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> |
578ce73a | 28 | #include <uuid/uuid.h> |
b5234c06 | 29 | #include <errno.h> |
f4681817 MD |
30 | #include <sys/shm.h> |
31 | #include <sys/ipc.h> | |
44c72f10 MD |
32 | #include <stdint.h> |
33 | #include <stddef.h> | |
28b12049 MD |
34 | #include <inttypes.h> |
35 | #include <time.h> | |
9e3c23dc | 36 | #include <lttng/ust-endian.h> |
28b12049 | 37 | #include "clock.h" |
44c72f10 MD |
38 | |
39 | #include <urcu-bp.h> | |
40 | #include <urcu/compiler.h> | |
41 | #include <urcu/uatomic.h> | |
42 | #include <urcu/arch.h> | |
43 | ||
44 | #include <lttng/tracepoint.h> | |
4318ae1b | 45 | #include <lttng/ust-events.h> |
44c72f10 MD |
46 | |
47 | #include <usterr-signal-safe.h> | |
48 | #include <helper.h> | |
1f18504e | 49 | #include "error.h" |
69df1193 | 50 | #include "compat.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)); | |
7a673d99 | 249 | strncpy(event_param.name, |
e6c12e3d MD |
250 | desc->name, |
251 | sizeof(event_param.name)); | |
7a673d99 | 252 | event_param.name[sizeof(event_param.name) - 1] = '\0'; |
e6c12e3d MD |
253 | /* create event */ |
254 | ret = ltt_event_create(sw->chan, | |
255 | &event_param, NULL, | |
256 | &ev); | |
257 | if (ret) { | |
258 | DBG("Error creating event"); | |
259 | continue; | |
260 | } | |
261 | cds_list_add(&ev->wildcard_list, | |
262 | &sw->events); | |
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); | |
299 | } | |
300 | return ret; | |
301 | } | |
302 | ||
8020ceb5 MD |
303 | void synchronize_trace(void) |
304 | { | |
8020ceb5 | 305 | synchronize_rcu(); |
8020ceb5 MD |
306 | } |
307 | ||
308 | struct ltt_session *ltt_session_create(void) | |
309 | { | |
310 | struct ltt_session *session; | |
311 | ||
b5234c06 | 312 | session = zmalloc(sizeof(struct ltt_session)); |
8020ceb5 MD |
313 | if (!session) |
314 | return NULL; | |
b5234c06 MD |
315 | CDS_INIT_LIST_HEAD(&session->chan); |
316 | CDS_INIT_LIST_HEAD(&session->events); | |
e6c12e3d | 317 | CDS_INIT_LIST_HEAD(&session->wildcards); |
578ce73a | 318 | uuid_generate(session->uuid); |
b5234c06 | 319 | cds_list_add(&session->list, &sessions); |
8020ceb5 MD |
320 | return session; |
321 | } | |
322 | ||
323 | void ltt_session_destroy(struct ltt_session *session) | |
324 | { | |
325 | struct ltt_channel *chan, *tmpchan; | |
326 | struct ltt_event *event, *tmpevent; | |
e6c12e3d | 327 | struct session_wildcard *wildcard, *tmpwildcard; |
8020ceb5 MD |
328 | int ret; |
329 | ||
b5234c06 MD |
330 | CMM_ACCESS_ONCE(session->active) = 0; |
331 | cds_list_for_each_entry(event, &session->events, list) { | |
8020ceb5 MD |
332 | ret = _ltt_event_unregister(event); |
333 | WARN_ON(ret); | |
334 | } | |
335 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e6c12e3d MD |
336 | cds_list_for_each_entry_safe(wildcard, tmpwildcard, &session->wildcards, list) |
337 | _ltt_wildcard_destroy(wildcard); | |
b5234c06 | 338 | cds_list_for_each_entry_safe(event, tmpevent, &session->events, list) |
8020ceb5 | 339 | _ltt_event_destroy(event); |
b5234c06 | 340 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list) |
8020ceb5 | 341 | _ltt_channel_destroy(chan); |
b5234c06 | 342 | cds_list_del(&session->list); |
b5234c06 | 343 | free(session); |
8020ceb5 MD |
344 | } |
345 | ||
976fe9ea | 346 | int ltt_session_enable(struct ltt_session *session) |
8020ceb5 MD |
347 | { |
348 | int ret = 0; | |
349 | struct ltt_channel *chan; | |
350 | ||
8020ceb5 MD |
351 | if (session->active) { |
352 | ret = -EBUSY; | |
353 | goto end; | |
354 | } | |
355 | ||
356 | /* | |
357 | * Snapshot the number of events per channel to know the type of header | |
358 | * we need to use. | |
359 | */ | |
b5234c06 | 360 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
361 | if (chan->header_type) |
362 | continue; /* don't change it if session stop/restart */ | |
363 | if (chan->free_event_id < 31) | |
364 | chan->header_type = 1; /* compact */ | |
365 | else | |
366 | chan->header_type = 2; /* large */ | |
367 | } | |
368 | ||
b5234c06 MD |
369 | CMM_ACCESS_ONCE(session->active) = 1; |
370 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
8020ceb5 | 371 | ret = _ltt_session_metadata_statedump(session); |
4b4de73e | 372 | if (ret) |
b5234c06 | 373 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 374 | end: |
8020ceb5 MD |
375 | return ret; |
376 | } | |
377 | ||
976fe9ea | 378 | int ltt_session_disable(struct ltt_session *session) |
8020ceb5 MD |
379 | { |
380 | int ret = 0; | |
381 | ||
8020ceb5 MD |
382 | if (!session->active) { |
383 | ret = -EBUSY; | |
384 | goto end; | |
385 | } | |
b5234c06 | 386 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 387 | end: |
8020ceb5 MD |
388 | return ret; |
389 | } | |
390 | ||
976fe9ea MD |
391 | int ltt_channel_enable(struct ltt_channel *channel) |
392 | { | |
393 | int old; | |
394 | ||
9beb36ba MD |
395 | if (channel == channel->session->metadata) |
396 | return -EPERM; | |
b5234c06 | 397 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
398 | if (old) |
399 | return -EEXIST; | |
400 | return 0; | |
401 | } | |
402 | ||
403 | int ltt_channel_disable(struct ltt_channel *channel) | |
404 | { | |
405 | int old; | |
406 | ||
9beb36ba MD |
407 | if (channel == channel->session->metadata) |
408 | return -EPERM; | |
