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metadata: Add the product uuid to the 'env' section
[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 #include <linux/uuid.h>
31 #include <linux/dmi.h>
32
33 #include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */
34 #include <wrapper/random.h>
35 #include <wrapper/tracepoint.h>
36 #include <wrapper/list.h>
37 #include <wrapper/types.h>
38 #include <lttng-kernel-version.h>
39 #include <lttng-events.h>
40 #include <lttng-tracer.h>
41 #include <lttng-abi-old.h>
42 #include <lttng-endian.h>
43 #include <lttng-string-utils.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 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
80 synchronize_rcu();
81 #else
82 synchronize_sched();
83 #endif
84
85 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
86 #ifdef CONFIG_PREEMPT_RT_FULL
87 synchronize_rcu();
88 #endif
89 #else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
90 #ifdef CONFIG_PREEMPT_RT
91 synchronize_rcu();
92 #endif
93 #endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */
94 }
95
96 void lttng_lock_sessions(void)
97 {
98 mutex_lock(&sessions_mutex);
99 }
100
101 void lttng_unlock_sessions(void)
102 {
103 mutex_unlock(&sessions_mutex);
104 }
105
106 /*
107 * Called with sessions lock held.
108 */
109 int lttng_session_active(void)
110 {
111 struct lttng_session *iter;
112
113 list_for_each_entry(iter, &sessions, list) {
114 if (iter->active)
115 return 1;
116 }
117 return 0;
118 }
119
120 struct lttng_session *lttng_session_create(void)
121 {
122 struct lttng_session *session;
123 struct lttng_metadata_cache *metadata_cache;
124 int i;
125
126 mutex_lock(&sessions_mutex);
127 session = lttng_kvzalloc(sizeof(struct lttng_session), GFP_KERNEL);
128 if (!session)
129 goto err;
130 INIT_LIST_HEAD(&session->chan);
131 INIT_LIST_HEAD(&session->events);
132 uuid_le_gen(&session->uuid);
133
134 metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
135 GFP_KERNEL);
136 if (!metadata_cache)
137 goto err_free_session;
138 metadata_cache->data = vzalloc(METADATA_CACHE_DEFAULT_SIZE);
139 if (!metadata_cache->data)
140 goto err_free_cache;
141 metadata_cache->cache_alloc = METADATA_CACHE_DEFAULT_SIZE;
142 kref_init(&metadata_cache->refcount);
143 mutex_init(&metadata_cache->lock);
144 session->metadata_cache = metadata_cache;
145 INIT_LIST_HEAD(&metadata_cache->metadata_stream);
146 memcpy(&metadata_cache->uuid, &session->uuid,
147 sizeof(metadata_cache->uuid));
148 INIT_LIST_HEAD(&session->enablers_head);
149 for (i = 0; i < LTTNG_EVENT_HT_SIZE; i++)
150 INIT_HLIST_HEAD(&session->events_ht.table[i]);
151 list_add(&session->list, &sessions);
152 mutex_unlock(&sessions_mutex);
153 return session;
154
155 err_free_cache:
156 kfree(metadata_cache);
157 err_free_session:
158 lttng_kvfree(session);
159 err:
160 mutex_unlock(&sessions_mutex);
161 return NULL;
162 }
163
164 void metadata_cache_destroy(struct kref *kref)
165 {
166 struct lttng_metadata_cache *cache =
167 container_of(kref, struct lttng_metadata_cache, refcount);
168 vfree(cache->data);
169 kfree(cache);
170 }
171
172 void lttng_session_destroy(struct lttng_session *session)
173 {
174 struct lttng_channel *chan, *tmpchan;
175 struct lttng_event *event, *tmpevent;
176 struct lttng_metadata_stream *metadata_stream;
177 struct lttng_enabler *enabler, *tmpenabler;
178 int ret;
179
180 mutex_lock(&sessions_mutex);
181 WRITE_ONCE(session->active, 0);
182 list_for_each_entry(chan, &session->chan, list) {
183 ret = lttng_syscalls_unregister(chan);
184 WARN_ON(ret);
185 }
186 list_for_each_entry(event, &session->events, list) {
187 ret = _lttng_event_unregister(event);
188 WARN_ON(ret);
189 }
190 synchronize_trace(); /* Wait for in-flight events to complete */
191 list_for_each_entry_safe(enabler, tmpenabler,
192 &session->enablers_head, node)
193 lttng_enabler_destroy(enabler);
194 list_for_each_entry_safe(event, tmpevent, &session->events, list)
195 _lttng_event_destroy(event);
196 list_for_each_entry_safe(chan, tmpchan, &session->chan, list) {
197 BUG_ON(chan->channel_type == METADATA_CHANNEL);
198 _lttng_channel_destroy(chan);
199 }
200 list_for_each_entry(metadata_stream, &session->metadata_cache->metadata_stream, list)
201 _lttng_metadata_channel_hangup(metadata_stream);
202 if (session->pid_tracker)
203 lttng_pid_tracker_destroy(session->pid_tracker);
204 kref_put(&session->metadata_cache->refcount, metadata_cache_destroy);
205 list_del(&session->list);
206 mutex_unlock(&sessions_mutex);
207 lttng_kvfree(session);
208 }
209
210 int lttng_session_statedump(struct lttng_session *session)
211 {
212 int ret;
213
214 mutex_lock(&sessions_mutex);
215 ret = lttng_statedump_start(session);
216 mutex_unlock(&sessions_mutex);
217 return ret;
218 }
219
220 int lttng_session_enable(struct lttng_session *session)
221 {
222 int ret = 0;
223 struct lttng_channel *chan;
224
225 mutex_lock(&sessions_mutex);
226 if (session->active) {
227 ret = -EBUSY;
228 goto end;
229 }
230
231 /* Set transient enabler state to "enabled" */
232 session->tstate = 1;
233
234 /* We need to sync enablers with session before activation. */
235 lttng_session_sync_enablers(session);
236
237 /*
238 * Snapshot the number of events per channel to know the type of header
239 * we need to use.
240 */
241 list_for_each_entry(chan, &session->chan, list) {
242 if (chan->header_type)
243 continue; /* don't change it if session stop/restart */
244 if (chan->free_event_id < 31)
245 chan->header_type = 1; /* compact */
246 else
247 chan->header_type = 2; /* large */
248 }
249
250 /* Clear each stream's quiescent state. */
251 list_for_each_entry(chan, &session->chan, list) {
252 if (chan->channel_type != METADATA_CHANNEL)
253 lib_ring_buffer_clear_quiescent_channel(chan->chan);
254 }
255
256 WRITE_ONCE(session->active, 1);
257 WRITE_ONCE(session->been_active, 1);
258 ret = _lttng_session_metadata_statedump(session);
259 if (ret) {
260 WRITE_ONCE(session->active, 0);
261 goto end;
262 }
263 ret = lttng_statedump_start(session);
264 if (ret)
265 WRITE_ONCE(session->active, 0);
266 end:
267 mutex_unlock(&sessions_mutex);
268 return ret;
269 }
270
271 int lttng_session_disable(struct lttng_session *session)
272 {
273 int ret = 0;
274 struct lttng_channel *chan;
275
276 mutex_lock(&sessions_mutex);
277 if (!session->active) {
278 ret = -EBUSY;
279 goto end;
280 }
281 WRITE_ONCE(session->active, 0);
282
283 /* Set transient enabler state to "disabled" */
284 session->tstate = 0;
285 lttng_session_sync_enablers(session);
286
287 /* Set each stream's quiescent state. */
288 list_for_each_entry(chan, &session->chan, list) {
289 if (chan->channel_type != METADATA_CHANNEL)
290 lib_ring_buffer_set_quiescent_channel(chan->chan);
291 }
292 end:
293 mutex_unlock(&sessions_mutex);
294 return ret;
295 }
296
297 int lttng_session_metadata_regenerate(struct lttng_session *session)
298 {
299 int ret = 0;
300 struct lttng_channel *chan;
301 struct lttng_event *event;
302 struct lttng_metadata_cache *cache = session->metadata_cache;
303 struct lttng_metadata_stream *stream;
304
305 mutex_lock(&sessions_mutex);
306 if (!session->active) {
307 ret = -EBUSY;
308 goto end;
309 }
310
311 mutex_lock(&cache->lock);
312 memset(cache->data, 0, cache->cache_alloc);
313 cache->metadata_written = 0;
314 cache->version++;
315 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list) {
316 stream->metadata_out = 0;
317 stream->metadata_in = 0;
318 }
319 mutex_unlock(&cache->lock);
320
321 session->metadata_dumped = 0;
322 list_for_each_entry(chan, &session->chan, list) {
323 chan->metadata_dumped = 0;
324 }
325
326 list_for_each_entry(event, &session->events, list) {
327 event->metadata_dumped = 0;
328 }
329
330 ret = _lttng_session_metadata_statedump(session);
331
332 end:
333 mutex_unlock(&sessions_mutex);
334 return ret;
335 }
336
337 int lttng_channel_enable(struct lttng_channel *channel)
338 {
339 int ret = 0;
340
341 mutex_lock(&sessions_mutex);
342 if (channel->channel_type == METADATA_CHANNEL) {
343 ret = -EPERM;
344 goto end;
345 }
346 if (channel->enabled) {
347 ret = -EEXIST;
348 goto end;
349 }
350 /* Set transient enabler state to "enabled" */
351 channel->tstate = 1;
352 lttng_session_sync_enablers(channel->session);
353 /* Set atomically the state to "enabled" */
354 WRITE_ONCE(channel->enabled, 1);
355 end:
356 mutex_unlock(&sessions_mutex);
357 return ret;
358 }
359
360 int lttng_channel_disable(struct lttng_channel *channel)
361 {
362 int ret = 0;
363
364 mutex_lock(&sessions_mutex);
365 if (channel->channel_type == METADATA_CHANNEL) {
366 ret = -EPERM;
367 goto end;
368 }
369 if (!channel->enabled) {
370 ret = -EEXIST;
371 goto end;
372 }
373 /* Set atomically the state to "disabled" */
374 WRITE_ONCE(channel->enabled, 0);
375 /* Set transient enabler state to "enabled" */
376 channel->tstate = 0;
377 lttng_session_sync_enablers(channel->session);
378 end:
379 mutex_unlock(&sessions_mutex);
380 return ret;
381 }
382
383 int lttng_event_enable(struct lttng_event *event)
384 {
385 int ret = 0;
386
387 mutex_lock(&sessions_mutex);
388 if (event->chan->channel_type == METADATA_CHANNEL) {
389 ret = -EPERM;
390 goto end;
391 }
392 if (event->enabled) {
393 ret = -EEXIST;
394 goto end;
395 }
396 switch (event->instrumentation) {
397 case LTTNG_KERNEL_TRACEPOINT:
398 case LTTNG_KERNEL_SYSCALL:
399 ret = -EINVAL;
400 break;
401 case LTTNG_KERNEL_KPROBE:
402 case LTTNG_KERNEL_FUNCTION:
403 case LTTNG_KERNEL_UPROBE:
404 case LTTNG_KERNEL_NOOP:
405 WRITE_ONCE(event->enabled, 1);
406 break;
407 case LTTNG_KERNEL_KRETPROBE:
408 ret = lttng_kretprobes_event_enable_state(event, 1);
409 break;
410 default:
411 WARN_ON_ONCE(1);
412 ret = -EINVAL;
413 }
414 end:
415 mutex_unlock(&sessions_mutex);
416 return ret;
417 }
418
419 int lttng_event_disable(struct lttng_event *event)
420 {
421 int ret = 0;
422
423 mutex_lock(&sessions_mutex);
424 if (event->chan->channel_type == METADATA_CHANNEL) {
425 ret = -EPERM;
426 goto end;
427 }
428 if (!event->enabled) {
429 ret = -EEXIST;
430 goto end;
431 }
432 switch (event->instrumentation) {
433 case LTTNG_KERNEL_TRACEPOINT:
434 case LTTNG_KERNEL_SYSCALL:
435 ret = -EINVAL;
436 break;
437 case LTTNG_KERNEL_KPROBE:
438 case LTTNG_KERNEL_FUNCTION:
439 case LTTNG_KERNEL_UPROBE:
440 case LTTNG_KERNEL_NOOP:
441 WRITE_ONCE(event->enabled, 0);
442 break;
443 case LTTNG_KERNEL_KRETPROBE:
444 ret = lttng_kretprobes_event_enable_state(event, 0);
445 break;
446 default:
447 WARN_ON_ONCE(1);
448 ret = -EINVAL;
449 }
450 end:
451 mutex_unlock(&sessions_mutex);
452 return ret;
453 }
454
455 static struct lttng_transport *lttng_transport_find(const char *name)
456 {
457 struct lttng_transport *transport;
458
459 list_for_each_entry(transport, &lttng_transport_list, node) {
460 if (!strcmp(transport->name, name))
461 return transport;
462 }
463 return NULL;
464 }
465
466 struct lttng_channel *lttng_channel_create(struct lttng_session *session,
467 const char *transport_name,
468 void *buf_addr,
469 size_t subbuf_size, size_t num_subbuf,
470 unsigned int switch_timer_interval,
471 unsigned int read_timer_interval,
472 enum channel_type channel_type)
473 {
474 struct lttng_channel *chan;
475 struct lttng_transport *transport = NULL;
476
477 mutex_lock(&sessions_mutex);
478 if (session->been_active && channel_type != METADATA_CHANNEL)
479 goto active; /* Refuse to add channel to active session */
480 transport = lttng_transport_find(transport_name);
481 if (!transport) {
482 printk(KERN_WARNING "LTTng transport %s not found\n",
483 transport_name);
484 goto notransport;
485 }
486 if (!try_module_get(transport->owner)) {
487 printk(KERN_WARNING "LTT : Can't lock transport module.\n");
488 goto notransport;
489 }
490 chan = kzalloc(sizeof(struct lttng_channel), GFP_KERNEL);
491 if (!chan)
492 goto nomem;
493 chan->session = session;
494 chan->id = session->free_chan_id++;
495 chan->ops = &transport->ops;
496 /*
497 * Note: the channel creation op already writes into the packet
498 * headers. Therefore the "chan" information used as input
499 * should be already accessible.
