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Move headers under include/
[lttng-modules.git] / 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 #include <linux/module.h>
11 #include <linux/mutex.h>
12 #include <linux/sched.h>
13 #include <linux/slab.h>
14 #include <linux/jiffies.h>
15 #include <linux/utsname.h>
16 #include <linux/err.h>
17 #include <linux/seq_file.h>
18 #include <linux/file.h>
19 #include <linux/anon_inodes.h>
20 #include <linux/jhash.h>
21 #include <linux/uaccess.h>
22 #include <linux/uuid.h>
23 #include <linux/dmi.h>
24 #include <linux/vmalloc.h>
25 #include <linux/limits.h>
26
27 #include <linux/random.h>
28 #include <lttng/lttng-kernel-version.h>
29 #include <lttng/lttng-events.h>
30 #include <lttng/lttng-tracer.h>
31 #include <lttng/lttng-abi-old.h>
32 #include <lttng/lttng-endian.h>
33 #include <lttng/lttng-string-utils.h>
34 #include <lttng/lttng-tracepoint.h>
35 #include <ringbuffer/backend.h>
36 #include <ringbuffer/frontend.h>
37
38 #define METADATA_CACHE_DEFAULT_SIZE 4096
39
40 static LIST_HEAD(sessions);
41 static LIST_HEAD(lttng_transport_list);
42 /*
43 * Protect the sessions and metadata caches.
44 */
45 static DEFINE_MUTEX(sessions_mutex);
46 static struct kmem_cache *event_cache;
47
48 static void lttng_session_lazy_sync_enablers(struct lttng_session *session);
49 static void lttng_session_sync_enablers(struct lttng_session *session);
50 static void lttng_enabler_destroy(struct lttng_enabler *enabler);
51
52 static void _lttng_event_destroy(struct lttng_event *event);
53 static void _lttng_channel_destroy(struct lttng_channel *chan);
54 static int _lttng_event_unregister(struct lttng_event *event);
55 static
56 int _lttng_event_metadata_statedump(struct lttng_session *session,
57 struct lttng_channel *chan,
58 struct lttng_event *event);
59 static
60 int _lttng_session_metadata_statedump(struct lttng_session *session);
61 static
62 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
63 static
64 int _lttng_type_statedump(struct lttng_session *session,
65 const struct lttng_type *type,
66 size_t nesting);
67 static
68 int _lttng_field_statedump(struct lttng_session *session,
69 const struct lttng_event_field *field,
70 size_t nesting);
71
72 void synchronize_trace(void)
73 {
74 synchronize_rcu();
75 }
76
77 void lttng_lock_sessions(void)
78 {
79 mutex_lock(&sessions_mutex);
80 }
81
82 void lttng_unlock_sessions(void)
83 {
84 mutex_unlock(&sessions_mutex);
85 }
86
87 /*
88 * Called with sessions lock held.
89 */
90 int lttng_session_active(void)
91 {
92 struct lttng_session *iter;
93
94 list_for_each_entry(iter, &sessions, list) {
95 if (iter->active)
96 return 1;
97 }
98 return 0;
99 }
100
101 struct lttng_session *lttng_session_create(void)
102 {
103 struct lttng_session *session;
104 struct lttng_metadata_cache *metadata_cache;
105 int i;
106
107 mutex_lock(&sessions_mutex);
108 session = kvzalloc_node(sizeof(struct lttng_session), GFP_KERNEL,
109 NUMA_NO_NODE);
110 if (!session)
111 goto err;
112 INIT_LIST_HEAD(&session->chan);
113 INIT_LIST_HEAD(&session->events);
114 guid_gen(&session->uuid);
115
116 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
117 GFP_KERNEL);
118 if (!metadata_cache)
119 goto err_free_session;
120 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
121 if (!metadata_cache->data)
122 goto err_free_cache;
123 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
124 kref_init(&metadata_cache->refcount);
125 mutex_init(&metadata_cache->lock);
126 session->metadata_cache = metadata_cache;
127 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
128 memcpy(&metadata_cache->uuid, &session->uuid,
129 sizeof(metadata_cache->uuid));
130 INIT_LIST_HEAD(&session->enablers_head);
131 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
132 INIT_HLIST_HEAD(&session->events_ht.table[i]);
133 list_add(&session->list, &sessions);
134 session->pid_tracker.session = session;
135 session->pid_tracker.tracker_type = TRACKER_PID;
136 session->vpid_tracker.session = session;
137 session->vpid_tracker.tracker_type = TRACKER_VPID;
138 session->uid_tracker.session = session;
139 session->uid_tracker.tracker_type = TRACKER_UID;
140 session->vuid_tracker.session = session;
141 session->vuid_tracker.tracker_type = TRACKER_VUID;
142 session->gid_tracker.session = session;
143 session->gid_tracker.tracker_type = TRACKER_GID;
144 session->vgid_tracker.session = session;
145 session->vgid_tracker.tracker_type = TRACKER_VGID;
146 mutex_unlock(&sessions_mutex);
147 return session;
148
149 err_free_cache:
150 kfree(metadata_cache);
151 err_free_session:
152 kvfree(session);
153 err:
154 mutex_unlock(&sessions_mutex);
155 return NULL;
156 }
157
158 void metadata_cache_destroy(struct kref *kref)
159 {
160 struct lttng_metadata_cache *cache =
161 container_of(kref, struct lttng_metadata_cache, refcount);
162 vfree(cache->data);
163 kfree(cache);
164 }
165
166 void lttng_session_destroy(struct lttng_session *session)
167 {
168 struct lttng_channel *chan, *tmpchan;
169 struct lttng_event *event, *tmpevent;
170 struct lttng_metadata_stream *metadata_stream;
171 struct lttng_enabler *enabler, *tmpenabler;
172 int ret;
173
174 mutex_lock(&sessions_mutex);
175 WRITE_ONCE(session->active, 0);
176 list_for_each_entry(chan, &session->chan, list) {
177 ret = lttng_syscalls_unregister(chan);
178 WARN_ON(ret);
179 }
180 list_for_each_entry(event, &session->events, list) {
181 ret = _lttng_event_unregister(event);
182 WARN_ON(ret);
183 }
184 synchronize_trace(); /* Wait for in-flight events to complete */
185 list_for_each_entry_safe(enabler, tmpenabler,
186 &session->enablers_head, node)
187 lttng_enabler_destroy(enabler);
188 list_for_each_entry_safe(event, tmpevent, &session->events, list)
189 _lttng_event_destroy(event);
190 list_for_each_entry_safe(chan, tmpchan, &session->chan, list) {
191 BUG_ON(chan->channel_type == METADATA_CHANNEL);
192 _lttng_channel_destroy(chan);
193 }
194 list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list)
195 _lttng_metadata_channel_hangup(metadata_stream);
196 lttng_id_tracker_destroy(&session->pid_tracker, false);
197 lttng_id_tracker_destroy(&session->vpid_tracker, false);
198 lttng_id_tracker_destroy(&session->uid_tracker, false);
199 lttng_id_tracker_destroy(&session->vuid_tracker, false);
200 lttng_id_tracker_destroy(&session->gid_tracker, false);
201 lttng_id_tracker_destroy(&session->vgid_tracker, false);
202 kref_put(&session->metadata_cache->refcount, metadata_cache_destroy);
203 list_del(&session->list);
204 mutex_unlock(&sessions_mutex);
205 kvfree(session);
206 }
207
208 int lttng_session_statedump(struct lttng_session *session)
209 {
210 int ret;
211
212 mutex_lock(&sessions_mutex);
213 ret = lttng_statedump_start(session);
214 mutex_unlock(&sessions_mutex);
215 return ret;
216 }
217
218 int lttng_session_enable(struct lttng_session *session)
219 {
220 int ret = 0;
221 struct lttng_channel *chan;
222
223 mutex_lock(&sessions_mutex);
224 if (session->active) {
225 ret = -EBUSY;
226 goto end;
227 }
228
229 /* Set transient enabler state to "enabled" */
230 session->tstate = 1;
231
232 /* We need to sync enablers with session before activation. */
233 lttng_session_sync_enablers(session);
234
235 /*
236 * Snapshot the number of events per channel to know the type of header
237 * we need to use.
238 */
239 list_for_each_entry(chan, &session->chan, list) {
240 if (chan->header_type)
241 continue; /* don't change it if session stop/restart */
242 if (chan->free_event_id < 31)
243 chan->header_type = 1; /* compact */
244 else
245 chan->header_type = 2; /* large */
246 }
247
248 /* Clear each stream's quiescent state. */
249 list_for_each_entry(chan, &session->chan, list) {
250 if (chan->channel_type != METADATA_CHANNEL)
251 lib_ring_buffer_clear_quiescent_channel(chan->chan);
252 }
253
254 WRITE_ONCE(session->active, 1);
255 WRITE_ONCE(session->been_active, 1);
256 ret = _lttng_session_metadata_statedump(session);
257 if (ret) {
258 WRITE_ONCE(session->active, 0);
259 goto end;
260 }
261 ret = lttng_statedump_start(session);
262 if (ret)
263 WRITE_ONCE(session->active, 0);
264 end:
265 mutex_unlock(&sessions_mutex);
266 return ret;
267 }
268
269 int lttng_session_disable(struct lttng_session *session)
270 {
271 int ret = 0;
272 struct lttng_channel *chan;
273
274 mutex_lock(&sessions_mutex);
275 if (!session->active) {
276 ret = -EBUSY;
277 goto end;
278 }
279 WRITE_ONCE(session->active, 0);
280
281 /* Set transient enabler state to "disabled" */
282 session->tstate = 0;
283 lttng_session_sync_enablers(session);
284
285 /* Set each stream's quiescent state. */
286 list_for_each_entry(chan, &session->chan, list) {
287 if (chan->channel_type != METADATA_CHANNEL)
288 lib_ring_buffer_set_quiescent_channel(chan->chan);
289 }
290 end:
291 mutex_unlock(&sessions_mutex);
292 return ret;
293 }
294
295 int lttng_session_metadata_regenerate(struct lttng_session *session)
296 {
297 int ret = 0;
298 struct lttng_channel *chan;
299 struct lttng_event *event;
300 struct lttng_metadata_cache *cache = session->metadata_cache;
301 struct lttng_metadata_stream *stream;
302
303 mutex_lock(&sessions_mutex);
304 if (!session->active) {
305 ret = -EBUSY;
306 goto end;
307 }
308
309 mutex_lock(&cache->lock);
310 memset(cache->data, 0, cache->cache_alloc);
311 cache->metadata_written = 0;
312 cache->version++;
313 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) {
314 stream->metadata_out = 0;
315 stream->metadata_in = 0;
316 }
317 mutex_unlock(&cache->lock);
318
319 session->metadata_dumped = 0;
320 list_for_each_entry(chan, &session->chan, list) {
321 chan->metadata_dumped = 0;
322 }
323
324 list_for_each_entry(event, &session->events, list) {
325 event->metadata_dumped = 0;
326 }
327
328 ret = _lttng_session_metadata_statedump(session);
329
330 end:
331 mutex_unlock(&sessions_mutex);
332 return ret;
333 }
334
335 int lttng_channel_enable(struct lttng_channel *channel)
336 {
337 int ret = 0;
338
339 mutex_lock(&sessions_mutex);
340 if (channel->channel_type == METADATA_CHANNEL) {
341 ret = -EPERM;
342 goto end;
343 }
344 if (channel->enabled) {
345 ret = -EEXIST;
346 goto end;
347 }
348 /* Set transient enabler state to "enabled" */
349 channel->tstate = 1;
350 lttng_session_sync_enablers(channel->session);
351 /* Set atomically the state to "enabled" */
352 WRITE_ONCE(channel->enabled, 1);