b5234c06 | 409 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
410 | if (!old) |
411 | return -EEXIST; | |
412 | return 0; | |
413 | } | |
414 | ||
415 | int ltt_event_enable(struct ltt_event *event) | |
416 | { | |
417 | int old; | |
418 | ||
9beb36ba MD |
419 | if (event->chan == event->chan->session->metadata) |
420 | return -EPERM; | |
b5234c06 | 421 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
422 | if (old) |
423 | return -EEXIST; | |
424 | return 0; | |
425 | } | |
426 | ||
427 | int ltt_event_disable(struct ltt_event *event) | |
428 | { | |
429 | int old; | |
430 | ||
9beb36ba MD |
431 | if (event->chan == event->chan->session->metadata) |
432 | return -EPERM; | |
b5234c06 | 433 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
434 | if (!old) |
435 | return -EEXIST; | |
436 | return 0; | |
437 | } | |
438 | ||
8020ceb5 MD |
439 | struct ltt_channel *ltt_channel_create(struct ltt_session *session, |
440 | const char *transport_name, | |
441 | void *buf_addr, | |
442 | size_t subbuf_size, size_t num_subbuf, | |
443 | unsigned int switch_timer_interval, | |
193183fb | 444 | unsigned int read_timer_interval, |
ef9ff354 MD |
445 | int **shm_fd, int **wait_fd, |
446 | uint64_t **memory_map_size, | |
d028eddb | 447 | struct ltt_channel *chan_priv_init) |
8020ceb5 | 448 | { |
a3f61e7f | 449 | struct ltt_channel *chan = NULL; |
8020ceb5 MD |
450 | struct ltt_transport *transport; |
451 | ||
8020ceb5 MD |
452 | if (session->been_active) |
453 | goto active; /* Refuse to add channel to active session */ | |
454 | transport = ltt_transport_find(transport_name); | |
455 | if (!transport) { | |
b5234c06 | 456 | DBG("LTTng transport %s not found\n", |
8020ceb5 MD |
457 | transport_name); |
458 | goto notransport; | |
459 | } | |
d028eddb MD |
460 | chan_priv_init->id = session->free_chan_id++; |
461 | chan_priv_init->session = session; | |
8020ceb5 MD |
462 | /* |
463 | * Note: the channel creation op already writes into the packet | |
464 | * headers. Therefore the "chan" information used as input | |
465 | * should be already accessible. | |
466 | */ | |
e7372d13 | 467 | chan = transport->ops.channel_create(transport_name, buf_addr, |
8020ceb5 | 468 | subbuf_size, num_subbuf, switch_timer_interval, |
193183fb | 469 | read_timer_interval, shm_fd, wait_fd, |
d028eddb | 470 | memory_map_size, chan_priv_init); |
a3f61e7f | 471 | if (!chan) |
8020ceb5 | 472 | goto create_error; |
976fe9ea | 473 | chan->enabled = 1; |
8020ceb5 | 474 | chan->ops = &transport->ops; |
b5234c06 | 475 | cds_list_add(&chan->list, &session->chan); |
8020ceb5 MD |
476 | return chan; |
477 | ||
478 | create_error: | |
8020ceb5 MD |
479 | notransport: |
480 | active: | |
8020ceb5 MD |
481 | return NULL; |
482 | } | |
483 | ||
484 | /* | |
485 | * Only used internally at session destruction. | |
486 | */ | |
487 | static | |
488 | void _ltt_channel_destroy(struct ltt_channel *chan) | |
489 | { | |
b5234c06 | 490 | cds_list_del(&chan->list); |
8020ceb5 | 491 | lttng_destroy_context(chan->ctx); |
a3f61e7f | 492 | chan->ops->channel_destroy(chan); |
8020ceb5 MD |
493 | } |
494 | ||
495 | /* | |
496 | * Supports event creation while tracing session is active. | |
497 | */ | |
576599a0 MD |
498 | int ltt_event_create(struct ltt_channel *chan, |
499 | struct lttng_ust_event *event_param, | |
0264ec6c | 500 | void (*filter)(struct ltt_event *event), |
576599a0 | 501 | struct ltt_event **_event) |
8020ceb5 | 502 | { |
457a6b58 | 503 | const struct lttng_event_desc *desc = NULL; /* silence gcc */ |
8020ceb5 | 504 | struct ltt_event *event; |
576599a0 | 505 | int ret = 0; |
8020ceb5 | 506 | |
38eb0baa | 507 | if (chan->used_event_id == -1U) { |
576599a0 | 508 | ret = -ENOMEM; |
8020ceb5 | 509 | goto full; |
576599a0 | 510 | } |
8020ceb5 MD |
511 | /* |
512 | * This is O(n^2) (for each event, the loop is called at event | |
513 | * creation). Might require a hash if we have lots of events. | |
514 | */ | |
576599a0 | 515 | cds_list_for_each_entry(event, &chan->session->events, list) { |
ff412fb5 MD |
516 | if (event->desc && !strncmp(event->desc->name, |
517 | event_param->name, | |
518 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
576599a0 | 519 | ret = -EEXIST; |
8020ceb5 | 520 | goto exist; |
576599a0 MD |
521 | } |
522 | } | |
457a6b58 MD |
523 | |
524 | /* | |
525 | * Check if loglevel match. Refuse to connect event if not. | |
526 | */ | |
527 | if (event_param->instrumentation == LTTNG_UST_TRACEPOINT) { | |
528 | desc = ltt_event_get(event_param->name); | |
fe2d02f4 MD |
529 | if (desc) { |
530 | if (!ltt_loglevel_match(desc, | |
531 | event_param->loglevel_type, | |
532 | event_param->loglevel)) { | |
533 | ret = -EPERM; | |
534 | goto no_loglevel_match; | |
535 | } | |
457a6b58 | 536 | } |
fe2d02f4 MD |
537 | /* |
538 | * If descriptor is not there, it will be added to | |
539 | * pending probes. | |
540 | */ | |
457a6b58 | 541 | } |
b5234c06 | 542 | event = zmalloc(sizeof(struct ltt_event)); |
576599a0 MD |
543 | if (!event) { |
544 | ret = -ENOMEM; | |
8020ceb5 | 545 | goto cache_error; |
576599a0 | 546 | } |
8020ceb5 MD |
547 | event->chan = chan; |
548 | event->filter = filter; | |
8165c8da MD |
549 | /* |
550 | * used_event_id counts the maximum number of event IDs that can | |
