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Implement lib counter
[lttng-modules.git] / src / lttng-events.c
1 /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
2 *
3 * lttng-events.c
4 *
5 * Holds LTTng per-session event registry.
6 *
7 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 */
9
10 /*
11 * This page_alloc.h wrapper needs to be included before gfpflags.h because it
12 * overrides a function with a define.
13 */
14 #include "wrapper/page_alloc.h"
15
16 #include <linux/module.h>
17 #include <linux/mutex.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/jiffies.h>
21 #include <linux/utsname.h>
22 #include <linux/err.h>
23 #include <linux/seq_file.h>
24 #include <linux/file.h>
25 #include <linux/anon_inodes.h>
26 #include <wrapper/file.h>
27 #include <linux/uaccess.h>
28 #include <linux/vmalloc.h>
29 #include <linux/dmi.h>
30
31 #include <wrapper/uuid.h>
32 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
33 #include <wrapper/random.h>
34 #include <wrapper/tracepoint.h>
35 #include <wrapper/list.h>
36 #include <wrapper/types.h>
37 #include <lttng/kernel-version.h>
38 #include <lttng/events.h>
39 #include <lttng/lttng-bytecode.h>
40 #include <lttng/tracer.h>
41 #include <lttng/event-notifier-notification.h>
42 #include <lttng/abi-old.h>
43 #include <lttng/endian.h>
44 #include <lttng/string-utils.h>
45 #include <lttng/utils.h>
46 #include <ringbuffer/backend.h>
47 #include <ringbuffer/frontend.h>
48 #include <wrapper/time.h>
49
50 #define METADATA_CACHE_DEFAULT_SIZE 4096
51
52 static LIST_HEAD(sessions);
53 static LIST_HEAD(event_notifier_groups);
54 static LIST_HEAD(lttng_transport_list);
55 static LIST_HEAD(lttng_counter_transport_list);
56 /*
57 * Protect the sessions and metadata caches.
58 */
59 static DEFINE_MUTEX(sessions_mutex);
60 static struct kmem_cache *event_cache;
61 static struct kmem_cache *event_notifier_cache;
62
63 static void lttng_session_lazy_sync_event_enablers(struct lttng_session *session);
64 static void lttng_session_sync_event_enablers(struct lttng_session *session);
65 static void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler);
66 static void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler);
67 static void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group);
68
69 static void _lttng_event_destroy(struct lttng_event *event);
70 static void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier);
71 static void _lttng_channel_destroy(struct lttng_channel *chan);
72 static int _lttng_event_unregister(struct lttng_event *event);
73 static int _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier);
74 static
75 int _lttng_event_metadata_statedump(struct lttng_session *session,
76 struct lttng_channel *chan,
77 struct lttng_event *event);
78 static
79 int _lttng_session_metadata_statedump(struct lttng_session *session);
80 static
81 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
82 static
83 int _lttng_type_statedump(struct lttng_session *session,
84 const struct lttng_type *type,
85 size_t nesting);
86 static
87 int _lttng_field_statedump(struct lttng_session *session,
88 const struct lttng_event_field *field,
89 size_t nesting);
90
91 void synchronize_trace(void)
92 {
93 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
94 synchronize_rcu();
95 #else
96 synchronize_sched();
97 #endif
98
99 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
100 #ifdef CONFIG_PREEMPT_RT_FULL
101 synchronize_rcu();
102 #endif
103 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
104 #ifdef CONFIG_PREEMPT_RT
105 synchronize_rcu();
106 #endif
107 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
108 }
109
110 void lttng_lock_sessions(void)
111 {
112 mutex_lock(&sessions_mutex);
113 }
114
115 void lttng_unlock_sessions(void)
116 {
117 mutex_unlock(&sessions_mutex);
118 }
119
120 static struct lttng_transport *lttng_transport_find(const char *name)
121 {
122 struct lttng_transport *transport;
123
124 list_for_each_entry(transport, &lttng_transport_list, node) {
125 if (!strcmp(transport->name, name))
126 return transport;
127 }
128 return NULL;
129 }
130
131 /*
132 * Called with sessions lock held.
133 */
134 int lttng_session_active(void)
135 {
136 struct lttng_session *iter;
137
138 list_for_each_entry(iter, &sessions, list) {
139 if (iter->active)
140 return 1;
141 }
142 return 0;
143 }
144
145 struct lttng_session *lttng_session_create(void)
146 {
147 struct lttng_session *session;
148 struct lttng_metadata_cache *metadata_cache;
149 int i;
150
151 mutex_lock(&sessions_mutex);
152 session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL);
153 if (!session)
154 goto err;
155 INIT_LIST_HEAD(&session->chan);
156 INIT_LIST_HEAD(&session->events);
157 lttng_guid_gen(&session->uuid);
158
159 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
160 GFP_KERNEL);
161 if (!metadata_cache)
162 goto err_free_session;
163 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
164 if (!metadata_cache->data)
165 goto err_free_cache;
166 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
167 kref_init(&metadata_cache->refcount);
168 mutex_init(&metadata_cache->lock);
169 session->metadata_cache = metadata_cache;
170 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
171 memcpy(&metadata_cache->uuid, &session->uuid,
172 sizeof(metadata_cache->uuid));
173 INIT_LIST_HEAD(&session->enablers_head);
174 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
175 INIT_HLIST_HEAD(&session->events_ht.table[i]);
176 list_add(&session->list, &sessions);
177 session->pid_tracker.session = session;
178 session->pid_tracker.tracker_type = TRACKER_PID;
179 session->vpid_tracker.session = session;
180 session->vpid_tracker.tracker_type = TRACKER_VPID;
181 session->uid_tracker.session = session;
182 session->uid_tracker.tracker_type = TRACKER_UID;
183 session->vuid_tracker.session = session;
184 session->vuid_tracker.tracker_type = TRACKER_VUID;
185 session->gid_tracker.session = session;
186 session->gid_tracker.tracker_type = TRACKER_GID;
187 session->vgid_tracker.session = session;
188 session->vgid_tracker.tracker_type = TRACKER_VGID;
189 mutex_unlock(&sessions_mutex);
190 return session;
191
192 err_free_cache:
193 kfree(metadata_cache);
194 err_free_session:
195 lttng_kvfree(session);
196 err:
197 mutex_unlock(&sessions_mutex);
198 return NULL;
199 }
200
201 struct lttng_event_notifier_group *lttng_event_notifier_group_create(void)
202 {
203 struct lttng_transport *transport = NULL;
204 struct lttng_event_notifier_group *event_notifier_group;
205 const char *transport_name = "relay-event-notifier";
206 size_t subbuf_size = 4096; //TODO
207 size_t num_subbuf = 16; //TODO
208 unsigned int switch_timer_interval = 0;
209 unsigned int read_timer_interval = 0;
210 int i;
211
212 mutex_lock(&sessions_mutex);
213
214 transport = lttng_transport_find(transport_name);
215 if (!transport) {
216 printk(KERN_WARNING "LTTng: transport %s not found\n",
217 transport_name);
218 goto notransport;
219 }
220 if (!try_module_get(transport->owner)) {
221 printk(KERN_WARNING "LTTng: Can't lock transport %s module.\n",
222 transport_name);
223 goto notransport;
224 }
225
226 event_notifier_group = lttng_kvzalloc(sizeof(struct lttng_event_notifier_group),
227 GFP_KERNEL);
228 if (!event_notifier_group)
229 goto nomem;
230
231 /*
232 * Initialize the ring buffer used to store event notifier
233 * notifications.
234 */
235 event_notifier_group->ops = &transport->ops;
236 event_notifier_group->chan = transport->ops.channel_create(
237 transport_name, event_notifier_group, NULL,
238 subbuf_size, num_subbuf, switch_timer_interval,
239 read_timer_interval);
240 if (!event_notifier_group->chan)
241 goto create_error;
242
243 event_notifier_group->transport = transport;
244
245 INIT_LIST_HEAD(&event_notifier_group->enablers_head);
246 INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head);
247 for (i = 0; i < LTTNG_EVENT_NOTIFIER_HT_SIZE; i++)
248 INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]);
249
250 list_add(&event_notifier_group->node, &event_notifier_groups);
251
252 mutex_unlock(&sessions_mutex);
253
254 return event_notifier_group;
255
256 create_error:
257 lttng_kvfree(event_notifier_group);
258 nomem:
259 if (transport)
260 module_put(transport->owner);
261 notransport:
262 mutex_unlock(&sessions_mutex);
263 return NULL;
264 }
265
266 void metadata_cache_destroy(struct kref *kref)
267 {
268 struct lttng_metadata_cache *cache =
269 container_of(kref, struct lttng_metadata_cache, refcount);
270 vfree(cache->data);
271 kfree(cache);
272 }
273
274 void lttng_session_destroy(struct lttng_session *session)
275 {
276 struct lttng_channel *chan, *tmpchan;
277 struct lttng_event *event, *tmpevent;
278 struct lttng_metadata_stream *metadata_stream;
279 struct lttng_event_enabler *event_enabler, *tmp_event_enabler;
280 int ret;
281
282 mutex_lock(&sessions_mutex);
283 WRITE_ONCE(session->active, 0);
284 list_for_each_entry(chan, &session->chan, list) {
285 ret = lttng_syscalls_unregister_event(chan);
286 WARN_ON(ret);
287 }
288 list_for_each_entry(event, &session->events, list) {
289 ret = _lttng_event_unregister(event);
290 WARN_ON(ret);
291 }
292 synchronize_trace(); /* Wait for in-flight events to complete */
293 list_for_each_entry(chan, &session->chan, list) {
294 ret = lttng_syscalls_destroy_event(chan);
295 WARN_ON(ret);
296 }
297 list_for_each_entry_safe(event_enabler, tmp_event_enabler,
298 &session->enablers_head, node)
299 lttng_event_enabler_destroy(event_enabler);
300 list_for_each_entry_safe(event, tmpevent, &session->events, list)
301 _lttng_event_destroy(event);
302 list_for_each_entry_safe(chan, tmpchan, &session->chan, list) {
303 BUG_ON(chan->channel_type == METADATA_CHANNEL);
304 _lttng_channel_destroy(chan);
305 }
306 mutex_lock(&session->metadata_cache->lock);
307 list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list)
308 _lttng_metadata_channel_hangup(metadata_stream);
309 mutex_unlock(&session->metadata_cache->lock);
310 lttng_id_tracker_destroy(&session->pid_tracker, false);
311 lttng_id_tracker_destroy(&session->vpid_tracker, false);
312 lttng_id_tracker_destroy(&session->uid_tracker, false);
313 lttng_id_tracker_destroy(&session->vuid_tracker, false);
314 lttng_id_tracker_destroy(&session->gid_tracker, false);
315 lttng_id_tracker_destroy(&session->vgid_tracker, false);
316 kref_put(&session->metadata_cache->refcount, metadata_cache_destroy);
317 list_del(&session->list);
318 mutex_unlock(&sessions_mutex);
319 lttng_kvfree(session);
320 }
321
322 void lttng_event_notifier_group_destroy(
323 struct lttng_event_notifier_group *event_notifier_group)
324 {
325 struct lttng_event_notifier_enabler *event_notifier_enabler, *tmp_event_notifier_enabler;
326 struct lttng_event_notifier *event_notifier, *tmpevent_notifier;
327 int ret;
328
329 if (!event_notifier_group)
330 return;
331
332 mutex_lock(&sessions_mutex);
333
334 ret = lttng_syscalls_unregister_event_notifier(event_notifier_group);
335 WARN_ON(ret);
336
337 list_for_each_entry_safe(event_notifier, tmpevent_notifier,
338 &event_notifier_group->event_notifiers_head, list) {
339 ret = _lttng_event_notifier_unregister(event_notifier);
340 WARN_ON(ret);
341 }
342
343 /* Wait for in-flight event notifier to complete */
344 synchronize_trace();
345
346 irq_work_sync(&event_notifier_group->wakeup_pending);
347
348 kfree(event_notifier_group->sc_filter);
349
350 list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
351 &event_notifier_group->enablers_head, node)
352 lttng_event_notifier_enabler_destroy(event_notifier_enabler);
353
354 list_for_each_entry_safe(event_notifier, tmpevent_notifier,
355 &event_notifier_group->event_notifiers_head, list)
356 _lttng_event_notifier_destroy(event_notifier);
357
358 event_notifier_group->ops->channel_destroy(event_notifier_group->chan);
359 module_put(event_notifier_group->transport->owner);
360 list_del(&event_notifier_group->node);
361
362 mutex_unlock(&sessions_mutex);
363 lttng_kvfree(event_notifier_group);
364 }
365
366 int lttng_session_statedump(struct lttng_session *session)
367 {
368 int ret;
369
370 mutex_lock(&sessions_mutex);
371 ret = lttng_statedump_start(session);
372 mutex_unlock(&sessions_mutex);
373 return ret;
374 }
375
376 int lttng_session_enable(struct lttng_session *session)
377 {
378 int ret = 0;
379 struct lttng_channel *chan;
380
381 mutex_lock(&sessions_mutex);
382 if (session->active) {
383 ret = -EBUSY;
384 goto end;
385 }
386
387 /* Set transient enabler state to "enabled" */
388 session->tstate = 1;
389
390 /* We need to sync enablers with session before activation. */
391 lttng_session_sync_event_enablers(session);
392
393 /*
394 * Snapshot the number of events per channel to know the type of header
395 * we need to use.
