Commit | Line | Data |
---|---|---|
8020ceb5 MD |
1 | /* |
2 | * ltt-events.c | |
3 | * | |
4 | * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * | |
6 | * Holds LTTng per-session event registry. | |
7 | * | |
8 | * Dual LGPL v2.1/GPL v2 license. | |
9 | */ | |
10 | ||
b5234c06 MD |
11 | #define _GNU_SOURCE |
12 | #include <stdio.h> | |
8a98a75d | 13 | #include <endian.h> |
b5234c06 | 14 | #include <urcu/list.h> |
8165c8da | 15 | #include <urcu/hlist.h> |
b5234c06 | 16 | #include <pthread.h> |
b5234c06 | 17 | #include <uuid/uuid.h> |
b5234c06 | 18 | #include <errno.h> |
f4681817 MD |
19 | #include <sys/shm.h> |
20 | #include <sys/ipc.h> | |
44c72f10 MD |
21 | #include <stdint.h> |
22 | #include <stddef.h> | |
28b12049 MD |
23 | #include <inttypes.h> |
24 | #include <time.h> | |
25 | #include "clock.h" | |
44c72f10 MD |
26 | |
27 | #include <urcu-bp.h> | |
28 | #include <urcu/compiler.h> | |
29 | #include <urcu/uatomic.h> | |
30 | #include <urcu/arch.h> | |
31 | ||
32 | #include <lttng/tracepoint.h> | |
4318ae1b | 33 | #include <lttng/ust-events.h> |
44c72f10 MD |
34 | |
35 | #include <usterr-signal-safe.h> | |
36 | #include <helper.h> | |
1f18504e | 37 | #include "error.h" |
44c72f10 | 38 | |
457a6b58 | 39 | #include "tracepoint-internal.h" |
8020ceb5 | 40 | #include "ltt-tracer.h" |
8165c8da | 41 | #include "ltt-tracer-core.h" |
b728d87e | 42 | #include "wait.h" |
8d8a24c8 | 43 | #include "../libringbuffer/shm.h" |
596c4223 | 44 | #include "jhash.h" |
8165c8da MD |
45 | |
46 | /* | |
47 | * The sessions mutex is the centralized mutex across UST tracing | |
17dfb34b MD |
48 | * control and probe registration. All operations within this file are |
49 | * called by the communication thread, under ust_lock protection. | |
8165c8da | 50 | */ |
2b2d6ff7 | 51 | static pthread_mutex_t sessions_mutex = PTHREAD_MUTEX_INITIALIZER; |
8165c8da | 52 | |
17dfb34b | 53 | void ust_lock(void) |
8165c8da MD |
54 | { |
55 | pthread_mutex_lock(&sessions_mutex); | |
56 | } | |
57 | ||
17dfb34b | 58 | void ust_unlock(void) |
8165c8da MD |
59 | { |
60 | pthread_mutex_unlock(&sessions_mutex); | |
61 | } | |
62 | ||
b5234c06 | 63 | static CDS_LIST_HEAD(sessions); |
8165c8da | 64 | |
457a6b58 MD |
65 | /* |
66 | * Wildcard list, containing the active wildcards. | |
67 | * Protected by ust lock. | |
68 | */ | |
69 | static CDS_LIST_HEAD(wildcard_list); | |
70 | ||
8165c8da MD |
71 | /* |
72 | * Pending probes hash table, containing the registered ltt events for | |
73 | * which tracepoint probes are still missing. Protected by the sessions | |
74 | * mutex. | |
75 | */ | |
76 | #define PENDING_PROBE_HASH_BITS 6 | |
77 | #define PENDING_PROBE_HASH_SIZE (1 << PENDING_PROBE_HASH_BITS) | |
78 | static struct cds_hlist_head pending_probe_table[PENDING_PROBE_HASH_SIZE]; | |
79 | ||
80 | struct ust_pending_probe { | |
81 | struct ltt_event *event; | |
82 | struct cds_hlist_node node; | |
457a6b58 MD |
83 | enum lttng_ust_loglevel_type loglevel_type; |
84 | int loglevel; | |
8165c8da MD |
85 | char name[]; |
86 | }; | |
8020ceb5 MD |
87 | |
88 | static void _ltt_event_destroy(struct ltt_event *event); | |
e6c12e3d | 89 | static void _ltt_wildcard_destroy(struct session_wildcard *sw); |
8020ceb5 MD |
90 | static void _ltt_channel_destroy(struct ltt_channel *chan); |
91 | static int _ltt_event_unregister(struct ltt_event *event); | |
92 | static | |
93 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
94 | struct ltt_channel *chan, | |
95 | struct ltt_event *event); | |
96 | static | |
97 | int _ltt_session_metadata_statedump(struct ltt_session *session); | |
98 | ||
457a6b58 MD |
99 | int ltt_loglevel_match(const struct lttng_event_desc *desc, |
100 | enum lttng_ust_loglevel_type req_type, | |
101 | int req_loglevel) | |
102 | { | |
103 | int ev_loglevel; | |
104 | ||
105 | if (req_type == LTTNG_UST_LOGLEVEL_ALL) | |
106 | return 1; | |
107 | if (!desc->loglevel) | |
108 | ev_loglevel = TRACE_DEFAULT; | |
109 | else | |
110 | ev_loglevel = *(*desc->loglevel); | |
111 | switch (req_type) { | |
112 | case LTTNG_UST_LOGLEVEL_RANGE: | |
113 | if (ev_loglevel <= req_loglevel || req_loglevel == -1) | |
114 | return 1; | |
115 | else | |
116 | return 0; | |
117 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
118 | if (ev_loglevel == req_loglevel || req_loglevel == -1) | |
119 | return 1; | |
120 | else | |
121 | return 0; | |
122 | case LTTNG_UST_LOGLEVEL_ALL: | |
123 | default: | |
124 | return 1; | |
125 | } | |
126 | } | |
127 | ||
128 | /* | |
129 | * Return wildcard for a given event name if the event name match the | |
130 | * one of the wildcards. | |
131 | * Must be called with ust lock held. | |
132 | * Returns NULL if not present. | |
133 | */ | |
134 | static | |
135 | struct wildcard_entry *match_wildcard(const struct lttng_event_desc *desc) | |
136 | { | |
137 | struct wildcard_entry *e; | |
138 | ||
139 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
140 | /* If only contain '*' */ | |
141 | if (strlen(e->name) == 1) | |
142 | goto possible_match; | |
143 | /* Compare excluding final '*' */ | |
144 | if (!strncmp(desc->name, e->name, strlen(e->name) - 1)) | |
145 | goto possible_match; | |
146 | continue; /* goto next, no match */ | |
147 | possible_match: | |
148 | if (ltt_loglevel_match(desc, | |
149 | e->loglevel_type, | |
150 | e->loglevel)) { | |
151 | return e; | |
152 | } | |
153 | /* no match, loop to next */ | |
154 | } | |
155 | return NULL; | |
156 | } | |
157 | ||
8165c8da MD |
158 | /* |
159 | * called at event creation if probe is missing. | |
160 | * called with session mutex held. | |
161 | */ | |
162 | static | |
457a6b58 MD |
163 | int add_pending_probe(struct ltt_event *event, const char *name, |
164 | enum lttng_ust_loglevel_type loglevel_type, | |
165 | int loglevel) | |
8165c8da MD |
166 | { |
167 | struct cds_hlist_head *head; | |
8165c8da | 168 | struct ust_pending_probe *e; |
ff412fb5 MD |
169 | size_t name_len = strlen(name); |
170 | uint32_t hash; | |
8165c8da | 171 | |
ff412fb5 MD |
172 | if (name_len > LTTNG_UST_SYM_NAME_LEN - 1) { |
173 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN - 1); | |
