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Add uprobes support
[lttng-modules.git] / lttng-events.c
1 /* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
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/jhash.h>
28 #include <linux/uaccess.h>
29 #include <linux/vmalloc.h>
30
31 #include <wrapper/uuid.h>
32 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */
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-tracer.h>
40 #include <lttng-abi-old.h>
41 #include <lttng-endian.h>
42 #include <lttng-string-utils.h>
43 #include <wrapper/vzalloc.h>
44 #include <wrapper/ringbuffer/backend.h>
45 #include <wrapper/ringbuffer/frontend.h>
46
47 #define METADATA_CACHE_DEFAULT_SIZE 4096
48
49 static LIST_HEAD(sessions);
50 static LIST_HEAD(lttng_transport_list);
51 /*
52 * Protect the sessions and metadata caches.
53 */
54 static DEFINE_MUTEX(sessions_mutex);
55 static struct kmem_cache *event_cache;
56
57 static void lttng_session_lazy_sync_enablers(struct lttng_session *session);
58 static void lttng_session_sync_enablers(struct lttng_session *session);
59 static void lttng_enabler_destroy(struct lttng_enabler *enabler);
60
61 static void _lttng_event_destroy(struct lttng_event *event);
62 static void _lttng_channel_destroy(struct lttng_channel *chan);
63 static int _lttng_event_unregister(struct lttng_event *event);
64 static
65 int _lttng_event_metadata_statedump(struct lttng_session *session,
66 struct lttng_channel *chan,
67 struct lttng_event *event);
68 static
69 int _lttng_session_metadata_statedump(struct lttng_session *session);
70 static
71 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream);
72 static
73 int _lttng_field_statedump(struct lttng_session *session,
74 const struct lttng_event_field *field,
75 size_t nesting);
76
77 void synchronize_trace(void)
78 {
79 synchronize_sched();
80 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
81 #ifdef CONFIG_PREEMPT_RT_FULL
82 synchronize_rcu();
83 #endif
84 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
85 #ifdef CONFIG_PREEMPT_RT
86 synchronize_rcu();
87 #endif
88 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
89 }
90
91 void lttng_lock_sessions(void)
92 {
93 mutex_lock(&sessions_mutex);
94 }
95
96 void lttng_unlock_sessions(void)
97 {
98 mutex_unlock(&sessions_mutex);
99 }
100
101 /*
102 * Called with sessions lock held.
103 */
104 int lttng_session_active(void)
105 {
106 struct lttng_session *iter;
107
108 list_for_each_entry(iter, &sessions, list) {
109 if (iter->active)
110 return 1;
111 }
112 return 0;
113 }
114
115 struct lttng_session *lttng_session_create(void)
116 {
117 struct lttng_session *session;
118 struct lttng_metadata_cache *metadata_cache;
119 int i;
120
121 mutex_lock(&sessions_mutex);
122 session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL);
123 if (!session)
124 goto err;
125 INIT_LIST_HEAD(&session->chan);
126 INIT_LIST_HEAD(&session->events);
127 uuid_le_gen(&session->uuid);
128
129 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
130 GFP_KERNEL);
131 if (!metadata_cache)
132 goto err_free_session;
133 metadata_cache->data = lttng_vzalloc(METADATA_CACHE_DEFAULT_SIZE);
134 if (!metadata_cache->data)
135 goto err_free_cache;
136 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
137 kref_init(&metadata_cache->refcount);
138 mutex_init(&metadata_cache->lock);
139 session->metadata_cache = metadata_cache;
140 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
141 memcpy(&metadata_cache->uuid, &session->uuid,
142 sizeof(metadata_cache->uuid));
143 INIT_LIST_HEAD(&session->enablers_head);
144 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
145 INIT_HLIST_HEAD(&session->events_ht.table[i]);
146 list_add(&session->list, &sessions);
147 mutex_unlock(&sessions_mutex);
148 return session;
149
150 err_free_cache:
151 kfree(metadata_cache);
152 err_free_session:
153 lttng_kvfree(session);
154 err:
155 mutex_unlock(&sessions_mutex);
156 return NULL;
157 }
158
159 void metadata_cache_destroy(struct kref *kref)
160 {
161 struct lttng_metadata_cache *cache =
162 container_of(kref, struct lttng_metadata_cache, refcount);
163 vfree(cache->data);
164 kfree(cache);
165 }
166
167 void lttng_session_destroy(struct lttng_session *session)
168 {
169 struct lttng_channel *chan, *tmpchan;
170 struct lttng_event *event, *tmpevent;
171 struct lttng_metadata_stream *metadata_stream;
172 struct lttng_enabler *enabler, *tmpenabler;
173 int ret;
174
175 mutex_lock(&sessions_mutex);
176 WRITE_ONCE(session->active, 0);
177 list_for_each_entry(chan, &session->chan, list) {
178 ret = lttng_syscalls_unregister(chan);
179 WARN_ON(ret);
180 }
181 list_for_each_entry(event, &session->events, list) {
182 ret = _lttng_event_unregister(event);
183 WARN_ON(ret);
184 }
185 synchronize_trace(); /* Wait for in-flight events to complete */
186 list_for_each_entry_safe(enabler, tmpenabler,
187 &session->enablers_head, node)
188 lttng_enabler_destroy(enabler);
189 list_for_each_entry_safe(event, tmpevent, &session->events, list)
190 _lttng_event_destroy(event);
191 list_for_each_entry_safe(chan, tmpchan, &session->chan, list) {
192 BUG_ON(chan->channel_type == METADATA_CHANNEL);
193 _lttng_channel_destroy(chan);
194 }
195 list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list)
196 _lttng_metadata_channel_hangup(metadata_stream);
197 if (session->pid_tracker)
198 lttng_pid_tracker_destroy(session->pid_tracker);
199 kref_put(&session->metadata_cache->refcount, metadata_cache_destroy);
200 list_del(&session->list);
201 mutex_unlock(&sessions_mutex);
202 lttng_kvfree(session);
203 }
204
205 int lttng_session_statedump(struct lttng_session *session)
206 {
207 int ret;
208
209 mutex_lock(&sessions_mutex);
210 ret = lttng_statedump_start(session);
211 mutex_unlock(&sessions_mutex);
212 return ret;
213 }
214
215 int lttng_session_enable(struct lttng_session *session)
216 {
217 int ret = 0;
218 struct lttng_channel *chan;
219
220 mutex_lock(&sessions_mutex);
221 if (session->active) {
222 ret = -EBUSY;
223 goto end;
224 }
225
226 /* Set transient enabler state to "enabled" */
227 session->tstate = 1;
228
229 /*
230 * Snapshot the number of events per channel to know the type of header
231 * we need to use.
232 */
233 list_for_each_entry(chan, &session->chan, list) {
234 if (chan->header_type)
235 continue; /* don't change it if session stop/restart */
236 if (chan->free_event_id < 31)
237 chan->header_type = 1; /* compact */
238 else
239 chan->header_type = 2; /* large */
240 }
241
242 /* We need to sync enablers with session before activation. */
243 lttng_session_sync_enablers(session);
244
245 /* Clear each stream's quiescent state. */
246 list_for_each_entry(chan, &session->chan, list) {
247 if (chan->channel_type != METADATA_CHANNEL)
248 lib_ring_buffer_clear_quiescent_channel(chan->chan);
249 }
250
251 WRITE_ONCE(session->active, 1);
252 WRITE_ONCE(session->been_active, 1);
253 ret = _lttng_session_metadata_statedump(session);
254 if (ret) {
255 WRITE_ONCE(session->active, 0);
256 goto end;
257 }
258 ret = lttng_statedump_start(session);
259 if (ret)
260 WRITE_ONCE(session->active, 0);
261 end:
262 mutex_unlock(&sessions_mutex);
263 return ret;
264 }
265
266 int lttng_session_disable(struct lttng_session *session)
267 {
268 int ret = 0;
269 struct lttng_channel *chan;
270
271 mutex_lock(&sessions_mutex);
272 if (!session->active) {
273 ret = -EBUSY;
274 goto end;
275 }
276 WRITE_ONCE(session->active, 0);
277
278 /* Set transient enabler state to "disabled" */
279 session->tstate = 0;
280 lttng_session_sync_enablers(session);
281
282 /* Set each stream's quiescent state. */
283 list_for_each_entry(chan, &session->chan, list) {
284 if (chan->channel_type != METADATA_CHANNEL)
285 lib_ring_buffer_set_quiescent_channel(chan->chan);
286 }
287 end:
288 mutex_unlock(&sessions_mutex);
289 return ret;
290 }
291
292 int lttng_session_metadata_regenerate(struct lttng_session *session)
293 {
294 int ret = 0;
295 struct lttng_channel *chan;
296 struct lttng_event *event;
297 struct lttng_metadata_cache *cache = session->metadata_cache;
298 struct lttng_metadata_stream *stream;
299
300 mutex_lock(&sessions_mutex);
301 if (!session->active) {
302 ret = -EBUSY;
303 goto end;
304 }
305
306 mutex_lock(&cache->lock);
307 memset(cache->data, 0, cache->cache_alloc);
308 cache->metadata_written = 0;
309 cache->version++;
310 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) {
311 stream->metadata_out = 0;
312 stream->metadata_in = 0;
313 }
314 mutex_unlock(&cache->lock);
315
316 session->metadata_dumped = 0;
317 list_for_each_entry(chan, &session->chan, list) {
318 chan->metadata_dumped = 0;
319 }
320
321 list_for_each_entry(event, &session->events, list) {
322 event->metadata_dumped = 0;
323 }
324
325 ret = _lttng_session_metadata_statedump(session);
326
327 end:
328 mutex_unlock(&sessions_mutex);
329 return ret;
330 }
331
332 int lttng_channel_enable(struct lttng_channel *channel)
333 {
334 int ret = 0;
335
336 mutex_lock(&sessions_mutex);
337 if (channel->channel_type == METADATA_CHANNEL) {
338 ret = -EPERM;
339 goto end;
340 }
341 if (channel->enabled) {
342 ret = -EEXIST;
343 goto end;
344 }
345 /* Set transient enabler state to "enabled" */
346 channel->tstate = 1;
347 lttng_session_sync_enablers(channel->session);
348 /* Set atomically the state to "enabled" */
349 WRITE_ONCE(channel->enabled, 1);
350 end:
351 mutex_unlock(&sessions_mutex);
352 return ret;
353 }
354
355 int lttng_channel_disable(struct lttng_channel *channel)
356 {
357 int ret = 0;
358
359 mutex_lock(&sessions_mutex);
360 if (channel->channel_type == METADATA_CHANNEL) {
361 ret = -EPERM;
362 goto end;
363 }
364 if (!channel->enabled) {
365 ret = -EEXIST;
366 goto end;
367 }
368 /* Set atomically the state to "disabled" */
369 WRITE_ONCE(channel->enabled, 0);
370 /* Set transient enabler state to "enabled" */
