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> | |
13 | #include <urcu/list.h> | |
8165c8da | 14 | #include <urcu/hlist.h> |
b5234c06 | 15 | #include <pthread.h> |
b5234c06 | 16 | #include <uuid/uuid.h> |
b5234c06 | 17 | #include <errno.h> |
f4681817 MD |
18 | #include <sys/shm.h> |
19 | #include <sys/ipc.h> | |
44c72f10 MD |
20 | #include <stdint.h> |
21 | #include <stddef.h> | |
28b12049 MD |
22 | #include <inttypes.h> |
23 | #include <time.h> | |
8740da0a | 24 | #include <lttng/ust-endian.h> |
28b12049 | 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" |
48621a42 | 38 | #include "compat.h" |
44c72f10 | 39 | |
457a6b58 | 40 | #include "tracepoint-internal.h" |
8020ceb5 | 41 | #include "ltt-tracer.h" |
8165c8da | 42 | #include "ltt-tracer-core.h" |
b728d87e | 43 | #include "wait.h" |
8d8a24c8 | 44 | #include "../libringbuffer/shm.h" |
596c4223 | 45 | #include "jhash.h" |
8165c8da MD |
46 | |
47 | /* | |
48 | * The sessions mutex is the centralized mutex across UST tracing | |
17dfb34b MD |
49 | * control and probe registration. All operations within this file are |
50 | * called by the communication thread, under ust_lock protection. | |
8165c8da | 51 | */ |
2b2d6ff7 | 52 | static pthread_mutex_t sessions_mutex = PTHREAD_MUTEX_INITIALIZER; |
8165c8da | 53 | |
17dfb34b | 54 | void ust_lock(void) |
8165c8da MD |
55 | { |
56 | pthread_mutex_lock(&sessions_mutex); | |
57 | } | |
58 | ||
17dfb34b | 59 | void ust_unlock(void) |
8165c8da MD |
60 | { |
61 | pthread_mutex_unlock(&sessions_mutex); | |
62 | } | |
63 | ||
b5234c06 | 64 | static CDS_LIST_HEAD(sessions); |
8165c8da | 65 | |
457a6b58 MD |
66 | /* |
67 | * Wildcard list, containing the active wildcards. | |
68 | * Protected by ust lock. | |
69 | */ | |
70 | static CDS_LIST_HEAD(wildcard_list); | |
71 | ||
8165c8da MD |
72 | /* |
73 | * Pending probes hash table, containing the registered ltt events for | |
74 | * which tracepoint probes are still missing. Protected by the sessions | |
75 | * mutex. | |
76 | */ | |
77 | #define PENDING_PROBE_HASH_BITS 6 | |
78 | #define PENDING_PROBE_HASH_SIZE (1 << PENDING_PROBE_HASH_BITS) | |
79 | static struct cds_hlist_head pending_probe_table[PENDING_PROBE_HASH_SIZE]; | |
80 | ||
81 | struct ust_pending_probe { | |
82 | struct ltt_event *event; | |
83 | struct cds_hlist_node node; | |
457a6b58 MD |
84 | enum lttng_ust_loglevel_type loglevel_type; |
85 | int loglevel; | |
8165c8da MD |
86 | char name[]; |
87 | }; | |
8020ceb5 MD |
88 | |
89 | static void _ltt_event_destroy(struct ltt_event *event); | |
e6c12e3d | 90 | static void _ltt_wildcard_destroy(struct session_wildcard *sw); |
8020ceb5 MD |
91 | static void _ltt_channel_destroy(struct ltt_channel *chan); |
92 | static int _ltt_event_unregister(struct ltt_event *event); | |
93 | static | |
94 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
95 | struct ltt_channel *chan, | |
96 | struct ltt_event *event); | |
97 | static | |
98 | int _ltt_session_metadata_statedump(struct ltt_session *session); | |
99 | ||
457a6b58 MD |
100 | int ltt_loglevel_match(const struct lttng_event_desc *desc, |
101 | enum lttng_ust_loglevel_type req_type, | |
102 | int req_loglevel) | |
103 | { | |
104 | int ev_loglevel; | |
105 | ||
106 | if (req_type == LTTNG_UST_LOGLEVEL_ALL) | |
107 | return 1; | |
108 | if (!desc->loglevel) | |
109 | ev_loglevel = TRACE_DEFAULT; | |
110 | else | |
111 | ev_loglevel = *(*desc->loglevel); | |
112 | switch (req_type) { | |
113 | case LTTNG_UST_LOGLEVEL_RANGE: | |
114 | if (ev_loglevel <= req_loglevel || req_loglevel == -1) | |
115 | return 1; | |
116 | else | |
117 | return 0; | |
118 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
119 | if (ev_loglevel == req_loglevel || req_loglevel == -1) | |
120 | return 1; | |
121 | else | |
122 | return 0; | |
123 | case LTTNG_UST_LOGLEVEL_ALL: | |
124 | default: | |
125 | return 1; | |
126 | } | |
127 | } | |
128 | ||
129 | /* | |
130 | * Return wildcard for a given event name if the event name match the | |
131 | * one of the wildcards. | |
132 | * Must be called with ust lock held. | |
133 | * Returns NULL if not present. | |
134 | */ | |
135 | static | |
136 | struct wildcard_entry *match_wildcard(const struct lttng_event_desc *desc) | |
137 | { | |
138 | struct wildcard_entry *e; | |
139 | ||
140 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
141 | /* If only contain '*' */ | |
142 | if (strlen(e->name) == 1) | |
143 | goto possible_match; | |
144 | /* Compare excluding final '*' */ | |
145 | if (!strncmp(desc->name, e->name, strlen(e->name) - 1)) | |
146 | goto possible_match; | |
147 | continue; /* goto next, no match */ | |
148 | possible_match: | |
149 | if (ltt_loglevel_match(desc, | |
150 | e->loglevel_type, | |
151 | e->loglevel)) { | |
152 | return e; | |
153 | } | |
154 | /* no match, loop to next */ | |
155 | } | |
156 | return NULL; | |
157 | } | |
158 | ||
8165c8da MD |
159 | /* |
160 | * called at event creation if probe is missing. | |
161 | * called with session mutex held. | |
162 | */ | |
163 | static | |
457a6b58 MD |
164 | int add_pending_probe(struct ltt_event *event, const char *name, |
165 | enum lttng_ust_loglevel_type loglevel_type, | |
166 | int loglevel) | |
8165c8da MD |
167 | { |
168 | struct cds_hlist_head *head; | |
8165c8da | 169 | struct ust_pending_probe *e; |
ff412fb5 MD |
170 | size_t name_len = strlen(name); |
171 | uint32_t hash; | |
8165c8da | 172 | |
ff412fb5 MD |
173 | if (name_len > LTTNG_UST_SYM_NAME_LEN - 1) { |
174 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN - 1); | |
175 | name_len = LTTNG_UST_SYM_NAME_LEN - 1; | |
176 | } | |
177 | hash = jhash(name, name_len, 0); | |
8165c8da MD |
178 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
179 | e = zmalloc(sizeof(struct ust_pending_probe) + name_len); | |
180 | if (!e) | |
181 | return -ENOMEM; | |
ff412fb5 MD |
182 | memcpy(&e->name[0], name, name_len + 1); |
183 | e->name[name_len] = '\0'; | |
457a6b58 MD |
184 | e->loglevel_type = loglevel_type; |
185 | e->loglevel = loglevel; | |
8165c8da MD |
186 | cds_hlist_add_head(&e->node, head); |
187 | e->event = event; | |
188 | event->pending_probe = e; | |
189 | return 0; | |
190 | } | |
191 | ||
192 | /* | |
193 | * remove a pending probe. called when at event teardown and when an | |
