Commit | Line | Data |
---|---|---|
8020ceb5 MD |
1 | /* |
2 | * ltt-events.c | |
3 | * | |
8020ceb5 MD |
4 | * Holds LTTng per-session event registry. |
5 | * | |
e92f3e28 MD |
6 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
7 | * | |
8 | * This library is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; only | |
11 | * version 2.1 of the License. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with this library; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
8020ceb5 MD |
21 | */ |
22 | ||
b5234c06 MD |
23 | #define _GNU_SOURCE |
24 | #include <stdio.h> | |
25 | #include <urcu/list.h> | |
8165c8da | 26 | #include <urcu/hlist.h> |
b5234c06 | 27 | #include <pthread.h> |
b5234c06 | 28 | #include <errno.h> |
f4681817 MD |
29 | #include <sys/shm.h> |
30 | #include <sys/ipc.h> | |
44c72f10 MD |
31 | #include <stdint.h> |
32 | #include <stddef.h> | |
28b12049 MD |
33 | #include <inttypes.h> |
34 | #include <time.h> | |
2ae57758 | 35 | #include <lttng/ust-endian.h> |
28b12049 | 36 | #include "clock.h" |
44c72f10 MD |
37 | |
38 | #include <urcu-bp.h> | |
39 | #include <urcu/compiler.h> | |
40 | #include <urcu/uatomic.h> | |
41 | #include <urcu/arch.h> | |
42 | ||
43 | #include <lttng/tracepoint.h> | |
4318ae1b | 44 | #include <lttng/ust-events.h> |
44c72f10 MD |
45 | |
46 | #include <usterr-signal-safe.h> | |
47 | #include <helper.h> | |
1f18504e | 48 | #include "error.h" |
08114193 | 49 | #include "compat.h" |
eda498b8 | 50 | #include "lttng-ust-uuid.h" |
44c72f10 | 51 | |
457a6b58 | 52 | #include "tracepoint-internal.h" |
8020ceb5 | 53 | #include "ltt-tracer.h" |
8165c8da | 54 | #include "ltt-tracer-core.h" |
b728d87e | 55 | #include "wait.h" |
8d8a24c8 | 56 | #include "../libringbuffer/shm.h" |
596c4223 | 57 | #include "jhash.h" |
8165c8da MD |
58 | |
59 | /* | |
60 | * The sessions mutex is the centralized mutex across UST tracing | |
17dfb34b MD |
61 | * control and probe registration. All operations within this file are |
62 | * called by the communication thread, under ust_lock protection. | |
8165c8da | 63 | */ |
2b2d6ff7 | 64 | static pthread_mutex_t sessions_mutex = PTHREAD_MUTEX_INITIALIZER; |
8165c8da | 65 | |
17dfb34b | 66 | void ust_lock(void) |
8165c8da MD |
67 | { |
68 | pthread_mutex_lock(&sessions_mutex); | |
69 | } | |
70 | ||
17dfb34b | 71 | void ust_unlock(void) |
8165c8da MD |
72 | { |
73 | pthread_mutex_unlock(&sessions_mutex); | |
74 | } | |
75 | ||
b5234c06 | 76 | static CDS_LIST_HEAD(sessions); |
8165c8da | 77 | |
457a6b58 MD |
78 | /* |
79 | * Wildcard list, containing the active wildcards. | |
80 | * Protected by ust lock. | |
81 | */ | |
82 | static CDS_LIST_HEAD(wildcard_list); | |
83 | ||
8165c8da MD |
84 | /* |
85 | * Pending probes hash table, containing the registered ltt events for | |
86 | * which tracepoint probes are still missing. Protected by the sessions | |
87 | * mutex. | |
88 | */ | |
89 | #define PENDING_PROBE_HASH_BITS 6 | |
90 | #define PENDING_PROBE_HASH_SIZE (1 << PENDING_PROBE_HASH_BITS) | |
91 | static struct cds_hlist_head pending_probe_table[PENDING_PROBE_HASH_SIZE]; | |
92 | ||
93 | struct ust_pending_probe { | |
94 | struct ltt_event *event; | |
95 | struct cds_hlist_node node; | |
457a6b58 MD |
96 | enum lttng_ust_loglevel_type loglevel_type; |
97 | int loglevel; | |
8165c8da MD |
98 | char name[]; |
99 | }; | |
8020ceb5 MD |
100 | |
101 | static void _ltt_event_destroy(struct ltt_event *event); | |
e6c12e3d | 102 | static void _ltt_wildcard_destroy(struct session_wildcard *sw); |
8020ceb5 MD |
103 | static void _ltt_channel_destroy(struct ltt_channel *chan); |
104 | static int _ltt_event_unregister(struct ltt_event *event); | |
105 | static | |
106 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
107 | struct ltt_channel *chan, | |
108 | struct ltt_event *event); | |
109 | static | |
110 | int _ltt_session_metadata_statedump(struct ltt_session *session); | |
111 | ||
457a6b58 MD |
112 | int ltt_loglevel_match(const struct lttng_event_desc *desc, |
113 | enum lttng_ust_loglevel_type req_type, | |
114 | int req_loglevel) | |
115 | { | |
116 | int ev_loglevel; | |
117 | ||
118 | if (req_type == LTTNG_UST_LOGLEVEL_ALL) | |
119 | return 1; | |
120 | if (!desc->loglevel) | |
121 | ev_loglevel = TRACE_DEFAULT; | |
122 | else | |
123 | ev_loglevel = *(*desc->loglevel); | |
124 | switch (req_type) { | |
125 | case LTTNG_UST_LOGLEVEL_RANGE: | |
126 | if (ev_loglevel <= req_loglevel || req_loglevel == -1) | |
127 | return 1; | |
128 | else | |
129 | return 0; | |
130 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
131 | if (ev_loglevel == req_loglevel || req_loglevel == -1) | |
132 | return 1; | |
133 | else | |
134 | return 0; | |
135 | case LTTNG_UST_LOGLEVEL_ALL: | |
136 | default: | |
137 | return 1; | |
138 | } | |
139 | } | |
140 | ||
141 | /* | |
142 | * Return wildcard for a given event name if the event name match the | |
143 | * one of the wildcards. | |
144 | * Must be called with ust lock held. | |
145 | * Returns NULL if not present. | |
146 | */ | |
147 | static | |
148 | struct wildcard_entry *match_wildcard(const struct lttng_event_desc *desc) | |
149 | { | |
150 | struct wildcard_entry *e; | |
151 | ||
152 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
153 | /* If only contain '*' */ | |
154 | if (strlen(e->name) == 1) | |
155 | goto possible_match; | |
156 | /* Compare excluding final '*' */ | |
157 | if (!strncmp(desc->name, e->name, strlen(e->name) - 1)) | |
158 | goto possible_match; | |
159 | continue; /* goto next, no match */ | |
160 | possible_match: | |
161 | if (ltt_loglevel_match(desc, | |
162 | e->loglevel_type, | |
163 | e->loglevel)) { | |
164 | return e; | |
165 | } | |
166 | /* no match, loop to next */ | |
167 | } | |
168 | return NULL; | |
169 | } | |
170 | ||
8165c8da MD |
171 | /* |
172 | * called at event creation if probe is missing. | |
173 | * called with session mutex held. | |
174 | */ | |
175 | static | |
457a6b58 MD |
176 | int add_pending_probe(struct ltt_event *event, const char *name, |
177 | enum lttng_ust_loglevel_type loglevel_type, | |
178 | int loglevel) | |
8165c8da MD |
179 | { |
180 | struct cds_hlist_head *head; | |
8165c8da | 181 | struct ust_pending_probe *e; |
48bf7c27 | 182 | size_t name_len = strlen(name) + 1; |
ff412fb5 | 183 | uint32_t hash; |
8165c8da | 184 | |
48bf7c27 MD |
185 | if (name_len > LTTNG_UST_SYM_NAME_LEN) { |
