Commit | Line | Data |
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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)); | |
251 | memcpy(event_param.name, | |
252 | desc->name, | |
253 | sizeof(event_param.name)); | |
254 | /* create event */ | |
255 | ret = ltt_event_create(sw->chan, | |
256 | &event_param, NULL, | |
257 | &ev); | |
258 | if (ret) { | |
259 | DBG("Error creating event"); | |
260 | continue; | |
261 | } | |
262 | cds_list_add(&ev->wildcard_list, | |
263 | &sw->events); | |
264 | } | |
265 | } | |
266 | } | |
267 | ||
48bf7c27 MD |
268 | if (name_len > LTTNG_UST_SYM_NAME_LEN) { |
269 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN); | |
270 | name_len = LTTNG_UST_SYM_NAME_LEN; | |
ff412fb5 | 271 | } |
48bf7c27 | 272 | hash = jhash(name, name_len - 1, 0); |
8165c8da MD |
273 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
274 | cds_hlist_for_each_entry_safe(e, node, p, head, node) { | |
275 | struct ltt_event *event; | |
276 | struct ltt_channel *chan; | |
277 | ||
fe2d02f4 | 278 | if (!ltt_loglevel_match(desc, |
457a6b58 MD |
279 | e->loglevel_type, |
280 | e->loglevel)) { | |
281 | continue; | |
282 | } | |
283 | if (strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) { | |
284 | continue; | |
285 | } | |
fe2d02f4 | 286 | event = e->event; |
8165c8da MD |
287 | chan = event->chan; |
288 | assert(!event->desc); | |
289 | event->desc = desc; | |
290 | event->pending_probe = NULL; | |
291 | remove_pending_probe(e); | |
292 | ret |= __tracepoint_probe_register(name, | |
293 | event->desc->probe_callback, | |
67e5f391 | 294 | event, event->desc->signature); |
636c5aa4 MD |
295 | if (ret) |
296 | continue; | |
297 | event->id = chan->free_event_id++; | |
8165c8da MD |
298 | ret |= _ltt_event_metadata_statedump(chan->session, chan, |
299 | event); | |
300 | } | |
301 | return ret; | |
302 | } | |
303 | ||
8020ceb5 MD |
304 | void synchronize_trace(void) |
305 | { | |
8020ceb5 | 306 | synchronize_rcu(); |
8020ceb5 MD |
307 | } |
308 | ||
309 | struct ltt_session *ltt_session_create(void) | |
310 | { | |
311 | struct ltt_session *session; | |
312 | ||
b5234c06 | 313 | session = zmalloc(sizeof(struct ltt_session)); |
8020ceb5 MD |
314 | if (!session) |
315 | return NULL; | |
b5234c06 MD |
316 | CDS_INIT_LIST_HEAD(&session->chan); |
317 | CDS_INIT_LIST_HEAD(&session->events); | |
e6c12e3d | 318 | CDS_INIT_LIST_HEAD(&session->wildcards); |
578ce73a | 319 | uuid_generate(session->uuid); |
b5234c06 | 320 | cds_list_add(&session->list, &sessions); |
8020ceb5 MD |
321 | return session; |
322 | } | |
323 | ||
324 | void ltt_session_destroy(struct ltt_session *session) | |
325 | { | |
326 | struct ltt_channel *chan, *tmpchan; | |
327 | struct ltt_event *event, *tmpevent; | |
e6c12e3d | 328 | struct session_wildcard *wildcard, *tmpwildcard; |
8020ceb5 MD |
329 | int ret; |
330 | ||
b5234c06 MD |
331 | CMM_ACCESS_ONCE(session->active) = 0; |
332 | cds_list_for_each_entry(event, &session->events, list) { | |
8020ceb5 MD |
333 | ret = _ltt_event_unregister(event); |
334 | WARN_ON(ret); | |
335 | } | |
336 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e6c12e3d MD |
337 | cds_list_for_each_entry_safe(wildcard, tmpwildcard, &session->wildcards, list) |
338 | _ltt_wildcard_destroy(wildcard); | |
b5234c06 | 339 | cds_list_for_each_entry_safe(event, tmpevent, &session->events, list) |
8020ceb5 | 340 | _ltt_event_destroy(event); |
b5234c06 | 341 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list) |
8020ceb5 | 342 | _ltt_channel_destroy(chan); |
b5234c06 | 343 | cds_list_del(&session->list); |
b5234c06 | 344 | free(session); |
8020ceb5 MD |
345 | } |
346 | ||
976fe9ea | 347 | int ltt_session_enable(struct ltt_session *session) |
8020ceb5 MD |
348 | { |
349 | int ret = 0; | |
350 | struct ltt_channel *chan; | |
351 | ||
8020ceb5 MD |
352 | if (session->active) { |
353 | ret = -EBUSY; | |
354 | goto end; | |
355 | } | |
356 | ||
357 | /* | |
358 | * Snapshot the number of events per channel to know the type of header | |
359 | * we need to use. | |
360 | */ | |
b5234c06 | 361 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
362 | if (chan->header_type) |
363 | continue; /* don't change it if session stop/restart */ | |
364 | if (chan->free_event_id < 31) | |
365 | chan->header_type = 1; /* compact */ | |
366 | else | |
367 | chan->header_type = 2; /* large */ | |
368 | } | |
369 | ||
b5234c06 MD |
370 | CMM_ACCESS_ONCE(session->active) = 1; |
371 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
8020ceb5 | 372 | ret = _ltt_session_metadata_statedump(session); |
4b4de73e | 373 | if (ret) |
b5234c06 | 374 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 375 | end: |
8020ceb5 MD |
376 | return ret; |
377 | } | |
378 | ||
976fe9ea | 379 | int ltt_session_disable(struct ltt_session *session) |
8020ceb5 MD |
380 | { |
381 | int ret = 0; | |
382 | ||
8020ceb5 MD |
383 | if (!session->active) { |
384 | ret = -EBUSY; | |
385 | goto end; | |
386 | } | |
b5234c06 | 387 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 388 | end: |
8020ceb5 MD |
389 | return ret; |
390 | } | |
391 | ||
976fe9ea MD |
392 | int ltt_channel_enable(struct ltt_channel *channel) |
393 | { | |
394 | int old; | |
395 | ||
9beb36ba MD |
396 | if (channel == channel->session->metadata) |