353 end:
354 mutex_unlock(&sessions_mutex);
355 return ret;
356 }
357
358 int lttng_channel_disable(struct lttng_channel *channel)
359 {
360 int ret = 0;
361
362 mutex_lock(&sessions_mutex);
363 if (channel->channel_type == METADATA_CHANNEL) {
364 ret = -EPERM;
365 goto end;
366 }
367 if (!channel->enabled) {
368 ret = -EEXIST;
369 goto end;
370 }
371 /* Set atomically the state to "disabled" */
372 WRITE_ONCE(channel->enabled, 0);
373 /* Set transient enabler state to "enabled" */
374 channel->tstate = 0;
375 lttng_session_sync_enablers(channel->session);
376 end:
377 mutex_unlock(&sessions_mutex);
378 return ret;
379 }
380
381 int lttng_event_enable(struct lttng_event *event)
382 {
383 int ret = 0;
384
385 mutex_lock(&sessions_mutex);
386 if (event->chan->channel_type == METADATA_CHANNEL) {
387 ret = -EPERM;
388 goto end;
389 }
390 if (event->enabled) {
391 ret = -EEXIST;
392 goto end;
393 }
394 switch (event->instrumentation) {
395 case LTTNG_KERNEL_TRACEPOINT:
396 case LTTNG_KERNEL_SYSCALL:
397 ret = -EINVAL;
398 break;
399 case LTTNG_KERNEL_KPROBE:
400 case LTTNG_KERNEL_UPROBE:
401 case LTTNG_KERNEL_NOOP:
402 WRITE_ONCE(event->enabled, 1);
403 break;
404 case LTTNG_KERNEL_KRETPROBE:
405 ret = lttng_kretprobes_event_enable_state(event, 1);
406 break;
407 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
408 default:
409 WARN_ON_ONCE(1);
410 ret = -EINVAL;
411 }
412 end:
413 mutex_unlock(&sessions_mutex);
414 return ret;
415 }
416
417 int lttng_event_disable(struct lttng_event *event)
418 {
419 int ret = 0;
420
421 mutex_lock(&sessions_mutex);
422 if (event->chan->channel_type == METADATA_CHANNEL) {
423 ret = -EPERM;
424 goto end;
425 }
426 if (!event->enabled) {
427 ret = -EEXIST;
428 goto end;
429 }
430 switch (event->instrumentation) {
431 case LTTNG_KERNEL_TRACEPOINT:
432 case LTTNG_KERNEL_SYSCALL:
433 ret = -EINVAL;
434 break;
435 case LTTNG_KERNEL_KPROBE:
436 case LTTNG_KERNEL_UPROBE:
437 case LTTNG_KERNEL_NOOP:
438 WRITE_ONCE(event->enabled, 0);
439 break;
440 case LTTNG_KERNEL_KRETPROBE:
441 ret = lttng_kretprobes_event_enable_state(event, 0);
442 break;
443 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
444 default:
445 WARN_ON_ONCE(1);
446 ret = -EINVAL;
447 }
448 end:
449 mutex_unlock(&sessions_mutex);
450 return ret;
451 }
452
453 static struct lttng_transport *lttng_transport_find(const char *name)
454 {
455 struct lttng_transport *transport;
456
457 list_for_each_entry(transport, &lttng_transport_list, node) {
458 if (!strcmp(transport->name, name))
459 return transport;
460 }
461 return NULL;
462 }
463
464 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
465 const char *transport_name,
466 void *buf_addr,
467 size_t subbuf_size, size_t num_subbuf,
468 unsigned int switch_timer_interval,
469 unsigned int read_timer_interval,
470 enum channel_type channel_type)
471 {
472 struct lttng_channel *chan;
473 struct lttng_transport *transport = NULL;
474
475 mutex_lock(&sessions_mutex);
476 if (session->been_active && channel_type != METADATA_CHANNEL)
477 goto active; /* Refuse to add channel to active session */
478 transport = lttng_transport_find(transport_name);
479 if (!transport) {
480 printk(KERN_WARNING "LTTng transport %s not found\n",
481 transport_name);
482 goto notransport;
483 }
484 if (!try_module_get(transport->owner)) {
485 printk(KERN_WARNING "LTT : Can't lock transport module.\n");
486 goto notransport;
487 }
488 chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL);
489 if (!chan)
490 goto nomem;
491 chan->session = session;
492 chan->id = session->free_chan_id++;
493 chan->ops = &transport->ops;
494 /*
495 * Note: the channel creation op already writes into the packet
496 * headers. Therefore the "chan" information used as input
497 * should be already accessible.
498 */
499 chan->chan = transport->ops.channel_create(transport_name,
500 chan, buf_addr, subbuf_size, num_subbuf,
501 switch_timer_interval, read_timer_interval);
502 if (!chan->chan)
503 goto create_error;
504 chan->tstate = 1;
505 chan->enabled = 1;
506 chan->transport = transport;
507 chan->channel_type = channel_type;
508 list_add(&chan->list, &session->chan);
509 mutex_unlock(&sessions_mutex);
510 return chan;
511
512 create_error:
513 kfree(chan);
514 nomem:
515 if (transport)
516 module_put(transport->owner);
517 notransport:
518 active:
519 mutex_unlock(&sessions_mutex);
520 return NULL;
521 }
522
523 /*
524 * Only used internally at session destruction for per-cpu channels, and
525 * when metadata channel is released.
526 * Needs to be called with sessions mutex held.
527 */
528 static
529 void _lttng_channel_destroy(struct lttng_channel *chan)
530 {
531 chan->ops->channel_destroy(chan->chan);
532 module_put(chan->transport->owner);
533 list_del(&chan->list);
534 lttng_destroy_context(chan->ctx);
535 kfree(chan);
536 }
537
538 void lttng_metadata_channel_destroy(struct lttng_channel *chan)
539 {
540 BUG_ON(chan->channel_type != METADATA_CHANNEL);
541
542 /* Protect the metadata cache with the sessions_mutex. */
543 mutex_lock(&sessions_mutex);
544 _lttng_channel_destroy(chan);
545 mutex_unlock(&sessions_mutex);
546 }
547 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
548
549 static
550 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
551 {
552 stream->finalized = 1;
553 wake_up_interruptible(&stream->read_wait);
554 }
555
556 /*
557 * Supports event creation while tracing session is active.
558 * Needs to be called with sessions mutex held.
559 */
560 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
561 struct lttng_kernel_event *event_param,
562 void *filter,
563 const struct lttng_event_desc *event_desc,
564 enum lttng_kernel_instrumentation itype)
565 {
566 struct lttng_session *session = chan->session;
567 struct lttng_event *event;
568 const char *event_name;
569 struct hlist_head *head;
570 size_t name_len;
571 uint32_t hash;
572 int ret;
573
574 if (chan->free_event_id == -1U) {
575 ret = -EMFILE;
576 goto full;
577 }
578
579 switch (itype) {
580 case LTTNG_KERNEL_TRACEPOINT:
581 event_name = event_desc->name;
582 break;
583 case LTTNG_KERNEL_KPROBE:
584 case LTTNG_KERNEL_UPROBE:
585 case LTTNG_KERNEL_KRETPROBE:
586 case LTTNG_KERNEL_NOOP:
587 case LTTNG_KERNEL_SYSCALL:
588 event_name = event_param->name;
589 break;
590 case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
591 default:
592 WARN_ON_ONCE(1);
593 ret = -EINVAL;
594 goto type_error;
595 }
596 name_len = strlen(event_name);
597 hash = jhash(event_name, name_len, 0);
598 head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)];
599 hlist_for_each_entry(event, head, hlist) {
600 WARN_ON_ONCE(!event->desc);
601 if (!strncmp(event->desc->name, event_name,
602 LTTNG_KERNEL_SYM_NAME_LEN - 1)
603 && chan == event->chan) {
604 ret = -EEXIST;
605 goto exist;
606 }
607 }
608
609 event = kmem_cache_zalloc(event_cache, GFP_KERNEL);
610 if (!event) {
611 ret = -ENOMEM;
612 goto cache_error;
613 }
614 event->chan = chan;
615 event->filter = filter;
616 event->id = chan->free_event_id++;
617 event->instrumentation = itype;
618 event->evtype = LTTNG_TYPE_EVENT;
619 INIT_LIST_HEAD(&event->bytecode_runtime_head);
620 INIT_LIST_HEAD(&event->enablers_ref_head);
621
622 switch (itype) {
623 case LTTNG_KERNEL_TRACEPOINT:
624 /* Event will be enabled by enabler sync. */
625 event->enabled = 0;
626 event->registered = 0;
627 event->desc = lttng_event_get(event_name);
628 if (!event->desc) {
629 ret = -ENOENT;
630 goto register_error;
631 }
632 /* Populate lttng_event structure before event registration. */
633 smp_wmb();
634 break;
635 case LTTNG_KERNEL_KPROBE:
636 /*
637 * Needs to be explicitly enabled after creation, since
638 * we may want to apply filters.
639 */
640 event->enabled = 0;
641 event->registered = 1;
642 /*
643 * Populate lttng_event structure before event
644 * registration.
645 */
646 smp_wmb();
647 ret = lttng_kprobes_register(event_name,
648 event_param->u.kprobe.symbol_name,
649 event_param->u.kprobe.offset,
650 event_param->u.kprobe.addr,
651 event);
652 if (ret) {
653 ret = -EINVAL;
654 goto register_error;
655 }
656 ret = try_module_get(event->desc->owner);
657 WARN_ON_ONCE(!ret);
658 break;
659 case LTTNG_KERNEL_KRETPROBE:
660 {
661 struct lttng_event *event_return;
662
663 /* kretprobe defines 2 events */
664 /*
665 * Needs to be explicitly enabled after creation, since
666 * we may want to apply filters.
667 */
668 event->enabled = 0;
669 event->registered = 1;
670 event_return =
671 kmem_cache_zalloc(event_cache, GFP_KERNEL);
672 if (!event_return) {
673 ret = -ENOMEM;
674 goto register_error;
675 }
676 event_return->chan = chan;
677 event_return->filter = filter;
678 event_return->id = chan->free_event_id++;
679 event_return->enabled = 0;
680 event_return->registered = 1;
681 event_return->instrumentation = itype;
682 /*
683 * Populate lttng_event structure before kretprobe registration.
684 */
685 smp_wmb();
686 ret = lttng_kretprobes_register(event_name,
687 event_param->u.kretprobe.symbol_name,
688 event_param->u.kretprobe.offset,
689 event_param->u.kretprobe.addr,
690 event, event_return);
691 if (ret) {
692 kmem_cache_free(event_cache, event_return);
693 ret = -EINVAL;
694 goto register_error;
695 }
696 /* Take 2 refs on the module: one per event. */
697 ret = try_module_get(event->desc->owner);
698 WARN_ON_ONCE(!ret);
699 ret = try_module_get(event->desc->owner);
700 WARN_ON_ONCE(!ret);
701 ret = _lttng_event_metadata_statedump(chan->session, chan,
702 event_return);
703 WARN_ON_ONCE(ret > 0);
704 if (ret) {
705 kmem_cache_free(event_cache, event_return);
706 module_put(event->desc->owner);
707 module_put(event->desc->owner);
708 goto statedump_error;
709 }
710 list_add(&event_return->list, &chan->session->events);
711 break;
712 }
713 case LTTNG_KERNEL_NOOP:
714 case LTTNG_KERNEL_SYSCALL:
715 /*
716 * Needs to be explicitly enabled after creation, since
717 * we may want to apply filters.
718 */
719 event->enabled = 0;
720 event->registered = 0;
721 event->desc = event_desc;
722 if (!event->desc) {
723 ret = -EINVAL;
724 goto register_error;
725 }
726 break;
727 case LTTNG_KERNEL_UPROBE:
728 /*
729 * Needs to be explicitly enabled after creation, since
730 * we may want to apply filters.
731 */
732 event->enabled = 0;
733 event->registered = 1;
734
735 /*
736 * Populate lttng_event structure before event
737 * registration.