500 */
501 chan->chan = transport->ops.channel_create(transport_name,
502 chan, buf_addr, subbuf_size, num_subbuf,
503 switch_timer_interval, read_timer_interval);
504 if (!chan->chan)
505 goto create_error;
506 chan->tstate = 1;
507 chan->enabled = 1;
508 chan->transport = transport;
509 chan->channel_type = channel_type;
510 list_add(&chan->list, &session->chan);
511 mutex_unlock(&sessions_mutex);
512 return chan;
513
514 create_error:
515 kfree(chan);
516 nomem:
517 if (transport)
518 module_put(transport->owner);
519 notransport:
520 active:
521 mutex_unlock(&sessions_mutex);
522 return NULL;
523 }
524
525 /*
526 * Only used internally at session destruction for per-cpu channels, and
527 * when metadata channel is released.
528 * Needs to be called with sessions mutex held.
529 */
530 static
531 void _lttng_channel_destroy(struct lttng_channel *chan)
532 {
533 chan->ops->channel_destroy(chan->chan);
534 module_put(chan->transport->owner);
535 list_del(&chan->list);
536 lttng_destroy_context(chan->ctx);
537 kfree(chan);
538 }
539
540 void lttng_metadata_channel_destroy(struct lttng_channel *chan)
541 {
542 BUG_ON(chan->channel_type != METADATA_CHANNEL);
543
544 /* Protect the metadata cache with the sessions_mutex. */
545 mutex_lock(&sessions_mutex);
546 _lttng_channel_destroy(chan);
547 mutex_unlock(&sessions_mutex);
548 }
549 EXPORT_SYMBOL_GPL(lttng_metadata_channel_destroy);
550
551 static
552 void _lttng_metadata_channel_hangup(struct lttng_metadata_stream *stream)
553 {
554 stream->finalized = 1;
555 wake_up_interruptible(&stream->read_wait);
556 }
557
558 /*
559 * Supports event creation while tracing session is active.
560 * Needs to be called with sessions mutex held.
561 */
562 struct lttng_event *_lttng_event_create(struct lttng_channel *chan,
563 struct lttng_kernel_event *event_param,
564 void *filter,
565 const struct lttng_event_desc *event_desc,
566 enum lttng_kernel_instrumentation itype)
567 {
568 struct lttng_session *session = chan->session;
569 struct lttng_event *event;
570 const char *event_name;
571 struct hlist_head *head;
572 size_t name_len;
573 uint32_t hash;
574 int ret;
575
576 if (chan->free_event_id == -1U) {
577 ret = -EMFILE;
578 goto full;
579 }
580
581 switch (itype) {
582 case LTTNG_KERNEL_TRACEPOINT:
583 event_name = event_desc->name;
584 break;
585 case LTTNG_KERNEL_KPROBE:
586 case LTTNG_KERNEL_UPROBE:
587 case LTTNG_KERNEL_KRETPROBE:
588 case LTTNG_KERNEL_FUNCTION:
589 case LTTNG_KERNEL_NOOP:
590 case LTTNG_KERNEL_SYSCALL:
591 event_name = event_param->name;
592 break;
593 default:
594 WARN_ON_ONCE(1);
595 ret = -EINVAL;
596 goto type_error;
597 }
598 name_len = strlen(event_name);
599 hash = jhash(event_name, name_len, 0);
600 head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)];
601 lttng_hlist_for_each_entry(event, head, hlist) {
602 WARN_ON_ONCE(!event->desc);
603 if (!strncmp(event->desc->name, event_name,
604 LTTNG_KERNEL_SYM_NAME_LEN - 1)
605 && chan == event->chan) {
606 ret = -EEXIST;
607 goto exist;
608 }
609 }
610
611 event = kmem_cache_zalloc(event_cache, GFP_KERNEL);
612 if (!event) {
613 ret = -ENOMEM;
614 goto cache_error;
615 }
616 event->chan = chan;
617 event->filter = filter;
618 event->id = chan->free_event_id++;
619 event->instrumentation = itype;
620 event->evtype = LTTNG_TYPE_EVENT;
621 INIT_LIST_HEAD(&event->bytecode_runtime_head);
622 INIT_LIST_HEAD(&event->enablers_ref_head);
623
624 switch (itype) {
625 case LTTNG_KERNEL_TRACEPOINT:
626 /* Event will be enabled by enabler sync. */
627 event->enabled = 0;
628 event->registered = 0;
629 event->desc = lttng_event_get(event_name);
630 if (!event->desc) {
631 ret = -ENOENT;
632 goto register_error;
633 }
634 /* Populate lttng_event structure before event registration. */
635 smp_wmb();
636 break;
637 case LTTNG_KERNEL_KPROBE:
638 /*
639 * Needs to be explicitly enabled after creation, since
640 * we may want to apply filters.
641 */
642 event->enabled = 0;
643 event->registered = 1;
644 /*
645 * Populate lttng_event structure before event
646 * registration.
647 */
648 smp_wmb();
649 ret = lttng_kprobes_register(event_name,
650 event_param->u.kprobe.symbol_name,
651 event_param->u.kprobe.offset,
652 event_param->u.kprobe.addr,
653 event);
654 if (ret) {
655 ret = -EINVAL;
656 goto register_error;
657 }
658 ret = try_module_get(event->desc->owner);
659 WARN_ON_ONCE(!ret);
660 break;
661 case LTTNG_KERNEL_KRETPROBE:
662 {
663 struct lttng_event *event_return;
664
665 /* kretprobe defines 2 events */
666 /*
667 * Needs to be explicitly enabled after creation, since
668 * we may want to apply filters.
669 */
670 event->enabled = 0;
671 event->registered = 1;
672 event_return =
673 kmem_cache_zalloc(event_cache, GFP_KERNEL);
674 if (!event_return) {
675 ret = -ENOMEM;
676 goto register_error;
677 }
678 event_return->chan = chan;
679 event_return->filter = filter;
680 event_return->id = chan->free_event_id++;
681 event_return->enabled = 0;
682 event_return->registered = 1;
683 event_return->instrumentation = itype;
684 /*
685 * Populate lttng_event structure before kretprobe registration.
686 */
687 smp_wmb();
688 ret = lttng_kretprobes_register(event_name,
689 event_param->u.kretprobe.symbol_name,
690 event_param->u.kretprobe.offset,
691 event_param->u.kretprobe.addr,
692 event, event_return);
693 if (ret) {
694 kmem_cache_free(event_cache, event_return);
695 ret = -EINVAL;
696 goto register_error;
697 }
698 /* Take 2 refs on the module: one per event. */
699 ret = try_module_get(event->desc->owner);
700 WARN_ON_ONCE(!ret);
701 ret = try_module_get(event->desc->owner);
702 WARN_ON_ONCE(!ret);
703 ret = _lttng_event_metadata_statedump(chan->session, chan,
704 event_return);
705 WARN_ON_ONCE(ret > 0);
706 if (ret) {
707 kmem_cache_free(event_cache, event_return);
708 module_put(event->desc->owner);
709 module_put(event->desc->owner);
710 goto statedump_error;
711 }
712 list_add(&event_return->list, &chan->session->events);
713 break;
714 }
715 case LTTNG_KERNEL_FUNCTION:
716 /*
717 * Needs to be explicitly enabled after creation, since
718 * we may want to apply filters.
719 */
720 event->enabled = 0;
721 event->registered = 1;
722 /*
723 * Populate lttng_event structure before event
724 * registration.
725 */
726 smp_wmb();
727 ret = lttng_ftrace_register(event_name,
728 event_param->u.ftrace.symbol_name,
729 event);
730 if (ret) {
731 goto register_error;
732 }
733 ret = try_module_get(event->desc->owner);
734 WARN_ON_ONCE(!ret);
735 break;
736 case LTTNG_KERNEL_NOOP:
737 case LTTNG_KERNEL_SYSCALL:
738 /*
739 * Needs to be explicitly enabled after creation, since
740 * we may want to apply filters.
741 */
742 event->enabled = 0;
743 event->registered = 0;
744 event->desc = event_desc;
745 if (!event->desc) {
746 ret = -EINVAL;
747 goto register_error;
748 }
749 break;
750 case LTTNG_KERNEL_UPROBE:
751 /*
752 * Needs to be explicitly enabled after creation, since
753 * we may want to apply filters.
754 */
755 event->enabled = 0;
756 event->registered = 1;
757
758 /*
759 * Populate lttng_event structure before event
760 * registration.
761 */
762 smp_wmb();
763
764 ret = lttng_uprobes_register(event_param->name,
765 event_param->u.uprobe.fd,
766 event);
767 if (ret)
768 goto register_error;
769 ret = try_module_get(event->desc->owner);
770 WARN_ON_ONCE(!ret);
771 break;
772 default:
773 WARN_ON_ONCE(1);
774 ret = -EINVAL;
775 goto register_error;
776 }
777 ret = _lttng_event_metadata_statedump(chan->session, chan, event);
778 WARN_ON_ONCE(ret > 0);
779 if (ret) {
780 goto statedump_error;
781 }
782 hlist_add_head(&event->hlist, head);
783 list_add(&event->list, &chan->session->events);
784 return event;
785
786 statedump_error:
787 /* If a statedump error occurs, events will not be readable. */
788 register_error:
789 kmem_cache_free(event_cache, event);
790 cache_error:
791 exist:
792 type_error:
793 full:
794 return ERR_PTR(ret);
795 }
796
797 struct lttng_event *lttng_event_create(struct lttng_channel *chan,
798 struct lttng_kernel_event *event_param,
799 void *filter,
800 const struct lttng_event_desc *event_desc,
801 enum lttng_kernel_instrumentation itype)
802 {
803 struct lttng_event *event;
804
805 mutex_lock(&sessions_mutex);
806 event = _lttng_event_create(chan, event_param, filter, event_desc,
807 itype);
808 mutex_unlock(&sessions_mutex);
809 return event;
810 }
811
812 /* Only used for tracepoints for now. */
813 static
814 void register_event(struct lttng_event *event)
815 {
816 const struct lttng_event_desc *desc;
817 int ret = -EINVAL;
818
819 if (event->registered)
820 return;
821
822 desc = event->desc;
823 switch (event->instrumentation) {
824 case LTTNG_KERNEL_TRACEPOINT:
825 ret = lttng_wrapper_tracepoint_probe_register(desc->kname,
826 desc->probe_callback,
827 event);
828 break;
829 case LTTNG_KERNEL_SYSCALL:
830 ret = lttng_syscall_filter_enable(event->chan,
831 desc->name);
832 break;
833 case LTTNG_KERNEL_KPROBE:
834 case LTTNG_KERNEL_UPROBE:
835 case LTTNG_KERNEL_KRETPROBE:
836 case LTTNG_KERNEL_FUNCTION:
837 case LTTNG_KERNEL_NOOP:
838 ret = 0;
839 break;
840 default:
841 WARN_ON_ONCE(1);
842 }
843 if (!ret)
844 event->registered = 1;
845 }
846
847 /*
848 * Only used internally at session destruction.
