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> | |
a7859af5 | 25 | #include <endian.h> |
b5234c06 | 26 | #include <urcu/list.h> |
8165c8da | 27 | #include <urcu/hlist.h> |
b5234c06 | 28 | #include <pthread.h> |
578ce73a | 29 | #include <uuid/uuid.h> |
b5234c06 | 30 | #include <errno.h> |
f4681817 MD |
31 | #include <sys/shm.h> |
32 | #include <sys/ipc.h> | |
44c72f10 MD |
33 | #include <stdint.h> |
34 | #include <stddef.h> | |
28b12049 MD |
35 | #include <inttypes.h> |
36 | #include <time.h> | |
4c1ee94e | 37 | #include <sys/prctl.h> |
28b12049 | 38 | #include "clock.h" |
44c72f10 MD |
39 | |
40 | #include <urcu-bp.h> | |
41 | #include <urcu/compiler.h> | |
42 | #include <urcu/uatomic.h> | |
43 | #include <urcu/arch.h> | |
44 | ||
45 | #include <lttng/tracepoint.h> | |
4318ae1b | 46 | #include <lttng/ust-events.h> |
44c72f10 MD |
47 | |
48 | #include <usterr-signal-safe.h> | |
49 | #include <helper.h> | |
1f18504e | 50 | #include "error.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 | 58 | |
4c1ee94e MD |
59 | #define PROCNAME_LEN 17 |
60 | ||
8165c8da MD |
61 | /* |
62 | * The sessions mutex is the centralized mutex across UST tracing | |
17dfb34b MD |
63 | * control and probe registration. All operations within this file are |
64 | * called by the communication thread, under ust_lock protection. | |
8165c8da | 65 | */ |
2b2d6ff7 | 66 | static pthread_mutex_t sessions_mutex = PTHREAD_MUTEX_INITIALIZER; |
8165c8da | 67 | |
17dfb34b | 68 | void ust_lock(void) |
8165c8da MD |
69 | { |
70 | pthread_mutex_lock(&sessions_mutex); | |
71 | } | |
72 | ||
17dfb34b | 73 | void ust_unlock(void) |
8165c8da MD |
74 | { |
75 | pthread_mutex_unlock(&sessions_mutex); | |
76 | } | |
77 | ||
b5234c06 | 78 | static CDS_LIST_HEAD(sessions); |
8165c8da | 79 | |
457a6b58 MD |
80 | /* |
81 | * Wildcard list, containing the active wildcards. | |
82 | * Protected by ust lock. | |
83 | */ | |
84 | static CDS_LIST_HEAD(wildcard_list); | |
85 | ||
8165c8da MD |
86 | /* |
87 | * Pending probes hash table, containing the registered ltt events for | |
88 | * which tracepoint probes are still missing. Protected by the sessions | |
89 | * mutex. | |
90 | */ | |
91 | #define PENDING_PROBE_HASH_BITS 6 | |
92 | #define PENDING_PROBE_HASH_SIZE (1 << PENDING_PROBE_HASH_BITS) | |
93 | static struct cds_hlist_head pending_probe_table[PENDING_PROBE_HASH_SIZE]; | |
94 | ||
95 | struct ust_pending_probe { | |
96 | struct ltt_event *event; | |
97 | struct cds_hlist_node node; | |
457a6b58 MD |
98 | enum lttng_ust_loglevel_type loglevel_type; |
99 | int loglevel; | |
8165c8da MD |
100 | char name[]; |
101 | }; | |
8020ceb5 MD |
102 | |
103 | static void _ltt_event_destroy(struct ltt_event *event); | |
e6c12e3d | 104 | static void _ltt_wildcard_destroy(struct session_wildcard *sw); |
8020ceb5 MD |
105 | static void _ltt_channel_destroy(struct ltt_channel *chan); |
106 | static int _ltt_event_unregister(struct ltt_event *event); | |
107 | static | |
108 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
109 | struct ltt_channel *chan, | |
110 | struct ltt_event *event); | |
111 | static | |
112 | int _ltt_session_metadata_statedump(struct ltt_session *session); | |
113 | ||
457a6b58 MD |
114 | int ltt_loglevel_match(const struct lttng_event_desc *desc, |
115 | enum lttng_ust_loglevel_type req_type, | |
116 | int req_loglevel) | |
117 | { | |
118 | int ev_loglevel; | |
119 | ||
120 | if (req_type == LTTNG_UST_LOGLEVEL_ALL) | |
121 | return 1; | |
122 | if (!desc->loglevel) | |
123 | ev_loglevel = TRACE_DEFAULT; | |
124 | else | |
125 | ev_loglevel = *(*desc->loglevel); | |
126 | switch (req_type) { | |
127 | case LTTNG_UST_LOGLEVEL_RANGE: | |
128 | if (ev_loglevel <= req_loglevel || req_loglevel == -1) | |
129 | return 1; | |
130 | else | |
131 | return 0; | |
132 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
133 | if (ev_loglevel == req_loglevel || req_loglevel == -1) | |
134 | return 1; | |
135 | else | |
136 | return 0; | |
137 | case LTTNG_UST_LOGLEVEL_ALL: | |
138 | default: | |
139 | return 1; | |
140 | } | |
141 | } | |
142 | ||
143 | /* | |
144 | * Return wildcard for a given event name if the event name match the | |
145 | * one of the wildcards. | |
146 | * Must be called with ust lock held. | |
147 | * Returns NULL if not present. | |
148 | */ | |
149 | static | |
150 | struct wildcard_entry *match_wildcard(const struct lttng_event_desc *desc) | |
151 | { | |
152 | struct wildcard_entry *e; | |
153 | ||
154 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
155 | /* If only contain '*' */ | |
156 | if (strlen(e->name) == 1) | |
157 | goto possible_match; | |
158 | /* Compare excluding final '*' */ | |
159 | if (!strncmp(desc->name, e->name, strlen(e->name) - 1)) | |
160 | goto possible_match; | |
161 | continue; /* goto next, no match */ | |
162 | possible_match: | |
163 | if (ltt_loglevel_match(desc, | |
164 | e->loglevel_type, | |
165 | e->loglevel)) { | |
166 | return e; | |
167 | } | |
168 | /* no match, loop to next */ | |
169 | } | |
170 | return NULL; | |
171 | } | |
172 | ||
8165c8da MD |
173 | /* |
174 | * called at event creation if probe is missing. | |
175 | * called with session mutex held. | |
176 | */ | |
177 | static | |
457a6b58 MD |
178 | int add_pending_probe(struct ltt_event *event, const char *name, |
179 | enum lttng_ust_loglevel_type loglevel_type, | |
180 | int loglevel) | |
8165c8da MD |
181 | { |
182 | struct cds_hlist_head *head; | |
8165c8da | 183 | struct ust_pending_probe *e; |
48bf7c27 | 184 | size_t name_len = strlen(name) + 1; |
ff412fb5 | 185 | uint32_t hash; |
8165c8da | 186 | |
48bf7c27 MD |
187 | if (name_len > LTTNG_UST_SYM_NAME_LEN) { |
188 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN); | |
189 | name_len = LTTNG_UST_SYM_NAME_LEN; | |
ff412fb5 | 190 | } |
48bf7c27 | 191 | hash = jhash(name, name_len - 1, 0); |
8165c8da MD |
192 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
193 | e = zmalloc(sizeof(struct ust_pending_probe) + name_len); | |
194 | if (!e) | |
195 | return -ENOMEM; | |
48bf7c27 MD |
196 | memcpy(&e->name[0], name, name_len); |
197 | e->name[name_len - 1] = '\0'; | |
457a6b58 MD |
198 | e->loglevel_type = loglevel_type; |
199 | e->loglevel = loglevel; | |
8165c8da MD |
200 | cds_hlist_add_head(&e->node, head); |
