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, | |
2d78951a | 254 | &event_param, &ev); |
e6c12e3d MD |
255 | if (ret) { |
256 | DBG("Error creating event"); | |
257 | continue; | |
258 | } | |
259 | cds_list_add(&ev->wildcard_list, | |
260 | &sw->events); | |
2d78951a MD |
261 | lttng_filter_event_link_bytecode(ev, |
262 | sw->filter_bytecode); | |
e6c12e3d MD |
263 | } |
264 | } | |
265 | } | |
266 | ||
48bf7c27 MD |
267 | if (name_len > LTTNG_UST_SYM_NAME_LEN) { |
268 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN); | |
269 | name_len = LTTNG_UST_SYM_NAME_LEN; | |
ff412fb5 | 270 | } |
48bf7c27 | 271 | hash = jhash(name, name_len - 1, 0); |
8165c8da MD |
272 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
273 | cds_hlist_for_each_entry_safe(e, node, p, head, node) { | |
274 | struct ltt_event *event; | |
275 | struct ltt_channel *chan; | |
276 | ||
fe2d02f4 | 277 | if (!ltt_loglevel_match(desc, |
457a6b58 MD |
278 | e->loglevel_type, |
279 | e->loglevel)) { | |
280 | continue; | |
281 | } | |
282 | if (strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) { | |
283 | continue; | |
284 | } | |
fe2d02f4 | 285 | event = e->event; |
8165c8da MD |
286 | chan = event->chan; |
287 | assert(!event->desc); | |
288 | event->desc = desc; | |
289 | event->pending_probe = NULL; | |
290 | remove_pending_probe(e); | |
291 | ret |= __tracepoint_probe_register(name, | |
292 | event->desc->probe_callback, | |
67e5f391 | 293 | event, event->desc->signature); |
636c5aa4 MD |
294 | if (ret) |
295 | continue; | |
296 | event->id = chan->free_event_id++; | |
8165c8da MD |
297 | ret |= _ltt_event_metadata_statedump(chan->session, chan, |
298 | event); | |
cd54f6d9 MD |
299 | lttng_filter_event_link_bytecode(event, |
300 | event->filter_bytecode); | |
8165c8da MD |
301 | } |
302 | return ret; | |
303 | } | |
304 | ||
8020ceb5 MD |
305 | void synchronize_trace(void) |
306 | { | |
8020ceb5 | 307 | synchronize_rcu(); |
8020ceb5 MD |
308 | } |
309 | ||
310 | struct ltt_session *ltt_session_create(void) | |
311 | { | |
312 | struct ltt_session *session; | |
19d8b1b3 | 313 | int ret; |
8020ceb5 | 314 | |
b5234c06 | 315 | session = zmalloc(sizeof(struct ltt_session)); |
8020ceb5 MD |
316 | if (!session) |
317 | return NULL; | |
b5234c06 MD |
318 | CDS_INIT_LIST_HEAD(&session->chan); |
319 | CDS_INIT_LIST_HEAD(&session->events); | |
e6c12e3d | 320 | CDS_INIT_LIST_HEAD(&session->wildcards); |
19d8b1b3 MD |
321 | ret = lttng_ust_uuid_generate(session->uuid); |
322 | if (ret != 0) { | |
323 | session->uuid[0] = '\0'; | |
324 | } | |
b5234c06 | 325 | cds_list_add(&session->list, &sessions); |
8020ceb5 MD |
326 | return session; |
327 | } | |
328 | ||
329 | void ltt_session_destroy(struct ltt_session *session) | |
330 | { | |
331 | struct ltt_channel *chan, *tmpchan; | |
332 | struct ltt_event *event, *tmpevent; | |
e6c12e3d | 333 | struct session_wildcard *wildcard, *tmpwildcard; |
8020ceb5 MD |
334 | int ret; |
335 | ||
b5234c06 MD |
336 | CMM_ACCESS_ONCE(session->active) = 0; |
337 | cds_list_for_each_entry(event, &session->events, list) { | |
8020ceb5 MD |
338 | ret = _ltt_event_unregister(event); |
339 | WARN_ON(ret); | |
340 | } | |
341 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e6c12e3d MD |
342 | cds_list_for_each_entry_safe(wildcard, tmpwildcard, &session->wildcards, list) |
343 | _ltt_wildcard_destroy(wildcard); | |
b5234c06 | 344 | cds_list_for_each_entry_safe(event, tmpevent, &session->events, list) |
8020ceb5 | 345 | _ltt_event_destroy(event); |
b5234c06 | 346 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list) |
8020ceb5 | 347 | _ltt_channel_destroy(chan); |
b5234c06 | 348 | cds_list_del(&session->list); |
b5234c06 | 349 | free(session); |
8020ceb5 MD |
350 | } |
351 | ||
976fe9ea | 352 | int ltt_session_enable(struct ltt_session *session) |
8020ceb5 MD |
353 | { |
354 | int ret = 0; | |
355 | struct ltt_channel *chan; | |
356 | ||
8020ceb5 MD |
357 | if (session->active) { |
358 | ret = -EBUSY; | |
359 | goto end; | |
360 | } | |
361 | ||
362 | /* | |
363 | * Snapshot the number of events per channel to know the type of header | |
364 | * we need to use. | |
365 | */ | |
b5234c06 | 366 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
367 | if (chan->header_type) |
368 | continue; /* don't change it if session stop/restart */ | |
369 | if (chan->free_event_id < 31) | |
370 | chan->header_type = 1; /* compact */ | |
371 | else | |
372 | chan->header_type = 2; /* large */ | |
373 | } | |
374 | ||
b5234c06 MD |
375 | CMM_ACCESS_ONCE(session->active) = 1; |
376 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
8020ceb5 | 377 | ret = _ltt_session_metadata_statedump(session); |
4b4de73e | 378 | if (ret) |
b5234c06 | 379 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 380 | end: |
8020ceb5 MD |
381 | return ret; |
382 | } | |
383 | ||
976fe9ea | 384 | int ltt_session_disable(struct ltt_session *session) |
8020ceb5 MD |
385 | { |
386 | int ret = 0; | |
387 | ||
8020ceb5 MD |
388 | if (!session->active) { |
389 | ret = -EBUSY; | |
390 | goto end; | |
391 | } | |
b5234c06 | 392 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 393 | end: |
8020ceb5 MD |
394 | return ret; |
395 | } | |
396 | ||
976fe9ea MD |
397 | int ltt_channel_enable(struct ltt_channel *channel) |
398 | { | |
399 | int old; | |
400 | ||
9beb36ba MD |
401 | if (channel == channel->session->metadata) |