551 | * register if all probes register. | |
552 | */ | |
553 | chan->used_event_id++; | |
976fe9ea | 554 | event->enabled = 1; |
8020ceb5 MD |
555 | event->instrumentation = event_param->instrumentation; |
556 | /* Populate ltt_event structure before tracepoint registration. */ | |
b5234c06 | 557 | cmm_smp_wmb(); |
8020ceb5 | 558 | switch (event_param->instrumentation) { |
b5234c06 | 559 | case LTTNG_UST_TRACEPOINT: |
457a6b58 | 560 | event->desc = desc; |
8165c8da MD |
561 | if (event->desc) { |
562 | ret = __tracepoint_probe_register(event_param->name, | |
563 | event->desc->probe_callback, | |
67e5f391 | 564 | event, event->desc->signature); |
8165c8da MD |
565 | if (ret) |
566 | goto register_error; | |
567 | event->id = chan->free_event_id++; | |
568 | } else { | |
569 | /* | |
570 | * If the probe is not present, event->desc stays NULL, | |
571 | * waiting for the probe to register, and the event->id | |
572 | * stays unallocated. | |
573 | */ | |
457a6b58 MD |
574 | ret = add_pending_probe(event, event_param->name, |
575 | event_param->loglevel_type, | |
576 | event_param->loglevel); | |
8165c8da MD |
577 | if (ret) |
578 | goto add_pending_error; | |
579 | } | |
8020ceb5 | 580 | break; |
8020ceb5 MD |
581 | default: |
582 | WARN_ON_ONCE(1); | |
583 | } | |
8165c8da MD |
584 | if (event->desc) { |
585 | ret = _ltt_event_metadata_statedump(chan->session, chan, event); | |
586 | if (ret) | |
587 | goto statedump_error; | |
588 | } | |
b5234c06 | 589 | cds_list_add(&event->list, &chan->session->events); |
576599a0 MD |
590 | *_event = event; |
591 | return 0; | |
8020ceb5 MD |
592 | |
593 | statedump_error: | |
8165c8da MD |
594 | if (event->desc) { |
595 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_param->name, | |
596 | event->desc->probe_callback, | |
597 | event)); | |
598 | ltt_event_put(event->desc); | |
599 | } | |
600 | add_pending_error: | |
8020ceb5 | 601 | register_error: |
b5234c06 | 602 | free(event); |
8020ceb5 | 603 | cache_error: |
457a6b58 | 604 | no_loglevel_match: |
8020ceb5 MD |
605 | exist: |
606 | full: | |
576599a0 | 607 | return ret; |
8020ceb5 MD |
608 | } |
609 | ||
610 | /* | |
611 | * Only used internally at session destruction. | |
612 | */ | |
613 | int _ltt_event_unregister(struct ltt_event *event) | |
614 | { | |
615 | int ret = -EINVAL; | |
616 | ||
617 | switch (event->instrumentation) { | |
b5234c06 | 618 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
619 | if (event->desc) { |
620 | ret = __tracepoint_probe_unregister(event->desc->name, | |
621 | event->desc->probe_callback, | |
622 | event); | |
623 | if (ret) | |
624 | return ret; | |
625 | } else { | |
626 | remove_pending_probe(event->pending_probe); | |
627 | ret = 0; | |
628 | } | |
8020ceb5 | 629 | break; |
8020ceb5 MD |
630 | default: |
631 | WARN_ON_ONCE(1); | |
632 | } | |
633 | return ret; | |
634 | } | |
635 | ||
636 | /* | |
637 | * Only used internally at session destruction. | |
638 | */ | |
639 | static | |
640 | void _ltt_event_destroy(struct ltt_event *event) | |
641 | { | |
642 | switch (event->instrumentation) { | |
b5234c06 | 643 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
644 | if (event->desc) { |
645 | ltt_event_put(event->desc); | |
646 | } | |
8020ceb5 | 647 | break; |
8020ceb5 MD |
648 | default: |
649 | WARN_ON_ONCE(1); | |
650 | } | |
b5234c06 | 651 | cds_list_del(&event->list); |
8020ceb5 | 652 | lttng_destroy_context(event->ctx); |
b5234c06 | 653 | free(event); |
8020ceb5 MD |
654 | } |
655 | ||
656 | /* | |
657 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 658 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
659 | * remaining space left in packet and write, since mutual exclusion |
660 | * protects us from concurrent writes. | |
661 | */ | |
662 | int lttng_metadata_printf(struct ltt_session *session, | |
663 | const char *fmt, ...) | |
664 | { | |
4cfec15c | 665 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
8020ceb5 | 666 | struct ltt_channel *chan = session->metadata; |
b5234c06 | 667 | char *str = NULL; |
8020ceb5 MD |
668 | int ret = 0, waitret; |
669 | size_t len, reserve_len, pos; | |
670 | va_list ap; | |
671 | ||
b5234c06 | 672 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
673 | |
674 | va_start(ap, fmt); | |
b5234c06 | 675 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 676 | va_end(ap); |
b5234c06 | 677 | if (ret < 0) |
8020ceb5 MD |
678 | return -ENOMEM; |
679 | ||
680 | len = strlen(str); | |
681 | pos = 0; | |
682 | ||
683 | for (pos = 0; pos < len; pos += reserve_len) { | |
684 | reserve_len = min_t(size_t, | |
1d498196 | 685 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
686 | len - pos); |
687 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 688 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
689 | /* |
690 | * We don't care about metadata buffer's records lost | |
691 | * count, because we always retry here. Report error if | |
692 | * we need to bail out after timeout or being | |
693 | * interrupted. | |
694 | */ | |
b5234c06 | 695 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
696 | ({ |
697 | ret = chan->ops->event_reserve(&ctx, 0); | |
698 | ret != -ENOBUFS || !ret; | |
699 | }), | |
b5234c06 | 700 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 701 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