396 */
397 list_for_each_entry(chan, &session->chan, list) {
398 if (chan->header_type)
399 continue; /* don't change it if session stop/restart */
400 if (chan->free_event_id < 31)
401 chan->header_type = 1; /* compact */
402 else
403 chan->header_type = 2; /* large */
404 }
405
406 /* Clear each stream's quiescent state. */
407 list_for_each_entry(chan, &session->chan, list) {
408 if (chan->channel_type != METADATA_CHANNEL)
409 lib_ring_buffer_clear_quiescent_channel(chan->chan);
410 }
411
412 WRITE_ONCE(session->active, 1);
413 WRITE_ONCE(session->been_active, 1);
414 ret = _lttng_session_metadata_statedump(session);
415 if (ret) {
416 WRITE_ONCE(session->active, 0);
417 goto end;
418 }
419 ret = lttng_statedump_start(session);
420 if (ret)
421 WRITE_ONCE(session->active, 0);
422 end:
423 mutex_unlock(&sessions_mutex);
424 return ret;
425 }
426
427 int lttng_session_disable(struct lttng_session *session)
428 {
429 int ret = 0;
430 struct lttng_channel *chan;
431
432 mutex_lock(&sessions_mutex);
433 if (!session->active) {
434 ret = -EBUSY;
435 goto end;
436 }
437 WRITE_ONCE(session->active, 0);
438
439 /* Set transient enabler state to "disabled" */
440 session->tstate = 0;
441 lttng_session_sync_event_enablers(session);
442
443 /* Set each stream's quiescent state. */
444 list_for_each_entry(chan, &session->chan, list) {
445 if (chan->channel_type != METADATA_CHANNEL)
446 lib_ring_buffer_set_quiescent_channel(chan->chan);
447 }
448 end:
449 mutex_unlock(&sessions_mutex);
450 return ret;
451 }
452
453 int lttng_session_metadata_regenerate(struct lttng_session *session)
454 {
455 int ret = 0;
456 struct lttng_channel *chan;
457 struct lttng_event *event;
458 struct lttng_metadata_cache *cache = session->metadata_cache;
459 struct lttng_metadata_stream *stream;
460
461 mutex_lock(&sessions_mutex);
462 if (!session->active) {
463 ret = -EBUSY;
464 goto end;
465 }
466
467 mutex_lock(&cache->lock);
468 memset(cache->data, 0, cache->cache_alloc);
469 cache->metadata_written = 0;
470 cache->version++;
471 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) {
472 stream->metadata_out = 0;
473 stream->metadata_in = 0;
474 }
475 mutex_unlock(&cache->lock);
476
477 session->metadata_dumped = 0;
478 list_for_each_entry(chan, &session->chan, list) {
479 chan->metadata_dumped = 0;
480 }
481
482 list_for_each_entry(event, &session->events, list) {
483 event->metadata_dumped = 0;
484 }
485
486 ret = _lttng_session_metadata_statedump(session);
487
488 end:
489 mutex_unlock(&sessions_mutex);
490 return ret;
491 }
492
493 int lttng_channel_enable(struct lttng_channel *channel)
494 {
495 int ret = 0;
496
497 mutex_lock(&sessions_mutex);
498 if (channel->channel_type == METADATA_CHANNEL) {
499 ret = -EPERM;
500 goto end;
501 }
502 if (channel->enabled) {
503 ret = -EEXIST;
504 goto end;
505 }
506 /* Set transient enabler state to "enabled" */
507 channel->tstate = 1;
508 lttng_session_sync_event_enablers(channel->session);
509 /* Set atomically the state to "enabled" */
510 WRITE_ONCE(channel->enabled, 1);
511 end:
512 mutex_unlock(&sessions_mutex);
513 return ret;
514 }
515
516 int lttng_channel_disable(struct lttng_channel *channel)
517 {
518 int ret = 0;
519
520 mutex_lock(&sessions_mutex);
521 if (channel->channel_type == METADATA_CHANNEL) {
522 ret = -EPERM;
523 goto end;
524 }
525 if (!channel->enabled) {
526 ret = -EEXIST;
527 goto end;
528 }
529 /* Set atomically the state to "disabled" */
530 WRITE_ONCE(channel->enabled, 0);
531 /* Set transient enabler state to "enabled" */
532 channel->tstate = 0;
533 lttng_session_sync_event_enablers(channel->session);
534 end:
535 mutex_unlock(&sessions_mutex);
536 return ret;
537 }
538
539 int lttng_event_enable(struct lttng_event *event)
540 {
541 int ret = 0;
542
543 mutex_lock(&sessions_mutex);
544 if (event->chan->channel_type == METADATA_CHANNEL) {
545 ret = -EPERM;
546 goto end;
547 }
548 if (event->enabled) {
549 ret = -EEXIST;
550 goto end;
551 }
552 switch (event->instrumentation) {
553 case LTTNG_KERNEL_TRACEPOINT:
554 case LTTNG_KERNEL_SYSCALL:
555 ret = -EINVAL;
556 break;
557 case LTTNG_KERNEL_KPROBE:
558 case LTTNG_KERNEL_UPROBE:
559 case LTTNG_KERNEL_NOOP:
560 WRITE_ONCE(event->enabled, 1);
561 break;
562 case LTTNG_KERNEL_KRETPROBE:
563 ret = lttng_kretprobes_event_enable_state(event, 1);
564 break;
565 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
566 default:
567 WARN_ON_ONCE(1);
568 ret = -EINVAL;
569 }
570 end:
571 mutex_unlock(&sessions_mutex);
572 return ret;
573 }
574
575 int lttng_event_disable(struct lttng_event *event)
576 {
577 int ret = 0;
578
579 mutex_lock(&sessions_mutex);
580 if (event->chan->channel_type == METADATA_CHANNEL) {
581 ret = -EPERM;
582 goto end;
583 }
584 if (!event->enabled) {
585 ret = -EEXIST;
586 goto end;
587 }
588 switch (event->instrumentation) {
589 case LTTNG_KERNEL_TRACEPOINT:
590 case LTTNG_KERNEL_SYSCALL:
591 ret = -EINVAL;
592 break;
593 case LTTNG_KERNEL_KPROBE:
594 case LTTNG_KERNEL_UPROBE:
595 case LTTNG_KERNEL_NOOP:
596 WRITE_ONCE(event->enabled, 0);
597 break;
598 case LTTNG_KERNEL_KRETPROBE:
599 ret = lttng_kretprobes_event_enable_state(event, 0);
600 break;
601 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
602 default:
603 WARN_ON_ONCE(1);
604 ret = -EINVAL;
605 }
606 end:
607 mutex_unlock(&sessions_mutex);
608 return ret;
609 }
610
611 int lttng_event_notifier_enable(struct lttng_event_notifier *event_notifier)
612 {
613 int ret = 0;
614
615 mutex_lock(&sessions_mutex);
616 if (event_notifier->enabled) {
617 ret = -EEXIST;
618 goto end;
619 }
620 switch (event_notifier->instrumentation) {
621 case LTTNG_KERNEL_TRACEPOINT:
622 case LTTNG_KERNEL_SYSCALL:
623 ret = -EINVAL;
624 break;
625 case LTTNG_KERNEL_KPROBE:
626 case LTTNG_KERNEL_UPROBE:
627 WRITE_ONCE(event_notifier->enabled, 1);
628 break;
629 case LTTNG_KERNEL_FUNCTION:
630 case LTTNG_KERNEL_NOOP:
631 case LTTNG_KERNEL_KRETPROBE:
632 default:
633 WARN_ON_ONCE(1);
634 ret = -EINVAL;
635 }
636 end:
637 mutex_unlock(&sessions_mutex);
638 return ret;
639 }
640
641 int lttng_event_notifier_disable(struct lttng_event_notifier *event_notifier)
642 {
643 int ret = 0;
644
645 mutex_lock(&sessions_mutex);
646 if (!event_notifier->enabled) {
647 ret = -EEXIST;
648 goto end;
649 }
650 switch (event_notifier->instrumentation) {
651 case LTTNG_KERNEL_TRACEPOINT:
652 case LTTNG_KERNEL_SYSCALL:
653 ret = -EINVAL;
654 break;
655 case LTTNG_KERNEL_KPROBE:
656 case LTTNG_KERNEL_UPROBE:
657 WRITE_ONCE(event_notifier->enabled, 0);
658 break;
659 case LTTNG_KERNEL_FUNCTION:
660 case LTTNG_KERNEL_NOOP:
661 case LTTNG_KERNEL_KRETPROBE:
662 default:
663 WARN_ON_ONCE(1);
664 ret = -EINVAL;
665 }
666 end:
667 mutex_unlock(&sessions_mutex);
668 return ret;
669 }
670
671 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
672 const char *transport_name,
673 void *buf_addr,
674 size_t subbuf_size, size_t num_subbuf,
675 unsigned int switch_timer_interval,
676 unsigned int read_timer_interval,
677 enum channel_type channel_type)
678 {
679 struct lttng_channel *chan;
680 struct lttng_transport *transport = NULL;
681
682 mutex_lock(&sessions_mutex);
683 if (session->been_active && channel_type != METADATA_CHANNEL)
684 goto active; /* Refuse to add channel to active session */
685 transport = lttng_transport_find(transport_name);
686 if (!transport) {
687 printk(KERN_WARNING "LTTng: transport %s not found\n",
688 transport_name);
689 goto notransport;
690 }
691 if (!try_module_get(transport->owner)) {
692 printk(KERN_WARNING "LTTng: Can't lock transport module.\n");
693 goto notransport;
694 }
695 chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL);
696 if (!chan)
697 goto nomem;
698 chan->session = session;
699 chan->id = session->free_chan_id++;
700 chan->ops = &transport->ops;
701 /*
702 * Note: the channel creation op already writes into the packet
703 * headers. Therefore the "chan" information used as input
704 * should be already accessible.
705 */
706 chan->chan = transport->ops.channel_create(transport_name,
707 chan, buf_addr, subbuf_size, num_subbuf,
708 switch_timer_interval, read_timer_interval);
709 if (!chan->chan)
710 goto create_error;
711 chan->tstate = 1;
712 chan->enabled = 1;
713 chan->transport = transport;
714 chan->channel_type = channel_type;
715 list_add(&chan->list, &session->chan);
716 mutex_unlock(&sessions_mutex);
717 return chan;
718
719 create_error:
720 kfree(chan);
721 nomem:
722 if (transport)
723 module_put(transport->owner);
724 notransport:
725 active:
726 mutex_unlock(&sessions_mutex);
727 return NULL;
728 }
729
730 /*
731 * Only used internally at session destruction for per-cpu channels, and
732 * when metadata channel is released.
733 * Needs to be called with sessions mutex held.
734 */
735 static
736 void _lttng_channel_destroy(struct lttng_channel *chan)
737 {
738 chan->ops->channel_destroy(chan->chan);
739 module_put(chan->transport->owner);
740 list_del(&chan->list);
741 lttng_destroy_context(chan->ctx);
742 kfree(chan);
743 }
744
745 void lttng_metadata_channel_destroy(struct lttng_channel *chan)
746 {
747 BUG_ON(chan->channel_type != METADATA_CHANNEL);
748
749 /* Protect the metadata cache with the sessions_mutex. */
750 mutex_lock(&sessions_mutex);
751 _lttng_channel_destroy(chan);
752 mutex_unlock(&sessions_mutex);
753 }
754 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
755
756 static
757 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
758 {
759 stream->finalized = 1;
760 wake_up_interruptible(&stream->read_wait);
761 }
762
763 static
764 struct lttng_counter_transport *lttng_counter_transport_find(const char *name)
765 {
766 struct lttng_counter_transport *transport;
767
768 list_for_each_entry(transport, &lttng_counter_transport_list, node) {
769 if (!strcmp(transport->name, name))
770 return transport;
771 }
772 return NULL;
773 }
774
775 /*
776 * Supports event creation while tracing session is active.
777 * Needs to be called with sessions mutex held.
778 */
779 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
780 struct lttng_kernel_event *event_param,
781 void *filter,
782 const struct lttng_event_desc *event_desc,
783 enum lttng_kernel_instrumentation itype)
784 {
785 struct lttng_session *session = chan->session;
786 struct lttng_event *event;
787 const char *event_name;
788 struct hlist_head *head;
789 int ret;
790
791 if (chan->free_event_id == -1U) {
792 ret = -EMFILE;
793 goto full;
794 }
795
796 switch (itype) {
797 case LTTNG_KERNEL_TRACEPOINT:
798 event_name = event_desc->name;
799 break;
800 case LTTNG_KERNEL_KPROBE:
801 case LTTNG_KERNEL_UPROBE:
802 case LTTNG_KERNEL_KRETPROBE:
803 case LTTNG_KERNEL_NOOP:
804 case LTTNG_KERNEL_SYSCALL:
805 event_name = event_param->name;
806 break;
807 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
808 default:
809 WARN_ON_ONCE(1);
810 ret = -EINVAL;
811 goto type_error;
812 }
813
814 head = utils_borrow_hash_table_bucket(session->events_ht.table,
815 LTTNG_EVENT_HT_SIZE, event_name);
816 lttng_hlist_for_each_entry(event, head, hlist) {
817 WARN_ON_ONCE(!event->desc);
818 if (!strncmp(event->desc->name, event_name,
819 LTTNG_KERNEL_SYM_NAME_LEN - 1)
820 && chan == event->chan) {
821 ret = -EEXIST;
822 goto exist;
823 }
824 }
825
826 event = kmem_cache_zalloc(event_cache, GFP_KERNEL);
827 if (!event) {
828 ret = -ENOMEM;
829 goto cache_error;
830 }
831 event->chan = chan;
832 event->filter = filter;
833 event->id = chan->free_event_id++;
834 event->instrumentation = itype;
835 event->evtype = LTTNG_TYPE_EVENT;
836 INIT_LIST_HEAD(&event->filter_bytecode_runtime_head);
837 INIT_LIST_HEAD(&event->enablers_ref_head);
838
839 switch (itype) {
840 case LTTNG_KERNEL_TRACEPOINT:
841 /* Event will be enabled by enabler sync. */
842 event->enabled = 0;
843 event->registered = 0;
844 event->desc = lttng_event_desc_get(event_name);
845 if (!event->desc) {
846 ret = -ENOENT;
847 goto register_error;
848 }
849 /* Populate lttng_event structure before event registration. */
850 smp_wmb();
851 break;
852 case LTTNG_KERNEL_KPROBE:
853 /*
854 * Needs to be explicitly enabled after creation, since
855 * we may want to apply filters.
856 */
857 event->enabled = 0;
858 event->registered = 1;
859 /*
860 * Populate lttng_event structure before event
861 * registration.
862 */
863 smp_wmb();
864 ret = lttng_kprobes_register_event(event_name,
865 event_param->u.kprobe.symbol_name,
866 event_param->u.kprobe.offset,
867 event_param->u.kprobe.addr,
868 event);
869 if (ret) {
870 ret = -EINVAL;
871 goto register_error;
872 }
873 ret = try_module_get(event->desc->owner);
874 WARN_ON_ONCE(!ret);
875 break;
876 case LTTNG_KERNEL_KRETPROBE:
877 {
878 struct lttng_event *event_return;
879
880 /* kretprobe defines 2 events */
881 /*
882 * Needs to be explicitly enabled after creation, since
883 * we may want to apply filters.
884 */
885 event->enabled = 0;
886 event->registered = 1;
887 event_return =
888 kmem_cache_zalloc(event_cache, GFP_KERNEL);
889 if (!event_return) {
890 ret = -ENOMEM;
891 goto register_error;
892 }
893 event_return->chan = chan;
894 event_return->filter = filter;
895 event_return->id = chan->free_event_id++;
896 event_return->enabled = 0;
897 event_return->registered = 1;
898 event_return->instrumentation = itype;
899 /*
900 * Populate lttng_event structure before kretprobe registration.
901 */
902 smp_wmb();
903 ret = lttng_kretprobes_register(event_name,
904 event_param->u.kretprobe.symbol_name,
905 event_param->u.kretprobe.offset,
906 event_param->u.kretprobe.addr,
907 event, event_return);
908 if (ret) {
909 kmem_cache_free(event_cache, event_return);
910 ret = -EINVAL;
911 goto register_error;
912 }
913 /* Take 2 refs on the module: one per event. */
914 ret = try_module_get(event->desc->owner);
915 WARN_ON_ONCE(!ret);
916 ret = try_module_get(event->desc->owner);
917 WARN_ON_ONCE(!ret);
918 ret = _lttng_event_metadata_statedump(chan->session, chan,
919 event_return);
920 WARN_ON_ONCE(ret > 0);
921 if (ret) {
922 kmem_cache_free(event_cache, event_return);
923 module_put(event->desc->owner);
924 module_put(event->desc->owner);
925 goto statedump_error;
926 }
927 list_add(&event_return->list, &chan->session->events);
928 break;
929 }
930 case LTTNG_KERNEL_NOOP:
931 case LTTNG_KERNEL_SYSCALL:
932 /*
933 * Needs to be explicitly enabled after creation, since
934 * we may want to apply filters.
935 */
936 event->enabled = 0;
937 event->registered = 0;
938 event->desc = event_desc;
939 switch (event_param->u.syscall.entryexit) {
940 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
941 ret = -EINVAL;
942 goto register_error;
943 case LTTNG_KERNEL_SYSCALL_ENTRY:
944 event->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
945 break;
946 case LTTNG_KERNEL_SYSCALL_EXIT:
947 event->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
948 break;
949 }
950 switch (event_param->u.syscall.abi) {
951 case LTTNG_KERNEL_SYSCALL_ABI_ALL:
952 ret = -EINVAL;
953 goto register_error;
954 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
955 event->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
956 break;
957 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
958 event->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
959 break;
960 }
961 if (!event->desc) {
962 ret = -EINVAL;
963 goto register_error;
964 }
965 break;
966 case LTTNG_KERNEL_UPROBE:
967 /*
968 * Needs to be explicitly enabled after creation, since
969 * we may want to apply filters.
970 */
971 event->enabled = 0;
972 event->registered = 1;
973
974 /*
975 * Populate lttng_event structure before event
976 * registration.
977 */
978 smp_wmb();
979
980 ret = lttng_uprobes_register_event(event_param->name,
981 event_param->u.uprobe.fd,
982 event);
983 if (ret)
984 goto register_error;
985 ret = try_module_get(event->desc->owner);
986 WARN_ON_ONCE(!ret);
987 break;
988 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
989 default:
990 WARN_ON_ONCE(1);
991 ret = -EINVAL;
992 goto register_error;
993 }
994 ret = _lttng_event_metadata_statedump(chan->session, chan, event);
995 WARN_ON_ONCE(ret > 0);
996 if (ret) {
997 goto statedump_error;
998 }
999 hlist_add_head(&event->hlist, head);
1000 list_add(&event->list, &chan->session->events);
1001 return event;
1002
1003 statedump_error:
1004 /* If a statedump error occurs, events will not be readable. */
1005 register_error:
1006 kmem_cache_free(event_cache, event);
1007 cache_error:
1008 exist:
1009 type_error:
1010 full:
1011 return ERR_PTR(ret);
1012 }
1013
1014 struct lttng_event_notifier *_lttng_event_notifier_create(
1015 const struct lttng_event_desc *event_desc,
1016 uint64_t token, struct lttng_event_notifier_group *event_notifier_group,
1017 struct lttng_kernel_event_notifier *event_notifier_param,
1018 void *filter, enum lttng_kernel_instrumentation itype)
1019 {
1020 struct lttng_event_notifier *event_notifier;
1021 const char *event_name;
1022 struct hlist_head *head;
1023 int ret;
1024
1025 switch (itype) {
1026 case LTTNG_KERNEL_TRACEPOINT:
1027 event_name = event_desc->name;
1028 break;
1029 case LTTNG_KERNEL_KPROBE:
1030 case LTTNG_KERNEL_UPROBE:
1031 case LTTNG_KERNEL_SYSCALL:
1032 event_name = event_notifier_param->event.name;
1033 break;
1034 case LTTNG_KERNEL_KRETPROBE:
1035 case LTTNG_KERNEL_FUNCTION:
1036 case LTTNG_KERNEL_NOOP:
1037 default:
1038 WARN_ON_ONCE(1);
1039 ret = -EINVAL;
1040 goto type_error;
1041 }
1042
1043 head = utils_borrow_hash_table_bucket(event_notifier_group->event_notifiers_ht.table,
1044 LTTNG_EVENT_NOTIFIER_HT_SIZE, event_name);
1045 lttng_hlist_for_each_entry(event_notifier, head, hlist) {
1046 WARN_ON_ONCE(!event_notifier->desc);
1047 if (!strncmp(event_notifier->desc->name, event_name,
1048 LTTNG_KERNEL_SYM_NAME_LEN - 1)
1049 && event_notifier_group == event_notifier->group
1050 && token == event_notifier->user_token) {
1051 ret = -EEXIST;
1052 goto exist;
1053 }
1054 }
1055
1056 event_notifier = kmem_cache_zalloc(event_notifier_cache, GFP_KERNEL);
1057 if (!event_notifier) {
1058 ret = -ENOMEM;
1059 goto cache_error;
1060 }
1061
1062 event_notifier->group = event_notifier_group;
1063 event_notifier->user_token = token;
1064 event_notifier->num_captures = 0;
1065 event_notifier->filter = filter;
1066 event_notifier->instrumentation = itype;
1067 event_notifier->evtype = LTTNG_TYPE_EVENT;
1068 event_notifier->send_notification = lttng_event_notifier_notification_send;
1069 INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head);
1070 INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head);
1071 INIT_LIST_HEAD(&event_notifier->enablers_ref_head);
1072
1073 switch (itype) {
1074 case LTTNG_KERNEL_TRACEPOINT:
1075 /* Event will be enabled by enabler sync. */
1076 event_notifier->enabled = 0;
1077 event_notifier->registered = 0;
1078 event_notifier->desc = lttng_event_desc_get(event_name);
1079 if (!event_notifier->desc) {
1080 ret = -ENOENT;
1081 goto register_error;
1082 }
1083 /* Populate lttng_event_notifier structure before event registration. */
1084 smp_wmb();
1085 break;
1086 case LTTNG_KERNEL_KPROBE:
1087 /*
1088 * Needs to be explicitly enabled after creation, since
1089 * we may want to apply filters.