849 */
850 int _lttng_event_unregister(struct lttng_event *event)
851 {
852 const struct lttng_event_desc *desc;
853 int ret = -EINVAL;
854
855 if (!event->registered)
856 return 0;
857
858 desc = event->desc;
859 switch (event->instrumentation) {
860 case LTTNG_KERNEL_TRACEPOINT:
861 ret = lttng_wrapper_tracepoint_probe_unregister(event->desc->kname,
862 event->desc->probe_callback,
863 event);
864 break;
865 case LTTNG_KERNEL_KPROBE:
866 lttng_kprobes_unregister(event);
867 ret = 0;
868 break;
869 case LTTNG_KERNEL_KRETPROBE:
870 lttng_kretprobes_unregister(event);
871 ret = 0;
872 break;
873 case LTTNG_KERNEL_FUNCTION:
874 lttng_ftrace_unregister(event);
875 ret = 0;
876 break;
877 case LTTNG_KERNEL_SYSCALL:
878 ret = lttng_syscall_filter_disable(event->chan,
879 desc->name);
880 break;
881 case LTTNG_KERNEL_NOOP:
882 ret = 0;
883 break;
884 case LTTNG_KERNEL_UPROBE:
885 lttng_uprobes_unregister(event);
886 ret = 0;
887 break;
888 default:
889 WARN_ON_ONCE(1);
890 }
891 if (!ret)
892 event->registered = 0;
893 return ret;
894 }
895
896 /*
897 * Only used internally at session destruction.
898 */
899 static
900 void _lttng_event_destroy(struct lttng_event *event)
901 {
902 switch (event->instrumentation) {
903 case LTTNG_KERNEL_TRACEPOINT:
904 lttng_event_put(event->desc);
905 break;
906 case LTTNG_KERNEL_KPROBE:
907 module_put(event->desc->owner);
908 lttng_kprobes_destroy_private(event);
909 break;
910 case LTTNG_KERNEL_KRETPROBE:
911 module_put(event->desc->owner);
912 lttng_kretprobes_destroy_private(event);
913 break;
914 case LTTNG_KERNEL_FUNCTION:
915 module_put(event->desc->owner);
916 lttng_ftrace_destroy_private(event);
917 break;
918 case LTTNG_KERNEL_NOOP:
919 case LTTNG_KERNEL_SYSCALL:
920 break;
921 case LTTNG_KERNEL_UPROBE:
922 module_put(event->desc->owner);
923 lttng_uprobes_destroy_private(event);
924 break;
925 default:
926 WARN_ON_ONCE(1);
927 }
928 list_del(&event->list);
929 lttng_destroy_context(event->ctx);
930 kmem_cache_free(event_cache, event);
931 }
932
933 int lttng_session_track_pid(struct lttng_session *session, int pid)
934 {
935 int ret;
936
937 if (pid < -1)
938 return -EINVAL;
939 mutex_lock(&sessions_mutex);
940 if (pid == -1) {
941 /* track all pids: destroy tracker. */
942 if (session->pid_tracker) {
943 struct lttng_pid_tracker *lpf;
944
945 lpf = session->pid_tracker;
946 rcu_assign_pointer(session->pid_tracker, NULL);
947 synchronize_trace();
948 lttng_pid_tracker_destroy(lpf);
949 }
950 ret = 0;
951 } else {
952 if (!session->pid_tracker) {
953 struct lttng_pid_tracker *lpf;
954
955 lpf = lttng_pid_tracker_create();
956 if (!lpf) {
957 ret = -ENOMEM;
958 goto unlock;
959 }
960 ret = lttng_pid_tracker_add(lpf, pid);
961 rcu_assign_pointer(session->pid_tracker, lpf);
962 } else {
963 ret = lttng_pid_tracker_add(session->pid_tracker, pid);
964 }
965 }
966 unlock:
967 mutex_unlock(&sessions_mutex);
968 return ret;
969 }
970
971 int lttng_session_untrack_pid(struct lttng_session *session, int pid)
972 {
973 int ret;
974
975 if (pid < -1)
976 return -EINVAL;
977 mutex_lock(&sessions_mutex);
978 if (pid == -1) {
979 /* untrack all pids: replace by empty tracker. */
980 struct lttng_pid_tracker *old_lpf = session->pid_tracker;
981 struct lttng_pid_tracker *lpf;
982
983 lpf = lttng_pid_tracker_create();
984 if (!lpf) {
985 ret = -ENOMEM;
986 goto unlock;
987 }
988 rcu_assign_pointer(session->pid_tracker, lpf);
989 synchronize_trace();
990 if (old_lpf)
991 lttng_pid_tracker_destroy(old_lpf);
992 ret = 0;
993 } else {
994 if (!session->pid_tracker) {
995 ret = -ENOENT;
996 goto unlock;
997 }
998 ret = lttng_pid_tracker_del(session->pid_tracker, pid);
999 }
1000 unlock:
1001 mutex_unlock(&sessions_mutex);
1002 return ret;
1003 }
1004
1005 static
1006 void *pid_list_start(struct seq_file *m, loff_t *pos)
1007 {
1008 struct lttng_session *session = m->private;
1009 struct lttng_pid_tracker *lpf;
1010 struct lttng_pid_hash_node *e;
1011 int iter = 0, i;
1012
1013 mutex_lock(&sessions_mutex);
1014 lpf = session->pid_tracker;
1015 if (lpf) {
1016 for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) {
1017 struct hlist_head *head = &lpf->pid_hash[i];
1018
1019 lttng_hlist_for_each_entry(e, head, hlist) {
1020 if (iter++ >= *pos)
1021 return e;
1022 }
1023 }
1024 } else {
1025 /* PID tracker disabled. */
1026 if (iter >= *pos && iter == 0) {
1027 return session; /* empty tracker */
1028 }
1029 iter++;
1030 }
1031 /* End of list */
1032 return NULL;
1033 }
1034
1035 /* Called with sessions_mutex held. */
1036 static
1037 void *pid_list_next(struct seq_file *m, void *p, loff_t *ppos)
1038 {
1039 struct lttng_session *session = m->private;
1040 struct lttng_pid_tracker *lpf;
1041 struct lttng_pid_hash_node *e;
1042 int iter = 0, i;
1043
1044 (*ppos)++;
1045 lpf = session->pid_tracker;
1046 if (lpf) {
1047 for (i = 0; i < LTTNG_PID_TABLE_SIZE; i++) {
1048 struct hlist_head *head = &lpf->pid_hash[i];
1049
1050 lttng_hlist_for_each_entry(e, head, hlist) {
1051 if (iter++ >= *ppos)
1052 return e;
1053 }
1054 }
1055 } else {
1056 /* PID tracker disabled. */
1057 if (iter >= *ppos && iter == 0)
1058 return session; /* empty tracker */
1059 iter++;
1060 }
1061
1062 /* End of list */
1063 return NULL;
1064 }
1065
1066 static
1067 void pid_list_stop(struct seq_file *m, void *p)
1068 {
1069 mutex_unlock(&sessions_mutex);
1070 }
1071
1072 static
1073 int pid_list_show(struct seq_file *m, void *p)
1074 {
1075 int pid;
1076
1077 if (p == m->private) {
1078 /* Tracker disabled. */
1079 pid = -1;
1080 } else {
1081 const struct lttng_pid_hash_node *e = p;
1082
1083 pid = lttng_pid_tracker_get_node_pid(e);
1084 }
1085 seq_printf(m, "process { pid = %d; };\n", pid);
1086 return 0;
1087 }
1088
1089 static
1090 const struct seq_operations lttng_tracker_pids_list_seq_ops = {
1091 .start = pid_list_start,
1092 .next = pid_list_next,
1093 .stop = pid_list_stop,
1094 .show = pid_list_show,
1095 };
1096
1097 static
1098 int lttng_tracker_pids_list_open(struct inode *inode, struct file *file)
1099 {
1100 return seq_open(file, &lttng_tracker_pids_list_seq_ops);
1101 }
1102
1103 static
1104 int lttng_tracker_pids_list_release(struct inode *inode, struct file *file)
1105 {
1106 struct seq_file *m = file->private_data;
1107 struct lttng_session *session = m->private;
1108 int ret;
1109
1110 WARN_ON_ONCE(!session);
1111 ret = seq_release(inode, file);
1112 if (!ret && session)
1113 fput(session->file);
1114 return ret;
1115 }
1116
1117 const struct file_operations lttng_tracker_pids_list_fops = {
1118 .owner = THIS_MODULE,
1119 .open = lttng_tracker_pids_list_open,
1120 .read = seq_read,
1121 .llseek = seq_lseek,
1122 .release = lttng_tracker_pids_list_release,
1123 };
1124
1125 int lttng_session_list_tracker_pids(struct lttng_session *session)
1126 {
1127 struct file *tracker_pids_list_file;
1128 struct seq_file *m;
1129 int file_fd, ret;
1130
1131 file_fd = lttng_get_unused_fd();
1132 if (file_fd < 0) {
1133 ret = file_fd;
1134 goto fd_error;
1135 }
1136
1137 tracker_pids_list_file = anon_inode_getfile("[lttng_tracker_pids_list]",
1138 &lttng_tracker_pids_list_fops,
1139 NULL, O_RDWR);
1140 if (IS_ERR(tracker_pids_list_file)) {
1141 ret = PTR_ERR(tracker_pids_list_file);
1142 goto file_error;
1143 }
1144 if (!atomic_long_add_unless(&session->file->f_count, 1, LONG_MAX)) {
1145 ret = -EOVERFLOW;
1146 goto refcount_error;
1147 }
1148 ret = lttng_tracker_pids_list_fops.open(NULL, tracker_pids_list_file);
1149 if (ret < 0)
1150 goto open_error;
1151 m = tracker_pids_list_file->private_data;
1152 m->private = session;
1153 fd_install(file_fd, tracker_pids_list_file);
1154
1155 return file_fd;
1156
1157 open_error:
1158 atomic_long_dec(&session->file->f_count);
1159 refcount_error:
1160 fput(tracker_pids_list_file);
1161 file_error:
1162 put_unused_fd(file_fd);
1163 fd_error:
1164 return ret;
1165 }
1166
1167 /*
1168 * Enabler management.