371 channel->tstate = 0;
372 lttng_session_sync_enablers(channel->session);
373 end:
374 mutex_unlock(&sessions_mutex);
375 return ret;
376 }
377
378 int lttng_event_enable(struct lttng_event *event)
379 {
380 int ret = 0;
381
382 mutex_lock(&sessions_mutex);
383 if (event->chan->channel_type == METADATA_CHANNEL) {
384 ret = -EPERM;
385 goto end;
386 }
387 if (event->enabled) {
388 ret = -EEXIST;
389 goto end;
390 }
391 switch (event->instrumentation) {
392 case LTTNG_KERNEL_TRACEPOINT:
393 case LTTNG_KERNEL_SYSCALL:
394 ret = -EINVAL;
395 break;
396 case LTTNG_KERNEL_KPROBE:
397 case LTTNG_KERNEL_FUNCTION:
398 case LTTNG_KERNEL_UPROBE:
399 case LTTNG_KERNEL_NOOP:
400 WRITE_ONCE(event->enabled, 1);
401 break;
402 case LTTNG_KERNEL_KRETPROBE:
403 ret = lttng_kretprobes_event_enable_state(event, 1);
404 break;
405 default:
406 WARN_ON_ONCE(1);
407 ret = -EINVAL;
408 }
409 end:
410 mutex_unlock(&sessions_mutex);
411 return ret;
412 }
413
414 int lttng_event_disable(struct lttng_event *event)
415 {
416 int ret = 0;
417
418 mutex_lock(&sessions_mutex);
419 if (event->chan->channel_type == METADATA_CHANNEL) {
420 ret = -EPERM;
421 goto end;
422 }
423 if (!event->enabled) {
424 ret = -EEXIST;
425 goto end;
426 }
427 switch (event->instrumentation) {
428 case LTTNG_KERNEL_TRACEPOINT:
429 case LTTNG_KERNEL_SYSCALL:
430 ret = -EINVAL;
431 break;
432 case LTTNG_KERNEL_KPROBE:
433 case LTTNG_KERNEL_FUNCTION:
434 case LTTNG_KERNEL_UPROBE:
435 case LTTNG_KERNEL_NOOP:
436 WRITE_ONCE(event->enabled, 0);
437 break;
438 case LTTNG_KERNEL_KRETPROBE:
439 ret = lttng_kretprobes_event_enable_state(event, 0);
440 break;
441 default:
442 WARN_ON_ONCE(1);
443 ret = -EINVAL;
444 }
445 end:
446 mutex_unlock(&sessions_mutex);
447 return ret;
448 }
449
450 static struct lttng_transport *lttng_transport_find(const char *name)
451 {
452 struct lttng_transport *transport;
453
454 list_for_each_entry(transport, &lttng_transport_list, node) {
455 if (!strcmp(transport->name, name))
456 return transport;
457 }
458 return NULL;
459 }
460
461 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
462 const char *transport_name,
463 void *buf_addr,
464 size_t subbuf_size, size_t num_subbuf,
465 unsigned int switch_timer_interval,
466 unsigned int read_timer_interval,
467 enum channel_type channel_type)
468 {
469 struct lttng_channel *chan;
470 struct lttng_transport *transport = NULL;
471
472 mutex_lock(&sessions_mutex);
473 if (session->been_active && channel_type != METADATA_CHANNEL)
474 goto active; /* Refuse to add channel to active session */
475 transport = lttng_transport_find(transport_name);
476 if (!transport) {
477 printk(KERN_WARNING "LTTng transport %s not found\n",
478 transport_name);
479 goto notransport;
480 }
481 if (!try_module_get(transport->owner)) {
482 printk(KERN_WARNING "LTT : Can't lock transport module.\n");
483 goto notransport;
484 }
485 chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL);
486 if (!chan)
487 goto nomem;
488 chan->session = session;
489 chan->id = session->free_chan_id++;
490 chan->ops = &transport->ops;
491 /*
492 * Note: the channel creation op already writes into the packet
493 * headers. Therefore the "chan" information used as input
494 * should be already accessible.
495 */
496 chan->chan = transport->ops.channel_create(transport_name,
497 chan, buf_addr, subbuf_size, num_subbuf,
498 switch_timer_interval, read_timer_interval);
499 if (!chan->chan)
500 goto create_error;
501 chan->tstate = 1;
502 chan->enabled = 1;
503 chan->transport = transport;
504 chan->channel_type = channel_type;
505 list_add(&chan->list, &session->chan);
506 mutex_unlock(&sessions_mutex);
507 return chan;
508
509 create_error:
510 kfree(chan);
511 nomem:
512 if (transport)
513 module_put(transport->owner);
514 notransport:
515 active:
516 mutex_unlock(&sessions_mutex);
517 return NULL;
518 }
519
520 /*
521 * Only used internally at session destruction for per-cpu channels, and
522 * when metadata channel is released.
523 * Needs to be called with sessions mutex held.
524 */
525 static
526 void _lttng_channel_destroy(struct lttng_channel *chan)
527 {
528 chan->ops->channel_destroy(chan->chan);
529 module_put(chan->transport->owner);
530 list_del(&chan->list);
531 lttng_destroy_context(chan->ctx);
532 kfree(chan);
533 }
534
535 void lttng_metadata_channel_destroy(struct lttng_channel *chan)
536 {
537 BUG_ON(chan->channel_type != METADATA_CHANNEL);
538
539 /* Protect the metadata cache with the sessions_mutex. */
540 mutex_lock(&sessions_mutex);
541 _lttng_channel_destroy(chan);
542 mutex_unlock(&sessions_mutex);
543 }
544 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
545
546 static
547 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
548 {
549 stream->finalized = 1;
550 wake_up_interruptible(&stream->read_wait);
551 }
552
553 /*
554 * Supports event creation while tracing session is active.
555 * Needs to be called with sessions mutex held.
556 */
557 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
558 struct lttng_kernel_event *event_param,
559 void *filter,
560 const struct lttng_event_desc *event_desc,
561 enum lttng_kernel_instrumentation itype)
562 {
563 struct lttng_session *session = chan->session;
564 struct lttng_event *event;
565 const char *event_name;
566 struct hlist_head *head;
567 size_t name_len;
568 uint32_t hash;
569 int ret;
570
571 if (chan->free_event_id == -1U) {
572 ret = -EMFILE;
573 goto full;
574 }
575
576 switch (itype) {
577 case LTTNG_KERNEL_TRACEPOINT:
578 event_name = event_desc->name;
579 break;
580 case LTTNG_KERNEL_KPROBE:
581 case LTTNG_KERNEL_UPROBE:
582 case LTTNG_KERNEL_KRETPROBE:
583 case LTTNG_KERNEL_FUNCTION:
584 case LTTNG_KERNEL_NOOP:
585 case LTTNG_KERNEL_SYSCALL:
586 event_name = event_param->name;
587 break;
588 default:
589 WARN_ON_ONCE(1);
590 ret = -EINVAL;
591 goto type_error;
592 }
593 name_len = strlen(event_name);
594 hash = jhash(event_name, name_len, 0);
595 head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)];
596 lttng_hlist_for_each_entry(event, head, hlist) {
597 WARN_ON_ONCE(!event->desc);
598 if (!strncmp(event->desc->name, event_name,
599 LTTNG_KERNEL_SYM_NAME_LEN - 1)
600 && chan == event->chan) {
601 ret = -EEXIST;
602 goto exist;
603 }
604 }
605
606 event = kmem_cache_zalloc(event_cache, GFP_KERNEL);
607 if (!event) {
608 ret = -ENOMEM;
609 goto cache_error;
610 }
611 event->chan = chan;
612 event->filter = filter;
613 event->id = chan->free_event_id++;
614 event->instrumentation = itype;
615 event->evtype = LTTNG_TYPE_EVENT;
616 INIT_LIST_HEAD(&event->bytecode_runtime_head);
617 INIT_LIST_HEAD(&event->enablers_ref_head);
618
619 switch (itype) {
620 case LTTNG_KERNEL_TRACEPOINT:
621 /* Event will be enabled by enabler sync. */
622 event->enabled = 0;
623 event->registered = 0;
624 event->desc = lttng_event_get(event_name);
625 if (!event->desc) {
626 ret = -ENOENT;
627 goto register_error;
628 }
629 /* Populate lttng_event structure before event registration. */
630 smp_wmb();
631 break;
632 case LTTNG_KERNEL_KPROBE:
633 /*
634 * Needs to be explicitly enabled after creation, since
635 * we may want to apply filters.
636 */
637 event->enabled = 0;
638 event->registered = 1;
639 /*
640 * Populate lttng_event structure before event
641 * registration.
642 */
643 smp_wmb();
644 ret = lttng_kprobes_register(event_name,
645 event_param->u.kprobe.symbol_name,
646 event_param->u.kprobe.offset,
647 event_param->u.kprobe.addr,
648 event);
649 if (ret) {
650 ret = -EINVAL;
651 goto register_error;
652 }
653 ret = try_module_get(event->desc->owner);
654 WARN_ON_ONCE(!ret);
655 break;
656 case LTTNG_KERNEL_KRETPROBE:
657 {
658 struct lttng_event *event_return;
659
660 /* kretprobe defines 2 events */
661 /*
662 * Needs to be explicitly enabled after creation, since
663 * we may want to apply filters.
664 */
665 event->enabled = 0;
666 event->registered = 1;
667 event_return =
668 kmem_cache_zalloc(event_cache, GFP_KERNEL);
669 if (!event_return) {
670 ret = -ENOMEM;
671 goto register_error;
672 }
673 event_return->chan = chan;
674 event_return->filter = filter;
675 event_return->id = chan->free_event_id++;
676 event_return->enabled = 0;
677 event_return->registered = 1;
678 event_return->instrumentation = itype;
679 /*
680 * Populate lttng_event structure before kretprobe registration.
681 */
682 smp_wmb();
683 ret = lttng_kretprobes_register(event_name,
684 event_param->u.kretprobe.symbol_name,
685 event_param->u.kretprobe.offset,
686 event_param->u.kretprobe.addr,
687 event, event_return);
688 if (ret) {
689 kmem_cache_free(event_cache, event_return);
690 ret = -EINVAL;
691 goto register_error;
692 }
693 /* Take 2 refs on the module: one per event. */
694 ret = try_module_get(event->desc->owner);
695 WARN_ON_ONCE(!ret);
696 ret = try_module_get(event->desc->owner);
697 WARN_ON_ONCE(!ret);
698 ret = _lttng_event_metadata_statedump(chan->session, chan,
699 event_return);
700 WARN_ON_ONCE(ret > 0);
701 if (ret) {
702 kmem_cache_free(event_cache, event_return);
703 module_put(event->desc->owner);
704 module_put(event->desc->owner);
705 goto statedump_error;
706 }
707 list_add(&event_return->list, &chan->session->events);
708 break;
709 }
710 case LTTNG_KERNEL_FUNCTION:
711 /*
712 * Needs to be explicitly enabled after creation, since
713 * we may want to apply filters.
714 */
715 event->enabled = 0;
716 event->registered = 1;
717 /*
718 * Populate lttng_event structure before event
719 * registration.
720 */
721 smp_wmb();
722 ret = lttng_ftrace_register(event_name,
723 event_param->u.ftrace.symbol_name,
724 event);
725 if (ret) {
726 goto register_error;
727 }
728 ret = try_module_get(event->desc->owner);
729 WARN_ON_ONCE(!ret);
730 break;
731 case LTTNG_KERNEL_NOOP:
732 case LTTNG_KERNEL_SYSCALL:
733 /*
734 * Needs to be explicitly enabled after creation, since
735 * we may want to apply filters.