397 | return -EPERM; | |
b5234c06 | 398 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
399 | if (old) |
400 | return -EEXIST; | |
401 | return 0; | |
402 | } | |
403 | ||
404 | int ltt_channel_disable(struct ltt_channel *channel) | |
405 | { | |
406 | int old; | |
407 | ||
9beb36ba MD |
408 | if (channel == channel->session->metadata) |
409 | return -EPERM; | |
b5234c06 | 410 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
411 | if (!old) |
412 | return -EEXIST; | |
413 | return 0; | |
414 | } | |
415 | ||
416 | int ltt_event_enable(struct ltt_event *event) | |
417 | { | |
418 | int old; | |
419 | ||
9beb36ba MD |
420 | if (event->chan == event->chan->session->metadata) |
421 | return -EPERM; | |
b5234c06 | 422 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
423 | if (old) |
424 | return -EEXIST; | |
425 | return 0; | |
426 | } | |
427 | ||
428 | int ltt_event_disable(struct ltt_event *event) | |
429 | { | |
430 | int old; | |
431 | ||
9beb36ba MD |
432 | if (event->chan == event->chan->session->metadata) |
433 | return -EPERM; | |
b5234c06 | 434 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
435 | if (!old) |
436 | return -EEXIST; | |
437 | return 0; | |
438 | } | |
439 | ||
8020ceb5 MD |
440 | struct ltt_channel *ltt_channel_create(struct ltt_session *session, |
441 | const char *transport_name, | |
442 | void *buf_addr, | |
443 | size_t subbuf_size, size_t num_subbuf, | |
444 | unsigned int switch_timer_interval, | |
193183fb | 445 | unsigned int read_timer_interval, |
ef9ff354 MD |
446 | int **shm_fd, int **wait_fd, |
447 | uint64_t **memory_map_size, | |
d028eddb | 448 | struct ltt_channel *chan_priv_init) |
8020ceb5 | 449 | { |
a3f61e7f | 450 | struct ltt_channel *chan = NULL; |
8020ceb5 MD |
451 | struct ltt_transport *transport; |
452 | ||
8020ceb5 MD |
453 | if (session->been_active) |
454 | goto active; /* Refuse to add channel to active session */ | |
455 | transport = ltt_transport_find(transport_name); | |
456 | if (!transport) { | |
b5234c06 | 457 | DBG("LTTng transport %s not found\n", |
8020ceb5 MD |
458 | transport_name); |
459 | goto notransport; | |
460 | } | |
d028eddb MD |
461 | chan_priv_init->id = session->free_chan_id++; |
462 | chan_priv_init->session = session; | |
8020ceb5 MD |
463 | /* |
464 | * Note: the channel creation op already writes into the packet | |
465 | * headers. Therefore the "chan" information used as input | |
466 | * should be already accessible. | |
467 | */ | |
e7372d13 | 468 | chan = transport->ops.channel_create(transport_name, buf_addr, |
8020ceb5 | 469 | subbuf_size, num_subbuf, switch_timer_interval, |
193183fb | 470 | read_timer_interval, shm_fd, wait_fd, |
d028eddb | 471 | memory_map_size, chan_priv_init); |
a3f61e7f | 472 | if (!chan) |
8020ceb5 | 473 | goto create_error; |
976fe9ea | 474 | chan->enabled = 1; |
8020ceb5 | 475 | chan->ops = &transport->ops; |
b5234c06 | 476 | cds_list_add(&chan->list, &session->chan); |
8020ceb5 MD |
477 | return chan; |
478 | ||
479 | create_error: | |
8020ceb5 MD |
480 | notransport: |
481 | active: | |
8020ceb5 MD |
482 | return NULL; |
483 | } | |
484 | ||
485 | /* | |
486 | * Only used internally at session destruction. | |
487 | */ | |
488 | static | |
489 | void _ltt_channel_destroy(struct ltt_channel *chan) | |
490 | { | |
b5234c06 | 491 | cds_list_del(&chan->list); |
8020ceb5 | 492 | lttng_destroy_context(chan->ctx); |
a3f61e7f | 493 | chan->ops->channel_destroy(chan); |
8020ceb5 MD |
494 | } |
495 | ||
496 | /* | |
497 | * Supports event creation while tracing session is active. | |
498 | */ | |
576599a0 MD |
499 | int ltt_event_create(struct ltt_channel *chan, |
500 | struct lttng_ust_event *event_param, | |
501 | void *filter, | |
502 | struct ltt_event **_event) | |
8020ceb5 | 503 | { |
457a6b58 | 504 | const struct lttng_event_desc *desc = NULL; /* silence gcc */ |
8020ceb5 | 505 | struct ltt_event *event; |
576599a0 | 506 | int ret = 0; |
8020ceb5 | 507 | |
38eb0baa | 508 | if (chan->used_event_id == -1U) { |
576599a0 | 509 | ret = -ENOMEM; |
8020ceb5 | 510 | goto full; |
576599a0 | 511 | } |
8020ceb5 MD |
512 | /* |
513 | * This is O(n^2) (for each event, the loop is called at event | |
514 | * creation). Might require a hash if we have lots of events. | |
515 | */ | |
576599a0 | 516 | cds_list_for_each_entry(event, &chan->session->events, list) { |
ff412fb5 MD |
517 | if (event->desc && !strncmp(event->desc->name, |
518 | event_param->name, | |
519 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
576599a0 | 520 | ret = -EEXIST; |
8020ceb5 | 521 | goto exist; |
576599a0 MD |
522 | } |
523 | } | |
457a6b58 MD |
524 | |
525 | /* | |
526 | * Check if loglevel match. Refuse to connect event if not. | |
527 | */ | |
528 | if (event_param->instrumentation == LTTNG_UST_TRACEPOINT) { | |
529 | desc = ltt_event_get(event_param->name); | |
fe2d02f4 MD |
530 | if (desc) { |
531 | if (!ltt_loglevel_match(desc, | |
532 | event_param->loglevel_type, | |
533 | event_param->loglevel)) { | |
534 | ret = -EPERM; | |
535 | goto no_loglevel_match; | |
536 | } | |
457a6b58 | 537 | } |
fe2d02f4 MD |
538 | /* |
539 | * If descriptor is not there, it will be added to | |
540 | * pending probes. | |
541 | */ | |
457a6b58 | 542 | } |
b5234c06 | 543 | event = zmalloc(sizeof(struct ltt_event)); |
576599a0 MD |