738 */
739 smp_wmb();
740
741 ret = lttng_uprobes_register(event_param->name,
742 event_param->u.uprobe.fd,
743 event);
744 if (ret)
745 goto register_error;
746 ret = try_module_get(event->desc->owner);
747 WARN_ON_ONCE(!ret);
748 break;
749 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
750 default:
751 WARN_ON_ONCE(1);
752 ret = -EINVAL;
753 goto register_error;
754 }
755 ret = _lttng_event_metadata_statedump(chan->session, chan, event);
756 WARN_ON_ONCE(ret > 0);
757 if (ret) {
758 goto statedump_error;
759 }
760 hlist_add_head(&event->hlist, head);
761 list_add(&event->list, &chan->session->events);
762 return event;
763
764 statedump_error:
765 /* If a statedump error occurs, events will not be readable. */
766 register_error:
767 kmem_cache_free(event_cache, event);
768 cache_error:
769 exist:
770 type_error:
771 full:
772 return ERR_PTR(ret);
773 }
774
775 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
776 struct lttng_kernel_event *event_param,
777 void *filter,
778 const struct lttng_event_desc *event_desc,
779 enum lttng_kernel_instrumentation itype)
780 {
781 struct lttng_event *event;
782
783 mutex_lock(&sessions_mutex);
784 event = _lttng_event_create(chan, event_param, filter, event_desc,
785 itype);
786 mutex_unlock(&sessions_mutex);
787 return event;
788 }
789
790 /* Only used for tracepoints for now. */
791 static
792 void register_event(struct lttng_event *event)
793 {
794 const struct lttng_event_desc *desc;
795 int ret = -EINVAL;
796
797 if (event->registered)
798 return;
799
800 desc = event->desc;
801 switch (event->instrumentation) {
802 case LTTNG_KERNEL_TRACEPOINT:
803 ret = lttng_tracepoint_probe_register(desc->kname,
804 desc->probe_callback,
805 event);
806 break;
807 case LTTNG_KERNEL_SYSCALL:
808 ret = lttng_syscall_filter_enable(event->chan,
809 desc->name);
810 break;
811 case LTTNG_KERNEL_KPROBE:
812 case LTTNG_KERNEL_UPROBE:
813 case LTTNG_KERNEL_KRETPROBE:
814 case LTTNG_KERNEL_NOOP:
815 ret = 0;
816 break;
817 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
818 default:
819 WARN_ON_ONCE(1);
820 }
821 if (!ret)
822 event->registered = 1;
823 }
824
825 /*
826 * Only used internally at session destruction.
827 */
828 int _lttng_event_unregister(struct lttng_event *event)
829 {
830 const struct lttng_event_desc *desc;
831 int ret = -EINVAL;
832
833 if (!event->registered)
834 return 0;
835
836 desc = event->desc;
837 switch (event->instrumentation) {
838 case LTTNG_KERNEL_TRACEPOINT:
839 ret = lttng_tracepoint_probe_unregister(event->desc->kname,
840 event->desc->probe_callback,
841 event);
842 break;
843 case LTTNG_KERNEL_KPROBE:
844 lttng_kprobes_unregister(event);
845 ret = 0;
846 break;
847 case LTTNG_KERNEL_KRETPROBE:
848 lttng_kretprobes_unregister(event);
849 ret = 0;
850 break;
851 case LTTNG_KERNEL_SYSCALL:
852 ret = lttng_syscall_filter_disable(event->chan,
853 desc->name);
854 break;
855 case LTTNG_KERNEL_NOOP:
856 ret = 0;
857 break;
858 case LTTNG_KERNEL_UPROBE:
859 lttng_uprobes_unregister(event);
860 ret = 0;
861 break;
862 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
863 default:
864 WARN_ON_ONCE(1);
865 }
866 if (!ret)
867 event->registered = 0;
868 return ret;
869 }
870
871 /*
872 * Only used internally at session destruction.
873 */
874 static
875 void _lttng_event_destroy(struct lttng_event *event)
876 {
877 switch (event->instrumentation) {
878 case LTTNG_KERNEL_TRACEPOINT:
879 lttng_event_put(event->desc);
880 break;
881 case LTTNG_KERNEL_KPROBE:
882 module_put(event->desc->owner);
883 lttng_kprobes_destroy_private(event);
884 break;
885 case LTTNG_KERNEL_KRETPROBE:
886 module_put(event->desc->owner);
887 lttng_kretprobes_destroy_private(event);
888 break;
889 case LTTNG_KERNEL_NOOP:
890 case LTTNG_KERNEL_SYSCALL:
891 break;
892 case LTTNG_KERNEL_UPROBE:
893 module_put(event->desc->owner);
894 lttng_uprobes_destroy_private(event);
895 break;
896 case LTTNG_KERNEL_FUNCTION: /* Fall-through */
897 default:
898 WARN_ON_ONCE(1);
899 }
900 list_del(&event->list);
901 lttng_destroy_context(event->ctx);
902 kmem_cache_free(event_cache, event);
903 }
904
905 struct lttng_id_tracker *get_tracker(struct lttng_session *session,
906 enum tracker_type tracker_type)
907 {
908 switch (tracker_type) {
909 case TRACKER_PID:
910 return &session->pid_tracker;
911 case TRACKER_VPID:
912 return &session->vpid_tracker;
913 case TRACKER_UID:
914 return &session->uid_tracker;
915 case TRACKER_VUID:
916 return &session->vuid_tracker;
917 case TRACKER_GID:
918 return &session->gid_tracker;
919 case TRACKER_VGID:
920 return &session->vgid_tracker;
921 default:
922 WARN_ON_ONCE(1);
923 return NULL;
924 }
925 }
926
927 int lttng_session_track_id(struct lttng_session *session,
928 enum tracker_type tracker_type, int id)
929 {
930 struct lttng_id_tracker *tracker;
931 int ret;
932
933 tracker = get_tracker(session, tracker_type);
934 if (!tracker)
935 return -EINVAL;
936 if (id < -1)
937 return -EINVAL;
938 mutex_lock(&sessions_mutex);
939 if (id == -1) {
940 /* track all ids: destroy tracker. */
941 lttng_id_tracker_destroy(tracker, true);
942 ret = 0;
943 } else {
944 ret = lttng_id_tracker_add(tracker, id);
945 }
946 mutex_unlock(&sessions_mutex);
947 return ret;
948 }
949
950 int lttng_session_untrack_id(struct lttng_session *session,
951 enum tracker_type tracker_type, int id)
952 {
953 struct lttng_id_tracker *tracker;
954 int ret;
955
956 tracker = get_tracker(session, tracker_type);
957 if (!tracker)
958 return -EINVAL;
959 if (id < -1)
960 return -EINVAL;
961 mutex_lock(&sessions_mutex);
962 if (id == -1) {
963 /* untrack all ids: replace by empty tracker. */
964 ret = lttng_id_tracker_empty_set(tracker);
965 } else {
966 ret = lttng_id_tracker_del(tracker, id);
967 }
968 mutex_unlock(&sessions_mutex);
969 return ret;
970 }
971
972 static
973 void *id_list_start(struct seq_file *m, loff_t *pos)
974 {
975 struct lttng_id_tracker *id_tracker = m->private;
976 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
977 struct lttng_id_hash_node *e;
978 int iter = 0, i;
979
980 mutex_lock(&sessions_mutex);
981 if (id_tracker_p) {
982 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
983 struct hlist_head *head = &id_tracker_p->id_hash[i];
984
985 hlist_for_each_entry(e, head, hlist) {
986 if (iter++ >= *pos)
987 return e;
988 }
989 }
990 } else {
991 /* ID tracker disabled. */
992 if (iter >= *pos && iter == 0) {
993 return id_tracker_p; /* empty tracker */
994 }
995 iter++;
996 }
997 /* End of list */
998 return NULL;
999 }
1000
1001 /* Called with sessions_mutex held. */
1002 static
1003 void *id_list_next(struct seq_file *m, void *p, loff_t *ppos)
1004 {
1005 struct lttng_id_tracker *id_tracker = m->private;
1006 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1007 struct lttng_id_hash_node *e;
1008 int iter = 0, i;
1009
1010 (*ppos)++;
1011 if (id_tracker_p) {
1012 for (i = 0; i < LTTNG_ID_TABLE_SIZE; i++) {
1013 struct hlist_head *head = &id_tracker_p->id_hash[i];
1014
1015 hlist_for_each_entry(e, head, hlist) {
1016 if (iter++ >= *ppos)
1017 return e;
1018 }
1019 }
1020 } else {
1021 /* ID tracker disabled. */
1022 if (iter >= *ppos && iter == 0)
1023 return p; /* empty tracker */
1024 iter++;
1025 }
1026
1027 /* End of list */
1028 return NULL;
1029 }
1030
1031 static
1032 void id_list_stop(struct seq_file *m, void *p)
1033 {
1034 mutex_unlock(&sessions_mutex);
1035 }
1036
1037 static
1038 int id_list_show(struct seq_file *m, void *p)
1039 {
1040 struct lttng_id_tracker *id_tracker = m->private;
1041 struct lttng_id_tracker_rcu *id_tracker_p = id_tracker->p;
1042 int id;
1043
1044 if (p == id_tracker_p) {
1045 /* Tracker disabled. */
1046 id = -1;
1047 } else {
1048 const struct lttng_id_hash_node *e = p;
1049
1050 id = lttng_id_tracker_get_node_id(e);
1051 }
1052 switch (id_tracker->tracker_type) {
1053 case TRACKER_PID:
1054 seq_printf(m, "process { pid = %d; };\n", id);
1055 break;
1056 case TRACKER_VPID:
1057 seq_printf(m, "process { vpid = %d; };\n", id);
1058 break;
1059 case TRACKER_UID:
1060 seq_printf(m, "user { uid = %d; };\n", id);
1061 break;
1062 case TRACKER_VUID:
1063 seq_printf(m, "user { vuid = %d; };\n", id);
1064 break;
1065 case TRACKER_GID:
1066 seq_printf(m, "group { gid = %d; };\n", id);
1067 break;
1068 case TRACKER_VGID:
1069 seq_printf(m, "group { vgid = %d; };\n", id);
1070 break;
1071 default:
1072 seq_printf(m, "UNKNOWN { field = %d };\n", id);
1073 }
1074 return 0;
1075 }
1076
1077 static
1078 const struct seq_operations lttng_tracker_ids_list_seq_ops = {
1079 .start = id_list_start,
1080 .next = id_list_next,
1081 .stop = id_list_stop,
1082 .show = id_list_show,
1083 };
1084
1085 static
1086 int lttng_tracker_ids_list_open(struct inode *inode, struct file *file)
1087 {
1088 return seq_open(file, &lttng_tracker_ids_list_seq_ops);
1089 }
1090
1091 static
1092 int lttng_tracker_ids_list_release(struct inode *inode, struct file *file)
1093 {
1094 struct seq_file *m = file->private_data;
1095 struct lttng_id_tracker *id_tracker = m->private;
1096 int ret;
1097
1098 WARN_ON_ONCE(!id_tracker);
1099 ret = seq_release(inode, file);
1100 if (!ret)
1101 fput(id_tracker->session->file);
1102 return ret;
1103 }
1104
1105 const struct file_operations lttng_tracker_ids_list_fops = {
1106 .owner = THIS_MODULE,
1107 .open = lttng_tracker_ids_list_open,
1108 .read = seq_read,
1109 .llseek = seq_lseek,
1110 .release = lttng_tracker_ids_list_release,
1111 };
1112
1113 int lttng_session_list_tracker_ids(struct lttng_session *session,
1114 enum tracker_type tracker_type)
1115 {
1116 struct file *tracker_ids_list_file;
1117 struct seq_file *m;
1118 int file_fd, ret;
1119
1120 file_fd = get_unused_fd_flags(0);
1121 if (file_fd < 0) {
1122 ret = file_fd;
1123 goto fd_error;
1124 }
1125
1126 tracker_ids_list_file = anon_inode_getfile("[lttng_tracker_ids_list]",
1127 &lttng_tracker_ids_list_fops,
1128 NULL, O_RDWR);
1129 if (IS_ERR(tracker_ids_list_file)) {
1130 ret = PTR_ERR(tracker_ids_list_file);
1131 goto file_error;
1132 }
1133 if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) {
1134 ret = -EOVERFLOW;
1135 goto refcount_error;
1136 }
1137 ret = lttng_tracker_ids_list_fops.open(NULL, tracker_ids_list_file);
1138 if (ret < 0)
1139 goto open_error;
1140 m = tracker_ids_list_file->private_data;
1141
1142 m->private = get_tracker(session, tracker_type);
1143 BUG_ON(!m->private);
1144 fd_install(file_fd, tracker_ids_list_file);
1145
1146 return file_fd;
1147
1148 open_error:
1149 atomic_long_dec(&session->file->f_count);
1150 refcount_error:
1151 fput(tracker_ids_list_file);
1152 file_error:
1153 put_unused_fd(file_fd);
1154 fd_error:
1155 return ret;
1156 }
1157
1158 /*
1159 * Enabler management.