736 */
737 event->enabled = 0;
738 event->registered = 0;
739 event->desc = event_desc;
740 if (!event->desc) {
741 ret = -EINVAL;
742 goto register_error;
743 }
744 break;
745 case LTTNG_KERNEL_UPROBE:
746
747 ret = lttng_uprobes_register(event_param->name,
748 event_param->u.uprobe.path,
749 event_param->u.uprobe.offset,
750 event);
751 if (ret)
752 goto register_error;
753 ret = try_module_get(event->desc->owner);
754 WARN_ON_ONCE(!ret);
755 break;
756 default:
757 WARN_ON_ONCE(1);
758 ret = -EINVAL;
759 goto register_error;
760 }
761 ret = _lttng_event_metadata_statedump(chan->session, chan, event);
762 WARN_ON_ONCE(ret > 0);
763 if (ret) {
764 goto statedump_error;
765 }
766 hlist_add_head(&event->hlist, head);
767 list_add(&event->list, &chan->session->events);
768 return event;
769
770 statedump_error:
771 /* If a statedump error occurs, events will not be readable. */
772 register_error:
773 kmem_cache_free(event_cache, event);
774 cache_error:
775 exist:
776 type_error:
777 full:
778 return ERR_PTR(ret);
779 }
780
781 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
782 struct lttng_kernel_event *event_param,
783 void *filter,
784 const struct lttng_event_desc *event_desc,
785 enum lttng_kernel_instrumentation itype)
786 {
787 struct lttng_event *event;
788
789 mutex_lock(&sessions_mutex);
790 event = _lttng_event_create(chan, event_param, filter, event_desc,
791 itype);
792 mutex_unlock(&sessions_mutex);
793 return event;
794 }
795
796 /* Only used for tracepoints for now. */
797 static
798 void register_event(struct lttng_event *event)
799 {
800 const struct lttng_event_desc *desc;
801 int ret = -EINVAL;
802
803 if (event->registered)
804 return;
805
806 desc = event->desc;
807 switch (event->instrumentation) {
808 case LTTNG_KERNEL_TRACEPOINT:
809 ret = lttng_wrapper_tracepoint_probe_register(desc->kname,
810 desc->probe_callback,
811 event);
812 break;
813 case LTTNG_KERNEL_SYSCALL:
814 ret = lttng_syscall_filter_enable(event->chan,
815 desc->name);
816 break;
817 case LTTNG_KERNEL_KPROBE:
818 case LTTNG_KERNEL_KRETPROBE:
819 case LTTNG_KERNEL_FUNCTION:
820 case LTTNG_KERNEL_NOOP:
821 ret = 0;
822 break;
823 default:
824 WARN_ON_ONCE(1);
825 }
826 if (!ret)
827 event->registered = 1;
828 }
829
830 /*
831 * Only used internally at session destruction.
832 */
833 int _lttng_event_unregister(struct lttng_event *event)
834 {
835 const struct lttng_event_desc *desc;
836 int ret = -EINVAL;
837
838 if (!event->registered)
839 return 0;
840
841 desc = event->desc;
842 switch (event->instrumentation) {
843 case LTTNG_KERNEL_TRACEPOINT:
844 ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname,
845 event->desc->probe_callback,
846 event);
847 break;
848 case LTTNG_KERNEL_KPROBE:
849 lttng_kprobes_unregister(event);
850 ret = 0;
851 break;
852 case LTTNG_KERNEL_KRETPROBE:
853 lttng_kretprobes_unregister(event);
854 ret = 0;
855 break;
856 case LTTNG_KERNEL_FUNCTION:
857 lttng_ftrace_unregister(event);
858 ret = 0;
859 break;
860 case LTTNG_KERNEL_SYSCALL:
861 ret = lttng_syscall_filter_disable(event->chan,
862 desc->name);
863 break;
864 case LTTNG_KERNEL_NOOP:
865 ret = 0;
866 break;
867 case LTTNG_KERNEL_UPROBE:
868 lttng_uprobes_unregister(event);
869 ret = 0;
870 break;
871 default:
872 WARN_ON_ONCE(1);
873 }
874 if (!ret)
875 event->registered = 0;
876 return ret;
877 }
878
879 /*
880 * Only used internally at session destruction.
881 */
882 static
883 void _lttng_event_destroy(struct lttng_event *event)
884 {
885 switch (event->instrumentation) {
886 case LTTNG_KERNEL_TRACEPOINT:
887 lttng_event_put(event->desc);
888 break;
889 case LTTNG_KERNEL_KPROBE:
890 module_put(event->desc->owner);
891 lttng_kprobes_destroy_private(event);
892 break;
893 case LTTNG_KERNEL_KRETPROBE:
894 module_put(event->desc->owner);
895 lttng_kretprobes_destroy_private(event);
896 break;
897 case LTTNG_KERNEL_FUNCTION:
898 module_put(event->desc->owner);
899 lttng_ftrace_destroy_private(event);
900 break;
901 case LTTNG_KERNEL_NOOP:
902 case LTTNG_KERNEL_SYSCALL:
903 break;
904 case LTTNG_KERNEL_UPROBE:
905 module_put(event->desc->owner);
906 lttng_uprobes_destroy_private(event);
907 break;
908 default:
909 WARN_ON_ONCE(1);
910 }
911 list_del(&event->list);
912 lttng_destroy_context(event->ctx);
913 kmem_cache_free(event_cache, event);
914 }
915
916 int lttng_session_track_pid(struct lttng_session *session, int pid)
917 {
918 int ret;
919
920 if (pid < -1)
921 return -EINVAL;
922 mutex_lock(&sessions_mutex);
923 if (pid == -1) {
924 /* track all pids: destroy tracker. */
925 if (session->pid_tracker) {
926 struct lttng_pid_tracker *lpf;
927
928 lpf = session->pid_tracker;
929 rcu_assign_pointer(session->pid_tracker, NULL);
930 synchronize_trace();
931 lttng_pid_tracker_destroy(lpf);
932 }
933 ret = 0;
934 } else {
935 if (!session->pid_tracker) {
936 struct lttng_pid_tracker *lpf;
937
938 lpf = lttng_pid_tracker_create();
939 if (!lpf) {
940 ret = -ENOMEM;
941 goto unlock;
942 }
943 ret = lttng_pid_tracker_add(lpf, pid);
944 rcu_assign_pointer(session->pid_tracker, lpf);
945 } else {
946 ret = lttng_pid_tracker_add(session->pid_tracker, pid);
947 }
948 }
949 unlock:
950 mutex_unlock(&sessions_mutex);
951 return ret;
952 }
953
954 int lttng_session_untrack_pid(struct lttng_session *session, int pid)
955 {
956 int ret;
957
958 if (pid < -1)
959 return -EINVAL;
960 mutex_lock(&sessions_mutex);
961 if (pid == -1) {
962 /* untrack all pids: replace by empty tracker. */
963 struct lttng_pid_tracker *old_lpf = session->pid_tracker;
964 struct lttng_pid_tracker *lpf;
965
966 lpf = lttng_pid_tracker_create();
967 if (!lpf) {
968 ret = -ENOMEM;
969 goto unlock;
970 }
971 rcu_assign_pointer(session->pid_tracker, lpf);
972 synchronize_trace();
973 if (old_lpf)
974 lttng_pid_tracker_destroy(old_lpf);
975 ret = 0;
976 } else {
977 if (!session->pid_tracker) {
978 ret = -ENOENT;
979 goto unlock;
980 }
981 ret = lttng_pid_tracker_del(session->pid_tracker, pid);
982 }
983 unlock:
984 mutex_unlock(&sessions_mutex);
985 return ret;
986 }
987
988 static
989 void *pid_list_start(struct seq_file *m, loff_t *pos)
990 {
991 struct lttng_session *session = m->private;
992 struct lttng_pid_tracker *lpf;
993 struct lttng_pid_hash_node *e;
994 int iter = 0, i;
995
996 mutex_lock(&sessions_mutex);
997 lpf = session->pid_tracker;
998 if (lpf) {
999 for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) {
1000 struct hlist_head *head = &lpf->pid_hash[i];
1001
1002 lttng_hlist_for_each_entry(e, head, hlist) {
1003 if (iter++ >= *pos)
1004 return e;
1005 }
1006 }
1007 } else {
1008 /* PID tracker disabled. */
1009 if (iter >= *pos && iter == 0) {
1010 return session; /* empty tracker */
1011 }
1012 iter++;
1013 }
1014 /* End of list */
1015 return NULL;
1016 }
1017
1018 /* Called with sessions_mutex held. */
1019 static
1020 void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos)
1021 {
1022 struct lttng_session *session = m->private;
1023 struct lttng_pid_tracker *lpf;
1024 struct lttng_pid_hash_node *e;
1025 int iter = 0, i;
1026
1027 (*ppos)++;
1028 lpf = session->pid_tracker;
1029 if (lpf) {
1030 for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) {
1031 struct hlist_head *head = &lpf->pid_hash[i];
1032
1033 lttng_hlist_for_each_entry(e, head, hlist) {
1034 if (iter++ >= *ppos)
1035 return e;
1036 }
1037 }
1038 } else {
1039 /* PID tracker disabled. */
1040 if (iter >= *ppos && iter == 0)
1041 return session; /* empty tracker */
1042 iter++;
1043 }
1044
1045 /* End of list */
1046 return NULL;
1047 }
1048
1049 static
1050 void pid_list_stop(struct seq_file *m, void *p)
1051 {
1052 mutex_unlock(&sessions_mutex);
1053 }
1054
1055 static
1056 int pid_list_show(struct seq_file *m, void *p)
1057 {
1058 int pid;
1059
1060 if (p == m->private) {
1061 /* Tracker disabled. */
1062 pid = -1;
1063 } else {
1064 const struct lttng_pid_hash_node *e = p;
1065
1066 pid = lttng_pid_tracker_get_node_pid(e);
1067 }
1068 seq_printf(m, "process { pid = %d; };\n", pid);
1069 return 0;
1070 }
1071
1072 static
1073 const struct seq_operations lttng_tracker_pids_list_seq_ops = {
1074 .start = pid_list_start,
1075 .next = pid_list_next,
1076 .stop = pid_list_stop,
1077 .show = pid_list_show,
1078 };
1079
1080 static
1081 int lttng_tracker_pids_list_open(struct inode *inode, struct file *file)
1082 {
1083 return seq_open(file, &lttng_tracker_pids_list_seq_ops);
1084 }
1085
1086 static
1087 int lttng_tracker_pids_list_release(struct inode *inode, struct file *file)
1088 {
1089 struct seq_file *m = file->private_data;
1090 struct lttng_session *session = m->private;
1091 int ret;
1092
1093 WARN_ON_ONCE(!session);
1094 ret = seq_release(inode, file);
1095 if (!ret && session)
1096 fput(session->file);
1097 return ret;
1098 }
1099
1100 const struct file_operations lttng_tracker_pids_list_fops = {
1101 .owner = THIS_MODULE,
1102 .open = lttng_tracker_pids_list_open,
1103 .read = seq_read,
1104 .llseek = seq_lseek,
1105 .release = lttng_tracker_pids_list_release,
1106 };
1107
1108 int lttng_session_list_tracker_pids(struct lttng_session *session)
1109 {
1110 struct file *tracker_pids_list_file;
1111 struct seq_file *m;
1112 int file_fd, ret;
1113
1114 file_fd = lttng_get_unused_fd();
1115 if (file_fd < 0) {
1116 ret = file_fd;
1117 goto fd_error;
1118 }
1119
1120 tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]",
1121 &lttng_tracker_pids_list_fops,
1122 NULL, O_RDWR);
1123 if (IS_ERR(tracker_pids_list_file)) {
1124 ret = PTR_ERR(tracker_pids_list_file);
1125 goto file_error;
1126 }
1127 if (atomic_long_add_unless(&session->file->f_count,
1128 1, INT_MAX) == INT_MAX) {
1129 goto refcount_error;
1130 }
1131 ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file);
1132 if (ret < 0)
1133 goto open_error;
1134 m = tracker_pids_list_file->private_data;
1135 m->private = session;
1136 fd_install(file_fd, tracker_pids_list_file);
1137
1138 return file_fd;
1139
1140 open_error:
1141 atomic_long_dec(&session->file->f_count);
1142 refcount_error:
1143 fput(tracker_pids_list_file);
1144 file_error:
1145 put_unused_fd(file_fd);
1146 fd_error:
1147 return ret;
1148 }
1149
1150 /*
1151 * Enabler management.
