\n" |
1222 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1223 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1224 | " offset = %" PRIu64 ";\n" | |
1225 | "};\n\n", | |
28b12049 MD |
1226 | trace_clock_freq(), |
1227 | measure_clock_offset() | |
1228 | ); | |
1229 | if (ret) | |
1230 | goto end; | |
1231 | ||
1232 | ret = lttng_metadata_printf(session, | |
1233 | "typealias integer {\n" | |
1234 | " size = 27; align = 1; signed = false;\n" | |
1235 | " map = clock.monotonic.value;\n" | |
1236 | "} := uint27_clock_monotonic_t;\n" | |
1237 | "\n" | |
1238 | "typealias integer {\n" | |
1239 | " size = 32; align = %u; signed = false;\n" | |
1240 | " map = clock.monotonic.value;\n" | |
1241 | "} := uint32_clock_monotonic_t;\n" | |
1242 | "\n" | |
1243 | "typealias integer {\n" | |
1244 | " size = 64; align = %u; signed = false;\n" | |
1245 | " map = clock.monotonic.value;\n" | |
1246 | "} := uint64_clock_monotonic_t;\n\n", | |
1247 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1248 | lttng_alignof(uint64_t) * CHAR_BIT | |
1249 | ); | |
1250 | if (ret) | |
1251 | goto end; | |
1252 | ||
7dd08bec | 1253 | ret = _lttng_stream_packet_context_declare(session); |
8020ceb5 MD |
1254 | if (ret) |
1255 | goto end; | |
1256 | ||
7dd08bec | 1257 | ret = _lttng_event_header_declare(session); |
8020ceb5 MD |
1258 | if (ret) |
1259 | goto end; | |
1260 | ||
1261 | skip_session: | |
e58095ef | 1262 | cds_list_for_each_entry(chan, &session->chan_head, node) { |
7dd08bec | 1263 | ret = _lttng_channel_metadata_statedump(session, chan); |
8020ceb5 MD |
1264 | if (ret) |
1265 | goto end; | |
1266 | } | |
1267 | ||
e58095ef | 1268 | cds_list_for_each_entry(event, &session->events_head, node) { |
7dd08bec | 1269 | ret = _lttng_event_metadata_statedump(session, event->chan, event); |
8020ceb5 MD |
1270 | if (ret) |
1271 | goto end; | |
1272 | } | |
1273 | session->metadata_dumped = 1; | |
1274 | end: | |
1275 | return ret; | |
1276 | } | |
1277 | ||
003fedf4 | 1278 | void lttng_ust_events_exit(void) |
8020ceb5 | 1279 | { |
7dd08bec | 1280 | struct lttng_session *session, *tmpsession; |
8020ceb5 | 1281 | |
e58095ef | 1282 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, node) |
7dd08bec | 1283 | lttng_session_destroy(session); |
8020ceb5 | 1284 | } |
457a6b58 | 1285 | |
e58095ef MD |
1286 | /* |
1287 | * Enabler management. | |
1288 | */ | |
1289 | struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type, | |
1290 | struct lttng_ust_event *event_param, | |
1291 | struct lttng_channel *chan) | |
457a6b58 | 1292 | { |
e58095ef MD |
1293 | struct lttng_enabler *enabler; |
1294 | ||
1295 | enabler = zmalloc(sizeof(*enabler)); | |
1296 | if (!enabler) | |
1297 | return NULL; | |
1298 | enabler->type = type; | |
1299 | CDS_INIT_LIST_HEAD(&enabler->filter_bytecode_head); | |
1300 | memcpy(&enabler->event_param, event_param, | |
1301 | sizeof(enabler->event_param)); | |
1302 | enabler->chan = chan; | |
1303 | /* ctx left NULL */ | |
1304 | enabler->enabled = 1; | |
1305 | cds_list_add(&enabler->node, &enabler->chan->session->enablers_head); | |
1306 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1307 | return enabler; | |
457a6b58 MD |
1308 | } |
1309 | ||
e58095ef | 1310 | int lttng_enabler_enable(struct lttng_enabler *enabler) |
457a6b58 | 1311 | { |
e58095ef MD |
1312 | enabler->enabled = 1; |
1313 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1314 | return 0; | |
457a6b58 | 1315 | } |
457a6b58 | 1316 | |
e58095ef | 1317 | int lttng_enabler_disable(struct lttng_enabler *enabler) |
457a6b58 | 1318 | { |
e58095ef MD |
1319 | if (enabler->chan == enabler->chan->session->metadata) |
1320 | return -EPERM; | |
1321 | enabler->enabled = 0; | |
1322 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1323 | return 0; | |
1324 | } | |
457a6b58 | 1325 | |
e58095ef MD |
1326 | int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler, |
1327 | struct lttng_ust_filter_bytecode_node *bytecode) | |
1328 | { | |
1329 | bytecode->enabler = enabler; | |
1330 | cds_list_add_tail(&bytecode->node, &enabler->filter_bytecode_head); | |
1331 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1332 | return 0; | |
1333 | } | |
f488575f | 1334 | |
e58095ef MD |
1335 | int lttng_attach_context(struct lttng_ust_context *context_param, |
1336 | struct lttng_ctx **ctx, struct lttng_session *session) | |
1337 | { | |
457a6b58 | 1338 | /* |
e58095ef MD |
1339 | * We cannot attach a context after trace has been started for a |
1340 | * session because the metadata does not allow expressing this | |