1169 */
1170 static
1171 int lttng_match_enabler_star_glob(const char *desc_name,
1172 const char *pattern)
1173 {
1174 if (!strutils_star_glob_match(pattern, LTTNG_SIZE_MAX,
1175 desc_name, LTTNG_SIZE_MAX))
1176 return 0;
1177 return 1;
1178 }
1179
1180 static
1181 int lttng_match_enabler_name(const char *desc_name,
1182 const char *name)
1183 {
1184 if (strcmp(desc_name, name))
1185 return 0;
1186 return 1;
1187 }
1188
1189 static
1190 int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
1191 struct lttng_enabler *enabler)
1192 {
1193 const char *desc_name, *enabler_name;
1194
1195 enabler_name = enabler->event_param.name;
1196 switch (enabler->event_param.instrumentation) {
1197 case LTTNG_KERNEL_TRACEPOINT:
1198 desc_name = desc->name;
1199 break;
1200 case LTTNG_KERNEL_SYSCALL:
1201 desc_name = desc->name;
1202 if (!strncmp(desc_name, "compat_", strlen("compat_")))
1203 desc_name += strlen("compat_");
1204 if (!strncmp(desc_name, "syscall_exit_",
1205 strlen("syscall_exit_"))) {
1206 desc_name += strlen("syscall_exit_");
1207 } else if (!strncmp(desc_name, "syscall_entry_",
1208 strlen("syscall_entry_"))) {
1209 desc_name += strlen("syscall_entry_");
1210 } else {
1211 WARN_ON_ONCE(1);
1212 return -EINVAL;
1213 }
1214 break;
1215 default:
1216 WARN_ON_ONCE(1);
1217 return -EINVAL;
1218 }
1219 switch (enabler->type) {
1220 case LTTNG_ENABLER_STAR_GLOB:
1221 return lttng_match_enabler_star_glob(desc_name, enabler_name);
1222 case LTTNG_ENABLER_NAME:
1223 return lttng_match_enabler_name(desc_name, enabler_name);
1224 default:
1225 return -EINVAL;
1226 }
1227 }
1228
1229 static
1230 int lttng_event_match_enabler(struct lttng_event *event,
1231 struct lttng_enabler *enabler)
1232 {
1233 if (enabler->event_param.instrumentation != event->instrumentation)
1234 return 0;
1235 if (lttng_desc_match_enabler(event->desc, enabler)
1236 && event->chan == enabler->chan)
1237 return 1;
1238 else
1239 return 0;
1240 }
1241
1242 static
1243 struct lttng_enabler_ref *lttng_event_enabler_ref(struct lttng_event *event,
1244 struct lttng_enabler *enabler)
1245 {
1246 struct lttng_enabler_ref *enabler_ref;
1247
1248 list_for_each_entry(enabler_ref,
1249 &event->enablers_ref_head, node) {
1250 if (enabler_ref->ref == enabler)
1251 return enabler_ref;
1252 }
1253 return NULL;
1254 }
1255
1256 static
1257 void lttng_create_tracepoint_if_missing(struct lttng_enabler *enabler)
1258 {
1259 struct lttng_session *session = enabler->chan->session;
1260 struct lttng_probe_desc *probe_desc;
1261 const struct lttng_event_desc *desc;
1262 int i;
1263 struct list_head *probe_list;
1264
1265 probe_list = lttng_get_probe_list_head();
1266 /*
1267 * For each probe event, if we find that a probe event matches
1268 * our enabler, create an associated lttng_event if not
1269 * already present.
1270 */
1271 list_for_each_entry(probe_desc, probe_list, head) {
1272 for (i = 0; i < probe_desc->nr_events; i++) {
1273 int found = 0;
1274 struct hlist_head *head;
1275 const char *event_name;
1276 size_t name_len;
1277 uint32_t hash;
1278 struct lttng_event *event;
1279
1280 desc = probe_desc->event_desc[i];
1281 if (!lttng_desc_match_enabler(desc, enabler))
1282 continue;
1283 event_name = desc->name;
1284 name_len = strlen(event_name);
1285
1286 /*
1287 * Check if already created.
1288 */
1289 hash = jhash(event_name, name_len, 0);
1290 head = &session->events_ht.table[hash & (LTTNG_EVENT_HT_SIZE - 1)];
1291 lttng_hlist_for_each_entry(event, head, hlist) {
1292 if (event->desc == desc
1293 && event->chan == enabler->chan)
1294 found = 1;
1295 }
1296 if (found)
1297 continue;
1298
1299 /*
1300 * We need to create an event for this
1301 * event probe.
1302 */
1303 event = _lttng_event_create(enabler->chan,
1304 NULL, NULL, desc,
1305 LTTNG_KERNEL_TRACEPOINT);
1306 if (!event) {
1307 printk(KERN_INFO "Unable to create event %s\n",
1308 probe_desc->event_desc[i]->name);
1309 }
1310 }
1311 }
1312 }
1313
1314 static
1315 void lttng_create_syscall_if_missing(struct lttng_enabler *enabler)
1316 {
1317 int ret;
1318
1319 ret = lttng_syscalls_register(enabler->chan, NULL);
1320 WARN_ON_ONCE(ret);
1321 }
1322
1323 /*
1324 * Create struct lttng_event if it is missing and present in the list of
1325 * tracepoint probes.
1326 * Should be called with sessions mutex held.
1327 */
1328 static
1329 void lttng_create_event_if_missing(struct lttng_enabler *enabler)
1330 {
1331 switch (enabler->event_param.instrumentation) {
1332 case LTTNG_KERNEL_TRACEPOINT:
1333 lttng_create_tracepoint_if_missing(enabler);
1334 break;
1335 case LTTNG_KERNEL_SYSCALL:
1336 lttng_create_syscall_if_missing(enabler);
1337 break;
1338 default:
1339 WARN_ON_ONCE(1);
1340 break;
1341 }
1342 }
1343
1344 /*
1345 * Create events associated with an enabler (if not already present),
1346 * and add backward reference from the event to the enabler.
1347 * Should be called with sessions mutex held.
1348 */
1349 static
1350 int lttng_enabler_ref_events(struct lttng_enabler *enabler)
1351 {
1352 struct lttng_session *session = enabler->chan->session;
1353 struct lttng_event *event;
1354
1355 /* First ensure that probe events are created for this enabler. */
1356 lttng_create_event_if_missing(enabler);
1357
1358 /* For each event matching enabler in session event list. */
1359 list_for_each_entry(event, &session->events, list) {
1360 struct lttng_enabler_ref *enabler_ref;
1361
1362 if (!lttng_event_match_enabler(event, enabler))
1363 continue;
1364 enabler_ref = lttng_event_enabler_ref(event, enabler);
1365 if (!enabler_ref) {
1366 /*
1367 * If no backward ref, create it.
1368 * Add backward ref from event to enabler.
1369 */
1370 enabler_ref = kzalloc(sizeof(*enabler_ref), GFP_KERNEL);
1371 if (!enabler_ref)
1372 return -ENOMEM;
1373 enabler_ref->ref = enabler;
1374 list_add(&enabler_ref->node,
1375 &event->enablers_ref_head);
1376 }
1377
1378 /*
1379 * Link filter bytecodes if not linked yet.
1380 */
1381 lttng_enabler_event_link_bytecode(event, enabler);
1382
1383 /* TODO: merge event context. */
1384 }
1385 return 0;
1386 }
1387
1388 /*
1389 * Called at module load: connect the probe on all enablers matching
1390 * this event.
1391 * Called with sessions lock held.
1392 */
1393 int lttng_fix_pending_events(void)
1394 {
1395 struct lttng_session *session;
1396
1397 list_for_each_entry(session, &sessions, list)
1398 lttng_session_lazy_sync_enablers(session);
1399 return 0;
1400 }
1401
1402 struct lttng_enabler *lttng_enabler_create(enum lttng_enabler_type type,
1403 struct lttng_kernel_event *event_param,
1404 struct lttng_channel *chan)
1405 {
1406 struct lttng_enabler *enabler;
1407
1408 enabler = kzalloc(sizeof(*enabler), GFP_KERNEL);
1409 if (!enabler)
1410 return NULL;
1411 enabler->type = type;
1412 INIT_LIST_HEAD(&enabler->filter_bytecode_head);
1413 memcpy(&enabler->event_param, event_param,
1414 sizeof(enabler->event_param));
1415 enabler->chan = chan;
1416 /* ctx left NULL */
1417 enabler->enabled = 0;
1418 enabler->evtype = LTTNG_TYPE_ENABLER;
1419 mutex_lock(&sessions_mutex);
1420 list_add(&enabler->node, &enabler->chan->session->enablers_head);
1421 lttng_session_lazy_sync_enablers(enabler->chan->session);
1422 mutex_unlock(&sessions_mutex);
1423 return enabler;
1424 }
1425
1426 int lttng_enabler_enable(struct lttng_enabler *enabler)
1427 {
1428 mutex_lock(&sessions_mutex);
1429 enabler->enabled = 1;
1430 lttng_session_lazy_sync_enablers(enabler->chan->session);
1431 mutex_unlock(&sessions_mutex);
1432 return 0;
1433 }
1434
1435 int lttng_enabler_disable(struct lttng_enabler *enabler)
1436 {
1437 mutex_lock(&sessions_mutex);
1438 enabler->enabled = 0;
1439 lttng_session_lazy_sync_enablers(enabler->chan->session);
1440 mutex_unlock(&sessions_mutex);
1441 return 0;
1442 }
1443
1444 int lttng_enabler_attach_bytecode(struct lttng_enabler *enabler,
1445 struct lttng_kernel_filter_bytecode __user *bytecode)
1446 {
1447 struct lttng_filter_bytecode_node *bytecode_node;
1448 uint32_t bytecode_len;
1449 int ret;
1450
1451 ret = get_user(bytecode_len, &bytecode->len);
1452 if (ret)
1453 return ret;
1454 bytecode_node = kzalloc(sizeof(*bytecode_node) + bytecode_len,
1455 GFP_KERNEL);
1456 if (!bytecode_node)
1457 return -ENOMEM;
1458 ret = copy_from_user(&bytecode_node->bc, bytecode,
1459 sizeof(*bytecode) + bytecode_len);
1460 if (ret)
1461 goto error_free;
1462 bytecode_node->enabler = enabler;
1463 /* Enforce length based on allocated size */
1464 bytecode_node->bc.len = bytecode_len;
1465 list_add_tail(&bytecode_node->node, &enabler->filter_bytecode_head);
1466 lttng_session_lazy_sync_enablers(enabler->chan->session);
1467 return 0;
1468
1469 error_free:
1470 kfree(bytecode_node);
1471 return ret;
1472 }
1473
1474 int lttng_event_add_callsite(struct lttng_event *event,
1475 struct lttng_kernel_event_callsite __user *callsite)
1476 {
1477
1478 switch (event->instrumentation) {
1479 case LTTNG_KERNEL_UPROBE:
1480 return lttng_uprobes_add_callsite(event, callsite);
1481 default:
1482 return -EINVAL;
1483 }
1484 }
1485
1486 int lttng_enabler_attach_context(struct lttng_enabler *enabler,
1487 struct lttng_kernel_context *context_param)
1488 {
1489 return -ENOSYS;
1490 }
1491
1492 static
1493 void lttng_enabler_destroy(struct lttng_enabler *enabler)
1494 {
1495 struct lttng_filter_bytecode_node *filter_node, *tmp_filter_node;
1496
1497 /* Destroy filter bytecode */
1498 list_for_each_entry_safe(filter_node, tmp_filter_node,
1499 &enabler->filter_bytecode_head, node) {
1500 kfree(filter_node);
1501 }
1502
1503 /* Destroy contexts */
1504 lttng_destroy_context(enabler->ctx);
1505
1506 list_del(&enabler->node);
1507 kfree(enabler);
1508 }
1509
1510 /*
1511 * lttng_session_sync_enablers should be called just before starting a
1512 * session.
1513 * Should be called with sessions mutex held.
1514 */
1515 static
1516 void lttng_session_sync_enablers(struct lttng_session *session)
1517 {
1518 struct lttng_enabler *enabler;
1519 struct lttng_event *event;
1520
1521 list_for_each_entry(enabler, &session->enablers_head, node)
1522 lttng_enabler_ref_events(enabler);
1523 /*
1524 * For each event, if at least one of its enablers is enabled,
1525 * and its channel and session transient states are enabled, we
1526 * enable the event, else we disable it.
1527 */
1528 list_for_each_entry(event, &session->events, list) {
1529 struct lttng_enabler_ref *enabler_ref;
1530 struct lttng_bytecode_runtime *runtime;
1531 int enabled = 0, has_enablers_without_bytecode = 0;
1532
1533 switch (event->instrumentation) {
1534 case LTTNG_KERNEL_TRACEPOINT:
1535 case LTTNG_KERNEL_SYSCALL:
1536 /* Enable events */
1537 list_for_each_entry(enabler_ref,
1538 &event->enablers_ref_head, node) {
1539 if (enabler_ref->ref->enabled) {
1540 enabled = 1;
1541 break;
1542 }
1543 }
1544 break;
1545 default:
1546 /* Not handled with lazy sync. */
1547 continue;
1548 }
1549 /*
1550 * Enabled state is based on union of enablers, with
1551 * intesection of session and channel transient enable
1552 * states.
1553 */
1554 enabled = enabled && session->tstate && event->chan->tstate;
1555
1556 WRITE_ONCE(event->enabled, enabled);
1557 /*
1558 * Sync tracepoint registration with event enabled
1559 * state.