702 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
703 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 704 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 705 | if (waitret == -EINTR) |
8020ceb5 MD |
706 | ret = waitret; |
707 | goto end; | |
708 | } | |
709 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
710 | chan->ops->event_commit(&ctx); | |
711 | } | |
712 | end: | |
b5234c06 | 713 | free(str); |
8020ceb5 MD |
714 | return ret; |
715 | } | |
716 | ||
717 | static | |
718 | int _ltt_field_statedump(struct ltt_session *session, | |
719 | const struct lttng_event_field *field) | |
720 | { | |
721 | int ret = 0; | |
722 | ||
723 | switch (field->type.atype) { | |
724 | case atype_integer: | |
725 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 726 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
727 | field->type.u.basic.integer.size, |
728 | field->type.u.basic.integer.alignment, | |
729 | field->type.u.basic.integer.signedness, | |
730 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
731 | ? "none" | |
732 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
733 | ? "UTF8" | |
734 | : "ASCII", | |
735 | field->type.u.basic.integer.base, | |
8a98a75d | 736 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
737 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
738 | #else | |
739 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
740 | #endif | |
741 | field->name); | |
742 | break; | |
743 | case atype_float: | |
744 | ret = lttng_metadata_printf(session, | |
8a98a75d | 745 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
746 | field->type.u.basic._float.exp_dig, |
747 | field->type.u.basic._float.mant_dig, | |
748 | field->type.u.basic._float.alignment, | |
8a98a75d | 749 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
750 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
751 | #else | |
752 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
753 | #endif | |
754 | field->name); | |
755 | break; | |
756 | case atype_enum: | |
757 | ret = lttng_metadata_printf(session, | |
758 | " %s %s;\n", | |
759 | field->type.u.basic.enumeration.name, | |
760 | field->name); | |
761 | break; | |
762 | case atype_array: | |
763 | { | |
764 | const struct lttng_basic_type *elem_type; | |
765 | ||
766 | elem_type = &field->type.u.array.elem_type; | |
767 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 768 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
769 | elem_type->u.basic.integer.size, |
770 | elem_type->u.basic.integer.alignment, | |
771 | elem_type->u.basic.integer.signedness, | |
772 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
773 | ? "none" | |
774 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
775 | ? "UTF8" | |
776 | : "ASCII", | |
777 | elem_type->u.basic.integer.base, | |
8a98a75d | 778 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
779 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
780 | #else | |
781 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
782 | #endif | |
783 | field->name, field->type.u.array.length); | |
784 | break; | |
785 | } | |
786 | case atype_sequence: | |
787 | { | |
788 | const struct lttng_basic_type *elem_type; | |
789 | const struct lttng_basic_type *length_type; | |
790 | ||
791 | elem_type = &field->type.u.sequence.elem_type; | |
792 | length_type = &field->type.u.sequence.length_type; | |
793 | ret = lttng_metadata_printf(session, | |
794 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
795 | length_type->u.basic.integer.size, | |
796 | (unsigned int) length_type->u.basic.integer.alignment, | |
797 | length_type->u.basic.integer.signedness, | |
798 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
799 | ? "none" | |
800 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
801 | ? "UTF8" | |
802 | : "ASCII"), | |
803 | length_type->u.basic.integer.base, | |
8a98a75d | 804 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
805 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
806 | #else | |
807 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
808 | #endif | |
809 | field->name); | |
810 | if (ret) | |
811 | return ret; | |
812 | ||
813 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 814 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
815 | elem_type->u.basic.integer.size, |
816 | (unsigned int) elem_type->u.basic.integer.alignment, | |
817 | elem_type->u.basic.integer.signedness, | |
818 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
819 | ? "none" | |
820 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
821 | ? "UTF8" | |
822 | : "ASCII"), | |
823 | elem_type->u.basic.integer.base, | |
8a98a75d | 824 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
825 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
826 | #else | |
827 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
828 | #endif | |
829 | field->name, | |
830 | field->name); | |
831 | break; | |
832 | } | |
833 | ||
834 | case atype_string: | |
835 | /* Default encoding is UTF8 */ | |
836 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 837 | " string%s _%s;\n", |
8020ceb5 MD |
838 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
839 | " { encoding = ASCII; }" : "", | |