186 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN); | |
187 | name_len = LTTNG_UST_SYM_NAME_LEN; | |
ff412fb5 | 188 | } |
48bf7c27 | 189 | hash = jhash(name, name_len - 1, 0); |
8165c8da MD |
190 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
191 | e = zmalloc(sizeof(struct ust_pending_probe) + name_len); | |
192 | if (!e) | |
193 | return -ENOMEM; | |
48bf7c27 MD |
194 | memcpy(&e->name[0], name, name_len); |
195 | e->name[name_len - 1] = '\0'; | |
457a6b58 MD |
196 | e->loglevel_type = loglevel_type; |
197 | e->loglevel = loglevel; | |
8165c8da MD |
198 | cds_hlist_add_head(&e->node, head); |
199 | e->event = event; | |
200 | event->pending_probe = e; | |
201 | return 0; | |
202 | } | |
203 | ||
204 | /* | |
205 | * remove a pending probe. called when at event teardown and when an | |
206 | * event is fixed (probe is loaded). | |
207 | * called with session mutex held. | |
208 | */ | |
209 | static | |
210 | void remove_pending_probe(struct ust_pending_probe *e) | |
211 | { | |
212 | if (!e) | |
213 | return; | |
214 | cds_hlist_del(&e->node); | |
215 | free(e); | |
216 | } | |
217 | ||
218 | /* | |
219 | * Called at library load: connect the probe on the events pending on | |
220 | * probe load. | |
221 | * called with session mutex held. | |
222 | */ | |
223 | int pending_probe_fix_events(const struct lttng_event_desc *desc) | |
224 | { | |
225 | struct cds_hlist_head *head; | |
226 | struct cds_hlist_node *node, *p; | |
227 | struct ust_pending_probe *e; | |
228 | const char *name = desc->name; | |
8165c8da | 229 | int ret = 0; |
7ee3cc56 | 230 | struct lttng_ust_event event_param; |
48bf7c27 | 231 | size_t name_len = strlen(name) + 1; |
ff412fb5 | 232 | uint32_t hash; |
8165c8da | 233 | |
e6c12e3d MD |
234 | /* Wildcard */ |
235 | { | |
236 | struct wildcard_entry *wildcard; | |
237 | ||
457a6b58 | 238 | wildcard = match_wildcard(desc); |
e6c12e3d MD |
239 | if (strcmp(desc->name, "lttng_ust:metadata") && wildcard) { |
240 | struct session_wildcard *sw; | |
241 | ||
242 | cds_list_for_each_entry(sw, &wildcard->session_list, | |
243 | session_list) { | |
244 | struct ltt_event *ev; | |
245 | int ret; | |
246 | ||
247 | memcpy(&event_param, &sw->event_param, | |
248 | sizeof(event_param)); | |
249 | memcpy(event_param.name, | |
250 | desc->name, | |
251 | sizeof(event_param.name)); | |
252 | /* create event */ | |
253 | ret = ltt_event_create(sw->chan, | |
254 | &event_param, NULL, | |
255 | &ev); | |
256 | if (ret) { | |
257 | DBG("Error creating event"); | |
258 | continue; | |
259 | } | |
260 | cds_list_add(&ev->wildcard_list, | |
261 | &sw->events); | |
262 | } | |
263 | } | |
264 | } | |
265 | ||
48bf7c27 MD |
266 | if (name_len > LTTNG_UST_SYM_NAME_LEN) { |
267 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN); | |
268 | name_len = LTTNG_UST_SYM_NAME_LEN; | |
ff412fb5 | 269 | } |
48bf7c27 | 270 | hash = jhash(name, name_len - 1, 0); |
8165c8da MD |
271 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
272 | cds_hlist_for_each_entry_safe(e, node, p, head, node) { | |
273 | struct ltt_event *event; | |
274 | struct ltt_channel *chan; | |
275 | ||
fe2d02f4 | 276 | if (!ltt_loglevel_match(desc, |
457a6b58 MD |
277 | e->loglevel_type, |
278 | e->loglevel)) { | |
279 | continue; | |
280 | } | |
281 | if (strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) { | |
282 | continue; | |
283 | } | |
fe2d02f4 | 284 | event = e->event; |
8165c8da MD |
285 | chan = event->chan; |
286 | assert(!event->desc); | |
287 | event->desc = desc; | |
288 | event->pending_probe = NULL; | |
289 | remove_pending_probe(e); | |
290 | ret |= __tracepoint_probe_register(name, | |
291 | event->desc->probe_callback, | |
67e5f391 | 292 | event, event->desc->signature); |
636c5aa4 MD |
293 | if (ret) |
294 | continue; | |
295 | event->id = chan->free_event_id++; | |
8165c8da MD |
296 | ret |= _ltt_event_metadata_statedump(chan->session, chan, |
297 | event); | |
298 | } | |
299 | return ret; | |
300 | } | |
301 | ||
8020ceb5 MD |
302 | void synchronize_trace(void) |
303 | { | |
8020ceb5 | 304 | synchronize_rcu(); |
8020ceb5 MD |
305 | } |
306 | ||
307 | struct ltt_session *ltt_session_create(void) | |
308 | { | |
309 | struct ltt_session *session; | |
19d8b1b3 | 310 | int ret; |
8020ceb5 | 311 | |
b5234c06 | 312 | session = zmalloc(sizeof(struct ltt_session)); |
8020ceb5 MD |
313 | if (!session) |
314 | return NULL; | |
b5234c06 MD |
315 | CDS_INIT_LIST_HEAD(&session->chan); |
316 | CDS_INIT_LIST_HEAD(&session->events); | |
e6c12e3d | 317 | CDS_INIT_LIST_HEAD(&session->wildcards); |
19d8b1b3 MD |
318 | ret = lttng_ust_uuid_generate(session->uuid); |
319 | if (ret != 0) { | |
320 | session->uuid[0] = '\0'; | |
321 | } | |
b5234c06 | 322 | cds_list_add(&session->list, &sessions); |
8020ceb5 MD |
323 | return session; |
324 | } | |
325 | ||
326 | void ltt_session_destroy(struct ltt_session *session) | |
327 | { | |
328 | struct ltt_channel *chan, *tmpchan; | |
329 | struct ltt_event *event, *tmpevent; | |
e6c12e3d | 330 | struct session_wildcard *wildcard, *tmpwildcard; |
8020ceb5 MD |
331 | int ret; |
332 | ||
b5234c06 MD |
333 | CMM_ACCESS_ONCE(session->active) = 0; |
334 | cds_list_for_each_entry(event, &session->events, list) { | |
8020ceb5 MD |
335 | ret = _ltt_event_unregister(event); |
336 | WARN_ON(ret); | |
337 | } | |
338 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e6c12e3d MD |
339 | cds_list_for_each_entry_safe(wildcard, tmpwildcard, &session->wildcards, list) |
340 | _ltt_wildcard_destroy(wildcard); | |
b5234c06 | 341 | cds_list_for_each_entry_safe(event, tmpevent, &session->events, list) |
8020ceb5 | 342 | _ltt_event_destroy(event); |
b5234c06 | 343 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list) |
8020ceb5 | 344 | _ltt_channel_destroy(chan); |
b5234c06 | 345 | cds_list_del(&session->list); |
b5234c06 | 346 | free(session); |
8020ceb5 MD |
347 | } |
348 | ||
976fe9ea | 349 | int ltt_session_enable(struct ltt_session *session) |
8020ceb5 MD |
350 | { |
351 | int ret = 0; | |
352 | struct ltt_channel *chan; | |
353 | ||
8020ceb5 MD |
354 | if (session->active) { |
355 | ret = -EBUSY; | |
356 | goto end; | |
357 | } | |
358 | ||
359 | /* | |
360 | * Snapshot the number of events per channel to know the type of header | |
361 | * we need to use. | |
362 | */ | |
b5234c06 | 363 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
364 | if (chan->header_type) |
365 | continue; /* don't change it if session stop/restart */ | |