194 | * event is fixed (probe is loaded). | |
195 | * called with session mutex held. | |
196 | */ | |
197 | static | |
198 | void remove_pending_probe(struct ust_pending_probe *e) | |
199 | { | |
200 | if (!e) | |
201 | return; | |
202 | cds_hlist_del(&e->node); | |
203 | free(e); | |
204 | } | |
205 | ||
206 | /* | |
207 | * Called at library load: connect the probe on the events pending on | |
208 | * probe load. | |
209 | * called with session mutex held. | |
210 | */ | |
211 | int pending_probe_fix_events(const struct lttng_event_desc *desc) | |
212 | { | |
213 | struct cds_hlist_head *head; | |
214 | struct cds_hlist_node *node, *p; | |
215 | struct ust_pending_probe *e; | |
216 | const char *name = desc->name; | |
8165c8da | 217 | int ret = 0; |
7ee3cc56 | 218 | struct lttng_ust_event event_param; |
ff412fb5 MD |
219 | size_t name_len = strlen(name); |
220 | uint32_t hash; | |
8165c8da | 221 | |
e6c12e3d MD |
222 | /* Wildcard */ |
223 | { | |
224 | struct wildcard_entry *wildcard; | |
225 | ||
457a6b58 | 226 | wildcard = match_wildcard(desc); |
e6c12e3d MD |
227 | if (strcmp(desc->name, "lttng_ust:metadata") && wildcard) { |
228 | struct session_wildcard *sw; | |
229 | ||
230 | cds_list_for_each_entry(sw, &wildcard->session_list, | |
231 | session_list) { | |
232 | struct ltt_event *ev; | |
233 | int ret; | |
234 | ||
235 | memcpy(&event_param, &sw->event_param, | |
236 | sizeof(event_param)); | |
237 | memcpy(event_param.name, | |
238 | desc->name, | |
239 | sizeof(event_param.name)); | |
240 | /* create event */ | |
241 | ret = ltt_event_create(sw->chan, | |
242 | &event_param, NULL, | |
243 | &ev); | |
244 | if (ret) { | |
245 | DBG("Error creating event"); | |
246 | continue; | |
247 | } | |
248 | cds_list_add(&ev->wildcard_list, | |
249 | &sw->events); | |
250 | } | |
251 | } | |
252 | } | |
253 | ||
ff412fb5 MD |
254 | if (name_len > LTTNG_UST_SYM_NAME_LEN - 1) { |
255 | WARN("Truncating tracepoint name %s which exceeds size limits of %u chars", name, LTTNG_UST_SYM_NAME_LEN - 1); | |
256 | name_len = LTTNG_UST_SYM_NAME_LEN - 1; | |
257 | } | |
258 | hash = jhash(name, name_len, 0); | |
8165c8da MD |
259 | head = &pending_probe_table[hash & (PENDING_PROBE_HASH_SIZE - 1)]; |
260 | cds_hlist_for_each_entry_safe(e, node, p, head, node) { | |
261 | struct ltt_event *event; | |
262 | struct ltt_channel *chan; | |
263 | ||
fe2d02f4 | 264 | if (!ltt_loglevel_match(desc, |
457a6b58 MD |
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 | } | |
fe2d02f4 | 272 | event = e->event; |
8165c8da MD |
273 | chan = event->chan; |
274 | assert(!event->desc); | |
275 | event->desc = desc; | |
276 | event->pending_probe = NULL; | |
277 | remove_pending_probe(e); | |
278 | ret |= __tracepoint_probe_register(name, | |
279 | event->desc->probe_callback, | |
280 | event); | |
636c5aa4 MD |
281 | if (ret) |
282 | continue; | |
283 | event->id = chan->free_event_id++; | |
8165c8da MD |
284 | ret |= _ltt_event_metadata_statedump(chan->session, chan, |
285 | event); | |
286 | } | |
287 | return ret; | |
288 | } | |
289 | ||
8020ceb5 MD |
290 | void synchronize_trace(void) |
291 | { | |
8020ceb5 | 292 | synchronize_rcu(); |
8020ceb5 MD |
293 | } |
294 | ||
295 | struct ltt_session *ltt_session_create(void) | |
296 | { | |
297 | struct ltt_session *session; | |
298 | ||
b5234c06 | 299 | session = zmalloc(sizeof(struct ltt_session)); |
8020ceb5 MD |
300 | if (!session) |
301 | return NULL; | |
b5234c06 MD |
302 | CDS_INIT_LIST_HEAD(&session->chan); |
303 | CDS_INIT_LIST_HEAD(&session->events); | |
e6c12e3d | 304 | CDS_INIT_LIST_HEAD(&session->wildcards); |
b5234c06 MD |
305 | uuid_generate(session->uuid); |
306 | cds_list_add(&session->list, &sessions); | |
8020ceb5 MD |
307 | return session; |
308 | } | |
309 | ||
310 | void ltt_session_destroy(struct ltt_session *session) | |
311 | { | |
312 | struct ltt_channel *chan, *tmpchan; | |
313 | struct ltt_event *event, *tmpevent; | |
e6c12e3d | 314 | struct session_wildcard *wildcard, *tmpwildcard; |
8020ceb5 MD |
315 | int ret; |
316 | ||
b5234c06 MD |
317 | CMM_ACCESS_ONCE(session->active) = 0; |
318 | cds_list_for_each_entry(event, &session->events, list) { | |
8020ceb5 MD |
319 | ret = _ltt_event_unregister(event); |
320 | WARN_ON(ret); | |
321 | } | |
322 | synchronize_trace(); /* Wait for in-flight events to complete */ | |
e6c12e3d MD |
323 | cds_list_for_each_entry_safe(wildcard, tmpwildcard, &session->wildcards, list) |
324 | _ltt_wildcard_destroy(wildcard); | |
b5234c06 | 325 | cds_list_for_each_entry_safe(event, tmpevent, &session->events, list) |
8020ceb5 | 326 | _ltt_event_destroy(event); |
b5234c06 | 327 | cds_list_for_each_entry_safe(chan, tmpchan, &session->chan, list) |
8020ceb5 | 328 | _ltt_channel_destroy(chan); |
b5234c06 | 329 | cds_list_del(&session->list); |
b5234c06 | 330 | free(session); |
8020ceb5 MD |
331 | } |
332 | ||
976fe9ea | 333 | int ltt_session_enable(struct ltt_session *session) |
8020ceb5 MD |
334 | { |
335 | int ret = 0; | |
336 | struct ltt_channel *chan; | |
337 | ||
8020ceb5 MD |
338 | if (session->active) { |
339 | ret = -EBUSY; | |
340 | goto end; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Snapshot the number of events per channel to know the type of header | |
345 | * we need to use. | |
346 | */ | |
b5234c06 | 347 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
348 | if (chan->header_type) |
349 | continue; /* don't change it if session stop/restart */ | |
350 | if (chan->free_event_id < 31) | |
351 | chan->header_type = 1; /* compact */ | |
352 | else | |
353 | chan->header_type = 2; /* large */ | |
354 | } | |
355 | ||
b5234c06 MD |
356 | CMM_ACCESS_ONCE(session->active) = 1; |
357 | CMM_ACCESS_ONCE(session->been_active) = 1; | |
8020ceb5 | 358 | ret = _ltt_session_metadata_statedump(session); |
4b4de73e | 359 | if (ret) |
b5234c06 | 360 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 361 | end: |
8020ceb5 MD |
362 | return ret; |
363 | } | |
364 | ||
976fe9ea | 365 | int ltt_session_disable(struct ltt_session *session) |
8020ceb5 MD |
366 | { |
367 | int ret = 0; | |
368 | ||
8020ceb5 MD |
369 | if (!session->active) { |
370 | ret = -EBUSY; | |
371 | goto end; | |
372 | } | |