174 | name_len = LTTNG_UST_SYM_NAME_LEN - 1; | |
175 | } | |
176 | hash = jhash(name, name_len, 0); | |
8165c8da MD |
177 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
178 | e = zmalloc(sizeof(struct ust_pending_probe) + name_len); | |
179 | if (!e) | |
180 | return -ENOMEM; | |
ff412fb5 MD |
181 | memcpy(&e->name[0], name, name_len + 1); |
182 | e->name[name_len] = '\0'; | |
457a6b58 MD |
183 | e->loglevel_type = loglevel_type; |
184 | e->loglevel = loglevel; | |
8165c8da MD |
185 | cds_hlist_add_head(&e->node, head); |
186 | e->event = event; | |
187 | event->pending_probe = e; | |
188 | return 0; | |
189 | } | |
190 | ||
191 | /* | |
192 | * remove a pending probe. called when at event teardown and when an | |
193 | * event is fixed (probe is loaded). | |
194 | * called with session mutex held. | |
195 | */ | |
196 | static | |
197 | void remove_pending_probe(struct ust_pending_probe *e) | |
198 | { | |
199 | if (!e) | |
200 | return; | |
201 | cds_hlist_del(&e->node); | |
202 | free(e); | |
203 | } | |
204 | ||
205 | /* | |
206 | * Called at library load: connect the probe on the events pending on | |
207 | * probe load. | |
208 | * called with session mutex held. | |
209 | */ | |
210 | int pending_probe_fix_events(const struct lttng_event_desc *desc) | |
211 | { | |
212 | struct cds_hlist_head *head; | |
213 | struct cds_hlist_node *node, *p; | |
214 | struct ust_pending_probe *e; | |
215 | const char *name = desc->name; | |
8165c8da | 216 | int ret = 0; |
7ee3cc56 | 217 | struct lttng_ust_event event_param; |
ff412fb5 MD |
218 | size_t name_len = strlen(name); |
219 | uint32_t hash; | |
8165c8da | 220 | |
e6c12e3d MD |
221 | /* Wildcard */ |
222 | { | |
223 | struct wildcard_entry *wildcard; | |
224 | ||
457a6b58 | 225 | wildcard = match_wildcard(desc); |
e6c12e3d MD |
226 | if (strcmp(desc->name, "lttng_ust:metadata") && wildcard) { |
227 | struct session_wildcard *sw; | |
228 | ||
229 | cds_list_for_each_entry(sw, &wildcard->session_list, | |
230 | session_list) { | |
231 | struct ltt_event *ev; | |
232 | int ret; | |
233 | ||
234 | memcpy(&event_param, &sw->event_param, | |
235 | sizeof(event_param)); | |
236 | memcpy(event_param.name, | |
237 | desc->name, | |
238 | sizeof(event_param.name)); | |
239 | /* create event */ | |
240 | ret = ltt_event_create(sw->chan, | |
241 | &event_param, NULL, | |
242 | &ev); | |
243 | if (ret) { | |
244 | DBG("Error creating event"); | |
245 | continue; | |
246 | } | |
247 | cds_list_add(&ev->wildcard_list, | |
248 | &sw->events); | |
249 | } | |
250 | } | |
251 | } | |
252 | ||
ff412fb5 MD |
253 | if (name_len > LTTNG_UST_SYM_NAME_LEN - 1) { |
254 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN - 1); | |
255 | name_len = LTTNG_UST_SYM_NAME_LEN - 1; | |
256 | } | |
257 | hash = jhash(name, name_len, 0); | |
8165c8da MD |
258 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
259 | cds_hlist_for_each_entry_safe(e, node, p, head, node) { | |
260 | struct ltt_event *event; | |
261 | struct ltt_channel *chan; | |
262 | ||
8165c8da | 263 | event = e->event; |
457a6b58 MD |
264 | if (!ltt_loglevel_match(event->desc, |
265 | e->loglevel_type, | |
266 | e->loglevel)) { | |
267 | continue; | |
268 | } | |
269 | if (strncmp(name, e->name, LTTNG_UST_SYM_NAME_LEN - 1)) { | |
270 | continue; | |
271 | } | |
8165c8da MD |
272 | chan = event->chan; |
273 | assert(!event->desc); | |
274 | event->desc = desc; | |
275 | event->pending_probe = NULL; | |
276 | remove_pending_probe(e); | |
277 | ret |= __tracepoint_probe_register(name, | |
278 | event->desc->probe_callback, | |
279 | event); | |
636c5aa4 MD |
280 | if (ret) |
281 | continue; | |
282 | event->id = chan->free_event_id++; | |
8165c8da MD |
283 | ret |= _ltt_event_metadata_statedump(chan->session, chan, |
284 | event); | |
285 | } | |
286 | return ret; | |
287 | } | |
288 | ||
8020ceb5 MD |
289 | void synchronize_trace(void) |
290 | { | |
8020ceb5 | 291 | synchronize_rcu(); |
8020ceb5 MD |
292 | } |
293 | ||
294 | struct ltt_session *ltt_session_create(void) | |
295 | { | |
296 | struct ltt_session *session; | |
297 | ||
b5234c06 | 298 | session = zmalloc(sizeof(struct ltt_session)); |
8020ceb5 MD |
299 | if (!session) |
300 | return NULL; | |
b5234c06 MD |
301 | CDS_INIT_LIST_HEAD(&session->chan); |
302 | CDS_INIT_LIST_HEAD(&session->events); | |
e6c12e3d | 303 | CDS_INIT_LIST_HEAD(&session->wildcards); |
b5234c06 MD |
304 | uuid_generate(session->uuid); |
305 | cds_list_add(&session->list, &sessions); | |
8020ceb5 MD |
306 | return session; |
307 | } | |
308 | ||
309 | void ltt_session_destroy(struct ltt_session *session) | |
310 | { | |
311 | struct ltt_channel *chan, *tmpchan; | |
312 | struct ltt_event *event, *tmpevent; | |
e6c12e3d | 313 | struct session_wildcard *wildcard, *tmpwildcard; |
8020ceb5 MD |
314 | int ret; |
315 | ||
b5234c06 MD |
316 | CMM_ACCESS_ONCE(session->active) = 0; |
317 | cds_list_for_each_entry(event, &session->events, list) { | |
8020ceb5 MD |
318 | ret = _ltt_event_unregister(event); |
319 | WARN_ON(ret); | |
320 | } | |
321 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e6c12e3d MD |
322 | cds_list_for_each_entry_safe(wildcard, tmpwildcard, &session->wildcards, list) |
323 | _ltt_wildcard_destroy(wildcard); | |
b5234c06 | 324 | cds_list_for_each_entry_safe(event, tmpevent, &session->events, list) |
8020ceb5 | 325 | _ltt_event_destroy(event); |
b5234c06 | 326 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list) |
8020ceb5 | 327 | _ltt_channel_destroy(chan); |
b5234c06 | 328 | cds_list_del(&session->list); |
b5234c06 | 329 | free(session); |
8020ceb5 MD |
330 | } |
331 | ||
976fe9ea | 332 | int ltt_session_enable(struct ltt_session *session) |
8020ceb5 MD |
333 | { |
334 | int ret = 0; | |
335 | struct ltt_channel *chan; | |
336 | ||
8020ceb5 MD |
337 | if (session->active) { |
338 | ret = -EBUSY; | |
339 | goto end; | |
340 | } | |
341 | ||
342 | /* | |
343 | * Snapshot the number of events per channel to know the type of header | |
344 | * we need to use. | |
345 | */ | |
b5234c06 | 346 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