1341 | * information outside of the original channel scope. | |
457a6b58 | 1342 | */ |
e58095ef MD |
1343 | if (session->been_active) |
1344 | return -EPERM; | |
457a6b58 | 1345 | |
e58095ef MD |
1346 | switch (context_param->ctx) { |
1347 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1348 | return lttng_add_pthread_id_to_ctx(ctx); | |
1349 | case LTTNG_UST_CONTEXT_VTID: | |
1350 | return lttng_add_vtid_to_ctx(ctx); | |
1351 | case LTTNG_UST_CONTEXT_VPID: | |
1352 | return lttng_add_vpid_to_ctx(ctx); | |
1353 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1354 | return lttng_add_procname_to_ctx(ctx); | |
1355 | default: | |
1356 | return -EINVAL; | |
457a6b58 | 1357 | } |
457a6b58 MD |
1358 | } |
1359 | ||
e58095ef MD |
1360 | int lttng_enabler_attach_context(struct lttng_enabler *enabler, |
1361 | struct lttng_ust_context *context_param) | |
457a6b58 | 1362 | { |
e58095ef MD |
1363 | #if 0 // disabled for now. |
1364 | struct lttng_session *session = enabler->chan->session; | |
1365 | int ret; | |
457a6b58 | 1366 | |
e58095ef MD |
1367 | ret = lttng_attach_context(context_param, &enabler->ctx, |
1368 | session); | |
1369 | if (ret) | |
1370 | return ret; | |
1371 | lttng_session_lazy_sync_enablers(enabler->chan->session); | |
1372 | #endif | |
1373 | return -ENOSYS; | |
457a6b58 MD |
1374 | } |
1375 | ||
e58095ef MD |
1376 | static |
1377 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
457a6b58 | 1378 | { |
e58095ef | 1379 | struct lttng_ust_filter_bytecode_node *filter_node, *tmp_filter_node; |
457a6b58 | 1380 | |
e58095ef MD |
1381 | /* Destroy filter bytecode */ |
1382 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
1383 | &enabler->filter_bytecode_head, node) { | |
1384 | free(filter_node); | |
457a6b58 | 1385 | } |
e58095ef MD |
1386 | |
1387 | /* Destroy contexts */ | |
1388 | lttng_destroy_context(enabler->ctx); | |
1389 | ||
1390 | cds_list_del(&enabler->node); | |
1391 | free(enabler); | |
457a6b58 MD |
1392 | } |
1393 | ||
e58095ef MD |
1394 | /* |
1395 | * lttng_session_sync_enablers should be called just before starting a | |
1396 | * session. | |
1397 | */ | |
457a6b58 | 1398 | static |
e58095ef | 1399 | void lttng_session_sync_enablers(struct lttng_session *session) |
457a6b58 | 1400 | { |
e58095ef MD |
1401 | struct lttng_enabler *enabler; |
1402 | struct lttng_event *event; | |
457a6b58 | 1403 | |
e58095ef MD |
1404 | cds_list_for_each_entry(enabler, &session->enablers_head, node) |
1405 | lttng_enabler_ref_events(enabler); | |
1406 | /* | |
1407 | * For each event, if at least one of its enablers is enabled, | |
1408 | * we enable the event, else we disable it. | |
1409 | */ | |
1410 | cds_list_for_each_entry(event, &session->events_head, node) { | |
1411 | struct lttng_enabler_ref *enabler_ref; | |
1412 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1413 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1414 | |
1415 | /* Enable events */ | |
1416 | cds_list_for_each_entry(enabler_ref, | |
1417 | &event->enablers_ref_head, node) { | |
1418 | if (enabler_ref->ref->enabled) { | |
1419 | enabled = 1; | |
1420 | break; | |
1421 | } | |
1422 | } | |
1423 | event->enabled = enabled; | |
457a6b58 | 1424 | |
1f49fc05 | 1425 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 MD |
1426 | cds_list_for_each_entry(enabler_ref, |
1427 | &event->enablers_ref_head, node) { | |
1f49fc05 MD |
1428 | if (enabler_ref->ref->enabled |
1429 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1430 | has_enablers_without_bytecode = 1; |
1431 | break; | |
1432 | } | |
1433 | } | |
1434 | event->has_enablers_without_bytecode = | |
1435 | has_enablers_without_bytecode; | |
1436 | ||
e58095ef MD |
1437 | /* Enable filters */ |
1438 | cds_list_for_each_entry(runtime, | |
1439 | &event->bytecode_runtime_head, node) { | |
1440 | lttng_filter_sync_state(runtime); | |
457a6b58 MD |
1441 | } |
1442 | } | |
457a6b58 MD |
1443 | } |
1444 | ||
e58095ef MD |
1445 | /* |
1446 | * Apply enablers to session events, adding events to session if need | |
1447 | * be. It is required after each modification applied to an active | |
1448 | * session, and right before session "start". | |
1449 | * "lazy" sync means we only sync if required. | |
1450 | */ | |
1451 | static | |
1452 | void lttng_session_lazy_sync_enablers(struct lttng_session *session) | |
457a6b58 | 1453 | { |
e58095ef MD |
1454 | /* We can skip if session is not active */ |
1455 | if (!session->active) | |
1456 | return; | |
1457 | lttng_session_sync_enablers(session); | |
457a6b58 | 1458 | } |