1090 */
1091 event_notifier->enabled = 0;
1092 event_notifier->registered = 1;
1093 /*
1094 * Populate lttng_event_notifier structure before event
1095 * registration.
1096 */
1097 smp_wmb();
1098 ret = lttng_kprobes_register_event_notifier(
1099 event_notifier_param->event.u.kprobe.symbol_name,
1100 event_notifier_param->event.u.kprobe.offset,
1101 event_notifier_param->event.u.kprobe.addr,
1102 event_notifier);
1103 if (ret) {
1104 ret = -EINVAL;
1105 goto register_error;
1106 }
1107 ret = try_module_get(event_notifier->desc->owner);
1108 WARN_ON_ONCE(!ret);
1109 break;
1110 case LTTNG_KERNEL_NOOP:
1111 case LTTNG_KERNEL_SYSCALL:
1112 /*
1113 * Needs to be explicitly enabled after creation, since
1114 * we may want to apply filters.
1115 */
1116 event_notifier->enabled = 0;
1117 event_notifier->registered = 0;
1118 event_notifier->desc = event_desc;
1119 switch (event_notifier_param->event.u.syscall.entryexit) {
1120 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
1121 ret = -EINVAL;
1122 goto register_error;
1123 case LTTNG_KERNEL_SYSCALL_ENTRY:
1124 event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
1125 break;
1126 case LTTNG_KERNEL_SYSCALL_EXIT:
1127 event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
1128 break;
1129 }
1130 switch (event_notifier_param->event.u.syscall.abi) {
1131 case LTTNG_KERNEL_SYSCALL_ABI_ALL:
1132 ret = -EINVAL;
1133 goto register_error;
1134 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
1135 event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
1136 break;
1137 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
1138 event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
1139 break;
1140 }
1141
1142 if (!event_notifier->desc) {
1143 ret = -EINVAL;
1144 goto register_error;
1145 }
1146 break;
1147 case LTTNG_KERNEL_UPROBE:
1148 /*
1149 * Needs to be explicitly enabled after creation, since
1150 * we may want to apply filters.
1151 */
1152 event_notifier->enabled = 0;
1153 event_notifier->registered = 1;
1154
1155 /*
1156 * Populate lttng_event_notifier structure before
1157 * event_notifier registration.
1158 */
1159 smp_wmb();
1160
1161 ret = lttng_uprobes_register_event_notifier(
1162 event_notifier_param->event.name,
1163 event_notifier_param->event.u.uprobe.fd,
1164 event_notifier);
1165 if (ret)
1166 goto register_error;
1167 ret = try_module_get(event_notifier->desc->owner);
1168 WARN_ON_ONCE(!ret);
1169 break;
1170 case LTTNG_KERNEL_KRETPROBE:
1171 case LTTNG_KERNEL_FUNCTION:
1172 default:
1173 WARN_ON_ONCE(1);
1174 ret = -EINVAL;
1175 goto register_error;
1176 }
1177
1178 list_add(&event_notifier->list, &event_notifier_group->event_notifiers_head);
1179 hlist_add_head(&event_notifier->hlist, head);
1180 return event_notifier;
1181
1182 register_error:
1183 kmem_cache_free(event_notifier_cache, event_notifier);
1184 cache_error:
1185 exist:
1186 type_error:
1187 return ERR_PTR(ret);
1188 }
1189
1190 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
1191 struct lttng_kernel_event *event_param,
1192 void *filter,
1193 const struct lttng_event_desc *event_desc,
1194 enum lttng_kernel_instrumentation itype)
1195 {
1196 struct lttng_event *event;
1197
1198 mutex_lock(&sessions_mutex);
1199 event = _lttng_event_create(chan, event_param, filter, event_desc,
1200 itype);
1201 mutex_unlock(&sessions_mutex);
1202 return event;
1203 }
1204
1205 struct lttng_event_notifier *lttng_event_notifier_create(
1206 const struct lttng_event_desc *event_desc,
1207 uint64_t id, struct lttng_event_notifier_group *event_notifier_group,
1208 struct lttng_kernel_event_notifier *event_notifier_param,
1209 void *filter, enum lttng_kernel_instrumentation itype)
1210 {
1211 struct lttng_event_notifier *event_notifier;
1212
1213 mutex_lock(&sessions_mutex);
1214 event_notifier = _lttng_event_notifier_create(event_desc, id,
1215 event_notifier_group, event_notifier_param, filter, itype);
1216 mutex_unlock(&sessions_mutex);
1217 return event_notifier;
1218 }
1219
1220 /* Only used for tracepoints for now. */
1221 static
1222 void register_event(struct lttng_event *event)
1223 {
1224 const struct lttng_event_desc *desc;
1225 int ret = -EINVAL;
1226
1227 if (event->registered)
1228 return;
1229
1230 desc = event->desc;
1231 switch (event->instrumentation) {
1232 case LTTNG_KERNEL_TRACEPOINT:
1233 ret = lttng_wrapper_tracepoint_probe_register(desc->kname,
1234 desc->probe_callback,
1235 event);
1236 break;
1237 case LTTNG_KERNEL_SYSCALL:
1238 ret = lttng_syscall_filter_enable_event(event->chan, event);
1239 break;
1240 case LTTNG_KERNEL_KPROBE:
1241 case LTTNG_KERNEL_UPROBE:
1242 case LTTNG_KERNEL_KRETPROBE:
1243 case LTTNG_KERNEL_NOOP:
1244 ret = 0;
1245 break;
1246 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
1247 default:
1248 WARN_ON_ONCE(1);
1249 }
1250 if (!ret)
1251 event->registered = 1;
1252 }
1253
1254 /*
1255 * Only used internally at session destruction.
1256 */
1257 int _lttng_event_unregister(struct lttng_event *event)
1258 {
1259 const struct lttng_event_desc *desc;
1260 int ret = -EINVAL;
1261
1262 if (!event->registered)
1263 return 0;
1264
1265 desc = event->desc;
1266 switch (event->instrumentation) {
1267 case LTTNG_KERNEL_TRACEPOINT:
1268 ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname,
1269 event->desc->probe_callback,
1270 event);
1271 break;
1272 case LTTNG_KERNEL_KPROBE:
1273 lttng_kprobes_unregister_event(event);
1274 ret = 0;
1275 break;
1276 case LTTNG_KERNEL_KRETPROBE:
1277 lttng_kretprobes_unregister(event);
1278 ret = 0;
1279 break;
1280 case LTTNG_KERNEL_SYSCALL:
1281 ret = lttng_syscall_filter_disable_event(event->chan, event);
1282 break;
1283 case LTTNG_KERNEL_NOOP:
1284 ret = 0;
1285 break;
1286 case LTTNG_KERNEL_UPROBE:
1287 lttng_uprobes_unregister_event(event);
1288 ret = 0;
1289 break;
1290 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
1291 default:
1292 WARN_ON_ONCE(1);
1293 }
1294 if (!ret)
1295 event->registered = 0;
1296 return ret;
1297 }
1298
1299 /* Only used for tracepoints for now. */
1300 static
1301 void register_event_notifier(struct lttng_event_notifier *event_notifier)
1302 {
1303 const struct lttng_event_desc *desc;
1304 int ret = -EINVAL;
1305
1306 if (event_notifier->registered)
1307 return;
1308
1309 desc = event_notifier->desc;
1310 switch (event_notifier->instrumentation) {
1311 case LTTNG_KERNEL_TRACEPOINT:
1312 ret = lttng_wrapper_tracepoint_probe_register(desc->kname,
1313 desc->event_notifier_callback,
1314 event_notifier);
1315 break;
1316 case LTTNG_KERNEL_SYSCALL:
1317 ret = lttng_syscall_filter_enable_event_notifier(event_notifier);
1318 break;
1319 case LTTNG_KERNEL_KPROBE:
1320 case LTTNG_KERNEL_UPROBE:
1321 ret = 0;
1322 break;
1323 case LTTNG_KERNEL_KRETPROBE:
1324 case LTTNG_KERNEL_FUNCTION:
1325 case LTTNG_KERNEL_NOOP:
1326 default:
1327 WARN_ON_ONCE(1);
1328 }
1329 if (!ret)
1330 event_notifier->registered = 1;
1331 }
1332
1333 static
1334 int _lttng_event_notifier_unregister(
1335 struct lttng_event_notifier *event_notifier)
1336 {
1337 const struct lttng_event_desc *desc;
1338 int ret = -EINVAL;
1339
1340 if (!event_notifier->registered)
1341 return 0;
1342
1343 desc = event_notifier->desc;
1344 switch (event_notifier->instrumentation) {
1345 case LTTNG_KERNEL_TRACEPOINT:
1346 ret = lttng_wrapper_tracepoint_probe_unregister(event_notifier->desc->kname,
1347 event_notifier->desc->event_notifier_callback,
1348 event_notifier);
1349 break;
1350 case LTTNG_KERNEL_KPROBE:
1351 lttng_kprobes_unregister_event_notifier(event_notifier);
1352 ret = 0;
1353 break;
1354 case LTTNG_KERNEL_UPROBE:
1355 lttng_uprobes_unregister_event_notifier(event_notifier);
1356 ret = 0;
1357 break;
1358 case LTTNG_KERNEL_SYSCALL:
1359 ret = lttng_syscall_filter_disable_event_notifier(event_notifier);
1360 break;
1361 case LTTNG_KERNEL_KRETPROBE:
1362 case LTTNG_KERNEL_FUNCTION:
1363 case LTTNG_KERNEL_NOOP:
1364 default:
1365 WARN_ON_ONCE(1);
1366 }
1367 if (!ret)
1368 event_notifier->registered = 0;
1369 return ret;
1370 }
1371
1372 /*
1373 * Only used internally at session destruction.
1374 */
1375 static
1376 void _lttng_event_destroy(struct lttng_event *event)
1377 {
1378 switch (event->instrumentation) {
1379 case LTTNG_KERNEL_TRACEPOINT:
1380 lttng_event_desc_put(event->desc);
1381 break;
1382 case LTTNG_KERNEL_KPROBE:
1383 module_put(event->desc->owner);
1384 lttng_kprobes_destroy_event_private(event);
1385 break;
1386 case LTTNG_KERNEL_KRETPROBE:
1387 module_put(event->desc->owner);
1388 lttng_kretprobes_destroy_private(event);
1389 break;
1390 case LTTNG_KERNEL_NOOP:
1391 case LTTNG_KERNEL_SYSCALL:
1392 break;
1393 case LTTNG_KERNEL_UPROBE:
1394 module_put(event->desc->owner);
1395 lttng_uprobes_destroy_event_private(event);
1396 break;
1397 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
1398 default:
1399 WARN_ON_ONCE(1);
1400 }
1401 list_del(&event->list);
1402 lttng_destroy_context(event->ctx);
1403 kmem_cache_free(event_cache, event);
1404 }
1405
1406 /*
1407 * Only used internally at session destruction.