1160 */
1161 static
1162 int lttng_match_enabler_star_glob(const char *desc_name,
1163 const char *pattern)
1164 {
1165 if (!strutils_star_glob_match(pattern, SIZE_MAX,
1166 desc_name, SIZE_MAX))
1167 return 0;
1168 return 1;
1169 }
1170
1171 static
1172 int lttng_match_enabler_name(const char *desc_name,
1173 const char *name)
1174 {
1175 if (strcmp(desc_name, name))
1176 return 0;
1177 return 1;
1178 }
1179
1180 static
1181 int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
1182 struct lttng_enabler *enabler)
1183 {
1184 const char *desc_name, *enabler_name;
1185
1186 enabler_name = enabler->event_param.name;
1187 switch (enabler->event_param.instrumentation) {
1188 case LTTNG_KERNEL_TRACEPOINT:
1189 desc_name = desc->name;
1190 break;
1191 case LTTNG_KERNEL_SYSCALL:
1192 desc_name = desc->name;
1193 if (!strncmp(desc_name, "compat_", strlen("compat_")))
1194 desc_name += strlen("compat_");
1195 if (!strncmp(desc_name, "syscall_exit_",
1196 strlen("syscall_exit_"))) {
1197 desc_name += strlen("syscall_exit_");
1198 } else if (!strncmp(desc_name, "syscall_entry_",
1199 strlen("syscall_entry_"))) {
1200 desc_name += strlen("syscall_entry_");
1201 } else {
1202 WARN_ON_ONCE(1);
1203 return -EINVAL;
1204 }
1205 break;
1206 default:
1207 WARN_ON_ONCE(1);
1208 return -EINVAL;
1209 }
1210 switch (enabler->type) {
1211 case LTTNG_ENABLER_STAR_GLOB:
1212 return lttng_match_enabler_star_glob(desc_name, enabler_name);
1213 case LTTNG_ENABLER_NAME:
1214 return lttng_match_enabler_name(desc_name, enabler_name);
1215 default:
1216 return -EINVAL;
1217 }
1218 }
1219
1220 static
1221 int lttng_event_match_enabler(struct lttng_event *event,
1222 struct lttng_enabler *enabler)
1223 {
1224 if (enabler->event_param.instrumentation != event->instrumentation)
1225 return 0;
1226 if (lttng_desc_match_enabler(event->desc, enabler)
1227 && event->chan == enabler->chan)
1228 return 1;
1229 else
1230 return 0;
1231 }
1232
1233 static
1234 struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event,
1235 struct lttng_enabler *enabler)
1236 {
1237 struct lttng_enabler_ref *enabler_ref;
1238
1239 list_for_each_entry(enabler_ref,
1240 &event->enablers_ref_head, node) {
1241 if (enabler_ref->ref == enabler)
1242 return enabler_ref;
1243 }
1244 return NULL;
1245 }
1246
1247 static
1248 void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler)
1249 {
1250 struct lttng_session *session = enabler->chan->session;
1251 struct lttng_probe_desc *probe_desc;
1252 const struct lttng_event_desc *desc;
1253 int i;
1254 struct list_head *probe_list;
1255
1256 probe_list = lttng_get_probe_list_head();
1257 /*
1258 * For each probe event, if we find that a probe event matches
1259 * our enabler, create an associated lttng_event if not
1260 * already present.
1261 */
1262 list_for_each_entry(probe_desc, probe_list, head) {
1263 for (i = 0; i < probe_desc->nr_events; i++) {
1264 int found = 0;
1265 struct hlist_head *head;
1266 const char *event_name;
1267 size_t name_len;
1268 uint32_t hash;
1269 struct lttng_event *event;
1270
1271 desc = probe_desc->event_desc[i];
1272 if (!lttng_desc_match_enabler(desc, enabler))
1273 continue;
1274 event_name = desc->name;
1275 name_len = strlen(event_name);
1276
1277 /*
1278 * Check if already created.
1279 */
1280 hash = jhash(event_name, name_len, 0);
1281 head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)];
1282 hlist_for_each_entry(event, head, hlist) {
1283 if (event->desc == desc
1284 && event->chan == enabler->chan)
1285 found = 1;
1286 }
1287 if (found)
1288 continue;
1289
1290 /*
1291 * We need to create an event for this
1292 * event probe.
1293 */
1294 event = _lttng_event_create(enabler->chan,
1295 NULL, NULL, desc,
1296 LTTNG_KERNEL_TRACEPOINT);
1297 if (!event) {
1298 printk(KERN_INFO "Unable to create event %s\n",
1299 probe_desc->event_desc[i]->name);
1300 }
1301 }
1302 }
1303 }
1304
1305 static
1306 void lttng_create_syscall_if_missing(struct lttng_enabler *enabler)
1307 {
1308 int ret;
1309
1310 ret = lttng_syscalls_register(enabler->chan, NULL);
1311 WARN_ON_ONCE(ret);
1312 }
1313
1314 /*
1315 * Create struct lttng_event if it is missing and present in the list of
1316 * tracepoint probes.
1317 * Should be called with sessions mutex held.
1318 */
1319 static
1320 void lttng_create_event_if_missing(struct lttng_enabler *enabler)
1321 {
1322 switch (enabler->event_param.instrumentation) {
1323 case LTTNG_KERNEL_TRACEPOINT:
1324 lttng_create_tracepoint_if_missing(enabler);
1325 break;
1326 case LTTNG_KERNEL_SYSCALL:
1327 lttng_create_syscall_if_missing(enabler);
1328 break;
1329 default:
1330 WARN_ON_ONCE(1);
1331 break;
1332 }
1333 }
1334
1335 /*
1336 * Create events associated with an enabler (if not already present),
1337 * and add backward reference from the event to the enabler.
1338 * Should be called with sessions mutex held.
1339 */
1340 static
1341 int lttng_enabler_ref_events(struct lttng_enabler *enabler)
1342 {
1343 struct lttng_session *session = enabler->chan->session;
1344 struct lttng_event *event;
1345
1346 /* First ensure that probe events are created for this enabler. */
1347 lttng_create_event_if_missing(enabler);
1348
1349 /* For each event matching enabler in session event list. */
1350 list_for_each_entry(event, &session->events, list) {
1351 struct lttng_enabler_ref *enabler_ref;
1352
1353 if (!lttng_event_match_enabler(event, enabler))
1354 continue;
1355 enabler_ref = lttng_event_enabler_ref(event, enabler);
1356 if (!enabler_ref) {
1357 /*
1358 * If no backward ref, create it.
1359 * Add backward ref from event to enabler.
1360 */
1361 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
1362 if (!enabler_ref)
1363 return -ENOMEM;
1364 enabler_ref->ref = enabler;
1365 list_add(&enabler_ref->node,
1366 &event->enablers_ref_head);
1367 }
1368
1369 /*
1370 * Link filter bytecodes if not linked yet.
1371 */
1372 lttng_enabler_event_link_bytecode(event, enabler);
1373
1374 /* TODO: merge event context. */
1375 }
1376 return 0;
1377 }
1378
1379 /*
1380 * Called at module load: connect the probe on all enablers matching
1381 * this event.
1382 * Called with sessions lock held.
1383 */
1384 int lttng_fix_pending_events(void)
1385 {
1386 struct lttng_session *session;
1387
1388 list_for_each_entry(session, &sessions, list)
1389 lttng_session_lazy_sync_enablers(session);
1390 return 0;
1391 }
1392
1393 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
1394 struct lttng_kernel_event *event_param,
1395 struct lttng_channel *chan)
1396 {
1397 struct lttng_enabler *enabler;
1398
1399 enabler = kzalloc(sizeof(*enabler), GFP_KERNEL);
1400 if (!enabler)
1401 return NULL;
1402 enabler->type = type;
1403 INIT_LIST_HEAD(&enabler->filter_bytecode_head);
1404 memcpy(&enabler->event_param, event_param,
1405 sizeof(enabler->event_param));
1406 enabler->chan = chan;
1407 /* ctx left NULL */
1408 enabler->enabled = 0;
1409 enabler->evtype = LTTNG_TYPE_ENABLER;
1410 mutex_lock(&sessions_mutex);
1411 list_add(&enabler->node, &enabler->chan->session->enablers_head);
1412 lttng_session_lazy_sync_enablers(enabler->chan->session);
1413 mutex_unlock(&sessions_mutex);
1414 return enabler;
1415 }
1416
1417 int lttng_enabler_enable(struct lttng_enabler *enabler)
1418 {
1419 mutex_lock(&sessions_mutex);
1420 enabler->enabled = 1;
1421 lttng_session_lazy_sync_enablers(enabler->chan->session);
1422 mutex_unlock(&sessions_mutex);
1423 return 0;
1424 }
1425
1426 int lttng_enabler_disable(struct lttng_enabler *enabler)
1427 {
1428 mutex_lock(&sessions_mutex);
1429 enabler->enabled = 0;
1430 lttng_session_lazy_sync_enablers(enabler->chan->session);
1431 mutex_unlock(&sessions_mutex);
1432 return 0;
1433 }
1434
1435 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
1436 struct lttng_kernel_filter_bytecode __user *bytecode)
1437 {
1438 struct lttng_filter_bytecode_node *bytecode_node;
1439 uint32_t bytecode_len;
1440 int ret;
1441
1442 ret = get_user(bytecode_len, &bytecode->len);
1443 if (ret)
1444 return ret;
1445 bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len,
1446 GFP_KERNEL);
1447 if (!bytecode_node)
1448 return -ENOMEM;
1449 ret = copy_from_user(&bytecode_node->bc, bytecode,
1450 sizeof(*bytecode) + bytecode_len);
1451 if (ret)
1452 goto error_free;
1453 bytecode_node->enabler = enabler;
1454 /* Enforce length based on allocated size */
1455 bytecode_node->bc.len = bytecode_len;
1456 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
1457 lttng_session_lazy_sync_enablers(enabler->chan->session);
1458 return 0;
1459
1460 error_free:
1461 kfree(bytecode_node);
1462 return ret;
1463 }
1464
1465 int lttng_event_add_callsite(struct lttng_event *event,
1466 struct lttng_kernel_event_callsite __user *callsite)
1467 {
1468
1469 switch (event->instrumentation) {
1470 case LTTNG_KERNEL_UPROBE:
1471 return lttng_uprobes_add_callsite(event, callsite);
1472 default:
1473 return -EINVAL;
1474 }
1475 }
1476
1477 int lttng_enabler_attach_context(struct lttng_enabler *enabler,
1478 struct lttng_kernel_context *context_param)
1479 {
1480 return -ENOSYS;
1481 }
1482
1483 static
1484 void lttng_enabler_destroy(struct lttng_enabler *enabler)
1485 {
1486 struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node;
1487
1488 /* Destroy filter bytecode */
1489 list_for_each_entry_safe(filter_node, tmp_filter_node,
1490 &enabler->filter_bytecode_head, node) {
1491 kfree(filter_node);
1492 }
1493
1494 /* Destroy contexts */
1495 lttng_destroy_context(enabler->ctx);
1496
1497 list_del(&enabler->node);
1498 kfree(enabler);
1499 }
1500
1501 /*
1502 * lttng_session_sync_enablers should be called just before starting a
1503 * session.