544 | if (!event) { |
545 | ret = -ENOMEM; | |
8020ceb5 | 546 | goto cache_error; |
576599a0 | 547 | } |
8020ceb5 MD |
548 | event->chan = chan; |
549 | event->filter = filter; | |
8165c8da MD |
550 | /* |
551 | * used_event_id counts the maximum number of event IDs that can | |
552 | * register if all probes register. | |
553 | */ | |
554 | chan->used_event_id++; | |
976fe9ea | 555 | event->enabled = 1; |
8020ceb5 MD |
556 | event->instrumentation = event_param->instrumentation; |
557 | /* Populate ltt_event structure before tracepoint registration. */ | |
b5234c06 | 558 | cmm_smp_wmb(); |
8020ceb5 | 559 | switch (event_param->instrumentation) { |
b5234c06 | 560 | case LTTNG_UST_TRACEPOINT: |
457a6b58 | 561 | event->desc = desc; |
8165c8da MD |
562 | if (event->desc) { |
563 | ret = __tracepoint_probe_register(event_param->name, | |
564 | event->desc->probe_callback, | |
67e5f391 | 565 | event, event->desc->signature); |
8165c8da MD |
566 | if (ret) |
567 | goto register_error; | |
568 | event->id = chan->free_event_id++; | |
569 | } else { | |
570 | /* | |
571 | * If the probe is not present, event->desc stays NULL, | |
572 | * waiting for the probe to register, and the event->id | |
573 | * stays unallocated. | |
574 | */ | |
457a6b58 MD |
575 | ret = add_pending_probe(event, event_param->name, |
576 | event_param->loglevel_type, | |
577 | event_param->loglevel); | |
8165c8da MD |
578 | if (ret) |
579 | goto add_pending_error; | |
580 | } | |
8020ceb5 | 581 | break; |
8020ceb5 MD |
582 | default: |
583 | WARN_ON_ONCE(1); | |
584 | } | |
8165c8da MD |
585 | if (event->desc) { |
586 | ret = _ltt_event_metadata_statedump(chan->session, chan, event); | |
587 | if (ret) | |
588 | goto statedump_error; | |
589 | } | |
b5234c06 | 590 | cds_list_add(&event->list, &chan->session->events); |
576599a0 MD |
591 | *_event = event; |
592 | return 0; | |
8020ceb5 MD |
593 | |
594 | statedump_error: | |
8165c8da MD |
595 | if (event->desc) { |
596 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_param->name, | |
597 | event->desc->probe_callback, | |
598 | event)); | |
599 | ltt_event_put(event->desc); | |
600 | } | |
601 | add_pending_error: | |
8020ceb5 | 602 | register_error: |
b5234c06 | 603 | free(event); |
8020ceb5 | 604 | cache_error: |
457a6b58 | 605 | no_loglevel_match: |
8020ceb5 MD |
606 | exist: |
607 | full: | |
576599a0 | 608 | return ret; |
8020ceb5 MD |
609 | } |
610 | ||
611 | /* | |
612 | * Only used internally at session destruction. | |
613 | */ | |
614 | int _ltt_event_unregister(struct ltt_event *event) | |
615 | { | |
616 | int ret = -EINVAL; | |
617 | ||
618 | switch (event->instrumentation) { | |
b5234c06 | 619 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
620 | if (event->desc) { |
621 | ret = __tracepoint_probe_unregister(event->desc->name, | |
622 | event->desc->probe_callback, | |
623 | event); | |
624 | if (ret) | |
625 | return ret; | |
626 | } else { | |
627 | remove_pending_probe(event->pending_probe); | |
628 | ret = 0; | |
629 | } | |
8020ceb5 | 630 | break; |
8020ceb5 MD |
631 | default: |
632 | WARN_ON_ONCE(1); | |
633 | } | |
634 | return ret; | |
635 | } | |
636 | ||
637 | /* | |
638 | * Only used internally at session destruction. | |
639 | */ | |
640 | static | |
641 | void _ltt_event_destroy(struct ltt_event *event) | |
642 | { | |
643 | switch (event->instrumentation) { | |
b5234c06 | 644 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
645 | if (event->desc) { |
646 | ltt_event_put(event->desc); | |
647 | } | |
8020ceb5 | 648 | break; |
8020ceb5 MD |
649 | default: |
650 | WARN_ON_ONCE(1); | |
651 | } | |
b5234c06 | 652 | cds_list_del(&event->list); |
8020ceb5 | 653 | lttng_destroy_context(event->ctx); |
b5234c06 | 654 | free(event); |
8020ceb5 MD |
655 | } |
656 | ||
657 | /* | |
658 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 659 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
660 | * remaining space left in packet and write, since mutual exclusion |
661 | * protects us from concurrent writes. | |
662 | */ | |
663 | int lttng_metadata_printf(struct ltt_session *session, | |
664 | const char *fmt, ...) | |
665 | { | |
4cfec15c | 666 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
8020ceb5 | 667 | struct ltt_channel *chan = session->metadata; |
b5234c06 | 668 | char *str = NULL; |
8020ceb5 MD |
669 | int ret = 0, waitret; |
670 | size_t len, reserve_len, pos; | |
671 | va_list ap; | |
672 | ||
b5234c06 | 673 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
674 | |
675 | va_start(ap, fmt); | |
b5234c06 | 676 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 677 | va_end(ap); |
b5234c06 | 678 | if (ret < 0) |
8020ceb5 MD |
679 | return -ENOMEM; |
680 | ||
681 | len = strlen(str); | |
682 | pos = 0; | |
683 | ||
684 | for (pos = 0; pos < len; pos += reserve_len) { | |
685 | reserve_len = min_t(size_t, | |
1d498196 | 686 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
687 | len - pos); |
688 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 689 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
690 | /* |
691 | * We don't care about metadata buffer's records lost | |
692 | * count, because we always retry here. Report error if | |
693 | * we need to bail out after timeout or being | |
694 | * interrupted. | |
695 | */ | |