840 | field->name); | |
841 | break; | |
842 | default: | |
843 | WARN_ON_ONCE(1); | |
844 | return -EINVAL; | |
845 | } | |
846 | return ret; | |
847 | } | |
848 | ||
849 | static | |
850 | int _ltt_context_metadata_statedump(struct ltt_session *session, | |
851 | struct lttng_ctx *ctx) | |
852 | { | |
853 | int ret = 0; | |
854 | int i; | |
855 | ||
856 | if (!ctx) | |
857 | return 0; | |
858 | for (i = 0; i < ctx->nr_fields; i++) { | |
859 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
860 | ||
861 | ret = _ltt_field_statedump(session, &field->event_field); | |
862 | if (ret) | |
863 | return ret; | |
864 | } | |
865 | return ret; | |
866 | } | |
867 | ||
868 | static | |
869 | int _ltt_fields_metadata_statedump(struct ltt_session *session, | |
870 | struct ltt_event *event) | |
871 | { | |
872 | const struct lttng_event_desc *desc = event->desc; | |
873 | int ret = 0; | |
874 | int i; | |
875 | ||
876 | for (i = 0; i < desc->nr_fields; i++) { | |
877 | const struct lttng_event_field *field = &desc->fields[i]; | |
878 | ||
879 | ret = _ltt_field_statedump(session, field); | |
880 | if (ret) | |
881 | return ret; | |
882 | } | |
883 | return ret; | |
884 | } | |
885 | ||
886 | static | |
887 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
888 | struct ltt_channel *chan, | |
889 | struct ltt_event *event) | |
890 | { | |
891 | int ret = 0; | |
8155c5e8 | 892 | int loglevel = TRACE_DEFAULT; |
8020ceb5 | 893 | |
b5234c06 | 894 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
895 | return 0; |
896 | if (chan == session->metadata) | |
897 | return 0; | |
8165c8da MD |
898 | /* |
899 | * Don't print events for which probe load is pending. | |
900 | */ | |
901 | if (!event->desc) | |
902 | return 0; | |
8020ceb5 MD |
903 | |
904 | ret = lttng_metadata_printf(session, | |
905 | "event {\n" | |
7083f0fe | 906 | " name = \"%s\";\n" |
8020ceb5 MD |
907 | " id = %u;\n" |
908 | " stream_id = %u;\n", | |
909 | event->desc->name, | |
910 | event->id, | |
911 | event->chan->id); | |
912 | if (ret) | |
913 | goto end; | |
914 | ||
8155c5e8 MD |
915 | if (event->desc->loglevel) |
916 | loglevel = *(*event->desc->loglevel); | |
917 | ||
918 | ret = lttng_metadata_printf(session, | |
919 | " loglevel = %d;\n", | |
920 | loglevel); | |
921 | if (ret) | |
922 | goto end; | |
e6c12e3d | 923 | |
8020ceb5 MD |
924 | if (event->ctx) { |
925 | ret = lttng_metadata_printf(session, | |
926 | " context := struct {\n"); | |
927 | if (ret) | |
928 | goto end; | |
929 | } | |
930 | ret = _ltt_context_metadata_statedump(session, event->ctx); | |
931 | if (ret) | |
932 | goto end; | |
933 | if (event->ctx) { | |
934 | ret = lttng_metadata_printf(session, | |
935 | " };\n"); | |
936 | if (ret) | |
937 | goto end; | |
938 | } | |
939 | ||
940 | ret = lttng_metadata_printf(session, | |
941 | " fields := struct {\n" | |
942 | ); | |
943 | if (ret) | |
944 | goto end; | |
945 | ||
946 | ret = _ltt_fields_metadata_statedump(session, event); | |
947 | if (ret) | |
948 | goto end; | |
949 | ||
950 | /* | |
951 | * LTTng space reservation can only reserve multiples of the | |
952 | * byte size. | |
953 | */ | |
954 | ret = lttng_metadata_printf(session, | |
955 | " };\n" | |
956 | "};\n\n"); | |
957 | if (ret) | |
958 | goto end; | |
959 | ||
960 | event->metadata_dumped = 1; | |
961 | end: | |
962 | return ret; | |
963 | ||
964 | } | |
965 | ||
966 | static | |
967 | int _ltt_channel_metadata_statedump(struct ltt_session *session, | |
968 | struct ltt_channel *chan) | |
969 | { | |
970 | int ret = 0; | |
971 | ||
b5234c06 | 972 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
973 | return 0; |
974 | if (chan == session->metadata) | |
975 | return 0; | |
976 | ||
977 | WARN_ON_ONCE(!chan->header_type); | |
978 | ret = lttng_metadata_printf(session, | |
979 | "stream {\n" | |
980 | " id = %u;\n" | |
981 | " event.header := %s;\n" | |
982 | " packet.context := struct packet_context;\n", | |
983 | chan->id, | |
984 | chan->header_type == 1 ? "struct event_header_compact" : | |
985 | "struct event_header_large"); | |
986 | if (ret) | |
987 | goto end; | |
988 | ||
989 | if (chan->ctx) { | |
990 | ret = lttng_metadata_printf(session, | |
991 | " event.context := struct {\n"); | |
992 | if (ret) | |
993 | goto end; | |
994 | } | |
995 | ret = _ltt_context_metadata_statedump(session, chan->ctx); | |
996 | if (ret) | |
997 | goto end; | |
998 | if (chan->ctx) { | |
999 | ret = lttng_metadata_printf(session, | |
1000 | " };\n"); | |
1001 | if (ret) | |
1002 | goto end; | |
1003 | } | |
1004 | ||
1005 | ret = lttng_metadata_printf(session, | |
1006 | "};\n\n"); | |
1007 | ||
1008 | chan->metadata_dumped = 1; | |
1009 | end: | |
1010 | return ret; | |
1011 | } | |
1012 | ||
1013 | static | |
1014 | int _ltt_stream_packet_context_declare(struct ltt_session *session) | |
1015 | { | |
1016 | return lttng_metadata_printf(session, | |
1017 | "struct packet_context {\n" | |
28b12049 MD |
1018 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1019 | " uint64_clock_monotonic_t timestamp_end;\n" | |
8020ceb5 MD |
1020 | " uint32_t events_discarded;\n" |
1021 | " uint32_t content_size;\n" | |
1022 | " uint32_t packet_size;\n" | |
1023 | " uint32_t cpu_id;\n" | |
1024 | "};\n\n" | |
1025 | ); | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * Compact header: | |