1408 */
1409 static
1410 void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier)
1411 {
1412 switch (event_notifier->instrumentation) {
1413 case LTTNG_KERNEL_TRACEPOINT:
1414 lttng_event_desc_put(event_notifier->desc);
1415 break;
1416 case LTTNG_KERNEL_KPROBE:
1417 module_put(event_notifier->desc->owner);
1418 lttng_kprobes_destroy_event_notifier_private(event_notifier);
1419 break;
1420 case LTTNG_KERNEL_NOOP:
1421 case LTTNG_KERNEL_SYSCALL:
1422 break;
1423 case LTTNG_KERNEL_UPROBE:
1424 module_put(event_notifier->desc->owner);
1425 lttng_uprobes_destroy_event_notifier_private(event_notifier);
1426 break;
1427 case LTTNG_KERNEL_KRETPROBE:
1428 case LTTNG_KERNEL_FUNCTION:
1429 default:
1430 WARN_ON_ONCE(1);
1431 }
1432 list_del(&event_notifier->list);
1433 kmem_cache_free(event_notifier_cache, event_notifier);
1434 }
1435
1436 struct lttng_id_tracker *get_tracker(struct lttng_session *session,
1437 enum tracker_type tracker_type)
1438 {
1439 switch (tracker_type) {
1440 case TRACKER_PID:
1441 return &session->pid_tracker;
1442 case TRACKER_VPID:
1443 return &session->vpid_tracker;
1444 case TRACKER_UID:
1445 return &session->uid_tracker;
1446 case TRACKER_VUID:
1447 return &session->vuid_tracker;
1448 case TRACKER_GID:
1449 return &session->gid_tracker;
1450 case TRACKER_VGID:
1451 return &session->vgid_tracker;
1452 default:
1453 WARN_ON_ONCE(1);
1454 return NULL;
1455 }
1456 }
1457
1458 int lttng_session_track_id(struct lttng_session *session,
1459 enum tracker_type tracker_type, int id)
1460 {
1461 struct lttng_id_tracker *tracker;
1462 int ret;
1463
1464 tracker = get_tracker(session, tracker_type);
1465 if (!tracker)
1466 return -EINVAL;
1467 if (id < -1)
1468 return -EINVAL;
1469 mutex_lock(&sessions_mutex);
1470 if (id == -1) {
1471 /* track all ids: destroy tracker. */
1472 lttng_id_tracker_destroy(tracker, true);
1473 ret = 0;
1474 } else {
1475 ret = lttng_id_tracker_add(tracker, id);
1476 }
1477 mutex_unlock(&sessions_mutex);
1478 return ret;
1479 }
1480
1481 int lttng_session_untrack_id(struct lttng_session *session,
1482 enum tracker_type tracker_type, int id)
1483 {
1484 struct lttng_id_tracker *tracker;
1485 int ret;
1486
1487 tracker = get_tracker(session, tracker_type);
1488 if (!tracker)
1489 return -EINVAL;
1490 if (id < -1)
1491 return -EINVAL;
1492 mutex_lock(&sessions_mutex);
1493 if (id == -1) {
1494 /* untrack all ids: replace by empty tracker. */
1495 ret = lttng_id_tracker_empty_set(tracker);
1496 } else {
1497 ret = lttng_id_tracker_del(tracker, id);
1498 }
1499 mutex_unlock(&sessions_mutex);
1500 return ret;
1501 }
1502
1503 static
1504 void *id_list_start(struct seq_file *m, loff_t *pos)
1505 {
1506 struct lttng_id_tracker *id_tracker = m->private;
1507 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1508 struct lttng_id_hash_node *e;
1509 int iter = 0, i;
1510
1511 mutex_lock(&sessions_mutex);
1512 if (id_tracker_p) {
1513 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1514 struct hlist_head *head = &id_tracker_p->id_hash[i];
1515
1516 lttng_hlist_for_each_entry(e, head, hlist) {
1517 if (iter++ >= *pos)
1518 return e;
1519 }
1520 }
1521 } else {
1522 /* ID tracker disabled. */
1523 if (iter >= *pos && iter == 0) {
1524 return id_tracker_p; /* empty tracker */
1525 }
1526 iter++;
1527 }
1528 /* End of list */
1529 return NULL;
1530 }
1531
1532 /* Called with sessions_mutex held. */
1533 static
1534 void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
1535 {
1536 struct lttng_id_tracker *id_tracker = m->private;
1537 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1538 struct lttng_id_hash_node *e;
1539 int iter = 0, i;
1540
1541 (*ppos)++;
1542 if (id_tracker_p) {
1543 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1544 struct hlist_head *head = &id_tracker_p->id_hash[i];
1545
1546 lttng_hlist_for_each_entry(e, head, hlist) {
1547 if (iter++ >= *ppos)
1548 return e;
1549 }
1550 }
1551 } else {
1552 /* ID tracker disabled. */
1553 if (iter >= *ppos && iter == 0)
1554 return p; /* empty tracker */
1555 iter++;
1556 }
1557
1558 /* End of list */
1559 return NULL;
1560 }
1561
1562 static
1563 void id_list_stop(struct seq_file *m, void *p)
1564 {
1565 mutex_unlock(&sessions_mutex);
1566 }
1567
1568 static
1569 int id_list_show(struct seq_file *m, void *p)
1570 {
1571 struct lttng_id_tracker *id_tracker = m->private;
1572 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1573 int id;
1574
1575 if (p == id_tracker_p) {
1576 /* Tracker disabled. */
1577 id = -1;
1578 } else {
1579 const struct lttng_id_hash_node *e = p;
1580
1581 id = lttng_id_tracker_get_node_id(e);
1582 }
1583 switch (id_tracker->tracker_type) {
1584 case TRACKER_PID:
1585 seq_printf(m, "process { pid = %d; };\n", id);
1586 break;
1587 case TRACKER_VPID:
1588 seq_printf(m, "process { vpid = %d; };\n", id);
1589 break;
1590 case TRACKER_UID:
1591 seq_printf(m, "user { uid = %d; };\n", id);
1592 break;
1593 case TRACKER_VUID:
1594 seq_printf(m, "user { vuid = %d; };\n", id);
1595 break;
1596 case TRACKER_GID:
1597 seq_printf(m, "group { gid = %d; };\n", id);
1598 break;
1599 case TRACKER_VGID:
1600 seq_printf(m, "group { vgid = %d; };\n", id);
1601 break;
1602 default:
1603 seq_printf(m, "UNKNOWN { field = %d };\n", id);
1604 }
1605 return 0;
1606 }
1607
1608 static
1609 const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1610 .start = id_list_start,
1611 .next = id_list_next,
1612 .stop = id_list_stop,
1613 .show = id_list_show,
1614 };
1615
1616 static
1617 int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
1618 {
1619 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
1620 }
1621
1622 static
1623 int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
1624 {
1625 struct seq_file *m = file->private_data;
1626 struct lttng_id_tracker *id_tracker = m->private;
1627 int ret;
1628
1629 WARN_ON_ONCE(!id_tracker);
1630 ret = seq_release(inode, file);
1631 if (!ret)
1632 fput(id_tracker->session->file);
1633 return ret;
1634 }
1635
1636 const struct file_operations lttng_tracker_ids_list_fops = {
1637 .owner = THIS_MODULE,
1638 .open = lttng_tracker_ids_list_open,
1639 .read = seq_read,
1640 .llseek = seq_lseek,
1641 .release = lttng_tracker_ids_list_release,
1642 };
1643
1644 int lttng_session_list_tracker_ids(struct lttng_session *session,
1645 enum tracker_type tracker_type)
1646 {
1647 struct file *tracker_ids_list_file;
1648 struct seq_file *m;
1649 int file_fd, ret;
1650
1651 file_fd = lttng_get_unused_fd();
1652 if (file_fd < 0) {
1653 ret = file_fd;
1654 goto fd_error;
1655 }
1656
1657 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1658 &lttng_tracker_ids_list_fops,
1659 NULL, O_RDWR);
1660 if (IS_ERR(tracker_ids_list_file)) {
1661 ret = PTR_ERR(tracker_ids_list_file);
1662 goto file_error;
1663 }
1664 if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) {
1665 ret = -EOVERFLOW;
1666 goto refcount_error;
1667 }
1668 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
1669 if (ret < 0)
1670 goto open_error;
1671 m = tracker_ids_list_file->private_data;
1672
1673 m->private = get_tracker(session, tracker_type);
1674 BUG_ON(!m->private);
1675 fd_install(file_fd, tracker_ids_list_file);
1676
1677 return file_fd;
1678
1679 open_error:
1680 atomic_long_dec(&session->file->f_count);
1681 refcount_error:
1682 fput(tracker_ids_list_file);
1683 file_error:
1684 put_unused_fd(file_fd);
1685 fd_error:
1686 return ret;
1687 }
1688
1689 /*
1690 * Enabler management.
1691 */
1692 static
1693 int lttng_match_enabler_star_glob(const char *desc_name,
1694 const char *pattern)
1695 {
1696 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1697 desc_name, LTTNG_SIZE_MAX))
1698 return 0;
1699 return 1;
1700 }
1701
1702 static
1703 int lttng_match_enabler_name(const char *desc_name,
1704 const char *name)
1705 {
1706 if (strcmp(desc_name, name))
1707 return 0;
1708 return 1;
1709 }
1710
1711 int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
1712 struct lttng_enabler *enabler)
1713 {
1714 const char *desc_name, *enabler_name;
1715 bool compat = false, entry = false;
1716
1717 enabler_name = enabler->event_param.name;
1718 switch (enabler->event_param.instrumentation) {
1719 case LTTNG_KERNEL_TRACEPOINT:
1720 desc_name = desc->name;
1721 switch (enabler->format_type) {
1722 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
1723 return lttng_match_enabler_star_glob(desc_name, enabler_name);
1724 case LTTNG_ENABLER_FORMAT_NAME:
1725 return lttng_match_enabler_name(desc_name, enabler_name);
1726 default:
1727 return -EINVAL;
1728 }
1729 break;
1730 case LTTNG_KERNEL_SYSCALL:
1731 desc_name = desc->name;
1732 if (!strncmp(desc_name, "compat_", strlen("compat_"))) {
1733 desc_name += strlen("compat_");
1734 compat = true;
1735 }
1736 if (!strncmp(desc_name, "syscall_exit_",
1737 strlen("syscall_exit_"))) {
1738 desc_name += strlen("syscall_exit_");
1739 } else if (!strncmp(desc_name, "syscall_entry_",
1740 strlen("syscall_entry_"))) {
1741 desc_name += strlen("syscall_entry_");
1742 entry = true;
1743 } else {
1744 WARN_ON_ONCE(1);
1745 return -EINVAL;
1746 }
1747 switch (enabler->event_param.u.syscall.entryexit) {
1748 case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
1749 break;
1750 case LTTNG_KERNEL_SYSCALL_ENTRY:
1751 if (!entry)
1752 return 0;
1753 break;
1754 case LTTNG_KERNEL_SYSCALL_EXIT:
1755 if (entry)
1756 return 0;
1757 break;
1758 default:
1759 return -EINVAL;
1760 }
1761 switch (enabler->event_param.u.syscall.abi) {
1762 case LTTNG_KERNEL_SYSCALL_ABI_ALL:
1763 break;
1764 case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
1765 if (compat)
1766 return 0;
1767 break;
1768 case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
1769 if (!compat)
1770 return 0;
1771 break;
1772 default:
1773 return -EINVAL;
1774 }
1775 switch (enabler->event_param.u.syscall.match) {
1776 case LTTNG_KERNEL_SYSCALL_MATCH_NAME:
1777 switch (enabler->format_type) {
1778 case LTTNG_ENABLER_FORMAT_STAR_GLOB:
1779 return lttng_match_enabler_star_glob(desc_name, enabler_name);
1780 case LTTNG_ENABLER_FORMAT_NAME:
1781 return lttng_match_enabler_name(desc_name, enabler_name);
1782 default:
1783 return -EINVAL;
1784 }
1785 break;
1786 case LTTNG_KERNEL_SYSCALL_MATCH_NR:
1787 return -EINVAL; /* Not implemented. */
1788 default:
1789 return -EINVAL;
1790 }
1791 break;
1792 default:
1793 WARN_ON_ONCE(1);
1794 return -EINVAL;
1795 }
1796 }
1797
1798 static
1799 int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler,
1800 struct lttng_event *event)
1801 {
1802 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(
1803 event_enabler);
1804
1805 if (base_enabler->event_param.instrumentation != event->instrumentation)
1806 return 0;
1807 if (lttng_desc_match_enabler(event->desc, base_enabler)
1808 && event->chan == event_enabler->chan)
1809 return 1;
1810 else
1811 return 0;
1812 }
1813
1814 static
1815 int lttng_event_notifier_enabler_match_event_notifier(struct lttng_event_notifier_enabler *event_notifier_enabler,
1816 struct lttng_event_notifier *event_notifier)
1817 {
1818 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(
1819 event_notifier_enabler);
1820
1821 if (base_enabler->event_param.instrumentation != event_notifier->instrumentation)
1822 return 0;
1823 if (lttng_desc_match_enabler(event_notifier->desc, base_enabler)
1824 && event_notifier->group == event_notifier_enabler->group
1825 && event_notifier->user_token == event_notifier_enabler->base.user_token)
1826 return 1;
1827 else
1828 return 0;
1829 }
1830
1831 static
1832 struct lttng_enabler_ref *lttng_enabler_ref(
1833 struct list_head *enablers_ref_list,
1834 struct lttng_enabler *enabler)
1835 {
1836 struct lttng_enabler_ref *enabler_ref;
1837
1838 list_for_each_entry(enabler_ref, enablers_ref_list, node) {
1839 if (enabler_ref->ref == enabler)
1840 return enabler_ref;
1841 }
1842 return NULL;
1843 }
1844
1845 static
1846 void lttng_create_tracepoint_event_if_missing(struct lttng_event_enabler *event_enabler)
1847 {
1848 struct lttng_session *session = event_enabler->chan->session;
1849 struct lttng_probe_desc *probe_desc;
1850 const struct lttng_event_desc *desc;
1851 int i;
1852 struct list_head *probe_list;
1853
1854 probe_list = lttng_get_probe_list_head();
1855 /*
1856 * For each probe event, if we find that a probe event matches
1857 * our enabler, create an associated lttng_event if not
1858 * already present.
1859 */
1860 list_for_each_entry(probe_desc, probe_list, head) {
1861 for (i = 0; i < probe_desc->nr_events; i++) {
1862 int found = 0;
1863 struct hlist_head *head;
1864 struct lttng_event *event;
1865
1866 desc = probe_desc->event_desc[i];
1867 if (!lttng_desc_match_enabler(desc,
1868 lttng_event_enabler_as_enabler(event_enabler)))
1869 continue;
1870
1871 /*
1872 * Check if already created.
1873 */
1874 head = utils_borrow_hash_table_bucket(
1875 session->events_ht.table, LTTNG_EVENT_HT_SIZE,
1876 desc->name);
1877 lttng_hlist_for_each_entry(event, head, hlist) {
1878 if (event->desc == desc
1879 && event->chan == event_enabler->chan)
1880 found = 1;
1881 }
1882 if (found)
1883 continue;
1884
1885 /*
1886 * We need to create an event for this
1887 * event probe.
1888 */
1889 event = _lttng_event_create(event_enabler->chan,
1890 NULL, NULL, desc,
1891 LTTNG_KERNEL_TRACEPOINT);
1892 if (!event) {
1893 printk(KERN_INFO "LTTng: Unable to create event %s\n",
1894 probe_desc->event_desc[i]->name);
1895 }
1896 }
1897 }
1898 }
1899
1900 static
1901 void lttng_create_tracepoint_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
1902 {
1903 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
1904 struct lttng_probe_desc *probe_desc;
1905 const struct lttng_event_desc *desc;
1906 int i;
1907 struct list_head *probe_list;
1908
1909 probe_list = lttng_get_probe_list_head();
1910 /*
1911 * For each probe event, if we find that a probe event matches
1912 * our enabler, create an associated lttng_event_notifier if not
1913 * already present.
1914 */
1915 list_for_each_entry(probe_desc, probe_list, head) {
1916 for (i = 0; i < probe_desc->nr_events; i++) {
1917 int found = 0;
1918 struct hlist_head *head;
1919 struct lttng_event_notifier *event_notifier;
1920
1921 desc = probe_desc->event_desc[i];
1922 if (!lttng_desc_match_enabler(desc,
1923 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
1924 continue;
1925
1926 /*
1927 * Check if already created.
1928 */
1929 head = utils_borrow_hash_table_bucket(
1930 event_notifier_group->event_notifiers_ht.table,
1931 LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name);
1932 lttng_hlist_for_each_entry(event_notifier, head, hlist) {
1933 if (event_notifier->desc == desc
1934 && event_notifier->user_token == event_notifier_enabler->base.user_token)
1935 found = 1;
1936 }
1937 if (found)
1938 continue;
1939
1940 /*
1941 * We need to create a event_notifier for this event probe.
1942 */
1943 event_notifier = _lttng_event_notifier_create(desc,
1944 event_notifier_enabler->base.user_token,
1945 event_notifier_group, NULL, NULL,
1946 LTTNG_KERNEL_TRACEPOINT);
1947 if (IS_ERR(event_notifier)) {
1948 printk(KERN_INFO "Unable to create event_notifier %s\n",
1949 probe_desc->event_desc[i]->name);
1950 }
1951 }
1952 }
1953 }
1954
1955 static
1956 void lttng_create_syscall_event_if_missing(struct lttng_event_enabler *event_enabler)
1957 {
1958 int ret;
1959
1960 ret = lttng_syscalls_register_event(event_enabler->chan, NULL);
1961 WARN_ON_ONCE(ret);
1962 }
1963
1964 static
1965 void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
1966 {
1967 int ret;
1968
1969 ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL);
1970 WARN_ON_ONCE(ret);
1971 ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL);
1972 WARN_ON_ONCE(ret);
1973 }
1974
1975 /*
1976 * Create struct lttng_event if it is missing and present in the list of
1977 * tracepoint probes.
1978 * Should be called with sessions mutex held.
1979 */
1980 static
1981 void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler)
1982 {
1983 switch (event_enabler->base.event_param.instrumentation) {
1984 case LTTNG_KERNEL_TRACEPOINT:
1985 lttng_create_tracepoint_event_if_missing(event_enabler);
1986 break;
1987 case LTTNG_KERNEL_SYSCALL:
1988 lttng_create_syscall_event_if_missing(event_enabler);
1989 break;
1990 default:
1991 WARN_ON_ONCE(1);
1992 break;
1993 }
1994 }
1995
1996 /*
1997 * Create events associated with an event_enabler (if not already present),
1998 * and add backward reference from the event to the enabler.
1999 * Should be called with sessions mutex held.
2000 */
2001 static
2002 int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler)
2003 {
2004 struct lttng_channel *chan = event_enabler->chan;
2005 struct lttng_session *session = event_enabler->chan->session;
2006 struct lttng_enabler *base_enabler = lttng_event_enabler_as_enabler(event_enabler);
2007 struct lttng_event *event;
2008
2009 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL &&
2010 base_enabler->event_param.u.syscall.entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT &&
2011 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL &&
2012 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME &&
2013 !strcmp(base_enabler->event_param.name, "*")) {
2014 if (base_enabler->enabled)
2015 WRITE_ONCE(chan->syscall_all, 1);
2016 else
2017 WRITE_ONCE(chan->syscall_all, 0);
2018 }
2019
2020 /* First ensure that probe events are created for this enabler. */
2021 lttng_create_event_if_missing(event_enabler);
2022
2023 /* For each event matching event_enabler in session event list. */
2024 list_for_each_entry(event, &session->events, list) {
2025 struct lttng_enabler_ref *enabler_ref;
2026
2027 if (!lttng_event_enabler_match_event(event_enabler, event))
2028 continue;
2029 enabler_ref = lttng_enabler_ref(&event->enablers_ref_head,
2030 lttng_event_enabler_as_enabler(event_enabler));
2031 if (!enabler_ref) {
2032 /*
2033 * If no backward ref, create it.
2034 * Add backward ref from event to event_enabler.
2035 */
2036 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2037 if (!enabler_ref)
2038 return -ENOMEM;
2039 enabler_ref->ref = lttng_event_enabler_as_enabler(event_enabler);
2040 list_add(&enabler_ref->node,
2041 &event->enablers_ref_head);
2042 }
2043
2044 /*
2045 * Link filter bytecodes if not linked yet.
2046 */
2047 lttng_enabler_link_bytecode(event->desc,
2048 lttng_static_ctx,
2049 &event->filter_bytecode_runtime_head,
2050 &lttng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head);
2051
2052 /* TODO: merge event context. */
2053 }
2054 return 0;
2055 }
2056
2057 /*
2058 * Create struct lttng_event_notifier if it is missing and present in the list of
2059 * tracepoint probes.