201 | e->event = event; | |
202 | event->pending_probe = e; | |
203 | return 0; | |
204 | } | |
205 | ||
206 | /* | |
207 | * remove a pending probe. called when at event teardown and when an | |
208 | * event is fixed (probe is loaded). | |
209 | * called with session mutex held. | |
210 | */ | |
211 | static | |
212 | void remove_pending_probe(struct ust_pending_probe *e) | |
213 | { | |
214 | if (!e) | |
215 | return; | |
216 | cds_hlist_del(&e->node); | |
217 | free(e); | |
218 | } | |
219 | ||
220 | /* | |
221 | * Called at library load: connect the probe on the events pending on | |
222 | * probe load. | |
223 | * called with session mutex held. | |
224 | */ | |
225 | int pending_probe_fix_events(const struct lttng_event_desc *desc) | |
226 | { | |
227 | struct cds_hlist_head *head; | |
228 | struct cds_hlist_node *node, *p; | |
229 | struct ust_pending_probe *e; | |
230 | const char *name = desc->name; | |
8165c8da | 231 | int ret = 0; |
7ee3cc56 | 232 | struct lttng_ust_event event_param; |
48bf7c27 | 233 | size_t name_len = strlen(name) + 1; |
ff412fb5 | 234 | uint32_t hash; |
8165c8da | 235 | |
e6c12e3d MD |
236 | /* Wildcard */ |
237 | { | |
238 | struct wildcard_entry *wildcard; | |
239 | ||
457a6b58 | 240 | wildcard = match_wildcard(desc); |
e6c12e3d MD |
241 | if (strcmp(desc->name, "lttng_ust:metadata") && wildcard) { |
242 | struct session_wildcard *sw; | |
243 | ||
244 | cds_list_for_each_entry(sw, &wildcard->session_list, | |
245 | session_list) { | |
246 | struct ltt_event *ev; | |
247 | int ret; | |
248 | ||
249 | memcpy(&event_param, &sw->event_param, | |
250 | sizeof(event_param)); | |
7a673d99 | 251 | strncpy(event_param.name, |
e6c12e3d MD |
252 | desc->name, |
253 | sizeof(event_param.name)); | |
7a673d99 | 254 | event_param.name[sizeof(event_param.name) - 1] = '\0'; |
e6c12e3d MD |
255 | /* create event */ |
256 | ret = ltt_event_create(sw->chan, | |
257 | &event_param, NULL, | |
258 | &ev); | |
259 | if (ret) { | |
260 | DBG("Error creating event"); | |
261 | continue; | |
262 | } | |
263 | cds_list_add(&ev->wildcard_list, | |
264 | &sw->events); | |
265 | } | |
266 | } | |
267 | } | |
268 | ||
48bf7c27 MD |
269 | if (name_len > LTTNG_UST_SYM_NAME_LEN) { |
270 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN); | |
271 | name_len = LTTNG_UST_SYM_NAME_LEN; | |
ff412fb5 | 272 | } |
48bf7c27 | 273 | hash = jhash(name, name_len - 1, 0); |
8165c8da MD |
274 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
275 | cds_hlist_for_each_entry_safe(e, node, p, head, node) { | |
276 | struct ltt_event *event; | |
277 | struct ltt_channel *chan; | |
278 | ||
fe2d02f4 | 279 | if (!ltt_loglevel_match(desc, |
457a6b58 MD |
280 | e->loglevel_type, |
281 | e->loglevel)) { | |
282 | continue; | |
283 | } | |
284 | if (strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) { | |
285 | continue; | |
286 | } | |
fe2d02f4 | 287 | event = e->event; |
8165c8da MD |
288 | chan = event->chan; |
289 | assert(!event->desc); | |
290 | event->desc = desc; | |
291 | event->pending_probe = NULL; | |
292 | remove_pending_probe(e); | |
293 | ret |= __tracepoint_probe_register(name, | |
294 | event->desc->probe_callback, | |
67e5f391 | 295 | event, event->desc->signature); |
636c5aa4 MD |
296 | if (ret) |
297 | continue; | |
298 | event->id = chan->free_event_id++; | |
8165c8da MD |
299 | ret |= _ltt_event_metadata_statedump(chan->session, chan, |
300 | event); | |
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; | |
313 | ||
b5234c06 | 314 | session = zmalloc(sizeof(struct ltt_session)); |
8020ceb5 MD |
315 | if (!session) |
316 | return NULL; | |
b5234c06 MD |
317 | CDS_INIT_LIST_HEAD(&session->chan); |
318 | CDS_INIT_LIST_HEAD(&session->events); | |
e6c12e3d | 319 | CDS_INIT_LIST_HEAD(&session->wildcards); |
578ce73a | 320 | uuid_generate(session->uuid); |
b5234c06 | 321 | cds_list_add(&session->list, &sessions); |
8020ceb5 MD |
322 | return session; |
323 | } | |
324 | ||
325 | void ltt_session_destroy(struct ltt_session *session) | |
326 | { | |
327 | struct ltt_channel *chan, *tmpchan; | |
328 | struct ltt_event *event, *tmpevent; | |
e6c12e3d | 329 | struct session_wildcard *wildcard, *tmpwildcard; |
8020ceb5 MD |
330 | int ret; |
331 | ||
b5234c06 MD |
332 | CMM_ACCESS_ONCE(session->active) = 0; |
333 | cds_list_for_each_entry(event, &session->events, list) { | |
8020ceb5 MD |
334 | ret = _ltt_event_unregister(event); |
335 | WARN_ON(ret); | |
336 | } | |
337 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e6c12e3d MD |
338 | cds_list_for_each_entry_safe(wildcard, tmpwildcard, &session->wildcards, list) |
339 | _ltt_wildcard_destroy(wildcard); | |
b5234c06 | 340 | cds_list_for_each_entry_safe(event, tmpevent, &session->events, list) |
8020ceb5 | 341 | _ltt_event_destroy(event); |
b5234c06 | 342 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list) |
8020ceb5 | 343 | _ltt_channel_destroy(chan); |
b5234c06 | 344 | cds_list_del(&session->list); |
b5234c06 | 345 | free(session); |
8020ceb5 MD |
346 | } |
347 | ||
976fe9ea | 348 | int ltt_session_enable(struct ltt_session *session) |
8020ceb5 MD |
349 | { |
350 | int ret = 0; | |
351 | struct ltt_channel *chan; | |
352 | ||
8020ceb5 MD |
353 | if (session->active) { |
354 | ret = -EBUSY; | |
355 | goto end; | |
356 | } | |
357 | ||
358 | /* | |
359 | * Snapshot the number of events per channel to know the type of header | |
360 | * we need to use. | |
361 | */ | |
b5234c06 | 362 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
363 | if (chan->header_type) |
364 | continue; /* don't change it if session stop/restart */ | |
365 | if (chan->free_event_id < 31) | |
366 | chan->header_type = 1; /* compact */ | |
367 | else | |
368 | chan->header_type = 2; /* large */ | |
369 | } | |
370 | ||
b5234c06 MD |
371 | CMM_ACCESS_ONCE(session->active) = 1; |
372 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
8020ceb5 | 373 | ret = _ltt_session_metadata_statedump(session); |
4b4de73e | 374 | if (ret) |
b5234c06 | 375 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 376 | end: |
8020ceb5 MD |
377 | return ret; |
378 | } | |
379 | ||
976fe9ea | 380 | int ltt_session_disable(struct ltt_session *session) |
8020ceb5 MD |
381 | { |
382 | int ret = 0; | |
383 | ||
8020ceb5 MD |
384 | if (!session->active) { |