1504 * Should be called with sessions mutex held.
1505 */
1506 static
1507 void lttng_session_sync_enablers(struct lttng_session *session)
1508 {
1509 struct lttng_enabler *enabler;
1510 struct lttng_event *event;
1511
1512 list_for_each_entry(enabler, &session->enablers_head, node)
1513 lttng_enabler_ref_events(enabler);
1514 /*
1515 * For each event, if at least one of its enablers is enabled,
1516 * and its channel and session transient states are enabled, we
1517 * enable the event, else we disable it.
1518 */
1519 list_for_each_entry(event, &session->events, list) {
1520 struct lttng_enabler_ref *enabler_ref;
1521 struct lttng_bytecode_runtime *runtime;
1522 int enabled = 0, has_enablers_without_bytecode = 0;
1523
1524 switch (event->instrumentation) {
1525 case LTTNG_KERNEL_TRACEPOINT:
1526 case LTTNG_KERNEL_SYSCALL:
1527 /* Enable events */
1528 list_for_each_entry(enabler_ref,
1529 &event->enablers_ref_head, node) {
1530 if (enabler_ref->ref->enabled) {
1531 enabled = 1;
1532 break;
1533 }
1534 }
1535 break;
1536 default:
1537 /* Not handled with lazy sync. */
1538 continue;
1539 }
1540 /*
1541 * Enabled state is based on union of enablers, with
1542 * intesection of session and channel transient enable
1543 * states.
1544 */
1545 enabled = enabled && session->tstate && event->chan->tstate;
1546
1547 WRITE_ONCE(event->enabled, enabled);
1548 /*
1549 * Sync tracepoint registration with event enabled
1550 * state.
1551 */
1552 if (enabled) {
1553 register_event(event);
1554 } else {
1555 _lttng_event_unregister(event);
1556 }
1557
1558 /* Check if has enablers without bytecode enabled */
1559 list_for_each_entry(enabler_ref,
1560 &event->enablers_ref_head, node) {
1561 if (enabler_ref->ref->enabled
1562 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
1563 has_enablers_without_bytecode = 1;
1564 break;
1565 }
1566 }
1567 event->has_enablers_without_bytecode =
1568 has_enablers_without_bytecode;
1569
1570 /* Enable filters */
1571 list_for_each_entry(runtime,
1572 &event->bytecode_runtime_head, node)
1573 lttng_filter_sync_state(runtime);
1574 }
1575 }
1576
1577 /*
1578 * Apply enablers to session events, adding events to session if need
1579 * be. It is required after each modification applied to an active
1580 * session, and right before session "start".
1581 * "lazy" sync means we only sync if required.
1582 * Should be called with sessions mutex held.
1583 */
1584 static
1585 void lttng_session_lazy_sync_enablers(struct lttng_session *session)
1586 {
1587 /* We can skip if session is not active */
1588 if (!session->active)
1589 return;
1590 lttng_session_sync_enablers(session);
1591 }
1592
1593 /*
1594 * Serialize at most one packet worth of metadata into a metadata
1595 * channel.
1596 * We grab the metadata cache mutex to get exclusive access to our metadata
1597 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1598 * allows us to do racy operations such as looking for remaining space left in
1599 * packet and write, since mutual exclusion protects us from concurrent writes.
1600 * Mutual exclusion on the metadata cache allow us to read the cache content
1601 * without racing against reallocation of the cache by updates.
1602 * Returns the number of bytes written in the channel, 0 if no data
1603 * was written and a negative value on error.
1604 */
1605 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
1606 struct channel *chan)
1607 {
1608 struct lib_ring_buffer_ctx ctx;
1609 int ret = 0;
1610 size_t len, reserve_len;
1611
1612 /*
1613 * Ensure we support mutiple get_next / put sequences followed by
1614 * put_next. The metadata cache lock protects reading the metadata
1615 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1616 * "flush" operations on the buffer invoked by different processes.
1617 * Moreover, since the metadata cache memory can be reallocated, we
1618 * need to have exclusive access against updates even though we only
1619 * read it.
1620 */
1621 mutex_lock(&stream->metadata_cache->lock);
1622 WARN_ON(stream->metadata_in < stream->metadata_out);
1623 if (stream->metadata_in != stream->metadata_out)
1624 goto end;
1625
1626 /* Metadata regenerated, change the version. */
1627 if (stream->metadata_cache->version != stream->version)
1628 stream->version = stream->metadata_cache->version;
1629
1630 len = stream->metadata_cache->metadata_written -
1631 stream->metadata_in;
1632 if (!len)
1633 goto end;
1634 reserve_len = min_t(size_t,
1635 stream->transport->ops.packet_avail_size(chan),
1636 len);
1637 lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len,
1638 sizeof(char), -1);
1639 /*
1640 * If reservation failed, return an error to the caller.
1641 */
1642 ret = stream->transport->ops.event_reserve(&ctx, 0);
1643 if (ret != 0) {
1644 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
1645 goto end;
1646 }
1647 stream->transport->ops.event_write(&ctx,
1648 stream->metadata_cache->data + stream->metadata_in,
1649 reserve_len);
1650 stream->transport->ops.event_commit(&ctx);
1651 stream->metadata_in += reserve_len;
1652 ret = reserve_len;
1653
1654 end:
1655 mutex_unlock(&stream->metadata_cache->lock);
1656 return ret;
1657 }
1658
1659 /*
1660 * Write the metadata to the metadata cache.
1661 * Must be called with sessions_mutex held.
1662 * The metadata cache lock protects us from concurrent read access from
1663 * thread outputting metadata content to ring buffer.
1664 */
1665 int lttng_metadata_printf(struct lttng_session *session,
1666 const char *fmt, ...)
1667 {
1668 char *str;
1669 size_t len;
1670 va_list ap;
1671 struct lttng_metadata_stream *stream;
1672
1673 WARN_ON_ONCE(!READ_ONCE(session->active));
1674
1675 va_start(ap, fmt);
1676 str = kvasprintf(GFP_KERNEL, fmt, ap);
1677 va_end(ap);
1678 if (!str)
1679 return -ENOMEM;
1680
1681 len = strlen(str);
1682 mutex_lock(&session->metadata_cache->lock);
1683 if (session->metadata_cache->metadata_written + len >
1684 session->metadata_cache->cache_alloc) {
1685 char *tmp_cache_realloc;
1686 unsigned int tmp_cache_alloc_size;
1687
1688 tmp_cache_alloc_size = max_t(unsigned int,
1689 session->metadata_cache->cache_alloc + len,
1690 session->metadata_cache->cache_alloc << 1);
1691 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
1692 if (!tmp_cache_realloc)
1693 goto err;
1694 if (session->metadata_cache->data) {
1695 memcpy(tmp_cache_realloc,
1696 session->metadata_cache->data,
1697 session->metadata_cache->cache_alloc);
1698 vfree(session->metadata_cache->data);
1699 }
1700
1701 session->metadata_cache->cache_alloc = tmp_cache_alloc_size;
1702 session->metadata_cache->data = tmp_cache_realloc;
1703 }
1704 memcpy(session->metadata_cache->data +
1705 session->metadata_cache->metadata_written,
1706 str, len);
1707 session->metadata_cache->metadata_written += len;
1708 mutex_unlock(&session->metadata_cache->lock);
1709 kfree(str);
1710
1711 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list)
1712 wake_up_interruptible(&stream->read_wait);
1713
1714 return 0;
1715
1716 err:
1717 mutex_unlock(&session->metadata_cache->lock);
1718 kfree(str);
1719 return -ENOMEM;
1720 }
1721
1722 static
1723 int print_tabs(struct lttng_session *session, size_t nesting)
1724 {
1725 size_t i;
1726
1727 for (i = 0; i < nesting; i++) {
1728 int ret;
1729
1730 ret = lttng_metadata_printf(session, " ");
1731 if (ret) {
1732 return ret;
1733 }
1734 }
1735 return 0;
1736 }
1737
1738 static
1739 int lttng_field_name_statedump(struct lttng_session *session,
1740 const struct lttng_event_field *field,
1741 size_t nesting)
1742 {
1743 return lttng_metadata_printf(session, " _%s;\n", field->name);
1744 }
1745
1746 static
1747 int _lttng_integer_type_statedump(struct lttng_session *session,
1748 const struct lttng_type *type,
1749 size_t nesting)
1750 {
1751 int ret;
1752
1753 WARN_ON_ONCE(type->atype != atype_integer);
1754 ret = print_tabs(session, nesting);
1755 if (ret)
1756 return ret;
1757 ret = lttng_metadata_printf(session,
1758 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s }",
1759 type->u.integer.size,
1760 type->u.integer.alignment,
1761 type->u.integer.signedness,
1762 (type->u.integer.encoding == lttng_encode_none)
1763 ? "none"
1764 : (type->u.integer.encoding == lttng_encode_UTF8)
1765 ? "UTF8"
1766 : "ASCII",
1767 type->u.integer.base,
1768 #if __BYTE_ORDER == __BIG_ENDIAN
1769 type->u.integer.reverse_byte_order ? " byte_order = le;" : ""
1770 #else
1771 type->u.integer.reverse_byte_order ? " byte_order = be;" : ""
1772 #endif
1773 );
1774 return ret;
1775 }
1776
1777 /*
1778 * Must be called with sessions_mutex held.
1779 */
1780 static
1781 int _lttng_struct_type_statedump(struct lttng_session *session,
1782 const struct lttng_type *type,
1783 size_t nesting)
1784 {
1785 int ret;
1786 uint32_t i, nr_fields;
1787 unsigned int alignment;
1788
1789 WARN_ON_ONCE(type->atype != atype_struct_nestable);
1790
1791 ret = print_tabs(session, nesting);
1792 if (ret)
1793 return ret;
1794 ret = lttng_metadata_printf(session,
1795 "struct {\n");
1796 if (ret)
1797 return ret;
1798 nr_fields = type->u.struct_nestable.nr_fields;
1799 for (i = 0; i < nr_fields; i++) {
1800 const struct lttng_event_field *iter_field;
1801
1802 iter_field = &type->u.struct_nestable.fields[i];
1803 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
1804 if (ret)
1805 return ret;
1806 }
1807 ret = print_tabs(session, nesting);
1808 if (ret)
1809 return ret;
1810 alignment = type->u.struct_nestable.alignment;
1811 if (alignment) {
1812 ret = lttng_metadata_printf(session,
1813 "} align(%u)",
1814 alignment);
1815 } else {
1816 ret = lttng_metadata_printf(session,
1817 "}");
1818 }
1819 return ret;
1820 }
1821
1822 /*
1823 * Must be called with sessions_mutex held.
1824 */
1825 static
1826 int _lttng_struct_field_statedump(struct lttng_session *session,
1827 const struct lttng_event_field *field,
1828 size_t nesting)
1829 {
1830 int ret;
1831
1832 ret = _lttng_struct_type_statedump(session,
1833 &field->type, nesting);
1834 if (ret)
1835 return ret;
1836 return lttng_field_name_statedump(session, field, nesting);
1837 }
1838
1839 /*
1840 * Must be called with sessions_mutex held.
1841 */
1842 static
1843 int _lttng_variant_type_statedump(struct lttng_session *session,
1844 const struct lttng_type *type,
1845 size_t nesting)
1846 {
1847 int ret;
1848 uint32_t i, nr_choices;
1849
1850 WARN_ON_ONCE(type->atype != atype_variant_nestable);
1851 /*
1852 * CTF 1.8 does not allow expressing nonzero variant alignment in a nestable way.
1853 */
1854 if (type->u.variant_nestable.alignment != 0)
1855 return -EINVAL;
1856 ret = print_tabs(session, nesting);
1857 if (ret)
1858 return ret;
1859 ret = lttng_metadata_printf(session,
1860 "variant <_%s> {\n",
1861 type->u.variant_nestable.tag_name);
1862 if (ret)
1863 return ret;
1864 nr_choices = type->u.variant_nestable.nr_choices;
1865 for (i = 0; i < nr_choices; i++) {
1866 const struct lttng_event_field *iter_field;
1867
1868 iter_field = &type->u.variant_nestable.choices[i];
1869 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
1870 if (ret)
1871 return ret;
1872 }
1873 ret = print_tabs(session, nesting);
1874 if (ret)
1875 return ret;
1876 ret = lttng_metadata_printf(session,
1877 "}");
1878 return ret;
1879 }
1880
1881 /*
1882 * Must be called with sessions_mutex held.