b5234c06 | 373 | CMM_ACCESS_ONCE(session->active) = 0; |
8020ceb5 | 374 | end: |
8020ceb5 MD |
375 | return ret; |
376 | } | |
377 | ||
976fe9ea MD |
378 | int ltt_channel_enable(struct ltt_channel *channel) |
379 | { | |
380 | int old; | |
381 | ||
9beb36ba MD |
382 | if (channel == channel->session->metadata) |
383 | return -EPERM; | |
b5234c06 | 384 | old = uatomic_xchg(&channel->enabled, 1); |
976fe9ea MD |
385 | if (old) |
386 | return -EEXIST; | |
387 | return 0; | |
388 | } | |
389 | ||
390 | int ltt_channel_disable(struct ltt_channel *channel) | |
391 | { | |
392 | int old; | |
393 | ||
9beb36ba MD |
394 | if (channel == channel->session->metadata) |
395 | return -EPERM; | |
b5234c06 | 396 | old = uatomic_xchg(&channel->enabled, 0); |
976fe9ea MD |
397 | if (!old) |
398 | return -EEXIST; | |
399 | return 0; | |
400 | } | |
401 | ||
402 | int ltt_event_enable(struct ltt_event *event) | |
403 | { | |
404 | int old; | |
405 | ||
9beb36ba MD |
406 | if (event->chan == event->chan->session->metadata) |
407 | return -EPERM; | |
b5234c06 | 408 | old = uatomic_xchg(&event->enabled, 1); |
976fe9ea MD |
409 | if (old) |
410 | return -EEXIST; | |
411 | return 0; | |
412 | } | |
413 | ||
414 | int ltt_event_disable(struct ltt_event *event) | |
415 | { | |
416 | int old; | |
417 | ||
9beb36ba MD |
418 | if (event->chan == event->chan->session->metadata) |
419 | return -EPERM; | |
b5234c06 | 420 | old = uatomic_xchg(&event->enabled, 0); |
976fe9ea MD |
421 | if (!old) |
422 | return -EEXIST; | |
423 | return 0; | |
424 | } | |
425 | ||
8020ceb5 MD |
426 | struct ltt_channel *ltt_channel_create(struct ltt_session *session, |
427 | const char *transport_name, | |
428 | void *buf_addr, | |
429 | size_t subbuf_size, size_t num_subbuf, | |
430 | unsigned int switch_timer_interval, | |
193183fb | 431 | unsigned int read_timer_interval, |
ef9ff354 MD |
432 | int **shm_fd, int **wait_fd, |
433 | uint64_t **memory_map_size, | |
d028eddb | 434 | struct ltt_channel *chan_priv_init) |
8020ceb5 | 435 | { |
a3f61e7f | 436 | struct ltt_channel *chan = NULL; |
8020ceb5 MD |
437 | struct ltt_transport *transport; |
438 | ||
8020ceb5 MD |
439 | if (session->been_active) |
440 | goto active; /* Refuse to add channel to active session */ | |
441 | transport = ltt_transport_find(transport_name); | |
442 | if (!transport) { | |
b5234c06 | 443 | DBG("LTTng transport %s not found\n", |
8020ceb5 MD |
444 | transport_name); |
445 | goto notransport; | |
446 | } | |
d028eddb MD |
447 | chan_priv_init->id = session->free_chan_id++; |
448 | chan_priv_init->session = session; | |
8020ceb5 MD |
449 | /* |
450 | * Note: the channel creation op already writes into the packet | |
451 | * headers. Therefore the "chan" information used as input | |
452 | * should be already accessible. | |
453 | */ | |
a3f61e7f | 454 | chan = transport->ops.channel_create("[lttng]", buf_addr, |
8020ceb5 | 455 | subbuf_size, num_subbuf, switch_timer_interval, |
193183fb | 456 | read_timer_interval, shm_fd, wait_fd, |
d028eddb | 457 | memory_map_size, chan_priv_init); |
a3f61e7f | 458 | if (!chan) |
8020ceb5 | 459 | goto create_error; |
976fe9ea | 460 | chan->enabled = 1; |
8020ceb5 | 461 | chan->ops = &transport->ops; |
b5234c06 | 462 | cds_list_add(&chan->list, &session->chan); |
8020ceb5 MD |
463 | return chan; |
464 | ||
465 | create_error: | |
8020ceb5 MD |
466 | notransport: |
467 | active: | |
8020ceb5 MD |
468 | return NULL; |
469 | } | |
470 | ||
471 | /* | |
472 | * Only used internally at session destruction. | |
473 | */ | |
474 | static | |
475 | void _ltt_channel_destroy(struct ltt_channel *chan) | |
476 | { | |
b5234c06 | 477 | cds_list_del(&chan->list); |
8020ceb5 | 478 | lttng_destroy_context(chan->ctx); |
a3f61e7f | 479 | chan->ops->channel_destroy(chan); |
8020ceb5 MD |
480 | } |
481 | ||
482 | /* | |
483 | * Supports event creation while tracing session is active. | |
484 | */ | |
576599a0 MD |
485 | int ltt_event_create(struct ltt_channel *chan, |
486 | struct lttng_ust_event *event_param, | |
487 | void *filter, | |
488 | struct ltt_event **_event) | |
8020ceb5 | 489 | { |
457a6b58 | 490 | const struct lttng_event_desc *desc = NULL; /* silence gcc */ |
8020ceb5 | 491 | struct ltt_event *event; |
576599a0 | 492 | int ret = 0; |
8020ceb5 | 493 | |
576599a0 MD |
494 | if (chan->used_event_id == -1UL) { |
495 | ret = -ENOMEM; | |
8020ceb5 | 496 | goto full; |
576599a0 | 497 | } |
8020ceb5 MD |
498 | /* |
499 | * This is O(n^2) (for each event, the loop is called at event | |
500 | * creation). Might require a hash if we have lots of events. | |
501 | */ | |
576599a0 | 502 | cds_list_for_each_entry(event, &chan->session->events, list) { |
ff412fb5 MD |
503 | if (event->desc && !strncmp(event->desc->name, |
504 | event_param->name, | |
505 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
576599a0 | 506 | ret = -EEXIST; |
8020ceb5 | 507 | goto exist; |
576599a0 MD |
508 | } |
509 | } | |
457a6b58 MD |
510 | |
511 | /* | |
512 | * Check if loglevel match. Refuse to connect event if not. | |
513 | */ | |
514 | if (event_param->instrumentation == LTTNG_UST_TRACEPOINT) { | |
515 | desc = ltt_event_get(event_param->name); | |
fe2d02f4 MD |
516 | if (desc) { |
517 | if (!ltt_loglevel_match(desc, | |
518 | event_param->loglevel_type, | |
519 | event_param->loglevel)) { | |
520 | ret = -EPERM; | |
521 | goto no_loglevel_match; | |
522 | } | |
457a6b58 | 523 | } |
fe2d02f4 MD |
524 | /* |
525 | * If descriptor is not there, it will be added to | |
526 | * pending probes. | |
527 | */ | |
457a6b58 | 528 | } |
b5234c06 | 529 | event = zmalloc(sizeof(struct ltt_event)); |
576599a0 MD |
530 | if (!event) { |
531 | ret = -ENOMEM; | |
8020ceb5 | 532 | goto cache_error; |
576599a0 | 533 | } |
8020ceb5 MD |
534 | event->chan = chan; |
535 | event->filter = filter; | |
8165c8da MD |
536 | /* |
537 | * used_event_id counts the maximum number of event IDs that can | |
538 | * register if all probes register. | |
539 | */ | |
540 | chan->used_event_id++; | |
976fe9ea | 541 | event->enabled = 1; |
8020ceb5 MD |
542 | event->instrumentation = event_param->instrumentation; |
543 | /* Populate ltt_event structure before tracepoint registration. */ | |
b5234c06 | 544 | cmm_smp_wmb(); |
8020ceb5 | 545 | switch (event_param->instrumentation) { |