385 | ret = -EBUSY; | |
386 | goto end; | |
387 | } | |
b5234c06 | 388 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 389 | end: |
8020ceb5 MD |
390 | return ret; |
391 | } | |
392 | ||
976fe9ea MD |
393 | int ltt_channel_enable(struct ltt_channel *channel) |
394 | { | |
395 | int old; | |
396 | ||
9beb36ba MD |
397 | if (channel == channel->session->metadata) |
398 | return -EPERM; | |
b5234c06 | 399 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
400 | if (old) |
401 | return -EEXIST; | |
402 | return 0; | |
403 | } | |
404 | ||
405 | int ltt_channel_disable(struct ltt_channel *channel) | |
406 | { | |
407 | int old; | |
408 | ||
9beb36ba MD |
409 | if (channel == channel->session->metadata) |
410 | return -EPERM; | |
b5234c06 | 411 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
412 | if (!old) |
413 | return -EEXIST; | |
414 | return 0; | |
415 | } | |
416 | ||
417 | int ltt_event_enable(struct ltt_event *event) | |
418 | { | |
419 | int old; | |
420 | ||
9beb36ba MD |
421 | if (event->chan == event->chan->session->metadata) |
422 | return -EPERM; | |
b5234c06 | 423 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
424 | if (old) |
425 | return -EEXIST; | |
426 | return 0; | |
427 | } | |
428 | ||
429 | int ltt_event_disable(struct ltt_event *event) | |
430 | { | |
431 | int old; | |
432 | ||
9beb36ba MD |
433 | if (event->chan == event->chan->session->metadata) |
434 | return -EPERM; | |
b5234c06 | 435 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
436 | if (!old) |
437 | return -EEXIST; | |
438 | return 0; | |
439 | } | |
440 | ||
8020ceb5 MD |
441 | struct ltt_channel *ltt_channel_create(struct ltt_session *session, |
442 | const char *transport_name, | |
443 | void *buf_addr, | |
444 | size_t subbuf_size, size_t num_subbuf, | |
445 | unsigned int switch_timer_interval, | |
193183fb | 446 | unsigned int read_timer_interval, |
ef9ff354 MD |
447 | int **shm_fd, int **wait_fd, |
448 | uint64_t **memory_map_size, | |
d028eddb | 449 | struct ltt_channel *chan_priv_init) |
8020ceb5 | 450 | { |
a3f61e7f | 451 | struct ltt_channel *chan = NULL; |
8020ceb5 MD |
452 | struct ltt_transport *transport; |
453 | ||
8020ceb5 MD |
454 | if (session->been_active) |
455 | goto active; /* Refuse to add channel to active session */ | |
456 | transport = ltt_transport_find(transport_name); | |
457 | if (!transport) { | |
b5234c06 | 458 | DBG("LTTng transport %s not found\n", |
8020ceb5 MD |
459 | transport_name); |
460 | goto notransport; | |
461 | } | |
d028eddb MD |
462 | chan_priv_init->id = session->free_chan_id++; |
463 | chan_priv_init->session = session; | |
8020ceb5 MD |
464 | /* |
465 | * Note: the channel creation op already writes into the packet | |
466 | * headers. Therefore the "chan" information used as input | |
467 | * should be already accessible. | |
468 | */ | |
e7372d13 | 469 | chan = transport->ops.channel_create(transport_name, buf_addr, |
8020ceb5 | 470 | subbuf_size, num_subbuf, switch_timer_interval, |
193183fb | 471 | read_timer_interval, shm_fd, wait_fd, |
d028eddb | 472 | memory_map_size, chan_priv_init); |
a3f61e7f | 473 | if (!chan) |
8020ceb5 | 474 | goto create_error; |
976fe9ea | 475 | chan->enabled = 1; |
8020ceb5 | 476 | chan->ops = &transport->ops; |
b5234c06 | 477 | cds_list_add(&chan->list, &session->chan); |
8020ceb5 MD |
478 | return chan; |
479 | ||
480 | create_error: | |
8020ceb5 MD |
481 | notransport: |
482 | active: | |
8020ceb5 MD |
483 | return NULL; |
484 | } | |
485 | ||
486 | /* | |
487 | * Only used internally at session destruction. | |
488 | */ | |
489 | static | |
490 | void _ltt_channel_destroy(struct ltt_channel *chan) | |
491 | { | |
b5234c06 | 492 | cds_list_del(&chan->list); |
8020ceb5 | 493 | lttng_destroy_context(chan->ctx); |
a3f61e7f | 494 | chan->ops->channel_destroy(chan); |
8020ceb5 MD |
495 | } |
496 | ||
497 | /* | |
498 | * Supports event creation while tracing session is active. | |
499 | */ | |
576599a0 MD |
500 | int ltt_event_create(struct ltt_channel *chan, |
501 | struct lttng_ust_event *event_param, | |
0264ec6c | 502 | void (*filter)(struct ltt_event *event), |
576599a0 | 503 | struct ltt_event **_event) |
8020ceb5 | 504 | { |
457a6b58 | 505 | const struct lttng_event_desc *desc = NULL; /* silence gcc */ |
8020ceb5 | 506 | struct ltt_event *event; |
576599a0 | 507 | int ret = 0; |
8020ceb5 | 508 | |
38eb0baa | 509 | if (chan->used_event_id == -1U) { |
576599a0 | 510 | ret = -ENOMEM; |
8020ceb5 | 511 | goto full; |
576599a0 | 512 | } |
8020ceb5 MD |
513 | /* |
514 | * This is O(n^2) (for each event, the loop is called at event | |
515 | * creation). Might require a hash if we have lots of events. | |
516 | */ | |
576599a0 | 517 | cds_list_for_each_entry(event, &chan->session->events, list) { |
ff412fb5 MD |
518 | if (event->desc && !strncmp(event->desc->name, |
519 | event_param->name, | |
520 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
576599a0 | 521 | ret = -EEXIST; |
8020ceb5 | 522 | goto exist; |
576599a0 MD |
523 | } |
524 | } | |
457a6b58 MD |
525 | |
526 | /* | |
527 | * Check if loglevel match. Refuse to connect event if not. | |
528 | */ | |
529 | if (event_param->instrumentation == LTTNG_UST_TRACEPOINT) { | |
530 | desc = ltt_event_get(event_param->name); | |
fe2d02f4 MD |
531 | if (desc) { |
532 | if (!ltt_loglevel_match(desc, | |
533 | event_param->loglevel_type, | |
534 | event_param->loglevel)) { | |
535 | ret = -EPERM; | |
536 | goto no_loglevel_match; | |
537 | } | |
457a6b58 | 538 | } |
fe2d02f4 MD |
539 | /* |
540 | * If descriptor is not there, it will be added to | |
541 | * pending probes. | |
542 | */ | |
457a6b58 | 543 | } |
b5234c06 | 544 | event = zmalloc(sizeof(struct ltt_event)); |
576599a0 MD |
545 | if (!event) { |
546 | ret = -ENOMEM; | |
8020ceb5 | 547 | goto cache_error; |
576599a0 | 548 | } |
8020ceb5 MD |
549 | event->chan = chan; |
550 | event->filter = filter; | |
8165c8da MD |
551 | /* |
552 | * used_event_id counts the maximum number of event IDs that can | |
553 | * register if all probes register. | |
554 | */ | |
555 | chan->used_event_id++; | |
976fe9ea | 556 | event->enabled = 1; |
8020ceb5 MD |
557 | event->instrumentation = event_param->instrumentation; |
558 | /* Populate ltt_event structure before tracepoint registration. */ | |