1030 | * id: range: 0 - 30. | |
1031 | * id 31 is reserved to indicate an extended header. | |
1032 | * | |
1033 | * Large header: | |
1034 | * id: range: 0 - 65534. | |
1035 | * id 65535 is reserved to indicate an extended header. | |
1036 | */ | |
1037 | static | |
1038 | int _ltt_event_header_declare(struct ltt_session *session) | |
1039 | { | |
1040 | return lttng_metadata_printf(session, | |
1041 | "struct event_header_compact {\n" | |
1042 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1043 | " variant <id> {\n" | |
1044 | " struct {\n" | |
28b12049 | 1045 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1046 | " } compact;\n" |
1047 | " struct {\n" | |
1048 | " uint32_t id;\n" | |
28b12049 | 1049 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1050 | " } extended;\n" |
1051 | " } v;\n" | |
1052 | "} align(%u);\n" | |
1053 | "\n" | |
1054 | "struct event_header_large {\n" | |
1055 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1056 | " variant <id> {\n" | |
1057 | " struct {\n" | |
28b12049 | 1058 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1059 | " } compact;\n" |
1060 | " struct {\n" | |
1061 | " uint32_t id;\n" | |
28b12049 | 1062 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1063 | " } extended;\n" |
1064 | " } v;\n" | |
1065 | "} align(%u);\n\n", | |
1dbfff0c MD |
1066 | lttng_alignof(uint32_t) * CHAR_BIT, |
1067 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1068 | ); |
1069 | } | |
1070 | ||
28b12049 MD |
1071 | /* |
1072 | * Approximation of NTP time of day to clock monotonic correlation, | |
1073 | * taken at start of trace. | |
1074 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1075 | * in future versions. | |
1076 | */ | |
1077 | static | |
1078 | uint64_t measure_clock_offset(void) | |
1079 | { | |
1080 | uint64_t offset, monotonic[2], realtime; | |
1081 | struct timespec rts = { 0, 0 }; | |
1082 | int ret; | |
1083 | ||
1084 | monotonic[0] = trace_clock_read64(); | |
1085 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1086 | if (ret < 0) | |
1087 | return 0; | |
1088 | monotonic[1] = trace_clock_read64(); | |
1089 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
17ec046a | 1090 | realtime = (uint64_t) rts.tv_sec * 1000000000ULL; |
28b12049 MD |
1091 | realtime += rts.tv_nsec; |
1092 | offset = realtime - offset; | |
1093 | return offset; | |
1094 | } | |
1095 | ||
8020ceb5 MD |
1096 | /* |
1097 | * Output metadata into this session's metadata buffers. | |
1098 | */ | |
1099 | static | |
1100 | int _ltt_session_metadata_statedump(struct ltt_session *session) | |
1101 | { | |
b5234c06 | 1102 | unsigned char *uuid_c = session->uuid; |
578ce73a | 1103 | char uuid_s[37], clock_uuid_s[CLOCK_UUID_LEN]; |
8020ceb5 MD |
1104 | struct ltt_channel *chan; |
1105 | struct ltt_event *event; | |
1106 | int ret = 0; | |
69df1193 | 1107 | char procname[LTTNG_UST_PROCNAME_LEN] = ""; |
8020ceb5 | 1108 | |
b5234c06 | 1109 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1110 | return 0; |
1111 | if (session->metadata_dumped) | |
1112 | goto skip_session; | |
1113 | if (!session->metadata) { | |
b5234c06 | 1114 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1115 | return -EPERM; |
1116 | } | |
1117 | ||
1118 | snprintf(uuid_s, sizeof(uuid_s), | |
1119 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1120 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1121 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1122 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1123 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1124 | ||
1125 | ret = lttng_metadata_printf(session, | |
1126 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1127 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1128 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1129 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
1130 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" | |
1131 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1132 | "\n" | |
1133 | "trace {\n" | |
1134 | " major = %u;\n" | |
1135 | " minor = %u;\n" | |
1136 | " uuid = \"%s\";\n" | |
1137 | " byte_order = %s;\n" | |
1138 | " packet.header := struct {\n" | |
1139 | " uint32_t magic;\n" | |
1140 | " uint8_t uuid[16];\n" | |
1141 | " uint32_t stream_id;\n" | |
1142 | " };\n" | |
1143 | "};\n\n", | |
1dbfff0c MD |
1144 | lttng_alignof(uint8_t) * CHAR_BIT, |
1145 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1146 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1147 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2694975d MD |
1148 | CTF_SPEC_MAJOR, |
1149 | CTF_SPEC_MINOR, | |
8020ceb5 | 1150 | uuid_s, |
8a98a75d | 1151 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1152 | "be" |
1153 | #else | |
1154 | "le" | |
1155 | #endif | |
1156 | ); | |
1157 | if (ret) | |
1158 | goto end; | |
1159 | ||
b020e504 | 1160 | /* ignore error, just use empty string if error. */ |
69df1193 MD |
1161 | lttng_ust_getprocname(procname); |
1162 | procname[LTTNG_UST_PROCNAME_LEN - 1] = '\0'; | |
b020e504 MD |
1163 | ret = lttng_metadata_printf(session, |
1164 | "env {\n" | |
1165 | " vpid = %d;\n" | |
1166 | " procname = \"%s\";\n" | |
2694975d MD |
1167 | " domain = \"ust\";\n" |