2060 * Should be called with sessions mutex held.
2061 */
2062 static
2063 void lttng_create_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
2064 {
2065 switch (event_notifier_enabler->base.event_param.instrumentation) {
2066 case LTTNG_KERNEL_TRACEPOINT:
2067 lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
2068 break;
2069 case LTTNG_KERNEL_SYSCALL:
2070 lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler);
2071 break;
2072 default:
2073 WARN_ON_ONCE(1);
2074 break;
2075 }
2076 }
2077
2078 /*
2079 * Create event_notifiers associated with a event_notifier enabler (if not already present).
2080 */
2081 static
2082 int lttng_event_notifier_enabler_ref_event_notifiers(
2083 struct lttng_event_notifier_enabler *event_notifier_enabler)
2084 {
2085 struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
2086 struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2087 struct lttng_event_notifier *event_notifier;
2088
2089 if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL &&
2090 base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL &&
2091 base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME &&
2092 !strcmp(base_enabler->event_param.name, "*")) {
2093
2094 int enabled = base_enabler->enabled;
2095 enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
2096
2097 if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT)
2098 WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled);
2099
2100 if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT)
2101 WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled);
2102
2103 }
2104
2105 /* First ensure that probe event_notifiers are created for this enabler. */
2106 lttng_create_event_notifier_if_missing(event_notifier_enabler);
2107
2108 /* Link the created event_notifier with its associated enabler. */
2109 list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) {
2110 struct lttng_enabler_ref *enabler_ref;
2111
2112 if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier))
2113 continue;
2114
2115 enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head,
2116 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2117 if (!enabler_ref) {
2118 /*
2119 * If no backward ref, create it.
2120 * Add backward ref from event_notifier to enabler.
2121 */
2122 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
2123 if (!enabler_ref)
2124 return -ENOMEM;
2125
2126 enabler_ref->ref = lttng_event_notifier_enabler_as_enabler(
2127 event_notifier_enabler);
2128 list_add(&enabler_ref->node,
2129 &event_notifier->enablers_ref_head);
2130 }
2131
2132 /*
2133 * Link filter bytecodes if not linked yet.
2134 */
2135 lttng_enabler_link_bytecode(event_notifier->desc,
2136 lttng_static_ctx, &event_notifier->filter_bytecode_runtime_head,
2137 &lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head);
2138
2139 /* Link capture bytecodes if not linked yet. */
2140 lttng_enabler_link_bytecode(event_notifier->desc,
2141 lttng_static_ctx, &event_notifier->capture_bytecode_runtime_head,
2142 &event_notifier_enabler->capture_bytecode_head);
2143
2144 event_notifier->num_captures = event_notifier_enabler->num_captures;
2145 }
2146 return 0;
2147 }
2148
2149 /*
2150 * Called at module load: connect the probe on all enablers matching
2151 * this event.
2152 * Called with sessions lock held.
2153 */
2154 int lttng_fix_pending_events(void)
2155 {
2156 struct lttng_session *session;
2157
2158 list_for_each_entry(session, &sessions, list)
2159 lttng_session_lazy_sync_event_enablers(session);
2160 return 0;
2161 }
2162
2163 static bool lttng_event_notifier_group_has_active_event_notifiers(
2164 struct lttng_event_notifier_group *event_notifier_group)
2165 {
2166 struct lttng_event_notifier_enabler *event_notifier_enabler;
2167
2168 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head,
2169 node) {
2170 if (event_notifier_enabler->base.enabled)
2171 return true;
2172 }
2173 return false;
2174 }
2175
2176 bool lttng_event_notifier_active(void)
2177 {
2178 struct lttng_event_notifier_group *event_notifier_group;
2179
2180 list_for_each_entry(event_notifier_group, &event_notifier_groups, node) {
2181 if (lttng_event_notifier_group_has_active_event_notifiers(event_notifier_group))
2182 return true;
2183 }
2184 return false;
2185 }
2186
2187 int lttng_fix_pending_event_notifiers(void)
2188 {
2189 struct lttng_event_notifier_group *event_notifier_group;
2190
2191 list_for_each_entry(event_notifier_group, &event_notifier_groups, node)
2192 lttng_event_notifier_group_sync_enablers(event_notifier_group);
2193 return 0;
2194 }
2195
2196 struct lttng_event_enabler *lttng_event_enabler_create(
2197 enum lttng_enabler_format_type format_type,
2198 struct lttng_kernel_event *event_param,
2199 struct lttng_channel *chan)
2200 {
2201 struct lttng_event_enabler *event_enabler;
2202
2203 event_enabler = kzalloc(sizeof(*event_enabler), GFP_KERNEL);
2204 if (!event_enabler)
2205 return NULL;
2206 event_enabler->base.format_type = format_type;
2207 INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head);
2208 memcpy(&event_enabler->base.event_param, event_param,
2209 sizeof(event_enabler->base.event_param));
2210 event_enabler->chan = chan;
2211 /* ctx left NULL */
2212 event_enabler->base.enabled = 0;
2213 event_enabler->base.evtype = LTTNG_TYPE_ENABLER;
2214 mutex_lock(&sessions_mutex);
2215 list_add(&event_enabler->node, &event_enabler->chan->session->enablers_head);
2216 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
2217 mutex_unlock(&sessions_mutex);
2218 return event_enabler;
2219 }
2220
2221 int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler)
2222 {
2223 mutex_lock(&sessions_mutex);
2224 lttng_event_enabler_as_enabler(event_enabler)->enabled = 1;
2225 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
2226 mutex_unlock(&sessions_mutex);
2227 return 0;
2228 }
2229
2230 int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler)
2231 {
2232 mutex_lock(&sessions_mutex);
2233 lttng_event_enabler_as_enabler(event_enabler)->enabled = 0;
2234 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
2235 mutex_unlock(&sessions_mutex);
2236 return 0;
2237 }
2238
2239 static
2240 int lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler,
2241 struct lttng_kernel_filter_bytecode __user *bytecode)
2242 {
2243 struct lttng_bytecode_node *bytecode_node;
2244 uint32_t bytecode_len;
2245 int ret;
2246
2247 ret = get_user(bytecode_len, &bytecode->len);
2248 if (ret)
2249 return ret;
2250 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2251 GFP_KERNEL);
2252 if (!bytecode_node)
2253 return -ENOMEM;
2254 ret = copy_from_user(&bytecode_node->bc, bytecode,
2255 sizeof(*bytecode) + bytecode_len);
2256 if (ret)
2257 goto error_free;
2258
2259 bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_FILTER;
2260 bytecode_node->enabler = enabler;
2261 /* Enforce length based on allocated size */
2262 bytecode_node->bc.len = bytecode_len;
2263 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
2264
2265 return 0;
2266
2267 error_free:
2268 lttng_kvfree(bytecode_node);
2269 return ret;
2270 }
2271
2272 int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler,
2273 struct lttng_kernel_filter_bytecode __user *bytecode)
2274 {
2275 int ret;
2276 ret = lttng_enabler_attach_filter_bytecode(
2277 lttng_event_enabler_as_enabler(event_enabler), bytecode);
2278 if (ret)
2279 goto error;
2280
2281 lttng_session_lazy_sync_event_enablers(event_enabler->chan->session);
2282 return 0;
2283
2284 error:
2285 return ret;
2286 }
2287
2288 int lttng_event_add_callsite(struct lttng_event *event,
2289 struct lttng_kernel_event_callsite __user *callsite)
2290 {
2291
2292 switch (event->instrumentation) {
2293 case LTTNG_KERNEL_UPROBE:
2294 return lttng_uprobes_event_add_callsite(event, callsite);
2295 default:
2296 return -EINVAL;
2297 }
2298 }
2299
2300 int lttng_event_enabler_attach_context(struct lttng_event_enabler *event_enabler,
2301 struct lttng_kernel_context *context_param)
2302 {
2303 return -ENOSYS;
2304 }
2305
2306 static
2307 void lttng_enabler_destroy(struct lttng_enabler *enabler)
2308 {
2309 struct lttng_bytecode_node *filter_node, *tmp_filter_node;
2310
2311 /* Destroy filter bytecode */
2312 list_for_each_entry_safe(filter_node, tmp_filter_node,
2313 &enabler->filter_bytecode_head, node) {
2314 lttng_kvfree(filter_node);
2315 }
2316 }
2317
2318 static
2319 void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler)
2320 {
2321 lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler));
2322
2323 /* Destroy contexts */
2324 lttng_destroy_context(event_enabler->ctx);
2325
2326 list_del(&event_enabler->node);
2327 kfree(event_enabler);
2328 }
2329
2330 struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create(
2331 struct lttng_event_notifier_group *event_notifier_group,
2332 enum lttng_enabler_format_type format_type,
2333 struct lttng_kernel_event_notifier *event_notifier_param)
2334 {
2335 struct lttng_event_notifier_enabler *event_notifier_enabler;
2336
2337 event_notifier_enabler = kzalloc(sizeof(*event_notifier_enabler), GFP_KERNEL);
2338 if (!event_notifier_enabler)
2339 return NULL;
2340
2341 event_notifier_enabler->base.format_type = format_type;
2342 INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
2343 INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head);
2344
2345 event_notifier_enabler->num_captures = 0;
2346
2347 memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event,
2348 sizeof(event_notifier_enabler->base.event_param));
2349 event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER;
2350
2351 event_notifier_enabler->base.enabled = 0;
2352 event_notifier_enabler->base.user_token = event_notifier_param->event.token;
2353 event_notifier_enabler->group = event_notifier_group;
2354
2355 mutex_lock(&sessions_mutex);
2356 list_add(&event_notifier_enabler->node, &event_notifier_enabler->group->enablers_head);
2357 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2358
2359 mutex_unlock(&sessions_mutex);
2360
2361 return event_notifier_enabler;
2362 }
2363
2364 int lttng_event_notifier_enabler_enable(
2365 struct lttng_event_notifier_enabler *event_notifier_enabler)
2366 {
2367 mutex_lock(&sessions_mutex);
2368 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1;
2369 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2370 mutex_unlock(&sessions_mutex);
2371 return 0;
2372 }
2373
2374 int lttng_event_notifier_enabler_disable(
2375 struct lttng_event_notifier_enabler *event_notifier_enabler)
2376 {
2377 mutex_lock(&sessions_mutex);
2378 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0;
2379 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2380 mutex_unlock(&sessions_mutex);
2381 return 0;
2382 }
2383
2384 int lttng_event_notifier_enabler_attach_filter_bytecode(
2385 struct lttng_event_notifier_enabler *event_notifier_enabler,
2386 struct lttng_kernel_filter_bytecode __user *bytecode)
2387 {
2388 int ret;
2389
2390 ret = lttng_enabler_attach_filter_bytecode(
2391 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler),
2392 bytecode);
2393 if (ret)
2394 goto error;
2395
2396 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2397 return 0;
2398
2399 error:
2400 return ret;
2401 }
2402
2403 int lttng_event_notifier_enabler_attach_capture_bytecode(
2404 struct lttng_event_notifier_enabler *event_notifier_enabler,
2405 struct lttng_kernel_capture_bytecode __user *bytecode)
2406 {
2407 struct lttng_bytecode_node *bytecode_node;
2408 struct lttng_enabler *enabler =
2409 lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
2410 uint32_t bytecode_len;
2411 int ret;
2412
2413 ret = get_user(bytecode_len, &bytecode->len);
2414 if (ret)
2415 return ret;
2416
2417 bytecode_node = lttng_kvzalloc(sizeof(*bytecode_node) + bytecode_len,
2418 GFP_KERNEL);
2419 if (!bytecode_node)
2420 return -ENOMEM;
2421
2422 ret = copy_from_user(&bytecode_node->bc, bytecode,
2423 sizeof(*bytecode) + bytecode_len);
2424 if (ret)
2425 goto error_free;
2426
2427 bytecode_node->type = LTTNG_BYTECODE_NODE_TYPE_CAPTURE;
2428 bytecode_node->enabler = enabler;
2429
2430 /* Enforce length based on allocated size */
2431 bytecode_node->bc.len = bytecode_len;
2432 list_add_tail(&bytecode_node->node, &event_notifier_enabler->capture_bytecode_head);
2433
2434 event_notifier_enabler->num_captures++;
2435
2436 lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group);
2437 goto end;
2438
2439 error_free:
2440 lttng_kvfree(bytecode_node);
2441 end:
2442 return ret;
2443 }
2444
2445 int lttng_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
2446 struct lttng_kernel_event_callsite __user *callsite)
2447 {
2448
2449 switch (event_notifier->instrumentation) {
2450 case LTTNG_KERNEL_UPROBE:
2451 return lttng_uprobes_event_notifier_add_callsite(event_notifier,
2452 callsite);
2453 default:
2454 return -EINVAL;
2455 }
2456 }
2457
2458 int lttng_event_notifier_enabler_attach_context(
2459 struct lttng_event_notifier_enabler *event_notifier_enabler,
2460 struct lttng_kernel_context *context_param)
2461 {
2462 return -ENOSYS;
2463 }
2464
2465 static
2466 void lttng_event_notifier_enabler_destroy(
2467 struct lttng_event_notifier_enabler *event_notifier_enabler)
2468 {
2469 if (!event_notifier_enabler) {
2470 return;
2471 }
2472
2473 list_del(&event_notifier_enabler->node);
2474
2475 lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler));
2476 kfree(event_notifier_enabler);
2477 }
2478
2479 /*
2480 * lttng_session_sync_event_enablers should be called just before starting a
2481 * session.
2482 * Should be called with sessions mutex held.
2483 */
2484 static
2485 void lttng_session_sync_event_enablers(struct lttng_session *session)
2486 {
2487 struct lttng_event_enabler *event_enabler;
2488 struct lttng_event *event;
2489
2490 list_for_each_entry(event_enabler, &session->enablers_head, node)
2491 lttng_event_enabler_ref_events(event_enabler);
2492 /*
2493 * For each event, if at least one of its enablers is enabled,
2494 * and its channel and session transient states are enabled, we
2495 * enable the event, else we disable it.
2496 */
2497 list_for_each_entry(event, &session->events, list) {
2498 struct lttng_enabler_ref *enabler_ref;
2499 struct lttng_bytecode_runtime *runtime;
2500 int enabled = 0, has_enablers_without_bytecode = 0;
2501
2502 switch (event->instrumentation) {
2503 case LTTNG_KERNEL_TRACEPOINT:
2504 case LTTNG_KERNEL_SYSCALL:
2505 /* Enable events */
2506 list_for_each_entry(enabler_ref,
2507 &event->enablers_ref_head, node) {
2508 if (enabler_ref->ref->enabled) {
2509 enabled = 1;
2510 break;
2511 }
2512 }
2513 break;
2514 default:
2515 /* Not handled with lazy sync. */
2516 continue;
2517 }
2518 /*
2519 * Enabled state is based on union of enablers, with
2520 * intesection of session and channel transient enable
2521 * states.
2522 */
2523 enabled = enabled && session->tstate && event->chan->tstate;
2524
2525 WRITE_ONCE(event->enabled, enabled);
2526 /*
2527 * Sync tracepoint registration with event enabled
2528 * state.
2529 */
2530 if (enabled) {
2531 register_event(event);
2532 } else {
2533 _lttng_event_unregister(event);
2534 }
2535
2536 /* Check if has enablers without bytecode enabled */
2537 list_for_each_entry(enabler_ref,
2538 &event->enablers_ref_head, node) {
2539 if (enabler_ref->ref->enabled
2540 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2541 has_enablers_without_bytecode = 1;
2542 break;
2543 }
2544 }
2545 event->has_enablers_without_bytecode =
2546 has_enablers_without_bytecode;
2547
2548 /* Enable filters */
2549 list_for_each_entry(runtime,
2550 &event->filter_bytecode_runtime_head, node)
2551 lttng_bytecode_filter_sync_state(runtime);
2552 }
2553 }
2554
2555 /*
2556 * Apply enablers to session events, adding events to session if need
2557 * be. It is required after each modification applied to an active
2558 * session, and right before session "start".
2559 * "lazy" sync means we only sync if required.
2560 * Should be called with sessions mutex held.
2561 */
2562 static
2563 void lttng_session_lazy_sync_event_enablers(struct lttng_session *session)
2564 {
2565 /* We can skip if session is not active */
2566 if (!session->active)
2567 return;
2568 lttng_session_sync_event_enablers(session);
2569 }
2570
2571 static
2572 void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group)
2573 {
2574 struct lttng_event_notifier_enabler *event_notifier_enabler;
2575 struct lttng_event_notifier *event_notifier;
2576
2577 list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node)
2578 lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler);
2579
2580 /*
2581 * For each event_notifier, if at least one of its enablers is enabled,
2582 * we enable the event_notifier, else we disable it.