1560 */
1561 if (enabled) {
1562 register_event(event);
1563 } else {
1564 _lttng_event_unregister(event);
1565 }
1566
1567 /* Check if has enablers without bytecode enabled */
1568 list_for_each_entry(enabler_ref,
1569 &event->enablers_ref_head, node) {
1570 if (enabler_ref->ref->enabled
1571 && list_empty(&enabler_ref->ref->filter_bytecode_head)) {
1572 has_enablers_without_bytecode = 1;
1573 break;
1574 }
1575 }
1576 event->has_enablers_without_bytecode =
1577 has_enablers_without_bytecode;
1578
1579 /* Enable filters */
1580 list_for_each_entry(runtime,
1581 &event->bytecode_runtime_head, node)
1582 lttng_filter_sync_state(runtime);
1583 }
1584 }
1585
1586 /*
1587 * Apply enablers to session events, adding events to session if need
1588 * be. It is required after each modification applied to an active
1589 * session, and right before session "start".
1590 * "lazy" sync means we only sync if required.
1591 * Should be called with sessions mutex held.
1592 */
1593 static
1594 void lttng_session_lazy_sync_enablers(struct lttng_session *session)
1595 {
1596 /* We can skip if session is not active */
1597 if (!session->active)
1598 return;
1599 lttng_session_sync_enablers(session);
1600 }
1601
1602 /*
1603 * Serialize at most one packet worth of metadata into a metadata
1604 * channel.
1605 * We grab the metadata cache mutex to get exclusive access to our metadata
1606 * buffer and to the metadata cache. Exclusive access to the metadata buffer
1607 * allows us to do racy operations such as looking for remaining space left in
1608 * packet and write, since mutual exclusion protects us from concurrent writes.
1609 * Mutual exclusion on the metadata cache allow us to read the cache content
1610 * without racing against reallocation of the cache by updates.
1611 * Returns the number of bytes written in the channel, 0 if no data
1612 * was written and a negative value on error.
1613 */
1614 int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
1615 struct channel *chan)
1616 {
1617 struct lib_ring_buffer_ctx ctx;
1618 int ret = 0;
1619 size_t len, reserve_len;
1620
1621 /*
1622 * Ensure we support mutiple get_next / put sequences followed by
1623 * put_next. The metadata cache lock protects reading the metadata
1624 * cache. It can indeed be read concurrently by "get_next_subbuf" and
1625 * "flush" operations on the buffer invoked by different processes.
1626 * Moreover, since the metadata cache memory can be reallocated, we
1627 * need to have exclusive access against updates even though we only
1628 * read it.
1629 */
1630 mutex_lock(&stream->metadata_cache->lock);
1631 WARN_ON(stream->metadata_in < stream->metadata_out);
1632 if (stream->metadata_in != stream->metadata_out)
1633 goto end;
1634
1635 /* Metadata regenerated, change the version. */
1636 if (stream->metadata_cache->version != stream->version)
1637 stream->version = stream->metadata_cache->version;
1638
1639 len = stream->metadata_cache->metadata_written -
1640 stream->metadata_in;
1641 if (!len)
1642 goto end;
1643 reserve_len = min_t(size_t,
1644 stream->transport->ops.packet_avail_size(chan),
1645 len);
1646 lib_ring_buffer_ctx_init(&ctx, chan, NULL, reserve_len,
1647 sizeof(char), -1);
1648 /*
1649 * If reservation failed, return an error to the caller.
1650 */
1651 ret = stream->transport->ops.event_reserve(&ctx, 0);
1652 if (ret != 0) {
1653 printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
1654 goto end;
1655 }
1656 stream->transport->ops.event_write(&ctx,
1657 stream->metadata_cache->data + stream->metadata_in,
1658 reserve_len);
1659 stream->transport->ops.event_commit(&ctx);
1660 stream->metadata_in += reserve_len;
1661 ret = reserve_len;
1662
1663 end:
1664 mutex_unlock(&stream->metadata_cache->lock);
1665 return ret;
1666 }
1667
1668 /*
1669 * Write the metadata to the metadata cache.
1670 * Must be called with sessions_mutex held.
1671 * The metadata cache lock protects us from concurrent read access from
1672 * thread outputting metadata content to ring buffer.
1673 */
1674 int lttng_metadata_printf(struct lttng_session *session,
1675 const char *fmt, ...)
1676 {
1677 char *str;
1678 size_t len;
1679 va_list ap;
1680 struct lttng_metadata_stream *stream;
1681
1682 WARN_ON_ONCE(!READ_ONCE(session->active));
1683
1684 va_start(ap, fmt);
1685 str = kvasprintf(GFP_KERNEL, fmt, ap);
1686 va_end(ap);
1687 if (!str)
1688 return -ENOMEM;
1689
1690 len = strlen(str);
1691 mutex_lock(&session->metadata_cache->lock);
1692 if (session->metadata_cache->metadata_written + len >
1693 session->metadata_cache->cache_alloc) {
1694 char *tmp_cache_realloc;
1695 unsigned int tmp_cache_alloc_size;
1696
1697 tmp_cache_alloc_size = max_t(unsigned int,
1698 session->metadata_cache->cache_alloc + len,
1699 session->metadata_cache->cache_alloc << 1);
1700 tmp_cache_realloc = vzalloc(tmp_cache_alloc_size);
1701 if (!tmp_cache_realloc)
1702 goto err;
1703 if (session->metadata_cache->data) {
1704 memcpy(tmp_cache_realloc,
1705 session->metadata_cache->data,
1706 session->metadata_cache->cache_alloc);
1707 vfree(session->metadata_cache->data);
1708 }
1709
1710 session->metadata_cache->cache_alloc = tmp_cache_alloc_size;
1711 session->metadata_cache->data = tmp_cache_realloc;
1712 }
1713 memcpy(session->metadata_cache->data +
1714 session->metadata_cache->metadata_written,
1715 str, len);
1716 session->metadata_cache->metadata_written += len;
1717 mutex_unlock(&session->metadata_cache->lock);
1718 kfree(str);
1719
1720 list_for_each_entry(stream, &session->metadata_cache->metadata_stream, list)
1721 wake_up_interruptible(&stream->read_wait);
1722
1723 return 0;
1724
1725 err:
1726 mutex_unlock(&session->metadata_cache->lock);
1727 kfree(str);
1728 return -ENOMEM;
1729 }
1730
1731 static
1732 int print_tabs(struct lttng_session *session, size_t nesting)
1733 {
1734 size_t i;
1735
1736 for (i = 0; i < nesting; i++) {
1737 int ret;
1738
1739 ret = lttng_metadata_printf(session, " ");
1740 if (ret) {
1741 return ret;
1742 }
1743 }
1744 return 0;
1745 }
1746
1747 /*
1748 * Must be called with sessions_mutex held.
1749 */
1750 static
1751 int _lttng_struct_type_statedump(struct lttng_session *session,
1752 const struct lttng_type *type,
1753 size_t nesting)
1754 {
1755 int ret;
1756 uint32_t i, nr_fields;
1757
1758 ret = print_tabs(session, nesting);
1759 if (ret)
1760 return ret;
1761 ret = lttng_metadata_printf(session,
1762 "struct {\n");
1763 if (ret)
1764 return ret;
1765 nr_fields = type->u._struct.nr_fields;
1766 for (i = 0; i < nr_fields; i++) {
1767 const struct lttng_event_field *iter_field;
1768
1769 iter_field = &type->u._struct.fields[i];
1770 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
1771 if (ret)
1772 return ret;
1773 }
1774 ret = print_tabs(session, nesting);
1775 if (ret)
1776 return ret;
1777 ret = lttng_metadata_printf(session,
1778 "}");
1779 return ret;
1780 }
1781
1782 /*
1783 * Must be called with sessions_mutex held.
1784 */
1785 static
1786 int _lttng_struct_statedump(struct lttng_session *session,
1787 const struct lttng_event_field *field,
1788 size_t nesting)
1789 {
1790 int ret;
1791
1792 ret = _lttng_struct_type_statedump(session,
1793 &field->type, nesting);
1794 if (ret)
1795 return ret;
1796 ret = lttng_metadata_printf(session,
1797 "_%s;\n",
1798 field->name);
1799 return ret;
1800 }
1801
1802 /*
1803 * Must be called with sessions_mutex held.
1804 */
1805 static
1806 int _lttng_variant_type_statedump(struct lttng_session *session,
1807 const struct lttng_type *type,
1808 size_t nesting)
1809 {
1810 int ret;
1811 uint32_t i, nr_choices;
1812
1813 ret = print_tabs(session, nesting);
1814 if (ret)
1815 return ret;
1816 ret = lttng_metadata_printf(session,
1817 "variant <_%s> {\n",
1818 type->u.variant.tag_name);
1819 if (ret)
1820 return ret;
1821 nr_choices = type->u.variant.nr_choices;
1822 for (i = 0; i < nr_choices; i++) {
1823 const struct lttng_event_field *iter_field;
1824
1825 iter_field = &type->u.variant.choices[i];
1826 ret = _lttng_field_statedump(session, iter_field, nesting + 1);
1827 if (ret)
1828 return ret;
1829 }
1830 ret = print_tabs(session, nesting);
1831 if (ret)
1832 return ret;
1833 ret = lttng_metadata_printf(session,
1834 "}");
1835 return ret;
1836 }
1837
1838 /*
1839 * Must be called with sessions_mutex held.
1840 */
1841 static
1842 int _lttng_variant_statedump(struct lttng_session *session,
1843 const struct lttng_event_field *field,
1844 size_t nesting)
1845 {
1846 int ret;
1847
1848 ret = _lttng_variant_type_statedump(session,
1849 &field->type, nesting);
1850 if (ret)
1851 return ret;
1852 ret = lttng_metadata_printf(session,
1853 "_%s;\n",
1854 field->name);
1855 return ret;
1856 }
1857
1858 /*
1859 * Must be called with sessions_mutex held.
1860 */
1861 static
1862 int _lttng_array_compound_statedump(struct lttng_session *session,
1863 const struct lttng_event_field *field,
1864 size_t nesting)
1865 {
1866 int ret;
1867 const struct lttng_type *elem_type;
1868
1869 /* Only array of structures and variants are currently supported. */
1870 elem_type = field->type.u.array_compound.elem_type;
1871 switch (elem_type->atype) {
1872 case atype_struct:
1873 ret = _lttng_struct_type_statedump(session, elem_type, nesting);
1874 if (ret)
1875 return ret;
1876 break;
1877 case atype_variant:
1878 ret = _lttng_variant_type_statedump(session, elem_type, nesting);
1879 if (ret)
1880 return ret;
1881 break;
1882 default:
1883 return -EINVAL;
1884 }
1885 ret = lttng_metadata_printf(session,
1886 " _%s[%u];\n",
1887 field->name,
1888 field->type.u.array_compound.length);
1889 return ret;
1890 }
1891
1892 /*
1893 * Must be called with sessions_mutex held.
1894 */
1895 static
1896 int _lttng_sequence_compound_statedump(struct lttng_session *session,
1897 const struct lttng_event_field *field,
1898 size_t nesting)
1899 {
1900 int ret;
1901 const char *length_name;
1902 const struct lttng_type *elem_type;
1903
1904 length_name = field->type.u.sequence_compound.length_name;
1905
1906 /* Only array of structures and variants are currently supported. */
1907 elem_type = field->type.u.sequence_compound.elem_type;
1908 switch (elem_type->atype) {
1909 case atype_struct:
1910 ret = _lttng_struct_type_statedump(session, elem_type, nesting);
1911 if (ret)
1912 return ret;
1913 break;
1914 case atype_variant:
1915 ret = _lttng_variant_type_statedump(session, elem_type, nesting);
1916 if (ret)
1917 return ret;
1918 break;
1919 default:
1920 return -EINVAL;
1921 }
1922 ret = lttng_metadata_printf(session,
1923 " _%s[ _%s ];\n",
1924 field->name,
1925 length_name);
1926 return ret;
1927 }
1928
1929 /*
1930 * Must be called with sessions_mutex held.