347 | if (chan->header_type) |
348 | continue; /* don't change it if session stop/restart */ | |
349 | if (chan->free_event_id < 31) | |
350 | chan->header_type = 1; /* compact */ | |
351 | else | |
352 | chan->header_type = 2; /* large */ | |
353 | } | |
354 | ||
b5234c06 MD |
355 | CMM_ACCESS_ONCE(session->active) = 1; |
356 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
8020ceb5 | 357 | ret = _ltt_session_metadata_statedump(session); |
4b4de73e | 358 | if (ret) |
b5234c06 | 359 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 360 | end: |
8020ceb5 MD |
361 | return ret; |
362 | } | |
363 | ||
976fe9ea | 364 | int ltt_session_disable(struct ltt_session *session) |
8020ceb5 MD |
365 | { |
366 | int ret = 0; | |
367 | ||
8020ceb5 MD |
368 | if (!session->active) { |
369 | ret = -EBUSY; | |
370 | goto end; | |
371 | } | |
b5234c06 | 372 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 373 | end: |
8020ceb5 MD |
374 | return ret; |
375 | } | |
376 | ||
976fe9ea MD |
377 | int ltt_channel_enable(struct ltt_channel *channel) |
378 | { | |
379 | int old; | |
380 | ||
9beb36ba MD |
381 | if (channel == channel->session->metadata) |
382 | return -EPERM; | |
b5234c06 | 383 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
384 | if (old) |
385 | return -EEXIST; | |
386 | return 0; | |
387 | } | |
388 | ||
389 | int ltt_channel_disable(struct ltt_channel *channel) | |
390 | { | |
391 | int old; | |
392 | ||
9beb36ba MD |
393 | if (channel == channel->session->metadata) |
394 | return -EPERM; | |
b5234c06 | 395 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
396 | if (!old) |
397 | return -EEXIST; | |
398 | return 0; | |
399 | } | |
400 | ||
401 | int ltt_event_enable(struct ltt_event *event) | |
402 | { | |
403 | int old; | |
404 | ||
9beb36ba MD |
405 | if (event->chan == event->chan->session->metadata) |
406 | return -EPERM; | |
b5234c06 | 407 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
408 | if (old) |
409 | return -EEXIST; | |
410 | return 0; | |
411 | } | |
412 | ||
413 | int ltt_event_disable(struct ltt_event *event) | |
414 | { | |
415 | int old; | |
416 | ||
9beb36ba MD |
417 | if (event->chan == event->chan->session->metadata) |
418 | return -EPERM; | |
b5234c06 | 419 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
420 | if (!old) |
421 | return -EEXIST; | |
422 | return 0; | |
423 | } | |
424 | ||
8020ceb5 MD |
425 | struct ltt_channel *ltt_channel_create(struct ltt_session *session, |
426 | const char *transport_name, | |
427 | void *buf_addr, | |
428 | size_t subbuf_size, size_t num_subbuf, | |
429 | unsigned int switch_timer_interval, | |
193183fb | 430 | unsigned int read_timer_interval, |
ef9ff354 MD |
431 | int **shm_fd, int **wait_fd, |
432 | uint64_t **memory_map_size, | |
d028eddb | 433 | struct ltt_channel *chan_priv_init) |
8020ceb5 | 434 | { |
a3f61e7f | 435 | struct ltt_channel *chan = NULL; |
8020ceb5 MD |
436 | struct ltt_transport *transport; |
437 | ||
8020ceb5 MD |
438 | if (session->been_active) |
439 | goto active; /* Refuse to add channel to active session */ | |
440 | transport = ltt_transport_find(transport_name); | |
441 | if (!transport) { | |
b5234c06 | 442 | DBG("LTTng transport %s not found\n", |
8020ceb5 MD |
443 | transport_name); |
444 | goto notransport; | |
445 | } | |
d028eddb MD |
446 | chan_priv_init->id = session->free_chan_id++; |
447 | chan_priv_init->session = session; | |
8020ceb5 MD |
448 | /* |
449 | * Note: the channel creation op already writes into the packet | |
450 | * headers. Therefore the "chan" information used as input | |
451 | * should be already accessible. | |
452 | */ | |
a3f61e7f | 453 | chan = transport->ops.channel_create("[lttng]", buf_addr, |
8020ceb5 | 454 | subbuf_size, num_subbuf, switch_timer_interval, |
193183fb | 455 | read_timer_interval, shm_fd, wait_fd, |
d028eddb | 456 | memory_map_size, chan_priv_init); |
a3f61e7f | 457 | if (!chan) |
8020ceb5 | 458 | goto create_error; |
976fe9ea | 459 | chan->enabled = 1; |
8020ceb5 | 460 | chan->ops = &transport->ops; |
b5234c06 | 461 | cds_list_add(&chan->list, &session->chan); |
8020ceb5 MD |
462 | return chan; |
463 | ||
464 | create_error: | |
8020ceb5 MD |
465 | notransport: |
466 | active: | |
8020ceb5 MD |
467 | return NULL; |
468 | } | |
469 | ||
470 | /* | |
471 | * Only used internally at session destruction. | |
472 | */ | |
473 | static | |
474 | void _ltt_channel_destroy(struct ltt_channel *chan) | |
475 | { | |
b5234c06 | 476 | cds_list_del(&chan->list); |
8020ceb5 | 477 | lttng_destroy_context(chan->ctx); |
a3f61e7f | 478 | chan->ops->channel_destroy(chan); |
8020ceb5 MD |
479 | } |
480 | ||
481 | /* | |
482 | * Supports event creation while tracing session is active. | |
483 | */ | |
576599a0 MD |
484 | int ltt_event_create(struct ltt_channel *chan, |
485 | struct lttng_ust_event *event_param, | |
486 | void *filter, | |
487 | struct ltt_event **_event) | |
8020ceb5 | 488 | { |
457a6b58 | 489 | const struct lttng_event_desc *desc = NULL; /* silence gcc */ |
8020ceb5 | 490 | struct ltt_event *event; |
576599a0 | 491 | int ret = 0; |
8020ceb5 | 492 | |
576599a0 MD |
493 | if (chan->used_event_id == -1UL) { |
494 | ret = -ENOMEM; | |
8020ceb5 | 495 | goto full; |
576599a0 | 496 | } |
8020ceb5 MD |
497 | /* |
498 | * This is O(n^2) (for each event, the loop is called at event | |
499 | * creation). Might require a hash if we have lots of events. | |
500 | */ | |
576599a0 | 501 | cds_list_for_each_entry(event, &chan->session->events, list) { |
ff412fb5 MD |
502 | if (event->desc && !strncmp(event->desc->name, |
503 | event_param->name, | |
504 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
576599a0 | 505 | ret = -EEXIST; |
8020ceb5 | 506 | goto exist; |
576599a0 MD |
507 | } |
508 | } | |
457a6b58 MD |
509 | |
510 | /* | |
511 | * Check if loglevel match. Refuse to connect event if not. | |
512 | */ | |
513 | if (event_param->instrumentation == LTTNG_UST_TRACEPOINT) { | |
514 | desc = ltt_event_get(event_param->name); | |
515 | if (!ltt_loglevel_match(desc, | |
516 | event_param->loglevel_type, | |