b5234c06 | 559 | cmm_smp_wmb(); |
8020ceb5 | 560 | switch (event_param->instrumentation) { |
b5234c06 | 561 | case LTTNG_UST_TRACEPOINT: |
457a6b58 | 562 | event->desc = desc; |
8165c8da MD |
563 | if (event->desc) { |
564 | ret = __tracepoint_probe_register(event_param->name, | |
565 | event->desc->probe_callback, | |
67e5f391 | 566 | event, event->desc->signature); |
8165c8da MD |
567 | if (ret) |
568 | goto register_error; | |
569 | event->id = chan->free_event_id++; | |
570 | } else { | |
571 | /* | |
572 | * If the probe is not present, event->desc stays NULL, | |
573 | * waiting for the probe to register, and the event->id | |
574 | * stays unallocated. | |
575 | */ | |
457a6b58 MD |
576 | ret = add_pending_probe(event, event_param->name, |
577 | event_param->loglevel_type, | |
578 | event_param->loglevel); | |
8165c8da MD |
579 | if (ret) |
580 | goto add_pending_error; | |
581 | } | |
8020ceb5 | 582 | break; |
8020ceb5 MD |
583 | default: |
584 | WARN_ON_ONCE(1); | |
585 | } | |
8165c8da MD |
586 | if (event->desc) { |
587 | ret = _ltt_event_metadata_statedump(chan->session, chan, event); | |
588 | if (ret) | |
589 | goto statedump_error; | |
590 | } | |
b5234c06 | 591 | cds_list_add(&event->list, &chan->session->events); |
576599a0 MD |
592 | *_event = event; |
593 | return 0; | |
8020ceb5 MD |
594 | |
595 | statedump_error: | |
8165c8da MD |
596 | if (event->desc) { |
597 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_param->name, | |
598 | event->desc->probe_callback, | |
599 | event)); | |
600 | ltt_event_put(event->desc); | |
601 | } | |
602 | add_pending_error: | |
8020ceb5 | 603 | register_error: |
b5234c06 | 604 | free(event); |
8020ceb5 | 605 | cache_error: |
457a6b58 | 606 | no_loglevel_match: |
8020ceb5 MD |
607 | exist: |
608 | full: | |
576599a0 | 609 | return ret; |
8020ceb5 MD |
610 | } |
611 | ||
612 | /* | |
613 | * Only used internally at session destruction. | |
614 | */ | |
615 | int _ltt_event_unregister(struct ltt_event *event) | |
616 | { | |
617 | int ret = -EINVAL; | |
618 | ||
619 | switch (event->instrumentation) { | |
b5234c06 | 620 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
621 | if (event->desc) { |
622 | ret = __tracepoint_probe_unregister(event->desc->name, | |
623 | event->desc->probe_callback, | |
624 | event); | |
625 | if (ret) | |
626 | return ret; | |
627 | } else { | |
628 | remove_pending_probe(event->pending_probe); | |
629 | ret = 0; | |
630 | } | |
8020ceb5 | 631 | break; |
8020ceb5 MD |
632 | default: |
633 | WARN_ON_ONCE(1); | |
634 | } | |
635 | return ret; | |
636 | } | |
637 | ||
638 | /* | |
639 | * Only used internally at session destruction. | |
640 | */ | |
641 | static | |
642 | void _ltt_event_destroy(struct ltt_event *event) | |
643 | { | |
644 | switch (event->instrumentation) { | |
b5234c06 | 645 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
646 | if (event->desc) { |
647 | ltt_event_put(event->desc); | |
648 | } | |
8020ceb5 | 649 | break; |
8020ceb5 MD |
650 | default: |
651 | WARN_ON_ONCE(1); | |
652 | } | |
b5234c06 | 653 | cds_list_del(&event->list); |
8020ceb5 | 654 | lttng_destroy_context(event->ctx); |
b5234c06 | 655 | free(event); |
8020ceb5 MD |
656 | } |
657 | ||
658 | /* | |
659 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 660 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
661 | * remaining space left in packet and write, since mutual exclusion |
662 | * protects us from concurrent writes. | |
663 | */ | |
664 | int lttng_metadata_printf(struct ltt_session *session, | |
665 | const char *fmt, ...) | |
666 | { | |
4cfec15c | 667 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
8020ceb5 | 668 | struct ltt_channel *chan = session->metadata; |
b5234c06 | 669 | char *str = NULL; |
8020ceb5 MD |
670 | int ret = 0, waitret; |
671 | size_t len, reserve_len, pos; | |
672 | va_list ap; | |
673 | ||
b5234c06 | 674 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
675 | |
676 | va_start(ap, fmt); | |
b5234c06 | 677 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 678 | va_end(ap); |
b5234c06 | 679 | if (ret < 0) |
8020ceb5 MD |
680 | return -ENOMEM; |
681 | ||
682 | len = strlen(str); | |
683 | pos = 0; | |
684 | ||
685 | for (pos = 0; pos < len; pos += reserve_len) { | |
686 | reserve_len = min_t(size_t, | |
1d498196 | 687 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
688 | len - pos); |
689 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 690 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
691 | /* |
692 | * We don't care about metadata buffer's records lost | |
693 | * count, because we always retry here. Report error if | |
694 | * we need to bail out after timeout or being | |
695 | * interrupted. | |
696 | */ | |
b5234c06 | 697 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
698 | ({ |
699 | ret = chan->ops->event_reserve(&ctx, 0); | |
700 | ret != -ENOBUFS || !ret; | |
701 | }), | |
b5234c06 | 702 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 703 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
704 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
705 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 706 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 707 | if (waitret == -EINTR) |
8020ceb5 MD |
708 | ret = waitret; |
709 | goto end; | |
710 | } | |
711 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
712 | chan->ops->event_commit(&ctx); | |
713 | } | |
714 | end: | |
b5234c06 | 715 | free(str); |
8020ceb5 MD |
716 | return ret; |
717 | } | |
718 | ||
719 | static | |
720 | int _ltt_field_statedump(struct ltt_session *session, | |
721 | const struct lttng_event_field *field) | |
722 | { | |
723 | int ret = 0; | |
724 | ||
725 | switch (field->type.atype) { | |
726 | case atype_integer: | |
727 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 728 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
729 | field->type.u.basic.integer.size, |
730 | field->type.u.basic.integer.alignment, | |
731 | field->type.u.basic.integer.signedness, | |
732 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
733 | ? "none" | |
734 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
735 | ? "UTF8" | |
736 | : "ASCII", | |
737 | field->type.u.basic.integer.base, | |