1168 | " tracer_name = \"lttng-ust\";\n" | |
1169 | " tracer_major = %u;\n" | |
1170 | " tracer_minor = %u;\n" | |
1171 | " tracer_patchlevel = %u;\n" | |
b020e504 MD |
1172 | "};\n\n", |
1173 | (int) getpid(), | |
1174 | procname, | |
2694975d MD |
1175 | LTTNG_UST_MAJOR_VERSION, |
1176 | LTTNG_UST_MINOR_VERSION, | |
1177 | LTTNG_UST_PATCHLEVEL_VERSION | |
b020e504 MD |
1178 | ); |
1179 | if (ret) | |
1180 | goto end; | |
1181 | ||
28b12049 MD |
1182 | ret = lttng_metadata_printf(session, |
1183 | "clock {\n" | |
939950af MD |
1184 | " name = %s;\n", |
1185 | "monotonic" | |
1186 | ); | |
1187 | if (ret) | |
1188 | goto end; | |
1189 | ||
1190 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1191 | ret = lttng_metadata_printf(session, | |
1192 | " uuid = \"%s\";\n", | |
1193 | clock_uuid_s | |
1194 | ); | |
1195 | if (ret) | |
1196 | goto end; | |
1197 | } | |
1198 | ||
1199 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1200 | " description = \"Monotonic Clock\";\n" |
1201 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1202 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1203 | " offset = %" PRIu64 ";\n" | |
1204 | "};\n\n", | |
28b12049 MD |
1205 | trace_clock_freq(), |
1206 | measure_clock_offset() | |
1207 | ); | |
1208 | if (ret) | |
1209 | goto end; | |
1210 | ||
1211 | ret = lttng_metadata_printf(session, | |
1212 | "typealias integer {\n" | |
1213 | " size = 27; align = 1; signed = false;\n" | |
1214 | " map = clock.monotonic.value;\n" | |
1215 | "} := uint27_clock_monotonic_t;\n" | |
1216 | "\n" | |
1217 | "typealias integer {\n" | |
1218 | " size = 32; align = %u; signed = false;\n" | |
1219 | " map = clock.monotonic.value;\n" | |
1220 | "} := uint32_clock_monotonic_t;\n" | |
1221 | "\n" | |
1222 | "typealias integer {\n" | |
1223 | " size = 64; align = %u; signed = false;\n" | |
1224 | " map = clock.monotonic.value;\n" | |
1225 | "} := uint64_clock_monotonic_t;\n\n", | |
1226 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1227 | lttng_alignof(uint64_t) * CHAR_BIT | |
1228 | ); | |
1229 | if (ret) | |
1230 | goto end; | |
1231 | ||
8020ceb5 MD |
1232 | ret = _ltt_stream_packet_context_declare(session); |
1233 | if (ret) | |
1234 | goto end; | |
1235 | ||
1236 | ret = _ltt_event_header_declare(session); | |
1237 | if (ret) | |
1238 | goto end; | |
1239 | ||
1240 | skip_session: | |
b5234c06 | 1241 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
1242 | ret = _ltt_channel_metadata_statedump(session, chan); |
1243 | if (ret) | |
1244 | goto end; | |
1245 | } | |
1246 | ||
b5234c06 | 1247 | cds_list_for_each_entry(event, &session->events, list) { |
8020ceb5 MD |
1248 | ret = _ltt_event_metadata_statedump(session, event->chan, event); |
1249 | if (ret) | |
1250 | goto end; | |
1251 | } | |
1252 | session->metadata_dumped = 1; | |
1253 | end: | |
1254 | return ret; | |
1255 | } | |
1256 | ||
003fedf4 | 1257 | void lttng_ust_events_exit(void) |
8020ceb5 MD |
1258 | { |
1259 | struct ltt_session *session, *tmpsession; | |
1260 | ||
b5234c06 | 1261 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, list) |
8020ceb5 | 1262 | ltt_session_destroy(session); |
8020ceb5 | 1263 | } |
457a6b58 MD |
1264 | |
1265 | /* WILDCARDS */ | |
1266 | ||
1267 | static | |
1268 | int wildcard_same_loglevel(struct wildcard_entry *e, | |
1269 | enum lttng_ust_loglevel_type loglevel_type, | |
1270 | int loglevel) | |
1271 | { | |
1272 | if (e->loglevel_type == loglevel_type && e->loglevel == loglevel) | |
1273 | return 1; | |
1274 | else | |
1275 | return 0; | |
1276 | } | |
1277 | ||
1278 | #if 0 | |
1279 | static | |
1280 | int wildcard_is_within(struct wildcard_entry *e, | |
1281 | enum lttng_ust_loglevel_type loglevel_type, | |
1282 | int loglevel) | |
1283 | { | |
1284 | if (e->loglevel_type == LTTNG_UST_LOGLEVEL_ALL | |
1285 | || e->loglevel == -1) | |
1286 | return 1; | |
1287 | switch (e->loglevel_type) { | |
1288 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1289 | switch (loglevel_type) { | |
1290 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1291 | if (e->loglevel >= loglevel) | |
1292 | return 1; | |
1293 | else | |
1294 | return 0; | |
1295 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1296 | if (e->loglevel <= 0 && loglevel == 0) | |
1297 | return 1; | |
1298 | else | |
1299 | return 0; | |
1300 | } | |
1301 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1302 | switch (loglevel_type) { | |
1303 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1304 | if (loglevel <= 0) | |
1305 | return 1; | |
1306 | else | |
1307 | return 0; | |
1308 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1309 | if (e->loglevel == loglevel) | |
1310 | return 1; | |
1311 | else | |
1312 | return 0; | |
1313 | } | |
1314 | } | |
1315 | } | |
1316 | #endif | |
1317 | ||
1318 | /* | |
1319 | * Add the wildcard to the wildcard list. Must be called with | |
1320 | * ust lock held. | |
1321 | */ | |
1322 | static | |
1323 | struct session_wildcard *add_wildcard(struct ltt_channel *chan, | |
1324 | struct lttng_ust_event *event_param) | |
1325 | { | |
1326 | struct wildcard_entry *e; | |
1327 | struct session_wildcard *sw; | |
1328 | size_t name_len = strlen(event_param->name) + 1; | |
1329 | int found = 0; | |
1330 | ||
1331 | /* | |
1332 | * Try to find global wildcard entry. Given that this is shared | |