402 | return -EPERM; | |
b5234c06 | 403 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
404 | if (old) |
405 | return -EEXIST; | |
406 | return 0; | |
407 | } | |
408 | ||
409 | int ltt_channel_disable(struct ltt_channel *channel) | |
410 | { | |
411 | int old; | |
412 | ||
9beb36ba MD |
413 | if (channel == channel->session->metadata) |
414 | return -EPERM; | |
b5234c06 | 415 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
416 | if (!old) |
417 | return -EEXIST; | |
418 | return 0; | |
419 | } | |
420 | ||
421 | int ltt_event_enable(struct ltt_event *event) | |
422 | { | |
423 | int old; | |
424 | ||
9beb36ba MD |
425 | if (event->chan == event->chan->session->metadata) |
426 | return -EPERM; | |
b5234c06 | 427 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
428 | if (old) |
429 | return -EEXIST; | |
430 | return 0; | |
431 | } | |
432 | ||
433 | int ltt_event_disable(struct ltt_event *event) | |
434 | { | |
435 | int old; | |
436 | ||
9beb36ba MD |
437 | if (event->chan == event->chan->session->metadata) |
438 | return -EPERM; | |
b5234c06 | 439 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
440 | if (!old) |
441 | return -EEXIST; | |
442 | return 0; | |
443 | } | |
444 | ||
8020ceb5 MD |
445 | struct ltt_channel *ltt_channel_create(struct ltt_session *session, |
446 | const char *transport_name, | |
447 | void *buf_addr, | |
448 | size_t subbuf_size, size_t num_subbuf, | |
449 | unsigned int switch_timer_interval, | |
193183fb | 450 | unsigned int read_timer_interval, |
ef9ff354 MD |
451 | int **shm_fd, int **wait_fd, |
452 | uint64_t **memory_map_size, | |
d028eddb | 453 | struct ltt_channel *chan_priv_init) |
8020ceb5 | 454 | { |
a3f61e7f | 455 | struct ltt_channel *chan = NULL; |
8020ceb5 MD |
456 | struct ltt_transport *transport; |
457 | ||
8020ceb5 MD |
458 | if (session->been_active) |
459 | goto active; /* Refuse to add channel to active session */ | |
460 | transport = ltt_transport_find(transport_name); | |
461 | if (!transport) { | |
b5234c06 | 462 | DBG("LTTng transport %s not found\n", |
8020ceb5 MD |
463 | transport_name); |
464 | goto notransport; | |
465 | } | |
d028eddb MD |
466 | chan_priv_init->id = session->free_chan_id++; |
467 | chan_priv_init->session = session; | |
8020ceb5 MD |
468 | /* |
469 | * Note: the channel creation op already writes into the packet | |
470 | * headers. Therefore the "chan" information used as input | |
471 | * should be already accessible. | |
472 | */ | |
e7372d13 | 473 | chan = transport->ops.channel_create(transport_name, buf_addr, |
8020ceb5 | 474 | subbuf_size, num_subbuf, switch_timer_interval, |
193183fb | 475 | read_timer_interval, shm_fd, wait_fd, |
d028eddb | 476 | memory_map_size, chan_priv_init); |
a3f61e7f | 477 | if (!chan) |
8020ceb5 | 478 | goto create_error; |
976fe9ea | 479 | chan->enabled = 1; |
8020ceb5 | 480 | chan->ops = &transport->ops; |
b5234c06 | 481 | cds_list_add(&chan->list, &session->chan); |
8020ceb5 MD |
482 | return chan; |
483 | ||
484 | create_error: | |
8020ceb5 MD |
485 | notransport: |
486 | active: | |
8020ceb5 MD |
487 | return NULL; |
488 | } | |
489 | ||
490 | /* | |
491 | * Only used internally at session destruction. | |
492 | */ | |
493 | static | |
494 | void _ltt_channel_destroy(struct ltt_channel *chan) | |
495 | { | |
b5234c06 | 496 | cds_list_del(&chan->list); |
8020ceb5 | 497 | lttng_destroy_context(chan->ctx); |
a3f61e7f | 498 | chan->ops->channel_destroy(chan); |
8020ceb5 MD |
499 | } |
500 | ||
501 | /* | |
502 | * Supports event creation while tracing session is active. | |
503 | */ | |
576599a0 MD |
504 | int ltt_event_create(struct ltt_channel *chan, |
505 | struct lttng_ust_event *event_param, | |
576599a0 | 506 | struct ltt_event **_event) |
8020ceb5 | 507 | { |
457a6b58 | 508 | const struct lttng_event_desc *desc = NULL; /* silence gcc */ |
8020ceb5 | 509 | struct ltt_event *event; |
576599a0 | 510 | int ret = 0; |
8020ceb5 | 511 | |
38eb0baa | 512 | if (chan->used_event_id == -1U) { |
576599a0 | 513 | ret = -ENOMEM; |
8020ceb5 | 514 | goto full; |
576599a0 | 515 | } |
8020ceb5 MD |
516 | /* |
517 | * This is O(n^2) (for each event, the loop is called at event | |
518 | * creation). Might require a hash if we have lots of events. | |
519 | */ | |
576599a0 | 520 | cds_list_for_each_entry(event, &chan->session->events, list) { |
ff412fb5 MD |
521 | if (event->desc && !strncmp(event->desc->name, |
522 | event_param->name, | |
523 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
576599a0 | 524 | ret = -EEXIST; |
8020ceb5 | 525 | goto exist; |
576599a0 MD |
526 | } |
527 | } | |
457a6b58 MD |
528 | |
529 | /* | |
530 | * Check if loglevel match. Refuse to connect event if not. | |
531 | */ | |
532 | if (event_param->instrumentation == LTTNG_UST_TRACEPOINT) { | |
533 | desc = ltt_event_get(event_param->name); | |
fe2d02f4 MD |
534 | if (desc) { |
535 | if (!ltt_loglevel_match(desc, | |
536 | event_param->loglevel_type, | |
537 | event_param->loglevel)) { | |
538 | ret = -EPERM; | |
539 | goto no_loglevel_match; | |
540 | } | |
457a6b58 | 541 | } |
fe2d02f4 MD |
542 | /* |
543 | * If descriptor is not there, it will be added to | |
544 | * pending probes. | |
545 | */ | |
457a6b58 | 546 | } |
b5234c06 | 547 | event = zmalloc(sizeof(struct ltt_event)); |
576599a0 MD |
548 | if (!event) { |
549 | ret = -ENOMEM; | |
8020ceb5 | 550 | goto cache_error; |