366 | if (chan->free_event_id < 31) | |
367 | chan->header_type = 1; /* compact */ | |
368 | else | |
369 | chan->header_type = 2; /* large */ | |
370 | } | |
371 | ||
b5234c06 MD |
372 | CMM_ACCESS_ONCE(session->active) = 1; |
373 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
8020ceb5 | 374 | ret = _ltt_session_metadata_statedump(session); |
4b4de73e | 375 | if (ret) |
b5234c06 | 376 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 377 | end: |
8020ceb5 MD |
378 | return ret; |
379 | } | |
380 | ||
976fe9ea | 381 | int ltt_session_disable(struct ltt_session *session) |
8020ceb5 MD |
382 | { |
383 | int ret = 0; | |
384 | ||
8020ceb5 MD |
385 | if (!session->active) { |
386 | ret = -EBUSY; | |
387 | goto end; | |
388 | } | |
b5234c06 | 389 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 390 | end: |
8020ceb5 MD |
391 | return ret; |
392 | } | |
393 | ||
976fe9ea MD |
394 | int ltt_channel_enable(struct ltt_channel *channel) |
395 | { | |
396 | int old; | |
397 | ||
9beb36ba MD |
398 | if (channel == channel->session->metadata) |
399 | return -EPERM; | |
b5234c06 | 400 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
401 | if (old) |
402 | return -EEXIST; | |
403 | return 0; | |
404 | } | |
405 | ||
406 | int ltt_channel_disable(struct ltt_channel *channel) | |
407 | { | |
408 | int old; | |
409 | ||
9beb36ba MD |
410 | if (channel == channel->session->metadata) |
411 | return -EPERM; | |
b5234c06 | 412 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
413 | if (!old) |
414 | return -EEXIST; | |
415 | return 0; | |
416 | } | |
417 | ||
418 | int ltt_event_enable(struct ltt_event *event) | |
419 | { | |
420 | int old; | |
421 | ||
9beb36ba MD |
422 | if (event->chan == event->chan->session->metadata) |
423 | return -EPERM; | |
b5234c06 | 424 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
425 | if (old) |
426 | return -EEXIST; | |
427 | return 0; | |
428 | } | |
429 | ||
430 | int ltt_event_disable(struct ltt_event *event) | |
431 | { | |
432 | int old; | |
433 | ||
9beb36ba MD |
434 | if (event->chan == event->chan->session->metadata) |
435 | return -EPERM; | |
b5234c06 | 436 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
437 | if (!old) |
438 | return -EEXIST; | |
439 | return 0; | |
440 | } | |
441 | ||
8020ceb5 MD |
442 | struct ltt_channel *ltt_channel_create(struct ltt_session *session, |
443 | const char *transport_name, | |
444 | void *buf_addr, | |
445 | size_t subbuf_size, size_t num_subbuf, | |
446 | unsigned int switch_timer_interval, | |
193183fb | 447 | unsigned int read_timer_interval, |
ef9ff354 MD |
448 | int **shm_fd, int **wait_fd, |
449 | uint64_t **memory_map_size, | |
d028eddb | 450 | struct ltt_channel *chan_priv_init) |
8020ceb5 | 451 | { |
a3f61e7f | 452 | struct ltt_channel *chan = NULL; |
8020ceb5 MD |
453 | struct ltt_transport *transport; |
454 | ||
8020ceb5 MD |
455 | if (session->been_active) |
456 | goto active; /* Refuse to add channel to active session */ | |
457 | transport = ltt_transport_find(transport_name); | |
458 | if (!transport) { | |
b5234c06 | 459 | DBG("LTTng transport %s not found\n", |
8020ceb5 MD |
460 | transport_name); |
461 | goto notransport; | |
462 | } | |
d028eddb MD |
463 | chan_priv_init->id = session->free_chan_id++; |
464 | chan_priv_init->session = session; | |
8020ceb5 MD |
465 | /* |
466 | * Note: the channel creation op already writes into the packet | |
467 | * headers. Therefore the "chan" information used as input | |
468 | * should be already accessible. | |
469 | */ | |
e7372d13 | 470 | chan = transport->ops.channel_create(transport_name, buf_addr, |
8020ceb5 | 471 | subbuf_size, num_subbuf, switch_timer_interval, |
193183fb | 472 | read_timer_interval, shm_fd, wait_fd, |
d028eddb | 473 | memory_map_size, chan_priv_init); |
a3f61e7f | 474 | if (!chan) |
8020ceb5 | 475 | goto create_error; |
976fe9ea | 476 | chan->enabled = 1; |
8020ceb5 | 477 | chan->ops = &transport->ops; |
b5234c06 | 478 | cds_list_add(&chan->list, &session->chan); |
8020ceb5 MD |
479 | return chan; |
480 | ||
481 | create_error: | |
8020ceb5 MD |
482 | notransport: |
483 | active: | |
8020ceb5 MD |
484 | return NULL; |
485 | } | |
486 | ||
487 | /* | |
488 | * Only used internally at session destruction. | |
489 | */ | |
490 | static | |
491 | void _ltt_channel_destroy(struct ltt_channel *chan) | |
492 | { | |
b5234c06 | 493 | cds_list_del(&chan->list); |
8020ceb5 | 494 | lttng_destroy_context(chan->ctx); |
a3f61e7f | 495 | chan->ops->channel_destroy(chan); |
8020ceb5 MD |
496 | } |
497 | ||
498 | /* | |
499 | * Supports event creation while tracing session is active. | |
500 | */ | |
576599a0 MD |
501 | int ltt_event_create(struct ltt_channel *chan, |
502 | struct lttng_ust_event *event_param, | |
503 | void *filter, | |
504 | struct ltt_event **_event) | |
8020ceb5 | 505 | { |
457a6b58 | 506 | const struct lttng_event_desc *desc = NULL; /* silence gcc */ |
8020ceb5 | 507 | struct ltt_event *event; |
576599a0 | 508 | int ret = 0; |
8020ceb5 | 509 | |
38eb0baa | 510 | if (chan->used_event_id == -1U) { |
576599a0 | 511 | ret = -ENOMEM; |
8020ceb5 | 512 | goto full; |
576599a0 | 513 | } |
8020ceb5 MD |
514 | /* |
515 | * This is O(n^2) (for each event, the loop is called at event | |
516 | * creation). Might require a hash if we have lots of events. | |
517 | */ | |
576599a0 | 518 | cds_list_for_each_entry(event, &chan->session->events, list) { |
ff412fb5 MD |
519 | if (event->desc && !strncmp(event->desc->name, |
520 | event_param->name, | |
521 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
576599a0 | 522 | ret = -EEXIST; |
8020ceb5 | 523 | goto exist; |
576599a0 MD |
524 | } |
525 | } | |
457a6b58 MD |
526 | |
527 | /* | |
528 | * Check if loglevel match. Refuse to connect event if not. | |
529 | */ | |
530 | if (event_param->instrumentation == LTTNG_UST_TRACEPOINT) { | |
531 | desc = ltt_event_get(event_param->name); | |
fe2d02f4 MD |
532 | if (desc) { |
533 | if (!ltt_loglevel_match(desc, | |
534 | event_param->loglevel_type, | |
535 | event_param->loglevel)) { | |
536 | ret = -EPERM; | |
537 | goto no_loglevel_match; | |
538 | } | |
457a6b58 | 539 | } |
fe2d02f4 MD |
540 | /* |
541 | * If descriptor is not there, it will be added to | |
542 | * pending probes. | |
543 | */ | |
457a6b58 | 544 | } |
b5234c06 | 545 | event = zmalloc(sizeof(struct ltt_event)); |
576599a0 MD |