1931 */
1932 static
1933 int _lttng_enum_statedump(struct lttng_session *session,
1934 const struct lttng_event_field *field,
1935 size_t nesting)
1936 {
1937 const struct lttng_enum_desc *enum_desc;
1938 const struct lttng_integer_type *container_type;
1939 int ret;
1940 unsigned int i, nr_entries;
1941
1942 enum_desc = field->type.u.basic.enumeration.desc;
1943 container_type = &field->type.u.basic.enumeration.container_type;
1944 nr_entries = enum_desc->nr_entries;
1945
1946 ret = print_tabs(session, nesting);
1947 if (ret)
1948 goto end;
1949 ret = lttng_metadata_printf(session,
1950 "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } {\n",
1951 container_type->size,
1952 container_type->alignment,
1953 container_type->signedness,
1954 (container_type->encoding == lttng_encode_none)
1955 ? "none"
1956 : (container_type->encoding == lttng_encode_UTF8)
1957 ? "UTF8"
1958 : "ASCII",
1959 container_type->base,
1960 #if __BYTE_ORDER == __BIG_ENDIAN
1961 container_type->reverse_byte_order ? " byte_order = le;" : ""
1962 #else
1963 container_type->reverse_byte_order ? " byte_order = be;" : ""
1964 #endif
1965 );
1966 if (ret)
1967 goto end;
1968 /* Dump all entries */
1969 for (i = 0; i < nr_entries; i++) {
1970 const struct lttng_enum_entry *entry = &enum_desc->entries[i];
1971 int j, len;
1972
1973 ret = print_tabs(session, nesting + 1);
1974 if (ret)
1975 goto end;
1976 ret = lttng_metadata_printf(session,
1977 "\"");
1978 if (ret)
1979 goto end;
1980 len = strlen(entry->string);
1981 /* Escape the character '"' */
1982 for (j = 0; j < len; j++) {
1983 char c = entry->string[j];
1984
1985 switch (c) {
1986 case '"':
1987 ret = lttng_metadata_printf(session,
1988 "\\\"");
1989 break;
1990 case '\\':
1991 ret = lttng_metadata_printf(session,
1992 "\\\\");
1993 break;
1994 default:
1995 ret = lttng_metadata_printf(session,
1996 "%c", c);
1997 break;
1998 }
1999 if (ret)
2000 goto end;
2001 }
2002 ret = lttng_metadata_printf(session, "\"");
2003 if (ret)
2004 goto end;
2005
2006 if (entry->options.is_auto) {
2007 ret = lttng_metadata_printf(session, ",\n");
2008 if (ret)
2009 goto end;
2010 } else {
2011 ret = lttng_metadata_printf(session,
2012 " = ");
2013 if (ret)
2014 goto end;
2015 if (entry->start.signedness)
2016 ret = lttng_metadata_printf(session,
2017 "%lld", (long long) entry->start.value);
2018 else
2019 ret = lttng_metadata_printf(session,
2020 "%llu", entry->start.value);
2021 if (ret)
2022 goto end;
2023 if (entry->start.signedness == entry->end.signedness &&
2024 entry->start.value
2025 == entry->end.value) {
2026 ret = lttng_metadata_printf(session,
2027 ",\n");
2028 } else {
2029 if (entry->end.signedness) {
2030 ret = lttng_metadata_printf(session,
2031 " ... %lld,\n",
2032 (long long) entry->end.value);
2033 } else {
2034 ret = lttng_metadata_printf(session,
2035 " ... %llu,\n",
2036 entry->end.value);
2037 }
2038 }
2039 if (ret)
2040 goto end;
2041 }
2042 }
2043 ret = print_tabs(session, nesting);
2044 if (ret)
2045 goto end;
2046 ret = lttng_metadata_printf(session, "} _%s;\n",
2047 field->name);
2048 end:
2049 return ret;
2050 }
2051
2052 /*
2053 * Must be called with sessions_mutex held.
2054 */
2055 static
2056 int _lttng_field_statedump(struct lttng_session *session,
2057 const struct lttng_event_field *field,
2058 size_t nesting)
2059 {
2060 int ret = 0;
2061
2062 switch (field->type.atype) {
2063 case atype_integer:
2064 ret = print_tabs(session, nesting);
2065 if (ret)
2066 return ret;
2067 ret = lttng_metadata_printf(session,
2068 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
2069 field->type.u.basic.integer.size,
2070 field->type.u.basic.integer.alignment,
2071 field->type.u.basic.integer.signedness,
2072 (field->type.u.basic.integer.encoding == lttng_encode_none)
2073 ? "none"
2074 : (field->type.u.basic.integer.encoding == lttng_encode_UTF8)
2075 ? "UTF8"
2076 : "ASCII",
2077 field->type.u.basic.integer.base,
2078 #if __BYTE_ORDER == __BIG_ENDIAN
2079 field->type.u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
2080 #else
2081 field->type.u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
2082 #endif
2083 field->name);
2084 break;
2085 case atype_enum:
2086 ret = _lttng_enum_statedump(session, field, nesting);
2087 break;
2088 case atype_array:
2089 case atype_array_bitfield:
2090 {
2091 const struct lttng_basic_type *elem_type;
2092
2093 elem_type = &field->type.u.array.elem_type;
2094 if (field->type.u.array.elem_alignment) {
2095 ret = print_tabs(session, nesting);
2096 if (ret)
2097 return ret;
2098 ret = lttng_metadata_printf(session,
2099 "struct { } align(%u) _%s_padding;\n",
2100 field->type.u.array.elem_alignment * CHAR_BIT,
2101 field->name);
2102 if (ret)
2103 return ret;
2104 }
2105 ret = print_tabs(session, nesting);
2106 if (ret)
2107 return ret;
2108 ret = lttng_metadata_printf(session,
2109 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
2110 elem_type->u.basic.integer.size,
2111 elem_type->u.basic.integer.alignment,
2112 elem_type->u.basic.integer.signedness,
2113 (elem_type->u.basic.integer.encoding == lttng_encode_none)
2114 ? "none"
2115 : (elem_type->u.basic.integer.encoding == lttng_encode_UTF8)
2116 ? "UTF8"
2117 : "ASCII",
2118 elem_type->u.basic.integer.base,
2119 #if __BYTE_ORDER == __BIG_ENDIAN
2120 elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
2121 #else
2122 elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
2123 #endif
2124 field->name, field->type.u.array.length);
2125 break;
2126 }
2127 case atype_sequence:
2128 case atype_sequence_bitfield:
2129 {
2130 const struct lttng_basic_type *elem_type;
2131 const struct lttng_basic_type *length_type;
2132
2133 elem_type = &field->type.u.sequence.elem_type;
2134 length_type = &field->type.u.sequence.length_type;
2135 ret = print_tabs(session, nesting);
2136 if (ret)
2137 return ret;
2138 ret = lttng_metadata_printf(session,
2139 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
2140 length_type->u.basic.integer.size,
2141 (unsigned int) length_type->u.basic.integer.alignment,
2142 length_type->u.basic.integer.signedness,
2143 (length_type->u.basic.integer.encoding == lttng_encode_none)
2144 ? "none"
2145 : ((length_type->u.basic.integer.encoding == lttng_encode_UTF8)
2146 ? "UTF8"
2147 : "ASCII"),
2148 length_type->u.basic.integer.base,
2149 #if __BYTE_ORDER == __BIG_ENDIAN
2150 length_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
2151 #else
2152 length_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
2153 #endif
2154 field->name);
2155 if (ret)
2156 return ret;
2157
2158 if (field->type.u.sequence.elem_alignment) {
2159 ret = print_tabs(session, nesting);
2160 if (ret)
2161 return ret;
2162 ret = lttng_metadata_printf(session,
2163 "struct { } align(%u) _%s_padding;\n",
2164 field->type.u.sequence.elem_alignment * CHAR_BIT,
2165 field->name);
2166 if (ret)
2167 return ret;
2168 }
2169 ret = print_tabs(session, nesting);
2170 if (ret)
2171 return ret;
2172 ret = lttng_metadata_printf(session,
2173 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
2174 elem_type->u.basic.integer.size,
2175 (unsigned int) elem_type->u.basic.integer.alignment,
2176 elem_type->u.basic.integer.signedness,
2177 (elem_type->u.basic.integer.encoding == lttng_encode_none)
2178 ? "none"
2179 : ((elem_type->u.basic.integer.encoding == lttng_encode_UTF8)
2180 ? "UTF8"
2181 : "ASCII"),
2182 elem_type->u.basic.integer.base,
2183 #if __BYTE_ORDER == __BIG_ENDIAN
2184 elem_type->u.basic.integer.reverse_byte_order ? " byte_order = le;" : "",
2185 #else
2186 elem_type->u.basic.integer.reverse_byte_order ? " byte_order = be;" : "",
2187 #endif
2188 field->name,
2189 field->name);
2190 break;
2191 }
2192
2193 case atype_string:
2194 /* Default encoding is UTF8 */
2195 ret = print_tabs(session, nesting);
2196 if (ret)
2197 return ret;
2198 ret = lttng_metadata_printf(session,
2199 "string%s _%s;\n",
2200 field->type.u.basic.string.encoding == lttng_encode_ASCII ?
2201 " { encoding = ASCII; }" : "",
2202 field->name);
2203 break;
2204 case atype_struct:
2205 ret = _lttng_struct_statedump(session, field, nesting);
2206 break;
2207 case atype_array_compound:
2208 ret = _lttng_array_compound_statedump(session, field, nesting);
2209 break;
2210 case atype_sequence_compound:
2211 ret = _lttng_sequence_compound_statedump(session, field, nesting);
2212 break;
2213 case atype_variant:
2214 ret = _lttng_variant_statedump(session, field, nesting);
2215 break;
2216
2217 default:
2218 WARN_ON_ONCE(1);
2219 return -EINVAL;
2220 }
2221 return ret;
2222 }
2223
2224 static
2225 int _lttng_context_metadata_statedump(struct lttng_session *session,
2226 struct lttng_ctx *ctx)
2227 {
2228 int ret = 0;
2229 int i;
2230
2231 if (!ctx)
2232 return 0;
2233 for (i = 0; i < ctx->nr_fields; i++) {
2234 const struct lttng_ctx_field *field = &ctx->fields[i];
2235
2236 ret = _lttng_field_statedump(session, &field->event_field, 2);
2237 if (ret)
2238 return ret;
2239 }
2240 return ret;
2241 }
2242
2243 static
2244 int _lttng_fields_metadata_statedump(struct lttng_session *session,
2245 struct lttng_event *event)
2246 {
2247 const struct lttng_event_desc *desc = event->desc;
2248 int ret = 0;
2249 int i;
2250
2251 for (i = 0; i < desc->nr_fields; i++) {
2252 const struct lttng_event_field *field = &desc->fields[i];
2253
2254 ret = _lttng_field_statedump(session, field, 2);
2255 if (ret)
2256 return ret;
2257 }
2258 return ret;
2259 }
2260
2261 /*
2262 * Must be called with sessions_mutex held.
2263 */
2264 static
2265 int _lttng_event_metadata_statedump(struct lttng_session *session,
2266 struct lttng_channel *chan,
2267 struct lttng_event *event)
2268 {
2269 int ret = 0;
2270
2271 if (event->metadata_dumped || !READ_ONCE(session->active))
2272 return 0;
2273 if (chan->channel_type == METADATA_CHANNEL)
2274 return 0;
2275
2276 ret = lttng_metadata_printf(session,
2277 "event {\n"
2278 " name = \"%s\";\n"
2279 " id = %u;\n"
2280 " stream_id = %u;\n",
2281 event->desc->name,
2282 event->id,
2283 event->chan->id);
2284 if (ret)
2285 goto end;
2286
2287 if (event->ctx) {
2288 ret = lttng_metadata_printf(session,
2289 " context := struct {\n");
2290 if (ret)
2291 goto end;
2292 }
2293 ret = _lttng_context_metadata_statedump(session, event->ctx);
2294 if (ret)
2295 goto end;
2296 if (event->ctx) {
2297 ret = lttng_metadata_printf(session,
2298 " };\n");
2299 if (ret)
2300 goto end;
2301 }
2302
2303 ret = lttng_metadata_printf(session,
2304 " fields := struct {\n"
2305 );
2306 if (ret)
2307 goto end;
2308
2309 ret = _lttng_fields_metadata_statedump(session, event);
2310 if (ret)
2311 goto end;
2312
2313 /*
2314 * LTTng space reservation can only reserve multiples of the
2315 * byte size.
2316 */
2317 ret = lttng_metadata_printf(session,
2318 " };\n"
2319 "};\n\n");
2320 if (ret)
2321 goto end;
2322
2323 event->metadata_dumped = 1;
2324 end:
2325 return ret;
2326
2327 }
2328
2329 /*
2330 * Must be called with sessions_mutex held.