576599a0 | 551 | } |
8020ceb5 | 552 | event->chan = chan; |
8165c8da MD |
553 | /* |
554 | * used_event_id counts the maximum number of event IDs that can | |
555 | * register if all probes register. | |
556 | */ | |
557 | chan->used_event_id++; | |
976fe9ea | 558 | event->enabled = 1; |
8020ceb5 MD |
559 | event->instrumentation = event_param->instrumentation; |
560 | /* Populate ltt_event structure before tracepoint registration. */ | |
b5234c06 | 561 | cmm_smp_wmb(); |
8020ceb5 | 562 | switch (event_param->instrumentation) { |
b5234c06 | 563 | case LTTNG_UST_TRACEPOINT: |
457a6b58 | 564 | event->desc = desc; |
8165c8da MD |
565 | if (event->desc) { |
566 | ret = __tracepoint_probe_register(event_param->name, | |
567 | event->desc->probe_callback, | |
67e5f391 | 568 | event, event->desc->signature); |
8165c8da MD |
569 | if (ret) |
570 | goto register_error; | |
571 | event->id = chan->free_event_id++; | |
572 | } else { | |
573 | /* | |
574 | * If the probe is not present, event->desc stays NULL, | |
575 | * waiting for the probe to register, and the event->id | |
576 | * stays unallocated. | |
577 | */ | |
457a6b58 MD |
578 | ret = add_pending_probe(event, event_param->name, |
579 | event_param->loglevel_type, | |
580 | event_param->loglevel); | |
8165c8da MD |
581 | if (ret) |
582 | goto add_pending_error; | |
583 | } | |
8020ceb5 | 584 | break; |
8020ceb5 MD |
585 | default: |
586 | WARN_ON_ONCE(1); | |
587 | } | |
8165c8da MD |
588 | if (event->desc) { |
589 | ret = _ltt_event_metadata_statedump(chan->session, chan, event); | |
590 | if (ret) | |
591 | goto statedump_error; | |
592 | } | |
b5234c06 | 593 | cds_list_add(&event->list, &chan->session->events); |
576599a0 MD |
594 | *_event = event; |
595 | return 0; | |
8020ceb5 MD |
596 | |
597 | statedump_error: | |
8165c8da MD |
598 | if (event->desc) { |
599 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_param->name, | |
600 | event->desc->probe_callback, | |
601 | event)); | |
602 | ltt_event_put(event->desc); | |
603 | } | |
604 | add_pending_error: | |
8020ceb5 | 605 | register_error: |
b5234c06 | 606 | free(event); |
8020ceb5 | 607 | cache_error: |
457a6b58 | 608 | no_loglevel_match: |
8020ceb5 MD |
609 | exist: |
610 | full: | |
576599a0 | 611 | return ret; |
8020ceb5 MD |
612 | } |
613 | ||
614 | /* | |
615 | * Only used internally at session destruction. | |
616 | */ | |
617 | int _ltt_event_unregister(struct ltt_event *event) | |
618 | { | |
619 | int ret = -EINVAL; | |
620 | ||
621 | switch (event->instrumentation) { | |
b5234c06 | 622 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
623 | if (event->desc) { |
624 | ret = __tracepoint_probe_unregister(event->desc->name, | |
625 | event->desc->probe_callback, | |
626 | event); | |
627 | if (ret) | |
628 | return ret; | |
629 | } else { | |
630 | remove_pending_probe(event->pending_probe); | |
631 | ret = 0; | |
632 | } | |
8020ceb5 | 633 | break; |
8020ceb5 MD |
634 | default: |
635 | WARN_ON_ONCE(1); | |
636 | } | |
637 | return ret; | |
638 | } | |
639 | ||
640 | /* | |
641 | * Only used internally at session destruction. | |
642 | */ | |
643 | static | |
644 | void _ltt_event_destroy(struct ltt_event *event) | |
645 | { | |
646 | switch (event->instrumentation) { | |
b5234c06 | 647 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
648 | if (event->desc) { |
649 | ltt_event_put(event->desc); | |
650 | } | |
8020ceb5 | 651 | break; |
8020ceb5 MD |
652 | default: |
653 | WARN_ON_ONCE(1); | |
654 | } | |
b5234c06 | 655 | cds_list_del(&event->list); |
8020ceb5 | 656 | lttng_destroy_context(event->ctx); |
2d78951a MD |
657 | free(event->filter_bytecode); |
658 | free(event->filter_data); | |
b5234c06 | 659 | free(event); |
8020ceb5 MD |
660 | } |
661 | ||
662 | /* | |
663 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 664 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
665 | * remaining space left in packet and write, since mutual exclusion |
666 | * protects us from concurrent writes. | |
667 | */ | |
668 | int lttng_metadata_printf(struct ltt_session *session, | |
669 | const char *fmt, ...) | |
670 | { | |
4cfec15c | 671 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
8020ceb5 | 672 | struct ltt_channel *chan = session->metadata; |
b5234c06 | 673 | char *str = NULL; |
8020ceb5 MD |
674 | int ret = 0, waitret; |
675 | size_t len, reserve_len, pos; | |
676 | va_list ap; | |
677 | ||
b5234c06 | 678 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
679 | |
680 | va_start(ap, fmt); | |
b5234c06 | 681 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 682 | va_end(ap); |
b5234c06 | 683 | if (ret < 0) |
8020ceb5 MD |
684 | return -ENOMEM; |
685 | ||
686 | len = strlen(str); | |
687 | pos = 0; | |
688 | ||
689 | for (pos = 0; pos < len; pos += reserve_len) { | |
690 | reserve_len = min_t(size_t, | |
1d498196 | 691 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
692 | len - pos); |
693 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 694 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
695 | /* |
696 | * We don't care about metadata buffer's records lost | |
697 | * count, because we always retry here. Report error if | |
698 | * we need to bail out after timeout or being | |
699 | * interrupted. | |
700 | */ | |
b5234c06 | 701 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
702 | ({ |
703 | ret = chan->ops->event_reserve(&ctx, 0); | |