546 | if (!event) { |
547 | ret = -ENOMEM; | |
8020ceb5 | 548 | goto cache_error; |
576599a0 | 549 | } |
8020ceb5 MD |
550 | event->chan = chan; |
551 | event->filter = filter; | |
8165c8da MD |
552 | /* |
553 | * used_event_id counts the maximum number of event IDs that can | |
554 | * register if all probes register. | |
555 | */ | |
556 | chan->used_event_id++; | |
976fe9ea | 557 | event->enabled = 1; |
8020ceb5 MD |
558 | event->instrumentation = event_param->instrumentation; |
559 | /* Populate ltt_event structure before tracepoint registration. */ | |
b5234c06 | 560 | cmm_smp_wmb(); |
8020ceb5 | 561 | switch (event_param->instrumentation) { |
b5234c06 | 562 | case LTTNG_UST_TRACEPOINT: |
457a6b58 | 563 | event->desc = desc; |
8165c8da MD |
564 | if (event->desc) { |
565 | ret = __tracepoint_probe_register(event_param->name, | |
566 | event->desc->probe_callback, | |
67e5f391 | 567 | event, event->desc->signature); |
8165c8da MD |
568 | if (ret) |
569 | goto register_error; | |
570 | event->id = chan->free_event_id++; | |
571 | } else { | |
572 | /* | |
573 | * If the probe is not present, event->desc stays NULL, | |
574 | * waiting for the probe to register, and the event->id | |
575 | * stays unallocated. | |
576 | */ | |
457a6b58 MD |
577 | ret = add_pending_probe(event, event_param->name, |
578 | event_param->loglevel_type, | |
579 | event_param->loglevel); | |
8165c8da MD |
580 | if (ret) |
581 | goto add_pending_error; | |
582 | } | |
8020ceb5 | 583 | break; |
8020ceb5 MD |
584 | default: |
585 | WARN_ON_ONCE(1); | |
586 | } | |
8165c8da MD |
587 | if (event->desc) { |
588 | ret = _ltt_event_metadata_statedump(chan->session, chan, event); | |
589 | if (ret) | |
590 | goto statedump_error; | |
591 | } | |
b5234c06 | 592 | cds_list_add(&event->list, &chan->session->events); |
576599a0 MD |
593 | *_event = event; |
594 | return 0; | |
8020ceb5 MD |
595 | |
596 | statedump_error: | |
8165c8da MD |
597 | if (event->desc) { |
598 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_param->name, | |
599 | event->desc->probe_callback, | |
600 | event)); | |
601 | ltt_event_put(event->desc); | |
602 | } | |
603 | add_pending_error: | |
8020ceb5 | 604 | register_error: |
b5234c06 | 605 | free(event); |
8020ceb5 | 606 | cache_error: |
457a6b58 | 607 | no_loglevel_match: |
8020ceb5 MD |
608 | exist: |
609 | full: | |
576599a0 | 610 | return ret; |
8020ceb5 MD |
611 | } |
612 | ||
613 | /* | |
614 | * Only used internally at session destruction. | |
615 | */ | |
616 | int _ltt_event_unregister(struct ltt_event *event) | |
617 | { | |
618 | int ret = -EINVAL; | |
619 | ||
620 | switch (event->instrumentation) { | |
b5234c06 | 621 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
622 | if (event->desc) { |
623 | ret = __tracepoint_probe_unregister(event->desc->name, | |
624 | event->desc->probe_callback, | |
625 | event); | |
626 | if (ret) | |
627 | return ret; | |
628 | } else { | |
629 | remove_pending_probe(event->pending_probe); | |
630 | ret = 0; | |
631 | } | |
8020ceb5 | 632 | break; |
8020ceb5 MD |
633 | default: |
634 | WARN_ON_ONCE(1); | |
635 | } | |
636 | return ret; | |
637 | } | |
638 | ||
639 | /* | |
640 | * Only used internally at session destruction. | |
641 | */ | |
642 | static | |
643 | void _ltt_event_destroy(struct ltt_event *event) | |
644 | { | |
645 | switch (event->instrumentation) { | |
b5234c06 | 646 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
647 | if (event->desc) { |
648 | ltt_event_put(event->desc); | |
649 | } | |
8020ceb5 | 650 | break; |
8020ceb5 MD |
651 | default: |
652 | WARN_ON_ONCE(1); | |
653 | } | |
b5234c06 | 654 | cds_list_del(&event->list); |
8020ceb5 | 655 | lttng_destroy_context(event->ctx); |
b5234c06 | 656 | free(event); |
8020ceb5 MD |
657 | } |
658 | ||
659 | /* | |
660 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 661 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
662 | * remaining space left in packet and write, since mutual exclusion |
663 | * protects us from concurrent writes. | |
664 | */ | |
665 | int lttng_metadata_printf(struct ltt_session *session, | |
666 | const char *fmt, ...) | |
667 | { | |
4cfec15c | 668 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
8020ceb5 | 669 | struct ltt_channel *chan = session->metadata; |
b5234c06 | 670 | char *str = NULL; |
8020ceb5 MD |
671 | int ret = 0, waitret; |
672 | size_t len, reserve_len, pos; | |
673 | va_list ap; | |
674 | ||
b5234c06 | 675 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
676 | |
677 | va_start(ap, fmt); | |
b5234c06 | 678 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 679 | va_end(ap); |
b5234c06 | 680 | if (ret < 0) |
8020ceb5 MD |
681 | return -ENOMEM; |
682 | ||
683 | len = strlen(str); | |
684 | pos = 0; | |
685 | ||
686 | for (pos = 0; pos < len; pos += reserve_len) { | |
687 | reserve_len = min_t(size_t, | |
1d498196 | 688 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
689 | len - pos); |
690 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 691 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
692 | /* |
693 | * We don't care about metadata buffer's records lost | |
694 | * count, because we always retry here. Report error if | |
695 | * we need to bail out after timeout or being | |
696 | * interrupted. | |
697 | */ | |
b5234c06 | 698 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
699 | ({ |
700 | ret = chan->ops->event_reserve(&ctx, 0); | |
701 | ret != -ENOBUFS || !ret; | |
702 | }), | |
b5234c06 | 703 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 704 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
705 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
706 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 707 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 708 | if (waitret == -EINTR) |
8020ceb5 MD |
709 | ret = waitret; |
710 | goto end; | |
711 | } | |
712 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
713 | chan->ops->event_commit(&ctx); | |
714 | } | |
715 | end: | |
b5234c06 | 716 | free(str); |
8020ceb5 MD |
717 | return ret; |
718 | } | |
719 | ||
720 | static | |
721 | int _ltt_field_statedump(struct ltt_session *session, | |
722 | const struct lttng_event_field *field) | |
723 | { | |
724 | int ret = 0; | |
725 | ||
726 | switch (field->type.atype) { | |
727 | case atype_integer: | |
728 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 729 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