b5234c06 | 696 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
697 | ({ |
698 | ret = chan->ops->event_reserve(&ctx, 0); | |
699 | ret != -ENOBUFS || !ret; | |
700 | }), | |
b5234c06 | 701 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 702 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
703 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
704 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 705 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 706 | if (waitret == -EINTR) |
8020ceb5 MD |
707 | ret = waitret; |
708 | goto end; | |
709 | } | |
710 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
711 | chan->ops->event_commit(&ctx); | |
712 | } | |
713 | end: | |
b5234c06 | 714 | free(str); |
8020ceb5 MD |
715 | return ret; |
716 | } | |
717 | ||
718 | static | |
719 | int _ltt_field_statedump(struct ltt_session *session, | |
720 | const struct lttng_event_field *field) | |
721 | { | |
722 | int ret = 0; | |
723 | ||
724 | switch (field->type.atype) { | |
725 | case atype_integer: | |
726 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 727 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
728 | field->type.u.basic.integer.size, |
729 | field->type.u.basic.integer.alignment, | |
730 | field->type.u.basic.integer.signedness, | |
731 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
732 | ? "none" | |
733 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
734 | ? "UTF8" | |
735 | : "ASCII", | |
736 | field->type.u.basic.integer.base, | |
8a98a75d | 737 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
738 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
739 | #else | |
740 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
741 | #endif | |
742 | field->name); | |
743 | break; | |
744 | case atype_float: | |
745 | ret = lttng_metadata_printf(session, | |
8a98a75d | 746 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
747 | field->type.u.basic._float.exp_dig, |
748 | field->type.u.basic._float.mant_dig, | |
749 | field->type.u.basic._float.alignment, | |
8a98a75d | 750 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
751 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
752 | #else | |
753 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
754 | #endif | |
755 | field->name); | |
756 | break; | |
757 | case atype_enum: | |
758 | ret = lttng_metadata_printf(session, | |
759 | " %s %s;\n", | |
760 | field->type.u.basic.enumeration.name, | |
761 | field->name); | |
762 | break; | |
763 | case atype_array: | |
764 | { | |
765 | const struct lttng_basic_type *elem_type; | |
766 | ||
767 | elem_type = &field->type.u.array.elem_type; | |
768 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 769 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
770 | elem_type->u.basic.integer.size, |
771 | elem_type->u.basic.integer.alignment, | |
772 | elem_type->u.basic.integer.signedness, | |
773 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
774 | ? "none" | |
775 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
776 | ? "UTF8" | |
777 | : "ASCII", | |
778 | elem_type->u.basic.integer.base, | |
8a98a75d | 779 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
780 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
781 | #else | |
782 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
783 | #endif | |
784 | field->name, field->type.u.array.length); | |
785 | break; | |
786 | } | |
787 | case atype_sequence: | |
788 | { | |
789 | const struct lttng_basic_type *elem_type; | |
790 | const struct lttng_basic_type *length_type; | |
791 | ||
792 | elem_type = &field->type.u.sequence.elem_type; | |
793 | length_type = &field->type.u.sequence.length_type; | |
794 | ret = lttng_metadata_printf(session, | |
795 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
796 | length_type->u.basic.integer.size, | |
797 | (unsigned int) length_type->u.basic.integer.alignment, | |
798 | length_type->u.basic.integer.signedness, | |
799 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
800 | ? "none" | |
801 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
802 | ? "UTF8" | |
803 | : "ASCII"), | |
804 | length_type->u.basic.integer.base, | |
8a98a75d | 805 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
806 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
807 | #else | |
808 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
809 | #endif | |
810 | field->name); | |
811 | if (ret) | |
812 | return ret; | |
813 | ||
814 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 815 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
816 | elem_type->u.basic.integer.size, |
817 | (unsigned int) elem_type->u.basic.integer.alignment, | |
818 | elem_type->u.basic.integer.signedness, | |
819 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
820 | ? "none" | |
821 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
822 | ? "UTF8" | |
823 | : "ASCII"), | |
824 | elem_type->u.basic.integer.base, | |
8a98a75d | 825 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
826 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
827 | #else | |
828 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
829 | #endif | |
830 | field->name, | |
831 | field->name); | |
832 | break; | |
833 | } | |
834 | ||
835 | case atype_string: | |