517 | event_param->loglevel)) { | |
518 | ret = -EPERM; | |
519 | goto no_loglevel_match; | |
520 | } | |
521 | } | |
b5234c06 | 522 | event = zmalloc(sizeof(struct ltt_event)); |
576599a0 MD |
523 | if (!event) { |
524 | ret = -ENOMEM; | |
8020ceb5 | 525 | goto cache_error; |
576599a0 | 526 | } |
8020ceb5 MD |
527 | event->chan = chan; |
528 | event->filter = filter; | |
8165c8da MD |
529 | /* |
530 | * used_event_id counts the maximum number of event IDs that can | |
531 | * register if all probes register. | |
532 | */ | |
533 | chan->used_event_id++; | |
976fe9ea | 534 | event->enabled = 1; |
8020ceb5 MD |
535 | event->instrumentation = event_param->instrumentation; |
536 | /* Populate ltt_event structure before tracepoint registration. */ | |
b5234c06 | 537 | cmm_smp_wmb(); |
8020ceb5 | 538 | switch (event_param->instrumentation) { |
b5234c06 | 539 | case LTTNG_UST_TRACEPOINT: |
457a6b58 | 540 | event->desc = desc; |
8165c8da MD |
541 | if (event->desc) { |
542 | ret = __tracepoint_probe_register(event_param->name, | |
543 | event->desc->probe_callback, | |
544 | event); | |
545 | if (ret) | |
546 | goto register_error; | |
547 | event->id = chan->free_event_id++; | |
548 | } else { | |
549 | /* | |
550 | * If the probe is not present, event->desc stays NULL, | |
551 | * waiting for the probe to register, and the event->id | |
552 | * stays unallocated. | |
553 | */ | |
457a6b58 MD |
554 | ret = add_pending_probe(event, event_param->name, |
555 | event_param->loglevel_type, | |
556 | event_param->loglevel); | |
8165c8da MD |
557 | if (ret) |
558 | goto add_pending_error; | |
559 | } | |
8020ceb5 | 560 | break; |
8020ceb5 MD |
561 | default: |
562 | WARN_ON_ONCE(1); | |
563 | } | |
8165c8da MD |
564 | if (event->desc) { |
565 | ret = _ltt_event_metadata_statedump(chan->session, chan, event); | |
566 | if (ret) | |
567 | goto statedump_error; | |
568 | } | |
b5234c06 | 569 | cds_list_add(&event->list, &chan->session->events); |
576599a0 MD |
570 | *_event = event; |
571 | return 0; | |
8020ceb5 MD |
572 | |
573 | statedump_error: | |
8165c8da MD |
574 | if (event->desc) { |
575 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_param->name, | |
576 | event->desc->probe_callback, | |
577 | event)); | |
578 | ltt_event_put(event->desc); | |
579 | } | |
580 | add_pending_error: | |
8020ceb5 | 581 | register_error: |
b5234c06 | 582 | free(event); |
8020ceb5 | 583 | cache_error: |
457a6b58 | 584 | no_loglevel_match: |
8020ceb5 MD |
585 | exist: |
586 | full: | |
576599a0 | 587 | return ret; |
8020ceb5 MD |
588 | } |
589 | ||
590 | /* | |
591 | * Only used internally at session destruction. | |
592 | */ | |
593 | int _ltt_event_unregister(struct ltt_event *event) | |
594 | { | |
595 | int ret = -EINVAL; | |
596 | ||
597 | switch (event->instrumentation) { | |
b5234c06 | 598 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
599 | if (event->desc) { |
600 | ret = __tracepoint_probe_unregister(event->desc->name, | |
601 | event->desc->probe_callback, | |
602 | event); | |
603 | if (ret) | |
604 | return ret; | |
605 | } else { | |
606 | remove_pending_probe(event->pending_probe); | |
607 | ret = 0; | |
608 | } | |
8020ceb5 | 609 | break; |
8020ceb5 MD |
610 | default: |
611 | WARN_ON_ONCE(1); | |
612 | } | |
613 | return ret; | |
614 | } | |
615 | ||
616 | /* | |
617 | * Only used internally at session destruction. | |
618 | */ | |
619 | static | |
620 | void _ltt_event_destroy(struct ltt_event *event) | |
621 | { | |
622 | switch (event->instrumentation) { | |
b5234c06 | 623 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
624 | if (event->desc) { |
625 | ltt_event_put(event->desc); | |
626 | } | |
8020ceb5 | 627 | break; |
8020ceb5 MD |
628 | default: |
629 | WARN_ON_ONCE(1); | |
630 | } | |
b5234c06 | 631 | cds_list_del(&event->list); |
8020ceb5 | 632 | lttng_destroy_context(event->ctx); |
b5234c06 | 633 | free(event); |
8020ceb5 MD |
634 | } |
635 | ||
636 | /* | |
637 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 638 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
639 | * remaining space left in packet and write, since mutual exclusion |
640 | * protects us from concurrent writes. | |
641 | */ | |
642 | int lttng_metadata_printf(struct ltt_session *session, | |
643 | const char *fmt, ...) | |
644 | { | |
4cfec15c | 645 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
8020ceb5 | 646 | struct ltt_channel *chan = session->metadata; |
b5234c06 | 647 | char *str = NULL; |
8020ceb5 MD |
648 | int ret = 0, waitret; |
649 | size_t len, reserve_len, pos; | |
650 | va_list ap; | |
651 | ||
b5234c06 | 652 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
653 | |
654 | va_start(ap, fmt); | |
b5234c06 | 655 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 656 | va_end(ap); |
b5234c06 | 657 | if (ret < 0) |
8020ceb5 MD |
658 | return -ENOMEM; |
659 | ||
660 | len = strlen(str); | |
661 | pos = 0; | |
662 | ||
663 | for (pos = 0; pos < len; pos += reserve_len) { | |
664 | reserve_len = min_t(size_t, | |
1d498196 | 665 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
666 | len - pos); |
667 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 668 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
669 | /* |
670 | * We don't care about metadata buffer's records lost | |
671 | * count, because we always retry here. Report error if | |
672 | * we need to bail out after timeout or being | |
673 | * interrupted. | |
674 | */ | |
b5234c06 | 675 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
676 | ({ |
677 | ret = chan->ops->event_reserve(&ctx, 0); | |
678 | ret != -ENOBUFS || !ret; | |
679 | }), | |
b5234c06 | 680 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 681 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
682 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
683 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 684 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 685 | if (waitret == -EINTR) |
8020ceb5 MD |
686 | ret = waitret; |
687 | goto end; | |
688 | } | |
689 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