730 | field->type.u.basic.integer.size, |
731 | field->type.u.basic.integer.alignment, | |
732 | field->type.u.basic.integer.signedness, | |
733 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
734 | ? "none" | |
735 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
736 | ? "UTF8" | |
737 | : "ASCII", | |
738 | field->type.u.basic.integer.base, | |
8a98a75d | 739 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
740 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
741 | #else | |
742 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
743 | #endif | |
744 | field->name); | |
745 | break; | |
746 | case atype_float: | |
747 | ret = lttng_metadata_printf(session, | |
8a98a75d | 748 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
749 | field->type.u.basic._float.exp_dig, |
750 | field->type.u.basic._float.mant_dig, | |
751 | field->type.u.basic._float.alignment, | |
8a98a75d | 752 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
753 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
754 | #else | |
755 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
756 | #endif | |
757 | field->name); | |
758 | break; | |
759 | case atype_enum: | |
760 | ret = lttng_metadata_printf(session, | |
761 | " %s %s;\n", | |
762 | field->type.u.basic.enumeration.name, | |
763 | field->name); | |
764 | break; | |
765 | case atype_array: | |
766 | { | |
767 | const struct lttng_basic_type *elem_type; | |
768 | ||
769 | elem_type = &field->type.u.array.elem_type; | |
770 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 771 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
772 | elem_type->u.basic.integer.size, |
773 | elem_type->u.basic.integer.alignment, | |
774 | elem_type->u.basic.integer.signedness, | |
775 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
776 | ? "none" | |
777 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
778 | ? "UTF8" | |
779 | : "ASCII", | |
780 | elem_type->u.basic.integer.base, | |
8a98a75d | 781 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
782 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
783 | #else | |
784 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
785 | #endif | |
786 | field->name, field->type.u.array.length); | |
787 | break; | |
788 | } | |
789 | case atype_sequence: | |
790 | { | |
791 | const struct lttng_basic_type *elem_type; | |
792 | const struct lttng_basic_type *length_type; | |
793 | ||
794 | elem_type = &field->type.u.sequence.elem_type; | |
795 | length_type = &field->type.u.sequence.length_type; | |
796 | ret = lttng_metadata_printf(session, | |
797 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
798 | length_type->u.basic.integer.size, | |
799 | (unsigned int) length_type->u.basic.integer.alignment, | |
800 | length_type->u.basic.integer.signedness, | |
801 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
802 | ? "none" | |
803 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
804 | ? "UTF8" | |
805 | : "ASCII"), | |
806 | length_type->u.basic.integer.base, | |
8a98a75d | 807 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
808 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
809 | #else | |
810 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
811 | #endif | |
812 | field->name); | |
813 | if (ret) | |
814 | return ret; | |
815 | ||
816 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 817 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
818 | elem_type->u.basic.integer.size, |
819 | (unsigned int) elem_type->u.basic.integer.alignment, | |
820 | elem_type->u.basic.integer.signedness, | |
821 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
822 | ? "none" | |
823 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
824 | ? "UTF8" | |
825 | : "ASCII"), | |
826 | elem_type->u.basic.integer.base, | |
8a98a75d | 827 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
828 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
829 | #else | |
830 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
831 | #endif | |
832 | field->name, | |
833 | field->name); | |
834 | break; | |
835 | } | |
836 | ||
837 | case atype_string: | |
838 | /* Default encoding is UTF8 */ | |
839 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 840 | " string%s _%s;\n", |
8020ceb5 MD |
841 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
842 | " { encoding = ASCII; }" : "", | |
843 | field->name); | |
844 | break; | |
845 | default: | |
846 | WARN_ON_ONCE(1); | |
847 | return -EINVAL; | |
848 | } | |
849 | return ret; | |
850 | } | |
851 | ||
852 | static | |
853 | int _ltt_context_metadata_statedump(struct ltt_session *session, | |
854 | struct lttng_ctx *ctx) | |
855 | { | |
856 | int ret = 0; | |
857 | int i; | |
858 | ||
859 | if (!ctx) | |
860 | return 0; | |
861 | for (i = 0; i < ctx->nr_fields; i++) { | |
862 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
863 | ||
864 | ret = _ltt_field_statedump(session, &field->event_field); | |
865 | if (ret) | |
866 | return ret; | |
867 | } | |
868 | return ret; | |
869 | } | |
870 | ||
871 | static | |
872 | int _ltt_fields_metadata_statedump(struct ltt_session *session, | |
873 | struct ltt_event *event) | |
874 | { | |
875 | const struct lttng_event_desc *desc = event->desc; | |
876 | int ret = 0; | |
877 | int i; | |
878 | ||
879 | for (i = 0; i < desc->nr_fields; i++) { | |
880 | const struct lttng_event_field *field = &desc->fields[i]; | |
881 | ||
882 | ret = _ltt_field_statedump(session, field); | |
883 | if (ret) | |
884 | return ret; | |
885 | } | |
886 | return ret; | |
887 | } | |
888 | ||
889 | static | |
890 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
891 | struct ltt_channel *chan, | |
892 | struct ltt_event *event) | |
893 | { | |
894 | int ret = 0; | |
8155c5e8 | 895 | int loglevel = TRACE_DEFAULT; |
8020ceb5 | 896 | |
b5234c06 | 897 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
898 | return 0; |
899 | if (chan == session->metadata) | |
900 | return 0; | |
8165c8da MD |
901 | /* |
902 | * Don't print events for which probe load is pending. | |
903 | */ | |
904 | if (!event->desc) | |
905 | return 0; | |
8020ceb5 MD |
906 | |
907 | ret = lttng_metadata_printf(session, | |
908 | "event {\n" | |
7083f0fe | 909 | " name = \"%s\";\n" |
8020ceb5 MD |
910 | " id = %u;\n" |
911 | " stream_id = %u;\n", | |
912 | event->desc->name, | |
913 | event->id, | |