704 | ret != -ENOBUFS || !ret; | |
705 | }), | |
b5234c06 | 706 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 707 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
708 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
709 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 710 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 711 | if (waitret == -EINTR) |
8020ceb5 MD |
712 | ret = waitret; |
713 | goto end; | |
714 | } | |
715 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
716 | chan->ops->event_commit(&ctx); | |
717 | } | |
718 | end: | |
b5234c06 | 719 | free(str); |
8020ceb5 MD |
720 | return ret; |
721 | } | |
722 | ||
723 | static | |
724 | int _ltt_field_statedump(struct ltt_session *session, | |
725 | const struct lttng_event_field *field) | |
726 | { | |
727 | int ret = 0; | |
728 | ||
729 | switch (field->type.atype) { | |
730 | case atype_integer: | |
731 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 732 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
733 | field->type.u.basic.integer.size, |
734 | field->type.u.basic.integer.alignment, | |
735 | field->type.u.basic.integer.signedness, | |
736 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
737 | ? "none" | |
738 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
739 | ? "UTF8" | |
740 | : "ASCII", | |
741 | field->type.u.basic.integer.base, | |
8a98a75d | 742 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
743 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
744 | #else | |
745 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
746 | #endif | |
747 | field->name); | |
748 | break; | |
749 | case atype_float: | |
750 | ret = lttng_metadata_printf(session, | |
8a98a75d | 751 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
752 | field->type.u.basic._float.exp_dig, |
753 | field->type.u.basic._float.mant_dig, | |
754 | field->type.u.basic._float.alignment, | |
8a98a75d | 755 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
756 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
757 | #else | |
758 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
759 | #endif | |
760 | field->name); | |
761 | break; | |
762 | case atype_enum: | |
763 | ret = lttng_metadata_printf(session, | |
764 | " %s %s;\n", | |
765 | field->type.u.basic.enumeration.name, | |
766 | field->name); | |
767 | break; | |
768 | case atype_array: | |
769 | { | |
770 | const struct lttng_basic_type *elem_type; | |
771 | ||
772 | elem_type = &field->type.u.array.elem_type; | |
773 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 774 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
775 | elem_type->u.basic.integer.size, |
776 | elem_type->u.basic.integer.alignment, | |
777 | elem_type->u.basic.integer.signedness, | |
778 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
779 | ? "none" | |
780 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
781 | ? "UTF8" | |
782 | : "ASCII", | |
783 | elem_type->u.basic.integer.base, | |
8a98a75d | 784 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
785 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
786 | #else | |
787 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
788 | #endif | |
789 | field->name, field->type.u.array.length); | |
790 | break; | |
791 | } | |
792 | case atype_sequence: | |
793 | { | |
794 | const struct lttng_basic_type *elem_type; | |
795 | const struct lttng_basic_type *length_type; | |
796 | ||
797 | elem_type = &field->type.u.sequence.elem_type; | |
798 | length_type = &field->type.u.sequence.length_type; | |
799 | ret = lttng_metadata_printf(session, | |
800 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
801 | length_type->u.basic.integer.size, | |
802 | (unsigned int) length_type->u.basic.integer.alignment, | |
803 | length_type->u.basic.integer.signedness, | |
804 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
805 | ? "none" | |
806 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
807 | ? "UTF8" | |
808 | : "ASCII"), | |
809 | length_type->u.basic.integer.base, | |
8a98a75d | 810 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
811 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
812 | #else | |
813 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
814 | #endif | |
815 | field->name); | |
816 | if (ret) | |
817 | return ret; | |
818 | ||
819 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 820 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
821 | elem_type->u.basic.integer.size, |
822 | (unsigned int) elem_type->u.basic.integer.alignment, | |
823 | elem_type->u.basic.integer.signedness, | |
824 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
825 | ? "none" | |
826 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
827 | ? "UTF8" | |
828 | : "ASCII"), | |
829 | elem_type->u.basic.integer.base, | |
8a98a75d | 830 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
831 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
832 | #else | |
833 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
834 | #endif | |
835 | field->name, | |
836 | field->name); | |
837 | break; | |
838 | } | |
839 | ||
840 | case atype_string: | |
841 | /* Default encoding is UTF8 */ | |
842 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 843 | " string%s _%s;\n", |
8020ceb5 MD |
844 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