690 | chan->ops->event_commit(&ctx); | |
691 | } | |
692 | end: | |
b5234c06 | 693 | free(str); |
8020ceb5 MD |
694 | return ret; |
695 | } | |
696 | ||
697 | static | |
698 | int _ltt_field_statedump(struct ltt_session *session, | |
699 | const struct lttng_event_field *field) | |
700 | { | |
701 | int ret = 0; | |
702 | ||
703 | switch (field->type.atype) { | |
704 | case atype_integer: | |
705 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 706 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
707 | field->type.u.basic.integer.size, |
708 | field->type.u.basic.integer.alignment, | |
709 | field->type.u.basic.integer.signedness, | |
710 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
711 | ? "none" | |
712 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
713 | ? "UTF8" | |
714 | : "ASCII", | |
715 | field->type.u.basic.integer.base, | |
8a98a75d | 716 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
717 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
718 | #else | |
719 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
720 | #endif | |
721 | field->name); | |
722 | break; | |
723 | case atype_float: | |
724 | ret = lttng_metadata_printf(session, | |
8a98a75d | 725 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
726 | field->type.u.basic._float.exp_dig, |
727 | field->type.u.basic._float.mant_dig, | |
728 | field->type.u.basic._float.alignment, | |
8a98a75d | 729 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
730 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
731 | #else | |
732 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
733 | #endif | |
734 | field->name); | |
735 | break; | |
736 | case atype_enum: | |
737 | ret = lttng_metadata_printf(session, | |
738 | " %s %s;\n", | |
739 | field->type.u.basic.enumeration.name, | |
740 | field->name); | |
741 | break; | |
742 | case atype_array: | |
743 | { | |
744 | const struct lttng_basic_type *elem_type; | |
745 | ||
746 | elem_type = &field->type.u.array.elem_type; | |
747 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 748 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
749 | elem_type->u.basic.integer.size, |
750 | elem_type->u.basic.integer.alignment, | |
751 | elem_type->u.basic.integer.signedness, | |
752 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
753 | ? "none" | |
754 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
755 | ? "UTF8" | |
756 | : "ASCII", | |
757 | elem_type->u.basic.integer.base, | |
8a98a75d | 758 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
759 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
760 | #else | |
761 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
762 | #endif | |
763 | field->name, field->type.u.array.length); | |
764 | break; | |
765 | } | |
766 | case atype_sequence: | |
767 | { | |
768 | const struct lttng_basic_type *elem_type; | |
769 | const struct lttng_basic_type *length_type; | |
770 | ||
771 | elem_type = &field->type.u.sequence.elem_type; | |
772 | length_type = &field->type.u.sequence.length_type; | |
773 | ret = lttng_metadata_printf(session, | |
774 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
775 | length_type->u.basic.integer.size, | |
776 | (unsigned int) length_type->u.basic.integer.alignment, | |
777 | length_type->u.basic.integer.signedness, | |
778 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
779 | ? "none" | |
780 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
781 | ? "UTF8" | |
782 | : "ASCII"), | |
783 | length_type->u.basic.integer.base, | |
8a98a75d | 784 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
785 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
786 | #else | |
787 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
788 | #endif | |
789 | field->name); | |
790 | if (ret) | |
791 | return ret; | |
792 | ||
793 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 794 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
795 | elem_type->u.basic.integer.size, |
796 | (unsigned int) elem_type->u.basic.integer.alignment, | |
797 | elem_type->u.basic.integer.signedness, | |
798 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
799 | ? "none" | |
800 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
801 | ? "UTF8" | |
802 | : "ASCII"), | |
803 | elem_type->u.basic.integer.base, | |
8a98a75d | 804 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
805 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
806 | #else | |
807 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
808 | #endif | |
809 | field->name, | |
810 | field->name); | |
811 | break; | |
812 | } | |
813 | ||
814 | case atype_string: | |
815 | /* Default encoding is UTF8 */ | |
816 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 817 | " string%s _%s;\n", |
8020ceb5 MD |
818 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
819 | " { encoding = ASCII; }" : "", | |
820 | field->name); | |
821 | break; | |
822 | default: | |
823 | WARN_ON_ONCE(1); | |
824 | return -EINVAL; | |
825 | } | |
826 | return ret; | |
827 | } | |
828 | ||
829 | static | |
830 | int _ltt_context_metadata_statedump(struct ltt_session *session, | |
831 | struct lttng_ctx *ctx) | |
832 | { | |
833 | int ret = 0; | |
834 | int i; | |
835 | ||
836 | if (!ctx) | |
837 | return 0; | |
838 | for (i = 0; i < ctx->nr_fields; i++) { | |
839 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
840 | ||
841 | ret = _ltt_field_statedump(session, &field->event_field); | |
842 | if (ret) | |
843 | return ret; | |
844 | } | |
845 | return ret; | |
846 | } | |
847 | ||
848 | static | |
849 | int _ltt_fields_metadata_statedump(struct ltt_session *session, | |
850 | struct ltt_event *event) | |
851 | { | |
852 | const struct lttng_event_desc *desc = event->desc; | |
853 | int ret = 0; | |
854 | int i; | |
855 | ||
856 | for (i = 0; i < desc->nr_fields; i++) { | |
857 | const struct lttng_event_field *field = &desc->fields[i]; | |
858 | ||
859 | ret = _ltt_field_statedump(session, field); | |
860 | if (ret) | |
861 | return ret; | |
862 | } | |
863 | return ret; | |
864 | } | |
865 | ||
866 | static | |