836 | /* Default encoding is UTF8 */ | |
837 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 838 | " string%s _%s;\n", |
8020ceb5 MD |
839 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
840 | " { encoding = ASCII; }" : "", | |
841 | field->name); | |
842 | break; | |
843 | default: | |
844 | WARN_ON_ONCE(1); | |
845 | return -EINVAL; | |
846 | } | |
847 | return ret; | |
848 | } | |
849 | ||
850 | static | |
851 | int _ltt_context_metadata_statedump(struct ltt_session *session, | |
852 | struct lttng_ctx *ctx) | |
853 | { | |
854 | int ret = 0; | |
855 | int i; | |
856 | ||
857 | if (!ctx) | |
858 | return 0; | |
859 | for (i = 0; i < ctx->nr_fields; i++) { | |
860 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
861 | ||
862 | ret = _ltt_field_statedump(session, &field->event_field); | |
863 | if (ret) | |
864 | return ret; | |
865 | } | |
866 | return ret; | |
867 | } | |
868 | ||
869 | static | |
870 | int _ltt_fields_metadata_statedump(struct ltt_session *session, | |
871 | struct ltt_event *event) | |
872 | { | |
873 | const struct lttng_event_desc *desc = event->desc; | |
874 | int ret = 0; | |
875 | int i; | |
876 | ||
877 | for (i = 0; i < desc->nr_fields; i++) { | |
878 | const struct lttng_event_field *field = &desc->fields[i]; | |
879 | ||
880 | ret = _ltt_field_statedump(session, field); | |
881 | if (ret) | |
882 | return ret; | |
883 | } | |
884 | return ret; | |
885 | } | |
886 | ||
887 | static | |
888 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
889 | struct ltt_channel *chan, | |
890 | struct ltt_event *event) | |
891 | { | |
892 | int ret = 0; | |
8155c5e8 | 893 | int loglevel = TRACE_DEFAULT; |
8020ceb5 | 894 | |
b5234c06 | 895 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
896 | return 0; |
897 | if (chan == session->metadata) | |
898 | return 0; | |
8165c8da MD |
899 | /* |
900 | * Don't print events for which probe load is pending. | |
901 | */ | |
902 | if (!event->desc) | |
903 | return 0; | |
8020ceb5 MD |
904 | |
905 | ret = lttng_metadata_printf(session, | |
906 | "event {\n" | |
7083f0fe | 907 | " name = \"%s\";\n" |
8020ceb5 MD |
908 | " id = %u;\n" |
909 | " stream_id = %u;\n", | |
910 | event->desc->name, | |
911 | event->id, | |
912 | event->chan->id); | |
913 | if (ret) | |
914 | goto end; | |
915 | ||
8155c5e8 MD |
916 | if (event->desc->loglevel) |
917 | loglevel = *(*event->desc->loglevel); | |
918 | ||
919 | ret = lttng_metadata_printf(session, | |
920 | " loglevel = %d;\n", | |
921 | loglevel); | |
922 | if (ret) | |
923 | goto end; | |
e6c12e3d | 924 | |
8020ceb5 MD |
925 | if (event->ctx) { |
926 | ret = lttng_metadata_printf(session, | |
927 | " context := struct {\n"); | |
928 | if (ret) | |
929 | goto end; | |
930 | } | |
931 | ret = _ltt_context_metadata_statedump(session, event->ctx); | |
932 | if (ret) | |
933 | goto end; | |
934 | if (event->ctx) { | |
935 | ret = lttng_metadata_printf(session, | |
936 | " };\n"); | |
937 | if (ret) | |
938 | goto end; | |
939 | } | |
940 | ||
941 | ret = lttng_metadata_printf(session, | |
942 | " fields := struct {\n" | |
943 | ); | |
944 | if (ret) | |
945 | goto end; | |
946 | ||
947 | ret = _ltt_fields_metadata_statedump(session, event); | |
948 | if (ret) | |
949 | goto end; | |
950 | ||
951 | /* | |
952 | * LTTng space reservation can only reserve multiples of the | |
953 | * byte size. | |
954 | */ | |
955 | ret = lttng_metadata_printf(session, | |
956 | " };\n" | |
957 | "};\n\n"); | |
958 | if (ret) | |
959 | goto end; | |
960 | ||
961 | event->metadata_dumped = 1; | |
962 | end: | |
963 | return ret; | |
964 | ||
965 | } | |
966 | ||
967 | static | |
968 | int _ltt_channel_metadata_statedump(struct ltt_session *session, | |
969 | struct ltt_channel *chan) | |
970 | { | |
971 | int ret = 0; | |
972 | ||
b5234c06 | 973 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
974 | return 0; |
975 | if (chan == session->metadata) | |
976 | return 0; | |
977 | ||
978 | WARN_ON_ONCE(!chan->header_type); | |
979 | ret = lttng_metadata_printf(session, | |
980 | "stream {\n" | |
981 | " id = %u;\n" | |
982 | " event.header := %s;\n" | |
983 | " packet.context := struct packet_context;\n", | |
984 | chan->id, | |
985 | chan->header_type == 1 ? "struct event_header_compact" : | |
986 | "struct event_header_large"); | |
987 | if (ret) | |
988 | goto end; | |
989 | ||
990 | if (chan->ctx) { | |
991 | ret = lttng_metadata_printf(session, | |
992 | " event.context := struct {\n"); | |
993 | if (ret) | |
994 | goto end; | |
995 | } | |
996 | ret = _ltt_context_metadata_statedump(session, chan->ctx); | |
997 | if (ret) | |
998 | goto end; | |
999 | if (chan->ctx) { | |
1000 | ret = lttng_metadata_printf(session, | |
1001 | " };\n"); | |
1002 | if (ret) | |
1003 | goto end; | |
1004 | } | |
1005 | ||
1006 | ret = lttng_metadata_printf(session, | |
1007 | "};\n\n"); | |
1008 | ||
1009 | chan->metadata_dumped = 1; | |
1010 | end: | |
1011 | return ret; | |
1012 | } | |
1013 | ||
1014 | static | |
1015 | int _ltt_stream_packet_context_declare(struct ltt_session *session) | |
1016 | { | |
1017 | return lttng_metadata_printf(session, | |
1018 | "struct packet_context {\n" | |
28b12049 MD |
1019 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1020 | " uint64_clock_monotonic_t timestamp_end;\n" | |
8020ceb5 MD |