845 | " { encoding = ASCII; }" : "", | |
846 | field->name); | |
847 | break; | |
848 | default: | |
849 | WARN_ON_ONCE(1); | |
850 | return -EINVAL; | |
851 | } | |
852 | return ret; | |
853 | } | |
854 | ||
855 | static | |
856 | int _ltt_context_metadata_statedump(struct ltt_session *session, | |
857 | struct lttng_ctx *ctx) | |
858 | { | |
859 | int ret = 0; | |
860 | int i; | |
861 | ||
862 | if (!ctx) | |
863 | return 0; | |
864 | for (i = 0; i < ctx->nr_fields; i++) { | |
865 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
866 | ||
867 | ret = _ltt_field_statedump(session, &field->event_field); | |
868 | if (ret) | |
869 | return ret; | |
870 | } | |
871 | return ret; | |
872 | } | |
873 | ||
874 | static | |
875 | int _ltt_fields_metadata_statedump(struct ltt_session *session, | |
876 | struct ltt_event *event) | |
877 | { | |
878 | const struct lttng_event_desc *desc = event->desc; | |
879 | int ret = 0; | |
880 | int i; | |
881 | ||
882 | for (i = 0; i < desc->nr_fields; i++) { | |
883 | const struct lttng_event_field *field = &desc->fields[i]; | |
884 | ||
885 | ret = _ltt_field_statedump(session, field); | |
886 | if (ret) | |
887 | return ret; | |
888 | } | |
889 | return ret; | |
890 | } | |
891 | ||
892 | static | |
893 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
894 | struct ltt_channel *chan, | |
895 | struct ltt_event *event) | |
896 | { | |
897 | int ret = 0; | |
8155c5e8 | 898 | int loglevel = TRACE_DEFAULT; |
8020ceb5 | 899 | |
b5234c06 | 900 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
901 | return 0; |
902 | if (chan == session->metadata) | |
903 | return 0; | |
8165c8da MD |
904 | /* |
905 | * Don't print events for which probe load is pending. | |
906 | */ | |
907 | if (!event->desc) | |
908 | return 0; | |
8020ceb5 MD |
909 | |
910 | ret = lttng_metadata_printf(session, | |
911 | "event {\n" | |
7083f0fe | 912 | " name = \"%s\";\n" |
8020ceb5 MD |
913 | " id = %u;\n" |
914 | " stream_id = %u;\n", | |
915 | event->desc->name, | |
916 | event->id, | |
917 | event->chan->id); | |
918 | if (ret) | |
919 | goto end; | |
920 | ||
8155c5e8 MD |
921 | if (event->desc->loglevel) |
922 | loglevel = *(*event->desc->loglevel); | |
923 | ||
924 | ret = lttng_metadata_printf(session, | |
925 | " loglevel = %d;\n", | |
926 | loglevel); | |
927 | if (ret) | |
928 | goto end; | |
e6c12e3d | 929 | |
8020ceb5 MD |
930 | if (event->ctx) { |
931 | ret = lttng_metadata_printf(session, | |
932 | " context := struct {\n"); | |
933 | if (ret) | |
934 | goto end; | |
935 | } | |
936 | ret = _ltt_context_metadata_statedump(session, event->ctx); | |
937 | if (ret) | |
938 | goto end; | |
939 | if (event->ctx) { | |
940 | ret = lttng_metadata_printf(session, | |
941 | " };\n"); | |
942 | if (ret) | |
943 | goto end; | |
944 | } | |
945 | ||
946 | ret = lttng_metadata_printf(session, | |
947 | " fields := struct {\n" | |
948 | ); | |
949 | if (ret) | |
950 | goto end; | |
951 | ||
952 | ret = _ltt_fields_metadata_statedump(session, event); | |
953 | if (ret) | |
954 | goto end; | |
955 | ||
956 | /* | |
957 | * LTTng space reservation can only reserve multiples of the | |
958 | * byte size. | |
959 | */ | |
960 | ret = lttng_metadata_printf(session, | |
961 | " };\n" | |
962 | "};\n\n"); | |
963 | if (ret) | |
964 | goto end; | |
965 | ||
966 | event->metadata_dumped = 1; | |
967 | end: | |
968 | return ret; | |
969 | ||
970 | } | |
971 | ||
972 | static | |
973 | int _ltt_channel_metadata_statedump(struct ltt_session *session, | |
974 | struct ltt_channel *chan) | |
975 | { | |
976 | int ret = 0; | |
977 | ||
b5234c06 | 978 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
979 | return 0; |
980 | if (chan == session->metadata) | |
981 | return 0; | |
982 | ||
983 | WARN_ON_ONCE(!chan->header_type); | |
984 | ret = lttng_metadata_printf(session, | |
985 | "stream {\n" | |
986 | " id = %u;\n" | |
987 | " event.header := %s;\n" | |
988 | " packet.context := struct packet_context;\n", | |
989 | chan->id, | |
990 | chan->header_type == 1 ? "struct event_header_compact" : | |
991 | "struct event_header_large"); | |
992 | if (ret) | |
993 | goto end; | |
994 | ||
995 | if (chan->ctx) { | |
996 | ret = lttng_metadata_printf(session, | |
997 | " event.context := struct {\n"); | |
998 | if (ret) | |
999 | goto end; | |
1000 | } | |
1001 | ret = _ltt_context_metadata_statedump(session, chan->ctx); | |
1002 | if (ret) | |
1003 | goto end; | |
1004 | if (chan->ctx) { | |
1005 | ret = lttng_metadata_printf(session, | |
1006 | " };\n"); | |
1007 | if (ret) | |
1008 | goto end; | |
1009 | } | |
1010 | ||
1011 | ret = lttng_metadata_printf(session, | |
1012 | "};\n\n"); | |
1013 | ||
1014 | chan->metadata_dumped = 1; | |
1015 | end: | |
1016 | return ret; | |
1017 | } | |
1018 | ||
1019 | static | |
1020 | int _ltt_stream_packet_context_declare(struct ltt_session *session) | |
1021 | { | |
1022 | return lttng_metadata_printf(session, | |
1023 | "struct packet_context {\n" | |
28b12049 MD |
1024 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1025 | " uint64_clock_monotonic_t timestamp_end;\n" | |
18fc8d71 | 1026 | " unsigned long events_discarded;\n" |
8020ceb5 MD |
1027 | " uint32_t content_size;\n" |
1028 | " uint32_t packet_size;\n" | |
1029 | " uint32_t cpu_id;\n" | |
1030 | "};\n\n" | |
1031 | ); | |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * Compact header: | |