1152 */
1153 static
1154 int lttng_match_enabler_star_glob(const char *desc_name,
1155 const char *pattern)
1156 {
1157 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1158 desc_name, LTTNG_SIZE_MAX))
1159 return 0;
1160 return 1;
1161 }
1162
1163 static
1164 int lttng_match_enabler_name(const char *desc_name,
1165 const char *name)
1166 {
1167 if (strcmp(desc_name, name))
1168 return 0;
1169 return 1;
1170 }
1171
1172 static
1173 int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
1174 struct lttng_enabler *enabler)
1175 {
1176 const char *desc_name, *enabler_name;
1177
1178 enabler_name = enabler->event_param.name;
1179 switch (enabler->event_param.instrumentation) {
1180 case LTTNG_KERNEL_TRACEPOINT:
1181 desc_name = desc->name;
1182 break;
1183 case LTTNG_KERNEL_SYSCALL:
1184 desc_name = desc->name;
1185 if (!strncmp(desc_name, "compat_", strlen("compat_")))
1186 desc_name += strlen("compat_");
1187 if (!strncmp(desc_name, "syscall_exit_",
1188 strlen("syscall_exit_"))) {
1189 desc_name += strlen("syscall_exit_");
1190 } else if (!strncmp(desc_name, "syscall_entry_",
1191 strlen("syscall_entry_"))) {
1192 desc_name += strlen("syscall_entry_");
1193 } else {
1194 WARN_ON_ONCE(1);
1195 return -EINVAL;
1196 }
1197 break;
1198 default:
1199 WARN_ON_ONCE(1);
1200 return -EINVAL;
1201 }
1202 switch (enabler->type) {
1203 case LTTNG_ENABLER_STAR_GLOB:
1204 return lttng_match_enabler_star_glob(desc_name, enabler_name);
1205 case LTTNG_ENABLER_NAME:
1206 return lttng_match_enabler_name(desc_name, enabler_name);
1207 default:
1208 return -EINVAL;
1209 }
1210 }
1211
1212 static
1213 int lttng_event_match_enabler(struct lttng_event *event,
1214 struct lttng_enabler *enabler)
1215 {
1216 if (enabler->event_param.instrumentation != event->instrumentation)
1217 return 0;
1218 if (lttng_desc_match_enabler(event->desc, enabler)
1219 && event->chan == enabler->chan)
1220 return 1;
1221 else
1222 return 0;
1223 }
1224
1225 static
1226 struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event,
1227 struct lttng_enabler *enabler)
1228 {
1229 struct lttng_enabler_ref *enabler_ref;
1230
1231 list_for_each_entry(enabler_ref,
1232 &event->enablers_ref_head, node) {
1233 if (enabler_ref->ref == enabler)
1234 return enabler_ref;
1235 }
1236 return NULL;
1237 }
1238
1239 static
1240 void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler)
1241 {
1242 struct lttng_session *session = enabler->chan->session;
1243 struct lttng_probe_desc *probe_desc;
1244 const struct lttng_event_desc *desc;
1245 int i;
1246 struct list_head *probe_list;
1247
1248 probe_list = lttng_get_probe_list_head();
1249 /*
1250 * For each probe event, if we find that a probe event matches
1251 * our enabler, create an associated lttng_event if not
1252 * already present.
1253 */
1254 list_for_each_entry(probe_desc, probe_list, head) {
1255 for (i = 0; i < probe_desc->nr_events; i++) {
1256 int found = 0;
1257 struct hlist_head *head;
1258 const char *event_name;
1259 size_t name_len;
1260 uint32_t hash;
1261 struct lttng_event *event;
1262
1263 desc = probe_desc->event_desc[i];
1264 if (!lttng_desc_match_enabler(desc, enabler))
1265 continue;
1266 event_name = desc->name;
1267 name_len = strlen(event_name);
1268
1269 /*
1270 * Check if already created.
1271 */
1272 hash = jhash(event_name, name_len, 0);
1273 head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)];
1274 lttng_hlist_for_each_entry(event, head, hlist) {
1275 if (event->desc == desc
1276 && event->chan == enabler->chan)
1277 found = 1;
1278 }
1279 if (found)
1280 continue;
1281
1282 /*
1283 * We need to create an event for this
1284 * event probe.
1285 */
1286 event = _lttng_event_create(enabler->chan,
1287 NULL, NULL, desc,
1288 LTTNG_KERNEL_TRACEPOINT);
1289 if (!event) {
1290 printk(KERN_INFO "Unable to create event %s\n",
1291 probe_desc->event_desc[i]->name);
1292 }
1293 }
1294 }
1295 }
1296
1297 static
1298 void lttng_create_syscall_if_missing(struct lttng_enabler *enabler)
1299 {
1300 int ret;
1301
1302 ret = lttng_syscalls_register(enabler->chan, NULL);
1303 WARN_ON_ONCE(ret);
1304 }
1305
1306 /*
1307 * Create struct lttng_event if it is missing and present in the list of
1308 * tracepoint probes.
1309 * Should be called with sessions mutex held.
1310 */
1311 static
1312 void lttng_create_event_if_missing(struct lttng_enabler *enabler)
1313 {
1314 switch (enabler->event_param.instrumentation) {
1315 case LTTNG_KERNEL_TRACEPOINT:
1316 lttng_create_tracepoint_if_missing(enabler);
1317 break;
1318 case LTTNG_KERNEL_SYSCALL:
1319 lttng_create_syscall_if_missing(enabler);
1320 break;
1321 default:
1322 WARN_ON_ONCE(1);
1323 break;
1324 }
1325 }
1326
1327 /*
1328 * Create events associated with an enabler (if not already present),
1329 * and add backward reference from the event to the enabler.
1330 * Should be called with sessions mutex held.
1331 */
1332 static
1333 int lttng_enabler_ref_events(struct lttng_enabler *enabler)
1334 {
1335 struct lttng_session *session = enabler->chan->session;
1336 struct lttng_event *event;
1337
1338 /* First ensure that probe events are created for this enabler. */
1339 lttng_create_event_if_missing(enabler);
1340
1341 /* For each event matching enabler in session event list. */
1342 list_for_each_entry(event, &session->events, list) {
1343 struct lttng_enabler_ref *enabler_ref;
1344
1345 if (!lttng_event_match_enabler(event, enabler))
1346 continue;
1347 enabler_ref = lttng_event_enabler_ref(event, enabler);
1348 if (!enabler_ref) {
1349 /*
1350 * If no backward ref, create it.
1351 * Add backward ref from event to enabler.
1352 */
1353 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
1354 if (!enabler_ref)
1355 return -ENOMEM;
1356 enabler_ref->ref = enabler;
1357 list_add(&enabler_ref->node,
1358 &event->enablers_ref_head);
1359 }
1360
1361 /*
1362 * Link filter bytecodes if not linked yet.
1363 */
1364 lttng_enabler_event_link_bytecode(event, enabler);
1365
1366 /* TODO: merge event context. */
1367 }
1368 return 0;
1369 }
1370
1371 /*
1372 * Called at module load: connect the probe on all enablers matching
1373 * this event.
1374 * Called with sessions lock held.
1375 */
1376 int lttng_fix_pending_events(void)
1377 {
1378 struct lttng_session *session;
1379
1380 list_for_each_entry(session, &sessions, list)
1381 lttng_session_lazy_sync_enablers(session);
1382 return 0;
1383 }
1384
1385 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
1386 struct lttng_kernel_event *event_param,
1387 struct lttng_channel *chan)
1388 {
1389 struct lttng_enabler *enabler;
1390
1391 enabler = kzalloc(sizeof(*enabler), GFP_KERNEL);
1392 if (!enabler)
1393 return NULL;
1394 enabler->type = type;
1395 INIT_LIST_HEAD(&enabler->filter_bytecode_head);
1396 memcpy(&enabler->event_param, event_param,
1397 sizeof(enabler->event_param));
1398 enabler->chan = chan;
1399 /* ctx left NULL */
1400 enabler->enabled = 0;
1401 enabler->evtype = LTTNG_TYPE_ENABLER;
1402 mutex_lock(&sessions_mutex);
1403 list_add(&enabler->node, &enabler->chan->session->enablers_head);
1404 lttng_session_lazy_sync_enablers(enabler->chan->session);
1405 mutex_unlock(&sessions_mutex);
1406 return enabler;
1407 }
1408
1409 int lttng_enabler_enable(struct lttng_enabler *enabler)
1410 {
1411 mutex_lock(&sessions_mutex);
1412 enabler->enabled = 1;
1413 lttng_session_lazy_sync_enablers(enabler->chan->session);
1414 mutex_unlock(&sessions_mutex);
1415 return 0;
1416 }
1417
1418 int lttng_enabler_disable(struct lttng_enabler *enabler)
1419 {
1420 mutex_lock(&sessions_mutex);
1421 enabler->enabled = 0;
1422 lttng_session_lazy_sync_enablers(enabler->chan->session);
1423 mutex_unlock(&sessions_mutex);
1424 return 0;
1425 }
1426
1427 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
1428 struct lttng_kernel_filter_bytecode __user *bytecode)
1429 {
1430 struct lttng_filter_bytecode_node *bytecode_node;
1431 uint32_t bytecode_len;
1432 int ret;
1433
1434 ret = get_user(bytecode_len, &bytecode->len);
1435 if (ret)
1436 return ret;
1437 bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len,
1438 GFP_KERNEL);
1439 if (!bytecode_node)
1440 return -ENOMEM;
1441 ret = copy_from_user(&bytecode_node->bc, bytecode,
1442 sizeof(*bytecode) + bytecode_len);
1443 if (ret)
1444 goto error_free;
1445 bytecode_node->enabler = enabler;
1446 /* Enforce length based on allocated size */
1447 bytecode_node->bc.len = bytecode_len;
1448 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
1449 lttng_session_lazy_sync_enablers(enabler->chan->session);
1450 return 0;
1451
1452 error_free:
1453 kfree(bytecode_node);
1454 return ret;
1455 }
1456
1457 int lttng_enabler_attach_context(struct lttng_enabler *enabler,
1458 struct lttng_kernel_context *context_param)
1459 {
1460 return -ENOSYS;
1461 }
1462
1463 static
1464 void lttng_enabler_destroy(struct lttng_enabler *enabler)
1465 {
1466 struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node;
1467
1468 /* Destroy filter bytecode */
1469 list_for_each_entry_safe(filter_node, tmp_filter_node,
1470 &enabler->filter_bytecode_head, node) {
1471 kfree(filter_node);
1472 }
1473
1474 /* Destroy contexts */
1475 lttng_destroy_context(enabler->ctx);
1476
1477 list_del(&enabler->node);
1478 kfree(enabler);
1479 }
1480
1481 /*
1482 * lttng_session_sync_enablers should be called just before starting a
1483 * session.