1021 | " uint32_t events_discarded;\n" |
1022 | " uint32_t content_size;\n" | |
1023 | " uint32_t packet_size;\n" | |
1024 | " uint32_t cpu_id;\n" | |
1025 | "};\n\n" | |
1026 | ); | |
1027 | } | |
1028 | ||
1029 | /* | |
1030 | * Compact header: | |
1031 | * id: range: 0 - 30. | |
1032 | * id 31 is reserved to indicate an extended header. | |
1033 | * | |
1034 | * Large header: | |
1035 | * id: range: 0 - 65534. | |
1036 | * id 65535 is reserved to indicate an extended header. | |
1037 | */ | |
1038 | static | |
1039 | int _ltt_event_header_declare(struct ltt_session *session) | |
1040 | { | |
1041 | return lttng_metadata_printf(session, | |
1042 | "struct event_header_compact {\n" | |
1043 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1044 | " variant <id> {\n" | |
1045 | " struct {\n" | |
28b12049 | 1046 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1047 | " } compact;\n" |
1048 | " struct {\n" | |
1049 | " uint32_t id;\n" | |
28b12049 | 1050 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1051 | " } extended;\n" |
1052 | " } v;\n" | |
1053 | "} align(%u);\n" | |
1054 | "\n" | |
1055 | "struct event_header_large {\n" | |
1056 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1057 | " variant <id> {\n" | |
1058 | " struct {\n" | |
28b12049 | 1059 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1060 | " } compact;\n" |
1061 | " struct {\n" | |
1062 | " uint32_t id;\n" | |
28b12049 | 1063 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1064 | " } extended;\n" |
1065 | " } v;\n" | |
1066 | "} align(%u);\n\n", | |
1dbfff0c MD |
1067 | lttng_alignof(uint32_t) * CHAR_BIT, |
1068 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1069 | ); |
1070 | } | |
1071 | ||
28b12049 MD |
1072 | /* |
1073 | * Approximation of NTP time of day to clock monotonic correlation, | |
1074 | * taken at start of trace. | |
1075 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1076 | * in future versions. | |
1077 | */ | |
1078 | static | |
1079 | uint64_t measure_clock_offset(void) | |
1080 | { | |
1081 | uint64_t offset, monotonic[2], realtime; | |
1082 | struct timespec rts = { 0, 0 }; | |
1083 | int ret; | |
1084 | ||
1085 | monotonic[0] = trace_clock_read64(); | |
1086 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1087 | if (ret < 0) | |
1088 | return 0; | |
1089 | monotonic[1] = trace_clock_read64(); | |
1090 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
17ec046a | 1091 | realtime = (uint64_t) rts.tv_sec * 1000000000ULL; |
28b12049 MD |
1092 | realtime += rts.tv_nsec; |
1093 | offset = realtime - offset; | |
1094 | return offset; | |
1095 | } | |
1096 | ||
8020ceb5 MD |
1097 | /* |
1098 | * Output metadata into this session's metadata buffers. | |
1099 | */ | |
1100 | static | |
1101 | int _ltt_session_metadata_statedump(struct ltt_session *session) | |
1102 | { | |
b5234c06 | 1103 | unsigned char *uuid_c = session->uuid; |
578ce73a | 1104 | char uuid_s[37], clock_uuid_s[CLOCK_UUID_LEN]; |
8020ceb5 MD |
1105 | struct ltt_channel *chan; |
1106 | struct ltt_event *event; | |
1107 | int ret = 0; | |
4c1ee94e | 1108 | char procname[PROCNAME_LEN] = ""; |
8020ceb5 | 1109 | |
b5234c06 | 1110 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1111 | return 0; |
1112 | if (session->metadata_dumped) | |
1113 | goto skip_session; | |
1114 | if (!session->metadata) { | |
b5234c06 | 1115 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1116 | return -EPERM; |
1117 | } | |
1118 | ||
1119 | snprintf(uuid_s, sizeof(uuid_s), | |
1120 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1121 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1122 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1123 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1124 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1125 | ||
1126 | ret = lttng_metadata_printf(session, | |
1127 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1128 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1129 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1130 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
1131 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" | |
1132 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1133 | "\n" | |
1134 | "trace {\n" | |
1135 | " major = %u;\n" | |
1136 | " minor = %u;\n" | |
1137 | " uuid = \"%s\";\n" | |
1138 | " byte_order = %s;\n" | |
1139 | " packet.header := struct {\n" | |
1140 | " uint32_t magic;\n" | |
1141 | " uint8_t uuid[16];\n" | |
1142 | " uint32_t stream_id;\n" | |
1143 | " };\n" | |
1144 | "};\n\n", | |
1dbfff0c MD |
1145 | lttng_alignof(uint8_t) * CHAR_BIT, |
1146 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1147 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1148 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2694975d MD |
1149 | CTF_SPEC_MAJOR, |
1150 | CTF_SPEC_MINOR, | |
8020ceb5 | 1151 | uuid_s, |
8a98a75d | 1152 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1153 | "be" |
1154 | #else | |
1155 | "le" | |
1156 | #endif | |
1157 | ); | |
1158 | if (ret) | |
1159 | goto end; | |
1160 | ||
b020e504 | 1161 | /* ignore error, just use empty string if error. */ |
4c1ee94e MD |
1162 | (void) prctl(PR_GET_NAME, (unsigned long) procname, 0, 0, 0); |
1163 | procname[PROCNAME_LEN - 1] = '\0'; | |
b020e504 MD |