1036 | * id: range: 0 - 30. | |
1037 | * id 31 is reserved to indicate an extended header. | |
1038 | * | |
1039 | * Large header: | |
1040 | * id: range: 0 - 65534. | |
1041 | * id 65535 is reserved to indicate an extended header. | |
1042 | */ | |
1043 | static | |
1044 | int _ltt_event_header_declare(struct ltt_session *session) | |
1045 | { | |
1046 | return lttng_metadata_printf(session, | |
1047 | "struct event_header_compact {\n" | |
1048 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1049 | " variant <id> {\n" | |
1050 | " struct {\n" | |
28b12049 | 1051 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1052 | " } compact;\n" |
1053 | " struct {\n" | |
1054 | " uint32_t id;\n" | |
28b12049 | 1055 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1056 | " } extended;\n" |
1057 | " } v;\n" | |
1058 | "} align(%u);\n" | |
1059 | "\n" | |
1060 | "struct event_header_large {\n" | |
1061 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1062 | " variant <id> {\n" | |
1063 | " struct {\n" | |
28b12049 | 1064 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1065 | " } compact;\n" |
1066 | " struct {\n" | |
1067 | " uint32_t id;\n" | |
28b12049 | 1068 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1069 | " } extended;\n" |
1070 | " } v;\n" | |
1071 | "} align(%u);\n\n", | |
1dbfff0c MD |
1072 | lttng_alignof(uint32_t) * CHAR_BIT, |
1073 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1074 | ); |
1075 | } | |
1076 | ||
28b12049 MD |
1077 | /* |
1078 | * Approximation of NTP time of day to clock monotonic correlation, | |
1079 | * taken at start of trace. | |
1080 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1081 | * in future versions. | |
1082 | */ | |
1083 | static | |
1084 | uint64_t measure_clock_offset(void) | |
1085 | { | |
1086 | uint64_t offset, monotonic[2], realtime; | |
1087 | struct timespec rts = { 0, 0 }; | |
1088 | int ret; | |
1089 | ||
1090 | monotonic[0] = trace_clock_read64(); | |
1091 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1092 | if (ret < 0) | |
1093 | return 0; | |
1094 | monotonic[1] = trace_clock_read64(); | |
1095 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
17ec046a | 1096 | realtime = (uint64_t) rts.tv_sec * 1000000000ULL; |
28b12049 MD |
1097 | realtime += rts.tv_nsec; |
1098 | offset = realtime - offset; | |
1099 | return offset; | |
1100 | } | |
1101 | ||
8020ceb5 MD |
1102 | /* |
1103 | * Output metadata into this session's metadata buffers. | |
1104 | */ | |
1105 | static | |
1106 | int _ltt_session_metadata_statedump(struct ltt_session *session) | |
1107 | { | |
b5234c06 | 1108 | unsigned char *uuid_c = session->uuid; |
19d8b1b3 MD |
1109 | char uuid_s[LTTNG_UST_UUID_STR_LEN], |
1110 | clock_uuid_s[LTTNG_UST_UUID_STR_LEN]; | |
8020ceb5 MD |
1111 | struct ltt_channel *chan; |
1112 | struct ltt_event *event; | |
1113 | int ret = 0; | |
08114193 | 1114 | char procname[LTTNG_UST_PROCNAME_LEN] = ""; |
8020ceb5 | 1115 | |
b5234c06 | 1116 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1117 | return 0; |
1118 | if (session->metadata_dumped) | |
1119 | goto skip_session; | |
1120 | if (!session->metadata) { | |
b5234c06 | 1121 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1122 | return -EPERM; |
1123 | } | |
1124 | ||
1125 | snprintf(uuid_s, sizeof(uuid_s), | |
1126 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1127 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1128 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1129 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1130 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1131 | ||
1132 | ret = lttng_metadata_printf(session, | |
1133 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1134 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1135 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1136 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
18fc8d71 | 1137 | "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" |
8020ceb5 MD |
1138 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" |
1139 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1140 | "\n" | |
1141 | "trace {\n" | |
1142 | " major = %u;\n" | |
1143 | " minor = %u;\n" | |
1144 | " uuid = \"%s\";\n" | |
1145 | " byte_order = %s;\n" | |
1146 | " packet.header := struct {\n" | |
1147 | " uint32_t magic;\n" | |
1148 | " uint8_t uuid[16];\n" | |
1149 | " uint32_t stream_id;\n" | |
1150 | " };\n" | |
1151 | "};\n\n", | |
1dbfff0c MD |
1152 | lttng_alignof(uint8_t) * CHAR_BIT, |
1153 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1154 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1155 | lttng_alignof(uint64_t) * CHAR_BIT, | |
18fc8d71 MD |
1156 | sizeof(unsigned long) * CHAR_BIT, |
1157 | lttng_alignof(unsigned long) * CHAR_BIT, | |
2694975d MD |
1158 | CTF_SPEC_MAJOR, |
1159 | CTF_SPEC_MINOR, | |
8020ceb5 | 1160 | uuid_s, |
8a98a75d | 1161 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1162 | "be" |
1163 | #else | |
1164 | "le" | |
1165 | #endif | |
1166 | ); | |
1167 | if (ret) | |
1168 | goto end; | |
1169 | ||
b020e504 | 1170 | /* ignore error, just use empty string if error. */ |
08114193 MD |
1171 | lttng_ust_getprocname(procname); |
1172 | procname[LTTNG_UST_PROCNAME_LEN - 1] = '\0'; | |
b020e504 MD |
1173 | ret = lttng_metadata_printf(session, |
1174 | "env {\n" | |
1175 | " vpid = %d;\n" | |
1176 | " procname = \"%s\";\n" | |