914 | event->chan->id); | |
915 | if (ret) | |
916 | goto end; | |
917 | ||
8155c5e8 MD |
918 | if (event->desc->loglevel) |
919 | loglevel = *(*event->desc->loglevel); | |
920 | ||
921 | ret = lttng_metadata_printf(session, | |
922 | " loglevel = %d;\n", | |
923 | loglevel); | |
924 | if (ret) | |
925 | goto end; | |
e6c12e3d | 926 | |
8020ceb5 MD |
927 | if (event->ctx) { |
928 | ret = lttng_metadata_printf(session, | |
929 | " context := struct {\n"); | |
930 | if (ret) | |
931 | goto end; | |
932 | } | |
933 | ret = _ltt_context_metadata_statedump(session, event->ctx); | |
934 | if (ret) | |
935 | goto end; | |
936 | if (event->ctx) { | |
937 | ret = lttng_metadata_printf(session, | |
938 | " };\n"); | |
939 | if (ret) | |
940 | goto end; | |
941 | } | |
942 | ||
943 | ret = lttng_metadata_printf(session, | |
944 | " fields := struct {\n" | |
945 | ); | |
946 | if (ret) | |
947 | goto end; | |
948 | ||
949 | ret = _ltt_fields_metadata_statedump(session, event); | |
950 | if (ret) | |
951 | goto end; | |
952 | ||
953 | /* | |
954 | * LTTng space reservation can only reserve multiples of the | |
955 | * byte size. | |
956 | */ | |
957 | ret = lttng_metadata_printf(session, | |
958 | " };\n" | |
959 | "};\n\n"); | |
960 | if (ret) | |
961 | goto end; | |
962 | ||
963 | event->metadata_dumped = 1; | |
964 | end: | |
965 | return ret; | |
966 | ||
967 | } | |
968 | ||
969 | static | |
970 | int _ltt_channel_metadata_statedump(struct ltt_session *session, | |
971 | struct ltt_channel *chan) | |
972 | { | |
973 | int ret = 0; | |
974 | ||
b5234c06 | 975 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
976 | return 0; |
977 | if (chan == session->metadata) | |
978 | return 0; | |
979 | ||
980 | WARN_ON_ONCE(!chan->header_type); | |
981 | ret = lttng_metadata_printf(session, | |
982 | "stream {\n" | |
983 | " id = %u;\n" | |
984 | " event.header := %s;\n" | |
985 | " packet.context := struct packet_context;\n", | |
986 | chan->id, | |
987 | chan->header_type == 1 ? "struct event_header_compact" : | |
988 | "struct event_header_large"); | |
989 | if (ret) | |
990 | goto end; | |
991 | ||
992 | if (chan->ctx) { | |
993 | ret = lttng_metadata_printf(session, | |
994 | " event.context := struct {\n"); | |
995 | if (ret) | |
996 | goto end; | |
997 | } | |
998 | ret = _ltt_context_metadata_statedump(session, chan->ctx); | |
999 | if (ret) | |
1000 | goto end; | |
1001 | if (chan->ctx) { | |
1002 | ret = lttng_metadata_printf(session, | |
1003 | " };\n"); | |
1004 | if (ret) | |
1005 | goto end; | |
1006 | } | |
1007 | ||
1008 | ret = lttng_metadata_printf(session, | |
1009 | "};\n\n"); | |
1010 | ||
1011 | chan->metadata_dumped = 1; | |
1012 | end: | |
1013 | return ret; | |
1014 | } | |
1015 | ||
1016 | static | |
1017 | int _ltt_stream_packet_context_declare(struct ltt_session *session) | |
1018 | { | |
1019 | return lttng_metadata_printf(session, | |
1020 | "struct packet_context {\n" | |
28b12049 MD |
1021 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1022 | " uint64_clock_monotonic_t timestamp_end;\n" | |
8020ceb5 MD |
1023 | " uint32_t events_discarded;\n" |
1024 | " uint32_t content_size;\n" | |
1025 | " uint32_t packet_size;\n" | |
1026 | " uint32_t cpu_id;\n" | |
1027 | "};\n\n" | |
1028 | ); | |
1029 | } | |
1030 | ||
1031 | /* | |
1032 | * Compact header: | |
1033 | * id: range: 0 - 30. | |
1034 | * id 31 is reserved to indicate an extended header. | |
1035 | * | |
1036 | * Large header: | |
1037 | * id: range: 0 - 65534. | |
1038 | * id 65535 is reserved to indicate an extended header. | |
1039 | */ | |
1040 | static | |
1041 | int _ltt_event_header_declare(struct ltt_session *session) | |
1042 | { | |
1043 | return lttng_metadata_printf(session, | |
1044 | "struct event_header_compact {\n" | |
1045 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1046 | " variant <id> {\n" | |
1047 | " struct {\n" | |
28b12049 | 1048 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1049 | " } compact;\n" |
1050 | " struct {\n" | |
1051 | " uint32_t id;\n" | |
28b12049 | 1052 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1053 | " } extended;\n" |
1054 | " } v;\n" | |
1055 | "} align(%u);\n" | |
1056 | "\n" | |
1057 | "struct event_header_large {\n" | |
1058 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1059 | " variant <id> {\n" | |
1060 | " struct {\n" | |
28b12049 | 1061 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1062 | " } compact;\n" |
1063 | " struct {\n" | |
1064 | " uint32_t id;\n" | |
28b12049 | 1065 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1066 | " } extended;\n" |
1067 | " } v;\n" | |
1068 | "} align(%u);\n\n", | |
1dbfff0c MD |
1069 | lttng_alignof(uint32_t) * CHAR_BIT, |
1070 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1071 | ); |
1072 | } | |
1073 | ||
28b12049 MD |
1074 | /* |
1075 | * Approximation of NTP time of day to clock monotonic correlation, | |
1076 | * taken at start of trace. | |
1077 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1078 | * in future versions. | |
1079 | */ | |
1080 | static | |
1081 | uint64_t measure_clock_offset(void) | |
1082 | { | |
1083 | uint64_t offset, monotonic[2], realtime; | |
1084 | struct timespec rts = { 0, 0 }; | |
1085 | int ret; | |
1086 | ||
1087 | monotonic[0] = trace_clock_read64(); | |
1088 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1089 | if (ret < 0) | |
1090 | return 0; | |
1091 | monotonic[1] = trace_clock_read64(); | |
1092 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
17ec046a | 1093 | realtime = (uint64_t) rts.tv_sec * 1000000000ULL; |
28b12049 MD |
1094 | realtime += rts.tv_nsec; |
1095 | offset = realtime - offset; | |
1096 | return offset; | |
1097 | } | |
1098 | ||
8020ceb5 MD |
1099 | /* |
1100 | * Output metadata into this session's metadata buffers. | |
1101 | */ | |
1102 | static | |
1103 | int _ltt_session_metadata_statedump(struct ltt_session *session) | |
1104 | { | |
b5234c06 | 1105 | unsigned char *uuid_c = session->uuid; |
19d8b1b3 MD |
1106 | char uuid_s[LTTNG_UST_UUID_STR_LEN], |
1107 | clock_uuid_s[LTTNG_UST_UUID_STR_LEN]; | |
8020ceb5 MD |
1108 | struct ltt_channel *chan; |
1109 | struct ltt_event *event; | |
1110 | int ret = 0; | |
08114193 | 1111 | char procname[LTTNG_UST_PROCNAME_LEN] = ""; |
8020ceb5 | 1112 | |
b5234c06 | 1113 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1114 | return 0; |
1115 | if (session->metadata_dumped) | |