1484 * Should be called with sessions mutex held.
1485 */
1486 static
1487 void lttng_session_sync_enablers(struct lttng_session *session)
1488 {
1489 struct lttng_enabler *enabler;
1490 struct lttng_event *event;
1491
1492 list_for_each_entry(enabler, &session->enablers_head, node)
1493 lttng_enabler_ref_events(enabler);
1494 /*
1495 * For each event, if at least one of its enablers is enabled,
1496 * and its channel and session transient states are enabled, we
1497 * enable the event, else we disable it.
1498 */
1499 list_for_each_entry(event, &session->events, list) {
1500 struct lttng_enabler_ref *enabler_ref;
1501 struct lttng_bytecode_runtime *runtime;
1502 int enabled = 0, has_enablers_without_bytecode = 0;
1503
1504 switch (event->instrumentation) {
1505 case LTTNG_KERNEL_TRACEPOINT:
1506 case LTTNG_KERNEL_SYSCALL:
1507 /* Enable events */
1508 list_for_each_entry(enabler_ref,
1509 &event->enablers_ref_head, node) {
1510 if (enabler_ref->ref->enabled) {
1511 enabled = 1;
1512 break;
1513 }
1514 }
1515 break;
1516 default:
1517 /* Not handled with lazy sync. */
1518 continue;
1519 }
1520 /*
1521 * Enabled state is based on union of enablers, with
1522 * intesection of session and channel transient enable
1523 * states.
1524 */
1525 enabled = enabled && session->tstate && event->chan->tstate;
1526
1527 WRITE_ONCE(event->enabled, enabled);
1528 /*
1529 * Sync tracepoint registration with event enabled
1530 * state.
1531 */
1532 if (enabled) {
1533 register_event(event);
1534 } else {
1535 _lttng_event_unregister(event);
1536 }
1537
1538 /* Check if has enablers without bytecode enabled */
1539 list_for_each_entry(enabler_ref,
1540 &event->enablers_ref_head, node) {
1541 if (enabler_ref->ref->enabled
1542 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
1543 has_enablers_without_bytecode = 1;
1544 break;
1545 }
1546 }
1547 event->has_enablers_without_bytecode =
1548 has_enablers_without_bytecode;
1549
1550 /* Enable filters */
1551 list_for_each_entry(runtime,
1552 &event->bytecode_runtime_head, node)
1553 lttng_filter_sync_state(runtime);
1554 }
1555 }
1556
1557 /*
1558 * Apply enablers to session events, adding events to session if need
1559 * be. It is required after each modification applied to an active
1560 * session, and right before session "start".
1561 * "lazy" sync means we only sync if required.
1562 * Should be called with sessions mutex held.
1563 */
1564 static
1565 void lttng_session_lazy_sync_enablers(struct lttng_session *session)
1566 {
1567 /* We can skip if session is not active */
1568 if (!session->active)
1569 return;
1570 lttng_session_sync_enablers(session);
1571 }
1572
1573 /*
1574 * Serialize at most one packet worth of metadata into a metadata
1575 * channel.
1576 * We grab the metadata cache mutex to get exclusive access to our metadata
1577 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1578 * allows us to do racy operations such as looking for remaining space left in
1579 * packet and write, since mutual exclusion protects us from concurrent writes.
1580 * Mutual exclusion on the metadata cache allow us to read the cache content
1581 * without racing against reallocation of the cache by updates.
1582 * Returns the number of bytes written in the channel, 0 if no data
1583 * was written and a negative value on error.
1584 */
1585 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
1586 struct channel *chan)
1587 {
1588 struct lib_ring_buffer_ctx ctx;
1589 int ret = 0;
1590 size_t len, reserve_len;
1591
1592 /*
1593 * Ensure we support mutiple get_next / put sequences followed by
1594 * put_next. The metadata cache lock protects reading the metadata
1595 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1596 * "flush" operations on the buffer invoked by different processes.
1597 * Moreover, since the metadata cache memory can be reallocated, we
1598 * need to have exclusive access against updates even though we only
1599 * read it.
1600 */
1601 mutex_lock(&stream->metadata_cache->lock);
1602 WARN_ON(stream->metadata_in < stream->metadata_out);
1603 if (stream->metadata_in != stream->metadata_out)
1604 goto end;
1605
1606 /* Metadata regenerated, change the version. */
1607 if (stream->metadata_cache->version != stream->version)
1608 stream->version = stream->metadata_cache->version;
1609
1610 len = stream->metadata_cache->metadata_written -
1611 stream->metadata_in;
1612 if (!len)
1613 goto end;
1614 reserve_len = min_t(size_t,
1615 stream->transport->ops.packet_avail_size(chan),
1616 len);
1617 lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len,
1618 sizeof(char), -1);
1619 /*
1620 * If reservation failed, return an error to the caller.
1621 */
1622 ret = stream->transport->ops.event_reserve(&ctx, 0);
1623 if (ret != 0) {
1624 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
1625 goto end;
1626 }
1627 stream->transport->ops.event_write(&ctx,
1628 stream->metadata_cache->data + stream->metadata_in,
1629 reserve_len);
1630 stream->transport->ops.event_commit(&ctx);
1631 stream->metadata_in += reserve_len;
1632 ret = reserve_len;
1633
1634 end:
1635 mutex_unlock(&stream->metadata_cache->lock);
1636 return ret;
1637 }
1638
1639 /*
1640 * Write the metadata to the metadata cache.
1641 * Must be called with sessions_mutex held.
1642 * The metadata cache lock protects us from concurrent read access from
1643 * thread outputting metadata content to ring buffer.
1644 */
1645 int lttng_metadata_printf(struct lttng_session *session,
1646 const char *fmt, ...)
1647 {
1648 char *str;
1649 size_t len;
1650 va_list ap;
1651 struct lttng_metadata_stream *stream;
1652
1653 WARN_ON_ONCE(!READ_ONCE(session->active));
1654
1655 va_start(ap, fmt);
1656 str = kvasprintf(GFP_KERNEL, fmt, ap);
1657 va_end(ap);
1658 if (!str)
1659 return -ENOMEM;
1660
1661 len = strlen(str);
1662 mutex_lock(&session->metadata_cache->lock);
1663 if (session->metadata_cache->metadata_written + len >
1664 session->metadata_cache->cache_alloc) {
1665 char *tmp_cache_realloc;
1666 unsigned int tmp_cache_alloc_size;
1667
1668 tmp_cache_alloc_size = max_t(unsigned int,
1669 session->metadata_cache->cache_alloc + len,
1670 session->metadata_cache->cache_alloc << 1);
1671 tmp_cache_realloc = lttng_vzalloc(tmp_cache_alloc_size);
1672 if (!tmp_cache_realloc)
1673 goto err;
1674 if (session->metadata_cache->data) {
1675 memcpy(tmp_cache_realloc,
1676 session->metadata_cache->data,
1677 session->metadata_cache->cache_alloc);
1678 vfree(session->metadata_cache->data);
1679 }
1680
1681 session->metadata_cache->cache_alloc = tmp_cache_alloc_size;
1682 session->metadata_cache->data = tmp_cache_realloc;
1683 }
1684 memcpy(session->metadata_cache->data +
1685 session->metadata_cache->metadata_written,
1686 str, len);
1687 session->metadata_cache->metadata_written += len;
1688 mutex_unlock(&session->metadata_cache->lock);
1689 kfree(str);
1690
1691 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list)
1692 wake_up_interruptible(&stream->read_wait);
1693
1694 return 0;
1695
1696 err:
1697 mutex_unlock(&session->metadata_cache->lock);
1698 kfree(str);
1699 return -ENOMEM;
1700 }
1701
1702 static
1703 int print_tabs(struct lttng_session *session, size_t nesting)
1704 {
1705 size_t i;
1706
1707 for (i = 0; i < nesting; i++) {
1708 int ret;
1709
1710 ret = lttng_metadata_printf(session, " ");
1711 if (ret) {
1712 return ret;
1713 }
1714 }
1715 return 0;
1716 }
1717
1718 /*
1719 * Must be called with sessions_mutex held.
1720 */
1721 static
1722 int _lttng_struct_type_statedump(struct lttng_session *session,
1723 const struct lttng_type *type,
1724 size_t nesting)
1725 {
1726 int ret;
1727 uint32_t i, nr_fields;
1728
1729 ret = print_tabs(session, nesting);
1730 if (ret)
1731 return ret;
1732 ret = lttng_metadata_printf(session,
1733 "struct {\n");
1734 if (ret)
1735 return ret;
1736 nr_fields = type->u._struct.nr_fields;
1737 for (i = 0; i < nr_fields; i++) {
1738 const struct lttng_event_field *iter_field;
1739
1740 iter_field = &type->u._struct.fields[i];
1741 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
1742 if (ret)
1743 return ret;
1744 }
1745 ret = print_tabs(session, nesting);
1746 if (ret)
1747 return ret;
1748 ret = lttng_metadata_printf(session,
1749 "}");
1750 return ret;
1751 }
1752
1753 /*
1754 * Must be called with sessions_mutex held.
1755 */
1756 static
1757 int _lttng_struct_statedump(struct lttng_session *session,
1758 const struct lttng_event_field *field,
1759 size_t nesting)
1760 {
1761 int ret;
1762
1763 ret = _lttng_struct_type_statedump(session,
1764 &field->type, nesting);
1765 if (ret)
1766 return ret;
1767 ret = lttng_metadata_printf(session,
1768 "_%s;\n",
1769 field->name);
1770 return ret;
1771 }
1772
1773 /*
1774 * Must be called with sessions_mutex held.
1775 */
1776 static
1777 int _lttng_variant_type_statedump(struct lttng_session *session,
1778 const struct lttng_type *type,
1779 size_t nesting)
1780 {
1781 int ret;
1782 uint32_t i, nr_choices;
1783
1784 ret = print_tabs(session, nesting);
1785 if (ret)
1786 return ret;
1787 ret = lttng_metadata_printf(session,
1788 "variant <_%s> {\n",
1789 type->u.variant.tag_name);
1790 if (ret)
1791 return ret;
1792 nr_choices = type->u.variant.nr_choices;
1793 for (i = 0; i < nr_choices; i++) {
1794 const struct lttng_event_field *iter_field;
1795
1796 iter_field = &type->u.variant.choices[i];
1797 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
1798 if (ret)
1799 return ret;
1800 }
1801 ret = print_tabs(session, nesting);
1802 if (ret)
1803 return ret;
1804 ret = lttng_metadata_printf(session,
1805 "}");
1806 return ret;
1807 }
1808
1809 /*
1810 * Must be called with sessions_mutex held.
1811 */
1812 static
1813 int _lttng_variant_statedump(struct lttng_session *session,
1814 const struct lttng_event_field *field,
1815 size_t nesting)
1816 {
1817 int ret;
1818
1819 ret = _lttng_variant_type_statedump(session,
1820 &field->type, nesting);
1821 if (ret)
1822 return ret;
1823 ret = lttng_metadata_printf(session,
1824 "_%s;\n",
1825 field->name);
1826 return ret;
1827 }
1828
1829 /*
1830 * Must be called with sessions_mutex held.