2694975d MD |
1177 | " domain = \"ust\";\n" |
1178 | " tracer_name = \"lttng-ust\";\n" | |
1179 | " tracer_major = %u;\n" | |
1180 | " tracer_minor = %u;\n" | |
1181 | " tracer_patchlevel = %u;\n" | |
b020e504 MD |
1182 | "};\n\n", |
1183 | (int) getpid(), | |
1184 | procname, | |
2694975d MD |
1185 | LTTNG_UST_MAJOR_VERSION, |
1186 | LTTNG_UST_MINOR_VERSION, | |
1187 | LTTNG_UST_PATCHLEVEL_VERSION | |
b020e504 MD |
1188 | ); |
1189 | if (ret) | |
1190 | goto end; | |
1191 | ||
28b12049 MD |
1192 | ret = lttng_metadata_printf(session, |
1193 | "clock {\n" | |
939950af MD |
1194 | " name = %s;\n", |
1195 | "monotonic" | |
1196 | ); | |
1197 | if (ret) | |
1198 | goto end; | |
1199 | ||
1200 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1201 | ret = lttng_metadata_printf(session, | |
1202 | " uuid = \"%s\";\n", | |
1203 | clock_uuid_s | |
1204 | ); | |
1205 | if (ret) | |
1206 | goto end; | |
1207 | } | |
1208 | ||
1209 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1210 | " description = \"Monotonic Clock\";\n" |
1211 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1212 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1213 | " offset = %" PRIu64 ";\n" | |
1214 | "};\n\n", | |
28b12049 MD |
1215 | trace_clock_freq(), |
1216 | measure_clock_offset() | |
1217 | ); | |
1218 | if (ret) | |
1219 | goto end; | |
1220 | ||
1221 | ret = lttng_metadata_printf(session, | |
1222 | "typealias integer {\n" | |
1223 | " size = 27; align = 1; signed = false;\n" | |
1224 | " map = clock.monotonic.value;\n" | |
1225 | "} := uint27_clock_monotonic_t;\n" | |
1226 | "\n" | |
1227 | "typealias integer {\n" | |
1228 | " size = 32; align = %u; signed = false;\n" | |
1229 | " map = clock.monotonic.value;\n" | |
1230 | "} := uint32_clock_monotonic_t;\n" | |
1231 | "\n" | |
1232 | "typealias integer {\n" | |
1233 | " size = 64; align = %u; signed = false;\n" | |
1234 | " map = clock.monotonic.value;\n" | |
1235 | "} := uint64_clock_monotonic_t;\n\n", | |
1236 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1237 | lttng_alignof(uint64_t) * CHAR_BIT | |
1238 | ); | |
1239 | if (ret) | |
1240 | goto end; | |
1241 | ||
8020ceb5 MD |
1242 | ret = _ltt_stream_packet_context_declare(session); |
1243 | if (ret) | |
1244 | goto end; | |
1245 | ||
1246 | ret = _ltt_event_header_declare(session); | |
1247 | if (ret) | |
1248 | goto end; | |
1249 | ||
1250 | skip_session: | |
b5234c06 | 1251 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
1252 | ret = _ltt_channel_metadata_statedump(session, chan); |
1253 | if (ret) | |
1254 | goto end; | |
1255 | } | |
1256 | ||
b5234c06 | 1257 | cds_list_for_each_entry(event, &session->events, list) { |
8020ceb5 MD |
1258 | ret = _ltt_event_metadata_statedump(session, event->chan, event); |
1259 | if (ret) | |
1260 | goto end; | |
1261 | } | |
1262 | session->metadata_dumped = 1; | |
1263 | end: | |
1264 | return ret; | |
1265 | } | |
1266 | ||
003fedf4 | 1267 | void lttng_ust_events_exit(void) |
8020ceb5 MD |
1268 | { |
1269 | struct ltt_session *session, *tmpsession; | |
1270 | ||
b5234c06 | 1271 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, list) |
8020ceb5 | 1272 | ltt_session_destroy(session); |
8020ceb5 | 1273 | } |
457a6b58 MD |
1274 | |
1275 | /* WILDCARDS */ | |
1276 | ||
1277 | static | |
1278 | int wildcard_same_loglevel(struct wildcard_entry *e, | |
1279 | enum lttng_ust_loglevel_type loglevel_type, | |
1280 | int loglevel) | |
1281 | { | |
1282 | if (e->loglevel_type == loglevel_type && e->loglevel == loglevel) | |
1283 | return 1; | |
1284 | else | |
1285 | return 0; | |
1286 | } | |
1287 | ||
1288 | #if 0 | |
1289 | static | |
1290 | int wildcard_is_within(struct wildcard_entry *e, | |
1291 | enum lttng_ust_loglevel_type loglevel_type, | |
1292 | int loglevel) | |
1293 | { | |
1294 | if (e->loglevel_type == LTTNG_UST_LOGLEVEL_ALL | |
1295 | || e->loglevel == -1) | |
1296 | return 1; | |
1297 | switch (e->loglevel_type) { | |
1298 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1299 | switch (loglevel_type) { | |
1300 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1301 | if (e->loglevel >= loglevel) | |
1302 | return 1; | |
1303 | else | |
1304 | return 0; | |
1305 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1306 | if (e->loglevel <= 0 && loglevel == 0) | |
1307 | return 1; | |
1308 | else | |
1309 | return 0; | |
1310 | } | |
1311 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1312 | switch (loglevel_type) { | |
1313 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1314 | if (loglevel <= 0) | |
1315 | return 1; | |
1316 | else | |
1317 | return 0; | |
1318 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1319 | if (e->loglevel == loglevel) | |
1320 | return 1; | |
1321 | else | |
1322 | return 0; | |
1323 | } | |
1324 | } | |
1325 | } | |
1326 | #endif | |
1327 | ||
1328 | /* | |
1329 | * Add the wildcard to the wildcard list. Must be called with | |
1330 | * ust lock held. | |
1331 | */ | |
1332 | static | |
1333 | struct session_wildcard *add_wildcard(struct ltt_channel *chan, | |
1334 | struct lttng_ust_event *event_param) | |
1335 | { | |
1336 | struct wildcard_entry *e; | |
1337 | struct session_wildcard *sw; | |
1338 | size_t name_len = strlen(event_param->name) + 1; | |
1339 | int found = 0; | |
1340 | ||
1341 | /* | |
1342 | * Try to find global wildcard entry. Given that this is shared | |