b5234c06 | 546 | case LTTNG_UST_TRACEPOINT: |
457a6b58 | 547 | event->desc = desc; |
8165c8da MD |
548 | if (event->desc) { |
549 | ret = __tracepoint_probe_register(event_param->name, | |
550 | event->desc->probe_callback, | |
551 | event); | |
552 | if (ret) | |
553 | goto register_error; | |
554 | event->id = chan->free_event_id++; | |
555 | } else { | |
556 | /* | |
557 | * If the probe is not present, event->desc stays NULL, | |
558 | * waiting for the probe to register, and the event->id | |
559 | * stays unallocated. | |
560 | */ | |
457a6b58 MD |
561 | ret = add_pending_probe(event, event_param->name, |
562 | event_param->loglevel_type, | |
563 | event_param->loglevel); | |
8165c8da MD |
564 | if (ret) |
565 | goto add_pending_error; | |
566 | } | |
8020ceb5 | 567 | break; |
8020ceb5 MD |
568 | default: |
569 | WARN_ON_ONCE(1); | |
570 | } | |
8165c8da MD |
571 | if (event->desc) { |
572 | ret = _ltt_event_metadata_statedump(chan->session, chan, event); | |
573 | if (ret) | |
574 | goto statedump_error; | |
575 | } | |
b5234c06 | 576 | cds_list_add(&event->list, &chan->session->events); |
576599a0 MD |
577 | *_event = event; |
578 | return 0; | |
8020ceb5 MD |
579 | |
580 | statedump_error: | |
8165c8da MD |
581 | if (event->desc) { |
582 | WARN_ON_ONCE(__tracepoint_probe_unregister(event_param->name, | |
583 | event->desc->probe_callback, | |
584 | event)); | |
585 | ltt_event_put(event->desc); | |
586 | } | |
587 | add_pending_error: | |
8020ceb5 | 588 | register_error: |
b5234c06 | 589 | free(event); |
8020ceb5 | 590 | cache_error: |
457a6b58 | 591 | no_loglevel_match: |
8020ceb5 MD |
592 | exist: |
593 | full: | |
576599a0 | 594 | return ret; |
8020ceb5 MD |
595 | } |
596 | ||
597 | /* | |
598 | * Only used internally at session destruction. | |
599 | */ | |
600 | int _ltt_event_unregister(struct ltt_event *event) | |
601 | { | |
602 | int ret = -EINVAL; | |
603 | ||
604 | switch (event->instrumentation) { | |
b5234c06 | 605 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
606 | if (event->desc) { |
607 | ret = __tracepoint_probe_unregister(event->desc->name, | |
608 | event->desc->probe_callback, | |
609 | event); | |
610 | if (ret) | |
611 | return ret; | |
612 | } else { | |
613 | remove_pending_probe(event->pending_probe); | |
614 | ret = 0; | |
615 | } | |
8020ceb5 | 616 | break; |
8020ceb5 MD |
617 | default: |
618 | WARN_ON_ONCE(1); | |
619 | } | |
620 | return ret; | |
621 | } | |
622 | ||
623 | /* | |
624 | * Only used internally at session destruction. | |
625 | */ | |
626 | static | |
627 | void _ltt_event_destroy(struct ltt_event *event) | |
628 | { | |
629 | switch (event->instrumentation) { | |
b5234c06 | 630 | case LTTNG_UST_TRACEPOINT: |
8165c8da MD |
631 | if (event->desc) { |
632 | ltt_event_put(event->desc); | |
633 | } | |
8020ceb5 | 634 | break; |
8020ceb5 MD |
635 | default: |
636 | WARN_ON_ONCE(1); | |
637 | } | |
b5234c06 | 638 | cds_list_del(&event->list); |
8020ceb5 | 639 | lttng_destroy_context(event->ctx); |
b5234c06 | 640 | free(event); |
8020ceb5 MD |
641 | } |
642 | ||
643 | /* | |
644 | * We have exclusive access to our metadata buffer (protected by the | |
17dfb34b | 645 | * ust_lock), so we can do racy operations such as looking for |
8020ceb5 MD |
646 | * remaining space left in packet and write, since mutual exclusion |
647 | * protects us from concurrent writes. | |
648 | */ | |
649 | int lttng_metadata_printf(struct ltt_session *session, | |
650 | const char *fmt, ...) | |
651 | { | |
4cfec15c | 652 | struct lttng_ust_lib_ring_buffer_ctx ctx; |
8020ceb5 | 653 | struct ltt_channel *chan = session->metadata; |
b5234c06 | 654 | char *str = NULL; |
8020ceb5 MD |
655 | int ret = 0, waitret; |
656 | size_t len, reserve_len, pos; | |
657 | va_list ap; | |
658 | ||
b5234c06 | 659 | WARN_ON_ONCE(!CMM_ACCESS_ONCE(session->active)); |
8020ceb5 MD |
660 | |
661 | va_start(ap, fmt); | |
b5234c06 | 662 | ret = vasprintf(&str, fmt, ap); |
8020ceb5 | 663 | va_end(ap); |
b5234c06 | 664 | if (ret < 0) |
8020ceb5 MD |
665 | return -ENOMEM; |
666 | ||
667 | len = strlen(str); | |
668 | pos = 0; | |
669 | ||
670 | for (pos = 0; pos < len; pos += reserve_len) { | |
671 | reserve_len = min_t(size_t, | |
1d498196 | 672 | chan->ops->packet_avail_size(chan->chan, chan->handle), |
8020ceb5 MD |
673 | len - pos); |
674 | lib_ring_buffer_ctx_init(&ctx, chan->chan, NULL, reserve_len, | |
1d498196 | 675 | sizeof(char), -1, chan->handle); |
8020ceb5 MD |
676 | /* |
677 | * We don't care about metadata buffer's records lost | |
678 | * count, because we always retry here. Report error if | |
679 | * we need to bail out after timeout or being | |
680 | * interrupted. | |
681 | */ | |
b5234c06 | 682 | waitret = wait_cond_interruptible_timeout( |
8020ceb5 MD |
683 | ({ |
684 | ret = chan->ops->event_reserve(&ctx, 0); | |
685 | ret != -ENOBUFS || !ret; | |
686 | }), | |
b5234c06 | 687 | LTTNG_METADATA_TIMEOUT_MSEC); |
b472cfc0 | 688 | if (waitret == -ETIMEDOUT || waitret == -EINTR || ret) { |
b5234c06 MD |
689 | DBG("LTTng: Failure to write metadata to buffers (%s)\n", |
690 | waitret == -EINTR ? "interrupted" : | |
8020ceb5 | 691 | (ret == -ENOBUFS ? "timeout" : "I/O error")); |
b5234c06 | 692 | if (waitret == -EINTR) |
8020ceb5 MD |
693 | ret = waitret; |
694 | goto end; | |
695 | } | |
696 | chan->ops->event_write(&ctx, &str[pos], reserve_len); | |
697 | chan->ops->event_commit(&ctx); | |
698 | } | |
699 | end: | |
b5234c06 | 700 | free(str); |
8020ceb5 MD |
701 | return ret; |
702 | } | |
703 | ||
704 | static | |
705 | int _ltt_field_statedump(struct ltt_session *session, | |
706 | const struct lttng_event_field *field) | |
707 | { | |
708 | int ret = 0; | |
709 | ||
710 | switch (field->type.atype) { | |
711 | case atype_integer: | |
712 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 713 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n", |
8020ceb5 MD |
714 | field->type.u.basic.integer.size, |
715 | field->type.u.basic.integer.alignment, | |
716 | field->type.u.basic.integer.signedness, | |
717 | (field->type.u.basic.integer.encoding == lttng_encode_none) | |
718 | ? "none" | |
719 | : (field->type.u.basic.integer.encoding == lttng_encode_UTF8) | |
720 | ? "UTF8" | |
721 | : "ASCII", | |