2331 */
2332 static
2333 int _lttng_channel_metadata_statedump(struct lttng_session *session,
2334 struct lttng_channel *chan)
2335 {
2336 int ret = 0;
2337
2338 if (chan->metadata_dumped || !READ_ONCE(session->active))
2339 return 0;
2340
2341 if (chan->channel_type == METADATA_CHANNEL)
2342 return 0;
2343
2344 WARN_ON_ONCE(!chan->header_type);
2345 ret = lttng_metadata_printf(session,
2346 "stream {\n"
2347 " id = %u;\n"
2348 " event.header := %s;\n"
2349 " packet.context := struct packet_context;\n",
2350 chan->id,
2351 chan->header_type == 1 ? "struct event_header_compact" :
2352 "struct event_header_large");
2353 if (ret)
2354 goto end;
2355
2356 if (chan->ctx) {
2357 ret = lttng_metadata_printf(session,
2358 " event.context := struct {\n");
2359 if (ret)
2360 goto end;
2361 }
2362 ret = _lttng_context_metadata_statedump(session, chan->ctx);
2363 if (ret)
2364 goto end;
2365 if (chan->ctx) {
2366 ret = lttng_metadata_printf(session,
2367 " };\n");
2368 if (ret)
2369 goto end;
2370 }
2371
2372 ret = lttng_metadata_printf(session,
2373 "};\n\n");
2374
2375 chan->metadata_dumped = 1;
2376 end:
2377 return ret;
2378 }
2379
2380 /*
2381 * Must be called with sessions_mutex held.
2382 */
2383 static
2384 int _lttng_stream_packet_context_declare(struct lttng_session *session)
2385 {
2386 return lttng_metadata_printf(session,
2387 "struct packet_context {\n"
2388 " uint64_clock_monotonic_t timestamp_begin;\n"
2389 " uint64_clock_monotonic_t timestamp_end;\n"
2390 " uint64_t content_size;\n"
2391 " uint64_t packet_size;\n"
2392 " uint64_t packet_seq_num;\n"
2393 " unsigned long events_discarded;\n"
2394 " uint32_t cpu_id;\n"
2395 "};\n\n"
2396 );
2397 }
2398
2399 /*
2400 * Compact header:
2401 * id: range: 0 - 30.
2402 * id 31 is reserved to indicate an extended header.
2403 *
2404 * Large header:
2405 * id: range: 0 - 65534.
2406 * id 65535 is reserved to indicate an extended header.
2407 *
2408 * Must be called with sessions_mutex held.
2409 */
2410 static
2411 int _lttng_event_header_declare(struct lttng_session *session)
2412 {
2413 return lttng_metadata_printf(session,
2414 "struct event_header_compact {\n"
2415 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
2416 " variant <id> {\n"
2417 " struct {\n"
2418 " uint27_clock_monotonic_t timestamp;\n"
2419 " } compact;\n"
2420 " struct {\n"
2421 " uint32_t id;\n"
2422 " uint64_clock_monotonic_t timestamp;\n"
2423 " } extended;\n"
2424 " } v;\n"
2425 "} align(%u);\n"
2426 "\n"
2427 "struct event_header_large {\n"
2428 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
2429 " variant <id> {\n"
2430 " struct {\n"
2431 " uint32_clock_monotonic_t timestamp;\n"
2432 " } compact;\n"
2433 " struct {\n"
2434 " uint32_t id;\n"
2435 " uint64_clock_monotonic_t timestamp;\n"
2436 " } extended;\n"
2437 " } v;\n"
2438 "} align(%u);\n\n",
2439 lttng_alignof(uint32_t) * CHAR_BIT,
2440 lttng_alignof(uint16_t) * CHAR_BIT
2441 );
2442 }
2443
2444 /*
2445 * Approximation of NTP time of day to clock monotonic correlation,
2446 * taken at start of trace.
2447 * Yes, this is only an approximation. Yes, we can (and will) do better
2448 * in future versions.
2449 * This function may return a negative offset. It may happen if the
2450 * system sets the REALTIME clock to 0 after boot.
2451 */
2452 static
2453 int64_t measure_clock_offset(void)
2454 {
2455 uint64_t monotonic_avg, monotonic[2], realtime;
2456 uint64_t tcf = trace_clock_freq();
2457 int64_t offset;
2458 struct timespec rts = { 0, 0 };
2459 unsigned long flags;
2460
2461 /* Disable interrupts to increase correlation precision. */
2462 local_irq_save(flags);
2463 monotonic[0] = trace_clock_read64();
2464 getnstimeofday(&rts);
2465 monotonic[1] = trace_clock_read64();
2466 local_irq_restore(flags);
2467
2468 monotonic_avg = (monotonic[0] + monotonic[1]) >> 1;
2469 realtime = (uint64_t) rts.tv_sec * tcf;
2470 if (tcf == NSEC_PER_SEC) {
2471 realtime += rts.tv_nsec;
2472 } else {
2473 uint64_t n = rts.tv_nsec * tcf;
2474
2475 do_div(n, NSEC_PER_SEC);
2476 realtime += n;
2477 }
2478 offset = (int64_t) realtime - monotonic_avg;
2479 return offset;
2480 }
2481
2482 static
2483 int print_escaped_ctf_string(struct lttng_session *session, const char *string)
2484 {
2485 int ret;
2486 size_t i;
2487 char cur;
2488
2489 i = 0;
2490 cur = string[i];
2491 while (cur != '\0') {
2492 switch (cur) {
2493 case '\n':
2494 ret = lttng_metadata_printf(session, "%s", "\\n");
2495 break;
2496 case '\\':
2497 case '"':
2498 ret = lttng_metadata_printf(session, "%c", '\\');
2499 if (ret)
2500 goto error;
2501 /* We still print the current char */
2502 /* Fallthrough */
2503 default:
2504 ret = lttng_metadata_printf(session, "%c", cur);
2505 break;
2506 }
2507
2508 if (ret)
2509 goto error;
2510
2511 cur = string[++i];
2512 }
2513 error:
2514 return ret;
2515 }
2516
2517 static
2518 int print_metadata_escaped_field(struct lttng_session *session, const char *field,
2519 const char *field_value)
2520 {
2521 int ret;
2522
2523 ret = lttng_metadata_printf(session, " %s = \"", field);
2524 if (ret)
2525 goto error;
2526
2527 ret = print_escaped_ctf_string(session, field_value);
2528 if (ret)
2529 goto error;
2530
2531 ret = lttng_metadata_printf(session, "\";\n");
2532
2533 error:
2534 return ret;
2535 }
2536
2537 /*
2538 * Output metadata into this session's metadata buffers.
2539 * Must be called with sessions_mutex held.
2540 */
2541 static
2542 int _lttng_session_metadata_statedump(struct lttng_session *session)
2543 {
2544 unsigned char *uuid_c = session->uuid.b;
2545 unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN];
2546 const char *product_uuid;
2547 struct lttng_channel *chan;
2548 struct lttng_event *event;
2549 int ret = 0;
2550
2551 if (!READ_ONCE(session->active))
2552 return 0;
2553 if (session->metadata_dumped)
2554 goto skip_session;
2555
2556 snprintf(uuid_s, sizeof(uuid_s),
2557 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
2558 uuid_c[0], uuid_c[1], uuid_c[2], uuid_c[3],
2559 uuid_c[4], uuid_c[5], uuid_c[6], uuid_c[7],
2560 uuid_c[8], uuid_c[9], uuid_c[10], uuid_c[11],
2561 uuid_c[12], uuid_c[13], uuid_c[14], uuid_c[15]);
2562
2563 ret = lttng_metadata_printf(session,
2564 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
2565 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
2566 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
2567 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
2568 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
2569 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
2570 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
2571 "\n"
2572 "trace {\n"
2573 " major = %u;\n"
2574 " minor = %u;\n"
2575 " uuid = \"%s\";\n"
2576 " byte_order = %s;\n"
2577 " packet.header := struct {\n"
2578 " uint32_t magic;\n"
2579 " uint8_t uuid[16];\n"
2580 " uint32_t stream_id;\n"
2581 " uint64_t stream_instance_id;\n"
2582 " };\n"
2583 "};\n\n",
2584 lttng_alignof(uint8_t) * CHAR_BIT,
2585 lttng_alignof(uint16_t) * CHAR_BIT,
2586 lttng_alignof(uint32_t) * CHAR_BIT,
2587 lttng_alignof(uint64_t) * CHAR_BIT,
2588 sizeof(unsigned long) * CHAR_BIT,
2589 lttng_alignof(unsigned long) * CHAR_BIT,
2590 CTF_SPEC_MAJOR,
2591 CTF_SPEC_MINOR,
2592 uuid_s,
2593 #if __BYTE_ORDER == __BIG_ENDIAN
2594 "be"
2595 #else
2596 "le"
2597 #endif
2598 );
2599 if (ret)
2600 goto end;
2601
2602 ret = lttng_metadata_printf(session,
2603 "env {\n"
2604 " hostname = \"%s\";\n"
2605 " domain = \"kernel\";\n"
2606 " sysname = \"%s\";\n"
2607 " kernel_release = \"%s\";\n"
2608 " kernel_version = \"%s\";\n"
2609 " tracer_name = \"lttng-modules\";\n"
2610 " tracer_major = %d;\n"
2611 " tracer_minor = %d;\n"
2612 " tracer_patchlevel = %d;\n"
2613 " trace_buffering_scheme = \"global\";\n",
2614 current->nsproxy->uts_ns->name.nodename,
2615 utsname()->sysname,
2616 utsname()->release,
2617 utsname()->version,
2618 LTTNG_MODULES_MAJOR_VERSION,
2619 LTTNG_MODULES_MINOR_VERSION,
2620 LTTNG_MODULES_PATCHLEVEL_VERSION
2621 );
2622 if (ret)
2623 goto end;
2624
2625 ret = print_metadata_escaped_field(session, "trace_name", session->name);
2626 if (ret)
2627 goto end;
2628 ret = print_metadata_escaped_field(session, "trace_creation_datetime",
2629 session->creation_time);
2630 if (ret)
2631 goto end;
2632
2633 /* Add the product UUID to the 'env' section */
2634 product_uuid = dmi_get_system_info(DMI_PRODUCT_UUID);
2635 if (product_uuid) {
2636 ret = lttng_metadata_printf(session,
2637 " product_uuid = \"%s\";\n",
2638 product_uuid
2639 );
2640 if (ret)
2641 goto end;
2642 }
2643
2644 /* Close the 'env' section */
2645 ret = lttng_metadata_printf(session, "};\n\n");
2646 if (ret)
2647 goto end;
2648
2649 ret = lttng_metadata_printf(session,
2650 "clock {\n"
2651 " name = \"%s\";\n",
2652 trace_clock_name()
2653 );
2654 if (ret)
2655 goto end;
2656
2657 if (!trace_clock_uuid(clock_uuid_s)) {
2658 ret = lttng_metadata_printf(session,
2659 " uuid = \"%s\";\n",
2660 clock_uuid_s
2661 );
2662 if (ret)
2663 goto end;
2664 }
2665
2666 ret = lttng_metadata_printf(session,
2667 " description = \"%s\";\n"
2668 " freq = %llu; /* Frequency, in Hz */\n"
2669 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
2670 " offset = %lld;\n"
2671 "};\n\n",
2672 trace_clock_description(),
2673 (unsigned long long) trace_clock_freq(),
2674 (long long) measure_clock_offset()
2675 );
2676 if (ret)
2677 goto end;
2678
2679 ret = lttng_metadata_printf(session,
2680 "typealias integer {\n"
2681 " size = 27; align = 1; signed = false;\n"
2682 " map = clock.%s.value;\n"
2683 "} := uint27_clock_monotonic_t;\n"
2684 "\n"
2685 "typealias integer {\n"
2686 " size = 32; align = %u; signed = false;\n"
2687 " map = clock.%s.value;\n"
2688 "} := uint32_clock_monotonic_t;\n"
2689 "\n"
2690 "typealias integer {\n"
2691 " size = 64; align = %u; signed = false;\n"
2692 " map = clock.%s.value;\n"
2693 "} := uint64_clock_monotonic_t;\n\n",
2694 trace_clock_name(),
2695 lttng_alignof(uint32_t) * CHAR_BIT,
2696 trace_clock_name(),
2697 lttng_alignof(uint64_t) * CHAR_BIT,
2698 trace_clock_name()
2699 );
2700 if (ret)
2701 goto end;
2702
2703 ret = _lttng_stream_packet_context_declare(session);
2704 if (ret)
2705 goto end;
2706
2707 ret = _lttng_event_header_declare(session);
2708 if (ret)
2709 goto end;
2710
2711 skip_session:
2712 list_for_each_entry(chan, &session->chan, list) {
2713 ret = _lttng_channel_metadata_statedump(session, chan);
2714 if (ret)
2715 goto end;
2716 }
2717
2718 list_for_each_entry(event, &session->events, list) {
2719 ret = _lttng_event_metadata_statedump(session, event->chan, event);
2720 if (ret)
2721 goto end;
2722 }
2723 session->metadata_dumped = 1;
2724 end:
2725 return ret;
2726 }
2727
2728 /**
2729 * lttng_transport_register - LTT transport registration
2730 * @transport: transport structure
2731 *
2732 * Registers a transport which can be used as output to extract the data out of
2733 * LTTng. The module calling this registration function must ensure that no
2734 * trap-inducing code will be executed by the transport functions. E.g.