1343 | * across all sessions, we need to check for exact loglevel | |
1344 | * match, not just whether contained within the existing ones. | |
1345 | */ | |
1346 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
1347 | if (!strncmp(event_param->name, e->name, | |
1348 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
1349 | if (wildcard_same_loglevel(e, | |
1350 | event_param->loglevel_type, | |
1351 | event_param->loglevel)) { | |
1352 | found = 1; | |
1353 | break; | |
1354 | } | |
1355 | } | |
1356 | } | |
1357 | ||
1358 | if (!found) { | |
1359 | /* | |
1360 | * Create global wildcard entry if not found. Using | |
1361 | * zmalloc here to allocate a variable length element. | |
1362 | * Could cause some memory fragmentation if overused. | |
1363 | */ | |
1364 | e = zmalloc(sizeof(struct wildcard_entry) + name_len); | |
1365 | if (!e) | |
1366 | return ERR_PTR(-ENOMEM); | |
1367 | memcpy(&e->name[0], event_param->name, name_len); | |
aa141955 MD |
1368 | e->loglevel_type = event_param->loglevel_type; |
1369 | e->loglevel = event_param->loglevel; | |
457a6b58 MD |
1370 | cds_list_add(&e->list, &wildcard_list); |
1371 | CDS_INIT_LIST_HEAD(&e->session_list); | |
1372 | } | |
1373 | ||
1374 | /* session wildcard */ | |
1375 | cds_list_for_each_entry(sw, &e->session_list, session_list) { | |
1376 | if (chan == sw->chan) { | |
1377 | DBG("wildcard %s busy for this channel", | |
1378 | event_param->name); | |
1379 | return ERR_PTR(-EEXIST); /* Already there */ | |
1380 | } | |
1381 | } | |
1382 | sw = zmalloc(sizeof(struct session_wildcard)); | |
1383 | if (!sw) | |
1384 | return ERR_PTR(-ENOMEM); | |
1385 | sw->chan = chan; | |
1386 | sw->enabled = 1; | |
1387 | memcpy(&sw->event_param, event_param, sizeof(sw->event_param)); | |
1388 | sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT; | |
1389 | sw->event_param.loglevel_type = event_param->loglevel_type; | |
1390 | sw->event_param.loglevel = event_param->loglevel; | |
1391 | CDS_INIT_LIST_HEAD(&sw->events); | |
1392 | cds_list_add(&sw->list, &chan->session->wildcards); | |
1393 | cds_list_add(&sw->session_list, &e->session_list); | |
1394 | sw->entry = e; | |
1395 | ltt_probes_create_wildcard_events(e, sw); | |
1396 | return sw; | |
1397 | } | |
1398 | ||
1399 | /* | |
1400 | * Remove the wildcard from the wildcard list. Must be called with | |
1401 | * ust_lock held. Only called at session teardown. | |
1402 | */ | |
1403 | static | |
1404 | void _remove_wildcard(struct session_wildcard *wildcard) | |
1405 | { | |
1406 | struct ltt_event *ev, *tmp; | |
1407 | ||
1408 | /* | |
1409 | * Just remove the events owned (for enable/disable) by this | |
1410 | * wildcard from the list. The session teardown will take care | |
1411 | * of freeing the event memory. | |
1412 | */ | |
1413 | cds_list_for_each_entry_safe(ev, tmp, &wildcard->events, | |
1414 | wildcard_list) { | |
1415 | cds_list_del(&ev->wildcard_list); | |
1416 | } | |
1417 | cds_list_del(&wildcard->session_list); | |
1418 | cds_list_del(&wildcard->list); | |
1419 | if (cds_list_empty(&wildcard->entry->session_list)) { | |
1420 | cds_list_del(&wildcard->entry->list); | |
1421 | free(wildcard->entry); | |
1422 | } | |
2d78951a | 1423 | free(wildcard->filter_bytecode); |
457a6b58 MD |
1424 | free(wildcard); |
1425 | } | |
1426 | ||
1427 | int ltt_wildcard_create(struct ltt_channel *chan, | |
1428 | struct lttng_ust_event *event_param, | |
1429 | struct session_wildcard **_sw) | |
1430 | { | |
1431 | struct session_wildcard *sw; | |
1432 | ||
1433 | sw = add_wildcard(chan, event_param); | |
1434 | if (!sw || IS_ERR(sw)) { | |
1435 | return PTR_ERR(sw); | |
1436 | } | |
1437 | *_sw = sw; | |
1438 | return 0; | |
1439 | } | |
1440 | ||
1441 | static | |
1442 | void _ltt_wildcard_destroy(struct session_wildcard *sw) | |
1443 | { | |
1444 | _remove_wildcard(sw); | |
1445 | } | |
1446 | ||
1447 | int ltt_wildcard_enable(struct session_wildcard *wildcard) | |
1448 | { | |
1449 | struct ltt_event *ev; | |
1450 | int ret; | |
1451 | ||
1452 | if (wildcard->enabled) | |
1453 | return -EEXIST; | |
1454 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1455 | ret = ltt_event_enable(ev); | |
1456 | if (ret) { | |
1457 | DBG("Error: enable error.\n"); | |
1458 | return ret; | |
1459 | } | |
1460 | } | |
1461 | wildcard->enabled = 1; | |
1462 | return 0; | |
1463 | } | |
1464 | ||
1465 | int ltt_wildcard_disable(struct session_wildcard *wildcard) | |
1466 | { | |
1467 | struct ltt_event *ev; | |
1468 | int ret; | |
1469 | ||
1470 | if (!wildcard->enabled) | |
1471 | return -EEXIST; | |
1472 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1473 | ret = ltt_event_disable(ev); | |
1474 | if (ret) { | |
1475 | DBG("Error: disable error.\n"); | |
1476 | return ret; | |
1477 | } | |
1478 | } | |
1479 | wildcard->enabled = 0; | |
1480 | return 0; | |
1481 | } | |
eddd8d5d MD |
1482 | |
1483 | /* | |
1484 | * Take the TLS "fault" in libuuid if dlopen'd, which can take the | |
1485 | * dynamic linker mutex, outside of the UST lock, since the UST lock is | |
1486 | * taken in constructors, which are called with dynamic linker mutex | |
1487 | * held. | |
1488 | */ | |
1489 | void lttng_fixup_event_tls(void) | |
1490 | { | |
60c089cf | 1491 | unsigned char uuid[LTTNG_UST_UUID_STR_LEN]; |
eddd8d5d | 1492 | |
60c089cf | 1493 | (void) lttng_ust_uuid_generate(uuid); |
eddd8d5d | 1494 | } |