2583 */
2584 list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, list) {
2585 struct lttng_enabler_ref *enabler_ref;
2586 struct lttng_bytecode_runtime *runtime;
2587 int enabled = 0, has_enablers_without_bytecode = 0;
2588
2589 switch (event_notifier->instrumentation) {
2590 case LTTNG_KERNEL_TRACEPOINT:
2591 case LTTNG_KERNEL_SYSCALL:
2592 /* Enable event_notifiers */
2593 list_for_each_entry(enabler_ref,
2594 &event_notifier->enablers_ref_head, node) {
2595 if (enabler_ref->ref->enabled) {
2596 enabled = 1;
2597 break;
2598 }
2599 }
2600 break;
2601 default:
2602 /* Not handled with sync. */
2603 continue;
2604 }
2605
2606 WRITE_ONCE(event_notifier->enabled, enabled);
2607 /*
2608 * Sync tracepoint registration with event_notifier enabled
2609 * state.
2610 */
2611 if (enabled) {
2612 if (!event_notifier->registered)
2613 register_event_notifier(event_notifier);
2614 } else {
2615 if (event_notifier->registered)
2616 _lttng_event_notifier_unregister(event_notifier);
2617 }
2618
2619 /* Check if has enablers without bytecode enabled */
2620 list_for_each_entry(enabler_ref,
2621 &event_notifier->enablers_ref_head, node) {
2622 if (enabler_ref->ref->enabled
2623 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
2624 has_enablers_without_bytecode = 1;
2625 break;
2626 }
2627 }
2628 event_notifier->has_enablers_without_bytecode =
2629 has_enablers_without_bytecode;
2630
2631 /* Enable filters */
2632 list_for_each_entry(runtime,
2633 &event_notifier->filter_bytecode_runtime_head, node)
2634 lttng_bytecode_filter_sync_state(runtime);
2635
2636 /* Enable captures */
2637 list_for_each_entry(runtime,
2638 &event_notifier->capture_bytecode_runtime_head, node)
2639 lttng_bytecode_capture_sync_state(runtime);
2640 }
2641 }
2642
2643 /*
2644 * Serialize at most one packet worth of metadata into a metadata
2645 * channel.
2646 * We grab the metadata cache mutex to get exclusive access to our metadata
2647 * buffer and to the metadata cache. Exclusive access to the metadata buffer
2648 * allows us to do racy operations such as looking for remaining space left in
2649 * packet and write, since mutual exclusion protects us from concurrent writes.
2650 * Mutual exclusion on the metadata cache allow us to read the cache content
2651 * without racing against reallocation of the cache by updates.
2652 * Returns the number of bytes written in the channel, 0 if no data
2653 * was written and a negative value on error.
2654 */
2655 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
2656 struct channel *chan, bool *coherent)
2657 {
2658 struct lib_ring_buffer_ctx ctx;
2659 int ret = 0;
2660 size_t len, reserve_len;
2661
2662 /*
2663 * Ensure we support mutiple get_next / put sequences followed by
2664 * put_next. The metadata cache lock protects reading the metadata
2665 * cache. It can indeed be read concurrently by "get_next_subbuf" and
2666 * "flush" operations on the buffer invoked by different processes.
2667 * Moreover, since the metadata cache memory can be reallocated, we
2668 * need to have exclusive access against updates even though we only
2669 * read it.
2670 */
2671 mutex_lock(&stream->metadata_cache->lock);
2672 WARN_ON(stream->metadata_in < stream->metadata_out);
2673 if (stream->metadata_in != stream->metadata_out)
2674 goto end;
2675
2676 /* Metadata regenerated, change the version. */
2677 if (stream->metadata_cache->version != stream->version)
2678 stream->version = stream->metadata_cache->version;
2679
2680 len = stream->metadata_cache->metadata_written -
2681 stream->metadata_in;
2682 if (!len)
2683 goto end;
2684 reserve_len = min_t(size_t,
2685 stream->transport->ops.packet_avail_size(chan),
2686 len);
2687 lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len,
2688 sizeof(char), -1);
2689 /*
2690 * If reservation failed, return an error to the caller.
2691 */
2692 ret = stream->transport->ops.event_reserve(&ctx, 0);
2693 if (ret != 0) {
2694 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
2695 stream->coherent = false;
2696 goto end;
2697 }
2698 stream->transport->ops.event_write(&ctx,
2699 stream->metadata_cache->data + stream->metadata_in,
2700 reserve_len);
2701 stream->transport->ops.event_commit(&ctx);
2702 stream->metadata_in += reserve_len;
2703 if (reserve_len < len)
2704 stream->coherent = false;
2705 else
2706 stream->coherent = true;
2707 ret = reserve_len;
2708
2709 end:
2710 if (coherent)
2711 *coherent = stream->coherent;
2712 mutex_unlock(&stream->metadata_cache->lock);
2713 return ret;
2714 }
2715
2716 static
2717 void lttng_metadata_begin(struct lttng_session *session)
2718 {
2719 if (atomic_inc_return(&session->metadata_cache->producing) == 1)
2720 mutex_lock(&session->metadata_cache->lock);
2721 }
2722
2723 static
2724 void lttng_metadata_end(struct lttng_session *session)
2725 {
2726 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
2727 if (atomic_dec_return(&session->metadata_cache->producing) == 0) {
2728 struct lttng_metadata_stream *stream;
2729
2730 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list)
2731 wake_up_interruptible(&stream->read_wait);
2732 mutex_unlock(&session->metadata_cache->lock);
2733 }
2734 }
2735
2736 /*
2737 * Write the metadata to the metadata cache.
2738 * Must be called with sessions_mutex held.
2739 * The metadata cache lock protects us from concurrent read access from
2740 * thread outputting metadata content to ring buffer.
2741 * The content of the printf is printed as a single atomic metadata
2742 * transaction.
2743 */
2744 int lttng_metadata_printf(struct lttng_session *session,
2745 const char *fmt, ...)
2746 {
2747 char *str;
2748 size_t len;
2749 va_list ap;
2750
2751 WARN_ON_ONCE(!LTTNG_READ_ONCE(session->active));
2752
2753 va_start(ap, fmt);
2754 str = kvasprintf(GFP_KERNEL, fmt, ap);
2755 va_end(ap);
2756 if (!str)
2757 return -ENOMEM;
2758
2759 len = strlen(str);
2760 WARN_ON_ONCE(!atomic_read(&session->metadata_cache->producing));
2761 if (session->metadata_cache->metadata_written + len >
2762 session->metadata_cache->cache_alloc) {
2763 char *tmp_cache_realloc;
2764 unsigned int tmp_cache_alloc_size;
2765
2766 tmp_cache_alloc_size = max_t(unsigned int,
2767 session->metadata_cache->cache_alloc + len,
2768 session->metadata_cache->cache_alloc << 1);
2769 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
2770 if (!tmp_cache_realloc)
2771 goto err;
2772 if (session->metadata_cache->data) {
2773 memcpy(tmp_cache_realloc,
2774 session->metadata_cache->data,
2775 session->metadata_cache->cache_alloc);
2776 vfree(session->metadata_cache->data);
2777 }
2778
2779 session->metadata_cache->cache_alloc = tmp_cache_alloc_size;
2780 session->metadata_cache->data = tmp_cache_realloc;
2781 }
2782 memcpy(session->metadata_cache->data +
2783 session->metadata_cache->metadata_written,
2784 str, len);
2785 session->metadata_cache->metadata_written += len;
2786 kfree(str);
2787
2788 return 0;
2789
2790 err:
2791 kfree(str);
2792 return -ENOMEM;
2793 }
2794
2795 static
2796 int print_tabs(struct lttng_session *session, size_t nesting)
2797 {
2798 size_t i;
2799
2800 for (i = 0; i < nesting; i++) {
2801 int ret;
2802
2803 ret = lttng_metadata_printf(session, " ");
2804 if (ret) {
2805 return ret;
2806 }
2807 }
2808 return 0;
2809 }
2810
2811 static
2812 int lttng_field_name_statedump(struct lttng_session *session,
2813 const struct lttng_event_field *field,
2814 size_t nesting)
2815 {
2816 return lttng_metadata_printf(session, " _%s;\n", field->name);
2817 }
2818
2819 static
2820 int _lttng_integer_type_statedump(struct lttng_session *session,
2821 const struct lttng_type *type,
2822 size_t nesting)
2823 {
2824 int ret;
2825
2826 WARN_ON_ONCE(type->atype != atype_integer);
2827 ret = print_tabs(session, nesting);
2828 if (ret)
2829 return ret;
2830 ret = lttng_metadata_printf(session,
2831 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
2832 type->u.integer.size,
2833 type->u.integer.alignment,
2834 type->u.integer.signedness,
2835 (type->u.integer.encoding == lttng_encode_none)
2836 ? "none"
2837 : (type->u.integer.encoding == lttng_encode_UTF8)
2838 ? "UTF8"
2839 : "ASCII",
2840 type->u.integer.base,
2841 #if __BYTE_ORDER == __BIG_ENDIAN
2842 type->u.integer.reverse_byte_order ? " byte_order = le;" : ""
2843 #else
2844 type->u.integer.reverse_byte_order ? " byte_order = be;" : ""
2845 #endif
2846 );
2847 return ret;
2848 }
2849
2850 /*
2851 * Must be called with sessions_mutex held.
2852 */
2853 static
2854 int _lttng_struct_type_statedump(struct lttng_session *session,
2855 const struct lttng_type *type,
2856 size_t nesting)
2857 {
2858 int ret;
2859 uint32_t i, nr_fields;
2860 unsigned int alignment;
2861
2862 WARN_ON_ONCE(type->atype != atype_struct_nestable);
2863
2864 ret = print_tabs(session, nesting);
2865 if (ret)
2866 return ret;
2867 ret = lttng_metadata_printf(session,
2868 "struct {\n");
2869 if (ret)
2870 return ret;
2871 nr_fields = type->u.struct_nestable.nr_fields;
2872 for (i = 0; i < nr_fields; i++) {
2873 const struct lttng_event_field *iter_field;
2874
2875 iter_field = &type->u.struct_nestable.fields[i];
2876 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
2877 if (ret)
2878 return ret;
2879 }
2880 ret = print_tabs(session, nesting);
2881 if (ret)
2882 return ret;
2883 alignment = type->u.struct_nestable.alignment;
2884 if (alignment) {
2885 ret = lttng_metadata_printf(session,
2886 "} align(%u)",
2887 alignment);
2888 } else {
2889 ret = lttng_metadata_printf(session,
2890 "}");
2891 }
2892 return ret;
2893 }
2894
2895 /*
2896 * Must be called with sessions_mutex held.
2897 */
2898 static
2899 int _lttng_struct_field_statedump(struct lttng_session *session,
2900 const struct lttng_event_field *field,
2901 size_t nesting)
2902 {
2903 int ret;
2904
2905 ret = _lttng_struct_type_statedump(session,
2906 &field->type, nesting);
2907 if (ret)
2908 return ret;
2909 return lttng_field_name_statedump(session, field, nesting);
2910 }
2911
2912 /*
2913 * Must be called with sessions_mutex held.
2914 */
2915 static
2916 int _lttng_variant_type_statedump(struct lttng_session *session,
2917 const struct lttng_type *type,
2918 size_t nesting)
2919 {
2920 int ret;
2921 uint32_t i, nr_choices;
2922
2923 WARN_ON_ONCE(type->atype != atype_variant_nestable);
2924 /*
2925 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
2926 */
2927 if (type->u.variant_nestable.alignment != 0)
2928 return -EINVAL;
2929 ret = print_tabs(session, nesting);
2930 if (ret)
2931 return ret;
2932 ret = lttng_metadata_printf(session,
2933 "variant <_%s> {\n",
2934 type->u.variant_nestable.tag_name);
2935 if (ret)
2936 return ret;
2937 nr_choices = type->u.variant_nestable.nr_choices;
2938 for (i = 0; i < nr_choices; i++) {
2939 const struct lttng_event_field *iter_field;
2940
2941 iter_field = &type->u.variant_nestable.choices[i];
2942 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
2943 if (ret)
2944 return ret;
2945 }
2946 ret = print_tabs(session, nesting);
2947 if (ret)
2948 return ret;
2949 ret = lttng_metadata_printf(session,
2950 "}");
2951 return ret;
2952 }
2953
2954 /*
2955 * Must be called with sessions_mutex held.
2956 */
2957 static
2958 int _lttng_variant_field_statedump(struct lttng_session *session,
2959 const struct lttng_event_field *field,
2960 size_t nesting)
2961 {
2962 int ret;
2963
2964 ret = _lttng_variant_type_statedump(session,
2965 &field->type, nesting);
2966 if (ret)
2967 return ret;
2968 return lttng_field_name_statedump(session, field, nesting);
2969 }
2970
2971 /*
2972 * Must be called with sessions_mutex held.
2973 */
2974 static
2975 int _lttng_array_field_statedump(struct lttng_session *session,
2976 const struct lttng_event_field *field,
2977 size_t nesting)
2978 {
2979 int ret;
2980 const struct lttng_type *elem_type;
2981
2982 WARN_ON_ONCE(field->type.atype != atype_array_nestable);
2983
2984 if (field->type.u.array_nestable.alignment) {
2985 ret = print_tabs(session, nesting);
2986 if (ret)
2987 return ret;
2988 ret = lttng_metadata_printf(session,
2989 "struct { } align(%u) _%s_padding;\n",
2990 field->type.u.array_nestable.alignment * CHAR_BIT,
2991 field->name);
2992 if (ret)
2993 return ret;
2994 }
2995 /*
2996 * Nested compound types: Only array of structures and variants are
2997 * currently supported.
2998 */
2999 elem_type = field->type.u.array_nestable.elem_type;
3000 switch (elem_type->atype) {
3001 case atype_integer:
3002 case atype_struct_nestable:
3003 case atype_variant_nestable:
3004 ret = _lttng_type_statedump(session, elem_type, nesting);
3005 if (ret)
3006 return ret;
3007 break;
3008
3009 default:
3010 return -EINVAL;
3011 }
3012 ret = lttng_metadata_printf(session,
3013 " _%s[%u];\n",
3014 field->name,
3015 field->type.u.array_nestable.length);
3016 return ret;
3017 }
3018
3019 /*
3020 * Must be called with sessions_mutex held.
3021 */
3022 static
3023 int _lttng_sequence_field_statedump(struct lttng_session *session,
3024 const struct lttng_event_field *field,
3025 size_t nesting)
3026 {
3027 int ret;
3028 const char *length_name;
3029 const struct lttng_type *elem_type;
3030
3031 WARN_ON_ONCE(field->type.atype != atype_sequence_nestable);
3032
3033 length_name = field->type.u.sequence_nestable.length_name;
3034
3035 if (field->type.u.sequence_nestable.alignment) {
3036 ret = print_tabs(session, nesting);
3037 if (ret)
3038 return ret;
3039 ret = lttng_metadata_printf(session,
3040 "struct { } align(%u) _%s_padding;\n",
3041 field->type.u.sequence_nestable.alignment * CHAR_BIT,
3042 field->name);
3043 if (ret)
3044 return ret;
3045 }
3046
3047 /*
3048 * Nested compound types: Only array of structures and variants are
3049 * currently supported.
3050 */
3051 elem_type = field->type.u.sequence_nestable.elem_type;
3052 switch (elem_type->atype) {
3053 case atype_integer:
3054 case atype_struct_nestable:
3055 case atype_variant_nestable:
3056 ret = _lttng_type_statedump(session, elem_type, nesting);
3057 if (ret)
3058 return ret;
3059 break;
3060
3061 default:
3062 return -EINVAL;
3063 }
3064 ret = lttng_metadata_printf(session,
3065 " _%s[ _%s ];\n",
3066 field->name,
3067 field->type.u.sequence_nestable.length_name);
3068 return ret;
3069 }
3070
3071 /*
3072 * Must be called with sessions_mutex held.