8a98a75d | 738 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
739 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
740 | #else | |
741 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
742 | #endif | |
743 | field->name); | |
744 | break; | |
745 | case atype_float: | |
746 | ret = lttng_metadata_printf(session, | |
8a98a75d | 747 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
748 | field->type.u.basic._float.exp_dig, |
749 | field->type.u.basic._float.mant_dig, | |
750 | field->type.u.basic._float.alignment, | |
8a98a75d | 751 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
752 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
753 | #else | |
754 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
755 | #endif | |
756 | field->name); | |
757 | break; | |
758 | case atype_enum: | |
759 | ret = lttng_metadata_printf(session, | |
760 | " %s %s;\n", | |
761 | field->type.u.basic.enumeration.name, | |
762 | field->name); | |
763 | break; | |
764 | case atype_array: | |
765 | { | |
766 | const struct lttng_basic_type *elem_type; | |
767 | ||
768 | elem_type = &field->type.u.array.elem_type; | |
769 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 770 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
771 | elem_type->u.basic.integer.size, |
772 | elem_type->u.basic.integer.alignment, | |
773 | elem_type->u.basic.integer.signedness, | |
774 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
775 | ? "none" | |
776 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
777 | ? "UTF8" | |
778 | : "ASCII", | |
779 | elem_type->u.basic.integer.base, | |
8a98a75d | 780 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
781 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
782 | #else | |
783 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
784 | #endif | |
785 | field->name, field->type.u.array.length); | |
786 | break; | |
787 | } | |
788 | case atype_sequence: | |
789 | { | |
790 | const struct lttng_basic_type *elem_type; | |
791 | const struct lttng_basic_type *length_type; | |
792 | ||
793 | elem_type = &field->type.u.sequence.elem_type; | |
794 | length_type = &field->type.u.sequence.length_type; | |
795 | ret = lttng_metadata_printf(session, | |
796 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
797 | length_type->u.basic.integer.size, | |
798 | (unsigned int) length_type->u.basic.integer.alignment, | |
799 | length_type->u.basic.integer.signedness, | |
800 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
801 | ? "none" | |
802 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
803 | ? "UTF8" | |
804 | : "ASCII"), | |
805 | length_type->u.basic.integer.base, | |
8a98a75d | 806 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
807 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
808 | #else | |
809 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
810 | #endif | |
811 | field->name); | |
812 | if (ret) | |
813 | return ret; | |
814 | ||
815 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 816 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
817 | elem_type->u.basic.integer.size, |
818 | (unsigned int) elem_type->u.basic.integer.alignment, | |
819 | elem_type->u.basic.integer.signedness, | |
820 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
821 | ? "none" | |
822 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
823 | ? "UTF8" | |
824 | : "ASCII"), | |
825 | elem_type->u.basic.integer.base, | |
8a98a75d | 826 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
827 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
828 | #else | |
829 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
830 | #endif | |
831 | field->name, | |
832 | field->name); | |
833 | break; | |
834 | } | |
835 | ||
836 | case atype_string: | |
837 | /* Default encoding is UTF8 */ | |
838 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 839 | " string%s _%s;\n", |
8020ceb5 MD |
840 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
841 | " { encoding = ASCII; }" : "", | |
842 | field->name); | |
843 | break; | |
844 | default: | |
845 | WARN_ON_ONCE(1); | |
846 | return -EINVAL; | |
847 | } | |
848 | return ret; | |
849 | } | |
850 | ||
851 | static | |
852 | int _ltt_context_metadata_statedump(struct ltt_session *session, | |
853 | struct lttng_ctx *ctx) | |
854 | { | |
855 | int ret = 0; | |
856 | int i; | |
857 | ||
858 | if (!ctx) | |
859 | return 0; | |
860 | for (i = 0; i < ctx->nr_fields; i++) { | |
861 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
862 | ||
863 | ret = _ltt_field_statedump(session, &field->event_field); | |
864 | if (ret) | |
865 | return ret; | |
866 | } | |
867 | return ret; | |
868 | } | |
869 | ||
870 | static | |
871 | int _ltt_fields_metadata_statedump(struct ltt_session *session, | |
872 | struct ltt_event *event) | |
873 | { | |
874 | const struct lttng_event_desc *desc = event->desc; | |
875 | int ret = 0; | |
876 | int i; | |
877 | ||
878 | for (i = 0; i < desc->nr_fields; i++) { | |
879 | const struct lttng_event_field *field = &desc->fields[i]; | |
880 | ||
881 | ret = _ltt_field_statedump(session, field); | |
882 | if (ret) | |
883 | return ret; | |
884 | } | |
885 | return ret; | |
886 | } | |
887 | ||
888 | static | |
889 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
890 | struct ltt_channel *chan, | |
891 | struct ltt_event *event) | |
892 | { | |
893 | int ret = 0; | |
8155c5e8 | 894 | int loglevel = TRACE_DEFAULT; |
8020ceb5 | 895 | |
b5234c06 | 896 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
897 | return 0; |
898 | if (chan == session->metadata) | |
899 | return 0; | |
8165c8da MD |
900 | /* |
901 | * Don't print events for which probe load is pending. | |
902 | */ | |
903 | if (!event->desc) | |
904 | return 0; | |
8020ceb5 MD |
905 | |
906 | ret = lttng_metadata_printf(session, | |
907 | "event {\n" | |
7083f0fe | 908 | " name = \"%s\";\n" |
8020ceb5 MD |
909 | " id = %u;\n" |
910 | " stream_id = %u;\n", | |
911 | event->desc->name, | |
912 | event->id, | |
913 | event->chan->id); | |
914 | if (ret) | |
915 | goto end; | |
916 | ||
8155c5e8 MD |
917 | if (event->desc->loglevel) |
918 | loglevel = *(*event->desc->loglevel); | |
919 | ||
920 | ret = lttng_metadata_printf(session, | |
921 | " loglevel = %d;\n", | |
922 | loglevel); | |