1164 | ret = lttng_metadata_printf(session, |
1165 | "env {\n" | |
1166 | " vpid = %d;\n" | |
1167 | " procname = \"%s\";\n" | |
2694975d MD |
1168 | " domain = \"ust\";\n" |
1169 | " tracer_name = \"lttng-ust\";\n" | |
1170 | " tracer_major = %u;\n" | |
1171 | " tracer_minor = %u;\n" | |
1172 | " tracer_patchlevel = %u;\n" | |
b020e504 MD |
1173 | "};\n\n", |
1174 | (int) getpid(), | |
1175 | procname, | |
2694975d MD |
1176 | LTTNG_UST_MAJOR_VERSION, |
1177 | LTTNG_UST_MINOR_VERSION, | |
1178 | LTTNG_UST_PATCHLEVEL_VERSION | |
b020e504 MD |
1179 | ); |
1180 | if (ret) | |
1181 | goto end; | |
1182 | ||
28b12049 MD |
1183 | ret = lttng_metadata_printf(session, |
1184 | "clock {\n" | |
939950af MD |
1185 | " name = %s;\n", |
1186 | "monotonic" | |
1187 | ); | |
1188 | if (ret) | |
1189 | goto end; | |
1190 | ||
1191 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1192 | ret = lttng_metadata_printf(session, | |
1193 | " uuid = \"%s\";\n", | |
1194 | clock_uuid_s | |
1195 | ); | |
1196 | if (ret) | |
1197 | goto end; | |
1198 | } | |
1199 | ||
1200 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1201 | " description = \"Monotonic Clock\";\n" |
1202 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1203 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1204 | " offset = %" PRIu64 ";\n" | |
1205 | "};\n\n", | |
28b12049 MD |
1206 | trace_clock_freq(), |
1207 | measure_clock_offset() | |
1208 | ); | |
1209 | if (ret) | |
1210 | goto end; | |
1211 | ||
1212 | ret = lttng_metadata_printf(session, | |
1213 | "typealias integer {\n" | |
1214 | " size = 27; align = 1; signed = false;\n" | |
1215 | " map = clock.monotonic.value;\n" | |
1216 | "} := uint27_clock_monotonic_t;\n" | |
1217 | "\n" | |
1218 | "typealias integer {\n" | |
1219 | " size = 32; align = %u; signed = false;\n" | |
1220 | " map = clock.monotonic.value;\n" | |
1221 | "} := uint32_clock_monotonic_t;\n" | |
1222 | "\n" | |
1223 | "typealias integer {\n" | |
1224 | " size = 64; align = %u; signed = false;\n" | |
1225 | " map = clock.monotonic.value;\n" | |
1226 | "} := uint64_clock_monotonic_t;\n\n", | |
1227 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1228 | lttng_alignof(uint64_t) * CHAR_BIT | |
1229 | ); | |
1230 | if (ret) | |
1231 | goto end; | |
1232 | ||
8020ceb5 MD |
1233 | ret = _ltt_stream_packet_context_declare(session); |
1234 | if (ret) | |
1235 | goto end; | |
1236 | ||
1237 | ret = _ltt_event_header_declare(session); | |
1238 | if (ret) | |
1239 | goto end; | |
1240 | ||
1241 | skip_session: | |
b5234c06 | 1242 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
1243 | ret = _ltt_channel_metadata_statedump(session, chan); |
1244 | if (ret) | |
1245 | goto end; | |
1246 | } | |
1247 | ||
b5234c06 | 1248 | cds_list_for_each_entry(event, &session->events, list) { |
8020ceb5 MD |
1249 | ret = _ltt_event_metadata_statedump(session, event->chan, event); |
1250 | if (ret) | |
1251 | goto end; | |
1252 | } | |
1253 | session->metadata_dumped = 1; | |
1254 | end: | |
1255 | return ret; | |
1256 | } | |
1257 | ||
003fedf4 | 1258 | void lttng_ust_events_exit(void) |
8020ceb5 MD |
1259 | { |
1260 | struct ltt_session *session, *tmpsession; | |
1261 | ||
b5234c06 | 1262 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, list) |
8020ceb5 | 1263 | ltt_session_destroy(session); |
8020ceb5 | 1264 | } |
457a6b58 MD |
1265 | |
1266 | /* WILDCARDS */ | |
1267 | ||
1268 | static | |
1269 | int wildcard_same_loglevel(struct wildcard_entry *e, | |
1270 | enum lttng_ust_loglevel_type loglevel_type, | |
1271 | int loglevel) | |
1272 | { | |
1273 | if (e->loglevel_type == loglevel_type && e->loglevel == loglevel) | |
1274 | return 1; | |
1275 | else | |
1276 | return 0; | |
1277 | } | |
1278 | ||
1279 | #if 0 | |
1280 | static | |
1281 | int wildcard_is_within(struct wildcard_entry *e, | |
1282 | enum lttng_ust_loglevel_type loglevel_type, | |
1283 | int loglevel) | |
1284 | { | |
1285 | if (e->loglevel_type == LTTNG_UST_LOGLEVEL_ALL | |
1286 | || e->loglevel == -1) | |
1287 | return 1; | |
1288 | switch (e->loglevel_type) { | |
1289 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1290 | switch (loglevel_type) { | |
1291 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1292 | if (e->loglevel >= loglevel) | |
1293 | return 1; | |
1294 | else | |
1295 | return 0; | |
1296 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1297 | if (e->loglevel <= 0 && loglevel == 0) | |
1298 | return 1; | |
1299 | else | |
1300 | return 0; | |
1301 | } | |
1302 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1303 | switch (loglevel_type) { | |
1304 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1305 | if (loglevel <= 0) | |
1306 | return 1; | |
1307 | else | |
1308 | return 0; | |
1309 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1310 | if (e->loglevel == loglevel) | |
1311 | return 1; | |
1312 | else | |
1313 | return 0; | |
1314 | } | |
1315 | } | |
1316 | } | |
1317 | #endif | |
1318 | ||
1319 | /* | |
1320 | * Add the wildcard to the wildcard list. Must be called with | |
1321 | * ust lock held. | |
1322 | */ | |
1323 | static | |
1324 | struct session_wildcard *add_wildcard(struct ltt_channel *chan, | |
1325 | struct lttng_ust_event *event_param) | |
1326 | { | |
1327 | struct wildcard_entry *e; | |
1328 | struct session_wildcard *sw; | |