1333 | * across all sessions, we need to check for exact loglevel | |
1334 | * match, not just whether contained within the existing ones. | |
1335 | */ | |
1336 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
1337 | if (!strncmp(event_param->name, e->name, | |
1338 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
1339 | if (wildcard_same_loglevel(e, | |
1340 | event_param->loglevel_type, | |
1341 | event_param->loglevel)) { | |
1342 | found = 1; | |
1343 | break; | |
1344 | } | |
1345 | } | |
1346 | } | |
1347 | ||
1348 | if (!found) { | |
1349 | /* | |
1350 | * Create global wildcard entry if not found. Using | |
1351 | * zmalloc here to allocate a variable length element. | |
1352 | * Could cause some memory fragmentation if overused. | |
1353 | */ | |
1354 | e = zmalloc(sizeof(struct wildcard_entry) + name_len); | |
1355 | if (!e) | |
1356 | return ERR_PTR(-ENOMEM); | |
1357 | memcpy(&e->name[0], event_param->name, name_len); | |
aa141955 MD |
1358 | e->loglevel_type = event_param->loglevel_type; |
1359 | e->loglevel = event_param->loglevel; | |
457a6b58 MD |
1360 | cds_list_add(&e->list, &wildcard_list); |
1361 | CDS_INIT_LIST_HEAD(&e->session_list); | |
1362 | } | |
1363 | ||
1364 | /* session wildcard */ | |
1365 | cds_list_for_each_entry(sw, &e->session_list, session_list) { | |
1366 | if (chan == sw->chan) { | |
1367 | DBG("wildcard %s busy for this channel", | |
1368 | event_param->name); | |
1369 | return ERR_PTR(-EEXIST); /* Already there */ | |
1370 | } | |
1371 | } | |
1372 | sw = zmalloc(sizeof(struct session_wildcard)); | |
1373 | if (!sw) | |
1374 | return ERR_PTR(-ENOMEM); | |
1375 | sw->chan = chan; | |
1376 | sw->enabled = 1; | |
1377 | memcpy(&sw->event_param, event_param, sizeof(sw->event_param)); | |
1378 | sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT; | |
1379 | sw->event_param.loglevel_type = event_param->loglevel_type; | |
1380 | sw->event_param.loglevel = event_param->loglevel; | |
1381 | CDS_INIT_LIST_HEAD(&sw->events); | |
1382 | cds_list_add(&sw->list, &chan->session->wildcards); | |
1383 | cds_list_add(&sw->session_list, &e->session_list); | |
1384 | sw->entry = e; | |
1385 | ltt_probes_create_wildcard_events(e, sw); | |
1386 | return sw; | |
1387 | } | |
1388 | ||
1389 | /* | |
1390 | * Remove the wildcard from the wildcard list. Must be called with | |
1391 | * ust_lock held. Only called at session teardown. | |
1392 | */ | |
1393 | static | |
1394 | void _remove_wildcard(struct session_wildcard *wildcard) | |
1395 | { | |
1396 | struct ltt_event *ev, *tmp; | |
1397 | ||
1398 | /* | |
1399 | * Just remove the events owned (for enable/disable) by this | |
1400 | * wildcard from the list. The session teardown will take care | |
1401 | * of freeing the event memory. | |
1402 | */ | |
1403 | cds_list_for_each_entry_safe(ev, tmp, &wildcard->events, | |
1404 | wildcard_list) { | |
1405 | cds_list_del(&ev->wildcard_list); | |
1406 | } | |
1407 | cds_list_del(&wildcard->session_list); | |
1408 | cds_list_del(&wildcard->list); | |
1409 | if (cds_list_empty(&wildcard->entry->session_list)) { | |
1410 | cds_list_del(&wildcard->entry->list); | |
1411 | free(wildcard->entry); | |
1412 | } | |
1413 | free(wildcard); | |
1414 | } | |
1415 | ||
1416 | int ltt_wildcard_create(struct ltt_channel *chan, | |
1417 | struct lttng_ust_event *event_param, | |
1418 | struct session_wildcard **_sw) | |
1419 | { | |
1420 | struct session_wildcard *sw; | |
1421 | ||
1422 | sw = add_wildcard(chan, event_param); | |
1423 | if (!sw || IS_ERR(sw)) { | |
1424 | return PTR_ERR(sw); | |
1425 | } | |
1426 | *_sw = sw; | |
1427 | return 0; | |
1428 | } | |
1429 | ||
1430 | static | |
1431 | void _ltt_wildcard_destroy(struct session_wildcard *sw) | |
1432 | { | |
1433 | _remove_wildcard(sw); | |
1434 | } | |
1435 | ||
1436 | int ltt_wildcard_enable(struct session_wildcard *wildcard) | |
1437 | { | |
1438 | struct ltt_event *ev; | |
1439 | int ret; | |
1440 | ||
1441 | if (wildcard->enabled) | |
1442 | return -EEXIST; | |
1443 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1444 | ret = ltt_event_enable(ev); | |
1445 | if (ret) { | |
1446 | DBG("Error: enable error.\n"); | |
1447 | return ret; | |
1448 | } | |
1449 | } | |
1450 | wildcard->enabled = 1; | |
1451 | return 0; | |
1452 | } | |
1453 | ||
1454 | int ltt_wildcard_disable(struct session_wildcard *wildcard) | |
1455 | { | |
1456 | struct ltt_event *ev; | |
1457 | int ret; | |
1458 | ||
1459 | if (!wildcard->enabled) | |
1460 | return -EEXIST; | |
1461 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1462 | ret = ltt_event_disable(ev); | |
1463 | if (ret) { | |
1464 | DBG("Error: disable error.\n"); | |
1465 | return ret; | |
1466 | } | |
1467 | } | |
1468 | wildcard->enabled = 0; | |
1469 | return 0; | |
1470 | } | |
eddd8d5d MD |
1471 | |
1472 | /* | |
1473 | * Take the TLS "fault" in libuuid if dlopen'd, which can take the | |
1474 | * dynamic linker mutex, outside of the UST lock, since the UST lock is | |
1475 | * taken in constructors, which are called with dynamic linker mutex | |
1476 | * held. | |
1477 | */ | |
1478 | void lttng_fixup_event_tls(void) | |
1479 | { | |
1480 | unsigned char uuid[37]; | |
1481 | ||
1482 | (void) uuid_generate(uuid); | |
1483 | } |