1116 | goto skip_session; | |
1117 | if (!session->metadata) { | |
b5234c06 | 1118 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1119 | return -EPERM; |
1120 | } | |
1121 | ||
1122 | snprintf(uuid_s, sizeof(uuid_s), | |
1123 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1124 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1125 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1126 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1127 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1128 | ||
1129 | ret = lttng_metadata_printf(session, | |
1130 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1131 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1132 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1133 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
1134 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" | |
1135 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1136 | "\n" | |
1137 | "trace {\n" | |
1138 | " major = %u;\n" | |
1139 | " minor = %u;\n" | |
1140 | " uuid = \"%s\";\n" | |
1141 | " byte_order = %s;\n" | |
1142 | " packet.header := struct {\n" | |
1143 | " uint32_t magic;\n" | |
1144 | " uint8_t uuid[16];\n" | |
1145 | " uint32_t stream_id;\n" | |
1146 | " };\n" | |
1147 | "};\n\n", | |
1dbfff0c MD |
1148 | lttng_alignof(uint8_t) * CHAR_BIT, |
1149 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1150 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1151 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2694975d MD |
1152 | CTF_SPEC_MAJOR, |
1153 | CTF_SPEC_MINOR, | |
8020ceb5 | 1154 | uuid_s, |
8a98a75d | 1155 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1156 | "be" |
1157 | #else | |
1158 | "le" | |
1159 | #endif | |
1160 | ); | |
1161 | if (ret) | |
1162 | goto end; | |
1163 | ||
b020e504 | 1164 | /* ignore error, just use empty string if error. */ |
08114193 MD |
1165 | lttng_ust_getprocname(procname); |
1166 | procname[LTTNG_UST_PROCNAME_LEN - 1] = '\0'; | |
b020e504 MD |
1167 | ret = lttng_metadata_printf(session, |
1168 | "env {\n" | |
1169 | " vpid = %d;\n" | |
1170 | " procname = \"%s\";\n" | |
2694975d MD |
1171 | " domain = \"ust\";\n" |
1172 | " tracer_name = \"lttng-ust\";\n" | |
1173 | " tracer_major = %u;\n" | |
1174 | " tracer_minor = %u;\n" | |
1175 | " tracer_patchlevel = %u;\n" | |
b020e504 MD |
1176 | "};\n\n", |
1177 | (int) getpid(), | |
1178 | procname, | |
2694975d MD |
1179 | LTTNG_UST_MAJOR_VERSION, |
1180 | LTTNG_UST_MINOR_VERSION, | |
1181 | LTTNG_UST_PATCHLEVEL_VERSION | |
b020e504 MD |
1182 | ); |
1183 | if (ret) | |
1184 | goto end; | |
1185 | ||
28b12049 MD |
1186 | ret = lttng_metadata_printf(session, |
1187 | "clock {\n" | |
939950af MD |
1188 | " name = %s;\n", |
1189 | "monotonic" | |
1190 | ); | |
1191 | if (ret) | |
1192 | goto end; | |
1193 | ||
1194 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1195 | ret = lttng_metadata_printf(session, | |
1196 | " uuid = \"%s\";\n", | |
1197 | clock_uuid_s | |
1198 | ); | |
1199 | if (ret) | |
1200 | goto end; | |
1201 | } | |
1202 | ||
1203 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1204 | " description = \"Monotonic Clock\";\n" |
1205 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1206 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1207 | " offset = %" PRIu64 ";\n" | |
1208 | "};\n\n", | |
28b12049 MD |
1209 | trace_clock_freq(), |
1210 | measure_clock_offset() | |
1211 | ); | |
1212 | if (ret) | |
1213 | goto end; | |
1214 | ||
1215 | ret = lttng_metadata_printf(session, | |
1216 | "typealias integer {\n" | |
1217 | " size = 27; align = 1; signed = false;\n" | |
1218 | " map = clock.monotonic.value;\n" | |
1219 | "} := uint27_clock_monotonic_t;\n" | |
1220 | "\n" | |
1221 | "typealias integer {\n" | |
1222 | " size = 32; align = %u; signed = false;\n" | |
1223 | " map = clock.monotonic.value;\n" | |
1224 | "} := uint32_clock_monotonic_t;\n" | |
1225 | "\n" | |
1226 | "typealias integer {\n" | |
1227 | " size = 64; align = %u; signed = false;\n" | |
1228 | " map = clock.monotonic.value;\n" | |
1229 | "} := uint64_clock_monotonic_t;\n\n", | |
1230 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1231 | lttng_alignof(uint64_t) * CHAR_BIT | |
1232 | ); | |
1233 | if (ret) | |
1234 | goto end; | |
1235 | ||
8020ceb5 MD |
1236 | ret = _ltt_stream_packet_context_declare(session); |
1237 | if (ret) | |
1238 | goto end; | |
1239 | ||
1240 | ret = _ltt_event_header_declare(session); | |
1241 | if (ret) | |
1242 | goto end; | |
1243 | ||
1244 | skip_session: | |
b5234c06 | 1245 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
1246 | ret = _ltt_channel_metadata_statedump(session, chan); |
1247 | if (ret) | |
1248 | goto end; | |
1249 | } | |
1250 | ||
b5234c06 | 1251 | cds_list_for_each_entry(event, &session->events, list) { |
8020ceb5 MD |
1252 | ret = _ltt_event_metadata_statedump(session, event->chan, event); |
1253 | if (ret) | |
1254 | goto end; | |
1255 | } | |
1256 | session->metadata_dumped = 1; | |
1257 | end: | |
1258 | return ret; | |
1259 | } | |
1260 | ||
003fedf4 | 1261 | void lttng_ust_events_exit(void) |
8020ceb5 MD |
1262 | { |
1263 | struct ltt_session *session, *tmpsession; | |
1264 | ||
b5234c06 | 1265 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, list) |
8020ceb5 | 1266 | ltt_session_destroy(session); |
8020ceb5 | 1267 | } |
457a6b58 MD |
1268 | |
1269 | /* WILDCARDS */ | |
1270 | ||
1271 | static | |
1272 | int wildcard_same_loglevel(struct wildcard_entry *e, | |
1273 | enum lttng_ust_loglevel_type loglevel_type, | |
1274 | int loglevel) | |
1275 | { | |
1276 | if (e->loglevel_type == loglevel_type && e->loglevel == loglevel) | |
1277 | return 1; | |
1278 | else | |
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | #if 0 | |
1283 | static | |
1284 | int wildcard_is_within(struct wildcard_entry *e, | |
1285 | enum lttng_ust_loglevel_type loglevel_type, | |
1286 | int loglevel) | |
1287 | { | |
1288 | if (e->loglevel_type == LTTNG_UST_LOGLEVEL_ALL | |
1289 | || e->loglevel == -1) | |
1290 | return 1; | |
1291 | switch (e->loglevel_type) { | |
1292 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1293 | switch (loglevel_type) { | |
1294 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1295 | if (e->loglevel >= loglevel) | |
1296 | return 1; | |
1297 | else | |
1298 | return 0; | |
1299 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1300 | if (e->loglevel <= 0 && loglevel == 0) | |