722 | field->type.u.basic.integer.base, | |
8a98a75d | 723 | #if (BYTE_ORDER == BIG_ENDIAN) |
403c40b4 MD |
724 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
725 | #else | |
726 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
727 | #endif | |
728 | field->name); | |
729 | break; | |
730 | case atype_float: | |
731 | ret = lttng_metadata_printf(session, | |
8a98a75d | 732 | " floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n", |
403c40b4 MD |
733 | field->type.u.basic._float.exp_dig, |
734 | field->type.u.basic._float.mant_dig, | |
735 | field->type.u.basic._float.alignment, | |
8a98a75d | 736 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
737 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
738 | #else | |
739 | field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
740 | #endif | |
741 | field->name); | |
742 | break; | |
743 | case atype_enum: | |
744 | ret = lttng_metadata_printf(session, | |
745 | " %s %s;\n", | |
746 | field->type.u.basic.enumeration.name, | |
747 | field->name); | |
748 | break; | |
749 | case atype_array: | |
750 | { | |
751 | const struct lttng_basic_type *elem_type; | |
752 | ||
753 | elem_type = &field->type.u.array.elem_type; | |
754 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 755 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n", |
8020ceb5 MD |
756 | elem_type->u.basic.integer.size, |
757 | elem_type->u.basic.integer.alignment, | |
758 | elem_type->u.basic.integer.signedness, | |
759 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
760 | ? "none" | |
761 | : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
762 | ? "UTF8" | |
763 | : "ASCII", | |
764 | elem_type->u.basic.integer.base, | |
8a98a75d | 765 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
766 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
767 | #else | |
768 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
769 | #endif | |
770 | field->name, field->type.u.array.length); | |
771 | break; | |
772 | } | |
773 | case atype_sequence: | |
774 | { | |
775 | const struct lttng_basic_type *elem_type; | |
776 | const struct lttng_basic_type *length_type; | |
777 | ||
778 | elem_type = &field->type.u.sequence.elem_type; | |
779 | length_type = &field->type.u.sequence.length_type; | |
780 | ret = lttng_metadata_printf(session, | |
781 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n", | |
782 | length_type->u.basic.integer.size, | |
783 | (unsigned int) length_type->u.basic.integer.alignment, | |
784 | length_type->u.basic.integer.signedness, | |
785 | (length_type->u.basic.integer.encoding == lttng_encode_none) | |
786 | ? "none" | |
787 | : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
788 | ? "UTF8" | |
789 | : "ASCII"), | |
790 | length_type->u.basic.integer.base, | |
8a98a75d | 791 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
792 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
793 | #else | |
794 | length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
795 | #endif | |
796 | field->name); | |
797 | if (ret) | |
798 | return ret; | |
799 | ||
800 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 801 | " integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n", |
8020ceb5 MD |
802 | elem_type->u.basic.integer.size, |
803 | (unsigned int) elem_type->u.basic.integer.alignment, | |
804 | elem_type->u.basic.integer.signedness, | |
805 | (elem_type->u.basic.integer.encoding == lttng_encode_none) | |
806 | ? "none" | |
807 | : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8) | |
808 | ? "UTF8" | |
809 | : "ASCII"), | |
810 | elem_type->u.basic.integer.base, | |
8a98a75d | 811 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
812 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "", |
813 | #else | |
814 | elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "", | |
815 | #endif | |
816 | field->name, | |
817 | field->name); | |
818 | break; | |
819 | } | |
820 | ||
821 | case atype_string: | |
822 | /* Default encoding is UTF8 */ | |
823 | ret = lttng_metadata_printf(session, | |
4e2ee1f5 | 824 | " string%s _%s;\n", |
8020ceb5 MD |
825 | field->type.u.basic.string.encoding == lttng_encode_ASCII ? |
826 | " { encoding = ASCII; }" : "", | |
827 | field->name); | |
828 | break; | |
829 | default: | |
830 | WARN_ON_ONCE(1); | |
831 | return -EINVAL; | |
832 | } | |
833 | return ret; | |
834 | } | |
835 | ||
836 | static | |
837 | int _ltt_context_metadata_statedump(struct ltt_session *session, | |
838 | struct lttng_ctx *ctx) | |
839 | { | |
840 | int ret = 0; | |
841 | int i; | |
842 | ||
843 | if (!ctx) | |
844 | return 0; | |
845 | for (i = 0; i < ctx->nr_fields; i++) { | |
846 | const struct lttng_ctx_field *field = &ctx->fields[i]; | |
847 | ||
848 | ret = _ltt_field_statedump(session, &field->event_field); | |
849 | if (ret) | |
850 | return ret; | |
851 | } | |
852 | return ret; | |
853 | } | |
854 | ||
855 | static | |
856 | int _ltt_fields_metadata_statedump(struct ltt_session *session, | |
857 | struct ltt_event *event) | |
858 | { | |
859 | const struct lttng_event_desc *desc = event->desc; | |
860 | int ret = 0; | |
861 | int i; | |
862 | ||
863 | for (i = 0; i < desc->nr_fields; i++) { | |
864 | const struct lttng_event_field *field = &desc->fields[i]; | |
865 | ||
866 | ret = _ltt_field_statedump(session, field); | |
867 | if (ret) | |
868 | return ret; | |
869 | } | |
870 | return ret; | |
871 | } | |
872 | ||
873 | static | |
874 | int _ltt_event_metadata_statedump(struct ltt_session *session, | |
875 | struct ltt_channel *chan, | |
876 | struct ltt_event *event) | |
877 | { | |
878 | int ret = 0; | |
8155c5e8 | 879 | int loglevel = TRACE_DEFAULT; |
8020ceb5 | 880 | |
b5234c06 | 881 | if (event->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
882 | return 0; |
883 | if (chan == session->metadata) | |
884 | return 0; | |
8165c8da MD |
885 | /* |
886 | * Don't print events for which probe load is pending. | |
887 | */ | |
888 | if (!event->desc) | |
889 | return 0; | |
8020ceb5 MD |
890 | |
891 | ret = lttng_metadata_printf(session, | |
892 | "event {\n" | |
7083f0fe | 893 | " name = \"%s\";\n" |
8020ceb5 MD |
894 | " id = %u;\n" |
895 | " stream_id = %u;\n", | |
896 | event->desc->name, | |
897 | event->id, | |