1329 | size_t name_len = strlen(event_param->name) + 1; | |
1330 | int found = 0; | |
1331 | ||
1332 | /* | |
1333 | * Try to find global wildcard entry. Given that this is shared | |
1334 | * across all sessions, we need to check for exact loglevel | |
1335 | * match, not just whether contained within the existing ones. | |
1336 | */ | |
1337 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
1338 | if (!strncmp(event_param->name, e->name, | |
1339 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
1340 | if (wildcard_same_loglevel(e, | |
1341 | event_param->loglevel_type, | |
1342 | event_param->loglevel)) { | |
1343 | found = 1; | |
1344 | break; | |
1345 | } | |
1346 | } | |
1347 | } | |
1348 | ||
1349 | if (!found) { | |
1350 | /* | |
1351 | * Create global wildcard entry if not found. Using | |
1352 | * zmalloc here to allocate a variable length element. | |
1353 | * Could cause some memory fragmentation if overused. | |
1354 | */ | |
1355 | e = zmalloc(sizeof(struct wildcard_entry) + name_len); | |
1356 | if (!e) | |
1357 | return ERR_PTR(-ENOMEM); | |
1358 | memcpy(&e->name[0], event_param->name, name_len); | |
1359 | cds_list_add(&e->list, &wildcard_list); | |
1360 | CDS_INIT_LIST_HEAD(&e->session_list); | |
1361 | } | |
1362 | ||
1363 | /* session wildcard */ | |
1364 | cds_list_for_each_entry(sw, &e->session_list, session_list) { | |
1365 | if (chan == sw->chan) { | |
1366 | DBG("wildcard %s busy for this channel", | |
1367 | event_param->name); | |
1368 | return ERR_PTR(-EEXIST); /* Already there */ | |
1369 | } | |
1370 | } | |
1371 | sw = zmalloc(sizeof(struct session_wildcard)); | |
1372 | if (!sw) | |
1373 | return ERR_PTR(-ENOMEM); | |
1374 | sw->chan = chan; | |
1375 | sw->enabled = 1; | |
1376 | memcpy(&sw->event_param, event_param, sizeof(sw->event_param)); | |
1377 | sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT; | |
1378 | sw->event_param.loglevel_type = event_param->loglevel_type; | |
1379 | sw->event_param.loglevel = event_param->loglevel; | |
1380 | CDS_INIT_LIST_HEAD(&sw->events); | |
1381 | cds_list_add(&sw->list, &chan->session->wildcards); | |
1382 | cds_list_add(&sw->session_list, &e->session_list); | |
1383 | sw->entry = e; | |
1384 | ltt_probes_create_wildcard_events(e, sw); | |
1385 | return sw; | |
1386 | } | |
1387 | ||
1388 | /* | |
1389 | * Remove the wildcard from the wildcard list. Must be called with | |
1390 | * ust_lock held. Only called at session teardown. | |
1391 | */ | |
1392 | static | |
1393 | void _remove_wildcard(struct session_wildcard *wildcard) | |
1394 | { | |
1395 | struct ltt_event *ev, *tmp; | |
1396 | ||
1397 | /* | |
1398 | * Just remove the events owned (for enable/disable) by this | |
1399 | * wildcard from the list. The session teardown will take care | |
1400 | * of freeing the event memory. | |
1401 | */ | |
1402 | cds_list_for_each_entry_safe(ev, tmp, &wildcard->events, | |
1403 | wildcard_list) { | |
1404 | cds_list_del(&ev->wildcard_list); | |
1405 | } | |
1406 | cds_list_del(&wildcard->session_list); | |
1407 | cds_list_del(&wildcard->list); | |
1408 | if (cds_list_empty(&wildcard->entry->session_list)) { | |
1409 | cds_list_del(&wildcard->entry->list); | |
1410 | free(wildcard->entry); | |
1411 | } | |
1412 | free(wildcard); | |
1413 | } | |
1414 | ||
1415 | int ltt_wildcard_create(struct ltt_channel *chan, | |
1416 | struct lttng_ust_event *event_param, | |
1417 | struct session_wildcard **_sw) | |
1418 | { | |
1419 | struct session_wildcard *sw; | |
1420 | ||
1421 | sw = add_wildcard(chan, event_param); | |
1422 | if (!sw || IS_ERR(sw)) { | |
1423 | return PTR_ERR(sw); | |
1424 | } | |
1425 | *_sw = sw; | |
1426 | return 0; | |
1427 | } | |
1428 | ||
1429 | static | |
1430 | void _ltt_wildcard_destroy(struct session_wildcard *sw) | |
1431 | { | |
1432 | _remove_wildcard(sw); | |
1433 | } | |
1434 | ||
1435 | int ltt_wildcard_enable(struct session_wildcard *wildcard) | |
1436 | { | |
1437 | struct ltt_event *ev; | |
1438 | int ret; | |
1439 | ||
1440 | if (wildcard->enabled) | |
1441 | return -EEXIST; | |
1442 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1443 | ret = ltt_event_enable(ev); | |
1444 | if (ret) { | |
1445 | DBG("Error: enable error.\n"); | |
1446 | return ret; | |
1447 | } | |
1448 | } | |
1449 | wildcard->enabled = 1; | |
1450 | return 0; | |
1451 | } | |
1452 | ||
1453 | int ltt_wildcard_disable(struct session_wildcard *wildcard) | |
1454 | { | |
1455 | struct ltt_event *ev; | |
1456 | int ret; | |
1457 | ||
1458 | if (!wildcard->enabled) | |
1459 | return -EEXIST; | |
1460 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1461 | ret = ltt_event_disable(ev); | |
1462 | if (ret) { | |
1463 | DBG("Error: disable error.\n"); | |
1464 | return ret; | |
1465 | } | |
1466 | } | |
1467 | wildcard->enabled = 0; | |
1468 | return 0; | |
1469 | } | |
eddd8d5d MD |
1470 | |
1471 | /* | |
1472 | * Take the TLS "fault" in libuuid if dlopen'd, which can take the | |
1473 | * dynamic linker mutex, outside of the UST lock, since the UST lock is | |
1474 | * taken in constructors, which are called with dynamic linker mutex | |
1475 | * held. | |
1476 | */ | |
1477 | void lttng_fixup_event_tls(void) | |
1478 | { | |
1479 | unsigned char uuid[37]; | |
1480 | ||
1481 | (void) uuid_generate(uuid); | |
1482 | } |