1831 */
1832 static
1833 int _lttng_array_compound_statedump(struct lttng_session *session,
1834 const struct lttng_event_field *field,
1835 size_t nesting)
1836 {
1837 int ret;
1838 const struct lttng_type *elem_type;
1839
1840 /* Only array of structures and variants are currently supported. */
1841 elem_type = field->type.u.array_compound.elem_type;
1842 switch (elem_type->atype) {
1843 case atype_struct:
1844 ret = _lttng_struct_type_statedump(session, elem_type, nesting);
1845 if (ret)
1846 return ret;
1847 break;
1848 case atype_variant:
1849 ret = _lttng_variant_type_statedump(session, elem_type, nesting);
1850 if (ret)
1851 return ret;
1852 break;
1853 default:
1854 return -EINVAL;
1855 }
1856 ret = lttng_metadata_printf(session,
1857 " _%s[%u];\n",
1858 field->name,
1859 field->type.u.array_compound.length);
1860 return ret;
1861 }
1862
1863 /*
1864 * Must be called with sessions_mutex held.
1865 */
1866 static
1867 int _lttng_sequence_compound_statedump(struct lttng_session *session,
1868 const struct lttng_event_field *field,
1869 size_t nesting)
1870 {
1871 int ret;
1872 const char *length_name;
1873 const struct lttng_type *elem_type;
1874
1875 length_name = field->type.u.sequence_compound.length_name;
1876
1877 /* Only array of structures and variants are currently supported. */
1878 elem_type = field->type.u.sequence_compound.elem_type;
1879 switch (elem_type->atype) {
1880 case atype_struct:
1881 ret = _lttng_struct_type_statedump(session, elem_type, nesting);
1882 if (ret)
1883 return ret;
1884 break;
1885 case atype_variant:
1886 ret = _lttng_variant_type_statedump(session, elem_type, nesting);
1887 if (ret)
1888 return ret;
1889 break;
1890 default:
1891 return -EINVAL;
1892 }
1893 ret = lttng_metadata_printf(session,
1894 " _%s[ _%s ];\n",
1895 field->name,
1896 length_name);
1897 return ret;
1898 }
1899
1900 /*
1901 * Must be called with sessions_mutex held.
1902 */
1903 static
1904 int _lttng_enum_statedump(struct lttng_session *session,
1905 const struct lttng_event_field *field,
1906 size_t nesting)
1907 {
1908 const struct lttng_enum_desc *enum_desc;
1909 const struct lttng_integer_type *container_type;
1910 int ret;
1911 unsigned int i, nr_entries;
1912
1913 enum_desc = field->type.u.basic.enumeration.desc;
1914 container_type = &field->type.u.basic.enumeration.container_type;
1915 nr_entries = enum_desc->nr_entries;
1916
1917 ret = print_tabs(session, nesting);
1918 if (ret)
1919 goto end;
1920 ret = lttng_metadata_printf(session,
1921 "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n",
1922 container_type->size,
1923 container_type->alignment,
1924 container_type->signedness,
1925 (container_type->encoding == lttng_encode_none)
1926 ? "none"
1927 : (container_type->encoding == lttng_encode_UTF8)
1928 ? "UTF8"
1929 : "ASCII",
1930 container_type->base,
1931 #if __BYTE_ORDER == __BIG_ENDIAN
1932 container_type->reverse_byte_order ? " byte_order = le;" : ""
1933 #else
1934 container_type->reverse_byte_order ? " byte_order = be;" : ""
1935 #endif
1936 );
1937 if (ret)
1938 goto end;
1939 /* Dump all entries */
1940 for (i = 0; i < nr_entries; i++) {
1941 const struct lttng_enum_entry *entry = &enum_desc->entries[i];
1942 int j, len;
1943
1944 ret = print_tabs(session, nesting + 1);
1945 if (ret)
1946 goto end;
1947 ret = lttng_metadata_printf(session,
1948 "\"");
1949 if (ret)
1950 goto end;
1951 len = strlen(entry->string);
1952 /* Escape the character '"' */
1953 for (j = 0; j < len; j++) {
1954 char c = entry->string[j];
1955
1956 switch (c) {
1957 case '"':
1958 ret = lttng_metadata_printf(session,
1959 "\\\"");
1960 break;
1961 case '\\':
1962 ret = lttng_metadata_printf(session,
1963 "\\\\");
1964 break;
1965 default:
1966 ret = lttng_metadata_printf(session,
1967 "%c", c);
1968 break;
1969 }
1970 if (ret)
1971 goto end;
1972 }
1973 ret = lttng_metadata_printf(session, "\"");
1974 if (ret)
1975 goto end;
1976
1977 if (entry->options.is_auto) {
1978 ret = lttng_metadata_printf(session, ",\n");
1979 if (ret)
1980 goto end;
1981 } else {
1982 ret = lttng_metadata_printf(session,
1983 " = ");
1984 if (ret)
1985 goto end;
1986 if (entry->start.signedness)
1987 ret = lttng_metadata_printf(session,
1988 "%lld", (long long) entry->start.value);
1989 else
1990 ret = lttng_metadata_printf(session,
1991 "%llu", entry->start.value);
1992 if (ret)
1993 goto end;
1994 if (entry->start.signedness == entry->end.signedness &&
1995 entry->start.value
1996 == entry->end.value) {
1997 ret = lttng_metadata_printf(session,
1998 ",\n");
1999 } else {
2000 if (entry->end.signedness) {
2001 ret = lttng_metadata_printf(session,
2002 " ... %lld,\n",
2003 (long long) entry->end.value);
2004 } else {
2005 ret = lttng_metadata_printf(session,
2006 " ... %llu,\n",
2007 entry->end.value);
2008 }
2009 }
2010 if (ret)
2011 goto end;
2012 }
2013 }
2014 ret = print_tabs(session, nesting);
2015 if (ret)
2016 goto end;
2017 ret = lttng_metadata_printf(session, "} _%s;\n",
2018 field->name);
2019 end:
2020 return ret;
2021 }
2022
2023 /*
2024 * Must be called with sessions_mutex held.
2025 */
2026 static
2027 int _lttng_field_statedump(struct lttng_session *session,
2028 const struct lttng_event_field *field,
2029 size_t nesting)
2030 {
2031 int ret = 0;
2032
2033 switch (field->type.atype) {
2034 case atype_integer:
2035 ret = print_tabs(session, nesting);
2036 if (ret)
2037 return ret;
2038 ret = lttng_metadata_printf(session,
2039 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
2040 field->type.u.basic.integer.size,
2041 field->type.u.basic.integer.alignment,
2042 field->type.u.basic.integer.signedness,
2043 (field->type.u.basic.integer.encoding == lttng_encode_none)
2044 ? "none"
2045 : (field->type.u.basic.integer.encoding == lttng_encode_UTF8)
2046 ? "UTF8"
2047 : "ASCII",
2048 field->type.u.basic.integer.base,
2049 #if __BYTE_ORDER == __BIG_ENDIAN
2050 field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
2051 #else
2052 field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
2053 #endif
2054 field->name);
2055 break;
2056 case atype_enum:
2057 ret = _lttng_enum_statedump(session, field, nesting);
2058 break;
2059 case atype_array:
2060 case atype_array_bitfield:
2061 {
2062 const struct lttng_basic_type *elem_type;
2063
2064 elem_type = &field->type.u.array.elem_type;
2065 if (field->type.u.array.elem_alignment) {
2066 ret = print_tabs(session, nesting);
2067 if (ret)
2068 return ret;
2069 ret = lttng_metadata_printf(session,
2070 "struct { } align(%u) _%s_padding;\n",
2071 field->type.u.array.elem_alignment * CHAR_BIT,
2072 field->name);
2073 if (ret)
2074 return ret;
2075 }
2076 ret = print_tabs(session, nesting);
2077 if (ret)
2078 return ret;
2079 ret = lttng_metadata_printf(session,
2080 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
2081 elem_type->u.basic.integer.size,
2082 elem_type->u.basic.integer.alignment,
2083 elem_type->u.basic.integer.signedness,
2084 (elem_type->u.basic.integer.encoding == lttng_encode_none)
2085 ? "none"
2086 : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8)
2087 ? "UTF8"
2088 : "ASCII",
2089 elem_type->u.basic.integer.base,
2090 #if __BYTE_ORDER == __BIG_ENDIAN
2091 elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
2092 #else
2093 elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
2094 #endif
2095 field->name, field->type.u.array.length);
2096 break;
2097 }
2098 case atype_sequence:
2099 case atype_sequence_bitfield:
2100 {
2101 const struct lttng_basic_type *elem_type;
2102 const struct lttng_basic_type *length_type;
2103
2104 elem_type = &field->type.u.sequence.elem_type;
2105 length_type = &field->type.u.sequence.length_type;
2106 ret = print_tabs(session, nesting);
2107 if (ret)
2108 return ret;
2109 ret = lttng_metadata_printf(session,
2110 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
2111 length_type->u.basic.integer.size,
2112 (unsigned int) length_type->u.basic.integer.alignment,
2113 length_type->u.basic.integer.signedness,
2114 (length_type->u.basic.integer.encoding == lttng_encode_none)
2115 ? "none"
2116 : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8)
2117 ? "UTF8"
2118 : "ASCII"),
2119 length_type->u.basic.integer.base,
2120 #if __BYTE_ORDER == __BIG_ENDIAN
2121 length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
2122 #else
2123 length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
2124 #endif
2125 field->name);
2126 if (ret)
2127 return ret;
2128
2129 if (field->type.u.sequence.elem_alignment) {
2130 ret = print_tabs(session, nesting);
2131 if (ret)
2132 return ret;
2133 ret = lttng_metadata_printf(session,
2134 "struct { } align(%u) _%s_padding;\n",
2135 field->type.u.sequence.elem_alignment * CHAR_BIT,
2136 field->name);
2137 if (ret)
2138 return ret;
2139 }
2140 ret = print_tabs(session, nesting);
2141 if (ret)
2142 return ret;
2143 ret = lttng_metadata_printf(session,
2144 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
2145 elem_type->u.basic.integer.size,
2146 (unsigned int) elem_type->u.basic.integer.alignment,
2147 elem_type->u.basic.integer.signedness,
2148 (elem_type->u.basic.integer.encoding == lttng_encode_none)
2149 ? "none"
2150 : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8)
2151 ? "UTF8"
2152 : "ASCII"),
2153 elem_type->u.basic.integer.base,
2154 #if __BYTE_ORDER == __BIG_ENDIAN
2155 elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
2156 #else
2157 elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
2158 #endif
2159 field->name,
2160 field->name);
2161 break;
2162 }
2163
2164 case atype_string:
2165 /* Default encoding is UTF8 */
2166 ret = print_tabs(session, nesting);
2167 if (ret)
2168 return ret;
2169 ret = lttng_metadata_printf(session,
2170 "string%s _%s;\n",
2171 field->type.u.basic.string.encoding == lttng_encode_ASCII ?