898 | event->chan->id); | |
899 | if (ret) | |
900 | goto end; | |
901 | ||
8155c5e8 MD |
902 | if (event->desc->loglevel) |
903 | loglevel = *(*event->desc->loglevel); | |
904 | ||
905 | ret = lttng_metadata_printf(session, | |
906 | " loglevel = %d;\n", | |
907 | loglevel); | |
908 | if (ret) | |
909 | goto end; | |
e6c12e3d | 910 | |
8020ceb5 MD |
911 | if (event->ctx) { |
912 | ret = lttng_metadata_printf(session, | |
913 | " context := struct {\n"); | |
914 | if (ret) | |
915 | goto end; | |
916 | } | |
917 | ret = _ltt_context_metadata_statedump(session, event->ctx); | |
918 | if (ret) | |
919 | goto end; | |
920 | if (event->ctx) { | |
921 | ret = lttng_metadata_printf(session, | |
922 | " };\n"); | |
923 | if (ret) | |
924 | goto end; | |
925 | } | |
926 | ||
927 | ret = lttng_metadata_printf(session, | |
928 | " fields := struct {\n" | |
929 | ); | |
930 | if (ret) | |
931 | goto end; | |
932 | ||
933 | ret = _ltt_fields_metadata_statedump(session, event); | |
934 | if (ret) | |
935 | goto end; | |
936 | ||
937 | /* | |
938 | * LTTng space reservation can only reserve multiples of the | |
939 | * byte size. | |
940 | */ | |
941 | ret = lttng_metadata_printf(session, | |
942 | " };\n" | |
943 | "};\n\n"); | |
944 | if (ret) | |
945 | goto end; | |
946 | ||
947 | event->metadata_dumped = 1; | |
948 | end: | |
949 | return ret; | |
950 | ||
951 | } | |
952 | ||
953 | static | |
954 | int _ltt_channel_metadata_statedump(struct ltt_session *session, | |
955 | struct ltt_channel *chan) | |
956 | { | |
957 | int ret = 0; | |
958 | ||
b5234c06 | 959 | if (chan->metadata_dumped || !CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
960 | return 0; |
961 | if (chan == session->metadata) | |
962 | return 0; | |
963 | ||
964 | WARN_ON_ONCE(!chan->header_type); | |
965 | ret = lttng_metadata_printf(session, | |
966 | "stream {\n" | |
967 | " id = %u;\n" | |
968 | " event.header := %s;\n" | |
969 | " packet.context := struct packet_context;\n", | |
970 | chan->id, | |
971 | chan->header_type == 1 ? "struct event_header_compact" : | |
972 | "struct event_header_large"); | |
973 | if (ret) | |
974 | goto end; | |
975 | ||
976 | if (chan->ctx) { | |
977 | ret = lttng_metadata_printf(session, | |
978 | " event.context := struct {\n"); | |
979 | if (ret) | |
980 | goto end; | |
981 | } | |
982 | ret = _ltt_context_metadata_statedump(session, chan->ctx); | |
983 | if (ret) | |
984 | goto end; | |
985 | if (chan->ctx) { | |
986 | ret = lttng_metadata_printf(session, | |
987 | " };\n"); | |
988 | if (ret) | |
989 | goto end; | |
990 | } | |
991 | ||
992 | ret = lttng_metadata_printf(session, | |
993 | "};\n\n"); | |
994 | ||
995 | chan->metadata_dumped = 1; | |
996 | end: | |
997 | return ret; | |
998 | } | |
999 | ||
1000 | static | |
1001 | int _ltt_stream_packet_context_declare(struct ltt_session *session) | |
1002 | { | |
1003 | return lttng_metadata_printf(session, | |
1004 | "struct packet_context {\n" | |
28b12049 MD |
1005 | " uint64_clock_monotonic_t timestamp_begin;\n" |
1006 | " uint64_clock_monotonic_t timestamp_end;\n" | |
8020ceb5 MD |
1007 | " uint32_t events_discarded;\n" |
1008 | " uint32_t content_size;\n" | |
1009 | " uint32_t packet_size;\n" | |
1010 | " uint32_t cpu_id;\n" | |
1011 | "};\n\n" | |
1012 | ); | |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * Compact header: | |
1017 | * id: range: 0 - 30. | |
1018 | * id 31 is reserved to indicate an extended header. | |
1019 | * | |
1020 | * Large header: | |
1021 | * id: range: 0 - 65534. | |
1022 | * id 65535 is reserved to indicate an extended header. | |
1023 | */ | |
1024 | static | |
1025 | int _ltt_event_header_declare(struct ltt_session *session) | |
1026 | { | |
1027 | return lttng_metadata_printf(session, | |
1028 | "struct event_header_compact {\n" | |
1029 | " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" | |
1030 | " variant <id> {\n" | |
1031 | " struct {\n" | |
28b12049 | 1032 | " uint27_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1033 | " } compact;\n" |
1034 | " struct {\n" | |
1035 | " uint32_t id;\n" | |
28b12049 | 1036 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1037 | " } extended;\n" |
1038 | " } v;\n" | |
1039 | "} align(%u);\n" | |
1040 | "\n" | |
1041 | "struct event_header_large {\n" | |
1042 | " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" | |
1043 | " variant <id> {\n" | |
1044 | " struct {\n" | |
28b12049 | 1045 | " uint32_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1046 | " } compact;\n" |
1047 | " struct {\n" | |
1048 | " uint32_t id;\n" | |
28b12049 | 1049 | " uint64_clock_monotonic_t timestamp;\n" |
8020ceb5 MD |
1050 | " } extended;\n" |
1051 | " } v;\n" | |
1052 | "} align(%u);\n\n", | |
1dbfff0c MD |
1053 | lttng_alignof(uint32_t) * CHAR_BIT, |
1054 | lttng_alignof(uint16_t) * CHAR_BIT | |
8020ceb5 MD |
1055 | ); |
1056 | } | |
1057 | ||
28b12049 MD |
1058 | /* |
1059 | * Approximation of NTP time of day to clock monotonic correlation, | |
1060 | * taken at start of trace. | |
1061 | * Yes, this is only an approximation. Yes, we can (and will) do better | |
1062 | * in future versions. | |
1063 | */ | |
1064 | static | |
1065 | uint64_t measure_clock_offset(void) | |
1066 | { | |
1067 | uint64_t offset, monotonic[2], realtime; | |
1068 | struct timespec rts = { 0, 0 }; | |
1069 | int ret; | |
1070 | ||
1071 | monotonic[0] = trace_clock_read64(); | |
1072 | ret = clock_gettime(CLOCK_REALTIME, &rts); | |
1073 | if (ret < 0) | |
1074 | return 0; | |
1075 | monotonic[1] = trace_clock_read64(); | |
1076 | offset = (monotonic[0] + monotonic[1]) >> 1; | |
1077 | realtime = rts.tv_sec * 1000000000ULL; | |
1078 | realtime += rts.tv_nsec; | |
1079 | offset = realtime - offset; | |
1080 | return offset; | |
1081 | } | |
1082 | ||
8020ceb5 MD |
1083 | /* |
1084 | * Output metadata into this session's metadata buffers. | |
1085 | */ | |
1086 | static | |
1087 | int _ltt_session_metadata_statedump(struct ltt_session *session) | |
1088 | { | |
b5234c06 | 1089 | unsigned char *uuid_c = session->uuid; |
939950af | 1090 | char uuid_s[37], clock_uuid_s[CLOCK_UUID_LEN]; |
8020ceb5 MD |
1091 | struct ltt_channel *chan; |
1092 | struct ltt_event *event; | |
1093 | int ret = 0; | |