1883 */
1884 static
1885 int _lttng_variant_field_statedump(struct lttng_session *session,
1886 const struct lttng_event_field *field,
1887 size_t nesting)
1888 {
1889 int ret;
1890
1891 ret = _lttng_variant_type_statedump(session,
1892 &field->type, nesting);
1893 if (ret)
1894 return ret;
1895 return lttng_field_name_statedump(session, field, nesting);
1896 }
1897
1898 /*
1899 * Must be called with sessions_mutex held.
1900 */
1901 static
1902 int _lttng_array_field_statedump(struct lttng_session *session,
1903 const struct lttng_event_field *field,
1904 size_t nesting)
1905 {
1906 int ret;
1907 const struct lttng_type *elem_type;
1908
1909 WARN_ON_ONCE(field->type.atype != atype_array_nestable);
1910
1911 if (field->type.u.array_nestable.alignment) {
1912 ret = print_tabs(session, nesting);
1913 if (ret)
1914 return ret;
1915 ret = lttng_metadata_printf(session,
1916 "struct { } align(%u) _%s_padding;\n",
1917 field->type.u.array_nestable.alignment * CHAR_BIT,
1918 field->name);
1919 if (ret)
1920 return ret;
1921 }
1922 /*
1923 * Nested compound types: Only array of structures and variants are
1924 * currently supported.
1925 */
1926 elem_type = field->type.u.array_nestable.elem_type;
1927 switch (elem_type->atype) {
1928 case atype_integer:
1929 case atype_struct_nestable:
1930 case atype_variant_nestable:
1931 ret = _lttng_type_statedump(session, elem_type, nesting);
1932 if (ret)
1933 return ret;
1934 break;
1935
1936 default:
1937 return -EINVAL;
1938 }
1939 ret = lttng_metadata_printf(session,
1940 " _%s[%u];\n",
1941 field->name,
1942 field->type.u.array_nestable.length);
1943 return ret;
1944 }
1945
1946 /*
1947 * Must be called with sessions_mutex held.
1948 */
1949 static
1950 int _lttng_sequence_field_statedump(struct lttng_session *session,
1951 const struct lttng_event_field *field,
1952 size_t nesting)
1953 {
1954 int ret;
1955 const char *length_name;
1956 const struct lttng_type *elem_type;
1957
1958 WARN_ON_ONCE(field->type.atype != atype_sequence_nestable);
1959
1960 length_name = field->type.u.sequence_nestable.length_name;
1961
1962 if (field->type.u.sequence_nestable.alignment) {
1963 ret = print_tabs(session, nesting);
1964 if (ret)
1965 return ret;
1966 ret = lttng_metadata_printf(session,
1967 "struct { } align(%u) _%s_padding;\n",
1968 field->type.u.sequence_nestable.alignment * CHAR_BIT,
1969 field->name);
1970 if (ret)
1971 return ret;
1972 }
1973
1974 /*
1975 * Nested compound types: Only array of structures and variants are
1976 * currently supported.
1977 */
1978 elem_type = field->type.u.sequence_nestable.elem_type;
1979 switch (elem_type->atype) {
1980 case atype_integer:
1981 case atype_struct_nestable:
1982 case atype_variant_nestable:
1983 ret = _lttng_type_statedump(session, elem_type, nesting);
1984 if (ret)
1985 return ret;
1986 break;
1987
1988 default:
1989 return -EINVAL;
1990 }
1991 ret = lttng_metadata_printf(session,
1992 " _%s[ _%s ];\n",
1993 field->name,
1994 field->type.u.sequence_nestable.length_name);
1995 return ret;
1996 }
1997
1998 /*
1999 * Must be called with sessions_mutex held.
2000 */
2001 static
2002 int _lttng_enum_type_statedump(struct lttng_session *session,
2003 const struct lttng_type *type,
2004 size_t nesting)
2005 {
2006 const struct lttng_enum_desc *enum_desc;
2007 const struct lttng_type *container_type;
2008 int ret;
2009 unsigned int i, nr_entries;
2010
2011 container_type = type->u.enum_nestable.container_type;
2012 if (container_type->atype != atype_integer) {
2013 ret = -EINVAL;
2014 goto end;
2015 }
2016 enum_desc = type->u.enum_nestable.desc;
2017 nr_entries = enum_desc->nr_entries;
2018
2019 ret = print_tabs(session, nesting);
2020 if (ret)
2021 goto end;
2022 ret = lttng_metadata_printf(session, "enum : ");
2023 if (ret)
2024 goto end;
2025 ret = _lttng_integer_type_statedump(session, container_type, 0);
2026 if (ret)
2027 goto end;
2028 ret = lttng_metadata_printf(session, " {\n");
2029 if (ret)
2030 goto end;
2031 /* Dump all entries */
2032 for (i = 0; i < nr_entries; i++) {
2033 const struct lttng_enum_entry *entry = &enum_desc->entries[i];
2034 int j, len;
2035
2036 ret = print_tabs(session, nesting + 1);
2037 if (ret)
2038 goto end;
2039 ret = lttng_metadata_printf(session,
2040 "\"");
2041 if (ret)
2042 goto end;
2043 len = strlen(entry->string);
2044 /* Escape the character '"' */
2045 for (j = 0; j < len; j++) {
2046 char c = entry->string[j];
2047
2048 switch (c) {
2049 case '"':
2050 ret = lttng_metadata_printf(session,
2051 "\\\"");
2052 break;
2053 case '\\':
2054 ret = lttng_metadata_printf(session,
2055 "\\\\");
2056 break;
2057 default:
2058 ret = lttng_metadata_printf(session,
2059 "%c", c);
2060 break;
2061 }
2062 if (ret)
2063 goto end;
2064 }
2065 ret = lttng_metadata_printf(session, "\"");
2066 if (ret)
2067 goto end;
2068
2069 if (entry->options.is_auto) {
2070 ret = lttng_metadata_printf(session, ",\n");
2071 if (ret)
2072 goto end;
2073 } else {
2074 ret = lttng_metadata_printf(session,
2075 " = ");
2076 if (ret)
2077 goto end;
2078 if (entry->start.signedness)
2079 ret = lttng_metadata_printf(session,
2080 "%lld", (long long) entry->start.value);
2081 else
2082 ret = lttng_metadata_printf(session,
2083 "%llu", entry->start.value);
2084 if (ret)
2085 goto end;
2086 if (entry->start.signedness == entry->end.signedness &&
2087 entry->start.value
2088 == entry->end.value) {
2089 ret = lttng_metadata_printf(session,
2090 ",\n");
2091 } else {
2092 if (entry->end.signedness) {
2093 ret = lttng_metadata_printf(session,
2094 " ... %lld,\n",
2095 (long long) entry->end.value);
2096 } else {
2097 ret = lttng_metadata_printf(session,
2098 " ... %llu,\n",
2099 entry->end.value);
2100 }
2101 }
2102 if (ret)
2103 goto end;
2104 }
2105 }
2106 ret = print_tabs(session, nesting);
2107 if (ret)
2108 goto end;
2109 ret = lttng_metadata_printf(session, "}");
2110 end:
2111 return ret;
2112 }
2113
2114 /*
2115 * Must be called with sessions_mutex held.
2116 */
2117 static
2118 int _lttng_enum_field_statedump(struct lttng_session *session,
2119 const struct lttng_event_field *field,
2120 size_t nesting)
2121 {
2122 int ret;
2123
2124 ret = _lttng_enum_type_statedump(session, &field->type, nesting);
2125 if (ret)
2126 return ret;
2127 return lttng_field_name_statedump(session, field, nesting);
2128 }
2129
2130 static
2131 int _lttng_integer_field_statedump(struct lttng_session *session,
2132 const struct lttng_event_field *field,
2133 size_t nesting)
2134 {
2135 int ret;
2136
2137 ret = _lttng_integer_type_statedump(session, &field->type, nesting);
2138 if (ret)
2139 return ret;
2140 return lttng_field_name_statedump(session, field, nesting);
2141 }
2142
2143 static
2144 int _lttng_string_type_statedump(struct lttng_session *session,
2145 const struct lttng_type *type,
2146 size_t nesting)
2147 {
2148 int ret;
2149
2150 WARN_ON_ONCE(type->atype != atype_string);
2151 /* Default encoding is UTF8 */
2152 ret = print_tabs(session, nesting);
2153 if (ret)
2154 return ret;
2155 ret = lttng_metadata_printf(session,
2156 "string%s",
2157 type->u.string.encoding == lttng_encode_ASCII ?
2158 " { encoding = ASCII; }" : "");
2159 return ret;
2160 }
2161
2162 static
2163 int _lttng_string_field_statedump(struct lttng_session *session,
2164 const struct lttng_event_field *field,
2165 size_t nesting)
2166 {
2167 int ret;
2168
2169 WARN_ON_ONCE(field->type.atype != atype_string);
2170 ret = _lttng_string_type_statedump(session, &field->type, nesting);
2171 if (ret)
2172 return ret;
2173 return lttng_field_name_statedump(session, field, nesting);
2174 }
2175
2176 /*
2177 * Must be called with sessions_mutex held.
2178 */
2179 static
2180 int _lttng_type_statedump(struct lttng_session *session,
2181 const struct lttng_type *type,
2182 size_t nesting)
2183 {
2184 int ret = 0;
2185
2186 switch (type->atype) {
2187 case atype_integer:
2188 ret = _lttng_integer_type_statedump(session, type, nesting);
2189 break;
2190 case atype_enum_nestable:
2191 ret = _lttng_enum_type_statedump(session, type, nesting);
2192 break;
2193 case atype_string:
2194 ret = _lttng_string_type_statedump(session, type, nesting);
2195 break;
2196 case atype_struct_nestable:
2197 ret = _lttng_struct_type_statedump(session, type, nesting);
2198 break;
2199 case atype_variant_nestable:
2200 ret = _lttng_variant_type_statedump(session, type, nesting);
2201 break;
2202
2203 /* Nested arrays and sequences are not supported yet. */
2204 case atype_array_nestable:
2205 case atype_sequence_nestable:
2206 default:
2207 WARN_ON_ONCE(1);
2208 return -EINVAL;
2209 }
2210 return ret;
2211 }
2212
2213 /*
2214 * Must be called with sessions_mutex held.
2215 */
2216 static
2217 int _lttng_field_statedump(struct lttng_session *session,
2218 const struct lttng_event_field *field,
2219 size_t nesting)
2220 {
2221 int ret = 0;
2222
2223 switch (field->type.atype) {
2224 case atype_integer:
2225 ret = _lttng_integer_field_statedump(session, field, nesting);
2226 break;
2227 case atype_enum_nestable:
2228 ret = _lttng_enum_field_statedump(session, field, nesting);
2229 break;
2230 case atype_string:
2231 ret = _lttng_string_field_statedump(session, field, nesting);
2232 break;
2233 case atype_struct_nestable:
2234 ret = _lttng_struct_field_statedump(session, field, nesting);
2235 break;
2236 case atype_array_nestable:
2237 ret = _lttng_array_field_statedump(session, field, nesting);
2238 break;
2239 case atype_sequence_nestable:
2240 ret = _lttng_sequence_field_statedump(session, field, nesting);
2241 break;
2242 case atype_variant_nestable:
2243 ret = _lttng_variant_field_statedump(session, field, nesting);
2244 break;
2245
2246 default:
2247 WARN_ON_ONCE(1);
2248 return -EINVAL;
2249 }
2250 return ret;
2251 }
2252
2253 static
2254 int _lttng_context_metadata_statedump(struct lttng_session *session,
2255 struct lttng_ctx *ctx)
2256 {
2257 int ret = 0;
2258 int i;
2259
2260 if (!ctx)
2261 return 0;
2262 for (i = 0; i < ctx->nr_fields; i++) {
2263 const struct lttng_ctx_field *field = &ctx->fields[i];
2264
2265 ret = _lttng_field_statedump(session, &field->event_field, 2);
2266 if (ret)
2267 return ret;
2268 }
2269 return ret;
2270 }
2271
2272 static
2273 int _lttng_fields_metadata_statedump(struct lttng_session *session,
2274 struct lttng_event *event)
2275 {
2276 const struct lttng_event_desc *desc = event->desc;
2277 int ret = 0;
2278 int i;
2279
2280 for (i = 0; i < desc->nr_fields; i++) {
2281 const struct lttng_event_field *field = &desc->fields[i];
2282
2283 ret = _lttng_field_statedump(session, field, 2);
2284 if (ret)
2285 return ret;
2286 }
2287 return ret;
2288 }
2289
2290 /*
2291 * Must be called with sessions_mutex held.