1301 | return 1; | |
1302 | else | |
1303 | return 0; | |
1304 | } | |
1305 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1306 | switch (loglevel_type) { | |
1307 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1308 | if (loglevel <= 0) | |
1309 | return 1; | |
1310 | else | |
1311 | return 0; | |
1312 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1313 | if (e->loglevel == loglevel) | |
1314 | return 1; | |
1315 | else | |
1316 | return 0; | |
1317 | } | |
1318 | } | |
1319 | } | |
1320 | #endif | |
1321 | ||
1322 | /* | |
1323 | * Add the wildcard to the wildcard list. Must be called with | |
1324 | * ust lock held. | |
1325 | */ | |
1326 | static | |
1327 | struct session_wildcard *add_wildcard(struct ltt_channel *chan, | |
1328 | struct lttng_ust_event *event_param) | |
1329 | { | |
1330 | struct wildcard_entry *e; | |
1331 | struct session_wildcard *sw; | |
1332 | size_t name_len = strlen(event_param->name) + 1; | |
1333 | int found = 0; | |
1334 | ||
1335 | /* | |
1336 | * Try to find global wildcard entry. Given that this is shared | |
1337 | * across all sessions, we need to check for exact loglevel | |
1338 | * match, not just whether contained within the existing ones. | |
1339 | */ | |
1340 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
1341 | if (!strncmp(event_param->name, e->name, | |
1342 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
1343 | if (wildcard_same_loglevel(e, | |
1344 | event_param->loglevel_type, | |
1345 | event_param->loglevel)) { | |
1346 | found = 1; | |
1347 | break; | |
1348 | } | |
1349 | } | |
1350 | } | |
1351 | ||
1352 | if (!found) { | |
1353 | /* | |
1354 | * Create global wildcard entry if not found. Using | |
1355 | * zmalloc here to allocate a variable length element. | |
1356 | * Could cause some memory fragmentation if overused. | |
1357 | */ | |
1358 | e = zmalloc(sizeof(struct wildcard_entry) + name_len); | |
1359 | if (!e) | |
1360 | return ERR_PTR(-ENOMEM); | |
1361 | memcpy(&e->name[0], event_param->name, name_len); | |
aa141955 MD |
1362 | e->loglevel_type = event_param->loglevel_type; |
1363 | e->loglevel = event_param->loglevel; | |
457a6b58 MD |
1364 | cds_list_add(&e->list, &wildcard_list); |
1365 | CDS_INIT_LIST_HEAD(&e->session_list); | |
1366 | } | |
1367 | ||
1368 | /* session wildcard */ | |
1369 | cds_list_for_each_entry(sw, &e->session_list, session_list) { | |
1370 | if (chan == sw->chan) { | |
1371 | DBG("wildcard %s busy for this channel", | |
1372 | event_param->name); | |
1373 | return ERR_PTR(-EEXIST); /* Already there */ | |
1374 | } | |
1375 | } | |
1376 | sw = zmalloc(sizeof(struct session_wildcard)); | |
1377 | if (!sw) | |
1378 | return ERR_PTR(-ENOMEM); | |
1379 | sw->chan = chan; | |
1380 | sw->enabled = 1; | |
1381 | memcpy(&sw->event_param, event_param, sizeof(sw->event_param)); | |
1382 | sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT; | |
1383 | sw->event_param.loglevel_type = event_param->loglevel_type; | |
1384 | sw->event_param.loglevel = event_param->loglevel; | |
1385 | CDS_INIT_LIST_HEAD(&sw->events); | |
1386 | cds_list_add(&sw->list, &chan->session->wildcards); | |
1387 | cds_list_add(&sw->session_list, &e->session_list); | |
1388 | sw->entry = e; | |
1389 | ltt_probes_create_wildcard_events(e, sw); | |
1390 | return sw; | |
1391 | } | |
1392 | ||
1393 | /* | |
1394 | * Remove the wildcard from the wildcard list. Must be called with | |
1395 | * ust_lock held. Only called at session teardown. | |
1396 | */ | |
1397 | static | |
1398 | void _remove_wildcard(struct session_wildcard *wildcard) | |
1399 | { | |
1400 | struct ltt_event *ev, *tmp; | |
1401 | ||
1402 | /* | |
1403 | * Just remove the events owned (for enable/disable) by this | |
1404 | * wildcard from the list. The session teardown will take care | |
1405 | * of freeing the event memory. | |
1406 | */ | |
1407 | cds_list_for_each_entry_safe(ev, tmp, &wildcard->events, | |
1408 | wildcard_list) { | |
1409 | cds_list_del(&ev->wildcard_list); | |
1410 | } | |
1411 | cds_list_del(&wildcard->session_list); | |
1412 | cds_list_del(&wildcard->list); | |
1413 | if (cds_list_empty(&wildcard->entry->session_list)) { | |
1414 | cds_list_del(&wildcard->entry->list); | |
1415 | free(wildcard->entry); | |
1416 | } | |
1417 | free(wildcard); | |
1418 | } | |
1419 | ||
1420 | int ltt_wildcard_create(struct ltt_channel *chan, | |
1421 | struct lttng_ust_event *event_param, | |
1422 | struct session_wildcard **_sw) | |
1423 | { | |
1424 | struct session_wildcard *sw; | |
1425 | ||
1426 | sw = add_wildcard(chan, event_param); | |
1427 | if (!sw || IS_ERR(sw)) { | |
1428 | return PTR_ERR(sw); | |
1429 | } | |
1430 | *_sw = sw; | |
1431 | return 0; | |
1432 | } | |
1433 | ||
1434 | static | |
1435 | void _ltt_wildcard_destroy(struct session_wildcard *sw) | |
1436 | { | |
1437 | _remove_wildcard(sw); | |
1438 | } | |
1439 | ||
1440 | int ltt_wildcard_enable(struct session_wildcard *wildcard) | |
1441 | { | |
1442 | struct ltt_event *ev; | |
1443 | int ret; | |
1444 | ||
1445 | if (wildcard->enabled) | |
1446 | return -EEXIST; | |
1447 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1448 | ret = ltt_event_enable(ev); | |
1449 | if (ret) { | |
1450 | DBG("Error: enable error.\n"); | |
1451 | return ret; | |
1452 | } | |
1453 | } | |
1454 | wildcard->enabled = 1; | |
1455 | return 0; | |
1456 | } | |
1457 | ||
1458 | int ltt_wildcard_disable(struct session_wildcard *wildcard) | |
1459 | { | |
1460 | struct ltt_event *ev; | |
1461 | int ret; | |
1462 | ||
1463 | if (!wildcard->enabled) | |
1464 | return -EEXIST; | |
1465 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1466 | ret = ltt_event_disable(ev); | |
1467 | if (ret) { | |
1468 | DBG("Error: disable error.\n"); | |
1469 | return ret; | |
1470 | } | |
1471 | } | |
1472 | wildcard->enabled = 0; | |
1473 | return 0; | |
1474 | } | |
eddd8d5d MD |
1475 | |
1476 | /* | |
1477 | * Take the TLS "fault" in libuuid if dlopen'd, which can take the | |
1478 | * dynamic linker mutex, outside of the UST lock, since the UST lock is | |
1479 | * taken in constructors, which are called with dynamic linker mutex | |
1480 | * held. | |
1481 | */ | |
1482 | void lttng_fixup_event_tls(void) | |
1483 | { | |
60c089cf | 1484 | unsigned char uuid[LTTNG_UST_UUID_STR_LEN]; |
eddd8d5d | 1485 | |
60c089cf | 1486 | (void) lttng_ust_uuid_generate(uuid); |
eddd8d5d | 1487 | } |