923 | if (ret) | |
924 | goto end; | |
e6c12e3d | 925 | |
8020ceb5 MD |
926 | if (event->ctx) { |
927 | ret = lttng_metadata_printf(session, | |
928 | " context := struct {\n"); | |
929 | if (ret) | |
930 | goto end; | |
931 | } | |
932 | ret = _ltt_context_metadata_statedump(session, event->ctx); | |
933 | if (ret) | |
934 | goto end; | |
935 | if (event->ctx) { | |
936 | ret = lttng_metadata_printf(session, | |
937 | " };\n"); | |
938 | if (ret) | |
939 | goto end; | |
940 | } | |
941 | ||
942 | ret = lttng_metadata_printf(session, | |
943 | " fields := struct {\n" | |
944 | ); | |
945 | if (ret) | |
946 | goto end; | |
947 | ||
948 | ret = _ltt_fields_metadata_statedump(session, event); | |
949 | if (ret) | |
950 | goto end; | |
951 | ||
952 | /* | |
953 | * LTTng space reservation can only reserve multiples of the | |
954 | * byte size. | |
955 | */ | |
956 | ret = lttng_metadata_printf(session, | |
957 | " };\n" | |
958 | "};\n\n"); | |
959 | if (ret) | |
960 | goto end; | |
961 | ||
962 | event->metadata_dumped = 1; | |
963 | end: | |
964 | return ret; | |
965 | ||
966 | } | |
967 | ||
968 | static | |
969 | int _ltt_channel_metadata_statedump(struct ltt_session *session, | |
970 | struct ltt_channel *chan) | |
971 | { | |
972 | int ret = 0; | |
973 | ||
b5234c06 | 974 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
975 | return 0; |
976 | if (chan == session->metadata) | |
977 | return 0; | |
978 | ||
979 | WARN_ON_ONCE(!chan->header_type); | |
980 | ret = lttng_metadata_printf(session, | |
981 | "stream {\n" | |
982 | " id = %u;\n" | |
983 | " event.header := %s;\n" | |
984 | " packet.context := struct packet_context;\n", | |
985 | chan->id, | |
986 | chan->header_type == 1 ? "struct event_header_compact" : | |
987 | "struct event_header_large"); | |
988 | if (ret) | |
989 | goto end; | |
990 | ||
991 | if (chan->ctx) { | |
992 | ret = lttng_metadata_printf(session, | |
993 | " event.context := struct {\n"); | |
994 | if (ret) | |
995 | goto end; | |
996 | } | |
997 | ret = _ltt_context_metadata_statedump(session, chan->ctx); | |
998 | if (ret) | |
999 | goto end; | |
1000 | if (chan->ctx) { | |
1001 | ret = lttng_metadata_printf(session, | |
1002 | " };\n"); | |
1003 | if (ret) | |
1004 | goto end; | |
1005 | } | |
1006 | ||
1007 | ret = lttng_metadata_printf(session, | |
1008 | "};\n\n"); | |
1009 | ||
1010 | chan->metadata_dumped = 1; | |
1011 | end: | |
1012 | return ret; | |
1013 | } | |
1014 | ||
1015 | static | |
1016 | int _ltt_stream_packet_context_declare(struct ltt_session *session) | |
1017 | { | |
1018 | return lttng_metadata_printf(session, | |
1019 | "struct packet_context {\n" | |
28b12049 MD |
1020 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1021 | " uint64_clock_monotonic_t timestamp_end;\n" | |
8020ceb5 MD |
1022 | " uint32_t events_discarded;\n" |
1023 | " uint32_t content_size;\n" | |
1024 | " uint32_t packet_size;\n" | |
1025 | " uint32_t cpu_id;\n" | |
1026 | "};\n\n" | |
1027 | ); | |
1028 | } | |
1029 | ||
1030 | /* | |
1031 | * Compact header: | |
1032 | * id: range: 0 - 30. | |
1033 | * id 31 is reserved to indicate an extended header. | |
1034 | * | |
1035 | * Large header: | |
1036 | * id: range: 0 - 65534. | |
1037 | * id 65535 is reserved to indicate an extended header. | |
1038 | */ | |
1039 | static | |
1040 | int _ltt_event_header_declare(struct ltt_session *session) | |
1041 | { | |
1042 | return lttng_metadata_printf(session, | |
1043 | "struct event_header_compact {\n" | |
1044 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1045 | " variant <id> {\n" | |
1046 | " struct {\n" | |
28b12049 | 1047 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1048 | " } compact;\n" |
1049 | " struct {\n" | |
1050 | " uint32_t id;\n" | |
28b12049 | 1051 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1052 | " } extended;\n" |
1053 | " } v;\n" | |
1054 | "} align(%u);\n" | |
1055 | "\n" | |
1056 | "struct event_header_large {\n" | |
1057 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1058 | " variant <id> {\n" | |
1059 | " struct {\n" | |
28b12049 | 1060 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1061 | " } compact;\n" |
1062 | " struct {\n" | |
1063 | " uint32_t id;\n" | |
28b12049 | 1064 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1065 | " } extended;\n" |
1066 | " } v;\n" | |
1067 | "} align(%u);\n\n", | |
1dbfff0c MD |
1068 | lttng_alignof(uint32_t) * CHAR_BIT, |
1069 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1070 | ); |
1071 | } | |
1072 | ||
28b12049 MD |
1073 | /* |
1074 | * Approximation of NTP time of day to clock monotonic correlation, | |
1075 | * taken at start of trace. | |
1076 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1077 | * in future versions. | |
1078 | */ | |
1079 | static | |
1080 | uint64_t measure_clock_offset(void) | |
1081 | { | |
1082 | uint64_t offset, monotonic[2], realtime; | |
1083 | struct timespec rts = { 0, 0 }; | |
1084 | int ret; | |
1085 | ||
1086 | monotonic[0] = trace_clock_read64(); | |
1087 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1088 | if (ret < 0) | |
1089 | return 0; | |
1090 | monotonic[1] = trace_clock_read64(); | |
1091 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
17ec046a | 1092 | realtime = (uint64_t) rts.tv_sec * 1000000000ULL; |
28b12049 MD |
1093 | realtime += rts.tv_nsec; |
1094 | offset = realtime - offset; | |
1095 | return offset; | |
1096 | } | |
1097 | ||
8020ceb5 MD |
1098 | /* |
1099 | * Output metadata into this session's metadata buffers. | |
1100 | */ | |
1101 | static | |
1102 | int _ltt_session_metadata_statedump(struct ltt_session *session) | |
1103 | { | |
b5234c06 | 1104 | unsigned char *uuid_c = session->uuid; |
578ce73a | 1105 | char uuid_s[37], clock_uuid_s[CLOCK_UUID_LEN]; |
8020ceb5 MD |
1106 | struct ltt_channel *chan; |
1107 | struct ltt_event *event; | |
1108 | int ret = 0; | |
4c1ee94e | 1109 | char procname[PROCNAME_LEN] = ""; |
8020ceb5 | 1110 | |
b5234c06 | 1111 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1112 | return 0; |
1113 | if (session->metadata_dumped) | |
1114 | goto skip_session; | |
1115 | if (!session->metadata) { | |
b5234c06 | 1116 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1117 | return -EPERM; |
1118 | } | |
1119 | ||
1120 | snprintf(uuid_s, sizeof(uuid_s), | |