3073 */
3074 static
3075 int _lttng_enum_type_statedump(struct lttng_session *session,
3076 const struct lttng_type *type,
3077 size_t nesting)
3078 {
3079 const struct lttng_enum_desc *enum_desc;
3080 const struct lttng_type *container_type;
3081 int ret;
3082 unsigned int i, nr_entries;
3083
3084 container_type = type->u.enum_nestable.container_type;
3085 if (container_type->atype != atype_integer) {
3086 ret = -EINVAL;
3087 goto end;
3088 }
3089 enum_desc = type->u.enum_nestable.desc;
3090 nr_entries = enum_desc->nr_entries;
3091
3092 ret = print_tabs(session, nesting);
3093 if (ret)
3094 goto end;
3095 ret = lttng_metadata_printf(session, "enum : ");
3096 if (ret)
3097 goto end;
3098 ret = _lttng_integer_type_statedump(session, container_type, 0);
3099 if (ret)
3100 goto end;
3101 ret = lttng_metadata_printf(session, " {\n");
3102 if (ret)
3103 goto end;
3104 /* Dump all entries */
3105 for (i = 0; i < nr_entries; i++) {
3106 const struct lttng_enum_entry *entry = &enum_desc->entries[i];
3107 int j, len;
3108
3109 ret = print_tabs(session, nesting + 1);
3110 if (ret)
3111 goto end;
3112 ret = lttng_metadata_printf(session,
3113 "\"");
3114 if (ret)
3115 goto end;
3116 len = strlen(entry->string);
3117 /* Escape the character '"' */
3118 for (j = 0; j < len; j++) {
3119 char c = entry->string[j];
3120
3121 switch (c) {
3122 case '"':
3123 ret = lttng_metadata_printf(session,
3124 "\\\"");
3125 break;
3126 case '\\':
3127 ret = lttng_metadata_printf(session,
3128 "\\\\");
3129 break;
3130 default:
3131 ret = lttng_metadata_printf(session,
3132 "%c", c);
3133 break;
3134 }
3135 if (ret)
3136 goto end;
3137 }
3138 ret = lttng_metadata_printf(session, "\"");
3139 if (ret)
3140 goto end;
3141
3142 if (entry->options.is_auto) {
3143 ret = lttng_metadata_printf(session, ",\n");
3144 if (ret)
3145 goto end;
3146 } else {
3147 ret = lttng_metadata_printf(session,
3148 " = ");
3149 if (ret)
3150 goto end;
3151 if (entry->start.signedness)
3152 ret = lttng_metadata_printf(session,
3153 "%lld", (long long) entry->start.value);
3154 else
3155 ret = lttng_metadata_printf(session,
3156 "%llu", entry->start.value);
3157 if (ret)
3158 goto end;
3159 if (entry->start.signedness == entry->end.signedness &&
3160 entry->start.value
3161 == entry->end.value) {
3162 ret = lttng_metadata_printf(session,
3163 ",\n");
3164 } else {
3165 if (entry->end.signedness) {
3166 ret = lttng_metadata_printf(session,
3167 " ... %lld,\n",
3168 (long long) entry->end.value);
3169 } else {
3170 ret = lttng_metadata_printf(session,
3171 " ... %llu,\n",
3172 entry->end.value);
3173 }
3174 }
3175 if (ret)
3176 goto end;
3177 }
3178 }
3179 ret = print_tabs(session, nesting);
3180 if (ret)
3181 goto end;
3182 ret = lttng_metadata_printf(session, "}");
3183 end:
3184 return ret;
3185 }
3186
3187 /*
3188 * Must be called with sessions_mutex held.
3189 */
3190 static
3191 int _lttng_enum_field_statedump(struct lttng_session *session,
3192 const struct lttng_event_field *field,
3193 size_t nesting)
3194 {
3195 int ret;
3196
3197 ret = _lttng_enum_type_statedump(session, &field->type, nesting);
3198 if (ret)
3199 return ret;
3200 return lttng_field_name_statedump(session, field, nesting);
3201 }
3202
3203 static
3204 int _lttng_integer_field_statedump(struct lttng_session *session,
3205 const struct lttng_event_field *field,
3206 size_t nesting)
3207 {
3208 int ret;
3209
3210 ret = _lttng_integer_type_statedump(session, &field->type, nesting);
3211 if (ret)
3212 return ret;
3213 return lttng_field_name_statedump(session, field, nesting);
3214 }
3215
3216 static
3217 int _lttng_string_type_statedump(struct lttng_session *session,
3218 const struct lttng_type *type,
3219 size_t nesting)
3220 {
3221 int ret;
3222
3223 WARN_ON_ONCE(type->atype != atype_string);
3224 /* Default encoding is UTF8 */
3225 ret = print_tabs(session, nesting);
3226 if (ret)
3227 return ret;
3228 ret = lttng_metadata_printf(session,
3229 "string%s",
3230 type->u.string.encoding == lttng_encode_ASCII ?
3231 " { encoding = ASCII; }" : "");
3232 return ret;
3233 }
3234
3235 static
3236 int _lttng_string_field_statedump(struct lttng_session *session,
3237 const struct lttng_event_field *field,
3238 size_t nesting)
3239 {
3240 int ret;
3241
3242 WARN_ON_ONCE(field->type.atype != atype_string);
3243 ret = _lttng_string_type_statedump(session, &field->type, nesting);
3244 if (ret)
3245 return ret;
3246 return lttng_field_name_statedump(session, field, nesting);
3247 }
3248
3249 /*
3250 * Must be called with sessions_mutex held.
3251 */
3252 static
3253 int _lttng_type_statedump(struct lttng_session *session,
3254 const struct lttng_type *type,
3255 size_t nesting)
3256 {
3257 int ret = 0;
3258
3259 switch (type->atype) {
3260 case atype_integer:
3261 ret = _lttng_integer_type_statedump(session, type, nesting);
3262 break;
3263 case atype_enum_nestable:
3264 ret = _lttng_enum_type_statedump(session, type, nesting);
3265 break;
3266 case atype_string:
3267 ret = _lttng_string_type_statedump(session, type, nesting);
3268 break;
3269 case atype_struct_nestable:
3270 ret = _lttng_struct_type_statedump(session, type, nesting);
3271 break;
3272 case atype_variant_nestable:
3273 ret = _lttng_variant_type_statedump(session, type, nesting);
3274 break;
3275
3276 /* Nested arrays and sequences are not supported yet. */
3277 case atype_array_nestable:
3278 case atype_sequence_nestable:
3279 default:
3280 WARN_ON_ONCE(1);
3281 return -EINVAL;
3282 }
3283 return ret;
3284 }
3285
3286 /*
3287 * Must be called with sessions_mutex held.
3288 */
3289 static
3290 int _lttng_field_statedump(struct lttng_session *session,
3291 const struct lttng_event_field *field,
3292 size_t nesting)
3293 {
3294 int ret = 0;
3295
3296 switch (field->type.atype) {
3297 case atype_integer:
3298 ret = _lttng_integer_field_statedump(session, field, nesting);
3299 break;
3300 case atype_enum_nestable:
3301 ret = _lttng_enum_field_statedump(session, field, nesting);
3302 break;
3303 case atype_string:
3304 ret = _lttng_string_field_statedump(session, field, nesting);
3305 break;
3306 case atype_struct_nestable:
3307 ret = _lttng_struct_field_statedump(session, field, nesting);
3308 break;
3309 case atype_array_nestable:
3310 ret = _lttng_array_field_statedump(session, field, nesting);
3311 break;
3312 case atype_sequence_nestable:
3313 ret = _lttng_sequence_field_statedump(session, field, nesting);
3314 break;
3315 case atype_variant_nestable:
3316 ret = _lttng_variant_field_statedump(session, field, nesting);
3317 break;
3318
3319 default:
3320 WARN_ON_ONCE(1);
3321 return -EINVAL;
3322 }
3323 return ret;
3324 }
3325
3326 static
3327 int _lttng_context_metadata_statedump(struct lttng_session *session,
3328 struct lttng_ctx *ctx)
3329 {
3330 int ret = 0;
3331 int i;
3332
3333 if (!ctx)
3334 return 0;
3335 for (i = 0; i < ctx->nr_fields; i++) {
3336 const struct lttng_ctx_field *field = &ctx->fields[i];
3337
3338 ret = _lttng_field_statedump(session, &field->event_field, 2);
3339 if (ret)
3340 return ret;
3341 }
3342 return ret;
3343 }
3344
3345 static
3346 int _lttng_fields_metadata_statedump(struct lttng_session *session,
3347 struct lttng_event *event)
3348 {
3349 const struct lttng_event_desc *desc = event->desc;
3350 int ret = 0;
3351 int i;
3352
3353 for (i = 0; i < desc->nr_fields; i++) {
3354 const struct lttng_event_field *field = &desc->fields[i];
3355
3356 ret = _lttng_field_statedump(session, field, 2);
3357 if (ret)
3358 return ret;
3359 }
3360 return ret;
3361 }
3362
3363 /*
3364 * Must be called with sessions_mutex held.
3365 * The entire event metadata is printed as a single atomic metadata
3366 * transaction.
3367 */
3368 static
3369 int _lttng_event_metadata_statedump(struct lttng_session *session,
3370 struct lttng_channel *chan,
3371 struct lttng_event *event)
3372 {
3373 int ret = 0;
3374
3375 if (event->metadata_dumped || !LTTNG_READ_ONCE(session->active))
3376 return 0;
3377 if (chan->channel_type == METADATA_CHANNEL)
3378 return 0;
3379
3380 lttng_metadata_begin(session);
3381
3382 ret = lttng_metadata_printf(session,
3383 "event {\n"
3384 " name = \"%s\";\n"
3385 " id = %u;\n"
3386 " stream_id = %u;\n",
3387 event->desc->name,
3388 event->id,
3389 event->chan->id);
3390 if (ret)
3391 goto end;
3392
3393 if (event->ctx) {
3394 ret = lttng_metadata_printf(session,
3395 " context := struct {\n");
3396 if (ret)
3397 goto end;
3398 }
3399 ret = _lttng_context_metadata_statedump(session, event->ctx);
3400 if (ret)
3401 goto end;
3402 if (event->ctx) {
3403 ret = lttng_metadata_printf(session,
3404 " };\n");
3405 if (ret)
3406 goto end;
3407 }
3408
3409 ret = lttng_metadata_printf(session,
3410 " fields := struct {\n"
3411 );
3412 if (ret)
3413 goto end;
3414
3415 ret = _lttng_fields_metadata_statedump(session, event);
3416 if (ret)
3417 goto end;
3418
3419 /*
3420 * LTTng space reservation can only reserve multiples of the
3421 * byte size.
3422 */
3423 ret = lttng_metadata_printf(session,
3424 " };\n"
3425 "};\n\n");
3426 if (ret)
3427 goto end;
3428
3429 event->metadata_dumped = 1;
3430 end:
3431 lttng_metadata_end(session);
3432 return ret;
3433
3434 }
3435
3436 /*
3437 * Must be called with sessions_mutex held.
3438 * The entire channel metadata is printed as a single atomic metadata
3439 * transaction.
3440 */
3441 static
3442 int _lttng_channel_metadata_statedump(struct lttng_session *session,
3443 struct lttng_channel *chan)
3444 {
3445 int ret = 0;
3446
3447 if (chan->metadata_dumped || !LTTNG_READ_ONCE(session->active))
3448 return 0;
3449
3450 if (chan->channel_type == METADATA_CHANNEL)
3451 return 0;
3452
3453 lttng_metadata_begin(session);
3454
3455 WARN_ON_ONCE(!chan->header_type);
3456 ret = lttng_metadata_printf(session,
3457 "stream {\n"
3458 " id = %u;\n"
3459 " event.header := %s;\n"
3460 " packet.context := struct packet_context;\n",
3461 chan->id,
3462 chan->header_type == 1 ? "struct event_header_compact" :
3463 "struct event_header_large");
3464 if (ret)
3465 goto end;
3466
3467 if (chan->ctx) {
3468 ret = lttng_metadata_printf(session,
3469 " event.context := struct {\n");
3470 if (ret)
3471 goto end;
3472 }
3473 ret = _lttng_context_metadata_statedump(session, chan->ctx);
3474 if (ret)
3475 goto end;
3476 if (chan->ctx) {
3477 ret = lttng_metadata_printf(session,
3478 " };\n");
3479 if (ret)
3480 goto end;
3481 }
3482
3483 ret = lttng_metadata_printf(session,
3484 "};\n\n");
3485
3486 chan->metadata_dumped = 1;
3487 end:
3488 lttng_metadata_end(session);
3489 return ret;
3490 }
3491
3492 /*
3493 * Must be called with sessions_mutex held.
3494 */
3495 static
3496 int _lttng_stream_packet_context_declare(struct lttng_session *session)
3497 {
3498 return lttng_metadata_printf(session,
3499 "struct packet_context {\n"
3500 " uint64_clock_monotonic_t timestamp_begin;\n"
3501 " uint64_clock_monotonic_t timestamp_end;\n"
3502 " uint64_t content_size;\n"
3503 " uint64_t packet_size;\n"
3504 " uint64_t packet_seq_num;\n"
3505 " unsigned long events_discarded;\n"
3506 " uint32_t cpu_id;\n"
3507 "};\n\n"
3508 );
3509 }
3510
3511 /*
3512 * Compact header:
3513 * id: range: 0 - 30.
3514 * id 31 is reserved to indicate an extended header.
3515 *
3516 * Large header:
3517 * id: range: 0 - 65534.
3518 * id 65535 is reserved to indicate an extended header.
3519 *
3520 * Must be called with sessions_mutex held.
3521 */
3522 static
3523 int _lttng_event_header_declare(struct lttng_session *session)
3524 {
3525 return lttng_metadata_printf(session,
3526 "struct event_header_compact {\n"
3527 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
3528 " variant <id> {\n"
3529 " struct {\n"
3530 " uint27_clock_monotonic_t timestamp;\n"
3531 " } compact;\n"
3532 " struct {\n"
3533 " uint32_t id;\n"
3534 " uint64_clock_monotonic_t timestamp;\n"
3535 " } extended;\n"
3536 " } v;\n"
3537 "} align(%u);\n"
3538 "\n"
3539 "struct event_header_large {\n"
3540 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
3541 " variant <id> {\n"
3542 " struct {\n"
3543 " uint32_clock_monotonic_t timestamp;\n"
3544 " } compact;\n"
3545 " struct {\n"
3546 " uint32_t id;\n"
3547 " uint64_clock_monotonic_t timestamp;\n"
3548 " } extended;\n"
3549 " } v;\n"
3550 "} align(%u);\n\n",
3551 lttng_alignof(uint32_t) * CHAR_BIT,
3552 lttng_alignof(uint16_t) * CHAR_BIT
3553 );
3554 }
3555
3556 /*
3557 * Approximation of NTP time of day to clock monotonic correlation,
3558 * taken at start of trace.
3559 * Yes, this is only an approximation. Yes, we can (and will) do better
3560 * in future versions.
3561 * This function may return a negative offset. It may happen if the
3562 * system sets the REALTIME clock to 0 after boot.
3563 *
3564 * Use 64bit timespec on kernels that have it, this makes 32bit arch
3565 * y2038 compliant.
3566 */
3567 static
3568 int64_t measure_clock_offset(void)
3569 {
3570 uint64_t monotonic_avg, monotonic[2], realtime;
3571 uint64_t tcf = trace_clock_freq();
3572 int64_t offset;
3573 unsigned long flags;
3574 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3575 struct timespec64 rts = { 0, 0 };
3576 #else
3577 struct timespec rts = { 0, 0 };
3578 #endif
3579
3580 /* Disable interrupts to increase correlation precision. */
3581 local_irq_save(flags);
3582 monotonic[0] = trace_clock_read64();
3583 #ifdef LTTNG_KERNEL_HAS_TIMESPEC64
3584 ktime_get_real_ts64(&rts);
3585 #else
3586 getnstimeofday(&rts);
3587 #endif
3588 monotonic[1] = trace_clock_read64();
3589 local_irq_restore(flags);
3590
3591 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
3592 realtime = (uint64_t) rts.tv_sec * tcf;
3593 if (tcf == NSEC_PER_SEC) {
3594 realtime += rts.tv_nsec;
3595 } else {
3596 uint64_t n = rts.tv_nsec * tcf;
3597
3598 do_div(n, NSEC_PER_SEC);
3599 realtime += n;
3600 }
3601 offset = (int64_t) realtime - monotonic_avg;
3602 return offset;
3603 }
3604
3605 static
3606 int print_escaped_ctf_string(struct lttng_session *session, const char *string)
3607 {
3608 int ret = 0;
3609 size_t i;
3610 char cur;
3611
3612 i = 0;
3613 cur = string[i];
3614 while (cur != '\0') {
3615 switch (cur) {
3616 case '\n':
3617 ret = lttng_metadata_printf(session, "%s", "\\n");
3618 break;
3619 case '\\':
3620 case '"':
3621 ret = lttng_metadata_printf(session, "%c", '\\');
3622 if (ret)
3623 goto error;
3624 /* We still print the current char */
3625 /* Fallthrough */
3626 default:
3627 ret = lttng_metadata_printf(session, "%c", cur);
3628 break;
3629 }
3630
3631 if (ret)
3632 goto error;
3633
3634 cur = string[++i];
3635 }
3636 error:
3637 return ret;
3638 }
3639
3640 static
3641 int print_metadata_escaped_field(struct lttng_session *session, const char *field,
3642 const char *field_value)
3643 {
3644 int ret;
3645
3646 ret = lttng_metadata_printf(session, " %s = \"", field);
3647 if (ret)
3648 goto error;
3649
3650 ret = print_escaped_ctf_string(session, field_value);
3651 if (ret)
3652 goto error;
3653
3654 ret = lttng_metadata_printf(session, "\";\n");
3655
3656 error:
3657 return ret;
3658 }
3659
3660 /*
3661 * Output metadata into this session's metadata buffers.