867 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
868 | struct ltt_channel *chan, | |
869 | struct ltt_event *event) | |
870 | { | |
871 | int ret = 0; | |
872 | ||
b5234c06 | 873 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
874 | return 0; |
875 | if (chan == session->metadata) | |
876 | return 0; | |
8165c8da MD |
877 | /* |
878 | * Don't print events for which probe load is pending. | |
879 | */ | |
880 | if (!event->desc) | |
881 | return 0; | |
8020ceb5 MD |
882 | |
883 | ret = lttng_metadata_printf(session, | |
884 | "event {\n" | |
7083f0fe | 885 | " name = \"%s\";\n" |
8020ceb5 MD |
886 | " id = %u;\n" |
887 | " stream_id = %u;\n", | |
888 | event->desc->name, | |
889 | event->id, | |
890 | event->chan->id); | |
891 | if (ret) | |
892 | goto end; | |
893 | ||
e6c12e3d | 894 | if (event->desc->loglevel) { |
e6c12e3d | 895 | ret = lttng_metadata_printf(session, |
882a56d7 | 896 | " loglevel = %d;\n", |
457a6b58 | 897 | *(*event->desc->loglevel)); |
e6c12e3d MD |
898 | if (ret) |
899 | goto end; | |
900 | } | |
901 | ||
8020ceb5 MD |
902 | if (event->ctx) { |
903 | ret = lttng_metadata_printf(session, | |
904 | " context := struct {\n"); | |
905 | if (ret) | |
906 | goto end; | |
907 | } | |
908 | ret = _ltt_context_metadata_statedump(session, event->ctx); | |
909 | if (ret) | |
910 | goto end; | |
911 | if (event->ctx) { | |
912 | ret = lttng_metadata_printf(session, | |
913 | " };\n"); | |
914 | if (ret) | |
915 | goto end; | |
916 | } | |
917 | ||
918 | ret = lttng_metadata_printf(session, | |
919 | " fields := struct {\n" | |
920 | ); | |
921 | if (ret) | |
922 | goto end; | |
923 | ||
924 | ret = _ltt_fields_metadata_statedump(session, event); | |
925 | if (ret) | |
926 | goto end; | |
927 | ||
928 | /* | |
929 | * LTTng space reservation can only reserve multiples of the | |
930 | * byte size. | |
931 | */ | |
932 | ret = lttng_metadata_printf(session, | |
933 | " };\n" | |
934 | "};\n\n"); | |
935 | if (ret) | |
936 | goto end; | |
937 | ||
938 | event->metadata_dumped = 1; | |
939 | end: | |
940 | return ret; | |
941 | ||
942 | } | |
943 | ||
944 | static | |
945 | int _ltt_channel_metadata_statedump(struct ltt_session *session, | |
946 | struct ltt_channel *chan) | |
947 | { | |
948 | int ret = 0; | |
949 | ||
b5234c06 | 950 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
951 | return 0; |
952 | if (chan == session->metadata) | |
953 | return 0; | |
954 | ||
955 | WARN_ON_ONCE(!chan->header_type); | |
956 | ret = lttng_metadata_printf(session, | |
957 | "stream {\n" | |
958 | " id = %u;\n" | |
959 | " event.header := %s;\n" | |
960 | " packet.context := struct packet_context;\n", | |
961 | chan->id, | |
962 | chan->header_type == 1 ? "struct event_header_compact" : | |
963 | "struct event_header_large"); | |
964 | if (ret) | |
965 | goto end; | |
966 | ||
967 | if (chan->ctx) { | |
968 | ret = lttng_metadata_printf(session, | |
969 | " event.context := struct {\n"); | |
970 | if (ret) | |
971 | goto end; | |
972 | } | |
973 | ret = _ltt_context_metadata_statedump(session, chan->ctx); | |
974 | if (ret) | |
975 | goto end; | |
976 | if (chan->ctx) { | |
977 | ret = lttng_metadata_printf(session, | |
978 | " };\n"); | |
979 | if (ret) | |
980 | goto end; | |
981 | } | |
982 | ||
983 | ret = lttng_metadata_printf(session, | |
984 | "};\n\n"); | |
985 | ||
986 | chan->metadata_dumped = 1; | |
987 | end: | |
988 | return ret; | |
989 | } | |
990 | ||
991 | static | |
992 | int _ltt_stream_packet_context_declare(struct ltt_session *session) | |
993 | { | |
994 | return lttng_metadata_printf(session, | |
995 | "struct packet_context {\n" | |
28b12049 MD |
996 | " uint64_clock_monotonic_t timestamp_begin;\n" |
997 | " uint64_clock_monotonic_t timestamp_end;\n" | |
8020ceb5 MD |
998 | " uint32_t events_discarded;\n" |
999 | " uint32_t content_size;\n" | |
1000 | " uint32_t packet_size;\n" | |
1001 | " uint32_t cpu_id;\n" | |
1002 | "};\n\n" | |
1003 | ); | |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * Compact header: | |
1008 | * id: range: 0 - 30. | |
1009 | * id 31 is reserved to indicate an extended header. | |
1010 | * | |
1011 | * Large header: | |
1012 | * id: range: 0 - 65534. | |
1013 | * id 65535 is reserved to indicate an extended header. | |
1014 | */ | |
1015 | static | |
1016 | int _ltt_event_header_declare(struct ltt_session *session) | |
1017 | { | |
1018 | return lttng_metadata_printf(session, | |
1019 | "struct event_header_compact {\n" | |
1020 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1021 | " variant <id> {\n" | |
1022 | " struct {\n" | |
28b12049 | 1023 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1024 | " } compact;\n" |
1025 | " struct {\n" | |
1026 | " uint32_t id;\n" | |
28b12049 | 1027 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1028 | " } extended;\n" |
1029 | " } v;\n" | |
1030 | "} align(%u);\n" | |
1031 | "\n" | |
1032 | "struct event_header_large {\n" | |
1033 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1034 | " variant <id> {\n" | |
1035 | " struct {\n" | |
28b12049 | 1036 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1037 | " } compact;\n" |
1038 | " struct {\n" | |
1039 | " uint32_t id;\n" | |
28b12049 | 1040 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1041 | " } extended;\n" |
1042 | " } v;\n" | |
1043 | "} align(%u);\n\n", | |
1dbfff0c MD |
1044 | lttng_alignof(uint32_t) * CHAR_BIT, |
1045 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1046 | ); |
1047 | } | |
1048 | ||
28b12049 MD |
1049 | /* |
1050 | * Approximation of NTP time of day to clock monotonic correlation, | |
1051 | * taken at start of trace. | |
1052 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1053 | * in future versions. | |
1054 | */ | |
1055 | static | |
1056 | uint64_t measure_clock_offset(void) | |
1057 | { | |
1058 | uint64_t offset, monotonic[2], realtime; | |
1059 | struct timespec rts = { 0, 0 }; | |
1060 | int ret; | |
1061 | ||
1062 | monotonic[0] = trace_clock_read64(); | |
1063 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1064 | if (ret < 0) | |
1065 | return 0; | |