1121 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1122 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1123 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1124 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1125 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1126 | ||
1127 | ret = lttng_metadata_printf(session, | |
1128 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1129 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1130 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1131 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
1132 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" | |
1133 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1134 | "\n" | |
1135 | "trace {\n" | |
1136 | " major = %u;\n" | |
1137 | " minor = %u;\n" | |
1138 | " uuid = \"%s\";\n" | |
1139 | " byte_order = %s;\n" | |
1140 | " packet.header := struct {\n" | |
1141 | " uint32_t magic;\n" | |
1142 | " uint8_t uuid[16];\n" | |
1143 | " uint32_t stream_id;\n" | |
1144 | " };\n" | |
1145 | "};\n\n", | |
1dbfff0c MD |
1146 | lttng_alignof(uint8_t) * CHAR_BIT, |
1147 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1148 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1149 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2694975d MD |
1150 | CTF_SPEC_MAJOR, |
1151 | CTF_SPEC_MINOR, | |
8020ceb5 | 1152 | uuid_s, |
8a98a75d | 1153 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1154 | "be" |
1155 | #else | |
1156 | "le" | |
1157 | #endif | |
1158 | ); | |
1159 | if (ret) | |
1160 | goto end; | |
1161 | ||
b020e504 | 1162 | /* ignore error, just use empty string if error. */ |
4c1ee94e MD |
1163 | (void) prctl(PR_GET_NAME, (unsigned long) procname, 0, 0, 0); |
1164 | procname[PROCNAME_LEN - 1] = '\0'; | |
b020e504 MD |
1165 | ret = lttng_metadata_printf(session, |
1166 | "env {\n" | |
1167 | " vpid = %d;\n" | |
1168 | " procname = \"%s\";\n" | |
2694975d MD |
1169 | " domain = \"ust\";\n" |
1170 | " tracer_name = \"lttng-ust\";\n" | |
1171 | " tracer_major = %u;\n" | |
1172 | " tracer_minor = %u;\n" | |
1173 | " tracer_patchlevel = %u;\n" | |
b020e504 MD |
1174 | "};\n\n", |
1175 | (int) getpid(), | |
1176 | procname, | |
2694975d MD |
1177 | LTTNG_UST_MAJOR_VERSION, |
1178 | LTTNG_UST_MINOR_VERSION, | |
1179 | LTTNG_UST_PATCHLEVEL_VERSION | |
b020e504 MD |
1180 | ); |
1181 | if (ret) | |
1182 | goto end; | |
1183 | ||
28b12049 MD |
1184 | ret = lttng_metadata_printf(session, |
1185 | "clock {\n" | |
939950af MD |
1186 | " name = %s;\n", |
1187 | "monotonic" | |
1188 | ); | |
1189 | if (ret) | |
1190 | goto end; | |
1191 | ||
1192 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1193 | ret = lttng_metadata_printf(session, | |
1194 | " uuid = \"%s\";\n", | |
1195 | clock_uuid_s | |
1196 | ); | |
1197 | if (ret) | |
1198 | goto end; | |
1199 | } | |
1200 | ||
1201 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1202 | " description = \"Monotonic Clock\";\n" |
1203 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1204 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1205 | " offset = %" PRIu64 ";\n" | |
1206 | "};\n\n", | |
28b12049 MD |
1207 | trace_clock_freq(), |
1208 | measure_clock_offset() | |
1209 | ); | |
1210 | if (ret) | |
1211 | goto end; | |
1212 | ||
1213 | ret = lttng_metadata_printf(session, | |
1214 | "typealias integer {\n" | |
1215 | " size = 27; align = 1; signed = false;\n" | |
1216 | " map = clock.monotonic.value;\n" | |
1217 | "} := uint27_clock_monotonic_t;\n" | |
1218 | "\n" | |
1219 | "typealias integer {\n" | |
1220 | " size = 32; align = %u; signed = false;\n" | |
1221 | " map = clock.monotonic.value;\n" | |
1222 | "} := uint32_clock_monotonic_t;\n" | |
1223 | "\n" | |
1224 | "typealias integer {\n" | |
1225 | " size = 64; align = %u; signed = false;\n" | |
1226 | " map = clock.monotonic.value;\n" | |
1227 | "} := uint64_clock_monotonic_t;\n\n", | |
1228 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1229 | lttng_alignof(uint64_t) * CHAR_BIT | |
1230 | ); | |
1231 | if (ret) | |
1232 | goto end; | |
1233 | ||
8020ceb5 MD |
1234 | ret = _ltt_stream_packet_context_declare(session); |
1235 | if (ret) | |
1236 | goto end; | |
1237 | ||
1238 | ret = _ltt_event_header_declare(session); | |
1239 | if (ret) | |
1240 | goto end; | |
1241 | ||
1242 | skip_session: | |
b5234c06 | 1243 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
1244 | ret = _ltt_channel_metadata_statedump(session, chan); |
1245 | if (ret) | |
1246 | goto end; | |
1247 | } | |
1248 | ||
b5234c06 | 1249 | cds_list_for_each_entry(event, &session->events, list) { |
8020ceb5 MD |
1250 | ret = _ltt_event_metadata_statedump(session, event->chan, event); |
1251 | if (ret) | |
1252 | goto end; | |
1253 | } | |
1254 | session->metadata_dumped = 1; | |
1255 | end: | |
1256 | return ret; | |
1257 | } | |
1258 | ||
003fedf4 | 1259 | void lttng_ust_events_exit(void) |
8020ceb5 MD |
1260 | { |
1261 | struct ltt_session *session, *tmpsession; | |
1262 | ||
b5234c06 | 1263 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, list) |
8020ceb5 | 1264 | ltt_session_destroy(session); |
8020ceb5 | 1265 | } |
457a6b58 MD |
1266 | |
1267 | /* WILDCARDS */ | |
1268 | ||
1269 | static | |
1270 | int wildcard_same_loglevel(struct wildcard_entry *e, | |
1271 | enum lttng_ust_loglevel_type loglevel_type, | |
1272 | int loglevel) | |
1273 | { | |
1274 | if (e->loglevel_type == loglevel_type && e->loglevel == loglevel) | |
1275 | return 1; | |
1276 | else | |
1277 | return 0; | |
1278 | } | |
1279 | ||
1280 | #if 0 | |
1281 | static | |
1282 | int wildcard_is_within(struct wildcard_entry *e, | |
1283 | enum lttng_ust_loglevel_type loglevel_type, | |
1284 | int loglevel) | |
1285 | { | |
1286 | if (e->loglevel_type == LTTNG_UST_LOGLEVEL_ALL | |
1287 | || e->loglevel == -1) | |
1288 | return 1; | |
1289 | switch (e->loglevel_type) { | |
1290 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1291 | switch (loglevel_type) { | |
1292 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1293 | if (e->loglevel >= loglevel) | |
1294 | return 1; | |
1295 | else | |
1296 | return 0; | |
1297 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1298 | if (e->loglevel <= 0 && loglevel == 0) | |
1299 | return 1; | |
1300 | else | |