2735 * vmalloc_sync_all() must be called between a vmalloc and the moment the memory
2736 * is made visible to the transport function. This registration acts as a
2737 * vmalloc_sync_all. Therefore, only if the module allocates virtual memory
2738 * after its registration must it synchronize the TLBs.
2739 */
2740 void lttng_transport_register(struct lttng_transport *transport)
2741 {
2742 /*
2743 * Make sure no page fault can be triggered by the module about to be
2744 * registered. We deal with this here so we don't have to call
2745 * vmalloc_sync_all() in each module's init.
2746 */
2747 wrapper_vmalloc_sync_all();
2748
2749 mutex_lock(&sessions_mutex);
2750 list_add_tail(&transport->node, &lttng_transport_list);
2751 mutex_unlock(&sessions_mutex);
2752 }
2753 EXPORT_SYMBOL_GPL(lttng_transport_register);
2754
2755 /**
2756 * lttng_transport_unregister - LTT transport unregistration
2757 * @transport: transport structure
2758 */
2759 void lttng_transport_unregister(struct lttng_transport *transport)
2760 {
2761 mutex_lock(&sessions_mutex);
2762 list_del(&transport->node);
2763 mutex_unlock(&sessions_mutex);
2764 }
2765 EXPORT_SYMBOL_GPL(lttng_transport_unregister);
2766
2767 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
2768
2769 enum cpuhp_state lttng_hp_prepare;
2770 enum cpuhp_state lttng_hp_online;
2771
2772 static int lttng_hotplug_prepare(unsigned int cpu, struct hlist_node *node)
2773 {
2774 struct lttng_cpuhp_node *lttng_node;
2775
2776 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2777 switch (lttng_node->component) {
2778 case LTTNG_RING_BUFFER_FRONTEND:
2779 return 0;
2780 case LTTNG_RING_BUFFER_BACKEND:
2781 return lttng_cpuhp_rb_backend_prepare(cpu, lttng_node);
2782 case LTTNG_RING_BUFFER_ITER:
2783 return 0;
2784 case LTTNG_CONTEXT_PERF_COUNTERS:
2785 return 0;
2786 default:
2787 return -EINVAL;
2788 }
2789 }
2790
2791 static int lttng_hotplug_dead(unsigned int cpu, struct hlist_node *node)
2792 {
2793 struct lttng_cpuhp_node *lttng_node;
2794
2795 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2796 switch (lttng_node->component) {
2797 case LTTNG_RING_BUFFER_FRONTEND:
2798 return lttng_cpuhp_rb_frontend_dead(cpu, lttng_node);
2799 case LTTNG_RING_BUFFER_BACKEND:
2800 return 0;
2801 case LTTNG_RING_BUFFER_ITER:
2802 return 0;
2803 case LTTNG_CONTEXT_PERF_COUNTERS:
2804 return lttng_cpuhp_perf_counter_dead(cpu, lttng_node);
2805 default:
2806 return -EINVAL;
2807 }
2808 }
2809
2810 static int lttng_hotplug_online(unsigned int cpu, struct hlist_node *node)
2811 {
2812 struct lttng_cpuhp_node *lttng_node;
2813
2814 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2815 switch (lttng_node->component) {
2816 case LTTNG_RING_BUFFER_FRONTEND:
2817 return lttng_cpuhp_rb_frontend_online(cpu, lttng_node);
2818 case LTTNG_RING_BUFFER_BACKEND:
2819 return 0;
2820 case LTTNG_RING_BUFFER_ITER:
2821 return lttng_cpuhp_rb_iter_online(cpu, lttng_node);
2822 case LTTNG_CONTEXT_PERF_COUNTERS:
2823 return lttng_cpuhp_perf_counter_online(cpu, lttng_node);
2824 default:
2825 return -EINVAL;
2826 }
2827 }
2828
2829 static int lttng_hotplug_offline(unsigned int cpu, struct hlist_node *node)
2830 {
2831 struct lttng_cpuhp_node *lttng_node;
2832
2833 lttng_node = container_of(node, struct lttng_cpuhp_node, node);
2834 switch (lttng_node->component) {
2835 case LTTNG_RING_BUFFER_FRONTEND:
2836 return lttng_cpuhp_rb_frontend_offline(cpu, lttng_node);
2837 case LTTNG_RING_BUFFER_BACKEND:
2838 return 0;
2839 case LTTNG_RING_BUFFER_ITER:
2840 return 0;
2841 case LTTNG_CONTEXT_PERF_COUNTERS:
2842 return 0;
2843 default:
2844 return -EINVAL;
2845 }
2846 }
2847
2848 static int __init lttng_init_cpu_hotplug(void)
2849 {
2850 int ret;
2851
2852 ret = cpuhp_setup_state_multi(CPUHP_BP_PREPARE_DYN, "lttng:prepare",
2853 lttng_hotplug_prepare,
2854 lttng_hotplug_dead);
2855 if (ret < 0) {
2856 return ret;
2857 }
2858 lttng_hp_prepare = ret;
2859 lttng_rb_set_hp_prepare(ret);
2860
2861 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "lttng:online",
2862 lttng_hotplug_online,
2863 lttng_hotplug_offline);
2864 if (ret < 0) {
2865 cpuhp_remove_multi_state(lttng_hp_prepare);
2866 lttng_hp_prepare = 0;
2867 return ret;
2868 }
2869 lttng_hp_online = ret;
2870 lttng_rb_set_hp_online(ret);
2871
2872 return 0;
2873 }
2874
2875 static void __exit lttng_exit_cpu_hotplug(void)
2876 {
2877 lttng_rb_set_hp_online(0);
2878 cpuhp_remove_multi_state(lttng_hp_online);
2879 lttng_rb_set_hp_prepare(0);
2880 cpuhp_remove_multi_state(lttng_hp_prepare);
2881 }
2882
2883 #else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2884 static int lttng_init_cpu_hotplug(void)
2885 {
2886 return 0;
2887 }
2888 static void lttng_exit_cpu_hotplug(void)
2889 {
2890 }
2891 #endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0)) */
2892
2893
2894 static int __init lttng_events_init(void)
2895 {
2896 int ret;
2897
2898 ret = wrapper_lttng_fixup_sig(THIS_MODULE);
2899 if (ret)
2900 return ret;
2901 ret = wrapper_get_pfnblock_flags_mask_init();
2902 if (ret)
2903 return ret;
2904 ret = wrapper_get_pageblock_flags_mask_init();
2905 if (ret)
2906 return ret;
2907 ret = lttng_probes_init();
2908 if (ret)
2909 return ret;
2910 ret = lttng_context_init();
2911 if (ret)
2912 return ret;
2913 ret = lttng_tracepoint_init();
2914 if (ret)
2915 goto error_tp;
2916 event_cache = KMEM_CACHE(lttng_event, 0);
2917 if (!event_cache) {
2918 ret = -ENOMEM;
2919 goto error_kmem;
2920 }
2921 ret = lttng_abi_init();
2922 if (ret)
2923 goto error_abi;
2924 ret = lttng_logger_init();
2925 if (ret)
2926 goto error_logger;
2927 ret = lttng_init_cpu_hotplug();
2928 if (ret)
2929 goto error_hotplug;
2930 printk(KERN_NOTICE "LTTng: Loaded modules v%s.%s.%s%s (%s)%s%s\n",
2931 __stringify(LTTNG_MODULES_MAJOR_VERSION),
2932 __stringify(LTTNG_MODULES_MINOR_VERSION),
2933 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
2934 LTTNG_MODULES_EXTRAVERSION,
2935 LTTNG_VERSION_NAME,
2936 #ifdef LTTNG_EXTRA_VERSION_GIT
2937 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
2938 #else
2939 "",
2940 #endif
2941 #ifdef LTTNG_EXTRA_VERSION_NAME
2942 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
2943 #else
2944 "");
2945 #endif
2946 return 0;
2947
2948 error_hotplug:
2949 lttng_logger_exit();
2950 error_logger:
2951 lttng_abi_exit();
2952 error_abi:
2953 kmem_cache_destroy(event_cache);
2954 error_kmem:
2955 lttng_tracepoint_exit();
2956 error_tp:
2957 lttng_context_exit();
2958 printk(KERN_NOTICE "LTTng: Failed to load modules v%s.%s.%s%s (%s)%s%s\n",
2959 __stringify(LTTNG_MODULES_MAJOR_VERSION),
2960 __stringify(LTTNG_MODULES_MINOR_VERSION),
2961 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
2962 LTTNG_MODULES_EXTRAVERSION,
2963 LTTNG_VERSION_NAME,
2964 #ifdef LTTNG_EXTRA_VERSION_GIT
2965 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
2966 #else
2967 "",
2968 #endif
2969 #ifdef LTTNG_EXTRA_VERSION_NAME
2970 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
2971 #else
2972 "");
2973 #endif
2974 return ret;
2975 }
2976
2977 module_init(lttng_events_init);
2978
2979 static void __exit lttng_events_exit(void)
2980 {
2981 struct lttng_session *session, *tmpsession;
2982
2983 lttng_exit_cpu_hotplug();
2984 lttng_logger_exit();
2985 lttng_abi_exit();
2986 list_for_each_entry_safe(session, tmpsession, &sessions, list)
2987 lttng_session_destroy(session);
2988 kmem_cache_destroy(event_cache);
2989 lttng_tracepoint_exit();
2990 lttng_context_exit();
2991 printk(KERN_NOTICE "LTTng: Unloaded modules v%s.%s.%s%s (%s)%s%s\n",
2992 __stringify(LTTNG_MODULES_MAJOR_VERSION),
2993 __stringify(LTTNG_MODULES_MINOR_VERSION),
2994 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION),
2995 LTTNG_MODULES_EXTRAVERSION,
2996 LTTNG_VERSION_NAME,
2997 #ifdef LTTNG_EXTRA_VERSION_GIT
2998 LTTNG_EXTRA_VERSION_GIT[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_GIT,
2999 #else
3000 "",
3001 #endif
3002 #ifdef LTTNG_EXTRA_VERSION_NAME
3003 LTTNG_EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " LTTNG_EXTRA_VERSION_NAME);
3004 #else
3005 "");
3006 #endif
3007 }
3008
3009 module_exit(lttng_events_exit);
3010
3011 #include "extra_version/patches.i"
3012 #ifdef LTTNG_EXTRA_VERSION_GIT
3013 MODULE_INFO(extra_version_git, LTTNG_EXTRA_VERSION_GIT);
3014 #endif
3015 #ifdef LTTNG_EXTRA_VERSION_NAME
3016 MODULE_INFO(extra_version_name, LTTNG_EXTRA_VERSION_NAME);
3017 #endif
3018 MODULE_LICENSE("GPL and additional rights");
3019 MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
3020 MODULE_DESCRIPTION("LTTng tracer");
3021 MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
3022 __stringify(LTTNG_MODULES_MINOR_VERSION) "."
3023 __stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
3024 LTTNG_MODULES_EXTRAVERSION);
LTTng 2.0/0.x modules
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