48621a42 | 1094 | char procname[LTTNG_UST_PROCNAME_LEN] = ""; |
8020ceb5 | 1095 | |
b5234c06 | 1096 | if (!CMM_ACCESS_ONCE(session->active)) |
8020ceb5 MD |
1097 | return 0; |
1098 | if (session->metadata_dumped) | |
1099 | goto skip_session; | |
1100 | if (!session->metadata) { | |
b5234c06 | 1101 | DBG("LTTng: attempt to start tracing, but metadata channel is not found. Operation abort.\n"); |
8020ceb5 MD |
1102 | return -EPERM; |
1103 | } | |
1104 | ||
1105 | snprintf(uuid_s, sizeof(uuid_s), | |
1106 | "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
1107 | uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3], | |
1108 | uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7], | |
1109 | uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11], | |
1110 | uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]); | |
1111 | ||
1112 | ret = lttng_metadata_printf(session, | |
1113 | "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n" | |
1114 | "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" | |
1115 | "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" | |
1116 | "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" | |
1117 | "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" | |
1118 | "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" | |
1119 | "\n" | |
1120 | "trace {\n" | |
1121 | " major = %u;\n" | |
1122 | " minor = %u;\n" | |
1123 | " uuid = \"%s\";\n" | |
1124 | " byte_order = %s;\n" | |
1125 | " packet.header := struct {\n" | |
1126 | " uint32_t magic;\n" | |
1127 | " uint8_t uuid[16];\n" | |
1128 | " uint32_t stream_id;\n" | |
1129 | " };\n" | |
1130 | "};\n\n", | |
1dbfff0c MD |
1131 | lttng_alignof(uint8_t) * CHAR_BIT, |
1132 | lttng_alignof(uint16_t) * CHAR_BIT, | |
1133 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1134 | lttng_alignof(uint64_t) * CHAR_BIT, | |
2694975d MD |
1135 | CTF_SPEC_MAJOR, |
1136 | CTF_SPEC_MINOR, | |
8020ceb5 | 1137 | uuid_s, |
8a98a75d | 1138 | #if (BYTE_ORDER == BIG_ENDIAN) |
8020ceb5 MD |
1139 | "be" |
1140 | #else | |
1141 | "le" | |
1142 | #endif | |
1143 | ); | |
1144 | if (ret) | |
1145 | goto end; | |
1146 | ||
b020e504 | 1147 | /* ignore error, just use empty string if error. */ |
48621a42 MD |
1148 | lttng_ust_getprocname(procname); |
1149 | procname[LTTNG_UST_PROCNAME_LEN - 1] = '\0'; | |
b020e504 MD |
1150 | ret = lttng_metadata_printf(session, |
1151 | "env {\n" | |
1152 | " vpid = %d;\n" | |
1153 | " procname = \"%s\";\n" | |
2694975d MD |
1154 | " domain = \"ust\";\n" |
1155 | " tracer_name = \"lttng-ust\";\n" | |
1156 | " tracer_major = %u;\n" | |
1157 | " tracer_minor = %u;\n" | |
1158 | " tracer_patchlevel = %u;\n" | |
b020e504 MD |
1159 | "};\n\n", |
1160 | (int) getpid(), | |
1161 | procname, | |
2694975d MD |
1162 | LTTNG_UST_MAJOR_VERSION, |
1163 | LTTNG_UST_MINOR_VERSION, | |
1164 | LTTNG_UST_PATCHLEVEL_VERSION | |
b020e504 MD |
1165 | ); |
1166 | if (ret) | |
1167 | goto end; | |
1168 | ||
28b12049 MD |
1169 | ret = lttng_metadata_printf(session, |
1170 | "clock {\n" | |
939950af MD |
1171 | " name = %s;\n", |
1172 | "monotonic" | |
1173 | ); | |
1174 | if (ret) | |
1175 | goto end; | |
1176 | ||
1177 | if (!trace_clock_uuid(clock_uuid_s)) { | |
1178 | ret = lttng_metadata_printf(session, | |
1179 | " uuid = \"%s\";\n", | |
1180 | clock_uuid_s | |
1181 | ); | |
1182 | if (ret) | |
1183 | goto end; | |
1184 | } | |
1185 | ||
1186 | ret = lttng_metadata_printf(session, | |
28b12049 MD |
1187 | " description = \"Monotonic Clock\";\n" |
1188 | " freq = %" PRIu64 "; /* Frequency, in Hz */\n" | |
1189 | " /* clock value offset from Epoch is: offset * (1/freq) */\n" | |
1190 | " offset = %" PRIu64 ";\n" | |
1191 | "};\n\n", | |
28b12049 MD |
1192 | trace_clock_freq(), |
1193 | measure_clock_offset() | |
1194 | ); | |
1195 | if (ret) | |
1196 | goto end; | |
1197 | ||
1198 | ret = lttng_metadata_printf(session, | |
1199 | "typealias integer {\n" | |
1200 | " size = 27; align = 1; signed = false;\n" | |
1201 | " map = clock.monotonic.value;\n" | |
1202 | "} := uint27_clock_monotonic_t;\n" | |
1203 | "\n" | |
1204 | "typealias integer {\n" | |
1205 | " size = 32; align = %u; signed = false;\n" | |
1206 | " map = clock.monotonic.value;\n" | |
1207 | "} := uint32_clock_monotonic_t;\n" | |
1208 | "\n" | |
1209 | "typealias integer {\n" | |
1210 | " size = 64; align = %u; signed = false;\n" | |
1211 | " map = clock.monotonic.value;\n" | |
1212 | "} := uint64_clock_monotonic_t;\n\n", | |
1213 | lttng_alignof(uint32_t) * CHAR_BIT, | |
1214 | lttng_alignof(uint64_t) * CHAR_BIT | |
1215 | ); | |
1216 | if (ret) | |
1217 | goto end; | |
1218 | ||
8020ceb5 MD |
1219 | ret = _ltt_stream_packet_context_declare(session); |
1220 | if (ret) | |
1221 | goto end; | |
1222 | ||
1223 | ret = _ltt_event_header_declare(session); | |
1224 | if (ret) | |
1225 | goto end; | |
1226 | ||
1227 | skip_session: | |
b5234c06 | 1228 | cds_list_for_each_entry(chan, &session->chan, list) { |
8020ceb5 MD |
1229 | ret = _ltt_channel_metadata_statedump(session, chan); |
1230 | if (ret) | |
1231 | goto end; | |
1232 | } | |
1233 | ||
b5234c06 | 1234 | cds_list_for_each_entry(event, &session->events, list) { |
8020ceb5 MD |
1235 | ret = _ltt_event_metadata_statedump(session, event->chan, event); |
1236 | if (ret) | |
1237 | goto end; | |
1238 | } | |
1239 | session->metadata_dumped = 1; | |
1240 | end: | |
1241 | return ret; | |
1242 | } | |
1243 | ||
003fedf4 | 1244 | void lttng_ust_events_exit(void) |
8020ceb5 MD |
1245 | { |
1246 | struct ltt_session *session, *tmpsession; | |
1247 | ||
b5234c06 | 1248 | cds_list_for_each_entry_safe(session, tmpsession, &sessions, list) |
8020ceb5 | 1249 | ltt_session_destroy(session); |
8020ceb5 | 1250 | } |
457a6b58 MD |
1251 | |
1252 | /* WILDCARDS */ | |
1253 | ||
1254 | static | |
1255 | int wildcard_same_loglevel(struct wildcard_entry *e, | |
1256 | enum lttng_ust_loglevel_type loglevel_type, | |
1257 | int loglevel) | |
1258 | { | |
1259 | if (e->loglevel_type == loglevel_type && e->loglevel == loglevel) | |
1260 | return 1; | |
1261 | else | |
1262 | return 0; | |
1263 | } | |
1264 | ||
1265 | #if 0 | |
1266 | static | |
1267 | int wildcard_is_within(struct wildcard_entry *e, | |
1268 | enum lttng_ust_loglevel_type loglevel_type, | |
1269 | int loglevel) | |