1301 | return 0; | |
1302 | } | |
1303 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1304 | switch (loglevel_type) { | |
1305 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1306 | if (loglevel <= 0) | |
1307 | return 1; | |
1308 | else | |
1309 | return 0; | |
1310 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1311 | if (e->loglevel == loglevel) | |
1312 | return 1; | |
1313 | else | |
1314 | return 0; | |
1315 | } | |
1316 | } | |
1317 | } | |
1318 | #endif | |
1319 | ||
1320 | /* | |
1321 | * Add the wildcard to the wildcard list. Must be called with | |
1322 | * ust lock held. | |
1323 | */ | |
1324 | static | |
1325 | struct session_wildcard *add_wildcard(struct ltt_channel *chan, | |
1326 | struct lttng_ust_event *event_param) | |
1327 | { | |
1328 | struct wildcard_entry *e; | |
1329 | struct session_wildcard *sw; | |
1330 | size_t name_len = strlen(event_param->name) + 1; | |
1331 | int found = 0; | |
1332 | ||
1333 | /* | |
1334 | * Try to find global wildcard entry. Given that this is shared | |
1335 | * across all sessions, we need to check for exact loglevel | |
1336 | * match, not just whether contained within the existing ones. | |
1337 | */ | |
1338 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
1339 | if (!strncmp(event_param->name, e->name, | |
1340 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
1341 | if (wildcard_same_loglevel(e, | |
1342 | event_param->loglevel_type, | |
1343 | event_param->loglevel)) { | |
1344 | found = 1; | |
1345 | break; | |
1346 | } | |
1347 | } | |
1348 | } | |
1349 | ||
1350 | if (!found) { | |
1351 | /* | |
1352 | * Create global wildcard entry if not found. Using | |
1353 | * zmalloc here to allocate a variable length element. | |
1354 | * Could cause some memory fragmentation if overused. | |
1355 | */ | |
1356 | e = zmalloc(sizeof(struct wildcard_entry) + name_len); | |
1357 | if (!e) | |
1358 | return ERR_PTR(-ENOMEM); | |
1359 | memcpy(&e->name[0], event_param->name, name_len); | |
aa141955 MD |
1360 | e->loglevel_type = event_param->loglevel_type; |
1361 | e->loglevel = event_param->loglevel; | |
457a6b58 MD |
1362 | cds_list_add(&e->list, &wildcard_list); |
1363 | CDS_INIT_LIST_HEAD(&e->session_list); | |
1364 | } | |
1365 | ||
1366 | /* session wildcard */ | |
1367 | cds_list_for_each_entry(sw, &e->session_list, session_list) { | |
1368 | if (chan == sw->chan) { | |
1369 | DBG("wildcard %s busy for this channel", | |
1370 | event_param->name); | |
1371 | return ERR_PTR(-EEXIST); /* Already there */ | |
1372 | } | |
1373 | } | |
1374 | sw = zmalloc(sizeof(struct session_wildcard)); | |
1375 | if (!sw) | |
1376 | return ERR_PTR(-ENOMEM); | |
1377 | sw->chan = chan; | |
1378 | sw->enabled = 1; | |
1379 | memcpy(&sw->event_param, event_param, sizeof(sw->event_param)); | |
1380 | sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT; | |
1381 | sw->event_param.loglevel_type = event_param->loglevel_type; | |
1382 | sw->event_param.loglevel = event_param->loglevel; | |
1383 | CDS_INIT_LIST_HEAD(&sw->events); | |
1384 | cds_list_add(&sw->list, &chan->session->wildcards); | |
1385 | cds_list_add(&sw->session_list, &e->session_list); | |
1386 | sw->entry = e; | |
1387 | ltt_probes_create_wildcard_events(e, sw); | |
1388 | return sw; | |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * Remove the wildcard from the wildcard list. Must be called with | |
1393 | * ust_lock held. Only called at session teardown. | |
1394 | */ | |
1395 | static | |
1396 | void _remove_wildcard(struct session_wildcard *wildcard) | |
1397 | { | |
1398 | struct ltt_event *ev, *tmp; | |
1399 | ||
1400 | /* | |
1401 | * Just remove the events owned (for enable/disable) by this | |
1402 | * wildcard from the list. The session teardown will take care | |
1403 | * of freeing the event memory. | |
1404 | */ | |
1405 | cds_list_for_each_entry_safe(ev, tmp, &wildcard->events, | |
1406 | wildcard_list) { | |
1407 | cds_list_del(&ev->wildcard_list); | |
1408 | } | |
1409 | cds_list_del(&wildcard->session_list); | |
1410 | cds_list_del(&wildcard->list); | |
1411 | if (cds_list_empty(&wildcard->entry->session_list)) { | |
1412 | cds_list_del(&wildcard->entry->list); | |
1413 | free(wildcard->entry); | |
1414 | } | |
1415 | free(wildcard); | |
1416 | } | |
1417 | ||
1418 | int ltt_wildcard_create(struct ltt_channel *chan, | |
1419 | struct lttng_ust_event *event_param, | |
1420 | struct session_wildcard **_sw) | |
1421 | { | |
1422 | struct session_wildcard *sw; | |
1423 | ||
1424 | sw = add_wildcard(chan, event_param); | |
1425 | if (!sw || IS_ERR(sw)) { | |
1426 | return PTR_ERR(sw); | |
1427 | } | |
1428 | *_sw = sw; | |
1429 | return 0; | |
1430 | } | |
1431 | ||
1432 | static | |
1433 | void _ltt_wildcard_destroy(struct session_wildcard *sw) | |
1434 | { | |
1435 | _remove_wildcard(sw); | |
1436 | } | |
1437 | ||
1438 | int ltt_wildcard_enable(struct session_wildcard *wildcard) | |
1439 | { | |
1440 | struct ltt_event *ev; | |
1441 | int ret; | |
1442 | ||
1443 | if (wildcard->enabled) | |
1444 | return -EEXIST; | |
1445 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1446 | ret = ltt_event_enable(ev); | |
1447 | if (ret) { | |
1448 | DBG("Error: enable error.\n"); | |
1449 | return ret; | |
1450 | } | |
1451 | } | |
1452 | wildcard->enabled = 1; | |
1453 | return 0; | |
1454 | } | |
1455 | ||
1456 | int ltt_wildcard_disable(struct session_wildcard *wildcard) | |
1457 | { | |
1458 | struct ltt_event *ev; | |
1459 | int ret; | |
1460 | ||
1461 | if (!wildcard->enabled) | |
1462 | return -EEXIST; | |
1463 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1464 | ret = ltt_event_disable(ev); | |
1465 | if (ret) { | |
1466 | DBG("Error: disable error.\n"); | |
1467 | return ret; | |
1468 | } | |
1469 | } | |
1470 | wildcard->enabled = 0; | |
1471 | return 0; | |
1472 | } | |
eddd8d5d MD |
1473 | |
1474 | /* | |
1475 | * Take the TLS "fault" in libuuid if dlopen'd, which can take the | |
1476 | * dynamic linker mutex, outside of the UST lock, since the UST lock is | |
1477 | * taken in constructors, which are called with dynamic linker mutex | |
1478 | * held. | |
1479 | */ | |
1480 | void lttng_fixup_event_tls(void) | |
1481 | { | |
1482 | unsigned char uuid[37]; | |
1483 | ||
1484 | (void) uuid_generate(uuid); | |
1485 | } |