2292 */
2293 static
2294 int _lttng_event_metadata_statedump(struct lttng_session *session,
2295 struct lttng_channel *chan,
2296 struct lttng_event *event)
2297 {
2298 int ret = 0;
2299
2300 if (event->metadata_dumped || !READ_ONCE(session->active))
2301 return 0;
2302 if (chan->channel_type == METADATA_CHANNEL)
2303 return 0;
2304
2305 ret = lttng_metadata_printf(session,
2306 "event {\n"
2307 " name = \"%s\";\n"
2308 " id = %u;\n"
2309 " stream_id = %u;\n",
2310 event->desc->name,
2311 event->id,
2312 event->chan->id);
2313 if (ret)
2314 goto end;
2315
2316 if (event->ctx) {
2317 ret = lttng_metadata_printf(session,
2318 " context := struct {\n");
2319 if (ret)
2320 goto end;
2321 }
2322 ret = _lttng_context_metadata_statedump(session, event->ctx);
2323 if (ret)
2324 goto end;
2325 if (event->ctx) {
2326 ret = lttng_metadata_printf(session,
2327 " };\n");
2328 if (ret)
2329 goto end;
2330 }
2331
2332 ret = lttng_metadata_printf(session,
2333 " fields := struct {\n"
2334 );
2335 if (ret)
2336 goto end;
2337
2338 ret = _lttng_fields_metadata_statedump(session, event);
2339 if (ret)
2340 goto end;
2341
2342 /*
2343 * LTTng space reservation can only reserve multiples of the
2344 * byte size.
2345 */
2346 ret = lttng_metadata_printf(session,
2347 " };\n"
2348 "};\n\n");
2349 if (ret)
2350 goto end;
2351
2352 event->metadata_dumped = 1;
2353 end:
2354 return ret;
2355
2356 }
2357
2358 /*
2359 * Must be called with sessions_mutex held.
2360 */
2361 static
2362 int _lttng_channel_metadata_statedump(struct lttng_session *session,
2363 struct lttng_channel *chan)
2364 {
2365 int ret = 0;
2366
2367 if (chan->metadata_dumped || !READ_ONCE(session->active))
2368 return 0;
2369
2370 if (chan->channel_type == METADATA_CHANNEL)
2371 return 0;
2372
2373 WARN_ON_ONCE(!chan->header_type);
2374 ret = lttng_metadata_printf(session,
2375 "stream {\n"
2376 " id = %u;\n"
2377 " event.header := %s;\n"
2378 " packet.context := struct packet_context;\n",
2379 chan->id,
2380 chan->header_type == 1 ? "struct event_header_compact" :
2381 "struct event_header_large");
2382 if (ret)
2383 goto end;
2384
2385 if (chan->ctx) {
2386 ret = lttng_metadata_printf(session,
2387 " event.context := struct {\n");
2388 if (ret)
2389 goto end;
2390 }
2391 ret = _lttng_context_metadata_statedump(session, chan->ctx);
2392 if (ret)
2393 goto end;
2394 if (chan->ctx) {
2395 ret = lttng_metadata_printf(session,
2396 " };\n");
2397 if (ret)
2398 goto end;
2399 }
2400
2401 ret = lttng_metadata_printf(session,
2402 "};\n\n");
2403
2404 chan->metadata_dumped = 1;
2405 end:
2406 return ret;
2407 }
2408
2409 /*
2410 * Must be called with sessions_mutex held.
2411 */
2412 static
2413 int _lttng_stream_packet_context_declare(struct lttng_session *session)
2414 {
2415 return lttng_metadata_printf(session,
2416 "struct packet_context {\n"
2417 " uint64_clock_monotonic_t timestamp_begin;\n"
2418 " uint64_clock_monotonic_t timestamp_end;\n"
2419 " uint64_t content_size;\n"
2420 " uint64_t packet_size;\n"
2421 " uint64_t packet_seq_num;\n"
2422 " unsigned long events_discarded;\n"
2423 " uint32_t cpu_id;\n"
2424 "};\n\n"
2425 );
2426 }
2427
2428 /*
2429 * Compact header:
2430 * id: range: 0 - 30.
2431 * id 31 is reserved to indicate an extended header.
2432 *
2433 * Large header:
2434 * id: range: 0 - 65534.
2435 * id 65535 is reserved to indicate an extended header.
2436 *
2437 * Must be called with sessions_mutex held.
2438 */
2439 static
2440 int _lttng_event_header_declare(struct lttng_session *session)
2441 {
2442 return lttng_metadata_printf(session,
2443 "struct event_header_compact {\n"
2444 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2445 " variant <id> {\n"
2446 " struct {\n"
2447 " uint27_clock_monotonic_t timestamp;\n"
2448 " } compact;\n"
2449 " struct {\n"
2450 " uint32_t id;\n"
2451 " uint64_clock_monotonic_t timestamp;\n"
2452 " } extended;\n"
2453 " } v;\n"
2454 "} align(%u);\n"
2455 "\n"
2456 "struct event_header_large {\n"
2457 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2458 " variant <id> {\n"
2459 " struct {\n"
2460 " uint32_clock_monotonic_t timestamp;\n"
2461 " } compact;\n"
2462 " struct {\n"
2463 " uint32_t id;\n"
2464 " uint64_clock_monotonic_t timestamp;\n"
2465 " } extended;\n"
2466 " } v;\n"
2467 "} align(%u);\n\n",
2468 lttng_alignof(uint32_t) * CHAR_BIT,
2469 lttng_alignof(uint16_t) * CHAR_BIT
2470 );
2471 }
2472
2473 /*
2474 * Approximation of NTP time of day to clock monotonic correlation,
2475 * taken at start of trace.
2476 * Yes, this is only an approximation. Yes, we can (and will) do better
2477 * in future versions.
2478 * This function may return a negative offset. It may happen if the
2479 * system sets the REALTIME clock to 0 after boot.
2480 *
2481 * Use 64bit timespec on kernels that have it, this makes 32bit arch
2482 * y2038 compliant.
2483 */
2484 static
2485 int64_t measure_clock_offset(void)
2486 {
2487 uint64_t monotonic_avg, monotonic[2], realtime;
2488 uint64_t tcf = trace_clock_freq();
2489 int64_t offset;
2490 unsigned long flags;
2491 struct timespec64 rts = { 0, 0 };
2492
2493 /* Disable interrupts to increase correlation precision. */
2494 local_irq_save(flags);
2495 monotonic[0] = trace_clock_read64();
2496 ktime_get_real_ts64(&rts);
2497 monotonic[1] = trace_clock_read64();
2498 local_irq_restore(flags);
2499
2500 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2501 realtime = (uint64_t) rts.tv_sec * tcf;
2502 if (tcf == NSEC_PER_SEC) {
2503 realtime += rts.tv_nsec;
2504 } else {
2505 uint64_t n = rts.tv_nsec * tcf;
2506
2507 do_div(n, NSEC_PER_SEC);
2508 realtime += n;
2509 }
2510 offset = (int64_t) realtime - monotonic_avg;
2511 return offset;
2512 }
2513
2514 static
2515 int print_escaped_ctf_string(struct lttng_session *session, const char *string)
2516 {
2517 int ret = 0;
2518 size_t i;
2519 char cur;
2520
2521 i = 0;
2522 cur = string[i];
2523 while (cur != '\0') {
2524 switch (cur) {
2525 case '\n':
2526 ret = lttng_metadata_printf(session, "%s", "\\n");
2527 break;
2528 case '\\':
2529 case '"':
2530 ret = lttng_metadata_printf(session, "%c", '\\');
2531 if (ret)
2532 goto error;
2533 /* We still print the current char */
2534 /* Fallthrough */
2535 default:
2536 ret = lttng_metadata_printf(session, "%c", cur);
2537 break;
2538 }
2539
2540 if (ret)
2541 goto error;
2542
2543 cur = string[++i];
2544 }
2545 error:
2546 return ret;
2547 }
2548
2549 static
2550 int print_metadata_escaped_field(struct lttng_session *session, const char *field,
2551 const char *field_value)
2552 {
2553 int ret;
2554
2555 ret = lttng_metadata_printf(session, " %s = \"", field);
2556 if (ret)
2557 goto error;
2558
2559 ret = print_escaped_ctf_string(session, field_value);
2560 if (ret)
2561 goto error;
2562
2563 ret = lttng_metadata_printf(session, "\";\n");
2564
2565 error:
2566 return ret;
2567 }
2568
2569 /*
2570 * Output metadata into this session's metadata buffers.
2571 * Must be called with sessions_mutex held.