1270 | { | |
1271 | if (e->loglevel_type == LTTNG_UST_LOGLEVEL_ALL | |
1272 | || e->loglevel == -1) | |
1273 | return 1; | |
1274 | switch (e->loglevel_type) { | |
1275 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1276 | switch (loglevel_type) { | |
1277 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1278 | if (e->loglevel >= loglevel) | |
1279 | return 1; | |
1280 | else | |
1281 | return 0; | |
1282 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1283 | if (e->loglevel <= 0 && loglevel == 0) | |
1284 | return 1; | |
1285 | else | |
1286 | return 0; | |
1287 | } | |
1288 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1289 | switch (loglevel_type) { | |
1290 | case LTTNG_UST_LOGLEVEL_RANGE: | |
1291 | if (loglevel <= 0) | |
1292 | return 1; | |
1293 | else | |
1294 | return 0; | |
1295 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
1296 | if (e->loglevel == loglevel) | |
1297 | return 1; | |
1298 | else | |
1299 | return 0; | |
1300 | } | |
1301 | } | |
1302 | } | |
1303 | #endif | |
1304 | ||
1305 | /* | |
1306 | * Add the wildcard to the wildcard list. Must be called with | |
1307 | * ust lock held. | |
1308 | */ | |
1309 | static | |
1310 | struct session_wildcard *add_wildcard(struct ltt_channel *chan, | |
1311 | struct lttng_ust_event *event_param) | |
1312 | { | |
1313 | struct wildcard_entry *e; | |
1314 | struct session_wildcard *sw; | |
1315 | size_t name_len = strlen(event_param->name) + 1; | |
1316 | int found = 0; | |
1317 | ||
1318 | /* | |
1319 | * Try to find global wildcard entry. Given that this is shared | |
1320 | * across all sessions, we need to check for exact loglevel | |
1321 | * match, not just whether contained within the existing ones. | |
1322 | */ | |
1323 | cds_list_for_each_entry(e, &wildcard_list, list) { | |
1324 | if (!strncmp(event_param->name, e->name, | |
1325 | LTTNG_UST_SYM_NAME_LEN - 1)) { | |
1326 | if (wildcard_same_loglevel(e, | |
1327 | event_param->loglevel_type, | |
1328 | event_param->loglevel)) { | |
1329 | found = 1; | |
1330 | break; | |
1331 | } | |
1332 | } | |
1333 | } | |
1334 | ||
1335 | if (!found) { | |
1336 | /* | |
1337 | * Create global wildcard entry if not found. Using | |
1338 | * zmalloc here to allocate a variable length element. | |
1339 | * Could cause some memory fragmentation if overused. | |
1340 | */ | |
1341 | e = zmalloc(sizeof(struct wildcard_entry) + name_len); | |
1342 | if (!e) | |
1343 | return ERR_PTR(-ENOMEM); | |
1344 | memcpy(&e->name[0], event_param->name, name_len); | |
1345 | cds_list_add(&e->list, &wildcard_list); | |
1346 | CDS_INIT_LIST_HEAD(&e->session_list); | |
1347 | } | |
1348 | ||
1349 | /* session wildcard */ | |
1350 | cds_list_for_each_entry(sw, &e->session_list, session_list) { | |
1351 | if (chan == sw->chan) { | |
1352 | DBG("wildcard %s busy for this channel", | |
1353 | event_param->name); | |
1354 | return ERR_PTR(-EEXIST); /* Already there */ | |
1355 | } | |
1356 | } | |
1357 | sw = zmalloc(sizeof(struct session_wildcard)); | |
1358 | if (!sw) | |
1359 | return ERR_PTR(-ENOMEM); | |
1360 | sw->chan = chan; | |
1361 | sw->enabled = 1; | |
1362 | memcpy(&sw->event_param, event_param, sizeof(sw->event_param)); | |
1363 | sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT; | |
1364 | sw->event_param.loglevel_type = event_param->loglevel_type; | |
1365 | sw->event_param.loglevel = event_param->loglevel; | |
1366 | CDS_INIT_LIST_HEAD(&sw->events); | |
1367 | cds_list_add(&sw->list, &chan->session->wildcards); | |
1368 | cds_list_add(&sw->session_list, &e->session_list); | |
1369 | sw->entry = e; | |
1370 | ltt_probes_create_wildcard_events(e, sw); | |
1371 | return sw; | |
1372 | } | |
1373 | ||
1374 | /* | |
1375 | * Remove the wildcard from the wildcard list. Must be called with | |
1376 | * ust_lock held. Only called at session teardown. | |
1377 | */ | |
1378 | static | |
1379 | void _remove_wildcard(struct session_wildcard *wildcard) | |
1380 | { | |
1381 | struct ltt_event *ev, *tmp; | |
1382 | ||
1383 | /* | |
1384 | * Just remove the events owned (for enable/disable) by this | |
1385 | * wildcard from the list. The session teardown will take care | |
1386 | * of freeing the event memory. | |
1387 | */ | |
1388 | cds_list_for_each_entry_safe(ev, tmp, &wildcard->events, | |
1389 | wildcard_list) { | |
1390 | cds_list_del(&ev->wildcard_list); | |
1391 | } | |
1392 | cds_list_del(&wildcard->session_list); | |
1393 | cds_list_del(&wildcard->list); | |
1394 | if (cds_list_empty(&wildcard->entry->session_list)) { | |
1395 | cds_list_del(&wildcard->entry->list); | |
1396 | free(wildcard->entry); | |
1397 | } | |
1398 | free(wildcard); | |
1399 | } | |
1400 | ||
1401 | int ltt_wildcard_create(struct ltt_channel *chan, | |
1402 | struct lttng_ust_event *event_param, | |
1403 | struct session_wildcard **_sw) | |
1404 | { | |
1405 | struct session_wildcard *sw; | |
1406 | ||
1407 | sw = add_wildcard(chan, event_param); | |
1408 | if (!sw || IS_ERR(sw)) { | |
1409 | return PTR_ERR(sw); | |
1410 | } | |
1411 | *_sw = sw; | |
1412 | return 0; | |
1413 | } | |
1414 | ||
1415 | static | |
1416 | void _ltt_wildcard_destroy(struct session_wildcard *sw) | |
1417 | { | |
1418 | _remove_wildcard(sw); | |
1419 | } | |
1420 | ||
1421 | int ltt_wildcard_enable(struct session_wildcard *wildcard) | |
1422 | { | |
1423 | struct ltt_event *ev; | |
1424 | int ret; | |
1425 | ||
1426 | if (wildcard->enabled) | |
1427 | return -EEXIST; | |
1428 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1429 | ret = ltt_event_enable(ev); | |
1430 | if (ret) { | |
1431 | DBG("Error: enable error.\n"); | |
1432 | return ret; | |
1433 | } | |
1434 | } | |
1435 | wildcard->enabled = 1; | |
1436 | return 0; | |
1437 | } | |
1438 | ||
1439 | int ltt_wildcard_disable(struct session_wildcard *wildcard) | |
1440 | { | |
1441 | struct ltt_event *ev; | |
1442 | int ret; | |
1443 | ||
1444 | if (!wildcard->enabled) | |
1445 | return -EEXIST; | |
1446 | cds_list_for_each_entry(ev, &wildcard->events, wildcard_list) { | |
1447 | ret = ltt_event_disable(ev); | |
1448 | if (ret) { | |
1449 | DBG("Error: disable error.\n"); | |
1450 | return ret; | |
1451 | } | |
1452 | } | |
1453 | wildcard->enabled = 0; | |
1454 | return 0; | |
1455 | } |