2172 " { encoding = ASCII; }" : "",
2173 field->name);
2174 break;
2175 case atype_struct:
2176 ret = _lttng_struct_statedump(session, field, nesting);
2177 break;
2178 case atype_array_compound:
2179 ret = _lttng_array_compound_statedump(session, field, nesting);
2180 break;
2181 case atype_sequence_compound:
2182 ret = _lttng_sequence_compound_statedump(session, field, nesting);
2183 break;
2184 case atype_variant:
2185 ret = _lttng_variant_statedump(session, field, nesting);
2186 break;
2187
2188 default:
2189 WARN_ON_ONCE(1);
2190 return -EINVAL;
2191 }
2192 return ret;
2193 }
2194
2195 static
2196 int _lttng_context_metadata_statedump(struct lttng_session *session,
2197 struct lttng_ctx *ctx)
2198 {
2199 int ret = 0;
2200 int i;
2201
2202 if (!ctx)
2203 return 0;
2204 for (i = 0; i < ctx->nr_fields; i++) {
2205 const struct lttng_ctx_field *field = &ctx->fields[i];
2206
2207 ret = _lttng_field_statedump(session, &field->event_field, 2);
2208 if (ret)
2209 return ret;
2210 }
2211 return ret;
2212 }
2213
2214 static
2215 int _lttng_fields_metadata_statedump(struct lttng_session *session,
2216 struct lttng_event *event)
2217 {
2218 const struct lttng_event_desc *desc = event->desc;
2219 int ret = 0;
2220 int i;
2221
2222 for (i = 0; i < desc->nr_fields; i++) {
2223 const struct lttng_event_field *field = &desc->fields[i];
2224
2225 ret = _lttng_field_statedump(session, field, 2);
2226 if (ret)
2227 return ret;
2228 }
2229 return ret;
2230 }
2231
2232 /*
2233 * Must be called with sessions_mutex held.
2234 */
2235 static
2236 int _lttng_event_metadata_statedump(struct lttng_session *session,
2237 struct lttng_channel *chan,
2238 struct lttng_event *event)
2239 {
2240 int ret = 0;
2241
2242 if (event->metadata_dumped || !READ_ONCE(session->active))
2243 return 0;
2244 if (chan->channel_type == METADATA_CHANNEL)
2245 return 0;
2246
2247 ret = lttng_metadata_printf(session,
2248 "event {\n"
2249 " name = \"%s\";\n"
2250 " id = %u;\n"
2251 " stream_id = %u;\n",
2252 event->desc->name,
2253 event->id,
2254 event->chan->id);
2255 if (ret)
2256 goto end;
2257
2258 if (event->ctx) {
2259 ret = lttng_metadata_printf(session,
2260 " context := struct {\n");
2261 if (ret)
2262 goto end;
2263 }
2264 ret = _lttng_context_metadata_statedump(session, event->ctx);
2265 if (ret)
2266 goto end;
2267 if (event->ctx) {
2268 ret = lttng_metadata_printf(session,
2269 " };\n");
2270 if (ret)
2271 goto end;
2272 }
2273
2274 ret = lttng_metadata_printf(session,
2275 " fields := struct {\n"
2276 );
2277 if (ret)
2278 goto end;
2279
2280 ret = _lttng_fields_metadata_statedump(session, event);
2281 if (ret)
2282 goto end;
2283
2284 /*
2285 * LTTng space reservation can only reserve multiples of the
2286 * byte size.
2287 */
2288 ret = lttng_metadata_printf(session,
2289 " };\n"
2290 "};\n\n");
2291 if (ret)
2292 goto end;
2293
2294 event->metadata_dumped = 1;
2295 end:
2296 return ret;
2297
2298 }
2299
2300 /*
2301 * Must be called with sessions_mutex held.
2302 */
2303 static
2304 int _lttng_channel_metadata_statedump(struct lttng_session *session,
2305 struct lttng_channel *chan)
2306 {
2307 int ret = 0;
2308
2309 if (chan->metadata_dumped || !READ_ONCE(session->active))
2310 return 0;
2311
2312 if (chan->channel_type == METADATA_CHANNEL)
2313 return 0;
2314
2315 WARN_ON_ONCE(!chan->header_type);
2316 ret = lttng_metadata_printf(session,
2317 "stream {\n"
2318 " id = %u;\n"
2319 " event.header := %s;\n"
2320 " packet.context := struct packet_context;\n",
2321 chan->id,
2322 chan->header_type == 1 ? "struct event_header_compact" :
2323 "struct event_header_large");
2324 if (ret)
2325 goto end;
2326
2327 if (chan->ctx) {
2328 ret = lttng_metadata_printf(session,
2329 " event.context := struct {\n");
2330 if (ret)
2331 goto end;
2332 }
2333 ret = _lttng_context_metadata_statedump(session, chan->ctx);
2334 if (ret)
2335 goto end;
2336 if (chan->ctx) {
2337 ret = lttng_metadata_printf(session,
2338 " };\n");
2339 if (ret)
2340 goto end;
2341 }
2342
2343 ret = lttng_metadata_printf(session,
2344 "};\n\n");
2345
2346 chan->metadata_dumped = 1;
2347 end:
2348 return ret;
2349 }
2350
2351 /*
2352 * Must be called with sessions_mutex held.
2353 */
2354 static
2355 int _lttng_stream_packet_context_declare(struct lttng_session *session)
2356 {
2357 return lttng_metadata_printf(session,
2358 "struct packet_context {\n"
2359 " uint64_clock_monotonic_t timestamp_begin;\n"
2360 " uint64_clock_monotonic_t timestamp_end;\n"
2361 " uint64_t content_size;\n"
2362 " uint64_t packet_size;\n"
2363 " uint64_t packet_seq_num;\n"
2364 " unsigned long events_discarded;\n"
2365 " uint32_t cpu_id;\n"
2366 "};\n\n"
2367 );
2368 }
2369
2370 /*
2371 * Compact header:
2372 * id: range: 0 - 30.
2373 * id 31 is reserved to indicate an extended header.
2374 *
2375 * Large header:
2376 * id: range: 0 - 65534.
2377 * id 65535 is reserved to indicate an extended header.
2378 *
2379 * Must be called with sessions_mutex held.
2380 */
2381 static
2382 int _lttng_event_header_declare(struct lttng_session *session)
2383 {
2384 return lttng_metadata_printf(session,
2385 "struct event_header_compact {\n"
2386 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2387 " variant <id> {\n"
2388 " struct {\n"
2389 " uint27_clock_monotonic_t timestamp;\n"
2390 " } compact;\n"
2391 " struct {\n"
2392 " uint32_t id;\n"
2393 " uint64_clock_monotonic_t timestamp;\n"
2394 " } extended;\n"
2395 " } v;\n"
2396 "} align(%u);\n"
2397 "\n"
2398 "struct event_header_large {\n"
2399 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2400 " variant <id> {\n"
2401 " struct {\n"
2402 " uint32_clock_monotonic_t timestamp;\n"
2403 " } compact;\n"
2404 " struct {\n"
2405 " uint32_t id;\n"
2406 " uint64_clock_monotonic_t timestamp;\n"
2407 " } extended;\n"
2408 " } v;\n"
2409 "} align(%u);\n\n",
2410 lttng_alignof(uint32_t) * CHAR_BIT,
2411 lttng_alignof(uint16_t) * CHAR_BIT
2412 );
2413 }
2414
2415 /*
2416 * Approximation of NTP time of day to clock monotonic correlation,
2417 * taken at start of trace.
2418 * Yes, this is only an approximation. Yes, we can (and will) do better
2419 * in future versions.
2420 * This function may return a negative offset. It may happen if the
2421 * system sets the REALTIME clock to 0 after boot.
2422 */
2423 static
2424 int64_t measure_clock_offset(void)
2425 {
2426 uint64_t monotonic_avg, monotonic[2], realtime;
2427 uint64_t tcf = trace_clock_freq();
2428 int64_t offset;
2429 struct timespec rts = { 0, 0 };
2430 unsigned long flags;
2431
2432 /* Disable interrupts to increase correlation precision. */
2433 local_irq_save(flags);
2434 monotonic[0] = trace_clock_read64();
2435 getnstimeofday(&rts);
2436 monotonic[1] = trace_clock_read64();
2437 local_irq_restore(flags);
2438
2439 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2440 realtime = (uint64_t) rts.tv_sec * tcf;
2441 if (tcf == NSEC_PER_SEC) {
2442 realtime += rts.tv_nsec;
2443 } else {
2444 uint64_t n = rts.tv_nsec * tcf;
2445
2446 do_div(n, NSEC_PER_SEC);
2447 realtime += n;
2448 }
2449 offset = (int64_t) realtime - monotonic_avg;
2450 return offset;
2451 }
2452
2453 /*
2454 * Output metadata into this session's metadata buffers.
2455 * Must be called with sessions_mutex held.
2456 */
2457 static
2458 int _lttng_session_metadata_statedump(struct lttng_session *session)
2459 {
2460 unsigned char *uuid_c = session->uuid.b;
2461 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
2462 struct lttng_channel *chan;
2463 struct lttng_event *event;
2464 int ret = 0;
2465
2466 if (!READ_ONCE(session->active))
2467 return 0;
2468 if (session->metadata_dumped)
2469 goto skip_session;
2470
2471 snprintf(uuid_s, sizeof(uuid_s),
2472 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2473 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
2474 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
2475 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
2476 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
2477
2478 ret = lttng_metadata_printf(session,
2479 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2480 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2481 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2482 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
2483 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
2484 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2485 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
2486 "\n"
2487 "trace {\n"
2488 " major = %u;\n"
2489 " minor = %u;\n"
2490 " uuid = \"%s\";\n"
2491 " byte_order = %s;\n"
2492 " packet.header := struct {\n"
2493 " uint32_t magic;\n"
2494 " uint8_t uuid[16];\n"
2495 " uint32_t stream_id;\n"
2496 " uint64_t stream_instance_id;\n"
2497 " };\n"
2498 "};\n\n",
2499 lttng_alignof(uint8_t) * CHAR_BIT,
2500 lttng_alignof(uint16_t) * CHAR_BIT,
2501 lttng_alignof(uint32_t) * CHAR_BIT,
2502 lttng_alignof(uint64_t) * CHAR_BIT,
2503 sizeof(unsigned long) * CHAR_BIT,
2504 lttng_alignof(unsigned long) * CHAR_BIT,
2505 CTF_SPEC_MAJOR,
2506 CTF_SPEC_MINOR,
2507 uuid_s,
2508 #if __BYTE_ORDER == __BIG_ENDIAN
2509 "be"
2510 #else
2511 "le"
2512 #endif
2513 );
2514 if (ret)
2515 goto end;
2516
2517 ret = lttng_metadata_printf(session,
2518 "env {\n"
2519 " hostname = \"%s\";\n"
2520 " domain = \"kernel\";\n"
2521 " sysname = \"%s\";\n"
2522 " kernel_release = \"%s\";\n"
2523 " kernel_version = \"%s\";\n"
2524 " tracer_name = \"lttng-modules\";\n"
2525 " tracer_major = %d;\n"
2526 " tracer_minor = %d;\n"
2527 " tracer_patchlevel = %d;\n"
2528 "};\n\n",
2529 current->nsproxy->uts_ns->name.nodename,
2530 utsname()->sysname,
2531 utsname()->release,
2532 utsname()->version,
2533 LTTNG_MODULES_MAJOR_VERSION,
2534 LTTNG_MODULES_MINOR_VERSION,
2535 LTTNG_MODULES_PATCHLEVEL_VERSION
2536 );
2537 if (ret)
2538 goto end;
2539
2540 ret = lttng_metadata_printf(session,
2541 "clock {\n"
2542 " name = \"%s\";\n",
2543 trace_clock_name()
2544 );
2545 if (ret)
2546 goto end;
2547
2548 if (!trace_clock_uuid(clock_uuid_s)) {
2549 ret = lttng_metadata_printf(session,
2550 " uuid = \"%s\";\n",
2551 clock_uuid_s
2552 );
2553 if (ret)
2554 goto end;
2555 }
2556
2557 ret = lttng_metadata_printf(session,
2558 " description = \"%s\";\n"
2559 " freq = %llu; /* Frequency, in Hz */\n"
2560 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
2561 " offset = %lld;\n"
2562 "};\n\n",
2563 trace_clock_description(),
2564 (unsigned long long) trace_clock_freq(),
2565 (long long) measure_clock_offset()
2566 );
2567 if (ret)
2568 goto end;
2569
2570 ret = lttng_metadata_printf(session,
2571 "typealias integer {\n"
2572 " size = 27; align = 1; signed = false;\n"
2573 " map = clock.%s.value;\n"
2574 "} := uint27_clock_monotonic_t;\n"
2575 "\n"
2576 "typealias integer {\n"
2577 " size = 32; align = %u; signed = false;\n"
2578 " map = clock.%s.value;\n"
2579 "} := uint32_clock_monotonic_t;\n"
2580 "\n"
2581 "typealias integer {\n"
2582 " size = 64; align = %u; signed = false;\n"
2583 " map = clock.%s.value;\n"
2584 "} := uint64_clock_monotonic_t;\n\n",
2585 trace_clock_name(),
2586 lttng_alignof(uint32_t) * CHAR_BIT,
2587 trace_clock_name(),
2588 lttng_alignof(uint64_t) * CHAR_BIT,
2589 trace_clock_name()
2590 );
2591 if (ret)
2592 goto end;
2593
2594 ret = _lttng_stream_packet_context_declare(session);
2595 if (ret)
2596 goto end;
2597
2598 ret = _lttng_event_header_declare(session);
2599 if (ret)
2600 goto end;
2601
2602 skip_session:
2603 list_for_each_entry(chan, &session->chan, list) {
2604 ret = _lttng_channel_metadata_statedump(session, chan);
2605 if (ret)
2606 goto end;
2607 }
2608
2609 list_for_each_entry(event, &session->events, list) {
2610 ret = _lttng_event_metadata_statedump(session, event->chan, event);
2611 if (ret)
2612 goto end;
2613 }
2614 session->metadata_dumped = 1;
2615 end:
2616 return ret;
2617 }
2618
2619 /**
2620 * lttng_transport_register - LTT transport registration
2621 * @transport: transport structure
2622 *
2623 * Registers a transport which can be used as output to extract the data out of
2624 * LTTng. The module calling this registration function must ensure that no
2625 * trap-inducing code will be executed by the transport functions. E.g.