1066 | monotonic[1] = trace_clock_read64(); | |
1067 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
1068 | realtime = rts.tv_sec * 1000000000ULL; | |
1069 | realtime += rts.tv_nsec; | |
1070 | offset = realtime - offset; | |
1071 | return offset; | |
1072 | } | |
1073 | ||
8020ceb5 MD |
1074 | /* |
1075 | * Output metadata into this session's metadata buffers. | |
1076 | */ | |
1077 | static | |
1078 | int _ltt_session_metadata_statedump(struct ltt_session *session) | |
1079 | { | |
b5234c06 | 1080 | unsigned char *uuid_c = session->uuid; |
939950af | 1081 | char uuid_s[37], clock_uuid_s[CLOCK_UUID_LEN]; |
8020ceb5 MD |
1082 | struct ltt_channel *chan; |
1083 | struct ltt_event *event; | |
1084 | int ret = 0; | |
1085 | ||
b5234c06 | 1086 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1087 | return 0; |
1088 | if (session->metadata_dumped) | |
1089 | goto skip_session; | |
1090 | if (!session->metadata) { | |
b5234c06 | 1091 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1092 | return -EPERM; |
1093 | } | |
1094 | ||
1095 | snprintf(uuid_s, sizeof(uuid_s), | |
1096 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1097 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1098 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1099 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1100 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1101 | ||
1102 | ret = lttng_metadata_printf(session, | |
1103 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1104 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1105 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1106 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
1107 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" | |
1108 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1109 | "\n" | |
1110 | "trace {\n" | |
1111 | " major = %u;\n" | |
1112 | " minor = %u;\n" | |
1113 | " uuid = \"%s\";\n" | |
1114 | " byte_order = %s;\n" | |
1115 | " packet.header := struct {\n" | |
1116 | " uint32_t magic;\n" | |
1117 | " uint8_t uuid[16];\n" | |
1118 | " uint32_t stream_id;\n" | |
1119 | " };\n" | |
1120 | "};\n\n", | |
1dbfff0c MD |
1121 | lttng_alignof(uint8_t) * CHAR_BIT, |
1122 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1123 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1124 | lttng_alignof(uint64_t) * CHAR_BIT, | |
8020ceb5 MD |
1125 | CTF_VERSION_MAJOR, |
1126 | CTF_VERSION_MINOR, | |
1127 | uuid_s, | |
8a98a75d | 1128 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1129 | "be" |
1130 | #else | |
1131 | "le" | |
1132 | #endif | |
1133 | ); | |
1134 | if (ret) | |
1135 | goto end; | |
1136 | ||
28b12049 MD |
1137 | ret = lttng_metadata_printf(session, |
1138 | "clock {\n" | |
939950af MD |
1139 | " name = %s;\n", |
1140 | "monotonic" | |
1141 | ); | |
1142 | if (ret) | |
1143 | goto end; | |
1144 | ||
1145 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1146 | ret = lttng_metadata_printf(session, | |
1147 | " uuid = \"%s\";\n", | |
1148 | clock_uuid_s | |
1149 | ); | |
1150 | if (ret) | |
1151 | goto end; | |
1152 | } | |
1153 | ||
1154 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1155 | " description = \"Monotonic Clock\";\n" |
1156 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1157 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1158 | " offset = %" PRIu64 ";\n" | |
1159 | "};\n\n", | |
28b12049 MD |
1160 | trace_clock_freq(), |
1161 | measure_clock_offset() | |
1162 | ); | |
1163 | if (ret) | |
1164 | goto end; | |
1165 | ||
1166 | ret = lttng_metadata_printf(session, | |
1167 | "typealias integer {\n" | |
1168 | " size = 27; align = 1; signed = false;\n" | |
1169 | " map = clock.monotonic.value;\n" | |
1170 | "} := uint27_clock_monotonic_t;\n" | |
1171 | "\n" | |
1172 | "typealias integer {\n" | |
1173 | " size = 32; align = %u; signed = false;\n" | |
1174 | " map = clock.monotonic.value;\n" | |
1175 | "} := uint32_clock_monotonic_t;\n" | |
1176 | "\n" | |
1177 | "typealias integer {\n" | |
1178 | " size = 64; align = %u; signed = false;\n" | |
1179 | " map = clock.monotonic.value;\n" | |
1180 | "} := uint64_clock_monotonic_t;\n\n", | |
1181 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1182 | lttng_alignof(uint64_t) * CHAR_BIT | |
1183 | ); | |
1184 | if (ret) | |
1185 | goto end; | |
1186 | ||
8020ceb5 MD |
1187 | ret = _ltt_stream_packet_context_declare(session); |
1188 | if (ret) | |
1189 | goto end; | |
1190 | ||
1191 | ret = _ltt_event_header_declare(session); | |
1192 | if (ret) | |
1193 | goto end; | |
1194 | ||
1195 | skip_session: | |
b5234c06 | 1196 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
1197 | ret = _ltt_channel_metadata_statedump(session, chan); |
1198 | if (ret) | |
1199 | goto end; | |
1200 | } | |
1201 | ||
b5234c06 | 1202 | cds_list_for_each_entry(event, &session->events, list) { |
8020ceb5 MD |
1203 | ret = _ltt_event_metadata_statedump(session, event->chan, event); |
1204 | if (ret) | |
1205 | goto end; | |
1206 | } | |
1207 | session->metadata_dumped = 1; | |
1208 | end: | |
1209 | return ret; | |
1210 | } | |
1211 | ||
003fedf4 | 1212 | void lttng_ust_events_exit(void) |
8020ceb5 MD |
1213 | { |
1214 | struct ltt_session *session, *tmpsession; | |
1215 | ||
b5234c06 | 1216 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, list) |
8020ceb5 | 1217 | ltt_session_destroy(session); |
8020ceb5 | 1218 | } |
457a6b58 MD |
1219 | |
1220 | /* WILDCARDS */ | |
1221 | ||
1222 | static | |
1223 | int wildcard_same_loglevel(struct wildcard_entry *e, | |
1224 | enum lttng_ust_loglevel_type loglevel_type, | |
1225 | int loglevel) | |
1226 | { | |
1227 | if (e->loglevel_type == loglevel_type && e->loglevel == loglevel) | |
1228 | return 1; | |
1229 | else | |
1230 | return 0; | |
1231 | } | |
1232 | ||
1233 | #if 0 | |
1234 | static | |
1235 | int wildcard_is_within(struct wildcard_entry *e, | |
1236 | enum lttng_ust_loglevel_type loglevel_type, | |
1237 | int loglevel) | |
1238 | { | |
1239 | if (e->loglevel_type == LTTNG_UST_LOGLEVEL_ALL | |
1240 | || e->loglevel == -1) | |
1241 | return 1; | |
1242 | switch (e->loglevel_type) { | |