2572 */
2573 static
2574 int _lttng_session_metadata_statedump(struct lttng_session *session)
2575 {
2576 unsigned char *uuid_c = session->uuid.b;
2577 unsigned char uuid_s[LTTNG_MODULES_UUID_STR_LEN], clock_uuid_s[LTTNG_MODULES_UUID_STR_LEN];
2578 const char *product_uuid;
2579 struct lttng_channel *chan;
2580 struct lttng_event *event;
2581 int ret = 0;
2582
2583 if (!READ_ONCE(session->active))
2584 return 0;
2585 if (session->metadata_dumped)
2586 goto skip_session;
2587
2588 snprintf(uuid_s, sizeof(uuid_s),
2589 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2590 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
2591 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
2592 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
2593 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
2594
2595 ret = lttng_metadata_printf(session,
2596 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2597 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2598 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2599 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
2600 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
2601 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2602 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
2603 "\n"
2604 "trace {\n"
2605 " major = %u;\n"
2606 " minor = %u;\n"
2607 " uuid = \"%s\";\n"
2608 " byte_order = %s;\n"
2609 " packet.header := struct {\n"
2610 " uint32_t magic;\n"
2611 " uint8_t uuid[16];\n"
2612 " uint32_t stream_id;\n"
2613 " uint64_t stream_instance_id;\n"
2614 " };\n"
2615 "};\n\n",
2616 lttng_alignof(uint8_t) * CHAR_BIT,
2617 lttng_alignof(uint16_t) * CHAR_BIT,
2618 lttng_alignof(uint32_t) * CHAR_BIT,
2619 lttng_alignof(uint64_t) * CHAR_BIT,
2620 sizeof(unsigned long) * CHAR_BIT,
2621 lttng_alignof(unsigned long) * CHAR_BIT,
2622 CTF_SPEC_MAJOR,
2623 CTF_SPEC_MINOR,
2624 uuid_s,
2625 #if __BYTE_ORDER == __BIG_ENDIAN
2626 "be"
2627 #else
2628 "le"
2629 #endif
2630 );
2631 if (ret)
2632 goto end;
2633
2634 ret = lttng_metadata_printf(session,
2635 "env {\n"
2636 " hostname = \"%s\";\n"
2637 " domain = \"kernel\";\n"
2638 " sysname = \"%s\";\n"
2639 " kernel_release = \"%s\";\n"
2640 " kernel_version = \"%s\";\n"
2641 " tracer_name = \"lttng-modules\";\n"
2642 " tracer_major = %d;\n"
2643 " tracer_minor = %d;\n"
2644 " tracer_patchlevel = %d;\n"
2645 " trace_buffering_scheme = \"global\";\n",
2646 current->nsproxy->uts_ns->name.nodename,
2647 utsname()->sysname,
2648 utsname()->release,
2649 utsname()->version,
2650 LTTNG_MODULES_MAJOR_VERSION,
2651 LTTNG_MODULES_MINOR_VERSION,
2652 LTTNG_MODULES_PATCHLEVEL_VERSION
2653 );
2654 if (ret)
2655 goto end;
2656
2657 ret = print_metadata_escaped_field(session, "trace_name", session->name);
2658 if (ret)
2659 goto end;
2660 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
2661 session->creation_time);
2662 if (ret)
2663 goto end;
2664
2665 /* Add the product UUID to the 'env' section */
2666 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
2667 if (product_uuid) {
2668 ret = lttng_metadata_printf(session,
2669 " product_uuid = \"%s\";\n",
2670 product_uuid
2671 );
2672 if (ret)
2673 goto end;
2674 }
2675
2676 /* Close the 'env' section */
2677 ret = lttng_metadata_printf(session, "};\n\n");
2678 if (ret)
2679 goto end;
2680
2681 ret = lttng_metadata_printf(session,
2682 "clock {\n"
2683 " name = \"%s\";\n",
2684 trace_clock_name()
2685 );
2686 if (ret)
2687 goto end;
2688
2689 if (!trace_clock_uuid(clock_uuid_s)) {
2690 ret = lttng_metadata_printf(session,
2691 " uuid = \"%s\";\n",
2692 clock_uuid_s
2693 );
2694 if (ret)
2695 goto end;
2696 }
2697
2698 ret = lttng_metadata_printf(session,
2699 " description = \"%s\";\n"
2700 " freq = %llu; /* Frequency, in Hz */\n"
2701 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
2702 " offset = %lld;\n"
2703 "};\n\n",
2704 trace_clock_description(),
2705 (unsigned long long) trace_clock_freq(),
2706 (long long) measure_clock_offset()
2707 );
2708 if (ret)
2709 goto end;
2710
2711 ret = lttng_metadata_printf(session,
2712 "typealias integer {\n"
2713 " size = 27; align = 1; signed = false;\n"
2714 " map = clock.%s.value;\n"
2715 "} := uint27_clock_monotonic_t;\n"
2716 "\n"
2717 "typealias integer {\n"
2718 " size = 32; align = %u; signed = false;\n"
2719 " map = clock.%s.value;\n"
2720 "} := uint32_clock_monotonic_t;\n"
2721 "\n"
2722 "typealias integer {\n"
2723 " size = 64; align = %u; signed = false;\n"
2724 " map = clock.%s.value;\n"
2725 "} := uint64_clock_monotonic_t;\n\n",
2726 trace_clock_name(),
2727 lttng_alignof(uint32_t) * CHAR_BIT,
2728 trace_clock_name(),
2729 lttng_alignof(uint64_t) * CHAR_BIT,
2730 trace_clock_name()
2731 );
2732 if (ret)
2733 goto end;
2734
2735 ret = _lttng_stream_packet_context_declare(session);
2736 if (ret)
2737 goto end;
2738
2739 ret = _lttng_event_header_declare(session);
2740 if (ret)
2741 goto end;
2742
2743 skip_session:
2744 list_for_each_entry(chan, &session->chan, list) {
2745 ret = _lttng_channel_metadata_statedump(session, chan);
2746 if (ret)
2747 goto end;
2748 }
2749
2750 list_for_each_entry(event, &session->events, list) {
2751 ret = _lttng_event_metadata_statedump(session, event->chan, event);
2752 if (ret)
2753 goto end;
2754 }
2755 session->metadata_dumped = 1;
2756 end:
2757 return ret;
2758 }
2759
2760 /**
2761 * lttng_transport_register - LTT transport registration
2762 * @transport: transport structure
2763 *
2764 * Registers a transport which can be used as output to extract the data out of
2765 * LTTng.
2766 */
2767 void lttng_transport_register(struct lttng_transport *transport)
2768 {
2769 mutex_lock(&sessions_mutex);
2770 list_add_tail(&transport->node, &lttng_transport_list);
2771 mutex_unlock(&sessions_mutex);
2772 }
2773 EXPORT_SYMBOL_GPL(lttng_transport_register);
2774
2775 /**
2776 * lttng_transport_unregister - LTT transport unregistration
2777 * @transport: transport structure
2778 */
2779 void lttng_transport_unregister(struct lttng_transport *transport)
2780 {
2781 mutex_lock(&sessions_mutex);
2782 list_del(&transport->node);
2783 mutex_unlock(&sessions_mutex);
2784 }
2785 EXPORT_SYMBOL_GPL(lttng_transport_unregister);
2786
2787 enum cpuhp_state lttng_hp_prepare;
2788 enum cpuhp_state lttng_hp_online;
2789
2790 static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
2791 {
2792 struct lttng_cpuhp_node *lttng_node;
2793
2794 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2795 switch (lttng_node->component) {
2796 case LTTNG_RING_BUFFER_FRONTEND:
2797 return 0;
2798 case LTTNG_RING_BUFFER_BACKEND:
2799 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
2800 case LTTNG_RING_BUFFER_ITER:
2801 return 0;
2802 case LTTNG_CONTEXT_PERF_COUNTERS:
2803 return 0;
2804 default:
2805 return -EINVAL;
2806 }
2807 }
2808
2809 static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
2810 {
2811 struct lttng_cpuhp_node *lttng_node;
2812
2813 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2814 switch (lttng_node->component) {
2815 case LTTNG_RING_BUFFER_FRONTEND:
2816 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
2817 case LTTNG_RING_BUFFER_BACKEND:
2818 return 0;
2819 case LTTNG_RING_BUFFER_ITER:
2820 return 0;
2821 case LTTNG_CONTEXT_PERF_COUNTERS:
2822 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
2823 default:
2824 return -EINVAL;
2825 }
2826 }
2827
2828 static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
2829 {
2830 struct lttng_cpuhp_node *lttng_node;
2831
2832 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2833 switch (lttng_node->component) {
2834 case LTTNG_RING_BUFFER_FRONTEND:
2835 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
2836 case LTTNG_RING_BUFFER_BACKEND:
2837 return 0;
2838 case LTTNG_RING_BUFFER_ITER:
2839 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
2840 case LTTNG_CONTEXT_PERF_COUNTERS:
2841 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
2842 default:
2843 return -EINVAL;
2844 }
2845 }
2846
2847 static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
2848 {
2849 struct lttng_cpuhp_node *lttng_node;
2850
2851 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2852 switch (lttng_node->component) {
2853 case LTTNG_RING_BUFFER_FRONTEND:
2854 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
2855 case LTTNG_RING_BUFFER_BACKEND:
2856 return 0;
2857 case LTTNG_RING_BUFFER_ITER:
2858 return 0;
2859 case LTTNG_CONTEXT_PERF_COUNTERS:
2860 return 0;
2861 default:
2862 return -EINVAL;
2863 }
2864 }
2865
2866 static int __init lttng_init_cpu_hotplug(void)
2867 {
2868 int ret;
2869
2870 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
2871 lttng_hotplug_prepare,
2872 lttng_hotplug_dead);
2873 if (ret < 0) {
2874 return ret;
2875 }
2876 lttng_hp_prepare = ret;
2877 lttng_rb_set_hp_prepare(ret);
2878
2879 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
2880 lttng_hotplug_online,
2881 lttng_hotplug_offline);
2882 if (ret < 0) {
2883 cpuhp_remove_multi_state(lttng_hp_prepare);
2884 lttng_hp_prepare = 0;
2885 return ret;
2886 }
2887 lttng_hp_online = ret;
2888 lttng_rb_set_hp_online(ret);
2889
2890 return 0;
2891 }
2892
2893 static void __exit lttng_exit_cpu_hotplug(void)
2894 {
2895 lttng_rb_set_hp_online(0);
2896 cpuhp_remove_multi_state(lttng_hp_online);
2897 lttng_rb_set_hp_prepare(0);
2898 cpuhp_remove_multi_state(lttng_hp_prepare);
2899 }
2900
2901 static int __init lttng_events_init(void)
2902 {
2903 int ret;
2904
2905 ret = lttng_probes_init();
2906 if (ret)
2907 return ret;
2908 ret = lttng_context_init();
2909 if (ret)
2910 return ret;
2911 ret = lttng_tracepoint_init();
2912 if (ret)
2913 goto error_tp;
2914 event_cache = KMEM_CACHE(lttng_event, 0);
2915 if (!event_cache) {
2916 ret = -ENOMEM;
2917 goto error_kmem;
2918 }
2919 ret = lttng_abi_init();
2920 if (ret)
2921 goto error_abi;
2922 ret = lttng_logger_init();
2923 if (ret)
2924 goto error_logger;
2925 ret = lttng_init_cpu_hotplug();
2926 if (ret)
2927 goto error_hotplug;
2928 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
2929 __stringify(LTTNG_MODULES_MAJOR_VERSION),
2930 __stringify(LTTNG_MODULES_MINOR_VERSION),
2931 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
2932 LTTNG_MODULES_EXTRAVERSION,
2933 LTTNG_VERSION_NAME,
2934 #ifdef LTTNG_EXTRA_VERSION_GIT
2935 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
2936 #else
2937 "",
2938 #endif
2939 #ifdef LTTNG_EXTRA_VERSION_NAME
2940 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
2941 #else
2942 "");
2943 #endif
2944 return 0;
2945
2946 error_hotplug:
2947 lttng_logger_exit();
2948 error_logger:
2949 lttng_abi_exit();
2950 error_abi:
2951 kmem_cache_destroy(event_cache);
2952 error_kmem:
2953 lttng_tracepoint_exit();
2954 error_tp:
2955 lttng_context_exit();
2956 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
2957 __stringify(LTTNG_MODULES_MAJOR_VERSION),
2958 __stringify(LTTNG_MODULES_MINOR_VERSION),
2959 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
2960 LTTNG_MODULES_EXTRAVERSION,
2961 LTTNG_VERSION_NAME,
2962 #ifdef LTTNG_EXTRA_VERSION_GIT
2963 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
2964 #else
2965 "",
2966 #endif
2967 #ifdef LTTNG_EXTRA_VERSION_NAME
2968 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
2969 #else
2970 "");
2971 #endif
2972 return ret;
2973 }
2974
2975 module_init(lttng_events_init);
2976
2977 static void __exit lttng_events_exit(void)
2978 {
2979 struct lttng_session *session, *tmpsession;
2980
2981 lttng_exit_cpu_hotplug();
2982 lttng_logger_exit();
2983 lttng_abi_exit();
2984 list_for_each_entry_safe(session, tmpsession, &sessions, list)
2985 lttng_session_destroy(session);
2986 kmem_cache_destroy(event_cache);
2987 lttng_tracepoint_exit();
2988 lttng_context_exit();
2989 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
2990 __stringify(LTTNG_MODULES_MAJOR_VERSION),
2991 __stringify(LTTNG_MODULES_MINOR_VERSION),
2992 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
2993 LTTNG_MODULES_EXTRAVERSION,
2994 LTTNG_VERSION_NAME,
2995 #ifdef LTTNG_EXTRA_VERSION_GIT
2996 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
2997 #else
2998 "",
2999 #endif
3000 #ifdef LTTNG_EXTRA_VERSION_NAME
3001 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
3002 #else
3003 "");
3004 #endif
3005 }
3006
3007 module_exit(lttng_events_exit);
3008
3009 #include "extra_version/patches.i"
3010 #ifdef LTTNG_EXTRA_VERSION_GIT
3011 MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
3012 #endif
3013 #ifdef LTTNG_EXTRA_VERSION_NAME
3014 MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
3015 #endif
3016 MODULE_LICENSE("GPL and additional rights");
3017 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
3018 MODULE_DESCRIPTION("LTTng tracer");
3019 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
3020 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
3021 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
3022 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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