2626 * vmalloc_sync_all() must be called between a vmalloc and the moment the memory
2627 * is made visible to the transport function. This registration acts as a
2628 * vmalloc_sync_all. Therefore, only if the module allocates virtual memory
2629 * after its registration must it synchronize the TLBs.
2630 */
2631 void lttng_transport_register(struct lttng_transport *transport)
2632 {
2633 /*
2634 * Make sure no page fault can be triggered by the module about to be
2635 * registered. We deal with this here so we don't have to call
2636 * vmalloc_sync_all() in each module's init.
2637 */
2638 wrapper_vmalloc_sync_all();
2639
2640 mutex_lock(&sessions_mutex);
2641 list_add_tail(&transport->node, &lttng_transport_list);
2642 mutex_unlock(&sessions_mutex);
2643 }
2644 EXPORT_SYMBOL_GPL(lttng_transport_register);
2645
2646 /**
2647 * lttng_transport_unregister - LTT transport unregistration
2648 * @transport: transport structure
2649 */
2650 void lttng_transport_unregister(struct lttng_transport *transport)
2651 {
2652 mutex_lock(&sessions_mutex);
2653 list_del(&transport->node);
2654 mutex_unlock(&sessions_mutex);
2655 }
2656 EXPORT_SYMBOL_GPL(lttng_transport_unregister);
2657
2658 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
2659
2660 enum cpuhp_state lttng_hp_prepare;
2661 enum cpuhp_state lttng_hp_online;
2662
2663 static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
2664 {
2665 struct lttng_cpuhp_node *lttng_node;
2666
2667 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2668 switch (lttng_node->component) {
2669 case LTTNG_RING_BUFFER_FRONTEND:
2670 return 0;
2671 case LTTNG_RING_BUFFER_BACKEND:
2672 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
2673 case LTTNG_RING_BUFFER_ITER:
2674 return 0;
2675 case LTTNG_CONTEXT_PERF_COUNTERS:
2676 return 0;
2677 default:
2678 return -EINVAL;
2679 }
2680 }
2681
2682 static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
2683 {
2684 struct lttng_cpuhp_node *lttng_node;
2685
2686 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2687 switch (lttng_node->component) {
2688 case LTTNG_RING_BUFFER_FRONTEND:
2689 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
2690 case LTTNG_RING_BUFFER_BACKEND:
2691 return 0;
2692 case LTTNG_RING_BUFFER_ITER:
2693 return 0;
2694 case LTTNG_CONTEXT_PERF_COUNTERS:
2695 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
2696 default:
2697 return -EINVAL;
2698 }
2699 }
2700
2701 static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
2702 {
2703 struct lttng_cpuhp_node *lttng_node;
2704
2705 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2706 switch (lttng_node->component) {
2707 case LTTNG_RING_BUFFER_FRONTEND:
2708 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
2709 case LTTNG_RING_BUFFER_BACKEND:
2710 return 0;
2711 case LTTNG_RING_BUFFER_ITER:
2712 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
2713 case LTTNG_CONTEXT_PERF_COUNTERS:
2714 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
2715 default:
2716 return -EINVAL;
2717 }
2718 }
2719
2720 static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
2721 {
2722 struct lttng_cpuhp_node *lttng_node;
2723
2724 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2725 switch (lttng_node->component) {
2726 case LTTNG_RING_BUFFER_FRONTEND:
2727 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
2728 case LTTNG_RING_BUFFER_BACKEND:
2729 return 0;
2730 case LTTNG_RING_BUFFER_ITER:
2731 return 0;
2732 case LTTNG_CONTEXT_PERF_COUNTERS:
2733 return 0;
2734 default:
2735 return -EINVAL;
2736 }
2737 }
2738
2739 static int __init lttng_init_cpu_hotplug(void)
2740 {
2741 int ret;
2742
2743 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
2744 lttng_hotplug_prepare,
2745 lttng_hotplug_dead);
2746 if (ret < 0) {
2747 return ret;
2748 }
2749 lttng_hp_prepare = ret;
2750 lttng_rb_set_hp_prepare(ret);
2751
2752 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
2753 lttng_hotplug_online,
2754 lttng_hotplug_offline);
2755 if (ret < 0) {
2756 cpuhp_remove_multi_state(lttng_hp_prepare);
2757 lttng_hp_prepare = 0;
2758 return ret;
2759 }
2760 lttng_hp_online = ret;
2761 lttng_rb_set_hp_online(ret);
2762
2763 return 0;
2764 }
2765
2766 static void __exit lttng_exit_cpu_hotplug(void)
2767 {
2768 lttng_rb_set_hp_online(0);
2769 cpuhp_remove_multi_state(lttng_hp_online);
2770 lttng_rb_set_hp_prepare(0);
2771 cpuhp_remove_multi_state(lttng_hp_prepare);
2772 }
2773
2774 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2775 static int lttng_init_cpu_hotplug(void)
2776 {
2777 return 0;
2778 }
2779 static void lttng_exit_cpu_hotplug(void)
2780 {
2781 }
2782 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2783
2784
2785 static int __init lttng_events_init(void)
2786 {
2787 int ret;
2788
2789 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
2790 if (ret)
2791 return ret;
2792 ret = wrapper_get_pfnblock_flags_mask_init();
2793 if (ret)
2794 return ret;
2795 ret = wrapper_get_pageblock_flags_mask_init();
2796 if (ret)
2797 return ret;
2798 ret = lttng_probes_init();
2799 if (ret)
2800 return ret;
2801 ret = lttng_context_init();
2802 if (ret)
2803 return ret;
2804 ret = lttng_tracepoint_init();
2805 if (ret)
2806 goto error_tp;
2807 event_cache = KMEM_CACHE(lttng_event, 0);
2808 if (!event_cache) {
2809 ret = -ENOMEM;
2810 goto error_kmem;
2811 }
2812 ret = lttng_abi_init();
2813 if (ret)
2814 goto error_abi;
2815 ret = lttng_logger_init();
2816 if (ret)
2817 goto error_logger;
2818 ret = lttng_init_cpu_hotplug();
2819 if (ret)
2820 goto error_hotplug;
2821 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
2822 __stringify(LTTNG_MODULES_MAJOR_VERSION),
2823 __stringify(LTTNG_MODULES_MINOR_VERSION),
2824 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
2825 LTTNG_MODULES_EXTRAVERSION,
2826 LTTNG_VERSION_NAME,
2827 #ifdef LTTNG_EXTRA_VERSION_GIT
2828 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
2829 #else
2830 "",
2831 #endif
2832 #ifdef LTTNG_EXTRA_VERSION_NAME
2833 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
2834 #else
2835 "");
2836 #endif
2837 return 0;
2838
2839 error_hotplug:
2840 lttng_logger_exit();
2841 error_logger:
2842 lttng_abi_exit();
2843 error_abi:
2844 kmem_cache_destroy(event_cache);
2845 error_kmem:
2846 lttng_tracepoint_exit();
2847 error_tp:
2848 lttng_context_exit();
2849 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
2850 __stringify(LTTNG_MODULES_MAJOR_VERSION),
2851 __stringify(LTTNG_MODULES_MINOR_VERSION),
2852 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
2853 LTTNG_MODULES_EXTRAVERSION,
2854 LTTNG_VERSION_NAME,
2855 #ifdef LTTNG_EXTRA_VERSION_GIT
2856 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
2857 #else
2858 "",
2859 #endif
2860 #ifdef LTTNG_EXTRA_VERSION_NAME
2861 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
2862 #else
2863 "");
2864 #endif
2865 return ret;
2866 }
2867
2868 module_init(lttng_events_init);
2869
2870 static void __exit lttng_events_exit(void)
2871 {
2872 struct lttng_session *session, *tmpsession;
2873
2874 lttng_exit_cpu_hotplug();
2875 lttng_logger_exit();
2876 lttng_abi_exit();
2877 list_for_each_entry_safe(session, tmpsession, &sessions, list)
2878 lttng_session_destroy(session);
2879 kmem_cache_destroy(event_cache);
2880 lttng_tracepoint_exit();
2881 lttng_context_exit();
2882 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
2883 __stringify(LTTNG_MODULES_MAJOR_VERSION),
2884 __stringify(LTTNG_MODULES_MINOR_VERSION),
2885 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
2886 LTTNG_MODULES_EXTRAVERSION,
2887 LTTNG_VERSION_NAME,
2888 #ifdef LTTNG_EXTRA_VERSION_GIT
2889 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
2890 #else
2891 "",
2892 #endif
2893 #ifdef LTTNG_EXTRA_VERSION_NAME
2894 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
2895 #else
2896 "");
2897 #endif
2898 }
2899
2900 module_exit(lttng_events_exit);
2901
2902 #include "extra_version/patches.i"
2903 #ifdef LTTNG_EXTRA_VERSION_GIT
2904 MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
2905 #endif
2906 #ifdef LTTNG_EXTRA_VERSION_NAME
2907 MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
2908 #endif
2909 MODULE_LICENSE("GPL and additional rights");
2910 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
2911 MODULE_DESCRIPTION("LTTng tracer");
2912 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
2913 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
2914 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
2915 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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