1243 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1244 | switch (loglevel_type) { | |
1245 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1246 | if (e->loglevel >= loglevel) | |
1247 | return 1; | |
1248 | else | |
1249 | return 0; | |
1250 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1251 | if (e->loglevel <= 0 && loglevel == 0) | |
1252 | return 1; | |
1253 | else | |
1254 | return 0; | |
1255 | } | |
1256 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1257 | switch (loglevel_type) { | |
1258 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1259 | if (loglevel <= 0) | |
1260 | return 1; | |
1261 | else | |
1262 | return 0; | |
1263 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1264 | if (e->loglevel == loglevel) | |
1265 | return 1; | |
1266 | else | |
1267 | return 0; | |
1268 | } | |
1269 | } | |
1270 | } | |
1271 | #endif | |
1272 | ||
1273 | /* | |
1274 | * Add the wildcard to the wildcard list. Must be called with | |
1275 | * ust lock held. | |
1276 | */ | |
1277 | static | |
1278 | struct session_wildcard *add_wildcard(struct ltt_channel *chan, | |
1279 | struct lttng_ust_event *event_param) | |
1280 | { | |
1281 | struct wildcard_entry *e; | |
1282 | struct session_wildcard *sw; | |
1283 | size_t name_len = strlen(event_param->name) + 1; | |
1284 | int found = 0; | |
1285 | ||
1286 | /* | |
1287 | * Try to find global wildcard entry. Given that this is shared | |
1288 | * across all sessions, we need to check for exact loglevel | |
1289 | * match, not just whether contained within the existing ones. | |
1290 | */ | |
1291 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
1292 | if (!strncmp(event_param->name, e->name, | |
1293 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
1294 | if (wildcard_same_loglevel(e, | |
1295 | event_param->loglevel_type, | |
1296 | event_param->loglevel)) { | |
1297 | found = 1; | |
1298 | break; | |
1299 | } | |
1300 | } | |
1301 | } | |
1302 | ||
1303 | if (!found) { | |
1304 | /* | |
1305 | * Create global wildcard entry if not found. Using | |
1306 | * zmalloc here to allocate a variable length element. | |
1307 | * Could cause some memory fragmentation if overused. | |
1308 | */ | |
1309 | e = zmalloc(sizeof(struct wildcard_entry) + name_len); | |
1310 | if (!e) | |
1311 | return ERR_PTR(-ENOMEM); | |
1312 | memcpy(&e->name[0], event_param->name, name_len); | |
1313 | cds_list_add(&e->list, &wildcard_list); | |
1314 | CDS_INIT_LIST_HEAD(&e->session_list); | |
1315 | } | |
1316 | ||
1317 | /* session wildcard */ | |
1318 | cds_list_for_each_entry(sw, &e->session_list, session_list) { | |
1319 | if (chan == sw->chan) { | |
1320 | DBG("wildcard %s busy for this channel", | |
1321 | event_param->name); | |
1322 | return ERR_PTR(-EEXIST); /* Already there */ | |
1323 | } | |
1324 | } | |
1325 | sw = zmalloc(sizeof(struct session_wildcard)); | |
1326 | if (!sw) | |
1327 | return ERR_PTR(-ENOMEM); | |
1328 | sw->chan = chan; | |
1329 | sw->enabled = 1; | |
1330 | memcpy(&sw->event_param, event_param, sizeof(sw->event_param)); | |
1331 | sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT; | |
1332 | sw->event_param.loglevel_type = event_param->loglevel_type; | |
1333 | sw->event_param.loglevel = event_param->loglevel; | |
1334 | CDS_INIT_LIST_HEAD(&sw->events); | |
1335 | cds_list_add(&sw->list, &chan->session->wildcards); | |
1336 | cds_list_add(&sw->session_list, &e->session_list); | |
1337 | sw->entry = e; | |
1338 | ltt_probes_create_wildcard_events(e, sw); | |
1339 | return sw; | |
1340 | } | |
1341 | ||
1342 | /* | |
1343 | * Remove the wildcard from the wildcard list. Must be called with | |
1344 | * ust_lock held. Only called at session teardown. | |
1345 | */ | |
1346 | static | |
1347 | void _remove_wildcard(struct session_wildcard *wildcard) | |
1348 | { | |
1349 | struct ltt_event *ev, *tmp; | |
1350 | ||
1351 | /* | |
1352 | * Just remove the events owned (for enable/disable) by this | |
1353 | * wildcard from the list. The session teardown will take care | |
1354 | * of freeing the event memory. | |
1355 | */ | |
1356 | cds_list_for_each_entry_safe(ev, tmp, &wildcard->events, | |
1357 | wildcard_list) { | |
1358 | cds_list_del(&ev->wildcard_list); | |
1359 | } | |
1360 | cds_list_del(&wildcard->session_list); | |
1361 | cds_list_del(&wildcard->list); | |
1362 | if (cds_list_empty(&wildcard->entry->session_list)) { | |
1363 | cds_list_del(&wildcard->entry->list); | |
1364 | free(wildcard->entry); | |
1365 | } | |
1366 | free(wildcard); | |
1367 | } | |
1368 | ||
1369 | int ltt_wildcard_create(struct ltt_channel *chan, | |
1370 | struct lttng_ust_event *event_param, | |
1371 | struct session_wildcard **_sw) | |
1372 | { | |
1373 | struct session_wildcard *sw; | |
1374 | ||
1375 | sw = add_wildcard(chan, event_param); | |
1376 | if (!sw || IS_ERR(sw)) { | |
1377 | return PTR_ERR(sw); | |
1378 | } | |
1379 | *_sw = sw; | |
1380 | return 0; | |
1381 | } | |
1382 | ||
1383 | static | |
1384 | void _ltt_wildcard_destroy(struct session_wildcard *sw) | |
1385 | { | |
1386 | _remove_wildcard(sw); | |
1387 | } | |
1388 | ||
1389 | int ltt_wildcard_enable(struct session_wildcard *wildcard) | |
1390 | { | |
1391 | struct ltt_event *ev; | |
1392 | int ret; | |
1393 | ||
1394 | if (wildcard->enabled) | |
1395 | return -EEXIST; | |
1396 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1397 | ret = ltt_event_enable(ev); | |
1398 | if (ret) { | |
1399 | DBG("Error: enable error.\n"); | |
1400 | return ret; | |
1401 | } | |
1402 | } | |
1403 | wildcard->enabled = 1; | |
1404 | return 0; | |
1405 | } | |
1406 | ||
1407 | int ltt_wildcard_disable(struct session_wildcard *wildcard) | |
1408 | { | |
1409 | struct ltt_event *ev; | |
1410 | int ret; | |
1411 | ||
1412 | if (!wildcard->enabled) | |
1413 | return -EEXIST; | |
1414 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1415 | ret = ltt_event_disable(ev); | |
1416 | if (ret) { | |
1417 | DBG("Error: disable error.\n"); | |
1418 | return ret; | |
1419 | } | |
1420 | } | |
1421 | wildcard->enabled = 0; | |
1422 | return 0; | |
1423 | } |