3662 * Must be called with sessions_mutex held.
3663 */
3664 static
3665 int _lttng_session_metadata_statedump(struct lttng_session *session)
3666 {
3667 unsigned char *uuid_c = session->uuid.b;
3668 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
3669 const char *product_uuid;
3670 struct lttng_channel *chan;
3671 struct lttng_event *event;
3672 int ret = 0;
3673
3674 if (!LTTNG_READ_ONCE(session->active))
3675 return 0;
3676
3677 lttng_metadata_begin(session);
3678
3679 if (session->metadata_dumped)
3680 goto skip_session;
3681
3682 snprintf(uuid_s, sizeof(uuid_s),
3683 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
3684 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
3685 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
3686 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
3687 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
3688
3689 ret = lttng_metadata_printf(session,
3690 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
3691 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
3692 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
3693 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
3694 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
3695 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
3696 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
3697 "\n"
3698 "trace {\n"
3699 " major = %u;\n"
3700 " minor = %u;\n"
3701 " uuid = \"%s\";\n"
3702 " byte_order = %s;\n"
3703 " packet.header := struct {\n"
3704 " uint32_t magic;\n"
3705 " uint8_t uuid[16];\n"
3706 " uint32_t stream_id;\n"
3707 " uint64_t stream_instance_id;\n"
3708 " };\n"
3709 "};\n\n",
3710 lttng_alignof(uint8_t) * CHAR_BIT,
3711 lttng_alignof(uint16_t) * CHAR_BIT,
3712 lttng_alignof(uint32_t) * CHAR_BIT,
3713 lttng_alignof(uint64_t) * CHAR_BIT,
3714 sizeof(unsigned long) * CHAR_BIT,
3715 lttng_alignof(unsigned long) * CHAR_BIT,
3716 CTF_SPEC_MAJOR,
3717 CTF_SPEC_MINOR,
3718 uuid_s,
3719 #if __BYTE_ORDER == __BIG_ENDIAN
3720 "be"
3721 #else
3722 "le"
3723 #endif
3724 );
3725 if (ret)
3726 goto end;
3727
3728 ret = lttng_metadata_printf(session,
3729 "env {\n"
3730 " hostname = \"%s\";\n"
3731 " domain = \"kernel\";\n"
3732 " sysname = \"%s\";\n"
3733 " kernel_release = \"%s\";\n"
3734 " kernel_version = \"%s\";\n"
3735 " tracer_name = \"lttng-modules\";\n"
3736 " tracer_major = %d;\n"
3737 " tracer_minor = %d;\n"
3738 " tracer_patchlevel = %d;\n"
3739 " trace_buffering_scheme = \"global\";\n",
3740 current->nsproxy->uts_ns->name.nodename,
3741 utsname()->sysname,
3742 utsname()->release,
3743 utsname()->version,
3744 LTTNG_MODULES_MAJOR_VERSION,
3745 LTTNG_MODULES_MINOR_VERSION,
3746 LTTNG_MODULES_PATCHLEVEL_VERSION
3747 );
3748 if (ret)
3749 goto end;
3750
3751 ret = print_metadata_escaped_field(session, "trace_name", session->name);
3752 if (ret)
3753 goto end;
3754 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
3755 session->creation_time);
3756 if (ret)
3757 goto end;
3758
3759 /* Add the product UUID to the 'env' section */
3760 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
3761 if (product_uuid) {
3762 ret = lttng_metadata_printf(session,
3763 " product_uuid = \"%s\";\n",
3764 product_uuid
3765 );
3766 if (ret)
3767 goto end;
3768 }
3769
3770 /* Close the 'env' section */
3771 ret = lttng_metadata_printf(session, "};\n\n");
3772 if (ret)
3773 goto end;
3774
3775 ret = lttng_metadata_printf(session,
3776 "clock {\n"
3777 " name = \"%s\";\n",
3778 trace_clock_name()
3779 );
3780 if (ret)
3781 goto end;
3782
3783 if (!trace_clock_uuid(clock_uuid_s)) {
3784 ret = lttng_metadata_printf(session,
3785 " uuid = \"%s\";\n",
3786 clock_uuid_s
3787 );
3788 if (ret)
3789 goto end;
3790 }
3791
3792 ret = lttng_metadata_printf(session,
3793 " description = \"%s\";\n"
3794 " freq = %llu; /* Frequency, in Hz */\n"
3795 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
3796 " offset = %lld;\n"
3797 "};\n\n",
3798 trace_clock_description(),
3799 (unsigned long long) trace_clock_freq(),
3800 (long long) measure_clock_offset()
3801 );
3802 if (ret)
3803 goto end;
3804
3805 ret = lttng_metadata_printf(session,
3806 "typealias integer {\n"
3807 " size = 27; align = 1; signed = false;\n"
3808 " map = clock.%s.value;\n"
3809 "} := uint27_clock_monotonic_t;\n"
3810 "\n"
3811 "typealias integer {\n"
3812 " size = 32; align = %u; signed = false;\n"
3813 " map = clock.%s.value;\n"
3814 "} := uint32_clock_monotonic_t;\n"
3815 "\n"
3816 "typealias integer {\n"
3817 " size = 64; align = %u; signed = false;\n"
3818 " map = clock.%s.value;\n"
3819 "} := uint64_clock_monotonic_t;\n\n",
3820 trace_clock_name(),
3821 lttng_alignof(uint32_t) * CHAR_BIT,
3822 trace_clock_name(),
3823 lttng_alignof(uint64_t) * CHAR_BIT,
3824 trace_clock_name()
3825 );
3826 if (ret)
3827 goto end;
3828
3829 ret = _lttng_stream_packet_context_declare(session);
3830 if (ret)
3831 goto end;
3832
3833 ret = _lttng_event_header_declare(session);
3834 if (ret)
3835 goto end;
3836
3837 skip_session:
3838 list_for_each_entry(chan, &session->chan, list) {
3839 ret = _lttng_channel_metadata_statedump(session, chan);
3840 if (ret)
3841 goto end;
3842 }
3843
3844 list_for_each_entry(event, &session->events, list) {
3845 ret = _lttng_event_metadata_statedump(session, event->chan, event);
3846 if (ret)
3847 goto end;
3848 }
3849 session->metadata_dumped = 1;
3850 end:
3851 lttng_metadata_end(session);
3852 return ret;
3853 }
3854
3855 /**
3856 * lttng_transport_register - LTT transport registration
3857 * @transport: transport structure
3858 *
3859 * Registers a transport which can be used as output to extract the data out of
3860 * LTTng. The module calling this registration function must ensure that no
3861 * trap-inducing code will be executed by the transport functions. E.g.
3862 * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
3863 * is made visible to the transport function. This registration acts as a
3864 * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
3865 * after its registration must it synchronize the TLBs.
3866 */
3867 void lttng_transport_register(struct lttng_transport *transport)
3868 {
3869 /*
3870 * Make sure no page fault can be triggered by the module about to be
3871 * registered. We deal with this here so we don't have to call
3872 * vmalloc_sync_mappings() in each module's init.
3873 */
3874 wrapper_vmalloc_sync_mappings();
3875
3876 mutex_lock(&sessions_mutex);
3877 list_add_tail(&transport->node, &lttng_transport_list);
3878 mutex_unlock(&sessions_mutex);
3879 }
3880 EXPORT_SYMBOL_GPL(lttng_transport_register);
3881
3882 /**
3883 * lttng_transport_unregister - LTT transport unregistration
3884 * @transport: transport structure
3885 */
3886 void lttng_transport_unregister(struct lttng_transport *transport)
3887 {
3888 mutex_lock(&sessions_mutex);
3889 list_del(&transport->node);
3890 mutex_unlock(&sessions_mutex);
3891 }
3892 EXPORT_SYMBOL_GPL(lttng_transport_unregister);
3893
3894 void lttng_counter_transport_register(struct lttng_counter_transport *transport)
3895 {
3896 /*
3897 * Make sure no page fault can be triggered by the module about to be
3898 * registered. We deal with this here so we don't have to call
3899 * vmalloc_sync_mappings() in each module's init.
3900 */
3901 wrapper_vmalloc_sync_mappings();
3902
3903 mutex_lock(&sessions_mutex);
3904 list_add_tail(&transport->node, &lttng_counter_transport_list);
3905 mutex_unlock(&sessions_mutex);
3906 }
3907 EXPORT_SYMBOL_GPL(lttng_counter_transport_register);
3908
3909 void lttng_counter_transport_unregister(struct lttng_counter_transport *transport)
3910 {
3911 mutex_lock(&sessions_mutex);
3912 list_del(&transport->node);
3913 mutex_unlock(&sessions_mutex);
3914 }
3915 EXPORT_SYMBOL_GPL(lttng_counter_transport_unregister);
3916
3917 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
3918
3919 enum cpuhp_state lttng_hp_prepare;
3920 enum cpuhp_state lttng_hp_online;
3921
3922 static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
3923 {
3924 struct lttng_cpuhp_node *lttng_node;
3925
3926 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
3927 switch (lttng_node->component) {
3928 case LTTNG_RING_BUFFER_FRONTEND:
3929 return 0;
3930 case LTTNG_RING_BUFFER_BACKEND:
3931 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
3932 case LTTNG_RING_BUFFER_ITER:
3933 return 0;
3934 case LTTNG_CONTEXT_PERF_COUNTERS:
3935 return 0;
3936 default:
3937 return -EINVAL;
3938 }
3939 }
3940
3941 static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
3942 {
3943 struct lttng_cpuhp_node *lttng_node;
3944
3945 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
3946 switch (lttng_node->component) {
3947 case LTTNG_RING_BUFFER_FRONTEND:
3948 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
3949 case LTTNG_RING_BUFFER_BACKEND:
3950 return 0;
3951 case LTTNG_RING_BUFFER_ITER:
3952 return 0;
3953 case LTTNG_CONTEXT_PERF_COUNTERS:
3954 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
3955 default:
3956 return -EINVAL;
3957 }
3958 }
3959
3960 static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
3961 {
3962 struct lttng_cpuhp_node *lttng_node;
3963
3964 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
3965 switch (lttng_node->component) {
3966 case LTTNG_RING_BUFFER_FRONTEND:
3967 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
3968 case LTTNG_RING_BUFFER_BACKEND:
3969 return 0;
3970 case LTTNG_RING_BUFFER_ITER:
3971 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
3972 case LTTNG_CONTEXT_PERF_COUNTERS:
3973 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
3974 default:
3975 return -EINVAL;
3976 }
3977 }
3978
3979 static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
3980 {
3981 struct lttng_cpuhp_node *lttng_node;
3982
3983 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
3984 switch (lttng_node->component) {
3985 case LTTNG_RING_BUFFER_FRONTEND:
3986 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
3987 case LTTNG_RING_BUFFER_BACKEND:
3988 return 0;
3989 case LTTNG_RING_BUFFER_ITER:
3990 return 0;
3991 case LTTNG_CONTEXT_PERF_COUNTERS:
3992 return 0;
3993 default:
3994 return -EINVAL;
3995 }
3996 }
3997
3998 static int __init lttng_init_cpu_hotplug(void)
3999 {
4000 int ret;
4001
4002 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
4003 lttng_hotplug_prepare,
4004 lttng_hotplug_dead);
4005 if (ret < 0) {
4006 return ret;
4007 }
4008 lttng_hp_prepare = ret;
4009 lttng_rb_set_hp_prepare(ret);
4010
4011 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
4012 lttng_hotplug_online,
4013 lttng_hotplug_offline);
4014 if (ret < 0) {
4015 cpuhp_remove_multi_state(lttng_hp_prepare);
4016 lttng_hp_prepare = 0;
4017 return ret;
4018 }
4019 lttng_hp_online = ret;
4020 lttng_rb_set_hp_online(ret);
4021
4022 return 0;
4023 }
4024
4025 static void __exit lttng_exit_cpu_hotplug(void)
4026 {
4027 lttng_rb_set_hp_online(0);
4028 cpuhp_remove_multi_state(lttng_hp_online);
4029 lttng_rb_set_hp_prepare(0);
4030 cpuhp_remove_multi_state(lttng_hp_prepare);
4031 }
4032
4033 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
4034 static int lttng_init_cpu_hotplug(void)
4035 {
4036 return 0;
4037 }
4038 static void lttng_exit_cpu_hotplug(void)
4039 {
4040 }
4041 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
4042
4043
4044 static int __init lttng_events_init(void)
4045 {
4046 int ret;
4047
4048 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
4049 if (ret)
4050 return ret;
4051 ret = wrapper_get_pfnblock_flags_mask_init();
4052 if (ret)
4053 return ret;
4054 ret = wrapper_get_pageblock_flags_mask_init();
4055 if (ret)
4056 return ret;
4057 ret = lttng_probes_init();
4058 if (ret)
4059 return ret;
4060 ret = lttng_context_init();
4061 if (ret)
4062 return ret;
4063 ret = lttng_tracepoint_init();
4064 if (ret)
4065 goto error_tp;
4066 event_cache = KMEM_CACHE(lttng_event, 0);
4067 if (!event_cache) {
4068 ret = -ENOMEM;
4069 goto error_kmem_event;
4070 }
4071 event_notifier_cache = KMEM_CACHE(lttng_event_notifier, 0);
4072 if (!event_notifier_cache) {
4073 ret = -ENOMEM;
4074 goto error_kmem_event_notifier;
4075 }
4076 ret = lttng_abi_init();
4077 if (ret)
4078 goto error_abi;
4079 ret = lttng_logger_init();
4080 if (ret)
4081 goto error_logger;
4082 ret = lttng_init_cpu_hotplug();
4083 if (ret)
4084 goto error_hotplug;
4085 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
4086 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4087 __stringify(LTTNG_MODULES_MINOR_VERSION),
4088 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4089 LTTNG_MODULES_EXTRAVERSION,
4090 LTTNG_VERSION_NAME,
4091 #ifdef LTTNG_EXTRA_VERSION_GIT
4092 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4093 #else
4094 "",
4095 #endif
4096 #ifdef LTTNG_EXTRA_VERSION_NAME
4097 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4098 #else
4099 "");
4100 #endif
4101 return 0;
4102
4103 error_hotplug:
4104 lttng_logger_exit();
4105 error_logger:
4106 lttng_abi_exit();
4107 error_abi:
4108 kmem_cache_destroy(event_notifier_cache);
4109 error_kmem_event_notifier:
4110 kmem_cache_destroy(event_cache);
4111 error_kmem_event:
4112 lttng_tracepoint_exit();
4113 error_tp:
4114 lttng_context_exit();
4115 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
4116 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4117 __stringify(LTTNG_MODULES_MINOR_VERSION),
4118 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4119 LTTNG_MODULES_EXTRAVERSION,
4120 LTTNG_VERSION_NAME,
4121 #ifdef LTTNG_EXTRA_VERSION_GIT
4122 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4123 #else
4124 "",
4125 #endif
4126 #ifdef LTTNG_EXTRA_VERSION_NAME
4127 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4128 #else
4129 "");
4130 #endif
4131 return ret;
4132 }
4133
4134 module_init(lttng_events_init);
4135
4136 static void __exit lttng_events_exit(void)
4137 {
4138 struct lttng_session *session, *tmpsession;
4139
4140 lttng_exit_cpu_hotplug();
4141 lttng_logger_exit();
4142 lttng_abi_exit();
4143 list_for_each_entry_safe(session, tmpsession, &sessions, list)
4144 lttng_session_destroy(session);
4145 kmem_cache_destroy(event_cache);
4146 kmem_cache_destroy(event_notifier_cache);
4147 lttng_tracepoint_exit();
4148 lttng_context_exit();
4149 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
4150 __stringify(LTTNG_MODULES_MAJOR_VERSION),
4151 __stringify(LTTNG_MODULES_MINOR_VERSION),
4152 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
4153 LTTNG_MODULES_EXTRAVERSION,
4154 LTTNG_VERSION_NAME,
4155 #ifdef LTTNG_EXTRA_VERSION_GIT
4156 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
4157 #else
4158 "",
4159 #endif
4160 #ifdef LTTNG_EXTRA_VERSION_NAME
4161 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
4162 #else
4163 "");
4164 #endif
4165 }
4166
4167 module_exit(lttng_events_exit);
4168
4169 #include <generated/patches.h>
4170 #ifdef LTTNG_EXTRA_VERSION_GIT
4171 MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
4172 #endif
4173 #ifdef LTTNG_EXTRA_VERSION_NAME
4174 MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
4175 #endif
4176 MODULE_LICENSE("GPL and additional rights");
4177 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
4178 MODULE_DESCRIPTION("LTTng tracer");
4179 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
4180 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
4181 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
4182 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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